A leather strength detection device

Abstract

The present invention relates to the technical field of testing the strength characteristics of solid materials by mechanical stress, and specifically relates to a leather strength detection device, which includes a box body and a detection mechanism. The detection mechanism includes a hydraulic cylinder. The upper end of the hydraulic cylinder is provided with a placement table for placing leather samples. A piston and a push rod are arranged inside the hydraulic cylinder. One end of the push rod is fixedly connected to the piston, and the other end extends out of the hydraulic cylinder and is used to pierce the leather sample on the placement table from bottom to top. The placement table includes a support cylinder coaxially arranged with the hydraulic cylinder. One side of the support cylinder is connected with a negative pressure adsorption system. After the leather sample is placed on the upper side of the support cylinder, the negative pressure adsorption system sucks the air in the support cylinder, so that the leather sample is adsorbed on the upper side of the support cylinder. After the leather sample is adsorbed on the upper side of the support cylinder, the pressing cover descends and presses the leather sample, so that the edge of the leather sample is clamped and fixed by the support cylinder and the pressing cover. The present invention can fix the leather sample flatly in the detection device and ensure the accuracy of the detection result.

Description

Technical Field

[0001] The invention relates to the technical field of testing the strength characteristics of solid materials by using mechanical stress, and in particular to a leather strength detection device. Background Art

[0002] Leather is made of natural protein fibers tightly woven in three-dimensional space. Its surface has a special grain layer with natural grain and luster, and feels comfortable. In order to ensure the quality of leather, each part of the leather needs to be tested before it is put on the market.

[0003] At present, when performing crack detection on leather, a small round leather sample is fixed in a leather crack tester, and then force is applied to the small leather sample until the leather sample breaks, and then the strength of the leather can be obtained by referring to the leather sample rupture time and the corresponding force magnitude. Leather crack testers in the prior art, such as a leather crack tester disclosed in a Chinese utility model patent with authorization announcement number CN204575439U, when fixing the leather sample, the round leather sample is placed in the leather crack tester by hand, and the leather sample is first fixed by hand, and then the leather crack tester is operated to clamp the edge position of the round leather sample. This method of first manually fixing the leather sample and then clamping the leather sample can easily cause the leather sample to be uneven after fixation, thereby affecting the test results. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a leather strength testing device to solve the technical problem in the prior art that the leather sample is prone to being uneven after being fixed, thus affecting the test structure.

[0005] A leather strength detection device of the present invention adopts the following technical solution:

[0006] A leather strength testing device comprises a box body and a testing mechanism arranged in the box body, the testing mechanism comprises a hydraulic cylinder whose axis extends in the up-down direction, the upper end of the hydraulic cylinder is provided with a placing table for placing leather samples, the hydraulic cylinder is provided with a piston and a push rod, the push rod is located on the central axis of a supporting tube, one end of the push rod is fixedly connected to the piston, and the other end extends out of the hydraulic cylinder, and is used to break the leather sample on the placing table from bottom to top, the placing table comprises a supporting tube coaxially arranged with the hydraulic cylinder, one side of the supporting tube is connected to a negative pressure adsorption system, the negative pressure adsorption system sucks the air in the supporting tube after the leather sample is placed on the upper side of the supporting tube, so that the leather sample is adsorbed on the upper side of the supporting tube, and the top of the box body is provided with a lifting and lowering downward pressure cover above the placing table, the downward pressure cover descends and presses down the leather sample after the leather sample is adsorbed on the upper side of the supporting tube, so that the edge of the leather sample is clamped and fixed by the supporting tube and the downward pressure cover.

[0007] Further, the support cylinder includes a straight cylinder coaxial with the hydraulic cylinder and a flange located at the upper end of the straight cylinder. A ring platform coaxial with the flange is provided on the upper end surface of the flange. The ring platform is used for supporting and cooperating with the edge of the leather sample. A plurality of central cylinders are coaxially nested in the support cylinder. The upper ends of the central cylinders are flush with the ring platform to support the center of the leather sample. An annular chamber is formed between the support cylinder and the outermost central cylinder and between adjacent two central cylinders respectively. Each annular chamber is communicated with the negative pressure adsorption system.

