Novel oil way unloading device

Abstract

A novel oil way unloading device comprises a valve body mounting seat, a cone valve is arranged between an oil port P and an oil return port T of the valve body mounting seat, a spring I is arranged at the upper end of the cone valve, and the lower end of the cone valve abuts against the oil port P under the action of the spring I; a pilot valve block is connected to the upper end of the valve body mounting seat, a pilot valve element is arranged between a pilot oil inlet A and a guide stage oil outlet B of the pilot valve block, the pilot valve element blocks communication of the pilot oil inlet A and the guide stage oil outlet B under the action of a spring II, and a control port K used for controlling the pilot valve element to move is formed in the valve body mounting seat; the cone valve is of a hollow structure, oil liquid enters the pilot oil inlet A through the hollow structure of the cone valve, and the pilot stage oil outlet B communicates with the oil return opening T. According to the novel oil way unloading device, a hydraulic control pilot mode is directly adopted, the number of parts is effectively reduced by reasonably designing a pilot level oil way structure and a main level oil way structure, the structure is simple, economical efficiency is good, and meanwhile the unloading or oil guiding function of a loop can be achieved according to working condition requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a novel oil circuit unloading device. Background Art

[0002] In the hydraulic system of construction machinery, in order to reduce the power loss of the system when the pump source is in the neutral standby state, the system is often required to be in a low-pressure unloading state. Or when the main system pressure is abnormal, it is often necessary to add an emergency unloading oil circuit to protect the safety of system components.

[0003] The existing unloading valves and unloading oil circuits generally have the following disadvantages: 1. The solenoid valve is used as the pilot stage to realize the switch unloading. This structure has a large installation space, high cost of the whole valve, and the solenoid valve itself is affected by the environment and has poor reliability. 2. It is not versatile and cannot meet the compatibility of switch quantity and proportional quantity. At the same time, it cannot realize the oil guiding function in the non-unloading state, and has poor adaptability to working conditions. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a new oil circuit unloading device with simple structure and good effect.

[0005] The utility model is realized by the following technical scheme: a novel oil circuit unloading device comprises a valve body mounting seat, a cone valve is arranged between the oil port P and the oil return port T of the valve body mounting seat, a spring I is arranged at the upper end of the cone valve, and the lower end of the cone valve is pressed on the oil port P under the action of the spring I; a pilot valve block is connected to the upper end of the valve body mounting seat, a pilot valve core is arranged between the pilot oil inlet A and the pilot oil outlet B of the pilot valve block, the pilot valve core blocks the communication between the pilot oil inlet A and the pilot oil outlet B under the action of the spring II, and a control port K for controlling the movement of the pilot valve core is arranged on the valve body mounting seat; the cone valve is a hollow structure, and the oil enters the pilot oil inlet A through the hollow structure of the cone valve, and the pilot oil outlet B is communicated with the oil return port T.

[0006] It is further provided that: a cone valve damping hole is provided at the inlet end of the cone valve.

[0007] The spring I is provided with a spring seat I for use with it.

[0008] The pilot valve block is connected to the valve body mounting seat through screws.

[0009] The pilot valve core is provided with an annular groove for facilitating the communication between the pilot oil inlet A and the pilot oil outlet B.

[0010] A plug is provided at the position where the pilot valve core is installed on the pilot valve block, a spring seat II is provided on the control pilot valve core, and the spring II is arranged between the plug and the spring seat II.

[0011] An O-ring II is arranged on the side of the plug contacting the pilot valve block.

[0012] The plug is connected to the pilot valve block through threads.

[0013] The pilot valve block is provided with an O-ring I and an O-ring III at the connection between the pilot oil inlet A and the pilot oil outlet B and the valve body mounting seat respectively.

[0014] The utility model has the following advantages: the novel oil circuit unloading device of the utility model directly adopts the hydraulic pilot mode, and effectively reduces the number of parts by reasonably designing the pilot stage and main stage oil circuit structures, has a simple structure and good economy, and at the same time, the circuit can realize the unloading or oil guiding function according to the working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0016] In the attached picture:

[0017] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 2 and Figure 3 This is a schematic diagram of the structure and hydraulic principle of the utility model when the control port K does not pass the control oil;

[0019] Figure 4 and Figure 5 This is a schematic diagram of the structure and hydraulic principle of the utility model when the control port K is connected to the control oil;

[0020] Figure 6 It is a schematic diagram of the overall structure of the utility model.

[0021] In the figure: 1. oil port P, 2. valve body mounting seat, 3. cone valve damping hole, 4. cone valve, 5. spring Ⅰ, 6. O-ring Ⅰ, 7. spring seat Ⅰ, 8. pilot valve core, 9. pilot valve block, 10. control port K, 11. pilot oil inlet port A, 12. spring seat Ⅱ, 13. oil unloading port Dr, 14. spring Ⅱ, 15. O-ring Ⅱ, 16. plug, 17. pilot oil outlet port B, 18. O-ring Ⅲ, 19. oil return port T.

