Safety protection device of plate shearing machine

Abstract

The invention relates to the technical field of plate shearing machines, in particular to a plate shearing machine safety protection device which comprises a plate shearing machine body, a protection mechanism is arranged on the outer wall of one side of the plate shearing machine body and comprises a U-shaped seat, the U-shaped seat is fixedly connected to the outer wall of the plate shearing machine body, and a guardrail is fixedly connected to the outer wall of the top of the U-shaped seat. The two ends of the guardrail are fixedly connected to the machine body, openings are formed in the outer walls of the two sides of the guardrail correspondingly, and a first protection assembly and a second protection assembly are arranged on the inner walls of the two openings correspondingly. The protection mechanism is arranged on the plate shearing machine body, and the U-shaped seat and the guardrail in the protection mechanism are matched, so that the blanking area of the plate shearing machine is conveniently protected and blocked, workers are prevented from taking materials in the blanking area when the plate shearing machine works, the safety performance of the plate shearing machine is improved, the safety accident rate of the plate shearing machine is reduced, and the safety of the plate shearing machine is improved. And the two protection assemblies are arranged on the guardrail, and the protection assemblies can be opened conveniently after the plate shearing machine completes discharging, so that workers enter the plate shearing machine to take materials.

Description

Technical Field

[0001] The invention relates to the technical field of plate shearing machines, in particular to a safety protection device for plate shearing machines. Background Art

[0002] Shearing machine is a machine that shears plates by reciprocating linear motion of one blade relative to another blade. It applies shear force to metal plates of various thicknesses by using a moving upper blade and a fixed lower blade, and adopts a reasonable blade gap, so that the plates are broken and separated according to the required size. Shearing machine is a kind of forging machine, and its main function is metal processing industry. The products are widely used in aviation, light industry, metallurgy, chemical industry, construction, shipbuilding, automobile, electricity, electrical appliances, decoration and other industries to provide special machinery and complete equipment required.

[0003] When the operator is performing shearing operations in front of the shearing machine, there is a safety hazard of objects hitting the material outlet at the rear of the shearing machine; during the use of the shearing machine, there are often multiple people cooperating in the operation; when time is tight and the task is heavy, there may be a phenomenon that someone is operating the shearing in front while someone is taking materials in the back. Taking materials while the shearing machine is working may cause safety accidents. 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 objectives, the present invention provides the following technical solutions: a safety protection device for a shearing machine, comprising a body of the shearing machine, a protection mechanism being arranged on an outer wall on one side of the body, the protection mechanism comprising a U-shaped seat, and the U-shaped seat being fixedly connected to the outer wall of the body, a guardrail being fixedly connected to the outer wall of the top of the U-shaped seat, and both ends of the guardrail being fixedly connected to the body, openings being provided on the outer walls on both sides of the guardrail, and protection components one and two are respectively arranged on the inner walls of the two openings, a control panel being fixedly connected to the outer wall on one side of the body, and the control panel being electrically connected to protection components one and two.

[0006] By adopting the above structure, the unloading area of ​​the shearing machine can be conveniently protected through the setting of the protective mechanism to prevent the staff from entering the unloading area when the shearing machine is working. The setting of the U-shaped seat is convenient for the installation of the guardrail. The two openings on the guardrail are convenient for the staff to enter and exit and the discharge of larger materials. The setting of the control panel is convenient for the electrical control of the protective component one and the protective component two, which is convenient to open when the shearing machine is working to prevent the staff from entering the unloading area.

[0007] In one possible implementation, the protection component includes a protection frame fixedly connected to the inner wall of the opening of the guardrail, and one side outer wall of the protection frame is rotatably connected to a rectangular frame, the inner wall of the rectangular frame is fixedly connected to a plurality of cross bars, and one side outer wall of the rectangular frame is provided with two symmetrically arranged limit grooves.

[0008] With the above structure, the provision of the protection frame facilitates the rotational installation of the rectangular frame, and the provision of the crossbar facilitates the reinforcement of the rectangular frame.

