A kind of anti-skid environmental protection sleeve for local shielding of outer circle chrome plating of rod parts

Abstract

The present application relates to the field of chrome plating auxiliary tools, and discloses an anti-skid environment-friendly sleeve for local shielding of outer circle chrome plating of rod parts, which comprises an insulating sleeve, the insulating sleeve is sleeved on the outer part and is in gap cooperation with the outer wall of the part, at least one end of the insulating sleeve is provided with a current equalizing unit for ensuring uniform plating of the connection part of the insulating sleeve and the part, the current equalizing unit comprises a conductive ring, the conductive ring is fixedly sleeved on the end of the insulating sleeve and is flush with the end of the insulating sleeve, and an anti-skid fixing unit for limiting the sliding of the insulating sleeve on the part is arranged on the insulating sleeve, the anti-skid environment-friendly sleeve can ensure the uniformity of the plating, the boundary between the chrome plating area and the non-chrome plating area is clear, the plating at the boundary is uniform with the overall plating, the part does not need to be cleaned again, the use of plating materials can be effectively reduced, the generation of subsequent chromium-containing waste liquid can be reduced, the product quality can be improved, the production cost can be reduced, and the environmental protection performance can be improved.

Description

Technical Field

[0001] This invention relates to the field of chrome plating auxiliary tools, and more particularly to an anti-slip and environmentally friendly sleeve for partial shielding of the outer circumference of rod-shaped parts during chrome plating. Background Technology

[0002] Rod-type parts are common and diverse in the injection molding machine industry. To prevent surface corrosion from long-term exposure to air and to ensure that the outer surface of parts in long-term service is not worn, hard chrome plating is required to achieve surface wear resistance and corrosion resistance. Due to assembly or technical requirements, these rod-type parts often have threaded and grooved areas at both ends where hard chrome plating is not allowed, or a certain section in the middle is required to be unplated.

[0003] In the chrome plating industry, typically, such as Figure 1 As shown, for the outer circular section of part 3, which is required not to be plated with hard chrome, plastic film 1 is first wrapped around the circumference, then spirally wrapped around the length several times, and then wrapped around the end again in the circumference. Finally, electrical tape 2 and other plastic materials are used to firmly attach the film to the outside of the film to prevent the film from loosening or accidentally falling off when soaked in the chrome plating solution.

[0004] The principle is to use the non-conductive properties of plastics to create a natural shield between the outer circle of the part and the electric field in the chromium plating solution. It is a traditional shielding method with the advantages of good anti-chromium plating effect, low operation difficulty, and the wide availability of plastic film, electrical tape and other materials, which are general-purpose items.

[0005] It is important to note that even for regular outer circular areas, multiple layers of film are required to prevent accidental damage during lifting, handling, or pretreatment of the parts. In particular, several layers should be applied to threaded areas to ensure that the film is not cut by the thread tips during the wrapping process, which could result in the damaged area being plated with hard chrome and causing the part to fail.

[0006] Existing problems: 1. Environmentally unfriendly.

[0007] After the parts are immersed in the chromium plating solution for chromium plating, the film and tape undergo a washing process to remove residual chromic acid adhering to the chromium plating layer. However, even this cannot completely eliminate the chromic acid solution remaining between the film layers. This is due to the pervasive nature of the solution and the fact that chromium plating is always carried out at around 60°C, inevitably causing slight loosening between the plastic film layers. It is well known that a significant portion of the environmental pollution caused by chromium plating is due to the chromic acid solution, which contains chromic acid, sulfuric acid, and various additives.

[0008] 2. The post-plating secondary cleaning process is complex and increases environmental risks.

[0009] For manual chromium plating production lines, after the parts are plated and cleaned, when they are ready to be lifted out of the clean water tank, the covering film and tape can be cut off manually with a blade or other tools. At this time, the outer circle of the parts will also have residual chromic acid because the water flow cannot directly rinse it. The covered parts will be rinsed and cleaned again, and the wastewater will automatically return to the cleaning tank.

[0010] However, for automated chromium plating production lines, the post-plating cleaning process cannot be manually intervened frequently. The parts can only be cleaned a second time after they have completely come out of the production line. At this time, the water after cleaning is chromium-containing wastewater and cannot flow directly into the sewage pipe network. Instead, it must be collected completely and treated together with other chromium-containing wastewater. In actual production, it is often difficult to collect the wastewater completely, which increases the risk of chromium-containing wastewater overflow.

[0011] 3. Post-processing costs for waste containing chromium films and tapes.

