Waterproofing device, pumping system, pumping machine and cleaning method

Abstract

The present invention provides a waterproof device, a pumping system, a pumping machine and a cleaning method. The oil cylinder includes a gland and a piston rod inserted in the gland. The waterproof device includes: a liquid inlet hole, which is arranged on the gland; a liquid outlet hole, which is arranged on the gland, and the liquid outlet hole and the liquid inlet hole are staggered; a sealing assembly, which is arranged between the gland and the piston rod; a liquid inlet assembly, which is connected to the liquid inlet hole; and a liquid outlet assembly, which is connected to the liquid outlet hole. In the technical solution of the present invention, the liquid inlet assembly can clean the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber. This avoids the problem in the prior art that the overflow element in the liquid outlet assembly cannot be opened or closed normally due to impurities in the pressure chamber blocking the overflow element, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly can work normally, and further ensure that the pumping work can be carried out normally.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproofing in a pumping system, and in particular to a waterproofing device, a pumping system, a pumping machine and a cleaning method. Background Art

[0002] The waterproof device in the prior art does not have a pre-cleaning function, that is, before the pumping system starts pumping, the waterproof device cannot complete the cleaning of its internal pressure chamber and the hydraulic pipelines and valve bodies connected to the pressure chamber. In this way, impurities such as oil-water mixture deposited in the pressure chamber can easily cause the valve core of the relief valve to get stuck or the action to get stuck, resulting in the relief valve being unable to open or close normally, and the sealing chamber (pressure chamber) being unable to build pressure, thereby causing the piston rod seal to fail, resulting in external moisture mixing with the hydraulic oil in the pressure cover of the waterproof device, causing the hydraulic oil to emulsify. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, an object of the present invention is to provide a waterproof device.

[0005] Another object of the present invention is to provide a pumping system.

[0006] Another object of the present invention is to provide a pumping machine.

[0007] Another object of the present invention is to provide a cleaning method.

[0008] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a waterproof device, the oil cylinder includes a pressure cover and a piston rod inserted in the pressure cover, the waterproof device includes: a liquid inlet hole, which is arranged on the pressure cover; a liquid outlet hole, which is arranged on the pressure cover, and the liquid outlet hole and the liquid inlet hole are staggered; a sealing assembly, which is arranged between the pressure cover and the piston rod; a liquid inlet assembly, which is connected to the liquid inlet hole; a liquid outlet assembly, which is connected to the liquid outlet hole; wherein an annular pressure chamber is formed between the sealing assembly, the pressure cover and the piston rod, the liquid inlet hole and the liquid outlet hole are both connected to the pressure chamber, the liquid inlet assembly is used to provide pressure oil to the pressure chamber, and the liquid outlet assembly is used to control the conduction or disconnection of the pressure chamber with the outside world.

[0009] In this technical solution, since the liquid outlet hole and the liquid inlet hole are arranged staggered, the pressure oil entering from the liquid inlet hole can circulate in the pressure chamber and then flow out from the liquid outlet assembly, so the liquid inlet assembly can clean the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber. This avoids the problem in the prior art that the overflow element in the liquid outlet assembly cannot be opened or closed normally due to impurities in the pressure chamber blocking the overflow element, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly can work normally, and avoids the problem that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0010] In addition, the waterproof device in the above embodiment provided by the present invention may also have the following additional technical features:

[0011] In the above technical solution, the liquid inlet component includes: an oil storage device; a liquid supply pipeline, one end of which is connected to the liquid inlet hole, and the other end of which is connected to the oil storage device; a hydraulic control valve group, which is arranged on the liquid supply pipeline and is used to adjust the liquid supply pressure of the liquid supply pipeline.

[0012] In this technical solution, the liquid supply pressure of the liquid supply pipeline is regulated by the hydraulic control valve group, that is, the oil pressure entering the liquid inlet hole is adjustable, so that hydraulic oil with higher pressure can be pumped into the pressure chamber, and the pressure chamber and the hydraulic pipeline and valve body connected thereto are cleaned, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly can work normally, avoiding the problem of the piston rod bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0013] In any of the above technical solutions, the hydraulic control valve group includes: a reversing valve, the reversing valve has a first connecting port, a second connecting port and a third connecting port, and the reversing valve is connected to the liquid supply pipeline through the first connecting port and the second connecting port; a connecting pipeline, one end of the connecting pipeline is connected to the third connecting port, and the other end of the connecting pipeline is connected to the liquid supply pipeline to form a connecting point, and the connecting point is located between the reversing valve and the liquid inlet hole; a first pressure reducing valve, the first pressure reducing valve is arranged on the liquid supply pipeline, and the first pressure reducing valve is located between the second connecting port and the connecting point.

[0014] In this technical solution, the reversing valve is operated to make the hydraulic oil enter the pressure chamber from the connecting pipeline. At this time, the hydraulic oil does not pass through the first pressure reducing valve. In this way, the hydraulic oil with a higher pressure can be pumped into the pressure chamber to clean the pressure chamber and the hydraulic pipeline and valve body connected thereto, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly can work normally, avoiding the problem of the piston rod bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0015] In any of the above technical solutions, the hydraulically controlled valve group further includes a second pressure reducing valve, which is arranged on the connecting pipeline, and a preset pressure value of the second pressure reducing valve is higher than a preset pressure value of the first pressure reducing valve.

[0016] In this technical solution, by reversing the reversing valve, the hydraulic oil enters the pressure chamber from the second pressure reducing valve. At this time, the hydraulic oil does not pass through the first pressure reducing valve, so that the hydraulic oil with a higher pressure can be pumped into the pressure chamber to clean the pressure chamber and the hydraulic pipeline and valve body connected thereto, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing component can work normally, avoiding the problem of the piston rod bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in the emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally. In addition, the second pressure reducing valve is set to adjust the liquid supply pressure of the connecting pipeline, which can effectively avoid the problem of the connecting pipeline being damaged by the excessively high liquid supply pressure, and at the same time ensure that the waterproof device has a good cleaning effect on the pressure chamber and the hydraulic pipeline and valve body connected thereto.

