Double-hammerhead automatic slag poking hammer-shaped valve

Abstract

The utility model relates to the technical field of circulating fluidized bed boilers, in particular to a double-hammerhead automatic slag poking hammer-shaped valve which comprises a valve body, a slag discharging opening communicated with the valve body is formed in the position, connected with the fluidized bed boiler, of the valve body, and a valve rod assembly and a slag poking rod assembly are installed on the side, away from the fluidized bed boiler, of the valve body. The valve rod assembly is communicated with the interior of the valve body through a first communicating hole aligned with the slag discharging opening, and a valve rod in the valve rod assembly penetrates into the valve body through the first communicating hole to be used for controlling opening and closing of the slag discharging opening. The slag poking rod assembly is communicated with the interior of the valve body through a second communicating hole aligned with the slag discharging opening, and a slag poking rod in the slag poking rod assembly penetrates into the valve body through the second communicating hole to be used for dredging the slag discharging opening. The valve rod and the slag poking rod are controlled through the valve rod assembly and the slag poking rod assembly which are relatively independent, and the valve rod assembly and the slag poking rod assembly can operate independently. When the valve rod is used for blocking the slag discharging opening, the slag poking rod does not participate in slag poking dredging work, and the slag poking rod or the slag poking rod assembly can be maintained when needed.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, specifically to a double-hammer automatic slag-removing hammer valve. Background Technology

[0002] The development and application of circulating fluidized bed boiler technology have been widely adopted. This technology is one of the advanced technologies for clean coal combustion and achieving sustainable development strategies. It integrates advantages such as energy saving, clean combustion, safety and reliability, and reduced pollution emissions. However, in actual boiler operation, some local structural problems can also affect boiler efficiency. For example, the problem of shutting off the ash discharge port seriously affects the safe and economical operation of the boiler. Therefore, the National Energy Administration's 2023 "Twenty-Five Key Requirements for Preventing Power Production Accidents" requires the use of advanced electric hammer valves for the ash discharge gate.

[0003] In addition, the common method for unblocking the ash discharge port of a circulating fluidized bed boiler is to install a slag-plucking inclined pipe on the valve or ash discharge pipe to facilitate unblocking when ash is blocked. Once the ash discharge port is blocked, the conventional unblocking method is to organize personnel to manually pry the ash with a slag-plucking rod inserted into the boiler ash discharge port through the slag-plucking inclined pipe, which is labor-intensive for on-site operators. Because the furnace of a circulating fluidized bed boiler is under slight positive pressure, there is a risk of high-temperature ash leakage during slag slugging, which can easily cause burns and poses a significant safety hazard. For this reason, our company proposed a rotary automatic slag-plucking hammer-shaped ash control valve in a previously filed patent application, Chinese utility model application number CN202220749189.4, which achieves both slag slugging and valve switching functions by installing a slag-plucking rod movable inside the valve stem. After our company implemented this solution in some projects for a period of time, we found that in some projects, after long-term use, the slag-plucking rod required maintenance. However, this utility model requires the removal of the valve stem to maintain the slag-plucking rod, which is relatively troublesome.

[0004] Based on safety requirements and to solve the problem of frequent slag blockage at the slag discharge port, this utility model proposes another solution that can simultaneously satisfy the functions of slag removal and hammer valve switching, while also allowing for separate disassembly and maintenance of the slag removal rod and valve stem hammer. Utility Model Content

[0005] The purpose of this utility model is to provide a double-hammer automatic slag-clearing hammer valve that, while fulfilling the two functions of slag clearing and valve switching, also allows for separate disassembly and maintenance of the slag-clearing rod and valve stem hammer.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A double-hammer automatic slag-clearing hammer valve includes a valve body. A slag discharge port, communicating with the valve body, is provided at the portion of the valve body connected to a fluidized bed boiler. A valve stem assembly and a slag-clearing rod assembly are installed on the side of the valve body away from the fluidized bed boiler. The valve stem assembly and the slag-clearing rod assembly are arranged in a Y-shape with the valve body. The valve stem assembly communicates with the interior of the valve body through a first connecting hole aligned with the slag discharge port. The valve stem within the valve stem assembly passes through the first connecting hole into the valve body to control the opening and closing of the slag discharge port. The slag-clearing rod assembly communicates with the interior of the valve body through a second connecting hole aligned with the slag discharge port. The slag-clearing rod within the slag-clearing rod assembly passes through the second connecting hole into the valve body to clear the slag discharge port.

