Tool for testing shearing strength of magic tape

Abstract

The utility model relates to the technical field of testing tools, and discloses a magic tape shearing strength testing tool which comprises a shearing testing bottom plate, a linear module and a fixing plate are installed on the upper surface of the shearing testing bottom plate, and a stepping motor used for driving the linear module to do linear motion is installed at the end of the linear module. The upper surface of the linear module moving part is provided with an adapter plate through a bolt, and the side wall of the adapter plate is provided with a single-axis force sensor through a bolt. According to the utility model, the two fixed clamping blocks are matched with the movable clamping block to respectively clamp the two ends of the two sticking tapes which are stuck together, and the stepping motor is used for driving the linear module to enable one of the fixed clamping block and the movable clamping block to move, so that horizontal pulling force is applied to one ends of the sticking tapes which are stuck together; the single-shaft force sensor is used for measuring the tensile force of the shearing strength of the hook and loop fastener, the overall structure is simple, use is convenient, the occupied area is small, manufacturing cost is low, and practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of testing tools, in particular to a tool for testing the shear strength of a hook and loop fastener. Background Art

[0002] Velcro fasteners are widely used in products such as transportation vehicles, sports equipment, medical equipment, travel bags, clothing decoration, sanitary ware, health care equipment, etc., and are developing rapidly and have a huge industrial chain. It has male and female sides, one side is the male side with soft fibers, and the other side is the female side with hook-barbed elastic fibers. The male and female sides are interlocked, and when subjected to a certain lateral force, the elastic hook is straightened, loosened from the velvet loop and opened, and then the original hook shape is restored, and it can be opened and closed repeatedly. During the Velcro production process, the shear strength of the Velcro needs to be tested to ensure that it meets the standards.

[0003] The existing technical solution for testing the shear strength of Velcro mainly uses a CRE type tensile testing machine to stretch the Velcro loop. The tensile testing machine needs to be used with a clamp to fix the Velcro. At the same time, the Velcro needs to be fixed to a certain extent. One end holds the loop surface tape, and the other end holds the hook surface tape. The tensile testing machine is used to uniformly stretch the Velcro to record the maximum tension, and then the shear strength of the Velcro is calculated. However, the CRE type tensile testing machine is used to test the shear strength of the Velcro, the machine cost is high, occupies a large space, and is inconvenient to install. Therefore, a Velcro shear strength testing tool is proposed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a hook and loop fastener shear strength testing tool, which is convenient for testing the shear strength of the hook and loop fastener.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a kind of shear strength testing tool for Velcro, comprising a shear testing base plate, a linear module and a fixed plate are installed on the upper surface of the shear testing base plate, a stepping motor for driving the linear module to perform linear motion is installed on the end of the linear module, an adapter plate is installed on the upper surface of the moving part of the linear module by bolts, a uniaxial force sensor is installed on the side wall of the adapter plate by bolts, a fixed clamp is installed on the adjacent surfaces of the uniaxial force sensor and the fixed plate by bolts, the end face of the fixed clamp is L-shaped structure, a locking bolt is passed through the upper surface of the fixed clamp, a movable clamp is threadedly connected to the lower end of the locking bolt, a limiting unit located between the two fixed clamps is installed on the upper surface of the shear testing base plate, and the limiting unit limits the Velcro.

[0006] Preferably, there are two locking bolts on the upper surface of the fixing clamp block, and the two locking bolts are distributed at both ends of the upper surface of the fixing clamp block.

[0007] Preferably, the movable clamp includes two threaded sleeves respectively threadedly connected to the two locking bolts and an adjusting clamp, the upper surface of the adjusting clamp is penetrated by two sliding grooves, the two threaded sleeves are respectively slidably connected in the two sliding grooves, the inner walls on both sides of the sliding grooves are provided with multiple limit grooves, and the outer walls on both sides of the threaded sleeves are fixedly connected with multiple groups of sliding rods respectively slidably connected to the multiple limit grooves.

