DR scanner

Abstract

The utility model relates to the technical field of pipeline detection, and provides a DR scanner which comprises a ray assembly which is arranged on a track assembly in a relatively sliding mode. The imaging assembly is arranged on the track assembly in a relatively sliding manner and is opposite to the ray assembly; the two ends of the linkage rod are hinged to the ray assembly and the imaging assembly respectively. The driving mechanism is arranged on the ray assembly and used for driving the ray assembly to move on the rail assembly. According to the technical scheme, the problems that in the prior art, the imaging plate and the ray machine of the DR scanner respectively adopt independent motors, so that the occupied area is too large, and the processes are asynchronous are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline detection, and more specifically, to a DR scanner. Background Art

[0002] At present, the existing DR external exposure scanners are divided into imaging plate scanners and ray machine traction devices. Both have their own independent power and control systems, occupying a large space and being unable to adapt to the detection of small-diameter pipelines. If internal exposure is used, since the focal length cannot meet the standard requirements and the size of the ray machine is too large to be placed inside the pipeline, the detection requirements cannot be completed. Moreover, having independent drives will cause the processes of the two to be out of sync, resulting in errors. Summary of the Utility Model

[0003] The utility model provides a DR scanner, which solves the problems in the related art that the imaging plate and the ray machine of the DR scanner each use an independent motor, resulting in too large a floor area and out-of-sync processes.

[0004] The technical solution of the utility model is as follows:

[0005] A DR scanner for detecting pipelines, wherein a track assembly is provided on the pipelines, and the DR scanner includes:

[0006] A ray component, which is slidably arranged on the track assembly;

[0007] An imaging component, which is slidably arranged on the track assembly and is opposite to the ray component;

[0008] A connecting rod, with both ends of the connecting rod hinged to the ray component and the imaging component respectively;

[0009] A driving mechanism, which is arranged on the ray component and is used to drive the ray component to move on the track assembly.

[0010] Optionally, the ray component has a first extension rod, the imaging component has a second extension rod, and both ends of the connecting rod are hinged to the ray component and the imaging component through the first extension rod and the second extension rod.

[0011] Optionally, it further includes:

[0012] Quick-release pins, there are two quick-release pins, and the quick-release pins are respectively arranged at the hinged joints of the connecting rod with the first extension rod and the second extension rod.

[0013] Optionally, the imaging component includes:

[0014] A cam mechanism, which is slidably arranged on the track assembly;

[0015] A clamping member, one end of which is arranged on the cam mechanism, and after the cam mechanism contracts, the clamping member abuts against the track assembly;

[0016] An imager mounting member, which is arranged on one side of the cam mechanism.

[0017] Optionally, the cam mechanism includes:

[0018] A housing;

[0019] A first idler shaft assembly, both ends of which are slidably arranged on both sides of the housing, and one end extends out of the housing. There are two first idler shaft assemblies, which are symmetrically distributed with respect to the housing;

[0020] A second idler shaft assembly, both ends of which are slidably arranged on both sides of the housing, and one end extends out of the housing, in the opposite direction to the extending direction of the first idler shaft assembly. There are two second idler shaft assemblies, which are symmetrically distributed with respect to the housing;

[0021] A camshaft, both ends of which are rotatably arranged on the housing. The camshaft penetrates through the two first idler shaft assemblies and the two second idler shaft assemblies. After the camshaft rotates, the extending end of the first idler shaft assembly approaches or moves away from the extending end of the second idler shaft assembly;

[0022] Two movable plates, which are arranged on both sides of the housing. One movable plate is connected to the extending end of the first idler shaft assembly, and the other movable plate is connected to the extending end of the second idler shaft assembly. One end of the clamping member is arranged on the movable plate;

[0023] A locking handle, which is arranged at one end of the camshaft and is used to drive the camshaft to rotate.

