Creep test clamp shared by double shafts and single shaft

Abstract

The invention belongs to the technical field of creep tests, and particularly relates to a double-shaft and single-shaft shared creep test clamp which comprises an upper box body and a lower box body, the upper box body and the lower box body are installed in a crossed mode, the upper box body is fixed to an upper connecting table through a connecting rod, the lower box body is fixed to a lower connecting table through a connecting rod, an upper threaded rod is installed on the upper connecting table, and a lower threaded rod is installed on the lower connecting table. A lower threaded rod is installed on the lower connecting table, a clamping plate is installed on the upper connecting table, a transverse pressing block is rotatably installed on the clamping plate, a guide groove is formed in the lower box body, the transverse pressing block is in sliding fit with the guide groove, a test assembly is installed on the upper box body, and a pressure applying assembly is installed on the lower box body. Firstly, the lower box body drives the push rod and the liquid pressing plate to press liquid in the pressure-resistant cabin, so that the liquid applies pressure to the test block in the pressure-resistant cabin, the state of the test block subjected to hydraulic pressure is simulated, then biaxial pressure is applied to the test block through the longitudinal rod and the transverse pressing block, and the state of the test block subjected to biaxial force under the working water level is measured.

Description

Technical Field

[0001] The invention belongs to the technical field of creep test, and in particular relates to a creep test fixture shared by a biaxial and a uniaxial test. Background Art

[0002] In recent years, titanium alloys have been widely used in deep sea exploration, aerospace, automotive industry and mechanical engineering. However, titanium alloys are prone to creep when used in marine environments. Creep of titanium alloys refers to the phenomenon that the plastic deformation of a material increases with time under a constant stress below the yield strength. Unlike plastic deformation, which usually occurs after the stress exceeds the elastic limit, creep can also occur when the stress is less than the force applied by the elastic limit as long as the stress acts for a long time.

[0003] Most existing creep testing machines can apply force to the test piece in biaxial directions and measure its creep, for example, a patent application for a biaxial compression creep test method with publication number CN116754376A. However, this method simulates the creep of titanium alloy in a normal state, while the use environment of titanium alloy is the marine environment. Under different working depth environments, the hydraulic pressure of titanium alloy is different, so the force change of titanium alloy under working state is quite different from the data measured by this method. Summary of the invention

[0004] The purpose of the present invention is to provide a creep test fixture for biaxial and uniaxial use in view of the deficiencies of the prior art, so as to solve the technical problems in the prior art.

[0005] The objective of the present invention can be achieved through the following technical scheme: a creep test fixture shared by both axes and single axes, comprising an upper box and a lower box, the upper box and the lower box are cross-mounted, the upper box is fixed to the upper connecting platform by a connecting rod, the lower box is fixed to the lower connecting platform by a connecting rod, an upper threaded rod is installed on the upper connecting platform, and a lower threaded rod is installed on the lower connecting platform, a clamping plate is installed on the upper connecting platform, a transverse pressure block is rotatably installed on the clamping plate, a guide groove is provided on the lower box, the transverse pressure block is slidably matched with the guide groove, a test assembly is installed on the upper box, and a pressure assembly is installed on the lower box; the test assembly comprises a pressure cabin, a test block is placed in the pressure cabin, a liquid inlet and a liquid discharge port are installed on the pressure cabin, a sealing door is installed on the pressure cabin, the transverse pressure block passes through the test assembly and extrude the test block laterally, and a guide sleeve is installed on the pressure cabin; the pressure assembly comprises a pressure sleeve, a longitudinal rod is slidably installed in the pressure sleeve, and the guide sleeve is slidably matched with the longitudinal rod.

[0006] As a further optimization or improvement of this solution, a rotating shaft is installed in the pressing sleeve, a pressure rod is installed on the rotating shaft, a telescopic rod is rotatably installed in the pressing sleeve, the output end of the telescopic rod is connected to the pressing rod, a pressure roller is installed on the head of the pressure rod, the pressure roller presses against the push rod, a pressure plate is installed on the push rod, a through groove is provided on the pressure plate, and the longitudinal rod is inserted into the through groove.

[0007] As a further optimization or improvement of the present solution, a fixing block is installed on the push rod, and a magnetic suction cup is installed on the damping block, and the magnetic suction cup absorbs the fixing block.

[0008] As a further optimization or improvement of the present solution, a positioning bar is installed in the pressure cabin, and the test block is placed in the positioning bar.

