Heat treatment device and method for ZL205A alloy casting

Abstract

The invention discloses a ZL205A alloy casting heat treatment device which comprises a base, two supports, a mounting base, an oil storage tank, a heat treatment reaction kettle, an oil pump and an oil inlet pipe, the two supports are arranged in the middles of the front side and the rear side of the top of the base correspondingly, the mounting base is arranged on the right sides of the two supports, and the oil storage tank is fixedly mounted at the right end of the top of the base; the heat treatment reaction kettle is fixedly mounted at the top of the mounting seat; the oil pump is arranged at the bottom of the right side of the oil storage tank. Only one oil pump is needed for driving, other processes are completed through the gravity of oil liquid, an oil way is simple and easy to maintain, the working difficulty of operators is small, a large number of bubbles, water and impurities contained in the oil liquid subjected to heat treatment can be filtered and separated, manual maintenance and cleaning are not needed, the working efficiency is high, and the cost is low. And the workload of operators is reduced, and automatic production is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, and in particular to a ZL205A alloy casting heat treatment device and method. Background Art

[0002] In the field of metal processing, heat treatment of alloy castings is one of the indispensable process links to improve product performance. Through proper heating, insulation and cooling, the mechanical properties of casting alloys such as ZL205A can be significantly improved, stress can be eliminated and the organizational structure can be optimized. Traditional heat treatment devices and methods have certain limitations and inconveniences in the operation process, especially when it involves high precision and repeatability requirements.

[0003] First of all, most traditional heat treatment methods are manually operated, which is not only inefficient, but also often leads to inconsistent processing results due to the instability of manual operation, making it difficult to achieve the precise temperature and time control requirements of the process. In addition, oil management during the heat treatment process is also a technical challenge. Since the oil needs to be replaced and cleaned regularly, how to quickly and effectively discharge the used oil and separate it for recycling is a key factor in improving production efficiency and reducing costs.

[0004] Secondly, the treatment of the casting surface during traditional heat treatment is often not ideal. Because the oil may contain impurities and gases, unfiltered and undegassed oil can have a negative impact on the surface quality of the casting, such as pores and inclusions on the surface. These problems may lead to reduced strength and shortened life of the casting, which has a significant impact on the performance of the final product.

[0005] In view of the above problems, there is an urgent need for an automatic heat treatment device with efficient cleaning and separation mechanism to achieve fine control and automatic operation of the heat treatment process of ZL205A alloy castings. In this way, the quality and consistency of heat treatment can be effectively improved, the uncertainty caused by manual operation can be reduced, and the operating cost can be reduced through efficient oil management. Summary of the invention

[0006] The object of the present invention is to provide a ZL205A alloy casting heat treatment device to at least solve the problems of the prior art that the oil circuit is complicated and difficult to maintain and the oil impurities cannot be filtered.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a ZL205A alloy casting heat treatment device, comprising a base, two brackets, a mounting seat, an oil storage tank, a heat treatment reactor, an oil pump and an oil inlet pipe, wherein the two brackets are respectively arranged at the middle positions of the front and rear sides of the top of the base, the mounting seat is arranged on the right side of the two brackets, the oil storage tank is fixedly installed at the right end of the top of the base, the heat treatment reactor is fixedly installed on the top of the mounting seat, the oil pump is arranged at the right bottom of the oil storage tank, one end of the oil inlet pipe is installed at the top of the oil pump, and the other end is installed with the right bottom of the heat treatment reactor, and also includes: a recovery and filtering mechanism, which is arranged on the left side of the two brackets; an automatic kettle cover assembly, which is arranged on the top of the heat treatment reactor; a vacuum assembly, which is arranged at the left end of the top of the base; a controller, which is fixedly installed on the front side of the oil storage tank, and the heat treatment reactor, the recovery and filtering mechanism, the automatic kettle cover assembly, the oil pump and the vacuum assembly are all electrically connected to the controller;

[0008] The purpose is to recover the oil in the heat treatment reactor, discharge the bubbles in the oil, and separate the water and impurities, so that the oil can be reused. The recovery and filtering mechanism includes: a separation chamber, which is fixedly installed on the left side of the two brackets, and the bottom of the inner cavity of the separation chamber gradually tilts downward from the outside to the inside; a recovery component, which is arranged on the left side of the heat treatment reactor and is electrically connected to the controller; a separation component, which is arranged on the top of the separation chamber and is electrically connected to the controller; a drain pipe, which is arranged at the bottom of the separation chamber; a first solenoid valve, which is installed at the bottom end of the drain pipe and is electrically connected to the controller; a reflux pipe, one end of which is plugged into the bottom right end of the separation layer, and the other end is installed with the oil storage tank; a second solenoid valve, which is installed in the middle of the reflux pipe and is electrically connected to the controller.

