Multi-layer circulating hot air type drying device for sea cucumber deep processing and method thereof

Abstract

The present invention relates to the technical field of seafood processing, and more specifically, to a multi-layer circulating hot air drying device and method for deep-processing sea cucumbers. The device comprises a drying chamber, wherein a pair of centrally symmetrically arranged push-and-switch devices are provided within the drying chamber, a pair of transport devices disposed within the drying chamber, and a plurality of placement frames transported by the transport devices and arranged in staggered rows on the left and right sides. In this multi-layer circulating hot air drying device and method for deep-processing sea cucumbers, the placement frames are staggered within the drying chamber. The push-and-switch devices and the transport devices cooperate to force all placement frames to circulate through the various temperature zones of the drying chamber during the drying cycle, completely eliminating vertical temperature differences caused by upward heat flow and achieving uniform drying.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seafood processing, in particular to a multi-layer circulating hot air type drying device for deep processing of sea cucumber and a method thereof. BACKGROUND

[0002] The multi-layer circulating hot air type seafood drying device adopts a three-dimensional layered structure, combines a high-efficiency hot air circulation system, realizes precise temperature control drying for deep processing of seafood, has a multi-layer net belt conveying device built-in, cooperates with uniform air supply technology, ensures that fish fillets, shelled prawns, sea cucumbers and other materials are evenly heated, are quickly dehydrated while locking nutrients and freshness, is suitable for large-scale seafood processing enterprises, and improves drying efficiency and product quality.

[0003] The patent with the application number CN202120885779.5 discloses a cold air drying device for production and processing of seafood mushrooms, which comprises a machine body and a control panel. The outer wall of the machine body is provided with the control panel. The outer wall of the machine body is provided with a wire binding mechanism. The inner gap of the shell is matched with a bolt. The outer walls of the two bolts are both threaded into the shell and the machine body. The inner cavity of the shell is fixedly connected with a connecting rod. The cold air drying device for production and processing of seafood mushrooms is cooperatively used by the shell, the bolt, the connecting rod, the grooved wheel, the nut and the cover plate. The grooved wheel is used to wind the long wire. It prevents the wire from tripping the staff and facilitates wiring.

[0004] However, the traditional drying bin stores a fixed layer structure. The placement frame is a static stack, but the hot air naturally surges down, which can cause high temperature at the top and high humidity at the bottom. The position of the sea cucumber cannot be dynamically adjusted, which can cause uneven heating of the sea cucumber, inconsistent drying, and further affect the product quality. The top layer of sea cucumber is prone to surface cracking, and the bottom layer of sea cucumber is not fully dried. In order to balance the temperature and humidity, the traditional method stops the machine and opens the bin when the materials are replaced. Manual transfer not only interrupts the drying process and increases energy consumption, but also easily causes heat loss and reduces efficiency. The existing equipment may need additional motors or driving devices to realize movement, which has a complex structure and high cost.

[0005] In view of this, the present application provides a multi-layer circulating hot air type drying device for deep processing of sea cucumber and a method thereof. SUMMARY

[0006] The present application aims to provide a multi-layer circulating hot air type drying device for deep processing of sea cucumber and a method thereof. The telescopic cylinder drives the push plate to perform a bidirectional horizontal push frame action, and cooperates with the conveying device to solve the problems in the background technology.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] Multi-layer circulating hot air type drying device for deep processing of sea cucumber, comprising a drying bin, a pair of center-symmetrically arranged pushing and changing devices, a pair of conveying devices arranged in the drying bin, and a plurality of placing frames conveyed by the conveying devices and distributed in staggered layers on the right and left sides;

[0009] The pushing and changing device comprises a telescopic cylinder, a pushing plate driven by the telescopic cylinder, and two tooth plates located on the left and right sides of the upper pushing plate.

[0010] When the pushing plate is driven to move by the telescopic cylinder, the right bottom pushing plate pushes the inner placing frame to move left, and the left top pushing plate pushes the inner placing frame to move right.

