Segmented pressurizing structure for hydraulic strength test

Abstract

The utility model discloses a segmented pressurizing structure for a hydraulic strength test, and belongs to the technical field of hydraulic strength tests. The structure comprises a driving mechanism, a segmented pressurization mechanism, a liquid medium supplementing mechanism and a test piece, one end of the segmented pressurization mechanism is connected with the driving mechanism, the other end of the segmented pressurization mechanism is connected with the bottom of the liquid medium supplementing mechanism through a liquid supplementing pipe, and a pressure detection assembly A is arranged at the position, close to the segmented pressurization mechanism, of the liquid supplementing pipe. A valve D is arranged at the position close to the liquid medium supplementing mechanism, the test piece is connected with the liquid supplementing pipe through the liquid injection pipe, the connecting point of the liquid injection pipe and the liquid supplementing pipe is located between the pressure detection assembly A and the valve D, the liquid injection pipe is provided with a valve A and a pressure detection assembly B, and the pressure detection assembly B is located between the valve A and the test piece. For a test piece, the device can meet the requirement of a very high test pressure condition, and has the advantages of low test cost, high test efficiency and the like.

Description

Technical Field

[0001] This utility model relates to a segmented pressurization structure for hydraulic strength testing, belonging to the field of hydraulic strength testing technology. Background Technology

[0002] Hydraulic components and castings used in aerospace applications require certain strength and rigidity. Before assembling them into aerospace equipment, they must undergo hydraulic strength tests to verify whether their strength and rigidity meet the requirements.

[0003] For traditional hydraulic strength testing equipment, the test pressure inside the test specimen cavity mainly depends on the pressure source of the hydraulic pump in the equipment, and the outlet pressure of the hydraulic pump is mainly determined by its displacement and efficiency. When the test specimen requires a high test pressure, the outlet pressure of the original hydraulic pump itself cannot meet the test requirements, and it is necessary to replace it with a hydraulic pump with a larger displacement and higher efficiency. This increases the test cost, and replacing the hydraulic pump is time-consuming and also leads to a decrease in test efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a segmented pressurization structure for hydraulic strength testing.

[0005] This utility model is achieved through the following technical solution:

[0006] A segmented pressurization structure for hydraulic strength testing includes a drive mechanism, a segmented pressurization mechanism, a liquid medium replenishment mechanism, and a test piece. One end of the segmented pressurization mechanism is connected to the drive mechanism, and the other end is connected to the bottom of the liquid medium replenishment mechanism via a replenishment pipe. A pressure detection component A is provided on the replenishment pipe near the segmented pressurization mechanism, and a valve D is provided near the liquid medium replenishment mechanism. The test piece is connected to the replenishment pipe via an injection pipe, and the connection point between the injection pipe and the replenishment pipe is located between the pressure detection component A and the valve D. The injection pipe is provided with valve A and a pressure detection component B, and the pressure detection component B is located between valve A and the test piece.

[0007] The segmented pressurization mechanism includes a hydraulic cylinder and a high-pressure piston assembly. The piston rod A of the hydraulic cylinder is in the shape of a cylindrical tube. The high-pressure piston assembly includes a piston rod B and a piston B. The piston B is fixedly fitted onto one end of the piston rod B, and the piston B is located inside the piston rod A and slidably connected to the piston rod A. The piston rod B is in the shape of a cylindrical tube and is fixedly installed. The end of the piston rod B away from the piston B is connected to the end of the replenishment pipe away from the liquid medium replenishment mechanism.

[0008] The ratio of the cross-section of the inner cavity of piston rod A to the cross-section of the inner cavity of piston rod B is not less than 50.

[0009] The drive mechanism includes an oil tank and a hydraulic pump. The oil tank is connected to the rodless chamber of the hydraulic cylinder through a return oil pipe, and a valve E is provided on the return oil pipe. The hydraulic pump is connected to the oil tank through a suction oil pipe and to the rodless chamber of the hydraulic cylinder through a delivery oil pipe.

[0010] The liquid medium replenishment mechanism includes an oil replenishment tank, the top of which is connected to a vent pipe, and a valve B is installed on the vent pipe. The installation height of the oil replenishment tank is higher than the installation height of the test piece and the installation height of the segmented pressurization mechanism.

[0011] The oil tank is connected to an oil injection pipe in the middle or lower part, and the oil injection pipe is equipped with a valve C.

[0012] The top of the oil tank is also equipped with an oil pressure assembly.