[0009] In a possible implementation, a locking assembly is installed on an outer wall of one side of the protective frame, and the locking assembly includes a locking seat fixedly connected to the outer wall of the protective frame, two mounting rods are fixedly connected to the inner wall of the locking seat, and the outer walls of the two mounting rods are both sleeved with springs.

[0010] With the above structure, the rectangular frame can be conveniently locked on the protective frame through the setting of the locking assembly, and the setting of the two mounting rods can facilitate the installation of the spring.

[0011] In a possible implementation, the outer walls of the two mounting rods are slidably connected to a same sliding seat, and two limit pins are fixedly connected to an outer wall on one side of the sliding seat, and the specifications of the limit pins match those of the limit grooves.

[0012] With the above structure, the two limit pins are driven to move by the sliding seat, and the limit pins are inserted into the limit grooves, so that the rectangular frame can be locked.

[0013] In a possible implementation, an electromagnet is fixedly connected to the inner wall of the locking seat, and two armatures matching the electromagnet are fixedly connected to the outer wall of one side of the sliding seat.

[0014] With the above structure, magnetism is generated by energizing the electromagnet, and when the electromagnet generates magnetism, the two armatures are attracted to move toward the electromagnet, and then the limit pin is pulled through the sliding seat to operate.

[0015] In a possible implementation, the second protection component includes two fixed seats fixedly connected to the U-shaped seat, and the same rotating seat is rotatably connected between the two fixed seats, a strip opening is opened on one side outer wall of the rotating seat, and a plurality of rotating shafts are rotatably connected to the inner wall of the strip opening, and driving components are provided on both side outer walls of the two fixed seats.

[0016] With the above structure, the two fixed seats are arranged to facilitate the rotatable installation of the rotating seat, the rotating shaft is arranged to facilitate the transportation of large-volume materials, and the driving assembly is arranged to facilitate the rotation of the rotating seat.

[0017] In a possible implementation, the outer wall of the rotating seat on one side away from the body is fixedly connected to a support seat, the outer walls on the opposite sides of the two fixed seats are fixedly connected to a limiting assembly, and the outer wall on the top of the rotating seat is provided with two symmetrically arranged arc grooves, and the driving assembly includes a driving box fixedly connected to the fixed seat, the inner walls on both sides of the driving box are rotatably connected to the same gear 1, and one end of the transmission shaft of the gear 1 is fixedly connected to the rotating seat, the inner wall of the driving box is fixedly connected to a servo motor, and the output shaft of the servo motor is fixedly connected to a gear 2, and the gear 2 and the gear 1 are meshed with each other.

[0018] By adopting the above structure, the support seat is set to facilitate supporting one end of the rotating seat. The cooperation between the limit assembly and the arc groove facilitates limiting the rotating seat. The servo motor in the drive box cooperates with the cooperation between gear two and gear one to directly drive the rotating seat to rotate.

[0019] In a possible implementation, the limit assembly includes a limit seat fixedly connected to a fixed seat, and a strip connection port is opened on one side outer wall of the limit seat, and the inner wall of the strip connection port is slidably connected to a limit axis, and the specifications of the limit axis match the specifications of the arc groove.

[0020] With the above structure, the limit axis slidably mounted on the limit seat can be conveniently matched with the arc groove to limit the rotating seat.

[0021] In one possible implementation, the inner wall of the limit seat is slidably connected to a drive seat, and the drive seat is fixedly connected to the limit shaft, the inner wall of the limit seat is fixedly connected to a servo motor, and the output shaft of the servo motor is fixedly connected to a screw, and the drive seat is threaded on the outer wall of the screw.

[0022] With the above structure, the servo motor drives the screw to rotate, and when the screw rotates, the driving seat is driven to rise and fall, and when the driving seat moves, the limit shaft is driven to move.

[0023] In a possible implementation, two symmetrically arranged electric slide rails are fixedly connected to the inner wall of the limit seat, and the two electric slide rails are slidably connected to the same driving seat, which is fixedly connected to the limit shaft.

