Frying and baking device capable of being folded and stored

Abstract

The invention discloses a frying and baking device capable of being folded and stored, relates to the technical field of frying and baking devices, and aims to solve the problems that the stability of the frying and baking device is low, the toppling risk exists, and two shells are inconvenient to be mutually folded and stored due to the fact that two surfaces of the existing frying and baking device cannot touch the ground at the same time when the frying and baking device is unfolded. Comprising a left outer shell and a right outer shell, and a supporting seat is mounted below the outer shells; the fixing frames are arranged on the two sides of the supporting base, supporting pieces are arranged on the inner walls of the fixing frames, a left channel and a right channel are formed in the outer walls of the supporting pieces, the lower portions of the channels are narrow, the upper portions of the channels are wide, rotating shafts are arranged between the channels and the outer shell, and a handle is arranged at one end of the outer shell. A plurality of supporting feet are arranged at the upper end of the outer wall of the outer shell, bottom feet are arranged on the two sides of the lower surface of the fixing frame, a winding frame is installed on the outer wall of one side of the fixing frame, and an oil box is detachably installed on the lower surface of the supporting seat.

Description

Technical Field

[0001] The present invention relates to the technical field of grills, specifically a foldable and collapsible grill. Background Art

[0002] A grill is a tool for cooking food. It heats the food in the middle by heating one side or both sides simultaneously at high temperature to achieve the purpose of cooking food. With the rapid development of China's national economy and the substantial improvement of people's living standards, more and more such products have entered people's daily lives. An electric grill uses electricity as an energy source and converts electrical energy into heat energy to grill food. Using electricity as an energy source to grill food has the characteristics of being clean, safe, convenient, and fast.

[0003] For example, the public notice document: CN209499519U, named "A New Type of Grill", includes an upper grilling unit, a lower grilling unit, and an oil box. The upper grilling unit and the lower grilling unit are hinged. The upper grilling unit includes an upper griddle and a lifting rod arranged around the upper griddle. The lower grilling unit includes a lower griddle and a base. The lower griddle is fixed on the base. Oil baffles are provided at the edges of the grilling surfaces of the upper griddle and the lower griddle. Oil guiding openings are opened on the oil baffles. The two oil guiding openings are respectively located on two opposite side edges of the upper griddle and the lower griddle. The oil box is arranged on the base through a detachable mechanism, and the outer end of the oil box extends out. The advantages of the new type of grill disclosed in this invention are that the product structure is simple, and the eccentric oil box arranged on the base can well collect the waste oil generated on the upper and lower grilling surfaces and can realize the positioning and clamping of the oil box.

[0004] The above-mentioned existing grills cannot touch the ground with both sides simultaneously in the unfolded state, resulting in low stability of the grill, a risk of tipping over, and inconvenience in folding and storing the two shells with each other. Therefore, it does not meet the existing requirements, and for this reason, we propose a foldable and collapsible grill. Summary of the Invention

[0005] The purpose of the present invention is to provide a foldable and collapsible grill to solve the problems in the above-mentioned background art that the existing grills cannot touch the ground with both sides simultaneously in the unfolded state, resulting in low stability of the grill, a risk of tipping over, and inconvenience in folding and storing the two shells with each other.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A foldable and collapsible grill, including: an outer shell, and there are two outer shells on the left and right. A support seat is installed below the outer shell.

[0007] It further includes:

[0008] The fixing brackets are arranged on both sides of the support base. Support pieces are arranged on the inner walls of the fixing brackets. There are two left and right channels arranged on the outer walls of the support pieces, and the channels are narrower at the bottom and wider at the top. A rotating shaft is arranged between the channels and the outer casing. A handle is arranged at one end of the outer casing. Multiple support feet are arranged at the upper end of the outer wall of the outer casing.

[0009] Preferably, feet are arranged on both sides of the lower surface of the fixing brackets, and a wire winding rack is installed on the outer wall of one side of the fixing brackets.

[0010] Preferably, an oil box is detachably installed on the lower surface of the support base, and a griddle is arranged above the interior of the outer casing.

[0011] Preferably, a junction box is detachably installed on the outer wall of the outer casing through screws, and a knob is arranged on one side of the junction box.

