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

Abstract

The invention relates to the technical field of seafood processing, in particular to a multilayer circulating hot air type drying device for sea cucumber deep processing and a method of the multilayer circulating hot air type drying device. The drying bin is internally provided with a pair of pushing and replacing devices arranged in a central symmetry mode, a pair of conveying devices arranged in the drying bin and a plurality of containing frames which are conveyed by the conveying devices and distributed in a left-right two-row staggered layer mode. According to the multi-layer circulating hot air type drying device for sea cucumber deep processing and the method thereof, the multiple placing frames are distributed in the drying bin in a staggered mode, all the placing frames can be forced to circularly penetrate through all the temperature areas of the drying bin in the drying period under the cooperation of the pushing and replacing device and the conveying device, the vertical temperature difference caused by hot air upwelling is thoroughly eliminated, and uniform drying is achieved.

Description

Technical Field

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

[0002] The multi-layer circulating hot air seafood drying device adopts a three-dimensional layered structure, combined with an efficient hot air circulation system, to achieve precise temperature control and drying of seafood deep processing. The equipment has a built-in multi-layer mesh belt conveyor and cooperates with uniform air supply technology to ensure that materials such as fish fillets, shrimps, and sea cucumbers are heated evenly, quickly dehydrated while locking in nutrients and freshness. It is suitable for large-scale seafood processing companies and can improve drying efficiency and product quality.

[0003] Patent application number CN202120885779.5 discloses a cold air drying device for seafood mushroom production and processing, including a body and a control panel. The control panel is installed on the outer wall of the body, and a wire harness mechanism is installed on the outer wall of the body. The internal gap of the shell is matched with bolts, and the outer walls of the two bolts pass through the shell and are threadedly connected to the body. The inner cavity of the shell is fixed with a connecting rod. The cold air drying device for seafood mushroom production and processing, through the coordinated use of the shell, bolts, connecting rods, sheaves, nuts and cover plates, the sheaves twist the excessively long wires to prevent the wires from tripping the workers, which is conducive to wiring.

[0004] However, traditional drying warehouses all use a fixed shelf structure, and the placement frames are stacked statically. However, the hot air naturally rises and falls, resulting in high temperature at the top and high humidity at the bottom. The position of the sea cucumbers cannot be dynamically adjusted, resulting in uneven heating and inconsistent drying of the sea cucumbers, which in turn affects product quality. The sea cucumbers on the top layer are prone to overdrying and cracking, while the sea cucumbers on the bottom layer are not fully dried. In order to balance the temperature and humidity, the traditional method is to shut down and open the warehouse when rotating materials, and manually transfer them. This not only interrupts the drying process and increases energy consumption, but also easily causes heat loss and reduces efficiency. Existing equipment may require additional motors or drive devices to achieve movement, which is complex in structure and costly.

[0005] In view of this, we propose a multi-layer circulating hot air drying device and method for deep processing of sea cucumbers. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-layer circulating hot air drying device and method for deep processing of sea cucumbers, which drives the push plate through a telescopic cylinder to perform a bidirectional horizontal frame pushing action, and cooperates with a transportation device to solve the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: A multi-layer circulating hot air type drying device for deep processing of sea cucumbers comprises a drying chamber, wherein a pair of pushing and changing devices arranged symmetrically in the center of the drying chamber are provided inside the drying chamber, a pair of transporting devices arranged inside the drying chamber, and a plurality of placing frames transported by the transporting devices and arranged in two rows and staggered layers on the left and right sides; The pushing and changing device includes a telescopic cylinder, a pushing plate driven by the cylinder, and two tooth plates located on both sides of the upper pushing plate; In this setting, when a pair of telescopic cylinders drive the push plates to move, the push plate on the bottom right side pushes the inner placement frame to the left, and the push plate on the top left side pushes the inner placement frame to the right; The transport device includes two chain plates, chains sleeved on the outside of the two chain plates, a number of transport racks regularly arranged on the chains, an insertion rod clamped on the ends of the transport racks, and a transmission group arranged outside the top chain; The transmission group includes a ratchet, a ring gear sleeved on the outside of the ratchet, a plurality of pawls regularly arranged on the inner wall of the ring gear, and an external gear meshed with the ring gear; When the top push plate of the above-mentioned arrangement retracts, the tooth plates on both sides thereof engage with the outer gear driving ring teeth, and the pawl drives the ratchet to rotate in one direction. The ratchet is coaxially fixed to the chain plate, and the chain then pulls the transport frame at a fixed step distance, and drives the entire row of placement frames on the right to move down and the entire row of placement frames on the left to move up through the insertion rod inserted into the placement frame. The cyclic operation realizes the rotation of the vertical positions of all placement frames, eliminates the vertical temperature difference in the drying chamber, and achieves uniform drying.