[0024] With the above structure, the driving seat can be driven to move conveniently by setting the electric slide rail, and the limiting shaft can be directly driven to move when the driving seat is in motion.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a protective mechanism on the shearing machine body. The cooperation between the U-shaped seat and the guardrail in the protective mechanism facilitates the protective enclosure of the unloading area of ​​the shearing machine to prevent workers from taking materials in the unloading area when the shearing machine is working, thereby improving the safety performance of the shearing machine and reducing the safety accident rate of the shearing machine. In addition, two protective components are provided on the guardrail. The protective components can be opened to facilitate the workers to enter and take materials after the unloading of the shearing machine is completed. (2) The present invention provides an openable and closable rectangular frame on the first protective component, which facilitates the entry of workers when the rectangular frame is opened. The locking component is provided on the first protective component, which facilitates the locking and fixing of the rectangular frame. It is convenient to lock the rectangular frame when the shearing machine is working, and release the lock of the rectangular frame when the shearing machine is working, thereby improving the safety performance of the shearing machine. (3) The present invention arranges a second protection component on the protection mechanism. The rotatable rotating seat in the second protection component facilitates opening of the guardrail and passing of some large parts. The rotating shaft on the rotating seat facilitates the transportation of parts. The arrangement of the support seat facilitates the support of the rotating seat. The arrangement of the limit assembly facilitates the auxiliary limit of the rotating seat. The arrangement of the two driving assemblies facilitates the direct driving of the rotating seat to rotate. The guardrail is opened when the rotating seat rotates ninety degrees. 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 structure of the protection mechanism of the present invention; Figure 3 It is a structural schematic diagram of a protection component of the present invention; Figure 4 This is a schematic diagram of the opening structure of the protection component of the present invention; Figure 5 It is a schematic diagram of the structure of the locking assembly of the present invention; Figure 6 It is a schematic cross-sectional structural diagram of the locking assembly of the present invention; Figure 7 It is a structural schematic diagram of the second protection component of the present invention; Figure 8 It is a schematic cross-sectional structural diagram of a driving assembly of the present invention; Fig. 9 This is a schematic cross-sectional structural diagram of a position limiting assembly according to a first embodiment of the present invention; Fig.10 It is a schematic cross-sectional structure diagram of the limiting component of the second embodiment of the present invention.

[0027] In the figure: 1. body; 2. control panel; 3. protection mechanism; 4. U-shaped seat; 5. guardrail; 6. protection component 2; 7. protection component 1; 8. protection frame; 9. rectangular frame; 10. cross bar; 11. locking component; 12. limiting groove; 13. locking seat; 14. limiting pin; 15. mounting rod; 16. spring; 17. sliding seat; 18. armature; 19. electromagnet; 20. fixed seat; 21. driving component; 22. rotating seat; 23. rotating shaft; 24. arc groove; 25. supporting seat; 26. limiting component; 27. driving box; 28. gear 1; 29. ​​servo motor; 30. gear 2; 31. limiting seat; 32. driving seat; 33. limiting shaft; 34. screw; 35. servo motor; 36. electric slide rail. 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 1-9 A safety protection device for a shearing machine comprises a body 1 of the shearing machine, a protective mechanism 3 is arranged on one side outer wall of the body 1, the protective mechanism 3 comprises a U-shaped seat 4, and the U-shaped seat 4 is fixedly connected to the outer wall of the body 1, a guardrail 5 is fixedly connected to the top outer wall of the U-shaped seat 4, and both ends of the guardrail 5 are fixedly connected to the body 1, both sides of the outer wall of the guardrail 5 are opened, and the inner walls of the two openings are respectively provided with a protective component 1 7 and a protective component 2 6, a control panel 2 is fixedly connected to the outer wall of one side of the body 1, and the control panel The plate 2 is electrically connected to the protective component 1 7 and the protective component 2 6. The setting of the protective mechanism 3 facilitates the protection of the unloading area of ​​the shearing machine to prevent the staff from entering the unloading area when the shearing machine is working. The setting of the U-shaped seat 4 facilitates the installation of the guardrail 5. The two openings on the guardrail 5 are convenient for the staff to enter and exit and the discharge of larger volumes of materials. The setting of the control panel 2 facilitates the electrical control of the protective component 1 7 and the protective component 2 6, which is convenient for opening to prevent the staff from entering the unloading area when the shearing machine is working.

