Tunnel type quick freezing device with multiple layers of conveying belts

Abstract

The invention discloses a tunnel type quick-freezing device with multiple layers of conveying belts, and relates to the technical field of refrigerators, the tunnel type quick-freezing device is used for food freezing processing, the tunnel type quick-freezing device comprises a refrigerator and a conveying mechanism, the conveying mechanism is formed by combining a chain transmission mechanism and a plurality of bearing plates, and the bearing plates are sequentially arranged on the moving track of the chain transmission mechanism; the conveying mechanism comprises conveying channels arranged on the quick-freezing tunnel, a first conveying branch chain and a second conveying branch chain are arranged between the conveying channels, and a limiting plate is arranged at the end, close to the second conveying branch chain, of the first conveying branch chain; and in the stroke of the food from the first conveying branch chain to the second conveying branch chain, the limiting plate is matched with the first conveying branch chain to turn over the food.

Description

Technical Field

[0001] The invention relates to the technical field of freezers, in particular to a tunnel-type quick-freezing device with multi-layer conveyor belts. Background Art

[0002] As is known, tunnel-type quick-freezing devices are a type of quick-freezing equipment widely used in the food processing industry. They include: air convection refrigeration, in which the refrigeration system generates low-temperature air, which is blown toward the conveyor belt and the food on it in the tunnel through a fan, so that the food is quickly cooled and frozen; liquid nitrogen refrigeration, in which some tunnel-type quick-freezing devices use liquid nitrogen as a refrigerant. Liquid nitrogen vaporizes at extremely low temperatures and absorbs heat, which rapidly reduces the temperature in the tunnel and achieves rapid freezing.

[0003] Among them, liquid nitrogen refrigeration for quick freezing of food not only has a good quick freezing effect, but also has a very high quick freezing efficiency. However, due to the different sizes and structures of different objects, the required liquid nitrogen freezing time is also different. Simply freezing with liquid nitrogen may cause waste or insufficient freezing, which may cause the temperature of the frozen object to be too low or only freeze the surface, which cannot meet the freezing requirements of cold chain preservation. Therefore, in order to solve the above problems, a patent with the announcement number CN115183513B and the announcement date of December 15, 2023, entitled "A Ultra-low Temperature Tunnel-type Quick Freezer for Cold Chain Preservation and Quick Freezing", relates to the technical field of quick freezing machines, including a first box, a second box, a driving assembly and a freezing assembly. The bottom of the first box is equipped with support legs, and the top of the first box is fixedly equipped with a second box. The first box and the second box are equipped with a driving assembly, and the driving assembly is used to transport the fresh products in one direction. Several groups of freezing assemblies are fixedly installed on the top of the second box, and the freezing assembly is used to freeze the fresh products on the driving assembly. Multiple groups of freezing assemblies freeze the fresh products by step-by-step freezing. Driven by the driving assembly, multiple groups of interconnected freezing assemblies are set up and the fresh products are frozen by step-by-step freezing, which greatly improves the utilization rate of liquid nitrogen. At the same time, step-by-step freezing can make the temperature of the outside and inside of the fresh products tend to be consistent.

[0004] A shortcoming of the prior art, including the aforementioned, is that the low-temperature gas circulates within the quick-freezing device, but does not simultaneously cool and freeze both sides of the food. Consequently, when freezing some thick slices of food, the side of the food directly exposed to the low-temperature gas may be overcooled, while the other side remains unfrozen. Overcooling can damage the cells of fresh food, while remaining unfrozen can affect the food's freshness. Therefore, a tunnel-type quick-freezing device is needed that can flip thick slices of food during the freezing process. Summary of the Invention

[0005] The purpose of the present invention is to provide a tunnel-type quick-freezing device with a multi-layer conveyor belt to solve the technical problems in the related art. In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A tunnel-type quick-freezing device with a multi-layer conveyor belt is used for freezing food, comprising a refrigerator and a conveying mechanism, wherein the conveying mechanism is composed of a chain transmission mechanism and a plurality of support plates, and the plurality of support plates are arranged in sequence on the running track of the chain transmission mechanism. The conveying mechanism comprises a conveying channel provided on the quick-freezing tunnel, wherein a first conveying branch chain and a second conveying branch chain are provided between the conveying channels, and a limit plate is provided at one end of the first conveying branch chain close to the second conveying branch chain; during the journey of the food from the first conveying branch chain to the second conveying branch chain, the limit plate cooperates with the first conveying branch chain to turn the food over.

