CN112849487B

CN112849487B - Self-accumulation type spiral refrigeration conveying device

Info

Publication number: CN112849487B
Application number: CN202110418170.1A
Authority: CN
Inventors: 盛冬平
Original assignee: Changzhou Institute of Technology
Current assignee: Changzhou Institute of Technology
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-03-29
Anticipated expiration: 2041-04-19
Also published as: CN112849487A

Abstract

The invention discloses a self-stacking type spiral refrigeration conveying device which comprises a base assembly, a support system, a spiral-linear conveying chain system and a motor-driving chain-track system. The base assembly realizes that accumulated water on the bottom plate can automatically flow from the periphery through the ramp and is discharged through the water outlet, thereby obviously reducing the maintenance difficulty of equipment and improving the utilization rate of the equipment; through a plurality of groups of roller devices and matching with an external gravity tensioning assembly mechanism, the self-adaptive tensioning of the food conveying chain net is realized, and the food conveying stability is obviously improved; by designing the unique T-shaped rail-double bearing supported rail assembly, the design is obviously simplified, the processing difficulty is reduced, and the maintainability of the rail assembly is improved; through designing the spring-piston cylinder type self-adaptive chain tensioning assembly, the tensioning force of the chain can be automatically matched according to the change of external load, and in addition, the manual adjustment can be carried out to adapt to the adjustment of the tensioning force under the condition of large deformation generated by the chain and the like.

Description

Self-accumulation type spiral refrigeration conveying device

Technical Field

The invention relates to a conveying device, in particular to a self-stacking type spiral refrigeration conveying device which is simple in structure, high in stability and convenient to maintain.

Background

The spiral food refrigerating and conveying device mainly comprises two types at present, wherein the first type drives a conveying chain through a spiral driving track, the method results in the fact that the driving chain length is long and the space utilization rate is low, the second type drives the spiral conveying device through a self-stacking type, the driving chain is short and the space utilization rate is high, the occupied space of equipment for conveying food with the same quantity is far lower than that of the first type, and the spiral food refrigerating and conveying device is also an advanced conveying method at present, but several important problems exist in the method at present to be solved. Firstly, the whole structure of the equipment is complex, and the maintenance difficulty is high; and secondly, the bottom spiral track part is complex to process, the service life of the internally adopted rolling friction structure is short, and the damage is easily caused, so that the production stop maintenance is caused.

Disclosure of Invention

In view of the above problems in the prior art, the present invention provides a self-stacking screw refrigeration transport device. The self-accumulation type spiral refrigeration conveying device solves one or more of the following problems: 1) the food is accumulated with water and becomes ice in the refrigeration and transportation process; 2) the tensioning problem of the food conveying chain in the conveying process; 3) the problem that the track assembly is too complex and inconvenient to maintain; 4) the tensioning of the drive chain during operation.

In order to achieve the purpose, the invention provides the following technical scheme:

a self-stacking type spiral refrigeration conveying device comprises a base assembly, a support system, a spiral-linear conveying chain system and a motor-driving chain-track system; the base assembly provides support for the rack system; the support system is used for providing support for other systems and comprises an upper horizontal conveying chain support, a lower horizontal conveying chain support, an outer ring support frame and an inner ring support frame;

the spiral-linear conveying chain system comprises a lower horizontal conveying chain, a spiral ascending conveying chain and an upper horizontal conveying chain which are connected in a circulating manner; the lower horizontal conveying chain is arranged on the lower horizontal conveying chain support, the upper horizontal conveying chain is arranged on the upper horizontal conveying chain support, and the conveying chain which spirally ascends is arranged between the outer ring support frame and the inner ring support frame; the conveying chain comprises a plurality of conveying chain units which are connected end to end, each conveying chain unit comprises a conveying chain side plate, a supporting rod and a conveying net, the supporting rods are arranged between the two opposite conveying chain side plates, and the conveying nets are arranged on the supporting rods;

