Hot forging die for roller

Abstract

The utility model discloses a hot forging die for a roller, which relates to the technical field of hot forging dies and comprises a shell, a control component and a cooling component. When a hot forging die needs to be used for producing a roller, a material is put into the opened die, then the die-casting device is started, the die-casting device pushes the material into the first die and the second die and continuously extrudes the first die and the second die, and the first die and the second die abut against each other and move downwards at the moment; the first die and the second die move downwards and extrude a supporting plate to enable a reset spring to contract, at the moment, a first pressing plate and a second pressing plate move to drive a cooling component and a control component to work, after die-casting forming, the die-casting device restores to the original position, and the first die and the second die move reversely under the acting force of the reset spring; and when the reset spring restores to the original position, the first die is obliquely opened under the acting force of the control component, a worker can take and place the first die conveniently, and meanwhile the cooling component cools the die-cast roller.

Description

Technical Field

[0001] The utility model relates to the technical field of hot forging dies, in particular to a hot forging die for a rolling mill. Background Art

[0002] At present, hot forging technology is widely used in standard parts forming. Hot forging has many advantages: reducing the deformation resistance of metal, thereby reducing the forging pressure required for billet deformation, greatly reducing the tonnage of forging equipment; changing the cast structure of the steel ingot, through recrystallization during the hot forging process, the coarse cast structure becomes a new structure of fine grains, and reduces the defects of the cast structure, improving the mechanical properties of steel; improving the plasticity of steel, which is especially important for some high-alloy steels that are brittle and difficult to forge at low temperatures.

[0003] After the existing hot forging die for rolling mill is finalized, it is inconvenient for workers to take out the rolling mill due to the high temperature, which reduces the workers' work efficiency. Moreover, under high temperature conditions, it is easy to damage the equipment, affecting the workers' use and increasing the cost of use. Therefore, we need a hot forging die for rolling mill.

[0004] The prior art proposes a Chinese patent with publication number CN 213794028U to solve the above-mentioned technical problems. The technical solution disclosed in the patent document is as follows: a hot forging die for a rolling mill, comprising a base, a motor fixedly connected to the bottom of the base, a rotating rod fixedly connected to the output end of the motor, a threaded rod fixedly connected to one end of the rotating rod, a moving block threadedly connected to the outer surface of the threaded rod, a connecting rod fixedly connected to the top of the moving block, a left die fixedly connected to the top of the connecting rod, a right die movably connected to one side of the left die, a radiator fixedly connected to the top of the base, and a fan fixedly connected to the inner top wall of the radiator. The utility model can move the left die and the right die through the setting of the motor, which is convenient for workers to take the formed items, improve the work efficiency of workers, and facilitate workers to use. Through the setting of the fan, it can prevent the left die and the right die from being damaged under continuous high temperature, and improve the service life of the equipment. However, the cooling effect of the device during operation is not ideal, and it is not convenient for manual picking and placing. Utility Model Content

[0005] The utility model aims to provide a hot forging die for a rolling mill to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A hot forging die for a rolling mill, wherein a die-casting device is arranged above a shell, the die-casting device is fixedly connected to the shell, a fixed groove is provided on the shell, a first die and a second die are slidably connected in the fixed groove, one end of the first die is rotatably connected to the second die through a rotating shaft, a support plate is slidably connected inside the fixed groove, a return spring is fixedly connected to the end of the support plate away from the first die, the other end of the return spring is fixedly connected to the shell, a support shaft is slidably connected on the support plate, the support shaft is slidably connected to the shell, a cooling component for cooling the rolling mill is connected to one end of the support shaft, a control component for controlling the position of the first die and the second die is connected to the upper surface of the shell, a support rod is fixedly connected to the shell, and a plurality of nozzles are evenly arranged on the support rod.

[0008] When it is necessary to produce rolling mill rollers with hot forging dies, the material is placed in the open die and then the die-casting device is started. The die-casting device pushes the material into the first die and the second die and continuously extrudes the material. At this time, the first die and the second die collide with each other and move downward. The first die and the second die move downward and squeeze the support plate to shrink the reset spring. At this time, the movement of the first pressure plate and the second pressure plate will also drive the cooling component and the control component to work. After die-casting, the die-casting device returns to its original position, and the first die and the second die move in the opposite direction under the action of the reset spring. When the reset spring returns to its original position, the first die is tilted open under the action of the control component, so as to facilitate the staff to take and put. At the same time, the cooling component also starts to work to cool the die-cast rolling mill roller.

