Variable hydraulic pump pressure control valve remote external system

Abstract

The utility model belongs to hydraulic system technical field relates to a variable hydraulic pump pressure control valve remote external system. Including hydraulic pump and oil tank, the pressure control valve is provided outside the oil tank, is provided with the first valve plate on the pump body of hydraulic pump, the pressure control valve is connected with second valve plate, the first oil hole of first valve plate is linked together with the oil outlet hole of hydraulic pump, the second oil hole of second valve plate is linked together with the valve door through -hole of pressure control valve, first valve plate and second valve plate are linked together through first pipeline, the remote control valve is provided outside the tank body, and the remote control valve is linked together with second valve plate through second pipeline. The subsequent pressure control valve can be directly replaced in the outside when failure, greatly shortens the maintenance time, improves the equipment efficiency, reduces the personnel labor intensity.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic system technology and relates to a remote external system for a variable hydraulic pump pressure control valve. Background Technology

[0002] Large-scale production equipment often uses hydraulic transmission systems for its power systems. During the design phase, to achieve compact component installation and save space, while also contributing to energy efficiency and improved hydraulic pump performance, the hydraulic pump is often installed vertically within the oil tank. This efficient use of space and shortened oil suction path achieves energy savings and excellent economic benefits.

[0003] However, as the equipment ages, problems gradually emerge, causing numerous difficulties for maintenance and operation personnel. A typical problem is the difficulty in replacing the pump head pressure control valve. As the main pump head valve, the pressure control valve is responsible for system pressure increase and stabilization. Failure can lead to unstable pressure and even abnormally high oil temperature, severely affecting production. However, because the hydraulic pump is vertically installed and the pump body is entirely inside the oil tank, after a failure, the hydraulic oil in the tank must be drained, and personnel must crawl into the narrow oil tank to work, posing a significant safety risk. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and propose a remote external system for variable hydraulic pump pressure control valve.

[0005] A remote external system for a variable displacement hydraulic pump pressure control valve includes a hydraulic pump and an oil tank. A pressure control valve is installed outside the oil tank. A first valve plate is installed on the pump body of the hydraulic pump. A second valve plate is connected to the pressure control valve. A first oil inlet of the first valve plate is connected to an oil outlet of the hydraulic pump. A second oil inlet of the second valve plate is connected to a valve through-hole of the pressure control valve. The first valve plate and the second valve plate are connected through a first pipe. A remote control valve is installed outside the tank. The remote control valve is connected to the pressure control valve through a second pipe.

[0006] Furthermore, the first oil inlet includes a tapered hole, a first L-shaped channel, a second L-shaped channel, and a third L-shaped channel. The oil inlet ends of the first L-shaped channel, the second L-shaped channel, and the third L-shaped channel are stepped and are located on the first end face of the first valve plate. The oil outlet ends of the first L-shaped channel, the second L-shaped channel, and the third L-shaped channel are located on the side end face of the first valve plate.

[0007] Furthermore, the second oil inlet includes a first stepped hole, a second stepped hole, a third stepped hole, and a fourth stepped hole, the distribution positions of which correspond to the oil inlet of the remote control valve. Furthermore, both the first valve plate and the second valve plate are provided with threaded holes.

[0008] Furthermore, both the first valve plate and the second valve plate are made of steel.

[0009] Furthermore, the exterior of the oil tank is provided with a bracket for supporting the second valve plate.

[0010] Furthermore, the first pipe is a metal braided flexible hose.

[0011] Furthermore, the tensile strength of both the first valve plate and the second valve plate is ≥600MPa, the yield strength is ≥300MPa, and the safety factor is >1.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting a first valve plate and a second valve plate, the pressure control valve can be located outside the oil tank. When the pressure control valve fails, it can be replaced directly from the outside, which greatly shortens the maintenance time, improves equipment efficiency, and reduces the labor intensity of personnel.

[0013] 2. The oil outlet ends of the first L-shaped channel and the second L-shaped channel are set on the first side end face, and the oil outlet end of the third L-shaped channel is set on the second side end face to prevent interference after the oil outlet ends are connected to the first pipe. Attached Figure Description

[0014] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the first valve plate of this utility model; Figure 3 This is a schematic diagram of the second valve plate of this utility model.

