Leather tanning device based on multi-dimensional linkage stirring

Abstract

The leather tanning device comprises a main box body, the upper portion of the main box body is provided with a feeding port and an agent adding port, and the lower portion of the main box body is provided with a liquid discharging port and a discharging door; the multi-dimensional stirring mechanism is arranged in the main body box body; the variable-volume extrusion tanning system is linked with the multi-dimensional stirring mechanism; the vacuum system is connected with the main box body; the automatic control system is arranged on the main box body; wherein the multi-dimensional stirring mechanism comprises a central rotating shaft driven by a first driving motor, a planetary gear set consisting of a sun gear, a planetary gear and an inner gear ring, and an eccentric swinging assembly consisting of a first cam and a connecting rod mechanism. Through cooperation of multi-dimensional linkage stirring, intelligent extrusion rubbing and vacuum pulsation, leather tanning efficiency, uniformity, environmental protection and finished product quality are comprehensively improved, and the problem of leather winding is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of leather processing equipment technology, and in particular to a leather tanning device based on multi-dimensional linkage stirring. Background Technology

[0002] Leather tanning is the core process in leather making, aiming to transform raw hides into leather that is resistant to decay, durable, and possesses excellent physicochemical properties. Currently, the mainstream tanning equipment is the rotary drum, whose working principle mainly relies on the rotation of the container to create relative movement between the hide and the tanning liquor, thereby achieving the penetration and bonding of the tanning agent.

[0003] Existing drum technology is mainly divided into two categories, but significant drawbacks still exist:

[0004] Traditional unidirectional rotating wooden drums offer simple equipment structure and low cost. However, their mechanical action is singular, relying solely on the falling and slamming of the hides within the drum. This method results in random and uneven force, easily causing the hides, especially large ones, to entangle and knot, forming "dead creases" and creating blind spots in the tanning process. Not only is the tanning cycle long (usually requiring 8-12 hours or more), but the finished leather is also prone to problems such as significant variations in texture, uneven softness, and substandard tear strength. Furthermore, high energy consumption, low automation, and a poor working environment are also significant drawbacks.

[0005] Modern bidirectional rotating stainless steel vacuum drums: These drums add forward and reverse rotation functions and a vacuum / pressurization system to the traditional drum. While forward and reverse rotation can alleviate entanglement to some extent, it doesn't fundamentally solve the tendency for hides to curl and knot due to continuous unidirectional force. The vacuum system promotes tanning agent penetration through negative pressure, but its effect is passive and static, with limited physical separation of entangled fibers. Although such equipment improves uniformity and efficiency, its core mechanism remains limited to "whole container rotation," lacking sufficient dimensionality and intensity of mechanical action. The tanning cycle remains long, and its ability to process high-grade leather products with extremely high uniformity requirements is limited.

[0006] In summary, the fundamental flaw of existing technologies lies in their "single mechanical action mode." Whether rotating in one or two directions, the force applied to the leather is primarily a holistic throwing motion, lacking active, multi-dimensional, and deep-fiber-penetrating separation, kneading, and squeezing actions. This leads to a vicious cycle in the tanning process: "entanglement-uneven penetration-long cycle-unstable quality," becoming a long-standing technological bottleneck restricting the industry's efforts to improve quality and efficiency and achieve green development. Therefore, there is an urgent need for a new type of intelligent equipment capable of actively intervening in the movement of leather and simulating the complex movements of advanced hand tanning. Summary of the Invention

[0007] To address the problems mentioned in the background section, the present invention provides a leather tanning apparatus based on multi-dimensional linkage stirring.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A leather tanning apparatus based on multi-dimensional linkage stirring includes a main body housing with an inlet and an additive inlet at the top, and a drain and discharge gate at the bottom; a multi-dimensional stirring mechanism disposed inside the main body housing; a variable volume extrusion tanning system disposed on the inner wall of the main body housing; an intelligent anti-tangling leather separation mechanism disposed on the inner wall of the main body housing; a vacuum system connected to the main body housing; and an automatic control system installed on the top of the main body housing; the automatic control system is used to control the multi-dimensional stirring mechanism, the variable volume extrusion tanning system, the intelligent anti-tangling leather separation mechanism, and the vacuum system to work together.

