Moxibustion box capable of automatically controlling temperature

Abstract

The invention discloses an automatic temperature control moxibustion box which comprises a box body and a temperature control mechanism, circulation channels are formed in the middles of the left wall body and the right wall body of the box body, a moxa stick frame is inserted into the upper end of the interior of the box body, a filter cotton frame is inserted into the middle of the interior of the box body, and a contact piece is arranged in the middle of the lower end of the box body; the heat insulation sheets are rotationally connected to the lower end of the interior of the box body, the first gears are arranged at the front ends of the heat insulation sheets, the rack plate is slidably connected to the lower end of the front side of the box body, and the first gears are engaged with the rack plate. And the temperature change of each area of the contact piece is monitored in real time, and the irradiation area of the heating wire on the contact piece can be changed by changing the deflection angle of the heat insulation piece, so that the rapid and accurate temperature control effect is realized.

Description

Technical Field

[0001] The invention relates to the technical field of moxibustion boxes, in particular to a moxibustion box with automatic temperature control. Background Art

[0002] Moxibustion, also known as moxibustion therapy or moxibustion method, is a treatment method that uses moxa sticks and moxa cones made of moxa leaves to stimulate the acupuncture points or specific parts of the human body, adjust the disordered physiological and biochemical functions of the human body by stimulating the activity of meridian qi, and thus achieve the purpose of preventing and curing diseases. Due to the uncontrollable temperature of a single moxa stick, people have invented a moxibustion box to control the moxibustion temperature and achieve better prevention and treatment effects. Existing moxibustion boxes are mostly composed of heating wires and fans. The fan is arranged in the middle of the upper end of the box, and the heating wire is arranged inside the box. The inner wall of the box is plugged with a moxa stick rack and a replaceable filter cotton rack, which is convenient for placing moxa sticks and replacing filter cotton. A contact sheet is provided at the lower end of the box. When performing moxibustion, the lit moxa stick is inserted into the moxa stick rack, and then after the moxa stick rack is placed in place, the fan works to draw in external air , the external air is pushed by the fan and mixed with moxa smoke to pass through the filter cotton, and then is heated by the heating wire. The heating wire can heat the moxa smoke and the contact piece at the same time, so that the contact piece can better stimulate the acupuncture points. Finally, the moxa smoke passes through the small holes on the contact piece and acts on the acupuncture points of the human body. When the traditional moxibustion box is working, the box area is large and the position of the heating wire is fixed. The contact piece cannot be heated evenly, and the temperature in each area of ​​the contact piece cannot be monitored in real time, and there will be uneven heating of the contact piece. The moxa smoke is heated to a suitable temperature by the heating wire. When the temperature is adjusted, the temperature in the box will escape from the fan. The heating wire can quickly change the temperature of the moxa smoke by changing the current. Due to the irradiation of the heating wire, the temperature of the contact piece cannot be changed quickly, and the temperature control effect is poor. For this reason, we propose an automatic temperature control moxibustion box. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide an automatic temperature-controlled moxibustion box, which is equipped with a uniform heating device, can quickly and evenly heat the moxa smoke and the contact sheet, and monitor the temperature changes of various areas of the contact sheet in real time. It can also change the irradiation area of ​​the heating wire to the contact sheet by changing the deflection angle of the insulation sheet, thereby achieving a fast and accurate temperature control effect, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: an automatic temperature-controlled moxibustion box, comprising a box body and a temperature control mechanism;

[0005] Box body: The middle of the left and right walls are provided with circulation channels, the upper end of the box body is plugged with a moxa stick rack, the middle of the box body is plugged with a filter cotton rack, and the middle of the lower end of the box body is provided with a contact sheet;

[0006] Temperature control mechanism: It includes a heat insulation sheet, a gear and a rack plate. The heat insulation sheet is rotatably connected to the inner lower end of the box body. The gear is arranged at the front end of the heat insulation sheet. The rack plate is slidably connected to the front lower end of the box body. The gear is meshed with the rack plate to provide a basis for changing the irradiation area. A uniform heating device is provided to quickly and evenly heat the moxa smoke and the contact sheet, and monitor the temperature changes of various areas of the contact sheet in real time. The irradiation area of ​​the heating wire to the contact sheet can be changed by changing the deflection angle of the heat insulation sheet, thereby achieving a fast and accurate temperature control effect.

