Test tool

Abstract

A reversing oil way comprises a main oil inlet pipe and a working oil pipe, one end of the main oil inlet pipe is communicated with an oil tank, the other end of the main oil inlet pipe is communicated with a reversing oil cylinder through a reversing valve, and a piston rod of the reversing oil cylinder is used for pushing a reversing spring under the action of hydraulic oil to enable a tested valve body to reverse. The piston rod is also used for resetting under the elastic action of the reversing spring; the testing oil path comprises a testing oil inlet pipe and a testing oil return pipe, one end of the testing oil inlet pipe is communicated with the oil tank, the other end is communicated with an oil inlet of the tested valve body, one end of the testing oil return pipe is communicated with the oil tank, and the other end is communicated with an oil outlet of the tested valve body; the reversing generator is used for outputting reversing signals to the reversing valve, so that the main oil inlet pipe supplies oil to the working oil pipe through the reversing valve, or the working oil pipe returns oil to the oil tank through the reversing valve. According to the testing tool, the reversing test of the tested valve body can be realized without manual operation, the safe service life of the tested valve body can be conveniently evaluated, and the testing tool is simple in structure and convenient to maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve body testing, and in particular relates to a testing tool. Background Art

[0002] Manually operated valves are one of the components currently used in most mechanical equipment, including excavators, cranes, loaders, bulldozers, pump trucks and other engineering machinery. However, wear and fatigue may occur during use, and the valve body needs to be continuously tested for reversing. After how long or how many times the valve body is used, the internal parts will be severely worn and fatigued, resulting in loss of valve performance. However, it is unrealistic to achieve continuous reversing of the valve body by manpower.

[0003] For manual control valves, manual testing is not very realistic. Without testing, the service life of the manual control valve cannot be guaranteed, the actual conditions of the parts that use special processes inside cannot be understood, the safe service life of the equipment cannot be assessed more accurately, and a safety warning cannot be given to later equipment users. Utility Model Content

[0004] The main purpose of the utility model is to provide a test fixture, aiming to solve the technical problem that the safe service life of a manual control valve and special process verification cannot be evaluated in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a test fixture for a tested valve body with a reversing spring, the test fixture comprising: an oil tank; a reversing oil circuit, comprising a main oil inlet pipe and a working oil pipe, one end of the main oil inlet pipe is connected to the oil tank, and the other end is connected to the reversing oil cylinder through a reversing valve, the piston rod of the reversing oil cylinder is used to push the reversing spring under the action of hydraulic oil, so that the tested valve body is reversed, and the piston rod is also used to reset under the elastic force of the reversing spring; a test oil circuit, comprising a test oil inlet pipe and a test oil return pipe, one end of the test oil inlet pipe is connected to the oil tank, and the other end is used to connect to the oil inlet of the tested valve body, one end of the test oil return pipe is connected to the oil tank, and the other end is used to connect to the oil outlet of the tested valve body; a reversing generator is used to output a reversing signal to the reversing valve, so that the main oil inlet pipe supplies oil to the working oil pipe through the reversing valve, or the working oil pipe returns oil to the oil tank through the reversing valve.

[0006] In an embodiment of the utility model, a first oil pump is also provided on the main oil inlet pipe, which is located on the pipeline between the reversing valve and the oil tank and is used to pump oil to the reversing valve. A second oil pump is provided on the test oil inlet pipe, which is used to pump oil to the oil inlet of the valve body under test.

[0007] In an embodiment of the utility model, the test tool also includes a first pressure regulating pipe, a first pressure regulating port is arranged between the reversing valve and the first oil pump, one end of the first pressure regulating pipe is connected to the first pressure regulating port, and the other end is connected to the oil tank, and a first overflow valve is arranged on the first pressure regulating pipe.

[0008] In an embodiment of the utility model, the test tool also includes a second pressure regulating pipe, a second pressure regulating port is arranged on the pipeline between the second oil pump and the oil inlet of the valve body under test, one end of the second pressure regulating pipe is connected to the second pressure regulating port, and the other end is connected to the oil tank, and a second overflow valve is arranged on the second pressure regulating pipe.

