Leather softness detection device

Abstract

The invention relates to the technical field of leather softness detection, in particular to a leather softness detection device which comprises a softness detector, a control box fixedly connected to a bottom platform of the softness detector and a movable support. The two ends of the top of the movable support are fixedly connected with a first anti-collision groove edge set and a second anti-collision groove edge set in a mirror symmetry mode respectively, a mounting groove is formed in the center of the movable support, and a shrinkage ring adjusting mechanism is arranged on the movable support. The hand feeling evaluation mechanism is arranged on the mounting groove; the combined driving assembly is arranged at the top end of the inner side of the control box and is in transmission connection with the shrinkage ring adjusting mechanism and the hand feeling evaluation mechanism; the combined driving assembly can be driven to control the shrinkage ring adjusting mechanism, the corresponding shrinkage ring is changed according to the type of leather needing to be tested, convenience and rapidness are achieved, the shrinkage ring cannot be lost, meanwhile, the combined driving device drives the hand feeling evaluation mechanism to detect the hand feeling of the leather, cost is low, and convenience is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of leather softness performance detection, in particular to a leather softness performance detection device. Background Art

[0002] Leather softness refers to the sensory properties of leather products that are similar to flexibility when touched. This property mainly reflects the softness and feel of leather when deformed by force, and is closely related to the mechanical properties of leather. The softness of leather directly affects the user experience of its products. Soft leather can bring a more comfortable feel and touch, making consumers feel happy during use. Soft leather is usually considered a symbol of high quality, so the price positioning is often higher. High-end leather such as sheepskin and deerskin is softer and relatively more expensive. Therefore, leather softness is one of the important indicators for evaluating leather quality. It not only affects the user experience, durability and aesthetics of leather products, but is also directly related to the market value of the product.

[0003] The published patent number is CN202903605U - a leather softness tester that can effectively detect the softness of leather. Different sizes of shrink rings need to be replaced for different types of leather, such as a 20mm diameter shrink ring (suitable for testing leather for shoes), a 25mm diameter shrink ring (suitable for testing leather for sofas), and a 35mm diameter shrink ring (suitable for testing leather for gloves or leather clothes). The replacement is troublesome, and the shrink ring is small in size and easy to lose. In addition, the application cannot detect the feel of the leather, and relying solely on the subjective judgment of the tester is not accurate enough. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a leather softness performance detection device to solve the above-mentioned problem.

[0005] Based on the above purpose, the present invention provides a leather softness performance testing device, including a softness tester, including:

[0006] A control box is fixedly connected to the bottom platform of the softness tester, a round hole is opened on the top of the control box, and two first limit sliding grooves are mirror-symmetrically arranged on the inner top of the control box;

[0007] The movable bracket has two connection parts that are fixedly connected in mirror symmetry, the tops of the two connection parts are respectively slidably connected with the corresponding two first limit sliding grooves, the two ends of the top of the movable bracket are respectively fixedly connected with the first anti-collision groove edge group and the second anti-collision groove edge group in mirror symmetry, the center of the movable bracket is provided with a mounting groove, the mounting groove is provided with a fixed distance circular groove, the bottom of the movable bracket is also provided with a mounting cavity, and the bottom of the front end of the movable bracket is fixedly connected with a connecting shaft;

[0008] A shrink ring adjustment mechanism is arranged on the movable bracket;

[0009] A hand feeling evaluation mechanism is arranged on the mounting groove;

[0010] The combined driving assembly is arranged at the inner top end of the control box and is transmission-connected with the shrink ring adjustment mechanism and the hand feeling evaluation mechanism.

