Position-variable double-arm structure and lagging jack trolley

Abstract

The utility model discloses a position-variable double-arm structure and an arch frame trolley. The position-changeable double-arm structure is arranged on a trolley body of the lagging jack trolley and comprises a first arm frame and a second arm frame. Wherein the first arm frame can horizontally rotate and pitch up and down on the first rotary table seat; the second arm frame can horizontally rotate and pitch up and down on the second rotary table seat; and at least one of the first rotary table seat and the second rotary table seat can move left and right relative to the vehicle body, so that at least one of the first arm frame and the second arm frame can move left and right relative to the vehicle body. The utility model solves the problems of large volume, high cost, longer construction time and low construction efficiency caused by unreasonable structure arrangement of the existing tunnel vertical arch frame equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction, and more specifically relates to a position-variable double-arm structure and an arch frame trolley. Background Art

[0002] Before entering the tunnel for construction, it is necessary to reinforce the surrounding rock by means of erecting steel arch grating arches, installing anchor rods, hanging steel mesh, spraying concrete, etc. to ensure construction safety. Taking the erection of arch frames in tunnels as an example, it is usually achieved by an arch frame trolley.

[0003] Existing tunnel arch erection equipment is usually a three-arm arch erection trolley and a two-arm arch erection trolley. Among them, the three-arm arch erection trolley includes a middle arm and left and right arms. When erecting the arch, the left and right arms and the middle arm respectively grab a section of the arch for docking. However, the three-arm arch erection trolley has a large vehicle mass and is very expensive. The two-arm arch erection trolley includes left and right arms arranged in parallel. When erecting the arch, the left arm and the right arm respectively grab a section of the arch and dock it. Then the left arm releases the docked arch section and moves to a position near the arch top to grab the erected arch again (the right arm can release the arch at this time), and then the right arm grabs the arch on the ground and connects it with the previously connected arch section. However, the left and right arms of the two-arm arch erection trolley need to be changed hands once, which wastes time and increases the construction time. Utility Model Content

[0004] In view of the problems of large size, high cost, long construction time and low construction efficiency caused by the unreasonable structural setting of the existing tunnel arch frame equipment, the purpose of the utility model is to provide a variable position double-arm structure, which is arranged on the body of the arch frame trolley, and the variable position double-arm structure includes: a first arm, which is arranged on the body through a first turntable seat, and the first arm can be horizontally rotated and pitched up and down on the first turntable seat; a second arm, which is arranged on the body through a second turntable seat, and the second arm can be horizontally rotated and pitched up and down on the first turntable seat; wherein, at least one of the first turntable seat or the second turntable seat can be moved left and right relative to the body, so that at least one of the first arm or the second arm can move left and right relative to the body.

[0005] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: compared with the traditional three-arm arch trolley, this application adopts a two-arm structure, which is smaller in size and significantly reduces the cost. Compared with the traditional two-arm structure, this application sets at least one of the two arms to move left and right relative to the vehicle body, and can realize the conversion of at least two construction stations through the left and right movement of the arms, so as to meet different construction needs without the need for hand-changing operations, thereby shortening the construction time, improving the construction efficiency, and making the structural design of the variable double-arm structure more reasonable.

[0006] Furthermore, the first arm is located at the front end of the vehicle body, and the second arm is arranged at the rear end of the vehicle body; wherein, when the second arm is folded, the second arm is reversely placed on the vehicle body.

[0007] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: compared with setting the two booms side by side, setting the first boom and the second boom staggered front and back can make the two booms have a larger activity space when working, have a wider construction range, and better avoid the collision of the two arms. It can be understood that the construction point of the arch frame trolley is usually at the rear end of the arch frame trolley. Therefore, under the same construction scenario, the required length of the boom set at the front end of the vehicle body is longer. By setting the second boom at the rear end of the vehicle body, the length of the second boom can be greatly shortened, thereby shortening the length of the entire vehicle, thereby improving the site adaptability of the arch frame trolley. In addition, compared with setting both booms at the rear end of the vehicle body, the center of gravity of the entire vehicle can be more centered, making the weight of the front and rear axles more balanced, avoiding the problem of the arch frame trolley overturning due to the offset of the center of gravity, which is conducive to reducing the axle bearing capacity requirements, thereby achieving the purpose of reducing costs.

