A friction and wear testing machine for plastic packaging bags

Abstract

The present invention discloses a friction and wear testing machine for plastic packaging bags, which relates to the technical field of friction and wear testing machines and includes a frame and an operating table. Moving grooves are symmetrically formed on the frame. Fixed plates are symmetrically and fixedly connected to the upper surface of the operating table. Threaded sleeves are fixedly connected to the fixed plates. Threaded handles are threadedly connected to the threaded sleeves. The bottom of the threaded handle is fixedly connected to a lower pressing plate. Limiting strips are symmetrically and fixedly connected to the surface of the lower pressing plate. A polishing device is arranged above the operating table; through the rotation of the chassis, the pushing column is driven to perform a circular motion, so that the pushing column pushes the dividing disc, and with the limiting effect of the limiting disc on the dividing disc, the polishing head fixed to the bottom of the dividing disc can be rotated to different positions on the surface of the plastic packaging bag, and friction and wear tests can be carried out on different positions on the surface of the plastic packaging bag, so as to evaluate the uniformity of the plastic packaging bag material and test whether the plastic packaging bag has the same anti-friction and wear performance at different positions.

Description

Technical Field

[0001] The present invention relates to the technical field of friction and wear testing machines, and more specifically, to a friction and wear testing machine for plastic packaging bags. Background Art

[0002] A friction and wear testing machine for plastic packaging bags is a device that specifically tests the wear resistance of plastic packaging bags by rubbing a grinding head against the plastic packaging bag. It is used to test the wear resistance and lifespan of plastic packaging bags. The grinding head of the existing friction and wear testing machine for plastic packaging bags is usually fixed in the equipment body and can only perform friction and wear tests on the central position of the plastic packaging bag. This testing method is too single and cannot test the actual usage situation of the packaging bag in daily life. Moreover, if it is necessary to test different positions on the surface of the plastic packaging bag, it is necessary to manually adjust the different positions of the plastic packaging bag.

[0003] To solve the above problems, the inventor has proposed a friction and wear testing machine for plastic packaging bags. Summary of the Invention

[0004] To solve the above technical problems, a friction and wear testing machine for plastic packaging bags is provided. This technical solution solves the problem of testing different positions on the surface of the plastic packaging bag proposed in the above background art.

[0005] To achieve the above objectives, the present invention can adopt the following technical solutions:

[0006] The present invention provides a friction and wear testing machine for plastic packaging bags, including a frame and an operating table. The frame is symmetrically provided with moving grooves, and there are no less than two moving grooves. Above the operating table, there is a grinding device, a rotating assembly and a pressing assembly are provided above the operating table, and a cooling assembly is provided outside the operating table;

[0007] The rotating assembly includes a support frame fixedly connected to the upper surface of the frame. The upper surface of the support frame is fixedly connected with a servo motor. The output end of the servo motor is fixedly connected with a transmission column. The outer surface of the transmission column is circumferentially and equidistantly provided with limiting grooves, and there are no less than six limiting grooves. The outer surface of the transmission column is slidably connected with a sleeve. The upper surface of the sleeve is circumferentially and equidistantly fixedly connected with limiting columns, and there are six limiting columns. The bottom of the sleeve is fixedly connected with a limiting disk. One side of the limiting disk away from the sleeve is fixedly connected with a chassis. The eccentric position of the chassis close to the limiting disk is fixedly connected with a pushing column. One side of the chassis away from the limiting disk is rotatably connected with a connecting frame. Inside the connecting frame, there is a dividing disk rotatably connected. The surface of the dividing disk is circumferentially and equidistantly provided with strip-shaped inner grooves, and there are no less than four strip-shaped inner grooves. Electrode plates are arranged in the strip-shaped inner grooves.

[0008] Preferably, the transmission column is rotatably connected to the support frame, the aperture of the limiting groove is adapted to the diameter of the limiting column, the limiting groove is slidably connected to the limiting column, and the sleeve is rotatably connected to the frame.

[0009] Preferably, the shape of the limiting disc is "crescent-shaped", the diameter of the pushing column is adapted to the diameter of the strip-shaped inner groove, electric contacts are arranged on the outer surface of the pushing column, the connecting frame is slidably connected to the moving groove, arc-shaped inner grooves are equidistantly arranged on the outer wall of the dividing disc, and the bottom of the dividing disc is fixedly connected to the grinding device.

[0010] Preferably, the rotating assembly further includes a circular ring groove opened on the sleeve, there are at least two circular ring grooves, a push-pull rod is rotatably connected in the frame, a sliding plate is rotatably connected to one side of the push-pull rod close to the sleeve, there are at least two sliding plates, and the sliding plates are slidably connected to the circular ring groove.

