Portable rail damage welding repair equipment

Abstract

The application provides a portable rail damage welding repair device, which comprises a frame body, a first walking assembly and a second walking assembly arranged on the frame body, and a welding repair assembly. The first walking assembly is used for contacting and walking along the rail. The second walking assembly is used for contacting and walking along the ground or a track plate plane. The welding repair assembly comprises a welding repair adjusting mechanism and a welding head connected with the welding repair adjusting mechanism. The welding head is used for welding repair of the rail. The first walking assembly and the second walking assembly are matched to move along the rail damage line. The welding repair assembly is used for welding repair of the rail damage. The angle of the welding head is adjusted by the welding repair adjusting mechanism, so that the welding head is aligned with the damage position for welding repair operation. The problems of time-consuming, laborious and safety caused by manual welding repair are avoided. The efficiency and reliability of the rail damage welding repair are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of railway track engineering, in particular to a portable rail damage welding repair device. BACKGROUND

[0002] The seamless line has become an inevitable trend of railway development. Compared with the ordinary line, the seamless line can save at least 15% of the conventional maintenance cost and prolong the service life of the rail by 25%. In addition, the seamless line also has the advantages of reducing the driving resistance, reducing the driving vibration and noise, etc. Through the phase analysis of the damaged parts of the online seamless rail in China, it is found that there are two reasons for the damage of the rail: one is the damage caused by the quality of the rail itself, which not only seriously endangers the driving safety, but also cannot be repaired and can only be replaced with new rails. The other damage is caused by the rail in normal operation. The huge impact load when the train passes through promotes the continuous development of the crack at the damaged part to form a rail head transverse fatigue crack, mainly manifested as rail surface spalling, wave-shaped wear, rail head crushing, crack and rail surface fracture, etc.

[0003] For the repair of small and medium-sized damage of the rail of the general line, the flexible, convenient and low-cost welding rod manual arc welding is usually used for repair, which needs to determine the position of the damage to be repaired and then manually hold the welding head to complete the repair. However, the existing welding repair equipment is often directly carried by maintenance personnel, which is time-consuming and laborious when moving, and the maintenance personnel need to hold the welding head to repeatedly repair the damaged part of the rail horizontally during work. The welding repair quality is easily limited by the influence of manual work, and the maintenance personnel holding the welding head may cause a series of unsafe factors. SUMMARY

[0004] The purpose of the present application is to provide a portable rail damage welding repair device to automatically complete the repair of the rail welding and improve the efficiency and reduce the labor intensity.

[0005] In order to achieve the above purpose, the present application provides a portable rail damage welding repair device, which comprises a frame body, a first walking assembly and a second walking assembly arranged on the frame body, and a welding repair assembly. The first walking assembly is used to contact and walk with the rail, the second walking assembly is used to contact and walk with the ground or the track plate plane, and the welding repair assembly comprises a welding repair adjusting mechanism and a welding head connected with the welding repair adjusting mechanism. The welding head is used for welding repair of the rail.

[0006] Further, the welding repair adjusting mechanism comprises a connecting rod, the first end of the connecting rod is connected with a rotating adjusting module, the second end of the connecting rod is connected with an extension rod, and the welding head is installed at the end of the extension rod.

[0007] Further, the rotation adjustment module comprises a moving block connected with the first end of the connecting rod, a gear is arranged on the moving block, a fixed ring in the shape of a ring is arranged on the frame body, the fixed ring is formed with a rack, the rack is engaged with the gear, and the gear is driven by a rotation driving part on the moving block.

[0008] Further, screw grooves and a placing groove are arranged on the moving block, the screw grooves are two in number and are symmetrically arranged on the front and rear sides of the moving block relative to the placing groove, the first end of the connecting rod is placed in the placing groove, a limiting plate is fixed to the position close to the first end of the connecting rod, and the limiting plate is selectively fixed in one of the two screw grooves by bolts to adjust the position of the connecting rod.

[0009] Further, the rotation driving part is a rotary motor.

[0010] Further, the fixed ring is arranged above the frame body, the two bottom end corners of the fixed ring are supported by support plates, and the support plates are fixed to the side walls of the frame body.

