Balancing valve set durability test system

Abstract

The present application relates to the quality control of hydraulic components, in particular to a testing system for balance valve groups. The balance valve group durability testing system comprises a forward testing system circuit and a reverse testing system circuit, the balance valve group to be tested is connected in the testing system, the forward testing system circuit and the reverse testing system circuit share a hydraulic pump, the hydraulic pump pumps hydraulic oil in an oil tank to the forward testing system circuit or the reverse testing system circuit through a three-position four-way electromagnetic reversing valve controlled by a programmable controller, the three-position four-way electromagnetic reversing valve has a Y-shaped neutral position, and the three-position four-way electromagnetic reversing valve reciprocally switches between the left position, the neutral position and the right position under the control of the programmable controller, so that the forward testing and the reverse testing are reciprocally switched. The present application not only provides a balance valve durability testing technology, but also realizes the durability testing of balance valve groups.

Description

Technical Field

[0001] This invention relates to quality control of hydraulic components, and more particularly to a testing system for balance valve assemblies. Background Technology

[0002] With the rapid development of China's construction machinery industry, the demand for domestically produced hydraulic components has surged, while users are placing increasingly higher demands on the reliability and durability of these components. For safety and smooth control, balance valves or valve assemblies are typically installed in mechanisms involving load descent; for example, in construction cranes, truck-mounted cranes' luffing and telescopic mechanisms, rotary drilling rigs' boom luffing and mast luffing mechanisms, and concrete pump trucks' boom luffing mechanisms. To ensure the operational performance of these mechanisms, especially under load descent conditions, and to prevent operational accidents caused by shaking, creeping, or speed issues, balance valves or valve assemblies are installed at the hydraulic actuators of each mechanism to achieve fine-motion and smooth control of the descent. Therefore, the safety and reliability of hydraulic balance valves or valve assemblies directly affect the safety and reliability of the boom and the entire machine; they are one of the most critical components in a hydraulic system. Therefore, it is necessary to conduct durability tests on balance valves or valve assemblies before shipment to identify defects and verify their reliability.

[0003] Currently, hydraulic circuits used for durability testing of hydraulic balance valves employ dual-pump hydraulic systems. These systems rely on manual operation of directional valves to achieve the required number of reversals, as shown in Figure 3 of JB / T 9739.1—2000 Balance Valves for Truck Cranes and Tire Cranes. However, with increasing safety awareness, customers are demanding durability tests of up to 1 million cycles. The high number of reversals required by these tests necessitates significant manual labor costs and makes it difficult to ensure continuous operation, impacting test accuracy. Furthermore, dual-pump systems inevitably lead to a doubling of testing costs, time, and energy loss.

[0004] Definitions:

[0005] Balanced valve assembly: An integrated valve assembly consisting of a balance valve, a relief valve, and a check valve all mounted on the same valve block. Summary of the Invention

[0006] This invention aims to overcome the aforementioned deficiencies of the prior art and provide a durability testing system for balance valve assemblies. This invention not only provides durability testing technology for balance valves but also enables durability testing of balance valve assemblies.

[0007] This invention is implemented as follows: a durability testing system for a balance valve assembly includes a forward testing system loop and a reverse testing system loop. The balance valve assembly under test is connected to the testing system. The forward testing supply loop and the reverse testing system loop share a hydraulic pump. This hydraulic pump pumps hydraulic oil from the oil tank to either the forward or reverse testing system loop via a three-position four-way solenoid directional valve controlled by a programmable controller. The three-position four-way solenoid directional valve has a Y-type neutral position function. Under the control of the programmable controller, the three-position four-way solenoid directional valve reciprocates between the left, neutral, and right positions, realizing the reciprocating switching between forward and reverse testing.

[0008] The aforementioned balance valve assembly durability testing system, specifically the forward test circuit, includes the oil tank and hydraulic pump, a P-port pressure gauge, an overflow valve, a one-way pressure reducing valve, a load-port pressure gauge, a three-position four-way solenoid directional valve, and the balance valve assembly under test. The three-position four-way solenoid directional valve is a Y-type valve, with port A connected to the V-port of the valve under test, port B connected to the PLI port of the valve under test, and port P connected to the hydraulic pump outlet. Under the control of the programmable controller, the three-position four-way solenoid directional valve reciprocates between the left, middle, and right positions, realizing the reciprocating switching between forward and reverse testing.

[0009] The aforementioned balance valve assembly durability testing system includes a programmable controller connected to electromagnets on both sides of a three-position four-way solenoid valve, which controls the three-position four-way solenoid valve to reciprocate at a set frequency and synchronously records the number of test cycles.

