Device for detecting strength of polyvinyl alcohol packaging film

Abstract

The invention discloses a polyvinyl alcohol packaging film strength detection device, and relates to the technical field of packaging material detection, the polyvinyl alcohol packaging film strength detection device comprises: a fixing mechanism, the fixing mechanism comprises a clamping seat, a motor, a cam and a millstone; a clamping mechanism is mounted at the other end of the clamping seat and comprises a pneumatic push rod, a clamping plate and a grinding plate; a marking mechanism is installed in the clamping base and comprises a gear installed on an output shaft of the motor, a rack is slidably connected into the clamping base and connected with the gear in a meshed mode, one end of a connecting rod is installed on the side face of the rack, and a marking pen is installed at the other end of the connecting rod. The clamping device has the advantages that the grinding mechanism is integrated on the clamping device of the tear strength tester, grinding and marking can be carried out at the same time, and therefore efficiency is improved, and personal errors are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging material detection, and more specifically, to a device for detecting the strength of a polyvinyl alcohol packaging film. Background Art

[0002] Polyvinyl alcohol (PVA) packaging films are widely used in the packaging of food, medicine, cosmetics and other fields due to their excellent biodegradability, high transparency and good mechanical properties. To ensure the reliability of PVA films in actual use, it is crucial to accurately detect their mechanical properties (such as tensile strength, tear strength, puncture resistance, etc.).

[0003] During the actual testing process, especially in the tear strength test, the PVA sample needs to be fixed by a fixture and a tensile force is applied until it tears. Since the surface of the PVA film is smooth and soft, the friction between the fixture and the sample is insufficient, which easily causes the sample to slip during the test. This slipping phenomenon not only reduces the accuracy of the test data, but also may lead to test failure, increasing the experimental cost and time.

[0004] Currently, to solve the problem of sample slipping of PVA, it is usually necessary to manually pre-grind and roughen the surface to increase the surface friction, thereby reducing the slipping phenomenon, and it is also necessary to manually mark the sample to observe whether it slips. However, both manual grinding and manual marking are cumbersome, inefficient, and prone to introducing human errors, affecting the accuracy and repeatability of the test results. Therefore, it is necessary to propose a device for detecting the strength of a polyvinyl alcohol packaging film to solve the above problems. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a device for detecting the strength of a polyvinyl alcohol packaging film, which can solve the problems that the manual grinding and marking in the current tear strength test of PVA films are cumbersome, inefficient, and prone to introducing human errors, affecting the accuracy and repeatability of the test results. It has the advantages that a grinding mechanism is integrated on the clamping device of the tear strength tester, which can perform grinding and marking simultaneously, thereby improving the efficiency and reducing human errors.

[0006] To solve the above problems, the present invention adopts the following technical solutions: A device for detecting the strength of a polyvinyl alcohol packaging film, including a fixing mechanism, the fixing mechanism includes a clamping seat, one end of the clamping seat is provided with a motor, a cam is installed inside the clamping seat, and the output shaft of the motor is installed on one side of the cam, and a grinding disc is installed on the other side of the cam; A clamping mechanism is installed at the other end of the clamping seat, and the clamping mechanism includes a pneumatic push rod installed at the other end of the clamping seat, and a clamping plate is installed at the output end of the pneumatic push rod. The clamping plate is slidably connected to the inner side of the clamping seat, and a grinding plate is installed inside one side of the clamping plate; A marking mechanism is installed inside the clamp seat, and the marking mechanism includes a gear installed on the motor output shaft. A rack is slidably connected inside the clamp seat, and the rack is meshed with the gear. One end of a connecting rod is installed on the side of the rack, and a marking pen is installed on the other end of the connecting rod.

[0007] As a preferred solution of the present invention, the clamping seat is installed on the detection mechanism, and the detection mechanism includes a base, the top surface of the base is installed with a release device and a support column, the top side of the support column is rotatably connected to a swing plate, the side walls of the support column and the swing plate are both provided with connecting arms, and the end of each connecting arm is installed with a clamping seat.

[0008] As a preferred solution of the present invention, the fixing mechanism also includes a side groove provided on the side of the clamp seat, the connecting rod is slidably connected to the side groove, a bottom groove is provided in the middle of the inner side of the clamp seat, and a plurality of toggle teeth are provided inside the bottom groove.

[0009] As a preferred solution of the present invention, the clamping mechanism also includes an adjusting block installed on the surface of the grinding plate, the sliding groove in the splint is movably connected to a stud, and the adjusting block is slidably connected to the inside of the stud, a first spring is installed inside the stud, and the adjusting block is elastically connected to the inside of the stud through the first spring, the other side of the splint is rotatably connected to a screw sleeve, and the screw sleeve is threadedly connected to the outside of the stud, a toggle bar is installed at the bottom of the splint, the toggle bar is slidably connected to the bottom groove, and an adjustment slot is provided at one end of the toggle bar close to the splint.

[0010] As a preferred solution of the present invention, the marking mechanism further includes a pre-cutter installed at the end of the connecting rod in one of the clamping seats, and the end of the connecting rod in the other clamping seat is only equipped with the marking pen.

