A mesh stretch testing fixture

Abstract

The utility model relates to a kind of mesh cloth stretch test tool, including base, the top of the base is fixedly connected with rack, the top of the rack is vertically provided with lifting mechanism, the movable platform of the lifting mechanism is fixedly connected with mounting seat, the bottom of the mounting seat is fixedly connected with upper fixed seat, the bottom of the rack is provided with lower fixed seat, the lower fixed seat is set to the directly below of upper fixed seat, the upper fixed seat and lower fixed seat are symmetrically arranged in the form of "U", the inside of the upper fixed seat and lower fixed seat is evenly provided with clamping mechanism, the outside wall of the upper fixed seat and lower fixed seat is evenly provided with positioning mechanism, the top of the upper fixed seat is provided with top groove. The utility model has beneficial effects, by being provided with positioning mechanism, the clamping position of the sample to be tested can be adjusted, so that the position of the two ends of sample is kept in the middle, avoid sample from being deflected when stretching test, affect test result.

Description

Technical Field

[0001] This utility model relates to the field of mesh fabric testing technology, specifically to a mesh fabric tensile testing fixture. Background Technology

[0002] Fiberglass mesh is a material made primarily of glass fiber, woven using a special process and coated with a special coating. It possesses properties such as high strength, alkali resistance, crack resistance, corrosion resistance, fire resistance, thermal insulation, and sound insulation, and is widely used in construction, industry, and other fields. During production, fiberglass mesh undergoes a tensile test to determine its tensile strength.

[0003] For example, CN214622040U discloses a novel fixture for tensile testing of mesh fabric, including a fixed pressure plate and a movable pressure plate arranged opposite each other. The fixed pressure plate is universally connected to a butt joint. Anti-slip liners are provided on the opposing surfaces of both the fixed and movable pressure plates. The movable pressure plate can move closer to or further away from the fixed pressure plate under the drive of an external force perpendicular to its surface. During the test, this novel fixture for tensile testing of mesh fabric ensures that the central axis of the specimen is aligned with the direction of force through universal adjustment, preventing the fracture caused by shear force from failing to meet standard requirements. The anti-slip liners increase friction with the specimen, preventing the specimen from slipping during the test.

[0004] However, the aforementioned fixtures cannot guarantee that the clamping positions at both ends of the test sample are in the middle of the fixture. The sample is prone to skewing during tensile testing, which affects the test results. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing tensile testing fixtures tend to skew the test sample during tensile testing, thus affecting the test results.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A tensile testing fixture for a mesh fabric includes a base, a frame fixedly connected to the top of the base, a lifting mechanism vertically mounted on the top of the frame, a mounting base fixedly connected to the movable platform of the lifting mechanism, an upper fixed base fixedly connected to the bottom of the mounting base, and a lower fixed base mounted on the bottom of the frame, directly below the upper fixed base. The upper and lower fixed bases are arranged symmetrically in a "U" shape. Clamping mechanisms are provided on the inner sides of both the upper and lower fixed bases, and positioning mechanisms are provided on the outer walls of both the upper and lower fixed bases. A top groove is formed on the top of the upper fixed base. The positioning mechanism includes a transmission gear rotatably connected to the middle of the side walls of the upper and lower fixed bases. A pair of racks are meshed on the upper and lower sides of the transmission gear, and the pair of racks are diagonally arranged around the axis of the transmission gear. The racks are slidably connected to the side walls of the upper and lower fixed bases.

[0008] Furthermore, each of the two racks is fixedly connected to a positioning rod at the end away from the transmission gear. The other end of the positioning rod of the upper positioning mechanism extends to the top of the upper fixed seat, and the two positioning rods of the upper positioning mechanism are located on both sides of the top groove. The other end of the positioning rod of the lower positioning mechanism extends to the top of the lower clamping mechanism.

[0009] Furthermore, a pair of limiting blocks are symmetrically arranged on both sides of the upper and lower fixed seats facing the transmission gear.

