Food decal production line

Abstract

This application discloses a food decal production line, mainly addressing the technical problems of complex structure and poor reliability of existing decal equipment. Based on the special positional arrangement of the pressing unit and the dough feeding and conveying unit, and utilizing the punching holes on the dough conveyor belt, the pressing head can punch the decorative dough during the stepping process of the dough conveyor belt. After punching, the decorative dough can be directly attached to the dough to be decorated under the push of the punching blade, avoiding the risks of dough falling off and deforming during the adsorption and transfer process in existing equipment. At the same time, the decaling process is simplified, making the decaling operation more convenient and reliable.

Description

Technical Field

[0001] This application relates to the field of food processing equipment, specifically to a decal production line for food. Background Technology

[0002] Food decals are thin, decorative, flavorful, or functional sheets that are pasted or covered onto the surface of food items (such as glutinous rice balls and steamed buns) to enhance their appearance and enrich their texture. Traditional hand-made decals involve manually mixing coloring agents or flavoring ingredients with flour, kneading the dough, rolling it out into thin sheets, cutting the desired decorative shapes with knives or molds, and then manually pasting the decorative sheets onto the surface of the pastry. However, this production method is inefficient, produces uneven dough thickness, and is difficult to adapt to the needs of large-scale production.

[0003] In addition, the inventors also know of a decal production equipment consisting of a dough press, a decal applicator, and a cutting mold, such as the pastry decal forming device disclosed in CN222997289U, which includes a dough conveyor and a decal cutting and applicating mechanism; during operation, the dough conveyor transports the dough to the bottom of the mold, and then the lifting mechanism lifts the dough conveyor to drive the dough to move upward, thereby squeezing and cutting out multiple decorative decals by the cutter on the mold; then the rotating mounting plate rotates the mold with the decorative decals adsorbed by negative pressure to the top of the pastry conveyor, thereby realizing the application of multiple decorative decals to multiple pastries, and the rotating mounting plate is rotated again, and so on, so that the cutting and applicating of decals can be carried out simultaneously.

[0004] However, in the process of implementing the technical solutions in the embodiments of this application, the inventors of this application discovered that the above-mentioned technical solutions require lifting the conveyor belt to achieve contact and pressing between the conveyor belt and the die cutter head. Furthermore, the pressing and pressing of the decorative surface needs to be achieved based on the rotating mounting plate, which is complex in structure and has high equipment cost. At the same time, after the decorative surface is pressed and formed, there is a risk of it falling off and deforming during the rotation and transfer process based on the rotating mounting plate under the negative pressure adsorption of the die. Moreover, if the negative pressure is too high for thinner surface, it may cause the surface to break or deform. If the negative pressure is too low, it is difficult to effectively adsorb the surface. This makes the equipment operation complex and difficult, resulting in poor decal reliability of the equipment.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, this disclosure provides a food decal production line, which mainly solves the technical problems of complex structure and poor decal reliability of existing decal equipment.

[0007] According to one aspect of this disclosure, a food decal production line is provided, comprising a dough pressing unit, a dough feeding conveyor unit with a conveying direction perpendicular to the conveying direction of the dough pressing unit, and a pressing unit mounted above the tail of the dough feeding conveyor unit for pressing and cutting the dough output from the dough pressing unit and feeding it to the dough feeding conveyor unit for decal application; the dough feeding conveyor unit includes a dough conveyor belt, a spraying mechanism mounted sequentially above the dough conveyor belt from upstream to downstream, and a column spacing adjustment machine for adjusting the column spacing of each dough piece parallel to the dough conveying direction. The structure includes a row spacing adjustment mechanism for adjusting the row spacing between dots perpendicular to the doll conveying direction; the pressing unit includes a doll conveyor belt arranged perpendicular to the doll feeding and conveying unit, and a pressing head mounted on the doll conveyor belt at a position above the doll feeding and conveying unit; the doll conveyor belt includes a drive roller, a belt with overlapping upper and lower punch holes, and a stepper motor for driving the belt to step forward; the drive roller has several limit pins arranged in a circular array at equal intervals on both ends, and the belt has several limit holes at equal intervals on both sides that match the limit pins.

