CN219404718U - Tubular pile head moving and cutting device - Google Patents

Abstract

The application discloses a tubular pile head removes cutting device relates to pile head cutting device field, and it includes the shallow and installs the cutting assembly on the shallow, the multiunit universal wheel that is used for supplying the shallow to remove and the lifting assembly who is used for driving the shallow to go up and down are installed to the shallow lower part, the shallow rear end is installed the hand push portion; the cutting assembly is arranged at the front end of the cart and comprises at least two groups of cutters, and the two groups of cutters are symmetrically distributed relative to the center line of the cart. According to the pile head cutting device, the lifting of the pile head moving cutting device and the synchronous cutting of the pile head can be realized, and the pile head cutting quality and the pile head cutting efficiency are improved while the adaptive range of the pile head cutting device to the height of the pile head is improved.

Description

Tubular pile head moving and cutting device

Technical Field

The application relates to the field of pile head cutting devices, in particular to a tubular pile head moving and cutting device.

Background

Precast piles are made of various materials and in various forms in factories or construction sites, mainly comprise concrete precast piles and steel piles, and because the concrete precast piles can bear larger load, are firm and durable and have high construction speed, the concrete precast piles are more widely applied than the steel piles, and are commonly applied to the construction fields of municipal administration, water conservancy and the like, and pile sinking equipment is generally adopted to drive, press or shake the concrete precast piles into the soil. After pile foundation construction is completed, uneven pile heads are always left on the ground of a construction site, or the length of the pile heads exposed out of the ground exceeds a set length, so that pile heads are cut by a pile head cutting machine to flatten the tail end parts of precast piles.

At present, a relatively common small pile head cutting machine in the prior art mainly comprises the following two types: the first is a pile hoop encircling type cutting machine, which consists of two parts, namely a pile hoop and a cutting machine, wherein the pile hoop is sleeved on a pile head when the pile hoop is used, the cutting machine is arranged on the pile hoop, a hanging plate is arranged on the outer side of the pile hoop, a shaft hole is formed in the hanging plate, a hook is arranged on the bottom surface of a mounting plate of the cutting machine, the position of the hook on the mounting plate can be adjusted, the hook is hung in the shaft hole of the hanging plate, the hook can rotate along the shaft hole, the hook is hung on the hanging plate to mount the pile hoop and the cutting machine together, the position of the hook on the mounting plate can be adjusted, and when the connection between the cutting machine and the pile hoop is worn or the feeding direction of a blade is deviated, the level of a cutting surface is ensured by adjusting the position of the hook; the second is hand propelled movable cutting machine, it comprises the shallow and install the cutting assembly two parts on the shallow, the cutting assembly includes the cutter of disc and is used for driving and controlling cutter pivoted drive control module, the height of cutter distance ground is the shallow bottom distance ground generally, the height of cutter distance ground is the constant value generally promptly, at the in-process of cutting the pile head, operating personnel can directly promote the shallow and be close to the pile head and make the cutter contact the pile head, adopt drive control module to drive the cutter rotate and control the cutter through advancing the shallow and cut into the degree of depth of pile head, thereby realize the cutting of pile head.

In the actual construction process, when the pile head with a certain height from the ground is required to be cut, the two pile head cutting machines have some problems, wherein: the first pile head cutting machine has heavy dead weight, is inconvenient to carry, and actually has a falling risk when the pile hoop and the cutting machine are lifted to a higher height; the second pile head cutting machine is only suitable for low-level cutting due to the limitation of the height of the trolley and the cutter from the ground, and is difficult to adapt to pile head cutting with a certain height. Meanwhile, the two pile head cutting machines are generally used for cutting by a single saw blade, and the problems that the pile head is unevenly stressed left and right in the cutting process and the pile head cutting quality and the pile head cutting efficiency are to be improved exist.

Disclosure of Invention

In order to be able to carry out the adaptability cutting to the pile head that has certain height to ground, make the pile head about the cutting process atress even, improve pile head cutting quality and pile head cutting efficiency, this application provides a tubular pile head removal cutting device.

The application provides a tubular pile head removes cutting device adopts following technical scheme:

the pipe pile head moving and cutting device comprises a trolley and a cutting assembly arranged on the trolley, wherein a plurality of groups of universal wheels for moving the trolley and a lifting assembly for driving the trolley to lift are arranged at the lower part of the trolley, and a hand pushing part is arranged at the rear end of the trolley; the cutting assembly is arranged at the front end of the cart and comprises at least two groups of cutters, and the two groups of cutters are symmetrically distributed relative to the center line of the cart.

