Embossing device and leather production system comprising same

Abstract

The utility model discloses an embossing device and a leather production system comprising the same. The embossing device comprises a pressing roller; an embossing roller; a cooling area is arranged between the vacuum roller and the embossing roller; a cooling roller; a detection device; the embossing device can be switched from the second state to the first state or from the third state to the first state; in the first state, the detection device detects that the height of the sheet stock in the cooling area is a preset height; in the second state, the detection device detects that the height of the sheet materials is smaller than the preset height, the pressing roller conveys the sheet materials at the first speed, the vacuum roller and the cooling roller convey the sheet materials at the second speed, and the first speed is smaller than the second speed; in the third state, the detection device detects that the height of the sheet materials is larger than the preset height, the pressing roller conveys the sheet materials at a third speed, the vacuum roller and the cooling roller convey the sheet materials at a fourth speed, and the third speed is larger than the fourth speed. The leather embossing tightness detection device can automatically detect the tightness in the leather embossing process, and ensures the breadth consistency of leather.

Description

Technical Field

[0001] The utility model relates to the technical field of PVC embossing equipment, in particular to an embossing device and a leather production system comprising the embossing device. Background Art

[0002] PVC leather embossing is a process of adding printed patterns to leather. During the embossing production process, the PVC leather is softened by heat and then extruded by an embossing roller and a pressing roller, so that a product with specific patterns can be formed. The embossed PVC leather can be applied to, for example, automotive interior seats.

[0003] Since the PVC leather is extruded under heated conditions, it will generate tension and be stretched, which will change the width of the PVC leather. A smaller width indicates that the PVC leather is adjusted too loosely during embossing, which is likely to wrinkle or even be scrapped. A larger width indicates that the PVC leather is adjusted too tightly and is stretched greatly. In short, both a larger or smaller width will lead to product disharmony, affect product quality and output, and cause a large width loss.

[0004] Therefore, the width adjustment of PVC leather is crucial. Usually, it is necessary to adjust the speed between the pressing roller and the cooling roller. However, at present, manual adjustment depends on manual experience, which requires high skills and experience of workers, is prone to misjudgments such as over-adjustment or improper adjustment, and the operation is relatively cumbersome. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the technical problem that the width adjustment in the existing leather embossing process is limited by manual judgment. The utility model provides an embossing device that can automatically detect the tightness state of leather during embossing and ensure the width consistency of the leather.

[0006] To solve the above technical problems, an embodiment of the utility model discloses an embossing device, comprising:

[0007] A pressing roller for conveying the sheet material;

[0008] An embossing roller for extruding the sheet material from the pressing roller;

[0009] A vacuum roller for receiving the sheet material from the embossing roller and for conveying the sheet material. There is a cooling area between the vacuum roller and the embossing roller;

[0010] A cooling roller for receiving the sheet material from the vacuum roller and for conveying the sheet material;

[0011] A detection device is arranged above the cooling area and faces the sheet material located in the cooling area;

[0012] The embossing device can be switched from the second state to the first state, or from the third state to the first state;

[0013] In the first state, the detection device detects that the height of the sheet material in the cooling area is a preset height;

[0014] In the second state, the detection device detects that the height of the sheet material in the cooling area is less than the preset height. The pressure roller conveys the sheet material at a first speed, and the vacuum roller and the cooling roller convey the sheet material at a second speed, and the first speed is less than the second speed;

[0015] In the third state, the detection device detects that the height of the sheet material in the cooling area is greater than the preset height. The pressure roller conveys the sheet material at a third speed, and the vacuum roller and the cooling roller convey the sheet material at a fourth speed, and the third speed is greater than the fourth speed.

[0016] With the above technical solution, when the embossing device is in the first state, the detection device detects that the height of the sheet material (such as PVC leather) is the preset height. At this time, the leather during the conveying process will not be stretched by the roller body and will not be too loose. Therefore, it has better width consistency, avoids width loss, and effectively guarantees the quality and output of leather products.

[0017] When the embossing device is in the second state, the detection device detects that the height of the PVC leather is less than the preset height in the first state. The first speed of the pressure roller is less than the second speed of the vacuum roller and the cooling roller. At this time, the PVC leather remains tight (that is, it will be stretched). Then, the embossing device of the embodiment of the present application can be switched from the second state to the first state. During the switching process, for example, the first speed of the pressure roller can be increased, and the second speed of the vacuum roller and the cooling roller can be decreased. Thus, when the embossing device switches from the second state to the first state, it can prevent the PVC leather from being stretched and deformed.

