Steel surface inorganic magnesium silicon crystal fireproof air pipe machining and bending device

Abstract

The invention discloses a steel surface inorganic magnesium silicon crystal fireproof air pipe machining and bending device, and relates to the technical field of fireproof air pipe machining, the steel surface inorganic magnesium silicon crystal fireproof air pipe machining and bending device comprises a device body, a bracket is fixedly connected to the top surface of the device body, a pair of adjusting plates is arranged on the bracket, and a storage block is fixedly installed at the top ends of the pair of adjusting plates; an arc-shaped groove is formed in the top surface of the storage block; the pipe fitting bending device further comprises a fastening assembly, an adjusting assembly and a bending assembly, the fastening assembly is arranged on the storage block and used for fixing a pipe fitting, and the adjusting assembly is arranged on the device body and used for controlling the distance between the adjusting plates. The bending assembly is arranged on the device body and used for being matched with the fastening assembly for use. The fireproof air duct machining device is reasonable in structure, a fireproof air duct is fixed through the fastening assembly and the adjusting assembly, then the fireproof air duct is machined through the bending assembly, rapid disassembly and adjustment can be achieved through the fixing mode, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fireproof air duct processing, and in particular to a steel-surface inorganic magnesium silicon crystal fireproof air duct processing and bending device. Background Art

[0002] Fire ducts are a crucial component of a building's fire protection system. Their primary function is to isolate and direct smoke and flames during a fire, ensuring personal safety and minimizing property damage. Fire ducts also contain smoke and flames. The large amounts of smoke and flames generated by a fire can pose a serious threat to personnel, causing dangers such as suffocation. Fire ducts, through ventilation systems and fire doors, can direct smoke and flames to safe areas, minimizing the risk to personnel.

[0003] Existing fireproof air ducts need to be bent according to different usage environments during processing. There are many types of fireproof air ducts, including square fireproof air ducts and round fireproof air ducts. When bending the round fireproof air ducts, most of them are bent through bending rollers and U-shaped bracket structures. This bending method has low processing efficiency and is prone to breakage during bending. Summary of the Invention

[0004] The purpose of this application is to provide a steel-surface inorganic magnesium silicon crystal fire-proof air duct processing and bending device, which realizes the fixation of the fire-proof air duct through fastening components and adjustment components, and then processes the fire-proof air duct through bending components. This fixing method can realize rapid disassembly and adjustment, thereby improving work efficiency.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a steel-surface inorganic magnesium silicon crystal fireproof air duct processing and bending device, comprising a device body, the top surface of the device body is fixedly connected to a bracket, a pair of adjustment plates are provided on the bracket, and a placement block is fixedly installed at the top position of the pair of adjustment plates, and an arc-shaped groove is provided on the top surface of the placement block; it also includes a fastening assembly, an adjustment assembly and a bending assembly, the fastening assembly is arranged on the placement block for fixing the pipe fitting, the adjustment assembly is arranged on the device body for controlling the distance between the adjustment plates, and the bending assembly is arranged on the device body for use in conjunction with the fastening assembly.

[0006] Preferably, the fastening assembly includes a top plate arranged at the top position of the storage block, a pair of brackets are fixedly connected to the two sides of the top plate, one of the brackets is rotatably connected to the side of the storage block, and a plurality of groups of insertion rods are movably inserted at the top surface of the top plate, the top end of the insertion rod is fixedly connected to a ring, a first spring is sleeved on the insertion rod, and the two ends of the first spring are respectively fixedly connected to the bottom surface of the insertion rod and the top surface of the top plate, the bottom end of the insertion rod is fixedly connected to a mounting frame, and a pressure roller is rotatably connected to the mounting frame.

[0007] Preferably, one side of the other bracket is fixedly connected to a cross bar, the side of the storage block is fixedly connected to a pair of limit rods, a sleeve is slidably connected to the pair of limit rods, the sleeve is fixedly connected to the adjustment block, the adjustment block is provided with a slot, the interior of the slot is clamped with the cross bar, one end of the pair of limit rods is fixedly connected to a clamping ring, a second spring is sleeved on the clamping ring, and the two ends of the second spring are respectively fixedly connected to one side of the clamping ring and one side of the sleeve.