[0011] As a preferred solution of the present invention, a knocking mechanism is installed inside one end of the clamping seat and inside the splint, and the knocking mechanism includes a pendulum installed inside one end of the clamping seat and inside the splint, the top of the pendulum respectively abuts the surface of the corresponding cam and the surface of the grinding plate, and the bottom of the pendulum installed in the splint passes through the adjusting slot, and a first shaft is fixed on both sides of the pendulum, a first torsion spring is sleeved on the first shaft, and the pendulum is elastically connected to the inside of one end of the clamping seat and the inside of the splint through the first torsion spring, the bottom end of the pendulum is rotatably connected to a toggle head, and the bottom end of the pendulum installed in the splint is slidably connected to the bottom groove, a lever and a second shaft are installed inside the inner side of the clamping seat, the second shaft passes through the lever, a second torsion spring is sleeved on the second shaft, and the lever is elastically connected to the second shaft through the second torsion spring, one end of the lever abuts the bottom end of the cam, and the other end of the lever is fixed with a contact head.

[0012] As a preferred solution of the present invention, a dust collecting mechanism is provided at the bottom inner side of the clamp seat, and the dust collecting mechanism includes two dust collecting grooves symmetrically arranged at the bottom inner side of the clamp seat, and a storage bin is provided inside the clamp seat at one end of each dust collecting groove, and the dust collecting groove and the corresponding storage bin are connected at the sliding groove in the clamp seat at the connection, and a closed door is movably connected, and a lifting port is penetrated through the closed door, and a second spring is installed on the top surface of the closed door, and the closed door is elastically connected to the inside of the clamp seat through the second spring.

[0013] As a preferred solution of the present invention, a cleaning mechanism is installed in the dust collecting trough, and the cleaning mechanism includes two rocking arms symmetrically installed inside the bottom trough, and two third shafts are also installed in the bottom trough, and the third shaft passes through the corresponding rocking arms, and a third torsion spring is sleeved on the third shaft, and the rocking arm is elastically connected to the third shaft through the third torsion spring, and a translation plate is installed at the other end of each dust collecting trough, and a first slider is fixed to the top of both ends of the translation plate, and vertical slots are provided at both ends of the translation plate, and a sweeping plate and a third spring are installed inside the translation plate, and the sweeping plate is elastically connected to the inside of the translation plate through the third spring, and the bottom of the sweeping plate contacts the bottom surface of the dust collecting trough, and an inserting plate is installed on the outside of the sweeping plate, and second sliders are symmetrically installed on the top of both ends of the sweeping plate, and the second sliders are slidably connected to the corresponding vertical slots.

[0014] As a preferred solution of the present invention, an oscillation mechanism is provided in the clamping seat at both ends of each dust collecting trough, and the oscillation mechanism includes a smooth groove and an inclined groove symmetrically arranged on the clamping seat at both ends of the dust collecting trough, the first slider is slidably connected to the corresponding smooth groove, and the second slider is slidably connected to the corresponding inclined groove, a fourth spring is installed in the smooth groove, and one end of the fourth spring is installed on the first slider, a number of inner grooves are equidistantly arranged in the inclined groove, each of the inner grooves is slidably connected with a protrusion, and a fifth spring is also installed in the inner groove, and one end of the fifth spring is installed on the side of the protrusion.

[0015] Compared with the prior art, the advantages of the present invention are: 1. A grinding disc and plate are added to the clamping components of the existing polyvinyl alcohol film tear strength testing equipment. A motor drives the cam, and levers are used to roughen and clamp the sample surface, significantly increasing friction and effectively preventing the sample from slipping during the tearing process. Furthermore, a marking pen and pre-cutter are equipped, driven by motor power to mark and pre-cut the sample surface, ensuring accurate tear location and facilitating manual observation of mark offset to determine whether slippage is occurring. The entire testing process is highly automated and easy to operate. The position of the grinding plate can also be adjusted to further optimize the clamping force, reduce slippage, and ensure the accuracy and reliability of the test data.

[0016] 2. After the test is completed, as the clamping plate moves away from the sample, the movement of the clamping plate and the toggle bar causes the pendulum inside the clamping base and clamping plate to swing, striking the cam and grinding plate, generating vibrations that shake off any attached debris. This cleaning process, achieved through repeated swings of the pendulum and the elastic force of the first torsion spring, significantly improves the cleaning effect and effectively resolves the issues of insufficient clamping force and slippage caused by residual debris. Furthermore, during the clamping and tearing tests, the coordinated rotation of the toggle head and the pendulum prevents erroneous swings of the pendulum, ensuring stable operation.

