CN113083953A

CN113083953A - Bending ring rolling machine capable of shaping radian of steel plate

Info

Publication number: CN113083953A
Application number: CN202110362683.5A
Authority: CN
Inventors: 郭凡凡
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-07-09

Abstract

The invention relates to the field of bending of steel plates, in particular to a bending ring rolling machine capable of shaping the radian of a steel plate, which comprises a bottom plate, a guide fixing rod, an installation groove plate, an installation plate and the like; the bottom plate is provided with a pair of guide fixing rods, the guide fixing rods are provided with installation groove plates, and the installation groove plates are fixedly connected with installation plates. According to the invention, through the matching of the plate pushing-out assembly and the safety protection assembly, the L-shaped swing rod drives the sliding push rod to push the steel plate bent on the plate placing seat to move a certain distance in the direction away from the fixed seat, and meanwhile, the connecting push rod can push the protection frame to rotate upwards for a certain angle, so that the steel plate bent on the plate placing seat can be conveniently taken out manually, the hand can be prevented from being pressed by the stamping block when the steel plate bent on the plate placing seat is taken out, and the effect of preventing the hand from being injured when the steel plate bent on the plate placing seat is taken out manually is achieved.

Description

Bending ring rolling machine capable of shaping radian of steel plate

Technical Field

The invention relates to the field of bending of steel plates, in particular to a bending and ring rolling machine capable of shaping the radian of a steel plate.

Background

Steel panels are flat rectangular building panels of standard size, which are used in the building industry and are usually bent to a certain curvature before application. Bending and forming are widely applied to manufacturing high-pressure containers, boiler drums, boiler tubes, steel plates and ribs of ship bodies, various vessels, instrument and meter components, cabinet panels and the like.

The conventional method for bending steel plates is to bend the steel plates to be bent by a bending tool manually by a person, so that a large number of steel plates cannot be bent to have the same curvature, the steel plates to be bent cannot be automatically bent, and the person cannot be injured.

Disclosure of Invention

In view of the above, it is necessary to provide a bending and ring rolling machine capable of bending a large number of steel plate materials into a uniform curvature, automatically bending the steel plate materials to be bent, automatically pushing out the bent steel plate materials, and shaping the steel plate materials in a curved shape, which has a guard device.

The technical scheme is as follows: the bending ring rolling machine capable of shaping the radian of a steel plate comprises a bottom plate, guide fixing rods, an installation groove plate, an installation plate, a supporting plate, a reinforcement punching assembly, a plate bending ring assembly and an arc shaping assembly.

Further, the boosting punching component comprises a motor, a power shaft, a cam, a sliding plate, a first connecting rod, a second connecting rod, a third connecting rod, a lifting punching seat, a fixed L-shaped plate, a first compression spring, a punching block and a plate placing seat, wherein the motor is arranged on the supporting plate, the power shaft is arranged on an output shaft of the motor, the cam is arranged on the power shaft, the sliding plate is matched with the mounting groove plate in a common sliding manner, the first connecting rod is rotatably connected between the sliding plate and the cam, the second connecting rod is rotatably connected with the second connecting rod, the third connecting rod is rotatably connected between one end of the second connecting rod, far away from the sliding plate, and the mounting plate, the lifting punching seat is matched with the guiding fixing rod in a common sliding manner, one end of the second connecting rod, far away from the sliding plate, is also rotatably connected with the third connecting rod, the bottom of the lifting stamping seat is provided with a first compression spring, a stamping block is fixedly connected to the first compression spring, the stamping block is in contact with the fixed L-shaped plate, and the bottom plate is provided with a plate placing seat.

Furthermore, the plate bending ring assembly comprises a wedge block, a second compression spring, a second sliding block and an arc-shaped bending ring block, the wedge block is arranged at the bottom of the lifting stamping seat, the sliding block is matched with the sliding block on the bottom plate in a sliding mode, the second compression spring is connected between the sliding block and the bottom plate, the arc-shaped bending ring block is matched with the top of the bottom plate in a sliding mode, and the arc-shaped bending ring block is fixedly connected with the sliding block.

