Polyolefin shrink film strength testing device
By using a press roller design in the polyolefin shrink film strength test device, the measurement error problem caused by the existing test device due to membrane toughness and flatness is solved, and a higher accuracy puncture strength test is achieved.
Patent Information
- Application Number
- CN202421822688.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-30
AI Technical Summary
The existing polyolefin shrink film puncture strength testing devices are susceptible to the toughness and flatness of the film during the test, resulting in measurement errors.
A polyolefin shrink film strength test device is designed, and two press rollers are rotatably installed on both sides of the puncture needle. The press roller is in contact with the puncture needle and the polyolefin shrink film, which pushes the film to unfold and fixes its position, ensuring that the puncture needle falls vertically, thereby improving the accuracy of the test.
Through the design of the press roller, the polyolefin shrink film can be fully expanded during puncture, reducing measurement errors, improving the accuracy of puncture strength tests, and supporting multiple consecutive tests to reduce the impact of errors.
Smart Images
Figure CN223021879U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polyolefin shrink film production, in particular to a polyolefin shrink film strength testing device. Background Technique
[0002] The polyolefin shrink film is a kind of heat shrinkable film, mainly used for packaging products with regular and irregular shapes. Due to its non-toxic environmental protection, high transparency, high shrinkage rate, good heat sealing performance, high gloss, strong toughness, tear resistance, uniform heat shrinkage and suitability for full-automatic high-speed packaging and other characteristics, it is a replacement product of the traditional PVC heat shrinkable film.
[0003] When producing polyolefin shrink film, in order to ensure product quality, sampling tests need to be carried out on it. Among them, the puncture strength test is one of the important test items. When the existing puncture strength test device is used, it mostly pushes the puncture needle downward towards the polyolefin shrink film through a pushing mechanism, and obtains the puncture strength of the polyolefin shrink film under the data measurement of the pressure sensor. However, during the puncture process, the puncture effect may be affected due to the toughness of the polyolefin shrink film itself and the flatness during placement, resulting in measurement errors and other situations. Content of the Utility Model
[0004] The purpose of the utility model is to solve the above-mentioned disadvantages existing in the prior art, and to propose a polyolefin shrink film strength testing device.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: Design a polyolefin shrink film strength testing device, including a base. At one end of the base, there is an installation roller, and the end of the installation roller is rotatably installed on the first fixing seat, and the first fixing seat is installed on the base. At the other end of the base, there is a winding roller, and the ends of the winding roller are rotatably installed on the second fixing seat, and the second fixing seat is installed on the base. And at one end of the winding roller, there is also a driving motor installed, and the driving motor is installed on the second fixing seat;
[0006] On the top of the base, there is a placement table. In the middle of the placement table, there is a through hole penetrating the top of the placement table. Above the through hole, there is a puncture needle coaxially arranged. At the top of the puncture needle, there is a pressure sensor installed, and the pressure sensor is installed on the mounting seat, and the mounting seat is installed on the bottom of the support plate. And at the top of the support plate, there is a pushing mechanism vertically installed, and the pushing mechanism is connected to the base through an L-shaped bracket;
[0007] Rotating shafts are arranged in parallel below both ends of the support plate. The ends of the rotating shafts are rotatably installed on the third fixed seats, and the third fixed seats are fixed on the support plate. Pressing rollers are arranged in parallel below the rotating shafts. Connecting plates are installed at the ends of the pressing rollers. The top of the connecting plate is fixed to the rotating shaft, and the connecting plate is inclined, so that the two pressing rollers are arranged to expand outward below the support plate. Among them, the orthographic projection of the pressing roller is located below the puncture needle;
[0008] A torsion spring is also sleeved on the end of the rotating shaft. One end of the torsion spring is fixed on the third fixed seat, and the other end of the torsion spring is fixed on the connecting plate.
[0009] Preferably, a control box is installed on one side of the base away from the L-shaped bracket. A display and control buttons are installed on the top of the control box. A controller is arranged inside the control box. The controller is respectively connected to the display, the control buttons, the drive motor, the pushing mechanism, and the pressure sensor through wires.
[0010] Preferably, the top surface of the placement table is a smooth surface, and first guide rollers are installed at both top ends of the placement table;
[0011] Grooves are opened at both top ends of the base. The top of the groove corresponds to the placement table, and the installation roller and the winding roller both correspond to the bottom of the groove. Second guide rollers are also arranged in the groove, and the ends of the second guide rollers are fixed to the ends of the groove.
