A positive flow master pump calibration system

Abstract

The application discloses a kind of positive flow main pump calibration systems, including host hydraulic system, host control system and flow measurement module, host hydraulic system includes first main valve, second main valve, oil tank, first main pump and second main pump, the oil outlet of first main pump is connected oil tank by first main valve, the oil inlet of first main pump is connected oil tank;The oil outlet of second main pump is connected oil tank by second main valve, the oil inlet of second main pump is connected oil tank, first main pump oil outlet, second main pump oil outlet is also respectively connected flow measurement module, flow measurement module is used to measure the output flow of first main pump, second main pump, host control system controls the current of first main pump, second main pump respectively, acquires output flow signal in flow measurement module and controls the on-off of bypass cut-off valve of first main valve, second main valve.

Description

Technical Field

[0001] This invention relates to a positive flow main pump calibration system, belonging to the field of hydraulic control technology. Background Technology

[0002] Positive flow hydraulic systems for excavators are widely used. In conventional excavation and loading applications, the requirements for flow accuracy are not high, and the current-displacement parameters used for flow control are theoretical values. However, when higher precision motion control is required, the current-displacement relationship varies significantly due to differences in the batch and manufacturer of the main pump, making it difficult for theoretical parameters to meet the requirements.

[0003] To overcome the above problems, some manufacturers calibrate by measuring flow rate, but this requires multiple disassembly and reassembly of pipelines, which is a complicated process and wastes hydraulic oil. When the market needs to replace the main pump or its components, there is no way to recalibrate, and market service cannot be completed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a positive flow main pump calibration system, which solves the problems of complex calibration processes and difficulties in subsequent market application in existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A positive flow main pump calibration system includes a main hydraulic system and a flow measurement module;

[0007] The main hydraulic system includes a first main valve, a second main valve, an oil tank, a first main pump, and a second main pump. The oil outlet of the first main pump is connected to the oil tank through the first main valve, and the oil inlet of the first main pump is also connected to the oil tank. The oil outlet of the second main pump is connected to the oil tank through the second main valve, and the oil inlet of the second main pump is also connected to the oil tank.

[0008] The oil outlets of the first and second main pumps are also connected to flow measurement modules, which are used to measure the output flow of the first and second main pumps.

[0009] Furthermore, the aforementioned includes a host control system, which includes a controller. The controller is provided with a first main pump current control port I1, a second main pump current control port I2, a flow measurement port Q, a first bypass shut-off valve control port C1, and a second bypass shut-off valve control port C2. The first main pump current control port I1 and the second main pump current control port I2 control the current of the first main pump and the second main pump, respectively. The flow measurement port Q is used to collect the output flow signal in the flow measurement module. The first bypass shut-off valve control port C1 and the second bypass shut-off valve control port C2 control the opening and closing of the first main valve and the second main valve, respectively.

[0010] Furthermore, the aforementioned first main valve includes a first bypass shut-off valve, which is a two-position two-way valve. The a1 port of the first bypass shut-off valve is connected to the oil outlet of the first main pump, the b1 port of the first bypass shut-off valve is connected to the oil tank, and the control terminal of the first bypass shut-off valve is connected to the control port C1 of the first bypass shut-off valve.

[0011] Furthermore, the aforementioned second main valve includes a second bypass shut-off valve, which is a two-position two-way valve. The a2 port of the second bypass shut-off valve is connected to the oil outlet of the second main pump, the b2 port of the second bypass shut-off valve is connected to the oil tank, and the control terminal of the second bypass shut-off valve is connected to the control port C2 of the second bypass shut-off valve.

[0012] Furthermore, the aforementioned flow measurement module includes check valve L1A, check valve L1B, check valve L2A, and check valve L2B.

[0013] The inlet of check valve L1A is connected to the outlet of check valve L1B and the outlet of the first main pump. The inlet of check valve L1B is connected to the inlet of check valve L2B. The outlet of check valve L2B is connected to the inlet of check valve L2A and the outlet of the second main pump. The outlet of check valve L2A is connected to the outlet of check valve L1A.

