A freeze-drying production device using liquid nitrogen

Abstract

The utility model discloses a freeze-drying production device of using liquid nitrogen granulation, include: base, rotating platform, drip mechanism and discharge mechanism. Drip mechanism installs on the side wall of control platform. The discharge mechanism is installed on the rotating platform, and the discharge mechanism includes: lifter, first rotary ring, second rotary ring, a plurality of fishing net and a plurality of inverted U shape support arm. Lifter is installed on the base, and is located in the center of rotating platform. The first rotary ring rotates in the top of lifter, and the second rotary ring rotates and slides on the lifter, and the first rotary ring is located in the second rotary ring. A plurality of Z-shaped support arms are fixed on the side wall of the first rotary ring, a plurality of pairs of L-shaped control arms are fixed on the side wall of the second rotary ring, and a plurality of Z-shaped support arms are respectively arranged between each pair of L-shaped control arms. The utility model discloses a freeze-drying production device of using liquid nitrogen granulation, through the relevant structure design, can automatically add into the westlin bottle after the ice bead that freezes completely is fished out from liquid nitrogen, effectively improves the processing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of freeze-drying production technology, specifically relating to a freeze-drying production device that uses liquid nitrogen for granulation. Background Technology

[0002] Liquid nitrogen granulation freeze-drying equipment is an advanced production method combining rapid freezing and freeze-drying technologies with liquid nitrogen, widely used in fields such as biology, pharmaceuticals, food, and chemicals. Its core function is to utilize the ultra-low temperature properties of liquid nitrogen to drop liquid or semi-solid materials into it, then rapidly freeze them into bead-like particles. These frozen ice balls are then transferred to vials, which are subsequently transferred to a freeze dryer for freeze-drying.

[0003] Currently, ice balls are frozen using liquid nitrogen, but they still need to be manually transferred to vials. This process is not only inefficient, but the ice balls also thaw slightly when exposed to air for an extended period, which affects the final freeze-drying effect of the product.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a freeze-drying production apparatus that uses liquid nitrogen for granulation.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a freeze-drying production device that uses liquid nitrogen for granulation, which can solve the problem that existing quick-frozen ice balls still need to be manually transferred into vials.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A freeze-drying production apparatus using liquid nitrogen granulation includes: a base, a rotating table, a dripping mechanism, and a discharge mechanism.

[0009] A control console is provided on one side of the top of the base. The rotating platform rotates on the base, and multiple cup slots are carved into the rotating platform. Each cup slot contains a liquid nitrogen cup, and bottle slots are provided on the outer side of each cup slot. The dripping mechanism is installed on the side wall of the control console.

[0010] The discharge mechanism is mounted on a rotating platform and includes: a lifting rod, a first rotating ring, a second rotating ring, multiple retrieval nets, and multiple inverted U-shaped support arms. The lifting rod is mounted on a base and located at the center of the rotating platform. The first rotating ring rotates at the top of the lifting rod, and the second rotating ring rotates and slides on the lifting rod, with the first rotating ring located inside the second rotating ring. Multiple Z-shaped support arms are fixed to the side wall of the first rotating ring, and multiple pairs of L-shaped control arms are fixed to the side wall of the second rotating ring, with the Z-shaped support arms positioned between each pair of L-shaped control arms. The multiple retrieval nets rotate at the ends of the multiple pairs of L-shaped control arms away from the second rotating ring and are respectively located within multiple liquid nitrogen cups. A discharge port is cut at the top of each retrieval net. One end of each inverted U-shaped support arm is fixed to one of the multiple retrieval nets, and the other end slides on the ends of the multiple Z-shaped support arms away from the first rotating ring. A limit-positioning push assembly is provided between the second rotating ring and the lifting rod.

[0011] In one embodiment of this utility model, the dripping mechanism includes an L-shaped support arm and a dripping element. The L-shaped support arm slides on the side wall of the control console. The dripping element is installed at the end of the L-shaped support arm away from the control console and is located at the top of one of the cups. When dripping is required, the L-shaped support arm is pushed to move the dripping element to the top of the cup closest to the control console.

