A tensile strength detection device for leather production

Abstract

This invention discloses a tensile strength testing device for leather production, belonging to the field of tensile testing technology. The device includes a testing platform with a base plate fixedly mounted on it. A hollow column and a component box are fixedly mounted on the base plate. A guide movement mechanism is installed inside the hollow column. The device also includes at least one pair of clamps. One side of the hollow column has a long groove and a short groove, and a support member is slidably installed in both the long and short grooves. The clamps are mounted on the support members. The support member in the long groove is mounted on the guide movement mechanism, and a tension spring is fixedly connected between the support member in the short groove and the bottom surface of the groove. Contact points and microswitches are respectively installed on the support member and the bottom surface of the short groove. The two clamps are synchronously stretched by the same guide movement mechanism. When either sample breaks, the microswitch of the broken sample is triggered, the fracture information is recorded, and tension continues to be applied to the other sample until it breaks.

Description

Technical Field

[0001] This invention relates to the field of tensile testing technology, and more particularly to a tensile strength testing device for leather production. Background Technology

[0002] Leather is a key material widely used in footwear, bags, clothing and automotive interiors. Its mechanical properties directly affect the quality and service life of the finished products. Among them, tensile strength, as an important indicator of leather's ability to withstand external forces, is one of the key parameters for evaluating the quality of leather.

[0003] In existing technologies, the tensile strength test of leather is usually carried out using a general-purpose tensile testing machine with fixtures. This often means that only one sample can be tested at a time, and it is impossible to test and compare multiple samples simultaneously under the same experimental conditions. This not only increases the experimental time and cost, but may also lead to errors caused by differences in environmental conditions, affecting the comparability and reliability of the results. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that multiple samples cannot be tested and compared simultaneously under the same experimental conditions, and to propose a tensile strength testing device for leather production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A tensile strength testing device for leather production includes a testing platform with a base plate fixedly mounted on it. Hollow columns are fixedly mounted on the base plate, and the hollow columns are symmetrically arranged. A component box is installed at the end of each hollow column away from the base plate. A guiding and moving mechanism is installed inside each hollow column. The device also includes at least one pair of clamps for fixing the leather sample to be tested. One side of each hollow column has a long groove and a short groove. Support members are slidably mounted in both the long and short grooves, and the clamps are mounted on the support members. The support member located in the long groove is mounted on the guiding and moving mechanism. A tension spring is fixedly connected between the support member located in the short groove and the bottom surface of the short groove. A contact and a micro switch are respectively installed on the bottom surfaces of the support member and the short groove.

[0007] In order to ensure that if one sample breaks, the other can still be subjected to tension until it breaks, preferably, the clamps near the testing table are two independent clamps, left and right, which can be used to install the leather sample to be tested respectively, and the left and right clamps are slidably connected.

[0008] To further guide the leather sample to be evenly wound on the clamping plate and reduce edge breakage caused by excessive local pressure, the clamp includes a limiting block slidably installed in the support member, the limiting block having an installation channel, and a clamping plate located between the symmetrical limiting blocks. Rotating shafts are fixedly installed on both sides of the clamping plate, and the rotating shafts are coaxially installed in the installation channel and extend through the installation channel; wherein a handwheel is fixedly installed at one end of the rotating shaft outside the limiting block.

[0009] To ensure that the clamping plate remains centered without external force, the limiting block is further provided with a first mounting groove coaxially arranged with the mounting channel. A positioning ring is fixedly mounted on the rotating shaft, and a first spring is fixedly connected between the positioning ring and the inner sidewall of the first mounting groove.

[0010] To further enable the push rod to be pushed and drive the clamping arm to clamp the leather, an adjusting ring is rotatably mounted on the side of the limiting block away from the clamping plate. The adjusting ring is threaded onto the rotating shaft. A second mounting groove coaxially arranged with the mounting channel is opened in the limiting block. A connecting seat is fixedly mounted on the outer wall of the limiting block. A clamping arm is rotatably mounted in the connecting seat. A push rod is rotatably mounted on the clamping arm. The end of the push rod away from the clamping arm extends into the second mounting groove. A wedge block is fixedly mounted on the rotating shaft. The wedge block abuts against the inclined surface of the push rod.