[0010] The aforementioned balance valve assembly durability testing system includes a one-way pressure reducing valve whose inlet is connected to a hydraulic pump and whose outlet is connected to port C of the balance valve under test. When the hydraulic pump pressurizes port V of the balance valve under test, the one-way pressure reducing valve simultaneously provides pressure to port C to simulate the load under operating conditions. The oil tank is connected to port T of the balance valve under test to realize oil return from the balance valve under test. The pressure gauge at port P is connected to the outlet of the hydraulic pump to display the test pressure of the balance valve under test. The pressure gauge at the load port is connected to port C of the balance valve under test to display the simulated load pressure.

[0011] The aforementioned balance valve assembly durability testing system includes a reverse test circuit comprising, in addition to the oil tank, hydraulic pump, P-port pressure gauge, one-way pressure reducing valve, three-position four-way solenoid directional valve, and the balance valve under test, all sharing the forward test circuit, a pilot port pressure gauge and an adjustable flow valve. The three-position four-way solenoid directional valve is a Y-type valve, with port A connected to port V of the valve under test, port B connected to port PLI of the valve under test, port P connected to the hydraulic pump outlet, and port T connected to the adjustable flow valve inlet. Under the control of the programmable controller, the three-position four-way solenoid directional valve reciprocates between the left, middle, and right positions, enabling switching between forward and reverse testing.

[0012] The aforementioned balance valve assembly durability testing system includes a programmable controller connected to electromagnets on both sides of a three-position four-way solenoid valve, which controls the three-position four-way solenoid valve to repeatedly switch directions at a set frequency, and synchronously records the number of test cycles.

[0013] The aforementioned balance valve assembly durability testing system has an adjustable flow valve inlet connected to the T port of a three-position four-way solenoid directional valve, and an outlet connected to an oil tank. The adjustable flow valve is adjusted to establish test pressure in the circuit. The pilot pressure gauge is connected to the PLI port of the balance valve assembly under test to display the test pressure of the reverse test circuit.

[0014] Compared to traditional methods, this invention employs a single-pump system to simultaneously perform durability testing on three major components within the balancing valve assembly: the check valve, the relief valve, and the balancing valve. The test conditions simulate actual operating conditions, the structure is simple, the functionality is powerful, and it saves on testing equipment costs. Through a programmable logic controller (PLC), the testing process is automated, improving testing efficiency, halving the testing time, and ensuring consistency throughout the testing process, resulting in highly reliable test results. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0017] These accompanying drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0018] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "left," "middle," and "right" generally refer to the upper, lower, left, middle, and right positions as shown in the accompanying drawings.

[0019] This invention relates to a hydraulic system for durability testing of a balance valve or balance valve assembly, comprising a forward test system circuit and a reverse test system circuit.

[0020] For details, see attached. Figure 1As shown, the forward test system circuit includes an oil tank 1, a hydraulic pump 2, a P-port pressure gauge 3, a one-way pressure reducing valve 4, a load port pressure gauge 5, a three-position four-way solenoid directional valve 8, and a tested balance valve assembly 10. The hydraulic pump supplies pressurized oil to this test circuit, and the pressurized oil is simultaneously supplied to the three-position four-way solenoid directional valve 8 and the one-way pressure reducing valve 4. At this time, the P-port pressure gauge 3 displays the test pressure. After the pressure reducing valve 4 reduces pressure, the high-pressure oil is supplied to the tested balance valve 9, acting on the one-way valve outlet 102 inside the tested balance valve assembly 10 to simulate the load pressure. At this time, the load port pressure gauge 5 displays the simulated load pressure. The programmable logic controller (PLC) 7 controls the three-position four-way solenoid directional valve 8 to switch to the right position and simultaneously records the number of switching operations. High-pressure oil flows through port A of the three-position four-way solenoid directional valve 8 to port V of the tested balance valve assembly 10, opening the check valve 102 and reaching the inlet of the relief valve 101 inside the tested balance valve assembly 10. At this time, the high-pressure oil from the outlet of the hydraulic pump 2 acts on the lower end of the balance valve 103 inside the tested balance valve assembly 10, while the outlet pressure of the one-way pressure reducing valve 4 acts on its upper end. When the output pressure of the hydraulic pump 2 is greater than the set pressure of the relief valve 101, the relief valve 101 opens, and the pressurized oil returns to the oil tank 1 through port T of the tested balance valve assembly 10. The forward test system loop simultaneously tests the durability of 10-the tested balance valve assembly's internal 101-relief valve and 102-check valve, as well as the pressure resistance of the balance valve 103.

