Segmented pressurization structure for hydraulic strength test and test method

Abstract

The invention discloses a hydraulic strength test segmented pressurization structure and a test method, 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] The invention relates to a hydraulic strength test segmented pressurization structure and a test method, belonging to the technical field of hydraulic strength test. Background Art

[0002] Hydraulic parts and castings used in aerospace are required to have certain strength and rigidity. Before they are assembled on aerospace equipment, they must be subjected to hydraulic strength tests to verify whether their strength and rigidity meet the requirements.

[0003] For traditional hydraulic strength test equipment, the test pressure of the inner cavity of the test piece mainly depends on the pressure source of the hydraulic pump in the hydraulic strength test equipment, and the outlet pressure of the hydraulic pump is mainly determined by its displacement and efficiency. When the test pressure conditions required by the test piece are high, the outlet pressure of the original hydraulic pump itself cannot meet the test requirements, and it can only be replaced with a hydraulic pump with a larger displacement and efficiency. While increasing the test cost, replacing the hydraulic pump is time-consuming and will also lead to a decrease in test efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a hydraulic strength test segmented boosting structure and test method.

[0005] The present invention is achieved through the following technical solutions:

[0006] A segmented boosting structure for a hydraulic strength test comprises a driving mechanism, a segmented boosting mechanism, a liquid medium replenishing mechanism and a test piece, wherein one end of the segmented boosting mechanism is connected to the driving mechanism, and the other end is connected to the bottom of the liquid medium replenishing mechanism through a replenishing tube, a pressure detection component A is provided on the replenishing tube near the segmented boosting mechanism, and a valve D is provided near the liquid medium replenishing mechanism, the test piece is connected to the replenishing tube through an injection tube, and the connection point between the injection tube and the replenishing tube is located between the pressure detection component A and the valve D, the injection tube is provided with a valve A and a pressure detection component B, and the pressure detection component B is located between the valve A and the test piece.

[0007] The segmented boosting 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 circular tube. The high-pressure piston assembly includes a piston rod B and a piston B. The piston B is fixedly mounted on one end of the piston rod B, and the piston B is located in the piston rod A and is slidably connected to the piston rod A. The piston rod B is in the shape of a circular tube and is fixedly arranged. The end of the piston rod B away from the piston B is connected to the end of the infusion tube away from the liquid medium replenishing mechanism.

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

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

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

[0011] The middle or lower part of the oil replenishing tank is connected with an oil filling pipe, and a valve C is provided on the oil filling pipe.

[0012] An oil pressing assembly is also provided on the top of the oil replenishing tank.

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

[0014] The pressure detection component A and the pressure detection component B are both pressure gauges.

[0015] A test method for a hydraulic strength test segmented pressurization structure comprises the following steps:

[0016] Step 1: Open valve A, valve B, valve D and valve E, close valve C, and then inject part of the liquid medium in the oil replenishing tank into the inner cavity of the test piece, piston rod A and piston rod B through the oil pressure assembly;

[0017] Step 3: Close valve A, valve D and valve E, start the hydraulic pump to fill part of the hydraulic oil in the oil tank into the rodless chamber of the hydraulic cylinder, and the piston rod A moves in the direction of increasing the volume of the rodless chamber, and the liquid medium in the piston rod A and the piston rod B is compressed to hold the pressure;

[0018] Step 4: When the pressure value detected by the pressure detection component A is greater than the pressure value detected by the pressure detection component B, open valve A to add liquid medium to the test piece door;

[0019] Step 5: When the pressure value detected by the pressure detection component A is equal to the pressure value detected by the pressure detection component B, and the piston rod A no longer moves in the direction of increasing the volume of the rodless chamber, close the valve A and the hydraulic pump;

[0020] Step 6: Open valve E and valve D, and inject part of the liquid medium in the oil replenishing tank into the inner cavity of piston rod A and piston rod B through the oil pressure assembly;

[0021] Step 7: Repeat steps 3 to 6 to gradually increase the hydraulic pressure in the test piece to the required test pressure.

[0022] The beneficial effects of the present invention are:

[0023] 1. For the test piece, the present invention can meet very high test pressure condition requirements. Compared with the traditional method of replacing the hydraulic pump to meet the higher test pressure conditions, it has the advantages of low test cost and high test efficiency.