[0018] When the embossing device is in the third state, the detection device detects that the height of the PVC leather is greater than the preset height in the first state. The third speed of the pressure roller is greater than the fourth speed of the vacuum roller and the cooling roller. At this time, the PVC leather is in a loose state, which will cause the PVC leather to be pressed out of wrinkles during the subsequent conveying process, resulting in the direct scrapping of the product. Therefore, the embossing device of the embodiment of the present application can be switched from the third state to the first state. During the switching process, for example, the third speed of the pressure roller can be decreased, and the fourth speed of the vacuum roller and the cooling roller can be increased, so as to prevent the PVC leather from generating wrinkles.

[0019] That is to say, the speed adjustment between the pressure roller, the vacuum roller, and the cooling roller in the embossing device of the embodiment of the present application can switch the PVC leather (specifically, the part of the PVC leather in the cooling area between the pressure roller and the vacuum roller) to the first state with good conveying conditions. In this first state, the PVC leather will not be deformed due to tightness or wrinkled due to slackness.

[0020] Therefore, the embossing device of the embodiment of the present application can ensure the consistency of the width of the PVC leather, reduce the scrapping situation caused by excessive width loss, and effectively guarantee the overall quality and output of the PVC leather products.

[0021] According to another specific embodiment of the present invention, wherein: in the first state, the pressure roller conveys the sheet material at a first preset speed, and the vacuum roller and the cooling roller convey the sheet material at a second preset speed; in the second state, the first speed is less than the first preset speed, or the second speed is greater than the second preset speed; in the third state, the third speed is greater than the first preset speed, or the fourth speed is less than the second preset speed.

[0022] According to another specific embodiment of the present invention, the embossing device further includes a heating device, the heating device includes a heating unit and a heating roller group, the heating roller group is used for the sheet material to be conveyed to the pressure roller, the heating unit is arranged above the heating roller group, and is used for heating the sheet material located on the heating roller group; the detection device is arranged on the heating unit.

[0023] According to another specific embodiment of the present invention, the embossing device further includes a first motor and a second motor, the first motor is electrically connected to the pressure roller, and the second motor is electrically connected to the vacuum roller and the cooling roller; the first motor is used to drive the pressure roller to rotate at the first speed or the third speed, and is used to drive the vacuum roller and the cooling roller to rotate at the second speed or the fourth speed.

[0024] According to another specific embodiment of the present invention, the embossing device further includes a controller, the pressure roller, the embossing roller, the vacuum roller, and the cooling roller are respectively connected to the controller, and the controller is connected to the detection device.

[0025] According to another specific embodiment of the present invention, wherein: when switching from the second state to the first state, the controller is used to control the first motor and the second motor, so that the first speed of the pressure roller is greater than the second speed of the vacuum roller and the cooling roller, and the first speed is equal to the first preset speed;

[0026] When the third state switches to the first state, the controller is configured to control the first motor and the second motor such that a third speed of the pressure roller is less than a fourth speed of the vacuum roller and the cooling roller, and the fourth speed is equal to a second preset speed.

[0027] According to another specific embodiment of the present invention, a plurality of the cooling rollers are provided, and the plurality of cooling rollers are arranged at intervals.

[0028] According to another specific embodiment of the present invention, the sheet material includes PVC leather.

[0029] To solve the above technical problems, an embodiment of the present invention also discloses a leather production system, which includes the embossing device described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A perspective view showing an embossing device according to an embodiment of the present invention is shown.

[0031] Figure 2 A schematic structural view showing the embossing device according to an embodiment of the present invention in the first state is shown.

[0032] Figure 3 A schematic structural view showing the embossing device according to an embodiment of the present invention in the second state is shown.

[0033] Figure 4 A schematic structural view showing the embossing device according to an embodiment of the present invention in the third state is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following specific embodiments illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiments, it does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiments is to cover other alternatives or modifications that may be extended based on the claims of the present invention. To provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without these details. In addition, to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is habitually placed during use. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the utility model.

[0037] Terms such as "first" and "second" are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0038] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0039] To make the purpose, technical solution and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below in conjunction with the drawings.