[0011] The conveying device comprises two chain discs, a chain wrapped outside the two chain discs, a plurality of conveying frames regularly arranged on the chain, a plug rod connected to the end of the conveying frame, and a transmission group arranged outside the top chain.

[0012] The transmission group comprises a ratchet wheel, a ring tooth wrapped outside the ratchet wheel, a plurality of ratchet claws regularly arranged on the inner wall of the ring tooth, and an external gear meshing above the ring tooth.

[0013] When the top pushing plate is retracted, the tooth plates on both sides mesh with the external gear to drive the ring tooth, the ratchet claw drives the ratchet wheel to rotate in one direction, the ratchet wheel is coaxially fixed to the chain disc, the chain immediately pulls the conveying frame at a fixed step distance, and the plug rod inserted into the placing frame drives the right column of placing frames to move down and the left column of placing frames to move up, realizing the rotation of all placing frames in the vertical position, eliminating the vertical temperature difference in the drying bin, and achieving uniform drying.

[0014] In the technical scheme of the present application, the drying bin further comprises a bin body with openings at both left and right ends, a plurality of circulating fans fixedly connected to the outer walls of the bin body at both front and rear ends by screws, four bent frames fixedly welded to the inner walls of the openings at both left and right ends of the bin body, a bin door rotatably connected to the outside of the openings of the bin body by a hinge, and a pair of inner partitions symmetrically arranged at both front and rear ends of the bin door.

[0015] In the technical scheme of the present application, the inner partition comprises a fixed plate body fixedly welded to the inner wall of the bin body, an annular guide plate fixedly connected to the center of the inner wall of the fixed plate body by bolts, and a plurality of air guide grilles fixedly connected to the openings of the inner wall of the fixed plate body.

[0016] In the technical scheme of the present application, the inner wall center of the fixed plate body is welded with a bent plate with a cross-section in the shape of a concave character, a front-to-rear through limiting sliding groove is formed at the top position of the fixed plate body, a plurality of regularly distributed plate end openings are formed at both left and right ends of the fixed plate body, a through slot is formed on the bent plate of the inner wall of the fixed plate body, and the gap between the through slot and the annular guide plate forms an annular guide rail.

[0017] The above arrangement is used to ensure the stability of the internal environment of the drying bin, and provides a prerequisite for the drying of sea cucumbers.

[0018] In the technical scheme of the present application, the drying bin further comprises four limiting rods fixedly connected to the inner wall of the fixed plate body, a plurality of groups of parallelly arranged insertion slots are formed in the outer wall of the limiting rods, limiting protrusions are integrally formed on the outer walls of the upper and lower ends of the limiting rods, the limiting protrusion located at the upper end is located above the topmost insertion slot, and the limiting protrusion located at the lower end is located below the bottommost insertion slot.

[0019] This arrangement ensures the stability of the placing frame when being placed and vertically moved by forming a wall gap in the limiting rod and arranging an external protrusion.

[0020] In the technical scheme of the present application, the telescopic cylinder is fixedly connected to the inner wall of the bent frame by bolts, the pushing plate is clamped and fixed to the end of the driving rod of the telescopic cylinder, a limiting protrusion for limiting the rotation range of the turning plate is integrally formed at the bottom of the pushing plate located at the upper end, and the toothed plate is clamped and fixed to the outer wall of the pushing plate and engaged with the external gear.

[0021] When the pair of telescopic cylinders drives the pushing plate to move, the pushing plate at the bottom of the right side pushes the inner placing frame to move left, and the pushing plate at the top of the left side pushes the inner placing frame to move right, so that the positions of the placing frames on both sides are switched.

[0022] In the technical scheme of the present application, the chain disc is rotationally connected to the inner side wall of the fixed plate body, and the central shaft of the chain disc located at the upper end extends to the outside of the fixed plate body, and the two ends of the conveying frame are fixedly connected with the chain through a pin shaft.