[0008] A further technical solution is that a first sliding rail is provided inside the valve stem assembly along the axial direction of the valve stem, the valve stem is slidably connected to the first sliding rail inside the valve stem assembly, and a first driving part is installed on the valve stem assembly for driving the valve stem to reciprocate along the first sliding rail.

[0009] A further technical solution is that the first drive unit includes a first motor, a lead screw, a drive block, a round rod, and a fixed block. The lead screw is arranged parallel to the valve stem within the drive assembly. The drive block is threadedly fitted onto the surface of the lead screw. The end of the lead screw away from the valve body passes through the valve body assembly and is connected to the first motor for transmission. The fixed block is fixedly installed within the valve body assembly. The end of the lead screw within the valve body assembly is rotatably connected to the fixed block via a bearing. The end of the valve stem away from the valve body is fixedly connected to the drive block. A round hole is provided through the drive block along the axial direction of the lead screw. The round rod is slidably disposed within the round hole. One end of the round rod is fixedly connected to the fixed block, and the other end is fixedly connected to the inner wall of the drive assembly at the end away from the valve body.

[0010] A further technical solution is that the valve stem is slidably connected to the first sliding rail via a first guide rail pulley group.

[0011] A further technical solution is that a second sliding rail is provided inside the slag-pumping rod assembly along the axial direction of the slag-pumping rod, the slag-pumping rod is slidably connected to the second sliding rail inside the slag-pumping rod assembly, and a second drive unit is installed on the slag-pumping rod assembly for the slag-pumping rod to reciprocate along the second sliding rail.

[0012] A further technical solution is that the second drive unit includes a second motor, a first sprocket, a second sprocket, and a chain. The first sprocket and the second sprocket are respectively disposed at both ends of the second sliding track. The chain drive is sleeved on the first sprocket and the second sprocket. The chain is fixedly connected to the slag-pumping rod. The second motor is connected to the first sprocket drive.

[0013] A further technical solution is that the slag-pumping rod is slidably connected to the second sliding track via a second guide rail pulley group; the chain is fixedly connected to the second guide rail pulley group.

[0014] A further technical solution is that a cleaning ring is provided inside the first connecting hole, and several purging holes are provided on the inner side of the cleaning ring. An air inlet is provided on the outer wall of the cleaning ring, which is connected to the purging holes and is connected to an external air supply device. The inner wall of the cleaning ring is sealed to the outer wall of the valve stem on the side of the purging holes away from the valve body by a high-temperature resistant sealing ring.

[0015] A further technical solution involves a large hammerhead positioned at the end of the valve stem facing the slag discharge port; a small hammerhead is positioned at the end of the slag-pumping rod facing the slag discharge port and is integrated with the slag-pumping rod. The large hammerhead is bolted to the valve stem; the small hammerhead is welded to the slag-pumping rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are: by controlling the valve stem and slag-poke rod separately through relatively independent valve stem assembly and slag-poke rod assembly, they can operate independently of each other. When using the valve stem and large hammer head to block the slag discharge port, the large hammer head at the end of the valve stem is extended to the position of the slag discharge port to block the slag discharge port through the valve stem assembly, and the slag-poke rod assembly is retracted to the end away from the valve body. At this time, the slag discharge port will not discharge slag, and the slag-poke rod does not participate in the slag-poke unblocking work; when it is necessary to unblock and poke slag, the large hammer head at the end of the valve stem is retracted to the end away from the valve body through the valve stem assembly. At this time, the slag-poke rod assembly drives the slag-poke rod and small hammer head into the slag discharge port to unblock it. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one state of the double-hammer automatic slag-removing hammer valve of this utility model.