Further, the arc-shaped setting assembly comprises a fixed guide plate, an eccentric oscillating bar, a first pull rod, a second pull rod and a circular setting roller, the top of the bottom plate is provided with the fixed guide plate, the fixed guide plate is rotatably connected with the eccentric oscillating bar, the fixed guide plate is slidably matched with the first pull rod, one end of the first pull rod is slidably matched with the eccentric oscillating bar, the other end of the first pull rod is fixedly connected with one of the sliding blocks, the fixed guide plate is slidably matched with the second pull rod, one end of the second pull rod is slidably matched with the eccentric oscillating bar, and the other end of the second pull rod is rotatably connected with the circular setting roller.

Further, still including panel release subassembly, panel release subassembly is located on the bottom plate, panel release subassembly is including fixed frid, the activity push rod, torsion spring one, a fixed base, L shape pendulum rod, torsion spring two and slip push rod, be equipped with fixed frid on the lift punching press seat, the last rotation type of fixed frid is connected with the activity push rod, be connected with two torsion spring one between activity push rod and the fixed frid, be equipped with the fixed base on the bottom plate, the rotation type is connected with L shape pendulum rod on the fixed base, be connected with two torsion spring two between L shape pendulum rod and the fixed base, the slip type cooperation has slip push rod on the fixed base, slip push rod and the cooperation of L shape pendulum rod slidingtype.

Further, still including the safety protection subassembly, on the bottom plate was located to the safety protection subassembly, the safety protection subassembly was equipped with a pair of backup pad including backup pad, protection frame and connecting push rod on the bottom plate, and common rotary type is connected with the protection frame in the backup pad, is equipped with connecting push rod on the sliding push rod, connecting push rod and the contact of protection frame.

The invention has the beneficial effects that:

according to the invention, through the matching of the plate bending assembly and the arc-shaped setting assembly, the wedge-shaped block can extrude the arc-shaped bending block and the device on the arc-shaped bending block to move towards the direction close to the plate placing seat, so that the steel plate needing to be bent on the plate placing seat is bent by the arc-shaped bending block, the round setting roller is driven by the second pull rod to roll on the steel plate needing to be bent on the plate placing seat, the steel plate bent on the plate placing seat is set by the round setting roller, and the effect of automatically bending and setting the steel plate on the plate placing seat is achieved.

The cooperation of subassembly and safety protection subassembly is released through panel, L shape pendulum rod drives the slip push rod and promotes panel and place the certain distance of the good iron and steel panel of bending towards the direction motion of keeping away from the fixing base on the seat, it can promote the protection frame certain angle of upwards rotating to connect the push rod simultaneously, be convenient for manually place the panel and take out the good iron and steel panel of bending on the seat, can prevent that the hand from being crushed by the ram block when taking out the good iron and steel panel of bending on the seat is placed to the panel, the effect that staff portion is injured when having reached can avoid manually placing the good iron and steel panel of bending on the seat with panel and taking out.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a second embodiment of the present invention.

FIG. 3 is a schematic view of a first partial body configuration of the power punch assembly of the present invention.

FIG. 4 is a schematic diagram of a second partial body configuration of the power punch assembly of the present invention.

FIG. 5 is a perspective view of the arc shaping assembly of the present invention.

Fig. 6 is a partial perspective view of the present invention.

Fig. 7 is an enlarged perspective view of the present invention a.

Fig. 8 is a perspective view of the safety shield assembly of the present invention.

Reference numerals: 1_ bottom plate, 2_ guide fixing rod, 3_ mounting groove plate, 4_ mounting plate, 5_ pallet, 6_ power-increasing punching component, 61_ motor, 62_ power shaft, 63_ cam, 64_ sliding plate, 65_ first connecting rod, 66_ second connecting rod, 67_ third connecting rod, 68_ lifting punching seat, 69_ fixed L-shaped plate, 610_ first compression spring, 611_ punching block, 612_ plate placing seat, 7_ plate bending ring component, 71_ wedge-shaped block, 72_ second compression spring, 73_ sliding block, 74_ arc-shaped bending ring block, 8_ arc-shaped shaping component, 81_ fixed guide plate, 82_ eccentric swinging rod, 83_ first pulling rod, 84_ second pulling rod, 85_ circular shaping roller, 9_ plate pushing component, 91_ fixing groove plate, 92_ push rod, 93_ first torsion spring, 94_ fixed seat, 95_ L-shaped torsion spring, 96_ second torsion spring, 97_ sliding push rod, 10_ safety protection component, 101_ support plate, 102_ protection frame, 103_ connection push rod.

