CN216769905U

CN216769905U - Energy-conserving efficient food quick freezing system

Info

Publication number: CN216769905U
Application number: CN202220361391.XU
Authority: CN
Inventors: 姜建业
Original assignee: Hebei Nuohao Mechanical Equipment Technology Co ltd
Current assignee: Hebei Nuohao Mechanical Equipment Technology Co ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-06-17
Anticipated expiration: 2032-02-22

Abstract

The utility model provides an energy-saving and efficient food quick freezing system which comprises a freezing box, a conveying device, a cold air unit, a first guide plate and a second guide plate. According to the energy-saving and efficient food quick freezing system provided by the utility model, through refitting the air outlet of the cold air unit, the wind direction of cold air blows along the direction of the frozen food inlet of the freezing tunnel, and then the cold air is guided by the first guide plate and the third guide plate to be just blown to the food at the just-inlet. Meanwhile, the cold air blown out by the cold air unit in the tunnel is guided by the second guide plate and the fourth guide plate, so that the cold air just forms an internal circulation in the freezing tunnel, the loss of cold energy is reduced, the utilization rate of the cold energy is improved, and the cost of food freezing is reduced.

Description

Energy-conserving efficient food quick freezing system

Technical Field

The utility model belongs to the technical field of food processing equipment, and particularly relates to an energy-saving and efficient food quick freezing system.

Background

In the food processing process, partial food needs to be frozen and then packaged and transported, so that on one hand, the freshness of the food can be ensured, and on the other hand, the product can be prevented from going bad and deforming, such as dumplings, wontons and the like. In the food processing process, the food needs to be put into a freezer for freezing. At present refrigerator is when using, through carrying the inside to the freezer with food to through being provided with the air-cooler in freezer inside, blow cold wind through the fan towards food direction continuously so as to reach the frozen effect of food. However, by adopting the freezing mode, cold air can be dispersed to other positions after passing through food, and the cold air cannot be recycled, so that the consumption of refrigeration equipment is overlarge, and the cost of the food freezing process is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an energy-saving and efficient food quick freezing system, and aims to solve the problem that the processing cost is high due to the fact that refrigeration equipment is excessively consumed in the conventional food freezing process.

In order to achieve the purpose, the utility model adopts the technical scheme that: an energy-saving and efficient food quick freezing system is provided, which comprises:

a freezing box, the interior of which is provided with a freezing tunnel;

the conveying device is connected with the freezing box and is used for conveying the food from the feeding port of the freezing tunnel to the discharging port of the freezing tunnel;

the cold air unit is fixedly arranged in the freezing box and is positioned above the freezing tunnel, and an air outlet of the cold air unit is arranged along the length direction of the freezing tunnel;

the first guide plate is obliquely arranged at the feed inlet of the freezing tunnel and is positioned above the feed inlet, and the first guide plate is obliquely arranged from top to bottom in a direction away from the feed inlet;

the second guide plate is obliquely arranged at the discharge port of the freezing tunnel and is positioned below the discharge port, and the second guide plate is obliquely arranged from top to bottom in the direction away from the discharge port.

In one possible implementation, the air cooling unit includes:

a cooling device arranged above the freezing box and used for supplying cold air into the freezing tunnel;

circulating fan sets up the inside in freezing tunnel, and is located the top in freezing tunnel, circulating fan's air outlet orientation is followed the length direction in freezing tunnel sets up for blow cold air and be in freezing tunnel inner loop.

In a possible implementation manner, the number of the circulating fans is multiple, and the multiple circulating fans are arranged at intervals along the length direction of the freezing tunnel.

In a possible implementation manner, a third guide plate is further arranged in the freezing box, the third guide plate is arranged on one side, close to the feeding hole, of the cold air unit, and the third guide plate inclines towards one side, close to the feeding hole, from top to bottom.

In a possible implementation manner, a fourth guide plate is further arranged in the freezing box, the fourth guide plate is arranged on one side, close to the discharge port, of the cold air unit, and the fourth guide plate inclines towards one side, close to the discharge port, of the discharge port from top to bottom.

