A creep test device in high temperature environment

Abstract

A creep test device under high temperature environment includes a power-off unloading protection system, which has a control cylinder, an execution cylinder and an adjustment cylinder. The control cylinder and the execution cylinder are interconnected and respectively filled with hydraulic agents. A piston is arranged in the control cylinder, and a counterweight is arranged on the top of the piston. The piston cooperates with a power-off action component arranged on the control cylinder. The power-off action component is used to clamp the limit piston in the horizontal direction in the power-on state, and release the limit on the piston after power failure so that the piston slides downward under the action of the counterweight; a tray is arranged in the execution cylinder, and the tray is used to receive the weight after being pushed up by the hydraulic agent in the execution cylinder to complete the unloading of the sample; the adjustment cylinder has an adjustment component for adjusting the change of its own volume cavity, and the volume cavity of the adjustment cylinder interacts with the hydraulic agent in the control cylinder or the execution cylinder through the change of its own volume to adjust the height of the tray. The present invention can reduce power loss while unloading the sample when the power is off, and reduce the additional floor space generated by the unloading facility.

Description

Technical Field

[0001] The invention relates to the field of mechanical property testing of metal samples, in particular to a creep testing device under high temperature environment. Background Art

[0002] The high temperature creep test is a test of the mechanical properties of metal materials. After the rod-shaped or plate-shaped metal specimen is heated to the test temperature through a heating furnace, a certain load is applied through a loading system such as weights, and its deformation performance under specific temperature and load conditions is measured. The test time of the high temperature creep test is measured in months or even years. If a power outage occurs during the test, the heating furnace will be shut down, and the specimen will quickly cool down under the load state, causing the specimen to break quickly, thus wasting the manpower, equipment and time costs invested in the early stage of the test.

[0003] In order to solve the problem of fracture caused by cooling down of the sample under load after power failure, CN201410633401.0 discloses a mechanical creep test machine power failure test workpiece protection device, which uses a permanent magnet to adsorb the tray and compress the spring. After power failure, the permanent magnet disappears and the spring is restored, so that the tray is lifted by the spring to carry the weight, and then the sample is unloaded. In this way, even if the sample temperature decreases with the power failure of the heating furnace, it will not break. After the creep device is powered on, it can be reheated and loaded to continue to complete the high-temperature creep test. However, the weights of the existing high-temperature creep test range from tens of kilograms to tons. If the weights need to be fully supported by the tray to achieve the purpose of unloading, the spring needs to provide sufficient vertical thrust, so that when the spring is in a compressed state, the electromagnet needs to generate a strong adsorption force on the tray to suppress the spring, and then the electromagnet needs a large power. Because the test cycle of the high-temperature creep test is too long, although the protection device only works when the power is off, it still needs to maintain the electromagnet adsorbing the tray state and continue until the end of the test, which causes a meaningless waste of electric energy.

[0004] In order to reduce energy waste, CN202939088U discloses a power-off specimen protection device for a creep machine, which significantly increases the weight of the weight that can be lifted by the counterweight block after the permanent magnet is powered off through a lever structure, and absorbs the counterweight block of smaller weight by a permanent magnet of smaller power. During the falling process of the counterweight block after power off, the lever increases its torque so that the tray can lift the heavier weight. Although this technical solution solves the problem of energy waste by high-power permanent magnets, it causes the volume or floor space of the entire creep test device to increase significantly due to the lever, which is not conducive to implementation in a test field with limited space. Summary of the invention

[0005] The present invention aims to provide a creep test device in a high temperature environment, which can reduce power loss and the additional floor space generated by the unloading facility while unloading the sample when the power is cut off.