[0013] The hydraulic assembly includes a pressure plate and an electric cylinder. The pressure plate is located inside the oil replenishment tank and is slidably connected to the oil replenishment tank. The electric cylinder is located on the top of the oil replenishment tank, and the output shaft of the electric cylinder extends into the oil replenishment tank and is connected to the pressure plate.

[0014] Both pressure detection component A and pressure detection component B are pressure gauges.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. For test specimens, this utility model can meet very high test pressure requirements. Compared with the traditional method of replacing the hydraulic pump to meet higher test pressure requirements, it has the advantages of low test cost and high test efficiency.

[0017] 2. The ratio of the cross-section of the inner cavity of piston rod A to the cross-section of the inner cavity of piston rod B is not less than 100%. When the liquid medium in the inner cavity of piston rod A flows out through the inner cavity of piston rod B, it can achieve throttling and pressurization, thereby improving the pressure and efficiency of injecting the liquid medium into the test piece.

[0018] 3. By driving the pressure plate downwards through the electric cylinder, a portion of the liquid medium in the replenishment tank is quickly injected into the inner cavities of piston rod A and piston rod B, greatly shortening the time it takes for the liquid medium to flow from the replenishment tank into the inner cavities of piston rod A and piston rod B, thus significantly improving the test efficiency.

[0019] 4. While initially adding liquid medium into the inner cavities of piston rod A and piston rod B, simultaneously opening valve A to first fill or partially inject liquid medium into the inner cavity of the test piece can significantly shorten the time required to pressurize the test piece, thereby significantly improving test efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1-oil tank, 2-oil suction pipe, 3-hydraulic pump, 4-oil delivery pipe, 5-hydraulic cylinder, 6-piston rod A, 7-pressure detection component A, 8-valve A, 9-pressure detection component B, 10-test piece, 11-valve B, 12-valve C, 13-replenishment tank, 14-valve D, 15-injection pipe, 16-replenishment pipe, 17-piston rod B, 18-return pipe, 19-valve E, 20-pressure plate, 21-electric cylinder, 22-piston B. Detailed Implementation

[0022] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0023] like Figure 1 As shown, the present invention discloses a segmented pressurization structure for hydraulic strength testing, comprising a drive mechanism, a segmented pressurization mechanism, a liquid medium replenishment mechanism, and a test piece 10. One end of the segmented pressurization mechanism is connected to the drive mechanism, and the other end is connected to the bottom of the liquid medium replenishment mechanism via a replenishment pipe 16. A pressure detection component A7 is provided on the replenishment pipe 16 near the segmented pressurization mechanism, and a valve D14 is provided near the liquid medium replenishment mechanism. The test piece 10 is connected to the replenishment pipe 16 via an injection pipe 15, with the connection point between the injection pipe 15 and the replenishment pipe 16 located between the pressure detection component A7 and the valve D14. A valve A8 and a pressure detection component B9 are provided on the injection pipe 15, with the pressure detection component B9 located between the valve A8 and the test piece 10. In use, the liquid medium is stored through the liquid medium replenishment mechanism. The segmented pressurization process for test piece 10 is as follows: 1. Close valve A8 and open valve D14, allowing the liquid medium replenishment mechanism to supply liquid medium to the segmented pressurization mechanism; 2. Close valve D14 and drive the segmented pressurization mechanism to pressurize the liquid medium inside; 3. When the pressure value detected by pressure detection component A7 is greater than the pressure value detected by pressure detection component B9, open valve A8 and drive the segmented pressurization mechanism to inject a portion of its liquid medium into test piece 10; 4. Repeat steps one to three to inject the liquid medium into test piece 10 segment by segment until the pressure inside test piece 10 is increased to the required test pressure. For test piece 10, this invention can meet very high test pressure requirements. Compared with the traditional method of replacing the hydraulic pump to meet higher test pressure requirements, it has the advantages of low testing cost and high testing efficiency.

[0024] The segmented pressurization mechanism includes a hydraulic cylinder 5 and a high-pressure piston assembly. The piston rod A6 of the hydraulic cylinder 5 is in the shape of a cylindrical tube. The high-pressure piston assembly includes a piston rod B17 and a piston B22. The piston B22 is fixedly fitted onto one end of the piston rod B17 and is located inside the piston rod A6 and slidably connected to the piston rod A6. The piston rod B17 is in the shape of a cylindrical tube and is fixedly installed. The end of the piston rod B17 away from the piston B22 is connected to the end of the liquid replenishment pipe 16 away from the liquid medium replenishment mechanism.

