Plastic film pendulum bob type impact testing machine

Abstract

The utility model discloses a plastic film pendulum bob type impact testing machine which is characterized in that the plastic film pendulum bob type impact testing machine comprises a base, a plurality of supporting rods are arranged on the base, the supporting rods are all connected with the same driving part, lifting parts are arranged in the supporting rods, the driving part is connected with the lifting parts, and the lifting parts are arranged on the base. The driving part comprises a pendulum bob mechanism rotationally connected to the driving part around a rotating shaft and an electromagnet located at the same horizontal position with the rotating shaft, a fixing device used for fixing a film is arranged on one side of the supporting rod and comprises a lifting device, a control device is arranged below the base, and the control device is connected with the rotating shaft. The utility model has the advantages that the lifting devices are arranged on the driving part and the fixing device, so that the highest point of the pendulum bob and the height position of the fixing part are adjustable, and the impact force of the punch is improved by utilizing the conversion of gravitational potential energy.

Description

Technical Field

[0001] The utility model relates to the field of film testing, in particular to a pendulum-type impact testing machine for plastic films. Background Art

[0002] The pendulum impact resistance of plastic film and plastic composite film is tested in accordance with the test standard GB / T8809-2015 "Test Method for Pendulum Impact Resistance of Plastic Film". The pendulum impact tester is used for testing. The pendulum impact tester includes a punch. The punch is a smooth hemisphere with a ball radius of 12.7mm and a bottom circle diameter of 25.4mm. The punch is a smooth spherical crown with a ball radius of 12.7mm and a bottom circle diameter of 19mm. Packaging material manufacturers often use this punch for type inspection and incoming inspection of packaging material impact resistance. The upper limit of the punch detection is 5.4J. When testing films and plastic composite films less than 80um, most of them can obtain a definite value with good repeatability, but when testing films and plastic composite films with a thickness greater than 80um, most of them cannot obtain a definite result: the pendulum drives the punch to fail to penetrate the sample, and the instrument outputs an "ERROR" signal. Such samples can only be embarrassingly recorded as >5.4J. The proportion of films and plastic composite films with a test thickness greater than 80um is very high. The punch specified in the standard obviously cannot meet the finalization test of the anti-pendulum impact performance of plastic films and plastic composite films required by R&D technical and quality management personnel. Utility Model Content

[0003] The purpose of the utility model is to solve the above technical problems and to provide a plastic film pendulum impact testing machine which can increase the impact force of the punch.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A plastic film pendulum impact testing machine comprises a base, wherein the base is provided with a plurality of support rods, wherein the plurality of support rods are connected to the same driving part, wherein a lifting part is provided inside the support rods, wherein the driving part is connected to the lifting part, wherein the driving part comprises a pendulum mechanism connected to the driving part and rotating around a rotating shaft, and an electromagnet at the same horizontal position as the rotating shaft, wherein a fixing device for fixing the film is provided on one side of the support rods, wherein the fixing device comprises a lifting device, and a control device is provided under the base.

[0006] A further preferred technical solution is that the support rod is provided with a sliding groove and an opening at the top, the lifting part is vertical in the sliding groove and cooperates with the sliding groove, the lifting part is slidingly provided with a sliding part that can follow the lifting part to move along the sliding groove toward / away from the base, and a driving part is installed on the sliding part. The lifting part includes: a hollow transmission sleeve, which is arranged in the sliding part, and an internal thread is formed on the inner wall of the hollow transmission sleeve; a transmission threaded rod, which is fixed on the sliding part, and an external thread meshing with the internal thread is formed on the surface of the transmission threaded rod; and a driving motor, which is drivingly connected to the transmission threaded rod and is used to drive the transmission threaded rod to rotate.

[0007] A further preferred technical solution is that the pendulum mechanism includes a counterweight, a connecting block, a connecting rod, a suction block, a pendulum arm and a punch, the connecting rod is fixedly connected to the connecting block, the counterweight is arranged on the upper part of the connecting rod and is movably connected to the connecting rod, one end of the pendulum arm passes through the connecting rod and extends to the outside thereof and is fixedly connected to the suction block, the suction block is adapted to the electromagnet, and the other end is movably connected to the punch, and the connecting block is connected to the driving part via a rotating shaft.

