Cleaning method and cleaning assembly line for hydraulic valve block

Abstract

The invention relates to the technical field of hydraulic valve block cleaning, in particular to a hydraulic valve block cleaning method and a cleaning assembly line. S1, a hydraulic valve block is placed on a conveying line through a fixing tool; s2, the hydraulic valve block is subjected to demagnetization treatment; s3, entering a high-pressure flushing unit, and performing high-pressure flushing on the opening of the hydraulic valve block; and S4, the hydraulic valve block enters a composite cleaning unit, spraying cleaning and ultrasonic cleaning are conducted on the hydraulic valve block through cleaning fluid, and then high-temperature drying is conducted. The hydraulic valve block cleaning tool has the beneficial effects that the hydraulic valve block is borne through the fixing tool, collision damage in the transferring process is avoided, and precise cleaning positioning is guaranteed; residual magnetism of the valve block is effectively removed through demagnetization treatment, iron scrap adsorption is reduced, and obstacles are cleared away for follow-up cleaning; stubborn impurities in open holes are removed in a targeted mode through high-pressure flushing, the surface of the valve block, deep holes and cavities can be completely covered through spraying and ultrasonic composite cleaning, and cleaning thoroughness is greatly improved; high-temperature drying is immediately carried out after spraying cleaning and ultrasonic cleaning, and secondary pollution or corrosion caused by water stain residues is avoided.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve block cleaning technology, and in particular to a cleaning method and cleaning production line for hydraulic valve blocks. Background Technology

[0002] Hydraulic valve blocks are core components of hydraulic systems, integrating complex oil passages, bores, and cavities. They primarily function to achieve critical objectives such as the installation and fixation of hydraulic components, the diversion and reversal of hydraulic oil, and pressure control. During the machining process, impurities such as iron filings, cutting fluid, and oil stains can easily remain in the internal passages, cavities, and surfaces of hydraulic valve blocks. If these impurities are not thoroughly removed, they can lead to problems such as valve core jamming, seal wear, and oil circuit blockage during subsequent assembly and use. This severely affects the operational accuracy, stability, and service life of the hydraulic system, and may even cause equipment failure. Therefore, the cleaning process after machining hydraulic valve blocks is a crucial step in ensuring product quality and the reliable operation of the hydraulic system.

[0003] In existing technologies, the cleaning of hydraulic valve blocks relies entirely on traditional manual operation. The entire process is scattered across different work areas, lacking standardized control and heavily dependent on the physical labor and personal experience of the operators. The specific operation method is as follows: Operators must manually move stainless steel valve blocks (ranging from 84mm to 640mm in length, 135mm in width, and 150mm in height) weighing nearly 100 kg to the cleaning area, placing them haphazardly on workbenches, the ground, or simple material racks. During the rough cleaning stage, 0.6MPa compressed air is used to blow out visible iron filings from the orifice system. For firmly attached filings, simple tools such as iron hooks and wires are used to manually remove them. This process generates dust, creating a harsh working environment and posing safety hazards. Subsequently, the valve blocks are placed in a container... The cleaning process involves immersing the metal in a cleaning agent tank, relying on experience to control the concentration and temperature of the cleaning solution, and manually brushing the inner and outer surfaces, holes, and cavities with a brush. The cleaning effect on invisible areas such as deep holes, intersecting holes, and blind holes cannot be guaranteed. During the rinsing stage, the parts must be manually moved to a clean or pure water tank for cleaning. Repeated lifting and turning result in high labor intensity and the risk of the workpiece slipping or being bumped. Drying is achieved by roughly blowing the surface with compressed air, while internal channels rely on natural air drying. The drying effect is judged by visual inspection and touch, leading to inconsistent standards and poor reliability, often resulting in water stains or scale residue in deep holes. Collisions are prone to occur during transport and placement, causing scratches and dents on the finished surfaces. Furthermore, the cleaning cycle for a single piece generally exceeds 30 minutes, requiring a skilled worker to perform the entire high-intensity operation.

[0004] Therefore, there is an urgent need for a cleaning method and cleaning production line for hydraulic valve blocks that can replace manual cleaning to achieve a higher degree of cleanliness. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a cleaning method and cleaning production line for hydraulic valve blocks, which solves the technical problem that the prior art requires manual cleaning of hydraulic valve blocks.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, embodiments of the present invention provide a cleaning method for a hydraulic valve block, comprising the following steps: S1, the hydraulic valve block is placed on a transport line by a fixing fixture; S2, the fixing fixture with the hydraulic valve block moves along the transport line and passes through a demagnetizing assembly to demagnetize the hydraulic valve block; S3, after demagnetization, the fixing fixture with the hydraulic valve block continues to move along the transport line and enters a high-pressure flushing unit to perform high-pressure flushing on the openings of the hydraulic valve block; S4, after high-pressure flushing, the fixing fixture with the hydraulic valve block continues to move along the transport line and enters a composite cleaning unit to perform spray cleaning and ultrasonic cleaning on the hydraulic valve block using cleaning fluid, followed by high-temperature drying in the composite cleaning unit.

[0010] Optionally, step S4 includes a spray cleaning step, an ultrasonic cleaning step, and a high-temperature drying step; the ultrasonic cleaning step includes: forming a vacuum environment in the composite cleaning unit, starting ultrasonic vibration of the cleaning fluid to generate cavitation bubbles in the cleaning fluid, and cleaning the hydraulic valve block with the cleaning fluid containing cavitation bubbles; the high-temperature drying step includes: discharging the cleaning fluid in the composite cleaning unit, passing hot air into the composite cleaning unit to heat the hydraulic valve block to a preset temperature, and then drawing a vacuum in the composite cleaning unit to form a vacuum environment. During the vacuuming process, the internal air pressure of the composite cleaning unit decreases, and at the same time, the boiling point of the cleaning fluid remaining on the hydraulic valve block decreases, causing the cleaning fluid on the hydraulic valve block to boil, vaporize, and be extracted.

[0011] Optionally, step S3 further includes: a clamping frame is provided in the high-pressure flushing unit to clamp the fixed fixture and flush the opening of the hydraulic valve block; step S4 further includes:

[0012] The composite cleaning unit is equipped with a bracket that clamps the fixed fixture. During the spray cleaning and ultrasonic cleaning steps, the bracket can drive the fixed fixture to swing circumferentially.

[0013] Optionally, in step S4: the spray cleaning step includes jet spray cleaning and surge spray cleaning performed sequentially; jet spray cleaning involves the nozzles in the composite cleaning unit spraying cleaning fluid onto the hydraulic valve block; surge spray cleaning involves the nozzles in the composite cleaning unit spraying cleaning fluid, and as the bracket drives the fixed fixture to swing circumferentially, the hydraulic valve block impacts the cleaning fluid accumulated in the composite cleaning unit, thereby flushing the hydraulic valve block.