[0012] According to environmental protection requirements, films and tapes containing residual chromic acid solution, and even plastic gloves worn during the aforementioned operations, are now considered chromium-containing waste and cannot be mixed with household waste or ordinary industrial waste. Specialized disposal of chromium-containing solid waste must be arranged, and prolonged storage is also detrimental to the health of workshop employees.

[0013] Based on the above problems, the shielding device disclosed in Chinese Patent No. CN202047162U, entitled "Piston Rod Electroplating Connection Shielding Sleeve", is to extend the electroplating of one piston rod to N rods to improve production efficiency, but it has no effect on the post-plating cleaning of residual chromic acid at the connection and the control of the plating thickness at the connection.

[0014] Chinese patent CN211689263U, entitled "Hard Chrome Electroplated Shielding Cover Assembly for Shock Absorber Piston Rod," describes a shielding cover assembly for chrome plating at both ends of a piston rod. Its principle is to utilize the insulation of PVC to create physical shielding, while multiple grooves are opened around the circumference of the shielding cover to reduce the concentration of electric field lines at both ends, thereby achieving a uniform plating thickness. However, this device is only suitable for shielding the piston rod ends and cannot effectively shield the smooth middle section. The lower shielding cover has a threaded core that engages with the threaded end of the mounting plate to fix the entire lower shielding cover. After chrome plating, even rinsing with water cannot completely remove the residual chrome plating solution from this area, requiring secondary cleaning after removing the shielding cover. This is inconvenient and poses an environmental hazard of wastewater overflow. Summary of the Invention

[0015] This invention addresses the problem in existing technologies where, to achieve chrome plating of rod-shaped parts, a shielding cover is needed in areas where chrome plating is not required. However, existing shielding covers, after chrome plating, result in increased plating thickness at the connection point with the part, leading to poor plating uniformity. Furthermore, chrome plating is difficult to clean completely in one pass, requiring secondary cleaning, which significantly increases the chrome-containing waste liquid content, posing a significant risk of spillage and resulting in high treatment costs. This invention provides an anti-slip, environmentally friendly sleeve for partial shielding of the outer circumference of rod-shaped parts during chrome plating, offering uniform plating and improved environmental performance.

[0016] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An anti-slip and environmentally friendly sleeve for partial shielding of chrome plating on the outer circumference of rod-like parts includes an insulating sleeve. The insulating sleeve is fitted over the part and has a clearance fit with the outer wall of the part. At least one end of the insulating sleeve is provided with a current equalization unit to ensure uniform plating at the connection between the insulating sleeve and the part. The current equalization unit includes a conductive ring, which is fixedly fitted to the end of the insulating sleeve and flush with the end of the insulating sleeve. An anti-slip fixing unit is provided on the insulating sleeve to limit the sliding of the insulating sleeve on the part.

[0017] The principle of this scheme is as follows: at the boundary between the conductive parts and the insulating sleeve, the current is concentrated due to the insulation of the sleeve. After adding the current equalization unit, the conductive ring of the current equalization unit is fixedly sleeved on the end of the insulating sleeve, and the ends of the two are flush. In this way, the current concentrated at the connection will be evenly distributed on the conductive ring, thereby achieving the uniformity of the chromium plating layer at the connection and avoiding the phenomenon of the plating layer being thicker than the surface of the parts. The part covered by the insulating sleeve will not form a plating layer. The local anti-chromium plating and the plating layer boundary are clear, and the plating layer at the boundary is consistent with the plating layer thickness of other parts of the parts. This anti-slip and environmentally friendly sleeve can be removed after the parts are cleaned once, and the parts do not need to be cleaned a second time. It can effectively reduce the use of plating materials and reduce the generation of subsequent chromium-containing waste liquid, and has the advantages of reducing production costs and improving environmental performance.

[0018] Preferably, the conductive ring is made of low-carbon carbon steel; the insulating sleeve is made of plastic.

[0019] Preferably, the length of the conductive ring is in the range of 5mm to 20mm; and the thickness of the insulating sleeve is in the range of 1mm to 5mm.

[0020] Preferably, a conductive reinforcement unit is provided on the insulating sleeve, the conductive reinforcement unit being located on the inner wall of the insulating sleeve and its end being connected to the current equalization unit.

[0021] Preferably, the conductive reinforcement unit includes at least one conductive strip disposed inside the insulating sleeve, the conductive strip being fixed to the inner wall of the insulating sleeve and having one end bent and fixed to the conductive ring.

