A Shear Strength Testing Device for Plastic Products

Abstract

The present invention discloses a shear strength testing device for plastic products, which relates to the technical field of plastic product testing. It includes a detection platform, on the upper surface of which a feeding mechanism is installed. At the top of the feeding mechanism, there is a downward pressing detection mechanism. At the bottom of the downward pressing detection mechanism, there is a bearing plate member. Inside the downward pressing detection mechanism, there is a positioning mechanism, and a plastic rod is clamped at the bottom of the positioning mechanism. Through the setting of the feeding mechanism and the positioning mechanism, it is convenient for the user to perform multi-point detection on plastic products, improve the efficiency of the user in collecting detection data, and improve the accuracy of data collection. By adjusting the horizontal position of the support roller through an electric linear rail, after placing the plastic rod on the support roller, start the motor at one end of the central shaft of the support roller to push the plastic rod to move horizontally and adjust the position of the plastic rod at the point to be sheared and detected, thereby improving the automation degree of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic product testing, and particularly to a device for testing the shear strength of plastic products. Background Art

[0002] Plastic products are a general term for daily necessities, industrial products, etc. processed mainly with plastics. Plastics are materials mainly composed of natural or synthetic resins, added with various additives, which can be molded into a certain shape under certain conditions such as temperature and pressure, and keep the shape unchanged at normal temperature. Before using plastic products, it is necessary to test the shear strength of plastic products.

[0003] When testing the shear strength of plastic rods, due to the easy bendability of plastic rods, when the cross-section of the plastic rod is sheared by a detection device, the bending of the plastic rod affects the numerical accuracy of the shear resistance of the plastic rod by the detection device, reduces the detection accuracy of the existing device, increases the difficulty of testing the shear strength of multiple positions of the plastic rod by the existing device, and reduces the working efficiency of the user for detecting multiple positions of the rod. Therefore, a device for testing the shear strength of plastic products is introduced. Summary of the Invention

[0004] The purpose 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 art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A device for testing the shear strength of plastic products includes a detection platform. A feeding mechanism is installed on the upper surface of the detection platform. A downward pressing detection mechanism is arranged on the top of the feeding mechanism. A bearing plate member is arranged at the bottom of the downward pressing detection mechanism. A positioning mechanism is arranged inside the downward pressing detection mechanism. A plastic rod is clamped at the bottom of the positioning mechanism;

[0007] The downward pressing detection mechanism includes a positioning support rod. The bottom end of the positioning support rod is connected to the detection platform. The top end of the positioning support rod is provided with a top plate. A lifting cylinder is installed at the bottom of the top plate. The bottom output shaft of the lifting cylinder is installed with a positioning baffle. A hydraulic cylinder is installed on the upper surface of the positioning baffle. The bottom end of the hydraulic cylinder is connected with a cutter head. The cutter head is located directly above the bearing plate member in the vertical direction.

[0008] The feeding mechanism includes an electric linear guide. The bottom of the electric linear guide is fixedly connected to the upper surface of the detection platform. A support roller is arranged at the top of the electric linear guide. A motor is connected to the central shaft of the support roller, and the outer wall of the support roller is connected to a plastic rod. By starting the electric linear guide to adjust the horizontal position of the support roller, after placing the plastic rod on the support roller, start the motor at one end of the central shaft of the support roller to push the plastic rod to move horizontally, adjust the position of the point to be sheared and detected on the plastic rod, and improve the automation degree of the device.

[0009] Through holes are formed on the upper surface of the bearing plate member. The cutter head matches the size of the through holes on the upper surface of the bearing plate member. The positioning baffle is movably clamped with 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, adjusts the height of the positioning mechanism at the bottom of the positioning baffle, and the positioning mechanism cooperates with the feeding mechanism at the bottom to clamp and position according to the cross-sectional size of the plastic rod, improving the applicability of the device.

