Swing type tunnel quick-freezing device

Abstract

The invention provides a swing type tunnel quick freezing device which comprises a freezing tunnel, a chain plate type conveyor, a liquid nitrogen spraying mechanism, turn-over mechanisms, a first limiting rod and a second limiting rod, the chain plate type conveyor is installed in the freezing tunnel, each chain plate unit of the chain plate type conveyor is provided with the corresponding turn-over mechanism, and the first limiting rod is connected with the second limiting rod. The turn-over mechanism comprises a fixing plate, a torsional spring reset assembly, a first turn-over plate, a second turn-over plate and a limiting assembly. The first turning-over plate and the second turning-over plate sequentially deflect, so that the two sides of the fish aquatic products are subjected to liquid nitrogen sprayed by the first liquid nitrogen nozzle and the second liquid nitrogen nozzle correspondingly, quick freezing is achieved, the turning-over mechanism is compact in structure, and the fish aquatic products cannot be damaged in the turning-over process.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment, in particular to a swing-type tunnel quick-freezing device. Background Art

[0002] In the current field of aquatic product processing, quick freezing technology plays a vital role in maintaining the quality of aquatic products and extending their shelf life. Aquatic products such as fish are rich in nutrients such as protein and unsaturated fatty acids, but they are also very susceptible to microbial contamination and enzyme action and deterioration. Liquid nitrogen quick freezing technology, as a new quick freezing method, has gradually attracted attention. Liquid nitrogen has an extremely low temperature (boiling point is -196°C) and can take away the heat of aquatic products at an extremely fast speed to achieve rapid cooling. Using liquid nitrogen quick freezing, some aquatic products can be frozen in a short time, greatly shortening the time to pass through the maximum ice crystal formation zone, so that the water in the cells can evenly form fine ice crystals, which is effective. Effectively reduce damage to cells, thereby better maintaining the nutritional content, taste and original flavor of aquatic products. However, the existing liquid nitrogen quick-freezing equipment still has some problems in the quick-freezing process of fish and other aquatic products. The common liquid nitrogen spraying method cannot spray both sides of the aquatic products evenly, resulting in inconsistent freezing degrees on both sides of the aquatic products, which is prone to partial over-freezing and partial under-freezing, affecting the overall quick-freezing effect and product quality. At present, the flipping method is usually used to spray liquid nitrogen on both sides of fish and aquatic products separately, thereby ensuring uniform temperature inside the food and avoiding overcooling or unfrozen on one side. The common flipping mechanisms on the market are divided into the following two types: 1. Use mechanical grippers to clamp and rotate; in this method, the gripping force of the mechanical grippers cannot be reasonably controlled. If the gripping force is too large, the food may be crushed, and if it is too small, the food cannot be turned over, and the efficiency is low; 2. An inclined guide plate is set between the two conveyor belts. When entering from one conveyor belt to the other, the food is turned over under the action of the inclined guide plate. This method makes the quick-freezing tunnel larger, resulting in greater energy consumption, and the food that slides off the inclined guide plate is prone to rigid collision with each other, causing greater damage to the food. Summary of the invention

[0003] 1. Technical issues to be resolved In order to solve the above problems in the prior art, the present invention provides a swing-type tunnel quick-freezing device.

