Automatic thermal extension testing machine

Abstract

The invention relates to the field of detection equipment, in particular to an automatic thermal extension testing machine which comprises an aging box body, a limiting device and a measuring assembly, the limiting device is connected to the inner wall of the aging box body and can clamp and suspend a sample, an inner cavity of the aging box body can heat the sample, and the measuring assembly comprises a measuring scale, a camera and a computer. The measuring scale is connected to the inner wall of the aging box body, a zero graduation line of the measuring scale is aligned with the end part of the sample on the limiting device, the camera is connected to the inner wall of the aging box body facing the sample, and the camera is electrically connected with the camera and shoots a picture of the sample and transmits the picture to the computer. The measuring scale, the camera and the computer are arranged, the computer reads the distance of the sample on the measuring scale in a picture, automatic measurement of the size of the sample is achieved, the elongation of the sample under the high-temperature condition is calculated according to a formula, automatic thermal extension detection of the sample is achieved, workers do not need to manually measure the length of the sample, and the working efficiency is improved. Therefore, the detection precision of the cable is improved.

Description

Technical Field

[0001] The present application relates to the field of testing equipment, and in particular to an automatic thermal extension testing machine. Background Art

[0002] Thermal elongation testing is an analytical method for evaluating the expansion characteristics and ductility of materials under heating conditions. It is mainly used to understand the thermal stability of materials, design heat treatment processes, develop new materials, and verify material quality, thereby ensuring the stability and reliability of products in actual applications.

[0003] During the test of the cable thermal extension test device in the prior art, the staff needs to use a measuring ruler to measure the extension length of the cable after heating, so as to examine the degree of cross-linking of the cable; however, when the staff aligns the zero scale line of the measuring ruler with the end of the cable, it is easy to cool down and shrink, thereby reducing the detection accuracy of the cable. Summary of the invention

[0004] In order to improve the problem of detection accuracy of cables, the present application provides an automatic thermal extension testing machine.

[0005] The present application provides an automatic thermal extension testing machine, which adopts the following technical solution: An automatic thermal extension testing machine comprises an aging box, a limit device and a measuring component, wherein the limit device is connected to the inner wall of the aging box, the limit device can clamp the sample for hanging, the inner cavity of the aging box can heat the sample, the measuring component comprises a ruler, a camera and a computer, the ruler is connected to the inner wall of the aging box, the zero scale line of the ruler is aligned with the end of the sample on the limit device, the camera is connected to the inner wall of the aging box facing the sample, the camera is electrically connected to the camera, and the camera takes pictures of the sample and transmits them to the computer.

[0006] By adopting the above technical solution, when the sample is subjected to the hot extension test, the staff installs the end of the sample on the limit device, the sample is suspended in the inner cavity of the aging box, the end of the sample is aligned with the zero scale line of the ruler, and the inner cavity of the aging box heats the sample; at the same time, the camera is installed on the inner wall of the aging box facing the sample, the camera takes a real-time photo of the sample in the aging box, and sends the photo to the computer. The computer reads the distance of the sample on the ruler in the photo, realizes the automatic measurement of the sample size, and calculates the elongation of the sample under high temperature conditions according to the formula, realizes the automatic hot extension detection of the sample, and does not need the staff to manually measure the length of the sample, thereby improving the detection accuracy of the cable.

[0007] Optionally, the limit device includes a limit frame and multiple positioning components, the limit frame is connected to the inner wall of the aging box, and the multiple positioning components are connected to the surface of the limit frame at intervals. The positioning component includes a positioning piston, a clamping plate and an elastic member. The surface of the limit frame is provided with a positioning cavity for the sliding of the positioning piston. The sliding direction of the positioning piston and the height direction of the aging box are parallel to each other. The end of the positioning piston protruding from the limit frame can abut the end of the sample. The clamping plate is slidably connected to the surface of the limit frame. The sliding direction of the clamping plate and the height direction of the positioning piston are parallel to each other. The sliding directions are perpendicular to each other, one end of the elastic member in the elastic direction is connected to the surface of the limit frame, and the other end of the elastic member in the elastic direction is connected to the surface of the clamping plate. The elastic member has an elastic force that drives the clamping plate to slide in the direction close to the positioning piston, and the end of the clamping plate tends to press against the end of the positioning piston. When the end of the sample presses against the surface of the positioning piston and drives the positioning piston to slide in the direction close to the positioning cavity, the end of the positioning piston is flush with the surface of the limit frame, and the clamping plate surface and the surface of the limit frame clamp the two sides of the sample end to form a limit.

[0008] By adopting the above technical solution, the staff makes the end of the sample abut against the end of the positioning piston protruding from the limit frame, and drives the positioning piston to slide in the direction close to the positioning cavity. The end of the positioning piston is flush with the surface of the limit frame, and the clamping force between the positioning piston and the clamping plate disappears. The elastic force of the elastic member drives the clamping plate to slide in the direction close to the sample. The clamping plate surface and the limit frame surface clamp the two sides of the end of the sample to form a limit, so that the limit device can synchronously clamp samples of different sizes, thereby improving the versatility of the automatic thermal extension testing machine.