[0011] As an optional embodiment, the shrinking ring adjustment mechanism includes two middle ring control slide groove plates fixedly connected to the first anti-collision groove edge group, two inner ring control slide groove plates fixedly connected to the second anti-collision groove edge group, an outer shrinking ring is fixedly connected to the top of the outer side of the control box, a middle shrinking ring is slidably matched with the inner side of the outer shrinking ring, and an inner shrinking ring is slidably matched with the inner side of the middle shrinking ring, two first connecting ears are fixedly connected to the two ends of the bottom of the middle shrinking ring in a mirror-symmetrical manner, a first circular limiting slider is fixedly connected to each of the first connecting ears in a mirror-symmetrical manner, two second connecting ears are fixedly connected to the two ends of the bottom of the inner shrinking ring in a mirror-symmetrical manner, and a second circular limiting slider is fixedly connected to each of the second connecting ears in a mirror-symmetrical manner, the two middle ring control slide groove plates are symmetrically provided with first slide grooves, the two first circular limiting sliders are slidably connected to the corresponding first slide grooves, the two inner ring control slide groove plates are symmetrically provided with second slide grooves, and the two second circular limiting sliders are slidably connected to the corresponding second slide grooves.

[0012] As an optional embodiment, the first slide groove includes a continuous first horizontal section and a first inclined section, the first horizontal section remains horizontal, and the first inclined section is inclined downward, the second slide groove includes a continuous second horizontal section, a second inclined section and a third horizontal section, the horizontal distances between the first slide groove and the second slide groove are equal, and the horizontal distance of the first horizontal section is equal to the horizontal distance of the second horizontal section plus the horizontal distance of the second inclined section.

[0013] As an optional implementation, when the first circular limit sliding block and the second circular limit sliding block are respectively located in the first horizontal section and the second horizontal section, the outer shrink ring, the middle shrink ring and the inner shrink ring are flush in height.

[0014] As an optional implementation, the hand feel evaluation mechanism includes a detection table rotatably connected to the fixed-distance circular groove, and laser sensors and photosensitive elements are symmetrically arranged at two ends of the top of the detection table, and the laser sensor is arranged at a certain inclination angle with the horizontal plane.

[0015] As an optional embodiment, the combined drive assembly includes a driving motor fixedly connected to the top inner side of the control box, the main shaft of the driving motor is transmission-connected with a first pulley, the top of the first pulley is fixedly connected with a transmission sleeve, the inner sleeve of the transmission sleeve is provided with a first one-way bearing, the outer circular end of the first one-way bearing is fixedly connected to the transmission sleeve, the inner circular end of the first one-way bearing is fixedly connected with a transmission shaft, the top of the transmission shaft is rotationally connected to the top inner side of the control box, the transmission shaft is fixedly connected with a driving gear, the inner bottom end of the control box is also fixedly connected with a fixed shaft, and the fixed shaft is rotationally connected with a second The cam is connected to the transmission shaft by a first transmission belt, the second transmission belt is fixedly connected to the second pulley, the outer circle end of the driving short shaft is fixedly connected to the second one-way bearing, the limiting directions of the first one-way bearing and the second one-way bearing are opposite, the outer circle end of the second one-way bearing is fixedly connected to the first connecting rod, the end of the first connecting rod is hinged to the second connecting rod, the end of the second connecting rod is hinged to the sliding rod, the end of the sliding rod is hinged to the connecting shaft, the inner bottom of the control box is fixedly connected to a limiting block, the top of the limiting block is provided with a limiting opening, and the sliding rod is slidably connected to the limiting opening.

[0016] As an optional embodiment, the combined drive assembly also includes a third pulley rotatably connected in the installation cavity, the top of the third pulley passes through the fixed-distance circular groove and is fixedly connected to the detection table, and a fourth pulley is also rotatably connected in the installation cavity, a second transmission belt is transmission-connected between the fourth pulley and the third pulley, a driven gear is fixedly connected to the top of the fourth pulley, and the module and pressure angle between the driven gear and the driving gear are equal.

[0017] As an optional implementation, a control button is also fixedly connected to the outer end of the control box.

[0018] As an optional implementation, the control button is also provided with an anti-slip texture.

[0019] As an optional implementation, a display screen is also fixedly connected to the outer end of the control box.

