Turning mechanism and corresponding quick freezing machine

Abstract

This divisional application provides a flipping mechanism and a corresponding quick-freezing machine. The quick-freezing machine includes a transmission conveying device, which includes multiple conveying mechanisms, a driving mechanism, a baffle, and a flipping mechanism. The conveying mechanism is used to convey food into the machine body and reciprocate within the machine body; the driving mechanism is used to drive the conveying mechanism to rotate and convey; the baffle is arranged between the conveying mechanisms and is located on one side of the conveying end of the conveying mechanism to allow food to enter the next conveying mechanism; the flipping mechanism is arranged between the conveying mechanism and the baffle, and is used to flip the food conveyed by the conveying mechanism and transfer it to the baffle; the multiple conveying mechanisms are arranged in a stacked and spaced manner, and the transmission directions of adjacent conveying mechanisms are opposite. The present invention reduces the occupied space by arranging multiple conveying mechanisms in a stacked and reciprocating manner, while allowing food to be transferred and conveyed between the conveying mechanisms, avoiding the problem of food sticking and being easily damaged.

Description

[0001] This application is a divisional application. The application number of the original application is: "201710801327.2", the application date is: "September 7, 2017", and the name of the invention is: "Flip-type quick-freezing machine". Technical Field

[0002] The present invention relates to the field of quick freezers, in particular to a turnover mechanism and a corresponding quick freezer. Background Art

[0003] With the increasing demand for quick-frozen foods in the market, quick-freezing machines used to freeze quick-frozen foods are also developing rapidly.

[0004] There are many types of quick freezers available, and the main refrigeration methods include mechanical compressor refrigeration devices (tunnel-type quick freezers, plate quick freezers, single / double spiral quick freezers, immersion quick freezers) and liquid nitrogen quick freezing devices (tunnel-type liquid nitrogen quick freezers, spiral liquid nitrogen quick freezers, liquid nitrogen immersion quick freezers).

[0005] Some quick-freezing machines use multiple conveying mechanisms in a stacked and spaced arrangement, which are connected in a zigzag manner to convey food, thereby reducing the space occupied. However, there is a lack of transfer and flipping mechanisms between the multiple conveying mechanisms. The food is frozen unevenly during transportation, is prone to adhesion, and is easily damaged in shape and structure due to falling during transportation, making it impossible to transport the food intact.

[0006] Therefore, it is necessary to provide a turning mechanism and a corresponding quick-freezing machine to solve the problems existing in the prior art. Summary of the Invention

[0007] The present invention provides a turnover mechanism and a corresponding quick-freezing machine, which solves the technical problem that the existing quick-freezing machine lacks a transfer and turnover mechanism, so that food cannot be transported intact.

[0008] The present invention provides a turning mechanism, which is arranged between a conveying mechanism and a baffle, and is used to turn over the food conveyed by the conveying mechanism and transfer it to the baffle or the conveying head end of the next conveying mechanism;

[0009] The turning mechanism includes a turner for receiving and turning the food and unloading the food to the next conveying mechanism and a motor for driving the turner to rotate. The rotation direction of the turner is consistent with the rotation direction of the driving shaft of the conveying mechanism.

[0010] The flipper comprises:

[0011] The cylindrical turning device body is rotatably connected to the motor via a rotating shaft;

[0012] Side plates are provided at both ends of the turner body;

[0013] A plurality of bearing plates are evenly arranged on the circumferential surface of the flipper body around the axis of the flipper body;

[0014] A loading and unloading slot is defined between the side plates, the turner body and the adjacent carrying plates.

[0015] In the present invention, the loading and unloading chute has a loading state for receiving food, a flipping state for flipping the received food, and an unloading state for unloading the flipped food during rotation.

[0016] When the loading and unloading groove is in a load-bearing state, the notch of the loading and unloading groove faces the conveying mechanism; when the loading and unloading groove is in a flipping state, the notch of the loading and unloading groove faces upward, and the bottom height of the loading and unloading groove is lower than the conveying plane of the conveying mechanism; when the loading and unloading groove is in an unloading state, the notch of the loading and unloading groove faces the baffle.

[0017] The supporting plate includes a fixing portion fixedly connected to the flipper body, a supporting portion extending from the fixing portion toward the outside of the flipper body, and a guide hook portion provided at a free end of the supporting portion, wherein the guide hook portion is warped from the free end of the supporting portion;

[0018] The fixing parts are connected to each other and cover the circumferential surface of the flipper body, and the fixing parts include a first connecting surface and a second connecting surface; the bearing part includes a receiving surface connected to the first connecting surface and an unloading surface connected to the second connecting surface and located on the back of the receiving surface; the guide hook part includes an introduction surface connected to the receiving surface and an exit surface connected to the unloading surface, the introduction surface is an arc surface and warps toward the outside of the notch of the loading and unloading groove;

[0019] The introduction surface and the receiving surface form a bearing surface, the second connecting surface, the unloading surface and the leading-out surface form a sliding surface, and the bearing surface, the first connecting surface and the sliding surface of the previous bearing plate constitute the loading and unloading groove.

[0020] Furthermore, the supporting plates have five pieces, the angle between the first connecting surface and the supporting surface is greater than or equal to 90°, the second connecting surface and the unloading surface are in the same plane, and the angle between the first connecting surface and the sliding surface is an obtuse angle.

[0021] Furthermore, the bearing surface is a flexible surface, and the sliding surface is a smooth surface.

[0022] The present invention also includes a quick freezer, comprising the above-mentioned turning mechanism, wherein the conveying mechanism is driven by a driving mechanism to rotate and convey, a plurality of the conveying mechanisms are arranged in a stacked manner, and the conveying directions of adjacent conveying mechanisms are opposite, and the baffle is arranged between the conveying mechanisms and is located on one side of the conveying end of the conveying mechanism;

[0023] The quick-freezing machine further comprises a body and a refrigeration device, wherein the body comprises a freezing chamber for quick-freezing food, a drive installation chamber independently arranged on one side of the freezing chamber, and an electric control chamber independently arranged on the other side of the freezing chamber;

[0024] The conveying mechanism is arranged in the freezing chamber, the reduction motor of the driving mechanism is installed in the driving installation chamber, and the rotating shaft of the reduction motor penetrates the freezing chamber and is connected to the driving shaft through a coupling;

[0025] The refrigeration device includes a cold air delivery main pipe arranged in the electric control room, a control valve arranged on the cold air delivery main pipe, cold air delivery branches arranged on both sides of the inner wall of the freezing chamber and connected to the cold air delivery main pipe, and a nozzle arranged on the cold air delivery branch pipe.