[0017] 3. By setting up a dust collection trough on the inner side of the clamping base, and the linkage design of the sweeping plate and the closed door, efficient cleaning and collection of PVA residue at the bottom of the inner side of the clamping base is achieved. Driven by the swing arm, the sweeping plate gradually slides out from the inner groove of the translation plate, close to the ground of the dust collection trough, and thoroughly cleans the residue on the bottom of the dust collection trough. The residue is transferred to the storage bin through the cooperation of the plug plate and the closed door to prevent the residue from scattering and polluting the environment. In addition, during the resetting process of the sweeping plate, the equidistantly set protrusions and the second slider cooperate to achieve a brief rise and vibration of the sweeping plate, ensuring that the residue residue on the sweeping plate brush is shaken off, preventing the residue from overflowing and secondary pollution, and improving the cleanliness of the equipment and the neatness of the testing environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the fixing mechanism of the present invention; Figure 3 It is a partial cross-sectional structural schematic diagram of the fixing mechanism of the present invention; Figure 4 It is a schematic diagram of the overall cross-section structure of the clamping mechanism of the present invention; Figure 5 It is a schematic diagram of a partially cutaway structure of the clamping mechanism of the present invention; Figure 6 It is a schematic diagram of the overall cross-section structure of the fixing mechanism of the present invention; Figure 7 It is a schematic diagram of the coordination structure of the fixing mechanism and the marking mechanism of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the clamping base of the present invention; Figure 9 For the present invention Figure 8 A in the middle is an enlarged structural diagram; Figure 10 It is a partial structural diagram of the oscillation mechanism of the present invention; Figure 11 This is a schematic diagram of the coordination structure between the toggle bar and the rocker arm of the present invention; Figure 12 It is a schematic diagram of the matching structure of the plug board and the lifting port of the present invention.

[0019] Description of the numbers in the figure: 1. Detection mechanism; 11. Base; 12. Release device; 13. Support column; 14. Swing plate; 15. Connecting arm; 2. Fixing mechanism; 21. Clamping seat; 22. Motor; 23. Cam; 24. Grinding disc; 25. Side groove; 26. Bottom groove; 27. Poking tooth; 3. Clamping mechanism; 31. Pneumatic push rod; 32. Clamping plate; 33. Grinding plate; 34. Adjusting block; 35. Stud; 36. Nut; 37. First spring; 38. Poking bar; 39. Adjusting groove; 4. Marking mechanism; 41. Gear; 42. Rack; 43. Connecting rod; 44. Marker pen; 45. Pre-cutting knife; 5. Knocking mechanism; 51. Pendulum; 52. First shaft; 53. First torsion spring; 54. Poking head; 55. Lever; 56. Second shaft; 57. Second torsion spring; 58. Contact head; 6. Dust collection mechanism; 61. Dust collection groove; 62. Storage bin; 63. Sealing door; 64. Lifting port; 65. Second spring; 7. Cleaning mechanism; 71. Swing rod; 72. Third shaft; 73. Third torsion spring; 74. Translation plate; 75. Insertion plate; 76. First slider; 77. Vertical groove; 78. Sweeping plate; 79. Third spring; 791. Second slider; 8. Oscillation mechanism; 81. Smooth groove; 82. Fourth spring; 83. Inclined sliding groove; 84. Inner sliding groove; 85. Convex block; 86. Fifth spring; 9. Sample. Detailed implementation mode

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.

[0021] Example 1, please refer to Figures 1 to 12 As shown in the figure, the present invention discloses a device for detecting the strength of a polyvinyl alcohol packaging film, including a fixing mechanism 2. The fixing mechanism 2 includes a clamping seat 21. One end of the clamping seat 21 is provided with a motor 22. A cam 23 is installed inside the clamping seat 21, and the output shaft of the motor 22 is installed on one side of the cam 23. A grinding disc 24 is installed on the other side of the cam 23; The other end of the clamping seat 21 is provided with a clamping mechanism 3. The clamping mechanism 3 includes a pneumatic push rod 31 installed at the other end of the clamping seat 21. The output end of the pneumatic push rod 31 is provided with a clamping plate 32. The clamping plate 32 is slidably connected to the inner side of the clamping seat 21. A grinding plate 33 is installed inside one side of the clamping plate 32; A marking mechanism 4 is installed inside the clamping seat 21. The marking mechanism 4 includes a gear 41 installed on the output shaft of the motor 22. A rack 42 is slidably connected inside the clamping seat 21. The rack 42 is meshed with the gear 41. One end of a connecting rod 43 is installed on the side of the rack 42, and a marker pen 44 is installed at the other end of the connecting rod 43.

[0022] The clamping seat 21 is installed on the detection mechanism 1, and the detection mechanism 1 includes a base 11. The top surface of the base 11 is installed with a release device 12 and a support column 13. The top side of the support column 13 is rotatably connected to a swing plate 14. The side walls of the support column 13 and the swing plate 14 are both provided with connecting arms 15, and the end of each connecting arm 15 is installed with a clamping seat 21.

[0023] The fixing mechanism 2 further includes a side groove 25 provided on the side of the clamping seat 21 , and the connecting rod 43 is slidably connected in the side groove 25 . A bottom groove 26 is provided in the middle of the inner side of the clamping seat 21 , and a plurality of shifting teeth 27 are provided inside the bottom groove 26 .

