A tool for oil level pipe group pressure test

Abstract

The utility model relates to a kind of test tool, especially a kind of tool for oil level pipe group pressure test.A kind of tool for oil level pipe group pressure test, including three-position four-way manual reversing valve, oil distribution block, protective sleeve;Three-position four-way manual reversing valve's O port is used to be connected with test bench oil tank, P port is used to be connected with test bench hydraulic source, A port, B port is respectively communicated with two inlet ends of oil distribution block;The outlet end of two inner cavities in oil distribution block is blocked using plug, is equipped with several threaded holes on the upper surface of cavity;Protective sleeve is communicated with oil distribution block, through hole is set in protective sleeve along length direction, measured oil level pipe is placed in through hole, one end of protective sleeve is screwed with threaded hole, the other end installs plug, measured oil level pipe is limited in protective sleeve.The utility model is simple in structure, convenient to operate, can test multiple products at a time, reduces artificial cost, time cost and test bench use cost;Test efficiency is further promoted.

Description

Technical Field

[0001] This utility model relates to a testing fixture, and more particularly to a fixture for testing the pressure resistance of a group of oil level tubes. Background Technology

[0002] Oil level tubes are crucial functional accessories for observing the oil level in aircraft. They are typically made of transparent quartz glass and are widely used in various aircraft models, including advanced trainer jets, CJ-6 trainers, and JL-8 trainers. Depending on the actual operating conditions, oil level tubes usually undergo pressure tests under specific hydraulic pressure for a certain period to assess their resistance to hydraulic damage. Traditionally, pressure tests on oil level tubes are conducted one-by-one, with each tube being tested only after the previous one has completed loading, oil flow, pressure holding, and unloading. This method fails to fully utilize the testing intervals between tubes, resulting in high labor and time costs, high worker workload and low motivation, low production efficiency, and long production cycles. Furthermore, during mass production, the repeated pressure-relief impact loads significantly increase wear and tear on the test bench components, reducing its lifespan. Utility Model Content

[0003] The purpose of this invention is to provide a tooling for group pressure testing of oil level pipes, which can meet the requirements of multiple alternating parallel testing, so as to realize the batch grouping of product pressure testing, while eliminating the testing waiting period of products to be tested one after another, and ultimately achieving the goal of improving the efficiency of product pressure testing.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a tooling for group pressure testing of oil level tubes, comprising a three-position four-way manual directional valve, an oil distribution block, and a protective sleeve; the O port of the three-position four-way manual directional valve is connected to the oil tank of the test bench, the P port is connected to the hydraulic power source of the test bench, and the A port and B port are respectively connected to the two inlet ends of the oil distribution block; the outlet ends of the two inner cavities of the oil distribution block are sealed with plugs, and several threaded holes are opened on the upper surface of the cavity; the protective sleeve is connected to the oil distribution block, and a through hole is opened in the protective sleeve along the length direction, the oil level tube to be tested is placed in the through hole, one end of the protective sleeve is screwed to the threaded hole, and the other end is fitted with a plug, thereby confining the oil level tube to be tested within the protective sleeve.

[0005] Preferably, the protective sleeve is a metal protective sleeve, used to support, fix and protect the oil level tube being measured.

[0006] Preferably, a protrusion is provided at the end of the protective sleeve that is screwed into the threaded hole. The protrusion is polygonal and is arranged around the circumference of the protective sleeve. When the protective sleeve is fully screwed into the threaded hole, the lower surface of the protrusion is in close contact with the upper surface of the oil distribution block.

[0007] Preferably, a sealing gasket is provided between the end of the protective sleeve and the bottom surface of the threaded hole; the end of the oil level tube being measured is placed on the sealing gasket.

[0008] Preferably, the protective sleeve is provided with internal threads, and the diameter of the internal thread section is larger than the diameter of the through hole; the plug is screwed to the protective sleeve, and a blind hole is provided at this end, the inner diameter of the blind hole being consistent with the outer diameter of the oil level pipe being measured.

[0009] Preferably, a sealing gasket is provided between the bottom surface of the blind hole and the end face of the oil level tube being measured, thereby sealing the port of the oil level tube being measured.

[0010] Preferably, the number of threaded holes on the upper surfaces of the two inner cavities within the oil distribution block is the same.

