Closed calcium carbide furnace calcium carbide discharge automatic oxygen blowing device

Abstract

The utility model discloses a closed calcium carbide furnace calcium carbide discharge automatic oxygen blowing device which comprises a main shaft part control shaft drill rod, a robot grabbing part is arranged at one end of the main shaft part control shaft drill rod, and a supporting part supporting seat and a fixing part fixing seat are fixedly connected to the main shaft part control shaft drill rod. An auxiliary transmission guide part pulley block is clamped on the main shaft part control shaft drill rod, the auxiliary transmission guide part pulley block is arranged between the supporting part supporting seat and the fixing part fixing seat, and an oxygen tube is arranged on the auxiliary transmission guide part pulley block, the supporting part supporting seat and the fixing part fixing seat in a penetrating manner. According to the closed calcium carbide furnace calcium carbide discharge automatic oxygen blowing device, the oxygen blowing operation efficiency is improved, and the risk that in the operation process, calcium carbide at the furnace mouth splashes, and people are scalded is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen blowing equipment for calcium carbide furnaces, and in particular relates to an automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace. Background Art

[0002] Calcium carbide is prepared by mixing burnt quicklime and dried lignite into the furnace of the calcium carbide furnace. The charge is heated to about 2200℃ by the electric arc emitted by three electrodes in the furnace and melted into liquid calcium carbide. It flows from the furnace mouth into the calcium carbide pot and is pulled to the cooling workshop by a winch for cooling on a trolley out of the furnace.

[0003] In the process of liquid calcium carbide flowing from the mouth of the calcium carbide furnace into the calcium carbide pot, due to the large temperature difference between the liquid calcium carbide and the mouth of the furnace, the fluidity of the calcium carbide is reduced, or abnormalities occur in the production process, and oxygen blowing is required to assist in the furnace discharge. The current practice is to rely on manual work. 2-3 people wearing a full set of protective equipment enter the isolation area, hold an oxygen tube and send the oxygen tube into the furnace mouth to continuously blow oxygen until the furnace discharge is smooth. However, the existing practice has the following problems: first, the working space is small, and the position opposite the furnace mouth is the furnace discharge robot device, which limits the scope of oxygen blowing; second, there is a splash of calcium carbide at the furnace mouth during the oxygen blowing process, which can easily cause a risk of scalding to personnel. The entire operation efficiency is low, and the safety of personnel is not guaranteed, which causes the temperature of the calcium carbide to decrease, resulting in a decrease in the fluidity of the calcium carbide, a decrease in the efficiency of the calcium carbide discharge, and an increase in the discharge time. Utility Model Content

[0004] The utility model aims to provide an automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace, which improves the oxygen blowing operation efficiency and avoids the risk of scalding personnel caused by calcium carbide splashing at the furnace mouth during the operation.

[0005] The technical solution adopted by the utility model is an automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace, comprising a main shaft part control shaft drill, one end of the main shaft part control shaft drill is provided with a robot grasping portion, a supporting seat of a supporting part and a fixing seat of a fixing part are fixedly connected to the main shaft part control shaft drill, an auxiliary transmission guide part pulley block is clamped on the main shaft part control shaft drill, the auxiliary transmission guide part pulley block is arranged between the supporting seat of the supporting part and the fixing seat of the fixing part, and an oxygen tube is commonly penetrated through the auxiliary transmission guide part pulley block, the supporting seat of the supporting part and the fixing seat of the fixing part.

[0006] The utility model is also characterized in that:

[0007] The pulley block of the auxiliary drive guiding part includes a counterweight clamping plate which is clamped on the control shaft brazing of the main shaft part. A pulley block mounting plate is fixedly connected to the counterweight clamping plate. Two lower pulley mounting seats are fixedly connected to the pulley block mounting plate. A lower pulley mounting shaft is installed between the two lower pulley mounting seats. A lower pulley is installed on the lower pulley mounting shaft. An upper pulley mounting seat is also fixedly connected to the counterweight clamping plate. An upper pulley mounting shaft is installed on the upper pulley mounting seat. An upper pulley is installed on the upper pulley mounting shaft. A pulley lifting plate is fixedly connected to the upper pulley mounting shaft, and the other end of the pulley lifting plate is clamped on the lower pulley mounting shaft.

