An apparatus and method for detecting cracks in plastic specimens of a baby stroller

Abstract

The present invention discloses a crack detection device and method for a plastic sample of a baby stroller, which relates to the field of crack detection of plastic samples. It includes a bottom plate, on the upper end of which an upper moving clamping plate and a lower moving clamping plate are movably arranged. The upper moving clamping plate is above the lower moving clamping plate, and the upper moving clamping plate and the lower moving clamping plate are arranged in the same plane. One end of the lower moving clamping plate is fixedly provided with a first conical plate. A rectangular groove is formed inside the upper moving clamping plate, and a driving rod is movably arranged inside the rectangular groove. One end of the driving rod movably extends out of the upper moving clamping plate, and a limiting sleeve is fixedly arranged at the end of the upper moving clamping plate. Through the installation method and positional relationship of the upper moving clamping plate, the lower moving clamping plate, the upper fixed clamping plate and the lower fixed clamping plate, when performing the compression resistance and tensile resistance tests on the plastic sample, the two test methods can be carried out simultaneously, which is convenient for quickly detecting cracks in the plastic sample, so as to achieve the effect of improving the detection speed.

Description

Technical Field

[0001] The present invention relates to the field of crack detection of plastic specimens, and particularly to a crack detection device and method for plastic specimens of baby strollers. Background Art

[0002] Baby strollers are common tools in reality and are mainly used for babies to ride. When baby strollers are produced, they mainly involve aspects such as materials, design, functions, and safety. Common materials for the frame include stainless steel pipes, aluminum alloys, etc. The seats focus on materials with good air permeability and sweat absorption, 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 elements, combines morphological beauty with functionality, and provides a more convenient, safe, and comfortable travel experience for babies. Safety is an important consideration for baby strollers, including designs such as five-point seat belts and double safety locks to ensure the safety of babies during travel; after retrieval, a patent named a plastic specimen crack detection device (patent application number: CN202220949958.5) includes a support base, a power member, a first clamp, a second clamp, and a detection component. The power member is fixedly installed on the support base, the first clamp is installed on the support base, the second clamp is installed on the power output part of the power member, the detection component is installed on the support base, and the detection part of the detection component faces the connection line between the first clamp and the second clamp. By real-time detection of the crack propagation rate of the plastic specimen, the remaining service life of the corresponding pipeline of the specimen is predicted;

[0003] Among them, when baby strollers are produced, their frames are generally composed of metal parts and plastic parts. And through the above patent, it is known that when plastic parts are produced, generally strength tests such as tensile resistance and compressive resistance are carried out on the plastic parts to ensure the structural firmness of the baby stroller. When detecting the rubber of plastic parts, generally various detection methods are required to observe the surface cracks of the plastic parts, so as to observe the basic strength of the plastic specimen. When detecting tensile resistance and compressive resistance, different devices are required for detection, which results in more detection devices being used, affecting the detection speed, and the need for multiple clamping of the test specimen; Therefore, it is very necessary to propose a crack detection device and method for plastic specimens of baby strollers to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a crack detection device and method for plastic specimens of baby strollers to solve the problem of slow detection speed of plastic specimens.

[0005] To achieve the above object, the present invention provides the following technical solution: An apparatus for detecting cracks in plastic specimens of baby strollers, comprising a bottom plate, on the upper end of which an upper moving clamping plate and a lower moving clamping plate are movably provided. The upper moving clamping plate is above the lower moving clamping plate, and the upper moving clamping plate and the lower moving clamping plate are arranged in the same plane.

[0006] One end of the lower moving clamping plate is fixedly provided with a first conical plate. A rectangular groove is formed inside the upper moving clamping plate, and a driving rod is movably arranged inside the rectangular groove. One end of the driving rod movably extends out of the upper moving clamping plate, and a limiting sleeve is fixedly provided at the end of the upper moving clamping plate.

[0007] A second conical plate is fixedly provided at the lower end of the driving rod. A knife storage groove is formed at the lower end of the upper moving clamping plate, and a cutting knife is movably arranged up and down inside the knife storage groove.

[0008] The first conical plate abuts against the outer side of the driving rod, and the second conical plate abuts against the cutting knife.

[0009] Preferably, an inner cavity groove is formed inside the lower moving clamping plate, and a central shaft is rotatably arranged inside the lower moving clamping plate. A sector plate and an involute block are fixedly provided on the outer side of the central shaft. An involute auxiliary positioning groove is formed in the middle of the outer side of the involute block. A plane auxiliary positioning groove is formed at the lower end of the upper moving clamping plate, and the plane auxiliary positioning groove and the involute auxiliary positioning groove are in the same vertical plane.