[0024] The clamping mechanism 3 also includes an adjusting block 34 installed on the surface of the grinding plate 33. The sliding groove in the splint 32 is movably connected to the stud 35, and the adjusting block 34 is slidably connected to the inside of the stud 35. A first spring 37 is installed inside the stud 35. The adjusting block 34 is elastically connected to the inside of the stud 35 through the first spring 37. The other side of the splint 32 is rotatably connected to the screw sleeve 36, and the screw sleeve 36 is threadedly connected to the outside of the stud 35. A toggle bar 38 is installed at the bottom of the splint 32, and the toggle bar 38 is slidably connected to the bottom groove 26. An adjusting groove 39 is provided at the end of the toggle bar 38 close to the splint 32.

[0025] The marking mechanism 4 further includes a pre-cutter 45 installed at the end of a connecting rod 43 in one of the clamping seats 21 , and only a marking pen 44 is installed at the end of the connecting rod 43 in the other clamping seat 21 .

[0026] Release device 12 is an electric push rod used to control the swing of swing plate 14. The fixing mechanism 2 mounted on the connecting arm 15 on the side of support column 13 remains stationary, while the fixing mechanism 2 mounted on the connecting arm 15 on the side of swing plate 14 moves with the swing of swing plate 14. When swing plate 14 moves, the two fixing mechanisms 2 become misaligned, simulating the action of tearing sample 9. The sensor then detects the tensile force applied to sample 9 during this action, ultimately detecting the tear resistance of sample 9.

[0027] First, rotate the swing plate 14 to make the two clamping seats 21 on the same horizontal plane. Then, control the release device 12 to rise from the base 11 to prevent the swing plate 14 from rotating. Next, horizontally place the sample 9 (usually rectangular) inside the two clamping seats 21. At the same time, start the pneumatic push rods 31 at the other ends of the two clamping seats 21. The pneumatic push rods 31 drive the clamping plates 32 to move inside the clamping seats 21 and cooperate with one end of the clamping seats 21 to initially clamp the sample 9 (the side view of the clamping seat 21 is a U-shaped structure). After the one end of the clamping seat 21 and the clamping plate 32 clamp the sample 9, the grinding disc 24 and the grinding plate 33 respectively abut against the two sides of the sample 9. Subsequently, start the motor 22 at one end of the clamping seat 21. The motor 22 drives the cam 23 inside one end of the clamping seat 21 to rotate. The grinding disc 24 is installed on the surface of the cam 23 to polish the surface of the sample 9, making its surface rough and increasing the frictional resistance. When the clamping plate 32 clamps the sample 9, the bottom of the grinding plate 33 inside it exactly aligns with the contact head 58 in the middle of the inner side of the clamping seat 21. And while the motor 22 drives the cam 23 to rotate, the cam 23 intermittently abuts against one end of the lever 55, thereby driving the lever 55 to swing around the second shaft 56 (the abutment of the cam 23 against the lever 55 causes one end of the lever 55 to swing downward and the other end to swing upward). When the lever 55 swings, it stores energy in the second torsion spring 57 and at the same time drives the contact head 58 at its other end to abut upward against the bottom end of the grinding plate 33, pushing the grinding plate 33 upward. When the grinding plate 33 moves upward, it drives the adjusting block 34 to slide in the chute of the stud 35, compressing the first spring 37. Therefore, during the entire movement process, the grinding plate 33 reciprocates up and down inside the clamping plate 32 to polish the other side of the sample 9, also achieving the effect of increasing the surface friction of the sample 9. After that, start the pneumatic push rod 31 again to make the clamping plate 32 further approach the sample 9, stably clamping the sample 9 inside the clamping seat 21. The grinding disc 24 and the grinding plate 33 further press the sample 9. Moreover, due to the roughness of the grinding disc 24 and the grinding plate 33 after polishing, the contact frictional force between the grinding disc 24 and the grinding plate 33 and the sample 9 increases, thus achieving good clamping and positioning and effectively preventing the sample 9 from slipping during the tearing process.

[0028] In the tearing experiment of the sample 9, its surface needs to be pre-cut so that the sample 9 can be torn at the required position. Therefore, during the process of the motor 22 driving the cam 23 to rotate, it will also drive the gear 41 to rotate. The gear 41 drives the connecting rod 43 to rise in the side groove 25 through the rack 42, thereby driving the marker pen 44 and the pre-cutting knife 45 at the end of the connecting rod 43 to rise (it should be noted that the pre-cutting knife 45 is installed on the connecting rod 43 inside the clamping seat 21 on the swing plate 14, and the pre-cutting knife 45 is not installed on the connecting rod 43 inside the other clamping seat 21). The marker pen 44 draws a line on the surface of the sample 9 along the side edge of the base 11 to make a mark, which is convenient for manual observation of the mark offset after the detection to judge whether there is a slipping problem; the pre-cutting knife 45 cuts the sample 9 to form a pre-cut for subsequent tearing detection.