[0011] Further, the first walking assembly comprises a rotating rod fixed in the inner cavity of the frame body, a roller is rotatably arranged on the rotating rod, and the roller is in rolling contact with the upper surface of the steel rail.

[0012] Further, the first walking assembly comprises a screw rod connected with the frame body, a first sleeve column is fixed to the end of the screw rod, a first sliding block and a first spring are arranged in the inner cavity of the first sleeve column, the first sliding block is elastically connected with the first sleeve column through the first spring, the first sliding block is connected with the first end of a first sliding rod, a clamping block is fixed to the second end of the first sliding rod, a plurality of rolling balls are rotatably arranged on the inner side of the clamping block, the rolling balls are in rolling contact with the side wall of the steel rail, two groups of screw rods are symmetrically arranged relative to the frame body, and the fixed positions of the screw rods relative to the frame body are adjustable.

[0013] Further, the second walking assembly comprises a second sleeve column, a second spring and a second sliding block are arranged in the inner cavity of the second sleeve column, the second sliding block is elastically connected with the second sleeve column through the second spring, the second sliding block is connected with the first end of a second sliding rod, a fixed plate is connected to the second end of the second sliding rod, the fixed plate is connected with the first end of a supporting rod, a rolling wheel is rotatably connected to the second end of the supporting rod, and two groups of fixed plates are symmetrically arranged relative to the frame body.

[0014] Further, a welding repair cabinet is arranged on the frame body, the welding repair cabinet is used for adjusting welding repair parameters, and a handle is mounted to the rear side of the frame body, and the handle is used for pushing the device.

[0015] The above scheme of the present application has the following beneficial effects:

[0016] The portable rail damage welding repair equipment provided by the present application can move along the rail damage line by cooperation of the first walking assembly and the second walking assembly, and the welding repair assembly is used to complete the welding repair of the rail damage, and the welding head is adjusted by the welding adjustment mechanism to align with the damage position for welding repair operation, thereby avoiding the time-consuming and laborious and safety problems caused by manual welding repair, and improving the efficiency and reliability of the rail damage welding repair;

[0017] In the present application, the ball on the clamping block is attached to the side of the rail by rotating the screw rod to drive the clamping block to move forward, so that the welding repair equipment can be quickly erected on the rail, and the distance between the left and right clamping blocks can be freely adjusted to clamp different types of rails, facilitating the fixation of the equipment on different specifications of lines, improving the universality of the equipment, and using the elasticity of the first spring in the first set of columns at the top end of the screw rod to attach the ball to the rail, facilitating the free sliding of the equipment on the curved rail, improving the smoothness of the guidance of the equipment, facilitating the pushing of the operator, and improving the work efficiency;

[0018] In the present application, the gear is driven to rotate by starting the driving motor, the gear is engaged on the rack of the fixed ring, so that the moving block slides on the fixed ring in a semicircle to adjust the direction of the welding head on the connecting rod, thereby increasing the welding repair range of the welding head, and the different types of damage of the rail can be welded and repaired, improving the applicability and universality of the equipment body, and reducing the unsafe factors caused by the manual holding of the welding head by the maintenance personnel;

[0019] In the present application, the welding head connected on the connecting rod can be retracted to the inside to reduce the volume of the welding repair equipment, facilitate the storage and transportation of the equipment, and facilitate the movement of the equipment by the second walking assembly without the need for manual lifting, thereby improving the work efficiency;

[0020] Other beneficial effects of the present application will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 It is a front view of the overall structure of the present application;

[0023] Figure 3 It is a side view of the overall structure of the present application;

[0024] Figure 4 It is an enlarged view of A of Figure 2 ;

[0025] Figure 5 It is an enlarged view of B of Figure 2 ;

[0026] Figure 6 For Figure 3 Enlarged view at C of Fig.