In one possible implementation, the transmitting device includes:

the rotating roller is rotatably arranged at the feed inlet of the freezing tunnel and is positioned on the outer side of the freezing box;

the driven roller is rotatably arranged at the discharge port of the freezing tunnel and is positioned inside the freezing tunnel;

the conveying belt is arranged between the rotating roller and the driven roller and is used for conveying food;

and the driving end of the driving piece is in transmission connection with the rotating roller and is used for driving the rotating roller to rotate.

In one possible implementation manner, a blanking pipeline is arranged at the discharge port of the freezing tunnel, the feed end of the blanking pipeline is located below the driven roller, and the discharge end of the blanking pipeline is located on the outer side of the freezing box.

In a possible implementation manner, the blanking pipeline is arranged on the freezing box from the feeding end of the blanking pipeline to the discharging end of the blanking pipeline in a downward inclined mode.

In a possible implementation manner, a first flexible wind-blocking curtain is arranged inside the blanking pipeline, one end of the first flexible wind-blocking curtain is fixedly installed on the upper side wall inside the blanking pipeline, the other end of the first flexible wind-blocking curtain is in free lap joint with the lower side wall inside the blanking pipeline, a second flexible wind-blocking curtain is arranged on the first guide plate, one end of the second flexible wind-blocking curtain is fixedly installed on the first guide plate, and the other end of the second flexible wind-blocking curtain is in free lap joint with the conveying device.

In a possible implementation mode, the feed inlet of the freezing tunnel is further provided with a protective table, an opening used for allowing food to fall into the conveying device is arranged above the protective table, a third flexible wind-blocking curtain is arranged around the opening, and the third flexible wind-blocking curtain is detachably mounted on the protective table.

Compared with the prior art, the scheme shown in the embodiment of the application has the advantages that the freezing tunnel arranged along the horizontal direction is arranged inside the freezing box, the feeding hole and the discharging hole which are communicated with the outside are respectively formed in the freezing box, and the conveying device used for conveying food is further arranged between the feeding hole and the discharging hole. According to the utility model, the cold air unit is arranged in the freezing tunnel, the air outlet of the cold air unit is arranged along the horizontal direction, the wind direction of the cold air changes after passing through the inner wall of the freezing box and flows to the first guide plate, the cold air blows on food on the conveying device after passing through the first guide plate and moves to the bottom surface of the freezing tunnel, and the wind direction of the cold air guided by the first guide plate has a certain angle with the bottom surface of the freezing tunnel, so that the cold air can flow to the second guide plate after passing through the bottom surface of the freezing tunnel, and flows to the top of the freezing tunnel again after being guided by the second guide plate and returns to the air inlet of the cold air unit. The cold air can circularly flow in the freezing tunnel along the clockwise or anticlockwise direction, the cold air can be recycled, and the loss of the refrigeration equipment is reduced, so that the processing cost in the food freezing process is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an energy-saving and efficient food quick-freezing system provided by an embodiment of the utility model;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

fig. 3 is a schematic structural diagram of a protection platform according to an embodiment of the present invention.

Description of reference numerals:

1. a freezer; 11. a first guide plate; 12. a second guide plate; 13. a third guide plate; 14. a fourth guide plate; 2. a conveying device; 21. a rotating roller; 22. a driven roller; 23. a conveyor belt; 24. a drive member; 3. a cold air unit; 31. a cooling device; 32. a circulating fan; 4. a blanking pipe; 5. a first flexible wind-shield curtain; 6. a second flexible wind-shield curtain; 7. a protection platform; 8. and a third flexible wind-shield curtain.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1, a fast freezing system for food with high efficiency and energy saving provided by the present invention will now be described. Energy-conserving efficient food quick freezing system includes freezer 1, conveyer 2, cold wind unit 3, first deflector 11 and second deflector 12. A freezing tunnel is arranged in the freezing box 1; the conveying device 2 is connected with the freezing box 1 and is used for conveying the food from the feeding hole of the freezing tunnel to the discharging hole of the freezing tunnel; the cold air unit 3 is fixedly arranged in the freezing box 1 and is positioned above the freezing tunnel, and an air outlet of the cold air unit 3 faces the direction along the length direction of the freezing tunnel; the first guide plate 11 is obliquely arranged at the feed inlet of the freezing tunnel and is positioned above the feed inlet, and the first guide plate 11 is obliquely arranged from top to bottom in the direction away from the feed inlet; the second guide plate 12 is obliquely arranged at the discharge port of the freezing tunnel and is positioned below the discharge port, and the second guide plate 12 is obliquely arranged from top to bottom in the direction away from the discharge port.

