A processing apparatus for a powder metallurgy product sealing process

Abstract

This application relates to a processing equipment for sealing pores in powder metallurgy products, belonging to the technical field of powder metallurgy workpiece processing equipment. The equipment includes a main impregnation tank, a vacuum extraction unit, a liquid supply unit, and a pressurization unit. The top of the main impregnation tank is sequentially equipped with a liquid injection port, an exhaust and pressure relief valve, a vacuum extraction port, and a pressurization port. The bottom of the main impregnation tank is equipped with a drain port and a hose threading sealing flange. A workpiece basket for accommodating powder metallurgy tool steel workpieces is slidably arranged inside the main impregnation tank, and a compensation bladder is provided at the bottom of the workpiece basket. An anti-boiling baffle is longitudinally slidably arranged in the upper part of the inner cavity of the main impregnation tank. The vacuum extraction unit is connected to the vacuum extraction port. The liquid supply unit is connected to both the liquid injection port at the top of the main impregnation tank and the drain port at the bottom of the main impregnation tank. The pressurization unit is connected to the pressurization port. This application has the technical effect of improving impregnation uniformity and sealing stability, while avoiding boiling and splashing of the impregnating liquid and improving safety.

Description

Technical Field

[0001] This application relates to the technical field of powder metallurgy workpiece processing equipment, and in particular to a processing equipment for a sealing process of powder metallurgy products. Background Technology

[0002] After powder metallurgy tool steel is sintered, it contains numerous micropores, which can easily lead to defects such as water seepage, oil seepage, and corrosion, severely affecting the sealing performance and service life of the workpiece. Therefore, a pore-sealing impregnation process is needed to seal the pores of powder metallurgy tool steel workpieces. The equipment used for this process is specialized processing equipment for vacuum impregnation and pressure sealing of powder metallurgy tool steel workpieces.

[0003] Existing equipment for sealing powder metallurgy products has a simple structure and limited function. When impregnating powder metallurgy tool steel workpieces, it lacks an adaptive immersion adjustment structure, which easily leads to uneven immersion and insufficient impregnation during the impregnation process. At the same time, the equipment lacks an effective anti-boiling structure, and the impregnating liquid is prone to boiling and splashing under vacuum conditions. This not only affects the sealing quality of powder metallurgy tool steel workpieces, but also results in poor operational safety and insufficient process stability.

[0004] Regarding the aforementioned technologies, the inventors believe that they suffer from drawbacks such as poor uniformity of hole sealing in powder metallurgy tool steel workpieces, low process stability, and insufficient operational safety. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a processing device for the sealing process of powder metallurgy products.

[0006] This application provides a processing equipment for sealing pores in powder metallurgy products, which adopts the following technical solution: A processing device for sealing powder metallurgy products includes a main impregnation vessel, a vacuum extraction unit, a liquid supply unit, and a pressurization unit. The main impregnation vessel has a liquid injection port, a venting and pressure relief valve, a vacuum extraction port, and a pressurization port sequentially located at its top. The bottom of the main impregnation vessel has a drain port and a hose threading and sealing flange. A workpiece basket for accommodating powder metallurgy tool steel workpieces is slidably disposed inside the main impregnation vessel, and a compensation bladder is located at the bottom of the workpiece basket. An anti-boiling baffle is longitudinally slidably disposed on the upper part of the inner cavity of the main impregnation vessel. The vacuum extraction unit is connected to the vacuum extraction port. The liquid supply unit is connected to both the liquid injection port at the top of the main impregnation vessel and the drain port at the bottom of the main impregnation vessel. The pressurization unit is connected to the pressurization port.

[0007] By adopting the above technical solution, and by integrating the main impregnation vessel, vacuum extraction unit, liquid supply unit, and pressurization unit, and relying on the liquid injection port, exhaust pressure relief valve, vacuum extraction port, pressurization port at the top of the main impregnation vessel, and the liquid discharge port and hose threading sealing flange at the bottom, the functions of impregnation liquid injection, pressure relief, vacuum extraction, pressurized impregnation, liquid discharge, and pipeline sealing and threading can be realized respectively. The workpiece basket sliding inside the main impregnation vessel realizes the stable loading and unloading of powder metallurgy tool steel workpieces. With the structural cooperation of the compensation bladder and the anti-boiling baffle, the equipment can stably complete the vacuum negative pressure impregnation and pressurized sealing process, effectively improving the sealing density of powder metallurgy products. At the same time, by accurately connecting each unit to the corresponding interface of the main impregnation vessel, the equipment process is integrated and automated, improving the overall sealing efficiency and process stability.

[0008] Preferably, the bottom of the workpiece basket is a breathable grid; a fixed support frame is provided below the compensation bladder; the fixed support frame is fixedly installed on the inner wall of the bottom of the main impregnation tank, and the compensation bladder abuts against the fixed support frame; the explosion-proof baffle is a porous sieve plate structure.

[0009] By adopting the above technical solutions, the ventilated grid at the bottom of the workpiece basket ensures the all-round penetration and flow of the impregnation liquid, guaranteeing uniform contact between the surface and micropores of the powder metallurgy tool steel workpiece and the impregnation liquid, avoiding impregnation dead zones; the fixed support frame installed below the compensation bladder provides stable support for the compensation bladder, limits the deformation range of the compensation bladder, prevents the compensation bladder from collapsing or shifting under pressure, and ensures stable and reliable support and lifting of the compensation bladder; the anti-boiling baffle adopts a porous sieve plate structure, which effectively breaks up the bubbles generated by the impregnation liquid when the negative pressure fluctuates in the reactor, suppresses the boiling and splashing of the impregnation liquid in the vacuum environment, effectively protects the workpiece processing quality, and improves the safety of the main impregnation reactor operation.

[0010] Preferably, the liquid supply unit includes a storage tank, a liquid supply pump, a main liquid supply pipeline, a drain pipeline, a hydraulic distributor, a hydraulic pressure guide pipe, and a slag discharge assembly. The liquid supply pump is located at the outlet end of the storage tank, and the outlet end of the storage tank is connected to the inlet end of the main liquid supply pipeline via the liquid supply pump. The outlet end of the main liquid supply pipeline is connected to the injection port. The hydraulic distributor is connected in series in the middle section of the main liquid supply pipeline. A drive hose is provided on the first branch port of the hydraulic distributor, and the hydraulic distributor is connected to the compensation bladder through the drive hose, passing through the hose threaded sealing flange. A hydraulic pressure guide pipe is provided on the second branch port of the hydraulic distributor, and the second branch port of the hydraulic distributor is connected to the slag discharge assembly via the hydraulic pressure guide pipe. A switch valve is provided in the drain port, one end of the drain pipeline is connected to the drain port, and the other end of the drain pipeline is connected to the storage tank.