[0017] In any of the above technical solutions, the hydraulically controlled valve group includes: a first pressure reducing valve, which is arranged on the liquid supply pipeline; an on-off valve and a connecting pipeline, the on-off valve is arranged on the connecting pipeline, and the on-off valve is connected to the liquid supply pipeline in parallel with the first pressure reducing valve through the connecting pipeline; or, the hydraulically controlled valve group includes a pilot pressure reducing valve, which is arranged on the liquid supply pipeline.

[0018] In this technical solution, by operating the on-off valve, the hydraulic oil enters the pressure chamber from the connecting pipeline. At this time, the hydraulic oil does not pass through the first pressure reducing valve, so that the hydraulic oil with a higher pressure can be pumped into the pressure chamber, and the pressure chamber and the hydraulic pipeline and valve body connected thereto are cleaned, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing component can work normally, avoiding the problem that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in the emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally. The hydraulic oil with a higher pressure stored in the oil storage device is pumped into the pressure chamber through the pilot pressure reducing valve to clean the pressure chamber and the hydraulic pipeline and valve body connected thereto, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing component can work normally, avoiding the problem that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in the emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0019] In any of the above technical solutions, the liquid inlet component also includes: a stop valve, which is arranged on the liquid supply pipeline and is located between the oil storage device and the hydraulic control valve group; an accumulator, which is arranged on the liquid supply pipeline and is located between the oil storage device and the stop valve; a first one-way valve, which is arranged on the liquid supply pipeline and is located between the hydraulic control valve group and the liquid inlet hole, and the first one-way valve is unidirectional along the liquid supply direction of the liquid supply pipeline.

[0020] In this technical solution, the stop valve has the function of cutting off the oil flow. According to the actual situation, the stop valve can be opened or closed to connect or close the accumulator and the reversing valve, so as to meet the control requirements of the liquid inlet component. The accumulator can provide a stable oil pressure for the liquid supply pipeline. When it is necessary to clean the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber, the accumulator stably provides a high oil pressure for the liquid supply pipeline, thereby ensuring that the cleaning work can be carried out normally, and then ensuring that the pumping work can be carried out normally. In addition, the first check valve has a one-way flow function, so that the hydraulic oil in the liquid supply pipeline can only flow in the direction of the liquid supply, avoiding the hydraulic oil in the return line from flowing back into the liquid supply pipeline and affecting the normal operation of the liquid inlet component.

[0021] In any of the above technical solutions, the liquid outlet component includes: a return liquid pipeline, one end of which is connected to the liquid outlet hole; an overflow valve, which is arranged on the return liquid pipeline, and a preset pressure value of the overflow valve is lower than the preset pressure value of the second pressure reducing valve of the liquid inlet component, and higher than the preset pressure value of the first pressure reducing valve of the liquid inlet component; a second one-way valve, which is arranged on the return liquid pipeline and is located between the liquid outlet hole and the overflow valve, and the second one-way valve is unidirectionally conductive along the return liquid direction of the return liquid pipeline.

[0022] In this technical solution, the second one-way valve has a one-way flow function, so that the hydraulic oil in the return line can only flow in the direction of the return oil, preventing external impurities from reversely entering the pressure chamber when the overflow valve is stuck or blocked and affecting the normal operation of the liquid outlet component, thereby ensuring that the waterproof device can work normally. The preset pressure value of the overflow valve is set to be lower than the preset pressure value of the second pressure reducing valve, so that during the flushing operation, the overflow valve will overflow, thereby ensuring the cleaning effect of the waterproof device on the pressure chamber and the hydraulic pipeline and valve body connected thereto. The preset pressure value of the overflow valve is set to be higher than the preset pressure value of the first pressure reducing valve, so that during the pumping operation, the overflow valve will not overflow, thereby ensuring that the waterproof device can work normally.

[0023] In any of the above technical solutions, the reversing valve of the liquid inlet assembly is an electromagnetic reversing valve liquid inlet assembly, a zero-leakage electromagnetic reversing valve liquid inlet assembly, or a manual three-way ball valve liquid inlet assembly.

[0024] In this technical solution, the electromagnetic reversing valve is a common actuator in the field of electric control, which has the characteristics of simple structure, high reliability and high cost performance, which facilitates the later replacement and maintenance of the reversing valve, thereby reducing the manufacturing and maintenance costs of the waterproof device. The zero-leakage electromagnetic reversing valve has the characteristics of simple structure, high reliability and high cost performance, and also has a strong anti-leakage function, that is, the zero-leakage electromagnetic reversing valve is provided with two one-way valves compared to the traditional electromagnetic reversing valve, which ensures that the hydraulic oil in the zero-leakage electromagnetic reversing valve can only flow in the preset direction, thereby ensuring the reliability and stability of the zero-leakage electromagnetic reversing valve. The manual three-way ball valve has the characteristics of simple structure and high cost performance, and also has high reliability, that is, compared with the electromagnetic reversing valve, the manual three-way ball valve can be directly manually reversed without circuit control, so that the manual three-way ball valve has higher reliability.

[0025] The technical solution of the second aspect of the present invention provides a pumping system, which includes: a delivery cylinder; a main oil cylinder, on which a waterproof device as described in any one of the technical solutions of the first aspect is provided; wherein the piston rod of the main oil cylinder is connected to the piston rod of the delivery cylinder to drive the piston rod in the delivery cylinder to move, and the waterproof device is arranged on one end of the main oil cylinder close to the delivery cylinder.

[0026] The pumping system provided by the technical solution of the second aspect of the present invention includes the waterproof device of any one of the technical solutions of the first aspect, and thus has all the beneficial effects of any of the above technical solutions, which will not be repeated here.

[0027] In the above scheme, since the pumping system includes a waterproof device, the pumping system in the present application has the function of cleaning the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber, thereby avoiding the problem in the prior art that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, causing the hydraulic oil to emulsify, thereby ensuring that the pumping work can be carried out normally.

