An automatic hot extension tester

Abstract

The application relates to the field of detection equipment, in particular to an automatic heat 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, the limiting device can clamp a test sample for suspension, the inner cavity of the aging box body can heat the test sample, the measuring assembly comprises a scale, a camera and a computer, the scale is connected to the inner wall of the aging box body, the zero scale line of the scale is aligned with the end of the test sample on the limiting device, the camera is connected to the inner wall of the aging box body facing the test sample, the camera is electrically connected with the camera, the camera shoots a photo of the test sample and transmits the photo to the computer. In the application, the scale, the camera and the computer are arranged, the computer reads the distance of the test sample on the scale in the photo, automatic measurement of the size of the test sample is realized, the elongation rate of the test sample under high-temperature conditions is calculated according to a formula, automatic heat extension detection of the test sample is realized, manual measurement of the length of the test sample by workers is not needed, and therefore the detection precision of the cable is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of detection equipment, in particular to an automatic heat extension testing machine. BACKGROUND

[0002] The heat extension test is an analysis method for evaluating the expansion characteristics and ductility of materials under heating conditions, mainly to understand the thermal stability of materials, design heat treatment process, develop new materials and verify material quality, so as to ensure the stability and reliability of products in actual application.

[0003] In the prior art, the cable heat extension test device needs the worker to use the measuring ruler to measure the extension length of the cable after heating during the test, so as to investigate the cross-linking degree of the cable; but the worker is easy to reduce the temperature shrinkage during the alignment of the zero scale line of the measuring ruler with the end of the cable, thereby reducing the detection accuracy of the cable. SUMMARY

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

[0005] The automatic heat extension testing machine provided by the present application adopts the following technical scheme:

[0006] An automatic heat extension testing machine, comprising 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, the limiting device can clamp the test sample suspension, the inner cavity of the aging box body can heat the test sample, the measuring assembly comprises a ruler, a camera and a computer, the ruler is connected to the inner wall of the aging box body, the zero scale line of the ruler is aligned with the end of the test sample on the limiting device, the camera is connected to the inner wall of the aging box body facing the test sample, the camera is electrically connected with the camera, the camera takes a photo of the test sample and transmits it to the computer.

[0007] By adopting the above technical scheme, when the test sample is subjected to heat extension test operation, the worker installs the end of the test sample on the limiting device, the test sample is suspended in the inner cavity of the aging box body, the end of the test sample is aligned with the zero scale line of the ruler, and the inner cavity of the aging box body heats the test sample; at the same time, the camera is installed on the inner wall of the aging box body facing the test sample, the camera takes a photo of the test sample in the aging box body in real time, and sends the photo to the computer, the computer reads the distance of the test sample on the ruler in the photo, realizes the automatic measurement of the size of the test sample, and calculates the elongation rate of the test sample under high temperature condition according to the formula, realizes the automatic heat extension detection of the test sample, and does not need the worker to manually measure the length of the test sample, thereby improving the detection accuracy of the cable.

[0008] Optionally, the limiting device comprises a limiting frame and a plurality of positioning assemblies, the limiting frame is connected to the inner wall of the aging box, a plurality of the positioning assemblies are connected to the surface of the limiting frame at intervals, the positioning assembly comprises a positioning piston, a clamping plate and an elastic member I, the surface of the limiting frame is provided with a positioning cavity for the sliding of the positioning piston, the sliding direction of the positioning piston is parallel to the height direction of the aging box, the end of the positioning piston protruding from the limiting frame can abut against the end of the sample, the clamping plate is slidingly connected to the surface of the limiting frame, the sliding direction of the clamping plate is perpendicular to the sliding direction of the positioning piston, one end of the elastic member I in the elastic force direction is connected to the surface of the limiting frame, the other end of the elastic member I in the elastic force direction is connected to the plate surface of the clamping plate, the elastic member I has an elastic force to drive the clamping plate to slide towards the positioning piston, and the end of the clamping plate abuts against the end of the positioning piston, when the end of the sample abuts against the surface of the positioning piston and drives the positioning piston to slide towards the positioning cavity, the end of the positioning piston is flush with the surface of the limiting frame, and the plate surface of the clamping plate and the surface of the limiting frame clamp the two sides of the end of the sample to form a limit.

[0009] By adopting the above technical scheme, the end of the sample abuts against the end of the positioning piston protruding from the limiting frame, and drives the positioning piston to slide towards the positioning cavity, the end of the positioning piston is flush with the surface of the limiting frame, the abutting force between the positioning piston and the clamping plate disappears, the elastic member I has an elastic force to drive the clamping plate to slide towards the sample, and the plate surface of the clamping plate and the surface of the limiting frame clamp the two sides of the end of the sample to form a limit, thereby realizing the synchronous clamping of the limiting device on samples of different sizes, and improving the universality of the automatic hot elongation testing machine.