[0011] By adopting the above technical solution, the impregnation solution is centrally stored in a storage tank, and automated and precise injection is achieved through the cooperation of the supply pump, the main supply pipeline, and the injection port. A hydraulic distributor connected in series in the middle of the main supply pipeline diverts the hydraulic medium for output. One path, via a drive hose passing through a hose-sealed flange, provides hydraulic power to the compensation bladder, enabling adaptive compensation for workpiece immersion and ensuring uniform impregnation. The other path, via a hydraulic pressure guide pipe, provides driving power to the slag discharge assembly, achieving linkage between the supply and discharge actions. The switching valve inside the discharge port, in conjunction with the discharge pipeline, ensures stable reflux and recycling of the impregnation solution after the impregnation operation, effectively reducing impregnation solution loss and improving the automation level and utilization rate of the solution.

[0012] Preferably, the slag discharge assembly includes a slag discharge hydraulic cylinder, an unlocking plate, and a slag discharge flap; the slag discharge hydraulic cylinder is fixed to the outer side of the bottom of the storage tank; the rodless chamber of the slag discharge hydraulic cylinder is connected to the hydraulic pressure guide pipe; a slag discharge port is provided at the bottom of the storage tank, one end of the slag discharge flap is rotatably connected to one side of the slag discharge port, and a torsion spring is provided at the connection between the slag discharge flap and the slag discharge port; a sealing ring is provided on the upper surface of the slag discharge flap; one end of the unlocking plate is slidably disposed at the bottom of the storage tank on one side of the slag discharge port, and the other end of the unlocking plate abuts against the lower surface of the slag discharge flap; the side of the push rod end of the slag discharge hydraulic cylinder is fixedly connected to one side of the unlocking plate; a return spring is sleeved on the push rod end of the slag discharge hydraulic cylinder.

[0013] By adopting the above technical solution, a stable hydraulic driving force is provided by a slag discharge hydraulic cylinder fixed to the outside of the bottom of the storage tank. The rodless chamber of the slag discharge hydraulic cylinder receives the pressure medium transmitted by the hydraulic pressure guide pipe to realize the extension and retraction of the push rod. The push rod drives the unlocking plate to slide and switch the limit state. With the help of the torsion spring, the slag discharge flap automatically opens and closes, which can automatically complete the slag discharge operation at the bottom of the storage tank. The sealing ring set on the upper surface of the slag discharge flap can ensure the sealing performance after the slag discharge port is closed, effectively preventing the leakage of leachate. The push rod is automatically reset by the reset spring sleeved on the push rod end of the slag discharge hydraulic cylinder, which ensures the stable operation of the slag discharge component in a cyclical manner, effectively improving the automation level of slag discharge and avoiding the accumulation of waste residue from affecting the purity of the leachate.

[0014] Preferably, the medicine storage tank is equipped with a scraping structure, which includes a drive rod, a slider, a connecting rod, a rotating shaft, a support rod, and a scraper. A rotating sealing sleeve is provided at the center of the top of the medicine storage tank. The rotating shaft passes through the rotating sealing sleeve and is rotatably connected to the medicine storage tank. The slider is slidably disposed on the top of the medicine storage tank, and a crank is fixedly disposed at one end of the rotating shaft. One end of the connecting rod is rotatably disposed at one end of the crank, and the other end of the connecting rod is rotatably disposed on the slider. One end of the support rod is fixedly disposed at the other end of the rotating shaft, and the scraper is fixedly disposed at the other end of the support rod. The scraper abuts against the inner wall of the medicine storage tank. One end of the drive rod is fixedly disposed on the slider, and the other end of the drive rod is fixedly connected to the push rod end of the slag discharge hydraulic cylinder.

[0015] By adopting the above technical solution, the push rod end of the slag discharge hydraulic cylinder drives the drive rod, which in turn drives the slider to slide on the top of the storage tank. The rotating shaft is driven by the connecting rod and crank transmission to rotate stably with the rotating sealing sleeve. The rotating sealing sleeve can effectively ensure the sealing of the storage tank during the rotation of the rotating shaft and prevent leakage of the medicine. The rotating shaft drives the support rod and the scraper to rotate synchronously in the circumferential direction, so that the scraper continuously adheres to the inner wall of the storage tank to perform scraping operations. This can promptly remove the deposited impurities attached to the inner wall of the storage tank, avoid the accumulation of impurities and contamination of the leachate, continuously ensure the cleanliness of the leachate, effectively improve the sealing treatment quality of powder metallurgy products, and enhance the continuous operation capability of the equipment.

[0016] Preferably, a filter return pump structure is provided at the slag discharge port, the filter return pump structure includes a water leakage trough and a return pump; one end of the water leakage trough is located below the slag discharge port, and the water leakage trough is fixedly connected to the bottom of the medicine storage tank; a filter screen is provided inside the water leakage trough; one end of the return pump is connected to the other end of the water leakage trough, and the other end of the return pump is connected to the medicine storage tank.

[0017] By adopting the above technical solution, a water-cooled trough located below the slag discharge port is used to collect the solid-liquid mixture of the discharged slag. The filter screen inside the water-cooled trough is used to achieve precise solid-liquid separation and effectively intercept solid waste residue impurities. The clean leachate after filtration can be pumped back into the storage tank, realizing the filtration, recovery and recycling of the leachate. This significantly reduces the material loss of the leachate, saves production costs, and avoids pipeline blockage and liquid contamination caused by waste residue flowing back with the liquid, thus ensuring the stable operation of the equipment's liquid supply system.

[0018] Preferably, the vacuum extraction unit includes a high vacuum pump and a main vacuum pipeline; the high vacuum pump is connected to the vacuum extraction port through the main vacuum pipeline; and a drive component is provided at the exhaust port of the high vacuum pump.

