Patent Description:
The application relates to the technical field of cranes, in particular to a counter-balanced mobile device and a crane.

At present, there are two ways to increase the lifting capacity of the automobile crane under the same working condition: one way is to stop working, retract the supporting outriggers, enable the whole vehicle to move to a proper position, extend out the outriggers legs, and then carry out normal hoisting work. In this way, it not only causes low efficiency of the whole vehicle operation, but also increases the fatigue of an operator.

Another way is to add a counterweight. At present, cranes are mostly provided with fixed counterweights, especially for small and medium tonnage cranes. As the increase of the counterweight is limited by the operating condition table, it can only be solved by moving the whole vehicle when the counterweight is increased to a maximum.

The existing fixed counterweight structure limits the improvement of the hoisting performance. Since the moving performance of an automobile crane is not as good as that of a lorry-mounted crane and it is inconvenient to move the whole vehicle, how to develop a technical solution that can change the gravity center of the whole vehicle so as to increase the hoisting performance and the stability is a technical problem to be solved by a person skilled in the art.

<CIT> discloses a counter-balanced mobile device according to the preamble of claim <NUM>.

<CIT> discloses a counter-balanced mobile device.

The application aims to provide a counter-balanced mobile device and a crane so as to solve the technical problem that the improvement of hoisting performance is limited by a counterweight structure in the prior art.

The application provides a counter-balanced mobile device according to claim <NUM>.

Further, the driving member is an oil cylinder.

Further, the connection assembly comprises a swing rack and a lifting oil cylinder; the swing rack is connected with the transmission assembly, the fixed part of the lifting oil cylinder is fixed on the swing rack, and a piston rod of the lifting oil cylinder moves in a vertical direction and is configured to be connected with the counterweight.

Further, the swing rack comprises a connecting portion and a mounting portion, the connecting portion is rotatably connected with the counterweight rack, the mounting portion is barrel-shaped, and the lifting oil cylinder is inserted into the mounting portion.

Further, the counterweight rack is arranged in a rectangular shape, one side of the counterweight rack is configured to be connected with the turntable, and the connection assembly is rotatably connected with a side of the counterweight rack away from the turntable.

Further, the number of the connection assemblies is at least two.

Further, the number of the transmission assemblies and the number of the driving members are at least two, and the at least two connection assemblies, the at least two transmission assemblies and the at least two driving members are arranged in a one-to-one correspondence.

Further, the number of the connection assemblies is two, and the two connection assemblies are symmetrically and rotatably connected to the counterweight rack.

The application provides a crane comprising a frame, a turntable provided on the frame, and a counter-balanced mobile device provided by the application, wherein a counterweight rack in the counter-balanced mobile device is connected with the turntable.

In the process of using the counter-balanced mobile device provided by the application, the counterweight rack is arranged behind the turntable (the position of a suspension arm is the front), the connection assembly is connected with the counterweight rack, and the counterweight is connected with the connection assembly so as to complete the installation of the counterweight on the turntable, thereby achieving the effect of balancing.

In the construction process, the connection assembly can be driven by the driving member to rotate around the center of the rotary connection between the connection assembly and the counterweight rack, so that the distance between the connection assembly and a set reference on the counterweight rack is increased or reduced. After the distance between the connection assembly and the set reference is changed, the distance between the connection assembly and the turntable is also changed. That is, the connection assembly can move backwards (away from the direction of the turntable) or forwards (close to the direction of the turntable) relative to the turntable, and the connection assembly is connected with the counterweight, so that the counterweight can move, and the gravity center of the whole crane can be changed.

The counter-balanced mobile device provided by the application can change the position of the counterweight relative to the turntable, namely the position of the counterweight application point, under the condition that the counterweight amount is not changed, so that the gravity center of the crane is changed, the counter-balancing performance of the crane is improved, the whole crane is prevented from moving, and the stability of the crane is improved. Furthermore, the counter-balanced mobile device provided by the application is simple in structure and low in cost, and occupies small longitudinal space when the connection assembly moves relative to the turntable.

The accompanying drawings, which constitute a part of this application, are included to provide a further understanding of the application.

The illustrative embodiments and descriptions of the application are provided to explain the application and are not to be construed as unduly limiting the application. In the drawings:.