[0009] Preferably, the purpose is to utilize the oil's own gravity and siphon effect to suck the oil in the heat treatment reactor into the separation bin, and the recovery component includes: a recovery pipe, which is plugged into the middle position of the left side of the heat treatment reactor, one end of the recovery pipe extends to the bottom of the heat treatment reactor, and the other end is inserted into the inner cavity of the separation bin; a third solenoid valve is installed in the middle of the recovery pipe and is electrically connected to the controller.

[0010] Preferably, the purpose is to make the water outlet extending to the bottom of the heat treatment reactor lower than the liquid level of the heat treatment reactor, so that the downward pressure on the liquid level at the water outlet is greater than the upward atmospheric pressure, thereby ensuring the stable outflow of oil, and the position of one end of the recovery pipe extending to the bottom of the heat treatment reactor is higher than the position of the other end.

[0011] Preferably, the purpose is to drive out the bubbles in the oil and collect and discharge the impurities in the filtered oil. The separation component includes: a motor, fixedly mounted on the top of the separation bin and electrically connected to the controller; a rotating shaft, fixedly mounted on the output end of the motor; a filter barrel, fixedly mounted on the right wall of the inner cavity of the separation bin, the filter barrel is located at the bottom of the recovery pipe, and the bottom of the inner cavity of the filter barrel gradually tilts downward from the outside to the inside; several scrapers are respectively circumferentially mounted on the bottom end of the rotating shaft, and several of the scrapers are in close contact with the inner wall of the filter barrel; a drain pipe, one end of which is mounted on the bottom of the filter barrel, and the other end extends to the outside of the separation bin; a fourth solenoid valve is arranged at the bottom end of the drain pipe and electrically connected to the controller.

[0012] Preferably, the side wall of the filter barrel is provided with numerous small holes.

[0013] Preferably, the automatic kettle cover assembly includes: two electric push rods, which are respectively fixedly installed on the front and rear sides of the heat treatment reactor and are electrically connected to the controller; a kettle cover, which is fixedly installed on the output ends of the two electric push rods; and a material storage mesh box, which is detachably installed on the bottom of the kettle cover.

[0014] Preferably, the purpose is to provide a stable vacuum environment in the heat treatment reactor so that the alloy castings can be heat treated in oil. The vacuum component includes: a vacuum pump, fixedly installed on the top left end of the base and electrically connected to the controller; an exhaust pipe, one end of which is installed on the front side of the vacuum pump and the other end is installed on the front top of the heat treatment reactor.

[0015] A method for using a ZL205A alloy casting heat treatment device comprises the following steps:

[0016] Step 1. Heat treatment process:

[0017] The lid of the kettle is raised, and the alloy casting is placed in the material storage net box. The oil is first placed in the heat treatment reactor for heating and treatment, and the heat treatment reactor is used to heat treat the alloy casting;

[0018] Step 2. Oil recovery:

[0019] After the heat treatment is completed, the third solenoid valve opens, and the oil flows into the separation chamber through the recovery pipe;

[0020] The recovery pipe is inserted into the bottom of the heat treatment reactor, and the oil is sucked out by the liquid's own weight and siphon phenomenon;

[0021] Step 3. Separation of impurities:

[0022] In the separation chamber, the oil flows through a filter barrel with a scraper;

[0023] The scraper driven by the motor moves along the shaft to help filter impurities and remove bubbles from the oil;

[0024] The pure oil is discharged through the small holes on the side wall of the filter barrel;

[0025] After the impurities are scraped onto the wall of the filter barrel, they are discharged through the sewage pipe and the connected fourth solenoid valve.

