Umbrella-shaped gas heater and component arrangement structure thereof

Abstract

The invention is suitable for the technical field of gas heaters, and provides an umbrella-shaped gas heater and a component arrangement structure thereof, the umbrella-shaped gas heater comprises a gas chamber, a supporting part and a combustion device, the gas chamber comprises a barrel cover, a barrel cover fixing frame, a barrel supporting plate, a door plate and a base, and the barrel cover and the base are vertically arranged in the vertical direction of the umbrella-shaped gas heater; the barrel supporting plate is of an arc-shaped structure and is a metal plate with ductility, the lower end of the barrel supporting plate is connected with the upper end edge of the base in an abutting mode, the barrel cover fixing frame is provided with an outer ring body, the upper end of the barrel supporting plate is connected with the outer wall of the outer ring body in an abutting mode, and the door plate is of an arc-shaped structure and is a metal plate with ductility. One side edge of the door plate is connected with one side edge of the barrel supporting plate through an inserting mechanism, the diameter of the inner wall of the barrel cover is larger than that of the outer wall of the barrel cover fixing frame, and the barrel cover is arranged above the barrel cover fixing frame. According to the device, the stability problem of the umbrella-shaped gas heater is solved, and the effects that a user can conveniently install and use the umbrella-shaped gas heater, and the packaging efficiency is improved are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of heaters, and more specifically, it relates to an umbrella-shaped gas heater and its component arrangement structure. Background Art

[0002] The umbrella-shaped gas heater is a type of gas heater. It is relatively slender as a whole and occupies less space when in use. However, the overall stability of this umbrella-shaped gas heater is not high.

[0003] Currently, for umbrella-shaped gas heaters on the market, a special foot tube design is mainly adopted. Although this foot tube can play a certain supporting role and improve the stability of the heater, its structural design has certain limitations. First, the installation of the foot tube requires accurately determining the height of the gas chamber of the heater to ensure the balance of the overall structure. Second, the foot tube usually needs to be fixed to the base by welding, which not only increases the complexity of the production process but also may make the welding point a potential weak link, affecting the durability of the product. In addition, this foot tube design occupies a large amount of space, not only increasing the volume of the product but also making packaging and transportation more difficult, which is not conducive to subsequent packaging, shipping, and warehousing management. Therefore, although the foot tube design has certain advantages in improving stability, its deficiencies in space utilization and production efficiency are still key points that need to be further optimized and improved.

[0004] Therefore, an umbrella-shaped gas heater and its component arrangement structure are proposed to solve the above problems. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an umbrella-shaped gas heater and its component arrangement structure with high stability, more space-saving packaging, convenient installation, and higher safety.

[0006] To achieve the above object, the present invention provides the following technical solutions: An umbrella-shaped gas heater, comprising a gas chamber, a support portion, and a combustion device. The gas chamber includes a barrel cover, a barrel cover fixing frame, a barrel support plate, a door panel, and a base. The barrel cover and the base are arranged up and down along the vertical direction of the umbrella-shaped gas heater. The barrel support plate is an arc-shaped structure and is made of a malleable metal sheet. The lower end of the barrel support plate abuts against the upper edge of the base. The barrel cover fixing frame has an outer ring body, and the upper end of the barrel support plate abuts against the outer wall of the outer ring body. The door panel is an arc-shaped structure and is made of a malleable metal sheet. One side edge of the door panel is connected to one side edge of the barrel support plate through a plugging mechanism. The inner wall diameter of the barrel cover is larger than the outer wall diameter of the barrel cover fixing frame. The barrel cover is arranged above the barrel cover fixing frame, and the barrel cover covers the outer ring body and the upper end of the barrel support plate. The support portion includes a lower support pipe and an upper support pipe. The lower end of the lower support pipe is connected to the barrel cover and the barrel cover fixing frame, and the upper end of the lower support pipe is inserted into and bolted to the lower end of the upper support pipe. The combustion device is inserted into and bolted to the upper end of the upper support pipe.

[0007] By adopting the above technical solutions, the barrel cover fixing frame is connected to the barrel cover, the barrel support plate, and the lower support pipe, improving the overall stability.

