Surface treatment method of high-strength corrosion-resistant precision piston rod

Abstract

The invention discloses a surface treatment method of a high-strength corrosion-resistant precision piston rod, and relates to the technical field of surface treatment. A plurality of supporting legs are fixedly connected to the bottom of a bottom plate, a cleaning mechanism is fixedly connected to the top of the bottom plate and used for waking a piston rod, two pipe bodies are symmetrically arranged in the bottom plate, the outer side faces of the pipe bodies are fixedly connected with the inner side face of the bottom plate, and a partition plate is arranged at the interval of the two pipe bodies. The two sides of the partition plate are fixedly connected with the sides, close to each other, of the two pipe bodies correspondingly, the communicating assembly is obliquely arranged at the interval of the two pipe bodies, the surfaces of the two pipe bodies are fixedly connected with the outer side face of the communicating assembly correspondingly, and the lifting assemblies are arranged in the pipe bodies and used for lifting a cleaned piston rod. Foam generated by grease emulsification floats in one pipe body, and then the piston rod is taken out from the other pipe body, so that the taken-out piston rod is prevented from being contaminated by floating foam, and secondary pollution is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of surface treatment, and in particular to a surface treatment method for a high-strength, corrosion-resistant, precision piston rod. Background Art

[0002] The piston rod is a connecting part used in oil cylinders, gas cylinders and other motion actuators to support the piston in doing work. It has high technical requirements due to frequent movements and collisions. Therefore, the quality of piston rod processing directly affects the life and reliability of the entire product including the piston and piston rod.

[0003] Hot-dip galvanizing is a metal anti-corrosion process. After degreasing, pickling, and plating, the steel workpiece is immersed in molten zinc liquid. Zinc and iron react to form a zinc-iron alloy layer and a pure zinc layer on the surface of the workpiece. With the electrochemical protection of the zinc layer, the workpiece can resist erosion by corrosive media such as the atmosphere and water. It is widely used in construction steel, transmission towers, automotive parts, etc., and has both cost-effectiveness and long-term protection advantages. Pretreatment is usually required before hot-dip galvanizing to remove impurities such as grease on the surface of the piston rod, so we proposed a surface treatment method for high-strength and corrosion-resistant precision piston rods. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a surface treatment method for a high-strength, corrosion-resistant, precision piston rod, comprising the following steps:

[0005] S1. Pre-treatment: Place the piston rod in a cleaning device to completely wet the workpiece. The cleaning device first uses a water-based metal degreasing cleaning agent to remove oil, dust and other impurities on the surface of the piston rod. Then, take out the cleaned workpiece, wash off the cleaning agent, and then immerse it in dilute hydrochloric acid to remove iron oxide and rust on the surface. Then, rinse it, and dry and preheat it.

[0006] S2, hot dip plating, the pre-treated and preheated workpiece is slowly or intermittently immersed in molten zinc liquid, the zinc liquid temperature is generally controlled at about 435-445℃, and the immersion plating is carried out for 2 minutes. During the immersion plating process, zinc reacts with iron to form a zinc-iron alloy layer on the surface of the workpiece;

[0007] S3. Take out and cool. After the zinc dipping is completed, take the workpiece out of the zinc liquid and place it in the cooling area for natural cooling or water cooling. The cooling water temperature should be maintained between 50-80℃ and the pH value should be between 6.5-9. During the cooling process, the zinc layer will gradually solidify to form a solid zinc coating. Use a special vibrator for hot-dip galvanizing to remove the residual zinc and zinc nodules on the surface.

[0008] S4, passivation drying, immerse the workpiece in chromate passivation solution for 15 to 30 seconds. The chromate ions, hydrogen ions, etc. in the passivation solution react chemically with the surface of the plated metal to form a passivation film containing chromium oxide, hydroxide and chromate. Then take out the piston rod and rinse it. Dry the rinsed workpiece with hot air to ensure that there is no moisture residue on the surface of the workpiece.

