Tensile strength detection device for epoxy resin and polyvinyl composite material

Abstract

The invention discloses a tensile strength detection device for an epoxy resin and polyvinyl composite material, and belongs to the field of tensile strength detection. The tensile strength detection device for the epoxy resin and polyvinyl composite material comprises a supporting table provided with a portal frame and a guide frame, a movable cross beam and a control box which are arranged on the portal frame, and further comprises a first driving assembly for driving the movable cross beam to move up and down, and a second driving assembly for driving the movable cross beam to move up and down, the two clamping parts are used for clamping the sample wafer and are respectively arranged on the upper side of the supporting table and the lower side of the movable cross beam; the two lifting platforms are arranged on the guide frame in a sliding manner; the detection frame is detachably connected to the lifting platform; the problem that the precision is affected by passive movement is effectively solved by adopting an active movement mode, automatic distance fixing can be achieved, errors caused by manual marking and manual clamping are avoided, and the detection precision is improved.

Description

Technical Field

[0001] This invention relates to the field of tensile strength testing technology, and more particularly to a device for testing the tensile strength of epoxy resin and polyethylene composite materials. Background Technology

[0002] Epoxy resin and polyethylene composites are increasingly widely used in high-end fields such as aerospace, electronic packaging, and automotive manufacturing due to their excellent mechanical properties, corrosion resistance, and processability. Tensile strength is a core indicator for evaluating the structural load-bearing capacity of these composites, especially in the research of epoxy resin and polyethylene composites, where the accuracy of its testing results directly determines the effectiveness of material selection, product design, and quality control.

[0003] Currently, the testing process typically involves first preparing multiple samples of the mixed composite material, then testing these samples. During testing, a passive, following method is often used, where the testing clamp directly clamps the sample at the marked points. Markings are manually drawn on both sides of the sample's testing area, and the testing clamp is then fixed at these marks. During stretching, the tensile force of the sample moves the testing clamp, and deformation data is obtained by monitoring changes in the clamp's spacing. This method has the following sources of error: First, manual marking has a width deviation (usually 0.5-1mm), and the position of the marking is easily affected by the operator's experience and deviates from the actual inspection center; Secondly, the clamping device needs to have a large enough clamping force to move with the sample. Excessive clamping force can easily lead to local stress concentration on the sample and damage the uniform deformation of the test area. Third, the weight of the clamping device itself will generate an additional vertical load on the sample, especially when the stiffness of the sample decreases in the later stage of stretching, which can easily cause deformation, further amplify the detection error, and affect the detection accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a tensile strength testing device for epoxy resin and polyethylene composite materials that can overcome or at least partially solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A tensile strength testing device for epoxy resin and polyethylene composite materials includes: a support platform with a gantry and a guide frame, a movable crossbeam and a control box mounted on the gantry, and further includes: a first drive assembly for driving the movable crossbeam to move up and down; two clamping parts for clamping the sample, respectively mounted on the upper side of the support platform and the lower side of the movable crossbeam; two lifting platforms, both slidably mounted on the guide frame; and a testing frame detachably connected to the lifting platforms. The testing frame is symmetrically equipped with first electric telescopic rods, the output end of which is fixedly connected to a first rotating shaft frame. A first cylindrical testing part is rotatably mounted on the first rotating shaft frame. A first detection assembly for detecting the rotation angle of the first cylindrical testing part is provided on one side of the first rotating shaft frame. The rotation status of the first cylindrical testing part is fed back through the detection assembly, and then the first cylindrical testing part is restored to its initial position by moving the lifting platforms.

[0006] In a preferred embodiment of the present invention, the first cylindrical detection part includes a first support bladder rotatably mounted on a first rotating shaft frame, a first thin-film pressure sensor is fixedly mounted on the outside of the first support bladder, and a first wrapping layer that adheres to the sample is mounted on the outside of the first thin-film pressure sensor.

[0007] In a preferred embodiment of the present invention, the first detection component includes a first fixing ring fixedly disposed on a first rotating shaft frame, a first sliding rheostat arranged in an arc shape fixedly connected inside the first fixing ring, and a first conductive block that fits against the first sliding rheostat fixedly connected to the side wall of the first cylindrical detection part.

