High-pressure hydrogen environment material fatigue tensile testing machine

Abstract

The utility model provides a fatigue tensile testing machine for a material in a high-pressure hydrogen environment, which belongs to the technical field of mechanical property testing and structurally comprises a test box body, a test box upper cover, a balance cylinder and a balance cylinder upper cover, the top of the test box body is provided with a test box upper cover which can be in airtight fit with the test box body; an inner space between the test box upper cover and the test box body forms a test cavity; an air pressure balance cavity with a widened diameter is formed in one section of the middle of a piston rod cavity in the balance cylinder; the piston rod communicates the air pressure balance cavity with the inner cavity of the test box body through the upper side opening, the balance air passage and the lower side opening to form an isobaric bin; a tensile test action machine is arranged at the top end of the piston rod. The high-pressure balance channel arranged on the piston rod is used for balancing the working air pressure of the piston rod, so that the test result of the drawing force of the electric cylinder under the high-pressure condition is prevented from being influenced by the pressure of ejecting the piston rod out of the piston rod cavity by high-pressure hydrogen. And the accuracy and precision of obtaining fatigue tensile test data can be effectively ensured.

Description

Technical Field

[0001] This utility model relates to the field of mechanical property testing technology, specifically a high-pressure hydrogen environment material fatigue tensile testing machine. Background Technology

[0002] Generally, a high-pressure hydrogen environment material mechanical testing machine is a device used to test the mechanical properties of materials in a high-pressure hydrogen environment. It is typically used to study the mechanical behavior of test materials in a hydrogen environment, especially their performance under tensile conditions.

[0003] A sealed chamber is filled with hydrogen gas at varying pressures, and the pressure is monitored to ensure stability within a preset range. The samples are then subjected to repeated tensile tests to gain a deeper understanding of the material's behavior in a hydrogen environment, providing crucial data support for material selection and design in hydrogen energy applications.

[0004] In current testing machines, the tensile moving part is driven by high pressure, so the tensile test data obtained needs to be calibrated to account for the difference between the tensile force and the high pressure inference. Due to the instability of the high-pressure hydrogen environment and the dynamic range of the tensile force, the test results are inaccurate. How to design the structure of testing equipment to balance the effects of pressure using mechanical structure is an important research direction in testing equipment design. Utility Model Content

[0005] The technical objective of this invention is to address the shortcomings of existing technologies and provide a high-pressure hydrogen environment material fatigue tensile testing machine.

[0006] The technical solution of this utility model is implemented in the following way: the high-pressure hydrogen environment material fatigue tensile testing machine of this utility model includes a test chamber, a test chamber cover, a balance cylinder, and a balance cylinder cover.

[0007] The top of the test chamber is equipped with a test chamber cover that can be airtightly fitted to it; the internal space between the test chamber cover and the test chamber constitutes the test cavity;

[0008] The balance cylinder is vertically set and fixed above the test chamber cover. The top of the balance cylinder is fixedly connected to the balance cylinder cover. A piston rod cavity is opened vertically through the balance cylinder and the balance cylinder cover. The piston rod slides into the piston rod cavity. The upper end of the piston rod extends out of the balance cylinder and the lower end extends into the test chamber.

[0009] A widened gas pressure balance chamber is provided in the middle section of the piston rod chamber inside the balance cylinder; the gas pressure balance chamber is connected to a high-pressure hydrogen gas inlet pipe that enters from the side wall of the balance bar.

[0010] The piston rod has a balancing air passage along the central axis. The upper end of the balancing air passage is set as a blind end and an upper opening is opened on one side of the top section. The upper opening is connected to the air pressure balancing chamber. The balancing air passage extends downward and a lower opening is opened on one side of the lower section. The lower opening is connected to the test chamber.

[0011] The piston rod connects the pressure balance chamber and the inner cavity of the test chamber through an upper opening, a balance air passage, and a lower opening to form an isobaric chamber.

[0012] As the moving part of the test, the piston rod has a vertical sliding stroke relative to the fixed part of the test consisting of the balance cylinder and the test chamber cover. During the entire stroke of the piston rod: the movement of the upper opening is always within the air pressure balance chamber, and the movement of the lower opening is always within the test chamber.

