A rapid freezing device for preserving and reducing the loss of poultry and livestock meat

Abstract

This invention relates to the technical field of freezing equipment, and in particular to a rapid freezing device for preserving and reducing the loss of poultry and livestock meat. It includes a storage tank containing cryogenic liquid and two arc-shaped plates coaxially disposed on the top of the storage tank, the two arc-shaped plates being arranged in an inner-outer sleeve configuration. An arc-shaped opening and an arc-shaped connecting area are provided on the top of the storage tank, with both ends of the arc-shaped opening and the arc-shaped connecting area located between the two arc-shaped plates. By using cryogenic liquid to immerse and cool the meat, heat exchange efficiency can be effectively improved, the cooling rate of the meat can be increased, thereby reducing the volume of ice crystals, achieving rapid freezing and water-locking functions, and improving the preservation and loss reduction effect. Simultaneously, the continuous, circulating freezing mode allows for continuous processing of food, greatly improving food freezing efficiency. Several baffles on the rotating ring can maintain a sealed and isolated effect on the storage tank during the movement of the rotating ring and the meat, preventing a large amount of external air from entering the storage tank.

Description

Technical Field

[0001] This invention relates to the technical field of freezing equipment, and in particular to a rapid freezing device for preserving and reducing the loss of poultry and livestock meat. Background Technology

[0002] Preservation and loss reduction of poultry and livestock meat refers to the process of maintaining the original sensory quality, nutritional components, and food safety to the greatest extent possible through technical means during the post-slaughter processing, storage, and distribution, while reducing weight and quality losses caused by dehydration, oxidation, microbial growth, and enzymatic reactions. Rapid freezing is a key step in achieving this goal. By rapidly lowering the temperature of the meat to below -18°C, it effectively inhibits microbial growth and metabolism, delays enzymatic reactions and fat oxidation, thereby significantly extending shelf life, reducing juice loss, maintaining good texture and color, and achieving high-quality preservation and reduced consumption while increasing efficiency.

[0003] Traditional freezing processes mostly employ a forced-circulation air-cooling mode, which relies on fans to drive cold air convection for heat exchange within the low-temperature cabinet. This method has significant limitations: the heat transfer coefficient between the airflow and the surface of the meat is low, cold penetration is slow, and large ice crystals are easily formed, damaging cell structure and leading to increased juice loss after thawing. At the same time, it can only achieve batch operation mode and cannot achieve continuous freezing of meat, affecting work efficiency. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a rapid freezing device for preserving and reducing the loss of poultry and livestock meat, the specific technical solution of which is as follows:

[0005] The present invention provides a rapid freezing device for preserving and reducing the loss of poultry and livestock meat, comprising a storage tank containing a cryogenic liquid and two arc plates coaxially disposed on the top of the storage tank, the two arc plates being arranged in an inner and outer manner, an arc-shaped opening and an arc-shaped connecting area being provided on the top of the storage tank, both ends of the arc-shaped opening and the arc-shaped connecting area being located between the two arc plates, and the middle part of the arc-shaped connecting area being located on the outer side of the two arc plates;

[0006] A rotating ring is rotatably arranged between the two arc plates. The rotating ring is coaxially arranged with the storage box. Several partitions are arranged at the bottom of the rotating ring. When the partitions are moved to the area where the arc-shaped connection area overlaps with the arc plate, they can block the arc-shaped opening with the rotating ring.

[0007] A movable column is provided between two adjacent partitions. The top of the movable column passes through the rotating ring and can move vertically on the rotating ring. The bottom of the movable column is provided with a clamping structure for clamping the packaging bag containing meat.

[0008] Furthermore, the cryogenic liquid is one of carbon dioxide, liquid nitrogen, aqueous propylene glycol solution, or aqueous glycerol solution.

