Baby stroller plastic sample crack detection device and method

Abstract

The invention discloses a baby stroller plastic sample crack detection device and method, and relates to the field of plastic sample crack detection.The baby stroller plastic sample crack detection device comprises a bottom plate, an upper movable clamping plate and a lower movable clamping plate are movably arranged at the upper end of the bottom plate, and the upper movable clamping plate is located above the lower movable clamping plate; the upper movable clamping plate and the lower movable clamping plate are arranged in the same plane, a first conical plate is fixedly arranged at one end of the lower movable clamping plate, a rectangular groove is formed in the inner side of the upper movable clamping plate, a driving rod is movably arranged on the inner side of the rectangular groove, and one end of the driving rod movably extends out of the upper movable clamping plate. According to the invention, two detection methods can be carried out at the same time when the compressive resistance and tensile resistance of a plastic sample are detected through the installation methods and position relations of the upper movable clamping plate, the lower movable clamping plate, the upper fixed clamping plate and the lower fixed clamping plate, so that crack detection can be conveniently and rapidly carried out on the plastic sample; therefore, the effect of improving the detection speed is achieved.

Description

Technical Field

[0001] The invention relates to the field of plastic sample crack detection, and in particular to a baby stroller plastic sample crack detection device and method. Background Art

[0002] Baby strollers are common tools in reality, mainly used for babies to ride. The production of baby strollers mainly involves materials, design, function and safety. Common materials for the frame include stainless steel pipes, aluminum alloys, etc., and the seats focus on breathable and sweat-absorbent materials, such as Oxford cloth and polyester fiber cotton. The design of baby strollers is constantly innovating. For example, the design of side-push baby strollers fully considers ergonomic factors, combines morphological beauty with functionality, and provides a more convenient, safe and comfortable baby travel experience. Safety is an important consideration for baby strollers, including five-point safety belts, double safety locks and other designs to ensure that the baby is in the right place during travel. Safety; the patent with the name of a plastic sample crack detection device (patent application number CN202220949958.5) is retrieved and includes a support seat, a power piece, a first clamp, a second clamp and a detection assembly. The power piece is fixedly mounted on the support seat, the first clamp is mounted on the support seat, the second clamp is mounted on the power output part of the power piece, the detection assembly is mounted on the support seat, and the detection part of the detection assembly faces the connection line between the first clamp and the second clamp. Through the real-time detection of the crack growth rate of the plastic sample, the remaining service life of the corresponding pipeline of the sample is predicted; When a baby stroller is produced, its frame is generally composed of metal parts and plastic parts. According to the above patent, when plastic parts are produced, they are generally subjected to tensile strength tests, compressive strength tests and other tests to ensure the structural firmness of the baby stroller. When testing the rubber of plastic parts, various testing methods are generally required to observe the surface cracks of the plastic parts to observe the basic strength of the plastic parts. When testing the tensile strength and compressive strength, different devices need to be used for testing, which results in the use of more testing devices, affects the testing speed, and requires multiple clamping of the test samples. Therefore, it is necessary to propose a baby stroller plastic sample crack detection device and method to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a device and method for detecting cracks in plastic samples of a baby stroller, so as to solve the problem of slow detection speed of plastic samples.

[0004] To achieve the above object, the present invention provides the following technical solution: a baby stroller plastic sample crack detection device, comprising a bottom plate, an upper movable clamping plate and a lower movable clamping plate are movably provided on the upper end of the bottom plate, the upper movable clamping plate is located above the lower movable clamping plate, and the upper movable clamping plate and the lower movable clamping plate are arranged in the same plane; A first conical plate is fixedly provided at one end of the lower movable clamping plate, a rectangular groove is provided inside the upper movable clamping plate, a driving rod is movably provided inside the rectangular groove, one end of the driving rod movably extends out of the upper movable clamping plate, and a limiting sleeve is fixedly provided at the end of the upper movable clamping plate; A second conical plate is fixedly provided at the lower end of the driving rod, a knife storage groove is provided at the lower end of the upper movable clamping plate, and a cutting knife is movably provided inside the knife storage groove; The first conical plate abuts against the outer side of the driving rod, and the second conical plate abuts against the cutting blade.

[0005] Preferably, an inner cavity groove is opened on the inner side of the lower movable splint, a central axis is rotatably provided on the inner side of the lower movable splint, a fan plate and an involute block are fixedly provided on the outer side of the central axis, an involute auxiliary positioning groove is opened in the middle part of the outer side of the involute block, and a plane auxiliary positioning groove is opened at the lower end of the upper movable splint, and the plane auxiliary positioning groove and the involute auxiliary positioning groove are in the same vertical plane.

[0006] Preferably, a first spring is fixedly provided at one end of the second conical plate, and the end of the first spring is fixedly connected to the inner wall of the rectangular groove; second springs are fixedly provided at both sides of the upper end of the cutting knife, and the end of the second spring is fixedly connected to the inner wall of the knife storage groove; The upper end of the lower movable clamping plate is provided with a knife retreat groove for the cutting knife to enter.

