Ball mill

Abstract

The invention relates to the technical field of material crushing, in particular to a ball mill which is characterized in that a shell cover is further arranged outside a body, the shell cover is connected with a feeding hopper and a rotating shaft through bearings, the two sides of the shell cover are fixedly connected with the side faces of bearing seats through fixing rings, a water inlet pipe is arranged at the upper end of the shell cover in a penetrating mode, and a water outlet pipe is arranged at the lower end of the shell cover. An axially-arranged spraying pipe is fixedly hoisted in the shell cover through a fixing ring, the water inlet pipe is communicated with the spraying pipe, and a plurality of spraying heads are evenly arranged below the spraying pipe. The ball mill can be cooled under the condition of no shutdown, the phenomenon of paste milling in the ball mill is prevented, and the service life of the ball mill is prolonged. And cooling is carried out in a mode of combining air cooling and liquid cooling, so that the cooling efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of material crushing, and in particular to a ball mill. Background Art

[0002] A ball mill is a device that uses grinding media (such as steel balls) to impact, grind and shear materials in a cylinder. When the mill rotates, the grinding body adheres to the liner of the inner wall of the mill due to the inertial centrifugal force and rotates with the mill and is brought to a certain height, then falls, strongly impacting and grinding the materials in the cylinder, thereby crushing the materials to the required fineness; With the rapid development of my country's economy, the expansion of cities and the renovation of old urban areas require a large amount of building materials. Of course, in the process of development and renovation, various construction wastes (such as cement blocks, bricks and decoration materials) will also be generated. These construction wastes were filled into the ground in the past, which would cause environmental pollution and prevent the construction waste from being reused. Of course, the above construction waste can be used to make various building materials, such as cement, concrete, etc. after being processed by a ball mill; However, when the ball mill is working, the collision and friction between the steel balls and the materials will generate a lot of heat, and the materials being milled will easily adhere to the inner wall of the drum due to the heat. However, there are many types of construction waste being ground, and the moisture content varies greatly. Some may have a high moisture content, while others may have a relatively low moisture content. Many of the waste materials with recycling value contain more or less moisture. The moisture in the material turns into water vapor due to the increase in temperature during grinding; in a high temperature and high humidity environment, it is very easy to produce paste grinding in the ball mill (in a high temperature and high humidity environment, under the combined action of moisture and static electricity, fine particles of material are adsorbed on the inner wall of the ball mill, the compartment, the surface of the grate plate, and the surface of the grinding body, which is called paste grinding). Without changing the working conditions, paste grinding will become more and more serious over time. Therefore, it is necessary to cool the ball mill during operation to suppress the adverse effects of paste grinding on ball milling; however, the natural cooling of the ball mill takes a lot of time, about 4 hours, which greatly affects the progress of maintenance. Summary of the invention

[0003] According to the problems raised in the background technology, the present invention provides a ball mill to solve the problems. The present invention will be further explained below.