In the figures: <NUM>-counterweight rack; <NUM>-connection assembly; <NUM>-transmission assembly; <NUM>-driving member; <NUM>-swing rack; <NUM>-lifting oil cylinder; <NUM>-lug; <NUM>-first connecting rod; <NUM>-second connecting rod; <NUM>-connecting portion; <NUM>-mounting portion; <NUM>-turntable; <NUM>-counterweight; <NUM>-frame; <NUM>-waist-shaped through hole; and <NUM>-counterweight shaft sleeve.

It should be noted that the embodiments and the features in the embodiments herein may be combined with one another without conflict. The application will now be described in detail, by way of embodiment, with reference to the accompanying drawings.

In the description of the application, it should be noted that the terms "mounted", "connected", or "connecting" should be understood in a broad sense, unless otherwise specifically stated and defined. For example, it can be fixedly connected, removably connected, or integrally connected; it may be connected directly or indirectly through an intermediary, and it may be internal connection of two elements. The specific meaning of the above terms in this application will be understood in specific circumstances by those of ordinary skill in the art.

As shown in <FIG> and <FIG>, the application provides a counter-balanced mobile device comprising a counterweight rack <NUM>, a connection assembly <NUM>, a transmission assembly <NUM>, and a driving member <NUM>, wherein the counterweight rack <NUM> is configured to be connected with a turntable <NUM>, and the connection assembly <NUM> is configured to be connected with a counterweight <NUM>; the connection assembly <NUM> is rotatably connected with the weight frame <NUM>, and the driving member <NUM> is fixed on the weight frame <NUM> and connected with the connection assembly <NUM> by the transmission assembly <NUM> to drive the connection assembly <NUM> to rotate, so that the distance from the connection assembly <NUM> to a set reference on the counterweight rack <NUM> is adjusted.

In the process of using the counter-balanced mobile device provided by the embodiment, the counterweight rack <NUM> is installed behind the turntable <NUM> (the position of a suspension arm is the front), the connection assembly <NUM> is connected with the counterweight rack <NUM>, and the counterweight <NUM> is connected with the connection assembly <NUM>, so that the installation of the counterweight <NUM> on the turntable <NUM> is completed, and the effect of balancing is achieved.

In the construction process, the connection assembly <NUM> can be driven by the driving member <NUM> to rotate around the center of the rotational connection between the connection assembly <NUM> and the counterweight rack <NUM>. When the connection assembly <NUM> swings backwards, the distance between the connection assembly <NUM> and the reference set on the counterweight rack <NUM> increases. When the connection assembly <NUM> swings forwards, the distance between the connection assembly <NUM> and the set reference on the counterweight rack <NUM> decreases. The set reference on the counterweight rack <NUM> can be various, such as a certain line on the counterweight rack <NUM>; or a certain plane; or, a convex block arranged on the counterweight rack <NUM>; and alternatively, a position of the counterweight rack <NUM> connected with the turntable <NUM>. After the distance between the connection assembly <NUM> and the set reference is changed, the distance between the connection assembly <NUM> and the turntable <NUM> is also changed. That is, the connection assembly <NUM> can move backwards (away from the direction of the turntable <NUM>) or forwards (close to the direction of the turntable <NUM>) relative to the turntable <NUM>, and the connection assembly <NUM> is connected with the counterweight <NUM>, so that the the counterweight <NUM> can move, and the gravity center of the whole crane can be changed.

For example, when the load is increased and the amount of the counterweight <NUM> reaches the maximum, the position of the connection assembly <NUM> relative to the turntable <NUM> can be increased, and the counterweight <NUM> moves backwards relative to the turntable <NUM>, so that the gravity center of the crane moves backwards, achieving a balancing effect again; and the whole vehicle does not need to move, the stability of the whole vehicle is improved, and the hoisting performance is improved.

Of course, it is also possible to drive the connection assembly <NUM> to rotate by the driving member <NUM>, so that the distance between the connection assembly <NUM> and the set reference is reduced. That is, the connection assembly <NUM> migrates relative to the turntable <NUM>, thereby translating the counterweight <NUM> relative to the turntable <NUM>.

The counter-balanced mobile device provided by the embodiment can change the position of the counterweight <NUM> relative to the turntable <NUM>, namely the position of the application point of the counterweight <NUM>, under the condition that the counterweight <NUM> amount is unchanged, so that the gravity center of the crane is changed, the counterweight <NUM> performance of the crane is improved, the whole crane is prevented from moving, and the stability of the crane is improved. In addition, the counter-balanced mobile device provided by the embodiment is simple in structure and low in cost, which occupies small longitudinal space when the connection assembly <NUM> moves relative to the turntable <NUM>.