[0010] The positioning mechanism includes a rotating plate. The top end of the rotating plate is hinged to the bottom of the positioning baffle. A push rod is hinged at the center point of the rotating plate. One end of the push rod is hinged to a limiting chute. A spring is installed on the inner wall of the limiting chute. One end of the push rod is movably clamped with the chute on the inner wall of the limiting chute. One end of the spring is installed with a pressure sensor. Place the plastic rod on the feeding mechanism. By rotating the support roller to convey the plastic rod, while horizontally moving the plastic rod, the detection mechanism presses down through the elongation of the lifting cylinder to make the positioning mechanism at the bottom of the positioning baffle fit with the plastic rod. When there is a bend on the plastic rod, it pushes the rotating plate to deflect, and at the same time squeezes the spring on the inner wall of the limiting chute through the push rod, generating a squeezing electrical signal on the pressure sensor to detect the bending point of the plastic rod, improving the data accuracy of the detection of the plastic rod by the device.

[0011] A flattening mechanism is hinged to the bottom end of the rotating plate. The flattening mechanism includes a support side plate. The top of the support side plate is hinged to the bottom of the rotating plate. A central rotating shaft is installed on one side of the support side plate. One end of the central rotating shaft is sleeved with an oil-resistant rubber roller. An arc-shaped spring piece is installed at the center point of the central rotating shaft. A tooth ring is fixedly arranged on the inner wall of the rubber roller. One side of the arc-shaped spring piece is clamped with the tooth block of the tooth ring. There are two arc-shaped spring pieces, and the two arc-shaped spring pieces are annularly equidistantly distributed around the outer wall of the central rotating shaft. After the flattening mechanism is pressed down by the lifting cylinder, the rubber roller in the flattening mechanism fits with the surface of the plastic rod, and at the same time the rubber roller rolls horizontally along the surface of the plastic rod. Inside the rubber roller, the arc-shaped spring piece rotates around the outer wall of the tooth ring. Due to the arc-shaped setting of the arc-shaped spring piece, the reverse rotation of the rubber roller is restricted, avoiding the shrinkage and bending of the plastic rod caused by the cutter head pressing down and shearing the surface of the plastic rod, and improving the detection data accuracy of the device.

[0012] There are two feeding mechanisms, and the two feeding mechanisms are symmetrically arranged on both sides of the detection platform. There are four supporting rollers, and the four supporting rollers are concave rollers. By arranging the supporting rollers horizontally, it is convenient for users to quickly determine the position of the plastic rod on the feeding mechanism. According to the length of the plastic rod to be detected, the horizontal position of the supporting rollers can be adjusted through the electric linear guide, improving the applicability of the device. Rotating the supporting rollers can quickly adjust the position of the plastic rod on the supporting rollers, facilitating the user to quickly perform multi-point testing on the plastic rod and facilitating the user to collect multi-data.

[0013] A pressure sensing device is arranged between the bottom of the cutter head and the hydraulic cylinder.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0015] 1. Through the arrangement of the feeding mechanism and the positioning mechanism, it is convenient for users to perform multi-point detection on plastic products, improving the efficiency of the user in collecting detection data and the accuracy of data collection. By adjusting the horizontal position of the supporting rollers through the electric linear guide, after placing the plastic rod on the supporting rollers, start the motor at one end of the central shaft of the supporting rollers to push the plastic rod to move horizontally and adjust the position of the plastic rod at the point to be sheared and detected, improving the automation degree of the device.

[0016] 2. Through the arrangement of the feeding mechanism, the downward pressure detection mechanism and the positioning mechanism, while transporting the plastic product, the flatness of the surface of the plastic product is detected to ensure the horizontal quality of the point to be detected and avoid the influence of the bending of the plastic rod on the detection data. Place the plastic rod on the feeding mechanism, and transport the plastic rod 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, it pushes the rotating plate to deflect, and at the same time, the spring on the inner wall of the limiting chute is squeezed through the push rod, generating an extrusion electrical signal on the pressure sensor, and detecting the bending point of the plastic rod, improving the data accuracy of the device for detecting the plastic rod.

