Patent Description:
The description in this section merely provides background information related to the present invention, and does not necessarily constitute the prior art.

The existing pure electric servo bending machine on the market is a new development direction of the bending machine industry at present due to its advantages of energy saving, high efficiency, quick response and no need of hydraulic oil. However, due to the influence of load, bending deformation, deformation caused by eccentric loading and other factors, the current pure electric servo bending machine still has technical bottlenecks.

The existing pure electric servo bending machine usually adopts a screw/nut set as the transmission structure, and generally uses a combination of a single screw and a servo motor as the transmission form. Due to the limitation of the load characteristics of the ball screw, it is difficult for the existing pure electric servo bending machine to be applied to occasions with large load. Besides, in the bending process, the sliding plate will be deformed to some extent due to its abutting operation. In the related art, a combination of a compensating component and a data processing component is used to eliminate this deformation, which, however, is based on the situation that the force bearing points on both ends of the sliding plate are hinged. In the screw/nut set structure in the related art, since the fixation is at the force bearing point of the sliding plate, when the sliding plate is deformed, the nut will drive the screw to deviate from its theoretical position, causing poor bending accuracy and reliability. In addition, in the bending process, the screw will be subject to a rapid reciprocating radial force, which will cause the screw to swing. Combined with the operating characteristics of the screw, the screw may be prone to failure, which greatly reduces the transmission efficiency and service life of the screw.

<CIT> disclosed a press machine, in which the press drive mechanism has a pair of left and right ball thread mechanisms provided aligned with the left and right guides <NUM>. the ball thread mechanisms each comprise a threaded shaft that is oriented vertically, and a nut that threads onto this threaded shaft <NUM> via balls. The nut is operatively engaged with the ram and moves integrally with the punch.

It should be noted that, the foregoing description of the technical background is only for ease of describing the technical solutions of the invention clearly and completely, and is described for ease of understanding by a person skilled in the art. The foregoing technical solutions cannot be considered as known to a person skilled in the art only because the solutions are described in the background part of the present invention.

In order to overcome the defects in the related art, the present invention provides a multi-drive combined bending machine according to claim <NUM>. Further embodiments are the subject of the dependent claims. Under the cooperation of a thrust joint bearing, a transmission component and a bending component, the transmission component is ensured not to be deformed before and after the bending component is deformed, so that the transmission members will not fail.

An embodiment of the present application discloses a multi-drive combined bending machine, which includes a bending component with a vertical plate provided with a bending portion, a driving component and a transmission component. Two ends of the transmission component are respectively connected to the bending component and the driving component so that the transmission component is capable of driving the bending component to move toward a material to be bent under the action of the driving component.

The transmission component includes a transmission member and a mounting member arranged on the transmission member. The mounting member is provided with a connecting member fixedly connected thereto at one end, and the connecting member is sleeved with the bending component rotatable relative thereto. A thrust joint bearing comprising a spherical sliding surface in order to enable the tilting motion sleeved on the connecting member and rotatable relative to the connecting member is arranged between the mounting member and the bending component. The bending component is capable of abutting against the thrust joint bearing, the thrust joint bearing is able to rotate according to the deformation of the vertical plate, so as to rotate relative to the connecting member under an applied force.

Further, there are a plurality of the transmission members, and the plurality of transmission members are symmetrically arranged with respect to the bending component and located at inner and outer sides of the bending component.

Further, the connecting member includes a tie rod with a fixed end being threadedly locked with the mounting member and a free end running through the bending component, and the thrust joint bearing fixedly arranged on the mounting member and having a preset clearance with an outer side wall of the tie rod.

Further, the vertical plate is provided with a mounting notch extending along an inner and outer side direction thereof. The free end of the tie rod is capable of extending into the mounting notch after running through a part of the vertical plate structure along a moving direction of the bending component. The free end of the tie rod is provided with a locking member capable of abutting against an inner side wall of the vertical plate.

Further, a conical member and a spherical member sleeved on the tie rod are further arranged between the locking member and the inner side wall of the vertical plate. A conical surface of the conical member abuts against a spherical surface of the spherical member.