The structural form of the driving member <NUM> and the structural form of the transmission assembly <NUM> can be various. For example, the driving member <NUM> is a swing motor or a hydraulic swing motor or the like, and the transmission assembly <NUM> includes a transmission block.

Alternatively, as shown in <FIG>, the driving member <NUM> comprises a fixed part and a driving part, wherein the fixed part is fixed to the counterweight rack <NUM>, and the driving part can move linearly relative to the fixed part, and the driving part is connected with the first connecting rod <NUM>; the transmission assembly <NUM> comprises a first connecting rod <NUM> and a second connecting rod <NUM>, wherein one end of the first connecting rod <NUM> is rotatably connected with the counterweight rack <NUM>, the other end of the first connecting rod <NUM> is rotatably connected with one end of the second connecting rod <NUM>, and the other end of the second connecting rod <NUM> is rotatably connected with the connection assembly <NUM>. The driving member <NUM> can be an electric telescopic rod, an air cylinder or a motor, a lead screw and a nut assembly and the like; and an oil cylinder is optionally adopted, so that the driving member <NUM> can be uniformly controlled by a hydraulic system of the crane for convenient control.

Specifically, the driving part of the driving member <NUM> and the connection assembly <NUM> are respectively located at both sides of the first connecting rod <NUM>. In this case, when the counterweight <NUM> needs to be moved backwards, after the counterweight <NUM> is detached from the connection assembly <NUM>, the driving part of the driving member <NUM> extends outwards to push the first connecting rod <NUM> to rotate in a direction close to the connection assembly <NUM>; and the first connecting rod <NUM> drives the second connecting rod <NUM> to move, the second connecting rod <NUM> drives the connection assembly <NUM> to swing backwards, thereby increasing the distance of the connection assembly <NUM> relative to the turntable <NUM>. When the connection assembly <NUM> swings forwards, the process of movement of the driving part of the driving member <NUM> is reversed from that described above.

The driving member <NUM> and the transmission assembly <NUM> provided in the embodiment are capable of stably and reliably driving and transmitting, thereby ensuring the normal swing of the connection assembly <NUM>.

The structural form of the connection assembly <NUM> can be various. For example, the connection assembly <NUM> comprises a connecting column or a connecting rack, a hook can be arranged on the connecting column or the connecting rack, and the top of the counterweight <NUM> is provided with a hook hole matched with the hook; alternatively, the counterweight <NUM> is installed in a rack, and the rack in which the counterweight <NUM> is installed is hoisted by the connecting column or the connecting rack.

Alternatively, as shown in <FIG> and <FIG>, the connection assembly <NUM> comprises a swing rack <NUM> and a lifting oil cylinder <NUM>; and the swing rack <NUM> is connected with the transmission assembly <NUM>, the fixed part of the lifting oil cylinder <NUM> is fixed on the swing rack <NUM>, and the piston rod of the lifting oil cylinder <NUM> moves in the vertical direction and is configured to be connected with the counterweight <NUM>. The fixed part of the lifting oil cylinder <NUM> is positioned above, the telescopic rod of the lifting oil cylinder <NUM> is positioned below, and the counterweight <NUM> can be lifted and lowered.

In the embodiment, a lug <NUM> can be arranged at the top of the telescopic rod of the lifting oil cylinder <NUM>, a waist-shaped through hole <NUM> is formed in the counterweight <NUM>, a counterweight shaft sleeve <NUM> is arranged on the top of the counterweight <NUM> and at the waist-shaped through hole <NUM>, and the lug <NUM> is hung in the counterweight shaft sleeve <NUM> to realize the connection of the counterweight <NUM> and the lifting oil cylinder <NUM>.

Specifically, the lug <NUM> has an inverted T-shape in cross-section or other structures capable of forming a step. The counterweight shaft sleeve <NUM> is fixed on the waist-shaped through hole, the counterweight shaft sleeve <NUM> is arranged in a waist-shaped structure matched with the waist-shaped through hole <NUM>, and one end of the counterweight shaft sleeve <NUM> is opened to enable the lug <NUM> of the lifting oil cylinder to be screwed in or out; and the counterweight shaft sleeve <NUM> shields an upward opened part of the waist-shaped through hole <NUM> to form a step to enable the lug <NUM> to be hung on the counterweight shaft sleeve <NUM> after entering the waist-shaped through hole, as shown in <FIG>. The counterweight shaft sleeve <NUM> is shorter than the waist-shaped through hole <NUM>, so that the lug <NUM> can be separated from or enter the waist-shaped through hole by an end of the waist-shaped through hole that is not shielded by the counterweight shaft sleeve <NUM>.