[0024] Optionally, the camshaft has cam protrusions used in pairs, and the directions of the cam protrusions used in pairs are opposite. The first idler shaft assembly includes:

[0025] A long shaft, both ends of which are slidably arranged on the housing, and one end extends out of the housing. The long shaft has a chute, and the camshaft penetrates through the chute;

[0026] A linkage plate, one end of which is arranged on the long shaft;

[0027] A short shaft, one end of which is arranged at the other end of the linkage plate, and the other end extends out of the housing and slides. The movable plate is arranged at the extending end of the short shaft;

[0028] Cam abutting block, the cam abutting block is slidably arranged on the long shaft, the cam abutting block has two cam abutting surfaces, after the camshaft rotates, the cam protrusion will abut against one of the cam abutting surfaces;

[0029] Second elastic member, both ends of the second elastic member are respectively arranged on the long shaft and the cam abutting block, and are used to provide a force for the cam abutting block to approach the linkage plate.

[0030] Optionally, the second idler shaft assembly has the same structure as the first idler shaft assembly.

[0031] Optionally, one end of the clamping member is rotatably arranged on the movable plate.

[0032] Optionally, the clamping member includes:

[0033] Mounting bracket, one end of the mounting bracket is rotatably arranged on the movable plate;

[0034] Guide post, one end of the guide post is arranged on the mounting bracket, and the other end is slidably arranged on the movable plate;

[0035] Abutting wheel, the abutting wheel is rotatably arranged on the mounting bracket, and the abutting wheel abuts against and slides on both sides of the track assembly.

[0036] The working principle and beneficial effects of the present utility model are as follows:

[0037] In the present utility model, in order to solve the problems in the related art that the imaging plate and the ray machine of the DR scanner each adopt an independent motor, resulting in too large floor area and out-of-step process, a DR scanner is designed. Specifically, the ray component has a sliding structure to ensure that it can slide smoothly relative to the track assembly. The imaging component also adopts a sliding design to realize synchronous movement with the ray component on the track assembly. The linkage rod is made of high-strength and wear-resistant materials, and its two ends are firmly hinged to the ray component and the imaging component respectively. The drive mechanism selects a high-performance motor and is equipped with a precise control system, and is installed on the ray component to provide strong and stable power for the movement of the ray component on the track assembly.

[0038] The advantage is that this carefully designed structure can ensure the stable, synchronous and high-precision movement of the ray component and the imaging component on the track. During the detection process, it can accurately capture the subtle changes inside the pipeline, greatly improving the accuracy and reliability of the detection. Whether it is for small cracks or tiny defects, it can be keenly detected, providing a strong guarantee for the safe operation of the pipeline. Description of the Drawings

[0039] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present utility model in a clear and understandable manner in combination with the accompanying drawings.

[0040] Figure 1 Schematic diagram of the overall structure of the present utility model;

[0041] Figure 2 Schematic diagram of the internal structure of the cam mechanism of the present utility model;

[0042] Figure 3 Schematic diagram of the imaging assembly structure of the present utility model;

[0043] Figure 4 For the present utility model Figure 2 Enlarged view at position A;

[0044] Figure 5 Schematic diagram of the structure of the first idler shaft assembly of the present utility model;

[0045] Figure 6 Schematic diagram of the structure of the second idler shaft assembly of the present utility model.

[0046] In the figure: 1. Rail assembly, 2. Ray assembly, 3. Imaging assembly, 4. Link rod, 5. Driving mechanism, 201. First extension rod, 301. Second extension rod, 6. Quick-release pin, 7. Cam mechanism, 8. Clamping member, 9. Imager mounting member, 701. Housing, 702. First idler shaft assembly, 703. Second idler shaft assembly, 704. Camshaft, 705. Movable plate, 706. Locking handle, 7041. Cam projection, 7021. Long shaft, 7022. Linking plate, 7023. Short shaft, 7024. Cam abutting block, 7025. Cam abutting surface, 7026. Second elastic member, 7027. Chute, 801. Mounting bracket, 802. Guide post, 803. Contact wheel. Specific embodiments

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the specific embodiments of the present utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other embodiments can also be obtained.

[0048] To simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. Additionally, to simplify the drawings for better understanding, in some figures, only one of the components with the same structure or function is schematically shown, or only one of them is labeled. In this text, "one" not only means "only this one", but also can mean "more than one", and "several" includes "two" and "more than two".

[0049] In this text, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific situations.

