A method of machining an electric air compressor crankcase

Abstract

The application discloses a processing method of an electric air compressor crankcase, which comprises the following processing steps: S1, material preparation; S2, blank forming; S3, rough machining and finish machining; S4, heat treatment and surface strengthening; and S5, quality detection; the sealing property and flatness of the inner wall of the cylinder body of the crankcase body in step S4 are detected by a detection device, and unqualified products are screened out; the detection device in the above steps comprises a mounting seat, a plugging mechanism and a cylinder detection mechanism, the plugging mechanism is mounted on the mounting frame, and the cylinder detection mechanism is mounted on the mounting frame. The high-quality crankcase body is produced through the processing technology, and the produced crankcase body is detected; the mounting holes on the crankcase body except the cylinder body are plugged through the setting of the plugging mechanism, the sealing performance of the cylinder body is facilitated to be detected, and the sealing property and flatness of the inner wall of the cylinder body are detected through the cylinder detection mechanism.

Description

Technical Field

[0001] This invention relates to the field of crankcase manufacturing technology, and in particular to a method for processing an electric air compressor crankcase. Background Technology

[0002] An electric air compressor is a device used to compress gas. Most air compressors are reciprocating piston, rotary vane, or rotary screw types. In the case of a piston-type air compressor, the crankshaft rotates in the crankcase during operation. The rotating crankshaft drives the piston to move up and down in the piston cylinder in the crankcase, and the up-and-down movement of the piston repeatedly compresses the air.

[0003] In the prior art, Chinese Patent Publication No. CN101737303A discloses a crankcase design for an air compressor, including a motor stator, a motor rotor, a crankcase, and a cylinder. The motor stator and cylinder are fastened to the crankcase. It primarily uses the motor rotor to drive the crankshaft to rotate within the crankcase. During crankshaft rotation, the piston moves up and down within the cylinder on the crankcase. Therefore, the inner wall of the cylinder within the crankcase needs to be kept smooth to ensure smooth piston movement within the cylinder. Existing crankcase manufacturing processes typically involve initially machining the crankcase using casting or forging processes, and then machining the cylinder within the crankcase. The crankcase is manufactured as shown in the appendix to the specification. Figure 1 As shown, for crankcases manufactured by machining, the precision of the inner wall of the cylinder and the sealing effect between it and the piston cannot be effectively measured. As a result, the movement between the cylinder and the piston in the manufactured crankcase is not smooth enough, and a long running-in period is required to achieve a better air compression effect. Summary of the Invention

[0004] Therefore, it is necessary to provide a machining method for the crankcase of an electric air compressor to address the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for machining an electric air compressor crankcase includes the following machining steps:

[0007] S1. Material preparation: Aluminum alloy raw materials are selected as the processing raw materials;

[0008] S2. Blank forming: The raw material is extruded into shape using extrusion forming equipment to prepare the crankcase body;

[0009] S3. Rough and fine machining: The crankcase housing is machined on the reference surface, the mounting holes are tapped, and the bearing seat holes and cylinder mounting surfaces are bored.

[0010] S4. Heat treatment and surface strengthening: The crankcase housing in step S3 is subjected to heat treatment and surface treatment.

[0011] S5. Quality Inspection: The sealing and flatness of the inner wall of the crankcase in step S4 are inspected using testing equipment to screen out unqualified products.

[0012] The testing equipment in the above steps includes a mounting base, a sealing mechanism, and a cylinder testing mechanism. The mounting base is equipped with a mounting bracket, the sealing mechanism is mounted on the mounting bracket and corresponds to the mounting holes on the crankcase; the cylinder testing mechanism is mounted on the mounting bracket and corresponds to the cylinder on the crankcase.

