Device for reducing endpoint carbon-oxygen deposition of converter

Abstract

The utility model relates to the technical field of converters, in particular to a device for reducing end point carbon and oxygen deposits of a converter, which comprises a bottom cover, a blowing cover, a blowing port, a filtering mechanism, an external thread, a supporting seat, a supporting shell and an air inlet mechanism, anti-skid grains are arranged on the side wall of the bottom cover, and the blowing cover is fixedly arranged on the bottom cover. The bottom cover is provided with a plurality of mounting ports on the peripheral sides of the blowing ports, the inner top wall of the blowing cover is provided with a plurality of blowing ports, the filtering mechanism is arranged in the blowing ports and used for preventing impurities from entering the converter and impurities in the converter from entering the blowing cover, and the outer wall of the blowing cover is provided with external threads. The supporting seat is rotatably arranged on the inner bottom wall of the blowing cover, a supporting groove is formed in the side wall of the side, close to the bottom cover, of the supporting seat, the supporting shell is fixedly arranged on the supporting seat, and the air inlet mechanism is arranged on the bottom cover and used for supplying air into the blowing cover. The problem that the steelmaking effect is affected due to the fact that air is blown into the converter unevenly in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of converters, in particular to a device for reducing terminal carbon and oxygen accumulation in a converter. Background Art

[0002] Steelmaking refers to controlling the carbon content (generally less than 2%), eliminating harmful elements such as P, S, O, N, retaining or increasing beneficial elements such as Si, Mn, Ni, Cr and adjusting the ratio between elements to obtain the best performance. Pig iron for steelmaking is placed in a steelmaking furnace and smelted according to a certain process to obtain steel. Steel products include steel ingots, continuous casting billets and various steel castings directly cast. The steel usually refers to steel rolled into various steel materials. Steel belongs to ferrous metals, but steel is not completely equal to ferrous metals.

[0003] Among them, the converter is a kind of steelmaking furnace, generally refers to a tiltable cylindrical oxygen-blowing steelmaking container. The furnace body is cylindrical and mounted on a horizontal axis frame. It can rotate and is also used to smelt copper. The existing converter bottom blowing mechanism mostly adopts top and bottom double blowing converter. After blowing oxygen into the furnace, a second blowing is required. The traditional blowing method adopts a double-head bottom blowing structure. This blowing method blows unevenly and cannot guarantee the connection quality of the device. At the same time, impurities in the converter are easy to fall into the bottom blowing hole and cause blockage. Therefore, the composition in the furnace cannot be more uniform, the ferrous oxide content is high, and the steelmaking quality of the device is poor. Utility Model Content

[0004] The utility model provides a device for reducing the final carbon and oxygen accumulation of a converter, which solves the problem in the related technology that uneven air blowing into the converter affects the steelmaking effect.

[0005] The technical solution of the utility model is as follows: a device for reducing the final carbon and oxygen accumulation of a converter, comprising a bottom cover, a blowing hood, a blowing port, a filtering mechanism, an external thread, a supporting seat, a supporting shell and an air intake mechanism;

[0006] The blowing hood is fixedly arranged on the bottom cover;

[0007] A plurality of blowing ports are provided on the inner top wall of the blowing hood;

[0008] The filtering mechanism is arranged in the air blowing port to prevent impurities from entering the converter and prevent impurities in the converter from entering the air blowing hood;

[0009] The outer wall of the blowing hood is provided with an external thread;

[0010] The support seat is rotatably arranged on the inner bottom wall of the blowing hood, and a support groove is provided on the side wall of the support seat close to the bottom cover;

[0011] The support shell is fixedly arranged on the support seat;

[0012] The air intake mechanism is arranged on the bottom cover and is used for supplying air into the air blowing hood.