[0010] Optionally, the positioning assembly further comprises a reset piston and an elastic member II, the surface of the limiting frame is provided with a reset cavity for the sliding of the reset piston, the sliding direction of the reset piston is parallel to the sliding direction of the clamping plate, the reset cavity is communicated with the positioning cavity, one end of the elastic member II in the elastic force direction is connected to the inner wall of the reset cavity, the other end of the elastic member II in the elastic force direction is connected to the surface of the reset piston, the elastic member II has an elastic force to drive the reset piston to slide towards the reset cavity, the end surface of the reset piston is flush with the surface of the limiting frame, and the end of the positioning piston protrudes from the surface of the limiting frame.

[0011] By adopting the technical scheme, the elastic member two drives the reset piston to slide towards the reset cavity, the reset piston end surface is flush with the limiting frame surface, and the positioning piston end portion protrudes from the limiting frame surface; when the sample end portion abuts against the positioning piston end surface and drives the positioning piston to slide towards the positioning cavity, the positioning piston end surface is flush with the limiting frame surface, the positioning cavity is communicated with the reset cavity, the air in the positioning cavity enters the reset cavity and presses the reset piston, drives the reset piston to slide away from the reset cavity, and the reset piston end portion protrudes from the limiting frame surface, so that the worker can directly observe the position of the sample and the positioning piston; when the sample is taken out after the hot elongation test is completed, the clamping plate slides away from the positioning cavity, the abutting effect of the clamping plate surface and the positioning piston end surface disappears, the elastic member two drives the reset piston to slide towards the reset cavity, the reset piston end surface is flush with the limiting frame surface, the air in the reset cavity enters the positioning cavity, the air pressure in the positioning cavity presses the positioning piston, drives the positioning piston to slide away from the positioning cavity, and the positioning piston end portion protrudes from the limiting frame surface, thereby achieving automatic resetting of the positioning piston.

[0012] Optionally, the positioning assembly further comprises a abutting rod, a surface of the limiting frame towards the reset piston is provided with an abutting cavity for sliding of the abutting rod, a sliding direction of the abutting rod and a sliding direction of the positioning piston are parallel to each other, the abutting cavity penetrates through the limiting frame outer wall in a depth direction and faces the clamping plate surface, the clamping plate surface is provided with a guide arc groove for sliding of the abutting rod end portion, and a surface of the reset piston towards the abutting rod is provided with an abutting groove for embedding of the abutting rod end portion; when the clamping plate slides towards the sample, the guide arc groove inner wall guides the abutting rod to slide towards the abutting groove, and the abutting rod end portion is embedded in the abutting groove to form limiting.

[0013] By adopting the technical scheme, when the positioning piston slides towards the positioning cavity and the reset piston end portion protrudes from the limiting frame surface, the abutting groove opening faces the abutting rod surface, the abutting effect of the clamping plate and the positioning piston surface disappears, the elastic member one drives the clamping plate to slide towards the sample, guides the guide arc groove inner wall to guide the abutting rod to slide towards the abutting groove, one end of the abutting rod is located in the abutting cavity, and the other end of the abutting rod is located in the abutting 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.

[0014] Optionally, the clamping plate comprises a gas bag portion and a sliding portion, the sliding portion is connected to the limiting frame surface in a sliding mode, the elastic member one is connected to the surface of the sliding portion, the gas bag portion is connected to the surface of the sliding portion towards the positioning piston, and the gas bag portion surface and the limiting frame surface can abut against both sides of the sample end portion to form limiting.

[0015] By adopting the above technical scheme, when the end of the positioning piston is flush with the surface of the limiting frame, the abutting effect of the end face of the air bag part and the positioning piston disappears, the elastic member one elastic force drives the sliding part to slide towards the sample, the air bag part surface and the limiting frame surface clamp the sample end part on both sides to form a limit, the air bag part converts part of the pressure of the sample into elastic force, reduces the wear between the air bag part and the sample, thereby prolonging the service life of the automatic hot extension tester.

[0016] Optionally, the sliding part is connected with a tensioning assembly, the tensioning assembly comprises a thermal expansion and cold shrink strip and a starting piston, a deformation cavity accommodating the thermal expansion and cold shrink strip is formed in the surface of the sliding part, the deformation cavity is communicated with the inner cavity of the air bag part, the starting piston is slidingly connected to the inner wall of the deformation cavity, the sliding direction of the starting piston is parallel to the sliding direction of the positioning piston, the starting piston divides the deformation cavity into a deformation section one and a deformation section two, the thermal expansion and cold shrink strip is located in the deformation section one, the inner cavity of the air bag part is communicated with the deformation section two, a communication flow channel one is formed in the surface of the starting piston facing the deformation section one, a communication flow channel two is formed in the surface of the starting piston facing the deformation section two, when the thermal expansion and cold shrink strip is heated and expanded, the starting piston is driven to slide towards the deformation section two, and the deformation section one, the communication flow channel one, the communication flow channel two, the deformation section two and the inner cavity of the air bag part are communicated.