[0008] Preferably, the movable clamp block also includes a plurality of adjustment rods fixedly connected to both ends of the adjustment clamp block, and adjustment plates are installed on both sides of the fixed clamp block by bolts. The adjustment plates are provided with a plurality of inclined holes, and the adjustment rods are slidably connected in the inclined holes.

[0009] Preferably, a guide fillet is provided at a bend in the inner wall of the fixed clamping block.

[0010] Preferably, a plurality of waist-shaped holes are formed through the side wall of the fixing plate, and bolts for fixing the fixing clamp block pass through the waist-shaped holes to be connected with the fixing clamp block.

[0011] Preferably, the limiting unit comprises a bracket installed on the upper surface of the shear test base plate by bolts, a first limiting plate is installed on the upper surface of the bracket by bolts, a second limiting plate is installed on the upper surface of the first limiting plate by bolts, and adjacent surfaces of the first limiting plate and the second limiting plate are provided with slots.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model clamps the two ends of two Velcro tapes bonded together by two fixed clamps and a movable clamp, and uses a progressive motor to drive a linear module to move one of the fixed clamps and the movable clamp, thereby applying a horizontal pulling force to one end of the Velcro tapes bonded together, and a single-axis force sensor measures the tensile force of the shear strength of the Velcro tapes. The overall structure is simple, easy to use, occupies a small area, has a low manufacturing cost, and improves practicality.

[0014] 2. The utility model installs a limit unit on the shear test base plate, and the limit unit limits the Velcro, thereby improving the stability of the Velcro stretching process. The Velcro pattern is not easy to jump, which helps to improve the accuracy of measuring force.

[0015] 3. The Velcro in the utility model is clamped in an L-shape between the fixed clamping block and the adjustable clamping block, which improves the clamping strength of the Velcro and ensures that the Velcro will not slip out of the clamping position when the Velcro is pulled, thereby further improving the accuracy of the measurement.

[0016] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the matching structure of the fixed clamping block, the movable clamping block and the limiting unit of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the movable clamp of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the movable clamping block of the utility model;

[0021] Figure 5 This is a structural schematic diagram of the installation method of the fixed plate to the fixed clamp block of the utility model;

[0022] Figure 6 This is a sample diagram of the shear strength test state of the Velcro of the utility model.

[0023] In the figure: 1. Shear test base plate; 2. Linear module; 3. Stepper motor; 4. Adapter plate; 5. Fixed plate; 6. Single-axis force sensor; 7. Fixed clamp; 8. Movable clamp; 81. Threaded sleeve; 82. Adjustment clamp; 83. Slide groove; 84. Limiting groove; 85. Slide rod; 86. Adjustment rod; 9. Limiting unit; 91. Bracket; 92. First limiting plate; 93. Second limiting plate; 94. Slot; 10. Adjustment plate; 11. Oblique hole; 12. Locking bolt; 13. Waist-shaped hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this technical field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-6The hook and loop fastener shear strength testing tool of this embodiment includes a shear testing base plate 1, a linear module 2 and a fixed plate 5 are installed on the upper surface of the shear testing base plate 1, a stepping motor 3 for driving the linear module 2 to perform linear motion is installed on the end of the linear module 2, an adapter plate 4 is installed on the upper surface of the moving part of the linear module 2 by bolts, a uniaxial force sensor 6 is installed on the side wall of the adapter plate 4 by bolts, and a fixed clamp 7 is installed on the adjacent surfaces of the uniaxial force sensor 6 and the fixed plate 5 by bolts, the end face of the fixed clamp 7 is an L-shaped structure, a locking bolt 12 is penetrated on the upper surface of the fixed clamp 7, and a movable clamp 8 is threadedly connected to the lower end of the locking bolt 12, and a limiting unit 9 located between the two fixed clamps 7 is installed on the upper surface of the shear testing base plate 1, and the limiting unit 9 limits the hook and loop fastener.