[0004] (II) Technical solution In order to achieve the above object, the main technical solutions adopted by the present invention include: A swing-type tunnel quick-freezing device comprises a freezing tunnel, a chain plate conveyor, a liquid nitrogen spraying mechanism, a turning mechanism, a first limiting rod and a second limiting rod; The chain plate conveyor is installed in the freezing tunnel, and each chain plate unit of the chain plate conveyor is equipped with the turning mechanism; The flipping mechanism comprises a fixing plate, a torsion spring reset assembly, a first flipping panel, a second flipping panel and a limit assembly; The fixed plate is vertically fixed on the surface of the chain plate unit of the chain plate conveyor; The limiting assembly is arranged between the first flip panel and the second flip panel; The torsion spring reset assembly is installed at both ends of the bottom of the first flip panel, and one end of the bottom of the first flip panel is connected to the fixed plate through the torsion spring reset assembly, and the other end of the bottom of the first flip panel is connected to the rotating seat through the torsion spring reset assembly; The length of the second flip panel is shorter than that of the first flip panel, and the second flip panel extends downward to below the chain plate unit. The chain plate unit of the chain plate conveyor is provided with an active hole corresponding to the second flip panel, and both sides of the second flip panel are rotatably connected to the inner wall of the active hole through a torsion spring reset assembly; Under the action of the torsion spring reset assembly, the first flip panel and the second flip panel are both deflected toward the direction of the limit assembly; The liquid nitrogen spraying mechanism comprises a first liquid nitrogen nozzle and a second liquid nitrogen nozzle, wherein a first quick-freezing station is located directly below the first liquid nitrogen nozzle, and a second quick-freezing station is located directly below the second liquid nitrogen nozzle; The first limit rod is installed at one side of the freezing tunnel and is arranged below the chain plate unit of the chain plate conveyor. The second flip panel moves to the first limit rod and flips in the conveying direction of the chain plate conveyor under the action of the first limit rod. The flipped second flip panel faces the first quick-freezing station. The second limit rod is installed on the other side of the freezing tunnel and is arranged above the chain plate unit of the chain plate conveyor. The second limit rod extends to the protruding part of the first flip panel compared to the second flip panel and is located above the limit assembly. The first flip panel moves to the second limit rod and is flipped in the conveying direction away from the chain plate conveyor under the action of the second limit rod. The flipped first flip panel faces the second quick-freezing station.

[0005] Preferably, the torsion spring reset assembly includes a rotating shaft and a torsion spring installed on the rotating shaft, both sides of the first flip panel or the second flip panel are rotatably connected to the connecting piece through the rotating shaft, one end force arm of the torsion spring is connected to the first flip panel or the second flip panel, and the other end force arm of the torsion spring is connected to the connecting piece.

[0006] Preferably, under the action of the limiting assembly, the first flip panel and the second flip panel are both perpendicular to the chain plate unit, and the limiting assembly includes a limiting seat, a transverse rack, a longitudinal rack, a limiting slider, a limiting spring and a driving gear; The limit seat is provided with a transverse movement slot, a longitudinal movement slot, a limit slot and a gear slot; The driving gear is rotatably mounted in the gear slot; The transverse rack is slidably installed in the transverse displacement groove, one end of the transverse rack extends out of the transverse displacement groove, the other end of the transverse rack is installed with the limiting slider, and the transverse rack is meshed above the driving gear; The longitudinal rack is slidably mounted in the longitudinal displacement groove and meshes with the driving gear on a side away from the transverse displacement groove opening. A triangular plate with an inclined surface facing the second flip panel is provided at one end of the top of the longitudinal rack, and the triangular plate extends out of the limit seat. The limiting slider is slidably installed in the limiting groove; The limit spring is installed in the limit groove, one end of the limit spring is connected to the limit sliding block, and the other end of the limit spring is connected to the inner wall of the limit groove.

[0007] Preferably, the horizontal plane where the bottom of the second limiting rod is located is at the same height as the horizontal plane where the upper surface of the limiting seat is located.

[0008] Preferably, it also includes a pre-cooling nozzle, which is installed inside the freezing tunnel near the entrance and is used to spray low-temperature nitrogen to the items in the turning mechanism.

[0009] Preferably, a limited flow channel is provided inside the freezing tunnel near the entrance and the exit, and when the chain plate unit of the chain plate conveyor enters the limited flow channel, the first flap panel and the fixed plate on the chain plate unit block the limited flow channel.

[0010] Preferably, the outer walls of the entrance and exit of the freezing tunnel are provided with wind curtains.

[0011] Preferably, the freezing tunnel is connected to a liquid nitrogen recovery mechanism, and a recovery nozzle of the liquid nitrogen recovery mechanism is arranged below the first quick-freezing station and the second quick-freezing station, and is located below the chain plate unit of the chain plate conveyor.

