Fluororubber piece tensile force testing device

Abstract

The invention relates to the technical field of fluororubber piece tensile force detection, in particular to a fluororubber piece tensile force testing device which comprises a testing table, and the top end of the testing table is fixedly connected with a testing cover; and the self-adaptive clamping mechanism is arranged in the testing cover, the self-adaptive clamping mechanism comprises two symmetrical supporting plates, and two symmetrical fixing plates are fixedly connected to the outer walls of the opposite sides of the two supporting plates. The moving distance of the clamping plate is measured through an infrared distance meter composed of a first infrared emitter, a first infrared receiver and a PLC, then the thickness of the fluororubber part is obtained, the PLC adjusts the magnitude of current introduced into an electromagnetic block in a self-adaptive mode according to the thickness of the fluororubber part, and the thickness of the fluororubber part is measured through the repulsive force of the electromagnetic block to a permanent magnet block. The permanent magnet blocks push the clamping plates to clamp the fluororubber piece, the clamping force can be automatically adjusted according to the thickness of the fluororubber piece, excessive clamping is avoided, and it can be guaranteed that the fluororubber piece cannot be loosened during a tensile test.

Description

Technical Field

[0001] The invention relates to the technical field of fluororubber part tensile force detection, and in particular to a fluororubber part tensile force testing device. Background Art

[0002] Fluororubber has been widely used in many fields such as aerospace, automobile manufacturing, petrochemical industry, etc. due to its excellent properties such as high temperature resistance, chemical corrosion resistance and oil resistance. For example, in key components such as aircraft engine seals, automobile engine oil seals and oil pipeline sealing gaskets, fluororubber parts play a vital role. The quality of their performance directly affects the safety and reliability of the entire system. Among them, the tensile force of fluororubber is very important. Through the tensile force test, key data such as the tensile strength and elongation at break of fluororubber parts can be obtained, so as to determine whether they meet the requirements of actual use. For example, a rubber part tensile force testing device disclosed in application number CN202311781881.0 is used to perform tensile force tests on rubber parts.

[0003] When the fluororubber parts are subjected to tensile force test, the existing tensile force test device usually fixes the fluororubber parts on the fixture of the device, adjusts them to a suitable position, and then applies tensile force through a driving mechanism, while using sensors to monitor the force value and the deformation of the rubber parts in real time to complete the test. However, when the fluororubber parts are stretched and broken, they break little by little, not instantly. The reason is that fluororubber has high elasticity and flexibility, and can withstand and buffer tensile force to a certain extent, so that the fracture process is gradual. As the tensile force continues to act, cracks will gradually appear on the rubber parts and eventually break. However, the existing tensile force test device cannot detect the tensile force at the beginning of the fracture, but can only detect the tensile force at the time of complete fracture. Because it is impossible to obtain the tensile force data of the fluororubber parts at the critical stage of crack initiation, the evaluation of the mechanical properties of the fluororubber parts lacks key information, which is not conducive to a comprehensive understanding of the complete mechanical behavior of the material from the beginning of damage to complete fracture. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a fluororubber tensile force testing device, which can effectively solve the problem that the prior art cannot detect the tensile force at the beginning of fracture.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a fluororubber tensile force testing device, comprising: A test bench, a top end of which is fixedly connected to a test cover; An adaptive clamping mechanism, the adaptive clamping mechanism is arranged in the test cover, the adaptive clamping mechanism comprises two symmetrical support plates, two symmetrical fixing plates are fixedly connected to the outer walls on opposite sides of the two support plates, an electromagnetic block is fixedly connected to the outer walls on opposite sides of each of the two fixing plates, a clamping plate is slidably connected to the outer wall on the opposite side of the support plate, and a permanent magnetic block that magnetically repels the electromagnetic block is fixedly connected to the outer wall on one side of the clamping plate close to the electromagnetic block; A fracture detection mechanism, wherein the fracture detection mechanism is arranged in a test cover, and the fracture detection mechanism also includes two nozzles for spraying magnetic powder on both sides of the fluororubber part. Two symmetrical sliding grooves are provided on the inner wall on the opposite side of the test cover, and a sliding block is slidably arranged in the sliding groove. The outer wall of the sliding block is fixedly connected with a multi-stage electric telescopic rod, and the telescopic end of the multi-stage electric telescopic rod is fixedly connected with an extension plate. The upper end of the extension plate is rotatably provided with a detection shell, and the inner wall of the detection shell is fixedly connected with a first electromagnetic plate, a light board, and a transparent plate in sequence. A photoelectric detector is fixedly connected on the inner wall on the opposite side of the test cover, and is used to receive light emitted by the light board.