[0027]

BRIEF DESCRIPTION OF DRAWINGS

[0028] 1-frame; 2-rail; 3-welding head; 4-welding cabinet; 5-push handle; 6-connecting rod; 7-telescopic rod; 8-moving block; 9-gear; 10-fixed ring; 11-thread groove; 12-placing groove; 13-limiting plate; 14-bolt; 15-rotary motor; 16-connecting plate; 17-supporting plate; 18-rotating rod; 19-roller; 20-screw rod; 21-first sleeve column; 22-first sliding block; 23-first spring; 24-first sliding rod; 25-clamping block; 26-rolling ball; 27-second sleeve column; 28-second spring; 29-second sliding block; 30-second sliding rod; 31-fixed plate; 32-supporting rod; 33-roller. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In the specific embodiments, various specific technical features and embodiments can be combined in any appropriate manner without contradiction, for example, different specific technical features / embodiments can form different embodiments through combination. In order to avoid unnecessary repetition, various possible combination manners of the various specific technical features / embodiments in the present application will not be described again.

[0030] It should be noted that the terms "arranged", "connected" should be understood broadly, for example, can be directly arranged, installed, connected, or indirectly arranged, connected through a centering component, centering structure. In addition, the "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like in the present application indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the conventional placement state or use state, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structures, features, 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.

[0031] As Figures 1-3As shown, the embodiment of the present application provides a portable rail damage welding repair device, which comprises a frame body 1, a first walking assembly and a second walking assembly arranged on the frame body 1, and a welding repair assembly. The first walking assembly is used to contact and walk along the rail 2, the second walking assembly is used to contact and walk along the ground or the track plate plane, and the welding repair assembly comprises a welding repair adjusting mechanism and a welding head 3 connected with the welding repair adjusting mechanism. The welding head 3 is used to weld and repair the rail 2, and the position and angle of the welding head are adjusted by the welding repair adjusting mechanism, so that the welding head 3 accurately docks the part of the rail 2 to be welded and repaired.

[0032] In the embodiment, the welding repair cabinet 4 is arranged on the frame body 1, and the welding repair cabinet 4 is used as a control part to adjust the welding repair parameters. The position and angle of the welding head 3 can be set and adjusted, and a visual module and the like can be additionally provided and controlled to automatically adjust the welding repair adjusting mechanism.

[0033] In the embodiment, the push handle 5 is installed at the rear side of the frame body 1, and the push handle 5 is used to push the device. That is, the first walking assembly and the second walking assembly do not have driving force by themselves, and only rollingly contact the rail 2, the ground or the track plate plane and the like. The device moves forward by relying on the pushing force. However, the first walking assembly and the second walking assembly can be further improved to have driving force by themselves, so that the rail 2 damage welding repair can be more conveniently and safely completed.

[0034] In the embodiment, the welding repair adjusting mechanism comprises a connecting rod 6. The connecting rod 6 is in an inverted L shape, the first end of the connecting rod 6, that is, the bottom end of the inverted L shape, is connected with a rotary adjusting module, which is used to adjust the angle of the connecting rod 6, and the second end of the connecting rod 6 is connected with an extension rod 7. The welding head 3 is installed at the end of the extension rod 7, and the distance between the welding head 3 and the rail 2 is adjusted by the extension rod 7 to meet the adjustment requirements of the rail 2 welding repair.

[0035] Specifically, the rotary adjusting module comprises a moving block 8 connected with the first end of the connecting rod 6. The moving block 8 is arranged with a gear 9, and the frame body 1 is arranged with a fixed ring 10 in an annular shape. The fixed ring 10 is formed with equidistant gear racks, the gear racks are engaged with the gear 9, and the gear 9 is driven by a rotary driving part on the moving block 8. Therefore, on the one hand, the moving block 8 is movably connected with the fixed ring 10, and the fixed ring 10 is arranged in the through holes on both sides of the moving block 8. On the other hand, when the rotary driving part drives the gear 9 to rotate, power is provided to move the moving block 8 along the fixed ring 10, so that the angle of the welding head 3 is adjusted.

[0036] It should be noted that the fixed ring 10 is symmetrical relative to the axis of the frame body 1, and the center of the rail 2 is usually located on the center line of the frame body 1, so the welding head 3 can be adjusted symmetrically relative to the rail 2. As preferred, the fixed ring 10 in this embodiment is a semicircular ring, so the welding head 3 can be adjusted to an orientation close to 180 degrees, increasing the welding range of the welding head 3, and different types of damage to the rail 2 can be welded and repaired, improving the applicability and versatility of the device body.

