Patent Description:
Welding, also known as fusion welding, is a manufacturing process and technology for bonding metals or other thermoplastic materials (such as plastics) by heating, high temperature or high pressure. At present, the equipment used for welding is mostly equipped with a welding base and a welding head, where the welding base is used to bear two objects to be welded together, and the welding head is used to weld the two objects to be welded together.

When the welding device is in use, it is necessary to move the welding head and welding base first to adjust the positions of them, so as to facilitate the subsequent welding. However, the existing welding device cannot ensure that the welding head and the welding base can be moved simultaneously.

A bagged spring welding device is known from <CIT>, on which the preamble of claim <NUM> is based. The device comprises a machine frame, wherein a first sliding frame is arranged on the machine frame in a sliding mode, a second sliding frame is arranged on the first sliding frame in a sliding mode, a first welding block is fixedly arranged on the first sliding frame and a power mechanism drives a sliding block slidably arranged on the machine frame to move in a reciprocating mode through a crank sliding block mechanism.

The present application aims at solving at least one of the technical problems existing in the prior art. To this end, it is an object of the present application to propose a welding device to solve the problem that the welding head and the welding base cannot move synchronously.

According to the present invention, the present application provide a welding device, which includes a drive unit, a first connecting rod, a second connecting rod, a welding head and a welding base. The drive unit is in driving connection with one end of the first connecting rod and one end of the second connecting rod; another end of the first connecting rod is in driving connection with the welding head, and is configured for causing, being driven by the drive unit, the welding head to move in a direction close to or away from the welding base; and another end of the second connecting rod is in driving connection with the welding base, and is configured for causing, being driven by the drive unit, the welding base to move in a direction close to or away from the welding head.

In the technical solution of the embodiments of the present application, the drive unit is in driving connection with one end of the first connecting rod and one end of the second connecting rod; another end of the first connecting rod is in driving connection with the welding head, and is configured for causing, being driven by the drive unit, the welding head to move in a direction close to or away from the welding base; and another end of the second connecting rod is in driving connection with the welding base, and is configured for causing, being driven by the drive unit, the welding base to move in a direction close to or away from the welding head. With such a design, when the welding device is in use, and it is necessary to move the welding head and the welding base at the same time, the drive unit can drive the first connecting rod and the second connecting rod to move simultaneously, so that the first connecting rod drives the welding head to move in the direction close to or away from the welding base, and the second connecting rod drives the welding base to move in the direction close to or away from the welding head, thereby ensuring the simultaneous movement of the welding head and the welding base.

In some embodiments, the welding device further includes a shaping plate; the shaping plate is in driving connection with the another end of the first connecting rod; and the first connecting rod, being driven by the drive unit, drives the welding head and the shaping plate to move. In this way, the drive unit can drive the shaping plate at the same time as it drives the first connecting rod to move the welding head, thus eliminating the need to additionally drive the shaping plate through other parts to save the steps.

In some embodiments, the welding device further includes a first fixing component; and the first fixing component is connected with the another end of the first connecting rod, the welding head and the shaping plate, and the shaping plate and the first fixing component are provided with spacing, the spacing being increased or decreased. In this way, during the process of moving the welding head and the shaping plate simultaneously and using the shaping plate for shaping, the spacing can be reduced to avoid the shaping plate exerting too much pressure on the object to be shaped during shaping and causing damage to the object to be shaped.

In some embodiments, the welding device further includes an elastic member; the elastic member is located between the first fixing component and the shaping plate; and when the spacing is decreased, the elastic member is elastically deformed under extrusion of the first fixing component and the shaping plate.

According to the invention, the welding device further includes two cams and at least one output shaft being in driving connection with the drive unit and mated with the two cams; and the one end of the first connecting rod and one end of the second connecting rod are connected with one of the two cams. In this way, the drive unit can drive two cams through at least one output shaft to move the first connecting rod and the second connecting rod, thereby moving the welding head and the welding base.

According to the invention, one output shaft is provided, and the output shaft penetrates through and are fixed to the two cams.

According to the invention, the welding device further includes a first stationary shaft and two drive rods; the first stationary shaft is axially parallel to the output shaft; the two drive rods are rotatably disposed on the first stationary shaft in a circumferential direction of the first stationary shaft; the two drive rods each include a connecting part and a drive part, and two drive parts are respectively in driving connection with one of the two cams; and one end of the first connecting rod and one end of the second connecting rod are in driving connection with one connecting part. In this way, when the drive unit drives the output shaft and brings the two cams to rotate, each cam can drive a drive rod to rotate circumferentially along the first stationary shaft via a drive part, so as to drive one of the first connecting rod and the second connecting rod to move respectively via two drive rods, and then bring the welding head and the welding base to move.

In some embodiments, the welding device further includes a first fixing component connected with the another end of the first connecting rod and the welding head; and a second fixing component connected with the another end of the second connecting rod and the welding base. In this way, when the drive unit drives the first fixing component to move via the first connecting rod, the welding head can be moved, and when the drive unit drives the second fixing component to move via the second connecting rod, the welding base can be moved.

In some embodiments, the welding device further includes a first supporting component; when the welding head moves in a direction close to the welding base, the first support component moves to a preset position and abuts against the first fixing component to prevent the welding head from moving in a direction away from the welding base. In this way, after the drive unit drives the first fixing component to move via the first connecting rod, so as to bring the welding head to move, the welding head can be prevented from moving in the direction away from the welding base by the first supporting component, so as to improve the stability of the welding head while welding.

In some embodiments, the welding device further includes a third connecting rod; and the third connecting rod is in driving connection with the drive unit and the first supporting component, and is configured for causing, being driven by the drive unit, the first supporting component to move. In this way, the drive unit can drive the second fixing component to move via the third connecting rod while driving the first fixing component to move via the first connecting rod, so as to bring the welding head to move.

In some embodiments, the welding device further includes a positioning bracket fixed to the drive unit; the first supporting component includes: a first guide rail fixed on the positioning bracket, and a first supporting piece slidably arranged on the first guide rail and in driving connection with an end portion of the third connecting rod; and the third connecting rod is configured for driving the first supporting piece to slide on the first guide rail and bringing the first supporting piece against the first fixing component. In this way, the drive unit can drive the first supporting piece to slide on the first guide rail via the third connecting rod, and when the drive unit moves the first fixing component via the first connecting rod to move the welding head, the first supporting component is made to abut against the first fixing component to prevent the welding head from moving in the direction away from the welding base, thereby improving the stability of the welding head and the shaping plate when the welding head is being welded.

