One-way material anti-slip device for deep holes

Abstract

The present invention relates to the field of deep hole technology, and proposes a one-way material anti-slip device for deep holes, comprising a protective plate, a notch is provided on the top of the protective plate, and a protective shell is fixedly connected to the bottom of the protective plate; an anti-slip device is provided at the bottom of the protective plate, and the anti-slip device comprises a fixed plate, the top of the fixed plate is fixedly connected to the bottom of the protective plate, the side of the fixed plate is rotatably connected to a rotating rod, the circumferential surface of the rotating rod is fixedly connected to an anti-slip pad, the side of the fixed plate is fixedly connected to a fixed block, the side of the anti-slip pad is provided with a slot, and the circumferential surface of the rotating rod is fixedly connected to a torsion spring. Through the above technical solution, the effect of preventing materials from slipping during transportation in the prior art is solved, but it is difficult to prevent materials from accidentally slipping during transportation or storage, which increases the need for manual intervention and increases time and labor cost issues.

Description

Technical Field

[0001] The invention relates to the technical field of deep holes, and in particular to a one-way material anti-slip device for deep holes. Background Art

[0002] The one-way material anti-slip device for deep holes is a common device in industrial applications. It is designed to prevent materials from accidentally sliding due to gravity or other factors in vertical or inclined deep holes. During material transportation, especially in deep holes or slope transportation, it is very important to prevent materials from sliding.

[0003] According to a disclosed material conveying device for construction engineering (publication number: CN218706118U), it includes a mounting plate, a plurality of support rods are evenly hinged on the bottom, the cross-sectional shapes of the plurality of support rods are all set to an inverted T shape, a plurality of electric telescopic rods are evenly hinged on the bottom of the mounting plate, a bottom plate is commonly arranged at the bottom of the plurality of electric telescopic rods, a groove is opened on the top of the mounting plate, a plurality of first through holes are evenly opened on the top of the mounting plate, a conveying mechanism is arranged inside the groove, and a plurality of collecting mechanisms are evenly arranged on the bottom of the mounting plate. However, in the above-mentioned device, it is difficult to prevent materials from slipping during transportation through the mutual cooperation of components such as support rods, conveying mechanisms and mounting plates, and it is difficult to prevent materials from accidentally slipping during transportation or storage, which increases the demand for manual intervention, time and labor costs, and needs to be improved. Summary of the invention

[0004] The invention provides a one-way material anti-slip device for deep holes.

[0005] The technical solution of the present invention is as follows: a one-way material anti-slip device for deep holes, comprising a protective plate, a notch is provided on the top of the protective plate, and a protective shell is fixedly connected to the bottom of the protective plate;

[0006] An anti-slip device is provided at the bottom of the protective plate, and the anti-slip device includes a fixed plate, the top of the fixed plate is fixedly connected to the bottom of the protective plate, the side of the fixed plate is rotatably connected to a rotating rod, the circumferential surface of the rotating rod is fixedly connected to an anti-slip pad, and the side of the fixed plate is fixedly connected to a fixed block.

[0007] A slot is provided on the side of the anti-slip pad, a torsion spring is fixedly connected to the circumferential surface of the rotating rod, and one end of the torsion spring away from the rotating rod is fixedly connected to the inner wall of the slot.

[0008] The initial state of the torsion spring is a relaxed state, and the number of the fixing plates is set to be a plurality, two by two in a group, and arranged in a circumferential array at the bottom of the protective plate.

[0009] A lubrication device is provided at the bottom of the protective plate, and the lubrication device includes a half gear, and the half gear is fixedly connected to the circumferential surface of the rotating rod. The bottom of the protective plate is slidably connected to a rack, and the inner wall of the protective shell is provided with a spring pump. The side of the rack is fixedly connected to a spring, and the end of the spring away from the rack is fixedly connected to a positioning block, and the top of the positioning block is fixedly connected to the bottom of the protective plate.

[0010] A push rod passes through the top of the spring pump, a partition is fixedly connected to the bottom of the push rod, a positioning plate is fixedly connected to the inner wall of the spring pump, a limiting rod passes through the top of the partition, both ends of the limiting rod are fixedly connected to the inner wall of the spring pump, and an oil outlet pipe is fixedly passed through the side of the spring pump.

