Rail joint grinding device

Abstract

The application relates to a rail joint polishing device which comprises a supporting assembly, a polishing amount adjusting assembly, a locking assembly, a transition connecting plate and a handheld polishing device; since the handheld polishing device is installed on an adjusting plate of the polishing amount adjusting assembly by the transition connecting plate, the polishing amount adjusting assembly comprises a base plate and an adjusting structure, and the adjusting plate is hinged on the base plate; in use, the supporting assembly can provide support for the handheld polishing device, so as to avoid the labor intensity of long-time hand holding by a construction worker; the locking assembly can fix the posture of the handheld polishing device; when the polishing amount needs to be adjusted, the locking assembly is loosened, then the angle of the adjusting plate relative to the base plate is adjusted by the adjusting structure, so that the distance between the handheld polishing device and the rail joint is changed; after the adjustment is completed, the locking assembly is locked and polishing is carried out; thus, the adjustment of the polishing amount and the stable polishing amount are realized, so that the target profile of the steel rail is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of track installation and maintenance, and in particular to a track joint polishing device. BACKGROUND

[0002] At present, for high-precision test trailer tracks, the track installation precision is very high, and the polishing precision after welding for the welded joints is also required to be very high. In addition, when the train runs on the track, a huge extrusion force and impact force are generated between the train wheels and the track. After long-term operation, various damages and abrasions occur on the surface of the train track, such as wavy abrasion of the track, track surface scratches, track surface peeling, track side wear, cracks, rail head crushing and fat edges, which not only affect the comfort of passengers, but also cause safety hazards to train operation. Therefore, the track of the train needs to be repaired regularly and irregularly by using polishing equipment.

[0003] The polishing equipment for the train track generally uses a large polishing car. The large polishing car mainly uses the combination polishing of multiple grinding wheels to ensure the profile of the steel rail, but has poor mobility and is difficult to transfer. A small polishing machine.

[0004] In some other related technologies, in order to improve the mobility, a handheld polishing machine is generally used for polishing, but manual polishing has the following problems:

[0005] The polishing needs to be completed by multiple back-and-forth operations on the track, and it is difficult to accurately control and maintain a stable polishing amount during the polishing process, so it is difficult to achieve the target profile of the steel rail; in addition, the manual polishing has a large labor intensity due to long-time manual operation.

[0006] Therefore, it is necessary to provide a supporting device which can move on the track and provide support for the handheld polishing machine, and can also adjust the posture of the handheld polishing machine to accurately adjust the polishing amount. SUMMARY

[0007] The embodiments of the present application provide a track joint polishing device to solve the problems in the related art that the handheld polishing machine needs to be operated back and forth on the track multiple times to complete the polishing, it is difficult to accurately control and maintain a stable polishing amount during the polishing process, and it is difficult to achieve the target profile of the steel rail; in addition, the manual polishing has a large labor intensity due to long-time manual operation.

[0008] In a first aspect, a track joint polishing device is provided, which includes:

[0009] a supporting assembly for being installed on a track;

[0010] The polishing amount adjusting assembly is installed on the supporting assembly and comprises a base plate and an adjusting structure, and the adjusting structure is hinged to the adjusting plate on the base plate;

[0011] The locking assembly is installed on the base plate and used for fixing the angle of the adjusting plate after the adjustment through the adjusting structure;

[0012] The transition connecting plate is installed on the adjusting plate and used for installing the handheld polishing device.

[0013] In some embodiments, the adjusting structure comprises:

[0014] The first linear movement mechanism has a movable first sliding block, and an inclined sliding hole is arranged on the side surface of the first sliding block, and the projection of the sliding hole on the base plate is parallel to the movement direction of the first sliding block;

[0015] The slide rod is arranged through the sliding hole, and connecting blocks are arranged at both ends of the slide rod and located on both sides of the first sliding block; the adjusting plate is provided with an accommodating groove for accommodating the first sliding block, and the connecting blocks are located on both sides of the accommodating groove and connected with the adjusting plate.