[0018] Figure 2 This is a schematic diagram of another state of the double-hammer automatic slag-removing hammer valve of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the slag-scraping rod assembly of a double-hammer automatic slag-scraping hammer valve according to this utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the valve stem assembly of a double-hammer automatic slag-clearing hammer valve according to this utility model.

[0021] Figure 5 for Figure 2 A magnified view of the area marked A in the middle.

[0022] Icons: 1-Valve body, 2-Fluidized bed boiler, 3-Slag discharge port, 4-Valve stem assembly, 5-Valve stem, 6-Slag-poke rod assembly, 7-First connecting hole, 8-Second connecting hole, 9-Slag-poke rod, 10-First sliding rail, 11-First motor, 12-Screw rod, 13-Drive block, 14-Round rod, 15-Fixing block, 16-Bearing, 17-Round hole, 18-First guide rail pulley group, 19-Second sliding rail, 20-Second motor, 21-First sprocket, 22-Second sprocket, 23-Chain, 24-Second guide rail pulley group, 25-Cleaning ring, 26-Purge hole, 27-Air inlet, 28-High temperature resistant sealing ring, 29-Large hammerhead, 30-Small hammerhead. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] Figures 1 to 5 The following is an embodiment of the present invention.

[0025] Example 1:

[0026] like Figure 1 , Figure 2As shown, a double-hammer automatic slag-clearing hammer valve includes a valve body 1. A slag discharge port 3, connected to a fluidized bed boiler 2, is provided on the part of the valve body 1 that communicates with the valve body 1. A valve stem assembly 4 and a slag-clearing rod assembly 6 are installed on the side of the valve body 1 away from the fluidized bed boiler 2. The valve stem assembly 4 communicates with the interior of the valve body 1 through a first connecting hole 7 aligned with the slag discharge port 3. A valve stem 5 within the valve stem assembly 4 passes through the first connecting hole 7 into the valve body 1 to control the opening and closing of the slag discharge port 3. The slag-clearing rod assembly 6 communicates with the interior of the valve body 1 through a second connecting hole 8 aligned with the slag discharge port 3. A slag-clearing rod 9 within the slag-clearing rod assembly 6 passes through the second connecting hole 8 into the valve body 1 to clear the slag discharge port 3. The valve stem 5 and slag-clearing rod 9 are controlled independently by the relatively independent valve stem assembly 4 and slag-clearing rod assembly 6, allowing for independent operation. When using valve stem 5 to block slag discharge port 3, the end of valve stem 5 is extended to the position of slag discharge port 3 to block it via valve stem assembly 4, and slag-poke rod assembly 6 retracts slag-poke rod 9. At this time, slag discharge port 3 will not discharge slag, and slag-poke rod 9 will not participate in slag-poke unblocking work. Slag-poke rod 9 or slag-poke rod assembly 6 can be maintained when needed. When unblocking and slag-poke is required, valve stem 5 is retracted via valve stem assembly 4, and slag-poke rod assembly 6 drives slag-poke rod 9 into slag discharge port 3 for unblocking. Valve stem assembly 4 and slag-poke rod assembly 6 are arranged parallel to each other on the side of valve body 1 away from fluidized bed boiler 2, with the ends of valve stem assembly 4 and slag-poke rod assembly 6 connected to valve body 1 approaching each other and the other ends gradually separating. This allows for an angle between valve stem 5 and slag-poke rod 9, the angle and position of which can be flexibly positioned according to the site conditions, facilitating independent operation while ensuring both are aligned with slag discharge port 3.

[0027] Example 2:

[0028] Based on the foregoing embodiments, such as Figure 4 As shown, a first sliding track 10 is provided inside the valve stem assembly 4 along the axial direction of the valve stem 5. The valve stem 5 is slidably connected to the first sliding track 10 inside the valve stem assembly 4. A first driving part is installed on the valve stem assembly 4 to drive the valve stem 5 to reciprocate along the first sliding track 10. By providing the first sliding track 10, the valve stem 5 can be guided to reciprocate within the valve stem assembly 4, preventing the valve stem 5 from deviating during movement and causing the valve stem 5 to jam with the first connecting hole 7.