[0008] In the technical solution of the present invention, the drying bin also includes a bin body with openings at both ends, a number of circulation fans fixedly connected to the outer walls of the front and rear ends of the bin body by screws, four bending frames welded and fixed to the inner walls of the openings at the left and right ends of the bin body, a bin door connected to the outer side of the opening of the bin body by hinges, and a pair of inner partitions symmetrically arranged at the front and rear ends of the bin door.

[0009] In the technical solution of the present invention, the inner partition includes a fixed plate body welded to the inner wall of the warehouse body, an annular guide plate fixedly connected to the center of the inner wall of the fixed plate body by bolts, and several air guide grilles clamped and fixed at the openings of the inner wall of the fixed plate body.

[0010] In the technical solution of the present invention, a bent plate with a concave cross-section is welded at the center of the inner wall of the fixed plate body, a limiting sliding groove running through the front and back is opened at the top position of the fixed plate body, a number of regularly distributed plate end openings are opened at the left and right ends of the fixed plate body, and a through groove is opened on the bent plate on the inner wall of the fixed plate body, and the gap between the through groove and the annular guide plate forms an annular guide rail.

[0011] The above settings are used to ensure the stability of the internal environment of the drying chamber, providing the prerequisite for drying sea cucumbers.

[0012] In the technical solution of the present invention, the drying bin further includes four limiting rods fixedly connected to the inner wall of the fixing plate body by bolts. A plurality of groups of parallel slots are provided on the outer wall of the limiting rods. Limiting ridges are integrally formed on the outer walls of the upper and lower ends of the limiting rods. The upper limiting ridge is located above the topmost slot, and the lower limiting ridge is located below the bottommost slot.

[0013] This setting ensures the stability of the placement frame when it is placed and vertically moved by providing a strip wall notch on the limiting rod and an outward convex strip.

[0014] In the technical solution of the present invention, the telescopic cylinder is fixedly connected to the inner wall of the bent frame by bolts, and the push plate is snap-fitted to the end of the driving rod of the telescopic cylinder. A limiting ridge for restricting the rotation range of the turning plate is integrally formed at the bottom of the upper push plate. The toothed plate is snap-fitted to the outer wall of the push plate and meshes with the external gear.

[0015] When this setting drives the push plate to move through a pair of telescopic cylinders, the push plate at the bottom layer on the right side pushes the inner placement frame to move left, and the push plate at the top layer on the left side pushes the inner placement frame to move right, realizing the switching of the positions of the placement frames on both sides.

[0016] In the technical solution of the present invention, the chain disc is rotatably connected to the inner side wall of the fixing plate body, and the central axis of the upper chain disc extends to the outside of the fixing plate body. Both ends of the transport rack are fixedly connected to the chain by pin shafts.

[0017] In the technical solution of the present invention, the ratchet wheel is fixedly connected to the end of the central axis of the upper chain disc by a retaining pin. Both the ring gear and the external gear are rotatably connected to the outer side wall of the fixing plate body. The ratchet pawl is rotatably connected to the groove on the inner circumferential wall of the ring gear.

[0018] The above setting realizes the rotation of the vertical positions of all placement frames through cyclic operation, eliminates the vertical temperature difference in the drying bin, and realizes uniform drying.

[0019] In the technical solution of the present invention, outward convex strips are integrally formed at the bottom of the front and rear ends of the placement frame. The longitudinal section of the outward convex strip is in a U shape. The end of the insertion rod is inserted into the inside of the outward convex strip, and its internal dimension is adapted to the size of the square at the end of the insertion rod. A strip wall notch adapted to the transverse section dimension of the limiting rod is provided at the central position of the outward convex strip. The upper and lower convex strips of the outward convex strip correspond to the positions of a pair of slots on the limiting rod and have matching dimensions.

[0020] This setting uses the outward convex strip to ensure the stability of the placement frame when it is inserted, and through the cooperation of the insertion rod in the transport device and the limiting rod, the placement frame can be stably placed inside the bin body.

