Hydraulic valve for high-pressure hydraulic system of milling excavator

Abstract

The utility model relates to the technical field of hydraulic valves, and discloses a hydraulic valve for a high-pressure hydraulic system of a milling excavator, which comprises a device body, a valve body is arranged in the device body, an oil inlet is arranged on the right side in the valve body, a flow cavity is arranged on the left side of the oil inlet, a sliding plug is arranged in the flow cavity, and a valve rod is arranged in the sliding plug. A valve element is fixedly connected to the left side of the sliding plug, pistons are fixedly connected to the left side and the right side of the exterior of the valve element, abutting seats are arranged on the corresponding sides of the pistons, an abutting block is fixedly connected to the left side of the interior of the valve body, and first springs are arranged outside the abutting block and the left side of the valve element; the right side of the exterior of the valve body is fixedly connected with a connecting assembly. According to the hydraulic valve, the piston is tightly attached to the abutting seat when the hydraulic valve does not work, the oil leakage condition is avoided, connection between the hydraulic valve and the pipe fitting is conveniently disassembled, and the maintenance time of the pipe fitting and the hydraulic valve is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a hydraulic valve for a high-pressure hydraulic system of a milling excavator. Background Art

[0002] The high-pressure hydraulic system of a milling machine usually requires the use of various hydraulic valves to control the flow direction, pressure and flow of the fluid to achieve various functions.

[0003] A traditional hydraulic valve is composed of a hydraulic valve body, a piston, a spring and an oil leakage one-way valve to achieve operation. However, after a period of use, friction between the piston and the piston hole produces a gap, and oil leakage occurs under liquid pressure whether the valve is working or not, and the valve needs to be replaced frequently. Therefore, a technician in this field provides a hydraulic valve for a high-pressure hydraulic system of a milling machine to solve the problems raised in the above background technology. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a hydraulic valve for the high-pressure hydraulic system of a milling excavator, aiming to improve the problem in the prior art that a gap is generated by friction between the piston and the piston hole after a period of use, and oil leakage occurs under liquid pressure regardless of whether it is working or not, and frequent replacement is required.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic valve for a high-pressure hydraulic system of a milling excavator, comprising a device body, a valve body is arranged inside the device body, an oil inlet is opened on the right side of the interior of the valve body, a flow chamber is opened on the left side of the oil inlet, a sliding plug is arranged inside the flow chamber, a valve core is fixedly connected to the left side of the sliding plug, pistons are fixedly connected to the left and right sides of the exterior of the valve core, a stop seat is arranged on the corresponding side of the piston, a stop block is fixedly connected to the left side of the interior of the valve body, a first spring is arranged on the outside of the stop block and the left side of the valve core, and a connecting component is fixedly connected to the right side of the exterior of the valve body.

[0006] As a further description of the above technical solution:

[0007] The connecting assembly includes a second connecting member, which is fixedly connected to the outer right side of the valve body, the outer part of the second connecting member is fixedly connected to a mounting sleeve, the inner right side of the mounting sleeve is slidably connected to a first connecting member, the first connecting member is fitted with the second connecting member, and the right side of the first connecting member is fixedly connected to a connecting pipe.

[0008] As a further description of the above technical solution:

[0009] The outside of the installation sleeve can be fixedly connected with support members all around, the inside of the support member is slidably connected with an insertion rod, one end of the insertion rod is fixedly connected with a pull block, and one side of the pull block is fixedly connected with a second spring.

[0010] As a further description of the above technical solution:

[0011] The insertion rod is slidably connected to the four inner corners of the installation sleeve and the first connecting member.

[0012] As a further description of the above technical solution:

[0013] The other end of the second spring is fixedly connected to one side of the support member, and the second spring is arranged outside the insertion rod.

[0014] As a further description of the above technical solution:

[0015] An oil outlet is arranged on the upper part of the valve body.

[0016] As a further description of the above technical solution:

[0017] The piston is slidably connected inside the dowel seat.

[0018] As a further description of the above technical solution:

[0019] One end of the first spring is fixedly connected to one side of the left piston, and the other end of the first spring is fixedly connected to the left side of the inner wall of the valve body.

