Extensometer returning device, extensometer combination and high-temperature strain measurement device

Abstract

The invention relates to an extensometer returning device, an extensometer combination and a high-temperature strain measurement device, the high-temperature strain measurement device disclosed by the invention is equipped with the extensometer returning device, and the extensometer combination can slide on a guide rail according to requirements; the extensometer returning device is provided with a steering engine and a moving wheel, and the steering engine can be controlled to drive the moving wheel to slide on the longitudinal sliding rail; when the strain of the extensometer reaches the maximum value and the temperature exceeds a safety range, the extensometer returning device can release fixation according to a sensor signal and drive the steering engine to rotate reversely to drive the extensometer to be separated from the loading test device and reversely return to a starting point, so that the function of protecting a contact rod of the extensometer is achieved; the extensometer returning device is provided with a gear pump, and the maneuvering platform and the extensometer body are fixed on the guide rail through transmission of the connecting rod assembly, so that automatic separation of the extensometer and the sample is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of test equipment, in particular to an extensometer feeding and returning device, an extensometer combination, and a high-temperature strain measurement device. Background Art

[0002] In practical engineering applications, equipment inevitably operates in harsh environments; the study of the mechanical properties of materials under high-temperature environments is crucial for the safe and economical service of equipment. The strain measurement device is an important component of material tests, used to measure the small deformation of specimens under various loads such as tension and compression, and has characteristics such as high precision, high sensitivity, and high stability. The service environment of engineering structures is relatively complex, and how to measure the deformation behavior of specimens in complex service environments is a key problem to be solved in the process of mechanical property testing; moreover, when the existing extensometers measure strain, they cannot be automatically fed and returned according to the strain situation. If the specimen encounters an accidental overheating situation in the environmental medium, the extensometer cannot be automatically separated from the loading device, which is prone to damage.

[0003] In summary, when the specimen encounters an accidental overheating situation in the environmental medium, how to achieve automatic separation of the extensometer from the specimen has become an urgent problem for researchers in this field. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: when the specimen encounters an accidental overheating situation in the environmental medium, how to achieve automatic separation of the extensometer from the specimen;

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] The present invention is an extensometer feeding and returning device, including: a guide rail; a mobile platform slidably arranged on the guide rail; a driving component adapted to drive the mobile platform to perform a linear motion along the guide rail; a pump body component arranged on the mobile platform; two first connecting rods respectively located on both sides of the mobile platform, with a travel hole opened at one end of the top; two second connecting rods, one end of which is connected to the output end of the pump body component, and the other end is connected to the travel hole; two third connecting rods, one end of which is hinged to the corresponding side of the mobile platform, and the other end is hinged to the middle of the corresponding first connecting rod; two fourth connecting rods, one end of which is hinged to the bottom of the corresponding second connecting rod, and the other end is adapted to abut against the guide rail.

[0007] Further, the driving component includes: a steering gear arranged at the tail of the mobile platform; a moving wheel rotatably arranged at the tail of the mobile platform and generating friction between the guide rails, and the rotation of the moving wheel is controlled by the steering gear.

[0008] Further, the pump body assembly includes: a gear pump disposed on the mobile platform, with an oil storage pipe provided on one side thereof, an oil storage rod disposed inside the oil storage pipe, a piston pipe provided on the other side of the gear pump, and piston rods provided on both sides of the piston pipe; the end of each piston rod is fixedly connected to the end of the corresponding second link.

[0009] Further, fixed wheels are provided on both sides of the mobile platform and are clamped with the guide rail, and the mobile platform is slidably disposed on the guide rail.

[0010] Further, the guide rail is connected to the adjustment joint.

[0011] Further, a fixed pad that abuts against the side wall of the guide rail is provided at the end of the fourth link.

[0012] The present application also discloses an extensometer assembly, including: an extensometer body fixedly connected to the front of the extensometer sending and returning device; a contact rod disposed on the extensometer body.

[0013] The present application also discloses a high-temperature strain measurement device, including: a box body, the extensometer assembly is located on one side outside the box body; a loading test device disposed inside the box body and adapted to clamp a specimen; a temperature controller adapted to detect and regulate the temperature inside the box body; the contact rod in the extensometer assembly passes through the box body and abuts against the specimen.