[0007] Furthermore, the temperature control mechanism also includes an electric push rod, which is arranged in the middle of the lower end of the front side of the box body, the input end of the electric push rod is electrically connected to the output end of the single-chip microcomputer, and the left end of the telescopic end of the electric push rod is fixedly connected to the middle of the lower end of the rack plate, providing stable drive for changing the irradiation area.

[0008] Furthermore, the temperature control mechanism also includes a heating component, which includes a screw rod 1, a mounting block 1, a gear 2 and a heating wire. The screw rod 1 is rotatably connected to the inner center of the box body, the mounting block 1 is slidably connected to the inner middle of the box body, the inner middle of the mounting block 1 is threadedly connected to the outer surface of the laterally adjacent screw rod 1, the gear 2 is arranged at the right end of the screw rod 1, the two gears 2 are meshed and connected, the heating wire is respectively arranged on the front and rear sides of the mounting block 1, and the input end of the heating wire is electrically connected to the output end of the single-chip microcomputer, providing a basis for uniform heating.

[0009] Furthermore, the heating component also includes a motor, which is arranged in the middle of the left side of the box body, the input end of the motor is electrically connected to the output end of the single-chip microcomputer, and the right end of the output shaft of the motor is fixedly connected to the left end of the upper screw rod 1, providing stable drive for uniform heating.

[0010] Furthermore, the temperature control mechanism also includes a monitoring component, which includes a screw rod 2, a mounting block 2, a pulley and a temperature sensor. The screw rod 2 is rotatably connected to the middle of the lower end of the box, the mounting block 2 is slidably connected to the lower end of the box, the inner middle of the mounting block 2 is threadedly connected to the outer surface of the screw rod 2, the lower gear 2 and the right end of the screw rod 2 are both provided with pulleys, the diameter of the upper pulley is larger than the diameter of the lower pulley, the two pulleys are connected by belt transmission, the temperature sensors are respectively arranged on the front and rear sides of the mounting block 2, and the temperature sensors are both electrically connected to the single-chip microcomputer in both directions, providing a basis for monitoring the temperature of different areas of the contact piece.

[0011] Furthermore, the temperature control mechanism also includes an insulation component, which includes a screw rod three, a limit block, an insulation sheet and a limit groove. The screw rod three is rotatably connected to the middle of the inner upper end of the box body, a hand wheel is provided at the front end of the screw rod three, the limit block is slidably connected to the middle of the top wall of the box body, the outer surface of the screw rod three is connected to the inner middle thread of the limit block, the insulation sheets are slidably connected to the left and right sides of the inner upper end of the box body, the limit grooves are opened at the upper end of the insulation sheet, the limit block is installed by matching the limit column at the lower end with the inner wall of the limit groove, and the position of the insulation sheet can be changed by turning the hand wheel to avoid the loss of temperature inside the box body.

[0012] Furthermore, the monitoring component also includes a fan, which is respectively arranged on the left and right sides of the top wall of the box body. The input end of the fan is electrically connected to the output end of the single-chip microcomputer, providing a basis for the driving and circulation of the moxa smoke.

[0013] Furthermore, it also includes a single-chip microcomputer, which is arranged in the middle of the upper end of the box body, and the input end of the single-chip microcomputer is electrically connected to an external power supply to provide a control effect for the moxibustion box.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the automatic temperature-controlled moxibustion box has the following advantages:

[0015] 1. The single chip microcomputer controls the operation of the motor. The motor makes the two screw rods rotate in opposite directions through the meshing of gear 2, driving the upper and lower groups of heating wires to move in opposite directions, making the heating work more uniform.

[0016] 2. The transmission of the pulley drives the second screw to rotate, thereby driving the temperature sensor to move left and right, making temperature monitoring more accurate. At the same time, by turning the hand wheel, the insulation sheet is located directly under the fan, which effectively prevents the heat inside the box from escaping from the fan to the outside, avoiding the loss of temperature inside the box and facilitating temperature control.

