A cutting device for plastic detection thin sheet specimens

Abstract

The present invention relates to the technical field of auxiliary detection cutting equipment, and specifically discloses a cutting device for plastic detection thin sheet specimens, including a bottom plate and a plastic pipe. The plastic pipe is located above the bottom plate; a rotary transfer assembly, the rotary transfer assembly includes two linear guide rails, the linear guide rails are installed at the top end of the bottom plate, and the two linear guide rails are connected with a support frame through linear bearings. A mounting seat is fixedly installed at the top end of the support frame, and a three-jaw chuck is fixedly installed between the two vertical sections of the mounting seat. The three-jaw chuck is used to fix and rotate the plastic pipe; a vertical plate, the vertical plate is installed at the top end of the bottom plate. The present invention has an automatic cutting device for the inner and outer oxidized surfaces of plastic detection thin sheets, improves the accuracy of subsequent detection data, has an automatic adjustment cutting function for plastic detection thin sheets with different pipe diameters, and improves the stability of the cutting process of plastic detection thin sheets with lower hardness.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary detection cutting equipment, and in particular to a cutting device for plastic detection sheet samples. Background Art

[0002] The thermal stability of plastics refers to the ability of plastics to withstand thermal shock without being destroyed. In chemistry, it refers to the difficulty of chemical reactions under certain conditions. The thermal stability of plastics represents the ability to effectively prevent, reduce or even stop the degradation of materials. The higher the energy required to destroy plastics, the more stable they are. Differential scanning calorimetry (DSC) is currently the most widely used method for testing the thermal stability of plastics. It usually measures the time or temperature required for the antioxidant stabilization system in the sample to inhibit its oxidation when the temperature is kept constant at a specified temperature or increased at a constant rate in an oxygen or air atmosphere. The oxidation induction time or oxidation induction temperature is a means of evaluating the stability level (or degree) of the material being tested. The higher the test temperature, the shorter the oxidation induction time; the faster the heating rate, the higher the oxidation induction temperature. The oxidation induction time and oxidation induction temperature are directly related to the surface area of ​​the sample that is subject to oxidation.

[0003] The DSC test standard stipulates that the sample thickness is (650±100) μm, and requires uniform thickness, parallel and flat surfaces, and no burrs. The specific surface area, sample unevenness, and residual stress of the sample will have a significant impact on the test results. In actual testing, the final form of the sample is generally a pipe. The outer surface and inner surface of the plastic pipe have been oxidized due to exposure to the air, and the surface of the pipe is curved, which invisibly increases the surface area.

[0004] Before testing, existing plastic pipes are usually cut manually or by large-scale machinery to obtain the final sample. However, manual cutting accuracy is difficult to meet the testing requirements, and large-scale mechanical processing is time-consuming, labor-intensive, and costly, resulting in insufficient efficiency in cutting the oxidized surface of the plastic pipe. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a cutting device for plastic testing thin sheet samples, which can solve the problems raised in the above background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A cutting device for plastic testing thin-sheet samples, comprising:

[0008] A bottom plate and a plastic pipe, wherein the plastic pipe is located above the bottom plate;

[0009] Rotary transfer assembly, the rotary transfer assembly includes two linear guide rails, the linear guide rails are installed at the top of the bottom plate, the two linear guide rails are connected with a support frame through linear bearings, a mounting seat is fixedly installed at the top of the support frame, and a three-jaw chuck is fixedly installed between the two vertical sections of the mounting seat, and the three-jaw chuck is used to fix and rotate the plastic pipe;

[0010] Vertical plate, the vertical plate is installed at the top of the bottom plate, a limiting groove is arranged on the side wall of the vertical plate, and the limiting groove is arranged in a "convex" shape;

[0011] First cutting assembly, the first cutting assembly is used to cut the outer wall of the plastic pipe, the first cutting assembly includes a sliding block, the sliding block is slidably installed between the two vertical sections with a narrow pitch of the limiting groove, a first L-shaped rod is fixedly installed on the side wall of the sliding block, a first scraping strip is fixedly installed at the bottom end of the vertical section of the first L-shaped rod, a first cutting knife is arranged at the bottom end of the first scraping strip, and a driving mechanism for driving the sliding block to lift is arranged on the side wall of the vertical plate;