[0014] Optionally, the process also includes step S5: the fixed fixture with the hydraulic valve block continues to move along the conveyor line, passing an axial fan, which cools the high-temperature dried hydraulic valve block.

[0015] Secondly, embodiments of the present invention provide a cleaning production line for hydraulic valve blocks, used to perform a cleaning method for hydraulic valve blocks. The cleaning production line includes a fixed fixture, a transport line, a demagnetizing assembly, a high-pressure rinsing unit, and a composite cleaning unit. The demagnetizing assembly, the high-pressure rinsing unit, and the composite cleaning unit are arranged sequentially along the transport line. The fixed fixture is used to clamp the hydraulic valve block and drive the hydraulic valve block to move along the transport line. The demagnetizing assembly is used to demagnetize the hydraulic valve block. The high-pressure rinsing unit is used to perform high-pressure rinsing on the openings of the hydraulic valve block. The composite cleaning unit is used to perform spray cleaning, ultrasonic cleaning, and high-temperature drying on the hydraulic valve block.

[0016] Optionally, the high-pressure flushing unit includes a sealed box, a five-axis CNC system, a high-pressure spray gun, and a nozzle magazine. The five-axis CNC system is located inside the sealed box, the high-pressure spray gun is fixed on the spindle of the five-axis CNC system, and the nozzle magazine is set on the spindle of the five-axis CNC system. The high-pressure spray gun is driven by the spindle of the five-axis CNC system, which is suitable for flushing the openings on the hydraulic valve block.

[0017] Optionally, the composite cleaning unit includes a housing, a driver, a bracket, a nozzle, a nozzle, a drain pipe, and an ultrasonic component; the driver is fixed to one end of the housing, and the output shaft of the driver extends into the housing; the driver is connected to the bracket; the bracket clamps and fixes the fixture; the nozzle and nozzle are located on opposite sides of the inner wall of the housing; the ultrasonic component is installed on the bottom and side walls of the housing; and the drain pipe is connected to the bottom of the housing.

[0018] Optionally, the composite cleaning unit also includes a vacuum tube and heating tubes; the vacuum tube is located above and connected to the chamber, and two heating tubes are located above and connected to the chamber, and are connected to the chamber through the two heating tubes to heat the hydraulic valve block; during the vacuuming process of the chamber through the vacuum tube, the cavitation threshold inside the chamber can be reduced during ultrasonic cleaning, and the boiling point of the cleaning fluid can be reduced, and the gas inside the chamber can be collected through the vacuum tube.

[0019] Optionally, the fixed fixture includes four fixed seats, a fixed frame, a sliding frame, a slide rail, and a base plate. Two fixed seats are fixed to two opposing fixed frames, and the other two fixed seats are fixed to the sliding frame. The four fixed seats are distributed at the four corners of a rectangle. The sliding frame is connected above the slide rail. A through hole is opened in the middle of the base plate, and two slide rails are fixed to both sides of the through hole in the base plate to expose the bottom surface of the hydraulic valve block. The sliding frame includes a frame body and two sliders. The cross-section of both the slide rail and the sliders is inverted T-shaped. The sliders are embedded in the slide rails. The frame body and the sliders are connected by bolt threads to facilitate switching between a fixed state and a sliding state. When the sliders are in the sliding state, the bolts are loose, and the frame body and the sliders form an anti-detachment connection through the bolts. The sliding connection between the sliding frame and the slide rail facilitates the four fixed seats being located at the four corners of the hydraulic valve block. When the sliders are in the fixed state, the bolts are tightened, and the frame body and the sliders clamp the slide rail through the bolts. The sliding frame is fixedly connected to the slide rail to facilitate the four fixed seats being clamped at the four corners of the top surface of the hydraulic valve block.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of this invention are:

[0022] This invention provides a cleaning method for a hydraulic valve block, comprising the following steps: S1, the hydraulic valve block is placed on a transport line using a fixing fixture; S2, the fixing fixture with the hydraulic valve block moves along the transport line past a demagnetizing assembly to demagnetize the hydraulic valve block; S3, after demagnetization, the fixing fixture with the hydraulic valve block continues to move along the transport line and enters a high-pressure flushing unit to perform high-pressure flushing on the openings of the hydraulic valve block; S4, after high-pressure flushing, the fixing fixture with the hydraulic valve block continues to move along the transport line and enters a composite cleaning unit to perform spray cleaning and ultrasonic cleaning on the hydraulic valve block using cleaning fluid, followed by high-temperature drying in the composite cleaning unit. Compared to existing technologies, this method uses fixed fixtures to support the hydraulic valve block, avoiding damage during transport and ensuring precise cleaning positioning. Demagnetization effectively removes residual magnetism from the valve block, reducing iron filings and clearing obstacles for subsequent cleaning. High-pressure rinsing specifically removes stubborn impurities from the openings, while combined spray and ultrasonic cleaning comprehensively covers the valve block surface, deep holes, and cavities, significantly improving cleaning thoroughness. High-temperature drying immediately after spray and ultrasonic cleaning prevents water residue from causing secondary pollution or corrosion. The fully automated process requires no manual intervention, reducing labor intensity and improving cleaning efficiency and consistency, effectively ensuring the reliability of subsequent assembly of the hydraulic valve block and the operation of the hydraulic system.

[0023] Another aspect of the present invention provides a cleaning production line for hydraulic valve blocks, used to perform a cleaning method for hydraulic valve blocks. The cleaning production line includes a fixed fixture, a transport line, a demagnetizing assembly, a high-pressure rinsing unit, and a composite cleaning unit. The demagnetizing assembly, high-pressure rinsing unit, and composite cleaning unit are arranged sequentially along the transport line. The fixed fixture is used to clamp the hydraulic valve block and drive the hydraulic valve block to move along the transport line. The demagnetizing assembly is used to demagnetize the hydraulic valve block. The high-pressure rinsing unit is used to perform high-pressure rinsing on the openings of the hydraulic valve block. The composite cleaning unit is used to perform spray cleaning, ultrasonic cleaning, and high-temperature drying on the hydraulic valve block. Compared with the prior art, the demagnetizing assembly, high-pressure rinsing unit, and composite cleaning unit are arranged sequentially along the transport line, and together with the fixed fixture, they drive the valve block to move automatically without manual intervention, greatly reducing labor intensity. Demagnetization effectively removes residual magnetism from the valve block and reduces iron filings adsorption; high-pressure rinsing specifically removes stubborn impurities from the openings; combined spraying and ultrasonic cleaning can fully cover the valve block surface, deep holes, and cavities; high-temperature drying is performed immediately after spraying and ultrasonic cleaning to avoid water residue causing secondary pollution or corrosion, significantly improving the thoroughness and stability of cleaning, and ensuring the assembly quality of the hydraulic valve block and the reliability of the hydraulic system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cleaning method for the hydraulic valve block in Example 1;

[0025] Figure 2 for Figure 1 A top view of the cleaning line for hydraulic valve blocks is shown;

[0026] Figure 3 for Figure 1 A schematic diagram of the internal structure of a composite cleaning unit in a hydraulic valve block cleaning production line, shown from one perspective.