[0008] A further preferred technical solution is that the fixing device includes a base plate, a test hole is opened in the middle of the base plate, and the base plate is connected to a pressure plate device on all four sides through connecting columns. The pressure plate device includes a mounting platform, and a plurality of cylinders are arranged on the mounting platform. The driving ends of the cylinders are connected to telescopic rods and pass through the mounting platform. The plurality of telescopic rods are connected to the same pressure plate, and a through hole with the same size as the test hole is opened in the middle of the pressure plate.

[0009] A further preferred technical solution is that limiting plates are arranged around the pressing plate device, and the gap between the limiting plates and the bottom plate is just large enough for the plastic film to pass through.

[0010] A further preferred technical solution is that the lifting device includes two groups of sliding rods arranged opposite to each other, each group is provided with two sliding rods, each of the sliding rods is slidably connected to a base plate, and knobs are threadedly connected on both sides of the outer wall of the base plate, and one end of the two knobs passes through the base plate and fits against one side of the outer wall of the sliding rod.

[0011] A further preferred technical solution is that both the support rod and the slide rod are provided with scale lines.

[0012] A further preferred technical solution is that the lifting part is an automated electric lifting part.

[0013] A further preferred technical solution is that the control device includes a control computer and a touch screen connected to the control computer.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model arranges a lifting device on both the driving part and the fixing device, so that the highest point of the pendulum and the height position of the fixing part are adjustable, and utilizes the conversion of gravitational potential energy to increase the impact force of the punch. When the impact force is insufficient, the impact can be increased by increasing the height of the pendulum, which solves the problem that the standard pendulum punch cannot penetrate most films and plastic composite films above 80um (i.e., over-range), expands the effective range of pendulum impact strength and pendulum impact energy, and provides an additional option for defining pendulum impact strength and pendulum impact energy indicators, type inspection, incoming inspection and product inspection for films above 80um and plastic composite films. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0016] Figure 2 This is a rear view structural diagram of the utility model;

[0017] In the figure: 1. base; 2. support rod; 3. drive unit; 4. lifting unit; 5. pendulum mechanism; 6. electromagnet; 7. fixing device; 8. lifting device; 9. sliding groove; 10. sliding unit; 11. hollow transmission sleeve; 12. transmission threaded rod; 13. driving motor; 14. configuration weight; 15. connecting block; 16. connecting rod; 17. suction block; 18. pendulum arm; 19. punch; 20. bottom plate; 21. test hole; 22. installation platform; 23. cylinder; 24. pressure plate; 25. penetration hole; 26. limit plate; 27. slide bar; 28. knob; 29. ​​scale line; 30. touch screen. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Embodiment 1

[0020] like Figure 1-2 As shown, a plastic film pendulum impact tester comprises a base 1, on which a plurality of support rods 2 are arranged. In the present embodiment, two support rods are arranged, and the plurality of support rods are all connected to the same driving part 3. A lifting part 4 is arranged in the support rod 2. Specifically, a sliding groove 9 is arranged in the support rod 2, and an opening is arranged on the top. The lifting part 4 is vertically arranged in the sliding groove 9. The support rod 2 can play a certain protective role to avoid collision with the lifting part 4 or the sliding part 10 during use, so as to smoothly realize height adjustment. The lifting part 4 is slidingly provided with a sliding part 10 which can follow the lifting part to move along the sliding groove toward / away from the base, and the driving part 3 is installed on the sliding part 10.

[0021] The lifting part 4 includes: a hollow transmission sleeve 11, which is arranged in the sliding part 10, and the sliding part 10 is arranged in the sliding groove 9, and is slidably matched with the sliding part 10, and an internal thread is formed on the inner wall of the hollow transmission sleeve 11; a transmission threaded rod 12, which is fixed on the sliding part 10, and the surface of the transmission threaded rod 12 is formed with an external thread meshing with the internal thread; and a driving motor 13, which is transmission-connected with the transmission threaded rod 12 and is used to drive the transmission threaded rod 12 to rotate. The driving motor is arranged in the sliding groove 9 and is located at the bottom of the support rod. When adjusting the height, the tester starts the driving motor 13 to drive the transmission threaded rod 12 to rotate, so that the transmission threaded rod 12 drives the hollow transmission sleeve 11 to move upward or downward, so that the sliding part 10 and the driving part 3 can be synchronously driven to rise and fall, thereby adjusting the gravitational potential energy of the pendulum. The adjustment structure connected by thread is simple and easy to operate; the screw connection of the internal thread and the external thread makes the adjustment process high in stability and good in continuity, and it can stop in time when the detection height is reached; in addition, the thread adjustment method has almost no minimum adjustment unit, which improves the control accuracy.