[0009] In an embodiment of the utility model, filters are provided on the pipelines between the first oil pump, the second oil pump and the oil tank.

[0010] In an embodiment of the utility model, there are multiple reversing springs, the number of the reversing oil cylinders is consistent with the number of the reversing springs and are arranged in one-to-one correspondence, and the multiple piston rods are connected by a connecting piece.

[0011] In an embodiment of the utility model, the reversing oil circuit also includes multiple cylinder branches connected to the working oil pipe, the oil ports of the multiple cylinder branches are converged in the working oil pipe, and the cylinder branches and the reversing cylinders are consistent in number and connected one-to-one.

[0012] In an embodiment of the utility model, a stroke detector for detecting the stroke of the piston rod is arranged on the piston rod.

[0013] In an embodiment of the utility model, the travel detector is a displacement sensor.

[0014] In an embodiment of the utility model, the commutation generator is one of a frequency generator or a signal generator; and / or, the commutation generator is connected to a counter, and the counter is used to count the electrical signal output by the commutation generator.

[0015] Through the above technical solution, the test tool provided by the embodiment of the utility model has the following beneficial effects:

[0016] When the test fixture is used for the valve body under test with a reversing spring, a reversing signal of a certain frequency can be automatically output to the reversing valve through the reversing generator, so that the reversing valve is connected to the main oil inlet pipe and the working oil pipe, or the working oil pipe is connected to the oil tank and returns oil to the oil tank. When the main oil inlet pipe is connected to the working oil pipe, the working oil pipe supplies hydraulic oil to the reversing cylinder. The reversing cylinder can squeeze the reversing spring under the drive of the hydraulic oil to make the valve body under test to reverse. When the working oil pipe returns oil to the oil tank, the reversing spring can push the piston rod through its own elastic force to reset the piston rod, and the valve body under test can reverse autonomously under the action of its own elastic force. The test fixture adopts the technical means of cooperating the reversing oil circuit, the test oil circuit and the reversing generator, and does not need to use other driving sources such as air sources, and can output power stably. In addition, the reversing cylinder is not easy to rub in the test fixture, has a long service life, and has a low maintenance cost. In addition, the reversing oil circuit and the test oil circuit share the same oil tank, and the equipment requirements are small. The test tool in the utility model can realize the reversing test of the tested valve body without manual operation, can conveniently evaluate the safe service life of the tested valve body, and has a simple structure and is easy to maintain.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of oil circuit connection of a test tool according to an embodiment of the utility model.

[0020] Description of Reference Numerals

[0021] Label Name Label Name

[0022] 100 Test fixture 29 Cylinder branch

[0023] 1 Fuel tank 3 Test oil circuit

[0024] 2 Reversing oil circuit 31 Test oil inlet pipe

[0025] 21 Main oil inlet pipe 32 Test oil return pipe

[0026] 22 Working oil pipe 33 Second oil pump

[0027] 23 Reversing oil return pipe 34 Second pressure regulating pipe

[0028] 24 Directional valve 35 Second relief valve

[0029] 25 Reversing cylinder 4 Reversing generator

[0030] 26 First oil pump 5 filter

[0031] 27 First pressure regulating pipe 200 Tested valve body

[0032] 28 First relief valve 210 Reversing spring DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] The test tool according to the present utility model is described below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, in the embodiment of the utility model, the test fixture 100 is used for the tested valve body 200 with the reversing spring 210, and the test fixture 100 includes an oil tank 1, a reversing oil circuit 2, a test oil circuit 3 and a reversing generator 4; the reversing oil circuit 2 includes a main oil inlet pipe 21 and a working oil pipe 22, one end of the main oil inlet pipe 21 is connected to the oil tank 1, and the other end is connected to the reversing oil cylinder 25 through the reversing valve 24, and the piston rod of the reversing oil cylinder 25 is used to push the reversing spring 210 under the action of hydraulic oil to make the tested valve body 200 reverse, and the piston rod is also used to It is reset under the elastic force of the reversing spring 210; the test oil circuit 3 includes a test oil inlet pipe 31 and a test oil return pipe 32, one end of the test oil inlet pipe 31 is connected to the oil tank 1, and the other end is used to connect to the oil inlet of the tested valve body 200, one end of the test oil return pipe 32 is connected to the oil tank 1, and the other end is used to connect to the oil outlet of the tested valve body 200; the reversing generator 4 is used to output a reversing signal to the reversing valve 24, so that the main oil inlet pipe 21 supplies oil to the working oil pipe 22 through the reversing valve 24, or the working oil pipe 22 returns oil to the oil tank 1 through the reversing valve 24.