[0027] Figure 4 for Figure 1 Another perspective structural diagram of the interior of the composite cleaning unit in the hydraulic valve block cleaning production line.

[0028] Figure 5 for Figure 1 Another perspective structural diagram of the interior of the composite cleaning unit in the hydraulic valve block cleaning production line.

[0029] Figure 6 for Figure 1 Another perspective structural diagram of the interior of the composite cleaning unit in the hydraulic valve block cleaning production line.

[0030] Figure 7 for Figure 1 A partial structural schematic diagram of the high-pressure flushing unit in the hydraulic valve block cleaning production line is shown.

[0031] Figure 8 This is a schematic diagram of the hydraulic valve block cleaning production line from one perspective in Example 2;

[0032] Figure 9 for Figure 8 The diagram shows a front view of the cleaning line for the hydraulic valve block.

[0033] Figure 10 for Figure 8 The diagram shows the structure of the composite cleaning unit in the hydraulic valve block cleaning production line.

[0034] Figure 11 for Figure 8 The diagram shows a lifting structure in the cleaning line of the hydraulic valve block.

[0035] Figure 12 for Figure 8 The diagram shows the structure of the fixed fixture in the cleaning line of the hydraulic valve block;

[0036] Figure 13 for Figure 12 Enlarged view of point A in the middle.

[0037] Explanation of reference numerals in the attached figures

[0038] 1: Fixed fixture; 101: Fixed base; 102: Fixed frame; 103: Sliding frame; 1031: Frame body; 1032: Slider; 104: Slide rail; 105: Base plate;

[0039] 2: Lifting mechanism; 3: Conveyor line; 4: Demagnetizing assembly;

[0040] 5: High-pressure flushing unit; 51: Clamping frame;

[0041] 6: Composite cleaning unit; 61: Bracket; 611: Connecting plate; 612: Rotating clamping part; 613: First support roller; 614: Second support roller; 615: Limiting component; 62: Housing; 621: Slag discharge port; 63: Driver; 64: Nozzle; 65: Nozzle; 66: Drain pipe; 67: Ultrasonic component; 68: Vacuum tube; 69: Heating tube; 7: Axial flow fan; 8: Lifting mechanism. Detailed Implementation

[0042] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0044] Example 1:

[0045] Reference Figures 1 to 7 This embodiment proposes a cleaning method for hydraulic valve blocks, which can replace manual cleaning of hydraulic valve blocks to achieve a higher degree of cleanliness. Specifically, the cleaning method for hydraulic valve blocks in this embodiment includes the following steps.

[0046] S1. The hydraulic valve block is placed on the transport line 3 by the fixed fixture 1;

[0047] S2. The fixed fixture 1 with the hydraulic valve block moves along the transport line 3 and passes through the demagnetizing assembly 4 to demagnetize the hydraulic valve block.

[0048] S3. After demagnetization, the fixed fixture 1 with the hydraulic valve block continues to move along the transport line 3 and enters the high-pressure flushing unit 5 to flush the opening of the hydraulic valve block under high pressure.

[0049] S4. After high-pressure rinsing, the fixed fixture 1 with the hydraulic valve block continues to move along the transport line 3 and enters the composite cleaning unit 6. The hydraulic valve block is sprayed and ultrasonically cleaned with cleaning fluid, and then dried at high temperature in the composite cleaning unit 6.

[0050] The hydraulic valve block is supported by a fixed fixture 1 to avoid damage during transportation and ensure accurate cleaning positioning; the demagnetization treatment effectively removes residual magnetism from the valve block and reduces iron filings adsorption, clearing obstacles for subsequent cleaning; high-pressure rinsing specifically removes stubborn impurities inside the openings, and the combined spray and ultrasonic cleaning can fully cover the surface of the valve block, as well as deep holes and cavities, greatly improving the thoroughness of cleaning; high-temperature drying is performed immediately after spray cleaning and ultrasonic cleaning to avoid water residue causing secondary pollution or corrosion; the entire process is automated and requires no manual intervention, which reduces labor intensity and improves cleaning efficiency and cleanliness consistency, effectively ensuring the reliability of subsequent assembly of the hydraulic valve block and operation of the hydraulic system.

[0051] Each step is described in detail below:

[0052] Regarding step S1:

[0053] In this embodiment, refer to Figure 1 and Figure 2The fixed fixture 1 clamps the hydraulic valve block onto the transport line 3. The transport line 3 has a two-layer structure, and lifting mechanisms 2 are symmetrically distributed at both ends of the transport line 3. The lifting mechanisms 2 can transfer the fixed fixture 1 with the hydraulic valve block between the upper and lower layers of the transport line 3. After the operator fixes the hydraulic valve block to the fixed fixture 1, it moves from the lower layer of the transport line 3 to the upper layer of the transport line 3 through a lifting mechanism 2. Thus, the fixed fixture 1 with the hydraulic valve block moves along the upper layer of the transport line 3.

[0054] Regarding step S2:

[0055] In this embodiment, refer to Figure 1 and Figure 2 The fixed fixture 1, equipped with a hydraulic valve block, moves along the upper layer of the conveyor line 3 and passes through the demagnetizing assembly 4 to demagnetize the hydraulic valve block. Because the hydraulic valve block is made of metal, it is easily mechanically magnetized during machining due to high-speed friction and impact between the cutting tool and the valve block. Furthermore, the electromagnets, magnetic fixtures, and high-frequency motors in the machining equipment generate external magnetic fields, further magnetizing the hydraulic valve block and leaving residual magnetism. Therefore, the demagnetizing assembly 4 effectively eliminates the residual magnetism generated during machining, preventing magnetic debris from interfering with subsequent cleaning.

[0056] Regarding step S3:

[0057] In this embodiment, refer to Figure 1 , Figure 2 and Figure 7 After demagnetization, the fixture 1 with the hydraulic valve block continues to move along the transport line 3. The hydraulic valve block leaves the demagnetization assembly 4. The fixture 1 with the hydraulic valve block moves to the high-pressure rinsing unit 5 via the lifting mechanism 8. The lifting mechanism 8 includes an upper moving mechanism and a lower lifting mechanism. When the fixture 1 with the hydraulic valve block moves above the lower lifting mechanism, the lower lifting mechanism rises and lifts the fixture 1 with the hydraulic valve block, separating it from the transport line 3. The upper moving mechanism descends and connects with the fixture 1. The upper moving mechanism moves from the transport line 3 to the inside of the high-pressure rinsing unit 5. The clamping frame 51 of the high-pressure rinsing unit 5 clamps the fixture 1 on both sides and fixes the fixture 1 inside the high-pressure rinsing unit 5.