[0010] 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 on both sides of the upper end of the cutting knife, and the ends of the second springs are fixedly connected to the inner wall of the knife storage groove.

[0011] A tool withdrawal groove for the cutting knife to enter is formed at the upper end of the lower moving clamping plate.

[0012] Preferably, two gear grooves are formed at the upper end of the bottom plate, a gear plate is fixedly provided inside the gear grooves, and a plurality of fixed tooth blocks are fixedly provided on the upper end of the gear plate. The plurality of fixed tooth blocks are arranged in a linear array.

[0013] The outer surface of the sector plate is arc-shaped, and a plurality of moving tooth blocks are fixedly provided on the arc surface of the sector plate. The plurality of moving tooth blocks are arranged in a curve array, and the moving tooth blocks and the fixed tooth blocks are meshed with each other.

[0014] 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 hemispherical.

[0015] Preferably, a hydraulic frame is fixedly provided at the upper end of the base plate. A hydraulic cylinder is fixedly provided at the upper end of the hydraulic frame. A pressing plate is movably provided inside the hydraulic frame. The output end of the hydraulic cylinder is fixedly connected to the upper end of the pressing plate.

[0016] A guiding plate is fixedly provided at the lower end of the pressing plate. An upper fixing clamp plate and a lower fixing clamp plate are provided above the base plate. The lower fixing clamp plate is fixedly installed at the upper end of the base plate. Guiding blocks are fixedly provided at the upper ends of both the upper fixing clamp plate and the upper moving clamp plate. The guiding blocks slide inside the guiding plate. A transition fit is formed between the guiding blocks and the guiding plate. The guiding plate and the guiding blocks are connected in an inwardly buckled manner.

[0017] Pressure sensors are fixedly provided on the opposite surfaces of the upper fixing clamp plate and the upper moving clamp plate.

[0018] Preferably, a sunken groove is formed at the upper end of the base plate. An electric cylinder is fixedly provided inside the sunken groove. A tension sensor is fixedly provided at the end of the lower moving clamp plate corresponding to the electric cylinder. The output end of the electric cylinder is fixedly connected to the tension sensor.

[0019] Preferably, the cross-sections of both the plane auxiliary positioning groove and the involute auxiliary positioning groove are arranged with an arc-shaped opening.

[0020] The present invention also discloses a method for detecting cracks in a plastic sample of a baby stroller, which specifically includes the following steps:

[0021] Step 1: Cut the plastic sample to an appropriate length. Then place one end of the plastic sample between the upper moving clamp plate and the lower moving clamp plate, and place the other end of the plastic sample between the upper fixing clamp plate and the lower fixing clamp plate, so that the plastic sample between the upper moving clamp plate and the lower moving clamp plate is placed between the plane auxiliary positioning groove and the involute auxiliary positioning groove to align the plastic sample and ensure that the plastic sample is at the center of the upper moving clamp plate and the lower moving clamp plate to complete the preliminary placement of the plastic sample.

[0022] Step 2: First, start the hydraulic cylinder to fix the plastic sample through the hydraulic cylinder, so that the upper moving clamp plate moves towards the lower fixing clamp plate, and the upper fixing clamp plate moves towards the lower fixing clamp 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 received by the plastic sample when it is squeezed.

[0023] Step 3: The upper moving clamp plate gradually moves towards the plastic sample. At the same time, automatically control the cutting knife to cut the plastic sample. At the same time, the upper moving clamp plate can press both sections of the cut plastic sample for subsequent tensile strength tests.

[0024] Step 4: After cutting the plastic specimen with a cutting knife, start the electric cylinder to conduct a tensile strength test on the plastic specimen, making the upper moving clamping plate gradually move away from the upper fixed clamping plate. Detect the tensile force through a tensile force sensor. By cutting the plastic specimen, it can prevent the tensile strength test from affecting the compressive strength test when conducting the tensile strength and compressive strength tests on the plastic specimen, enabling the tensile strength and compressive strength tests to be carried out simultaneously;

[0025] Step 5: When the upper moving clamping plate is driven by the electric cylinder, control the involute block to rotate through a sector plate and a gear plate. Due to the shape of the involute block itself, when the upper moving clamping plate gradually moves, the involute block gradually rotates, and the plastic specimen is gradually pressurized through the involute block, ensuring the force on the end of the plastic specimen during the tensile strength test. At the same time, when the plastic specimen undergoes a compressive strength test, the downward pressure of the upper moving clamping plate will further increase the force on the end of the plastic specimen;

[0026] Step 6: After the compressive strength and tensile strength tests are completed, turn off and reset the electric cylinder and the hydraulic cylinder, take out the plastic specimen, and observe the surface cracks of the plastic specimen to obtain the final result.