[0028] The technical solution of the third aspect of the present invention also provides a pumping machine, including any waterproof device of the technical solution of the first aspect, or the above-mentioned pumping system.

[0029] In the above scheme, since the pumping machinery includes a waterproof device or a pumping system, the pumping machinery in the present application has the function of cleaning the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber, thereby avoiding the problem in the prior art that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, causing the hydraulic oil to emulsify, thereby ensuring that the pumping work can be carried out normally.

[0030] The technical solution of the fourth aspect of the present invention provides a cleaning method, which is used for the pumping machinery of claim 10. The cleaning method includes: step S10, before the pumping machinery operates, starting the liquid inlet component to provide pressure oil to the pressure chamber, and controlling the liquid outlet component to make the pressure chamber conductive to the outside world.

[0031] The cleaning method provided by the technical solution of the fourth aspect of the present invention includes the pumping machinery in the technical solution of the third aspect, and thus has all the beneficial effects of any of the above technical solutions, which will not be described in detail here.

[0032] In the above scheme, through the above step S10, the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber can be cleaned. This avoids the problem in the prior art that the overflow element in the liquid outlet assembly is blocked by impurities in the pressure chamber, causing the overflow element to be unable to open or close normally, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly can work normally, and avoiding the problem that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, causing the hydraulic oil to emulsify, thereby ensuring that the pumping work can be carried out normally.

[0033] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 A schematic diagram of the structure of a waterproof device in the prior art is shown;

[0036] Figure 2 A schematic structural diagram of a waterproof device according to Embodiment 1 of the present invention is shown;

[0037] Figure 3 Shows Figure 2 A partial enlarged view of the waterproof device;

[0038] Figure 4 A schematic structural diagram of a waterproof device according to a second embodiment of the present invention is shown;

[0039] Figure 5 A schematic structural diagram of a waterproof device according to Embodiment 3 of the present invention is shown;

[0040] Figure 6 A schematic structural diagram of a waterproof device according to a fourth embodiment of the present invention is shown;

[0041] Figure 7 A schematic structural diagram of a waterproof device according to a fifth embodiment of the present invention is shown;

[0042] Figure 8 A schematic structural diagram of a waterproof device according to Embodiment 6 of the present invention is shown.

[0043] in, Figures 1 to 8 The corresponding relationship between the reference numerals and the component names is as follows:

[0044] 10. gland; 14. liquid inlet hole; 16. liquid outlet hole; 20. piston rod; 30. sealing assembly; 32. lip seal; 34. dust ring; 40. liquid inlet assembly; 41. oil storage device; 42. liquid supply pipeline; 44. hydraulic control valve group; 4411. solenoid reversing valve; 4412. first connection port; 4413. zero leakage solenoid reversing valve; 4414. second connection port; 4415. manual three-way ball valve; 4416. third connection port; 442. connecting pipeline; 444. first pressure reducing valve; 446. second pressure reducing valve; 448. on-off valve; 449. pilot pressure reducing valve; 46. stop valve; 48. accumulator; 49. first one-way valve; 70. liquid outlet assembly; 72. liquid return pipeline; 74. overflow valve; 76. second one-way valve; 50. pressure chamber; 60. connection point. DETAILED DESCRIPTION

[0045] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0047] It should be noted that the pumping mechanism is the core part of the concrete pump. The reciprocating motion of the hydraulic cylinder piston rod drives the delivery cylinder and concrete piston to achieve continuous operation of concrete suction and pumping. During the working process, the hydraulic cylinder piston rod is immersed in the washing chamber, which plays a role in cleaning, cooling and lubrication. When the hydraulic cylinder piston rod is retracted, it is easy to bring water in the washing chamber into the hydraulic oil, causing the hydraulic oil to emulsify and deteriorate. Figure 1 As shown, currently, a piston rod sealing device is generally used, that is, a group of lip seals 32 with lips facing each other form a pressure chamber 50 to seal the oil, and a group of dust rings 34 are used to block the invasion of external pollutants. The lip seal 32 is tightly attached to the piston rod 20 under the action of the pressure oil. When the piston rod 20 reciprocates, the oil film and water film attached to the piston rod 20 are scraped off by the seal and enter the pressure chamber 50. The pressure of the pressure chamber 50 continues to increase. When it increases to the pressure set by the relief valve 74, the relief valve 74 opens, and the oil-water mixture in the pressure chamber 50 overflows to the washing chamber through the relief valve 74. Since the working environment of the pumping device is extremely harsh, the washing chamber contains a large amount of mud and sand mixture, and some mud and other impurities will adhere to the surface of the piston rod 20 immersed in the washing chamber, and the dust ring 34 cannot completely scrape them clean. These mud and sand impurities attached to the surface of the piston rod 20 will enter the pressure chamber 50 under the scraping of the lip seal 32, so the oil-water mixture scraped from the pressure chamber contains a lot of impurities. These mixtures are deposited in the pressure chamber 50. When the pressure chamber 50 reaches the overflow pressure, the overflow valve 74 overflows. Impurities can easily cause the valve core of the overflow valve 74 to be directly stuck or the action to be stuck, resulting in the overflow valve 74 being unable to open or close normally, and the sealing chamber being unable to build pressure, thereby resulting in excessive system leakage, and even leading to the failure of the seal of the piston rod 20, resulting in emulsification of the system hydraulic oil.

[0048] like Figure 1 As shown, the waterproof device in the prior art does not have a system pre-flushing function. The oil-water mixed impurities deposited in the pressure chamber 50 will not overflow until the pressure chamber 50 slowly reaches the set pressure of the relief valve 74, which can easily cause the valve core of the relief valve 74 to get stuck, making the waterproof device ineffective. The valve core of the relief valve 74 is stuck, which is the biggest factor in the failure of the waterproof seal.

[0049] Refer to the following Figures 2 to 8 Waterproofing devices according to some embodiments of the present invention are described.