[0017] Wherein: 1 is the motor; 2 is the hydraulic pump; 3 is the oil tank; 4 is the first valve plate; 5 is the first pipeline; 6 is the bracket; 7 is the pressure control valve; 8 is the second pipeline; 9 is the remote control valve; 10 is the second valve plate; 11 is the first oil delivery port; 11-1 is the conical hole; 11-2 is the first L-shaped channel; 11-3 is the second L-shaped channel; 11-4 is the third L-shaped channel; 12 is the second oil delivery port; 12-1 is the first stepped hole; 12-2 is the second stepped hole; 12-3 is the third stepped hole; 12-4 is the fourth stepped hole; 13 is the threaded hole. Detailed Implementation

[0018] Exemplary embodiments will be described in detail below. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Example

[0020] like Figure 1 As shown, a remote external system for a variable hydraulic pump pressure control valve includes a hydraulic pump 2 and an oil tank 3. A pressure control valve 7 is installed outside the oil tank 3. A first valve plate 4 is installed on the pump body of the hydraulic pump 2. The pressure control valve 7 is connected to a second valve plate 10. The first oil inlet 11 of the first valve plate 4 is connected to the oil outlet of the hydraulic pump 2. The second oil inlet 12 of the second valve plate 10 is connected to the valve through-hole of the pressure control valve 7. The first valve plate 4 and the second valve plate 10 are connected through a first pipe 5. A remote control valve 9 is installed outside the tank. The remote control valve 9 is connected to the pressure control valve 7 through a second pipe 8.

[0021] Specifically, there are two transition valve blocks in total, including a first valve plate 4 and a second valve plate 10. The first valve plate 4 is installed on the pump body, and the second valve plate 10 is connected to the pressure control valve 7 outside the oil tank 3. The first valve plate 4 is connected to the second valve plate 10 through a hose. The first pipe 5 is a rigid pipe, and the second pipe 8 is a metal braided hose.

[0022] The first valve plate 4 and the second valve plate 10 are installed on the pump body of the hydraulic pump 2 on the oil tank 3 according to the hole position requirements. The oil passage of the pump body through the first valve plate 4 is led out to the second valve plate 10 outside the oil tank through a threaded connector and a metal braided hose. A bracket 6 is welded and assembled outside the oil tank to place the second valve plate 10. One end of the second valve plate 10 is connected to the metal braided hose through a threaded connector, and the other end is directly installed to the pressure control valve 7 (DRG valve). The control port of the pressure control valve 7 (DRG valve) is connected to the remote shut-off valve 9 through the second pipe 8 (hose), thereby realizing the remote external placement and pressure control of the remote shut-off valve 9 outside the oil tank. The remote control adjustment method of the present invention allows for direct external adjustment and calibration of the system pressure. Once the pressure control valve 7 (DRG valve) is fatigued and damaged, it can be replaced immediately, greatly shortening the maintenance time, improving equipment efficiency, and reducing the labor intensity of personnel.

[0023] Furthermore, such as Figure 2 As shown, the first oil inlet 11 includes a tapered hole 11-1, a first L-shaped channel 11-2, a second L-shaped channel 11-3, and a third L-shaped channel 11-4. The oil inlet ends of the first L-shaped channel 11-2, the second L-shaped channel 11-3, and the third L-shaped channel 11-4 are stepped and are located on the first end face of the first valve plate 4. The oil outlet ends of the first L-shaped channel 11-2, the second L-shaped channel 11-3, and the third L-shaped channel 11-4 are located on the side end face of the first valve plate 4.

[0024] Specifically, the first valve plate 4 is measured and designed according to the pump port connection dimensions of the hydraulic pump 2. If the oil supply hole on the first valve plate 4 is a normal through hole, four first pipes 5 will be connected to the back of the first valve plate 4. The oil outlet end of the first pipe 5 is connected to the first pipe 5 using a threaded connector. During the connection process, the threaded connectors may interfere with each other. Therefore, the oil outlet end of the oil supply hole is set on the side end face of the first valve plate 4 to form a first L-shaped channel 11-2, a second L-shaped channel 11-3, and a third L-shaped channel 11-4. The oil outlet ends of the first L-shaped channel 11-2 and the second L-shaped channel 11-3 are set on the first side end face, and the oil outlet end of the third L-shaped channel 11-4 is set on the second side end face to prevent interference after the oil outlet end is connected to the first pipe 5.

[0025] Furthermore, such as Figure 3 As shown, the second oil inlet 12 includes a first stepped hole 12-1, a second stepped hole 12-2, a third stepped hole 12-3, and a fourth stepped hole 12-4. The distribution positions of the first stepped hole 12-1, the second stepped hole 12-2, the third stepped hole 12-3, and the fourth stepped hole 12-4 correspond to the oil inlet of the remote control valve 9.