[0029] The first drive unit includes a first motor 11, a lead screw 12, a drive block 13, a round rod 14, and a fixing block 15. The lead screw 12 is arranged parallel to the valve stem 5 within the drive assembly. The drive block 13 is threadedly fitted onto the surface of the lead screw 12, and a threaded hole is provided in the middle of the drive block 13 for threaded fitting onto the surface of the lead screw 12. The end of the lead screw 12 away from the valve body 1 protrudes from the valve body 1 assembly and is connected to the first motor 11 for transmission. The fixing block 15 is fixedly installed within the valve body 1 assembly. The end of the lead screw 12 within the valve body 1 assembly is rotatably connected to the fixing block 15 via a bearing 16. The end of the valve stem 5 away from the valve body 1 is fixedly connected to the drive block 13. A round hole 17 is provided through the drive block 13 along the axial direction of the lead screw 12. The round rod 14 is slidably disposed within the round hole 17. One end of the round rod 14 is fixedly connected to the fixing block 15, and the other end is fixedly connected to the inner wall of the drive assembly at the end away from the valve body 1. By starting the first motor 11, the lead screw 12 is driven to rotate. Because the drive block 13 is limited by the rotation of the round rod 14 and the valve stem 5, it cannot rotate with the lead screw 12. Therefore, when the lead screw 12 rotates, it can only move along its axial direction. This allows the valve stem 5 to move back and forth along the axial direction of the lead screw 12. Thus, when it is necessary to block the slag discharge port 3, the rotation of the lead screw 12 drives the drive block 13 towards the slag discharge port 3, thereby blocking the slag discharge port 3. Conversely, when it is necessary to open the slag discharge port 3, the lead screw 12 drives the drive block 13 away from the slag discharge port 3. Using the lead screw 12 to drive the valve stem 5 improves the accuracy of the valve stem 5's displacement and prevents the valve stem 5 from retracting when blocking the slag discharge port 3, thus avoiding sealing failure. The round rod 14 and the round hole 17 work together to guide and limit the rotation of the drive block 13. By setting the fixing block 15, it can serve as a support component for the round rod 14 and the lead screw 12. The smoothness of the rotation of the lead screw 12 can be improved by the cooperation of the fixing block 15 and the bearing 16.

[0030] The valve stem 5 is slidably connected to the first sliding rail 10 via a first guide rail pulley assembly 18. By setting the first guide rail pulley assembly 18, the smoothness of sliding between the valve stem 5 and the first sliding rail 10 can be improved. Multiple first guide rail pulley assemblies 18 are configured and mounted together on the same first mounting plate. These multiple first guide rail pulley assemblies 18 can slide with the first sliding rail 10 by clamping opposite sides of the first sliding rail 10, while simultaneously preventing the first guide rail pulley assemblies 18 from derailing from the first sliding rail 10. The first mounting plate is fixedly connected to the valve stem 5.

[0031] Example 3:

[0032] Based on the foregoing embodiments, such as Figure 3As shown, a second sliding rail 19 is provided inside the slag-pumping rod assembly 6 along the axial direction of the slag-pumping rod 9. The slag-pumping rod 9 is slidably connected to the second sliding rail 19 inside the slag-pumping rod assembly 6. A second driving part for the reciprocating motion of the slag-pumping rod 9 along the second sliding rail 19 is installed on the slag-pumping rod assembly 6. By providing the second sliding rail 19, the slag-pumping rod 9 can be guided to reciprocate within the slag-pumping rod assembly 6, preventing the slag-pumping rod 9 from deviating during movement and causing it to jam between the slag-pumping rod 9 and the second connecting hole 8.

[0033] The second drive unit includes a second motor 20, a first sprocket 21, a second sprocket 22, and a chain 23. The first sprocket 21 and the second sprocket 22 are respectively located at both ends of the second sliding track 19. The chain 23 is driven and sleeved on the first sprocket 21 and the second sprocket 22. The chain 23 is fixedly connected to the slag-clearing rod 9, and the second motor 20 is driven and connected to the first sprocket 21. When it is necessary to clear the slag discharge port 3, the second motor 20 drives the first sprocket 21 to rotate periodically. This allows the chain 23 to drive the slag-clearing rod 9 to reciprocate along the direction of the second sliding track 19. The end of the slag-clearing rod 9, located inside the valve body 1, reciprocates into the slag discharge port 3 to clear the blockage. The use of the chain 23 and sprockets allows for more efficient conversion of the rotational speed of the second motor 20 into the linear motion speed of the slag-clearing rod 9, thus achieving a highly efficient slag-clearing effect.

