Freeze-drying food processing air blowing demolding structure

Abstract

The application relates to the technical field of food processing equipment, in particular to a blowing demolding structure for freeze-dried food processing, which comprises a mold base, a gas distribution base, a mold shell, an ejection driving assembly, a guide support assembly and a control system. The gas distribution base is provided with an airflow channel and realizes partitioned gas supply through an electromagnetic valve, the bottom of the mold shell is provided with blowing holes to form uniform air films and reduce the adhesion between freeze-dried food and the mold; the ejection driving assembly realizes flexible ejection under the action of elastic buffering; the guide support assembly is used for limiting the movement of the mold shell and ensuring coaxial guidance; a vibration motor is used for assisting in reducing static friction; and the control system is used for coordinating the timing cooperation of the partitioned gas supply of the electromagnetic valve, vibration and ejection action. The application can realize uniform desorption and low-damage demolding of freeze-dried food, and improve the demolding efficiency and the integrity of finished products.

Description

Technical Field

[0001] This application relates to the field of food processing equipment technology, and in particular to an air-blowing demolding structure for freeze-dried grain processing. Background Technology

[0002] Freeze-dried food is a type of food prepared through a vacuum freeze-drying process. It has a porous and loose internal structure, making it prone to moisture absorption, breakage, and low structural strength. During the production of freeze-dried food, molds are typically used to shape and fix the material before demolding and removal.

[0003] Existing methods for demolding freeze-dried grains mainly include mechanical ejection and gas blowing demolding, with gas blowing demolding being more widely used due to its lower damage to the product. Current gas blowing demolding devices typically use a single air chamber or a simple partitioned air path structure at the bottom of the mold to allow compressed air to enter between the mold and the material, forming an air film that reduces friction and achieves demolding.

[0004] However, existing technologies still have the following problems: First, uneven gas distribution leads to incomplete demolding in some areas, which can easily result in residual adhesion; second, the gas film stability is poor, and local pressure attenuation can easily occur during demolding, leading to secondary adhesion; third, the mechanical ejection mechanism is too rigid, which can easily cause compression damage to freeze-dried grains; fourth, the gas blowing and ejection actions lack coordinated control, which can easily lead to timing disorder or mismatch of effects; fifth, there is a lack of effective guiding and vibration damping structures between the mold and the material, which can easily cause jamming or displacement during demolding.

[0005] To address this issue, an air-blowing demolding structure for freeze-dried grain processing has been invented to solve the problems mentioned in the background art. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an air-blowing demolding structure for freeze-dried grain processing. Through the synergistic effect of the partitioned air supply structure of the gas distribution base, the uniformly distributed air-blowing hole design at the bottom of the mold shell, the elastic ejection drive component, and the guide support component, the freeze-dried grain can achieve uniform force, flexible ejection, and stable guidance during the demolding process.

[0007] Meanwhile, by controlling the timing of the solenoid valve and the ejection drive component through the control system, the blowing process and the ejection process can be coordinated in an orderly manner, thereby improving demolding efficiency and reducing the breakage rate of freeze-dried grain.

[0008] This application provides an air-blowing demolding structure for freeze-dried grain processing, employing the following technical solution: It includes a mold base, a gas distribution base, a mold shell, an ejection drive assembly, a guide support assembly, and a control system. The gas distribution base is positioned above the mold base and fixedly connected to it. The mold shell is positioned above the gas distribution base and forms a sealed sliding fit with it. The mold shell contains a cavity for shaping the freeze-dried grain. The ejection drive assembly is axially positioned above the mold base and passes through the mold shell. The guide support assembly is positioned between the gas distribution base and the mold shell and forms an axial guiding fit with it. The gas distribution base has an airflow channel connecting to an external gas source. The bottom of the mold shell has multiple air-blowing holes. Multiple solenoid valves are mounted on the gas distribution base. The control system is electrically connected to the solenoid valves and the ejection drive assembly, controlling the on / off states of the solenoid valves and the sequence of actions of the ejection drive assembly.

[0009] Optionally, the gas distribution base includes a base housing and an internal airflow cavity. The base housing is fixedly connected to the mold base by bolts, and the airflow cavity is connected to multiple solenoid valves through pipes.

[0010] Optionally, the air blowing holes at the bottom of the mold housing are evenly distributed in the bottom wall area, and the air blowing holes are connected to the airflow cavity inside the gas distribution base, and the gas sealing connection is achieved through a sealing gasket.