[0030] For details, please refer to Figure 3-5The protection component 7 includes a protection frame 8 fixedly connected to the inner wall of the opening of the guardrail 5, and a rectangular frame 9 is rotatably connected to the outer wall of one side of the protection frame 8, and a plurality of cross bars 10 are fixedly connected to the inner wall of the rectangular frame 9. Two symmetrically arranged limit grooves 12 are provided on the outer wall of one side of the rectangular frame 9. The setting of the protection frame 8 facilitates the rotatable installation of the rectangular frame 9, and the setting of the cross bar 10 facilitates the reinforcement of the rectangular frame 9.

[0031] For details, please refer to Figure 5-6 A locking assembly 11 is installed on the outer wall of one side of the protective frame 8, and the locking assembly 11 includes a locking seat 13 fixedly connected to the outer wall of the protective frame 8, and the inner wall of the locking seat 13 is fixedly connected to two mounting rods 15, and the outer walls of the two mounting rods 15 are both sleeved with springs 16. The setting of the locking assembly 11 makes it convenient to lock the rectangular frame 9 on the protective frame 8, and the setting of the two mounting rods 15 makes it convenient to install the spring 16.

[0032] For details, please refer to Figure 5-6 The outer walls of the two mounting rods 15 are slidably connected to the same sliding seat 17, and two limit pins 14 are fixedly connected to the outer wall of one side of the sliding seat 17. The specifications of the limit pins 14 match the specifications of the limit groove 12. The two limit pins 14 are moved by sliding the sliding seat 17. The limit pins 14 are inserted into the limit groove 12 to lock the rectangular frame 9.

[0033] For details, please refer to Figure 6 The inner wall of the locking seat 13 is fixedly connected with an electromagnet 19, and the outer wall of one side of the sliding seat 17 is fixedly connected with two armatures 18 matching the electromagnet 19. When the electromagnet 19 is energized, magnetism is generated. When the electromagnet 19 generates magnetism, the two armatures 18 are attracted to move toward the electromagnet 19, and then the limit pin 14 is pulled through the sliding seat 17 to operate.

[0034] For details, please refer to Figure 7 The protection component 2 6 includes two fixed seats 20 fixedly connected to the U-shaped seat 4, and the same rotating seat 22 is rotatably connected between the two fixed seats 20. A strip-shaped opening is opened on one side outer wall of the rotating seat 22, and a plurality of rotating shafts 23 are rotatably connected to the inner wall of the strip-shaped opening. The outer walls of both sides of the two fixed seats 20 are provided with driving components 21. The setting of the two fixed seats 20 facilitates the rotatable installation of the rotating seat 22. The setting of the rotating shaft 23 facilitates the transportation of large-volume materials. The setting of the driving component 21 facilitates the rotation of the rotating seat 22.

[0035] For details, please refer to Figure 7-9, the outer wall of the rotating seat 22 away from the body 1 is fixedly connected with a support seat 25, the outer walls of the opposite sides of the two fixed seats 20 are fixedly connected with a limiting assembly 26, and the outer wall of the top of the rotating seat 22 is provided with two symmetrically arranged arc grooves 24, and the driving assembly 21 includes a driving box 27 fixedly connected to the fixed seat 20, and the inner walls on both sides of the driving box 27 are rotatably connected with the same gear 1 28, and one end of the transmission shaft of the gear 1 28 is fixedly connected to the rotating seat 22, and the inner wall of the driving box 27 is fixedly connected with a servo motor 29, and the output shaft of the servo motor 29 is fixedly connected with a gear 2 30, and the gear 2 30 and the gear 1 28 are meshed with each other. Through the setting of the support seat 25, it is convenient to support one end of the rotating seat 22, and the cooperation between the limiting assembly 26 and the arc groove 24 is convenient to limit the rotating seat 22, and the servo motor 29 in the driving box 27 cooperates with the cooperation between the gear 2 30 and the gear 1 28, so as to directly drive the rotating seat 22 to rotate.