[0019] By adopting the above technical solution, the air inside the main impregnation vessel is stably extracted by a high vacuum pump in conjunction with the main vacuum pipeline and vacuum extraction port, and a uniform negative pressure environment is quickly formed inside the main impregnation vessel. This facilitates the full penetration of the impregnation liquid into the micropores of the powder metallurgy workpiece, thereby improving the sealing effect. At the same time, the drive component set at the exhaust port of the high vacuum pump is used to recover and utilize the exhaust kinetic energy, thereby realizing the utilization of waste energy.

[0020] Preferably, the driving assembly includes a bellows-type hot-pressing airbag, a three-way exhaust pipe, a lever, and a contact rod; the first connection port of the three-way exhaust pipe is connected to the exhaust port of the high vacuum pump, the second connection port of the three-way exhaust pipe is connected to the bellows-type hot-pressing airbag, one end of the bellows-type hot-pressing airbag is fixedly mounted on the main impregnation vessel, a driving port is provided at the center of the top of the main impregnation vessel, the contact rod is slidably mounted in the driving port, and the bottom of the contact rod abuts against the anti-boiling baffle; the lever is rotatably mounted on the top of the main impregnation vessel, one end of the lever is hinged to the top of the contact rod, the other end of the bellows-type hot-pressing airbag is fixedly connected to the bottom of the other end of the lever; the third connection port of the three-way exhaust pipe exhausts gas to the outside.

[0021] By adopting the above technical solution, the gas discharged from the high vacuum pump is diverted through the three-way connection structure of the three-way exhaust pipe. Part of the gas is discharged externally to relieve pressure, and part of the gas is introduced into the bellows hot-pressurization bladder. The expansion and contraction deformation of the bellows hot-pressurization bladder drives the lever to rotate. The lever slides along the drive port at the top of the main impregnation vessel through the abutment rod, precisely controlling the lifting and lowering position of the explosion-proof boiling baffle. The working state of the explosion-proof boiling baffle is automatically adjusted according to the vacuum operation conditions, effectively suppressing the boiling and splashing of the impregnation liquid during vacuum pumping. The entire structure relies on the exhaust potential energy of the vacuum pump to achieve passive linkage. It has a compact structure, strong synchronization of action, and greatly improves the intelligence and energy efficiency of the equipment.

[0022] Preferably, a pump assembly is provided on one side of the main impregnation vessel. The pump assembly includes a cylinder, a piston rod, a first hose, a second hose, and a replenishment tank. The cylinder is fixedly disposed on one side of the main impregnation vessel. One end of the piston rod is slidably disposed within the cylinder, and the other end of the piston rod is hinged to the other end of the lever. A suction port is provided at the bottom of the cylinder, and a first one-way valve is provided inside the suction port. The suction port is connected to the replenishment tank through the first hose. An outlet is provided on one side of the cylinder, and a second one-way valve is provided inside the outlet. The outlet is connected to the drug storage tank through the second hose.

[0023] By adopting the above technical solution, the pump assembly relies on the lever swing power to drive the piston rod to slide back and forth in the cylinder. With the unidirectional conduction of the first and second one-way valves, the medium inside the replenishment tank is drawn through the first hose and then automatically replenished to the storage tank through the second hose. According to the vacuum linkage condition of the equipment, periodic automatic replenishment is realized, which compensates for the loss of medicine in the impregnation process in real time, maintains the stability of the medicine in the storage tank, ensures the constant impregnation process parameters, and significantly improves the continuous automated operation capability and process stability of the equipment.

[0024] Preferably, the pressurization unit includes an air compressor unit, a pressure regulating valve, and a pressurization pipeline; the output end of the air compressor unit is connected to the input end of the pressure regulating valve, and the output end of the pressure regulating valve is connected to the pressurization port at the top of the main impregnation tank through the pressurization pipeline.

[0025] By adopting the above technical solution, a stable high-pressure air source is provided by an air compressor unit, and the compressed gas is precisely stabilized and regulated by a pressure regulating valve to ensure that the output gas pressure matches the workpiece sealing process requirements. The stabilized compressed gas is evenly introduced into the main impregnation tank through pressurized pipes and pressurized gas ports, so that a stable high-pressure environment is formed inside the tank. The high pressure can force the impregnation liquid to fully fill the tiny pores of the powder metallurgy tool steel workpiece, effectively improving the workpiece sealing density, sealing performance and product quality. At the same time, the pressure is controllable and adjustable, adapting to the sealing processing requirements of workpieces of different specifications, and the equipment has strong versatility.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The system utilizes a storage tank for centralized storage of the impregnation solution, and a supply pump, main supply pipeline, and injection port to achieve automated and precise injection. A hydraulic distributor connected in series in the middle of the main supply pipeline diverts the hydraulic medium for output. One path, via a drive hose passing through a hose-sealed flange, provides hydraulic power to the compensation bladder, enabling adaptive compensation for workpiece immersion and ensuring uniform impregnation. The other path, via a hydraulic pressure guide pipe, provides driving power to the slag discharge assembly, linking the supply and discharge actions. A switching valve inside the discharge port, in conjunction with the discharge pipeline, ensures stable return and recycling of the impregnation solution after the impregnation operation, effectively reducing impregnation solution loss and improving the automation level and solution utilization rate of the equipment.

[0027] 2. The three-way connection structure of the three-way exhaust pipe diverts the gas discharged from the high vacuum pump. Part of the gas is discharged externally to relieve pressure, and part of the gas is introduced into the bellows hot-pressurization bladder. The expansion and contraction deformation of the bellows hot-pressurization bladder drives the lever to rotate. The lever slides along the drive port at the top of the main impregnation vessel through the abutment rod, precisely controlling the lifting and lowering position of the explosion-proof boiling baffle. The working state of the explosion-proof boiling baffle is automatically adjusted according to the vacuum operation conditions, effectively suppressing the boiling and splashing of the impregnation liquid during vacuum pumping. The entire structure relies on the exhaust potential energy of the vacuum pump to achieve passive linkage. It has a compact structure, strong synchronization of action, and greatly improves the intelligence and energy efficiency of the equipment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure in the embodiment.

[0029] Figure 2 This is a cross-sectional schematic diagram of the internal structure of the main impregnation vessel in the embodiment.

[0030] Figure 3 This is a schematic diagram of the liquid supply unit in the embodiment.

[0031] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0032] Figure 5 This is a cross-sectional schematic diagram of the internal structure of the liquid supply unit and the filter return pump structure in the embodiment.