[0009] Optionally, the positioning assembly also includes a reset piston and an elastic member 2, the surface of the limit frame is provided with a reset cavity for the reset piston to slide, the sliding direction of the reset piston and the sliding direction of the clamping plate are parallel to each other, the reset cavity is connected to the positioning cavity, one end of the elastic member 2 in the elastic force direction is connected to the inner wall of the reset cavity, and the other end of the elastic member 2 in the elastic force direction is connected to the surface of the reset piston, the elastic member 2 has an elastic force to drive the reset piston to slide in the direction close to the reset cavity, the end face of the reset piston is flush with the surface of the limit frame, and the end of the positioning piston tends to protrude from the surface of the limit frame.

[0010] By adopting the above technical solution, the elastic force of the second elastic member drives the reset piston to slide in the direction close to the reset cavity, the end face of the reset piston is flush with the surface of the limit frame, and the end of the positioning piston protrudes from the surface of the limit frame; when the end of the sample abuts against the end face of the positioning piston and drives the positioning piston to slide in the direction close to the positioning cavity, the end face of the positioning piston is flush with the surface of the limit frame, the positioning cavity is connected to the reset cavity, the air in the positioning cavity enters the reset cavity and squeezes the reset piston, driving the reset piston to slide in the direction away from the reset cavity, and the end of the reset piston protrudes from the surface of the limit frame, so that the staff can directly The position of the sample and the positioning piston is then observed; when the sample is taken out after the thermal extension test, the clamping plate is driven to slide in the direction away from the positioning cavity, the abutment effect between the clamping plate surface and the end face of the positioning piston disappears, and the elastic force of the elastic member drives the reset piston to slide in the direction close to the reset cavity, the end face of the reset piston is flush with the surface of the limit frame, the air in the reset cavity enters the positioning cavity, the air pressure in the positioning cavity squeezes the positioning piston, driving the positioning piston to slide in the direction away from the positioning cavity, and the end of the positioning piston protrudes from the surface of the limit frame, thereby realizing automatic reset of the positioning piston.

[0011] Optionally, the positioning assembly also includes a clamping rod, and a clamping cavity for sliding of the clamping rod is formed on the surface of the limit frame facing the reset piston, the sliding direction of the clamping rod and the sliding direction of the positioning piston are parallel to each other, the depth direction of the clamping cavity passes through the outer wall of the limit frame and faces the clamping plate surface, the clamping plate surface is provided with a guide arc groove for sliding of the end of the clamping rod, and the surface of the reset piston facing the clamping rod is provided with a clamping groove for embedding the end of the clamping rod, when the clamping plate slides toward the direction close to the sample, the inner wall of the guide arc groove guides the clamping rod to slide toward the direction close to the clamping groove, and the end of the clamping rod is embedded in the clamping groove to form a limit.

[0012] By adopting the above technical solution, when the positioning piston slides toward the direction close to the positioning cavity and the end of the reset piston protrudes from the surface of the limit frame, the notch of the clamping groove faces the surface of the clamping rod, and the clamping effect between the clamping plate and the surface of the positioning piston disappears. The elastic force of the elastic member drives the clamping plate to slide toward the direction close to the sample, driving the inner wall of the guide arc groove to guide the clamping rod to slide toward the direction close to the clamping groove. One end of the clamping rod is located in the clamping cavity, and the other end of the clamping rod is located in the clamping groove, so that the reset piston is not easy to deviate in the reset cavity, thereby improving the limiting stability of the reset piston in the reset cavity.

[0013] Optionally, the clamping plate includes an airbag portion and a sliding portion, the sliding portion is slidably connected to the surface of the limit frame, the elastic member is connected to the surface of the sliding portion, the airbag portion is connected to the surface of the sliding portion facing the positioning piston, and the surface of the airbag portion and the surface of the limit frame can press against both sides of the sample end to form a limit.

[0014] By adopting the above technical solution, when the end of the positioning piston is flush with the surface of the limit frame, the pressing effect between the end face of the airbag part and the positioning piston disappears, and the elastic force of the elastic member drives the sliding part to slide in the direction close to the sample. The surface of the airbag part and the surface of the limit frame clamp the two sides of the end of the sample to form a limit. The airbag part converts part of the pressure of the sample into elastic force, reducing the wear between the airbag part and the sample, thereby extending the service life of the automatic thermal extension testing machine.

[0015] Optionally, the sliding part is connected to a tensioning component, which includes a thermal expansion and contraction strip and a starting piston, a deformation cavity for accommodating the thermal expansion and contraction strip being provided on the surface of the sliding part, the deformation cavity being connected to the inner cavity of the airbag part, the starting piston being slidably connected to the inner wall of the deformation cavity, the sliding direction of the starting piston and the sliding direction of the positioning piston being parallel to each other, the starting piston dividing the deformation cavity into deformation segment one and deformation segment two, the thermal expansion and contraction strip being located in the deformation segment one, the inner cavity of the airbag part being connected to the deformation segment two, a connecting flow channel one being provided on the surface of the starting piston facing the deformation segment one, and a connecting flow channel two being provided on the surface of the starting piston facing the deformation segment two, when the thermal expansion and contraction strip heats up and expands, the starting piston is driven to slide in a direction close to the deformation segment two, and the deformation segment one, the connecting flow channel one, the connecting flow channel two, the deformation segment two and the inner cavity of the airbag part are connected.