[0010] Furthermore, the clamping mechanism includes a fixed clamping plate, which is fixedly connected to the inner sidewalls of the upper fixed seat and the lower fixed seat. A movable clamping plate is slidably connected to the inner side of the upper fixed seat and the lower fixed seat away from the fixed clamping plate. A screw is rotatably connected to the sidewall of the movable clamping plate away from the fixed clamping plate. The other end of the screw passes through the sidewall of the upper fixed seat and the lower fixed seat and is threadedly connected to it.

[0011] Furthermore, a handle is fixedly connected to the end of the screw away from the moving clamp.

[0012] Furthermore, the fixed clamping plate and the moving clamping plate are provided with several locking teeth that engage with each other on their opposite sidewalls.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The mesh fabric tensile testing fixture of this utility model is equipped with a positioning mechanism, which can adjust the clamping position of the test sample to keep both ends of the sample centered, so as to avoid the sample from tilting during the tensile test and affecting the test results.

[0015] 2. The mesh fabric tensile testing fixture of this utility model, by setting a fixed clamping plate, a movable clamping plate and a locking tooth, can improve the clamping effect of the test sample and prevent the test sample from slipping during stretching. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a mesh fabric tensile testing fixture according to the present invention;

[0017] Figure 2 This is a rear view structural schematic diagram of a mesh fabric tensile testing fixture according to the present invention;

[0018] Figure 3 This is an enlarged schematic diagram of section A of the mesh fabric tensile testing fixture of this utility model;

[0019] Figure 4 This is a schematic diagram of the clamping mechanism of a mesh fabric tensile testing fixture according to the present invention.

[0020] Reference numerals in the attached drawings: 1. Base; 2. Frame; 3. Lifting mechanism; 4. Mounting seat; 5. Upper fixed seat; 6. Lower fixed seat; 7. Positioning mechanism; 701. Transmission gear; 702. Rack; 703. Positioning rod; 704. Limiting block; 8. Clamping mechanism; 801. Fixed clamping plate; 802. Moving clamping plate; 803. Screw; 804. Handle; 805. Clamping tooth; 9. Top groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0022] refer to Figure 1-3The mesh fabric tensile testing fixture of this embodiment includes a base 1, a frame 2 fixedly connected to the top of the base 1, a lifting mechanism 3 vertically arranged on the top of the frame 2 for tensile testing of the sample, a mounting base 4 fixedly connected to the movable platform of the lifting mechanism 3, an upper fixed base 5 fixedly connected to the bottom of the mounting base 4, a lower fixed base 6 arranged at the bottom of the frame 2, the lower fixed base 6 being located directly below the upper fixed base 5, the upper fixed base 5 and the lower fixed base 6 being arranged symmetrically in a "U" shape, a clamping mechanism 8 being provided on the inner side of both the upper fixed base 5 and the lower fixed base 6 for clamping both ends of the sample, a positioning mechanism 7 being provided on the outer side wall of both the upper fixed base 5 and the lower fixed base 6 for adjusting the position of the sample during clamping, a top groove 9 being provided on the top of the upper fixed base 5, and the positioning mechanism 7 including a transmission gear. 701, the transmission gear 701 is rotatably connected to the middle of the side wall of the upper fixed seat 5 and the lower fixed seat 6. A pair of racks 702 are meshed on the upper and lower sides of the transmission gear 701. The pair of racks 702 are diagonally arranged around the axis of the transmission gear 701. The racks 702 are slidably connected to the side wall of the upper fixed seat 5 and the lower fixed seat 6. The end of each rack 702 away from the transmission gear 701 is fixedly connected to a positioning rod 703. The other end of the positioning rod 703 of the upper positioning mechanism 7 extends to the top of the upper fixed seat 5. The two positioning rods 703 of the upper positioning mechanism 7 are located on both sides of the top groove 9. The other end of the positioning rod 703 of the lower positioning mechanism 7 extends to the top of the lower clamping mechanism 8. A pair of limiting blocks 704 are symmetrically arranged on both sides of the side wall of the upper fixed seat 5 and the lower fixed seat 6 facing the transmission gear 701. During testing, first, the spacing between the positioning rods 703 of the upper positioning mechanism 7 is adjusted to be the same as the width of the sample to be tested. Then, the bottom end of the sample to be tested is placed in the lower fixed seat 6. The position of the bottom end of the sample to be tested is adjusted by the lower positioning mechanism 7. During positioning, the sample to be tested is positioned between the positioning rods 703. At this time, the positioning rods 703 are moved towards the transmission gear 701, causing the rack 702 connected to it to move. When the rack 702 moves, it drives the transmission gear 701 to start rotating. When the transmission gear 701 rotates, it drives the rack 702 connected to it on the other side to move in the opposite direction, so that the positioning rods 703 on both sides move synchronously towards each other until... The positioning rods 703 on both sides stop when they contact the two sides of the sample to be tested. At this time, the sample to be tested is in the middle of the clamping mechanism 8, thus positioning the sample to be tested. Then, the bottom end of the sample to be tested is clamped and fixed by the lower clamping mechanism 8. After fixing, the top end of the sample to be tested is inserted into the clamping mechanism 8 inside the upper fixed seat 6, so that the top end of the sample passes through the top groove 9. At this time, the sample is straightened along the two upper positioning rods 703, so that the top end of the sample to be tested is in the middle of the upper clamping mechanism 8. Then, the top end of the sample to be tested is clamped and fixed by the upper clamping mechanism 8. Finally, the lifting mechanism 3 drives the mounting seat 4 and the upper fixed seat 5 to move upward, so as to perform a tensile test on the sample to be tested.

