Novel pendulum bob tearing instrument

Abstract

A novel pendulum bob tearing instrument relates to the field of textile performance detection equipment and comprises a base, a pendulum bob mechanism, a pneumatic clamp, a buffer electromagnet and a resistance measuring mechanism, and the pendulum bob mechanism is rotatably arranged on the side face of the base around the axis in the horizontal direction; the pneumatic clamp comprises a fixed clamp arranged on the base and used for clamping one end of the sample and a movable clamp arranged on the pendulum bob mechanism and used for clamping the other end of the sample; the buffer electromagnet is located on a rotation track after the pendulum bob mechanism is released; the resistance measuring mechanism is used for measuring the resistance when the pendulum bob mechanism tears the to-be-tested sample so as to measure the anti-tearing performance of the fabric, after a metal swing arm is released to tear the to-be-tested sample, the number of times of backswing can be reduced by electrifying a buffer electromagnet and magnetically pulling the metal swing arm, and the sample can be quickly taken down without waiting for backswing stop; compared with traditional equipment, a non-contact buffering structure is adopted, collision of a pendulum bob mechanism is avoided, instrument errors caused by long-time collision impact are avoided, the accuracy of a detection result is improved, and the service life of the detection result is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of textile performance testing equipment, and specifically relates to a new pendulum tearing tester. Background Technique

[0002] The pendulum tearing test of textiles is a standard test method for evaluating the tear resistance of textile materials. This test simulates the tearing situations that the material may encounter during actual use, such as the forces exerted on clothing during wearing and washing. The pendulum tearing test can reproduce and quantify this tearing process under laboratory conditions, providing an important basis for the quality control and product research and development of textiles. The pendulum tearing test is usually carried out according to domestic and foreign standards such as ISO 13937-1, ASTM D1424, and GB / T 3917.1.

[0003] During the test, the textile sample is fixed on a fixture, and then a pendulum is used to impact the sample to simulate the tearing action. The weight, impact speed, and angle of the pendulum are all standardized to ensure the repeatability and accuracy of the test. The test equipment usually includes a fixture capable of fixing the sample, an adjustable-weight pendulum, a device for measuring the swing angle of the pendulum, and a sensor for recording the tearing force. The pendulum tearing test is widely used in the research and development, production, and quality control links of textiles. It not only helps manufacturers ensure the quality and performance of products but also assists consumers in understanding the durability of products and making more informed purchasing decisions. Currently, most pendulum testers clamp the sample by manually tightening screws or using a spring clamp. The strength of men and women when tightening the screws is different, resulting in the sample being easily slipped from the clamp during the test, and it is rather hand-hurting during the tightening process. After a period of use of the spring clamp, the clamping force of the spring will gradually weaken, which will also cause the sample to slip, thus affecting the test efficiency and consuming time and effort. Some pendulum tearing testers are provided with a blocking mechanism that can extend and block the pendulum after the pendulum is released to reduce the number of backswings. However, after long-term use of the equipment, it is prone to deviation due to the long-term collision of the pendulum with the blocking mechanism, resulting in the fixture no longer being in the same plane and affecting the test results, which needs to be improved. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a new pendulum tearing tester.

[0005] The utility model adopts the following technical solutions:

[0006] A novel pendulum tearing instrument, comprising a base, a pendulum mechanism, a pneumatic fixture, a buffer electromagnet and a resistance measuring mechanism. The pendulum mechanism includes a metal pendulum arm rotatably arranged on the side of the base around a horizontal axis and a counterweight on the metal pendulum arm. The pneumatic fixture includes a fixed fixture and a movable fixture. The fixed fixture is arranged on the base to clamp one end of the specimen. The movable fixture is arranged on the metal pendulum arm and can oppose the fixed fixture to clamp the other end of the specimen. The buffer electromagnet is arranged on the side of the base and on the rotation trajectory after the metal pendulum arm is released. The resistance measuring mechanism is arranged in the base and connected to the pendulum mechanism to measure the resistance when the pendulum mechanism tears the specimen to be tested so as to measure the fabric's anti-tearing performance.

[0007] Preferably, it further includes a release and fixation mechanism. The release and fixation mechanism is arranged on the side of the base opposite to the pendulum mechanism, and can fix the metal pendulum arm in a high gravitational potential energy state and release it. When the pendulum mechanism is in the high gravitational potential energy state, the fixed fixture and the movable fixture are on the same horizontal plane.

