Steel pipe pile butt joint deviation rectifying device

Abstract

The utility model relates to the technical field of steel pipe pile construction, in particular to a steel pipe pile butt joint deviation rectifying device. A supporting plate is included. According to the device, the distance between the two first moving plates can be conveniently adjusted through the arranged first adjusting assemblies, so that the bearing steel pipe pile body can be effectively fixed, the distance between the two second moving plates can be conveniently adjusted through the arranged second adjusting assemblies, and the bearing steel pipe pile body can be effectively fixed. After the bearing steel pipe pile body and the to-be-connected steel pipe pile body are both fixed, the bearing steel pipe pile body and the to-be-connected steel pipe pile body can be located on the same axis; and therefore, a worker can conveniently weld the bearing steel pipe pile body and the to-be-connected steel pipe pile body, and meanwhile, the butt joint precision and the welding effect between the bearing steel pipe pile body and the to-be-connected steel pipe pile body can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel pipe pile construction technical field, concretely relates to a steel pipe pile butt joint deviation rectifying device. BACKGROUND

[0002] In the building construction process, for example bridge infrastructure, often need to put steel pipe pile to the preset depth, due to the limitation of construction and transportation conditions, the length of a steel pipe pile often does not reach the preset depth, therefore, need to butt joint two or more than two steel pipe piles on site to connect together along the axial direction, to meet the construction requirement, at this moment need to use a steel pipe pile butt joint deviation rectifying device.

[0003] At present, when the steel pipe pile is butt jointed, generally adopts the welding mode, but when the butt joint treatment between the receiving steel pipe pile and the steel pipe pile to be connected is carried out, generally needs to use the lifting equipment, and the steel pipe pile to be connected is hoisted through the lifting equipment, and then the hoisted steel pipe pile to be connected is butt jointed with the receiving steel pipe pile, but the steel pipe pile to be connected is easy to shake during hoisting and butt jointing and welding, thereby affecting the welding effect between the receiving steel pipe pile and the steel pipe pile to be connected, and at present, the deviation rectification between the receiving steel pipe pile and the steel pipe pile to be connected is generally judged only by manual, and the accuracy and stability of the steel pipe pile during butt jointing cannot be guaranteed, and the welding effect of the steel pipe pile is also affected.

[0004] Therefore, the technical personnel in the art provides a steel pipe pile butt joint deviation rectifying device to solve the problems in the background art. UTILITY MODEL CONTENTS

[0005] The utility model is purposed to provide a steel pipe pile butt joint deviation rectifying device, which comprises a support plate and further comprises:

[0006] The first moving plate is symmetrically arranged above the support plate, and the upper surfaces of the two first moving plates are fixedly connected with first fixed plates, and the opposite sides of the two first fixed plates are fixedly connected with two first arc-shaped clamping plates.

[0007] The top plate is located above the support plate, and the top plate and the support plate are fixedly connected through a support frame.

[0008] The second moving plate is symmetrically arranged below the top plate, and the bottoms of the two second moving plates are fixedly connected with second fixed plates, and the opposite sides of the two second fixed plates are fixedly connected with two second arc-shaped clamping plates.

[0009] A positioning cylinder is fixedly connected to the upper surface of the support plate, the upper surface of the positioning cylinder is bonded with a rubber pad, the inside of the positioning cylinder is provided with a receiving steel pipe pile body, the upper side of the receiving steel pipe pile body is provided with a to-be-connected steel pipe pile body, and the upper surface of the top plate is provided with a movable groove for the movement of the to-be-connected steel pipe pile body.

[0010] A first adjusting assembly is symmetrically arranged at the bottom of the support plate and used for adjusting the distance between the two first moving plates.

[0011] A second adjusting assembly is symmetrically arranged at the upper surface of the top plate and used for adjusting the distance between the two second moving plates.