[0011] Preferably, the pressing-down assembly includes a bevel gear one fixedly connected to the outer surface of the transmission column, a bevel gear two is meshed and connected to the outside of the bevel gear one, a synchronous wheel one is fixedly connected to one side of the bevel gear two away from the transmission column, a synchronous wheel two is rotatably connected in the frame, a rotating rod is fixedly connected to one side of the synchronous wheel two close to the bevel gear two, a fixing column one is fixedly connected to one side of the rotating rod close to the synchronous wheel two, a tension spring is movably connected to the outer surface of the fixing column one, a fixing column two is movably connected to one side of the tension spring away from the fixing column one, a connecting seat is fixedly connected in the frame, an inner ring groove is opened on the inner ring surface of the connecting seat, a rotating disc is rotatably connected in the connecting seat, inclined grooves are annularly and equidistantly opened in the connecting seat, there are at least four inclined grooves, a trapezoidal rod is slidably connected in the inclined grooves, and a spring is sleeved on the outside of the trapezoidal rod.

[0012] Preferably, the number of teeth of the bevel gear one is one-fourth of the number of teeth of the bevel gear two, the bevel gear two is rotatably connected to the support frame, the synchronous wheel one is rotatably connected to the support frame, the synchronous wheel one is in transmission connection with the synchronous wheel two through a synchronous belt, the length of the rotating rod is greater than the radius of the rotating disc, the fixing column two is fixedly connected to the rotating disc, a notch is arranged on the outer wall of the rotating disc, and the notch is adapted to the shape of the trapezoidal rod, and the springs are respectively fixedly connected to the inclined grooves and the trapezoidal rod.

[0013] Preferably, the pressing-down assembly further includes a connecting disc fixedly connected to the rotating disc, a rotating rod is rotatably connected to an eccentric position on one side of the connecting disc away from the connecting seat, and the rotating rod is rotatably connected to the push-pull rod.

[0014] Preferably, the cooling component includes a third synchronous pulley fixedly connected to the outer surface of the transmission column. A gear speed increasing device is embedded in the upper surface of the frame. A fourth synchronous pulley is fixedly connected to the input shaft of the gear speed increasing device. A disc is fixedly connected to the output shaft of the gear speed increasing device. A second connecting rod is rotatably connected to the eccentric position of the disc. One side of the second connecting rod away from the disc is rotatably connected to a piston rod. A piston cylinder is fixedly connected to the upper surface of the frame. A one-way air outlet pipe is communicated with the inside of the piston cylinder.

[0015] Preferably, the third synchronous pulley is in transmission connection with the fourth synchronous pulley through a synchronous belt. The piston rod is slidably connected to the piston cylinder. An air extraction hole is formed in one side of the piston cylinder close to the second connecting rod. The one-way air outlet pipe is fixedly connected to the support frame and the frame. One end of the one-way air outlet pipe away from the piston cylinder faces the operation table.

[0016] Preferably, fixing plates are symmetrically and fixedly connected to the upper surface of the operation table. There are at least two fixing plates. A threaded sleeve is fixedly connected to the fixing plate. A threaded handle is threadedly connected to the threaded sleeve. A lower pressing plate is fixedly connected to the bottom of the threaded handle. Limiting strips are symmetrically and fixedly connected to the surface of the lower pressing plate. There are at least four limiting strips. The limiting strips pass through the fixing plate and are slidably connected to the fixing plate.

[0017] As described above, the features and advantages of the present invention are:

[0018] Through the rotation of the chassis, the pushing column is driven to perform a circular motion, so that the pushing column pushes the dividing disc, and with the limiting effect of the limiting disc on the dividing disc, the grinding head fixed to the bottom of the dividing disc can be rotated to different positions on the surface of the plastic packaging bag. In this way, friction wear tests can be carried out on different positions on the surface of the plastic packaging bag, so as to evaluate the uniformity of the plastic packaging bag material and test whether the whole plastic packaging bag has the same anti-friction and wear resistance at different positions;

[0019] During the process of the chassis rotating one circle, the electric contact on the surface of the pushing column contacts the electrode plate in the strip-shaped inner groove, so that the grinding head stops rotating and moves to the next position where the plastic packaging bag needs to be rubbed along an arc trajectory. Thus, not only is the plastic packaging bag subjected to rotational friction at different points, but also it is subjected to moving friction along an arc trajectory during the movement of each point. In this way, testing multiple positions is equivalent to increasing the number of test data samples, so that different test results can be obtained on the same plastic packaging bag;

[0020] After the dividing disk completes one rotation, it drives the rotating disk to rotate rapidly by ninety degrees, thereby pushing and pulling, causing the sleeve to perform vertical lifting while rotating, and further enabling the grinding head to apply different downward pressures to different positions of the plastic packaging bag, so as to simulate the test results of different positions of the plastic packaging bag being subjected to different degrees of friction and wear during actual use;

[0021] While the transmission column rotates, it drives the fourth synchronous wheel to rotate. Then, by utilizing the speed increasing effect of the gear speed increasing device, the rotation speed of the disk is much greater than that of the fourth synchronous wheel. The rotation of the disk causes the second connecting rod to repeatedly push and pull the piston rod, continuously sucking air into the piston cylinder, and blowing air through the one-way air outlet pipe to cool the plastic packaging bag fixed on the operating table, preventing the temperature of the contact surface from being too high due to the long-term friction between the plastic packaging bag and the grinding head, thereby reducing the accuracy of the friction and wear test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Front three-dimensional schematic diagram of the overall structure shown in the present invention;