[0009] Furthermore, the rotating ring is provided with a plurality of side plates corresponding to each of the movable columns, a dial wheel is rotatably provided on the side plate, an adjusting arm is provided on one end face of the dial wheel, a sliding sleeve is slidably provided on the adjusting arm, and the sliding sleeve is rotatably connected to the movable column;

[0010] A sliding column is eccentrically arranged on the other end face of the dial, and a guide ring is arranged on the outer side of a plurality of movable columns. The guide ring is fixed relative to the storage box. The guide ring includes an arc groove body one, an arc groove body two, and two inclined groove bodies for connecting the arc groove body one and the arc groove body two. The sliding column is slidably arranged on the guide ring.

[0011] Furthermore, along the circumferential direction of the rotating ring, the dial is located on one side or the other side of the vertical line where the sliding sleeve is located.

[0012] Furthermore, the clamping structure includes a support frame fixed to the bottom of the movable column, and two side pressure bodies are rotatably arranged on the support frame. When the two side pressure bodies are connected, they form a V-shape with the opening facing downwards. The side pressure bodies are connected to the corresponding support frame through an elastic body.

[0013] Furthermore, a fixing groove is provided on the side pressure body, and a secondary pressure body that cooperates with the side pressure body is rotatably arranged in the fixing groove. The secondary pressure body and the side pressure body are connected by an elastic body. A limiting groove is provided at the bottom of the secondary pressure body, and a limiting post that is fixed relative to the side pressure body is provided in the limiting groove.

[0014] Furthermore, a pump body and an installation cavity are respectively provided on the storage box and one of the arc plates, the installation cavity is spatially connected to the two arc plates, and a plurality of nozzles are provided in the installation cavity;

[0015] The input end of the pump body is connected to the storage tank, and the output end of the pump body is provided with an exhaust pipe. A secondary pipe is connected to the side wall of the exhaust pipe, and the secondary pipe is connected to several nozzles. A pressure regulating valve for adjusting the internal pressure of the secondary pipe is provided on the exhaust pipe.

[0016] Furthermore, the two ends of the arc-shaped connecting area are connected to the overlapping area of ​​the arc plate through a conductive pipe.

[0017] The beneficial effects of this invention are as follows:

[0018] By using cryogenic liquid to immerse meat in cooling, heat exchange efficiency can be effectively improved, the cooling rate of meat can be increased, thereby reducing the volume of ice crystals, achieving rapid freezing and water-locking functions, improving the preservation and loss reduction effect. At the same time, the continuous and circulating freezing mode can realize continuous processing of food, greatly improving the freezing efficiency of food. By using several baffles set on the rotating ring, the storage box can be kept sealed and isolated when the rotating ring and meat move, preventing a large amount of outside air from entering the storage box. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the exploded structure;

[0022] Figure 3 yes Figure 2 Schematic diagram of the structure of the storage box;

[0023] Figure 4 yes Figure 2 Schematic diagram of the rotating ring and its structure;

[0024] Figure 5 yes Figure 4 A structural diagram from another perspective;

[0025] Figure 6 yes Figure 4 Schematic diagram of the middle side plate and its superstructure;

[0026] Figure 7 yes Figure 4 A schematic diagram of the central movable column and its superstructure;

[0027] Figure 8 yes Figure 7 A partial cross-sectional structural diagram.

[0028] Figure label:

[0029] 1. Storage box; 2. Arc-shaped opening; 3. Arc-shaped connection area; 4. Arc plate; 5. Rotating ring; 6. Partition; 7. Movable column; 8. Side plate; 9. Dial wheel; 10. Adjusting arm; 11. Sliding sleeve; 12. Sliding column; 13. Arc groove body one; 14. Arc groove body two; 15. Inclined groove body; 16. Support frame; 17. Side pressure body; 18. Elastic body one; 19. Secondary pressure body; 20. Elastic body two; 21. Limiting column; 22. Pump body; 23. Mounting cavity; 24. Nozzle; 25. Exhaust pipe; 26. Secondary pipe; 27. Pressure regulating valve; 28. Conductor pipe. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0033] like Figures 1 to 8 As shown, a rapid freezing device for preserving and reducing the loss of poultry and livestock meat according to the present invention includes a storage box 1 containing a cryogenic liquid and two arc plates 4 coaxially disposed on the top of the storage box 1. The two arc plates 4 are arranged in an inner and outer manner. An arc-shaped opening 2 and an arc-shaped connecting area 3 are provided on the top of the storage box 1. Both ends of the arc-shaped opening 2 and the arc-shaped connecting area 3 are located between the two arc plates 4, and the middle part of the arc-shaped connecting area 3 is located on the outer side of the two arc plates 4.

