Cutter tool of double housing planer

Abstract

The invention relates to the technical field of double housing planers, in particular to a double housing planer cutter tool which comprises a lifting cross beam, a strip-shaped groove is formed in the outer wall of one side of the lifting cross beam, an electric sliding rail is fixedly connected to the inner wall of the strip-shaped groove, and a cutter base with the section of a T-shaped structure is slidably connected to the electric sliding rail. Only the adjusting assembly is mounted on the outer wall of one side of the tool base, the mounting mechanism is mounted at one end of the adjusting assembly, and the tool frame mechanism is mounted in the mounting mechanism. The device overcomes the defects in the prior art, the mounting mechanism is arranged on the adjusting assembly, the angle of the tool frame mechanism can be adjusted through the mounting mechanism, then the angle of a tool is adjusted, and the height of the tool is conveniently and finely adjusted through the adjusting assembly; therefore, the problem that an existing double housing planer cutter is inconvenient to adjust is solved.

Description

Technical Field

[0001] The invention relates to the technical field of planers, in particular to a tool tooling for a planer. Background Art

[0002] The planer is mainly used for planing large workpieces. It can also clamp multiple parts on the workbench for simultaneous processing. It is the mother machine of industry. The workbench of the planer carries the workpiece through the portal frame for linear reciprocating motion. The idle stroke speed is greater than the working stroke speed. There are generally two vertical tool holders on the crossbeam. The tool holder slide can rotate an angle in the vertical plane and can make lateral feed motion along the crossbeam.

[0003] The cutters on the existing gantry planer can only move up and down, and the cutters are directly mounted on the tool holder by bolts, which leads to the problem that the cutters on the planer are inconvenient to adjust. The cutters are adjusted according to workpieces of different specifications, which leads to a decrease in the processing efficiency of the planer. Summary of the invention

[0004] The purpose of the present invention is to solve or at least alleviate the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gantry planer tool fixture, comprising a lifting beam, a strip groove is formed on one side outer wall of the lifting beam, and an electric slide rail is fixedly connected to the inner wall of the strip groove, a tool seat with a T-shaped cross section is slidably connected to the electric slide rail, only an adjustment component is installed on one side outer wall of the tool seat, and a mounting mechanism is installed at one end of the adjustment component, and a tool holder mechanism is installed inside the mounting mechanism.

[0006] By adopting the above structure, the tool is installed through the tool holder mechanism. The setting of the installation mechanism is convenient for connecting the adjustment component and the tool holder mechanism. The setting of the electric slide rail is convenient for driving the tool to move horizontally. The lifting beam cooperates with the lifting component on the gantry planer to drive the tool to move up and down.

[0007] The adjustment assembly comprises an adjustment box fixedly connected to the tool seat, and the inner wall of the adjustment box is slidably connected to a driving seat of a T-shaped structure.

[0008] By adopting the above structure, the drive seat can be conveniently installed by sliding through the setting of the adjustment box, and the T-shaped drive seat can conveniently limit the drive seat from leaving the adjustment box.

[0009] The inner wall of the regulating box is rotatably connected to two screw rods, the driving seat is screwed on the outer walls of the two screw rods, one end of the two screw rods is fixedly connected to gear 2, the top inner wall of the regulating box is rotatably connected to gear 1, and gear 1 and the two gears 2 are meshed with each other, the top outer wall of the regulating box is rotatably connected to a rotating disk, and one end of the rotating disk transmission shaft is fixedly connected to gear 1.

[0010] By adopting the above structure, the rotating disk drives gear one to rotate, and when gear one rotates, it directly drives two gears two to rotate, and when gear two rotates, it directly drives two screws to rotate, and when the screws rotate, it directly drives the driving seat to move, thereby facilitating the installation mechanism to adjust the height.

[0011] The mounting mechanism includes a U-shaped seat fixedly connected to the driving seat, and the outer walls on both sides of the U-shaped seat are fixedly connected to a chassis, one side outer wall of one chassis is rotatably connected to a handwheel, and the outer wall on the opposite side of the U-shaped seat is rotatably connected to a rotating seat, and the cross-section of the rotating seat is a U-shaped structure, and the outer wall on one side of the rotating seat is provided with tooth grooves.