[0026] The invention provides a ZL205A alloy casting heat treatment device, which has the following beneficial effects:

[0027] 1. The present invention can quickly fill the inner cavity of the recovery pipe under the action of the oil's own gravity, and utilize the pressure difference at both ends of the oil column in the recovery pipe to make the oil rise and then flow into the lower separation bin. Since the oil at the pipe mouth of the recovery pipe is subjected to different atmospheric pressures, the oil will flow from the side with high pressure to the side with low pressure. The oil in the heat treatment reactor can be quickly extracted by the siphon phenomenon, and then the filtering, separation and reflux are completed by the oil's own gravity. The present invention only needs one oil pump for driving, and other processes are completed by the oil's own gravity. The oil circuit is simple and easy to maintain, and the operator's work is less difficult.

[0028] 2. The present invention allows oil to flow into the inner cavity of the filter barrel through a recovery pipe. After being filtered by the filter barrel, impurities remain on the inner cavity side wall of the filter barrel. The controller controls the motor to drive a plurality of scrapers to rotate, thereby scraping off the impurities remaining on the inner wall of the filter barrel and collecting them at the bottom of the filter barrel, ensuring that the filter barrel will not be blocked by debris. At the same time, the oil can drive out the bubbles in the oil through the small holes. The oil after heat treatment contains a large amount of bubbles, water and impurities, which can be filtered and separated without manual maintenance and cleaning. The work efficiency is high, the workload of the operator is reduced, and automatic production is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 It is the front view of the present invention;

[0031] Figure 3 It is a front cross-sectional view of the present invention;

[0032] Figure 4 This is the enlarged view of point A;

[0033] Figure 5 It is a schematic diagram of the separation component structure;

[0034] Figure 6 It is a left side view of the present invention;

[0035] Figure 7 It is the right view of the present invention.

[0036] In the figure: 2, base, 3, bracket, 4, mounting seat, 5, oil storage tank, 6, heat treatment reactor, 7, recovery and filtering mechanism, 71, separation bin, 72, recovery component, 721, recovery pipe, 722, third solenoid valve, 73, separation component, 731, motor, 732, rotating shaft, 733, scraper, 734, filter barrel, 735, drain pipe, 736, fourth solenoid valve, 74, drain pipe, 75, first solenoid valve, 76, reflux pipe, 77, second solenoid valve, 8, automatic reactor cover assembly, 81, reactor cover, 82, electric push rod, 83, material storage net box, 9, oil pump, 10, oil inlet pipe, 11, vacuum component, 111, vacuum pump, 112, exhaust pipe, 12, controller. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-7 The present invention provides a technical solution for a ZL205A alloy casting heat treatment device, comprising a base 2, two brackets 3, a mounting seat 4, an oil storage tank 5, a heat treatment reactor 6, an oil pump 9 and an oil inlet pipe 10, wherein the two brackets 3 are respectively arranged at the middle positions of the front and rear sides of the top of the base 2, the mounting seat 4 is arranged on the right side of the two brackets 3, the oil storage tank 5 is fixedly installed at the top right end of the base 2, the heat treatment reactor 6 is fixedly installed on the top of the mounting seat 4, the oil pump 9 is arranged at the right bottom of the oil storage tank 5, and one end of the oil inlet pipe 10 is installed at the oil pump 9. The top of the heat treatment reactor 6 is provided with the other end thereof, and the other end thereof is installed with the bottom of the right side of the heat treatment reactor 6, and further comprises: a recovery and filtering mechanism 7, an automatic reactor cover assembly 8, a vacuum assembly 11 and a controller 12, wherein the recovery and filtering mechanism 7 is provided on the left side of the two brackets 3, the automatic reactor cover assembly 8 is provided on the top of the heat treatment reactor 6, the vacuum assembly 11 is provided on the top left end of the base 2, the controller 12 is fixedly installed on the front side of the oil storage tank 5, and the heat treatment reactor 6, the recovery and filtering mechanism 7, the automatic reactor cover assembly 8, the oil pump 9 and the vacuum assembly 11 are all electrically connected with the controller 12;

