A multi-layer co-extrusion casting device for gummy candies

Abstract

The present application relates to the technical field of co-extrusion casting, in particular to a soft candy multi-layer co-extrusion casting device, which comprises a conveying table, a plurality of molds placed on the conveying table, a bearing support fixed on the conveying table, and a top plate fixed on the top of the bearing support; a hopper fixed on the bearing support, a co-extrusion mechanism arranged in the hopper, a casting head connected to the co-extrusion mechanism, and the co-extrusion mechanism capable of conveying material to the mold through the casting head; and a pneumatic adsorption mechanism arranged on the co-extrusion mechanism and connected to the casting head, which is driven to move when the co-extrusion mechanism controls the material to be conveyed to the mold through the casting head, and forms a slight positive pressure in the casting head to ensure the smooth conveying of the material to the mold, and is driven to move when the co-extrusion mechanism resets after the casting is completed, and forms a strong negative pressure in the casting head to avoid the dripping of the material remaining in the casting head.

Description

Technical Field

[0001] This invention relates to the field of co-extrusion casting technology, specifically a multi-layer co-extrusion casting device for gummy candies. Background Technology

[0002] In the production of gummy candies, multi-layer co-extrusion casting technology is a key process for achieving orderly layering of syrups of different colors, flavors, or textures in the same mold. This technology feeds different syrups into concentric feeding channels, allowing each layer of syrup to converge in the casting head and be extruded synchronously in a laminar flow state, and injected into the mold cavity in one go, thereby realizing the continuous production of multi-layer gummy candies.

[0003] Because of its high viscosity and poor fluidity, a certain amount of residual syrup usually adheres to the inner wall of the pouring head and the outlet after each pour. If the residual syrup is not effectively controlled, it will gradually drip from the pouring head under gravity, contaminating the conveyor belt and the mold surface, making production cleaning difficult. At the same time, the dripping syrup will change the syrup flow rate of the next pour, resulting in uneven thickness of each layer in the mold, affecting the consistency of the product appearance and the pass rate.

[0004] To address the aforementioned dripping issue, some existing technologies incorporate mechanical valve plates or sealing blocks at the outlet of the casting head to prevent syrup dripping by sealing the outlet after casting. However, for multi-layer co-extrusion casting heads, which have multiple concentric and isolated flow channels, simple sealing at the outlet is insufficient to completely eliminate the continuous dripping tendency of residual syrup in the internal flow channels. To address this, negative pressure holes can be opened on the side wall of the casting head and connected to an external vacuum pump. After casting, residual syrup inside the casting head can be actively removed by negative pressure suction. However, since the negative pressure holes are open, the casting head is filled with high-pressure flowing syrup during casting. The continuous opening of the negative pressure holes causes some syrup to be squeezed into them under pressure. This syrup accumulates in the negative pressure holes, clogging the negative pressure channels and weakening the subsequent adsorption effect. Furthermore, some syrup that should have been injected into the mold is lost due to diversion by the negative pressure holes, resulting in insufficient mold filling and affecting product molding quality. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-layer co-extrusion casting device for gummy candies to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-layer co-extrusion casting device for gummy candies, comprising: a conveyor platform and multiple molds placed on the conveyor platform, a support bracket fixed on the conveyor platform, and a top plate fixed on the top of the support bracket; further comprising: a hopper fixed on the support bracket, a co-extrusion mechanism disposed inside the hopper, a casting head connected to the co-extrusion mechanism, the co-extrusion mechanism being able to convey material through the casting head to the mold; and a pressure adsorption mechanism disposed on the co-extrusion mechanism and connected to the casting head, the pressure adsorption mechanism being able to operate when the co-extrusion mechanism moves, and alternately forming positive and negative pressures inside the casting head.

[0007] As a further aspect of the present invention: the co-extrusion mechanism includes a plurality of outer sleeves fixed in the hopper and distributed at equal intervals, the ends of the outer sleeves being fixedly connected to the casting head, an outer feed port being formed on the outer circumferential wall of the outer sleeves, and an air thrust ring being slidably and sealingly connected inside the outer sleeves; it also includes a feeding assembly and a pushing assembly disposed in the outer sleeves and connected to the top plate.

