CN113647432B

CN113647432B - Can be with waste heat recovery's food processing with baking food heat sink

Info

Publication number: CN113647432B
Application number: CN202110912245.1A
Authority: CN
Inventors: 程亮
Original assignee: Guangdong Liangxin No 1 Food Co ltd
Current assignee: Guangdong Liangxin No 1 Food Co ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2022-09-23
Anticipated expiration: 2041-08-06
Also published as: CN113647432A

Abstract

The invention discloses a baked food cooling device for food processing, which can recover waste heat and comprises a cooling box, wherein an inlet is arranged below one side of the cooling box, a bamboo mat bottom plate is arranged below the cooling box, a bottom cavity is arranged between the bottom of the bamboo mat bottom plate and the bottom in the cooling box, a rotating mechanism is arranged in the bottom cavity and on the side far away from the inlet, a honeycomb plate is transversely arranged at the upper part in the cooling box, a resin convex mirror is arranged at the top of the honeycomb plate, a plurality of exhaust holes are arranged on the resin convex mirror, a plurality of air outlet ports are arranged at the top of the cooling box and on the side far away from the inlet, an exhaust pipe I, an exhaust pipe II and an exhaust pipe III are respectively connected to the air outlet ports, air storage tanks are respectively connected to the outer ends of the exhaust pipe I, the exhaust pipe II and the exhaust pipe III, so that food can be effectively cooled, and direct contact with air is avoided, the safety performance of the food is improved, and the food is prevented from being polluted by external factors.

Description

Can be with waste heat recovery's food processing with baking food heat sink

Technical Field

The invention relates to the technical field of food processing equipment, in particular to a baked food cooling device capable of recovering waste heat for food processing.

Background

Food processing can divide into and bake, cook, compress, processes such as popped, in the baked food in-process, the food after baking is because the inconvenient processing of high temperature, generally all need cool off, in order to guarantee that food can in time be sealed up for keeping, guarantee the taste of food, current cooling methods takes out and places on the support that holds for the operator with the food that toasts, directly put in spacious space direct cooling, this kind of food cooling methods, on the one hand, the cooling time is longer, on the other hand makes food directly expose in the air, be polluted by bacterium or people easily, cause the emergence of food bad phenomena such as mildening, seriously threaten consumer's healthy.

Disclosure of Invention

The technical task of the invention is to provide a baked food cooling device for food processing, which can recover waste heat, so as to solve the problems.

The technical scheme of the invention is realized as follows:

a baked food cooling device capable of recovering waste heat for food processing comprises a cooling box, an inlet is arranged below one side of the cooling box, a bamboo mat bottom plate is arranged at the bottom surface of the inlet and at the lower part in the cooling box, a bottom cavity is arranged between the bottom of the bamboo mat bottom plate and the bottom in the cooling box, a rotating mechanism is arranged in the bottom cavity and on one side far away from the inlet, the top surface of the rotating mechanism is higher than the top surface of the bamboo mat bottom plate, wherein, a honeycomb plate is arranged at the upper part in the cooling box in a transverse way, a resin convex mirror is arranged at the top of the honeycomb plate, the resin convex mirror is provided with a plurality of exhaust holes, the top of the cooling box and the top of one side far away from the inlet are provided with a plurality of air outlet ports, the air outlet port is connected with an exhaust pipe I, an exhaust pipe II and an exhaust pipe III respectively, and the outer ends of the exhaust pipe I, the exhaust pipe II and the exhaust pipe III are connected with air storage tanks.

The utensil that will place the baked food passes through conveying mechanism and pushes into rotary mechanism on, then drive the baked food rotation through rotary mechanism's the turning force, and then the power of multiplicable wind, make the wind-force that produces carry out automatically cooling to food, and through adopting bamboo mat bottom plate as supporting pallet, make the self material of accessible bamboo mat can effectively reduce the inside temperature of cooling box, especially have fine cooling effect to the food of placing on bamboo mat bottom plate, then can make steam up under the rotation effect when food, then pass honeycomb panel and resin convex mirror, at last then discharge into the gas holder through a plurality of exhaust pipe and carry out effectual collection, so that follow-up utilization, the reproducibility of the energy has been improved.