[0022] In some other embodiments, the lifting part 4 is an automatic electric lifting part. In this embodiment, the control device is electrically connected to the lifting part 4, and the height of the lifting part 4 is controlled by the control processor to achieve automatic control, save manpower, and also improve the accuracy of adjustment.

[0023] The driving part 3 includes a pendulum mechanism 5 connected to the driving part 3 and an electromagnet 6 at the same horizontal position as the rotating shaft. Specifically, the pendulum mechanism 5 includes a counterweight 14, a connecting block 15, a connecting rod 16, a suction block 17, a pendulum arm 18 and a punch 19. The connecting rod 16 is fixedly connected to the connecting block 15. The counterweight 14 is arranged on the upper part of the connecting rod 16 and is movably connected to the connecting rod 16. One end of the pendulum 18 passes through the connecting rod 16 and extends to the outside thereof and is fixedly connected to the suction block 17. The suction block 17 is adapted to the electromagnet 6, and the other end is movably connected to the punch 19. The connecting block 15 is connected to the driving part 3 through the rotating shaft.

[0024] A fixing device 7 for fixing the film is provided on one side of the support rod 2, and the fixing device 7 includes a lifting device 8. A control device is provided under the base 1. A lifting device is installed on the fixing device 7, so that the height difference between the test breakdown point and the pendulum can be adjusted, the impact force of the punch can be increased, and the film test range can be expanded. Specifically, the fixing device 7 includes a base plate 20, a test hole 21 is opened in the middle of the base plate 20, and a pressure plate device is connected to the four sides of the base plate 20 through connecting columns. The pressure plate device includes a mounting platform, and a plurality of cylinders are arranged on the mounting platform. The driving end of the cylinder is connected to a telescopic rod and passes through the mounting platform 22. The plurality of telescopic rods are all connected to the same pressing plate 24, and a penetration hole with the same size as the test hole is opened in the middle of the pressing plate 24. The cylinder can make the machine automatically complete the compression of the film, save manpower and reduce the error of the test result. A further preferred technical solution is that the pressure plate device is provided with a limit plate 26 around it, and the gap between the limit plate 26 and the bottom plate can just pass the plastic film. The setting of the limit plate is to prevent the staff from putting their hands between the bottom plate and the pressure plate to cause crushing injuries, and also to facilitate the installation of the film.

[0025] A further preferred technical solution is that the lifting device 8 includes two groups of sliding rods 27 arranged opposite to each other, each group is provided with two sliding rods 27, each sliding rod 27 is slidably connected to the base plate 20, and knobs 28 are respectively threaded on both sides of the outer wall of the base plate 20. One end of the two knobs 28 passes through the base plate and fits with one side of the outer wall of the sliding rod 27, and the fixing device is locked by the knob 28.

[0026] A further preferred technical solution is that scale lines 29 are provided on the support rod 2 and the slide rod 27. The scale lines are provided to facilitate the staff to introduce gravitational potential energy for calculation after the test. A further preferred technical solution is that the control device includes a control computer and a touch screen 30 connected to the control computer, and the suction of the cylinder telescopic rod and the electromagnet is controlled by the touch screen 30 and the control computer, and the calculation is performed by inputting data into the control computer.

[0027] The working process of the utility model is as follows: the tester starts the device first, the electromagnet 6 is energized, and then the pendulum mechanism 5 is rotated to make the suction block 17 adsorb the electromagnet 6, and then the height of the driving part 3 and the fixing device 7 is adjusted. After the height adjustment is completed, the film is placed on the fixing device 7, and the start button is pressed. The computer controls the cylinder 23 to drive the telescopic rod to press the pressure plate 24 to press the film, the electromagnet 6 is powered off, and the pendulum mechanism 5 rotates under the action of gravity to perform an impact test on the film.