[0026] like Figure 1 , 2 As shown, the test fixture structure in the utility model is similar to the existing test fixture structure. The main improvement of the utility model is that when the shear strength of the Velcro needs to be tested, one end portion of the two male and female Velcro tapes are partially pasted and overlapped, and the end of the pasted Velcro tape is inserted between the fixed clamp block 7 and the movable clamp block 8. At this time, the locking bolt 12 is rotated, and the locking bolt 12 drives the movable clamp block 8 to rise, so that the movable clamp block 8 cooperates with the fixed clamp block 7 to clamp the end of the Velcro tape. After both ends of the Velcro tape are clamped, the stepper motor 3 is started to work, and the stepper motor 3 drives the linear module 2 to make a linear motion, thereby moving the adapter plate 4. The adapter plate 4 drives the fixed clamp block 7 connected thereto to move away from the other fixed clamp block 7 through the uniaxial force sensor 6. The other fixed clamp block 7 is supported by the fixed plate 5 and cooperates with the movable clamp block 8 to fix one end of the Velcro. The movable fixed clamp block 7 cooperates with the movable clamp block 8 to pull one end of the Velcro. The Velcro is subjected to horizontal force to perform a shear strength test. The uniaxial force sensor 6 measures the tensile force of the shear strength of the Velcro. The overall structure is simple, easy to use, small in area, low in manufacturing cost, and practicality is improved.

[0027] Among them, the stepper motor 3 mentioned above can be purchased on the market. It is a mature technology and has been fully disclosed, so it is not repeated in the specification. The stepper motor 3 is equipped with a power connection line, and it is electrically connected to the external main controller and 220V phase voltage (or 380V line voltage) through the power line, and the main controller can be a conventional known device such as a computer that plays a control role.

[0028] like Figure 2-4As shown, there are two locking bolts 12 on the upper surface of the fixed clamp block 7, and the two locking bolts 12 are distributed at both ends of the upper surface of the fixed clamp block 7; the two locking bolts 12 are used to enable the movable clamp block 8 to cooperate with the two sides of the fixed clamp block 7 to clamp and fix the end of the Velcro, so that the pressure in the width direction of the Velcro is more uniform, the force in the width direction is more balanced during stretching, and the test result is more accurate.

[0029] like Figure 3 , 4 As shown, the movable clamp 8 includes two threaded sleeves 81 and an adjusting clamp 82 that are respectively threadedly connected to the two locking bolts 12. Two sliding grooves 83 are provided on the upper surface of the adjusting clamp 82. The two threaded sleeves 81 are respectively slidably connected in the two sliding grooves 83. The inner walls on both sides of the sliding grooves 83 are provided with a plurality of limiting grooves 84. The outer walls on both sides of the threaded sleeve 81 are fixedly connected with a plurality of groups of sliding rods 85 that are respectively slidably connected to the plurality of limiting grooves 84; when the two locking bolts 12 are rotated, the threaded sleeve 81 is driven to rise or fall, and the sliding rods 85 on the outer wall of the threaded sleeve 81 cooperate with the limiting grooves 84 to drive the adjusting clamp 82 to rise or fall. The adjusting clamp 82 can slide on the outer wall of the threaded sleeve 81 by means of the sliding grooves 83. When the adjusting clamp 82 slides, the limiting grooves 84 are driven to slide on the outer wall of the sliding rod 85, thereby horizontally adjusting the position of the adjusting clamp 82 and the fixed clamp 7.

