Detachable screw rod type hoist screw rod protection device

Abstract

The invention provides a detachable screw protection device for a screw hoist. The detachable screw protection device comprises a small potentiostat and a protection assembly, the protection assembly is arranged at the top of the screw hoist and comprises a protection cover, a fixed anode and a cathode electric brush, the fixed anode and the cathode electric brush are both arranged outside a screw and matched with each other to form cathode protection on the screw, the fixed anode is connected with an anode of the small potentiostat through a cable, and the cathode electric brush is connected with the cathode of the small potentiostat through a cable. And the cathode brush is connected with the cathode of the small-sized potentiostat. By arranging the insulating sleeve, the protective cover, the cathode electric brush, the fixed anode, the small-sized potentiostat and other components, the protective cover can simply protect the screw rod, and meanwhile, the cathode electric brush, the fixed anode and the small-sized potentiostat are matched with one another to form cathode protection current to protect the screw rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoist, in particular to a detachable screw rod protection device for screw rod hoist. BACKGROUND

[0002] As the core mechanical equipment for controlling the opening and closing of the gate (or valve), the hoist plays an irreplaceable role in the scenes of water conservancy projects (reservoirs, sluices, hydropower stations), municipal water supply and drainage, sewage treatment plants, etc. Its main functions are to regulate water flow, control water level, prevent floods and drain water, and ensure the continuity and safety of power generation and water supply.

[0003] Screw rod hoist is a widely used type in the hoist family. It takes screw-nut pair as the core transmission mechanism. The rotation of the screw rod drives the nut (fixedly connected with the gate) to move linearly, thereby realizing the lifting operation of the gate. This type of hoist is widely used in small and medium tonnage, short stroke water gate control scenes due to its simple structure, convenient operation and low manufacturing cost.

[0004] However, the existing screw rod hoist has significant technical defects in actual application. Due to its working characteristics, the screw rod needs to be partially or completely exposed to the external environment. Since the working scene of the hoist is mostly related to water conservancy areas, the environment is humid, and the screw rod will inevitably come into direct contact with river water, rainwater, water vapor in the air, and sand, corrosive media (such as chemicals in sewage, salt in water, etc.). In such harsh environments for a long time, the surface of the screw rod is prone to oxidation and rust, which reduces the fitting accuracy of the screw rod and the nut, increases the transmission resistance, and in severe cases, causes the screw rod to be stuck, affecting the normal operation of the hoist, and even causing safety hazards such as the gate not being able to be opened and closed in time. At the same time, rust will weaken the structural strength of the screw rod, shorten its service life, and increase the equipment maintenance cost and replacement frequency.

[0005] Currently, the protection measures for the screw rod in the industry are mostly to apply anti-rust paint or use a simple sleeve type protective cover. Although the anti-rust paint method has a lower cost, the anti-rust effect is limited, and the paint layer is easily worn off during repeated movement of the screw rod, requiring frequent reapplication and a large amount of maintenance work. The simple sleeve type protective cover can only shield sand and reduce direct rainwater erosion, but it cannot isolate water vapor in the air and cannot fundamentally solve the corrosion problem. Moreover, the protective cover is mostly of an integral structure, which is inconvenient to install and remove, and is not convenient for maintenance and repair of the screw rod and the top components of the hoist. Therefore, a detachable screw rod protection device for screw rod hoist is proposed to solve the above problems. SUMMARY

[0006] The main purpose of the present application is to provide a detachable screw rod protection device for screw rod hoist, which solves the problem of poor protection effect of the screw rod in the prior art.

[0007] To solve the above technical problems, the technical scheme adopted by the present application is: a detachable screw type gate hoist screw protection device, comprising a small constant potential instrument and a protection assembly; The protection assembly is arranged on the top of the screw gate hoist, and comprises a protection cover, a fixed anode and a cathode brush, the fixed anode and the cathode brush are arranged outside the screw, and can form cathodic protection for the screw in cooperation, the fixed anode is connected with the anode of the small constant potential instrument through a cable, and the cathode brush is connected with the cathode of the small constant potential instrument.

