Stretching film strength stretching test device

Abstract

The tensile film strength tensile testing device comprises a bottom plate, the upper end of the bottom plate is fixedly connected with a first shell, a moving mechanism is arranged in the first shell, and a fixing mechanism is arranged in a second shell. According to the tensile film strength tensile testing device, through cooperation of the moving mechanisms and the fixing mechanisms, synchronous movement of the two fixing mechanisms can be achieved through gear matching between the moving mechanisms, and compared with manual testing of workers, the testing is more accurate, so that the comparison accuracy is improved; an output shaft of a second motor rotates to drive a cam to rotate so as to drive a straight rod to move downwards, and the straight rod is limited by a second shell to linearly move, so that fixation is tighter, the stretch film is fixed, a worker does not need to rotate an adjusting rod, operation is more convenient, time is saved, and working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of tensile testing technology for stretch film strength, and in particular to a tensile testing device for stretch film strength. Background Technology

[0002] Stretch film, also known as LLDPE elastic film / packaging film, is a transparent, elastic, strong, non-toxic, and harmless soft polyethylene plastic film that meets international environmental and hygiene standards. LLDPE stretch film has the advantages of being tough, impact-resistant, transparent, and self-adhesive. Whether used for bulk packaging of products or palletizing goods, it can prevent moisture and dust, reduce labor, improve efficiency, and achieve the purpose of protecting products and reducing costs.

[0003] For example, a high-strength tensile film strength testing device with announcement number CN219265891U involves a tensile testing mechanism slidably installed at both ends inside the operating table. Two sets of tensile films are fixed within the fixing mechanism at the end of the fixing plate and the tensile testing mechanism, respectively. When the drive device operates, it moves one end of the tensile film via a connecting plate, allowing for tensile strength testing. Simultaneous testing of two sets of tensile films improves the accuracy and efficiency of the tensile strength test, thus benefiting user experience. However, this high-strength tensile film strength testing device uses two drive devices to pull two tensile films for the test. The operator must activate both drive devices, which cannot guarantee synchronous activation, potentially leading to inconsistent stretching rates and affecting the accuracy of test result comparisons. Furthermore, the device requires manual adjustment of the adjusting rod to fix the tensile film, which is cumbersome, increases operation time, and reduces work efficiency. Summary of the Invention

[0004] This invention aims to solve the problems existing in the prior art by providing a tensile testing device for stretch film strength. By using a moving mechanism to drive two fixed mechanisms to move synchronously, the device improves the accuracy of comparison. The fixed mechanism fixes the stretch film, eliminating the need for manual fixing by staff, thus saving time and improving work efficiency.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This tensile film strength tensile testing device includes a base plate, a first outer shell is fixedly connected to the upper end of the base plate, a moving mechanism is provided inside the first outer shell, the inner wall of the first outer shell is slidably connected to two supports, a vertical plate is fixedly connected to the middle of the upper end of the base plate, a second outer shell is fixedly connected to the inner side of the outer wall of each support, a second outer shell is fixedly connected to both sides of the outer wall of the vertical plate, and a fixing mechanism is provided inside each of the second outer shells.

[0006] To further improve the mechanism, the moving mechanism includes a first motor, the output shaft of which is fixedly connected to a first gear. The outer wall of the first gear meshes with a second gear. The rotating shafts of both the second gear and the first gear are rotatably connected to the first housing via bearings. The rotating shaft of the second gear is fixedly connected to a double-ended stud. The outer walls on both sides of the double-ended stud are threadedly connected to a slider. The lower end of the slider is slidably connected to the first housing.

[0007] To further improve the design, the upper end of each slider is fixedly connected to a bracket, and the outer wall of the first motor is fixedly connected to the first outer shell.

[0008] Further improvements include a second motor and a horizontal block. The output shaft of the second motor is fixedly connected to a cam. The outer wall of the cam abuts against a straight rod. The outer walls of both sides of the straight rod are slidably connected to the second outer shell. A spring is sleeved on the outer wall of the straight rod. The two ends of the spring are fixedly connected to the second outer shell and the straight rod, respectively. A pressure plate is fixedly connected to the lower end of the straight rod.