[0023] refer to Figure 4 The clamping mechanism 8 includes a fixed clamping plate 801, which is fixedly connected to the inner sidewalls of the upper fixed seat 5 and the lower fixed seat 6. A movable clamping plate 802 is slidably connected to the side of the upper fixed seat 5 and the lower fixed seat 6 away from the fixed clamping plate 801. A screw 803 is rotatably connected to the sidewall of the movable clamping plate 802 away from the fixed clamping plate 801. The other end of the screw 803 passes through the sidewall of the upper fixed seat 5 and the lower fixed seat 6 and is threadedly connected to it. A handle 804 is fixedly connected to the end of the screw 803 away from the movable clamping plate 802. Several locking teeth 805 are provided for meshing between the opposing sidewalls of the fixed clamping plate 801 and the movable clamping plate 802. When clamping, rotate the handle 804, causing the screw 803 to rotate accordingly. When the screw 803 rotates, it moves to the inside of the upper fixed seat 5 and the lower fixed seat 6, driving the movable clamping plate 802 connected to its other end to move towards the fixed clamping plate 801, until several teeth 805 between the opposing side walls of the fixed clamping plate 801 and the movable clamping plate 802 mesh with each other, clamping and fixing the test sample between the fixed clamping plate 801 and the movable clamping plate 802 to prevent it from slipping during the tensile test.

[0024] Working principle: During testing, firstly, the spacing of the positioning rods 703 of the upper positioning mechanism 7 is adjusted to be the same as the width of the sample to be tested. Then, the bottom end of the sample to be tested is placed in the lower fixed seat 6. The position of the bottom end of the sample to be tested is adjusted by the lower positioning mechanism 7. During positioning, the sample to be tested is located between the positioning rods 703. At this time, the positioning rods 703 are moved towards the transmission gear 701, causing the rack 702 connected to it to move. When the rack 702 moves, it drives the transmission gear 701 to start rotating. When the transmission gear 701 rotates, it drives the rack 702 connected to it on the other side to move in the opposite direction, so that the positioning rods 703 on both sides move synchronously towards each other until the positioning rods 703 on both sides contact the two sides of the sample to be tested. At this time, the sample to be tested is in the middle of the clamping mechanism 8, realizing the positioning of the sample to be tested. Then, the bottom end of the sample to be tested is clamped and fixed by the lower clamping mechanism 8. When clamped, the sample to be tested is located between the fixed clamping plate 801 and the movable clamping plate 802. Turning the handle 804 causes the screw 803 to rotate. When the screw 803 rotates, it moves to the inside of the downward fixed seat 6, causing the movable clamping plate 802 connected to its other end to move towards the fixed clamping plate 801 until several teeth 805 between the opposing side walls of the fixed clamping plate 801 and the movable clamping plate 802 mesh with each other, clamping and fixing the bottom end of the sample to be tested between the fixed clamping plate 801 and the movable clamping plate 802. Then, the top end of the sample to be tested is inserted into the clamping mechanism 8 inside the upper fixed seat 6, so that the top end of the sample passes through the top groove 9. At this time, the sample is straightened along the two upper positioning rods 703, so that the top end of the sample to be tested is in the middle of the upper clamping mechanism 8. Then, the top end of the sample to be tested is clamped and fixed by the upper clamping mechanism 8. The clamping process is the same as above. Finally, the lifting mechanism 3 drives the mounting seat 4 and the upper fixed seat 5 to move upward, and the sample to be tested is subjected to tensile testing.

