Efficient arc discharge machining working medium filtering device

Abstract

This invention belongs to the field of electrical discharge machining (EDM) technology, aiming to solve the technical problems of existing technologies where the medium transmission pressure and filtration rate cannot be automatically adjusted, and the filter residue cannot be quickly discharged. Based on this, a high-efficiency EDM working medium filtration device is provided, including a storage tank detachably mounted on the lower end of the filter seat. The filter seat has an inlet and an outlet on its side wall. A piston cavity is formed inside the filter seat, and a piston sleeve is slidably fitted inside the piston cavity. The outer wall of the piston sleeve is slidably sealed to the inner wall of the piston cavity. Several outlet holes are formed on the inner wall of the piston sleeve, and a through-flue is formed between the outlet holes and the outlet, connecting them. A disc-shaped guide groove is fitted at the upper end of the storage tank. The high-efficiency EDM working medium filtration device of this invention has the advantages of automatically adjusting the medium transmission pressure and convenient filter residue discharge.

Description

Technical Field

[0001] This invention relates to the field of electrical discharge machining technology, and in particular to a high-efficiency arc discharge machining working medium filtration device. Background Technology

[0002] High-efficiency arc discharge (HEAD) utilizes the instantaneous high temperature generated by the discharge between the cathode and anode to erode materials, achieving efficient removal of various difficult-to-machine metals. Compared with traditional electrical discharge machining (EDM), the machining efficiency is significantly improved. The flushing fluid is crucial in HEAD, serving as both the working medium and a high-pressure fluid to flush away eroded materials and molten workpiece material. If the flushing fluid is contaminated, the stability of HEAD will decrease, and the risk of short circuits will increase. Due to the large amount of material removed, the eroded material is more likely to clog the flushing system, causing poor flushing flow and severely affecting the machining effect.

[0003] Existing high-efficiency arc discharge machining (EDM) flushing systems either lack filtration devices or directly use existing ones, failing to be customized for the specific characteristics of EDM. Firstly, the filtration rate is insufficient. Due to EDM's dependence on the flushing fluid, the filtration rate must be fast enough to meet flushing requirements and should be automatically adjustable to prevent clogging. Secondly, filter residue cannot be discharged quickly. Because EDM involves significant material erosion, the storage tank and filter screen require frequent disassembly and cleaning to remove filter residue. Summary of the Invention

[0004] This invention provides a high-efficiency arc discharge machining working medium filtration device to solve the technical problems in the prior art where the medium transmission pressure and filtration rate cannot be automatically adjusted and the filter residue cannot be quickly discharged.

[0005] This invention provides a high-efficiency arc discharge machining working medium filtration device, including a liquid storage tank detachably disposed at the lower end of the filter seat. The filter seat has an inlet and an outlet on its side wall. The filter seat has a piston cavity formed inside, and a piston sleeve is slidably fitted inside the piston cavity. The outer wall of the piston sleeve is slidably sealed to the inner wall of the piston cavity. The inner wall of the piston sleeve has a plurality of outlet holes, and a liquid passage cavity is formed between the outlet holes and the outlet and is connected through the liquid passage cavity.

[0006] The upper end of the liquid storage tank is fitted with a disc-shaped guide groove, the outer wall of which is tightly fitted to the inner wall of the liquid storage tank. A sliding hole is provided in the center of the guide groove, which is slidably sealed with the lower end of the piston sleeve. Several through holes are provided on the guide groove, which connect the liquid inlet to the liquid storage tank. The liquid outlet is isolated from the through holes by the piston sleeve. A filter is fitted through the sliding hole at the lower end of the piston sleeve. The top of the filter is connected to the piston sleeve. A filter screen cover is provided inside the piston sleeve. The lower end of the filter screen cover seals the upper opening of the filter. A spring baffle is provided above the filter screen cover. A cover spring is provided between the spring baffle and the filter screen cover. A lifting drive device is provided at the top of the filter seat. The output end of the lifting drive device extends downward into the filter seat and connects with the spring baffle.

