Method and apparatus for cleaning deep blind hole parts

Abstract

This invention belongs to the field of parts cleaning technology, specifically a method and apparatus for cleaning deep blind hole parts. The method includes the following steps: S1, placing the deep blind hole part into a cleaning chamber and sealing the chamber; S2, evacuating the cleaning chamber; S3, injecting cleaning fluid into the cleaning chamber; S4, increasing the internal pressure of the cleaning chamber to a first pressure; S5, controlling the internal pressure of the cleaning chamber to cycle periodically, each cycle including a first pressure maintenance period, a pressure decrease period, a second pressure maintenance period, and a pressure increase period; during the first pressure maintenance period, an ultrasonic transmitting mechanism sends high-frequency ultrasonic waves with alternating frequencies to the cleaning fluid; during the latter half of the pressure decrease period, the ultrasonic transmitting mechanism emits low-frequency ultrasonic waves. This invention enables the active removal of impurities, preventing detached impurities from remaining in the deep blind hole and re-adhering to the hole wall, thus improving the cleaning effect.

Description

Technical Field

[0001] This invention belongs to the field of parts cleaning technology, and in particular to a method and apparatus for cleaning deep blind hole parts. Background Technology

[0002] After gear machining, cleaning is required to remove impurities. Some gears, shafts, and other parts have deep blind hole structures (length-to-diameter ratio greater than 8), such as hollow gear shaft holes, deep oil holes for tooth root lubrication, internal oil passage holes for new energy reducer gears, and cross blind holes. The inner walls of deep blind holes are prone to retaining impurities such as metal shavings, grinding powder, quenching oil coke, and sludge. If cleaning is not thorough, these impurities will be sprayed out of the hole under centrifugal force when the gear is running at high speed, affecting the normal operation of the equipment and accelerating wear.

[0003] Conventional cleaning methods include high-pressure jet cleaning and ultrasonic cleaning. High-pressure jet cleaning relies on the impact of high-pressure water jets on the borehole walls to remove impurities. However, the pressure drops rapidly as the water flows through narrow, deep boreholes, and the impact force decreases significantly when it reaches the bottom of the borehole and blind corners, making it ineffective at removing stubborn impurities. Ultrasonic cleaning utilizes the cavitation effect of ultrasonic waves to remove impurities, but it has the following problems: 1. When ultrasonic waves enter a deep blind hole, they are reflected back when they reach the bottom of the hole. The bottom of the hole may be at a standing wave node. The reflected wave and the incident wave are superimposed to form a standing wave, which causes the cavitation intensity at the bottom of the hole to be close to 0, resulting in almost no cleaning effect.

[0004] 2. The exchange of cleaning fluid inside and outside the deep blind hole is difficult. The impurity content of the cleaning fluid inside the deep blind hole continues to increase. The stripped impurities cannot be discharged in time and may re-adhere to the inner wall of the deep blind hole.

[0005] In addition, ultrasonic cleaning always has the problem that the cleaning fluid has difficulty effectively penetrating deep blind holes, especially reaching the bottom of the hole. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method and apparatus for cleaning deep blind hole parts, which is used to clean high-precision parts with deep blind hole structures (such as gears of new energy vehicle reducers, planetary gears of gearboxes and valve body gears). It can promote the entry of cleaning fluid into the deep blind hole and improve the cavitation effect at the bottom of the hole, thereby promoting the discharge of impurities.