[0008] In a preferred embodiment of the present invention, a second electric telescopic rod is symmetrically arranged on both sides of the first electric telescopic rod. The telescopic end of the second electric telescopic rod is fixedly connected to a second rotating shaft frame. A second cylindrical detection part is rotatably arranged on the second rotating shaft frame. A second detection component for detecting the rotation of the second cylindrical detection part is arranged on one side of the second cylindrical detection part.

[0009] In a preferred embodiment of the present invention, the second detection component includes a second fixing ring fixedly disposed on the second rotating shaft frame, a second sliding rheostat arranged in an arc shape fixedly connected inside the second fixing ring, and a second conductive block that fits against the second sliding rheostat fixedly connected to the side wall of the second cylindrical detection part.

[0010] In a preferred embodiment of the present invention, the second cylindrical detection part includes a second support bladder rotatably disposed on a second rotating shaft frame, a second thin-film pressure sensor is disposed on the outside of the second support bladder, and a second wrapping layer is disposed on the outside of the second thin-film pressure sensor.

[0011] In a preferred embodiment of the present invention, the first driving assembly includes a first lead screw symmetrically rotating within the gantry frame, both ends of the moving crossbeam being threadedly connected to the first lead screw, a plurality of guide rods being fixedly connected to the guide frame, the lifting platform being slidably mounted on the guide rods, a second lead screw for controlling the lifting and lowering of the lifting platform being symmetrically rotatably connected to the guide frame, and two first motors for rotating the first lead screw and two second motors for driving the second lead screw to rotate being fixedly connected inside the support platform.

[0012] In a preferred embodiment of the present invention, the clamping part includes a connecting seat and a clamping seat mounted on the connecting seat. The clamping seat has a reserved groove and an inclined surface. Limiting blocks are detachably connected to both ends of the inclined surface. Claws are symmetrically arranged between the two inclined surfaces. A clamping surface is provided on the side of the two claws that are close to each other. A placement groove is provided on one side of the claws, and a guide part is provided on the side of the placement groove away from the clamping surface. A cylinder is fixedly connected in the connecting seat. A toothed extrusion rod is provided at the end of the cylinder. An extrusion head is fixedly connected to the end of the extrusion rod and is placed in the placement groove. The present invention also includes a half gear for moving the paper extrusion rod and a control seat detachably connected to the clamping seat. One end of the half gear rotates on the clamping seat, and the other end is fixedly connected to a control rod. Tensile detection mechanisms are fixedly connected to both the support platform and the moving crossbeam. The detection end of the tensile detection mechanism is detachably connected to the connecting seat through a flange.

[0013] In a preferred embodiment of the present invention, the extrusion head is equipped with a distance sensor and a first positioner, and a second positioner is fixedly connected to each of the two detection frames.

[0014] In a preferred embodiment of the present invention, the diameter of the second cylindrical detection part is smaller than the diameter of the first cylindrical detection part, and the hardness of the second cylindrical detection part is higher than the hardness of the first cylindrical detection part.

[0015] Compared with the prior art, the present invention provides a tensile strength testing device for epoxy resin and polyethylene composite materials, which has the following advantages: 1. This tensile strength testing device for epoxy resin and polyethylene composite materials uses two second motors to control the position and distance between two lifting platforms. By adjusting the detection distance, the two lifting platforms can move synchronously and stop at a suitable position. Then, a controller controls two first electric telescopic rods to extend synchronously. Each first electric telescopic rod has a built-in positioning chip at its end for detecting the extension length. The synchronously extended first electric telescopic rods push the first cylindrical detection part against the sample. The friction between the sample and the first cylindrical detection part is sufficient to drive the first cylindrical detection part to rotate. Therefore, when the sample is stretched, the detection area is stretched, and the sample drives the first cylindrical detection part to rotate under the action of friction. The first detection component detects the rotation angle of the first cylindrical detection part in real time. When its position changes, the controller controls the corresponding second motor to rotate, causing the lifting platform to move and reset the first cylindrical detection part. This active movement effectively solves the problem of passive movement affecting accuracy and can automatically determine the distance, avoiding errors caused by manual marking and clamping, thus improving the accuracy of the test.