[0006] Preferably, the inner walls on opposite sides of the test cover are fixedly connected to two symmetrical movable grooves, the inner walls of each movable groove are fixedly connected to a connecting plate, every two connecting plates on the same horizontal plane as the support plates are respectively fixedly connected to the two support plates, the inner walls on the adjacent sides of every two movable grooves close to each other are fixedly connected to a fixing spring, the other ends of the multiple fixing springs are respectively fixedly connected to the connecting plates close to themselves, the opposite sides of the two support plates are fixedly connected to a force sensor, the outer wall of the test cover is fixedly connected to two symmetrical first motors, the two first motors are located at the two ends of the test cover, the output ends of the first motors are fixedly connected to a winding rod, the outer wall of each winding rod is fixedly connected to a winding rope, the other ends of the winding ropes are respectively fixedly connected to the force sensors close to themselves.

[0007] Preferably, the adaptive clamping mechanism also includes a slide groove opened on the opposite side of the two support plates, the inner wall of the slide groove is slidably connected to two symmetrical sliders, the outer wall of the slider is fixedly connected to the clamping plate, and a plastic spring is fixedly connected between the electromagnetic block and the permanent magnet block, one of the sliders is fixedly connected to the outer wall with a first infrared transmitter, and the inner wall of the slide groove is fixedly connected to the first infrared receiver, the first infrared receiver is used to receive infrared rays emitted by the first infrared transmitter, the first infrared receiver and the first infrared transmitter are electrically signal connected to a PLC controller to form a first ranging circuit, and the PLC controller is electrically signal connected to the electromagnetic block to form a clamping circuit.

[0008] Preferably, the fracture detection mechanism also includes two symmetrical supporting blocks fixedly connected at two symmetrical inner top wall inclined surfaces of the fixed cover, the outer walls of the two supporting blocks in the same longitudinal horizontal plane are fixedly connected to the second motor, the output end of the second motor is fixedly connected to a rotating rod, and the outer walls of the rotating rod are respectively fixedly connected to the two nozzles.

[0009] Preferably, the bottom end of the test bench is fixedly connected to a supporting leg, the bottom end of the test bench is fixedly connected to a storage box, magnetic powder is stored in the storage box, the two inclined surfaces at the top of the test cover are fixedly connected to a powder pump, the extraction end of the powder pump is fixedly connected to a extraction pipe, the extraction pipe is fixedly connected to the interior of the storage box, the output end of the powder pump is fixedly connected to a telescopic flexible tube, the other end of the telescopic flexible tube is fixedly connected to a nozzle, the PLC controller is electrically connected to the nozzle and the powder pump to form a powder spraying circuit.

[0010] Preferably, two symmetrical third motors are fixedly connected to the outer wall of one side of the test cover, the output end of the third motor is fixedly connected to a threaded rod, the sliding block is threadedly sleeved on the outer wall of the threaded rod, the bottom end of the extension plate is fixedly connected to a fifth motor, the output end of the fifth motor is fixedly connected to the detection shell, the photoelectric detector, the first electromagnetic board, the light board, the fifth motor, the third motor are electrically connected to the PLC controller and form a detection circuit.

[0011] Preferably, a fourth motor is fixedly connected to the outer wall of one side of the test cover, and a connecting groove is provided on the inner wall of the opposite side of the test cover, the output end of the fourth motor is fixedly connected to a reciprocating screw, the other end of the reciprocating screw is rotatably connected to one of the side walls of the connecting groove, the outer wall of the reciprocating screw is fixedly connected to a first moving block, and the inner wall of the other connecting groove is slidably connected to a second moving block, the first moving block and the second moving block are commonly fixedly connected to a triangular block, the bottom end of the triangular block is fixedly connected to a second electromagnetic plate, a discharge trough is provided at the bottom end of the test bench, the discharge trough is connected to the storage box, the PLC controller is electrically connected to the second electromagnetic plate and the fourth motor to form a collection loop.

[0012] Preferably, a second infrared transmitter is fixedly connected to the inner wall on one side of the test cover, a second infrared receiver is fixedly connected to a fixing plate close to the second infrared transmitter, and the second infrared receiver is used to receive infrared rays emitted by the second infrared transmitter, the second infrared receiver, the second infrared transmitter and the PLC electrical signal connection controller form a second ranging circuit, and two symmetrical operating ports are provided on the outer walls on both sides of the test cover.