[0008] Preferably, the adjustment assembly includes a slide groove opened on the bracket, the interior of the slide groove is slidably connected to a main shaft, the top end of the main shaft is rotatably connected to the bottom surface of the adjustment plate, the bottom end of the main shaft is fixedly connected to a base, the base is slidably connected to the guide rod, and the two ends of the guide rod are fixedly connected to the inner wall of the bracket.

[0009] Preferably, a pair of rotating rods are rotatably connected to the device body, and a pair of the rotating rods are fixedly connected to a gear plate, which are engaged with each other, and the top ends of the pair of rotating rods are fixedly connected to an arm plate, and the other end of the arm plate is provided with a through slot, and the main shaft is slidably connected to the inside of the through slot.

[0010] Preferably, a fixing rod is fixedly connected to the device body, a side plate is rotatably connected to the fixing rod, a plurality of groups of latches are fixedly connected to one side of the side plate, the latches are mounted on the toothed disc, the top end of the fixing rod is fixedly connected to a limiting ring, a third spring is sleeved on the fixing rod, and both ends of the third spring are respectively fixedly connected to the bottom surface of the limiting ring and the top end of the side plate.

[0011] Preferably, the bending assembly includes a pin fixedly installed at a position on one side of the top surface of the adjustment plate, a linkage plate is rotatably connected to the pin, the other end of the linkage plate is rotatably connected to the horizontal plate, a clamping seat is fixedly connected to the middle position of the bottom surface of the horizontal plate, the clamping seat is threadedly connected to the threaded rod, the threaded rod is rotatably connected to the first axle seat, the bottom end of the first axle seat is fixedly connected to the device body, and the other end of the threaded rod is fixedly connected to the handle.

[0012] Preferably, the threaded rod is provided with forward and reverse threads, and a driven seat is threadedly connected to the threaded rod, and the driven seat is fixedly connected to the bottom end of the support plate, and the bottom end of the support plate is slidably connected to the guide rail, and the guide rail is fixedly installed in the middle position of the top surface of the bracket.

[0013] Preferably, one side of the top surface of the support plate is fixedly connected to a second shaft seat, a push rod is movably inserted on the second shaft seat, one end of the push rod is fixedly connected to the L-shaped plate, and a limiting roller is rotatably connected to the L-shaped plate.

[0014] Preferably, the other end of the push rod is fixedly connected to a circular ring, and a fourth spring is sleeved on the push rod. Two ends of the fourth spring are respectively fixedly connected to one side of the second shaft seat and one side of the circular ring.

[0015] In summary, the present invention has the following beneficial effects: When it is necessary to bend the fireproof air duct inside the arc groove, the handle is rotated to drive the threaded rod to rotate. The threaded rod is provided with positive and negative threads. The movement of the threaded rod causes the clamping seat to move. The movement of the clamping seat pulls the adjustment plate to rotate on the slide groove through the linkage plate on the horizontal plate, thereby facilitating the bending of the pipe inside the arc groove. Then the movement of the threaded rod causes the driven seat to move in the opposite direction. The movement of the driven seat causes the limiting roller to fit on the fireproof air duct through the elastic force of the fourth spring to cooperate with the bending work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the device body; Figure 2 It is a schematic diagram of the rear-view stereoscopic structure of the device body; Figure 3 Schematic diagram of the three-dimensional structure of the bracket; Figure 4 This is a schematic diagram of the three-dimensional structure of the bracket when viewed from above; Figure 5 Schematic diagram of the three-dimensional structure of the adjustment plate; Figure 6 Schematic diagram of the three-dimensional structure of the arm plate; Figure 7 Schematic diagram of the three-dimensional structure of the horizontal plate; Figure 8 for Figure 5 Enlarged structural diagram at point A in the middle.