[0007] Its working principle and process are as follows:

[0008] During normal use of the device, the external contaminated working medium enters the storage tank sequentially through the inlet, guide channel, and through hole. The working medium passes through the filter to be filtered clean. The clean working medium pushes open the filter screen cover, allowing it to enter the piston sleeve and pass through the outlet hole. Finally, it flows out from the outlet. Therefore, the pressure of the discharged working medium is stable. When it is necessary to adjust the transmission pressure and rate of the working medium, the lifting drive device moves the spring baffle up or down, thereby increasing or decreasing the pressure required for the working medium to drive the filter screen cover upward, thus changing the transmission pressure or rate of the working medium.

[0009] Furthermore, a piston spring is provided between the top of the piston sleeve and the top of the piston chamber, a drain port is provided at the lower end of the liquid storage tank, a sealing cap is provided outside the drain port, and a connecting pipe is provided at the lower end of the filter. The connecting pipe is slidably and sealingly connected to the drain port, and the length of the connecting pipe is less than the movement range of the piston sleeve.

[0010] If the filter becomes clogged, the fluid will push the filter and piston sleeve upwards, thereby pulling the connecting pipe out of the drain port. The fluid can then flow directly out of the drain port without passing through the filter. The sealing cap is designed to keep the drain port closed under normal conditions. To clear the blockage, first stop the water intake, then remove the sealing cap, drain the water from the storage tank, remove the storage tank from the filter holder 7, and remove the filter as well. After cleaning the storage tank and filter, reinstall them on the filter holder. This completes one process of removing filter residue.

[0011] Furthermore, the top sidewall of the piston sleeve is formed with a V-shaped groove, the liquid outlet is opened on the V-shaped groove, the liquid outlet is connected to the liquid outlet through the piston cavity, and a piston baffle is provided between the piston cavity and the liquid inlet to seal the connection between the liquid inlet and the through hole.

[0012] The V-groove design facilitates the formation of a liquid passage chamber between the groove and the outlet, allowing for easy communication between the outlet and the liquid outlet, and also makes it easier to fit with the filter screen cap later.

[0013] Furthermore, both the inlet and outlet are connected to threaded connectors.

[0014] The use of threaded fittings facilitates the connection of external pipes.

[0015] Furthermore, a pressure transmitter is provided on the threaded connector of the liquid outlet, the pressure transmitter is connected to a controller, and the controller is connected to the lifting drive device.

[0016] The working medium passes through the threaded joint, and after the pressure is measured by the pressure transmitter, it flows into the external pipeline. The pressure transmitter sends the real-time pressure signal to the controller, which monitors the fluid pressure in the filter device in real time. The controller then controls the lifting drive device to adjust the pressure in real time until the target pressure is reached.

[0017] Furthermore, the lifting drive device is a linear screw motor, and the top of the filter seat has a threaded hole for the screw to pass through. The screw of the linear screw motor passes through the threaded hole and connects to the spring baffle. The spring baffle has a cap-like structure with a cylindrical groove on its small surface. The top of the pressure cap spring is placed in the inner groove of the spring baffle. The upper edge of the filter screen pressure cap abuts against the inner wall of the piston sleeve. A sleeve rod is provided at the center of the top of the filter screen pressure cap, and the lower end of the pressure cap spring is sleeved on the sleeve rod.

[0018] The use of a linear screw motor allows for more precise movement of the spring baffle, resulting in more accurate pressure changes monitored by the pressure transmitter. This facilitates precise adjustment of the working medium pressure by the controller. The sleeve facilitates the installation of the cover spring, and the inner groove ensures stable positioning of the cover spring. The contact between the inner wall of the piston sleeve and the filter cover helps to limit the movement of the filter cover.

[0019] Furthermore, the side wall of the storage tank is provided with a transparent viewing window.

[0020] The transparent viewing window allows for observation of the blockage status of the filter inside the storage tank.

[0021] Furthermore, the filter is a cylindrical filter screen with a through top and a bottom surface connected to the drain port via a connecting pipe.