[0034] A rotating ring 5 is rotatably arranged between the two arc plates 4. The rotating ring 5 is coaxially arranged with the storage box 1. Several partitions 6 are arranged at the bottom of the rotating ring 5. The partitions 6 that move to the area where the arc connecting area 3 overlaps with the arc plate 4 can block the arc opening 2 with the rotating ring 5.

[0035] A movable column 7 is provided between two adjacent partitions 6. The top of the movable column 7 passes through the rotating ring 5 and can move vertically on the rotating ring 5. The bottom of the movable column 7 is provided with a clamping structure for clamping the packaging bag containing meat.

[0036] In this invention, the top of the storage box 1 has an annular area, which consists of an arc-shaped opening 2 and an arc-shaped connecting area 3. Two arc-shaped plates 4 are arranged on the outer side of this area, covering the same angle on a circle in the horizontal plane. The two arc-shaped plates 4 form an arc-shaped channel. The middle of this channel is connected to the storage box 1 through the arc-shaped opening 2. Both ends of this channel extend to the ends of the arc-shaped connecting area 3, meaning there is an overlapping area between the channel and the arc-shaped connecting area 3. The middle of the arc-shaped connecting area 3 is located outside the channel, thus allowing the middle of the arc-shaped connecting area 3 to be used as the loading / unloading position. A rotating ring 5 is rotatably positioned between the two arc-shaped plates 4. Furthermore, the rotating ring 5 seals the top of the channel between the two arc plates 4. When the rotating ring 5 rotates, it will circulate inside and outside the channel. The rotation of the rotating ring 5 can be powered by a motor. Several partitions 6 at the bottom of the rotating ring 5 can divide the space under the rotating ring 5 into several small chambers. When the partition 6 moves to the area where the channel overlaps with the arc-shaped connection area 3, the partition 6 seals the area, thereby isolating the storage box 1 from the outside world and preventing external air from entering the storage box 1. At the same time, when the rotating ring 5 rotates, there is at least one partition 6 in the area where the channel overlaps with the arc-shaped connection area 3, thereby ensuring the long-term effectiveness of the isolation state.

[0037] In use, the rotating ring 5 rotates and carries the movable column 7 and the clamping structure at the bottom of the movable column 7 to the middle of the arc-shaped connecting area 3, fixing the opening of the packaging bag containing meat onto the clamping structure. The packaging bag is designed to prevent moisture evaporation from the meat, achieving water-locking and preservation functions. The rotating ring 5 rotates and carries the packaging bag through the overlapping area of ​​the channel and the arc-shaped connecting area 3 into the area corresponding to the arc-shaped opening 2. At this time, the meat is still between the two arc plates 4, and because the arc-shaped opening 2 connects the storage box 1 and the space between the two arc plates 4, the temperature in the area between the two arc plates 4 corresponding to the arc-shaped opening 2 is also low, thus ensuring the meat's freshness. The meat is initially frozen by pushing the movable column 7 through the rotating ring 5 and moving downwards. The packaging bag containing the meat is moved into the cryogenic liquid in the storage box 1. The cryogenic liquid directly freezes the packaging bag and the meat in contact and in a fully enclosed manner, which is faster than air cooling. As the rotating ring 5 moves, the meat moves in the cryogenic liquid, which creates relative flow between the cryogenic liquid and the meat, improving heat exchange and freezing effects. After the meat is frozen, the movable column 7 is lifted, so that the meat moves back between the two arc plates 4. When the rotating ring 5 rotates back to the initial position, the meat moves outside the two arc plates 4, and can be replaced and cooled repeatedly.