[0058] The high-pressure flushing unit 5 includes a five-axis CNC system, a high-pressure spray gun, and a nozzle magazine. The high-pressure spray gun is fixed on the spindle of the five-axis CNC system, and the nozzle magazine is also located on the spindle. The spindle of the five-axis CNC system can drive the high-pressure spray gun to flush some of the openings of the hydraulic valve block. The openings of the hydraulic valve block include mounting holes, oil passage holes, and process holes. The openings that are mainly flushed are the oil passage holes and process holes. The mounting holes of the hydraulic valve block are located on one side of the hydraulic valve block and do not need to be flushed. The side of the hydraulic valve block with the mounting holes is located on the bottom surface of the hydraulic valve block and abuts against the fixed fixture 1.

[0059] The nozzle library includes various nozzles for rinsing hydraulic valve blocks (such as straight nozzles with slender rods for deep holes, fan-shaped nozzles for flat surfaces, and conical nozzles for sides). The spindle of the five-axis CNC system rinses the hydraulic valve blocks by switching between different nozzles.

[0060] The high-pressure flushing unit 5 controls the flushing of the hydraulic valve blocks through a FANUC CNC system. Operators can write and call different cleaning path programs for different hydraulic valve blocks.

[0061] After the high-pressure flushing unit 5 flushes the hydraulic valve block, the fixed fixture 1 with the hydraulic valve block moves outward from the high-pressure flushing unit 5 to the lower lifting mechanism via the upper moving mechanism. Then the lower lifting mechanism falls down, and the fixed fixture 1 with the hydraulic valve block falls onto the transport line 3.

[0062] Regarding step S4:

[0063] In this embodiment, refer to Figures 1 to 6 After high-pressure rinsing, the fixed fixture 1 with the hydraulic valve block continues to move along the conveyor line 3, and is then moved to the composite cleaning unit 6 via the lifting mechanism 2. The steps for moving the fixed fixture 1 from the conveyor line 3 to the composite cleaning unit 6 are the same as the steps for moving the fixed fixture 1 from the conveyor line 3 to the high-pressure rinsing unit 5, and will not be repeated here. The composite cleaning unit 6 can perform spray cleaning, ultrasonic cleaning, and high-temperature drying on the hydraulic valve block.

[0064] The composite cleaning unit 6 includes a housing 62, a bracket 61, a driver 63, a nozzle 65, and a spray port 64. The housing 62 is cylindrical in shape, and the inner side of the housing is a regular polygon. It is driven by the driver 63 and connected to the bracket 61. The bracket 61 rotates inside the housing 62. The bracket 61 includes a connecting plate 611 and a circular rotating clamping part 612. The connecting plate 611 extends vertically and is fixedly connected to the output shaft of the driver 63 by welding, screwing, or snap-fitting. The connecting plate 611 also has multiple slots for weight reduction. The rotating clamping part 612 extends in the same direction as the housing 62. The rotating clamping part 612 also has several slots for weight reduction and several reinforcing rods connecting the two sides of the rotating clamping part 612 to enhance its strength. The two ends of the connecting plate 611 are fixedly connected to the side of the rotating clamping part 612 by welding, screwing or snapping. Two sets of rotatable first support rollers 613 are arranged opposite each other on the inner side wall of the housing 62. The bottom of the first support rollers 613 is fixedly connected to the inner side wall of the housing 62 by welding, screwing or snapping. The support surface of the first support rollers 613 abuts against the rotating clamping part 612, and the rotating clamping part 612 can rotate while abutting against the first support rollers 613 to prevent the rotating clamping part 612 from shaking. The inner side of the rotating clamping part 612 is also provided with two sets of rotatable second support rollers 614. The two sets of second support rollers 614 are arranged opposite each other and correspond to the two ends of the fixed fixture 1. Thus, the fixed fixture 1 can move closer to or away from the composite cleaning unit 6 along the two sets of second support rollers 614. Moreover, a limiting member 615 is fixedly provided above each of the two sets of second support rollers 614. The limiting member 615 corresponds to the two ends of the fixed fixture 1. The limiting member 615 has a first plate and a second plate that are perpendicularly connected. The first plate is fixedly connected to the rotating clamping part 612 by welding, screwing or snapping. The second plate is parallel to the fixed fixture 1. When the fixed fixture 1 is located in the composite cleaning unit 6, the fixed fixture 1 is clamped between the second plate and the second support rollers 614, and the two ends of the fixed fixture 1 abut against the two first plates. The nozzles 65 and nozzles 64 are symmetrically distributed about the vertical centerline of the housing 62, and are close to the top of the housing 62. The nozzles 65 and nozzles 64 are arranged in rows, with the number of nozzles 65 and nozzles 64 in each row ranging from 6 to 9. The distance between two adjacent nozzles 65 in each row is ranging from 50 mm to 150 mm, and the distance between two adjacent nozzles 64 in each row is ranging from 50 mm to 150 mm.

[0065] Furthermore, the composite cleaning unit 6 also includes two heating tubes 69. One end of each heating tube 69 is connected to the top of the housing 62. Thus, a fan is installed inside one of the heating tubes 69, which can supply hot air to the housing 62 to heat the interior of the housing 62. The cold air in the housing 62 is blown towards the other heating tube 69. The other ends of the two heating tubes 69 are connected to a heating unit (such as a heating resistor, an infrared heating element, or an electromagnetic coil), which can reheat the cold air. The gas inside the housing 62 circulates with the gas inside the two heating tubes 69, so that the temperature inside the housing 62 and the two heating tubes 69 tends to be the same.

[0066] Specifically, the actuator 63 is a motor that drives the bracket 61 to rotate. The rotation angle of the actuator 63 is the same as that of the bracket. The output shaft of the actuator 63 rotates periodically in both directions, with the forward and reverse angles being the same and both within the range of 180°-360°. This causes the bracket 63 to drive the hydraulic valve block to oscillate back and forth. Thus, when the actuator 63 is not activated, the fixed fixture 1 and the hydraulic valve block are placed horizontally. After the actuator 63 is activated, the fixed fixture 1 and the hydraulic valve block oscillate around the output shaft of the actuator 63, with the oscillation boundary at the nozzle 65 and the spray port 64.

[0067] The spray cleaning steps using the composite cleaning unit 6 include sequential jet spray cleaning and surge spray cleaning.