In some embodiments, the first supporting component further includes: a second stationary shaft fixed on the positioning bracket; and an articulated connecting rod rotatably disposed on the second stationary shaft in a circumferential direction of the second stationary shaft, and opposite ends of the articulated connecting rod being respectively connected with one of the third connecting rod and the first supporting piece. In this way, the drive unit can drive the articulated connecting rod through the third connecting rod to rotate circumferentially along the second stationary shaft to slide the first supporting piece on the first guide rail through the articulated connecting rod, so that the first supporting piece can abut the first fixing component and prevent the welding head from moving in the direction away from the welding base.

In some embodiments, the welding device further includes a second supporting component; when the welding base moves in a direction close to the welding head, the second supporting component moves to a preset position and abuts against the second fixing component to prevent the welding base from moving in a direction away from the welding head. In this way, after the drive unit drives the second fixing component to move via the second connecting rod, so as to bring the welding base to move, the welding base can be prevented from moving in the direction away from the welding head by the second supporting component, so as to improve the stability of the welding base while the welding heat is being welded.

In some embodiments, the welding device further includes a fourth connecting rod; the fourth connecting rod is in driving connection with the drive unit and the second supporting component, and is configured for causing, being driven by the drive unit, the second supporting component to move. In this way, the drive unit can drive the second fixing component to move via the fourth connecting rod while driving the second fixing component to move via the second connecting rod so as to bring the welding base to move.

In some embodiments, the welding device further includes a positioning bracket fixed to the drive unit; the second supporting component includes: a second guide rail fixed on the positioning bracket, and a second supporting piece slidably arranged on the second guide rail and in driving connection with an end portion of the fourth connecting rod; and the fourth connecting rod is configured for driving the second supporting piece to slide on the second guide rail and bringing the second supporting piece against the second fixing component. In this way, the drive unit can drive the second supporting component to slide on the second guide rail via the fourth connecting rod, and when the drive unit moves the second fixing component via the second connecting rod to move the welding base, the second supporting component is made to abut against the second fixing component to prevent the welding base from moving in the direction away from the welding head, thereby improving the stability of the welding base when the welding head is being welded.

In some embodiments, the second supporting component further includes a first staging connecting rod, a second staging connecting rod, and a drive shaft; the second supporting piece is provided with a third guide rail, and an extension direction of the third guide rail intersects with an extension direction of the second guide rail; one end of the first staging connecting rod and one end of the second staging connecting rod are fixed with the drive shaft, another end of the first staging connecting rod is in driving connection with an end portion of the fourth connecting rod, and another end of the second staging connecting rod is slidably arranged on the third guide rail; and the drive shaft is rotatably arranged on the positioning bracket in a circumferential direction of the positioning bracket. In this way, the drive unit can drive the first staging connecting rod to rotate circumferentially along the drive shaft via the fourth connecting rod, and drive the second staging connecting rod via the drive shaft to rotate circumferentially along the drive shaft, and slide on third guide rail by means of the other end of the second staging connecting rod, causing the second supporting piece to slide on the second guide rail, thereby allowing the second supporting piece to abut the second fixing component and preventing the welding base from moving in a direction away from the welding head.

In some embodiments, the welding device further includes a cylinder coupled to the welding head and configured for driving the welding head to move in a direction close to or away from the welding base; and the another end of the first connecting rod is in driving connection with the cylinder and is configured for driving the cylinder and the welding head to move. In this way, when the welding device is in use, and after the drive unit drives both the welding head and the welding base to move, the welding head can be driven by the cylinder to weld the object to be welded.

In some embodiments, the welding device further includes a positioning bracket and a fourth guide rail fixed to the positioning bracket; and the cylinder is slidably arranged on the fourth guide rail and capable of sliding, being driven by the first connecting rod, on the fourth guide rail. In this way, when the drive unit drives the cylinder to move through the first connecting rod, it enables the cylinder to move on the fourth guide rail to improve the stability of the cylinder when it moves.

In some embodiments, the welding device further includes a cylinder fixing piece and a fifth guide rail; the cylinder fixing piece is slidably arranged on the fourth guide rail, and the cylinder fixing piece is in driving connection with the another end of the first connecting rod; the fifth guide rail is fixed on the cylinder fixing piece; the welding head is slidably arranged on the fifth guide rail; and the cylinder is fixed on the cylinder fixing piece and is configured for driving the welding head to slide on the fifth guide rail. In this way, when the cylinder drives the welding head to move in the direction close to or away from the welding base, it enables the welding head to move on the fifth guide rail to improve the stability of the welding head when it moves.

In some embodiments, the welding device further includes a positioning bracket and a sixth guide rail fixed to the positioning bracket; the welding base is slidably arranged on the sixth guide rail and capable of sliding, being driven by the second connecting rod, on the sixth guide rail. In this way, when the drive unit drives the welding base to move through the second connecting rod, it enables the welding base to move on the sixth guide rail to improve the stability of the welding base when it moves.

In some embodiments, the welding device further includes a transmission connecting rod, a drive connecting rod, a positioning bracket, and a third stationary shaft fixed to the positioning bracket; the transmission connecting rod is rotatably arranged on the third stationary shaft in a circumferential direction of the third stationary shaft; two ends of the drive connecting rod are respectively in driving connection with one of the transmission connecting rod and the drive unit; and one end of the first connecting rod or one end of the second connecting rod is connected with the transmission connecting rod. In this way, when the drive unit drives the drive connecting rod to move, it drives the transmission connecting rod to rotate circumferentially along the third stationary shaft and drives the first connecting rod or the second connecting rod to move via the transmission connecting rod, thereby driving the welding head or welding base to move.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be practiced in accordance with the contents of the description, and in order to make the above and other objects, features and advantages of the present application more apparent and easy to understand, the specific embodiment of the present application is set forth below.

In the accompanying drawings, unless otherwise specified, the same reference signs throughout the plurality of accompanying drawings indicate identical or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in accordance with the present application and should not be construed as limiting the scope of the present application.

Embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only intended to more clearly illustrate the technical solutions of the present application and are therefore intended as examples only and are not intended to limit the scope of protection of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meanings as are commonly understood by those skilled in the art of the present application. Terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the application. The terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the above description of the drawings are intended to cover non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second" and the like are used only to distinguish different objects and are not understood to indicate or imply relative importance or to imply the number, specific order or primary and secondary relationship of the indicated technical features. In the description of embodiments of the present application, "plurality" means more than two, unless expressly specified otherwise.

"Embodiments" referred to in the present application means that a particular feature, structure, or characteristic described in connection with embodiments is included in at least one embodiment of the present application. The presence of the phrase in various places in the description does not necessarily mean the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments. In the description of embodiments of the present application, the term "and/or" herein is simply a description of the association relationship of the associated objects, indicating that three relationships can exist, for example, A and/or B may indicate that A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" herein generally means that the associated objects are in an "or" relationship.

In the description of the embodiments of the present application, "multiple" refers to more than two (including two). Likewise, "multiple groups" refers to more than two (including two) groups, and "multiple pieces" refers to more than two (including two) pieces.

In the description of the embodiments of the present application, it should be understood that orientation or positional relationships indicated by terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. are based on the orientation or positional relationships shown in the drawings, for ease of description of the embodiments of the present application and simplification of the description only, these terms do not indicate or imply that the apparatus or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be construed as limitations to the embodiments of the present application.

In the present disclosure, unless otherwise explicitly provided and limited, the terms such as "mount," "connect," "couple," and "fix" should be understood broadly, which, for example, may refer to a fixed connection, a detachable connection, or an integral connection; which may refer to a mechanical connection or an electrical connection; which may refer to a direct connection or an indirect connection via an intermediate medium; which may also refer to a communication between the insides of two elements. To a person of normal skill in the art, specific meanings of the above terms in the present disclosure may be construed as dependent on specific situations.

The applicant notes that when the welding device is in use, it is necessary to move the welding head and welding base first to adjust the positions of the welding head and welding base, so as to facilitate the subsequent welding. However, the existing welding device cannot ensure that the welding head and the welding base can be moved simultaneously.

In order to ensure the simultaneous movement of the welding head and the welding base, after indepth study, a welding device is designed. With such a design, when the welding device is in use, it is necessary to move the welding head and the welding base at the same time, and the drive unit can drive the first connecting rod and the second connecting rod to move simultaneously, so that the first connecting rod drives the welding head to move in the direction close to or away from the welding base, and the second connecting rod drives the welding base to move in the direction close to or away from the welding head, thereby ensuring simultaneous movement of the welding head and the welding base.

According to some embodiments of the present application, referring to <FIG>, the present application provides a welding device including a drive unit <NUM>, a first connecting rod <NUM>, a second connecting rod <NUM>, a welding head <NUM>, and a welding base <NUM>. The drive unit <NUM> is connected to one end of the first connecting rod <NUM> and one end of the second connecting rod <NUM>. Another end of the first connecting rod <NUM> is connected with the welding head <NUM>, and is used to drive the welding head <NUM> to move in a direction close to or away from the welding base <NUM> under the drive of the drive unit <NUM>. Another end of the second connecting rod <NUM> is in driving connection with the welding base <NUM>, and is configured for causing, being driven by the drive unit <NUM>, the welding base <NUM> to move in a direction close to or away from the welding head <NUM>.

In an embodiment, when the welding device is used and before the welding device welds the object to be welded, the first connecting rod <NUM> drives the welding head <NUM> to move in a direction close to the welding base <NUM> under the drive of the drive unit <NUM>, and the second connecting rod <NUM> drives the welding base <NUM> to move in a direction close to the welding head <NUM> under the drive of the drive unit <NUM>, so that the welding head <NUM> and the welding base <NUM> move in a direction close to each other, and the distance between the welding head <NUM> and the welding base <NUM> is reduced, so as to facilitate subsequent welding.

In another embodiment, when the welding device is used and before the welding device welds the object to be welded, the first connecting rod <NUM> drives the welding head <NUM> to move in a direction away from the welding base <NUM> under the drive of the drive unit <NUM>, and the second connecting rod <NUM> drives the welding base <NUM> to move in a direction close to the welding head <NUM> under the drive of the drive unit <NUM>, and the displacement of the welding base <NUM> moving is larger than the displacement of the welding head <NUM>, so as to reduce the distance between the welding head <NUM> and the welding base <NUM> to facilitate subsequent welding.

It should be noted that, when the welding device provided in the present application is in use and before welding the object to be welded, the direction in which the drive unit <NUM> drives the welding head <NUM> to move and the direction in which the drive unit drives the welding base <NUM> to move are not limited, as long as the drive unit <NUM> can ensure that the welding head <NUM> and the welding base <NUM> move simultaneously, so as to facilitate subsequent welding.

When the welding device provided by the embodiment of the present application is in use, the welding head <NUM> and the welding base <NUM> need to be moved simultaneously, the first connecting rod <NUM> and the second connecting rod <NUM> can be driven simultaneously by the drive unit <NUM> to move the welding head <NUM> in a direction close to or away from the welding base <NUM> via the first connecting rod <NUM> and the welding base <NUM> in a direction close to or away from the welding head <NUM> via the second connecting rod <NUM>, thereby ensuring that the welding head <NUM> and the welding base <NUM> move synchronously.

Referring to <FIG>, according to some embodiments of the present application, the welding device further includes a shaping plate <NUM>. The shaping plate <NUM> is in driving connection with another end of the first connecting rod <NUM>. The first connecting rod <NUM> moves the welding head <NUM> and the shaping plate <NUM> under the drive of the drive unit <NUM>.

In this way, the drive unit <NUM> can drive the shaping plate <NUM> to move while driving the first connecting rod <NUM> to move, so as to drive the welding head <NUM> to move, so that there is no need to drive the shaping plate <NUM> to move by other parts, thus saving the step sequence.

Specifically, the shaping plate <NUM> is used for shaping the object to be welded. In one example, the object to be welded is a conductive structure and a plurality of cells, and the welding device is used for electrically connecting the conductive structure and the plurality of cells. At this time, the shaping plate <NUM> is used for shaping the plurality of cells to ensure that the plurality of cells are arranged in order. The conductive structure can be a bus bar and the like.