[0033] Figure 6 This is a schematic diagram of the structure of the vacuum extraction unit and the vacuum extraction unit in the embodiment.

[0034] Figure 7 This is a cross-sectional schematic diagram of the internal structure of the cylinder in the embodiment.

[0035] Explanation of reference numerals in the attached drawings: 1. Main impregnation vessel; 11. Injection port; 12. Exhaust and pressure relief valve; 13. Vacuum extraction port; 14. Pressurized air port; 15. Drain port; 16. Hose threading sealing flange; 17. Workpiece lifting basket; 18. Compensation bladder; 19. Explosion-proof boiling baffle; 2. Vacuum extraction unit; 21. High vacuum pump; 22. Main vacuum pipeline; 23. Drive assembly; 231. Corrugated pipe hot pressurization bladder; 232. Three-way exhaust pipe; 233. Lever; 234. Abutment rod; 3. Liquid supply unit; 31. Chemical storage tank; 311. Slag discharge port; 312. Scraping structure; 3121. Drive rod; 3122. Slider; 3123. Connecting rod; 3124. Rotating shaft; 3125. Support rod; 3126. Scraper; 3127. Crank; 32. Liquid supply pump; 33. Liquid supply main pipeline; 34. Liquid discharge pipeline; 35. Hydraulic distributor; 351. Drive hose; 352. Hydraulic pressure guide pipe; 36. Slag discharge assembly; 361. Slag discharge hydraulic cylinder; 362. Unlocking plate; 363. Slag discharge flap; 4. Pressurization unit; 41. Air compressor unit; 42. Pressure regulating valve; 43. Pressurization pipeline; 5. Pump-liquid assembly; 51. Cylinder body; 511. Suction port; 5111. First check valve; 512. Liquid outlet; 5121. Second check valve; 52. Piston rod; 53. First hose; 54. Second hose; 55. Liquid replenishment tank; 6. Fixed support frame; 7. Filter return pump structure; 71. Leakage tank; 72. Return pump; 73. Filter screen. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0037] This application discloses a processing equipment for sealing pores in powder metallurgy products. (Refer to...) Figures 1 to 7 The system includes a main impregnation vessel 1, a vacuum extraction unit 2, a liquid supply unit 3, and a pressurization unit 4. The top of the main impregnation vessel 1 is sequentially equipped with a liquid injection port 11, an exhaust and pressure relief valve 12, a vacuum extraction port 13, and a pressurization port 14. The bottom of the main impregnation vessel 1 is equipped with a drain port 15 and a hose threading sealing flange 16. A workpiece basket 17 for accommodating powder metallurgy tool steel workpieces is slidably installed inside the main impregnation vessel 1, and a compensation bladder 18 is installed at the bottom of the workpiece basket 17. A longitudinally sliding structure is installed in the upper part of the inner cavity of the main impregnation vessel 1. It has an explosion-proof boiling baffle 19; a vacuum extraction unit 2 is connected to a vacuum extraction port 13; a liquid supply unit 3 is connected to the liquid injection port 11 at the top of the main impregnation vessel 1 and the liquid discharge port 15 at the bottom of the main impregnation vessel 1 respectively; a pressurization unit 4 is connected to a pressurization port 14; the bottom of the workpiece basket 17 is a breathable grid; a fixed support frame 6 is provided below the compensation bladder 18; the fixed support frame 6 is fixedly installed on the inner wall of the bottom of the main impregnation vessel 1, and the compensation bladder 18 abuts against the fixed support frame 6; the explosion-proof boiling baffle 19 is a porous sieve plate structure.

[0038] The powder metallurgy tool steel workpiece is placed inside the workpiece basket 17, with a permeable grid at the bottom of the workpiece basket 17 allowing the impregnation liquid to circulate. The workpiece basket 17, loaded with the workpiece, is slid into the main impregnation vessel 1 and positioned above the compensation bladder 18. The compensation bladder 18 supports the workpiece basket 17 and is supported by a fixed support frame 6 installed on the inner wall of the bottom of the main impregnation vessel 1, completing the workpiece loading and positioning. The vacuum extraction unit 2 is activated, and the vacuum extraction unit 2 extracts the gas inside the main impregnation vessel 1 through the vacuum extraction port 13, allowing the main impregnation liquid to flow smoothly. A negative pressure environment is created inside the impregnation tank 1. Then, the liquid supply unit 3 is activated, supplying impregnation liquid into the main impregnation tank 1 through the injection port 11. After entering the main impregnation tank 1, the impregnation liquid wets the powder metallurgy tool steel workpiece in the workpiece basket 17, penetrating into the workpiece pores. During the impregnation process, a medium can be introduced into the compensation bladder 18, causing it to expand and lift the workpiece basket 17, continuously adjusting the workpiece's immersion state in the impregnation liquid and maintaining the immersion conditions. A longitudinal sliding device is installed in the upper part of the inner cavity of the main impregnation tank 1. The porous sieve plate structure anti-boiling baffle 19 can be moved down to the area above the impregnation liquid surface. When the pressure inside the main impregnation tank 1 changes and bubbles are generated in the impregnation liquid, it breaks up the bubbles, preventing the impregnation liquid from boiling and splashing under vacuum negative pressure conditions. After the liquid injection is completed, the pressurization unit 4 is activated. The pressurization unit 4 introduces a pressure medium into the main impregnation tank 1 through the pressurization port 14, increasing the pressure inside the main impregnation tank 1. Under the action of pressure, the impregnation liquid further penetrates into the micropores of the powder metallurgy tool steel workpiece. The exhaust pressure relief valve 1... 2. Monitor the internal pressure of the main impregnation tank 1 in real time. When the pressure inside the tank exceeds the set threshold, pressure relief protection is implemented. After the impregnation process is completed, open the drain port 15 at the bottom of the main impregnation tank 1. With the pressure generated by the pressurization unit 4, the impregnation liquid in the main impregnation tank 1 flows back to the liquid supply unit 3 through the drain port 15 to complete the recycling. After the impregnation liquid is drained, release the internal pressure of the main impregnation tank 1. The workpiece basket 17 slides upward along the main impregnation tank 1 to take out the powder metallurgy tool steel workpiece that has completed the impregnation treatment. All structures are reset and ready for the next round of operation.

