A ladle precise pouring sand drainage device

Abstract

The present application provides a kind of ladle precision pouring drainage sand device, relate to steel metallurgy technical field, the ladle precision pouring drainage sand device, including feeding piece, the feeding piece includes ration tank, the ration tank is opened with feeding opening, the feeding opening is used to add drainage sand in the ration tank, when using, ration tank is filled with drainage sand, ration tank is required to ration drainage sand and take material, control outer tube bottom contact ladle and outer tube bottom is communicated with nozzle, then control drive mechanism drives inner tube to move down, the discharge port on the inner tube enters the inside of ration tank, to the part of discharge port and ration tank communication, another part is communicated with outer tube, so that the drainage sand in ration tank can completely fall into nozzle through inner tube, effectively improve the accuracy of drainage sand guiding out material position, at the same time, also make the required ration of drainage sand in ration tank completely pour into nozzle position, realize the ration of drainage sand delivery amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel metallurgy, and particularly relates to a precise sand pouring device for a ladle. BACKGROUND

[0002] In order to realize automatic pouring when the ladle is connected to the continuous casting machine, the sand in the nozzle is filled with the sand before tapping, and the quality of the sand in the nozzle directly affects the natural flow of the molten steel in the ladle, and determines the normal connection of the molten steel in the continuous casting machine. If the molten steel in the ladle cannot be normally guided by the sand in the nozzle, the molten steel must be treated by burning oxygen through the nozzle or pouring the molten steel into a ladle, which causes the molten steel in the continuous casting machine to be oxidized twice during the oxygen burning process or the molten steel to be poured into a ladle, resulting in the non-planned stop of the pouring.

[0003] A precise sand pouring device for a ladle is disclosed in Chinese Patent No. CN206343619U, which comprises a base arranged on a sand pouring platform, one end of a rotating arm is hingedly connected to a support, the other end of the rotating arm is provided with a fixed pulley and a fixed rope plate, an upper surface of the rotating arm is provided with a track, a sand pouring device is arranged on the track in a matched manner, the sand pouring device comprises a hopper, one side of the hopper is clamped to the rotating arm and is rollingly connected to the track, a movable pulley is arranged on one side of the upper end of the hopper, a steel wire rope on a driving roller is connected to the fixed rope plate through the fixed pulley and the movable pulley, a sand guide pipe is arranged at the bottom of the hopper and is connected to the hopper in a communicating manner, a through hole is arranged on the sand pouring platform corresponding to the sand guide pipe, the sand pouring platform on one side of the hopper is provided with a sand guiding material bin, a flow pipe is arranged on the sand guiding material bin and is connected to the hopper, and a valve is arranged on the flow pipe. The utility model has the advantages of reasonable structure and convenient use.

[0004] However, the above technical solution still has the following defects: the sand pouring device is lowered by controlling the driving roller to act and by the steel wire rope, the sand guide pipe is lowered by the lowering of the sand pouring device, the deformation of the steel wire rope in use causes the depth of the sand guide pipe to be inaccurate, the sand guiding discharge position is inaccurate, and the amount of the sand guiding pouring cannot be quantitatively determined. SUMMARY

[0005] The present application aims to provide a precise sand pouring device for a ladle, and aims to solve the problem that the deformation of the steel wire rope in the prior art causes the depth of the sand guide pipe to be inaccurate, the sand guiding position is inaccurate, and the amount of the sand guiding pouring cannot be quantitatively determined.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: the precise sand pouring device for a ladle comprises:

[0007] Sand filling platform

[0008] The feeding piece comprises a dosing tank, a feeding opening is formed on the dosing tank, the feeding opening is used for adding drainage sand into the dosing tank, a bottom of the dosing tank is communicated with an outer pipe, and a diameter of the bottom of the outer pipe is greater than that of a top of a water gap.

[0009] An inner pipe vertically extends into the outer pipe from the top of the dosing tank and can be sealedly slid up and down along an inner wall of the outer pipe, and a discharging opening is formed on an outer circular sidewall of the inner pipe.