Detailed Description

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description and the description of the attached drawings, and the specific connection mode of each part adopts the conventional means of mature bolts, rivets, welding, sticking and the like in the prior art, and the detailed description is not repeated.

Example 1

A bending ring rolling machine capable of shaping the radian of a steel plate, which comprises a bottom plate 1, a guide fixing rod 2, an installation groove plate 3 and an installation plate 4 as shown in figures 1 to 8, the steel plate bending and shaping device comprises a supporting plate 5, a boosting punching assembly 6, a plate bending assembly 7 and an arc-shaped shaping assembly 8, wherein a pair of guide fixing rods 2 are arranged on a bottom plate 1, mounting groove plates 3 are arranged on the guide fixing rods 2, mounting plates 4 are fixedly connected to the mounting groove plates 3 together, the supporting plate 5 is arranged on the mounting plates 4, the boosting punching assembly 6 is arranged on the supporting plate 5, the boosting punching assembly 6 is used for compressing steel plates needing to be bent on a plate placing seat 612, the plate bending assembly 7 is arranged on the boosting punching assembly 6, the plate bending assembly 7 is used for bending the steel plates needing to be bent on the plate placing seat 612, the arc-shaped shaping assembly 8 is arranged on the bottom plate 1, and the arc-shaped shaping assembly 8 is used for.

The boosting punching component 6 comprises a motor 61, a power shaft 62, a cam 63, a sliding plate 64, a first connecting rod 65, a second connecting rod 66, a third connecting rod 67, a lifting punching seat 68, a fixed L-shaped plate 69, a first compression spring 610, a punching block 611 and a plate placing seat 612, wherein the motor 61 is installed on the supporting plate 5, the power shaft 62 is arranged on an output shaft of the motor 61, the cam 63 is arranged on the power shaft 62, the sliding plate 64 is jointly matched with the mounting groove plate 3 in a sliding manner, the first connecting rod 65 is rotatably connected between the sliding plate 64 and the cam 63, the second connecting rod 66 is rotatably connected on the sliding plate 64, the third connecting rod 67 is rotatably connected between one end of the second connecting rod 66 far away from the sliding plate 64 and the mounting plate 4, the lifting punching seat 68 is jointly matched with the guiding fixing rod 2 in a sliding manner, the lifting punching seat 68 is used for driving the fixed L-shaped plate 69 to reciprocate up and down, the pair of connecting rods three 67 is in contact with the other pair of connecting rods three 67, the bottom of the lifting stamping seat 68 is provided with two fixed L-shaped plates 69, the fixed L-shaped plates 69 are used for driving the stamping block 611 to move upwards, the bottom of the lifting stamping seat 68 is provided with a first compression spring 610, the first compression spring 610 is used for increasing the pressure of the stamping block 611 for extruding the steel plate needing to be bent on the plate placing seat 612, the first compression spring 610 is fixedly connected with the stamping block 611, the stamping block 611 is used for pressing the steel plate needing to be bent on the plate placing seat 612, the stamping block 611 is in contact with the fixed L-shaped plates 69, and the plate placing seat 612 is arranged on the bottom.

The plate bending assembly 7 comprises a wedge block 71, a second compression spring 72, a sliding block 73 and an arc-shaped bending block 74, the wedge block 71 is arranged at the bottom of the lifting stamping seat 68, the wedge block 71 is used for extruding the arc-shaped bending block 74 and an upper device of the arc-shaped bending block to move towards the direction close to the plate placing seat 612, a pair of sliding blocks 73 are slidably matched on the bottom plate 1, the sliding blocks 73 are used for driving the first pull rod 83 to reciprocate, the second compression spring 72 is connected between the sliding blocks 73 and the bottom plate 1 and used for driving the sliding blocks 73 to reset, the arc-shaped bending block 74 is slidably matched at the top of the bottom plate 1 and used for bending the steel plate sliding block needing to be bent on the plate placing seat 612, and the arc-shaped bending block 74 is fixedly connected with the sliding.