[0013] Preferably, the air intake mechanism comprises:

[0014] A first air inlet pipe, a plurality of which are connected and rotatably arranged on the support shell, and one end of the first air inlet pipe away from the support shell is sealed;

[0015] An air intake nozzle, wherein each of the first air intake pipes is connected and provided with a plurality of the air intake nozzles;

[0016] a second air inlet pipe, the second air inlet pipe being rotatably disposed on the bottom cover and extending into the supporting shell;

[0017] a first air supply pipe, the first air supply pipe being arranged on the bottom cover and being in communication with the second air inlet pipe;

[0018] a second air supply pipe and a third air supply pipe, wherein the second air supply pipe and the third air supply pipe are connected and arranged on the first air supply pipe;

[0019] Wherein, a second control valve and a third control valve are arranged in the second air supply pipe and the third air supply pipe;

[0020] A rotating mechanism, the rotating mechanism is arranged on the bottom cover and is used to control the support seat to rotate;

[0021] A swing mechanism is arranged in the supporting groove and is used to control the first air intake pipe to swing.

[0022] Furthermore, the rotating mechanism comprises:

[0023] A first annular rack, wherein the first annular rack is fixedly disposed on the side wall of the support seat;

[0024] A first gear, the first gear is rotatably disposed on the bottom cover, and the first gear is meshed with the first annular rack;

[0025] A first motor is fixedly disposed on the bottom cover, and an output end of the first motor is meshed with the first gear.

[0026] Furthermore, the swing mechanism comprises:

[0027] A first bevel gear, a plurality of the first bevel gears are rotatably arranged on the inner wall of the support housing, and the first bevel gears are fixedly connected to the first air intake pipe;

[0028] A first air inlet, wherein the first air inlet is provided on the first bevel gear and is connected to the first air inlet pipe;

[0029] A second bevel gear, wherein the second bevel gear is fixedly disposed on the first intake pipe and meshes with the first bevel gear;

[0030] a second air inlet, the second air inlet being disposed on the second bevel gear and being communicated with the second air inlet pipe;

[0031] A reciprocating rotating mechanism is arranged in the supporting groove and is used for controlling the second air intake pipe to swing.

[0032] Furthermore, the reciprocating rotation mechanism includes:

[0033] A second gear, wherein the second gear is fixedly arranged on the side wall of the second air intake pipe;

[0034] A driving frame, wherein the driving frame is slidably disposed on the bottom cover;

[0035] A second rack, the second rack is fixedly disposed on the side wall of the driving frame, and the second rack is meshed with the second gear;

[0036] A reciprocating mechanism is arranged in the supporting groove and is used for controlling the driving frame to move reciprocatingly.

[0037] On the basis of the above scheme, the reciprocating mechanism comprises:

[0038] A driving disk, the driving disk being rotatably disposed at the bottom of the supporting groove;

[0039] A rotating shaft, on which the eccentric position of the driving disc is rotatably provided;

[0040] A driving rod, the driving rod being hingedly disposed between the rotating shaft and the inner wall of the driving frame;

[0041] The second motor is fixedly arranged on the support seat, and the output end of the second motor is fixedly connected to the driving disk.

[0042] On the basis of the above scheme, the filtering mechanism comprises:

[0043] Filter rings, a plurality of filter rings are provided on the air blowing hood, and the filter rings correspond to the air blowing ports one by one;

[0044] A filter screen, wherein the filter screen is arranged in the filter ring;

[0045] The mounting mechanism is arranged between the filter ring and the air blowing hood and is used for mounting and dismounting the filter ring.

[0046] On the basis of the above scheme, the installation mechanism includes:

[0047] Internal thread, the air port is fixedly provided with an internal thread;

[0048] An externally threaded pipe, wherein the externally threaded pipe is fixedly arranged on the filter ring;

[0049] Wherein, the external threaded tube extends into the blowing port through threaded fitting.

[0050] Based on the above solution, the bottom cover is provided with a plurality of installation openings around the air outlet.

[0051] Based on the above solution, anti-slip grooves are provided on the side walls of the bottom cover.