[0023] Figure 2 Sectioned three-dimensional schematic diagram of the overall structure shown in the present invention;

[0024] Figure 3 Sectioned three-dimensional schematic diagram of the inside of the support frame shown in the present invention;

[0025] Figure 4 Shown in the present invention Figure 3 Local enlarged three-dimensional schematic diagram of A in;

[0026] Figure 5 Three-dimensional schematic diagram of the connection relationship between the transmission column and the sleeve shown in the present invention;

[0027] Figure 6 Sectioned three-dimensional schematic diagram of the sleeve shown in the present invention;

[0028] Figure 7 Sectioned three-dimensional schematic diagram of the inside of the connection frame shown in the present invention;

[0029] Figure 8 Three-dimensional schematic diagram of the related components of the push column shown in the present invention;

[0030] Figure 9 Three-dimensional schematic diagram of the connection part between the first bevel gear and the second bevel gear shown in the present invention;

[0031] Figure 10 Three-dimensional schematic diagram of the connection part between the first synchronous wheel and the second synchronous wheel shown in the present invention;

[0032] Figure 11 Three-dimensional schematic diagram of the related components of the connection seat shown in the present invention;

[0033] Figure 12 Schematic three-dimensional view of the inner ring groove related components shown in the present invention;

[0034] Figure 13 Partial exploded three-dimensional view of the pressing-down component shown in the present invention;

[0035] Figure 14 Schematic three-dimensional view of the cooling component shown in the present invention;

[0036] Figure 15 Schematic three-dimensional view of the one-way air outlet pipe related components shown in the present invention.

[0037] Among them, the reference numerals in the present invention are:

[0038] 1. Frame; 11. Moving groove; 2. Operating table; 31. Fixed plate; 32. Threaded sleeve; 33. Threaded handle; 34. Lower pressing plate; 35. Limiting strip; 4. Grinding equipment;

[0039] Rotating assembly: 51. Support frame; 52. Servo motor; 53. Transmission column; 54. Limiting groove; 55. Sleeve; 56. Limiting column; 57. Limiting disc; 58. Chassis; 59. Pushing column; 510. Connecting frame; 511. Dividing disc; 512. Strip-shaped inner groove; 513. Electrode plate; 514. Circular ring groove; 515. Push-pull rod; 516. Slide plate;

[0040] Pressing-down assembly: 61. First bevel gear; 62. Second bevel gear; 63. First synchronous pulley; 64. Second synchronous pulley; 65. Rotating rod; 66. First fixed column; 67. Tension spring; 68. Second fixed column; 69. Connecting seat; 6901. Inner ring groove; 610. Rotating disc; 611. Inclined groove; 612. Trapezoidal rod; 613. Spring; 614. Connecting disc; 615. Rotating rod;

[0041] Cooling assembly: 71. Third synchronous pulley; 72. Gear speed increasing device; 73. Fourth synchronous pulley; 74. Disc; 75. Second connecting rod; 76. Piston rod; 77. Piston cylinder; 78. One-way air outlet pipe. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 belong to the scope of protection of the present invention.

[0043] Refer to Figures 1 to 13As shown, this is an embodiment provided by the present invention, and a friction and wear testing machine for plastic packaging bags provided will be elaborated in detail below:

[0044] Embodiment 1: A friction and wear testing machine for plastic packaging bags, as Figure 1 and Figure 2 shown, includes a frame 1 and an operating table 2. Symmetrically arranged moving grooves 11 are formed on the frame 1, and there are no less than two moving grooves 11. Symmetrically fixed on the upper surface of the operating table 2 are fixing plates 31, and the two fixing plates 31 form a complete square after combination. There are no less than two fixing plates 31. Threaded sleeves 32 are fixedly connected to the fixing plates 31. Threaded handles 33 are threadedly connected to the threaded sleeves 32. The bottom of the threaded handle 33 is fixedly connected to a lower pressing plate 34, and the lower pressing plate 34 is adapted to the fixing plate 31. Symmetrically fixed on the surface of the lower pressing plate 34 are limiting strips 35. There are no less than four limiting strips 35, and the limiting strips 35 pass through the fixing plate 31. A grinding device 4 is arranged above the operating table 2. The limiting strips 35 are slidably connected to the fixing plate 31. A rotating component and a pressing-down component are arranged above the operating table 2. A cooling component is arranged outside the operating table 2;