[0008] A lower pulley rotating groove is formed on the counterweight clamping plate, and the lower pulley rotates within the lower pulley rotating groove.

[0009] The cross-section of the upper pulley mounting seat is in an inverted U shape. Long holes for the movement of the upper pulley mounting shaft are formed on both sides of the upper pulley mounting seat, and the upper pulley mounting shaft is arranged within the two long holes for the movement of the upper pulley mounting shaft.

[0010] The support seat of the support part includes a support part support plate. A support part mounting plate is fixedly connected to the support part support plate. A support part clamping ring is fixedly connected to the support part mounting plate. The support part clamping ring is in a "hook" shape, and the oxygen pipe passes through the support part clamping ring.

[0011] The fixed seat of the fixed part includes a fixed part fixing plate. A fixed base is fixedly connected to the fixed part fixing plate. Two shaft mounting seats are provided on the top of the fixed base. A fixed part rotating shaft is installed between the two shaft mounting seats. A fixed part upper cover is installed on the fixed part rotating shaft. The fixed part upper cover and the fixed base are fixedly connected by a locking quick buckle. The fixed base and the fixed part upper cover are in a "hinge" shape. Arc grooves corresponding to the oxygen pipe are formed on the opposite surfaces of the fixed base and the fixed part upper cover, and the oxygen pipe passes through the arc grooves.

[0012] The beneficial effects of the present utility model are as follows:

[0013] The automatic oxygen blowing device for the tapping of calcium carbide in a closed calcium carbide furnace provided by the present utility model has a simple designed and processed structure, and the raw materials are the most commonly used ordinary materials. The use and operation are simple and easy to understand. After the device is put into use, it not only ensures the safety factor of the operation, avoids the risk of personnel scalding caused by the splashing of calcium carbide at the furnace mouth during the operation, improves the operation efficiency, but also brings great economic benefits to the enterprise. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the automatic oxygen blowing device for the tapping of calcium carbide in a closed calcium carbide furnace of the present utility model;

[0015] Figure 2 is Figure 1 the partial enlarged view of A in

[0016] Figure 3yes Figure 1 A partial enlarged view of B in the middle;

[0017] Figure 4 yes Figure 1 A partial enlarged view of C in the middle.

[0018] In the figure, 1. the control shaft drill of the main shaft part, 2. the pulley block of the auxiliary transmission guide part, 211. the counterweight clamping plate, 212. the pulley block mounting plate, 213. the lower pulley mounting seat, 214. the lower pulley mounting shaft, 215. the lower pulley, 216. the upper pulley mounting seat, 217. the upper pulley mounting shaft, 218. the upper pulley, 219. the pulley lifting plate, 220 the lower pulley rotating groove, 221. the upper pulley mounting shaft moving long hole, 3. the supporting part supporting seat, 311. the supporting part supporting plate, 312. the supporting part mounting plate, 313. the supporting part clamping ring, 4. the fixing part fixing seat, 411. the fixing part fixing plate, 412. the fixing base, 413. the shaft mounting seat, 414. the fixing part rotating shaft, 415. the fixing part upper cover, 416. the locking quick buckle, 417. the arc groove, 5. the oxygen tube, 6. the robot grasping part. DETAILED DESCRIPTION