[0008] Preferably, it further includes a cutting mechanism for cutting a notch in the specimen to be tested. The cutting mechanism includes a cutting knife and a driving handle. The cutting knife is rotatably arranged on the base and can rotatably extend between the two pneumatic fixtures to cut the clamped specimen to be tested. The driving handle is connected to the cutting knife to drive its rotation.

[0009] Preferably, the resistance measuring mechanism includes a rotary encoder, a controller and an operation display panel. The rotary encoder is coaxially connected to the metal pendulum arm to monitor the rotation parameters of the metal pendulum arm. The controller is connected to the rotary encoder, receives the signal of the rotary encoder and calculates the resistance generated when the specimen to be tested is torn according to the rotation parameters. The operation display panel is connected to the controller and can input instructions to the controller or display the data output by the controller.

[0010] Preferably, the release and fixation mechanism is connected to the controller and includes a support cylinder, a pedal switch and a proximity switch. The support cylinder is arranged on the side of the base. When the metal pendulum arm is in the high gravitational potential energy state, the support cylinder extends outwards and supports under the metal pendulum arm. The pedal switch is connected to the support cylinder, and the controller controls the support cylinder to retract to release the metal pendulum arm according to the signal output by the pedal switch. The proximity switch is arranged on the side of the base and above the metal pendulum arm in the high gravitational potential energy state, and the controller controls the support cylinder to extend according to the signal of the proximity switch.

[0011] The metal pendulum arm is rotatably arranged on the side of the base through a rotary joint, and further includes extended sections extending from the rotary joint to both ends. The movable fixture is arranged on one side of the extended section, and a support rod is arranged on the other side of the extended section. The counterweight can be sleeved on the support rod.

[0012] Preferably, the metal swing arm is also provided with an auxiliary handle connected to the rotary joint, and the extension direction of the auxiliary handle is located on the central axis of the two extension sections.

[0013] Preferably, the end of the supporting cylinder is provided with a rubber sleeve which can contact the metal swing arm.

[0014] Preferably, it also includes an air circuit system connected to the pneumatic clamp and the supporting cylinder respectively, and the air circuit system is arranged in the base and connected to each component through an air pipe.

[0015] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects: the use of a pneumatic clamp can ensure the constant force when clamping the sample, avoid slippage caused by insufficient force applied by the operator or aging of the instrument, improve the stability of the equipment, and after the metal swing arm is released to tear the sample to be tested, the buffer electromagnet can be energized, and the magnetic force can pull the metal swing arm to reduce the number of swings, so that the sample can be quickly removed without waiting for the swing to stop. Compared with traditional equipment, the use of a non-contact buffer structure avoids the collision of the pendulum mechanism and the instrument error caused by long-term collision and impact, thereby improving the accuracy of the test results and the service life;

[0016] The release and fixation mechanism can fix the position of the pendulum mechanism so that it is in a high gravitational potential energy state and make the fixed fixture and the movable fixture on the same horizontal plane, which is convenient for installing the test sample on the two fixtures and ensures that the tearing can be carried out along the center line of the two fixtures;

[0017] The cutting mechanism is used to pre-cut a notch on the sample to be tested, which is conducive to the subsequent pendulum tearing;

[0018] The rotation parameters of the metal swing arm are measured by a rotary encoder. When the metal swing arm rotates and tears the sample, its rotation parameters change due to the test resistance. The controller calculates the tearing performance of the sample based on the rotation parameters.

[0019] After the experimenter steps on the pedal switch, the support cylinder is retracted, the metal swing arm is released, rotates downward and tears the test sample. When resetting, the operator lifts the metal swing arm again. When the metal swing arm rotates and lifts to the proximity switch, the proximity switch detects the metal swing arm and feeds back the signal to the controller. The controller controls the support cylinder to extend to support the metal swing arm.