[0012] Second cutting assembly, the second cutting assembly is used to cut the inner wall of the plastic pipe, the second cutting assembly includes a square pipe, the square pipe penetrates and is fixedly installed between the two vertical sections with a wide pitch of the limiting groove, two limiting columns are fixedly installed between the top wall and the bottom wall of the square pipe, two lifting plates are slidably installed between the two limiting columns, a second L-shaped rod is fixedly installed on one side of each of the two lifting plates close to the mounting seat, a second scraping strip is fixedly installed at one end of the second L-shaped rod close to the mounting seat, and a second cutting knife is arranged on one side of each of the two second scraping strips away from each other;

[0013] Screw rod, the screw rod penetrates and is rotatably installed at the top and bottom of the square pipe, two sections of threads with opposite helix directions and the same pitch are arranged on the side wall of the screw rod, the two lifting plates are respectively matched with the adjacent threads, and a driving component for driving the rotation of the screw rod is arranged at the bottom end of the square pipe.

[0014] Preferably, a plurality of support feet are arranged at the bottom end of the bottom plate, the front view of the support feet is arranged in an inverted T shape, and a rubber pad is arranged at the bottom end of the support feet.

[0015] Preferably, the two linear guide rails are electrically connected through a controller, and the two linear guide rails are respectively arranged parallel to the plastic pipe.

[0016] Preferably, the three-jaw chuck is composed of a chuck body, three movable jaws and a driving mechanism, and the three-jaw chuck realizes the clamping and positioning of the workpiece through the radial movement of the jaws.

[0017] Preferably, the sliding block is arranged in a "soil" shape, and the sliding block is slidably connected with the vertical plate through the limiting groove.

[0018] Preferably, two first limiting strips are arranged at the bottom end of the first scraping strip. The end faces of the two first limiting strips are fan-shaped. The two first limiting strips are symmetrically arranged with respect to the first scraping knife. The distance from the first limiting strip to the outer wall of the plastic pipe is less than the distance from the cutting edge of the first scraping knife to the outer wall of the plastic pipe.

[0019] Preferably, the driving mechanism includes a pneumatic cylinder. The pneumatic cylinder is installed on the side wall of the vertical plate. The bottom end of the piston rod of the pneumatic cylinder is fixedly connected to the top end of the sliding block.

[0020] Preferably, the two second scraping strips are symmetrically arranged with respect to the central axis of the plastic pipe. The distance from the top end of the second scraping strip located above to the central axis of the plastic pipe is less than the inner diameter of the plastic pipe.

[0021] Preferably, second limiting strips are arranged on the sides of the two second scraping strips away from each other. The two second limiting strips are symmetrically arranged with respect to the adjacent second scraping knife. The end face of the second limiting strip is fan-shaped. The distance from the second limiting strip to the inner wall of the plastic pipe is less than the distance from the cutting edge of the second scraping knife to the inner wall of the plastic pipe.

[0022] Preferably, the driving assembly includes a U-shaped block. The U-shaped block is fixedly installed on the outer wall of one side of the vertical plate. A reduction box is fixedly installed at the top end of the U-shaped block. The output shaft of the reduction box is fixedly connected to the screw rod through a coupling. A servo motor is fixedly installed at the bottom end of the U-shaped block. The output shaft of the servo motor is fixedly connected to the input shaft of the reduction box through a coupling.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. By setting up a rotary transfer component, the beneficial effects that can be obtained are as follows: The plastic pipe is located above the bottom plate. The linear guide rails are installed at the top of the bottom plate. Two linear guide rails are connected with a support frame through linear bearings. A mounting seat is fixedly installed at the top of the support frame. A three-jaw chuck is fixedly installed between the two vertical sections of the mounting seat. The three-jaw chuck is used to fix and rotate the plastic pipe. The first cutting component is used to cut the outer wall of the plastic pipe. The first cutting component includes a sliding block. The sliding block is slidably installed between the two vertical sections of the narrow-spacing of the limiting groove. A first L-shaped rod is fixedly installed on the side wall of the sliding block. A first scraping strip is fixedly installed at the bottom end of the vertical section of the first L-shaped rod. A first cutting knife is arranged at the bottom end of the first scraping strip. A driving mechanism for driving the sliding block to lift and lower is arranged on the side wall of the vertical plate. The second cutting component is used to cut the inner wall of the plastic pipe. The second cutting component includes a square pipe. The square pipe penetrates and is fixedly installed between the two vertical sections of the wide-spacing of the limiting groove. Two limiting columns are fixedly installed between the top wall and the bottom wall of the square pipe. Two lifting plates are slidably installed between the two limiting columns. A second L-shaped rod is fixedly installed on one side of each of the two lifting plates close to the mounting seat. A second scraping strip is fixedly installed at one end of the second L-shaped rod close to the mounting seat. A second cutting knife is arranged on the side of each of the two second scraping strips away from each other;