[0007] To solve the above problems, the technical solution adopted by the present invention is: a method for cleaning deep blind hole parts, comprising the following steps: Cleaning method for deep blind hole parts includes the following steps: S1. Place the deep blind hole part into the cleaning chamber and seal the cleaning chamber; S2. Evacuate the cleaning chamber to 0.01-0.03 MPa; S3. Inject cleaning fluid into the cleaning chamber, and completely immerse the deep blind hole parts in the cleaning fluid; S4. Increase the pressure inside the cleaning chamber to the first pressure; S5. Control the pressure cycle inside the cleaning chamber. Each cycle includes a first pressure maintenance period, a pressure drop period, a second pressure maintenance period, and a pressure rise period. The second pressure is lower than the first pressure. During the first pressure maintenance period, high-frequency ultrasonic waves with alternating frequencies are sent to the cleaning fluid using an ultrasonic transmitting mechanism to generate a cavitation effect and remove impurities from the inner wall of the deep blind hole. During the latter half of the pressure drop phase, the ultrasonic transmitting mechanism emits low-frequency ultrasonic waves to generate microbubbles within the deep blind hole. As the pressure decreases, the microbubbles expand, pushing some of the cleaning fluid in the deep blind hole, carrying impurities, out of the hole.

[0008] Furthermore, the first pressure is 0.3 MPa, and the second pressure is 0.05 MPa.

[0009] Furthermore, in step S5, the pressure is increased by filling the cleaning chamber with air; and the pressure is decreased by evacuating the cleaning chamber.

[0010] Furthermore, in step S5, during the first pressure maintenance period, the ultrasonic transmitting mechanism alternately transmits high-frequency ultrasonic waves at frequencies of 40kHz and 80kHz, with a power density of 0.5-3W / cm²; during the latter half of the pressure decrease period, the ultrasonic transmitting mechanism transmits low-frequency ultrasonic waves at frequencies of 20-30kHz, with a power density of 0.2-0.8W / cm².

[0011] A deep blind hole parts cleaning device includes a cleaning chamber with a cleaning cavity, and the top of the cleaning chamber is provided with a removable sealing cover; The bottom of the cleaning chamber is connected to a cleaning fluid supply and drainage mechanism for injecting and discharging cleaning fluid; The cleaning chamber is connected to a pressure control mechanism. The pressure control mechanism is used to evacuate the cleaning chamber before the deep blind hole part is put into the cleaning chamber, and to increase the pressure inside the cleaning chamber to a first pressure after the deep blind hole part is put into the cleaning chamber. Then, the pressure inside the cleaning chamber is controlled to cycle. Each cycle includes a first pressure maintenance period, a pressure drop period, a second pressure maintenance period, and a pressure rise period. The second pressure is less than the first pressure. The cleaning chamber is equipped with an ultrasonic transmitting mechanism, which sends high-frequency ultrasonic waves with alternating frequencies to the cleaning fluid during the first pressure maintenance period and emits low-frequency ultrasonic waves during the latter half of the pressure drop period.

[0012] Furthermore, a positioning plate is provided in the cleaning chamber, and multiple part positioning mechanisms are provided on the positioning plate. After the part positioning mechanism positions the part, the deep blind hole of the part is horizontally facing the side wall of the cleaning chamber; the ultrasonic emitting mechanism is installed on the side wall of the cleaning chamber. The positioning disk is connected to a rotation drive mechanism. During the first pressure maintenance period, the rotation drive mechanism drives the positioning disk to rotate at a low speed, so that the deep blind holes of each part move sequentially to a position coaxial with the ultrasonic emitting mechanism. During the second pressure maintenance period, the rotation drive mechanism drives the positioning disk to rotate at a high speed, so that the impurities stripped from the deep blind holes are discharged from the deep blind holes under the action of centrifugal force.

[0013] Furthermore, the rotation drive mechanism includes a vertical rotating shaft, the upper end of which is fixedly connected to the positioning plate, and the lower end extends to the outside of the cleaning room and is connected to a drive motor.

[0014] Furthermore, a detachable flexible collection bag is provided at the bottom of the inner side wall of the cleaning chamber, with the opening of the flexible collection bag facing the radial direction perpendicular to the cleaning chamber. When the positioning plate rotates at high speed, it drives the cleaning fluid to generate a swirling flow, and the direction of the swirling flow is opposite to the direction of the opening of the flexible collection bag, so that the cleaning fluid enters the flexible collection bag, and the flexible collection bag collects and filters out impurities in the cleaning fluid.