[0050] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0051] Referring to Figures 1 to 6 , which is the first embodiment of the present utility model, a DR scanner is proposed for detecting pipelines. A track assembly 1 is provided on the pipeline, including a ray component 2, and the ray component 2 is relatively slidably arranged on the track assembly 1; an imaging component 3 is relatively slidably arranged on the track assembly 1 and is opposite to the ray component 2; both ends of a linkage rod 4 are respectively hinged to the ray component 2 and the imaging component 3; a driving mechanism 5 is arranged on the ray component 2 and is used to drive the ray component 2 to move on the track assembly 1.

[0052] In this embodiment, to solve the problems in the related art that the imaging plate and the ray machine of the DR scanner each use an independent motor, resulting in too large a floor area and asynchronous processes, a DR scanner is designed. Specifically, the ray component 2 has a sliding structure to ensure that it can slide smoothly relative to the track assembly 1. The imaging component 3 also adopts a sliding design to achieve synchronous movement with the ray component 2 on the track assembly 1. The linkage rod 4 is made of high-strength and wear-resistant materials, and both ends of it are firmly hinged to the ray component 2 and the imaging component 3. The driving mechanism 5 selects a high-performance motor and is equipped with a precise control system, and is installed on the ray component 2 to provide strong and stable power for the movement of the ray component 2 on the track assembly 1.

[0053] The advantage is that this carefully designed structure can ensure that the ray component 2 and the imaging component 3 move stably, synchronously and with high precision on the track. During the detection process, it can accurately capture the subtle changes inside the pipeline, greatly improving the accuracy and reliability of the detection. Whether it is for small cracks or tiny defects, it can be keenly detected, providing strong guarantee for the safe operation of the pipeline. For example, in the detection of oil pipelines, it can timely detect tiny corrosion points and avoid potential leakage accidents; in the detection of industrial pipelines, it can accurately detect the subtle defects of welds and repair them in advance, extending the service life of the pipeline.

[0054] Furthermore, the ray component 2 has a first extension rod 201, the imaging component 3 has a second extension rod 301, and both ends of the linkage rod 4 are hinged to the ray component 2 and the imaging component 3 through the first extension rod 201 and the second extension rod 301.

[0055] In this embodiment, a prominent first extension rod 201 is provided on the ray component 2, and its material is selected as high-strength alloy to ensure its good mechanical properties. The second extension rod 301 is also manufactured on the imaging component 3. Both ends of the linkage rod 4 are precisely hinged to the first extension rod 201 and the second extension rod 301 through special hinge components. These hinge components adopt advanced lubrication and sealing technologies to reduce friction and wear, and improve the flexibility and durability of the hinge.

[0056] The advantage is that the setting of the extension rod not only increases the flexibility of the connection between the linkage rod 4 and the ray component 2 and the imaging component 3, making the installation, debugging and maintenance of the equipment more convenient. Moreover, this design greatly enhances the stability of the entire structure and can withstand greater external forces and vibrations. For example, when encountering strong vibrations or impacts during the pipeline detection process, the extension rod and the hinge structure can effectively buffer and disperse the forces, protecting the key components of the equipment from damage. At the same time, when component replacement or repair of the equipment is required, it is convenient for quick disassembly and installation, significantly improving the maintainability and use efficiency of the equipment.

[0057] Furthermore, it also includes quick-release pins 6. There are two quick-release pins 6, and the quick-release pins 6 are respectively arranged at the hinge joints of the linkage rod 4 with the first extension rod 201 and the second extension rod 301.

[0058] In this embodiment, stainless steel quick-release pins 6 are respectively installed at the hinge joints of the linkage rod 4 with the first extension rod 201 and the second extension rod 301. The installation of the quick-release pins 6 ensures convenient and fast operation during the disassembly and installation process. At the same time, in order to improve the stability and safety of the quick-release pins 6, special locking devices are also equipped to prevent accidental detachment during the working process.