[0025] The three-jaw chuck realizes the clamping and positioning of the plastic pipe through the radial movement of the jaws. The two linear guide rails drive the support frame, the mounting seat, the three-jaw chuck and the plastic pipe to move synchronously towards the vertical plate. At the same time, the three-jaw chuck drives the plastic pipe to rotate. The first cutting knife cuts the outer wall of the plastic pipe, and the second cutting knife cuts the inner wall of the plastic pipe, completing the cutting of the inner and outer surfaces of the plastic pipe, and having an automatic cutting device for the inner and outer oxidized surfaces of the plastic test thin sheet, improving the accuracy of subsequent test data.

[0026] 2. By setting up a driving mechanism and a driving component, the beneficial effects that can be obtained are as follows: A screw rod penetrates and is rotatably installed at the top and bottom of the square pipe. Two sections of threads with opposite helix directions and the same pitch are arranged on the side wall of the screw rod. The two lifting plates respectively match with the adjacent threads. An air cylinder is installed on the side wall of the vertical plate. The bottom end of the piston rod of the air cylinder is fixedly connected with the top end of the sliding block. The driving component includes a U-shaped block. The U-shaped block is fixedly installed on the outer wall of one side of the vertical plate. A reduction box is fixedly installed at the top of the U-shaped block. The output shaft of the reduction box is fixedly connected with the screw rod through a coupling. A servo motor is fixedly installed at the bottom of the U-shaped block. The output shaft of the servo motor is fixedly connected with the input shaft of the reduction box through a coupling;

[0027] According to the pipe diameter of the plastic pipe, the air cylinder drives the sliding block to slide in the limiting groove of the vertical plate. The first scraping strip of the first L-shaped rod and the first scraping knife are lifted and lowered synchronously. The first scraping knife matches the outer wall of the plastic pipe. At the same time, the servo motor cooperates with the reduction box to drive the screw rod to rotate, and the two lifting plates move away from each other along the two limiting columns. The second L-shaped rod, the second scraping strip and the second scraping knife are lifted and lowered synchronously with the adjacent lifting plate. The second scraping knife matches the inner wall of the plastic pipe, achieving the automatic adjustment type cutting function for plastic inspection sheets with different pipe diameters.

[0028] 3. By setting the first limiting strip and the second limiting strip, the beneficial effect that can be obtained is that there are two first limiting strips at the bottom end of the first scraping strip. The end faces of the two first limiting strips are fan-shaped. The two first limiting strips are symmetrically arranged with respect to the first scraping knife. The distance from the first limiting strip to the outer wall of the plastic pipe is less than the distance from the cutting edge of the first scraping knife to the outer wall of the plastic pipe. The two second scraping strips are symmetrically arranged with respect to the central axis of the plastic pipe. The distance from the top end of the second scraping strip located above to the central axis of the plastic pipe is less than the inner diameter of the plastic pipe.

[0029] When the material of the plastic pipe is relatively hard, the first scraping knife cuts the outer wall of the plastic pipe, and the second scraping knife cuts the inner wall of the plastic pipe to complete the cutting of the inner and outer surfaces of the plastic pipe. When the material hardness of the plastic pipe is relatively low, the first limiting strip assists in supporting and limiting the outer wall of the plastic pipe to ensure the stability of the first scraping knife cutting the outer wall of the plastic pipe. The second limiting strip assists in supporting and limiting the inner wall of the plastic pipe to ensure the stability of the second scraping knife cutting the inner wall of the plastic pipe. At the same time, the two second scraping knives support and cut the plastic pipe synchronously, improving the stability of the cutting process of the plastic inspection sheet with relatively low hardness. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 is the overall structural schematic diagram of the present invention;

[0032] Figure 2 is the installation structure diagram of the square pipe in the present invention;

[0033] Figure 3 is the installation structure diagram of the vertical plate in the present invention;

[0034] Figure 4 is the installation structure diagram of the sliding block in the present invention;

[0035] Figure 5 is the installation structure diagram of the screw rod in the present invention;

