Low-pressure cleaning machine

Abstract

The low-pressure cleaning machine comprises a machine shell, and a cleaning tank, a vacuum pump, a temperature control assembly and a controller are arranged in the machine shell; the cleaning tank is provided with a water inlet, an extraction opening and a drainage opening, the water inlet is connected with an external water source through a pipeline, the extraction opening is connected with a vacuum pump through a pipeline, and the drainage opening is communicated with the outside through a pipeline; the temperature control assembly is arranged at the bottom of the cleaning tank, the controller is respectively coupled with the vacuum pump and the temperature control assembly, the controller controls the temperature of the cleaning liquid to be raised to a preset temperature through the temperature control assembly, and when the temperature control assembly detects that the temperature of the cleaning liquid is raised to the preset temperature, the controller controls the temperature control assembly to stop heating. After a cleaning object is placed in the cleaning tank and the sealing cover covers the cleaning tank, the controller controls the vacuum pump to produce a corresponding low-pressure environment according to the temperature detected by the temperature control assembly, so that the cleaning liquid is kept in a boiling state. It can be guaranteed that the heat-labile material cannot deform due to the influence of high temperature.

Description

Technical Field

[0001] This invention relates to medical cleaning devices, and more specifically, to a low-pressure cleaning machine. Background Technology

[0002] Currently, most medical devices are cleaned and disinfected manually. This is because there are many medical devices, and they are used frequently every day. In particular, various optical instruments in ophthalmology need to be kept clean. Therefore, manual cleaning consumes a lot of time, and there are bound to be cases where the instruments are not cleaned properly. As a result, the cleaning efficiency is very low.

[0003] Although there are some devices on the market that can clean and disinfect medical devices, these devices cannot select the appropriate cleaning method for each device. This can lead to incomplete cleaning of some devices or damage to others due to the cleaning process. These issues arise because the cleaning device cannot control the cleaning mode.

[0004] Therefore, how to control the cleaning mode of the cleaning machine is the technical problem that this application aims to solve. Summary of the Invention

[0005] To address the shortcomings of existing technologies, a low-pressure cleaning machine is provided, which adjusts the vacuum level of the cleaning tank according to temperature changes, thereby allowing the cleaning fluid to continuously boil and clean the equipment.

[0006] To achieve the above objectives, the following technical solution is provided:

[0007] A low-pressure cleaning machine includes a housing, within which a cleaning tank, a vacuum pump, a temperature control component, and a controller are disposed.

[0008] The cleaning tank has its opening facing upwards and is connected to the outside. The cleaning tank is used to hold cleaning liquid and cleaning materials. The cleaning tank has a water inlet, an air extraction port and a drain outlet. The water inlet is connected to an external water source through a pipe, the air extraction port is connected to a vacuum pump through a pipe, and the drain outlet is connected to the outside through a pipe.

[0009] The temperature control component is located at the bottom of the cleaning tank and is used to heat the cleaning solution and monitor its temperature.

[0010] The cleaning tank is equipped with a cover for sealing the cleaning tank.

[0011] The controller is coupled to the vacuum pump and the temperature control component. The controller controls the cleaning fluid to rise to the preset temperature through the temperature control component. When the temperature control component detects that the cleaning fluid has risen to the preset temperature, the controller controls the temperature control component to stop heating. When the cleaning material is placed in the cleaning tank and the lid is closed, the controller controls the vacuum pump to create a corresponding low-pressure environment according to the temperature detected by the temperature control component, thereby keeping the cleaning fluid in a boiling state.

[0012] In summary, the above technical solution has the following beneficial effects: Medical devices are made of different materials, and different materials have different heat resistance. For example, ordinary plastics will melt under continuous high temperatures, while some metal materials can withstand high temperatures. When cleaning medical devices, doctors can control the temperature of the cleaning solution to a suitable temperature for the device according to its characteristics. Then, the medical device is placed in the cleaning tank and the lid is closed. The cleaning solution is generally water. Water will not boil below 100 degrees Celsius. The controller controls the pressure in the cleaning tank to decrease to the corresponding low-pressure environment according to the preset low-pressure and boiling temperature relationship. The temperature control component detects the temperature of the cleaning solution in real time and adjusts the low-pressure environment in the cleaning tank in real time according to the temperature of the cleaning solution, thereby ensuring that the cleaning solution continues to boil. Because constant temperature and pressure cleaning machines require continuous heating of the cleaning fluid, the temperature of the heating element itself is usually higher than the temperature of the cleaning fluid during the heating process. Therefore, medical equipment is easily damaged by the heat when the heating element is working. However, in this application, because the cleaning fluid is not continuously heated, the temperature of the cleaning fluid will gradually decrease, which can ensure that heat-sensitive materials will not be deformed due to high temperature. In addition, the controller can control the pressure according to the temperature to keep the cleaning fluid boiling continuously. This cleaning mode makes the cleaning of low-pressure cleaning machines safer and the cleaning effect is also very good. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the casing of a low-pressure cleaning machine;

