Self-unloading specimen protection system and method for electronic creep and rupture testing machine after power failure

Abstract

The present invention discloses a self-unloading specimen protection system and method for an electronic creep and rupture testing machine after power failure. The upper end of the specimen upper connecting rod is fixed to the top of the fixed frame. The lower end of the specimen lower connecting rod is connected to the upper end of the specimen, and the lower end of the specimen is connected to the upper end of the specimen lower connecting rod. The lower end of the specimen lower connecting rod is connected to the upper end of the connecting rod through a self-unloading device. The lower end of the connecting rod is connected to the testing machine loading system. The specimen is located in the heating furnace. The self-unloading device includes a spring, a pin and a locknut. Wherein, the end of the pin passes through the spring, the specimen lower connecting rod and the connecting rod and is sleeved with a locknut. This system and method avoid the problems of overload or fracture of the specimen caused by the cooling shrinkage stress when the creep and rupture testing machine is powered off and the UPS power is exhausted.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical properties of materials, and relates to a self-unloading sample protection system and method for an electronic creep and rupture tester after power failure. Background Technique

[0002] In the fields of energy chemical industry, aerospace, etc., since most of the equipment components operate in high-temperature and high-pressure environments for a long time, long-term creep and rupture tests are an important means to evaluate the mechanical property indexes of their components. The creep and rupture test simulates the service environment of the components, and examines the ability of the sample to resist deformation or fracture under given temperature, medium environment, and load. The test process lasts for hundreds of hours at least and tens of thousands of hours at most until the sample fractures or reaches the corresponding deformation amount.

[0003] Due to the particularity of the creep and rupture test, the laboratory construction scale is at least more than a dozen and at most hundreds of units. Due to the large number of testing machines and long test cycles, there are many factors affecting the reliability of test results during the test process. Especially when power failure occurs, if not handled properly or in a timely manner, it will cause the sample to fracture abnormally due to excessive cooling shrinkage stress, resulting in irreparable losses to the test. To ensure the safe and continuous progress of the test process, generally, the creep and rupture test laboratory is designed with a power supply mode of mains power plus UPS to ensure uninterrupted power supply for the equipment. In actual production, power outages of the mains power often occur, so ensuring the safety of the sample during the test process is a very important task. Summary of the Invention

[0004] The purpose of the invention is to overcome the above-mentioned shortcomings of the prior art, and provides a self-unloading sample protection system and method for an electronic creep and rupture tester after power failure. The system and method avoid the problems of overload or fracture of the sample due to cooling shrinkage stress when the creep and rupture tester loses power and the UPS power is exhausted.

[0005] To achieve the above purpose, the self-unloading sample protection system for an electronic creep and rupture tester after power failure according to the invention includes a UPS system, mains power, a heating furnace, and a fixed frame. Inside the fixed frame, a sample upper connecting rod, a sample, a sample lower connecting rod, a connecting rod, and a tester loading system are arranged in sequence from top to bottom. Outside the fixed frame, a tester controller and a temperature controller are arranged. Among them, the upper end of the sample upper connecting rod is fixed to the top of the fixed frame, the lower end of the sample lower connecting rod is connected to the upper end of the sample, the upper end of the sample is connected to the lower end of the sample lower connecting rod, the lower end of the sample lower connecting rod is connected to the upper end of the connecting rod through a self-unloading device, the lower end of the connecting rod is connected to the tester loading system, the sample is located inside the heating furnace, the control end of the heating furnace is connected to the temperature controller, the control end of the tester loading system is connected to the tester controller, the power supply of the heating furnace is connected to the mains power, and the temperature controller and the tester loading system are connected to the UPS system;

[0006] The self-unloading device includes a spring, a pin and an anti-stripping nut, wherein the end of the pin passes through the spring, the specimen lower connecting rod and the connecting rod and is then sleeved with the anti-stripping nut.

[0007] The method for protecting a sample by self-unloading after power failure of an electronic creep endurance testing machine according to the present invention comprises the following steps:

[0008] During the heating stage, the initial load F0 is applied to the specimen through the testing machine loading system. When the temperature of the heating furnace reaches the set target temperature, it is kept warm, and then the testing machine loading system applies the set test load F to the specimen. When the temperature of the heating furnace drops by the preset temperature, the test load applied to the specimen by the testing machine loading system is reduced to the initial load F0.

[0009] At the initial stage of the test, the spring provides a launching force F to the pin. 弹 , the pin generates friction f0 and f due to the initial load F0 or test load F, set f0<F 弹 <f, in the initial stage of the test, use the anti-drop nut to prevent the pin from popping out. After the test starts, remove the anti-drop nut 12. Since the friction force f under the test load F is greater than F 弹 , the pin can transfer the load normally, ensuring the normal progress of the test;

[0010] When the mains power is cut off, when the UPS system is powered, when the heating furnace cools down beyond the preset temperature, the test load applied to the specimen by the testing machine loading system is reduced to the initial load F0. At this time, the friction force f0 is less than F 弹 , the pin pops out, so that the lower connecting rod of the specimen remains free and the specimen is automatically unloaded.

