A leather substrate hot drying and stretching device

Abstract

The present application relates to a leather substrate heat drying and stretching device, belonging to the field of leather production and manufacturing, which includes a frame, an oven and an stretching mechanism, the stretching mechanism including a base sprocket, an extension sprocket, an extension chain and a pressure roller, a plurality of extension needle plates connected to the extension chain, the surface of the pressure roller abuts the surface of the base on the side away from the extension needle plate, a plurality of needles fixedly connected to the extension needle plate, and the needles pass through the base at the side edge of the base; two extension chains are provided and are respectively located on opposite sides of the base, the extension sprocket is rotatably arranged in the oven, the extension sprocket is engaged with the extension chain, the extension sprocket and the base sprocket are respectively located on opposite sides of the extension chain, and in the direction of movement along the base, the extension chain between the base sprocket and the extension sprocket gradually moves away from the middle of the base along the width direction of the base. The base is stretched by pulling the base through the stretching mechanism, so that the base is actively deformed to the target width, improving the controllability of the base's thermal deformation and facilitating subsequent processing.

Description

Technical Field

[0001] The present application relates to the field of leather production and manufacturing, and in particular to a leather substrate thermal drying and stretching device. Background Art

[0002] Leather is a denatured, non-perishable animal hide obtained through physical and chemical processes such as dehairing and tanning. Leather is composed of natural protein fibers tightly woven in three dimensions. Its surface features a unique grain pattern, a natural sheen, and a pleasant feel. Leather can be categorized by manufacturing method as genuine leather, artificial leather, or synthetic leather.

[0003] Artificial leather is a general term for man-made materials such as PVC and PU. It is made by foaming or laminating various formulations of PVC and PU onto a textile or non-woven base. Leather base (substrate) refers to a semi-finished leather product made by impregnating the surface of the base fabric with a layer of polyurethane resin. In artificial leather, this generally refers to wet-process base, which is formed by applying a layer of PU to the surface of the base fabric through a wet process. Base is an intermediate product that requires a dry process and subsequent finishing steps before it can be made into a finished product. The production process of base includes the following steps: impregnation of non-woven fabric, pre-coagulation, sizing, coagulation, washing, heat drying, and polishing. The equipment used for heat drying is an oven, and the base passes through the oven, where it is exposed to heat radiation.

[0004] Since the raw materials are easily deformed during the washing and drying processes in the above process, the width of the bass material after drying will face great uncertainty, which is not conducive to the smooth progress of the subsequent manufacturing process. Summary of the Invention

[0005] In order to improve the above problems, the present application provides a leather substrate thermal drying and stretching device.

[0006] The present application provides a leather substrate thermal drying and stretching device that adopts the following technical solutions:

[0007] A leather substrate heat drying and stretching device, comprising a frame, a drying oven provided on the frame, a heat drying channel provided on the drying oven for the leather to pass through, a stretching mechanism provided on the frame, the stretching mechanism comprising a base sprocket, an extension sprocket, an extension chain and a pressure roller, the base sprocket being rotatably connected to the frame, the extension chain being meshed with the base sprocket, a plurality of extension needle plates being connected to the extension chain, the pressure roller being rotatably connected to the frame, the surface of the pressure roller being in contact with the side of the leather facing away from the extension needle plate The surfaces are abutted, and a plurality of needles are fixedly connected to the extension needle plate, and the needles pass through the base at the side edge of the base; the extension chain is provided with two and is respectively located on the opposite sides of the base, and the extension sprocket is rotatably set in the oven, and the extension sprocket is engaged with the extension chain, and the extension sprocket and the base sprocket are respectively located on the opposite sides of the extension chain, and in the direction of movement along the base, the extension chain from the base sprocket to the extension sprocket gradually moves away from the middle of the base along the width direction of the base.

[0008] By adopting the above technical solution, the width of the bass before entering the oven is smaller than the expected width. In the oven, the extension chain expands outward, and the bass is pulled to extend in width by the extension needle plate and the needle. With the help of heat radiation, the bass is actively deformed to the target width, which improves the controllability of the bass's thermal deformation and facilitates subsequent processing.