[0023] In the technical scheme of the present application, the ratchet is fixedly connected to the end of the central shaft of the upper chain disc through a clamping pin, the ring teeth and the external gear are rotationally connected to the outer side wall of the fixed plate body, and the pawl is rotationally connected to the groove in the inner side wall of the ring teeth.

[0024] The above arrangement realizes the rotation of all the placing frames in the vertical position, eliminates the vertical temperature difference in the drying bin, and realizes uniform drying.

[0025] In the technical scheme of the present application, the protrusions are integrally formed at the bottom of the front and rear ends of the placing frame, the longitudinal section of the protrusion is in the shape of a Chinese character 'fang', the end of the insertion rod is inserted into the inside of the protrusion, the inside size of the protrusion is matched with the size of the square block at the end of the insertion rod, a wall gap is formed in the center of the protrusion, the sizes of the upper and lower protrusions of the protrusion are matched with the sizes of the insertion slots of the limiting rod, and the positions of the upper and lower protrusions of the protrusion are matched with the positions of the insertion slots of the limiting rod.

[0026] This setting is used to ensure the stability of the placement frame insertion by the convex strip, and the placement frame can be stably placed in the inside of the warehouse body by the cooperation of the insertion rod in the transportation device and the limiting rod.

[0027] In another aspect, the application also provides a multi-layer circulating hot air drying method for sea cucumber deep processing, which uses the above-mentioned multi-layer circulating hot air drying device for sea cucumber deep processing, and comprises the following steps:

[0028] S1, first, the operator inserts the placement frame loaded with sea cucumber into the inside of the warehouse body through the plate end opening on the fixed plate body, and ensures that the insertion rod in the transportation device is inserted into the inside of the convex strip in the placement frame;

[0029] S2, then, the operator closes the warehouse doors at the left and right ends of the drying warehouse, and opens the circulating fan to dry the sea cucumber in the inside of the drying warehouse;

[0030] S3, after the sea cucumber in the inside is dried for one day, a pair of telescopic cylinders are started to drive the movement of the push plates at the end of the driving rods, the push plate at the bottom of the right side pushes the inside placement frame to move left, and the push plate at the top of the left side pushes the inside placement frame to move right;

[0031] S4, then, the telescopic cylinder at the bottom of the right side drives the push plate to reset first, and the telescopic cylinder at the bottom of the left side drives the push plate to reset, in the process, when the top push plate is retracted, the tooth plates on both sides mesh with the driving ring teeth of the external gear;

[0032] S5, the several pawls on the inner wall of the ring teeth drive the one-way rotation of the ratchet wheel, the ratchet wheel is coaxially fixed with the chain disc, and the chain immediately pulls the transportation frame according to the fixed step distance;

[0033] S6, through the insertion rod inserted in the inside of the placement frame, the right side of the whole column of placement frames is driven to move down, and the left side of the whole column of placement frames is driven to move up, the vertical positions of all the placement frames are exchanged through the cyclic operation, the vertical temperature difference in the drying warehouse is eliminated, and uniform drying is realized;

[0034] S7, after the sea cucumber in the inside is dried, the circulating fan is turned off, the temperature in the inside is reduced, the warehouse door is opened, and the placement frame is taken out.

[0035] Compared with the prior art, the application has the following beneficial effects:

[0036] 1. The multi-layer circulating hot air drying device and method for sea cucumber deep processing, the several placement frames are distributed in the inside of the drying warehouse in a staggered manner, and can be forced to circulate through all temperature zones of the drying warehouse in the drying period under the cooperation of the push changing device and the transportation device, the vertical temperature difference caused by the upward surge of hot air is completely eliminated, and uniform drying is realized.