Through adopting above-mentioned technical scheme, the hand push portion of universal wheel and shallow rear end below the shallow makes the shallow can remove subaerial to supply operating personnel to drive cutting assembly and be close to waiting to cut the pile head. After an operator drives the cutting assembly to approach the pile head to be cut, the operator can drive the trolley to lift by adopting the lifting assembly, and the cutter is lifted/lowered to the pile line position of the pile head to be cut so as to adaptively cut the pile head at a certain height from the ground; and two groups of cutters are respectively positioned at two sides of the pile head of the tubular pile, and the pile head is synchronously cut from the two sides of the pile head, so that the left and right stress of the pile head is uniform, the cutting surface of the pile head is smoother, and the uniform cutting of the pile head is efficiently realized.

Optionally, the lifting assembly includes that the lifting locates the fixing base of shallow below, rotation connect in the drive lead screw of shallow lower part and be used for driving the drive lead screw and carry out pivoted drive part, the fixing base is parallel with the shallow diapire, drive lead screw upper end activity runs through the shallow diapire and with the shallow diapire looks perpendicular, the lower extreme rotates to be connected on the fixing base.

By adopting the technical scheme, the driving part is adopted to drive the driving screw rod to rotate, so that the fixing seat can be driven to ascend/descend more conveniently; when the fixed seat descends below the universal wheels, the fixed seat can replace the universal wheels to support the cart, and along with the fact that the two groups of cutters are cut into the pile head respectively, the driving screw rod drives the fixed seat to descend continuously, the driving screw rod and the fixed seat can drive the cart to ascend continuously, and therefore the cart ascends to the position of the pre-cutting line of the pile head stably; and the driving screw rod has a self-locking function, and when the trolley rises to the height of the pile head pre-cutting line, the trolley and the cutting assembly are not easy to fall down, so that the cutter is favorable for stably cutting the pile head.

Optionally, the drive part includes rotating the drive bevel gear who connects on the shallow, coaxial cover establishes and the screw thread assembly is on the driven bevel gear on the drive lead screw and is used for driving the rotatory hand pole of drive bevel gear, driven bevel gear rotates around its axis and connects on the shallow diapire, drive bevel gear meshes with driven bevel gear, the coaxial fixed connection of hand pole one end is in the middle part of drive bevel gear, the other end extends to the shallow rear.

Through adopting above-mentioned technical scheme, rotate hand pole, can order about driving bevel gear comparatively conveniently to drive driven bevel gear and rotate to comparatively conveniently and stably realize the lift of shallow, so that the cutter cuts the pile head.

Optionally, two groups of horizontal supporting arms symmetrical relative to the center line of the cart are installed at the front end of the cart, and a symmetrical encircling space is formed between the two groups of supporting arms; the cutters are arranged in two groups, and the two groups of cutters are horizontally and rotatably connected to the two groups of support arms along the direction of approaching/separating from the central line of the encircling space.

By adopting the technical scheme, the pile head is arranged in the encircling space between the two groups of supporting arms, and the two groups of cutters are close to/far away from each other, so that the left and right synchronous cutting of the pile head can be realized more conveniently.

Optionally, the two sets of support arms are all connected in the shallow front end around vertical axis rotation, and are provided with the locking subassembly that is used for carrying out the locking to the rotation of two sets of support arms between the one end that the shallow was kept away from to the two sets of support arms.

Through adopting above-mentioned technical scheme, rotate the support arm and adopt locking subassembly at the shallow front end to lock the rotation of two sets of support arms, can realize the adjustment to the size of encircling the space between two sets of support arms to make pile head remove cutting device can adapt to the pile head cutting of different diameters, improve pile head and remove cutting device's adaptability.

Optionally, the locking assembly comprises a locking screw rod with one end hinged to one group of supporting arms, a nut assembled on the locking screw rod in a threaded manner, and a locking hasp mounted on the rest group of supporting arms, wherein the movable end of the locking screw rod is movably close to/far away from the locking hasp and is buckled with the locking hasp in a matched manner.