[0036] For details, please refer to Fig. 9 The limit assembly 26 includes a limit seat 31 fixedly connected to the fixed seat 20, and a strip connection port is opened on the outer wall of one side of the limit seat 31, and the inner wall of the strip connection port is slidably connected to a limit shaft 33, and the specifications of the limit shaft 33 match the specifications of the arc groove 24. The limit shaft 33 is slidably installed on the limit seat 31 to cooperate with the arc groove 24 to limit the rotating seat 22.

[0037] For details, please refer to Fig. 9 The inner wall of the limit seat 31 is slidably connected with a driving seat 32, and the driving seat 32 is fixedly connected to the limit shaft 33. The inner wall of the limit seat 31 is fixedly connected with a servo motor 35, and the output shaft of the servo motor 35 is fixedly connected with a screw 34. The driving seat 32 is screwed on the outer wall of the screw 34. The screw 34 is driven to rotate by the servo motor 35. When the screw 34 rotates, the driving seat 32 is driven to rise and fall. When the driving seat 32 moves, it drives the limit shaft 33 to move.

[0038] Embodiment 2 Based on Example 1, this example introduces a specific structure of a limit assembly 26 in a shearing machine safety protection device. Fig.10 As shown, the inner wall of the limit seat 31 is fixedly connected to two symmetrically arranged electric slide rails 36, and the same driving seat 32 is slidably connected to the two electric slide rails 36. The driving seat 32 is fixedly connected to the limit shaft 33. The setting of the electric slide rails 36 facilitates the driving seat 32 to move. When the driving seat 32 moves, it directly drives the limit shaft 33 to move.

[0039] Working principle: When in use, when the shearing machine is working, the locking assembly 11 and the limiting assembly 26 on the protection assembly 1 7 and the protection assembly 2 6 respectively lock the rectangular frame 9 and the rotating seat 22. When the shearing machine completes the work, the control panel 2 controls the electromagnet 19 in the locking assembly 11 to be energized. When the electromagnet 19 is energized, magnetism is generated, thereby attracting the two armatures 18 to move toward the electromagnet 19. When the armature 18 moves, it directly drives the two limiting pins 14 on the sliding seat 17 to be collected into the locking seat 13. When the sliding seat 17 slides on the mounting rod 15, the spring 16 is compressed. When the limiting pin 14 is away from the limiting groove 12, the rectangular frame 9 can be directly opened. When the rectangular frame 9 is opened, it is convenient for the staff to enter the unloading area to take materials; When a large volume of material appears in the unloading area of ​​the shearing machine, the limiting shaft 33 on the limiting assembly 26 is away from the arc groove 24, and the servo motor 29 in the driving assembly 21 is started. The servo motor 29 starts to drive the gear 2 30 to rotate and drive the gear 1 28 to rotate. When the gear 1 28 rotates, it directly drives the rotating seat 22 to rotate. When the rotating seat 22 rotates ninety degrees, the guardrail is opened to facilitate the discharge of large materials. The rotating shaft 23 on the rotating seat 22 is convenient for conveying large materials. The setting of the support seat 25 is convenient for auxiliary support of the rotating seat 22 to avoid deformation of the rotating seat 22. The servo motor 35 drives the screw 34 to rotate in the limiting assembly 26. When the screw 34 rotates, it directly drives the driving seat 32 to rise and fall. When the driving seat 32 rises and falls, the limiting shaft 33 is driven to insert and move away from the arc groove 24. The rotating seat 22 can be limited by inserting it into the arc groove 24, or the limiting shaft 33 is driven by the electric slide rail 36 to insert and move away from the arc groove 24. The rotating seat 22 can be limited by inserting it into the arc groove 24.

[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 safety protection device for a plate shearing machine, comprising a body (1) of the plate shearing machine, characterized in that: A protective mechanism (3) is provided on an outer wall of one side of the machine body (1), the protective mechanism (3) comprising a U-shaped seat (4), and the U-shaped seat (4) is fixedly connected to the outer wall of the machine body (1), a guardrail (5) is fixedly connected to the outer wall of the top of the U-shaped seat (4), and both ends of the guardrail (5) are fixedly connected to the machine body (1), both outer walls of the guardrail (5) are provided with openings, and the inner walls of the two openings are respectively provided with a protective component one (7) and a protective component two (6), and a control panel (2) is fixedly connected to the outer wall of one side of the machine body (1), and the control panel (2) is electrically connected to the protective component one (7) and the protective component two (6).