[0008] The present invention is further configured as: The barrel cover fixing frame further has a door panel baffle. The door panel baffle is connected to the lower side of the outer ring body, and the upper end of the door panel abuts against the outer wall of the door panel baffle. And the plugging mechanism includes multiple groups of door pin seats and door pins, and the door pins are inserted into the door pin seats.

[0009] The present invention is further configured as: Each of the two side edges of the barrel support plate has a group of support pieces. The support pieces protrude towards the inside of the gas chamber. The top of the support piece abuts against the bottom of the outer ring body, and the bottom of the support piece abuts against the top of the base.

[0010] The present invention is further configured as: The door panel baffle is respectively abutted against the two support pieces near the two ends of the barrel support plate.

[0011] The present invention is further configured as: The umbrella-shaped gas heater further includes a heat-conducting top. The heat-conducting top is arranged above the combustion device. The heat-conducting top includes a center piece and multiple groups of combined pieces. The center piece is bolted to the combustion device, and the multiple groups of combined pieces are bolted to the center piece.

[0012] The present invention is further configured as: The barrel cover fixing frame further has a barrel cover inner pipe and multiple groups of connecting columns. The outer ring body is connected to the barrel cover inner pipe through the multiple groups of connecting columns, and the lower end of the lower support pipe, the barrel cover, and the barrel cover fixing frame are bolted together.

[0013] The present invention is further configured as: The gas chamber further includes a cover plate. The cover plate is arranged above the barrel cover, and the cover plate covers the lower end of the lower support pipe.

[0014] By adopting the above technical solution, the cover plate covers the lower end of the lower support pipe with bolts, which can prevent items with silk threads from being hooked by the bolts and damaged, and at the same time prevent users from cutting their fingers when using, improving the safety of the product. The bucket cover provides a space for placing items.

[0015] A component arrangement structure of an umbrella-shaped gas heater is used to disassemble the umbrella-shaped gas heater and store it in a box. The box has a bottom plate, two long side plates opposite to each other, and two short side plates opposite to each other. The two long side plates and the two short side plates are connected around the bottom plate. The bucket support plate is placed on the bottom plate. The door plate is placed inside the area surrounded by the bucket support plate and fits against the inner wall of the bucket support plate. The outer wall diameter of the door plate is less than or equal to the inner wall diameter of the bucket support plate. Among them, before the umbrella-shaped gas heater is disassembled, the outer wall diameter of the door plate is greater than the inner wall diameter of the bucket support plate; the combustion device is placed inside the area surrounded by the bucket support plate and on the inner wall of the door plate; and the lower support pipe and the upper support pipe are respectively placed between the connection of each of the two long side plates and the bottom plate and the bucket support plate.

[0016] The present invention is further arranged as follows: There is a notch between the two side edges of the bucket support plate. The base straddles the notch and abuts against the two side edges of the bucket support plate. The bucket cover covers the bucket cover fixing frame, and both the bucket cover and the bucket cover fixing frame are placed between the base and the combustion device.

[0017] The present invention is further arranged as follows: The central plate and multiple groups of combined plates of the heat-conducting top are stacked on each other and placed on the base. Both the bucket cover and the bucket cover fixing frame are located inside the base, and the bucket cover fixing frame abuts against the two side edges of the bucket support plate.

[0018] By adopting the above technical solution, all components of the umbrella-shaped gas heater can be placed in the box in the most efficient space utilization manner, effectively reducing the volume of the box, facilitating the user's storage, and during transportation, more boxes can be placed in a container, reducing the transportation cost and improving the production and transportation efficiency.

[0019] In summary, the present application includes at least one of the following beneficial technical effects: 1. By connecting the bucket cover fixing frame with the bucket cover, the bucket support plate, and the lower support pipe, the overall stability is improved.

[0020] 2. By covering the connecting piece with bolts with a cover plate, it can prevent items with silk threads from being hooked by the bolts and damaged, and prevent users from cutting their fingers when using, etc., improving the safety of the product. The bucket cover provides a space for placing items.

