Solid electric heat storage equipment capable of simultaneously meeting 110kv and 10kv voltage grades

Abstract

The invention relates to the technical field of solid electric heat storage, in particular to solid electric heat storage equipment capable of simultaneously meeting 110kv and 10kv voltage classes, which comprises a shell, a heat-insulating layer, a heat-insulating layer, a heat-insulating layer, a heat-insulating layer, a heat-insulating layer, a heat-insulating layer and a heat-insulating layer, a sealing plate is arranged at the end of the partition plate, a motor is arranged at the top of the sealing plate, a lead screw is arranged on the surface of the sealing plate, an extension plate is arranged at the end of the partition plate, an open groove and a limiting groove are formed in the surface of the partition plate, and a first bearing rod and a second bearing rod are arranged in the shell; the lower pressing plate is arranged on the surfaces of the first bearing rod and the second bearing rod; the device has the beneficial effects that an inserting rod is inserted into an inserting groove, a fixing block is jacked due to jacking of the inserting rod, a second rolling wheel can make contact with the inner wall of the shell, when the fixing block moves to the position of an arc-shaped rod, the fixing block is not jacked, the fixing block is retracted inwards, an elastic strip is jacked in the shell, and the sealing effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid electric heat storage, and in particular to a solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv. Background Art

[0002] Solid electric thermal storage devices are used to store "valley electricity" in the form of heat, and when needed, the heat is taken out through a heat exchanger for industrial and civil use, such as industrial and civil heating, equipment heating, etc., to achieve the purpose of reasonable use and energy conservation, reduce production costs, reduce harmful gas emissions from traditional heating, and reduce environmental pollution. When performing heat storage, the electric energy is stored after generating heat through the heating wire;

[0003] In the prior art, when using 10kv voltage, it can be divided into multiple incoming lines, each group of incoming lines is divided into three phases A, B, and C, each stack of thermal storage body is one phase, and the phase spacing is greater than 200mm. When it is necessary to switch to 110kv voltage, only the incoming line needs to be replaced. There is only one incoming line for 110kv voltage.

[0004] However, the number of heat storage bricks inside the existing solid electric heat storage equipment is fixed. When the temperature of the heat storage bricks needs to be quickly increased, the heating power can only be increased, resulting in greater consumption, and the heating speed cannot be significantly improved. Summary of the invention

[0005] The object of the present invention is to provide a solid electric heat storage device that can simultaneously meet the 110kv and 10kv voltage levels, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv, comprising:

[0007] An outer shell, wherein a heat insulating layer is arranged inside the outer shell;

[0008] A partition, a sealing plate is arranged at the end of the partition, a motor is arranged on the top of the sealing plate, a screw is arranged on the surface of the sealing plate, an extension plate is arranged at the end of the partition, a slot and a limit slot are arranged on the surface of the partition, a first supporting rod and a second supporting rod are arranged inside the shell; and a lower pressure plate is arranged on the surface of the first supporting rod and the second supporting rod.

[0009] Preferably, a heating plate is provided on the outside of the shell, and there are multiple groups of heating plates. A sealing groove is provided on the surface of the shell. A through groove is opened on the surface of the shell, and there are multiple groups of through grooves. The partition can be inserted into the through groove and the partition can move in the through groove. A limiting rod is fixed to the bottom of the sealing plate, and the other end of the limiting rod is inserted into the interior of the shell, and the limiting rod can be telescopically moved inside the shell, and the limiting rod moves with the sealing plate.

[0010] Preferably, two groups of motors are fixed on the top of the sealing plate, two groups of extension blocks are fixed on the surface of the sealing plate, a first roller is provided at the bottom of the extension block, the first roller can roll at the bottom of the extension block, and both the extension block and the first roller move with the sealing plate.

[0011] Preferably, a sealing strip is provided on the surface of the sealing plate, and the sealing strip moves with the sealing plate. When the sealing plate is held against the surface of the outer shell, the sealing strip is stuck in a sealing groove on the surface of the outer shell, and two groups of grooves are opened on the surface of the sealing plate, and a screw rod is provided in the groove, and the screw rod can rotate in the groove, and the motor can drive the screw rod to rotate.