[0017] By adopting the above technical scheme, when the aging box body heats the sample, the thermal expansion and cold shrink strip is heated and expanded, the air pressure in the deformation section one increases, the air pressure in the deformation section one drives the starting piston to slide towards the deformation section two, the deformation section one, the communication flow channel one, the communication flow channel two, the deformation section two and the inner cavity of the air bag part are sequentially communicated, the air in the deformation section one sequentially passes through the communication flow channel one, the communication flow channel two and the deformation section two and enters the inner cavity of the air bag part, the surface of the air bag part is pressurized and expanded and abuts against the surface of the sample to form a limit, so that the sample is not easy to be separated from the limiting assembly, thereby improving the limiting stability of the limiting assembly to the sample.

[0018] Optionally, the sliding part is connected with a warning assembly, the warning assembly comprises a contact switch one and a warning lamp, the contact switch one is connected to the inner wall of the deformation section two, and the warning lamp is connected to the surface of the sliding part; the warning lamp is electrically connected with the contact switch one, when the starting piston slides towards the deformation section two, the contact switch one abuts against the starting piston and is turned on, the warning lamp is electrified and emits light.

[0019] By adopting the above technical scheme, when the thermal expansion and cold shrink block is heated and expanded, the air pressure in the deformation section one increases, the air pressure in the deformation section one drives the starting piston to slide towards the deformation section two, the contact switch one abuts against the starting piston and is turned on, the warning lamp is electrified and emits light, thereby warning the staff not to touch the sliding part, reducing the possibility of the staff being scalded, thereby improving the safety of using the automatic hot extension tester.

[0020] Optionally, the warning assembly further comprises a connecting rod I and a connecting rod II, one end of the connecting rod I is rotatably connected to the surface of the limiting frame, the other end of the connecting rod I is rotatably connected to the end of the connecting rod II, and the other end of the connecting rod II is rotatably connected to the surface of the sliding part.

[0021] By adopting the above technical scheme, one end of the connecting rod I rotates on the surface of the limiting frame, the other end of the connecting rod I is rotatably connected to the end of the connecting rod II, and the other end of the connecting rod II rotates on the surface of the sliding part. When it is necessary to unload the sample, the connecting rod I and the connecting rod II are driven to rotate in the direction away from each other, the sliding part is driven to slide in the direction away from the sample, the clamping effect of the sliding part on the sample disappears, and the connecting rod I and the connecting rod II provide a force point for the user, thereby facilitating the control of the sliding of the sliding part.

[0022] Optionally, the aging box body is connected with a power assembly, the power assembly comprises a power motor and a power screw rod, the power motor is connected to the inner wall of the aging box body, the power screw rod is coaxially connected to the motor shaft of the power motor at the end, and the limiting frame is threadedly connected to the outer wall of the power screw rod and can slide along the axis of the power screw rod towards the cabinet door of the aging box body.

[0023] By adopting the above technical scheme, when it is necessary to load the sample, the power motor drives the power screw rod to rotate, thereby driving the limiting frame to slide along the axis of the power screw rod towards the cabinet door of the aging box body, and the limiting frame is close to the opening of the aging box body, thereby facilitating the installation of the sample on the limiting assembly, and improving the installation efficiency of the sample.

[0024] Optionally, the power assembly comprises a connecting rod III, a sliding plate and a contact switch II, the inner wall of the aging box body is provided with a sliding cavity for the sliding of the sliding plate, the sliding direction of the sliding plate is parallel to the axis of the power screw rod, one end of the connecting rod III is rotatably connected to the surface of the sliding plate, the other end of the connecting rod III is rotatably connected to the cabinet door of the aging box body, the contact switch II is connected to the bottom wall of the sliding cavity, and the contact switch II is electrically connected to the power motor. When the cabinet door of the aging box body is rotated away from the limiting frame, the connecting rod III is rotated, thereby driving the sliding plate to slide towards the contact switch II, the contact switch II abuts against the sliding plate and is turned on, the power motor is powered and operates.

