Leather flattening and pre-stretching linkage device based on servo drive

Abstract

The application discloses a kind of leather flattening and pre-stretching linkage equipment based on servo drive, it is related to leather processing field, the present application is synchronous drive swing assembly by the rotation of compression roller, make push rod, movable rod and pull rod form continuous reciprocating transmission chain, and then drive two sides deflection arm and force arm realize symmetrical linkage, make the pull roller in flattening component automatically close and synchronous clamping leather two sides in leather running process, realize side synchronous force stretching.Through the limiting sliding fit of pull frame on the both sides of core frame, the deflection angle of deflection arm is kept consistent, which ensures the consistency of the two sides tensioning stroke from the structure, avoiding the local wave and stress concentration caused by unilateral stretching.Further, after the clamping of pull roller is completed, the tension is transmitted to the concave frame by the pull frame and the spring is compressed, so that the clamping force is self-adaptively improved with the transmission resistance, so that stable clamping pressure can be maintained under different thickness and moisture content, and the uniformity and reliability of pre-stretching are improved.

Description

Technical Field

[0001] This invention relates to the field of leather processing, and more particularly to a servo-driven leather flattening and pre-stretching linkage device. Background Technology

[0002] In leather processing, to improve the flatness and dimensional stability of the finished product, the leather usually needs to be leveled and pre-stretched before pressing and shaping. Current processes often use separate stretching and pressing mechanisms in separate steps. First, the leather is stretched at the edges using a tensioning device, then it enters the pressing rollers for pressing and shaping. However, in this type of structure, there is a lack of linkage between the stretching action and the pressing and shaping. The stretching tension is difficult to match with the pressing roller speed in real time, easily causing tension fluctuations during transmission. This leads to loose edges or localized overstretching of the leather, resulting in wrinkles, wavy edges, and uneven thickness distribution. Furthermore, existing tensioning mechanisms often use rigid tensioning structures, and the clamping force cannot be adaptively adjusted according to the leather thickness and moisture content. Frequent manual adjustments are required when processing leather of different specifications, resulting in low efficiency and poor stability. Because the stretching structures on both sides lack symmetrical synchronous control, unilateral force deviations are also prone to occur, affecting the subsequent pressing and shaping effect, thus reducing the quality of the finished product and production continuity. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of poor pretreatment effect in traditional leather processing, and to propose a servo-driven leather flattening and pre-stretching linkage device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a servo-driven leather flattening and pre-stretching linkage device, comprising a support frame, two pressure rollers mounted on the support frame, swing components mounted at both ends of the pressure rollers, two symmetrically arranged slide rail frames on both sides of the support frame, a tensioning component driven by the swing components slidably disposed in the slide rail frame, and two flattening components mounted on the tensioning component; The tensioning assembly includes two pairs of coaxially fixed deflection arms and lever arms. A tie rod is slidably provided at the end of each deflection arm, and a tie rod driven by the swing assembly is fixed at the end of each tie rod. A spring is provided on the tie rod.

[0005] As a further description of the above technical solution: the tensioning assembly also includes a recessed frame that slides on the inner wall of the slide rail frame, a core frame is fixed on the inner wall of the recessed frame, two tension frames slide against each other on both sides of the core frame, and the tension frames are provided with sliding holes for limiting the sliding of the corresponding deflection arm ends.

[0006] As a further description of the above technical solution: the swing assembly includes a swing wheel fixed to one end of the pressure roller, a push rod is eccentrically mounted on one side of the swing wheel, and the bottom end of the push rod is movably connected to a movable rod through a pin.

[0007] As a further description of the above technical solution: the end of the pull rod is provided with a universal movable ball joint that is rotatably connected to the bottom end of the movable rod, and the spring is coiled around the surface of the pull rod with its two ends fixed between the slide rail frame and the recessed frame.

[0008] As a further description of the above technical solution: the leveling component includes a wheel frame movably connected to the end of the lever arm, the wheel frame having a through hole, and a pull roller rotatably disposed on the inner wall of the through hole.

[0009] As a further description of the above technical solution: traction plates are movably connected to both sides of the core frame, and the end of the traction plate is movably connected to one end of the wheel frame to maintain the horizontal state of the wheel frame during movement.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention uses the rotation of the pressure roller to synchronously drive the swing assembly, so that the push rod, movable rod and pull rod form a continuous reciprocating transmission chain, which in turn drives the two-sided deflection arms and lever arms to achieve symmetrical linkage, so that the pull roller in the leveling assembly automatically approaches and synchronously clamps the two sides of the leather during the leather running, so as to achieve synchronous force stretching of the edges.