[0007] Preferably, two gear grooves are provided on the upper end of the bottom plate, a gear plate is fixedly provided inside the gear groove, a plurality of fixed gear blocks are fixedly provided on the upper end of the gear plate, and the plurality of fixed gear blocks are arranged in a linear array; The outer surface of the sector plate is arranged in an arc shape, and a plurality of movable tooth blocks are fixedly arranged on the arc surface of the sector plate. The plurality of movable tooth blocks are arranged in a curved array, and the movable tooth blocks and the fixed tooth blocks are meshed with each other.

[0008] Preferably, a positioning rod is fixedly provided on the inner wall of the gear groove, the end of the positioning rod abuts against the outer side of the sector plate, and the end of the positioning rod corresponding to the sector plate is hemispherically arranged.

[0009] Preferably, a hydraulic frame is fixedly provided on the upper end of the bottom plate, a hydraulic cylinder is fixedly provided on the upper end of the hydraulic frame, a pressing plate is movably provided inside the hydraulic frame, and an output end of the hydraulic cylinder is fixedly connected to the upper end of the pressing plate; A guide plate is fixedly provided at the lower end of the pressure plate, an upper fixed clamping plate and a lower fixed clamping plate are provided above the bottom plate, the lower fixed clamping plate is fixedly mounted on the upper end of the bottom plate, and guide blocks are fixedly provided at the upper ends of the upper fixed clamping plate and the upper movable clamping plate, the guide blocks slide on the inner side of the guide plates, the guide blocks and the guide plates are in transitional fit, and the guide plates and the guide blocks are in inner buckle connection; Pressure sensors are fixedly arranged on the corresponding sides of the upper fixed clamping plate and the upper movable clamping plate.

[0010] Preferably, a sinking groove is opened on the upper end of the bottom plate, an electric cylinder is fixedly provided on the inner side of the sinking groove, a tension sensor is fixedly provided on the end of the lower movable clamping plate corresponding to the electric cylinder, and the output end of the electric cylinder is fixedly connected to the tension sensor.

[0011] Preferably, the cross-sections of the planar auxiliary positioning groove and the involute auxiliary positioning groove are both arranged to be arc-shaped openings.

[0012] The present invention also discloses a method for detecting cracks in a plastic sample of a baby stroller, which specifically comprises the following steps: Step 1: Cut the plastic sample to a suitable length, and then place one end of the plastic sample between the upper movable clamping plate and the lower movable clamping plate, and then place the other end of the plastic sample between the upper fixed clamping plate and the lower fixed clamping plate, so that the plastic sample between the upper movable clamping plate and the lower movable clamping plate is placed between the plane auxiliary positioning groove and the involute auxiliary positioning groove, which is used to align the plastic sample and ensure that the plastic sample is in the center of the upper movable clamping plate and the lower movable clamping plate to complete the initial placement of the plastic sample; Step 2: First, start the hydraulic cylinder to fix the plastic sample, so that the upper movable clamping plate moves toward the lower fixed clamping plate, and the upper fixed clamping plate moves toward the lower fixed clamping plate to complete the fixation of the plastic sample. The hydraulic cylinder continuously applies pressure, and the pressure sensor is used to detect the pressure on the plastic sample when it is squeezed; Step 3: The upper movable clamp gradually moves toward the plastic sample, and the cutting knife is automatically controlled to cut the plastic sample. At the same time, the upper movable clamp can compress all the plastic samples cut into two sections for subsequent tensile test; Step 4: After the plastic sample is cut off by the cutting knife, the electric cylinder is started to perform a tensile test on the plastic sample, so that the upper movable clamping plate gradually moves away from the upper fixed clamping plate, and the tensile force is detected by the tensile sensor. When the plastic sample is cut off, the tensile test can be prevented from affecting the compressive test when the plastic sample is subjected to tensile and compressive tests, so that the tensile test and the compressive test can be performed simultaneously; Step 5: When the upper moving clamp is driven by the electric cylinder, the involute block is controlled to rotate through the fan plate and the gear plate. Through the shape of the involute block itself, when the upper moving clamp gradually moves, the involute block gradually rotates, and the plastic sample is gradually pressurized through the involute block to ensure the force on the end of the plastic sample during the tensile test. At the same time, when the plastic sample is subjected to the pressure resistance test, the downward pressure of the upper moving clamp will further increase the force on the end of the plastic sample; Step 6: After the pressure and tensile tests are completed, turn off and reset the electric cylinder and hydraulic cylinder, take out the plastic sample, observe the surface cracks of the plastic sample, and obtain the final results.

