Pilot oil source valve of loading machine

Abstract

The utility model provides a pilot oil source valve of a loader, which relates to the technical field of pilot oil source valves and comprises a pilot oil source valve component, a filter component is arranged at one end of the pilot oil source valve component, a steering pump is arranged at one end of the filter component, and the pilot oil source valve component comprises a pilot oil source valve. A first port is formed in one end of the pilot oil source valve, one end of the first port is connected with a first right-angle pipeline, and a filter box is arranged at one end of the first right-angle pipeline. According to the oil source valve, impurities, particles and the like in pilot oil can be filtered out through the first-stage filter screen, meanwhile, the second-stage filter screen and the third-stage filter screen are matched for further filtering, it is guaranteed that dust and dirt in the pilot oil are comprehensively filtered out, faults caused by blockage of the oil source valve due to the impurities are avoided, and the service life of the oil source valve is prolonged. And the occurrence of equipment damage is reduced, the normal operation of the oil source valve is ensured, and the maintenance and repair cost of the oil source valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pilot oil source valves, in particular to a pilot oil source valve for a loader. Background Art

[0002] The pilot valve of the loader is an important part of the hydraulic control system, which controls the oil flow and direction of the hydraulic system. The pilot valve controls the oil circuit of the hydraulic mechanism by controlling the opening and closing of the main valve or proportional valve, thereby controlling the movement of the hydraulic cylinder. Therefore, the pilot valve plays a vital role in the operation of the hydraulic system.

[0003] The existing loader pilot oil source valve has been in use for a long time, and the seals have aged and fallen off, causing impurities to mix into the oil, resulting in blockage of the oil source valve, which in turn causes failures in the loader's lifting system. The valve core needs to be replaced frequently, but frequent replacement of the pilot oil source valve leads to high maintenance costs, which in turn increases maintenance costs. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the pilot oil source valve is frequently replaced, resulting in high repair costs and even maintenance costs, and proposes a loader pilot oil source valve.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a loader pilot oil source valve, including a pilot oil source valve assembly, a filter assembly is arranged at one end of the pilot oil source valve assembly, a steering pump is arranged at one end of the filter assembly, the pilot oil source valve assembly includes a pilot oil source valve, a first port is arranged at one end of the pilot oil source valve, a first right-angle pipe is connected to one end of the first port, a filter box is arranged at one end of the first right-angle pipe, a third-stage filter screen is arranged inside the filter box, a second-stage filter screen is arranged inside the filter box, the second-stage filter screen is arranged below the third-stage filter screen, a first-stage filter screen is arranged inside the filter box, and the first-stage filter screen is arranged below the second-stage filter screen.

[0006] Preferably, the inner wall of the filter box is symmetrically provided with a plurality of slide grooves, the side of the filter box is provided with a sealing plate, and the third-stage filter screen, the second-stage filter screen and the first-stage filter screen are slidably arranged inside the slide grooves.

[0007] Preferably, a second right-angle tube is connected to the bottom of the filter box, and one end of the second right-angle tube is connected to the steering pump.

[0008] Preferably, a control handle is provided on the top of the pilot oil source valve, a pressing plate is connected to the side of the control handle, a plunger is provided inside the pilot oil source valve, a metering spring is provided on the outside of the plunger, one end of the plunger is connected to a support seat, and a return spring is provided on the side of the support seat.

[0009] Preferably, a sliding valve is provided inside the pilot oil source valve, and a second port is provided at one end of the pilot oil source valve.

[0010] Preferably, the pilot oil supply plug is provided inside the pilot oil source valve, and an oil return chamber is opened inside the pilot oil source valve.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] 1. In the utility model, the first-stage filter is conducive to filtering out impurities, particulate matter, etc. in the pilot oil, ensuring the cleanliness of the pilot oil. At the same time, the second-stage filter and the third-stage filter are conducive to further filtering, ensuring that the dust and dirt inside the pilot oil are fully filtered out, avoiding the failure of the oil source valve due to clogging by impurities, reducing the occurrence of equipment damage, ensuring the normal operation of the oil source valve, reducing the maintenance and repair cost of the oil source valve, and reducing the downtime of the equipment, thereby improving the working efficiency of the equipment.

