Thermal insulation board

Abstract

The present invention provides a heat preservation board for food heat preservation, which comprises a first board body and a second board body having heating elements. A first bracket is hinged to the first board body, and the first bracket can swing between a first folding position and a first extended position. A second bracket is hinged to the second board body, and the second bracket can swing between a second folding position and a second extended position. An extension bracket, with the first end hinged to the second bracket and the second end capable of being hinged to the first board body. One end of the first bracket away from the first hinge axis is locked to the second board body through a locking member. The second board body can be fixed above the first board body by the extended first bracket, second bracket and extension bracket. When the locking member is separated from the second board body, the second bracket is in the second folding position, and the extension bracket is hinged to the first board body, the second board body can be laid flat and linked with the first board body. The first board body and the second board body can be switched between stacking and laying flat, making full use of the height space and horizontal space according to the actual use scenario, with strong adaptability.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and particularly to a warming plate for food warming. Background Art

[0002] When the temperature is low, the dishes on the dining table are likely to cool down, which is not conducive to eating. The food warming plate came into being, and its heat source is usually an electric heating tube or heating wire placed under a ceramic plate or a glass plate. A power input interface, a power switch, a power indicator light and a temperature adjustment device are usually arranged at the border of the food warming plate. The temperature adjustment device is usually a knob, a slide button or a button. Some food warming plates are constant-power warming plates without an external temperature adjustment device.

[0003] Currently, the household food warming plates on the market are basically single-layered and usually can only be placed flat on the dining table directly, with limited usage space. When there are many dishes, it is difficult to place more dishes at the same time, and it is difficult to meet the usage needs of large-usage families. Summary of the Invention

[0004] The purpose of the present invention is to provide a warming plate that makes full use of space and has strong adaptability.

[0005] To achieve the above purpose, the warming plate of the present invention includes a first plate body with a first heating element and a second plate body with a second heating element.

[0006] The length direction of the warming plate is the length direction of the first plate body and the second plate body, and the width direction of the warming plate is the width direction of the first plate body and the second plate body.

[0007] A bracket, including a first bracket, a second bracket and an extension bracket.

[0008] The first bracket is hinged to the first side of the first plate body along the length direction through a first hinge shaft extending along the width direction, and the first bracket can swing between a first folding position close to the lower side of the first plate body and a first extended position away from the lower side of the first plate body.

[0009] The second bracket is hinged to the lower side of the second plate body through a second hinge shaft extending along the width direction, and the second bracket can swing between a second folding position close to the lower side of the second plate body and a second extended position away from the lower side of the second plate body.

[0010] The extension bracket, the first end of which is hinged to the end of the second bracket away from the second hinge shaft, and the second end of which can be hinged to the second side of the first plate body along the length direction.

[0011] One end of the first bracket away from the first hinge shaft is locked to the first side of the second plate body along the length direction through a locking member, and the first side of the second plate body along the length direction is closer to the first hinge shaft than its second side.

[0012] When the second support is in the second extended position and is locked with the extension support as a whole, the extension support is hinged to the first plate body, and the first support is in the first extended position and the locking member is locked with the second plate body, the second plate body is fixed above the first plate body.

[0013] When the locking member is separated from the second plate body, the second support is in the second folded position, and the extension support is hinged to the first plate body, the second plate body can be laid flat and linked with the first plate body.

[0014] It can be seen that the second plate body can be installed above the first plate body in a stacked manner by using the supports, so as to make the most of the vertical space of the tabletop and facilitate placing more dishes on the limited tabletop. In addition, the second plate body can be laid flat on one side of the first plate body along the length direction by folding the supports, expanding the horizontal heat preservation area. The settings of the first support, the second support and the extension support enable the first plate body and the second plate body to switch between stacking and laying flat, making full use of the height space and the horizontal space according to the actual use scenarios, with strong adaptability.

[0015] Furthermore, a set of supports are respectively provided on both sides of the heat preservation plate along the width direction. That is, a set of first supports, second supports and extension supports are respectively provided on both sides of the heat preservation plate along the width direction. This is beneficial to improving the overall structural strength and the stability of the second plate body during stacking.

[0016] Furthermore, the locking member is provided at one end of the first support away from the first hinge axis; the first end of the extension support is hinged to the second support through a third hinge axis extending along the width direction; the second end of the extension support is hinged to the first plate body through a fourth hinge axis extending along the width direction. This is beneficial to improving the torsional strength between the extension support and the second support and the structural stability in the stacked state.