Compared with the prior art, the energy-saving and efficient food quick freezing system provided by the embodiment has the advantages that the freezing tunnel arranged along the horizontal direction is arranged inside the freezing box 1, the freezing tunnel and the feeding port and the discharging port communicated with the outside are respectively arranged on the freezing box 1, and the conveying device 2 used for conveying food is further arranged between the feeding port and the discharging port. According to the utility model, the cold air unit 3 is arranged in the freezing tunnel, the air outlet of the cold air unit 3 is arranged along the horizontal direction, the wind direction of the cold air changes after passing through the inner wall of the freezing box 1 and flows to the first guide plate 11, the cold air blows on food on the conveying device 2 after passing through the first guide plate 11 and moves to the bottom surface of the freezing tunnel, and the wind direction of the cold air guided by the first guide plate 11 forms a certain angle with the bottom surface of the freezing tunnel, so that the cold air can flow to the second guide plate 12 after passing through the bottom surface of the freezing tunnel, and flows to the top of the freezing tunnel again after being guided by the second guide plate 12 and returns to the air inlet of the cold air unit 3. The cold air can circularly flow in the freezing tunnel along the clockwise or anticlockwise direction, the cold air can be recycled, and the loss of the refrigeration equipment is reduced, so that the processing cost in the food freezing process is reduced.

Optionally, in this embodiment, the first guide plate 11 and the second guide plate 12 are disposed on the side wall of the freezing tunnel at an angle of 45 ° in the horizontal direction.

Alternatively, in this embodiment, the bottom surface of the freezing tunnel is disposed obliquely along the horizontal direction, and the drain pipe is disposed at the bottom of the bottom surface of the freezing tunnel, so that the water in the freezing tunnel can be automatically drained from the freezing tunnel.

Optionally, in this embodiment, the bottom surface and the side surface of the freezing tunnel are both provided with waterproof layers for waterproofing, the waterproof layers may be nylon plates, and the nylon plates are laid on the bottom and the side surface of the freezing tunnel.

Optionally, in this embodiment, the air outlet of the air cooling unit 3 blows air towards the feed inlet of the freezing tunnel.

In some embodiments, the air cooling unit 3 may be configured as shown in fig. 1. Referring to fig. 1, the cooling unit 3 includes a cooling device 31 and a circulation fan 32. A cooling device 31 is arranged above the freezing box 1 and used for supplying cold air into the freezing tunnel; the circulating fan 32 is arranged inside the freezing tunnel and above the freezing tunnel, and an air outlet of the circulating fan 32 faces the length direction of the freezing tunnel and is used for blowing cold air to circulate in the freezing tunnel. The cooling device 31 is a refrigeration device, and can convey refrigerated gas or medium to the air inlet of the circulating fan 32, so that the air temperature at the air inlet of the circulating fan 32 is reduced and cold air is formed after the air passes through the circulating fan 32. The cooling air can flow in a directional way through the circulating fan 32 and can be recycled in the freezing tunnel.

Alternatively, in the present embodiment, the circulation fan 32 is an axial flow fan. It can be ensured that the cold air can still move in a straight line direction after passing through the circulating fan 32.

Specifically, in this embodiment, a temperature sensor is further disposed in the freezing tunnel, the temperature sensor is further electrically connected to a controller, the controller is electrically connected to the cooling device 31 for controlling the operating state of the cooling device 31, and when the temperature in the freezing tunnel reaches a preset requirement, the controller controls the cooling device 31 to be turned off, so as to save the loss of the cooling device 31.

In some embodiments, the circulator blower 32 may be configured as shown in FIG. 1. Referring to fig. 1, the number of the circulation fans 32 is plural, and the plural circulation fans 32 are disposed at intervals along the length direction of the freezing tunnel. The plurality of circulating fans 32 are arranged at intervals, and the air outlets of the circulating fans 32 at the rear parts of the two adjacent circulating fans 32 are aligned with the air outlet of the circulating fan 32 at the front part, so that the flowing speed of cold air can be increased, and the cold air can fully flow in the freezing tunnel in a circulating manner.