[0025] By adopting the above technical scheme, when the cabinet door of the aging box body is driven to rotate away from the limiting frame, the connecting rod III is rotated, thereby driving the sliding plate to slide towards the contact switch II, the contact switch II abuts against the sliding plate and is turned on, the power motor is powered and operates, and the limiting frame is driven to slide along the axis of the power screw rod towards the opening of the aging box body, thereby realizing the directional starting of the sliding of the limiting frame.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. The ruler, camera and computer are arranged, the computer reads the distance of the sample on the ruler in the photo, realizes the automatic measurement of the size of the sample, and calculates the elongation of the sample under high temperature condition according to the formula, realizes the automatic heat extension detection of the sample, without manual measurement of the length of the sample by the staff, thereby improving the detection precision of the cable;

[0028] 2. The positioning piston, clamping plate and elastic piece one are arranged, the two sides of the clamping plate surface and the limiting frame surface clamp the end of the sample, forming a limiting, realizing the synchronous clamping of the limiting device to the sample of different sizes, thereby improving the universality of the automatic heat extension tester;

[0029] 3. The reset piston and elastic piece two are arranged, the reset piston is driven to slide away from the reset cavity, the end of the reset piston protrudes from the surface of the limiting frame, so that the staff can directly observe the position of the sample and the positioning piston. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the overall structure schematic diagram in the embodiment of the application.

[0031] Figure 2 It is the local structure schematic diagram in the embodiment of the application, mainly showing the power assembly.

[0032] Figure 3 It is the local sectional view in the embodiment of the application, mainly showing the positioning assembly.

[0033] Figure 4 It is the local structure schematic diagram in the embodiment of the application, mainly showing the connecting rod one and the connecting rod two.

[0034] Figure 5 It is the local sectional view in the embodiment of the application, mainly showing the contact switch two.

[0035] Explanation of reference signs: 1, aging box; 11, sliding cavity; 2, limiting device; 21, limiting frame; 211, positioning cavity; 212, reset cavity; 213, clamping cavity; 214, abutting cavity; 22, positioning assembly; 221, positioning piston; 222, clamping plate; 2221, air bag part; 2222, sliding part; 2223, guide arc groove; 2224, deformation cavity; 2225, deformation section one; 2226, deformation section two; 223, elastic piece one; 224, elastic piece two; 225, reset piston; 2251, abutting groove; 226, abutting rod; 2261, abutting part; 2262, roller; 3, measuring assembly; 31, scale; 32, camera; 4, test sample; 5, tensioning assembly; 51, thermal expansion and cold shrink strip; 52, starting piston; 521, communication flow passage one; 522, communication flow passage two; 6, warning assembly; 61, contact switch one; 62, warning light; 63, connecting rod one; 64, connecting rod two; 7, power assembly; 71, power motor; 72, power screw; 73, connecting rod three; 74, sliding plate; 75, contact switch two. DETAILED DESCRIPTION

[0036] The following will be described in detail with reference to the accompanying drawings Figures 1-5 The application is further described in detail.

[0037] The application discloses an automatic heat extension testing machine. Referring to Figure 1 and Figure 2 An automatic heat extension testing machine comprises an aging box 1, a limiting device 2 and a measuring assembly 3. The aging box 1 is supported by abutting the ground at the bottom. The limiting device 2 is installed on the inner wall of the aging box 1 and can hold a test sample 4 and suspend the test sample 4 in the inner cavity of the aging box 1. The inner cavity of the aging box 1 heats the suspended test sample 4. The measuring assembly 3 is installed on the aging box 1 and can take pictures of the suspended test sample 4, measure the extension height of the test sample 4 and calculate the elongation rate of the test sample 4. The length of the test sample 4 does not need to be manually measured by a worker, thereby improving the detection accuracy of the cable.

[0038] Referring to Figure 1 and Figure 2 The measuring assembly 3 comprises a scale 31, a camera 32 and a computer. The scale 31 is fixed on the inner wall of the aging box 1 by bolts. The zero scale line of the scale 31 is aligned with the end of the test sample 4 on the limiting device 2. The camera 32 is fixed on the surface of the cabinet door of the aging box 1 by bolts and faces the scale 31. The camera 32 is electrically connected with the computer. The camera 32 is used for taking pictures of the test sample 4 on the scale 31 and sending the pictures to the computer. The computer reads the height of the test sample 4 in the pictures and calculates the elongation rate of the test sample 4, thereby realizing automatic heat extension detection of the test sample 4.

[0039] Referring to Figure 2 and Figure 3The limiting device 2 comprises a limiting frame 21 and a plurality of positioning assemblies 22. The limiting frame 21 is slidingly connected to the inner wall of the aging box 1. The sliding direction of the limiting frame 21 is parallel to the width direction of the aging box 1. The plurality of positioning assemblies 22 are arranged on the surface of the limiting frame 21. The arrangement direction of the positioning assemblies 22 is parallel to the length direction of the limiting frame 21. The positioning assemblies 22 can clamp the end of the sample 4 and limit the sample 4 on the limiting frame 21, so that the sample 4 is not easy to be separated from the limiting frame 21, thereby improving the limiting stability of the sample 4 on the limiting frame 21.