the motor-driving chain-track system comprises a motor, a chain wheel, a driving chain and a guide rail mechanism, wherein the guide rail mechanism comprises a T-shaped track, the driving chain comprises a plurality of chain links connected end to end, the chain links comprise chain outer plates, one end of each chain outer plate is bent downwards to form an L shape, the other end of each chain outer plate is provided with a rotating sleeve through a fixed pin shaft, the chain wheel is meshed with the driving chain at the rotating sleeve, the lower ends of the rotating sleeves of the adjacent chain links are hinged through limiting strips, one side of the T-shaped track is alternately provided with a rotatable radial supporting bearing and an axial supporting bearing along the extending direction, the rotating shafts of the radial supporting bearing and the axial supporting bearing are respectively arranged on two mutually vertical surfaces on the same side of the T-shaped track, the bending surface of each chain outer plate is matched with the outer sides of the radial supporting bearing and the axial supporting bearing, a groove rail is arranged on the vertical surface on the other side of the T-shaped track along the extending direction, the rotating sleeve is matched with the outer side of the groove rail, a limiting guide plate is arranged on the top surface of the chain outer plate, and a conveying chain side plate of the conveying chain unit is arranged on the limiting guide plate.

The spring-piston cylinder type multi-connecting-rod self-adaptive tensioning mechanism comprises a fixed base, a rotating shaft seat, a guide fixed cylinder, a push rod, a connecting rod, a rotating shaft and an outer tensioning wheel, wherein the rotating shaft seat is limited on the fixed base through a clamping plate, one end of the guide fixed cylinder is fixed on the rotating shaft seat, the other end of the guide fixed cylinder is of a cylindrical structure, one end of the push rod is installed in an inner cavity of the guide fixed cylinder, a pressure spring is arranged between the inner end face of the guide fixed cylinder and the end face of the push rod, the connecting rod is limited and installed on the fixed base through a pin shaft and the clamping plate, the rotating shaft is installed on the connecting rod through the clamping plate, the other end of the push rod is rotatably connected with the rotating shaft, and the outer tensioning wheel is installed at the bottom end part of the rotating shaft and can be meshed with a driving chain at a rotating sleeve.

Furthermore, the guide fixing cylinder is provided with a waist-shaped groove extending along the axial direction, the end part of the push rod is provided with a hole, and the limiting rod is arranged in the hole of the push rod and the waist-shaped groove of the guide fixing cylinder.

Further, the conveying chain side plate comprises an upper supporting surface, a first lower supporting surface, a first side limiting surface, a supporting bottom surface and a limiting surface, the first side limiting surface is outwards bent along the direction perpendicular to the plane formed by the upper supporting surface and the first lower supporting surface, the extending direction of the limiting surface is opposite to the bending direction of the first side limiting surface and is connected with the supporting bottom surface, the limiting guide plate comprises a second lower supporting surface and a second side limiting surface, the second side limiting surface is perpendicular to the second lower supporting surface, guide surfaces which are outwards bent are arranged on the three end surfaces of the second side limiting surface and the end surfaces of the two sides of the second lower supporting surface, and the limiting surface of the conveying chain side plate is attached to the second side limiting surface of the limiting guide plate.

Furthermore, the base assembly comprises an outer frame consisting of an upper cover plate, a peripheral long coaming, a peripheral short coaming and a bottom plate, a sash structure consisting of an inner short coaming, an inner long coaming, an inner transverse plate and an inner longitudinal plate is fixedly arranged in the outer frame, a short slope panel and a long slope panel which are provided with upwards protruding bevel structures are arranged between the periphery of the sash structure and the outer frame, and water outlets are formed in four corner parts of the base assembly.

