A plastic woven bag tensile test fixture

Abstract

The utility model discloses a kind of plastic braided bag tensile test clamps, including tensile testing machine, further include: fixed base plate, its top center is equipped with the connecting shaft for connecting tensile testing machine;Movable clamping plate;Guiding support mechanism, including two support shafts, support shaft is fixedly connected in the left and right sides of fixed base plate, the two sides of movable clamping plate are equipped with shaft hole, shaft hole is slidably matched with support shaft through linear bearing;Pressure regulating mechanism, including adjusting bolt and support plate, support plate is fixedly connected in the end of two support shafts, adjusting bolt passes through the screw hole in the center of support plate and is rotatably connected with the center of movable clamping plate through bearing;Anti-slip clamping component, including main anti-slip plate and vice anti-slip plate, and relative surface is equipped with anti-slip tooth array.The utility model can control clamping condition by bolt, can according to sample state and clamping condition, dynamic artificial control, solve the sample damage caused by excessive clamping force, can be clamped and not hurt sample, and further ensure the accuracy of detection result.

Description

Technical Field

[0001] This utility model belongs to the technical field of material performance testing equipment, specifically, it relates to a tensile testing fixture for plastic woven bags. Background Technology

[0002] Plastic woven bags are made primarily from polypropylene (PP) and polyethylene (PE) resins, with the addition of small amounts of auxiliary materials. The mixture is melted through an extruder, extruded into a plastic film, and cut into filaments. These filaments are then stretched at a temperature below the resin's melting point, and through molecular orientation and heat setting, high-strength, low-elongation flat filaments are produced. These filaments are then wound, woven, cut, and sewn to form plastic woven bags. Plastic woven bags offer advantages such as flatness, high tensile strength, convenient packaging, corrosion resistance, water resistance, mildew resistance, and ease of loading, unloading, stacking, handling, and storage. They are suitable for packaging powdery and granular products such as chemical raw materials, fertilizers, cement, food, and new building materials, as well as flexible products, and are currently the most widely used packaging product on the market.

[0003] In the production of woven bags, the relative breaking force of flat yarns is one of the key factors controlling the strength of the bags. It is also the quality indicator with the highest frequency of non-compliance in market quality inspections of plastic woven bags. To reduce costs, manufacturers indiscriminately add recycled materials and cheap filler masterbatches, resulting in a decrease in the tensile load (relative breaking force) of the plastic woven bags. With increasingly fierce competition in the industry, improving the tensile load of plastic woven bags has become a major competitive strategy. Controlling the relative breaking force of flat yarns mainly involves three aspects: raw material ratio, film cooling and forming, and the stretching of the flat yarns.

[0004] The existing tensile testing machines mainly use wedge jaws and electrically controlled flat-push jaws, neither of which can adapt the clamping force. Moreover, the clamping force is usually large, which can easily damage the plastic woven bag samples and further affect the accuracy of the test results. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide a tensile testing fixture for plastic woven bags, including a tensile testing machine, and further comprising:

[0006] A fixed base plate is provided with a connecting shaft at the top center for connecting to a tensile testing machine;

[0007] A movable clamp is arranged parallel to one side of the fixed base plate;

[0008] The guide support mechanism includes two parallel support shafts, which are vertically fixed to the left and right sides of the fixed base plate, respectively. The movable clamping plate has shaft holes on both sides, and the shaft holes are slidably engaged with the support shafts through linear bearings.

[0009] The pressure regulating mechanism includes an adjusting bolt and a support plate. The support plate is vertically fixed to the ends of two support shafts. The adjusting bolt passes through a threaded hole in the center of the support plate, and the front end of the adjusting bolt is rotatably connected to the center of the movable clamping plate through a bearing.

[0010] The anti-slip clamping assembly includes a main anti-slip plate and a secondary anti-slip plate that are detachably mounted on the opposite surfaces of a fixed base plate and a movable clamping plate, respectively, and the opposite surfaces of the main anti-slip plate and the secondary anti-slip plate are provided with an anti-slip tooth array.

[0011] As a preferred embodiment, in the anti-slip clamping assembly, the main anti-slip plate and the secondary anti-slip plate are detachably mounted on the fixed base plate and the movable clamping plate by magnetic adsorption, specifically as follows:

[0012] A magnetic plate is embedded on the opposite surfaces of the fixed base plate and the movable clamping plate;

[0013] Permanent magnets are embedded on the back of the main anti-slip plate and the secondary anti-slip plate.

[0014] As a preferred embodiment, the anti-slip tooth array consists of multiple quadrangular pyramidal teeth, with the top of each quadrangular pyramidal tooth being a flat surface.

[0015] As a preferred embodiment, a return spring is sleeved on the support shaft. The return spring is located between the movable clamping plate and the fixed base plate, and in its natural state, the return spring causes the movable clamping plate to move away from the fixed base plate.

[0016] As a preferred embodiment, a rotating handle is fixedly connected to the end of the adjusting bolt. The rotating handle has anti-slip texture, and a visual pressure indicator is provided at the outer end of the rotating handle. The pressure indicator includes a pointer fixed to the end of the adjusting bolt and an annular scale fixed to the support plate.