[0009] A further improvement of the technical solution of the utility model is that: the control component includes a baffle, the baffle is fixedly connected to the shell, a first connecting rod and a second connecting rod are arranged at one end of the baffle, the first connecting rod is hinged to the baffle, a first pressure plate is fixedly connected to the side of the first connecting rod away from the baffle, a pressure spring is fixedly connected to the side of the first pressure plate close to the baffle, the second connecting rod is rotatably connected to one end of the first mold close to the die-casting device, the other end of the second connecting rod is fixedly connected to the second pressure plate, the other end of the pressure spring is fixedly connected to the second pressure plate, the second connecting rod is slidably connected to the first pressure plate, the first connecting rod is slidably connected to the second pressure plate, a protective shell is slidably connected to the outer side of the first pressure plate, and the second pressure plate is slidably connected to the protective shell.

[0010] The above-mentioned technical scheme is adopted. In this scheme, when the die-casting device is performing die-casting, the distance between the first mold and the baffle is the shortest. At this time, the distance between the first pressure plate and the second pressure plate is the shortest, and the pressure spring is in a compressed state. When the die-casting device completes die-casting, the first mold moves upward under the action of the reset spring, and the pressure spring will rebound, so that the distance between the first pressure plate and the second pressure plate will be extended. At this time, the first mold will gradually tilt due to the pulling force of the pressure spring, thereby exposing the rolling roller that has just been die-cast.

[0011] A further improvement of the technical solution of the utility model is that the cooling component includes a fixed rod, the fixed rod is fixedly connected to the other end of the supporting shaft, a support rod is fixedly connected to the fixed rod, the support rod is symmetrically arranged, a piston plate is fixedly connected to the other end of the support rod, a cylinder body is slidably connected to the outer side of the piston plate, an air intake pipe and a ventilation pipe are respectively opened on both sides of the cylinder body, the other end of the ventilation pipe is connected to the nozzle, a one-way valve is fixedly connected in the air intake pipe and the ventilation pipe, a fixed plate is fixedly connected to the support rod, one end of the fixed plate is fixedly connected to an elastic spring, the other end of the elastic spring is fixedly connected to the shell, and the fixed plate is slidably connected to the shell.

[0012] The above-mentioned technical scheme is adopted. In this scheme, when the die-casting device die-casts the material, the first mold and the second mold will push the support shaft to move downward, the reset spring is in a compressed state, and the support shaft will drive the support rod to move downward through the fixed rod, thereby driving the piston plate to move. The elastic spring is in a compressed state. The movement of the piston plate will cause a pressure difference between the inside and outside of the cylinder body. Air enters through the intake pipe and the one-way valve. When the die-casting device completes die-casting, the first mold and the second mold move upward under the action of the reset spring and the elastic spring. At this time, the piston plate moves upward, squeezing the air, and the one-way valve in the ventilation pipe opens. The air will be transported to the nozzle and sprayed out, thereby achieving the purpose of cooling the roller.

[0013] A further improvement of the technical solution of the utility model is that the connection between the shell and the fixing groove is set as a rounded corner.

[0014] The above-mentioned technical solution is adopted, in which a rounded corner is provided at the connection between the shell and the fixed groove, so that the movement amplitude of the first mold can be reduced when the control component stretches the first mold, thereby preventing the roller from popping out due to excessive movement of the first mold, thereby achieving the purpose of better protecting the staff.

[0015] A further improvement of the technical solution of the utility model is that a fixing block is fixedly connected and arranged inside the shell, and the height of the fixing block is greater than the minimum contraction length of the return spring.

[0016] The above technical solution is adopted. In this solution, because the pressure applied by the die-casting device to the mold during die-casting is very large, the reset spring can be better protected by setting the height of the fixed block greater than the minimum contraction length of the reset spring, thereby extending the service life of the reset spring and improving the working efficiency of the device.