[0021] 3. It can effectively reduce the volume of the box, facilitate the user's storage, and during transportation, more boxes can be placed in a container, reducing the transportation cost and improving the production and transportation efficiency. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the umbrella-shaped gas heater of the present invention; Figure 2 It is an exploded view of the umbrella-shaped gas heater of the present invention; Figure 3 It is an exploded view of the barrel cover and the barrel cover fixing frame in the present invention; Figure 4 It is an exploded view of the heat-conducting top in the present invention; Figure 5 It is an exploded view of the lower half of the umbrella-shaped gas heater of the present invention; Figure 6 It is a schematic layout diagram of the present invention; Figure 7 It is an installation schematic diagram of the base, the moving wheels and the barrel support plate in the present invention; Figure 8 It is an installation schematic diagram of the barrel cover, the barrel cover fixing frame, the lower support pipe, the cover plate and the Figure 7 components in the present invention; Figure 9 It is an installation schematic diagram of the door panel and the Figure 8 components in the present invention; Figure 10 It is an installation schematic diagram of the heat-conducting top in the present invention; Figure 11 It is an installation schematic diagram of the combustion device, the double-headed bolt and the upper support pipe in the present invention; Figure 12 It is in the present invention Figure 11 components and Figure 13 components installation schematic diagram in the present invention; Figure 13 It is in the present invention Figure 9 components and Figure 12 components installation schematic diagram in the present invention.

[0023] Explanation of reference numerals: 1. Gas chamber; 11. Barrel cover; 12. Barrel cover fixing frame; 121. Outer ring body; 122. Inner barrel pipe of the barrel cover; 123. Connecting column; 124. Door panel baffle; 13. Barrel support plate; 131. Door pin seat; 132. Support piece; 14. Door panel; 141. Door pin; 15. Base; 16. Cover plate; 17. Moving wheel; 2. Support part; 21. Lower support pipe; 22. Upper support pipe; 3. Combustion device; 4. Heat-conducting top; 41. Central piece; 42. Composite piece. Detailed implementation manners

[0024] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0026] Please refer to Figures 1-13 , the present invention provides the following technical solutions: Embodiment 1, refer to Figures 1-4 , an umbrella-shaped gas heater, comprising a gas chamber 1, a support part 2, a combustion device 3 and a heat-conducting top 4. Among them, the gas chamber 1 is used to place and connect a gas cylinder to provide fuel through the gas cylinder. The support part 2 is used to support the combustion device 3 and the heat-conducting top 4 at the top. The combustion device 3 is used to receive the fuel provided by the gas cylinder in the gas chamber 1 and burn it. The heat-conducting top 4 is used to guide the heat energy generated by the combustion of the combustion device 3 downward.

[0027] The gas chamber 1 includes a barrel cover 11, a barrel cover fixing frame 12, a barrel support plate 13, a door panel 14, a base 15 and moving wheels 17. The barrel cover 11 and the base 15 are arranged up and down along the vertical direction of the umbrella-shaped gas heater. The base 15 is provided with moving wheels 17 on one side of the barrel support plate 13. The moving wheels 17 are used to assist the user in moving the umbrella-shaped gas heater. The barrel support plate 13 is an arc-shaped structure. The barrel support plate 13 is a metal plate with ductility. The lower end of the barrel support plate 13 abuts against the upper edge of the base 15. The barrel cover fixing frame 12 has an outer ring body 121. The upper end of the barrel support plate 13 abuts against the outer wall of the outer ring body 121. The door panel 14 is an arc-shaped structure. The door panel 14 is a metal plate with ductility. One side edge of the door panel 14 is connected to one side edge of the barrel support plate 13 through a plugging mechanism. The inner wall diameter of the barrel cover 11 is larger than the outer wall diameter of the barrel cover fixing frame 12. The barrel cover 11 is arranged above the barrel cover fixing frame 12, and the barrel cover 11 covers the outer ring body 121 and the upper end of the barrel support plate 13. The support part 2 includes a lower support pipe 21 and an upper support pipe 22. The lower end of the lower support pipe 21 is connected to the barrel cover 11 and the barrel cover fixing frame 12. The upper end of the lower support pipe 21 is inserted into and bolted to the lower end of the upper support pipe 22. The combustion device 3 is inserted into and bolted to the upper end of the upper support pipe 22. The barrel cover fixing frame 12 also has a door panel baffle 124. The door panel baffle 124 is connected to the lower side of the outer ring body 121. The upper end of the door panel 14 abuts against the outer wall of the door panel baffle 124. And the plugging mechanism includes multiple groups of door pin seats 131 and door pins 141. The door pins 141 are inserted into the door pin seats 131; The umbrella-shaped gas heater further includes a heat-conducting top 4, which is arranged on the upper side of the combustion device 3. The heat-conducting top 4 includes a central plate 41 and multiple groups of combined plates 42. The central plate 41 is connected to the combustion device 3 by bolts, and the multiple groups of combined plates 42 are connected to the central plate 41 by bolts. The barrel cover fixing frame 12 also has a barrel cover inner tube 122 and multiple groups of connecting columns 123. The outer ring body 121 is connected to the barrel cover inner tube 122 by the multiple groups of connecting columns 123. The lower end of the lower support tube 21, the barrel cover 11 and the barrel cover fixing frame 12 are connected by bolts.

