Counterweight moving device and crane

Abstract

The present invention relates to the field of crane technology, and in particular to a counterweight moving device and a crane. The counterweight moving device includes a counterweight frame, a connecting assembly, a transmission assembly and a driving member. The counterweight frame is used to connect to a turntable, and the connecting assembly is used to connect to the counterweight; the connecting assembly is rotatably connected to the counterweight frame, and the driving member is fixed to the counterweight frame and connected to the connecting assembly through the transmission assembly to drive the connecting assembly to rotate, thereby adjusting the distance from the connecting assembly to a set reference on the counterweight frame. The counterweight moving device provided by the present invention can achieve the change of the position of the counterweight relative to the turntable, that is, the position of the counterweight action point, without changing the weight of the counterweight, thereby changing the center of gravity of the crane, thereby improving the counterweight performance of the crane, avoiding the movement of the entire crane, and thus improving the stability of the crane.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a counterweight moving device and a crane. Background Art

[0002] At present, there are two ways to increase the lifting capacity of a truck crane under the same working conditions: one way is to stop working first, retract the outriggers, move the vehicle to a suitable position, then extend the outriggers, and then perform normal lifting work. This method not only has low operating efficiency of the vehicle, but also increases operator fatigue.

[0003] Another way is to increase the counterweight. At present, most cranes are mainly fixed counterweight, especially small and medium tonnage cranes. Since the increase of counterweight is limited by the working condition table, and when it is increased to the maximum counterweight, it can only be solved by moving the whole vehicle.

[0004] The current fixed counterweight structure limits the improvement of lifting performance. Since the mobility of truck cranes is not as good as that of truck cranes, it is inconvenient to move the entire vehicle. Therefore, how to develop a technical solution that can change the center of gravity of the entire vehicle to increase lifting performance and stability is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The object of the present invention is to provide a counterweight moving device and a crane to solve the technical problem in the prior art that the counterweight structure limits the improvement of the lifting performance.

[0006] The present invention provides a counterweight moving device, comprising a counterweight frame, a connecting assembly, a transmission assembly and a driving member, wherein the counterweight frame is used to be connected to a turntable, and the connecting assembly is used to be connected to a counterweight;

[0007] The connecting assembly is rotationally connected to the counterweight frame, and the driving member is fixed to the counterweight frame and connected to the connecting assembly through the transmission assembly to drive the connecting assembly to rotate, thereby adjusting the distance from the connecting assembly to a set reference on the counterweight frame.

[0008] Further, the transmission assembly includes a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected to the counterweight frame, and the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the connecting assembly;

[0009] The driving member includes a fixing portion and a driving portion, wherein the fixing portion is fixed on the counterweight frame, and the driving portion can move linearly relative to the fixing portion, and the driving portion is connected to the first connecting rod.

[0010] Furthermore, the driving member is a cylinder.

[0011] Furthermore, the connecting assembly includes a swing frame and a lifting cylinder; the swing frame is connected to the transmission assembly, the fixed part of the lifting cylinder is fixed on the swing frame, the piston rod of the lifting cylinder moves in the vertical direction and is used to connect with the counterweight.

[0012] Furthermore, the swing frame includes a connecting portion and a mounting portion, the connecting portion is rotatably connected to the counterweight frame, the mounting portion is barrel-shaped, and the lifting cylinder is inserted into the mounting portion.

[0013] Furthermore, the counterweight frame is arranged in a rectangular shape, one side of the counterweight frame is used to be connected to the turntable, and the connecting assembly is rotatably connected to a side of the counterweight frame away from the turntable.

[0014] Furthermore, the number of the connecting components is at least two.

[0015] Furthermore, the number of the transmission components and the number of the driving members are both at least two, and the at least two connecting components, the at least two transmission components and the at least two driving members are arranged in a one-to-one correspondence.

[0016] Furthermore, the number of the connecting assemblies is two, and the two connecting assemblies are symmetrically rotationally connected to the counterweight frame.

[0017] The present invention provides a crane, comprising a frame, a turntable arranged on the frame and a counterweight moving device provided by the present invention, wherein the counterweight frame in the counterweight moving device is connected to the turntable.