[0018] In the figure: 1. Device body; 101. Bracket; 102. Adjustment plate; 103. Storage block; 104. Arc groove; 2. Top plate; 201. Bracket; 202. Insertion rod; 203. Ring; 204. First spring; 205. Mounting frame; 206. Press roller; 207. Cross bar; 208. Limit rod; 209. Sleeve; 210. Adjustment block; 211. Slot; 212. Ring; 213. Second spring; 3. Slide; 301. Spindle; 302. Base; 303. Guide rod; 304. Rotating rod; 3 05. Sprocket; 306. Arm plate; 307. Through slot; 308. Fixed rod; 309. Side plate; 310. Clamping teeth; 311. Limiting ring; 312. Third spring; 4. Pin; 401. Linkage plate; 402. Horizontal plate; 403. Clamping seat; 404. Threaded rod; 405. First shaft seat; 406. Turning handle; 407. Driven seat; 408. Support plate; 409. Guide rail; 410. Second shaft seat; 411. Push rod; 412. L-shaped plate; 413. Limiting roller; 414. Ring; 415. Fourth spring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] Example: Reference Figure 1 - Figure 8 The device shown is a steel-surface inorganic magnesium silicon crystal fireproof air duct processing and bending device, which includes a device body 1, a bracket 101 is fixedly connected to the top surface of the device body 1, a pair of adjustment plates 102 are provided on the bracket 101, and a storage block 103 is fixedly installed at the top position of the pair of adjustment plates 102, and an arc groove 104 is provided on the top surface of the storage block 103; it also includes a fastening component, an adjustment component and a bending component, the fastening component is arranged on the storage block 103 for fixing the pipe fitting, the adjustment component is arranged on the device body 1 for controlling the distance between the adjustment plates 102, and the bending component is arranged on the device body 1 for use in conjunction with the fastening component.

[0021] As an implementation method in this embodiment, the fastening assembly includes a top plate 2 arranged at the top position of the storage block 103, and a pair of brackets 201 are fixedly connected to the two sides of the top plate 2, one of the brackets 201 is rotatably connected to the side of the storage block 103, and a plurality of groups of insertion rods 202 are movably inserted at the top surface of the top plate 2, and the top of the insertion rod 202 is fixedly connected with a ring 203, and a first spring 204 is sleeved on the insertion rod 202, and the two ends of the first spring 204 are respectively fixedly connected to the bottom surface of the insertion rod 202 and the top surface of the top plate 2, and the bottom end of the insertion rod 202 is fixedly connected to the mounting bracket 205, and the mounting bracket 205 is fixedly connected to the bottom surface of the insertion rod 202. A pressure roller 206 is rotatably connected, wherein one side of the other bracket 201 is fixedly connected to a cross bar 207, and a pair of limiting rods 208 are fixedly connected to the side of the storage block 103, and a sleeve 209 is slidably connected to the pair of limiting rods 208, and the sleeve 209 is fixedly connected to the adjustment block 210. A slot 211 is provided on the adjustment block 210, and a cross bar 207 is clamped inside the slot 211. One end of the pair of limiting rods 208 is fixedly connected to a snap ring 212, and a second spring 213 is sleeved on the snap ring 212. The two ends of the second spring 213 are respectively fixedly connected to one side of the snap ring 212 and one side of the sleeve 209.

[0022] Specifically, when the circular fireproof air duct needs to be fixed, an arc-shaped groove 104 is opened at the top position of the storage block 103, the fireproof air duct is placed inside the arc-shaped groove 104, and then the top plate 2 is rotated to the top position of the fireproof air duct. The elastic force of the first spring 204 makes the pressure roller 206 on the mounting frame 205 tightly fit the surface position of the fireproof air duct, and the cross bar 207 is squeezed by the rotation of the top plate 2, so that the cross bar 207 is clamped inside the clamping groove 211 by the elastic force of the second spring 213, thereby facilitating the fixing of the position of the top plate 2.