[0014] Further, the loading test device includes: two pull rods hermetically connected to the box body, the top of one of the pull rods passes through the top of the box body, and the bottom of the other pull rod; a specimen clamp is disposed between the two pull rods.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The high-temperature strain measurement device disclosed in the present invention is equipped with an extensometer sending and returning device, which can slide the extensometer assembly on the guide rail according to requirements; the extensometer sending and returning device is equipped with a servo motor and a moving wheel, and the servo motor can be controlled to drive the moving wheel to slide on the longitudinal slide rail; when the extensometer strain reaches the maximum value and the temperature exceeds the safe range, the extensometer sending and returning device will release the fixation according to the sensor signal and drive the servo motor to reverse to drive the extensometer to separate from the loading test device and send it back to the starting point in the reverse direction, thereby playing a role in protecting the contact rod of the extensometer; the extensometer sending and returning device is equipped with a gear pump, and through the transmission of the link assembly, the mobile platform together with the extensometer body is fixed on the guide rail.

[0017] 2. The box body in the present invention adopts a design with a side opening and closing form, which is convenient for the loading and unloading of larger fixtures. By using the box body to provide a safe and reliable extreme test environment, it is possible to conduct long-term mechanical property tests on specimens in high-temperature environments and corrosive solution environments; a docking plate is provided at the recess of the box body for the contact rod in the extensometer assembly to pass through the box body and contact the surface contact groove of the specimen; and a follow-up gasket is installed in the docking plate hole. The follow-up gasket can move with the extensometer contact rod during the deformation of the specimen, effectively preventing the medium in the box body from overflowing and the temperature from dissipating while realizing strain measurement.

[0018] 3. The present invention is provided with a temperature controller. When the temperature of the specimen is too high, the extensometer return device is automatically returned by the sensor signal, and the extensometer assembly is sent back to the starting point in the reverse direction to protect the extensometer assembly in a high-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 Schematic diagram of the fully assembled state of the high-temperature strain measurement device.

[0021] Figure 2 It is a schematic diagram of the complete assembly of the box body;

[0022] Figure 3 It is a detailed structure diagram of the extensometer assembly;

[0023] Figure 4 It is a simplified structure diagram of the extensometer assembly;

[0024] Figure 5 It is a detailed structure diagram of the extensometer return device. DETAILED DESCRIPTION OF THE INVENTION

[0025] Now, the present invention will be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0026] The present invention provides a mechanical property test device for adjustable temperature and with an automatic extensometer return function in extreme environments, aiming to effectively solve the mechanical property test work in high-temperature and corrosive environments.

[0027] Figure 1 It is a diagram of the high-temperature strain measurement device in the present invention; it specifically includes a box body 1 for environmental test sealing, an extensometer assembly 2, a loading test device 3, a computer 4, and a temperature controller 5.

[0028] The box body 1 is used to simulate various complex environments including high temperature, corrosion, etc.; the box body 1 is made of transparent material and will not chemically react with the medium that may be filled inside; the extensometer assembly 2 includes two contact rods 211, an extensometer body 212 and an extensometer sending and returning device 22; the extensometer sending and returning device 22 has a guide rail 23, an angle adjustment joint 24, and a horizontal adjustment joint 25; the horizontal adjustment joint 25 is connected and fixed to the bracket installed on the universal mechanical testing machine, so that the guide rail 23 can be adjusted to be horizontally located on one side of the box body 1 through the bracket of the universal mechanical testing machine, and the two contact rods 211 are arranged vertically.

[0029] The loading test device 3 includes upper and lower pull rods, and a specimen fixture 31 for clamping the specimen is between the two pull rods. The loading test device 3 is installed inside the box body 1. There is a good seal for the fluid at the contact between the pull rod and the box body 1, and it is allowed to move up and down to meet the tensile load application; the loading test device 3 leaves a certain margin at both the upper and lower ends inside the box body 1 to meet the displacement change caused by the tensile load application; the temperature controller 5 includes a cooling module, a display screen, and a sensor, which are used to monitor and control the temperature of the specimen during the test; the computer 4 is used to control the tensile device to perform mechanical property tests on the specimen, collect extensometer data, and control the extensometer sending and returning device.

[0030] Figure 2 It is a schematic diagram of the complete assembly of the box body; it specifically includes a box body outer shell one 11, a box body outer shell two 12, a spring buckle 101, a pressure gauge 102, a hinge 103, a radiator 104, a coolant pipeline 105, an insulating sealing ring 106, an outer shell sealing ring 107, a docking disc 108, a follow-up sealing gasket 109, a gas transmission hole 1001, a liquid transmission hole 1002, and an electrode head 1003.