[0011] The side of the positioning plate is in contact with the side of the partition, and the bottom of the partition is fixedly connected with a return spring, and the end of the return spring away from the partition is fixedly connected to the inner wall of the spring pump. The force of the anti-skid pad to rotate inward by pressing the anti-skid pad cooperates with the fixed block, torsion spring, card slot and other components in the anti-skid device to achieve the reset of the anti-skid pad by the elastic force of the torsion spring, so that the anti-skid pad can be fixed inside the deep hole to prevent the material from falling down, thereby achieving the effect of preventing the material from slipping during transportation, effectively preventing the material from accidentally slipping during transportation or storage, reducing the need for manual intervention, saving time and labor costs. This design is not only suitable for the stable transportation of materials, but also can be used for the fixation and sealing of special materials, thereby improving the practicability and applicability of the device.

[0012] The bottom of the protective plate is provided with a stirring device, and the stirring device includes a support rod, one end of the support rod is fixedly connected to the circumferential surface of the push rod, and the other end of the support rod is fixedly connected to the rack rod, the inner wall of the protective shell is fixedly connected to the oil tank, the top of the oil tank is fixedly connected to a mounting plate, the side of the mounting plate is rotatably connected to a rotating shaft, the circumferential surface of the rotating shaft is fixedly connected to a gear, the circumferential surface of the rotating shaft is rotatably connected to a belt, the end of the belt away from the rotating shaft is rotatably connected to a rotating rod, one end of the rotating rod is fixedly connected to a helical gear, the top of the oil tank is penetrated by a rotating shaft, the circumferential surface of the rotating shaft is fixedly connected to a bevel gear, and the circumference of the rotating shaft The surface is fixedly connected with a stirring plate, and the bottom of the rotating shaft is fixedly connected with a scraper. The force of the support rod driven downward by the push rod cooperates with the stirring plate, rotating shaft, scraper and other components in the stirring device, so that the stirring plate is driven to rotate by the rotation of the rotating shaft, and the scraper is driven to rotate by the rotation of the rotating shaft, thereby achieving the effect of uniformly stirring the lubricating oil in the oil tank. The scraper can stir the lubricating oil at the bottom of the oil tank to prevent the accumulation of sediment in the lubricating oil, and prevent the sediment or impurities in the oil from concentrating at the bottom of the oil tank, thereby improving the lubrication effect and the service life of the lubricating oil. By keeping the lubricating oil clean and uniform, the device helps to reduce the wear and friction of mechanical parts.

[0013] A rectangular plate is fixedly connected to the top of the oil tank, the side of the rectangular plate is rotatably connected to the circumferential surface of the rotating rod, the side of the rack rod is meshed with the side of the gear, and the side of the half gear with the tooth block is meshed with the side of the rack.

[0014] The side surface of the helical gear meshes with the side surface of the bevel gear. The number of the stirring plates is set to be several and arranged in a circumferential array on the circumferential surface of the rotating shaft. The top of the push rod is set to be an inclined surface.

[0015] The initial state of the spring is a relaxed state, the push rod is located on the motion track of the rack, and the initial state of the reset spring is a relaxed state.

[0016] The working principle and beneficial effects of the present invention are:

[0017] 1. The present invention cooperates with the fixed block, torsion spring, and card slot in the anti-skid device by pressing the anti-skid pad to rotate the force inward, so that the anti-skid pad can be reset by the elastic force of the torsion spring, so that the anti-skid pad can be fixed inside the deep hole to prevent the material from falling down, thereby achieving the effect of preventing the material from slipping during transportation, effectively preventing the material from accidentally slipping during transportation or storage, reducing the need for manual intervention, saving time and labor costs. This design is not only suitable for the stable transportation of materials, but also can be used for the fixation and sealing of special materials, thereby improving the practicality and scope of application of the device.