[0040] With reference to Figure 2 and Figure 3 The positioning assembly 22 comprises a positioning piston 221, a clamping plate 222, an elastic member one 223, a reset piston 225, an elastic member two 224 and an abutting rod 226. The materials of the positioning piston 221 and the reset piston 225 can be rubber or silica gel. In the embodiment, the materials of the positioning piston 221 and the reset piston 225 are rubber, which has a certain deformation ability. The surface of the limiting frame 21 is provided with a limiting cavity 211 for the sliding of the positioning piston 221. 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 limiting frame 21 can abut against the end of the sample 4. The surface of the limiting frame 21 facing the cabinet door of the aging box 1 is provided with a reset cavity 212 for the sliding of the reset piston 225. The sliding direction of the reset piston 225 is parallel to the sliding direction of the limiting frame 21. The elastic member two 224 can be a compression spring or a tension spring. In the embodiment, the elastic member two 224 is a compression spring, which has a certain deformation ability. One end of the elastic member two 224 in the elastic force direction is connected to the bottom wall of the reset cavity 212. The other end of the elastic member two 224 in the elastic force direction is connected to the surface of the reset piston 225. The elastic member two 224 has an elastic force to drive the reset piston 225 to slide towards the reset cavity 212, and the end of the positioning piston 221 protruding from the surface of the limiting frame 21 tends to be reset.

[0041] With reference to Figure 2 and Figure 3The clamping plate 222 comprises an air bag part 2221 and a sliding part 2222. The material of the air bag part 2221 can be rubber or silica gel. In the embodiment of the application, the material of the air bag part 2221 is rubber, and the air bag part 2221 has a certain deformation capacity. The air bag part 2221 is fixed to the end face of the sliding part 2222. The surface of the limiting frame 21 is provided with a clamping cavity 213 for the sliding of the sliding part 2222. The clamping cavity 213 is communicated with the positioning cavity 211. The sliding direction of the sliding part 2222 and the sliding direction of the reset piston 225 are parallel to each other, and the surface of the air bag part 2221 faces the surface of the positioning piston 221. The elastic member one 223 can be a compression spring or a tension spring. In the embodiment of the application, the elastic member one 223 is a compression spring, and the elastic member one 223 has a certain deformation capacity. One end of the elastic member one 223 in the elastic force direction is connected to the bottom wall of the clamping cavity 213, and the other end of the elastic member one 223 in the elastic force direction is connected to the surface of the sliding part 2222. The elastic member one 223 has an elastic force to drive the sliding part 2222 to slide towards the positioning piston 221, and the surface of the air bag part 2221 tends to gradually approach the surface of the positioning piston 221.

[0042] With reference to Figure 2 and Figure 3 The abutting rod 226 comprises an abutting part 2261 and a roller 2262. The roller 2262 is rotatably connected to the end of the abutting part 2261. The axis of the roller 2262 and the length direction of the aging box body 1 are parallel to each other. The surface of the limiting frame 21 facing the reset piston 225 is provided with an abutting cavity 214 for the sliding of the abutting part 2261. The sliding direction of the abutting part 2261 and the sliding direction of the positioning piston 221 are parallel to each other. The abutting cavity 214 penetrates through the outer wall of the limiting frame 21 in the depth direction and is communicated with the clamping cavity 213. The wheel surface of the roller 2262 is in rolling contact with the surface of the sliding part 2222. The surface of the sliding part 2222 facing the abutting cavity 214 is provided with a guide arc groove 2223. The inner wall of the guide arc groove 2223 is in the shape of a circular arc. The surface of the reset piston 225 facing the abutting rod 226 is provided with an abutting groove 2251 for the end part of the abutting part 2261 to be embedded.

[0043] With reference to 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 towards the positioning cavity 211, the end of the positioning piston 221 is flush with the surface of the limiting frame 21, the abutting force of the air bag part 2221 against the positioning piston 221 disappears, the elastic member one 223 drives the sliding part 2222 to slide along the inner wall of the clamping cavity 213 towards the sample 4, the surface of the air bag 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, thereby achieving the fixation of the sample 4 on the limiting frame 21; at the same time, the air in the positioning cavity 211 enters the reset cavity 212, the air pressure in the reset cavity 212 drives the reset piston 225 to slide away from the reset cavity 212, the end of the reset piston 225 protrudes from the surface of the limiting frame 21, the slot of the abutting groove 2251 faces the abutting part 2261, the inner wall of the guide arc groove 2223 is in rolling contact with the wheel surface of the roller 2262, and the abutting part 2261 is guided to slide towards the abutting groove 2251, the end of the abutting part 2261 is embedded in the abutting groove 2251, one end of the abutting part 2261 is embedded in the abutting groove 2251, and the other end of the abutting part 2261 is located in the abutting cavity 214, so that the reset piston 225 is not easy to deviate in the reset cavity 212, thereby improving the limiting stability of the reset piston 225 in the reset cavity 212.