[0008] In some embodiments of this disclosure, the dough sheet pressing unit includes a dough feeding module and several stages of dough sheet pressing modules sequentially disposed downstream of the dough feeding module for gradually thinning the dough sheet.

[0009] In some embodiments of this disclosure, the dough feeding module includes a feeding hopper, a feeding roller located below the feeding hopper and including two toothed rollers with adjustable spacing, an extrusion roller located below the gap between the feeding rollers and having a pre-reserved dough exit gap with the corresponding toothed rollers, and a primary conveyor belt for receiving the dough and conveying it to the downstream pressing module; each dough pressing module includes a pressing roller with two pressing rollers having adjustable spacing, and a secondary conveyor belt located below the pressing rollers; the gap between the pressing rollers of each dough pressing module decreases sequentially from upstream to downstream.

[0010] In some embodiments of this disclosure, the spraying mechanism includes a plurality of spraying components arranged at equal intervals. Each spraying component includes a sprayer that is connected to an external water source and a nozzle that is connected to the sprayer via a water spray valve and whose nozzle faces the surface conveyor belt.

[0011] In some embodiments of this disclosure, the column spacing adjustment mechanism includes a plurality of adjustment clamps arranged at equal intervals; the adjustment clamps include two clamping plates arranged parallel to the pastry conveying direction and a clamping cylinder arranged perpendicular to the pastry conveyor belt for adjusting the distance between the two clamping plates; the row spacing adjustment mechanism includes an action plate arranged perpendicular to the pastry conveyor belt for moving along the direction perpendicular to the pastry conveyor belt and pastry baffles fixed at equal intervals to the bottom of the action plate and arranged in a one-to-one correspondence with the central axis of the adjustment clamps.

[0012] In some embodiments of this disclosure, the row spacing adjustment mechanism further includes a drive motor mounted on the pastry conveyor belt via a row spacing adjustment frame, guide columns perpendicular to the pastry conveyor belt and symmetrically arranged on both sides of the row spacing adjustment frame, two sliders fixedly connected to the action plate and respectively slidably nested outside the two guide columns, and a cam linkage assembly for transmitting the power of the drive motor to the action plate.

[0013] In some embodiments of this disclosure, the pressing head includes a fixed pressing blade and a moving pressing blade; the arrangement of the dots at the dot conveyor belt matches the blade hole at the fixed pressing blade, the blade head of the moving pressing blade, and the array of the pressing holes.

[0014] In some embodiments of this disclosure, the stamping cutter is located below the bearing section of the belt for bearing the surface and is in contact with the bearing section.

[0015] In some embodiments of this disclosure, the food decal production line further includes a control unit for controlling the synchronous stepping of the pastry conveyor belt and the dough conveyor belt.

[0016] One or more technical solutions provided in this application embodiment have at least the following technical effects or advantages: Based on the special positional arrangement of the pressing unit and the pastry feeding and conveying unit, the punching holes opened at the surface conveyor belt allow the pressing head to punch the decorative surface during the stepping process of the surface conveyor belt. After punching, the decorative surface can be directly attached to the pastry to be decorated under the push of the punching blade, avoiding the risks of surface falling off and deforming caused during the adsorption and transfer process of the decorative surface in existing equipment. At the same time, the decal application process is simplified, and the decal application operation is more convenient and reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a food decal production line according to one embodiment of this application.

[0018] Figure 2 This is a cross-sectional schematic diagram of the dough feeding module in one embodiment of this application.

[0019] Figure 3This is a cross-sectional view of the surface pressing module in one embodiment of this application.

[0020] Figure 4 This is a partial structural schematic diagram of the pressing unit and the pastry feeding and conveying unit in one embodiment of this application.

[0021] Figure 5 This is a partial structural schematic diagram of the pressing unit and the pastry feeding and conveying unit from another perspective in one embodiment of this application.

