Device for testing shear strength of plastic product

Abstract

The invention discloses a plastic product anti-shearing strength testing device, and relates to the technical field of plastic product testing, the plastic product anti-shearing strength testing device comprises a detection platform, the upper surface of the detection platform is provided with a feeding mechanism, the top of the feeding mechanism is provided with a pressing detection mechanism, the bottom of the pressing detection mechanism is provided with a pressure bearing plate, and the pressure bearing plate is provided with a clamping mechanism. And a positioning mechanism is arranged in the downward pressing detection mechanism, and a plastic rod piece is clamped at the bottom of the positioning mechanism. Through the arrangement of the feeding mechanism and the positioning mechanism, a user can conveniently carry out multi-point detection on plastic products, the detection data collection efficiency of the user is improved, the data collection accuracy is improved, the horizontal position of a supporting roller is adjusted through an electric linear guide rail, and after a plastic rod piece is placed on the supporting roller, the detection accuracy is improved. The motor at one end of the central shaft rod of the supporting roller is started to push the plastic rod piece to horizontally move, the position of a to-be-sheared detection point of the plastic rod piece is adjusted, and the automation degree of the device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic product testing, in particular to a plastic product shear strength testing device. Background Art

[0002] Plastic products are a general term for daily and industrial products made of plastic as the main raw material. Plastic is a material that uses natural or synthetic resin as the main component and various additives. It can be molded into a certain shape under certain temperature and pressure conditions and maintains the same shape at room temperature. Before using plastic products, it is necessary to test the shear strength of plastic products.

[0003] When conducting a shear strength test on a plastic rod, due to the easy bending of the plastic rod, when a shear test is conducted on the cross section of the plastic rod through a detection device, the bending of the plastic rod affects the numerical accuracy of the detection device for the shear strength of the plastic rod, reduces the detection accuracy of the existing device, increases the difficulty of the existing device for shear strength testing of multiple points of the plastic rod, and reduces the work efficiency of the user in multi-point detection of the rod. Therefore, a shear strength testing device for plastic products is introduced. Summary of the invention

[0004] The object of the present invention is to provide a device for testing the shear strength of plastic products to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A plastic product shear strength testing device comprises a testing platform, a feeding mechanism is installed on the upper surface of the testing platform, a downward pressure testing mechanism is arranged on the top of the feeding mechanism, a pressure bearing plate is arranged on the bottom of the downward pressure testing mechanism, a positioning mechanism is arranged inside the downward pressure testing mechanism, and a plastic rod is clamped at the bottom of the positioning mechanism; The downward pressure detection mechanism includes a positioning strut, the bottom end of the positioning strut is connected to the detection platform, a top plate is provided at the top of the positioning strut, a lifting cylinder is installed at the bottom of the top plate, a positioning baffle is installed on the bottom output shaft of the lifting cylinder, a hydraulic cylinder is installed on the upper surface of the positioning baffle, a cutter head is connected to the bottom end of the hydraulic cylinder, and the cutter head is located vertically above the pressure-bearing plate.

[0006] The feeding mechanism includes an electric linear rail, the bottom of which is fixedly connected to the upper surface of the detection platform, a support roller is arranged on the top of the electric linear rail, a motor is connected to the central shaft of the support roller, and the outer wall of the support roller is connected to the plastic rod. The horizontal position of the support roller is adjusted by starting the electric linear rail, and after the plastic rod is placed on the support roller, the motor at one end of the central shaft of the support roller is started to push the plastic rod to move horizontally, and the position of the plastic rod to be sheared and detected is adjusted, thereby improving the degree of automation of the device.

[0007] The upper surface of the pressure plate is provided with a through hole, the size of the cutter head matches the through hole on the upper surface of the pressure plate, the positioning baffle is movably connected to the positioning support rod, and the bottom of the positioning baffle is connected to the positioning mechanism. The telescopic lifting cylinder drives the positioning baffle to move vertically up and down along the positioning support rod, and the height of the positioning mechanism at the bottom of the positioning baffle is adjusted. The positioning mechanism cooperates with the feeding mechanism at the bottom to clamp and position the plastic rod according to the cross-sectional size, thereby improving the applicability of the device.