[0011] To provide axial elastic support and ensure that the positioning pin can automatically reset and maintain the locked state of the clamping arm, the limiting block is further provided with a third mounting groove, in which the positioning pin is slidably installed, and a second spring is fixedly connected between the positioning pin and the bottom surface of the third mounting groove.

[0012] To provide elastic restoring force when the clamping plate opens and closes, and to prevent excessive clamping force from damaging the sample, the clamping plate further includes circular plates at both ends, a lower plate fixedly installed between the two circular plates, and an upper plate slidably installed between the two circular plates, forming a clamping cavity between the lower plate and the upper plate; wherein, both ends of the opposite surfaces of the lower plate and the upper plate are provided with receiving grooves, and a third spring is fixedly connected between the receiving grooves.

[0013] To provide flexible clamping pressure, especially suitable for clamping soft, thin or irregularly shaped leather samples, an airbag is fixedly installed on the side of the lower plate near the upper plate. An airflow channel communicating with the airbag is opened in the lower plate, and a valve is installed in the airflow channel.

[0014] To achieve precise tension control of the fixture, preferably, the guiding movement mechanism includes a guide rod fixedly installed in the hollow column on one side and a lead screw rotatably installed in the hollow column on the other side. A motor is fixedly installed in the component box, and the output end of the motor is connected to the lead screw for transmission.

[0015] To record the puncture parameters of the leather, a tensioning clamp is slidably mounted on the component box to tension the leather to be tested; the tensioning clamp has a through circular groove, which is symmetrically arranged; a constraint channel is provided on the component box; and a loading head is fixedly mounted on the circular plate. The circular groove, the constraint channel, and the loading head are coaxially arranged.

[0016] Compared with the prior art, the present invention provides a tensile strength testing device for leather production, which has the following advantages:

[0017] 1. This tensile strength testing device for leather production, when testing a single sample of leather, clamps one end of the leather sample between two independent clamps below, merging the two independent clamps into a unified clamping interface. The upper clamp is driven upward by a guide moving mechanism to achieve tensile loading. During loading, the lower clamp moves a certain distance within the short groove until it abuts against the inner wall of the short groove. When the sample breaks, the lower clamp quickly slides down due to loss of tension, triggering a microswitch, thereby automatically recording the breaking time, tensile force value, and elongation. When testing two samples of leather, two leather samples from different batches or with different processes can be clamped in two independent clamps respectively. The same set of guide moving mechanisms drives the two clamps to be stretched synchronously. When either sample breaks, the microswitch of the broken sample is triggered, recording the breaking information, and the tensile force continues to be applied to the other sample until it breaks. Whether for single leather sample or dual sample comparative testing, this device can provide good clamping stability and data acquisition capabilities.

[0018] 2. This tensile strength testing device for leather production places the leather sample to be tested into the clamping cavity formed by the lower plate and the upper plate. The upper plate is pressed down on the sample by the elastic force of the third spring. The air valve is opened to inflate the air bladder, causing it to expand and adhere to the sample surface, thus increasing the clamping friction. The air valve is closed to keep the air bladder under pressure. The third spring in the clamping cavity can automatically adjust the distance between the upper and lower plates according to the sample thickness. The air bladder expands and deforms according to the sample shape to achieve uniform contact and prevent stress concentration. For thicker or harder samples, the air bladder pressure can be reduced to avoid over-clamping. For thinner or softer samples, the air bladder pressure can be increased to enhance clamping stability.

[0019] 3. This tensile strength testing device for leather production involves cutting the leather to be tested into an appropriate size and placing it between the circular grooves in the middle of the tensioning clamp. The tensioning clamp is adjusted to ensure that the leather sample is under uniform tension. The guide moving mechanism is then activated, and the motor drives the lead screw to rotate. The circular plate moves the loading head upward along the constraint channel. The loading head gradually approaches and eventually punctures the leather sample under tension. During the test, the resistance change curve experienced by the loading head is recorded in real time, and key parameters such as the maximum puncture force, puncture energy, and puncture depth are automatically identified. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a tensile strength testing device for leather production proposed in this invention;