[0017] 3. Through the arrangement of the feeding mechanism, the downward pressure detection mechanism and the flattening mechanism, the problem of shrinkage of the plastic rod after positioning and fixing is avoided. The supporting rollers are horizontally moved through the electric linear guide to horizontally stretch the plastic rod, facilitating the user to correct the bending point on the plastic rod. The rubber and plastic roller fits with the surface of the plastic rod, and at the same time, the rubber and plastic roller rolls horizontally along the surface of the plastic rod. Inside the rubber and plastic roller, the arc-shaped spring piece rotates around the outer wall of the toothed ring, and the arc-shaped spring piece restricts the reverse rotation of the rubber and 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, and further improving the detection data accuracy of the device. Description of the Drawings

[0018] 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 to the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a front-view structural diagram of the present invention;

[0021] Figure 3 is a side-view structural diagram of the present invention;

[0022] Figure 4 is a front-view sectional structural diagram of the present invention;

[0023] Figure 5 is a schematic structural diagram of the leveling mechanism of the present invention;

[0024] Figure 6 is a front-view structural diagram of the leveling mechanism of the present invention;

[0025] Figure 7 is a sectional structural diagram of the leveling mechanism of the present invention;

[0026] Figure 8 is the present invention Figure 7 The enlarged structural diagram at position A in.

[0027] In the figure:

[0028] 1. Detection platform;

[0029] 2. Feeding mechanism; 201. Electric linear rail; 202. Support roller;

[0030] 3. Press-down detection mechanism; 301. Positioning strut; 302. Top plate; 303. Lifting cylinder; 304. Positioning baffle; 305. Hydraulic cylinder; 306. Tool bit;

[0031] 4. Bearing plate member;

[0032] 5. Positioning mechanism; 501. Rotating plate; 502. Push rod; 503. Limit sliding groove; 504. Leveling mechanism; 5041. Support side plate; 5042. Central rotating shaft; 5043. Rubber and plastic roller; 5044. Arc-shaped spring piece; 5045. Tooth ring

[0033] 6. Plastic rod. Detailed implementation manners

[0034] 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.

[0035] Please refer to Figures 1-8 , the present invention provides a technical solution:

[0036] A shear strength testing device for plastic products, comprising a detection platform 1. A feeding mechanism 2 is installed on the upper surface of the detection platform 1. A downward pressure detection mechanism 3 is arranged at the top of the feeding mechanism 2. A bearing plate member 4 is arranged at the bottom of the downward pressure detection mechanism 3. A positioning mechanism 5 is arranged inside the downward pressure detection mechanism 3. A plastic rod 6 is clamped at the bottom of the positioning mechanism 5;

[0037] The downward pressure detection mechanism 3 includes a positioning support rod 301. The bottom end of the positioning support rod 301 is connected to the detection platform 1. The top end of the positioning support rod 301 is provided with a top plate 302. 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. The cutter head 306 is located directly above the vertical of the bearing plate member 4.

[0038] The feeding mechanism 2 includes an electric linear rail 201. The bottom of the electric linear rail 201 is fixedly connected to the upper surface of the detection platform 1. A support roller 202 is arranged at the top of the electric linear rail 201. The central shaft of the support roller 202 is connected to a motor. The outer wall of the support roller 202 is connected to the plastic rod 6. By starting the electric linear rail 201 to adjust the horizontal position of the support roller 202, after placing the plastic rod 6 on the support roller 202, start the motor at one end of the central shaft of the support roller 202 to push the plastic rod 6 to move horizontally, and adjust the position of the point to be sheared and detected on the plastic rod 6, improving the automation degree of the device.

[0039] A through hole is opened on the upper surface of the bearing plate member 4. The cutter head 306 matches the size of the through hole on the upper surface of the bearing plate member 4. The positioning baffle 304 is movably clamped with the positioning support rod 301. 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, adjusting 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 perform clamping and positioning according to the cross-sectional size of the plastic rod 6, improving the applicability of the device.