[0010] Preferably, the multidimensional stirring mechanism includes:

[0011] The central rotating shaft is driven by a first drive motor installed outside the housing;

[0012] The planetary gear set includes a sun gear fixed on the central rotating shaft, at least three evenly distributed planet gears, and an internal gear ring disposed on the inner wall of the main body housing. The planet gears mesh with both the internal gear ring and the sun gear.

[0013] A stirring arm is movably connected to the axis of each of the planetary gears;

[0014] An eccentric oscillating assembly is connected between the central rotating shaft and the stirring arm, and is used to drive the stirring arm to reciprocate along its axial direction.

[0015] Preferably, the end effector of the stirring arm adopts a flexible finger cluster structure, which is made of super-elastic plastic or silicone; the surface of the stirring arm is provided with multiple turbulence protrusions.

[0016] Preferably, the eccentric oscillating assembly includes:

[0017] The first cam is fixedly connected to the central rotating shaft;

[0018] A planetary carrier, connected to the planetary gears, has a guide protrusion on its end face, and a guide groove is formed on the guide protrusion.

[0019] A sliding block is slidably connected to the guide groove, and a compression spring is provided in the guide groove. The two ends of the compression spring are respectively connected to the inner wall of the guide groove and the sliding block.

[0020] A roller is rotatably connected to the sliding block, and its surface contacts the edge of the first cam.

[0021] A connecting rod, one end of which is hinged to the sliding block, and the other end of which is hinged to the stirring arm;

[0022] The planetary gear has a circumferentially ...

[0023] Preferably, the variable volume extrusion tanning system includes:

[0024] The flexible cavity is installed in a fixing groove provided on the inner wall of the main body box;

[0025] A hydraulic cylinder, whose piston rod is connected to the flexible bladder, is used to drive the flexible bladder to periodically expand and contract;

[0026] A linkage compression mechanism is used to cooperate with the expanded flexible cavity to form a counter-compression.

[0027] Preferably, the linkage extrusion mechanism includes:

[0028] A rotating sleeve is fitted onto the central rotating shaft;

[0029] A rotating plate is fixedly connected to the rotating sleeve, and a limiting groove is provided on its side wall;

[0030] The second slider is slidably connected to the limiting groove, and the limiting groove is provided with a tension spring at both ends that are respectively connected to the limiting groove and the second slider;

[0031] A linkage extrusion plate is connected to the side end of the second slider via a fixing plate, and the linkage extrusion plate is provided with an array of liquid permeable holes;

[0032] The second cam is fixedly installed on the inner wall of the main body box, and its inner ring contour abuts against the second slider.

[0033] The rotating sleeve is driven by a second drive motor through a gear set, and its rotational speed is the same as the revolution speed of the stirring arm.

[0034] Preferably, the outer end of the rotating sleeve is provided with a third cam, and the edge of the third cam abuts against the piston of the hydraulic cylinder.

[0035] Preferably, the intelligent anti-tangling leather separation mechanism includes multiple retractable separation plates and a triggering mechanism; the retractable separation plates are made of shape memory alloy material and automatically extend at a tanning temperature of 35-40℃; the triggering mechanism includes a temperature sensor and a mechanical linkage rod, used to automatically activate the retractable separation plates when leather tangling is detected.

[0036] Preferably, the vacuum system is capable of periodically varying the pressure within the tanning chamber within the range of -0.09 MPa to -0.06 MPa under the control of the automatic control system.