[0006] In order to solve the above technical problems, the specific scheme adopted by the present invention is: a creep test device under high temperature environment, including a frame and a sample clamping system, a sample heating system and a sample loading system arranged on the frame, the sample loading system including weights and a pull rope connecting the weights to the sample clamping system, and also including a power-off unloading protection system, the power-off unloading protection system has a control cylinder, an execution cylinder and an adjustment cylinder, the control cylinder and the execution cylinder are both distributed vertically and are open at the top, the control cylinder and the execution cylinder are connected to each other and are respectively filled with hydraulic agents, a piston is arranged in the control cylinder, and a piston is arranged on the top There is a counterweight block, and an annular clamping groove is provided on the periphery of the piston. The clamping groove cooperates with the power-off action component arranged on the control cylinder. The power-off action component is used to clamp the limit piston in the horizontal direction when the power is on, and release the limit on the piston after the power is off so that the piston slides downward under the action of the counterweight block; a tray is provided in the execution cylinder, and the tray is used to receive the weight after being pushed up by the hydraulic agent in the execution cylinder to complete the unloading of the sample; the adjusting cylinder has an adjusting component for adjusting the change of its own volume cavity, and the volume cavity of the adjusting cylinder interacts with the hydraulic agent in the control cylinder or the execution cylinder through the change of its own volume to adjust the height of the tray.

[0007] Preferably, the adjusting cylinder is arranged at a position on one side of the lower part of the executing cylinder, a partition is slidably provided in the cylinder body of the adjusting cylinder, and a flexible bag connected with the executing cylinder is provided in the cylinder body on one side of the partition; the adjusting component is a screw threadedly engaged with the cylinder wall of the cylinder body, one end of the screw extends into the cylinder body and rotatably cooperates with the shaft seat arranged on the partition, and the other end of the screw is located outside the cylinder body and is provided with a driving member.

[0008] Preferably, the adjusting cylinder includes a cylinder plate slidably arranged in the actuator cylinder and a sleeve-shaped flexible connection, one end of the flexible connection is connected to the cylinder plate along the circumference of the cylinder plate, and the other end is fixed to the inner side of the cylinder wall of the actuator cylinder, and a volume cavity is enclosed by the cylinder plate, the flexible connection and the corresponding cylinder wall of the actuator cylinder; the adjusting component is a screw threadedly engaged with the cylinder wall of the actuator cylinder, one end of the screw extends into the actuator cylinder and rotates with the cylinder plate, and the other end is located outside the actuator cylinder and is provided with a driving member.

[0009] Preferably, it comprises a control cylinder and a plurality of execution cylinders, the adjustment cylinder is connected to the control cylinder, and the execution cylinders are respectively arranged under the weights of different creep test devices.

[0010] Preferably, the power-off action component includes a clamping shaft, a spring and an electromagnet. The clamping shaft is slidably installed in a horizontal sliding hole opened in the cylinder wall of the control cylinder. The inner end of the clamping shaft extends into the control cylinder and forms a clamping end that cooperates with the clamping groove. The outer end of the clamping shaft is provided with a permanent magnet. The electromagnet is used to adsorb the permanent magnet and maintain the clamping state between the clamping end and the clamping groove when the power is on. The spring is in a compressed state and is used to push the clamping shaft outward after the electromagnet is powered off to make the clamping end disengage from the clamping groove.

[0011] Preferably, the power-off action component includes a clamping shaft, a controller and a driving element. The clamping shaft is slidably mounted in a horizontal sliding hole opened in the cylinder wall of the control cylinder. The inner end of the clamping shaft extends into the control cylinder and forms a clamping end that cooperates with the clamping groove. The controller signal is connected to a power-off sensor and a UPS power supply for detecting the power supply status of the creep test device. A control program is built into the controller. The control program is used to connect the driving element to the UPS power supply after the power-off sensor detects the power-off state, so as to drive the clamping end of the clamping shaft to disengage from the clamping groove.

[0012] Preferably, the driving element is an electromagnet fixed on the cylinder wall of the control cylinder and spaced apart from the outer end of the clamping shaft, and a permanent magnet that is adsorbed and matched with the power supply magnet is provided at the outer end of the clamping shaft.

[0013] Preferably, the driving element is a motor, a lead screw is connected to the motor output shaft, and a nut which is mounted in cooperation with the lead screw is provided in the clamping shaft.

[0014] Preferably, a roller that rolls in cooperation with the horizontal sliding hole or the clamping groove is provided on the clamping shaft.

[0015] Preferably, the liquid level of the hydraulic agent in the actuator cylinder is lower than the liquid level of the hydraulic agent in the control cylinder, and the inner diameter of the actuator cylinder is smaller than the inner diameter of the control cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The counterweight block in the present invention is clamped in the control cylinder by a piston through a power-off action component. The control cylinder and the actuator cylinder are filled with interconnected hydraulic agents. The power-off action component releases the clamping effect on the piston after power is cut off, so that the piston slides down under the gravity of the counterweight block, thereby pushing the tray in the actuator cylinder to rise, supporting the weights, and completing the unloading of the sample.