[0018] In the process of using the counterweight moving device provided by the present invention, the counterweight frame is installed at the rear of the turntable (the position of the boom is in the front), the connecting assembly is connected to the counterweight frame, and the counterweight is connected to the connecting assembly, thereby completing the installation of the counterweight on the turntable, thereby achieving the effect of balancing.

[0019] During the construction process, the connecting assembly can be driven by a driving member to rotate around the center of the rotating connection between the connecting assembly and the counterweight frame, thereby increasing or decreasing the distance of the connecting assembly relative to the set reference on the counterweight frame. When the distance between the connecting assembly and the set reference changes, the distance of the connecting assembly relative to the turntable will naturally change. That is, the connecting assembly can move backward (away from the turntable) or forward (close to the turntable) relative to the turntable, and the connecting assembly is connected to the counterweight, thereby realizing the movement of the counterweight, thereby changing the center of gravity of the entire crane vehicle.

[0020] The counterweight moving device provided by the present invention can change the position of the counterweight relative to the turntable, that is, the position of the counterweight action point, while the counterweight remains unchanged, thereby changing the center of gravity of the crane, thereby improving the counterweight performance of the crane, avoiding the entire crane from moving, and thus improving the stability of the crane. Furthermore, the counterweight moving device provided by the present invention has a simple structure, low cost, and when the connecting assembly moves relative to the turntable, it occupies a small longitudinal space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 is a structural schematic diagram of a counterweight moving device according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Another structural schematic diagram of the counterweight moving device shown.

[0024] In the figure: 10 - counterweight frame; 20 - connecting assembly; 30 - transmission assembly; 40 - driving member; 21 - swing frame; 22 - lifting cylinder; 23 - hanging ear; 31 - first connecting rod; 32 - second connecting rod; 211 - connecting part; 212 - mounting part; 100 - turntable; 200 - counterweight; 300 - frame; 210 - waist-shaped through hole; 220 - counterweight shaft sleeve. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 and Figure 2As shown, the present invention provides a counterweight moving device, including a counterweight frame 10, a connecting assembly 20, a transmission assembly 30 and a driving member 40, the counterweight frame 10 is used to connect with a turntable 100, and the connecting assembly 20 is used to connect with a counterweight 200; the connecting assembly 20 is rotatably connected to the counterweight frame 10, and the driving member 40 is fixed on the counterweight frame 10 and connected to the connecting assembly 20 through the transmission assembly 30 to drive the connecting assembly 20 to rotate, thereby adjusting the distance from the connecting assembly 20 to a setting reference on the counterweight frame 10.

[0028] In the process of using the counterweight moving device provided in this embodiment, the counterweight frame 10 is installed at the rear of the turntable 100 (the position of the boom is in the front), the connecting assembly 20 is connected to the counterweight frame 10, and the counterweight 200 is connected to the connecting assembly 20, thereby completing the installation of the counterweight 200 on the turntable 100, thereby achieving the effect of balancing.

[0029] During the construction process, the connecting assembly 20 can be driven by the driving member 40 to rotate around the center of the rotation connection between the connecting assembly 20 and the counterweight frame 10. When the connecting assembly 20 swings out backward, the distance between the connecting assembly 20 and the set reference on the counterweight frame 10 increases, and when the connecting assembly 20 swings out forward, the distance between the connecting assembly 20 and the set reference on the counterweight frame 10 decreases. The set reference on the counterweight frame 10 can be various, such as: a line on the counterweight frame 10; or a plane; or a bump set on the counterweight frame 10; or the connection between the counterweight frame 10 and the turntable 100. When the distance between the connecting assembly 20 and the set reference changes, the distance of the connecting assembly 20 relative to the turntable 100 naturally changes, that is, the connecting assembly 20 can move backward (away from the turntable 100) or forward (close to the turntable 100) relative to the turntable 100, and the connecting assembly 20 is connected to the counterweight 200, thereby realizing the movement of the counterweight 200, thereby changing the center of gravity of the entire crane vehicle.