[0029] Finally, the release device 12 is retracted into the base 11 through the control device in the base 11, and the swing plate 14 swings freely under its own gravity, driving the fixing mechanism 2 to swing and tearing the sample 9 until the swing plate 14 stops swinging freely. After the test is completed, the mark is manually observed to see if it is deflected too much. If it is deflected too much, it means that the sample 9 has a slip problem. If the deflection is within a reasonable range, it means that there is no slip problem in this test. Once a slip problem occurs, the test data is invalid, and the air pressure of the pneumatic push rod 31 needs to be readjusted to increase the pressure of the splint 32. At the same time, the screw sleeve 36 on the surface of the splint 32 can be rotated to drive the stud 35 to move toward the inside of the splint 32, thereby pushing the grinding plate 33 to protrude further from the splint 32, thereby increasing the pressure on the sample 9 and reducing the occurrence of slip problems. After the test is completed, the pneumatic push rod 31 is controlled to drive the splint 32 to retract, remove the sample 9, and conduct the next test.

[0030] Example 2: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 12 , a striking mechanism 5 is installed inside one end of the clamping seat 21 and inside the splint 32. The striking mechanism 5 includes a pendulum 51 installed inside one end of the clamping seat 21 and inside the splint 32. The top of the pendulum 51 respectively contacts the surface of the corresponding cam 23 and the surface of the grinding plate 33. The bottom of the pendulum 51 installed in the splint 32 passes through the adjustment slot 39. A first shaft 52 is fixed on both sides of the pendulum 51. A first torsion spring 53 is sleeved on the first shaft 52. The pendulum 51 is elastically connected to the clamping seat 2 through the first torsion spring 53. 1 inside one end and inside the clamping plate 32, the bottom end of the pendulum 51 is rotatably connected to the toggle head 54, and the bottom end of the pendulum 51 installed inside the clamping plate 32 is slidably connected to the bottom groove 26. A lever 55 and a second shaft 56 are installed inside the inner side of the clamping seat 21. The second shaft 56 passes through the lever 55. A second torsion spring 57 is sleeved on the second shaft 56. The lever 55 is elastically connected to the second shaft 56 through the second torsion spring 57. One end of the lever 55 contacts the bottom end of the cam 23, and the other end of the lever 55 is fixed with a contact head 58.

[0031] Each time the sample 9 is clamped and roughened, a certain amount of PVA residue will be generated. Since the surfaces of the grinding disc 24 and the grinding plate 33 are relatively rough and they are the execution ends of the grinding of the sample 9, a large amount of residue is likely to remain on the contact surface of the grinding disc 24 and the grinding plate 33 with the sample 9. This residue not only affects the subsequent roughening effect, but also reduces the friction of the contact surface, resulting in insufficient holding force and making it more prone to slipping. Therefore, after each test is completed, the surface of the grinding disc 24 and the grinding plate 33 needs to be cleaned to remove the residue.

[0032] During the process of clamping the sample 9, the clamping plate 32 drives the bottom of the toggle bar 38 and the bottom end of the corresponding pendulum 51 to slide in the bottom groove 26.Figure 4 and instructions attached Figure 7 In the embodiment, the toggle head 54 at the bottom of the pendulum 51 inside the clamping base 21 and inside the clamping plate 32 rotate in different directions. As the clamping plate 32 slides toward the sample 9, the toggle head 54 at the bottom of the pendulum 51, which has passed through the adjustment slot 39, comes into contact with the toggle tooth 27 at the bottom of the bottom slot 26, causing the toggle head 54 to rotate and thus pass over the toggle tooth 27. At this time, the pendulum 51 does not swing. During this process, the toggle bar 38 also comes into contact with the toggle head 54 at the bottom of the pendulum 51 inside the clamping base 21, causing the toggle head 54 to rotate, thereby preventing the toggle bar 38 from driving the pendulum 51 inside the clamping base 21 to swing via the toggle head 54. After the tear strength test is completed, the clamp 32 is away from the sample 9. In this direction of movement, the toggle bar 38 is provided with a plurality of protrusions, which sequentially toggle the toggle head 54 inside the clamp 21. Due to the thrust of the toggle bar 38, the top surface of the toggle head 54 contacts the bottom end of the pendulum 51, resulting in the toggle head 54 being unable to rotate. Therefore, the thrust of the toggle bar 38 drives the pendulum 51 inside the clamp 21 to swing through the toggle head 54. The pendulum 51 rotates around the first axis 52, causing the first torsion spring 53 to store force. At the same time, the top of the pendulum 51 moves away from the cam 23. When the toggle head 54 swings over the mutually abutting bumps on the toggle bar 38, the elastic force of the first torsion spring 53 drives the pendulum 51 to swing back. The top of the pendulum 51 strikes the cam 23, generating vibrations that cause the PVA residue attached to the grinding plate 24 to fall off. At the same time, the toggle head 54 at the bottom of the pendulum 51 returns to its original position and is again abutted by the next bump. The above process is repeated, striking the cam 23 multiple times, improving the removal of PVA residue from the surface of the grinding plate 24. At the same time, the toggle head 54 at the bottom of the pendulum 51 inside the clamping plate 32 cooperates with the plurality of toggle teeth 27 at the bottom of the bottom groove 26, producing the same effect, causing the top of the pendulum 51 inside the clamping plate 32 to strike the grinding plate 33, shaking off the PVA residue attached to the grinding plate 33.

