Flow amplification valve function test tool

Abstract

A flow amplification valve function test tool comprises a steering tool and a loading tool, the steering tool comprises a torque detector, a steering wheel and a steering gear, the steering gear is connected with the input end of a flow amplification valve, and the loading tool comprises a flowmeter, a loading block, a pressure gauge and a throttling plug. And two output ends of the flow amplification valve are connected in series through a loading tool. According to the flow amplification valve function test tool, through cooperative use of the steering tool and the loading tool, the steering torque of a steering wheel on a whole vehicle and the load pressure of a steering oil cylinder can be detected and tested, and the control characteristics and steering parameters of a flow amplification valve are visually reflected; and different vehicle types can be adapted by changing the aperture size of the throttling plug and the pressure of the overflow valve, and the device has the advantages of simple structure, reasonable layout, flexible application and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly to a function test tooling for a flow amplification valve. Background Art

[0002] The steering system is directly related to the maneuverability and safety of a vehicle. Among them, the hydraulic power steering system is widely used in construction machinery and agricultural machinery. The hydraulic power steering system can precisely adjust the flow rate and pressure of hydraulic oil by controlling the steering valve group, so as to achieve precise control of the steering angle and speed, and meet the operation requirements of construction machinery.

[0003] In the steering system of large-tonnage loaders or mining machinery, a steering gear is used to receive the steering operation signals of the driver, such as the rotation angle and speed of the steering wheel. When the driver turns the steering wheel, the steering gear generates a small-flow pilot oil fluid related to the steering command according to the rotation situation. The pilot oil fluid pushes the amplification spool of the flow amplification valve to change its direction, converting the small-flow pilot oil fluid into a large-flow main oil fluid. The large-flow oil fluid enters the steering actuator (such as a steering cylinder), enabling the steering actuator to generate sufficient force to push the steering wheel of the vehicle to perform a steering action, and can precisely control the pressure and flow rate of the output working oil fluid according to the pilot oil fluid signal transmitted from the steering gear, thereby controlling the steering speed and angle.

[0004] Therefore, it is particularly important to study the performance of the flow amplification valve in the steering system. At present, there is no suitable tooling for testing the reliability and control characteristics of the flow amplification valve to fully simulate the control and functional characteristics of the flow amplification valve in the whole vehicle. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a function test tooling for a flow amplification valve with a simple structure and good effect.

[0006] The present invention is realized as follows: A function test tooling for a flow amplification valve includes a steering tooling and a loading tooling. The steering tooling includes a torque detector, a steering wheel, and a steering gear. The steering gear is connected to the input end of the flow amplification valve. The loading tooling includes a flow meter, a loading block, a pressure gauge, and a throttle plug. The two output ends of the flow amplification valve are connected in series through the loading tooling.

[0007] Further, the flow amplification valve includes a P port, an L port, an R port, a T port, a CL port, a CR port, an HP port, a PP port, and an LS port. Among them, the P port is the pressure oil port, the L port and the R port are the left steering oil port and the right steering oil port, the T port is connected to the fuel tank, the CL port and the CR port are the left steering and right steering output oil ports, the HP port is the oil inlet, the PP port is connected to the control end of the reversing valve inside the flow amplification valve, and the LS port is the load feedback oil port.

[0008] The steering gear is provided with four interfaces connected to the P port, L port, R port and T port. The loading tooling is connected to the CL port and CR port. The HP port is connected to the main pump. The hydraulic oil input through the HP port flows into the oil inlet end of the steering tooling and the PP port of the flow amplification valve after passing through the P port. The load feedback oil port of the steering gear and the LS port of the main valve are connected to the feedback port of the load sensing pump.

[0009] The model of the flow amplification valve is the XOSQA / B series steering priority type flow amplification valve.

[0010] The steering tooling further includes a tooling frame, and the torque detector, steering wheel and steering gear are arranged on the tooling frame.

[0011] The steering wheel is connected to the steering gear, and the torque detector is used to detect the rotation speed and torque of the steering wheel.

[0012] The flowmeter, loading block and throttle plug are connected in series in sequence. The pressure gauge is arranged on the loading block. The throttle plug can be adapted to different vehicle models by changing the aperture size, etc. according to different requirements.

[0013] The CL port and CR port are connected to both ends of the loading tooling.

[0014] The flowmeter is a high-precision digital collector.

[0015] The present invention has the following advantages: The flow amplification valve function test tooling of the present invention, through the combined use of the steering tooling and the loading tooling, can test and obtain the steering torque of the steering wheel on the vehicle and the load pressure of the steering cylinder, intuitively reflect the control characteristics of the flow amplification valve and the steering parameters, and can be adapted to different vehicle models by changing the aperture size of the throttle plug and the pressure of the overflow valve, and has the advantages of simple structure, precise control and good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings, as a part of the present invention, 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 to the present invention. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0017] In the drawings:

[0018] Figure 1 is a schematic structural diagram of the steering tooling of the present invention;

[0019] Figure 2 is a schematic structural diagram of the loading tooling of the present invention;

[0020] Figure 3 This is the schematic diagram of the test tooling of the present invention.