[0044] With reference to Figure 2 and Figure 3 The sliding part 2222 is provided with a tensioning assembly 5, the tensioning assembly 5 can inflate and expand in the inner cavity of the air bag part 2221, the tensioning assembly 5 comprises a thermal expansion strip 51 and a starting piston 52, the material of the thermal expansion strip 51 can be rubber or nylon, in the embodiment of the application, the material of the thermal expansion strip 51 is nylon, which has a certain thermal expansion coefficient, the surface of the sliding part 2222 is provided with a deformation cavity 2224 for accommodating the thermal expansion strip 51, the deformation cavity 2224 is communicated with the inner cavity of the air bag part 2221, the material of the starting piston 52 can be rubber or silicone, in the embodiment of the application, the material of the starting piston 52 is rubber, which has a certain deformation ability, the starting piston 52 is slidingly connected to the inner wall of the deformation cavity 2224, the sliding direction of the starting piston 52 is parallel to the sliding direction of the positioning piston 221, the starting piston 52 divides the deformation cavity 2224 into a deformation section one 2225 and a deformation section two 2226, the thermal expansion strip 51 is located in the deformation section one 2225, the deformation section two 2226 is communicated with the inner cavity of the air bag part 2221, the surface of the starting piston 52 towards the deformation section one 2225 is provided with a communication channel one 521, the surface of the starting piston 52 towards the deformation section two 2226 is provided with a communication channel two 522, the communication channel one 521 is communicated with the communication channel two 522, and the surface of the starting piston 52 abuts against the inner wall of the deformation section one 2225 and separates the communication channel two 522 and the deformation section two 2226.

[0045] With reference to Figure 2 and Figure 3When the inner cavity of the aging box 1 heats the sample 4, the thermal expansion and cold contraction strip 51 expands and deforms, the air pressure in the deformation section one 2225 increases, the starting piston 52 slides towards the deformation section two 2226, the sealing effect of the inner wall of the deformation section one 2225 on the opening of the communication channel two 522 disappears, the deformation section one 2225, the communication channel one 521, the communication channel two 522, the deformation section two 2226 and the inner cavity of the air bag part 2221 are sequentially communicated, the air in the deformation section one 2225 sequentially passes through the communication channel, the communication channel two 522 and the deformation section two 2226 and enters the inner cavity of the air bag part 2221, the air bag part 2221 expands under the pressure and abuts against the surface of the sample 4 to form a limit, so that the sample 4 is not easy to separate from the limiting frame 21, thereby improving the limiting stability of the sample 4 on the limiting frame 21.

[0046] Referring to Figure 2 and Figure 3 The sliding part 2222 is provided with a warning assembly 6, which can display the temperature of the sliding part 2222, and the warning assembly 6 includes a contact switch one 61, a warning light 62, a connecting rod one 63 and a connecting rod two 64. The contact switch one 61 is installed on the inner wall of the deformation section two 2226, the warning light 62 is installed on the surface of the sliding part 2222 by bolts, and the contact switch one 61 is electrically connected with the warning light 62. One end of the connecting rod one 63 is rotatably connected to the surface of the limiting frame 21, the other end of the connecting rod one 63 is rotatably connected to the end of the connecting rod two 64, the end of the connecting rod two 64 away from the connecting rod one 63 is rotatably connected to the surface of the sliding part 2222, and the sample 4 is located between the connecting rod one 63 and the connecting rod two 64.

[0047] Referring to Figure 3 and Figure 4 When the thermal expansion and cold contraction strip 51 expands, the starting piston 52 slides towards the deformation section two 2226, the contact switch one 61 abuts against the starting piston 52 and is conductive, the warning light 62 is electrified and emits light, thereby warning the user to stop touching the surface of the sliding part 2222, reducing the possibility of the user being scalded, thereby improving the safety of using the automatic thermal extension testing machine; when the thermal expansion and cold contraction strip 51 shrinks, the air pressure in the deformation section one 2225 decreases, the starting piston 52 slides towards the deformation section one 2225, the contact switch one 61 abuts against the starting piston 52 and is conductive, the warning light 62 is de-energized and stops emitting light, the user drives the connecting rod one 63 and the connecting rod two 64 to rotate away from each other, the connecting rod one 63 and the connecting rod two 64 provide a force point for the user to drive the sliding part 2222 to slide away from the sample 4, the air bag part 2221 abuts against the surface of the sample 4, the sample 4 separates from the limiting frame 21, and the automatic unloading of the sample 4 is realized.

[0048] Referring to Figure 3 and Figure 4, the aging box 1 is provided with a power assembly 7, the power assembly 7 can drive the limiting frame 21 to slide, the power assembly 7 includes a power motor 71, a power screw 72, a connecting rod three 73, a sliding plate 74 and a contact switch two 75, the power motor 71 is fixed in the inner wall of the aging box 1 through bolts, the power motor 71 motor shaft line and the sliding direction of the limiting frame 21 are parallel to each other, the power screw 72 end is coaxially fixed on the power motor 71 motor shaft, the limiting frame 21 is threadedly connected to the outer wall of the power screw 72, and the limiting frame 21 slides along the power screw 72 axis towards the opening of the aging box 1.