[0011] The friction force f0=F0×μ or f=F×μ, where μ is the friction coefficient between the pin and the connecting rod.

[0012] The initial load F0 is one tenth of the test load F.

[0013] The preset temperature is 20°C.

[0014] The insulation time is 30 minutes.

[0015] The present invention has the following beneficial effects:

[0016] The electronic creep endurance tester self-unloading specimen protection system and method of the present invention is specifically operated when the mains power is cut off and the UPS system is used for power supply. When the temperature of the heating furnace drops by more than 20°C, the test load applied to the specimen by the loading system of the tester is reduced to the initial load F0. At this time, the friction force f0 is less than the pin elastic force F 弹, the pin pops out, the lower connecting rod of the specimen remains in a free state, and the specimen is automatically unloaded, avoiding the occurrence of overloading or fracture of the shrinkage stress generated by the cooling of the specimen due to the power failure of the main power supply and the exhaustion of the UPS battery. The structure is simple, the operation is convenient, and the practicability is extremely strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the schematic diagram of the present invention;

[0018] Figure 2 is the structural diagram of the self-unloading device 5 in the present invention.

[0019] Among them, 1 is the upper connecting rod of the specimen, 2 is the specimen, 3 is the lower connecting rod of the specimen, 4 is the connecting rod, 5 is the self-unloading device, 6 is the testing machine loading system, 7 is the heating furnace, 8 is the testing machine controller, 9 is the temperature controller, 10 is the spring, 11 is the pin, and 12 is the anti-loosening nut. DETAILED DESCRIPTION OF THE EMBODIMENTS [[ID=I7]]

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present invention disclosure. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0021] The structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, in which for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are only exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0022] Refer to Figure 1 and Figure 2, the self-unloading specimen protection system of the electronic creep and endurance testing machine described in the present invention after power failure includes a UPS system, mains power, a heating furnace 7 and a fixed frame. Inside the fixed frame, a specimen upper connecting rod 1, a specimen 2, a specimen lower connecting rod 3, a connecting rod 4 and a testing machine loading system 6 are arranged in sequence from top to bottom. Outside the fixed frame, a testing machine controller 8 and a temperature controller 9 are arranged. Among them, the upper end of the specimen upper connecting rod 1 is fixed to the top of the fixed frame, the lower end of the specimen lower connecting rod 3 is connected to the upper end of the specimen 2, the lower end of the specimen 2 is connected to the upper end of the specimen lower connecting rod 3, the lower end of the specimen lower connecting rod 3 is connected to the upper end of the connecting rod 4 through a self-unloading device 5, the lower end of the connecting rod 4 is connected to the testing machine loading system 6, the specimen 2 is located inside the heating furnace 7, the control end of the heating furnace 7 is connected to the temperature controller 9, the control end of the testing machine loading system 6 is connected to the testing machine controller 8, the power supply of the heating furnace 7 is connected to the mains power, and the temperature controller 9 and the testing machine loading system 6 are connected to the UPS system.

[0023] The self-unloading device 5 includes a spring 10, a pin 11 and an anti-loosening nut 12. Among them, the end of the pin 11 passes through the spring 10, the specimen lower connecting rod 3 and the connecting rod 4 and is sleeved with an anti-loosening nut 12.

[0024] The self-unloading specimen protection method of the electronic creep and endurance testing machine described in the present invention after power failure includes the following steps:

[0025] Before the test starts, in the heating-up stage, an initial load F0 is applied to the specimen 2 through the testing machine loading system 6. When the temperature of the heating furnace 7 reaches the set target temperature, it is kept warm for 30 minutes, and the testing machine loading system 6 applies a set test load F to the specimen 2. Among them, the initial load F0 is about one-tenth of the test load force F. It is set that when the temperature of the heating furnace 7 drops by 20 °C, the test load applied by the testing machine loading system 6 to the specimen 2 is reduced to the initial load F0.

[0026] When the mains power fails, the testing machine controller 8, the temperature controller 9 and the loading system are normally powered by the UPS system, the heating furnace 7 loses power, and the temperature starts to drop. When the temperature drops by more than 20 °C, the test load applied by the testing machine loading system 6 to the specimen 2 is reduced to the initial load F0.