[0022] In the above figures, 1 is the dough pressing unit, 11 is the dough feeding module, 111 is the feeding hopper, 112 is the toothed roller, 113 is the extrusion roller, 114 is the primary conveyor belt, 115 is the roller slider, 116 is the horizontal adjusting rod, 12 is the dough pressing module, 121 is the pressing roller, 122 is the vertical adjusting rod, 123 is the secondary conveyor belt, 2 is the pastry material handling and conveying unit, 21 is the pastry conveyor belt, 22 is the spraying mechanism, 221 is the sprayer, 222 is the nozzle, 223 is the water spray valve, 23 is the column spacing adjustment mechanism, and 24 is the row... The distance adjustment mechanism includes: 241 (action plate), 242 (surface baffle), 243 (drive motor), 244 (guide column), 245 (slider), 246 (cam linkage assembly), 25 (adjustment fixture), 251 (clamping plate), 252 (clamping cylinder), 26 (position sensor), 3 (pressing unit), 31 (surface conveyor belt), 311 (belt belt), 312 (drive roller), 313 (stepper motor), 314 (punch hole), 315 (limit pin), 316 (limit hole), 32 (pressing head), 321 (punch fixed knife), and 322 (punch moving knife). Detailed Implementation

[0023] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] The programs involved or relied upon in the following embodiments are all conventional or simple programs in this technical field, and those skilled in the art can make conventional selections or adaptive adjustments according to specific application scenarios. Unless otherwise specified, the devices involved in the following embodiments are all conventional commercially available products.

[0025] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] To address the technical problems of complex structure and poor reliability of existing decal equipment, this example discloses a decal production line for food applications. (See attached image.) Figure 1 It includes a dough pressing unit 1 for pressing and forming a dough strip of the required thickness for decorative surface, a dough feeding unit 2 for conveying the dough pieces to be decorated, and a pressing unit 3 for pressing the dough strip conveyed by the dough pressing unit into a decorative surface and then attaching it to the corresponding surface to be decorated.

[0027] In this embodiment, the decorative dough sheet is used for stamping into strips of dough; therefore, a dough strip pressing unit 1 is provided to press the dough into strips of the required thickness. See details below. Figure 1 In this example, the dough pressing unit 1 includes a dough feeding module 11 and various dough pressing modules 12 arranged downstream of the dough feeding module 11 in a series configuration, wherein see Figure 1 In this example, a three-stage dough sheet pressing module 12 is set up to facilitate the gradual thinning of the dough sheet.

[0028] For details, see Figure 2 The diagram shows a cross-sectional view of the dough feeding module 11. In this embodiment, the dough feeding module 11 includes a feeding hopper 111 for dispensing dough, and a feeding roller is provided below the feeding hopper 111. (See attached image.) Figure 2 In this example, the feeding roller consists of two toothed rollers 112, and the teeth on the surface of the toothed rollers 112 are helical. This increases the contact between the toothed rollers 112 and the dough, thus more effectively and continuously feeding the dough into the dough feeding module 11. Below the gap between the feeding rollers, an extrusion roller 113 is provided, and a dough exit gap is left between the extrusion roller 113 and one side of the toothed roller 112. For details in this example, see [link to example]. Figure 2 The gap between the extrusion roller 113 and the toothed roller 112 on the left side of the figure is sealed by a blocking plate. A dough exit gap is left between the other side of the extrusion roller 113 and the toothed roller 112. Thus, under the extrusion and conveying action of the infeeding rollers, the dough exits from the extrusion roller 113 and... Figure 2 The dough is extruded through the gap between the toothed rollers 112 on the right side, forming a dough strip of a certain thickness. This dough strip enters the circulating primary conveyor belt 114 and is transported downstream to the dough strip pressing module for further pressing. To prevent the dough strip from sticking to the extrusion rollers 113 and 112, the dough feeding module 11 also includes scrapers tangentially arranged to the surfaces of the extrusion rollers 113 and 112, respectively. Furthermore, to adapt to different working conditions, in this embodiment, the right-side toothed roller 112 is designed to move horizontally; see details below. Figure 1The toothed roller 112 is connected to the roller slider 115 at both ends, and the dough feeding module 11 has grooves on both sides that match the roller slider 115. This allows for on-demand adjustment of the horizontal position of the toothed roller 112 via the horizontal adjusting rod 116 connected to the roller slider 115. Figure 2 The position of the right toothed roller 112 is adjusted to control the amount of dough entering the dough feeding module 11. The gap between the extrusion roller 113 and the right toothed roller 112 also changes synchronously, thus achieving preliminary adjustment of the thickness of the dough output from the dough feeding module 11.