[0016] By adopting the above technical scheme, when the aging box heats the sample, the thermal expansion and contraction strips heat up and expand, the air pressure in the deformation segment one increases, and the air pressure in the deformation segment one drives the starting piston to slide in the direction close to the deformation segment two. The deformation segment one, the connecting flow channel one, the connecting flow channel two, the deformation segment two and the inner cavity of the airbag part are connected in sequence, and the air in the deformation segment one passes through the connecting flow channel one, the connecting flow channel two and the deformation segment two in sequence and enters the inner cavity of the airbag part. The surface of the airbag part is pressurized and expanded and pressed against the surface of the sample to form a limit, so that the sample is not easy to separate from the limit component, thereby improving the limit stability of the limit component on the sample.

[0017] Optionally, the sliding part is connected to a warning component, which includes a contact switch 1 and a warning light. The contact switch 1 is connected to the inner wall of the deformation segment 2, and the warning light is connected to the surface of the sliding part. The warning light is electrically connected to the contact switch 1. When the starting piston slides toward the direction close to the deformation segment 2, the contact switch 1 abuts against the starting piston and is turned on, and the warning light is energized and illuminates.

[0018] By adopting the above technical solution, when the thermal expansion and contraction block heats up and expands, the air pressure in the deformation section one increases, and the air pressure in the deformation section one drives the starting piston to slide in the direction close to the deformation section two. The contact switch one abuts against the starting piston and is turned on, and the warning light is energized and illuminated, thereby warning the staff not to touch the sliding part, reducing the possibility of the staff being scalded, thereby improving the safety of the use of the automatic thermal extension testing machine.

[0019] Optionally, the warning component also includes connecting rod 1 and connecting rod 2, one end of connecting rod 1 is rotatably connected to the surface of the limit frame, the other end of connecting rod 1 is rotatably connected to the end of connecting rod 2, and the other end of connecting rod 2 is rotatably connected to the surface of the sliding part.

[0020] By adopting the above technical solution, one end of connecting rod one rotates on the surface of the limit frame, the other end of connecting rod one is rotationally connected to the end of connecting rod two, and the other end of connecting rod two rotates on the surface of the sliding part. When it is necessary to unload the sample, connecting rod one and connecting rod two are driven to rotate in directions away from each other, driving the sliding part to slide in a direction away from the sample, so that the clamping effect of the sliding part on the sample disappears. Connecting rod one and connecting rod two provide force points for users, thereby facilitating the control of the sliding of the sliding part.

[0021] Optionally, the aging box is connected to a power assembly, which includes a power motor and a power screw. The power motor is connected to the inner wall of the aging box, the end of the power screw is coaxially connected to the motor shaft of the power motor, and the limit frame is threadedly connected to the outer wall of the power screw. The limit frame can slide along the axis of the power screw toward the direction close to the door of the aging box.

[0022] By adopting the above technical solution, when it is necessary to load the specimens, the power motor drives the power screw to rotate, driving the limit frame to slide along the axis of the power screw toward the door of the aging box, so that the limit frame is close to the opening of the aging box, thereby facilitating the staff to install the specimens one by one on the limit assembly, thereby improving the installation efficiency of the specimens.

[0023] Optionally, the power assembly includes a connecting rod three, a sliding plate and a contact switch two. The inner wall of the aging box is provided with a sliding cavity for the sliding plate to slide. The sliding direction of the sliding plate and the axis of the power screw are parallel to each other. One end of the connecting rod three is rotatably connected to the sliding plate surface, and the other end of the connecting rod three is rotatably connected to the aging box cabinet door. The contact switch two is connected to the bottom wall of the sliding cavity. The contact switch two is electrically connected to the power motor. When the aging box cabinet door rotates in the direction away from the limit frame, the connecting rod three rotates to drive the sliding plate to slide in the direction close to the contact switch two. The contact switch two abuts the sliding plate and is turned on, and the power motor is energized and runs.

[0024] By adopting the above technical solution, when the cabinet door of the aging box is driven to rotate in the direction away from the limit frame, the connecting rod three rotates, driving the sliding plate to slide in the direction close to the contact switch two, the contact switch two abuts the sliding plate and is turned on, the power motor is energized and allowed to drive the limit frame to slide along the axis of the power screw rod in the direction close to the opening of the aging box, thereby realizing the directional start of the sliding of the limit frame.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of ruler, camera and computer. The computer reads the distance between the sample and the ruler in the photo to realize the automatic measurement of the sample size, and calculates the elongation of the sample under high temperature conditions according to the formula to realize the automatic thermal extension test of the sample. There is no need for staff to measure the length of the sample manually, thereby improving the detection accuracy of the cable; 2. The positioning piston, clamping plate and elastic member are arranged so that the clamping plate surface and the limit frame surface clamp the two sides of the sample end to form a limit, so that the limit device can clamp samples of different sizes synchronously, thereby improving the versatility of the automatic thermal extension testing machine; 3. The setting of the reset piston and the second elastic member drives the reset piston to slide in the direction away from the reset chamber, and the end of the reset piston protrudes from the surface of the limit frame, so that the staff can directly observe the position of the sample and the positioning piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the local structure in an embodiment of the present application, mainly showing the power components.