[0025] The above embodiments are used to further illustrate the present invention, but do not limit the present invention to these specific embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be understood as being within the protection scope of the present invention.

Claims

1. A tensile testing fixture for mesh fabric, characterized in that: The system includes a base (1), a frame (2) fixedly connected to the top of the base (1), a lifting mechanism (3) vertically arranged on the top of the frame (2), a mounting base (4) fixedly connected to the movable platform of the lifting mechanism (3), an upper fixed base (5) fixedly connected to the bottom of the mounting base (4), a lower fixed base (6) arranged at the bottom of the frame (2), the lower fixed base (6) being located directly below the upper fixed base (5), the upper fixed base (5) and the lower fixed base (6) being arranged symmetrically in a "U" shape, and a clamping mechanism (8) being provided on the inner side of both the upper fixed base (5) and the lower fixed base (6). The outer walls of the upper fixed seat (5) and the lower fixed seat (6) are provided with positioning mechanisms (7). The top of the upper fixed seat (5) is provided with a top groove (9). The positioning mechanism (7) includes a transmission gear (701). The transmission gear (701) is rotatably connected to the middle of the side walls of the upper fixed seat (5) and the lower fixed seat (6). A pair of racks (702) are meshed on the upper and lower sides of the transmission gear (701). The pair of racks (702) are diagonally arranged around the axis of the transmission gear (701). The racks (702) are slidably connected to the side walls of the upper fixed seat (5) and the lower fixed seat (6).

2. The mesh fabric tensile testing fixture according to claim 1, characterized in that: Both racks (702) are fixedly connected to a positioning rod (703) at one end away from the transmission gear (701). The other end of the positioning rod (703) of the upper positioning mechanism (7) extends to the top of the upper fixed seat (5), and the two positioning rods (703) of the upper positioning mechanism (7) are located on both sides of the top groove (9). The other end of the positioning rod (703) of the lower positioning mechanism (7) extends to the top of the lower clamping mechanism (8).

3. The mesh fabric tensile testing fixture according to claim 1, characterized in that: The upper fixed seat (5) and the lower fixed seat (6) are symmetrically provided with a pair of limiting blocks (704) on both sides of the side wall facing the transmission gear (701).

4. The mesh fabric tensile testing fixture according to claim 1, characterized in that: The clamping mechanism (8) includes a fixed clamping plate (801), which is fixedly connected to the inner sidewalls of the upper fixed seat (5) and the lower fixed seat (6). A movable clamping plate (802) is slidably connected to the side of the upper fixed seat (5) and the lower fixed seat (6) away from the fixed clamping plate (801). A screw (803) is rotatably connected to the sidewall of the movable clamping plate (802) away from the fixed clamping plate (801). The other end of the screw (803) passes through the sidewall of the upper fixed seat (5) and the lower fixed seat (6) and is threadedly connected to them.

5. The mesh fabric tensile testing fixture according to claim 4, characterized in that: A handle (804) is fixedly connected to the end of the screw (803) away from the moving clamp (802).

6. The mesh fabric tensile testing fixture according to claim 4, characterized in that: The fixed clamping plate (801) and the movable clamping plate (802) are provided with a number of locking teeth (805) that engage with each other on their opposite sidewalls.

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