[0013] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. The infrared rangefinder composed of the first infrared transmitter, the first infrared receiver and the PLC controller measures the moving distance of the clamping plate, and then obtains the thickness of the fluororubber part. The PLC controller adaptively adjusts the current passed into the electromagnetic block according to the thickness of the fluororubber part, and utilizes the repulsive force of the electromagnetic block on the permanent magnet block to make the permanent magnet block push the clamping plate to clamp the fluororubber part. The clamping force can be automatically adjusted according to the thickness of the fluororubber part, which neither over-clamps nor ensures that the fluororubber part will not loosen during the tensile test, thereby improving the accuracy and stability of the test.

[0014] 2. During the stretching process, the powder pump and the second motor are started to spray the magnetic powder evenly on the surface of the fluororubber part. When the fluororubber part is not broken, the magnetic powder is difficult to adhere. When it starts to break, the rough surface of the fracture will make the magnetic powder adhere. Then the third motor drives the relevant components to move, and the first electromagnetic plate adsorbs the magnetic powder. After the fifth motor drives the detection shell to rotate 90 degrees, the photoelectric detector detects the light emitted by the light board. When there is magnetic powder, the light will be blocked. When the photoelectric detector detects the change in light, it means that the fluororubber part begins to break. Therefore, the fracture condition and tensile force of the fluororubber part can be fed back according to the amount of magnetic powder adhesion. The tensile force when the fluororubber part just starts to break can be detected, and the tensile force data at the crack initiation stage can be obtained, which is conducive to a comprehensive understanding of the complete mechanical behavior of the material from the beginning of damage to complete fracture, and makes up for the deficiency that the existing device can only detect the tensile force at complete fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention; Figure 3 The cross-sectional three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 4 The cross-sectional three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 5 It is a schematic diagram of the three-dimensional structure of the internal part of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the adaptive clamping mechanism of the present invention; Figure 7 It is a partial three-dimensional structural schematic diagram of the adaptive clamping mechanism of the present invention.

[0017] Figure numerals: 1, test bench; 2, test cover; 3, adaptive clamping mechanism; 31, support plate; 32, fixing plate; 33, electromagnetic block; 34, clamping plate; 35, permanent magnet block; 36, slide groove; 37, slider; 38, plastic spring; 39, first infrared transmitter; 310, first infrared receiver; 4, fracture detection mechanism; 41, nozzle; 42, slide groove; 43, sliding block; 44, multi-stage electric telescopic rod; 45, extension plate; 46, detection shell; 47, first electromagnetic plate; 48, light board; 49, transparent plate; 410, photoelectric detector; 411, bearing block; 412, second motor; 413, rotating rod ; 414, storage box; 415, powder pump; 416, extraction pipe; 417, discharge trough; 418, third motor; 419, threaded rod; 4110, fifth motor; 4111, operation port; 4112, fourth motor; 4113, connecting groove; 4114, reciprocating screw rod; 4115, first moving block; 4116, second moving block; 4117, triangular block; 4118, second electromagnetic plate; 4119, second infrared transmitter; 4120, second infrared receiver; 5, moving groove; 6, connecting plate; 7, fixing spring; 8, force sensor; 9, first motor; 10, winding rod; 11, winding rope. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0020] Example: Refer to Figures 1 to 7 , a fluororubber tensile force testing device, comprising: A test bench 1, a test cover 2 is fixedly connected to the top of the test bench 1, two symmetrical moving grooves 5 are fixedly connected to the inner walls of the opposite sides of the test cover 2, and the inner walls of each moving groove 5 are fixedly connected to a connecting plate 6, and every two connecting plates 6 that are in the same horizontal plane as the support plate 31 are respectively fixedly connected to the two support plates 31, and a fixing spring 7 is fixedly connected to the inner walls of the adjacent sides of every two moving grooves 5 that are adjacent to each other, and the other ends of the plurality of fixing springs 7 are respectively fixedly connected to the connecting plates 6 that are adjacent to themselves, and the opposite sides of the two support plates 31 are fixedly connected to a force value sensor 8, and the outer wall of the test cover 2 is fixedly connected to two symmetrical first motors 9, and the two first motors 9 are located at the two ends of the test cover 2, and the output ends of the first motors 9 are fixedly connected to a winding rod 10, and the outer walls of the winding rod 10 are fixedly connected to a winding rope 11, and the other ends of the winding rope 11 are respectively fixedly connected to the force value sensor 8 that is adjacent to itself; The force sensor 8 is a detection device that converts the physical quantity of force into a measurable electrical signal. It can convert the magnitude of various forces such as tension, pressure, gravity, etc. into corresponding electrical signal outputs such as voltage, current or frequency through internal sensitive elements (such as strain gauges, piezoelectric crystals, etc.). It is widely used in industrial production, material testing, electronic scales and various types of automation equipment to accurately measure and monitor the magnitude of force.