[0028] Figure 3 It is a partial cross-sectional view in an embodiment of the present application, mainly showing the positioning component.

[0029] Figure 4 It is a schematic diagram of the local structure in the embodiment of the present application, mainly showing connecting rod one and connecting rod two.

[0030] Figure 5 It is a partial cross-sectional view in the embodiment of the present application, mainly showing contact switch 2.

[0031] Description of reference numerals: 1, aging box; 11, sliding cavity; 2, limiting device; 21, limiting frame; 211, positioning cavity; 212, reset cavity; 213, clamping cavity; 214, pressing cavity; 22, positioning assembly; 221, positioning piston; 222, clamping plate; 2221, airbag part; 2222, sliding part; 2223, guide arc groove; 2224, deformation cavity; 2225, deformation segment 1; 2226, deformation segment 2; 223, elastic member 1; 224, elastic member 2; 225, reset piston; 2251 , tightening groove; 226, tightening rod; 2261, tightening part; 2262, roller; 3, measuring component; 31, ruler; 32, camera; 4, sample; 5, tensioning component; 51, thermal expansion and contraction strip; 52, starting piston; 521, connecting flow channel one; 522, connecting flow channel two; 6, warning component; 61, contact switch one; 62, warning light; 63, connecting rod one; 64, connecting rod two; 7, power component; 71, power motor; 72, power screw; 73, connecting rod three; 74, sliding plate; 75, contact switch two. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The present application embodiment discloses an automatic thermal extension testing machine. Figure 1 and Figure 2 An automatic thermal extension testing machine includes an aging box 1, a limit device 2 and a measuring component 3. The bottom of the aging box 1 abuts against the ground to form a support. The limit device 2 is installed on the inner wall of the aging box 1. The limit device 2 can clamp a sample 4 and suspend it in the inner cavity of the aging box 1. The inner cavity of the aging box 1 heats the suspended sample 4. The measuring component 3 is installed on the aging box 1. The measuring component 3 can shoot the suspended sample 4, measure the extension height of the sample 4 and calculate the elongation of the sample 4. There is no need for staff to manually measure the length of the sample 4, thereby improving the detection accuracy of the cable.

[0034] Reference Figure 1 and Figure 2 The measuring assembly 3 includes a ruler 31, a camera 32 and a computer. The ruler 31 is fixed to the inner wall of the aging box 1 by bolts. The zero scale line of the ruler 31 is aligned with the end of the sample 4 on the limit device 2. The camera 32 is fixed to the surface of the cabinet door of the aging box 1 facing the ruler 31 by bolts. The camera 32 is electrically connected to the computer. The camera 32 is used to take a photo of the sample 4 on the ruler 31 and send it to the computer. The computer reads the height of the sample 4 in the photo and calculates the elongation of the sample 4, thereby realizing the automatic thermal extension detection of the sample 4.

[0035] Reference Figure 2 and Figure 3The limiting device 2 includes a limiting frame 21 and a plurality of positioning components 22. The limiting frame 21 is slidably connected to the inner wall of the aging box 1. The sliding direction of the limiting frame 21 and the width direction of the aging box 1 are parallel to each other. The plurality of positioning components 22 are installed at intervals on the surface of the limiting frame 21. The arrangement direction of the positioning components 22 and the length direction of the limiting frame 21 are parallel to each other. The positioning components 22 can clamp the end of the sample 4 and limit it on the limiting frame 21, so that the sample 4 is not easy to leave the limiting frame 21, thereby improving the limiting stability of the sample 4 on the limiting frame 21.

[0036] Reference Figure 2 and Figure 3 The positioning assembly 22 includes a positioning piston 221, a clamping plate 222, an elastic member 1 223, a reset piston 225, an elastic member 224 and a clamping rod 226. The materials of the positioning piston 221 and the reset piston 225 can be rubber or silicone. In the embodiment of the present application, the material of the positioning piston 221 and the reset piston 225 is rubber, which has a certain deformation ability. A positioning cavity 211 for the sliding movement of the positioning piston 221 is provided on the surface of the limit frame 21. The sliding direction of the positioning piston 221 is parallel to the height direction of the aging box 1. The end of the positioning piston 221 protruding from the surface of the limit frame 21 can abut against the end of the sample 4, and the limit frame 21 faces the aging box 1. A reset chamber 212 for the reset piston 225 to slide is provided on the surface of the cabinet door of the chemical box body 1. The sliding direction of the reset piston 225 and the sliding direction of the limit frame 21 are parallel to each other. The elastic member 224 can be a compression spring or a tension spring. In the embodiment of the present application, the elastic member 224 is a compression spring with a certain deformation ability. One end of the elastic member 224 in the elastic direction is connected to the bottom wall of the reset chamber 212, and the other end of the elastic member 224 in the elastic direction is connected to the surface of the reset piston 225. The elastic member 224 has the elastic force to drive the reset piston 225 to slide in the direction close to the reset chamber 212, and the end of the positioning piston 221 tends to protrude from the surface of the limit frame 21.