[0009] Preferably, the pressing roller is divided into a burr portion and a smooth portion along the axial direction, and a plurality of pressure pieces are fixedly connected to the burr portion. The pressure pieces apply pressure to the bass toward the extended needle plate, and the pressure pieces are elastic.

[0010] By adopting the above technical solution, when the bass passes through the pressure roller, it is subjected to pressure from the pressure roller, and the pressure roller presses the bass toward the extended needle plate. The needles on the extended needle plate can then pass through the bass, so that the edge of the bass is laterally fixed by the extended needle plate.

[0011] Preferably, the extension mechanism also includes a retraction sprocket, which is rotatably connected to the oven and meshes with the extension chain. The retraction sprocket is located on one side of the extension sprocket along the moving direction of the bass, and the retraction sprocket and the extension sprocket are respectively located on opposite sides of the extension chain. In the direction of movement along the bass, the extension chain from the extension sprocket to the retraction sprocket gradually approaches the middle of the bass along the width direction of the bass. In the direction along the width of the bass, the distance from the base sprocket to the extension sprocket of the extension chain is greater than the distance from the extension sprocket to the retraction sprocket.

[0012] By adopting the above technical solution, the extension sprocket first expands the bass to a size larger than the target size, and the retraction sprocket then controls the extension chain and the extension needle plate to carry the edge of the bass back to the target size. The cooperation between the extension sprocket and the retraction sprocket is intended to reduce the residual stress on the bass.

[0013] Preferably, an abutment wheel group is provided in the oven and between the base sprocket and the extension sprocket, and between the extension sprocket and the retraction sprocket. The abutment wheel group includes a plurality of contact wheels. The contact wheels rotate relative to the oven, and the rotation axis is parallel to the axis of the extension sprocket. The contact wheels and the extension sprocket are located on the same side of the extension chain, and the wheel surface of the contact wheels abuts against the extension chain.

[0014] By adopting the above technical solution, the contact wheel is used to apply abutting support force to the extension chain, so as to reduce the deformation of the extension chain caused by the reaction tension from the bass.

[0015] Preferably, the extension needle plate is hinged to the extension chain, and the hinge axis is parallel to the trajectory of the extension chain. In a natural state, the plate surface of the extension needle plate is parallel to the surface of the bass. A tensioning rod is provided on the side of the extension needle plate away from its own hinge axis, and the length direction of the tensioning rod is parallel to the length direction of the extension chain. The extension mechanism also includes a control member for controlling the extension needle plate to rotate toward the side close to the bass.

[0016] By adopting the above technical solution, in the process of the extension mechanism pulling the edge of the bass outward, the control part controls the extension needle plate to flip toward the bass at a certain angle, and the part of the bass passed by the needle is lowered relative to the top position of the tensioning rod. At the same time, the tensioning rod can abut the lower surface of the bass, thereby improving the uniformity of the distribution of tensile stress on the surface of the bass in the process of the extension mechanism pulling the edge of the bass outward.

[0017] Preferably, the tensioning rod includes a telescopic cylinder, an extension rod and a telescopic spring. The telescopic cylinder is fixedly connected to the extended needle plate. The extension rod is coaxially sleeved in the telescopic cylinder. One end of the extension rod extends from the telescopic cylinder. One end of the telescopic spring is connected to the extension rod, and the other end is connected to the telescopic cylinder.

[0018] By adopting the above technical solution, the total length of the tensioning rod can be changed through the relative sliding of the extension rod with respect to the telescopic cylinder. During the chain transmission process, the trajectory of the extended chain is constantly changing, and the gap size between each two adjacent extended needle plates is also constantly changing. When passing through the extended sprocket, the distance between the two adjacent extended needle plates becomes smaller, and the extension rods abut against each other and retract into the telescopic cylinder, which can ensure that the tensioning rod does not affect the normal operation of the extension chain.