[0027] Preferably, in Step 6: When turning off and resetting the electric cylinder and the hydraulic cylinder, first reset the hydraulic cylinder, which can release all the plastic specimens at once, facilitating the priority and rapid removal of the plastic specimens;

[0028] At the same time, reset the cutting knife through the first spring and the second spring, facilitating its next use;

[0029] In addition, when only one of the tensile strength test or the compressive strength test needs to be carried out, just place the plastic specimen at the appropriate corresponding position.

[0030] The technical effects and advantages of the present invention:

[0031] 1. Through the installation method and positional relationship of the upper moving clamping plate, lower moving clamping plate, upper fixed clamping plate, and lower fixed clamping plate, when conducting the compressive strength and tensile strength detections of the plastic specimen, the two detection methods can be carried out simultaneously, facilitating the rapid crack detection of the plastic specimen, so as to achieve the effect of improving the detection speed;

[0032] 2. Through the setting of the cutting knife, when simultaneously conducting two detection methods on the plastic specimen, the cutting knife moves towards the plastic specimen until the plastic specimen is cut, completing the cutting and compressive strength test of the plastic specimen. By cutting the plastic specimen, it can prevent the tensile strength test from affecting the compressive strength test when conducting the tensile strength and compressive strength tests on the plastic specimen, enabling the tensile strength and compressive strength tests to be carried out simultaneously;

[0033] 3. Through the shape and position settings of the first conical plate and the second conical plate, when the upper moving clamping plate moves, the plastic specimen can be automatically cut off. At the same time, the upper moving clamping plate can press all the plastic specimens cut into two sections, which is convenient for subsequent tensile strength tests and compressive strength tests.

[0034] 4. Through the plane auxiliary positioning groove and the involute auxiliary positioning groove, when placing the plastic specimen, ensure that the plastic specimen is directly below the upper moving clamping plate, and ensure that the force during the tensile strength test of the plastic specimen is on the same horizontal line, preventing other additional torques and the like during the test of the plastic specimen.

[0035] 5. Through the plane auxiliary positioning groove and the involute auxiliary positioning groove, when fixing the plastic specimen, due to its shape setting, when clamping the plastic specimen, it can clamp plastic specimens with various plastic diameters and plastic specimens with various shapes, and its application range is wide.

[0036] 6. Through the setting of the involute block, when the plastic specimen is subjected to a tensile strength test, the shape of the involute block and the setting of the sector plate can be used to gradually apply pressure to the plastic specimen, ensuring the force at the end of the plastic specimen during the tensile test. At the same time, when the plastic specimen is subjected to a compressive strength test, the downward pressure of the upper moving clamping plate will further increase the force at the end of the plastic specimen.

[0037] 7. After the test is completed, first reset the hydraulic cylinder to release all the plastic specimens at one time, which is convenient for quickly removing the plastic specimens first. At the same time, when only one of the tensile strength test or the compressive strength test needs to be carried out, only need to place the plastic specimen at the appropriate position and then carry out the detection operation, and its practicability is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural view of one perspective of the plastic specimen crack detection device for a baby stroller according to the present invention.

[0039] Figure 2 It is a schematic structural view of another perspective of the plastic specimen crack detection device for a baby stroller according to the present invention.

[0040] Figure 3 It is a schematic structural view above the bottom plate of the present invention.

[0041] Figure 4 It is a schematic structural view of the positions of the upper moving clamping plate, the lower moving clamping plate, the upper fixed clamping plate and the lower fixed clamping plate of the present invention.

[0042] Figure 5 It is a schematic structural view of the upper moving clamping plate and the lower moving clamping plate of the present invention.

[0043] Figure 6 It is a schematic sectional view of the upper moving clamping plate and the lower moving clamping plate of the present invention.

[0044] Figure 7 This is a schematic cross-sectional view of the upper movable clamping plate of the present invention.

[0045] Figure 8 This is a schematic view of the connection structure of the driving rod of the present invention.

[0046] Figure 9 This is a schematic view of the sector plate structure of the present invention.

[0047] Figure 10 This is a schematic view of the involute block structure of the present invention.