[0059] The advantage is that the use of the quick-release pin 6 greatly facilitates the maintenance of the device and the replacement of components. When it is necessary to repair or replace the linkage rod 4 or other related components, the quick-release pin 6 can be quickly disassembled with simple operations, saving a large amount of time and labor costs. This design is of great significance in practical applications. For example, in an emergency where a faulty component needs to be quickly replaced to restore the operation of the device, it can respond quickly, reduce the device downtime, and improve the production efficiency. At the same time, a special locking device ensures the stability and safety of the quick-release pin 6 during the normal operation of the device, avoiding accidents caused by component detachment.

[0060] Furthermore, the imaging assembly 3 includes a cam mechanism 7, and the cam mechanism 7 is relatively slidably arranged on the track assembly 1; one end of the clamping member 8 is arranged on the cam mechanism 7, and after the cam mechanism 7 contracts, the clamping member 8 abuts against the track assembly 1; the imager mounting member 9 is arranged on one side of the cam mechanism 7.

[0061] In this embodiment, the imaging assembly 3 includes a cam mechanism 7, a clamping member 8, and an imager mounting member 9. Specifically, the cam mechanism 7 is relatively slidably arranged on the track assembly 1, and by adjusting the cam mechanism 7, the clamping member 8 can clamp the track assembly 1, thereby controlling the position of the imager.

[0062] The advantage is that the stable clamping of the clamping member 8 on the track assembly 1 effectively reduces the shaking and displacement of the imager during the detection process, greatly improving the clarity and resolution of the imaging, so that even minor pipeline defects can be clearly captured.

[0063] Furthermore, the cam mechanism 7 includes a housing 701; both ends of the first idler shaft assembly 702 are slidably arranged on both sides of the housing 701, and one end extends out of the housing 701. There are two first idler shaft assemblies 702, which are symmetrically distributed with respect to the housing 701; both ends of the second idler shaft assembly 703 are slidably arranged on both sides of the housing 701, and one end extends out of the housing 701, in the opposite direction to the extending direction of the first idler shaft assembly 702. There are two second idler shaft assemblies 703, which are symmetrically distributed with respect to the housing 701; both ends of the camshaft 704 are rotatably arranged on the housing 701, and the camshaft 704 passes through the two first idler shaft assemblies 702 and the two second idler shaft assemblies 703. After the camshaft 704 rotates, the extending end of the first idler shaft assembly 702 approaches or moves away from the extending end of the second idler shaft assembly 703; there are two movable plates 705, and the two movable plates 705 are arranged on both sides of the housing 701. One movable plate 705 is connected to the extending end of the first idler shaft assembly 702, and the other movable plate 705 is connected to the extending end of the second idler shaft assembly 703. One end of the clamping member 8 is arranged on the movable plate 705; a locking handle 706 is arranged at one end of the camshaft 704, and the locking handle 706 is used to drive the camshaft 704 to rotate.

[0064] In this embodiment, the cam mechanism 7 includes a housing 701, a first idler shaft assembly 702, a second idler shaft assembly 703, a camshaft 704, a movable plate 705, and a locking handle 706. Specifically, when the clamping member 8 needs to clamp the track assembly 1, the locking handle 706 is rotated to cause the first idler shaft assembly 702 and the second idler shaft assembly 703 to slide in opposite directions, thereby driving the clamping members 8 mounted on the sliding plate to approach each other.

[0065] The advantage is that this design can quickly and accurately adjust the distance between the clamping members 8 by controlling the locking handle 706, thereby quickly clamping the track assembly 1. The error caused by the clamping problem is reduced, and the labor intensity of the workers is also reduced.

[0066] Furthermore, the camshaft 704 has paired cam protrusions 7041, and the directions of the paired cam protrusions 7041 are opposite. The first idler shaft assembly 702 includes a long shaft 7021. Both ends of the long shaft 7021 are slidably disposed on the housing 701, and one end extends out of the housing 701. The long shaft 7021 has a chute 7027, and the camshaft 704 passes through the chute 7027; one end of a linkage plate 7022 is disposed on the long shaft 7021; one end of a short shaft 7023 is disposed at the other end of the linkage plate 7022, and the other end extends out of the housing 701 and is slidable. The movable plate 705 is disposed at the extending end of the short shaft 7023; a cam abutting block 7024 is slidably disposed on the long shaft 7021. The cam abutting block 7024 has two cam abutting surfaces 7025. After the camshaft 704 rotates, the cam protrusion 7041 will abut against one of the cam abutting surfaces 7025; both ends of a second elastic member 7026 are respectively disposed on the long shaft 7021 and the cam abutting block 7024, and are used to provide a force for the cam abutting block 7024 to approach the linkage plate 7022.