[0013] 2. In the utility model, by moving the third-stage filter, the second-stage filter and the first-stage filter inside the slide groove and then opening the sealing plate, it is convenient to clean and replace the third-stage filter, the second-stage filter and the first-stage filter, the operation is convenient, the maintenance and replacement time is shortened, the equipment downtime is reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model provides a three-dimensional structural schematic diagram of a pilot oil source valve for a loader;

[0015] Figure 2 Another perspective structural diagram of a pilot oil source valve for a loader proposed by the utility model;

[0016] Figure 3 The utility model provides a structural schematic diagram of a filter assembly of a pilot oil source valve of a loader;

[0017] Figure 4 The utility model provides a cross-sectional structural schematic diagram of a pilot oil source valve of a loader pilot oil source valve.

[0018] Legend: 1. Pilot oil source valve assembly; 101. Pilot oil source valve; 102. Operating handle; 103. Plunger; 104. Return spring; 105. Sliding valve; 106. First port; 107. Second port; 108. Pilot oil for plug; 109. Return oil chamber; 110. Metering spring; 111. Support seat; 112. Press plate; 2. Filter assembly; 201. Sealing plate; 202. Filter box; 203. Slide; 204. Third-stage filter; 205. Second-stage filter; 206. First-stage filter; 3. Steering pump. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and 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.

[0020] 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 than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. Example 1

[0021] like Figure 1-Figure 4 As shown, the utility model provides a technical solution: a loader pilot oil source valve, including a pilot oil source valve assembly 1, a filter assembly 2 is arranged at one end of the pilot oil source valve assembly 1, a steering pump 3 is arranged at one end of the filter assembly 2, the pilot oil source valve assembly 1 includes a pilot oil source valve 101, a first port 106 is arranged at one end of the pilot oil source valve 101, a first right-angle pipe is connected to one end of the first port 106, a filter box 202 is arranged at one end of the first right-angle pipe, a third-stage filter screen 204 is arranged inside the filter box 202, and a second-stage filter screen 204 is arranged inside the filter box 202. The filter box 202 is provided with a first-stage filter 206, and the first-stage filter 206 is provided below the second-stage filter 205. The inner wall of the filter box 202 is symmetrically provided with a plurality of slide grooves 203. The side of the filter box 202 is provided with a sealing plate 201. The third-stage filter 204, the second-stage filter 205 and the first-stage filter 206 are slidably provided inside the slide grooves 203. The bottom of the filter box 202 is connected with a second right-angle tube, and one end of the second right-angle tube is connected to the steering pump 3.

[0022] In this embodiment, the first-stage filter 206 is helpful to filter out impurities, particulate matter, etc. in the pilot oil, ensuring the cleanliness of the pilot oil. At the same time, the second-stage filter 205 and the third-stage filter 204 are helpful for further filtering, ensuring that the dust and dirt inside the pilot oil are fully filtered out, avoiding the failure of the oil source valve due to clogging by impurities, reducing the occurrence of equipment damage, ensuring the normal operation of the oil source valve, reducing the maintenance and repair cost of the oil source valve, and reducing the downtime of the equipment, thereby improving the working efficiency of the equipment. The first right-angle tube and the second right-angle tube are provided on the side of the filter box 202, which is helpful for buffering the oil pressure. By moving the third-stage filter 204, the second-stage filter 205 and the first-stage filter 206 inside the slide 203, and then opening the sealing plate 201, it is convenient to clean and replace the third-stage filter 204, the second-stage filter 205 and the first-stage filter 206, which is easy to operate, shortens the maintenance and replacement time, reduces the equipment downtime, and improves the working efficiency. Example 2

[0023] like Figure 1-Figure 4 As shown, a control handle 102 is provided on the top of the pilot oil source valve 101, a pressing plate 112 is connected to the side of the control handle 102, a plunger 103 is provided inside the pilot oil source valve 101, a metering spring 110 is provided on the outside of the plunger 103, one end of the plunger 103 is connected to a support seat 111, a return spring 104 is provided on the side of the support seat 111, a sliding valve 105 is provided inside the pilot oil source valve 101, a second port 107 is provided at one end of the pilot oil source valve 101, a supply plug pilot oil 108 is provided inside the pilot oil source valve 101, and an oil return chamber 109 is opened inside the pilot oil source valve 101.