[0068] Jet spray cleaning involves spraying cleaning fluid from nozzle 65. Since the cross-sectional area of ​​nozzle 65 decreases towards the outlet, and the fluid output remains constant, the cleaning fluid is sprayed out with considerable pressure, effectively impacting the reciprocating hydraulic valve block. The cleaning fluid washes the outer surface of the hydraulic valve block, initially removing a significant amount of impurities. Therefore, during jet spray cleaning, the drain pipe 66 and slag discharge port 621 at the bottom of the tank 62 open simultaneously, preventing the accumulation of cleaning fluid that has washed the hydraulic valve block within the tank 62. After the cleaning fluid has finished washing the hydraulic valve block, the jet spray cleaning stops, and the cleaning fluid in the tank 62 is completely drained. The drain pipe 66 and slag discharge port 621 at the bottom of the tank 62 close simultaneously, leaving no residual cleaning fluid in the tank 62. The jet spray cleaning time for the hydraulic valve block is within the range of 60-90 seconds.

[0069] After the jet spray cleaning step is completed, the drain pipe 66 is closed and there is no residual cleaning fluid in the tank 62. Then the surge spray cleaning begins. Surge spray cleaning involves spraying cleaning fluid from nozzle 64, whose opening is larger than that of nozzle 65. Therefore, the cleaning fluid sprayed from nozzle 64 directly fills the tank 62. As more and more cleaning fluid accumulates in the tank 62, the hydraulic valve block continues to oscillate back and forth. This causes the hydraulic valve block to impact the surface of the cleaning fluid, entering and exiting it, creating a powerful impact. The impact of the hydraulic valve block forms a wave-like surge, which further impacts the exposed hydraulic valve block until the cleaning fluid reaches the height of nozzle 64. At this point, the hydraulic valve block continues to be impacted within the cleaning fluid, completely immersed in it. This ensures thorough cleaning of the hydraulic valve block and its openings. Furthermore, the cyclical oscillation of the hydraulic valve block within the cleaning fluid washes away any adhering impurities. The surge spray cleaning time is between 60 and 90 seconds.

[0070] After the surge spray cleaning time is reached, the surge spray cleaning ends and the ultrasonic cleaning step begins.

[0071] The ultrasonic cleaning steps performed using the composite cleaning unit 6 include:

[0072] The ultrasonic component 67 is activated, and the cleaning fluid inside the chamber 62 is subjected to ultrasonic vibrations. Simultaneously, during the surge-type spray cleaning process, the entire hydraulic valve block is immersed in the cleaning fluid within chamber 62. The hydraulic valve block continues to oscillate, and being immersed in the vibrating cleaning fluid, the entire hydraulic valve block is subjected to ultrasonic vibrations. At the same time, the vacuum pump in the composite cleaning unit 6 is activated, evacuating the chamber 62. As the gas inside chamber 62 is removed, the air pressure inside chamber 62 continuously decreases, and the cavitation threshold of the cleaning fluid gradually decreases. More and more cavitation bubbles are generated within the cleaning fluid. The micro-jet and shock wave intensity generated when these cavitation bubbles burst are significantly more effective at cleaning the hydraulic valve block than ordinary ultrasonic cleaning, greatly enhancing the ability to remove fine dirt from the hydraulic valve block. This continues until the vacuum pump evacuates the chamber 62 to -95 kPa, generating a large number of cavitation bubbles in the cleaning fluid, further cleaning the hydraulic valve block. The ultrasonic cleaning time is within the range of 60-90 seconds.

[0073] The high-temperature drying step performed using the composite cleaning unit 6 includes:

[0074] After the ultrasonic cleaning time is completed, the high-temperature drying step begins. Specifically, the drain pipe 66 of the chamber 62 is opened, and the cleaning fluid inside the chamber 62 is discharged from the drain pipe 66. When the level of the cleaning fluid in the chamber 62 drops to the height of the drain pipe 66, the cleaning fluid can no longer be discharged from the drain pipe 66, and the slag discharge port 621 at the bottom of the chamber 62 is opened. The opening of the slag discharge port 621 is large enough to discharge the remaining cleaning fluid along with the impurities flushed off the hydraulic valve block from the slag discharge port 621. The volume inside the chamber 62 is fixed, and the time required to completely empty the cleaning fluid inside the chamber 62 is fixed. The cleaning fluid inside the chamber 62 can be completely emptied within a preset time. Therefore, after the ultrasonic cleaning is completed, the slag discharge port 621 is opened within the preset time range, and the cleaning fluid can completely flow out from the slag discharge port 621. Subsequently, the slag discharge port 621 is closed. The preset time range is between 30s and 90s. Subsequently, heating element 69 circulates hot air into chamber 62. In other embodiments, chamber 62 can also be directly connected to a heater, allowing hot air to circulate inside chamber 62 as well. Circulating hot air also blows away residual cleaning fluid on the hydraulic valve block. The hot air heats the hydraulic valve block to a preset temperature, which is between 40 and 60 degrees Celsius. Heating element 69 is then turned off. A vacuum environment is then created by evacuating chamber 62. During the evacuation process, the boiling point of the cleaning fluid inside chamber 62 decreases as the pressure inside chamber 62 decreases, until the residual cleaning fluid inside chamber 62 vaporizes. As vacuum tube 68 continuously evacuates chamber 62, the gas inside chamber 62 is extracted by vacuum tube 68 until the residual cleaning fluid on the hydraulic valve block is completely vaporized, thus ending the high-temperature drying step.

[0075] The fixed fixture 1 with hydraulic valve block moves from the composite cleaning unit 6 to the transport line 3. The steps for moving the fixed fixture 1 from the composite cleaning unit 6 to the transport line 3 are the same as the steps for moving the fixed fixture 1 from the high-pressure rinsing unit 5 to the transport line 3, and will not be described again here.

[0076] Regarding step S5:

[0077] In this embodiment, the hydraulic valve block, after being dried at high temperature in the composite cleaning unit 6, continues to move along the transport line 3. It passes by the axial flow fan 7 located at the top of the transport line 3. The axial flow fan 7 blows gas away from the transport line 3 to cool the hydraulic valve block after it has been dried at high temperature. Then, the fixture 1 with the hydraulic valve block moves to the end of the transport line 3. The lifting mechanism 2 at the end of the transport line 3 moves the fixture 1 with the hydraulic valve block from the upper layer of the transport line 3 to the lower layer of the transport line 3. At this time, the hydraulic valve block is separated from the fixture 1 and the hydraulic valve block is transported to the storage space. The fixture 1 moves along the lower layer of the transport line 3 to the beginning of the transport line 3. At this time, a complete cycle of cleaning a hydraulic valve block is completed.

[0078] Example 2:

[0079] Reference Figures 8 to 13 This embodiment proposes a hydraulic valve block cleaning production line for performing the hydraulic valve block cleaning method of Embodiment 1. Embodiments 1 and 2 describe the hydraulic valve block cleaning method of the present invention from two different perspectives: steps and structure, and can be referenced by each other.