[0008] Further, a rolling mechanism is provided on the pressing cover. The rolling mechanism is used for stretching the leather sample along the radial direction of the leather sample to make the surface of the leather sample flat. The rolling mechanism includes a roller assembly floatingly installed in the pressing cover in the up-and-down direction. The roller assembly is connected with a driving mechanism. When the pressing cover descends, the roller assembly presses the edge of the leather sample. The driving mechanism drives the roller assembly to roll to stretch the leather sample along the radial direction of the leather sample.

[0009] Further, a flat pushing mechanism is provided in the flange. The flat pushing mechanism includes a wedge plate floatingly installed in the flange along the radial direction of the flange. One end of the wedge plate facing the center of the support cylinder is a tip. When the negative pressure adsorption system adsorbs the leather sample, the wedge plate extends along the radial direction of the flange and extends into the lower side of the leather sample. The wedge plate and the roller assembly jointly clamp the edge of the leather sample from the upper and lower sides of the leather sample. When the roller assembly rolls, the leather sample is subjected to a radial stretching force.

[0010] Further, a plurality of groups of the roller assemblies and the flat pushing mechanisms are respectively arranged at equal intervals along the circumferential direction of the support cylinder, and the roller assemblies and the flat pushing mechanisms are arranged in one-to-one correspondence. The roller assembly includes a bevel gear, an intermediate wheel and a pressing wheel arranged side by side. The bevel gear, the intermediate wheel and the pressing wheel are sequentially rotatably installed in the pressing cover from top to bottom. The axes of the bevel gear, the intermediate wheel and the pressing wheel of the same roller assembly are parallel and perpendicular to the radial direction of the support cylinder. The intermediate wheel and the pressing wheel are both friction wheels. When the pressing cover descends to make the roller assembly press the edge of the leather sample, the two axial ends of the bevel gear are respectively in frictional transmission connection with the outer peripheral surface of the intermediate wheel, and the outer peripheral surface of the intermediate wheel is in frictional transmission connection with the outer peripheral surface of the pressing wheel. The driving mechanism drives the bevel gear to rotate, so that the bevel gear drives the pressing wheel to rotate through the intermediate wheel.

[0011] Further, a return spring is respectively pressed between the helical gear and the intermediate gear, between the intermediate gear and the lower pressing wheel, and between the helical gear and the lower pressing cover of the same roller assembly. The helical gear, the intermediate gear, and the lower pressing wheel are respectively movably installed in the lower pressing cover in the up-and-down direction. The return spring spaces the helical gear, the intermediate gear, and the lower pressing wheel apart from each other in the initial state. A pressing ring is provided on the lower side of the lower pressing cover on the side close to the center of the roller assembly. The pressing ring is used to press the edge of the leather sample. In the initial state, the lower side of the lower pressing wheel is lower than the lower end of the pressing ring.

[0012] Further, a transmission gear ring coaxial with the lower pressing cover is rotatably provided in the lower pressing cover. Helical teeth meshing with the helical gears of the respective roller assemblies are provided on the outer periphery of the transmission gear ring. Internal teeth are provided on the inner periphery of the transmission gear ring. The drive mechanism has an output shaft, and a transmission gear is connected to the output shaft. The transmission gear meshes with the internal teeth of the transmission gear ring for transmission.

[0013] Further, a piston hole is formed in the inner wall of the support cylinder. A piston column is movably inserted into the piston hole. The piston column is fixedly connected to the wedge plate. A tension spring is connected to the end of the piston column facing away from the center of the support cylinder. The tension spring urges the wedge plate to retract radially into the flange.

[0014] Further, a guiding groove extending radially along the flange is formed on the upper side surface of the flange. A guiding block is provided on the wedge plate. The guiding block is located in the guiding groove to guide the wedge plate to move radially along the flange.

[0015] Further, an air pressure telescopic cylinder is connected to the upper side of the lower pressing cover. An L-shaped support arm is fixed to the top of the box body. The lower end of the air pressure telescopic cylinder is fixedly connected to the upper side of the lower pressing cover. The upper end of the air pressure telescopic cylinder is fixedly connected to the support arm.

[0016] The beneficial effects of the present invention are as follows: For a leather strength detection device of the present invention, by providing a negative pressure adsorption system, during use, first, the leather sample placed on the support cylinder is adsorbed and fixed by the negative pressure adsorption system, and then the edge of the leather sample is pressed by the lower pressing cover above. There is no need for manual fixation of the leather sample. Under the adsorption action of the negative pressure adsorption system, the entire leather sample receives uniform adsorption force, and it is easier to make the leather sample in a flat state.