[0024] 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; when the liquid medium in the inner cavity of piston rod A flows out through the inner cavity of piston rod B, throttling and pressurization can be achieved, thereby improving the pressure and efficiency of injecting the liquid medium into the test piece.

[0025] 3. The pressure plate is driven downward by the electric cylinder to quickly inject part of the liquid medium in the oil replenishing tank into the inner cavity of the piston rod A and the piston rod B, which greatly shortens the time for the liquid medium to flow from the oil replenishing tank into the inner cavity of the piston rod A and the inner cavity of the piston rod B, and significantly improves the test efficiency.

[0026] 4. When initially filling the inner cavity of piston rod A and piston rod B with liquid medium, valve A is also opened to first fill or partially inject liquid medium into the inner cavity of the test piece, which can greatly shorten the time for pressurizing the test piece and significantly improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] In the figure: 1-oil tank, 2-oil extraction 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-oil replenishing tank, 14-valve D, 15-liquid injection pipe, 16-liquid replenishing pipe, 17-piston rod B, 18-oil return pipe, 19-valve E, 20-pressure plate, 21-electric cylinder, 22-piston B. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0030] like Figure 1As shown, a hydraulic strength test segmented boosting structure of the present invention comprises a driving mechanism, a segmented boosting mechanism, a liquid medium supplementing mechanism and a test piece 10, one end of the segmented boosting mechanism is connected to the driving mechanism, and the other end is connected to the bottom of the liquid medium supplementing mechanism through a liquid supplementing tube 16, a pressure detection component A7 is provided on the liquid supplementing tube 16 near the segmented boosting mechanism, and a valve D14 is provided near the liquid medium supplementing mechanism, the test piece 10 is connected to the liquid supplementing tube 16 through a liquid injection tube 15, and the connection point between the liquid injection tube 15 and the liquid supplementing tube 16 is located between the pressure detection component A7 and the valve D14, the liquid injection tube 15 is provided with a valve A8 and a pressure detection component B9, and the pressure detection component B9 is located between the valve A8 and the test piece 10. When in use, the liquid medium is stored through the liquid medium supplementing mechanism. The process of segmented pressurization of the test piece 10 is as follows: 1. Close valve A8, open valve D14, and the liquid medium replenishing mechanism replenishes the liquid medium into the segmented pressurization mechanism; 2. Close valve D14, and drive the segmented pressurization mechanism to pressurize the liquid medium inside it through the driving mechanism; 3. When the pressure value detected by the pressure detection component A7 is greater than the pressure value detected by the pressure detection component B9, open valve A8, and drive the segmented pressurization mechanism to inject part of the liquid medium inside it into the test piece 10 through the driving mechanism; 4. Repeat steps 1 to 3 to inject the liquid medium into the test piece 10 in segments until the pressure inside the test piece 10 is increased to the required test pressure. For the test piece 10, the present invention can meet very high test pressure condition requirements, and compared with the traditional method of replacing the hydraulic pump to meet higher test pressure conditions, it has the advantages of low test cost and high test efficiency.

[0031] The segmented boosting 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 circular tube. The high-pressure piston assembly includes a piston rod B17 and a piston B22. The piston B22 is fixedly mounted on one end of the piston rod B17, and the piston B22 is located in the piston rod A6 and is slidably connected to the piston rod A6. The piston rod B17 is in the shape of a circular tube and is fixedly arranged. The end of the piston rod B17 away from the piston B22 is connected to the end of the liquid infusion tube 16 away from the liquid medium replenishing mechanism.

[0032] The ratio of the cross section of the inner cavity of the piston rod A6 to the cross section of the inner cavity of the piston rod B17 is not less than 50. When the liquid medium in the inner cavity of the piston rod A6 flows out through the inner cavity of the piston rod B17, throttling and pressurization can be achieved, thereby improving the pressure and efficiency of injecting the liquid medium into the test piece 10.

[0033] The driving 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 an oil return pipe 18, and a valve E19 is provided on the oil return pipe 18. The hydraulic pump 3 is connected to the oil tank 1 through an oil suction pipe 2 and is connected to the rodless chamber of the hydraulic cylinder 5 through an oil delivery pipe 4.