[0017] A further improvement of the technical solution of the utility model is that a filter screen is fixedly connected and arranged in the air intake pipe.

[0018] The above technical solution is adopted. In this solution, because the air contains some large dust particles in the environment of the die-casting roller, the particles may block the nozzle during operation, which not only reduces the work efficiency but also may cause harm to the staff. By setting a filter, the dust and particles can be effectively isolated outside, greatly improving the working efficiency of the device.

[0019] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0020] 1. The utility model provides a hot forging die for a rolling mill. When the material is die-casted by a die-casting device, the first die and the second die will push the support shaft to move downward, the reset spring is in a compressed state, the support shaft will drive the support rod to move downward through the fixed rod, thereby driving the piston plate to move, the elastic spring is in a compressed state, the movement of the piston plate will cause a pressure difference between the inside and outside of the cylinder body, and air enters through the air intake pipe and the one-way valve. When the die-casting device completes die-casting, the first die and the second die move upward under the action of the reset spring and the elastic spring. At this time, the piston plate moves upward to squeeze the air, the one-way valve in the ventilation pipe opens, and the air is transported to the nozzle for spraying, thereby achieving the purpose of cooling the rolling mill.

[0021] 2. The utility model provides a hot forging die for a rolling mill. A rounded corner is provided at the connection between the shell and the fixed groove so that the movement amplitude of the first die can be reduced when the control component stretches the first die. This can prevent the rolling mill from popping out due to excessive movement of the first die, thereby achieving the purpose of better protecting the staff.

[0022] 3. The utility model provides a hot forging die for a rolling mill. Since the pressure applied by the die-casting device to the die during die-casting is very large, the reset spring can be better protected by setting the height of the fixed block to be greater than the minimum contraction length of the reset spring, thereby extending the service life of the reset spring and improving the working efficiency of the device.

[0023] 4. The utility model provides a hot forging die for a rolling mill. In the environment of a die-casting rolling mill, the air contains some large dust particles, which may cause the particles to block the nozzle during operation, which not only reduces the work efficiency but also may cause harm to the staff. By setting a filter, the dust and particles can be effectively isolated from the outside, greatly improving the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0027] Figure 3 It is a schematic diagram of the oblique section structure of the utility model;

[0028] Figure 4 It is a partial structural schematic diagram of the utility model;

[0029] Figure 5 This is a schematic diagram of the control component structure of the utility model;

[0030] In the figure: 1. shell; 2. die-casting device; 3. fixing groove; 4. first mold; 5. second mold; 6. rotating shaft; 7. support plate; 8. reset spring; 9. support shaft; 10. support rod; 11. nozzle; 12. baffle; 13. first connecting rod; 14. second connecting rod; 15. first pressure plate; 16. second pressure plate; 17. pressure spring; 18. protective shell; 19. fixing rod; 20. support rod; 21. piston plate; 22. cylinder body; 23. elastic spring; 24. fixing plate; 25. fillet; 26. fixing block. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the embodiments:

[0032] Example 1

[0033] like Figure 2 As shown, the utility model provides a hot forging die for a rolling mill, comprising a shell 1; characterized in that: a die-casting device 2 is arranged above the shell 1, the die-casting device 2 is fixedly connected to the shell 1, a fixed groove 3 is opened on the shell 1, a first die 4 and a second die 5 are slidably connected in the fixed groove 3, one end of the first die 4 and the second die 5 are rotatably connected through a rotating shaft 6, a support plate 7 is slidably connected inside the fixed groove 3, a return spring 8 is fixedly connected to the end of the support plate 7 away from the first die 4, the other end of the return spring 8 is fixedly connected to the shell 1, a support shaft 9 is slidably connected on the support plate 7, the support shaft 9 is slidably connected to the shell 1, one end of the support shaft 9 is connected to a cooling component for cooling the rolling mill, a control component for controlling the positions of the first die 4 and the second die 5 is connected to the upper surface of the shell 1, a support rod 10 is fixedly connected to the shell 1, and a plurality of nozzles 11 are evenly arranged on the support rod 10.