[0039] Reference Figures 1 to 7 The pressurization unit 4 includes an air compressor unit 41, a pressure regulating valve 42, and a pressurization pipeline 43. The output end of the air compressor unit 41 is connected to the input end of the pressure regulating valve 42, and the output end of the pressure regulating valve 42 is connected to the pressurization port 14 at the top of the main impregnation tank 1 through the pressurization pipeline 43. When the pressurization unit 4 is working, the air compressor unit 41 is started, and the compressed gas output by the air compressor unit 41 is delivered to the input end of the pressure regulating valve 42. The pressure regulating valve 42 regulates and stabilizes the pressure of the compressed gas to reach the process set pressure. The stabilized compressed gas flows out from the output end of the pressure regulating valve 42, is delivered to the pressurization port 14 at the top of the main impregnation tank 1 through the pressurization pipeline 43, and finally enters the interior of the main impregnation tank 1, creating a high-pressure environment inside the main impregnation tank 1. The high pressure is used to promote the impregnation liquid to fully penetrate into the micropores of the powder metallurgy tool steel workpiece, completing the pressurized impregnation operation.

[0040] Reference Figures 1 to 7 The liquid supply unit 3 includes a storage tank 31, a liquid supply pump 32, a main liquid supply pipeline 33, a drain pipeline 34, a hydraulic distributor 35, a hydraulic pressure guide pipe 352, and a slag discharge assembly 36. The liquid supply pump 32 is located at the outlet end of the storage tank 31, and the outlet end of the storage tank 31 is connected to the inlet end of the main liquid supply pipeline 33 through the liquid supply pump 32. The outlet end of the main liquid supply pipeline 33 is connected to the injection port 11. The hydraulic distributor 35 is connected in series in the middle section of the main liquid supply pipeline 33. The first branch of the hydraulic distributor 35... A drive hose 351 is provided on the outlet, and the hydraulic diverter 35 passes through the drive hose 351 and the hose thread sealing flange 16 to communicate with the compensation bladder 18; a hydraulic pressure guide pipe 352 is provided on the second diversion port of the hydraulic diverter 35, and the second diversion port of the hydraulic diverter 35 is connected to the slag discharge assembly 36 through the hydraulic pressure guide pipe 352; a switch valve is provided in the discharge port 15, one end of the discharge pipe 34 is connected to the discharge port 15, and the other end of the discharge pipe 34 is connected to the medicine storage tank 31.

[0041] When the liquid supply unit 3 is working, the storage tank 31 is used to store the impregnation working solution. After the liquid supply pump 32 at the outlet of the storage tank 31 is started, the working solution inside the storage tank 31 is pumped into the main liquid supply pipeline 33, so that the working solution is transported along the main liquid supply pipeline 33 to the injection port 11 at the top of the main impregnation vessel 1, thereby completing the automatic liquid injection operation into the main impregnation vessel 1. The hydraulic distributor 35 connected in series in the middle section of the main liquid supply pipeline 33 divides and stabilizes the working solution flowing in the pipeline. The working solution at the first diversion port of the hydraulic distributor 35 is transported through the drive hose 351, which passes through... The hose at the bottom of the main impregnation vessel 1 is threaded through the sealing flange 16 and connected to the compensation bladder 18. The pressure of the hydraulic medium enables the compensation bladder 18 to be pressurized and expanded and to perform adaptive support and compensation actions. The working fluid at the second branch port of the hydraulic distributor 35 is transported to the slag discharge assembly 36 via the hydraulic pressure guide pipe 352, providing hydraulic drive power for the start and stop of the slag discharge assembly 36. After the impregnation process is completed, the switch valve inside the drain port 15 of the main impregnation vessel 1 is opened, and the working fluid inside the main impregnation vessel 1 can flow back to the storage tank 31 through the drain pipe 34, realizing the recycling and reuse of the working fluid.

[0042] Reference Figures 1 to 7The slag discharge assembly 36 includes a slag discharge hydraulic cylinder 361, an unlocking plate 362, and a slag discharge flap 363. The slag discharge hydraulic cylinder 361 is fixed to the outer side of the bottom of the medicine storage tank 31. The rodless chamber of the slag discharge hydraulic cylinder 361 is connected to the hydraulic pressure guide pipe 352. A slag discharge port 311 is provided at the bottom of the medicine storage tank 31. One end of the slag discharge flap 363 is rotatably connected to one side of the slag discharge port 311. A torsion spring is provided at the connection between the slag discharge flap 363 and the slag discharge port 311. A sealing ring is provided on the upper surface of the slag discharge flap 363. One end of the unlocking plate 362 is slidably disposed at the bottom of the medicine storage tank 31 on one side of the slag discharge port 311. The other end of the unlocking plate 362 abuts against the lower surface of the slag discharge flap 363. The side of the push rod end of the slag discharge hydraulic cylinder 361 is fixedly connected to one side of the unlocking plate 362.

[0043] When the hydraulic pressure guide pipe 352 delivers pressure medium to the rodless chamber of the slag discharge hydraulic cylinder 361, the push rod of the slag discharge hydraulic cylinder 361 extends outward. The push rod of the slag discharge hydraulic cylinder 361 drives the unlocking plate 362, which is fixedly connected to it, to slide at the bottom of the storage tank 31. The unlocking plate 362 slides to the hinge point between the slag discharge flap 363 and the slag discharge port 311. At this time, the slag discharge flap 363 flips downward under the force of the torsion spring, and the slag discharge port 311 at the bottom of the storage tank 31 opens, and the storage tank... The waste residue deposited inside 31 can be discharged outward through the slag discharge port 311; as the liquid supply pump 32 stops, the push rod end of the slag discharge hydraulic cylinder 361 is fitted with a reset spring, which resets the push rod end of the slag discharge hydraulic cylinder 361 to the retracted state. The unlocking plate 362 resets and abuts against the slag discharge flap 363, flipping upward to close the slag discharge port 311. The sealing ring on the upper surface of the slag discharge flap 363 presses tightly against the slag discharge port 311 to achieve a seal and prevent leakage of the impregnating liquid.