[0012] Preferably, two groups of extension plates are fixed on the surface of the partition, the extension plates are inserted in the grooves on the surface of the sealing plate, and the screw rod is located inside the extension plates. When the screw rod rotates, the extension plates can be raised and lowered on the surface of the screw rod, and the partition moves up and down with the extension plates. The force block is inserted on the surface of the partition, an air bag is provided at the bottom of the force block, and an elastic strip is fixed to the end of the partition, and a plug-in groove is provided inside the elastic strip.

[0013] Preferably, the interior of the elastic strip is hollow, the interior of the elastic strip is connected to the interior of the airbag, the air inside the airbag can enter the interior of the elastic strip, the elastic strip can be deformed, a fixed block is fixed on the surface of the elastic strip, a groove is provided on the surface of the fixed block, a second roller is provided in the groove, and the second roller can rotate in the groove.

[0014] Preferably, an inner groove is provided on the surface of the thermal insulation layer, a vertical groove is provided on the inner wall of the inner groove, a second supporting rod is inserted in the vertical groove, both ends of the second supporting rod are inserted in the vertical grooves on both sides of the inner groove, and the second supporting rod can be lifted and moved in the vertical groove, multiple groups of second supporting rods are provided, multiple groups of first supporting rods are fixed on the surface of the second supporting rods, and heat storage bricks are placed on the top of the first supporting rods and the second supporting rods.

[0015] Preferably, a limiting strip is fixed to the bottom of the first supporting rod and the second supporting rod, the limiting strip can be inserted into the slot and the limiting groove, and the limiting strip can move in the limiting groove, and the cross-sections of the limiting strip and the limiting groove are both T-shaped.

[0016] Preferably, a first card slot and a second card slot are provided at the bottom of the heat storage brick, the first card slot can be clamped on the surface of the first supporting rod, and the second card slot can be clamped on the surface of the second supporting rod.

[0017] Preferably, two groups of lower pressure plates are fixed at the ends of the first supporting rod and the second supporting rod. When the partition is inserted into the interior of the shell, the partition is located between the two groups of first supporting rods and second supporting rods, and the lower pressure plate presses down on the surface of the force-bearing block, so that the force-bearing block moves downward, and the airbag at the bottom of the force-bearing block is squeezed, so that the air in the airbag enters the interior of the elastic strip. A plug-in rod is fixed to the interior of the shell. When the partition is inserted into the interior of the shell, the plug-in rod is inserted into the plug-in groove. Multiple groups of arc rods are fixed to the surface of the plug-in rod, and the arc rod is inserted into the plug-in groove along with the plug-in rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The plug-in rod proposed in the present invention is plugged into the plug-in slot. Due to the support of the plug-in rod, the fixed block is supported, and the second roller can contact the inner wall of the shell. When the fixed block moves to the position of the arc rod, the fixed block lacks support, so that the fixed block is retracted, and the elastic strip is supported inside the shell to play a sealing role. The interior of the shell is divided into smaller spaces by partitions. Only a small number of heating plates need to be started, and the temperature can be quickly raised in a small space, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 This is a structural schematic diagram from another viewing angle of the present invention.

[0022] Figure 3 It is a schematic diagram of the top view structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the partition structure of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the splice rod of the present invention.

[0025] Figure 6 for Figure 1 A schematic diagram of the enlarged structure in the middle.

[0026] Figure 7 It is a schematic diagram of the supporting rod structure of the present invention.

[0027] Figure 8 This is a schematic diagram of the heat storage brick structure of the present invention.

[0028] Fig. 9 It is a schematic diagram of the elastic strip structure of the present invention.

[0029] Fig.10 It is a schematic diagram of a partially enlarged structure of the elastic strip of the present invention.