[0025] The ratio of the cross-section of the inner cavity of piston rod A6 to the cross-section of the inner cavity of piston rod B17 is not less than 50. When the liquid medium in the inner cavity of piston rod A6 flows out through the inner cavity of piston rod B17, throttling and pressurization can be achieved, improving the pressure and efficiency of injecting the liquid medium into the test piece 10.

[0026] The drive mechanism includes an oil tank 1 and a hydraulic pump 3. The oil tank 1 is connected to the rodless chamber of the hydraulic cylinder 5 through a return oil pipe 18, and a valve E19 is provided on the return oil pipe 18. The hydraulic pump 3 is connected to the oil tank 1 through a suction oil pipe 2 and to the rodless chamber of the hydraulic cylinder 5 through a delivery oil pipe 4.

[0027] The liquid medium replenishment mechanism includes a replenishment tank 13. A vent pipe is connected to the top of the replenishment tank 13, and a valve B11 is installed on the vent pipe. The installation height of the replenishment tank 13 is higher than the installation height of the test piece 10 and the installation height of the segmented pressurization mechanism. When there is no liquid medium in the test piece 10 and no oil pressure assembly is installed on the replenishment tank 13, because the installation height of the replenishment tank 13 is higher than the installation height of the test piece 10 and the installation height of the segmented pressurization mechanism, opening valves A8, D14, and B11 will automatically add some of the liquid medium from the replenishment tank 13 into the inner cavities of the test piece 10, piston rod A6, and piston rod B17.

[0028] The oil replenishment tank 13 is connected to an oil injection pipe in the middle or lower part, and the oil injection pipe is equipped with a valve C12. This facilitates the replenishment of liquid medium into the oil replenishment tank 13 through the oil injection pipe.

[0029] The top of the oil replenishment tank 13 is also equipped with an oil pressure assembly.

[0030] The oil pressure assembly includes a pressure plate 20 and an electric cylinder 21. The pressure plate 20 is located inside the oil replenishment tank 13 and is slidably connected to the oil replenishment tank 13. The electric cylinder 21 is located at the top of the oil replenishment tank 13, and the output shaft of the electric cylinder 21 extends into the oil replenishment tank 13 and is connected to the pressure plate 20. By driving the pressure plate 20 downward through the electric cylinder 21, a portion of the liquid medium in the oil replenishment tank 13 is rapidly injected into the inner cavities of piston rod A6 and piston rod B17, greatly shortening the time for the liquid medium to flow from the oil replenishment tank 13 into the inner cavities of piston rod A6 and piston rod B17, and significantly improving the test efficiency.

[0031] Both pressure detection components A7 and B9 are pressure gauges. The pressure value detected by pressure detection component A7 can be regarded as the hydraulic pressure inside piston rod B17, and the pressure value detected by pressure detection component B9 can be regarded as the hydraulic pressure inside test piece 10.

[0032] A test method for a segmented pressurization structure for hydraulic strength testing includes the following steps:

[0033] Step 1: Open valves A8, B11, D14, and E19, and close valve C12. Then, use the oil pressurization assembly to inject a portion of the liquid medium from the replenishment tank 13 into the inner cavities of test piece 10, piston rod A6, and piston rod B17. Simultaneously with the initial injection of liquid medium into the inner cavities of piston rod A6 and piston rod B17, simultaneously opening valve A8 to fill or partially fill the inner cavity of test piece 10 with liquid medium can significantly shorten the pressurization time of test piece 10, thereby significantly improving test efficiency.

[0034] Step 3: Close valves A8, D14, and E19, and start hydraulic pump 3 to add some hydraulic oil from oil tank 1 into the rodless chamber of hydraulic cylinder 5. Piston rod A6 moves in the direction of increasing the volume of the rodless chamber, and the liquid medium in piston rod A6 and piston rod B17 is compressed and pressurized.

[0035] Step 4: When the pressure value detected by pressure detection component A7 is greater than the pressure value detected by pressure detection component B9, open valve A8 to add liquid medium to test piece 10.

[0036] Step 5: When the pressure value detected by pressure detection component A7 is equal to the pressure value detected by pressure detection component B9, and piston rod A6 no longer moves in the direction of increasing rodless chamber volume, close valve A8 and hydraulic pump 3.

[0037] Step Six: Open valves E19 and D14, and use the hydraulic assembly to inject some of the liquid medium from the replenishment tank 13 into the inner cavities of piston rod A6 and piston rod B17. Open valve E19 to depressurize the rodless chamber of hydraulic cylinder 5. As the amount of liquid medium in piston rod A6 increases, the liquid medium pushes piston rod A6 towards reducing the rodless chamber of hydraulic cylinder 5, causing piston rod A6 to gradually return to its original position.