[0018] 2. The present invention uses the force of the rotating rod driven by the rotation of the anti-skid pad to cooperate with the components such as the spring pump, the return spring and the oil outlet pipe in the lubrication device, so that the lubricating oil in the spring pump flows to the bottom of the spring pump through the gap on the side of the positioning plate, and then drips onto the torsion spring through the oil outlet pipe, thereby achieving the lubrication effect and ensuring that the torsion spring is always in a lubricated state, thereby ensuring the stability and long-term reliability of the device, reducing the frequency and operation of manual lubrication, reducing maintenance costs and working hours, reducing wear and friction, and extending the service life of the device.

[0019] 3. The present invention achieves the effect of uniformly stirring the lubricating oil in the oil tank by driving the force of the support rod to move downward through the downward displacement of the push rod, and cooperating with the stirring plate, rotating shaft, scraper and other components in the stirring device, thereby realizing the effect of driving the stirring plate to rotate through the rotation of the rotating shaft, and driving the scraper to rotate through the rotation of the rotating shaft, thereby achieving the effect of uniformly stirring the lubricating oil at the bottom of the oil tank. The scraper can stir the lubricating oil at the bottom of the oil tank to prevent the accumulation of sediment in the lubricating oil, and prevent the sediment or impurities in the oil from concentrating at the bottom of the oil tank, thereby improving the lubrication effect and the service life of the lubricating oil. By keeping the lubricating oil clean and uniform, the device helps to reduce the wear and friction of mechanical parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present invention;

[0022] Figure 2 It is a three-dimensional side view structural schematic diagram of the torsion spring of the present invention;

[0023] Figure 3 It is a three-dimensional side view structural schematic diagram of the oil tank of the present invention;

[0024] Figure 4 It is a schematic diagram of a three-dimensional half-section structure of the anti-slip pad of the present invention;

[0025] Figure 5 It is a three-dimensional enlarged structural schematic diagram of the rack of the present invention;

[0026] Figure 6 It is a three-dimensional enlarged structural schematic diagram of the push rod of the present invention;

[0027] Figure 7 It is a three-dimensional side view structural schematic diagram of the scraper of the present invention;

[0028] Figure 8 For the present invention Figure 4 Schematic diagram of the three-dimensional enlarged structure of A in the middle.

[0029] In the figure: 101, protective plate; 102, notch; 103, protective shell; 2, anti-skid device; 201, fixed plate; 202, rotating rod; 203, torsion spring; 204, fixed block; 205, anti-skid pad; 206, slot; 3, lubricating device; 301, half gear; 302, positioning block; 303, spring; 304, rack; 305, spring pump; 306, push rod; 307, positioning plate; 308 , partition; 309, limit rod; 310, return spring; 311, oil outlet pipe; 4, stirring device; 401, support rod; 402, rack rod; 403, mounting plate; 404, rotating shaft; 405, gear; 406, belt; 407, rectangular plate; 408, rotating rod; 409, bevel gear; 410, bevel gear; 411, rotating shaft; 412, oil tank; 413, stirring plate; 414, scraper. DETAILED DESCRIPTION

[0030] The following will be combined with 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.