[0050] like Figures 2 to 8As shown, the present invention and the embodiments of the present invention provide a waterproof device, the oil cylinder includes a gland 10 and a piston rod 20 inserted in the gland 10, and the waterproof device includes a liquid inlet hole 14, a liquid outlet hole 16, a sealing assembly 30, a liquid inlet assembly 40 and a liquid outlet assembly 70. Among them, the liquid inlet hole 14 is arranged on the gland 10. The liquid outlet hole 16 is arranged on the gland 10, and the liquid outlet hole 16 and the liquid inlet hole 14 are staggered. The sealing assembly 30 is arranged between the gland 10 and the piston rod 20. The liquid inlet assembly 40 is connected to the liquid inlet hole 14. The liquid outlet assembly 70 is connected to the liquid outlet hole 16. An annular pressure chamber 50 is formed between the sealing assembly 30, the gland 10 and the piston rod 20, the liquid inlet hole 14 and the liquid outlet hole 16 are both connected to the pressure chamber 50, the liquid inlet assembly 40 is used to provide pressure oil to the pressure chamber 50, and the liquid outlet assembly 70 is used to control the conduction or disconnection of the pressure chamber 50 with the outside world.

[0051] In the above arrangement, since the liquid outlet hole 16 and the liquid inlet hole 14 are arranged staggered, the pressure oil entering from the liquid inlet hole 14 can circulate in the pressure chamber 50 and then flow out from the liquid outlet assembly 70 (by controlling the connection or disconnection between the pressure chamber 50 and the outside world), so the liquid inlet assembly 40 can clean the pressure chamber 50 and the hydraulic pipeline and valve body connected to the pressure chamber 50. This avoids the problem in the prior art that the overflow element in the liquid outlet assembly 70 cannot be opened or closed normally due to the impurities in the pressure chamber 50 blocking the overflow element, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly 30 can work normally, and avoiding the problem that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0052] It should be noted that the waterproof device in the present application has a cleaning function for the pressure chamber 50. The liquid inlet assembly 40 injects high-pressure hydraulic oil into the pressure chamber 50 to perform a high-pressure cleaning on the entire waterproof device to remove impurities deposited in the hydraulic pipeline, valve body and pressure chamber 50, thereby preventing the valve core of the overflow element from being stuck or blocked by impurities during pumping, resulting in the overflow element being unable to open or close normally. The above-mentioned overflow element refers to the overflow valve 74 in the present application.

[0053] Embodiment 1

[0054] There are many ways to control the connection or disconnection between the pressure chamber 50 and the outside world, such as Figure 2 and Figure 3As shown, in the first embodiment of the present invention, the liquid inlet assembly includes an oil storage device 41, a liquid supply pipeline 42 and a hydraulic control valve group 44. Among them, the liquid supply pipeline 42, one end of the liquid supply pipeline 42 is connected to the liquid inlet hole 14, and the other end of the liquid supply pipeline 42 is connected to the oil storage device 41; the hydraulic control valve group 44, the hydraulic control valve group 44 is arranged on the liquid supply pipeline 42, and is used to adjust the liquid supply pressure of the liquid supply pipeline 42; the liquid outlet assembly 70 includes a return liquid pipeline 72, an overflow valve 74 and a second one-way valve 76, wherein the return liquid pipeline 72, one end of the return liquid pipeline 72 is connected to the liquid outlet hole 16, and the overflow valve 74 is arranged on the return liquid pipeline 72.

[0055] In the above arrangement, the liquid supply pressure of the liquid supply pipeline is regulated by the hydraulic control valve group 44, that is, the oil pressure entering the liquid inlet hole 14 is adjustable, so that hydraulic oil with a higher pressure can be pumped into the pressure chamber 50, so that the overflow valve 74 is opened, and overflow is generated, thereby cleaning the pressure chamber 50 and the hydraulic pipeline and valve body connected thereto, thereby ensuring that the pressure chamber 50 always has a sealing oil pressure, so that the sealing assembly 30 can work normally, avoiding the problem of the piston rod 20 bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0056] like Figure 2 and Figure 3 As shown, in the first embodiment of the present invention, the hydraulic control valve group 44 includes a reversing valve, a connecting pipeline 442 and a first pressure reducing valve 444. The reversing valve has a first connecting port 4412, a second connecting port 4414 and a third connecting port 4416, and the reversing valve is connected to the liquid supply pipeline 42 through the first connecting port 4412 and the second connecting port 4414. One end of the connecting pipeline 442 is connected to the third connecting port 4416, and the other end of the connecting pipeline 442 is connected to the liquid supply pipeline 42 to form a connecting point 60, and the connecting point 60 is located between the reversing valve and the liquid inlet hole 14. The first pressure reducing valve 444 is arranged on the liquid supply pipeline 42, and the first pressure reducing valve 444 is located between the second connecting port 4414 and the connecting point 60.

[0057] In the above arrangement, the liquid supply pressure of the liquid supply pipeline is regulated by the hydraulic control valve group 44, that is, the oil pressure entering the liquid inlet hole 14 is adjustable, so that hydraulic oil with a higher pressure can be pumped into the pressure chamber 50, so that the overflow valve 74 is opened, and overflow is generated, thereby cleaning the pressure chamber 50 and the hydraulic pipeline and valve body connected thereto, thereby ensuring that the pressure chamber 50 always has a sealing oil pressure, so that the sealing assembly 30 can work normally, avoiding the problem of the piston rod 20 bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the seal of the piston rod 20, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0058] like Figure 2 and Figure 3 As shown, in the first embodiment of the present invention, the hydraulic control valve group 44 also includes a second pressure reducing valve 446 , which is disposed on the connecting pipeline 442 , and a preset pressure value of the second pressure reducing valve 446 is higher than a preset pressure value of the first pressure reducing valve 444 .