[0021] The adaptive clamping mechanism 3 is arranged in the test cover 2. The adaptive clamping mechanism 3 includes two symmetrical support plates 31. Two symmetrical fixing plates 32 are fixedly connected to the outer walls on opposite sides of the two support plates 31. An electromagnetic block 33 is fixedly connected to the outer walls on opposite sides of each of the two fixing plates 32. A clamping plate 34 is slidably connected to the outer wall on the opposite side of the support plate 31. A permanent magnet block 35 that repel the electromagnetic block 33 is fixedly connected to the outer wall on the side of the clamping plate 34 close to the electromagnetic block 33. The adaptive clamping mechanism 3 also includes a slide groove 36 opened on the opposite side of the two support plates 31, and the inner wall of the slide groove 36 is slidably connected to two symmetrical sliders 37, the outer wall of the slider 37 is fixedly connected to the clamping plate 34, and a plastic spring 38 is fixedly connected between the electromagnetic block 33 and the permanent magnet block 35. The outer wall of one of the sliders 37 is fixedly connected to a first infrared transmitter 39, and the inner wall of the slide groove 36 is fixedly connected to a first infrared receiver 310. The first infrared receiver 310 is used to receive infrared rays emitted by the first infrared transmitter 39. The first infrared receiver 310 and the first infrared transmitter 39 are electrically connected to a PLC controller to form a first ranging circuit. The PLC controller is electrically connected to the electromagnetic block 33 to form a clamping circuit. The PLC controller is a prior art and will not be described in detail here.

[0022] A fracture detection mechanism 4 is arranged in the test cover 2. The fracture detection mechanism 4 also includes two nozzles 41 for spraying magnetic powder on both sides of the fluororubber part. Two symmetrical sliding grooves 42 are arranged on the inner wall on the opposite side of the test cover 2. A sliding block 43 is slidably arranged in the sliding groove 42. The outer wall of the sliding block 43 is fixedly connected with a multi-stage electric telescopic rod 44. The telescopic end of the multi-stage electric telescopic rod 44 is fixedly connected with an extension plate 45. The upper end of the extension plate 45 is rotatably provided with a detection shell 46. The inner wall of the detection shell 46 is fixedly connected with a first electromagnetic plate 47, a light plate 48, and a transparent plate 49 in sequence. The inner wall on the opposite side of the test cover 2 is fixedly connected with a first electromagnetic plate 47, a light plate 48, and a transparent plate 49. A photodetector 410 is connected, which is used to receive the light emitted by the light board 48. Usually, the light board 48 will not affect the magnetic force of the first electromagnetic board 47. In terms of working principle, the light board (such as an LED light board) emits light by the action of electrons and photons, and does not generate interference sources; the first electromagnetic board 47 generates magnetism by the current passing through the coil, and the magnetic force is stable when there is no external interference. In the structural design, the two are electrically isolated and wired differently, and a certain physical distance is maintained to reduce the impact. In terms of material properties, the light board 48 is mostly made of insulating or weakly magnetic materials, and will not interfere with the first electromagnetic board 47; the first electromagnetic board 47 uses high magnetic permeability materials and good conductors, and has stable magnetic properties and is not affected by the operation of the light board; There is a certain relationship between the output electrical signal of the photodetector 410 and the intensity of the incident light, which is usually described by responsiveness. Within a certain range of light intensity, the output electrical signal of the detector is proportional to the intensity of the incident light, that is, the stronger the light intensity, the larger the output electrical signal. For example, when the photodiode is in a reverse biased state, its reverse saturation current will increase linearly with the increase of the intensity of the incident light. By detecting the change in this current, the change in light intensity can be known.