[0037] A leather tanning method using the leather tanning apparatus based on multi-dimensional linkage stirring as described in any one of the claims, characterized in that it includes the following stages: initial dispersion stage: starting the vacuum system and controlling the multi-dimensional stirring mechanism to run at low speed, using the flexible finger clusters of the stirring arm to grasp, comb and disperse the clumps of leather;

[0038] Active kneading stage: Control the high-speed operation of the multi-dimensional stirring mechanism so that the stirring arm twists and throws the leather under the combined action of revolution, rotation and axial reciprocating motion; at the same time, control the variable volume extrusion tanning system to work synchronously so that the flexible bladder and the linkage extrusion plate perform periodic antagonistic extrusion and kneading on the leather.

[0039] Homogenization and stabilization stage: Reduce the rotation speed of the multi-dimensional stirring mechanism and the working frequency of the variable volume extrusion tanning system to further stabilize the leather fibers under low-intensity mechanical action.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. Revolutionary Improvement in Tanning Efficiency and Quality: A multi-dimensional stirring mechanism composed of a planetary gear set and an eccentric oscillating component drives the stirring arm to achieve a composite motion of "revolution, rotation, and axial reciprocating motion." This allows the flexible finger clusters to form complex three-dimensional motion trajectories in the tanning liquor, actively penetrating and breaking up hide piles, acting on every part of each leather without blind spots. The synchronous counter-movement of the linkage between the extrusion plate and the flexible cavity creates a high-intensity, high-frequency "rubbing-shearing" force field locally, powerfully driving the tanning agent to undergo micro-circulation and exchange between leather fibers. The periodically changing vacuum creates a "pumping" effect, synergistically enhancing the penetration of the tanning agent deep into the fibers. Experimental data shows that, within the same 8-hour tanning time, the tanning effect (chromium absorption rate, uniformity) of the device of this invention (experimental group) far exceeds that of traditional equipment. This is equivalent to increasing the effective tanning efficiency by approximately 40%. The finished leather exhibits minimal variation in different parts, with highly uniform overall performance, and the overall tanning time is shortened by 30%-50%.

[0042] 2. Significantly Reduced Chemical Consumption and Pollution: The variable-volume extrusion tanning system works in conjunction with a vacuum system. The periodic "massaging" extrusion of the flexible bladder and the dynamic "counter-force" kneading of the linked extrusion plates work together to force the tanning agent to penetrate efficiently deep into the leather fibers. This significantly reduces the amount of tanning agent used. Experimental data shows that the chromium content in the wastewater is the lowest (only 0.41%), and the chromium absorption and utilization rate is increased by more than 25% compared to commercially available advanced equipment (control group B), with the absorption rate reaching an extremely high level of over 99%. This greatly reduces heavy metal pollution at the source, which not only lowers raw material costs but also significantly reduces the environmental pressure of subsequent wastewater treatment. At the same time, energy consumption per unit output is reduced by approximately 40.7%, demonstrating outstanding green economic benefits.

[0043] 3. Intelligent solution to leather entanglement problem: Multi-dimensional stirring itself has a continuous untangling capability. Combined with the shape memory alloy separation plate of the intelligent anti-entanglement separation mechanism, it can automatically intervene physically when entanglement trend is detected, fundamentally eliminating the phenomenon of leather knots forming "dead folds", realizing smooth operation throughout the process without the need for machine stoppage and manual handling, laying the foundation for intelligent and continuous production.

[0044] 4. Improved overall quality of finished leather: The multi-dimensional mechanical action is similar to a comprehensive "massage" and "combing" of the fibers, making the fibers more dispersed and increasing the number of tanning agent binding points. The finished leather achieved the highest scores in both tear strength and sensory softness, proving that its fiber structure has been optimized and its physical properties are superior.

[0045] 5. High degree of automation and reliability: The flexible finger clusters are self-adaptive, automatically switching between "grabbing and combing" and "throwing and kneading" modes based on rotation speed without external control, adapting to the needs of different process stages. Through the automatic control system, all core parameters such as stirring speed, extrusion frequency, and vacuum curve can be precisely programmed and controlled, achieving fully automated and repeatable fine control from "rapid penetration" to "gentle finishing," suitable for customized production of various high-end leathers.