Through adopting above-mentioned technical scheme, make the loose end of locking screw rod be close to the locking hasp and lock joint in the clearance between the support arm at locking hasp and locking hasp place, screw the nut again, can be comparatively conveniently fixed in the pile head with two sets of support arms, make two sets of support arms press from both sides tight pile head, the cutter on the support arm of being convenient for is close to the pile head steadily, realizes the cutting to the pile head.

Optionally, the two groups of support arms are both connected to the front end of the cart in a rotating manner around the vertical axis, and the front end of the cart is provided with a driving assembly for driving the two groups of support arms to approach/depart from each other.

Through adopting above-mentioned technical scheme, adopt drive assembly to order about the support arm and be close to each other/keep away from, can realize the adjustment to the size of encircling the space between two sets of support arms, and to a certain extent, the open-ended area interval in encircling the space that can form between two sets of support arms is enlarged.

Optionally, the driving assembly comprises a driving cylinder fixedly installed at the front end of the cart, a double-sided toothed plate fixedly installed on an output shaft of the driving cylinder, and two groups of driving gears horizontally arranged and rotatably installed at the front end of the cart; the two groups of driving gears are symmetrically distributed relative to the center line of the trolley, the two groups of supporting arms are respectively connected to the front end of the trolley through the two groups of driving gears in a rotating mode, and the two sides of the double-side toothed plate in the length direction are respectively meshed with the two groups of driving gears.

Through adopting above-mentioned technical scheme, utilize the actuating cylinder to drive two side pinion rack forward/backward propulsion, can be comparatively convenient and order about the drive gear drive support arm mutually keep away from/be close to steadily to comparatively convenient and stably realize encircling the regulation of space size between two sets of support arms.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through cooperation of the trolley, the cutting assembly, the universal wheels and the cutting assembly, lifting of the pile head moving and cutting device and synchronous cutting of the pile head left and right can be realized, so that cutting of a pile head at a certain height can be realized more efficiently, a flatter pile head cutting surface can be obtained, and the pile head cutting quality and the pile head cutting efficiency can be improved while the adaptive range of the pile head cutting device to the pile head height is improved;

2. through the cooperation of the fixed seat, the driving screw rod, the driving bevel gear, the driven bevel gear and the hand lever, the lifting adjustment of the trolley and the cutting assembly can be conveniently and stably realized by rotating the hand lever, so that the pile head moving and cutting device can adaptively realize stable cutting of the pile head;

3. through making the support arm rotate and install on the shallow to make the cutter rotate and install on the support arm, can improve pile head and remove cutting device and cut the adaptability of pile head cutting of different diameters, the cutter on the support arm of being convenient for is close to the pile head and carries out stable cutting to the pile head.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present application;

FIG. 2 is a schematic view showing a partial structure of embodiment 1 of the present application;

FIG. 3 is a schematic overall structure of embodiment 2 of the present application;

fig. 4 is a schematic partial structure of embodiment 1 of the present application.

Reference numerals: 1. a cart; 11. a universal wheel; 12. a support arm; 2. a cutting assembly; 21. a cutter; 3. a lifting assembly; 31. a fixing seat; 32. driving a screw rod; 33. a drive bevel gear; 34. a driven bevel gear; 35. a hand rocker; 4. a locking assembly; 41. a locking screw; 42. a screw cap; 43. a locking buckle; 5. a drive assembly; 51. a drive cylinder; 52. double-sided toothed plates; 53. and a drive gear.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

The embodiment of the application discloses a tubular pile head removes cutting device.

Example 1:

referring to fig. 1, a pipe pile head moving and cutting device comprises a cart 1, a cutting assembly 2 mounted on the cart 1 for synchronously cutting pile heads on any left and right sides of the pile heads, and a lifting assembly 3 for driving the cart 1 to lift.

Specifically, the surface of the bottom of the cart 1 is horizontally arranged, a plurality of groups of universal wheels 11 are arranged on the periphery of the bottom of the cart 1, and a hand pushing part which is convenient for a human hand to push the cart 1 is arranged at the rear end of the cart 1; the hand pushing part is held, and the universal wheel 11 is utilized to drive the cart 1 to be close to the pile head, so that the cutting assembly 2 can be conveniently driven to be close to the pile head to be cut.

Referring to fig. 1 and 2, the lifting assembly 3 is installed at a middle position of the bottom of the cart 1, and the lifting assembly 3 specifically includes a fixing seat 31 lifting and locating below the cart 1, a driving screw 32 rotatably connected to the lower portion of the cart 1, and a driving member for driving the driving screw 32 to rotate.