[0020] The supporting cylinder contacts the metal swing arm through a rubber sleeve arranged at the end, which reduces wear and increases service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0022] Figure 2 Structural schematic of the present utility model Figure 2 ;

[0023] Figure 3 is Figure 1 the working state of the cutting mechanism at position A in Figure 1 ;

[0024] Figure 4 is Figure 1 the working state of the cutting mechanism at position A in Figure 2 ;

[0025] Figure 5 Structural schematic of the base of the present utility model;

[0026] Figure 6 Working process of the present utility model Figure 1 ;

[0027] Figure 7 Working process of the present utility model Figure 2 ;

[0028] Figure 8 Working process of the present utility model Figure 3 ;

[0029] In the figure: 1 - base; 2 - pendulum mechanism; 21 - metal swing arm; 211 - rotary joint; 212 - extension section; 213 - support rod; 22 - counterweight; 23 - auxiliary handle; 3 - pneumatic fixture; 31 - fixed fixture; 32 - movable fixture; 4 - buffer electromagnet; 5 - operation display panel; 6 - release and fixation mechanism; 61 - support cylinder; 62 - pedal switch; 63 - proximity switch; 64 - rubber sleeve; 7 - cutting mechanism; 71 - cutting knife; 72 - driving handle; 8 - air pipe. Specific embodiments

[0030] The present utility model will be further described below through specific embodiments.

[0031] Referring to Figures 1 to 8 shown, a new type of pendulum tearing tester includes a base 1, a pendulum mechanism 2, a pneumatic fixture 3, a buffer electromagnet 4, a resistance measurement mechanism, a release and fixation mechanism 6, a cutting mechanism 7, and a gas circuit system.

[0032] The pendulum mechanism 2 includes a metal pendulum arm 21 rotatably arranged on the side of the base 1 around a horizontal axis and a counterweight 22 arranged on the metal pendulum arm 21. The metal pendulum arm 21 is rotatably arranged on the side of the base 1 through a rotary joint 211, and further includes extended segments 212 extending from the rotary joint 211 to both ends. A moving fixture 32 is arranged on one side of the extended segment 212, and a support rod 213 is arranged on the other extended segment 212. The counterweight 22 can be sleeved on the support rod 213. An auxiliary handle 23 connected to the rotary joint 211 is also arranged on the metal pendulum arm 21. The extending direction of the auxiliary handle 23 is located on the central axis of the two extended segments 212, which is convenient for the operator to push the metal pendulum arm 21 to reset.

[0033] The pneumatic fixture 3 includes a fixed fixture 31 and a moving fixture 32. The fixed fixture 31 is arranged on the base 1 to clamp one end of the specimen; the moving fixture 32 is arranged on the metal pendulum arm 21 and can oppose the fixed fixture 31 to clamp the other end of the specimen. Using the pneumatic fixture 3 can ensure the constant force when clamping the specimen, avoid slipping caused by insufficient force applied by the operator or aging of the instrument, and improve the stability of the equipment.

[0034] The buffer electromagnet 4 is arranged on the side of the base 1 and on the rotation trajectory of the metal pendulum arm 21 after release. After being energized, it can magnetically attract the swinging-back metal pendulum arm 21 to reduce its number of swings back, enabling the specimen to be quickly removed without waiting for the pendulum to stop swinging. Compared with traditional equipment, the non-contact buffer structure avoids the collision of the pendulum mechanism 2, avoids the instrument error caused by long-term collision impact, and improves the accuracy of the detection result and the service life.

[0035] The resistance measurement mechanism is arranged in the base 1 and connected to the pendulum mechanism 2 to measure the resistance when the pendulum mechanism 2 tears the specimen to be tested to measure the fabric tear resistance. The resistance measurement mechanism includes a rotary encoder, a controller, and an operation display panel 5. The rotary encoder is coaxially connected to the metal pendulum arm 21 to monitor the rotation parameters of the metal pendulum arm 21; the controller is connected to the rotary encoder, receives the signal of the rotary encoder, and calculates the resistance generated when the specimen to be tested is torn according to the rotation parameters; the operation display panel 5 is connected to the controller, and can input instructions to the controller or display the data output by the controller. By measuring the rotation parameters of the metal pendulum arm 21 with the rotary encoder, when the metal pendulum arm 21 rotates and tears the specimen, its rotation parameters change under the action of the test resistance. The controller calculates the tear performance of the specimen according to the rotation parameters. The calculation method of using this rotary encoder to calculate the resistance is the prior art in this field, and no further description is made here. Specifically, the buffer electromagnet 4 is also connected to the controller, and its start-stop state is controlled by the controller.