[0018] 2. The power-off action component of the present invention is blocked by a transverse clamping method. In a preferred embodiment, the transversely distributed clamping shaft also reduces friction through the cooperation of the roller and the piston, so that when a small axial force is applied to the clamping shaft, the clamping shaft can be driven to move to release the clamping effect on the piston and release the counterweight, thereby significantly reducing the power consumption of the power-off action component. In a further preferred embodiment, the controller, UPS power supply and power-off sensor are used to shut down during the normal test of the high-temperature creep equipment, and the clamping shaft is driven to move only after the power is off by a driving element such as an electromagnet or a motor, thereby avoiding energy waste.

[0019] 3. The main body of the present invention is a control cylinder and an actuator cylinder that are arranged in parallel and distributed vertically. The space occupied by the power-off protection system is not increased too much, which is conducive to improvement and upgrading in the existing high-temperature creep test site, is not restricted by the site, and is easy to promote. In the preferred embodiment, the liquid level in the control cylinder is higher than that of the actuator cylinder, and connecting holes connecting the inside and outside of the control cylinder are respectively opened on both sides of the clamping groove on the piston. The connecting hole is blocked by the clamping shaft in the initial state. After the clamping shaft moves to release the blocking effect after power failure, it connects the inside and outside of the control cylinder, so that the hydraulic agent in the control cylinder flows into the actuator cylinder under the combined action of the aforementioned counterweight block and atmospheric pressure, driving the tray to rise to lift the weight to complete the unloading. On the basis of the action of atmospheric pressure, the weight of the counterweight block can be selected to be much smaller than the weight of the weight, which further reduces the power consumption of the driving element required to drive the movement of the clamping shaft in the present invention, and is conducive to further reducing the specifications of the control cylinder and the actuator cylinder, which is convenient for the transformation of the existing compact test site. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the power-off action component part;

[0022] Figure 3 It is a schematic structural diagram of the power-off action component part in Embodiment 2 of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the power-off action component part in Embodiment 3 of the present invention;

[0024] Figure 5 It is a structural schematic diagram of embodiment 4 of the present invention;

[0025] Markings in the figure: 1. adjusting cylinder, 101. flexible bag, 102. screw, 103. hand wheel, 104. nut, 105. partition, 106. cylinder body, 107. cylinder plate, 108. soft connection, 2. tray, 3. actuator cylinder, 4. weight, 5. pull rope, 6. lifting ring, 7. counterweight, 8. piston, 9. power-off action component, 901. large roller, 902. small roller, 903. snap-on shaft, 904. electromagnet, 905. permanent magnet, 906. spring, 907. cover tube, 908. motor, 909. lead screw, 910. nut, 10. control cylinder, 11. hydraulic agent, 12. connecting pipe, 13. horizontal sliding hole, 14. snap-on groove, 15. connecting hole. DETAILED DESCRIPTION

[0026] The present invention discloses a creep test device under high temperature environment, which is the same as conventional high temperature creep equipment, and includes a frame and a sample clamping system, a sample heating system, a sample loading system and a power-off unloading protection system arranged on the frame. The clamping system includes an upper clamp for clamping and fixing the upper end of the sample and a lower clamp for clamping and fixing the lower end of the sample. After the sample is clamped and fixed by the upper clamp and the lower clamp, the sample is kept in a vertical distribution state. The lower clamp is fixed on the frame, and the upper clamp is connected to the sample loading system, and the sample loading system transfers the load to the sample through the upper clamp. The sample heating system includes a heating furnace and a temperature control component for controlling the temperature in the heating furnace. During the test, the heating furnace is closed and the sample is adjusted to the center position of the heating furnace. The temperature in the heating furnace is adjusted by the temperature control component to maintain the sample at the design temperature. The sample loading system is a weight 4, and a pull rope 5 is connected to the weight 4. The pull rope 5 is connected to the upper clamp through a pulley arranged on the frame, and different tensile loads are applied to the sample by setting weights 4 of different weights. The above rack, sample clamping system, and sample heating system of the present invention are the same as those of a conventional high temperature creep tester, which are not shown in the figure and will not be described in detail. The technical solution of the power-off unloading protection system in the present invention is described below through 5 embodiments:

[0027] Example 1

[0028] like Figure 1 As shown, the main structure of the power-off unloading protection system of this embodiment is a control cylinder 10, an executive cylinder 3 and an adjustment cylinder 1. The control cylinder 10 is used to detect the power supply status of the high-temperature creep test equipment and generate an action after power failure. The executive cylinder 3 further acts according to the action of the control cylinder 10 after power failure, and lifts the weight 4 in the sample loading system through the tray 2, relaxes the pull rope 5, and unloads the sample. The adjustment cylinder 1 is used to adjust the height of the tray 2 in the initial state, so as to adapt to the use of creep test equipment with different weights 4 sizes or heights. Specifically:

[0029] The cross section of the actuator cylinder 3 is circular, distributed vertically and with an open top located directly below the weight 4. The actuator cylinder 3 contains a hydraulic agent 11 composed of hydraulic oil or water, and the tray 2 floats on the liquid surface of the hydraulic agent 11 in the actuator cylinder 3. There is a small gap between the upper edge of the tray 2 and the bottom of the weight 4. The outer periphery of the tray 2 is tightly and flexibly slidably matched with the inner wall of the actuator cylinder 3 with low friction, so that when the liquid level of the hydraulic agent 11 in the actuator cylinder 3 rises, the tray 2 is driven to rise synchronously, and then the weight 4 is lifted to complete the unloading.

[0030] The cross section of the control cylinder 10 is circular, vertically distributed and open at the top, and the same hydraulic agent 11 is poured into the control cylinder 10. The bottom of the control cylinder 10 is connected to the actuator cylinder 3 through a connecting pipe 12, so that the hydraulic agent 11 can flow between the control cylinder 10 and the actuator cylinder 3 under the action of external force. A piston 8 is provided at the liquid level of the hydraulic agent 11 in the control cylinder 10, and the outer edge of the piston 8 corresponds to the shape of the inner edge of the control cylinder 10 and has a flexible matching part that is tightly matched with the inner edge of the control cylinder 10, so that after the piston 8 is driven to rise by external force, part of the hydraulic agent 11 in the actuator cylinder 3 is sucked into the control cylinder 10, so that the liquid level of the hydraulic agent 11 in the actuator cylinder 3 decreases; after the piston 8 is driven to descend by external force, part of the hydraulic agent 11 in the control cylinder 10 is discharged into the actuator cylinder 3, so that the liquid level in the actuator cylinder 3 increases, so as to push the push plate to rise to support the weight 4.

[0031] In this embodiment, the external force used to drive the hydraulic agent 11 to flow into the actuator cylinder 3 so that the tray 2 supports the weight 4 is composed of two parts:

[0032] Part of the driving force is the gravity that drives the piston 8 to descend, and the gravity comes from the weight of the counterweight 7 fixed on the piston 8. Since the weight 4 is lifted by the combined force, the weight of the counterweight 7 in this embodiment is less than the weight 4. A lifting ring 6 is fixed on the top of the weight 4 so that the piston 8 and the counterweight 7 can be lifted to the normal state by the lifting equipment when the power is turned on again after power failure. In the initial state of this embodiment, the counterweight 7 and the piston 8 are clamped in the control cylinder 10 through multiple power-off action components 9 distributed along the circumference of the control cylinder 10. Figure 1 The control cylinder 10 is shown in the upper position. After power failure, all power-off card action components release the clamping effect on the piston 8. Under the action of gravity, the counterweight block 7 drives the piston 8 downward, and part of the hydraulic agent 11 in the control cylinder 10 is discharged into the execution cylinder 3 to push the tray 2 up.