[0011] By using a limiting sliding fit between the tensioner and the core frame on both sides, the deflection angle of the deflection arm remains consistent, structurally ensuring consistent tensioning stroke on both sides and avoiding localized wave-like patterns and stress concentration caused by unilateral tensioning. Furthermore, after the tension roller completes clamping, the tension is transmitted from the tensioner to the concave frame and compresses the spring, causing the clamping force to adaptively increase with the transmission resistance. This maintains stable clamping pressure under different thicknesses and moisture contents, improving the uniformity and reliability of pre-tensioning.

[0012] The traction plate horizontally constrains the roller frame, ensuring the rollers remain parallel to their axes during movement and guaranteeing stable stretching direction. The overall structure achieves integrated and simultaneous leveling and pre-stretching through mechanical linkage, providing continuous and stable double-sided stretching without an independent drive source, thus improving processing efficiency and significantly enhancing leather flatness and shape consistency. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a partial perspective view of the present invention; Figure 3 This is a cross-sectional schematic diagram of the tensioning component of the present invention; Figure 4This is a partially enlarged schematic diagram of the tensioning component of the present invention.

[0014] Legend: 1. Support frame; 2. Pressure roller; 3. Swing assembly; 31. Swing wheel; 32. Push rod; 33. Movable rod; 4. Tensioning assembly; 41. Concave frame; 42. Core frame; 43. Tie rod; 44. Tie frame; 45. Sliding hole; 46. Deflection arm; 47. Lever arm; 48. Spring; 5. Leveling assembly; 51. Wheel frame; 52. Through hole; 53. Pull roller; 6. Traction plate; 7. Slide rail frame. Detailed Implementation

[0015] 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, and 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.

[0016] like Figure 1 - Figure 4 As shown, the present invention provides a leather flattening and pre-stretching linkage device based on servo drive, including a support frame 1, two pressure rollers 2 are installed on the support frame 1, and swing components 3 are installed at both ends of the pressure rollers 2. Two symmetrically arranged slide rail frames 7 are arranged on both sides of the support frame 1. A tensioning component 4 driven by the swing component 3 is slidably arranged in the slide rail frame 7. Two flattening components 5 are arranged on the tensioning component 4. The tensioning assembly 4 includes two pairs of coaxially fixed deflection arms 46 and lever arms 47. A tie rod 44 is slidably provided at the end of the deflection arm 46. A tie rod 43 driven by the swing assembly 3 is fixed at the end of the tie rod 44. A spring 48 is provided on the tie rod 43.

[0017] This solution achieves integrated processing of leather leveling and pre-stretching through the organic linkage of pressure roller 2, swing assembly 3, tensioning assembly 4, and leveling assembly 5. Automatic synchronous action is achieved without the need for an additional independent drive source during processing. The swing wheel 31 drives the push rod 32 and movable rod 33, converting the rotational motion of the pressure roller 2 into the reciprocating motion of the pull rod 43. The pull frame 44 then drives the deflection arm 46 and lever arm 47 to deflect synchronously, enabling the pull roller 53 on the wheel frame 51 to evenly clamp and stretch both sides of the leather. This achieves simultaneous force on both sides during leather transport, avoiding the wrinkles, wavy edges, and uneven thickness problems caused by traditional unilateral stretching.

[0018] Specifically, such as Figure 4As shown, the tensioning assembly 4 also includes a recessed frame 41 that slides on the inner wall of the slide rail frame 7. A core frame 42 is fixed on the inner wall of the recessed frame 41. Two tension frames 44 slide against the two sides of the core frame 42. The tension frames 44 are provided with sliding holes 45 for limiting the sliding of the end of the deflection arm 46.

[0019] The guiding design of the core frame 42 and the concave frame 41, along with the horizontal constraint of the traction plate 6 on the wheel frame 51, ensures that the pull roller 53 maintains parallel axis during movement, avoiding swaying and localized stress concentration, thereby improving the leveling accuracy and thickness uniformity of the leather. The overall solution is compact, reliable in transmission, and highly efficient, significantly shortening the processing cycle while ensuring excellent results in thickness distribution, flatness, and dimensional stability of the finished leather product, providing a stable and efficient processing method for high-quality leather production.