[0010] A driving mechanism is used for driving the inner pipe to move up and down, so that the discharging opening of the inner pipe enters or leaves the dosing tank, when the discharging opening of the inner pipe enters the dosing tank, a part of the discharging opening is communicated with the dosing tank and another part is communicated with the outer pipe, so that the drainage sand in the dosing tank can completely fall into the water gap of the ladle through the inner pipe, and when the discharging opening of the inner pipe leaves the dosing tank, the drainage sand can be kept in the dosing tank.

[0011] Further technical solutions of the present application are that a connecting structure is arranged on the inner pipe and the feeding piece, and the feeding piece can be hung on the inner pipe through the connecting structure.

[0012] Further technical solutions of the present application are that the connecting structure comprises a first connecting rod hinged on the feeding piece and a second connecting rod hinged on the inner pipe, and the second connecting rod is hinged with the first connecting rod.

[0013] Further technical solutions of the present application are that the connecting structure comprises a boss arranged on the feeding piece and a third connecting rod arranged on the inner pipe, and a hook is arranged on the third connecting rod and located directly below the boss.

[0014] Further technical solutions of the present application are that the connecting structure comprises a fixing plate arranged on the inner pipe, and an elastic piece is arranged between the fixing plate and the dosing tank.

[0015] Further technical solutions of the present application are that the connecting structure comprises at least one flexible connecting piece, and two ends of each flexible connecting piece are connected to the inner pipe and the feeding piece respectively.

[0016] Further technical solutions of the present application are that rotating driving structures are arranged on the inner pipe and the dosing tank, and when the inner pipe moves downward relative to the dosing tank, the rotating driving structures can drive the dosing tank to rotate relative to the inner pipe.

[0017] The rotating driving structures comprise a helical groove and a helical strip matched with each other, and the helical groove and the helical strip are arranged on the dosing tank and the inner pipe respectively.

[0018] The further technical scheme of the present application is further comprising a feeding mechanism for adding drainage sand to the feeding opening, the feeding mechanism comprising a tank and a pipe, the tank is used for storing drainage sand, a discharge nozzle is arranged on the tank for discharging the drainage sand in the tank, the inner side of the discharge nozzle is a horn shape with small upper side and large lower side, a valve is arranged on the tank for opening and closing the discharge nozzle, the pipe is fixedly arranged on the quantitative tank and communicates with the feeding opening, the pipe can move along the inner side slope of the discharge nozzle to communicate with the discharge nozzle when moving upwards.

[0019] The further technical scheme of the present application is that the quantitative tank comprises a tank body and a vent cap which is detachably connected with the tank body, and the vent cap is provided with a vent hole.

[0020] The beneficial effects of the present application are as follows: when in use, the crown block hoists the ladle to the sand filling position, the sand filling platform is opened to the sand filling position, the quantitative tank is filled with drainage sand, the quantitative tank takes the required drainage sand quantitatively, the outer pipe bottom contacts the ladle and the outer pipe bottom communicates with the nozzle, then the driving mechanism is controlled to drive the inner pipe to move downwards, the discharge port on the inner pipe enters the inside of the quantitative tank, a part of the discharge port communicates with the quantitative tank and the other part communicates with the outer pipe, so that the drainage sand in the quantitative tank can completely fall into the nozzle through the inner pipe, the accuracy of the drainage sand guiding and discharging position is effectively improved, and the required quantitative drainage sand in the quantitative tank is completely filled into the nozzle position, so that the quantitative drainage sand feeding amount is realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of a specific embodiment of the present application.

[0022] Figure 2 is a sectional view of a specific embodiment of the present application.

[0023] Figure 3 is a structural schematic view of a specific embodiment of the present application. Figure 2 is an enlarged structural schematic view of A in FIG.

[0024] Figure 4 is a sectional view of a ladle and a nozzle of a specific embodiment of the present application.

[0025] Figure 5 is a structural schematic view of a specific embodiment of the present application. Figure 4 is an enlarged structural schematic view of B in FIG.

[0026] Figure 6 is a structural schematic view of a first embodiment of a connecting structure of the present application, showing the state of the inner pipe hanging the feeding member and the state of the inner pipe moving downwards relative to the feeding member.

[0027] Figure 7 is a structural schematic view of a second embodiment of a connecting structure of the present application, showing the state of the inner pipe hanging the feeding member and the state of the inner pipe moving downwards relative to the feeding member.