The specific course of movement of the lug <NUM> may be as follows. The lug <NUM> enters the waist-shaped through hole <NUM> from the one end of the waist-shaped through hole <NUM>, the turntable rotates, and the lug <NUM> is screwed into the counterweight shaft sleeve <NUM> from the open end of the counterweight shaft sleeve <NUM>, so that the step of the lug <NUM> is hung with the step formed by the counterweight shaft sleeve <NUM>, and the connection of the lifting oil cylinder and the counterweight is realized.

In the embodiment, when the counterweight <NUM> is separated from the swing rack <NUM>, the lifting oil cylinder <NUM> is pushed downwards, the counterweight <NUM> falls on the frame <NUM>, the lifting oil cylinder <NUM> continues to be pushed downwards until an upper plane of the lug <NUM> is separated from a lower plane of the counterweight shaft sleeve <NUM>. Meanwhile, the turntable <NUM> rotates at a certain angle, and drives the swing rack <NUM> to rotate so as to drive the lug <NUM> of the lifting oil cylinder <NUM> to rotate; the lug <NUM> slides out of a notch of the counterweight shaft sleeve <NUM> to be separated from the counterweight shaft sleeve <NUM> to enter a position of the waist-shaped through hole which is not covered by the counterweight shaft sleeve <NUM>, then the lifting oil cylinder <NUM> retracts, and the counterweight <NUM> is separated from the lifting oil cylinder <NUM>. The process of hanging the counterweight <NUM> on the lifting oil cylinder <NUM> is reversed from the separation process.

According to the connection assembly <NUM> provided by the embodiment, automatic separation and hanging of the counterweight <NUM> can be realized, which is convenient for construction, avoids manual work, and saves time and labor.

In the process of adjusting the position of the counterweight <NUM> relative to the turntable <NUM>, specifically, at the current position, the telescopic rod of the lifting oil cylinder <NUM> extends out to put the counterweight <NUM> on the frame <NUM>; then, the telescopic rod continues to extend out to realize the separation of the lifting oil cylinder <NUM> and the counterweight <NUM>; and the driving member <NUM> drives the swing rack <NUM> to rotate to a set position. The counterweight <NUM> of the frame <NUM> is moved to a position corresponding to the lug <NUM>; and then, the lifting oil cylinder <NUM> extends downwards and extends into the waist-shaped through hole in the counterweight <NUM>. The turntable <NUM> rotates to enable the lug <NUM> to be opposite to the counterweight shaft sleeve <NUM>; the lifting oil cylinder <NUM> retracts to enable the lug <NUM> to be hung on the counterweight shaft sleeve <NUM>; and the lifting oil cylinder <NUM> continues to retract, so that the counterweight <NUM> is hoisted to complete the connection of the counterweight <NUM> and the counterweight rack <NUM>.

In this process, the movement of the counterweight <NUM> on the frame <NUM> may be accomplished in a variety of ways, for example, by an auxiliary tool such as a crane. Alternatively, the counter-balanced mobile device may further comprise a tray slidably provided on the frame <NUM> and a translation oil cylinder connected with the tray to drive the tray to slide on the frame <NUM>, so as to automate the movement of the counterweight <NUM>.

The connection mode of the lifting oil cylinder <NUM> and the swing rack <NUM> can be various. For example, the swing rack <NUM> comprises a supporting plate, and the fixed part of the lifting oil cylinder <NUM> is fixed with the supporting plate.

Alternatively, the swing rack <NUM> comprises a connecting portion <NUM> and a mounting portion <NUM>, wherein the connecting portion <NUM> is rotatably connected with the counterweight rack <NUM>, the mounting portion <NUM> is barrel-shaped, and the lifting oil cylinder <NUM> is inserted into the mounting portion <NUM>. In the embodiment, the lifting oil cylinder <NUM> is inserted into the mounting portion <NUM>, and the fixed part of the lifting oil cylinder <NUM> is fixedly connected with an upper end of the mounting portion <NUM>. This structure can protect the lifting oil cylinder <NUM>, and the fixing of the lifting oil cylinder <NUM> is stable and reliable.