[0013] In a preferred embodiment of the processing method for an electric air compressor crankcase provided by the present invention, the cylinder detection mechanism includes a detection cylinder mounted to the crankcase body, an outer piston rod inserted into the inner cavity of the detection cylinder, and an inner detection rod vertically inserted into the middle of the outer piston rod. A detection air pipe is mounted on the detection cylinder. The bottom outer ring of the outer piston rod abuts against the outer end of a sealing mechanism on the crankcase body. The lower end of the inner detection rod extends into the cylinder body, and a detection head is mounted on the bottom of the inner detection rod. The outer ring of the detection head abuts against the outer ring of the cylinder. A distance sensor corresponding to the top of the inner detection rod is installed in the outer piston rod. High-pressure gas is injected into the inner cavity of the detection cylinder through the detection air pipe, causing the outer piston rod to push down and seal the mounting hole of the cylinder. This, combined with the sealing mechanism, seals the mounting hole on the crankcase, facilitating a tight seal. When detecting the smoothness of the cylinder's inner wall, the inner detection rod, located in the middle of the outer piston rod, is inserted into the cylinder, ensuring the detection head is in close contact with the inner wall. At this time, the control... Increases or decreases in air pressure within the cylinder cavity drive the inner detection rod to move up and down. This causes the detection head to slide along the inner wall of the cylinder. A distance sensor continuously monitors the displacement of the inner detection rod. When the inner wall of the cylinder is relatively flat, the distance sensor detects a uniform displacement of the inner detection rod. However, when the uniformity of the detection head is low, it encounters resistance as it moves along the inner wall, and the distance sensor detects an uneven displacement, thus determining the flatness of the inner wall. Furthermore, when the outer ring of the detection head contacts the inner wall of the cylinder, high-pressure gas is injected into the corresponding side air hole. The distance sensor detects the fluctuation at the end of the inner detection rod, indicating the pressure exerted on the detection head and thus the airtightness of the inner wall at the corresponding point. By adjusting the up-and-down movement of the detection head, the sealing performance at different locations on the inner wall of the cylinder is tested. This process improves the quality of the produced crankcase and reduces the break-in period for the cylinder blocks within the crankcase.

[0014] In a preferred embodiment of the processing method for an electric air compressor crankcase provided by the present invention, the detection head includes a detection chamber connected to the end of an inner detection rod, sealing flaps fixed to the upper and lower parts of the outer ring of the detection chamber, and an elastic membrane surrounding the outer ring of the detection chamber. The upper end of the elastic membrane is connected to the sealing flap located at the upper part of the detection chamber, and the lower end of the elastic membrane is connected to the sealing flap located at the lower part of the detection chamber. Multiple adjusting pistons are inserted into the outer layer of the detection chamber. The outer end of the adjusting piston is connected to the inner wall of the elastic membrane. By increasing the pressure in the inner cavity of the detection chamber, the adjusting piston can be pushed outward, and the elastic membrane of the outer ring can be pushed outward. As shown in the figure, the outer wall of the convex elastic membrane abuts against the inner wall of the cylinder. At this time, by moving the detection head, the outer side of the elastic membrane will move along the inner wall of the cylinder. The movement of the cylinder wall is used to detect the smoothness of the displacement of the detection head and the inner detection rod, and to detect the flatness of the inner wall of the cylinder. When detecting the sealing performance of the inner wall of the cylinder, the air pressure in the detection chamber is reduced to create a negative pressure on the inner wall of the detection chamber, as shown in the figure. The adjusting piston moves towards the center of the detection chamber, which causes the elastic diaphragm to concave inward. The distance between the upper and lower ends of the concave elastic diaphragm decreases, thereby causing the sealing flap connected to the upper and lower ends of the elastic diaphragm to move towards the center of the elastic diaphragm. At this time, the outer ring of the sealing flap gradually approaches the inner wall of the cylinder and abuts against the inner wall of the cylinder, thus achieving the sealing effect on the inner wall of the cylinder. This achieves the function of controlling the sealing of the inner wall of the cylinder by the detection chamber, which facilitates the detection of the cylinder's airtightness. The detection chamber has a disc-shaped structure that can fit into the circular structure of the inner cavity of the cylinder.

[0015] In a preferred embodiment of the processing method for the crankcase of an electric air compressor provided by the present invention, the sealing flap is made of elastic rubber, and the elastic membrane is made of elastic plastic. The end of the elastic membrane is connected to the middle of the sealing flap. When the elastic membrane is controlled to bulge outward, the outer wall of the plastic elastic membrane contacts the inner wall of the cylinder, which can reduce the problem of uneven sliding between the elastic membrane and the cylinder caused by the material of the elastic membrane itself, and improve the accuracy of the test. When the elastic membrane is controlled to be concave inward, the front end of the rubber sealing flap abuts against the inner wall of the cylinder, which improves the sealing between the outer ring of the test chamber and the inner wall of the cylinder, making it convenient to test the sealing performance at different positions of the cylinder. Thus, by controlling the high pressure and negative pressure operation of the test chamber, the flatness and sealing performance of the inner wall of the cylinder can be switched for testing, improving the convenience of the test.