[0022] Using the above scheme, the conductive strip has two functions. First, during the electroplating process, it ensures that the conductive ring and the cathode part are electrically conductive to each other, thus becoming part of the cathode and enabling the conductive ring to function as a current distributor. Second, the conductive strip, which is fixed to the inner wall of the plastic sleeve, strengthens the insulating sleeve when it is fixed to the part.

[0023] Preferably, two conductive strips are symmetrically arranged around the center of the part.

[0024] By adopting the above scheme, the two symmetrically arranged forces are more evenly distributed.

[0025] Preferably, the conductive strip is bent 180° at one end near the conductive ring to form a first fold, and the first fold is welded to the outer wall of the conductive ring.

[0026] Preferably, the conductive strip is bent 180° at one end near the conductive ring to form a first folded edge. The first folded edge is attached to the outer wall of the conductive ring, and the end of the first folded edge away from the conductive strip is bent inward by 90° to form a second folded edge. The second folded edge abuts against the end of the conductive ring away from the end of the insulating sleeve.

[0027] Using the above solution, after setting the second fold, the conductive strip can be driven to support the conductive ring without welding, thus fixing itself and the conductive ring.

[0028] Preferably, the anti-slip fixing unit includes at least one clamping mechanism arranged circumferentially or axially along the insulating sleeve. The clamping mechanism includes an internal threaded sleeve protruding on the outer wall of the insulating sleeve and a locking bolt that engages with the internal threaded sleeve. The locking bolt passes through the insulating sleeve and the rear end of the conductive strip and abuts against the outer wall of the part.

[0029] Using the above solution, the locking bolt is used to press against the surface of the part to tighten it. After the locking bolt passes through the conductive strip, the second fold of the conductive strip and the conductive ring cooperate to limit the conductive strip on the insulating sleeve.

[0030] Preferably, the end of the locking bolt is fixed with an anti-scratch layer, which is a low-hardness alloy layer, a plastic layer, or a polymer elastic layer; the locking bolt is an internal hex bolt, an external hex bolt, or a hinged bolt.

[0031] By adopting the above solution, the anti-scratch layer can protect the surface of the parts. For parts that do not require polishing or surface quality after plating, it can prevent contact marks from being left after plating, which would affect the appearance. All of the above types of bolts are suitable for use as locking bolts, which can improve disassembly and assembly efficiency and reduce labor intensity.

[0032] This invention, by employing the above technical solutions, achieves significant technical effects: At the boundary between the conductive part and the insulating sleeve, the current is concentrated due to the sleeve's insulation. With the addition of a current-equalizing unit, the conductive ring of the current-equalizing unit is fixedly fitted onto the end of the insulating sleeve, with both ends flush. This ensures that the current concentrated at the connection is evenly distributed onto the conductive ring, thereby achieving uniformity of the chromium plating layer at the connection and preventing the plating layer from being thicker than the surface of the part. The portion covered by the insulating sleeve will not form a plating layer. The boundary between the anti-chromium plating area and the plating area is clear, and the plating layer at the boundary has the same thickness as the plating layer on other parts of the part. Furthermore, a conductive reinforcement unit is added, specifically including a conductive strip. The conductive strip has two functions. Firstly, during the electroplating process, the conductive ring is ensured to conduct electricity with the cathode component, thus becoming part of the cathode and allowing the conductive ring to function as a current distributor. Secondly, the conductive strip, which adheres to the inner wall of the plastic sleeve, strengthens the insulating sleeve when it is fixed to the component. This anti-slip and environmentally friendly sleeve ensures the uniformity of the plating layer, with clear boundaries between the anti-chrome plating and chrome plating areas, and good uniformity of the plating layer at the boundaries with the overall plating layer. The component can be removed after one cleaning, eliminating the need for secondary cleaning. This effectively reduces the use of plating materials, improves component quality, and reduces the generation of subsequent chrome-containing waste liquid. It has the advantages of improving product quality, reducing production costs, and enhancing environmental performance. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a local anti-chrome plating device for existing rod-type parts; Figure 2 This is an isometric view of the anti-slip environmentally friendly sleeve suitable for the anti-plating layer at the end of a part, as described in Example 1. Figure 3 This is a cross-sectional view of the anti-slip environmentally friendly sleeve suitable for anti-plating coating at the end of the part in Example 1 during the assembly of the part; Figure 4 This is an isometric view of the anti-slip environmentally friendly sleeve suitable for the anti-plating layer in the middle of the part in Example 2 during the assembly of the part; Figure 5 This is a cross-sectional view of the anti-slip environmentally friendly sleeve applicable to the anti-plating layer in the middle of the part in Example 2 during the assembly of the part; Figure 6 yes Figure 5 A magnified view of A; Figure 7 This is a cross-sectional view of the anti-slip environmentally friendly sleeve suitable for large-area anti-plating coating in the middle of large-diameter parts, as described in Example 3, during the assembly of the parts; Figure 8 yes Figure 7 A magnified view of B.