[0012] Preferably, a first limiting plate is installed at the center of the top of the rotating shaft. The first limiting plate is arranged along the radial direction of the rotating shaft. Second limiting plates are correspondingly arranged on both sides where the two first limiting plates are relatively close to each other, and the top of the second limiting plate is fixed to the support plate.
[0013] Preferably, the surface of the pressing roller is a smooth surface.
[0014] Preferably, at least one guide shaft is arranged on the side of the pushing mechanism. The bottom of the guide shaft is vertically fixed to the support plate, and the top of the guide shaft slidably penetrates through the L-shaped bracket.
[0015] Preferably, a strip-shaped elastic pressing piece is arranged on the side of the winding roller. The elastic pressing piece is arranged along the axial direction of the winding roller, and the end of the elastic pressing piece is detachably installed at the end of the winding roller.
[0016] The beneficial effects of the design scheme proposed by the present utility model in the application process are as follows:
[0017] 1. The puncture strength testing device for the polyolefin shrink film is installed by rotating two pressure rollers on both sides of the puncture needle. When the puncture needle drops for puncture, the pressure rollers will first contact the puncture needle and the polyolefin shrink film, and deflect and move towards both ends of the placement table along with the downward thrust, thereby pushing the polyolefin shrink film to expand towards both ends with the through hole as the center. In this way, the polyolefin shrink film can be fully expanded during puncture, enabling the puncture needle to vertically fall on the polyolefin shrink film for puncture testing, improving the accuracy of the test.
[0018] 2. The puncture strength testing device for the polyolefin shrink film can wind the polyolefin shrink film to be tested on it through the installation roller, and fix the other end of the polyolefin shrink film on the winding roller. By rotating the winding roller, the polyolefin shrink film can move on the top surface of the placement table, so as to conduct continuous and multiple puncture tests on the polyolefin shrink film, and then facilitate data comparison of multiple groups of tests to reduce the influence of errors on the test results. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 Structural schematic of the present utility model Figure 1 ;
[0020] Figure 2 Structural schematic of the present utility model Figure 2 ;
[0021] Figure 3 Front view of the present utility model;
[0022] Figure 4 Side view of the present utility model;
[0023] Figure 5 Structural diagram of the bottom of the support plate of the present utility model.
[0024] In the figure: 1. Base; 2. Placement table; 3. Through hole; 4. Pushing mechanism; 5. L-shaped bracket; 6. Support plate; 7. Mounting seat; 8. Pressure sensor; 9. Puncture needle; 10. Rotating shaft; 11. Third fixing seat; 12. Connecting plate; 13. Pressure roller; 14. Torsion spring; 15. Guide shaft; 16. Groove; 17. First guide roller; 18. Second guide roller; 19. Installation roller; 20. First fixing seat; 21. Winding roller; 22. Second fixing seat; 23. Driving motor; 24. Elastic pressing piece; 25. Control box; 26. First limiting plate; 27. Second limiting plate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0026] Reference Figures 1-5 Figures 1-5 , a polyolefin shrink film strength testing device, including a base 1. An installation roller 19 is provided at one end of the base 1. The end of the installation roller 19 is rotatably installed on a first fixed seat 20, and the first fixed seat 20 is installed on the base 1. A winding roller 21 is provided at the other end of the base 1. The ends of the winding roller 21 are rotatably installed on a second fixed seat 22, and the second fixed seat 22 is installed on the base 1. And a driving motor 23 is also installed at one end of the winding roller 21, and the driving motor 23 is installed on the second fixed seat 22. A placing table 2 is installed on the top of the base 1, and the top surface of the placing table 2 is a smooth surface. When it is necessary to perform a puncture test on the polyolefin shrink film, the polyolefin shrink film to be tested can be first wound around the installation roller 19, then one end of the polyolefin shrink film is passed through above the placing table 2, and then it is fixed on the winding roller 21. In this way, the polyolefin shrink film can be moved above the placing table 2 for automatic and continuous puncture tests.
[0027] Among them, a strip-shaped elastic pressing piece 24 is provided on the side surface of the winding roller 21. The elastic pressing piece 24 is arranged along the axial direction of the winding roller 21, and the end of the elastic pressing piece 24 is detachably installed on the end of the winding roller 21. One end of the polyolefin shrink film is placed on the winding roller 21, then the elastic pressing piece 24 is covered on the polyolefin shrink film, and is fixed by fasteners (which is one of bolts or screws) at both ends, so as to realize the fixation of the polyolefin shrink film on the winding roller 21.
