All-in-one machine for rough edge milling and grooving of extruded foamed sheet

Abstract

The utility model relates to the field of foam board processing equipment, in particular to a rough edge milling and grooving all-in-one machine for extruded foam boards, which comprises a rack, two rough milling mechanisms and two grooving mechanisms, the rough milling mechanisms and the grooving mechanisms are sequentially mounted on the rack, and the two rough milling mechanisms and the two grooving mechanisms are sequentially mounted on the rack. The two rough milling mechanisms are installed on the rack through a first displacement mechanism, the first displacement mechanism is used for driving the two rough milling mechanisms to move synchronously, the two grooving mechanisms are installed on the rack through a second displacement mechanism, and the second displacement mechanism is used for driving the two grooving mechanisms to move synchronously. The plate machining device has the effect of improving the plate machining quality.

Description

Technical Field

[0001] The present application relates to the field of foam board processing equipment, and in particular to an all-in-one machine for rough edge milling and grooving of extruded foam boards. Background Art

[0002] Foam board is a new type of roofing board with beautiful appearance, light material, easy installation, and compared with similar sandwich panels, it has the advantages of extremely high heat insulation, sound insulation, fire resistance and long service life.

[0003] In the actual production application process, the foam board is usually processed by milling and slotting. Usually, the plate to be processed needs to be roughly milled and trimmed by a rough milling mechanism first, and then the plate to be processed needs to be slotted for the second time by another slotting mechanism. The plate to be processed needs to be moved twice, and it is difficult to ensure that the centering distances of the rough milling mechanisms and slotting mechanisms on both sides are consistent, which affects the processing quality of the plate. Summary of the invention

[0004] In order to improve the processing quality of the board, the present application provides an all-in-one machine for rough milling and grooving of extruded foamed board.

[0005] The present application provides an all-in-one machine for rough milling and grooving of extruded foamed panels, which adopts the following technical solution:

[0006] A machine for rough milling and grooving of an extruded foam board comprises a frame, a rough milling mechanism and a grooving mechanism, wherein the rough milling mechanism and the grooving mechanism are sequentially mounted on the frame, two rough milling mechanisms and two grooving mechanisms are provided, the two rough milling mechanisms are mounted on the frame via a first displacement mechanism, the first displacement mechanism is used to drive the two rough milling mechanisms to move synchronously, the two grooving mechanisms are mounted on the frame via a second displacement mechanism, and the second displacement mechanism is used to drive the two grooving mechanisms to move synchronously.

[0007] By adopting the above technical scheme, according to the depth of rough milling and trimming required for the plate to be processed, the rough milling mechanisms on both sides are driven by the first displacement mechanism to move synchronously for centering adjustment, and then according to the width of the plate to be processed after rough milling and trimming, the slotting mechanisms on both sides are driven by the second displacement mechanism to move synchronously for centering adjustment. It only takes one rotation of the first displacement mechanism and the second displacement mechanism to complete the position adjustment of the rough milling mechanism and the slotting mechanism for processing the plate to be processed of the same specification. On the one hand, the number of times the rough milling mechanism and the slotting mechanism are adjusted can be shortened. On the other hand, the plate to be processed can be processed uninterruptedly by the adjusted rough milling mechanism and the slotting mechanism, thereby avoiding secondary slotting after rough milling, which may cause deviation in the position of the slotting mechanism and make it difficult to ensure the processing quality.

[0008] In a specific feasible implementation scheme, the first displacement mechanism includes a first hand wheel and a first screw rod, the first screw rod is rotatably connected to the frame, both ends of the first screw rod are provided with threads with opposite spiral directions, the two rough milling mechanisms are threadedly connected to the two ends of the first screw rod, and the second displacement mechanism has the same structure as the first displacement mechanism.

[0009] By adopting the above technical solution, the first hand wheel is rotated, and the first hand wheel drives the first screw rod to rotate. Since threads with opposite spiral directions are arranged at both ends of the first screw rod, the two rough milling mechanisms are threadedly connected to the two ends of the first screw rod, so that the two rough milling mechanisms are driven by the first screw rod to move synchronously in opposite directions or in the same direction, thereby avoiding the problem of inconsistent moving distances of the two rough milling mechanisms due to the two-stage adjustment of the rough milling mechanisms on both sides, thereby improving the processing quality of the plate to be processed. The setting of the second displacement mechanism is similar.