[0044] Reference Figures 1 to 7 The medicine storage tank 31 is equipped with a scraping structure 312, which includes a drive rod 3121, a slider 3122, a connecting rod 3123, a rotating shaft 3124, a support rod 3125, and a scraper 3126. A rotating sealing sleeve is provided at the center of the top of the medicine storage tank 31, and the rotating shaft 3124 passes through the rotating sealing sleeve and is rotatably connected to the medicine storage tank 31. The slider 3122 is slidably disposed on the top of the medicine storage tank 31, and a curved section is fixedly provided at one end of the rotating shaft 3124. The crank 3127 has one end rotatably mounted on one end of the crank 3127, and the other end rotatably mounted on the slider 3122. One end of the support rod 3125 is fixedly mounted on the other end of the rotating shaft 3124, and the scraper 3126 is fixedly mounted on the other end of the support rod 3125. The scraper 3126 abuts against the inner wall of the storage tank 31. One end of the drive rod 3121 is fixedly mounted on the slider 3122, and the other end of the drive rod 3121 is fixedly connected to the push rod end of the slag discharge hydraulic cylinder 361.

[0045] When the push rod end of the slag discharge hydraulic cylinder 361 extends or retracts, it drives the drive rod 3121 to move synchronously. The drive rod 3121 pulls the slider 3122 to slide on the top of the medicine storage tank 31. The slider 3122 drives the crank 3127 to rotate through the connecting rod 3123. The crank 3127 is fixed to the end of the rotating shaft 3124, thereby driving the rotating shaft 3124 to rotate relative to the medicine storage tank 31 by means of the rotating sealing sleeve. The other end of the rotating shaft 3124 is fixedly connected to the support rod 312. 5. The support rod 3125 rotates together with the rotating shaft 3124, driving the scraper 3126, which abuts against the inner wall of the medicine storage tank 31, to move circumferentially along the inner wall of the medicine storage tank 31. The scraper 3126 continuously scrapes away the solid deposits adhering to the inner wall of the medicine storage tank 31. The rotating sealing sleeve achieves a dynamic seal at the position where the rotating shaft 3124 passes through the medicine storage tank 31, preventing the internal impregnating liquid of the medicine storage tank 31 from leaking outward, thus completing the continuous scraping of the inner wall of the medicine storage tank 31. The scraped solid deposits are discharged through the slag discharge port 311.

[0046] Reference Figures 1 to 7 A filter return pump structure 7 is installed at the slag discharge port 311. The filter return pump structure 7 includes a water leakage trough 71 and a return pump 72. One end of the water leakage trough 71 is located below the slag discharge port 311, and the water leakage trough 71 is fixedly connected to the bottom of the medicine storage tank 31. A filter screen 73 is installed inside the water leakage trough 71. One end of the return pump 72 is connected to the other end of the water leakage trough 71, and the other end of the return pump 72 is connected to the medicine storage tank 31. When the slag discharge port 311 at the bottom of the medicine storage tank 31 is opened to discharge slag, water flows from the slag discharge port 311... 11 The falling solid-liquid mixture falls directly into the drain trough 71 fixedly connected to the bottom of the storage tank 31. The filter screen 73 installed inside the drain trough 71 separates the solid and liquid materials. The filter screen 73 intercepts solid impurities such as waste residue. The clean leachate after being filtered by the filter screen 73 is transported to the return pump 72 through the pipeline. After the return pump 72 is started, it transports the filtered leachate back into the storage tank 31, realizing the filtration, recovery and recycling of leachate, and effectively preventing the leachate from being lost with the waste residue.

[0047] Reference Figures 1 to 7The vacuum extraction unit 2 includes a high vacuum pump 21 and a main vacuum pipeline 22; the high vacuum pump 21 is connected to the vacuum extraction port 13 through the main vacuum pipeline 22; a drive assembly 23 is provided at the exhaust port of the high vacuum pump 21; the drive assembly 23 includes a bellows thermocompression airbag 231, a three-way exhaust pipe 232, a lever 233, and a contact rod 234; the first connection port of the three-way exhaust pipe 232 is connected to the exhaust port of the high vacuum pump 21, and the second connection port of the three-way exhaust pipe 232 is connected to the bellows thermocompression airbag 231. One end of the corrugated pipe hot-press airbag 231 is fixedly mounted on the main impregnation vessel 1. A drive port is provided at the center of the top of the main impregnation vessel 1. The abutment rod 234 is slidably mounted in the drive port. The bottom of the abutment rod 234 abuts against the anti-explosion boiling baffle 19. The lever 233 is rotatably mounted on the top of the main impregnation vessel 1. One end of the lever 233 is hinged to the top of the abutment rod 234. The other end of the corrugated pipe hot-press airbag 231 is fixedly connected to the bottom of the other end of the lever 233. The third connection port of the three-way exhaust pipe 232 exhausts to the outside.

[0048] The high-vacuum pump 21 of the vacuum extraction unit 2 is started. The high-vacuum pump 21, in conjunction with the vacuum extraction port 13 via the main vacuum pipeline 22, extracts the gas inside the main impregnation vessel 1, creating a negative pressure environment inside the main impregnation vessel 1. The exhaust gas generated by the high-vacuum pump 21 enters the three-way exhaust pipe 232. The first connection port of the three-way exhaust pipe 232 receives the exhaust gas, and part of the gas is directly discharged outward through the third connection port of the three-way exhaust pipe 232. The other part of the gas is introduced into the bellows thermocompression bladder 231 through the second connection port of the three-way exhaust pipe 232. The bellows thermocompression bladder 231 expands under the action of the gas. One end of the bellows thermocompression bladder 231 is fixed to... After the main impregnation vessel 1 expands, it pushes the other end of the lever 233 upward, causing the lever 233 to rotate around its installation position. One end of the lever 233 is hinged to drive the abutment rod 234 to slide downward along the top drive port of the main impregnation vessel 1. The bottom of the abutment rod 234 pushes the explosion-proof boiling baffle 19, which it abuts against, to move downward. When the high vacuum pump 21 stops working and the exhaust supply is interrupted, the bellows hot pressure bladder 231 contracts and resets, pulling the lever 233 to rotate in the opposite direction. The lever 233 drives the abutment rod 234 to move upward, releasing the downward pressure on the explosion-proof boiling baffle 19. Under the action of the liquid in the main impregnation vessel 1, the explosion-proof boiling baffle 19 will float upward and reset.