[0008] As a further embodiment of the present invention: the feeding assembly includes an inner sleeve fixed inside the outer sleeve, the inner sleeve being slidably and sealingly connected to the air-push ring and communicating with the pouring head, and an inner feed port being formed on the outer circumferential wall of the inner sleeve.

[0009] As a further embodiment of the present invention: the pushing assembly includes a cylinder fixed on the top plate, a movable plate fixed to the telescopic end of the cylinder, a plurality of plunger rods evenly distributed on the movable plate, and a piston disc slidably and sealingly connected to the inner sleeve at the end of the plunger rod.

[0010] As a further embodiment of the present invention: the gas pressure adsorption mechanism includes a negative pressure tube fixed to the end of the inner sleeve, the plunger rod passing through the negative pressure tube, a follower ring slidably connected inside the negative pressure tube, and an exhaust hole and a sealing groove formed on the follower ring; it also includes a driven component and a pumping component disposed inside the negative pressure tube and connected to the plunger rod.

[0011] As a further embodiment of the present invention: the driven component includes a sealing ring fixed on the plunger rod, the sealing ring fitting into the sealing groove, a support column fixed on the sealing ring penetrating the follower ring, and a limiting ring fixed at the end of the support column that abuts against the follower ring.

[0012] As a further embodiment of the present invention: the air pumping assembly includes a plurality of negative pressure holes formed on the outer circumference of the pouring head and distributed equidistantly in a circular pattern, a storage box connected to the negative pressure holes is fixed on the pouring head, and a conduit connected to the storage box is connected to the outer circumference of the negative pressure pipe.

[0013] As a further embodiment of the present invention: an exhaust channel is constructed between the sealing ring and the sealing groove, and the exhaust channel is connected to the exhaust hole.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention achieves automatic alternation between micro-positive pressure flow assistance during casting and strong negative pressure adsorption after casting through the coordinated cooperation of the co-extrusion mechanism and the air pressure adsorption mechanism. During the casting stage, the plunger rod pushes the follower ring to compress the lower chamber. Part of the air is discharged through the exhaust channel and exhaust hole, and another part of the air enters the storage box through the conduit and is discharged into the interior of the casting head through the negative pressure hole, thereby forming a micro-positive pressure in the casting head. On the one hand, the micro-positive pressure forms an air pressure barrier inside the casting head that is slightly higher than the external environment, so that the negative pressure hole is in a positive pressure environment, thereby effectively preventing high viscosity syrup from flowing into the negative pressure hole under the action of casting pressure, avoiding blockage of the negative pressure channel and loss of casting weight; on the other hand, the pressure value of the micro-positive pressure is small, which can assist the high viscosity syrup to flow smoothly towards the discharge port, and will not cause the syrup to splash from the discharge port or destroy the stable laminar flow structure formed by the multi-layer syrup in the casting head due to excessive positive pressure impact, thereby ensuring the clarity and thickness uniformity of the interfaces of each layer of multi-layer soft candy.

[0015] During the plunger rod reset phase, after the sealing ring and sealing groove seal the exhaust channel, the moving ring continues to move, increasing the volume of the lower chamber and creating a strong negative pressure. Since the exhaust channel is blocked, the negative pressure is completely transmitted to the storage box and negative pressure hole through the conduit, generating an adsorption force inside the pouring head sufficient to overcome the gravity and adhesion of the syrup. The residual syrup blocked on the negative pressure hole is sucked into the storage box under the action of negative pressure, and under the action of viscous pull, it carries the nearby syrup into the storage box as well, thereby actively removing the residual syrup from the inner wall of the pouring head and the outlet, avoiding the problem of syrup dripping due to gravity between two pours. Attached Figure Description