[0009] Furthermore, the cleaning equipment comprises:

[0010] A bottom plate, the bottom of which is fixedly connected with supporting legs, and the number of the supporting legs is set to be several;

[0011] A cleaning mechanism, which is fixedly connected to the top of the bottom plate and is used for cleaning the piston rod;

[0012] Wherein, the cleaning mechanism comprises:

[0013] Tube bodies, wherein two tube bodies are symmetrically arranged inside the bottom plate, the outer side surfaces of the tube bodies are fixedly connected to the inner side surfaces of the bottom plate, a partition is arranged at the interval between the two tube bodies, and the two sides of the partition are respectively fixedly connected to the sides of the two tube bodies close to each other;

[0014] A connecting component, wherein the connecting component is obliquely arranged at the interval between the two tube bodies, and the surfaces of the two tube bodies are respectively fixedly connected to the outer side surfaces of the connecting component;

[0015] A lifting assembly, which is arranged inside the tube body and is used to lift the cleaned piston rod;

[0016] Put the piston rod into a tube body, then drop it to the top of the lifting component, soak it for a while, wash off the oil, then start the lifting component, the lifting component will lift the piston rod and slide it into the connecting component, then slide it into another tube body, fully absorb impurities except oil, the inclined connecting component connects the two tube bodies to form a connecting vessel, ensuring that the liquid levels in the two tube bodies are always equal, avoiding the overflow of cleaning liquid due to the concentrated investment of the piston rod into one tube body, and the inclined connecting component can slide into the other tube body under the action of gravity, the foam generated by the emulsification of grease floats in one tube body, and then the piston rod is taken out from the other tube body, thereby preventing the taken out piston rod from being contaminated with foam and avoiding secondary pollution.

[0017] Furthermore, a discharge pipe is provided on one side of the two tube bodies close to the supporting legs, the outer side surface of the discharge pipe is fixedly connected to the inner side surface of the tube body, and the discharge pipe is controlled by a valve. The valve of the discharge pipe is opened to discharge the cleaning liquid and the impurities washed off, thereby completing the replacement of the cleaning liquid.

[0018] Furthermore, the lifting assembly includes an inclined filter plate, which is arranged at one end of the connecting assembly away from the bottom plate, and the inner side surface of the tube body is slidably connected to the surface of the inclined filter plate. The piston rod falls to the top of the inclined filter plate, and after sufficient immersion to remove the grease, the inclined filter plate is driven to rise, and the piston rod is lifted to the upward end of the connecting assembly. Since the inclined filter plate is inclined, the piston rod can roll into the interior of the connecting assembly.

[0019] Furthermore, a flat filter plate is provided on the side of the connecting component away from the inclined filter plate, and the surface of the flat filter plate is slidably connected to the inner side surface of the tube body. A driving component is provided at the bottom of the flat filter plate to drive the flat filter plate to rise, and the flat filter plate slides in the tube body. After the flat filter plate is raised, it is convenient to take out the piston rod, and the tube body cavity space at the bottom of the flat filter plate is increased, thereby generating suction. The cleaning liquid passes through the flat filter plate, thereby generating flow, and the piston rod on the flat filter plate is washed. The inclined filter plate is washed in the same way.

[0020] Furthermore, a telescopic frame is fixedly connected to one side of the flat filter plate close to the bottom plate, and a side of the telescopic frame away from the flat filter plate is fixedly connected to an inner side surface of the tube body. A groove body is provided on the side of the telescopic frame close to the bottom plate. When the flat filter plate rises, the telescopic frame is driven to extend and retract, and the telescopic frame covers the pipe opening of the connecting component to prevent the piston rod from falling into the bottom of the flat filter plate when unloading. The cleaning liquid passes through the flat filter plate and then passes through the groove body.

[0021] The cam is provided with a pair of sliding rods, each of which has an end which penetrates the tube body and an inner side of the tube body, and the inner side of the tube body is fixedly connected to the outer side of the slide rod, and the side of the inclined filter plate close to the bottom plate is fixedly connected to the bracket, and the side of the bracket away from the inclined filter plate is fixedly connected to the end of the slide rod located inside the tube body, and the side of the flat filter plate close to the bottom plate is fixedly connected to the end of the slide rod located inside the tube body.

[0022] Furthermore, a spring is symmetrically arranged on one side of the connecting plate close to the base plate, the spring is fixedly connected to the side of the connecting plate close to the base plate, and one end of the spring away from the connecting plate is fixedly connected to the side of the tube body close to the connecting plate. The connecting plate moves, driving the spring to deform, thereby acting as a buffer.