[0008] Furthermore, the second turntable seat can move left and right relative to the vehicle body, and the variable double-arm structure also includes: at least one sliding drive unit, arranged on the vehicle body, driving and connecting the second turntable seat, and used to drive the second turntable seat to slide left and right on the vehicle body; at least one sliding guide unit, arranged on the vehicle body, used to guide the sliding direction of the second turntable seat; at least two sliding locking units, used to lock the second turntable seat when the second turntable seat slides to the target position.

[0009] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: the sliding drive part can provide driving force for the left and right movement of the second turntable seat on the vehicle body, the sliding guide part can limit the sliding direction of the second turntable seat, so that the second turntable seat can only slide along the left and right direction of the vehicle body, and the sliding locking part can lock the second turntable seat after it slides to the target position, thereby preventing the second boom from slipping during construction operation at the target position, thereby ensuring the operation stability and construction safety of the boom assembly.

[0010] Furthermore, the sliding drive unit includes: a driving motor, a driving gear, a driven gear, a driving chain, and a chain fixing block; the driving gear is fixedly connected to the output shaft of the driving motor; the driving gear and the driven gear are respectively arranged at the left and right ends of the vehicle body, the driving chain is sleeved on the driving gear and the driven gear, and the chain fixing block is fixedly connected to the driving chain and the second turntable seat; wherein, the driving motor can drive the driving chain to rotate through the driving gear; when the driving chain rotates, it can drive the chain fixing block to slide left and right relative to the vehicle body.

[0011] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the driving force of the driving motor can be transmitted to the chain fixing block through the chain transmission mechanism, and the rotation of the output shaft of the driving motor can be converted into the linear motion of the chain fixing block, thereby driving the second turntable seat fixedly connected to the chain fixing block to slide left and right relative to the vehicle body.

[0012] Furthermore, the variable position double-arm structure includes two sliding drive parts, and the two sliding drive parts are relatively arranged on two sides of the second turntable seat.

[0013] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by arranging two sliding drive parts relatively on both sides of the second turntable seat, the second turntable seat can be driven on both sides, thereby providing sufficient driving force for the second turntable seat and avoiding the situation of overload jamming.

[0014] Furthermore, the sliding guide portion is a guide rail fixedly arranged on the vehicle body, and the variable double-arm structure also includes: at least one guide roller fixedly connected to the second turntable seat; wherein, the guide roller can be slidably arranged in the guide rail to guide the sliding direction of the second turntable seat.

[0015] Compared with the prior art, the technical effect achieved by adopting this technical solution is: by arranging the guide rail on the vehicle body and the guide roller on the second turntable seat, the guide roller can drive the second turntable seat to slide along the extension direction of the guide rail. Furthermore, compared with the sliding friction of the slider sliding in the guide rail, the guide roller and the guide rail have rolling friction, which has less resistance, less friction damage and longer service life.

[0016] Furthermore, the sliding guide portion includes: end limiters, which are arranged at the left and right ends of the guide rail and are used to mechanically limit the second turntable seat after the second turntable seat slides to the target position.

[0017] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting end limiters at the left and right ends of the guide rail, the sliding distance of the second turntable seat is limited. When the second turntable seat slides to the target position at the left and right ends of the guide rail, it can no longer slide forward.

[0018] Furthermore, the sliding locking portion locks the second turntable seat via a positioning pin.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the second turntable seat is locked by the positioning pin, the structural design is simple, the operation is simple and quick, and the locking effect is good.

[0020] Furthermore, the variable double-arm structure also includes: a plurality of reinforcing ribs, which are arranged at the connection between the guide slide rail and the vehicle body, and are used to improve the connection strength between the guide slide rail and the vehicle body.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by arranging a plurality of reinforcing ribs at the connection between the guide rail and the vehicle body, the connection strength at the connection between the guide rail and the vehicle body can be improved, thereby preventing the deformation of the guide rail from affecting the sliding of the second turntable seat.

[0022] Furthermore, the utility model provides an arch trolley, which includes any one of the above-mentioned displaceable double-arm structures.