[0034] The liquid medium replenishing mechanism includes an oil replenishing tank 13, the top of which is connected to a vent pipe, and a valve B11 is provided on the vent pipe, and the installation height of the oil replenishing tank 13 is higher than the installation height of the test piece 10 and the installation height of the segmented boosting mechanism. When there is no liquid medium in the test piece 10, and no oil pressure assembly is provided on the oil replenishing tank 13, since the installation height of the oil replenishing tank 13 is higher than the installation height of the test piece 10 and the installation height of the segmented boosting mechanism, after opening valves A8, D14 and B11, part of the liquid medium in the oil replenishing tank 13 will be automatically filled into the inner cavity of the test piece 10, piston rod A6 and piston rod B17.

[0035] The middle or lower part of the oil replenishing tank 13 is connected with an oil filling pipe, and a valve C12 is provided on the oil filling pipe, so as to facilitate replenishing the liquid medium into the oil replenishing tank 13 through the oil filling pipe.

[0036] The top of the oil replenishing tank 13 is also provided with an oil pressing assembly.

[0037] The oil pressure assembly includes a pressure plate 20 and an electric cylinder 21. The pressure plate 20 is located in the oil replenishment tank 13 and is slidably connected to the oil replenishment tank 13. The electric cylinder 21 is arranged 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. The pressure plate 20 is driven downward by the electric cylinder 21 to quickly pressurize part of the liquid medium in the oil replenishment tank 13 into the inner cavity of the piston rod A6 and the piston rod B17, which greatly shortens the time for the liquid medium to flow from the oil replenishment tank 13 into the inner cavity of the piston rod A6 and the inner cavity of the piston rod B17, and significantly improves the test efficiency.

[0038] The pressure detection assembly A7 and the pressure detection assembly B9 are both pressure gauges. The pressure value detected by the pressure detection assembly A7 can be regarded as the hydraulic pressure in the piston rod B17, and the pressure value detected by the pressure detection assembly B9 can be regarded as the hydraulic pressure in the test piece 10.

[0039] A test method for a hydraulic strength test segmented pressurization structure comprises the following steps:

[0040] Step 1: Open valve A8, valve B11, valve D14 and valve E19, close valve C12, and then inject part of the liquid medium in the oil replenishment tank 13 into the inner cavity of the test piece 10, piston rod A6 and piston rod B17 through the oil pressure assembly. When initially injecting the liquid medium into the inner cavity of piston rod A6 and piston rod B17, open valve A8 to first fill or partially inject the liquid medium into the inner cavity of the test piece 10, which can greatly shorten the time for pressurizing the test piece 10 and significantly improve the test efficiency.

[0041] Step 3, close valve A8, valve D14 and valve E19, start hydraulic pump 3 to add part of the hydraulic oil in 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 to hold the pressure.

[0042] Step 4: When the pressure value detected by the pressure detection component A7 is greater than the pressure value detected by the pressure detection component B9, the valve A8 is opened to inject liquid medium into the test piece 10.

[0043] Step 5: When the pressure value detected by the pressure detection component A7 is equal to the pressure value detected by the pressure detection component B9, and the piston rod A6 no longer moves in the direction of increasing the volume of the rodless chamber, close the valve A8 and the hydraulic pump 3.

[0044] Step 6: Open valve E19 and valve D14, and inject part of the liquid medium in the oil replenishment tank 13 into the inner cavity of piston rod A6 and piston rod B17 through the oil pressure assembly. Open valve E19 to release the pressure of the rodless cavity of hydraulic cylinder 5. As the liquid medium in piston rod A6 increases, the liquid medium pushes piston rod A6 to move in the direction of reducing the rodless cavity of hydraulic cylinder 5, so that piston rod A6 is gradually reset.

[0045] Step 7: Repeat steps 3 to 6 to increase the hydraulic pressure in the test piece 10 in stages and step by step to the required test pressure.

[0046] Specifically, each valve is a stop valve.

[0047] It also includes a controller, which is electrically connected to the 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 boosting structure and automatically complete the entire test process.