[0012] By adopting the above structure, the U-shaped seat can be easily installed and fixed by setting the driving seat, the two rotating seats in the U-shaped seat can be easily installed by the auxiliary tool holder mechanism, and the tooth groove can be easily fixed by the auxiliary tool holder mechanism.

[0013] The tool holder mechanism comprises a connecting seat, and the connecting seat is inserted between two rotating seats, one end of the connecting seat is fixedly connected to the tool holder, and the inner wall of the tool holder is fixedly connected to the tool by bolts.

[0014] By adopting the above structure, the connecting seat and the two rotating seats cooperate with each other, which makes it convenient to install the connecting seat, the setting of the tool holder makes it convenient to install and fix the tool, and the bolt connection method makes it convenient to disassemble the tool.

[0015] The connection seat has an installation cavity inside, and the inner walls on both sides of the installation cavity have rectangular openings, the inner walls of the two rectangular openings are slidably connected with racks, and the specifications of the racks match the specifications of the tooth grooves.

[0016] By adopting the above structure, the two racks can be conveniently installed by sliding through the installation cavity, and the connecting seat can be conveniently fixed on the rotating seat when the racks and the tooth grooves are engaged.

[0017] The inner walls on both sides of the installation cavity are rotatably connected to the same bidirectional screw, and the outer wall of the bidirectional screw is threadedly connected to two symmetrically arranged threaded sleeves, the outer walls of the two threaded sleeves are rotatably connected to two support plates, and one end of the four support plates is respectively rotatably connected to the two racks, the outer wall of one side of the connecting seat is rotatably connected to a rotating part, and one end of the transmission shaft of the rotating part is fixedly connected to the bidirectional screw.

[0018] By adopting the above structure, the bidirectional screw can be directly driven to rotate through the rotating part. When the bidirectional screw rotates, it directly drives the two threaded sleeves to move toward or away from each other. When the two threaded sleeves move toward each other, the two racks are directly pushed to move away from each other through the support plate. When the two threaded sleeves move toward each other, the two racks are directly driven to move toward each other, thereby realizing quick disassembly and assembly of the connecting seat.

[0019] The inner wall of one side of the chassis is rotatably connected to gear three, and one end of the gear three transmission shaft is connected to the rotating seat, the inner wall of the chassis is slidably connected to a limit rack that meshes with gear three, and one end of the handwheel transmission shaft is fixedly connected to gear three.

[0020] By adopting the above structure, the gear three and the rotating seat in the chassis rotate coaxially, and the setting of the limiting rack facilitates the limitation of the rotation of the gear three, thereby ensuring the stability of the rotating seat.

[0021] Two symmetrically arranged telescopic rods are fixedly connected to the inner wall of one side of the chassis, and the outer walls of the two telescopic rods are sleeved with springs, one end of the two telescopic rods is fixedly connected to the limiting rack, an opening is opened on the outer wall of one side of the chassis, and the inner wall of the opening is slidably connected to a pull rod, and one end of the pull rod is fixedly connected to the limiting rack.

[0022] By adopting the above structure, when the angle of the tool needs to be adjusted, first pull the pull rod to drive the limit rack to compress the spring on the telescopic rod, thereby directly driving the limit rack away from gear three, and then drive gear three to drive the rotating seat to rotate through the hand wheel, so as to adjust the angle of the tool. After the adjustment is completed, release the pull rod, the limit rack and gear three engage, thereby ensuring the stability of the tool.

[0023] Two symmetrically arranged dampers are fixedly connected to the inner wall of one side of the chassis, and one end of the two dampers is fixedly connected to the limit rack. A threaded opening is opened on the outer wall of one side of the chassis, and an adjusting screw is screwed on the inner wall of the threaded opening, and one end of the adjusting screw is rotatably connected to the limit rack.

