Device and method for testing wear resistance of finger
By designing a finger wear-resistant test device, including scratching components of five shafts, five weights and five grinding heads, the existing testers solve the problems of uneven contact area and uneven force when measuring the mechanical properties of glove hands, achieving more accurate test results.
Patent Information
- Application Number
- CN202411776343.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-03-07
AI Technical Summary
The existing five-finger scratch testers have problems of uneven contact area and uneven force when measuring the mechanical properties of glove hands, which affects the accuracy of the test results.
A finger wear-resistant test device is designed, including a scratch assembly and a sample set. The scratch assembly consists of five shafts, five weights and five grinding heads. The grinding head adopts a triangular column structure to increase the area in contact with the sample and is reinforced by shock absorption and damping through nuts and washers.
The test device can more effectively increase the contact area between the grinding head and the sample, make the stress on the sample surface uniform, improve the accuracy of the test results, and better adapt to the determination of the mechanical resistance of the glove hand.
Smart Images
Figure CN119574360A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of wear resistance testing equipment, and in particular to a finger wear resistance testing device and method. Background Art
[0002] The five-finger scratch tester is designed for plastic material evaluation, hard material wear resistance, paint, ink, soft metal, oil carpet, accessories and other material testing. This instrument meets a variety of test standards, and the test platform's movement stroke, movement speed and reciprocating cycle can be set as needed. During the five-finger scratch tester test, the sample on the test platform contacts five scraping fingers or one plastic scraping finger and the weight applied above it. During the test, the test platform moves, and the scraping fingers leave scratches on the surface of the sample. The scratch resistance of the sample is judged based on the depth of the scratches.
[0003] This application will improve the five-finger scratch tester so that it can be better used in the determination of the mechanical resistance of gloves. Summary of the invention
[0004] The object of the present invention is to provide a finger wear resistance testing device and method to solve one or more of the above-mentioned prior art problems.
[0005] The present invention proposes a finger wear resistance testing device, including a scraping assembly, which includes a shaft, a weight and a grinding head. The grinding head includes a head in the shape of a triangular prism and a connecting part. One side of the head is connected to the connecting part, which is cylindrical and has a thread on its outer surface.
[0006] In some embodiments, The head is a regular triangular prism, and the angle a between the other two sides of the head is 90°; A transition section is provided between the head and the connecting portion, and the transition section is coaxially arranged with the connecting portion; A connection between two side surfaces on the head that are not connected to the connection portion is chamfered to form an auxiliary plane at the connection.
[0007] In some embodiments, the grinding heads are symmetrically distributed about the center line in both the left-right direction and the front-back direction.
[0008] In some embodiments, the connection portion is provided with a nut and a washer adapted to the connection portion, and the nut is connected to the connection portion via a thread, so that the effects of shock absorption and reinforcement are achieved through the design of the nut and the washer.
[0009] In some embodiments, The scraping assembly includes five shafts and five weights, the weights are arranged in one-to-one correspondence with the shafts, the weights are rotatably connected to the corresponding shafts, and a grinding head is installed at the bottom of each shaft; The finger wear test device also includes a sample plate arranged corresponding to the scratching component and a fixture for fixing the sample plate.
[0010] In some embodiments, The clamp is a movable clamp; The finger wear test device also includes a cardboard, one end surface of the cardboard is used to stick the sample to be tested for wear, and the other end surface of the cardboard is stuck on the sample plate; The cardboard is formed by pasting a plurality of cardboards.
[0011] In some embodiments, The cardboard is made of three pieces of cardboard glued together.