[0008] In the preferred scheme, the screw gate hoist comprises a body, the screw is arranged inside the body and extends above the body, and the upper surface of the body is provided with an insulating sleeve which is sleeved outside the screw.

[0009] In the preferred scheme, the protection cover comprises two mounting barrels, an intermediate barrel is arranged between the two mounting barrels, and a top cover is arranged on the top of the upper mounting barrel, the protection cover is sleeved outside the screw.

[0010] In the preferred scheme, the mounting barrel comprises a barrel body, an installation groove is arranged inside the barrel body, the opening of the installation groove faces one side of the intermediate barrel, and a conductive ring is arranged inside the installation groove, the conductive ring is electrically connected with the anode of the small constant potential instrument.

[0011] In the preferred scheme, the fixed anode comprises a conductive anode arranged inside the mounting barrel, the conductive anode comprises a conductive support plate, an installation ring plate is sleeved outside the conductive support plate, the installation ring plate is connected with the barrel body through screws, one end of the conductive support plate away from the installation ring plate extends into the installation groove and tightly abuts against the conductive ring, a conductive blind hole is formed in the inner surface of the conductive support plate, and the inner surfaces of the conductive support plate and the conductive blind hole are provided with a conductive core layer.

[0012] In the preferred scheme, the cathode brush comprises an intermediate barrel, the intermediate barrel comprises a barrel body, a clamping groove is arranged inside the barrel body, a metal support ring and a conductive friction plate are sequentially arranged inside the clamping groove from outside to inside, an annular groove is arranged on the inner wall of the metal support ring, an annular spring is arranged inside the annular groove, the outer side of the conductive friction plate is connected with the metal support ring through conductive glue, the metal support ring is electrically connected with the cathode of the small constant potential instrument through a cable, and the annular spring tightly abuts against the conductive glue.

[0013] In the preferred scheme, the outer surface of the barrel body is provided with a threaded hole and a through hole, the threaded hole is in communication with the clamping groove, a pre-tightening screw is arranged inside the threaded hole, and one end of the pre-tightening screw is in contact with the outer surface of the metal support ring.

[0014] In the preferred scheme, a reference electrode is arranged inside the mounting barrel, and the reference electrode is electrically connected with the small constant potential instrument through a cable.

[0015] In the preferred solution, the protective cover comprises two mounting cylinders, a support frame is arranged between the two mounting cylinders, and a top cover is arranged at the top of the upper mounting cylinder; the support frame comprises a C-shaped frame, and support legs are arranged at the upper and lower ends of the C-shaped frame.

[0016] In the preferred solution, the cathode brush comprises a conductive brush, the conductive brush comprises a conductive shaft, the conductive shaft is arranged between the upper and lower walls of the C-shaped frame, and a brush plate is arranged outside the conductive shaft; a torsional spring is sleeved outside the conductive shaft, one end of the torsional spring is connected with the conductive shaft, the other end of the torsional spring is connected with the C-shaped frame, and the torsional spring is electrically connected with the cathode of the small constant potential instrument through a cable.