[0012] (III) Beneficial effects The beneficial effects of the present invention are: 1. The first flip panel and the second flip panel are deflected in sequence so that both sides of the fish and aquatic products can be sprayed by the first liquid nitrogen nozzle and the second liquid nitrogen nozzle respectively, so as to achieve quick freezing. The flipping mechanism used in the present application has a compact structure, and the flipping process will not cause damage to the fish and aquatic products; 2. The setting of the limit assembly makes the second flap panel swing toward the first flap panel at a certain angle before the first flap panel deflects, and the fish product with the top side against the second flap panel in the quick-freezing gap turns to the first flap panel and tilts, so that the top side is against the first flap panel, so as to cooperate with the deflection of the first flap panel to achieve flipping; 3. The first flap panel and the fixed plate on the chain plate unit can block the flow-limiting channel, preventing external air from entering the freezing tunnel, and preventing the external heat from affecting the temperature in the freezing tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a swing-type tunnel quick-freezing device; Figure 2 It is a schematic diagram of the internal structure of a swing-type tunnel quick-freezing device; Figure 3 It is a structural schematic diagram of the turning mechanism; Figure 4 A schematic diagram of the state change when the second flip panel moves to the first limit rod; Figure 5 A schematic diagram of the state change when the first flip panel moves to the second limit rod; Figure 6 It is a structural schematic diagram of the limit assembly; Figure 7 This is a schematic diagram of the state change of the second limiting rod pressing the limiting component.

[0014] Description of Reference Numerals 1. Chain plate conveyor; 101. Chain plate unit; 2. Freezing tunnel; 3. Turning mechanism; 31. First flip panel; 32. Second flip panel; 33. Fixed plate; 34. Limiting assembly; 341. Limiting seat; 342. Driving gear; 343. Horizontal rack; 344. Longitudinal rack; 345. Limiting slider; 346. Limiting spring; 347. Triangular plate; 35. Movable hole; 36. Torsion spring reset assembly; 4. Liquid nitrogen spraying mechanism; 41. First liquid nitrogen nozzle; 42. Second liquid nitrogen nozzle; 5. Pre-cooling nozzle; 6. The first limit rod; 7. Second limit rod. DETAILED DESCRIPTION