[0012] A finger wear resistance test method, the test method uses the above-mentioned finger wear resistance test device, and the finger wear resistance test method specifically includes the following steps: Take samples by cutting the corresponding parts of the fingers from the pure liner on the back of the glove, and take samples from the corresponding parts of the five fingers; Fix, stick the sample to the corresponding cardboard, stick the cardboard to the sample board, then place the five samples on the sample board under the five grinding heads respectively, and fix the sample board with a clamp; Put down the weight and the grinding head, so that the grinding head is placed on the test surface of the corresponding sample; Set parameters, including experimental moving speed, moving distance, and number of turns in a cycle; Test, finger wear test device starts working; If the bottom of the sample is exposed, the corresponding weight is lifted, the corresponding test ends, and the corresponding tests of other samples continue; Record relevant information, including photos of sample wear and the number of circles when the sample is exposed at the bottom corresponding to the five grinding heads.
[0013] In some embodiments, The specific process of sampling is as follows: cut the corresponding part of the finger from the pure liner on the back of the glove, press the sampling plate on the five fingers near the fingertips avoiding the joint seams on both sides of the fingers, draw the sampling outline, and cut it with scissors as the sample; The sample wear photos in the relevant information are photos of the sample wear taken under the same lighting and the same shooting angle.
[0014] In some embodiments, The size of the sampling plate is 2.5cm*7cm; During the fixing process, the sample plate needs to be fixed so that the grinding head can move 5cm on the corresponding sample; The set parameters are: experimental moving speed is 60㎜ / s, moving distance is 50㎜, and the number of circles in one cycle is 200.
[0015] The advantages of the finger wear test device and method described in the present invention are: the above test device can be improved on the basis of the existing five-finger scratch tester, which can not only maintain the advantages of the original five-finger scratch tester, but also make it better adapted to the determination of the mechanical resistance of the glove hand. The test device and method can be used to judge the wear resistance of the dipped glove fingers by the number of turns when the surface dipped glue is worn through, that is, when the liner just leaks out. In addition, the design of the above grinding head can effectively increase the contact area between the grinding head and the sample compared to the scraping finger on the existing five-finger scratch tester, and can make the force on the sample surface uniform. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagram of the structure of the grinding head in some embodiments of the present invention; Figure 2 A front side view of the grinding head after the nut and washer are installed in some embodiments of the present invention; Figure 3 A left side view of a grinding head in some embodiments of the present invention; Figure 4 A schematic diagram of the phenomenon of abrasion resistance of a dipped glove during the state of finger friction in some embodiments of the present invention; Figure 5 It is a schematic diagram of the phenomenon of abrasion resistance of another dipped glove during the state of finger friction in some embodiments of the present invention. DETAILED DESCRIPTION
[0017] Combination Figures 1 to 3 The content shown in this embodiment describes a finger wear test device, including a scraping assembly and a sample plate corresponding to the scraping assembly. The scraping assembly includes five shafts, five weights and five grinding heads. Each shaft is equipped with a weight and a grinding head, wherein the weight is rotatably connected to the corresponding shaft, and the grinding head is installed at the bottom of the corresponding shaft. The grinding head includes a head 1 in the form of a triangular prism and a connecting portion 3, one side of the head 1 is connected to the connecting portion 3, the connecting portion 3 is cylindrical, and the outer surface of the connecting portion 3 is provided with threads.
[0018] The head 1 is in the shape of a regular triangular prism, and the angle a between the other two side surfaces of the head 1, the first side surface 101 and the second side surface 102, is 90°; A transition section 2 is provided between the head 1 and the connecting portion 3, and the transition section 2 is coaxially arranged with the connecting portion 3; The connection between the two side surfaces of the head 1 that are not connected to the connection portion 3, namely the first side surface 101 and the second side surface 102, is chamfered to form an auxiliary plane 103 at the connection.
[0019] The design of the grinding head structure replaces the existing circular grinding head simulating the scratching of human fingers through a surface contact, so as to better and more accurately reflect the effect of scratching.
[0020] The grinding heads are symmetrically distributed about the center line L in the left-right direction and the front-back direction.
[0021] The connection part 3 can be additionally provided with a nut 4 and a washer 5 adapted to the connection part 3 to reduce the probability of vibration and loosening of the grinding head after long-term scraping, thereby achieving the effect of shock absorption and reinforcement. The nut 4 is connected to the connection part 3 by a thread.