[0045] As Figures 2 to 7 shown, the rotating component includes a support frame 51 fixedly connected to the upper surface of the frame 1. A servo motor 52 is fixedly connected to the upper surface of the support frame 51. The output end of the servo motor 52 is fixedly connected to a transmission column 53. Equally spaced limiting grooves 54 are formed around the outer surface of the transmission column 53. There are no less than six limiting grooves 54. A sleeve 55 is slidably connected to the outer surface of the transmission column 53, and the sleeve 55 passes through the top of the frame 1. The sleeve 55 is rotatably connected to the frame 1. Equally spaced limiting columns 56 are fixedly connected to the upper surface of the sleeve 55. There are no less than six limiting columns 56. The limiting columns 56 are placed inside the limiting grooves 54, and the limiting grooves 54 are slidably connected to the limiting columns 56. A limiting disc 57 is fixedly connected to the bottom of the sleeve 55. A chassis 58 is fixedly connected to the side of the limiting disc 57 away from the sleeve 55. A push column 59 is fixedly connected to an eccentric position on the side of the chassis 58 close to the limiting disc 57. A connecting frame 510 is rotatably connected to the side of the chassis 58 away from the limiting disc 57. A dividing disc 511 is rotatably connected inside the connecting frame 510. Equally spaced strip-shaped inner grooves 512 are formed on the surface of the dividing disc 511. There are no less than four strip-shaped inner grooves 512. Electrode plates 513 are arranged inside the strip-shaped inner grooves 512;

[0046] Furthermore, as Figures 3 to 5 shown, the transmission column 53 is rotatably connected to the support frame 51, and the aperture of the limiting groove 54 is adapted to the diameter of the limiting column 56;

[0047] Furthermore, as Figure 7As shown, the shape of the limit disk 57 is "crescent-shaped". The diameter of the push column 59 is adapted to the diameter of the strip-shaped inner groove 512. Electric contacts are arranged on the outer surface of the push column 59, and the electric contacts and the electrode plate 513 control the start and stop of the grinding head of the grinding device 4 through a controller. The connecting frame 510 is slidably connected to the moving groove 11. Arc-shaped inner grooves are equidistantly arranged on the outer wall of the dividing disk 511, and the arc-shaped inner grooves are adapted to the limit disk 57. The limit disk 57 is alternately in contact with the equidistantly arranged arc-shaped inner grooves. The bottom of the dividing disk 511 is fixedly connected to the grinding device 4;

[0048] Further, as Figure 3 and Figure 4 shown, the rotating assembly further includes a circular ring groove 514 opened on the sleeve 55. There are no less than two circular ring grooves 514. A push-pull rod 515 is rotatably connected inside the frame 1. The shape of the push-pull rod 515 is "Y"-shaped. Symmetrically rotatably connected to one side of the push-pull rod 515 close to the sleeve 55 are sliding plates 516. There are no less than two sliding plates 516. The sliding plates 516 are slidably connected to the circular ring groove 514;

[0049] During operation: First, place the plastic packaging bag on the upper surface of the operation table 2 and lay it flat and unfolded, so that the four sides of the plastic packaging bag are located below the lower pressing plate 34. Then, rotate the threaded handle 33 to drive the lower pressing plate 34, so that the lower pressing plate 34 moves vertically downward under the limitation of the threaded sleeve 32 to press down the plastic packaging bag. Next, install the grinding head on the grinding device 4, and then prepare for the friction and wear test. After the plastic packaging bag is fixed, start the grinding device 4 and the servo motor 52 respectively, and set the output shaft of the servo motor 52 to rotate slowly, so that the output shaft of the servo motor 52 drives the transmission column 53 to rotate. Since the limiting column 56 is located inside the limiting groove 54, under the limiting action of the limiting column 56, the sleeve 55 rotates together with the transmission column 53 in the counterclockwise direction. When the sleeve 55 rotates counterclockwise for one circle, the chassis 58 rotates together with the sleeve 55 in the counterclockwise direction. During the process of the chassis 58 rotating counterclockwise for one circle, the pushing column 59 moves in a circular motion at an eccentric position of the chassis 58. When the pushing column 59 has not rotated into the inner bar-shaped groove 512, the outer wall of the limiting disk 57 fits with the arc-shaped inner groove on the outer wall of the dividing disk 511, so that the dividing disk 511 cannot rotate freely under the limiting action of the outer wall of the limiting disk 57. During this process, the grinding head installed on the grinding device 4 rotates and rubs the plastic packaging bag. At this time, the position of the plastic packaging bag being ground is the first point. When the pushing column 59 enters the inner bar-shaped groove 512 opened on the dividing disk 511, the arc-shaped inner groove of the dividing disk 511 disengages from the contact with the outer arc surface of the limiting disk 57. As the chassis 58 rotates, the pushing column 59 gradually enters the inner bar-shaped groove 512 and gradually squeezes the inner bar-shaped groove 512 to make the dividing disk 511 rotate. During the process of the pushing column 59 pushing the dividing disk 511 to rotate through the inner bar-shaped groove 512, the positions of the four inner bar-shaped grooves 512 on the dividing disk 511 are replaced with each other. During the replacement process, the chassis 58 continues to rotate, so that the pushing column 59 gradually slides outwards from the inner bar-shaped groove 512. At this time, the chassis 58 has rotated one circle and the dividing disk 511 has rotated 90 degrees. Thus, the rotation of the dividing disk 511 synchronously drives the grinding device 4 to rotate, so that the position where the grinding head is located is the second point of the plastic packaging bag. During the process of the pushing column 59 entering and leaving the inner bar-shaped groove 512, the electrical contacts on the outer surface of the pushing column 59 contact the electrode plate 513 in the inner bar-shaped groove 512, so that the grinding device 4 stops rotating and grinding;