[0013] Preferably, in step 6: when the electric cylinder and the hydraulic cylinder are closed and reset, the hydraulic cylinder is reset first, so that all plastic samples can be released at one time, so as to facilitate the quick removal of the plastic samples in priority; At the same time, the cutting knife is reset by the first spring and the second spring, so as to facilitate the next use; In addition, when only one of the tensile test or the compressive test needs to be performed, it is only necessary to place the plastic sample in the corresponding appropriate position.

[0014] Technical effects and advantages of the present invention: 1. Through the installation method and position relationship of the upper movable splint, the lower movable splint, the upper fixed splint and the lower fixed splint, when conducting the compression and tension tests on the plastic specimens, two testing methods can be performed at the same time, which is convenient for rapid crack detection on the plastic specimens, so as to achieve the effect of improving the detection speed; 2. Through the setting of the cutting knife, when two testing methods are performed on the plastic sample at the same time, the cutting knife is moved toward the plastic sample until the plastic sample is cut off to complete the cutting and pressure resistance test of the plastic sample. By cutting the plastic sample, it is possible to prevent the tensile test from affecting the pressure resistance test when the plastic sample is subjected to the tensile and pressure resistance tests, so that the tensile and pressure resistance tests can be performed simultaneously; 3. Through the shape and position setting of the first conical plate and the second conical plate, the plastic sample is automatically cut when the upper movable clamping plate moves. At the same time, the upper movable clamping plate can compress all the plastic samples cut into two sections, which is convenient for subsequent tensile test and pressure test; 4. Through the plane auxiliary positioning groove and the involute auxiliary positioning groove, when placing the plastic sample, ensure that the plastic sample is directly below the upper moving clamping plate, ensure that the force of the plastic sample during the tensile test is on the same horizontal line, and prevent other additional torque from being generated during the plastic sample test; 5. Through the plane auxiliary positioning groove and the involute auxiliary positioning groove, when fixing the plastic sample, due to its shape setting, when clamping the plastic sample, it can clamp plastic samples of various plastic diameters and various shapes, and its application range is wide; 6. Through the setting of the involute block, when the plastic sample is subjected to the tensile test, the shape of the involute block and the setting of the fan-shaped plate can be used to gradually pressurize the plastic sample to ensure the force on the end of the plastic sample during the tensile test. At the same time, when the plastic sample is subjected to the pressure test, the downward pressure of the upper moving clamping plate will further increase the force on the end of the plastic sample; 7. After the test is completed, first reset the hydraulic cylinder to loosen all plastic samples at once, so as to quickly remove the plastic samples first. At the same time, when only one of the tensile test or the pressure test is required, only the plastic sample needs to be placed in the corresponding appropriate position and then the test operation is performed, which is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a baby stroller plastic sample crack detection device from one perspective of the present invention.

[0016] Figure 2 This is a schematic structural diagram of another viewing angle of the baby stroller plastic sample crack detection device of the present invention.

[0017] Figure 3 It is a schematic diagram of the structure above the bottom plate of the present invention.

[0018] Figure 4 It is a schematic diagram of the position structure of the upper movable splint, the lower movable splint, the upper fixed splint and the lower fixed splint of the present invention.

[0019] Figure 5 It is a schematic diagram of the structure of the upper movable clamping plate and the lower movable clamping plate of the present invention.

[0020] Figure 6 It is a schematic diagram of the cross-sectional structure of the upper movable clamping plate and the lower movable clamping plate of the present invention.

[0021] Figure 7 It is a schematic diagram of the cross-sectional structure of the movable clamping plate of the present invention.

[0022] Figure 8 It is a schematic diagram of the driving rod connection structure of the present invention.

[0023] Fig. 9 It is a schematic diagram of the fan-shaped plate structure of the present invention.

[0024] Fig.10 It is a schematic diagram of the involute block structure of the present invention.

[0025] In the figure: 101, bottom plate; 201, upper movable clamping plate; 202, lower movable clamping plate; 203, upper fixed clamping plate; 204, lower fixed clamping plate; 301, first conical plate; 302, limit sleeve; 303, driving rod; 304, rectangular groove; 305, knife storage groove; 306, second conical plate; 307, first spring; 308, cutting knife; 309, second spring; 310, knife retreat groove; 401, inner cavity groove; 402, center axis ; 403, gear groove; 404, gear plate; 405, fixed gear block; 406, positioning rod; 407, fan plate; 408, movable gear block; 409, involute block; 410, plane auxiliary positioning groove; 411, involute auxiliary positioning groove; 501, guide plate; 502, guide block; 6, hydraulic frame; 7, hydraulic cylinder; 8, pressure plate; 9, electric cylinder; 901, sinking trough; 10, pressure sensor; 11, tension sensor. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0027] The present invention provides Figure 1 - Fig.10 A crack detection device for plastic samples of baby strollers is shown. Before the production of baby strollers, various tests such as strength are generally carried out on their components. Among them, plastic crack testing is a key link in evaluating the durability and performance of materials. Before conducting plastic fracture failure analysis, it is necessary to collect broken plastic product samples and background information such as their production, processing, and use environment. The testing techniques are diverse, including maximum rupture force testing to evaluate the bearing capacity of materials under extreme conditions; creep testing to observe the stability of materials under long-term pressure; creep to rupture testing to evaluate the performance of materials under continuous high pressure; and pressure rupture testing to detect the durability of packaging materials in actual use. In addition, macroscopic observation is required to understand the type and possible cause of fracture; microscopic analysis is required to observe the microstructure of the fracture surface; and chemical and physical property tests are required to deeply understand the cause of fracture. 1. Combining the above steps and test results, the specific cause of plastic cracks can be obtained.