[0029] The dough strip output from the primary conveyor belt of the dough feeding module 11 is relatively thick, which does not meet the thickness requirements of the decorative dough. Therefore, in this embodiment, a multi-stage dough strip pressing module 12 is set to gradually compress the dough strip thickness. See details below. Figure 3 The cross-sectional view of the dough sheet pressing module 12 shown indicates that the dough sheet pressing module 12 includes pressing rollers, which are composed of two pressing rollers 121 with adjustable spacing. Specifically, in this example, they are relatively fixed. Figure 3 The dough pressing roller 121 shown in the lower position can be vertically adjusted in the vertical direction. Its adjustment structure is similar to the horizontal adjustment structure of the toothed roller 112 of the dough feeding module 11 mentioned above, and will not be described again in this example. This is achieved by the vertical adjustment rod 122. Figure 3 Adjusting the position of the pressing roller 121 at the upper middle position allows for adjustment of the gap between the pressing rollers, thereby adjusting the pressing thickness of the dough strip. Similarly, to prevent dough residue from remaining at the pressing rollers, two scrapers are arranged tangentially to the two pressing rollers 121. In addition, a secondary conveyor belt 123 is provided below the pressing rollers to transport the dough strip downstream.

[0030] Since the required thickness of the decorative surface skin in this example is relatively thin, it cannot be pressed into shape in one go by a single surface pressing module 12. Therefore, a three-stage surface pressing module 12 is set up, and the gap between the pressing rollers of the three-stage surface pressing module 12 is gradually reduced to achieve the effect of gradually thinning the surface skin.

[0031] The secondary conveyor belt of the final-stage surface pressing module outputs a surface strip of the required thickness, which is then further pressed into the desired decorative surface by the pressing unit 3. See details below. Figure 4 In this embodiment, the pressing unit 3 includes a surface conveyor belt 31 arranged parallel to the running direction of the surface pressing unit 1. To avoid the problem in existing equipment where the pressing and pasting of decorative surface panels requires the use of rotating mounting discs and other equipment components, which increases the complexity of the production line structure and reduces the reliability of decorative surface panel pasting, in this embodiment, see... Figure 4The conveyor belt 31 includes a belt 311, which is driven by a drive roller 312. The drive roller 312 is powered by a stepper motor 313 and drives the belt 311 to step forward. Thus, under the drive of the stepper motor 313, the belt 311 carries the dough output by the dough pressing unit 1, and then the pressing head 32 performs a stamping operation on the dough to obtain decorative dough.

[0032] To avoid the need for rotating and applying the decorative surface after the pressing head 32 has formed the decorative surface, as is done in existing equipment, this example adopts a technical concept of directly applying the decorative surface at the desired location after pressing. Specifically, under this technical concept, during the forming operation of the decorative surface, the belt 311 moves with the belt, which will interfere with the direct application of the decorative surface. Therefore, see [link to relevant documentation]. Figure 4 In this example, several punching holes 314 are arranged in an equally spaced array at the belt 311. Specifically, the punching holes 314 are distributed in rows and columns with equal spacing in the column direction parallel to the belt running direction and in the row direction perpendicular to the belt running direction. By matching the length of the belt 311 with the diameter of the drive roller 312, the punching holes 314 on both sides of the belt 311 are aligned and overlapped at any step end time. This allows the decorative surface material stamped by the pressing head 32 to pass through the belt 311 and be attached to the corresponding surface material conveying unit 2 below it.