[0020] The utility model has the following beneficial effects:

[0021] 1. In the utility model, by using the oil inlet, valve body, sliding plug, flow chamber, valve core, piston, retaining seat, oil outlet, first spring and other structures in coordination, the piston and retaining seat are in close contact when the hydraulic valve is not working, thus avoiding oil leakage.

[0022] 2. In the utility model, by using the pull block, the insert rod, the first connecting piece, the connecting pipe, the second connecting piece, the installation sleeve and other structures in coordination, the connection between the hydraulic valve and the pipe fitting can be conveniently disassembled, thereby reducing the maintenance time of the pipe fitting and the hydraulic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a hydraulic valve for a high-pressure hydraulic system of a milling machine proposed by the utility model;

[0024] Figure 2 This is a schematic diagram of the valve body structure of a hydraulic valve for a high-pressure hydraulic system of a milling and excavating machine proposed by the utility model;

[0025] Figure 3This is a partial disassembled diagram of a valve body of a hydraulic valve for a high-pressure hydraulic system of a milling machine proposed in the utility model;

[0026] Figure 4 This is a cross-sectional view of a valve body of a hydraulic valve for a high-pressure hydraulic system of a milling machine proposed in the utility model;

[0027] Figure 5 for Figure 3 Enlarged view of point A.

[0028] Legend:

[0029] 1. Device body; 2. Valve body; 3. Oil outlet; 4. Mounting sleeve; 5. Connecting pipe; 6. First connecting piece; 7. Second connecting piece; 8. Oil inlet; 9. Sliding plug; 10. Flow chamber; 11. Piston; 12. Valve core; 13. First spring; 14. Stop block; 15. Pull block; 16. Second spring; 17. Support member; 18. Insert rod; 19. Stop seat. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Reference Figure 1 , Figure 2 and Figure 4 , the utility model provides an embodiment: a hydraulic valve for a high-pressure hydraulic system of a milling excavator, comprising a device body 1, a valve body 2 is arranged inside the device body 1, an oil inlet 8 is opened on the right side of the inside of the valve body 2, a flow chamber 10 is opened on the left side of the oil inlet 8, a sliding plug 9 is arranged inside the flow chamber 10, a valve core 12 is fixedly connected to the left side of the sliding plug 9, a piston 11 is fixedly connected to the left and right sides of the outside of the valve core 12, a stopper 19 is arranged on the corresponding side of the piston 11, a stopper 14 is fixedly connected to the left side of the inside of the valve body 2, a first spring 13 is arranged on the left side of the stopper 14 and the valve core 12, a connecting assembly is fixedly connected to the right side of the outside of the valve body 2, an oil outlet 3 is arranged on the upper part of the valve body 2, the piston 11 is slidably connected to the inside of the stopper 19, one end of the first spring 13 is fixedly connected to one side of the left piston 11, and the other end of the first spring 13 is fixedly connected to the left side of the inner wall of the valve body 2;

[0032] The connecting assembly includes a second connecting member 7, which is fixedly connected to the outer right side of the valve body 2. The outer part of the second connecting member 7 is fixedly connected to the mounting sleeve 4, and the inner right side of the mounting sleeve 4 is slidably connected to the first connecting member 6. The first connecting member 6 is fitted with the second connecting member 7, and the right side of the first connecting member 6 is fixedly connected to the connecting pipe 5.

[0033] The oil enters the valve body 2 through the oil inlet 8, so that the sliding plug 9 is pushed to separate from the oil inlet 8, and the oil enters the flow chamber 10. The movement of the sliding plug 9 drives the valve core 12 to move to the left, so that the right piston 11 moves into the inside of the right side seat 19. The inner diameter of the right side seat 19 is wider than the diameter of the piston 11, so that the oil can flow to the oil outlet 3, and at the same time drives the left piston 11 to move and separate from the left side seat 19, and squeezes the first spring 13 to generate a rebound force, and the oil flows out of the oil outlet 3. When the hydraulic valve is no longer in operation, the rebound force of the first spring 13 drives the left piston 11 to move to the right, so that it is close to the seat 19, and the sliding plug 9 is pushed by the valve core 12 to block the oil inlet 8, so that the piston 11 is close to the seat 19 when the hydraulic valve is not working, thereby avoiding oil leakage.