[0034] In this embodiment, when it is necessary to produce a rolling mill roll using a hot forging die, the material is placed in the open die and then the die-casting device 2 is started. The die-casting device 2 pushes the material into the first die 4 and the second die 5 and continuously extrudes the material. At this time, the first die 4 and the second die 5 collide with each other and move downward. The first die 4 and the second die 5 move downward and squeeze the support plate 7 to shrink the return spring 8. At this time, the movement of the first pressure plate 15 and the second pressure plate 16 will also drive the cooling component and the control component to work. After the die-casting is completed, the die-casting device 2 returns to its original position, and the first die 4 and the second die 5 move in opposite directions under the action of the return spring 8. When the return spring 8 returns to its original position, the first die 4 is tilted open under the action of the control component, so as to facilitate the staff to take and put. At the same time, the cooling component also starts to work to cool the die-cast rolling mill roll.

[0035] like Figure 5 As shown, in the present embodiment, preferably, the control component includes a baffle 12, the baffle 12 is fixedly connected to the shell 1, a first connecting rod 13 and a second connecting rod 14 are provided at one end of the baffle 12, the first connecting rod 13 is hinged to the baffle 12, a first pressure plate 15 is fixedly connected to the side of the first connecting rod 13 away from the baffle 12, a pressure spring 17 is fixedly connected to the side of the first pressure plate 15 close to the baffle 12, the second connecting rod 14 is rotatably connected to one end of the first mold 4 close to the die-casting device 2, a second pressure plate 16 is fixedly connected to the other end of the second connecting rod 14, the other end of the pressure spring 17 is fixedly connected to the second pressure plate 16, the second connecting rod 14 is slidably connected to the first pressure plate 15, the first connecting rod 13 is slidably connected to the second pressure plate 16, a protective shell 18 is slidably connected to the outer side of the first pressure plate 15, and the second pressure plate 16 is slidably connected to the protective shell 18.

[0036] When the die-casting device 2 is performing die-casting, the distance between the first mold 4 and the baffle 12 is the shortest, and the distance between the first pressure plate 15 and the second pressure plate 16 is the shortest, and the pressure spring 17 is in a compressed state. When the die-casting device 2 is completed, the first mold 4 moves upward under the action of the reset spring 8, and the pressure spring 17 will rebound, so that the distance between the first pressure plate 15 and the second pressure plate 16 will be extended. At this time, the first mold 4 will gradually tilt due to the pulling force of the pressure spring 17, thereby exposing the roller that has just been die-cast.

[0037] like Figure 2As shown, preferably, the cooling component includes a fixed rod 19, which is fixedly connected to the other end of the support shaft 9, and a support rod 20 is fixedly connected to the fixed rod 19, and the support rod 20 is symmetrically arranged, and a piston plate 21 is fixedly connected to the other end of the support rod 20, and a cylinder body 22 is slidably connected to the outer side of the piston plate 21, and an air intake pipe and a ventilation pipe are respectively opened on both sides of the cylinder body 22, and the other end of the ventilation pipe is connected to the nozzle 11, and a one-way valve is fixedly connected in the air intake pipe and the ventilation pipe, and a fixed plate 24 is fixedly connected to the support rod 20, and an elastic spring 23 is fixedly connected to one end of the fixed plate 24, and the other end of the elastic spring 23 is fixedly connected to the shell 1, and the fixed plate 24 is slidably connected to the shell 1.

[0038] When the die-casting device 2 die-casts the material, the first mold 4 and the second mold 5 will push the support shaft 9 to move downward, the reset spring 8 is in a compressed state, and the support shaft 9 will drive the support rod 20 to move downward through the fixed rod 19, thereby driving the piston plate 21 to move. The elastic spring 23 is in a compressed state. The movement of the piston plate 21 will cause a pressure difference between the inside and outside of the cylinder body 22, and air enters through the intake pipe and the one-way valve. When the die-casting device 2 completes die-casting, the first mold 4 and the second mold 5 move upward under the action of the reset spring 8 and the elastic spring 23. At this time, the piston plate 21 moves upward, squeezing the air, and the one-way valve in the ventilation pipe opens. The air will be transported to the nozzle 11 and sprayed out, thereby achieving the purpose of cooling the roller.