[0034] The slag-pumping rod 9 is slidably connected to the second sliding rail 19 via the second guide rail pulley group 24; the chain 23 is fixedly connected to the second guide rail pulley group 24. By setting the second guide rail pulley group 24, the smoothness of the sliding of the slag-pumping rod 9 and the second sliding rail 19 can be improved. Multiple second guide rail pulley groups 24 are configured and installed together on the same second mounting plate. These multiple second guide rail pulley groups 24 can achieve sliding with the second sliding rail 19 by clamping opposite sides of the second sliding rail 19, while simultaneously preventing the second guide rail pulley groups 24 from derailing from the second sliding rail 19. The second mounting plate is fixedly connected to the slag-pumping rod 9 and the chain 23.

[0035] Example 4:

[0036] Based on the foregoing embodiments, such as Figure 5As shown, a cleaning ring 25 is provided inside the first connecting hole 7. Several purge holes 26 are provided on the inner side of the cleaning ring 25. An air inlet 27 connected to the purge holes 26 is provided on the outer wall of the cleaning ring 25. The air inlet 27 is sealed and fitted to the outer wall of the valve stem 5 of the external air supply equipment. By setting the cleaning ring 25, it is possible to prevent the valve stem 5 from being connected when it retracts into the valve stem assembly 4. When the inner wall of the cleaning ring 25 is connected to the valve stem assembly 4 through the high-temperature sealing ring 28 on the side of the purge hole 26 away from the valve body 1, the ash and slag will be carried into the valve stem assembly 4. This ash and slag can easily affect the movement of the lead screw 12 and cause the lead screw 12 to jam with the drive block 13. The cross-section of the purge hole 26 is inclined, with the bottom of the groove and the groove opening inclined towards the inside of the valve body 1. In this way, when the valve stem 5 retracts into the valve stem assembly 4, the ash and slag can be blown back into the valve body 1. At the same time, the valve stem 5 can also be cooled down during the purging, preventing the valve stem 5 from heating up too quickly. By setting a high-temperature resistant sealing ring 28, the gap between the valve stem 5 and the cleaning ring 25 can be sealed, further reducing the possibility of ash and slag entering the valve stem assembly 4. At the same time, the high-temperature resistant sealing ring 28 can also guide the valve stem 5.

[0037] A large hammerhead 29 is installed at the end of the valve stem 5 facing the slag discharge port 3; a small hammerhead 30 is installed at the end of the slag-clearing rod 9 facing the slag discharge port 3. The large hammerhead 29 is larger than the slag discharge port 3, thus enabling it to block the slag discharge port 3. The large hammerhead 29 can be detachably installed on the valve stem 5 for easy replacement or repair during subsequent maintenance. The small hammerhead 30 can break up the ash and slag blocking the slag discharge port 3 during its reciprocating motion, thereby clearing the blockage. The large hammerhead 29 is bolted to the valve stem 5; the small hammerhead 30 is welded to the slag-clearing rod 9.

[0038] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A double-hammer automatic slag-removing hammer valve, comprising a valve body (1), wherein the valve body (1) is provided with a slag discharge port (3) communicating with the valve body (1) at the part connected to the fluidized bed boiler (2), characterized in that, The valve body (1) is equipped with a valve stem assembly (4) and a slag-clearing rod assembly (6) on the side away from the fluidized bed boiler (2). The valve stem assembly (4) and the slag-clearing rod assembly (6) are arranged in a Y-shape with the valve body (1). The valve stem assembly (4) is connected to the inside of the valve body (1) through a first connecting hole (7) aligned with the slag discharge port (3). The valve stem (5) in the valve stem assembly (4) passes through the first connecting hole (7) into the valve body (1) to control the opening and closing of the slag discharge port (3). The slag-clearing rod assembly (6) is connected to the inside of the valve body (1) through a second connecting hole (8) aligned with the slag discharge port (3). The slag-clearing rod (9) in the slag-clearing rod assembly (6) passes through the second connecting hole (8) into the valve body (1) to clear the slag discharge port (3).