[0080] Specifically, the cleaning line for the hydraulic valve block in this embodiment includes a fixed fixture 1, a transport line 3, a demagnetizing assembly 4, a high-pressure rinsing unit 5, and a composite cleaning unit 6.

[0081] In this embodiment, the fixed fixture 1 is used to clamp the hydraulic valve block, thereby driving the hydraulic valve block to move along the conveyor line 3. The conveyor line 3 uses profiles as a frame, and the power rollers are spaced apart along the length of the conveyor line 3 by multiple wear-resistant chrome-plated rods, with the distance between two adjacent power rollers being within the range of 100mm-150mm, to ensure that the bottom of the fixed fixture 1 is always supported by at least 4 power rollers simultaneously, ensuring smooth conveying. The conveyor line 3 is driven by multiple motors, and the two ends of the power rollers are provided with meshing teeth. The drive end of the motor is connected to the chain drive, which drives the power rollers to rotate.

[0082] The demagnetizing component 4 includes a demagnetizer. The magnetic field strength and demagnetizing frequency of the demagnetizer are adjustable, which can effectively eliminate the residual magnetism generated by the hydraulic valve block during machining and prevent magnetic debris from interfering with subsequent cleaning.

[0083] The high-pressure flushing unit 5 is used to perform high-pressure flushing on the openings of the hydraulic valve block. Specifically, the openings of the hydraulic valve block include mounting holes, oil passage holes, and process holes. The flushing of the openings of the hydraulic valve block by the high-pressure flushing unit 5 is the same as that in Example 1, and will not be repeated here.

[0084] The composite cleaning unit 6 is used to perform spray cleaning, ultrasonic cleaning and high-temperature drying on the hydraulic valve block.

[0085] The demagnetizing assembly 4, high-pressure flushing unit 5, and composite cleaning unit 6 are arranged sequentially along transport line 3, working in conjunction with fixed fixture 1 to drive the valve block to move automatically without manual intervention, significantly reducing labor intensity. Demagnetization effectively removes residual magnetism from the valve block and reduces iron filings adsorption; high-pressure flushing specifically removes stubborn impurities from the openings; and the combined spray and ultrasonic cleaning comprehensively covers the valve block surface, deep holes, and cavities. High-temperature drying is performed immediately after spray and ultrasonic cleaning to prevent water residue from causing secondary pollution or corrosion, significantly improving cleaning thoroughness and stability, ensuring the assembly quality of the hydraulic valve block and the reliability of the hydraulic system.

[0086] Furthermore, the high-pressure flushing unit 5 includes a sealed box, a five-axis CNC system, a high-pressure spray gun, and a nozzle magazine. The sealed box of the high-pressure flushing unit 5 forms a closed flushing environment to prevent splashing of cleaning fluid and diffusion of impurities during the flushing process. The five-axis CNC system is installed inside the sealed box, the high-pressure spray gun is fixed on the spindle of the five-axis CNC system, and the nozzle magazine is also assembled on the spindle of the five-axis CNC system. When the hydraulic valve block enters the preset flushing position in the sealed box with the fixed fixture 1, the five-axis CNC system starts and drives the high-pressure spray gun and nozzle magazine to perform multi-dimensional motion adjustment through the spindle. According to the different types and positions of openings on the hydraulic valve block, the high-pressure spray gun can be precisely positioned by the spindle, so that the nozzle on the high-pressure spray gun is aligned with the opening to be flushed. Then the high-pressure spray gun starts to output high-pressure cleaning fluid. Through the flexible drive of the spindle of the five-axis CNC system, a comprehensive and precise flushing operation of various openings on the hydraulic valve block is completed.

[0087] Furthermore, the composite cleaning unit 6 includes a housing 62, a driver 63, a bracket 61, a nozzle 64, a spray nozzle 65, a drain pipe 66, and an ultrasonic component 67.

[0088] The internal structure of the housing 62 is as described in Example 1. Figures 3-6 The diagram shows only a specific installation method. The present invention is not limited to this, and any structure that can drive the fixed fixture 1 to swing is acceptable. The housing 62 forms a closed cleaning space. The driver 63 is fixed to the outside of the housing 62 by welding, screwing, or snap-fitting. The output shaft of the driver 63 passes through the wall of the housing 62 and extends into the inner cavity of the housing 62. The output shaft is sealed and connected to the through hole on the wall of the housing 62.

[0089] The bracket 61 is located inside the housing 62 and is driven by the output shaft of the driver 63, ensuring that the driver 63 can drive the bracket 61 to move stably. The hydraulic valve block to be cleaned is clamped and fixed by the bracket 61 along with the fixing fixture 1. The rest is the same as in embodiment 1, and will not be described again here.

[0090] Spray nozzles 64 and nozzles 65 are installed on opposite sides of the inner wall of the housing 62. The arrangement direction of these two sides is basically consistent with the swing path direction of the bracket 61, so that both spray nozzles 64 and nozzles 65 can spray water towards the area above the bracket 61.

[0091] The side walls and bottom of the housing 62 are equipped with ultrasonic components 67. The ultrasonic components 67 include multiple stainless steel vibrating plates, each of which is equipped with 24 piezoelectric ceramic transducers with a power of 100W, for a total power of 9.6kW and a working frequency of 28KHz. The ultrasonic generator adopts IGBT control mode, and the output power can be continuously adjusted.

[0092] The bottom of the housing 62 is also connected to a drain pipe 66 that can be selectively opened and closed. When the drain pipe 66 is open, it is used to discharge cleaning waste liquid. When the hydraulic valve block enters the housing 62 with the fixed fixture 1, the driver 63 is started. Its output shaft drives the bracket 61 and the fixed fixture 1 to move synchronously, so that the hydraulic valve block rotates around the output shaft of the driver 63 inside the housing 62. The nozzle 64 and the nozzle 65 are started one after another, spraying cleaning liquid onto the hydraulic valve block from two opposite directions. Then the ultrasonic component 67 is started, transmitting high-frequency oscillations to the cleaning liquid through the bottom and side walls of the housing 62, causing the cleaning liquid to generate a large number of cavitation bubbles. The impact force of the bubble bursting removes stubborn impurities from the surface of the hydraulic valve block and the cavity and deep hole. The waste liquid generated during the cleaning process is continuously discharged through the drain pipe 66 at the bottom of the housing 62. After the spray cleaning and ultrasonic cleaning are completed, the subsequent high-temperature drying process can be connected to realize the integrated operation of cleaning and draining.