[0028] Figure 8 is a structural schematic diagram of a third embodiment of the connecting structure of the present application; it shows the state of the inner tube hanging the feeding member and the state of the inner tube moving downward relative to the feeding member.

[0029] Figure 9 is a structural schematic diagram of a fourth embodiment of the connecting structure of the present application; it shows the state of the inner tube hanging the feeding member and the state of the inner tube moving downward relative to the feeding member.

[0030] Figure 10 is a structural schematic diagram of the rotary driving structure of the present application.

[0031] In the figure: 1 - sand pouring platform, 2 - feeding member, 201 - quantitative tank, 2011 - tank body, 2012 - vent cap, 2013 - vent hole, 202 - feeding opening, 203 - outer tube, 3 - inner tube, 301 - discharging opening, 4 - connecting structure, 401 - first connecting rod, 402 - second connecting rod, 403 - boss, 404 - third connecting rod, 405 - hook, 406 - fixed plate, 407 - elastic member, 408 - flexible connecting member, 5 - limiting member, 6 - driving mechanism, 601 - guide strip, 602 - motor, 603 - connecting strip, 604 - screw rod, 7 - rotary driving structure, 701 - helical groove, 702 - helical strip, 8 - feeding mechanism, 801 - material box, 802 - material pipe, 803 - discharging nozzle, 804 - valve, 9 - rubber ring, 10 - ladle, 1001 - water gap. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the protection scope of the present disclosure.

[0033] As shown in Figures 1-6 , an embodiment of the present application is a ladle precise sand pouring and drainage device, which comprises:

[0034] The sand pouring platform 1 can support the ladle precise sand pouring and drainage device and move back and forth between the sand pouring position and the non-sand pouring position.

[0035] The feeding member 2 includes a dosing tank 201 in this embodiment. The inner cavity of the dosing tank 201 can accommodate an amount of drainage sand equal to the amount of drainage sand required by the water gap 1001. A feeding opening 202 is formed on the dosing tank 201 for adding drainage sand into the dosing tank 201. The dosing tank 201 includes a tank body 2011 and a breather cover 2012 detachably connected to the tank body 2011. The breather cover 2012 is provided with a breather hole 2013. The size of the breather hole 2013 is smaller than the size of the drainage sand, which can prevent the drainage sand from leaking out of the breather hole 2013. The breather hole 2013 can communicate the gas inside the dosing tank 201 with the gas outside the dosing tank 201, so as to make the air pressure inside the dosing tank 201 consistent with the air pressure outside the dosing tank 201. If the breather hole 2013 is blocked, the breather cover 2012 can be detached from the tank body 2011 for replacement. The bottom of the dosing tank 201 is provided with an outer pipe 203. The diameter of the bottom of the outer pipe 203 is larger than the diameter of the water gap 1001, so that the lower end surface of the outer pipe 203 can contact the top of the water gap 1001 of the ladle. In this embodiment, the outer pipe 203 is in the shape of a hollow cylinder.

[0036] Reference Figure 2 and Figure 3 As an embodiment of detachable connection of the tank body 2011 and the breather cover 2012, the breather cover 2012 is provided with a threaded segment threadedly connected to the threaded hole on the tank body 2011. The breather cover 2012 can be rotated to be detached from the threaded hole on the tank body 2011.

[0037] The inner pipe 3 can be sealingly slid up and down along the inner wall of the outer pipe 203. The inner pipe 3 vertically extends downward from the top of the dosing tank 201, so that the inner pipe 3 can move up and down relative to the feeding member 2. In this embodiment, the inner wall of the outer pipe 203 is provided with an annular rubber ring 9, which sealingly abuts against the outer surface of the inner pipe 3, so as to improve the sealing effect between the outer pipe 203 and the inner pipe 3. The outer cylindrical sidewall of the inner pipe 3 is provided with a discharging opening 301. The drainage sand can enter the inner pipe 3 through the discharging opening 301 and be guided to move downward along the outer pipe 203. When the discharging opening 301 on the inner pipe 3 is located outside the dosing tank 201 and does not communicate with the inner cavity of the dosing tank 201, the drainage sand in the dosing tank 201 cannot enter the inner pipe 3. When the inner pipe 3 moves downward relative to the outer pipe 203 until the discharging opening 301 enters the inside of the dosing tank 201 and a part of the discharging opening 301 is located inside the outer pipe 203 and another part of the discharging opening 301 is located inside the dosing tank 201 (see Figure 5 ), the drainage sand in the dosing tank 201 can smoothly enter the water gap 1001 of the ladle through the inner pipe 3;

