Double-stop-valve control structure

Abstract

The utility model discloses a double-stop-valve control structure which is characterized in that a stop valve block is arranged on a rear cover of an axial plunger closed type pump, an A-port working oil way stop valve is arranged in the stop valve block, and a B-port working oil way stop valve is arranged in the rear cover; oil drainage of the A-port working oil way stop valve and oil drainage of the B-port working oil way stop valve share one oil drainage channel, A-port working oil enters the A-port oil way stop valve through an A-port channel arranged in the rear cover, and B-port working oil enters the A-port oil way stop valve through a B-port channel arranged in the rear cover. Different cut-off pressures can be set for the working oil port A and the working oil port B of the hydraulic axial plunger closed type pump according to needs, and the hydraulic axial plunger closed type pump can cope with more complex working conditions. The oil port A and the oil port B can be independently adjusted more conveniently, meanwhile, the structure of the stop valve sleeve is optimized, the length is shortened, parts such as a shuttle valve and an ejector pin are omitted, cost is reduced, and convenience is created for manufacturing of the stop valve sleeve.

Description

Technical Field

[0001] This utility model relates to hydraulic axial piston closed-type pump shut-off valve technology, and in particular to a dual shut-off valve control structure. Background Technology

[0002] Hydraulic axial piston closed-circuit pumps have two working ports, A and B. The function of the shut-off valve is to set the maximum pressure for both working ports A and B. If the pressure exceeds the set pressure, the shut-off valve activates, and the hydraulic axial piston closed-circuit pump stops output flow to protect the system. Existing hydraulic axial piston closed-circuit pumps all use a single shut-off valve design, which can only set the same shut-off pressure for both working ports A and B, and cannot meet the needs of operating conditions where different shut-off pressures are required for ports A and B. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems and provide a dual shut-off valve control structure. Based on the existing technology, while adding a shut-off valve block and a shut-off valve, the oil passage of the hydraulic axial piston closed pump is redesigned so that different shut-off pressures can be set at the A and B working oil ports of the hydraulic axial piston closed pump.

[0004] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: a dual shut-off valve control structure, including an axial piston closed pump with two working oil ports A and B, characterized in that: a shut-off valve block is provided on the rear cover of the axial piston closed pump, the shut-off valve block is provided with a working oil circuit shut-off valve at port A, and a working oil circuit shut-off valve at port B is provided in the rear cover; wherein the oil drain of the working oil circuit shut-off valve at port A and the oil drain of the working oil circuit shut-off valve at port B share a common oil drain channel, and the working oil at port A enters the working oil circuit shut-off valve at port A through the oil port A channel provided in the rear cover, and the working oil at port B enters the working oil circuit shut-off valve at port A through the oil port B channel provided in the rear cover.

[0005] In the aforementioned dual shut-off valve control structure, preferably, the shut-off valve block is connected to the rear cover by a number of cylindrical head hexagonal screws.

[0006] In the aforementioned dual shut-off valve control structure, preferably, the A-port working oil circuit shut-off valve and the B-port working oil circuit shut-off valve share a common control oil.

[0007] This technical solution addresses the problems of existing hydraulic axial piston closed-loop pumps with a single shut-off valve, where the A and B working ports can only be set with the same shut-off pressure, and are only applicable to working conditions where the A and B working ports are the same. It fully utilizes the existing pump structure by redesigning the valve body and internal oil passages, adding a shut-off valve block and a shut-off valve, and making the drain passages of the A-port working oil circuit shut-off valve and the B-port working oil circuit shut-off valve share a single drain passage and a single control oil stream. This simple and ingenious structure allows for different shut-off pressure settings for the A and B working ports, thus meeting complex working conditions.

[0008] Based on this, components such as shuttle valves in the existing single shut-off valve form are eliminated, while the length of the shut-off valve sleeve is shortened, simplifying the process and saving costs.

[0009] Compared with the prior art, the beneficial effects of this utility model are: by adding a shut-off valve block and a shut-off valve, the two working oil ports A and B of the hydraulic axial piston closed pump can be set with different shut-off pressures as needed, which can cope with more complex working conditions and has greater versatility in practical applications; it is more convenient to adjust the A and B oil ports separately, and at the same time, the shut-off valve sleeve structure is optimized, the length is shortened, and parts such as shuttle valves and ejector pins are eliminated, reducing costs and creating convenience for the manufacturing of the shut-off valve sleeve. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a double shut-off valve arrangement structure according to the present invention.