[0023] The fracture detection mechanism 4 also includes two symmetrical supporting blocks 411 fixedly connected at two symmetrical inner top wall inclined surfaces of the fixed cover, and the outer walls of the two supporting blocks 411 in the same longitudinal horizontal plane are fixedly connected to the second motor 412, and the output end of the second motor 412 is fixedly connected to the rotating rod 413, and the outer walls of the rotating rod 413 are respectively fixedly connected to the two nozzles 41, wherein the second motor 412 is a stepping motor. In this case, the stepping motor can only rotate 30 degrees and then reverse itself, and reciprocate in this way.

[0024] The bottom end of the test bench 1 is fixedly connected to a supporting leg, the bottom end of the test bench 1 is fixedly connected to a storage box 414, magnetic powder is stored in the storage box 414, the two inclined surfaces at the top of the test cover 2 are fixedly connected to a powder pump 415, the extraction end of the powder pump 415 is fixedly connected to an extraction pipe 416, the extraction pipe 416 is fixedly connected to the inside of the storage box 414, the output end of the powder pump 415 is fixedly connected to a telescopic flexible tube, the other end of the telescopic flexible tube is fixedly connected to the nozzle 41, the PLC controller is connected to the nozzle 41 and the powder pump 415 by electrical signals to form a powder spraying circuit; The powder pump 415 is a pneumatic diaphragm pump, which uses compressed air as a power source and conveys the medium through the reciprocating motion of the diaphragm. The pneumatic diaphragm pump can convey powdery, light, dry, and easy-flowing powders, including magnetic powders.

[0025] Two symmetrical third motors 418 are fixedly connected to the outer wall of one side of the test cover 2, the output end of the third motor 418 is fixedly connected to the threaded rod 419, the sliding block 43 is threadedly sleeved on the outer wall of the threaded rod 419, the bottom end of the extension plate 45 is fixedly connected to the fifth motor 4110, the output end of the fifth motor 4110 is fixedly connected to the detection shell 46, the photoelectric detector 410, the first electromagnetic plate 47, the light board 48, the fifth motor 4110, the third motor 418 are connected to the PLC controller electrical signal to form a detection circuit.

[0026] A fourth motor 4112 is fixedly connected to the outer wall of one side of the test cover 2, and a connecting groove 4113 is provided on the inner wall of the opposite side of the test cover 2. A reciprocating screw rod 4114 is fixedly connected to the output end of the fourth motor 4112, and the other end of the reciprocating screw rod 4114 is rotatably connected to the side wall of one of the connecting grooves 4113. A first moving block 4115 is fixedly connected to the outer wall of the reciprocating screw rod 4114, and a second moving block 4116 is slidably connected to the inner wall of the other connecting groove 4113. The first moving block 4115 and the second moving block 4116 are fixedly connected to a triangular block 4117 together, and a second electromagnetic plate 4118 is fixedly connected to the bottom end of the triangular block 4117. A discharge trough 417 is provided at the bottom end of the test bench 1, and the discharge trough 417 is connected to the storage box 414. The PLC controller is electrically connected to the second electromagnetic plate 4118 and the fourth motor 4112 to form a collection loop.

[0027] A second infrared transmitter 4119 is fixedly connected to the inner wall of one side of the test cover 2, a second infrared receiver 4120 is fixedly connected to a fixing plate 32 close to the second infrared transmitter 4119, and the second infrared receiver 4120 is used to receive infrared rays emitted by the second infrared transmitter 4119, the second infrared receiver 4120, the second infrared transmitter 4119 and the PLC electrical signal are connected to the controller to form a second distance measurement loop, and two symmetrical operation ports 4111 are provided on the outer walls of both sides of the test cover 2; The PLC controller, the first infrared transmitter 39, the first infrared receiver 310 and the PLC controller, the second infrared transmitter 4119, the second infrared receiver 4120 respectively constitute two infrared rangefinders. The operation of the infrared rangefinder is based on the propagation and reflection principle of infrared rays. The transmitter transmits infrared signals to the target object. When the infrared rays encounter the target object, they will be reflected back. The receiver is responsible for receiving the reflected infrared signals. The PLC controller is used to control the entire measurement process, such as controlling the time interval for the transmitter to transmit signals, receiving and processing signals from the receiver, and calculating the distance based on the time difference between the transmitted and received signals.