[0033] like Figure 2 As shown, the power-off action assembly 9 in this embodiment cooperates with the clamping groove 14 arranged in the circumferential direction of the piston 8 to clamp the piston 8 and the counterweight block 7 in the Figure 1 The main body of the power-off action assembly 9 is a clamping shaft 903 that passes through a horizontal sliding hole 13 provided on the cylinder wall of the control cylinder 10 in the horizontal direction. The inner end of the clamping shaft 903 ( Figure 2 The outer end of the clamping shaft 903 ( Figure 2The left end of the control cylinder 10 extends out of the control cylinder 10 and is fixed with a permanent magnet 905. The permanent magnet 905 is slidably fitted in a cover tube 907 fixed on the outer wall of the control cylinder 10 and docked with the horizontal sliding hole 13. An electromagnet 904 is fixed on the right side of the permanent magnet 905 in the cover tube 907. The electromagnet 904 is annular, and its center hole is passed through by the clamping shaft 903. The internal coil of the electromagnet 904 is connected to the power supply of the high-temperature creep test equipment. Under normal conditions, it is in an energized state and produces an adsorption of the permanent magnet 905, maintaining the clamping end and the clamping groove 14 to clamp the positioning piston 8. A spring 906 is provided on the left side of the permanent magnet 905 in the cover tube 907. The two ends of the spring 906 are respectively fixed to the permanent magnet 905 and the bottom of the cover tube 907 and are in a stretched state. After the high-temperature creep equipment is powered off, the electromagnet 904 is also powered off, causing the magnetism to disappear. The permanent magnet 905 and the clamping shaft 903 move to the left under the pulling force of the spring 906, causing the clamping end to disengage from the clamping groove 14, thereby releasing the clamping effect on the piston 8, and then causing the piston 8 and the counterweight block 7 to slide vertically under the action of gravity.

[0034] Since the electromagnet 904 in this embodiment needs to maintain a power supply state under normal conditions, in order to realize the energy saving of the present invention, a low-power electromagnet 904 is used to suppress the effect of the potential energy of the spring 906 used to drive the rebound of the clamping shaft 903. In this embodiment, a roller system is also provided on the clamping shaft 903, and the rolling cooperation of the roller is used to reduce the friction force of the clamping shaft 903 sliding in the horizontal direction, so that the elastic potential energy of the smaller spring 906 can drive the clamping shaft 903 to move left, so that the permanent magnet 905 produces a smaller adsorption force, that is, suppresses the elastic potential energy of the spring 906, thereby saving electric energy. The cross-section of the clamping shaft 903 is rectangular, and the horizontal sliding hole 13 is generally rectangular and slightly larger than the clamping shaft 903. The roller system includes a small roller 902 that is rotatably arranged on the circumference of the clamping shaft 903 and rolls with the inner wall of the horizontal sliding hole 13, and a large roller 901 that is rotatably arranged on the clamping end and rolls with the groove wall of the clamping groove 14. The rims of the small roller 902 and the large roller 901 are both made of rubber material, and in the initial state, they are in tight contact with the hole wall of the horizontal sliding hole 13 and the groove wall of the clamping groove 14 respectively.

[0035] In this embodiment, another force driving the tray 2 to float upward comes from atmospheric pressure. Figure 1 As shown, in the initial state, the liquid level of the hydraulic agent 11 in the control cylinder 10 is higher than that of the actuator cylinder 3. However, since the upper part of the control cylinder 10 is closed by the piston 8, the hydraulic agent 11 above the control cylinder 10 cannot flow into the actuator cylinder 3 by itself. In order to reasonably utilize the atmospheric pressure, Figure 2 As shown, the piston 8 is provided with connecting holes 15 on both sides of the clamping groove 14 for connecting the inside and outside of the control cylinder 10. Figure 2In the initial state of the clamping shaft 903 clamping the piston 8, the two communication holes 15 are sealed by the upper and lower sides of the large roller 901 to maintain the initial state. After the power is turned off, the clamping end of the clamping shaft 903 is disengaged from the clamping groove 14, and the large roller 901 is separated from the communication hole 15, and the control cylinder 10 is connected to the outside atmosphere through the two communication holes 15. The hydraulic agent 11 in the control cylinder 10 is partly rapidly poured into the actuator cylinder 3 under the action of atmospheric pressure, pushing the tray 2 up.

[0036] In this embodiment, the inner mirror of the control cylinder 10 is larger than the actuator cylinder 3, so that once the connecting hole 15 connects the control cylinder 10 to the atmosphere, the hydraulic agent 11 in the control cylinder 10 flows into the actuator cylinder 3 until the balance is reached. The amount of hydraulic agent 11 flowing into the actuator cylinder 3 under unit height conditions can be increased, thereby lifting the tray 2 to a higher amplitude, which is conducive to reducing the specifications of the control cylinder 10 and the actuator cylinder 3 and reducing the footprint of this embodiment.

