High pressure water pump high frequency and static pressure test servo system

Abstract

This utility model relates to a high-frequency and static pressure testing servo system for a high-pressure water pump, including a servo actuator, a high-pressure water pump, and a servo hydraulic station. The servo actuator includes a cylinder and a piston rod. A displacement sensor and a low-pressure sensor are installed on the cylinder. The cylinder has two oil ports, which are connected to the servo hydraulic station via two oil circuits, namely a first oil circuit and a second oil circuit. A high-flow servo valve, a high-pressure filter, a check valve, and an oil pump are installed sequentially on the first oil circuit. The second oil circuit is connected to the same high-flow servo valve and then to the servo hydraulic station. A control branch is also provided on the second oil circuit, with its two sides connected to the two sides of the high-flow servo valve. A low-flow servo valve is also installed on the control branch. An energy storage branch is also connected to the first oil circuit. The control of the oil is achieved by using the cooperation of two parallel high-flow servo valves and a low-flow servo valve, which can achieve both individual and simultaneous control.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical testing, and in particular to a high-pressure water pump high-frequency and static pressure testing servo system. Background Technology

[0002] High-pressure water pump high-frequency and static pressure testing is mainly used to test the delayed stress of soil and rock and high-frequency impact testing. Previously, this type of testing was mainly carried out by pressurizing with high-pressure water pumps. The high-pressure pulse pressure was low and the frequency was not high. The pressure of high-pressure water pumps was also often limited, which restricted the progress of many deep-sea soil and rock development and testing. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-frequency and static pressure testing servo system for high-pressure water pumps that is flexible in control and has a fast frequency response.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-frequency and static pressure testing servo system for high-pressure water pumps, the innovation of which is: including a servo actuator, a high-pressure water pump and a servo hydraulic station;

[0005] The servo actuator includes a cylinder and a piston rod placed inside the cylinder. A displacement sensor and a low pressure sensor are installed on the cylinder. One side of the cylinder is connected to a high-pressure water pump, and the servo actuator and the high-pressure water pump share a piston rod. The cylinder also has two oil ports, and the two oil ports are connected to the servo hydraulic station through two oil circuits, which are defined as the first oil circuit and the second oil circuit.

[0006] A high-flow servo valve, a high-pressure filter, a check valve, and an oil pump are sequentially installed on the first oil line. An electric motor is also connected to one side of the oil pump via a coupling.

[0007] The second oil circuit is connected to the same high-flow servo valve and then to the servo hydraulic station. A control branch is also provided on the second oil circuit. The two sides of the control branch are respectively connected to the two sides of the high-flow servo valve. A low-flow servo valve is also installed on the control branch.

[0008] A storage branch is also connected to the first oil line. A high-voltage accumulator is installed on one side of the storage branch, and the other side is connected to the first oil line, the small flow servo valve and then back to the first oil line.

[0009] The high-pressure water pump is equipped with a high-pressure ball valve, a high-pressure check valve, and a high-pressure sensor.

[0010] Furthermore, the cooperation between the cylinder, piston rod, and high-pressure water pump is as follows: one side of the piston rod extends out of the cylinder and into the high-pressure water pump; a first piston is installed on the outer wall of the section of the piston rod placed inside the cylinder; and a second piston is installed at the end of the piston rod that extends into the high-pressure water pump.

[0011] Furthermore, an overflow branch is provided between the first oil circuit and the second oil circuit, and an overflow valve is installed on the overflow branch.

[0012] The advantages of this utility model are as follows: The servo system in this utility model uses two parallel-designed high-flow servo valves and low-flow servo valves to control the oil. The high-flow servo valve works at high frequency, and the low-flow servo valve works at static pressure. It can achieve both individual control and simultaneous control, and the switching is more flexible and convenient for different working conditions.

[0013] By integrating the servo actuator and the high-pressure water pump into one unit, and sharing a single piston rod, this design makes the output shaft of the servo actuator the drain plunger of the high-pressure water pump, resulting in a compact structure and high mechanical efficiency.

[0014] The high-frequency response advantage of servo valves and servo actuators makes it easy to implement and control the operation of high-pressure water pumps.

[0015] The servo system of this invention has the advantages of energy saving, fast response, high frequency, smooth operation, large boost ratio, small size, and the ability to achieve automatic control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-frequency and static pressure testing servo system for high-pressure water pumps according to this utility model. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] like Figure 1 The high-frequency and static pressure testing servo system for a high-pressure water pump shown includes a servo actuator, a high-pressure water pump 2, and a servo hydraulic station 3.

[0019] The servo actuator includes a cylinder 1 and a piston rod 15 placed inside the cylinder 1. A displacement sensor 15 and a low pressure sensor 13 are installed on the cylinder 1. One side of the cylinder 1 is connected to a high-pressure water pump 2, and the servo actuator and the high-pressure water pump 2 share a piston rod 15.

[0020] The connection between the cylinder 1, piston rod 15 and high-pressure water pump 2 is as follows: one side of piston rod 15 extends out of cylinder 1 and into high-pressure water pump 2; a first piston 12 is installed on the outer wall of the section of piston rod 15 placed inside cylinder 1; and a second piston 21 is installed at the end of piston rod 1 that extends into high-pressure water pump 2.

[0021] The cylinder body 1 also has two oil ports, and the two oil ports are connected to the servo hydraulic station 3 through two oil circuits respectively. The two oil circuits are defined as the first oil circuit 16 and the second oil circuit 17.

[0022] A high-flow servo valve 10, a high-pressure filter 7, a check valve 6, and an oil pump 4 are sequentially installed on the first oil circuit 16. An electric motor 5 is also connected to one side of the oil pump 4 via a coupling.