[0023] Technical effects and advantages of the utility model:

[0024] 1. Compared with the traditional three-arm arch trolley, this application adopts a two-arm structure, which is smaller in size and significantly reduces the cost. Compared with the traditional two-arm structure, this application sets at least one of the two arms to move left and right relative to the vehicle body, and can realize the conversion of at least two construction positions through the left and right movement of the arms to meet different construction needs without the need for hand-changing operations, thereby shortening the construction time and improving the construction efficiency, making the structural design of the variable double-arm structure more reasonable.

[0025] 2. The sliding drive unit can provide driving force for the left and right movement of the second turntable seat on the vehicle body, and the sliding guide unit can limit the sliding direction of the second turntable seat so that the second turntable seat can only slide along the left and right direction of the vehicle body. The sliding locking unit can lock the second turntable seat after it slides to the target position to prevent the second boom from slipping during construction operation at the target position, thereby ensuring the smooth operation of the boom assembly and construction safety.

[0026] 3. By arranging a guide rail on the vehicle body and a guide roller on the second turntable seat, the guide roller can drive the second turntable seat to slide along the extension direction of the guide rail. Furthermore, compared with the sliding friction of the slider sliding in the guide rail, the guide roller and the guide rail have rolling friction, which has less resistance, less friction damage and longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a variable position double-arm structure provided by the utility model;

[0028] Figure 2 yes Figure 1 A schematic diagram of the arm of the medium-positionable double-arm structure in a folded state;

[0029] Figure 3 yes Figure 1 A schematic diagram of the arm frame of the medium-positionable double-arm structure in working condition;

[0030] Figure 4 yes Figure 2 Schematic diagram of the middle sliding guide;

[0031] Figure 5 It is a transmission schematic diagram of the second turntable seat;

[0032] Figure 6 It is a schematic diagram of the specific structure of the second turntable;

[0033] Figure 7 is an enlarged schematic diagram of the sliding guide rail;

[0034] Figure 8 It is a schematic diagram of the connection between the turntable body and the vehicle body;

[0035] Fig. 9 It is a transmission diagram of the turntable body.

[0036] In the figure: 10, first arm; 11, first turntable seat; 20, second arm; 21, first target position; 22, second target position; 30, second turntable seat; 31, turntable body; 32, turntable gear; 33, turntable drive gear; 34, reducer; 35, turntable drive motor; 40, sliding drive part; 41, drive motor; 42, drive gear; 43, driven gear; 44, drive chain; 45, chain fixing block; 50, sliding guide part; 51, guide rail; 52, guide roller; 53, roller mounting block; 60, sliding locking part; 61, first positioning pin hole; 62, second positioning pin hole; 70, end limiter; 80, reinforcing rib; 200, vehicle body. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0038] See also Figure 1 , which is a schematic diagram of a variable position dual-arm structure provided by the utility model. Figures 1 to 9 The variable double-arm structure 100 is arranged on the body of the arch trolley, and the variable double-arm structure 100, for example, includes: a first arm 10, which is arranged on the body 200 through a first turntable seat 11, and the first arm 10 can be horizontally rotated and pitched up and down on the first turntable seat 11; a second arm 20, which is arranged on the body 200 through a second turntable seat 30, and the second arm 20 can be horizontally rotated and pitched up and down on the first turntable seat 11; wherein, at least one of the first turntable seat 11 or the second turntable seat 30 can move left and right relative to the body 200, so that at least one of the first arm 10 or the second arm 20 can move left and right relative to the body 200.

[0039] It is understandable that, compared with the traditional three-arm arch trolley, the present application adopts a two-arm structure, which is smaller in size and significantly reduces the cost. Compared with the traditional two-arm structure, the present application sets at least one of the two arms to be movable left and right relative to the vehicle body 200, and can realize the conversion of at least two construction stations through the left and right movement of the arms, meet different construction needs, and do not need to change hands, thereby shortening the construction time, improving the construction efficiency, and making the structural design of the variable double-arm structure more reasonable.

[0040] Furthermore, the first boom 10 is located at the front end of the vehicle body 200 , and the second boom 20 is arranged at the rear end of the vehicle body 200 ; wherein, when the second boom 20 is folded, the second boom 20 is reversely placed on the vehicle body 200 .