[0008] The positioning mechanism includes a rotating plate, the top of which is hinged to the bottom of the positioning baffle, a push rod is hinged to the center point of the rotating plate, one end of the push rod is hinged to a limited slide groove, a spring is installed on the inner wall of the limited slide groove, one end of the push rod is movably engaged with the slide groove of the inner wall of the limited slide groove, and a pressure sensor is installed on one end of the spring. The plastic rod is placed on the feeding mechanism, and the plastic rod is conveyed by rotating the supporting roller. While the plastic rod is moved horizontally, the downward pressure detection mechanism is lowered by extending the lifting cylinder, so that the positioning mechanism at the bottom of the positioning baffle is fitted with the plastic rod. When there is a bend on the plastic rod, the rotating plate is pushed to deflect, and at the same time, the spring on the inner wall of the limited slide groove is squeezed by the push rod to generate an extrusion electrical signal for the pressure sensor, and the bending point of the plastic rod is detected, thereby improving the data accuracy of the device for detecting the plastic rod.

[0009] The bottom end of the rotating plate is hinged with a leveling mechanism, and the leveling mechanism includes a supporting side plate, the top of the supporting side plate is hinged with the bottom of the rotating plate, a central rotating shaft is installed on one side of the supporting side plate, one end of the central rotating shaft is sleeved with an oil-receiving rubber-plastic roller, an arc spring is installed at the center point of the central rotating shaft, a toothed ring is fixedly arranged on the inner wall of the rubber-plastic roller, one side of the arc spring is clamped with the tooth block of the toothed ring, two arc springs are arranged, and the two arc springs are equidistantly distributed in a ring around the outer wall of the central rotating shaft. After the leveling mechanism is pressed down by the lifting cylinder, the rubber-plastic roller in the leveling mechanism fits the surface of the plastic rod, and the rubber-plastic roller rolls horizontally along the surface of the plastic rod. Inside the rubber-plastic roller, the arc spring rotates around the outer wall of the toothed ring. Due to the arc setting of the arc spring, the reverse rotation of the rubber-plastic roller is limited, and the shrinkage and bending of the plastic rod caused by the downward pressure and shearing of the surface of the plastic rod by the cutter head is avoided, thereby improving the accuracy of the detection data of the device.

[0010] The feeding mechanism is provided with two, and the two feeding mechanisms are symmetrically arranged on both sides of the detection platform. The supporting rollers are provided with four, and the four supporting rollers are arranged as concave rollers. The horizontal arrangement of the supporting rollers facilitates the user to quickly determine the position of the plastic rod on the feeding mechanism, and the horizontal position of the supporting roller is adjusted by the electric linear rail according to the length of the plastic rod to be detected, thereby improving the applicability of the device, and the supporting roller is rotated to quickly adjust the position of the plastic rod on the supporting roller, so that the user can quickly test the plastic rod at multiple points and collect multiple data.

[0011] A pressure sensing device is arranged between the bottom of the cutter head and the hydraulic cylinder.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. Through the setting of the feeding mechanism and the positioning mechanism, it is convenient for users to detect multiple points of plastic products, improve the efficiency of users in collecting detection data, and improve the accuracy of data collection. The horizontal position of the support roller is adjusted by the electric linear rail. After the plastic rod is placed on the support roller, the motor at one end of the central axis of the support roller is started to push the plastic rod to move horizontally, adjust the position of the plastic rod to be sheared and detected, and improve the degree of automation of the device.