[0016] In some embodiments, the locking assembly comprises a connecting rod and a pressing nut; the connecting rod is fixedly connected with the base plate; the connecting rod is arranged through the adjusting plate, and two pressing nuts are arranged on the connecting rod and located on the upper and lower sides of the adjusting plate.

[0017] In some embodiments, two hinge seats are arranged on the base plate in a spaced manner, and a rotating shaft is detachably connected with the hinge seats through a butterfly nut, and the rotating shaft is arranged through the adjusting plate.

[0018] In some embodiments, the supporting assembly comprises a first platform and a second platform; the bottom of the first platform is provided with a clamping assembly for connecting with a track, and the second platform is an L-shaped platform having two perpendicular connecting planes;

[0019] The two connecting planes are detachably connected with the top of the first platform alternatively; the second linear movement mechanism is arranged on the second platform, connected with the base plate, and used for moving the base plate.

[0020] In some embodiments, the number of the transition connecting plates is two, and the transition connecting plates are alternatively connected with the adjusting plate;

[0021] One of the transition connecting plates is a long strip, and the other is an L-shaped plate; the connecting clamps are arranged on the two transition connecting plates and used for connecting with the handheld polishing device.

[0022] In some embodiments, the top of the first platform is provided with a first connecting screw hole;

[0023] The second connecting screw hole is arranged on the connecting plane; the second platform is connected with the first platform through the connecting screw and the first connecting screw hole and the second connecting screw hole.

[0024] In some embodiments, a reinforcing rib is arranged at the corner of the second platform.

[0025] A guide rail is arranged on one vertical surface of the second platform and located on both sides of the reinforcing rib, and a guide block is slidably arranged on the guide rail and fixedly connected with the base plate.

[0026] In some embodiments, the clamping assembly comprises:

[0027] A support plate is movably connected with the first platform.

[0028] A plurality of clamping claws are divided into two groups, and the clamping claws in each group are distributed along the length direction of the rail; the clamping claws in the two groups are fixed on the bottom of the support plate and located on both sides in the width direction of the rail to form a space for accommodating the rail; the clamping claws have an inclined abutting surface in contact with the rail.

[0029] In some embodiments, an avoiding groove is arranged on the support plate and extends from the end surface of the support plate to the rail in the length direction by a design length.

[0030] A second sliding block corresponding to the two groups of clamping claws is arranged on the support plate, a sliding rail is slidably arranged on the second sliding block, and the sliding rail is fixedly connected with the bottom of the first platform; the bottom of the first platform is provided with a limiting block located in the avoiding groove.

[0031] The technical scheme provided by the application has the beneficial effects of:

[0032] The handheld polishing device can be installed on the adjusting plate of the polishing amount adjusting assembly through the transition connecting plate, the polishing amount adjusting assembly is installed on the rail through the supporting assembly, the polishing amount adjusting assembly comprises a base plate and an adjusting structure, the adjusting plate is hingedly connected to the base plate, the adjusting structure is located between the base plate and the adjusting plate, the locking assembly is installed on the base plate and is used for fixing the angle of the adjusting plate after the adjusting structure is adjusted, in use, the supporting assembly can provide support for the handheld polishing device, thereby avoiding the labor intensity of the construction personnel for a long time, and the locking assembly can fix the posture of the handheld polishing device, when the polishing amount needs to be adjusted, the locking assembly is loosened, and then the angle of the adjusting plate relative to the base plate is adjusted by using the adjusting structure, so that the distance between the handheld polishing device and the rail joint is changed, after the adjustment is completed, the locking assembly is locked, and then polishing is performed, so that the adjustment of the polishing amount and the stable polishing amount are realized, and the target profile of the steel rail is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0034] Figure 1 The rail joint grinding device provided by the embodiments of the present application is ground along the length direction of the rail;

[0035] Figure 2 The rail joint grinding device provided by the embodiments of the present application is ground along the width direction of the rail;

[0036] Figure 3 The structural schematic diagram of the support assembly provided by the embodiments of the present application is shown;

[0037] Figure 4 The structural schematic diagram of the support assembly provided by the embodiments of the present application is shown;

[0038] Figure 5 The structural schematic diagram of the second platform and the second linear movement mechanism thereon provided by the embodiments of the present application is shown.