[0031] On the housing shell 11 of the box body, there are bosses corresponding to the housing sealing rings distributed at the edge of the shell, and an insulating sealing ring 106 is left at the position in contact with the loading test device 3. There are two groups of liquid delivery holes 1002, one above the other, arranged on the box body 1, and a coolant pipeline 105 is arranged at the lower end, which is connected to the radiator 104 outside through the box body 1; on the housing shell two of the box body, i.e., the shell 12, there are housing sealing rings 107 for sealing distributed at the edge, and an insulating sealing ring 106 is left at the position in contact with the test device 3. There are two thicker gas delivery holes 1001, one above the other, arranged on the box body 1, and both holes can be used for the inlet and outlet of gas; spring latches 101 are arranged on the two box bodies 1 for closing and sealing the box body 1; the pressure gauge position 102 is above the housing shell one 11 of the box body, and there is an opening below for observing the air pressure inside the box body 1 in real time; hinges 103 are used to connect the two box bodies 1 and allow them to open at a certain angle; radiators 104 are all arranged below the box body 1, and built-in cooling fans are used to discharge the excess heat inside the box body 1; the coolant pipeline 105 is made of a metal with excellent thermal conductivity, and the coolant inside conducts heat to the radiator 104; there are two pairs of insulating sealing rings 106, one above and one below, for further sealing the connection between the pull rod of the composite loading test device 3 and the box body; the housing sealing ring 107 is placed in the groove at the edge of the housing shell two 12 of the box body for closing with the boss on the housing shell one 11 of the box body; the docking disc 108 is set at the recess of the housing shell one 11 and the housing shell two 12 of the box body, and can be rotated and adjusted in angle according to the position of the contact rod 211; there are two follow-up sealing gaskets 109 set in the corresponding holes of the docking disc 108, which can just accommodate the contact rod 211 and can move a small distance in the vertical direction following the contact rod 211.

[0032] Figure 3 It is a detailed drawing of the extensometer combined structure; it specifically includes an extensometer body 212, a contact rod 211, an extensometer sending and returning device 22, a guide rail 23, an angle adjustment joint 24, and a horizontal adjustment joint 25. The extensometer sending and returning device 22 is connected to the extensometer body 212 and installed on the guide rail 23. The extensometer sending and returning device 22 slides on the guide rail 23 and is adjusted to a suitable position so that the contact rod 211 can be docked with the contact groove on the surface of the specimen; the angle adjustment joint 24 and the horizontal adjustment joint 2 are combined and installed for adjusting the relative position of the extensometer combination and the box body 1; the extensometer combination includes a contact rod 211 and an extensometer main body 21. The contact rod 211 passes through the docking disc circle 108 of the box body 1 and contacts the contact groove on the surface of the specimen. When the specimen deforms during the test, the gauge length between the contact rods 211 also starts to change, and the component deforms. The extensometer main body 21 deforms accordingly and converts this deformation into a change in resistance. The output small signal is amplified by an amplifier, and finally the amplified signal is automatically recorded by a recorder.

[0033] Figure 4This is a simplified diagram of the extensometer combination structure. The extensometer combination structure is simplified into a contact rod 211, an extensometer body 212, an extensometer sending and returning device 22, a guide rail 23, and an angle adjustment joint 24. There are two contact rods 211 in total. To connect with the extensometer body 212, they extend from the extensometer body 212 and contact the corresponding grooves on the specimen; the extensometer body 212 has good measurement accuracy.

[0034] Figure 5 This is a detailed structure diagram of the extensometer sending and returning device 22; it specifically includes a motorized platform 2201, a steering gear 2202, a moving wheel 2203, a fixed wheel 2204, a gear pump 2205, an external meshing gear 22051, an oil storage rod 22052, an oil storage pipe 2206, a piston rod 2207, a second connecting rod 2208, a first connecting rod 2209, a fourth connecting rod 2210, a fixed pad 2211, a third connecting rod 2212, and a docking bolt 2213. The extensometer sending and returning device 22 is connected to the motorized platform 2201 through the docking bolt 2213 with the extensometer body 21, and the moving wheel 2203 is driven by controlling the steering gear 2202 to move on the 23 guide rail; the extensometer sending and returning device 22 is fixed after moving on the guide rail 23 through a hydraulic system; the external meshing gear 22051 is installed inside the gear pump 2205, and the operation of the entire hydraulic system is controlled by controlling the external meshing gear 22051; each connecting rod is connected by bolts to form a connecting rod mechanism, where the gear pump 2205 drives the piston rod 2207 as the driving part, and the other connecting rods are driven parts; by controlling the discharge of hydraulic oil in the gear pump 2205 and the entry of hydraulic oil in the oil storage pipe 2206, the piston rod 2207 contracts, the second connecting rod 2208 moves inward, the fourth connecting rod 2210 moves outward, and the extensometer sending and returning device 22 is not fixed on the guide rail 23, and the moving wheel 2203 can be controlled to move on the guide rail; conversely, when the gear pump 2205 rotates in reverse, the extensometer sending and returning device 22 is fixed on the guide rail 23; the fixed pad 2211 is installed at one end of the fourth connecting rod 2210 to play a role in fixing and anti-slip.