[0026] The quick freezer further comprises a cold air circulation device for forcibly circulating cold air in the freezing chamber, the cold air circulation device comprising a fan fixedly arranged between the cold air delivery branch pipes, a motor arranged in the electric control chamber for driving the fan to rotate, and a guide plate sleeved on the fan;

[0027] The guide plate is provided with an opening, the fan is arranged in the opening, and a space for ventilation is provided between the guide plate and the inner wall of the body;

[0028] The air outlet direction of the fan faces the inner wall of the machine body, and air outlets are arranged on all four sides of the guide plate.

[0029] In the present invention, the conveying mechanism is arranged on a conveying frame, and rollers are arranged at the four corners of the bottom of the conveying frame;

[0030] One side of the machine body is provided with a sealed door for facilitating the conveyor frame to enter or exit the machine body, and a guide rail provided on the bottom surface of the machine body for rolling connection with the roller; the quick freezer further includes a limit assembly for limiting the rolling of the roller;

[0031] The roller comprises a roller body and a groove ring recessed on the circumferential surface of the roller body and used for rolling engagement with the guide rail;

[0032] The rollers include a front roller away from the sealing door and a rear roller close to the sealing door; the limiting assembly includes a first limiting assembly provided at the end of the guide rail for limiting the front roller;

[0033] The first limiting assembly includes a support portion fixedly connected to the body, an abutment portion extending from a free end of the support portion and forming a matching groove ring, a clamping portion cooperating with the abutment portion for clamping the front roller, a detour portion connected between the abutment portion and the clamping portion, and a guide portion formed at the free end of the clamping portion;

[0034] The detour portion is in an inverted U-shape and has a restoring force for elastic deformation. The abutment portion, the detour portion and the clamping portion constitute an elastic clamping structure. The guide portion is in a V-shape to guide the front roller into or out of the range of the elastic clamping structure.

[0035] When the first limiting assembly limits the front roller, the detour portion is in an elastically stretched state, and the abutting portion and the clamping portion are tightly fastened to the groove ring to limit the front roller;

[0036] One end of the guide rail close to the first limiting assembly is in a downward sliding shape; when the first limiting assembly limits the front roller, the front roller has a downward sliding trend and abuts against the support portion.

[0037] Furthermore, the limiting assembly further includes a second limiting assembly provided at the starting end of the guide rail for limiting the rear roller, the second limiting assembly including a matching piece fixedly provided on one side of the guide rail and a fastening piece provided on the other side of the guide rail and opposite to the matching piece;

[0038] The convex end surface of the fastening member facing one end of the mating member is composed of an introduction slope for introducing the rear roller into the machine body, an outlet slope for leading the rear roller out of the machine body, and a fastening plane connected to the introduction slope and the outlet slope.

[0039] The distance from the tightening plane to the matching piece is smaller than the width of the rear roller, so as to limit the rear roller from passing through the tightening plane. The distances from the leading-in slope and the leading-out slope to the matching piece gradually increase from the inside to the outside.

[0040] The included angle between the leading-out inclined surface and the tight plane is smaller than the included angle between the leading-in inclined surface and the tight plane, and the vertical distance between the two ends of the leading-out inclined surface is larger than the vertical distance between the two ends of the leading-in inclined surface.

[0041] Furthermore, one end of the fastening member having the convex end surface is hollowed out to form a plurality of through holes, wherein the density of the through holes on the side close to the inlet bevel is greater than the density of the through holes on the side close to the outlet bevel.

[0042] Compared with the quick-freezing machine of the prior art, the quick-freezing machine of the present invention has the following beneficial effects:

[0043] The quick freezer of the present invention uses a stacked reciprocating arrangement of multiple conveying mechanisms, which reduces the space occupied while allowing food to be transferred between the conveying mechanisms, thereby preventing food from sticking together. At the same time, granular food rolls and flips when being transferred from one conveying mechanism to the next, further preventing food from sticking together.

[0044] By setting up multiple conveying troughs to freeze different types of food, different types of food can be quickly frozen at the same time, thereby improving freezing efficiency;

[0045] By setting up the flipping mechanism, the food is flipped between the two conveying mechanisms and transferred to the next conveying mechanism. After multiple flipping, the food is evenly frozen during transportation, which improves the freezing efficiency and avoids food adhesion. In addition, the setting of the flipping mechanism performs a secondary conduction effect on the food in height, preventing the food from falling directly from the previous conveying mechanism to the next conveying mechanism and damaging the food.

[0046] The setting of the limiting component limits the conveying frame, thereby improving the stability of the conveying mechanism in conveying work; and the setting of the first limiting component limiting the front roller and the second limiting component limiting the rear roller further improves the stability of the conveying mechanism; during the operation of the transmission conveying device, vibrations are continuously generated to cause the roller to roll, wherein the setting of the first limiting component and the lowering section of the guide rail increases the difficulty of the roller to retreat, improves the stability of the roller, and avoids the situation where the roller retreats; the setting of the second limiting component further increases the difficulty of the roller to retreat, thereby improving the stability of the roller;

[0047] By setting up the cold air circulation device, the cold air circulation in the freezer is strengthened, and the freezing efficiency of the cold air on the food is improved.

[0048] The invention solves the technical problems of the prior art quick freezer, such as large space occupation, easy food adhesion and low freezing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic side cross-sectional view of a preferred embodiment of the quick-freezing machine of the present invention;

[0050] Figure 2 It is a front cross-sectional structural schematic diagram of a preferred embodiment of the quick-freezing machine of the present invention;

[0051] Figure 3 Schematic diagram of the structure of the conveying mechanism of the preferred embodiment of the quick-freezing machine of the present invention;

[0052] Figure 4 for Figure 1 A magnified view of middle A;

[0053] Figure 5 for Figure 4 Schematic diagram of the structure of the flipper in FIG;

[0054] Figure 6 Schematic diagram of the coordination structure of the first limiting assembly and the front roller of a preferred embodiment of the quick-freezing machine of the present invention;

[0055] Figure 7 for Figure 2 Enlarged view of middle B;

[0056] Figure 8 Schematic top view of the cooperation structure of the second limiting assembly and the rear roller of the preferred embodiment of the quick-freezing machine of the present invention;

[0057] Figure 9 Schematic diagram of the structure of the quick-freezing machine of the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0058] Please refer to the drawings, in which the same component symbols represent the same components. The principles of the present invention are illustrated by implementing them in an appropriate computing environment. The following description is based on the specific embodiments of the present invention illustrated, and should not be construed as limiting the present invention to other specific embodiments not described in detail herein.