[0059] In the above arrangement, by reversing the reversing valve, the hydraulic oil enters the pressure chamber 50 from the second pressure reducing valve 446. At this time, the hydraulic oil does not pass through the first pressure reducing valve 444, so that the hydraulic oil with a higher pressure can be pumped into the pressure chamber 50, so that the overflow valve 74 is opened, overflow occurs, and the pressure chamber 50 and the hydraulic pipeline and valve body connected thereto are cleaned, thereby ensuring that the pressure chamber is always established with sealing oil pressure, so that the sealing assembly 30 can work normally, avoiding the problem that the piston rod 20 brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in hydraulic oil emulsification, thereby ensuring that the pumping work can be carried out normally. In addition, the second pressure reducing valve 446 is set to adjust the supply pressure of the connecting pipeline 442, which can effectively avoid the problem that the supply pressure of the connecting pipeline 442 is too high and causes the connecting pipeline 442 to be damaged, and at the same time ensure that the waterproof device has a good cleaning effect on the pressure chamber 50 and the hydraulic pipeline and valve body connected thereto.

[0060] It should be noted that when the pumping system is operating normally, the waterproof device is operating normally, and the hydraulic pressure enters the pressure chamber 50 from the first pressure reducing valve 444. The pressure value set by the first pressure reducing valve 444 is less than the overflow pressure of the overflow valve 74, so that the pressure chamber 50 can maintain pressure, and the sealing assembly 30 of the waterproof device can normally seal the piston rod 20, thereby ensuring that the waterproof device can work normally. Before the pumping system operates normally, it is necessary to clean the pressure chamber 50 inside the waterproof device and the hydraulic pipeline and valve body connected to the pressure chamber 50. By reversing the reversing valve, the hydraulic oil enters the pressure chamber 50 from the second pressure reducing valve 446. The pressure value set by the second pressure reducing valve 446 is higher than the overflow pressure of the overflow valve 74, so that the overflow valve 74 is opened, and the oil-water mixture impurities deposited in the pressure chamber 50 can be discharged from the overflow valve 74 with the oil flow, thereby realizing the self-cleaning function of the waterproof device.

[0061] like Figure 2 and Figure 3As shown, in the first embodiment of the present invention, the liquid inlet assembly 40 further includes a stop valve 46, an accumulator 48 and a first one-way valve 49. The stop valve 46 is arranged on the liquid supply pipeline 42, and the stop valve 46 is located between the oil storage device 41 and the hydraulic control valve group 44. The accumulator 48 is arranged on the liquid supply pipeline 42, and the accumulator 48 is located between the oil storage device 41 and the stop valve 46; the first one-way valve 49 is arranged on the liquid supply pipeline 42, and is located between the hydraulic control valve group 44 and the liquid inlet hole 14, and the first one-way valve 49 is unidirectional along the liquid supply direction of the liquid supply pipeline 42.

[0062] In the above arrangement, the stop valve 46 has the function of cutting off the oil flow. According to the actual situation, the stop valve 46 can be opened or closed to connect or close the accumulator 48 and the reversing valve, so as to meet the control requirements of the liquid inlet component 40. The accumulator 48 can provide a stable oil pressure for the liquid supply pipeline. When it is necessary to clean the pressure chamber 50 and the hydraulic pipeline and valve body connected to the pressure chamber 50, the accumulator 48 stably provides a high oil pressure for the liquid supply pipeline, thereby ensuring that the cleaning work can be carried out normally, and then ensuring that the pumping work can be carried out normally. In addition, the first check valve 49 has a one-way flow function, so that the hydraulic oil in the liquid supply pipeline can only flow in the direction of the liquid supply, avoiding the hydraulic oil in the return pipeline from flowing back into the liquid supply pipeline and affecting the normal operation of the liquid inlet component 40.

[0063] like Figure 2 and Figure 3 As shown, in the first embodiment of the present invention, the liquid outlet assembly 70 includes a liquid return pipeline 72, a relief valve 74 and a second one-way valve 76. Among them, the liquid return pipeline 72, one end of the liquid return pipeline 72 is connected to the liquid outlet hole 16. The relief valve 74 is arranged on the liquid return pipeline 72, and the preset pressure value of the relief valve 74 is lower than the preset pressure value of the second pressure reducing valve 446 of the liquid inlet assembly 40, and higher than the preset pressure value of the first pressure reducing valve 444 of the liquid inlet assembly 40. The second one-way valve 76 is arranged on the liquid return pipeline 72, and is located between the liquid outlet hole 16 and the relief valve 74, and the second one-way valve 76 is unidirectionally conducted along the liquid return direction of the liquid return pipeline 72.

[0064] In the above configuration, the second one-way valve 76 has a one-way flow function, so that the hydraulic oil in the return line can only flow in the direction of the return oil, preventing external impurities from reversely entering the pressure chamber 50 when the overflow valve is stuck or blocked, thereby affecting the normal operation of the liquid outlet component, thereby ensuring that the waterproof device can work normally. The preset pressure value of the overflow valve 74 is set to be lower than the preset pressure value of the second pressure reducing valve 446, so that during the flushing operation, the overflow valve 74 will overflow, thereby ensuring the cleaning effect of the waterproof device on the pressure chamber 50 and the hydraulic pipeline and valve body connected thereto. The preset pressure value of the overflow valve 74 is set to be higher than the preset pressure value of the first pressure reducing valve 444, so that during the pumping operation, the overflow valve 74 will not overflow, thereby ensuring that the waterproof device can work normally.

[0065] It should be noted that the oil storage device 41 stores hydraulic oil with relatively high pressure, and the oil pressure of the hydraulic oil in the oil storage device 41 and the accumulator 48 is higher than the preset pressure of the first pressure reducing valve 444 and the second pressure reducing valve 446 and the overflow pressure of the overflow valve 74 .

[0066] Specifically, Figure 2 As shown, in the first embodiment of the present invention, the reversing valve adopts an electromagnetic reversing valve 4411. In the above configuration, the electromagnetic reversing valve 4411 is a common actuator in the field of electric control, which has the characteristics of simple structure, high reliability and high cost performance, which facilitates the later replacement and maintenance of the reversing valve, thereby reducing the manufacturing and maintenance costs of the waterproof device.