[0030] For example, when the load becomes larger and the amount of counterweight 200 reaches the maximum, the position of the connecting assembly 20 relative to the turntable 100 can be increased to achieve the backward movement of the counterweight 200 relative to the turntable 100, thereby moving the center of gravity of the crane backward and playing a balancing role again without moving the entire vehicle, thereby improving the stability of the entire vehicle and enhancing the lifting performance.

[0031] Of course, the connecting assembly 20 can also be driven to rotate by the driving member 40 to reduce the distance between the connecting assembly 20 and the set reference, that is, the connecting assembly 20 migrates relative to the turntable 100, so that the counterweight 200 translates relative to the turntable 100.

[0032] The counterweight moving device provided in this embodiment can change the position of the counterweight 200 relative to the turntable 100, that is, the position of the action point of the counterweight 200, while the amount of the counterweight 200 remains unchanged, thereby changing the center of gravity of the crane, thereby improving the performance of the counterweight 200 of the crane, avoiding the movement of the entire crane, and thus improving the stability of the crane. Furthermore, the counterweight moving device provided in this embodiment has a simple structure and low cost, and when the connecting assembly 20 moves relative to the turntable 100, it occupies a small longitudinal space.

[0033] The structural forms of the driving member 40 and the transmission assembly 30 can be various. For example, the driving member 40 is a swing motor or a hydraulic swing motor, and the transmission assembly 30 includes a transmission block.

[0034] Alternatively, if Figure 2 As shown, the driving member 40 includes a fixed part and a driving part, the fixed part is fixed on the counterweight frame 10, the driving part can move linearly relative to the fixed part, and the driving part is connected to the first connecting rod 31; the transmission assembly 30 includes a first connecting rod 31 and a second connecting rod 32, one end of the first connecting rod 31 is rotatably connected to the counterweight frame 10, and the other end is rotatably connected to one end of the second connecting rod 32, and the other end of the second connecting rod 32 is rotatably connected to the connecting assembly 20. Among them, the driving member 40 can be an electric telescopic rod, a cylinder or a motor, a lead screw and a nut assembly, etc., and optionally a cylinder is used, which can be uniformly controlled by the hydraulic system of the crane, which is convenient for control.

[0035] Specifically, the driving part of the driving member 40 and the connecting assembly 20 are respectively located on both sides of the first connecting rod 31. In this case, when the counterweight 200 needs to be moved backward, the counterweight 200 is removed from the connecting assembly 20, and the driving part of the driving member 40 extends to push the first connecting rod 31 to rotate in the direction close to the connecting assembly 20. The first connecting rod 31 drives the second connecting rod 32 to move, and the second connecting rod 32 drives the connecting assembly 20 to swing backward, thereby increasing the distance between the connecting assembly 20 and the turntable 100. When the connecting assembly 20 swings forward, the movement process of the driving part of the driving member 40 is opposite to the above process.

[0036] The driving member 40 and the transmission assembly 30 provided in this embodiment can stably and reliably drive and transmit, thereby ensuring the normal swing of the connecting assembly 20 .

[0037] The structural form of the connecting component 20 can be various, for example: the connecting component 20 includes a connecting column or a connecting frame, a hook can be set on the connecting column or the connecting frame, and the top of the counterweight 200 is provided with a hook hole that cooperates with the hook; or, the counterweight 200 is installed in a frame, and the connecting column or the connecting frame lifts the frame with the counterweight 200.

[0038] Alternatively, if Figure 1 and Figure 2As shown, the connection assembly 20 includes a swing frame 21 and a lifting cylinder 22; the swing frame 21 is connected to the transmission assembly 30, the fixed part of the lifting cylinder 22 is fixed on the swing frame 21, and the piston rod of the lifting cylinder 22 moves in the vertical direction and is used to connect with the counterweight 200. The fixed part of the lifting cylinder 22 is located at the top, and the telescopic rod of the lifting cylinder 22 is located at the bottom, which can lift and lower the counterweight 200.