[0031] Example 1

[0032] like Figure 1-2As shown, this embodiment proposes a one-way material anti-slip device for deep holes, including a protective plate 101, a notch 102 is provided on the top of the protective plate 101, and a protective shell 103 is fixedly connected to the bottom of the protective plate 101; an anti-slip device 2 is provided at the bottom of the protective plate 101, and the anti-slip device 2 includes a fixed plate 201, the top of the fixed plate 201 is fixedly connected to the bottom of the protective plate 101, a rotating rod 202 is rotatably connected to the side of the fixed plate 201, an anti-slip pad 205 is fixedly connected to the circumferential surface of the rotating rod 202, and a fixed block 204 is fixedly connected to the side of the fixed plate 201. A slot 206 is provided on the side of the anti-slip pad 205, and a torsion spring 203 is fixedly connected to the circumferential surface of the rotating rod 202, and one end of the torsion spring 203 away from the rotating rod 202 is fixedly connected to the inner wall of the slot 206. The initial state of the torsion spring 203 is a relaxed state, and the number of the fixed plates 201 is set to be several, two by two, and arranged in a circumferential array at the bottom of the protective plate 101. The bottom of the protective plate 101 is provided with a lubricating device 3, which includes a half gear 301, which is fixedly connected to the circumferential surface of the rotating rod 202, and the bottom of the protective plate 101 is slidably connected with a rack 304, and the inner wall of the protective shell 103 is provided with a spring pump 305, and the side of the rack 304 is fixedly connected with a spring 303, and the end of the spring 303 away from the rack 304 is fixedly connected with a positioning block 302, and the top of the positioning block 302 is fixedly connected to the bottom of the protective plate 101. A push rod 306 passes through the top of the spring pump 305, a partition 308 is fixedly connected to the bottom of the push rod 306, a positioning plate 307 is fixedly connected to the inner wall of the spring pump 305, a limiting rod 309 passes through the top of the partition 308, both ends of the limiting rod 309 are fixedly connected to the inner wall of the spring pump 305, and an oil outlet pipe 311 is fixedly passed through the side of the spring pump 305. The side of the positioning plate 307 is in contact with the side of the partition 308, and a return spring 310 is fixedly connected to the bottom of the partition 308. The end of the return spring 310 away from the partition 308 is fixedly connected to the inner wall of the spring pump 305, and the glue can be filled into the deep hole through the notch 102 to further enhance the fixing performance of the anti-slip device. This design is not only suitable for the stable transportation of materials, but also can be used for the fixing and sealing of special materials, which improves the practicality and scope of application of the device. Automatic reset is achieved through the elastic force of the torsion spring 203, which reduces the need for manual intervention and saves time and labor costs. The device uses the displacement of the push rod 306 and the partition 308 to create a gap on the side of the positioning plate 307, so that the lubricating oil in the spring pump 305 can flow to the bottom of the spring pump 305 and drip onto the torsion spring 203 through the oil outlet pipe 311. This design ensures that the torsion spring 203 is always in a lubricated state, thereby ensuring the stability and long-term reliability of the device. It is not only suitable for the stable transportation of materials, but also can be used for the fixing and sealing of special materials, which improves the practicality and scope of application of the device.

[0033] In this embodiment, the protective plate 101 is placed inside the deep hole and the anti-skid pad 205 is pressed inward to rotate the anti-skid pad 205 inward. When the anti-skid pad 205 enters the deep hole, the anti-skid pad 205 is released and the anti-skid pad 205 is reset by the elastic force of the torsion spring 203, so that the anti-skid pad 205 can be fixed inside the deep hole to prevent the material from falling down, thereby achieving the purpose of transporting materials. The protective film on the outside of the material glue can be punctured through the slot 102 to make the glue fill the deep hole. The anti-skid device is fixed inside the deep hole, which effectively prevents the material from accidentally slipping during transportation or storage. In particular, for important or fragile materials, maintaining their stability can avoid damage and waste. The device can ensure that the material remains stable during transportation and avoids shutdowns and additional manpower handling due to slipping.

[0034] In the above-mentioned anti-skid process, the rotation of the anti-skid pad 205 drives the rotating rod 202 to rotate, and then the rotation of the rotating rod 202 drives the half gear 301 to rotate, and the rotation of the half gear 301 drives the rack 304 to move, and then the rack 304 is displaced to squeeze the push rod 306 so that the push rod 306 moves downward, and the push rod 306 moves downward to drive the partition plate 308 to move downward, so that a gap appears on the side of the positioning plate 307, and the lubricating oil in the spring pump 305 flows to the bottom of the spring pump 305 through the gap on the side of the positioning plate 307, and then drips onto the torsion spring 203 through the oil outlet pipe 311, thereby achieving the lubrication effect. The device utilizes the displacement of the push rod 306 and the partition plate 308 to cause a gap to appear on the side of the positioning plate 307, so that the lubricating oil in the spring pump 305 can flow to the bottom of the spring pump 305 and drip onto the torsion spring 203 through the oil outlet pipe 311. This design ensures that the torsion spring 203 is always in a lubricated state, thereby ensuring the stability and long-term reliability of the device.