Further, in the spiral-linear conveying chain system, a conveying chain reversing mechanism is arranged between the horizontal conveying chain and the spiral conveying chain, the conveying chain reversing mechanism comprises a roller assembly A, a roller assembly B, a roller assembly C, a roller assembly D, a roller assembly E, a roller assembly F and a roller assembly G, the spiral conveying chain at the roller assembly A enters the upper horizontal conveying chain, and enters the lower horizontal conveying chain after being reversed by the roller assemblies B, C, D, E and F from the roller assembly A; after the direction is changed through the roller assembly G, the part enters the spiral conveying chain again; after passing through the spiral conveying chain, the conveying belt reaches the roller assembly A again, and the second circulation is started.

Further, roller component D is the structure that can slide from top to bottom, and its both ends are connected with the balancing weight, utilize the dead weight to make whole conveying chain tensioning.

Compared with the prior art, the invention has the beneficial effects that:

1) by designing the brand new base assembly, accumulated water on the bottom plate can automatically flow from the periphery through the ramp and is discharged through the water outlet, the maintenance difficulty of equipment is obviously reduced, and the utilization rate of the equipment is improved;

2) the self-adaptive tensioning of the food conveying chain net is realized by designing a plurality of groups of roller devices and matching with an external gravity tensioning assembly mechanism, so that the food conveying stability is obviously improved;

3) a unique T-shaped rail-double bearing supported rail assembly is designed, so that the design is obviously simplified, the processing difficulty is reduced, and the maintainability of the rail assembly is improved;

4) a brand-new spring-piston cylinder type self-adaptive chain tensioning assembly is designed, the tensioning force of the chain can be automatically matched according to the change of external load, and in addition, the manual adjustment can be carried out to adapt to the adjustment of the tensioning force under the condition of large deformation generated by the chain and the like.

Drawings

FIG. 1 is a schematic diagram of a self-stacking screw refrigeration transport device;

FIG. 2 is a schematic structural view of a base assembly;

FIG. 3 is an exploded view of the base assembly;

FIG. 4 is a schematic diagram of a self-stacking screw refrigeration transport device (without a base);

FIG. 5 is a top view of a self-stacking spiral refrigeration transport device;

FIG. 6 is a side view of a self-stacking screw refrigeration transport device (without a base);

FIG. 7 is a schematic view of the construction of a linear conveyor belt;

fig. 8 is a schematic view of the structure of a spiral conveyor belt (the support rods 12 and the mesh belt 13 are not shown);

FIG. 9 is a front view of the spiral conveyor belt;

FIG. 10 is a schematic diagram of a motor-track-spiral conveyor system;

FIG. 11 is a top view of a motor-track-spiral conveyor system;

FIG. 12 is a schematic structural diagram of the transmission system;

FIG. 13 is a top plan view of the transmission system;

FIG. 14 is a schematic structural view of a support rail-chain-conveyor system;

FIG. 15 is an exploded view of the support rail-chain-conveyor system;

fig. 16 is an exploded view of a support rail-chain-conveyor system (single chain only);

FIG. 17 is a view of the chain support track and chain assembly;

FIG. 18 is a schematic view of the structure of a link;

FIG. 19 is a schematic view of the structure of the conveyor side support plate;

FIG. 20 is a schematic view of the construction of the position limiting guide plate;

FIG. 21 is a schematic structural view of the tensioning assembly;

FIG. 22 is a top view of the tensioning assembly;

FIG. 23 is an exploded view of the tensioning assembly;

fig. 24 is a schematic structural view of the support bearing.

Detailed Description

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

The self-stacking type spiral refrigeration conveying system is used for conveying food at normal temperature into a low-temperature area through a conveying belt, conveying and cooling the food after a period of time, and then outputting the food, and then packaging and transporting the food.