[0015] Furthermore, the cleaning fluid supply and discharge mechanism includes a storage chamber. The inner cavity of the storage chamber is divided into a first storage chamber and a second storage chamber by a vertical partition. The lower end of the partition is provided with a plurality of filter holes that connect the first storage chamber and the second storage chamber. The bottom of the first storage chamber and the middle part of the second storage chamber are respectively connected to a delivery pump through a supply pipe and a recovery pipe. A supply check valve is provided on the supply pipe, and a recovery check valve and a demulsifier addition mechanism are provided on the recovery pipe. The delivery pump is connected to the bottom of the cleaning chamber through a pipeline.

[0016] The beneficial effects of this invention are as follows: 1. Because one end of the deep blind hole is closed, the air inside the hole is difficult to escape under normal pressure, forming an air cushion that hinders the entry of cleaning fluid. By evacuating the cleaning chamber to 0.01-0.03 MPa, the air in the deep blind hole can also be extracted, making the inside of the deep blind hole negative pressure, eliminating air blockage, and reducing the inherent number of air bubbles in the deep blind hole, thus reducing the attenuation effect on ultrasound. After the cleaning fluid is injected, by increasing the pressure inside the cleaning chamber, the cleaning fluid can be forced into the deep blind hole, ensuring that the cleaning fluid is in full contact with the sidewalls and bottom of the deep blind hole.

[0017] 2. During the first pressure maintenance period, the pressure is relatively high, and the number of bubbles generated by the cavitation effect is less (compared to atmospheric pressure). However, the micro-jet and shock wave formed when the cavitation bubbles collapse under high pressure are greatly enhanced, thereby more effectively stripping away stubborn impurities and ensuring the cleaning effect at the bottom of the deep blind hole.

[0018] During the latter half of the pressure reduction phase, the ultrasonic transmitting mechanism emits low-frequency ultrasonic waves, generating microbubbles within the deep blind hole. These low-frequency ultrasonic bubbles are more stable and less prone to collapse. As the pressure decreases, the microbubbles gradually expand, increasing in volume and thus pushing some of the cleaning fluid out of the deep blind hole. The cleaning fluid carries away the detached impurities as it exits. Therefore, this invention enables the active removal of impurities, preventing detached impurities from remaining in the deep blind hole and re-adhering to the hole wall, thereby improving the cleaning effect. When the pressure subsequently rises to the first pressure, the microbubbles shrink, partially dissolve, and partially collapse, without affecting the impurity removal effect. At this time, the external cleaning fluid re-enters the deep blind hole, achieving fluid exchange between the inside and outside of the hole and reducing the impurity concentration in the cleaning fluid within the deep blind hole.

[0019] 3. An ultrasonic transmitting mechanism is used to send high-frequency ultrasonic waves with alternating frequencies to the cleaning fluid. The alternating frequency changes the wavelength of the ultrasonic waves, preventing the formation of fixed standing wave nodes and eliminating cleaning dead zones. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cleaning process for deep blind hole parts according to the present invention; Figure 2 This is a front view schematic diagram of the deep blind hole parts cleaning device of the present invention; Figure 3 yes Figure 2 Schematic diagram of section AA; Reference numerals: 1—Cleaning chamber; 2—Ultrasonic emission mechanism; 3—Cleaning room; 4—Sealing cover; 5—Positioning plate; 6—Rotating shaft; 7—Drive motor; 8—Flexible collection bag; 9—Reservoir; 10—Baffle; 11—First reservoir; 12—Second reservoir; 13—Supply pipe; 14—Recovery pipe; 15—Transfer pump; 16—Supply check valve; 17—Recovery check valve; 18—Demulsifier addition mechanism; 19—Vacuum pump; 20—Compressed air source. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] The deep blind hole part cleaning method of the present invention, such as Figure 1 As shown, it includes the following steps: S1. Place the deep blind hole part into the cleaning chamber 1 and seal the cleaning chamber 1.