[0016] In a preferred embodiment of the processing method for the crankcase of an electric air compressor provided by the present invention, a second solenoid valve is installed in the upper part of the inner cavity of the outer piston rod, a third solenoid valve is installed in the inner cavity of the inner detection rod, a first air pressure sensor is installed in the inner cavity of the detection chamber, and an air pump is connected to the outside of the detection cylinder. When the air pump operates and it is necessary to control the outer piston rod to move forward and seal the cylinder port, the second solenoid valve is closed, thus sealing the middle of the outer piston rod. High-pressure gas is injected into the inner cavity of the detection cylinder through the air pump. The air pressure pushes the outer piston rod downward and seals the cylinder port. After sealing is completed, the second and third solenoid valves are opened, and gas enters the inner detection rod. The probe enters the testing chamber, increasing the internal pressure. When the pressure reaches a set value, the third solenoid valve closes to maintain a certain pressure. The vertical displacement of the inner testing rod is adjusted by continuously increasing or decreasing the pressure. Conversely, the second and third solenoid valves open to draw pressure into the inner cavity of the testing cylinder, creating a negative pressure. The third solenoid valve closes to maintain a stable pressure. The vertical displacement of the inner testing rod is adjusted by continuously increasing or decreasing the pressure, allowing for flexible control of the pressure within the testing chamber. Simultaneously, the vertical displacement of the inner testing rod adjusts the position of the testing chamber, facilitating the testing of the cylinder's inner wall flatness and sealing.

[0017] As a preferred embodiment of the processing method of the crankcase of an electric air compressor provided by the present invention, the mounting base is further provided with a detection intelligent controller, which is respectively provided with a blocking module, a detection module and an early warning module. The blocking module is connected to the detection module, the air pump, solenoid valve two and solenoid valve three, respectively. The detection module is connected to the early warning module, the distance sensor, solenoid valve three and the air pressure sensor one, respectively.

[0018] In a preferred embodiment of the processing method for the crankcase of an electric air compressor provided by the present invention, a return spring is installed in the inner cavity of the detection cylinder, the bottom of the return spring abuts against the top of the outer piston stop rod, a guide rod is installed in the inner cavity of the detection cylinder and inserted into the top of the outer piston stop rod, and an electromagnet corresponding to the guide rod is installed on the top of the outer piston stop rod. The guide rod is made of ferromagnetic metal, and the sealing module is signal-connected to the electromagnet. After the position of the outer piston stop rod is adjusted, the sealing module controls the electromagnet to work, the electromagnet generates magnetism and magnetically attracts the guide rod, thereby fixing the outer piston stop rod and the guide rod, and fixing the position of the outer piston stop rod.

[0019] In a preferred embodiment of the processing method for an electric air compressor crankcase provided by the present invention, the sealing mechanism includes a sealing cylinder mounted to a mounting bracket and a sealing piston rod inserted into the inner cavity of the sealing cylinder. The front end of the sealing piston rod corresponds to the mounting hole on the crankcase body. Multiple sealing cylinders are connected in series through sealing air pipes. By injecting high-pressure gas into the sealing air pipes, the gas pressure pushes the sealing piston rod to move, so that the front end of the sealing piston rod seals the mounting hole on the crankcase body, which facilitates the detection of the sealing performance inside the crankcase body.

[0020] In a preferred embodiment of the processing method for an electric air compressor crankcase provided by the present invention, the input end of the sealing air pipe is connected to the output end of the air pump. A second air pressure sensor is installed in the sealing air pipe. The sealing module is connected to the first solenoid valve and the second air pressure sensor for signal transmission. When it is necessary to seal the mounting holes on the crankcase, the sealing module controls the first solenoid valve to open, allowing gas to enter the sealing air pipe and pressurize multiple sealing cylinders, pushing multiple sealing piston rods to extend and seal the mounting holes. At this time, the second air pressure sensor feeds back the detected pressure value to the sealing module. The sealing module compares the pressure value with a preset pressure value. When it is determined that the preset pressure value has been reached, the sealing module controls the first solenoid valve to close, thereby limiting the position of the sealing piston rods and sealing the mounting holes on the crankcase.

[0021] In a preferred embodiment of the processing method for the crankcase of an electric air compressor provided by the present invention, the testing chamber is a disc-shaped structure that can fit into the inner circular structure of the cylinder.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention provides a processing method for an electric air compressor crankcase, which produces a high-quality crankcase body through processing technology, and inspects the produced crankcase body. By setting a sealing mechanism, the mounting holes on the crankcase body except for the cylinder block are sealed to facilitate the testing of the sealing performance at the cylinder block. The sealing performance and flatness of the inner wall of the cylinder are tested by a cylinder testing mechanism.