[0041] It is understandable that, compared with setting the two arms side by side, setting the first arm 10 and the second arm 20 staggered front and back can make the two arms have a larger activity space when working, have a wider construction range, and better avoid the collision of the two arms. It is understandable that the construction point of the arch frame trolley is usually at the rear end of the arch frame trolley. Therefore, under the same construction scenario, the required length of the arm set at the front end of the vehicle body 200 is longer. By setting the second arm 20 at the rear end of the vehicle body 200, the length of the second arm 20 can be greatly shortened, thereby shortening the length of the whole vehicle, and then improving the site adaptability of the arch frame trolley. In addition, compared with setting both arms at the rear end of the vehicle body 200, the center of gravity of the whole vehicle can be more centered, making the weight of the front and rear axles more balanced, avoiding the problem of the arch frame trolley overturning due to the center of gravity offset, which is conducive to reducing the axle bearing capacity requirements, thereby achieving the purpose of reducing costs.

[0042] In a specific embodiment, the first boom 10 is a main boom, and the first boom 10 is fixedly arranged at the front end of the vehicle body through the first turntable seat 11. The first boom 10 can rotate horizontally and pitch up and down on the first turntable seat 11. The second boom 20 is an auxiliary arm, and the second boom 20 can move left and right at the rear end of the vehicle body through the second turntable seat 30. The second boom 20 can rotate horizontally and pitch up and down on the second turntable seat 30.

[0043] For example, the turntable body 31 is rotatably disposed on the second turntable seat 30. The turntable body 31 is fixedly connected to the turntable gear 32, and the turntable gear 32 is meshed with the turntable drive gear 33; the driving force output by the turntable drive motor 35 is reduced by the reducer 34 and then transmitted to the turntable gear 32 through the turntable drive gear 33, thereby driving the turntable body 31 to rotate, thereby realizing the horizontal rotation of the second arm 20 on the second turntable seat 30. For example, the turntable drive motor 35 is a hydraulic motor.

[0044] Furthermore, the second turntable seat 30 can move left and right relative to the vehicle body 200, and the variable double-arm structure also includes: at least one sliding drive unit 40, which is arranged on the vehicle body 200, driving and connecting the second turntable seat 30, and used to drive the second turntable seat 30 to slide left and right on the vehicle body 200; at least one sliding guide unit 50, which is arranged on the vehicle body 200, and used to guide the sliding direction of the second turntable seat 30; at least two sliding locking units 60, which are used to lock the second turntable seat 30 when the second turntable seat 30 slides to the target position. For example, the target position includes a first target position 21 and a second target position 22; the first target position 21 is a left workstation, and the second target position 22 is a right workstation. The second arm 20 can realize the conversion of the left and right workstations through the shift drive unit 40, realizing the two-arm three-workstation innovation of the arm assembly.

[0045] It can be understood that the sliding drive unit 40 can provide driving force for the left and right movement of the second turntable seat 30 on the vehicle body 200, the sliding guide unit 50 can limit the sliding direction of the second turntable seat 30, so that the second turntable seat 30 can only slide along the left and right direction of the vehicle body 200, and the sliding locking unit 60 can lock the second turntable seat 30 after the second turntable seat 30 slides to the target position, thereby preventing the second arm 20 from slipping during construction operation at the target position, thereby ensuring the operation stability and construction safety of the arm assembly.

[0046] Furthermore, the sliding drive unit 40 includes: a driving motor 41, a driving gear 42, a driven gear 43, a driving chain 44, and a chain fixing block 45; the driving gear 42 is fixedly connected to the output shaft of the driving motor 41; the driving gear 42 and the driven gear 43 are respectively arranged on the left and right ends of the vehicle body 200, the driving chain 44 is sleeved on the driving gear 42 and the driven gear 43, and the chain fixing block 45 is fixedly connected to the driving chain 44 and the second turntable seat 30; wherein, the driving motor 41 can drive the driving chain 44 to rotate through the driving gear 42; when the driving chain 44 rotates, it can drive the chain fixing block 45 to slide left and right relative to the vehicle body 200.

[0047] For example, the chain fixing block 45 is used to fix the two ends of the driving chain 44 to the second turntable seat 30. The cross section of the chain fixing block 45 is a U-shaped structure.

[0048] It can be understood that the driving force of the driving motor 41 can be transmitted to the chain fixing block 45 through the chain transmission mechanism, and the rotation of the output shaft of the driving motor 41 can be converted into the linear motion of the chain fixing block 45, thereby driving the second turntable seat 30 fixedly connected to the chain fixing block 45 to slide left and right relative to the vehicle body 200.