[0010] In a specific possible implementation scheme, the rough milling mechanism includes a rough milling frame, a rough milling motor and a rough milling tool, the rough milling frame is drivingly connected to the first displacement mechanism, the rough milling motor is installed on the rough milling frame, and the rough milling tool is fixedly connected to the output shaft of the rough milling motor.

[0011] By adopting the above technical solution, the rough milling motor drives the rough milling tool to perform rough milling and trimming processing on the plate to be processed, thereby ensuring the rough milling processing quality of the plate to be processed.

[0012] In a specific possible implementation scheme, it also includes a first positioning structure, which includes a first positioning cylinder, a first positioning seat and a first positioning wheel. The first positioning cylinder is installed on the rough milling frame, the first positioning seat is connected to the first positioning cylinder piston rod, and the first positioning wheel is rotatably connected to the first positioning seat.

[0013] By adopting the above technical solution, the first positioning cylinder drives the first positioning seat to move, and the first positioning wheel arranged on the first positioning seat moves accordingly and abuts against the upper surface of the plate to be processed, thereby avoiding vibration of the plate during processing, thereby affecting the quality of rough milling and cutting. At the same time, the first positioning wheel is rotatably connected to the first positioning seat to avoid interference with the transportation of the plate.

[0014] In a specific feasible implementation scheme, it also includes a first limiting structure, which is provided with at least two groups, and the first limiting structure is symmetrically arranged on the rough milling frame on both sides, and the first limiting structure includes a first limiting cylinder and a first limiting plate, and the first limiting cylinder is installed on the rough milling frame, and the first limiting plate is connected to the piston rod of the first limiting cylinder.

[0015] By adopting the above technical solution, the first limiting cylinders on both sides drive the first limiting plates to move, thereby limiting the plate at the center of the rough milling mechanisms on both sides, thereby improving the processing quality of the plate.

[0016] In a specific possible implementation scheme, the slotting mechanism includes a slotting frame, a two-dimensional adjustment frame, a slotting motor and a slotting tool. The slotting frame is drivingly connected to the second displacement mechanism, the two-dimensional adjustment frame is installed on the slotting frame, and the slotting motor is installed on the two-dimensional adjustment frame. The two-dimensional adjustment frame is used to drive the slotting motor to move along the width and height directions of the processed plate, and the slotting tool is connected to the output shaft of the slotting motor.

[0017] By adopting the above technical solution, the slotting motor drives the slotting tool to slot the processed plate, thereby ensuring the slotting processing quality of the processed plate

[0018] In a specific feasible implementation scheme, the two-dimensional adjustment frame includes a radial screw, a radial movable frame, a transverse screw and a transverse movable frame, the radial screw is rotatably connected to the slotted frame, the radial movable frame is drivingly connected to the screw, the transverse screw is rotatably connected to the radial movable frame, the transverse movable frame is drivingly connected to the transverse screw, the slotted motor is installed on the transverse movable frame, a radial handwheel is installed at one end of the radial screw, and a transverse handwheel is installed at one end of the transverse screw.

[0019] By adopting the above technical solution, the radial hand wheel is rotated to drive the radial screw to rotate, the radial screw drives the radial movable frame to move, and then the transverse hand wheel is rotated to drive the transverse screw to rotate, the transverse screw drives the transverse movable frame to move, and drives the slotting motor installed on the transverse movable frame, thereby driving the slotting motor to move along the width and height directions of the processed plate, moving the slotting tool to the appropriate position for slotting processing, thereby improving the processing accuracy of plate slotting.

[0020] In a specific possible implementation scheme, it also includes a second positioning structure, which includes a second positioning cylinder, a second positioning seat and a second positioning wheel. The second positioning cylinder is installed on the slotting frame, the second positioning seat is connected to the second positioning cylinder piston rod, and the second positioning wheel is rotatably connected to the second positioning seat.