[0036] The release and fixing mechanism 6 is arranged on the side of the base 1 opposite to the pendulum mechanism 2, and can fix the metal swing arm 21 in the high gravitational potential energy state and release it. When the pendulum mechanism 2 is in the high gravitational potential energy state, the fixed clamp 31 and the moving clamp 32 are at the same level, which is convenient for installing the specimen to be tested on the two clamps and ensuring that the tearing can be carried out along the midline of the two clamps. The release and fixing mechanism 6 is connected to the controller and includes a support cylinder 61, a pedal switch 62 and a proximity switch 63. The support cylinder 61 is arranged on the side of the base 1. When the metal swing arm 21 is in the high gravitational potential energy state, the support cylinder 61 extends outwards and supports under the metal swing arm 21; the pedal switch 62 extends from the base 1 to below the experimental platform and is controlled by the leg of the experimenter to be opened or closed, and is connected to the support cylinder 61. The controller controls the support cylinder 61 to retract according to the signal output by the pedal switch 62 to release the metal swing arm 21; the proximity switch 63 is arranged on the side of the base 1 and above the metal swing arm 21 in the high gravitational potential energy state, and the controller controls the support cylinder 61 to extend according to the signal of the proximity switch 63. After stepping on the pedal switch 62, the support cylinder 61 retracts, the metal swing arm 21 is released, rotates downward and tears the specimen to be tested. When resetting, the operator lifts the metal swing arm 21 again. When the metal swing arm 21 rotates and rises to the proximity switch 63, the proximity switch 63 detects the metal swing arm 21 and feeds back the signal to the controller, and the controller controls the support cylinder 61 to extend to support the metal swing arm 21. Specifically, a rubber sleeve 64 that can contact the metal swing arm 21 is arranged at the end of the support cylinder 61, which reduces the contact and friction between the cylinder and the metal swing arm 21 and improves the service life of the metal swing arm 21 and the support cylinder 61.

[0037] The cutting mechanism 7 includes a cutting knife 71 and a driving handle 72. The cutting knife 71 is rotatably arranged on the base 1 and can rotatably extend into the two pneumatic clamps 3 to cut the specimen to be tested after being clamped; the driving handle 72 is connected to the cutting knife 71 and can drive it to rotate. The cutting mechanism 7 is used to pre-cut a notch on the specimen to be tested, which is beneficial to the subsequent pendulum tearing.

[0038] The gas circuit system is arranged in the base 1 and is respectively connected to the pneumatic clamp 3 and the support cylinder 61, and is connected to each component through an air pipe 8. Among them, the air pipe 8 connected to the moving clamp 32 is longer, and its length needs to meet the lifting amount of driving the moving clamp 32 to rise after the pendulum mechanism 2 is released, so as to avoid interference caused by too short air pipe 8.

[0039] The controller is also connected to the pneumatic fixture 3 and the buffer electromagnet 4 respectively, and can control the operation of each component according to the instructions of the operation panel. The buffer electromagnet 4 is controlled by the controller to start when the pedal switch 62 is pressed and the metal swing arm 21 swings back for the first time, that is, it starts with a time delay after the pedal switch 62 is pressed. The time delay duration of this time delay instruction needs to be changed accordingly according to the different masses of the counterweight 22, and can be set on the operation panel, which can avoid the buffer electromagnet 4 from pulling when the metal swing arm 21 is released for the first time, thus affecting the accuracy of the test results.

[0040] During use, the device is powered on. The operator drives the auxiliary handle 23 to drive the metal swing arm 21 to rotate to a high gravitational potential energy state and then continues to rotate upward to block the proximity switch 63. After the proximity switch 63 detects the metal swing arm 21, it feeds back the signal to the controller. After the controller controls the support cylinder 61 to extend, the operator can lower the metal swing arm 21 and place it on the support cylinder 61. At this time, the metal swing arm 21 is in a high gravitational potential energy state, and the fixed fixture 31 and the movable fixture 32 are on the same horizontal plane. Then the operator places the test specimen to be tested on the two fixtures respectively and controls the two fixtures to clamp the test specimen to be tested through the operation display panel 5. Then the operator controls the drive handle 72 to drive the cutting knife 71 to rotate, cut a notch on the test specimen to be tested so that it can be torn along the notch direction later. Finally, the operator steps on the pedal switch 62 to control the support cylinder 61 to retract. The metal swing arm 21 starts to rotate under the action of the counterweight 22 and tears the test specimen to be tested. The rotary encoder monitors the rotation parameters of the metal swing arm 21 and feeds them back to the controller. The controller calculates the resistance generated when tearing the test specimen to determine the anti-tearing performance of the specimen. Compared with traditional equipment, the non-contact buffer structure adopted in this application avoids the collision of the pendulum mechanism 2, avoids the instrument error caused by long-term collision impact, and improves the accuracy of the detection results and the service life.