[0014] Furthermore, the aforementioned flow measurement module also includes a flow meter, the two ends of which are connected to the oil outlet of check valve L1A and the oil inlet of check valve L1B, respectively.

[0015] The beneficial effects achieved by this invention are as follows:

[0016] 1. This invention achieves rapid connection with the host hydraulic system and host control system by designing a hydraulic circuit in the measurement module, without requiring modification of the original hydraulic system pipeline or the addition of a new hydraulic system during measurement;

[0017] 2. For dual-pump systems, existing calibration methods are all discontinuous and sequential. This invention, through control logic design, can quickly achieve individual and continuous calibration of dual pumps. Attached Figure Description

[0018] Figure 1 This is a system configuration diagram of the present invention.

[0019] The meanings of the reference numerals in the figure are as follows: 1-Main hydraulic system; 2-Main control system; 3-Flow measurement module; 11-First main valve; 111-First bypass shut-off valve; 12-Second main valve; 121-Second bypass shut-off valve; 13-Oil tank; 14-First main pump; 15-Second main pump; 21-Controller; 31-Flow meter. Detailed Implementation

[0020] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0021] This embodiment discloses a positive flow main pump calibration system, such as Figure 1 As shown, it includes a main hydraulic system 1, a main control system 2, and a flow measurement module 3.

[0022] The main hydraulic system 1 includes a first main valve 11, a second main valve 12, an oil tank 13, a first main pump 14, and a second main pump 15. The first main valve 11 includes a first bypass shut-off valve 111, and the second main valve 12 includes a second bypass shut-off valve 121. The oil outlet of the first main pump 14 is connected to port a1 of the first bypass shut-off valve 111, and the oil inlet of the first main pump 14 is connected to the oil tank 13. The oil outlet of the second main pump 15 is connected to port a2 of the second bypass shut-off valve 121, and the oil inlet of the second main pump 15 is connected to the oil tank 13. The oil inlet of the second bypass shut-off valve 121 is connected to the oil tank 13. The oil inlet of the second main pump 15 is connected to the oil tank 13. The oil inlet of the second bypass shut-off valve 121 is connected to the oil tank 13.

[0023] The flow measurement module 3 includes check valves L1A, L1B, L2A, and L2B, and a flow meter 31. The inlet of check valve L1A is connected to both the outlet of check valve L1B and the outlet of the first main pump 14. The inlet of check valve L1B is connected to the inlet of check valve L2B. The outlet of check valve L2B is connected to both the inlet of check valve L2A and the outlet of the second main pump 15. The outlet of check valve L2A is connected to the outlet of check valve L1A. The two ends of the flow meter 31 are connected to the outlet of check valve L1A and the inlet of check valve L1B, respectively.

[0024] The main control system 2 includes a controller 21, which has a first main pump current control port I1, a second main pump current control port I2, a flow measurement port Q, a first bypass shut-off valve control port C1, and a second bypass shut-off valve control port C2. The first main pump current control port I1 and the second main pump current control port I2 control the current of the first main pump 14 and the second main pump 15, respectively. The flow measurement port Q is used to collect the output flow signal of the flow meter 31. The first bypass shut-off valve control port C1 and the second bypass shut-off valve control port C2 control the opening and closing of the first bypass shut-off valve 111 and the second bypass shut-off valve 121, respectively.

[0025] During calibration, the main hydraulic system 1, the main control system 2, and the flow measurement module 3 are connected.

[0026] The calibration is divided into the calibration of the first main pump 14 and the calibration of the second main pump 15. When calibrating the first main pump 14, the following operations are performed: the control port C1 of the first bypass shut-off valve controls the blocking of ports a1 and b1 of the first bypass shut-off valve 111, and the control port C2 of the second bypass shut-off valve controls the connection of ports a2 and b2 of the second bypass shut-off valve 121. At this time, the flow of the first main pump 14 flows back to the oil tank through the check valve L1A, the flow meter 31, the check valve L2B, and ports a2 and b2 of the second bypass shut-off valve 121. The flow rate collected by the flow meter is the actual flow rate of the first main pump 14. The current control port I1 of the first main pump controls the current of the first main pump 14 to be loaded. Based on the control current data of the first main pump 14 and the data collected by the flow meter, the current-displacement parameters of the first main pump 14 are obtained.