[0028] Such as Figure 1 and Figure 2 As shown in
[0029] Such as Figure 1 and Figure 3As shown in the figure, a through hole 3 penetrating the top of the placing table 2 is provided in the middle of the placing table 2. A puncture needle 9 is coaxially provided above the through hole 3. A pressure sensor 8 is installed at the top of the puncture needle 9. The pressure sensor 8 is installed on the mounting seat 7. The mounting seat 7 is installed on the bottom of the support plate 6. The top of the support plate 6 is vertically installed with a pushing mechanism 4. The pushing mechanism 4 is connected to the base 1 through an L-shaped bracket 5. In the actual use process, the pushing mechanism 4 is one of a hydraulic cylinder, an electric push rod, and a cylinder. After the polyolefin shrink film is laid flat on the placing table 2, the pushing mechanism 4 will push the puncture needle 9 to drop, so as to puncture through the polyolefin shrink film. During the puncture process, the force when the puncture needle 9 contacts the polyolefin shrink film will be transmitted to the pressure sensor 8 to measure the magnitude of the force and obtain the puncture strength of the polyolefin shrink film.
[0030] Below the two ends of the support plate 6, rotating shafts 10 are arranged in parallel. The ends of the rotating shafts 10 are rotatably installed on the third fixing seats 11. The third fixing seats 11 are fixed on the support plate 6. Below the rotating shafts 10, pressing rollers 13 are arranged in parallel. The ends of the pressing rollers 13 are installed with connecting plates 12. The top of the connecting plate 12 is fixed to the rotating shaft 10, and the connecting plate 12 is inclined, so that the two pressing rollers 13 are arranged to expand outwards below the support plate 6. Among them, the orthographic projection of the pressing roller 13 is located below the puncture needle 9; A torsion spring 14 is also sleeved on the end of the rotating shaft 10. One end of the torsion spring 14 is fixed on the third fixing seat 11, and the other end of the torsion spring 14 is fixed on the connecting plate 12. During the downward pressing process of the puncture needle 9, the pressing roller 13 will contact the placing table 2 prior to the puncture needle 9. As the puncture needle 9 continues to drop, the pressing roller 13 deflects around the rotating shaft 10. During this process, the pressing roller 13 will always press on the placing table 2 due to the elastic action of the torsion spring 14. In this way, the pressing roller 13 will slide along the surface of the placing table 2, so as to push the polyolefin shrink film placed on the placing table 2, so as to expand the polyolefin shrink film to both sides with the through hole 3 as the center and realize the tensioning of the polyolefin shrink film, so that the puncture needle 9 can penetrate the polyolefin shrink film instantly when contacting the polyolefin shrink film, and then obtain the puncture strength to make the test result more accurate.
[0031] Specifically, during use, the winding of the polyolefin shrink film by the winding roller 21 will realize the continuous puncture test of the polyolefin shrink film. After the previous puncture, there will be a perforation on the polyolefin shrink film, and the existing perforation will have an impact on the stress of the subsequent puncture. Therefore, after the pressing roller 13 presses down, a restrictive acting force will be generated on the polyolefin shrink film, which can make the stress during the puncture of the polyolefin shrink film concentrate within the range between the two pressing rollers 13, so as to reduce the influence of the previous perforation on the subsequent puncture, thereby further improving the accuracy of the test result.
[0032] It should be noted that, in order to ensure that the two pressure rollers 13 are always inclined outward away from one side of the support plate 6, as Figure 4 and Figure 5 shown, a first limit plate 26 is installed at the central top of the rotating shaft 10. The first limit plate 26 is arranged along the radial direction of the rotating shaft 10. And on both sides of the two first limit plates 26 close to each other, second limit plates 27 are correspondingly provided. The top of the second limit plate 27 is fixed to the support plate 6. After the puncture needle 9 is lifted, the pressure roller 13 will rotate reversely under the elastic action of the torsion spring 14. And during the reverse rotation of the pressure roller 13, the first limit plate 26 will contact the second limit plate 27, so as to limit the reverse rotation of the pressure roller 13 and make the two pressure rollers 13 always maintain an outward-expanded state for subsequent continuous puncture operations.
[0033] Furthermore, the surface of the pressure roller 13 is a smooth surface, that is, a smooth metal shell or plastic shell is installed on the surface of the pressure roller 13 to facilitate the sliding of the pressure roller 13 on the polyolefin shrink film.
[0034] It should be further noted that at least one guide shaft 15 is provided on the side of the pushing mechanism 4. The bottom of the guide shaft 15 is vertically fixed to the support plate 6, and the top of the guide shaft 15 slidably penetrates through the L-shaped bracket 5, which can provide a guiding function for the lifting of the puncture needle 9 when the puncture needle 9 is lifted and lowered, so that the downward puncture process of the puncture needle 9 is more stable.