[0040] Referring to Figure 1 , the embodiment of the present application provides a leather production system, and the leather production system includes an embossing device. First, along the Figure 1 a direction shown in, it can be seen that the embossing device successively includes a pressure roller 10, an embossing roller 20, a vacuum roller 30, and two cooling rollers 40. These five rollers are used to convey and process the sheet material (such as leather 100 made of PVC) along the a direction.

[0041] Next, in conjunction with the Figure 1 and Figure 2 shown a direction, the pressure roller 10, the embossing roller 20, the vacuum roller 30, and the cooling roller 40 will be introduced in detail in sequence.

[0042] The pressure roller 10 is used to convey the leather 100 along the Figure 1 a direction shown. That is to say, the pressure roller 10 will convey the leather 100 to the embossing roller 20. Exemplarily, the pressure roller 10 is used to receive the heated leather 100 and can cooperate with the embossing roller 20 to emboss the leather 100.

[0043] Further, when the embossing roller 20 receives the leather 100 conveyed by the pressing roller 10, the embossing roller 20 can extrude it. Exemplarily, the outer surface of the embossing roller 20 is provided with pattern protrusions or pattern grooves, so as to emboss the heated leather 100.

[0044] Further, after the above-mentioned embossing roller 20 embosses the leather 100, it will continue to convey it to the vacuum roller 30, and after the vacuum roller 30 receives the leather 100 from the embossing roller 20, it will further convey the leather 100 to the cooling roller 40.

[0045] Further, after the two cooling rollers 40 receive the leather 100 from the vacuum roller 30, they can continue to cool the leather 100 so that the leather 100 is maintained within a normal temperature range. As Figure 1 and Figure 2 shown, the two cooling rollers 40 are arranged at intervals, so that the embossed leather 100 can be cooled multiple times. However, the number of cooling rollers 40 in the embodiments of the present application is not specifically limited. For example, one, three, four or other numbers of cooling rollers 40 can also be set.

[0046] Then, the last cooling roller 40 will continue to convey the leather 100 to the next station, for example, convey it to the cutting production line or cutting equipment, and the embodiments of the present application do not limit this.

[0047] Refer to Figure 2 and in combination with Figure 1 , there is a cooling area S between the above-mentioned embossing roller 20 and the vacuum roller 30. That is to say, within the section where the leather 100 is conveyed from the embossing roller 20 to the vacuum roller 30 after being embossed, the leather 100 can be naturally cooled by itself.

[0048] Secondly, the embossing device further includes a detection device 50, and the detection device 50 is arranged above the cooling area S (i.e., in the direction indicated by Z1) along the first direction (such as the Z direction shown in Figure 2 ) and faces the leather 100 located in the cooling area S. Exemplarily, the detection device 50 is, for example, a height sensor.

[0049] Based on this, the embossing device in the embodiments of the present application can switch between the second state and the first state, or the embossing device can switch between the third state and the first state.

[0050] Refer to Figures 2 to 4 , Figure 2 Exemplarily shows a schematic structural diagram of the embossing device in the first state; Figure 3 Exemplarily shows a schematic structural diagram of the embossing device in the second state; Figure 4 Exemplarily shows a schematic structural diagram of the embossing device in the third state.

[0051] As Figure 2 shown, the embossing device is in the first state. It can be seen that the leather 100 located within the cooling area S is in a normal conveying state. That is to say, there will be no stretching or slackening phenomenon of the leather 100 between the embossing roller 20 and the vacuum roller 30. The front side of the leather 100 within the cooling area S (i.e., Figure 2 the side indicated by the a direction in Figure 2 ) is normally conveyed by the vacuum roller 30 in the a direction, and the rear side of the leather 100 within the cooling area S (i.e.,

[0052] the side indicated by the b direction in

[0053] ) is normally conveyed by the embossing roller 20 in the a direction. At this time, the detection device 50 detects that the height of the leather 100 within the cooling area S is the preset height H. Exemplarily, the preset height H is the height from the lowest point of the leather 100 in the normal conveying state to the detection device 50.

[0054] As Figure 3 shown, when the embossing device is in the second state, it can be seen that the leather 100 located within the cooling area S is in a stretched state. That is to say, the leather 100 is kept taut between the embossing roller 20 and the vacuum roller 30. At this time, the height of the leather 100 within the cooling area S is the first height h1, and the first height h1 is less than the above-mentioned preset height H. Since the leather 100 has just undergone heating and embossing and is still in the natural cooling state at this time, it will be deformed after being stretched, affecting the quality and output of the product.