[0033] In this case, because the belt 311 itself cannot withstand the vertical force perpendicular to the surface belt when the pressing head 32 presses the surface belt, the belt 311 deforms and bends, resulting in the decorative surface skin not being accurately formed. Therefore, in this embodiment, see... Figure 5 The view of the belt is omitted. The pressing head 32 includes a fixed punch 321 and a moving punch 322. In this example, the fixed punch 321 is specifically a blade plate with several punch holes. The moving punch 322 includes several cutter heads that correspond one-to-one with the punch holes of the fixed punch 321. In addition, the distribution of the punch holes of the fixed punch 321 matches the array of punch holes 314 of the belt 311. Thus, after each step of the belt, the cutter heads of the moving punch 322, the corresponding punch holes of the fixed punch 321, and the corresponding punch holes 314 of the belt 311 are distributed along the same vertical axis. Furthermore, the bearing section of the belt 311 used to carry the surface tape is placed between the stamping fixed knife 321 and the stamping moving knife 322, and the stamping fixed knife 321 provides the belt with support force during the stamping operation. This allows the stamped decorative surface tape to pass smoothly through the stamping hole 314 to the surface point conveyed below for application, and the stamping fixed knife 321 provides support to prevent the belt 311 from bending under force.

[0034] Furthermore, considering that the transmission between the belt 311 and the drive roller 312 relies on the friction between them, there is a risk of slippage. This can cause a difference between the actual stepping distance of the belt 311 and the designed stepping distance, resulting in the stamping hole 314, the cutting hole of the stamping fixed blade 321, and the cutting head of the stamping moving blade 322 not being on the same vertical axis, leading to subsequent failure of decorative surface adhesion. Therefore, in this embodiment, several limiting pins 315 are arranged in a circumferential array at equal intervals on both ends of the drive roller 312, and several limiting holes 316 matching the limiting pins 315 are equally spaced on both sides of the belt 311. In this example, the diameter of the limiting hole 316 is larger than the diameter of the limiting pin 315, so that the limiting pin 315 can smoothly pass into or out of the corresponding limiting hole 316. This matching and limiting of the limiting pin 315 and the limiting hole 316 prevents slippage between the belt 311 and the drive roller 312, thus affecting the stepping accuracy.

[0035] In addition, see Figure 1 The pastry feeding and conveying unit 2 of the food decal production line is used to feed the pastries to be decorated to the pressing unit 3. Specifically, in this example, the conveying direction of the pastry feeding and conveying unit 2 is arranged perpendicular to the conveying direction of the pastry conveyor belt 31 of the pressing unit 3, so that each pastry to be decorated is conveyed step by step to the bottom of the corresponding punching hole. After the punching knife 322 punches and forms the decorative surface, the decorative surface moves further downward with the punching knife 322 to attach the decorative surface to each pastry to be decorated.

[0036] To ensure accurate attachment of the decorative fabric to each decorative dot, the positions of each dot at the dot feeding and conveying unit 2 need to be precisely defined. Specifically, in this embodiment, the dot feeding and conveying unit 2 includes a dot conveyor belt 21 and a spray mechanism 22 mounted upstream of the conveyor belt 21. The spray mechanism sprays water onto the surface of the dot to aid in attachment. See also... Figure 1 In this example, the spray mechanism 22 includes a number of spray components that are mounted on the surface conveyor belt 21 via a spray mechanism frame and are arranged at equal intervals along the conveying direction perpendicular to the surface conveyor belt 21. The spray components include a sprayer 221 for connecting to an external water source and for converting water into small-diameter water droplets, so that water mist is sprayed out from the nozzle 222. In this example, the spray nozzle 222 is set perpendicular to the surface conveyor belt 21, and a water spray valve 223 is also connected between the nozzle 222 and the sprayer 221 to control the start and stop of the spray.