The fixed seat 31 can be rectangular plate-shaped or rectangular frame-shaped, the fixed seat 31 is parallel to the bottom wall of the cart 1, and the fixed seat 31 vertically rises and falls relative to the bottom wall of the cart 1; the side of the fixed seat 31 far away from the cart 1 is respectively provided with supporting legs protruding downwards at four corners of the fixed seat 31, and one side of the supporting legs far away from the fixed seat 31 can be in a rough surface or tip. When the bottom surfaces of the supporting legs are arranged in a rough surface mode, the friction force between the supporting legs and the ground is relatively large, and the pile head cutting device is beneficial to adapting to pile head cutting at a flat ground; when the bottom surfaces of the supporting legs are arranged in a tip mode, the pressure intensity at the contact position between the supporting legs and the ground is high, and the pile head cutting device is favorable for cutting pile heads on soft ground/relatively uneven ground.

Referring to fig. 1 and 2, a driving screw rod 32 is perpendicular to the bottom wall of the cart 1 and the fixed seat 31, the upper end of the driving screw rod 32 penetrates through the bottom wall of the cart 1 and is horizontally and rotatably connected to the bottom wall of the cart 1 through a driving assembly 5, and the lower end of the driving screw rod 32 is rotatably connected to the middle part of the fixed seat 31; and the driving part specifically includes a drive bevel gear 33 rotatably connected to the cart 1, a driven bevel gear 34 coaxially sleeved and screw-fitted on the driving screw 32, and a hand crank 35 for driving the drive bevel gear 33 to rotate.

In order to facilitate manual operation and control lifting of the cart 1, the drive bevel gear 33 and the hand rocker 35 are both positioned at the rear end of the cart 1, the axis of the drive bevel gear 33 is horizontally arranged, and the drive bevel gear 33 is rotatably connected to the cart 1 around the axis thereof; the hand rocker 35 is Z-shaped, two parallel rod parts of the hand rocker 35 are parallel to the front-back length direction of the cart 1, and the middle part of the drive bevel gear 33 is coaxial with any one of the parallel rod parts of the hand rocker 35 and is fixedly connected with the same, so that a person can hold the hand rocker 35 and apply force to the hand rocker 35.

Further, referring to fig. 1 and 2, in embodiment 1 of the present application, the cutters 21 are arranged in two groups, in other embodiments of the present application, the cutters 21 may be arranged in any integer multiple of the two groups, two groups of horizontal and arc-shaped support arms 12 symmetrical with respect to the centerline of the cart 1 are rotatably mounted at the front end of the cart 1, the support arms 12 arc inwards, the rotation axes of the support arms 12 are vertically arranged, and symmetrical encircling spaces (the encircling spaces may be in different shapes such as circles, shuttles or outwardly expanded fans) are formed between the two groups of support arms 12.

The blades of the two groups of cutters 21 are respectively connected to the two groups of support arms 12 in a horizontal rotation way along the direction of approaching/separating from the central line of the encircling space, and a locking component 4 for locking the rotation of the two groups of support arms 12 is arranged between one ends of the two groups of support arms 12, which are far away from the cart 1; the two sets of cutters 21 are symmetrical relative to the centre line of the trolley 1, and the cutter 21 blades are positioned below the support arm 12, the height of the cutter 21 blades from the bottom of the universal wheel 11 is within 30cm, so that the cutters 21 adapt to the low-level cutting of the pile head.

Accordingly, the locking assembly 4 includes a locking screw 41, a nut 42 threadedly mounted on the locking screw 41, and a locking buckle 43.

Referring to fig. 1 and 2, in the two sets of support arms 12, a locking groove with a groove width matched with the diameter of the locking screw 41 is formed in the middle of the support arm 12 positioned at the left side of the cart 1, and a locking hasp 43 is installed at the locking groove and used for controlling the opening and closing of the opening of the locking groove; one end of the locking screw 41 is hinged to the supporting arm 12 on the right side of the cart 1 (the right side of the traveling direction of the cart 1 is taken as the right side of the cart 1), and the other end of the locking screw 41 is suitable for being inserted into the locking groove in a clamping manner and is buckled with the locking groove and the locking buckle 43 in a matching manner (in the embodiment of the application, the hinged end of the locking screw 41 and the right side of the cart 1 is taken as one end of the locking screw 41, and the movable end of the other end of the locking screw 41 is taken as the other end of the locking screw 41).