[0039] The controller 12 controls the oil pump 9 to inject the oil in the inner cavity of the oil storage tank 5 into the inner cavity of the heat treatment reactor 6, and the vacuum component 11 extracts the air in the inner cavity of the heat treatment reactor 6. The alloy casting is heat treated in the inner cavity of the heat treatment reactor 6. After the heat treatment process is completed, the recovery and filtering mechanism 7 extracts the oil in the inner cavity of the heat treatment reactor 6, and at the same time, the bubbles in the oil are discharged, and the water and impurities are separated, and the filtered oil is re-injected into the oil storage tank 5;

[0040] The recovery and filtering mechanism 7 includes a separation chamber 71, a recovery component 72, a separation component 73, a drain pipe 74, a first solenoid valve 75, a reflux pipe 76 and a second solenoid valve 77. The separation chamber 71 is fixedly installed on the left side of the two brackets 3, and the bottom of the inner cavity of the separation chamber 71 gradually tilts downward from the outside to the inside. Since oil and water are incompatible, the density of water is greater than that of oil, so that the oil and water are layered up and down, so that the water that sinks due to its high density can gather at the bottom of the separation chamber 71; the recovery component 72 is arranged on the left side of the heat treatment reactor 6 and is electrically connected to the controller 12; the separation component 73 is arranged on the separation chamber 71 The drain pipe 74 is arranged at the bottom of the separation bin 71; the first solenoid valve 75 is installed at the bottom of the drain pipe 74 and is electrically connected to the controller 12. The controller 12 controls the first solenoid valve 75 to open, so that the water gathered at the bottom of the separation bin 71 can be discharged through the drain pipe 74; one end of the return pipe 76 is plugged into the right end of the bottom of the separation layer 71, and the other end is installed with the oil storage tank 5; the second solenoid valve 77 is installed in the middle of the return pipe 76 and is electrically connected to the controller 12. The controller 12 controls the second solenoid valve 77 to open, so that the oil can flow back to the oil storage tank 5 through the return pipe 76.

[0041] As a preferred solution, further, Figure 2-4 As shown, the recovery component 72 includes a recovery pipe 721 and a third solenoid valve 722. The recovery pipe 721 is inserted in the middle position of the left side of the heat treatment reactor 6. One end of the recovery pipe 721 extends to the bottom of the heat treatment reactor 6, and the other end is inserted into the inner cavity of the separation chamber 71; the third solenoid valve 722 is installed in the middle of the recovery pipe 721 and is electrically connected to the controller 12. During the heat treatment reaction, the oil fills the inner cavity of the heat treatment reactor 5, and the height of the liquid level is higher than the highest point of the recovery pipe 721. After the controller 12 controls the third solenoid valve 722 to open, the oil quickly fills the inner cavity of the recovery pipe 721 under the action of its own gravity. The pressure difference at both ends of the oil column in the recovery pipe 721 is used to make the oil rise and then flow into the lower separation chamber 71. Since the oil at the mouth of the recovery pipe 721 is subjected to different atmospheric pressures, the oil will flow from the side with high pressure to the side with low pressure. The oil in the heat treatment reactor 6 can be quickly extracted by the siphon phenomenon.

[0042] As a preferred solution, further, Figure 4 As shown, the recovery pipe 721 extends to a position at one end of the bottom of the heat treatment reactor 6 that is higher than the position at the other end, and the water outlet extending to the bottom 6 of the heat treatment reactor is lower than the liquid level of the heat treatment reactor, so that the downward pressure on the liquid level at the water outlet is greater than the upward atmospheric pressure, thereby ensuring the stable outflow of oil until the heat treatment reactor 6 is emptied.