[0017] 3. The single chip microcomputer controls the operation of the electric push rod, which drives the heat insulation plate to rotate through the engagement of gear 1 and the rack plate. By changing the distance between the two heat insulation plates, the area of ​​the heating wire irradiated on the contact plate is changed, thereby quickly and accurately controlling the temperature of the contact plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the temperature control mechanism of the present invention;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the heating component of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the temperature control mechanism of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the thermal insulation component of the present invention.

[0023] In the figure: 1 box body, 2 circulation channel, 3 single chip microcomputer, 4 temperature control mechanism, 41 heat insulation sheet, 42 gear 1, 43 rack plate, 44 electric push rod, 45 heating component, 451 screw rod 1, 452 mounting block 1, 453 gear 2, 454 heating wire, 455 motor, 46 monitoring component, 461 screw rod 2, 462 mounting block 2, 463 pulley, 464 temperature sensor, 47 fan, 48 insulation component, 481 screw rod 3, 482 limit block, 483 insulation sheet, 484 limit slot, 5 moxa stick rack, 6 filter cotton rack, 7 contact sheet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-5 , This embodiment provides a technical solution: an automatic temperature-controlled moxibustion box, comprising a box body 1 and a temperature control mechanism 4;

[0026] Box body 1: The middle of the left and right walls are provided with circulation channels 2 for the circulation of moxa smoke. The upper end of the box body 1 is plugged with a moxa stick rack 5 for the placement of moxa sticks. The middle of the box body 1 is plugged with a filter cotton rack 6 for the placement and replacement of filter cotton. The middle of the lower end of the box body 1 is provided with a contact sheet 7, which is a metal copper sheet for heat conduction and better moxibustion work. The box body 1 also includes a single-chip microcomputer 3, which is arranged in the middle of the upper end of the box body 1. The input end of the single-chip microcomputer 3 is electrically connected to an external power supply to provide a control effect for the moxibustion box;