[0036] Figure 6 is in the present invention Figure 2 The enlarged view at A in;

[0037] Figure 7 In the present invention Figure 2 The enlarged view of part B in

[0038] Figure 8 The installation structure diagram of the driving component in the present invention

[0039] Figure 9 The exploded view of the driving component in the present invention

[0040] Explanation of reference numerals:

[0041] In the figure: 1, bottom plate; 11, support feet; 2, plastic pipe; 31, linear guide rail; 32, support frame; 33, mounting seat; 34, three-jaw chuck; 4, vertical plate; 41, limit groove; 51, sliding block; 52, first L-shaped rod; 53, first scraping strip; 54, first scraper; 55, first limit strip; 56, pneumatic cylinder; 6, square pipe; 61, limit post; 62, lifting plate; 63, second L-shaped rod; 64, second scraping strip; 65, second scraper; 66, second limit strip; 7, screw; 71, U-shaped block; 72, reduction gearbox; 73, servo motor Detailed implementation manners

[0042] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following describes in clear and complete detail the specific implementation manners, structures, features and their effects of the present invention in conjunction with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "inside", "outside", etc. is based on the orientation or position shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present application

[0044] Referring to Figures 1-9 , a cutting device for plastic detection thin sheet specimens disclosed in the present invention includes a bottom plate 1 and a plastic pipe 2. The plastic pipe 2 is located above the bottom plate 1. A plurality of support feet 11 are provided at the bottom end of the bottom plate 1. The front view of the support feet 11 is in an inverted T-shaped arrangement, and a rubber pad is provided at the bottom end of the support feet 11

[0045] Rotary transfer assembly. The rotary transfer assembly includes two linear guide rails 31. The linear guide rails 31 are installed at the top end of the bottom plate 1. The two linear guide rails 31 are electrically connected through a controller. The two linear guide rails 31 are respectively arranged in parallel with the plastic pipe 2. The two linear guide rails 31 are connected with a support frame 32 through linear bearings. A mounting seat 33 is fixedly installed at the top end of the support frame 32. A three-jaw chuck 34 is fixedly installed between the two vertical sections of the mounting seat 33. The three-jaw chuck 34 is used to fix and rotate the plastic pipe 2. The three-jaw chuck 34 is composed of a chuck body, three movable jaws and a driving mechanism. The three-jaw chuck 34 realizes the clamping and positioning of the workpiece through the radial movement of the jaws;

[0046] Vertical plate 4. The vertical plate 4 is installed at the top end of the bottom plate 1. A limiting groove 41 is provided on the side wall of the vertical plate 4. The limiting groove 41 is arranged in a "convex" shape;

[0047] First cutting assembly. The first cutting assembly is used to cut the outer wall of the plastic pipe 2. The first cutting assembly includes a sliding block 51. The sliding block 51 is slidably installed between the two vertical sections with a narrow spacing of the limiting groove 41. The sliding block 51 is arranged in a "soil" shape. The sliding block 51 is slidably connected with the vertical plate 4 through the limiting groove 41. A first L-shaped rod 52 is fixedly installed on the side wall of the sliding block 51. A first scraping strip 53 is fixedly installed at the bottom end of the vertical section of the first L-shaped rod 52. A first cutting knife 54 is provided at the bottom end of the first scraping strip 53. Two first limiting strips 55 are provided at the bottom end of the first scraping strip 53. The end faces of the two first limiting strips 55 are fan-shaped. The two first limiting strips 55 are symmetrically arranged with respect to the first cutting knife 54. The distance from the first limiting strip 55 to the outer wall of the plastic pipe 2 is less than the distance from the cutting edge of the first cutting knife 54 to the outer wall of the plastic pipe 2. A driving mechanism for driving the sliding block 51 to lift is provided on the side wall of the vertical plate 4. The driving mechanism includes a pneumatic cylinder 56. The pneumatic cylinder 56 is installed on the side wall of the vertical plate 4. The bottom end of the piston rod of the pneumatic cylinder 56 is fixedly connected with the top end of the sliding block 51;