[0011] Optionally, the guide support assembly includes a reset spring, a guide rod, and a guide seat. The guide seat is fixedly disposed on the upper surface of the gas distribution base, the guide rod is slidably disposed inside the guide seat and fixedly connected to the bottom of the mold housing, and the reset spring is sleeved on the outer periphery of the guide rod and located between the guide seat and the mold housing.

[0012] Optionally, the ejection drive assembly includes a telescopic rod, a connecting cavity, a connecting spring, and an ejection rod. The telescopic rod is fixed to the mold base and extends upward along the axial direction. The connecting cavity is located at the top of the telescopic rod. The ejection rod is located inside the connecting cavity and penetrates the bottom of the mold housing. The connecting spring is located inside the connecting cavity and provides elastic support for the ejection rod.

[0013] Optionally, the top of the ejector rod has an arc-shaped structure and a silicone layer is provided on its outer surface.

[0014] Optionally, multiple vibration motors are evenly distributed below the mold housing. The vibration motors are fixed to the upper surface of the gas distribution base and form an indirect vibration transmission structure with the mold housing.

[0015] Optionally, the control system includes a controller, a drive module, and an execution interface module. The controller is electrically connected to the solenoid valve and the ejection drive component through the drive module, and executes the zoned air blowing control and ejection drive control sequentially according to a preset timing sequence.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up partitioned airflow channels and multiple solenoid valves in the gas distribution base, independent gas supply to the blowing holes at the bottom of the mold can be achieved, making the gas distribution more uniform and improving the consistency of demolding.

[0017] Second, by combining the evenly distributed air blowing holes at the bottom of the mold shell with the sealing gasket structure, the gas can form a stable gas film at the interface between the mold and the freeze-dried grain, effectively reducing adhesion and minimizing local residue.

[0018] Third, by setting up an elastic ejection drive component, the ejection process is changed from rigid pushing to elastic buffer ejection, which can significantly reduce the impact damage to the freeze-dried grain structure and improve the integrity of the finished product.

[0019] Fourth, the mold shell is axially guided and limited by the guide support component to avoid displacement or jamming during demolding and improve operational stability.

[0020] Fifth, by setting up a vibration motor to form an indirect vibration-assisted demolding structure, the static friction between the material and the mold can be effectively destroyed, thereby improving demolding efficiency.

[0021] VI. By controlling the timing of the opening of the solenoid valve in different zones and the ejection drive components through the control system, the coordinated action of air blowing, vibration and ejection can be achieved, thereby improving the continuity and reliability of the overall demolding process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the device; Figure 2 This is the front view of the device; Figure 3 This is a top view of the device; Figure 4 This is a cross-sectional schematic diagram of the overall structure of this device; Figure 5 This is a cross-sectional view of another overall structure of the device; Figure 6 This is a schematic diagram of the gas distribution base of this device; Among them, 1. Mold base, 2. Gas distribution base, 3. Mold shell, 4. Ejection drive assembly, 41. Telescopic rod, 42. Connecting cavity, 43. Connecting compression spring, 44. Ejection rod, 5. Guide support assembly, 51. Guide seat, 52. Guide rod, 53. Reset compression spring, 7. Vibration motor, 24. Solenoid valve, 22. Airflow cavity, 32. Air blowing hole. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] like Figures 1 to 5 As shown, a blow-out demolding structure for freeze-dried grain processing includes a mold base 1, a gas distribution base 2, a mold shell 3, an ejection drive assembly 4, a guide support assembly 5, a vibration motor 7, and a control system. The mold base 1 is a rectangular load-bearing structure integrally machined from 45# steel. Its upper surface is fixedly connected to the gas distribution base 2 by high-strength bolts. The bolts are used in conjunction with spring washers to achieve a non-loosening connection. At the same time, a fluororubber sealing gasket is sandwiched between the mold base 1 and the gas distribution base 2 to ensure the sealing of the gas system.

[0025] The gas distribution base 2 is located above the mold base 1. It includes a base housing 21 and an internal annular airflow chamber 22. The base housing 21 is formed by CNC machining of an aluminum alloy. The internal structure is formed by milling to create an annular flow-dividing airflow chamber. The airflow chamber 22 is connected to multiple solenoid valves 24 through a pipeline 23. The solenoid valves 24 are 24V direct-acting stainless steel solenoid valves and are fixed to the side wall mounting plate of the gas distribution base 2 by threaded installation. The input end of the solenoid valve 24 is connected to an external compressed air source through a quick-connect connector 25, thus forming a complete gas input system.