[0033] Example 3: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 12 A dust collecting mechanism 6 is provided at the bottom inner side of the clamping seat 21. The dust collecting mechanism 6 includes two dust collecting grooves 61 symmetrically arranged at the bottom inner side of the clamping seat 21. A storage bin 62 is provided inside the clamping seat 21 at one end of each dust collecting groove 61. The inner sliding groove of the clamping seat 21 at the connection between the dust collecting groove 61 and the corresponding storage bin 62 is movably connected to a closed door 63. A lifting port 64 is penetrated on the closed door 63. A second spring 65 is installed on the top surface of the closed door 63. The closed door 63 is elastically connected to the inside of the clamping seat 21 through the second spring 65.

[0034] A cleaning mechanism 7 is installed in the dust collection tank 61. The cleaning mechanism 7 includes two swing rods 71 symmetrically installed inside the bottom tank 26. Two third shafts 72 are also installed in the bottom tank 26, and the third shafts 72 penetrate the corresponding swing rods 71. A third torsion spring 73 is sleeved on the third shafts 72, and the swing rods 71 are elastically connected to the third shafts 72 through the third torsion springs 73. A translation plate 74 is installed at the other end of each dust collection tank 61. First sliders 76 are fixed to the tops of both ends of the translation plate 74. Vertical grooves 77 are provided at both ends of the translation plate 74. A sweeping plate 78 and a third spring 79 are installed inside the translation plate 74. The sweeping plate 78 is elastically connected to the inside of the translation plate 74 through the third spring 79, and the bottom of the sweeping plate 78 abuts against the bottom surface of the dust collection tank 61. A plug plate 75 is installed on the outside of the sweeping plate 78. Second sliders 791 are symmetrically installed at the tops of both ends of the sweeping plate 78, and the second sliders 791 are slidably connected in the corresponding vertical grooves 77.

[0035] Oscillation mechanisms 8 are arranged in the clamping seats 21 at both ends of each dust collection tank 61. The oscillation mechanisms 8 include smooth grooves 81 and inclined sliding grooves 83 symmetrically arranged on the clamping seats 21 at both ends of the dust collection tank 61. The first sliders 76 are slidably connected in the corresponding smooth grooves 81. The second sliders 791 are slidably connected in the corresponding inclined sliding grooves 83. A fourth spring 82 is installed in the smooth groove 81, and one end of the fourth spring 82 is installed on the first slider 76. A number of inner sliding grooves 84 are equidistantly arranged in the inclined sliding grooves 83. A bump 85 is slidably connected in each inner sliding groove 84. A fifth spring 86 is also installed in the inner sliding groove 84, and one end of the fifth spring 86 is installed on the side of the bump 85.

[0036] PVA residue that falls on the inner bottom of the clamp 21 still needs to be cleaned up promptly. Because each time the tearing process is simulated, the swing plate 14 will drive the corresponding clamp 21 to swing. If not handled in time, PVA residue may be scattered and pollute the surrounding environment. Therefore, two dust collection troughs 61 are symmetrically arranged on the inner bottom of the clamp 21. The residue that falls during the polishing process of the sample 9 will fall into the dust collection troughs 61. The bottom of the dust collection trough 61 is designed as an inclined surface, which can easily guide the residue to the deep part of the dust collection trough 61. It also increases the difficulty of PVA residue overflowing, preventing the residue from overflowing from the dust collection trough 61 during the swinging process of the swing plate 14 driving the clamp 21. When the clamp 32 is not close to the sample 9, that is, when the toggle bar 38 is not sliding, the elastic force of the third torsion spring 73 on the third shaft 72 causes the swing arm 71 to open at its maximum angle (referring to the opening angle of the long side of the swing arm 71). The swing arm 71 pushes the translating plate 74 in the dust collection trough 61 to a position close to the closed door 63, and the first slider 76 sliding in the smooth groove 81 compresses the fourth spring 82. As the clamp 32 approaches the sample 9, the toggle bar 38 contacts and pushes the short side of the swing arm 71, causing the swing arm 71 to rotate about the third shaft 72 and allowing the third torsion spring 73 to accumulate force. The opening angle of the swing arm 71 gradually decreases. Under the push of the fourth spring 82, the translating plate 74 and the sweeping plate 78 return to their initial positions, that is, the end of the dust collection trough 61 close to the toggle bar 38. After the tear strength test is completed, the clamping plate 32 drives the toggle bar 38 back, releasing the rocker arm 71. The elastic force of the third torsion spring 73 causes the rocker arm 71 to expand again, pushing the translation plate 74 toward the closed door 63. The first slider 76 slides within the smooth groove 81, compressing the fourth spring 82. Simultaneously, the second slider 791 slides within the inclined groove 83, causing the sweeping plate 78 to gradually slide out of the translation plate 74. The second slider 791 also slides within the sweeping plate 78, ensuring that the bottom of the sweeping plate 78 always contacts the bottom surface of the dust collection trough 61 (the bottom of the sweeping plate 78 is provided with bristles). As the sweeping plate 78 slides out, the third spring 79 extends, sweeping the sweeping plate 78 across the bottom surface of the dust collection trough 61, sweeping all the remaining PVA residue into the deepest part of the dust collection trough 61. When the sweeping plate 78 moves to the deepest part of the dust collecting trough 61, the inserting plate 75 on the side of the sweeping plate 78 penetrates into the lifting opening 64 of the closed door 63. The top surface of the lifting opening 64 is an inclined surface. As the inserting plate 75 is inserted into the lifting opening 64, the closed door 63 gradually rises, compressing the second spring 65. Finally, the dust collecting trough 61 is connected with the storage bin 62, and the PVA residue collected by the sweeping plate 78 is all transferred to the storage bin 62, reducing the time that the PVA residue stays in the dust collecting trough 61 and preventing the PVA residue from being spilled due to the swing of the clamping seat 21.