[0012] As a further improvement of the technical solution, the first adjusting assembly comprises first adjusting plates symmetrically arranged at the bottom of the support plate, the inner side walls of the two first adjusting plates are both rotationally connected with first bidirectional threaded rods, the other ends of the two first bidirectional threaded rods are both extended to the outside of the first adjusting plates and fixedly connected with first limiting discs, the two first bidirectional threaded rods are transmissionally connected through belt cooperation driving wheels, one side of one of the first adjusting plates is fixedly connected with a first motor, the output shaft of the first motor is fixedly connected with one end of one of the first bidirectional threaded rods through a shaft coupling, the outside of each of the two first bidirectional threaded rods is symmetrically provided with a threaded block, the contact surfaces of the two first adjusting plates and the support plate are both provided with guide grooves for the movement of the threaded blocks, and the upper surfaces of each two threaded blocks are both fixedly connected with the bottoms of two first moving plates.

[0013] As a further improvement of the technical solution, the second adjusting assembly comprises second adjusting plates symmetrically arranged at the upper surface of the top plate, the inner side walls of the two second adjusting plates are both rotationally connected with second bidirectional threaded rods, the other ends of the two second bidirectional threaded rods are both extended to the outside of the second adjusting plates and fixedly connected with second limiting discs, the two second bidirectional threaded rods are transmissionally connected through belt cooperation driving wheels, one side of one of the second adjusting plates is fixedly connected with a second motor, the output shaft of the second motor is fixedly connected with one end of one of the second bidirectional threaded rods through a shaft coupling, the outside of each of the two second bidirectional threaded rods is symmetrically provided with a threaded plate, the contact surfaces of the two second adjusting plates and the top plate are both provided with guide grooves for the movement of the threaded plates, and the bottoms of each two threaded plates are both fixedly connected with the upper surfaces of two second moving plates.

[0014] As a further improvement of the technical solution, the bottoms of the two first moving plates are both symmetrically provided with support rods, the bottoms of the support rods are all fixedly connected with movable wheels, and the upper surface of the support plate is provided with guide grooves for the movement of the movable wheels.

[0015] As a further improvement of the technical solution, the bottom of the top plate is fixedly connected with a plurality of connecting plates, a guide rod is fixedly connected between every two connecting plates, and a guide block is symmetrically arranged at the bottom of each of the two second moving plates.

[0016] As a further improvement of the technical solution, the bottom of the support plate is symmetrically provided with trapezoidal support feet, an antiskid pad is bonded to the bottom of each of the two trapezoidal support feet, and a herringbone antiskid groove is equidistantly formed in the bottom of each of the two antiskid pads.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] In the butt joint deviation correcting device for steel pipe piles, when butt joint processing between the receiving steel pipe pile body and the to-be-connected steel pipe pile body is needed, the receiving steel pipe pile body is first placed in the positioning cylinder, the first adjusting assembly starts to operate, the first adjusting assembly effectively drives the two first moving plates to move synchronously, the first moving plates drive the first fixed plate and the first arc-shaped clamping plate to move synchronously, the first arc-shaped clamping plate clamps the receiving steel pipe pile body after clamping is completed, the receiving steel pipe pile body is fixed, the to-be-connected steel pipe pile body is hoisted by the hoisting equipment, the to-be-connected steel pipe pile body is passed through the movable slot in the top surface of the top plate, the bottom of the to-be-connected steel pipe pile body is butt jointed with the top surface of the receiving steel pipe pile body, the second adjusting assembly starts to operate after the to-be-connected steel pipe pile body is in contact with the receiving steel pipe pile body, the second adjusting assembly effectively drives the two second moving plates to move synchronously, the second moving plates drive the second fixed plate and the second arc-shaped clamping plate to move synchronously, the second arc-shaped clamping plate clamps the to-be-connected steel pipe pile body after clamping is completed, the to-be-connected steel pipe pile body is fixed, the to-be-connected steel pipe pile body and the receiving steel pipe pile body are conveniently and effectively butt jointed, the to-be-connected steel pipe pile body and the receiving steel pipe pile body are welded by the worker, the to-be-connected steel pipe pile body and the receiving steel pipe pile body are in the vertical and centered state, the precision of butt joint between the to-be-connected steel pipe pile body and the receiving steel pipe pile body is improved, and the welding effect after butt joint between the to-be-connected steel pipe pile body and the receiving steel pipe pile body is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an overall three-dimensional structure schematic view of the utility model;

[0020] Figure 2It is the cutaway three-dimensional structure schematic view of the first adjusting plate and the second adjusting plate in the utility model;

[0021] Figure 3 It is the three-dimensional structure schematic view of the receiving steel pipe pile body and the to-be-connected steel pipe pile body after being disassembled in the utility model;

[0022] Figure 4 It is the bottom view three-dimensional structure schematic view of the utility model.