The arc-shaped setting assembly 8 comprises a fixed guide plate 81, an eccentric swing rod 82, a first pull rod 83, a second pull rod 84 and a circular setting roller 85, the top of the base plate 1 is provided with the fixed guide plate 81, the eccentric swing rod 82 is rotatably connected to the fixed guide plate 81, the eccentric swing rod 82 is used for driving the second pull rod 84 to reciprocate, the first pull rod 83 is slidably matched with the fixed guide plate 81 and is used for driving the eccentric swing rod 82 to rotate, one end of the first pull rod 83 is slidably matched with the eccentric swing rod 82, the other end of the first pull rod 83 is fixedly connected with one of the sliding blocks 73, the second pull rod 84 is slidably matched with the fixed guide plate 81, one end of the second pull rod 84 is slidably matched with the eccentric swing rod 82, the other end of the second pull rod 84 is rotatably connected with the circular setting roller 85, and the circular setting roller 85 is used for setting the steel plate bent on.

The protection frame 102 is manually opened, steel plates needing to be bent are placed on the plate placing seat 612 manually, the motor 61 is controlled to be started manually, the power shaft 62 and the device on the power shaft are enabled to rotate when the motor 61 is started, the cam 63 can drive the sliding plate 64 and the device on the sliding plate 64 to reciprocate up and down under the action of the first connecting rod 65, the sliding plate 64 can drive the third connecting rod 67 to swing back and forth under the action of the second connecting rod 66, and then the lifting punching seat 68 and the device on the sliding plate can reciprocate up and down.

When the lifting punching seat 68 and the upper device thereof move downwards, the punching block 611 contacts with the steel plate to be bent on the plate placing seat 612, the compression spring one 610 is compressed accordingly, so that the punching block 611 presses the steel plate to be bent on the plate placing seat 612, the wedge block 71 contacts with the arc-shaped bending block 74, the wedge block 71 presses the arc-shaped bending block 74 and the upper device thereof to move towards the direction close to the plate placing seat 612, the compression spring two 72 is compressed accordingly, so that the arc-shaped bending block 74 bends the steel plate to be bent on the plate placing seat 612, and the arc-shaped bending block 74 and the upper device thereof move towards the direction close to the plate placing seat 612, so that the eccentric swing rod 82 swings by a certain angle, and the pull rod two 84 drives the circular shaping roller 85 to roll on the steel plate to be bent on the plate placing seat 612, at this time, the circular shaping roller 85 and the arc-shaped loop bending block 74 move in the direction of approaching to each other, the circular shaping roller 85 and the arc-shaped loop bending block 74 clamp the bent portion of the steel plate on the plate placing seat 612, and the circular shaping roller 85 shapes the steel plate bent on the plate placing seat 612.

When the lifting punching seat 68 and the upper device thereof move upwards, the punching block 611 can be separated from the steel plate bent on the plate placing seat 612, the first compression spring 610 can reset along with the punching block, the wedge block 71 can be separated from the arc-shaped ring bending block 74, the arc-shaped ring bending block 74 and the upper device thereof can reset under the resetting action of the second compression spring 72, and meanwhile, the first pull rod 83 can drive the eccentric swing rod 82 to reset, so that the second pull rod 84 drives the circular shaping roller 85 to reset, and the circular shaping roller 85 and the arc-shaped ring bending block 74 can loosen the steel plate bent on the plate placing seat 612.

Example 2

On the basis of embodiment 1, as shown in fig. 7, the steel plate bending device further includes a plate pushing assembly 9, the plate pushing assembly 9 is disposed on the bottom plate 1, the plate pushing assembly 9 is used for pushing out a steel plate bent on the plate placing seat 612, the plate pushing assembly 9 includes a fixed slot plate 91, a movable push rod 92, a first torsion spring 93, a fixed seat 94, an L-shaped swing rod 95, a second torsion spring 96 and a sliding push rod 97, the lifting punch seat 68 is provided with a fixed slot plate 91, the fixed slot plate 91 is rotatably connected with the movable push rod 92, the movable push rod 92 is used for pushing the L-shaped swing rod 95 and the upper device thereof to rotate for a certain angle, two first torsion springs 93 are connected between the movable push rod 92 and the fixed slot plate 91, the first torsion spring 93 is used for driving the movable push rod 92 to reset, the fixed seat 94 is disposed on the bottom plate 1, the fixed seat 94 is rotatably connected with the L-shaped swing rod 95, two torsion springs, the second torsion spring 96 is used for driving the L-shaped swing rod 95 to reset, the fixed seat 94 is slidably matched with a sliding push rod 97, the sliding push rod 97 is used for pushing the steel plate bent on the plate placing seat 612 to move for a certain distance in the direction away from the fixed seat 94, and the sliding push rod 97 is slidably matched with the L-shaped swing rod 95.