[0028] It includes a base plate 101, a hydraulic frame 6 is fixedly provided on the upper end of the base plate 101, a hydraulic cylinder 7 is fixedly provided on the upper end of the hydraulic frame 6, a pressure plate 8 is movably provided on the inner side of the hydraulic frame 6, the hydraulic cylinder 7 is a prior art, and is mainly used to drive the pressure plate 8 to move up and down, the hydraulic cylinder 7 is a standard hydraulic cylinder, and the cylinder size and weight of the standard hydraulic cylinder are: the cylinder inner diameter is 40mm, the outer diameter is 50mm, and the cylinder weight of 500mm in length is 2.775kg‌, which will not be described in detail here, the output end of the hydraulic cylinder 7 is fixedly connected to the upper end of the pressure plate 8, a sinking groove 901 is opened on the upper end of the base plate 101, and an electric cylinder 9 is fixedly provided on the inner side of the sinking groove 901, and the electric cylinder 9 is mainly used to drive the lower movable splint 202 to move, the electric cylinder 9 is a standard cylinder, which is usually used in conjunction with a lifting valve and an electromagnetic pulse valve, these cylinders can work at an ambient temperature of -5°C to 70°C, and can withstand a working pressure of 0.1 to 1Mpa, and the cylinder diameter specification is 125mm, which will not be described in detail here.

[0029] A tension sensor 11 is fixedly provided at the end of the lower movable clamping plate 202 corresponding to the electric cylinder 9. The tension sensor 11 is mainly used to detect the pressure generated when the electric cylinder 9 is working. The output end of the electric cylinder 9 is fixedly connected to the tension sensor 11. The tension sensor 11 is a device that converts physical signals into measurable electrical signal outputs. The tension sensor is also called a resistance strain sensor and belongs to the weighing sensor series. It uses two tension transmission parts to transmit force, and its structure contains a force-sensitive device and two tension transmission parts. The force-sensitive device contains a piezoelectric sheet and a piezoelectric sheet gasket. The latter contains a substrate part and an edge force transmission part. Its characteristic is that the two ends of the two tension transmission parts are fixed together respectively, and the force-sensitive device is clamped by the lateral action surface between the two ends. The piezoelectric sheet gasket is pressed on the central area of ​​the piezoelectric sheet on one side, and the substrate part is located between the other side of the piezoelectric sheet and the edge force transmission part and is close to the piezoelectric sheet. One of its uses is to make a hook scale to replace a beam scale. The actual working environment is crucial to the correct selection of a tension sensor. It is not only related to whether the tension sensor can work normally, its safety and service life, but also the reliability and safety of the entire weighing instrument.

[0030] The upper fixed clamping plate 203 and the upper movable clamping plate 201 are both fixedly provided with a pressure sensor 10 on the corresponding side. The pressure sensor 10 is mainly used to detect the pressure borne by the plastic sample. The pressure sensor is a device or apparatus that can sense the weight force signal and convert the pressure signal into an available output electrical signal according to a certain rule. The specific model is a weighing sensor. The weighing object or the truck is placed on the carrier table. Under the action of gravity, the gravity is transmitted to the weighing sensor through the carrier, causing the elastic body of the weighing sensor to deform, and the strain gauge bridge attached to the elastic body loses balance, outputting an electrical signal proportional to the weight value, and amplifying the signal through a linear amplifier. Then, it is converted into a digital signal through A / D, and the weight signal is processed by the microprocessor of the instrument and then the weight data is directly displayed. After the printer is configured, the weighing data can be printed and recorded. If a computer is configured, the measurement data can be input into the computer management system for comprehensive management.