[0027] The temperature control mechanism 4 includes a heat insulating sheet 41, a gear 42 and a rack plate 43. The heat insulating sheet 41 is rotatably connected to the inner lower end of the box body 1. The surface of the heat insulating sheet 41 is coated with glass fiber for heat insulation. The gear 42 is arranged at the front end of the heat insulating sheet 41. The rack plate 43 is slidably connected to the front lower end of the box body 1. The gear 42 is meshed with the rack plate 43 to provide a basis for changing the irradiation area. The temperature control mechanism 4 also includes an electric push rod 44. The electric push rod 44 is arranged in the middle of the front lower end of the box body 1. The input end of the electric push rod 44 is electrically connected to the output end of the single-chip computer 3. The left end of the telescopic end of the electric push rod 44 is fixedly connected to the lower middle end of the rack plate 43 to provide a stable drive for changing the irradiation area. The temperature control mechanism 4 also includes a heating component 4 5. The heating component 45 includes a screw rod 451, a mounting block 452, a gear 453 and a heating wire 454. The screw rod 451 is rotatably connected to the inner center of the box body 1. The mounting block 452 is slidably connected to the inner middle of the box body 1. The inner middle of the mounting block 452 is threadedly connected to the outer surface of the laterally adjacent screw rod 451. The gear 453 is arranged at the right end of the screw rod 451. The two gears 453 are meshed and connected. The heating wire 454 is respectively arranged at the front and rear sides of the inner part of the mounting block 452. The input end of the heating wire 454 is electrically connected to the output end of the single-chip computer 3 to provide a basis for uniform heating. The heating component 45 also includes a motor 455. The motor 455 is arranged in the middle of the left side of the box body 1. The input of the motor 455 The end is electrically connected to the output end of the single-chip computer 3, the right end of the output shaft of the motor 455 is fixedly connected to the left end of the upper screw rod 451, providing stable drive for uniform heating work, the temperature control mechanism 4 also includes a monitoring component 46, the monitoring component 46 includes a screw rod 461, a mounting block 462, a pulley 463 and a temperature sensor 464, the screw rod 461 is rotatably connected to the middle of the lower end of the inner part of the box body 1, the mounting block 462 is slidably connected to the lower end of the inner part of the box body 1, the inner middle of the mounting block 462 is threadedly connected to the outer surface of the screw rod 461, the lower gear 453 and the right end of the screw rod 461 are both provided with pulleys 463, the diameter of the upper pulley 463 is larger than the diameter of the lower pulley 463, and the two pulleys 463 are connected by belts Transmission connection, temperature sensors 464 are respectively arranged on the front and rear sides of the interior of the second mounting block 462, and the temperature sensors 464 are bidirectionally electrically connected to the single-chip microcomputer 3, providing a basis for monitoring the temperature of different areas of the contact piece 7. The monitoring component 46 also includes a fan 47, which is respectively arranged on the left and right sides of the top wall of the box body 1. The input end of the fan 47 is electrically connected to the output end of the single-chip microcomputer 3, providing a basis for the drive and circulation of the moxa smoke. The temperature control mechanism 4 also includes an insulation component 48, and the insulation component 48 includes a screw rod 3 481, a limit block 482, an insulation sheet 483 and a limit groove 484. The screw rod 3 481 is rotatably connected to the middle of the upper end of the interior of the box body 1, and a hand wheel is provided at the front end of the screw rod 3 481. The limit block 482 is slidably connected to the middle of the top wall of the box body 1.The outer surface of the screw rod 481 is connected to the inner middle thread of the limit block 482. The insulation sheet 483 is slidably connected to the left and right sides of the upper end of the box body 1. The insulation sheet 483 is made of ceramic cotton board material, which can resist high temperature and can also play a role of heat preservation to prevent the internal temperature of the box body 1 from excessively overflowing from the fan 47. The limit groove 484 is opened at the upper end of the insulation sheet 483. The limit block 482 is installed in cooperation with the inner wall of the limit groove 484 through the limit column at the lower end. The position of the insulation sheet 483 can be changed by turning the hand wheel to prevent the loss of the internal temperature of the box body 1. A uniform heating device is provided to quickly and evenly heat the moxa smoke and the contact sheet 7, and monitor the temperature changes of various areas of the contact sheet 7 in real time. The irradiation area of ​​the heating wire 454 to the contact sheet 7 can also be changed by changing the deflection angle of the insulation sheet 41, thereby achieving a fast and accurate temperature control effect.