[0049] Furthermore, the variable position double-arm structure includes two sliding drive parts 40 , and the two sliding drive parts 40 are relatively arranged on two sides of the second turntable seat 30 .

[0050] It is understandable that by arranging two sliding drive parts 40 on both sides of the second turntable seat 30, the second turntable seat 30 can be driven on both sides, thereby providing sufficient driving force for the second turntable seat 30 and avoiding the situation of overload jamming.

[0051] Further, the sliding guide part 50 is a guide rail 51 fixedly arranged on the vehicle body 200, and the variable double-arm structure also includes: at least one guide roller 52, fixedly connected to the second turntable seat 30; wherein the guide roller 52 is slidably arranged in the guide rail 51, and is used to guide the sliding direction of the second turntable seat 30. For example, the guide rail 51 is a C-shaped rail. For example, two guide rails 51 are arranged opposite to each other, and the two sliding drive parts 40 are arranged between the two guide rails 51 and correspond to the two guide rails 51. The second turntable seat 30 also includes a roller mounting block 53, and the two sides of the roller mounting block 53 correspond to the two guide rails 51, and two guide rollers 52 are arranged on each side; when the chain fixing block 45 is fixedly connected to the second turntable seat 30, the second turntable seat 30 is clamped between the two guide rollers 52.

[0052] It is understandable that by providing the guide rail 51 on the vehicle body 200 and the guide roller 52 on the second turntable seat 30, the guide roller 52 can drive the second turntable seat 30 to slide along the extension direction of the guide rail 51. Furthermore, compared with the sliding friction of the slider sliding in the guide rail 51, the guide roller 52 and the guide rail 51 have rolling friction, which has less resistance, less friction damage, and longer service life.

[0053] Furthermore, the sliding guide part 50 includes: an end stopper 70, which is arranged at the left and right ends of the guide rail 51, and is used to mechanically limit the second turntable seat 30 after the second turntable seat 30 slides to the target position. For example, the end stopper 70 is fixedly connected to the vehicle body 200, and the end stopper 70 is located between the two guide rails 51. In a specific embodiment, a drive mounting interface is provided on the end stopper 70, and the drive motor 41, the drive gear 42, and the driven gear 43 are rotatably arranged on the vehicle body 200 through the end stopper 70.

[0054] It is understandable that by setting end limiters 70 at the left and right ends of the guide rail 51, the sliding distance of the second turntable seat 30 is limited. When the second turntable seat 30 slides to the target position at the left and right ends of the guide rail, it can no longer slide forward.

[0055] In a specific embodiment, corresponding to the left and right workstations of the auxiliary arm, there are two end stoppers 70. When the second turntable seat 30 slides to the target position, the end stopper 70 can prevent the roller mounting block 53 from sliding further, thereby limiting the end of the second turntable seat 30.

[0056] Furthermore, the sliding locking portion 60 locks the second turntable seat 30 through a positioning pin. For example, a first positioning pin hole 61 is provided on the guide rail 51, and a second positioning pin hole 62 is provided on the second turntable seat 30. When the second turntable seat 30 slides to the target position, the first positioning pin hole 61 is aligned with the second positioning pin hole 62, and the positioning pin is inserted into the first positioning pin hole 61 and the second positioning pin hole 62 to lock the second turntable seat 30. Among them, the number of the first positioning pin holes 61 corresponds to the number of the target positions of the second turntable seat 30. In a specific embodiment, two first positioning pin holes 61 are provided on the guide rail 51, corresponding to the two target positions of the left station and the right station of the second turntable seat 30 respectively.

[0057] It can be understood that the second turntable seat 30 is locked by the positioning pin, the structural design is simple, the operation is simple and quick, and the locking effect is good.

[0058] Furthermore, the variable double-arm structure further includes: a plurality of reinforcing ribs 80, which are arranged at the connection between the guide rail 51 and the vehicle body 200, and are used to improve the connection strength between the guide rail 51 and the vehicle body 200. For example, the reinforcing ribs 80 are triangular reinforcing ribs.