[0028] The working principle of the present invention is as follows: First, the operator pulls the clamping plates 34 apart through the operation port 4111, places the fluororubber part to be tested between the two clamping plates 34 through the operation port 4111, and then releases the clamping plates 34, and initially clamps the fluororubber part through the plastic spring 38. Then, the infrared rangefinder composed of the first infrared transmitter 39, the first infrared receiver 310 and the PLC controller can measure the moving distance of the clamping plates 34, and then the thickness of the fluororubber part (moving distance of the clamping plates 34) can be calculated by the PLC controller. The longer the distance, the thicker the fluororubber part). The PLC controller adaptively adjusts the current passed through the electromagnetic block 33 according to the thickness of the fluororubber part (the thickness of the fluororubber part is proportional to the current passed through the electromagnetic block 33. This ratio is based on pre-tests that the current passed through fluororubber parts of different thicknesses can just clamp the fluororubber part, that is, it is not over-clamped and will not loosen during the tensile test). Then, through the repulsive force of the electromagnetic block 33 on the permanent magnet block 35, the permanent magnet block 35 pushes the clamping plate 34 to clamp the fluororubber part.

[0029] When starting the tensile force test, it is necessary to start the first motor 9 first, and drive the winding rod 10 to rotate through the first motor 9, and then wind up the winding rope 11 at a uniform speed, and pull the force sensors 8 on both sides through the two winding ropes 11 respectively, and then apply tensile force to the fluororubber part (when applying tensile force to the fluororubber part, the tensile force will cause tension to be generated inside the fluororubber part. If there is no tensile force, there will be no tension inside the fluororubber part due to stretching. For example, when the fluororubber part is stretched by a tensile testing machine, the tensile force applied by the tensile machine is transmitted to the fluororubber part, so that various parts inside it generate a pulling force, that is, tension. From the above, a stable tensile force is applied to the fluororubber part, that is, a stable tension is applied to the fluororubber part). Under the tensile force applied by the winding rope 11 through the force sensor 8, corresponding tensile deformation will occur, and the force sensor 8 can monitor the magnitude of the tensile force in real time, so that the tensile force data of the fluororubber part, such as the maximum tensile force, yield force, etc., can be obtained; In the process of stretching, two powder pumps 415 are started to extract the magnetic powder in the storage box 414 through the extraction pipe 416, and then the magnetic powder is discharged into the nozzle 41 through the telescopic flexible pipe. At the same time, the second motor 412 is started to drive the nozzle 41 to rotate. After rotating 30 degrees, it automatically reverses, and then the magnetic powder is evenly sprayed on the surface of the fluororubber part. Before the fluororubber part begins to break, the magnetic powder will not be adsorbed on the surface of the fluororubber part. The reason is that fluororubber usually has a very smooth surface. This smoothness makes it difficult for magnetic powder to adhere to its surface. The magnetic powder requires a certain degree of roughness or microstructure to be effectively adsorbed. In addition, the fluororubber part does not have magnetism, so it cannot be adsorbed. When the fluororubber part begins to break, the magnetic powder will roughly adhere to the fracture of the fluororubber part. The reason is that the position where the fluororubber gasket is pulled off is usually rough. This is because when the material is broken by external force, the cross section will form an irregular surface due to the tearing between molecules. This irregular surface can provide more attachment points for the magnetic powder, making it easier for the magnetic powder to adhere to these positions. The magnetic powder spraying is controlled by the PLC controller. Generally, the fluororubber parts are evenly sprayed once and then stopped. During the stopping process, the third motor 418 is started (the starting time of the third motor 418 is calculated based on the moving distance of the support plate 31 detected by the infrared rangefinder composed of the second infrared transmitter 4119, the second infrared receiver 4120 and the PLC controller, and the starting time of the third motor 418 is calculated, and how long the third motor 418 runs is calculated to reverse, so that the detection shell 46 is always moved between the two support plates 31 to prevent affecting the normal tensile force detection). The threaded rod 419 is driven to rotate by the third motor 418, and the sliding block 43 is limited by the sliding groove 42, so that the sliding block 43 drives the multi-stage electric telescopic rod 44, the extension plate 45, and the detection shell 46 to move synchronously, and the first electromagnetic plate 47 is energized, the light board 48 is started, and the multi-stage electric telescopic rod 44 is started, so that the multi-stage electric telescopic rod 44 drives the detection The measuring shell 46 and its internal components move forward, and the magnetic powder is adsorbed by the first electromagnetic plate 47 (the above process is very fast). Then, after the entire stroke is completed, the fifth motor 4110 is controlled by the PLC controller to start, and the fifth motor 4110 drives the measuring shell 46 to rotate 90 degrees. At the same time, the photoelectric detector 410 is started to detect the light emitted by the light board 48. When there is magnetic powder, the magnetic powder will block the light, so the light detected by the photoelectric detector 410 will change, which means that the fluororubber part has begun to break. During the detection process, the magnetic powder is continued to be sprayed, and then the detection is continued. The fracture condition of the fluororubber part can be fed back according to the adhesion amount of the magnetic powder, and then the tensile force of the fluororubber part can be fed back (because this detection process is very fast, but the fracture time will still vary, and the specific fracture time range value can be obtained through multiple detections). After the detection is completed, the first electromagnetic plate 47 is closed to make the magnetic powder fall to the upper surface of the test bench 1.