[0013] 2. Through the setting of the feeding mechanism, the downward pressure detection mechanism and the positioning mechanism, the straightness of the surface of the plastic products is detected while the plastic products are being transmitted, so as to ensure the horizontal quality of the points to be detected and avoid the influence of the bending of the plastic rods on the detection data. The plastic rods are placed on the feeding mechanism, and the plastic rods are transported by rotating the supporting rollers. The downward pressure detection mechanism descends by extending the lifting cylinder. When there is a bend on the plastic rod, the rotating plate is pushed to deflect. At the same time, the spring on the inner wall of the limit slide is squeezed by the push rod to generate an extrusion electrical signal for the pressure sensor, and the bending point of the plastic rod is detected, thereby improving the data accuracy of the device for plastic rod detection.

[0014] 3. Through the setting of the feeding mechanism, the downward pressure detection mechanism and the leveling mechanism, the problem of shrinkage of the plastic rod after positioning and fixing is avoided. The support roller is horizontally moved by the electric linear rail to horizontally stretch the plastic rod, which is convenient for the user to correct the bending point on the plastic rod. The rubber-plastic roller fits the surface of the plastic rod and rolls horizontally along the surface of the plastic rod. Inside the rubber-plastic roller, the arc spring rotates around the outer wall of the gear ring. The arc spring limits the reverse rotation of the rubber-plastic roller, avoiding the shrinkage and bending of the plastic rod caused by the downward pressure and shearing of the cutter head on the surface of the plastic rod, thereby further improving the accuracy of the detection data of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a front view structural schematic diagram of the present invention; Figure 3 It is a side structural schematic diagram of the present invention; Figure 4 It is a front cross-sectional structural schematic diagram of the present invention; Figure 5 It is a schematic diagram of the structure of the leveling mechanism of the present invention; Figure 6 It is a schematic diagram of the front view structure of the leveling mechanism of the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of the leveling mechanism of the present invention; Figure 8 The present invention Figure 7 Enlarged structural diagram at A in the middle.

[0016] In the figure: 1. Testing platform; 2. Feeding mechanism; 201. Electric linear rail; 202. Support roller; 3. Downward pressure detection mechanism; 301. Positioning support rod; 302. Top plate; 303. Lifting cylinder; 304. Positioning baffle; 305. Hydraulic cylinder; 306. Cutting head; 4. Pressure-bearing plates; 5. Positioning mechanism; 501. Rotating plate; 502. Push rod; 503. Limiting slide; 504. Leveling mechanism; 5041. Support side plate; 5042. Center shaft; 5043. Rubber-plastic roller; 5044. Arc spring; 5045. Gear ring 6. Plastic rods. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-Figure 8 , the present invention provides a technical solution: A plastic product shear strength testing device comprises a testing platform 1, a feeding mechanism 2 is installed on the upper surface of the testing platform 1, a downward pressure testing mechanism 3 is arranged on the top of the feeding mechanism 2, a pressure bearing plate 4 is arranged at the bottom of the downward pressure testing mechanism 3, a positioning mechanism 5 is arranged inside the downward pressure testing mechanism 3, and a plastic rod 6 is clamped at the bottom of the positioning mechanism 5; The downward pressure detection mechanism 3 includes a positioning strut 301, the bottom end of the positioning strut 301 is connected to the detection platform 1, a top plate 302 is arranged at the top of the positioning strut 301, a lifting cylinder 303 is installed at the bottom of the top plate 302, a positioning baffle 304 is installed at the bottom output shaft of the lifting cylinder 303, a hydraulic cylinder 305 is installed on the upper surface of the positioning baffle 304, a cutter head 306 is connected to the bottom end of the hydraulic cylinder 305, and the cutter head 306 is located vertically above the pressure plate 4.