[0039] In the figure: 1, support assembly; 100, first platform; 101, second platform; 102, clamping assembly; 1021, clamping jaw; 1022, support plate; 1023, sliding rail; 1024, limiting block; 103, second linear movement mechanism; 104, reinforcing rib; 105, guide rail; 106, guide block; 2, rail; 3, grinding amount adjusting assembly; 300, base plate; 301, adjusting structure; 3010, first linear movement mechanism; 3011, first sliding block; 3012, sliding hole; 3013, sliding rod; 3014, connecting block; 302, adjusting plate; 303, hinge seat; 4, locking assembly; 400, connecting rod; 401, compression nut; 5, transition connecting plate; 6, handheld grinding device; 7, connecting clamp. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] The embodiment of the present application provides a rail joint polishing device to solve the problem that a handheld polisher needs to be operated on a rail multiple times to complete polishing, the polishing amount is difficult to be accurately controlled and a stable polishing amount is difficult to be maintained, and the target profile of a rail is difficult to be achieved in the related art; in addition, when polishing is performed manually, the problem of high labor intensity of long-time manual operation of a worker.

[0042] Please refer to Figures 1-5 The rail joint polishing device comprises a support assembly 1, a polishing amount adjusting assembly 3, a locking assembly 4, a transition connecting plate 5 and a handheld polishing device 6.

[0043] The support assembly 1 is used to be installed on a rail 2 and provides an installation position for the polishing amount adjusting assembly 3; the polishing amount adjusting assembly 3 comprises a base plate 300 and an adjusting structure 301, the base plate 300 is hinged with an adjusting plate 302, and the adjusting structure 301 is located between the base plate 300 and the adjusting plate 302; the locking assembly 4 is installed on the base plate 300 and is used to fix the angle of the adjusting plate 302 after the adjusting plate 302 is adjusted by the adjusting structure 301. The transition connecting plate 5 is installed on the adjusting plate 302 and is used to install the handheld polishing device 6.

[0044] Since the handheld polishing device 6 can be installed on the adjusting plate 302 of the polishing amount adjusting assembly 3 through the transition connecting plate 5, and the polishing amount adjusting assembly 3 is installed on the rail 2 through the support assembly 1; the polishing amount adjusting assembly 3 comprises the base plate 300 and the adjusting structure 301, and the base plate 300 is hinged with the adjusting plate 302; the adjusting structure 301 is located between the base plate 300 and the adjusting plate 302, and the locking assembly 4 is installed on the base plate 300 and is used to fix the angle of the adjusting plate 302 after the adjusting plate 302 is adjusted by the adjusting structure 301; in use, the support assembly 1 can provide support for the handheld polishing device 6 to avoid the labor intensity of long-time manual operation of a worker; the locking assembly 4 can fix the posture of the handheld polishing device 6; when the polishing amount needs to be adjusted, the locking assembly 4 is loosened, and then the angle of the adjusting plate 302 relative to the base plate 300 is adjusted by using the adjusting structure 301 to change the distance of the handheld polishing device 6 relative to the rail joint; after the adjustment is completed, the polishing is performed after the locking assembly 4 is locked; thereby the adjustment of the polishing amount and the maintenance of the stable polishing amount are realized to achieve the target profile of the rail.

[0045] In some preferred embodiments, the adjusting structure 301 is described in detail, and specifically:

[0046] The adjusting structure 301 comprises a first linear movement mechanism 3010, a first sliding block 3011, a sliding hole 3012, a sliding rod 3013 and a connecting block 3014.