[0019] Preferably, the extended needle plate is located between the abutment wheel group and the bass, the abutment wheel group also includes a fixed frame, the fixed frame is fixedly connected to the oven, the contact wheel is rotatably connected to the fixed frame, and the control member includes an abutment ball, which is located on the side of the extended needle plate facing the fixed frame. When the abutment ball abuts the fixed frame, the extended needle plate rotates toward the side close to the bass.

[0020] By adopting the above technical solution, when the extended needle plate moves to above the abutment wheel assembly, the relative position relationship between the fixed frame and the control member enables the extended needle plate to receive an upward thrust from the fixed frame and the control member, thereby achieving the functional purpose of the control member.

[0021] Preferably, the extended needle plate includes a main body and multiple adjustment plates, the adjustment plates are located on the side of the main body away from the abutment wheel group, the needles are fixedly connected to the adjustment plates, the adjustment plates are hinged to the main body, and the hinge axis is parallel to the bass surface, and the control member is also used to control the rotation of the adjustment plates.

[0022] Preferably, the control component also includes an adjusting block and an adjusting spring, the adjusting block is slidably connected to the main body, and the sliding direction is perpendicular to the plate surface of the extended needle plate, the abutment ball is embedded in the side of the adjusting block away from the adjusting plate, one end of the adjusting spring is connected to the adjusting block, and the other end is connected to the main body, there are two adjusting plates, and the hinge axes of the two adjusting plates are located on the side away from each other, and when the abutment ball abuts against the fixed frame, the adjusting block abuts against the adjusting plate and pushes the adjusting plate.

[0023] By adopting the above technical solution, the adjusting block is pushed upward by the vertical upward force and abuts the adjusting plate. The adjusting plate is also flipped up at a certain angle relative to the main body, and the flipping directions of the two adjusting plates are opposite. The length directions of the needles on the two adjusting plates are no longer parallel. For the bass, the two groups of needles are staggered in length direction, and the needles have a certain longitudinal limiting ability on the bass, thereby improving the fixing ability of the extended needle plate to the edge of the bass.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. Through the setting of the extension mechanism, the width of the base entering the oven is smaller than the expected width. In the oven, the extension chain expands outward, and the base is pulled to extend in width through the extension needle plate and needles. With the help of heat radiation, the base is actively deformed to the target width, which improves the controllability of the base's thermal deformation and facilitates subsequent processing;

[0026] 2. Through the setting of the retraction sprocket, the extension sprocket first expands the bass to a size larger than the target size, and the retraction sprocket then controls the extension chain and the extension needle plate to carry the edge of the bass back to the target size. The cooperation between the extension sprocket and the retraction sprocket is intended to reduce the residual stress on the bass. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the leather substrate heat drying and stretching equipment used in the embodiment of the present application.

[0028] Figure 2 It is a schematic diagram used to illustrate the working principle of the pressure roller in the embodiment of the present application.

[0029] Figure 3 It is a structural diagram used to reflect the abutment wheel set in the embodiment of the present application.

[0030] Figure 4 It is a structural diagram used to reflect the extended needle plate in a natural state in an embodiment of the present application.

[0031] Figure 5 It is a structural diagram used to reflect the embodiment of the present application when the fixed frame flips up the extended needle plate through the control member.

[0032] Explanation of the accompanying drawings: 1. Frame; 11. Oven; 12. Hot drying channel; 2. Extension mechanism; 21. Extension chain; 22. Base sprocket; 221. Sprocket No. 1; 222. Sprocket No. 2; 223. Sprocket No. 3; 23. Extension sprocket; 24. Retraction sprocket; 25. Pressure roller; 251. Burr portion; 252. Pressure piece; 253. Smooth portion; 26. Abutment wheel group; 261. Contact wheel; 262. Fixed frame; 3. Extension needle plate; 31. Main body; 32. Adjustment plate; 33. Needle; 34. Tensioning rod; 341. Telescopic cylinder; 342. Extension rod; 343. Telescopic spring; 35. Control part; 351. Adjustment block; 352. Adjustment spring; 353. Abutment ball; 4. Bass. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] The present application embodiment discloses a leather substrate heat drying and stretching device, such as Figure 1 As shown, the machine comprises a frame 1, on which is mounted an oven 11 and an extension mechanism 2. The oven 11 has a built-in heating device and a hot drying passage 12 for the bass 4 to pass through. The extension mechanism 2 is used to extend and deform the bass 4 in its width direction as it passes through the oven 11.