[0012] In one embodiment of this utility model, a slide rail is fixed on the side wall of the control console, and a movable component is slidably disposed on the slide rail. The end of the L-shaped support arm near the control console is fixed to the movable component. The L-shaped support arm slides on the slide rail via the movable component, thereby sliding on the side wall of the control console.

[0013] In one embodiment of this utility model, each of the plurality of Z-shaped support arms has a groove at its end away from the first rotating ring, and the end of the inverted U-shaped support arm near the groove slides on the groove. Each pair of the plurality of inverted U-shaped support arms near the groove is equipped with a pulley, which slides within the groove. When the first rotating ring drives the Z-shaped support arms to move relative to each other, the end of the Z-shaped support arm near the inverted U-shaped support arm drives the fishing net to rotate. When the inverted U-shaped support arm rotates, the end of the inverted U-shaped support arm near the pulley moves not only vertically but also horizontally, thus causing the pulley to slide within the groove.

[0014] In one embodiment of this utility model, the limiting and pushing assembly includes: a fixed ring, a spring, and a limiting module. The fixed ring is fixed to the lifting rod. The spring is installed between the fixed ring and the second rotating ring and is sleeved on the lifting rod. The limiting module is installed on the second rotating ring. When the lifting rod begins to move upward, the fixed ring and the spring drive the second rotating ring and the first rotating ring to move upward together. When the second rotating ring moves the retrieval net out of the liquid nitrogen cup via the L-shaped control arm, the limiting module stops the second rotating ring from moving upward. At this time, the lifting rod continues to move downward, only driving the first rotating ring to move upward, and the fixed ring compresses the spring, so that the spring's counterforce pushes the second rotating ring upward tightly, preventing the second rotating ring from shaking.

[0015] In one embodiment of this utility model, the limiting module includes: a pair of extension rods, a pair of limiting blocks, and a pair of limiting grooves. The pair of extension rods are both fixed to the bottom of the second rotating ring and are located on both sides of the second rotating ring. The pair of limiting blocks are respectively fixed to the ends of the pair of extension rods away from the second rotating ring. The pair of limiting grooves are respectively carved into the inner wall of the rotating platform, and the pair of limiting blocks slide within the pair of limiting grooves. When the lifting rod drives the second rotating ring upward through the fixing ring and spring, the second rotating ring drives the limiting blocks to slide upward in the limiting grooves through the extension rods. When the limiting blocks slide to the top wall of the limiting grooves, the second rotating ring stops moving upward.

[0016] In one embodiment of this utility model, the side of the retrieval net away from the inverted U-shaped support arm is provided with an inclined surface. The inclined surface is used so that when the retrieval net rotates, the ice beads inside the retrieval net slide along the inclined surface to the discharge port.

[0017] In one embodiment of this utility model, an inclined baffle is provided at one end of the retrieval net near the discharge port. The inclined baffle is used to block the ice beads and prevent them from sliding directly out of the end of the retrieval net near the discharge port when they slide down the inclined surface.

[0018] In one embodiment of this utility model, the end of the inverted U-shaped support arm near the sliding groove is longer than the end of the inverted U-shaped support arm near the retrieval net. By making the end of the inverted U-shaped support arm near the sliding groove longer than the end of the inverted U-shaped support arm near the retrieval net, the inverted U-shaped support arm can more easily drive the retrieval net to rotate.

[0019] Compared with the prior art, the freeze-drying production device of this utility model using liquid nitrogen granulation can automatically remove the frozen ice beads from the liquid nitrogen and add them into the vial through related structural design, which effectively improves the processing efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a freeze-drying production apparatus using liquid nitrogen granulation in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the base and the rotating platform in one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the material discharge mechanism in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the discharge mechanism in another state according to one embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the retrieval net and the inverted U-shaped support arm in one embodiment of the present invention.