[0037] 2. In this multi-layer circulating hot air drying device and method for deep processing of sea cucumbers, when the telescopic cylinder on the top drives the push plate to perform the horizontal frame pushing action and reset, the external gear drive transmission group engaged by its toothed plate immediately drives the chain to pull the transport frame at a fixed step distance, thereby reducing the investment in additional drive devices, and eliminating the need to open the warehouse for cooling and manual intervention, realizing the rotation of the drying frame placement process, and ensuring the continuous operation of the circulating fan, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0040] Figure 3 It is a cutaway side view of the overall structure of the present invention;

[0041] Figure 4 This is a schematic cross-sectional view of the structure of the drying chamber in the present invention;

[0042] Figure 5 This is a partial structural diagram of the drying bin in the present invention;

[0043] Figure 6 Schematic diagram of the structure of the limiting rod in the present invention;

[0044] Figure 7 This is one of the structural diagrams of the push-switch device in the present invention;

[0045] Figure 8 For the present invention Figure 7 A magnified schematic diagram of part A;

[0046] Figure 9 This is the second structural diagram of the push-switch device in the present invention;

[0047] Figure 10 It is a structural schematic diagram of the transport device in the present invention;

[0048] Figure 11 Schematic diagram of the structure of the transmission group in the present invention;

[0049] Figure 12 It is a structural schematic diagram of the placement frame in the present invention;

[0050] Description of reference numerals:

[0051] 100, drying bin; 110, bin body; 120, circulating fan; 130, bending frame; 140, bin door; 150, inner partition plate; 151, fixed plate body; 1510, limiting sliding groove; 1511, plate end opening; 152, annular guide plate; 153, air guide grille; 160, limiting rod; 161, insertion slot; 162, limiting convex strip;

[0052] 200, pushing and changing device; 210, telescopic cylinder; 220, pushing plate; 230, turning plate; 240, toothed plate;

[0053] 300, conveying device; 310, chain disc; 320, chain; 330, conveying frame; 340, insertion rod; 350, transmission group; 351, ratchet wheel; 352, ring teeth; 353, pawl; 354, external gear;

[0054] 400, placing frame; 410, outer convex strip; 411, strip wall notch. DETAILED DESCRIPTION

[0055] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0056] Please refer to Figures 1-6 The technical solutions provided by the embodiments are shown as follows:

[0057] The multi-layer circulating hot air type drying device for deep processing of sea cucumbers comprises a drying bin 100, a pair of pushing and changing devices 200 arranged in a central symmetry inside the drying bin 100, a pair of conveying devices 300 arranged inside the drying bin 100, and a plurality of placing frames 400 conveyed by the conveying devices 300 and distributed in a staggered manner in two columns.

[0058] Specifically, the drying bin 100 further comprises a bin body 110 with openings at both ends, a plurality of circulating fans 120 fixedly connected to the outer walls of the bin body 110 at both ends through screws, four bending frames 130 welded and fixed to the inner walls of the openings at both ends of the bin body 110, a bin door 140 rotatably connected to the outside of the opening of the bin body 110 through a hinge, and a pair of inner partition plates 150 symmetrically arranged at both ends of the bin door 140.

[0059] Further, the inner partition plate 150 comprises a fixed plate body 151 welded and fixed to the inner wall of the bin body 110, an annular guide plate 152 fixedly connected to the center of the inner wall of the fixed plate body 151 through bolts, and a plurality of air guide grilles 153 clamped and fixed to the openings of the inner wall of the fixed plate body 151.

[0060] Further, the inner wall center of the fixed plate body 151 is welded with a bent plate with a concave cross section, the top of the fixed plate body 151 is provided with a front and rear through limiting sliding groove 1510, the left and right ends of the fixed plate body 151 are provided with a plurality of regularly distributed plate end openings 1511, and a through groove is formed on the bent plate of the inner wall of the fixed plate body 151, and the gap between the through groove and the annular guide plate 152 forms an annular guide rail.