[0023] S2. Evacuate the cleaning chamber 1 to 0.01-0.03 MPa. During evacuation, the air in the cleaning chamber 1 is extracted. Since the deep blind hole of the part is connected to the cleaning chamber 1, the air in the deep blind hole is also extracted, resulting in negative pressure in both the deep blind hole and the cleaning chamber 1, thus eliminating the air column in the deep blind hole.

[0024] S3. Inject cleaning fluid into cleaning chamber 1, ensuring the deep blind hole parts are completely immersed in the cleaning fluid. Any existing conventional cleaning fluid can be used. During the injection of cleaning fluid, maintain the pressure inside cleaning chamber 1 at 0.01-0.03 MPa. A vacuum can be continuously pumped to remove any air that may have been introduced during the injection of cleaning fluid, thus maintaining the pressure inside cleaning chamber 1.

[0025] S4. Increase the internal pressure of cleaning chamber 1 to the first pressure. This can be achieved by injecting air into cleaning chamber 1 to increase the pressure. The first pressure is higher than atmospheric pressure. Under this higher pressure, the cleaning fluid can be forced into the deep blind hole, ensuring that the cleaning fluid makes full contact with the sidewalls and bottom of the deep blind hole.

[0026] S5. Control the internal pressure of cleaning chamber 1 to cycle. Each cycle includes a first pressure holding period, a pressure decrease period, a second pressure holding period, and a pressure increase period, with the second pressure being lower than the first pressure. The first pressure holding period is approximately 1 second, the pressure decrease and pressure increase periods are approximately 0.5 seconds each, and the second pressure holding period is approximately 0.3 seconds. During the pressure decrease and pressure increase periods, no ultrasonic waves are emitted. This process is repeated to achieve a cyclical pulsation of internal pressure in cleaning chamber 1 between the first and second pressures.

[0027] The second pressure is lower than atmospheric pressure; specifically, the first pressure is 0.3 MPa and the second pressure is 0.05 MPa. The pressure can be increased to the first pressure by filling the cleaning chamber 1 with air, and decreased to the second pressure by evacuating the cleaning chamber 1.

[0028] During the initial pressure maintenance period, the ultrasonic transmitting mechanism 2 sends alternating high-frequency ultrasonic waves to the cleaning fluid, generating a cavitation effect to remove impurities from the inner wall of the deep blind hole. The initial pressure is high, resulting in fewer bubbles generated by the cavitation effect (compared to atmospheric pressure). However, under high pressure, the micro-jet streams and shock waves formed when the cavitation bubbles collapse are significantly enhanced, thus more effectively removing stubborn impurities and ensuring a clean bottom for the deep blind hole. To ensure the cavitation effect is generated under high pressure, high-frequency ultrasonic waves with high power density are used. Specifically, the ultrasonic transmitting mechanism 2 alternately emits high-frequency ultrasonic waves at 40kHz and 80kHz, with a power density of 0.5-3W / cm². Different ultrasonic frequencies have different wavelengths and standing wave node positions; using two ultrasonic frequencies prevents the formation of fixed standing wave nodes and eliminates cleaning dead zones.

[0029] In the latter half of the pressure drop phase (accounting for half of the total pressure drop period), the ultrasonic transmitting mechanism 2 emits low-frequency ultrasonic waves to generate microbubbles within the deep blind hole. As the pressure continues to decrease, the microbubbles expand, pushing some of the cleaning fluid in the deep blind hole, carrying impurities, out of the hole. During this phase, the ultrasonic waves are not used for cleaning but rather to generate stable bubbles. The bubbles generated by the low-frequency ultrasonic waves are more stable and less prone to collapse. Specifically, the ultrasonic transmitting mechanism 2 emits low-frequency ultrasonic waves with a radio frequency of 20-30 kHz and a power density of 0.2-0.8 W / cm². As the pressure decreases, the microbubbles gradually expand, increasing in volume, thereby pushing some of the cleaning fluid out of the deep blind hole. When the cleaning fluid is discharged, it carries away the detached impurities. Therefore, this invention can achieve active removal of impurities, preventing detached impurities from remaining in the deep blind hole and re-adhering to the hole wall, thus improving the cleaning effect. When the pressure rises to the first pressure, the microbubbles shrink, partially dissolve, and partially collapse, without affecting the impurity removal effect. At this time, the external cleaning fluid re-enters the deep blind hole, realizing the exchange of cleaning fluid inside and outside the deep blind hole and reducing the impurity concentration in the cleaning fluid inside the deep blind hole.