Claims

1. A hydraulic strength test segmented pressurization structure, characterized in that: The invention comprises a driving mechanism, a segmented pressurizing mechanism, a liquid medium replenishing mechanism and a test piece (10), wherein one end of the segmented pressurizing mechanism is connected to the driving mechanism, and the other end is connected to the bottom of the liquid medium replenishing mechanism through a liquid replenishing tube (16), a pressure detection component A (7) is provided on the liquid replenishing tube (16) at a position close to the segmented pressurizing mechanism, and a valve D (14) is provided at a position close to the liquid medium replenishing mechanism, the test piece (10) is connected to the liquid replenishing tube (16) through a liquid injection tube (15), and the connection point between the liquid injection tube (15) and the liquid replenishing tube (16) is located between the pressure detection component A (7) and the valve D (14), the liquid injection tube (15) is provided with a valve A (8) and a pressure detection component B (9), and the pressure detection component B (9) is located between the valve A (8) and the test piece (10).

2. The hydraulic strength test segmented pressurization structure according to claim 1, characterized in that: The segmented boosting mechanism comprises 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 circular tube. The high-pressure piston assembly comprises a piston rod B (17) and a piston B (22). The piston B (22) is fixedly sleeved on one end of the piston rod B (17). 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 circular tube and is fixedly arranged. The end of the piston rod B (17) away from the piston B (22) is connected to the end of the liquid replenishing tube (16) away from the liquid medium replenishing mechanism.

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

4. The hydraulic strength test segmented pressurization structure according to claim 2, characterized in that: The driving mechanism comprises an oil tank (1) and a hydraulic pump (3); the oil tank (1) is connected to the rodless chamber of the hydraulic cylinder (5) via an oil return pipe (18), and a valve E (19) is provided on the oil return pipe (18); the hydraulic pump (3) is connected to the oil tank (1) via an oil extraction pipe (2), and is connected to the rodless chamber of the hydraulic cylinder (5) via an oil delivery pipe (4).

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

6. The hydraulic strength test segmented pressurization structure according to claim 5, characterized in that: The middle or lower part of the oil replenishing tank (13) is connected to an oil filling pipe, and a valve C (12) is provided on the oil filling pipe.

7. The hydraulic strength test segmented pressurization structure according to claim 5, characterized in that: The top of the oil replenishment tank (13) is also provided with an oil pressure assembly.

8. The hydraulic strength test segmented pressurization structure according to claim 7, characterized in that: The oil pressure assembly comprises a pressure plate (20) and an electric cylinder (21); the pressure plate (20) is located in the oil replenishing tank (13) and is slidably connected to the oil replenishing tank (13); the electric cylinder (21) is arranged on the top of the oil replenishing tank (13), and the output shaft of the electric cylinder (21) extends into the oil replenishing tank (13) and is connected to the pressure plate (20).

9. The hydraulic strength test segmented pressurization structure according to claim 1, characterized in that: The pressure detection assembly A (7) and the pressure detection assembly B (9) are both pressure gauges.

10. A test method for a hydraulic strength test segmented pressurization structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Open valve A (8), valve B (11), valve D (14) and valve E (19), close valve C (12), and then inject part of the liquid medium in the oil replenishing tank (13) into the inner cavity of the test piece (10), piston rod A (6) and piston rod B (17) through the oil pressure assembly; Step 3: Close valve A (8), valve D (14) and valve E (19), start the hydraulic pump (3) to fill part of the hydraulic oil in the oil tank (1) into the rodless chamber of the hydraulic cylinder (5), and the piston rod A (6) moves in the direction of increasing the volume of the rodless chamber, and the liquid medium in the piston rod A (6) and the piston rod B (17) is compressed to hold the pressure; Step 4: When the pressure value detected by the pressure detection component A (7) is greater than the pressure value detected by the pressure detection component B (9), the valve A (8) is opened to inject the liquid medium into the door of the test piece (10); Step 5: When the pressure value detected by the pressure detection component A (7) is equal to the pressure value detected by the pressure detection component B (9), and the piston rod A (6) no longer moves in the direction of increasing the volume of the rodless chamber, close the valve A (8) and the hydraulic pump (3); Step 6: Open valve E (19) and valve D (14), and inject part of the liquid medium in the oil replenishing tank (13) into the inner cavity of piston rod A (6) and piston rod B (17) through the oil pressure assembly; Step 7: Repeat steps 3 to 6, thereby increasing the hydraulic pressure in the test piece (10) in stages and gradually to the required test pressure.

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