[0021] On the other hand, the present invention also provides a multi-layer circulating hot air type drying method for deep processing of sea cucumbers, using the above-mentioned multi-layer circulating hot air type drying device for deep processing of sea cucumbers, comprising the following steps: S1. First, the operator inserts the placement frame loaded with sea cucumbers into the interior of the warehouse body through the plate end opening on the fixed plate body, and ensures that the insertion rod in the transport device is inserted into the interior of the outer convex strip of the placement frame; S2, then, the operating personnel close the door at the left and right ends of the drying warehouse, and open the circulating fan, and carry out drying operation to the sea cucumber in the drying warehouse inside; S3, treat that the sea cucumber of inside is dried to one-day cycle, start a pair of telescopic cylinders and drive the push plate motion of its driving rod end, the push plate of right bottom promotes the inboard placement frame to move left, the left top push plate promotes the inboard placement frame to move right; S4. Subsequently, the telescopic cylinder on the right bottom layer drives the push plate to reset first, and then controls the telescopic cylinder on the left bottom layer to drive the push plate to reset. During this process, when the top push plate retracts, the toothed plates on both sides thereof engage with the outer gear drive ring gear; S5. Several pawls on the inner wall of the ring teeth drive the ratchet to rotate in one direction. The ratchet is coaxially fixed to the chain plate, and the chain then pulls the transport frame at a fixed step distance. S6. By inserting the rods inside the placement frames, the entire row of placement frames on the right side is driven to move down, and the entire row of placement frames on the left side is driven to move up. The cyclic operation realizes the rotation of the vertical positions of all placement frames, thereby eliminating the vertical temperature difference in the drying chamber and achieving uniform drying. S7. After that, when the sea cucumbers inside are completely dried, turn off the circulating fan, wait until the internal temperature drops, open the door, and take out the placement frame.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. This multi-layer circulating hot air type drying device and method for deep processing of sea cucumbers has several placement frames distributed in staggered layers inside the drying bin. With the cooperation of the pushing and changing device and the transport device, all the placement frames are forced to circulate through the various temperature zones of the drying bin during the drying cycle, completely eliminating the vertical temperature difference caused by the upwelling of hot air and achieving uniform drying.

[0023] 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

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 It is a cutaway side view of the overall structure of the present invention; Figure 4 This is a schematic cross-sectional view of the structure of the drying chamber in the present invention; Figure 5 This is a partial structural diagram of the drying bin in the present invention; Figure 6 Schematic diagram of the structure of the limiting rod in the present invention; Figure 7 This is one of the structural diagrams of the push-switch device in the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of part A; Figure 9 This is the second structural diagram of the push-switch device in the present invention; Figure 10 It is a structural schematic diagram of the transport device in the present invention; Figure 11 Schematic diagram of the structure of the transmission group in the present invention; Figure 12 It is a structural schematic diagram of the placement frame in the present invention; Description of reference numerals: 100, drying chamber; 110, chamber body; 120, circulating fan; 130, bending frame; 140, chamber door; 150, inner partition; 151, fixed plate; 1510, limiting slide; 1511, plate end opening; 152, annular guide plate; 153, air guide grille; 160, limiting rod; 161, slot; 162, limiting ridge; 200, push-change device; 210, telescopic cylinder; 220, push plate; 230, flap; 240, tooth plate; 300, transport device; 310, chain plate; 320, chain; 330, transport frame; 340, insertion rod; 350, transmission group; 351, ratchet; 352, ring gear; 353, pawl; 354, external gear; 400, placement frame; 410, outer convex strip; 411, strip wall notch. DETAILED DESCRIPTION

[0025] The following will provide a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] See also Figures 1-6As shown, this embodiment provides a technical solution: A multi-layer circulating hot air drying device for deep processing of sea cucumbers includes a drying chamber 100, a pair of centrally symmetrically arranged pushing and changing devices 200, a pair of transport devices 300 arranged inside the drying chamber 100, and a plurality of placement frames 400 transported by the transport devices 300 and staggered in left and right rows; Specifically, the drying bin 100 also includes a bin body 110 with openings at both ends, a number of circulation 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 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.

[0027] Furthermore, the inner partition 150 includes a fixed plate body 151 welded to the inner wall of the warehouse 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 clipped and fixed to the openings of the inner wall of the fixed plate body 151.