[0016] Figure 1 A schematic diagram of one embodiment of a multi-layer co-extrusion casting device for gummy candies; Figure 2 This is a schematic diagram showing the connection relationship between the co-extrusion mechanism and the negative pressure adsorption mechanism in one embodiment of a multi-layer co-extrusion casting device for gummy candies. Figure 3 A front view schematic diagram of one embodiment of a multi-layer co-extrusion casting device for gummy candies; Figure 4 A schematic diagram of the suction state of the negative pressure pipe in one embodiment of a multi-layer co-extrusion casting device for gummy candies; Figure 5 A schematic diagram of the exhaust state of the negative pressure pipe in one embodiment of a multi-layer co-extrusion casting device for gummy candies; Figure 6 This is a schematic diagram of the exploded structure of a portion of the negative pressure adsorption mechanism in one embodiment of a multi-layer co-extrusion casting device for gummy candies. Figure 7 A cross-sectional structural schematic diagram of one embodiment of a multi-layer co-extrusion casting device for gummy candies; Figure 8 A schematic diagram of the air supply state of the conduit in one embodiment of a multi-layer co-extrusion casting device for gummy candies; Figure 9 This is a schematic diagram of the air intake state of the conduit in one embodiment of a multi-layer co-extrusion casting device for gummy candies.

[0017] In the diagram: 1. Conveyor table; 2. Mold; 3. Support bracket; 4. Hopper; 5. Top plate; 6. Outer sleeve; 601. Outer feed port; 7. Inner sleeve; 701. Inner feed port; 8. Negative pressure pipe; 9. Casting head; 901. Negative pressure hole; 10. Storage box; 11. Air thrust ring; 12. Cylinder; 13. Movable plate; 14. Plunger rod; 15. Piston disc; 16. Follower ring; 1601. Exhaust port; 1602. Sealing groove; 17. Sealing ring; 18. Support column; 19. Limiting ring; 20. Guide tube. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Furthermore, elements in this invention are referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0020] Please see Figures 1-9 In this embodiment of the invention, a multi-layer co-extrusion casting device for gummy candies includes: a conveyor platform 1 and multiple molds 2 placed on the conveyor platform 1, a support bracket 3 fixed on the conveyor platform 1, and a top plate 5 fixed on the top of the support bracket 3; it also includes: a hopper 4 fixed on the support bracket 3, a co-extrusion mechanism disposed inside the hopper 4, a casting head 9 connected to the co-extrusion mechanism, the co-extrusion mechanism being able to convey material through the casting head 9 to the molds 2; and a pressure adsorption mechanism disposed on the co-extrusion mechanism and connected to the casting head 9, the pressure adsorption mechanism being able to operate when the co-extrusion mechanism moves, and alternately forming positive and negative pressures inside the casting head 9.

[0021] Specifically, during the multi-layer co-extrusion casting of the gummies, some syrup remains in the casting head 9 after casting is completed. To prevent this syrup from dripping due to gravity, it is necessary to adsorb the residual syrup. To this end, when the co-extrusion mechanism is working, the syrup can be transported to the mold 2 through the casting head 9. At the same time, the co-extrusion mechanism drives the air pressure adsorption mechanism to move and form a slight positive pressure in the casting head 9, thereby ensuring that the syrup in the casting head 9 is discharged smoothly and does not flow into the air pressure adsorption mechanism. After co-extrusion is completed, the co-extrusion mechanism resets and drives the air pressure adsorption mechanism to move accordingly. The air pressure adsorption mechanism will form a strong negative pressure in the casting head 9 to adsorb the syrup remaining in the casting head 9, thereby preventing the syrup from dripping. Repeat the above steps to ensure the continuous casting production of gummies.

[0022] Please see Figures 1-3 The co-extrusion mechanism includes multiple outer sleeves 6 fixed inside the hopper 4 and evenly distributed, with the ends of the outer sleeves 6 fixedly connected to the casting head 9. An outer feed port 601 is formed on the outer circumferential outer wall of the outer sleeve 6, and a pneumatic thrust ring 11 is slidably and sealed inside the outer sleeve 6. It also includes a feeding assembly and a pushing assembly disposed inside the outer sleeve 6 and connected to the top plate 5. The feeding assembly includes an inner sleeve 7 fixed inside the outer sleeve 6, which is slidably and sealed to the pneumatic thrust ring 11 and communicates with the casting head 9. An inner feed port 701 is formed on the outer circumferential outer wall of the inner sleeve 7. The pushing assembly includes a cylinder 12 fixed on the top plate 5. A movable plate 13 is fixed to the telescopic end of the cylinder 12. Multiple plunger rods 14 evenly distributed are fixed on the movable plate 13, and a piston disc 15 is fixed to the end of the plunger rod 14 and slidably and sealed to the inner sleeve 7.