[0037] As the clamping plate 32 clamps the sample 9 again, the translation plate 74 and the sweeping plate 78 return to their initial positions. After the sweeping plate 78 drives the inserting plate 75 to disengage from the lifting port 64, the closed door 63, under the elastic force of the second spring 65, closes the storage bin 62 again to prevent the PVA residue in the storage bin 62 from overflowing. As the sweeping plate 78 approaches the closed door 63, the second slider 791 slides in the inclined chute 83 and contacts the protrusion 85 in the inclined chute 83, causing the protrusion 85 to slide along the inner chute 84, compressing the fifth spring 86. The protrusion 85 gradually penetrates into the inner chute 84 and finally penetrates completely, allowing the second slider 791 to pass smoothly, thereby preventing the bottom of the sweeping plate 78 from separating from the bottom surface of the dust collecting trough 61 and preventing incomplete cleaning of the PVA residue. When the second slider 791 passes, the protrusion 85 loses pressure and, under the elastic force of the first slider 76, the protrusion 85 returns to its initial position. As the sweeping plate 78 moves away from the closed door 63, the second slider 791 contacts the other side of each protrusion 85. Since the protrusion 85 is stuck in the end of the inner slide groove 84 and cannot continue to slide, the second slider 791 blocked by the protrusion 85 rises and passes over the protrusion 85, achieving the effect of temporarily raising the sweeping plate 78, so that its bottom is separated from the dust collecting trough 61, avoiding bringing back the residual PVA residue. In addition, the second slider 791 drives the sweeping plate 78 to rise and fall, causing the sweeping plate 78 to vibrate, shaking off the PVA residue attached to the bristles at the bottom of the sweeping plate 78, thereby improving the cleanliness of the bristles of the sweeping plate 78.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A device for detecting the strength of a polyvinyl alcohol packaging film, comprising a fixing mechanism (2), characterized in that: The fixing mechanism (2) comprises a clamping seat (21), a motor (22) is mounted on one end of the clamping seat (21), a cam (23) is mounted inside the clamping seat (21), an output shaft of the motor (22) is mounted on one side of the cam (23), and a grinding disc (24) is mounted on the other side of the cam (23); A clamping mechanism (3) is installed at the other end of the clamping seat (21), and the clamping mechanism (3) includes a pneumatic push rod (31) installed at the other end of the clamping seat (21). A clamping plate (32) is installed at the output end of the pneumatic push rod (31), and the clamping plate (32) is slidably connected to the inner side of the clamping seat (21). A grinding plate (33) is installed inside one side of the clamping plate (32); A marking mechanism (4) is installed inside the clamping seat (21), and the marking mechanism (4) includes a gear (41) installed on the output shaft of the motor (22). A rack (42) is slidably connected inside the clamping seat (21), and the rack (42) is meshedly connected to the gear (41). One end of a connecting rod (43) is installed on the side of the rack (42), and a marking pen (44) is installed on the other end of the connecting rod (43).

2. The polyvinyl alcohol packaging film strength detection device according to claim 1, characterized in that: The clamping seat (21) is mounted on the detection mechanism (1), and the detection mechanism (1) comprises a base (11). A release device (12) and a support column (13) are mounted on the top surface of the base (11). The top side surface of the support column (13) is rotatably connected to a swing plate (14). The side walls of the support column (13) and the swing plate (14) are both provided with connecting arms (15), and the end of each connecting arm (15) is mounted with a clamping seat (21).

3. The polyvinyl alcohol packaging film strength detection device according to claim 1, wherein: The fixing mechanism (2) further comprises a side groove (25) provided on the side of the clamping seat (21), the connecting rod (43) being slidably connected in the side groove (25), a bottom groove (26) being provided in the middle of the inner side of the clamping seat (21), and a plurality of shifting teeth (27) being provided inside the bottom groove (26).