[0009] As a further optimization or improvement of the present solution, a guide bar is installed on the positioning bar, and the guide bar is slidably matched with the transverse pressing block.

[0010] As a further optimization or improvement of this solution, a limit block is installed in the pressing sleeve, and the side wall of the pressing rod is in contact with the limit block.

[0011] As a further optimization or improvement of the present solution, the upper connecting platform and the lower connecting platform are connected to the creep testing machine through the upper threaded rod and the lower threaded rod respectively, and the creep testing machine applies a continuous downward pulling force to the lower box through the lower connecting platform.

[0012] Beneficial effects of the present invention: (1) The present invention firstly drives the push rod and the liquid pressure plate to press the liquid inside the pressure chamber through the lower box body, so that the liquid applies pressure to the test block inside the pressure chamber, simulating the state of the test block being subjected to hydraulic pressure. Then, biaxial pressure is applied to the test block through the longitudinal rod and the transverse pressure block, and the state of the test block being subjected to biaxial force under the working water level is measured.

[0013] (2) The present invention extracts the liquid inside the pressure cabin through the drain port, pulls the pressure rod through the telescopic rod, and makes the pressure roller on the pressure rod press against the longitudinal rod. At this time, the lower box is driven downward by the creep testing machine, so that the longitudinal rod and the transverse pressure block directly apply biaxial pressure to the test block, and the state of the test block subjected to biaxial force in non-liquid is measured. Combined with the stress state of the test block under the working water level, the influence of the hydraulic pressure of the working water level on the stress degree of the test block is analyzed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the upper box and the lower box.

[0017] Figure 3This is a schematic diagram of the installation location of the test components.

[0018] Figure 4 This is the matching diagram of the test component and the pressure component.

[0019] Figure 5 This is a schematic diagram of the internal structure of the pressure cabin.

[0020] Figure 6 This is the coordination diagram between the transverse pressure block and the pressure cabin.

[0021] Figure 7 Schematic diagram of the positioning bar structure.

[0022] Figure 8 This is an exploded view of the overall structure of the pressure component.

[0023] Fig. 9 Schematic diagram of the internal structure of the compression sleeve.

[0024] Fig.10 for Fig. 9 A magnified view of the structure of part A.

[0025] The following are marked in the figure: 1. upper connecting platform; 2. upper box body; 3. upper threaded rod; 4. lower connecting platform; 5. lower box body; 6. lower threaded rod; 7. connecting rod; 8. test assembly; 801. pressure cabin; 802. sealing door; 803. guide sleeve; 804. liquid inlet; 805. liquid outlet; 806. positioning strip; 807. guide strip; 808. damping block; 9. pressure assembly; 901. pressure sleeve; 902. push rod; 903. liquid pressure plate; 904. longitudinal rod; 905. fixing block; 906. through groove; 907. pressure rod; 908. telescopic rod; 909. pressure roller; 910. limit block; 911. rotating shaft; 10. clamping plate; 11. transverse pressure block; 12. test block; 13. guide groove. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 9A creep test fixture for a biaxial and uniaxial connection is provided, which comprises an upper box body 2 and a lower box body 5, which are cross-mounted, the upper box body 2 is fixed to an upper connecting platform 1 by a connecting rod 7, the lower box body 5 is fixed to a lower connecting platform 4 by a connecting rod 7, an upper threaded rod 3 is installed on the upper connecting platform 1, and a lower threaded rod 6 is installed on the lower connecting platform 4, a clamping plate 10 is installed on the upper connecting platform 1, a lateral pressing block 11 is rotatably installed on the clamping plate 10, a guide groove 13 is provided on the lower box body 5, and the lateral pressing block 11 is slidably matched with the guide groove 13, and a test fixture is installed on the upper box body 2 The test assembly 8 has a pressure assembly 9 installed on the lower box body 5; the test assembly 8 includes a pressure cabin 801, a test block 12 is placed in the pressure cabin 801, a liquid inlet 804 and a liquid outlet 805 are installed on the pressure cabin 801, a sealing door 802 is installed on the pressure cabin 801, a transverse pressure block 11 passes through the test assembly 8 to laterally squeeze the test block 12, and a guide sleeve 803 is installed on the pressure cabin 801; the pressure assembly 9 includes a pressure sleeve 901, a longitudinal rod 904 is slidably installed in the pressure sleeve 901, and the guide sleeve 803 is slidably matched with the longitudinal rod 904.