[0037] Reference Figure 2 and Figure 3The clamping plate 222 includes an airbag portion 2221 and a sliding portion 2222. The material of the airbag portion 2221 can be rubber or silicone. In the embodiment of the present application, the material of the airbag portion 2221 is rubber, which has a certain deformation ability. The airbag portion 2221 is fixed to the end surface of the sliding portion 2222. The surface of the limiting frame 21 is provided with a clamping cavity 213 for the sliding portion 2222 to slide. The clamping cavity 213 is connected to the positioning cavity 211. The sliding direction of the sliding portion 2222 and the sliding direction of the reset piston 225 are parallel to each other, and the airbag portion 22 21 surface faces the surface of the positioning piston 221; the elastic member 223 can be a compression spring or a tension spring. In the embodiment of the present application, the elastic member 223 is a compression spring with a certain deformation ability. One end of the elastic member 223 in the elastic direction is connected to the bottom wall of the clamping cavity 213, and the other end of the elastic member 223 in the elastic direction is connected to the surface of the sliding portion 2222. The elastic member 223 has an elastic force that drives the sliding portion 2222 to slide in the direction close to the positioning piston 221, and the surface of the airbag portion 2221 tends to progressively approach the surface of the positioning piston 221.

[0038] Reference Figure 2 and Figure 3 The clamping rod 226 includes a clamping portion 2261 and a roller 2262, the roller 2262 is rotatably connected to the end of the clamping portion 2261, the axis of the roller 2262 is parallel to the length direction of the aging box 1, and a clamping cavity 214 for the clamping portion 2261 to slide is provided on the surface of the limit frame 21 facing the reset piston 225, the sliding direction of the clamping portion 2261 and the sliding direction of the positioning piston 221 are parallel to each other, the clamping cavity 214 penetrates the outer wall of the limit frame 21 in the depth direction and is connected to the clamping cavity 213, the wheel surface of the roller 2262 is in rolling contact with the surface of the sliding portion 2222, the surface of the sliding portion 2222 facing the clamping cavity 214 is provided with a guide arc groove 2223, the inner wall of the guide arc groove 2223 is in an arc shape, and the surface of the reset piston 225 facing the clamping rod 226 is provided with a clamping groove 2251 for the end of the clamping portion 2261 to be embedded.

[0039] Reference Figure 2 and Figure 3When the end of the sample 4 abuts against the end of the positioning piston 221 and drives the positioning piston 221 to slide in the direction close to the positioning cavity 211, the end of the positioning piston 221 is flush with the surface of the limiting frame 21, and the pressing force between the airbag part 2221 and the positioning piston 221 disappears. The elastic force of the elastic member 223 drives the sliding part 2222 to slide along the inner wall of the clamping cavity 213 in the direction close to the sample 4. The surface of the airbag part 2221 and the surface of the limiting frame 21 clamp the two sides of the end of the sample 4 to form a limit, so that the sample 4 is fixed on the limiting frame 21; at the same time, the air in the positioning cavity 211 enters the reset cavity 212, and the air pressure in the reset cavity 212 drives the reset piston 225 It slides in the direction away from the reset chamber 212, and the end of the reset piston 225 protrudes from the surface of the limit frame 21, and the notch of the tightening groove 2251 faces the tightening portion 2261, the inner wall of the guide arc groove 2223 rolls with the wheel surface of the roller 2262, and guides the tightening portion 2261 to slide in the direction close to the tightening groove 2251, the end of the tightening portion 2261 is embedded in the tightening groove 2251, one end of the tightening portion 2261 is embedded in the tightening groove 2251, and the other end of the tightening portion 2261 is located in the tightening chamber 214, so that the reset piston 225 is not easy to deviate in the reset chamber 212, thereby improving the limiting stability of the reset piston 225 in the reset chamber 212.

[0040] Reference Figure 2 and Figure 3 The sliding portion 2222 is provided with a tensioning assembly 5, which can inflate the inner cavity of the airbag portion 2221. The tensioning assembly 5 includes a thermal expansion and contraction strip 51 and a starting piston 52. The thermal expansion and contraction strip 51 can be made of rubber or nylon. In the embodiment of the present application, the material of the thermal expansion and contraction strip 51 is nylon, which has a certain thermal expansion coefficient. A deformation cavity 2224 for accommodating the thermal expansion and contraction strip 51 is provided on the surface of the sliding portion 2222. The deformation cavity 2224 is connected to the inner cavity of the airbag portion 2221. The material of the starting piston 52 can be rubber or silicone. In the embodiment of the present application, the material of the starting piston 52 is rubber, which has a certain deformation capacity. The starting piston 52 is slidably connected to the deformation cavity 2224. The inner wall, the sliding direction of the starting piston 52 and the sliding direction of the positioning piston 221 are parallel to each other, the starting piston 52 separates the deformation cavity 2224 into a deformation segment 1 2225 and a deformation segment 2 2226, the thermal expansion and contraction strip 51 is located in the deformation segment 1 2225, the deformation segment 2 2226 is connected to the inner cavity of the airbag portion 2221, a connecting flow channel 1 521 is provided on the surface of the starting piston 52 facing the deformation segment 1 2225, a connecting flow channel 2 522 is provided on the surface of the starting piston 52 facing the deformation segment 2 2226, the connecting flow channel 1 521 is connected to the connecting flow channel 2 522, the surface of the starting piston 52 presses against the inner wall of the deformation segment 1 2225 and separates the connecting flow channel 2 522 and the deformation segment 2 2226.