In some embodiments, the corners of the shaping plate <NUM> are chamfered, and the surface of the shaping plate <NUM> is coated with a smooth coating such as a Teflon coating or a ceramic coating, so as to prevent the shaping plate <NUM> from being scratched and damaged by an object to be shaped when the shaping plate <NUM> is treated with an object to be shaped.

According to some embodiments of the present application, the welding device further includes a first fixing component <NUM>. The first fixing component <NUM> is connected to another end of the first connecting rod <NUM> and the welding head <NUM>. In one embodiment, the first fixing component <NUM> is connected with another end of the first connecting rod <NUM>, the welding head <NUM> and the shaping plate <NUM>. The shaping plate <NUM> has a spacing between the first fixing component <NUM>, and the spacing can be increased or decreased.

In the above embodiment, when the drive unit <NUM> simultaneously drives the welding head <NUM> and the shaping plate <NUM> through the first connecting rod <NUM>, and the shaping plate <NUM> is used for shaping, the first fixing component <NUM> and the shaping plate <NUM> can squeeze the elastic member <NUM> by reducing the spacing, so as to prevent the shaping plate <NUM> from exerting excessive pressure on the shaping object during shaping, resulting in damage to the shaping object.

According to some embodiments of the present application, the welding device further includes an elastic member <NUM>. The elastic member <NUM> is located between the first fixing component <NUM> and the shaping plate <NUM>. When the spacing is reduced the elastic member <NUM> is elastically deformed by the pressing of the first fixing piece <NUM> and the shaping plate <NUM>.

In some embodiments, the reaction force applied by the object to be shaped to the shaping plate <NUM> when the spacing is reduced may also be adjusted by replacing the elastic members <NUM> having different modulus of elasticity.

In some embodiments, the welding device further includes a pin (not shown) by which the first fixing component <NUM> is fixed to the shaping plate <NUM> so that the spacing between the first fixing component <NUM> and the shaping plate <NUM> can be increased or decreased, and an elastic member <NUM> is disposed adjacent to the pin and between the first fixing component <NUM> and the shaping plate <NUM>. The number of pins may be four, and the number of elastic members <NUM> may be four, each of which is disposed adjacent to one pin, and the elastic members <NUM> may be springs or the like.

With continued reference to <FIG> and in conjunction with <FIG>, according to some embodiments of the present application, the welding device further includes two cams <NUM> and at least one output shaft <NUM> in drive connection with the drive unit <NUM> and mating with the two cams <NUM>. One end of the first connecting rod <NUM> and one end of the second connecting rod <NUM> are both connected to one cam <NUM>.

In this way, the drive unit <NUM> can drive the two cams <NUM> to rotate through at least one output shaft <NUM>, so as to drive the first connecting rod <NUM> and the second connecting rod <NUM> to move, and then drive the welding head <NUM> and the welding base <NUM> to move.

In one embodiment, both the cam <NUM> and the output shaft <NUM> are made of carbon steel, and the working surfaces of the cam <NUM> and the output shaft <NUM> are heat treated and polished, so that the cam <NUM> and the output shaft <NUM> can withstand periodic impact loads.

According to some embodiments of the present application, the number of output shafts <NUM> is one and the output shafts <NUM> penetrate and are fixed to the two cams <NUM>. Thus, it is ensured that the output shaft <NUM> can rotate the two cams <NUM> under the drive of the drive unit <NUM>. Specifically, the output shaft <NUM> can be fixed to the cam <NUM> by a key.

Specifically, in one example, the drive unit <NUM> includes a motor <NUM>, a synchronous belt <NUM>, and two synchronous belt pulleys (not shown). The output end of the motor <NUM> is in driving connection with one synchronous pulley, and the synchronous pulley is in driving connection with another synchronous pulley via the synchronous belt <NUM>, and the other synchronous pulley is fixed to the output shaft <NUM>, so that the motor <NUM> can drive output shaft <NUM> to rotate via the two synchronous pulleys and the synchronous belt. The motor <NUM> may be in driving connection with the synchronous pulley via a reducer (not shown) and may be a servo motor. In one embodiment, the servo motor has a right-angle reducer to ensure that the starting torque of the motor <NUM> is not too large, and at the same time, the rotation angle of the motor <NUM> is more accurate.

According to some embodiments of the present application, the welding device further includes a first stationary shaft <NUM> and two drive rods <NUM>. The first stationary shaft <NUM> is axially parallel to the output shaft <NUM>. The two drive rods <NUM> are rotatably disposed on the first stationary shaft <NUM> in a circumferential direction of the first stationary shaft <NUM>. The two drive rods <NUM> each include a connecting part <NUM> and a drive part <NUM>, and two drive parts <NUM> are in driving connection with one of the two cams <NUM>. One end of the first connecting rod <NUM> and one end of the second connecting rod <NUM> are both connected to one connecting part <NUM>.

In one embodiment, the drive rod <NUM> is sleeved on the first stationary shaft <NUM>, and the diameter of the first stationary shaft <NUM> is larger, so as to increase the contact area between the drive rod <NUM> and the first stationary shaft <NUM>, thereby improving the stability of the drive rod <NUM> when rotating along the circumferential direction of the first stationary shaft <NUM>.

In this the above embodiments, when the drive unit <NUM> drives the output shaft <NUM> and brings the two cams <NUM> to rotate, each cam <NUM> can drive one drive rod <NUM> to rotate circumferentially along the first stationary shaft <NUM> via the drive part <NUM>, so as to drive one of the first connecting rod <NUM> and the second connecting rod <NUM> to move via two drive rods <NUM>, and then bring the welding head <NUM> and the welding base <NUM> to move. Specifically, in one example, the drive part <NUM> is located between the connecting part <NUM> and the first stationary shaft <NUM>. In another example, the connecting part <NUM> is located between the drive part <NUM> and the first stationary shaft <NUM>.