[0021] In the figure: 1. Torque detector, 2. Steering wheel, 3. Steering gear, 4. Tooling rack, 5. Flowmeter, 6. Loading block, 7. Pressure gauge, 8. Throttle plug.

[0022] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to 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 "coupling" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] As Figures 1 to 3 shown, a flow amplification valve function test tooling includes a steering tooling and a loading tooling. The steering tooling includes a torque detector 1, a steering wheel 2, and a steering gear 3. The steering gear 3 is connected to the input end of the flow amplification valve. The loading tooling includes a flowmeter 5, a loading block 6, a pressure gauge 7, and a throttle plug 8. The two output ends of the flow amplification valve are connected in series through the loading tooling. The flow amplification valve function test tooling of the present invention includes a steering tooling and a loading tooling. The steering tooling and the loading tooling are connected to the flow amplification valve to be tested through hoses. By recording the steering torque, pressure gauge, and flowmeter readings, the control characteristics of the flow amplification valve and the steering-related parameters are comprehensively judged. By simulating the steering action of the whole vehicle, the key performance indicators of the flow amplification valve are accurately measured, meeting the requirements for the reliability and function testing of the flow amplification valve.

[0027] As Figures 1 to 3 shown, a functional test tooling for a flow amplification valve. The flow amplification valve includes a P port, an L port, an R port, a T port, a CL port, a CR port, an HP port, a PP port, and an LS port. Among them, the P port is a pressure oil port, the L port and the R port are the left steering oil port and the right steering oil port respectively, the T port is connected to the fuel tank, the CL port and the CR port are the left steering and right steering output oil ports, the HP port is an oil inlet port, the PP port is connected to the control end of the reversing valve inside the flow amplification valve, and the LS port is a load feedback oil port. The steering gear 3 is provided with four interfaces connected to the P port, the L port, the R port, and the T port. The loading tooling is connected to the CL port and the CR port. The HP port is connected to the main pump. The hydraulic oil input through the HP port flows into the oil inlet end of the steering tooling and the PP port of the flow amplification valve after passing through the P port. The load feedback oil port of the steering gear and the LS port of the main valve are connected to the feedback port of the load sensing pump. The CL port and the CR port are connected to both ends of the loading tooling. In the functional test tooling for the flow amplification valve of the present invention, the HP port is connected to the main pump. The hydraulic oil enters the flow amplification valve through the HP port and is then connected to the P port of the flow amplification valve. Since the P port of the flow amplification valve is connected to the P port of the steering gear, the main pump provides hydraulic oil for the flow amplification valve and the steering gear through the HP port. At the same time, the P port of the flow amplification valve is also connected to the PP port, and control oil is provided for the hydraulic control end of the reversing valve of the flow amplification valve through the PP port. In addition, the L, R, and T ports of the flow amplification valve are connected to the L, R, and T ports of the steering gear. The CL and CR ports of the flow amplification valve are connected in series through the loading tooling. The HT and EF ports are connected to the fuel tank. When in use, when turning left, the oil output from the L port of the steering valve pushes the amplification spool of the main valve to reverse, and a large amount of hydraulic oil (i.e., the flow amplification function) is proportionally output at the CL port, and the oil returns at the CR port, thereby driving the steering cylinder to act. Similarly, when the vehicle turns the steering wheel to the right, the same applies, thus realizing the simulation of the working environment of the flow amplification valve.

[0028] As Figure 3 shown, a functional test tooling for a flow amplification valve. The model of the flow amplification valve is the XOSQA / B series steering priority type flow amplification valve.

[0029] As Figure 1A functional test tooling for a flow amplification valve as shown. The steering tooling further includes a tooling rack 4, and the torque detector 1, the steering wheel 2 and the steering gear 3 are arranged on the tooling rack 4. The steering wheel 2 is connected to the steering gear 3, and the torque detector 1 is used to detect the rotation speed of the steering wheel 2. The flowmeter 5 is a high-precision digital collector. The torque detector of the present invention is used to detect the torque and direction of the steering wheel. The steering wheel drives the steering gear to rotate and transmits the action intention to the flow amplification valve. The flow amplification valve proportionally outputs the working oil to the loading tooling under the action of the input hydraulic oil. The flowmeter is used to detect various data in the loading tooling. The result detected by the torque detector is used as the input data, and the data detected by the flowmeter is used as the output data simulating the working of the hydraulic cylinder. According to the comparison of the input data and the output data, the performance of the flow amplification valve can be judged, which is convenient and fast.