[0035] like Figure 1As shown, the extension mechanism 2 includes a base sprocket 22, an extension sprocket 23, a retraction sprocket 24 and an extension chain 21. The base sprocket 22 includes a first sprocket 221, a second sprocket 222 and a third sprocket 223, all of which are rotatably connected to the frame 1. The extension sprocket 23 and the retraction sprocket 24 are located in the hot drying channel 12 and are rotatably connected to the drying oven 11. The rotation axes of all sprockets are vertical straight lines. Along the direction of travel of the bass 4, the first sprocket is connected to the first sprocket. The extension chain 21 passes through and meshes with the sprockets in the following order: the first sprocket 221, the second sprocket 222, the extension sprocket 23, the retraction sprocket 24, and the third sprocket 223. The extension chain 21 is wound around each sprocket in sequence, meshing with them. The winding order is the first sprocket 221, the second sprocket 222, the extension sprocket 23, the retraction sprocket 24, the third sprocket 223, and the first sprocket 221. The extension sprocket 23 is located on the outer edge of the extension chain 21, while the remaining sprockets are located on the inner edge of the extension chain 21. There are two chain transmission mechanisms consisting of the extension chain 21 and the sprockets, one located on opposite sides of the bass 4. The lengths of the extension chain 21 between the first sprocket 221 and the second sprocket 222, between the retraction sprocket 24 and the third sprocket 223, and between the third sprocket 223 and the first sprocket 221 are all parallel to the travel direction of the bass 4. In the direction of movement along the bass 4, the extension chain 21 from the second sprocket 222 to the extension sprocket 23 gradually moves away from the middle of the bass 4 along the width direction of the bass 4, and the extension chain 21 from the extension sprocket 23 to the retraction sprocket 24 gradually approaches the middle of the bass 4 along the width direction of the bass 4. In the direction along the width of the bass 4, the distance of the extension chain 21 from the second sprocket 222 to the extension sprocket 23 is greater than the distance from the extension sprocket 23 to the retraction sprocket 24, that is, in the process from the second sprocket 222 to the retraction sprocket 24, the extension chain 21 first moves away from the middle of the bass 4 and then approaches the middle of the bass 4, but the overall displacement direction is away from the middle of the bass 4.

[0036] like Figure 1 and 2As shown, the extension mechanism 2 also includes an extension needle plate 3 and a pressure roller 25. Multiple extension needle plates 3 are provided, each connected to the outer edge of the extension chain 21 and evenly arranged along the chain's trajectory. The extension needle plates 3 are equipped with multiple needles 33, which can pierce the edge of the bass 4, thereby securing the bass 4 laterally relative to the base. The extended needle plate 3 is located below the base 4, the needle tip of the needle 33 is facing upward, and the pressure roller 25 is located above the base 4, which is used to apply a downward thrust to the base 4; the pressure roller 25 is rotatably connected to the frame 1, and the rotation axis is parallel to the width direction of the base 4. It is divided into a burr portion 251 and a smooth portion 253 along its own axial direction. The smooth portion 253 is closer to the middle position in the width direction of the base 4, and the burr portion 251 is opposite to the extended needle plate 3 with respect to the base 4; the radial dimension of the burr portion 251 is smaller than the radial dimension of the smooth portion 253, and a plurality of elastic pressure pieces 252 are fixedly connected to the circumferential surface of the burr portion 251. In this embodiment, the pressure piece 252 is made of plastic bristles. There are two pairs of pressure rollers 25, which are respectively located between the No. 1 sprocket 221 and the No. 2 sprocket 222 and between the retraction sprocket 24 and the No. 3 sprocket 223. When the base 4 is continuously moving, the pressure rollers 25 exert downward pressure on the base 4, causing the base 4 to lower its position. At this time, each needle 33 can penetrate the base 4 and insert into the gap between the bristles.