[0059] It is understandable that by providing a plurality of reinforcing ribs 80 at the connection between the guide rail 51 and the vehicle body 200 , the connection strength at the connection between the guide rail 51 and the vehicle body 200 can be improved, thereby preventing deformation of the guide rail 51 from affecting the sliding of the second turntable seat 30 .

[0060] Furthermore, the utility model provides an arch frame trolley, which includes any one of the displaceable double-arm structures as described above and can achieve the same effect. To avoid repetition, it will not be described here.

[0061] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A variable position dual-arm structure, characterized in that: The variable position double-arm structure is arranged on the body (200) of the arch trolley, and the variable position double-arm structure comprises: A first arm (10) is arranged on the vehicle body (200) via a first turntable seat (11), and the first arm (10) can rotate horizontally and pitch up and down on the first turntable seat (11); A second arm (20) is arranged on the vehicle body (200) via a second turntable seat (30), and the second arm (20) can rotate horizontally and pitch up and down on the second turntable seat (30); Wherein, at least one of the first turntable seat (11) or the second turntable seat (30) can move left and right relative to the vehicle body (200), so that at least one of the first arm (10) or the second arm (20) can move left and right relative to the vehicle body (200).

2. The variable position dual-arm structure according to claim 1, characterized in that: The first arm (10) is located at the front end of the vehicle body (200), and the second arm (20) is arranged at the rear end of the vehicle body (200); wherein, when the second arm (20) is folded, the second arm (20) is reversely placed on the vehicle body (200).

3. A variable position dual-arm structure according to claim 2, characterized in that: The second turntable seat (30) can move left and right relative to the vehicle body (200), and the variable position double-arm structure further includes: At least one sliding drive unit (40) is arranged on the vehicle body (200) and is drivingly connected to the second turntable seat (30) and is used to drive the second turntable seat (30) to slide left and right on the vehicle body (200); At least one sliding guide portion (50) is arranged on the vehicle body (200) and is used to guide the sliding direction of the second turntable seat (30); At least two sliding locking parts (60) are used to lock the second turntable seat (30) when the second turntable seat (30) slides to a target position.

4. The variable position dual-arm structure according to claim 3, characterized in that: The sliding drive unit (40) comprises: a driving motor (41), a driving gear (42), a driven gear (43), a driving chain (44), and a chain fixing block (45); the driving gear (42) is fixedly connected to the output shaft of the driving motor (41); the driving gear (42) and the driven gear (43) are respectively arranged at the left and right ends of the vehicle body (200); the driving chain (44) is sleeved on the driving gear (42) and the driven gear (43); and the chain fixing block (45) is fixedly connected to the driving chain (44) and the second turntable seat (30); The driving motor (41) can drive the driving chain (44) to rotate via the driving gear (42); when the driving chain (44) rotates, it can drive the chain fixing block (45) to slide left and right relative to the vehicle body (200).

5. The variable position dual-arm structure according to claim 3, characterized in that: The variable position double-arm structure comprises two sliding drive parts (40), and the two sliding drive parts (40) are arranged oppositely on two sides of the second turntable seat (30).

6. The variable position dual-arm structure according to claim 3, characterized in that: The sliding guide part (50) is a guide rail (51) fixedly arranged on the vehicle body (200), and the variable position double-arm structure further comprises: At least one guide roller (52) fixedly connected to the second turntable seat (30); Wherein, the guide roller (52) is slidably arranged in the guide rail (51) to guide the sliding direction of the second turntable seat (30).

7. The variable position dual-arm structure according to claim 6, characterized in that: The sliding guide portion (50) comprises: End limiters (70) are arranged at the left and right ends of the guide rail (51) and are used to mechanically limit the second turntable seat (30) after the second turntable seat (30) slides to the target position.

8. The variable position dual-arm structure according to claim 6, characterized in that: The sliding locking portion (60) locks the second turntable seat (30) via a positioning pin.

9. The variable position dual-arm structure according to claim 6, characterized in that: The variable position dual-arm structure also includes: A plurality of reinforcing ribs (80) are arranged at the connection between the guide slide rail (51) and the vehicle body (200) and are used to improve the connection strength between the guide slide rail (51) and the vehicle body (200).

10. An arch trolley, characterized in that: The arch trolley includes a displaceable double-arm structure as described in any one of claims 1-9.

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