[0030] In the figure: shell 1, insulation layer 2, heating plate 3, through groove 4, sealing groove 5, limit rod 6, first roller 7, extension block 8, sealing plate 9, motor 10, slot 11, partition 12, limit groove 13, force block 14, extension plate 15, screw 16, sealing strip 17, plug-in rod 18, arc rod 19, inner groove 20, vertical groove 21, first supporting rod 23, second supporting rod 24, limit strip 25, lower pressure plate 26, heat storage brick 27, first slot 28, elastic strip 29, plug-in slot 30, second roller 31, groove 32, fixing block 33, second slot 34. DETAILED DESCRIPTION

[0031] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figures 1 to 10 , the present invention provides a technical solution:

[0033] Embodiment 1: A solid electric heat storage device that can meet both 110kv and 10kv voltage levels, comprising: a housing 1, an insulation layer 2 is arranged inside the housing 1; a partition 12, a sealing plate 9 is arranged at the end of the partition 12, a motor 10 is arranged on the top of the sealing plate 9, a screw rod 16 is arranged on the surface of the sealing plate 9, an extension plate 15 is arranged at the end of the partition 12, a slot 11 and a limit slot 13 are arranged on the surface of the partition 12, and a first supporting rod 23 is arranged inside the housing 1 and a second supporting rod 24; and a lower pressure plate 26, which are arranged on the surfaces of the first supporting rod 23 and the second supporting rod 24, the surface of the second supporting rod 24 is fixed with the first supporting rod 23, the first supporting rod 23 and the second supporting rod 24 are provided with multiple groups, and heat storage bricks 27 are placed on the top of the first supporting rod 23 and the second supporting rod 24, the first card groove 28 at the bottom of the heat storage brick 27 is stuck on the surface of the second supporting rod 24, and the second card groove 34 at the bottom of the heat storage brick 27 is stuck on the surface of the first supporting rod 23.

[0034] Embodiment 2: On the basis of embodiment 1, a heating plate 3 is provided on the outside of the shell 1, and the heating plate 3 is provided in multiple groups. A sealing groove 5 is provided on the surface of the shell 1. A through groove 4 is opened on the surface of the shell 1, and the through groove 4 is provided in multiple groups. The partition 12 can be inserted into the through groove 4, and the partition 12 can move in the through groove 4. A limiting rod 6 is fixed to the bottom of the sealing plate 9, and the other end of the limiting rod 6 is inserted into the inside of the shell 1, and the limiting rod 6 can be telescopically moved inside the shell 1, and the limiting rod 6 moves with the sealing plate 9. Two groups of extension plates 15 are fixed on the surface of the partition 12, and the extension plate 15 is inserted in the groove on the surface of the sealing plate 9, and the screw rod 16 is located inside the extension plate 15. When the screw rod 16 rotates, the extension plate 15 can be lifted and lowered on the surface of the screw rod 16, and the partition 12 is lifted and lowered along with the extension plate 15. The force block 14 is inserted into the surface of the partition 12. An airbag is provided at the bottom, and an elastic strip 29 is fixed at the end of the partition 12. A plug-in groove 30 is provided inside the elastic strip 29. The interior of the elastic strip 29 is empty. The interior of the elastic strip 29 is communicated with the interior of the airbag. The air inside the airbag can enter the interior of the elastic strip 29, and the elastic strip 29 can be deformed. A fixing block 33 is fixed on the surface of the elastic strip 29. A groove 32 is provided on the surface of the fixing block 33. A second roller 31 is provided in the groove 32. The second roller 31 can rotate in the groove 32. The second roller 31 in the groove 32 on the surface of the fixing block 33 can roll. During the movement of the partition 12, the second roller 31 is supported inside the shell 1 to prevent the elastic strip 29 from being scratched. The plug-in rod 18 is plugged into the plug-in groove 30. Due to the support of the plug-in rod 18, the fixing block 33 is supported, and the second roller 31 can contact the inner wall of the shell 1.