[0059] There are many types of quick freezers available, and the main refrigeration methods include mechanical compressor refrigeration devices (tunnel-type quick freezers, plate quick freezers, single / double spiral quick freezers, immersion quick freezers) and liquid nitrogen quick freezing devices (tunnel-type liquid nitrogen quick freezers, spiral liquid nitrogen quick freezers, liquid nitrogen immersion quick freezers).

[0060] However, mechanical compressor refrigeration devices have disadvantages such as slow quick freezing efficiency, large equipment footprint, small production capacity, and high food dry loss. Although liquid nitrogen quick freezing machines are widely used due to their fast quick freezing efficiency, low food dry loss, and small footprint, quick-frozen foods are prone to sticking together, and the bottom of the product cools down and freezes slowly.

[0061] At the same time, some quick-freezing machines use multiple conveying mechanisms in a stacked and spaced arrangement, which are connected in a zigzag manner to convey food, thereby reducing the space occupied. However, there is a lack of transfer and flipping mechanisms between the multiple conveying mechanisms. The food is frozen unevenly during transportation, is prone to adhesion, and is easily damaged in shape and structure due to falling during transfer, making it impossible to transport the food intact.

[0062] Please refer to Figure 1 and Figure 2 , Figure 1 Schematic side cross-sectional view of a preferred embodiment of the quick-freezing machine of the present invention; Figure 2 This is a front cross-sectional view of a preferred embodiment of the quick-freezing machine of the present invention. The quick-freezing machine of the present invention comprises a machine body, a transmission and conveying device disposed within the machine body, a refrigeration device, a cold air circulation device, and an electronic control system. The electronic control system is used to control the operation of the transmission and quick-freezing device, the refrigeration device, and the cold air circulation device.

[0063] In this embodiment, please refer to Figure 9 The machine body includes three independent chambers: a freezing chamber 11 for freezing food, a drive installation chamber 12 located on one side of the freezing chamber 11, and an electric control chamber 13 located on the other side of the freezing chamber 11. The machine body 10 can be made of 304 stainless steel and adopts a polyurethane integral foaming process, which has good thermal insulation effect.

[0064] The transmission conveying device includes a conveying mechanism 21, a drive mechanism 22 for driving the conveying mechanism 21 to rotate and convey, a baffle 23, a flip mechanism, and a conveying frame 25 for fixing the conveying mechanism 21, the baffle 23, and the flip mechanism. The conveying mechanism 21, the baffle 23, the flip mechanism, and the conveying mechanism 25 are arranged in the freezer compartment 11, and the drive mechanism 22 is arranged in the drive installation chamber 12. The shaft of the reduction motor in the drive mechanism 22 penetrates the freezer compartment 11 and is connected to the driving shaft 212 of the conveying mechanism 21 via a coupling 221.

[0065] The refrigeration system includes a cold air delivery main pipe 31, a control valve 32, a cold air delivery branch pipe 33 connected to the cold air delivery main pipe 31, and a nozzle mounted on the cold air delivery branch pipe 33. The cold air delivery main pipe 31 and the control valve 32 are located in the electrical control room 13, while the cold air delivery branch pipe 33 and the nozzle are located in the freezer compartment 11. The cold air delivery main pipe 31 penetrates the freezer compartment 11 and connects to the cold air delivery branch pipe 33. The refrigerated gas delivered by the refrigeration system can be liquid nitrogen, carbon dioxide, or other substances.

[0066] The cold air circulation device includes a fan 41, a motor 42 that drives the fan 41, and a deflector 43 that guides the air discharged by the fan 41. The fan 41 and deflector 43 are arranged in the freezer compartment 11, and the motor 42 is arranged in the electrical control room 13. The shaft of the motor 42 extends into the freezer compartment 11 and is rotatably connected to the fan 41.

[0067] The electrical control system includes an electrical cabinet, a temperature sensor for sensing the temperature in the freezer compartment 11, a touch screen, a PLC (Programmable Logic Controller), a frequency converter, and an emergency stop switch. The temperature sensor is located in the freezer compartment 11, and the electrical cabinet, touch screen, PLC, frequency converter, and emergency stop switch are located in the electrical control room 13.

[0068] Multiple conveying mechanisms 21 are used to convey food into the body 10 and reciprocate within the body 10 while being frozen; a driving mechanism 22 is used to drive the conveying mechanism 21 to rotate and convey; a baffle 23 is provided between the conveying mechanisms 21 and is located on one side of the conveying end of the conveying mechanism 21 to allow food to enter the next conveying mechanism 21; a flipping mechanism is provided between the conveying mechanism 21 and the baffle 23, and is used to flip the food conveyed by the conveying mechanism 21 and transfer it to the baffle 23 or the conveying head end of the next conveying mechanism 21;

[0069] The plurality of conveying mechanisms 21 are arranged in a stacked manner and spaced apart, and the conveying directions of adjacent conveying mechanisms 21 are opposite.

[0070] In this embodiment, multiple conveying mechanisms 21 are arranged in a stacked and spaced manner, which reduces the space occupied by this embodiment. In addition, when food is transferred from one conveying mechanism 21 to the next conveying mechanism 21, the food is separated from the conveying mechanism 21 during the transfer process, thereby preventing the food from being constantly on the conveying mechanism 21, thereby preventing the food from sticking to the conveying mechanism 21 and to each other.

[0071] In addition, the setting of the flipping mechanism not only plays the role of flipping the food, but also plays a role of secondary conduction; flipping the food can, on the one hand, avoid the adhesion of the food, and on the other hand, allow the food to be evenly frozen, thereby improving the freezing efficiency of the food; as for the secondary conduction effect, since the food will become very hard during the freezing process, it prevents the food from falling directly from the previous conveying mechanism 21 to the next conveying mechanism 21, causing damage to the food and damaging the quality of the food, and the flipping mechanism plays a buffering role.

[0072] Please refer to Figure 2 and Figure 3 In this embodiment, the conveying mechanism 21 includes a mesh belt 211 , a driving shaft 212 , a driven shaft 213 and a transmission gear 214 .

[0073] The mesh belt 211 is used to transport food; a driving shaft 212 is provided at one end of the mesh belt 211; a driven shaft 213 is provided at the other end of the mesh belt 211, and the driven shaft 213 cooperates with the driving shaft 212 to drive the mesh belt 211 to rotate and transport; a transmission gear 214 is fixedly provided at the end of the driving shaft 212 facing away from the mesh belt 211;

[0074] A driving shaft 212 of a conveying mechanism 21 with the same conveying direction is connected to a drive mechanism 22 via a coupling 215. The driving shafts 212 of the conveying mechanisms 21 with the same conveying direction are rotatably connected via a chain 216. The drive mechanism includes two reduction motors, each of which drives a conveying mechanism 21 with opposite conveying directions.