[0031] An upper movable clamping plate 201 and a lower movable clamping plate 202 are movably provided at the upper end of the bottom plate 101. The upper movable clamping plate 201 is located above the lower movable clamping plate 202. The upper movable clamping plate 201 and the lower movable clamping plate 202 are arranged in the same plane. The plastic sample is cut into a suitable length, and one end of the plastic sample is placed between the upper movable clamping plate 201 and the lower movable clamping plate 202. The other end of the plastic sample is placed between the upper fixed clamping plate 203 and the lower fixed clamping plate 204 to ensure the placement of the plastic sample. A first conical plate 301 is fixedly provided at one end of the lower movable clamping plate 202 for pushing the driving rod 303 to move, a rectangular groove 304 is provided at the inner side of the upper movable clamping plate 201, a driving rod 303 is movably provided inside the rectangular groove 304, one end of the driving rod 303 movably extends out of the upper movable clamping plate 201, a limiting sleeve 302 is fixedly provided at the end of the upper movable clamping plate 201, a second conical plate 306 is fixedly provided at the lower end of the driving rod 303 for pushing the cutting knife 308 to move downward, a knife storage groove 305 is provided at the lower end of the upper movable clamping plate 201, a cutting knife 308 is movably provided inside the knife storage groove 305, the first conical plate 301 abuts against the outer side of the driving rod 303, and the second conical plate 306 abuts against the cutting knife 308; A guide plate 501 is fixedly arranged at the lower end of the pressing plate 8, an upper fixed clamping plate 203 and a lower fixed clamping plate 204 are arranged above the bottom plate 101, the lower fixed clamping plate 204 is fixedly installed at the upper end of the bottom plate 101, and a guide block 502 is fixedly arranged at the upper ends of the upper fixed clamping plate 203 and the upper movable clamping plate 201, the guide block 502 slides on the inner side of the guide plate 501, and the guide block 502 and the guide plate 501 are in transitional fit, and when the guide block 502 is not subjected to force, the guide block 502 is ensured to be in a stationary state, and the guide plate 501 and the guide block 502 are in an inner buckle connection; The first spring 307 is used to drive the cutting knife 308 to move, so that the cutting knife 308 drives the guide plate 501 to move, and the guide plate 501 drives the guide block 502 to move, and the guide block 502 drives the upper movable clamping plate 201 and the upper fixed clamping plate 203 to move, so that the upper movable clamping plate 201 and the upper fixed clamping plate 203 move toward the lower movable clamping plate 202 and the lower fixed clamping plate 204 to press and fix the plastic sample. At the same time, when the upper movable clamping plate 201 moves, it drives the driving rod 303 to move until the driving rod 303 contacts the first conical plate 301, and the driving rod 303 is separated from the limiting sleeve 302 through the inclined surface of the first conical plate 301. The driving rod 303 then drives the second conical plate 306, so that the second conical plate 306 is limited by its own inclined surface and the knife storage groove 305, so that the cutting knife 308 moves toward the plastic sample until the plastic sample is cut off, thereby completing the cutting and pressure resistance test of the plastic sample; After the pressure test is completed, the first spring 307 is controlled to return to the initial state, and the driving rod 303 and the cutting knife 308 are reset through the first spring 307 and the second spring 309 .

[0032] The upper movable clamping plate 201 gradually moves toward the plastic sample, and automatically controls the cutting knife 308 to cut the plastic sample. At the same time, the upper movable clamping plate 201 can compress all the plastic samples cut into two sections, which is convenient for subsequent tensile test.

[0033] A first spring 307 is fixedly provided at one end of the second conical plate 306, and an end of the first spring 307 is fixedly connected to the inner wall of the rectangular groove 304. Second springs 309 are fixedly provided on both sides of the upper end of the cutting knife 308, and an end of the second spring 309 is fixedly connected to the inner wall of the knife storage groove 305. A knife retreat groove 310 for the cutting knife 308 to enter is opened at the upper end of the lower movable clamping plate 202.

[0034] After the plastic sample is cut off by the cutting knife 308, the electric cylinder 9 is started to perform a tensile test on the plastic sample, so that the upper movable clamp 201 gradually moves away from the upper fixed clamp 203, and the tension is detected by the tension sensor 11. By cutting off the plastic sample, it is possible to prevent the tensile test from affecting the compression test when the plastic sample is subjected to tensile and compression tests, so that the tensile and compression tests are performed simultaneously. When the upper movable clamp 201 and the lower movable clamp 202 clamp the plastic sample, the first conical plate 301 is inside the limiting sleeve 302. When the electric cylinder 9 drives the lower movable clamp 202, it is ensured that the upper movable clamp 201 follows the movement of the lower movable clamp 202.

[0035] The inner side of the lower movable clamping plate 202 is provided with an inner cavity groove 401, the inner side of the lower movable clamping plate 202 is provided with a central shaft 402 for rotation, the outer side of the central shaft 402 is fixedly provided with a sector plate 407 and an involute block 409, the sector plate 407 is provided with two, the inner wall of the gear groove 403 is fixedly provided with a positioning rod 406, the end of the positioning rod 406 abuts against the outer side of the sector plate 407, the end of the positioning rod 406 corresponding to the sector plate 407 is hemispherical, and the positioning rod 406 is mainly used to abut against the sector plate Plate 407, an involute auxiliary positioning groove 411 is provided in the middle of the outer side of the involute block 409, and a plane auxiliary positioning groove 410 is provided at the lower end of the upper movable clamping plate 201. The plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411 are in the same vertical plane, and the cross sections of the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411 are both arranged in an arc-shaped opening, so as to facilitate clamping the plastic sample between the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411; Through the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411, when fixing the plastic sample, due to its shape setting, when clamping the plastic sample, it is possible to clamp plastic samples of various plastic diameters and plastic samples of various shapes, and its application range is wide. In addition, through the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411, when placing the plastic sample, it is ensured that the plastic sample is directly below the upper movable clamping plate 201, and the force of the plastic sample during the tensile test is ensured to be on the same horizontal line, thereby preventing other additional torques from being generated during the plastic sample test.