[0047] The first linear moving mechanism 3010 has a movable first slider 3011, the side surface of the first slider 3011 is provided with an inclined sliding hole 3012, the projection of the sliding hole 3012 on the base plate 300 is parallel to the moving direction of the first slider 3011; a sliding rod 3013 is arranged through the sliding hole 3012, and the two ends of the sliding rod 3013 are provided with connecting blocks 3014 located on the two sides of the first slider 3011; the adjusting plate 302 is provided with an accommodating groove for accommodating the first slider 3011; the connecting blocks 3014 are located on the two sides of the accommodating groove and are connected with the adjusting plate 302.

[0048] Since the sliding rod 3013 is fixedly connected with the adjusting plate 302 through the connecting blocks 3014, when adjustment is needed, the first slider 3011 on the first linear moving mechanism 3010 moves, and then cooperates with the inclined sliding hole 3012 to change the height of the sliding rod 3013 in the vertical direction, so as to realize the hinged rotation of the adjusting plate 302. The first linear moving mechanism 3010 can adopt a lead screw structure, which has the characteristics of accurate adjustment amount.

[0049] Further, the base plate 300 is provided with two spaced-apart hinge seats 303, the two hinge seats 303 are provided with rotating shafts which are detachably connected through butterfly nuts, the rotating shafts pass through the adjusting plate 302 and extend along the width direction of the adjusting plate 302. Such a hinged structure facilitates installation and disassembly while being hinged.

[0050] In some preferred embodiments, the locking assembly 4 includes a connecting rod 400 and a compression nut 401; the connecting rod 400 is fixedly connected with the base plate 300; the connecting rod 400 passes through the adjusting plate 302 and is provided with two compression nuts 401 thereon, the two compression nuts 401 are located on the upper and lower sides of the adjusting plate 302 respectively; the position of the adjusting plate 302 is fixed by rotating the compression nut 401 on the connecting rod 400.

[0051] In some preferred embodiments, in the actual use process, the polishing of the vertical surface and the horizontal surface at the track joint is needed, so the posture of the handheld polishing device 6 needs to be adjusted, and therefore the structure of the supporting assembly 1 is described.

[0052] The supporting assembly 1 includes a first platform 100 and a second platform 101; the bottom of the first platform 100 is provided with a clamping assembly 102 for connecting with the track 2, and the second platform 101 is an L-shaped platform which has two mutually perpendicular connecting planes;

[0053] The two connecting planes are detachably connected with the top of the first platform 100 alternatively; the second platform 101 is provided with a second linear moving mechanism 103, the second linear moving mechanism 103 is connected with the base plate 300 and is used for moving the base plate 300.

[0054] There are two transition connecting plates 5, and one of them is connected to the adjusting plate 302; one of the transition connecting plates 5 is long and the other is L-shaped; both transition connecting plates 5 are provided with connecting clamps 7, which are used to connect with the hand-held grinding device 6.

[0055] refer to Figure 1 The image shows the posture for grinding the vertical surface of the track joint using a handheld grinding device 6. In this case, the handheld grinding device 6 is vertically set with the track 2, and the second linear movement mechanism 103 is vertically set with the first platform 100. If the handheld grinding device 6 is directly connected to the adjustment plate 302, it will be located directly above the track and will not be able to grind the vertical surface. Therefore, the transition connecting plate 5 needs to be set in an L-shape so that there is a set distance between the handheld grinding device 6 and the adjustment plate 302. Then, the second linear movement mechanism 103 can be used to move up and down to grind the vertical surface of the handheld grinding device 6.

[0056] refer to Figure 2 The image shows the posture of using a handheld polishing device 6 to polish the horizontal surface of the track joint. In this case, the handheld polishing device 6 is set parallel to the top surface of the track; the second linear movement mechanism 103 is set horizontally with the first platform 100; the second linear movement mechanism 103 moves in the horizontal plane to polish the horizontal surface of the handheld polishing device 6.