In some embodiments, the freezer 1 described above may be configured as shown in fig. 1. Referring to fig. 1, a third guide plate 13 is further arranged in the freezer 1, the third guide plate 13 is arranged on one side of the cold air unit 3 close to the feed opening, and the third guide plate 13 inclines to one side close to the feed opening from top to bottom. The third deflector 13 is arranged along the vertical direction at an included angle of 45 degrees, and the first deflector 11 and the third deflector 13 are arranged perpendicular to each other. When can making cold wind blow to third deflector 13 along the horizontal direction on, the direction through third deflector 13 can make the flow direction of cold wind change and flow to first deflector 11 along the direction that is on a parallel with first deflector 11 on, can prevent that there is the angle in the flow direction of cold wind and first deflector 11 to lead to cold wind to change the unable bottom in freezing tunnel to the bottom of changing in the flow direction behind first deflector 11. The cold air can be sufficiently moved to the bottom of the freezing tunnel along the guide of the first guide plate 11.

In some embodiments, the freezer 1 described above may be configured as shown in fig. 1. Referring to fig. 1, a fourth guide plate 14 is further disposed in the freezer 1, the fourth guide plate 14 is disposed on one side of the cold air unit 3 close to the discharge port, and the fourth guide plate 14 is inclined from top to bottom toward one side close to the discharge port. The fourth guide plate 14 is arranged at an included angle of 45 degrees along the vertical direction, and the second guide plate 12 and the fourth guide plate 14 are arranged perpendicular to each other. Can make cold wind carry to fourth deflector 14 time through second deflector 12, can make the flow direction of cold wind carry to the air intake department of cold wind unit 3 along the horizontal direction through the direction of fourth deflector 14 and the direction of freezing tunnel top surface, can fully lead to the flow direction of cold wind, reduce the loss of cold wind at the flow in-process.

In some embodiments, the conveyor 2 may be configured as shown in FIG. 1. Referring to fig. 1, the conveyor 2 includes a rotating roller 21, a driven roller 22, a conveyor belt 23, and a driving member 24. The rotating roller 21 is rotatably arranged at the feed inlet of the freezing tunnel and is positioned at the outer side of the freezing box 1; the driven roller 22 is rotatably arranged at the discharge port of the freezing tunnel and is positioned inside the freezing tunnel; a conveyor belt 23 disposed between the rotating roller 21 and the driven roller 22 for conveying the food; the driving end of the driving member 24 is in transmission connection with the rotating roller 21 and is used for driving the rotating roller 21 to rotate. The rotating roller 21 and the driving part 24 are located on the outer side of the freezing box 1, a part of the conveying belt 23 is located on the outer side of the freezing box 1, food can be conveniently placed on the conveying belt 23, the driven roller 22 is rotatably arranged inside the freezing box 1 and is horizontally arranged with the rotating roller 21 at intervals, the axes of the driven roller 22 and the rotating roller 21 are arranged in parallel, the conveying belt 23 is of an annular structure and is wound between the rotating roller 21 and the driven roller 22, and the food can enter the freezing tunnel from the outer side of the freezing box 1 from a feeding hole of the freezing tunnel to be frozen and can be output from a discharging hole of the freezing tunnel.

Alternatively, in this embodiment, the driving member 24 is a motor, and is in transmission connection with the rotating roller 21 through a belt.

In some embodiments, the freezing tunnel may be configured as shown in fig. 1 and 2. Referring to fig. 1 and 2 together, a blanking pipeline 4 is arranged at the discharge port of the freezing tunnel, the feed end of the blanking pipeline 4 is positioned below the driven roller 22, and the discharge end of the blanking pipeline 4 is positioned outside the freezing box 1. The oral area of blanking pipeline 4's feed end department is located driven round department, and food on the conveyer belt 23 can fall to the blanking pipeline 4 inside through the feed end department after the follow driving wheel to carry to the outside of freezer 1 through blanking pipeline 4. The frozen food is convenient to collect. Meanwhile, the food is output from the freezing tunnel through the blanking pipeline 4, so that the cold air output through the conveyor belt 23 can be prevented from flowing to the outer side of the freezing tunnel along with the conveyor belt 23, and the waste of the cold air is avoided.