[0020] The beneficial effects of the present invention are as follows: the present invention can drive the combined drive assembly to control the shrink ring adjustment mechanism, and change the corresponding shrink ring according to the type of leather to be tested. Compared with the traditional softness tester, the present invention is convenient and fast, and the shrink ring will not be lost. At the same time, the feel evaluation mechanism is driven by the combined drive device to detect the feel of the leather, which is low-cost and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the embodiment of the present invention Figure 1 ;

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the embodiment of the present invention Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of a control box according to an embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the internal structure of the control box according to the embodiment of the present invention Figure 1 ;

[0026] Figure 5 Schematic diagram of the internal structure of the control box according to the embodiment of the present invention Figure 2 ;

[0027] Figure 6 Schematic diagram of the internal structure of the control box according to the embodiment of the present invention Figure 3 ;

[0028] Figure 7 Schematic diagram of the internal structure of the control box according to the embodiment of the present invention Figure 4 ;

[0029] Figure 8 A longitudinal cross-sectional view of a control box according to an embodiment of the present invention;

[0030] Fig. 9 This is a transverse cross-sectional view of a control box according to an embodiment of the present invention.

[0031] The markings in the figure are:

[0032] 1. Control box; 11. Round hole; 12. First limit slide; 2. Movable bracket; 21. Connecting part; 22. First anti-collision groove side group; 23. Second anti-collision groove side group; 24. Mounting groove; 25. Fixed distance circular groove; 26. Mounting cavity; 27. Connecting shaft; 3. Shrink ring adjustment mechanism; 31. Middle ring control slide plate; 32. First slide; 321. First horizontal section; 322. First oblique section; 33. Inner ring control slide plate; 34. Second slide; 341. Second horizontal section; 342. Second oblique section; 343. Third horizontal section; 35. Outer shrink ring; 36. Middle shrink ring; 361. First connecting ear; 362. First circular limit slider; 37. Inner shrink ring; 371. Second connecting ear; 3 72. Second circular limit slider; 4. Hand feel evaluation mechanism; 41. Detection cone; 42. Laser sensor; 43. Photosensitive element; 5. Combined drive assembly; 51. Drive motor; 511. First pulley; 512. Transmission sleeve; 513. First one-way bearing; 52. Transmission shaft; 521. Drive gear; 53. Fixed shaft; 531. Second pulley; 532. First transmission belt; 533. Driving short shaft; 534. Second one-way bearing; 54. First connecting rod; 55. Second connecting rod; 56. Sliding rod; 57. Limit block; 571. Limit opening; 58. Third pulley; 59. Fourth pulley; 591. Second transmission belt; 592. Driven gear; 6. Control button; 7. Display screen. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] like Figure 1-Figure 9 As shown, a leather softness performance testing device includes a softness tester, including:

[0036] A control box 1 is fixedly connected to the bottom platform of the softness tester, a round hole 11 is opened on the top of the control box 1, and two first limiting sliding grooves 12 are mirror-symmetrically arranged on the inner top of the control box 1;

[0037] The movable bracket 2 has two connection parts 21 fixedly connected in two mirror-image symmetry, the tops of the two connection parts 21 are respectively slidably connected with the corresponding two first limiting sliding grooves 12, the two ends of the top of the movable bracket 2 are respectively mirror-image symmetric and fixedly connected with the first anti-collision groove edge group 22 and the second anti-collision groove edge group 23, the movable bracket 2 is provided with a mounting groove 24 in the center, and the mounting groove 24 is provided with a fixed distance circular groove 25, the bottom of the movable bracket 2 is also provided with a mounting cavity 26, and the bottom of the front end of the movable bracket 2 is fixedly connected with a connecting shaft 27;

[0038] The shrink ring adjustment mechanism 3 is arranged on the movable bracket 2;

[0039] A hand feeling evaluation mechanism 4 is arranged on the mounting groove 24;

[0040] The combined driving assembly 5 is arranged at the inner top end of the control box 1 and is transmission-connected with the ring shrinking adjustment mechanism 3 and the hand feeling evaluation mechanism 4 .

[0041] In this embodiment, the leather is placed on the outer shrink ring 35 for testing. The softness test is no different from the softness tester on the market (Sivaka CV-4023S). The difference is that it can drive the combined drive assembly 5 to control the shrink ring adjustment mechanism 3. According to the type of leather to be tested, the corresponding shrink ring is changed. Compared with the traditional softness tester, it is convenient and fast and the shrink ring will not be lost. At the same time, the feel evaluation mechanism 4 driven by the combined drive device is used to detect the feel of the leather.