[0048] 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, tool storage groove; 306, second conical plate; 307, first spring; 308, cutting tool; 309, second spring; 310, tool retraction groove; 401, inner cavity groove; 402, central axis; 403, gear groove; 404, gear plate; 405, fixed tooth block; 406, positioning rod; 407, sector plate; 408, movable tooth 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, pressing plate; 9, electric cylinder; 901, sinking groove; 10, pressure sensor; 11, tension sensor. Specific embodiments

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] The present invention provides as Figure 1 - Figure 10An infant stroller plastic sample crack detection device is shown. Before the production of an infant stroller, various tests such as strength tests are generally carried out on its 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 background information such as samples of fractured plastic products and their production, processing, and usage environments. There are various testing techniques, including maximum rupture force testing to evaluate the load-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-resistant rupture testing to detect the durability of packaging materials in actual use. In addition, macroscopic observation is also required to understand the type and possible causes of fractures; microscopic analysis to observe the microscopic structure of the fracture surface; and chemical and physical property testing to deeply understand the reasons for fractures. By combining the above steps and test results, the specific reasons for plastic cracks can be obtained.

[0051] It includes a bottom plate 101. A hydraulic frame 6 is fixedly arranged at the upper end of the bottom plate 101. A hydraulic cylinder 7 is fixedly arranged at the upper end of the hydraulic frame 6. A pressing plate 8 is movably arranged inside the hydraulic frame 6. The hydraulic cylinder 7 is a prior art and is mainly used to drive the pressing plate 8 to move up and down. The hydraulic cylinder 7 is a standard hydraulic cylinder. The cylinder barrel size and weight of the standard hydraulic cylinder: the weight of a cylinder barrel with an inner diameter of 40 mm, an outer diameter of 50 mm, and a length of 500 mm is 2.775 kg. There will be no excessive description here. The output end of the hydraulic cylinder 7 is fixedly connected to the upper end of the pressing plate 8. A sinking groove 901 is opened at the upper end of the bottom plate 101. An electric cylinder 9 is fixedly arranged inside the sinking groove 901. The electric cylinder 9 is mainly used to drive the lower moving clamping plate 202 to move. The electric cylinder 9 is a standard cylinder and is usually used in combination with a lift valve and an electromagnetic pulse valve. These cylinders can work in an ambient temperature range of -5°C to 70°C and can withstand a working pressure of 0.1 to 1 Mpa. The cylinder diameter specification is 125 mm. There will be no excessive description here.

[0052] A tension sensor 11 is fixedly provided at the end of the lower moving 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 works. 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 a physical signal into a measurable electrical signal output. The tension sensor is also called a resistance strain type sensor and belongs to the series of weighing sensors. It uses two tension transmission parts to transmit force. 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 transverse action surface between the two ends. The piezoelectric sheet gasket presses on the central area of the piezoelectric sheet on one side, and the substrate part is located on the other side of the piezoelectric sheet between the edge force transmission part and is in close contact with the piezoelectric sheet. One of its uses is to make a hook scale to replace the steelyard. The actual working environment is crucial for the correct selection of the tension sensor. It not only relates to whether the tension sensor can work normally, its safety and service life, but also the reliability and safety of the entire weighing instrument.

[0053] Pressure sensors 10 are fixedly provided on the corresponding surfaces of the upper fixed clamping plate 203 and the upper moving clamping plate 201. The pressure sensors 10 are mainly used to detect the pressure borne by the plastic specimen. The pressure sensor is a device or apparatus that can sense the weight force signal and convert the pressure signal into a usable output electrical signal according to a certain rule. The specific model is a weighing sensor. The weighed object or the truck is placed on the carrier tabletop. 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. The strain gauge bridge circuit attached to the elastic body loses balance and outputs an electrical signal proportional to the weight value. The signal is amplified by a linear amplifier, then converted into a digital signal by A / D conversion, and the weight signal is processed by the microprocessor of the instrument to directly display the weight data. After configuring a printer, the weighing data can be printed. If a computer is configured, the measurement data can be input into the computer management system for comprehensive management.