[0023] As an implementation method in this embodiment, the adjustment component includes a slide groove 3 opened on the bracket 101, the interior of the slide groove 3 is slidably connected to the main shaft 301, the top of the main shaft 301 is rotatably connected to the bottom surface of the adjustment plate 102, the bottom end of the main shaft 301 is fixedly connected to the base 302, the base 302 is slidably connected to the guide rod 303, the two ends of the guide rod 303 are fixedly connected to the inner wall of the bracket 101, and a pair of rotating rods 304 are rotatably connected to the device body 1, and a pair of rotating rods 304 are fixedly connected to the gear discs 305, the gear discs 305 are meshed with each other, and the top ends of the pair of rotating rods 304 are fixedly connected to the main body 1. An arm plate 306 is fixedly connected, and a through slot 307 is provided at the other end of the arm plate 306. The main shaft 301 is slidably connected inside the through slot 307. A fixing rod 308 is fixedly connected to the device body 1, and a side plate 309 is rotatably connected to the fixing rod 308. One side of the side plate 309 is fixedly connected to a plurality of groups of latch teeth 310, and the latch teeth 310 are clamped on the gear disc 305. The top end of the fixing rod 308 is fixedly connected to a limiting ring 311, and a third spring 312 is sleeved on the fixing rod 308. The two ends of the third spring 312 are fixedly connected to the bottom surface of the limiting ring 311 and the top end of the side plate 309 respectively.

[0024] Specifically, when the distance between the adjustment plates 102 needs to be adjusted, the side plate 309 is first rotated, and the locking teeth 310 are disengaged from the toothed disc 305 by the rotation of the side plate 309, and then the arm plate 306 is rotated. The rotation of the arm plate 306 facilitates the rotation of the arm plate 306 on the other end of the rotating rod 304 through the toothed disc 305. A through groove 307 is provided on the arm plate 306, and the rotation of the arm plate 306 makes the slide 3 slide inside the through groove 307, thereby facilitating the movement of the slide 3. The top end of the slide 3 is rotatably connected to the adjustment plate 102, and the movement of the slide 3 facilitates the adjustment of the distance between the adjustment plates 102, which is suitable for bending pipes with different curvatures.

[0025] As an implementation method in this embodiment, the bending assembly includes a pin 4 fixedly installed on one side of the top surface of the adjustment plate 102, the pin 4 is rotatably connected to a linkage plate 401, the other end of the linkage plate 401 is rotatably connected to the horizontal plate 402, and a clamping seat 403 is fixedly connected to the middle position of the bottom surface of the horizontal plate 402, the clamping seat 403 is threadedly connected to the threaded rod 404, the threaded rod 404 is rotatably connected to the first shaft seat 405, the bottom end of the first shaft seat 405 is fixedly connected to the device body 1, the other end of the threaded rod 404 is fixedly connected to a turning handle 406, the threaded rod 404 is provided with positive and negative threads, and the threaded rod 404 is threadedly connected to a driven seat 407, The movable seat 407 is fixedly connected to the bottom end of the support plate 408, and the bottom end of the support plate 408 is slidably connected to the guide rail 409. The guide rail 409 is fixedly installed in the middle position of the top surface of the bracket 101. One side of the top surface of the support plate 408 is fixedly connected to the second shaft seat 410, and a push rod 411 is movably inserted on the second shaft seat 410. One end of the push rod 411 is fixedly connected to the L-shaped plate 412, and the L-shaped plate 412 is rotatably connected to the limiting roller 413. The other end of the push rod 411 is fixedly connected to the ring 414, and a fourth spring 415 is sleeved on the push rod 411. The two ends of the fourth spring 415 are respectively fixedly connected to one side of the second shaft seat 410 and one side of the ring 414.

[0026] Specifically, when it is necessary to bend the fireproof air duct inside the arc groove 104, the handle 406 is rotated to drive the threaded rod 404 to rotate. The threaded rod 404 is provided with positive and negative threads. The movement of the threaded rod 404 causes the clamping seat 403 to move. The movement of the clamping seat 403 pulls the adjustment plate 102 to rotate on the slide groove 3 through the linkage plate 401 on the horizontal plate 402, thereby facilitating the bending of the pipe inside the arc groove 104. Then the movement of the threaded rod 404 causes the driven seat 407 to move in the opposite direction. The movement of the driven seat 407 causes the limiting roller 413 to fit on the fireproof air duct through the elastic force of the fourth spring 415 to cooperate with the bending work.