As shown in <FIG>, on the basis of the above-described embodiment, further, the counterweight rack <NUM> is provided in a rectangular shape, one side of the counterweight rack <NUM> is configured to be connected with the turntable <NUM>, and the connection assembly <NUM> is rotatably connected with a side of the counterweight rack <NUM> away from the turntable <NUM>. In the embodiment, the counterweight rack <NUM> has a simple structure, and the connection assembly <NUM> is rotatably connected with a side of the counterweight rack <NUM> away from the turntable <NUM>, thereby facilitating the installation of the connection assembly <NUM>.

It should be noted that the rectangular arrangement refers to a generally rectangular arrangement. As shown in <FIG>, on the basis of the above-described embodiment, further, the number of the connection assemblies <NUM> is at least two. The number of the connection assemblies <NUM> is at least two, so that the installation of the counterweight <NUM> is more stable and reliable.

When the connection assemblies <NUM> are plural, it is preferable that the number of the transmission assemblies <NUM> and the number of the driving members <NUM> are at least two, and the at least two connection assemblies <NUM>, the at least two transmission assemblies <NUM> and the at least two driving members <NUM> are arranged in a one-to-one correspondence. That is, a driving member <NUM> is connected with a connection assembly <NUM> through a transmission assembly <NUM>, so that the driving control is independent of each other, and the control is simple and reliable.

Alternatively, the number of the connection assemblies <NUM> is two, and the two connection assemblies <NUM> are symmetrically and rotatably connected to the weight frame <NUM>. The number of the connection assemblies <NUM> is two, so that the counterweight <NUM> can be stably installed, and the structural complexity caused by the excessive number of the connection assemblies <NUM> can be avoided.

On the basis of the embodiment, a first limiting piece and a second limiting piece can also be arranged to limit the swing rack <NUM> when the swing rack <NUM> is located at a first limit position (the maximum position swinging backwards), and limit the swing rack <NUM> when the swing rack <NUM> is located at a second limit position (the maximum position swinging forwards), so that the stability and the safety of the mobile device are improved.

The structural forms of the first limiting piece and the second limiting piece can be various. For example, the limiting piece (the first limiting piece or the second limiting piece) comprises a limiting block arranged at the limit position of the swing rack (a first limiting block is located at the first limit position, and a second limiting block is located at the second limit position); or the limiting piece comprises a travel switch, a position sensor and other elements capable of detecting the position of the swing rack; the element is in communication connection with a control system of the crane; and when the element detecting the position of the swing rack detects that the swing rack reaches the limit position, a signal is transmitted to the control system.

In the embodiment, due to the arrangement of the limiting piece, excessive rotation of the swing rack can be avoided, and it is convenient to use the swing rack.

The application also provides a crane comprising a frame <NUM>, a turntable <NUM> provided on the frame <NUM>, and a counter-balanced mobile device provided by the application, wherein a counterweight rack <NUM> in the counter-balanced mobile device is connected with the turntable <NUM>.

Claim 1:
A counter-balanced mobile device, characterized by comprising a counterweight rack (<NUM>), a connection assembly (<NUM>), a transmission assembly (<NUM>) and a driving member (<NUM>), wherein the counterweight rack (<NUM>) is configured to be connected with a turntable (<NUM>), and the connection assembly (<NUM>) is configured to be connected with a counterweight (<NUM>); and
the connection assembly (<NUM>) is rotatably connected with the counterweight rack (<NUM>), the driving member (<NUM>) is fixed on the counterweight rack (<NUM>), and is connected with the connection assembly (<NUM>) through the transmission assembly (<NUM>) to drive the connection assembly (<NUM>) to rotate, so that the distance from the connection assembly (<NUM>) to a set reference on the counterweight rack (<NUM>) is adjusted;
whereby the transmission assembly (<NUM>) comprises a first connecting rod (<NUM>) and a second connecting rod (<NUM>), one end of the first connecting rod (<NUM>) is rotatably connected with the counterweight rack (<NUM>) and the driving member (<NUM>) comprises a fixed part and a driving part, whereby the fixed part is fixed on the counterweight rack (<NUM>), the driving part can move linearly relative to the fixed part, and the driving part is connected with the first connecting rod (<NUM>) characterised in that the other end of the first connecting rod (<NUM>) is rotatably connected with one end of the second connecting rod (<NUM>), and the other end of the second connecting rod is rotatably connected with the connection assembly (<NUM>).