Preferably, the honeycomb panel comprises a plurality of honeycomb block, wherein, all inlays the sponge between the arbitrary honeycomb block, just the middle part of honeycomb block all is equipped with fretwork formula through-hole, the through-hole will cooling box below link up with the top, can be effectual will distribute the moisture that contains in the hot steam that comes through the sponge and adsorb, avoid the moisture in the steam to influence the use of waste heat in the gas holder along with steam is retrieved together.

As preferred, the surface of resin convex mirror adopts metal powder to filter processing preparation formation, exhaust pipe one exhaust pipe two and exhaust pipe three is nonrust pipe, wherein, exhaust pipe one exhaust pipe two and the equal coating of three inner walls of exhaust pipe has insulating coating, exhaust pipe one exhaust pipe two and the outer wall of exhaust pipe three all coats and has the insulating layer, still coats in every exhaust pipe inside and has the heat preservation, prevents that the waste heat from giving off.

As preferred, the cooling case outside just is located cooling case below and keeping away from be equipped with wind-force return channel between one side of the import, wind-force return channel just keeps away from cooling case one side is equipped with a plurality of second pipeline, the second pipeline outer end all is connected with first pipeline, first pipeline just keeps away from second pipeline one end all is equipped with the funnel, wherein, the pipe diameter of first pipeline is greater than the pipe diameter of second pipeline, adopts the big pipeline of a pipeline little, then the propagation velocity of multiplicable wind.

Preferably, the gas outlet of gas holder is connected with the pipeline, the pipeline just keeps away from the one end and the outside food sterilization case of gas holder, fermenting case and artificial containers are connected, and the steam with retrieving can be used to sterilization, food fermentation and grow seedlings and cultivate the use, also can be used to the electricity generation and use, avoids the waste of steam.

As preferred, the top of bamboo mat bottom plate just is close to import one side is equipped with conveying mechanism, conveying mechanism is including the cylinder that the symmetry set up, the cylinder is fixed respectively on the both ends of bamboo mat bottom plate top one side, wherein, the corresponding side of both ends cylinder all is equipped with the fixed plate, evenly is equipped with a plurality of transport roller between the fixed plate of both ends, and arbitrary a set of is adjacent carry between the roller and all be located all be equipped with the semi-arc concave surface on the fixed plate side, just be close to the conveying mechanism that entrance point department set up in one side of bamboo mat bottom plate, then play limiting displacement, can carry on spacingly for food utensil, let food utensil push away rotary mechanism on, avoid producing the condition of skew in transportation process.

Preferably, the inner end of the half-arc concave surface is provided with a first limiting groove, one end of the half-arc concave surface is provided with a second limiting groove, the second limiting groove penetrates through the side edge of the cylinder and extends into the cylinder, a reset spring is arranged in the second limiting groove, the other end of the reset spring is provided with a drive plate, one end of the reset spring, which is far away from the drive plate, is provided with a U-shaped groove, a limiting roller is clamped in the U-shaped groove, the limiting roller is located above the conveying roller shaft, and the conveying mechanism can be used for appliances of different shapes, such as circular and square.

Preferably, the rotating mechanism comprises a rotating ring with a hollow structure, a side ring is arranged at the bottom of the rotating ring, a plurality of rotating support brackets are arranged on the side edge of the rotating ring, the rotating support brackets penetrate through the bottom cavity and the bamboo mat bottom plate and extend to the upper part of the bamboo mat bottom plate, and a first gear is arranged at the top of the rotating ring and close to the hollow structure.

Furthermore, bottom one end just is located in the bottom chamber the inboard center department of side ring is equipped with the motor, the output of motor is connected with main pivot, the output of main pivot is connected with gear four, four top both sides of gear all be equipped with gear four-phase meshing's gear three, three outside middle parts of gear all alternate and are equipped with inferior pivot, inferior pivot and keep away from three one end of gear all be equipped with gear one-phase meshing gear two, wherein, the middle part of inferior pivot all is equipped with the cylinder, the cylindrical bottom is all fixed bottom in the bottom chamber is located on the inboard both ends of side ring.