[0027] Working principle of the present invention: When it is necessary to fix the circular fireproof air duct, an arc-shaped groove 104 is opened at the top position of the storage block 103, and the fireproof air duct is placed inside the arc-shaped groove 104. Then, the top plate 2 is rotated to the top position of the fireproof air duct. The elastic force of the first spring 204 causes the pressure roller 206 on the mounting frame 205 to fit tightly against the surface position of the fireproof air duct. The rotation of the top plate 2 causes the cross bar 207 to be squeezed, so that the elastic force of the second spring 213 causes the cross bar 207 to be clamped inside the clamping groove 211, thereby facilitating the fixing of the position of the top plate 2. When the distance between the adjustment plates 102 needs to be adjusted, the side plate 309 is first rotated, and the locking teeth 310 are disengaged from the toothed disc 305 by the rotation of the side plate 309. Then the arm plate 306 is rotated. The rotation of the arm plate 306 facilitates the rotation of the arm plate 306 on the other end of the rotating rod 304 through the toothed disc 305. A through slot 307 is provided on the arm plate 306. The rotation of the arm plate 306 causes the slide 3 to slide inside the through slot 307, thereby facilitating the movement of the slide 3. The top end of the slide 3 is rotatably connected to the adjustment plate 102. The movement of the slide 3 facilitates the adjustment of the distance between the adjustment plates 102, which is suitable for bending pipes with different curvatures. When it is necessary to bend the fireproof air duct inside the arc groove 104, the handle 406 is rotated to drive the threaded rod 404 to rotate. The threaded rod 404 is provided with positive and negative threads. The movement of the threaded rod 404 causes the clamping seat 403 to move. The movement of the clamping seat 403 pulls the adjustment plate 102 to rotate on the slide groove 3 through the linkage plate 401 on the horizontal plate 402, thereby facilitating the bending of the pipe inside the arc groove 104. Then the movement of the threaded rod 404 causes the driven seat 407 to move in the opposite direction. The movement of the driven seat 407 causes the limiting roller 413 to fit on the fireproof air duct through the elastic force of the fourth spring 415 to cooperate with the bending work.

[0028] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been 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 make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steel surface inorganic magnesium silicon crystal fireproof air duct processing and bending device, characterized in that: include: A device body (1), wherein a bracket (101) is fixedly connected to the top surface of the device body (1), a pair of adjustment plates (102) are provided on the bracket (101), a storage block (103) is fixedly installed at the top of the pair of adjustment plates (102), and an arc-shaped groove (104) is provided on the top surface of the storage block (103); It also includes a fastening assembly, an adjusting assembly, and a bending assembly. The fastening assembly is arranged on the placement block (103) for fixing the pipe fittings. The adjusting assembly is arranged on the device body (1) for controlling the distance between the adjusting plates (102). The bending assembly is arranged on the device body (1) for use in conjunction with the fastening assembly.

2. The steel-surface inorganic magnesium-based silicon crystal fireproof air duct processing and bending device according to claim 1 is characterized in that: The fastening assembly comprises a top plate (2) arranged at the top position of the storage block (103), a pair of brackets (201) are fixedly connected to the two sides of the top plate (2), one of the brackets (201) is rotatably connected to the side of the storage block (103), a plurality of groups of insertion rods (202) are movably inserted at the top surface of the top plate (2), the top ends of the insertion rods (202) are fixedly connected to the collars (203), a first spring (204) is sleeved on the insertion rods (202), the two ends of the first spring (204) are fixedly connected to the bottom surface of the insertion rods (202) and the top surface of the top plate (2), respectively, the bottom end of the insertion rods (202) is fixedly connected to the mounting frame (205), and the mounting frame (205) is rotatably connected to a pressure roller (206).

3. The steel-surface inorganic magnesium-based silicon crystal fireproof air duct processing and bending device according to claim 2, characterized in that: One side of the other bracket (201) is fixedly connected to a cross bar (207), and the side of the storage block (103) is fixedly connected to a pair of limiting rods (208), and a sleeve (209) is slidably connected to the pair of limiting rods (208), and the sleeve (209) is fixedly connected to the adjustment block (210). The adjustment block (210) is provided with a slot (211), and the interior of the slot (211) is provided with the cross bar (207), and one end of the pair of limiting rods (208) is fixedly connected to a snap ring (212), and a second spring (213) is sleeved on the snap ring (212), and the two ends of the second spring (213) are fixedly connected to one side of the snap ring (212) and one side of the sleeve (209), respectively.