[0017] Furthermore, the present invention is provided with a flat-pushing mechanism and a roller assembly. After the leather sample is adsorbed by the negative-pressure adsorption system, the edge of the leather sample is stretched and unfolded. After the pressing cover descends, the roller assembly presses on the upper side of the leather sample, and the wedge-shaped plate and the roller assembly jointly clamp the edge of the leather sample from the upper and lower sides of the leather sample, and then the roller assembly rolls, so that the leather sample is subjected to a tensile force acting radially outward, and then the edge of the leather sample is stretched in all directions, ensuring that the leather sample is in a flat state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0019] Figure 1 Stereoscopic schematic diagram of an embodiment of a leather strength detection device of the present invention;

[0020] Figure 2 Stereoscopic schematic diagram of the detection mechanism in an embodiment of a leather strength detection device of the present invention;

[0021] Figure 3 Cross-sectional schematic diagram of the detection mechanism in an embodiment of a leather strength detection device of the present invention;

[0022] Figure 4 For Figure 3 Enlarged view of the partial area A in

[0023] Figure 5 For Figure 3 Enlarged view of the partial area B in

[0024] Figure 6 Another cross-sectional schematic diagram of the detection mechanism in an embodiment of a leather strength detection device of the present invention;

[0025] Figure 7 For Figure 6 Enlarged view of the partial area C in

[0026] In the figure: 100, box body; 200, support arm; 300, detection mechanism; 310, hydraulic cylinder; 311, hydraulic oil port; 312, hydraulic chamber; 313, piston; 314, ejector rod; 315, radial communication hole; 316, central cylinder; 317, piston hole; 318, guide groove; 320, annular communication cover; 321, communication pipe; 330, pressing cover; 331, installation groove; 332, pressure ring; 333, lower pressing wheel; 334, intermediate wheel; 335, helical gear; 336, transmission gear ring; 340, pneumatic telescopic cylinder; 350, driving mechanism; 351, transmission gear; 360, leather sample; 370, piston column; 371, tension spring; 380, flat pushing mechanism; 381, guide block; 382, wedge plate. Specific implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] An embodiment of a leather strength detection device of the present invention is as Figures 1 to 7 shown. The leather strength detection device includes a box body 100 and a detection mechanism 300 arranged in the box body 100. A display screen and control buttons are provided on the box body 100. The structure of the box body 100 and the control buttons both belong to the prior art and will not be described in detail here. In the present invention, the detection mechanism 300 includes a hydraulic cylinder 310 whose axis extends in the up and down direction. The hydraulic cylinder 310 has a hydraulic chamber 312. A piston 313 and an ejector rod 314 are arranged in the hydraulic cylinder 310. The ejector rod 314 is located on the central axis of the support cylinder. One end of the ejector rod 314 is fixedly connected to the piston 313, and the other end extends out of the hydraulic cylinder 310. A hydraulic oil port 311 is provided at the lower end of the hydraulic cylinder 310. The hydraulic oil port 311 is connected to a hydraulic system arranged in the box body 100. By controlling the inflow and outflow of hydraulic oil, the piston 313 is driven to drive the ejector rod 314 to move up and down.

[0029] The upper end of the hydraulic cylinder 310 is provided with a placement table for placing the leather sample 360. The placement table includes a support cylinder coaxially arranged with the hydraulic cylinder 310. During use, the circular leather sample 360 is placed on the upper side of the support cylinder. One side of the support cylinder is connected with a negative pressure adsorption system (not shown in the figure). After the leather sample 360 is placed on the upper side of the support cylinder, the negative pressure adsorption system sucks the air in the support cylinder, so that the leather sample 360 is adsorbed on the upper side of the support cylinder. Above the support cylinder on the top of the box body 100, there is a downward pressing cover 330 that can be lifted and lowered. After the leather sample 360 is adsorbed on the upper side of the support cylinder, the downward pressing cover 330 descends and presses the leather sample 360, so that the edge of the leather sample 360 is clamped and fixed by the support cylinder and the downward pressing cover 330. After the leather sample 360 is clamped and fixed, control the piston 313 in the hydraulic cylinder 310 to drive the ejector rod 314 to move upward, and the upper end of the ejector rod 314 pierces the leather sample 360 upward to realize the bursting test of the leather sample 360.