[0013] The piston rod is equipped with a tensile testing machine at its top.

[0014] The high-pressure hydrogen inlet pipe, the pressure balance chamber, the upper opening of the piston rod, the balance gas passage, the lower opening, and the test chamber constitute the high-pressure balance channel for the entire stroke of the piston rod.

[0015] The test chamber is equipped with a test frame, which consists of an upper support for the specimen, a lower support for the specimen, a sensor, a sensor base, and frame support columns.

[0016] A test specimen is disposed between the upper support and the lower support of the test specimen;

[0017] The bearing seat on the specimen is fixedly connected to the bottom end of the piston rod;

[0018] The lower support of the specimen is connected to the sensor;

[0019] The sensor is fixedly connected to the sensor base;

[0020] A frame support column is fixedly connected between the sensor base and the test chamber cover.

[0021] The tensile testing machine includes a top-mounted frame, servo motor, reducer, electric cylinder, double-acting cylinder, guide column, and electric cylinder support frame.

[0022] The top-mounted frame is horizontally set, and a servo motor is fixedly installed on its central axis. The servo motor is fixedly connected to a reducer, and the reducer outputs an electric cylinder to the lower part of the plate. The lower part of the electric cylinder is fixedly connected to the electric cylinder support frame. The lower end of the electric cylinder extends downward out of the electric cylinder support frame and is fixedly connected to the top of the piston rod.

[0023] Double-acting cylinders are fixedly installed on the top mounting frames on both sides of the reducer. The double-acting cylinders output cylinder rods vertically downwards from the top mounting frames. The bottom ends of the two cylinder rods are connected to the electric cylinder support frame through universal joints.

[0024] At least two guide columns are configured between the electric cylinder support frame and the top mounting frame. The bottom ends of the two guide columns are fixedly connected to the electric cylinder support frame, and the upper sections of the two guide columns are hinged to the top mounting frame through linear bearings. The top sections of the two guide columns extend upward through the linear bearings.

[0025] At least two upper pull columns are fixedly connected between the electric cylinder support frame and the balance cylinder. The top end of the upper pull column is fixedly connected to the electric cylinder support frame, and the bottom end is fixedly connected to the cylinder body of the balance cylinder.

[0026] There are at least two columns that provide a fixed connection between the top mounting frame and the test chamber.

[0027] When the double-acting cylinder locks the cylinder rod, the test chamber, column, top frame, electric cylinder support frame, pull column, balance cylinder, test chamber cover, and test frame constitute a rigid support body; the servo motor, reducer, and electric cylinder drive the piston rod to pull up, providing tensile force to the test piece;

[0028] Loosen the screws, bolts, etc., that are used to fix the connection;

[0029] When the double-acting cylinder releases the locking cylinder rod by unloading the force, the reducer retracts the electric cylinder and the double-acting cylinder retracts the cylinder rod, pulling the electric cylinder support frame, upper pull column, balance cylinder, test chamber cover, and test frame upward from the test chamber to expose or replace the test piece.

[0030] The high-pressure hydrogen pipe is connected to an upstream external high-pressure hydrogen source;

[0031] The hydrogen source is connected to a gas booster, which is connected to the high-pressure hydrogen supply pipe via a high-pressure pipeline.

[0032] The bottom of the test chamber is equipped with a hydrogen outlet pipe, which contains a one-way valve. The hydrogen outlet pipe extends out through the cabinet and is connected to a hydrogen collector at the end.

[0033] A cabinet is fixedly installed on the outside of the test chamber; a column is fixedly connected between the cabinet and the top plate; the inner wall of the cabinet is completely covered with a heat insulation layer, and there is a heat insulation space between the heat insulation layer and the test chamber.

[0034] A circulating fan is installed inside the server rack.

[0035] A low-temperature heat exchanger is installed in the cabinet located on one side of the test chamber;

[0036] A high-temperature heat exchanger is installed in the cabinet on the other side of the test chamber.

[0037] The low-temperature heat exchanger is connected to the low-temperature heat exchange pipeline outside the cabinet. The low-temperature heat exchange pipeline is configured to connect to the compressor and refrigerant circulation pipeline.