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] The utility model provides a closed calcium carbide furnace calcium carbide furnace automatic oxygen blowing device, such as Figure 1 As shown, it includes a spindle control shaft drill 1, one end of which is provided with a robot grasping portion 6, which is convenient for the robot to grasp the spindle control shaft drill 1, the spindle control shaft drill 1 is fixed with a support part support seat 3 and a fixed part fixed seat 4, the spindle control shaft drill 1 is clamped with an auxiliary transmission guide part pulley block 2, the auxiliary transmission guide part pulley block 2 is arranged between the support part support seat 3 and the fixed part fixed seat 4, and an oxygen tube 5 is passed through the auxiliary transmission guide part pulley block 2, the support part support seat 3 and the fixed part fixed seat 4. Figure 2As shown in the figure, the pulley group 2 of the auxiliary drive guiding part includes a counterweight clamping plate 211 which is clamped on the control shaft brazing 1 of the main shaft part, facilitating the prevention of uneven stress on the center of gravity during the grasping process of the robot, resulting in tilting. A pulley group mounting plate 212 is fixedly connected to the counterweight clamping plate 211. Two lower pulley mounting seats 213 are fixedly connected to the pulley group mounting plate 212. A lower pulley mounting shaft 214 is installed between the two lower pulley mounting seats 213. A lower pulley 215 is installed on the lower pulley mounting shaft 214. An upper pulley mounting seat 216 is also fixedly connected to the counterweight clamping plate 211. An upper pulley mounting shaft 217 is installed on the upper pulley mounting seat 216. An upper pulley 218 is installed on the upper pulley mounting shaft 217. A pulley lifting plate 219 is fixedly connected to the upper pulley mounting shaft 217, facilitating the vertical movement of the upper pulley 218, preventing the oxygen pipe 5 from being deformed by heat during use or being bent during handling, resulting in the oxygen pipe 5 not being able to pass through the pulley assembly during installation. The other end of the pulley lifting plate 219 is clamped on the lower pulley mounting shaft 214; a lower pulley rotation groove 220 is formed on the counterweight clamping plate 211, and the lower pulley 215 rotates within the lower pulley rotation groove 220; the cross-section of the upper pulley mounting seat 216 is in the shape of "冂", and long holes 221 for the movement of the upper pulley mounting shaft are formed on both sides of the upper pulley mounting seat 216, and the upper pulley mounting shaft 217 is arranged within the two long holes 221 for the movement of the upper pulley mounting shaft. As Figure 3 As shown in the figure, the support seat 3 of the support part includes a support part support plate 311 which plays a role in front-end support for the oxygen pipe 5. A support part mounting plate 312 is fixedly connected to the support part support plate 311. A support part clamping ring 313 is fixedly connected to the support part mounting plate 312. The support part clamping ring 313 is in the shape of a "hook", and the oxygen pipe 5 passes through the support part clamping ring 313. As Figure 4 As shown in the figure, the fixed seat 4 of the fixed part includes a fixed part fixing plate 411. A fixed base 412 is fixedly connected to the fixed part fixing plate 411. Two shaft mounting seats 413 are provided on the top of the fixed base 412. A fixed part rotating shaft 414 is installed between the two shaft mounting seats 413. A fixed part upper cover 415 is installed on the fixed part rotating shaft 414. The fixed part upper cover 415 and the fixed base 412 are fixedly connected by a locking quick buckle 416. The fixed base 412 and the fixed part upper cover 415 are in the shape of a "hinge". Arc grooves 417 corresponding to the oxygen pipe 5 are formed on the opposite surfaces of the fixed base 412 and the fixed part upper cover 415, and the oxygen pipe 5 passes through the arc grooves 417.

[0021] The utility model provides a closed type calcium carbide furnace calcium carbide furnace automatic oxygen blowing device, the working principle of which is as follows: the robot grabs the main shaft part control shaft drill 1 through the robot grabbing part 6 and retreats to the zero position, the on-site post personnel open the locking quick buckle 416 of the fixed part fixing seat 4, pass the oxygen tube 5 through, pass through the upper pulley 218 and the lower pulley 215 in turn, and then pass through the supporting part clamping ring 313, when the oxygen tube 5 is passed to the support part support seat 3 The length of about 4m, stop passing the oxygen tube 5, buckle the fixed part upper cover 415 of the fixed part fixing seat 4, and then lock the locking quick buckle 416, so that the oxygen tube cannot be moved along the X, Y, Move in the Z direction. After the oxygen tube 5 is fixed, connect the oxygen cylinder hose to the quick connector at the tail of the oxygen tube 5. At this time, all the installation work is completed. The DCS remote operator starts the robot to move forward along the furnace nozzle. When the front oxygen tube 5 is close to the furnace nozzle, turn on the oxygen switch. The robot continues to enter the furnace to start blowing oxygen. Use remote monitoring to control the oxygen blowing time. When the liquid calcium carbide in the furnace flows into the pot normally, the oxygen blowing is completed, the oxygen switch is turned off, the oxygen tube 5 is withdrawn, the quick connector is loosened, and the robot places the oxygen blowing device on the tool rack. The on-site personnel can use their spare time to adjust the length of the air pipe and use it again for the next oxygen blowing operation.