[0054] The upper moving clamping plate 201 and the lower moving clamping plate 202 are movably provided at the upper end of the bottom plate 101. The upper moving clamping plate 201 is above the lower moving clamping plate 202. The upper moving clamping plate 201 and the lower moving clamping plate 202 are arranged in the same plane. Cut the plastic specimen to an appropriate length, then place one end of the plastic specimen between the upper moving clamping plate 201 and the lower moving clamping plate 202, and then place the other end of the plastic specimen between the upper fixed clamping plate 203 and the lower fixed clamping plate 204 to ensure the placement of the plastic specimen;

[0055] One end of the lower moving clamping plate 202 is fixedly provided with a first conical plate 301 for pushing the driving rod 303 to move. A rectangular groove 304 is formed inside the upper moving clamping plate 201. The driving rod 303 is movably arranged inside the rectangular groove 304. One end of the driving rod 303 movably extends out of the upper moving clamping plate 201. A limiting sleeve 302 is fixedly arranged at the end of the upper moving clamping plate 201. A second conical plate 306 is fixedly arranged at the lower end of the driving rod 303 for pushing the cutting knife 308 to move downward. A knife storage groove 305 is formed at the lower end of the upper moving clamping plate 201. The cutting knife 308 is movably arranged up and down 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;

[0056] 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. Guide blocks 502 are fixedly arranged at the upper ends of the upper fixed clamping plate 203 and the upper moving clamping plate 201. The guide blocks 502 slide inside the guide plate 501. There is a transitional fit between the guide blocks 502 and the guide plate 501. When the guide blocks 502 are not stressed, it is ensured that the guide blocks 502 are in a static state, and the guide plate 501 and the guide blocks 502 are connected in an inward buckling manner;

[0057] 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, the guide plate 501 drives the guide block 502 to move, and the guide block 502 drives the upper moving clamping plate 201 and the upper fixed clamping plate 203 to move, so that the upper moving clamping plate 201 and the upper fixed clamping plate 203 move towards the lower moving clamping plate 202 and the lower fixed clamping plate 204 to tightly fix the plastic specimen. At the same time, when the upper moving clamping plate 201 moves, it drives the driving rod 303 to move until the driving rod 303 contacts the first conical plate 301. Through the inclined surface of the first conical plate 301, the driving rod 303 moves away from the limiting sleeve 302. The driving rod 303 then drives the second conical plate 306, so that the second conical plate 306, through the limit of its own inclined surface and the knife storage groove 305, makes the cutting knife 308 move towards the plastic specimen until the plastic specimen is cut, so as to complete the cutting and compressive strength test of the plastic specimen;

[0058] After the pressure test is completed, control the first spring 307 to return to its initial state, and through the first spring 307 and the second spring 309, reset the driving rod 303 and the cutting knife 308.

[0059] The upper moving clamping plate 201 gradually moves towards the plastic specimen, and at the same time, automatically control the cutting knife 308 to cut the plastic specimen. At the same time, the upper moving clamping plate 201 can tightly press the two cut plastic specimens, which is convenient for subsequent tensile strength tests.

[0060] One end of the second conical plate 306 is fixedly provided with a first spring 307. The end of the first spring 307 is fixedly connected to the inner wall of the rectangular groove 304. Both sides of the upper end of the cutting knife 308 are fixedly provided with second springs 309. The end of the second spring 309 is fixedly connected to the inner wall of the knife storage groove 305. A tool withdrawal groove 310 for the cutting knife 308 to enter is opened at the upper end of the lower movable clamping plate 202.

[0061] After the plastic specimen is cut by the cutting knife 308, the electric cylinder 9 is started to conduct a tensile strength test on the plastic specimen, so that the upper movable clamping plate 201 gradually moves away from the upper fixed clamping plate 203. The tensile force is detected by the tensile force sensor 11. By cutting the plastic specimen, it is possible to prevent the tensile strength test from affecting the compressive strength test when the plastic specimen is subjected to the tensile strength and compressive strength tests, so that the tensile strength and compressive strength tests are carried out synchronously. When the upper movable clamping plate 201 and the lower movable clamping plate 202 clamp the plastic specimen, the first conical plate 301 is inside the limit sleeve 302. When the electric cylinder 9 drives the lower movable clamping plate 202, it is ensured that the upper movable clamping plate 201 moves following the lower movable clamping plate 202.

[0062] An inner cavity groove 401 is opened on the inner side of the lower movable clamping plate 202. A central shaft 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 shaft 402. There are two sector plates 407. 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. The end of the positioning rod 406 corresponding to the sector plate 407 is arranged in a hemispherical shape. The positioning rod 406 is mainly used to resist the sector plate 407. An involute auxiliary positioning groove 411 is opened in the middle of the outer side of the involute block 409. A plane auxiliary positioning groove 410 is opened 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. The cross-sections of the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411 are both arranged with an arc-shaped opening, which is convenient for clamping the plastic specimen between the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411;

[0063] Through the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411, when fixing the plastic specimen, due to its shape setting, when clamping the plastic specimen, it is possible to clamp plastic specimens with various plastic diameters and various shapes of plastic specimens, and its application range is wide. And through the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411, when placing the plastic specimen, it is ensured that the plastic specimen is directly below the upper movable clamping plate 201, and it is ensured that the force during the tensile strength test of the plastic specimen is on the same horizontal line, preventing other additional torques and the like when the plastic specimen is tested.