[0038] The high-temperature heat exchanger is connected to a high-temperature heat exchange pipeline outside the cabinet. The high-temperature heat exchange pipeline is equipped with a heat medium pump and a heating oil heat medium circulation pipeline.

[0039] The piston rod section of the connection between the balance cylinder and the test chamber cover is equipped with a linear straightening flange bearing, which is fixedly connected to the test chamber cover.

[0040] The beneficial effects of this utility model compared with the prior art are:

[0041] This utility model relates to a high-pressure hydrogen environment material fatigue tensile testing machine, which is used to conduct tensile fatigue tests on test pieces under high-pressure hydrogen gas environment while maintaining high pressure stability.

[0042] The high-pressure balance channel on the piston rod is used to balance the working gas pressure of the piston rod, preventing the pressure of high-pressure hydrogen pushing the piston rod out of the piston rod chamber from affecting the test results of the electric cylinder tensile force under high-pressure conditions. This effectively ensures the accuracy and precision of the fatigue tensile test data.

[0043] The high-pressure hydrogen environment material fatigue tensile testing machine of this invention is reasonably designed, simple in structure, safe and reliable, easy to use and maintain, and has great value for promotion and application. Attached Figure Description

[0044] Appendix Figure 1 This is a schematic diagram of the overall assembly structure of this utility model;

[0045] Appendix Figure 2 This is a partial structural schematic diagram of the present invention;

[0046] Appendix Figure 3 This is a partial structural diagram of the test piece replacement state of this utility model.

[0047] The markings in the attached diagram represent:

[0048] 1. Test chamber body; 2. Test chamber cover; 3. Test chamber.

[0049] 4. Balance cylinder; 5. Balance cylinder cover.

[0050] 6. Piston rod chamber; 7. Piston rod;

[0051] 8. Pressure balance chamber; 9. High-pressure hydrogen connection pipe.

[0052] 10. Balanced airway; 11. Upper opening; 12. Lower opening.

[0053] 13. Wait for the pressure to build up.

[0054] 14. High-voltage balancing channel

[0055] 15. Tensile testing machine

[0056] 16. Test frame; 17. Upper support for the specimen; 18. Lower support for the specimen; 19. Sensor; 20. Sensor base; 21. Frame support column; 22. Test specimen.

[0057] 23. Top mounting frame; 24. Servo motor; 25. Reducer; 26. Electric cylinder.

[0058] 27. Double-acting cylinder; 28. Cylinder rod; 29. ​​Universal joint.

[0059] 30. Guide post; 31. Linear bearing.

[0060] 32. Pull-up column,

[0061] 33. Columns,

[0062] 34. Rigid load-bearing structure

[0063] 35. High-pressure hydrogen gas source; 36. Gas booster; 37. High-pressure pipeline.

[0064] 38. Hydrogen outlet pipe; 39. Check valve; 40. Hydrogen collector.

[0065] 41. Server rack; 42. Column fixing point; 43. Insulation layer; 44. Circulating fan.

[0066] 45. Low-temperature heat exchanger

[0067] 46. ​​High-temperature heat exchanger

[0068] 47. Low-temperature heat exchange piping; 48. Compressor; 49. Refrigerant circulation piping.

[0069] 50. High-temperature heat exchange piping; 51. Heat medium pump; 52. Heating oil heat medium circulation piping.

[0070] 53. Straightening flange bearing. Detailed Implementation

[0071] The high-pressure hydrogen environment material fatigue tensile testing machine of this utility model will be described in detail below with reference to the accompanying drawings.

[0072] As shown in the attached figure, the high-pressure hydrogen environment material fatigue tensile testing machine of this utility model includes a test chamber, a test chamber cover, a balance cylinder, and a balance cylinder cover.

[0073] The test chamber is designed with an open top.

[0074] The top of the test chamber is equipped with a test chamber cover that can be airtightly fitted to it; the internal space between the test chamber cover and the test chamber constitutes the test cavity;

[0075] The balance cylinder is vertically set and fixed above the test chamber cover. The top of the balance cylinder is fixedly connected to the balance cylinder cover. A piston rod cavity is opened vertically through the balance cylinder and the balance cylinder cover. The piston rod slides into the piston rod cavity. The upper end of the piston rod extends out of the balance cylinder and the lower end extends into the test chamber.