[0021] Specifically, the reverse test system loop is shown in the attached figure. Figure 1 As shown, the test circuit includes an oil tank 1, a hydraulic pump 2, a P-port pressure gauge 3, a one-way pressure reducing valve 4, a load port pressure gauge 5, an adjustable flow valve 6, a three-position four-way solenoid directional valve 8, and a tested balance valve assembly 10. The hydraulic pump 2 supplies pressurized oil to this test circuit, which is simultaneously supplied to the three-position four-way solenoid directional valve 8 and the one-way pressure reducing valve 4. At this time, the P-port pressure gauge 3 displays the test pressure. After the pressure is reduced by the one-way pressure reducing valve 4, the high-pressure oil is supplied to the C port of the tested balance valve 9, acting on the upper end of the balance valve 103 inside the tested balance valve assembly 10 to simulate the load pressure. At this time, the load port pressure gauge 5 displays the simulated load pressure. The programmable logic controller (PLC) 7 controls the three-position four-way solenoid directional valve 8 to switch to the left position and simultaneously records the number of switching operations. High-pressure oil flows through port A of the three-position four-way solenoid directional valve 8 to port PLI of the tested balance valve assembly 10. The high-pressure oil pushes the valve core of the balance valve 103 to the left, opening the balance valve 103. High-pressure oil from port C of the tested balance valve assembly 10 flows through the balance valve 103 to port V of the tested balance valve assembly 10, enters port A of the three-position four-way solenoid directional valve 8, and flows out from port T of the three-position four-way solenoid directional valve 8 to the adjustable flow valve 6, and then returns to the oil tank 1. By adjusting the adjustable flow valve 6, the test pressure of the balance valve 103 can be set. The reverse test system loop tests the durability of the balance valve 103 inside the tested balance valve assembly 10.

[0022] In the above specific embodiments, the hydraulic power component can be any hydraulic pump or accumulator, used to deliver pressurized oil to the drive unit of the tested balance valve group. The programmable controller 7 controls the three-position four-way solenoid directional valve 8 to switch according to the set frequency, and records the number of switching simultaneously. Through the forward test circuit and the reverse test circuit, the durability test function of the overflow valve 101, check valve 102 and balance valve 103 of the balance valve group is realized.

Claims

1. A durability testing system for a balance valve assembly, comprising a forward test system circuit and a reverse test system circuit, wherein the balance valve assembly under test is connected to the test system, characterized in that, The forward and reverse test system loops share a hydraulic pump and a three-position four-way solenoid valve controlled by a programmable logic controller (PLC). The hydraulic pump delivers hydraulic oil from the tank to either the forward or reverse test system loop via the three-position four-way solenoid valve. The three-position four-way solenoid valve has port A connected to port V of the valve under test, port B connected to port PLI of the valve under test, port P connected to the hydraulic pump outlet, and port T connected to the inlet of the adjustable flow valve. The neutral position of this three-position four-way solenoid valve is Y-type. Under the control of the PLC, the three-position four-way solenoid valve reciprocates between the left, neutral, and right positions, realizing the switching between forward and reverse testing. The forward test system circuit includes the oil tank and hydraulic pump, a P-port pressure gauge, an overflow valve, a one-way pressure reducing valve, a load port pressure gauge, a three-position four-way solenoid directional valve, and a tested balance valve group. The inlet of the one-way pressure reducing valve is connected to the hydraulic pump, and the outlet is connected to the C-port of the tested balance valve group. When the hydraulic pump pressurizes the V-port of the tested balance valve group, the one-way pressure reducing valve synchronously provides pressure to the C-port to simulate the load under working conditions. The oil tank is connected to the T-port of the tested balance valve to realize the return oil of the tested balance valve. The P-port pressure gauge is connected to the outlet of the hydraulic pump to display the test pressure of the tested balance valve. The load port pressure gauge is connected to the C-port of the tested balance valve group to display the load simulation pressure. The reverse test system loop includes, in addition to the oil tank, hydraulic pump, P-port pressure gauge, one-way pressure reducing valve, three-position four-way solenoid directional valve, and the tested balance valve group shared with the forward test system loop, a pilot port pressure gauge and an adjustable flow valve. The inlet of the adjustable flow valve is connected to the T-port of the three-position four-way solenoid directional valve, and the outlet of the T-port is connected to the oil tank. The test pressure is established in the loop by adjusting the adjustable flow valve. The pilot port pressure gauge is connected to the PLI port of the tested balance valve group to display the test pressure of the reverse test loop.

2. The durability testing system for a balance valve assembly according to claim 1, characterized in that, The programmable controller is connected to the electromagnets on both sides of the three-position four-way solenoid valve, controlling the three-position four-way solenoid valve to reciprocate at a set frequency, and synchronously recording the number of test cycles.

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