2. The automatic slag-removing hammer valve with double hammerheads according to claim 1, characterized in that: The valve stem assembly (4) is provided with a first sliding track (10) along the axial direction of the valve stem (5). The valve stem (5) is slidably connected to the first sliding track (10) in the valve stem assembly (4). The valve stem assembly (4) is equipped with a first driving part for driving the valve stem (5) to reciprocate along the first sliding track (10).

3. The automatic slag-removing hammer valve with double hammerheads according to claim 2, characterized in that: The first drive unit includes a first motor (11), a lead screw (12), a drive block (13), a round rod (14), and a fixing block (15). The lead screw (12) is arranged parallel to the valve stem (5) within the drive assembly. The drive block (13) is threadedly fitted onto the surface of the lead screw (12). One end of the lead screw (12) away from the valve body (1) extends out of the valve body (1) assembly and is connected to the first motor (11) for transmission. The fixing block (15) is fixedly installed within the valve body (1) assembly. 12) One end of the valve body (1) assembly is rotatably connected to the fixed block (15) via a bearing (16); the end of the valve stem (5) away from the valve body (1) is fixedly connected to the drive block (13); a circular hole (17) is provided through the drive block (13) along the axial direction of the lead screw (12), and the circular rod (14) is slidably disposed in the circular hole (17). One end of the circular rod (14) is fixedly connected to the fixed block (15), and the other end is fixedly connected to the inner wall of the drive assembly away from the valve body (1).

4. The double-hammer automatic slag-removing hammer valve according to claim 3, characterized in that: The valve stem (5) is slidably connected to the first sliding rail (10) via the first guide rail pulley group (18).

5. The automatic slag-removing hammer valve with double hammerheads according to claim 1, characterized in that: The slag-pumping rod assembly (6) is provided with a second sliding rail (19) along the axial direction of the slag-pumping rod (9). The slag-pumping rod (9) is slidably connected to the second sliding rail (19) in the slag-pumping rod assembly (6). The slag-pumping rod assembly (6) is equipped with a second driving part for the slag-pumping rod (9) to reciprocate along the second sliding rail (19).

6. The automatic slag-removing hammer valve with double hammerheads according to claim 5, characterized in that: The second drive unit includes a second motor (20), a first sprocket (21), a second sprocket (22), and a chain (23). The first sprocket (21) and the second sprocket (22) are respectively disposed at both ends of the second sliding track (19). The chain (23) is driven and sleeved on the first sprocket (21) and the second sprocket (22). The chain (23) is fixedly connected to the slag-pumping rod (9). The second motor (20) is driven and connected to the first sprocket (21).

7. The double-hammer automatic slag-removing hammer valve according to claim 6, characterized in that: The slag-pumping rod (9) is slidably connected to the second sliding track (19) via the second guide rail pulley group (24); the chain (23) is fixedly connected to the second guide rail pulley group (24).

8. The automatic slag-removing hammer valve with double hammerheads according to claim 1, characterized in that: A cleaning ring (25) is provided inside the first connecting hole (7). Several purge holes (26) are provided on the inner side of the cleaning ring (25). An air inlet (27) is provided on the outer wall of the cleaning ring (25) and communicates with the purge holes (26). The air inlet (27) is connected to an external air supply device. The inner wall of the cleaning ring (25) is sealed to the outer wall of the valve stem (5) on the side of the purge hole (26) away from the valve body (1) by a high-temperature resistant sealing ring (28).

9. The automatic slag-removing hammer valve with double hammerheads according to claim 1, characterized in that: The valve stem (5) is provided with a large hammer head (29) at one end facing the slag discharge port (3), and the large hammer head (29) is bolted to the valve stem (5); the slag-pumping rod (9) is provided with a small hammer head (30) at one end facing the slag discharge port (3), and the small hammer head (30) is welded to the slag-pumping rod (9).

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