[0076] A widened gas pressure balance chamber is provided in the middle section of the piston rod chamber inside the balance cylinder; the gas pressure balance chamber is connected to a high-pressure hydrogen gas inlet pipe that enters from the side wall of the balance bar.

[0077] The piston rod has a balancing air passage along the central axis. The upper end of the balancing air passage is set as a blind end and an upper opening is opened on one side of the top section. The upper opening is connected to the air pressure balancing chamber. The balancing air passage extends downward and a lower opening is opened on one side of the lower section. The lower opening is connected to the test chamber.

[0078] The piston rod connects the pressure balance chamber and the inner cavity of the test chamber through an upper opening, a balance air passage, and a lower opening to form an isobaric chamber.

[0079] As the moving part of the test, the piston rod has a vertical sliding stroke relative to the fixed part of the test consisting of the balance cylinder and the test chamber cover. During the entire stroke of the piston rod: the movement of the upper opening is always within the air pressure balance chamber, and the movement of the lower opening is always within the test chamber.

[0080] The piston rod is equipped with a tensile testing machine at its top.

[0081] The high-pressure hydrogen inlet pipe, the pressure balance chamber, the upper opening of the piston rod, the balance gas passage, the lower opening, and the test chamber constitute the high-pressure balance channel for the entire stroke of the piston rod.

[0082] The test chamber is equipped with a test frame, which consists of an upper support for the specimen, a lower support for the specimen, a sensor, a sensor base, and frame support columns.

[0083] A test specimen is disposed between the upper support and the lower support of the test specimen;

[0084] The bearing seat on the specimen is fixedly connected to the bottom end of the piston rod;

[0085] The lower support of the specimen is connected to the sensor;

[0086] The sensor is fixedly connected to the sensor base;

[0087] A frame support column is fixedly connected between the sensor base and the test chamber cover.

[0088] The tensile testing machine includes a top-mounted frame, servo motor, reducer, electric cylinder, double-acting cylinder, guide column, and electric cylinder support frame.

[0089] The top-mounted frame is horizontally set, and a servo motor is fixedly installed on its central axis. The servo motor is fixedly connected to a reducer, and the reducer outputs an electric cylinder to the lower part of the plate. The lower part of the electric cylinder is fixedly connected to the electric cylinder support frame. The lower end of the electric cylinder extends downward out of the electric cylinder support frame and is fixedly connected to the top of the piston rod.

[0090] Double-acting cylinders are fixedly installed on the top mounting frames on both sides of the reducer. The double-acting cylinders output cylinder rods vertically downwards from the top mounting frames. The bottom ends of the two cylinder rods are connected to the electric cylinder support frame through universal joints.

[0091] At least two guide columns are configured between the electric cylinder support frame and the top mounting frame. The bottom ends of the two guide columns are fixedly connected to the electric cylinder support frame, and the upper sections of the two guide columns are hinged to the top mounting frame through linear bearings. The top sections of the two guide columns extend upward through the linear bearings.

[0092] At least two upper pull columns are fixedly connected between the electric cylinder support frame and the balance cylinder. The top end of the upper pull column is fixedly connected to the electric cylinder support frame, and the bottom end is fixedly connected to the cylinder body of the balance cylinder.

[0093] There are at least two columns that provide a fixed connection between the top mounting frame and the test chamber.

[0094] When the double-acting cylinder locks the cylinder rod, the test chamber, column, top frame, electric cylinder support frame, pull column, balance cylinder, test chamber cover, and test frame constitute a rigid support body; the servo motor, reducer, and electric cylinder drive the piston rod to pull up, providing tensile force to the test piece;

[0095] Loosen the screws, bolts, etc., that are used to fix the connection;

[0096] When the double-acting cylinder releases the locking cylinder rod by unloading the force, the reducer retracts the electric cylinder and the double-acting cylinder retracts the cylinder rod, pulling the electric cylinder support frame, upper pull column, balance cylinder, test chamber cover, and test frame upward from the test chamber to expose or replace the test piece.

[0097] The high-pressure hydrogen pipe is connected to an upstream external high-pressure hydrogen source;

[0098] The hydrogen source is connected to a gas booster, which is connected to the high-pressure hydrogen supply pipe via a high-pressure pipeline.