[0028] Specifically, the upper connecting platform 1 and the lower connecting platform 4 are connected to the creep testing machine through the upper threaded rod 3 and the lower threaded rod 6 respectively, and the creep testing machine applies a continuous downward pulling force to the lower box 5 through the lower connecting platform 4 .

[0029] It should be noted that before use, the test block 12 is placed in the pressure chamber 801, the sealing door 802 is closed, the pressure chamber 801 is in a sealed state, and then the laboratory seawater is injected into the pressure chamber 801 through the liquid inlet 804; when in use, the upper connecting platform 1 and the lower connecting platform 4 are respectively connected to the creep tester through the upper threaded rod 3 and the lower threaded rod 6, and the creep tester applies a continuous tensile force to the lower connecting platform 4 and the lower box 5 through the lower threaded rod 6, and the upper connecting platform 1 and the upper box 2 are fixed during this process; During the downward movement of the lower box 5, the lower box 5 drives the pressure assembly 9 thereon to move synchronously. Fig. 9 , the telescopic rod 908 pushes the pressure rod 907 to fit the limit block 910, and the pressure roller 909 on the pressure rod 907 presses the push rod 902. As the lower box 5 moves downward, the lower box 5 drives the push rod 902 to move synchronously through the pressure rod 907 inside the pressure sleeve 901. At this time, the push rod 902 compresses the seawater inside the pressure cabin 801 through the pressure plate 903. According to Pascal's law, the hydraulic pressure of the seawater inside the pressure cabin 801 increases, so that the liquid presses the test block 12, simulating the water pressure of the working water level of the test block 12; The magnetic suction cup on the damping block 808 is started to absorb the fixed block 905 on the push rod 902 to keep the test block 12 under pressure. Then, the pressure rod 907 is pulled by the telescopic rod 908 to make the pressure roller 909 on the pressure rod 907 roll toward the longitudinal rod 904. When the pressure rod 907 presses the longitudinal rod 904, as the lower box 5 moves downward, the pressure sleeve 901 drives the longitudinal rod 904 to move downward through the pressure rod 907, so that the longitudinal rod 904 presses the test block 12 longitudinally. Figure 2 As the lower box body 5 moves downward, the distance between the lower box body 5 and the upper box body 2 gradually increases. Under the action of the sliding cooperation between the guide groove 13 and the transverse pressing block 11, the upper connecting platform 1 pushes the transverse pressing block 11 through the clamping plate 10, so that the transverse pressing block 11 presses the test block 12 laterally. At this time, the test block 12 is subjected to a biaxial force, and then the force state of the test block 12 is measured by the measuring device.

[0030] It should be noted that the present invention can increase the liquid hydraulic pressure inside the pressure-resistant cabin 801 by means of a hydraulic pump continuously delivering liquid into the pressure-resistant cabin 801 through the liquid inlet 804 .

[0031] The present invention firstly drives the push rod 902 and the liquid pressure plate 903 to squeeze the liquid inside the pressure cabin 801 through the lower box body 5, so that the liquid applies pressure to the test block 12 inside the pressure cabin 801, simulating the state of the test block 12 being subjected to hydraulic pressure, and then applies biaxial pressure to the test block 12 through the longitudinal rod 904 and the transverse pressure block 11, and measures and analyzes the state of the test block 12 subjected to biaxial force at the working water level.

[0032] The present invention extracts the liquid inside the pressure cabin 801 through the drain port 805, pulls the pressure rod 907 through the telescopic rod 908, and makes the pressure roller 909 on the pressure rod 907 press against the longitudinal rod 904. At this time, the lower box 5 is driven downward by the creep testing machine, so that the longitudinal rod 904 and the transverse pressure block 11 directly apply biaxial pressure to the test block 12, and measures the state of the biaxial force of the test block 12 in the non-liquid. Combined with the stress state of the test block 12 under the working water level, the influence of the hydraulic pressure of the working water level on the stress degree of the test block 12 is analyzed, so as to facilitate the detailed analysis of the influence of the pH value of seawater and the high concentration of chloride ions on the stress of the test block 12.

[0033] See also Figure 4-Figure 10 A rotating shaft 911 is installed in the pressing sleeve 901, a pressing rod 907 is installed on the rotating shaft 911, a telescopic rod 908 is rotatably installed in the pressing sleeve 901, the output end of the telescopic rod 908 is connected to the pressing rod 907, a pressing roller 909 is installed on the head of the pressing rod 907, the pressing roller 909 presses the push rod 902, a liquid pressing plate 903 is installed on the push rod 902, a through groove 906 is provided on the liquid pressing plate 903, and the longitudinal rod 904 is inserted into the through groove 906.