[0016] 2. The tensile strength testing device for epoxy resin and polyethylene composite materials uses a first support bladder as the main support structure to avoid excessive compression of the sample. In addition, the first wrapping layer is made of flexible rubber, and a first thin-film pressure sensor is set between the first support bladder and the first wrapping layer to detect the pressure of the first wrapping layer adhering to the sample. Therefore, it can provide a more accurate clamping force, avoiding excessive clamping force from affecting the tensile strength of the sample, and also avoiding insufficient clamping force from affecting its testing accuracy. Thus, it effectively improves the accuracy of the tensile strength test results of epoxy resin samples.

[0017] 3. This tensile strength testing device for epoxy resin and polyethylene composite materials comprises a second cylindrical detection section, a second detection component, and a second electric telescopic rod, forming a trial test. During initial processing, the second coating layer in the second cylindrical detection section contacts the sample, requiring the second thin-film pressure sensor to have a certain pressure value. After a certain period, the second electric telescopic rod quickly performs a trial operation. The controller controls the second electric telescopic rod to retract a small distance, gradually reducing the maximum pressure value of the second thin-film pressure sensor. Simultaneously, the second detection component checks whether the second cylindrical detection section rotates normally. If it does not rotate normally, the second electric telescopic rod extends to maintain the pressure required for rotation. At this point, the rotatable pressure data can be synchronized. The controller controls the extension and retraction of the first electric telescopic rod to bring the first thin-film pressure sensor to this pressure value. This adapts to the increased surface friction after the sample is stretched, ensuring testing accuracy while reducing pressure on the sample, further improving testing accuracy.

[0018] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention effectively solves the problem of passive movement affecting accuracy by adopting an active movement method, and can automatically determine the distance, avoiding errors caused by manual marking and manual clamping, thereby improving the accuracy of detection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 1 ; Figure 2 This is a front view of the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 3 This is a schematic diagram of the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the first driving component and the clamping part in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 5 This is a schematic diagram of the clamping part, the testing frame, and the sample in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 6 This is a front view of the clamping part, the testing frame, and the sample in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 7 This is a schematic diagram of the clamping part in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 8 This is a front view of the clamping part in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 9 This is a schematic diagram of the testing frame in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 1 ; Figure 10 This is a schematic diagram of the testing frame in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 2 ; Figure 11 This is a front view of the testing frame in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 12This is a schematic cross-sectional view of the first cylindrical detection section and the second cylindrical detection section in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 1 ; Figure 13 This is a schematic cross-sectional view of the first cylindrical detection section and the second cylindrical detection section in the tensile strength testing device for epoxy resin and polyethylene composite materials proposed in this invention. Figure 2 .