[0023] Furthermore, the connecting component includes an inclined tube, both ends of the inclined tube are provided with buffer rings, the outer side surface of the inclined tube is fixedly connected to the inner side surface of the buffer ring, the outer side surface of the buffer ring is fixedly connected to the inner side surface of the tube body, the inner side surface of the inclined tube is fixedly connected with a bent plate, the bent plate is bent toward the side close to the bottom plate, a plurality of groups of bent plates are provided, each group of bent plates is evenly distributed along the circumference of the inclined tube, and the bent plates are made of elastic material, the piston rod slides into the inclined tube, slides out of the inclined tube under the action of gravity, and a relative movement occurs between the bent plate and the piston rod, thereby scrubbing the surface of the piston rod to remove some impurities that are difficult to remove by immersion, and the bent plate can delay the time for the piston rod to leave the inclined tube, thereby achieving a better scrubbing effect, the inclined inclined tube, floating impurities such as foam, float out at the inclined high point of the inclined tube under the action of buoyancy, and the floating impurities such as foam are concentrated into a tube body.

[0024] Furthermore, the outer side surface of the inclined tube is fixedly connected to a sleeve plate, the outer side surface of the sleeve plate is fixedly connected to a shaft body, the end of the shaft body away from the sleeve plate is fixedly connected to a vibration motor, the outer side surface of the vibration motor is fixedly connected to a fixing plate, the side of the fixing plate away from the vibration motor is fixedly connected to the outer side surface of the tube body, and the vibration motor is started, the vibration motor drives the shaft body to vibrate, the sleeve plate to vibrate, the inclined tube to vibrate, and the bent plate to swing, thereby achieving a better scrubbing effect, and when the inclined tube vibrates, impurities such as foam are driven away from the inclined tube, thereby preventing impurities from adhering to the inner side surface of the inclined tube, and the buffer ring is provided to buffer the inclined tube.

[0025] The present invention has the beneficial effects:

[0026] 1. The present invention connects two tubes to form a communicating vessel by providing a cleaning mechanism and an obliquely arranged connecting component, thereby ensuring that the liquid levels in the two tubes are always equal, thereby preventing the cleaning liquid from overflowing due to the piston rod being concentrated in one tube. The obliquely arranged connecting component can slide into the other tube under the action of gravity, and the foam generated by the emulsification of the grease floats in one tube. Then, the piston rod is taken out from the other tube, thereby preventing the taken out piston rod from being contaminated with foam and avoiding secondary pollution.

[0027] 2. The present invention provides a connecting component to increase the cavity space of the tube body at the bottom of the flat filter plate, thereby generating suction. The cleaning liquid passes through the flat filter plate, thereby generating flow, and washes the piston rod on the flat filter plate. The inclined filter plate is washed in the same way. The telescopic frame covers the pipe opening of the connecting component to prevent the piston rod from falling into the bottom of the flat filter plate when unloading.

[0028] 3. The present invention sets a connecting component to generate relative movement between the bent plate and the piston rod, thereby scrubbing the surface of the piston rod to remove some impurities that are difficult to remove by immersion, and the bent plate can delay the time for the piston rod to leave the inclined tube, thereby achieving a better scrubbing effect. The inclined tube is set obliquely, and floating impurities such as foam float out at the inclined high point of the inclined tube under the action of buoyancy, and the floating impurities such as foam are concentrated in one tube body.

[0029] 4. The present invention achieves a better scrubbing effect by arranging a vibration motor and swinging the bent plate. When the inclined tube vibrates, impurities such as floating foam are driven away from the inclined tube, thereby preventing impurities from adhering to the inner side of the inclined tube. The buffer ring is arranged to buffer the inclined tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the surface treatment method of the high-strength, corrosion-resistant, precision piston rod of the present invention;

[0031] Figure 2 It is a schematic diagram of the cleaning mechanism structure of the present invention;

[0032] Figure 3 It is a schematic diagram of the pipe structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the feed pipe of the present invention;

[0034] Figure 5 It is a schematic diagram of the cross-sectional structure of the tube body of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the even filter plate of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the drive assembly of the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of the connection components of the present invention.