4. The polyvinyl alcohol packaging film strength detection device according to claim 3, wherein: The clamping mechanism (3) further comprises an adjusting block (34) mounted on the surface of the grinding plate (33), a stud (35) being movably connected to the inner sliding groove of the splint (32), and the adjusting block (34) being slidably connected to the inside of the stud (35), a first spring (37) being mounted inside the stud (35), the adjusting block (34) being elastically connected to the inside of the stud (35) via the first spring (37), a screw sleeve (36) being rotatably connected to the other side of the splint (32), the screw sleeve (36) being threadedly connected to the outside of the stud (35), a toggle bar (38) being mounted on the bottom of the splint (32), the toggle bar (38) being slidably connected to the bottom groove (26), and an adjusting groove (39) being provided at one end of the toggle bar (38) close to the splint (32).

5. The polyvinyl alcohol packaging film strength detection device according to claim 1, characterized in that: The marking mechanism (4) further comprises a pre-cutter (45) installed at the end of the connecting rod (43) in one of the clamping seats (21), and only the marking pen (44) is installed at the end of the connecting rod (43) in the other clamping seat (21).

6. The polyvinyl alcohol packaging film strength detection device according to claim 3, wherein: A striking mechanism (5) is installed inside one end of the clamping seat (21) and inside the clamping plate (32). The striking mechanism (5) includes a pendulum (51) installed inside one end of the clamping seat (21) and inside the clamping plate (32). The top of the pendulum (51) respectively contacts the surface of the corresponding cam (23) and the surface of the grinding plate (33). The bottom of the pendulum (51) installed in the clamping plate (32) passes through the adjusting slot (39). First shafts (52) are fixed on both sides of the pendulum (51). A first torsion spring (53) is sleeved on the first shaft (52). The pendulum (51) is elastically connected to the clamping seat (21) through the first torsion spring (53). ) inside one end and inside the splint (32), the bottom end of the pendulum (51) is rotatably connected to the toggle head (54), and the bottom end of the pendulum (51) installed inside the splint (32) is slidably connected to the bottom groove (26), and a lever (55) and a second shaft (56) are installed inside the inner side of the clamping seat (21), the second shaft (56) passes through the lever (55), and a second torsion spring (57) is sleeved on the second shaft (56), and the lever (55) is elastically connected to the second shaft (56) through the second torsion spring (57), one end of the lever (55) contacts the bottom end of the cam (23), and the other end of the lever (55) is fixed with a contact head (58).

7. The polyvinyl alcohol packaging film strength detection device according to claim 3, wherein: A dust collecting mechanism (6) is provided at the bottom inner side of the clamping seat (21), and the dust collecting mechanism (6) includes two dust collecting grooves (61) symmetrically provided at the bottom inner side of the clamping seat (21). A storage bin (62) is provided inside the clamping seat (21) at one end of each dust collecting groove (61). A closed door (63) is movably connected to the sliding groove in the clamping seat (21) at the connection between the dust collecting groove (61) and the corresponding storage bin (62). A lifting port (64) is provided through the closed door (63). A second spring (65) is installed on the top surface of the closed door (63), and the closed door (63) is elastically connected to the inside of the clamping seat (21) through the second spring (65).

8. The polyvinyl alcohol packaging film strength detection device according to claim 7, characterized in that: A cleaning mechanism (7) is installed in the dust collection tank (61). The cleaning mechanism (7) includes two swing rods (71) symmetrically installed inside the bottom tank (26). Two third shafts (72) are also installed in the bottom tank (26), and the third shafts (72) penetrate through the corresponding swing rods (71). A third torsion spring (73) is sleeved on the third shafts (72), and the swing rods (71) are elastically connected to the third shafts (72) through the third torsion springs (73). A translation plate (74) is installed at the other end of each dust collection tank (61). First sliders (76) are fixed at the tops of both ends of the translation plate (74). Vertical grooves (77) are provided at both ends of the translation plate (74). A sweeping plate (78) and a third spring (79) are installed inside the translation plate (74). The sweeping plate (78) is elastically connected to the inside of the translation plate (74) through the third spring (79), and the bottom of the sweeping plate (78) abuts against the bottom surface of the dust collection tank (61). A plug plate (75) is installed on the outside of the sweeping plate (78). Second sliders (791) are symmetrically installed at the tops of both ends of the sweeping plate (78), and the second sliders (791) are slidably connected to the corresponding vertical grooves (77).

9. The polyvinyl alcohol packaging film strength detection device according to claim 8, characterized in that: An oscillation mechanism (8) is arranged in the clamping seats (21) at both ends of each dust collection tank (61). The oscillation mechanism (8) includes a smooth groove (81) and an inclined chute (83) symmetrically arranged on the clamping seats (21) at both ends of the dust collection tank (61). The first slider (76) is slidably connected to the corresponding smooth groove (81). The second slider (791) is slidably connected to the corresponding inclined chute (83). A fourth spring (82) is installed in the smooth groove (81), and one end of the fourth spring (82) is installed on the first slider (76). A plurality of inner chutes (84) are equidistantly arranged in the inclined chute (83). A convex block (85) is slidably connected in each inner chute (84). A fifth spring (86) is also installed in the inner chute (84), and one end of the fifth spring (86) is installed on the side surface of the convex block (85).

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