[0007] As mentioned above, the limit plate is slidably arranged on the conveying channel, and an adjusting bolt is provided between the limit plate and the conveying channel.

[0008] As mentioned above, the several supporting plates on the first conveyor branch chain are divided into several groups, each group includes a main board and multiple sub-boards, and mounting seats are arranged at both ends of the main board and the sub-boards, and the mounting seats are fixedly connected to the chain transmission mechanism. Each main board is swingably arranged on the corresponding two mounting seats, and at the swinging position, a first elastic member is provided between the main board and the corresponding mounting seat, and an extrusion member is installed on the sprocket rotating shaft of the first conveyor branch chain close to the second conveyor branch chain; the main board swings based on the extrusion action of the extrusion member to prevent food from sliding at the turning point of one end of the first conveyor branch chain close to the second conveyor branch chain.

[0009] As mentioned above, the mounting seat is provided with a side stop that prevents food from contacting the chain transmission mechanism.

[0010] As mentioned above, the main board is composed of an outer board and an inner board, and has a V-shaped structure as a whole; when not squeezed by the extrusion part, the outer board remains flush with the surface of the sub-board in the same group; when squeezed by the extrusion part, the inner board remains flush with the surface of the sub-board in the same group.

[0011] As mentioned above, a baffle is also slidably provided on the conveying channel, and a second elastic member is provided between the baffle and the conveying channel in the sliding direction. When the main board is squeezed by the squeezing member, the baffle pushes the food on the main board away.

[0012] As mentioned above, the extrusion member includes an extrusion base installed on the sprocket rotating shaft of the first conveying branch chain close to the second conveying branch chain, and a plurality of first extrusion blocks are arranged in sequence on the circumference of the extrusion base, and a first transmission block is slidingly provided on the mounting seat corresponding to the main board. The first transmission block drives the main board to swing based on the extrusion action of the first extrusion block.

[0013] The sub-plate comprises two parts arranged to swing on the corresponding mounting seat, and at the swing position, a third elastic member is provided between each part of the sub-plate and the corresponding mounting seat, and each part of the sub-plate swings based on the swing action of the main plate.

[0014] As mentioned above, the first extrusion block is arranged to slide on the extrusion base, and in the sliding direction, a fourth elastic member is provided between the first extrusion block and the extrusion base. Based on the elastic force of the fourth elastic member, the first extrusion block tends to move away from the extrusion base.

[0015] As mentioned above, each of the first extrusion blocks connected to the end of the fourth elastic member is provided with an extension portion, and a blocking portion is provided at the position of the extrusion base corresponding to each first extrusion block; each first extrusion block includes two extrusion strokes when extruding the first transmission block: in the first stroke, before the extension portion is blocked by the blocking portion, based on the elastic force of the fourth elastic member, the first extrusion block produces elastic extrusion on the first transmission block; in the second stroke, the extension portion is blocked by the blocking portion, and the first extrusion block is forced to squeeze the first transmission block.