[0024] By adopting the above structure, the limiting rack is driven away from gear three by rotating the adjusting screw, and then gear three is driven to drive the rotating seat to rotate by the hand wheel, so as to adjust the angle of the tool. After the adjustment is completed, the adjusting screw is rotated in the opposite direction to drive the limiting rack and gear three to mesh to ensure the stability of the tool.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a mounting mechanism on the adjustment component. The mounting mechanism can adjust the angle of the tool holder mechanism, thereby adjusting the angle of the tool. The setting of the adjustment component facilitates fine adjustment of the height of the tool, thereby solving the problem of inconvenient tool adjustment of the existing planer. (2) The present invention achieves fine adjustment of the height of the tool by driving two screws in the adjustment assembly to rotate and drive the drive seat to move. The cooperation between the rotating disk and the gear 1 facilitates the rapid adjustment of the height of the tool, thereby facilitating the matching of workpieces of different specifications. (3) The present invention provides two adjustable racks on the connecting seat. When the racks are extended and inserted into the tooth grooves, the connecting seat can be fixed on the rotating seat. The rotating part in the connecting seat can directly drive the bidirectional screw to rotate, thereby facilitating the direct adjustment of the positions of the two racks, thereby facilitating the rapid disassembly and assembly of the tool, and facilitating the maintenance and replacement of the tool at a later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the adjustment component of the present invention; Figure 4 It is a schematic diagram of the installation mechanism structure of the present invention; Figure 5 It is a schematic diagram of the U-shaped seat structure of the present invention; Figure 6 It is a schematic diagram of the structure of the tool holder mechanism of the present invention; Figure 7 It is a schematic cross-sectional structural diagram of the connecting seat of the present invention; Figure 8 This is a schematic diagram of a cross-sectional structure of a chassis according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of the cross-sectional structure of the chassis of Embodiment 2 of the present invention.

[0027] In the figure: 1. lifting beam; 2. tool seat; 3. adjustment component; 4. installation mechanism; 5. tool holder mechanism; 6. U-shaped seat; 7. chassis; 8. hand wheel; 9. rotating seat; 10. tooth groove; 11. connecting seat; 12. tool holder; 13. tool; 14. rack; 15. rotating part; 16. adjustment box; 17. rotating disk; 18. gear one; 19. gear two; 20. screw; 21. driving seat; 22. installation cavity; 23. bidirectional screw; 25. threaded sleeve; 26. support plate; 27. gear three; 28. limit rack; 29. ​​pull rod; 30. telescopic rod; 31. spring; 32. adjusting screw; 33. damper. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1 See also Figure 1-8A tool tooling for a gantry planer includes a lifting beam 1, an outer wall of one side of the lifting beam 1 is provided with a strip groove, and the inner wall of the strip groove is fixedly connected with an electric slide rail, a tool seat 2 with a T-shaped cross section is slidably connected to the electric slide rail, and only an adjusting component 3 is installed on the outer wall of one side of the tool seat 2, and a mounting mechanism 4 is installed at one end of the adjusting component 3, a tool holder mechanism 5 is installed inside the mounting mechanism 4, the tool is installed through the tool holder mechanism 5, the setting of the mounting mechanism 4 is convenient for connecting the adjusting component 3 and the tool holder mechanism 5, the setting of the electric slide rail is convenient for driving the tool to move horizontally, and the lifting beam 1 cooperates with the lifting component on the gantry planer to drive the tool to move up and down.

[0030] For details, please refer to Figure 2-3 The adjustment component 3 includes an adjustment box 16 fixedly connected to the tool seat 2, and the inner wall of the adjustment box 16 is slidably connected to a T-shaped driving seat 21. The setting of the adjustment box 16 facilitates the sliding installation of the driving seat 21, and the T-shaped driving seat 21 conveniently limits the driving seat 21 from detaching from the adjustment box 16.

[0031] For details, please refer to Figure 3 The inner wall of the adjusting box 16 is rotatably connected to two screw rods 20, and the driving seat 21 is screwed on the outer walls of the two screw rods 20. One end of the two screw rods 20 is fixedly connected to a gear 2 19. The top inner wall of the adjusting box 16 is rotatably connected to a gear 18, and the gear 1 18 and the two gear 2s 19 are meshed with each other. The top outer wall of the adjusting box 16 is rotatably connected to a rotating disk 17, and one end of the transmission shaft of the rotating disk 17 is fixedly connected to the gear 1 18. The gear 1 18 is driven to rotate by the rotating disk 17. When the gear 1 18 rotates, the two gear 2s 19 are directly driven to rotate. When the gear 2 19 rotates, the two screw rods 20 are directly driven to rotate. When the screw 20 rotates, the driving seat 21 is directly driven to move, thereby facilitating the installation mechanism 4 to be driven to adjust its height.