[0075] In this embodiment, the conveying mechanism 21 is divided into a first conveying mechanism and a second conveying mechanism, and the conveying directions of the two conveying mechanisms are opposite. A plurality of first conveying mechanisms constitute a first conveying combination, and a plurality of second conveying mechanisms constitute a second conveying combination. A reduction motor drives a first conveying mechanism in the first conveying combination, so that the first conveying mechanism drives the adjacent first conveying mechanism in the same group, thereby causing the first conveying mechanisms in the same group to operate together. Similarly, another reduction motor drives a second conveying combination in the second conveying combination, and then the second conveying mechanism drives the adjacent second conveying mechanism in the same group, thereby causing the second conveying mechanisms in the same group to operate together.

[0076] The adjacent conveying mechanisms 21 in the same group are connected in rotation via a transmission connection method of a transmission gear 214 and a chain 216 , and the rotating shaft of the reduction motor is connected to the driving shaft 212 via a coupling 215 .

[0077] Moreover, in this embodiment, the conveying mechanisms 21 are an odd number. This arrangement allows food to enter from one end of the machine body 10 and exit from the other end, avoiding the situation where food enters and exits at the same time and is easily mixed up. The optional first conveying mechanisms include five and the second conveying mechanisms include four. Of course, the conveying mechanisms 21 can also be an even number.

[0078] In addition, the mesh belt 211 includes a mesh belt body 2111 that rotates around a driving shaft 212 and a driven shaft 213, and a plurality of raised rings 2112 that are protruded from the mesh belt body 2111 and extend around the conveying track of the mesh belt body 2111. Adjacent raised rings 2112 and the mesh belt body 2111 define a conveying trough 2113 for conveying food to convey different types of food. For example, according to the type of food, it can be seafood, meat, vegetable, different types of seafood, different types of meat, and different types of vegetables, etc.; according to the shape of the food, it can be granular food and non-granular food, etc.

[0079] The provision of multiple conveying troughs 2113 serves to isolate different types of food, so that this embodiment can prevent different types of food from being mixed up while freezing different foods.

[0080] Specifically, there are three raised rings 2112, forming two conveying grooves 2113, which are respectively a first conveying groove for conveying granular food and a second conveying groove for conveying non-granular food;

[0081] A plurality of convex hemispherical blocks 2114 are convexly provided at the bottom of the first conveying trough. The blocks 2114 are evenly arranged in an array, and the blocks 2114 in adjacent rows are staggered.

[0082] Of course, in the present invention, the number of raised rings 2112 is not limited to three and can be more than three, such as four or five. The provision of the convex hemispherical stopper 2114 in the first conveyor trough serves to prevent the granular food from rolling. As the granular food is transferred from one conveyor mechanism 21 to the next, it rolls on the mesh belt 211 of the next conveyor mechanism 21 under the flipping mechanism and the guidance of the guide plate 23. The provision of the stopper 2114 is intended to prevent the granular food from rolling, allowing the granular food to enter the next conveyor mechanism in an orderly manner, thereby preventing uneven food distribution due to rolling.

[0083] Please refer to Figure 4 and Figure 5 In this embodiment, the turning mechanism includes a turner 24 for receiving and turning the food and unloading the food to the next conveying mechanism 21 and a motor for driving the turner 24 to rotate. The rotation direction of the turner 24 is consistent with the rotation direction of the driving shaft 212.

[0084] The flipper 24 comprises a cylindrical flipper body 241, side plates 242, and a supporting plate 243. The cylindrical flipper body 241 is rotatably connected to a motor via a rotating shaft; the side plates 242 are disposed at both ends of the flipper body 241; and a plurality of supporting plates 243 are evenly arranged on the circumference of the flipper body 241 around its axis. A loading and unloading slot 244 is defined between the side plates 242, the flipper body 241, and adjacent supporting plates 243.

[0085] The loading and unloading chute 244 has a loading state for receiving food, a flipping state for flipping the received food, and an unloading state for unloading the flipped food during rotation.

[0086] When the loading and unloading groove 244 is in the flipped state, the bottom surface of the loading and unloading groove 244 is lower than the conveying plane of the conveying mechanism 21 .

[0087] In this embodiment, when the loading and unloading slot 244 is in the loading state, the slot opening of the loading and unloading slot 244 faces the conveying mechanism 21. When the loading and unloading slot 244 is in the flipping state, the slot opening of the loading and unloading slot 244 faces upward. When the loading and unloading slot 244 is in the unloading state, the slot opening of the loading and unloading slot 244 faces the baffle 23. The loading and unloading slot 244 switches between states by rotating the flipper body 241 through a predetermined angle. In this embodiment, there are five load plates 243, so the loading and unloading slot 244 can be switched from the loading state to the flipping state by rotating 72°, and from the flipping state to the unloading state by rotating 72°.

[0088] When the loading and unloading groove 244 is in the flipped state, the bottom surface of the loading and unloading groove 244 is at the highest height. In this embodiment, the bottom surface of the loading and unloading groove 244 is the first connecting surface 243a.

[0089] This arrangement ensures that when the turner 24 is in the unloading state, the height of the food is lower than the conveying plane of the conveying mechanism 21, which plays a role in buffering the falling height of the food to prevent the food from falling directly from the conveying plane of the conveying mechanism 21 to the next conveying mechanism 21 and damaging the food.

[0090] In this embodiment, the supporting plate 243 includes a fixing portion 2431 fixedly connected to the flipper body 241, a supporting portion 2432 extending from the fixing portion 2431 toward the outside of the flipper body 241, and a guide hook portion 2433 provided at the free end of the supporting portion 2432. The guide hook portion 2433 is formed by warping the free end of the supporting portion 2432.

[0091] The fixing portions 2431 are connected to each other and cover the circumference of the flipper body 241. The fixing portions 2431 include a first connecting surface 243a and a second connecting surface 243b. The carrying portion 2432 includes a receiving surface 243c connected to the first connecting surface 243a and an unloading surface 243d connected to the second connecting surface 243b and located behind the receiving surface 243c. The guide hook portion 2433 includes an introduction surface 243e connected to the receiving surface 243c and an exit surface 243f connected to the unloading surface 243d.

[0092] Among them, the introduction surface 243e and the receiving surface 243c of the supporting plate 243 form a supporting surface 243g, the second connecting surface 243b, the unloading surface 243d and the leading-out surface 243f form a sliding surface 243h, and the supporting surface 243g, the first connecting surface 243a and the sliding surface 243h of the previous supporting plate 243 constitute a loading and unloading groove 244.