[0037] In summary, once the high-temperature creep equipment is powered off, the spring 906 pulls the clamping shaft 903 outward to disengage the clamping end from the clamping groove 14. The hydraulic agent 11 in the control cylinder 10 is squeezed into the actuator cylinder 3 under the gravity of the counterweight block 7 on the one hand, and is pressed into the actuator cylinder 3 under the action of atmospheric pressure on the other hand. The combination of the two forces increases the amount of hydraulic agent 11 in the control cylinder 10, and the liquid level rises, driving the tray 2 to rise and receive the weight 4.

[0038] Still Figure 1 As shown, the adjusting cylinder 1 of this embodiment is arranged on the right side of the lower part of the actuating cylinder 3. The adjusting cylinder 1 is cylindrical and distributed in the transverse direction. A partition 105 is slidably arranged in the cylinder body 106 of the adjusting cylinder 1. A flexible capsule 101 connected to the actuating cylinder 3 is arranged in the cylinder body 106 on the left side of the partition 105. The flexible capsule 101 is connected to the actuating cylinder 3. The hydraulic agent 11 in the actuating cylinder 3 automatically fills the flexible capsule 101 under the action of gravity, and the flexible capsule 101 expands to the entire space of the cylinder body 106 on the left side of the partition 105. A screw rod 102 is arranged on the right side of the partition 105. The left end of the screw rod 102 is engaged and rotated with the partition 105, and the middle part is screwed with the nut 104 arranged on the right end cover of the cylinder body 106. The right end extends out of the cylinder body 106 and is connected with a hand wheel 103 as a driving member. When the hand wheel 103 is turned, the screw 102 and the nut 104 can cooperate to drive the partition 105 to move along the cylinder body 106, thereby changing the capacity of the volume chamber on the left side of the partition 105 in the cylinder body 106, adjusting the amount of the hydraulic agent 11 in the flexible bag 101, and then adjusting the liquid level of the hydraulic agent 11 in the actuator cylinder 3 and the height of the tray 2, so as to adapt to the use of high-temperature creep equipment with different weight 4 heights.

[0039] Example 2

[0040] The main structure of this embodiment is the same as that of embodiment 1, except that in this embodiment, the power-off action component 9 starts to supply power only after power is off, so as to avoid the electromagnet 904 in embodiment 1 still needing to be continuously powered to maintain the clamping state of the clamping shaft 903 with the piston 8 and the counterweight 7 during a normal high-temperature creep test.

[0041] like Figure 3 As shown, the power-off action component 9 of this embodiment is also a clamping shaft 903, a permanent magnet 905 and an electromagnet 904, the difference is that the electromagnet 904 is fixed in the cover tube 907 and is located at the left side of the permanent magnet, and the spring 906 is sleeved on the clamping shaft 903 and is located between the permanent magnet 905 and the outer cylinder wall of the control cylinder 10 and is in a natural elongated state to maintain the clamping fit between the clamping end and the clamping groove 14. The difference is that the power-off action component 9 of this embodiment also includes a power-off sensor, a controller and a UPS power supply. The UPS power supply and the power-off sensor are both connected to the controller by signal, and the controller is built with a control program, and the control program is used to connect the electromagnet 904 to the UPS power supply after the power-off sensor detects the power-off state, and the electromagnet 904 absorbs the permanent magnet to move left to drive the clamping end of the clamping shaft 903 to disengage from the clamping groove 14. After the clamping end is separated from the clamping groove 14 , the hydraulic agent 11 in the control cylinder 10 still flows into the execution cylinder 3 under reasonable action as in the first embodiment to push the tray 2 up to support the weight 4 .

[0042] Example 3

[0043] This embodiment and embodiment 2 are based on the same concept, and both start the power supply action of the power-off action component 9 only after the power is turned off, so as to avoid the electromagnet 904 in embodiment 1 still needing to be continuously powered to maintain the clamping state of the clamping shaft 903 with the piston 8 and the counterweight block 7 during the normal high-temperature creep test.