[0046] In summary, this invention achieves a comprehensive improvement in leather tanning efficiency, uniformity, environmental friendliness, and finished product quality through multi-dimensional linkage stirring, intelligent extrusion kneading, and vacuum pulse synergy, and fundamentally solves the problem of leather entanglement. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the overall structure of the leather tanning apparatus of the present invention;

[0049] Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention;

[0050] Figure 3 This is a schematic diagram of a planetary gear set.

[0051] Figure 4 This is a schematic diagram of the stirring arm structure of the present invention;

[0052] Figure 5 This is a schematic diagram of the structure of the first cam of the present invention;

[0053] Figure 6 This is a schematic diagram of the linkage extrusion plate structure of the present invention;

[0054] Figure 7 This is a schematic diagram of the third cam transmission structure of the invention.

[0055] 1. Main body; 2. Multi-dimensional stirring mechanism; 3. Variable volume extrusion tanning system; 4. Intelligent anti-tangling leather separation mechanism; 5. Vacuum system; 6. First drive motor; 7. Central rotating shaft; 8. Planetary gear set; 9. Eccentric oscillating component; 10. Sun gear; 21. Planetary gears; 222. Internal gear ring; 223. Planetary carrier; 224. Sliding support shaft; 2221. Limiting protrusion; 2222. Stirring arm; 24. Turbulence protrusion; 241. Flexible finger cluster; 242. Connecting rod; 2401. Limiting groove; 2402. Guide protrusion 2241, guide groove 2242, compression spring 2243, sliding block 2244, roller 2245, first cam 225, rotating plate 26, second cam 261, limiting groove 262, second slider 263, fixing plate 264, linkage extrusion plate 265, liquid permeation hole 266, rotating sleeve 27, third cam 271, second drive motor 272, first gear 273, second gear 274, fixing groove 101, flexible bladder 31, hydraulic cylinder 32. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] Example 1

[0058] Reference Figure 1-7A leather tanning apparatus based on multi-dimensional linkage stirring includes a main body 1, which is made of stainless steel and lined with a corrosion-resistant coating. The upper part of the body 1 has a feed inlet and an additive inlet, while the lower part has a drain outlet and a discharge gate. The body 1 is equipped with a multi-dimensional stirring mechanism 2. A variable volume extrusion tanning system 3 and an intelligent anti-tangling leather separation mechanism 4 are mounted on the mounting surface on the inner wall of the body 1. A vacuum system 5 is connected to the right side of the body 1, and an automatic control system 6 is installed on the top.

[0059] The main body 1 adopts a cylindrical structure with a circular cross-section, but the inner wall is provided with a mounting groove 101 for installing the variable volume extrusion tanning system 3. The diameter of the inner circle of the body is slightly larger than the diameter of the trajectory circle drawn by the end of the stirring arm 24 to ensure safe operating clearance.

[0060] The multi-dimensional stirring mechanism 2 includes a central rotating shaft 21, a planetary gear set 22, and an eccentric oscillating assembly 23. The central rotating shaft 21 is driven by a first drive motor 201 mounted outside the housing. The planetary gear set 22 includes a sun gear 221 fixed on the central rotating shaft 21, three evenly distributed planet gears 222, and an internal gear ring 223 disposed on the inner wall of the main housing 1. The planet gears 222 are meshed with both the internal gear ring 224 and the sun gear 221. The internal gear ring 223 is mounted on the housing via a one-way bearing. A stirring arm 24 is movably connected to the axis of each planet gear 222. The end effector of the stirring arm 24 adopts a flexible finger cluster 242 structure, made of ultra-elastic plastic or silicone, which can safely grasp and release leather without causing damage. The surface of the stirring arm is provided with multiple turbulence protrusions 241.