[0012] Preferably, a threaded groove is arranged inside the support feet, an assembly column is installed inside the threaded groove, threaded sections and insertion sections are respectively arranged at both ends of the assembly column, and one end of the assembly column is assembled with the threaded groove through the threaded section.

[0013] Preferably, a bottom block is arranged at the lower end of the insertion section, an insertion groove is arranged on the outer wall of the upper surface of the bottom block, and the assembly column is combined with the insertion groove through the insertion section. A rubber cushion block is bonded to the outer wall of the lower surface of the bottom block.

[0014] Preferably, docking grooves and docking blocks are respectively arranged on the outer walls of the docking ends of the two handles, and the two handles are assembled and installed through the docking grooves and the docking blocks.

[0015] Preferably, an inner installation layer is arranged inside the outer casing, an electric heater is arranged inside the inner installation layer, a bracket is arranged below the griddle, a support rod is installed below the bracket, and the lower end of the support rod is assembled with the bottom of the inner installation layer through screws.

[0016] Preferably, combination grooves are arranged at the four corners of the outer wall of the bracket. First card slots are arranged at the bottoms of the combination grooves. Second card slots are arranged on the inner walls of the combination grooves. Foot columns are arranged at the four corners of the outer wall of the lower surface of the griddle. First card blocks are arranged at the lower ends of the foot columns, and the first card blocks are engaged with the first card slots. Second card blocks are arranged on the outer walls of the foot columns, and the second card blocks are engaged with the second card slots.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By providing a housing, a fixing frame, a support base, a channel, a rotating shaft, a handle, and support feet, the present invention enables the griddle to have a folding and storage function, facilitating the user to unfold it during use and fold and place it during storage; in the unfolded state, both sides of the housing can effectively touch the ground, enhancing stability.

[0019] In the folded and stored state, it is convenient for the user to carry and move; specifically, during folding and storage, the user grasps the handle and rotates it by 90°, and the rotating shaft at the housing slides into the bottom of the channel and gets stuck, causing the two sides of the housing to rotate and close together to form a box-like structure; then, the handle allows the user to easily grasp and carry the entire griddle.

[0020] When it needs to be unfolded, the user gently lifts the housing upwards to move the rotating shaft of the housing to the upper part of the channel for positioning, and then rotates it by 90° to unfold the two sides of the housing; in the unfolded state, the support feet of the housing touch the ground or the tabletop for two-sided support and fixation, enhancing stability.

[0021] It solves the problems that when the griddle is in the unfolded state, both sides cannot touch the ground simultaneously, resulting in low stability of the griddle, a risk of tipping over, and inconvenience in folding and storing the two shells.

[0022] 2. By providing a threaded groove, an assembly post, a threaded section, an insertion section, a bottom block, an insertion groove, and a rubber cushion block, the griddle can be further adjusted at the support feet when it is unfolded and placed, enabling the griddle to adjust the extension length of the support feet according to the height difference, making the griddle more stable and firm when placed, and the adjustment process does not require external tools, facilitating user use.

[0023] Specifically, after the griddle is horizontally rotated and unfolded, the user grasps and rotates the bottom block to rotate the threaded section of the assembly post outwards of the insertion groove, and by rotation, the extended part of the assembly post increases. According to different height differences, the extended part lengths of different support feet are also adaptively adjusted, finally enabling the support feet of the griddle to be stably placed on the tabletop or the ground. At the same time, the rubber cushion block touches the tabletop or the ground, increasing the friction and improving the anti-slip property, further enhancing the stability of the griddle.

[0024] In the stored state, reverse the bottom block and screw the threaded section of the assembly post into the threaded groove to make the bottom block close to the bottom of the support foot, reducing the protruding extended space at this support foot and facilitating the carrying and storage operation.

[0025] 3. By providing a bracket, a combined groove, a first card slot, a second card slot, a foot post, a first card block, and a second card block, the griddle pan can be more firmly placed or stored, preventing the griddle pan from falling, and this structure also facilitates the user to quickly take out and remove the griddle pan. The overall structure is simple and convenient for the user to operate.