[0016] The beneficial effect of the present invention is that: by setting a limit plate, when the food reaches the end position of the first conveyor branch chain close to the second conveyor branch chain, it will follow the end of the first conveyor branch chain to turn, and the limit plate will prevent the food from directly flipping and falling from the end of the first conveyor branch chain, and the food will fall onto the second conveyor branch chain after following the first conveyor branch chain to turn. At this time, the food is turned over, so that the side of the food on the first conveyor branch chain that is directly blown by the cold air is frozen first, and the other side is frozen on the second conveyor branch chain, thereby ensuring uniform freezing of the food and improving the food freezing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a tunnel-type quick-freezing device with a multi-layer conveyor belt provided in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the internal structure of a conveying mechanism of a tunnel-type quick-freezing device with a multi-layer conveyor belt provided in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the cross-sectional structure of a conveying mechanism of a tunnel-type quick-freezing device with a multi-layer conveyor belt provided in an embodiment of the present invention;

[0021] Figure 4 for Figure 3 A in the figure shows the enlarged structural diagram;

[0022] Figure 5 A schematic cross-sectional view of a group of supporting plates of a tunnel-type quick-freezing device with a multi-layer conveyor belt provided in an embodiment of the present invention when working in coordination;

[0023] Figure 6 This is a schematic diagram of an exploded structure from a first perspective of one set of support plates of a tunnel-type quick-freezing device with a multi-layer conveyor belt provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the exploded structure from a second perspective of one group of support plates of a tunnel-type quick-freezing device with a multi-layer conveyor belt provided in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Refrigerator; 2. Conveying mechanism; 20. Conveying channel; 21. First conveying branch chain; 22. Second conveying branch chain; 23. Limiting plate; 24. Main plate; 240. External plate; 241. Internal plate; 25. Sub-plate; 26. Mounting seat; 27. Side stop; 28. Stop bar; 29. ​​Extrusion base; 30. First extrusion block; 300. Extension; 301. Blocking part; 31. First transmission block; 32. Second extrusion block; 33. Second transmission block; 34. Pressure block; 35. Third extrusion block. DETAILED DESCRIPTION

[0027] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 7 The present invention is further described in detail.

[0028] In an embodiment of the present invention, a tunnel-type quick-freezing device with a multi-layer conveyor belt is provided, which is used for freezing food, including a refrigerator 1 and a conveying mechanism 2. The conveying mechanism 2 is composed of a chain transmission mechanism and a plurality of support plates. The plurality of support plates are arranged in sequence on the running track of the chain transmission mechanism. The conveying mechanism 2 includes a conveying channel 20 provided on the quick-freezing tunnel, and a first conveying branch chain 21 and a second conveying branch chain 22 are provided between the conveying channel 20. A limit plate 23 is provided at one end of the first conveying branch chain 21 close to the second conveying branch chain 22; in the process of food from the first conveying branch chain 21 to the second conveying branch chain 22, the limit plate 23 cooperates with the first conveying branch chain 21 to turn the food over.

[0029] Specifically, the refrigerator 1 uses liquid nitrogen for cooling and uses a fan to circulate the cold air in the tunnel-type quick-freezing device. For ease of description and understanding, in this embodiment and subsequent embodiments, the cold air circulates from top to bottom through the conveying mechanism 2, that is, the cold air circulation direction is set to a first direction (such as vertically from top to bottom), and the food conveying direction is set to a second direction (such as horizontally from left to right). The direction on the conveying mechanism 2 that is perpendicular to the food conveying direction on the same horizontal plane is the third direction, which can also be understood as the width direction of the conveying mechanism 2. The food that needs to be frozen is in the form of thick slices, and the turning points of the first conveying branch 21 involved subsequently all refer to the position where the first conveying branch 21 turns near one end of the second conveying branch 22.

[0030] The conveying mechanism 2 is powered by a driving motor and a chain transmission mechanism for conveying food. The chain transmission mechanism is provided with a number of supporting plates, which are flat strip-shaped structures. There is a gap between two adjacent supporting plates for cold air to pass through. Meshes for cold air to pass through can also be provided on the supporting plates (not specifically shown in the figure). When the food needs to be frozen, the food is spread on the supporting plates in a single layer in turn, and the driving motor is used to drive the chain transmission mechanism to transport the food to the cold air circulation path. After the cold air contacts the food, it will use the low temperature to freeze the food. However, in the prior art, the cold air does not cool and freeze both sides of the food at the same time during the circulation process. Therefore, when freezing some thick sliced ​​foods, the food will be overcooled on the side directly blown by the low-temperature gas from the time it enters the tunnel-type quick-freezing device to the time it leaves. The other side has not yet frozen. Overcooling will damage the cells of the fresh food, and if it is not frozen, it will affect the preservation of the food.