[0055] Therefore, when the embossing device is in Figure 3In the second state shown, the detection device 50 detects that the first height h1 of the leather 100 in the cooling area is less than the preset height H. At this time, the pressure roller 10 conveys the leather 100 in the a direction at a first speed, while the vacuum roller 30 and the cooling roller 40 convey the leather 100 in the a direction at a second speed, and the first speed of the pressure roller 10 is less than the second speed of the vacuum roller 30 and the cooling roller 40. In this case, the first speed of the pressure roller 10 can be increased, and the second speed of the vacuum roller 30 and the cooling roller 40 can be decreased, so that the embossing device switches from this second state to Figure 2 the above-mentioned first state shown to ensure that the leather will not be stretched and deformed.

[0056] Exemplarily, in this second state, the first speed of the pressure roller 10 is less than the first preset speed of the pressure roller 10 in the first state, or the second speed of the vacuum roller 30 and the cooling roller 40 is greater than the second preset speed in the first state. Thus, the leather 100 in the second state will be in the above-mentioned stretched state. Exemplarily, when the embossing device switches from the second state to the first state, the first speed of the pressure roller 10 will be adjusted to be close to or equal to the first preset speed.

[0057] As Figure 4 shown, when the embossing device is in the third state, it can be seen that the leather 100 located in the cooling area S is in a relaxed state between the embossing roller 20 and the vacuum roller 30. At this time, the height of the leather 100 in the cooling area S is the second height h2, and the second height h2 is greater than the above-mentioned preset height H. At this time, the relatively relaxed leather 100 in the cooling area S is likely to produce wrinkles during the subsequent conveying process, which will directly lead to the scrapping of the product.

[0058] Therefore, when the embossing device is in Figure 4 the third state shown, the detection device 50 detects that the second height h2 of the leather 100 in the cooling area is greater than the preset height H. At this time, the pressure roller 10 conveys the leather 100 in the a direction at a third speed, while the vacuum roller 30 and the cooling roller 40 convey the leather 100 in the a direction at a fourth speed, and the third speed of the pressure roller 10 is greater than the fourth speed of the empty roller 30 and the cooling roller 40. In this case, the third speed of the pressure roller 10 can be decreased, and the fourth speed of the vacuum roller 30 and the cooling roller 40 can be increased, so that the embossing device can switch from this third state to Figure 2 the above-mentioned first state shown to ensure that the leather will not produce wrinkles.

[0059] Exemplarily, in this third state, the fourth speeds of the vacuum roller 30 and the cooling roller 40 are less than the second preset speeds of the vacuum roller 30 and the cooling roller 40 in the first state, or the third speed of the pressure roller 10 is greater than the first preset speed in the first state. Thus, the leather 100 in the third state will be in the above-mentioned relaxed state. Exemplarily, when the embossing device switches from the third state to the first state, the fourth speeds of the vacuum roller 30 and the cooling roller 40 will be adjusted to be close to or equal to the second preset speeds.

[0060] Reference Figures 1 to 4 , adopting the above technical solution, when the embossing device is in the first state (as Figure 2 shown), the detection device 50 detects that the height of the leather 100 is the preset height H. At this time, the leather 100 during the conveying process will not be stretched by the rollers and will not be too loose. Therefore, it has better width consistency, avoids width loss, and effectively guarantees the quality and output of leather products.

[0061] When the embossing device is in the second state (as Figure 3 shown), the detection device detects that the first height h1 of the leather 100 is less than the preset height H in the first state, and the first speed of the pressure roller 10 is less than the second speeds of the vacuum roller 30 and the cooling roller 40. At this time, the leather 100 remains tight (i.e., will be stretched). Then, the embossing device of the embodiment of the present application can switch from this second state (as Figure 3 shown) to the first state (as Figure 2 shown). During the switching process, for example, the first speed of the pressure roller 10 can be increased, and the second speeds of the vacuum roller 30 and the cooling roller 40 can be decreased. Thus, when the embossing device switches from the second state to the first state, it can prevent the leather 100 from being stretched and deformed.