[0067] Furthermore, the second idler shaft assembly 703 has the same structure as the first idler shaft assembly 702.

[0068] In this embodiment, both the first idler shaft assembly 702 and the second idler shaft assembly 703 include a long shaft 7021, a linkage plate 7022, a short shaft 7023, a cam abutting block 7024, and a second elastic member 7026. Specifically, when the locking handle 706 rotates, the camshaft 704 passing through the chute 7027 will rotate synchronously. The cam protrusions 7041 used in pairs and with opposite directions on the camshaft 704 will abut against a cam abutting surface 7025 on the cam abutting block 7024. Since the cam protrusions 7041 have opposite directions and the two cam abutting surfaces 7025 are also arranged oppositely, the first idler shaft assembly 702 and the second idler shaft assembly 703 will slide in different directions. Since the movable plate 705 is connected to the extending ends of the long shaft 7021 and the short shaft 7023, the movable plate 705 and the clamping member 8 mounted on the movable plate 705 will move accordingly, so that the clamping member 8 clamps or releases the track assembly 1. During the operation, the second elastic member 7026 will always provide a force for the cam abutting block 7024 to approach the linkage plate 7022. The linkage plate 7022 is used to connect the long shaft 7021 and the short shaft 7023 to make the long shaft 7021 and the short shaft 7023 move synchronously.

[0069] Further, one end of the clamping member 8 is rotatably arranged on the movable plate 705.

[0070] In this embodiment, one end of the clamping member 8 is rotatably arranged on the movable plate 705. Specifically, according to the diameter of the pipeline to be detected, the angle of the clamping member 8 on the movable plate 705 is adjusted. The advantage of this design is that it can detect pipelines of more models.

[0071] Further, the clamping member 8 includes a mounting bracket 801, one end of the mounting bracket 801 is rotatably arranged on the movable plate 705; one end of a guide post 802 is arranged on the mounting bracket 801, and the other end is slidably arranged on the movable plate 705; a contact wheel 803 is rotatably arranged on the mounting bracket 801, and the contact wheel 803 abuts against and slides on both sides of the track assembly 1.

[0072] In this embodiment, the clamping member 8 includes a mounting bracket 801, a guide post 802, and a contact wheel 803. Specifically, one end of the mounting bracket 801 is rotatably arranged on the movable plate 705, one end of the guide post 802 is arranged on the mounting bracket 801, and the other end of the guide post 802 is slidably arranged on the movable plate 705. The position of the guide post 802 and the movable plate 705 can be fixed by a locking member. So that the contact wheel 803 abuts against the track assembly 1 more stably.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A DR scanner for inspecting a pipeline, wherein a track assembly (1) is arranged on the pipeline, characterized in that: include: A ray assembly (2), the ray assembly (2) being relatively slidably arranged on the track assembly (1); An imaging component (3), the imaging component (3) being relatively slidably arranged on the track assembly (1) and being opposite to the ray component (2); A connecting rod (4), wherein two ends of the connecting rod (4) are respectively hinged to the ray assembly (2) and the imaging assembly (3); A driving mechanism (5), wherein the driving mechanism (5) is arranged on the ray assembly (2) and is used to drive the ray assembly (2) to move on the track assembly (1).

2. A DR scanner according to claim 1, characterized in that: The ray assembly (2) has a first extension rod (201), the imaging assembly (3) has a second extension rod (301), and two ends of the linkage rod (4) are hingedly connected to the ray assembly (2) and the imaging assembly (3) via the first extension rod (201) and the second extension rod (301).

3. A DR scanner according to claim 2, characterized in that: Also includes: Quick-release pins (6), two of which are provided, and the quick-release pins (6) are respectively arranged at the hinged joints between the linkage rod (4) and the first extension rod (201) and the second extension rod (301).