[0009] Further improvements include fixing the outer wall of the horizontal block to the bracket and the vertical plate respectively, and fixing the outer wall of the second motor to the second outer casing.

[0010] The beneficial effects of this utility model are as follows: Through the cooperation of the moving mechanism and the fixing mechanism, the rotation of the first gear drives the synchronous rotation of the second gear, which in turn drives the synchronous rotation of the two double-ended studs. The rotation of the double-ended studs causes the sliders on both sides to move inwards, which in turn causes the brackets to move inwards. The inward movement of the brackets then causes the two fixing mechanisms to move inwards. After moving to the appropriate position, the first motor stops. The operator then fixes the other ends of the two stretch films onto the fixing mechanisms driven by the brackets according to the above working method. Then, the first motor is controlled to rotate in the opposite direction. This reverse rotation causes the sliders on both sides to move outwards, thereby causing the two brackets to move outwards. The outward movement of the two brackets then causes the fixing mechanisms to move outwards, pulling the stretch film until one set of stretch films breaks. After this, the first motor stops. The gear matching between the moving mechanisms enables the synchronous movement of the two fixing mechanisms, which is more accurate than manual testing by the operator, thus improving the accuracy of the comparison.

[0011] Through the cooperation of the fixing mechanism and the second housing, the output shaft of the second motor rotates, driving the cam to rotate, which in turn drives the straight rod to move downward. The straight rod is limited by the second housing to move linearly. As the straight rod moves downward, it drives the pressure plate to move downward, compressing the spring. The spring keeps the straight rod pressed against the cam. The pressure plate moves downward and presses the stretching film into the groove machined on the horizontal block. The lower end of the pressure plate presses the stretching film tightly against the groove of the horizontal block. This fixation is tighter and achieves the fixation of the stretching film. It is more convenient and saves time and improves work efficiency by eliminating the need for operators to rotate the adjustment rod. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 for Figure 1 A front sectional view;

[0014] Figure 3 This is a left sectional view of the moving mechanism;

[0015] Figure 4 This is a right-side sectional view of the fixed mechanism;

[0016] Figure 5 for Figure 2 Schematic diagram of part A in the middle.

[0017] Explanation of reference numerals in the attached drawings: 1. Base plate, 2. First outer shell, 3. Moving mechanism, 301. First motor, 302. First gear, 303. Second gear, 304. Double-ended stud, 305. Slider, 4. Support, 5. Vertical plate, 6. Second outer shell, 7. Fixing mechanism, 701. Second motor, 702. Cam, 703. Straight rod, 704. Spring, 705. Pressure plate, 706. Horizontal block. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] See attached document Figure 1-5 :

[0020] In this embodiment, a tensile strength testing device for a stretch film includes a base plate 1. A first outer shell 2 is fixedly connected to the upper end of the base plate 1. The outer wall of the first outer shell 2 is machined with scale lines. A moving mechanism 3 is provided inside the first outer shell 2. The inner wall of the first outer shell 2 is slidably connected to two supports 4. The supports 4 are limited by the first outer shell 2 and move linearly. A vertical plate 5 is fixedly connected to the middle of the upper end of the base plate 1. A second outer shell 6 is fixedly connected to the inner side of the outer wall of each support 4. The movement of the supports 4 drives the movement of the second outer shell 6, thereby driving the movement of the fixing mechanism 7. The two sides of the outer wall of the vertical plate 5 are fixedly connected to the second outer shell 6. The second outer shell 6 is provided inside the second outer shell 6.