[0035] Figure 1The temperature controller 5 therein consists of key components such as a display screen, temperature adjustment buttons, and alarm indicator lights; the temperature adjustment buttons are responsible for precisely adjusting the temperature of the specimen during the test to ensure that the specimen operates stably within the set temperature range. Through the display screen, the temperature change is displayed in real time to visually monitor the temperature situation. When adjusting the temperature adjustment buttons, the cooling module in the box is controlled in real time, thereby achieving the control of the temperature in the box environment. The temperature control system not only supports real-time adjustment and monitoring of the temperature, but also can provide a stable test environment under different experimental conditions. When the temperature of the specimen is too high, the extensometer body 212 is automatically sent back by driving through the sensor signal, and the contact rod 211 is sent back to the starting point in the reverse direction to protect the extensometer body 212 in extreme environments. This temperature control system can prevent interference with the experimental results caused by temperature fluctuations and ensure the accuracy and repeatability of the experimental data.

[0036] The embodiments of this application have the following advantages:

[0037] 1. Provide an experimental platform for mechanical property testing under extreme test environments such as high temperature and corrosion;

[0038] 2. Achieve real-time adjustment and monitoring of the temperature, and can also provide a stable environment under different experimental conditions;

[0039] 3. Through the extensometer return device 22, an intelligent extensometer body protection mechanism and an automatic loading and unloading function are realized, reducing the errors caused by manual operation and improving the safety and reliability of the experiment.

[0040] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An extensometer return device, characterized in that, Comprising: Guide rail; Motorized platform, which is slidably arranged on the guide rail; Drive assembly, which is adapted to drive the motorized platform to perform linear motion along the guide rail; Pump body assembly, which is arranged on the motorized platform; Two first connecting rods, which are respectively located on both sides of the motorized platform, and a stroke hole is opened at one end of the top thereof; Second connecting rod, one end of which is connected to the output end of the pump body assembly, and the other end is connected to the stroke hole; Third connecting rod, one end of which is hinged to the corresponding side of the motorized platform, and the other end is hinged to the middle of the corresponding first connecting rod; Fourth connecting rod, one end of which is hinged to the bottom of the corresponding second connecting rod, and the other end is adapted to abut against the guide rail.

2. The extensometer return device according to claim 1, characterized in that, The drive assembly includes: Servo motor, which is arranged at the tail of the motorized platform; Moving wheel, which is rotatably arranged at the tail of the motorized platform and generates friction between the guide rails, and the rotation of the moving wheel is controlled by the servo motor.

3. The extensometer sending and returning device according to claim 1, wherein The pump body assembly includes: Gear pump, which is arranged on the motorized platform, a fuel storage pipe is arranged on one side thereof, a fuel storage rod is arranged in the fuel storage pipe, a piston pipe is arranged on the other side of the gear pump, and piston rods are arranged on both sides of the piston pipe; The end of each piston rod is fixedly connected to the end of the corresponding second connecting rod.

4. The extensometer return device according to claim 1, characterized in that, Fixed wheels are arranged on both sides of the motorized platform and are clamped with the guide rail to slidably arrange the motorized platform on the guide rail.

5. The extensometer return device according to claim 1, characterized in that, The guide rail is connected to the adjustment joint.

6. The extensometer return device according to claim 1, characterized in that, A fixed pad for abutting against the side wall of the guide rail is arranged at the end of the fourth connecting rod.

7. An extensometer assembly, comprising the extensometer sending and returning device according to any one of claims 1-6, characterized in that, Comprising: Extensometer body, which is fixedly connected to the front of the extensometer sending and returning device; Contact rod, which is arranged on the extensometer body.

8. A high-temperature strain measurement device, comprising the extensometer combination according to claim 7, characterized in that, Comprising: Box body, and the extensometer assembly is located on one side outside the box body; Loading test device, which is arranged in the box body and is adapted to clamp the specimen; Temperature controller, which is adapted to detect and regulate the temperature in the box body; In the extensometer assembly, the contact rod passes through the box body and abuts against the specimen.

9. The high-temperature strain measurement device according to claim 8, characterized in that, The loading test device includes: Two pull rods hermetically connected to the box body, the top of one of the pull rods passes through the top of the box body, and the bottom of the other pull rod; A specimen clamp is arranged between the two pull rods.

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