[0015] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0016] Please refer to Figures 1 to 5 , the first embodiment of the present invention: A swing-type tunnel quick-freezing device comprises a freezing tunnel 2, a chain plate conveyor 1, a liquid nitrogen spraying mechanism 4, a turning mechanism 3, a first limiting rod 6 and a second limiting rod 7; The chain plate conveyor 1 is installed in the freezing tunnel 2, and each chain plate unit 101 of the chain plate conveyor 1 is installed with a turning mechanism 3; The flip mechanism 3 includes a fixed plate 33, a torsion spring reset assembly 36, a first flip panel 31, a second flip panel 32 and a limit assembly 34; The fixed plate 33 is vertically fixed on the surface of the chain plate unit 101 of the chain plate conveyor 1; The limiting component 34 is disposed between the first flip panel 31 and the second flip panel 32; Torsion spring reset assemblies 36 are installed at both ends of the bottom of the first flip panel 31, and one end of the bottom of the first flip panel 31 is connected to the fixed plate 33 through the torsion spring reset assembly 36, and the other end of the bottom of the first flip panel 31 is connected to the rotating seat through the torsion spring reset assembly 36; The length of the second flap panel 32 is shorter than that of the first flap panel 31, and the second flap panel 32 extends downward to below the chain plate unit 101. The chain plate unit 101 of the chain plate conveyor 1 is provided with a movable hole 35 corresponding to the second flap panel 32, and both sides of the second flap panel 32 are rotatably connected to the inner wall of the movable hole 35 through a torsion spring reset assembly 36; Under the action of the torsion spring reset assembly 36, the first flip panel 31 and the second flip panel 32 are both deflected toward the limit assembly 34; The liquid nitrogen spraying mechanism 4 includes a first liquid nitrogen nozzle 41 and a second liquid nitrogen nozzle 42. The first quick-freezing station is located directly below the first liquid nitrogen nozzle 41, and the second quick-freezing station is located directly below the second liquid nitrogen nozzle 42. The first limiting rod 6 is installed on one side of the freezing tunnel 2 and is arranged below the chain plate unit 101 of the chain plate conveyor 1. The second flip panel 32 moves to the first limiting rod 6 and flips in the conveying direction of the chain plate conveyor 1 under the action of the first limiting rod 6. The flipped second flip panel 32 faces the first quick-freezing station. The second limiting rod 7 is installed at the other side of the freezing tunnel 2 and is arranged above the chain plate unit 101 of the chain plate conveyor 1. The second limiting rod 7 extends to the protruding part of the first flap panel 31 compared to the second flap panel 32 and is located above the limiting assembly 34. The first flap panel 31 moves to the second limiting rod 7 and is flipped in the conveying direction away from the chain plate conveyor 1 under the action of the second limiting rod 7. The flipped first flap panel 31 faces the second quick-freezing station. When in use, the fish and aquatic products to be frozen are placed in the freezing gap formed by the first flap panel 31 and the second flap panel 32. As the chain plate conveyor 1 enters the freezing tunnel 2, the chain plate unit 101 continues to move forward until the bottom of the second flap panel 32 contacts the first limit rod 6. Under the obstruction of the first limit rod 6, the second flap panel 32 swings in the conveying direction of the chain plate conveyor 1, and the fish and aquatic products in the freezing gap also fall onto the second flap panel 32 as the second flap panel 32 swings, and at this time, they are just located at the first quick-freezing station, and can cooperate with the first liquid nitrogen nozzle 41 to quickly freeze one side of the fish and aquatic products, and then as the chain plate conveyor 1 continues to transport The bottom of the second flip panel 32 is separated from the first limit rod 6. Under the action of the torsion spring reset assembly 36, the second flip panel 32 is reset, and the fish and aquatic products return to the freezing gap. As the chain plate conveyor 1 continues to move forward, when the first flip panel 31 contacts the second limit rod 7, the first flip panel 31 is blocked by the second limit rod 7 and deflects in the conveying direction away from the chain plate conveyor 1. The fish and aquatic products fall onto the first flip panel 31 as the first flip panel 31 swings, and at this time, they are just located at the second quick-freezing station, and the second liquid nitrogen nozzle 42 is used to quickly freeze the other side of the fish and aquatic products, so as to achieve quick freezing of both sides of the fish and aquatic products to be frozen.

[0017] In this embodiment, the torsion spring reset assembly 36 includes a rotating shaft and a torsion spring mounted on the rotating shaft. Both sides of the first flip panel 31 or the second flip panel 32 are rotatably connected to the connecting member through the rotating shaft. One end of the torsion spring is connected to the first flip panel 31 or the second flip panel 32 by a force arm, and the other end of the torsion spring is connected to the connecting member by a force arm. When in use, the rotating shaft is used to realize the rotation connection of the flip panel, and the torsion spring is used to ensure that the flip panel is automatically reset after being swung by an external force.