[0038] By using cryogenic liquid to immerse meat in cooling, heat exchange efficiency can be effectively improved, the cooling rate of meat can be increased, thereby reducing the volume of ice crystals, achieving rapid freezing and water-locking functions, improving the preservation and loss reduction effect. At the same time, the continuous and circulating freezing mode can realize continuous processing of food, greatly improving the freezing efficiency of food. By using several partitions 6 set on the rotating ring 5, the storage box 1 can be kept sealed and isolated when the rotating ring 5 and the meat move, preventing a large amount of external air from entering the storage box 1.

[0039] Furthermore, the cryogenic liquid is one of carbon dioxide, liquid nitrogen, aqueous propylene glycol solution, or aqueous glycerol solution.

[0040] All of the above liquids can be used to achieve contact freezing of meat. Different types of liquids can be selected depending on the cost. In actual use, in order to reduce the loss of such liquids, liquids with low volatility can be used, such as propylene glycol aqueous solution, glycerin aqueous solution, edible alcohol aqueous solution, perfluoropolyether or fluorinated liquid, etc.

[0041] Furthermore, the rotating ring 5 is provided with several side plates 8 corresponding to each movable column 7, and a dial 9 is rotatably provided on the side plate 8. An adjusting arm 10 is provided on one end face of the dial 9, and a sliding sleeve 11 is slidably provided on the adjusting arm 10. The sliding sleeve 11 is rotatably connected to the movable column 7.

[0042] A sliding post 12 is eccentrically arranged on the other end face of the dial 9. A guide ring is arranged on the outer side of several movable posts 7. The guide ring is fixed relative to the storage box 1. The guide ring includes an arc groove 13, an arc groove 2 14 and two inclined grooves 15 for connecting the arc groove 13 and the arc groove 2 14. The sliding post 12 is slidably arranged on the guide ring.

[0043] When the rotating ring 5 rotates, the movable column 7 and the side plate 8 move synchronously. At this time, the side plate 8 pushes the sliding column 12 to slide on the guide ring. When the sliding column 12 slides in the arc groove 13 or the inclined groove 15, the vertical height of the sliding column 12 changes. At this time, the sliding column 12 can push the dial wheel 9 to rotate. The dial wheel 9 pushes the movable column 7 to move in the vertical direction through the adjusting arm 10 and the sliding sleeve 11, thereby providing the moving power for the movable column 7. Moreover, this structure does not require other power sources. It can drive the movable column 7 to move simply by using the rotation of the rotating ring 5. When the dial wheel 9 rotates, the movable column 7 pushes the sliding sleeve 11 to slide on the adjusting arm 10 in the opposite direction. The inclined groove 15 is mainly used to connect the two ends of the arc groove 13 and the arc groove 14, so that the sliding column 12 can smoothly transition between the arc groove 13 and the arc groove 14.

[0044] Furthermore, along the circumferential direction of the rotating ring 5, the dial 9 is located on one side or the other side of the vertical line where the sliding sleeve 11 is located.

[0045] When the dial 9 coincides with the vertical line of the sliding sleeve 11, the sliding sleeve 11 restricts the dial 9 in the opposite direction, preventing the dial 9 from rotating. At this time, the dial 9 and the sliding sleeve 11 are locked together. However, when the dial 9 deviates from the vertical line of the sliding sleeve 11, the dial 9 can rotate normally and drive the sliding sleeve 11 and the movable column 7 to move. At the same time, the rotation angle of the dial 9 can be less than a semicircle, so that the dial 9 and the sliding column 12 on it can cooperate normally with the guide ring. This avoids the guide ring being unable to meet the motion mode of the dial 9 when the rotation angle of the dial 9 is equal to or greater than a semicircle.

[0046] Furthermore, the clamping structure includes a support frame 16 fixed to the bottom of the movable column 7. Two pressure bodies 17 are rotatably arranged on the support frame 16. When the two pressure bodies 17 are connected, they form a V-shape with the opening facing downward. The side pressure bodies 17 are connected to the corresponding support frame 16 through an elastic body 18.