[0027] The self-unloading device 5 includes a spring 10, a pin 11 and an anti-loosening nut 12. In the initial stage of the test, an ejection force F is provided to the pin 11 through the spring 10 弹 , the pin 11 generates frictional forces f0 and f due to the initial load F0 or the test load F. The frictional force f0 = F0 × μ or f = F × μ, where μ is the friction coefficient between the pin 11 and the connecting rod 4. It is set that f0 < F 弹<f, at the initial stage of the test, the anti-loosening nut 12 is used to prevent the pin 11 from popping out. After the test starts, the anti-loosening nut 12 is removed. Since the frictional force f under the test load F is greater than the elastic force F of the pin 11 弹 , the pin 11 can transfer the load normally, ensuring the normal progress of the test;

[0028] When the mains power fails and the UPS system is supplying power, when the temperature of the heating furnace 7 drops by more than 20 °C, the test load applied by the testing machine loading system 6 to the specimen 2 is reduced to the initial load F0. At this time, the frictional force f0 is less than the elastic force F of the pin 11 弹 , the pin 11 pops out, the lower connecting rod 3 of the specimen remains in a free state, and the specimen 2 is automatically unloaded, avoiding the occurrence of overloading or fracture of the shrinkage stress generated by the cooling of the specimen 2 due to the temperature drop of the heating furnace 7 when the mains power fails and the UPS power is exhausted.

Claims

1. A method for protecting a specimen by self-unloading after power failure of an electronic creep endurance testing machine, characterized in that: The invention relates to a sample protection system for an electronic creep endurance tester that is automatically unloaded after power failure. The sample protection system for an electronic creep endurance tester that is automatically unloaded after power failure comprises a UPS system, a mains power supply, a heating furnace (7) and a fixed frame. The fixed frame is provided with a sample upper connecting rod (1), a sample (2), a sample lower connecting rod (3), a connecting rod (4) and a tester loading system (6) in sequence from top to bottom. A tester controller (8) and a temperature controller (9) are provided outside the fixed frame. The upper end of the sample upper connecting rod (1) is fixed to the top of the fixed frame, and the lower end of the sample upper connecting rod (1) is connected to the upper end of the sample (2). The ends are connected, the lower end of the sample (2) is connected to the upper end of the sample lower connecting rod (3), the lower end of the sample lower connecting rod (3) is connected to the upper end of the connecting rod (4) through the self-unloading device (5), the lower end of the connecting rod (4) is connected to the testing machine loading system (6), the sample (2) is located in the heating furnace (7), the control end of the heating furnace (7) is connected to the temperature controller (9), the control end of the testing machine loading system (6) is connected to the testing machine controller (8), the power supply of the heating furnace (7) is connected to the mains, and the temperature controller (9) and the testing machine loading system (6) are connected to the UPS system; The self-unloading device (5) comprises a spring (10), a pin (11) and an anti-slip nut (12), wherein the end of the pin (11) passes through the spring (10), the specimen lower connecting rod (3) and the connecting rod (4) and is then sleeved with the anti-slip nut (12); The following steps are involved: In the heating stage, an initial load F0 is applied to the sample (2) by the testing machine loading system (6). When the temperature of the heating furnace (7) reaches the set target temperature, the temperature is kept constant, and then the testing machine loading system (6) applies a set test load F to the sample (2). When the temperature of the heating furnace (7) drops by a preset temperature, the test load applied by the testing machine loading system (6) to the sample (2) is reduced to the initial load F0. At the initial stage of the test, the spring (10) provides a launching force F to the pin (11). 弹 The pin (11) generates friction forces f0 and f due to the initial load F0 or the test load F. It is set that f0<F 弹 <f, in the initial stage of the test, the anti-dropping nut (12) is used to prevent the pin (11) from popping out. After the test starts, the anti-dropping nut (12) is removed. Since the friction force f under the test load F is greater than F, the pin (11) can normally transmit the load, ensuring the normal progress of the test; When the mains power is cut off and the UPS system is supplying power, when the temperature of the heating furnace (7) drops to more than the preset temperature, the test load applied by the testing machine loading system (6) to the specimen (2) is reduced to the initial load F0, at which point the friction force f0 is less than F 弹 , the pin (11) pops out, so that the lower connecting rod (3) of the specimen remains in a free state, and the specimen (2) is automatically unloaded.

2. The method for protecting a specimen by self-unloading after power failure of an electronic creep endurance testing machine according to claim 1, characterized in that: The friction force f0=F0×μ or f=F×μ, wherein μ is the friction coefficient between the pin (11) and the connecting rod (4).

3. The method for protecting a specimen by self-unloading after power failure of an electronic creep endurance testing machine according to claim 1, characterized in that: The initial load F0 is one tenth of the test load F.

4. The method for protecting a specimen by self-unloading after power failure of an electronic creep endurance testing machine according to claim 1, characterized in that: The preset temperature is 20°C.

5. The method for protecting a specimen by self-unloading after power failure of an electronic creep endurance testing machine according to claim 1, characterized in that: The insulation time is 30 minutes.

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