[0067] Specifically, Figure 2 and Figure 3 As shown, in the first embodiment of the present invention, the sealing assembly 30 includes two lip-shaped sealing rings 32 that are arranged opposite to each other, and the liquid inlet hole 14 and the liquid outlet hole 16 are located between the two lip-shaped sealing rings 32 .

[0068] In the above configuration, the lip seal 32 is deformed under the action of oil pressure, the lip portion of the lip seal 32 opens, and the lip seal 32 is interference fit with the outer peripheral surface of the piston rod 20 and the inner wall surface of the gland 10, so that the lip seal 32 is completely fitted with the outer peripheral surface of the piston rod 20 and the inner wall surface of the gland 10, thereby preventing external moisture from entering the inner cavity of the gland 10, avoiding the problem of hydraulic oil emulsification and deterioration caused by the mixing of moisture with the hydraulic oil in the inner cavity, thereby ensuring that the waterproof device can work normally. In addition, the liquid inlet 14 is arranged between the two relatively arranged lip seals 32, so that the lip portion of the lip seal 32 faces the flow direction of the hydraulic oil, so that the lip portion can be opened quickly, thereby ensuring the stability and reliability of the sealing of the sealing assembly 30, thereby ensuring that the waterproof device can work normally, and the liquid outlet 16 is arranged between the two relatively arranged lip seals 32, which is convenient for the pressure relief of the pressure chamber 50 and the discharge of impurities such as oil-water mixture.

[0069] Specifically, Figure 2 and Figure 3 As shown, in the first embodiment of the present invention, the sealing assembly 30 includes two dustproof rings 34, and two lip seals 32 are arranged between the two dustproof rings 34. In the above arrangement, the dustproof ring 34 can prevent external pollutants from entering the inner cavity of the gland 10 to contaminate the hydraulic oil, thereby ensuring that the waterproof device can work normally.

[0070] The working process of the waterproof device in the first embodiment is described below:

[0071] Before the pumping operation, the cleaning mode is selected, the electromagnetic reversing valve 4411 is energized, the second pressure reducing valve 446 is connected to the oil circuit, and the hydraulic oil with a higher pressure enters the pressure chamber 50 through the second pressure reducing valve 446. Because the set pressure of the second pressure reducing valve 446 is higher than the overflow pressure of the overflow valve 74, the overflow valve 74 is opened, and the oil-water mixture impurities deposited in the pressure chamber 50 are directly overflowed through the overflow valve 74, thereby cleaning the pressure chamber 50 and the hydraulic pipeline and valve body connected to the pressure chamber 50.

[0072] During pumping operation, the pumping mode is switched, the electromagnetic reversing valve 4411 loses power, the first pressure reducing valve 444 is connected to the oil circuit, and the hydraulic oil with a higher pressure enters the pressure chamber 50 through the first pressure reducing valve 444. Because the set pressure of the first pressure reducing valve 444 is less than the overflow pressure of the overflow valve 74, the overflow valve 74 is temporarily closed. When the piston rod 20 reciprocates, the pressure in the pressure chamber 50 will slowly increase under the scraping action of the lip seal ring 32. When the overflow pressure is reached, the overflow valve 74 will open to overflow.

[0073] Embodiment 2

[0074] The differences between the second embodiment and the first embodiment are as follows:

[0075] Specifically, Figure 4 As shown, in the second embodiment of the present invention, the reversing valve adopts a zero-leakage electromagnetic reversing valve 4413.

[0076] In the above-mentioned setting, the zero-leakage solenoid reversing valve 4413 has the characteristics of simple structure, high reliability and high cost performance, and also has a strong anti-leakage function, that is, the zero-leakage solenoid reversing valve 4413 is provided with two one-way valves compared with the traditional solenoid reversing valve, which ensures that the hydraulic oil in the zero-leakage solenoid reversing valve can only flow in the preset direction, thereby ensuring the reliability and stability of the operation of the zero-leakage solenoid reversing valve 4413.

[0077] The other structures of the second embodiment are the same as those of the first embodiment and will not be described again here.

[0078] Embodiment 3

[0079] The differences between the third embodiment and the first embodiment are as follows:

[0080] like Figure 5 As shown, in the third embodiment of the present invention, the reversing valve adopts a manual three-way ball valve 4415. In the above configuration, the manual three-way ball valve 4415 has the characteristics of simple structure and high cost performance, and also has high reliability, that is, compared with the electromagnetic reversing valve, the manual three-way ball valve 4415 can be directly manually reversed without circuit control, so that the manual three-way ball valve 4415 has higher reliability.

[0081] The other structures of the third embodiment are the same as those of the first embodiment and will not be described again here.

[0082] Embodiment 4

[0083] The differences between the fourth embodiment and the first embodiment are as follows:

[0084] like Figure 6 As shown, in the fourth embodiment of the present invention, the hydraulic control valve group 44 includes a pilot pressure reducing valve 449 , and the pilot pressure reducing valve 449 is arranged on the liquid supply pipeline 42 .

[0085] In the above arrangement, hydraulic oil is pumped into the pressure chamber 50 through the pilot pressure reducing valve 449 to clean the pressure chamber 50 and the hydraulic pipes and valve bodies connected thereto, thereby ensuring that sealing oil pressure is always established in the pressure chamber 50, so that the sealing assembly 30 can work normally, avoiding the problem of the piston rod 20 bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the seal of the piston rod 20, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0086] It should be noted that the pilot pressure reducing valve 449 has a control oil circuit K, and the pressure of the pilot pressure reducing valve 449 can be set through the control oil circuit K. During pumping operation, the pressure of the pilot pressure reducing valve 449 is set to be lower than the overflow pressure of the overflow valve 74, and during cleaning operation, the pressure of the pilot pressure reducing valve 449 is set to be higher than the overflow pressure of the overflow valve 74. In this way, the pressure of the pilot pressure reducing valve 449 is set by using the control oil circuit K, thereby realizing the self-cleaning function of the waterproof device.

[0087] The other structures of the fourth embodiment are the same as those of the first embodiment and will not be described again here.