[0050] Since the chassis 58 rotates four times, the strip-shaped inner grooves 512 on the dividing disk 511 replace their positions with each other four times, and the dividing disk 511 also rotates one circle, then the friction and wear test of the plastic packaging bag can be completed. Therefore, after the pushing column 59 drives the dividing disk 511 to rotate 90 degrees for the second time, the position where the grinding head is located is the third point position of the plastic packaging bag. And so on, after the pushing column 59 drives the dividing disk 511 to rotate 90 degrees for the third and fourth times, the positions where the grinding head is located are the fourth point position and the first point position of the plastic packaging bag. In this way, the wear test of different positions of the plastic packaging bag can be completed by the rotation of the grinding head.

[0051] Embodiment 2: Further, as Figures 8 to 11 shown, the pressing component includes a first bevel gear 61 fixedly connected to the outer surface of the transmission column 53. A second bevel gear 62 is meshed and connected to the outside of the first bevel gear 61. A first synchronous wheel 63 is fixedly connected to the side of the second bevel gear 62 away from the transmission column 53. The first synchronous wheel 63 is rotatably connected to the support frame 51. A second synchronous wheel 64 is rotatably connected inside the support frame 51. A rotating rod 65 is fixedly connected to the side of the second synchronous wheel 64 close to the second bevel gear 62. A first fixing column 66 is fixedly connected to the side of the rotating rod 65 close to the second synchronous wheel 64. A tension spring 67 is movably connected to the outer surface of the first fixing column 66, and it is in a stretched state. A second fixing column 68 is movably connected to the side of the tension spring 67 away from the first fixing column 66. The second fixing column 68 is fixedly connected to the rotating disk 610. A connecting seat 69 is fixedly connected inside the frame 1. An inner ring groove 6901 is formed on the inner ring surface of the connecting seat 69. The rotating disk 610 is rotatably connected inside the connecting seat 69. A plurality of inclined slots 611 are annularly and equidistantly formed inside the connecting seat 69. There are no less than four inclined slots 611. A trapezoidal rod 612 is slidably connected inside the inclined slot 611, and it passes through the connecting seat 69. A spring 613 is sleeved outside the trapezoidal rod 612;

[0052] Further, as Figure 8 and Figure 9 shown, the number of teeth of the first bevel gear 61 is one-fourth of the number of teeth of the second bevel gear 62. When the first bevel gear 61 rotates one circle, the second bevel gear 62 rotates 90 degrees. The second bevel gear 62 is rotatably connected to the support frame 51. The first synchronous wheel 63 is in transmission connection with the second synchronous wheel 64 through a synchronous belt. The length of the rotating rod 65 is greater than the radius of the rotating disk 610, and it is used to move the outer wall of the trapezoidal rod 612 away from the rotating disk 610. Notches adapted to the trapezoidal rod 612 are provided on the outer wall of the rotating disk 610, and they are used to limit the rotation of the rotating disk 610. The spring 613 is fixedly connected to the inclined slot 611 and the trapezoidal rod 612 respectively. The four springs 613 are in a compressed state;

[0053] Further, as Figure 4 and Figure 8As shown, the pressing assembly further includes a connecting disk 614 fixedly connected to the rotating disk 610, and the connecting disk 614 is rotatably connected to a rotating rod 615 at an eccentric position away from the connecting seat 69, and the rotating rod 615 is rotatably connected to the middle position of the push-pull rod 515;

[0054] During operation: In combination with Example 1, when the transmission column 53 rotates one circle counterclockwise, the bevel gear 1 61 on the transmission column 53 causes the bevel gear 2 62 to rotate ninety degrees toward the side close to the connecting seat 69. The rotation of the bevel gear 2 62 drives the synchronous wheel 1 63 and the synchronous wheel 2 64 to rotate together with the bevel gear 2 62, thereby causing the rotating rod 65 to rotate ninety degrees along the inner ring groove 6901 toward the direction away from the side of the fixed column 2 68. In the process of the rotating rod 65 rotating ninety degrees along the inner ring groove 6901 toward the direction away from the side of the fixed column 2 68, the tension spring 67 is stretched. When one end of the rotating rod 65 close to the fixed column 1 66 contacts the trapezoidal rod 612 as the rotating rod 65 rotates, the one end of the rotating rod 65 close to the fixed column 1 66 pushes the trapezoidal rod 612, causing the trapezoidal rod 612 to move toward the side away from the center of the rotating disk 610, and the spring 613 is further compressed. Since the length of the rotating rod 65 is greater than the rotating disk 610, Therefore, when the trapezoidal rod 612 is pushed out of the notch of the rotating disk 610 by the rotating rod 65, the trapezoidal rod 612 is a distance away from the outer surface of the rotating disk 610, so that the rotating disk 610 loses the limit of the trapezoidal rod 612 and can rotate freely. Therefore, the rotating disk 610 uses the elastic force generated by the tension spring 67 being stretched, and the tension spring 67 pulls the rotating disk 610 to rotate. When the notch of the rotating disk 610 moves to the next trapezoidal rod as the rotating disk 610 rotates, When the rod 612 is in the position, the spring 613 sleeved on the outer side of the next trapezoidal rod 612 pushes the trapezoidal rod 612 into the notch of the rotating disk 610. At this time, the rotating disk 610 rotates 90 degrees. In this way, it is known that when the transmission column 53 rotates one circle counterclockwise, the rotating disk 610 quickly rotates 90 degrees. In combination with the first embodiment, it can be known that the transmission column 53 needs to rotate four circles counterclockwise to complete a plastic packaging bag friction and wear test, that is, the rotating disk 610 rotates four times with a period of 90 degrees;