[0022] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figures 1 to 6A novel oil circuit unloading device shown in the figure comprises a valve body mounting seat 2, a cone valve 4 is arranged between the oil port P1 and the oil return port T19 of the valve body mounting seat 2, a spring I5 is arranged at the upper end of the cone valve 4, and the lower end of the cone valve 4 is pressed against the oil port P1 under the action of the spring I5; a pilot valve block 9 is connected to the upper end of the valve body mounting seat 2, a pilot valve core 8 is arranged between the pilot oil inlet A11 and the pilot oil outlet B17 of the pilot valve block 9, and the pilot valve core 8 blocks the communication between the pilot oil inlet A11 and the pilot oil outlet B17 under the action of the spring II14, and a control port K10 for controlling the movement of the pilot valve core 8 is arranged on the valve body mounting seat 2; the cone valve 4 is a hollow structure, and the oil enters the pilot oil inlet A11 through the hollow structure of the cone valve 4, and the pilot oil outlet B17 is connected to the oil return port T19. A cone valve damping hole 3 is arranged at the inlet end of the cone valve 4. The pilot valve core 8 is provided with an annular groove for facilitating the connection between the pilot oil inlet A11 and the pilot oil outlet B17. The spring Ⅰ5 is provided with a spring seat Ⅰ7 for use with it. The novel oil circuit unloading device of the utility model comprises a valve body mounting seat and a pilot valve block. A cone valve, a spring Ⅰ and a spring seat Ⅰ are sequentially installed in the valve core hole of the valve body mounting seat. The cone valve is located between the oil port P and the oil return port T of the valve body. The bottom surface of the cone valve contacts the oil port P. It fits tightly with the mounting seat under the action of spring Ⅰ. The side surface of the cone valve contacts the oil return port T. The cone valve is used to open or close the unloading oil circuit. A pilot valve core, a spring seat Ⅱ and a spring Ⅱ are provided in the core hole of the pilot valve block valve. A pilot oil inlet A connected to the valve core hole of the valve body mounting seat is provided on the pilot valve block valve, and a pilot oil outlet B connected to the oil return port T is also provided. In the initial state, the left end of the valve core contacts the pilot valve block under the action of the spring force, and the right end of the valve core contacts the blocking valve after the valve core is switched. The pilot valve core contacts each other and plays a limiting role. When the pilot valve core is displaced, the annular groove on the pilot valve core connects the pilot oil inlet A and the pilot stage oil outlet B to realize the flow of hydraulic oil. The pilot valve block is also provided with a control port K and an oil unloading port Dr. The control port K is used to provide control oil to control the displacement of the pilot valve core, and the oil unloading port Dr is always connected to the oil tank. Among them, the cone valve is a hollow structure, and a cone valve damping hole is provided at the front end of the cone valve. When in use, the hydraulic oil enters from the oil port P and passes through the cone valve to the pilot oil inlet A. When the control port K has no control oil, the hydraulic oil stops flowing. When the control port K has control oil, the hydraulic oil enters the pilot stage oil outlet B. At the same time, the oil port P and the return oil port T realize oil unloading or oil guiding.

[0027] like Figure 1 A novel oil circuit unloading device is shown, wherein the pilot valve block 9 is connected to the valve body mounting seat 2 by screws.

[0028] like Figure 1A novel oil circuit unloading device is shown, wherein a plug 16 is provided at the position where the pilot valve core 8 is installed on the pilot valve block 9, a spring seat II 12 is provided on the control pilot valve core 8, and the spring II is arranged between the plug 16 and the spring seat II 12. An O-ring II 15 is provided on the side of the plug 16 contacting the pilot valve block 9. The plug 16 is connected to the pilot valve block 9 through a thread. The O-ring II of the utility model is sleeved on the plug and installed together at the threaded hole of the pilot valve block for sealing.

[0029] like Figure 1 A novel oil circuit unloading device is shown, wherein the pilot valve block 9 is provided with O-rings I6 and III18 at the connection between the pilot oil inlet A11 and the pilot oil outlet B17 and the valve body mounting seat 2. The O-rings I and III of the utility model are between the pilot valve block and the valve body mounting seat to prevent oil leakage.

[0030] The principle of the utility model is as follows:

[0031] like Figures 2 to 3 As shown in the figure, when the control oil is blocked at port K, the pilot valve core is placed at the leftmost end of the valve core hole of the pilot valve block, and the oil circuits of the pilot oil inlet A and pilot oil outlet B are cut off by the upper step of the pilot valve core, and the oil circuit is blocked. The main system oil circuit passes through the oil port P and reaches the pilot oil inlet A after passing through the damping hole of the cone valve. Because the oil is cut off by the pilot valve core, the oil does not flow through the damping hole. At the same time, the upper cavity area of ​​the cone valve is larger than the lower cavity area. Under the action of spring I, the cone valve is always in contact with the valve body mounting seat, and the main system oil cannot be unloaded. At this time, the system is in the pressure building working position.