[0088] The differences between the fifth embodiment and the first embodiment are as follows:

[0089] like Figure 7 As shown, in the fifth embodiment of the present invention, the hydraulic control valve group 44 does not include the second pressure reducing valve 446 .

[0090] The other structures of the fifth embodiment are the same as those of the first embodiment and will not be described again here.

[0091] The differences between the sixth embodiment and the first embodiment are as follows:

[0092] like Figure 8 As shown, in the sixth embodiment of the present invention, the hydraulic control valve group 44 includes a first pressure reducing valve 444, an on-off valve 448 and a connecting pipeline 442. The first pressure reducing valve 444 is arranged on the liquid supply pipeline 42. The on-off valve 448 is arranged on the connecting pipeline 442, and the on-off valve 448 is connected to the liquid supply pipeline 42 in parallel with the first pressure reducing valve 444 through the connecting pipeline 442.

[0093] In the above arrangement, by operating the on-off valve 448, the hydraulic oil enters the pressure chamber 50 from the connecting pipeline. At this time, the hydraulic oil does not pass through the first pressure reducing valve 444, so that the hydraulic oil with a higher pressure can be pumped into the pressure chamber 50, and the pressure chamber 50 and the hydraulic pipeline and valve body connected thereto are cleaned, thereby ensuring that the pressure chamber 50 always has a sealing oil pressure, so that the sealing assembly 30 can work normally, avoiding the problem of the piston rod 20 bringing external moisture into the hydraulic oil inside the waterproof device due to the failure of the seal of the piston rod 20, resulting in the emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0094] The waterproof device in this application has the following advantages:

[0095] 1. The reversing valve is used to realize oil circuit switching, which is convenient for reversing.

[0096] 2. With cleaning function, it can wash away the deposited impurities with high-pressure oil to improve the cleanliness of the hydraulic system.

[0097] 3. It effectively prevents the valve core of the overflow valve 74 from getting stuck, improves the reliability of the waterproof device, and reduces the probability of hydraulic oil leakage and emulsification caused by valve core blockage.

[0098] 4. Adding a second one-way valve 76 can prevent impurities in the washing chamber from entering the pressure chamber in reverse when the overflow valve 74 is stuck or blocked.

[0099] 5. The pressure of the pilot pressure reducing valve 449 can be set according to actual needs, or the pressures of the first pressure reducing valve 444 and the second pressure reducing valve 446 can be set to achieve switching between the cleaning mode and the pumping mode.

[0100] The present invention also provides a pumping system, which includes: a delivery cylinder; a main oil cylinder, on which a waterproof device for the oil cylinder as described in any one of the technical solutions in the first aspect is provided; wherein the piston rod of the main oil cylinder is connected to the piston rod of the delivery cylinder to drive the piston rod 20 in the delivery cylinder to move, and the waterproof device is arranged on one end of the main oil cylinder close to the delivery cylinder.

[0101] In the above-mentioned arrangement, since the pumping system includes a waterproof device, the pumping system in the present application has the function of cleaning the pressure chamber 50 and the hydraulic pipeline and valve body connected to the pressure chamber 50, thereby avoiding the problem in the prior art that the piston rod 20 brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the seal of the piston rod 20, resulting in emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0102] The pumping system provided by the technical solution of the second aspect of the present invention includes the waterproof device of any one of the embodiments of the first aspect, and thus has all the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0103] The present invention also provides a pumping machine, comprising the waterproof device of any one of the embodiments of the first aspect, or the above-mentioned pumping system.

[0104] In the above-mentioned arrangement, since the pumping machinery includes a waterproof device or a pumping system, the pumping machinery in the present application has the function of cleaning the pressure chamber and the hydraulic pipeline and valve body connected to the pressure chamber, thereby avoiding the problem in the prior art that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, causing the hydraulic oil to emulsify, thereby ensuring that the pumping work can be carried out normally.

[0105] The present invention further provides a cleaning method for self-cleaning of a pumping system. The cleaning method utilizes the above-mentioned pumping machinery for cleaning. The cleaning method includes step S10 of utilizing the liquid inlet assembly 40 to clean the pressure chamber 50 .

[0106] Specifically, the cleaning step S10 in the first to third embodiments includes:

[0107] S01: Setting the pressure value of the second pressure reducing valve 446;

[0108] S03: energize the reversing valve;

[0109] S05: injecting hydraulic oil into the pressure chamber 50 for cleaning;

[0110] S07: The overflow valve 74 opens automatically to overflow and discharge impurities.

[0111] Specifically, the cleaning step S10 in the fourth embodiment includes:

[0112] S02: Setting the pressure value of the pilot pressure reducing valve 449;

[0113] S04: injecting hydraulic oil into the pressure chamber 50 for cleaning;

[0114] S06: The overflow valve 74 opens automatically to overflow and discharge impurities.

[0115] Specifically, the cleaning step S10 in the fifth embodiment includes:

[0116] S11: energize the reversing valve;

[0117] S13: injecting hydraulic oil into the pressure chamber 50 for cleaning;

[0118] S15: The overflow valve 74 opens automatically to overflow and discharge impurities.

[0119] Specifically, the cleaning step S10 in the fourth embodiment includes:

[0120] S12: Open the on-off valve 448;

[0121] S14: injecting hydraulic oil into the pressure chamber 50 for cleaning;

[0122] S16: The overflow valve 74 opens automatically to overflow and discharge impurities.

[0123] From the above description, it can be seen that the liquid inlet assembly 40 can clean the pressure chamber 50 and the hydraulic pipeline and valve body connected to the pressure chamber 50. This avoids the problem in the prior art that the overflow element in the liquid outlet assembly 70 cannot be opened or closed normally due to the impurities in the pressure chamber 50 blocking the overflow element, thereby ensuring that the pressure chamber always has a sealing oil pressure, so that the sealing assembly 30 can work normally, and avoids the problem that the piston rod brings external moisture into the hydraulic oil inside the waterproof device due to the failure of the piston rod seal, resulting in the emulsification of the hydraulic oil, thereby ensuring that the pumping work can be carried out normally.