[0014] Figure 2 This is a schematic diagram of the cleaning tank of a low-pressure cleaning machine;

[0015] Figure 3 A schematic diagram of a vacuum pump for a low-pressure cleaner;

[0016] Figure 4 This is a schematic diagram of the instrument frame of a low-pressure cleaning machine;

[0017] Figure 5 This is a schematic diagram of a controller module for a low-pressure washer;

[0018] Figure 6 This is a schematic diagram of a radiator for a low-pressure cleaning machine.

[0019] Figure 7This is a schematic diagram of a telescopic retainer for a low-pressure washer;

[0020] Figure 8 This is a schematic diagram of the cover of a low-pressure washer;

[0021] Figure 9 A schematic diagram of the movable and fixed blocks of a low-pressure cleaning machine;

[0022] Figure 10 This is a schematic diagram of a fixed basket for a low-pressure cleaning machine.

[0023] Reference numerals: 10. Housing; 11. Control panel; 12. Printer; 13. Fixing block; 14. Limiting block; 15. Oblong hole; 16. Rotating shaft; 20. Cleaning tank; 21. Water inlet; 22. Air extraction port; 23. Drain port; 24. Enzyme solution port; 25. Instrument frame; 26. Water inlet valve; 27. Drain valve; 30. Vacuum pump; 40. Temperature control component; 41. Heating wire; 42. Temperature sensor; 50. Controller; 60. Cover; 61. Movable block; 62. Through hole; 70. Enzyme box; 71. Enzyme solution pump; 80. Gas-water separator; 90. Radiator; 91. Copper pipe; 911. Main inlet pipe; 912. Branch pipe; 913. Main outlet pipe; 92. Heat sink; 93. Fan; 100. Telescopic retainer; 101. Telescopic rod; 102. Telescopic cylinder; 110. Sealing ring; 120. Fixed basket; 121. Upper ring; 122. Lower ring; 123. Railing; 124. Bottom mesh; 125. Clip; 126. Pin. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0025] like Figures 1-3As shown, a low-pressure washer includes a housing 10, within which a cleaning tank 20, a vacuum pump 30, a temperature control component 40, and a controller 50 are disposed. The cleaning tank 20 has its opening facing upwards and is connected to the outside. The cleaning tank 20 is used to hold cleaning fluid and cleaning materials. The cleaning tank 20 has a water inlet 21, an air extraction port 22, and a drain outlet 23. The water inlet 21 is connected to an external water source via a pipe, the air extraction port 22 is connected to the vacuum pump 30 via a pipe, and the drain outlet 23 is connected to the outside via a pipe. The temperature control component 40 is located at the bottom of the cleaning tank 20 and is used to heat the cleaning fluid and monitor the cleaning process. The temperature of the liquid; the cleaning tank 20 is provided with a cover 60 for sealing the cleaning tank 20; the controller 50 is coupled to the vacuum pump 30 and the temperature control component 40 respectively. The controller 50 controls the cleaning liquid to rise to the preset temperature through the temperature control component 40. When the temperature control component 40 detects that the cleaning liquid has risen to the preset temperature, the controller 50 controls the temperature control component 40 to stop heating. When the cleaning material is put into the cleaning tank 20 and the cover 60 is closed, the controller 50 controls the vacuum pump 30 to create a corresponding low-pressure environment according to the temperature detected by the temperature control component 40, thereby keeping the cleaning liquid in a boiling state. Medical devices are made of various materials, each with different heat resistance. For example, ordinary plastics will melt under continuous high temperatures, while some metals can withstand high temperatures. When cleaning medical devices, doctors can control the temperature of the cleaning solution to a suitable temperature for the device based on its characteristics. Then, the medical device is placed in the cleaning tank 20 and the cap 60 is closed. The cleaning solution is generally water. Water will not boil below 100 degrees Celsius. Therefore, the controller 50 controls the pressure in the cleaning tank 20 to decrease to the corresponding low-pressure environment based on the preset low-pressure and boiling temperature relationship. The temperature control component 40 monitors the temperature of the cleaning solution in real time and adjusts the low-pressure environment in the cleaning tank 20 accordingly to ensure that the cleaning solution continues to boil. Because constant temperature and pressure cleaning machines require continuous heating of the cleaning fluid, the temperature of the heating element itself is usually higher than the temperature of the cleaning fluid during the heating process. Therefore, medical equipment is easily damaged by the heat when the heating element is working. However, in this application, because the cleaning fluid is not continuously heated, the temperature of the cleaning fluid will gradually decrease, which can ensure that heat-sensitive materials will not be deformed due to high temperature. In addition, the controller 50 can control the pressure according to the temperature to keep the cleaning fluid boiling continuously. This cleaning mode makes the cleaning of low-pressure cleaning machines safer and the cleaning effect is also very good.