[0034] Specifically, a fixing block 905 is installed on the push rod 902 , and a magnetic suction cup is installed on the damping block 808 , and the magnetic suction cup absorbs the fixing block 905 .

[0035] Specifically, a limiting block 910 is installed in the pressing sleeve 901 , and the side wall of the pressing rod 907 is in contact with the limiting block 910 .

[0036] It should be noted that the telescopic rod 908 drives the pressure rod 907 to move, so that the pressure rod 907 rotates along the rotating shaft 911. The telescopic rod 908 pushes the pressure rod 907 to fit the limit block 910, and at this time, the pressure roller 909 on the pressure rod 907 presses the push rod 902. As the lower box 5 moves downward, the lower box 5 drives the push rod 902 to move synchronously through the pressure rod 907 inside the pressure sleeve 901. At this time, the push rod 902 compresses the seawater inside the pressure cabin 801 through the pressure plate 903; the pressure rod 907 is pulled by the telescopic rod 908, so that the pressure roller 909 on the pressure rod 907 rolls toward the longitudinal rod 904. When the pressure rod 907 presses the longitudinal rod 904, as the lower box 5 moves downward, the longitudinal rod 904 and the transverse pressure block 11 apply biaxial pressure to the test block 12.

[0037] See also Figure 6-Figure 7 A positioning bar 806 is installed in the pressure cabin 801 , and the test block 12 is placed in the positioning bar 806 .

[0038] Specifically, a guide bar 807 is installed on the positioning bar 806 , and the guide bar 807 is slidably matched with the transverse pressing block 11 .

[0039] It should be noted that the function of the positioning bar 806 is to limit the test block 12 to prevent the test block 12 from moving due to liquid pressure.

[0040] The implementation principle of the present invention is as follows: before use, the test block 12 is placed in the pressure chamber 801, the sealing door 802 is closed, the pressure chamber 801 is in a sealed state, and then the laboratory seawater is injected into the pressure chamber 801 through the liquid inlet 804; when in use, the upper connecting platform 1 and the lower connecting platform 4 are respectively connected to the creep tester through the upper threaded rod 3 and the lower threaded rod 6, and the creep tester applies continuous tension to the lower connecting platform 4 and the lower box 5 through the lower threaded rod 6, and the upper connecting platform 1 and the upper box 2 are fixed during this process; During the downward movement of the lower box 5, the lower box 5 drives the pressure assembly 9 thereon to move synchronously. Fig. 9, the telescopic rod 908 pushes the pressure rod 907 to fit the limit block 910, and the pressure roller 909 on the pressure rod 907 presses the push rod 902. As the lower box 5 moves downward, the lower box 5 drives the push rod 902 to move synchronously through the pressure rod 907 inside the pressure sleeve 901. At this time, the push rod 902 compresses the seawater inside the pressure cabin 801 through the pressure plate 903. According to Pascal's law, the hydraulic pressure of the seawater inside the pressure cabin 801 increases, so that the liquid presses the test block 12, simulating the water pressure of the working water level of the test block 12; The magnetic suction cup on the damping block 808 is started to absorb the fixed block 905 on the push rod 902 to keep the test block 12 under pressure. Then, the pressure rod 907 is pulled by the telescopic rod 908 to make the pressure roller 909 on the pressure rod 907 roll toward the longitudinal rod 904. When the pressure rod 907 presses the longitudinal rod 904, as the lower box 5 moves downward, the pressure sleeve 901 drives the longitudinal rod 904 to move downward through the pressure rod 907, so that the longitudinal rod 904 presses the test block 12 longitudinally. Figure 2 As the lower box body 5 moves downward, the distance between the lower box body 5 and the upper box body 2 gradually increases. Under the action of the sliding cooperation between the guide groove 13 and the transverse pressing block 11, the upper connecting platform 1 pushes the transverse pressing block 11 through the clamping plate 10, so that the transverse pressing block 11 presses the test block 12 laterally. At this time, the test block 12 is subjected to a biaxial force, and then the force state of the test block 12 is measured by the measuring device.

