A film pendulum impact testing machine and testing method thereof

Abstract

The present invention relates to the technical field of pendulum impact testing machines, and in particular to a film pendulum impact testing machine and a testing method thereof. The technical scheme thereof comprises: a base, a column fixedly mounted on the base, a dial fixedly mounted on the column, a pendulum rod and an indicator needle rotatably mounted on the column, a clamping mechanism for fixing the film fixedly mounted on the column, and a positioning component mounted on the column, wherein the positioning component controls whether the indicator needle can rotate according to the rotation speed of the pendulum rod. The present invention can fix the indicator needle after the pendulum rod rises to the limit position through the positioning component, which can effectively prevent the indicator needle from continuing to move under the action of inertia, and makes it unnecessary to set damping at the rotation connection between the indicator needle and the column, thereby avoiding the loss of kinetic energy of the pendulum rod caused by damping, thereby effectively improving the accuracy of the detection structure.

Description

Technical Field

[0001] The invention relates to the technical field of pendulum impact testing machines, and in particular to a thin film pendulum impact testing machine and a testing method thereof. Background Art

[0002] Food packaging materials need to have certain impact resistance to ensure that they are not easily damaged during transportation, loading and unloading, and storage. The pendulum impact test can be used to test the packaging film's ability to resist rupture when subjected to accidental impact. The film pendulum impact tester is a laboratory device used to test the impact resistance of film materials. It evaluates the material's impact toughness and fracture resistance by simulating the high-speed impact conditions that the material may encounter in actual applications.

[0003] Patent document CN222144765U discloses a pendulum impact tester for plastic film, and specifically discloses the following technical features: base, support rod, pendulum mechanism, scale line, fixing device; the tester starts the device first, the electromagnet is energized, and then the pendulum mechanism is rotated to absorb the electromagnet with the suction block, and then the height of the driving part and the fixing device is adjusted. After the height adjustment is completed, the film is placed on the fixing device, and the start button is pressed. The computer controls the cylinder to drive the telescopic rod to press the pressure plate to press the film, the electromagnet is powered off, and the pendulum mechanism is rotated by gravity to perform an impact test on the film. The device moves the indicator needle by the pendulum, and the position where the indicator needle stays is the height after the pendulum rises. However, in order to prevent the indicator needle from sliding under the action of inertia, it is necessary to provide damping at the connection between the indicator needle and its rotation, but the damping setting will increase the resistance of the indicator needle when it rotates, which will increase the resistance of the pendulum when it rises, and then cause the height of the pendulum to decrease after it rises, which is conducive to improving the accuracy of the experimental data. Summary of the invention

[0004] The purpose of the present invention is to address the problems existing in the background technology and to provide a thin film pendulum impact testing machine and a testing method thereof.

[0005] On the one hand, the present invention provides a film pendulum impact tester, comprising a base, a column fixedly mounted on the base, a dial fixedly mounted on the column, a pendulum rod and an indicator needle rotatably mounted on the column, a clamping mechanism for fixing the film fixedly mounted on the column, and further comprising:

[0006] A positioning component is installed on the column, and the positioning component controls whether the indicating needle can rotate according to the rotation speed of the swing rod.

[0007] Optionally, a swing arm is fixedly mounted on the swing rod, a weight is detachably mounted on the swing rod, and a driving arm is fixedly mounted on the swing rod.

[0008] Optionally, an electromagnet is fixedly mounted on the column, and a metal block is fixedly mounted on the swing arm.

[0009] Optionally, the positioning component includes a limiting ring fixedly mounted on the column, an annular cavity is provided in the limiting ring, the annular cavity is filled with hydraulic oil, the annular cavity is connected with the interior of the limiting ring, a sealing ring is rotatably mounted on the limiting ring, a blocking plate is fixedly mounted on the indicator needle, the blocking plate is located inside the annular cavity and blocks the annular cavity, a dividing block is fixedly mounted in the annular cavity, a flow pipe is provided on the limiting ring and on both sides of the dividing block, the flow pipe is connected with the annular cavity, and a valve is fixedly mounted on the two flow pipes.