[0038] Reference Figure 1 and Figure 6For the first embodiment of the connecting structure, the inner tube 3 and the feeding member 2 are connected together through the connecting structure 4, and the feeding member 2 can be hung on the inner tube 3 through the connecting structure 4, in this embodiment, the connecting structure 4 comprises a first connecting rod 401 hinged on the feeding member 2 and a second connecting rod 402 hinged on the inner tube 3, the second connecting rod 402 is hinged with the first connecting rod 401, in this embodiment, the feeding member 2 is hinged with the first connecting rod 401 through a hinge, the inner tube 3 is hinged with the second connecting rod 402 through a hinge, the second connecting rod 402 is hinged with the first connecting rod 401 through a hinge, and the feeding member 2 can be hung and lifted up through the first connecting rod 401 and the second connecting rod 402 when the inner tube 3 moves upward; when the inner tube 3 moves downward relative to the feeding member 2, the first connecting rod 401 and the feeding member 2, the second connecting rod 402 and the inner tube 3, and the first connecting rod 401 and the second connecting rod 401 can rotate;

[0039] The limiting member 5 is fixedly arranged on the inner tube 3 and located above the dosing tank 201, and can limit the position of the inner tube 3 moving downward along the feeding member 2, the shape of the limiting member 5 is plate-shaped, strip-shaped or block-shaped;

[0040] The driving mechanism 6 is used to drive the inner tube 3 to move up and down, in this embodiment, the driving mechanism 6 comprises a guide strip 601 fixedly arranged on the sand filling platform 1 and a motor 602, the guide strip 601 is single-dof slidingly connected with a connecting strip 603 connected with the inner tube 3, the output end of the motor 602 is fixedly connected with a screw rod 604 threadedly connected with the connecting strip 603, and in other embodiments, the driving mechanism 6 is a pneumatic cylinder, a hydraulic cylinder or an electric telescopic rod;

[0041] The feeding mechanism 8 is used for adding drainage sand to the feeding port 202, and can realize the function of adding drainage sand to the quantitative tank 201. In this embodiment, the feeding mechanism 8 comprises a tank 801 and a pipe 802. The tank 801 is used for storing drainage sand. An outlet nozzle 803 for discharging the drainage sand in the tank 801 is arranged on the tank 801. The inner side of the outlet nozzle 803 is in a shape of a horn with a small upper part and a large lower part. A valve 804 for opening and closing the outlet nozzle 803 is arranged on the tank 801. The pipe 802 is fixedly arranged on the quantitative tank 201 and communicates with the feeding port 202. The pipe 802 can be used for adding drainage sand to the feeding port 202. The pipe 802 can be moved along the inner side of the outlet nozzle 803 to communicate with the outlet nozzle 803. In use, the quantitative tank 201 is moved upward to drive the pipe 802 to move upward synchronously. The pipe 802 is first contacted with the inner side of the outlet nozzle 803. Since the inner side of the outlet nozzle 803 is in a shape of a horn with a small upper part and a large lower part, the pipe 802 can be guided along the inner side of the outlet nozzle 803 to communicate with the outlet nozzle 803. Then, the valve 804 is opened to control the drainage sand in the tank 801 to be discharged from the outlet nozzle 803 and injected into the quantitative tank 201 through the pipe 802 and the feeding port 202 until the quantitative tank 201 is filled with the drainage sand. Then, the valve 804 is closed.