[0036] It can be understood that the test fixture 100 in this embodiment is mainly used for durability testing of manual control valves and verification of feasibility of special processes. The valve body 200 under test can be a manual control valve with a reversing spring 210. The reversing valve 24 can be an electromagnetic reversing valve 24 or a hydraulic reversing valve 24. The reversing generator 4 can send a reversing signal to the reversing valve 24 at a specified frequency. In the figure, the P port of the valve body 200 under test is the oil inlet, and the T port is the oil outlet. In one embodiment, the reversing generator 4 gives a certain frequency, discontinuous electrical signal to the A-position coil of the electromagnetic reversing valve 24, so as to realize rapid power-off and power-on of the electromagnetic reversing valve 24, that is, the power is off in the A-position, the reversing valve 24 is connected to the working oil pipe 22 and the reversing return oil pipe 23, the working oil pipe 22 is depressurized, the piston rod of the reversing cylinder 25 is pushed to the left by the reversing spring 210 in the tested valve body 200, and the tested valve body 200 completes a reversal; the power is on in the A-position, the reversing valve 24 is connected to the main oil inlet pipe 21 and the working oil pipe 22, the working oil pipe 22 is connected to the pressure oil, the piston rod of the reversing cylinder 25 is pushed to the right by the pressure oil, and the tested valve body 200 completes a reversal.

[0037] When the test fixture 100 in this embodiment is used for the tested valve body 200 with the reversing spring 210, a reversing signal of a certain frequency can be automatically output to the reversing valve 24 through the reversing generator 4, so that the reversing valve 24 is connected to the main oil inlet pipe 21 and the working oil pipe 22, or the working oil pipe 22 is connected to the oil tank 1 and returns oil to the oil tank 1. When the main oil inlet pipe 21 is connected to the working oil pipe 22, the working oil pipe 22 supplies hydraulic oil to the reversing cylinder 25. The reversing cylinder 25 can squeeze the reversing spring 210 under the drive of the hydraulic oil to reverse the tested valve body 200. When the working oil pipe 22 returns oil to the oil tank 1, the reversing spring 210 can push the piston rod through its own elastic force to reset the piston rod, and the tested valve body 200 can reverse autonomously under the action of its own elastic force. The test fixture 100 adopts the technical means of cooperating the reversing oil circuit 2, the test oil circuit 3 and the reversing generator 4, and does not need to use other driving sources such as air sources, and can output power stably. In addition, the reversing oil cylinder 25 is not prone to friction in the test fixture 100, has a long service life, and has low maintenance costs. The reversing oil circuit 2 and the test oil circuit 3 share the same oil tank 1, and the equipment requirements are small. The test fixture 100 in this embodiment can realize the reversing test of the tested valve body 200 without manual operation, and can effectively evaluate the safe service life of the tested valve body 200. It has a simple structure and is easy to maintain. In addition, when the internal parts of the tested valve body 200 are subjected to special process treatment, the test fixture 100 repeatedly reverses the tested valve body 200, and the feasibility of the special process can be effectively verified by observing whether the surface of the internal parts of the tested valve body 200 will fall off quickly.

[0038] In addition, by using the reversing spring 210 of the tested valve body 200 itself to reset the piston rod, it is possible to avoid using other reset drive structures, thereby simplifying the tooling structure of the test tooling 100 .