[0011] Working principle: The improved testing efficiency brought about by this fixture mainly comes from two aspects. On the one hand, the oil distribution block in the fixture provides multiple oil output ends, thereby realizing the effect of simultaneous loading and group testing of multiple items. On the other hand, the three-position four-way manual directional valve in the fixture switches the oil circuit to realize the alternating loading and testing of products. That is, when the directional valve is connected to the oil supply side, the product receives oil pressure and performs a normal pressure test. At the same time, when the directional valve is disconnected from the oil supply side (connects the return oil and relieves pressure), the product on the side that is connected to the oil supply side can be simultaneously removed and reloaded with a new product to be tested during the testing waiting period of the product on the side that is connected to the oil supply side. After the directional valve switches the oil circuit, the side that was previously disconnected from the oil supply side will resume the oil supply side, and the side that was previously connected to the oil supply side will be disconnected from the oil supply side. This alternation is repeated, and the testing waiting period of the previous group of products to be tested is transformed into the testing loading period of the next group of products to be tested, thus eliminating the testing waiting period.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. Simple structure and easy operation. It can test multiple products at once, which improves testing efficiency several times, reduces the frequency of repeated use of the test bench, reduces the wear and tear of test bench components, reduces labor costs, time costs and test bench usage costs, greatly shortens the product testing and delivery cycle, and significantly improves economic benefits.

[0014] 2. By switching the oil circuit through the reversing valve in the tooling, alternating loading and testing are achieved. On the one hand, the loading and testing process of the workers is seamlessly connected, and the operation is smooth and efficient, which significantly improves the operating experience. On the other hand, the testing efficiency is further improved by eliminating the non-value-adding passive waiting time between the products to be tested. Attached Figure Description

[0015] Figure 1 This is an isometric view of the oil level pipe clamping assembly according to an embodiment of this utility model;

[0016] Figure 2This is a top view of the oil level pipe clamping assembly according to an embodiment of this utility model;

[0017] Figure 3 yes Figure 2 AA section view;

[0018] Figure 4 This is a schematic diagram of the plug structure in an embodiment of this utility model;

[0019] Figure 5 This is a front view of the three-position four-way manual directional valve in an embodiment of this utility model;

[0020] Figure 6 yes Figure 5 AA section view;

[0021] Figure 7 This is a front view of the three-position four-way manual directional valve connector in an embodiment of this utility model;

[0022] Figure 8 This is a schematic diagram of the combined catheter in an embodiment of this utility model;

[0023] Figure 9 This is a front view of the oil distribution block connector in an embodiment of this utility model;

[0024] Figure 10 This is a front view of the oil distribution block in an embodiment of this utility model;

[0025] Figure 11 yes Figure 10 AA section view;

[0026] Figure 12 yes Figure 10 BB cross-sectional view;

[0027] Figure 13 This is a left view of the oil distribution block in an embodiment of this utility model;

[0028] Figure 14 yes Figure 13 CC section view;

[0029] Figure 15 This is a front view of the metal protective sleeve in an embodiment of this utility model;

[0030] Figure 16 This is a front view of the spare plug at the output port of the oil distribution block in an embodiment of this utility model;

[0031] Figure 17 This is a front view of the plug used in the product under test in this embodiment of the utility model;

[0032] Figure 18 This is a front view of the sealing gasket in an embodiment of this utility model;

[0033] Figure 19 This is a front view of the oil level pipe in an embodiment of this utility model;

[0034] Figure 1 In the diagram, 1 is a plug; 2 is a three-position four-way manual directional valve; 3 is a three-position four-way manual directional valve connector; 4 is a combined conduit; 5 is an oil distribution block connector; 6 is an oil distribution block; 7 is a metal protective sleeve; 8 is a spare plug for the oil distribution block output port; and 9 is a plug for the product under test.

[0035] Figure 3 In the diagram, 10 is a sealing gasket; 11 is a sealing pad; and 12 is an oil level pipe.

[0036] Figure 6 In the diagram, 13 is the spring; 14 is the valve core; 15 is the handle; and 16 is the housing. Detailed Implementation

[0037] It should be noted that the terms "upper" and "lower" are used to describe the situation as shown in the accompanying drawings or in the usual usage state, and those skilled in the art should understand them in accordance with the technical solution of this utility model.