[0093] In this embodiment, the introduction surface 243e of the guide hook portion 2433 is an arcuate surface that curves toward the outside of the slot opening of the loading and unloading groove 244. When the loading and unloading groove 244 is in a loaded state, the introduction surface 243e serves to guide food into the loading and unloading groove 244 while also preventing the food from slipping out of the loading and unloading groove 244. The exit surface 243f of the guide hook portion 2433 is curved in the same direction as the introduction surface 243e. When the loading and unloading groove 244 is in an unloading state, the exit surface 243f serves to smoothly guide the food out of the loading and unloading groove 244, preventing the food from falling and injuring itself, while also accelerating the food from slipping out of the loading and unloading groove 244, thereby improving delivery efficiency.

[0094] In addition, the arrangement of the fixing portions 2431 covering the entire circumferential surface of the flipper body 241 increases the connection area between the supporting plate 243 and the flipper body 241 , thereby improving the stability of the fixed connection between the two.

[0095] Furthermore, the supporting plate 243 has five pieces, the angle between the first connecting surface 243a and the supporting surface 243g is greater than or equal to 90°, the second connecting surface 243b and the unloading surface 243d are in the same plane, and the angle between the first connecting surface 243a and the sliding surface 223g is an obtuse angle.

[0096] It is obvious that the more the number of supporting plates 243 is, the smaller the accommodating space of the loading and unloading grooves 244 is; the smaller the number of supporting plates 243 is, the greater the angle of rotation required for the state transition between the loading and unloading grooves 244 is. If the conveying speed of the conveying mechanism 21 remains unchanged, the loading and unloading grooves 244 need to increase the rotation speed to cooperate with the conveying mechanism 21. Once the rotation speed of the loading and unloading grooves 244 is too fast, the food will be thrown out and damaged.

[0097] Therefore, in this embodiment, five supporting plates 243 are selected so that the loading and unloading slots 244 have a relatively suitable accommodation space and a suitable rotation speed. Of course, the number of supporting plates 243 is not limited to this, and can also be greater than five or less than five.

[0098] Setting the angle between the first connecting surface 243a and the supporting surface 243g to be greater than or equal to 90° avoids the situation where the angle between the two is acute. When the angle is acute, on the one hand, the space at the acute angle is essentially unusable for accommodating food, and on the other hand, the space at the acute angle is prone to residue during the low-temperature freezing process, which may contaminate other food. Therefore, setting the angle to be greater than or equal to 90° can improve the cleanliness of the loading and unloading groove 244. Preferably, the angle is 90°. This 90° angle not only improves the cleanliness of the loading and unloading groove 244 but also ensures that the loading and unloading groove 244 has the maximum available space for accommodating food.

[0099] The second connecting surface 243b and the unloading surface 243d are on the same plane in order to improve the flatness of the sliding surface 223g so that the food can be unloaded smoothly and quickly; and the angle between the first connecting surface 243a and the sliding surface 223g is set to be an obtuse angle. When the loading and unloading groove 244 is in the unloading state, the first connecting surface 243a and the sliding surface 223g form a stepped smoothly transitioned inclined surface, so that the food can quickly break away from the first connecting surface 243a and slide more smoothly on the sliding surface 223g, thereby avoiding the food sliding too fast and hitting the baffle 23 or the next conveying mechanism 21 and damaging the food.

[0100] Furthermore, the load-bearing surface 243g is a flexible surface, and the lower sliding surface 243h is a smooth surface. When the loading and unloading chute 244 is in a load-bearing state, the load-bearing surface 243g needs to receive food. When the food falls from the conveying mechanism 21 onto the load-bearing surface 243g, the food and the load-bearing surface 243g collide. The provision of the flexible load-bearing surface 243g can cushion the impact of the food on the load-bearing surface 243g, thus preventing damage to the food. Of course, a flexible layer can also be formed on the load-bearing surface 223 to cushion the impact of the food on the load-bearing surface 243g.

[0101] When the loading and unloading chute 244 is in the unloading state, the lower sliding surface 243h serves as a guide for the downward movement of the food, so the smooth lower sliding surface 243h facilitates the downward movement of the food.

[0102] In addition, the motor of the turning mechanism is arranged in the driving installation chamber 12 , and the motor is connected to the turning device body 241 of the turning device 24 via a rotating shaft.

[0103] Please refer to Figure 1 and Figure 6 In this embodiment, the transmission conveying device further includes a conveying frame 25 provided with a conveying mechanism 21 and rollers provided at the four corners of the bottom of the conveying frame 25; one side of the body 10 is provided with a sealed door 14 for facilitating the conveying frame 25 to enter or exit the body 10, and a guide rail 15 provided on the bottom surface of the body 10 for rolling connection with the rollers; the quick freezer further includes a limit assembly for limiting the rolling of the rollers;

[0104] The roller includes a roller body and a groove ring recessed on the circumference of the roller body and used for rolling engagement with the guide rail 15;

[0105] The rollers include a front roller 261 away from the sealing door 14 and a rear roller 262 close to the sealing door 14; the limiting assembly includes a first limiting assembly 31 provided at the end of the guide rail 15 for limiting the front roller 261;

[0106] The first limiting assembly 31 includes a supporting portion 311 fixedly connected to the body 10, an abutting portion 312 extending from the free end of the supporting portion 311 and forming a matching groove ring, a clamping portion 313 cooperating with the abutting portion 312 to clamp the front roller 261, a detour portion 314 connected between the abutting portion 312 and the clamping portion 313, and a guide portion 315 formed at the free end of the clamping portion 313.

[0107] The detour portion 314 is in an inverted U-shape and has elastic restoring force. The abutment portion 312, the detour portion 314, and the clamping portion 313 form an elastic clamping structure. The guide portion 315 is V-shaped to guide the front roller 261 into or out of the range of the elastic clamping structure.

[0108] When the first limiting assembly 31 limits the front roller 261 , the detour portion 314 is in an elastically stretched state, and the abutting portion 312 and the clamping portion 313 are tightly engaged with the groove ring to limit the front roller 261 .

[0109] Specifically, when the first limiting component 31 limits the front roller 261, the detour portion 314 is stretched by the front roller 261, so that the detour portion 314 is in a stretched state. At this time, the detour portion 314 is stretched and has a contraction elastic force. Under the action of this elastic force, the clamping portion 313 tightly clamps the front roller 261 to limit the front roller.

[0110] In addition, one end of the guide rail 15 close to the first limiting assembly 31 is in a downward sliding shape; when the first limiting assembly 31 limits the front roller 261 , the front roller 261 has a downward trend and abuts against the support portion 311 .