[0039] In one embodiment, the main oil inlet pipe 21 is further provided with a first oil pump 26, which is located on the pipeline between the reversing valve 24 and the oil tank 1 and is used to pump oil to the reversing valve 24. The test oil inlet pipe 31 is provided with a second oil pump 33, which is used to pump oil to the oil inlet of the valve body 200 to be tested. In this embodiment, the main oil inlet pipe 21 and the test oil inlet pipe 31 are pumped with oil by the first oil pump 26 and the second oil pump 33 respectively, which can improve the oil pumping efficiency. In another embodiment, the main oil inlet pipe 21 and the test oil inlet pipe 31 share the same oil pump. The test components of the test fixture 100 can be further reduced.

[0040] It should be noted that the test fixture 100 further includes a first pressure regulating pipe 27, a first pressure regulating port is provided between the reversing valve 24 and the first oil pump 26, one end of the first pressure regulating pipe 27 is connected to the first pressure regulating port, and the other end is connected to the oil tank 1, and a first overflow valve 28 is provided on the first pressure regulating pipe 27. In this embodiment, the reversing oil circuit 2 provides clean pressure oil filtered by the filter 5 through the first oil pump 26, and the first overflow valve 28 can ensure that the oil pressure in the reversing oil circuit 2 is constant, showing a safety protection function.

[0041] In one embodiment, the test fixture 100 further includes a second pressure regulating pipe 34, a second pressure regulating port is provided on the pipeline between the second oil pump 33 and the oil inlet of the tested valve body 200, one end of the second pressure regulating pipe 34 is connected to the second pressure regulating port, and the other end is connected to the oil tank 1, and a second overflow valve 35 is provided on the second pressure regulating pipe 34. The test oil circuit 3 in this embodiment provides clean pressure oil filtered by the filter 5 through the second oil pump 33, and the second overflow valve 35 ensures that the oil pressure in the test oil circuit 3 is constant and protects the oil circuit.

[0042] Specifically, filters 5 are provided on the pipelines between the first oil pump 26, the second oil pump 33 and the oil tank 1. The filter 5 can be a filter screen.

[0043] like Figure 1 As shown, there are multiple reversing springs 210, the number of reversing oil cylinders 25 is consistent with the number of reversing springs 210 and is arranged one-to-one, and multiple piston rods are connected by a connecting piece. In the figure, there are three reversing springs 210, and there are also three reversing oil cylinders 25. The three piston rods are connected in series in sequence through a connecting cross bar, and synchronous reversing can be achieved during reversing.

[0044] In one embodiment, the reversing oil circuit 2 further includes a plurality of cylinder branches 29 connected to the working oil pipe 22, the oil ports of the plurality of cylinder branches 29 are gathered in the working oil pipe 22, and the cylinder branches 29 and the reversing oil cylinders 25 are of the same number and are connected one-to-one. In this embodiment, the working oil pipe 22 supplies oil to the reversing oil cylinder 25 through three cylinder branches 29 at the same time, and can supply oil to multiple reversing oil cylinders 25 at the same time through the working oil pipe 22, and the structure is simple and easy to connect.

[0045] It can be understood that a stroke detector for detecting the stroke of the piston rod is provided on the piston rod. In this embodiment, the stroke detector can be connected to a counter, and the reciprocating motion of the piston rod can be counted through the stroke detection of the stroke detector, which can effectively grasp the number of switching times of the valve body 200 under test, and facilitate the subsequent evaluation of the safe service life of the valve body 200 under test. In the embodiment of the utility model, the stroke detector is a displacement sensor, and in other embodiments, the stroke detector can be a distance sensor or a photoelectric sensor.

[0046] Specifically, the reversing generator 4 is one of a frequency generator or a signal generator; the use of a frequency generator or a signal generator can make the test frequency adjustable, and by setting a certain frequency, the electromagnetic reversing valve 24 can be continuously and quickly reversed, thereby causing the valve body 200 to be quickly reversed. In addition, the reversing generator 4 in this embodiment is connected to a counter, and the counter is used to count the electrical signal output by the reversing generator 4. In another embodiment, the reversing generator 4 has its own electrical signal counting, and the displacement sensor is connected to the counter to record the actual reversal of the piston rod. The counter in this embodiment counts both the electrical signal and the reciprocating motion of the piston rod, which can count the number of reciprocating motions of the piston rod and compare the number of output electrical signals, so as to determine whether the piston rod is working normally.