[0061] Furthermore, the end faces of the three evenly distributed planetary gears 222 are provided with planetary carriers 224, and the planetary gears 222 are rotatably connected to the planetary carriers 224. When the first drive motor 201 is started, it can drive the central shaft 21 to rotate, thereby driving the three stirring arms 24 to revolve around the central shaft 21. At the same time, the stirring arms 24 are driven to rotate by their own axis through the meshing connection of the planetary gears 222.

[0062] The eccentric oscillating assembly 23 includes a guide protrusion 2241 disposed on the end face of the planetary carrier 224 and a first cam 225 fixedly connected to the central rotating shaft 21. A guide groove 2242 is formed on the guide protrusion 2241, and a sliding block 2244 is slidably connected within the guide groove 2242. A roller 2245 is rotatably connected to the sliding block 2244, and the surface of the roller 2245 contacts the edge of the first cam 225. A compression spring 2243 is disposed inside the guide groove 2242. The compression spring 2243 is in a compressed state, with its fixed end fixedly connected to the inner wall of the guide groove 2242 and its movable end fixedly connected to the sliding block 2244. The planetary gear 222 has a support shaft 2221 coaxially on its end face. The circumferential surface of the support shaft 2221 has a limiting protrusion 2222. The inner wall of the stirring arm 24 has a limiting groove 2402. The limiting protrusion 2222 and the limiting groove 2402 are slidably connected to each other, so that only a relative sliding sliding pair is maintained between the stirring arm 24 and the support shaft 2221. The side end of the sliding block 2244 is hinged to a connecting rod 2401. One end of the connecting rod 2401 is rotatably connected to the sliding block 2244, and the other end is rotatably connected to the outer wall of the rotating ring rotatably connected to the stirring arm 24, so that the stirring arm 24 can periodically reciprocate axially while revolving and rotating.

[0063] The variable volume extrusion tanning system 3 includes a flexible cavity 31, a hydraulic cylinder 31, and a linkage extrusion plate 265. The flexible cavity 31 is installed in a fixing groove 101 provided on the inner wall of the main body box 1. The flexible cavity 31 achieves periodic volume changes through the hydraulic cylinder 31.

[0064] Furthermore, a rotating sleeve 27 is provided on the central rotating shaft 21, and a third cam 271 is provided on the outer end of the rotating sleeve 27. The edge of the third cam 271 abuts against the piston of the hydraulic cylinder 31.

[0065] A rotating plate 26 is fixedly connected to the rotating sleeve 27. A limiting groove 262 is formed on the side wall of the rotating plate 26. A second slider 263 is slidably connected in the limiting groove 262. The second slider 263 slides within the limiting groove 262. A tension spring is provided in the limiting groove 262. The fixed end of the tension spring is fixedly connected to the limiting groove 262, and the movable end is fixedly connected to the second slider 262. A fixing plate 264 is provided on the side wall of the second slider 262. A linkage pressing plate 265 is provided on the side end of the fixing plate 264. The linkage extrusion plate 265 is provided with an array of liquid permeable holes 266, and the inner wall of the main body box 1 is provided with a second cam 225. The second cam 225 is annular with a raised contour on the inner ring. The inner ring of the second cam 225 abuts against the second slider 262. When the linkage extrusion plate 265 rotates to the flexible bladder 31, the cam action can drive the linkage extrusion plate 265 to move outward. At the same time, the flexible bladder 31 bulges, causing compression and friction on the leather between the flexible bladder 31 and the linkage extrusion plate 265.

[0066] Furthermore, the rotating sleeve 27 is provided with a first gear 273, and the side end of the main body box 1 is provided with a second drive motor 272. The output end of the second drive motor 272 is provided with a second gear 274. The second gear 274 meshes with the first gear 273. The rotation speed of the second drive motor 272 is controlled by the automatic control system 6 so that the rotation speed of the rotating sleeve 27 is the same as the revolution speed of the stirring arm 24. At this time, the squeezing work of the linkage extrusion plate 265 rotating to the flexible cavity 31 will not interfere with the stirring arm 24.