[0055] The rotation of the rotating disk 610 causes the connecting disk 614 to rotate together with the rotating disk 610. When the connecting disk 614 rotates 90 degrees for the first time, the rotating rod 615 on the connecting disk 614 pushes the push-pull rod 515, so that the push-pull rod 515 rotates in a direction away from the connecting disk 614 with the rotating connection with the frame 1 as the axis. When the push-pull rod 515 rotates in a direction away from the connecting disk 614, the push-pull rod 515 presses down the slide plate 516, so that the sleeve 55 rotates with the transmission column 53, and the slide plate 516 drives the sleeve 55 to move vertically downward, so that the connecting frame 510 moves downward along the moving groove 11.

[0056] Combined with Embodiment 1, when the connecting disk 614 rotates by 90 degrees, the dividing disk 511 also rotates by 90 degrees, which means that during the process of the pushing column 59 rotating counterclockwise one circle with the sleeve 55 as the axis, when the pushing column 59 has not rotated into the inner bar-shaped groove 512, the grinding head rotates and rubs the first point of the plastic packaging bag with the initial downward pressure. When the pushing column 59 enters the inner bar-shaped groove 512 and the electrical contact on the outer surface of the pushing column 59 contacts the electrode plate 513, the grinding head stops rotating and moves and rubs the plastic packaging bag along an arc trajectory with the initial downward pressure until the pushing column 59 leaves the inner bar-shaped groove 512. At this time, the pushing column 59 has rotated one circle, and the grinding head has moved to the second point of the plastic packaging bag, and the grinding head rotates again, applying a greater downward pressure to the surface of the plastic packaging bag and rotating and rubbing. When the connecting disk 614 rotates 90 degrees for the second time, repeat the above steps. The grinding head moves from the second point of the plastic packaging bag to the third point, and through the rotation amplitude of the rotating disk 610, applies a greater downward pressure on the surface for rotating and rubbing, and performs moving and rubbing after rotating and rubbing;

[0057] Reference Figure 8 As shown, when the connecting disk 614 rotates 90 degrees for the third time, the rotating rod 615 on the connecting disk 614 pulls the push rod 515, so that the push rod 515 rotates around the rotation connection with the frame 1 in the direction close to the connecting disk 614. When the push rod 515 rotates in the direction close to the connecting disk 614, the push rod 515 pulls the sliding plate 516, so that while the sleeve 55 rotates with the transmission column 53, the sliding plate 516 drives the sleeve 55 to move vertically upward, so that the connecting frame 510 moves upward along the moving groove 11. Combined with Embodiment 1, during the process of the connecting disk 614 rotating 90 degrees for the third time, after the grinding head moves from the third point to the fourth point, the downward pressure applied by the grinding head to the plastic packaging bag is equal to the downward pressure when the grinding head is at the second point, and repeat the steps of rotating and grinding and moving and grinding;

[0058] When the connecting disk 614 rotates 90 degrees for the fourth time, the connecting disk 614 rotates back to the initial position, and the grinding head moves from the fourth point of the plastic packaging bag to the first point. At this time, the grinding device 4 is turned off and the grinding head stops rotating. In this way, different downward pressures can be applied to different positions of the plastic packaging bag, so as to explore the wear conditions caused by different downward pressures on the same plastic packaging bag.