In one embodiment, the cam <NUM> in driving connection with the drive part <NUM> is a force-closed type cam, and the drive part <NUM> abuts against an outer surface of the cam <NUM>. In this case, the welding device may further include a tension spring <NUM>. The tension spring <NUM> is connected to the transmission rod <NUM> and used for pulling the transmission rod <NUM> in a direction close to the cam <NUM> to ensure that the drive part <NUM> abuts against the outer wheel surface of the cam <NUM>. For example, the drive part <NUM> has bearing rollers, and the bearing rollers come into contact with the outer surface of the cam <NUM> to reduce friction between the drive part <NUM> and the cam <NUM>. For another example, the tension springs <NUM> are double tension springs <NUM>, that is, each tension spring <NUM> has two tension springs, so as to increase the tension force of the tension springs <NUM> on the transmission rod <NUM> and further ensure that the drive part <NUM> abuts against the outer surface of the cam <NUM>.

In yet another embodiment, the cam <NUM>, which is in driving connection with the drive part <NUM>, is a closed type cam, the cam <NUM> is provided with an inner groove, and the drive part <NUM> is slidably provided in the inner groove so that the cam <NUM> is in driving connection with the transmission rod <NUM>. For example, the inner groove of the cam <NUM> is exposed to the outside, thereby facilitating subsequent lubrication and spot check maintenance of the cam <NUM> in the welding device.

In some embodiments, the welding device further includes a positioning bracket <NUM> fixed to the drive unit <NUM>. In an embodiment, the output shaft <NUM> is rotationally disposed on the positioning bracket <NUM>, and the first stationary shaft <NUM> is fixed on the positioning bracket <NUM>. Specifically, the positioning bracket <NUM> includes two opposite output shaft fixing pieces <NUM>, and both ends of the output shaft <NUM> are respectively rotatable on one output shaft fixing piece <NUM>. In addition, the positioning bracket <NUM> also includes two first stationary shaft fixing pieces <NUM> disposed opposite to each other, and both ends of the first stationary shaft <NUM> are respectively fixed to one of the first stationary shaft fixing pieces <NUM>. More specifically, the positioning bracket <NUM> also includes a bottom plate <NUM>. The output shaft fixing piece <NUM> and the first stationary shaft fixing piece <NUM> are fixed to the bottom plate <NUM>, and the motor <NUM> in the drive unit <NUM> is also fixed to the bottom plate <NUM>. In one example, there is also a double row angular contact ball bearing (not shown) between the end of the output shaft <NUM> provided with a synchronous pulley and the output shaft fixing member <NUM>, which is used to withstand the radial load and the axial load of the output shaft <NUM>.

According to some embodiments of the present application and with reference to <FIG>, <FIG> and <FIG>, the welding device further includes a first fixing component <NUM> and a second fixing component <NUM>. The first fixing component <NUM> is connected with another end of the first connecting rod <NUM> and the welding head <NUM>. The second fixing component <NUM> is connected to another end of the second connecting rod <NUM> and the welding base <NUM>.

In this way, when the drive unit <NUM> drives the first fixed assembly <NUM> to move via the first connecting rod <NUM>, the welding head <NUM> can be moved, and when the drive unit <NUM> drives the second fixed assembly <NUM> to move via the second connecting rod <NUM>, the welding base <NUM> can be moved.

With continued reference to <FIG>, and also to <FIG> and <FIG>, according to some embodiments of the present application, the welding device further include a first supporting component <NUM>. When the welding head <NUM> is moved in a direction close to the welding base <NUM>, the first supporting component <NUM> moves to a preset position and abuts against the first fixed assembly <NUM> to prevent the welding head <NUM> from moving in a direction away from the welding base <NUM>.

In this way, after the drive unit <NUM> drives the first fixing component <NUM> to move via the first connecting rod <NUM>, so as to bring the welding head <NUM> to move, the welding head <NUM> can be prevented from moving in the direction away from the welding base <NUM> by the first supporting component <NUM>, so as to improve the stability of the welding head <NUM> while welding.

According to some embodiments of the present application, the welding device further includes a third connecting rod <NUM>. The third connecting rod <NUM> is in driving connection with the drive unit <NUM> and the first supporting component <NUM>, and is configured for causing, being driven by the drive unit <NUM>, the first supporting component <NUM> to move.

In this way, while the drive unit <NUM> moves the first fixing component <NUM> via the first connecting rod <NUM> to move the welding head <NUM>, the drive unit <NUM> can simultaneously move the first supporting component <NUM> via the third connecting rod <NUM> so that after the welding head <NUM> moves in the direction close to the welding base <NUM>, the first supporting component <NUM> can abut against the first fixing component <NUM> and prevent the welding head <NUM> from moving in the direction away from the welding base <NUM>.

According to some embodiments of the present application, the first supporting component <NUM> includes a first guide rail <NUM> fixed on the positioning bracket <NUM>, and a first supporting piece <NUM> slidably arranged on the first guide rail <NUM> and in driving connection with an end portion of the third connecting rod <NUM>; and the third connecting rod <NUM> is configured for driving the first supporting piece <NUM> to slide on the first guide rail <NUM> and bringing the first supporting piece <NUM> against the first fixing component <NUM>.

In this way, the drive unit <NUM> can drive the first supporting piece <NUM> to slide on the first guide rail <NUM> via the third connecting rod <NUM>, and when the drive unit <NUM> moves the first fixing component <NUM> via the first connecting rod <NUM> to move the welding head <NUM>, the first supporting piece <NUM> is made to abut against the first fixing component <NUM> to prevent the welding head <NUM> from moving in the direction away from the welding base <NUM>, thereby improving the stability of the welding head <NUM> and the shaping plate <NUM> when the welding head <NUM> is being welded.

In one embodiment, a welding head support roller <NUM> is provided in the first fixing component <NUM> at an abutment for abutting the first supporting piece <NUM>. When the first supporting piece <NUM> slides on the first guide rail <NUM> and abuts against the first fixing component <NUM>, the first supporting piece <NUM> abuts against the welding head support roller <NUM> to reduce friction when the first supporting piece <NUM> abuts against the first fixing component <NUM>.

According to some embodiments of the present application, the first supporting component <NUM> further includes a second stationary shaft <NUM> and an articulated connecting rod <NUM>. The second stationary shaft <NUM> fixed on the positioning bracket <NUM>. The articulated connecting rod <NUM> is rotatably disposed <NUM> on the second stationary shaft <NUM> in a circumferential direction of the second stationary shaft <NUM>, and opposite ends of the articulated connecting rod <NUM> are respectively connected with one of the third connecting rod <NUM> and the first supporting piece <NUM>.