[0034] The parts referred to by the numbers in the above attached figures are as follows: 1. Plastic film; 2. Electrical tape; 3. Parts; 4. Insulating sleeve; 5. Conductive ring; 6. Conductive strip; 7. First fold; 8. Internal threaded sleeve; 9. Locking bolt; 10. Second fold; 11. Anti-scratch layer. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0036] Example 1 An anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-type parts 3 includes an insulating sleeve 4, which is sleeved on the outside of two parts and has a clearance fit with the outer wall of the parts 3. A flow equalization unit is provided at one end of the insulating sleeve 4 to ensure uniform plating at the connection between the insulating sleeve 4 and the parts 3. An anti-slip fixing unit is provided on the insulating sleeve 4 to limit the sliding of the insulating sleeve 4 on the parts 3.

[0037] The insulating sleeve 4 is made of plastic, specifically PVC or PP, with a preferred thickness of 1mm to 5mm. The thickness is proportional to the diameter of the part 3. The larger the diameter of the part 3, the thicker the insulating sleeve 4 should be. This can increase the ease of locking the insulating sleeve 4 with the part 3. If the thickness is too small, it is easy to deform during long-term use, which will affect the service life. For small and medium diameter parts 3, the insulating sleeve 4 with a thinner thickness should be selected as much as possible to reduce the weight and facilitate handling.

[0038] The current equalization unit includes a conductive ring 5, the length of which ranges from 5mm to 20mm. The material is low-carbon steel, specifically Q235A or 20 steel. The conductive ring 5 is fixedly sleeved on the end of the insulating sleeve 4 and is flush with the end of the insulating sleeve 4. At the boundary between the conductive part 3 and the insulating sleeve 4, the current is originally concentrated in one place due to the insulation of the insulating sleeve 4. However, due to the setting of the conductive ring 5, the current at the boundary can be evenly distributed to the conductive ring 5, thereby achieving a uniform chromium plating layer thickness.

[0039] The anti-slip fixing unit includes clamping mechanisms symmetrically arranged on both sides of the insulating sleeve 4. The clamping mechanism includes an internally threaded sleeve 8 protruding on the outer wall of the insulating sleeve 4 and a locking bolt 9 that mates with the internally threaded sleeve 8. The locking bolt 9 passes through the rear end of the insulating sleeve 4 and abuts against the outer wall of the part 3. The locking bolt 9 can be an internal hexagonal bolt, an external hexagonal bolt, or a hinged bolt. In this embodiment, a hinged bolt is used. To avoid contact marks on the surface of the part 3, an anti-scratch layer 11 is fixed to the end of the locking bolt 9. The anti-scratch layer 11 is a low-hardness alloy layer, a plastic layer, or a polymer elastic layer. In this embodiment, the anti-scratch layer 11 is a low-hardness alloy layer, specifically an aluminum alloy layer, which is fixed to the locking bolt 9 by welding or cladding.

[0040] A conductive reinforcing unit is provided between the insulating sleeve 4 and the conductive ring 5. The conductive reinforcing unit includes at least one conductive strip 6 provided inside the insulating sleeve 4. In this embodiment, two conductive strips are symmetrically provided. The conductive strip 6 is fixed to the inner wall of the insulating sleeve 4 and one end is bent and welded to the conductive ring 5.

[0041] The above embodiments are applicable to the application of anti-chrome plating at the ends of small and medium-sized rod parts. For example, for a rod part with a diameter of 60mm and a length of 2000mm, the upper half of the outer circle is required to be chrome-plated, while a small section of the outer circle and groove near the lower end, totaling 200mm, is not plating. The local deviation of the chrome plating layer thickness is no more than 4μm. Insulating sleeve 4 Design reference Figures 2-3 As shown, the insulating sleeve 4 is made of PVC with a thickness of 1mm, an inner diameter of 61mm, and an overall length of 210mm. The conductive ring 5 has a thickness of 0.5mm and a width of 10mm. It is fixed to the conductive strip 6 by welding. The conductive strip 6 is welded to the insulating sleeve 4 and directly contacts the part 3 through the locking bolt 9 to form the cathodicization of the conductive ring 5.