[0034] Reference Figure 2 , Figure 3 and Figure 5 The outside of the mounting sleeve 4 can be fixedly connected with support members 17 on all sides, the inside of the support member 17 is slidably connected with an insertion rod 18, one end of the insertion rod 18 is fixedly connected with a pull block 15, one side of the pull block 15 is fixedly connected with a second spring 16, the insertion rod 18 is slidably connected to the four internal corners of the mounting sleeve 4 and the first connecting member 6, the other end of the second spring 16 is fixedly connected to one side of the support member 17, and the second spring 16 is arranged on the outside of the insertion rod 18.

[0035] By pulling the pull block 15, the insertion rod 18 is moved upward, and at the same time the second spring 16 is pulled to pull the connecting pipe 5, so that the insertion rod 18 is separated from the first connecting piece 6, and the connecting pipe 5 is pulled to move the first connecting piece 6, and the second connecting piece 7 is separated and moved out of the installation sleeve 4, so that the hydraulic valve and pipe fittings can be quickly and conveniently disassembled or installed, reducing the maintenance time of the pipe fittings and the hydraulic valve.

[0036] Working principle: when the hydraulic valve needs to be used, the oil enters the interior of the valve body 2 through the oil inlet 8, pushes the sliding plug 9, and makes the oil enter the interior of the flow chamber 10. The sliding plug 9 is pushed to make the valve core 12 drive the piston 11 to move, so that the left piston 11 is separated from the retaining seat 19, and the oil flows out from the oil outlet 3 through the retaining seat 19. When the valve body 2 is not working, the left piston 11 is pushed by the first spring 13 to make it close to the retaining seat 19, so that the piston 11 is close to the retaining seat 19 when the hydraulic valve is not working, and oil leakage is avoided; by pulling the pull block 15 to drive the plug rod 18 to move and separate it from the first connecting piece 6, the connecting pipe 5 is pulled to move it out of the interior of the mounting sleeve 4, so that the connection between the hydraulic valve and the pipe fittings can be conveniently disassembled, and the maintenance time of the pipe fittings and the hydraulic valve is reduced.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic valve for a high-pressure hydraulic system of a milling machine, comprising a device body (1), characterized in that: A valve body (2) is arranged inside the device body (1), an oil inlet (8) is opened on the right side inside the valve body (2), a flow chamber (10) is opened on the left side of the oil inlet (8), a sliding plug (9) is arranged inside the flow chamber (10), a valve core (12) is fixedly connected to the left side of the sliding plug (9), a piston (11) is fixedly connected to the left and right sides of the outside of the valve core (12), a stopper (19) is arranged on the corresponding side of the piston (11), a stopper (14) is fixedly connected to the left side of the inside of the valve body (2), a first spring (13) is arranged on the outside of the stopper (14) and the left side of the valve core (12), and a connecting component is fixedly connected to the right side of the outside of the valve body (2).

2. A hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 1, characterized in that: The connecting assembly comprises a second connecting member (7), the second connecting member (7) is fixedly connected to the outer right side of the valve body (2), the outer part of the second connecting member (7) is fixedly connected to a mounting sleeve (4), the inner right side of the mounting sleeve (4) is slidably connected to a first connecting member (6), the first connecting member (6) is fitted with the second connecting member (7), and the right side of the first connecting member (6) is fixedly connected to a connecting pipe (5).

3. A hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 2, characterized in that: The outside of the installation sleeve (4) can be fixedly connected to support members (17) all around, the inside of the support member (17) is slidably connected to an insertion rod (18), one end of the insertion rod (18) is fixedly connected to a pull block (15), and one side of the pull block (15) is fixedly connected to a second spring (16).

4. A hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 3, characterized in that: The insertion rod (18) is slidably connected to the four inner corners of the installation sleeve (4) and the first connecting member (6).

5. The hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 3, characterized in that: The other end of the second spring (16) is fixedly connected to one side of the support member (17), and the second spring (16) is arranged outside the insertion rod (18).

6. A hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 1, characterized in that: An oil outlet (3) is provided on the upper portion of the valve body (2).

7. The hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 1, characterized in that: The piston (11) is slidably connected inside the stop (19).

8. The hydraulic valve for a high-pressure hydraulic system of a milling machine according to claim 1, characterized in that: One end of the first spring (13) is fixedly connected to one side of the left piston (11), and the other end of the first spring (13) is fixedly connected to the left side of the inner wall of the valve body (2).

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