[0041] The present invention firstly drives the push rod 902 and the liquid pressure plate 903 to press the liquid inside the pressure chamber 801 through the lower box 5, so that the liquid applies pressure to the test block 12 inside the pressure chamber 801, simulating the state of the test block 12 being subjected to hydraulic pressure, and then applies biaxial pressure to the test block 12 through the longitudinal rod 904 and the transverse pressure block 11, and measures the state of the test block 12 being subjected to biaxial force under the working water level. Therefore, the data measured by the present invention is closer to the actual data.

[0042] The present invention extracts the liquid inside the pressure cabin 801 through the drain port 805, pulls the pressure rod 907 through the telescopic rod 908, and makes the pressure roller 909 on the pressure rod 907 press against the longitudinal rod 904. At this time, the lower box 5 is driven downward by the creep testing machine, so that the longitudinal rod 904 and the transverse pressure block 11 directly apply biaxial pressure to the test block 12, and measures the state of the biaxial force of the test block 12 in the non-liquid. Combined with the stress state of the test block 12 under the working water level, the influence of the hydraulic pressure of the working water level on the stress change of the test block 12 is analyzed, so as to facilitate the detailed analysis of the influence of the pH value of seawater and the high concentration of chloride ions on the stress of the test block 12.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A creep test fixture for biaxial and uniaxial testing, characterized in that: The invention comprises an upper box body (2) and a lower box body (5), wherein the upper box body (2) and the lower box body (5) are cross-mounted, the upper box body (2) is fixed to an upper connecting platform (1) via a connecting rod (7), the lower box body (5) is fixed to a lower connecting platform (4) via a connecting rod (7), an upper threaded rod (3) is mounted on the upper connecting platform (1), and a lower threaded rod (6) is mounted on the lower connecting platform (4), a clamping plate (10) is mounted on the upper connecting platform (1), a transverse pressing block (11) is rotatably mounted on the clamping plate (10), a guide groove (13) is provided on the lower box body (5), the transverse pressing block (11) is slidably matched with the guide groove (13), a test assembly (8) is mounted on the upper box body (2), and a pressure assembly (9) is mounted on the lower box body (5); The test assembly (8) comprises a pressure chamber (801), a test block (12) is placed in the pressure chamber (801), a liquid inlet (804) and a liquid outlet (805) are installed on the pressure chamber (801), a sealing door (802) is installed on the pressure chamber (801), a transverse pressing block (11) passes through the test assembly (8) to press the test block (12) transversely, and a guide sleeve (803) is installed on the pressure chamber (801); the pressure-applying assembly (9) comprises a pressing sleeve (901), a longitudinal rod (904) is slidably installed in the pressing sleeve (901), and the guide sleeve (803) is slidably matched with the longitudinal rod (904).

2. A biaxial and uniaxial creep test fixture according to claim 1, characterized in that: A rotating shaft (911) is installed in the pressing sleeve (901), a pressing rod (907) is installed on the rotating shaft (911), a telescopic rod (908) is rotatably installed in the pressing sleeve (901), an output end of the telescopic rod (908) is connected to the pressing rod (907), a pressing roller (909) is installed on the head of the pressing rod (907), the pressing roller (909) presses against the push rod (902), a liquid pressing plate (903) is installed on the push rod (902), a through groove (906) is provided on the liquid pressing plate (903), and the longitudinal rod (904) is inserted into the through groove (906).

3. A biaxial and uniaxial creep test fixture according to claim 2, characterized in that: A fixing block (905) is mounted on the push rod (902), and a magnetic suction cup is mounted on the damping block (808), and the magnetic suction cup absorbs the fixing block (905).

4. The biaxial and uniaxial creep test fixture according to claim 1, characterized in that: A positioning bar (806) is installed in the pressure-resistant cabin (801), and the test block (12) is placed in the positioning bar (806).

5. The biaxial and uniaxial creep test fixture according to claim 4, characterized in that: A guide bar (807) is installed on the positioning bar (806), and the guide bar (807) is slidably matched with the transverse pressing block (11).

6. The biaxial and uniaxial creep test fixture according to claim 1, characterized in that: A limiting block (910) is installed in the pressing sleeve (901), and a side wall of the pressing rod (907) is in contact with the limiting block (910).

7. The biaxial and uniaxial creep test fixture according to claim 1, characterized in that: The upper connecting platform (1) and the lower connecting platform (4) are respectively connected to the creep testing machine via an upper threaded rod (3) and a lower threaded rod (6), and the creep testing machine applies a continuous downward pulling force to the lower box body (5) via the lower connecting platform (4).

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