[0010] Optionally, the valve includes a valve body fixedly mounted on the two flow pipes, a valve core is rotatably mounted in the valve body, and an opening and closing mechanism for controlling the rotation of the valve core is mounted on the column.

[0011] Optionally, the opening and closing mechanism includes a connecting rod fixedly mounted on the valve core, a connecting cylinder rotatably mounted on the column, a first liquid storage chamber being arranged in the connecting cylinder, a driving rod being slidably mounted in the first liquid storage chamber, the driving rod being rotatably connected to the connecting cylinder, a hydraulic box being fixedly mounted on the column, a second liquid storage chamber being arranged in the hydraulic box, a sealing plate being slidably mounted in the second liquid storage chamber, a pressure rod being fixedly mounted on the sealing plate, the first liquid storage chamber and the second liquid storage chamber being connected by an oil pipe, the first liquid storage chamber and the second liquid storage chamber being both filled with hydraulic oil, and a transmission assembly for driving the pressure rod to move is mounted on the column.

[0012] Optionally, the cross-sectional area of ​​the first liquid storage cavity is smaller than the cross-sectional area of ​​the second liquid storage cavity.

[0013] Optionally, the transmission assembly includes an arc-shaped plate fixedly mounted on the column, a slide groove is provided in the arc-shaped plate, a slide plate is slidably mounted in the slide groove, a plurality of grooves are provided on the slide plate, a connecting block is fixedly mounted on the slide plate, a connecting rod is rotatably mounted on the connecting block, the other end of the connecting rod is rotatably connected to the pressure rod, and a power assembly for driving the slide plate to move is installed on the swing arm.

[0014] Optionally, the power assembly includes a bent tube fixedly mounted on the rocker arm, the bent tube having an angle with the horizontal, a mounting cavity being provided in the bent tube, a counterweight rod being slidably mounted in the mounting cavity, a pin being fixedly mounted on the counterweight rod, a spring being fixedly mounted in the mounting cavity, and the other end of the spring being fixedly connected to the counterweight rod.

[0015] On the other hand, the present invention provides a thin film pendulum impact test method, which is applied to the thin film pendulum impact tester described above, and the method comprises the following steps:

[0016] Step 1: Install the film on the clamping mechanism;

[0017] Step 2: Turn the pendulum and start the electromagnet to make the metal block fit with the electromagnet and absorb the metal block through the electromagnet;

[0018] Step 3: Turn the indicator needle to the rightmost side of the dial;

[0019] Step 4: Turn off the electromagnet, so that the swing rod descends under the action of gravity and drives the swing arm to impact the film;

[0020] Step 5: The rotating pendulum drives the driving arm to contact the indicator needle, and drives the indicator needle to rotate;

[0021] Step 6: When the pendulum rises to the limit position, the speed of the pendulum is 0, and the indicator needle is fixed by the positioning component.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] The positioning component can be used to fix the indicator needle after the pendulum arm rises to the limit position, which can effectively prevent the indicator needle from continuing to move under the action of inertia, and make it unnecessary to set damping at the rotational connection between the indicator needle and the column, thereby avoiding the loss of kinetic energy of the pendulum arm caused by damping, and thus effectively improving the accuracy of the detection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the pendulum impact testing machine of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the positioning component;

[0026] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 It is a schematic diagram of the structure inside the limiting ring;

[0028] Figure 5 It is a three-dimensional structural diagram of the limiting ring;

[0029] Figure 6 It is a structural schematic diagram of the opening and closing mechanism of the present invention;

[0030] Figure 7 is a schematic diagram of the structure of the transmission component;

[0031] Figure 8 It is a schematic diagram of the structure of the power assembly of the present invention.