[0039] In this embodiment, a hanging ear 23 can be set at the top of the telescopic rod of the lifting cylinder 22, a waist-shaped through hole 210 can be set on the counterweight 200, and a counterweight sleeve 220 can be set on the top of the counterweight 200. The counterweight sleeve 220 is set at the waist-shaped through hole 210, and the hanging ear 23 is hung in the counterweight sleeve 220 to realize the connection between the counterweight 200 and the lifting cylinder 22.

[0040] Specifically, the cross section of the lug 23 is in an inverted T shape or other structure that can form a step. The counterweight sleeve 220 is fixed on the waist-shaped through hole. The counterweight sleeve 220 is a waist-shaped structure that matches the waist-shaped through hole 210. One end of the counterweight sleeve 220 is open so that the lug 23 on the lifting cylinder can be screwed in or out. The counterweight sleeve 220 blocks the upward opening of the waist-shaped through hole 210 to form a step, so that the lug 23 can be hung on the counterweight sleeve 220 after entering the waist-shaped hole. Figure 1 The counterweight sleeve 220 is shorter than the waist-shaped through hole 210 so that the hanging ear 23 can be separated from or enter the waist-shaped through hole from the end of the through hole that is not blocked by the counterweight sleeve 220 .

[0041] The specific movement process of the hanging ear 23 can be as follows: the hanging ear 23 enters the waist-shaped through hole 210 from one end of the waist-shaped through hole 210, the turntable rotates, and the hanging ear 23 is screwed into the counterweight shaft sleeve 220 from the open end of the counterweight shaft sleeve 220, so that the step of the hanging ear 23 is hooked with the step formed by the counterweight shaft sleeve 220, thereby realizing the connection between the lifting cylinder and the counterweight.

[0042] In this embodiment, when the counterweight 200 is separated from the swing frame 21, the lifting cylinder 22 is pushed downward to drop the counterweight 200 onto the vehicle frame 300, and the lifting cylinder 22 continues to be pushed downward until the upper plane of the hanging ear 23 is separated from the lower plane of the counterweight sleeve 220, and at the same time, the turntable 100 rotates a certain angle, and the turntable 100 drives the swing frame 21 to rotate, thereby driving the hanging ear 23 on the lifting cylinder 22 to rotate, and the hanging ear 23 slides out of the notch on the counterweight sleeve 220 and separates from the counterweight sleeve 220 to enter the position of the waist-shaped hole not covered by the counterweight sleeve 220, and then the lifting cylinder 22 of the counterweight 200 is retracted, and the counterweight 200 is completely separated from the lifting cylinder 22. The process of hanging the counterweight 200 on the lifting cylinder 22 is opposite to the separation process.

[0043] The connection assembly 20 provided in this embodiment can realize automatic detachment and automatic attachment of the counterweight 200, which facilitates construction, avoids manual labor, and saves time and effort.

[0044] In the process of adjusting the position of the counterweight 200 relative to the turntable 100, specifically, at the current position, the telescopic rod of the lifting cylinder 22 is extended to place the counterweight 200 on the frame 300; then, the telescopic rod continues to extend to realize the separation of the lifting cylinder 22 and the counterweight 200; then, the driving member 40 drives the swing frame 21 to rotate to the set position; then, the counterweight 200 on the frame 300 is moved to the position corresponding to the hanging ear 23; then, the lifting cylinder 22 is extended downward and extends into the waist-shaped hole on the counterweight 200, the turntable 100 rotates, so that the hanging ear 23 is opposite to the counterweight shaft sleeve 220, the lifting cylinder 22 retracts, so that the hanging ear 23 is hooked with the counterweight shaft sleeve 220, and the lifting cylinder 22 continues to retract, thereby lifting the counterweight 200 and completing the connection between the counterweight 200 and the counterweight frame 10.

[0045] In this process, there are many ways to achieve the movement of the counterweight 200 on the frame 300, such as lifting and moving by auxiliary tools such as a crane. Optionally, the counterweight moving device may also include a tray and a translation cylinder, the tray is slidably arranged on the frame 300, and the translation cylinder is connected to the tray to drive the tray to slide on the frame 300, thereby realizing the automation of the movement of the counterweight 200.