[0023] In detail, to achieve multi-layer co-extrusion casting of gummies, existing technologies typically employ a method of interlocking multiple sleeves, adjusting the spacing between the sleeves according to the required thickness of each gummy layer, so that the gap between the sleeves is the same as the required layer thickness of the gummies; please refer to Figure 3In the case of double-layer co-extrusion casting, the inner sleeve 7 is hollow, and the outer sleeve 6 is fitted over the inner sleeve 7. Together, they form a double-layer feeding channel. One-way valves are installed at the ends of the outer sleeve 6 and the inner sleeve 7 near the casting head 9. The hopper 4 is filled with the syrup required for feeding through the outer sleeve 6. A one-way valve is installed on the outer inlet 601, which is located below the inner sleeve 7 and at the bottom of the hopper 4. Under the action of the one-way valve, the syrup can only enter the outer sleeve 6 through the outer inlet 601 and is then transported to the casting head 9 through the outer sleeve 6. The air-push ring 11 is located above the outer inlet 601 and divides the outer sleeve 6 into two chambers: the outer air-push chamber and the outer feeding chamber. The outer air-push chamber is connected to an air supply pipe, which is connected to an external air source. The external air source can supply and draw air into the outer air-push chamber through the air supply pipe. This causes a corresponding change in the air pressure within the external air-push chamber, thereby controlling the corresponding action of the air-push ring 11 to adsorb and discharge the syrup in the hopper 4. The inner inlet 701 is located above the outer sleeve 6 and is also equipped with a one-way valve. The inner inlet 701 is connected to a feeding pipe, which is connected to a storage tank filled with the syrup required for feeding from the inner sleeve 7. Under the action of the one-way valve, the syrup can only enter the inner sleeve 7 through the inner inlet 701 and is then transported to the pouring head 9 through the inner sleeve 7. The piston disc 15 is located above the inner inlet 701 and divides the inner sleeve 7 into two chambers: an inner air-push chamber and an inner feeding chamber. When the plunger rod 14 moves axially along the inner sleeve 7, it drives the piston disc 15 to slide within the inner sleeve 7, thereby changing the air pressure in the inner feeding chamber to perform the corresponding adsorption and feeding actions. Please refer to [link to relevant documentation]. Figure 3The support bracket 3 has a guide rail fixed to its side wall, and a guide block is slidably installed on the guide rail. The guide block is fixedly connected to the movable plate 13. With the cooperation of the guide rail and the guide block, the stability of the movable plate 13 is ensured. In the initial state, under the action of the cylinder 12, the movable plate 13 is located at the end of its stroke near the top plate 5. Thus, the piston rod 14 controls the piston disc 15 to be located at the end of its stroke away from the pouring head 9. At the same time, under the action of the external air source, the air thrust ring 11 is located at the end of its stroke away from the pouring head 9. At this time, the outer feeding chamber is filled with the required syrup for the outer layer, and the inner feeding chamber is filled with syrup. The inner chamber is filled with the required syrup for the inner layer. When the candy needs to be poured, cylinder 12 drives movable plate 13 to move towards pouring head 9, controlling plunger rod 14 to simultaneously drive piston disc 15 to slide towards pouring head 9 within inner sleeve 7, thereby pressurizing and pushing the inner layer syrup in the inner feeding chamber into pouring head 9. At the same time, external air source injects gas into the outer air push chamber, pushing air push ring 11 to slide towards pouring head 9 within outer sleeve 6, pressurizing and pushing the outer layer syrup in the outer feeding chamber into pouring head 9. The two syrups form a double layer of syrup of corresponding thickness within pouring head 9, ultimately... The material is co-extruded into the mold 2 below, completing the pouring and discharge of the multi-layered soft candy. When the cylinder 12 moves the movable plate 13 to the end of its stroke near the pouring head 9, one discharge is completed. At this time, the cylinder 12 begins to drive the movable plate 13 to reverse and reset, and the plunger rod 14 simultaneously drives the piston disc 15 to move away from the pouring head 9. At the same time, the external air source draws air into the outer air thrust chamber, driving the air thrust ring 11 to reset away from the pouring head 9. During the reset process of the piston disc 15, the volume of the inner feeding chamber increases, forming a negative pressure, and the inner layer syrup required for the next pouring is fed through the inner inlet 701. The material is drawn into the inner feeding chamber through the feeding pipe; similarly, during the resetting process of the air push ring 11, the volume of the outer feeding chamber increases to form a negative pressure, which draws the outer layer syrup required for the next pouring into the outer feeding chamber through the outer inlet 601, waiting for the next pouring action; wherein, a chain conveyor is integrated in the conveyor table 1, which works with the mold 2 to guide the mold 2 to move radially along the conveyor table 1. After the current pouring is completed, the chain conveyor controls the mold 2 to translate a certain distance, so that the adjacent cavity of the mold 2 moves to the position that matches the pouring head 9, thereby realizing the continuous co-extrusion pouring of the soft candy.