[0017] Furthermore, the fourth hinge axis is installed on the first plate body; the second end of the extension support is hook-shaped and detachably connected to the fourth hinge axis. After the extension support is separated from the fourth hinge axis, the first plate body can be used alone, further improving the flexibility of use. It is also beneficial to reducing the assembly difficulty and increasing the assembly speed.

[0018] Furthermore, a first groove for accommodating the first support is provided on the lower side of the first plate body, and when the first support is in the first folded position, it is located in the first groove; a second groove for accommodating the second support is provided on the lower side of the second plate body, and when the second support is in the second folded position, it is located in the second groove. This is beneficial to saving space and reducing the maximum height of the heat preservation plate.

[0019] Furthermore, a support shaft extending in the width direction is provided on the second plate body; the support shaft is farther from the first side of the second plate body in the length direction than the second hinge shaft; when the second bracket is in the second extended position, it abuts against the support shaft. By providing a limiting effect on the second bracket through the support shaft, only by improving the structural strength of the support shaft can the support reliability be greatly improved, without the need to additionally and significantly strengthen the remaining fittings on the second plate body, which has a simple and effective structure and low cost.

[0020] Furthermore, a first chute arranged in the width direction is provided at one end of the first bracket close to the first hinge shaft, and a return spring and a first positioning pin with a spherical surface are installed in the first chute from the inside out in the width direction; a positioning hole is provided on the first plate body, and the diameter of the positioning hole is smaller than the diameter of the spherical surface; when the first bracket is in the first extended position, the spherical surface abuts against the positioning hole. Through the abutment of the spherical surface of the first positioning pin and the positioning hole, the first bracket can be automatically positioned when it swings to the first extended position, and the return spring provides a predetermined positioning torque for the first bracket. As long as the positioning torque is overcome and the first positioning pin is retracted, the first bracket can be directly moved to the first folded position, which is convenient and fast.

[0021] Furthermore, a slideway extending in the width direction is provided at one end of the first bracket far from the first hinge shaft;

[0022] The locking member includes a rotation prevention pin sliding along the slideway and a first handle fixed to the rotation prevention pin, and the cross-sectional shape of the rotation prevention pin corresponds to and cooperates with the cross-sectional shape of the slideway; a locking hole corresponding to the cross-sectional shape of the rotation prevention pin is provided on the second plate body. The cross-sectional shape of the rotation prevention pin corresponds to and cooperates with the cross-sectional shapes of the slideway and the locking hole respectively. When the first bracket is locked to the second plate body through the locking member, it prevents the first bracket from rotating relative to the second plate body around the width direction, which is beneficial to improving the structural stability of the insulation board in the stacked state.

[0023] Furthermore, a receiving portion for rotatably cooperating with the fourth hinge shaft is provided at the second end of the extension bracket, and a notch allowing the fourth hinge shaft to enter the receiving portion from the outside is provided, and the notch is located on the first side of the extension bracket in its width direction; when the second plate body is laid flat and linked with the first plate body, the notch faces downward. When the second plate body is laid flat and linked with the first plate body, only by lifting the second plate body upward can the first plate body be separated from the second plate body, and the operation is simple and fast. Since the notch faces downward, the extension bracket prevents the second plate body from having a relative displacement with the first plate body in the horizontal direction.

[0024] Furthermore, a blocking portion is provided at one end of the extension bracket close to the third hinge axis; a second sliding groove extending along the length direction of the second bracket is provided at one end of the second bracket away from the second hinge axis; a second positioning pin is slidably mounted in the second sliding groove between a locking position and an unlocking position; when the second plate body is fixed above the first plate body, the second side of the extension bracket along its width direction abuts against the first plate body, and when the second positioning pin slides to the locking position, it abuts against the blocking portion. This is beneficial to improving the structural stability of the insulation board in the stacked state. Description of the Drawings

[0025] Figure 1 is a perspective view of the present invention in the stacked state;

[0026] Figure 2 is another perspective view of the present invention in the stacked state;

[0027] Figure 3 is a top view of the present invention in the flat state;

[0028] Figure 4 is a perspective view of the present invention in the flat state;

[0029] Figure 5 is Figure 2 a cross-sectional view taken along line A-A of

[0030] Figure 6 is Figure 5 a state diagram when the second positioning pin is slid to the unlocking position;

[0031] Figure 7 is Figure 5 a cross-sectional view taken along line B-B of

[0032] Figure 8 is a perspective view of the first bracket provided with a locking member;

[0033] Figure 9 is another perspective view of the first bracket provided with a locking member;

[0034] Figure 10 is a perspective view of the present invention in the storage and folding state. Embodiment

[0035] The present invention will be described in detail below with reference to the accompanying drawings.