[0030] And the fourth motor 4112 is always started, so the reciprocating screw rod 4114 is driven to rotate by the fourth motor 4112, and the first movable block 4115 is limited by the connecting groove 4113, so that the first movable block 4115 moves back and forth in the connecting groove 4113, thereby driving the triangular block 4117 and the second electromagnetic plate 4118 to move synchronously, and the magnetic powder scattered on the test bench 1 is collected and adsorbed by the second electromagnetic plate 4118, and then when the second electromagnetic plate 4118 moves to the top of the discharge chute 417, the second electromagnetic plate 4118 is closed by the PLC controller to make the collected magnetic powder fall back into the storage box 414 (the closing time of the second electromagnetic plate 4118 is the time taken by the second electromagnetic plate 4118 to move from the top of the discharge chute 417 to the other end of the test bench 1 and then return to the top of the discharge chute 417 after pre-testing) for subsequent use.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluororubber tensile force testing device, characterized in that: include: A test bench (1), wherein a test cover (2) is fixedly connected to the top of the test bench (1); An adaptive clamping mechanism (3), the adaptive clamping mechanism (3) being arranged in the test cover (2), the adaptive clamping mechanism (3) comprising two symmetrical support plates (31), two symmetrical fixing plates (32) being fixedly connected to the outer walls on opposite sides of the two support plates (31), an electromagnetic block (33) being fixedly connected to the outer walls on opposite sides of each of the two fixing plates (32), a clamping plate (34) being slidably connected to the outer walls on opposite sides of the support plates (31), and a permanent magnet block (35) that magnetically repels the electromagnetic block (33) being fixedly connected to the outer wall on the side of the clamping plate (34) close to the electromagnetic block (33); A fracture detection mechanism (4), the fracture detection mechanism (4) being arranged in a test cover (2), the fracture detection mechanism (4) further comprising two nozzles (41) for spraying magnetic powder on both sides of the fluororubber part, two symmetrical sliding grooves (42) being provided on the inner wall on the opposite side of the test cover (2), a sliding block (43) being slidably arranged in the sliding groove (42), an outer wall of the sliding block (43) being fixedly connected to a multi-stage electric telescopic rod (44), an extension plate (45) being fixedly connected to the telescopic end of the multi-stage electric telescopic rod (44), a detection shell (46) being rotatably arranged on the upper end of the extension plate (45), an inner wall of the detection shell (46) being fixedly connected to a first electromagnetic plate (47), a light plate (48), and a transparent plate (49) in sequence, and a photoelectric detector (410) being fixedly connected to the inner wall on the opposite side of the test cover (2), for receiving light emitted by the light plate (48).

2. A fluororubber tensile force testing device according to claim 1, characterized in that: Two symmetrical moving grooves (5) are fixedly connected to the inner walls of opposite sides of the test cover (2), and the inner walls of each of the moving grooves (5) are fixedly connected to a connecting plate (6). Every two connecting plates (6) located at the same horizontal plane as the support plate (31) are fixedly connected to the two support plates (31) respectively. A fixing spring (7) is fixedly connected to the inner walls of the adjacent sides of every two mutually adjacent moving grooves (5), and the other ends of the fixing springs (7) are respectively fixedly connected to the connecting plates (6) adjacent to themselves. The opposite sides of the two support plates (31) are fixedly connected to a force sensor (8). The outer wall of the test cover (2) is fixedly connected to two symmetrical first motors (9), and the two first motors (9) are located at the two ends of the test cover (2). The output ends of the first motors (9) are fixedly connected to a winding rod (10), and the outer wall of each winding rod (10) is fixedly connected to a winding rope (11), and the other ends of the winding ropes (11) are respectively fixedly connected to the force sensor (8) adjacent to themselves.