[0021] By adopting the above technical solution, the second positioning cylinder drives the second positioning seat to move, and the second positioning wheel arranged on the second positioning seat moves accordingly and abuts against the upper surface of the plate to be processed, thereby avoiding vibration of the plate during processing, thereby affecting the quality of the grooving process. At the same time, the second positioning wheel is rotatably connected to the second positioning seat to avoid interference with the transportation of the plate.

[0022] In a specific feasible implementation scheme, it also includes a second limiting structure, which is provided with at least two groups, and the second limiting structures are symmetrically arranged on the slotted frames on both sides, and the second limiting structure includes a second limiting cylinder and a second limiting plate, the second limiting cylinder is installed on the slotted frame, and the second limiting plate is connected to the piston rod of the second limiting cylinder.

[0023] By adopting the above technical solution, the second limiting cylinders on both sides drive the second limiting plates to move, thereby limiting the plate at the center of the slotting mechanisms on both sides, thereby improving the processing quality of the plate.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. According to the depth of rough milling and trimming required for the plate to be processed, the rough milling mechanisms on both sides are driven to move synchronously through the first displacement mechanism for centering adjustment, and then according to the width of the plate to be processed after rough milling and trimming, the slotting mechanisms on both sides are driven to move synchronously through the second displacement mechanism for centering adjustment. It only takes one rotation of the first displacement mechanism and the second displacement mechanism to complete the position adjustment of the rough milling mechanism and the slotting mechanism for the plate to be processed of the same specification. On the one hand, it can shorten the number of times of adjusting the rough milling mechanism and the slotting mechanism. On the other hand, the plate to be processed can be processed uninterruptedly through the adjusted rough milling mechanism and the slotting mechanism, avoiding secondary slotting after rough milling, which may cause deviation in the position of the slotting mechanism and make it difficult to ensure the processing quality.

[0026] 2. Turn the first hand wheel, and the first hand wheel drives the first screw rod to rotate. Since the two ends of the first screw rod are provided with threads with opposite spiral directions, the two rough milling mechanisms are threadedly connected to the two ends of the first screw rod, so that the two rough milling mechanisms are driven by the first screw rod to move synchronously in opposite directions or in the same direction, avoiding the problem of inconsistent moving distances of the two rough milling mechanisms in the two-stage adjustment of the rough milling mechanisms on both sides, thereby improving the processing quality of the plate to be processed. The second displacement mechanism is set in the same way;

[0027] 3. Turn the radial hand wheel to drive the radial screw to rotate, the radial screw drives the radial moving frame to move, and then turn the transverse hand wheel to drive the transverse screw to rotate, the transverse screw drives the transverse moving frame to move, and drives the slotting motor installed on the transverse moving frame, thereby driving the slotting motor to move along the width and height direction of the processed plate, and moving the slotting tool to the appropriate position for slotting processing, thereby improving the processing accuracy of the plate slotting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the rough milling mechanism in the embodiment of the present application.

[0030] Figure 3 It is a structural schematic diagram of the slotting mechanism in the embodiment of the present application.

[0031] Description of the accompanying drawings: 1, frame; 2, rough milling mechanism; 21, rough milling frame; 22, rough milling motor; 23, first positioning structure; 231, first positioning cylinder; 232, first positioning seat; 233, first positioning wheel; 24, first limiting structure; 241, first limiting cylinder; 242, first limiting plate; 3, slotting mechanism; 31, slotting frame; 32, two-dimensional adjustment frame; 321, radial screw rod; 322, radial moving frame; 3 23. Transverse screw rod; 324. Transverse moving frame; 325. Radial hand wheel; 326. Transverse hand wheel; 33. Slotting motor; 34. Second positioning structure; 341. Second positioning cylinder; 342. Second positioning seat; 343. Second positioning wheel; 35. Second limiting structure; 351. Second limiting cylinder; 352. Second limiting plate; 4. First displacement mechanism; 41. First hand wheel; 42. First screw rod; 5. Second displacement mechanism. DETAILED DESCRIPTION

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0034] The embodiment of the present application discloses an all-in-one machine for rough edge milling and grooving of extruded foamed board.