[0036] As Figures 1 to 5 shown, the insulation board 1000 includes a first plate body 100 having a first heating element (not shown in the figure) and a second plate body 200 having a second heating element (not shown in the figure). The heating element and its installation method are prior arts and will not be elaborated here. The heating element can be one or more of an aluminum foil composite heating wire, a carbon fiber heating wire, a ceramic heating sheet, a metal electrothermal film, and a metal heating wire.

[0037] The length direction 001 of the heat preservation board 1000 is the length direction of the first plate body 100 and the second plate body 200, and the width direction 002 of the heat preservation board 1000 is the width direction of the first plate body 100 and the second plate body 200.

[0038] The bracket 300 includes a first bracket 310, a second bracket 320 and an extension bracket 330.

[0039] The first bracket 310 is hinged to the first side 101 of the first plate body 100 along the length direction 001 through a first hinge shaft 110 extending along the width direction 002. The first bracket 310 can swing between a first folding position 111 close to the lower side of the first plate body 100 and a first extending position 112 away from the lower side of the first plate body 100. Obviously, the first bracket 310 being close to the plate body 100 means that the angle formed by the first bracket 310 and the plate body 100 becomes smaller, that is, the first bracket 310 being away from the plate body 100 means that the angle formed by the first bracket 310 and the plate body 100 becomes larger.

[0040] The second bracket 320 is hinged to the lower side of the second plate body 200 through a second hinge shaft 220 extending along the width direction 002. The second bracket 320 can swing between a second folding position 221 close to the lower side of the second plate body 200 and a second extending position 222 away from the lower side of the second plate body 200. Obviously, the second bracket 320 being close to the plate body 200 means that the angle formed by the second bracket 320 and the plate body 200 becomes smaller, that is, the second bracket 320 being away from the plate body 200 means that the angle formed by the second bracket 320 and the plate body 200 becomes larger.

[0041] The extension bracket 330 has one end hinged to the end of the second bracket 320 away from the second hinge shaft 220, and the other end can be hinged to the second side 102 of the first plate body 100 along the length direction 001.

[0042] One end of the first bracket 310 away from the first hinge shaft 110 is locked to the first side 201 of the second plate body 200 along the length direction 001 through a locking member 315. The first side 201 of the second plate body 200 along the length direction 001 is closer to the first hinge shaft 110 than its second side 202.

[0043] When the second bracket 320 is in the second extending position 222 and locked with the extension bracket 330 as a whole, the extension bracket 330 is hinged to the first plate body 100, the first bracket 310 is in the first extending position 102 and the locking member 315 is locked with the second plate body 200, the second plate body 200 is fixed above the first plate body 100. Preferably, the second plate body 200 is horizontally fixed above the first plate body 100.

[0044] When the locking member 315 is separated from the second plate body 200, the second bracket 320 is in the second folding position 221, and the extension bracket 330 is hinged to the first plate body 100, the second plate body 200 can be laid flat and linked with the first plate body 100.

[0045] Preferably, a set of brackets 300 are respectively provided on both sides of the heat preservation plate 1000 along the width direction 002. That is, a set of first brackets 310, second brackets 320 and extension brackets 330 are respectively provided on both sides of the heat preservation plate 1000 along the width direction 002.

[0046] Preferably, the locking member 315 is provided at one end of the first bracket 310 away from the first hinge shaft 110; the first end of the extension bracket 330 is hinged to the second bracket 320 through a third hinge shaft 230 extending along the width direction 002; the second end of the extension bracket 320 is hinged to the first plate body 100 through a fourth hinge shaft 140 extending along the width direction 002.

[0047] Preferably, the fourth hinge shaft 140 is installed on the first plate body 100. The second end of the extension bracket 330 is hook-shaped and detachably connected to the fourth hinge shaft 140.

[0048] Preferably, a first groove 103 for accommodating the first bracket 310 is provided on the lower side of the first plate body 100. When the first bracket 310 is in the first folding position 111, it is located in the first groove 103; a second groove 203 for accommodating the second bracket 320 is provided on the lower side of the second plate body 200. When the second bracket 320 is in the second folding position 221, it is located in the second groove 203.

[0049] Preferably, a support shaft 204 extending along the width direction 002 is provided on the second plate body 200; along the length direction 001, the support shaft 204 is farther from the first side 201 of the second plate body 200 along the length direction 001 than the second hinge shaft 220; when the second bracket 320 is in the second extended 222 position, it abuts against the support shaft 204.