[0022] The finger wear test device also includes a fixture for fixing the sample plate, which can be a movable fixture and can be directly implemented using an existing structure as long as the fixture can fix the sample plate at a desired position below the corresponding scratching component.
[0023] In addition, the finger sample was placed on the sample board, and the test sample was fixed as a whole with double-sided tape for testing. It was found that the test sample itself was elastic, resulting in uneven force during the scratching process, which affected the accuracy of the data. Therefore, in some specific implementations, a cardboard is added to the finger wear test device, and one end surface of the cardboard is used to paste the sample that needs to be tested for wear resistance, and the other end surface of the cardboard is glued to the sample board; the cardboard can be made of multiple pieces of cardboard. For example: three pieces of cardboard are glued to form a cardboard using two layers of double-sided tape, and its specific setting structure can be from bottom to top: metal sample board + fixed double-sided tape + cardboard + double-sided tape + cardboard + double-sided tape + cardboard + fixed double-sided tape + sample. Through the design of the cardboard, on the one hand, the back of the sample is prevented from directly contacting the metal sample board during the scratching process to produce abnormal damage, which directly affects the test results; on the other hand, after the test is completed, the five finger samples can be completely peeled off from the metal sample board together with the cardboard without destroying the shape after the test, so as to facilitate analysis and tracing. The finger wear test device can directly use the existing five-finger tester, such as T113 five-finger scratch resistance tester. It only needs to replace the scraping fingers on the existing five-finger scratch resistance tester with the above-mentioned grinding head, and adjust and replace the weights thereon as needed.
[0024] A finger wear resistance test method, the test method uses the above-mentioned finger wear resistance test device, and the finger wear resistance test method specifically includes the following steps: Take samples by cutting the corresponding parts of the fingers from the pure liner on the back of the glove, and take samples from the corresponding parts of the five fingers; Fix, stick the sample to the corresponding cardboard, stick the cardboard to the sample board, then place the five samples on the sample board under the five grinding heads respectively, and fix the sample board with a clamp; Put down the weight and the grinding head, so that the grinding head is placed on the test surface of the corresponding sample; Set parameters, including experimental moving speed, moving distance, and number of turns in a cycle; Test, finger wear test device starts working; If the bottom of the sample is exposed, the corresponding weight is lifted, the corresponding test ends, and the corresponding tests of other samples continue; Record relevant information, including photos of sample wear and the number of circles when the sample is exposed at the bottom corresponding to the five grinding heads.
[0025] It should be noted that The specific process of sampling is as follows: cut the corresponding part of the finger from the pure liner on the back of the glove, press the sampling plate on the five fingers near the fingertips avoiding the joint seams on both sides of the fingers, draw the sampling outline, and cut it with scissors as the sample; The sample wear photos in the relevant information are photos of the sample wear taken under the same lighting and the same shooting angle.