[0041] Reference Figure 2 and Figure 3When the inner cavity of the aging box 1 heats the sample 4, the thermal expansion and contraction strip 51 heats up and expands, and the air pressure in the deformation section 1 2225 increases, driving the starting piston 52 to slide in the direction close to the deformation section 2 2226. The sealing effect of the inner wall of the deformation section 1 2225 on the opening of the connecting flow channel 2 522 disappears, and the deformation section 1 2225, the connecting flow channel 1 521, the connecting flow channel 2 522, the deformation section 2 2226 and the inner cavity of the airbag part 2221 are connected in sequence. The air in the deformation section 1 2225 passes through the connecting flow channel, the connecting flow channel 2 522 and the deformation section 2 2226 in sequence and enters the inner cavity of the airbag part 2221. The surface of the airbag part 2221 is pressurized and expanded and pressed against the surface of the sample 4 to form a limit, so that the sample 4 is not easy to leave the limit frame 21, thereby improving the limit stability of the sample 4 on the limit frame 21.

[0042] Reference Figure 3 and Figure 4 The sliding part 2222 is installed with a warning component 6, which can display the temperature of the sliding part 2222. The warning component 6 includes a contact switch 61, a warning light 62, a connecting rod 63 and a connecting rod 64. The contact switch 61 is installed on the inner wall of the deformation section 2226, and the warning light 62 is installed on the surface of the sliding part 2222 by bolts. The contact switch 61 is electrically connected to the warning light 62; one end of the connecting rod 63 is rotatably connected to the surface of the limit frame 21, and the other end of the connecting rod 63 is rotatably connected to the end of the connecting rod 64, and the end of the connecting rod 64 away from the connecting rod 63 is rotatably connected to the surface of the sliding part 2222, and the sample 4 is located between the connecting rod 63 and the connecting rod 64.

[0043] Reference Figure 3 and Figure 4 When the thermal expansion and contraction strip 51 heats up and expands, the start piston 52 is driven to slide toward the direction close to the second deformation section 2226, the contact switch 1 61 abuts against the start piston 52 and is turned on, and the warning light 62 is energized and illuminated, thereby warning the user to stop touching the surface of the sliding portion 2222, reducing the possibility of the user being scalded, thereby improving the safety of the automatic thermal extension testing machine; when the thermal expansion and contraction block cools down and contracts, the air pressure in the first deformation section 2225 decreases, driving the start piston 52 toward the direction close to the second deformation section 2226. The sample 4 slides in the direction of the deformation section 1 2225, the abutment effect between the contact switch 1 61 and the starting piston 52 disappears, the warning light 62 is powered off and stops emitting light, and the user drives the connecting rod 1 63 and the connecting rod 2 64 to rotate away from each other. The connecting rod 1 63 and the connecting rod 2 64 provide force points for the user to drive the sliding part 2222 to slide in the direction away from the sample 4, the pressing force of the airbag part 2221 on the surface of the sample 4 disappears, and the sample 4 is separated from the limit frame 21, thereby realizing automatic unloading of the sample 4.

[0044] Reference Figure 2 and Figure 5The aging box 1 is equipped with a power assembly 7, which can drive the limit frame 21 to slide. The power assembly 7 includes a power motor 71, a power screw rod 72, a connecting rod three 73, a sliding plate 74 and a contact switch two 75. The power motor 71 is fixed to the inner wall of the aging box 1 by bolts. The motor axis of the power motor 71 and the sliding direction of the limit frame 21 are parallel to each other. The end of the power screw rod 72 is coaxially fixed on the motor shaft of the power motor 71. The limit frame 21 is threadedly connected to the outer wall of the power screw rod 72. The limit frame 21 slides along the axis of the power screw rod 72 toward the direction close to the opening of the aging box 1.

[0045] Reference Figure 2 and Figure 5 The inner wall of the aging box 1 is provided with a sliding cavity 11 for sliding the sliding plate 74. The sliding direction of the sliding plate 74 is parallel to the axis of the power screw 72. The contact switch 2 75 is installed on the inner wall of the sliding cavity 11 close to the door of the aging box 1. The contact switch 2 75 is electrically connected to the power motor 71. One end of the connecting rod 3 73 is rotatably connected to the surface of the sliding plate 74, and the other end of the connecting rod 3 73 is rotatably connected to the surface of the door of the aging box 1. When the door of the aging box 1 moves away from the aging box, 1, the connecting rod 3 73 is driven to rotate, driving the sliding plate 74 to slide along the inner wall of the sliding cavity 11 toward the direction close to the contact switch 2 75, the contact switch 2 75 abuts against the sliding plate 74 and is turned on, the power motor 71 is energized and runs, driving the sliding frame to slide along the axis of the power screw 72 toward the direction close to the opening of the aging box 1, and the user does not need to extend the body into the inner cavity of the aging box 1 to install the sample 4, thereby improving the convenience of using the automatic thermal extension testing machine.