[0019] The feeding mechanism 2 includes an electric linear rail 201, the bottom of which is fixedly connected to the upper surface of the detection platform 1, and a support roller 202 is arranged on the top of the electric linear rail 201. The central shaft of the support roller 202 is connected to a motor, and the outer wall of the support roller 202 is connected to the plastic rod 6. The horizontal position of the support roller 202 is adjusted by starting the electric linear rail 201, and after the plastic rod 6 is placed on the support roller 202, the motor at one end of the central shaft of the support roller 202 is started to push the plastic rod 6 to move horizontally, and the position of the plastic rod 6 to be sheared and detected is adjusted, thereby improving the degree of automation of the device.

[0020] A through hole is provided on the upper surface of the pressure plate 4, and the size of the cutter head 306 matches that of the through hole on the upper surface of the pressure plate 4. The positioning baffle 304 is movably connected to the positioning support rod 301, and the bottom of the positioning baffle 304 is connected to the positioning mechanism 5. The telescopic lifting cylinder 303 drives the positioning baffle 304 to move vertically up and down along the positioning support rod 301, and adjusts the height of the positioning mechanism 5 at the bottom of the positioning baffle 304. The positioning mechanism 5 cooperates with the feeding mechanism 2 at the bottom to clamp and position the plastic rod 6 according to the cross-sectional size, thereby improving the applicability of the device.

[0021] The positioning mechanism 5 includes a rotating plate 501, the top of the rotating plate 501 is hinged to the bottom of the positioning baffle 304, the center point of the rotating plate 501 is hinged with a push rod 502, one end of the push rod 502 is hinged to a limiting slide groove 503, the inner wall of the limiting slide groove 503 is installed with a spring, one end of the push rod 502 is movably engaged with the slide groove of the inner wall of the limiting slide groove 503, and one end of the spring is installed with a pressure sensor. The plastic rod 6 is placed on the feeding mechanism 2, and the plastic rod 6 is conveyed by rotating the supporting roller 202. While the plastic rod 6 is moved horizontally, the downward pressure detection mechanism 3 descends by extending the lifting cylinder 303, so that the positioning mechanism 5 at the bottom of the positioning baffle 304 fits with the plastic rod 6. When there is a bend on the plastic rod 6, the rotating plate 501 is pushed to deflect, and at the same time, the spring on the inner wall of the limiting slide groove 503 is squeezed by the push rod 502, and an extrusion electrical signal is generated for the pressure sensor, and the bending point of the plastic rod 6 is detected, thereby improving the data accuracy of the device for detecting the plastic rod 6.

[0022] A leveling mechanism 504 is hinged at the bottom end of the rotating plate 501, and the leveling mechanism 504 includes a supporting side plate 5041. The top of the supporting side plate 5041 is hinged to the bottom of the rotating plate 501, and a central rotating shaft 5042 is installed on one side of the supporting side plate 5041. One end of the central rotating shaft 5042 is sleeved with an oil-receiving rubber-plastic roller 5043, and an arc-shaped spring leaf 5044 is installed at the center point of the central rotating shaft 5042. A gear ring 5045 is fixedly provided on the inner wall of the rubber-plastic roller 5043, and one side of the arc-shaped spring leaf 5044 is clamped with the tooth block of the gear ring 5045. There are two arc-shaped spring leaves 5044, and the two arc-shaped spring leaves 5044 are equidistantly distributed in a ring about the outer wall of the central rotating shaft 5042. After the leveling mechanism 504 is pressed down by the lifting cylinder 303, the rubber-plastic roller 5043 in the leveling mechanism 504 fits with the surface of the plastic rod 6, and at the same time, the rubber-plastic roller 5043 rolls horizontally along the surface of the plastic rod 6. Inside the rubber-plastic roller 5043, the arc-shaped spring leaf 5044 rotates around the outer wall of the gear ring 5045. Due to the arc-shaped setting of the arc-shaped spring leaf 5044, the reverse rotation of the rubber-plastic roller 5043 is limited, thereby preventing the cutter head 306 from pressing down on the surface of the plastic rod 6 to shear and cause the plastic rod 6 to shrink and bend, thereby improving the accuracy of the detection data of the device.