[0032] Figure numerals: 1, base; 101, column; 102, dial; 103, swing rod; 104, swing arm; 105, weight; 106, indicator needle; 107, drive arm; 2, electromagnet; 201, metal block; 3, clamping mechanism; 4, limit ring; 401, annular cavity; 402, blocking ring; 403, blocking plate; 404, partition block; 405, flow pipe; 406, valve body; 407, valve core; 5, connection rod; 501, connecting tube; 502, first liquid storage chamber; 503, driving rod; 504, hydraulic box; 505, second liquid storage chamber; 506, sealing plate; 507, pressure rod; 508, oil pipe; 6, arc plate; 601, slide groove; 602, slide plate; 603, groove; 604, connecting block; 605, connecting rod; 606, bent pipe; 607, installation chamber; 608, counterweight rod; 609, pin; 610, spring. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Examples, such as Figures 1 to 8 As shown, on the one hand, the present invention proposes a film pendulum impact tester, comprising a base 1, a column 101 fixedly mounted on the base 1, a dial 102 fixedly mounted on the column 101, a pendulum 103 and an indicator needle 106 rotatably mounted on the column 101, and the impact resistance of the film can be judged by the coordinated use of the indicator needle 106 and the dial 102. A swing arm 104 is fixedly mounted on the pendulum 103, and a weight 105 is detachably mounted on the pendulum 103. By adding or reducing the weight 105, the initial gravitational potential energy of the pendulum 103 can be adjusted, and a variable experiment can be performed. A driving arm 107 is fixedly mounted on the pendulum 103. The driving arm 107 can contact the indicator needle 106, and then the indicator needle 106 can be driven to rotate by the driving arm 107 (the above are all prior arts and will not be described in detail here).

[0035] Furthermore, a clamping mechanism 3 for fixing the film is fixedly mounted on the column 101, and the film can be clamped and fixed by the clamping mechanism 3 (this is a prior art and will not be described in detail here). An electromagnet 2 is fixedly mounted on the column 101, and a metal block 201 is fixedly mounted on the swing rod 103. The electromagnet 2 attracts the metal block 201, so that the initial position of the swing rod 103 can be fixed by the electromagnet 2, and when the electromagnet 2 is powered off, the swing rod 103 can rotate downward under the action of gravity, so that the gravitational potential energy of the swing rod 103 is converted into kinetic energy.

[0036] This embodiment also includes a positioning component installed on the column 101, and the positioning component controls whether the indicator needle 106 can rotate according to the rotation speed of the swing rod 103. The positioning component includes a limit ring 4 fixedly installed on the column 101, and an annular cavity 401 is provided in the limit ring 4. The annular cavity 401 is filled with hydraulic oil. The annular cavity 401 is connected with the inside of the limit ring 4. A blocking ring 402 is rotatably installed on the limit ring 4, and the blocking ring 402 blocks the annular cavity 401 to prevent the hydraulic oil inside the annular cavity 401 from leaking. A blocking plate 403 is fixedly installed on the indicator needle 106, and the blocking plate 403 is located inside the annular cavity 401 and blocks the annular cavity 401. A partition block 404 is fixedly installed in the annular cavity 401, and the annular cavity 401 is divided into two independent cavities by the partition block 404 and the blocking plate 403. By rotating the blocking plate 403 to drive the blocking ring 402 to rotate, the size of the two independent cavities in the annular cavity 401 can be adjusted. A flow pipe 405 is provided on the limiting ring 4 and on both sides of the partition block 404. The flow pipe 405 is connected to the annular cavity 401, and a valve is fixedly installed on the two flow pipes 405. When the valve is opened, the hydraulic oil in the two independent cavities can flow to each other, thereby enabling the blocking plate 403 to rotate. When the valve is closed, the blocking plate 403 cannot rotate. Since the blocking plate 403 is fixedly connected to the indicator needle 106, the indicator needle 106 cannot rotate when the valve is closed.

[0037] The valve includes a valve body 406 fixedly mounted on two flow pipes 405, a valve core 407 is rotatably mounted in the valve body 406, and an opening and closing mechanism for controlling the rotation of the valve core 407 is mounted on the column 101. The state of the valve core 407 inside the valve body 406 can be controlled by rotating the valve core 407, and the valve body 406 can be blocked by the valve core 407.