[0004] A ball mill comprises a base fixedly arranged on the left and right, a bearing seat is fixedly arranged on the base, and a ball mill body is arranged between the two bearing seats; a feed pipe is integrally arranged at the axis center on the right side of the body, the feed pipe is supported on the bearing seat and connected with the feed hopper, a rotating shaft is fixedly arranged on the left side of the body through a fixed seat, the rotating shaft is connected with the bearing of the bearing seat, and a gear is fixedly arranged at the end of the rotating shaft, and the rear end of the gear is meshed and connected with a driving gear; An outer shell cover is also provided outside the body, the outer shell cover is connected to the feed hopper and the rotating shaft through bearings, and is fixedly connected to the side surfaces of the bearing seat through fixing rings on both sides of the outer shell cover, a water inlet pipe is passed through the upper end of the outer shell cover, an axially arranged spray pipe is fixedly hoisted inside the outer shell cover through a fixing ring, the water inlet pipe is communicated with the spray pipe, and a plurality of spray heads are evenly arranged below the spray pipe; Preferably, the outer shell is provided with heat-insulating cotton inside; the bottom of the shower head is also provided with a disc, and the bottom of the disc is concave; Preferably, an air outlet pipe is obliquely provided on one side of the upper end of the outer shell; an air inlet pipe is also obliquely provided on one side of the bottom of the outer shell, the air inlet pipe is externally connected to a fan, and the inclination angle of the air inlet pipe and the air outlet pipe are consistent; a drainage groove is provided on the outer surface of the body; Preferably, two water collecting tanks are provided at the bottom of the outer shell, and a U-shaped flow guide pipe is provided inside the water collecting tank. The U-shaped flow guide pipe is located below the body, one end of which passes through the bottom of the water collecting tank to the outside of the outer shell, and the other end is close to the bottom of the water collecting tank; Preferably, a discharge port is provided at the bottom of the main body, a valve is provided in the discharge port, and a discharge pipe is provided at the bottom of the outer shell, and the diameter of the discharge pipe is larger than the discharge port; Preferably, a circular ring block is provided on the side of the discharge port, and two slide grooves are provided at the bottom of the outer shell cover, and an L-shaped slider is slidably connected inside the slide groove, and the end plate of the L-shaped slider is a semicircular arc plate, and the shape of the bottom of the short end and the bottom of the long end of the L-shaped slider fits the shape of the bottom of the outer shell cover; Preferably, a latch rod is fixedly provided at the lower end of the L-shaped slider, and a groove for facilitating the sliding of the latch rod is also provided at the bottom of the outer shell; Preferably, a stepped mounting groove is provided at the upper end of the groove, a rotating disc is slidably connected inside the mounting groove, two arc-shaped grooves are radially provided on the rotating disc, the latch rod passes through the arc-shaped grooves, an electric cylinder is provided on one side of the bottom fixed of the outer shell cover, and the output end of the electric cylinder is fixedly connected to the side of the latch rod; Preferably, a flow block is further provided on the side of the circular ring block, the flow block is fixedly connected to the body and is located on both sides of the L-shaped slider, the flow block is in a circular ring shape, and the height of the flow block is greater than the height of the circular ring block; Preferably, a plurality of reinforcing ribs are evenly arranged on the side of the body, an explosion-proof plate is arranged between two adjacent reinforcing ribs, a partition is arranged inside the body, the diameter of the partition is smaller than the diameter inside the body, and the partition is fixedly connected to the reinforcing ribs on the side through a support rod; Beneficial effect: Compared with the prior art, the present invention can cool the ball mill without stopping the machine, thereby preventing the ball mill from being stuck inside. The invention also cools the ball mill by combining air cooling and liquid cooling, and has high cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 : Schematic diagram of the structure of the present invention; Figure 2 : A schematic diagram of the structure enlargement of the present invention; Figure 3 : A top view of the L-shaped slider of the present invention; Figure 4 : A schematic diagram of the enlarged structure of the B direction of the present invention; Figure 5 : A top view of the rotating disc of the present invention; In the figure: base 1, bearing seat 2, body 3, feed hopper 4, fixed seat 5, rotating shaft 6, gear 7, outer shell cover 8, water inlet pipe 9, spray pipe 10, spray head 11, air outlet pipe 12, air inlet pipe 13, water collecting tank 14, U-shaped guide pipe 15, discharge port 16, valve 17, discharge pipe 18, groove 19, circular ring block 20, L-shaped slider 21, latch rod 22, electric cylinder 23, feed pipe 24, partition 25, baffle block 26, reinforcing rib 27, explosion-proof disk 28, support rod 29, mounting groove 30, rotating disc 31, arc groove 32; DETAILED DESCRIPTION

[0006] Next, combine with Figure 1-5 A specific embodiment of the present invention is described in detail.