[0038] In the figure: 1. bottom plate; 2. supporting legs; 3. cleaning mechanism; 31. pipe body; 32. partition; 33. connecting component; 331. inclined pipe; 332. buffer ring; 333. sleeve plate; 334. shaft body; 335. vibration motor; 336. fixing plate; 337. bending plate; 34. lifting component; 341. inclined filter plate; 342. flat filter plate; 343. driving component; 3431. sliding rod; 3432. bracket; 3433. connecting plate; 3434. telescopic rod; 3435. spring; 344. telescopic frame; 345. trough body; 35. discharge pipe. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0040] Example 1, please refer to Figure 1-Figure 8 The present invention is a surface treatment method for a high-strength, corrosion-resistant, precision piston rod, comprising the following steps:

[0041] S1. Pre-treatment: Place the piston rod in a cleaning device to completely wet the workpiece. The cleaning device first uses a water-based metal degreasing cleaning agent to remove oil, dust and other impurities on the surface of the piston rod. Then, take out the cleaned workpiece, wash off the cleaning agent, and then immerse it in dilute hydrochloric acid to remove iron oxide and rust on the surface. Then, rinse it, and dry and preheat it.

[0042] S2, hot dip plating, the pre-treated and preheated workpiece is slowly or intermittently immersed in molten zinc liquid, the zinc liquid temperature is generally controlled at about 435-445℃, and the immersion plating is carried out for 2 minutes. During the immersion plating process, zinc reacts with iron to form a zinc-iron alloy layer on the surface of the workpiece;

[0043] S3. Take out and cool. After the zinc dipping is completed, take the workpiece out of the zinc liquid and place it in the cooling area for natural cooling or water cooling. The cooling water temperature should be maintained between 50-80℃ and the pH value should be between 6.5-9. During the cooling process, the zinc layer will gradually solidify to form a solid zinc coating. Use a special vibrator for hot-dip galvanizing to remove the residual zinc and zinc nodules on the surface.

[0044] S4, passivation drying, immerse the workpiece in chromate passivation solution for 15 to 30 seconds. The chromate ions, hydrogen ions, etc. in the passivation solution react chemically with the surface of the plated metal to form a passivation film containing chromium oxide, hydroxide and chromate. Then take out the piston rod and rinse it. Dry the rinsed workpiece with hot air to ensure that there is no moisture residue on the surface of the workpiece.

[0045] Cleaning equipment includes:

[0046] A base plate 1, the bottom of which is fixedly connected with a supporting leg 2, and the number of the supporting legs 2 is set to be several;

[0047] A cleaning mechanism 3, which is fixedly connected to the top of the bottom plate 1 and is used for cleaning the piston rod;

[0048] Wherein, the cleaning mechanism 3 comprises:

[0049] Tube bodies 31, two tube bodies 31 are symmetrically arranged inside the bottom plate 1, the outer side of the tube body 31 is fixedly connected to the inner side of the bottom plate 1, a partition plate 32 is arranged at the interval between the two tube bodies 31, and the two sides of the partition plate 32 are respectively fixedly connected to the sides of the two tube bodies 31 close to each other;

[0050] A connecting component 33, which is obliquely arranged at the interval between the two tube bodies 31, and the surfaces of the two tube bodies 31 are respectively fixedly connected to the outer side surfaces of the connecting component 33;

[0051] A lifting assembly 34, which is disposed inside the tube body 31 and is used to lift the cleaned piston rod;

[0052] The piston rod is placed into one tube body 31 and then dropped to the top of the lifting component 34. After soaking for a while and washing away the oil stains, the lifting component 34 is started. The lifting component 34 lifts the piston rod and slides it into the connecting component 33, and then slides it into the other tube body 31 to fully absorb impurities except oil stains. The connecting component 33 is arranged obliquely to connect the two tube bodies 31 to form a communicating vessel, ensuring that the liquid levels in the two tube bodies 31 are always equal, avoiding overflow of the cleaning liquid due to the concentrated insertion of the piston rod into one tube body 31, and the connecting component 33 arranged obliquely can slide into the other tube body 31 under the action of gravity, and the foam generated by the emulsification of the grease floats in one tube body 31, and then the piston rod is taken out from the other tube body 31, thereby avoiding the piston rod being contaminated with foam and avoiding secondary pollution.

[0053] A discharge pipe 35 is provided on one side of the two tube bodies 31 close to the supporting leg 2. The outer side surface of the discharge pipe 35 is fixedly connected to the inner side surface of the tube body 31, and the discharge pipe 35 is controlled by a valve. The valve of the discharge pipe 35 is opened to discharge the cleaning liquid and the impurities washed off, thereby completing the replacement of the cleaning liquid.