[0038] Furthermore, the opening and closing mechanism includes a connecting rod 5 fixedly installed on the valve core 407, a connecting cylinder 501 is rotatably installed on the column 101, a first liquid storage chamber 502 is provided in the connecting cylinder 501, a driving rod 503 is slidably installed in the first liquid storage chamber 502, the driving rod 503 is rotatably connected to the connecting cylinder 501, a hydraulic box 504 is fixedly installed on the column 101, a second liquid storage chamber 505 is provided in the hydraulic box 504, a sealing plate 506 is slidably installed in the second liquid storage chamber 505, a pressure rod 507 is fixedly installed on the sealing plate 506, the first liquid storage chamber 502 and the second liquid storage chamber 505 are connected by an oil pipe 508, the first liquid storage chamber 502 and the second liquid storage chamber 505 are both filled with hydraulic oil, and a transmission component for driving the pressure rod 507 to move is installed on the column 101. When the pressure rod 507 is driven to move by the transmission assembly, the pressure rod 507 will drive the sealing plate 506 to move, and the moving sealing plate 506 will squeeze the hydraulic oil inside the hydraulic box 504, so that the hydraulic oil can enter the connecting tube 501 through the oil pipe 508. The hydraulic oil entering the connecting tube 501 will push the driving rod 503 to move, and the moving driving rod 503 will drive the connecting rod 5 to rotate, thereby driving the valve core 407 to rotate, so as to control the opening and closing state of the valve. It is worth noting that when the driving rod 503 extends outward, the connecting tube 501 will rotate, so the oil pipe 508 needs to be provided with a certain margin and can be bent within a certain range.

[0039] It should be noted that the cross-sectional area of ​​the first liquid storage chamber 502 is smaller than the cross-sectional area of ​​the second liquid storage chamber 505. Such a design makes the distance that the sealing plate 506 moves inside the hydraulic box 504 smaller than the distance that the driving rod 503 moves inside the connecting tube 501, which can achieve a doubling effect, thereby speeding up the closing speed of the valve, and the larger the ratio of the cross-sectional area of ​​the second liquid storage chamber 505 to the cross-sectional area of ​​the first liquid storage chamber 502, the faster the moving speed of the driving rod 503.

[0040] In this embodiment, the transmission assembly includes an arc plate 6 fixedly mounted on the column 101, a slide groove 601 is provided in the arc plate 6, a slide plate 602 is slidably mounted in the slide groove 601, a plurality of grooves 603 are provided on the slide plate 602, and a connecting block 604 is fixedly mounted on the slide plate 602. A connecting rod 605 is rotatably mounted on the connecting block 604, and the other end of the connecting rod 605 is rotatably connected to the pressure rod 507, and a power assembly for driving the slide plate 602 to move is installed on the swing rod 103. When the power assembly drives the slide plate 602 to move, the slide plate 602 will drive the connecting block 604 to move, and the moving connecting block 604 will drive the connecting rod 605 to rotate, and the connecting rod 605 can push the pressure rod 507 to move.

[0041] The power assembly includes a curved tube 606 fixedly mounted on the swing rod 103, with an angle between the curved tube 606 and the horizontal, a mounting cavity 607 provided in the curved tube 606, a counterweight rod 608 slidably mounted in the mounting cavity 607, a plug pin 609 fixedly mounted on the counterweight rod 608, a spring 610 fixedly mounted in the mounting cavity 607, and the other end of the spring 610 is fixedly connected to the counterweight rod 608. When the swing rod 103 rotates under the action of gravity, the curved tube 606 and the counterweight rod 608 will be driven to rotate. A counterweight ball is provided at the end of the counterweight rod 608, which will drive the counterweight rod 608 to move outward under the action of centrifugal force during rotation, thereby driving the plug pin 609 to move. When the swing rod 103 rises to the limit position and the speed is 0, the counterweight rod 608 will shrink into the mounting cavity 607 under the action of the spring 610, and the plug pin 609 will move toward the direction close to the slide plate 602, so that the plug pin 609 can move. The needle 609 enters the groove 603. At this time, the pin 609 will drive the slide plate 602 to move as the rocker arm 103 descends, so that after the rocker arm 103 rises to the limit position, the valve can be immediately closed and the indicator needle 106 can be fixed to prevent the indicator needle 106 from continuing to move under the action of inertia. The rotation connection between the indicator needle 106 and the column 101 does not need to be damped, thereby avoiding the loss of kinetic energy of the rocker arm 103 caused by damping, thereby effectively improving the accuracy of the detection structure.