[0028] By connecting the barrel cover fixing frame 12 with the barrel cover 11, the barrel support plate 13 and the lower support tube 21, the overall stability is improved. At the same time, compared with the foot tube design, the internal space occupation is avoided, and the space for subsequent packaging and transportation is also reduced.

[0029] Embodiment 2, refer to Figure 2 , the gas chamber 1 further includes a cover plate 16, which is arranged above the barrel cover 11, and the cover plate 16 covers the lower end of the lower support tube 21.

[0030] During use, items can be placed on the surface of the barrel cover 11. By covering the lower end of the lower support tube 21 fixed by bolts with the cover plate 16, it can prevent items with filaments from being hooked and damaged by the bolts, and prevent users from cutting their fingers when using, etc., improving the safety of the product and providing an item placement space.

[0031] Embodiment 3, refer to Figure 5 , each of the two side edges of the barrel support plate 13 has a group of support pieces 132, the support pieces 132 protrude towards the inside of the gas chamber 1, the top end of the support pieces 132 abuts against the bottom end of the outer ring body 121, and the bottom end of the support pieces 132 abuts against the top end of the base 15. The door panel stoppers 124 are respectively abutted against the two support pieces 132 near the two ends of the barrel support plate 13.

[0032] By the two groups of support pieces 132 abutting against the top end of the base 15, the bottom end of the outer ring body 121 and the door panel stoppers 124, the lower half of the umbrella-shaped gas heater is not likely to shake, and the overall structure is more stable.

[0033] Embodiment 4, refer to Figure 6, the umbrella-shaped gas heater is disassembled and stored in the box. The box has a bottom plate, two long side plates opposite to each other, and two short side plates opposite to each other. The two long side plates and the two short side plates are connected around the bottom plate. The barrel support plate 13 is placed on the bottom plate. The door plate 14 is placed inside the enclosure formed by the barrel support plate 13 and fits against the inner wall of the barrel support plate 13. The outer wall diameter of the door plate 14 is less than or equal to the inner wall diameter of the barrel support plate 13. Among them, before the umbrella-shaped gas heater is disassembled, the outer wall diameter of the door plate 14 is greater than the inner wall diameter of the barrel support plate 13; the combustion device 3 is placed inside the enclosure formed by the barrel support plate 13 and on the inner wall of the door plate 14; and the lower support pipe 21 and the upper support pipe 22 are respectively placed between the connection of each of the two long side plates and the bottom plate and the barrel support plate 13. There is a notch between the two side edges of the barrel support plate 13. The base 15 straddles the notch and abuts against the two side edges of the barrel support plate 13. The barrel cover 11 covers the barrel cover fixing frame 12, and both the barrel cover 11 and the barrel cover fixing frame 12 are placed between the base 15 and the combustion device 3. The central plate 41 and multiple groups of combined plates 42 of the heat conduction top 4 are stacked on each other and placed on the base 15. Both the barrel cover 11 and the barrel cover fixing frame 12 are located inside the base 15, and the barrel cover fixing frame 12 abuts against the two side edges of the barrel support plate 13; among them, the barrel support plate 13 with the enlarged diameter does not affect the subsequent use. Refer to Figures 8-9 , during installation, the barrel cover fixing frame 12, the barrel support plate 13, and the base 15 are fixed from the side by bolts, so that the diameter of the barrel support plate 13 is fixed by bolts to the diameters of the barrel cover fixing frame 12 and the base 15.