[0023] The meaning of each reference numeral in the figure is as follows:

[0024] 1, support plate; 2, first moving plate; 3, first fixed plate; 4, first arc-shaped clamping plate; 5, positioning cylinder; 6, receiving steel pipe pile body; 7, to-be-connected steel pipe pile body; 8, support frame; 9, top plate; 10, first adjusting plate; 11, second adjusting plate; 12, first motor; 13, first bidirectional threaded rod; 14, threaded block; 15, first limiting disc; 16, belt; 17, second motor; 18, second bidirectional threaded rod; 19, threaded plate; 20, second limiting disc; 21, second moving plate; 22, second fixed plate; 23, second arc-shaped clamping plate; 24, connecting plate; 25, guide rod; 26, guide block; 27, support rod; 28, movable wheel; 29, trapezoidal support foot. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] Please refer to Figure 1 - Figure 4 As shown in the figure, the embodiment provides a steel pipe pile butt joint deviation rectifying device, which comprises a support plate 1 and further comprises:

[0027] The first moving plate 2 is symmetrically arranged above the support plate 1, the upper surfaces of the two first moving plates 2 are both fixedly connected with the first fixed plate 3, and the opposite sides of the two first fixed plates 3 are both fixedly connected with the two first arc-shaped clamping plates 4.

[0028] The top plate 9 is located above the support plate 1, and the top plate 9 and the support plate 1 are fixedly connected through the support frame 8;

[0029] The second moving plate 21 is symmetrically arranged below the top plate 9, the bottoms of the two second moving plates 21 are both fixedly connected with the second fixed plate 22, and the opposite sides of the two second fixed plates 22 are both fixedly connected with the two second arc-shaped clamping plates 23.

[0030] The positioning cylinder 5 is fixedly connected to the upper surface of the support plate 1, the upper surface of the positioning cylinder 5 is bonded with a rubber pad, the inside of the positioning cylinder 5 is provided with the receiving steel pipe pile body 6, the upper side of the receiving steel pipe pile body 6 is provided with the to-be-connected steel pipe pile body 7, and the upper surface of the top plate 9 is provided with a movable slot for the movement of the to-be-connected steel pipe pile body 7;

[0031] The first adjusting assembly is symmetrically arranged at the bottom of the support plate 1 and is used for adjusting the distance between the two first moving plates 2.

[0032] The second adjusting assembly is symmetrically arranged on the upper surface of the top plate 9 and is used for adjusting the distance between the two second moving plates 21.

[0033] The above working principle is as follows: when the receiving steel pipe pile body 6 and the to-be-connected steel pipe pile body 7 need to be connected, the receiving steel pipe pile body 6 is first placed in the inside of the positioning cylinder 5, at this time, the first adjusting assembly starts to work, the first adjusting assembly can effectively drive the two first moving plates 2 to move synchronously to the middle, the first moving plates 2 drive the first fixed plate 3 and the first arc-shaped clamping plate 4 to move synchronously, when the first arc-shaped clamping plate 4 clamps the receiving steel pipe pile body 6, the receiving steel pipe pile body 6 can be effectively fixed, when the receiving steel pipe pile body 6 is fixed, the to-be-connected steel pipe pile body 7 is hoisted by the hoisting equipment, at this time, the to-be-connected steel pipe pile body 7 is only needed to be inserted into the movable slot on the upper surface of the top plate 9, and the bottom of the to-be-connected steel pipe pile body 7 is connected with the upper surface of the receiving steel pipe pile body 6, when the to-be-connected steel pipe pile body 7 is connected with the receiving steel pipe pile body 6, the second adjusting assembly starts to work, at this time, the second adjusting assembly can effectively drive the two second moving plates 21 to move synchronously to the middle, the second moving plates 21 drive the second fixed plate 22 and the second arc-shaped clamping plate 23 to move synchronously, when the second arc-shaped clamping plate 23 clamps the to-be-connected steel pipe pile body 7, the to-be-connected steel pipe pile body 7 can be effectively fixed, at this time, the to-be-connected steel pipe pile body 7 and the receiving steel pipe pile body 6 can be conveniently and effectively connected, so as to facilitate the welding of the to-be-connected steel pipe pile body 7 and the receiving steel pipe pile body 6, and ensure that the to-be-connected steel pipe pile body 7 and the receiving steel pipe pile body 6 are in a vertical and centered state, which can effectively improve the accuracy of the connection between the to-be-connected steel pipe pile body 7 and the receiving steel pipe pile body 6, and improve the welding effect after the connection between the to-be-connected steel pipe pile body 7 and the receiving steel pipe pile body 6, thereby saving time and effort.