[0026] Explanation of key figure labels:

[0027] 1-Base, 101-Rotating table, 102-Control console, 103-Cup tank, 104-Bottle tank, 105-Liquid nitrogen cup, 106-Slide rail, 107-Moving component, 108-L-shaped support arm, 109-Dispensing component, 2-Discharge mechanism, 201-Lifting rod, 202-First rotating ring, 203-Z-shaped support arm, 204-Slide groove, 205-Second rotating ring, 206-L-shaped control arm, 207-Retrieving net, 208-Inverted U-shaped support arm, 209-Discharge port, 210-Inclined surface, 211-Pulley, 212-Fixing ring, 213-Spring, 214-Extension rod, 215-Limiting block, 216-Limiting slide groove, 217-Inclined baffle. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0029] like Figure 1-5As shown, a freeze-drying production device using liquid nitrogen granulation in one embodiment of the present invention includes: a base 1, a rotating table 101, a dripping mechanism, and a discharge mechanism 2.

[0030] like Figure 1-5 As shown, a control console 102 is provided on one side of the top of the base 1. A rotating platform 101 rotates on the base 1. Multiple cup slots 103 are carved into the rotating platform 101, and liquid nitrogen cups 105 are installed in each cup slot 103. Bottle slots 104 are provided on the outer side of each cup slot 103. A dripping mechanism is installed on the side wall of the control console 102.

[0031] like Figure 1-5 As shown, the discharge mechanism 2 is mounted on the rotary table 101. The discharge mechanism 2 includes: a lifting rod 201, a first rotating ring 202, a second rotating ring 205, multiple retrieval nets 207, and multiple inverted U-shaped support arms 208. The lifting rod 201 is mounted on the base 1 and is located at the center of the rotary table 101. The first rotating ring 202 rotates at the top of the lifting rod 201, and the second rotating ring 205 rotates and slides on the lifting rod 201, with the first rotating ring 202 located inside the second rotating ring 205. Multiple Z-shaped support arms 203 are fixed to the side wall of the first rotating ring 202, and multiple pairs of L-shaped control arms 206 are fixed to the side wall of the second rotating ring 205, with the multiple Z-shaped support arms 203 respectively located between each pair of L-shaped control arms 206. The multiple retrieval nets 207 rotate at the ends of the multiple pairs of L-shaped control arms 206 away from the second rotating ring 205 and are respectively located inside multiple liquid nitrogen cups 105. The top of the salvage net 207 has a discharge port 209. One end of each of the multiple inverted U-shaped support arms 208 is fixed to one of the multiple salvage nets 207, and the other end slides on one end of each of the multiple Z-shaped support arms 203 away from the first rotating ring 202. A limit push assembly is provided between the second rotating ring 205 and the lifting rod 201.

[0032] In practical use, liquid nitrogen is added to all liquid nitrogen cups 105, and all liquid nitrogen cups 105 are placed in the bottle tanks 104. During drip freezing, the rotating platform 101 rotates intermittently, causing the liquid nitrogen cups 105 to rotate intermittently. During the rotation of the liquid nitrogen cups 105, liquid nitrogen is dripped into each liquid nitrogen cup 105 one by one through the dripping mechanism. The liquid droplets freeze instantly into ice beads upon contact with the liquid nitrogen in the liquid nitrogen cups 105. Based on the number of ice beads contained in each vial, the corresponding number of ice beads are dripped into each liquid nitrogen cup 105, and then vials are placed in multiple bottle tanks 104.