[0030] In this embodiment, the support cylinder includes a straight cylinder coaxially arranged with the hydraulic cylinder 310 and a flange located at the upper end of the straight cylinder. On the upper end surface of the flange, there is a ring platform coaxially arranged with the flange. The outer diameter of the ring platform is adapted to the diameter of the circular leather sample 360. In this way, after the leather sample 360 is placed on the upper side of the support cylinder, the leather sample 360 is just located on the ring platform, and the ring platform is used for supporting and cooperating with the edge of the leather sample 360. To prevent the middle part of the leather sample 360 from collapsing downward, a plurality of central cylinders 316 are coaxially nested in the support cylinder. The upper ends of the central cylinders 316 are flush with the ring platform to support the middle part of the leather sample 360. In this embodiment, an annular chamber is respectively formed between the support cylinder and the outermost central cylinder 316 and between adjacent two central cylinders 316, and each annular chamber is respectively communicated with the negative pressure adsorption system. Specifically, a plurality of radial communication holes 315 are opened on the side wall of the straight cylinder of the support cylinder. One ends of the radial communication holes 315 are respectively communicated with each annular chamber. An annular communication cover 320 is arranged on the periphery of the support cylinder. The other ends of the radial communication holes 315 are communicated with the inside of the annular communication cover 320. The annular communication cover 320 is connected with the negative pressure adsorption system through a communication pipe 321. When the present invention is in use, first use the negative pressure adsorption system to adsorb and fix the leather sample 360 placed on the support cylinder, and then use the downward pressing cover 330 above to press the edge of the leather sample 360. There is no need for manual fixation of the leather sample 360. Under the adsorption action of the negative pressure adsorption system, the entire leather sample 360 receives uniform adsorption force, and it is easier to make the leather sample 360 in a flat state.

[0031] In this embodiment, a rolling mechanism is provided on the lower pressing cover 330. The rolling mechanism is used to radially stretch the leather sample 360 along the radial direction of the leather sample 360 to make the surface of the leather sample 360 flat. Specifically, the rolling mechanism includes a roller assembly floatingly installed in the lower pressing cover 330 in the up and down direction. The roller assembly is connected to a driving mechanism 350, and the driving mechanism 350 is a driving motor. When the lower pressing cover 330 descends, the roller assembly presses down the edge of the leather sample 360, and the driving mechanism 350 drives the roller assembly to roll to radially stretch the leather sample 360 along the radial direction of the leather sample 360. A flat pushing mechanism 380 is provided inside the flange. The flat pushing mechanism 380 is arranged corresponding to the rolling mechanism up and down. The flat pushing mechanism 380 and the roller assembly are used to clamp the edge of the leather sample 360 from the upper and lower sides of the leather sample 360. The flat pushing mechanism 380 includes a wedge-shaped plate 382 floatingly installed in the flange along the radial direction of the flange. One end of the wedge-shaped plate 382 facing the center of the support cylinder is a tip. When the negative pressure adsorption system adsorbs the leather sample 360, the wedge-shaped plate 382 extends along the radial direction of the flange and extends into the lower side of the leather sample 360. After the lower pressing cover 330 descends, the roller assembly presses on the upper side of the leather sample 360. The wedge-shaped plate 382 and the roller assembly jointly clamp the edge of the leather sample 360 from the upper and lower sides of the leather sample 360, and then the roller assembly is made to roll. As a result, the leather sample 360 is subjected to a radially outward tensile force, so that the edge of the leather sample 360 is stretched in all directions, ensuring that the leather sample 360 is in a flat state.