[0037] like Figure 1 and 3 As shown, when the extended needle plate 3 carries the bass 4 and moves between the second sprocket 222 and the extended sprocket 23 and between the extended sprocket 23 and the retraction sprocket 24, due to the change in the lateral position of the sprocket, the extended needle plate 3 applies a pulling force to the bass 4 through the needle 33, which first gradually increases and then gradually decreases. An abutment wheel group 26 is provided in the oven 11 and between the second sprocket 222 and the extension sprocket 23, and between the extension sprocket 23 and the retraction sprocket 24. The abutment wheel group 26 includes a fixed frame 262 and a plurality of contact wheels 261. The fixed frame 262 is fixedly connected to the oven 11, and the contact wheels 261 are rotatably connected to the fixed frame 262. The rotation axis of the contact wheels 261 is parallel to the axis of the extension sprocket 23, and the wheel surface of each contact wheel 261 abuts against the outer edge side of the extension chain 21. The contact wheels 261 are used to apply abutment support force to the extension chain 21, so as to reduce the deformation of the extension chain 21 caused by the reaction tension from the bass 4.

[0038] like Figure 1 and 3As shown, one side of the extended needle plate 3 is hinged to the extended chain 21, and the hinge axis is parallel to the trajectory of the extended chain 21. In the natural state, the plate surface of the extended needle plate 3 is parallel to the surface of the bass 4, both of which are horizontal planes. The bass 4 and the needle 33 are both located above the extended needle plate 3, and the abutment wheel group 26 is located below the extended needle plate 3. A tensioning rod 34 is provided on the side of the extended needle plate 3 away from its own hinge axis. The length direction of the tensioning rod 34 is parallel to the length direction of the extended chain 21. The upper edge of the tensioning rod 34 is higher than the plate surface of the extended needle plate 3. A single tensioning rod 34 includes a telescopic cylinder 341, two extension rods 342 and two telescopic springs 343. The telescopic cylinder 341 is fixedly connected to the extended needle plate 3, the extension rod 342 is coaxially sleeved in the telescopic cylinder 341, the telescopic spring 343 is located in the telescopic cylinder 341, and the single extension rod 342 is located at one of the cylinder mouths of the telescopic cylinder 341. One end of the extension rod 342 extends from the telescopic cylinder 341, and the other end is fixedly connected to one end of the telescopic spring 343. The other end of the telescopic spring 343 is fixedly connected to the telescopic cylinder 341. In a natural state, if the length directions of the tensioning rods 34 on two adjacent extended needle plates 3 are parallel, the end of the extension rod 342 of one tensioning rod 34 close to the other tensioning rod 34 contacts the end of the extension rod 342 of the other tensioning rod 34, and when the extension chain 21 passes around the extension sprocket 23, the extension rods 342 on the two adjacent tensioning rods 34 will generate a mutual abutment force, and the extension rods 342 will retract into the telescopic cylinder 341.