[0111] Specifically, the downwardly descending section of the guide rail 15 is the downwardly descending section 151. When the first limiting assembly 31 limits the front roller 261, the front roller 261 is located on the downwardly descending end 151 and abuts against the supporting portion 311. This arrangement allows the front roller 261 to be more closely attached to the abutting portion 312, and the center of gravity of the front roller 261 when descending is precisely abutted against the supporting portion 311. The strong supporting force of the supporting portion 311 stabilizes the downward movement of the front roller 261, ensuring that the front roller 261 has a downward tendency.

[0112] Because the front roller 261 is in a downward trend, the front roller 261 needs to move backward not only to overcome the clamping force of the first limiter 31, but also to overcome the static friction of the front roller 261 in the downward section 151. This further improves the stability of the front roller 261.

[0113] Please refer to Figure 7 and Figure 8 In this embodiment, the limiting assembly further includes a second limiting assembly 32 disposed at the starting end of the guide rail 15 for limiting the rear roller 262. The second limiting assembly 32 includes a matching member 321 fixedly disposed on one side of the guide rail 15 and a fastening member 322 disposed on the other side of the guide rail 15 and opposite to the matching member 321.

[0114] The convex end surface of the fastening member 322 facing the mating member 321 is composed of an introduction slope 322a for introducing the rear roller 262 into the body 10, an outlet slope 322b for guiding the rear roller 262 out of the body 10, and a fastening plane 322c connecting the introduction slope 322a and the outlet slope 322b.

[0115] The distance between the tightening plane 322c and the fitting member 321 is smaller than the width of the rear roller 262 to limit the rear roller 262 from passing through the tightening plane 322c. The distance between the leading-in inclined surface 322a and the leading-out inclined surface 322b and the fitting member 321 increases gradually from the inside to the outside.

[0116] The included angle between the leading-out inclined surface 322b and the closing plane 322c is smaller than the included angle between the leading-in inclined surface 322a and the closing plane 322c, and the vertical distance between the two ends of the leading-out inclined surface 322b is greater than the vertical distance between the two ends of the leading-in inclined surface 322a.

[0117] In this embodiment, the function of the fitting member 321 is to cooperate with the tightening member 322 to create an interference fit with the rear roller 262, thereby preventing the rear roller 262 from moving backward after passing the tightening surface 322c of the tightening member 322. The tightening member 322 also supports the rear roller 262.

[0118] The distances between the lead-in slope 322a and the lead-out slope 322b and the mating member 321 are gradually increased from the inside to the outside, forming a lead-in area between the lead-in slope 322a and the mating member 321, and a lead-out area between the lead-out slope 322b and the mating member 321. The distance between the tightening plane 322c and the mating member 321 is smaller than the width of the rear roller 262, forming an interference fit area between the tightening plane 322c and the mating member 321.

[0119] Therefore, under the action of external force, the rear roller 262 enters the lead-in area and, under continued external force, enters the interference fit area. Finally, it passes through the interference fit area and contacts the lead-out inclined surface 322b and the mating piece 321 in the lead-out area, thereby limiting the backward movement of the rear roller 262 and improving the stability of the rear roller 262, thereby improving the stability of the transmission conveyor device. Optionally, the width of the front roller 261 is less than or equal to the distance from the tight surface 322c to the mating piece 321, which facilitates the front roller 261 to smoothly pass through the interference fit area.

[0120] Furthermore, the angle between the lead-out bevel 322b and the tightening plane 322c is smaller than the angle between the lead-in bevel 322a and the tightening plane 322c, and the vertical distance between the ends of the lead-out bevel 322b is greater than the vertical distance between the ends of the lead-in bevel 322a. Therefore, the opening of the lead-out region is longer and narrower than the opening of the lead-out region. Furthermore, within the lead-out region, the area where the distance from the lead-out bevel 322b to the mating member 321 is less than the width of the rear roller 262 is deeper than the lead-in region. In other words, the interference fit area within the lead-out region is longer than the interference fit area within the lead-in region.

[0121] Therefore, it is much more difficult for the rear roller 262 to enter the interference fit area from the lead-out area than from the lead-in area.

[0122] The rear roller 262 enters the interference fit area from the lead-out area. Since the interference fit area of the lead-out area is longer, the rear roller 262 needs a longer period of continuous external force to overcome the resistance of the interference fit area.

[0123] When the transmission conveying device is running, the conveying mechanism 21 will rotate at the same time, thereby driving the entire conveying mechanism 25 to generate continuous vibration, and the vibration will cause the front and rear rollers (261, 262) to roll along the guide rail 15, so that the rear roller 262 will hit the fastening member 322, causing the rear roller 262 to enter the interference fit area from the lead-out area, or even pass through the interference fit area, thereby causing instability in the operation of this embodiment.

[0124] Because vibration is a frequency-dependent force and cannot be a continuous force, the rear roller 262 needs to be continuously applied for a long time to pass through the interference fit area of the lead-out area. Therefore, the rear roller 262 is confined to the lead-out area, thereby improving its stability. For example, under a force of 10 Newtons, the rear roller 262 needs to pass through the interference fit area of the lead-out area in 3 seconds. However, the 10 Newton force generated by vibration can only be maintained for 2 seconds. As a result, the force generated by vibration will cause the rear roller 262 to advance a short distance and cannot pass through the interference fit area. When the force generated by vibration stops, the interference fit area will react on the rear roller 262, pushing it back.

[0125] Therefore, the included angle between the lead-out slope 322b and the closing plane 322c is smaller than the included angle between the lead-in slope 322a and the closing plane 322c, and the vertical distance between the two ends of the lead-out slope 322b is larger than the vertical distance between the two ends of the lead-in slope 322a, making it easy for the rear roller 262 to enter but difficult to come out.

[0126] Furthermore, one end of the fastening member 322 having a convex end surface is hollowed out to form a plurality of through holes 3221 , wherein the density of the through holes 3221 close to the inlet slope 322a is greater than the density of the through holes 3221 close to the outlet slope 322b .

[0127] The purpose of the through-holes 3221 is to reduce the rigidity of the fastening member 322, allowing the convex end surface to have greater deformability. The more through-holes 3221 there are, the better the deformability. Therefore, the side of the fastening member 322 near the lead-in slope 322a has greater deformability than the side near the lead-out slope 322b. This makes it easier for the rear roller 262 to move from the lead-in area into the interference fit area, while it is more laborious for the rear roller 262 to move from the lead-in area into the interference fit area.

[0128] Based on the above structure, the second limiting assembly 32 also includes a driving unit for driving the fastening piece 322 to slide. The driving unit includes a slide rail 323 that is slidably connected to the fastening piece 322, a fixed block 324 arranged on the back of the fastening piece 322, and a screw 325 that passes through the fixed block 324 and is fixedly connected to the fastening piece 322. The screw 325 is threadedly connected to the fixed block 324, and the extension direction of the slide rail 323 is perpendicular to the extension direction of the guide rail 15.