[0064] There are two gear slots 403 opened at the upper end of the bottom plate 101. A gear plate 404 is fixedly arranged inside the gear slot 403. A plurality of fixed tooth blocks 405 are fixedly arranged 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 arc-shaped. A plurality of moving tooth blocks 408 are fixedly arranged on the arc surface of the sector plate 407. The plurality of moving tooth blocks 408 are arranged in a curve array. The moving tooth blocks 408 and the fixed tooth blocks 405 mesh with each other.

[0065] Driven by the second spring 309, the lower moving clamp plate 202 moves, causing the lower moving clamp plate 202 to drive the central shaft 402 to move. The central shaft 402 then drives the sector plate 407 to move. Since the sector plate 407 is restricted by the fixed tooth blocks 405 and the moving tooth blocks 408, the sector plate 407 is caused to rotate. The sector plate 407 drives the central shaft 402 to rotate. The central shaft 402 drives the involute block 409 to rotate, causing the involute block 409 to squeeze the plastic specimen through its own shape. When testing the tensile force of the plastic specimen, the clamping force on the plastic specimen is automatically increased synchronously. Through the positioning rod 406, the loosening of the involute block 409 caused by the reset of the sector plate 407 is prevented.

[0066] When the upper moving clamp plate 201 is driven by the electric cylinder 9, the rotation of the involute block 409 is controlled through the sector plate 407 and the gear plate 404. Through the shape of the involute block 409 itself, when the upper moving clamp plate 201 gradually moves, the involute block 409 gradually rotates. The plastic specimen is gradually pressurized through the involute block 409 to ensure the force on the end of the plastic specimen during the tensile test. At the same time, when the plastic specimen is subjected to a compressive strength test, the downward pressure of the upper moving clamp plate 201 will further increase the force on the end of the plastic specimen;

[0067] After the test is completed, first reset the hydraulic cylinder 7, causing the hydraulic cylinder 7 to drive the guide plate 501 to move. The guide plate 501 then drives the guide block 502 to move. The guide block 502 drives the upper moving clamp plate 201 and the upper fixed clamp plate 203 to move, releasing all the plastic specimens at one time, facilitating the priority and rapid removal of the plastic specimens. At the same time, when only one of the tensile strength test or the compressive strength test needs to be performed, only the plastic specimen needs to be placed at the appropriate position and then the detection operation is carried out, and its practicability is relatively high.

[0068] An inspection method for cracks in plastic specimens of a baby stroller is also disclosed in an embodiment of the present invention, which specifically includes the following steps:

[0069] Step 1: Cut the plastic specimen to an appropriate length. Then place one end of the plastic specimen between the upper moving clamping plate 201 and the lower moving clamping plate 202, and place the other end of the plastic specimen between the upper fixed clamping plate 203 and the lower fixed clamping plate 204. Make the plastic specimen between the upper moving clamping plate 201 and the lower moving clamping plate 202 be placed between the plane auxiliary positioning groove 410 and the involute auxiliary positioning groove 411 for aligning the plastic specimen to ensure that the plastic specimen is at the exact center between the upper moving clamping plate 201 and the lower moving clamping plate 202, thus completing the preliminary placement of the plastic specimen.

[0070] Step 2: First, start the hydraulic cylinder 7 to fix the plastic specimen through the hydraulic cylinder 7. Make the upper moving clamping plate 201 move towards the lower fixed clamping plate 204, and the upper fixed clamping plate 203 move towards the lower fixed clamping plate 204 to complete the fixation of the plastic specimen. The hydraulic cylinder 7 continuously applies pressure, and the pressure sensor 10 is used to detect the pressure exerted on the plastic specimen when it is squeezed.

[0071] Step 3: The upper moving clamping plate 201 gradually moves towards the plastic specimen. At the same time, automatically control the cutting knife 308 to cut the plastic specimen. At the same time, the upper moving clamping plate 201 can firmly press both sections of the cut plastic specimen for subsequent tensile strength tests.