[0047] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A test fixture, used for a tested valve body (200) with a reversing spring (210), characterized in that: The testing tool (100) comprises: Fuel tank (1); The reversing oil circuit (2) comprises a main oil inlet pipe (21) and a working oil pipe (22); one end of the main oil inlet pipe (21) is connected to the oil tank (1), and the other end is connected to the reversing oil cylinder (25) through a reversing valve (24); the piston rod of the reversing oil cylinder (25) is used to push the reversing spring (210) under the action of hydraulic oil to make the tested valve body (200) reverse; the piston rod is also used to reset under the elastic force of the reversing spring (210); A test oil circuit (3), comprising a test oil inlet pipe (31) and a test oil return pipe (32), wherein one end of the test oil inlet pipe (31) is connected to the oil tank (1), and the other end is used to connect to the oil inlet of the tested valve body (200); one end of the test oil return pipe (32) is connected to the oil tank (1), and the other end is used to connect to the oil outlet of the tested valve body (200); The reversing generator (4) is used to output a reversing signal to the reversing valve (24), so that the main oil inlet pipe (21) supplies oil to the working oil pipe (22) through the reversing valve (24), or so that the working oil pipe (22) returns oil to the oil tank (1) through the reversing valve (24).

2. The test tool according to claim 1, characterized in that: The main oil inlet pipe (21) is also provided with a first oil pump (26), which is located on the pipeline between the reversing valve (24) and the oil tank (1) and is used to pump oil to the reversing valve (24). The test oil inlet pipe (31) is provided with a second oil pump (33), which is used to pump oil to the oil inlet of the tested valve body (200).

3. The test tool according to claim 2, characterized in that: The test fixture (100) further comprises a first pressure regulating pipe (27), a first pressure regulating port is provided between the reversing valve (24) and the first oil pump (26), one end of the first pressure regulating pipe (27) is connected to the first pressure regulating port, and the other end is connected to the oil tank (1), and a first overflow valve (28) is provided on the first pressure regulating pipe (27).

4. The test tool according to claim 2, characterized in that: The test fixture (100) further comprises a second pressure regulating pipe (34), a second pressure regulating port being arranged on the pipeline between the second oil pump (33) and the oil inlet of the tested valve body (200), one end of the second pressure regulating pipe (34) being connected to the second pressure regulating port, and the other end being connected to the oil tank (1), and a second overflow valve (35) being arranged on the second pressure regulating pipe (34).

5. The test tool according to claim 2, characterized in that: Filters (5) are provided on the pipelines between the first oil pump (26), the second oil pump (33) and the oil tank (1).

6. The test tool according to any one of claims 1 to 5, characterized in that: The number of the reversing springs (210) is multiple, the number of the reversing oil cylinders (25) is consistent with the number of the reversing springs (210) and is arranged in a one-to-one correspondence, and the multiple piston rods are connected by a connecting piece.

7. The test fixture according to claim 6, characterized in that: The reversing oil circuit (2) further comprises a plurality of cylinder branches (29) in communication with the working oil pipe (22), the oil ports of the plurality of cylinder branches (29) being gathered in the working oil pipe (22), the cylinder branches (29) being identical in number to the reversing oil cylinders (25) and being connected one-to-one.

8. The test tool according to any one of claims 1 to 5, characterized in that: The piston rod is provided with a stroke detector for detecting the stroke of the piston rod.

9. The test fixture according to claim 8, characterized in that: The stroke detector is a displacement sensor.

10. The test tool according to any one of claims 1 to 5, characterized in that: The commutation generator (4) is one of a frequency generator or a signal generator; and / or, The commutation generator (4) is connected to a counter, and the counter is used to count the electrical signal output by the commutation generator (4).

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