[0039] Example 2

[0040] like Figure 1 As shown, based on Example 1, the utility model provides a technical solution: preferably, the connection between the shell 1 and the fixing groove 3 is set to a rounded corner 25.

[0041] In this embodiment, a rounded corner 25 is provided at the connection between the shell 1 and the fixed groove 3 so that the movement amplitude of the first mold 4 can be reduced when the control component stretches the first mold 4. This can prevent the roller from popping out due to excessive movement of the first mold 4, thereby achieving the purpose of better protecting the staff.

[0042] Example 3

[0043] like Figure 2 As shown, based on Example 2, the utility model provides a technical solution: preferably, a fixing block 26 is fixedly connected and provided inside the housing 1 , and the height of the fixing block 26 is greater than the minimum contraction length of the reset spring 8 .

[0044] In this embodiment, because the pressure applied by the die-casting device 2 to the mold during die-casting is very large, by setting the height of the fixed block 26 to be greater than the minimum contraction length of the return spring 8, the return spring 8 can be better protected, the service life of the return spring 8 can be extended, and the working efficiency of the device can be improved.

[0045] Example 4

[0046] like Figure 1 As shown, based on Example 3, the utility model provides a technical solution: preferably, a filter is fixedly connected in the air intake duct.

[0047] In this embodiment, because the air in the environment of the die-casting roller contains some large particles of dust, the particles may block the nozzle during operation, which not only reduces the work efficiency but also may cause harm to the staff. By setting a filter, the dust and particles can be effectively isolated outside, greatly improving the working efficiency of the device.

[0048] The following is a detailed description of the working principle of the hot forging die for the rolling mill.

[0049] like Figure 1-5As shown, when it is necessary to produce a rolling mill roll with a hot forging die, the material is placed in the open die, and then the die-casting device 2 is started. The die-casting device 2 will push the material into the first die 4 and the second die 5 and continuously extrude it. At this time, the first die 4 and the second die 5 collide with each other and move downward. The first die 4 and the second die 5 move downward and squeeze the support plate 7 to shrink the reset spring 8. At this time, the movement of the first pressure plate 15 and the second pressure plate 16 will also drive the cooling component and the control component to work. After the die-casting is completed, the die-casting device 2 returns to its original position, and the first die 4 and the second die 5 move in the opposite direction under the action of the reset spring 8. When the reset spring 8 returns to its original position, the first die 4 is tilted open under the action of the control component, so as to facilitate the staff to take and put. At the same time, the cooling component also starts to work to cool the die-cast rolling mill roll. When the die-casting device 2 is performing die-casting, the distance between the first mold 4 and the baffle 12 is the shortest, and the distance between the first pressure plate 15 and the second pressure plate 16 is the shortest, and the pressure spring 17 is in a compressed state. When the die-casting device 2 is completed, the first mold 4 moves upward under the action of the reset spring 8, and the pressure spring 17 will rebound, so that the distance between the first pressure plate 15 and the second pressure plate 16 will be extended. At this time, the first mold 4 will gradually tilt due to the pulling force of the pressure spring 17, thereby exposing the roller that has just been die-cast. When the die-casting device 2 performs die-casting on the material, the first mold 4 and the second mold 5 will push the support shaft 9 to move downward, the reset spring 8 is in a compressed state, the support shaft 9 will drive the support rod 20 to move downward through the fixed rod 19, thereby driving the piston plate 21 to move, the elastic spring 23 is in a compressed state, and the movement of the piston plate 21 will cause a pressure difference between the inside and outside of the cylinder 22, and air enters through the intake pipe and the one-way valve. When the die-casting device 2 is completed, the first mold 4 and the second mold 5 move upward under the action of the reset spring 8 and the elastic spring 23. At this time, the piston plate 21 moves upward, squeezing the air, and the one-way valve in the ventilation pipe opens. The air will be transported to the nozzle 11 and sprayed out to achieve the purpose of cooling the roller. The fillet 25 is provided at the connection between the housing 1 and the fixed groove 3 so that the control component can reduce the movement amplitude of the first mold 4 when stretching the first mold 4, so as to prevent the roller from popping out due to the excessive movement of the first mold 4, thereby achieving the purpose of better protecting the staff. Because the pressure applied by the die-casting device 2 to the mold during die-casting is very large, by setting the height of the fixing block 26 to be greater than the minimum contraction length of the return spring 8, the return spring 8 can be better protected, the service life of the return spring 8 can be extended, and the working efficiency of the device can be improved. Because in the environment of the die-casting roller, the air contains some large dust particles, which may cause the particles to block the nozzle during work, which not only reduces the working efficiency but also may cause harm to the staff. By setting the filter, the dust and particles can be effectively isolated from the outside, greatly improving the working efficiency of the device.