[0034] In order to effectively fix the receiving steel pipe pile body 6, the first adjusting assembly comprises two first adjusting plates 10 symmetrically arranged at the bottom of the support plate 1, the inner side wall of each first adjusting plate 10 is rotationally connected with a first bidirectional threaded rod 13, one end of each first bidirectional threaded rod 13 extends to the outside of the first adjusting plate 10 and is fixedly connected with a first limiting disc 15, the two first bidirectional threaded rods 13 are drivingly connected through a belt 16 cooperating with driving wheels, one side of one of the first adjusting plates 10 is fixedly connected with a first motor 12, the output shaft of the first motor 12 is fixedly connected with one end of one of the first bidirectional threaded rods 13 through a shaft coupling, the outside of each first bidirectional threaded rod 13 is symmetrically provided with a threaded block 14, the contact surface of each first adjusting plate 10 and the support plate 1 is provided with a guide groove for the movement of the threaded block 14, the upper surface of each two threaded blocks 14 is fixedly connected with the bottom of each two first moving plates 2, when it is needed to fix the receiving steel pipe pile body 6, the receiving steel pipe pile body 6 is first placed in the inside of the positioning cylinder 5, at this time the first motor 12 starts to operate to drive one of the first bidirectional threaded rods 13 to rotate synchronously, since the two first bidirectional threaded rods 13 are drivingly connected through the belt 16 cooperating with the driving wheels, at this time the two first bidirectional threaded rods 13 will rotate synchronously, the threaded blocks 14 will move synchronously on the outside of the first bidirectional threaded rods 13, the first moving plates 2 will move synchronously, the first moving plates 2 will drive the first fixed plates 3 and the first arc-shaped clamping plates 4 to move synchronously, when the first arc-shaped clamping plates 4 clamp the receiving steel pipe pile body 6, the receiving steel pipe pile body 6 can be effectively fixed, so as to facilitate the subsequent butt joint of the to-be-connected steel pipe pile body 7 and the receiving steel pipe pile body 6, the two driving wheels are not the same in size, so they will not affect the transmission relationship between the two first bidirectional threaded rods 13.