[0043] As a preferred solution, further, Figure 5 As shown, the separation assembly 73 includes a motor 731, a rotating shaft 732, a scraper 733, a filter barrel 734, a drain pipe 735 and a fourth solenoid valve 736. The motor 731 is fixedly installed on the top of the separation bin 71 and is electrically connected to the controller 12; the rotating shaft 732 is fixedly installed on the output end of the motor 731; the filter barrel 734 is fixedly installed on the right wall of the inner cavity of the separation bin 71, the filter barrel 734 is located at the bottom of the recovery pipe 721, and the bottom of the inner cavity of the filter barrel 734 gradually tilts downward from the outside to the inside; there are a plurality of scrapers 733, which are respectively installed circumferentially at the bottom end of the rotating shaft 732, and the plurality of scrapers 733 are in close contact with the inner wall of the filter barrel 734, and the oil passes through the recovery pipe 721. The collecting tube 721 flows into the inner cavity of the filter barrel 734, and after being filtered by the filter barrel 734, the impurities remain on the inner cavity side wall of the filter barrel 734. The controller 21 controls the motor 731 to drive a number of scrapers 733 to rotate, thereby scraping off the impurities remaining on the inner wall of the filter barrel 734 and collecting them at the bottom of the filter barrel 734, thereby ensuring that the filter barrel 734 will not be blocked by debris; one end of the sewage pipe 735 is installed at the bottom of the filter barrel 734, and the other end extends to the outside of the separation bin 71; the fourth solenoid valve 736 is arranged at the bottom of the sewage pipe 735, and is electrically connected to the controller 12. The controller 12 controls the fourth solenoid valve 736 to open, so that the collected impurities can be discharged from the sewage pipe 735.

[0044] As a preferred solution, further, Figure 5 As shown, the side wall of the filter barrel 734 is provided with numerous small holes, which can filter out impurities and at the same time, the bubbles in the oil can be driven out by the oil passing through the small holes.

[0045] As a preferred solution, further, the automatic kettle cover assembly 8 includes a kettle cover 81, an electric push rod 82 and a material storage net box 83. There are two electric push rods 82, which are fixedly installed on the front and rear sides of the heat treatment reactor 6, and are electrically connected to the controller 12; the kettle cover 81 is fixedly installed on the output ends of the two electric push rods 82; the material storage net box 83 is detachably installed on the bottom of the kettle cover 81, and the controller 12 can control the two electric push rods 82 to drive the kettle cover 81 to open and close.

[0046] As a preferred solution, further, Figure 1-2As shown, the vacuum assembly 11 includes a vacuum pump 111 and an exhaust pipe 112. The vacuum pump 111 is fixedly installed at the top left end of the base 2 and is electrically connected to the controller 12. One end of the exhaust pipe 112 is installed at the front side of the vacuum pump 111, and the other end is installed at the front top of the heat treatment reactor 6. The vacuum pump 111 refers to a device or equipment that uses mechanical, physical, chemical or physicochemical methods to evacuate the container to obtain a vacuum. In this embodiment, the vacuum pump 111 is a device that generates and maintains a vacuum in the inner cavity of the heat treatment reactor 6.

[0047] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A ZL205A alloy casting heat treatment device, comprising a base (2), two brackets (3), a mounting seat (4), an oil storage tank (5), a heat treatment reactor (6), an oil pump (9) and an oil inlet pipe (10), wherein the two brackets (3) are respectively arranged at the middle positions of the front and rear sides of the top of the base (2), the mounting seat (4) is arranged on the right side of the two brackets (3), the oil storage tank (5) is fixedly installed on the top right end of the base (2), the heat treatment reactor (6) is fixedly installed on the top of the mounting seat (4), the oil pump (9) is arranged at the right bottom of the oil storage tank (5), one end of the oil inlet pipe (10) is installed on the top of the oil pump (9), and the other end is installed with the right bottom of the heat treatment reactor (6), It is characterized in that Also includes: A recovery and filtering mechanism (7) is arranged on the left side of the two brackets (3); An automatic kettle cover assembly (8) is arranged on the top of the heat treatment reactor (6); A vacuum assembly (11) is arranged at the top left end of the base (2); A controller (12) is fixedly mounted on the front side of the oil storage tank (5), and the heat treatment reactor (6), the recovery and filtering mechanism (7), the automatic reactor cover assembly (8), the oil pump (9) and the vacuum assembly (11) are all electrically connected to the controller (12); The recovery and filtering mechanism (7) comprises: A separation bin (71) is fixedly mounted on the left side of the two brackets (3), and the bottom of the inner cavity of the separation bin (71) is gradually inclined downward from the outer side to the inner side; A recovery component (72) is disposed on the left side of the heat treatment reactor (6) and is electrically connected to the controller (12); A separation component (73) is disposed on the top of the separation bin (71) and is electrically connected to the controller (12); A drainage pipe (74) is arranged at the bottom of the separation bin (71); A first solenoid valve (75) is installed at the bottom end of the drain pipe (74) and is electrically connected to the controller (12); A return pipe (76), one end of which is plugged into the right end of the bottom of the separation layer (71), and the other end of which is installed with the oil storage tank (5); The second solenoid valve (77) is installed in the middle of the return pipe (76) and is electrically connected to the controller (12).