[0026] Specifically, the stepped hole is equipped with a threaded connector. Furthermore, both the first valve plate 4 and the second valve plate 10 are provided with threaded holes 13.

[0027] Specifically, the hydraulic pump 2 is connected through threaded holes 13 on the first valve plate, and the number and position of the threaded holes 13 correspond to the connection holes of the hydraulic pump 2.

[0028] Furthermore, both the first valve plate 4 and the second valve plate 10 are made of steel.

[0029] Specifically, the first valve plate 4 and the second valve plate 10 are made of structural steel Q345B.

[0030] Furthermore, the oil tank 3 is provided with an assembly bracket 6 for supporting the second valve plate 10.

[0031] Specifically, the bracket of the second valve plate 10 is welded to the outside of the oil tank to house the first valve plate.

[0032] Furthermore, the first pipe 5 is a metal braided flexible hose.

[0033] Furthermore, the tensile strength of the first valve plate 4 and the second valve plate 10 are both ≥600MPa, the yield strength is both ≥300MPa, and the safety factor is both >1.

[0034] Specifically, the simulation analysis process is as follows: 1. The first valve plate 4 and the second valve plate 10 are made of structural steel Q345B, consistent with the material of the pressure control valve. The calculation parameters are set based on a maximum pressure of 200 bar for the pressure control valve (DRG valve). Considering that the tightening of the connecting bolts will also affect the surrounding oil holes, the bolt preload is converted into the compressive stress of the countersunk hole as another calculation condition. 2. The connecting bolts are 8.8 grade M6 internal hex bolts, with a preload F = 0.6 * δ * As, where δ is the bolt yield strength (640 MPa for grade 8.8) and As is the bolt stress cross-sectional area (approximately 20.1 mm² for M6 bolts). 2 The calculated preload is approximately 7718 N; 3. Based on the difference in cross-sectional area between the bolt's cylindrical head and the stud, it is calculated that the bolt will generate a pressure of approximately 64.35 MPa on the countersunk hole after preloading.

[0035] Simulation results: 1. Tensile strength σ of Q345B s =660MPa, yield strength σ s =345 MPa. According to the simulation results, the maximum stress concentration occurred at the main oil circuit and the bypass, which are not the locations of maximum stress in the bolt holes. The value was 98.76 MPa.

[0036] 2. Safety factor S = / =345 / 98.76=3.49>1, indicating that the structure meets the safety requirements for use.

[0037] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0038] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A remote external system for controlling the pressure of a variable hydraulic pump, characterized in that, The system includes a hydraulic pump (2) and an oil tank (3). A pressure control valve (7) is provided outside the oil tank (3). A first valve plate (4) is provided on the pump body of the hydraulic pump (2). The pressure control valve (7) is connected to a second valve plate (10). The first oil outlet (11) of the first valve plate (4) is connected to the oil outlet of the hydraulic pump (2). The second oil outlet (12) of the second valve plate (10) is connected to the valve through hole of the pressure control valve (7). The first valve plate (4) and the second valve plate (10) are connected through a first pipe (5). A remote control valve (9) is provided outside the tank. The remote control valve (9) is connected to the pressure control valve (7) through a second pipe (8).

2. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, The first oil inlet (11) includes a tapered hole (11-1), a first L-shaped channel (11-2), a second L-shaped channel (11-3), and a third L-shaped channel (11-4). The oil inlet ends of the first L-shaped channel (11-2), the second L-shaped channel (11-3), and the third L-shaped channel (11-4) are stepped. The oil inlet ends are located on the first end face of the first valve plate (4). The oil outlet ends of the first L-shaped channel (11-2), the second L-shaped channel (11-3), and the third L-shaped channel (11-4) are located on the side end face of the first valve plate (4).

3. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, The second oil inlet (12) includes a first stepped hole (12-1), a second stepped hole (12-2), a third stepped hole (12-3), and a fourth stepped hole (12-4). The distribution of the first stepped hole (12-1), the second stepped hole (12-2), the third stepped hole (12-3), and the fourth stepped hole (12-4) corresponds to the oil inlet of the remote control valve (9).

4. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, Both the first valve plate (4) and the second valve plate (10) are provided with threaded holes (13).

5. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, The first valve plate (4) and the second valve plate (10) are both made of steel.

6. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, The oil tank (3) is provided with a bracket (6) for supporting the second valve plate (10).

7. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, The first pipe (5) is a metal braided hose.

8. The remote external system for variable hydraulic pump pressure control valve according to claim 1, characterized in that, The tensile strength of both the first valve plate and the second valve plate is ≥600MPa, the yield strength is ≥300MPa, and the safety factor is >1.

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