[0035] Considering that the to-be-connected steel pipe pile body 7 also needs to be fixed when the butt joint process between the to-be-connected steel pipe pile body 7 and the connected steel pipe pile body 6 is carried out, the second adjusting assembly comprises second adjusting plates 11 symmetrically arranged on the upper surface of the top plate 9, the inner side walls of the two second adjusting plates 11 are both rotationally connected with second bidirectional threaded rods 18, the other ends of the two second bidirectional threaded rods 18 are both extended to the outside of the second adjusting plates 11 and fixedly connected with second limiting discs 20, the two second bidirectional threaded rods 18 are drivingly connected through the transmission of the belt 16 and the driving wheels, one side of one of the second adjusting plates 11 is fixedly connected with a second motor 17, the output shaft of the second motor 17 is fixedly connected with one end of one of the second bidirectional threaded rods 18 through a shaft coupling, the outside of each of the two second bidirectional threaded rods 18 is symmetrically provided with a threaded plate 19, the contact surfaces of the two second adjusting plates 11 and the top plate 9 are both provided with guide grooves for the movement of the threaded plates 19, the bottoms of every two threaded plates 19 are respectively fixedly connected with the upper surfaces of two second moving plates 21, after the fixing of the connected steel pipe pile body 6 is completed, the to-be-connected steel pipe pile body 7 is inserted into the movable groove arranged on the upper surface of the top plate 9, and then the bottom of the to-be-connected steel pipe pile body 7 is butted with the upper surface of the connected steel pipe pile body 6, when the bottom of the to-be-connected steel pipe pile body 7 contacts with the upper surface of the connected steel pipe pile body 6, the second motor 17 starts to operate, at this time, the second motor 17 drives one of the second bidirectional threaded rods 18 to rotate synchronously, since the two second bidirectional threaded rods 18 are drivingly connected through the transmission of the belt 16 and the driving wheels, at this time, the two second bidirectional threaded rods 18 rotate synchronously, the threaded plates 19 move synchronously on the outside of the second bidirectional threaded rods 18, the second moving plates 21 move synchronously, and the second fixed plates 22 and the second arc-shaped clamping plates 23 move synchronously, after the second arc-shaped clamping plates 23 clamp the to-be-connected steel pipe pile body 7, the to-be-connected steel pipe pile body 7 can be effectively fixed, at this time, the to-be-connected steel pipe pile body 7 is also in the vertical state, so that the connected steel pipe pile body 6 and the to-be-connected steel pipe pile body 7 are on the same axis, thereby ensuring the accuracy of the butt joint between the to-be-connected steel pipe pile body 7 and the connected steel pipe pile body 6, and effectively improving the welding effect after the butt joint between the to-be-connected steel pipe pile body 7 and the connected steel pipe pile body 6, the two driving wheels are different in size, so they will not affect the transmission relationship between the two second bidirectional threaded rods 18.

[0036] In order to effectively improve the stability of the first moving plate 2 when moving, the bottom of the two first moving plates 2 is symmetrically provided with a supporting rod 27, the bottom end of the plurality of supporting rods 27 is fixedly connected with a movable wheel 28, the upper surface of the supporting plate 1 is provided with a guide groove for the movable wheel 28 to move, and the supporting rod 27 is moved synchronously in the moving process of the first moving plate 2, and the movable wheel 28 is moved synchronously by the supporting rod 27, so that the smoothness of the first moving plate 2 when moving can be improved by the movable wheel 28, the supporting rod 27 can support the first moving plate 2 to a certain extent, thereby effectively improving the stability of the first moving plate 2 when moving.

[0037] In order to effectively improve the stability of the second moving plate 21 when moving, the bottom of the top plate 9 is fixedly connected with a plurality of connecting plates 24, the connecting plates 24 are fixedly connected with a guide rod 25, the bottom of the two second moving plates 21 is symmetrically provided with a guide block 26, the inside of the plurality of guide blocks 26 is provided with a guide groove for the guide rod 25 to move, and the guide block 26 is moved synchronously outside the guide rod 25 in the moving process of the second moving plate 21, so that the guide block 26 and the guide rod 25 can effectively play a limiting and guiding role, thereby effectively improving the stability of the second moving plate 21 when moving.

[0038] In addition, in order to prevent displacement and other situations from occurring during the operation of the device, causing danger, the bottom of the supporting plate 1 is symmetrically provided with a trapezoidal supporting leg 29, the bottom of the two trapezoidal supporting legs 29 is bonded with a non-slip pad, the bottom of the two non-slip pads is provided with a herringbone anti-skid groove at equal intervals, and the non-slip pad and the herringbone anti-skid groove can effectively play an anti-skid role, thereby effectively preventing displacement and other situations from occurring during the operation of the device, causing danger.