The natural wind is generated by the rotating force of the rotating mechanism, so that the food cooling speed can be increased, the hot gas transmission speed can also be increased, the food cooling time is further shortened, the working efficiency is improved, and the cooled food can be sealed and stored in time, so that the taste of the food is ensured.

Compared with the prior art, the invention has the advantages and positive effects that:

1. the utensil that will place the baking food pushes into rotary mechanism through conveying mechanism on, the turning force through rotary mechanism then drives the baking food rotation, and then the power of multiplicable wind, make the wind-force of production carry out the automatically cooling to food, and through adopting bamboo mat bottom plate as the support splint, make the self material of accessible bamboo mat can effectively reduce the inside temperature of cooling box, especially have fine cooling effect to placing the food on bamboo mat bottom plate, then can make steam up under the rotation effect when food, then pass honeycomb panel and resin convex mirror, at last then arrange into the gas holder through a plurality of exhaust pipe and carry out effectual collection, so that follow-up utilization, the reproducibility of the energy has been improved.

2. Can effectually cool down food, avoid direct contact air simultaneously, the effectual security performance that increases food also prevents that external factors from causing the phenomenon of pollution to food.

3. Wherein, what the resin convex mirror then adopted is that the principle of traditional sunglasses realizes, make the steam accessible resin convex mirror that comes to pass stop, form the effect of destructive interference, thereby can block above steam and transmit the below again and go, play isolated effect, in addition, the honeycomb panel then adopts a plurality of honeycomb pieces to connect, and all inlay between every adjacent honeycomb piece has the sponge, make the vapor that contains in the steam that comes to pass adsorb it behind the sponge, thereby separate the water smoke in the steam and gas, the convenience is used after retrieving the waste heat.

4. In addition, set up wind-force return channel in cooling case below, then transmit external wind to first pipeline through the funnel, then spread into the second pipeline through first pipeline again, form the circulation flow in entering into wind-force return channel at last, wherein, set up the pipe diameter that is greater than the second pipeline with the pipe diameter of first pipeline to increase the transmission speed of wind, make and adopt the temperature on this kind of gimmick can effectual reduction cooling tank wall.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of an overall architecture according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a honeycomb panel structure according to an embodiment of the invention;

FIG. 3 is a schematic structural view of a conveying mechanism at the bottom plate end of a bamboo mat according to an embodiment of the invention;

fig. 4 is a schematic structural view of a rotating mechanism according to an embodiment of the present invention.

In the figure:

1. a cooling box; 2. an inlet; 3. a bamboo mat base plate; 4. a bottom cavity; 5. a honeycomb panel; 6. a resin convex mirror; 7. an exhaust hole; 8. an air outlet port; 9. a first exhaust pipe; 10. a second exhaust duct; 11. a third exhaust duct; 12. a gas storage tank; 13. a honeycomb block; 14. sponge; 15. a through hole; 16. a wind return channel; 17. a second conduit; 18. a first conduit; 19. a funnel; 20. a cylinder; 21. a fixing plate; 22. a conveying roller shaft; 23. a semi-arc concave surface; 24. a second limiting groove; 25. a return spring; 26. a drive plate; 27. limiting rollers; 28. a rotating ring; 29. a side ring; 30. a rotating support bracket; 31. a first gear; 32. a motor; 33. a main rotating shaft; 34. a fourth gear; 35. a third gear; 36. a secondary rotating shaft; 37. a second gear; 38. and (4) a cylinder.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

The invention is further described with reference to the following figures and specific examples.

According to an embodiment of the present invention, a device for cooling baked food for food processing capable of recovering waste heat is provided, as shown in fig. 1 to 4, wherein,

example one

As shown in fig. 1-2:

the invention provides a baked food cooling device capable of recovering waste heat for food processing, which comprises a cooling box 1, wherein an inlet 2 is arranged below one side of the cooling box 1, a bamboo mat base plate 3 is arranged at the bottom surface of the inlet 2 and below the cooling box 1, a bottom cavity 4 is arranged between the bottom of the bamboo mat base plate 3 and the bottom of the cooling box 1, a rotating mechanism is arranged in the bottom cavity 4 and on the side far away from the inlet 2, the top surface of the rotating mechanism is higher than the top surface of the bamboo mat base plate 3, a honeycomb plate 5 is transversely arranged at the upper part of the cooling box 1, a resin convex mirror 6 is arranged at the top of the honeycomb plate 5, a plurality of exhaust holes 7 are arranged on the resin convex mirror 6, a plurality of air outlet ports 8 are arranged at the top of the cooling box 1 and on the side far away from the inlet 2, and exhaust pipes 9 and exhaust pipes are respectively connected to the air outlet ports 8, The exhaust pipe II 10 and the exhaust pipe III 11, the exhaust pipe I9, the exhaust pipe II 10 and the outer end of the exhaust pipe III 11 are all connected with a gas storage tank 12.

In addition, the honeycomb panel 5 comprises a plurality of honeycomb piece 13, wherein, all inlays sponge 14 between the arbitrary honeycomb piece 13, just the middle part of honeycomb piece 13 all is equipped with fretwork formula through-hole 15, through-hole 15 will cooling box 1 below link up with the top, the surface of resin convex mirror 6 adopts metal powder to filter the processing preparation to form, exhaust pipe one 9 exhaust pipe two 10 and exhaust pipe three 11 are nonrust pipe, wherein, exhaust pipe one 9 exhaust pipe two 10 and exhaust pipe three 11 inner wall all coats and has insulating coating, exhaust pipe one 9 exhaust pipe two 10 and exhaust pipe three 11's outer wall all coats and has the insulating layer, cooling box 1 outside just is located cooling box 1 below and keeps away from be equipped with wind-force return channel 16 between 2 one side of import, wind-force return channel 16 just keeps away from cooling box 1 one side is equipped with a plurality of second pipeline 17, second pipeline 17 outer end all is connected with first pipeline 18, first pipeline 18 just keeps away from second pipeline 17 one end all is equipped with funnel 19, wherein, first pipeline 18's pipe diameter is greater than second pipeline 17's pipe diameter, the gas outlet of gas holder 12 is connected with the pipeline, the pipeline just keeps away from the one end and the outside food sterilization case of gas holder 12, fermenting case and artificial containers are connected.

Example two

As shown in fig. 1 and fig. 3-4:

In addition, a conveying mechanism is arranged on the top of the bamboo mat base plate 3 and on the side close to the inlet 2, the conveying mechanism comprises symmetrically arranged cylinders 20, the cylinders 20 are respectively fixed on two ends of one side of the top of the bamboo mat base plate 3, wherein the corresponding sides of the cylinders 20 at two ends are respectively provided with a fixing plate 21, a plurality of conveying roller shafts 22 are uniformly arranged between the fixing plates 21 at two ends, a semi-arc concave surface 23 is arranged between any one group of adjacent conveying roller shafts 22 and on the side edge of the fixing plate 21, the inner ends of the semi-arc concave surfaces 23 are respectively provided with a first limiting groove, one end of the first limiting groove far away from the semi-arc concave surface 23 is respectively provided with a second limiting groove 24, the second limiting groove 24 penetrates through the side edge of the cylinder 20 and extends into the cylinder 20, wherein a reset spring 25 is arranged in the second limiting groove 24, and the other end of the reset spring 25 is provided with a driving plate 26, drive plate 26 just keeps away from reset spring 25's one end all is equipped with U type groove, the equal joint of U type inslot has spacing gyro wheel 27, spacing gyro wheel 27 is located carry roller shaft 22 top.

Meanwhile, the rotating mechanism comprises a rotating ring 28 with a hollow structure, a side ring 29 is arranged at the bottom of the rotating ring 28, a plurality of rotating support brackets 30 are arranged at the side edge of the rotating ring 28, the rotating support brackets 30 penetrate through the bottom cavity 4 and the bamboo mat bottom plate 3 and extend to the upper part of the bamboo mat bottom plate 3, a first gear 31 is arranged at the top of the rotating ring 28 and close to the hollow structure, a motor 32 is arranged at one end of the bottom in the bottom cavity 4 and at the center of the inner side of the side ring 29, the output end of the motor 32 is connected with a main rotating shaft 33, the output end of the main rotating shaft 33 is connected with a fourth gear 34, third gears 35 meshed with the fourth gear 34 are arranged on two sides above the fourth gear 34, secondary rotating shafts 36 are inserted in the middle parts of the outer sides of the third gears 35, and second gears 37 meshed with the first gears 31 are arranged at one ends of the secondary rotating shafts 36 far away from the third gears 35, the middle of the secondary rotating shaft 36 is sleeved with a cylinder 38, and the bottom of the cylinder 38 is fixed at the bottom in the bottom cavity 4 and located at two ends of the inner side of the side ring 29.