[0042] On the other hand, the present invention provides a thin film pendulum impact test method, which is applied to the above thin film pendulum impact tester, and the method comprises the following steps:

[0043] Step 1: Install the film on the clamping mechanism 3;

[0044] Step 2: Rotate the swing rod 103 and start the electromagnet 2, so that the metal block 201 fits with the electromagnet 2, and the electromagnet 2 adsorbs the metal block 201;

[0045] Step 3: Rotate the indicator needle 106 to the rightmost side of the dial 102;

[0046] Step 4: Turn off the electromagnet 2, so that the swing rod 103 descends under the action of gravity, and drives the swing arm 104 to impact the film;

[0047] Step 5: The rotating swing rod 103 drives the driving arm 107 to contact the indicator needle 106, and drives the indicator needle 106 to rotate;

[0048] Step 6: When the pendulum rod 103 rises to the limit position, the speed of the pendulum rod 103 is 0, and the indicator needle 106 is fixed by the positioning component.

[0049] The working principle of this embodiment is as follows: when the swing rod 103 rotates under the action of gravity, it will drive the bent pipe 606 and the counterweight rod 608 to rotate. During the rotation, the counterweight rod 608 will be driven to move outward under the action of centrifugal force, thereby driving the insertion pin 609 to move. When the swing rod 103 rises to the limit position and the speed is 0, the counterweight rod 608 will shrink toward the inside of the installation cavity 607 under the action of the spring 610. At this time, the insertion pin 609 will move toward the direction close to the slide plate 602, so that the insertion pin 609 enters the inside of the groove 603. At this time, the insertion pin 609 will drive the slide plate 602 to move as the swing rod 103 descends, and the slide plate 602 will drive the connecting block 604 to move. The moving connecting block 604 will drive the connecting rod 605 to rotate, and the connecting rod 605 can push the pressure rod 507 to move. The pressure rod 507 will drive the sealing plate 506 to move, and the moving sealing plate 506 will squeeze the hydraulic oil inside the hydraulic box 504, so that the hydraulic oil can enter the connecting tube 501 through the oil pipe 508. The hydraulic oil entering the connecting tube 501 will push the driving rod 503 to move, and the moving driving rod 503 will drive the connecting rod 5 to rotate, and then drive the valve core 407 to rotate, so as to control the opening and closing state of the valve. The annular cavity 401 is divided into two independent cavities by the partition block 404 and the plugging plate 403. When the valve is opened, the hydraulic oil in the two independent cavities can flow to each other, so that the plugging plate 403 can rotate. When the valve is closed, the plugging plate 403 will not be able to rotate. Since the plugging plate 403 is fixedly connected to the indicator needle 106, the indicator needle 106 will not be able to rotate when the valve is closed.