[0026] Take the left-hand gloves with 13 genuine HA-AKORE liner A5, ultra-fine foaming on the palm, and reinforced dipping of the tiger's mouth as an example of the gloves to be tested, and conduct finger wear resistance test. The specific test method includes the following steps: To take samples, cut the corresponding part of the fingers from the pure liner on the back of the glove, press the 2.5cm*7cm acrylic sampling plate on the five fingers near the fingertips, avoiding the joint seams on both sides of the fingers, draw the sampling outline with a fluorescent pen, and cut it with scissors as the sample, and use weights (such as 1kg weights) or other heavy objects to press the five samples separately for 5 minutes; Fix, arrange the 5 pressed samples in order from thumb to pinky (thumb, index finger, middle finger, ring finger, pinky), stick double-sided tape on both sides of the cardboard, stick the back of the cardboard to the sample board, stick the arranged samples on the cardboard in order, and then put the sample board flat on the test platform, make sure that the five samples are placed under the corresponding grinding head (satisfy the condition that the grinding head can move 5cm on the corresponding sample, because the grinding head scrapes back and forth parallelly, one reciprocating is one cycle / circle, the speed is generally 80mm / S, the speed is also adjusted as needed, the adjustable speed is 10-200mm / S, and the grinding head moves 5cm in one direction), and use the fixture to reinforce the four feet of the sample board to prevent slippage during the test; Put down the 6N weight and the grinding head, so that the grinding head is placed on the test surface of the corresponding sample; Turn on the power of the finger wear test device, and set parameters on the operating device (such as a touch screen connected to the main control machine), including the experimental moving speed, moving distance, and the number of turns in a cycle, such as: the experimental moving speed is 60 mm / s, the moving distance is 50 mm, and the number of turns in a cycle is 10; Test, finger wear test device starts working; During the test, observe whether the sample is exposed. If the sample is exposed, the corresponding weight is lifted, the corresponding test ends, and the corresponding test of other samples continues; Record relevant information, including photos of sample wear and the number of circles of the sample exposed when the five grinding heads correspond to the sample. The wear photos are photos of the sample wear taken under the same lighting and the same shooting angle.
[0027] During the test, as the number of wear laps increases, the rubber layer on the finger surface becomes thinner, and the wear-resistant rubber scraps also begin to increase gradually. The size, shape and number of rubber scraps need to be observed. The composition and organization of rubber scraps can be used as a basis for inferring the wear process that has occurred and judging the severity of wear. As the number of wear laps increases, the rubber scraps also increase. It is necessary to use a vacuum cleaner to clean the rubber scraps on the surface of the sample in time. Failure to clean in time may affect the accuracy of the test data. Record the wear data during the wear process and take photos to observe the wear state. As the number of wear laps increases, the rubber surface will wrinkle in the test. The wrinkled part will crack as the grinding head scrapes back and forth, and then the cracks will gradually become larger, and finally the grinding head will directly scrape it up to expose the bottom. Some samples are scraped up directly by the grinding head during the test, and a piece of the rubber layer is torn off, revealing a large piece of the liner. In some tests, the thickness of the rubber layer is reduced little by little as the grinding head scrapes. At first, a liner the size of a sesame seed appears. As the number of wear laps increases, these small spots become more and more, and the rubber layer becomes thinner and thinner.
[0028] The friction state of fingers of different dipped gloves was observed, and the phenomenon of abrasion resistance was as follows: Figure 4 and Figure 5 The following are divided into two categories: one is a ( Figure 4 ) shows that the wear-resistant rubber layer is firmly bonded to the inner liner during the wear-resistant process, and the rubber surface is relatively flat. During the wear-resistant process, the rubber scraps are ground into powder. As the number of wear-resistant circles increases, the thickness of the rubber layer gradually decreases, and the inner liner is exposed evenly. The other type is b ( Figure 5 ) As shown in the figure, the rubber layer and the inner liner are not firmly bonded during the wear process, and the rubber surface is uneven. During the friction process, the rubber surface is scraped back and forth by the grinding head, and the rubber surface wrinkles and cracks. In a short time, the rubber layer is scraped off by the grinding head and separated from the inner liner. The exposed inner liner is single.
[0029] In the same batch of 13-gauge HA-AKORE liner A5, ultra-fine foaming on the palm, and reinforced dipping gloves for scraping the tiger's mouth, 10 left hands were selected for finger wear resistance test. The above test method was used for testing, and the ten groups of wear circle data were measured, as shown in Table 6 below.
[0030] Table 6 Wear-resistant circle data During the use of dipped rubber gloves, when the rubber layer is worn out and the liner is exposed, it means that the gloves cannot be used any more, and there is a potential risk of hand injury to the user. This shows that the minimum value is the value that needs to be paid special attention to during the test. According to the content shown in Table 6, the minimum wear resistance value mainly occurs on the index finger, followed by the ring finger, indicating that most of the ultra-fine foamed left-hand dipped rubber gloves used in this experiment will first have the rubber layer damaged and the liner exposed on the index finger.