[0042] In this specific embodiment, the quantitative tank 201 is filled with the drainage sand. The quantitative tank 201 is used for quantitatively taking the required drainage sand. The crown block hoists the ladle 10 to a sand filling position. The sand filling platform 1 is opened to the sand filling position. Then, the driving mechanism 6 is controlled to drive the inner pipe 3 to move downward. The inner pipe 3 is connected to the feeding member 2 through the connecting structure 4, so that the feeding member 2 is driven to move downward until the bottom of the outer pipe 203 is located on the ladle 10 at the edge of the corresponding nozzle 1001. Then, the inner pipe 3 is continuously controlled to move downward. At this time, the feeding member 2 is kept stationary, and the inner pipe 3 is no longer suspended to the feeding member 2. During the movement of the inner pipe 3, the discharge port 301 is also moved downward to enter the quantitative tank 201 until the limiting member 5 is in contact with the quantitative tank 201 to stop. At this time, the discharge port 301 is also moved to the bottom of the quantitative tank 201. The drainage sand in the entire quantitative tank 201 is introduced into the inner pipe 3 through the discharge port 301. The drainage sand is introduced into the nozzle 1001 through the inner pipe 3 and the outer pipe 203. Therefore, the accuracy of the drainage sand guiding and discharging position is improved. The drainage sand is prevented from floating and splashing to the outer area of the outer pipe 203 when the drainage sand falls, so that the waste of the drainage sand is avoided. Meanwhile, the quantitative drainage sand in the quantitative tank 201 is completely introduced into the nozzle 1001, so that the quantitative formulation of the drainage sand can be realized.

[0043] As Figure 7As shown, a second embodiment of the connecting structure 4 is illustrated. The connecting structure 4 includes a boss 403 welded and fixed to the feeding component 2 and a third connecting rod 404 disposed on the inner tube 3. A hook 405 is disposed on the third connecting rod 404 located directly below the boss 403. When the inner tube 3 moves upward, the hook 405 can be moved upward by the third connecting rod 404. The upward movement of the hook 405 drives the entire feeding component 2 to move upward by hooking the boss 403. When the inner tube 3 moves downward relative to the feeding component 2, the hook 405 can move away from the boss 403. Compared with the first embodiment of the connecting structure 4, this embodiment has a simple structure and is easy to assemble.

[0044] like Figure 8 As shown, a third embodiment of the connecting structure 4 is illustrated. The connecting structure 4 includes a fixing plate 406 disposed on the inner tube 3. An elastic element 407 is disposed between the fixing plate 406 and the metering cylinder 201. When the inner tube 3 moves upward, it can drive the entire feeding component 2 to move upward through the elastic element 407. When the inner tube 3 moves downward relative to the feeding component 2, it can compress the elastic element 407. When the lower end of the outer tube 203 moves downward and contacts the ladle nozzle 1001, the inner tube 3 will continue to move downward relative to the outer tube 203 by a certain distance and extend into the interior of the nozzle 1001. At the same time, the guiding sand in the metering tank 201 can smoothly enter the ladle nozzle 1001 through the discharge port 301 of the inner tube 3.

[0045] like Figure 9 As shown, a fourth embodiment of the connecting structure 4 is illustrated. The connecting structure 4 includes at least one flexible connector 408. The two ends of each flexible connector 408 are respectively connected to the inner tube 3 and the feeding component 2. The flexible connector 408 is a belt, rope, steel cable or chain. When the inner tube 3 moves upward, it can drive the entire feeding component 2 to move upward through the flexible connector 408. When the inner tube 3 moves downward relative to the feeding component 2, the flexible connector 408 no longer drives.

[0046] like Figure 10 As shown, in some exemplary embodiments, a rotation drive structure 7 is provided on the inner tube 3 and the metering tank 201. When the inner tube 3 moves downward relative to the metering tank 201, the rotation drive structure 7 can drive the metering tank 201 to rotate relative to the inner tube 3. The rotation of the metering tank 201 relative to the inner tube 3 can guide the guide sand into the feeding port 202, avoiding the guide sand remaining in the dead corner between the metering tank 201 and the inner tube 3. In this embodiment, the rotation drive structure 7 includes a spiral groove 701 and a spiral strip 702 that cooperate with each other. The spiral groove 701 and the spiral strip 702 are respectively provided on the metering tank 201 and the inner tube 3. The inner tube 3 is rotatably connected to the movable end of the drive mechanism 6 through a bearing. When the inner tube 3 moves downward relative to the metering tank 201, the cooperation of the spiral groove 701 and the spiral strip 702 forces the inner tube 3 to rotate relative to the metering tank 201.