[0021] See attached document Figure 1-3 :

[0022] The moving mechanism 3 includes a first motor 301. The output shaft of the first motor 301 is fixedly connected to a first gear 302. The outer wall of the first gear 302 meshes with a second gear 303. The rotation of the output shaft of the first motor 301 drives the first gear 302 to rotate, thereby driving the second gear 303 to rotate. The two second gears 303 rotate synchronously and in the same direction. The rotation shafts of the second gear 303 and the first gear 302 are rotatably connected to the first housing 2 through bearings. The rotation shafts of the second gears 303 are fixedly connected to double-ended studs 304. The rotation of the second gears 303 drives the double-ended studs 304 to rotate. The outer walls on both sides of the double-ended studs 304 are threadedly connected to the slider 305. The rotation of the double-ended studs 304 drives the slider 305 to move. The lower end of the slider 305 is slidably connected to the first housing 2. The slider 305 is limited by the first housing 2 to move linearly. The upper end of the slider 305 is fixedly connected to a bracket 4. The movement of the slider 305 drives the bracket 4 to move. The outer wall of the first motor 301 is fixedly connected to the first housing 2.

[0023] See attached document Figure 1-2 And 4-5:

[0024] The fixing mechanism 7 includes a second motor 701 and a horizontal block 706. The output shaft of the second motor 701 is fixedly connected to a cam 702. The rotation of the output shaft of the second motor 701 drives the cam 702 to rotate. The outer wall of the cam 702 abuts against the straight rod 703. The movement of the cam 702 drives the straight rod 703 to move. The two outer walls of the straight rod 703 are slidably connected to the second housing 6. The straight rod 703 is limited by the second housing 6 to move linearly. A spring 704 is sleeved on the outer wall of the straight rod 703. The two ends of the spring 704 are fixedly connected to the second housing 6 and the straight rod 703, respectively. The movement of the straight rod 703 drives the spring 704 to move. A pressure plate 705 is fixedly connected to the lower end of the straight rod 703. The movement of the straight rod 703 drives the pressure plate 705 to move. The outer wall of the horizontal block 706 is fixedly connected to the bracket 4 and the vertical plate 5, respectively. The horizontal block 706 has a groove machined on it to cooperate with the pressure plate 705. The outer wall of the second motor 701 is fixedly connected to the second housing 6.

[0025] Working principle:

[0026] The tensile strength of the stretch film was tested using a stretch film strength testing device.

[0027] Preparation:

[0028] The staff placed the two stretch films of the same length to be compared onto the horizontal block 706 of the fixing mechanism 7 installed on the vertical plate 5, and attached them to the outer wall of the vertical plate 5 (e.g., Figure 1 Then start the second motor 703 (e.g.) Figure 4The output shaft of the second motor 701 rotates, causing the cam 702 to rotate, which in turn causes the straight rod 703 to move downward. The straight rod 703 is limited by the second housing 6 to move linearly. As the straight rod 703 moves downward, it causes the pressure plate 705 to move downward, compressing the spring 704. The spring 704 keeps the straight rod 703 pressed against the cam 702. The downward movement of the pressure plate 705 presses the stretching film into the groove machined on the cross block 706 (e.g., Figure 1 The lower end of the pressure plate 705 presses the stretch film against the groove of the horizontal block 706, thus fixing it more tightly and fixing one end of the stretch film. The second motor 703 is a servo motor with self-locking, which realizes stable pressing of the stretch film.