[0036] Two gear grooves 403 are provided at the upper end of the bottom plate 101, a gear plate 404 is fixedly provided inside the gear groove 403, a plurality of fixed tooth blocks 405 are fixedly provided at the upper end of the gear plate 404, the plurality of fixed tooth blocks 405 are arranged in a linear array, the outer surface of the sector plate 407 is arranged in an arc shape, a plurality of movable tooth blocks 408 are fixedly provided on the arc surface of the sector plate 407, the plurality of movable tooth blocks 408 are arranged in a curved array, and the movable tooth blocks 408 and the fixed tooth blocks 405 are meshed with each other.

[0037] The second spring 309 drives the lower movable clamping plate 202, so that the lower movable clamping plate 202 drives the central shaft 402 to move, and the central shaft 402 drives the fan-shaped plate 407 to move. Because the fan-shaped plate 407 is restricted by the fixed tooth block 405 and the movable tooth block 408, the fan-shaped plate 407 rotates, and the fan-shaped plate 407 drives the central shaft 402 to rotate, and the central shaft 402 drives the involute block 409 to rotate, so that the involute block 409 squeezes the plastic sample through its own shape. When testing the tensile force of the plastic sample, the clamping force of the plastic sample is automatically increased synchronously, and the positioning rod 406 is used to prevent the involute block 409 from loosening due to the resetting of the fan-shaped plate 407.

[0038] When the upper movable clamping plate 201 is driven by the electric cylinder 9, the rotation of the involute block 409 is controlled by the fan plate 407 and the gear plate 404. Due to the shape of the involute block 409, when the upper movable clamping plate 201 gradually moves, the involute block 409 gradually rotates, and the plastic sample is gradually pressurized by the involute block 409 to ensure the force on the end of the plastic sample during the tensile test. At the same time, when the plastic sample is subjected to the pressure resistance test, the downward pressure of the upper movable clamping plate 201 will further increase the force on the end of the plastic sample. When the test is completed, the hydraulic cylinder 7 is first reset, so that the hydraulic cylinder 7 drives the guide plate 501 to move, and the guide plate 501 drives the guide block 502 to move, and the guide block 502 drives the upper movable clamping plate 201 and the upper fixed clamping plate 203 to move, so as to loosen all plastic samples at one time, so as to facilitate the quick removal of the plastic samples in priority. At the same time, when only one of the tensile test or the pressure test needs to be performed, it is only necessary to place the plastic sample in the corresponding appropriate position and then perform the detection operation, which is highly practical.

[0039] The present invention also discloses a method for detecting cracks in a plastic sample of a baby stroller, which specifically comprises the following steps: Step 1: Cut the plastic sample to a suitable length, and then place one end of the plastic sample between the upper movable clamping plate 201 and the lower movable clamping plate 202, and then place the other end of the plastic sample between the upper fixed clamping plate 203 and the lower fixed clamping plate 204, so that the plastic sample located between the upper movable clamping plate 201 and the lower movable clamping plate 202 is placed between the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411, so as to align the plastic sample and ensure that the plastic sample is located at the center of the upper movable clamping plate 201 and the lower movable clamping plate 202, so as to complete the initial placement of the plastic sample; Step 2: First, the hydraulic cylinder 7 is started to fix the plastic sample by the hydraulic cylinder 7, so that the upper movable clamping plate 201 moves toward the lower fixed clamping plate 204, and the upper fixed clamping plate 203 moves toward the lower fixed clamping plate 204, so as to complete the fixation of the plastic sample. The hydraulic cylinder 7 continuously applies pressure, and the pressure sensor 10 is used to detect the pressure on the plastic sample when it is squeezed; Step 3: The upper movable clamping plate 201 gradually moves toward the plastic sample, and the cutting knife 308 is automatically controlled to cut the plastic sample. At the same time, the upper movable clamping plate 201 can compress all the plastic samples cut into two sections for subsequent tensile test; Step 4: After the plastic sample is cut off by the cutting knife 308, the electric cylinder 9 is started to perform a tensile test on the plastic sample, so that the upper movable clamping plate 201 gradually moves away from the upper fixed clamping plate 203, and the tensile force is detected by the tensile sensor 11. When the plastic sample is cut off, the tensile test and the pressure test can be prevented from affecting the pressure test, so that the tensile test and the pressure test can be performed simultaneously; Step 5: When the upper movable clamping plate 201 is driven by the electric cylinder 9, the involute block 409 is controlled to rotate through the fan plate 407 and the gear plate 404. Through the shape of the involute block 409 itself, when the upper movable clamping plate 201 gradually moves, the involute block 409 gradually rotates, and the plastic sample is gradually pressurized through the involute block 409 to ensure the force on the end of the plastic sample during the tensile test. At the same time, when the plastic sample is subjected to the pressure resistance test, the downward pressure of the upper movable clamping plate 201 will further increase the force on the end of the plastic sample; Step 6: After the pressure and tensile tests are completed, the electric cylinder 9 and the hydraulic cylinder 7 are turned off and reset, and the plastic sample is taken out to observe the surface cracks of the plastic sample to obtain the final result.