[0035] Example 2

[0036] like Figure 3 to Figure 8As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment further proposes a one-way material anti-slip device for deep holes, a stirring device 4 is arranged at the bottom of the protective plate 101, the stirring device 4 comprises a support rod 401, one end of the support rod 401 is fixedly connected to the circumferential surface of the push rod 306, the other end of the support rod 401 is fixedly connected to the rack rod 402, the inner wall of the protective shell 103 is fixedly connected to the oil tank 412, the top of the oil tank 412 is fixedly connected to the mounting plate 403, and the side of the mounting plate 403 is rotatably connected to Rotating shaft 404, gear 405 is fixedly connected to the circumferential surface of rotating shaft 404, belt 406 is rotatably connected to the circumferential surface of rotating shaft 404, one end of belt 406 away from rotating shaft 404 is rotatably connected to rotating rod 408, one end of rotating rod 408 is fixedly connected to bevel gear 409, rotating shaft 411 passes through the top of oil tank 412, bevel gear 410 is fixedly connected to the circumferential surface of rotating shaft 411, stirring plate 413 is fixedly connected to the circumferential surface of rotating shaft 411, and scraper 414 is fixedly connected to the bottom of rotating shaft 411. Rectangular plate 407 is fixedly connected to the top of oil tank 412, the side of rectangular plate 407 is rotatably connected to the circumferential surface of rotating rod 408, the side of rack rod 402 is meshed with the side of gear 405, and the side of half gear 301 with tooth block is meshed with the side of rack 304. The side surface of the helical gear 409 meshes with the side surface of the bevel gear 410 . The number of the stirring plates 413 is set to be a plurality and arranged in a circumferential array on the circumferential surface of the rotating shaft 411 . The top of the push rod 306 is set to be an inclined surface. The initial state of the spring 303 is a relaxed state, the push rod 306 is located on the motion trajectory of the rack 304, the initial state of the reset spring 310 is a relaxed state, and the scraper 414 can stir the lubricating oil at the bottom of the oil tank 412 to prevent the accumulation of sediment in the lubricating oil. The device effectively stirs the lubricating oil in the oil tank 412 evenly through the rotation of the scraper 414 and the stirring plate 413. This uniformity ensures the consistency of the lubricating oil during use and prevents the sediment or impurities in the oil from concentrating at the bottom of the oil tank 412, thereby improving the lubrication effect and the service life of the lubricating oil, extending the service life of the equipment, and improving the reliability and stability of the equipment. The design of the scraper 414 prevents the sediment from accumulating at the bottom of the oil tank 412 for a long time, which is crucial to the quality and stability of the lubricating oil, because the sediment will affect the fluidity and lubrication performance of the lubricating oil, and may even cause damage to mechanical parts. It can ensure the smooth operation and durability of the mechanical transmission parts, thereby increasing the service life of the device.