As shown in fig. 1, the self-stacking spiral refrigeration conveying device includes a base assembly 68, a support system, a spiral-linear conveying chain, a motor-drive chain system, a support rail system, and a conveying chain reversing system. The support system comprises an upper conveying belt supporting assembly 60, a horizontal conveying supporting assembly 61, an inner and outer motor-track and tensioning assembly 62, a conveying chain assembly 63, an outer conveying chain support 64, an inner conveying chain support 65, an inner periphery transverse support 82, an outer periphery transverse support 83, an upper enclosing plate 66 and an outer periphery support frame 67. The conveying chain reversing system comprises a discharge port roller assembly 56, a reversing roller assembly 57, a gravity tensioning assembly 58, a bottom conveying roller assembly 59 and a feed port roller assembly 69.

The base assembly is constructed as shown in fig. 2-3 and is used to provide support for all of the modules. The problem of drainage needs to be considered in the design as no water can build up on the base assembly, which can lead to ice accumulation. As can be seen from figure 2, the base assembly comprises an outer frame consisting of an upper cover plate 1, a peripheral long coaming 2, a peripheral short coaming 3 and a bottom plate 8, wherein an inner short coaming 6, an inner long coaming 7, an inner transverse plate 9 and an inner longitudinal plate 10 are welded in the frame to form a lattice structure, and a short slope panel 4 and a long slope panel 5 are arranged between the periphery of the lattice structure and the outer frame. Four water outlets 3.1 are arranged at four right-angle parts of the base assembly, and the accumulated water on the upper cover plate 1 is discharged through the water outlets by the waste water collected by the slope panels 4 and 5. The form designs the four-channel slope surface dewatering structure.

As shown in fig. 4-5, the self-stacking spiral refrigeration conveyor includes a spiral conveyor chain support assembly 64 for supporting the motor, track, drive chain and spiral-lift conveyor chain. The upper horizontal conveyor chain support 60 and the lower horizontal conveyor chain support 77 are used to provide support for the conveyor chain of the spiral conveyor chain entering the linear track. The direction conversion between the spiral track and the linear track is completed by a roller assembly A77, a roller assembly B70, a roller assembly C71, a roller assembly D72, a roller assembly E73, a roller assembly F74 and a roller assembly G75.

Fig. 7 is a partially assembled view of the conveyor chain, mainly including the conveyor chain side plates 11, the support bars 12, and the conveying net 13. The spiral conveyor chain portion and the straight conveyor chain portion are a circular unit, wherein fig. 8 shows only the spiral conveyor portions of the conveyor chain side plates 11, with the food product placed on the conveyor net 13 between each layer. Fig. 9 is a front view of the conveying screw, and it can be seen that point a is a starting point of the conveying screw entering the linear conveying section, and point H1 is a starting point of the linear conveying chain entering the conveying screw. As can be seen from the enlarged view of the part, the whole spiral conveying part is formed by overlapping a plurality of layers (only a first layer 79, a second layer 80 and a third layer 81 are shown in the figure) of conveying chains, and food is placed between each layer.

FIG. 6 is a front view of the conveyor system assembly. The circuit of the entire conveyor chain can be seen in connection with fig. 9:

1) the A point position spiral conveying line enters a linear conveying support, so that the spiral transmission is changed into linear transmission

2) The steel wire rope enters the lower straight line supporting rail from the position A to the position B1 after being reversed by the roller assemblies B, C, D, E and F;

3) the conveying chain passes through the lower linear supporting track, then is reversed through the roller assembly G, and then enters the middle linear track 76 again;

4) after passing through the middle linear track, the part reaches H1, and the point is the entry point of the linear conveyor chain into the spiral conveyor chain;

5) after a period of spiral rise, point a is reached again and a second cycle begins.

In addition, the roller assembly D in fig. 6 is designed to be capable of sliding up and down, and two ends of the roller assembly D are connected with the counterweight block connecting mechanisms 78, the mechanisms are connected with the counterweight blocks, the tensioning of the whole conveying chain is realized by the aid of the self-weight, and the conveying chain is ensured to convey food stably.