[0062] When the embossing device is in the third state (as Figure 4 shown), the detection device 50 detects that the second height h2 of the leather 100 is greater than the preset height H in the first state, and the third speed of the pressure roller 10 is greater than the fourth speeds of the vacuum roller 30 and the cooling roller 40. At this time, the leather 100 is in a relaxed state, which will cause the PVC leather to be pressed out of wrinkles during the subsequent conveying process, resulting in the direct scrapping of the product. Therefore, the embossing device of the embodiment of the present application can switch from the third state (as Figure 4 shown) to the first state (as Figure 2 shown). During the switching process, for example, the third speed of the pressure roller can be decreased, and the fourth speeds of the vacuum roller 30 and the cooling roller 40 can be increased, so as to prevent the leather 100 from generating wrinkles.

[0063] That is to say, the speed adjustment between the pressure roller 10, the vacuum roller 30, and the cooling roller 40 in the embossing device according to the embodiments of the present application can switch the leather 100 (specifically, the part of the leather 100 in the cooling area between the pressure roller 10 and the vacuum roller 30) to the first state with good conveying conditions. In this first state, the leather 100 will not be deformed due to tightness or wrinkled due to slackness.

[0064] Therefore, the embossing device according to the embodiments of the present application can ensure the consistency of the width of the leather 100, reduce the scrapping situation caused by excessive width loss, and effectively guarantee the overall quality and output of the leather 100 products.

[0065] Reference Figure 1 and Figure 2 In a possible implementation manner, the embossing device according to the embodiments of the present application further includes a heating device 60.

[0066] According to the previous description, the above-mentioned pressure roller 10 is used to receive the heated leather 100, and the heating device 60 is used to heat the leather 100 before entering the pressure roller 10. The heating device 60 includes a heating unit 601 and a heating roller group 602. The heating roller group 602 is used for the leather 100 to be conveyed to the pressure roller 10, and the heating unit 601 is arranged above the heating roller group 602 and can heat the leather 100 during the conveying process through the heating roller group 602. Exemplarily, the heating unit 601 includes a plurality of heating tubes (not shown in the figure), so as to be able to heat the leather 100 on the heating roller group 602, but the heating method of the heating unit 601 is not limited in the embodiments of the present application.

[0067] Continuing to refer to Figure 1 and Figure 2 It can be seen that the above-mentioned detection device 50 in the embodiments of the present application is arranged on one side of the heating unit 601, but the specific installation position of the detection device 60 is not specifically limited in the embodiments of the present application. As long as the detection device 60 can be directed towards the position of the leather 100 between the embossing roller 20 and the vacuum roller 30, it is within the scope protected by the embodiments of the present application.

[0068] In a possible implementation manner, the embossing device further includes a first motor (not shown in the figure) and a second motor (not shown in the figure). The first motor is electrically connected to the pressure roller 10 and can drive the pressure roller 10 to rotate at the first speed in the above-mentioned second state, or the first motor can drive the pressure roller 10 to rotate at the third speed in the above-mentioned third state.

[0069] The second motor is electrically connected to the vacuum roller 30 and the cooling roller 40 and can drive the vacuum roller 30 and the cooling roller 40 to rotate at the second speed in the above-mentioned second state, or the second motor can drive the vacuum roller 30 and the cooling roller 40 to rotate at the fourth speed in the above-mentioned third state.

[0070] refer to Figures 1 to 4 In a possible embodiment, the embossing device further comprises a controller (not shown in the figure), which is, for example, a PLC programmable logic controller. Figures 2 to 4 The controller is not shown, but wiring 200 connecting the controller to the pressure roller 10 , the embossing roller 20 , the vacuum roller 30 , and the cooling roller 40 is exemplarily shown. Meanwhile, the controller is connected to the detection device 50 .

[0071] For example, when the detection device 50 detects that the leather 100 in the cooling area S is at the first height h1 (i.e. Figure 3 For example, the controller can control the first motor to increase the first speed of the pressure roller 10, and at the same time, the controller can control the second motor to reduce the second speeds of the vacuum roller 30 and the cooling roller 40, so that the leather 100 in the cooling area S is switched to the above-mentioned preset height H (i.e. Figure 2 first state shown).

[0072] For another example, the controller can control the first motor to increase the first speed of the pressure roller 10, and at the same time, the controller does not send a control signal to the second motor, that is, the second speeds of the vacuum roller 30 and the cooling roller 40 remain unchanged (at this time, the second speed is equal to the second preset speed), and the first speed gradually approaches and finally equals the first preset speed. In other words, this embodiment can also switch the leather 100 in the cooling area S to the preset height H (i.e. Figure 2 first state shown).