[0033] Subsequently, the lifting rod 201 drives the first rotating ring 202 to move upward. Simultaneously, the lifting rod 201, through a limiting push assembly, also drives the second rotating ring 205 to move upward. As the first and second rotating rings 202 and 205 move upward, they respectively drive multiple Z-shaped support arms 203 and multiple pairs of L-shaped control arms 206 to move upward. The multiple pairs of L-shaped control arms 206 simultaneously drive multiple salvage nets 207 to move upward, removing the salvage nets 207 from the liquid nitrogen cup 105. Since the Z-shaped support arms 203 and L-shaped control arms 206 move upward together when the lifting rod 201 initially moves relative to each other, the inverted U-shaped support arms 208 are also in a horizontal upward movement state during the movement of the salvage nets 207 out of the liquid nitrogen cup 105, preventing the salvage nets 207 from rotating.

[0034] After the retrieval net 207 is removed from the liquid nitrogen cup 105, the second rotating ring 205 stops moving upward by the limiting push assembly. At this time, the lifting rod 201 continues to drive the first rotating ring 202 to move upward. The first rotating ring 202 drives multiple Z-shaped support arms 203 to move upward. Since the L-shaped control arm 206 does not move, during the upward movement of the Z-shaped support arms 203, the retrieval net 207 is rotated outward by the inverted U-shaped support arm 208. After the retrieval net 207 rotates outward, the ice beads inside slide to the discharge port 209 and fall downward from the discharge port 209 into the vial below. The discharge port 209 is located directly above the vial trough 104 after the retrieval net 207 rotates outward. Furthermore, the first rotating ring 202, the second rotating ring 205, and the lifting rod 201 are all rotatably connected. When the rotating table 101 rotates, the first rotating ring 202, the second rotating ring 205, and the lifting rod 201 also rotate relative to each other.

[0035] like Figure 1-5 As shown, the dripping mechanism includes an L-shaped support arm 108 and a dripping element 109. The L-shaped support arm 108 slides on the side wall of the control console 102. The dripping element 109 is mounted on the end of the L-shaped support arm 108 away from the control console 102 and is located on top of one of the cups 103. When dripping is required, pushing the L-shaped support arm 108 moves the dripping element 109 to the top of the cup 103 closest to the control console 102. A slide rail 106 is fixed on the side wall of the control console 102, and a moving part 107 is slidably mounted on the slide rail 106. The end of the L-shaped support arm 108 closest to the control console 102 is fixed to the moving part 107. The L-shaped support arm 108 slides on the slide rail 106 via the moving part 107, thereby sliding on the side wall of the control console 102.

[0036] like Figure 1-5As shown, each of the multiple Z-shaped support arms 203 has a groove 204 at its end away from the first rotating ring 202, and the end of the inverted U-shaped support arm 208 near the groove 204 slides on the groove 204. Each pair of inverted U-shaped support arms 208 near the groove 204 is equipped with a pulley 211, which slides within the groove 204. When the first rotating ring 202 drives the Z-shaped support arms 203 to move relative to each other, the end of the Z-shaped support arm 203 near the inverted U-shaped support arm 208 drives the fishing net 207 to rotate. When the inverted U-shaped support arm 208 rotates, the end of the inverted U-shaped support arm 208 near the pulley 211 moves not only vertically but also horizontally, thus causing the pulley 211 to slide within the groove 204.

[0037] like Figure 1-5 As shown, the limiting and pushing assembly includes: a fixed ring 212, a spring 213, and a limiting module. The fixed ring 212 is fixed to the lifting rod 201. The spring 213 is installed between the fixed ring 212 and the second rotating ring 205, and is sleeved on the lifting rod 201. The limiting module is installed on the second rotating ring 205. When the lifting rod 201 begins to move upward, the fixed ring 212 and the spring 213 drive the second rotating ring 205 and the first rotating ring 202 to move upward together. When the second rotating ring 205 moves the retrieval net 207 out of the liquid nitrogen cup 105 through the L-shaped control arm 206, the limiting module stops the second rotating ring 205 from moving upward. At this time, the lifting rod 201 continues to move downward, only driving the first rotating ring 202 to move upward, and compressing the spring 213 through the fixed ring 212, so that the counter-thrust of the spring 213 pushes the second rotating ring 205 upward tightly, preventing the second rotating ring 205 from shaking.