[0028] Furthermore, a bent plate with a concave cross-section is welded at the center of the inner wall of the fixed plate body 151, a front-to-back limiting slide groove 1510 is provided at the top of the fixed plate body 151, a number of regularly distributed plate end openings 1511 are provided at the left and right ends of the fixed plate body 151, and a through groove is provided on the bent plate on 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.

[0029] Furthermore, the drying chamber 100 also includes a limit rod 160 fixedly connected to the inner wall of the fixed plate 151 by four bolts, and a plurality of groups of parallel slots 161 are opened on the outer wall of the limit rod 160. The limit ridges 162 are integrally formed on the upper and lower outer walls of the limit rod 160. The upper limit ridge 162 is located above the top slot 161, and the lower limit ridge 162 is located below the bottom slot 161.

[0030] Furthermore, the bin body 110, the bending frame 130 and the bin door 140 are used to ensure the sealing of the internal environment of the drying bin 100. After the circulating fan 120 is started, it is used to form a hot air circulation inside the bin body 110. The bending frame 130 also provides a placement interval for the internal structure of the pushing and changing device 200. The limiting slide groove 1510 of the fixed plate body 151 in the inner partition 150 is used to limit the moving interval of the internal structure of the pushing and changing device 200, and the plate end opening 1511 is used to limit the placement opening of the placement frame 400. The annular guide plate 152 cooperates with the inner wall bending plate of the fixed plate body 151 to limit the moving interval in the transportation device 300. This setting is used to ensure the stability of the internal environment of the drying bin 100 and provide the prerequisite for drying sea cucumbers.

[0031] Furthermore, the limit rod 160 is used to limit the range of vertical movement of the placement frame 400 to ensure stability during vertical displacement. The slot 161 is used to ensure the stability of the placement frame 400 when it is placed. The limit ridge 162 is used to limit the movement range of the bottom and top ends of the placement frame 400. This setting ensures the stability of the placement frame 400 when it is placed and when it moves vertically by opening a wall notch 411 and setting an outer ridge 410 on the limit rod 160.

[0032] See also Figures 1-9 As shown, in this embodiment, the pushing and changing device 200 includes a telescopic cylinder 210 , a pushing plate 220 driven by the cylinder, and two tooth plates 240 located on both sides of the upper pushing plate 220 .

[0033] Specifically, the telescopic cylinder 210 is fixedly connected to the inner wall of the bending frame 130 by bolts, and the pushing plate 220 is clamped and fixed to the end of the driving rod of the telescopic cylinder 210. The bottom of the pushing plate 220 located above is integrally formed with a limiting ridge that limits the rotation range of the flap 230. The tooth plate 240 is clamped and fixed to the outer wall of the pushing plate 220 and engages with the external gear 354.

[0034] Furthermore, the flip plate 230 at the bottom of the top push plate 220 can be rotated at will. In order to ensure that the push plate 220 can be reset and prevent the fixed plate body from driving the placement frame 400 back to its original position, a damping is provided between the bottom push plate 220 and the flip plate 230 at its top to ensure the thrust of the flip plate 230. This setting drives the push plate 220 to move through a pair of telescopic cylinders 210. The push plate 220 on the right bottom layer pushes the inner placement frame 400 to move left, and the top push plate 220 on the left side pushes the inner placement frame 400 to move right, thereby realizing the switching of the positions of the placement frames 400 on both sides.

[0035] See also Figure 7-12As shown in the figure, in this embodiment, the transportation device 300 includes two chain wheels 310, a chain 320 sleeved outside the two chain wheels 310, a number of transportation frames 330 regularly arranged on the chain 320, a plug rod 340 clamped at the end of the transportation frame 330, and a transmission group 350 arranged outside the top chain 320.

[0036] Specifically, the transmission group 350 includes a ratchet wheel 351, a ring gear 352 sleeved outside the ratchet wheel 351, a number of pawls 353 regularly arranged on the inner wall of the ring gear 352, and an external gear 354 meshing above the ring gear 352.

[0037] Furthermore, the chain wheel 310 is rotatably connected to the inner side wall of the fixed plate body 151, and the central axis of the upper chain wheel 310 extends to the outside of the fixed plate body 151. Both ends of the transportation frame 330 are fixedly connected to the chain 320 through pin shafts.

[0038] Furthermore, the ratchet wheel 351 is fixedly connected to the end of the central axis of the upper chain wheel 310 through a snap pin. Both the ring gear 352 and the external gear 354 are rotatably connected to the outer side wall of the fixed plate body 151. The pawl 353 is rotatably connected to the groove on the inner ring wall of the ring gear 352.