[0042] As an optional implementation, Figure 5 , 6As shown in , 8 and 9, the shrink ring adjustment mechanism 3 includes two middle ring control slide groove plates 31 fixedly connected to the first anti-collision groove edge group 22, two inner ring control slide groove plates 33 fixedly connected to the second anti-collision groove edge group 23, an outer shrink ring 35 fixedly connected to the top of the outer side of the control box 1, a middle shrink ring 36 slidingly matched inside the outer shrink ring 35, an inner shrink ring 37 slidingly matched inside the middle shrink ring 36, two first connecting ears 361 are fixedly connected at both ends of the bottom of the middle shrink ring 36 in a mirror-symmetrical manner, and each of the first connecting ears 361 is fixedly connected to a first A circular limit slider 362, two second connecting ears 371 are fixedly connected in a mirror-symmetrical manner at both ends of the bottom of the inner shrink ring 37, and a second circular limit slider 372 is fixedly connected in a mirror-symmetrical manner on each of the second connecting ears 371. The two middle ring control slide groove plates 31 are symmetrically provided with first slide grooves 32, and the two first circular limit sliders 362 are slidably connected to the corresponding first slide grooves 32. The two inner ring control slide groove plates 33 are symmetrically provided with second slide grooves 34, and the two second circular limit sliders 372 are slidably connected to the corresponding second slide grooves 34.

[0043] In this way, the displacement of the movable bracket 2 will drive the movement of the inner ring control slide plate 33 and the middle ring control slide plate 31, and then pull the inner shrink ring 37 and the middle shrink ring 36 to change the height direction; wherein, the outer shrink ring 35, the middle shrink ring 36 and the inner shrink ring 37 have three states in combination, the outer shrink ring 35 itself is fixed, and the outer shrink ring 35, the middle shrink ring 36 and the inner shrink ring 37 are at the same height. State one, at this time, the measurement is based on the inner shrink ring 37 as the standard, the outer shrink ring 35 itself is fixed, the outer shrink ring 35 and the middle shrink ring 36 are at the same height, and the inner shrink ring 37 is reduced to state two, at this time, the measurement is based on the middle shrink ring 36 as the standard, the outer shrink ring 35 itself is fixed, and the middle shrink ring 36 and the inner shrink ring 37 are both reduced to state three, at this time, the measurement is based on the outer shrink ring 35 as the standard; by moving the movable bracket 2 a specific distance, the switching between state one, state two and state three can be achieved.

[0044] As an optional implementation, Figure 5 , 6 As shown in , 8 and 9, the first slide groove 32 includes a continuous first horizontal section 321 and a first inclined section 322, the first horizontal section 321 remains horizontal, and the first inclined section 322 is inclined downward, the second slide groove 34 includes a continuous second horizontal section 341, a second inclined section 342 and a third horizontal section 343, the first slide groove 32 and the second slide groove 34 are at equal horizontal distances, and the horizontal distance of the first horizontal section 321 is equal to the horizontal distance of the second horizontal section 341 plus the horizontal distance of the second inclined section 342;

[0045] In this way, specific explanation support for the above three states is provided.

[0046] As an optional implementation, Figure 8 As shown, when the first circular limiting slider 362 and the second circular limiting slider 372 are located in the first horizontal section 321 and the second horizontal section 341 respectively, the outer shrink ring 35 and the middle shrink ring 36 and the inner shrink ring 37 are flush with each other;

[0047] In this way, specific explanation support for the above three states is provided.