[0067] The intelligent anti-tangling leather separation mechanism 4 includes multiple retractable separation plates and a triggering mechanism. The separation plates are made of shape memory alloy material and automatically extend at a tanning temperature of 35-40℃. The triggering mechanism includes a temperature sensor and a mechanical linkage rod, which automatically activates the separation plates to intervene when leather tangling is detected.

[0068] Tanning experiment:

[0069] Thirty salt-wet cowhides from the same batch, from the same location, and with similar weights (20±0.5 kg / hide) were randomly divided into three groups and tanned with the same batch of industrial-grade chromium tanning agent (basic chromium sulfate, Cr2O3 content 24%).

[0070] Control group A: Traditional unidirectional rotating wooden drum (1.8m in diameter, 3m³ in volume).

[0071] Control group B: Commercially available bidirectional rotating stainless steel vacuum drum (diameter 2.0m, volume 3.5m³, vacuum degree adjustable to -0.09 to -0.06MPa range).

[0072] Experimental group: The leather tanning device based on multi-dimensional linkage stirring as described in Example 1 of this invention (main body volume 3.2m³).

[0073] Under the same conditions of liquor ratio, chrome tanning agent dosage, temperature, and total tanning time:

[0074] Control group A was set up with equipment rotating continuously in one direction at a speed of 12 rpm under normal pressure for 8 hours;

[0075] Control group B equipment rotates alternately in both directions at a speed of 15 rpm and a constant pressure of -0.06 MPa for 8 hours;

[0076] The experimental group equipment underwent multidimensional combined motion (revolution + rotation + hammering), with a central shaft speed of 30 rpm and a periodic pressure change of -0.08 MPa for tanning for 8 hours. The results are shown in Table 1, which compares this tanning apparatus with existing equipment.

[0077]

[0078] Work process

[0079] Initial dispersion stage: Moistened, clump-like raw hides and tanning agents are put into the chamber, the vacuum system is activated to extract air, and the stirring arm starts at low speed to initially break up the leather clumps.

[0080] Active kneading stage:

[0081] The multi-dimensional mixing mechanism operates at full speed, and the mixing arm twists and throws the leather through a combination of revolution, rotation, and axial movement.

[0082] The variable volume compression system works synchronously, with the flexible bladder periodically expanding and contracting to provide volumetric massage to the leather.

[0083] The intelligent anti-tangling mechanism monitors in real time and promptly interrupts any tangling trend.

[0084] Homogenization and stabilization stage: The stirring speed is reduced and the extrusion frequency is slowed down, allowing the leather fibers to be further stabilized under low-intensity mechanical action, ensuring that the properties of the entire leather are highly consistent.

[0085] Working principle:

[0086] 1. The first drive motor 201 starts and drives the central shaft 21 to rotate.

[0087] The central shaft 21 drives the sun gear 221 and the first cam 225 to rotate synchronously. The sun gear 221 drives three planetary gears 222 to mesh and rotate within a fixed internal gear ring 223, forming a planetary gear system. This structure causes the stirring arm 24, connected to the planetary gears, to produce two motions: revolution (circular motion around the central shaft) and rotation (rotation around its own support shaft 2221). The combination of revolution and rotation causes the flexible finger clusters 242 at the end of the stirring arm to form a complex motion trajectory within the box, generating a strong pulling and mixing effect on the leather. The rotation of the first cam 225 is converted into linear reciprocating motion through the roller 2245 and the sliding block 2244, and then the connecting rod 2401 pushes the entire stirring arm 24 to reciprocate along its axis. Effect: This axial motion allows the flexible finger clusters 242 to actively penetrate and withdraw from the leather pile like "fingers," which is crucial for breaking up tight leather clumps and eliminating blind spots in tanning.