[0026] Table 1. Relationship between boiling point of water and vacuum degree

[0027]

[0028]

[0029] The controller 50 controls the vacuum level in the cleaning tank 20 according to the data in Table 1, thereby keeping the cleaning liquid in the cleaning tank 20 continuously boiling. The cleaning liquid is generally water. Accordingly, in order to detect the vacuum level in the cleaning tank 20, a vacuum gauge coupled to the controller 50 needs to be installed in the cleaning tank 20. The vacuum gauge is used to detect the vacuum level in the cleaning tank 20 and provide real-time feedback to the controller 50.

[0030] like Figure 4 As shown, the cleaning tank 20 also has an enzyme solution outlet 24, which is connected to the enzyme box 70 via a pipe. An enzyme solution pump 71 is installed inside the pipe of the enzyme solution outlet 24. The controller 50 is coupled to the enzyme solution pump 71 and is used to control the entry of the enzyme solution in the enzyme box 70 into the cleaning tank 20 via the enzyme solution pump 71. The enzyme box 70 includes a general-purpose enzyme and an alkaline enzyme. There are two corresponding enzyme solution outlets 24 and enzyme solution pumps 71. The enzyme solution pump 71 is a peristaltic pump, which can quantitatively control the amount of enzyme solution squeezed out each time.

[0031] Vacuum pump 30 is a water ring vacuum pump. A vapor-water separator 80 and a radiator 90 are installed inside the casing 10. The water ring vacuum pump 30 includes an intake port, an outlet port, and a water inlet. The intake port is connected to the extraction port 22, the outlet port is connected to the inlet of the vapor-water separator 80, the outlet of the vapor-water separator 80 is connected to the inlet of the radiator 90, and the outlet of the radiator 90 is connected to the water inlet. The water ring vacuum pump 30 draws gas from the cleaning tank 20 into the vapor-water separator 80. The vapor-water separator 80 separates the moisture from the extracted gas. The separated water then enters the radiator 90 for cooling before finally returning to the water ring vacuum pump 30. The working fluid in the water ring vacuum pump 30 decreases during extraction, so it needs to be replenished promptly. Furthermore, the working fluid gradually heats up during extraction, requiring cooling in the radiator 90 before circulating back into the water ring vacuum pump 30. A solenoid valve coupled to the controller 50 is installed between the outlet and the water inlet of the radiator 90. When the working fluid in the water ring vacuum pump 30 is insufficient, the controller 50 can open the solenoid valve to replenish the working fluid.

[0032] like Figure 5 As shown, the radiator 90 includes copper pipes 91, heat sinks 92, and a fan 93. The heat sinks 92 are arranged at equal intervals on one side of the fan 93. The fan 93 drives air through the gaps between the heat sinks 92. The heat sinks 92 have several fixing holes for the copper pipes 91 to pass through. The copper pipes 91 are arranged back and forth within the fixing holes of the heat sinks 92. The outlet of the air-water separator 80 is connected to the inlet of the copper pipes 91, and the outlet of the copper pipes 91 is connected to the water inlet. The fan 93 can control the airflow to be directed towards the copper pipes 91, or it can control the airflow to be directed outwards from one side of the copper pipes 91. The heat sinks 92 can both fix the copper pipes 91 and assist the copper pipes 91 in dissipating heat, increasing the heat dissipation area.