[0048] As an optional implementation, Figure 5 , 7 As shown, the hand feeling evaluation mechanism 4 includes a detection truncated table 41 rotatably connected to the distance circular groove 25, and a laser sensor 42 and a photosensitive element 43 are symmetrically arranged at two ends of the top of the detection truncated table 41, and the laser sensor 42 is arranged at a certain inclination angle with the horizontal plane;

[0049] The smaller the roughness of the leather surface, the smoother the leather surface is, and the better the hand feel is. At the same time, the oil content is one of the important parameters for measuring the softness and glossiness of leather, and it is also an important indicator for measuring the toughness and water resistance of leather. Leather with a high oil content has good softness, because the oil plays a role of lubrication and softening inside the leather, which makes the leather with a high oil content softer and more comfortable to the touch. Similarly, the reflection effect is also better. The detection table 41 is driven by the combined driving device to rotate one circle, and two measurements are performed on the leather covered on the outer shrink ring 35 at the same time: first, the roughness of the leather surface is judged by the laser ranging sensor sensing the undulation of the leather surface and the length of the path of one circle, and the smaller the undulation and the shorter the path, the smaller the roughness. Second, the light emitted by the laser ranging sensor during the test is reflected to the photosensitive element 43 through the leather surface. A large relative amount of light input indicates that the leather has good gloss. The measurement data of the two are combined to make an objective evaluation of the hand feel of the leather.

[0050] When the hand-feel driving device is driven, the joint driving assembly 5 causes the movable bracket 2 to displace the detection table 41 to be located directly below the inner shrink ring 37, and the laser of the laser sensor 42 can penetrate the inner shrink ring 37 and irradiate the leather to be tested. At the same time, the driven gear 592 and the driving gear 521 are meshed, and the driving gear 521 drives the driven gear 592 to rotate one circle, which is recorded as state four.

[0051] As an optional implementation, Figure 5 , 6As shown in , 7 and 8, the combined drive assembly 5 includes a driving motor 51 fixedly connected to the top inner side of the control box 1, a first pulley 511 is drivingly connected to the main shaft of the driving motor 51, a transmission sleeve 512 is fixedly connected to the top of the first pulley 511, a first one-way bearing 513 is provided inside the transmission sleeve 512, an outer cylindrical end of the first one-way bearing 513 is fixedly connected to the transmission sleeve 512, a transmission shaft 52 is fixedly connected to the inner cylindrical end of the first one-way bearing 513, the top of the transmission shaft 52 is rotatably connected to the top inner side of the control box 1, a driving gear 521 is fixedly connected to the transmission shaft 52, a fixed shaft 53 is also fixedly connected to the bottom inner side of the control box 1, a second pulley 531 is rotatably connected to the fixed shaft 53, the first A first transmission belt 532 is connected between the pulley 511 and the second pulley 531. A driving short shaft 533 is fixedly connected to the second pulley 531. A second one-way bearing 534 is fixedly connected to the outer cylindrical end of the driving short shaft 533. The limiting directions of the first one-way bearing 513 and the second one-way bearing 534 are opposite. A first connecting rod 54 is fixedly connected to the outer cylindrical end of the second one-way bearing 534. A second connecting rod 55 is hinged to the end of the first connecting rod 54. A sliding rod 56 is hinged to the end of the second connecting rod 55. The end of the sliding rod 56 is hinged to the connecting shaft 27. A limiting block 57 is fixedly connected to the inner bottom of the control box 1. A limiting opening 571 is arranged on the top of the limiting block 57. The sliding rod 56 is slidably connected to the limiting opening 571. ;

[0052] In this way, due to the one-way limited rotation of the first one-way bearing 513 and the second one-way bearing 534, the positive rotation of the driving motor 51 will drive the transmission shaft 52 to rotate through the first pulley 511 and the first one-way bearing 513, and then the driving gear 521 will rotate. At this time, although the first pulley 511 drives the second pulley 531 to rotate through the first conveyor belt, the second one-way bearing 534 will not drive the first connecting rod 54 to rotate.

[0053] Similarly, the reverse rotation of the drive motor 51 will cause the second pulley 531 to drive the second one-way bearing 534 to rotate the first connecting rod 54, driving the first connecting rod 54 to pull the second connecting rod 55, so that the slide bar 56 performs reciprocating linear motion under the limit of the limit opening 571. At this time, the slide bar 56 drives the connecting shaft 27 to make the movable bracket 2 slide under the limit of the first limit slide groove 12, thereby switching between states one to three to provide power support. At this time, due to the action of the first one-way bearing 513, the driving gear 521 does not rotate.