[0022] Example 1

[0023] The enclosed calcium carbide furnace automatic oxygen blowing device proposed in this embodiment is as follows: Figure 1 As shown, it includes a main shaft part control shaft drill 1, one end of the main shaft part control shaft drill 1 is provided with a robot grasping part 6, the main shaft part control shaft drill 1 is fixedly connected with a supporting seat 3 of a supporting part and a fixing seat 4 of a fixing part, the main shaft part control shaft drill 1 is clamped with an auxiliary transmission guide part pulley block 2, the auxiliary transmission guide part pulley block 2 is arranged between the supporting seat 3 of the supporting part and the fixing seat 4 of the fixing part, and an oxygen tube 5 is commonly penetrated through the auxiliary transmission guide part pulley block 2, the supporting seat 3 of the supporting part and the fixing seat 4 of the fixing part.

[0024] Example 2

[0025] The enclosed calcium carbide furnace automatic oxygen blowing device proposed in this embodiment is as follows: Figure 1 As shown, it includes a spindle control shaft drill 1, one end of which is provided with a robot grasping part 6, a support part support seat 3 and a fixed part fixed seat 4 are fixedly connected to the spindle control shaft drill 1, an auxiliary transmission guide part pulley block 2 is clamped on the spindle control shaft drill 1, and the auxiliary transmission guide part pulley block 2 is arranged between the support part support seat 3 and the fixed part fixed seat 4, and an oxygen tube 5 is passed through the auxiliary transmission guide part pulley block 2, the support part support seat 3 and the fixed part fixed seat 4. Figure 2As shown in the figure, the pulley block 2 of the auxiliary drive guiding part includes a counterweight clamping plate 211. The counterweight clamping plate 211 is clamped on the control shaft drill rod 1 of the main shaft part. A pulley block mounting plate 212 is fixedly connected to the counterweight clamping plate 211. Two lower pulley mounting seats 213 are fixedly connected to the pulley block mounting plate 212. A lower pulley mounting shaft 214 is installed between the two lower pulley mounting seats 213. A lower pulley 215 is installed on the lower pulley mounting shaft 214. An upper pulley mounting seat 216 is also fixedly connected to the counterweight clamping plate 211. An upper pulley mounting shaft 217 is installed on the upper pulley mounting seat 216. An upper pulley 218 is installed on the upper pulley mounting shaft 217. A pulley lifting plate 219 is fixedly connected to the upper pulley mounting shaft 217. The other end of the pulley lifting plate 219 is clamped on the lower pulley mounting shaft 214. A lower pulley rotation groove 220 is formed on the counterweight clamping plate 211. The lower pulley 215 rotates in the lower pulley rotation groove 220. The cross section of the upper pulley mounting seat 216 is in the shape of "冂". Long holes 221 for the movement of the upper pulley mounting shaft are formed on both sides of the upper pulley mounting seat 216. The upper pulley mounting shaft 217 is arranged in the two long holes 221 for the movement of the upper pulley mounting shaft.