[0124] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium.

[0125] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0126] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0127] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A waterproof device for an oil cylinder, the oil cylinder comprising a gland (10) and a piston rod (20) passing through the gland (10), characterized in that: The waterproof device comprises: A liquid inlet hole (14) is provided on the pressed cover (10); A liquid outlet hole (16) is arranged on the press cover (10), wherein the liquid outlet hole (16) and the liquid inlet hole (14) are arranged in a staggered manner; A sealing assembly (30), wherein the sealing assembly (30) is disposed between the gland (10) and the piston rod (20); A liquid inlet component (40), the liquid inlet component (40) being in communication with the liquid inlet hole (14); a liquid outlet component (70), the liquid outlet component (70) being in communication with the liquid outlet hole (16); An annular pressure chamber (50) is formed between the sealing assembly (30), the gland (10) and the piston rod (20); the liquid inlet hole (14) and the liquid outlet hole (16) are both connected to the pressure chamber (50); the liquid inlet assembly (40) is used to provide pressure oil to the pressure chamber (50); and the liquid outlet assembly (70) is used to control the connection or disconnection between the pressure chamber (50) and the outside world; The liquid inlet assembly (40) comprises: Oil storage device (41); A liquid supply pipeline (42), one end of the liquid supply pipeline (42) being in communication with the liquid inlet hole (14), and the other end of the liquid supply pipeline (42) being connected to the oil storage device (41); a hydraulically controlled valve group (44), the hydraulically controlled valve group (44) being arranged on the liquid supply pipeline (42) and being used for adjusting the liquid supply pressure of the liquid supply pipeline (42); The hydraulic control valve group (44) comprises: A reversing valve, the reversing valve having a first connecting port (4412), a second connecting port (4414) and a third connecting port (4416), the reversing valve being connected to the liquid supply pipeline (42) via the first connecting port (4412) and the second connecting port (4414); a connecting pipeline (442), one end of the connecting pipeline (442) being connected to the third connecting port (4416), and the other end of the connecting pipeline (442) being connected to the liquid supply pipeline (42) to form a connecting point (60), wherein the connecting point (60) is located between the reversing valve and the liquid inlet hole (14); A first pressure reducing valve (444), wherein the first pressure reducing valve (444) is disposed on the liquid supply pipeline (42), and the first pressure reducing valve (444) is located between the second connecting port (4414) and the connecting point (60).

2. The waterproof device according to claim 1, characterized in that: The hydraulically controlled valve group (44) further comprises a second pressure reducing valve (446), wherein the second pressure reducing valve (446) is arranged on the connecting pipeline (442), and a preset pressure value of the second pressure reducing valve (446) is higher than a preset pressure value of the first pressure reducing valve (444).

3. The waterproof device according to claim 1, characterized in that: The hydraulic control valve group (44) comprises: a first pressure reducing valve (444), the first pressure reducing valve (444) being arranged on the liquid supply pipeline (42); an on-off valve (448) and a connecting pipeline (442), wherein the on-off valve (448) is arranged on the connecting pipeline (442), and the on-off valve (448) is connected in parallel with the first pressure reducing valve (444) to the liquid supply pipeline (42) through the connecting pipeline (442); Alternatively, the hydraulically controlled valve group (44) comprises a pilot-operated pressure reducing valve (449), and the pilot-operated pressure reducing valve (449) is arranged on the liquid supply pipeline (42).

4. The waterproof device according to claim 1, characterized in that: The liquid inlet assembly (40) further comprises: a stop valve (46), the stop valve (46) being arranged on the liquid supply pipeline (42), and the stop valve (46) being located between the oil storage device (41) and the hydraulic control valve group (44); an accumulator (48), the accumulator (48) being arranged on the liquid supply pipeline (42), and the accumulator (48) being located between the oil storage device (41) and the stop valve (46); A first one-way valve (49), wherein the first one-way valve (49) is arranged on the liquid supply pipeline (42) and is located between the hydraulic control valve group (44) and the liquid inlet hole (14), and the first one-way valve (49) is unidirectionally conductive along the liquid supply direction of the liquid supply pipeline (42).

5. The waterproof device according to any one of claims 1 to 4, characterized in that: The liquid outlet component (70) comprises: a liquid return pipeline (72), one end of which is in communication with the liquid outlet (16); an overflow valve (74), the overflow valve (74) being arranged on the liquid return pipeline (72), the preset pressure value of the overflow valve (74) being lower than the preset pressure value of the second pressure reducing valve (446) of the liquid inlet assembly (40) and higher than the preset pressure value of the first pressure reducing valve (444) of the liquid inlet assembly (40); A second one-way valve (76), the second one-way valve (76) is arranged on the liquid return pipeline (72) and is located between the liquid outlet hole (16) and the overflow valve (74), and the second one-way valve (76) is unidirectionally conductive along the liquid return direction of the liquid return pipeline (72).

6. The waterproof device according to claim 1 or 2, characterized in that: The reversing valve is an electromagnetic reversing valve (4411) or a zero-leakage electromagnetic reversing valve (4413) or a manual three-way ball valve (4415).

7. A pumping system, characterized in that: The pumping system comprises: Delivery cylinder; A master oil cylinder, wherein the master oil cylinder is provided with a waterproof device as claimed in any one of claims 1 to 6; Among them, the piston rod of the main oil cylinder is connected with the piston rod of the delivery cylinder to drive the piston rod in the delivery cylinder to move, and the waterproof device is arranged on one end of the main oil cylinder close to the delivery cylinder.

8. A pumping machine, characterized in that: The waterproof device comprises the waterproof device as claimed in any one of claims 1 to 6, or the pumping system as claimed in claim 7.

9. A method for cleaning a pumping machine, characterized in that: The cleaning method is used for the pumping machine according to claim 8, and the cleaning method comprises: Step S10, before the pumping machine operates, the liquid inlet component (40) is started to provide pressure oil to the pressure chamber (50), and the liquid outlet component (70) is controlled to make the pressure chamber (50) conduct to the outside.

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