[0046] The lifting cylinder 22 and the swing frame 21 may be connected in various ways. For example, the swing frame 21 includes a support plate, and the fixing portion of the lifting cylinder 22 is fixed to the support plate.

[0047] Optionally, the swing frame 21 includes a connecting portion 211 and a mounting portion 212, the connecting portion 211 is rotatably connected to the counterweight frame 10, the mounting portion 212 is barrel-shaped, and the lifting cylinder 22 is inserted into the mounting portion 212. In this embodiment, the lifting cylinder 22 is inserted into the mounting portion 212, and the fixing portion of the lifting cylinder 22 is fixedly connected to the upper end of the mounting portion 212. This structure can protect the lifting cylinder 22, and the fixing of the lifting cylinder 22 is stable and reliable.

[0048] like Figure 2 As shown, based on the above embodiment, further, the counterweight frame 10 is arranged in a rectangular shape, one side of the counterweight frame 10 is used to connect with the turntable 100, and the connecting assembly 20 is rotatably connected to the side of the counterweight frame 10 away from the turntable 100. In this embodiment, the structure of the counterweight frame 10 is simple, and the connecting assembly 20 is rotatably connected to the side of the counterweight frame 10 away from the turntable 100, which facilitates the installation of the connecting assembly 20.

[0049] It should be noted that the rectangular setting refers to a substantially rectangular setting.

[0050] like Figure 2As shown, based on the above embodiment, further, the number of the connecting components 20 is at least two. The number of the connecting components 20 is at least two, which makes the installation of the counterweight 200 more stable and reliable.

[0051] When there are multiple connecting assemblies 20, preferably, the number of transmission assemblies 30 and the number of driving members 40 are both at least two, and at least two connecting assemblies 20, at least two transmission assemblies 30 and at least two driving members 40 are arranged in a one-to-one correspondence. In other words, one driving member 40 is connected to one connecting assembly 20 through one transmission assembly 30, so that the driving control is independent of each other, making the control simple and reliable.

[0052] Optionally, there are two connection assemblies 20, and the two connection assemblies 20 are symmetrically rotatably connected to the counterweight frame 10. The number of connection assemblies 20 is two, which can satisfy the requirement of stable installation of the counterweight 200 and avoid the complexity of the structure caused by too many connection assemblies 20.

[0053] Based on the above embodiment, a first limit member and a second limit member can also be set to limit the swing frame 21 when it is in the first extreme position (the maximum position of the backward swing), and to limit the swing frame 21 when it is in the second extreme position (the maximum position of the forward swing), so as to improve the stability and safety of the mobile device.

[0054] The first limit member and the second limit member can have various structural forms, for example: the limit member (the first limit member or the second limit member) includes a limit block, and the limit block is set at the extreme position of the swing frame (the first limit block is located at the first extreme position, and the second limit block is located at the second extreme position); or, the limit member includes a travel switch, a position sensor and other elements that can detect the position of the swing frame. This element is communicatively connected to the control system of the crane, and when the element detecting the position of the swing frame detects that the swing frame reaches the extreme position, it sends a signal to the control system.

[0055] In this embodiment, the limiting member is provided to prevent the swing frame from excessively rotating, thereby facilitating use.

[0056] The present invention further provides a crane, comprising a frame 300 , a turntable 100 arranged on the frame 300 , and a counterweight moving device provided by the present invention, wherein the counterweight frame 10 in the counterweight moving device is connected to the turntable 100 .