[0035] The surface of the heat insulation layer 2 is provided with an inner groove 20, and the inner wall of the inner groove 20 is provided with a vertical groove 21, and a second supporting rod 24 is inserted in the vertical groove 21, and the two ends of the second supporting rod 24 are inserted in the vertical grooves 21 on both sides of the inner groove 20, and the second supporting rod 24 can be lifted and moved in the vertical grooves 21, and multiple groups of second supporting rods 24 are provided, and multiple groups of first supporting rods 23 are fixed on the surface of the second supporting rods 24, and heat storage bricks 27 are placed on the top of the first supporting rods 23 and the second supporting rods 24 The first supporting rod 23 and the second supporting rod 24 are fixed with a limiting strip 25 at their bottoms, the limiting strip 25 can be inserted into the slot 11 and the limiting slot 13, and the limiting strip 25 can move in the limiting slot 13, the limiting strip 25 and the limiting slot 13 are both T-shaped in cross-section, and the bottom of the heat storage brick 27 is provided with a first card slot 28 and a second card slot 34, the first card slot 28 can be stuck on the surface of the first supporting rod 23, the second card slot 34 can be stuck on the surface of the second supporting rod 24, and the first card slot 28 can be stuck on the surface of the second supporting rod 24. Two sets of lower pressure plates 26 are fixed at the ends of a supporting rod 23 and a second supporting rod 24. When the partition 12 is inserted into the interior of the shell 1, the partition 12 is located between the two sets of first supporting rods 23 and second supporting rods 24. The lower pressure plate 26 presses down on the surface of the force block 14, so that the force block 14 moves downward, and the air bag at the bottom of the force block 14 is squeezed, so that the air in the air bag enters the interior of the elastic strip 29. The plug-in rod 18 is fixed inside the shell 1, and the partition 12 is inserted into the shell. 1, the plug rod 18 is inserted into the plug groove 30, and multiple groups of arc rods 19 are fixed on the surface of the plug rod 18. The arc rod 19 is inserted into the plug groove 30 as the plug rod 18 is inserted into the plug groove 30. The plug rod 18 is inserted into the plug groove 30. Due to the support of the plug rod 18, the fixing block 33 is supported, and the second roller 31 can contact the inner wall of the shell 1. When the fixing block 33 moves to the position of the arc rod 19, the fixing block 33 lacks support, so that the fixing block 33 is retracted.

[0036] Two groups of motors 10 are fixed on the top of the sealing plate 9, two groups of extension blocks 8 are fixed on the surface of the sealing plate 9, and a first roller 7 is arranged at the bottom of the extension block 8. The first roller 7 can roll at the bottom of the extension block 8, and both the extension block 8 and the first roller 7 move with the sealing plate 9.

[0037] A sealing strip 17 is provided on the surface of the sealing plate 9. The sealing strip 17 moves with the sealing plate 9. When the sealing plate 9 is held against the surface of the outer shell 1, the sealing strip 17 is stuck in the sealing groove 5 on the surface of the outer shell 1, and two groups of grooves are opened on the surface of the sealing plate 9. A screw rod 16 is provided in the groove. The screw rod 16 can rotate in the groove. The motor 10 can drive the screw rod 16 to rotate. Multiple groups of heat storage bricks 27 are located at the top of the first supporting rod 23 and the second supporting rod 24. The screw rod 16 is driven to rotate by the motor 10, so that the extension plate 15 is lifted and lowered, and the extension plate 15 drives the partition 12 to lift and lower.