In this way, the drive unit <NUM> can drive the articulated connecting rod <NUM> through the third connecting rod <NUM> to rotate circumferentially along the second stationary shaft <NUM> to slide the first supporting component <NUM> on the first guide rail <NUM> through the articulated connecting rod <NUM>, so that the first supporting piece <NUM> can abut the first fixing component <NUM> and prevent the welding head <NUM> from moving in the direction away from the welding base <NUM>.

Specifically, in one example, the articulated connecting rod <NUM> is rotationally connected to the third connecting rod <NUM>. In another example, the first supporting piece <NUM> is provided with a slot, the end of the articulated connecting rod <NUM> and the first supporting piece <NUM> is embedded in the slot of the first supporting piece <NUM>, and a roller bearing is arranged between the end of the articulated connecting rod <NUM> and the first supporting piece <NUM> and the wall surface of the slot, so as to reduce the friction between the articulated connecting rod <NUM> and the first supporting piece <NUM> when the articulated connecting rod <NUM> drives the first supporting piece <NUM> to move.

In one embodiment, the positioning bracket <NUM> also includes an upper plate <NUM> and a first side plate <NUM> fixed to the upper plate <NUM>. The plate surface of the upper plate <NUM> intersects the plate surface of the first side plate <NUM>, and the first guide rail <NUM> and the second stationary shaft <NUM> are both fixed to the first side plate <NUM>. In one example, the upper plate <NUM> is fixed to the bottom plate <NUM> by a support frame (not shown), and the plate surface of the upper plate <NUM> is parallel to the plate surface of the bottom plate <NUM>.

With continued reference to <FIG>, and also to <FIG>, according to some embodiments of the present application In, the welding device further includes a second fixing component <NUM>. The second fixing component <NUM> is connected to another end of the second connecting rod <NUM> and the welding base <NUM>. In this way, when the drive unit <NUM> drives the second connecting rod <NUM> to move, the welding base <NUM> can be moved by driving the second fixed assembly <NUM> to move.

According to some embodiments of the present application, the welding device further includes a second supporting component <NUM>. when the welding base <NUM> moves in a direction close to the welding head <NUM>, the second supporting component <NUM> moves to a preset position and abuts against the second fixing component <NUM> to prevent the welding base <NUM> from moving in a direction away from the welding head <NUM>.

In this way, after the drive unit <NUM> drives the second fixing component <NUM> to move via the second connecting rod <NUM>, so as to bring the welding base <NUM> to move, and the welding base <NUM> can be prevented from moving in the direction away from the welding head <NUM> by the second supporting component <NUM>, so as to improve the stability of the welding base <NUM> while the welding heat <NUM> is being welded.

According to some embodiments of the present application, the welding device further includes a fourth connecting rod <NUM>. The fourth connecting rod <NUM> is in driving connection with the drive unit <NUM> and the second supporting component <NUM>, and is configured for causing, being driven by the drive unit <NUM>, the second supporting component <NUM> to move.

In this way, the drive unit <NUM> can drive the second fixing component <NUM> to move via the fourth connecting rod <NUM> while driving the second fixing component <NUM> to move via the second connecting rod <NUM>, so as to bring the welding base <NUM> to move.

According to some embodiments of the present application, the second supporting component <NUM> includes a second guide rail <NUM> fixed on the positioning bracket <NUM>, and a second supporting piece <NUM> slidably arranged on the second guide rail <NUM> and in driving connection with an end portion of the fourth connecting rod <NUM>. The fourth connecting rod <NUM> is configured for driving the second supporting piece <NUM> to slide on the second guide rail <NUM> and bringing the second supporting piece <NUM> against the second fixing component <NUM>.

In this way, the drive unit <NUM> can drive the second supporting piece <NUM> to slide on the second guide rail <NUM> through the fourth connecting rod <NUM>, when the drive unit <NUM> drives the second fixing component <NUM> to move through the second connecting rod <NUM> so as to move the welding base <NUM>, the second supporting member <NUM> is brought into contact with the second fixing component <NUM> to prevent the welding base <NUM> from moving in a direction away from the welding head <NUM>, thereby improving the stability of the welding base <NUM> when the welding head <NUM> is welded.

In one embodiment, a welding base support roller <NUM> is provided at an abutment for abutting the second supporting piece <NUM> in the second fixing component <NUM>. When the second supporting piece <NUM> slides on the second guide rail <NUM> and abuts against the second fixing component <NUM>, the second supporting piece <NUM> abuts against the welding base support roller <NUM> to reduce friction when the second supporting piece <NUM> abuts against the second fixing component <NUM>.

According to some embodiments of the present application, the second supporting component <NUM> further includes a first staging connecting rod <NUM>, a second staging connecting rod <NUM> and a drive shaft <NUM>. The second supporting piece <NUM> is provided with a third guide rail <NUM>, and an extension direction of the third guide rail <NUM> intersects with an extension direction of the second guide rail <NUM>. One end of the first staging connecting rod <NUM> and one end of the second staging connecting rod <NUM> are fixed with the drive shaft <NUM>, another end of the first staging connecting rod <NUM> is in driving connection with an end portion of the fourth connecting rod <NUM>, and another end of the second staging connecting rod <NUM> is slidably arranged on the third guide rail <NUM>. The drive shaft <NUM> is rotatably arranged on the positioning bracket <NUM> in a circumferential direction of the positioning bracket.

Since the extension direction of the third guide rail <NUM> intersects the extension direction of the second guide rail <NUM>. Therefore, when the second staging connecting rod <NUM> rotates in the circumferential direction along the drive shaft <NUM> and another end of the second staging connecting rod <NUM> slides on the third guide rail <NUM>, the second supporting piece <NUM> can be caused to slide on the second guide rail <NUM>. In one example, the extension direction of the third guide rail <NUM> is perpendicular to the extension direction of the second guide rail <NUM>.

In this way, the drive unit <NUM> can drive the first staging connecting rod <NUM> to rotate circumferentially along the drive shaft <NUM> via the fourth connecting rod <NUM>, and drive the second staging connecting rod <NUM> via the drive shaft <NUM> to rotate circumferentially along the drive shaft <NUM>, and slide on the third guide rail <NUM> by means of the other end of the second staging connecting rod <NUM>, causing the second supporting piece <NUM> to slide on the second guide rail <NUM>, thereby allowing the second supporting piece <NUM> to abut the second fixing component <NUM> and preventing the welding base <NUM> from moving in a direction away from the welding head <NUM>.