[0032] For details, please refer to Figure 2 , Figure 4 and Figure 5 The mounting mechanism 4 includes a U-shaped seat 6 fixedly connected to the driving seat 21, and the outer walls on both sides of the U-shaped seat 6 are fixedly connected to the chassis 7, one side outer wall of one chassis 7 is rotatably connected to a hand wheel 8, and the outer wall on the opposite side of the U-shaped seat 6 is rotatably connected to a rotating seat 9, and the cross-section of the rotating seat 9 is a U-shaped structure, and one side outer wall of the rotating seat 9 is provided with a tooth groove 10. The setting of the driving seat 21 facilitates the installation and fixation of the U-shaped seat 6. The setting of the two rotating seats 9 in the U-shaped seat 6 facilitates the installation of the auxiliary tool holder mechanism 5, and the setting of the tooth groove 10 facilitates the fixation of the auxiliary tool holder mechanism 5.

[0033] For details, please refer to Figure 6-7The tool holder mechanism 5 includes a connecting seat 11, and the connecting seat 11 is inserted between the two rotating seats 9. One end of the connecting seat 11 is fixedly connected to a tool holder 12, and the inner wall of the tool holder 12 is fixedly connected to a tool 13 by bolts. The connecting seat 11 and the two rotating seats 9 cooperate with each other to facilitate the installation of the connecting seat 11. The setting of the tool holder 12 facilitates the installation and fixation of the tool 13, and the bolt connection method facilitates the disassembly of the tool 13.

[0034] For details, please refer to Figure 7 An installation cavity 22 is provided inside the connecting seat 11, and rectangular openings are provided on the inner walls on both sides of the installation cavity 22. Racks 14 are slidably connected to the inner walls of the two rectangular openings. The specifications of the racks 14 match the specifications of the tooth grooves 10. The opening of the installation cavity 22 facilitates the sliding installation of the two racks 14. When the racks 14 and the tooth grooves 10 are engaged, it is convenient to fix the connecting seat 11 on the rotating seat 9.

[0035] For details, please refer to Figure 7 The inner walls of both sides of the mounting cavity 22 are rotatably connected with the same bidirectional screw 23, and the outer wall of the bidirectional screw 23 is screwed with two symmetrically arranged threaded sleeves 25, the outer walls of the two threaded sleeves 25 are rotatably connected with two support plates 26, and one end of the four support plates 26 is rotatably connected to the two racks 14 respectively, and the outer wall of one side of the connecting seat 11 is rotatably connected with a rotating part 15, and one end of the transmission shaft of the rotating part 15 is fixedly connected to the bidirectional screw 23, and the bidirectional screw 23 is directly driven to rotate by the rotating part 15. When the bidirectional screw 23 rotates, the two threaded sleeves 25 are directly driven to move toward or away from each other. When the two threaded sleeves 25 move toward each other, the two racks 14 are directly pushed to move away from each other through the support plate 26. When the two threaded sleeves 25 move toward each other, the two racks 14 are directly driven to move toward each other, thereby realizing the quick disassembly and assembly of the connecting seat 11.

[0036] For details, please refer to Figure 7 The inner wall of one side of the chassis 7 is rotatably connected with a gear three 27, and one end of the transmission shaft of the gear three 27 is connected to the rotating seat 9. The inner wall of the chassis 7 is slidably connected with a limit rack 28 that meshes with the gear three 27. One end of the transmission shaft of the handwheel 8 is fixedly connected to the gear three 27. Through the coaxial rotation of the gear three 27 and the rotating seat 9 in the chassis 7, the setting of the limit rack 28 facilitates the limitation of the rotation of the gear three 27, thereby ensuring the stability of the rotating seat 9.