[0017] As a preferred embodiment, the sample positioning structure is also included, which includes a positioning baffle vertically disposed at the front edge of the fixed substrate, and the positioning baffle is provided with a slot.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention controls the clamping condition with bolts, allowing for dynamic manual control based on the sample's condition and clamping status. This solves the problem of sample damage caused by excessive clamping force, ensuring both proper clamping and sample protection, thereby guaranteeing the accuracy of test results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0021] Figure 2 This is a top view of the structure of this utility model. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] A tensile testing fixture for plastic woven bags includes a tensile testing machine and further includes:

[0024] A fixed base plate 1 is provided with a connecting shaft 11 for connecting a tensile testing machine at the top center;

[0025] The movable clamp 2 is arranged parallel to one side of the fixed base plate 1;

[0026] The guide support mechanism includes two parallel support shafts 3, which are vertically fixed to the left and right sides of the fixed base plate 1 respectively. The movable clamping plate 2 has shaft holes on both sides, and the shaft holes are slidably engaged with the support shafts 3 through linear bearings.

[0027] The pressure regulating mechanism includes an adjusting bolt 4 and a support plate 5. The support plate 5 is vertically fixed to the ends of two support shafts 3. The adjusting bolt 4 passes through the threaded hole in the center of the support plate 5, and the front end of the adjusting bolt 4 is rotatably connected to the center of the movable clamping plate 2 through a bearing 6.

[0028] The anti-slip clamping assembly includes a main anti-slip plate 7 and a secondary anti-slip plate 8 that are detachably mounted on the opposite surfaces of the fixed base plate 1 and the movable clamping plate 2, respectively. The opposite surfaces of the main anti-slip plate 7 and the secondary anti-slip plate 8 are provided with an anti-slip tooth array.

[0029] The plastic woven bag is placed between the fixed base plate 1 and the movable clamping plate 2. Then, the adjusting bolt is rotated to push the movable clamping plate 2 to move linearly along the support shaft 3. At this time, the anti-slip tooth array bites the plastic woven bag sample to the preset pressure value. Then, the tensile testing machine is started to begin the tensile test. The bearing 6 can eliminate the shear force of the rotating adjusting bolt 4 on the sample.

[0030] In a preferred embodiment, in the anti-slip clamping assembly, the main anti-slip plate 7 and the secondary anti-slip plate 8 are detachably mounted on the fixed base plate 1 and the movable clamping plate 2 by magnetic adsorption. Specifically:

[0031] A magnetic plate 9 is embedded on the opposite surfaces of the fixed base plate 1 and the movable clamping plate 2;

[0032] Permanent magnets 10 are embedded on the back of the main anti-slip plate 7 and the secondary anti-slip plate 8.

[0033] When replacing them, the old main anti-slip plate 7 and the secondary anti-slip plate 8 are pulled out horizontally. The new main anti-slip plate 7 and the secondary anti-slip plate 8 can be automatically attracted and positioned when they are close to the magnetic plate 9 on the fixed base plate 1 and the movable clamping plate 2. The operator only needs to push them to the limit position. Preferably, a dovetail groove can be used for the limit position.

[0034] In a preferred embodiment, the anti-slip tooth array consists of multiple quadrangular pyramidal teeth 81, with the top of each quadrangular pyramidal tooth 81 being a flat surface.

[0035] When placing the sample, the sample is brought into contact with the top plane of the four-sided pyramidal teeth 81. The tips of the teeth on the plane can disperse the pressure by increasing the contact area, thereby avoiding the limiting crushing.

[0036] In a preferred embodiment, a reset spring 13 is sleeved on the support shaft 3. The reset spring 13 is located between the movable clamping plate 2 and the fixed base plate 1, and the reset spring 13 keeps the movable clamping plate 2 away from the fixed base plate 1 in its natural state.

[0037] During operation, the adjusting bolt 4 is rotated in the opposite direction, so that the reset spring 13 can automatically spring open the movable clamping plate, and then the sample fragment will automatically fall off. Compared with manual separation, the efficiency is greatly improved. Preferably, the two ends of the reset spring 13 are fixed on the fixed base plate 1 and the movable clamping plate 2 respectively.

[0038] In a preferred embodiment, a rotating handle 14 is fixedly connected to the end of the adjusting bolt 4. The rotating handle 14 is provided with anti-slip texture, and a visual pressure indicator 15 is provided at the outer end of the rotating handle 14. The pressure indicator 15 includes a pointer 151 fixed to the end of the adjusting bolt 4 and an annular scale 152 fixed to the support plate 5.

[0039] When pressure needs to be applied, the pressure indicator 15 can be observed, specifically the pointer 151 pointing to the scale on the dial 152, to make a judgment, which can improve the accuracy of pressure control. Preferably, one revolution of the dial 152 can be 50N, and a scale line is set every 1N.

[0040] As a preferred embodiment, it also includes a sample positioning structure, which includes a positioning baffle 16 vertically disposed on the front edge of the fixed substrate 1. The positioning baffle 16 is provided with a slot 161. During operation, the sample is inserted into the slot 161 on the positioning baffle 16, and the bottom edge of the sample is aligned with the clamping center line. At this time, the anti-slip tooth array will evenly bite the full width of the sample, thereby eliminating the test deviation caused by sample offset.