2. A shearing machine safety protection device according to claim 1, characterized in that: The protection component 1 (7) comprises a protection frame (8) fixedly connected to the inner wall of the opening of the guardrail (5), and a rectangular frame (9) is rotatably connected to the outer wall of one side of the protection frame (8), a plurality of cross bars (10) are fixedly connected to the inner wall of the rectangular frame (9), and two symmetrically arranged limit grooves (12) are provided on the outer wall of one side of the rectangular frame (9).

3. A shearing machine safety protection device according to claim 2, characterized in that: A locking assembly (11) is installed on an outer wall of one side of the protective frame (8), and the locking assembly (11) includes a locking seat (13) fixedly connected to the outer wall of the protective frame (8), and two mounting rods (15) are fixedly connected to the inner wall of the locking seat (13), and the outer walls of the two mounting rods (15) are both sleeved with springs (16).

4. A shearing machine safety protection device according to claim 3, characterized in that: The outer walls of the two mounting rods (15) are slidably connected to a same sliding seat (17), and one side outer wall of the sliding seat (17) is fixedly connected to two limit pins (14), and the specifications of the limit pins (14) match those of the limit slots (12).

5. A shearing machine safety protection device according to claim 4, characterized in that: An electromagnet (19) is fixedly connected to the inner wall of the locking seat (13), and two armatures (18) matching the electromagnet (19) are fixedly connected to the outer wall of one side of the sliding seat (17).

6. A shearing machine safety protection device according to claim 5, characterized in that: The second protection component (6) comprises two fixed seats (20) fixedly connected to the U-shaped seat (4), and a same rotating seat (22) is rotatably connected between the two fixed seats (20), a strip-shaped opening is provided on one side outer wall of the rotating seat (22), and a plurality of rotating shafts (23) are rotatably connected to the inner wall of the strip-shaped opening, and driving components (21) are provided on both side outer walls of the two fixed seats (20).

7. A shearing machine safety protection device according to claim 6, characterized in that: The outer wall of the rotating seat (22) on one side away from the body (1) is fixedly connected to a support seat (25); the outer walls of the two fixed seats (20) on the opposite side are fixedly connected to a limit assembly (26); the outer wall on the top of the rotating seat (22) is provided with two symmetrically arranged arc grooves (24); the driving assembly (21) comprises a driving box (27) fixedly connected to the fixed seat (20); the inner walls on both sides of the driving box (27) are rotatably connected to the same gear one (28); one end of the transmission shaft of the gear one (28) is fixedly connected to the rotating seat (22); the inner wall of the driving box (27) is fixedly connected to a servo motor (29); the output shaft of the servo motor (29) is fixedly connected to a gear two (30); the gear two (30) and the gear one (28) are meshed with each other.

8. A shearing machine safety protection device according to claim 7, characterized in that: The limit assembly (26) comprises a limit seat (31) fixedly connected to the fixed seat (20), and a strip-shaped connection opening is provided on an outer wall of one side of the limit seat (31), and a limit shaft (33) is slidably connected to the inner wall of the strip-shaped connection opening, and the specifications of the limit shaft (33) match those of the arc groove (24).

9. A shearing machine safety protection device according to claim 8, characterized in that: The inner wall of the limit seat (31) is slidably connected to a driving seat (32), and the driving seat (32) is fixedly connected to the limit shaft (33). The inner wall of the limit seat (31) is fixedly connected to a servo motor (35), and the output shaft of the servo motor (35) is fixedly connected to a screw rod (34), and the driving seat (32) is screwed to the outer wall of the screw rod (34).

10. A shearing machine safety protection device according to claim 8, characterized in that: Two symmetrically arranged electric slide rails (36) are fixedly connected to the inner wall of the limit seat (31), and the two electric slide rails (36) are slidably connected to the same drive seat (32), and the drive seat (32) is fixedly connected to the limit shaft (33).

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