[0038] like Figure 1-5 As shown, the limiting module includes: a pair of extension rods 214, a pair of limiting blocks 215, and a pair of limiting grooves 216. The pair of extension rods 214 are both fixed to the bottom of the second rotating ring 205 and are located on both sides of the second rotating ring 205. The pair of limiting blocks 215 are respectively fixed to the ends of the pair of extension rods 214 away from the second rotating ring 205. The pair of limiting grooves 216 are respectively carved into the inner wall of the rotating platform 101, and the pair of limiting blocks 215 slide within the pair of limiting grooves 216. When the lifting rod 201 drives the second rotating ring 205 upward through the fixing ring 212 and the spring 213, the second rotating ring 205 drives the limiting blocks 215 upward through the extension rods 214, causing them to slide upward within the limiting grooves 216. When the limiting blocks 215 slide to the top wall of the limiting grooves 216, the second rotating ring 205 stops moving upward.

[0039] like Figure 1-5As shown, the side of the retrieval net 207 away from the inverted U-shaped support arm 208 has an inclined surface 210. This inclined surface 210 allows ice beads inside the retrieval net 207 to slide along it towards the discharge port 209 after the net rotates. An inclined baffle 217 is provided at the end of the retrieval net 207 closest to the discharge port 209. This baffle prevents the ice beads from sliding out from that end as they slide down the inclined surface 210. The end of the inverted U-shaped support arm 208 closest to the chute 204 is longer than the end closest to the retrieval net 207. Because this longer length of the inverted U-shaped support arm 208 makes it easier for the net to rotate.

[0040] Working principle: In practical use, liquid nitrogen is added to all liquid nitrogen cups 105, and all liquid nitrogen cups 105 are placed in the bottle slots 104. The moving part 107 drives the L-shaped support arm 108 to slide on the slide rail 106, so that the L-shaped support arm 108 drives the liquid dispensing part 109 to move to the top of the cup slot 103 closest to the control console 102. During drip freezing, the rotating table 101 rotates intermittently, causing the liquid nitrogen cups 105 to rotate intermittently. During the rotation of the liquid nitrogen cups 105, liquid is dripped into each liquid nitrogen cup 105 one by one through the liquid dispensing part 109. The liquid droplets fall into the liquid nitrogen cups 105 and freeze instantly into ice beads upon contact with the liquid nitrogen. Then, according to the number of ice beads in each vial, the corresponding number of ice beads are dripped into each liquid nitrogen cup 105, and multiple vials are placed in the bottle slots 104.

[0041] Subsequently, the lifting rod 201 drives the first rotating ring 202 to move upward. Simultaneously, the lifting rod 201, through the fixed ring 212 and spring 213, drives the second rotating ring 205 to move upward. As the first and second rotating rings 202 and 205 move upward, they respectively drive multiple Z-shaped support arms 203 and multiple pairs of L-shaped control arms 206 to move upward. The multiple pairs of L-shaped control arms 206 simultaneously drive multiple salvage nets 207 to move upward, removing the salvage nets 207 from the liquid nitrogen cup 105. Since the Z-shaped support arms 203 and L-shaped control arms 206 move upward together when the lifting rod 201 initially moves relative to each other, the inverted U-shaped support arms 208 are also horizontally moving upward during the movement of the salvage nets 207 out of the liquid nitrogen cup 105, preventing the salvage nets 207 from rotating.

[0042] After the retrieval net 207 is removed from the liquid nitrogen cup 105, it slides to the top wall of the limiting groove 216 via the limiting block 215, causing the second rotating ring 205 to stop moving upward. At this time, the lifting rod 201 continues to drive the first rotating ring 202 to move upward. The first rotating ring 202 drives multiple Z-shaped support arms 203 to move upward. Since the L-shaped control arm 206 does not move, during the upward movement of the Z-shaped support arms 203, the retrieval net 207 is rotated outward via the inverted U-shaped support arm 208. After the retrieval net 207 rotates outward, the ice beads inside slide along the inclined surface 210 to the discharge port 209 and fall downward from the discharge port 209 into the vial below. This completes the automatic filling of ice beads into the vial, and then the vial is transferred to the freeze dryer.