[0037] At the same time, as shown in Figure 6 Because the connecting rod 6 is in an inverted L shape, the connecting rod 6, the telescopic rod 7, and the part of the welding head 3 extending out of the frame body 1 are relatively long in length, so the longitudinal size of the entire device is relatively long, and it is inconvenient to transport and store. Based on this, as a further improvement, a threaded groove 11 and a placement groove 12 are formed in the moving block 8, the placement groove 12 is located at the center of the moving block 8, the number of threaded grooves 11 is two, and they are symmetrically distributed on the front and rear sides of the moving block 8, the first end of the connecting rod 6 is placed in the placement groove 12, and a limiting plate 13 is welded and fixed to the position close to the first end of the connecting rod 6, the limiting plate 13 is provided with a threaded hole, and the connecting rod 6 has different angles and is positioned by being selectively fixed to one of the two threaded grooves 11 by a bolt 14.

[0038] Therefore, in the working state of the device, the limiting plate 13 is fixed in the threaded groove 11 on the front side by the bolt 14, so that the upper part of the connecting rod 6, the telescopic rod 7, and the welding head 3 extend outward. When it needs to be stored, the bolt 14 is loosened, the connecting rod 6 is rotated by 180 degrees, and then the limiting plate 13 is fixed in the threaded groove 11 on the rear side by the bolt 14, so that the upper part of the connecting rod 6, the telescopic rod 7, and the welding head 3 are retracted to the inside, reducing the overall longitudinal volume occupied by the device and facilitating the storage and transportation of the device.

[0039] Preferably, the upper part of the connecting rod 6 is higher than the height of the welding cabinet 4, so that the connecting rod 6 is not hindered when it is rotated and retracted.

[0040] Of course, as a more preferred embodiment, the connecting rod 6 and the moving block 8 can also be automatically adjusted by a rotating mechanism, without the need for manual adjustment by loosening and tightening the bolt 14 twice, which is a subsequent optimization direction.

[0041] In this embodiment, the rotating drive part is a rotating motor 15. The rotating motor 15 is arranged on the lower surface of the moving block 8 and is fixed to the connecting plate 16 on one side of the lower surface of the moving block 8. The output shaft of the rotating motor 15 is connected to the gear 9, and a servo motor is preferably used to accurately control the welding angle of the welding head 3.

[0042] Of course, in other embodiments, other driving methods can also be used, which are not limited here.

[0043] In the embodiment, the fixed ring 10 is arranged above the frame body 1, and the two bottom end corners of the fixed ring 10 are supported by the support plates 17 and are welded and fixed with the support plates 17, and the support plates 17 are welded and fixed on the side wall of the frame body 1 and are symmetrically distributed relative to the central axis of the frame body 1.

[0044] In the embodiment, the first walking assembly includes a rotating rod 18 fixed in the inner cavity of the frame body 1, and a roller 19 is rotatably arranged on the rotating rod 18, and the roller 19 is in rolling contact with the upper surface of the steel rail 2, so that the roller 19 rolls on the upper surface of the steel rail 2 when the device is pushed forward.

[0045] As a preferred embodiment, the length of the roller 19 is greater than the width of the top surface of the steel rail 2, so that the overall support of the device is more stable and the movement is more convenient. In addition, the rotating rod 18 and the roller 19 can be arranged in multiple groups at equal intervals along the front and back of the frame body 1 and in a straight line, so as to more fully support the overall device.

[0046] Meanwhile, as shown in Figure 4 The first walking assembly further includes a screw rod 20 connected with the frame body 1, the screw rod 20 has a first sleeve column 21 fixed at the end thereof, the inner cavity of the first sleeve column 21 is arranged with a first sliding block 22 and a first spring 23, the first sliding block 22 is elastically and slidably connected with the first sleeve column 21 through the first spring 23, the first sliding block 22 is connected with the first end of a first sliding rod 24, the second end of the first sliding rod 24 is fixed with a clamping block 25, the inner side of the clamping block 25 is rotatably arranged with a ball 26, and the ball 26 is in rolling contact with the side wall of the steel rail 2. The arrangement of the first spring 23 and the ball 26 makes the movement and turning of the frame body 1 along the steel rail 2 more smooth.