[0061] Further, the drying bin 100 further comprises four limiting rods 160 fixedly connected to the inner wall of the fixed plate body 151, a plurality of groups of parallelly arranged insertion grooves 161 are formed on the outer wall of the limiting rod 160, limiting convex strips 162 are integrally formed on the upper and lower ends of the outer wall of the limiting rod 160, the upper limiting convex strip 162 is located above the topmost insertion groove 161, and the lower limiting convex strip 162 is located below the bottommost insertion groove 161.

[0062] Further, the bin body 110, the bent frame 130 and the bin door 140 are used to ensure the sealing of the internal environment of the drying bin 100, the circulating fan 120 is started to form a hot air circulation in the bin body 110, the bent frame 130 simultaneously provides a placement interval for the internal structure of the pushing and changing device 200, the limiting sliding groove 1510 of the inner fixed plate body 151 is used to limit the movement interval of the internal structure of the pushing and changing device 200, the plate end opening 1511 is used to limit the placement opening of the placement frame 400, and the annular guide plate 152 cooperates with the inner wall bent plate of the fixed plate body 151 to limit the movement interval in the conveying device 300. This setting is used to ensure the stability of the internal environment of the drying bin 100 and provides a prerequisite for the drying of sea cucumbers.

[0063] Further, the limiting rod 160 is used to limit the interval of the vertical movement of the placement frame 400 and ensure the stability of the vertical displacement, the insertion groove 161 is used to ensure the stability of the placement of the placement frame 400, and the limiting convex strip 162 is used to limit the movement interval of the bottommost end and the topmost end of the placement frame 400. This setting is achieved by forming a wall notch 411 on the limiting rod 160 and setting an outer convex strip 410 to ensure the stability of the placement of the placement frame 400 and the vertical movement.

[0064] Please refer to Figures 1-9 In the embodiment, the pushing and changing device 200 comprises a telescopic cylinder 210, a pushing plate 220 driven by the telescopic cylinder 210, and two tooth plates 240 located on the left and right sides of the upper pushing plate 220.

[0065] Specifically, the telescopic cylinder 210 is fixedly connected to the inner wall of the bent frame 130, and the pushing plate 220 is clamped and fixed to the end of the driving rod of the telescopic cylinder 210. The pushing plate 220 located at the top is integrally formed with a limiting convex strip at the bottom to limit the rotation range of the turning plate 230. The toothed plate 240 is clamped and fixed to the outer wall of the pushing plate 220 and is engaged with the external gear 354.

[0066] Further, the turning plate 230 at the bottom of the top pushing plate 220 can be rotated at will. In order to ensure that the pushing plate 220 can be reset, the bottom pushing plate 220 and the turning plate 230 at the top thereof are provided with a damper to ensure the pushing force of the turning plate 230. When the pushing plate 220 is driven to move by a pair of telescopic cylinders 210, the bottom pushing plate 220 on the right side pushes the inner placing frame 400 to move left, and the top pushing plate 220 on the left side pushes the inner placing frame 400 to move right, so as to realize the switching of the positions of the two placing frames 400.

[0067] Please refer to Figures 7-12 In the embodiment, the conveying device 300 includes two chain discs 310, a chain 320 sleeved outside the two chain discs 310, a plurality of conveying frames 330 regularly arranged on the chain 320, a plug rod 340 clamped at the end of the conveying frame 330, and a transmission set 350 arranged outside the top chain 320.

[0068] Specifically, the transmission set 350 includes a ratchet wheel 351, a ring tooth 352 sleeved outside the ratchet wheel 351, a plurality of ratchet claws 353 regularly arranged on the inner wall of the ring tooth 352, and an external gear 354 engaged above the ring tooth 352.

[0069] Further, the chain disc 310 is rotationally connected to the inner side wall of the fixed plate body 151, and the central shaft of the chain disc 310 located at the top extends to the outside of the fixed plate body 151. The two ends of the conveying frame 330 are fixedly connected with the chain 320 through a pin shaft.

[0070] Further, the ratchet wheel 351 is fixedly connected to the end of the central shaft of the chain disc 310 located at the top, the ring tooth 352 and the external gear 354 are rotationally connected to the outer side wall of the fixed plate body 151, and the ratchet claw 353 is rotationally connected to the groove in the inner side wall of the ring tooth 352.