[0037] Furthermore, before the decorative dots enter the pressing unit 3 along with the dot conveyor belt 21, the dots on the dot conveyor belt 21 need to be arranged so that their distribution matches the array of punch holes 314 on the belt 311. This ensures that the decorative fabric can be accurately attached to the dot surface. Specifically, to adjust the position of each dot, see [link to documentation]. Figure 4 Above the pastry conveyor belt 21, there are also column spacing adjustment mechanisms 23 for adjusting the column spacing between pastries parallel to the pastry conveying direction, and row spacing adjustment mechanisms 24 for adjusting the row spacing between pastries perpendicular to the pastry conveying direction.

[0038] For details, see Figure 4 In this embodiment, the column spacing adjustment mechanism includes a column spacing adjustment frame mounted above the pastry conveyor belt. The frame is fixedly equipped with several adjustment clamps 25 at equal intervals, and the number of adjustment clamps 25 is the same as the number of columns of pastry on the conveyor belt. Each adjustment clamp 25 includes two clamping plates 251 arranged parallel to the pastry conveying direction and a clamping cylinder 252 for controlling the distance between the two clamping plates 251. Thus, as the pastry conveyor belt advances, the clamping of the clamping plates 251 causes the pastry to be decorated, which is deviated from the design axis of the corresponding column, to be accurately moved to coincide with the design axis of that column, thereby achieving column position adjustment. Additionally, the row spacing adjustment mechanism includes a row spacing adjustment frame mounted above the pastry conveyor belt, and an actuating plate 241 arranged perpendicular to the pastry conveyor belt 21 and used for movement in a direction perpendicular to the pastry conveyor belt. At the bottom of the actuating plate 241, a plurality of pastry baffles 242, collinear with and corresponding one-to-one with the central axes of each adjusting fixture 25, are fixedly installed at equal intervals. The number of pastry baffles 242 is consistent with the number of rows of pastries on the pastry conveyor belt. Thus, as the pastry conveyor belt advances, the spacing between the rows of pastries is adjusted by the obstruction of the pastries by the baffles 242 when the actuating plate 241 falls, matching the distribution of the stamping holes. For details on driving the up-and-down reciprocating motion of the actuating plate 241, see [link to details]. Figure 5In this embodiment, the row spacing adjustment mechanism 24 further includes a drive motor 243 fixed to the top of the row spacing adjustment frame. Two guide posts 244 are symmetrically arranged on both sides of the row spacing adjustment frame, perpendicular to the doll conveyor belt. Two sliders 245, respectively slidably nested outside the two guide posts 244, are fixedly connected to one side of the action plate 241. A cam-link assembly 246 is also provided between the action plate 241 and the output shaft of the drive motor 243 for power transmission. The cam-link assembly is a conventional component in the art and will not be described in detail here. Thus, driven by the drive motor 243 and limited by the cooperation of the guide posts 244 and the sliders 245, the action plate 241 can reciprocate vertically, thereby adjusting the row spacing of the dolls on the doll conveyor belt. Furthermore, considering the risk of slippage between the conveyor belt and its drive roller, which could cause a deviation between the actual stepping distance of the conveyor belt and the designed distance, resulting in inaccurate alignment during subsequent decorative surface application, this embodiment employs a plurality of positioning pins arranged at equal intervals on both ends of the drive roller of the conveyor belt. Additionally, a plurality of positioning holes matching each positioning pin are equally spaced on both sides of the conveyor belt. The positioning pins, inserted into the corresponding positioning holes, are used to position the conveyor belt, preventing slippage and ensuring the accuracy of the pastry's position.

[0039] In addition, to determine the timing of the pressing down of the actuating plate 241, in this embodiment, a position sensor 26 is installed downstream of the row spacing adjustment mechanism 24. The position sensor 26 detects the adjusted dough rows, and the actuating plate 241 is pressed down based on whether the position sensor detects dough. Furthermore, to ensure that the dough conveying of the dough conveyor belt and the dough conveyor belt are synchronized, so that the pressing unit 3 can perform accurate stamping and attaching operations, the food decal production line in this example is also equipped with a control unit for controlling the synchronous stepping of the dough conveyor belt and the dough conveyor belt.