[0034] Through the above component arrangement structure of the umbrella-shaped gas heater, all components of the umbrella-shaped gas heater can be placed in the box in the most efficient space utilization manner, effectively reducing the volume of the box, facilitating the user's storage, and during transportation, more boxes can be placed in a container, reducing transportation costs and improving production and transportation efficiency.

[0035] Embodiment Five. Refer to Figures 7-13 , the installation steps of the umbrella-shaped gas heater are as follows: First, install the lower half of the umbrella-shaped gas heater. First, pass the bolt through the outer side of the moving wheel 17, the base 15 and tighten the nut on the inner wall of the base 15; then align the threaded holes at the lower end of the barrel support plate 13 with the threaded holes of the base 15 and tighten them from the side with bolts. At this time, the inner wall diameter of the lower end of the barrel support plate 13 is the same as the upper end face diameter of the base 15; then tighten the barrel cover fixing frame 12 and the barrel support plate 13 from the inside to the outside of the barrel support plate 13 with bolts. Then, tighten the lower support pipe 21, the barrel cover 11 and the barrel cover fixing frame 12 with bolts and nuts, and put the cover plate 16 on the lower support pipe 21 to cover the lower end of the lower support pipe 21; finally, insert the door plate 14 into the door pin seat 131 of the barrel support plate 13 through the door pin 141. Then, install the upper part of the umbrella-shaped gas heater. Surround the central piece 41 with multiple groups of combined pieces 42 and tighten them with bolts. Secondly, align the threaded holes of the upper support pipe 22 with the threaded holes of the combustion device 3 and tighten them with bolts. Finally, fix and connect the combustion device 3 and the central piece 41 with a double-headed bolt. Remove the intake valve of the combustion device 3, pass the gas hose through the lower support pipe 21 and into the interior of the gas chamber 1, then connect the intake valve and the gas hose. Then, fix and connect the upper support pipe 22 and the lower support pipe 21 with bolts to complete the installation of the umbrella-shaped gas heater.

[0036] Among them, the bucket lid 11 and the bucket lid fixing bracket 12 can be in a fixed connection state or a separated state when leaving the factory. When the bucket lid 11 and the bucket lid fixing bracket 12 are fixedly connected, the user can reduce the step of aligning the screw holes on the bucket lid 11 and the bucket lid fixing bracket 12 during installation. When the bucket lid 11 and the bucket lid fixing bracket 12 are separated, the production process during factory production can be reduced, and the production efficiency can be improved.

[0037] All the above steps use bolts for fixation, which is convenient for users to install or disassemble. There are no bolts exposed on the outer wall from the lower end of the lower support pipe 21 of the umbrella-shaped gas heater to the base 15, which can avoid the problem of users' fingers being scratched by bolts, improve the safety of the product, and can also avoid the problem of clothes being hooked by bolts and damaged, thereby avoiding economic losses to users.

[0038] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present invention.

Claims

1. An umbrella-shaped gas heater, characterized in that: Comprising: A gas chamber (1), the gas chamber (1) including a barrel cover (11), a barrel cover fixing frame (12), a barrel support plate (13), a door panel (14) and a base (15). The barrel cover (11) and the base (15) are arranged up and down along the vertical direction of the umbrella-shaped gas heater. The barrel support plate (13) is an arc-shaped structure and is made of a malleable metal sheet. The lower end of the barrel support plate (13) abuts against the upper edge of the base (15). The barrel cover fixing frame (12) has an outer ring body (121), and the upper end of the barrel support plate (13) abuts against the outer wall of the outer ring body (121). The door panel (14) is an arc-shaped structure and is made of a malleable metal sheet. One side edge of the door panel (14) is connected to one side edge of the barrel support plate (13) through a plugging mechanism. The inner wall diameter of the barrel cover (11) is larger than the outer wall diameter of the barrel cover fixing frame (12). The barrel cover (11) is arranged above the barrel cover fixing frame (12), and the barrel cover (11) covers the outer ring body (121) and the upper end of the barrel support plate (13). A support part (2), the support part (2) including a lower support pipe (21) and an upper support pipe (22). The lower end of the lower support pipe (21) is connected to the barrel cover (11) and the barrel cover fixing frame (12), and the upper end of the lower support pipe (21) is inserted into and bolted to the lower end of the upper support pipe (22); and A combustion device (3), the combustion device (3) being inserted into and bolted to the upper end of the upper support pipe (22).