[0093] Furthermore, the composite cleaning unit 6 also includes a vacuum tube 68 and a heating tube 69. A vacuum tube 68 is installed above the chamber 62 and connected to the inner cavity of the chamber 62. Simultaneously, two heating tubes 69 are assembled above the chamber 62, ensuring that both heating tubes 69 are connected to the inner cavity of the chamber 62. The vacuum tube 68 is connected to a vacuum pump. After the hydraulic valve block enters the chamber 62, during the high-temperature drying step, two heating tubes 69 are used. One of the heating tubes is equipped with a fan that blows hot air from the heating tube into the chamber 62. A heating unit (such as a heating resistor, infrared heating element, or electromagnetic coil) is connected between the two heating tubes 69. The two heating tubes 69 circulate hot air into the chamber 62. The hot air enters the chamber 62 through one heating tube 69, heating the hydraulic valve block, and exhausts cold air from the other heating tube 69. The heating unit can then reheat the cold air, causing the temperature inside the chamber 62 and the two heating tubes 69 to become more uniform. After heating is completed, a vacuum is applied to the inside of the chamber 62 through the vacuum tube 68. During the vacuuming process, the ultrasonic cleaning stage can reduce the cavitation threshold inside the chamber 62, the high-temperature drying stage can reduce the boiling point of the cleaning liquid, and the gas generated inside the chamber 62 during the vacuuming process can be collected and discharged through the vacuum tube 68.

[0094] Furthermore, the fixed fixture 1 includes four fixed seats 101, a fixed frame 102, a sliding frame 103, a slide rail 104, and a base plate 105. Two fixed seats 101 are fixed to two oppositely arranged fixed frames 102 by welding, screwing, or snap-fitting, respectively. The other two fixed seats 101 are fixed to the sliding frame 103 by welding, screwing, or snap-fitting, respectively. After assembly, the four fixed seats 101 are distributed at the four corners of the rectangle. The sliding frame 103 is mounted above the slide rail 104. A through hole is opened in the middle of the base plate 105. Two slide rails 104 are fixed to both sides of the through hole in the base plate 105 by welding, screwing, or snap-fitting, respectively. The bottom surface of the hydraulic valve block can be exposed through this through hole.

[0095] The sliding frame 103 consists of a frame 1031 and two 1032s. The cross-sections of the slide rails 104 and 1032 are both inverted T-shaped structures. The 1032 is embedded in the slide rail 104. The frame 1031 and 1032 are connected by bolts. This connection structure allows the 1032 to switch between a fixed state and a sliding state.

[0096] When 1032 is in the sliding state, the bolt remains loose. At this time, the frame 1031 and 1032 form an anti-detachment connection through the bolt. With the help of the sliding cooperation between the sliding frame 103 and the slide rail 104, the position of the sliding frame 103 can be adjusted so that the four fixed seats 101 are precisely aligned with the four corners of the hydraulic valve block.

[0097] When 1032 is in a fixed state, the bolts are tightened to the tightened state. The frame 1031 and 1032 clamp and fix the slide rail 104 with bolts, so that the sliding frame 103 and the slide rail 104 form a fixed connection. At this time, the four fixed seats 101 are simultaneously clamped at the four corners of the top surface of the hydraulic valve block, realizing the positioning and fixing of the hydraulic valve block.

[0098] The fixed base 101 includes a base, clamping bolts and clamping rods. The base is fixed to the fixed frame 102 or the sliding frame 103 by welding, screwing or snapping, etc., and the clamping rods are threaded to the base by the clamping bolts.

[0099] When the sliding frame 103 is in the sliding state, the clamping bolt and the clamping rod are in a loose state;

[0100] When the sliding frame 103 is in the fixed state, the clamping bolt and the clamping rod are tightened, and the clamping rod abuts against the top of the hydraulic valve block.

[0101] Furthermore, the lifting mechanism 2 includes a drive motor, a lead screw, and a lifting frame with a threaded hole; the drive motor is connected to the lead screw, the lead screw extends vertically, the lifting frame extends horizontally, and the threaded hole at the end of the lifting frame is threadedly connected to the lead screw. The drive motor drives the lead screw to rotate, thereby causing the lifting frame to move vertically.

[0102] The lifting mechanism 8 includes an upper moving mechanism and a lower lifting mechanism. The upper moving mechanism includes two first hydraulic cylinders, four plug-in rods, four second hydraulic cylinders, and a mounting frame. The two hydraulic cylinders are fixed to both sides of the mounting frame by welding, screwing, or snapping. The mounting frame is fixed above the transport line 3 by welding, screwing, or snapping. The plug-in rods are fixed below the mounting frame by welding, screwing, or snapping. The two ends of the second hydraulic cylinders are fixed to the mounting frame and the plug-in rods by welding, screwing, or snapping. The base plate 105 has through holes corresponding to the four plug-in rods.

[0103] The lower lifting mechanism includes multiple third hydraulic cylinders, a connecting frame, a lifting frame, and multiple first sliding rollers. The connecting frame is fixed to the lower part of the upper transport line 3 by welding, screwing, or snapping. The two ends of the third hydraulic cylinders are fixed to the connecting frame and the lifting frame by welding, screwing, or snapping, respectively. The multiple first sliding rollers are rotatably connected to both sides of the lifting frame.

[0104] The lifting frame is driven upward by the third hydraulic cylinder, causing the first sliding roller to protrude from the upper transport line 3, thereby lifting the fixed fixture 1 with hydraulic valve block. The first sliding roller corresponds to the two ends of the fixed fixture 1. The plug rod is driven downward by the second hydraulic cylinder to insert into the through hole of the base plate 105. The upper moving mechanism is connected to the fixed fixture 1 with hydraulic valve block. The fixed fixture 1 is driven by the first hydraulic cylinder to move along the multiple first sliding rollers towards the composite cleaning unit 6 or the high-pressure cleaning unit.

[0105] Among them, multiple first sliding rollers are rotatably provided with multiple second sliding rollers in the extension direction of the composite cleaning unit 6. The multiple second sliding rollers correspond to the two ends of the fixed fixture 1 and can rotatably support the fixed fixture 1 to move to the composite cleaning unit 6 or the high-pressure cleaning unit.

[0106] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0107] 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0108] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0109] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for cleaning a hydraulic valve block, characterized in that: Includes the following steps: S1. The hydraulic valve block is placed on the transport line (3) by a fixed fixture (1); S2. The fixed fixture (1) with hydraulic valve block moves along the transport line (3) and passes through the demagnetizing assembly (4) to demagnetize the hydraulic valve block; S3. After demagnetization, the fixed fixture (1) with the hydraulic valve block continues to move along the transport line (3) and enters the high-pressure flushing unit (5) to flush the opening of the hydraulic valve block under high pressure. S4. After high-pressure rinsing, the fixed fixture (1) with hydraulic valve block continues to move along the transport line (3) and enters the composite cleaning unit (6). The hydraulic valve block is sprayed and ultrasonically cleaned with cleaning fluid, and then dried at high temperature in the composite cleaning unit (6).