[0024] 2. The present invention provides a processing method for an electric air compressor crankcase. When detecting the smoothness of the inner wall of the cylinder, an inner detection rod located in the middle of the outer piston rod is inserted into the cylinder, ensuring the detection head is in close contact with the inner wall. By controlling the increase or decrease of the air pressure inside the detection cylinder, the inner detection rod can be moved up and down. This causes the detection head to slide along the inner wall of the cylinder. A distance sensor detects the displacement distance of the inner detection rod in real time. When the inner wall of the cylinder has high smoothness, the distance sensor can detect a uniform displacement of the inner detection rod. When the uniformity of the detection head is low, the detection head moves along the inner wall of the cylinder. When the detection head encounters resistance, the distance sensor detects that the inner detection rod does not have uniform displacement, thus determining the flatness of the cylinder inner wall. When the outer ring of the detection head abuts against the inner wall of the cylinder, high-pressure gas is injected into the side air hole corresponding to the cylinder. The distance sensor detects the fluctuation state of the end of the inner detection rod, which determines the state of the gas pressure pushing force on the detection head at the end of the inner detection rod, thus determining the airtightness of the inner wall of the cylinder corresponding to the detection head. By adjusting the up and down movement of the detection head, the airtightness of different positions on the inner wall of the cylinder is detected. The crankcase housing produced is then inspected, improving the quality of the produced products and reducing the break-in period of the cylinder in the crankcase housing. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the compressor and crankcase in the prior art;

[0027] Figure 2 The processing flow chart provided by this invention;

[0028] Figure 3 This is a schematic diagram of the testing equipment provided by the present invention testing the crankcase housing;

[0029] Figure 4 This is a cross-sectional view of the crankcase housing during testing using the testing equipment provided by the present invention.

[0030] Figure 5 Provided by the present invention Figure 4 Enlarged view of point A in the middle;

[0031] Figure 6 A schematic diagram of the locking rod and outer piston stop provided by the present invention;

[0032] Figure 7 Provided by the present invention Figure 5 Schematic diagram of the structure during pressurization of the detection chamber;

[0033] Figure 8 Provided by the present invention Figure 5 Schematic diagram of the structure during decompression of the detection chamber in the middle;

[0034] Figure 9 The control principle block diagram of the detection controller provided by the present invention.

[0035] The markings in the diagram are explained as follows:

[0036] 1. Crankcase housing; 2. Mounting bracket; 3. Cylinder block; 4. Mounting seat; 5. Intelligent detection controller; 6. Sealing mechanism; 7. Sealing air pipe; 8. Solenoid valve one; 9. Cylinder detection mechanism; 10. Detection air pipe; 11. Sealing cylinder; 12. Sealing piston rod; 13. Pressure sensor two; 14. Detection cylinder; 15. Outer piston stop rod; 16. Pressure sensor one; 17. Inner detection rod; 18. Detection head; 19. Solenoid valve two; 20. Electromagnet; 21. Distance sensor; 22. Solenoid valve three; 23. Detection chamber; 24. Sealing flap; 25. Elastic diaphragm; 26. Adjusting piston. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Example

[0040] Please refer to Figures 2-5 A method for machining an electric air compressor crankcase includes the following machining steps:

[0041] S1. Material preparation: Aluminum alloy raw materials are selected as processing raw materials. They are low in cost, have good wear resistance, and are suitable for medium and low speed compressors. They need to be formed by casting process.

[0042] S2. Blank forming: The raw material is extruded into shape using extrusion forming equipment to prepare crankcase body 1, and the mechanical strength of the material is improved by hot forging.

[0043] S3. Rough and Finish Machining: The crankcase housing 1 is machined on the reference surface. The blank shape is used for alignment, and the center hole and key machining lines are marked. The mounting surface and bearing seat hole are preliminarily machined by milling or lathe. Then, the mounting hole is tapped. A rotary machining equipment is used to complete multiple machining processes (such as end milling, screw hole drilling, and tapping) in one clamping, reducing repeated clamping errors and improving efficiency. Then, the bearing seat hole and cylinder mounting surface are bored to ensure that the inner hole tolerance reaches IT6-IT7 grade (±0.01mm) and the surface roughness Ra≤0.4μm.

[0044] S4. Heat treatment and surface strengthening: The crankcase housing 1 in step S3 is subjected to heat treatment and surface treatment. The aluminum alloy parts are subjected to aging treatment to stabilize the structure. The steel parts are subjected to carburizing or nitriding treatment to improve the surface hardness. Hard chrome plating (0.05-0.1mm thick) or laser quenching are used to reduce the coefficient of friction and enhance wear resistance.

[0045] S5. Quality Inspection: The sealing and flatness of the inner wall of the cylinder block 3 of the crankcase 1 in step S4 are inspected using testing equipment, and unqualified products are screened out.

[0046] Please refer to Figures 3-5 The testing equipment in the above steps includes a mounting base 4, a sealing mechanism 6, and a cylinder testing mechanism 9. A mounting bracket 2 is mounted on the mounting base 4. The sealing mechanism 6 is mounted on the mounting bracket 2 and corresponds to the mounting holes on the crankcase 1. The cylinder testing mechanism 9 is mounted on the mounting bracket 2 and corresponds to the cylinder 3 on the crankcase 1. The produced crankcase 1 is placed on the mounting base 4, and the inner wall of the cylinder 3 on the crankcase 1 is tested. During the test, the sealing mechanism 6 is used to seal the mounting holes on the crankcase 1 except for the cylinder 3, which facilitates the testing of the sealing performance of the cylinder 3. The cylinder testing mechanism 9 tests the sealing and flatness of the inner wall of the cylinder 3.