[0021] Figure 2 This is a schematic diagram of the installation structure of the guide moving mechanism of the tensile strength testing device for leather production proposed in this invention;

[0022] Figure 3 This is a schematic diagram of the upper clamp structure of a tensile strength testing device for leather production proposed in this invention;

[0023] Figure 4 This is a schematic diagram of the lower clamp structure of a tensile strength testing device for leather production proposed in this invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the limiting block of a tensile strength testing device for leather production proposed in this invention;

[0025] Figure 6 This is a schematic diagram of the clamping plate structure of a tensile strength testing device for leather production proposed in this invention;

[0026] Figure 7 This is a schematic diagram of a microswitch structure for a tensile strength testing device for leather production proposed in this invention;

[0027] Figure 8 This is a schematic diagram of the tensioning clamp structure of a tensile strength testing device for leather production proposed in this invention.

[0028] In the diagram: 1. Testing platform; 2. Base plate;

[0029] 3. Hollow column; 301. Long groove; 302. Short groove;

[0030] 4. Component box; 401. Constraint channel;

[0031] 5. Guide moving mechanism; 501. Guide rod; 502. Lead screw; 503. Motor;

[0032] 6. Fixture; 601. Limiting block; 6011. Mounting channel; 6012. First mounting slot; 6013. Second mounting slot; 6014. Third mounting slot; 602. Clamping plate; 6021. Circular plate; 6022. Lower plate; 6023. Upper plate; 6024. Receiving slot; 6025. Third spring; 6026. Airflow channel; 603. Rotating shaft; 604. Handwheel; 605. Positioning ring; 606. First spring; 607. Adjusting ring; 608. Connecting seat; 609. Clamping arm; 610. Push rod; 611. Wedge block; 612. Positioning pin; 613. Second spring; 614. Airbag;

[0033] 10. Support component; 7. Tension spring; 8. Contact; 9. Micro switch;

[0034] 11. Tensioning clamp; 1101. Circular groove;

[0035] 12. Load header. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Example 1:

[0039] Reference Figure 1-8 A tensile strength testing device for leather production includes a testing platform 1, a base plate 2 fixedly mounted on the testing platform 1, hollow columns 3 fixedly mounted on the base plate 2, the hollow columns 3 being symmetrically arranged, and a component box 4 being installed at the end of the hollow columns 3 away from the base plate 2. A guide moving mechanism 5 is installed inside the hollow columns 3. It also includes at least one pair of clamps 6 for fixing the leather samples to be tested. There are three clamps 6. Specifically, the clamps 6 on the side closer to the testing platform 1 are two independent clamps on the left and right, which can respectively hold the leather samples to be tested. The left and right clamps 6 are slidably connected to achieve simultaneous testing of two samples.

[0040] The guide moving mechanism 5 is used to drive the clamp 6 to perform uniform stretching operation and control the stretching speed and displacement accuracy. Specifically, the guide moving mechanism 5 includes a guide rod 501 fixedly installed in the hollow column 3 on one side and a lead screw 502 rotatably installed in the hollow column 3 on the other side. A motor 503 is fixedly installed in the component box 4. The output end of the motor 503 is connected to the lead screw 502 for transmission. When working, the motor 503 drives the lead screw 502 to rotate, which drives the slider connected to it by threads to move, thereby realizing the precise stretching control of the clamp 6.

[0041] Specifically, one side of the hollow column 3 is provided with a long groove 301 and a short groove 302, which are collinear. Support members 10 are slidably installed in both the long groove 301 and the short groove 302, and the clamp 6 is installed on the support member 10.

[0042] Specifically, the support member 10 located in the long groove 301 is mounted on the guide moving mechanism 5 and is driven by the motor 503. A tension spring 7 is fixedly connected between the support member 10 located in the short groove 302 and the bottom surface of the short groove 302 to provide a restoring force. A contact 8 and a micro switch 9 are respectively installed on the bottom surface of the support member 10 and the short groove 302. When the clamp 6 suddenly slides down after the sample breaks, the micro switch 9 is triggered to form a breakage signal feedback, which is used to automatically record the breakage time, tensile force value and elongation.