[0030] like Figure 2-4 As shown, the movable clamp block 8 also includes a plurality of adjustment rods 86 fixedly connected to the two ends of the adjustment clamp block 82. Adjustment plates 10 are installed on both sides of the fixed clamp block 7 by bolts. The adjustment plate 10 is provided with a plurality of inclined holes 11. The adjustment rods 86 are slidably connected in the inclined holes 11. When the adjustment clamp block 82 is driven to rise by rotating the locking bolt 12, the locking bolt 12 drives the threaded sleeve 81 to rise. The threaded sleeve 81 drives the adjustment clamp block 82 to rise through the sliding rod 85 and the limiting groove 84. The adjustment rod 86 at the end of the adjustment clamp block 82 slides in the inclined hole 11. , so that the slide groove 83 on the adjusting clamp block 82 slides on the outer wall of the threaded sleeve 81, and the limit groove 84 slides on the outer wall of the slide rod 85, so that the adjusting clamp block 82 is tilted upward, and the Velcro is bent from the upper surface of the adjusting clamp block 82 along the vertical side wall of the fixed clamp block 7 between the fixed clamp block 7 and the adjusting clamp block 82. The adjusting clamp block 82 that moves upward tilts clamps and fixes the vertical and horizontal ends of the Velcro, thereby improving the strength of clamping and fixing the Velcro, ensuring that the Velcro will not slip out of the clamping position when the Velcro is pulled, thereby further improving the accuracy of the measurement.

[0031] like Figure 3 As shown, a guide fillet is provided at the bend of the inner wall of the fixed clamp block 7 ; the guide fillet can be used for guidance, so that the Velcro can be easily passed to the vertical side wall of the fixed clamp block 7 .

[0032] like Figure 5As shown, a plurality of waist-shaped holes 13 are formed through the side wall of the fixing plate 5, and bolts for fixing the fixing clamp block 7 pass through the waist-shaped holes 13 to be connected to the fixing clamp block 7; the waist-shaped holes 13 can be used to adjust the height of the fixing clamp block 7 connected to the fixing plate 5, thereby ensuring that the Velcro is in a horizontal state when it is pulled, thereby ensuring that the Velcro is pulled in a horizontal state, thereby improving the accuracy of the measurement.

[0033] like Figure 1 , 2 As shown, the limit unit 9 includes a bracket 91 installed on the upper surface of the shear test base plate 1 by bolts, a first limit plate 92 is installed on the upper surface of the bracket 91 by bolts, a second limit plate 93 is installed on the upper surface of the first limit plate 92 by bolts, and adjacent surfaces of the first limit plate 92 and the second limit plate 93 are provided with slots 94; when the shear strength test of the Velcro is performed, the adhered Velcro is passed through the slot 94, the bracket 91 supports the first limit plate 92, and the second limit plate 93 cooperates with the first limit plate 92 to block the Velcro passed through the slot 94, thereby improving the stability of the Velcro stretching process, and the Velcro pattern is not easy to jump, which helps to improve the accuracy of the measurement force.

[0034] The implementation steps in this embodiment are as follows: when it is necessary to test the shear strength of the Velcro, one end portion of the two male and female Velcros are partially pasted and overlapped, and the pasted Velcro is first passed through the slot 94, the bracket 91 supports the first limit plate 92, and the second limit plate 93 cooperates with the first limit plate 92 to block the Velcro passed through the slot 94, and then the end of the Velcro is inserted between the fixed clamp block 7 and the adjusting clamp block 82, and the Velcro is bent from the upper surface of the adjusting clamp block 82 along the vertical side wall of the fixed clamp block 7 between the fixed clamp block 7 and the adjusting clamp block 82. At this time, the locking bolt 12 is rotated. When the locking bolt 12 drives the adjusting clamp block 82 to rise, the locking bolt 12 drives the threaded sleeve 81 to rise, and the threaded sleeve 81 drives the adjusting clamp block 82 to rise through the sliding rod 85 and the limit groove 84, and the adjusting rod 86 at the end of the adjusting clamp block 82 slides in the inclined hole 11 The adjusting clamp 82 moves so that the slide groove 83 on the adjusting clamp block 82 slides on the outer wall of the threaded sleeve 81, and the limit groove 84 slides on the outer wall of the slide rod 85, thereby making the adjusting clamp block 82 tilt upward. The adjusting clamp block 82 that moves tilt upward clamps and fixes the vertical and horizontal ends of the Velcro. After both ends of the Velcro are clamped, the stepper motor 3 is started to work, and the stepper motor 3 drives the linear module 2 to make a linear motion, thereby moving the adapter plate 4. The adapter plate 4 drives the fixed clamp block 7 connected to it away from the other fixed clamp block 7 through the uniaxial force sensor 6. The other fixed clamp block 7 fixes one end of the Velcro through the support of the fixed plate 5 and cooperates with the adjusting clamp block 82. The moving fixed clamp block 7 cooperates with the adjusting clamp block 82 to pull one end of the Velcro, and the Velcro is subjected to horizontal force for a shear strength test. The tensile force of the shear strength of the Velcro is measured by the uniaxial force sensor 6.