[0054] As an optional implementation, Figure 5 , 6As shown in , 7 and 8, the combined drive assembly 5 also includes a third pulley 58 rotatably connected to the mounting cavity 26, the top of the third pulley 58 passes through the distance circular groove 25 and is fixedly connected to the detection truncated table 41, and a fourth pulley 59 is also rotatably connected to the mounting cavity 26, a second transmission belt 591 is transmission-connected between the fourth pulley 59 and the third pulley 58, a driven gear 592 is fixedly connected to the top of the fourth pulley 59, and the module and pressure angle between the driven gear 592 and the driving gear 521 are equal;

[0055] When it is necessary to enter state four, it is necessary to first enter state three, so that the driving gear 521 is engaged with the driven gear 592, and then the driving motor 51 is reversed, so that the driving gear 521 drives the driven gear 592 to rotate, and the fourth pulley 59 drives the third transmission belt to rotate through the second transmission belt 591, thereby driving the detection stage 41 to rotate.

[0056] As an optional implementation, Figure 1 As shown, the outer end of the control box 1 is also fixedly connected to a control button 6;

[0057] The control button 6 is used to facilitate the inspector to change states one to four according to the situation.

[0058] As an optional implementation, the control button 6 is also provided with an anti-slip texture;

[0059] In this way, a key feel is provided.

[0060] As an optional implementation, Figure 1 As shown, the outer end of the control box 1 is also fixedly connected to a display screen 7;

[0061] This is used to display operation data and status.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A leather softness testing device, comprising a softness testing instrument, characterized in that: include: A control box (1) is fixedly connected to the bottom platform of the softness tester, a circular hole (11) is provided on the top of the control box (1), and two first limit sliding grooves (12) are mirror-symmetrically provided on the inner top of the control box (1); The movable bracket (2) has two connection parts (21) fixedly connected in a mirror-symmetrical manner, the tops of the two connection parts (21) are respectively slidably connected to the corresponding two first limiting sliding grooves (12), the two ends of the top of the movable bracket (2) are respectively mirror-symmetrically fixedly connected with a first anti-collision groove edge group (22) and a second anti-collision groove edge group (23), the movable bracket (2) is provided with a mounting groove (24) in the center, and a fixed-distance circular groove (25) is provided on the mounting groove (24), the bottom of the movable bracket (2) is also provided with a mounting cavity (26), and the bottom of the front end of the movable bracket (2) is fixedly connected with a connecting shaft (27); A shrink ring adjustment mechanism (3) is arranged on the movable bracket (2); A hand feeling evaluation mechanism (4) is arranged on the installation groove (24); The combined drive assembly (5) is arranged at the inner top end of the control box (1) and is transmission-connected to the ring shrinkage adjustment mechanism (3) and the hand feel evaluation mechanism (4).

2. The leather softness testing device according to claim 1, characterized in that: The shrink ring adjustment mechanism (3) comprises two middle ring control slide groove plates (31) fixedly connected to the first anti-collision groove edge group (22), two inner ring control slide groove plates (33) fixedly connected to the second anti-collision groove edge group (23), an outer shrink ring (35) fixedly connected to the top of the outer side of the control box (1), a middle shrink ring (36) slidably matched to the inner side of the outer shrink ring (35), an inner shrink ring (37) slidably matched to the inner side of the middle shrink ring (36), two first connecting ears (361) are fixedly connected to the two ends of the bottom of the middle shrink ring (36) in a mirror-symmetrical manner, and each of the first connecting ears (361) is fixedly connected to a first circular A limit slider (362), two second connecting ears (371) are fixedly connected in a mirror-symmetrical manner at both ends of the bottom of the inner shrink ring (37), and a second circular limit slider (372) is fixedly connected in a mirror-symmetrical manner on each of the second connecting ears (371), the two middle ring control slide groove plates (31) are symmetrically provided with first slide grooves (32), the two first circular limit sliders (362) are slidably connected to the corresponding first slide grooves (32), the two inner ring control slide groove plates (33) are symmetrically provided with second slide grooves (34), and the two second circular limit sliders (372) are slidably connected to the corresponding second slide grooves (34).