[0023] There are two feeding mechanisms 2, which are symmetrically arranged on both sides of the detection platform 1. There are four supporting rollers 202, which are arranged as concave rollers. The horizontal arrangement of the supporting rollers 202 facilitates the user to quickly determine the position of the plastic rod 6 on the feeding mechanism 2. According to the length of the plastic rod 6 to be detected, the horizontal position of the supporting roller 202 is adjusted by the electric linear rail 201, thereby improving the applicability of the device. The supporting roller 202 is rotated to quickly adjust the position of the plastic rod 6 on the supporting roller 202, thereby facilitating the user to quickly test multiple points of the plastic rod 6 and collect various data.

[0024] A pressure sensing device is provided between the bottom of the cutter head 306 and the hydraulic cylinder 305 .

[0025] Working principle of the present invention: First, the plastic rod 6 to be tested for shear strength is placed on the upper surface of the support roller 202, and the horizontal position of the support roller 202 is adjusted by starting the electric linear rail 201. After the plastic rod 6 is placed on the support roller 202, the motor at one end of the central shaft of the support roller 202 is started to push the plastic rod 6 to move horizontally, and the position of the plastic rod 6 to be sheared is adjusted. The telescopic lifting cylinder 303 drives the positioning baffle 304 to move vertically up and down along the positioning support rod 301, and adjusts the height of the positioning mechanism 5 at the bottom of the positioning baffle 304. The positioning mechanism 5 cooperates with the feeding mechanism 2 at the bottom to clamp and position the plastic rod 6 according to the cross-sectional size. The plastic rod 6 is placed on the feeding mechanism 2, and the plastic rod 6 is conveyed by rotating the supporting roller 202. While the plastic rod 6 is horizontally moved, the downward pressure detection mechanism 3 is lowered by extending the lifting cylinder 303, so that the positioning mechanism 5 at the bottom of the positioning baffle 304 is in contact with the plastic rod 6. When there is a bend on the plastic rod 6, the rotating plate 501 is pushed to deflect, and at the same time, the spring on the inner wall of the limiting slide groove 503 is squeezed by the push rod 502, and an extrusion electrical signal is generated for the pressure sensor, and the bending point of the plastic rod 6 is detected; After the leveling mechanism 504 is pressed down by the lifting cylinder 303, the rubber-plastic roller 5043 in the leveling mechanism 504 fits with the surface of the plastic rod 6, and at the same time, the rubber-plastic roller 5043 rolls horizontally along the surface of the plastic rod 6. Inside the rubber-plastic roller 5043, the arc-shaped spring piece 5044 rotates around the outer wall of the gear ring 5045. Due to the arc setting of the arc-shaped spring piece 5044, the reverse rotation of the rubber-plastic roller 5043 is restricted, so as to avoid the cutter head 306 pressing down on the surface of the plastic rod 6 to shear and cause the plastic rod 6 to shrink and bend, thereby improving the accuracy of the detection data of the device; The horizontal setting of the support roller 202 facilitates the user to quickly determine the position of the plastic rod 6 on the feeding mechanism 2. According to the length of the plastic rod 6 to be tested, the horizontal position of the support roller 202 is adjusted by the electric linear rail 201, thereby improving the applicability of the device. The support roller 202 is rotated to quickly adjust the position of the plastic rod 6 on the support roller 202, thereby facilitating the user to quickly test multiple points of the plastic rod 6 and collect multiple data. The flat point on the plastic rod 6 is detected, and the detection mechanism 3 is continuously lowered and pressed down. The cutter head 306 performs a shear test on the plastic rod 6. The pressure-bearing plate 4 supports the bottom of the plastic rod 6. The shear strength data of the plastic rod 6 is obtained through the pressure-sensing device on the top of the cutter head 306. The detection mechanism 3 is raised and pressed down, and the support roller 202 is rotated to horizontally transport the plastic rod 6. Other points of the plastic rod 6 are quickly detected to improve the working efficiency of the device.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic product shear strength testing device, characterized in that: The detection platform (1) comprises a testing platform (1), a feeding mechanism (2) being installed on the upper surface of the testing platform (1), a downward pressure testing mechanism (3) being arranged on the top of the feeding mechanism (2), a pressure bearing plate (4) being arranged on the bottom of the downward pressure testing mechanism (3), a positioning mechanism (5) being arranged inside the downward pressure testing mechanism (3), and a plastic rod (6) being clamped at the bottom of the positioning mechanism (5); The downward pressure detection mechanism (3) comprises a positioning support rod (301), the bottom end of the positioning support rod (301) is connected to the detection platform (1), a top plate (302) is arranged at the top end of the positioning support rod (301), a lifting cylinder (303) is installed at the bottom of the top plate (302), a positioning baffle (304) is installed on the bottom output shaft of the lifting cylinder (303), a hydraulic cylinder (305) is installed on the upper surface of the positioning baffle (304), the bottom end of the hydraulic cylinder (305) is connected to a cutter head (306), and the cutter head (306) is located vertically directly above the pressure-bearing plate (4).