[0035] like Figure 1 As shown, the extruded foam board rough milling and slotting integrated machine comprises a frame 1, a rough milling mechanism 2, a slotting mechanism 3, a first displacement mechanism 4 and a second displacement mechanism 5. The rough milling mechanism 2 and the slotting mechanism 3 are sequentially mounted on the frame 1, and two rough milling mechanisms 2 and two slotting mechanisms 3 are provided. The two rough milling mechanisms 2 are mounted on the frame 1 through the first displacement mechanism 4, and the two slotting mechanisms 3 are mounted on the frame 1 through the second displacement mechanism 5.

[0036] like Figure 2As shown, the first displacement mechanism 4 includes a first hand wheel 41 and a first screw rod 42. The first screw rod 42 is rotatably connected to the frame 1. Both ends of the first screw rod 42 are provided with threads with opposite spiral directions. The two rough milling mechanisms 2 are threadedly connected to both ends of the first screw rod 42. The first hand wheel 41 is rotated to drive the first screw rod 42. The first screw rod 42 drives the rough milling mechanisms 2 on both sides to move synchronously relative to each other. The second displacement mechanism 5 has the same structure as the first displacement mechanism 4.

[0037] The milling mechanism includes a rough milling frame 21, a rough milling motor 22, a rough milling tool, a first positioning structure 23 and a first limiting structure 24. A rough milling frame slide rod is installed on the frame 1. The rough milling frame 21 is slidably connected to the rough milling frame slide rod. The rough milling frame 21 is threadedly connected to the first screw rod 42. A rough milling support plate is installed on the rough milling frame 21. The rough milling motor 22 is installed on the rough milling frame 21. A clamping sleeve is installed on the output shaft of the rough milling motor 22. The rough milling tool is fixedly connected to the rough milling motor 22 through the clamping sleeve. A rough milling dust suction shell is installed on the rough milling frame 21. The rough milling dust suction shell is connected to an external dust suction device through a hose, so as to suck and clean the waste chips generated by rough milling cutting.

[0038] The first positioning structure 23 is arranged in two groups, and the two groups of first positioning structures 23 are installed on the rough milling frame 21 on both sides. The first positioning structure 23 includes a first positioning cylinder 231, a first positioning seat 232 and a first positioning wheel 233. The first positioning cylinder 231 is installed on the rough milling frame 21, and the first positioning seat 232 is connected to the piston rod of the first positioning cylinder 231. A first sliding rod is installed on the first positioning seat 232, and the first sliding rod is arranged through the rough milling frame 21. Three first positioning wheels 233 are arranged, and the three first positioning wheels 233 are rotatably connected to the first positioning seat 232 in parallel. The rotation direction of the first positioning wheel 233 is consistent with the plate transportation direction.

[0039] The first limiting structure 24 is provided with two groups, and the first limiting structure 24 is symmetrically installed on the rough milling frame 21 on both sides. The first limiting structure 24 includes a first limiting cylinder 241 and a first limiting plate 242. There are multiple first limiting cylinders 241, and the first limiting cylinders 241 are installed on the rough milling frame 21 along the length direction of the plate. The first limiting plate 242 is connected to the piston rod of the first limiting cylinder 241.

[0040] like Figure 3As shown, the slotting mechanism 3 includes a slotting frame 31, a two-dimensional adjustment frame 32, a slotting motor 33, a slotting tool, a second positioning structure 34 and a second limiting structure 35. A slotting frame slide rod is installed on the frame 1. The slotting frame 31 is slidably connected to the slotting frame slide rod. The slotting frame 31 is driven and connected to the second displacement mechanism 5. A slotting support plate is installed on the slotting frame 31. The two-dimensional adjustment frame 32 includes a radial screw rod 321, a radial moving frame 322, a transverse screw rod 323 and a transverse moving frame 324. The radial screw rod 321 is rotatably connected to the slotting frame 31. The radial moving frame 322 is driven and connected to the radial screw rod 321, the transverse screw rod 323 is rotatably connected to the radial moving frame 322, the transverse moving frame 324 is driven and connected to the transverse screw rod 323, the slotting motor 33 is installed on the transverse moving frame 324, a clamping sleeve is installed on the output shaft of the slotting motor 33, the slotting tool is connected to the output shaft of the slotting motor 33 through the clamping sleeve, a slotting dust suction shell is installed on the slotting frame 31, and the slotting dust suction shell is connected to the external dust suction device through a hose, so as to suck and clean the waste chips generated during the slotting process.