[0030] The deep blind hole part cleaning device of the present invention, such as Figure 2 and Figure 3 As shown, the device includes a cleaning chamber 3 with a cleaning cavity 1, and a removable sealing cover 4 is provided on the top of the cleaning chamber 3. The cleaning chamber 3 is a pressure vessel with good sealing performance, and its shape is circular. The inner cavity of the cleaning chamber 3 is the cleaning cavity 1. The sealing cover 4 can be installed and sealed using conventional sealing container installation methods.

[0031] The bottom of the cleaning chamber 3 is connected to a cleaning fluid supply and discharge mechanism for injecting and discharging cleaning fluid.

[0032] The cleaning chamber 3 is connected to a pressure control mechanism. This mechanism evacuates the cleaning chamber 1 before the deep blind hole part is placed inside, and increases the internal pressure of the cleaning chamber 1 to a first pressure after the part is placed inside. The mechanism then controls the internal pressure of the cleaning chamber 1 to cycle periodically. Each cycle includes a first pressure maintenance period, a pressure decrease period, a second pressure maintenance period, and a pressure increase period, where the second pressure is lower than the first pressure. Specifically, the pressure control mechanism may include a vacuum pump 19 and a compressed air source 20. The vacuum pump 19 evacuates the cleaning chamber 1, and the compressed air source 20 fills the cleaning chamber 1 with air, thereby increasing the pressure. A pressure gauge can be installed on the cleaning chamber 3 for real-time pressure monitoring.

[0033] The cleaning chamber 3 is equipped with an ultrasonic transmitting mechanism 2, which is used to send high-frequency ultrasonic waves with alternating frequencies to the cleaning fluid during the first pressure maintenance period and to transmit low-frequency ultrasonic waves during the latter half of the pressure drop period.

[0034] When using, first put the deep blind hole part into the cleaning chamber 1, then put on the sealing cover 4 to complete step S1; Then, the cleaning chamber 1 is evacuated to 0.01-0.03 MPa using a pressure control mechanism to complete step S2; Then, the cleaning fluid is injected into the cleaning chamber 1 using the cleaning fluid supply and drainage mechanism, and the deep blind hole parts are completely immersed in the cleaning fluid, thus completing step S3; Then, the pressure inside the cleaning chamber 1 is increased to the first pressure using the pressure control mechanism to complete step S4; Finally, the internal pressure of the cleaning chamber 1 is controlled to cycle. Each cycle includes a first pressure maintenance period, a pressure drop period, a second pressure maintenance period, and a pressure rise period, with the second pressure being lower than the first pressure. During the first pressure maintenance period, high-frequency ultrasonic waves with alternating frequencies are sent to the cleaning fluid using the ultrasonic transmitting mechanism 2 to generate a cavitation effect and remove impurities from the inner wall of the deep blind hole. During the latter half of the pressure drop phase, the ultrasonic transmitting mechanism 2 emits low-frequency ultrasonic waves to generate microbubbles within the deep blind hole. As the pressure decreases, the microbubbles expand, pushing some of the cleaning fluid in the deep blind hole, carrying impurities, out of the hole. This process is repeated multiple times to complete step S5.