[0050] Obviously, the support shaft 204 is not necessary, and the housing 205 can also replace the support shaft 204 as the support member of the second bracket 320.

[0051] Preferably, heat dissipation holes 010 are provided on both sides of the first plate body 100 along the length direction 001. The heat dissipation holes 010 are located on the lower side of the first plate body 100. LED lights 011 are provided inside the heat dissipation holes 010. The heat dissipation holes 010 have both heat dissipation and light transmission functions. As an optimization, the heat dissipation holes 010 are arrayed long strip-shaped through holes.

[0052] Preferably, as Figures 6 to 9As shown, one end of the first bracket 310 close to the first hinge shaft 110 is provided with a first chute 311 arranged along the width direction 002. A return spring 312 and a first positioning pin 313 with a spherical surface 314 are installed in the first chute 311 from the inside out along the width direction 002. A positioning hole 104 is provided on the first plate body 100, and the diameter of the positioning hole 104 is smaller than the diameter of the spherical surface 314. When the first bracket 310 is in the first extended position 112, the spherical surface 314 abuts against the positioning hole 104.

[0053] The first positioning pin 313 can also be replaced by a ball. The return spring 312 and the first positioning pin 313 with a spherical surface 314 can be replaced by an elastic body with a spherical surface formed on the first bracket 310.

[0054] The first chute 311, the return spring 312 and the first positioning pin 313 with a spherical surface 314 are not limited to being provided on the first bracket 310, and can also be provided on the first plate body 100. Correspondingly, the positioning hole 104 is provided on the first bracket 310.

[0055] Preferably, one end of the first bracket 310 away from the first hinge shaft 110 is provided with a slideway 318 extending along the width direction 002. The locking member 315 includes a rotation prevention pin 316 sliding along the slideway 318 and a first handle 317 fixed to the rotation prevention pin 316. The cross-sectional shape of the rotation prevention pin 316 corresponds to and cooperates with the cross-sectional shape of the slideway 318. A locking hole 206 corresponding to and cooperating with the cross-sectional shape of the rotation prevention pin 318 is provided on the second plate body 200.

[0056] Preferably, the rotation prevention pin 316 is a flat pin and the locking hole 206 is a flat hole. An avoidance groove 319 is provided on the lower side of the slideway 318, and the avoidance groove 319 accommodates the screw 3171 of the first handle 317 protruding from below the flat pin.

[0057] The rotation prevention pin 316 is not limited to a flat pin, and its cross-section can be in the shape of a cross, a triangle, a square, a star, etc.

[0058] Preferably, the second end of the extension bracket 330 is provided with a receiving portion 333 for rotatably cooperating with the fourth hinge shaft 140 and a notch 334 allowing the fourth hinge shaft 140 to enter the receiving portion 333 from the outside. The notch 334 is located on the first side 331 of the extension bracket 330 along its width direction 302. When the second plate body 200 is laid flat and linked with the first plate body 100, the notch 334 is as Figure 4 shown facing downward. When the second plate body 200 is laid flat and linked with the first plate body 100, only by lifting the second plate body 200 upward can the first plate body 100 be separated from the second plate body 200, and the operation is simple and fast. Since the notch 334 faces downward, the extension bracket 340 prevents the second plate body 200 from having a relative displacement with the first plate body 100 in the horizontal direction.

[0059] The notch 334 is not limited to being disposed on the first side 331 of the extension bracket 330 along the width direction 302 thereof, but may also be disposed at one end of the extension bracket 330 along the length direction 304 thereof.

[0060] Preferably, the end of the extended bracket 330 close to the third hinge shaft 230 is provided with a blocking portion 335; the end of the second bracket 320 away from the second hinge shaft 220 is provided with a second slide groove 328 extending along the length direction 301 of the second bracket 320; the second positioning pin 326 is in the locking position 321 (see Figure 5 ) and the unlocking position 322 can be slidably installed in the second sliding groove 328; when the second plate body 200 is fixed above the first plate body 100, the second side 332 of the extension bracket 330 along the width direction 302 thereof abuts against the first plate body 100, and the second positioning pin 326 abuts against the blocking portion 335 when sliding to the locking position 321, that is, the second bracket 320 is in the second extended position 222 and is locked as a whole with the extension bracket 330.