[0020] In the diagram: 1. Support platform; 101. Gantry frame; 102. Guide frame; 103. Moving crossbeam; 104. Control box; 105. First motor; 106. First lead screw; 107. Second motor; 108. Second lead screw; 109. Guide rod; 110. Tensile testing mechanism; 111. Flange; 2. Clamping part; 201. Connecting seat; 202. Clamping seat; 203. Cylinder; 204. Extrusion rod; 205. Gear groove; 206. Control seat; 207. Control rod; 208. Half gear; 209. Extrusion head; 210. Limiting block; 211. Inclined surface; 212. Reserved slot; 213. Distance sensor; 214. First positioner; 3. Gripper; 301. Clamping surface; 302. Placement slot; 303. Guide section; 4. Lifting platform; 401. Detection frame; 402. Second positioner; 5. First electric telescopic rod; 501. First rotating shaft frame; 502. First cylindrical detection section; 503. First support bladder; 504. First thin-film pressure sensor; 505. First wrapping layer; 506. First fixing ring; 507. First sliding rheostat; 508. First conductive block; 6. Second electric telescopic rod; 601. Second rotating shaft frame; 602. Second cylindrical detection section; 603. Second support bladder; 604. Second thin-film pressure sensor; 605. Second wrapping layer; 606. Second fixing ring; 607. Second sliding rheostat; 608. Second conductive block. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example: Refer to Figure 1-Figure 3 A tensile strength testing device for epoxy resin and polyethylene composite materials includes: a support platform 1 with a gantry frame 101 and a guide frame 102, a movable crossbeam 103 mounted on the gantry frame 101, and a control box 104. The control box 104 is connected to a computer for communication, and the computer can identify and acquire relevant data from the control box 104. The movable crossbeam 103 has connecting plates at both its upper and lower ends. A corrugated elastic sheet for dust prevention can be installed on the gantry frame 101. The connecting plates and the corrugated elastic sheet are detachably connected. The device also includes: First drive assembly for driving the moving crossbeam 103 to move up and down; Reference Figure 4 The first drive assembly includes a first lead screw 106 that rotates symmetrically within the gantry frame 101, both ends of the moving crossbeam 103 are threadedly connected to the first lead screw 106, and two clamping parts 2 for clamping the sample are respectively provided on the upper side of the support platform 1 and the lower side of the moving crossbeam 103. Both lifting platforms 4 are slidably mounted on the guide frame 102; Multiple guide rods 109 are fixedly connected to the guide frame 102. A second lead screw 108 for controlling the lifting platform 4 is symmetrically rotatably connected to the guide frame 102. The lifting platform 4 is slidably mounted on the guide rods 109. Two first motors 105 for rotating the first lead screw 106 and two second motors 107 for driving the second lead screw 108 to rotate are fixedly connected inside the support platform 1. Among them, the first motor 105 and the second motor 107 are both servo motors, which, together with the first lead screw 106 or the second lead screw 108, can make precise position adjustments to the lifting platform 4 or the moving crossbeam 103. When testing composite materials, epoxy resin containing polyethylene composite material is first processed into a sample. The width of both ends of the sample is higher than the width of the middle testing part, so as to maintain the uniformity of the middle testing part as much as possible. In specific testing, refer to Figure 1 The sample is installed between two clamping parts 2, which can be clamped by a pneumatic clamping mechanism or other types of mechanical clamping mechanism. The actual test markings are drawn on the sample. Generally, when the test length is 50mm, lines are drawn on both sides of the center position so that the distance between the two markings is 50mm. Then, the test clamping device is used to clamp it at the markings. The test clamping device generally slides on a limit rod. When the test is performed. Reference Figure 4 The controller in the control box 104 controls the rotation of the two first motors 105, causing the moving crossbeam 103 to move slowly and uniformly upward to stretch the sample. In addition, the external shooting mechanism detects the moment when the sample breaks in real time. When it breaks, the microcomputer sends a signal to the controller to stop the rotation of the two first motors 105. In this method, as the sample is stretched, its length increases and the distance between the two markings gradually increases. At this time, due to the movement of the detection clamping device under the tension of the sample, the distance between the two detection clamping devices gradually increases. The maximum tensile length of the detection part can be obtained by the distance between the two detection clamping devices. However, this method has certain drawbacks. The detection clamping device is directly clamped on the sample. On the one hand, a large clamping force is required to keep the device moving with the sample as it is stretched. On the other hand, the weight of the detection clamping device itself will affect the uniform deformation of the sample, ultimately affecting the detection results. Moreover, the detection clamping device is manually clamped at the markings, which are basically marked by humans and have a certain width. Therefore, all of these factors will ultimately affect the accuracy of the detection results. To solve the above problems, the following implementation methods can be adopted, with reference to... Figure 5 and Figure 9 It also includes a detection frame 401, which is detachably connected to the lifting platform 4. The detection frame 401 is symmetrically equipped with a first electric telescopic rod 5. The output end of the first electric telescopic rod 5 is fixedly connected to a first rotating shaft frame 501. A first cylindrical detection part 502 is rotatably arranged on the first rotating shaft frame 501. A first detection component for detecting the rotation angle of the first cylindrical detection part 502 is arranged on one side of the first rotating shaft frame 501. The rotation status of the first cylindrical detection part 502 is fed back through the detection component, and then the first cylindrical detection part 502 is restored to its initial position by the movement of the lifting platform 4.