[0059] Embodiment 3: Further, as Figure 12 and Figure 13As shown in the figure, the cooling component includes a third synchronous pulley 71 fixedly connected to the outer surface of the transmission column 53. A gear speed increasing device 72 is embedded in the upper surface of the frame 1. A fourth synchronous pulley 73 is fixedly connected to the input shaft of the gear speed increasing device 72. A disc 74 is fixedly connected to the output shaft of the gear speed increasing device 72. Through the action of the internal gears of the gear speed increasing device 72, the rotational speed of the output shaft of the gear speed increasing device 72 can be made greater than the rotational speed of the input shaft of the gear speed increasing device 72. A second connecting rod 75 is rotatably connected to the eccentric position of the disc 74. One side of the second connecting rod 75 away from the disc 74 is rotatably connected to a piston rod 76. A piston cylinder 77 is fixedly connected to the upper surface of the frame 1. The piston rod 76 is placed inside the piston cylinder 77. The inside of the piston cylinder 77 is communicated with a one-way air outlet pipe 78;

[0060] Further, as Figure 12 and Figure 13 shown in the figure, the third synchronous pulley 71 is in transmission connection with the fourth synchronous pulley 73 through a synchronous belt. The piston rod 76 is in sliding connection with the piston cylinder 77. An air extraction hole is opened on one side of the piston cylinder 77 close to the second connecting rod 75. Air enters the inside of the piston cylinder 77 through the air extraction hole. The one-way air outlet pipe 78 is fixedly connected to the support frame 51 and the frame 1. One end of the one-way air outlet pipe 78 away from the piston cylinder 77 faces the operating table 2;

[0061] During operation: When the output shaft of the servo motor 52 drives the transmission column 53 to rotate, the third synchronous pulley 71 on the transmission column 53 makes the fourth synchronous pulley 73 on the input shaft of the gear speed increasing device 72 rotate together through the synchronous belt. Through the speed increasing effect of the gear speed increasing device 72, when the disc 74 on the output shaft of the gear speed increasing device 72 rotates along with the fourth synchronous pulley 73, the rotational speed is much greater than that of the fourth synchronous pulley 73. During the rotation of the disc 74, the second connecting rod 75 at the eccentric position on the surface of the disc 74 continuously pushes and pulls the piston rod 76, causing the second connecting rod 75 to drive the piston rod 76 to continuously move horizontally inside the piston cylinder 77. When the piston rod 76 moves horizontally towards the side close to the disc 74, the one-way valve in the one-way air outlet pipe 78 is in a closed state, and air is sucked from the air extraction hole opened on one side of the piston cylinder 77 close to the second connecting rod 75 into the inside of the piston cylinder 77. When the piston rod 76 moves horizontally towards the side away from the disc 74, the one-way valve in the one-way air outlet pipe 78 is in an open state, and the piston rod 76 pushes the gas inside the piston cylinder 77 into the inside of the one-way air outlet pipe 78. Since the opening at one end of the one-way air outlet pipe 78 away from the piston cylinder 77 faces the operating table 2, the gas inside the one-way air outlet pipe 78 will blow towards the surface of the plastic packaging bag fixed on the surface of the operating table 2, cooling the plastic packaging bag during the friction and wear test, and preventing the contact surface temperature from being too high after the grinding head and the plastic packaging bag rotate in contact for a long time, which affects the data accuracy of the friction and wear test.

[0062] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plastic packaging bag friction and wear testing machine, characterized in that: The invention comprises a frame (1) and an operating table (2), wherein the frame (1) is symmetrically provided with movable grooves (11), and the movable grooves (11) are provided with no less than two. A grinding device (4) is provided above the operating table (2), a rotating assembly and a pressing assembly are provided above the operating table (2), and a cooling assembly is provided on the outer side of the operating table (2); The rotating assembly comprises a support frame (51) fixedly connected to the upper surface of the frame (1); a servo motor (52) is fixedly connected to the upper surface of the support frame (51); a transmission column (53) is fixedly connected to the output end of the servo motor (52); a limiting groove (54) is equidistantly arranged around the outer surface of the transmission column (53); and no less than six limiting grooves (54) are provided. A sleeve (55) is slidably connected to the outer surface of the transmission column (53); a limiting column (56) is equidistantly fixedly connected to the upper surface of the sleeve (55); six limiting columns (56) are provided; and the bottom of the sleeve (55) is fixedly connected to the A limit plate (57) is connected, a side of the limit plate (57) away from the sleeve (55) is fixedly connected to a chassis (58), an eccentric position of the chassis (58) close to the limit plate (57) is fixedly connected to a push column (59), a side of the chassis (58) away from the limit plate (57) is rotatably connected to a connection frame (510), a partition plate (511) is rotatably connected inside the connection frame (510), a surface of the partition plate (511) is provided with strip-shaped inner grooves (512) at equal intervals in an annular manner, no less than four strip-shaped inner grooves (512) are provided, and an electrode sheet (513) is provided inside the strip-shaped inner grooves (512); The limiting plate (57) is in a "crescent" shape, the pushing column (59) is adapted to the diameter of the strip-shaped inner groove (512), an electrical contact is provided on the outer surface of the pushing column (59), the connecting frame (510) is slidably connected to the movable groove (11), the outer wall of the dividing plate (511) is equidistantly provided with arc-shaped inner grooves, and the bottom of the dividing plate (511) is fixedly connected to the grinding device (4); The pressing assembly comprises a bevel gear 1 (61) fixedly connected to the outer surface of the transmission column (53); the outer side of the bevel gear 1 (61) is meshingly connected to a bevel gear 2 (62); the side of the bevel gear 2 (62) away from the transmission column (53) is fixedly connected to a synchronous wheel 1 (63); the frame (1) is rotatably connected to a synchronous wheel 2 (64); the side of the synchronous wheel 2 (64) close to the bevel gear 2 (62) is fixedly connected to a rotating rod (65); the side of the rotating rod (65) close to the synchronous wheel 2 (64) is fixedly connected to a fixed column 1 (66); the outer surface of the fixed column 1 (66) is movable A tension spring (67) is connected, and a side of the tension spring (67) away from the fixed column one (66) is movably connected to the fixed column two (68). A connecting seat (69) is fixedly connected inside the frame (1), and an inner ring surface of the connecting seat (69) is provided with an inner ring groove (6901). A rotating disk (610) is rotatably connected inside the connecting seat (69), and an annularly equidistantly arranged oblique grooves (611) are provided inside the connecting seat (69), and the oblique grooves (611) are provided with no less than four. A trapezoidal rod (612) is slidably connected inside the oblique groove (611), and a spring (613) is sleeved on the outer side of the trapezoidal rod (612).