[0047] It is worth mentioning that, such as Figure 4 and Figure 5As shown, the cylinder detection mechanism 9 includes a detection cylinder 14 installed with the crankcase 1, an outer piston rod 15 inserted into the inner cavity of the detection cylinder 14, and an inner detection rod 17 vertically inserted into the middle of the outer piston rod 15. A detection air pipe 10 is installed on the detection cylinder 14. The bottom outer ring of the outer piston rod 15 abuts against the outer end of the sealing mechanism 6 on the crankcase 1. The lower end of the inner detection rod 17 extends into the cylinder 3. A detection head 18 is installed at the bottom of the inner detection rod 17. The outer ring of the detection head 18 abuts against the outer ring of the cylinder 3. A distance sensor 21 corresponding to the top of the inner detection rod 17 is installed in the outer piston rod 15. High-pressure gas is injected into the inner cavity of the detection cylinder 14 through the detection air pipe 10, causing the outer piston rod 15 to push down and seal the mounting hole of the cylinder 3. In conjunction with the sealing mechanism 6, the mounting hole on the crankcase 1 is sealed, facilitating the sealing gap.

[0048] Through the above design, when detecting the smoothness of the inner wall of the cylinder 3, the inner detection rod 17, located in the middle of the outer piston stop rod 15, is inserted into the cylinder 3, and the detection head 18 is pressed tightly against the inner wall of the cylinder 3. At this time, by controlling the increase or decrease of the air pressure in the inner cavity of the detection cylinder 14, the inner detection rod 17 can be pushed up and down. The inner detection rod 17 then drives the detection head 18 to slide along the inner wall of the cylinder 3. The displacement distance of the inner detection rod 17 is detected in real time by the distance sensor 21. When the smoothness of the inner wall of the cylinder 3 is high, the distance sensor 21 can detect the uniform displacement of the inner detection rod 17. However, when the smoothness of the detection head 18 is low, the detection head 18 will move along the inner wall of the cylinder 3. 8 will encounter certain resistance. At this time, the distance sensor 21 detects that the inner detection rod 17 does not have uniform displacement, thereby judging the flatness of the inner wall of the cylinder body 3. When the outer ring of the detection head 18 abuts against the inner wall of the cylinder body 3, high-pressure gas is injected into the side air hole corresponding to the cylinder body 3. By detecting the end fluctuation state of the inner detection rod 17 through the distance sensor 21, it can be judged that the detection head 18 at the end of the inner detection rod 17 is subjected to the air pressure driving force, thereby judging the sealing of the inner wall of the cylinder body 3 corresponding to the detection head 18. By adjusting the up and down movement of the detection head 18, the sealing of different positions of the inner wall of the cylinder body 3 is detected. The crankcase housing 1 produced is tested to improve the quality of the produced products and reduce the break-in period of the cylinder body 3 in the crankcase housing 1.

[0049] Additionally, please see Figure 7 and Figure 8The detection head 18 includes a detection chamber 23 connected to the end of the inner detection rod 17, sealing flaps 24 fixed to the upper and lower parts of the outer ring of the detection chamber 23, and an elastic membrane 25 surrounding the outer ring of the detection chamber 23. The upper end of the elastic membrane 25 is connected to the sealing flap 24 located at the upper part of the detection chamber 23, and the lower end of the elastic membrane 25 is connected to the sealing flap 24 located at the lower part of the detection chamber 23. Multiple adjusting pistons 26 are inserted into the outer layer of the detection chamber 23. The outer ends of the adjusting pistons 26 are connected to the inner wall of the elastic membrane 25. By increasing the pressure inside the detection chamber 23, the adjusting pistons 26 can be pushed outward, thereby pushing the elastic membrane 25 of the outer ring outward. Figure 7 As shown, the outer wall of the convex elastic membrane 25 abuts against the inner wall of the cylinder 3. At this time, by moving the detection head 18, the outer side of the elastic membrane 25 will move along the inner wall of the cylinder 3, thereby detecting the smoothness of the displacement of the detection head 18 and the inner detection rod 17, and detecting the flatness of the inner wall of the cylinder 3.