[0052] The working principle and beneficial effects of the utility model are:

[0053] 1. In the utility model, by setting the air intake mechanism, the second air supply pipe can be connected to the oxygen storage box, and the third air supply pipe can be connected to the argon storage box, so that oxygen or argon can be blown into the air blowing hood by opening and closing the second control valve and the third control valve, so as to facilitate the supply of air into the converter through the air blowing port;

[0054] 2. In the present invention, through the setting of the rotating mechanism, the operation of the first motor can control the first gear to rotate, and at the same time, the meshing of the first gear and the first annular rack drives the support seat to rotate, thereby making the air intake nozzle move around the support seat, so as to facilitate uniform air supply to the converter through the air blowing port;

[0055] 3. In the utility model, by setting the swing mechanism, the reciprocating mechanism can control the second air inlet pipe and the second bevel gear to reciprocate, and then the air inlet nozzle is driven to swing around the first air inlet pipe through the meshing of the first bevel gear and the second bevel gear, thereby further improving the uniformity of the air supply from the air port to the converter;

[0056] 4. In the utility model, by setting the filtering mechanism, it is convenient to protect the air outlet through the filter net, thereby preventing impurities in the converter from entering the air blowing hood and preventing impurities in the external environment from entering the converter;

[0057] 5. In the utility model, through the arrangement of the bottom cover, the blowing hood, the blowing port, the filtering mechanism, the external thread, the supporting seat, the supporting shell and the air intake mechanism, it is convenient to realize uniform air supply into the blowing hood through the movement and swing of the air intake nozzle, and then realize uniform air supply into the converter through the blowing port, thereby solving the problem of uneven air blowing into the converter affecting the steelmaking effect in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0059] Figure 1 It is a schematic diagram of the structure of the utility model;

[0060] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0061] Figure 3 This is a schematic diagram of the structure of the filter mechanism of the utility model;

[0062] Figure 4 This is a schematic diagram of the cross-sectional structure of the support groove of the utility model;

[0063] Figure 5 It is a cross-sectional structural schematic diagram of the swing mechanism of the utility model.

[0064] In the figure: 1. bottom cover; 2. air blowing hood; 3. support seat; 4. support shell; 5. first air inlet pipe; 6. air inlet nozzle; 7. second air inlet pipe; 8. first air supply pipe; 9. second air supply pipe; 10. third air supply pipe; 11. first annular rack; 12. first gear; 13. first motor; 14. first bevel gear; 15. second bevel gear; 16. second gear; 17. drive frame; 18. second rack; 19. drive disk; 20. drive rod; 21. second motor; 22. filter ring; 23. filter screen; 24. external threaded pipe. DETAILED DESCRIPTION

[0065] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0066] like Figure 1~Figure 5As shown, this embodiment proposes a device for reducing the final carbon and oxygen accumulation of a converter, comprising a bottom cover 1, a blowing hood 2, a blowing port, a filtering mechanism, an external thread, a support seat 3, a support shell 4 and an air intake mechanism. The side wall of the bottom cover 1 is provided with anti-slip grooves, the blowing hood 2 is fixedly arranged on the bottom cover 1, and the bottom cover 1 is provided with multiple mounting ports around the blowing port. The inner top wall of the blowing hood 2 is provided with multiple blowing ports. The filtering mechanism is arranged in the blowing port to prevent impurities from entering the converter and at the same time preventing impurities in the converter from entering the blowing hood 2. The outer wall of the blowing hood 2 is provided with an external thread. The support seat 3 is rotatably arranged on the inner bottom wall of the blowing hood 2. The side wall of the support seat 3 close to the bottom cover 1 is provided with a supporting groove. The support shell 4 is fixedly arranged on the support seat 3, and the air intake mechanism is arranged on the bottom cover 1 to supply air to the blowing hood 2.

[0067] Among them, the air intake mechanism includes a first air intake pipe 5, an air intake nozzle 6, a second air intake pipe 7, a first air supply pipe 8, a second air supply pipe 9, a third air supply pipe 10, a rotating mechanism and a swinging mechanism. A plurality of first air intake pipes 5 are connected and rotatably arranged on the support shell 4. The first air intake pipe 5 is sealed at one end away from the support shell 4. A plurality of air intake nozzles 6 are connected and arranged on each first air intake pipe 5. The second air intake pipe 7 is rotatably arranged on the bottom cover 1. The second air intake pipe 7 extends into the support shell 4. The first air supply pipe 8 is arranged on the bottom cover 1. The first air supply pipe 8 is connected with the second air intake pipe 7. The second air supply pipe 9 and the third air supply pipe 10 are connected and arranged on the first air supply pipe 8. A second control valve and a third control valve are arranged in the second air supply pipe 9 and the third air supply pipe 10. The rotating mechanism is arranged on the bottom cover 1 for controlling the support seat 3 to rotate. The swinging mechanism is arranged in the support groove for controlling the first air intake pipe 5 to swing.