[0041] The second positioning structure 34 is arranged in two groups, and the two groups of second positioning structures 34 are installed on the slotting frames 31 on both sides. The second positioning structure 34 includes a second positioning cylinder 341, a second positioning seat 342 and a second positioning wheel 343. The second positioning cylinder 341 is installed on the slotting frame 31, and the second positioning seat 342 is connected to the piston rod of the second positioning cylinder 341. A second sliding rod is installed on the second positioning seat 342, and the second sliding rod is arranged through the rough milling frame 21. Three second positioning wheels 343 are arranged, and the three second positioning wheels 343 are rotatably connected to the second positioning seat 342 in parallel. The rotation direction of the second positioning wheel 343 is consistent with the plate transportation direction.

[0042] The second limiting structure 35 is provided with two groups, and the second limiting structure 35 is symmetrically installed on the slotting frame 31 on both sides. The second limiting structure 35 includes a second limiting cylinder 351 and a second limiting plate 352. There are multiple second limiting cylinders 351, and the second limiting cylinder 351 is installed on the slotting frame 31 along the length direction of the plate. The second limiting plate 352 is connected to the piston rod of the second limiting cylinder 351.

[0043] The implementation principle of the integrated machine for rough milling and grooving of extruded foamed board in the embodiment of the present application is as follows: the first hand wheel 41 is rotated, and the first hand wheel 41 drives the first screw rod 42 to rotate, driving the rough milling frames 21 on both sides to move to the positions required for processing, and the grooving frames 31 on both sides are driven to move to the required processing positions by the second displacement mechanism 5, and the first limiting cylinder 241 and the second limiting cylinder 351 respectively drive the first limiting plate 242 and the second limiting plate 352 to move, and the spacing between the two first limiting plates 242 corresponds to the width setting of the board, and the spacing between the two second limiting plates 352 corresponds to the width setting of the board after rough milling and trimming, and the first positioning cylinder 231 and the second positioning cylinder 341 respectively drive the first positioning seat 232 and the second positioning seat 342 to move, so that the spacing from the first positioning wheel 233 to the rough milling support plate and the second positioning cylinder 341 are The distance between the wheel 343 and the slotting support plate corresponds to the thickness setting of the plate. The radial hand wheel 325 is turned to drive the radial screw 321 to adjust the height position of the radial moving seat. The transverse hand wheel 326 is then turned to drive the transverse screw 323 to adjust the horizontal position of the transverse moving seat, thereby moving the rough milling motors 22 on both sides and the rough milling tools installed on the rough milling motors 22 to appropriate positions, and the rough milling motors 22 and the slotting motors 33 are started respectively to drive the rough milling tools and the slotting motors 33 to rotate. The plate is driven to move through an external moving device, and the plate is rough milled, trimmed and slotted. The plate to be processed is processed uninterruptedly and integratedly through the adjusted rough milling mechanism 2 and slotting mechanism 3, which avoids secondary slotting after rough milling. The position of the slotting mechanism 3 may deviate, resulting in a problem that the processing quality is difficult to guarantee.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An integrated machine for rough milling and grooving of extruded foamed board, characterized in that: The invention comprises a frame (1), a rough milling mechanism (2) and a slotting mechanism (3), wherein the rough milling mechanism (2) and the slotting mechanism (3) are sequentially mounted on the frame (1), two rough milling mechanisms (2) and two slotting mechanisms (3) are each provided, the two rough milling mechanisms (2) are mounted on the frame (1) via a first displacement mechanism (4), the first displacement mechanism (4) is used to drive the two rough milling mechanisms (2) to move synchronously, and the two slotting mechanisms (3) are mounted on the frame (1) via a second displacement mechanism (5), the second displacement mechanism (5) is used to drive the two slotting mechanisms (3) to move synchronously.