[0026] Specifically, in the placed state, align the foot columns of the griddle pan with the combination slots, and press down the griddle pan so that the foot columns are inserted into the combination slots. After the foot columns are inserted into the combination slots, the first clamping block will be embedded and engaged in the first clamping slot. At the same time, the second clamping block is engaged with the second clamping slot, so that the griddle pan is firmly placed on the bracket and will not fall off in the folded and stored state.

[0027] When disassembling and replacing the griddle pan, after the griddle pan cools down, pull up the griddle pan so that the first clamping block and the second clamping block are respectively disengaged and separated from the first clamping slot and the second clamping slot, so that the foot columns can be disengaged from the combination slots, which is convenient for users to use. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the folding and storing state of the grilling device of the present invention;

[0029] Figure 2 is a schematic structural diagram of the unfolded state of the grilling device of the present invention;

[0030] Figure 3 is a schematic structural diagram of the support base of the present invention;

[0031] Figure 4 is a schematic structural diagram of the lower surface of the grilling device of the present invention in the unfolded state;

[0032] Figure 5 is a schematic structural diagram of the support feet of the present invention;

[0033] Figure 6 is a schematic structural diagram of the inner installation layer of the present invention;

[0034] Figure 7 is a schematic structural diagram of the bracket of the present invention;

[0035] Figure 8 is a schematic structural diagram of the assembly structure of the bracket and the griddle pan of the present invention;

[0036] In the figure: 1. Outer housing; 2. Handle; 3. Griddle pan; 4. Fixed frame; 5. Support base; 6. Support plate; 7. Channel; 8. Wire winding frame; 9. Rotating shaft; 10. Oil box; 11. Junction box; 12. Knob; 13. Support feet; 14. Bottom feet; 15. Threaded groove; 16. Assembly column; 17. Threaded section; 18. Insertion section; 19. Bottom block; 20. Insertion groove; 21. Rubber cushion block; 22. Docking groove; 23. Docking block; 24. Inner installation layer; 25. Electric heater; 26. Bracket; 27. Support rod; 28. Combination slot; 29. First clamping slot; 30. Second clamping slot; 31. Foot column; 32. First clamping block; 33. Second clamping block. Detailed Embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0038] Please refer to Figure 1-8 , an embodiment provided by the present invention: a foldable and collapsible griddle, including: an outer casing 1, and there are two left and right outer casings 1, and a support base 5 is installed below the outer casing 1;

[0039] It further includes:

[0040] A fixing frame 4, which is arranged on both sides of the support base 5, a support piece 6 is arranged on the inner wall of the fixing frame 4, two left and right channels 7 are arranged on the outer wall of the support piece 6, and the channels 7 are narrower at the bottom and wider at the top. A rotating shaft 9 is arranged between the channel 7 and the outer casing 1. One end of the outer casing 1 is provided with a handle 2, and a plurality of support feet 13 are arranged at the upper end of the outer wall of the outer casing 1;

[0041] Through the settings of the outer casing 1, the fixing frame 4, the support base 5, the channel 7, the rotating shaft 9, the handle 2, and the support feet 13, the griddle can be provided with a foldable and collapsible function, which is convenient for users to unfold during use and fold and place during storage; in the unfolded state, both sides of the outer casing 1 can effectively touch the ground, improving stability; in the folded and stored state, it is convenient for users to carry and move;

[0042] Specifically, during folding and storage, the user grasps the handle 2 and rotates it 90°, and the rotating shaft 9 at the outer casing 1 slides into the bottom of the channel 7 and is stuck, so that the two outer casings 1 rotate and close together to form a box structure; then, through the handle 2, it is convenient for the user to grasp and carry the entire griddle;

[0043] When it needs to be unfolded, the user gently lifts the outer casing 1 upward, so that the rotating shaft 9 of the outer casing 1 moves to the upper part of the channel 7 for positioning, and then rotates 90°, so that the two outer casings 1 are unfolded; in the unfolded state, the support feet 13 of the outer casing 1 contact the ground or the tabletop to perform two-side support and fixation, improving stability.