[0050] Furthermore, when testing the sealing performance of the inner wall of cylinder 3, the air pressure in the testing chamber 23 is reduced to create a negative pressure on the inner wall of the testing chamber 23, such as... Figure 8 As shown, the adjusting piston 26 moves toward the center of the detection chamber 23. The adjusting piston 26 causes the elastic diaphragm 25 to be concave, and the distance between the upper and lower ends of the concave elastic diaphragm 25 decreases. This causes the sealing petal 24 connected to the upper and lower ends of the elastic diaphragm 25 to move toward the center of the elastic diaphragm 25. At this time, the outer ring of the sealing petal 24 gradually approaches the inner wall of the cylinder 3 and abuts against the inner wall of the cylinder 3, thereby achieving the function of sealing the inner wall of the cylinder 3. This achieves the function of controlling the sealing of the inner wall of the cylinder 3 by the detection chamber 23, thus facilitating the detection of the airtightness of the cylinder 3. The detection chamber 23 has a disc-shaped structure that can fit into the circular structure of the inner cavity of the cylinder 3.

[0051] Preferred, such as Figure 5 As shown, the sealing flap 24 is made of elastic rubber, and the elastic membrane 25 is made of elastic plastic. The end of the elastic membrane 25 is connected to the middle of the sealing flap 24. When the elastic membrane 25 is controlled to bulge outward, the outer wall of the plastic elastic membrane 25 contacts the inner wall of the cylinder 3, which can reduce the problem of uneven sliding between the elastic membrane 25 and the cylinder 3 caused by the material of the elastic membrane itself, and improve the accuracy of the test. When the elastic membrane 25 is controlled to be concave inward, the front end of the rubber sealing flap 24 abuts against the inner wall of the cylinder 3, which improves the sealing between the outer ring of the test chamber 23 and the inner wall of the cylinder 3, making it convenient to test the sealing performance at different positions of the cylinder 3. By controlling the high pressure and negative pressure operation inside the test chamber 23, the flatness and sealing performance of the inner wall of the cylinder 3 can be switched, improving the convenience of the test.

[0052] In this embodiment, a second solenoid valve 19 is installed in the upper part of the inner cavity of the outer piston rod 15, a third solenoid valve 22 is installed in the inner cavity of the inner detection rod 17, and a first air pressure sensor 16 is installed in the inner cavity of the detection chamber 23. An air pump is connected to the outside of the detection cylinder 14. When the air pump operates and it is necessary to control the outer piston rod 15 to move forward and seal the port of the cylinder 3, the second solenoid valve 19 is closed, causing the middle of the outer piston rod 15 to be sealed. High-pressure gas is injected into the inner cavity of the detection cylinder 14 through the air pump. The air pressure pushes the outer piston rod 15 downward and seals the port of the cylinder 3. After sealing, the second solenoid valve 19 and the third solenoid valve 22 are opened, allowing gas to enter the inner detection rod 17 and then the detection chamber 23, increasing the pressure within the detection chamber 23. The pressure in the detection chamber 23 is controlled to reach a set value. At this time, the pressure in the detection chamber 23 is maintained at a certain level by controlling the solenoid valve 22 to close. The vertical displacement of the inner detection rod 17 is adjusted by continuously increasing or decreasing the pressure. In addition, the pressure in the detection chamber 23 is drawn into the inner cavity of the detection cylinder 14 by controlling the solenoid valve 29 and the solenoid valve 22 to close, so that the pressure in the detection chamber 23 is maintained at a stable level. The vertical displacement of the inner detection rod 17 is adjusted by continuously increasing or decreasing the pressure, so as to flexibly control the pressure in the detection chamber 23 and adjust the position of the detection chamber 23 by controlling the vertical displacement of the inner detection rod 17, so as to facilitate the detection of the flatness and sealing of the inner wall of the cylinder 3. Example

[0053] The machining method for an electric air compressor crankcase provided in Embodiment 1 is further optimized, differing from the first embodiment in that, as follows: Figures 5-9As shown, the mounting base 4 is also equipped with a detection controller 5, which includes a blocking module, a detection module, and an early warning module. The blocking module is connected to the detection module, the air pump, solenoid valve 19, and solenoid valve 22. The detection module is connected to the early warning module, the distance sensor 21, solenoid valve 22, and the air pressure sensor 16. When detecting the cylinder block 3 on the crankcase 1, the blocking module closes solenoid valve 19 and controls the air pump to inject high-pressure gas into the inner cavity of the detection cylinder 14, pushing the outer piston rod 15 down to block the port of the cylinder block 3. After the blocking is completed, the solenoid valve 19 and solenoid valve 22 are opened, allowing the high-pressure gas injected by the air pump to enter the detection chamber 23. The air pressure sensor 16 detects the air pressure data in the detection chamber 23 and feeds it back to the detection module. The detection module compares the feedback air pressure data with the preset air pressure data (the air pressure data in the detection chamber 23 during the flatness test is preset in the inspection module). When the air pressure data reaches the preset air pressure data, the detection module controls the solenoid valve 22 to close, so that the air pressure in the detection chamber 23 remains constant. At this time, the air pressure in the detection cylinder 14 is increased or decreased by controlling the air pump, and the vertical displacement of the inner detection rod 17 is adjusted. During this process, the distance sensor 21 transmits the distance data between the detector and the inner detection rod 17 in real time and feeds it back to the detection module. The detection module calculates the smoothness of the displacement of the inner detection rod 17 (the degree of change of the displacement distance of the inner detection rod 17 within a set time) based on the distance data fed back by the distance sensor 21, thereby judging the flatness of the inner wall of the cylinder 3, and sends the detection result through the warning module, issuing a corresponding audible and visual reminder.