[0035] Generally, the cleaning effect is best when the ultrasonic wave emission direction is towards the deep blind hole and is coaxial with the deep blind hole. In this invention, a positioning plate 5 is provided inside the cleaning chamber 3. The positioning plate 5 is horizontally positioned and has multiple part positioning mechanisms. The part positioning mechanisms are used to fix the parts on the positioning plate 5, and a conventional clamping and fixing structure is sufficient. After the part positioning mechanisms position the parts, the deep blind hole of the part is horizontally oriented towards the side wall of the cleaning chamber 3, that is, the axis of the deep blind hole is consistent with the radial direction of the cleaning chamber 3. The ultrasonic emission mechanism 2 is installed on the side wall of the cleaning chamber 3, and the ultrasonic wave emitted by the ultrasonic emission mechanism 2 is consistent with the radial direction of the cleaning chamber 3. There can be two or three ultrasonic emission mechanisms 2. When there are two ultrasonic emission mechanisms 2, the ultrasonic wave emission direction is perpendicular; when there are three ultrasonic emission mechanisms 2, the included angle between the ultrasonic waves emitted by two adjacent ultrasonic emission mechanisms 2 is 60°.

[0036] The positioning disk 5 is connected to a rotation drive mechanism, which includes a vertical rotating shaft 6. The upper end of the rotating shaft 6 is fixedly connected to the positioning disk 5, and the lower end extends to the outside of the cleaning chamber 3 and is connected to a drive motor 7. The rotating shaft 6 is sealed to the cleaning chamber 3 to prevent liquid and air leakage. When the drive motor 7 rotates, it can drive the positioning disk 5 to rotate through the rotating shaft 6, thereby driving the parts fixed on the upper surface of the positioning disk 5 to rotate.

[0037] During the first pressure maintenance period, the rotary drive mechanism drives the positioning disk 5 to rotate at a low speed of 60-100 r / min, causing the deep blind holes of each part to move sequentially to a position coaxial with the ultrasonic transmitting mechanism 2. This ensures that, for a certain period, ultrasonic waves can propagate directly into the deep blind holes of each part in a straight line, effectively cleaning them. During the second pressure maintenance period, the rotary drive mechanism drives the positioning disk 5 to rotate at a high speed of 500-1000 r / min, causing the impurities removed from the deep blind holes to be discharged under centrifugal force. Simultaneously, this also promotes the discharge of cleaning fluid from the deep blind holes, improving the exchange effect of cleaning fluid inside and outside the holes.

[0038] A detachable flexible collection bag 8 is installed at the bottom of the inner wall of the cleaning chamber 3. The flexible collection bag 8 can include a flexible, water-permeable bag body. The opening of the water-permeable bag body can be opened using a steel wire ring to keep the water-permeable bag body open, allowing impurities to enter. The flexible collection bag 8 can be installed magnetically, that is, a magnetic block with magnetism is fixedly embedded in the inner wall of the cleaning chamber 3, and an iron block is placed at the opening of the flexible collection bag 8, which is magnetically connected to the magnetic block. The opening of the flexible collection bag 8 is perpendicular to the radial direction of the cleaning chamber 3, that is, the opening of the flexible collection bag 8 is tangential to the cleaning chamber 1. When the positioning disk 5 rotates at high speed, it drives the cleaning fluid to rotate, thereby generating a swirling flow. The direction of the swirling flow is opposite to the opening direction of the flexible collection bag 8, allowing the cleaning fluid to enter the flexible collection bag 8. The flexible collection bag 8 collects and filters out impurities in the cleaning fluid. It can be seen that the flexible collection bag 8 can capture impurities in the cleaning fluid in real time, preventing the concentration of impurities from gradually increasing and affecting the cleaning effect. Every once in a while, the old flexible collection bag 8 can be removed and a new flexible collection bag 8 can be installed.