[0054] The lifting component 34 includes an inclined filter plate 341, which is arranged at the end of the connecting component 33 away from the bottom plate 1, and the inner side surface of the tube body 31 is slidingly connected to the surface of the inclined filter plate 341. The piston rod falls to the top of the inclined filter plate 341. After sufficient immersion to remove grease, the inclined filter plate 341 is driven to rise, and the piston rod is lifted to the upward end of the connecting component 33. Since the inclined filter plate 341 is inclined, the piston rod can roll into the interior of the connecting component 33.

[0055] A flat filter plate 342 is provided on one side of the connecting component 33 away from the inclined filter plate 341, and the surface of the flat filter plate 342 is slidably connected to the inner side surface of the tube body 31. A driving component 343 is provided at the bottom of the flat filter plate 342 to drive the flat filter plate 342 to rise, and the flat filter plate 342 slides in the tube body 31. After the flat filter plate 342 is raised, it is convenient to take out the piston rod, and the cavity space of the tube body 31 at the bottom of the flat filter plate 342 is enlarged, thereby generating suction, and the cleaning liquid passes through the flat filter plate 342, thereby generating flow, and the piston rod on the flat filter plate 342 is washed, and the inclined filter plate 341 is washed in the same way.

[0056] A telescopic frame 344 is fixedly connected to one side of the flat filter plate 342 close to the bottom plate 1, and a side of the telescopic frame 344 away from the flat filter plate 342 is fixedly connected to the inner side surface of the tube body 31, and a groove body 345 is provided on the side of the telescopic frame 344 close to the bottom plate 1. The flat filter plate 342 rises, driving the telescopic frame 344 to extend and retract, and the telescopic frame 344 covers the pipe opening of the connecting component 33 to prevent the piston rod from falling into the bottom of the flat filter plate 342 when unloading. The cleaning liquid passes through the flat filter plate 342 and then passes through the groove body 345.

[0057] The driving assembly 343 includes a slide bar 3431. The slide bar 3431 is arranged inside the two tube bodies 31. The end of the slide bar 3431 close to the bottom plate 1 passes through the tube body 31, and the inner side of the tube body 31 is fixedly connected to the outer side of the slide bar 3431. The side of the inclined filter plate 341 close to the bottom plate 1 is fixedly connected to a bracket 3432. The side of the bracket 3432 away from the inclined filter plate 341 is fixedly connected to the end of the slide bar 3431 located inside the tube body 31. The side of the flat filter plate 342 close to the bottom plate 1 is fixedly connected to the end of the slide bar 3431 away from the inclined filter plate 341 located inside the tube body 31. The side of the partition plate 32 close to the support leg 2 is fixedly connected to a telescopic rod 3434, one end of the telescopic rod 3434 away from the partition 32 is fixedly connected with a connecting plate 3433, and the side of the connecting plate 3433 close to the bottom plate 1 is fixedly connected to the side of the two sliding rods 3431 away from the tube body 31. The telescopic rod 3434 is started, and the telescopic rod 3434 drives the connecting plate 3433 to rise, and the connecting plate 3433 drives the two sliding rods 3431 to move, and finally the inclined filter plate 341 and the flat filter plate 342 rise, and the inclined filter plate 341 supports the piston rod into the connecting component 33, and then the telescopic frame 344 covers the other end of the connecting component 33, and at the same time the flat filter plate 342 lifts the previous batch of piston rods to facilitate the removal of the piston rods after cleaning.

[0058] A spring 3435 is symmetrically arranged on one side of the connecting plate 3433 close to the base plate 1. The spring 3435 is fixedly connected to the side of the connecting plate 3433 close to the base plate 1. One end of the spring 3435 away from the connecting plate 3433 is fixedly connected to the side of the tube body 31 close to the connecting plate 3433. The movement of the connecting plate 3433 drives the spring 3435 to deform, thereby playing a buffering role.