[0057] The crane provided in this embodiment can change the position of the counterweight 200 relative to the turntable 100 through the counterweight moving device, so that the counterweight 200 moves backward or forward, thereby improving the lifting performance and stability of the crane, and has strong flexibility.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A counterweight moving device, characterized in that: include: A counterweight frame, a connecting assembly, a transmission assembly and a driving member, wherein the counterweight frame is used to be connected to the turntable, and the connecting assembly is used to be connected to the counterweight; The connecting assembly is rotatably connected to the counterweight frame, and the driving member is fixed to the counterweight frame and connected to the connecting assembly through the transmission assembly to drive the connecting assembly to rotate, thereby adjusting the distance from the connecting assembly to a set reference on the counterweight frame; The connecting assembly comprises a swing frame and a lifting cylinder; the swing frame is connected to the transmission assembly, the fixing part of the lifting cylinder is fixed on the swing frame, the piston rod of the lifting cylinder moves in the vertical direction and is used to connect with the counterweight; a hanging ear is provided at the top end of the telescopic rod of the lifting cylinder, a waist-shaped through hole is provided on the counterweight, a counterweight shaft sleeve is provided on the top of the counterweight, the counterweight shaft sleeve is provided at the waist-shaped through hole, and the hanging ear is hung in the counterweight shaft sleeve to realize the connection between the counterweight and the lifting cylinder; The cross section of the hanging ear is in an inverted T shape, the counterweight sleeve is in a waist-shaped structure adapted to the waist-shaped through hole, one end of which is open so that the hanging ear can be screwed in or out, the counterweight sleeve blocks the upward opening part of the waist-shaped through hole to form a step, so that the hanging ear can be hung on the counterweight sleeve after entering the waist-shaped through hole, and the counterweight sleeve is shorter than the waist-shaped through hole, so that the hanging ear can be separated from or enter the waist-shaped through hole from the end of the waist-shaped through hole that is not blocked by the counterweight sleeve; The swing frame includes a connecting portion and a mounting portion, wherein the connecting portion is rotatably connected to the counterweight frame, the mounting portion is barrel-shaped, and the lifting cylinder is inserted into the mounting portion; The transmission assembly comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected to the counterweight frame, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, and the other end of the second connecting rod is rotatably connected to the connecting assembly; The driving member includes a fixing portion and a driving portion, the fixing portion is fixed to the counterweight frame, the driving portion can move linearly relative to the fixing portion, the driving portion is connected to the first connecting rod, and the driving portion of the driving member and the connecting assembly are respectively located on both sides of the first connecting rod; It also includes: a first limit block and a second limit block, wherein the first limit block is arranged at a first limit position of the swing frame, and the second limit block is arranged at a second limit position of the swing frame; The position of the counterweight relative to the turntable is changed by the counterweight moving device, so that the counterweight moves backward or forward; In the process of adjusting the position of the counterweight relative to the turntable, specifically, at the current position, the telescopic rod of the lifting cylinder is extended to place the counterweight on the frame; then, the telescopic rod continues to extend to achieve the separation of the lifting cylinder and the counterweight; then, the driving member drives the swing frame to rotate to the set position; then, the counterweight on the frame is moved to the position corresponding to the hanging ear; then, the lifting cylinder is extended downward and inserted into the waist-shaped through hole on the counterweight, the turntable rotates to make the hanging ear relative to the counterweight shaft sleeve, the lifting cylinder retracts to make the hanging ear hook with the counterweight shaft sleeve, and the lifting cylinder continues to retract, thereby lifting the counterweight and completing the connection between the counterweight and the counterweight frame.

2. The counterweight moving device according to claim 1, characterized in that: The driving member is an oil cylinder.

3. The counterweight moving device according to claim 1 or 2, characterized in that: The counterweight frame is arranged in a rectangular shape, one side of the counterweight frame is used to be connected to the turntable, and the connecting assembly is rotatably connected to the side of the counterweight frame away from the turntable.

4. The counterweight moving device according to claim 3, characterized in that: The number of the connecting components is at least two.

5. The counterweight moving device according to claim 4, characterized in that: The number of the transmission components and the number of the driving members are both at least two, and the at least two connecting components, the at least two transmission components and the at least two driving members are arranged in a one-to-one correspondence.

6. The counterweight moving device according to claim 5, characterized in that: The number of the connecting assemblies is two, and the two connecting assemblies are symmetrically rotatably connected to the counterweight frame.

7. A crane, characterized in that: The invention comprises a vehicle frame, a turntable arranged on the vehicle frame and a counterweight moving device according to any one of claims 1 to 6, wherein the counterweight frame in the counterweight moving device is connected to the turntable.

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