[0035] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A hook and loop fastener shear strength test tool, comprising a shear test base plate (1), characterized in that: A linear module (2) and a fixed plate (5) are installed on the upper surface of the shear test base plate (1); a stepper motor (3) for driving the linear module (2) to perform linear motion is installed at the end of the linear module (2); an adapter plate (4) is installed on the upper surface of the moving part of the linear module (2) by bolts; a uniaxial force sensor (6) is installed on the side wall of the adapter plate (4) by bolts; a fixed clamping block (7) is installed on the adjacent surfaces of the uniaxial force sensor (6) and the fixed plate (5) by bolts; the end surface of the fixed clamping block (7) is an L-shaped structure; a locking bolt (12) is penetrated through the upper surface of the fixed clamping block (7); a movable clamping block (8) is threadedly connected to the lower end of the locking bolt (12); a limiting unit (9) located between the two fixed clamping blocks (7) is installed on the upper surface of the shear test base plate (1); and the limiting unit (9) limits the Velcro tape.

2. A hook and loop fastener shear strength testing tool according to claim 1, characterized in that: There are two locking bolts (12) on the upper surface of the fixed clamp block (7), and the two locking bolts (12) are distributed at both ends of the upper surface of the fixed clamp block (7).

3. A hook and loop fastener shear strength testing tool according to claim 2, characterized in that: The movable clamp (8) comprises two threaded sleeves (81) respectively threadedly connected to two locking bolts (12) and an adjusting clamp (82); two slide grooves (83) are formed through the upper surface of the adjusting clamp (82); the two threaded sleeves (81) are respectively slidably connected in the two slide grooves (83); the inner walls on both sides of the slide grooves (83) are respectively provided with a plurality of limit grooves (84); the outer walls on both sides of the threaded sleeve (81) are respectively fixedly connected with a plurality of slide rods (85) slidably connected to the plurality of limit grooves (84).

4. A hook and loop fastener shear strength testing tool according to claim 3, characterized in that: The movable clamping block (8) also includes a plurality of adjustment rods (86) fixedly connected to both ends of the adjustment clamping block (82). Adjustment plates (10) are installed on both sides of the fixed clamping block (7) by bolts. The adjustment plate (10) is provided with a plurality of inclined holes (11), and the adjustment rods (86) are slidably connected in the inclined holes (11).

5. A hook and loop fastener shear strength testing tool according to claim 4, characterized in that: A guide fillet is provided at the inner wall bending portion of the fixed clamp block (7).

6. The hook and loop fastener shear strength testing tool according to claim 1, characterized in that: A plurality of waist-shaped holes (13) are formed through the side wall of the fixing plate (5), and bolts for fixing the fixing clamp block (7) pass through the waist-shaped holes (13) to be connected to the fixing clamp block (7).

7. The hook and loop fastener shear strength testing tool according to claim 1, characterized in that: The limiting unit (9) comprises a bracket (91) mounted on the upper surface of the shear test base plate (1) by means of bolts, a first limiting plate (92) is mounted on the upper surface of the bracket (91) by means of bolts, a second limiting plate (93) is mounted on the upper surface of the first limiting plate (92) by means of bolts, and adjacent surfaces of the first limiting plate (92) and the second limiting plate (93) are both provided with slots (94).

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