[0068] Specifically, the operator connects the second gas supply pipe 9 with the oxygen storage box, and connects the third gas supply pipe 10 with the argon storage box, so that oxygen or argon can be blown into the blowing hood 2 through the first gas supply pipe 8 and the air inlet nozzle 6 by opening and closing the second control valve and the third control valve, and then gas can be supplied to the converter through the blowing port.

[0069] Among them, the rotating mechanism includes a first annular rack 11, a first gear 12 and a first motor 13. The first annular rack 11 is fixedly arranged on the side wall of the support seat 3, the first gear 12 is rotatably arranged on the bottom cover 1, the first gear 12 is meshed with the first annular rack 11, the first motor 13 is fixedly arranged on the bottom cover 1, and the output end of the first motor 13 is meshed with the first gear 12.

[0070] Specifically, during the gas supply process, the operator controls the operation of the first motor 13, and the operation of the first motor 13 can control the rotation of the first gear 12. At the same time, the engagement of the first gear 12 with the first annular rack 11 drives the support seat 3 to rotate, thereby causing the air intake nozzle 6 to move around the support seat 3, thereby evenly supplying gas to the converter through the blowing port.

[0071] Among them, the swing mechanism includes a first bevel gear 14, a first air inlet, a second bevel gear 15, a second air inlet and a reciprocating rotation mechanism. A plurality of first bevel gears 14 are rotatably arranged on the inner wall of the support shell 4. The first bevel gear 14 is fixedly connected to the first air inlet pipe 5. The first air inlet is opened on the first bevel gear 14, and the first air inlet is communicated with the first air inlet pipe 5. The second bevel gear 15 is fixedly arranged on the first air inlet pipe 5. The second bevel gear 15 is meshed with the first bevel gear 14. The second air inlet is opened on the second bevel gear 15, and the second air inlet is communicated with the second air inlet pipe 7. The reciprocating rotation mechanism is arranged in the support groove for controlling the second air inlet pipe 7 to swing. The reciprocating rotation mechanism includes a second gear 16, a driving frame 17, and a second rack 18 and a reciprocating mechanism, a second gear 16 is fixedly arranged on the side wall of the second air inlet pipe 7, a driving frame 17 is slidably arranged on the bottom cover 1, a second rack 18 is fixedly arranged on the side wall of the driving frame 17, the second rack 18 is meshed with the second gear 16, and the reciprocating mechanism is arranged in the support groove, which is used to control the reciprocating movement of the driving frame 17. The reciprocating mechanism includes a driving disk 19, a rotating shaft, a driving rod 20 and a second motor 21, the driving disk 19 is rotatably arranged at the bottom of the supporting groove, the driving disk 19 is rotatably arranged with a rotating shaft at an eccentric position, the driving rod 20 is hingedly arranged between the rotating shaft and the inner wall of the driving frame 17, the second motor 21 is fixedly arranged on the support seat 3, and the output end of the second motor 21 is fixedly connected to the driving disk 19.

[0072] Specifically, the operator controls the operation of the second motor 21, and the operation of the second motor 21 can drive the driving disk 19 to rotate. At the same time, the rotation of the driving disk 19 can drive the rotating shaft to rotate around the driving disk 19, and then the driving frame 17 and the second rack 18 are pulled to move back and forth through the driving rod 20. At the same time, the engagement of the second rack 18 with the second gear 16 can control the reciprocating rotation of the second air inlet pipe 7 and the second bevel gear 15, and then the engagement of the first bevel gear 14 with the second bevel gear 15 can drive the air intake nozzle 6 to swing around the first air inlet pipe 5, thereby further improving the uniformity of the air supply from the blowing port to the converter.