[0073] Exemplarily, when the detection device 50 detects that the leather 100 in the cooling area S is at the second height h2 (i.e. Figure 4 For example, the controller can control the first motor to reduce the third speed of the pressure roller 10, and at the same time, the controller can control the second motor to increase the fourth speed of the vacuum roller 30 and the cooling roller 40, so that the leather 100 in the cooling area S is switched to the above-mentioned preset height H (i.e. Figure 2 first state shown).

[0074] For another example, the controller can control the second motor to increase the fourth speed of the vacuum roller 30 and the cooling roller 40. At the same time, the controller does not send a control signal to the first motor, that is, the third speed of the pressure roller 10 remains unchanged, and the fourth speed gradually approaches and finally equals the second preset speed. In other words, the leather 100 in the cooling area S is switched to the above-mentioned preset height H (i.e. Figure 2The first state shown). Exemplarily, after the embossing device switches to the first state, the controller will respectively control the first motor to rotate at a fixed first speed or a third speed, and will control the second motor to rotate at a fixed second speed or a fourth speed.

[0075] In summary, the embossing device according to the embodiment of the present application can ensure the consistency of the width of the leather 100, reduce the scrap situation caused by excessive width loss, and effectively guarantee the overall quality and output of the leather 100 products.

[0076] Although the present invention has been illustrated and described by referring to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and detail, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An embossing device, characterized in that: include: Pressing rollers, used to convey sheets; an embossing roller for pressing the sheet from the pressing roller; a vacuum roller for receiving the sheet from the embossing roller and for conveying the sheet, wherein a cooling area is provided between the vacuum roller and the embossing roller; a cooling roller for receiving the sheet from the vacuum roller and for conveying the sheet; A detection device is disposed above the cooling area and faces the sheet material located in the cooling area; The embossing device can be switched from the second state to the first state, or from the third state to the first state; In the first state, the detection device detects that the height of the sheet in the cooling area is a preset height; In the second state, the detection device detects that the height of the sheet in the cooling area is less than the preset height, the pressing roller conveys the sheet at a first speed, and the vacuum roller and the cooling roller convey the sheet at a second speed, and the first speed is less than the second speed; In the third state, the detection device detects that the height of the sheet in the cooling area is greater than the preset height, the pressure roller conveys the sheet at a third speed, and the vacuum roller and the cooling roller convey the sheet at a fourth speed, and the third speed is greater than the fourth speed.

2. The embossing device according to claim 1, characterized in that: in: In the first state, the pressing roller conveys the sheet at a first preset speed, and the vacuum roller and the cooling roller convey the sheet at a second preset speed; In the second state, the first speed is less than the first preset speed, or the second speed is greater than the second preset speed; In the third state, the third speed is greater than the first preset speed, or the fourth speed is less than the second preset speed.

3. The embossing device according to claim 1, characterized in that: The embossing device also includes a heating device, which includes a heating unit and a heating roller group. The heating roller group is used to convey the sheet material to the embossing roller. The heating unit is arranged above the heating roller group and is used to heat the sheet material located at the heating roller group. The detection device is arranged at the heating unit.

4. The embossing device according to claim 1, characterized in that: The embossing device also includes a first motor and a second motor, the first motor is electrically connected to the pressure roller, and the second motor is electrically connected to the vacuum roller and the cooling roller; the first motor is used to drive the pressure roller to rotate at the first speed or the third speed, and is used to drive the vacuum roller and the cooling roller to rotate at the second speed or the fourth speed.

5. The embossing device according to claim 4, characterized in that: The embossing device further comprises a controller, the pressing roller, the embossing roller, the vacuum roller and the cooling roller are respectively connected to the controller, and the controller is connected to the detection device.

6. The embossing device according to claim 5, characterized in that: in: When the second state is switched to the first state, the controller is used to control the first motor and the second motor so that the first speed of the pressure roller is greater than the second speeds of the vacuum roller and the cooling roller, and the first speed is equal to a first preset speed; When the third state is switched to the first state, the controller is used to control the first motor and the second motor so that the third speed of the pressure roller is less than the fourth speeds of the vacuum roller and the cooling roller, and the fourth speed is equal to the second preset speed.

7. The embossing device according to claim 1, characterized in that: The cooling rollers include a plurality of cooling rollers, and the plurality of cooling rollers are arranged at intervals.

8. The embossing device according to claim 1, characterized in that: The sheet material includes PVC leather.

9. A leather production system, characterized in that: The leather production system comprises the embossing device according to any one of claims 1 to 8.

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