[0047] Among them, the screw rod 20 is symmetrically arranged in two groups relative to the frame body 1, and a screw hole is formed on the frame body 1, and the screw rod 20 is inserted into the screw hole, and the fixed position of the screw rod 20 relative to the frame body 1 is adjustable, so that the distance between the two clamping blocks 25 can be freely adjusted to clamp different types of steel rails 2, which facilitates the movement and fixation of the device on different specifications of steel rails 2 and improves the versatility of the device.

[0048] As a preferred embodiment, each group of screw rods 20 on one side of the frame body 1 includes two screw rods 20, i.e., each side has two clamping blocks 25, and two balls 26 are installed on each clamping block 25, so that the frame body 1 can stably move, turn and work along the steel rail 2.

[0049] Meanwhile, as shown in Figure 5As shown, the second walking assembly comprises a second sleeve column 27, an inner cavity of the second sleeve column 27 is arranged with a second spring 28 and a second sliding block 29, the second sliding block 29 is elastically and slidingly connected with the second sleeve column 27 through the second spring 28, the second sliding block 29 is connected with a first end of a second sliding rod 30, a second end of the second sliding rod 30 is connected with a fixed plate 31, the fixed plate 31 is connected with a first end of a supporting rod 32, a second end of the supporting rod 32 is rotatably connected with a roller 33, the roller 33 is mainly used for rolling contact with the ground or the track plate plane.

[0050] Among them, the number of fixed plates 31, supporting plates 32 and rollers 33 is four, two groups are symmetrically arranged relative to the frame body 1, and are respectively located at four end corners of lower parts of two sides of the frame body 1, the number of second sleeve columns 27, second springs 28, second sliding blocks 29 and second sliding rods 30 is eight, and two groups are respectively connected at upper and lower ends of side surfaces of the fixed plate 31, and are connected with side walls of the frame body 1 to form a triangular structure, the elasticity of the second spring 28 is used to make each roller 33 form an independent suspension structure, and the movement on different terrains is suitable. When the roller 33 moves outward, the second sliding rod 30 slides outward on the second sleeve column 27, compresses the second spring 28 to one side, and elastically buffers the shaking by using the second spring 28; when the roller 33 moves inward, the second spring 28 is compressed to the other side to elastically buffer the inward shaking; when the roller 33 moves up and down, since the second sleeve column 27 and the second sliding rod 30 are both rotatably connected, the two second sliding rods 30 slide in opposite directions in the second sleeve column 27, and the second spring 28 can buffer the up-and-down shaking.

[0051] During the use of the device, the push handle 5 is pulled, the rollers 33 of the second walking assembly of the device are in rolling contact with the ground or the track plate plane, so that the device can be quickly moved, and the independent suspension structure can be used to move on different terrains, facilitating the use of the device. When reaching the damaged position of the steel rail, the device is first sleeved on the steel rail 2, so that the roller 19 of the first walking assembly in the frame body 1 contacts the top of the steel rail 2, then the screw rod 20 is rotated to drive the clamping block 25 to move inward, so that the ball 26 on the clamping block 25 contacts the side of the steel rail 2, and the first spring 23 is elastically attached to the steel rail 2, and the device is conveniently guided and moved on the curved steel rail. After the device is erected, the screw bolt 14 is rotated to be separated from the rear threaded groove 11, then the connecting rod 6 is rotated by 180 degrees, the screw bolt 14 on the limiting plate 13 is aligned with the front threaded groove 11, and the screw bolt 14 is screwed in, so that the position of the connecting rod 6 is fixed, and the welding head 3 connected to the connecting rod 6 faces outward, facilitating the repair work. Then, the damaged position of the steel rail 2 is confirmed, the rotating motor 15 is started to drive the gear 9 to rotate, the gear 9 is engaged with the rack of the fixed ring 10, so that the moving block 8 slides on the fixed ring 10 in a semicircle, the orientation of the telescopic rod 7 on the connecting rod 6 is adjusted, the damaged position is aligned, the telescopic rod 7 is started to drive the welding head 3 to move downward to repair the damage, when the repair is completed, the telescopic rod 7 is returned to the original position, the screw bolt 14 is loosened, the connecting rod 6 is rotated by 180 degrees, the screw bolt 14 is screwed into the rear threaded groove 11, and the return is completed, reducing the transportation volume of the device.