[0041] The above is only a preferred embodiment of the present invention, and thus cannot limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A new pendulum tearing instrument, characterized in that: It includes a base, a pendulum mechanism, a pneumatic clamp, a buffer electromagnet and a resistance measuring mechanism. The pendulum mechanism includes a metal swing arm which can rotate around a horizontal axis and is arranged on the side of the base, and a counterweight weight arranged on the metal swing arm; the pneumatic clamp includes a fixed clamp and a movable clamp. The fixed clamp is arranged on the base to clamp one end of the sample; the movable clamp is arranged on the metal swing arm and can be opposite to the fixed clamp and clamp the other end of the sample; the buffer electromagnet is arranged on the side of the base and is located on the rotation trajectory after the metal swing arm is released; the resistance measuring mechanism is arranged in the base and connected with the pendulum mechanism, and measures the resistance of the pendulum mechanism when tearing the test sample to measure the tear resistance of the fabric.

2. A novel pendulum tearing instrument according to claim 1, characterized in that: It also includes a releasing and fixing mechanism, which is arranged on the side of the base opposite to the pendulum mechanism, and can fix the metal swing arm in a high gravitational potential energy state and release it. When the pendulum mechanism is in a high gravitational potential energy state, the fixed clamp and the movable clamp are on the same horizontal plane.

3. A novel pendulum tearing instrument according to claim 1, characterized in that: It also includes a cutting mechanism for cutting a notch on the sample to be tested, the cutting mechanism includes a cutting knife and a driving handle, the cutting knife is rotatably arranged on the base, and can be rotatably extended into between the two pneumatic clamps to cut the clamped sample to be tested; the driving handle is connected to the cutting knife and can drive it to rotate.

4. A novel pendulum tearing instrument according to claim 2, characterized in that: The resistance measuring mechanism includes a rotary encoder, a controller and an operation display panel. The rotary encoder is coaxially connected to the metal swing arm to monitor the rotation parameters of the metal swing arm; the controller is connected to the rotary encoder, receives the signal of the rotary encoder and calculates the resistance generated when the test sample is torn according to the rotation parameters; the operation display panel is connected to the controller, and can input instructions to the controller or display data output by the controller.

5. A novel pendulum tearing instrument according to claim 4, characterized in that: The release and fixation mechanism is connected to the controller and includes a support cylinder, a pedal switch and a proximity switch. The support cylinder is arranged on the side of the base. When the metal swing arm is in a high gravitational potential energy state, the support cylinder extends outward and is supported under the metal swing arm. The pedal switch is connected to the support cylinder, and the controller controls the support cylinder to retract to release the metal swing arm according to the signal output by the pedal switch; the proximity switch is arranged on the side of the base and is located above the metal swing arm in a high gravitational potential energy state, and the controller controls the support cylinder to extend according to the signal of the proximity switch.

6. A novel pendulum tearing instrument according to claim 1, characterized in that: The metal swing arm can be rotatably arranged on the side of the base through a rotating joint, and also includes extension sections extending from the rotating joint to both ends. The movable clamp is arranged on the extension section on one side, and a support rod is arranged on the extension section on the other side. The counterweight can be sleeved on the support rod.

7. A novel pendulum tearing instrument according to claim 6, characterized in that: The metal swing arm is also provided with an auxiliary handle connected to the rotary joint, and the extension direction of the auxiliary handle is located on the central axis of the two extension sections.

8. A novel pendulum tearing instrument according to claim 5, characterized in that: The end of the supporting cylinder is provided with a rubber sleeve which can contact with the metal swing arm.

9. A novel pendulum tearing instrument according to claim 5, characterized in that: It also includes an air circuit system connected to the pneumatic clamp and the supporting cylinder respectively. The air circuit system is arranged in the base and connected to each component through an air pipe.

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