[0026] The mold housing 3 is positioned above the gas distribution base 2 and forms an axial sliding fit structure with it. The mold housing 3 is made of 304 stainless steel stamping and forming structure. Its interior forms a receiving cavity 31 for freeze-dried grain forming. Multiple air blowing holes 32 are evenly opened at the bottom of the mold housing 3. The air blowing holes 32 are connected to the air flow cavity 22 one by one. At the same time, the mold housing 3 and the gas distribution base 2 are slidably connected, so that the mold housing 3 can slide freely along the axis during the demolding process.

[0027] like Figure 6As shown, the guide support assembly 5 is disposed between the gas distribution base 2 and the mold housing 3. It includes a guide seat 51, a guide rod 52, and a reset spring 53. The guide seat 51 is fixed to the upper surface of the gas distribution base 2 by an M6 screw 54. The guide rod 52 is made of chrome-plated steel rod, and its lower end is fixed to the bottom mounting seat of the mold housing 3 by a threaded connection 55. The upper end of the guide rod 52 is inserted into the guide hole 511 of the guide seat 51 and forms a clearance fit sliding structure with the guide hole 511, thereby limiting the radial displacement of the mold housing 3 and preventing it from deflecting or jamming. At the same time, the reset spring 53 is sleeved on the outer periphery of the guide rod 52, with its upper end abutting against the lower end face of the guide seat 51 and its lower end abutting against the upper end of the mold housing 3, thereby providing axial reset elastic support force.

[0028] The ejection drive assembly 4 is located above the mold base 1 and extends axially through the interior of the mold housing 3. It includes a telescopic rod 41, a connecting cavity 42, a connecting spring 43, and an ejection rod 44. The telescopic rod 41 is an electric push rod structure and is fixed to the center of the mold base 1 with bolts. The connecting cavity 42 is fixedly connected to the output end of the telescopic rod 41 through a threaded structure. The ejection rod 44 is slidably disposed inside the connecting cavity 42 and extends through the bottom center area of ​​the mold housing 3. The connecting spring 43 is sleeved on the outer periphery of the ejection rod 44 and located between the upper and lower end faces inside the connecting cavity 42, so that the ejection rod 44 has elastic buffering characteristics during axial movement. The top of the ejection rod 44 is set as an arc-shaped structure and covered with a food-grade silicone layer 45. The silicone layer 45 has a thickness of 2 to 5 mm to achieve flexible contact and pushing with the freeze-dried food.

[0029] Vibration motors 7 are evenly arranged below the mold housing 3 and are fixed to the mounting base on the upper surface of the gas distribution base 2 by bolts 71. The vibration motors 7 adopt an eccentric block type DC vibration motor structure. Through its rotation, it generates vertical micro-amplitude high-frequency vibration, which is transmitted to the mold housing 3 through the gas distribution base 2, thereby reducing the static friction between the freeze-dried grain and the inner wall of the mold.

[0030] The control system includes a PLC controller, a relay module, a solenoid valve drive module, and a human-machine interface module. The PLC controller is electrically connected to the solenoid valve 24 and the telescopic rod 41 through the relay module to realize electrical isolation control and timing control.

[0031] During the control process, the PLC controller implements a pulse-type zone opening control strategy for the solenoid valve 24, that is, it periodically switches the solenoid valves of each zone on and off according to a preset time interval, so that the compressed air enters the blowing hole 32 through the airflow chamber 22 in the form of intermittent pulse airflow, thereby forming a dynamically changing intermittent air film layer at the bottom of the mold housing 3.

[0032] This pulsed air blowing method causes the air film pressure to fluctuate periodically between high and low states, thereby enhancing the peeling effect of the air film on the bottom adhesion interface of the freeze-dried grain, improving the intensity of micro-disturbance at the interface, and avoiding the problem of local air film stability adhesion caused by continuous constant pressure air supply.

[0033] The control system then starts the vibration motor 7, causing the mold shell 3 to generate micro-amplitude high-frequency vibration, in order to further reduce the static friction coefficient.

[0034] Finally, the control system drives the telescopic rod 41 to move, so that the ejector rod 44 can be ejected gradually under the elastic buffering action of the connecting spring 43, thereby completing the flexible demolding of the freeze-dried grain.

[0035] Throughout the entire process, the compressed air is transmitted through an external air source via quick-connect connector 25 into the airflow chamber 22, then distributed by solenoid valve 24 and acting on the bottom interface of the mold through air blowing hole 32 to form an air film layer. The ejection force is transmitted through a telescopic rod 41 driving the connecting spring 43 in the connecting chamber 42, which in turn pushes the ejection rod 44 to achieve axial ejection. The vibration is transmitted through a vibration motor 7 via gas distribution base 2 to the mold shell 3, thereby generating a slight disturbance to the freeze-dried grain. The guide support assembly 5 provides axial guidance and radial limitation for the mold shell 3 throughout the process, and the reset spring 53 provides reverse elastic support force to the mold shell 3, thereby ensuring that the mold shell 3 maintains a stable coaxial movement during demolding and avoiding displacement or jamming.