[0018] refer to Figure 6 and Figure 7 , the second embodiment of the present invention: On the basis of the above-mentioned embodiment 1, the limiting assembly 34 includes a limiting seat 341, a transverse rack 343, a longitudinal rack 344, a limiting slider 345, a limiting spring 346 and a driving gear 342; The limiting seat 341 is provided with a transverse movement slot, a longitudinal movement slot, a limiting slot and a gear slot; The driving gear 342 is rotatably mounted in the gear groove; The transverse rack 343 is slidably installed in the transverse slot, one end of the transverse rack 343 extends out of the transverse slot, the other end of the transverse rack 343 is installed with a limit slider 345, and the transverse rack 343 is meshed above the driving gear 342; The longitudinal rack 344 is slidably installed in the longitudinal slot and meshes with the side of the driving gear 342 away from the opening of the transverse slot. A triangular plate 347 with an inclined surface facing the second flip panel 32 is provided at one end of the top of the longitudinal rack 344, and the triangular plate 347 extends out of the limit seat 341. The limiting slider 345 is slidably installed in the limiting groove; The limiting spring 346 is installed in the limiting groove, one end of the limiting spring 346 is connected to the limiting slider 345, and the other end of the limiting spring 346 is connected to the inner wall of the limiting groove; After the fish and aquatic products are poured onto the second flip panel 32 and the second flip panel 32 is reset as the chain plate conveyor 1 continues to convey them, the top side of the fish and aquatic products will habitually stick to the second flip panel 32, which makes it difficult for them to follow the deflection of the first flip panel 31 to turn over. In this embodiment, before the second limiting rod 7 contacts the first flip panel 31, it will first contact the inclined surface of the triangular plate 347. As the chain plate conveyor 1 moves forward, the second limiting rod 7 will press the triangular plate 347 to drive the longitudinal rack 344 to move downward. Under the action of the driving gear 342, the transverse rack 343 shrinks inward. At this time, the second flip panel 32 loses the restriction of the transverse rack 343 and swings toward the first flip panel 31. This can make the fish product with one side of the top attached to the second flip panel 32 turn to the first flip panel 31 and tilt, so that the top side of the fish product is attached to the first flip panel 31, so as to cooperate with the swing of the first flip panel 31 to achieve flipping.

[0019] In this embodiment, the horizontal plane where the bottom of the second limiting rod 7 is located is at the same height as the horizontal plane where the upper surface of the limiting seat 341 is located.

[0020] In this embodiment, a pre-cooling nozzle 5 is also included. The pre-cooling nozzle 5 is installed inside the freezing tunnel 2 near the entrance. The pre-cooling nozzle 5 is used to spray low-temperature nitrogen to the items in the turning mechanism 3, and pre-cool the items with low-temperature nitrogen to avoid cracking caused by excessive temperature difference of the food.

[0021] In this embodiment, a limited flow channel is provided near the entrance and the exit of the freezing tunnel 2. When the chain plate unit 101 of the chain plate conveyor 1 enters the limited flow channel, the first flap panel 31 and the fixed plate 33 on the chain plate unit 101 block the limited flow channel. When the wind shield is opened during the transportation of food, outside air will continue to enter the quick-freezing tunnel, and the setting of the first flip panel 31 can block outside air from entering the freezing tunnel 2, preventing the outside heat from affecting the temperature inside the freezing tunnel 2.

[0022] In this embodiment, the outer walls of the entrance and exit of the freezing tunnel 2 are provided with wind curtains to isolate the freezing tunnel 2 from the outside.

[0023] In this embodiment, the freezing tunnel 2 is connected to a liquid nitrogen recovery mechanism, and a recovery nozzle of the liquid nitrogen recovery mechanism is arranged below the first quick freezing station and the second quick freezing station, and is located below the chain plate unit 101 of the chain plate conveyor 1.