[0017] The application provides a detachable screw rod protection device for a screw rod type hoist, and has the following beneficial effects through the above solution: The application sets the insulation sleeve, the protective cover, the cathode brush, the fixed anode and the small constant potential instrument, so that the protective cover can simply protect the screw rod, and the cathode brush, the fixed anode and the small constant potential instrument cooperate with each other to form a cathode protection current to protect the screw rod. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be further described below in combination with the drawings and embodiments: Figure 1 A structure schematic view of a detachable screw rod protection device for a screw rod type hoist is provided for the embodiments of the application; Figure 2 A structure schematic view of a screw rod type hoist is provided for the embodiments of the application; Figure 3 A structure schematic view of a protective assembly in the first embodiment of the application is provided; Figure 4 A structure sectional view of Figure 3 ; Figure 5 A structure schematic view of a mounting cylinder in the embodiments of the application is provided; Figure 6 A structure schematic view of an intermediate cylinder in the embodiments of the application is provided; Figure 7 A structure schematic view of another view of Figure 6 ; Figure 8 A structure schematic view of a conductive ring in the embodiments of the application is provided; Figure 9 A structure schematic view of a conductive anode in the embodiments of the application is provided; Figure 10 A structure schematic view of a protective assembly in the second embodiment of the application is provided; Figure 11 A structure schematic view of a support frame in the embodiments of the application is provided; Figure 12 This is a schematic diagram of the connection structure between the conductive brush and the torsion spring in an embodiment of the present invention; The attached diagram lists the components represented by each number as follows: 1. Screw gate hoist; 111. Machine body; 112. Screw; 113. Insulating sleeve; 2. Miniature potentiostat; 3. Mounting cylinder; 31. Cylinder body; 32. Mounting groove; 4. Intermediate cylinder; 41. Cylinder body; 42. Snap-fit ​​groove; 43. Through hole; 44. Metal support ring; 45. Annular groove; 46. Annular spring; 47. Conductive friction plate; 48. Preload screw; 5. Top cover; 6. Conductive ring; 7. Conductive anode; 71. Conductive support plate; 72. Mounting ring plate; 73. Conductive blind hole; 8. Reference electrode; 9. Support frame; 91. C-frame; 92. Support leg; 10. Conductive brush; 101. Conductive shaft; 102. Brush plate; 11. Torsion spring. Detailed Implementation

[0019] Example 1: like Figure 1 As shown, a detachable screw-type gate hoist screw protection device includes a small potentiostat 2 and a protection component; The protective assembly is set on the top of the screw hoist 1 and includes a protective cover, a fixed anode and a cathode brush. The fixed anode and the cathode brush are both set on the outside of the screw 112 and cooperate with each other to form cathode protection for the screw 112. The fixed anode is connected to the anode of the small potentiostat 2 through a cable, and the cathode brush is connected to the cathode of the small potentiostat 2. Based on the above, the small constant current instrument 2 can provide current to the fixed anode and cathode brushes, and protect the screw 112 by forming cathode current protection to prevent the screw 112 from rusting. In addition, the protective cover provides initial protection for the screw 112 to avoid rainwater, sand and other elements from directly contacting the screw 112 as much as possible.

[0020] like Figure 2 As shown, the screw gate opener 1 includes a body 111, a screw 112 disposed inside the body 11 and extending above the body 111, and an insulating sleeve 113 disposed on the upper surface of the body 111. The insulating sleeve 113 is sleeved on the outside of the screw 112. The insulating sleeve 113 is a hollow cylindrical sleeve, and its inner diameter is designed according to the nominal diameter of the screw 112. It maintains a uniform radial gap of 0.5-1mm with the screw, which not only ensures insulation and isolation but also avoids jamming when the screw moves. The axial length is 30mm to ensure that it covers the connection section between the screw and the non-protected area, forming a complete insulation and isolation interface to prevent current leakage. Polytetrafluoroethylene (PTFE) or epoxy resin (EP) is preferred material. The surface is smooth and burr-free, and the inner wall processing accuracy reaches Ra0.8μm to reduce friction and wear with the screw. Based on the above, the insulating sleeve 113 plays a role in blocking current and avoids affecting the internal structure of the screw gate hoist 1 as much as possible, wherein the screw 112 and the body 111 are common structures of the screw gate hoist 1, and the description of the two structures here is only for the convenience of understanding the scheme.

[0021] As shown in Figure 1 and Figure 3 , the protective cover includes two installation barrels 3, an intermediate barrel 4 is arranged between the two installation barrels 3, and the top of the upper installation barrel 3 is provided with a top cover 5. The protective cover covers the outside of the screw 112. Based on the above, the setting of the protective cover plays a role in preliminary protection of the screw 112, and by covering the screw 112, the protective cover avoids the direct influence of external objects in the natural environment such as rain on the screw 112, and the protective cover is made of insulating material.