[0011] Figure 2 This is a schematic diagram of the present invention.

[0012] Figure 3 This is a schematic diagram of a single shut-off valve in the existing technology.

[0013] In the diagram: 1-Shut-off valve block, 2-A port working oil circuit shut-off valve, 3-B port working oil circuit shut-off valve, 4-Rear cover, 5-Cylindrical head internal hex screw, 6-Drain channel, 7-B port channel, 8-A port channel; 9-Shuttle valve. Detailed Implementation

[0014] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0015] like Figure 1 As shown, this embodiment presents a dual shut-off valve control structure based on an axial piston closed-loop pump. It has two working oil ports, A and B. A shut-off valve block 1 is installed on the rear cover 4 of the axial piston closed-loop pump. The shut-off valve block 1 is fixedly connected to the rear cover 4 by a set of cylindrical head hexagonal screws 5.

[0016] The shut-off valve block 1 is equipped with an A-port working oil circuit shut-off valve 2, and the rear cover 4 is equipped with a B-port working oil circuit shut-off valve 3. The oil drain channels of the A-port working oil circuit shut-off valve 2 and the B-port working oil circuit shut-off valve 3 share a single oil drain channel 6. Working oil from port A enters the A-port oil circuit shut-off valve 2 through the A-port channel 8 in the rear cover 4, and working oil from port B enters the A-port oil circuit shut-off valve 3 through the B-port channel 7 in the rear cover 4. The A-port working oil circuit shut-off valve 2 and the B-port working oil circuit shut-off valve 3 share a single control oil source. (See [reference needed]). Figure 2 .

[0017] Working principle: When the pressure of the working oil at port A is too high and exceeds the set pressure of the working oil circuit shut-off valve 2 at port A, the control oil in the oil circuit flows back to the oil tank through the oil drain channel 6 of the working oil circuit shut-off valve 2 at ports A and B in the rear cover 4. At this time, the system pressure will no longer rise and will stabilize at the set pressure of the working oil circuit shut-off valve 2 at port A. The flow rate of the working oil at port A is zero, thus playing a safety protection role for the system.

[0018] The significance of setting different pressures for the shut-off valves of the working oil circuits at ports A and B is that when the working oil at port A requires a higher load, while the working oil at port B requires a lower load for safety protection, it is necessary to set the shut-off pressures of the shut-off valves of the working oil circuits at ports A and B respectively.

[0019] The above embodiments are illustrative of the present invention and not intended to limit it. Although the present invention has been described in conjunction with preferred embodiments, it should be understood that the present invention is not limited to the preferred embodiments. Those skilled in the art can make various equivalent modifications and substitutions to the technical solutions of the present invention based on its teachings. Therefore, the scope of the present invention should be defined by the claims, and all such equivalent modifications and substitutions fall within the protection scope of the present invention.

Claims

1. A dual shut-off valve control structure, comprising an axial piston closed-loop pump with two working oil ports, A and B, characterized in that: A shut-off valve block (1) is provided on the rear cover (4) of the axial piston closed pump. The shut-off valve block is provided with a working oil circuit shut-off valve (2) at port A and a working oil circuit shut-off valve (3) at port B in the rear cover. The oil drain of the working oil circuit shut-off valve at port A and the oil drain of the working oil circuit shut-off valve at port B share a drain channel (6). The working oil at port A enters the working oil circuit shut-off valve (2) at port A through the oil port channel (8) in the rear cover, and the working oil at port B enters the working oil circuit shut-off valve (2) at port A through the oil port channel (7) in the rear cover.

2. The dual shut-off valve control structure according to claim 1, characterized in that, The shut-off valve block (1) is connected to the rear cover (4) by a number of cylindrical head hexagonal screws (5).

3. The dual shut-off valve control structure according to claim 1, characterized in that, The A-port working oil circuit shut-off valve (2) and the B-port working oil circuit shut-off valve (3) share the same control oil.

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