4. The steel-surface inorganic magnesium-based silicon crystal fireproof air duct processing and bending device according to claim 3, characterized in that: The adjustment assembly includes a slide groove (3) provided on the bracket (101), a main shaft (301) is slidably connected inside the slide groove (3), the top end of the main shaft (301) is rotatably connected to the bottom surface of the adjustment plate (102), the bottom end of the main shaft (301) is fixedly connected to a base (302), the base (302) is slidably connected to a guide rod (303), and both ends of the guide rod (303) are fixedly connected to the inner wall of the bracket (101).

5. The steel-surface inorganic magnesium-based silicon crystal fireproof air duct processing and bending device according to claim 4, characterized in that: A pair of rotating rods (304) are rotatably connected to the device body (1), and a toothed disc (305) is fixedly connected to the pair of rotating rods (304). The toothed discs (305) are meshed with each other. An arm plate (306) is fixedly connected to the top end of the pair of rotating rods (304), and a through slot (307) is provided at the other end of the arm plate (306). The main shaft (301) is slidably connected inside the through slot (307).

6. The device for processing and bending steel-surface inorganic magnesium-based silicon crystal fireproof air duct according to claim 5, characterized in that: The device body (1) is fixedly connected to a fixing rod (308), and the fixing rod (308) is rotatably connected to a side plate (309). One side of the side plate (309) is fixedly connected to a plurality of groups of latching teeth (310), and the latching teeth (310) are clamped on the toothed disc (305). The top end of the fixing rod (308) is fixedly connected to a limiting ring (311), and a third spring (312) is sleeved on the fixing rod (308). The two ends of the third spring (312) are respectively fixedly connected to the bottom surface of the limiting ring (311) and the top end of the side plate (309).

7. The device for processing and bending steel-surface inorganic magnesium-based silicon crystal fireproof air duct according to claim 2, characterized in that: The bending assembly comprises a pin (4) fixedly mounted on one side of the top surface of the adjustment plate (102); a linkage plate (401) is rotatably connected to the pin (4); the other end of the linkage plate (401) is rotatably connected to the transverse plate (402); a clamping seat (403) is fixedly connected to the middle position of the bottom surface of the transverse plate (402); the clamping seat (403) is threadedly connected to a threaded rod (404); the threaded rod (404) is rotatably connected to a first shaft seat (405); the bottom end of the first shaft seat (405) is fixedly connected to the device body (1); and the other end of the threaded rod (404) is fixedly connected to a turning handle (406).

8. The device for processing and bending steel-surface inorganic magnesium-based silicon crystal fireproof air duct according to claim 7, characterized in that: The threaded rod (404) is provided with forward and reverse threads, and a driven seat (407) is threadedly connected to the threaded rod (404). The driven seat (407) is fixedly connected to the bottom end of the support plate (408). The bottom end of the support plate (408) is slidably connected to the guide rail (409), and the guide rail (409) is fixedly installed at the middle position of the top surface of the bracket (101).

9. The steel-surface inorganic magnesium-based silicon crystal fireproof air duct processing and bending device according to claim 8, characterized in that: A second shaft seat (410) is fixedly connected to one side of the top surface of the support plate (408), a push rod (411) is movably inserted into the second shaft seat (410), one end of the push rod (411) is fixedly connected to the L-shaped plate (412), and a limiting roller (413) is rotatably connected to the L-shaped plate (412).

10. The steel-surface inorganic magnesium-based silicon crystal fireproof air duct processing and bending device according to claim 9, characterized in that: The other end of the push rod (411) is fixedly connected to a circular ring (414), and a fourth spring (415) is sleeved on the push rod (411). The two ends of the fourth spring (415) are respectively fixedly connected to one side of the second shaft seat (410) and one side of the circular ring (414).

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