[0050] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A film pendulum impact tester, comprising a base (1), a column (101) fixedly mounted on the base (1), a dial (102) fixedly mounted on the column (101), a pendulum rod (103) and an indicator needle (106) rotatably mounted on the column (101), and a clamping mechanism (3) for fixing a film fixedly mounted on the column (101), characterized in that: Also includes: A positioning component mounted on the column (101), wherein the positioning component controls whether the indicator needle (106) rotates according to the rotation speed of the swing rod (103); The positioning component comprises a limit ring (4) fixedly mounted on the column (101), an annular cavity (401) being provided in the limit ring (4), the annular cavity (401) being filled with hydraulic oil, the annular cavity (401) being communicated with the interior of the limit ring (4), a blocking ring (402) being rotatably mounted on the limit ring (4), a blocking plate (403) being fixedly mounted on the indicator needle (106), the blocking plate (403) being located inside the annular cavity (401) and blocking the annular cavity (401), a partition block (404) being fixedly mounted in the annular cavity (401), a flow pipe (405) being provided on the limit ring (4) and located on both sides of the partition block (404), the flow pipe (405) being communicated with the annular cavity (401), and a valve being fixedly mounted on each of the two flow pipes (405); The valve comprises a valve body (406) fixedly mounted on the two flow pipes (405), a valve core (407) rotatably mounted in the valve body (406), and an opening and closing mechanism for controlling the rotation of the valve core (407) is mounted on the column (101); The opening and closing mechanism comprises a connecting rod (5) fixedly mounted on the valve core (407); a connecting cylinder (501) is rotatably mounted on the column (101); a first liquid storage chamber (502) is provided in the connecting cylinder (501); a driving rod (503) is slidably mounted in the first liquid storage chamber (502); the driving rod (503) is rotatably connected to the connecting cylinder (501); a hydraulic box (504) is fixedly mounted on the column (101); the hydraulic box (504) ) is provided with a second liquid storage chamber (505), a sealing plate (506) is slidably installed in the second liquid storage chamber (505), a pressure rod (507) is fixedly installed on the sealing plate (506), the first liquid storage chamber (502) and the second liquid storage chamber (505) are connected through an oil pipe (508), the first liquid storage chamber (502) and the second liquid storage chamber (505) are both filled with hydraulic oil, and a transmission component for driving the pressure rod (507) to move is installed on the column (101).

2. A thin film pendulum impact testing machine according to claim 1, characterized in that: A swing arm (104) is fixedly mounted on the swing rod (103), a weight (105) is detachably mounted on the swing rod (103), and a driving arm (107) is fixedly mounted on the swing rod (103).

3. A thin film pendulum impact testing machine according to claim 2, characterized in that: An electromagnet (2) is fixedly mounted on the upright column (101), and a metal block (201) is fixedly mounted on the swing rod (103).

4. A thin film pendulum impact testing machine according to claim 1, characterized in that: The cross-sectional area of ​​the first liquid storage chamber (502) is smaller than the cross-sectional area of ​​the second liquid storage chamber (505).

5. A thin film pendulum impact testing machine according to claim 4, characterized in that: The transmission assembly comprises an arc-shaped plate (6) fixedly mounted on a column (101), a slide groove (601) being provided in the arc-shaped plate (6), a slide plate (602) being slidably mounted in the slide groove (601), a plurality of grooves (603) being provided on the slide plate (602), a connecting block (604) being fixedly mounted on the slide plate (602), a connecting rod (605) being rotatably mounted on the connecting block (604), the other end of the connecting rod (605) being rotatably connected to the pressure rod (507), and a power assembly for driving the slide plate (602) to move being mounted on the swing rod (103).

6. A thin film pendulum impact testing machine according to claim 5, characterized in that: The power assembly comprises a curved tube (606) fixedly mounted on the swing rod (103), the curved tube (606) having an angle with the horizontal, a mounting cavity (607) being provided in the curved tube (606), a counterweight rod (608) being slidably mounted in the mounting cavity (607), a pin (609) being fixedly mounted on the counterweight rod (608), a spring (610) being fixedly mounted in the mounting cavity (607), and the other end of the spring (610) being fixedly connected to the counterweight rod (608).

7. A film pendulum impact test method, using the film pendulum impact tester according to any one of claims 1 to 6, the method comprising the following steps: Step 1: Install the film on the clamping mechanism (3); Step 2: rotating the swing rod (103) and activating the electromagnet (2) so that the metal block (201) fits the electromagnet (2) and the electromagnet (2) adsorbs the metal block (201); Step 3: Rotate the indicator needle (106) so that the indicator needle (106) rotates to the rightmost side of the dial (102); Step 4: Turn off the electromagnet (2), so that the swing rod (103) descends under the action of gravity and drives the swing arm (104) to impact the film; Step 5: The rotating swing rod (103) drives the driving arm (107) to contact the indicator needle (106), and drives the indicator needle (106) to rotate; Step 6: When the pendulum rod (103) rises to the limit position, the speed of the pendulum rod (103) is 0, and at this time, the indicator needle (106) is fixed by the positioning component.

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