[0040] Step 6: when the electric cylinder 9 and the hydraulic cylinder 7 are closed and reset, the hydraulic cylinder 7 is reset first, so that all plastic samples can be released at one time, so as to facilitate the quick removal of the plastic samples in priority; At the same time, the first spring 307 and the second spring 309 reset the cutting knife 308 for next use; In addition, when only one of the tensile test or the compressive test needs to be performed, it is only necessary to place the plastic sample in the corresponding appropriate position.

Claims

1. A baby stroller plastic sample crack detection device, comprising a bottom plate (101), characterized in that: An upper movable clamping plate (201) and a lower movable clamping plate (202) are movably provided at the upper end of the bottom plate (101), the upper movable clamping plate (201) is located above the lower movable clamping plate (202), and the upper movable clamping plate (201) and the lower movable clamping plate (202) are arranged in the same plane; A first conical plate (301) is fixedly provided at one end of the lower movable clamping plate (202), a rectangular groove (304) is provided on the inner side of the upper movable clamping plate (201), a driving rod (303) is movably provided on the inner side of the rectangular groove (304), one end of the driving rod (303) movably extends out of the upper movable clamping plate (201), and a limiting sleeve (302) is fixedly provided on the end of the upper movable clamping plate (201); A second conical plate (306) is fixedly provided at the lower end of the driving rod (303); a knife storage groove (305) is provided at the lower end of the upper movable clamping plate (201); a cutting knife (308) is movably provided inside the knife storage groove (305); The first conical plate (301) abuts against the outer side of the driving rod (303), and the second conical plate (306) abuts against the cutting knife (308).

2. A baby stroller plastic sample crack detection device according to claim 1, characterized in that: An inner cavity groove (401) is provided on the inner side of the lower movable clamping plate (202), a central axis (402) is rotatably provided on the inner side of the lower movable clamping plate (202), a sector plate (407) and an involute block (409) are fixedly provided on the outer side of the central axis (402), an involute auxiliary positioning groove (411) is provided on the middle part of the outer side of the involute block (409), and a plane auxiliary positioning groove (410) is provided on the lower end of the upper movable clamping plate (201), and the plane auxiliary positioning groove (410) and the involute auxiliary positioning groove (411) are located in the same vertical plane.

3. A baby stroller plastic sample crack detection device according to claim 1, characterized in that: A first spring (307) is fixedly provided at one end of the second conical plate (306), and an end of the first spring (307) is fixedly connected to the inner wall of the rectangular groove (304); second springs (309) are fixedly provided on both sides of the upper end of the cutting knife (308), and an end of the second spring (309) is fixedly connected to the inner wall of the knife storage groove (305); The upper end of the lower movable clamping plate (202) is provided with a knife retreat groove (310) for the cutting knife (308) to enter.

4. A baby stroller plastic sample crack detection device according to claim 2, characterized in that: Two gear grooves (403) are provided at the upper end of the bottom plate (101), a gear plate (404) is fixedly provided inside the gear groove (403), a plurality of fixed gear blocks (405) are fixedly provided at the upper end of the gear plate (404), and the plurality of fixed gear blocks (405) are arranged in a linear array; The outer surface of the sector plate (407) is arranged in an arc shape, and a plurality of movable tooth blocks (408) are fixedly arranged on the arc surface of the sector plate (407). The plurality of movable tooth blocks (408) are arranged in a curved array, and the movable tooth blocks (408) and the fixed tooth blocks (405) are meshed with each other.

5. A baby stroller plastic sample crack detection device according to claim 4, characterized in that: A positioning rod (406) is fixedly provided on the inner wall of the gear groove (403), the end of the positioning rod (406) abuts against the outer side of the sector plate (407), and the end of the positioning rod (406) corresponding to the sector plate (407) is arranged in a hemispherical shape.