[0059] Example 2, please refer to Figure 1-Figure 8 The connecting component 33 includes an inclined tube 331, and buffer rings 332 are provided at both ends of the inclined tube 331. The outer side surface of the inclined tube 331 is fixedly connected to the inner side surface of the buffer ring 332, and the outer side surface of the buffer ring 332 is fixedly connected to the inner side surface of the tube body 31. The inner side surface of the inclined tube 331 is fixedly connected to a bent plate 337, and the bent plate 337 is bent toward the side close to the bottom plate 1. The bent plates 337 are provided in a plurality of groups, and each group of bent plates 337 is evenly distributed along the circumference of the inclined tube 331. The bent plates 337 are made of elastic material. The piston rod slides into the inclined tube 331 and slides out of the inclined tube 331 under the action of gravity. The bent plate 337 and the piston rod move relative to each other, thereby scrubbing the surface of the piston rod to remove some impurities that are difficult to remove by immersion. The bent plate 337 can delay the time for the piston rod to leave the inclined tube 331, thereby achieving a better scrubbing effect. The inclined tube 331 is inclined, and floating impurities such as foam float out at the inclined high point of the inclined tube 331 under the action of buoyancy, and the floating impurities such as foam are concentrated into a tube body 31.

[0060] The outer side surface of the inclined tube 331 is fixedly connected to a sleeve plate 333, the outer side surface of the sleeve plate 333 is fixedly connected to a shaft body 334, the end of the shaft body 334 away from the sleeve plate 333 is fixedly connected to a vibration motor 335, the outer side surface of the vibration motor 335 is fixedly connected to a fixing plate 336, the side of the fixing plate 336 away from the vibration motor 335 is fixedly connected to the outer side surface of the tube body 31, and the vibration motor 335 is started, the vibration motor 335 drives the shaft body 334 to vibrate, the sleeve plate 333 vibrates, the inclined tube 331 vibrates, and drives the bent plate 337 to swing, thereby achieving a better scrubbing effect, and when the inclined tube 331 vibrates, impurities such as foam are driven away from the inclined tube 331, thereby preventing impurities from adhering to the inner side surface of the inclined tube 331, and the buffer ring 332 is provided to buffer the inclined tube 331.

[0061] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A surface treatment method for a high-strength, corrosion-resistant, precision piston rod, characterized in that: The following steps are involved: S1, pre-treatment, placing the piston rod in a cleaning device to completely soak the workpiece, first using a water-based metal degreasing cleaning agent to remove oil, dust and impurities on the surface of the piston rod, then taking out the cleaned workpiece, washing off the cleaning agent, and then immersing it in dilute hydrochloric acid to remove iron oxide and rust on the surface, then rinsing, and drying and preheating; S2, hot dip plating, the pre-treated and preheated workpiece is slowly or intermittently immersed in molten zinc liquid, the zinc liquid temperature is generally controlled at about 435-445℃, and the immersion plating is carried out for 2 minutes. During the immersion plating process, zinc reacts with iron to form a zinc-iron alloy layer on the surface of the workpiece; S3. Take out and cool. After the zinc dipping is completed, take the workpiece out of the zinc liquid and place it in the cooling area for natural cooling or water cooling. The cooling water temperature should be maintained between 50-80℃ and the pH value should be between 6.5-9. During the cooling process, the zinc layer will gradually solidify to form a solid zinc coating. Use a special vibrator for hot-dip galvanizing to remove the residual zinc and zinc nodules on the surface. S4, passivation drying, immerse the workpiece in chromate passivation solution for 15 to 30 seconds. The chromate ions, hydrogen ions, etc. in the passivation solution react chemically with the surface of the plated metal to form a passivation film containing chromium oxide, hydroxide and chromate. Then take out the piston rod and rinse it. Dry the rinsed workpiece with hot air to ensure that there is no moisture residue on the surface of the workpiece.

2. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 1 is characterized in that: The cleaning equipment comprises: A base plate (1), wherein a support leg (2) is fixedly connected to the bottom of the base plate (1), and the number of the support legs (2) is set to be a plurality; A cleaning mechanism (3), the cleaning mechanism (3) is fixedly connected to the top of the bottom plate (1) and is used for cleaning the piston rod; Wherein, the cleaning mechanism (3) comprises: Tube bodies (31), wherein two tube bodies (31) are symmetrically arranged inside the bottom plate (1), the outer side surfaces of the tube bodies (31) are fixedly connected to the inner side surfaces of the bottom plate (1), a partition plate (32) is arranged at the interval between the two tube bodies (31), and the two sides of the partition plate (32) are respectively fixedly connected to the sides of the two tube bodies (31) that are close to each other; A connecting component (33), wherein the connecting component (33) is arranged obliquely at the interval between the two tube bodies (31), and the surfaces of the two tube bodies (31) are respectively fixedly connected to the outer side surface of the connecting component (33); A lifting assembly (34) is arranged inside the tube body (31) and is used to lift the cleaned piston rod.

3. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 2 is characterized in that: A discharge pipe (35) is provided on one side of the two tube bodies (31) close to the supporting leg (2); the outer side surface of the discharge pipe (35) is fixedly connected to the inner side surface of the tube body (31), and the discharge pipe (35) is controlled by a valve.

4. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 3 is characterized by: The lifting assembly (34) comprises an inclined filter plate (341), the inclined filter plate (341) being arranged at one end of the connecting assembly (33) away from the bottom plate (1), and the inner side surface of the tube body (31) is slidably connected to the surface of the inclined filter plate (341).

5. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 4 is characterized in that: A flat filter plate (342) is provided on one side of the connecting component (33) away from the inclined filter plate (341), and the surface of the flat filter plate (342) is slidably connected to the inner side surface of the tube body (31), and a driving component (343) is provided at the bottom of the flat filter plate (342).

6. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 5, characterized in that: A telescopic frame (344) is fixedly connected to a side of the flat filter plate (342) close to the bottom plate (1); a side of the telescopic frame (344) away from the flat filter plate (342) is fixedly connected to an inner side surface of the tube body (31); and a groove (345) is provided on a side of the telescopic frame (344) close to the bottom plate (1).

7. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 6, characterized in that: The driving assembly (343) comprises a slide bar (3431), and the inside of the two tube bodies (31) are both provided with a slide bar (3431), and the end of the slide bar (3431) close to the bottom plate (1) passes through the tube body (31), and the inner side surface of the tube body (31) is fixedly connected to the outer side surface of the slide bar (3431), and the side of the inclined filter plate (341) close to the bottom plate (1) is fixedly connected to a bracket (3432), and the side of the bracket (3432) away from the inclined filter plate (341) and the slide bar (3431) are located inside the tube body (31). One end of the flat filter plate (342) is fixedly connected to the bottom plate (1), one side of the flat filter plate (342) is fixedly connected to one end of the slide rod (3431) away from the inclined filter plate (341) and located inside the tube body (31), one side of the partition plate (32) is fixedly connected to a telescopic rod (3434) close to the support leg (2), one end of the telescopic rod (3434) away from the partition plate (32) is fixedly connected to a connecting plate (3433), and one side of the connecting plate (3433) close to the bottom plate (1) is fixedly connected to one side of the two slide rods (3431) away from the tube body (31).

8. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 7, characterized in that: A spring (3435) is symmetrically arranged on one side of the connecting plate (3433) close to the bottom plate (1); the spring (3435) is fixedly connected to the side of the connecting plate (3433) close to the bottom plate (1); and one end of the spring (3435) away from the connecting plate (3433) is fixedly connected to the side of the tube body (31) close to the connecting plate (3433).

9. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 8, characterized in that: The connecting component (33) comprises an inclined tube (331), both ends of the inclined tube (331) are provided with buffer rings (332), the outer side surface of the inclined tube (331) is fixedly connected to the inner side surface of the buffer ring (332), the outer side surface of the buffer ring (332) is fixedly connected to the inner side surface of the tube body (31), the inner side surface of the inclined tube (331) is fixedly connected to a bent plate (337), the bent plate (337) is bent toward a side close to the bottom plate (1), a plurality of groups of the bent plates (337) are provided, each group of the bent plates (337) is evenly distributed along the circumference of the inclined tube (331), and the bent plates (337) are made of elastic material.

10. The surface treatment method of a high-strength, corrosion-resistant precision piston rod according to claim 9, characterized in that: The outer side surface of the inclined tube (331) is fixedly connected to a sleeve plate (333), the outer side surface of the sleeve plate (333) is fixedly connected to a shaft body (334), one end of the shaft body (334) away from the sleeve plate (333) is fixedly connected to a vibration motor (335), the outer side surface of the vibration motor (335) is fixedly connected to a fixing plate (336), and the side of the fixing plate (336) away from the vibration motor (335) is fixedly connected to the outer side surface of the tube body (31).

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