[0024] In this embodiment, when the operating handle 102 is moved, the operating handle 102 contacts the plunger 103 and overcomes the spring force of the metering spring 110 to push it downward. The plunger 103 will contact the slide valve 105 and overcome the spring force of the slide valve 105 to move it downward. The movement amount of the slide valve 105 depends on the movement amount of the operating handle 102. When the slide valve 105 moves downward, the return oil passage of the oil flowing to the control valve will be closed, and the pilot pressurized oil flowing to the control valve to move the control slide valve will be metered. The more pilot oil flows to the control slide valve, the greater the movement amount of the control slide valve. When the oil pressure of the pilot line connected to the control valve increases, the oil pressure completely overcomes the force of the slide valve 105 and the metering spring 110, and moves the slide valve 105 upward to a balanced position, so that the pilot pressure in the pilot line remains constant, which will maintain the position of the control slide valve in the control valve until the operating handle is moved. In short, once the operating handle 102 is moved, the pilot valve becomes a pressure reducing valve, keeping the downstream pressure equal to the spring force above the slide valve 105. When the operating handle 102 is released, the return spring moves the slide valve 105 upward, and the operating handle 102 will return to the middle position. When this happens, the slide valve 105 cuts off the pilot oil flow to the control valve, thereby making it impossible to move the control slide valve. The pilot oil at the control slide valve flows back to the oil tank through the slide valve 105.

[0025] The working principle of this embodiment is as follows: when in use, firstly, the first-stage filter 206 is used to filter out impurities, particles, etc. in the pilot oil, thereby ensuring the cleanliness of the pilot oil. Meanwhile, the second-stage filter 205 and the third-stage filter 204 are used to further filter, thereby ensuring that the dust and dirt inside the pilot oil are completely filtered out. Then, when the operating handle 102 is moved, the operating handle 102 contacts the plunger 103 and overcomes the spring force of the metering spring 110 to push it downward. The plunger 103 contacts the slide valve 105 and overcomes the spring force of the slide valve 105 to move it downward. The oil pressure overcomes the forces of the slide valve 105 and the metering spring 110, and moves the slide valve 105 upward to a balanced position, so that the pilot pressure in the pilot line remains constant. Once the operating handle 102 is moved, the pilot valve becomes a pressure reducing valve, keeping the downstream pressure equal to the spring force above the slide valve 105. When the operating handle 102 is released, the return spring moves the slide valve 105 upward, and the operating handle 102 will return to the neutral position. When this happens, the slide valve 105 cuts off the pilot oil flow to the control valve, thereby preventing the control slide valve from moving, and the pilot oil at the control slide valve flows back to the oil tank through the slide valve 105.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pilot oil source valve for a loader, comprising a pilot oil source valve assembly (1), characterized in that: A filter assembly (2) is disposed at one end of the pilot oil source valve assembly (1), and a steering pump (3) is disposed at one end of the filter assembly (2). The pilot oil source valve assembly (1) comprises a pilot oil source valve (101), and a first port (106) is disposed at one end of the pilot oil source valve (101). One end of the first port (106) is connected to a first right-angle pipe, and one end of the first right-angle pipe is disposed at a filter box (202). A third-stage filter screen (204) is disposed inside the filter box (202). A second-stage filter screen (205) is disposed inside the filter box (202), and the second-stage filter screen (205) is disposed below the third-stage filter screen (204). A first-stage filter screen (206) is disposed inside the filter box (202), and the first-stage filter screen (206) is disposed below the second-stage filter screen (205).

2. The loader pilot oil source valve according to claim 1, characterized in that: The inner wall of the filter box (202) is symmetrically provided with a plurality of slide grooves (203), the side of the filter box (202) is provided with a sealing plate (201), and the third-stage filter screen (204), the second-stage filter screen (205) and the first-stage filter screen (206) are slidably arranged inside the slide grooves (203).

3. The pilot oil source valve for a loader according to claim 1, characterized in that: A second right-angle tube is connected to the bottom of the filter box (202), and one end of the second right-angle tube is connected to the steering pump (3).

4. The loader pilot oil source valve according to claim 1, characterized in that: A control handle (102) is arranged on the top of the pilot oil source valve (101), a pressing plate (112) is connected to the side of the control handle (102), a plunger (103) is arranged inside the pilot oil source valve (101), a metering spring (110) is arranged on the outside of the plunger (103), one end of the plunger (103) is connected to a support seat (111), and a return spring (104) is arranged on the side of the support seat (111).

5. The pilot oil source valve for a loader according to claim 4, characterized in that: A slide valve (105) is arranged inside the pilot oil source valve (101), and a second port (107) is arranged at one end of the pilot oil source valve (101).

6. The pilot oil source valve for a loader according to claim 5, characterized in that: The pilot oil source valve (101) is provided with a supply plug pilot oil (108) inside, and the pilot oil source valve (101) is provided with an oil return chamber (109) inside.

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