[0024] Please see Figures 4-9The gas pressure adsorption mechanism includes a negative pressure tube 8 fixed to the end of the inner sleeve 7, a plunger rod 14 passing through the negative pressure tube 8, and a follower ring 16 slidably connected inside the negative pressure tube 8. The follower ring 16 has an exhaust port 1601 and a sealing groove 1602. It also includes a driven component and a pumping component disposed inside the negative pressure tube 8 and connected to the plunger rod 14. The driven component includes a sealing ring 17 fixed to the plunger rod 14, the sealing ring 17 fitting into the sealing groove 1602, and a through-hole fixed to the sealing ring 17. The follower ring 16 has a support column 18, and the end of the support column 18 is fixed with a limiting ring 19 that abuts against the follower ring 16. The pumping assembly includes a plurality of negative pressure holes 901 formed on the outer circumference of the pouring head 9 and distributed equidistantly in a circular pattern. A storage box 10 connected to the negative pressure holes 901 is fixed on the pouring head 9. A conduit 20 connected to the storage box 10 is connected to the outer circumference of the negative pressure pipe 8. An exhaust channel is formed between the sealing ring 17 and the sealing groove 1602. The exhaust channel is connected to the exhaust hole 1601.

[0025] Furthermore, the negative pressure hole 901 is angled downwards. This downward angled design helps to prevent syrup from flowing into the negative pressure hole 901 as it exits the pouring head 9; please refer to [link to relevant documentation]. Figure 6 The sealing ring 17 is conical, and the sealing groove 1602 is also conical. The two work together to control the conduction state of the exhaust channel. The outer side of the follower ring 16 is sealed against the inner wall of the negative pressure pipe 8. Under the action of friction, the follower ring 16 remains in its position within the negative pressure pipe 8 when no external force is applied. The follower ring 16 and the sealing ring 17 work together to divide the negative pressure pipe 8 into two chambers: an upper chamber and a lower chamber. An air hole is formed at the top of the negative pressure pipe 8, connecting to the upper chamber, ensuring that the upper chamber always maintains the same air pressure as the external environment. Please refer to [link to relevant documentation]. Figure 4 In the initial state, under the action of cylinder 12, the movable plate 13 is positioned at the end of its stroke near the top plate 5. The movable plate 13, through the plunger rod 14, controls the sealing ring 17 to fit tightly against the sealing groove 1602, and guides the follower ring 16 to the end of its stroke away from the pouring head 9. In this state, the limiting ring 19 and the follower ring 16 are separated, the exhaust passage is blocked, and the upper and lower chambers are separated, with the upper chamber having the smallest volume and the lower chamber having the largest volume. Please refer to [link to relevant documentation]. Figure 5When pouring is required, cylinder 12 drives movable plate 13 to move plunger rod 14 toward pouring head 9. Under the action of piston disc 15, the syrup in inner sleeve 7 is controlled to enter pouring head 9. At the same time, under the action of external air source, air thrust ring 11 moves synchronously and controls the syrup in outer sleeve 6 to enter pouring head 9. Plunger rod 14 also drives sealing ring 17 to move synchronously. Since follower ring 16 is fixed in position under friction in the initial state, sealing ring 17 will gradually disengage from sealing groove 1602, and exhaust channel will be opened, connecting upper chamber and lower chamber; please refer to Figure 8 The plunger rod 14 continues to move, and under the action of the support column 18, the limiting ring 19 moves rapidly to the position of contacting the follower ring 16. Then, the plunger rod 14 pushes the follower ring 16 together towards the pouring head 9 through the limiting ring 19. At this time, the volume of the lower chamber is compressed and reduced. Part of the air in the lower chamber will enter the upper chamber through the exhaust channel and exhaust hole 1601 and be discharged through the air hole. The other part of the air will be forced into the storage box 10 through the conduit 20. Then, the storage box 10 will discharge the air into the pouring head 9 through the negative pressure hole 901 (see [reference]). Figure 5 Since the exhaust channel discharges some gas, a slight positive pressure will be formed inside the pouring head 9. This can prevent the syrup from splashing or damaging the syrup layering due to excessive positive pressure impact, and help push the syrup smoothly from the pouring head 9 into the mold 2. It can also prevent the syrup from flowing into the negative pressure hole 901 and causing the mold 2 to be incompletely filled.