[0047] like Figure 7 As shown, the left side pressure body 17 is tilted to the upper right, and the right side pressure body 17 is tilted to the upper left. The two pressure bodies 17 abut against each other. When the packaging bag containing meat is inserted between the two pressure bodies 17, the friction between the packaging bag and the side pressure body 17 and the weight of the meat will provide a downward force for the side pressure body 17. The tilting setting of the side pressure body 17 will make the two pressure bodies 17 fit together more tightly, and the two pressure bodies 17 will clamp the packaging bag more firmly, thereby achieving the anti-loosening clamping effect of the packaging bag.

[0048] Furthermore, a fixing groove is provided on the side pressure body 17, and a secondary pressure body 19 that works in conjunction with the side pressure body 17 is rotatably arranged in the fixing groove. The secondary pressure body 19 and the side pressure body 17 are connected by an elastic body 20. A limiting groove is provided at the bottom of the secondary pressure body 19, and a limiting post 21 that is fixed relative to the side pressure body 17 is provided in the limiting groove.

[0049] like Figure 8 As shown, the limiting groove and limiting post 21 can limit the angle of the auxiliary pressure body 19 on the side pressure body 17. In the natural state, the auxiliary pressure body 19 cooperates with the side pressure body 17 and clamps the packaging bag at the same time. When the packaging bag is immersed in the cryogenic liquid, the pressure of the liquid will squeeze out the gas in the packaging bag. At this time, the gas can push the auxiliary pressure body 19 to rotate upward, and the elastic body 20 undergoes elastic deformation, which facilitates the squeezing out of the gas in the packaging bag and avoids the gas from directly contacting the meat with the packaging bag and the cryogenic liquid.

[0050] Furthermore, a pump body 22 and an installation cavity 23 are respectively provided on the storage box 1 and an arc plate 4. The installation cavity 23 is spatially connected to the two arc plates 4, and a number of nozzles 24 are provided in the installation cavity 23.

[0051] The input end of the pump body 22 is connected to the storage tank 1. The output end of the pump body 22 is provided with an exhaust pipe 25. A secondary pipe 26 is connected to the side wall of the exhaust pipe 25. The secondary pipe 26 is connected to several nozzles 24. A pressure regulating valve 27 for adjusting the internal pressure of the secondary pipe 26 is provided on the exhaust pipe 25.

[0052] like Figure 3 As shown, the ends of several nozzles 24 are all located within the mounting cavity 23, so that the nozzles 24 do not obstruct the movement of the partition 6 between the two arc plates 4; when the rotating ring 5 rotates, external air can enter between the two partition plates 6 and move into the storage tank 1 along with the partition plates 6. At the same time, with the long-term use of the cryogenic liquid, some of it will evaporate, and this gas will also fill the storage tank 1 and the space between the two arc plates 4. The pump body 22 can extract the evaporated gas and the air entering the equipment, thereby ensuring stable internal air pressure and facilitating the reduction of the amount of air inside the equipment; in some embodiments, a pump is used The pump body 22 can also create a vacuum negative pressure state inside the equipment, thereby achieving a vacuum freezing effect. The gas extracted by the pump body 22 can be discharged to the external collection equipment through the exhaust pipe 25 to facilitate the recovery and re-cooling of the gas volatilized by the cryogenic liquid. At the same time, the pressure regulating valve 27 limits the pressure of the gas discharged from the exhaust pipe 25, so that some of the gas in the exhaust pipe 25 is discharged back into the space between the two arc plates 4 through the secondary pipe 26 and several nozzles 24. At this time, the gas discharged into the space between the two arc plates 4 by the nozzles 24 will blow off the cryogenic liquid on the surface of the packaging bag on the clamping structure, thereby reducing the loss of cryogenic liquid.

[0053] Furthermore, the two ends of the arc-shaped connecting area 3 are connected to the overlapping area of ​​the arc plate 4 through the conductive tube 28.