[0027] During the calibration of the second main pump 15, the following operations are performed: the first bypass shut-off valve control port C1 controls the connection of ports a1 and b1 of the first bypass shut-off valve 111, and the second bypass shut-off valve control port C2 controls the disconnection of ports a2 and b2 of the second bypass shut-off valve 121. At this time, the flow of the second main pump 15 flows back to the oil tank through check valve L2A, flow meter 31, check valve L1B, and ports a1 and b1 of the first bypass shut-off valve 111. The flow rate collected by the flow meter is the actual flow rate of the second main pump 15. The second main pump current control port I2 controls the current of the second main pump 15 to be loaded. Based on the control current data of the second main pump 15 and the data collected by the flow meter, the current-displacement parameters of the second main pump 15 are obtained.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A positive flow main pump calibration system, characterized in that, Includes the main hydraulic system (1) and the flow measurement module (3); The main hydraulic system (1) includes a first main valve (11), a second main valve (12), an oil tank (13), a first main pump (14), and a second main pump (15). The oil outlet of the first main pump (14) is connected to the oil tank (13) through the first main valve (11), and the oil inlet of the first main pump (14) is connected to the oil tank (13). The oil outlet of the second main pump (15) is connected to the oil tank (13) through the second main valve (12), and the oil inlet of the second main pump (15) is connected to the oil tank (13). The oil outlet of the first main pump (14) and the oil outlet of the second main pump (15) are also connected to the flow measurement module (3), which is used to measure the output flow of the first main pump (14) and the second main pump (15); It also includes a host control system (2), which includes a controller (21). The controller (21) is provided with a first main pump current control port I1, a second main pump current control port I2, a flow measurement port Q, a first bypass shut-off valve control port C1, and a second bypass shut-off valve control port C2. The first main pump current control port I1 and the second main pump current control port I2 control the current of the first main pump (14) and the second main pump (15) respectively. The flow measurement port Q is used to collect the output flow signal in the flow measurement module (3). The first bypass shut-off valve control port C1 and the second bypass shut-off valve control port C2 control the opening and closing of the first main valve (11) and the second main valve (12) respectively. The flow measurement module (3) includes check valves L1A, L1B, L2A, and L2B. The inlet of check valve L1A is simultaneously connected to the outlet of check valve L1B and the outlet of the first main pump (14). The inlet of check valve L1B is connected to the inlet of check valve L2B. The outlet of check valve L2B is simultaneously connected to the inlet of check valve L2A and the outlet of the second main pump (15). The outlet of check valve L2A is connected to the outlet of check valve L1A. The flow measurement module (3) also includes a flow meter (31), the two ends of which are connected to the oil outlet of the one-way valve L1A and the oil inlet of the one-way valve L1B, respectively.

2. The positive flow main pump calibration system according to claim 1, characterized in that, The first main valve (11) includes a first bypass shut-off valve (111), which is a two-position two-way valve. The a1 port of the first bypass shut-off valve (111) is connected to the oil outlet of the first main pump (14), the b1 port of the first bypass shut-off valve (111) is connected to the oil tank (13), and the control end of the first bypass shut-off valve (111) is connected to the control port C1 of the first bypass shut-off valve.

3. The positive flow main pump calibration system according to claim 1, characterized in that, The second main valve (12) includes a second bypass shut-off valve (121), which is a two-position two-way valve. The a2 port of the second bypass shut-off valve (121) is connected to the oil outlet of the second main pump (15), the b2 port of the second bypass shut-off valve (121) is connected to the oil tank (13), and the control end of the second bypass shut-off valve (121) is connected to the control port C2 of the second bypass shut-off valve.

Images