[0020] The recessed frame 41 is arranged along the length of the slide rail frame 7 and forms a linear guide fit with the inner wall of the slide rail frame 7, thereby limiting the recessed frame 41 to linear displacement only along the leather transmission direction. A core frame 42 is bolted to the inner wall of the recessed frame 41. The core frame 42 is located in the middle of the recessed frame 41 and is arranged vertically, providing a symmetrical guide reference for the two pull frames 44. The two pull frames 44 slide against each other on both sides of the core frame 42, with a surface contact sliding structure between the pull frames 44 and the core frame 42 to improve stress stability and avoid swaying. A sliding hole 45 is provided on the pull frame 44 for limiting the sliding of the end of the deflection arm 46. The sliding hole 45 extends along the length of the pull frame 44, and the end of the deflection arm 46 is inserted into the sliding hole 45. When the pull frame 44 moves, the sliding hole 45 achieves stroke limitation and directional constraint, allowing the deflection arm 46 to deflect synchronously within a specified angle range, thereby ensuring consistent movement of the two lever arms 47.

[0021] Specifically, such as Figure 2 As shown, the swing assembly 3 includes a swing wheel 31 fixed to one end of the pressure roller 2. A push rod 32 is eccentrically mounted on one side of the swing wheel 31. The bottom end of the push rod 32 is movably connected to a movable rod 33 via a pin.

[0022] The balance wheel 31 is coaxially fixedly connected to the end of the pressure roller 2, so that the balance wheel 31 rotates synchronously when the pressure roller 2 rotates. A push rod 32 is eccentrically mounted on one side of the balance wheel 31. The rotation center of the push rod 32 is offset relative to the center of the balance wheel 31, thus converting the circular motion of the balance wheel 31 into the reciprocating linear motion of the push rod 32. A movable rod 33 is movably connected to the bottom end of the push rod 32 via a pin. The pin is located in a connecting hole at the bottom end of the push rod 32, allowing the movable rod 33 to swing around the pin. This achieves angle compensation during the reciprocating motion of the push rod 32, ensuring smooth and continuous power transmission and reducing lateral stress caused by motion deviation.

[0023] Specifically, such as Figure 3As shown, the end of the pull rod 43 is provided with a universal movable ball joint that is rotatably connected to the bottom end of the movable rod 33, and the spring 48 is spirally wound around the surface of the pull rod 43, with its two ends fixed between the slide rail frame 7 and the recessed frame 41.

[0024] The omnidirectional movable ball joint includes a ball head and a ball seat. The ball head is fixed to the end of the pull rod 43, and the ball seat is connected to the bottom end of the movable rod 33. This allows the pull rod 43 to generate slight oscillation compensation in multiple directions during reciprocating motion, thereby avoiding jamming due to installation errors. The spring 48 is spirally wound on the surface of the pull rod 43. Its inner diameter is larger than the outer diameter of the pull rod 43 and it is sleeved on the outside of the pull rod 43. The two ends of the spring 48 are respectively fixed between the slide rail frame 7 and the recessed frame 41. When the recessed frame 41 is moved by tension, it compresses the spring 48. The spring 48 generates a reverse elastic force to adjust the clamping pressure between the pull frame 44 and the pull roller 53, so that the tension force can be adaptively adjusted according to the change of leather resistance.

[0025] Specifically, such as Figure 2 As shown, the leveling assembly 5 includes a wheel frame 51 that is movably connected to the end of the lever arm 47. The wheel frame 51 has a through hole 52, and a pull roller 53 is rotatably disposed on the inner wall of the through hole 52.

[0026] The wheel frame 51 is connected to the end of the lever arm 47 via a pin, allowing the wheel frame 51 to swing at a small angle around the connection point to adapt to changes in leather thickness. A through hole 52 is provided on the wheel frame 51, extending along its width. A pull roller 53 is rotatably mounted on the inner wall of the through hole 52, supported by bearings within the through hole 52, allowing it to rotate freely with the movement of the leather. The outer surface of the pull roller 53 is a smooth cylindrical surface, used to provide uniform contact pressure when clamping both sides of the leather and to reduce frictional resistance during stretching.

[0027] Specifically, such as Figure 1 As shown, traction plates 6 are movably connected to both sides of the core frame 42, and the end of the traction plate 6 is movably connected to one end of the wheel frame 51 to maintain the horizontal state of the wheel frame 51 during movement.