[0044] Please refer to Figure 3 , both sides of the lower surface of the fixing frame 4 are provided with bottom feet 14, and a wire winding frame 8 is installed on the outer wall of one side of the fixing frame 4;

[0045] The bottom feet 14 are used to support on the tabletop to make the fixing frame 4 more stable and firm when placed; the wire winding frame 8 is used for the wire harness to perform wire winding operations, which is convenient for users to carry and store the wire harness.

[0046] Please refer to Figure 2 , Figure 4 , an oil box 10 is detachably installed on the lower surface of the support base 5, and a griddle pan 3 is arranged above the inside of the outer casing 1;

[0047] The oil box 10 is used to facilitate the user to place oil; the frying pan 3 is located inside the outer housing 1. After the outer housing 1 is unfolded, the internal frying pan 3 is exposed outside, facilitating the user to use for frying and grilling.

[0048] Please refer to Figure 4 , a junction box 11 is detachably installed on the outer wall of the outer housing 1 through screws, and a knob 12 is arranged on one side of the junction box 11;

[0049] The junction box 11 is used to achieve the effect of wiring; the knob 12 is used to connect the electrical control components inside the outer housing 1 for controlling operations such as temperature; this structure is a conventional and mature technology for frying pans in this field, and the present invention does not make innovations in its control part, so it will not be elaborated further.

[0050] Please refer to Figure 5 , a threaded groove 15 is arranged inside the support foot 13, an assembly column 16 is installed inside the threaded groove 15, threaded sections 17 and insertion sections 18 are respectively arranged at both ends of the assembly column 16, and one end of the assembly column 16 is assembled with the threaded groove 15 through the threaded section 17;

[0051] A bottom block 19 is arranged at the lower end of the insertion section 18, an insertion groove 20 is arranged on the outer wall of the upper surface of the bottom block 19, and the assembly column 16 is combined with the insertion groove 20 through the insertion section 18. A rubber cushion block 21 is bonded on the outer wall of the lower surface of the bottom block 19;

[0052] Through the settings of the threaded groove 15, the assembly column 16, the threaded section 17, the insertion section 18, the bottom block 19, the insertion groove 20, and the rubber cushion block 21, when the frying pan is unfolded and placed, further adjustment can be carried out for the support foot 13, so that the extension length of the support foot 13 of the frying pan can be adjusted according to the height difference, making the frying pan placed more stable and firm, and the adjustment process does not require the aid of external tools, facilitating user use;

[0053] Specifically, after the frying pan is rotated and unfolded horizontally, the user grasps and rotates the bottom block 19 to rotate the threaded section 17 of the assembly column 16 to the outside of the insertion groove 20. By rotation, the extended part of the assembly column 16 increases. According to different height differences, the extended part lengths of different support feet 13 are also adjusted adaptively. Finally, the support feet 13 of the frying pan are stably placed on the tabletop or the ground. At the same time, the rubber cushion block 21 contacts the tabletop or the ground, increasing the friction force and improving the anti-slip property, further improving the stability of the frying pan;

[0054] In the storage state, reverse the bottom block 19, screw the threaded section 17 of the assembly column 16 into the threaded groove 15, so that the bottom block 19 is close to the bottom of the support foot 13, reducing the protruding extended space at the support foot 13, facilitating the carrying and storage operations.

[0055] Please refer toFigure 2 On the outer walls of the docking ends of the two handles 2, a docking groove 22 and a docking block 23 are respectively provided, and the two handles 2 are assembled and installed through the docking groove 22 and the docking block 23;

[0056] When the two handles 2 are rotationally docked, the docking block 23 at one side handle 2 will be inserted into the docking groove 22 of the other side handle 2, so that the two handles 2 are stably and firmly combined together; when it is necessary to rotate and open, the two handles 2 are pulled apart to both sides respectively, so that the docking block 23 is disengaged and separated from the docking groove 22; the above structure can improve the combined assembly stability at the handle 2 in the storage state, and this structure is convenient for subsequent disassembly and separation, facilitating user use and operation.