[0038] The following is in conjunction with the appendix Figure 1-19 Further details of this utility model: A fixture for group pressure testing of oil level pipes includes a three-position four-way manual directional valve 2, an oil distribution block 6, and a metal protective sleeve 7; during the testing phase, the O port of the three-position four-way manual directional valve 2 is connected to the oil tank of the test bench, and the P port is used to connect to the hydraulic power source of the test bench; outside the testing phase, such as... Figure 1-3 As shown, the O and P ports of the three-position four-way manual directional valve 2 are sealed by the three-position four-way manual directional valve connector 3 and the plug 1. The A and B ports are respectively connected to the oil distribution block connectors 5 installed at the two inlet ends of the oil distribution block 6 through the three-position four-way manual directional valve connector 3 and the combined conduit 4, thereby connecting the three-position four-way manual directional valve 2 with the oil distribution block 6. The outlet ends of the two inner cavities of the oil distribution block 6 are sealed by the oil distribution block connector 5 and the plug 1. Several threaded holes are opened on the upper surface of the cavity. In this embodiment, the number of threaded holes is 12, and there are 6 on the upper surface of one cavity. The metal protective sleeve 7 is connected to the oil distribution block 6. A through hole is opened in the metal protective sleeve 7 along the length direction. The oil level tube 12 to be tested is placed in the through hole. One end of the metal protective sleeve 7 is screwed to the threaded hole, and the other end is installed with the plug 9 of the product to be tested, thereby confining the oil level tube to be tested within the metal protective sleeve 7.

[0039] In a preferred embodiment of this invention, a sealing gasket 10 is provided between the end of the metal protective sleeve 7 and the bottom surface of the threaded hole; the end of the oil level tube 12 to be tested is placed on the sealing gasket 10; a sealing gasket 11 is provided between the bottom surface of the plug 9 of the product to be tested and the end face of the oil level tube to be tested. The sealing gasket 11 is used to cooperate with the metal protective sleeve 7 to seal the oil level tube end of the product to be tested, thereby blocking the end of the oil level tube 12 to be tested.

[0040] In this embodiment, as Figure 4 As shown, the plug 1 is used to seal all joints that are open to the atmosphere when the tooling is not in use, in order to prevent foreign objects from entering the tooling.

[0041] like Figure 5-6 As shown, the three-position four-way manual directional valve 2 consists of components such as spring 13, valve core 14, handle 15, and housing 16. It is used to alternately switch the supply and return oil of the two hydraulic circuits inside the oil distribution block, allowing the relevant product being tested on the oil distribution block to receive oil, while the relevant product being loaded on the other side has its oil supply cut off, return oil connected, and pressure released. P is the oil inlet (connected to the hydraulic power source of the test bench during product testing), O is the oil return port (connected to the oil tank of the test bench during product testing), and A and B are both working ports. During testing, the handle 15 pushes and pulls the core valve 14, causing the core valve 14 and housing 16 to present different contact states, thereby switching the oil circuits and allowing A and B to alternately receive oil supply or be simultaneously cut off. When the core valve 14 is in the neutral position (i.e., Figure 6 As shown in the diagram, the P, O, B, and A oil circuits are all disconnected and not interconnected. This state represents the condition of the three-position four-way manual directional valve when the oil level tube group pressure test fixture is idle or temporarily stopped. When the handle 15 pushes the core valve 14 along the longitudinal center hole axis of the housing 16 towards the spring 13 to the stop position, the P and A oil circuits are connected, and A receives oil supply. The O and B oil circuits are connected (oil flows back to the test bench oil tank through O, and B is depressurized). When the handle 15 pulls the core valve 14 along the longitudinal center hole axis of the housing 16 towards the handle 15 to the stop position, the P and B oil circuits are connected, and B receives oil supply. The O and A oil circuits are connected (oil flows back to the test bench oil tank through O, and A is depressurized).

[0042] like Figure 10-14 As shown, the oil distribution block 6 is used to provide multiple oil output ends and divide the oil into two independent groups, creating output end conditions for the three-position four-way manual directional valve to switch oil circuits.

[0043] like Figure 16 As shown, the spare plug 8 at the output port of the oil distribution block is used to block the excess output ports of the oil distribution block when the actual number of products under test is insufficient to use all the output ports of the oil distribution block. One end of the plug has an external thread that matches the threaded hole of the oil distribution block 6.

[0044] like Figure 17 As shown, the plug 9 used in the product under test is used in conjunction with the sealing gasket to achieve a seal at the end of the oil level pipe of the product under test (see [reference]). Figure 3 Its non-threaded outer cylindrical surface is knurled to ensure sufficient frictional torque is generated when tightened.