When the lifting stamping seat 68 and the upper device thereof move downwards, the movable push rod 92 will contact with the L-shaped swing rod 95, under the cooperation of the fixed seat 94, the L-shaped swing link 95 will extrude the movable push rod 92 to rotate a certain angle, the first torsion spring 93 will be compressed accordingly, then the movable push rod 92 will be separated from the L-shaped swing link 95, the movable push rod 92 will be reset under the reset action of the first torsion spring 93, when the lifting stamping seat 68 and the device thereon move upwards, the movable push rod 92 will contact the L-shaped swing link 95 again, the movable push rod 92 will push the L-shaped swing link 95 and the device thereon to rotate a certain angle, so that the L-shaped swing link 95 drives the sliding push rod 97 to push the bent steel plate on the plate placing seat 612 to move a certain distance in a direction away from the fixed seat 94, then, the steel plate material bent on the plate material placing seat 612 is manually taken out, so that a human hand can be prevented from being crushed by the punching block 611 when the steel plate material bent on the plate material placing seat 612 is manually taken out.

Example 3

On the basis of embodiment 2, as shown in fig. 8, the safety protection device further includes a safety protection assembly 10, the safety protection assembly 10 is disposed on the bottom plate 1, the safety protection assembly 10 is used for preventing hands from being crushed by the punching block 611 when a steel plate on the plate placing base 612 is bent, the safety protection assembly 10 includes a supporting plate 101, a protection frame 102 and a connecting push rod 103, the connecting push rod 103 is used for pushing the protection frame 102 to rotate upwards by a certain angle, the bottom plate 1 is provided with a pair of supporting plates 101, the supporting plate 101 is connected with the protection frame 102 in a common rotating manner, the sliding push rod 97 is provided with the connecting push rod 103, and the connecting push rod 103 is in contact with the protection frame 102.

When the sliding push rod 97 pushes the well bent steel plate on the plate placing seat 612 to move a certain distance in the direction away from the fixed seat 94, the sliding push rod 97 can drive the connecting push rod 103 to move in the direction away from the fixed seat 94, so that the connecting push rod 103 pushes the protection frame 102 to rotate upwards by a certain angle, the well bent steel plate on the plate placing seat 612 can be taken out manually, the protection frame 102 can prevent other objects from falling into the equipment when the steel plate on the plate placing seat 612 is bent, and the hands can be prevented from being pressed by the stamping block 611 when the steel plate on the plate placing seat 612 is bent.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a can be with crooked book ring rolling machine of iron and steel panel radian setting, a serial communication port, including bottom plate (1), direction dead lever (2), installation frid (3), mounting panel (4), layer board (5), reinforcement punching press subassembly (6), panel looper subassembly (7) and arc setting subassembly (8), be equipped with a pair of direction dead lever (2) on bottom plate (1), be equipped with installation frid (3) on direction dead lever (2), common rigid coupling has mounting panel (4) on installation frid (3), be equipped with layer board (5) on mounting panel (4), be equipped with reinforcement punching press subassembly (6) on layer board (5), be equipped with panel looper subassembly (7) on reinforcement punching press subassembly (6), be equipped with arc setting subassembly (8) on bottom plate (1).