[0043] This invention provides a tensile strength testing device for leather production. When testing a single sample of leather, the total length of the sample is approximately 200 mm, the gauge length is approximately 25 mm, and the width is approximately 15-22 mm. One end of the leather sample is clamped between two independent clamps 6 below, so that the two independent clamps 6 are combined into a unified clamping interface. The upper clamp 6 is driven upward by the guide moving mechanism 5 to achieve tensile loading. During the loading process, the lower clamp 6 will move a certain distance within the short groove 302 until it abuts against the inner wall of the short groove 302. When the sample breaks, the lower clamp 6 will quickly slide down due to the loss of tension, triggering the micro switch 9, thereby automatically recording the breaking time, tensile force value, and elongation.

[0044] When testing leather samples with two samples, the total sample length is about 200mm, the gauge length is about 25mm, and the width is about 8-12mm. Two leather samples from different batches or with different processes can be clamped in two independent clamps 6. The two clamps 6 are stretched synchronously by the same set of guiding and moving mechanisms 5. When either sample breaks, the micro switch 9 of the broken sample is triggered, the breakage information is recorded, and the tension is continued to be applied to the other sample until it breaks.

[0045] Whether for single leather samples or dual-sample comparative testing, this device provides excellent clamping stability and data acquisition capabilities.

[0046] Example 2:

[0047] The tensile strength testing device provided in Example 1 was further optimized, with reference to... Figure 3 and Figure 5 The clamp 6 includes a limiting block 601 that is slidably installed in the support member 10. The limiting block 601 has an installation channel 6011 and a clamping plate 602 located between the symmetrical limiting blocks 601. A rotating shaft 603 is fixedly installed on both sides of the clamping plate 602. The rotating shaft 603 is coaxially installed in the installation channel 6011 and extends through the installation channel 6011.

[0048] Specifically, a handwheel 604 is fixedly installed at one end of the rotating shaft 603 outside the limiting block 601.

[0049] With the above structure, one end of the leather is clamped in the clamping plate 602. By rotating the handwheels 604 at both ends, the leather sample is guided to be evenly wrapped around the clamping plate 602. The rotation action causes the leather sample and the clamping plate 602 to have multi-point contact and entanglement effect, which increases the effective clamping area, prevents the sample from slipping, and reduces the edge breakage caused by excessive local pressure.

[0050] Referring to the figure, a first mounting groove 6012 is provided in the limiting block 601 and is coaxially arranged with the mounting channel 6011. A positioning ring 605 is fixedly installed on the rotating shaft 603. A first spring 606 is fixedly connected between the positioning ring 605 and the inner side wall of the first mounting groove 6012.

[0051] With the above structure, the first springs 606 on both sides work together to keep the clamping plate 602 in the center position without external force. Even during multiple clamping processes, the clamping plate 602 can quickly return to the initial position, which is convenient for subsequent operations.

[0052] Referring to the figure, an adjusting ring 607 is rotatably mounted on the side of the limiting block 601 away from the clamping plate 602. The adjusting ring 607 is threaded onto the rotating shaft 603. The position of the limiting block 601 can be finely adjusted by rotating the adjusting ring 607. A second mounting groove 6013 is provided in the limiting block 601, which is coaxially arranged with the mounting channel 6011. A connecting seat 608 is fixedly mounted on the outer wall of the limiting block 601. A clamping arm 609 is rotatably mounted in the connecting seat 608. A push rod 610 is rotatably mounted on the clamping arm 609. The end of the push rod 610 away from the clamping arm 609 extends into the second mounting groove 6013. A wedge block 611 is fixedly mounted on the rotating shaft 603. The wedge block 611 abuts against the inclined surface of the push rod 610.

[0053] Furthermore, a third mounting groove 6014 is provided on the limiting block 601, and a positioning pin 612 is slidably installed in the third mounting groove 6014. A second spring 613 is fixedly connected between the positioning pin 612 and the bottom surface of the groove of the third mounting groove 6014 to provide axial elastic support force, ensuring that the positioning pin 612 can automatically reset and maintain the locked state of the clamping arm 609.