[0049] Reference Figures 1 to 7A pump assembly 5 is provided on one side of the main impregnation vessel 1. The pump assembly 5 includes a cylinder 51, a piston rod 52, a first hose 53, a second hose 54, and a replenishment tank 55. The cylinder 51 is fixedly installed on one side of the main impregnation vessel 1. One end of the piston rod 52 is slidably installed inside the cylinder 51, and the other end of the piston rod 52 is hinged to the other end of the lever 233. A suction port 511 is provided at the bottom of the cylinder 51. A first one-way valve 5111 is installed inside the suction port 511. The suction port 511 is connected to the first hose 54. Pipe 53 is connected to replenishment tank 55; a liquid outlet 512 is provided on one side of cylinder 51, and a second one-way valve 5121 is provided inside the liquid outlet 512. The liquid outlet 512 is connected to the medicine storage tank 31 through the second hose 54; during the swinging process of lever 233 driven by bellows hot pressure air bag 231, piston rod 52 hinged to the other end of lever 233 slides back and forth. Piston rod 52 moves back and forth inside cylinder 51 fixed to one side of main impregnation vessel 1, changing the internal volume of cylinder 51. When the piston rod 52 moves upward to expand the volume, a negative pressure is formed inside the cylinder 51. The first one-way valve 5111 in the suction port 511 opens, and the second one-way valve 5121 in the outlet port 512 closes. The replenishing medium inside the replenishing tank 55 is drawn into the cylinder 51 through the first hose 53 and the suction port 511, completing the suction action. When the piston rod 52 moves downward to compress the volume of the cylinder 51, the pressure inside the cylinder 51 increases. The first one-way valve 5111 closes, and the second one-way valve 5121 opens. The replenishing medium inside the cylinder 51 is expelled through the outlet port 512 and the second hose 54 and transported to the medicine storage tank 31, completing the automatic replenishment operation.

[0050] The working principle of the powder metallurgy product sealing process equipment in this application is as follows: The powder metallurgy tool steel workpiece is placed in the workpiece basket 17 and sent into the main impregnation tank 1. The vacuum extraction unit 2 is started to extract the gas inside the main impregnation tank 1 to create a negative pressure environment. During the operation of the vacuum extraction unit 2, the high vacuum pump 21 discharges gas into the bellows hot pressure air bag 231 to make it expand. The driving lever 233 drives the abutment rod 234 to move down and push the anti-boiling baffle 19 down to suppress the boiling of the impregnation liquid. Then the liquid supply unit 3 is started. The impregnation liquid in the storage tank 31 is transported to the main impregnation tank 1 by the liquid supply pump 32 to complete the liquid injection. The hydraulic diverter 35 diverts the medium. One path is filled into the compensation bag 18 to make it expand and lift the workpiece basket 17 to continuously ensure the workpiece is submerged. The other path is transported to the slag discharge hydraulic cylinder 361, which pushes the unlocking plate 362 to slide and release the limit on the slag discharge flap 363. The slag discharge hydraulic cylinder 361's push rod extends and retracts synchronously, driving the drive rod 3121 to drive the slider 3122, connecting rod 3123, and crank 3127, which in turn drive the rotating shaft 3124, support rod 3125, and scraper 3126 to rotate, continuously scraping away the deposits on the inner wall of the storage tank 31. After the liquid injection is completed, the pressurization unit 4 is started, and the air compressor unit 41 outputs gas, which is then regulated by the pressure regulating valve 42 and introduced into the main impregnation vessel 1, increasing the pressure inside the vessel and causing the impregnation liquid to penetrate into the micropores of the workpiece. After impregnation is completed, the drain port 15 switch valve is opened, and the impregnation liquid flows back to the storage tank 31; after the liquid supply pump 32 stops, the slag discharge hydraulic cylinder 361 is depressurized, and the slag discharge flap 363 opens under the action of the torsion spring, and the waste slag falls into the drain tank 71. The filter screen 73 achieves solid-liquid separation, and the return pump 72 sends the filtrate back to the storage tank 31. The lever 233 reciprocates and swings, simultaneously driving the piston rod 52 to reciprocate within the cylinder 51. This, in conjunction with the first one-way valve 5111 and the second one-way valve 5121, enables the replenishment tank 55 to periodically replenish the medicine storage tank 31. After the vacuum pump stops, the bellows hot-pressurization airbag 231 contracts, the explosion-proof boiling baffle 19 floats up and resets, and after depressurization, the workpiece basket 17 is lifted out, completing a single impregnation process.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A processing device for sealing pores in powder metallurgy products, characterized in that: The system includes a main impregnation vessel (1), a vacuum extraction unit (2), a liquid supply unit (3), and a pressurization unit (4). The top of the main impregnation vessel (1) is sequentially equipped with a liquid injection port (11), an exhaust and pressure relief valve (12), a vacuum extraction port (13), and a pressurization port (14). The bottom of the main impregnation vessel (1) is equipped with a drain port (15) and a hose threading sealing flange (16). A workpiece basket for accommodating powder metallurgy tool steel workpieces is slidably installed inside the main impregnation vessel (1). 17) The bottom of the workpiece basket (17) is provided with a compensation bladder (18); the upper part of the inner cavity of the main impregnation vessel (1) is provided with an anti-boiling baffle (19); the vacuum extraction unit (2) is connected to the vacuum extraction port (13); the liquid supply unit (3) is connected to the liquid injection port (11) at the top of the main impregnation vessel (1) and the liquid discharge port (15) at the bottom of the main impregnation vessel (1); the pressurization unit (4) is connected to the pressurization port (14).

2. The processing equipment for sealing powder metallurgy products according to claim 1, characterized in that: The bottom of the workpiece basket (17) is a breathable grid; a fixed support frame (6) is provided below the compensation bladder (18); the fixed support frame (6) is fixedly installed on the inner wall of the bottom of the main impregnation tank (1), and the compensation bladder (18) abuts against the fixed support frame (6); the explosion-proof baffle (19) is a porous sieve plate structure.

3. The processing equipment for sealing powder metallurgy products according to claim 1, characterized in that: The liquid supply unit (3) includes a medicine storage tank (31), a liquid supply pump (32), a main liquid supply pipeline (33), a drain pipeline (34), a hydraulic distributor (35), and a slag removal assembly (36). The liquid supply pump (32) is located at the outlet end of the medicine storage tank (31), and the outlet end of the medicine storage tank (31) is connected to the inlet end of the main liquid supply pipeline (33) through the liquid supply pump (32). The outlet end of the main liquid supply pipeline (33) is connected to the injection port (11). The hydraulic distributor (35) is connected in series in the middle section of the main liquid supply pipeline (33). A drive is provided on the first branch port of the hydraulic distributor (35). The hydraulic diverter (35) is connected to the compensating bladder (18) via the drive hose (351) through the hose thread sealing flange (16); a hydraulic pressure guide pipe (352) is provided on the second diversion port of the hydraulic diverter (35), and the second diversion port of the hydraulic diverter (35) is connected to the slag discharge assembly (36) via the hydraulic pressure guide pipe (352); a switch valve is provided in the drain port (15), one end of the drain pipe (34) is connected to the drain port (15), and the other end of the drain pipe (34) is connected to the medicine storage tank (31).