[0022] Furthermore, the piston sleeve includes a piston portion at the upper end and a sliding portion at the lower end. The inner and outer diameters of the sliding portion are both smaller than the inner and outer diameters of the piston portion. The inner diameter of the lower end of the piston portion is larger than the inner diameter of the piston portion where the V-groove is formed. The filter screen cover includes an abutting sliding disc, a cover plate, and a sleeve rod. The abutting sliding disc is located above the cover plate. The cover plate is disposed on the top of the filter. The sleeve rod is disposed between the abutting sliding disc and the cover plate and is coaxially arranged with both. The sleeve rod is fixedly connected to the cover plate and the abutting sliding disc and passes upward through the abutting sliding disc. The abutting sliding disc is slidably engaged with the lower end of the piston portion.

[0023] The sliding part mainly cooperates with the sliding hole to realize the movement of the piston sleeve in the guide groove. The setting of the cover plate and the abutting sliding plate helps to improve the stability of the filter cover and ensure that the filter cover can move better up and down. The sleeve rod is used to stabilize and connect the cover plate and the abutting sliding plate.

[0024] In summary, the beneficial effects of the present invention are as follows:

[0025] 1. The device of this application has a real-time pressure monitoring and adjustment function, which can automatically adjust the fluid pressure in the filter and the fluid transmission rate according to the pressure to prevent clogging;

[0026] 2. This application has a real-time observation function, which can observe the condition inside the filter in real time through a transparent window, promptly detect filter blockage, and troubleshoot the problem;

[0027] 3. This application has a function of quickly discharging filter residue, and the storage tank and filter screen can be quickly and easily disassembled and cleaned. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a left view of the overall structure of the present invention;

[0030] Figure 3 for Figure 2 Sectional view of AA;

[0031] Figure 4 This is a front view of the piston sleeve in this invention;

[0032] Figure 5 for Figure 4 Sectional view of BB;

[0033] Figure 6 This is a front view of the filter screen cap in this invention;

[0034] Figure 7 This is a top view of the guide channel in this invention;

[0035] Figure 8 for Figure 7 Sectional view of CC

[0036] Figure 9 for Figure 3 Enlarged view of the structure of D in the middle.

[0037] In the diagram: 1. Filter holder; 11. Inlet; 12. Outlet; 13. Piston chamber; 14. Piston baffle; 15. Threaded connector; 2. Storage tank; 21. Drain; 22. Sealing cap; 23. Transparent viewing window; 3. Piston sleeve; 31. Piston part; 32. Sliding part; 33. Outlet hole; 34. Piston spring; 35. V-groove; 4. Guide groove; 41. Sliding hole; 42. Through hole; 5. Filter; 51. Connecting pipe; 6. Filter screen cover; 61. Spring baffle; 62. Cover spring; 63. Sleeve rod; 64. Abutment sliding plate; 65. Cover plate; 7. Lifting drive device; 8. Pressure transmitter; 9. Controller. Detailed Implementation

[0038] Example 1:

[0039] like Figures 1-9 As shown, a high-efficiency arc discharge machining working medium filtration device includes a filter seat 1 connected by threads to a liquid storage tank 2 at the lower end of the filter seat 1. A sealing ring is provided at the connection between the liquid storage tank 2 and the filter seat 1. An inlet 11 and an outlet 12 are provided on the side wall of the filter seat 1. Both the inlet 11 and the outlet 12 are provided with internal threads. A piston cavity 13 is formed inside the filter seat 1. A piston sleeve 3 is slidably sleeved inside the piston cavity 13. The outer wall of the piston sleeve 3 is slidably sealed with the inner wall of the piston cavity 13. A sealing ring is provided between the outer wall of the piston sleeve 3 and the piston cavity 13. The sealing ring is provided on the inner wall of the piston cavity 13. A plurality of outlet holes 33 are provided on the inner wall of the piston sleeve 3. The outlet holes 33 are circumferentially distributed at equal intervals on the piston sleeve 3. A liquid passage cavity is formed between the outlet holes 33 and the outlet 12 and is connected through the liquid passage cavity.