[0022] As shown in Figure 4 , Figure 5 , Figure 8 and Figure 9 , the installation barrel 3 includes a barrel body 31, the inside of the barrel body 31 is provided with an installation groove 32, the opening of the installation groove 32 faces one side of the intermediate barrel 4, and the inside is provided with a conductive ring 6, and the conductive ring 6 is electrically connected with the anode of the small constant potential instrument 2. The fixed anode includes a conductive anode 7 arranged in the installation barrel 3, the conductive anode 7 includes a conductive support plate 71, the conductive support plate 71 is preferably an annular titanium plate, an installation ring plate 72 is sleeved outside the conductive support plate 71, the installation ring plate 72 is connected with the barrel body 31 through screws, one end of the conductive support plate 71 away from the installation ring plate 72 extends to the inside of the installation groove 32 and tightly abuts against the conductive ring 6, a conductive blind hole 73 is formed in the inner surface of the conductive support plate 71, and the inner surfaces of the conductive support plate 71 and the conductive blind hole 73 are provided with a conductive core layer, the conductive core layer is preferably a titanium-based ruthenium iridium coating, and the upper and lower two conductive anodes 7 are arranged on the upper and lower sides of the cathode brush respectively. The upper conductive anode 7 is 15 cm away from the upper edge of the cathode brush, coaxially sleeved outside the screw 112, the center position of the lower conductive anode 7 is 20 cm away from the insulating sleeve 113, 15 cm away from the lower edge of the cathode brush, and also coaxially sleeved outside the screw 112. The radial gap between the conductive support plate 71 and the screw 112 is 8-10 mm, which can ensure that the current is uniformly radiated to the whole circumference of the screw 112, including the thread tooth peak and the thread tooth valley, and avoid the occurrence of current blind area, while being compatible with the slight radial jump (±2 mm) of the screw 112, preventing mechanical interference, and the setting significance is as follows: If the gap is too small (<8 mm), the screw 112 may collide with the anode during movement, causing damage to the anode coating or scratches on the surface of the screw 112, and the current may be too concentrated in a local area, causing over-protection. Too large spacing (> 10mm): current transmission loss in the electrolyte increases, the anode needs to output more current to make the screw rod 112 reach the target polarization potential, which increases the energy consumption, and may cause insufficient protection in the area far from the anode; The inside of the installation cylinder 3 is provided with a reference electrode 8, which is electrically connected to the small constant potential instrument 2 through a cable; Based on the above, the installation groove 32 provides space for the installation of the conductive ring 6, which is electrically connected to the small constant potential instrument 2 to provide current to the conductive anode 7. The setting of the conductive blind hole 73 increases the contact area, and the setting of the reference electrode 8 enables the small constant potential instrument 2 to accurately monitor the cathode potential, providing a basis for adjustment for the constant potential instrument, ensuring accurate protection current output, avoiding both insufficient protection (excessive potential) and overprotection (excessive potential leading to hydrogen embrittlement and coating blistering).