2. The umbrella-shaped gas heater according to claim 1, characterized in that: The barrel cover fixing frame (12) further has a door panel baffle (124), the door panel baffle (124) being connected to the lower side of the outer ring body (121), and the upper end of the door panel (14) abuts against the outer wall of the door panel baffle (124); and the plugging mechanism includes multiple groups of door pin seats (131) and door pins (141), and the door pins (141) are inserted into the door pin seats (131).

3. The umbrella-shaped gas heater according to claim 2, characterized in that: Each of the two side edges of the barrel support plate (13) has a set of support pieces (132), the support pieces (132) protruding towards the inside of the gas chamber (1), the top of the support pieces (132) abutting against the bottom end of the outer ring body (121), and the bottom end of the support pieces (132) abutting against the top end of the base (15).

4. The umbrella-shaped gas heater according to claim 3, characterized in that: The two ends of the door panel baffle (124) close to the barrel support plate (13) respectively abut against the two support pieces (132).

5. The umbrella-shaped gas heater according to claim 2, wherein: The umbrella-shaped gas heater further includes a heat-conducting top (4), the heat-conducting top (4) being arranged above the combustion device (3). The heat-conducting top (4) includes a central piece (41) and multiple groups of combined pieces (42). The central piece (41) is bolted to the combustion device (3), and the multiple groups of combined pieces (42) are bolted to the central piece (41).

6. The umbrella-shaped gas heater according to claim 1, characterized in that: The barrel cover fixing frame (12) further has a barrel cover inner tube (122) and multiple groups of connecting columns (123). The outer ring body (121) is connected to the barrel cover inner tube (122) through the multiple groups of connecting columns (123). The lower end portion of the lower support tube (21), the barrel cover (11), and the barrel cover fixing frame (12) are connected by bolts.

7. The umbrella-shaped gas heater according to claim 6, characterized in that: The gas chamber (1) further includes a cover plate (16). The cover plate (16) is disposed above the barrel cover (11), and the cover plate (16) covers the lower end portion of the lower support tube (21).

8. A component arrangement structure of an umbrella-shaped gas heater, used to disassemble and store the umbrella-shaped gas heater according to any one of claims 1 to 7 into a box body. The box body has a bottom plate, two opposite long side side plates, and two opposite short side side plates. The two long side side plates and the two short side side plates are connected around the bottom plate. It is characterized in that: The barrel support plate (13) is placed on the bottom plate. The door plate (14) is placed inside the area surrounded by the barrel support plate (13) and fits against the inner wall of the barrel support plate (13). The outer wall diameter of the door plate (14) is less than or equal to the inner wall diameter of the barrel support plate (13). Among them, before the umbrella-shaped gas heater is disassembled, the outer wall diameter of the door plate (14) is greater than the inner wall diameter of the barrel support plate (13); The combustion device (3) is placed inside the area surrounded by the barrel support plate (13) and on the inner wall of the door plate (14); and The lower support tube (21) and the upper support tube (22) are respectively placed between the connection of each of the two long side side plates and the bottom plate and the barrel support plate (13).

9. The component layout structure of the umbrella-shaped gas heater according to claim 8, characterized in that: There is a notch between the two side edges of the barrel support plate (13). The base (15) straddles the notch and abuts against the two side edges of the barrel support plate (13). The barrel cover (11) covers the barrel cover fixing frame (12), and both the barrel cover (11) and the barrel cover fixing frame (12) are placed between the base (15) and the combustion device (3).

10. The component arrangement structure of the umbrella-shaped gas heater according to claim 9, characterized in that: The central piece (41) and the multiple groups of combined pieces (42) of the heat-conducting top (4) are stacked on each other and placed on the base (15). Both the barrel cover (11) and the barrel cover fixing frame (12) are located inside the base (15), and the barrel cover fixing frame (12) abuts against the two side edges of the barrel support plate (13).

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