[0043] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A freeze-drying production apparatus using liquid nitrogen granulation, characterized in that, include: A base, wherein a control console is provided on one side of the top of the base; A rotating platform rotates on a base. Multiple cup slots are carved into the rotating platform, and liquid nitrogen cups are installed in each of the cup slots. Bottle slots are provided on the outside of each of the multiple cup slots. The dripping mechanism is mounted on the side wall of the control console; and The discharge mechanism is mounted on a rotating platform and includes: a lifting rod, a first rotating ring, a second rotating ring, multiple retrieval nets, and multiple inverted U-shaped support arms. The lifting rod is mounted on a base. The first rotating ring rotates at the top of the lifting rod, and the second rotating ring rotates and slides on the lifting rod. Multiple Z-shaped support arms are fixed on the side wall of the first rotating ring, and multiple pairs of L-shaped control arms are fixed on the side wall of the second rotating ring. The multiple retrieval nets rotate at the ends of the multiple pairs of L-shaped control arms away from the second rotating ring. The top of each retrieval net has a discharge port. One end of each of the multiple inverted U-shaped support arms is fixed to the multiple retrieval nets, and the other end slides on one end of each of the multiple Z-shaped support arms. A limit push assembly is provided between the second rotating ring and the lifting rod.

2. The freeze-drying production apparatus using liquid nitrogen granulation according to claim 1, characterized in that, The dripping mechanism includes: L-shaped support arms slide against the side wall of the control console; and The liquid dispensing device is installed at the end of the L-shaped support arm away from the control panel and is located on top of one of the cups.

3. The freeze-drying production apparatus using liquid nitrogen granulation according to claim 2, characterized in that, A slide rail is fixed to the side wall of the control console, and a movable component is slidably mounted on the slide rail. The end of the L-shaped support arm near the control console is fixed to the movable component.

4. The freeze-drying production apparatus using liquid nitrogen granulation according to claim 1, characterized in that, Each of the Z-shaped arms has a groove at the end furthest from the first rotating ring, and the inverted U-shaped arm slides on the groove at the end closest to it.

5. A freeze-drying production apparatus using liquid nitrogen granulation according to claim 4, characterized in that, Each of the inverted U-shaped support arms is equipped with a pulley near the sliding groove, and the pulley slides within the sliding groove.

6. A freeze-drying production apparatus using liquid nitrogen granulation according to claim 1, characterized in that, The limiting and pushing component includes: A retaining ring is used to fix the lifting rod. A spring is installed between the fixed ring and the second rotating ring, and is sleeved on the lifting rod; and The limit module is installed on the second rotating ring.

7. A freeze-drying production apparatus using liquid nitrogen granulation according to claim 6, characterized in that, The limiting module includes: A pair of extension rods are fixed to the bottom of the second rotating ring and are located on both sides of the second rotating ring; A pair of limiting blocks are respectively fixed to the ends of a pair of extension rods away from the second rotating ring; and A pair of limiting grooves are respectively carved into the inner wall of the rotary table, and a pair of limiting blocks slide in the pair of limiting grooves respectively.

8. A freeze-drying production apparatus using liquid nitrogen granulation according to claim 6, characterized in that, The salvage net has an inclined surface on the side away from the inverted U-shaped support arm.

9. A freeze-drying production apparatus using liquid nitrogen granulation according to claim 8, characterized in that, An inclined baffle is provided at one end of the retrieval net near the discharge port.

10. A freeze-drying production apparatus using liquid nitrogen granulation according to claim 9, characterized in that, The end of the inverted U-shaped support arm near the chute is longer than the end of the inverted U-shaped support arm near the retrieval net.

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