Further, the multi-drive combined bending machine further includes a guide rail extending along the moving direction of the bending component. The guide rail is slidably provided with a guide member capable of being fixedly connected to the vertical plate.

Further, the transmission member includes ball screws extending along a moving direction of the bending component. The transmission member comprises a nut seat, which is threadedly connected with two of the ball screws running through the nut seat, and each of the ball screws corresponds to one of the driving component respectively.

Further, the nut seat is provided with a plurality of lubricating through holes extending to the ball screws, and the lubricating through hole is provided with an oil nozzle.

Further, the driving component includes a servo motor, a first pulley member, a synchronous belt and a second pulley member. An output end of the servo motor is drivingly connected to the first pulley member. The second pulley member is drivingly connected to the transmission component. The timing belt is arranged on the first pulley member and the second pulley member, so as to transmit driving force of the servo motor to the transmission component.

Further, a bearing member running through the ball screws is arranged between the second pulley member and the transmission component. The bearing member includes a gland, a bearing seat and a plurality of thrust angular contact ball bearings.

With reference to the foregoing technical solutions, the beneficial effects of the present invention are analyzed as follows:.

To make the foregoing and other objectives, features, and advantages of the present invention easier to understand, a detailed description is made below by using listed preferred embodiments with reference to the accompanying drawings.

To describe the technical solutions in embodiments of this application or in the existing technology more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the existing technology. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and a person of ordinary skill in the art may derive other drawings from these accompanying drawings without creative efforts.

Reference numerals of the drawings: <NUM>, bending component; <NUM>, driving component; <NUM>, transmission component; <NUM>, connecting member; <NUM>, thrust joint bearing; <NUM>, guide rail; <NUM>, guide member; <NUM>, vertical plate; <NUM>, bending portion; <NUM>, mounting notch; <NUM>, servo motor; <NUM>, first pulley member; <NUM>, synchronous belt; <NUM>, second pulley member; <NUM>, gland; <NUM>, bearing seat; <NUM>, thrust angular contact ball bearing; <NUM>, ball screw; <NUM>, nut seat; <NUM>, lubricating through hole; <NUM>, oil nozzle; <NUM>, locking member; <NUM>, conical member; and <NUM>, spherical member.

The technical solutions of embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention as defined by the appended claims.

It should be noted that in the descriptions of the present invention, terms "first" and "second" are only used to describe the objective and distinguish similar objects without a limitation on a sequence between the two, and cannot be understood as indicating or implying relative importance. In addition, in descriptions of the present invention, "a plurality of" means two or more, unless otherwise stated.

As shown in <FIG>, this embodiment discloses a multi-drive combined bending machine, which includes a bending component <NUM>, a driving component <NUM> and a transmission component <NUM>. The above-mentioned components may be arranged on a machine frame according to mounting needs. Two ends of the transmission component <NUM> are respectively connected to the bending component <NUM> and the driving component <NUM> so that the transmission component <NUM> is capable of driving the bending component <NUM> to move toward a material to be bent under the action of the driving component <NUM>, thereby effectively completing the bending procedure. The bending machine in the present application can work with the numerical control system in the related art to complete the required operations more intelligently.

As shown in <FIG> and <FIG>, in this implementation, the machine frame includes a first wall plate <NUM> and a second wall plate <NUM> extending along a vertical direction and arranged at an interval, and a plurality of connecting plates <NUM> and reinforcing ribs <NUM> disposed horizontally between the first wall plate <NUM> and the second wall plate <NUM>. The first wall plate <NUM> and the second wall plate <NUM> are provided with lifting lugs <NUM>. The number of the lifting lugs <NUM> may be two or a multiple of two. In this way, if the machine frame is to be moved, the machine frame may be fixed to an external apparatus through the lifting lugs <NUM>, and then the machine frame can be moved conveniently. According to the requirements for hardness, weight and other parameters, the machine frame may be made of a steel material, or a combination of a steel material and other materials, which is not limited and described here.