[0041] The working process of this device is as follows:

[0042] 1. Pre-adjust the spacing of the movable clamps

[0043] The operator rotates the rotary handle 14 counterclockwise;

[0044] Adjusting bolt 4 is moved backward;

[0045] The reset spring 13 pushes the movable clamp 2 away from the fixed base plate 1.

[0046] Movable clamp 2 moves to its maximum spacing;

[0047] The pressure indicator 15 pointer returns to zero (no preload).

[0048] 2. Install the sample

[0049] The plastic woven bag sample is laid flat on the anti-slip plate 7 of the fixed base plate 1;

[0050] One end of the sample abuts against the bottom of the slot 161 of the positioning baffle 16;

[0051] Ensure the sample is centered in the width direction within the anti-slip tooth array area.

[0052] 3. Adjust the clamping force

[0053] Rotate the handle 14 clockwise;

[0054] Adjusting bolt 4 pushes bearing 6 forward;

[0055] The movable clamp 2 moves along the support shaft 3 toward the fixed base plate 1;

[0056] 4. Observe the pressure indicator dial 15:

[0057] Pointer 151 rotates relative to dial 152;

[0058] Stop rotating when the scale value reaches the target clamping force (e.g., 200N);

[0059] Anti-slip teeth 8 bite test specimen.

[0060] 5. Start the stretching program

[0061] Connect the connecting shaft 11 on the fixed base plate 1 to the tensile testing machine;

[0062] Start the tensile testing machine to begin the tensile test.

[0063] 6. Post-tensile test procedures

[0064] After the tensile test is completed, rotate the handle 14 counterclockwise to the limit.

[0065] The movable clamp 2 is completely away from the fixed base plate 1;

[0066] Remove the sample fragments.

[0067] If the anti-slip teeth 81 are worn, remove the main and auxiliary anti-slip plates and install new anti-slip plates.

[0068] The contents not described in detail in this specification are existing technologies known to those skilled in the art, and their specifications and models can be selected according to actual conditions.

[0069] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical embodiments described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stretch testing jig for plastic woven bags comprising a stretch testing machine, characterized in that, Also includes: A fixed base plate (1) is provided with a connecting shaft (11) for connecting a tensile testing machine at the top center. The movable clamp (2) is arranged parallel to one side of the fixed base plate (1); The guide support mechanism includes two parallel support shafts (3), which are vertically fixed to the left and right sides of the fixed base plate (1). The movable clamp (2) has shaft holes on both sides, and the shaft holes are slidably engaged with the support shafts (3) through linear bearings. The pressure regulating mechanism includes an adjusting bolt (4) and a support plate (5). The support plate (5) is vertically fixed to the ends of two support shafts (3). The adjusting bolt (4) passes through the threaded hole in the center of the support plate (5), and the front end of the adjusting bolt (4) is rotatably connected to the center of the movable clamping plate (2) through a bearing (6). The anti-slip clamping assembly includes a main anti-slip plate (7) and a secondary anti-slip plate (8) that are detachably mounted on the opposite surfaces of a fixed base plate (1) and a movable clamping plate (2), respectively. The opposite surfaces of the main anti-slip plate (7) and the secondary anti-slip plate (8) are provided with an anti-slip tooth array.

2. A stretch testing fixture for plastic woven bags as defined in claim 1, wherein In the anti-slip clamping assembly, the main anti-slip plate (7) and the secondary anti-slip plate (8) are detachably mounted on the fixed base plate (1) and the movable clamping plate (2) by magnetic adsorption, specifically: A magnetic plate (9) is embedded on the opposite surfaces of the fixed base plate (1) and the movable clamping plate (2). Permanent magnets (10) are embedded on the back of the main anti-slip plate (7) and the secondary anti-slip plate (8).

3. A stretch testing fixture for plastic woven bags as defined in claim 1, wherein The anti-slip tooth array consists of multiple quadrangular pyramidal teeth (81), with the top of each quadrangular pyramidal tooth (81) being a flat surface.

4. A stretch testing fixture for plastic woven bags as defined in claim 1, wherein A reset spring (13) is sleeved on the support shaft (3). The reset spring (13) is located between the movable clamp (2) and the fixed base plate (1), and the reset spring (13) in its natural state causes the movable clamp (2) to move away from the fixed base plate (1).

5. A stretch testing fixture for plastic woven bags as defined in claim 1 wherein, The end of the adjusting bolt (4) is fixedly connected to a rotating handle (14). The rotating handle (14) is provided with anti-slip texture, and the outer end of the rotating handle (14) is provided with a visual pressure indicator (15). The pressure indicator (15) includes a pointer (151) fixed to the end of the adjusting bolt (4) and an annular scale (152) fixed to the support plate (5).

6. A stretch testing fixture for plastic woven bags as defined in claim 1 wherein, It also includes a sample positioning structure, which includes a positioning baffle (16) vertically disposed on the front edge of the fixed substrate (1), and the positioning baffle (16) is provided with a slot (161).

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