2. The cleaning method for the hydraulic valve block as described in claim 1, characterized in that: Step S4 includes a spray cleaning step, an ultrasonic cleaning step, and a high-temperature drying step. The ultrasonic cleaning steps include: forming a vacuum environment in the composite cleaning unit (6), starting ultrasonic vibration cleaning fluid to generate cavitation bubbles in the cleaning fluid, and cleaning the hydraulic valve block with cleaning fluid containing cavitation bubbles. The high-temperature drying step includes: draining the cleaning liquid in the composite cleaning unit (6), passing hot air into the composite cleaning unit (6) to heat the hydraulic valve block to a preset temperature, and then drawing a vacuum in the composite cleaning unit (6) to form a vacuum environment. During the vacuuming process, the internal air pressure of the composite cleaning unit (6) decreases, and at the same time, the boiling point of the cleaning liquid remaining on the hydraulic valve block decreases, causing the cleaning liquid on the hydraulic valve block to boil, vaporize, and be extracted.

3. The cleaning method for the hydraulic valve block as described in claim 2, characterized in that: Step S3 also includes: The high-pressure flushing unit (5) is equipped with a clamping frame (51), which clamps the fixed fixture (1) and flushes the opening of the hydraulic valve block. Step S4 also includes: The composite cleaning unit (6) is equipped with a bracket (61) to hold the fixed fixture (1). In the spray cleaning step and the ultrasonic cleaning step, the bracket (61) can drive the fixed fixture (1) to swing circumferentially.

4. The cleaning method for the hydraulic valve block as described in claim 3, characterized in that: In step S4: The spray cleaning process includes sequential jet spray cleaning and surge spray cleaning. Jet spray cleaning involves the nozzles within the composite cleaning unit (6) spraying cleaning fluid onto the hydraulic valve block; The surge spray cleaning involves spraying cleaning fluid from the nozzles inside the composite cleaning unit (6). As the bracket (61) drives the fixed fixture (1) to swing circumferentially, the hydraulic valve block impacts the cleaning fluid accumulated inside the composite cleaning unit (6), thereby flushing the hydraulic valve block.

5. The cleaning method for the hydraulic valve block as described in claim 1, characterized in that: It also includes step S5: The fixed fixture (1) with the hydraulic valve block continues to move along the transport line (3) and passes through the axial flow fan (7), which cools the hydraulic valve block after it has been dried at high temperature.

6. A cleaning production line for hydraulic valve blocks, characterized in that: For performing the cleaning method of the hydraulic valve block as described in any one of claims 1-5, the cleaning production line includes a fixed fixture (1), a transport line (3), a demagnetizing assembly (4), a high-pressure flushing unit (5), and a composite cleaning unit (6), wherein the demagnetizing assembly (4), the high-pressure flushing unit (5), and the composite cleaning unit (6) are arranged sequentially along the transport line (3); The fixed fixture (1) is used to clamp the hydraulic valve block and drive the hydraulic valve block to move along the transport line (3); The demagnetizing assembly (4) is used to demagnetize the hydraulic valve block; The high-pressure flushing unit (5) is used to flush the openings of the hydraulic valve block under high pressure; The composite cleaning unit (6) is used to perform spray cleaning, ultrasonic cleaning and high-temperature drying on hydraulic valve blocks.

7. The hydraulic valve block cleaning production line as described in claim 6, characterized in that: The high-pressure flushing unit (5) includes a sealed box, a five-axis CNC system, a high-pressure spray gun, and a nozzle magazine; The five-axis CNC system is located inside a sealed box. The high-pressure spray gun is fixed on the spindle of the five-axis CNC system, and the nozzle magazine is set on the spindle of the five-axis CNC system. The high-pressure spray gun is driven by the spindle of the five-axis CNC system, which is suitable for flushing the openings on the hydraulic valve block.

8. The hydraulic valve block cleaning production line as described in claim 6, characterized in that: The composite cleaning unit (6) includes a bracket (61), a housing (62), a driver (63), a nozzle (64), a spray nozzle (65), a drain pipe (66), and an ultrasonic component (67). The driver (63) is fixed to one end of the housing (62), and the output shaft of the driver (63) extends into the housing (62). The driver (63) is connected to the bracket (61) for driving. The bracket (61) clamps and fixes the fixture (1). The nozzle (64) and the nozzle (65) are set on opposite sides of the inner wall of the housing (62). The ultrasonic component (67) is installed on the bottom and side wall of the housing (62). The drain pipe (66) is connected to the bottom of the housing (62).

9. The cleaning production line for hydraulic valve blocks as described in claim 7, characterized in that: The composite cleaning unit (6) also includes a vacuum tube (68) and a heating tube (69). The vacuum tube (68) is located above and connected to the housing (62), and the two heating tubes (69) are located above and connected to the housing (62). The two heating tubes (69) are connected to the housing (62) to heat the hydraulic valve block. During the vacuuming process of the housing (62) through the vacuum tube (68), the cavitation threshold inside the housing (62) can be reduced during ultrasonic cleaning, and the boiling point of the cleaning fluid can be reduced. The gas inside the housing (62) can be collected through the vacuum tube (68).

10. The cleaning production line for hydraulic valve blocks as described in claim 6, characterized in that: The fixed fixture (1) includes four fixed seats (101), a fixed frame (102), a sliding frame (103), a slide rail (104), and a base plate (105); Two of the fixed seats (101) are fixed on two opposite fixed frames (102), and the other two fixed seats (101) are fixed on the sliding frame (103). The four fixed seats (101) are distributed at the four corners of the rectangle. The sliding frame (103) is connected above the slide rail (104). A through hole is opened in the middle of the base plate (105). Two slide rails (104) are fixed to both sides of the through hole of the base plate (105) to expose the bottom surface of the hydraulic valve block. The sliding frame (103) includes a frame (1031) and two sliders (1032). The cross-sections of the slide rail (104) and the sliders (1032) are both inverted T-shaped. The sliders (1032) are embedded in the slide rail (104). The frame (1031) and the sliders (1032) are connected by bolt threads to facilitate the switching of the sliders (1032) between a fixed state and a sliding state. When the slider (1032) is in the sliding state, the bolt is in the loose state. The frame (1031) and the slider (1032) are connected by bolts to prevent detachment. The sliding frame (103) is connected to the slide rail (104) to facilitate the four fixed seats (101) to be located at the four corners of the hydraulic valve block. When the slider (1032) is in a fixed state, the bolts are tightened. The frame (1031) and the slider (1032) clamp the slide rail (104) with bolts. The sliding frame (103) is fixedly connected to the slide rail (104) to accommodate the four fixed seats (101) clamping the four corners of the top surface of the hydraulic valve block.

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