[0029] The staff started the first motor 301 (e.g.) Figure 2 The output shaft of the first motor 301 rotates clockwise, driving the first gear 302 to rotate. The rotation of the first gear 302 drives the second gear 303 to rotate synchronously (e.g., ...). Figure 3 The second gear 303 rotates synchronously, driving the two double-ended studs 304 to rotate synchronously. The rotation of the double-ended studs 304 drives the sliders 305 on both sides to move inward. The sliders 305 are limited by the first outer shell 2 and move linearly. The movement of the sliders 305 drives the brackets 4 to move inward. The movement of the brackets 4 inward drives the two fixing mechanisms 7 to move inward. The operator fixes the other end of the two stretch films to the fixing mechanisms 7 driven by the brackets 4 according to the above working method. Then, the first motor 301 is controlled to rotate in the opposite direction. The rotation of the first motor 301 in the opposite direction drives the sliders 305 on both sides to move outward, thereby driving the two brackets 4 to move outward. The frame 4 moves outward, causing the fixing mechanism 7 to move outward, which in turn pulls the stretch membrane until one set of stretch membranes breaks. Then the first motor 301 stops. The first motor 301 is a servo motor with self-locking, so it ensures that the fixing mechanism 7 stops at this position. The length of the stretch membrane that has been stretched can be observed and recorded according to the scale lines on the first housing 2. Then the first motor 301 is started again until another stretch membrane is broken. Then the first motor 301 stops to complete the strength test of the stretch membrane. Then the output shaft of the first motor 301 is controlled to rotate forward, so that the brackets 4 on both sides move in the opposite direction to the above direction. The reset process is the reverse of the above.

[0030] Then, the output shaft of the second motor 701 is controlled to rotate in the reverse direction. The reverse rotation of the output shaft of the second motor 701 drives the cam to rotate in the reverse direction, thereby moving the straight rod 703 upward. Because of the rebound of the spring 704, the straight rod 703 is always pressed against the surface of the cam 702, which in turn drives the pressure plate 705 to move upward. After the pressure plate 705 moves upward and disengages from the horizontal block 706, the second motor 701 stops. The second motor 701 is a servo motor with self-locking, which allows the pressure plate 705 to be suspended at this position. The operator can then remove the remaining stretch film to facilitate the next processing. After all is completed, all power is turned off.

[0031] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A tensile strength testing device for a stretch film, comprising a base plate (1), characterized in that: The upper end of the base plate (1) is fixedly connected to a first outer shell (2). The interior of the first outer shell (2) is provided with a moving mechanism (3). The inner wall of the first outer shell (2) is slidably connected to two supports (4). The middle of the upper end of the base plate (1) is fixedly connected to a vertical plate (5). The inner side of the outer wall of the support (4) is fixedly connected to a second outer shell (6). The outer sides of the outer wall of the vertical plate (5) are fixedly connected to the second outer shell (6). The interior of the second outer shell (6) is provided with a fixing mechanism (7).

2. The tensile strength testing device for stretch film according to claim 1, characterized in that: The moving mechanism (3) includes a first motor (301), the output shaft of the first motor (301) is fixedly connected to a first gear (302), the outer wall of the first gear (302) meshes with a second gear (303), the rotating shafts of the second gear (303) and the first gear (302) are rotatably connected to the first housing (2) through bearings, the rotating shaft of the second gear (303) is fixedly connected to a double-ended stud (304), the outer walls on both sides of the double-ended stud (304) are threadedly connected to a slider (305), and the lower end of the slider (305) is slidably connected to the first housing (2).

3. The tensile strength testing device for stretch film according to claim 2, characterized in that: The upper end of each slider (305) is fixedly connected to a bracket (4), and the outer wall of the first motor (301) is fixedly connected to the first outer shell (2).

4. The tensile strength testing device for stretch film according to claim 1, characterized in that: The fixing mechanism (7) includes a second motor (701) and a cross block (706). The output shaft of the second motor (701) is fixedly connected to a cam (702). The outer wall of the cam (702) abuts against a straight rod (703). The outer walls of both sides of the straight rod (703) are slidably connected to the second outer shell (6). A spring (704) is sleeved on the outer wall of the straight rod (703). The two ends of the spring (704) are fixedly connected to the second outer shell (6) and the straight rod (703) respectively. A pressure plate (705) is fixedly connected to the lower end of the straight rod (703).

5. The tensile strength testing device for stretch film according to claim 4, characterized in that: The outer walls of the multiple horizontal blocks (706) are fixedly connected to the bracket (4) and the vertical plate (5) respectively, and the outer wall of the second motor (701) is fixedly connected to the second outer shell (6).

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