[0057] In some preferred embodiments, the detachable connection between the first platform 100 and the second platform 101 can be as follows:

[0058] The top of the first platform 100 is provided with a first connecting screw hole;

[0059] The connecting plane is provided with a second connecting screw hole; the second platform 101 is connected to the first platform 100 by connecting screws, as well as the first connecting screw hole and the second connecting screw hole.

[0060] Furthermore, a reinforcing rib 104 is provided at the corner of the second platform 101;

[0061] On one of the vertical surfaces of the second platform 101, and on both sides of the reinforcing rib 104, there are guide rails 105. Guide blocks 106 slide on the guide rails 105 and are fixedly connected to the substrate 300, so that the movement of the substrate 300 is stable and does not deviate.

[0062] In some preferred embodiments, reference Figure 4 and Figure 5The clamping assembly 102 comprises a supporting plate 1022 and a plurality of clamping claws 1021; the supporting plate 1022 is movably connected with the first platform 100; the plurality of clamping claws 1021 are divided into two groups, and the clamping claws 1021 in each group are distributed along the length direction of the track 2; the two groups of clamping claws 1021 are fixed at the bottom of the supporting plate 1022 and located on both sides in the width direction of the track 2 to form a space for accommodating the track 2; the clamping claws 1021 have an inclined abutting surface in contact with the track 2.

[0063] The supporting plate 1022 is movably connected with the first platform 100 in the following manner:

[0064] The supporting plate 1022 is provided with an avoiding groove extending from the end surface of the supporting plate 1022 to the length direction of the track 2 by a design length, and the design length is less than the length of the supporting plate 1022; the supporting plate 1022 is fixedly connected with a second sliding block corresponding to the two groups of clamping claws 1021, a sliding rail 1023 is slidably arranged on the second sliding block, and the sliding rail 1023 is fixedly connected with the bottom of the first platform 100; the bottom of the first platform 100 is provided with a limiting block 1024 located in the avoiding groove.

[0065] With the above arrangement, the entire second platform 101 can move relative to the track, facilitating the movement of the handheld polishing device 6 during use, thereby reducing the labor intensity of long-time handheld polishing.

[0066] The principle of the present application is as follows:

[0067] Since the handheld polishing device 6 can be installed on the adjusting plate 302 of the polishing amount adjusting assembly 3 through the transition connecting plate 5, and the polishing amount adjusting assembly 3 is installed on the track 2 through the supporting assembly 1; the polishing amount adjusting assembly 3 comprises a base plate 300 and an adjusting structure 301, and the adjusting plate 302 is hingedly connected to the base plate 300; the adjusting structure 301 is located between the base plate 300 and the adjusting plate 302, the locking assembly 4 is installed on the base plate 300 and used for fixing the angle of the adjusting plate 302 after being adjusted by the adjusting structure 301; during use, the supporting assembly 1 can provide support for the handheld polishing device 6 to avoid the labor intensity of long-time handheld operation by the construction personnel; the locking assembly 4 can fix the posture of the handheld polishing device 6; when the polishing amount needs to be adjusted, the locking assembly 4 is loosened, and then the angle of the adjusting plate 302 relative to the base plate 300 is adjusted by using the adjusting structure 301 to change the distance of the handheld polishing device 6 relative to the track joint; after the adjustment is completed, the polishing is performed after the locking assembly 4 is locked; thereby the adjustment of the polishing amount and the maintenance of the stable polishing amount are realized to achieve the target profile of the steel rail.