[0054] When the frozen meat is moved to the overlapping area between one end of the arc-shaped connecting area 3 and the channel, the low-temperature gas between the two partitions 6 can be transferred through the guide pipe 28 to the overlapping area between the other end of the arc-shaped connecting area 3 and the channel. At this time, the meat to be frozen in this area can be initially cooled, and energy loss can be reduced.

[0055] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A rapid freezing device for preserving and reducing the loss of poultry and livestock meat, characterized in that, It includes a storage tank containing cryogenic liquid and two arc plates coaxially disposed on the top of the storage tank. The two arc plates are arranged in an inner and outer arrangement. An arc-shaped opening and an arc-shaped connecting area are provided on the top of the storage tank. Both ends of the arc-shaped opening and the arc-shaped connecting area are located between the two arc plates, and the middle part of the arc-shaped connecting area is located on the outer side of the two arc plates. A rotating ring is rotatably arranged between the two arc plates. The rotating ring is coaxially arranged with the storage box. Several partitions are arranged at the bottom of the rotating ring. When the partitions are moved to the area where the arc-shaped connection area overlaps with the arc plate, they can block the arc-shaped opening with the rotating ring. A movable column is provided between two adjacent partitions. The top of the movable column passes through the rotating ring and can move vertically on the rotating ring. The bottom of the movable column is provided with a clamping structure for clamping a packaging bag containing meat. The clamping structure includes a support frame fixed to the bottom of the movable column. Two side pressure bodies are rotatably arranged on the support frame. When the two side pressure bodies are connected, they form a V-shape with the opening facing downward. The side pressure bodies are connected to the corresponding support frame through an elastic body. A fixing groove is provided on the side pressure body, and a secondary pressure body that cooperates with the side pressure body is rotatably arranged in the fixing groove. The secondary pressure body and the side pressure body are connected by an elastic body. A limiting groove is provided at the bottom of the secondary pressure body, and a limiting post that is fixed relative to the side pressure body is provided in the limiting groove. A pump body and a mounting cavity are respectively provided on the storage box and one of the arc plates. The mounting cavity is spatially connected to the two arc plates, and a plurality of nozzles are provided in the mounting cavity. The input end of the pump body is connected to the storage tank, and the output end of the pump body is provided with an exhaust pipe. A secondary pipe is connected to the side wall of the exhaust pipe, and the secondary pipe is connected to several nozzles. A pressure regulating valve for adjusting the internal pressure of the secondary pipe is provided on the exhaust pipe.

2. The rapid freezing device for preserving and reducing the loss of poultry and livestock meat according to claim 1, characterized in that, The cryogenic liquid is one of carbon dioxide, liquid nitrogen, aqueous propylene glycol solution, or aqueous glycerol solution.

3. The rapid freezing device for preserving and reducing the loss of poultry and livestock meat according to claim 1, characterized in that, The rotating ring is provided with a number of side plates corresponding to each of the movable columns. A dial wheel is rotatably provided on the side plate. An adjusting arm is provided on one end face of the dial wheel. A sliding sleeve is slidably provided on the adjusting arm. The sliding sleeve is rotatably connected to the movable column. A sliding column is eccentrically arranged on the other end face of the dial, and a guide ring is arranged on the outer side of a plurality of movable columns. The guide ring is fixed relative to the storage box. The guide ring includes an arc groove body one, an arc groove body two, and two inclined groove bodies for connecting the arc groove body one and the arc groove body two. The sliding column is slidably arranged on the guide ring.

4. The rapid freezing device for preserving and reducing the loss of poultry and livestock meat according to claim 3, characterized in that, Along the circumferential direction of the rotating ring, the dial is located on one side or the other side of the vertical line where the sliding sleeve is located.

5. The rapid freezing device for preserving and reducing the loss of poultry and livestock meat according to claim 1, characterized in that, The two ends of the arc-shaped connecting area are connected to the overlapping area of ​​the arc plate through a conductive pipe.

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