The above-mentioned is the conveying chain for conveying food, and its movement must be driven by means of motor-driving chain-track assembly mounted on the bottom portion of spiral conveying chain, so that it can make the linear conveying chain portion be fed into the spiral-lifting portion, and make it be spirally lifted, then make it be fed into the linear conveying portion at point A, finally make it pass through several groups of reversing roller assemblies, and then make it be fed into the spiral conveying chain at point H1 again.

Fig. 10 is a motor-track-drive chain-conveyor chain assembly with the screw conveyor chain between the inner 82 and outer 83 lateral supports and resting on the drive chain which travels in rolling friction on the track under the drive of the inner and outer motors, only the outer track motor drive assembly 62.1 and the outer track driven tension assembly 62.2 being shown. Thus, the chains arranged on the inner track and the outer track are driven to rotate by the inner motor and the outer motor to form an inner driving chain loop and an outer driving chain loop, and two ends of the conveying chain are respectively seated on the driving chains and rotate along with the driving chains, so that the spiral lifting of the spiral conveying chain is driven.

Fig. 11 is a top view of the motor-track-drive chain-conveyor chain assembly. As can be seen, the outer race track is fixed to the support frame 14, the outer race chain 30.1 is driven by the outer track motor drive assembly 62.1 and tensioned by the outer track driven tensioning assembly 62.2, and the inner race chain 30.2 is driven by the inner track motor drive assembly 62.3 and tensioned by the outer track driven tensioning assembly 62.4, ensuring positional accuracy during chain drive. Similarly, the inner track is composed of an inner track motor drive assembly and a chain tensioning assembly.

Fig. 12 is a diagram of a drive system, and fig. 13 is a top view of the drive system, in which the support bars 12 and the conveying wire 13 of the conveyor chain are not shown. In the figure, an outer ring motor driving assembly drives an outer ring driving chain wheel 16 to rotate so as to drive a chain to move, and an outer tension chain wheel 17 in an outer ring tension device ensures that the driving chain is in a certain tension state. Likewise, the inner race drive sprocket 18 and the tension sprocket 19 serve the same function. Only the first layer of outer spiral track conveyor chains 84 and the first layer of inner spiral track conveyor chains 85 are shown.

Fig. 14 is a supporting rail-chain-conveyor chain system, and fig. 15 is an exploded view of the supporting rail-chain-conveyor chain system, showing only one layer of the conveyor chain without the supporting bars 12 and the conveying net 13. In the figure, the outer track assembly 20 is fixedly mounted on the outer track support 14, the inner track assembly 22 is mounted on the inner track support frame 15, and the track itself is in a spiral rising curve. The outer drive chain assembly 21 in fig. 15 is part of a complete chain, and the inner drive chain assembly 23 is part of a complete chain, which is schematically shown in fig. 13.

As can be seen from fig. 13, 15 and 16, the outer-ring chain engages with the WD2 point of the drive sprocket 16 from the WD3 point located at the top dead center of the spiral track, exits from the WD1 point, enters the WP1 point, enters the WP3 point located at the bottom dead center of the track through the WP2 point, travels for a large number of revolutions, reaches the WD3 point again, and then circulates again. The running track of the inner ring chain is similar to that of the outer ring, ND3 → ND2 → ND1 → NP1 → NP2 → NP3 → spiral track → ND 3.

Fig. 17-18 are detailed views of the chain support track and chain assembly relationship. In the figure, the limit guide plate 24, the outer chain plate 25, the inner chain plate 26, the rotary sleeve 27, the fixed pin shaft 28 and the limit strip plate 29 form one chain link of the chain, and the whole chain is formed by connecting a plurality of chain links end to end. The T-shaped spiral track frame 30, the limiting sleeve 31, the radial supporting bearing 32, the nylon groove track 33 and the axial supporting bearing 34 are assembled together to form a sliding track assembly. It should be noted that the radial support bearing 32 and the axial support bearing 34 are connected with the threaded holes on two mutually perpendicular surfaces of the T-shaped rail frame through the external threads (as shown in fig. 24) at one end, and the distance between the bearings and the rail surface is controlled through the stop collar 31. And a limiting guide plate 24 (shown in figure 20) is welded above the chain link and used for limiting the radial position of the side plate 11 of the conveying chain. Fig. 17 clearly shows the assembly of the drive chain and the track assembly, and since the track assembly is fixed, the drive chain assembly slides on the track under the action of the motor, and in order to reduce friction and complexity of the structure, the structural form of the support bearing and the rotating sleeve 27 is adopted to realize pure rolling friction, and wear of the structure is reduced to the maximum extent.