[0072] Step 4: After cutting the plastic specimen with the cutting knife 308, start the electric cylinder 9 to conduct a tensile strength test on the plastic specimen. Make the upper moving clamping plate 201 gradually move away from the upper fixed clamping plate 203, and detect the tensile force through the tensile force sensor 11. By cutting the plastic specimen, it can prevent the tensile strength test from affecting the compressive strength test when the plastic specimen is subjected to tensile and compressive strength tests, enabling the tensile and compressive strength tests to be carried out simultaneously.

[0073] Step 5: When the upper moving clamping plate 201 is driven by the electric cylinder 9, control the involute block 409 to rotate through the sector plate 407 and the gear plate 404. Due to the shape of the involute block 409 itself, when the upper moving clamping plate 201 gradually moves, the involute block 409 gradually rotates, and the involute block 409 gradually presses the plastic specimen to ensure the force on the end of the plastic specimen during the tensile strength test. At the same time, when the plastic specimen is subjected to a compressive strength test, the downward pressure of the upper moving clamping plate 201 will further increase the force on the end of the plastic specimen.

[0074] Step 6: After the compressive strength and tensile strength tests are completed, turn off and reset the electric cylinder 9 and the hydraulic cylinder 7, take out the plastic specimen, and observe the surface cracks of the plastic specimen to obtain the final result.

[0075] Among them, in Step 6: When turning off and resetting the electric cylinder 9 and the hydraulic cylinder 7, first reset the hydraulic cylinder 7, which can release all the plastic specimens at once, facilitating the priority and rapid removal of the plastic specimens.

[0076] Meanwhile, the cutting tool 308 is reset by the first spring 307 and the second spring 309, facilitating the next use;

[0077] In addition, when only one of the tensile strength test or the compressive strength test needs to be carried out, it is only necessary to place the plastic specimen at the corresponding appropriate position.

Claims

1. A crack detection device for a plastic specimen of a baby stroller, comprising a bottom plate (101), characterized in that: An upper moving clamping plate (201) and a lower moving clamping plate (202) are movably arranged at the upper end of the bottom plate (101). The upper moving clamping plate (201) is above the lower moving clamping plate (202). The upper moving clamping plate (201) and the lower moving clamping plate (202) are arranged in the same plane. A hydraulic frame (6) is fixedly arranged at the upper end of the bottom plate (101). A hydraulic cylinder (7) is fixedly arranged at the upper end of the hydraulic frame (6). A pressing plate (8) is movably arranged inside the hydraulic frame (6). The output end of the hydraulic cylinder (7) is fixedly connected to the upper end of the pressing plate (8). A sinking groove (901) is formed at the upper end of the bottom plate (101). An electric cylinder (9) is fixedly arranged inside the sinking groove (901). A tension sensor (11) is fixedly arranged at the end of the lower moving clamping plate (202) corresponding to the electric cylinder (9). The output end of the electric cylinder (9) is fixedly connected to the tension sensor (11); A guiding 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). Guiding blocks (502) are fixedly arranged at the upper ends of both the upper fixed clamping plate (203) and the upper moving clamping plate (201). The guiding blocks (502) slide inside the guiding plate (501). There is a transitional fit between the guiding blocks (502) and the guiding plate (501). The guiding plate (501) and the guiding blocks (502) are connected in an inwardly buckled manner; Pressure sensors (10) are fixedly arranged on the opposite surfaces of the upper fixed clamping plate (203) and the upper moving clamping plate (201); A first conical plate (301) is fixedly arranged at one end of the lower moving clamping plate (202). A rectangular groove (304) is formed inside the upper moving clamping plate (201). A driving rod (303) is movably arranged inside the rectangular groove (304). One end of the driving rod (303) movably extends out of the upper moving clamping plate (201). A limiting sleeve (302) is fixedly arranged at the end of the upper moving clamping plate (201); An inner cavity groove (401) is formed inside the lower moving clamping plate (202). A central shaft (402) is rotatably arranged inside the lower moving clamping plate (202). A sector plate (407) and an involute block (409) are fixedly arranged on the outer side of the central shaft (402). An involute auxiliary positioning groove (411) is formed in the middle of the outer side of the involute block (409). A plane auxiliary positioning groove (410) is formed at the lower end of the upper moving clamping plate (201). The plane auxiliary positioning groove (410) and the involute auxiliary positioning groove (411) are in the same vertical plane; A second conical plate (306) is fixedly arranged at the lower end of the driving rod (303). A tool storage groove (305) is formed at the lower end of the upper moving clamping plate (201). A cutting tool (308) is movably arranged up and down inside the tool storage groove (305); The first conical plate (301) abuts against the outer side of the driving rod (303). The second conical plate (306) abuts against the cutting tool (308).