[0099] The bottom of the test chamber is equipped with a hydrogen outlet pipe, which contains a one-way valve. The hydrogen outlet pipe extends out through the cabinet and is connected to a hydrogen collector at the end.

[0100] A cabinet is fixedly installed on the outside of the test chamber; a column is fixedly connected between the cabinet and the top plate; the inner wall of the cabinet is completely covered with a heat insulation layer, and there is a heat insulation space between the heat insulation layer and the test chamber.

[0101] A circulating fan is installed inside the server rack.

[0102] A low-temperature heat exchanger is installed in the cabinet located on one side of the test chamber;

[0103] A high-temperature heat exchanger is installed in the cabinet on the other side of the test chamber.

[0104] The low-temperature heat exchanger is connected to the low-temperature heat exchange pipeline outside the cabinet. The low-temperature heat exchange pipeline is configured to connect to the compressor and refrigerant circulation pipeline.

[0105] The high-temperature heat exchanger is connected to a high-temperature heat exchange pipeline outside the cabinet. The high-temperature heat exchange pipeline is equipped with a heat medium pump and a heating oil heat medium circulation pipeline.

[0106] The piston rod section of the connection between the balance cylinder and the test chamber cover is equipped with a linear straightening flange bearing, which is fixedly connected to the test chamber cover.

[0107] Multiple sealing rings are installed between the piston rod and the inner wall of the balance cylinder, between the piston rod and the upper cover of the balance cylinder, and between the piston rod and the upper cover of the test chamber to seal and maintain the pressure of the high-pressure hydrogen in the isobaric chamber.

Claims

1. A high-pressure hydrogen environment material fatigue tensile testing machine characterized by The test box body is provided with a test box upper cover which can be airtightly matched with the test box body; the inner space between the test box upper cover and the test box body constitutes a test cavity; The test box body is provided with a test box upper cover which can be airtightly matched with the test box body; the inner space between the test box upper cover and the test box body constitutes a test cavity; The balance cylinder is vertically arranged and fixed above the test box upper cover, the top end of the balance cylinder is fixedly connected with a balance cylinder upper cover, a piston rod cavity is vertically and through the balance cylinder and the balance cylinder upper cover; a piston rod is slidably connected into the piston rod cavity, the upper end of the piston rod extends out of the balance cylinder, and the lower end extends into the test cavity; A section of the piston rod cavity in the balance cylinder is provided with a diameter-widened air pressure balance cavity; the air pressure balance cavity is communicated with a high-pressure hydrogen connection pipe on the side wall of the balance lever; The piston rod is provided with a balance air channel along the central axis, the upper end of the balance air channel is set as a blind end and is provided with an upper side opening on one side of the top section, the upper side opening is communicated with the air pressure balance cavity; the balance air channel extends downward and is provided with a lower side opening on one side of the lower section, the lower side opening is communicated with the test cavity; The piston rod is connected with the air pressure balance cavity and the inner cavity of the test box body through the upper side opening, the balance air channel and the lower side opening to form an equal pressure chamber; The piston rod is used as a test moving part, and has a vertical up-down sliding movement stroke relative to the test fixed part constituted by the balance cylinder and the test box upper cover; in the full stroke of the piston rod: the movement stroke of the upper side opening is always in the air pressure balance cavity, and the movement stroke of the lower side opening is always in the test cavity; The top end of the piston rod is provided with a tensile test test action machine; The high-pressure hydrogen connection pipe, the air pressure balance cavity, the upper side opening of the piston rod, the balance air channel, the lower side opening, and the test cavity constitute a high-pressure balance channel for the full stroke of the piston rod.

2. The high-pressure hydrogen environment material fatigue tensile test machine according to claim 1, wherein: a test frame is arranged in the test cavity, the test frame is composed of an upper test piece bearing seat, a lower test piece bearing seat, a sensor, a sensor base and a frame support column, a test piece is arranged between the upper test piece bearing seat and the lower test piece bearing seat; the upper test piece bearing seat is fixedly connected to the bottom end of the piston rod; the lower test piece bearing seat is connected to the sensor; the sensor is fixedly connected to the sensor base; the frame support column is fixedly connected between the sensor base and the test box upper cover.