[0038] The end of the second supporting rod 24 is located in the vertical groove 21 of the inner wall of the inner groove 20, the first supporting rod 23 is fixed to the surface of the second supporting rod 24, and the first supporting rod 23 and the second supporting rod 24 are provided with multiple groups, and the top of the first supporting rod 23 and the second supporting rod 24 is placed with heat storage bricks 27, and the first card groove 28 at the bottom of the heat storage brick 27 is stuck on the surface of the second supporting rod 24, and the second card groove 34 at the bottom of the heat storage brick 27 is stuck on the surface of the first supporting rod 23. Multiple groups of heat storage bricks 27 are located at the top of the first supporting rod 23 and the second supporting rod 24, and are driven by the motor 10. The movable screw 16 rotates to make the extension plate 15 move up and down, and the extension plate 15 drives the partition 12 to move up and down. The first roller 7 rotates to make the partition 12 move. The partition 12 is inserted into the through groove 4. The limit rod 6 is inserted into the interior of the shell 1 to play a limiting role. The through groove 4 is provided with multiple groups. The partition 12 has a heat insulation effect, which divides the interior of the shell 1 into a smaller space. When the partition 12 enters the shell 1, the limit bar 25 is inserted into the slot 11, and the limit bar 25 moves in the limit groove 13, so that the limit bar 25 is stuck in the limit groove 13. After the partition 12 continues to move, the lower pressure plate 26 is pressed down on the surface of the force block 14, and the two ends of the second supporting rod 24 can rise in the vertical groove 21. The gravity of the heat storage bricks 27 on the top of the first supporting rod 23 and the second supporting rod 24 presses down the force block 14. The bottom of the force block 14 is provided with an air bag, which is connected to the inside of the elastic strip 29, so that the gas in the air bag enters the inside of the elastic strip 29, and the second roller 31 in the groove 32 on the surface of the fixed block 33 can roll. During the movement of the partition 12, the second roller 31 is held on the outer shell 1. Inside, the elastic strip 29 is prevented from being scratched, and the plug-in rod 18 is inserted into the plug-in groove 30. Due to the support of the plug-in rod 18, the fixed block 33 is supported, and the second roller 31 can contact the inner wall of the shell 1. When the fixed block 33 moves to the position of the arc rod 19, the fixed block 33 lacks support, so that the fixed block 33 is retracted, and the elastic strip 29 is supported inside the shell 1 to play a sealing role. The interior of the shell 1 is divided into a smaller space through the partition 12. Only a small number of heating plates 3 need to be started, and the temperature can be quickly raised in a small space, saving energy.

[0039] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A solid electric heat storage device that can meet both 110kv and 10kv voltage levels, characterized in that: include: An outer shell (1), wherein a heat insulating layer (2) is arranged inside the outer shell (1); A partition (12), a sealing plate (9) is arranged at the end of the partition (12), a motor (10) is arranged on the top of the sealing plate (9), a screw rod (16) is arranged on the surface of the sealing plate (9), an extension plate (15) is arranged at the end of the partition (12), a groove (11) and a limit groove (13) are arranged on the surface of the partition (12), a first supporting rod (23) and a second supporting rod (24) are arranged inside the housing (1); and a lower pressure plate (26) is arranged on the surface of the first supporting rod (23) and the second supporting rod (24).

2. According to claim 1, a solid electric heat storage device that can simultaneously meet the 110kv and 10kv voltage levels is characterized in that: The outer part of the shell (1) is provided with a heating plate (3), and the heating plate (3) is provided in multiple groups. The surface of the shell (1) is provided with a sealing groove (5). The surface of the shell (1) is provided with a through groove (4), and the through groove (4) is provided in multiple groups. The partition (12) can be inserted into the through groove (4), and the partition (12) can move in the through groove (4). The bottom of the sealing plate (9) is fixed with a limiting rod (6), and the other end of the limiting rod (6) is inserted into the inside of the shell (1), and the limiting rod (6) can be telescopically moved inside the shell (1), and the limiting rod (6) moves with the sealing plate (9).

3. A solid electric heat storage device that can simultaneously meet the 110kv and 10kv voltage levels according to claim 2, characterized in that: Two groups of motors (10) are fixed on the top of the sealing plate (9), two groups of extension blocks (8) are fixed on the surface of the sealing plate (9), and a first roller (7) is arranged at the bottom of the extension block (8). The first roller (7) can roll at the bottom of the extension block (8), and the extension block (8) and the first roller (7) both move with the sealing plate (9).