[0054] Additionally, when it is necessary to test the sealing performance of the inner wall of cylinder 3, the detection module controls the solenoid valve 22 to open, at which point the gas in the detection cylinder 14 is extracted, creating a negative pressure inside. Correspondingly, a negative pressure gradually forms inside the detection chamber 23. The pressure sensor 16 feeds back the detected negative pressure data to the detection module. The detection module compares the fed-back pressure data with the preset pressure data (the detection module has preset pressure data for the detection chamber 23 during sealing tests). When the pressure data reaches the preset pressure data, the detection module controls the solenoid valve 22 to close, thus reducing the pressure inside the detection chamber 23. Maintaining a constant pressure, high-pressure gas is injected into the side air hole corresponding to the cylinder 3. The distance sensor 21 detects the end distance data of the inner detection rod 17 and feeds it back to the detection module. The detection module calculates the fluctuation degree of the inner detection rod 17 (the downward movement distance of the inner detection rod 17 under automatic air pressure environment) based on the distance data fed back by the distance sensor 21, thereby judging the sealing effect between the sealing petal 24 and the inner wall of the cylinder 3. The detection result is then sent out through the warning module, issuing corresponding audible and visual reminders, thereby judging the sealing performance of the inner wall of the cylinder 3 and improving the quality of the crankcase housing 1 produced.

[0055] It is worth mentioning that, such as Figure 6 As shown, a return spring is installed in the inner cavity of the detection cylinder 14. The bottom of the return spring abuts against the top of the outer piston stop rod 15. The return spring pushes the outer piston stop rod 15 downward, so that the outer piston stop rod 15 can move downward and fit tightly against the end of the cylinder body 3, sealing the port of the cylinder body 3. A guide rod is installed in the inner cavity of the detection cylinder 14 and inserted into the top of the outer piston stop rod 15. An electromagnet 20 corresponding to the guide rod is installed on the top of the outer piston stop rod 15. The guide rod is made of ferromagnetic metal. The sealing module is connected to the electromagnet 20. After the position of the outer piston stop rod 15 is adjusted, the sealing module controls the electromagnet 20 to work. The electromagnet 20 generates magnetism and magnetically attracts the guide rod, thereby fixing the outer piston stop rod 15 to the guide rod and fixing the position of the outer piston stop rod 15.