[0033] like Figure 5 As shown, the copper pipe 91 includes a main inlet pipe 911, several branch pipes 912, and a main outlet pipe 913. The number of rows of fixing holes on the heat sink 92 is the same as the number of branch pipes 912. A branch pipe 912 is arranged to shuttle back and forth along a row of fixing holes. The inlet of each branch pipe 912 is connected to the main inlet pipe 911, and the outlet of each branch pipe 912 is connected to the main outlet pipe 913. The diameter of each branch pipe 912 is smaller than the diameter of the main inlet pipe 911 and the main outlet pipe 913. Diverting the liquid in the main inlet pipe 911 into the smaller diameter branch pipes 912 can increase the heat dissipation area and improve the heat dissipation efficiency. The fixing holes in each row can be staggered to avoid the branch pipes 912 blocking each other. Preferably, there are three branch pipes 912.

[0034] The temperature control component 40 includes a heating wire 41 and a temperature sensor 42, both coupled to the controller 50. The heating wire 41 is located at the bottom of the cleaning tank 20. An instrument frame 25 is located inside the cleaning tank 20, positioned above the heating wire 41. The temperature sensor 42 is located on the bottom surface of the instrument frame 25. The instrument frame 25 holds the items to be cleaned, thus preventing direct contact between the items and the temperature control component 40. Because the heating wire 41's own temperature is higher than the temperature to be heated when heating the cleaning solution, the instrument frame 25 is provided to prevent the items from being burned by the heating wire 41. The temperature detected by the temperature sensor 42, located on the bottom surface of the instrument frame 25, is closer to the actual contact temperature of the items. The water inlet 21, the air extraction port 22, and the enzyme solution outlet 24 are all located above the upper edge of the instrument frame 25, while the drain outlet 23 is located at the bottom of the cleaning tank 20.

[0035] like Figure 6 As shown, an inlet valve 26 is installed in the pipe of inlet 21, and a drain valve 27 is installed in the pipe of outlet 23. Controller 50 is coupled to inlet valve 26 and drain valve 27 respectively, and is used to control the inflow and outflow of cleaning fluid. Control panel 11 and printer 12 are installed on housing 10. Control panel 11 is coupled to controller 50 for operating controller 50, and printer 12 is coupled to controller 50 for printing. The inflow and outflow of cleaning fluid are determined by the opening time of inlet valve 26 and drain valve 27. The opening time of each valve and the heating temperature of heating wire 41 can be controlled through control panel 11, and printer 12 can print relevant cleaning data.

[0036] like Figure 7 and Figure 8As shown, one side of the cover 60 is rotatably connected to the housing 10. The cover 60 is used to close or open the cleaning tank 20. A telescopic retainer 100 is provided inside the housing 10. The telescopic retainer 100 includes a telescopic rod 101 and a telescopic cylinder 102. The telescopic rod 101 and the telescopic cylinder 102 are slidably connected. The bottom of the telescopic cylinder 102 is rotatably connected to the housing 10. The rotation direction of the telescopic cylinder 102 is the same as the rotation direction of the cover 60. The telescopic rod 101 is rotatably connected to the side of the cover 60 facing the cleaning tank 20. When the cover 60 is open, the telescopic retainer 100 is used to hold the cover 60 in place so that the cover 60 remains open. The front side of the cover 60 is rotatably connected to the housing 10, which can be done by hinges or a pin. The area of ​​the cover 60 is larger than the opening of the cleaning tank 20, so that the right side of the cover 60 extends beyond the cleaning tank 20. The telescopic retainer 100 is located on the side of the cleaning tank 20. The telescopic rod 101 is rotatably connected to the part of the cover 60 that extends beyond the cleaning tank 20. Rotating the cover 60 upwards opens the cleaning tank 20, and rotating the cover 60 downwards to a horizontal position covers the cleaning tank 20. When the cover 60 is opened from the closed state, the connection between the cover 60 and the telescopic rod 101 will rotate, and the telescopic rod 101 will be extended out of the telescopic cylinder 102. The telescopic cylinder 102 will also rotate, thus cooperating with the cover 60 to open. The cover 60 can rotate up to 90 degrees. When the cover 60 is opened to 90 degrees, the telescopic cylinder 102 and the telescopic rod 101 can rest against the cover 60 to keep the cover 60 in the open state.