[0050] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A hot forging die for a rolling mill, comprising a housing (1); characterized in that: A die-casting device (2) is arranged above the housing (1), and the die-casting device (2) is fixedly connected to the housing (1). A fixing groove (3) is provided on the housing (1), and a first mold (4) and a second mold (5) are slidably connected in the fixing groove (3). One end of the first mold (4) and the second mold (5) are rotatably connected via a rotating shaft (6). A support plate (7) is slidably connected in the fixing groove (3), and a return spring (8) is fixedly connected to the end of the support plate (7) away from the first mold (4). The other end of the return spring (8) is fixedly connected to the shell (1); a support shaft (9) is slidably connected to the support plate (7); the support shaft (9) is slidably connected to the shell (1); one end of the support shaft (9) is connected to a cooling component for cooling the roller; a control component for controlling the positions of the first mold (4) and the second mold (5) is connected to the upper surface of the shell (1); a support rod (10) is fixedly connected to the shell (1); and a plurality of nozzles (11) are evenly arranged on the support rod (10).

2. The hot forging die for a roll according to claim 1, characterized in that: The control component comprises a baffle (12), wherein the baffle (12) is fixedly connected to the housing (1), a first connecting rod (13) and a second connecting rod (14) are arranged at one end of the baffle (12), the first connecting rod (13) is hinged to the baffle (12), a first pressing plate (15) is fixedly connected to a side of the first connecting rod (13) away from the baffle (12), a pressure spring (17) is fixedly connected to a side of the first pressing plate (15) close to the baffle (12), the second connecting rod (14) is connected to the first mold (11), and the first pressing plate (15) is fixedly connected to the first mold (11). 4) One end of the second connecting rod (14) is rotatably connected to the die-casting device (2), the other end of the second connecting rod (14) is fixedly connected to the second pressure plate (16), the other end of the pressure spring (17) is fixedly connected to the second pressure plate (16), the second connecting rod (14) is slidably connected to the first pressure plate (15), the first connecting rod (13) is slidably connected to the second pressure plate (16), the outer side of the first pressure plate (15) is slidably connected to a protective shell (18), and the second pressure plate (16) is slidably connected to the protective shell (18).

3. A hot forging die for a roll according to claim 2, characterized in that: The cooling component comprises a fixed rod (19), wherein the fixed rod (19) is fixedly connected to the other end of the support shaft (9), a support rod (20) is fixedly connected to the fixed rod (19), the support rod (20) is symmetrically arranged, the other end of the support rod (20) is fixedly connected to a piston plate (21), the outer side of the piston plate (21) is slidably connected to a cylinder body (22), an air intake pipe and a ventilation pipe are respectively provided on both sides of the cylinder body (22), the other end of the ventilation pipe is connected to the nozzle (11), and a one-way valve is fixedly connected to the air intake pipe and the ventilation pipe, a fixed plate (24) is fixedly connected to the support rod (20), one end of the fixed plate (24) is fixedly connected to an elastic spring (23), the other end of the elastic spring (23) is fixedly connected to the shell (1), and the fixed plate (24) is slidably connected to the shell (1).

4. A hot forging die for a roll according to claim 3, characterized in that: The connection between the housing (1) and the fixing groove (3) is arranged as a rounded corner (25).

5. The hot forging die for a roll according to claim 4, characterized in that: A fixing block (26) is fixedly connected inside the housing (1), and the height of the fixing block (26) is greater than the minimum contraction length of the return spring (8).

6. The hot forging die for a roll according to claim 3, characterized in that: A filter is fixedly connected in the air intake pipe.

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