[0068] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] It should be noted that in the present application, relational terms such as "first" and "second", and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0070] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A rail joint grinding device, characterized in that, The utility model relates to a track joint polishing device which comprises the following parts: a support assembly (1) for being mounted on a track (2); a polishing amount adjusting assembly (3) mounted on the support assembly (1) and comprising a base plate (300) and an adjusting structure (301), the adjusting structure (301) being located between the base plate (300) and an adjusting plate (302) hinged to the base plate (300); a locking assembly (4) mounted on the base plate (300) and used for fixing the angle of the adjusting plate (302) adjusted through the adjusting structure (301); a transition connecting plate (5) mounted on the adjusting plate (302) and used for mounting a handheld polishing device (6); the adjusting structure (301) comprises a first linear movement mechanism (3010) having a movable first slider (3011), the side surface of the first slider (3011) being provided with an inclined sliding hole (3012), the projection of the sliding hole (3012) on the base plate (300) being parallel to the moving direction of the first slider (3011); a slide rod (3013) penetrating through the sliding hole (3012) and provided at both ends with connecting blocks (3014) located on both sides of the first slider (3011); the adjusting plate (302) is provided with a receiving groove accommodating the first slider (3011), and the connecting blocks (3014) are located on both sides of the receiving groove and connected with the adjusting plate (302); the support assembly (1) comprises a first platform (100) and a second platform (101); the bottom of the first platform (100) is provided with a clamping assembly (102) for being connected with the track (2), and the second platform (101) is an L-shaped platform having two mutually perpendicular connecting planes; the two connecting planes are detachably connected with the top of the first platform (100) alternatively; the second platform (101) is provided with a second linear movement mechanism (103) connected with the base plate (300) and used for moving the base plate (300).

2. The track joint polishing device according to claim 1, wherein: the locking assembly (4) comprises a connecting rod (400) and a pressing nut (401); the connecting rod (400) is fixedly connected with the base plate (300); the connecting rod (400) penetrates through the adjusting plate (302) and is provided at both ends with two pressing nuts (401), and the two pressing nuts (401) are located on the upper and lower sides of the adjusting plate (302) respectively.

3. The track joint polishing device according to claim 1, wherein: the base plate (300) is provided with two spaced-apart hinge seats (303), and the hinge seats (303) are provided with rotating shafts detachably connected through butterfly nuts, and the rotating shafts penetrate through the adjusting plate (302).

4. The track joint polishing device according to claim 1, wherein: the number of the transition connecting plates (5) is two, and the transition connecting plates (5) are alternatively connected with the adjusting plate (302). One of the transition connecting plates (5) is long strip-shaped, and the other transition connecting plate (5) is L-shaped; both of the transition connecting plates (5) are provided with a connecting clamp (7) for connecting with the handheld polishing device (6).

5. The rail joint polishing device of claim 1, wherein: The top of the first platform (100) is provided with a first connecting screw hole; The connecting plane is provided with a second connecting screw hole; the second platform (101) is connected with the first platform (100) through a connecting screw and the first connecting screw hole and the second connecting screw hole.

6. The rail joint polishing device of claim 1, wherein: The corner of the second platform (101) is provided with a reinforcing rib (104); One of the vertical surfaces of the second platform (101) and located on both sides of the reinforcing rib (104) is provided with a guide rail (105), and the guide rail (105) is slidably provided with a guide block (106), and the guide block (106) is fixedly connected with the base plate (300).

7. The rail joint grinding apparatus of claim 1, wherein, The clamping assembly (102) comprises: A support plate (1022) movably connected with the first platform (100); A plurality of clamping claws (1021) are divided into two groups, and the clamping claws (1021) in each group are distributed along the length direction of the rail (2); the two groups of clamping claws (1021) are fixed on the bottom of the support plate (1022) and located on both sides in the width direction of the rail (2) to form a space for accommodating the rail (2); the clamping claws (1021) have an inclined abutting surface in contact with the rail (2).

8. The rail joint polishing device of claim 7, wherein: The support plate (1022) is provided with an avoiding groove extending from the end surface of the support plate (1022) to the design length in the length direction of the rail (2); The support plate (1022) is provided with a second sliding block corresponding to the two groups of clamping claws (1021), and the second sliding block is slidably provided with a sliding rail (1023), and the sliding rail (1023) is fixedly connected with the bottom of the first platform (100); the bottom of the first platform (100) is provided with a limiting block (1024) located in the avoiding groove.

Images