As shown in <FIG>, in this implementation, the transmission component <NUM> is arranged above the bending component <NUM>, the driving component <NUM> is arranged above the transmission component <NUM>, and the driving component <NUM> is arranged on the machine frame. As shown in <FIG>, the bending component <NUM> includes the vertical plate <NUM> extending along the vertical direction and a bending portion <NUM> arranged on the vertical plate <NUM>. Preferably, the bending portion <NUM> is arranged at or near a lower end of the vertical plate <NUM>. The bending portion <NUM> is composed of a tool pressing member and a mounting member <NUM>. The bending portion <NUM> is adaptively arranged according to different requirements for angle, position and other parameters of the material to be bent.

In this implementation, as showed in <FIG>, the driving component <NUM> adopts a pure electric servo drive manner, and specifically includes a pure electric servo motor <NUM>, a first pulley member <NUM>, a synchronous belt <NUM> and a second pulley member <NUM>. In order to have the characteristics of compact structure and small occupied space, the above structure may be preferably mounted in the following manner. The pure electric servo motor <NUM> is fixedly arranged on the machine frame, and an output shaft of the pure electric servo motor <NUM> extends along the vertical direction. The first pulley member <NUM> may be a relatively small pulley that can be drivingly connected to the pure electric servo motor <NUM> and located above the pure electric servo motor <NUM>. The second pulley member <NUM> may be a relatively big pulley. The first pulley member <NUM> and the second pulley member <NUM> are arranged in a same horizontal plane, and can both be engaged with the synchronous belt <NUM> to realize a transmission connection.

According to the above arrangement, when in use, the pure electric servo motor <NUM> outputs a preset speed to drive the first pulley member <NUM> to rotate, and the first pulley member <NUM> can effectively drive the second pulley member <NUM> to rotate through the synchronous belt <NUM>, so that the driving force of the pure electric servo motor <NUM> is effectively transmitted. Of course, the first pulley member <NUM> and the second pulley member <NUM> may also be other transmission structures such as gears, which are not limited and described here.

As shown in <FIG> and <FIG>, due to the influence of the mechanical limit of the worktable and other structures and the bending force, in the bending process, the vertical plate <NUM> of the bending component <NUM> may be arched (deformed) upward in the middle from the two fixed ends, and may also slightly deflect left and right. The deformation and the deflection are manifestations of the rotation of the bending component <NUM> relative to the connecting member <NUM>.

In the related art, a screw/nut set is usually used as the transmission component <NUM>, and the vertical plate <NUM> is fixed with the nut in a rigid connection manner. On the one hand, the above-mentioned deformation may cause the screw to swing along its radial direction all the time under the action of the deforming force, which will cause failures of the screw/nut set such as breakage of the fixed end of the screw. On the other hand, in the traditional mounting and fixing manner, the bolt needs to be aligned with a plurality of parts before running through and being locked with the parts, the locking procedure can only be achieved after ensuring the machining accuracy between the parts, which increases the machining difficulty. However, the technical solution of the transmission component <NUM> in this embodiment can effectively solve the above technical problems.

In this implementation, the transmission component <NUM> includes a transmission member <NUM> and a mounting member <NUM> arranged on the transmission member <NUM>. The mounting member <NUM> is provided with a connecting member <NUM> fixedly connected thereto at one end. The connecting member <NUM> is sleeved with the bending component <NUM> rotatable relative thereto. A thrust joint bearing <NUM> sleeved on the connecting member <NUM> and rotatable relative to the connecting member <NUM> is arranged between the mounting member <NUM> and the bending component <NUM>. The bending component <NUM> is capable of abutting against the thrust joint bearing <NUM>, so as to rotate relative to the connecting member <NUM> under an applied force. With the arrangement of the above structure, when the vertical plate <NUM> of the bending component <NUM> is arched upward, only the thrust joint bearing <NUM> rotates a corresponding angle under the action of the vertical plate <NUM>, and the relative position between the connecting member <NUM>, the mounting member <NUM> and the transmission members <NUM> does not change after the vertical plate <NUM> is arched upward, so that the transmission members <NUM> will not fail as in the related art.