[0030] As Figure 2 A functional test tooling for a flow amplification valve as shown. The flowmeter 5, the loading block 6 and the throttle plug 8 are connected in series in sequence. The pressure gauge 7 is arranged on the loading block 6. The throttle plug 8 can be adapted to different vehicle models by replacing the aperture size, etc. according to different requirements. For the functional test tooling of the flow amplification valve of the present invention, when using the loading tooling to simulate the working pressure of the steering cylinder, if the oil flows out through the CL port, pressure loss is generated through the throttle hole in the throttle plug of the loading tooling, and then returns to the oil through the CR port. Through actual measurement, it is found that the actual load pressure of the steering cylinder of a 12-ton loader is about 10 MPa. According to the flow formula: When the main pump output flow Q = 100 L / min, a pressure difference of 10 MPa can be generated through a throttle hole with a diameter of φ4.8 mm, so as to simulate the load pressure of the steering cylinder, and the steering load pressure of different vehicle models can be simulated by adjusting the throttle hole size, which is applicable to more working conditions and can save energy and reduce costs.

[0031] For the functional test tooling of the flow amplification valve of the present invention, during use, the control characteristics of the flow amplification valve and parameters such as steering hysteresis are comprehensively judged by recording the readings of the torque tester, the pressure gauge and the flowmeter at different rotation speeds (fast rotation, slow rotation, forward and reverse installation, etc.) of the steering wheel. In addition, since the flow amplification valve has the function of steering priority, that is, it preferentially satisfies the use of the steering system under low flow of the main pump. When the main pump flow is saturated, it pushes the priority spool to change direction, and the oil flows out from the EF port and is supplied to other control valves or actuators. Therefore, an adjustable overflow valve can be added at the EF outlet to simulate the loading pressure of other actuators during compound actions.

[0032] A functional test tool for a flow amplification valve according to the present invention has a simple structure. By simulating the steering system of a whole vehicle and matching with a load-sensitive pump, the performance test of the flow amplification valve can be completed. This tool is designed to be portable and installed, and has reliable performance; it has good versatility. By measuring the steering torque of the steering wheel and the load pressure of the steering cylinder on different vehicle models, and only changing the aperture size of the throttle plug, etc., it can be applied to various models of flow amplification valves and popularized and applied to different vehicle models; it has intelligent sensing and digital acquisition. By using a high-precision digital acquisition device, it can accurately detect parameters such as oil pressure, flow rate, and temperature in real time, and can accurately judge whether the amplification factor of the flow amplification valve meets the standard.

[0033] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0034] In addition, those skilled in the art can understand that although some embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present invention and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in a combined manner according to the known technical solutions and the technical problems to be solved by this application. The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the technical solution scope of the present invention, can make some modifications or decorations with equivalent changes by using the technical content prompted above. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and decoration made to the above embodiments based on the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. A flow amplification valve function test tool, characterized by: The invention comprises a steering tool and a loading tool, wherein the steering tool comprises a torque detector (1), a steering wheel (2) and a steering gear (3), wherein the steering gear (3) is connected to an input end of a flow amplification valve, and the loading tool comprises a flow meter (5), a loading block (6), a pressure gauge (7) and a throttle plug (8), wherein two output ends of the flow amplification valve are connected in series via the loading tool.

2. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The flow amplification valve includes a P port, an L port, an R port, a T port, a CL port, a CR port, an HP port, a PP port and an LS port, wherein the P port is a pressure oil port, the L port and the R port are a left steering oil port and a right steering oil port, the T port is connected to an oil tank, the CL port and the CR port are left steering and right steering output oil ports, the HP port is an oil inlet, the PP port is connected to a control end of a reversing valve in the flow amplification valve, and the LS port is a load feedback oil port.

3. A flow amplification valve function test tool as claimed in claim 2, characterized in that: The steering gear (3) is provided with four interfaces connected to the P port, the L port, the R port and the T port, the loading fixture is connected to the CL port and the CR port, the HP port is connected to the main pump, the hydraulic oil input from the HP port flows into the oil inlet end of the steering fixture and the PP port of the flow amplification valve after passing through the P port, and the load feedback oil port of the steering gear and the LS port of the main valve are connected to the feedback port of the load sensing pump.

4. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The model of the flow amplifying valve is XOSQA / B series steering priority flow amplifying valve.

5. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The steering tool further comprises a tool frame (4), and the torque detector (1), the steering wheel (2) and the steering gear (3) are arranged on the tool frame (4).

6. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The steering wheel (2) is connected to the steering gear (3), and the torque detector (1) is used to detect the rotation speed and torque of the steering wheel (2).

7. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The flow meter (5), the loading block (6) and the throttling plug (8) are connected in series in sequence, the pressure gauge (7) is arranged on the loading block (6), and the throttling plug (8) can be adapted to different vehicle models by changing the aperture size according to different requirements.

8. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The CL port and the CR port are connected to two ends of the loading tooling.

9. A flow amplification valve function test tool as claimed in claim 1, characterized in that: The flow meter (5) is a high-precision digital collector.

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