[0031] Therefore, in response to the above technical problems, in this embodiment, the chain transmission mechanism in the conveying mechanism 2 is split into at least two sets, namely, a first conveying branch chain 21 and a second conveying branch chain 22, both of which are composed of a chain transmission mechanism and a paved support plate. In the first direction, the second conveying branch chain 22 is located below the first conveying branch chain 21, and the projections of the two adjacent ends overlap, that is, along the second direction, the food dropped from the first conveying branch chain 21 will fall on the second conveying branch chain 22. Therefore, by utilizing this characteristic, when the first conveying branch chain 21 is close to the second conveying branch chain 22, the second conveying branch chain 22 is located below the first conveying branch chain 21. A limiting plate 23 is provided at one end of the conveying branch chain 22. Because in the process of food falling from the first conveying branch chain 21 to the second conveying branch chain 22, the food is basically in a relatively hard state after being frozen during the conveying process of the first conveying branch chain 21, and it is difficult to deform easily. When the food falls, it will turn over due to gravity. The angle of the turning affects its posture when it falls on the second conveying branch chain 22. That is, when falling on the second conveying branch chain 22, the food just completes a 180-degree turn, or it may not be completely turned over and fall on the second conveying branch chain 22 to cause stacking, or it may not turn over at all. In order to basically ensure that the food can be turned over 180 degrees, a limit plate 23 is set to block and limit the food during its falling process, so that it cannot temporarily or completely break away from the supporting plate on the first conveying branch chain 21. When the food follows the end of the first conveying branch chain 21 to turn more than 90 degrees or even more (less than or equal to 180 degrees), the limit plate 23 will lose its blocking and limiting effect on the food. At this time, the food can be turned over 180 degrees and fall on the supporting plate of the second conveying branch chain 22. The limit plate 23 is an arc-shaped structure, and the arc is adapted to the first conveying branch chain 21. The arc length of the end of a conveyor branch chain 21 is between one-third of a circle and one-half of a circle. Before the food passes through the starting point of the turning point of the first conveyor branch chain 21 to the end of a quarter circle, the food tends to stick to the first conveyor branch chain 21. After passing a quarter circle, the turning direction of the first conveyor branch chain 21 is gradually opposite to the second direction, and the food tends to fall off the first conveyor branch chain 21. In this way, the structural characteristics of the limiting plate 23 are utilized to ensure that the food can be smoothly turned 180 degrees and fall onto the second conveyor branch chain 22 for further freezing processing.

[0032] The beneficial effect of this embodiment is that: by setting the limit plate 23, when the food reaches the end position of the first conveyor branch chain 21 close to the second conveyor branch chain 22, it will follow the end of the first conveyor branch chain 21 to turn, and the limit plate 23 will prevent the food from directly flipping and falling from the end of the first conveyor branch chain 21, and the food will fall onto the second conveyor branch chain 22 after turning with the first conveyor branch chain 21. At this time, the food is turned over, so that the side of the food on the first conveyor branch chain 21 that is directly blown by the cold air is frozen first, and the other side is frozen on the second conveyor branch chain 22, thereby ensuring that the freezing of the food is uniform and improving the food freezing effect.

[0033] Preferably, the limit plate 23 is slidably arranged on the conveying channel 20, and an adjusting bolt is provided between the limit plate 23 and the conveying channel 20; specifically, a slide is provided on the conveying channel 20 for the limit plate 23 to move along the second direction, and a slider is slidably provided in the slide. The limit plate 23 is fixed to the slider by bolts, and an adjusting bolt is provided between the slider and the conveying channel 20. By rotating the adjusting bolt, the distance between the limit plate 23 and the turning point of the first conveying branch chain 21 can be adjusted to adapt to the flipping of thick-cut foods of different sizes.