[0056] In this embodiment, as Figure 4 and Figure 9 As shown, the sealing mechanism 6 includes a sealing cylinder 11 mounted to the mounting bracket 2 and a sealing piston rod 12 inserted into the inner cavity of the sealing cylinder 11. The front end of the sealing piston rod 12 corresponds to the mounting hole on the crankcase 1. Multiple sealing cylinders 11 are connected in series through sealing air pipes 7. By injecting high-pressure gas into the sealing air pipes 7, the air pressure pushes the sealing piston rod 12 to move, so that the front end of the sealing piston rod 12 seals the mounting hole on the crankcase 1, which facilitates the detection of the internal sealing performance of the crankcase 1. The input end of the sealing air pipe 7 is connected to the output end of the air pump. A second air pressure sensor 13 is installed in the sealing air pipe 7. The sealing module is connected to the solenoid valve 8 and the second air pressure sensor 13 for signal transmission. When it is necessary to seal the mounting holes on the crankcase 1, the sealing module controls the opening of the solenoid valve 8, allowing gas to enter the sealing gas pipe 7 and pressurize multiple sealing cylinders 11. This pushes multiple sealing piston rods 12 to extend and seal the mounting holes. At this time, the pressure sensor 13 feeds back the detected pressure value to the sealing module. The sealing module compares the pressure value with the preset pressure value (the pressure value of the pressure sensor 13 when the sealing piston rod 12 is effectively sealing). When the preset pressure value is reached, the sealing module controls the solenoid valve 8 to close, thereby limiting the position of the sealing piston rod 12 and sealing the mounting holes on the crankcase 1.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A method for processing a crankcase of an electric air compressor, characterized in that, The processing steps include the following: S1. Material preparation: Aluminum alloy raw materials are selected as the processing raw materials; S2, Blank forming: The raw material is extruded into shape using extrusion molding equipment to prepare crankcase body (1). S3. Rough and fine machining: The crankcase housing (1) is machined on the reference surface, then the mounting holes are tapped, and then the bearing seat holes and cylinder mounting surfaces are bored. S4. Heat treatment and surface strengthening: The crankcase housing (1) in step S3 is subjected to heat treatment and surface treatment; S5. Quality inspection: The sealing and flatness of the inner wall of the cylinder block (3) of the crankcase (1) in step S4 are inspected by the inspection equipment, and unqualified products are screened out. The testing equipment in the above steps includes a mounting base (4), a sealing mechanism (6), and a cylinder testing mechanism (9). The mounting base (4) is equipped with a mounting bracket (2). The sealing mechanism (6) is mounted on the mounting bracket (2) and corresponds to the mounting hole on the crankcase (1). The cylinder testing mechanism (9) is mounted on the mounting bracket (2) and corresponds to the cylinder (3) on the crankcase (1). The cylinder detection mechanism (9) includes a detection cylinder (14) installed with the crankcase (1), an outer piston rod (15) inserted into the inner cavity of the detection cylinder (14), and an inner detection rod (17) vertically inserted into the middle of the outer piston rod (15). A detection air pipe (10) is installed on the detection cylinder (14). The bottom outer ring of the outer piston rod (15) abuts against the outer end of the sealing mechanism (6) on the crankcase (1). The lower end of the inner detection rod (17) extends into the cylinder (3). A detection head (18) is installed at the bottom of the inner detection rod (17). The outer ring of the detection head (18) abuts against the outer ring of the cylinder (3). A distance sensor (21) corresponding to the top of the inner detection rod (17) is installed in the outer piston rod (15). The detection head (18) includes a detection chamber (23) connected to the end of the inner detection rod (17), a sealing flap (24) fixed to the upper and lower parts of the outer ring of the detection chamber (23), and an elastic membrane (25) surrounding the outer ring of the detection chamber (23). The upper end of the elastic membrane (25) is connected to the sealing flap (24) located at the upper part of the detection chamber (23), and the lower end of the elastic membrane (25) is connected to the sealing flap (24) located at the lower part of the detection chamber (23). Multiple adjusting pistons (26) are inserted into the outer layer of the detection chamber (23). The outer end of the adjusting piston (26) is connected to the inner wall of the elastic membrane (25). A second solenoid valve (19) is installed in the upper part of the inner cavity of the outer piston rod (15). A third solenoid valve (22) is installed in the inner cavity of the inner detection rod (17). A first air pressure sensor (16) is installed in the inner cavity of the detection chamber (23). An air pump is connected to the outside of the detection cylinder (14). The mounting base (4) is also equipped with a detection controller (5). The detection controller (5) is equipped with a blocking module, a detection module and an early warning module. The blocking module is connected to the detection module, the air pump, the second solenoid valve (19) and the third solenoid valve (22) respectively. The detection module is connected to the early warning module, the distance sensor (21), the third solenoid valve (22) and the first air pressure sensor (16) respectively. The inner cavity of the detection cylinder (14) is equipped with a reset spring. The bottom of the reset spring abuts against the top of the outer piston rod (15). The inner cavity of the detection cylinder (14) is equipped with a guide rod that is inserted into the top of the outer piston rod (15). The top of the outer piston rod (15) is equipped with an electromagnet (20) corresponding to the guide rod. The guide rod is made of ferromagnetic metal. The blocking module is connected to the electromagnet (20) respectively.

2. The method for processing an electric air compressor crankcase according to claim 1, characterized in that, The sealing flap (24) is made of elastic rubber, and the elastic membrane (25) is made of elastic plastic. The end of the elastic membrane (25) is connected to the middle of the sealing flap (24).

3. The method for processing an electric air compressor crankcase according to claim 1, characterized in that, The sealing mechanism (6) includes a sealing cylinder (11) installed with the mounting bracket (2) and a sealing piston rod (12) inserted into the inner cavity of the sealing cylinder (11). The front end of the sealing piston rod (12) corresponds to the mounting hole on the crankcase (1). Multiple sealing cylinders (11) are connected in series through sealing air pipes (7).

4. The method for processing an electric air compressor crankcase according to claim 3, characterized in that, The input end of the sealing air tube (7) is connected to the output end of the air pump. A second air pressure sensor (13) is installed in the sealing air tube (7). The sealing module is connected to the first solenoid valve (8) and the second air pressure sensor (13) respectively.

5. The method for processing an electric air compressor crankcase according to claim 1, characterized in that, The testing chamber (23) has a disc-shaped structure.

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