[0040] Although some preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0041] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A decal production line for food products, characterized in that, The system includes a dough pressing unit, a dough feeding and conveying unit with a conveying direction perpendicular to the dough pressing unit, and an appliqué unit mounted above the tail of the dough feeding and conveying unit for pressing and cutting the dough output from the dough pressing unit and then feeding the dough to the dough feeding and conveying unit for appliqué. The dough feeding and conveying unit includes a dough conveyor belt, a spraying mechanism mounted sequentially above the dough conveyor belt from upstream to downstream, a column spacing adjustment mechanism for adjusting the spacing between rows of dough parallel to the dough feeding direction, and a mechanism for adjusting the spacing perpendicular to the dough feeding direction. The feeding direction includes a row spacing adjustment mechanism for the row spacing between each dot; the pressing unit includes a dough conveyor belt arranged perpendicular to the dough feeding unit, and a pressing head mounted on the dough conveyor belt at a position above the dough feeding unit; the dough conveyor belt includes a drive roller, a belt with overlapping upper and lower punch holes, and a stepper motor for driving the belt to step forward; the two ends of the drive roller are circumferentially arrayed with several limit pins at equal intervals, and the two sides of the belt are circumferentially arrayed with several limit holes that match the limit pins at equal intervals.

2. The decal production line for foodstuffs according to claim 1, characterized in that, The dough sheet pressing unit includes a dough feeding module and several stages of dough sheet pressing modules arranged downstream of the dough feeding module for gradually thinning the dough sheet.

3. The decal production line for foodstuffs according to claim 2, characterized in that, The dough feeding module includes a feeding hopper, a feeding roller with two adjustable toothed rollers located below the feeding hopper, an extrusion roller located below the gap between the feeding rollers and with a pre-extrusion gap between it and the corresponding toothed roller, and a primary conveyor belt for receiving the dough and conveying it to the downstream dough pressing module; each dough pressing module includes a pressing roller with two adjustable pressing rollers and a secondary conveyor belt located below the pressing rollers; the gap between the pressing rollers of each dough pressing module decreases sequentially from upstream to downstream.

4. The decal production line for foodstuffs according to claim 1, characterized in that, The spraying mechanism includes several spraying components arranged at equal intervals. Each spraying component includes a sprayer that is connected to an external water source and a nozzle that is connected to the sprayer via a water spray valve and whose nozzle faces the surface conveyor belt.

5. The decal production line for foodstuffs according to claim 1 or 4, characterized in that, The column spacing adjustment mechanism includes several adjusting clamps arranged at equal intervals; each adjusting clamp includes two clamping plates arranged parallel to the pastry conveying direction and a clamping cylinder arranged perpendicular to the pastry conveyor belt for adjusting the distance between the two clamping plates; the row spacing adjustment mechanism includes an action plate arranged perpendicular to the pastry conveyor belt for moving along the direction perpendicular to the pastry conveyor belt and pastry baffles fixed at equal intervals to the bottom of the action plate and arranged in a one-to-one correspondence with the central axis of the adjusting clamp.

6. The decal production line for foodstuffs according to claim 5, characterized in that, The row spacing adjustment mechanism also includes a drive motor mounted on the pastry conveyor belt via a row spacing adjustment frame, guide columns perpendicular to the pastry conveyor belt and symmetrically arranged on both sides of the row spacing adjustment frame, two sliders fixedly connected to the action plate and respectively slidably nested outside the two guide columns, and a cam linkage assembly for transmitting the power of the drive motor to the action plate.

7. The decal production line for foodstuffs according to claim 1, characterized in that, The pressing head includes a fixed pressing blade and a moving pressing blade; the arrangement of the dots at the dot conveyor belt matches the blade holes at the fixed pressing blade, the blade head of the moving pressing blade, and the array of the pressing holes.

8. The food decal production line according to claim 7, characterized in that, The stamping cutter is located below the bearing section of the belt that carries the bearing surface and is in contact with the bearing section.

9. The food decal production line according to claim 1, characterized in that, It also includes a control unit for controlling the synchronous stepping of the pasta conveyor belt and the pasta belt conveyor belt.

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