[0037] For details, please refer to Figure 8Two symmetrically arranged telescopic rods 30 are fixedly connected to the inner wall of one side of the chassis 7, and the outer walls of the two telescopic rods 30 are sleeved with springs 31, one end of the two telescopic rods 30 is fixedly connected to the limit rack 28, an opening is opened on the outer wall of one side of the chassis 7, and a pull rod 29 is slidably connected to the inner wall of the opening, one end of the pull rod 29 is fixedly connected to the limit rack 28, when the angle of the tool 13 needs to be adjusted, first pull the pull rod 29 to drive the limit rack 28 to compress the spring 31 on the telescopic rod 30, thereby directly driving the limit rack 28 away from the gear three 27, and then drive the gear three 27 to drive the rotating seat 9 to rotate through the hand wheel 8, so as to adjust the angle of the tool 13, and release the pull rod 29 after the adjustment is completed, and the limit rack 28 and the gear three 27 are engaged, thereby ensuring the stability of the tool 13.

[0038] Embodiment 2 Based on Example 1, this example introduces a specific structure of a chassis 7 in a planer tool tooling. Fig. 9 As shown, two symmetrically arranged dampers 33 are fixedly connected to the inner wall of one side of the chassis 7, and one end of the two dampers 33 is fixedly connected to the limit rack 28. A threaded opening is opened on the outer wall of one side of the chassis 7, and an adjusting screw 32 is screwed on the inner wall of the threaded opening. One end of the adjusting screw 32 is rotatably connected to the limit rack 28. By rotating the adjusting screw 32, the limit rack 28 is driven away from the gear three 27, and then the gear three 27 is driven by the hand wheel 8 to drive the rotating seat 9 to rotate, so as to adjust the angle of the tool 13. After the adjustment is completed, the adjusting screw 32 is rotated in the opposite direction to drive the limit rack 28 and the gear three 27 to engage to ensure the stability of the tool 13.

[0039] Working principle: when in use, when installing the tool 13, install the tool 13 on the tool holder 12, and then install the tool holder 12 on the two rotating seats 9 through the connecting seat 11. When the connecting seat 11 is inserted into the two rotating seats 9 and the connecting seat 11 is inserted into the specified position, the rotating part 15 drives the bidirectional screw 23 to rotate. When the bidirectional screw 23 rotates, it directly drives the two threaded sleeves 25 to move toward or away from each other. When the two threaded sleeves 25 move toward each other, they directly drive the rack 14 and the tooth groove 10 to engage. When the height of the tool 13 needs to be adjusted, first rotate the rotating disk 17. When the rotating disk 17 rotates, it drives the two gears 19 to rotate through the gear 1 18. When the two gears 19 rotate, they directly drive the two screws 20 to rotate synchronously. When the screw 20 rotates, it is convenient to directly drive the drive seat 21 to move. When the drive seat 21 moves, it directly drives the tool 13 to adjust its height. When the angle of the tool 13 needs to be adjusted, first pull the pull rod 29 to drive the limit rack 28 to compress the spring 31 on the telescopic rod 30, thereby directly driving the limit rack 28 away from gear three 27, and then drive gear three 27 to drive the rotating seat 9 to rotate through the hand wheel 8, so as to adjust the angle of the tool 13. After the adjustment is completed, release the pull rod 29, the limit rack 28 and gear three 27 engage, so as to ensure the stability of the tool 13, or rotate the adjusting screw 32 to drive the limit rack 28 away from gear three 27, and then drive gear three 27 to drive the rotating seat 9 to rotate through the hand wheel 8, so as to adjust the angle of the tool 13. After the adjustment is completed, rotate the adjusting screw 32 in the opposite direction to drive the limit rack 28 and gear three 27 to engage, so as to ensure the stability of the tool 13.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A planer tool fixture, comprising a lifting beam (1), characterized in that: A strip groove is formed on one side outer wall of the lifting beam (1), and an electric slide rail is fixedly connected to the inner wall of the strip groove. A tool holder (2) having a T-shaped cross section is slidably connected to the electric slide rail. An adjustment component (3) is installed on one side outer wall of the tool holder (2), and a mounting mechanism (4) is installed at one end of the adjustment component (3). A tool holder mechanism (5) is installed inside the mounting mechanism (4).