[0054] With the above structure, the adjusting rings 607 on both sides rotate and press the limiting block 601 inward, so that the limiting block 601 moves within the support member 10. When the push rod 610 abuts against the wedge block 611 on the rotating shaft 603, the push rod 610 is pushed and drives the clamping arm 609 to perform a clamping operation on the leather.

[0055] Example 3:

[0056] The tensile strength testing device provided in Example 2 was further optimized, with reference to Figure 6 The clamping plate 602 includes circular plates 6021 located at both ends, a lower plate 6022 fixedly installed between the two circular plates 6021, and an upper plate 6023 slidably installed between the two circular plates 6021. The surface is provided with anti-slip texture or flexible covering layer. A clamping cavity is formed between the lower plate 6022 and the upper plate 6023 to accommodate the leather sample to be tested.

[0057] Specifically, both ends of the opposite surfaces of the lower plate 6022 and the upper plate 6023 are provided with receiving grooves 6024, and a third spring 6025 is fixedly connected between the relative receiving grooves 6024 to provide elastic restoring force when the clamping plate 602 opens and closes, so as to prevent the sample from being damaged due to excessive clamping force.

[0058] Furthermore, an airbag 614 is fixedly installed on the side of the lower plate 6022 near the upper plate 6023 to provide flexible clamping pressure, which is particularly suitable for clamping soft, thin or irregularly shaped leather samples. An airflow channel 6026 communicating with the airbag 614 is opened in the lower plate 6022 to deliver compressed air or release gas to the airbag 614. A valve is installed in the airflow channel 6026 to control the inflation and deflation of the airbag 614.

[0059] With the above structure, the leather sample to be tested is placed in the clamping cavity formed by the lower plate 6022 and the upper plate 6023. The upper plate 6023 is pressed down on the sample by the elastic force of the third spring 6025. The air valve is opened to inflate the air bladder 614, causing it to expand and adhere to the sample surface, thus enhancing the clamping friction. The air valve is closed to keep the air bladder 614 under pressure. The third spring 6025 in the clamping cavity can automatically adjust the distance between the upper and lower plates according to the sample thickness. The air bladder 614 expands and deforms according to the sample shape to achieve uniform contact and prevent stress concentration. For thicker or harder samples, the pressure of the air bladder 614 can be reduced to avoid over-clamping. For thinner or softer samples, the pressure of the air bladder 614 can be increased to enhance clamping stability.

[0060] Example 4:

[0061] The tensile strength testing device provided in the above embodiments is further optimized, referring to... Figure 1 and Figure 8 A tensioning clamp 11 is slidably mounted on the component box 4 for tensioning the leather to be tested. A circular groove 1101 is provided on the tensioning clamp 11, which is symmetrically arranged. A constraint channel 401 is provided on the component box 4. A loading head 12 is fixedly mounted on the circular plate 6021. The constraint channel 401 is used to limit the movement trajectory of the loading head 12 to ensure that it moves along a preset path. The circular groove 1101, the constraint channel 401 and the loading head 12 are coaxially arranged to ensure that the direction of force transmission is accurate.

[0062] With the above structure, the leather to be tested is cut to an appropriate size and placed between the circular grooves 1101 in the middle of the tensioning clamp 11. The tensioning clamp 11 is adjusted so that the leather sample is in a uniform tension state. The guide moving mechanism 5 is started, and the motor 503 drives the lead screw 502 to rotate. The circular plate 6021 drives the loading head 12 to move upward along the constraint channel 401. The loading head 12 gradually approaches and finally punctures the leather sample in the tension state. During the test, the resistance change curve of the loading head 12 is recorded in real time, and key parameters such as the maximum puncture force, puncture energy, and puncture depth are automatically identified.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tensile strength testing device for leather production, comprising a testing table (1), characterized in that, A base plate (2) is fixedly installed on the testing platform (1), and hollow columns (3) are fixedly installed on the base plate (2). The hollow columns (3) are symmetrically arranged, and a component box (4) is installed at one end of each hollow column (3) away from the base plate (2). A guide moving mechanism (5) is installed inside each hollow column (3). At least one pair of clamps (6) are used to fix the leather sample to be tested; Among them, a long groove (301) and a short groove (302) are provided on one side of the hollow column (3), and a support member (10) is slidably installed in both the long groove (301) and the short groove (302), and a clamp (6) is installed on the support member (10); Among them, the support member (10) located in the long groove (301) is installed on the guide moving mechanism (5), and the support member (10) located in the short groove (302) is fixedly connected to the bottom surface of the short groove (302) with a tension spring (7). The support member (10) and the bottom surface of the short groove (302) are respectively equipped with a contact (8) and a micro switch (9). The clamps (6) on the side near the testing table (1) are two independent clamps (6) on the left and right, which can be used to install the leather sample to be tested respectively, and the left and right clamps (6) are slidably connected; The clamp (6) includes a limiting block (601) slidably mounted within the support member (10), and the limiting block (601) has an installation channel (6011) therein. A clamping plate (602) is located between the symmetrical limiting blocks (601). Rotating shafts (603) are fixedly installed on both sides of the clamping plate (602). The rotating shafts (603) are coaxially installed in the installation channel (6011) and pass through the installation channel (6011). A handwheel (604) is fixedly installed at one end of the rotating shaft (603) outside the limiting block (601).