[0039] In this invention, to achieve the reuse of the cleaning fluid, the cleaning fluid supply and discharge mechanism includes a storage chamber 9. The inner cavity of the storage chamber 9 is divided into a first storage chamber 11 and a second storage chamber 12 by a vertical partition 10. The lower end of the partition 10 is provided with a plurality of filter holes connecting the first storage chamber 11 and the second storage chamber 12. The bottom of the first storage chamber 11 and the middle part of the second storage chamber 12 are respectively connected to a delivery pump 15 through a supply pipe 13 and a recovery pipe 14. A supply check valve 16 is provided on the supply pipe 13, and the conduction direction of the supply check valve 16 is the first... A storage chamber 11 leads to a delivery pump 15. A recovery check valve 17 and a demulsifier addition mechanism 18 are installed on the recovery pipe 14. The recovery check valve 17 is open from the delivery pump 15 to the second storage chamber 12. When the delivery pump 15 rotates forward, it can deliver the cleaning fluid from the first storage chamber 11 to the cleaning chamber 1, while the cleaning fluid in the second storage chamber 12 cannot reach the delivery pump 15. When the delivery pump 15 rotates in reverse, it delivers the cleaning fluid from the cleaning chamber 1 to the second storage chamber 12, and the cleaning fluid in the cleaning chamber 1 will not enter the first storage chamber 11. The delivery pump 15 is connected to the bottom of the cleaning chamber 1 via a pipe.

[0040] After each batch of parts is cleaned, the cleaning fluid in the cleaning chamber 1 is transported to the recovery pipe 14 via the transfer pump 15. Under ultrasonic action, oil and other contaminants on the parts mix and emulsify with the cleaning fluid, making them difficult to separate. Therefore, a demulsifier adding mechanism 18 is installed on the recovery pipe 14 to add demulsifier to the cleaning fluid to promote oil-water separation. Existing AP or AE type demulsifiers can be used. The cleaning fluid enters the middle of the second storage chamber 12 through the recovery pipe 14. Oil, with its lower density, floats to the top of the second storage chamber 12, while solid particles, with their higher density, settle to the bottom. The cleaning fluid at the bottom of the second storage chamber 12 then enters the first storage chamber 11 through a filter hole for reuse. Drain holes can be provided at the top and bottom of the second storage chamber 12 to periodically drain the oil from the top layer and the solid impurities from the bottom layer, and to periodically replenish the first storage chamber 11 with new cleaning fluid.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of cleaning a deep blind hole part, characterized by, Includes the following steps: S1. Place the deep blind hole part into the cleaning chamber (1) and seal the cleaning chamber (1); S2. Evacuate the cleaning chamber (1) to 0.01-0.03 MPa; S3. Inject cleaning fluid into the cleaning chamber (1) and immerse the deep blind hole parts completely in the cleaning fluid; S4. Increase the internal pressure of the cleaning chamber (1) to the first pressure; S5. Control the internal pressure cycle of the cleaning chamber (1). Each cycle includes a first pressure maintenance period, a pressure drop period, a second pressure maintenance period, and a pressure rise period. The second pressure is less than the first pressure. During the first pressure maintenance period, high-frequency ultrasonic waves with alternating frequencies are sent to the cleaning fluid using the ultrasonic transmitting mechanism (2) to generate a cavitation effect and remove impurities from the inner wall of the deep blind hole. During the latter half of the pressure drop period, the ultrasonic transmitting mechanism (2) emits low-frequency ultrasonic waves to generate microbubbles in the deep blind hole. As the pressure decreases, the microbubbles expand, pushing some of the cleaning fluid in the deep blind hole to carry impurities out of the deep blind hole.

2. The method of claim 1, wherein the deep blind hole part is cleaned by the method. The first pressure is 0.3 MPa, and the second pressure is 0.05 MPa.

3. The method of claim 1, wherein the deep blind hole part is cleaned by the method. In step S5, the pressure is increased by filling the cleaning chamber (1) with air; the pressure is decreased by evacuating the cleaning chamber (1).

4. The method of claim 1, wherein the deep blind hole part is cleaned by the method. In step S5, during the first pressure maintenance period, the ultrasonic transmitting mechanism (2) alternately transmits high-frequency ultrasonic waves at frequencies of 40kHz and 80kHz with a power density of 0.5-3W / cm²; during the latter half of the pressure drop period, the ultrasonic transmitting mechanism (2) transmits low-frequency ultrasonic waves at frequencies of 20-30kHz with a power density of 0.2-0.8W / cm².