[0044] like Figure 4 As shown, the left end of the clamping shaft 903 in this embodiment is provided with a nut 910, and a motor 908 is provided in the cover tube 907. The output shaft of the motor 908 is horizontally distributed and provided with a lead screw 909 that cooperates with the nut 910, that is, the clamping shaft 903 is driven to move horizontally by the rotation of the output shaft of the motor 908. Similar to the embodiment 2, this embodiment also includes a power failure sensor, a controller and a UPS power supply. The control program in the controller connects the motor 908 to the UPS power supply after the power failure sensor detects the power failure state, and drives the clamping end of the clamping shaft 903 to disengage from the clamping groove 14 by the rotation of the output shaft of the motor 908.

[0045] Example 4

[0046] The difference between this embodiment and embodiment 1 is only the structure of the adjustment cylinder 1. Figure 5As shown, the regulating cylinder 1 includes a cylinder plate 107 slidably disposed in the actuator cylinder 3 and a sleeve-shaped flexible connection 108. The cylinder plate 107 is circular, and the flexible connection 108 is a corresponding cylindrical shape. The left end of the flexible connection 108 is sleeved on the outer periphery of the cylinder plate 107 and sealed and fixed, and the right end is fixed on the inner side of the cylinder wall of the actuator cylinder 3, so that the cylinder plate 107, the flexible connection 108 and the corresponding cylinder wall of the actuator cylinder 3 enclose a volume chamber that is different from the hydraulic agent 11 in the actuator cylinder 3. A screw rod 102 is provided on the right side of the cylinder plate 107, the left end of the screw rod 102 is clamped and rotatably engaged with the cylinder plate 107, the middle part is screwed and engaged with a nut 104 arranged on the cylinder wall of the actuator cylinder 3, and a hand wheel 103 is provided after the right end extends out of the actuator cylinder 3, that is, the screw rod 102 is driven to rotate by the hand wheel 103, and the rotation cooperation of the screw rod 102 and the nut 104 pushes the cylinder plate 107 to move horizontally to adjust the volume of the volume chamber, so that the liquid level of the hydraulic agent 11 in the actuator cylinder 3 changes accordingly, so as to be used in conjunction with high-temperature creep test equipment with weights 4 of different heights.

[0047] Example 5

[0048] This embodiment does not provide drawings. It has a control cylinder 10 that is the same as that of Embodiment 1 and multiple execution cylinders 3 that are the same as that of Embodiment 1. The multiple execution cylinders 3 are connected to the control cylinder 10 through connecting pipes 12 respectively. The multiple execution cylinders 3 are respectively arranged directly below the weights 4 of multiple high-temperature creep testing machines, so that one control cylinder 10 can drive the liquid surfaces in all the control cylinders 10 to float up after power failure, thereby lifting the corresponding weights 4 to complete the unloading of the corresponding samples. This makes this embodiment particularly suitable for large-scale testing institutions. The area occupied by the power-off unloading protection system can be further reduced by only setting up one control cylinder 10.