The detailed use method and action of the embodiment are as follows:

the baked food utensil is placed at the end of the inlet 2 together, the utensil is pushed by an external tool to make the utensil move forwards on the conveying roller shaft 22, the limiting rollers 27 at two sides move towards two sides in the moving process, the return spring 25 is pressed to approach the limiting groove, so that the track motion of the utensil is limited, the utensil is conveniently pushed to the rotary supporting bracket 30 of the rotary mechanism, at the moment, an externally-installed control key is driven, the control key drives the motor 32 to rotate, the motor 32 drives the main rotating shaft 33 to rotate, the main rotating shaft 33 drives the gear four 34 to rotate, the gear four 34 drives the gear three 35 meshed with two sides above to rotate, the gear three 35 drives the secondary rotating shaft 36 to rotate in the cylinder 38 after rotating, the gear two 37 connected with the other end is driven to rotate, and the gear two 37 drives the gear one 31 meshed with the lower part to rotate, wherein, because the first gear 31 is arranged on the top of the rotating ring 28, when the first gear 31 rotates, the rotating ring 28 rotates, and the rotating support brackets 30 which are clamped at the sides of the rotating ring 28 rotate, so the appliance above and the food in the appliance can be driven to rotate together, wind speed is generated in the rotating process, wind power can effectively cool the food, the cooling speed is improved, wherein hot air of the food can rise upwards to pass through the through holes 15 of the honeycomb plate 5, moisture contained in the food can be absorbed when contacting with the sponge 14, then the hot air can rise upwards to float into the top of the cooling box 1 through the exhaust holes 7, then is discharged into each exhaust pipe from the exhaust ports 8, and finally enters the air storage tank 12 for storage, wherein wind energy generated from the outside enters the first pipeline 18 through the funnels 19, then enters the wind power return channel 16 from the second pipeline 17 to circularly flow, so that the temperature of the wall of the cooling box 1 can be effectively reduced.

The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the disclosed embodiments, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.

Claims

1. The baked food cooling device capable of recycling waste heat for food processing is characterized by comprising a cooling box (1), wherein an inlet (2) is arranged below one side of the cooling box (1), a bamboo mat base plate (3) is arranged below the cooling box (1) and on the bottom surface of the inlet (2), a bottom cavity (4) is arranged between the bottom of the bamboo mat base plate (3) and the bottom in the cooling box (1), a rotating mechanism is arranged in the bottom cavity (4) and on one side far away from the inlet (2), the top surface of the rotating mechanism is higher than the top surface of the bamboo mat base plate (3), a honeycomb plate (5) is transversely arranged on the upper portion in the cooling box (1), a resin convex mirror (6) is arranged on the top of the honeycomb plate (5), a plurality of exhaust holes (7) are arranged on the resin convex mirror (6), a plurality of air outlet ports (8) are arranged on the top of the cooling box (1) and on one side far away from the inlet (2), air outlet port (8) are last to be connected with exhaust pipe one (9), exhaust pipe two (10) and exhaust pipe three (11) respectively, exhaust pipe one (9), exhaust pipe two (10) and the outer end of exhaust pipe three (11) all is connected with gas holder (12).

2. The baked food cooling device capable of recycling waste heat for food processing according to claim 1, wherein the honeycomb plate (5) is composed of a plurality of honeycomb blocks (13), wherein sponges (14) are embedded between any honeycomb blocks (13), hollow through holes (15) are formed in the middle of each honeycomb block (13), and the through holes (15) are used for communicating the lower part and the upper part of the cooling box (1).