[0035] A control box 25 is installed on one side of the base 1 away from the L-shaped bracket 5. A display and control buttons are installed on the top of the control box 25. A controller is arranged in the control box 25. The controller is respectively connected to the display, the control buttons, the drive motor 23, the pushing mechanism 4, and the pressure sensor 8 through wires. In the actual use process, the controller is a PLC logic controller, a control main board, or a control host. The operator can control the controller through the control buttons, and then control the test device. And the data measured by the pressure sensor 8 will be fed back to the display through the controller for the operator to read the data.
[0036] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.
Claims
1. A polyolefin shrink film strength testing device, characterized in that: The invention comprises a base (1), a mounting roller (19) is provided at one end of the base (1), an end of the mounting roller (19) is rotatably mounted on a first fixed seat (20), the first fixed seat (20) is mounted on the base (1), a winding roller (21) is provided at the other end of the base (1), the end of the winding roller (21) is rotatably mounted on a second fixed seat (22), the second fixed seat (22) is mounted on the base (1), and a driving motor (23) is also installed at one end of the winding roller (21), and the driving motor (23) is mounted on the second fixed seat (22); A placing platform (2) is installed on the top of the base (1), a through hole (3) penetrating the top of the placing platform (2) is opened in the middle of the placing platform (2), a puncture needle (9) is coaxially arranged above the through hole (3), a pressure sensor (8) is installed on the top of the puncture needle (9), the pressure sensor (8) is installed on the mounting seat (7), the mounting seat (7) is installed on the bottom of the support plate (6), and a pushing mechanism (4) is vertically installed on the top of the support plate (6), and the pushing mechanism (4) is connected to the base (1) through an L-shaped bracket (5); A rotating shaft (10) is arranged in parallel below both ends of the support plate (6), and the end of the rotating shaft (10) is rotatably mounted on a third fixed seat (11), and the third fixed seat (11) is fixed on the support plate (6). A pressing roller (13) is arranged in parallel below the rotating shaft (10), and a connecting plate (12) is installed at the end of the pressing roller (13). The top of the connecting plate (12) is fixed to the rotating shaft (10), and the connecting plate (12) is arranged in an inclined manner so that the two pressing rollers (13) are arranged to spread outwards below the support plate (6), wherein the formal projection of the pressing roller (13) is located below the puncture needle (9); A torsion spring (14) is sleeved on the end of the rotating shaft (10), one end of the torsion spring (14) is fixed on the third fixing seat (11), and the other end of the torsion spring (14) is fixed on the connecting plate (12).
2. A polyolefin shrink film strength testing device according to claim 1, characterized in that: A control box (25) is installed on a side of the base (1) away from the L-shaped bracket (5), a display and control buttons are installed on the top of the control box (25), and a controller is arranged inside the control box (25). The controller is connected to the display, the control buttons, the drive motor (23), the pushing mechanism (4), and the pressure sensor (8) through wires.
3. A polyolefin shrink film strength testing device according to claim 1, characterized in that: The top surface of the placement platform (2) is a smooth surface, and first guide rollers (17) are installed on the tops of both ends of the placement platform (2); Slots (16) are provided at both ends of the top of the base (1), the top of the slot (16) corresponds to the placement table (2), and the installation roller (19) and the winding roller (21) correspond to the bottom of the slot (16). A second guide roller (18) is also provided in the slot (16), and the end of the second guide roller (18) is fixed to the end of the slot (16).
4. A polyolefin shrink film strength testing device according to claim 1, characterized in that: A first limiting plate (26) is installed at the center of the top of the rotating shaft (10), and the first limiting plate (26) is arranged along the radial direction of the rotating shaft (10), and a second limiting plate (27) is correspondingly arranged on the side where the two first limiting plates (26) are relatively close to each other, and the top of the second limiting plate (27) is fixed to the support plate (6).
5. The polyolefin shrink film strength testing device according to claim 1, characterized in that: The surface of the pressure roller (13) is provided with a smooth outer shell.
6. A polyolefin shrink film strength testing device according to claim 1, characterized in that: At least one guide shaft (15) is provided on the side of the pushing mechanism (4), the bottom of the guide shaft (15) is vertically fixed on the support plate (6), and the top of the guide shaft (15) slides through the L-shaped bracket (5).
7. A polyolefin shrink film strength testing device according to claim 1, characterized in that: A strip-shaped elastic pressing sheet (24) is provided on the side of the winding roller (21). The elastic pressing sheet (24) is arranged along the axial direction of the winding roller (21), and the end of the elastic pressing sheet (24) is detachably mounted on the end of the winding roller (21).