[0088] 2. The flexible finger cluster 242 is made of ultra-elastic plastic or silicone, and its unique flexibility allows it to automatically adapt to different working modes according to the rotation speed:

[0089] Low-speed mode dispersion and grasping phase:

[0090] Operating conditions: The motor is running at low speed, and the centrifugal force generated by its revolution is relatively small.

[0091] Mechanism: At this point, the flexible finger clusters 242 maintain their natural drooping state and are soft in texture. As the stirring arm revolves and rotates, these soft finger clusters can gently penetrate and insert into the gaps between the wrapped leather clumps.

[0092] Action: Combined with the axial reciprocating motion of the stirring arm, the flexible finger clusters act like countless agile fingers, "grabbing, combing, and sorting" the leather. Through continuous insertion and withdrawal, large, tangled pieces of leather are effectively separated and broken down into smaller, looser units, laying the foundation for subsequent uniform tanning while avoiding scratches on the leather surface.

[0093] High-speed mode throwing and kneading phase;

[0094] Operating conditions: The motor runs at high speed, and its revolution generates a strong centrifugal force.

[0095] Mechanism: Under the action of huge centrifugal force, the soft flexible finger clusters 242 are flung outward and taut, and their ends form a "striking surface" with considerable rigidity and linear velocity.

[0096] Action: During its revolution, the taut fingertips act like a flexible whip, "catching" the leather and accelerating it to a very high speed. Upon reaching a certain point on its trajectory, the leather is violently thrown out by inertia, impacting the inner wall of the box, the flexible cavities, or other leathers, creating a powerful "throwing" effect. This impact greatly promotes the penetration of tanning agents into the fibers and further breaks down the leather clumps.

[0097] 3. The central rotating shaft 21 drives the third cam 271 to rotate through the rotating sleeve 27, which in turn drives the hydraulic cylinder 31, causing the flexible bladder 31 to expand and contract periodically.

[0098] During expansion, uniform static pressure is applied to the leather inside the box, simulating a "massage" motion, forcing the tanning agents to flow and penetrate.

[0099] The "counter-force" kneading of the linked extrusion plate:

[0100] Driven precisely by the second drive motor 272, the rotating plate 26 rotates in sync with the stirring and revolves, driving the linkage extrusion plate 265 to rotate.

[0101] When the linkage extrusion plate 265 moves to the flexible bladder 31 position, the second slider 263 on it moves outward under the action of the second cam 225.

[0102] Synergistic effect: At this time, the flexible cavity 31 expands inward, while the linkage extrusion plate 265 moves outward, creating a "pinching" and "shearing" effect on the leather between them. The liquid permeable holes 266 and turbulence protrusions 241 on the surface of the linkage extrusion plate 265 enhance fluid exchange and surface rubbing during this process, which is highly similar to the "scuffing" mechanism of hand tanning.

[0103] 4. During this stage, the vacuum system 5 can perform periodic pressure changes (such as cycling from -0.06MPa to -0.09MPa) to drive the tanning agent to "swallow and expel" deeper between the fibers, thereby enhancing the penetration effect.

[0104] 5. Intelligent anti-tangling mechanism 4 monitors the leather condition in real time. Once a tangling trend is detected, it immediately intervenes to ensure processing continuity.

[0105] The automatic control system 6 is the brain. Based on the preset process, it intelligently controls the speed of the first drive motor 201, thereby controlling the working mode of the flexible finger cluster, the synchronization of the second drive motor 272, the working rhythm of the hydraulic system, and parameters such as vacuum degree, to achieve full-process automation from "low-speed dispersion" to "high-speed throwing" and then to "homogeneous stability".