3. The baked food cooling device capable of recovering waste heat for food processing as claimed in claim 1, wherein the surface of the resin convex mirror (6) is formed by filtering and processing metal powder, the first exhaust pipe (9), the second exhaust pipe (10) and the third exhaust pipe (11) are stainless pipes, the inner walls of the first exhaust pipe (9), the second exhaust pipe (10) and the third exhaust pipe (11) are coated with insulating coating, and the outer walls of the first exhaust pipe (9), the second exhaust pipe (10) and the third exhaust pipe (11) are coated with insulating coating.

4. The baked food cooling device capable of recovering waste heat for food processing according to claim 1, wherein a wind power return channel (16) is arranged outside the cooling box (1) and between the lower side of the cooling box (1) and the side far away from the inlet (2), a plurality of second pipelines (17) are arranged on the side of the wind power return channel (16) far away from the cooling box (1), the outer ends of the second pipelines (17) are connected with first pipelines (18), one ends of the first pipelines (18) far away from the second pipelines (17) are provided with funnels (19), and the pipe diameter of the first pipelines (18) is larger than that of the second pipelines (17).

5. The device for cooling the baked food for processing the food capable of recovering the waste heat according to claim 1, wherein a pipeline is connected to an air outlet of the air storage tank (12), and one end of the pipeline, which is far away from the air storage tank (12), is connected with an external food sterilization box, a fermentation box and an incubator.

6. The baked food cooling device capable of recycling waste heat for food processing according to claim 1, wherein a conveying mechanism is arranged at the top of the bamboo mat base plate (3) and on the side close to the inlet (2), the conveying mechanism comprises symmetrically arranged cylinders (20), the cylinders (20) are respectively fixed at two ends of one side of the top of the bamboo mat base plate (3), wherein fixing plates (21) are respectively arranged at the corresponding sides of the cylinders (20) at the two ends, a plurality of conveying roller shafts (22) are uniformly arranged between the fixing plates (21) at the two ends, and a half-arc concave surface (23) is arranged between any two adjacent conveying roller shafts (22) and on the side of the fixing plate (21).

7. The baked food cooling device capable of recycling waste heat for food processing according to claim 6, wherein the inner ends of the half-arc concave surfaces (23) are provided with first limiting grooves, the ends of the first limiting grooves, which are far away from the half-arc concave surfaces (23), are provided with second limiting grooves (24), the second limiting grooves (24) penetrate through the side edges of the cylinder (20) and extend into the cylinder (20), the second limiting grooves (24) are provided with return springs (25), the other ends of the return springs (25) are provided with drive plates (26), the ends of the drive plates (26), which are far away from the return springs (25), are provided with U-shaped grooves, the U-shaped grooves are respectively clamped with limiting rollers (27), and the limiting rollers (27) are located above the conveying roller shaft (22).

8. The device for cooling baked food capable of recovering waste heat for processing food according to claim 1, wherein the rotating mechanism comprises a rotating ring (28) of hollow structure type, a side ring (29) is disposed at the bottom of the rotating ring (28), a plurality of rotating support brackets (30) are disposed at the side of the rotating ring (28), the rotating support brackets (30) extend above the bamboo mat base plate (3) through the bottom cavity (4) and the bamboo mat base plate (3), and a first gear (31) is disposed at the top of the rotating ring (28) and near the hollow structure.

9. The device for cooling the baked food for food processing capable of recovering waste heat according to claim 8, it is characterized in that a motor (32) is arranged at one end of the bottom in the bottom cavity (4) and at the center of the inner side of the side ring (29), the output end of the motor (32) is connected with a main rotating shaft (33), the output end of the main rotating shaft (33) is connected with a gear four (34), a third gear (35) meshed with the fourth gear (34) is arranged on both sides above the fourth gear (34), a secondary rotating shaft (36) is respectively inserted into the middle part of the outer side of the third gear (35), a second gear (37) meshed with the first gear (31) is respectively arranged at one end of the secondary rotating shaft (36) far away from the third gear (35), the middle of the secondary rotating shaft (36) is sleeved with a cylinder (38), and the bottom of the cylinder (38) is fixed to the bottom in the bottom cavity (4) and located at two ends of the inner side of the side ring (29).