[0028] The working principle of the automatic temperature-controlled moxibustion box provided by the present invention is as follows: when performing moxibustion, pull out the moxa stick rack 5, insert the ignited moxa stick into the moxa stick rack 5, and then insert the moxa stick rack 5 back to its original position, the single-chip computer 3 controls the fan 47 to work, the fan 47 sucks in the outside air, and then mixes it with the moxa smoke. After the moxa smoke passes through the filter cotton in the filter cotton rack 6, the single-chip computer 3 controls the heating wire 454 to work, the heating wire 454 emits heat, and heats the moxa smoke to a suitable temperature. The moxa smoke passes through the holes above the contact sheet 7 and acts on the acupuncture points of the human body. At the same time, the heat emitted by the heating wire 454 passes through the gap between the insulation sheets 41 and acts on the surface of the contact sheet 7, heating the contact sheet 7, so that the moxibustion effect is better, and the excess moxa smoke is sucked in by the fan 47 again through the circulation channel 2. The upper and lower screw rods 451 rotate in opposite directions. As the screw rod 451 rotates, the upper mounting block 452 moves to the right, and the lower mounting block 452 moves to the left, and the corresponding heating wire 454 also moves synchronously. After the mounting block 452 moves to the appropriate position, the single chip microcomputer 3 controls the motor 455 to rotate in the forward direction. The output shaft of the motor 455 drives the upper screw rod 451 to rotate, and the upper gear 2 453 also rotates synchronously. Because the two gears 2 453 are meshed and connected, the lower gear 2 453 also rotates accordingly, and the lower screw rod 1 451 also rotates synchronously. At this time, the upper and lower screw rods 1 451 rotate in opposite directions. As the screw rod 1 451 rotates, the upper mounting block 1 452 moves to the right, and the lower mounting block 1 452 moves to the left, and the corresponding heating wire 454 also moves synchronously. Until the mounting block 1 452 moves to the appropriate position, the single chip microcomputer 3 controls the motor 455 to rotate in the reverse direction, and the two screw rods 1 451 also reverse synchronously, and the upper mounting block 1 452 The heating wire 454 is always repeatedly moved inside the housing 1, so that the heat generated by the heating wire 454 can evenly heat the moxa smoke and evenly irradiate the contact piece 7. At the same time, with the rotation of the gear 2 453 below, the upper pulley 463 also rotates synchronously. Because the diameter of the upper pulley 463 is larger than the diameter of the lower pulley 463, a transmission effect can be formed. Therefore, through the transmission of the belt, the lower pulley 463 also rotates synchronously, driving the screw rod 2 461 to rotate accordingly. With the rotation of the screw rod 2 461, the mounting block 2 462 moves to the left, driving the temperature sensor 464 to move to the left synchronously. When the motor 455 reverses, the screw rod 2 461 also rotates synchronously. The step is reversed, driving the installation block 2 462 and the temperature sensor 464 to move right synchronously, and so on. The temperature sensor 464 monitors the temperature changes along the way and sends the monitored temperature to the single-chip computer 3. After analyzing the data and comparing it with the set temperature, the single-chip computer 3 changes the temperature of the heating wire 454 and adjusts the deflection angle of the heat insulation sheet 41. The single-chip computer 3 controls the electric push rod 44 to work. When the temperature of the contact sheet 7 is too high, the telescopic end of the electric push rod 44 expands outward, driving the rack plate 43 to move left. Because the gear 1 42 is meshed with the rack plate 43, the gear 1 42 rotates synchronously, driving the heat insulation sheet 41 to rotate accordingly. The heat insulation sheet 41 deflects to the right, the gap between the two heat insulation sheets 41 becomes smaller, and the area of ​​the contact sheet 7 irradiated by the heating wire 454 also becomes smaller.The contact piece 7 can cool down quickly. When the temperature of the contact piece 7 is too low, the telescopic end of the electric push rod 44 expands outward, driving the rack plate 43 to move left, and the heat insulation sheet 41 also rotates accordingly. The heat insulation sheet 41 deflects to the left, and the gap between the two heat insulation sheets 41 becomes larger. The area of ​​the contact piece 7 irradiated by the heating wire 454 also becomes larger. The contact piece 7 can heat up quickly to achieve a fast and stable temperature control effect. At the same time, when heating, the hand wheel is turned. When the screw rod 481 rotates forward, the limit block 482 moves to At this time, the limiting column squeezes the limiting groove 484 outward, and the heat preservation sheet 483 moves outward until the heat preservation sheet 483 is located directly below the fan 47. At this time, the air and moxa smoke sucked by the fan 47 will enter the interior of the box 1 from the gap between the fan 47 and the heat preservation sheet 483. At the same time, the heat preservation sheet 483 can effectively prevent the heat inside the box 1 from escaping to the outside from the fan 47, avoiding the loss of the temperature inside the box 1, which is more conducive to the regulation of the temperature inside the box 1.

[0029] It is worth noting that the single chip microcomputer 3 disclosed in the above embodiment is an S7-200 single chip microcomputer, the electric push rod 44 is a JZN182 electric push rod, the heating wire 454 is a Ni80Cr20 heating wire, the motor 455 is a 57BYGH601-05AG6 motor, the temperature sensor 464 is a RKC-ST-50B-100-04 temperature sensor, and the fan 47 is a 9GA0812P4H001 fan. The single chip microcomputer 3 controls the operation of the electric push rod 44, the heating wire 454, the motor 455, the temperature sensor 464 and the fan 47, all of which adopt the methods commonly used in the prior art.

[0030] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A moxibustion box with automatic temperature control, characterized in that: It comprises a box body (1) and a temperature control mechanism (4); Box body (1): a circulation channel (2) is provided in the middle of the left and right walls thereof; a moxa stick holder (5) is inserted into the upper end of the box body (1); a filter cotton holder (6) is inserted into the middle of the box body (1); and a contact sheet (7) is provided in the middle of the lower end of the box body (1); The temperature control mechanism (4) comprises a heat insulating sheet (41), a gear one (42) and a rack plate (43), wherein the heat insulating sheet (41) is rotatably connected to the lower end of the interior of the box body (1), the gear one (42) is arranged at the front end of the heat insulating sheet (41), the rack plate (43) is slidably connected to the lower end of the front side of the box body (1), and the gear one (42) is meshingly connected to the rack plate (43).