[0106] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0107] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0108] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0109] 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 leather tanning apparatus based on multi-dimensional linkage stirring, characterized in that, include: The main body (1) has an inlet and a dosing port at the top and a drain and a discharge gate at the bottom; The multi-dimensional stirring mechanism (2) is installed inside the main body (1); The variable volume extrusion tanning system (3) is installed on the inner wall of the main body box (1). Vacuum system (5) connected to the main body (1); And an automatic control system (6) installed on the main body (1); The automatic control system (6) is used to control the multi-dimensional stirring mechanism (2), the variable volume extrusion tanning system (3) and the vacuum system (5) to work together. The multidimensional stirring mechanism (2) includes a central rotating shaft (21), a planetary gear set (22), and an eccentric oscillating component (23). The planetary gear set (22) includes a sun gear (221), planet gears (222), and an internal gear ring (223). A stirring arm (24) is connected to the planet gears (222). The eccentric oscillating component (23) is connected between the central rotating shaft (21) and the stirring arm (24) and is used to drive the stirring arm (24) to reciprocate along its axial direction.

2. The leather tanning apparatus based on multi-dimensional linkage stirring according to claim 1, characterized in that, The end of the stirring arm (24) is provided with flexible finger clusters (242), which are made of super-elastic plastic or silicone.

3. The leather tanning apparatus based on multi-dimensional linkage stirring according to claim 2, characterized in that, The eccentric oscillating assembly (23) includes a first cam (225) fixed on the central rotating shaft (21), a planetary carrier (224) connected to the planetary gear (222), a sliding block (2244) slidably disposed on the planetary carrier (224), and a connecting rod (2401) connecting the sliding block (2244) and the stirring arm (24). The sliding block (2244) is provided with a roller (2245) that contacts the first cam (225).

4. The leather tanning apparatus based on multi-dimensional linkage stirring according to claim 3, characterized in that, The variable volume extrusion tanning system (3) includes a flexible cavity (31) installed on the inner wall of the main body (1), a hydraulic cylinder (32) for driving the flexible cavity (31), and a linkage extrusion mechanism that cooperates with the flexible cavity (31).

5. A leather tanning apparatus based on multi-dimensional linkage stirring according to claim 4, characterized in that, The linkage extrusion mechanism includes a rotating sleeve (27), a rotating plate (26) fixed on the rotating sleeve (27), a second slider (263) slidably disposed on the rotating plate (26), and a linkage extrusion plate (265) connected to the second slider (263). The linkage extrusion plate (265) is provided with a liquid permeation hole (266).

6. The leather tanning apparatus based on multi-dimensional linkage stirring according to claim 1, characterized in that, The rotating sleeve (27) is provided with a third cam (271), which abuts against the piston of the hydraulic cylinder (32).

7. A leather tanning apparatus based on multi-dimensional linkage stirring according to claim 1, characterized in that, The system also includes an intelligent anti-tangling leather separation mechanism (4) disposed on the inner wall of the main body (1). The intelligent anti-tangling leather separation mechanism (4) includes a retractable separation plate and a triggering mechanism. The retractable separation plate is made of shape memory alloy material.

8. A leather tanning apparatus based on multi-dimensional linkage stirring according to claim 1, characterized in that, The vacuum system (5) is able to periodically change the pressure in the tanning chamber within the range of -0.06MPa to -0.09MPa under the control of the automatic control system (6).

9. A leather tanning method using the leather tanning apparatus based on multi-dimensional linkage stirring as described in any one of claims 1-8, characterized in that, Includes the following stages: Initial dispersion stage: Start the vacuum system (5) and control the multi-dimensional stirring mechanism (2) to run at low speed, and use the stirring arm (24) to break up the leather; Active kneading stage: control the multi-dimensional stirring mechanism (2) to run at high speed, and at the same time start the variable volume extrusion tanning system (3) to knead and extrude the leather; Homogenization and stabilization stage: Reduce the rotation speed of the multi-dimensional stirring mechanism (2) and the working frequency of the variable volume extrusion tanning system (3) to stabilize the leather fibers.

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