[0046] The implementation principle of an automatic thermal extension testing machine in the embodiment of the present application is as follows: when the sample 4 is subjected to the thermal extension test, the cabinet door of the aging box is driven to rotate in the direction away from the aging box 1, driving the connecting rod 3 73 to rotate, driving the sliding plate 74 to slide along the inner wall of the sliding cavity 11 in the direction close to the contact switch 2 75, the contact switch 2 75 abuts against the sliding plate 74 and is turned on, the power motor 71 is energized and runs, driving the sliding frame to slide along the axis of the power screw 72 in the direction close to the opening of the aging box 1, and the user does not need to extend his body into the inner cavity of the aging box 1 to install the sample 4. When the end of the sample 4 abuts against the end of the positioning piston 221 and drives the positioning piston 221 to slide in the direction close to the positioning cavity 211, the end of the positioning piston 221 is flush with the surface of the limit frame 21, and the airbag part 2221 is aligned with the positioning piston 22 1 disappears, and the elastic force of the elastic member 223 drives the sliding portion 2222 to slide along the inner wall of the clamping cavity 213 toward the direction close to the sample 4, and the surface of the airbag portion 2221 and the surface of the limit frame 21 clamp the two sides of the end of the sample 4 to form a limit, so that the sample 4 is fixed on the limit frame 21; the power motor 71 continues to rotate, and the limit frame 21 slides along the axis of the power screw 72 toward the direction close to the ruler 31, and the end of the sample 4 on the limit frame 21 is aligned with the zero scale line of the ruler 31, and the camera 32 takes a photo of the sample 4 on the ruler 31 and sends it to the computer. The computer reads the height of the sample 4 in the photo and calculates the elongation of the sample 4, so as to realize the automatic thermal extension detection of the sample 4, and there is no need for the staff to manually measure the length of the sample 4, thereby improving the detection accuracy of the cable.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic thermal extension testing machine, characterized in that: The invention comprises an aging box (1), a limiting device (2) and a measuring component (3), wherein the limiting device (2) is connected to the inner wall of the aging box (1), the limiting device (2) can clamp a sample (4) for hanging, the inner cavity of the aging box (1) can heat the sample (4), the measuring component (3) comprises a ruler (31), a camera (32) and a computer, the ruler (31) is connected to the inner wall of the aging box (1), the zero scale line of the ruler (31) is aligned with the end of the sample (4) on the limiting device (2), the camera (32) is connected to the inner wall of the aging box (1) facing the sample (4), the camera (32) is electrically connected to the camera (32), and the camera (32) takes a picture of the sample (4) and transmits it to the computer.

2. An automatic thermal extension testing machine according to claim 1, characterized in that: The limiting device (2) comprises a limiting frame (21) and a plurality of positioning components (22); the limiting frame (21) is connected to the inner wall of the aging box (1); the plurality of positioning components (22) are connected to the surface of the limiting frame (21) at intervals; the positioning component (22) comprises a positioning piston (221), a clamping plate (222) and an elastic member (223); a positioning cavity (211) for sliding movement of the positioning piston (221) is provided on the surface of the limiting frame (21); the sliding direction of the positioning piston (221) and the height direction of the aging box (1) are parallel to each other; the end of the positioning piston (221) protruding from the limiting frame (21) can abut against the end of the sample (4); the clamping plate (222) is slidably connected to the surface of the limiting frame (21); the sliding direction of the clamping plate (222) and the positioning piston are parallel to each other. The sliding directions of the two elastic members (221) are perpendicular to each other, one end of the elastic member (223) in the elastic direction is connected to the surface of the limit frame (21), and the other end of the elastic member (223) in the elastic direction is connected to the surface of the clamping plate (222). The elastic member (223) has an elastic force that drives the clamping plate (222) to slide in the direction close to the positioning piston (221), and the end of the clamping plate (222) has a tendency to press against the end of the positioning piston (221). When the end of the sample (4) presses against the surface of the positioning piston (221) and drives the positioning piston (221) to slide in the direction close to the positioning cavity (211), the end of the positioning piston (221) is flush with the surface of the limit frame (21), and the surface of the clamping plate (222) and the surface of the limit frame (21) clamp the two sides of the end of the sample (4) to form a limit.

3. An automatic thermal extension testing machine according to claim 2, characterized in that: The positioning assembly (22) further comprises a reset piston (225) and a second elastic member (224); a reset cavity (212) for the reset piston (225) to slide is provided on the surface of the limiting frame (21); the sliding direction of the reset piston (225) and the sliding direction of the clamping plate (222) are parallel to each other; the reset cavity (212) is connected to the positioning cavity (211); one end of the second elastic member (224) in the elastic force direction is connected to the inner wall of the reset cavity (212); the other end of the second elastic member (224) in the elastic force direction is connected to the surface of the reset piston (225); the second elastic member (224) has an elastic force driving the reset piston (225) to slide in a direction close to the reset cavity (212); the end surface of the reset piston (225) is flush with the surface of the limiting frame (21), and the end of the positioning piston (221) tends to protrude from the surface of the limiting frame (21).