2. The crack detection device for plastic specimens of a baby stroller according to claim 1, characterized in that: One end of the second conical plate (306) is fixedly provided with a first spring (307). The end of the first spring (307) is fixedly connected to the inner wall of the rectangular groove (304). On both sides of the upper end of the cutting knife (308), second springs (309) are fixedly provided. The ends of the second springs (309) are fixedly connected to the inner wall of the knife storage groove (305). A tool withdrawal groove (310) for the cutting knife (308) to enter is formed in the upper end of the lower movable clamping plate (202).

3. The crack detection device for plastic specimens of a baby stroller according to claim 2, characterized in that: Two gear grooves (403) are formed in 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 on 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 arc-shaped. 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. The movable tooth blocks (408) and the fixed tooth blocks (405) are engaged with each other.

4. An infant stroller plastic specimen crack detection device according to claim 3, 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). The end of the positioning rod (406) corresponding to the sector plate (407) is hemispherical.

5. A crack detection device for a plastic specimen of a baby stroller according to claim 4, characterized in that: The cross sections of the plane auxiliary positioning groove (410) and the involute auxiliary positioning groove (411) are both arc-shaped and open.

6. A method for detecting cracks in a plastic specimen of a baby stroller using the baby stroller plastic specimen crack detection device according to claim 4 or 5, characterized in that: Specifically, it includes the following steps: Step 1: Cut the plastic specimen to an appropriate length. Then place one end of the plastic specimen between the upper movable clamping plate (201) and the lower movable clamping plate (202), and place the other end of the plastic specimen between the upper fixed clamping plate (203) and the lower fixed clamping plate (204). Make the plastic specimen between the upper movable clamping plate (201) and the lower movable clamping plate (202) be placed between the plane auxiliary positioning groove (410) and the involute auxiliary positioning groove (411) to align the plastic specimen and ensure that the plastic specimen is at the exact center between the upper movable clamping plate (201) and the lower movable clamping plate (202), so as to complete the preliminary placement of the plastic specimen. Step 2: First, start the hydraulic cylinder (7) to fix the plastic specimen through the hydraulic cylinder (7). Make the upper movable clamping plate (201) move towards the lower fixed clamping plate (204), and the upper fixed clamping plate (203) move towards the lower fixed clamping plate (204) to complete the fixation of the plastic specimen. The hydraulic cylinder (7) continuously applies pressure, and the pressure sensor (10) is used to detect the pressure exerted on the plastic specimen when it is squeezed. Step 3: The upper movable clamping plate (201) gradually moves towards the plastic specimen. At the same time, the cutting knife (308) is automatically controlled to cut the plastic specimen. At the same time, the upper movable clamping plate (201) can tightly press both sections of the cut plastic specimen for subsequent tensile strength tests. Step 4: After cutting the plastic specimen with the cutting knife (308), start the electric cylinder (9) to conduct a tensile strength test on the plastic specimen, causing the upper moving clamping plate (201) to gradually move away from the upper fixed clamping plate (203). Detect the tensile force through the tensile force sensor (11). By cutting the plastic specimen, it can prevent the tensile strength test from affecting the compressive strength test when conducting the tensile strength and compressive strength tests on the plastic specimen, enabling the tensile strength and compressive strength tests to be carried out simultaneously; Step 5: When the upper moving clamping plate (201) is driven by the electric cylinder (9), control the involute block (409) to rotate through the sector plate (407) and the gear plate (404). Due to the shape of the involute block (409) itself, when the upper moving clamping plate (201) gradually moves, the involute block (409) gradually rotates. Pressurize the plastic specimen gradually through the involute block (409) to ensure the force on the end of the plastic specimen during the tensile strength test. At the same time, when the plastic specimen is subjected to the compressive strength test, the downward pressure of the upper moving clamping plate (201) will further increase the force on the end of the plastic specimen; Step 6: After the compressive strength and tensile strength tests are completed, turn off and reset the electric cylinder (9) and the hydraulic cylinder (7), take out the plastic specimen, observe the surface cracks of the plastic specimen, and obtain the final result.

7. The method for detecting cracks in a plastic specimen of a baby stroller according to claim 6, characterized in that: In the said Step 6: When turning off and resetting the electric cylinder (9) and the hydraulic cylinder (7), first reset the hydraulic cylinder (7), and all the plastic specimens can be released at one time; At the same time, reset the cutting knife (308) through the first spring (307) and the second spring (309); When only one of the tensile strength test or the compressive strength test needs to be carried out, place the plastic specimen at the corresponding appropriate position.

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