[0042] The specific operating steps include: Step 1: Clean the surface of part 3, insert the insulating sleeve 4 from the bottom of part 3, ensure that the conductive ring 5 is located at the junction of the chrome-plated and non-chrome-plated parts of part 3, and tighten the locking bolt 9 with a wrench or air gun to complete the installation of the sleeve; Step 2: After the chrome plating cleaning in the tank is completed, unscrew the locking bolt 9 of the insulating sleeve 4, and remove the insulating sleeve 4 from the end of the part 3 along the length direction with both hands. Check the surface integrity. The part 3 and the insulating sleeve 4 do not need to be cleaned again and are ready for the next use.

[0043] Results: The area protected by the insulating sleeve 4 was confirmed to be free of plating, and the thickness difference of the chrome plating layer was within 3 μm. The insulating sleeve 4 did not fall off during the chrome plating process, and the installation and disassembly were clean and efficient.

[0044] Example 2 The difference between this embodiment and embodiment 1 is that, referring to... Figures 4-6 As shown, conductive rings 5 ​​are symmetrically arranged on both sides of insulating sleeve 4. The two ends of conductive strip 6 are bent 180° and welded to the two conductive rings 5. Locking bolts 9 pass through insulating sleeve 4 and conductive strip 6 in sequence, and the rear ends abut against the outer wall of part 3.

[0045] This embodiment applies to local anti-chrome plating in the middle of part 3. For example, a rod-like part with a diameter of 80mm and a length of 2500mm is required to be chrome-plated at both ends, but the middle 400mm long area must not be chrome-plated. There must be no extrusion marks on the surface of this area after plating, and the local deviation of the chrome plating layer thickness must not exceed 4 μm.

[0046] The insulating sleeve 4 is made of PP material, 2mm thick, with an inner diameter of 81mm and an overall length of 400mm. Conductive rings 5, 0.5mm thick and 10mm wide, are installed at both ends of the insulating sleeve 4 and are fixed to the insulating sleeve 4 by welding to the conductive strip 6. The conductive strip 6 runs through the entire insulating sleeve 4 and is welded to the internal threaded sleeve 8. The locking bolt 9 passes through the insulating sleeve 4 and the conductive strip 6, and its rear end contacts the part 3, thus forming the cathodic protection of the conductive ring 5. A low-hardness alloy for preventing impact damage is welded to the front end of the locking bolt 9 to avoid residual extrusion marks on the surface of the part 3 after plating.

[0047] Step 1: Clean the surface of part 3, insert the insulating sleeve 4 into either end of part 3, ensuring that the conductive ring 5 is located at the junction of the chrome-plated and non-chrome-plated parts of part 3, and tighten the locking bolt 9 using a wrench or air gun to complete the installation of the insulating sleeve 4.

[0048] Step 2: After the chrome plating cleaning in the tank is completed, unscrew the locking bolt 9, and use both hands to remove the insulating sleeve 4 from the end of the part 3 along the length direction. Check the surface integrity. The part 3 and the insulating sleeve 4 do not need to be cleaned again and are ready for the next use.

[0049] Results: The area protected by the insulating sleeve 4 was confirmed to be free of plating and had good surface quality. The thickness difference of the chrome plating layer was within 3 μm. The sleeve did not fall off during the chrome plating process, and the installation and disassembly were clean and efficient.

[0050] Example 3 The difference between this embodiment and Embodiment 2 is that, referring to... Figure 7 As shown in Figure 8, at least two sets of anti-slip fixing units are arranged at intervals along the axial direction of the insulating sleeve 4 to enhance the firmness of the insulating sleeve 4 on the part 3. In this embodiment, two sets of anti-slip fixing units are arranged at intervals along the axial direction of the insulating sleeve. After the two ends of the conductive strip 6 are bent 180° to form the first folded edge 7, they are bent inward 90° to form the second folded edge 10 and abut against the opposite side of the conductive ring 5 to wrap and support the conductive ring 5, thereby limiting the conductive ring 5.

[0051] This embodiment applies to the chrome plating prevention of the middle section of rod-shaped parts 3 with large diameter and large shielding area. For example, a rod-shaped part with a diameter of 200mm and a length of 5000mm requires chrome plating at both ends, but the middle 600mm section must not be chrome plating. The local deviation of the chrome plating thickness should not exceed 4 μm.