[0038] Step 7: Repeat steps 3 to 6 to gradually increase the hydraulic pressure in the test piece 10 to the required test pressure in stages.

[0039] Specifically, all valves are gate valves.

[0040] It also includes a controller, which is electrically connected to hydraulic pump 3, valve A8, valve B11, valve C12, valve D14, valve E19, pressure detection component A7, pressure detection component B9 and electric cylinder 21, so as to realize automatic control of the entire hydraulic strength test segmented pressurization structure and automatically complete the entire test process.

Claims

1. A segmented pressurization structure for hydraulic strength testing, characterized in that: The device includes a drive mechanism, a segmented pressurization mechanism, a liquid medium replenishment mechanism, and a test piece (10). One end of the segmented pressurization mechanism is connected to the drive mechanism, and the other end is connected to the bottom of the liquid medium replenishment mechanism through a replenishment pipe (16). A pressure detection component A (7) is provided on the replenishment pipe (16) near the segmented pressurization mechanism, and a valve D (14) is provided near the liquid medium replenishment mechanism. The test piece (10) is connected to the replenishment pipe (16) through an injection pipe (15), and the connection point between the injection pipe (15) and the replenishment pipe (16) is located between the pressure detection component A (7) and the valve D (14). A valve A (8) and a pressure detection component B (9) are provided on the injection pipe (15), and the pressure detection component B (9) is located between the valve A (8) and the test piece (10).

2. The segmented pressurization structure for hydraulic strength testing as described in claim 1, characterized in that: The segmented pressurization mechanism includes a hydraulic cylinder (5) and a high-pressure piston assembly. The piston rod A (6) of the hydraulic cylinder (5) is in the shape of a round tube. The high-pressure piston assembly includes a piston rod B (17) and a piston B (22). The piston B (22) is fixedly fitted on one end of the piston rod B (17), and the piston B (22) is located inside the piston rod A (6) and is slidably connected to the piston rod A (6). The piston rod B (17) is in the shape of a round tube and is fixedly installed. The end of the piston rod B (17) away from the piston B (22) is connected to the end of the liquid replenishment pipe (16) away from the liquid medium replenishment mechanism.

3. The segmented pressurization structure for hydraulic strength testing as described in claim 2, characterized in that: The ratio of the cross-section of the inner cavity of piston rod A (6) to the cross-section of the inner cavity of piston rod B (17) is not less than 50.

4. The segmented pressurization structure for hydraulic strength testing as described in claim 2, characterized in that: The drive mechanism includes an oil tank (1) and a hydraulic pump (3). The oil tank (1) is connected to the rodless chamber of the hydraulic cylinder (5) through a return oil pipe (18), and a valve E (19) is provided on the return oil pipe (18). The hydraulic pump (3) is connected to the oil tank (1) through a suction oil pipe (2) and to the rodless chamber of the hydraulic cylinder (5) through an oil delivery pipe (4).

5. The segmented pressurization structure for hydraulic strength testing as described in claim 1, characterized in that: The liquid medium replenishment mechanism includes an oil replenishment tank (13), the top of which is connected to a vent pipe and a valve B (11) is provided on the vent pipe. The installation height of the oil replenishment tank (13) is higher than the installation height of the test piece (10) and the installation height of the segmented pressurization mechanism.

6. The segmented pressurization structure for hydraulic strength testing as described in claim 5, characterized in that: The oil tank (13) is connected to an oil injection pipe in the middle or lower part, and the oil injection pipe is equipped with a valve C (12).

7. The segmented pressurization structure for hydraulic strength testing as described in claim 5, characterized in that: The top of the oil replenishment tank (13) is also equipped with an oil pressure assembly.

8. The segmented pressurization structure for hydraulic strength testing as described in claim 7, characterized in that: The oil pressure assembly includes a pressure plate (20) and an electric cylinder (21). The pressure plate (20) is located inside the oil replenishment tank (13) and is slidably connected to the oil replenishment tank (13). The electric cylinder (21) is located on the top of the oil replenishment tank (13), and the output shaft of the electric cylinder (21) extends into the oil replenishment tank (13) and is connected to the pressure plate (20).

9. The segmented pressurization structure for hydraulic strength testing as described in claim 1, characterized in that: Both pressure detection components A (7) and B (9) are pressure gauges.

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