[0057] Please refer to Figure 6 , an inner installation layer 24 is arranged inside the outer shell 1, an electric heater 25 is arranged inside the inner installation layer 24, a bracket 26 is arranged below the frying pan 3, a support rod 27 is installed below the bracket 26, and the lower end of the support rod 27 is combined and installed with the bottom of the inner installation layer 24 through screws;

[0058] The electric heater 25 is used to heat the frying pan 3; the bracket 26 is used to limit the placement position of the frying pan 3, so that the edge of the frying pan 3 is placed on the bracket 26, facilitating the user to subsequently take out the frying pan 3 for cleaning and replacement; the support rod 27 is used to support the bracket 26, making the bracket 26 more stable and firm.

[0059] Please refer to Figure 7 , Figure 8 , at the four corners of the outer wall of the bracket 26, combination grooves 28 are respectively provided, a first card slot 29 is arranged at the bottom inside the combination groove 28, a second card slot 30 is arranged on the inner wall of the combination groove 28, at the four corners of the outer wall of the lower surface of the frying pan 3, foot posts 31 are respectively provided, a first card block 32 is arranged at the lower end of the foot post 31, and the first card block 32 is engaged with the first card slot 29, a second card block 33 is arranged on the outer wall of the foot post 31, and the second card block 33 is engaged with the second card slot 30;

[0060] Through the settings of the bracket 26, the combination groove 28, the first card slot 29, the second card slot 30, the foot post 31, the first card block 32, and the second card block 33, the frying pan 3 can be made more firm during storage or placement, avoiding the frying pan 3 from falling, and this structure also facilitates the user to quickly take out and remove the frying pan 3, with the overall structure being simple and convenient for user operation;

[0061] Specifically, in the placed state, align the feet 31 of the griddle pan 3 with the combination slots 28, and press down the griddle pan 3 so that the feet 31 are inserted into the combination slots 28. After the feet 31 are inserted into the combination slots 28, the first locking block 32 will be embedded and engaged in the first locking slot 29. At the same time, the second locking block 33 is engaged with the second locking slot 30, so that the griddle pan 3 is firmly placed on the bracket 26 and will not fall off in the folded and stored state;

[0062] When disassembling and replacing the griddle pan 3, after the griddle pan 3 cools down, pull up the griddle pan 3 so that the first locking block 32 and the second locking block 33 are respectively disengaged and separated from the first locking slot 29 and the second locking slot 30, so that the feet 31 can be disengaged from the combination slots 28, which is convenient for users to use;

[0063] More specifically, the second locking block 33 is made of rubber and has elasticity. When pulling up the griddle pan 3, the second locking block 33 will deform, so that the second locking block 33 can be separated from the second locking slot 30. Similarly, when inserting downward, the second locking block 33 is in a compressed state. After the second locking block 33 moves to the second locking slot 30, the lateral pressure disappears, and the second locking block 33 rebounds and is inserted into the second locking slot 30.

[0064] Working principle: When folding and storing, the user grasps the handle 2 and rotates it 90°. The rotating shaft 9 on the outer housing 1 slides into the bottom of the groove 7 and is stuck, so that the two outer housings 1 rotate and close together to form a box structure; then, the user can conveniently grasp and carry the entire griddle through the handle 2;

[0065] When it needs to be unfolded, the user gently lifts up the outer housing 1 so that the rotating shaft 9 of the outer housing 1 moves to the upper part of the groove 7 for positioning, and then rotates 90° to unfold the two outer housings 1; in the unfolded state, the support feet 13 of the outer housing 1 contact the ground or the tabletop for two-side support and fixation to improve stability;

[0066] After the griddle rotates and unfolds horizontally, the user grasps and rotates the bottom block 19, so that the threaded section 17 of the assembly post 16 rotates outward from the insertion groove 20. By rotating, the extended part of the assembly post 16 increases. According to different height differences, the lengths of the extended parts at different support feet 13 are also adjusted adaptively, so that the support feet 13 of the griddle are finally placed stably on the tabletop or the ground. At the same time, the rubber cushion block 21 contacts the tabletop or the ground, increasing the friction force and improving the anti-slip property, further improving the stability of the griddle;

[0067] In the stored state, reverse the bottom block 19, screw the threaded section 17 of the assembly post 16 into the threaded groove 15, so that the bottom block 19 is close to the bottom of the support foot 13, reducing the protruding extended space at this support foot 13, which is convenient for carrying and storing operations;