[0032] In this embodiment, multiple groups of the roller assembly and the horizontal pushing mechanism 380 are respectively arranged at equal intervals along the circumferential direction of the support cylinder, and the roller assembly and the horizontal pushing mechanism 380 are arranged in one-to-one correspondence in the vertical direction. The roller assembly includes a bevel gear 335, an intermediate gear 334, and a pressing wheel 333 arranged side by side. An installation cavity 331 is formed in the pressing cover 330. The bevel gear 335, the intermediate gear 334, and the pressing wheel 333 are sequentially and rotatably installed in the installation cavity 331 of the pressing cover 330 from top to bottom. The axes of the bevel gear 335, the intermediate gear 334, and the pressing wheel 333 of the same roller assembly are parallel and perpendicular to the radial direction of the support cylinder. Both the intermediate gear 334 and the pressing wheel 333 are friction wheels. When the pressing cover 330 descends to press the edge of the leather sample 360 by the roller assembly, the axial two ends of the bevel gear 335 are respectively in frictional driving connection with the outer peripheral surface of the intermediate gear 334, and the outer peripheral surface of the intermediate gear 334 is in frictional driving connection with the outer peripheral surface of the pressing wheel 333. The driving mechanism 350 drives the bevel gear 335 to rotate, so that the bevel gear 335 drives the pressing wheel 333 to rotate through the intermediate gear 334. A return spring is respectively pressed between the bevel gear 335 and the intermediate gear 334, between the intermediate gear 334 and the pressing wheel 333, and between the bevel gear 335 and the pressing cover 330 of the same roller assembly. The bevel gear 335, the intermediate gear 334, and the pressing wheel 333 are respectively movably installed in the pressing cover 330 in the vertical direction. The return spring makes the bevel gear 335, the intermediate gear 334, and the pressing wheel 333 be arranged at intervals from each other in the initial state. A pressing ring 332 is provided on the lower side of the pressing cover 330 on the side close to the center of the pressing cover 330 of the roller assembly. The pressing ring 332 is used to press the edge of the leather sample 360. In the initial state, the lower side of the pressing wheel 333 is lower than the lower end of the pressing ring 332. When the pressing cover 330 descends, the pressing wheel 333 contacts the leather sample 360 earlier than the pressing ring 332, and under the action of the return spring, the pressing wheel 333 and the leather sample 360 are elastically extruded, and as the pressing cover 330 descends, the pressing wheel 333, the intermediate gear 334, and the bevel gear 335 achieve two-by-two driving connection.

[0033] In this embodiment, a transmission gear ring 336 coaxial with the pressing cover 330 is rotatably provided in the pressing cover 330. The outer periphery of the transmission gear ring 336 is provided with helical teeth meshing and driving with the bevel gears 335 of each roller assembly. The inner periphery of the transmission gear ring 336 is provided with internal teeth. The driving mechanism 350 has an output shaft, and a transmission gear 351 is connected to the output shaft. The transmission gear 351 is in meshing transmission with the internal teeth of the transmission gear ring 336.

[0034] In this embodiment, the wedge plate 382 of the flat-pushing mechanism 380 is floatingly arranged within the flange. Specifically, a piston hole 317 is formed in the inner wall of the support cylinder, and a piston column 370 is movably inserted into the piston hole 317. The piston column 370 is fixedly connected to the wedge plate 382. A tension spring 371 is connected to the end of the piston column 370 departing from the center of the support cylinder. The tension spring 371 drives the wedge plate 382 to retract radially into the flange. When the negative-pressure adsorption system adsorbs the leather sample 360, under the action of negative pressure, the piston column 370 moves towards the center of the support cylinder due to the negative pressure, and then drives the wedge plate 382 to extend radially along the flange and extend into the lower side of the leather sample 360.

[0035] In this embodiment, a guiding groove 318 extending radially along the flange is formed on the upper side surface of the flange. A guiding block 381 is provided on the wedge plate 382, and the guiding block 381 is located within the guiding groove 318 to guide the wedge plate 382 to move radially along the flange. In this embodiment, the guiding block 381 is a strip-shaped block extending radially along the flange. One end of the guiding block 381 is fixedly connected to the wedge plate 382, and the other end is overhanging and is used for blocking and cooperating with the edge of the leather sample 360. When the wedge plate 382 drives the guiding block 381 to move towards the center of the support cylinder together, after the overhanging end of the guiding block 381 contacts the edge of the leather sample 360, due to the blocking action of the leather sample 360, the guiding block 381 will stop moving further towards the center of the support cylinder. In this way, when the leather sample 360 is in a wrinkled state, the edge of the leather sample 360 will partially contract towards the center of the support cylinder, and the moving distances of the wedge plates 382 at different positions towards the center of the support cylinder are different, resulting in different clamping forces between the roller assemblies at different positions and the wedge plates 382.