[0031] The above undisclosed matters can all be implemented using existing technologies, and therefore will not be elaborated here.
[0032] For ordinary technicians, several similar variations and improvements can be made without departing from the creative concept of the present invention, and these should also be regarded as the protection scope of the present invention.
Claims
1. A finger wear resistance testing device, characterized in that: The scraping assembly includes a shaft, a weight and a grinding head. The grinding head includes a triangular prism-shaped head and a connecting part. One side of the head is connected to the connecting part. The connecting part is cylindrical and has a thread on its outer surface.
2. The finger wear resistance testing device according to claim 1, wherein: The head is a regular triangular prism, and the angle a between the other two sides of the head is 90°; A transition section is provided between the head and the connecting portion, and the transition section is coaxially arranged with the connecting portion; A connection between two side surfaces on the head that are not connected to the connection portion is chamfered to form an auxiliary plane at the connection.
3. The finger wear resistance testing device according to claim 1, wherein: The grinding heads are symmetrically distributed about the center line in the left-right direction and the front-back direction.
4. The finger wear resistance testing device according to claim 1, wherein: The connecting part is provided with a nut and a washer matched with the connecting part, and the nut is connected to the connecting part through a thread.
5. The finger wear resistance testing device according to claim 1, characterized in that: The scraping assembly includes five shafts and five weights, the weights are arranged in one-to-one correspondence with the shafts, the weights are rotatably connected to the corresponding shafts, and a grinding head is installed at the bottom of each shaft; The finger wear test device also includes a sample plate arranged corresponding to the scratching component and a fixture for fixing the sample plate.
6. The finger wear resistance testing device according to claim 5, characterized in that: The clamp is a movable clamp; The finger wear test device also includes a cardboard, one end surface of the cardboard is used to stick the sample to be tested for wear, and the other end surface of the cardboard is stuck on the sample plate; The cardboard is formed by pasting a plurality of cardboards.
7. The finger wear resistance testing device according to claim 6, characterized in that: The cardboard is made of three pieces of cardboard glued together.
8. A method for testing finger wear resistance, characterized in that: The finger wear resistance test method uses the finger wear resistance test device according to claim 6 or 7, and the finger wear resistance test method specifically includes the following steps: Take samples by cutting the corresponding parts of the fingers from the pure liner on the back of the glove, and take samples from the corresponding parts of the five fingers; Fix, stick the sample to the corresponding cardboard, stick the cardboard to the sample board, then place the five samples on the sample board under the five grinding heads respectively, and fix the sample board with a clamp; Put down the weight and the grinding head, so that the grinding head is placed on the test surface of the corresponding sample; Set parameters, including experimental moving speed, moving distance, and number of turns in a cycle; Test, finger wear test device starts working; If the bottom of the sample is exposed, the corresponding weight is lifted, the corresponding test ends, and the corresponding tests of other samples continue; Record relevant information, including photos of sample wear and the number of circles when the sample is exposed at the bottom corresponding to the five grinding heads.
9. The finger wear resistance testing method according to claim 8, characterized in that: The specific process of sampling is as follows: cut the corresponding part of the finger from the pure liner on the back of the glove, press the sampling plate on the five fingers near the fingertips avoiding the joint seams on both sides of the fingers, draw the sampling outline, and cut it with scissors as the sample; The sample wear photos in the relevant information are photos of the sample wear taken under the same lighting and the same shooting angle.
10. The finger wear resistance testing method according to claim 9, characterized in that: The size of the sampling plate is 2.5cm*7cm; During the fixing process, the sample plate needs to be fixed so that the grinding head can move 5cm on the corresponding sample; The set parameters are: experimental moving speed is 60㎜ / s, moving distance is 50㎜, and the number of circles in one cycle is 200.