[0068] In the placed state, align the feet 31 of the frying pan 3 with the combination slots 28, and press down the frying pan 3 so that the feet 31 are inserted into the combination slots 28. After the feet 31 are inserted into the combination slots 28, the first locking blocks 32 will be embedded and engaged in the first locking slots 29. At the same time, the second locking blocks 33 are engaged with the second locking slots 30, so that the frying pan 3 is firmly placed on the bracket 26 and will not fall off in the folded and stored state;

[0069] When disassembling and replacing the frying pan 3, after the frying pan 3 cools down, pull up the frying pan 3 so that the first locking blocks 32 and the second locking blocks 33 are respectively disengaged and separated from the first locking slots 29 and the second locking slots 30, so that the feet 31 can be disengaged from the combination slots 28, which is convenient for users to use.

[0070] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. Foldable and collapsible griddle, comprising an outer housing (1), and there are two left and right outer housings (1), and a support base (5) is installed below the outer housing (1); It is characterized in that: It further comprises: A fixing frame (4), which is arranged on both sides of the support base (5). Support pieces (6) are arranged on the inner wall of the fixing frame (4). There are two left and right channel grooves (7) arranged on the outer wall of the support piece (6), and the channel grooves (7) are narrow at the bottom and wide at the top. A rotating shaft (9) is arranged between the channel groove (7) and the outer housing (1). One end of the outer housing (1) is provided with a handle (2), and a plurality of support feet (13) are arranged at the upper end of the outer wall of the outer housing (1).

2. The foldable and storable griddle according to claim 1, wherein: Bottom feet (14) are arranged on both sides of the lower surface of the fixing frame (4), and a wire winding frame (8) is installed on the outer wall of one side of the fixing frame (4).

3. The foldable and collapsible griddle according to claim 1, wherein: An oil box (10) is detachably installed on the lower surface of the support base (5), and a griddle pan (3) is arranged above the inner part of the outer housing (1).

4. The folding and storage griddle according to claim 1, wherein: A junction box (11) is detachably installed on the outer wall of the outer housing (1) by screws, and a knob (12) is arranged on one side of the junction box (11).

5. The folding and storage griddle according to claim 1, characterized in that: A threaded groove (15) is arranged inside the support foot (13), an assembly column (16) is installed inside the threaded groove (15), threaded sections (17) and insertion sections (18) are respectively arranged at both ends of the assembly column (16), and one end of the assembly column (16) is assembled with the threaded groove (15) through the threaded section (17).

6. The foldable and storable griddle according to claim 5, wherein: A bottom block (19) is arranged at the lower end of the insertion section (18). An insertion groove (20) is arranged on the outer wall of the upper surface of the bottom block (19), and the assembly column (16) is combined with the insertion groove (20) through the insertion section (18). A rubber cushion block (21) is bonded on the outer wall of the lower surface of the bottom block (19).

7. The foldable and collapsible griddle according to claim 1, wherein: Docking grooves (22) and docking blocks (23) are respectively arranged on the outer walls of the docking ends of the two handles (2), and the two handles (2) are assembled and installed through the docking grooves (22) and the docking blocks (23).

8. The folding and storage griddle according to claim 3, characterized in that: An inner installation layer (24) is arranged inside the outer housing (1). An electric heater (25) is arranged inside the inner installation layer (24). A bracket (26) is arranged below the griddle pan (3). A support rod (27) is installed below the bracket (26), and the lower end of the support rod (27) is assembled with the bottom of the inner installation layer (24) by screws.

9. The foldable and collapsible griddle according to claim 8, wherein: Combination grooves (28) are arranged at the four corners of the outer wall of the bracket (26). First clamping grooves (29) are arranged at the bottom of the combination grooves (28). Second clamping grooves (30) are arranged on the inner walls of the combination grooves (28). Foot columns (31) are arranged at the four corners of the outer wall of the lower surface of the griddle pan (3). First clamping blocks (32) are arranged at the lower ends of the foot columns (31), and the first clamping blocks (32) are clamped with the first clamping grooves (29). Second clamping blocks (33) are arranged on the outer walls of the foot columns (31), and the second clamping blocks (33) are clamped with the second clamping grooves (30).

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