[0023] In a specific implementation, the positions of the two lifting platforms 4 and the distance between them can be controlled by the two second motors 107. Therefore, after adjusting the corresponding detection distance, the two lifting platforms 4 can be moved synchronously and stopped at a suitable position. Then, the controller controls the two first electric telescopic rods 5 to extend synchronously. The end of the first electric telescopic rod 5 also has a built-in positioning chip for detecting the extension length of the first electric telescopic rod 5. The synchronously extended first electric telescopic rods 5 push the first cylindrical detection part 502 to fit against the sample, and the friction between the sample and the first cylindrical detection part 502 is sufficient. The first cylindrical detection unit 502 is driven to rotate. Therefore, when the sample is stretched, the detection area is stretched, and the sample drives the first cylindrical detection unit 502 to rotate under the action of friction. At this time, the rotation angle of the first cylindrical detection unit 502 is detected in real time by the first detection component. When its position changes, the controller controls the corresponding second motor 107 to rotate, so that the lifting platform 4 moves to achieve the purpose of resetting the first cylindrical detection unit 502. The active movement method effectively solves the problem of passive movement affecting accuracy, and can automatically determine the distance, avoiding errors caused by manual marking and manual clamping, and improving the accuracy of detection.

[0024] In practical applications, refer to Figures 10-13The first cylindrical detection unit 502 can be specifically implemented as follows: the first cylindrical detection unit 502 includes a first support bladder 503 rotatably mounted on the first rotating shaft frame 501, a first thin film pressure sensor 504 fixedly mounted on the outside of the first support bladder 503, and a first wrapping layer 505 that adheres to the sample on the outside of the first thin film pressure sensor 504. The first support bladder 503 serves as the main support structure to avoid excessive compression of the sample. In addition, the first wrapping layer 505 is made of flexible rubber, and the first thin-film pressure sensor 504 set between the first support bladder 503 and the first wrapping layer 505 is used to detect the pressure of the first wrapping layer 505 adhering to the sample. Therefore, it can provide a more precise clamping force, avoid excessive clamping force affecting the stretching of the sample, and also avoid excessive clamping force affecting its detection accuracy. This effectively improves the accuracy of the tensile strength test results of epoxy resin sample. Reference Figure 13 When detecting the rotation of the first cylindrical detection part 502, the following implementation method can be adopted: the first detection component includes a first fixing ring 506 fixedly disposed on the first rotating shaft frame 501, a first sliding rheostat 507 arranged in an arc shape is fixedly connected inside the first fixing ring 506, and a first conductive block 508 that fits against the first sliding rheostat 507 is fixedly connected to the side wall of the first cylindrical detection part 502. To achieve more accurate and timely detection, the first sliding rheostat 507 and the first conductive block 508 are used in combination. The resistance of the circuit containing the first sliding rheostat 507 and the first conductive block 508 can be detected in real time. Then, the rotation data of the first cylindrical detection part 502 can be obtained by comparing the resistance value with the database. In the actual design process, the first sliding rheostat 507 is arranged in a ring and one section is separated by an ultra-thin insulating layer. The contact part of the first conductive block 508 adopts line contact to reduce the error value. In a specific implementation, the same first detection component can be provided at both ends of the first cylindrical detection part 502, and the first sliding rheostats 507 of the two rings can compensate for each other to achieve more accurate detection.

[0025] In specific implementations, to further improve the accuracy of testing the tensile strength of the sample, the following implementation methods can also be adopted, with reference to... Figure 10 and Figure 12 It also includes a second electric telescopic rod 6 symmetrically arranged on both sides of the first electric telescopic rod 5. The end of the second electric telescopic rod 6 has a built-in positioning chip. The telescopic end of the second electric telescopic rod 6 is fixedly connected to a second rotating shaft frame 601. A second cylindrical detection part 602 is rotatably arranged on the second rotating shaft frame 601. A second detection component for detecting the rotation of the second cylindrical detection part 602 is arranged on one side of the second cylindrical detection part 602.