The conveying chain side plate 11 is shown in fig. 19, the structure enables the conveying chain to be stacked together through the upper supporting surface and the lower supporting surface, the side limiting surface and the limiting surface in fig. 19 can limit the displacement of the conveying chain net in the radial direction, and the limiting surface in fig. 19 is attached to the side limiting surface in fig. 20, so that the function of positioning the conveying chain net is achieved. In addition, the guide surfaces in fig. 20 are used to adjust the positional error of the side plates of the drive conveyor chain as the conveyor chain web enters the spiral drive chain, ensuring that the conveyor chain web can accurately enter a predetermined position.

Fig. 21 is a spring-piston cartridge multi-link adaptive tensioning assembly with manual adjustment and automatic adjustment over a range, fig. 22 is a top view of the tensioning assembly, and fig. 23 is an exploded view of the tensioning assembly.

The fixed base 36 is installed at the bottom area of the inner and outer ring conveyor chain support shown in fig. 10, the upper support plate 41 and the lower support plate 42 are fixedly installed on the bottom plate 36 through bolts, and the rotating shaft seat 50 is limited in the holes of the upper and

lower support plates

41 and 42 through the clamping

plates

52 and 54. One end of the guide fixing cylinder 35 is fixedly installed on the rotating shaft seat 50 through an outer fixing nut 51 and an inner fixing nut 53, the upper connecting rod 45 is installed on the upper supporting plate 41 in a limiting mode through an upper pin shaft 47 and a clamping plate 48, the lower connecting rod 43 is installed on the lower supporting plate 42 through a lower pin shaft 44 and a clamping plate 49, the upper end of the rotating shaft 38 is installed on the upper connecting rod 45 through the clamping plate 46, the lower end of the rotating shaft 38 is installed together with the lower connecting rod 43, one end of the push rod 37 is installed in an inner cavity of the guide fixing cylinder 35, and the other end of the push rod 37 is installed together with the rotating shaft 38. The pressure spring 40 is installed between the end surface of the interior of the guide fixing cylinder and the end surface of the push rod. The outer tensioner wheel 17 is mounted on the bottom of the shaft 38 by a bearing 55. In addition, a limiting rod 39 is installed in a hole of the push rod 37 and a waist-shaped groove of the guide positioning cylinder 35, and is used for limiting the left limit position and the right limit position of the push rod 37 and protecting the use safety of the tensioning device.

The working principle is as follows:

1) when the pressure spring 40 is installed for the first time, a certain pre-compression amount is generated, so that the chain assembled on the chain wheel 17 is tensioned, and when the force of the chain acting on the tensioning wheel 17 changes within a certain range, the push rod 37 generates a certain displacement in the guide fixing cylinder 35, so that the thrust of the pressure spring 40 is correspondingly changed, and the tensioning force of the chain is ensured;

in the case where the self-adjusting space of the spring 40 in the tensioning mechanism is insufficient to provide a sufficient tensioning force when the plastic deformation is elongated due to an external cause such as deformation of the chain under a long-term force, it is possible to fix the position by adjusting the installation distance of the guide fixing cylinder 35 to the rotary shaft base 50 and by the

lock nuts

51 and 53.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-stacking type spiral refrigeration conveying device comprises a base assembly, a support system, a spiral-linear conveying chain system and a motor-driving chain-track system; the base assembly provides support for the rack system; the support system is used for providing support for other systems and comprises an upper horizontal conveying chain support, a lower horizontal conveying chain support, an outer ring support frame and an inner ring support frame; it is characterized in that the preparation method is characterized in that,