[0037] like Figure 9 As shown, a movable block 61 is provided on the front side of the cover 60, and the movable block 61 has a through hole 62; a fixed block 13 is provided on the housing 10, and limit blocks 14 extend upward from both ends of the fixed block 13. The movable block 61 is located between the two limit blocks 14. The two limit blocks 14 have oblong holes 15 along the extension direction of the through hole 62. A rotating shaft 16 passes between the through hole 62 and the oblong hole 15, so that the movable block 61 can rotate relative to the fixed block 13. The length direction of the oblong hole 15 is the extension direction of the limit block 14, so that the movable block 61 and the rotating shaft 16 can move up and down relative to the fixed block 13; a seal is provided on the opening of the cleaning tank 20. The sealing ring 110 is made of elastic materials such as rubber and silicone. When the cover 60 covers the cleaning tank 20 and the vacuum pump 30 performs vacuuming, the cover 60 will tightly suck the cleaning tank 20. The sealing ring 110 can prevent the cleaning tank 20 from leaking air. Because the sealing ring 110 is elastic, the cover 60 will be lowered by a certain distance when vacuuming. The cover 60 is rotatably connected to the housing 10 through the movable block 61 and the fixed block 13. Because the fixed block 13 has an oblong hole 15 and the telescopic retainer 100 can extend and retract, the cover 60 can be lowered by a certain distance when vacuuming, thereby ensuring that the cleaning tank 20 does not leak air.

[0038] like Figure 10 As shown, it also includes a fixed basket 120, which includes an upper ring 121 and a lower ring 122. The upper ring 121 and the lower ring 122 are connected by several railings 123. A bottom net 124 is provided inside the lower ring 122. A retaining sleeve 125 is provided on the outside of the upper ring 121, and a pin 126 is provided on the outside of the lower ring 122. Multiple fixed baskets 120 can be connected in series by retaining sleeves 125 and pins 126 to form a fixed cavity for placing cleaning items. The fixed basket 120 is used to separate the cleaning items in the cleaning tank 20 for cleaning. The cleaning machine of this application is mainly used for cleaning various optical instruments in ophthalmic instruments. If the glass material on the optical instruments is scratched, it will easily cause scratches and affect its use. In order to avoid the optical instruments being scratched in the boiling cleaning solution, a series of detachable fixed baskets 120 are designed. The fixed baskets 120 are used to enclose each optical instrument in a small fixed cavity, thereby preventing the optical instruments from being overturned when the cleaning solution boils.

[0039] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A low pressure cleaning machine characterized in that, It includes a housing (10), and the housing (10) is provided with a cleaning tank (20), a vacuum pump (30), a temperature control component (40) and a controller (50); The opening of the cleaning tank (20) faces upward and is connected to the outside. The cleaning tank (20) is used to hold cleaning liquid and cleaning materials. The cleaning tank (20) is provided with a water inlet (21), an air extraction port (22) and a drain outlet (23). The water inlet (21) is connected to an external water source through a pipe. The air extraction port (22) is connected to a vacuum pump (30) through a pipe. The drain outlet (23) is connected to the outside through a pipe. The temperature control component (40) is located at the bottom of the cleaning tank (20) and is used to heat the cleaning fluid and monitor the temperature of the cleaning fluid. The cleaning tank (20) is provided with a cover (60) for sealing the cleaning tank (20); The controller (50) is coupled to the vacuum pump (30) and the temperature control component (40) respectively. The controller (50) controls the cleaning liquid to rise to a preset temperature through the temperature control component (40). When the temperature control component (40) detects that the cleaning liquid has risen to the preset temperature, the controller (50) controls the temperature control component (40) to stop heating. When the cleaning material is placed in the cleaning tank (20) and the cover (60) is closed, the controller (50) controls the vacuum pump (30) to create a corresponding low-pressure environment according to the temperature detected by the temperature control component (40), thereby keeping the cleaning liquid in a boiling state.

2. The low pressure cleaning machine of claim 1, wherein, The cleaning tank (20) is also provided with an enzyme liquid port (24), which is connected to the enzyme box (70) through a pipe. An enzyme liquid pump (71) is installed in the pipe of the enzyme liquid port (24). The controller (50) is coupled to the enzyme liquid pump (71) and is used to control the enzyme liquid in the enzyme box (70) to enter the cleaning tank (20) through the enzyme liquid pump (71).

3. The low pressure cleaning machine of claim 1, wherein, The vacuum pump (30) is a water ring vacuum pump (30). A steam-water separator (80) and a radiator (90) are provided inside the housing (10). The water ring vacuum pump (30) includes an air intake port, an air outlet port and a water inlet port. The air intake port and the air extraction port (22) are connected. The air outlet port and the inlet of the steam-water separator (80) are connected. The outlet of the steam-water separator (80) and the inlet of the radiator (90) are connected. The outlet of the radiator (90) and the water inlet port are connected.