[0040] The positioning mechanism 5 includes 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 at the center point of the rotating plate 501. One end of the push rod 502 is hinged to a limit chute 503. A spring is installed on the inner wall of the limit chute 503. One end of the push rod 502 is movably clamped with the chute on the inner wall of the limit chute 503. One end of the spring is installed with a pressure sensor. Place the plastic rod 6 on the feeding mechanism 2. Convey the plastic rod 6 by rotating the support roller 202. While horizontally moving the plastic rod 6, the pressing 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, it pushes the rotating plate 501 to deflect. At the same time, it squeezes the spring on the inner wall of the limit chute 503 through the push rod 502, generating a squeezing electrical signal for the pressure sensor, and detecting the bending point of the plastic rod 6, improving the data accuracy of the detection of the plastic rod 6 by this device.

[0041] A leveling mechanism 504 is hinged at the bottom end of the rotating plate 501. The leveling mechanism 504 includes a support side plate 5041. The top of the support side plate 5041 is hinged to the bottom of the rotating plate 501. A central rotating shaft 5042 is installed on one side of the support side plate 5041. One end of the central rotating shaft 5042 is sleeved with an oil-impregnated rubber and plastic roller 5043. An arc-shaped spring piece 5044 is installed at the center point of the central rotating shaft 5042. A tooth ring 5045 is fixedly arranged on the inner wall of the rubber and plastic roller 5043. One side of the arc-shaped spring piece 5044 is clamped with the tooth block of the tooth ring 5045. There are two arc-shaped spring pieces 5044, and the two arc-shaped spring pieces 5044 are annularly equidistantly distributed 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 and plastic roller 5043 in the leveling mechanism 504 fits with the surface of the plastic rod 6. At the same time, the rubber and plastic roller 5043 rolls horizontally along the surface of the plastic rod 6. Inside the rubber and plastic roller 5043, the arc-shaped spring piece 5044 rotates around the outer wall of the tooth ring 5045. Due to the arc-shaped setting of the arc-shaped spring piece 5044, the reverse rotation of the rubber and plastic roller 5043 is restricted, avoiding the shrinkage and bending of the plastic rod 6 caused by the downward pressing and shearing of the cutter head 306 on the surface of the plastic rod 6, and improving the data accuracy of the detection of this device.

[0042] There are two feeding mechanisms 2, and the two feeding mechanisms 2 are symmetrically arranged on both sides of the detection platform 1. There are four support rollers 202, and the four support rollers 202 are set as concave rollers. Through the horizontal setting of the support rollers 202, it is convenient for 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, adjust the horizontal position of the support rollers 202 through the electric linear rail 201, improving the applicability of this device. Rotate the support rollers 202 to quickly adjust the position of the plastic rod 6 on the support rollers 202, facilitating the user to quickly perform multi-point testing on the plastic rod 6 and facilitating the user to collect various data.

[0043] A pressure sensing device is provided between the bottom of the cutter head 306 and the hydraulic cylinder 305.

[0044] The working principle of the present invention:

[0045] First, place the plastic rod 6 to be tested for shear strength on the upper surface of the support roller 202. By starting the electric linear guide 201, adjust the horizontal position of the support roller 202. After placing the plastic rod 6 on the support roller 202, start the motor at one end of the central shaft of the support roller 202 to push the plastic rod 6 to move horizontally and adjust the position of the point to be sheared and detected on the plastic rod 6.

[0046] The telescopic lifting cylinder 303 drives the positioning baffle 304 to move vertically up and down along the positioning support rod 301 to adjust 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 perform clamping and positioning according to the cross-sectional size of the plastic rod 6.

[0047] Place the plastic rod 6 on the feeding mechanism 2. While transporting the plastic rod 6 by rotating the support roller 202 and horizontally moving the plastic rod 6, the lower pressure detection mechanism 3 descends through the elongation 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 in the plastic rod 6, it pushes the rotating plate 501 to deflect, and at the same time, the spring on the inner wall of the limit chute 503 is squeezed through the push rod 502, generating a squeezing electrical signal for the pressure sensor to detect the bending point of the plastic rod 6.