[0049] With reference to Figure 2 And Figure 5 Figure 2 Figure 5 , the aging box 1 is provided with a power assembly 7, the power assembly 7 can drive the limiting frame 21 to slide, the power assembly 7 includes a power motor 71, a power screw 72, a connecting rod three 73, a sliding plate 74 and a contact switch two 75, the power motor 71 is fixed in the inner wall of the aging box 1 through bolts, the power motor 71 motor shaft line and the sliding direction of the limiting frame 21 are parallel to each other, the power screw 72 end is coaxially fixed on the power motor 71 motor shaft, the limiting frame 21 is threadedly connected to the outer wall of the power screw 72, and the limiting frame 21 slides along the power screw 72 axis towards the opening of the aging box 1.

[0050] The implementation principle of the automatic heat extension testing machine is as follows: when the sample 4 is subjected to the heat extension test, the cabinet door is driven to rotate away from the aging cabinet 1, the connecting rod 73 is driven to rotate, the sliding plate 74 is driven to slide along the inner wall of the sliding cavity 11 towards 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 powered on and operates, the sliding frame slides along the power screw 72 axis towards the opening of the aging cabinet 1, the user does not need to stretch the body into the inner cavity of the aging cabinet 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 towards the positioning cavity 211, the end of the positioning piston 221 is flush with the surface of the limiting frame 21, the abutting force between the air bag part 2221 and the positioning piston 221 disappears, the elastic part 1 223 is driven by the elastic force to slide the sliding part 2222 along the inner wall of the clamping cavity 213 towards the sample 4, the surface of the air bag 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, and the sample 4 is fixed on the limiting frame 21; the power motor 71 continues to rotate, the limiting frame 21 slides along the power screw 72 axis towards the scale 31, the end of the sample 4 on the limiting frame 21 is aligned with the zero scale line of the scale 31, the camera 32 takes a photo of the sample 4 on the scale 31 and sends it to the computer, the computer reads the height of the sample 4 in the photo and calculates the elongation rate of the sample 4, realizes the automatic heat extension detection of the sample 4, and does not need the staff to manually measure the length of the sample 4, thereby improving the detection accuracy of the cable.

[0051] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An automatic hot extension tester characterized by: The utility model provides an aging box, limiting device and measuring assembly, the limiting device is connected on the inner wall of aging box, the limiting device can hold the suspension of sample, the inner chamber of aging box can heat sample, the measuring assembly includes scale, camera and computer, the scale is connected on the inner wall of aging box, the zero scale line of scale is aligned with the end of sample on the limiting device, the camera is connected on the inner wall of aging box towards sample, the camera is electrically connected with computer, the camera takes the photo of sample and sends to computer, the limiting device includes limiting frame and multiple positioning assembly, the limiting frame is connected on the inner wall of aging box, multiple positioning assembly is connected on the surface of limiting frame, the positioning assembly includes positioning piston, clamping plate and elastic piece one, the surface of limiting frame is provided with positioning cavity for the sliding of positioning piston, the sliding direction of positioning piston and the height direction of aging box are parallel to each other, the end of limiting frame that projects positioning piston can abut the end of sample, the clamping plate is slidably connected on the surface of limiting frame, the sliding direction of clamping plate and the sliding direction of positioning piston are perpendicular to each other, one end of elastic piece one is connected on the surface of limiting frame, the other end of elastic piece one is connected on the plate of clamping plate, elastic piece one has the elastic force to drive clamping plate to slide towards the direction close to positioning piston, and the end of clamping plate abuts the end of positioning piston, when the end of sample abuts the surface of positioning piston and drives positioning piston to slide towards the direction close to positioning cavity, the end of positioning piston is flush with the surface of limiting frame, and the plate of clamping plate and the surface of limiting frame clamp the both sides of the end of sample to form limiting.

2. An automatic thermal extension tester according to claim 1, characterized in that: The positioning assembly (22) further comprises a reset piston (225) and a second elastic member (224), the surface of the limiting frame (21) is provided with a reset cavity (212) for sliding of the reset piston (225), 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 communicated with the positioning cavity (211), one end of the elastic force direction of the second elastic member (224) is connected to the inner wall of the reset cavity (212), the other end of the elastic force direction of the second elastic member (224) is connected to the surface of the reset piston (225), the second elastic member (224) has an elastic force to drive the reset piston (225) to slide in the 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) protrudes from the surface of the limiting frame (21).