[0023] As shown in Figure 4 , Figure 6 and Figure 7 , the cathode brush includes a middle cylinder 4, which includes a cylinder body 41. The inside of the cylinder body 41 is provided with a clamping groove 42. The inside of the clamping groove 42 is sequentially provided with a metal support ring 44 and a conductive friction plate 47 from outside to inside. The metal support ring 44 is preferably made of red copper material. The conductive friction plate 47 is preferably made of graphite-copper powder composite material (copper powder content 35%). The inner wall of the metal support ring 44 is provided with an annular groove 45. The annular groove 45 is provided with an annular spring 46 inside. The annular spring 46 is made of insulating material, preferably high-elasticity polyurethane material. The outer side of the conductive friction plate 47 is connected to the metal support ring 44 through conductive adhesive, which is preferably silver powder conductive adhesive. The metal support ring 44 is electrically connected to the cathode of the small constant potential instrument 2 through a cable. The annular spring 46 is tightly attached to the conductive adhesive. The cross section of the annular spring 46 is a standard rectangle. The outer surface of the cylinder body 41 is provided with a threaded hole and a through hole 43. The threaded hole is in communication with the clamping groove 42. The inside of the threaded hole is provided with a pre-tightening screw 48. One end of the pre-tightening screw 48 is in contact with the outer surface of the metal support ring 44. Based on the above, the cathode brush as a whole adopts a coaxial nesting mechanism, which sequentially includes the cylinder body 41, the metal support ring 44, the annular spring 46, the conductive adhesive layer, and the conductive friction plate 47 from outside to inside. It contacts the screw rod 112 full circle 360°, ensuring uniform current transmission. The metal support ring 44 and the conductive adhesive serve to connect the conductive friction plate 47 and the cathode of the small constant potential instrument 2. The pre-tightening screw 48 is tightened to cause elastic deformation of the annular spring 46, providing pre-tightening force, so as to ensure that the screw rod 112 is always in contact with the conductive friction plate 47. The annular spring 46 made of polyurethane is the core elastic element for realizing elastic tensioning and stable current transmission of the annular brush. The structural design fully adapts to the coaxial nesting layout of the annular brush and the requirement of uniform pressure output of 360°. The specific structural details are as follows: The overall design is 360° annular and integrated, without splicing gaps, to ensure uniform distribution of circumferential elastic force. The cross section is a standard rectangle. The high-elasticity polyurethane material is selected, which has the following characteristics: Shore hardness 85-90D, tensile strength ≥30MPa, elongation at break ≥300%, compression permanent set ≤5% (70℃×24h), to ensure stable elastic properties under long-term pre-compression, while having good aging resistance, moisture resistance and chemical corrosion resistance, suitable for outdoor humid and salt spray environment. The annular structure of rectangular cross section can provide elastic compensation in both axial and radial directions. The axial direction compensates for the axial movement of the screw 112 (compensation amount ±5mm) through its own compression deformation. The radial direction compensates for the radial runout of the screw 112 (compensation amount ±2mm) through circumferential elastic deformation, to ensure that the conductive friction plate and the screw always maintain 360° close contact. The polyurethane material itself is an insulating material (volume resistivity ≥10¹²Ω cm), which avoids direct participation of the spring in current transmission, ensuring that the current is transmitted only through the path of metal support ring → conductive adhesive layer → conductive friction plate 47, preventing current leakage or short circuit. The through hole 43 is provided to make the internal environment of the protective cover and the external environment communicate with each other, so that the internal environment of the protective cover has sufficient humidity.

[0024] The working process of this embodiment is as follows: When the device is powered on, the constant potential instrument 2 collects the surface potential of the screw 112 (cathode) in real time through the reference electrode 8, and compares it with the preset immune potential interval (about-0.85V in carbon steel freshwater environment, relative to saturated calomel electrode). If the collected potential is higher than the immune potential (insufficient protection), the constant potential instrument 2 automatically increases the output current. The current is transmitted to all parallel annular anodes through the positive electrode cable. The anode undergoes anodic oxidation reaction through the titanium-based ruthenium-iridium coating on the surface, and uniformly radiates the protection current to the surrounding electrolyte environment (water film formed by air moisture and rainwater). In this process, the protection current forms a uniform current field in the electrolyte, which is transmitted to the screw 112 base through the conductive friction plate 47 of the annular brush (in 360° close contact with the screw), causing the screw 112 to undergo cathodic polarization, and the surface potential moves negatively to the immune interval, inhibiting the oxidation corrosion reaction (avoiding the dissolution of screw iron ions). If the collected potential is lower than the corrosion-free potential (over-protection), the potentiostat 2 reduces the output current until the potential stabilizes in the target range. When the screw 112 makes vertical reciprocating motion, the polyurethane spring built into the annular brush compensates for the displacement in real time (axial ±5mm, radial ±2mm) through elastic deformation, ensuring that the friction plate and the screw 112 are always in close contact and the current transmission is uninterrupted. At the same time, the molybdenum disulfide lubricant on the surface of the friction plate reduces sliding wear and extends the service life of the components.