[0040] The upper end of the liquid storage tank 2 is fitted with a disc-shaped guide groove 4. The outer wall of the guide groove 4 is tightly fitted with the inner wall of the liquid storage tank 2, and a sealing ring is provided on the outer wall of the guide groove 4. A sliding hole 41 is provided in the center of the guide channel 4. The sliding hole 41 is slidably sealed with the lower end of the piston sleeve 3. Several through holes 42 are provided on the guide channel 4. The through holes 42 are distributed in a circumferential array on the guide channel 4. The through holes 42 connect the liquid inlet 11 to the liquid storage tank 2. The liquid outlet 12 is isolated from the through holes 42 by the piston sleeve 3. The lower end of the piston sleeve 3 passes through the sliding hole 41 and is fitted with a filter 5. The top of the filter 5 is connected to the piston sleeve 3. A filter screen cover 6 is provided inside the piston sleeve 3. The lower end of the filter screen cover 6 covers the upper opening of the filter 5. A spring baffle 61 is provided above the filter screen cover 6. A cover spring 62 is provided between the spring baffle 61 and the filter screen cover 6. A lifting drive device 7 is provided on the top of the filter seat 1. The output end of the lifting drive device 7 extends downward into the filter seat 1 and is connected to the spring baffle 61.

[0041] Its working principle and process are as follows:

[0042] During normal use of the device, the external dirty working medium enters the storage tank 2 sequentially through the inlet 11, the guide channel 4, and the through hole 42. The working medium passes through the filter 5 to be filtered clean. The clean working medium pushes open the filter screen cover 6, so that the working medium enters the piston sleeve 3 and passes through the outlet hole 33 of the piston sleeve 3, and finally flows out from the outlet 12. Therefore, the pressure of the discharged working medium is stable. When it is necessary to adjust the transmission pressure and rate of the working medium, the lifting drive device 7 drives the spring baffle 61 to move up or down, so that the pressure required for the working medium to drive the filter screen cover 6 to move up increases or decreases, thereby changing the transmission pressure or rate of the working medium.

[0043] In another embodiment of the invention, such as Figure 3 and Figure 9 As shown, a piston spring 34 is provided between the top of the piston sleeve 3 and the top of the piston chamber 13. A drain port 21 is provided at the lower end of the liquid storage tank 2, and a sealing cap 22 (a cap nut) is provided outside the drain port 21. The drain port 21 is a drain pipe with external threads on its outer wall. A connecting pipe 51 is provided at the lower end of the filter 5. This connecting pipe 51 is slidably and sealingly connected to the drain port 21, and the length of the connecting pipe 51 is less than the range of movement of the piston sleeve 3. The diameter and elastic force of the piston spring 34 are greater than those of the pressure cap spring 62.

[0044] If filter 5 becomes clogged, the fluid will push filter 5 and piston sleeve 3 upwards, thereby pulling connecting pipe 51 out of drain port 21. The fluid can then flow directly out of drain port 21 without passing through filter 5. The sealing cap 22 is designed to normally close drain port 21. To clear the blockage, first stop the water intake, then remove the sealing cap 22, drain the water accumulated in storage tank 2, remove storage tank 2 from filter base 17, and filter 5 will also be removed. After cleaning storage tank 2 and filter 5, reinstall them on filter base 1. This completes one process of discharging filter residue.

[0045] In another embodiment of the invention, such as Figures 3-5 As shown, the top sidewall of the piston sleeve 3 is formed with a V-shaped groove 35, and the liquid outlet 33 is opened on the V-shaped groove 35. The liquid outlet 33 is connected to the liquid outlet 12 through the piston cavity 13. A piston baffle 14 is provided between the piston cavity 13 and the liquid inlet 11 to seal the connection between the liquid inlet 11 and the through hole 42.

[0046] The V-groove 35 is designed to facilitate the formation of a liquid passage cavity between itself and the liquid outlet 12, making it easier for the liquid outlet 33 to connect with the liquid outlet 12. It also facilitates subsequent cooperation with the filter screen cover 6.

[0047] In another embodiment of the invention, such as Figures 1-3 As shown, both the inlet 11 and the outlet 12 are connected to threaded connectors 15.