After the trolley 1 and the cutting assembly 2 are lifted up/down to a designated working height by utilizing the lifting assembly 3, the diameter of the pile head to be cut is determined, and an operator can correspondingly enlarge/reduce the encircling space between the two supporting arms 12, so that the axis of the pile head to be cut is approximately positioned at the central position of the encircling space, and the pre-positioning of the pile head to be cut is realized; the movable end of the locking screw 41 is close to the locking groove and is blocked and inserted into the locking groove, the locking screw 41 is buckled in the locking groove by utilizing the locking hasp 43, and the screw cap 42 is screwed, so that the two groups of supporting arms 12 can be conveniently fixed on the pile head, the two groups of supporting arms 12 clamp the pile head, and the accurate positioning of the pile head to be cut is realized.

Then, the operator can rotate the two sets of cutters 21 in opposite directions on the supporting arm 12 towards the central position of the encircling space, and make the close/distant amplitudes of the blades of the two sets of cutters 21 towards the central position of the encircling space keep consistent, so that the pile head can be conveniently and stably cut in a relatively efficient bidirectional manner.

The implementation principle of the pipe pile head moving and cutting device in embodiment 1 of the application is as follows: the driving screw rod 32 is driven by the hand rocker 35 to drive the fixed seat 31 to lift, and the cart 1 and the cutting assembly 2 can be driven to lift along the vertical direction, so that the cutter 21 of the pile head moving and cutting device can be effectively aligned with the cutting line of the pile head at a certain height; simultaneously, the support arms 12, the locking screw 41, the screw cap 42 and the locking snap 43 are matched, and the two groups of cutters 21 are rotated around the vertical axis, so that the adjustment of the encircling space between the two groups of support arms 12 can be realized, the two groups of support arms 12 clamp the pile head, and the two groups of cutters 21 can synchronously approach/depart from the pile head to be cut, thereby realizing the left-right synchronous cutting of the pile head and obtaining a relatively flat pile head cutting surface; and the pile head cutting device can effectively improve the cutting quality and the cutting efficiency of the pile head while improving the adaptive range of the pile head cutting device to the height of the pile head.

Example 2:

referring to fig. 1 and 3, embodiment 2 of the present application is different from embodiment 1 in that: the front end of the cart 1 is provided with a drive assembly 5 for driving the two sets of support arms 12 towards/away from each other.

Referring to fig. 3 and 4, the driving assembly 5 specifically includes a driving cylinder 51 fixedly installed at the front end of the cart 1, a double-sided toothed plate 52 fixedly installed on an output shaft of the driving cylinder 51, and two sets of driving gears 53 horizontally disposed and rotatably installed at the front end of the cart 1.

The driving cylinder 51 may be a cylinder, a hydraulic cylinder or an oil cylinder, and the movement direction of the output shaft of the driving cylinder 51 is parallel to the traveling direction of the cart 1; the two groups of driving gears 53 are symmetrically distributed relative to the central line of the cart 1, the two groups of driving gears 53 are respectively and fixedly arranged above the two groups of supporting arms 12, the two groups of supporting arms 12 are respectively and rotatably connected to the front end of the cart 1 through the two groups of driving gears 53, and the two sides of the double-sided toothed plate 52 along the length direction are respectively meshed with the two groups of driving gears 53.

The driving cylinder 51 is utilized to drive the double-sided toothed plates 52 to advance forwards/backwards, so that the driving gear 53 can be driven to drive the support arms 12 to move away from/approach each other conveniently and stably, and the size of the encircling space between the two groups of support arms 12 can be adjusted conveniently and stably.