2. The bending ring rolling machine capable of shaping the radian of a steel plate according to claim 1, wherein the boosting punching assembly (6) comprises a motor (61), a power shaft (62), a cam (63), a sliding plate (64), a first connecting rod (65), a second connecting rod (66), a third connecting rod (67), a lifting punching seat (68), a fixed L-shaped plate (69), a first compression spring (610), a punching block (611) and a plate placing seat (612), the supporting plate (5) is provided with the motor (61), an output shaft of the motor (61) is provided with the power shaft (62), the cam (63) is arranged on the power shaft (62), the sliding plate (64) is jointly matched with the sliding plate (3) in a sliding manner, the first connecting rod (65) is rotatably connected between the sliding plate (64) and the cam (63), the sliding plate (64) is rotatably connected with the second connecting rod (66), the rotary type is connected with third connecting rod (67) between one end of second connecting rod (66) far away from sliding plate (64) and mounting panel (4), common sliding type cooperation has lift punching press seat (68) on direction dead lever (2), the one end of second connecting rod (66) far away from sliding plate (64) is the same and lift punching press seat (68) between the rotary type be connected with third connecting rod (67), wherein a pair of third connecting rod (67) and another contact to third connecting rod (67), lift punching press seat (68) bottom is equipped with two fixed L shaped plate (69), lift punching press seat (68) bottom is equipped with compression spring (610), the rigid coupling has punching press piece (611) on compression spring (610), punching press piece (611) and fixed L shaped plate (69) contact, be equipped with panel on bottom plate (1) and place seat (612).

3. The bending and ring rolling machine capable of shaping the radian of a steel plate as claimed in claim 2, wherein the plate bending ring assembly (7) comprises a wedge block (71), a second compression spring (72), a sliding block (73) and an arc-shaped bending ring block (74), the wedge block (71) is arranged at the bottom of the lifting stamping seat (68), a pair of sliding blocks (73) are slidably matched on the bottom plate (1), the second compression spring (72) is connected between the sliding blocks (73) and the bottom plate (1), the arc-shaped bending ring block (74) is slidably matched at the top of the bottom plate (1), and the arc-shaped bending ring block (74) is fixedly connected with the sliding block (73).

4. A curved ring rolling machine capable of arc-shaping steel plate according to claim 3, the arc-shaped forming assembly (8) is characterized by comprising a fixed guide plate (81), an eccentric swing rod (82), a first pull rod (83), a second pull rod (84) and a circular forming roller (85), wherein the fixed guide plate (81) is arranged at the top of a base plate (1), the eccentric swing rod (82) is rotatably connected to the fixed guide plate (81), the first pull rod (83) is slidably matched with the fixed guide plate (81), one end of the first pull rod (83) is slidably matched with the eccentric swing rod (82), the other end of the first pull rod (83) is fixedly connected with one of sliding blocks (73), the second pull rod (84) is slidably matched with the fixed guide plate (81), one end of the second pull rod (84) is slidably matched with the eccentric swing rod (82), and the other end of the second pull rod (84) is rotatably connected with the circular forming roller (85).

5. The bending ring rolling machine capable of shaping the radian of a steel plate according to claim 4, further comprising a plate pushing assembly (9), wherein the plate pushing assembly (9) is arranged on the base plate (1), the plate pushing assembly (9) comprises a fixed slotted plate (91), a movable push rod (92), a first torsion spring (93), a fixed seat (94), an L-shaped swing rod (95), a second torsion spring (96) and a sliding push rod (97), the lifting stamping seat (68) is provided with the fixed slotted plate (91), the fixed slotted plate (91) is rotatably connected with the movable push rod (92) on the fixed slotted plate (91), two first torsion springs (93) are connected between the movable push rod (92) and the fixed slotted plate (91), the fixed seat (94) is arranged on the base plate (1), the L-shaped swing rod (95) is rotatably connected on the fixed seat (94), two second torsion springs (96) are connected between the L-shaped swing rod (95) and the fixed seat (94), the fixed seat (94) is matched with a sliding push rod (97) in a sliding way, and the sliding push rod (97) is matched with the L-shaped swing rod (95) in a sliding way.

6. The ring bending and rolling machine capable of shaping the radian of a steel plate according to claim 5, further comprising a safety protection assembly (10), wherein the safety protection assembly (10) is arranged on the base plate (1), the safety protection assembly (10) comprises a support plate (101), a protection frame (102) and a connecting push rod (103), a pair of support plates (101) are arranged on the base plate (1), the support plates (101) are jointly and rotatably connected with the protection frame (102), the sliding push rod (97) is provided with the connecting push rod (103), and the connecting push rod (103) is in contact with the protection frame (102).