2. The extruded foam board rough milling and grooving integrated machine according to claim 1, characterized in that: The first displacement mechanism (4) comprises a first hand wheel (41) and a first screw rod (42); the first screw rod (42) is rotatably connected to the frame (1); two ends of the first screw rod (42) are provided with threads with opposite spiral directions; the two rough milling mechanisms (2) are threadedly connected to the two ends of the first screw rod (42); and the second displacement mechanism (5) has the same structure as the first displacement mechanism (4).

3. The extruded foam board rough milling and grooving integrated machine according to claim 1, characterized in that: The rough milling mechanism (2) comprises a rough milling frame (21), a rough milling motor (22) and a rough milling cutter; the rough milling frame (21) is drivingly connected to the first displacement mechanism (4); the rough milling motor (22) is mounted on the rough milling frame (21); and the rough milling cutter is fixedly connected to an output shaft of the rough milling motor (22).

4. The extruded foam board rough milling and grooving integrated machine according to claim 3, characterized in that: The invention also comprises a first positioning structure (23), wherein the first positioning structure (23) comprises a first positioning cylinder (231), a first positioning seat (232) and a first positioning wheel (233), wherein the first positioning cylinder (231) is mounted on the rough milling frame (21), the first positioning seat (232) is connected to the piston rod of the first positioning cylinder (231), and the first positioning wheel (233) is rotatably connected to the first positioning seat (232).

5. The extruded foam board rough milling and grooving integrated machine according to claim 3, characterized in that: The invention also comprises a first limiting structure (24), wherein the first limiting structure (24) is provided with at least two groups, the first limiting structure (24) is symmetrically arranged on the rough milling frame (21) on both sides, the first limiting structure (24) comprises a first limiting cylinder (241) and a first limiting plate (242), the first limiting cylinder (241) is installed on the rough milling frame (21), and the first limiting plate (242) is connected to the piston rod of the first limiting cylinder (241).

6. The extruded foam board rough milling and grooving integrated machine according to claim 1, characterized in that: The slotting mechanism (3) comprises a slotting frame (31), a two-dimensional adjustment frame (32), a slotting motor (33) and a slotting tool. The slotting frame (31) is drivingly connected to the second displacement mechanism (5). The two-dimensional adjustment frame (32) is mounted on the slotting frame (31). The slotting motor (33) is mounted on the two-dimensional adjustment frame (32). The two-dimensional adjustment frame (32) is used to drive the slotting motor (33) to move along the width and height directions of the processed plate. The slotting tool is connected to the output shaft of the slotting motor (33).

7. The extruded foam board rough milling and grooving integrated machine according to claim 6, characterized in that: The two-dimensional adjustment frame (32) comprises a radial screw rod (321), a radial moving frame (322), a transverse screw rod (323) and a transverse moving frame (324); the radial screw rod (321) is rotatably connected to the slotted frame (31); the radial moving frame (322) is drivingly connected to the radial screw rod (321); the transverse screw rod (323) is rotatably connected to the radial moving frame (322); the transverse moving frame (324) is drivingly connected to the transverse screw rod (323); the slotted motor (33) is mounted on the transverse moving frame (324); a radial hand wheel (325) is mounted on one end of the radial screw rod (321); and a transverse hand wheel (326) is mounted on one end of the transverse screw rod (323).

8. The extruded foam board rough milling and grooving integrated machine according to claim 6, characterized in that: The invention also comprises a second positioning structure (34), wherein the second positioning structure (34) comprises a second positioning cylinder (341), a second positioning seat (342) and a second positioning wheel (343), wherein the second positioning cylinder (341) is installed on the slotting frame (31), the second positioning seat (342) is connected to the piston rod of the second positioning cylinder (341), and the second positioning wheel (343) is rotatably connected to the second positioning seat (342).

9. The extruded foam board rough milling and grooving integrated machine according to claim 6, characterized in that: The invention also comprises a second limiting structure (35), wherein the second limiting structure (35) is provided with at least two groups, and the second limiting structure (35) is symmetrically arranged on the slotted frame (31) on both sides, and the second limiting structure (35) comprises a second limiting cylinder (351) and a second limiting plate (352), wherein the second limiting cylinder (351) is installed on the slotted frame (31), and the second limiting plate (352) is connected to the piston rod of the second limiting cylinder (351).

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