[0032] like Figures 4 to 5 As shown, when the control oil is passed through port K, the pilot valve core moves to the right in the valve hole, the pilot oil inlet A and the pilot oil outlet B are connected, the main system oil circuit passes through port P, reaches the pilot oil inlet A after passing through the damping hole of the cone valve, and reaches the return oil port T after passing through the pilot oil outlet B. Because there is oil flow through the damping hole, according to the hydraulic principle, when the pressure difference before and after the damping hole is greater than the force of spring I, the cone valve is opened and moves upward, and the oil port P is connected with the return oil port T. At this time, the main system oil circuit is in a unloading state.

[0033] At the same time, when the oil return port T is connected to the oil tank, the main system oil circuit is unloaded by controlling the on-off state of the control port K, and the unloading amount can be realized according to the control port pressure. When the oil return port T is connected to the bypass oil circuit, the one-button oil priming function is realized by controlling the on-off state of the control port K, and the bypass oil circuit pressure building and pressure relief mode can be realized according to the change of the control port pressure.

[0034] The new oil circuit unloading device of the utility model has a simple structure and simplifies the function of realizing unloading by solenoid valve, directly adopts hydraulic control, effectively reduces the volume of installation space, and greatly reduces the cost; it has high reliability and good maintainability, the whole valve adopts hydraulic control, and realizes the main stage opening and closing function by controlling the pilot stage reversing, which is safe and reliable; the maintenance and processing of parts only requires the removal of screws and plugs, and the maintainability is greatly enhanced, saving maintenance costs; it has strong expandability, and the unloading or oil guide function is realized by changing the connecting oil circuit of the return oil port; when the return oil port is connected to the load, the high and low changes of the load port pressure are realized by changing the change frequency of the control oil, simulating vibration and crushing functions, and it has strong expandability.

[0035] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0036] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0037] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A new type of oil circuit unloading device, characterized in that: The invention comprises a valve body mounting seat (2), a cone valve (4) is provided between an oil port P (1) and an oil return port T (19) of the valve body mounting seat (2), a spring I (5) is provided at the upper end of the cone valve (4), and the lower end of the cone valve (4) is pressed against the oil port P (1) under the action of the spring I (5); the upper end of the valve body mounting seat (2) is connected to a pilot valve block (9), and a pilot oil inlet A (11) and a pilot oil outlet B (17) of the pilot valve block (9) are provided between the pilot oil inlet A (11) and the pilot oil outlet B (17) of the pilot valve block (9). The pilot valve core (8) blocks the communication between the pilot oil inlet A (11) and the pilot oil outlet B (17) under the action of the spring II (14); the valve body mounting seat (2) is provided with a control port K (10) for controlling the movement of the pilot valve core (8); the cone valve (4) is a hollow structure, and oil enters the pilot oil inlet A (11) through the hollow structure of the cone valve (4); the pilot oil outlet B (17) is connected to the oil return port T (19).

2. A novel oil circuit unloading device as claimed in claim 1, characterized in that: A cone valve damping hole (3) is provided at the inlet end of the cone valve (4).

3. A novel oil circuit unloading device as claimed in claim 1, characterized in that: The spring I (5) is provided with a spring seat I (7) for use with it.

4. A novel oil circuit unloading device as claimed in claim 1, characterized in that: The pilot valve block (9) is connected to the valve body mounting seat (2) via screws.

5. A novel oil circuit unloading device as claimed in claim 1, characterized in that: The pilot valve core (8) is provided with an annular groove for facilitating communication between the pilot oil inlet A (11) and the pilot oil outlet B (17).

6. A novel oil circuit unloading device as claimed in claim 1, characterized in that: A plug (16) is provided at the position where the pilot valve core (8) is installed on the pilot valve block (9), a spring seat II (12) is provided on the control pilot valve core (8), and the spring II is arranged between the plug (16) and the spring seat II (12).

7. A novel oil circuit unloading device as claimed in claim 6, characterized in that: An O-ring II (15) is provided on the side of the plug (16) that contacts the pilot valve block (9).

8. A novel oil circuit unloading device as claimed in claim 6, characterized in that: The plug (16) is connected to the pilot valve block (9) via threads.

9. A novel oil circuit unloading device as claimed in claim 1, characterized in that: The pilot valve block (9) is provided with an O-ring I (6) and an O-ring III (18) at the connection between the pilot oil inlet A (11) and the pilot oil outlet B (17) and the valve body mounting seat (2), respectively.

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