[0026] In the initial stage of testing, the second electric telescopic rod 6 performs the same operation as the first electric telescopic rod 5, so that the end face of the second cylindrical detection part 602 contacts the sample, so that the second cylindrical detection part 602 can rotate when the sample is stretched. Through the cooperation of the second cylindrical detection part 602 and the second detection component, the deformation of the sample thickness is detected. The thickness data detected by the upper and lower sets of second cylindrical detection parts 602 are transmitted to the controller and then to the computer. The computer is equipped with detection software, which can automatically calculate the thickness change data between the upper and lower second cylindrical detection parts 602, thereby obtaining the tilt data of one side. At this time, the thickness data at the first cylindrical detection part 502 is calculated, and the thickness change data during the stretching process can be obtained. Reference Figure 12 and Figure 13 The second detection component includes a second fixing ring 606 fixedly mounted on the second rotating shaft frame 601, a second sliding rheostat 607 arranged in an arc shape fixedly connected inside the second fixing ring 606, and a second conductive block 608 that fits against the second sliding rheostat 607 fixedly connected to the side wall of the second cylindrical detection part 602.

[0027] The second cylindrical detection unit 602 includes a second support bladder 603 rotatably mounted on the second shaft frame 601. A second thin-film pressure sensor 604 is disposed on the outside of the second support bladder 603, and a second wrapping layer 605 is disposed on the outside of the second thin-film pressure sensor 604.

[0028] In addition, in actual work, the second detection component works on the same principle as the first detection component. Two sets can also be set on the second rotating shaft 601 for more accurate detection. Both the first and second detection components can use tilt sensors to achieve detection. During the actual testing process, the first electric telescopic rod 5 will push the first cylindrical detection part 502 to fit against the sample, and when the first thin film pressure sensor 504 detects that its pressure data has decreased, the first electric telescopic rod 5 will extend, and stop extending after the maximum pressure detected by the first thin film pressure sensor 504 reaches the specified value. The second electric telescopic rod 6 and the second cylindrical detection part 602 also perform the same operation. In another implementation, refer to Figure 12 and Figure 13The following working method can be used to perform tensile testing on the epoxy resin sample prepared for the experiment. The second cylindrical detection part 602, together with the second detection component and the second electric telescopic rod 6, forms a trial test. During the initial processing, the second wrapping layer 605 in the second cylindrical detection part 602 contacts the sample, so that the second thin film pressure sensor 604 needs to have a certain pressure value. After a certain period of time, the second electric telescopic rod 6 quickly performs a trial operation. The controller controls the second electric telescopic rod 6 to retract a small distance, so that the maximum pressure value of the second thin film pressure sensor 604 gradually decreases. It also works with the second detection component to detect whether the second cylindrical detection part 602 rotates normally. When it does not rotate normally, the second electric telescopic rod 6 extends to maintain the pressure that allows it to rotate. At this time, the pressure data that allows it to rotate can be synchronized. The controller controls the first electric telescopic rod 5 to extend and retract, so that the first thin film pressure sensor 504 reaches this pressure value. This can adapt to the situation where the surface friction of the sample increases after it is stretched. It can reduce the pressure on the sample while ensuring the detection accuracy, and further improve the detection accuracy.

[0029] If the pressure values ​​obtained by the two sets of second thin-film pressure sensors 604 are different, the larger value shall be used as the basis for adjusting the first thin-film pressure sensor 504.

[0030] When clamping the sample, the following implementation methods can also be used, see reference. Figure 5-Figure 8 The clamping part 2 includes a connecting seat 201 and a clamping seat 202 mounted on the connecting seat 201. The clamping seat 202 has a reserved groove 212 and an inclined surface 211. Limiting blocks 210 are detachably connected to both ends of the inclined surface 211. Claws 3 are symmetrically arranged between the two inclined surfaces 211. A clamping surface 301 is provided on the side of the two claws 3 that are close to each other. A placement groove 302 is provided on one side of the claw 3, and a guide part 303 is provided on the side of the placement groove 302 that is away from the clamping surface 301. A cylinder 203 is fixedly connected in the connecting seat 201. A section is provided at the end of the cylinder 203. The toothed groove 205 includes a pressing rod 204, the end of which is fixedly connected to a pressing head 209, which is placed in a placement groove 302. It also includes a half gear 208 for moving the paper pressing rod 204 and a control seat 206 detachably connected to the clamping seat 202. One end of the half gear 208 rotates on the clamping seat 202, and the other end is fixedly connected to a control rod 207. Tensile detection mechanisms 110 are fixedly connected to both the support platform 1 and the moving crossbeam 103. The detection end of the tensile detection mechanism 110 is detachably connected to the connecting seat 201 via a flange 111.