3. An automatic thermal extension tester according to claim 2, characterized in that: The positioning assembly (22) further comprises a pressing rod (226), the surface of the limiting frame (21) close to the reset piston (225) is provided with a pressing cavity (214) for sliding of the pressing rod (226), the sliding direction of the pressing rod (226) and the sliding direction of the positioning piston (221) are parallel to each other, the pressing cavity (214) penetrates the outer wall of the limiting frame (21) in the depth direction and faces the plate surface of the clamping plate (222), the plate surface of the clamping plate (222) is provided with a guide arc groove (2223) for sliding of the end of the pressing rod (226), the surface of the reset piston (225) close to the pressing rod (226) is provided with a pressing groove (2251) for embedding of the end of the pressing rod (226), when the clamping plate (222) slides in the direction close to the sample (4), the inner wall of the guide arc groove (2223) guides the pressing rod (226) to slide in the direction close to the pressing groove (2251), and the end of the pressing rod (226) is embedded in the pressing groove (2251) to form limiting.

4. An automatic thermal extension tester according to claim 1, characterized in that: The clamping plate (222) comprises an air bag part (2221) and a sliding part (2222), the sliding part (2222) is slidingly connected to the surface of the limiting frame (21), the first elastic member (223) is connected to the surface of the sliding part (2222), the air bag part (2221) is connected to the surface of the sliding part (2222) close to the positioning piston (221), and the surface of the air bag part (2221) and the surface of the limiting frame (21) can abut against both sides of the end of the sample (4) to form limiting.

5. An automatic thermal extension tester according to claim 4, characterized in that: The sliding part (2222) is connected with a tensioning assembly (5), the tensioning assembly (5) comprises a thermal expansion strip (51) and a starting piston (52), a deformation cavity (2224) for accommodating the thermal expansion strip (51) is formed in the surface of the sliding part (2222), the deformation cavity (2224) is communicated with the inner cavity of the air bag part (2221), the starting piston (52) is slidingly connected to the inner wall of the deformation cavity (2224), the sliding direction of the starting piston (52) is parallel to the sliding direction of the positioning piston (221), the starting piston (52) divides the deformation cavity (2224) into a deformation section one (2225) and a deformation section two (2226), the thermal expansion strip (51) is located in the deformation section one (2225), the inner cavity of the air bag part (2221) is communicated with the deformation section two (2226), a communication flow channel one (521) is formed in the surface of the starting piston (52) facing the deformation section one (2225), a communication flow channel two (522) is formed in the surface of the starting piston (52) facing the deformation section two (2226), when the thermal expansion strip (51) expands due to temperature rise, the starting piston (52) is driven to slide towards the deformation section two (2226), the deformation section one (2225), the communication flow channel one (521), the communication flow channel two (522), the deformation section two (2226) and the inner cavity of the air bag part (2221) are communicated.

6. An automatic thermal extension tester according to claim 5, characterized in that: The sliding part (2222) is connected with a warning assembly (6), the warning assembly (6) comprises a contact switch one (61) and a warning lamp (62), the contact switch one (61) is connected to the inner wall of the deformation section two (2226), the warning lamp (62) is connected to the surface of the sliding part (2222), the warning lamp (62) is electrically connected with the contact switch one (61), when the starting piston (52) slides towards the deformation section two (2226), the contact switch one (61) abuts against the starting piston (52) and is turned on, the warning lamp (62) is electrified and emits light.

7. An automatic thermal extension tester according to claim 6, characterized in that: The warning assembly (6) further comprises a connecting rod one (63) and a connecting rod two (64), one end of the connecting rod one (63) is rotatably connected to the surface of the limiting frame (21), the other end of the connecting rod one (63) is rotatably connected to the end of the connecting rod two (64), the other end of the connecting rod two (64) is rotatably connected to the surface of the sliding part (2222).

8. An automatic thermal extension tester according to claim 1, characterized in that: The aging box (1) is connected with a power assembly (7), the power assembly (7) comprises a power motor (71) and a power lead screw (72), the power motor (71) is connected to the inner wall of the aging box (1), the power lead screw (72) is coaxially connected to the motor shaft of the power motor (71), the limiting frame (21) is threadedly connected to the outer wall of the power lead screw (72), the limiting frame (21) can slide along the axis of the power lead screw (72) towards the cabinet door of the aging box (1).

9. An automatic thermal extension tester according to claim 8, characterized in that: The power assembly (7) includes 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 of the sliding plate (74), the sliding direction of the sliding plate (74) and the axis of the power screw (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 contact switch two (75) is connected to the bottom wall of the sliding cavity (11), the contact switch two (75) is electrically connected with the power motor (71), when the cabinet door of the aging box (1) rotates away from the limiting frame (21), the connecting rod three (73) rotates, drives the sliding plate (74) to slide towards the contact switch two (75), the contact switch two (75) abuts against the sliding plate (74) and is turned on, and the power motor (71) is powered and operates.

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