As shown in <FIG>, in one of the embodiments, the transmission member <NUM> is preferably a common ball screw member on the market. The ball screw member includes a ball screw <NUM> extending along the vertical direction and a nut seat <NUM> threadedly sleeved on the ball screw <NUM>. An upper end of the ball screw <NUM> is connected to the second pulley member <NUM> in a transmission manner, so that the ball screw <NUM> can rotate around its own axis under the action of the driving force of the pure electric servo motor <NUM>, thereby driving the nut seat <NUM> to reciprocate along the vertical direction. The vertical plate <NUM> is connected to the nut seat <NUM>, and can move synchronously along the vertical direction with the nut seat <NUM>.

The ball screw members are preferably respectively arranged on the left side and the right side of the upper end of the vertical plate <NUM>. The vertical plate <NUM> is correspondingly provided with a mounting notch <NUM> extending along an inner and outer side direction thereof. Preferably, the mounting notch <NUM> runs through the inner and outer sides of the vertical plate <NUM>. The nut seat <NUM> is provided with a plurality of lubricating through holes <NUM> extending to the ball screws <NUM>, and the lubricating through hole <NUM> is provided with an oil nozzle <NUM>. Lubricating oil may be added to the oil nozzle <NUM> to act on the ball screw <NUM>, thereby performing a lubrication function and prolonging the service life.

As shown in <FIG>, the connecting member <NUM> includes a tie rod extending along the vertical direction. A lower end surface of the mounting member <NUM> is provided with a threaded hole <NUM> extending along the vertical direction. An upper surface of the vertical plate <NUM> is provided with a connecting hole extending along the vertical direction. The connecting hole can communicate with the mounting notch <NUM>. The tie rod has an upper end threadedly locked in the threaded hole <NUM>, and a lower end (free end) extending into the mounting notch <NUM> after running through the connecting hole. The free end of the tie rod is provided with a locking member <NUM> capable of abutting against an inner side wall of the vertical plate <NUM>, so that the nut seat <NUM> can be connected to the vertical plate <NUM> through the tie rod.

The thrust joint bearing <NUM> fixedly arranged on a lower surface of the mounting member <NUM> and capable of abutting against an upper end surface of the vertical plate <NUM>. Due to its spherical sliding surface, the thrust joint bearing may also make a tilting motion (i.e., self-aligning motion) within a certain angle range. It is worth noting that both the vertical plate <NUM> and the thrust joint bearing form a clearance fit with the tie rod.

According to the above arrangement, when the vertical plate <NUM> is deformed, a sliding portion of the thrust joint bearing may rotate a corresponding angle with the vertical plate <NUM> through the arrangement of thrust joint bearing. In combination with the clearance fit, the deformed vertical plate <NUM> and the rotating thrust joint bearing may not contact the tie rod, thereby avoiding mechanical interference. Therefore, the relative position between the tie rod, the nut seat <NUM> and the ball screws <NUM> does not change after the vertical plate <NUM> is deformed, and the screw may not be subject to force in the radial direction, which is completely different from the related art. As a result, the ball screws <NUM> will not fail in the related art.

As shown in <FIG> and <FIG>, in this implementation, there are a plurality of the transmission members. Preferably, the number of the transmission members is four, two in each group. The transmission members in each group are symmetrically arranged with respect to the vertical plate <NUM> and located at inner and outer sides of the vertical plate <NUM>. The four transmission members operate synchronously, and the nut seats <NUM> of the transmission members in each group may be arranged integrally.

In the existing pure electric servo bending machine, limited by the connecting structure between the transmission component <NUM> and the bending component <NUM>, one fixing point can only be provided with one pure electric servo motor <NUM>, which may lead to the defect of small single-point load. In addition, if multi-point arrangement is used on the basis of the above structure to increase the load of the bending machine, the vertical plate <NUM> may be arched like waves in the vertical plane in the working process, which makes the bending machine fail to work with the numerical control system and the compensation mechanism in the related art to realize precise compensation.