4. The processing equipment for sealing pores in powder metallurgy products according to claim 3, characterized in that: The slag discharge assembly (36) includes a slag discharge hydraulic cylinder (361), an unlocking plate (362), and a slag discharge flap (363); the slag discharge hydraulic cylinder (361) is fixed to the outside of the bottom of the medicine storage tank (31); the rodless chamber of the slag discharge hydraulic cylinder (361) is connected to the hydraulic pressure guide pipe (352); a slag discharge port (311) is opened at the bottom of the medicine storage tank (31), one end of the slag discharge flap (363) is rotatably connected to one side of the slag discharge port (311), and the slag discharge flap (363) is connected to the... A torsion spring is provided at the connection of the slag discharge port (311); a sealing ring is provided on the upper surface of the slag discharge flap (363); one end of the unlocking plate (362) is slidably disposed at the bottom of the medicine storage tank (31) on one side of the slag discharge port (311), and the other end of the unlocking plate (362) abuts against the lower surface of the slag discharge flap (363); the side of the push rod end of the slag discharge hydraulic cylinder (361) is fixedly connected to one side of the unlocking plate (362); a return spring is sleeved on the push rod end of the slag discharge hydraulic cylinder (361).

5. The processing equipment for sealing pores in powder metallurgy products according to claim 4, characterized in that: The medicine storage tank (31) is provided with a scraping structure (312), which includes a drive rod (3121), a slider (3122), a connecting rod (3123), a rotating shaft (3124), a support rod (3125), and a scraper (3126). A rotating sealing sleeve is provided at the center of the top of the medicine storage tank (31), and the rotating shaft (3124) passes through the rotating sealing sleeve and is rotatably connected to the medicine storage tank (31). The slider (3122) is slidably disposed on the top of the medicine storage tank (31); one end of the rotating shaft (3124) is fixedly disposed on a crank (3127); one end of the connecting rod (3123) is rotatably disposed on one end of the crank (3127), and the other end of the connecting rod (3123) is rotatably disposed on the slider (3122); one end of the support rod (3125) is fixedly disposed on the other end of the rotating shaft (3124), and the scraper (3126) is fixedly disposed on the other end of the support rod (3125); the scraper (3126) abuts against the inner wall of the medicine storage tank (31); one end of the drive rod (3121) is fixedly disposed on the slider (3122), and the other end of the drive rod (3121) is fixedly connected to the push rod end of the slag discharge hydraulic cylinder (361).

6. The processing equipment for sealing pores in powder metallurgy products according to claim 4, characterized in that: A filter return pump structure (7) is provided at the slag discharge port (311). The filter return pump structure (7) includes a water leakage trough (71) and a return pump (72). One end of the water leakage trough (71) is located below the slag discharge port (311). The water leakage trough (71) is fixedly connected to the bottom of the medicine storage tank (31). A filter screen (73) is provided inside the water leakage trough (71). One end of the return pump (72) is connected to the other end of the water leakage trough (71), and the other end of the return pump (72) is connected to the medicine storage tank (31).

7. The processing equipment for sealing pores in powder metallurgy products according to claim 3, characterized in that: The vacuum extraction unit (2) includes a high vacuum pump (21) and a main vacuum pipeline (22); the high vacuum pump (21) is connected to the vacuum extraction port (13) through the main vacuum pipeline (22); a drive component (23) is provided at the exhaust port of the high vacuum pump (21).

8. The processing equipment for sealing pores in powder metallurgy products according to claim 7, characterized in that: The drive assembly (23) includes a bellows hot-pressing airbag (231), a three-way exhaust pipe (232), a lever (233), and an abutment rod (234); the first connection port of the three-way exhaust pipe (232) is connected to the exhaust port of the high vacuum pump (21), and the second connection port of the three-way exhaust pipe (232) is connected to the bellows hot-pressing airbag (231). One end of the bellows hot-pressing airbag (231) is fixedly mounted on the main impregnation vessel (1), and the center position of the top of the main impregnation vessel (1) is set with A drive port is provided, and the abutment rod (234) is slidably disposed in the drive port. The bottom of the abutment rod (234) abuts against the anti-explosion boiling baffle (19). The lever (233) is rotatably disposed on the top of the main impregnation tank (1). One end of the lever (233) is hinged to the top of the abutment rod (234), and the other end of the bellows hot press air bag (231) is fixedly connected to the bottom of the other end of the lever (233). The third connection port of the three-way exhaust pipe (232) exhausts to the outside.

9. The processing equipment for sealing pores in powder metallurgy products according to claim 8, characterized in that: A pump assembly (5) is provided on one side of the main impregnation vessel (1). The pump assembly (5) includes a cylinder (51), a piston rod (52), a first hose (53), a second hose (54), and a replenishment tank (55). The cylinder (51) is fixedly disposed on one side of the main impregnation vessel (1). One end of the piston rod (52) is slidably disposed within the cylinder (51), and the other end of the piston rod (52) is hinged to the other end of the lever (233). The bottom of the body (51) is provided with a liquid suction port (511), and a first one-way valve (5111) is provided inside the liquid suction port (511). The liquid suction port (511) is connected to the replenishment tank (55) through a first hose (53). A liquid outlet (512) is provided on one side of the cylinder body (51), and a second one-way valve (5121) is provided inside the liquid outlet (512). The liquid outlet (512) is connected to the medicine storage tank (31) through a second hose (54).

10. The processing equipment for sealing pores in powder metallurgy products according to claim 1, characterized in that: The pressurization unit (4) includes an air compressor unit (41), a pressure regulating valve (42), and a pressurization pipeline (43); the output end of the air compressor unit (41) is connected to the input end of the pressure regulating valve (42), and the output end of the pressure regulating valve (42) is connected to the pressurization port (14) at the top of the main impregnation tank (1) through the pressurization pipeline (43).

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