[0039] Furthermore, when the top push plate 220 contracts, the toothed plates 240 on both sides thereof mesh with the external gear 354 to drive the ring gear 352. The ratchet wheel 351 is driven to rotate unidirectionally by the pawl 353. The ratchet wheel 351 is coaxially and fixedly connected to the chain wheel 310. The chain 320 then traction the transportation frame 330 at a fixed step distance, and through the plug rod 340 inserted inside the placement frame 400, the entire row of placement frames 400 on the right side is driven to move downward, and the entire row of placement frames 400 on the left side is driven to move upward. This setting operates cyclically to realize the rotation of the vertical positions of all the placement frames 400, eliminate the vertical temperature difference in the drying bin, and achieve uniform drying.

[0040] Please refer to Figure 12 As shown in the figure, in the present invention, external convex strips 410 are integrally formed at the bottoms of the front and rear ends of the placement frame 400. The longitudinal cross-section of the external convex strip 410 is in a U shape. The end of the plug rod 340 is inserted inside the external convex strip 410, and its internal dimension is adapted to the square dimension of the end of the plug rod 340. A strip wall notch 411 adapted to the transverse cross-section dimension of the limiting rod 160 is provided at the central position of the external convex strip 410. The upper and lower convex strips of the external convex strip 410 correspond to the positions of a pair of slots 161 on the limiting rod 160 and have adapted dimensions.

[0041] Furthermore, the placement frame 400 is used to place the sea cucumbers to be dried. This setting ensures the stability of the placement frame 400 during insertion through the external convex strip 410, and through the cooperation of the plug rod 340 and the limiting rod 160 in the transportation device 300, the placement frame 400 can be stably placed inside the bin body 110.

[0042] The present invention 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. When used, it includes the following steps: S1. First, the operator inserts the placement frame 400 loaded with sea cucumbers into the interior of the warehouse body 110 through the plate end opening 1511 on the fixed plate body 151, and ensures that the insertion rod 340 in the transportation device 300 is inserted into the interior of the outer protrusion 410 of the placement frame 400; S2. Then, the operator closes the doors 140 at the left and right ends of the drying bin 100 and turns on the circulating fan 120 to dry the sea cucumbers inside the drying bin 100; S3, after the internal sea cucumber is dried to a day cycle, a pair of telescopic cylinders 210 are started to drive the push plate 220 at the end of the drive rod to move, and the push plate 220 on the right bottom pushes the inner placement frame 400 to move left, and the left top push plate 220 pushes 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 retracts, the toothed plates 240 on both sides thereof engage the outer gear 354 to drive the ring gear 352; S5. The ratchet 351 is driven by the ratchet 353 on the inner wall of the ring gear 352 to rotate in one direction. The ratchet 351 is coaxially fixed to the chain plate 310. The chain 320 then pulls the transport frame 330 at a fixed pitch. S6. By inserting the rod 340 inside the placement frame 400, the entire row of placement frames 400 on the right side is driven to move downward, and the entire row of placement frames 400 on the left side is driven to move upward. The cyclic operation realizes the rotation of the vertical positions of all placement frames 400, thereby eliminating the vertical temperature difference in the drying chamber and achieving 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.

[0043] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to make and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the description and its equivalents.

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) fixedly connected to the inner wall of the fixed plate body (151) by bolts. 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 fixedly connected to the inner wall of the bent frame (130) by bolts, and the pushing plate (220) is clamped 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 clamped 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) by 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) by 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 pawl (353) is rotatably connected to the groove on the inner annular 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: On the front and rear bottom ends of the placement frame (400), outer ridges (410) are integrally formed. The longitudinal cross-section of the outer ridges (410) is in a U shape. The end of the insertion rod (340) is inserted into the inside of the outer ridges (410), and its internal dimension is adapted to the dimension of the square at the end of the insertion rod (340). At the central position of the outer ridges (410), a strip wall notch (411) adapted to the transverse cross-section dimension of the limiting rod (160) is provided. The upper and lower two ridges of the outer ridges (410) correspond to a pair of slots (161) on the limiting rod (160) in position and are adapted in dimension.

10. A multi-layer circulating hot air type drying method for deep processing of sea cucumbers, using the multi-layer circulating hot air type 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 outer 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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