[0036] In this embodiment, a pneumatic telescopic cylinder 340 is connected to the upper side of the pressing cover 330. An L-shaped support arm 200 is fixed to the top of the box body 100. The lower end of the pneumatic telescopic cylinder 340 is fixedly connected to the upper side of the pressing cover 330, and the upper end of the pneumatic telescopic cylinder 340 is fixedly connected to the support arm 200. During use, the lifting of the pressing cover 330 is realized by controlling the telescopic movement of the pneumatic telescopic cylinder 340.

[0037] When the leather strength detection device of the present invention is in use, a leather sample 360 is placed in the annular platform at the upper end of the support cylinder. A plurality of central cylinders 316 support the leather sample 360 from the middle of the leather sample 360. Then, the negative pressure adsorption system is started to form a negative pressure inside each annular chamber, so that the lower side of the leather sample 360 is closely attached to the upper end of the annular platform and the central cylinder 316. That is to say, the leather sample 360 completely seals the upper end of the support cylinder, forming a negatively pressured and closed chamber inside the support cylinder. Under the action of the negative pressure, the piston column 370 drives the wedge plate 382 to move towards the inside of the support cylinder. Under the action of the tip of the wedge plate 382, the wedge plate 382 enters the lower side of the leather sample 360 and supports the edge of the leather sample 360. Then, the pneumatic telescopic cylinder 340 is driven to extend, so that the pressing cover 330 descends. At the same time, the driving mechanism 350 is started. After the pressing wheel 333 of the roller assembly contacts the upper side of the leather sample 360, the pressing wheel 333 starts to move upward relative to the pressing cover 330 against the acting force of the return spring until the pressing wheel 333, the intermediate wheel 334, and the helical gear 335 are in mutual transmission with each other, so that the driving gear ring 336 rotates to drive the pressing wheels 333 of all the roller assemblies to rotate, and the rotation direction of the pressing wheel 333 can radially outwardly stretch the edge of the leather sample 360, so that the leather sample 360 remains in an extended state. Then, as the pressing cover 330 continues to descend, the pressing ring 332 starts to be in extrusion fit with the edge of the leather sample 360, so that the leather sample 360 is clamped between the support cylinder and the pressing cover 330. Then, the hydraulic oil in the hydraulic cylinder 310 is controlled to make the piston 313 drive the ejector rod 314 to move upward and pierce the leather sample 360, thereby completing the bursting test of the leather sample 360. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A leather strength testing device, comprising a box and a testing mechanism arranged in the box, characterized in that: The detection mechanism includes a hydraulic cylinder whose axis extends in the up-down direction, a placing table for placing leather samples is provided at the upper end of the hydraulic cylinder, and the placing table includes a supporting cylinder coaxially arranged with the hydraulic cylinder, a piston and a push rod are provided in the hydraulic cylinder, and the push rod is located on the central axis of the supporting cylinder, one end of the push rod is fixedly connected to the piston, and the other end extends out of the hydraulic cylinder and is used to break the leather sample on the placing table from bottom to top, the supporting cylinder includes a straight cylinder coaxial with the hydraulic cylinder and a flange located at the upper end of the straight cylinder, a ring table coaxial with the flange is provided on the upper end surface of the flange, and the ring table is used to The edge support is matched, and one side of the support tube is connected to a negative pressure adsorption system. After the leather sample is placed on the upper side of the support tube, the negative pressure adsorption system sucks the air in the support tube so that the leather sample is adsorbed on the upper side of the support tube. The top of the box is provided with a downward pressure cover that can be raised and lowered above the placement table. After the leather sample is adsorbed on the upper side of the support tube, the downward pressure cover descends and presses down the leather sample so that the edge of the leather sample is clamped and fixed by the support tube and the downward pressure cover; a rolling mechanism connected to the driving mechanism is provided on the downward pressure cover, and the rolling mechanism includes a roller assembly installed in the downward pressure cover in a floating manner along the up and down directions, and the roller assembly includes The flange is provided with a lower pressing wheel, and when the lower pressing cover descends, the lower pressing wheel presses down the edge of the leather sample, and the driving mechanism drives the lower pressing wheel to roll to stretch the leather sample along the radial direction of the leather sample; a flat pushing mechanism is provided in the flange, and the flat pushing mechanism includes a wedge-shaped plate installed in the flange in a floating manner along the radial direction of the flange, and the end of the wedge-shaped plate facing the center of the supporting cylinder is a pointed end, and a guide groove extending along the radial direction of the flange is provided on the upper side surface of the flange, and a guide block is provided on the wedge-shaped plate, and the guide block is a strip block extending along the radial direction of the flange, one end of the guide block is fixedly connected to the wedge-shaped plate, and the other end is cantilevered and is used to stop the edge of the leather sample. The guide block is located in the guide groove to guide the wedge plate to move radially along the flange. When the negative pressure adsorption system adsorbs the leather sample, the wedge plate extends radially along the flange and extends into the lower side of the leather sample. The wedge plate and the lower pressing wheel jointly clamp the edge of the leather sample from the upper and lower sides of the leather sample. The roller assembly and the push mechanism are arranged one by one and multiple groups are arranged evenly spaced along the circumference of the support cylinder. A pressure ring is provided on the lower side of the lower pressing cover on the side of the roller assembly close to the center of the lower pressing cover. The pressure ring is used to press down the edge of the leather sample. In the initial state, the lower side of the lower pressing wheel is lower than the lower end of the pressure ring.