[0048] The second cutting assembly is used to cut the inner wall of the plastic pipe 2. The second cutting assembly includes a square pipe 6 which is fixedly installed between two vertical sections with a wide spacing of the limiting groove 41 in a penetrating manner. Between the top wall and the bottom wall of the square pipe 6, two limiting columns 61 are fixedly installed. Between the two limiting columns 61, two lifting plates 62 are slidably installed. On one side of each of the two lifting plates 62 close to the mounting seat 33, a second L-shaped rod 63 is fixedly installed. At one end of the second L-shaped rod 63 close to the mounting seat 33, a second scraping strip 64 is fixedly installed. The two second scraping strips 64 are symmetrically arranged with respect to the central axis of the plastic pipe 2. The distance from the top end of the second scraping strip 64 located above to the central axis of the plastic pipe 2 is less than the inner diameter of the plastic pipe 2. On the side where the two second scraping strips 64 are away from each other, a second cutter 65 is arranged. On the side where the two second scraping strips 64 are away from each other, a second limiting strip 66 is arranged. The two second limiting strips 66 are symmetrically arranged with respect to the adjacent second cutter 65. The end face of the second limiting strip 66 is fan-shaped. The distance from the second limiting strip 66 to the inner wall of the plastic pipe 2 is less than the distance between the cutting edge of the second cutter 65 and the inner wall of the plastic pipe 2;

[0049] A screw rod 7 is installed through and rotatably between the top end and the bottom end of the square pipe 6. Two sections of threads with opposite helix directions and the same pitch are arranged on the side wall of the screw rod 7. The two lifting plates 62 respectively match the adjacent threads. At the bottom end of the square pipe 6, a driving assembly is arranged for driving the rotation of the screw rod 7. The driving assembly includes a U-shaped block 71 which is fixedly installed on the outer wall of one side of the vertical plate 4. At the top end of the U-shaped block 71, a reduction box 72 is fixedly installed. The output shaft of the reduction box 72 is fixedly connected with the screw rod 7 through a coupling. At the bottom end of the U-shaped block 71, a servo motor 73 is fixedly installed. The output shaft of the servo motor 73 is fixedly connected with the input shaft of the reduction box 72 through a coupling.

[0050] Working principle and usage process of the present invention: First, the three-jaw chuck 34 realizes the clamping and positioning of the plastic pipe 2 through the radial movement of the jaws. Then, according to the diameter of the plastic pipe 2, the pneumatic cylinder 56 drives the sliding block 51 to slide in the limiting groove 41 of the vertical plate 4, and the first L-shaped rod 52, the first scraping strip 53, and the first scraping knife 54 are lifted and lowered synchronously. The first scraping knife 54 matches the outer wall of the plastic pipe 2. At the same time, the servo motor 73 cooperates with the reduction gearbox 72 to drive the screw rod 7 to rotate, and the two lifting plates 62 move away from each other along the two limiting columns 61. The second L-shaped rod 63, the second scraping strip 64, and the second scraping knife 65 are lifted and lowered synchronously with the adjacent lifting plate 62. The second scraping knife 65 matches the inner wall of the plastic pipe 2. Then, the two linear guide rails 31 drive the support frame 32, the mounting seat 33, the three-jaw chuck 34, and the plastic pipe 2 to move synchronously towards the vertical plate 4. At the same time, the three-jaw chuck 34 drives the plastic pipe 2 to rotate. When the material of the plastic pipe 2 is hard, the first scraping knife 54 cuts the outer wall of the plastic pipe 2, and the second scraping knife 65 cuts the inner wall of the plastic pipe 2 to complete the cutting of the inner and outer surfaces of the plastic pipe 2. When the material hardness of the plastic pipe 2 is relatively low, the first limiting strip 55 assists in supporting and limiting the outer wall of the plastic pipe 2 to ensure the stability of the cutting of the outer wall of the plastic pipe 2 by the first scraping knife 54. The second limiting strip 66 assists in supporting and limiting the inner wall of the plastic pipe 2 to ensure the stability of the cutting of the inner wall of the plastic pipe 2 by the second scraping knife 65. At the same time, the two second scraping knives 65 support and cut the plastic pipe 2 synchronously.

[0051] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to make equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still belong to the scope of the technical solution of the present invention.