3. The high-pressure hydrogen environment material fatigue tensile test machine according to claim 1, wherein: the tensile test test action machine comprises a top-mounted upper frame, a servo motor, a speed reducer, an electric cylinder, a double-acting cylinder, a guide column and an electric cylinder bearing frame, the top-mounted upper frame is horizontally arranged, a central axis of the top-mounted upper frame is fixedly provided with the servo motor, the servo motor is fixedly connected with the speed reducer, the speed reducer outputs the electric cylinder downward, the lower section of the electric cylinder is fixedly connected to the electric cylinder bearing frame; the lower end of the electric cylinder protrudes out of the electric cylinder bearing frame and is fixedly connected to the top end of the piston rod; the double-acting cylinders are respectively fixedly arranged on both sides of the top-mounted upper frame, the double-acting cylinders output cylinder rods vertically downward of the top-mounted upper frame, the bottom ends of the two cylinder rods are respectively connected to the electric cylinder bearing frame through universal joints; ​ ​ The electric cylinder bearing frame and the top-mounted upper frame are provided with at least two guide columns, the bottom ends of the two guide columns are fixedly connected to the electric cylinder bearing frame, the upper sections of the two guide columns are hingedly connected to the top-mounted upper frame through linear bearings, and the top sections of the two guide columns pass through the linear bearings upwards; The electric cylinder bearing frame and the balance cylinder are fixedly connected with at least two upper pull columns, the top ends of the upper pull columns are fixedly connected to the electric cylinder bearing frame, and the bottom ends are fixedly connected to the cylinder body of the balance cylinder; The top-mounted upper frame and the test box body are fixedly connected with at least two columns.

4. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 1, wherein: When the double-acting cylinder locks the cylinder rod, the test box body, the column, the top-mounted upper frame, the electric cylinder bearing frame, the upper pull column, the balance cylinder, the test box upper cover and the test frame constitute a rigid body carrier; the servo motor, the speed reducer and the electric cylinder drive the piston rod to pull, thereby providing the test piece with a tensile force; The corresponding fixedly connected screws and bolts are loosened; When the double-acting cylinder unloads to unlock the cylinder rod, the speed reducer retracts the electric cylinder and the double-acting cylinder retracts the cylinder rod, thereby pulling the electric cylinder bearing frame, the upper pull column, the balance cylinder, the test box upper cover and the test frame out of the test cavity and exposing or replacing the test piece.

5. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 1, wherein: The high-pressure hydrogen gas connector is connected to a high-pressure hydrogen gas source outside. The hydrogen gas source is connected to a gas booster, and the gas booster is connected to the high-pressure hydrogen gas connector through a high-pressure pipeline.

6. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 1, wherein: The bottom of the test box body is provided with a hydrogen gas outlet connector, a one-way valve is arranged in the hydrogen gas outlet connector, the hydrogen gas outlet connector extends out of the cabinet to the outside, and the extension end is connected to a hydrogen gas collector.

7. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 1, wherein: A cabinet is fixedly arranged on the periphery of the test box body; the cabinet and the top-mounted upper plate are fixedly connected with columns; the inner wall of the cabinet is completely attached with a heat preservation layer, and the heat preservation layer and the test box body form a heat preservation space; A circulating fan is arranged in the inner cavity of the cabinet, A low-temperature heat exchanger is arranged in the cabinet on one side of the test box body; A high-temperature heat exchanger is arranged in the cabinet on the other side of the test box body.

8. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 7, wherein: The low-temperature heat exchanger is connected to a low-temperature heat exchange pipeline outside the cabinet, and the low-temperature heat exchange pipeline is connected with a compressor and a refrigerant circulation pipeline.

9. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 7, wherein: The high-temperature heat exchanger is connected to a high-temperature heat exchange pipeline outside the cabinet, and the high-temperature heat exchange pipeline is connected with a heat medium pump and a heating oil heat medium circulation pipeline.

10. The high-pressure hydrogen environment material fatigue tensile testing machine according to claim 1, wherein: The piston rod body section of the connecting part between the balance cylinder and the test box upper cover is provided with a linear righting flange bearing, and the linear righting flange bearing is fixedly connected to the test box upper cover.

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