[0071] Further, when the top pushing plate 220 is retracted, the gear plates 240 on both sides engage the external gear 354 to drive the ring teeth 352, the pawl 353 drives the ratchet wheel 351 to rotate in one direction, the ratchet wheel 351 is coaxially fixed with the chain disc 310, and the chain 320 drags the transport frame 330 by a fixed step, and drives the right whole set of placing frames 400 to move downward and the left whole set of placing frames 400 to move upward, so that the vertical positions of all the placing frames 400 are exchanged, the vertical temperature difference in the drying chamber is eliminated, and uniform drying is achieved.

[0072] Please refer to Figure 12 As shown in the figure, in the application, the front and rear ends of the placing frame 400 are integrally formed with external protrusions 410, the longitudinal section of the external protrusion 410 is in the shape of a Chinese character, the end of the insertion rod 340 is inserted into the inside of the external protrusion 410, the internal size of the external protrusion 410 is matched with the size of the square block at the end of the insertion rod 340, a strip wall notch 411 is formed at the center of the external protrusion 410, the size of the strip wall notch 411 is matched with the transverse section size of the limiting rod 160, and the upper and lower protrusions of the external protrusion 410 are matched with the size of the pair of insertion grooves 161 on the limiting rod 160.

[0073] Further, the placing frame 400 is used for placing sea cucumbers to be dried, the external protrusion 410 is used to ensure the stability of the placing frame 400 when being inserted, and the insertion rod 340 in the transport device 300 cooperates with the limiting rod 160 to enable the placing frame 400 to be stably placed in the inside of the chamber body 110.

[0074] The application also provides a multi-layer circulating hot air type drying method for deep processing of sea cucumbers, which uses the above-mentioned multi-layer circulating hot air type drying device for deep processing of sea cucumbers.

[0075] S1, first, the operator inserts the placing frame 400 loaded with sea cucumbers into the inside of the chamber body 110 through the plate end opening 1511 on the fixed plate body 151, and ensures that the insertion rod 340 in the transport device 300 is inserted into the inside of the external protrusion 410 of the placing frame 400;

[0076] S2, then, the operator closes the chamber doors 140 at both ends of the drying chamber 100, and opens the circulating fan 120 to dry the sea cucumbers in the drying chamber 100;

[0077] S3, after the sea cucumbers inside are dried for one day, the operator starts the pair of telescopic cylinders 210 to drive the pushing plate 220 at the end of the driving rod to move, the right bottom pushing plate 220 pushes the inside placing frame 400 to move left, and the left top pushing plate 220 pushes the inside placing frame 400 to move right;

[0078] S4, then, the right side of the bottom layer of telescopic cylinder 210 drive push plate 220 first reset, in the control of the left side of the bottom layer of telescopic cylinder 210 drive push plate 220 reset, in this process, the top push plate 220 shrink, its both sides of the gear plate 240 meshing external gear 354 drive ring gear 352;

[0079] S5, ring gear 352 inner wall on a number of pawl 353 drive ratchet 351 unidirectional rotation, ratchet 351 coaxial fixed chain plate 310, chain 320 immediately according to the fixed step traction transport frame 330;

[0080] S6, through the plug in the placement frame 400 inside the plug rod 340, drive the right side of the whole column placement frame 400 down, the left side of the whole column placement frame 400 up, the cyclic operation realizes all the placement frame 400 vertical position of the rotation, eliminate the vertical temperature difference in the drying chamber, realize uniform drying;

[0081] S7, then, after the completion of the drying of the inside of the sea cucumber, close the circulating fan 120, after the internal temperature decreases, open the door 140, the placement frame 400 can be taken out.