[0025] Example 2; Based on Example 1, the cathode brush and protective cover are replaced, such as... Figure 10 - Figure 12 As shown, the protective cover includes two mounting cylinders 3, a support frame 9 is provided between the two mounting cylinders 3, a top cover 5 is provided on the top of the upper mounting cylinder 3, and the support frame 9 includes a C-shaped frame 91. The C-shaped frame 91 is made of insulating material, and support legs 92 are provided at both the upper and lower ends of the C-shaped frame 91. The cathode brush includes a conductive brush 10, which includes a conductive shaft 101. The conductive shaft 101 is disposed between the upper and lower walls of the C-frame 91 and has a brush plate 102 on its exterior. A torsion spring 11 is sleeved on the exterior of the conductive shaft 101. One end of the torsion spring 11 is connected to the conductive shaft 101 and the other end is connected to the C-frame 91. The torsion spring 11 is electrically connected to the cathode of the small potentiostat 2 via a cable. Based on the above, the vertical cathode brush here replaces the annular brush in Embodiment 1, and the torsion spring 11 provides elastic force so that the conductive brush 10 and the outer surface of the screw 112 come into contact with each other.

[0026] The working process of this embodiment is as follows: The core process of this embodiment is the same as that of embodiment one. The potentiostat 2 monitors the potential of the screw 112 and adjusts the output current through the reference electrode 8. The protective current output by the positive electrode of the potentiostat 2 is transmitted to the annular anode through the cable. The anode radiates current to the electrolyte environment, forming a current field around the screw 112. The protective current is transmitted to the screw 112 through two symmetrically arranged rod-shaped brushes: the current enters through the negative cable of the potentiostat 2 and is guided into the screw body by the conductive brush 10 (which is in close contact with the screw 112) to achieve cathodic polarization. When the screw 112 moves, the torsion spring 11 of the rod-shaped brush provides continuous elastic pressure (0.1~0.2MPa), which, together with the conductive brush 10, adapts to the vertical reciprocating motion and slight radial runout of the screw 112, ensuring stable contact between the brush plate 102 and the screw 112 and avoiding current interruption; the two symmetrical brushes ensure that the current is evenly distributed on both sides of the screw 112, making up for the lack of full circumference contact.

[0027] In summary, the protection device adopts the combination of physical protection and electrochemical cathodic protection, the protection cover can effectively block the contact of water vapor, impurities and corrosive medium in the external environment with the screw, the cathodic protection system fundamentally inhibits the oxidation and corrosion reaction of the screw, the double protection ensures the screw to keep good state for a long time in the harsh environment, significantly prolongs the service life of the screw, and reduces the equipment maintenance cost. Meanwhile, the protection cover is composed of the installation cylinder 3, the intermediate cylinder 4 / support frame 9, the top cover 5 and the like through flange or buckle connection, each component can be individually disassembled, the internal components are convenient to overhaul and replace, meanwhile, the daily maintenance of the screw 112 and the top components of the hoist is not affected; The reference electrode 8 cooperates with the small constant potential instrument 2 to realize the real-time monitoring and automatic adjustment of the protection potential, ensure that the screw 112 is always in the best protection state, and avoid the insufficient protection or over-protection.

[0028] The above-mentioned embodiments are only preferred technical solutions of the present application, and should not be regarded as limitation of the present application, the protection scope of the present application should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features recorded in the claims as the protection scope. That is, the equivalent replacement improvement within the scope is also within the protection scope of the present application.

Claims

1. A detachable screw protection device for a screw-type gate hoist, characterized in that: Includes a small potentiostat (2) and protective components; The protective assembly is set on the top of the screw hoist (1) and includes a protective cover, a fixed anode and a cathode brush. The fixed anode and the cathode brush are both set on the outside of the screw (112) and cooperate with each other to form a cathode protection for the screw (112). The fixed anode is connected to the anode of the small potentiostat (2) through a cable, and the cathode brush is connected to the cathode of the small potentiostat (2).