2. The leather strength detection device according to claim 1, characterized in that: A plurality of center tubes are coaxially nested in the support tube, and the upper end of the center tube is flush with the ring platform to support the center of the leather sample. An annular chamber is formed between the support tube and the outermost center tube and between two adjacent center tubes, and each annular chamber is connected to the negative pressure adsorption system.

3. The leather strength testing device according to claim 1, characterized in that: The roller assembly also includes a bevel gear and an intermediate wheel, which are arranged side by side, and the bevel gear, intermediate wheel and lower pressure wheel are installed in the lower pressure cover in sequence from top to bottom, and the axes of the bevel gear, intermediate wheel and lower pressure wheel of the same roller assembly are parallel and perpendicular to the radial direction of the support cylinder, and the intermediate wheel and lower pressure wheel are both friction wheels. When the lower pressure cover descends to press the roller assembly down on the edge of the leather sample, the axial ends of the bevel gear are respectively connected with the outer peripheral surface of the intermediate wheel by friction transmission, and the outer peripheral surface of the intermediate wheel is connected with the outer peripheral surface of the lower pressure wheel by friction transmission, and the driving mechanism drives the bevel gear to rotate, so that the bevel gear drives the lower pressure wheel to rotate through the intermediate wheel.

4. The leather strength testing device according to claim 3, characterized in that: Reset springs are respectively pressed between the bevel gear and the intermediate wheel, between the intermediate wheel and the lower pressure wheel, and between the bevel gear and the lower pressure cover of the same roller assembly. The bevel gear, the intermediate wheel and the lower pressure wheel are respectively movably installed in the lower pressure cover along the up and down directions. The reset springs make the bevel gear, the intermediate wheel and the lower pressure wheel arranged at intervals from each other in the initial state.

5. The leather strength detection device according to claim 4, characterized in that: A transmission gear ring coaxial with the lower pressure cover is rotatably provided inside the lower pressure cover, the outer periphery of the transmission gear ring is provided with helical teeth meshing with the helical gears of each roller assembly, the inner periphery of the transmission gear ring is provided with internal teeth, the driving mechanism has an output shaft, the output shaft is connected with a transmission gear, and the transmission gear meshes with the internal teeth of the transmission gear ring for transmission.

6. The leather strength testing device according to claim 5, characterized in that: A piston hole is provided on the inner wall of the support cylinder, a piston column is movably inserted into the piston hole, the piston column is fixedly connected to the wedge plate, and a tension spring is connected to the end of the piston column away from the center of the support cylinder, and the tension spring drives the wedge plate to retract into the flange along the radial direction of the flange.

7. The leather strength testing device according to claim 6, characterized in that: The upper side of the lower pressure cover is connected with a pneumatic telescopic cylinder, the top of the box is fixed with an L-shaped support arm, the lower end of the pneumatic telescopic cylinder is fixedly connected to the upper side of the lower pressure cover, and the upper end of the pneumatic telescopic cylinder is fixedly connected to the support arm.

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