[0129] Such a configuration allows the distance between the tightening member 322 and the fitting member 321 to be adjustable, thereby facilitating adjustment of the tightness of the tightening member 322 and the fitting member 321 on the rear roller 262 .

[0130] The quick freezer also includes a cold air circulation device for forced circulation of cold air in the freezing chamber 11. The cold air circulation device includes a fan 41 fixedly arranged between the cold air delivery branch pipes 33, a motor 42 arranged in the electric control room 13 for driving the fan 41, and a guide plate 43 mounted on the fan 41.

[0131] The guide plate 43 has an opening, and the fan 41 is positioned within the opening. A ventilation space is defined between the guide plate 43 and the inner wall of the housing 10. The fan 41 directs airflow toward the inner wall of the housing 10, and air outlets are provided on all four sides of the guide plate 43. This arrangement allows air to flow in from the middle of the guide plate 43 and out from its periphery, creating a continuous airflow cycle that accelerates the freezing of food.

[0132] In this embodiment, the operation process is:

[0133] First, the conveyor frame 25 carrying the conveying mechanism 21 is pushed into the freezer compartment 11 of the machine body 10; this process is as follows: under the push of external force, the front roller 261 of the conveyor frame 25 first rolls along the extension direction of the guide rail 15 on the bottom surface of the freezer compartment 11, passes through the second limit assembly 32 and reaches the lower section 151 of the guide rail 15; then the rear roller 262 contacts the introduction area formed by the introduction slope 322a and the matching member 321 of the fastening member 322, and under the action of continuous thrust, the rear roller 262 passes through the introduction area formed by the fastening plane 322c and the matching member 321. area, thereby abutting against the lead-out area formed by the lead-out inclined surface 322b and the matching piece 321, thereby limiting the backward movement of the rear roller 262; at the same time, the front roller 261 pushes away the guide portion 315 of the first limiting assembly 31 and causes the clamping portion 313 connected to the guide portion 315 to stretch upward, thereby pulling the detour portion 314 until the front roller 261 abuts against the abutting portion 312. The front roller 261 tends to slide down on the downward end 151. At the same time, the clamping portion 313 is tightly attached to the front roller 261 due to the elastic restoring force of the detour portion 314, thereby limiting the rolling of the front roller 261;

[0134] Then, the reduction motor and the driving shaft 212 of the conveying mechanism 21 are connected via the coupling 215 , and the sealing door 14 is closed.

[0135] Next, the conveying device in the electric control room 13 is started and starts to convey food. At the same time, the refrigeration device starts to convey refrigerated gas, the cold air circulation device is also started, and the fan 41 rotates.

[0136] The food enters the freezer compartment 11 of the machine body 10 through the top opening and is conveyed to the end of the conveying mechanism 21 by the mesh belt 211 in the conveying mechanism 21. The load-bearing surface 243g of the loading and unloading groove 244 in the turner 24 in the turning mechanism receives the food. The turner body 241 of the turner 24 rotates, so that the loading and unloading groove 244 is converted from a load-bearing state to a turning state, so that the food is turned over. Then, the loading and unloading groove 244 enters an unloading state. Under the action of the sliding surface 243h, the food slides down to the baffle 23 and is guided to the next conveying mechanism 21 through the baffle 23. This process is repeated until the food comes out of the lower opening of the machine body 10.

[0137] This completes the operation process of this embodiment.

[0138] Compared with the prior art, the present invention has the following advantages: the quick-freezing machine of the present invention reduces the occupied space by arranging multiple conveying mechanisms in a stacked and reciprocating manner, and enables food to be transferred and transported between the conveying mechanisms, thereby preventing food from sticking together; at the same time, granular food rolls and flips when being transferred from one conveying mechanism to the next, further preventing food from sticking together;

[0139] By setting up multiple conveying troughs to freeze different types of food, different types of food can be quickly frozen at the same time, thereby improving freezing efficiency;

[0140] By setting up the flipping mechanism, the food is flipped between the two conveying mechanisms and transferred to the next conveying mechanism. After multiple flipping, the food is evenly frozen during transportation, which improves the freezing efficiency and avoids food adhesion. In addition, the setting of the flipping mechanism performs a secondary conduction effect on the food in height, preventing the food from falling directly from the previous conveying mechanism to the next conveying mechanism and damaging the food.

[0141] The setting of the limiting component limits the conveying frame, thereby improving the stability of the conveying mechanism in conveying work; and the setting of the first limiting component limiting the front roller and the second limiting component limiting the rear roller further improves the stability of the conveying mechanism; during the operation of the transmission conveying device, vibrations are continuously generated to cause the roller to roll, wherein the setting of the first limiting component and the lowering section of the guide rail increases the difficulty of the roller to retreat, improves the stability of the roller, and avoids the situation where the roller retreats; the setting of the second limiting component further increases the difficulty of the roller to retreat, thereby improving the stability of the roller;

[0142] By setting up the cold air circulation device, the cold air circulation in the freezer is strengthened, and the freezing efficiency of the cold air on the food is improved.

[0143] Although the present invention has been shown and described with respect to one or more implementations, those skilled in the art will recognize equivalent variations and modifications based on reading and understanding this specification and the accompanying drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the appended claims. In addition, although a particular feature of the present disclosure has been disclosed with respect to only one of several implementations, such a feature may be combined with one or more other features of other implementations that may be desirable and advantageous for a given or specific application. Moreover, to the extent that the terms "comprises," "has," "contains," or variations thereof are used in specific embodiments or claims, such terms are intended to be included in a manner similar to the term "comprising."