4. The automatic thermal extension testing machine according to claim 3, characterized in that: The positioning assembly (22) further comprises a clamping rod (226); a surface of the limiting frame (21) facing the reset piston (225) is provided with a clamping cavity (214) for the clamping rod (226) to slide; the sliding direction of the clamping rod (226) and the sliding direction of the positioning piston (221) are parallel to each other; the clamping cavity (214) penetrates the outer wall of the limiting frame (21) in the depth direction and faces the surface of the clamping plate (222); the surface of the clamping plate (222) is provided with a clamping cavity (214) for the clamping rod (226) to slide; 6) a guiding arc groove (2223) for sliding at the end, a surface of the reset piston (225) facing the clamping rod (226) is provided with a clamping groove (2251) for the end of the clamping rod (226) to be embedded in, when the clamping plate (222) slides in a direction close to the sample (4), the inner wall of the guiding arc groove (2223) guides the clamping rod (226) to slide in a direction close to the clamping groove (2251), and the end of the clamping rod (226) is embedded in the clamping groove (2251) to form a limit.

5. The automatic thermal extension testing machine according to claim 2, characterized in that: The clamping plate (222) comprises an airbag portion (2221) and a sliding portion (2222); the sliding portion (2222) is slidably connected to the surface of the limiting frame (21); the elastic member 1 (223) is connected to the surface of the sliding portion (2222); the airbag portion (2221) is connected to the surface of the sliding portion (2222) facing the positioning piston (221); the surface of the airbag portion (2221) and the surface of the limiting frame (21) can be pressed against both sides of the end of the sample (4) to form a limit.

6. The automatic thermal extension testing machine according to claim 5, characterized in that: The sliding portion (2222) is connected to a tensioning assembly (5), and the tensioning assembly (5) includes a thermal expansion and contraction strip (51) and a starting piston (52). A deformation cavity (2224) for accommodating the thermal expansion and contraction strip (51) is provided on the surface of the sliding portion (2222). The deformation cavity (2224) is connected to the inner cavity of the airbag portion (2221). The starting piston (52) is slidably connected to the inner wall of the deformation cavity (2224). The sliding direction of the starting piston (52) and the sliding direction of the positioning piston (221) are parallel to each other. The starting piston (52) divides the deformation cavity (2224) into a deformation section 1 (2225) and a deformation section 2 (2226). The thermal expansion and contraction strip ( 51) is located in the deformation segment one (2225), the inner cavity of the airbag portion (2221) is connected to the deformation segment two (2226), the surface of the starting piston (52) facing the deformation segment one (2225) is provided with a connecting flow channel one (521), and the surface of the starting piston (52) facing the deformation segment two (2226) is provided with a connecting flow channel two (522), when the thermal expansion and contraction strip (51) heats up and expands, the starting piston (52) is driven to slide in the direction close to the deformation segment two (2226), and the deformation segment one (2225), the connecting flow channel one (521), the connecting flow channel two (522), the deformation segment two (2226) and the inner cavity of the airbag portion (2221) are connected.

7. An automatic thermal extension testing machine according to claim 6, characterized in that: The sliding portion (2222) is connected to a warning component (6), and the warning component (6) comprises a contact switch 1 (61) and a warning light (62). The contact switch 1 (61) is connected to the inner wall of the second deformation segment (2226), and the warning light (62) is connected to the surface of the sliding portion (2222). The warning light (62) is electrically connected to the contact switch 1 (61). When the starting piston (52) slides in a direction close to the second deformation segment (2226), the contact switch 1 (61) abuts against the starting piston (52) and is turned on, and the warning light (62) is energized and emits light.

8. The automatic thermal extension testing machine according to claim 7, characterized in that: The warning component (6) further comprises a connecting rod 1 (63) and a connecting rod 2 (64); one end of the connecting rod 1 (63) is rotatably connected to the surface of the limit frame (21); the other end of the connecting rod 1 (63) is rotatably connected to the end of the connecting rod 2 (64); and the other end of the connecting rod 2 (64) is rotatably connected to the surface of the sliding portion (2222).

9. The automatic thermal extension testing machine according to claim 2, characterized in that: The aging box (1) is connected to a power assembly (7), and the power assembly (7) includes a power motor (71) and a power screw (72). The power motor (71) is connected to the inner wall of the aging box (1), and the end of the power screw (72) is coaxially connected to the motor shaft of the power motor (71). The limit frame (21) is threadedly connected to the outer wall of the power screw (72), and the limit frame (21) can slide along the axis of the power screw (72) toward the door of the aging box (1).

10. An automatic thermal extension testing machine according to claim 9, characterized in that: The power assembly (7) comprises a connecting rod three (73), a sliding plate (74) and a contact switch two (75); the inner wall of the aging box (1) is provided with a sliding cavity (11) for the sliding plate (74) to slide; the sliding direction of the sliding plate (74) and the axis of the power screw rod (72) are parallel to each other; one end of the connecting rod three (73) is rotatably connected to the surface of the sliding plate (74); the other end of the connecting rod three (73) is rotatably connected to the cabinet door of the aging box (1); The second contact switch (75) is connected to the bottom wall of the sliding cavity (11), and the second contact switch (75) is electrically connected to the power motor (71). When the cabinet door of the aging box (1) rotates in a direction away from the limit frame (21), the third connecting rod (73) rotates, driving the sliding plate (74) to slide in a direction close to the second contact switch (75). The second contact switch (75) abuts against the sliding plate (74) and is turned on, and the power motor (71) is energized and operates.

Images