[0028] The utility model calculates the impact strength calculation formula as follows: Impact strength = Energy used / Volume = [(Sr / 100)×PD(g)×L(cm)] / [SC(cm2)*T(cm)](Pa) Impact energy = R*(Sr / 100)(J)

[0029] Wherein: SC is the spherical crown area of ​​the "pendulum punch" = [(3.14×D2-D×2×D) / (10×4)] cm2; Sr: scale reading (%), variable (effective 20% to 80%); T: sample thickness, cm; D: pendulum punch radius, cm; L: impact distance (i.e., the distance calculated by the adjusted height of the utility model), cm; PD: pendulum weight grade (1600, 3200, 6400); Wr: pendulum impact reading in g

[0030] R: Pendulum energy level (1600g: , 3200, 6400)

[0031]

[0032] The utility model arranges lifting devices on both the driving part and the fixing device, so that the highest point of the pendulum and the height position of the fixing part are adjustable, and utilizes the conversion of gravitational potential energy to increase the impact force of the punch. When the impact force is insufficient, the impact can be increased by increasing the height of the pendulum, thereby solving the problem that the standard pendulum punch cannot punch through most films above 80um and plastic composite films (i.e., over-range), and expands the effective range of pendulum impact resistance and pendulum impact energy resistance, providing an additional option for defining pendulum impact resistance and pendulum impact energy resistance indicators, type inspection, incoming inspection and product inspection for films above 80um and plastic composite films.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic film pendulum impact testing machine, characterized in that: It includes a base, a plurality of support rods are arranged on the base, the plurality of support rods are connected to the same driving part, a lifting part is arranged inside the support rods, the driving part is connected to the lifting part, the driving part includes a pendulum mechanism connected to the driving part and rotating around a rotating shaft, and an electromagnet is at the same horizontal position as the rotating shaft, a fixing device for fixing a film is arranged on one side of the support rod, the fixing device includes a lifting device, and a control device is arranged under the base.

2. A plastic film pendulum impact testing machine as claimed in claim 1, characterized in that: The support rod is provided with a sliding groove inside and an opening on the top, the lifting part is vertical in the sliding groove and cooperates with the sliding groove, the lifting part is slidingly provided with a sliding part that can follow the lifting part to move along the sliding groove toward / away from the base, and a driving part is installed on the sliding part. The lifting part includes: a hollow transmission sleeve, which is arranged in the sliding part, and an internal thread is formed on the inner wall of the hollow transmission sleeve; a transmission thread rod, which is fixed on the sliding part, and an external thread meshing with the internal thread is formed on the surface of the transmission thread rod; and a driving motor, which is drivingly connected to the transmission thread rod and is used to drive the transmission thread rod to rotate.

3. A plastic film pendulum impact testing machine as claimed in claim 1, characterized in that: The pendulum mechanism includes a counterweight, a connecting block, a connecting rod, a suction block, a pendulum arm and a punch. The connecting rod is fixedly connected to the connecting block, the counterweight is arranged on the upper part of the connecting rod and is movably connected to the connecting rod, one end of the pendulum arm passes through the connecting rod and extends to the outside thereof and is fixedly connected to the suction block, the suction block is adapted to the electromagnet, and the other end is movably connected to the punch, and the connecting block is connected to the driving part through a rotating shaft.

4. A plastic film pendulum impact testing machine as claimed in claim 1, characterized in that: The fixing device includes a base plate, a test hole is opened in the middle of the base plate, and a pressure plate device is connected to the four sides of the base plate through connecting columns. The pressure plate device includes a mounting platform, and a plurality of cylinders are arranged on the mounting platform. The driving ends of the cylinders are connected to telescopic rods and pass through the mounting platform. The plurality of telescopic rods are connected to the same pressure plate, and a penetration hole with the same size as the test hole is opened in the middle of the pressure plate.

5. A plastic film pendulum impact testing machine as claimed in claim 4, characterized in that: Limiting plates are arranged around the pressing plate device, and the gap between the limiting plates and the bottom plate is just enough for the plastic film to pass through.

6. A plastic film pendulum impact testing machine as claimed in claim 1, characterized in that: The lifting device includes two groups of sliding rods arranged opposite to each other, each group is provided with two sliding rods, each of the sliding rods is slidably connected to a base plate, and knobs are threadedly connected on both sides of the outer wall of the base plate. One end of the two knobs passes through the base plate and fits against one side of the outer wall of the sliding rod.

7. A plastic film pendulum impact testing machine as claimed in claim 6, characterized in that: The support rod and the slide rod are both provided with scale lines.

8. A plastic film pendulum impact testing machine as claimed in claim 1, characterized in that: The lifting part is an automated electric lifting part.

9. A plastic film pendulum impact testing machine as claimed in claim 1, characterized in that: The control device comprises a control computer and a touch screen connected to the control computer.

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