In this implementation, with the above arrangement, there may be two transmission members arranged at each fixing point of the vertical plate <NUM>, which doubles the original load. In addition, by using the two-point fixing method, the bending machine of the present invention can work effectively with the numerical control system and the compensation mechanism in the related art on the premise of completely avoiding the failure of the ball screws <NUM>, so as to realize precise compensation.

As shown in <FIG> and <FIG>, in this implementation, a conical member <NUM> and a spherical member <NUM> sleeved on the tie rod are further arranged between the locking member <NUM> and the inner side wall of the vertical plate <NUM>. A conical surface of the conical member <NUM> abuts against a spherical surface of the spherical member <NUM>. The conical member <NUM> is located above of spherical member <NUM>. In the operation process of the two sets of transmission components <NUM>, due to the errors caused by mechanical fit, the heights on the two sides of the vertical plate <NUM> may be slightly different. This problem can be solved by the spherical member <NUM> rotating relative to the conical member <NUM>, which can avoid eccentric loading of the ball screws and lower the difficulty of mounting the vertical plate <NUM> to the machine frame. In this way, the bending portion <NUM> arranged on the vertical plate <NUM> have good parallelism with the worktable, and thus can accurately bend the material to be bent.

An elastic member sleeved on the tie rod is also arranged between conical member <NUM> and the inner side wall of the vertical plate <NUM>. The elastic member includes a spring washer <NUM> sleeved on the tie rod and abutting against the inner side wall of the vertical plate <NUM>, and a disc spring <NUM> located between the spring washer and the conical member <NUM>. Due to its working environment, the vertical plate <NUM> needs to reciprocate rapidly in the vertical direction. The above flexible arrangement, on the one hand, can perform a cushioning function when the vertical plate <NUM> is lifted upward, and the other hand, can cooperate with the conical member <NUM> and the spherical member <NUM> to reduce the difficulty and cost in machining the vertical plate <NUM> and the nut seat <NUM>.

In this implementation, a bearing member is arranged between the second pulley <NUM> and the transmission component <NUM>. Specifically, the bearing member is located below the second pulley member <NUM> and runs through the transmission component <NUM>. The bearing member includes a bearing seat <NUM> fixedly arranged on the machine frame, a plurality of thrust angular contact ball bearings <NUM> located on the bearing seat <NUM>, and a gland <NUM> for limiting the thrust angular contact ball bearings <NUM>. With the above arrangement, the bearing member has a large contact angle, and thus, is less affected by the centrifugal force and more suitable for the ball screws <NUM> rotating at high speed in the present application.

Claim 1:
A multi-drive combined bending machine, comprising a bending component (<NUM>) with a vertical plate (<NUM>) provided with a bending portion (<NUM>), a driving component (<NUM>) and a transmission component (<NUM>), wherein two ends of the transmission component (<NUM>) are respectively connected to the bending component (<NUM>) and the driving component (<NUM>) so that the transmission component (<NUM>) is capable of driving the bending component (<NUM>) to move toward a material to be bent under the action of the driving (<NUM>) component; and
the transmission component (<NUM>) comprises a transmission member (<NUM>) and a mounting member (<NUM>) arranged on the transmission member (<NUM>), the mounting member (<NUM>) is connected with a connecting member (<NUM>) fixedly connected thereto at one end, characterized in that the connecting member (<NUM>) is sleeved with the bending component (<NUM>) rotatable relative thereto, a thrust joint bearing (<NUM>) comprising a spherical sliding surface in order to enable the tilting motion sleeved on the connecting member (<NUM>) and rotatable relative to the connecting member (<NUM>) is arranged between the mounting member (<NUM>) and the bending component (<NUM>), and the bending component (<NUM>) is capable of abutting against the thrust joint bearing (<NUM>), the thrust joint bearing is able to rotate according to the deformation of the vertical plate (<NUM>), so as to rotate relative to the connecting member (<NUM>) under an applied force.