In some embodiments, the blanking pipe 4 may be configured as shown in fig. 1 and 2. Referring to fig. 1 and 2 together, the blanking pipeline 4 is arranged on the freezing box 1 in a downward inclination manner from the feeding end of the blanking pipeline 4 to the discharging end of the blanking pipeline 4. The inclined arrangement of the blanking pipeline 4 can facilitate food to slide out from the discharging end of the blanking pipeline 4 according to the gravity of the food when the food falls into the blanking pipeline 4. Preventing food from clogging inside the blanking duct 4.

Optionally, in this embodiment, a baffle is further disposed at the feeding end of the blanking pipe 4, and the baffle is disposed on the blanking pipe 4 along the vertical direction and is located on the side of the feeding end of the blanking pipe 4 away from the driven roller 22. The baffle plate is arranged to effectively guide the food to fall into the blanking pipeline 4 from the conveyor belt 23.

Optionally, in this embodiment, an extension plate is provided below the driven roller 22, and is connected to the feeding end of the drop pipe 4 for preventing the food from falling to the bottom of the freezing tunnel.

In some embodiments, the blanking pipe 4 may be configured as shown in fig. 1 and 2. Referring to fig. 1 and 2 together, a first flexible wind-blocking curtain 5 is arranged inside the blanking pipe 4, one end of the first flexible wind-blocking curtain 5 is detachably mounted on the upper side wall inside the blanking pipe 4, and the other end of the first flexible wind-blocking curtain is freely lapped on the lower side wall inside the blanking pipe 4. First flexible wind-break curtain 5 adopts flexible plastics or resin material goods, can make food fall from blanking pipeline 4 according to the deformation of first flexible wind-break curtain 5 when food process, is provided with the slot in blanking pipeline 4's inside wall top, can dismantle in the slot and be provided with the picture peg, and 5 one end fixed mounting of first flexible wind-break curtain are on the picture peg, and the other end inclines and the overlap joint is on blanking pipeline 4's lower lateral wall to the discharge end direction. The inserting plate is inserted into the slot and fixed on the blanking pipeline 4 through a bolt. The installation and the dismantlement with the picture peg are convenient to be convenient for first flexible windshield 5 to pull down from blanking pipe 4 and wash. When the outside air flows into the blanking pipe 4, the first flexible wind screen 5 can be used for plugging. The first flexible wind screen 5 is arranged to prevent outside air from flowing into the interior of the freezing tunnel through the blanking pipe 4 to affect the temperature in the freezing tunnel. The first guide plate 11 is provided with a second flexible wind-shielding curtain 6, one end of the second flexible wind-shielding curtain 6 is detachably mounted on the first guide plate 11, and the other end of the second flexible wind-shielding curtain is freely lapped on the conveying device 2. The second flexible wind-blocking curtain 6 is detachably mounted on one side, far away from the feeding hole, of the first guide plate 11 through bolts, extends downwards along the inclined direction of the first guide plate 11 and is attached to the conveying belt 23 of the conveying device 2, and therefore heat exchange between the cold air and the outside through a gap between the first guide plate 11 and the conveying belt 23 can be prevented. The second flexible wind-shield curtain 6 is made of flexible plastics or resin, so that the food can be prevented from being damaged when passing through.

Specifically, in this embodiment, cold wind can pass through the oral area of blanking pipeline 4 feed end department after second deflector 12, and the flow direction of cold wind is tangent with the oral area of blanking pipeline 4 feed end department to there is the negative pressure at the feed end department that makes blanking pipeline 4, can inhale the inside temperature that influences freezing tunnel through blanking pipeline 4 with external gas.

Optionally, in this embodiment, the number of the first flexible wind-blocking curtains 5 is plural, and the plural first flexible wind-blocking curtains 5 are arranged at intervals along the length direction of the blanking pipe 4.