2. A ZL205A alloy casting heat treatment device according to claim 1, Features: The recovery assembly (72) comprises: A recovery pipe (721) is inserted into the middle position of the left side of the heat treatment reactor (6), one end of the recovery pipe (721) extends to the bottom of the heat treatment reactor (6), and the other end is inserted into the inner cavity of the separation chamber (71); The third solenoid valve (722) is installed in the middle of the recovery pipe (721) and is electrically connected to the controller (12).

3. A ZL205A alloy casting heat treatment device according to claim 2, Features: The recovery pipe (721) extends to the bottom of the heat treatment reactor (6) and one end thereof is located higher than the other end.

4. A ZL205A alloy casting heat treatment device according to claim 3, Features: The separation assembly (73) comprises: A motor (731) is fixedly mounted on the top of the separation bin (71) and is electrically connected to the controller (12); A rotating shaft (732) is fixedly mounted on the output end of the motor (731); A filter barrel (734) is fixedly mounted on the right wall of the inner cavity of the separation bin (71), the filter barrel (734) is located at the bottom of the recovery pipe (721), and the bottom of the inner cavity of the filter barrel (734) gradually slopes downward from the outside to the inside; A plurality of scrapers (733) are respectively installed at the bottom end of the rotating shaft (732) along the circumferential direction, and the plurality of scrapers (733) are in close contact with the inner wall of the filter barrel (734); A sewage pipe (735), one end of which is mounted on the bottom of the filter barrel (734) and the other end of which extends to the outside of the separation chamber (71); The fourth solenoid valve (736) is disposed at the bottom end of the sewage discharge pipe (735) and is electrically connected to the controller (12).

5. A ZL205A alloy casting heat treatment device according to claim 4, Features: The side wall of the filter barrel (734) is provided with numerous small holes.

6. A ZL205A alloy casting heat treatment device according to claim 5, Features: The automatic kettle cover assembly (8) comprises: Two electric push rods (82) are fixedly installed on the front and rear sides of the heat treatment reactor (6) and are electrically connected to the controller (12); A kettle cover (81) is fixedly mounted on the output ends of the two electric push rods (82); The material storage net box (83) is detachably mounted on the bottom of the kettle cover (81).

7. A ZL205A alloy casting heat treatment device according to claim 6, Features: The vacuum assembly (11) comprises: A vacuum pump (111) is fixedly mounted on the top left end of the base (2) and is electrically connected to the controller (12); An exhaust pipe (112) has one end installed on the front side of the vacuum pump (111) and the other end installed on the front top of the heat treatment reactor (6).

8. A method for using a ZL205A alloy casting heat treatment device according to claim 7, Features: The following steps are involved: Step 1. Heat treatment process: The kettle cover (81) is raised, and the alloy casting is placed in the material storage net box (83). The oil is first placed in the heat treatment reactor (6) for heating and treatment, and the heat treatment reactor (6) is used to heat treat the alloy casting; Step 2. Oil recovery: After the heat treatment is completed, the third solenoid valve (722) is opened, and the oil flows into the separation chamber (71) through the recovery pipe (721); The recovery pipe (721) is inserted into the bottom of the heat treatment reactor (6) and sucks out the oil by relying on the dead weight of the liquid and the siphon phenomenon; Step 3. Separation of impurities: In the separation chamber (71), the oil flows through a filter barrel (734) with a scraper (733); The scraper (733) driven by the motor (731) moves along the rotating shaft (732) to help filter impurities and remove bubbles in the oil; The pure oil is discharged through the small holes in the side wall of the filter barrel (734); After the impurities are scraped onto the wall of the filter barrel (734), they are discharged through the sewage pipe (735) and the connected fourth electromagnetic valve (736).

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