2. The tensile strength testing device for leather production according to claim 1, characterized in that, The limiting block (601) has a first mounting groove (6012) coaxially arranged with the mounting channel (6011). A positioning ring (605) is fixedly installed on the rotating shaft (603). A first spring (606) is fixedly connected between the positioning ring (605) and the inner sidewall of the first mounting groove (6012).

3. The tensile strength testing device for leather production according to claim 2, characterized in that, An adjusting ring (607) is rotatably mounted on the side of the limiting block (601) away from the clamping plate (602). The adjusting ring (607) is threaded onto the rotating shaft (603). A second mounting groove (6013) coaxially arranged with the mounting channel (6011) is opened in the limiting block (601). A connecting seat (608) is fixedly mounted on the outer wall of the limiting block (601). A clamping arm (609) is rotatably mounted in the connecting seat (608). A push rod (610) is rotatably mounted on the clamping arm (609). One end of the push rod (610) away from the clamping arm (609) extends into the second mounting groove (6013). A wedge block (611) is fixedly mounted on the rotating shaft (603). The wedge block (611) abuts against the inclined surface of the push rod (610).

4. The tensile strength testing device for leather production according to claim 3, characterized in that, The limiting block (601) has a third mounting groove (6014), and a positioning pin (612) is slidably installed in the third mounting groove (6014). A second spring (613) is fixedly connected between the positioning pin (612) and the bottom surface of the third mounting groove (6014).

5. The tensile strength testing device for leather production according to claim 1, characterized in that, The clamping plate (602) includes circular plates (6021) located at both ends, and a lower plate (6022) is fixedly installed between the two circular plates (6021). An upper plate (6023) is slidably installed between the two circular plates (6021) at both ends, and a clamping cavity is formed between the lower plate (6022) and the upper plate (6023); The lower plate (6022) and the upper plate (6023) are provided with receiving grooves (6024) at both ends of their opposite surfaces, and a third spring (6025) is fixedly connected between the receiving grooves (6024).

6. The tensile strength testing device for leather production according to claim 5, characterized in that, An airbag (614) is fixedly installed on the side of the lower plate (6022) near the upper plate (6023). An airflow channel (6026) communicating with the airbag (614) is opened in the lower plate (6022), and a valve is installed in the airflow channel (6026).

7. The tensile strength testing device for leather production according to claim 1, characterized in that, The guiding moving mechanism (5) includes a guide rod (501) fixedly installed inside the hollow column (3) on one side, and Rotate the lead screw (502) installed in the hollow column (3) on the other side, and fix the motor (503) in the component box (4). The output end of the motor (503) is connected to the lead screw (502) for transmission.

8. The tensile strength testing device for leather production according to claim 5, characterized in that, A tensioning clamp (11) is slidably installed on the component box (4) for tensioning the leather to be tested; The tensioning clamp (11) has a through circular groove (1101) that runs from front to back. The circular groove (1101) is symmetrically arranged. The component box (4) has a constraint channel (401). The circular plate (6021) is fixedly installed with a loading head (12). The circular groove (1101), the constraint channel (401) and the loading head (12) are coaxially arranged.

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