[0026] Embodiment 3

[0027] The automatic oxygen blowing device for tapping calcium carbide from the enclosed calcium carbide furnace proposed in this embodiment, as Figure 1 shown, includes a control shaft drill rod 1 of the main shaft part. A robot grasping part 6 is provided at one end of the control shaft drill rod 1 of the main shaft part. A support part support seat 3 and a fixed part fixed seat 4 are fixedly connected to the control shaft drill rod 1 of the main shaft part. A pulley block 2 of the auxiliary drive guiding part is clamped on the control shaft drill rod 1 of the main shaft part. The pulley block 2 of the auxiliary drive guiding part is arranged between the support part support seat 3 and the fixed part fixed seat 4. An oxygen pipe 5 is commonly passed through the pulley block 2 of the auxiliary drive guiding part, the support part support seat 3 and the fixed part fixed seat 4. As Figure 2As shown in the figure, the pulley block 2 of the auxiliary drive guiding part includes a counterweight clamping plate 211. The counterweight clamping plate 211 is clamped on the control shaft brazing 1 of the main shaft part. A pulley block mounting plate 212 is fixedly connected to the counterweight clamping plate 211. Two lower pulley mounting seats 213 are fixedly connected to the pulley block mounting plate 212. A lower pulley mounting shaft 214 is installed between the two lower pulley mounting seats 213. A lower pulley 215 is installed on the lower pulley mounting shaft 214. An upper pulley mounting seat 216 is also fixedly connected to the counterweight clamping plate 211. An upper pulley mounting shaft 217 is installed on the upper pulley mounting seat 216. An upper pulley 218 is installed on the upper pulley mounting shaft 217. A pulley lifting plate 219 is fixedly connected to the upper pulley mounting shaft 217. The other end of the pulley lifting plate 219 is clamped on the lower pulley mounting shaft 214; a lower pulley rotation groove 220 is formed on the counterweight clamping plate 211, and the lower pulley 215 rotates in the lower pulley rotation groove 220; the cross section of the upper pulley mounting seat 216 is in the shape of "冂", and long holes 221 for the movement of the upper pulley mounting shaft are formed on both sides of the upper pulley mounting seat 216, and the upper pulley mounting shaft 217 is arranged in the two long holes 221 for the movement of the upper pulley mounting shaft. As Figure 3 As shown in the figure, the support seat 3 of the support part includes a support part support plate 311. A support part mounting plate 312 is fixedly connected to the support part support plate 311. A support part clamping ring 313 is fixedly connected to the support part mounting plate 312. The support part clamping ring 313 is in the shape of a "hook", and the oxygen pipe 5 passes through the support part clamping ring 313.

[0028] Example 4

[0029] The automatic oxygen-blowing device for tapping calcium carbide from a closed calcium carbide furnace proposed in this embodiment, as Figure 1 shown in the figure, includes a control shaft brazing 1 of the main shaft part. A robot grasping part 6 is provided at one end of the control shaft brazing 1 of the main shaft part. A support part support seat 3 and a fixed part fixed seat 4 are fixedly connected to the control shaft brazing 1 of the main shaft part. A pulley block 2 of the auxiliary drive guiding part is clamped on the control shaft brazing 1 of the main shaft part. The pulley block 2 of the auxiliary drive guiding part is arranged between the support part support seat 3 and the fixed part fixed seat 4. An oxygen pipe 5 passes through the pulley block 2 of the auxiliary drive guiding part, the support part support seat 3 and the fixed part fixed seat 4 together. As Figure 2As shown in the figure, the pulley block 2 of the auxiliary drive guiding part includes a counterweight clamping plate 211, which is clamped on the control shaft brazing 1 of the main shaft part. A pulley block mounting plate 212 is fixedly connected to the counterweight clamping plate 211. Two lower pulley mounting seats 213 are fixedly connected to the pulley block mounting plate 212. A lower pulley mounting shaft 214 is installed between the two lower pulley mounting seats 213. A lower pulley 215 is installed on the lower pulley mounting shaft 214. An upper pulley mounting seat 216 is also fixedly connected to the counterweight clamping plate 211. An upper pulley mounting shaft 217 is installed on the upper pulley mounting seat 216. An upper pulley 218 is installed on the upper pulley mounting shaft 217. A pulley lifting plate 219 is fixedly connected to the upper pulley mounting shaft 217, and the other end of the pulley lifting plate 219 is clamped on the lower pulley mounting shaft 214; a lower pulley rotation groove 220 is formed on the counterweight clamping plate 211, and the lower pulley 215 rotates in the lower pulley rotation groove 220; the cross section of the upper pulley mounting seat 216 is in an inverted U shape, and two upper pulley mounting shaft moving long holes 221 are formed on both sides of the upper pulley mounting seat 216, and the upper pulley mounting shaft 217 is arranged in the two upper pulley mounting shaft moving long holes 221. As Figure 3 As shown in the figure, the support seat 3 of the support part includes a support part support plate 311. A support part mounting plate 312 is fixedly connected to the support part support plate 311. A support part clamping ring 313 is fixedly connected to the support part mounting plate 312. The support part clamping ring 313 is in a "hook" shape, and the oxygen pipe 5 passes through the support part clamping ring 313. As Figure 4 As shown in the figure, the fixed seat 4 of the fixed part includes a fixed part fixing plate 411. A fixed base 412 is fixedly connected to the fixed part fixing plate 411. Two shaft mounting seats 413 are provided on the top of the fixed base 412. A fixed part rotating shaft 414 is installed between the two shaft mounting seats 413. A fixed part upper cover 415 is installed on the fixed part rotating shaft 414. The fixed part upper cover 415 and the fixed base 412 are fixedly connected by a locking quick buckle 416. The fixed base 412 and the fixed part upper cover 415 are in a "hinge" shape. An arc groove 417 corresponding to the oxygen pipe 5 is formed on the opposite surfaces of the fixed base 412 and the fixed part upper cover 415, and the oxygen pipe 5 passes through the arc groove 417.