[0052] The above describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A portable rail damage welding repair apparatus, characterized by, The utility model relates to a welding repair device for rail, which comprises a frame (1), a first walking assembly and a second walking assembly arranged on the frame (1), and a welding repair assembly, the first walking assembly is used for contacting and walking with a rail (2), the second walking assembly is used for contacting and walking with the ground or a track slab plane, and the welding repair assembly comprises a welding repair adjusting mechanism and a welding head (3) connected with the welding repair adjusting mechanism, and the welding head (3) is used for welding repair of the rail (2). The welding repair adjusting mechanism comprises a connecting rod (6), a first end of the connecting rod (6) is connected with a rotary adjusting module, a second end of the connecting rod (6) is connected with a telescopic rod (7), and the welding head (3) is installed at the end of the telescopic rod (7). The rotary adjusting module comprises a moving block (8), the moving block (8) is connected with the first end of the connecting rod (6), a gear (9) is arranged on the moving block (8), a fixed ring (10) in the shape of a ring is arranged on the frame (1), the fixed ring (10) is formed with a rack, the rack is engaged with the gear (9), and the gear (9) is driven by a rotary driving part on the moving block (8). The fixed ring (10) is arranged above the frame (1), two bottom end corners of the fixed ring (10) are supported by support plates (17), the support plates (17) are fixed to the side walls of the frame (1), the fixed ring (10) is symmetrically distributed relative to the central axis of the frame (1), the center of the rail (2) is also located on the center line of the frame (1), and the fixed ring (10) is a semicircular ring. Threaded grooves (11) and placing grooves (12) are formed in the moving block (8), the number of the threaded grooves (11) is two, the threaded grooves (11) are respectively located on the front and rear sides of the moving block (8) and are symmetrically distributed relative to the placing grooves (12), the first end of the connecting rod (6) is placed in the placing groove (12), a limiting plate (13) is fixed to the position close to the first end of the connecting rod (6), and the limiting plate (13) is selectively fixed in one of the two threaded grooves (11) by bolts to adjust the position of the connecting rod (6). A welding repair cabinet (4) is arranged on the frame (1), the welding repair cabinet (4) is used for adjusting welding repair parameters, a handle (5) is installed on the rear side of the frame (1), the handle (5) is used for pushing the device, and the upper part of the connecting rod (6) is higher than the height of the welding repair cabinet (4).

2. A portable rail flaw welding repair apparatus according to claim 1, wherein The rotary driving part is a rotary motor (15).

3. The portable rail flaw welding repair apparatus of claim 1, wherein The first walking assembly comprises a rotating rod (18) fixed in the inner cavity of the frame (1), a roller (19) is rotatably sleeved on the rotating rod (18), and the roller (19) is in rolling contact with the upper surface of the rail (2).

4. A portable rail flaw welding repair apparatus according to claim 3, wherein The first walking assembly comprises a screw rod (20) connected with the frame body (1), the screw rod (20) is fixed with a first sleeve column (21) at the end, the first sleeve column (21) is provided with a first sliding block (22) and a first spring (23) in the inner cavity, the first sliding block (22) is elastically connected with the first sleeve column (21) through the first spring (23), the first sliding block (22) is connected with the first end of a first sliding rod (24), the second end of the first sliding rod (24) is fixed with a clamping block (25), the inner side of the clamping block (25) is rotatably provided with a ball (26), the ball (26) is in rolling contact with the side wall of the steel rail (2), the screw rod (20) is symmetrically arranged in two groups relative to the frame body (1), and the fixed position of the screw rod (20) relative to the frame body (1) is adjustable.

5. The portable rail flaw welding repair apparatus according to claim 1, wherein The second walking assembly comprises a second sleeve column (27), the second sleeve column (27) is provided with a second spring (28) and a second sliding block (29) in the inner cavity, the second sliding block (29) is elastically connected with the second sleeve column (27) through the second spring (28), the second sliding block (29) is connected with the first end of a second sliding rod (30), the second end of the second sliding rod (30) is connected with a fixed plate (31), the fixed plate (31) is connected with the first end of a supporting rod (32), the second end of the supporting rod (32) is rotatably connected with a roller (33), and the fixed plate (31) is symmetrically arranged in two groups relative to the frame body (1).

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