2. The detachable screw protection device for a screw-type gate hoist according to claim 1, characterized in that: The screw gate hoist (1) includes a body (111), a screw (112) is located inside the body (111) and extends to the top of the body (11), and an insulating sleeve (113) is provided on the upper surface of the body (111), which is fitted over the screw (112).

3. The detachable screw protection device for a screw-type gate hoist according to claim 1, characterized in that: The protective cover includes two mounting cylinders (3), an intermediate cylinder (4) is provided between the two mounting cylinders (3), and a top cover (5) is provided on the top of the upper mounting cylinder (3). The protective cover covers the outside of the screw (112).

4. The detachable screw protection device for a screw-type gate hoist according to claim 3, characterized in that: The mounting cylinder (3) includes a cylinder body (31), and a mounting groove (32) is provided inside the cylinder body (31). The opening of the mounting groove (32) faces one side of the intermediate cylinder (4), and a conductive ring (6) is provided inside. The conductive ring (6) is electrically connected to the anode of the small potentiostat (2).

5. The detachable screw protection device for a screw-type gate hoist according to claim 4, characterized in that: The fixed anode includes a conductive anode (7) disposed inside the mounting cylinder (3). The conductive anode (7) includes a conductive support plate (71). An mounting ring plate (72) is sleeved on the outside of the conductive support plate (71). The mounting ring plate (72) is connected to the cylinder body (31) by screws. One end of the conductive support plate (71) away from the mounting ring plate (72) extends into the interior of the mounting groove (32) and is tightly fitted with the conductive ring (6). A conductive blind hole (73) is opened on the inner surface of the conductive support plate (71). A conductive core layer is provided on the inner surface of both the conductive support plate (71) and the conductive blind hole (73).

6. The detachable screw protection device for a screw-type gate hoist according to claim 1, characterized in that: The cathode brush includes an intermediate cylinder (4), which includes a cylinder body (41). The cylinder body (41) has a snap-fit ​​groove (42) inside. The snap-fit ​​groove (42) has a metal support ring (44) and a conductive friction plate (47) arranged sequentially from the outside to the inside. The inner wall of the metal support ring (44) has an annular groove (45). The annular groove (45) has an annular spring (46) inside. The outer side of the conductive friction plate (47) is connected to the metal support ring (44) through conductive adhesive. The metal support ring (44) is electrically connected to the cathode of the small potentiostat (2) through a cable. The annular spring (46) is tightly attached to the conductive adhesive.

7. The detachable screw protection device for a screw-type gate hoist according to claim 6, characterized in that: The outer surface of the cylinder (41) is provided with a threaded hole and a through hole (43). The threaded hole is connected to the snap-fit ​​groove (42). A pre-tightening screw (48) is provided inside the threaded hole. One end of the pre-tightening screw (48) is in contact with the outer surface of the metal support ring (44).

8. The detachable screw protection device for a screw-type gate hoist according to claim 3, characterized in that: The mounting cylinder (3) is equipped with a reference electrode (8), which is electrically connected to the small potentiostat (2) via a cable.

9. The detachable screw protection device for a screw-type gate hoist according to claim 1, characterized in that: The protective cover includes two mounting cylinders (3), a support frame (9) is provided between the two mounting cylinders (3), a top cover (5) is provided on the top of the upper mounting cylinder (3), and the support frame (9) includes a C-shaped frame (91), with support legs (92) provided at both the upper and lower ends of the C-shaped frame (91).

10. A detachable screw-type gate hoist screw protection device according to claim 1, characterized in that: The cathode brush includes a conductive brush (10), the conductive brush (10) includes a conductive shaft (101), the conductive shaft (101) is disposed between the upper and lower walls of the C-frame (91), and a brush plate (102) is disposed on the outside. A torsion spring (11) is sleeved on the outside of the conductive shaft (101). One end of the torsion spring (11) is connected to the conductive shaft (101), and the other end is connected to the C-frame (91). The torsion spring (11) is electrically connected to the cathode of the small potentiostat (2) through a cable.

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