[0026] After one pouring and discharge cycle, cylinder 12 drives movable plate 13 to reverse and reset. Plunger rod 14 drives sealing ring 17 to move away from pouring head 9. Initially, follower ring 16 remains fixed in position. Sealing ring 17 controls the movement of support column 18, causing limit ring 19 to separate from follower ring 16. Simultaneously, sealing ring 17 gradually approaches and re-embeds into sealing groove 1602. Once sealing ring 17 is in contact with sealing groove 1602, it will again block the exhaust passage, and the upper and lower chambers will be separated again (see [reference]). Figure 4 Please see; Figure 9Subsequently, the plunger rod 14 continues to move, driving the follower ring 16 away from the pouring head 9 via the sealing ring 17. The volume of the lower chamber gradually increases and forms a negative pressure. In this state, since only the conduit 20 is in a conductive state and the exhaust channel does not share the airflow, the conduit 20 will form a strong negative pressure in the storage box 10. Under the action of negative pressure, the air in the pouring head 9 will be drawn into the storage box 10 through the negative pressure hole 901, and then enter the lower chamber of the negative pressure pipe 8 through the conduit 20. Due to the high viscosity of the syrup, the residual syrup blocking the negative pressure hole 901 will be adsorbed, and under the action of viscosity, it will pull on the remaining syrup nearby, thereby guiding the syrup through the negative pressure hole 901. 1. The syrup enters the storage box 10 to prevent it from dripping due to gravity, effectively reducing material waste and mold contamination during production. 2. After the conveyor 1 moves the next mold 2 to below the pouring head 9, the above actions are repeated to perform the next multi-layer co-extrusion pouring operation for the soft candy, thus achieving continuous and stable soft candy production. The storage box 10 is detachable, with a transparent outer shell and measuring scales. Workers can visually observe the amount of residual syrup absorbed through the storage box 10. When the cumulative absorption reaches a preset value, the storage box 10 can be disassembled and cleaned, and the collected syrup can be returned to the production process for recycling, further reducing material loss.