[0052] The insulating sleeve 4 is made of PVC material, with a thickness of 3mm and an inner diameter of 201mm. The overall length of the insulating sleeve 4 is 600mm. Conductive rings 5 ​​with a thickness of 0.5mm and a width of 10mm are set at both ends of the insulating sleeve 4. They are fixed by conductive strips 6, which run through the entire insulating sleeve 4 and are welded to the end of the internal threaded sleeve 8 near the center of the insulating sleeve 4. The locking bolt 9 passes through the internal threaded sleeve 8, the insulating sleeve 4, and the conductive strip 6 in sequence and then abuts against the outer wall of the part 3, thereby forming the cathodicization of the conductive rings 5.

[0053] Step 1: Clean the surface of part 3, insert the insulating sleeve 4 into either end of part 3, ensuring that the conductive ring 5 is located at the junction of the chrome-plated and non-chrome-plated parts of part 3, and tighten the locking bolt 9 with a wrench or air gun to complete the installation of the insulating sleeve 4.

[0054] Step 2: After the chrome plating cleaning in the tank is completed, unscrew the locking bolt 9 of the insulating sleeve 4, and remove the insulating sleeve 4 from the end of the part 3 along the length direction with both hands. Check the surface integrity. The part 3 and the insulating sleeve 4 do not need to be cleaned again and are ready for the next use.

[0055] Results: The area protected by the insulating sleeve 4 was confirmed to be unplated, with a chrome plating thickness difference of within 3 μm. The sleeve did not fall off during the chrome plating process, and the installation and disassembly were clean and efficient.

Claims

1. An anti-slip and environmentally friendly sleeve for partial shielding of the outer circumference of rod-shaped parts with chrome plating, comprising an insulating sleeve (4), characterized in that: The insulating sleeve (4) is fitted over the part (3) with a clearance fit to the outer wall of the part (3). At least one end of the insulating sleeve (4) is provided with a current equalization unit to ensure uniform plating at the connection between the insulating sleeve (4) and the part (3). The current equalization unit includes a conductive ring (5). The conductive ring (5) is fixedly fitted over the end of the insulating sleeve (4) and is flush with the end of the insulating sleeve (4). An anti-slip fixing unit is provided on the insulating sleeve (4) to limit the sliding of the insulating sleeve (4) on the part (3).

2. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 1, characterized in that: The conductive ring (5) is made of low-carbon carbon steel; the insulating sleeve (4) is made of plastic.

3. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 2, characterized in that: The length of the conductive ring (5) ranges from 5mm to 20mm; the thickness of the insulating sleeve (4) ranges from 1mm to 5mm.

4. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 1, characterized in that: A conductive reinforcement unit is provided on the insulating sleeve (4). The conductive reinforcement unit is located on the inner wall of the insulating sleeve (4) and its end is connected to the current equalization unit.

5. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 4, characterized in that: The conductive reinforcement unit includes at least one conductive strip (6) disposed inside the insulating sleeve (4). The conductive strip (6) is fixed to the inner wall of the insulating sleeve (4) and one end is bent and fixed to the conductive ring (5).

6. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 5, characterized in that: The conductive strip (6) has two symmetrically arranged around the part (3).

7. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 5, characterized in that: The conductive strip (6) is bent 180° at one end near the conductive ring (5) to form a first fold (7), and the first fold (7) is welded to the outer wall of the conductive ring (5).

8. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 5, characterized in that: The conductive strip (6) is bent 180° at one end near the conductive ring (5) to form a first fold (7). The first fold (7) is attached to the outer wall of the conductive ring (5), and the end of the first fold (7) away from the conductive strip (6) is bent inward by 90° to form a second fold (10). The second fold abuts against the end of the conductive ring (5) away from the insulating sleeve (4).

9. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 8, characterized in that: The anti-slip fixing unit includes at least one clamping mechanism arranged circumferentially or axially along the insulating sleeve (4). The clamping mechanism includes an internal threaded sleeve (8) protruding on the outer wall of the insulating sleeve (4) and a locking bolt (9) cooperating with the internal threaded sleeve (8). The locking bolt (9) passes through the insulating sleeve (4) and the rear end of the conductive strip (6) and abuts against the outer wall of the part (3).

10. The anti-slip and environmentally friendly sleeve for partial chrome plating shielding of the outer circle of rod-like parts according to claim 9, characterized in that: The end of the locking bolt (9) is fixed with an anti-scratch layer (11), which is a low-hardness alloy layer, a plastic layer, or a polymer elastic layer; the locking bolt (9) is an internal hexagonal bolt, an external hexagonal bolt, or a hinged bolt.

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