[0048] The threaded fitting 15 is designed to facilitate the connection of external pipes.

[0049] In another embodiment of the invention, such as Figures 1-3 As shown, a pressure transmitter 8 is provided on the threaded connector 15 of the liquid outlet 12. The pressure transmitter 8 is connected to a controller 9, and the controller 9 is connected to the lifting drive device 7.

[0050] The working medium passes through the threaded connector 15, and after the pressure is measured by the pressure transmitter 8, it flows into the external pipeline. The pressure transmitter 8 sends the real-time pressure signal to the controller 9 to monitor the fluid pressure in the filter device in real time, and controls the lifting drive device 7 to adjust it in real time until the target pressure is reached.

[0051] In another embodiment of the invention, such as Figures 1-3As shown, the lifting drive device 7 is a linear screw motor. The top of the filter seat 1 has a threaded hole for the screw to pass through. The screw of the linear screw motor passes through the threaded hole and is connected to the spring baffle 61. The spring baffle 61 is detachably connected to the screw. The spring baffle 61 has a cover-shaped structure with a cylindrical groove on its small surface. The top of the cover spring 62 is placed in the inner groove of the spring baffle 61. The upper edge of the filter cover 6 abuts against the inner wall of the piston sleeve 3. A sleeve rod 63 is provided at the center of the top of the filter cover 6. The lower end of the cover spring 62 is sleeved on the sleeve rod 63.

[0052] The use of a linear screw motor makes the movement distance of the spring baffle 61 more precise, thereby making the pressure change value monitored by the pressure transmitter 8 more accurate. This is beneficial for the controller 9 to accurately adjust the working medium pressure. The sleeve rod 63 facilitates the installation of the cover spring 62. The setting of the inner groove ensures the stable limit of the cover spring 62. The inner wall of the piston sleeve 3 abuts against the filter cover 6, which helps to limit the movement of the filter cover 6.

[0053] In another embodiment of the invention, such as Figure 1 As shown, a transparent viewing window 23 is provided on the side wall of the liquid storage tank 2.

[0054] The transparent viewing window 23 facilitates observation of the blockage status of the filter 5 inside the liquid storage tank 2.

[0055] In another embodiment of the present invention, the filter 5 is a cylindrical filter screen with a through top and a bottom surface connected to the drain port 21 via a connecting pipe 51.

[0056] In another embodiment of the invention, such as Figures 4-6 As shown, the piston sleeve 3 includes a piston portion 31 at the upper end and a sliding portion 32 at the lower end. The inner and outer diameters of the sliding portion 32 are both smaller than the inner and outer diameters of the piston portion 31. The inner diameter of the lower end of the piston portion 31 is larger than the inner diameter of the piston portion 31 where the V-groove 35 is formed. The filter screen cover 6 includes an abutting sliding disc 64, a cover plate 65, and a sleeve rod 63. The abutting sliding disc 64 is located above the cover plate 65, which is positioned on top of the filter 5. The sleeve rod 63 is positioned between the abutting sliding disc 64 and the cover plate 65 and is coaxially arranged with both. The sleeve rod 63 is fixedly connected to the cover plate 65 and the abutting sliding disc 64 and passes upward through the abutting sliding disc 64. The abutting sliding disc 64 slides in contact with the lower end of the piston portion 31. Reinforcing ribs are provided on the sleeve rod 63 between the cover plate 65 and the abutting sliding disc 64.