[0034] Furthermore, the several supporting plates on the first conveying branch chain 21 are divided into several groups, each group includes a main plate 24 and multiple sub-plates 25, and mounting seats 26 are arranged at both ends of the main plate 24 and both ends of the sub-plates 25. The mounting seats 26 are fixed to the chain transmission mechanism. Each main plate 24 is swingably arranged on the corresponding two mounting seats 26, and at the swinging position, a first elastic member is provided between the main plate 24 and the corresponding mounting seat 26, and an extrusion member is installed on the sprocket rotating shaft of the first conveying branch chain 21 close to the second conveying branch chain 22; the main plate 24 swings based on the extrusion action of the extrusion member to prevent food from slipping at the turning point of one end of the first conveying branch chain 21 close to the second conveying branch chain 22.

[0035] Specifically, when the food passes through the position between the bend of the first conveyor branch 21 and the limit plate 23, it tends to fall along the first direction due to gravity, and the front and rear adjacent foods may come into contact. Then, when falling onto the second conveyor branch 22, the previous food falls onto the second conveyor branch 22 first, and before it is completely away from the corresponding part of the limit plate 23 in the first direction, the next food may fall on the previous food, resulting in the situation that the food is stacked in the first direction, which is obviously not conducive to food freezing processing.

[0036] Therefore, in this embodiment, a swingable main board 24 is provided to block the front and rear adjacent foods, thereby preventing the foods from sliding down at the bend at one end of the first conveyor branch chain 21 close to the second conveyor branch chain 22, that is, the plurality of supporting plates arranged on the first conveyor branch chain 21 are grouped, and each group of supporting plates includes a main board 24 and a plurality of sub-boards 25. In the direction of travel of the first conveyor branch chain 21, the main board 24 in each group is located in front of the plurality of sub-boards 25. The main board 24 is provided with mounting seats 26 at both ends in the third direction. The mounting seats 26 are fixed to the chain transmission mechanism by bolts, and each sub-board 25 is also arranged on the chain transmission mechanism in this way. The main board 24 is swingably arranged on the corresponding mounting seat 26, and utilizes the elastic force of the first elastic member to keep the surface of the main board 24 holding food substantially flush with the surface of the sub-board 25 holding food before reaching the turning point of the first conveying branch chain 21. In order to achieve the purpose of blocking the front and rear adjacent foods, an extrusion member is installed on the sprocket rotating shaft of the first conveying branch chain 21 close to the second conveying branch chain 22. Utilizing the extrusion effect of the extrusion member, the main board 24 can swing and tilt when reaching the turning point of the first conveying branch chain 21, thereby blocking the front and rear adjacent foods and preventing the foods from sliding down at the turning point of one end of the first conveying branch chain 21 close to the second conveying branch chain 22, thereby avoiding the above-mentioned problem.

[0037] In an optional embodiment, a side stop 27 is provided on the mounting seat 26 to prevent food from contacting the chain transmission mechanism. That is, when the food passes through the bend of the first conveying branch chain 21, it may move along the third direction due to sliding. In order to prevent the food from contacting the chain transmission mechanism, a side stop 27 is provided on the mounting seat 26. In addition, in order to prevent the main board 24 from being squeezed and swung up by the extrusion member, the food may fall out of the gap formed after the main board 24 is lifted up, in a preferred embodiment, the main board 24 is composed of an outer plate 240 and an inner plate 241, and the whole is a V-shaped structure; when not squeezed by the extrusion member, the outer plate 240 remains flush with the surface of the sub-plate 25 of the same group. When squeezed by the extrusion member, the inner plate 241 remains flush with the surface of the sub-plate 25 of the same group. In this way, the inner plate is used to make up for the gap formed after the outer plate 240 swings and lifts, so as to prevent food from falling.