Claims

1. Automatic oxygen blowing device for calcium carbide out of closed calcium carbide furnace, characterized in that: It includes a main shaft part control shaft brazing (1). One end of the main shaft part control shaft brazing (1) is provided with a robot grasping part (6). A support part support seat (3) and a fixing part fixing seat (4) are fixedly connected to the main shaft part control shaft brazing (1). An auxiliary transmission and guiding part pulley set (2) is clamped on the main shaft part control shaft brazing (1). The auxiliary transmission and guiding part pulley set (2) is arranged between the support part support seat (3) and the fixing part fixing seat (4). An oxygen pipe (5) is commonly passed through the auxiliary transmission and guiding part pulley set (2), the support part support seat (3) and the fixing part fixing seat (4).

2. The automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace according to claim 1 is characterized in that: The auxiliary transmission and guiding part pulley set (2) includes a counterweight clamping plate (211). The counterweight clamping plate (211) is clamped on the main shaft part control shaft brazing (1). A pulley set mounting plate (212) is fixedly connected to the counterweight clamping plate (211). Two lower pulley mounting seats (213) are fixedly connected to the pulley set mounting plate (212). A lower pulley mounting shaft (214) is installed between the two lower pulley mounting seats (213). A lower pulley (215) is installed on the lower pulley mounting shaft (214). An upper pulley mounting seat (216) is also fixedly connected to the counterweight clamping plate (211). An upper pulley mounting shaft (217) is installed on the upper pulley mounting seat (216). An upper pulley (218) is installed on the upper pulley mounting shaft (217). A pulley lifting plate (219) is fixedly connected to the upper pulley mounting shaft (217). The other end of the pulley lifting plate (219) is clamped on the lower pulley mounting shaft (214).

3. The automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace according to claim 2 is characterized in that: A lower pulley rotation groove (220) is formed on the counterweight clamping plate (211). The lower pulley (215) rotates in the lower pulley rotation groove (220).

4. The automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace according to claim 2 is characterized in that: The cross-section of the upper pulley mounting seat (216) is in the shape of "冂". Long holes (221) for the movement of the upper pulley mounting shaft are formed on both sides of the upper pulley mounting seat (216). The upper pulley mounting shaft (217) is arranged in the two long holes (221) for the movement of the upper pulley mounting shaft.

5. The automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace according to claim 1 is characterized in that: The support part support seat (3) includes a support part support plate (311). A support part mounting plate (312) is fixedly connected to the support part support plate (311). A support part clamping ring (313) is fixedly connected to the support part mounting plate (312). The support part clamping ring (313) is in the shape of a "hook". The oxygen pipe (5) passes through the support part clamping ring (313).

6. The automatic oxygen blowing device for calcium carbide out of a closed calcium carbide furnace according to claim 1 is characterized in that: The fixed part fixing seat (4) comprises a fixed part fixing plate (411), a fixed base (412) is fixedly connected to the fixed part fixing plate (411), two shaft mounting seats (413) are arranged on the top of the fixed base (412), a fixed part rotating shaft (414) is installed between the two shaft mounting seats (413), a fixed part upper cover (415) is installed on the fixed part rotating shaft (414), the fixed part upper cover (415) is fixedly connected to the fixed base (412) by a locking quick buckle (416), the fixed base (412) and the fixed part upper cover (415) are in a "hinge" shape, and a circular arc groove (417) corresponding to the oxygen tube (5) is provided on the opposite surface of the fixed base (412) and the fixed part upper cover (415), and the oxygen tube (5) is inserted into the circular arc groove (417).

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