The implementation principle of the pipe pile head moving and cutting device in embodiment 2 of the application is as follows: while the application of embodiment 1 is simultaneously realized, the application of the application improves the adaptive range of the pile head cutting device to the pile head height, the application of embodiment 2 of the application improves the control of the distance between two groups of support arms 12 in the pile head moving cutting device, the control of the distance between two groups of support arms 12 is simpler and more convenient, the area interval of the opening of the encircling space which can be formed between the two groups of support arms 12 is not limited by the length of the locking screw 41, the whole encircling space area is enlarged, and then the pile head moving cutting device can conveniently cut the pile head with larger diameter, so that the application of the application is higher.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (8)

1. The utility model provides a tubular pile head removes cutting device, includes shallow (1) and installs cutting assembly (2) on shallow (1), its characterized in that: the lower part of the trolley (1) is provided with a plurality of groups of universal wheels (11) for the trolley (1) to move and a lifting assembly (3) for driving the trolley (1) to lift, and the rear end of the trolley (1) is provided with a hand pushing part; the cutting assembly (2) is arranged at the front end of the cart (1), the cutting assembly (2) comprises at least two groups of cutters (21), and the two groups of cutters (21) are symmetrically distributed relative to the central line of the cart (1).

2. A tubular pile head moving and cutting device according to claim 1, wherein: the lifting assembly (3) comprises a fixed seat (31) which is arranged below the trolley (1) in a lifting manner, a driving screw rod (32) which is rotationally connected to the lower portion of the trolley (1) and a driving component which is used for driving the driving screw rod (32) to rotate, wherein the fixed seat (31) is parallel to the bottom wall of the trolley (1), the upper end of the driving screw rod (32) movably penetrates through the bottom wall of the trolley (1) and is perpendicular to the bottom wall of the trolley (1), and the lower end of the driving screw rod is rotationally connected to the fixed seat (31).

3. A tubular pile head moving and cutting device according to claim 2, wherein: the driving part comprises a driving bevel gear (33) connected to the trolley (1), a driven bevel gear (34) coaxially sleeved and assembled on the driving screw rod (32) in a threaded mode, and a hand crank (35) used for driving the driving bevel gear (33) to rotate, wherein the driven bevel gear (34) is rotationally connected to the bottom wall of the trolley (1) around the axis of the driven bevel gear, the driving bevel gear (33) is meshed with the driven bevel gear (34), one end of the hand crank (35) is fixedly connected to the middle part of the driving bevel gear (33) in a coaxial mode, and the other end of the hand crank extends to the rear of the trolley (1).

4. A pipe pile head moving cutting apparatus according to any one of claims 1 to 3, wherein: two groups of horizontal supporting arms (12) which are symmetrical relative to the central line of the trolley (1) are arranged at the front end of the trolley (1), and symmetrical encircling spaces are formed between the two groups of supporting arms (12); the cutters (21) are arranged in two groups, and the two groups of cutters (21) are horizontally and rotatably connected to the two groups of support arms (12) along the direction of approaching/separating from the central line of the encircling space.

5. The movable cutting device for the pile head of the pipe pile according to claim 4, wherein: the two groups of supporting arms (12) are both connected to the front end of the trolley (1) in a rotating mode around a vertical axis, and a locking assembly (4) used for locking rotation of the two groups of supporting arms (12) is arranged between one ends, far away from the trolley (1), of the two groups of supporting arms (12).

6. The movable cutting device for the pile head of the pipe pile according to claim 5, wherein: the locking assembly (4) comprises a locking screw rod (41) with one end hinged to one group of supporting arms (12), a nut (42) assembled on the locking screw rod (41) in a threaded mode and a locking buckle (43) arranged on the rest group of supporting arms (12), and the movable end of the locking screw rod (41) is movably close to/far away from the locking buckle (43) and is matched and buckled with the locking buckle (43).

7. The movable cutting device for the pile head of the pipe pile according to claim 4, wherein: the two groups of supporting arms (12) are both connected to the front end of the cart (1) in a rotating mode around a vertical axis, and a driving assembly (5) for driving the two groups of supporting arms (12) to be close to/far away from each other is arranged at the front end of the cart (1).

8. The pipe pile head moving and cutting device according to claim 7, wherein: the driving assembly (5) comprises a driving cylinder (51) fixedly arranged at the front end of the cart (1), a double-sided toothed plate (52) fixedly arranged on an output shaft of the driving cylinder (51) and two groups of driving gears (53) horizontally arranged and rotatably arranged at the front end of the cart (1); the two groups of driving gears (53) are symmetrically distributed relative to the central line of the trolley (1), the two groups of supporting arms (12) are respectively connected to the front end of the trolley (1) through the two groups of driving gears (53) in a rotating mode, and the two sides of the double-sided toothed plate (52) in the length direction are respectively meshed with the two groups of driving gears (53).