[0061] Obviously, the second bracket 320 and the extended bracket 330 are not limited to being locked as a whole by the second positioning pin 326 and the blocking portion 335. The second bracket 320 and the extended bracket 330 can also be locked as a whole by other means such as socket connection, threaded connection, bundling, etc.

[0062] Preferably, a second handle 327 is fixed on the second positioning pin 326 .

[0063] When the second positioning pin 326 slides to the unlocking position 322, the first handle 317 is toggled to make the anti-rotation pin 316 disengage from the locking hole 206, and the locking member 315 is in the unlocking state. The first bracket 310 is swung to the first folding position 111, and the second plate body 200 is rotated around the second hinge shaft 220 until the second bracket 320 is in the second folding position 221. The second plate body 200 rotates together with the second bracket 320 around the third hinge shaft 230 until the second plate body 200 is parallel to the first plate body 100, that is, Figure 10 The folded state is shown, which is convenient for storage.

[0064] Preferably, the first bracket 310 includes a tube body 3100 and connectors 3101 and 3102 located at both ends of the tube body 3100; the second bracket 320 includes a tube body 3200 and connectors 3201 and 3202 located at both ends of the tube body 3200. The locking member 315 is provided on the connector 3102, and the connector 3101 is hinged to the first plate body 100 through a first hinge shaft 110; the connector 3202 is hinged to the second plate body 200 through a second hinge shaft 220, and the connector 3201 is hinged to the extension bracket 330 through a third hinge shaft 230. A second chute 328 is provided on the connector 3201, and a second positioning pin 326 and a second handle 327 are installed on the connector 3201. This is beneficial to simplifying the manufacturing process and assembly process of the first bracket 310 and the second bracket 320.

[0065] Preferably, the connectors 3101, 3102, 3201, and 3202 are formed by injection molding, and the tube bodies 3100 and 3200 are metal tubes. This is beneficial to improving the structural strength of the first bracket 310 and the second bracket 320, reducing the processing difficulty, and reducing the cost.

[0066] The first plate body 100 and the second plate body 200 are connected by a link-type bracket 300. When the first plate body 100 is located above the second plate body 200 and is in the Figure 1 stacked state as shown, the second positioning pin 326 is in the locking position 321, that is, the second bracket 320 and the extension bracket 330 are integrated. As long as at least one of the first hinge shaft 110, the second hinge shaft 220, the fourth hinge shaft 140, and the locking member 315 can prevent relative rotation between the bracket and the plate body, the second plate body 200 can be fixed above the first plate body 100. For example, as long as the anti-rotation pin 316 of the locking member 315 is inserted into the locking hole 206 to prevent relative rotation between the first bracket 310 and the second plate body 200, the second plate body 200 can be fixed above the first plate body 100. Another example is that as long as the first positioning pin 313 cooperates with the positioning hole 104 to prevent relative rotation between the first bracket 310 and the first plate body 100, the second plate body 200 can be fixed above the first plate body 100. Another example is that as long as the second side 332 of the extension bracket 330 in its width direction 302 abuts against the first plate body 100, the second plate body 200 can be fixed above the first plate body 100. Another example is that as long as the support shaft 204 as a support member abuts against the second bracket 320, the second plate body 200 can be fixed above the first plate body 100. Therefore, when at least one of the first hinge shaft 110, the second hinge shaft 220, and the fourth hinge shaft 140 can prevent relative rotation between the bracket and the plate body, the anti-rotation pin 316 of the locking member 315 is not necessary and can be replaced by a round pin or other forms of pins.

[0067] Preferably, at least two of the first hinge shaft 110, the second hinge shaft 220, the fourth hinge shaft 140, and the locking member 315 can prevent relative rotation between the bracket and the plate body.

[0068] Preferably, at least three of the first hinge shaft 110 , the second hinge shaft 220 , the fourth hinge shaft 140 and the locking member 315 can prevent the bracket and the plate body from rotating relative to each other.

[0069] Preferably, the number of the anti-rotation pins 316 of the locking member 315 is not limited to one, but may be two or more.

[0070] Preferably, the locking between the first bracket 310 and the second plate 200 is not limited to the locking pin 316 and the locking hole 206, and can also be locked by other forms of locking members. Figure 7 The illustrated insulating board has a jack extending in the height direction 003, and the locking member is a plug at one end of the first bracket 310 away from the first hinge shaft 110, and the first bracket 310 and the second plate body 200 are locked together by the hole axis of the jack and the plug. For another example, the locking hole is a through hole of the ear provided on the second plate body 200, and the locking member is a hand screw provided at one end of the first bracket 310 away from the first hinge shaft 110, and the ear can be fixed to the first bracket 310 by the hand screw, so as to realize the locking connection between the first bracket 310 and the second plate body 200.