[0024] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

[0025] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A swing-type tunnel quick-freezing device, characterized in that: It includes a freezing tunnel, a chain plate conveyor, a liquid nitrogen spraying mechanism, a turning mechanism, a first limiting rod and a second limiting rod; The chain plate conveyor is installed in the freezing tunnel, and each chain plate unit of the chain plate conveyor is equipped with the turning mechanism; The flipping mechanism comprises a fixing plate, a torsion spring reset assembly, a first flipping panel, a second flipping panel and a limit assembly; The fixed plate is vertically fixed on the surface of the chain plate unit of the chain plate conveyor; The limiting assembly is arranged between the first flip panel and the second flip panel; The torsion spring reset assembly is installed at both ends of the bottom of the first flip panel, and one end of the bottom of the first flip panel is connected to the fixed plate through the torsion spring reset assembly, and the other end of the bottom of the first flip panel is connected to the rotating seat through the torsion spring reset assembly; The length of the second flip panel is shorter than that of the first flip panel, and the second flip panel extends downward to below the chain plate unit. The chain plate unit of the chain plate conveyor is provided with an active hole corresponding to the second flip panel, and both sides of the second flip panel are rotatably connected to the inner wall of the active hole through a torsion spring reset assembly; Under the action of the torsion spring reset assembly, the first flip panel and the second flip panel are both deflected toward the direction of the limit assembly; The liquid nitrogen spraying mechanism comprises a first liquid nitrogen nozzle and a second liquid nitrogen nozzle, wherein a first quick-freezing station is located directly below the first liquid nitrogen nozzle, and a second quick-freezing station is located directly below the second liquid nitrogen nozzle; The first limit rod is installed at one side of the freezing tunnel and is arranged below the chain plate unit of the chain plate conveyor. The second flip panel moves to the first limit rod and flips in the conveying direction of the chain plate conveyor under the action of the first limit rod. The flipped second flip panel faces the first quick-freezing station. The second limit rod is installed on the other side of the freezing tunnel and is arranged above the chain plate unit of the chain plate conveyor. The second limit rod extends to the protruding part of the first flip panel compared to the second flip panel and is located above the limit assembly. The first flip panel moves to the second limit rod and is flipped in the conveying direction away from the chain plate conveyor under the action of the second limit rod. The flipped first flip panel faces the second quick-freezing station.

2. A swing-type tunnel quick-freezing device according to claim 1, characterized in that: The torsion spring reset assembly includes a rotating shaft and a torsion spring installed on the rotating shaft. Both sides of the first flip panel or the second flip panel are rotatably connected to the connecting piece through the rotating shaft. One end force arm of the torsion spring is connected to the first flip panel or the second flip panel, and the other end force arm of the torsion spring is connected to the connecting piece.

3. The swing-type tunnel quick-freezing device according to claim 1, characterized in that: Under the limiting action of the limiting assembly, the first flip panel and the second flip panel are both perpendicular to the chain plate unit, and the limiting assembly includes a limiting seat, a transverse rack, a longitudinal rack, a limiting slider, a limiting spring and a driving gear; The limit seat is provided with a transverse movement slot, a longitudinal movement slot, a limit slot and a gear slot; The driving gear is rotatably mounted in the gear slot; The transverse rack is slidably installed in the transverse displacement groove, one end of the transverse rack extends out of the transverse displacement groove, the other end of the transverse rack is installed with the limiting slider, and the transverse rack is meshed above the driving gear; The longitudinal rack is slidably mounted in the longitudinal displacement groove and meshes with the driving gear on a side away from the transverse displacement groove opening. A triangular plate with an inclined surface facing the second flip panel is provided at one end of the top of the longitudinal rack, and the triangular plate extends out of the limit seat. The limiting slider is slidably installed in the limiting groove; The limit spring is installed in the limit groove, one end of the limit spring is connected to the limit sliding block, and the other end of the limit spring is connected to the inner wall of the limit groove.

4. The swing-type tunnel quick-freezing device according to claim 3, characterized in that: The horizontal plane where the bottom of the second limiting rod is located is at the same height as the horizontal plane where the upper surface of the limiting seat is located.

5. The swing-type tunnel quick-freezing device according to claim 1, characterized in that: It also includes a pre-cooling nozzle, which is installed inside the freezing tunnel near the entrance and is used to spray low-temperature nitrogen to the items in the turning mechanism.

6. The swing-type tunnel quick-freezing device according to claim 1, characterized in that: A limited flow channel is arranged near the entrance and the exit inside the freezing tunnel. When the chain plate unit of the chain plate conveyor enters the limited flow channel, the first flap panel and the fixed plate on the chain plate unit block the limited flow channel.

7. The swing-type tunnel quick-freezing device according to claim 1, characterized in that: The outer walls of the entrances and exits of the freezing tunnel are all provided with wind screens.

8. The swing-type tunnel quick-freezing device according to claim 1, characterized in that: The freezing tunnel is connected to a liquid nitrogen recovery mechanism, and a recovery nozzle of the liquid nitrogen recovery mechanism is arranged below the first quick freezing station and the second quick freezing station, and is located below the chain plate unit of the chain plate conveyor.

Images