Claims

1. A cutting device for plastic testing thin sheet samples, characterized in that: include: A bottom plate and a plastic pipe, wherein the plastic pipe is located above the bottom plate; A rotary transfer assembly, the rotary transfer assembly comprising two linear guide rails, the linear guide rails being mounted on the top of the bottom plate, the two linear guide rails being connected to a support frame via a linear bearing, a mounting seat being fixedly mounted on the top of the support frame, a three-jaw chuck being fixedly mounted between two vertical sections of the mounting seat, the three-jaw chuck being used to fix and rotate the plastic pipe; A vertical plate, the vertical plate is installed on the top of the bottom plate; A first cutting assembly, the first cutting assembly is used to cut the outer wall of the plastic pipe, the first cutting assembly comprises a sliding block, the sliding block is slidably installed between two vertical sections with a narrow spacing of the limiting groove, a first L-shaped rod is fixedly installed on the side wall of the sliding block, a first scraper is fixedly installed on the bottom end of the vertical section of the first L-shaped rod, a first scraper is arranged at the bottom end of the first scraper, and a driving mechanism for driving the sliding block to rise and fall is arranged on the side wall of the vertical plate; A second cutting assembly, the second cutting assembly is used to cut the inner wall of the plastic pipe, the second cutting assembly includes a square pipe, the square pipe passes through and is fixedly installed between two vertical sections with a wide spacing of the limiting groove, two limiting columns are fixedly installed between the top wall and the bottom wall of the square pipe, two lifting plates are slidably installed between the two limiting columns, a second L-shaped rod is fixedly installed on one side of the two lifting plates close to the mounting seat, a second scraper is fixedly installed on one end of the second L-shaped rod close to the mounting seat, and a second scraper is arranged on the side away from the two second scrapers; A screw rod, the screw rod penetrates and is rotatably mounted on the top and bottom ends of the square tube, and the bottom end of the square tube is provided with a driving assembly for driving the screw rod to rotate; Two first limit strips are arranged at the bottom end of the first scraper strip, the end surfaces of the two first limit strips are arranged in a fan shape, the two first limit strips are arranged symmetrically about the first scraper, and the distance between the first limit strip and the outer wall of the plastic tube is smaller than the distance between the blade of the first scraper and the outer wall of the plastic tube; A second limiting strip is provided on one side of the two second scraping strips which are away from each other, the two second limiting strips are symmetrically arranged with respect to the adjacent second scraper, the end surface of the second limiting strip is arranged in a fan shape, and the distance from the second limiting strip to the inner wall of the plastic tube is smaller than the distance from the blade of the second scraper to the inner wall of the plastic tube; The driving assembly includes a U-shaped block, which is fixedly installed on an outer wall of one side of the vertical plate. A reduction gearbox is fixedly installed on the top of the U-shaped block, and the output shaft of the reduction gearbox is fixedly connected to a screw through a coupling. A servo motor is fixedly installed on the bottom end of the U-shaped block, and the output shaft of the servo motor is fixedly connected to the input shaft of the reduction gearbox through a coupling.

2. A cutting device for plastic testing thin-sheet samples according to claim 1, characterized in that: A plurality of supporting feet are arranged at the bottom end of the bottom plate, and the supporting feet are arranged in an inverted T shape in a front view, and rubber pads are arranged at the bottom ends of the supporting feet.

3. A cutting device for plastic testing thin-sheet samples according to claim 1, characterized in that: The two linear guides are electrically connected through a controller, and the two linear guides are respectively arranged in parallel with the plastic tube. The three-jaw chuck consists of a chuck body, three movable jaws and a driving mechanism. The three-jaw chuck achieves clamping and positioning of the workpiece through radial movement of the jaws.

4. A cutting device for plastic testing thin-sheet samples according to claim 1, characterized in that: A limiting groove is provided on the side wall of the vertical plate. The limiting groove is arranged in a "convex" shape. The sliding block is arranged in a "soil" shape. The sliding block is slidably connected to the vertical plate through the limiting groove.

5. A cutting device for plastic testing thin-sheet samples according to claim 1, characterized in that: The driving mechanism includes a pneumatic cylinder. The pneumatic cylinder is installed on the side wall of the vertical plate. The bottom end of the piston rod of the pneumatic cylinder is fixedly connected to the top end of the sliding block.

6. A cutting device for plastic testing thin-sheet samples according to claim 1, characterized in that: The two second scraping strips are symmetrically arranged about the central axis of the plastic pipe. The distance from the top end of the second scraping strip located above to the central axis of the plastic pipe is less than the inner diameter of the plastic pipe.

7. A cutting device for plastic testing thin-sheet samples according to claim 1, characterized in that: Two sections of threads with opposite helix directions and the same pitch are provided on the side wall of the screw rod. The two lifting plates are respectively matched with the adjacent threads.

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