[0071] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. The heat preservation board comprises a first board body with a first heating element and a second board body with a second heating element, Characterized in that: The length direction of the heat preservation board is the length direction of the first board body and the second board body, and the width direction of the heat preservation board is the width direction of the first board body and the second board body; The bracket comprises a first bracket, a second bracket and an extension bracket; The first bracket is hinged to the first side of the first board body along the length direction through a first hinge shaft extending along the width direction, and the first bracket can swing between a first folding position close to the lower side of the first board body and a first extending position away from the lower side of the first board body; The second bracket is hinged to the lower side of the second board body through a second hinge shaft extending along the width direction, and the second bracket can swing between a second folding position close to the lower side of the second board body and a second extending position away from the lower side of the second board body; For the extension bracket, the first end is hinged to the end of the second bracket far from the second hinge shaft, and the second end can be hinged to the second side of the first board body along the length direction; One end of the first bracket far from the first hinge shaft is locked to the first side of the second board body along the length direction through a locking member, and the first side of the second board body along the length direction is closer to the first hinge shaft than its second side; When the second bracket is in the second extending position and locked with the extension bracket as a whole, the extension bracket is hinged to the first board body, the first bracket is in the first extending position and the locking member is locked with the second board body, the second board body is fixed above the first board body; When the locking member is separated from the second board body, the second bracket is in the second folding position, and the extension bracket is hinged to the first board body, the second board body can be laid flat and linked with the first board body; One end of the first bracket far from the first hinge shaft is provided with a slideway extending along the width direction; The locking member comprises a rotation prevention pin sliding along the slideway and a first handle fixed to the rotation prevention pin, and the cross-sectional shape of the rotation prevention pin corresponds to and cooperates with the cross-sectional shape of the slideway; The second board body is provided with a locking hole corresponding to and cooperating with the cross-sectional shape of the rotation prevention pin; The second end of the extension bracket is provided with a receiving portion for rotatably cooperating with a fourth hinge shaft and a notch allowing the fourth hinge shaft to enter the receiving portion from the outside, and the notch is located on the first side of the extension bracket along its width direction; When the second board body is laid flat and linked with the first board body, the notch faces downward.

2. The heat preservation board according to claim 1, Characterized in that: A set of the brackets are respectively arranged on both sides of the heat preservation board along the width direction.

3. The heat preservation board according to claim 2, Characterized in that: The locking member is arranged at one end of the first bracket far from the first hinge shaft; The first end of the extension bracket is hinged to the second bracket through a third hinge shaft extending along the width direction; The second end of the extension bracket is hinged to the first board body through a fourth hinge shaft extending along the width direction.

4. The heat preservation board according to claim 3, It is characterized in that: The fourth hinge shaft is installed on the first plate body; The second end of the extension bracket is hook-shaped and detachably connected to the fourth hinge shaft.

5. The heat preservation board according to claim 4, It is characterized in that: A first groove for accommodating the first bracket is provided on the lower side of the first plate body. When the first bracket is in the first folding position, it is located in the first groove; A second groove for accommodating the second bracket is provided on the lower side of the second plate body. When the second bracket is in the second folding position, it is located in the second groove.

6. The heat preservation board according to claim 5, It is characterized in that: A support shaft extending along the width direction is provided on the second plate body; The support shaft is farther from the first side of the second plate body along the length direction than the second hinge shaft; When the second bracket is in the second extended position, it abuts against the support shaft.

7. The heat preservation board according to claim 6, It is characterized in that: A first sliding groove arranged along the width direction is provided at one end of the first bracket close to the first hinge shaft. A return spring and a first positioning pin with a spherical surface are installed in the first sliding groove from the inside to the outside along the width direction; A positioning hole is provided on the first plate body, and the diameter of the positioning hole is smaller than the diameter of the spherical surface; When the first bracket is in the first extended position, the spherical surface abuts against the positioning hole.

8. The heat preservation board according to claim 6, It is characterized in that: A blocking portion is provided at one end of the extension bracket close to the third hinge shaft; A second sliding groove extending along the length direction of the second bracket is provided at one end of the second bracket away from the second hinge shaft; A second positioning pin is slidably installed in the second sliding groove between a locking position and an unlocking position; When the second plate body is fixed above the first plate body, the second side of the extension bracket along its width direction abuts against the first plate body, and when the second positioning pin slides to the locking position, it abuts against the blocking portion.

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