[0039] like Figure 3 、 4As shown in Figure 5, a single extended needle plate 3 includes a main body 31 and two adjustment plates 32. The hinge axis of the extended needle plate 3 and the extended chain 21 is located on the main body 31, and the telescopic cylinder 341 is also located on the main body. The adjustment plate 32 is located on the side of the main body 31 away from the abutment wheel group 26. The needle 33 is directly fixedly connected to the adjustment plate 32. The adjustment plate 32 is hinged to the main body 31, and the hinge axis is parallel to the length direction of the tensioning rod 34. The hinge axes of the two adjustment plates 32 are located on the side away from each other. In the natural state, the plate surface of the adjustment plate 32 is perpendicular to the axis of each sprocket, and the needle 33 is perpendicular to the plate surface of the adjustment plate 32. The extension mechanism 2 also includes a control member 35 for controlling the body 31 of the extension needle plate 3 and the adjustment plate 32 to rotate toward the side close to the bass 4. The control member 35 includes an adjustment block 351, an adjustment spring 352 and an abutment ball 353. The adjustment block 351 is slidably connected to the body 31, and the sliding direction is perpendicular to the plate surface of the extension needle plate 3. The abutment ball 353 is embedded in the side of the adjustment block 351 away from the adjustment plate 32. One end of the adjustment spring 352 is connected to the adjustment block 351, and the other end is connected to the body 31. In the natural state, the adjustment block 35 1 does not contact the adjustment plate 32. However, when the extension needle plate 3 is positioned above the abutment wheel assembly 26, the abutment ball 353 contacts the upper surface of the fixed frame 262. The adjustment block 351 is pushed vertically upward, moving upward and abutting the adjustment plate 32. The body 31, pushed upward by the adjustment block 351, then tilts upward. At this point, the body 31 tilts upward by a certain angle relative to the extension chain 21, and the adjustment plate 32 also tilts upward by a certain angle relative to the body 31. The two adjustment plates 32 tilt in opposite directions, and the lengths of the needles 33 on the two adjustment plates 32 are no longer parallel. For the base 4, the two sets of needles 33, due to their staggered lengths, provide a certain longitudinal positioning capability. At the same time, the tensioning rod 34 tightly abuts the lower surface of the base 4, improving the uniformity of the tensile stress distribution on the surface of the base 4 during the process of the extension mechanism 2 pulling the edge of the base 4 outward.

[0040] The implementation principle of the leather substrate heat drying and stretching device in the embodiment of the present application is as follows:

[0041] After the base 4 moves to the pressure roller 25, it is subjected to pressure, and the needle 33 passes through the edge of the base 4. The extended needle plate 3 can be fixed relatively to the edge of the base 4 in the horizontal direction. The direction of the extended chain 21 in the oven 11 enables the extension mechanism 2 to control the base 4 to expand and retract in sequence. The width of the base 4 after leaving the oven 11 becomes wider than before entering the oven 11, that is, the width extension of the base 4 is realized. By controlling the directional deformation of the base 4, the irregular deformation of the base 4 during the hot drying process is reduced.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A leather substrate heat drying and stretching device, comprising a frame (1), a drying oven (11) provided on the frame (1), a heat drying channel (12) provided on the drying oven (11) for a leather base (4) to pass through, characterized in that: The frame (1) is provided with an extension mechanism (2), the extension mechanism (2) includes a basic sprocket (22), an extension sprocket (23), an extension chain (21) and a pressure roller (25), the basic sprocket (22) is rotatably connected to the frame (1), the extension chain (21) is engaged with the basic sprocket (22), a plurality of extension needle plates (3) are connected to the extension chain (21), the pressure roller (25) is rotatably connected to the frame (1), the surface of the pressure roller (25) abuts against the surface of the bass (4) on the side away from the extension needle plate (3), the extension needle plate (3) is fixedly connected with a plurality of needles (33), and the needles (33) pass through the bass (4) at the side edge of the bass (4); The extension chain (21) is provided with two and is respectively located on opposite sides of the base (4); the extension sprocket (23) is rotatably arranged in the oven (11); the extension sprocket (23) is engaged with the extension chain (21); the extension sprocket (23) and the base sprocket (22) are respectively located on opposite sides of the extension chain (21); in the direction of movement along the base (4), the extension chain (21) from the base sprocket (22) to the extension sprocket (23) gradually moves away from the middle of the base (4) along the width direction of the base (4); The extension mechanism (2) further comprises a retraction sprocket (24), the retraction sprocket (24) being rotatably connected to the oven (11) and meshing with the extension chain (21), the retraction sprocket (24) being located on one side of the extension sprocket (23) along the moving direction of the bass (4), and the retraction sprocket (24) and the extension sprocket (23) being located on opposite sides of the extension chain (21), respectively; in the moving direction of the bass (4), the extension chain (21) from the extension sprocket (23) to the retraction sprocket (24) gradually approaches the middle of the bass (4) along the width direction of the bass (4), and in the direction along the width of the bass (4), the distance of the extension chain (21) from the base sprocket (22) to the extension sprocket (23) is greater than the distance from the extension sprocket (23) to the retraction sprocket (24); A contact wheel set (26) is provided in the oven (11) and between the base sprocket (22) and the extension sprocket (23) and between the extension sprocket (23) and the retraction sprocket (24). The contact wheel set (26) includes a plurality of contact wheels (261). The contact wheels (261) rotate relative to the oven (11), and the rotation axis is parallel to the axis of the extension sprocket (23). The contact wheels (261) and the extension sprocket (23) are located on the same side of the extension chain (21), and the wheel surface of the contact wheel (261) abuts against the extension chain (21). The extension needle plate (3) is hinged to the extension chain (21), and the hinge axis is parallel to the trajectory of the extension chain (21). In a natural state, the plate surface of the extension needle plate (3) is parallel to the surface of the bass (4). A tensioning rod (34) is provided on the side of the extension needle plate (3) away from its own hinge axis. The length direction of the tensioning rod (34) is parallel to the length direction of the extension chain (21). The extension mechanism (2) also includes a control member (35) for controlling the rotation of the extension needle plate (3) toward the side close to the bass (4). The tensioning rod (34) includes a telescopic cylinder (341), an extension rod (342) and a telescopic spring (343). The telescopic cylinder (341) is fixedly connected to the extended needle plate (3). The extension rod (342) is coaxially sleeved in the telescopic cylinder (341). One end of the extension rod (342) extends from the telescopic cylinder (341). One end of the telescopic spring (343) is connected to the extension rod (342) and the other end is connected to the telescopic cylinder (341).