2. A planer tool tool according to claim 1, characterized in that: The adjustment assembly (3) comprises an adjustment box (16) fixedly connected to the tool seat (2), and the inner wall of the adjustment box (16) is slidably connected to a driving seat (21) of a T-shaped structure.

3. A planer tool tool according to claim 2, characterized in that: The inner wall of the regulating box (16) is rotatably connected to two screw rods (20), the driving seat (21) is screwed on the outer walls of the two screw rods (20), one end of each of the two screw rods (20) is fixedly connected to a second gear (19), the top inner wall of the regulating box (16) is rotatably connected to a first gear (18), and the first gear (18) and the two second gears (19) are meshed with each other, and the top outer wall of the regulating box (16) is rotatably connected to a rotating disk (17), and one end of a transmission shaft of the rotating disk (17) is fixedly connected to the first gear (18).

4. A planer tool fixture according to claim 3, characterized in that: The mounting mechanism (4) comprises a U-shaped seat (6) fixedly connected to the driving seat (21), and the outer walls on both sides of the U-shaped seat (6) are fixedly connected to the chassis (7), one side outer wall of the chassis (7) is rotatably connected to a hand wheel (8), and the outer wall on the opposite side of the U-shaped seat (6) is rotatably connected to a rotating seat (9), and the rotating seat (9) has a U-shaped cross-section, and one side outer wall of the rotating seat (9) is provided with a tooth groove (10).

5. A planer tool fixture according to claim 4, characterized in that: The tool holder mechanism (5) comprises a connecting seat (11), and the connecting seat (11) is inserted between the two rotating seats (9), one end of the connecting seat (11) is fixedly connected to the tool holder (12), and the inner wall of the tool holder (12) is fixedly connected to the tool (13) by bolts.

6. A planer tool fixture according to claim 5, characterized in that: The connection seat (11) has an installation cavity (22) formed inside, and rectangular openings are formed on the inner walls on both sides of the installation cavity (22). The inner walls of the two rectangular openings are slidably connected to racks (14), and the specifications of the racks (14) match those of the tooth grooves (10).

7. A planer tool fixture according to claim 6, characterized in that: The inner walls on both sides of the installation cavity (22) are rotatably connected to the same bidirectional screw (23), and the outer wall of the bidirectional screw (23) is threadedly connected to two symmetrically arranged threaded sleeves (25), the outer walls of the two threaded sleeves (25) are rotatably connected to two support plates (26), and one end of the four support plates (26) is rotatably connected to two racks (14), respectively; the outer wall of one side of the connecting seat (11) is rotatably connected to a rotating part (15), and one end of the transmission shaft of the rotating part (15) is fixedly connected to the bidirectional screw (23).

8. A planer tool fixture according to claim 7, characterized in that: A gear three (27) is rotatably connected to an inner wall of one side of the chassis (7), and one end of a transmission shaft of the gear three (27) is connected to the rotating seat (9). A limit rack (28) meshing with the gear three (27) is slidably connected to the inner wall of the chassis (7), and one end of a transmission shaft of the hand wheel (8) is fixedly connected to the gear three (27).

9. A planer tool fixture according to claim 8, characterized in that: Two symmetrically arranged telescopic rods (30) are fixedly connected to the inner wall of one side of the chassis (7), and the outer walls of the two telescopic rods (30) are sleeved with springs (31), one end of the two telescopic rods (30) is fixedly connected to the limit rack (28), an opening is opened on the outer wall of one side of the chassis (7), and a pull rod (29) is slidably connected to the inner wall of the opening, and one end of the pull rod (29) is fixedly connected to the limit rack (28).

10. A planer tool fixture according to claim 8, characterized in that: Two symmetrically arranged dampers (33) are fixedly connected to an inner wall of one side of the chassis (7), and one end of the two dampers (33) is fixedly connected to the limit rack (28). A threaded opening is provided on an outer wall of one side of the chassis (7), and an adjusting screw (32) is screwed to the inner wall of the threaded opening. One end of the adjusting screw (32) is rotatably connected to the limit rack (28).

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