[0048] After the leveling mechanism 504 is pressed down by the lifting cylinder 303, the rubber and plastic roller 5043 in the leveling mechanism 504 fits with the surface of the plastic rod 6, and at the same time, the rubber and plastic roller 5043 rolls horizontally along the surface of the plastic rod 6. Inside the rubber and plastic roller 5043, the arc-shaped spring piece 5044 rotates around the outer wall of the tooth ring 5045. Due to the arc-shaped setting of the arc-shaped spring piece 5044, the reverse rotation of the rubber and plastic roller 5043 is restricted, avoiding the shrinkage and bending of the plastic rod 6 caused by the downward pressure and shear of the cutter head 306 on the surface of the plastic rod 6, and improving the accuracy of the detection data of this device.

[0049] Due to the horizontal setting of the support roller 202, it is convenient for 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 support roller 202 is adjusted through the electric linear guide 201 to improve the applicability of this device. Rotating the support roller 202 can quickly adjust the position of the plastic rod 6 on the support roller 202, which is convenient for the user to quickly perform multi-point testing on the plastic rod 6 and facilitate the user's multi-data collection.

[0050] The flat points on the plastic rod 6 are detected, the pressing detection mechanism 3 is continuously lowered, the cutter head 306 performs a shearing test on the plastic rod 6, the bearing plate member 4 supports the bottom of the plastic rod 6, and the anti-shearing strength data of the plastic rod 6 is obtained through the pressure sensing device at the top of the cutter head 306. The pressing detection mechanism 3 is raised, and the rotating support roller 202 horizontally conveys the plastic rod 6 to quickly continue the detection of other points on the plastic rod 6, improving the working efficiency of the device.

[0051] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0052] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A test device for the shear strength of plastic products, characterized in that: It includes a detection platform (1), a feeding mechanism (2) is installed on the upper surface of the detection platform (1), a downward pressure detection mechanism (3) is arranged at the top of the feeding mechanism (2), a bearing plate member (4) is arranged at the bottom of the downward pressure detection mechanism (3), a positioning mechanism (5) is arranged inside the downward pressure detection mechanism (3), and a plastic rod member (6) is clamped at the bottom of the positioning mechanism (5); The downward pressure detection mechanism (3) includes 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), a cutter head (306) is connected to the bottom end of the hydraulic cylinder (305), and the cutter head (306) is located directly above the bearing plate member (4) vertically; The feeding mechanism (2) includes an electric linear rail (201), the bottom of the electric linear rail (201) is fixedly connected to the upper surface of the detection platform (1), a support roller (202) is arranged at 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 member (6); A through hole is formed on the upper surface of the bearing plate member (4), the size of the cutter head (306) matches the through hole on the upper surface of the bearing plate member (4), the positioning baffle (304) is movably clamped with the positioning support rod (301), and the bottom of the positioning baffle (304) is connected to the positioning mechanism (5); The positioning mechanism (5) includes 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 limit chute (503), a spring is installed on the inner wall of the limit chute (503), one end of the push rod (502) is movably clamped with the chute on the inner wall of the limit chute (503), and a pressure sensor is installed at one end of the spring; The bottom end of the rotating plate (501) is hinged with a leveling mechanism (504). The leveling mechanism (504) includes a support side plate (5041). The top of the support side plate (5041) is hinged to the bottom of the rotating plate (501). A central rotating shaft (5042) is installed on one side of the support side plate (5041). One end of the central rotating shaft (5042) is sleeved with an oil-impregnated rubber and plastic roller (5043). An arc-shaped spring piece (5044) is installed at the center point of the central rotating shaft (5042). A toothed ring (5045) is fixedly arranged on the inner wall of the rubber and plastic roller (5043). One side of the arc-shaped spring piece (5044) is clamped with the tooth block of the toothed ring (5045). There are two arc-shaped spring pieces (5044), and the two arc-shaped spring pieces (5044) are annularly and equidistantly distributed about the outer wall of the central rotating shaft (5042).

2. The anti-shear strength testing device for plastic products according to claim 1, characterized in that: There are two feeding mechanisms (2), and the two feeding mechanisms (2) are symmetrically arranged on both sides of the detection platform (1). There are four support rollers (202), and the four support rollers (202) are concave rollers.

3. The anti-shear strength testing device for plastic products according to claim 1, wherein: A pressure sensing device is arranged between the bottom of the tool head (306) and the hydraulic cylinder (305).

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