[0038] Furthermore, a baffle 28 is slidably provided on the conveying channel 20, and a second elastic member is provided between the baffle 28 and the conveying channel 20 in the sliding direction. When the main board 24 is squeezed by the squeezing member, the baffle 28 pushes the food on the main board 24 away.

[0039] Specifically, when the food is laid on the first conveyor branch chain 21, the surface of the outer plate 240 of the main plate 24 is basically flush with the surface of the sub-plate 25, and the laying of the food is also random, that is, the food is laid on the main plate 24, and the main plate 24 needs to be swung and tilted, then the food on the main plate 24 is still in contact with the previous food, and the problem of stacking will occur later.

[0040] Therefore, in this embodiment, after the main board 24 swings and tilts up, the baffle 28 is used to push the food on it in the opposite direction of the second direction, so that the food is separated from the main board 24, that is, the position of the baffle 28 is between the first quarter circle of the turning point of the first conveying branch chain 21. When the main board 24 is about to follow the first conveying branch chain 21 to turn, the main board 24 has also been completely tilted up. The tilted main board 24 will produce an extrusion effect on the baffle 28, and then the elastic force of the second elastic member is used to elastically contact between the baffle 28 and the external plate 240, which does not affect the movement of the main board 24 and can also push the food laid on the main board 24 away.

[0041] In a preferred embodiment, the extrusion member includes an extrusion base 29 installed on the sprocket rotating shaft of the first conveying branch chain 21 close to the second conveying branch chain 22, and a plurality of first extrusion blocks 30 are sequentially provided on the circumference of the extrusion base 29. A first transmission block 31 is slidingly provided on the mounting seat 26 corresponding to the main board 24, and the first transmission block 31 pushes the main board 24 to swing based on the extrusion action of the first extrusion block 30.

[0042] Specifically, the extrusion base 29 rotates synchronously with the sprocket, and multiple first extrusion blocks 30 are arranged in sequence in the circumferential direction of the extrusion base 29. When the chain transmission mechanism drives the main board 24 to move, the extrusion base 29 drives multiple first extrusion blocks 30 to move circumferentially. When each main board 24 moves, its corresponding first transmission block 31 can be squeezed by one of the first extrusion blocks 30. The first transmission block 31 transmits the extrusion effect to the inner plate 241 of the main board 24, and the inner plate 241 drives the outer plate 240 to swing together until it reaches the starting position at the turning point of the first conveying branch chain 21. The distance that the first extrusion block 30 squeezes the first transmission block 31 reaches the maximum, and the deflection angle of the main board 24 reaches the maximum. The surface of the inner plate 241 is basically flush with the surface of the sub-plate 25 of the same group, which is for subsequent blocking of adjacent front and rear foods, and preventing the food from sliding under the action of gravity between the first conveying branch chain 21 and the limiting plate 23.

[0043] Furthermore, the sub-plate 25 includes two parts that are swingably arranged on the corresponding mounting seat 26, and at the swinging position, a third elastic member is provided between each part of the sub-plate 25 and the corresponding mounting seat 26, and each part of the sub-plate 25 swings based on the swinging action of the main plate 24.