In some embodiments, the freezer 1 may be configured as shown in fig. 1 and 3. Referring to fig. 1 and 3 together, a protective table 7 is further arranged at the feed inlet of the freezing tunnel, an opening used for food to fall onto the conveying device 2 is arranged above the protective table 7, a third flexible wind-shielding curtain 8 is arranged around the opening, and the third flexible wind-shielding curtain 8 is detachably arranged on the protective table 7. The bottom of the protective table 7 is provided with a travelling wheel which is convenient for installing the protective table 7 on the freezing box 1, and an opening is arranged above the protective table 7 and is positioned above the conveyor belt 23 in the conveyor device 2. The food can be made to fall through the opening directly onto the conveyor belt 23 and be conveyed via the conveyor belt 23 into the freezer compartment 1. And a third flexible wind screen 8 is arranged at the opening, so that the heat exchange between the cold air of the freezing tunnel and the outside can be prevented again.

Optionally, in this embodiment, the third flexible wind-blocking curtain 8 is detachably disposed on the protection platform 7, so that the third flexible wind-blocking curtain 8 can be conveniently detached and then cleaned. Be provided with the mounting bracket at the opening part, the overlap joint of mounting bracket is at the opening part of protection platform 7, and the appearance of mounting bracket sets up along open-ended appearance, and the flexible wind-break curtain 8 fixed mounting of third just encloses the inner circle setting of establishing at the mounting bracket on the mounting bracket. The third flexible wind-blocking curtain 8 can be detached from the protective table 7 by detaching the mounting frame, and the mounting frame is convenient to operate and simple to use.

Optionally, in this embodiment, a limiting protrusion is disposed on one side of the mounting frame, which is close to the protection table 7, and a limiting hole for accommodating the limiting protrusion is disposed on the protection table 7 and used for positioning the position of the mounting frame.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An energy-saving and efficient food quick freezing system is characterized by comprising:

a freezing box, the interior of which is provided with a freezing tunnel;

2. The energy efficient rapid food freezing system according to claim 1, wherein said air cooler unit comprises:

3. The energy-saving and efficient food quick-freezing system according to claim 2, wherein the number of the circulating fans is plural, and the plural circulating fans are arranged at intervals along the length direction of the freezing tunnel.

4. The energy-saving and efficient food quick-freezing system according to claim 1, wherein a third guide plate is further disposed in the freezing box, the third guide plate is disposed on a side of the cooling air unit near the feed opening, and the third guide plate is inclined from top to bottom toward a side near the feed opening.

5. The energy-saving and efficient food quick-freezing system according to claim 1, wherein a fourth guide plate is further disposed in the freezing box, the fourth guide plate is disposed on a side of the cold air unit close to the discharge port, and the fourth guide plate is inclined from top to bottom toward a side close to the discharge port.

6. The energy efficient food quick freezing system of claim 1 wherein said conveyor comprises:

7. The energy-saving and efficient food quick freezing system according to claim 6, wherein a discharge port of the freezing tunnel is provided with a blanking pipeline, a feed end of the blanking pipeline is positioned below the driven roller, and a discharge end of the blanking pipeline is positioned outside the freezing box.

8. An energy efficient rapid food freezing system according to claim 7 wherein said down flow duct is inclined downwardly from the inlet end of said down flow duct to the outlet end of said down flow duct on said freezer compartment.

9. The energy-saving and efficient food quick freezing system according to claim 8, wherein a first flexible wind-shielding curtain is arranged inside the blanking pipe, one end of the first flexible wind-shielding curtain is detachably mounted on the upper side wall inside the blanking pipe, the other end of the first flexible wind-shielding curtain is freely lapped on the lower side wall inside the blanking pipe, a second flexible wind-shielding curtain is arranged on the first guide plate, one end of the second flexible wind-shielding curtain is detachably mounted on the first guide plate, and the other end of the second flexible wind-shielding curtain is freely lapped on the conveying device.

10. The energy-saving and efficient food quick freezing system according to claim 1, wherein a protective table is further arranged at the feed inlet of the freezing tunnel, an opening for food to fall onto the conveying device is arranged above the protective table, a third flexible wind screen is arranged around the opening, and the third flexible wind screen is detachably arranged on the protective table.