[0031] When clamping the sample, refer to Figure 6 and Figure 7The operator operates the control lever 207, which pushes the extrusion rod 204 into the cylinder 203 via the half gear 208. At this time, under the action of the extrusion head 209, the two grippers 3 are moved towards the reserved groove 212, so that the two grippers 3 are in the open state. The sample is then placed between the two grippers 3. The control lever 207 is released, and under the action of the air pressure in the cylinder 203, the extrusion rod 204 is reset. The extrusion head 209 squeezes the two grippers 3 to move away from the reserved groove 212. At this time, under the action of the two inclined surfaces 211, the two grippers 3 move closer to each other to clamp the sample. During the process of opening the grippers 3, the extrusion head 209 will squeeze the guide part 303, so that the two grippers 3 are in the open state.

[0032] The tensile testing mechanism 110 is used to detect the maximum tensile force that the sample can withstand during the tensile strength test. The tensile testing mechanism 110 uses a built-in pressure sensor to detect the force and transmits the value to the computer in real time through the controller for recording. After the test, the maximum value is taken as the actual tensile force value.

[0033] To further accurately detect the center of the sample, the following implementation method can be adopted. In a specific implementation method, the extrusion head 209 is equipped with a distance sensor 213 and a first positioner 214, and a second positioner 402 is fixedly connected to both detection frames 401.

[0034] After the sample is clamped, the distance between the sample and the extrusion head 209, as well as the spacing between the two extrusion heads 209, are detected and fed back through the cooperation of two first positioners 214 and two distance sensors 213. This allows the distance between the two ends of the sample to be obtained. Since the sample is a standard processed sample of a specified length, its length remains unchanged during clamping, but bending may occur. Therefore, the moving crossbeam 103 is first driven to rise by two first motors 105 and a first lead screw 106, which can keep the sample in a vertically clamped state and improve detection accuracy. Finally, the specific coordinate position of the sample can be determined by the obtained values. Through the positioning of the second positioner 402 and the cooperation of the second motor 107 and the second lead screw 108, the positions of the two sets of first cylindrical detection parts 502 can be adjusted so that the distance between their contact parts and the center of the sample is the same, thereby effectively improving detection accuracy.

[0035] In a specific implementation, refer to Figure 11 The diameter of the second cylindrical detection part 602 is smaller than the diameter of the first cylindrical detection part 502, and the hardness of the second cylindrical detection part 602 is higher than the hardness of the first cylindrical detection part 502.

[0036] The first support bladder 503 has a lower hardness than the second support bladder 603, and the first wrapping layer 505 and the second wrapping layer 605 have the same softness.

[0037] The small-diameter and relatively rigid second cylindrical detection part 602 facilitates the improvement of the accuracy of sample thickness detection and the determination of friction data on the surface of the sample after stretching, while the large-diameter and relatively flexible first cylindrical detection part 502 can have a relatively large surface contact with the sample, making it easier to rotate and enabling more accurate detection of the sample stretching length.

[0038] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for testing the tensile strength of epoxy resin and polyethylene composite materials, comprising: a support platform (1) on which a gantry (101) and a guide frame (102) are mounted, a movable crossbeam (103) disposed on the gantry (101), and a control box (104), characterized in that, Also includes: First drive assembly for driving the moving crossbeam (103) to move up and down; Two clamping parts (2) for clamping the sample are respectively set on the upper side of the support platform (1) and the lower side of the moving crossbeam (103); Both lifting platforms (4) are slidably mounted on the guide frame (102); The detection frame (401) is detachably connected to the lifting platform (4). The detection frame (401) is symmetrically equipped with a first electric telescopic rod (5). The output end of the first electric telescopic rod (5) is fixedly connected to a first rotating shaft frame (501). A first cylindrical detection part (502) is rotatably arranged on the first rotating shaft frame (501). A first detection component for detecting the rotation angle of the first cylindrical detection part (502) is provided on one side of the first rotating shaft frame (501). The rotation status of the first cylindrical detection part (502) is fed back through the detection component. Then, the first cylindrical detection part (502) is restored to its initial position by the movement of the lifting platform (4).

2. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 1, characterized in that, The first cylindrical detection unit (502) includes a first support bladder (503) rotatably mounted on a first rotating shaft frame (501), a first thin film pressure sensor (504) is fixedly mounted on the outside of the first support bladder (503), and a first wrapping layer (505) that adheres to the sample is mounted on the outside of the first thin film pressure sensor (504).

3. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 2, characterized in that, The first detection component includes a first fixing ring (506) fixedly mounted on the first rotating shaft frame (501), a first sliding rheostat (507) in an arc shape is fixedly connected inside the first fixing ring (506), and a first conductive block (508) that fits against the first sliding rheostat (507) is fixedly connected to the side wall of the first cylindrical detection part (502).

4. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 1, characterized in that, It also includes a second electric telescopic rod (6) symmetrically arranged on both sides of the first electric telescopic rod (5). The telescopic end of the second electric telescopic rod (6) is fixedly connected to a second rotating shaft frame (601). A second cylindrical detection part (602) is rotatably arranged on the second rotating shaft frame (601). A second detection component for detecting the rotation of the second cylindrical detection part (602) is provided on one side of the second cylindrical detection part (602).

5. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 4, characterized in that, The second detection component includes a second fixing ring (606) fixedly mounted on the second rotating shaft frame (601), a second sliding rheostat (607) in an arc shape is fixedly connected inside the second fixing ring (606), and a second conductive block (608) that fits against the second sliding rheostat (607) is fixedly connected to the side wall of the second cylindrical detection part (602).

6. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 4, characterized in that, The second cylindrical detection unit (602) includes a second support bladder (603) rotatably mounted on a second rotating shaft frame (601), a second thin film pressure sensor (604) is disposed on the outside of the second support bladder (603), and a second wrapping layer (605) is disposed on the outside of the second thin film pressure sensor (604).

7. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 1, characterized in that, The first drive assembly includes a first lead screw (106) symmetrically rotating within the gantry frame (101), both ends of the moving beam (103) being threadedly connected to the first lead screw (106), a plurality of guide rods (109) fixedly connected to the guide frame (102), the lifting platform (4) being slidably mounted on the guide rods (109), a second lead screw (108) symmetrically rotating on the guide frame (102) for controlling the lifting of the lifting platform (4), and two first motors (105) for rotating the first lead screw (106) and two second motors (107) for driving the second lead screw (108) to rotate fixedly connected inside the support platform (1).

8. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 1, characterized in that, The clamping part (2) includes a connecting seat (201) and a clamping seat (202) mounted on the connecting seat (201). The clamping seat (202) has a reserved groove (212) and an inclined surface (211). Limiting blocks (210) are detachably connected to both ends of the inclined surface (211). Claws (3) are symmetrically arranged between the two inclined surfaces (211). A clamping surface (301) is provided on the side of the two claws (3) that are close to each other. A placement groove (302) is provided on one side of the claws (3), and a guide part (303) is provided on the side of the placement groove (302) away from the clamping surface (301). A cylinder (203) is fixedly connected in the connecting seat (201). The end of the cylinder (203) The paper press rod (204) with a toothed groove (205) is provided. The end of the press rod (204) is fixedly connected to the press head (209), and the press head (209) is placed in the placement groove (302). The paper press rod (204) is also provided with a half gear (208) for moving the paper press rod (204) and a control seat (206) detachably connected to the clamping seat (202). One end of the half gear (208) rotates on the clamping seat (202), and the other end is fixedly connected to the control rod (207). The support platform (1) and the moving crossbeam (103) are both fixedly connected with a tensile testing mechanism (110). The testing end of the tensile testing mechanism (110) is detachably connected to the connecting seat (201) through a flange (111).

9. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 8, characterized in that, The extrusion head (209) has a built-in distance sensor (213) and a first locator (214), and a second locator (402) is fixedly connected to each of the two detection frames (401).

10. The tensile strength testing device for epoxy resin and polyethylene composite materials according to claim 4, characterized in that, The diameter of the second cylindrical detection part (602) is smaller than the diameter of the first cylindrical detection part (502), and the hardness of the second cylindrical detection part (602) is higher than the hardness of the first cylindrical detection part (502).

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