[0044] Specifically, when food is laid on the first conveyor branch chain 21 for freezing, there is a situation where the food sticks to the main plate 24 and the sub-plate 25. When the food sticks to the main plate 24, the main plate 24 will swing and tilt, and the stuck food can be pushed. However, when the food sticks to the sub-plate 25, it is difficult to push and it is also difficult to turn the food over. Therefore, in this embodiment, the sub-plate 25 is divided into two parts that can swing on the corresponding mounting seats 26, and the swing of the main plate 24 is utilized to swing, that is, a second transmission block 33 and a second extrusion block 32 are slidably provided on the mounting seat 26 corresponding to the sub-plate 25, and the sliding direction of the second transmission block 33 is perpendicular to the sliding direction of the second extrusion block 32. The two second extrusion blocks 32 on the two adjacent mounting seats 26 in the same group abut against each other, that is, when one of them squeezes the corresponding second transmission block 33, the other also squeezes The corresponding second transmission block 33 is also provided with a pressure block 34 on the mounting seat 26 corresponding to the main board 24, and a third extrusion block 35 is provided on the internal plate 241. Along the swinging direction of the main board 24, the surface of the pressure block 34 has a wavy structure, that is, the third extrusion block 35 follows the swinging stroke of the internal plate 241, and intermittently squeezes the pressure block 34, and the pressure block 34 intermittently pushes the remaining second extrusion blocks 32 corresponding to the same group, and the second extrusion blocks 32 squeeze the corresponding second transmission block 33, so that the two parts of the auxiliary plate 25 intermittently swing, wherein the two parts of the auxiliary plate 25 can swing upward or downward from the horizontal position, that is, both ends of the swinging direction of each part of the auxiliary plate 25 can produce a pushing effect on the food, that is, during the swinging and tilting process of the main board 24, the two parts of the auxiliary plate 25 passively follow its swing and push the adhered food, so that the subsequent turning of the food is not affected.

[0045] Furthermore, the first extrusion block 30 is slidably arranged on the extrusion base 29, and in the sliding direction, a fourth elastic member is provided between the first extrusion block 30 and the extrusion base 29. Based on the elastic force of the fourth elastic member, the first extrusion block 30 tends to move away from the extrusion base 29; each end of the first extrusion block 30 connected to the fourth elastic member is provided with an extension portion 300, and a blocking portion 301 is provided at the position of the extrusion base 29 corresponding to each first extrusion block 30; each first extrusion block 30 includes two extrusion strokes when extruding the first transmission block 31: in the first stroke, before the extension portion 300 is blocked by the blocking portion 301, based on the elastic force of the fourth elastic member, the first extrusion block 30 produces elastic extrusion on the first transmission block 31; in the second stroke, the extension portion 300 is blocked by the blocking portion 301, and the first extrusion block 30 is forced to squeeze the first transmission block 31.

[0046] Specifically, the sliding direction of the first extrusion block 30 on the extrusion base 29 is parallel to the radial direction corresponding to its position. By utilizing the elastic force of the fourth elastic member, when the first extrusion block 30 is not subjected to an external force, the length of the portion thereof extending out of the extrusion base 29 is the longest. In the process of following the circumferential movement of the extrusion base 29, the first transmission block 31 can be squeezed earlier, causing the main plate 24 to swing. In this way, the two parts of the main plate 24 and the sub-plate 25 can use the swing to push the adhered food earlier, and a spring is provided at the end of the first extrusion block 30 connected to the fourth elastic member. The extension part 300 is provided with a blocking part 301 at the position of each first extrusion block 30 corresponding to the extrusion base 29, that is, when the extension part 300 is not in contact with the blocking part 301, the elastic extrusion effect is used to push the adhered food, which can prevent the food from being forced to be damaged. After the extension part 300 is in contact with the blocking part 301, the adhered food is forced to be pushed, that is, the elastic force is no longer sufficient to push the adhered food, but the freezing effect needs to continue, then forced pushing is used, even if the food is damaged, the damaged food can be picked out later.

[0047] The above descriptions of certain exemplary embodiments of the present invention are provided by way of illustration only. It is understood that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the present invention.

Claims

1. A tunnel-type quick-freezing device with a multi-layer conveyor belt, which is used for freezing food, comprises a refrigerator and a conveying mechanism, wherein the conveying mechanism is composed of a chain transmission mechanism and a plurality of supporting plates, and the plurality of supporting plates are arranged in sequence on the running track of the chain transmission mechanism, characterized in that: The conveying mechanism includes a conveying channel arranged on the quick-freezing tunnel, a first conveying branch chain and a second conveying branch chain are arranged between the conveying channels, and a limiting plate is provided at one end of the first conveying branch chain close to the second conveying branch chain; when the food is in the process of moving from the first conveying branch chain to the second conveying branch chain, the limiting plate cooperates with the first conveying branch chain to turn the food over.