6. A baby stroller plastic sample crack detection device according to claim 1, characterized in that: A hydraulic frame (6) is fixedly provided on the upper end of the bottom plate (101), a hydraulic cylinder (7) is fixedly provided on the upper end of the hydraulic frame (6), a pressure plate (8) is movably provided inside the hydraulic frame (6), and an output end of the hydraulic cylinder (7) is fixedly connected to the upper end of the pressure plate (8); A guide plate (501) is fixedly provided at the lower end of the pressing plate (8), an upper fixed clamping plate (203) and a lower fixed clamping plate (204) are provided above the bottom plate (101), the lower fixed clamping plate (204) is fixedly installed at the upper end of the bottom plate (101), and a guide block (502) is fixedly provided at the upper ends of the upper fixed clamping plate (203) and the upper movable clamping plate (201), the guide block (502) slides on the inner side of the guide plate (501), the guide block (502) and the guide plate (501) are in transitional fit, and the guide plate (501) and the guide block (502) are in inner buckle connection; Pressure sensors (10) are fixedly provided on the corresponding sides of the upper fixed clamping plate (203) and the upper movable clamping plate (201).

7. A baby stroller plastic sample crack detection device according to claim 1, characterized in that: A sinking groove (901) is provided at the upper end of the bottom plate (101), an electric cylinder (9) is fixedly provided inside the sinking groove (901), a tension sensor (11) is fixedly provided at the end of the lower movable clamping plate (202) corresponding to the electric cylinder (9), and the output end of the electric cylinder (9) is fixedly connected to the tension sensor (11).

8. The baby stroller plastic sample crack detection device according to claim 2, characterized in that: The cross sections of the plane auxiliary positioning groove (410) and the involute auxiliary positioning groove (411) are both arranged in the form of arc-shaped openings.

9. A method for detecting cracks in a plastic sample of a baby stroller using the device for detecting cracks in a plastic sample of a baby stroller according to any one of claims 1 to 8, characterized in that: The specific steps include: Step 1: Cut the plastic sample into a suitable length, and then place one end of the plastic sample between the upper movable clamping plate (201) and the lower movable clamping plate (202), and then place the other end of the plastic sample between the upper fixed clamping plate (203) and the lower fixed clamping plate (204), so that the plastic sample located between the upper movable clamping plate (201) and the lower movable clamping plate (202) is placed between the plane auxiliary positioning groove (410) and the involute auxiliary positioning groove (411), so as to align the plastic sample and ensure that the plastic sample is located at the center of the upper movable clamping plate (201) and the lower movable clamping plate (202), thereby completing the initial placement of the plastic sample; Step 2: First, the hydraulic cylinder (7) is started to fix the plastic sample by the hydraulic cylinder (7), so that the upper movable clamping plate (201) moves toward the lower fixed clamping plate (204), and the upper fixed clamping plate (203) moves toward the lower fixed clamping plate (204), so as to complete the fixation of the plastic sample. The hydraulic cylinder (7) continuously applies pressure, and the pressure sensor (10) is used to detect the pressure applied to the plastic sample when it is squeezed; Step 3: The upper movable clamping plate (201) gradually moves toward the plastic sample, and the cutting knife (308) is automatically controlled to cut the plastic sample. At the same time, the upper movable clamping plate (201) can compress the plastic sample cut into two sections for subsequent tensile test; Step 4: After the plastic sample is cut by the cutting knife (308), the electric cylinder (9) is started to perform a tensile test on the plastic sample, so that the upper movable clamping plate (201) gradually moves away from the upper fixed clamping plate (203), and the tensile force is detected by the tensile sensor (11). When the plastic sample is cut, the tensile test and the pressure test of the plastic sample can be prevented from being affected by the pressure test, so that the tensile test and the pressure test can be performed simultaneously; Step 5: When the upper movable clamping plate (201) is driven by the electric cylinder (9), the rotation of the involute block (409) is controlled by the fan-shaped plate (407) and the gear plate (404). Due to the shape of the involute block (409), when the upper movable clamping plate (201) gradually moves, the involute block (409) gradually rotates, and the plastic sample is gradually pressurized by the involute block (409) to ensure that the end of the plastic sample is subjected to force during the tensile test. At the same time, when the plastic sample is subjected to a pressure resistance test, the downward pressure of the upper movable clamping plate (201) will further increase the force on the end of the plastic sample; Step 6: After the pressure and tensile tests are completed, the electric cylinder (9) and the hydraulic cylinder (7) are turned off and reset, and the plastic sample is taken out to observe the cracks on the surface of the plastic sample to obtain the final results.

10. The method for detecting cracks in plastic specimens of baby strollers according to claim 9, characterized in that: Step 6: when the electric cylinder (9) and the hydraulic cylinder (7) are closed and reset, the hydraulic cylinder (7) is reset first, so that all plastic samples can be released at once; At the same time, the cutting knife (308) is reset by the first spring (307) and the second spring (309); When only one of the tensile test or the compressive test is required, place the plastic specimen in the appropriate position.

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