2. A plastic product shear strength testing device according to claim 1, characterized in that: The feeding mechanism (2) comprises an electric linear rail (201), the bottom of the electric linear rail (201) being fixedly connected to the upper surface of the detection platform (1), the top of the electric linear rail (201) being provided with a supporting roller (202), the central shaft of the supporting roller (202) being connected to a motor, and the outer wall of the supporting roller (202) being connected to a plastic rod (6).

3. A plastic product shear strength testing device according to claim 1, characterized in that: A through hole is formed on the upper surface of the pressure-bearing plate (4); the cutter head (306) matches the size of the through hole on the upper surface of the pressure-bearing plate (4); the positioning baffle (304) is movably engaged with the positioning support rod (301); and the bottom of the positioning baffle (304) is connected to the positioning mechanism (5).

4. A plastic product shear strength testing device according to claim 3, characterized in that: The positioning mechanism (5) comprises a rotating plate (501), the top end of the rotating plate (501) is hinged to the bottom of the positioning baffle (304), a push rod (502) is hinged to the center point of the rotating plate (501), one end of the push rod (502) is hinged to a limiting slide groove (503), a spring is installed on the inner wall of the limiting slide groove (503), one end of the push rod (502) is movably engaged with the slide groove on the inner wall of the limiting slide groove (503), and one end of the spring is installed with a pressure sensor.

5. A plastic product shear strength testing device according to claim 4, characterized in that: A leveling mechanism (504) is hingedly connected to the bottom end of the rotating plate (501), and the leveling mechanism (504) comprises a supporting side plate (5041). The top of the supporting side plate (5041) is hingedly connected to the bottom of the rotating plate (501). A central rotating shaft (5042) is installed on one side of the supporting side plate (5041). One end of the central rotating shaft (5042) is sleeved with an oil-receiving rubber-plastic roller (5043). An arc-shaped spring leaf (5044) is installed at the center point of the central rotating shaft (5042). A toothed ring (5045) is fixedly provided on the inner wall of the rubber-plastic roller (5043). One side of the arc-shaped spring leaf (5044) is clamped with a tooth block of the toothed ring (5045). Two arc-shaped spring leaves (5044) are provided, and the two arc-shaped spring leaves (5044) are equidistantly distributed in a ring shape about the outer wall of the central rotating shaft (5042).

6. A plastic product shear strength testing device according to claim 1, characterized in that: Two feeding mechanisms (2) are provided, and the two feeding mechanisms (2) are symmetrically arranged on both sides of the detection platform (1). Four supporting rollers (202) are provided, and the four supporting rollers (202) are arranged as concave rollers.

7. A plastic product shear strength testing device according to claim 1, characterized in that: A pressure sensing device is provided between the bottom of the cutter head (306) and the hydraulic cylinder (305).

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