2. A friction and wear testing machine for plastic packaging bags according to claim 1, characterized in that: The transmission column (53) is rotatably connected to the support frame (51), the aperture of the limiting groove (54) is matched to the diameter of the limiting column (56), the limiting groove (54) is slidably connected to the limiting column (56), and the sleeve (55) is rotatably connected to the frame (1).

3. A friction and wear testing machine for plastic packaging bags according to claim 1, characterized in that: The rotating assembly further comprises an annular groove (514) formed on the sleeve (55), wherein at least two of the annular grooves (514) are provided, a push-pull rod (515) is rotatably connected in the frame (1), a slide plate (516) is rotatably connected on a side of the push-pull rod (515) close to the sleeve (55), wherein at least two of the slide plates (516) are provided, and the slide plates (516) are slidably connected to the annular groove (514).

4. A friction and wear testing machine for plastic packaging bags according to claim 1, characterized in that: The number of teeth of the bevel gear 1 (61) is one quarter of the number of teeth of the bevel gear 2 (62); the bevel gear 2 (62) is rotationally connected to the support frame (51); the synchronous wheel 1 (63) is rotationally connected to the support frame (51); the synchronous wheel 1 (63) is transmission-connected to the synchronous wheel 2 (64) via a synchronous belt; the length of the rotating rod (65) is greater than the radius of the rotating disk (610); the fixed column 2 (68) is fixedly connected to the rotating disk (610); a notch is provided on the outer wall of the rotating disk (610), and the notch is adapted to the shape of the trapezoidal rod (612); and the spring (613) is fixedly connected to the inclined groove (611) and the trapezoidal rod (612), respectively.

5. The friction and wear testing machine for plastic packaging bags according to claim 1, characterized in that: The pressing assembly further comprises a connecting disk (614) fixedly connected to the rotating disk (610), wherein the connecting disk (614) is rotatably connected to a rotating rod (615) at an eccentric position away from a side of the connecting seat (69), and the rotating rod (615) is rotatably connected to the push-pull rod (515).

6. A friction and wear testing machine for plastic packaging bags according to claim 1, characterized in that: The cooling component comprises a synchronous wheel three (71) fixedly connected to the outer surface of the transmission column (53); a gear speed increasing device (72) is embedded in the upper surface of the frame (1); a synchronous wheel four (73) is fixedly connected to the input shaft of the gear speed increasing device (72); a disk (74) is fixedly connected to the output shaft of the gear speed increasing device (72); a connecting rod two (75) is rotatably connected at an eccentric position of the disk (74); a piston rod (76) is rotatably connected to a side of the connecting rod two (75) away from the disk (74); a piston cylinder (77) is fixedly connected to the upper surface of the frame (1); and a one-way air outlet pipe (78) is connected to the interior of the piston cylinder (77).

7. A friction and wear testing machine for plastic packaging bags according to claim 6, characterized in that: The synchronous wheel three (71) is transmission-connected to the synchronous wheel four (73) via a synchronous belt, the piston rod (76) is slidably connected to the piston cylinder (77), a suction hole is provided on a side of the piston cylinder (77) close to the connecting rod two (75), the one-way air outlet pipe (78) is fixedly connected to the support frame (51) and the frame (1), and an end of the one-way air outlet pipe (78) away from the piston cylinder (77) faces the operating table (2).

8. The friction and wear testing machine for plastic packaging bags according to claim 1, characterized in that: A fixing plate (31) is symmetrically fixedly connected to the upper surface of the operating table (2), and at least two fixing plates (31) are provided. A threaded sleeve (32) is fixedly connected to the fixing plate (31), and a threaded handle (33) is threadedly connected to the threaded sleeve (32). A lower pressing plate (34) is fixedly connected to the bottom of the threaded handle (33). A limiting strip (35) is symmetrically fixedly connected to the surface of the lower pressing plate (34), and at least four limiting strips (35) are provided. The limiting strips (35) pass through the fixing plate (31), and the limiting strips (35) are slidably connected to the fixing plate (31).

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