[0045] Oil level pipe group pressure resistance test procedure:

[0046] 1. First, as Figure 1-3 As shown, the number of oil level tubes 12 to be tested determines whether all output ports of the oil distribution block 6 need to be used. When the number of oil level tubes 12 (product under test) is greater than or equal to the total number of output ports of the oil distribution block 6, proceed directly to step 2; when the number of oil level tubes 12 is less than the total number of output ports of the oil distribution block 6, remove the metal protective sleeve 7 and the plug 9 for the product under test (see...). Figure 1 ) and sealing gasket 11 (see Figure 3 And use the spare plug 8 at the output port of the oil distribution block to block the unused output port on the oil distribution block 6;

[0047] 2. For example Figure 1-3 As shown, a set of oil level pipes 12 are installed into a set of metal protective sleeves 7 on any side of the oil distribution block 6, and then the sealing gasket 11 is placed into the inner hole of the plug 9 of the product to be tested, and the plug 9 of the product to be tested and the metal protective sleeve 7 are tightened together by threads.

[0048] 3. For example Figure 1 As shown, remove the plug 1, connect the O port of the three-position four-way manual directional valve 2 to the oil tank of the test bench, and connect the P port to the hydraulic power source of the test bench.

[0049] 4. For example Figure 1 As shown, the handle 15 of the three-position four-way manual directional valve 2 is turned to switch the oil circuit, and the oil supply of the oil circuit on one side of the oil distribution block 6, which has been loaded with oil level pipe 12, is connected to supply oil at the specified pressure to start the pressure holding test. The oil supply of the other side of the oil circuit on the oil distribution block 6 is cut off (the return oil is connected to release the pressure). At the same time, another set of oil level pipe 12 is loaded according to step 2. When the loading is completed, the pressure holding time of the first set of oil level pipe 12 test ends almost simultaneously.

[0050] 5. After the previous set of oil level pipes 12 has been tested, operate the handle of the three-position four-way manual directional valve 2 to switch the oil circuit, cut off the oil supply to the previous set of oil level pipes 12 on the oil distribution block 6 (connect the return oil and relieve pressure), connect the oil supply to the next set of oil level pipes 12, supply oil at the specified pressure, and start the pressure holding test. During this period, simultaneously remove the previous set of oil level pipes 12 that have completed the test, observe the condition of the oil level pipes 12, and ensure that they are not damaged. At the same time, replace the previous set of oil level pipes 12 in the empty space created by removing the previous set of oil level pipes 12.

[0051] 6. Repeat steps 4-5 until all oil level pipes 12 have been tested.

Claims

1. A tooling for group pressure testing of oil level pipes, characterized in that: It includes a three-position four-way manual directional valve, an oil distribution block, and a protective sleeve. The O port of the three-position four-way manual directional valve is used to connect to the oil tank of the test bench, the P port is used to connect to the hydraulic power source of the test bench, and the A and B ports are respectively connected to the two inlet ends of the oil distribution block. The outlet ends of the two inner cavities of the oil distribution block are sealed with plugs, and several threaded holes are opened on the upper surface of the cavity. The protective sleeve is connected to the oil distribution block, and a through hole is opened in the length direction of the protective sleeve. The oil level tube to be measured is placed in the through hole. One end of the protective sleeve is screwed to the threaded hole, and the other end is fitted with a plug, thereby confining the oil level tube to be measured within the protective sleeve.

2. The tooling for group pressure testing of oil level pipes according to claim 1, characterized in that: The protective sleeve is a metal protective sleeve used to support, fix and protect the oil level tube being measured.

3. The tooling for group pressure testing of oil level pipes according to claim 1, characterized in that: A protrusion is provided at one end of the protective sleeve that is screwed into the threaded hole. The protrusion is polygonal and is arranged around the circumference of the protective sleeve. When the protective sleeve is fully screwed into the threaded hole, the lower surface of the protrusion is in close contact with the upper surface of the oil distribution block.

4. The tooling for group pressure testing of oil level pipes according to claim 3, characterized in that: A sealing gasket is provided between the end of the protective sleeve and the bottom surface of the threaded hole; the end of the oil level tube being measured is placed on the sealing gasket.

5. The tooling for group pressure testing of oil level pipes according to claim 1, characterized in that: The protective sleeve is provided with internal threads, and the diameter of the internal thread section is larger than the diameter of the through hole; the plug is screwed to the protective sleeve, and a blind hole is opened at this end, the inner diameter of the blind hole is consistent with the outer diameter of the oil level pipe being measured.

6. The tooling for group pressure testing of oil level pipes according to claim 5, characterized in that: A sealing gasket is placed between the bottom surface of the blind hole and the end face of the oil level tube being measured, thereby sealing the port of the oil level tube being measured.

7. The tooling for group pressure testing of oil level pipes according to claim 1, characterized in that: The number of threaded holes on the upper surfaces of the two inner cavities within the oil distribution block is the same.

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