[0037] In this embodiment, the push rod 306 is moved downward to drive the support rod 401 to move downward, and the support rod 401 is moved downward to drive the rack rod 402 to move downward, and the rack rod 402 is moved to rotate the gear 405, and the rotation of the gear 405 drives the rotating shaft 404 to rotate, and the rotation of the rotating shaft 404 drives the bevel gear 409 to rotate, and the rotation of the bevel gear 409 drives the bevel gear 410 to rotate, and the rotation of the bevel gear 410 drives the rotating shaft 411 to rotate, and the rotation of the rotating shaft 411 drives the stirring plate 413 to rotate, and the rotation of the rotating shaft 411 drives the stirring plate 413 to rotate. The movable scraper 414 rotates to achieve the effect of evenly stirring the lubricating oil in the oil tank 412. The scraper 414 can stir the lubricating oil at the bottom of the oil tank 412 to prevent the accumulation of sediment in the lubricating oil. The device effectively stirs the lubricating oil in the oil tank 412 evenly through the rotation of the scraper 414 and the stirring plate 413. This uniformity ensures the consistency of the lubricating oil during use and prevents sediment or impurities in the oil from concentrating at the bottom of the oil tank 412, thereby improving the lubrication effect and the service life of the lubricating oil, extending the service life of the equipment, improving the reliability and stability of the equipment, and improving work efficiency.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A one-way material anti-slip device for deep holes, characterized in that: It comprises a protective plate (101), the top of the protective plate (101) is provided with a notch (102), and the bottom of the protective plate (101) is fixedly connected to a protective shell (103); The bottom of the protective plate (101) is provided with an anti-skid device (2), the anti-skid device (2) comprises a fixed plate (201), the top of the fixed plate (201) is fixedly connected to the bottom of the protective plate (101), the side of the fixed plate (201) is rotatably connected to a rotating rod (202), the circumferential surface of the rotating rod (202) is fixedly connected to an anti-skid pad (205), and the side of the fixed plate (201) is fixedly connected to a fixed block (204); A lubricating device (3) is provided at the bottom of the protective plate (101), the lubricating device (3) comprising a half gear (301), the half gear (301) being fixedly connected to the circumferential surface of the rotating rod (202), a rack (304) being slidably connected to the bottom of the protective plate (101), a spring pump (305) being provided on the inner wall of the protective shell (103), a spring (303) being fixedly connected to the side of the rack (304), a positioning block (302) being fixedly connected to one end of the spring (303) away from the rack (304), the top of the positioning block (302) being fixedly connected to the bottom of the protective plate (101), and a push rod (305) passing through the top of the spring pump (305). 306), a partition (308) is fixedly connected to the bottom of the push rod (306), a positioning plate (307) is fixedly connected to the inner wall of the spring pump (305), a limiting rod (309) passes through the top of the partition (308), both ends of the limiting rod (309) are fixedly connected to the inner wall of the spring pump (305), an oil outlet pipe (311) is fixedly passed through the side of the spring pump (305), the side of the positioning plate (307) is in contact with the side of the partition (308), a return spring (310) is fixedly connected to the bottom of the partition (308), and one end of the return spring (310) away from the partition (308) is fixedly connected to the inner wall of the spring pump (305); A stirring device (4) is provided at the bottom of the protective plate (101), and the stirring device (4) comprises a support rod (401), one end of the support rod (401) is fixedly connected to the circumferential surface of the push rod (306), the other end of the support rod (401) is fixedly connected to a rack rod (402), the inner wall of the protective shell (103) is fixedly connected to an oil tank (412), the top of the oil tank (412) is fixedly connected to a mounting plate (403), the side of the mounting plate (403) is rotatably connected to a rotating shaft (404), the circumferential surface of the rotating shaft (404) is fixedly connected to a gear (405), the circumferential surface of the rotating shaft (404) is rotatably connected to a belt (406), and the belt (406) is fixedly connected to the circumferential surface of the rotating shaft (404). 6) A rotating rod (408) is rotatably connected to one end away from the rotating shaft (404), and a bevel gear (409) is fixedly connected to one end of the rotating rod (408). A rotating shaft (411) passes through the top of the oil tank (412), and a bevel gear (410) is fixedly connected to the circumferential surface of the rotating shaft (411). A stirring plate (413) is fixedly connected to the circumferential surface of the rotating shaft (411), and a scraper (414) is fixedly connected to the bottom of the rotating shaft (411). The side surface of the bevel gear (409) is meshed with the side surface of the bevel gear (410). The number of the stirring plates (413) is set to be a plurality and arranged in a circumferential array on the circumferential surface of the rotating shaft (411). The top of the push rod (306) is set to be an inclined surface.

2. The one-way material anti-slip device for deep holes according to claim 1, characterized in that: A slot (206) is provided on the side of the anti-slip pad (205), a torsion spring (203) is fixedly connected to the circumferential surface of the rotating rod (202), and one end of the torsion spring (203) away from the rotating rod (202) is fixedly connected to the inner wall of the slot (206).

3. The one-way material anti-slip device for deep holes according to claim 2, characterized in that: The initial state of the torsion spring (203) is a relaxed state, and the number of the fixing plates (201) is set to be a plurality, in groups of two, and arranged in a circumferential array at the bottom of the protective plate (101).

4. The one-way material anti-slip device for deep holes according to claim 3, characterized in that: A rectangular plate (407) is fixedly connected to the top of the oil tank (412); the side of the rectangular plate (407) is rotatably connected to the circumferential surface of the rotating rod (408); the side of the rack rod (402) is meshed with the side of the gear (405); and the side of the half gear (301) having the tooth block is meshed with the side of the rack (304).

5. The one-way material anti-slip device for deep holes according to claim 4, characterized in that: The initial state of the spring (303) is a relaxed state, the push rod (306) is located on the movement track of the rack (304), and the initial state of the return spring (310) is a relaxed state.

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