2. The self-stacking spiral refrigeration conveying device as claimed in claim 1, further comprising a spring-piston cylinder type multi-link self-adaptive tensioning mechanism, which comprises a fixed base, a rotating shaft seat, a guide fixed cylinder, a push rod, a link rod, a rotating shaft and an external tensioning wheel, wherein the rotating shaft seat is limited on the fixed base through a clamping plate, one end of the guide fixed cylinder is fixed on the rotating shaft seat, the other end of the guide fixed cylinder is of a cylindrical structure, one end of the push rod is installed in an inner cavity of the guide fixed cylinder, a pressure spring is arranged between an inner end face of the guide fixed cylinder and an end face of the push rod, the link rod is limited on the fixed base through a pin shaft and the clamping plate, the rotating shaft is installed on the link rod through the clamping plate, the other end of the push rod is rotatably connected with the rotating shaft, and the external tensioning wheel is installed at the bottom end portion of the rotating shaft and can be engaged with a driving chain at a rotating sleeve.

3. The self-stacking spiral refrigeration conveying device as claimed in claim 2, wherein the guide fixing cylinder is provided with a waist-shaped groove extending along the axial direction, the end part of the push rod is provided with a hole, and the limiting rod is arranged in the hole of the push rod and the waist-shaped groove of the guide fixing cylinder.

4. The self-stacking spiral refrigeration conveying device according to claim 1, wherein the conveying chain side plate comprises an upper supporting surface, a first lower supporting surface, a first side limiting surface, a supporting bottom surface and a limiting surface, the first side limiting surface is bent outwards along a direction perpendicular to a plane formed by the upper supporting surface and the first lower supporting surface, the extending direction of the limiting surface is opposite to the bending direction of the first side limiting surface and is connected with the first side limiting surface through the supporting bottom surface, the limiting guide plate comprises a second lower supporting surface and a second side limiting surface, the second side limiting surface is perpendicular to the second lower supporting surface, outwards bent guide surfaces are arranged on three end surfaces of the second side limiting surface and two side end surfaces of the second lower supporting surface, and the limiting surface of the conveying chain side plate is attached to the second side limiting surface of the limiting guide plate.

5. The self-stacking screw conveyer unit as claimed in claim 1, wherein the base assembly comprises an outer frame consisting of an upper cover plate, a long peripheral enclosing plate, a short peripheral enclosing plate and a bottom plate, a lattice structure consisting of a short inner enclosing plate, a long inner enclosing plate, a transverse inner plate and a longitudinal inner plate is fixedly mounted inside the outer frame, a short slope plate and a long slope plate with an upward-protruding bevel structure are mounted between the outer periphery of the lattice structure and the outer frame, and water outlets are formed at four corners of the base assembly.

6. The self-stacking spiral refrigeration conveying device according to claim 1, wherein in the spiral-linear conveying chain system, a conveying chain reversing mechanism is arranged between the horizontal conveying chain and the spiral conveying chain, the conveying chain reversing mechanism comprises a roller assembly A, a roller assembly B, a roller assembly C, a roller assembly D, a roller assembly E, a roller assembly F and a roller assembly G, the spiral conveying chain at the roller assembly A enters the upper horizontal conveying chain, and enters the lower horizontal conveying chain after being reversed by the roller assemblies B, C, D, E and F; after the direction is changed through the roller assembly G, the part enters the spiral conveying chain again; after passing through the spiral conveying chain, the conveying belt reaches the roller assembly A again, and the second circulation is started.

7. The self-stacking spiral refrigeration conveying device as claimed in claim 6, wherein the roller assembly D is a structure capable of sliding up and down, and two ends of the roller assembly D are connected with balancing weights, so that the whole conveying chain is tensioned by self weight.