Specifically, in one example, the first staging connecting rod <NUM> and the fourth connecting rod <NUM> are rotationally connected. In another example, the third guide rail <NUM> is a groove provided on the second supporting piece <NUM>, and a deep groove ball bearing is provided between another end of the second staging connecting rod <NUM> and the groove wall of the third guide rail <NUM> to reduce friction when another end of the second staging connecting rod <NUM> slides on the third guide rail <NUM>.

In one embodiment, the positioning bracket <NUM> is further provided with a fixing seat <NUM> fixed to the upper plate <NUM>, the second guide rail <NUM> is fixed to the upper plate <NUM>, and the drive shaft <NUM> is rotatably arranged on the fixing seat <NUM>.

With continued reference to <FIG>, and also with reference to <FIG>, according to some embodiments of the present application, the above-described welding device further includes a cylinder <NUM> coupled to the welding head <NUM> and configured for driving the welding head <NUM> to move in a direction close to or away from the welding base <NUM>. The another end of the first connecting rod <NUM> is in driving connection with the cylinder <NUM> and is configured for driving the cylinder <NUM> and the welding head <NUM> to move.

In this way, when the welding device is in use, and after the drive unit <NUM> drives both the welding head <NUM> and the welding base <NUM> to move, the welding head <NUM> can be driven by the cylinder <NUM> to weld the object to be welded.

According to some embodiments of the present application, the first fixing component <NUM> further includes a fourth guide rail <NUM> fixed to the positioning bracket <NUM>. The cylinder <NUM> is slidably arranged on the fourth guide rail <NUM> and capable of sliding, being driven by the first connecting rod <NUM>, on the fourth guide rail <NUM>.

In this way, when the drive unit <NUM> drives the cylinder <NUM> to move via the first connecting rod <NUM>, it enables the cylinder <NUM> to move on the fourth guide rail <NUM> to improve the stability of the cylinder <NUM> when it moves. In one embodiment, the fourth guide rail <NUM> includes two parallel rails, and the cylinder <NUM> is slidable on the two rails of the fourth guide rail <NUM>, thereby further improving the stability of the cylinder <NUM> when moving.

According to some embodiments of the present application, the first fixing component <NUM> further includes a cylinder fixing piece <NUM> and a fifth guide rail <NUM>. The cylinder fixing piece <NUM> is slidably arranged on the fourth guide rail <NUM>, and the cylinder fixing piece <NUM> is in driving connection with the another end of the first connecting rod <NUM>. The fifth guide rail <NUM> is fixed on the cylinder fixing piece <NUM>. The welding head <NUM> is slidably arranged on the fifth guide rail <NUM>. The cylinder <NUM> is fixed on the cylinder fixing piece <NUM> and is configured for driving the welding head <NUM> to slide on the fifth guide rail <NUM>.

In this way, when the cylinder <NUM> drives the welding head <NUM> to move in the direction close to or away from the welding base <NUM>, it enables the welding head <NUM> to move on the fifth guide rail <NUM> to improve the stability of the welding head <NUM> when it moves.

Specifically, in one embodiment, the fifth guide rail <NUM> includes two parallel rails, and the welding head <NUM> is slidable on the two rails of the fifth guide rail <NUM>, thereby further improving the stability of the welding head <NUM> when moving. In another embodiment, the cylinder fixing piece <NUM> is rotationally connected to another end of the first connecting rod <NUM>.

In some embodiments, the first fixing component <NUM> further includes a welding head fixing piece <NUM>. The welding head fixing piece <NUM> is slidably disposed on the fifth guide rail <NUM>, and the welding head <NUM> is fixed on the welding head fixing piece <NUM>. For example, the first fixing component <NUM> further includes a shaping plate fixing piece <NUM>. The shape plate fixing piece <NUM> is fixed to the cylinder fixing piece <NUM>, and the shaping plate <NUM> that is fixed to the shaper fixing piece <NUM> with a space therebetween. In one example, the first fixing component <NUM> further includes a fixing upright plate <NUM>. The fixing upright plate <NUM> is slidably disposed on the fifth guide rail <NUM>, and the welding head fixing piece <NUM> is fixed on the fixing upright plate <NUM>.

According to some embodiments of the present application, the second fixing component <NUM> further includes a sixth guide rail <NUM> fixed to the positioning bracket <NUM>. The welding base <NUM> is slidably arranged on the sixth guide rail <NUM> and capable of sliding, being driven by the second connecting rod <NUM>, on the sixth guide rail <NUM>.

In this way, when the drive unit <NUM> drives the welding base <NUM> to move through the second connecting rod <NUM>, it enables the welding base <NUM> to move on the sixth guide rail <NUM> to improve the stability of the welding base <NUM> when it moves. In one embodiment, the sixth guide rail <NUM> includes two parallel rails, and the welding base <NUM> is slidable on the two rails of the sixth guide <NUM>, thereby further improving the stability of the welding base <NUM> when moving. In another embodiment, the second fixing component <NUM> further includes a welding base fixing piece <NUM>. The welding base <NUM> is fixed to the welding base fixing piece <NUM>. The welding base fixing piece <NUM> is slidably disposed on the sixth guide rail <NUM>, and the welding base fixing piece <NUM> is rotationally connected to another end of the second connecting rod <NUM>.

In one embodiment, the positioning bracket <NUM> is further provided with a second side plate <NUM>, the surface of the second side plate <NUM> intersects the surface of the upper plate <NUM>, the second side plate <NUM> is fixed to the upper plate <NUM>, and the sixth guide rail <NUM> is fixed to the second side plate <NUM>.

With continued reference to <FIG> and <FIG>, according to some embodiments of the present application, the welding device further includes a transmission connecting rod <NUM>, a drive connecting rod <NUM>, and a third stationary shaft <NUM> fixed to the positioning bracket <NUM>. The transmission connecting rod <NUM> is provided on the third stationary shaft <NUM>, so as to be rotatable along the circumferential direction of the third stationary shaft <NUM>. Both ends of the drive connecting rod <NUM> are in driving connection with one of the transmission connecting rod <NUM> and the drive unit <NUM>. One end of the first connecting rod <NUM> or one end of the second connecting rod <NUM> is connected with the transmission connecting rod <NUM>.