Claims

1. A creep test device for a high temperature environment, comprising a frame and a sample clamping system, a sample heating system and a sample loading system arranged on the frame, wherein the sample loading system comprises a weight (4) and a pull rope (5) connecting the weight (4) to the sample clamping system, characterized in that: The invention also includes a power-off unloading protection system, which comprises a control cylinder (10), an actuator cylinder (3) and an adjusting cylinder (1). The control cylinder (10) and the actuator cylinder (3) are both vertically distributed and open at the top. The control cylinder (10) and the actuator cylinder (3) are interconnected and respectively contain a hydraulic agent (11). A piston (8) is provided in the control cylinder (10). A counterweight (7) is provided on the top of the piston (8). An annular clamping groove (14) is provided on the periphery of the piston (8). The clamping groove (14) cooperates with a power-off action component (9) provided on the control cylinder (10). The power-off action component (9) ) is used to engage the limit piston (8) in the horizontal direction when the power is on, and to release the limit on the piston (8) after the power is off so that the piston (8) slides downward under the action of the counterweight (7); a tray (2) is provided in the execution cylinder (3), and the tray (2) is used to receive the weight (4) after being pushed up by the hydraulic agent (11) in the execution cylinder (3) to complete the unloading of the sample; the adjustment cylinder (1) has an adjustment component for adjusting the change of its own volume cavity, and the volume cavity of the adjustment cylinder (1) interacts with the hydraulic agent (11) in the control cylinder (10) or the execution cylinder (3) through the change of its own volume to adjust the height of the tray (2); It comprises a control cylinder (10) and a plurality of actuating cylinders (3), wherein the plurality of actuating cylinders (3) are respectively connected to the control cylinder (10) via connecting pipes (12), and the actuating cylinders (3) are respectively arranged under weights (4) of different creep test devices; The adjusting cylinder (1) is arranged at a position on one side of the lower part of the actuating cylinder (3); a partition (105) is slidably arranged in the cylinder body (106) of the adjusting cylinder (1); a flexible bag (101) connected to the actuating cylinder (3) is arranged in the cylinder body (106) on one side of the partition (105); the adjusting component is a screw rod (102) threadedly engaged with the cylinder wall of the cylinder body (106); one end of the screw rod (102) extends into the cylinder body (106) and is rotatably engaged with a shaft seat arranged on the partition (105); the other end of the screw rod (102) is located outside the cylinder body (106) and is provided with a driving member. The adjusting cylinder (1) comprises a cylinder plate (107) slidably arranged in the actuator cylinder (3) and a sleeve-shaped flexible connection (108), one end of the flexible connection (108) is butted against the cylinder plate (107) along the circumference of the cylinder plate (107), and the other end is fixed to the inner side of the cylinder wall of the actuator cylinder (3), and a volume cavity is enclosed by the cylinder plate (107), the flexible connection (108) and the corresponding cylinder wall of the actuator cylinder (3); the adjusting component is a screw rod (102) threadedly engaged with the cylinder wall of the actuator cylinder (3), one end of the screw rod (102) extends into the actuator cylinder (3) and is rotationally engaged with the cylinder plate (107), and the other end is located outside the actuator cylinder (3) and is provided with a driving member.

2. The creep test device under high temperature environment according to claim 1, characterized in that: The power-off action component (9) comprises a clamping shaft (903), a spring (906) and an electromagnet (904); the clamping shaft (903) is slidably mounted in a horizontal sliding hole (13) provided in the cylinder wall of the control cylinder (10); the inner end of the clamping shaft (903) extends into the control cylinder (10) and forms a clamping end that cooperates with the clamping groove (14); a permanent magnet (905) is provided at the outer end of the clamping shaft (903); the electromagnet (904) is used to absorb the permanent magnet (905) and maintain the clamping state between the clamping end and the clamping groove (14) in a power-on state; the spring (906) is in a compressed state and is used to push the clamping shaft (903) outward after the electromagnet (904) is powered off so that the clamping end is separated from the clamping groove (14).

3. The creep test device under high temperature environment according to claim 1, characterized in that: The power-off action component (9) comprises a snap-on shaft (903), a controller and a driving element. The snap-on shaft (903) is slidably mounted in a horizontal sliding hole (13) provided in a cylinder wall of a control cylinder (10). The inner end of the snap-on shaft (903) extends into the control cylinder (10) to form a snap-on end that matches with a snap-on groove (14). The controller is signal-connected to a power-off sensor for detecting the power supply status of a creep test device and a UPS power supply. A control program is built into the controller. The control program is used to connect the driving element to the UPS power supply after the power-off sensor detects the power-off status, so as to drive the snap-on end of the snap-on shaft (903) to disengage from the snap-on groove (14).

4. The creep test device under high temperature environment according to claim 3, characterized in that: The driving element is an electromagnet (904) or a motor (908).

5. A creep test device in a high temperature environment according to any one of claims 2 to 4, characterized in that: A roller is provided on the clamping shaft (903) and is in rolling cooperation with the horizontal sliding hole (13) or the clamping groove (14).

6. The creep test device in a high temperature environment according to claim 5, characterized in that: The liquid level of the hydraulic agent (11) in the actuating cylinder (3) is lower than the liquid level of the hydraulic agent (11) in the control cylinder (10); connecting holes (15) for connecting the inside and outside of the control cylinder (10) are respectively provided on both sides of the clamping groove (14); the connecting holes (15) are blocked by rollers located in the clamping groove (14).

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