[0027] Working principle: In the initial state, cylinder 12 contracts, and plunger rod 14 drives sealing ring 17 to fit with sealing groove 1602 of follower ring 16, blocking the exhaust channel. Follower ring 16 is located above negative pressure pipe 8, and the lower chamber has the largest volume. During pouring, plunger rod 14 moves downward, and under the action of external air source, the syrup in the inner and outer feeding chambers is transported to pouring head 9 and poured into mold 2. Sealing ring 17 disengages from sealing groove 1602, and exhaust channel is opened. At the same time, limit ring 19 pushes follower ring 16 downward to compress lower chamber. Part of the air in lower chamber is discharged to upper chamber and escapes through exhaust channel and exhaust hole 1601, and the other part enters the interior of pouring head 9 through conduit 20, storage box 10 and negative pressure hole 901 to form micro Positive pressure assists in the smooth extrusion of high-viscosity syrup while preventing syrup from flowing back into the negative pressure hole 901. After pouring, the plunger rod 14 moves upward and resets, and the sealing ring 17 is the first to re-embed into the sealing groove 1602, completely blocking the exhaust channel. Then, the sealing ring 17 drives the follower ring 16 to continue moving upward, increasing the volume of the lower chamber and forming a strong negative pressure. Since the exhaust channel has been cut off, all of this negative pressure is transmitted to the storage box 10 and the negative pressure hole 901 through the conduit 20, generating an adsorption force on the inside of the pouring head 9, sucking the residual syrup into the storage box 10, effectively preventing dripping. During the process of the plunger rod 14 continuing to reset, the automatic replenishment of the inner and outer layers of syrup is completed. The conveyor table 1 moves out of the poured mold 2 and sends it into the next empty mold 2, repeating the above cycle to achieve continuous pouring.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-layer co-extrusion casting apparatus for gummy candies, comprising: The system comprises: a conveyor platform and multiple molds placed on the conveyor platform; a support frame fixed on the conveyor platform; and a top plate fixed on the top of the support frame; characterized in that it further comprises: a hopper fixed on the support frame; a co-extrusion mechanism disposed inside the hopper; a casting head connected to the co-extrusion mechanism; the co-extrusion mechanism being able to convey material through the casting head to the mold; and a pneumatic adsorption mechanism disposed on the co-extrusion mechanism and connected to the casting head; the pneumatic adsorption mechanism being able to operate when the co-extrusion mechanism moves, and alternately forming positive and negative pressures inside the casting head.

2. The multi-layer co-extrusion casting device for gummy candies according to claim 1, characterized in that, The co-extrusion mechanism includes multiple outer sleeves fixed inside the hopper and evenly distributed, with the ends of the outer sleeves fixedly connected to the casting head, an outer feed port formed on the outer circumferential wall of the outer sleeve, and an air-push ring slidably and sealed inside the outer sleeve; it also includes a feeding assembly and a pushing assembly disposed inside the outer sleeve and connected to the top plate.

3. The multi-layer co-extrusion casting device for gummy candies according to claim 2, characterized in that, The feeding assembly includes an inner sleeve fixed inside the outer sleeve. The inner sleeve is slidably and sealed to the air-push ring and connected to the pouring head. An inner feed port is formed on the outer circumferential wall of the inner sleeve.

4. The multi-layer co-extrusion casting device for gummy candies according to claim 3, characterized in that, The pushing assembly includes a cylinder fixed to the top plate, a movable plate fixed to the telescopic end of the cylinder, a plurality of plunger rods evenly distributed on the movable plate, and a piston disc that is slidably and sealingly connected to the inner sleeve at the end of the plunger rod.

5. The multi-layer co-extrusion casting device for gummy candies according to claim 4, characterized in that, The gas pressure adsorption mechanism includes a negative pressure tube fixed to the end of the inner sleeve, a plunger rod passing through the negative pressure tube, a follower ring slidably connected inside the negative pressure tube, and an exhaust hole and a sealing groove formed on the follower ring; it also includes a driven component and a pumping component disposed inside the negative pressure tube and connected to the plunger rod.

6. The multi-layer co-extrusion casting device for gummy candies according to claim 5, characterized in that, The driven component includes a sealing ring fixed on the plunger rod, the sealing ring fitting into the sealing groove, a support column fixed on the sealing ring penetrating the follower ring, and a limiting ring fixed at the end of the support column that abuts against the follower ring.

7. The multi-layer co-extrusion casting device for gummy candies according to claim 5, characterized in that, The pump assembly includes a plurality of negative pressure holes formed on the outer circumference of the pouring head and distributed equidistantly around the circumference. A storage box connected to the negative pressure holes is fixed on the pouring head, and a conduit connected to the storage box is connected to the outer circumference of the negative pressure pipe.

8. The multi-layer co-extrusion casting device for gummy candies according to claim 6, characterized in that, An exhaust channel is formed between the sealing ring and the sealing groove, and the exhaust channel is connected to the exhaust hole.

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