In this way, when the drive unit <NUM> drives the drive connecting rod <NUM> to move, it drives the transmission connecting rod <NUM> to rotate circumferentially along the third stationary shaft <NUM> and drives the first connecting rod <NUM> or the second connecting rod <NUM> to move via the transmission connecting rod <NUM>, thereby driving the welding head <NUM> or welding base <NUM> to move. In one embodiment, the third stationary shaft <NUM> is located between the drive connecting rod <NUM> and the first connecting rod <NUM>, or the third stationary shaft <NUM> is located between the drive connecting rod <NUM> and the second connecting rod <NUM>.

Specifically, in one embodiment, the number of the transmission connecting rods <NUM>, the drive connecting rods <NUM> and the third stationary shafts <NUM> are two, and the drive unit <NUM> drives the two drive connecting rods <NUM> to move through the output shaft <NUM>, the two cams <NUM> and the two drive rods <NUM>, thereby driving one of the first connecting rod <NUM> and the second connecting rod <NUM> to move through the two drive connecting rods <NUM> and the two transmission connecting rods <NUM>, respectively.

In some embodiments, the drive unit <NUM> may drive the third connecting rod <NUM> and the fourth connecting rod <NUM> in the same manner as the first connecting rod <NUM> and the second connecting rod <NUM> in the previous embodiments. Specifically, the drive unit <NUM> moves one of the third connecting rod <NUM> and the fourth connecting rod <NUM> via the output shaft <NUM>, the two cams <NUM>, the two drive rods <NUM>, the two drive connecting rods <NUM>, and the two transmission connecting rods <NUM>, respectively. In another embodiment, the two cams <NUM> driving the third connecting rod <NUM> and the fourth connecting rod <NUM> are closed cams to ensure that the first supporting component <NUM> can contact the first fixed assembly <NUM> and the second supporting component <NUM> can contact the second fixed assembly <NUM> after the drive unit <NUM> drives the third connecting rod <NUM> and the fourth connecting rod <NUM> to move.

In some embodiments, the positioning bracket <NUM> further includes a support seat <NUM> secured to the side of the upper plate <NUM> adjacent to the bottom plate <NUM>, and the third stationary shaft <NUM> is secured to the support seat <NUM>. In one embodiment, the support seat <NUM> is double support seats, which are respectively arranged at both ends of the third stationary shaft <NUM> and connected with the third stationary shaft <NUM>, wherein the transmission connecting rod <NUM> arranged on the third stationary shaft <NUM> is used for driving the third connecting rod <NUM> or the fourth connecting rod <NUM> to move.

In some embodiments, the displacement of the head <NUM> and the base <NUM> when the drive unit <NUM> is driven may be adjusted by adjusting the lengths of the first connecting rod <NUM>, the second connecting rod <NUM>, the third connecting rod <NUM>, and the fourth connecting rod <NUM>.

In one particular embodiment, the present application provides a welding device When the welding head <NUM> and the welding base <NUM> need to be moved synchronously, the motor <NUM> drives the output shaft <NUM> to rotate via the synchronous belt <NUM> to rotate the four cams <NUM>, and each of the four cams <NUM> drives the first connecting rod <NUM>, the second connecting rod <NUM>, the third connecting rod <NUM> and the fourth connecting rod <NUM> to move via the transmission connecting rod <NUM>, the drive connecting rod <NUM> and the transmission connecting rod <NUM>, thereby driving the welding head <NUM> and the welding base <NUM> to move and causing the first supporting piece <NUM> to abut the welding head <NUM> against the welding head support roller <NUM> of the first fixing component <NUM> fixing the welding head <NUM> to prevent the welding head <NUM> from moving in a direction away from the welding base <NUM>, and the second supporting piece <NUM> to abut the welding head <NUM> against the welding head support roller <NUM> of the second fixing component <NUM> fixing the welding base <NUM> to prevent the welding base <NUM> from moving in a direction away from the welding head <NUM>. In addition, when the welding device performs welding, the welding head <NUM> and the shaping plate <NUM> can be simultaneously driven by the cylinder <NUM> to move, so that welding is performed by the welding head <NUM> and shaping is performed by the shaping plate <NUM>.

Claim 1:
A welding device, comprising: a drive unit (<NUM>), a first connecting rod (<NUM>), a second connecting rod (<NUM>), a welding head (<NUM>) and a welding base (<NUM>);
wherein the drive unit (<NUM>) is in driving connection with one end of the first connecting rod (<NUM>) and one end of the second connecting rod (<NUM>);
another end of the first connecting rod (<NUM>) is in driving connection with the welding head (<NUM>), and is configured for causing, being driven by the drive unit (<NUM>), the welding head (<NUM>) to move in a direction close to or away from the welding base (<NUM>);
and another end of the second connecting rod (<NUM>) is in driving connection with the welding base (<NUM>), and is configured for causing, being driven by the drive unit (<NUM>), the welding base (<NUM>) to move in a direction close to or away from the welding head (<NUM>),
characterized in that
the welding device further comprises two cams (<NUM>) and at least one output shaft (<NUM>) being in driving connection with the drive unit (<NUM>) and mated with the two cams (<NUM>); wherein the one end of the first connecting rod (<NUM>) and the one end of the second connecting rod (<NUM>) are connected with one of the two cams (<NUM>);
one output shaft (<NUM>) is provided, and the output shaft (<NUM>) penetrates through and is fixed to the two cams (<NUM>);
the welding device further comprising a first stationary shaft (<NUM>) and two drive rods (<NUM>); wherein the first stationary shaft (<NUM>) is axially parallel to the output shaft (<NUM>); the two drive rods (<NUM>) are rotatably disposed on the first stationary shaft (<NUM>) in a circumferential direction of the first stationary shaft (<NUM>); the two drive rods (<NUM>) each comprise a connecting part (<NUM>) and a drive part (<NUM>), and two drive parts (<NUM>) are respectively in driving connection with one of the two cams (<NUM>); and one end of the first connecting rod (<NUM>) and one end of the second connecting rod (<NUM>) are in driving connection with one connecting part (<NUM>).