[0082] The foregoing description of specific exemplary embodiments of the present application is intended for purposes of illustration and example only. These descriptions are not intended to limit the application in any way, but to provide examples of the application. It will be apparent to one of ordinary skill in the art that many changes and modifications can be made to the specific embodiments described above without departing from the spirit and scope of the present application. The scope of the present application is not to be limited by the specific illustrative embodiments described above, but only by the claims.

Claims

1. A multi-layer circulating hot air drying device for deep processing of sea cucumbers, comprising a drying chamber (100), characterized in that: The drying bin (100) is provided with a pair of pushing and changing devices (200) arranged in a centrally symmetrical manner, a pair of transport devices (300) arranged inside the drying bin (100), and a plurality of placement frames (400) transported by the transport devices (300) and distributed in two rows and staggered layers on the left and right sides. The pushing and changing device (200) comprises a telescopic cylinder (210), a pushing plate (220) driven by the telescopic cylinder, and two tooth plates (240) located on both sides of the upper pushing plate (220). When the pair of telescopic cylinders (210) drives the pushing plates (220) to move, the pushing plate (220) on the bottom right side pushes the inner placement frame (400) to move leftward, and the pushing plate (220) on the top left side pushes the inner placement frame (400) to move rightward. The transport device (300) comprises two chain plates (310), a chain (320) sleeved on the outside of the two chain plates (310), a plurality of transport racks (330) regularly arranged on the chains (320), an insertion rod (340) clamped on the ends of the transport racks (330), and a transmission group (350) arranged outside the top chain (320); The transmission group (350) comprises a ratchet (351), a ring tooth (352) sleeved on the outside of the ratchet (351), a plurality of ratchet pawls (353) regularly arranged on the inner wall of the ring tooth (352), and an outer gear (354) meshing with the ring tooth (352); When the top push plate (220) is retracted, the tooth plates (240) on both sides thereof engage the outer gear (354) to drive the ring gear (352), and the ratchet (353) drives the ratchet (351) to rotate in one direction. The ratchet (351) is coaxially fixed to the chain plate (310), and the chain (320) then pulls the transport frame (330) at a fixed step distance, and drives the right-side whole column placement frame (400) to move down and the left-side whole column placement frame (400) to move up through the insertion rod (340) inserted into the placement frame (400). The cyclic operation realizes the rotation of the vertical position of all placement frames (400), eliminates the vertical temperature difference in the drying chamber, and achieves uniform drying.

2. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 1, characterized in that: The drying bin (100) further comprises a bin body (110) with openings at both left and right ends, a plurality of circulating fans (120) fixedly connected to the outer walls of the front and rear ends of the bin body (110) by screws, four bending frames (130) welded and fixed to the inner walls of the openings at the left and right ends of the bin body (110), a bin door (140) rotatably connected to the outer side of the opening of the bin body (110) by a hinge, and a pair of inner partitions (150) symmetrically arranged at the front and rear ends of the bin door (140).

3. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 2, characterized in that: The inner partition (150) comprises a fixed plate body (151) welded to the inner wall of the bin body (110), an annular guide plate (152) fixedly connected to the center of the inner wall of the fixed plate body (151) by bolts, and a plurality of air guide grilles (153) fixed to the openings of the inner wall of the fixed plate body (151).

4. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 3, characterized in that: At the center of the inner wall of the fixed plate body (151), a bent plate with a concave cross-section is welded. At the top position of the fixed plate body (151), a limiting sliding groove (1510) penetrating from front to back is provided. At the left and right ends of the fixed plate body (151), a number of regularly distributed plate-end openings (1511) are provided. On the bent plate of the inner wall of the fixed plate body (151), a through groove is provided, and the gap between the through groove and the annular guide plate (152) forms an annular guide rail.

5. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 4, characterized in that: The drying bin (100) further includes four limiting rods (160) bolted and fixed to the inner wall of the fixed plate body (151). On the outer wall of the limiting rods (160), a number of groups of parallel slots (161) are provided. On the upper and lower outer walls of the limiting rods (160), limiting ridges (162) are integrally formed. The upper limiting ridge (162) is located above the topmost slot (161), and the lower limiting ridge (162) is located below the bottommost slot (161).

6. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 5, characterized in that: The telescopic cylinder (210) is bolted and fixed to the inner wall of the bent frame (130), and the pushing plate (220) is snap-fitted and fixed to the end of the driving rod of the telescopic cylinder (210). On the bottom of the upper pushing plate (220), a limiting ridge for restricting the rotation range of the flap (230) is integrally formed. The toothed plate (240) is snap-fitted and fixed to the outer wall of the pushing plate (220) and meshes with the external gear (354).

7. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 6, characterized in that: The chain disc (310) is rotatably connected to the inner side wall of the fixed plate body (151). The central axis of the upper chain disc (310) extends to the outside of the fixed plate body (151). The two ends of the transport rack (330) are fixedly connected to the chain (320) through pin shafts.

8. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 7, characterized in that: The ratchet wheel (351) is fixedly connected to the end of the central axis of the upper chain disc (310) through a retaining pin. The ring gear (352) and the external gear (354) are both rotatably connected to the outer side wall of the fixed plate body (151). The ratchet pawl (353) is rotatably connected to the groove on the inner circumferential wall of the ring gear (352).

9. The multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 8, characterized in that: At the front and rear bottom ends of the placement frame (400), external ridges (410) are integrally formed. The longitudinal cross-section of the external ridges (410) is in a U shape. The end of the insertion rod (340) is inserted into the inside of the external ridges (410), and its internal dimensions are adapted to the dimensions of the square at the end of the insertion rod (340). At the central position of the external ridges (410), a strip-wall notch (411) adapted to the transverse cross-section dimensions of the limiting rod (160) is provided. The upper and lower ridges of the external ridges (410) correspond to a pair of slots (161) on the limiting rod (160) in position and are adapted in dimensions.

10. A multi-layer circulating hot air drying method for deep processing of sea cucumbers, using the multi-layer circulating hot air drying device for deep processing of sea cucumbers according to claim 9, characterized in that: Including the following steps: S1. First, the operator inserts the placement frame (400) loaded with sea cucumbers into the inside of the bin body (110) through the plate-end opening (1511) on the fixed plate body (151), and ensures that the insertion rod (340) in the transport device (300) is inserted into the inside of the external ridges (410) on the placement frame (400); S2. Then, the operator closes the doors (140) at the left and right ends of the drying chamber (100) and turns on the circulating fan (120) to dry the sea cucumbers inside the drying chamber (100); S3, after the sea cucumber inside is dried for a day, a pair of telescopic cylinders (210) are started to drive the push plates (220) at the ends of the drive rods thereof to move, the push plates (220) on the bottom right side push the inner placement frame (400) to move left, and the push plates (220) on the top left side push the inner placement frame (400) to move right; S4. Subsequently, the telescopic cylinder (210) on the right bottom layer drives the push plate (220) to reset first, and then controls the telescopic cylinder (210) on the left bottom layer to drive the push plate (220) to reset. During this process, when the top push plate (220) contracts, the tooth plates (240) on both sides thereof engage the external gear (354) to drive the ring gear (352); S5, a plurality of ratchet pawls (353) on the inner wall of the ring gear (352) drive the ratchet (351) to rotate in one direction, the ratchet (351) is coaxially fixed to the chain plate (310), and the chain (320) then pulls the transport frame (330) at a fixed step distance; S6, by inserting the rod (340) inside the placement frame (400), the entire row of placement frames (400) on the right side are driven to move downward, and the entire row of placement frames (400) on the left side are driven to move upward, and the cyclic operation realizes the rotation of the vertical positions of all placement frames (400), eliminates the vertical temperature difference in the drying chamber, and realizes uniform drying; S7. After that, when the sea cucumber inside is completely dried, the circulating fan (120) is turned off, and when the internal temperature drops, the door (140) is opened and the placement frame (400) is taken out.

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