2. The tunnel-type quick-freezing device with a multi-layer conveyor belt according to claim 1, characterized in that: The limit plate is slidably arranged on the conveying channel, and an adjusting bolt is provided between the limit plate and the conveying channel.

3. The tunnel-type quick-freezing device with a multi-layer conveyor belt according to claim 1, characterized in that: The several supporting plates on the first conveying branch chain are divided into several groups, each group includes a main plate and multiple sub-plates, and mounting seats are arranged at both ends of the main plate and the sub-plates, and the mounting seats are fixed to the chain transmission mechanism. Each main plate is swingably arranged on the corresponding two mounting seats, and a first elastic member is provided between the main plate and the corresponding mounting seat at the swinging position, and an extrusion member is installed on the sprocket rotating shaft of the first conveying branch chain close to the second conveying branch chain; the main plate swings based on the extrusion action of the extrusion member to prevent food from sliding off at the turning point of one end of the first conveying branch chain close to the second conveying branch chain.

4. The tunnel-type quick-freezing device with a multi-layer conveyor belt according to claim 3, characterized in that: The mounting seat is provided with a side stop portion for preventing food from contacting the chain transmission mechanism.

5. The tunnel-type quick-freezing device with a multi-layer conveyor belt according to claim 3, characterized in that: The main board is composed of an outer board and an inner board, and has a V-shaped structure as a whole; when not squeezed by the extrusion part, the outer board remains flush with the surface of the sub-board in the same group; when squeezed by the extrusion part, the inner board remains flush with the surface of the sub-board in the same group.

6. The tunnel-type quick-freezing device with multi-layer conveyor belts according to claim 5, characterized in that: A baffle is slidably provided on the conveying channel, and a second elastic member is provided between the baffle and the conveying channel in the sliding direction. When the main board is squeezed by the squeezing member, the baffle pushes the food on the main board away.

7. The tunnel-type quick-freezing device with a multi-layer conveyor belt according to claim 4, characterized in that: The extrusion member includes an extrusion base installed on the sprocket rotating shaft of the first conveying branch chain close to the second conveying branch chain. A plurality of first extrusion blocks are sequentially arranged in the circumferential direction of the extrusion base. A first transmission block is slidingly arranged on the mounting seat corresponding to the main board. The first transmission block drives the main board to swing based on the extrusion action of the first extrusion block.

8. The tunnel-type quick-freezing device with multi-layer conveyor belts according to claim 7, characterized in that: The sub-plate includes two parts that are swingably arranged on corresponding mounting seats, and at the swinging position, a third elastic member is provided between each part of the sub-plate and the corresponding mounting seat, and each part of the sub-plate swings based on the swinging action of the main plate.

9. The tunnel-type quick-freezing device with a multi-layer conveyor belt according to claim 8, characterized in that: The first extrusion block is slidably arranged on the extrusion base, and in the sliding direction, a fourth elastic member is provided between the first extrusion block and the extrusion base. Based on the elastic force of the fourth elastic member, the first extrusion block tends to move away from the extrusion base.

10. The tunnel-type quick-freezing device with multi-layer conveyor belts according to claim 9, characterized in that: An extension portion is provided at the end of each first extrusion block connected to the fourth elastic member, and a blocking portion is provided at a position of the extrusion base corresponding to each first extrusion block; Each first extrusion block includes two extrusion strokes when extruding the first transmission block: In the first stroke, before the extending portion is blocked by the blocking portion, the first extrusion block elastically squeezes the first transmission block based on the elastic force of the fourth elastic member; In the second stroke, the extending portion is blocked by the blocking portion, and the first extrusion block is forced to squeeze the first transmission block.

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