[0023] The second oil circuit 17 is connected to the same high-flow servo valve 10 and then to the servo hydraulic station 3. A control branch 20 is also provided on the second oil circuit 17. The two sides of the control branch 20 are respectively connected to the two sides of the high-flow servo valve 10. A low-flow servo valve 11 is also installed on the control branch 20. The high-flow servo valve 10 and the low-flow servo valve 11 are both connected to the same PLC controller and are controlled by the PLC controller to perform opening and closing actions or adjust the opening size. The PLC controller is installed in the electrical cabinet.

[0024] A storage branch 19 is also connected to the first oil circuit 16. A high-voltage accumulator 9 is installed on one side of the storage branch 19. The other side of the storage branch 19 is connected to the first oil circuit 16 and the small flow servo valve 11 in sequence, and then back to the first oil circuit 16. The two connection points of the storage branch 19 and the first oil circuit 16 are located on both sides of the large flow servo valve 10.

[0025] An overflow branch 18 is provided between the first oil circuit 16 and the second oil circuit 17. An overflow valve 8 is installed on the overflow branch 18. The connection point between the overflow branch 18 and the first oil circuit 16 is located between the high-flow servo valve 10 and the high-pressure filter 7. The connection point between the overflow branch 18 and the second oil circuit 17 is located between the high-flow servo valve 10 and the servo hydraulic station 3.

[0026] A high-pressure ball valve 23, a high-pressure check valve 24, and a high-pressure sensor 22 are installed on the high-pressure water pump 2.

[0027] During operation, the motor 5 and the oil pump 4 are connected by a coupling, and the output is through the check valve 6 and the high-pressure filter 7. The outlet of the oil pump 4 is connected to the overflow valve 8 and the accumulator 9. The high-flow servo valve 10 and the low-flow servo valve 11 are connected in parallel. Both the high-flow servo valve 10 and the low-flow servo valve 11 can supply oil to the servo actuator. The servo actuator is equipped with a displacement sensor 14 and a low-pressure sensor 13. The extended end of the piston rod 15 of the servo actuator is connected to the second plunger 21 of the high-pressure water pump 2. The high-pressure water pump 2 is equipped with a high-pressure ball valve 23 for the output water port, a high-pressure sensor 22 for detecting the high pressure of the high-pressure water pump 2, and a check valve 24 for water replenishment.

[0028] The servo system of this utility model uses hydraulic oil as the working medium, integrating the servo actuator and the high-pressure water pump 2 into one unit. The output shaft of the servo actuator is the drainage shaft of the high-pressure water pump 2. The displacement and high-frequency vibration of the piston rod of the servo actuator are the drainage volume and speed of the high-pressure water pump 2. The servo hydraulic station 3 supplies hydraulic oil to the high-flow servo valve 10 and the low-flow servo valve 11. The action of the servo actuator is controlled by the high-flow servo valve 10 or the low-flow servo valve 11, thereby controlling the discharge output of the high-pressure water pump 2.

[0029] The servo actuator is equipped with a displacement sensor 14 and a low-pressure sensor 13, and can form a pressure or position closed loop with the high-flow servo valve 10 and the low-flow servo valve 11.

[0030] The PLC controller is used to automatically switch between high-frequency and low-frequency, static pressure and pressurization functions for either the high-flow servo valve 10 or the low-flow servo valve 11.

[0031] The servo actuator increases the pressure of the high-pressure water pump 2 to 200MPa through pressurization, with a pressurization ratio of 8:1. The PLC controller controls the high-flow servo valve 10 or the low-flow servo valve 11 to carry out various working condition tests, and the switching is convenient.

[0032] The servo system of this invention can achieve integrated control with high control precision and high frequency. It can perform high-voltage and high-frequency tests and has the advantages of energy saving, fast response, high frequency, stable operation, large boost ratio, small size and automatic control. It has been applied in the field of time-delay mechanics testing of soil and rock.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-frequency and static pressure testing servo system for high-pressure water pumps, characterized in that: Includes servo actuators, high-pressure water pumps, and servo hydraulic power units; The servo actuator includes a cylinder and a piston rod placed inside the cylinder. A displacement sensor and a low pressure sensor are installed on the cylinder. One side of the cylinder is connected to a high-pressure water pump, and the servo actuator and the high-pressure water pump share a piston rod. The cylinder also has two oil ports, and the two oil ports are connected to the servo hydraulic station through two oil circuits, which are defined as the first oil circuit and the second oil circuit. A high-flow servo valve, a high-pressure filter, a check valve, and an oil pump are sequentially installed on the first oil line. An electric motor is also connected to one side of the oil pump via a coupling. The second oil circuit is connected to the same high-flow servo valve and then to the servo hydraulic station. A control branch is also provided on the second oil circuit. The two sides of the control branch are respectively connected to the two sides of the high-flow servo valve. A low-flow servo valve is also installed on the control branch. A storage branch is also connected to the first oil line. A high-voltage accumulator is installed on one side of the storage branch, and the other side is connected to the first oil line, the small flow servo valve and then back to the first oil line. The high-pressure water pump is equipped with a high-pressure ball valve, a high-pressure check valve, and a high-pressure sensor.

2. The high-pressure water pump high-frequency and static pressure testing servo system according to claim 1, characterized in that: The cylinder, piston rod, and high-pressure water pump are configured such that one side of the piston rod extends out of the cylinder and into the high-pressure water pump, a first piston is installed on the outer wall of the section of the piston rod inside the cylinder, and a second piston is installed at the end of the piston rod that extends into the high-pressure water pump.

3. The high-pressure water pump high-frequency and static pressure testing servo system according to claim 1, characterized in that: An overflow branch is provided between the first oil circuit and the second oil circuit, and an overflow valve is installed on the overflow branch.

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