5. A deep blind hole part cleaning apparatus characterized by, It includes a cleaning chamber (3) with a cleaning cavity (1), and a removable sealing cover (4) is provided on the top of the cleaning chamber (3). The bottom of the cleaning chamber (3) is connected to a cleaning fluid supply and discharge mechanism for injecting and discharging cleaning fluid; The cleaning chamber (3) is connected to a pressure control mechanism. The pressure control mechanism is used to evacuate the cleaning chamber (1) before the deep blind hole part is put into the cleaning chamber (1), and after the deep blind hole part is put into the cleaning chamber (1), the pressure inside the cleaning chamber (1) is increased to the first pressure, and then the pressure inside the cleaning chamber (1) is controlled to cycle. Each cycle includes a first pressure maintenance period, a pressure drop period, a second pressure maintenance period and a pressure rise period. The second pressure is less than the first pressure. The cleaning chamber (3) is equipped with an ultrasonic transmitting mechanism (2) for sending high-frequency ultrasonic waves with alternating frequencies to the cleaning fluid during the first pressure maintenance period and for transmitting low-frequency ultrasonic waves during the second half of the pressure drop period.

6. The deep blind hole part cleaning device as described in claim 5, characterized in that, The cleaning chamber (3) is equipped with a positioning plate (5), and multiple part positioning mechanisms are provided on the positioning plate (5). After the part positioning mechanism positions the part, the deep blind hole of the part is horizontally facing the side wall of the cleaning chamber (3); the ultrasonic emission mechanism (2) is installed on the side wall of the cleaning chamber (3). The positioning disk (5) is connected to a rotation drive mechanism. During the first pressure maintenance period, the rotation drive mechanism is used to drive the positioning disk (5) to rotate at a low speed, so that the deep blind holes of each part move sequentially to the position coaxial with the ultrasonic emitting mechanism (2). During the second pressure maintenance period, the rotation drive mechanism is used to drive the positioning disk (5) to rotate at a high speed, so that the impurities stripped from the deep blind holes are discharged from the deep blind holes under the action of centrifugal force.

7. The deep blind hole part cleaning device as described in claim 6, characterized in that, The rotation drive mechanism includes a vertical rotating shaft (6), the upper end of which is fixedly connected to the positioning plate (5), and the lower end extends to the outside of the cleaning chamber (3) and is connected to a drive motor (7).

8. The deep blind hole part cleaning device as described in claim 6, characterized in that, A detachable flexible collection bag (8) is provided at the bottom of the inner wall of the cleaning chamber (3). The opening of the flexible collection bag (8) is perpendicular to the radial direction of the cleaning chamber (3). When the positioning plate (5) rotates at high speed, it drives the cleaning liquid to generate a swirling flow. The swirling flow direction is opposite to the opening of the flexible collection bag (8), so that the cleaning liquid enters the flexible collection bag (8) and the flexible collection bag (8) collects and filters out impurities in the cleaning liquid.

9. The deep blind hole part cleaning device as described in claim 5, characterized in that, The cleaning fluid supply and discharge mechanism includes a storage chamber (9). The inner cavity of the storage chamber (9) is divided into a first storage chamber (11) and a second storage chamber (12) by a vertical partition (10). The lower end of the partition (10) is provided with a plurality of filter holes that connect the first storage chamber (11) and the second storage chamber (12). The bottom of the first storage chamber (11) and the middle part of the second storage chamber (12) are respectively connected to a delivery pump (15) through a supply pipe (13) and a recovery pipe (14). A supply check valve (16) is provided on the supply pipe (13), and a recovery check valve (17) and a demulsifier addition mechanism (18) are provided on the recovery pipe (14). The delivery pump (15) is connected to the bottom of the cleaning chamber (1) through a pipe.

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