4. The low pressure cleaning machine of claim 3, wherein, The radiator (90) includes copper pipes (91), heat sinks (92), and a fan (93). The heat sinks (92) are arranged at equal intervals on one side of the fan (93). The fan (93) is used to drive air through the gaps between the heat sinks (92). The heat sinks (92) have several fixing holes for the copper pipes (91) to pass through. The copper pipes (91) are arranged back and forth in the fixing holes of the heat sinks (92). The outlet of the steam-water separator (80) is connected to the inlet of the copper pipes (91), and the outlet of the copper pipes (91) is connected to the water inlet.

5. The low pressure cleaning machine of claim 4, wherein, The copper pipe (91) includes a main inlet pipe (911), several branch pipes (912) and a main outlet pipe (913). The number of fixed holes in the heat sink (92) is the same as the number of branch pipes (912). One branch pipe (912) is arranged to shuttle back and forth along a row of fixed holes. The inlet of each branch pipe (912) is connected to the main inlet pipe (911), and the outlet of each branch pipe (912) is connected to the main outlet pipe (913). The diameter of each branch pipe (912) is smaller than the diameter of the main inlet pipe (911) and the main outlet pipe (913).

6. The low pressure cleaning machine of claim 1, wherein, The temperature control component (40) includes a heating wire (41) and a temperature sensor (42) respectively coupled to the controller (50). The heating wire (41) is disposed at the bottom of the cleaning tank (20). An instrument frame (25) is disposed inside the cleaning tank (20). The instrument frame (25) is disposed above the heating wire (41). The temperature sensor (42) is disposed on the bottom surface of the instrument frame (25). The instrument frame (25) is used to hold the cleaning items, thereby preventing the cleaning items from directly contacting the temperature control component (40).

7. The low pressure cleaning machine of claim 6, wherein, The inlet (21) is equipped with an inlet valve (26) and the outlet (23) is equipped with a drain valve (27). The controller (50) is coupled to the inlet valve (26) and the drain valve (27) respectively, and is used to control the inflow and outflow of the cleaning liquid. The housing (10) is provided with a control panel (11) and a printer (12). The control panel (11) is coupled to the controller (50) for operating the controller (50). The printer (12) is coupled to the controller (50) for printing.

8. The low pressure cleaning machine of any one of claims 1-7, wherein, One side of the cover (60) is rotatably connected to the housing (10), and the cover (60) is used to close the cleaning tank (20) or open the cleaning tank (20); The housing (10) is provided with a telescopic retainer (100), which includes a telescopic rod (101) and a telescopic cylinder (102). The telescopic rod (101) and the telescopic cylinder (102) are slidably connected. The bottom of the telescopic cylinder (102) is rotatably connected to the housing (10). The rotation direction of the telescopic cylinder (102) is the same as the rotation direction of the cover (60). The telescopic rod (101) is rotatably connected to the side of the cover (60) facing the cleaning tank (20). When the cover (60) is opened, the telescopic retainer (100) is used to hold the cover (60) open.

9. The low pressure cleaning machine of claim 8, wherein, A movable block (61) is provided on the front side of the cover (60), and the movable block (61) has a through hole (62); A fixed block (13) is provided on the housing (10). Limit blocks (14) extend upward from both ends of the fixed block (13). The movable block (61) is located between the two limit blocks (14). The two limit blocks (14) are provided with a waist-shaped hole (15) along the extension direction of the through hole (62). A rotating shaft (16) passes through the through hole (62) and the waist-shaped hole (15), so that the movable block (61) can rotate relative to the fixed block (13). The length direction of the waist-shaped hole (15) is the extension direction of the limit block (14), so that the movable block (61) and the rotating shaft (16) can move up and down relative to the fixed block (13). A sealing ring (110) is provided on the opening of the cleaning tank (20).

10. The low pressure cleaning machine of any one of claims 1-7, wherein, It also includes a fixed basket (120), which includes an upper ring (121) and a lower ring (122). The upper ring (121) and the lower ring (122) are connected by several railings (123). A bottom net (124) is provided inside the lower ring (122). A retaining tube (125) is provided on the outside of the upper ring (121). A pin (126) is provided on the outside of the lower ring (122). Multiple fixed baskets (120) can be connected in series by retaining tubes (125) and pins (126) to form a fixed cavity for placing cleaning items. The fixed basket (120) is used to separate the cleaning items in the cleaning tank (20) for cleaning.

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