[0057] The sliding part 32 mainly cooperates with the sliding hole 41 to realize the movement of the piston sleeve 3 at the guide groove 4. The setting of the cover plate 65 and the abutting sliding plate 64 is beneficial to improve the stability of the filter cover 6 and ensure that the filter cover 6 can move better up and down. The sleeve rod 63 is used to stabilize and connect the cover plate 65 and the abutting sliding plate 64.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency arc discharge machining working medium filtration device, characterized in that, The filter includes a liquid storage tank detachably mounted at the lower end of the filter base. The filter base has an inlet and an outlet on its side wall. The filter base has a piston cavity formed inside. A piston sleeve is slidably fitted inside the piston cavity. The outer wall of the piston sleeve is slidably sealed to the inner wall of the piston cavity. The inner wall of the piston sleeve has several outlet holes. A liquid passage cavity is formed between the outlet holes and the outlet and is connected through the liquid passage cavity. The upper end of the liquid storage tank is fitted with a disc-shaped guide groove, the outer wall of which is tightly fitted with the inner wall of the liquid storage tank. A sliding hole is provided in the center of the guide groove, which is slidably sealed with the lower end of the piston sleeve. Several through holes are provided on the guide groove, which connect the liquid inlet to the liquid storage tank. The liquid outlet is isolated from the through holes by the piston sleeve. A filter is fitted through the sliding hole at the lower end of the piston sleeve. The top of the filter is connected to the piston sleeve. A filter screen cover is provided inside the piston sleeve. The lower end of the filter screen cover seals the upper opening of the filter. A spring baffle is provided above the filter screen cover. A cover spring is provided between the spring baffle and the filter screen cover. A lifting drive device is provided at the top of the filter seat. The output end of the lifting drive device extends downward into the filter seat and connects with the spring baffle. A piston spring is provided between the top of the piston sleeve and the top of the piston chamber. A drain port is provided at the lower end of the liquid storage tank. A sealing cap is provided outside the drain port. A connecting pipe is provided at the lower end of the filter. The connecting pipe is slidably and sealingly connected to the drain port. The length of the connecting pipe is less than the range of motion of the piston sleeve.

2. The high-efficiency arc discharge machining working medium filtration device according to claim 1, characterized in that, The top sidewall of the piston sleeve is formed with a V-shaped groove, and the liquid outlet is opened on the V-shaped groove. The liquid outlet is connected to the liquid outlet through the piston cavity. A piston baffle is provided between the piston cavity and the liquid inlet to seal the connection between the liquid inlet and the through hole.

3. The high-efficiency arc discharge machining working medium filtration device according to claim 2, characterized in that, Both the inlet and outlet are connected to threaded connectors.

4. The high-efficiency arc discharge machining working medium filtration device according to claim 3, characterized in that, A pressure transmitter is provided on the threaded connector of the liquid outlet, and the pressure transmitter is connected to a controller, which is connected to the lifting drive device.

5. The high-efficiency arc discharge machining working medium filtration device according to claim 4, characterized in that, The lifting drive device is a linear screw motor. The top of the filter seat has a threaded hole for the screw to pass through. The screw of the linear screw motor passes through the threaded hole and connects to the spring baffle. The spring baffle has a cap-like structure with a cylindrical groove on its small surface. The top of the pressure cap spring is placed in the inner groove of the spring baffle. The upper edge of the filter screen pressure cap abuts against the inner wall of the piston sleeve. A sleeve rod is provided at the center of the top of the filter screen pressure cap. The lower end of the pressure cap spring is sleeved on the sleeve rod.

6. The high-efficiency arc discharge machining working medium filtration device according to claim 1, characterized in that, The storage tank has a transparent viewing window on its side wall.

7. The high-efficiency arc discharge machining working medium filtration device according to claim 1, characterized in that, The filter is a cylindrical filter screen with a through top and a bottom surface connected to the drain port via a connecting pipe.

8. The high-efficiency arc discharge machining working medium filtration device according to claim 5, characterized in that, The piston sleeve includes a piston portion at the upper end and a sliding portion at the lower end. The inner and outer diameters of the sliding portion are both smaller than the inner and outer diameters of the piston portion. The inner diameter of the lower end of the piston portion is larger than the inner diameter of the piston portion where the V-groove is formed. The filter screen cover includes an abutting sliding disc, a cover plate, and a sleeve rod. The abutting sliding disc is located above the cover plate. The cover plate is disposed on the top of the filter. The sleeve rod is disposed between the abutting sliding disc and the cover plate and is coaxially arranged with both. The sleeve rod is fixedly connected to the cover plate and the abutting sliding disc and passes upward through the abutting sliding disc. The abutting sliding disc is slidably engaged with the lower end of the piston portion.

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