3. The leather softness testing device according to claim 2, characterized in that: The first slide groove (32) includes a continuous first horizontal section (321) and a first inclined section (322), the first horizontal section (321) remains horizontal, and the first inclined section (322) is inclined downward, the second slide groove (34) includes a continuous second horizontal section (341), a second inclined section (342) and a third horizontal section (343), the first slide groove (32) and the second slide groove (34) are at the same horizontal distance, and the horizontal distance of the first horizontal section (321) is equal to the horizontal distance of the second horizontal section (341) plus the horizontal distance of the second inclined section (342).

4. The leather softness testing device according to claim 3, characterized in that: When the first circular limiting slider (362) and the second circular limiting slider (372) are respectively located in the first horizontal section (321) and the second horizontal section (341), the outer shrink ring (35), the middle shrink ring (36) and the inner shrink ring (37) are flush in height.

5. The leather softness testing device according to claim 1, characterized in that: The hand feeling evaluation mechanism (4) comprises a detection truncated platform (41) rotatably connected to the distance circular groove (25), and a laser sensor (42) and a photosensitive element (43) are symmetrically arranged at two ends of the top of the detection truncated platform (41), and the laser sensor (42) is arranged at a certain inclination angle with respect to the horizontal plane.

6. The leather softness testing device according to claim 1, characterized in that: The combined drive assembly (5) comprises a drive motor (51) fixedly connected to the top inner side of the control box (1); a first pulley (511) is transmission-connected to the main shaft of the drive motor (51); a transmission sleeve (512) is fixedly connected to the top of the first pulley (511); a first one-way bearing (513) is sleeved inside the transmission sleeve (512); an outer circular end of the first one-way bearing (513) is fixedly connected to the transmission sleeve (512); an inner circular end of the first one-way bearing (513) is fixedly connected to a transmission shaft (52); the top of the transmission shaft (52) is rotationally connected to the top inner side of the control box (1); a driving gear (521) is fixedly connected to the transmission shaft (52); a fixed shaft (53) is also fixedly connected to the bottom inner side of the control box (1); a second pulley (531) is rotationally connected to the fixed shaft (53); the first pulley (51 1) and a second pulley (531) are connected in transmission with a first transmission belt (532); a driving short shaft (533) is fixedly connected to the second pulley (531); a second one-way bearing (534) is fixedly connected to the outer circular end of the driving short shaft (533); the limiting directions of the first one-way bearing (513) and the second one-way bearing (534) are opposite; a first connecting rod (54) is fixedly connected to the outer circular end of the second one-way bearing (534); a second connecting rod (55) is hingedly connected to the end of the first connecting rod (54); a sliding rod (56) is hingedly connected to the end of the second connecting rod (55); the end of the sliding rod (56) is hingedly connected to the connecting shaft (27); a limiting block (57) is fixedly connected to the inner bottom of the control box (1); a limiting opening (571) is arranged on the top of the limiting block (57); and the sliding rod (56) is slidably connected to the limiting opening (571).

7. The leather softness testing device according to claim 6, characterized in that: The combined drive assembly (5) also includes a third pulley (58) rotatably connected to the mounting cavity (26), the top of the third pulley (58) passes through the spacing circular groove (25) and is fixedly connected to the detection table (41), and a fourth pulley (59) is also rotatably connected to the mounting cavity (26), a second transmission belt (591) is transmission-connected between the fourth pulley (59) and the third pulley (58), and a driven gear (592) is fixedly connected to the top of the fourth pulley (59), and the module and pressure angle between the driven gear (592) and the driving gear (521) are equal.

8. The leather softness testing device according to claim 1, characterized in that: The outer end of the control box (1) is also fixedly connected with a control button (6).

9. The leather softness testing device according to claim 1, characterized in that: The control button (6) is also provided with an anti-slip texture.

10. The leather softness testing device according to claim 1, characterized in that: The outer end of the control box (1) is also fixedly connected to a display screen (7).

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