3. A fluororubber tensile force testing device according to claim 1, characterized in that: The adaptive clamping mechanism (3) further comprises a slide groove (36) provided on opposite sides of the two support plates (31); the inner wall of the slide groove (36) is slidably connected to two symmetrical sliders (37); the outer wall of the sliders (37) is fixedly connected to the clamping plate (34); a plastic spring (38) is fixedly connected between the electromagnetic block (33) and the permanent magnet block (35); the outer wall of one of the sliders (37) is fixedly connected to a first infrared transmitter (39); the inner wall of the slide groove (36) is fixedly connected to a first infrared receiver (310); the first infrared receiver (310) is used to receive infrared rays emitted by the first infrared transmitter (39); the first infrared receiver (310) and the first infrared transmitter (39) are electrically signal-connected to a PLC controller to form a first distance measurement circuit; the PLC controller is electrically signal-connected to the electromagnetic block (33) to form a clamping circuit.

4. A fluororubber tensile force testing device according to claim 3, characterized in that: The fracture detection mechanism (4) further comprises two symmetrical bearing blocks (411) fixedly connected at two symmetrical inner top wall inclined surfaces of the fixed cover, the outer walls of the two bearing blocks (411) located in the same longitudinal horizontal plane are both fixedly connected to a second motor (412), the output end of the second motor (412) is fixedly connected to a rotating rod (413), and the outer walls of the rotating rod (413) are respectively fixedly connected to the two nozzles (41).

5. A fluororubber tensile force testing device according to claim 4, characterized in that: The bottom end of the test bench (1) is fixedly connected to a support leg, the bottom end of the test bench (1) is fixedly connected to a storage box (414), magnetic powder is stored in the storage box (414), two inclined surfaces at the top end of the test cover (2) are fixedly connected to a powder pump (415), a material extraction end of the powder pump (415) is fixedly connected to a material extraction pipe (416), the material extraction pipe (416) is fixedly connected to the inside of the storage box (414), an output end of the powder pump (415) is fixedly connected to a telescopic flexible pipe (417), the other end of the telescopic flexible pipe (417) is fixedly connected to the nozzle (41), and the PLC controller is connected to the nozzle (41) and the powder pump (415) via electrical signals to form a powder spraying circuit.

6. A fluororubber tensile force testing device according to claim 5, characterized in that: One side outer wall of the test cover (2) is fixedly connected to two symmetrical third motors (418); an output end of the third motor (418) is fixedly connected to a threaded rod (419); the sliding block (43) is threadedly sleeved on the outer wall of the threaded rod (419); a fifth motor (4110) is fixedly connected to the bottom end of the extension plate (45); an output end of the fifth motor (4110) is fixedly connected to the detection shell (46); the photoelectric detector (410), the first electromagnetic plate (47), the light board (48), the fifth motor (4110), and the third motor (418) are connected to a PLC controller by electrical signals to form a detection circuit.

7. A fluororubber tensile force testing device according to claim 6, characterized in that: A fourth motor (4112) is fixedly connected to the outer wall of one side of the test cover (2); a connecting groove (4113) is provided on the inner wall of the opposite side of the test cover (2); a reciprocating screw rod (4114) is fixedly connected to the output end of the fourth motor (4112); the other end of the reciprocating screw rod (4114) is rotatably connected to the side wall of one of the connecting grooves (4113); a first moving block (4115) is fixedly connected to the outer wall of the reciprocating screw rod (4114); and the inner wall of the other connecting groove (4113) is slidably connected to the first moving block (4115). A second moving block (4116) is connected; the first moving block (4115) and the second moving block (4116) are fixedly connected to a triangular block (4117); the bottom end of the triangular block (4117) is fixedly connected to a second electromagnetic plate (4118); a discharge trough (4122) is provided at the bottom end of the test bench (1); the discharge trough (4122) is connected to the storage box (414); the PLC controller is electrically connected to the second electromagnetic plate (4118) and the fourth motor (4112) to form a collection loop.

8. A fluororubber tensile force testing device according to claim 7, characterized in that: A second infrared transmitter (4119) is fixedly connected to the inner wall of one side of the test cover (2), a second infrared receiver (4120) is fixedly connected to a fixing plate (32) close to the second infrared transmitter (4119), and the second infrared receiver (4120) is used to receive infrared rays emitted by the second infrared transmitter (4119), the second infrared receiver (4120) and the second infrared transmitter (4119) are connected to a PLC electrical signal controller to form a second distance measurement circuit, and two symmetrical operating ports (4121) are provided on the outer walls of both sides of the test cover (2).

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