[0144] In summary, although the present invention has been disclosed above through the use of embodiments, the serial numbers preceding the embodiments, such as "first" and "second," are used merely for descriptive convenience and do not limit the order of the embodiments of the present invention. Furthermore, the above embodiments are not intended to limit the present invention. Persons skilled in the art may make various modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A turning mechanism, characterized in that: The overturning mechanism is arranged between the conveying mechanism and the baffle, and is used to overturn the food conveyed by the conveying mechanism and transfer it to the baffle or the conveying head end of the next conveying mechanism; The turning mechanism includes a turner for receiving and turning the food and unloading the food to the next conveying mechanism and a motor for driving the turner to rotate. The rotation direction of the turner is consistent with the rotation direction of the driving shaft of the conveying mechanism. The flipper comprises: The cylindrical turning device body is rotatably connected to the motor via a rotating shaft; Side plates are provided at both ends of the turner body; A plurality of bearing plates are evenly arranged on the circumferential surface of the flipper body around the axis of the flipper body; A loading and unloading slot is defined between the side plate, the flipper body and the adjacent carrying plate; The supporting plate includes a fixing portion fixedly connected to the flipper body, a supporting portion extending from the fixing portion toward the outside of the flipper body, and a guide hook portion provided at a free end of the supporting portion, wherein the guide hook portion is warped from the free end of the supporting portion; The fixing parts are connected to each other and cover the circumferential surface of the flipper body, and the fixing parts include a first connecting surface and a second connecting surface; the bearing part includes a receiving surface connected to the first connecting surface and an unloading surface connected to the second connecting surface and located on the back of the receiving surface; the guide hook part includes an introduction surface connected to the receiving surface and an exit surface connected to the unloading surface, the introduction surface is an arc surface and warps toward the outside of the notch of the loading and unloading groove; The introduction surface and the receiving surface form a bearing surface, the second connecting surface, the unloading surface and the leading-out surface form a sliding surface, and the bearing surface, the first connecting surface and the sliding surface of the previous bearing plate constitute the loading and unloading groove.

2. The turning mechanism according to claim 1, characterized in that: The loading and unloading chute has a loading state for receiving food, a flipping state for flipping the received food, and an unloading state for unloading the flipped food during rotation; When the loading and unloading groove is in a load-bearing state, the notch of the loading and unloading groove faces the conveying mechanism; when the loading and unloading groove is in a flipping state, the notch of the loading and unloading groove faces upward, and the bottom height of the loading and unloading groove is lower than the conveying plane of the conveying mechanism; when the loading and unloading groove is in an unloading state, the notch of the loading and unloading groove faces the baffle.

3. The turning mechanism according to claim 1, characterized in that: There are five supporting plates, the angle between the first connecting surface and the supporting surface is greater than or equal to 90°, the second connecting surface and the unloading surface are in the same plane, and the angle between the first connecting surface and the sliding surface is an obtuse angle.

4. The turning mechanism according to claim 1, wherein: The bearing surface is a flexible surface, and the sliding surface is a smooth surface.

5. A quick freezer, characterized in that: The invention comprises the turning mechanism according to any one of claims 1 to 4, wherein the conveying mechanism is driven by a driving mechanism to rotate and convey, a plurality of the conveying mechanisms are arranged in a stacked manner, and the conveying directions of adjacent conveying mechanisms are opposite, and the baffle is arranged between the conveying mechanisms and is located on one side of the conveying end of the conveying mechanism; The quick-freezing machine further comprises a body and a refrigeration device, wherein the body comprises a freezing chamber for quick-freezing food, a drive installation chamber independently arranged on one side of the freezing chamber, and an electric control chamber independently arranged on the other side of the freezing chamber; The conveying mechanism is arranged in the freezing chamber, the reduction motor of the driving mechanism is installed in the driving installation chamber, and the rotating shaft of the reduction motor penetrates the freezing chamber and is connected to the driving shaft through a coupling; The refrigeration device includes a cold air delivery main pipe arranged in the electric control room, a control valve arranged on the cold air delivery main pipe, cold air delivery branches arranged on both sides of the inner wall of the freezing chamber and connected to the cold air delivery main pipe, and a nozzle arranged on the cold air delivery branch pipe.

6. The quick freezer according to claim 5, characterized in that The quick freezer further includes a cold air circulation device for forcibly circulating cold air in the freezing chamber, the cold air circulation device including a fan fixedly arranged between the cold air delivery branch pipes, a motor arranged in the electric control chamber for driving the fan to rotate, and a guide plate sleeved on the fan; The guide plate is provided with an opening, the fan is arranged in the opening, and a space for ventilation is provided between the guide plate and the inner wall of the body; The air outlet direction of the fan faces the inner wall of the machine body, and air outlets are arranged on all four sides of the guide plate.

7. The quick freezer according to claim 5, characterized in that The conveying mechanism is arranged on a conveying frame, and rollers are arranged at the four corners of the bottom of the conveying frame; One side of the machine body is provided with a sealed door for facilitating the conveyor frame to enter or exit the machine body, and a guide rail provided on the bottom surface of the machine body for rolling connection with the roller; the quick freezer further includes a limit assembly for limiting the rolling of the roller; The roller comprises a roller body and a groove ring recessed on the circumferential surface of the roller body and used for rolling engagement with the guide rail; The rollers include a front roller away from the sealing door and a rear roller close to the sealing door; the limiting assembly includes a first limiting assembly provided at the end of the guide rail for limiting the front roller; The first limiting assembly includes a support portion fixedly connected to the body, an abutment portion extending from a free end of the support portion and forming a matching groove ring, a clamping portion cooperating with the abutment portion for clamping the front roller, a detour portion connected between the abutment portion and the clamping portion, and a guide portion formed at the free end of the clamping portion; The detour portion is in an inverted U-shape and has a restoring force for elastic deformation. The abutment portion, the detour portion and the clamping portion constitute an elastic clamping structure. The guide portion is in a V-shape to guide the front roller into or out of the range of the elastic clamping structure. When the first limiting assembly limits the front roller, the detour portion is in an elastically stretched state, and the abutting portion and the clamping portion are tightly fastened to the groove ring to limit the front roller; One end of the guide rail close to the first limiting assembly is in a downward sliding shape; when the first limiting assembly limits the front roller, the front roller has a downward sliding trend and abuts against the support portion.

8. The quick freezer according to claim 7, characterized in that The limiting assembly further includes a second limiting assembly disposed at the starting end of the guide rail for limiting the rear roller, the second limiting assembly including a matching piece fixedly disposed on one side of the guide rail and a fastening piece disposed on the other side of the guide rail and opposite to the matching piece; The convex end surface of the fastening member facing one end of the mating member is composed of an introduction slope for introducing the rear roller into the machine body, an outlet slope for leading the rear roller out of the machine body, and a fastening plane connected to the introduction slope and the outlet slope. The distance from the tightening plane to the matching piece is smaller than the width of the rear roller, so as to limit the rear roller from passing through the tightening plane. The distances from the leading-in slope and the leading-out slope to the matching piece gradually increase from the inside to the outside. The included angle between the leading-out inclined surface and the tight plane is smaller than the included angle between the leading-in inclined surface and the tight plane, and the vertical distance between the two ends of the leading-out inclined surface is larger than the vertical distance between the two ends of the leading-in inclined surface.

9. The quick freezer according to claim 8, characterized in that One end of the fastening member provided with the convex end surface is hollowed out to provide a plurality of through holes, wherein the density of the through holes on the side close to the introduction slope is greater than the density of the through holes on the side close to the exit slope.

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