[0028] One end of the traction plate 6 is connected to the core frame 42 via a pin, and the other end is movably connected to one end of the wheel frame 51, thus forming a three-point linkage support structure when the wheel frame 51 moves with the lever arm 47. The constraint of the traction plate 6 keeps the axis of the wheel frame 51 horizontal during the opposite movement, prevents the pull roller 53 from tilting, ensures that the clamping positions of the pull rollers 53 on both sides are symmetrical and consistent, and improves the force balance and flattening effect of the leather edge.

[0029] When this solution is in use, as the leather is pulled and transmitted through the two pressure rollers 2, the pressure rollers 2 rotate and the swing wheels 31 at both ends start to rotate synchronously. When the swing wheels 31 rotate, they drive the push rod 32 to reciprocate. The push rod 32 drives the bottom movable rod 33 to move. The bottom end of the movable rod 33 is connected to the pull rod 43 through the universal movable ball joint to reciprocate. When the pull rod 43 reciprocates, it first applies a pulling force to the two pull frames 44. The two pull frames 44, through the sliding hole 45, pull the deflection arms 46 on both sides to deflect synchronously in opposite directions. When the two deflection arms 46 deflect, they coaxially drive the lever arms 47 on both sides to deflect. The two lever arms 47 synchronously drive the wheel frames 51 on both sides to move in opposite directions until the pull rollers 53 on the wheel frames 51 clamp the two sides of the leather. At this time, the pull frame 44 acting on the pull rod 43 can no longer move, so that its pulling force is transmitted to the concave frame 41. The concave frame 41 compresses the spring 48 as the pulling force increases, which increases the clamping force of the two pull rollers 53. At the same time, the pull rollers 53 move to one side, and the leather is clamped on both sides and pulled to both sides. The stretched leather is kept in a stretched state and rotates with the pull rollers 53. Then it enters the pressure roller 2 to be shaped under pressure, and after squeezing, it continues to be pulled a second time.

[0030] This method enables the leveling and pre-stretching of leather, resulting in high efficiency and stable processing quality.

[0031] 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 servo-driven leather smoothing and pre-stretching linkage device, comprising a support frame (1), characterized in that: Two pressure rollers (2) are installed on the support frame (1). Swing components (3) are installed at both ends of the pressure rollers (2). Two symmetrically arranged slide rails (7) are provided on both sides of the support frame (1). A tensioning component (4) driven by the swing component (3) is slidably arranged inside the slide rail (7). Two leveling components (5) are provided on the tensioning component (4). The tensioning assembly (4) includes two pairs of coaxially fixed deflection arms (46) and lever arms (47). A tie rod (44) is slidably provided at the end of the deflection arm (46). A tie rod (43) driven by the swing assembly (3) is fixed at the end of the tie rod (44). A spring (48) is provided on the tie rod (43).

2. The servo-driven leather smoothing and pre-stretching linkage device according to claim 1, characterized in that, The tensioning assembly (4) also includes a recessed frame (41) that slides on the inner wall of the slide rail frame (7). A core frame (42) is fixed on the inner wall of the recessed frame (41). Two tension frames (44) slide against the two sides of the core frame (42). The tension frames (44) are provided with sliding holes (45) for limiting the sliding of the end of the deflection arm (46).

3. The servo-driven leather smoothing and pre-stretching linkage device according to claim 1, characterized in that, The swing assembly (3) includes a swing wheel (31) fixed to one end of the pressure roller (2), and a push rod (32) is eccentrically mounted on one side of the swing wheel (31). The bottom end of the push rod (32) is movably connected to a movable rod (33) via a pin.

4. The servo-driven leather smoothing and pre-stretching linkage device according to claim 3, characterized in that, The end of the pull rod (43) is provided with a universal movable ball joint that is rotatably connected to the bottom end of the movable rod (33). The spring (48) is spirally wound around the surface of the pull rod (43), and its two ends are fixed between the slide rail frame (7) and the recess frame (41).

5. A servo-driven leather smoothing and pre-stretching linkage device according to claim 2, characterized in that, The leveling assembly (5) includes a wheel frame (51) movably connected to the end of the lever arm (47), and a through hole (52) is provided on the wheel frame (51). A pull roller (53) is rotatably provided on the inner wall of the through hole (52).

6. The servo-driven leather smoothing and pre-stretching linkage device according to claim 5, characterized in that, The core frame (42) is movably connected to two sides of a traction plate (6), and the end of the traction plate (6) is movably connected to one end of the wheel frame (51) to maintain the horizontal state of the wheel frame (51) during movement.

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