[0073] Among them, the filtering mechanism includes a filter ring 22, a filter net 23 and a mounting mechanism. A plurality of filter rings 22 are arranged on the air hood 2. The filter rings 22 correspond to the air ports one by one. The filter net 23 is arranged in the filter ring 22. The mounting mechanism is arranged between the filter ring 22 and the air hood 2 for installing and disassembling the filter ring 22. The mounting mechanism includes an internal thread and an external threaded tube 24. The air port is fixedly provided with an internal thread, and the external threaded tube 24 is fixedly provided on the filter ring 22, wherein the external threaded tube 24 extends into the air port through threaded cooperation.

[0074] Specifically, the air port can be protected by the filter 23, thereby preventing impurities in the converter from entering the air hood 2 and preventing impurities in the external environment from entering the converter. After the filter 23 reaches the end of its service life, the filter ring 22 can be replaced by rotating it.

[0075] In the present embodiment, when in use, the operator connects the second gas supply pipe 9 with the oxygen storage box, and connects the third gas supply pipe 10 with the argon storage box, so that oxygen or argon can be blown into the blowing hood 2 through the first gas supply pipe 8 and the gas inlet nozzle 6 by the opening and closing of the second control valve and the third control valve, and then gas can be supplied to the converter through the blowing port. During the gas supply process, the operator controls the first motor 13 to work, and the work of the first motor 13 can control the rotation of the first gear 12, and at the same time, the engagement of the first gear 12 with the first annular rack 11 drives the support seat 3 to rotate, so that the gas inlet nozzle 6 moves around the support seat 3, so as to evenly supply gas to the converter through the blowing port, and at the same time, the operator controls the work of the second motor 21, and the work of the second motor 21 can drive the drive disk 19 to rotate. The second rack 18 is driven by the driving rod 20 to pull the driving frame 17 and the second rack 18 to move back and forth. At the same time, the meshing of the second rack 18 and the second gear 16 can control the reciprocating rotation of the second air inlet pipe 7 and the second bevel gear 15, and then the meshing of the first bevel gear 14 and the second bevel gear 15 drives the air inlet nozzle 6 to swing around the first air inlet pipe 5, thereby further improving the uniformity of the air supply from the air port to the converter. During the air supply process, the air port can be protected by the filter 23, thereby preventing impurities in the converter from entering the air blowing hood 2 and preventing impurities in the external environment from entering the converter. After the filter 23 reaches its service life, the filter ring 22 can be replaced by rotating the filter ring 22.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for reducing the final carbon and oxygen accumulation in a converter, characterized in that: include: Bottom cover (1); An air blowing hood (2), the air blowing hood (2) being fixedly arranged on the bottom cover (1); Blowing ports, a plurality of blowing ports being provided on the inner top wall of the blowing hood (2); A filtering mechanism, the filtering mechanism being arranged in the air blowing port and being used to prevent impurities from entering the converter and at the same time preventing impurities in the converter from entering the air blowing hood (2); External thread, the outer wall of the blowing hood (2) is provided with an external thread; A support seat (3), the support seat (3) being rotatably arranged on the inner bottom wall of the blowing hood (2), and a support groove being provided on the side wall of the support seat (3) close to the bottom cover (1); A support shell (4), the support shell (4) being fixedly arranged on the support seat (3); An air intake mechanism, the air intake mechanism is arranged on the bottom cover (1) and is used to supply air into the blowing hood (2).

2. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 1, characterized in that: The air intake mechanism comprises: A first air intake pipe (5), a plurality of the first air intake pipes (5) being connected and rotatably arranged on the support shell (4), and one end of the first air intake pipe (5) away from the support shell (4) is sealed; An air intake nozzle (6), each of the first air intake pipes (5) being connected and provided with a plurality of the air intake nozzles (6); a second air inlet pipe (7), the second air inlet pipe (7) being rotatably arranged on the bottom cover (1), the second air inlet pipe (7) extending into the supporting shell (4); a first air supply pipe (8), the first air supply pipe (8) being arranged on the bottom cover (1), the first air supply pipe (8) being in communication with the second air inlet pipe (7); a second air supply pipe (9) and a third air supply pipe (10), wherein the second air supply pipe (9) and the third air supply pipe (10) are arranged in communication with the first air supply pipe (8); Wherein, a second control valve and a third control valve are arranged in the second air supply pipe (9) and the third air supply pipe (10); A rotating mechanism, the rotating mechanism being arranged on the bottom cover (1) and being used to control the support seat (3) to rotate; A swing mechanism, the swing mechanism being arranged in the support groove and being used for controlling the first air intake pipe (5) to swing.

3. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 2, characterized in that: The rotating mechanism comprises: a first annular rack (11), the first annular rack (11) being fixedly arranged on a side wall of the support seat (3); a first gear (12), the first gear (12) being rotatably disposed on the bottom cover (1), the first gear (12) being meshed with the first annular rack (11); A first motor (13), wherein the first motor (13) is fixedly arranged on the bottom cover (1), and an output end of the first motor (13) is meshed with the first gear (12).

4. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 3, characterized in that: The swing mechanism comprises: a first bevel gear (14), a plurality of the first bevel gears (14) being rotatably arranged on the inner wall of the support housing (4), and the first bevel gears (14) being fixedly connected to the first air intake pipe (5); A first air inlet, the first air inlet being provided on the first bevel gear (14), the first air inlet being in communication with the first air inlet pipe (5); a second bevel gear (15), the second bevel gear (15) being fixedly arranged on the first air intake pipe (5), the second bevel gear (15) being meshed with the first bevel gear (14); A second air inlet, the second air inlet being provided on the second bevel gear (15), the second air inlet being in communication with the second air inlet pipe (7); A reciprocating rotating mechanism, the reciprocating rotating mechanism is arranged in the supporting groove and is used to control the second air intake pipe (7) to swing.

5. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 4, characterized in that: The reciprocating rotating mechanism comprises: A second gear (16), the second gear (16) being fixedly arranged on a side wall of the second air intake pipe (7); A driving frame (17), the driving frame (17) being slidably disposed on the bottom cover (1); a second rack (18), the second rack (18) being fixedly arranged on a side wall of the driving frame (17), the second rack (18) being meshed with the second gear (16); A reciprocating mechanism, the reciprocating mechanism being arranged in the supporting groove and being used for controlling the driving frame (17) to perform reciprocating movement.

6. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 5, characterized in that: The reciprocating mechanism comprises: A driving disk (19), the driving disk (19) being rotatably disposed at the bottom of the supporting groove; A rotating shaft, on which the eccentric position of the driving disc (19) is rotatably provided; A driving rod (20), the driving rod (20) being hingedly arranged between the rotating shaft and an inner wall of the driving frame (17); A second motor (21), wherein the second motor (21) is fixedly disposed on the support seat (3), and an output end of the second motor (21) is fixedly connected to the driving disc (19).

7. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 6, characterized in that: The filtering mechanism comprises: A filter ring (22), wherein a plurality of the filter rings (22) are provided on the air blowing hood (2), and the filter rings (22) correspond one to one to the air blowing ports; A filter screen (23), the filter screen (23) being arranged inside the filter ring (22); An installation mechanism, wherein the installation mechanism is arranged between the filter ring (22) and the air blowing hood (2) and is used for installing and removing the filter ring (22).

8. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 7, characterized in that: The mounting mechanism comprises: Internal thread, the air port is fixedly provided with an internal thread; An externally threaded tube (24), the externally threaded tube (24) being fixedly arranged on the filter ring (22); Wherein, the externally threaded tube (24) extends into the blowing port through threaded engagement.

9. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 8, characterized in that: The bottom cover (1) is provided with a plurality of mounting openings on the periphery of the air blowing opening.

10. The device for reducing the final carbon and oxygen accumulation in a converter according to claim 9, characterized in that: The side wall of the bottom cover (1) is provided with anti-slip grooves.

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