2. The leather substrate heat drying and stretching device according to claim 1, characterized in that: The pressure roller (25) is divided into a burr portion (251) and a smooth portion (253) along the axial direction. A plurality of pressure pieces (252) are fixedly connected to the burr portion (251). The pressure pieces (252) apply pressure to the bass (4) toward the extended needle plate (3). The pressure pieces (252) are elastic.

3. The leather substrate heat drying and stretching device according to claim 1, characterized in that: The extended needle plate (3) is located between the abutment wheel group (26) and the base (4); the abutment wheel group (26) further includes a fixed frame (262); the fixed frame (262) is fixedly connected to the oven (11); the contact wheel (261) is rotatably connected to the fixed frame (262); the control member (35) includes an abutment ball (353); the abutment ball (353) is located on the side of the extended needle plate (3) facing the fixed frame (262); when the abutment ball (353) abuts against the fixed frame (262), the extended needle plate (3) rotates toward the side close to the base (4).

4. The leather substrate heat drying and stretching device according to claim 3, characterized in that: The extended needle plate (3) includes a main body (31) and a plurality of adjustment plates (32). The adjustment plates (32) are located on the side of the main body (31) away from the abutment wheel group (26). The needles (33) are fixedly connected to the adjustment plates (32). The adjustment plates (32) are hinged to the main body (31), and the hinge axis is parallel to the surface of the bass (4). The control member (35) is also used to control the rotation of the adjustment plates (32).

5. The leather substrate heat drying and stretching device according to claim 4, characterized in that: The control member (35) further comprises an adjusting block (351) and an adjusting spring (352), wherein the adjusting block (351) is slidably connected to the main body (31), and the sliding direction is perpendicular to the plate surface of the extended needle plate (3), and the abutting ball (353) is embedded in the side of the adjusting block (351) away from the adjusting plate (32), one end of the adjusting spring (352) is connected to the adjusting block (351), and the other end is connected to the main body (31), and two adjusting plates (32) are provided, and the hinge shafts of the two adjusting plates (32) are located on the side away from each other, and when the abutting ball (353) abuts against the fixed frame (262), the adjusting block (351) abuts against the adjusting plate (32) and pushes the adjusting plate (32).

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