4. The solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv according to claim 3 is characterized in that: The surface of the sealing plate (9) is provided with a sealing strip (17), and the sealing strip (17) moves with the sealing plate (9). When the sealing plate (9) is supported on the surface of the housing (1), the sealing strip (17) is stuck in a sealing groove (5) on the surface of the housing (1), and two groups of grooves are opened on the surface of the sealing plate (9), and screw rods (16) are arranged in the grooves. The screw rods (16) can rotate in the grooves, and the motor (10) can drive the screw rods (16) to rotate.

5. The solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv according to claim 4 is characterized in that: Two groups of extension plates (15) are fixed on the surface of the partition (12). The extension plates (15) are inserted into the grooves on the surface of the sealing plate (9), and the screw rod (16) is located inside the extension plates (15). When the screw rod (16) rotates, the extension plates (15) can be lifted and lowered on the surface of the screw rod (16), and the partition (12) moves up and down along with the extension plates (15). The force block (14) is inserted into the surface of the partition (12), and an air bag is arranged at the bottom of the force block (14). An elastic strip (29) is fixed to the end of the partition (12), and a plug-in groove (30) is arranged inside the elastic strip (29).

6. The solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv according to claim 5, characterized in that: The interior of the elastic strip (29) is hollow, the interior of the elastic strip (29) is communicated with the interior of the airbag, the air inside the airbag can enter the interior of the elastic strip (29), the elastic strip (29) can be deformed, a fixing block (33) is fixed on the surface of the elastic strip (29), a groove (32) is provided on the surface of the fixing block (33), a second roller (31) is arranged in the groove (32), and the second roller (31) can rotate in the groove (32).

7. The solid electric heat storage device according to claim 6 that can simultaneously meet the voltage levels of 110kv and 10kv, characterized in that: The surface of the heat insulating layer (2) is provided with an inner groove (20), the inner wall of the inner groove (20) is provided with a vertical groove (21), a second supporting rod (24) is inserted into the vertical groove (21), both ends of the second supporting rod (24) are inserted into the vertical grooves (21) on both sides of the inner groove (20), and the second supporting rod (24) can be lifted and moved in the vertical grooves (21), multiple groups of second supporting rods (24) are provided, multiple groups of first supporting rods (23) are fixed on the surface of the second supporting rods (24), and heat storage bricks (27) are placed on the top of the first supporting rods (23) and the second supporting rods (24).

8. The solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv according to claim 7 is characterized in that: A limiting strip (25) is fixed at the bottom of the first supporting rod (23) and the second supporting rod (24); the limiting strip (25) can be inserted into the slot (11) and the limiting groove (13), and the limiting strip (25) can move in the limiting groove (13); and the cross-sections of the limiting strip (25) and the limiting groove (13) are both T-shaped.

9. The solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv according to claim 8, characterized in that: The bottom of the heat storage brick (27) is provided with a first card slot (28) and a second card slot (34); the first card slot (28) can be clamped on the surface of the first supporting rod (23); the second card slot (34) can be clamped on the surface of the second supporting rod (24); the second card slot (34) at the bottom of the heat storage brick (27) is clamped on the surface of the first supporting rod (23); and a plurality of groups of heat storage bricks (27) are located on the top of the first supporting rod (23) and the second supporting rod (24).

10. The solid electric heat storage device that can simultaneously meet the voltage levels of 110kv and 10kv according to claim 9, characterized in that: Two groups of lower pressure plates (26) are fixed at the ends of the first supporting rod (23) and the second supporting rod (24). When the partition (12) is inserted into the interior of the shell (1), the partition (12) is located between the two groups of first supporting rods (23) and the second supporting rod (24). The lower pressure plate (26) presses down on the surface of the force-bearing block (14), so that the force-bearing block (14) moves downward, and the air bag at the bottom of the force-bearing block (14) is squeezed, so that the air in the air bag enters the interior of the elastic strip (29). A plug-in rod (18) is fixed inside the shell (1). When the partition (12) is inserted into the interior of the shell (1), the plug-in rod (18) is inserted into the plug-in groove (30). Multiple groups of arc rods (19) are fixed on the surface of the plug-in rod (18). The arc rod (19) is inserted into the plug-in groove (30) along with the plug-in rod (18).

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