[0039] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and do not limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A butt joint deviation rectifying device for steel pipe piles, comprising a support plate (1), characterized in that, Also include: The first moving plate (2) is symmetrically arranged above the support plate (1), the upper surface of the two first moving plates (2) is fixedly connected with the first fixed plate (3), and the opposite side of the two first fixed plates (3) is fixedly connected with two first arc-shaped clamping plates (4); The top plate (9) is located above the support plate (1), and the top plate (9) and the support plate (1) are fixedly connected through the support frame (8); The second moving plate (21) is symmetrically arranged below the top plate (9), the bottom of the two second moving plates (21) is fixedly connected with the second fixed plate (22), and the opposite side of the two second fixed plates (22) is fixedly connected with two second arc-shaped clamping plates (23); The positioning cylinder (5) is fixedly connected to the upper surface of the support plate (1), the upper surface of the positioning cylinder (5) is bonded with a rubber pad, the inside of the positioning cylinder (5) is provided with a receiving steel pipe pile body (6), the upper side of the receiving steel pipe pile body (6) is provided with a to-be-connected steel pipe pile body (7), and the upper surface of the top plate (9) is provided with a movable slot for the to-be-connected steel pipe pile body (7) to move; The first adjusting assembly is symmetrically arranged at the bottom of the support plate (1) and is used for adjusting the distance between the two first moving plates (2); The second adjusting assembly is symmetrically arranged on the upper surface of the top plate (9) and is used for adjusting the distance between the two second moving plates (21).

2. The butt joint deviation rectifying device for steel pipe pile according to claim 1, characterized in that: The first adjusting assembly includes first adjusting plates (10) symmetrically arranged at the bottom of the support plate (1), first bidirectional threaded rods (13) rotatably connected to the inner side walls of the two first adjusting plates (10), first limiting discs (15) fixedly connected to the other ends of the two first bidirectional threaded rods (13) and extending to the outside of the first adjusting plates (10), two driving wheels drivingly connected through a belt (16) between the two first bidirectional threaded rods (13), a first motor (12) fixedly connected to one side of one of the first adjusting plates (10), a output shaft of the first motor (12) fixedly connected to one end of one of the first bidirectional threaded rods (13) through a shaft coupling, screw blocks (14) symmetrically arranged on the outside of the two first bidirectional threaded rods (13), guide grooves for the screw blocks (14) to move formed in the contact surfaces of the two first adjusting plates (10) and the support plate (1), and the upper surfaces of every two screw blocks (14) are fixedly connected with the bottoms of two first moving plates (2) respectively.

3. The butt joint deviation rectifying device for steel pipe pile according to claim 1, characterized in that: The second adjusting assembly comprises second adjusting plates (11) symmetrically arranged on the upper surface of the top plate (9), the inner side walls of the two second adjusting plates (11) are rotationally connected with second bidirectional threaded rods (18), the other ends of the two second bidirectional threaded rods (18) extend to the outside of the second adjusting plates (11) and are fixedly connected with second limiting discs (20), the two second bidirectional threaded rods (18) are drivingly connected through a belt (16) and a driving wheel, one side of one of the second adjusting plates (11) is fixedly connected with a second motor (17), the output shaft of the second motor (17) is fixedly connected with one end of one of the second bidirectional threaded rods (18) through a shaft coupling, the outside of the two second bidirectional threaded rods (18) is symmetrically provided with threaded plates (19), the contact surfaces of the two second adjusting plates (11) and the top plate (9) are both provided with guide grooves for the movement of the threaded plates (19), and the bottoms of every two threaded plates (19) are fixedly connected with the upper surfaces of two second moving plates (21) respectively.

4. The butt joint deviation rectifying device for steel pipe pile according to claim 1, characterized in that: The bottoms of the two first moving plates (2) are symmetrically provided with supporting rods (27), the bottoms of the supporting rods (27) are fixedly connected with movable wheels (28), and the upper surface of the supporting plate (1) is provided with guide grooves for the movement of the movable wheels (28).

5. The butt joint deviation rectifying device for steel pipe pile according to claim 1, characterized in that: The bottom of the top plate (9) is fixedly connected with a plurality of connecting plates (24), the connecting plates (24) are fixedly connected with guide rods (25), the bottoms of the two second moving plates (21) are symmetrically provided with guide blocks (26), and the interiors of the guide blocks (26) are provided with guide grooves for the movement of the guide rods (25).

6. The butt joint deviation rectifying device of a steel pipe pile according to claim 1, characterized in that: The bottom of the supporting plate (1) is symmetrically provided with trapezoidal supporting legs (29), the bottoms of the two trapezoidal supporting legs (29) are bonded with anti-skid pads, and the bottoms of the two anti-skid pads are provided with anti-skid grooves in a herringbone shape at equal intervals.

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