[0036] The working principle of this device has been explained through the above embodiments. These embodiments merely illustrate several implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An air-blowing demolding structure for freeze-dried grain processing, characterized in that, It includes a mold base (1), a gas distribution base (2), a mold shell (3), an ejection drive assembly (4), a guide support assembly (5), and a control system; The gas distribution base (2) is disposed above the mold base (1) and fixedly connected to the mold base (1). The mold shell (3) is disposed above the gas distribution base (2) and forms a sealed sliding fit structure with the gas distribution base (2). The mold shell (3) forms a cavity for forming freeze-dried grain inside. The ejection drive assembly (4) is axially positioned above the mold base (1) and passes through the mold housing (3); The guide support assembly (5) is disposed between the gas distribution base (2) and the mold housing (3) and forms an axial guide fit with the mold housing (3); The gas distribution base (2) is provided with an airflow channel (21) that connects to an external gas source. The bottom of the mold housing (3) is provided with multiple air blowing holes (31). The gas distribution base (2) is provided with multiple solenoid valves (22). The control system is electrically connected to the solenoid valve (22) and the ejector drive assembly (4) respectively, and is used to control the on / off of the solenoid valve (22) and the action sequence of the ejector drive assembly (4).

2. The air-blowing demolding structure for freeze-dried grain processing according to claim 1, characterized in that, The gas distribution base (2) includes a base housing (23) and an internal airflow cavity (24). The base housing (23) is fixedly connected to the mold base (1) by bolts, and the airflow cavity (24) is connected to multiple solenoid valves (22) by pipes.

3. The air-blowing demolding structure for freeze-dried grain processing according to claim 1, characterized in that, The air blowing holes (31) at the bottom of the mold housing (3) are evenly distributed in the bottom wall area. The air blowing holes (31) are connected to the airflow cavity (24) of the gas distribution base (2) and the gas sealing connection is achieved through the sealing gasket (32).

4. The air-blowing demolding structure for freeze-dried grain processing according to claim 1, characterized in that, The guide support assembly (5) includes a reset spring (51), a guide rod (52) and a guide seat (53). The guide seat (53) is fixedly disposed on the upper surface of the gas distribution base (2). The guide rod (52) is slidably disposed inside the guide seat (53) and fixedly connected to the bottom of the mold housing (3). The reset spring (51) is sleeved on the outer periphery of the guide rod (52) and located between the guide seat (53) and the mold housing (3).

5. The air-blowing demolding structure for freeze-dried grain processing according to claim 4, characterized in that, The guide rod (52) and the guide seat (53) form a linear sliding fit structure, and the maximum displacement range of the mold shell (3) in the axial direction is limited by the limiting structure.

6. The air-blowing demolding structure for freeze-dried grain processing according to claim 1, characterized in that, The ejection drive assembly (4) includes a telescopic rod (41), a connecting cavity (42), a connecting spring (43), and an ejection rod (44). The telescopic rod (41) is fixed on the mold base (1) and extends upward along the axial direction. The connecting cavity (42) is located at the top of the telescopic rod (41). The ejection rod (44) is located inside the connecting cavity (42) and passes through the bottom of the mold housing (3). The connecting spring (43) is located inside the connecting cavity (42) and provides elastic support for the ejection rod (44).

7. The air-blowing demolding structure for freeze-dried grain processing according to claim 6, characterized in that, The top of the ejector rod (44) is an arc-shaped structure and a silicone layer (45) is provided on the outer surface. The ejector rod (44) and the bottom of the mold shell (3) form a surface contact pushing structure.

8. The air-blowing demolding structure for freeze-dried grain processing according to claim 1, characterized in that, Multiple vibration motors (7) are evenly distributed below the mold housing (3). The vibration motors (7) are fixed on the upper surface of the gas distribution base (2) and form an indirect vibration transmission structure with the mold housing (3).

9. The air-blowing demolding structure for freeze-dried grain processing according to claim 1, characterized in that, The control system includes a controller, a drive module and an execution interface module. The controller is electrically connected to the solenoid valve (22) and the ejection drive assembly (4) through the drive module, and executes the zoned air blowing control and ejection drive control in sequence according to the preset timing.

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