Claims

1. A ladle precise filling sand guiding device, characterized in that, The application relates to a sand feeding device for a ladle, which comprises the following components: a sand pouring platform (1); a feeding component (2) comprising a metering tank (201) provided with a feeding opening (202) for adding drainage sand into the metering tank (201), and an outer pipe (203) communicated with the bottom of the metering tank (201) and having a diameter larger than that of the top of a water gap (1001); an inner pipe (3) vertically extending into the outer pipe (203) from the top of the metering tank (201) and being capable of sealingly sliding up and down along the inner wall of the outer pipe (203), and a discharging opening (301) being formed in the outer circular sidewall of the inner pipe (3); a driving mechanism (6) for driving the inner pipe (3) to move up and down so that the discharging opening (301) of the inner pipe (3) enters or leaves the metering tank (201), when the discharging opening (301) of the inner pipe (3) enters the metering tank (201), a part of the discharging opening (301) is communicated with the metering tank (201) and the other part is communicated with the outer pipe (203), so that the drainage sand in the metering tank (201) can completely fall into the water gap (1001) of the ladle (10) through the inner pipe (3), and when the discharging opening (301) of the inner pipe (3) leaves the metering tank (201), the drainage sand can be kept in the metering tank (201).

2. The precise ladle filling and diversion sand device of claim 1, wherein, The application further comprises a connecting structure (4) arranged on the inner pipe (3) and the feeding component (2), and the feeding component (2) can be hung on the inner pipe (3) through the connecting structure (4).

3. The precise ladle filling and diversion sand device of claim 2, wherein, The connecting structure (4) comprises a first connecting rod (401) hinged on the feeding component (2) and a second connecting rod (402) hinged on the inner pipe (3), and the second connecting rod (402) is hinged with the first connecting rod (401).

4. The precise ladle filling and diversion sand device of claim 2, wherein, The connecting structure (4) comprises a boss (403) arranged on the feeding component (2) and a third connecting rod (404) arranged on the inner pipe (3), and the third connecting rod (404) is provided with a hook (405) located directly below the boss (403).

5. The precise ladle filling and diversion sand device of claim 2, wherein, The connecting structure (4) comprises a fixing plate (406) arranged on the inner pipe (3), and an elastic member (407) is arranged between the fixing plate (406) and the metering tank (201).

6. The precise ladle filling and diversion sand device of claim 2, wherein, The connecting structure (4) comprises at least one flexible connecting member (408), and two ends of each flexible connecting member (408) are connected to the inner pipe (3) and the feeding component (2) respectively.

7. The precise ladle shroud filling and sand directing device of claim 1, wherein, The inner pipe (3) and the metering tank (201) are provided with a rotating driving structure (7), and when the inner pipe (3) moves downward relative to the metering tank (201), the rotating driving structure (7) can drive the metering tank (201) to rotate relative to the inner pipe (3).

8. The precise ladle filling and diversion sand device of claim 7, wherein, The rotating driving structure (7) comprises a helical groove (701) and a helical strip (702) matched with each other, and the helical groove (701) and the helical strip (702) are arranged on the metering tank (201) and the inner pipe (3) respectively.

9. The precise ladle shroud filling and sand directing device of claim 1, wherein, The feeding mechanism (8) for adding drainage sand to the feeding opening (202) comprises a tank (801) and a pipe (802), the tank (801) is used for storing drainage sand, a discharge nozzle (803) for discharging the drainage sand in the tank (801) is arranged on the tank (801), the inner side of the discharge nozzle (803) is in a horn shape with a small upper side and a large lower side, a valve (804) for opening and closing the discharge nozzle (803) is arranged on the tank (801), the pipe (802) is fixedly arranged on the metering tank (201) and communicates with the feeding opening (202), and the pipe (802) can move along the inner side slope of the discharge nozzle (803) to communicate with the discharge nozzle (803).

10. The precise ladle shroud sand pouring device according to any one of claims 1-9, characterized in that, The metering tank (201) comprises a tank body (2011) and a vent cover (2012) which is detachably connected with the tank body (2011), and a vent hole (2013) is arranged on the vent cover (2012).

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