2. The automatic temperature-controlled moxibustion box according to claim 1, characterized in that: It also comprises a single-chip computer (3), which is arranged in the middle of the upper end of the box body (1), and the input end of the single-chip computer (3) is electrically connected to an external power supply.

3. The automatic temperature-controlled moxibustion box according to claim 2, characterized in that: The temperature control mechanism (4) further comprises an electric push rod (44), which is arranged at the middle of the lower end of the front side of the box body (1), the input end of the electric push rod (44) is electrically connected to the output end of the single chip computer (3), and the left end of the telescopic end of the electric push rod (44) is fixedly connected to the middle of the lower end of the rack plate (43).

4. The automatic temperature-controlled moxibustion box according to claim 2, characterized in that: The temperature control mechanism (4) also includes a heating component (45), the heating component (45) including a screw rod (451), a mounting block (452), a gear (453) and a heating wire (454), the screw rod (451) is rotatably connected to the inner center of the box body (1), the mounting block (452) is slidably connected to the inner middle of the box body (1), the inner middle of the mounting block (452) is threadedly connected to the outer surface of the laterally adjacent screw rod (451), the gear (453) is arranged at the right end of the screw rod (451), the two gears (453) are meshed and connected, the heating wire (454) is respectively arranged at the front and rear sides of the inner part of the mounting block (452), and the input end of the heating wire (454) is electrically connected to the output end of the single-chip computer (3).

5. The automatic temperature-controlled moxibustion box according to claim 4, characterized in that: The heating component (45) further comprises a motor (455), which is arranged in the middle of the left side of the box body (1), the input end of the motor (455) is electrically connected to the output end of the single-chip computer (3), and the right end of the output shaft of the motor (455) is fixedly connected to the left end of the upper screw rod (451).

6. The automatic temperature-controlled moxibustion box according to claim 4, characterized in that: The temperature control mechanism (4) also includes a monitoring component (46), which includes a second screw rod (461), a second mounting block (462), a pulley (463) and a temperature sensor (464). The second screw rod (461) is rotatably connected to the middle of the lower end of the box body (1), the second mounting block (462) is slidably connected to the lower end of the box body (1), the middle of the interior of the second mounting block (462) is threadedly connected to the outer surface of the second screw rod (461), the second gear (453) below and the right end of the second screw rod (461) are both provided with pulleys (463), the diameter of the upper pulley (463) is larger than the diameter of the lower pulley (463), the two pulleys (463) are connected by belt transmission, the temperature sensors (464) are respectively arranged on the front and rear sides of the interior of the second mounting block (462), and the temperature sensors (464) are both bidirectionally electrically connected to the single-chip computer (3).

7. The automatic temperature-controlled moxibustion box according to claim 2, characterized in that: The monitoring component (46) further comprises a fan (47), wherein the fan (47) is respectively arranged on the left and right sides of the top wall of the box body (1), and the input end of the fan (47) is electrically connected to the output end of the single chip computer (3).

8. The automatic temperature-controlled moxibustion box according to claim 1, characterized in that: The temperature control mechanism (4) also includes a heat preservation component (48), which includes a screw rod (481), a limit block (482), a heat preservation sheet (483) and a limit groove (484). The screw rod (481) is rotatably connected to the middle of the upper end of the box body (1). A hand wheel is provided at the front end of the screw rod (481). The limit block (482) is slidably connected to the middle of the top wall of the box body (1). The outer surface of the screw rod (481) is threadedly connected to the middle of the inner part of the limit block (482). The heat preservation sheet (483) is slidably connected to the left and right sides of the upper end of the box body (1). The limit grooves (484) are arranged at the upper end of the heat preservation sheet (483). The limit block (482) is installed by matching the limit column at the lower end with the inner wall of the limit groove (484).

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