4. A DR scanner according to claim 1, characterized in that: The imaging component (3) comprises: A cam mechanism (7), the cam mechanism (7) being relatively slidably arranged on the track assembly (1); a clamping member (8), one end of the clamping member (8) being arranged on the cam mechanism (7), and the clamping member (8) abutting against the track assembly (1) after the cam mechanism (7) contracts; An imager mounting member (9), wherein the imager mounting member (9) is arranged on one side of the cam mechanism (7).

5. A DR scanner according to claim 4, characterized in that: The cam mechanism (7) comprises: Shell (701); A first idler shaft assembly (702), wherein both ends of the first idler shaft assembly (702) are slidably arranged on both sides of the housing (701), and one end extends out of the housing (701), and the first idler shaft assembly (702) has two symmetrically distributed around the housing (701); A second idler shaft assembly (703), wherein two ends of the second idler shaft assembly (703) are slidably arranged on both sides of the housing (701), one end of the second idler shaft assembly (703) extends out of the housing (701) in a direction opposite to that of the first idler shaft assembly (702), and the second idler shaft assembly (703) has two ends that are symmetrically distributed with respect to the housing (701); A camshaft (704), wherein both ends of the camshaft (704) are rotatably disposed on the housing (701), the camshaft (704) passes through the two first idler shaft assemblies (702) and the two second idler shaft assemblies (703), and after the camshaft (704) rotates, the protruding end of the first idler shaft assembly (702) approaches or moves away from the protruding end of the second idler shaft assembly (703); A movable plate (705), wherein two movable plates (705) are provided, and the two movable plates (705) are arranged on both sides of the housing (701), one movable plate (705) is connected to the protruding end of the first idler shaft assembly (702), and the other movable plate (705) is connected to the protruding end of the second idler shaft assembly (703), and one end of the clamping member (8) is arranged on the movable plate (705); A locking handle (706), wherein the locking handle (706) is arranged at one end of the cam shaft (704), and the locking handle (706) is used to drive the cam shaft (704) to rotate.

6. A DR scanner according to claim 5, characterized in that: The camshaft (704) has cam lobes (7041) used in pairs, the cam lobes (7041) used in pairs are in opposite directions, and the first idler shaft assembly (702) comprises: A long shaft (7021), wherein both ends of the long shaft (7021) are slidably disposed on the housing (701), and one end extends out of the housing (701); the long shaft (7021) has a slide groove (7027), and the cam shaft (704) passes through the slide groove (7027); A linkage plate (7022), one end of the linkage plate (7022) being arranged on the long shaft (7021); A short shaft (7023), one end of the short shaft (7023) being arranged at the other end of the linkage plate (7022), the other end of the short shaft (7023) extending out of the housing (701) and sliding, and the movable plate (705) being arranged at the extending end of the short shaft (7023); A cam abutment block (7024), wherein the cam abutment block (7024) is slidably disposed on the long shaft (7021), and the cam abutment block (7024) has two cam abutment surfaces (7025). When the cam shaft (704) rotates, the cam protrusion (7041) abuts against one of the cam abutment surfaces (7025); A second elastic member (7026), wherein two ends of the second elastic member (7026) are respectively arranged on the long shaft (7021) and the cam abutment block (7024), and are used to provide a force for the cam abutment block (7024) to approach the linkage plate (7022).

7. A DR scanner according to claim 6, characterized in that: The second idler shaft assembly (703) has the same structure as the first idler shaft assembly (702).

8. A DR scanner according to claim 5, characterized in that: One end of the clamping member (8) is rotatably disposed on the movable plate (705).

9. A DR scanner according to claim 8, characterized in that: The clamping member (8) comprises: A mounting frame (801), one end of the mounting frame (801) being rotatably disposed on the movable plate (705); A guide column (802), one end of the guide column (802) being arranged on the mounting frame (801), and the other end of the guide column (802) being slidably arranged on the movable plate (705); An abutment wheel (803), the abutment wheel (803) being rotatably arranged on the mounting frame (801), the abutment wheel (803) abutting against and sliding on both sides of the track assembly (1).

Images