[0007] A ball mill, such as the attached Figure 1 As shown, it includes a base 1 fixedly arranged on the left and right, a bearing seat 2 is fixedly arranged on the base 1, and a ball mill body 3 is arranged between the two bearing seats 2. A feed pipe 24 is integrally arranged at the right axis of the body 3, and the feed pipe 24 is supported on the bearing seat 2 and connected with the feed hopper 4. The construction waste to be ball-milled enters the feed pipe 24 from the feed hopper 4 and finally enters the ball mill body 3. A spiral feeding device is often arranged in the feed pipe 24 to feed the construction waste into the ball mill body 3 in the form of spiral stirring.

[0008] A rotating shaft 6 is fixedly arranged on the left side of the body 3 through a fixing seat 5, and the rotating shaft 6 is bearing-connected to the bearing seat 2, and a gear 7 is fixedly arranged at the end of the rotating shaft 6, and the rear end of the gear 7 is meshed with a driving gear (not shown in the figure), and the driving gear is connected to the output shaft of the driving motor, and the ball mill body is driven to rotate by the driving motor. The meshing of the rear end of the gear 7 with the driving gear actually constitutes a deceleration system, which drives the ball mill body to rotate slowly.

[0009] After the construction waste is initially processed, it enters the body 3 through the feed hopper 4, and then the drive gear is started to drive the gear 7 to rotate, so that the steel ball inside the body 3 grinds the incoming material inside the body. The horizontal rotation of the body drives the internal grinding body (usually a steel ball) to move. When the grinding body is brought to a certain height, it is thrown down due to gravity. The falling grinding body crushes the material in the body like a projectile. In addition, during the rotation of the body, the grinding body also slides down, and the material is ground during the sliding process. Through such impact and grinding, the construction waste is gradually crushed, and the crushed construction waste is discharged from the cylinder through the discharge part, thereby completing the crushing ball milling operation.

[0010] According to the background technology, when the ball mill is working, the collision and friction between the steel ball and the material will generate a lot of heat, and the material being ball-milled is easily adhered to the inner wall of the drum due to the heat. However, there are many types of construction waste being ground, and the moisture content varies greatly. Some may have a high moisture content, while others are relatively low. Many of the waste materials with recycling value contain more or less moisture. The moisture in the material turns into water vapor due to the increase in temperature during grinding; in a high temperature and high humidity environment, it is very easy to produce paste grinding in the ball mill (in a high temperature and high humidity environment, under the combined action of moisture and static electricity, fine particle materials are adsorbed on the inner wall of the ball mill, the compartment, the surface of the grate plate of the warehouse, and the surface of the grinding body, which is called paste grinding). Without changing the working conditions, paste grinding will become more and more serious over time, so it is necessary to cool the ball mill during operation to suppress the adverse effects of paste grinding on ball milling.

[0011] Based on the above situation, the present application adopts the following measures: an outer shell cover 8 is further provided on the outside of the body 3, the outer shell cover 8 is connected to the feed hopper 4 and the rotating shaft 6 through bearings, and is fixedly connected to the side of the bearing seat 2 through fixing rings on both sides of the outer shell cover 8, and a water inlet pipe 9 is provided through the upper end of the outer shell cover 8, and an axially arranged spray pipe 10 is fixedly hoisted inside the outer shell cover 8 through a fixing ring, the water inlet pipe 9 is connected to the spray pipe 10, and a plurality of spray heads 11 are evenly provided below the spray pipe 10. That is, when the body 3 rotates and works, the spray head 11 is turned on, and the coolant sprayed by the spray head 11 will cool the outside of the body 3, and the coolant is preferably water.

[0012] It should be noted that the outer shell cover 8 is provided with heat insulation cotton, which is mainly used for heat insulation treatment, especially in an open-air high-temperature working environment. At the same time, it has a certain silencing effect on the noise caused by severe impact and friction when the ball mill is working.

[0013] The water flow sprayed by the spray head 11 generally directly hits the top surface of the body 3. Under the initial velocity of the spray and the gravity acceleration between the free fall to the top surface of the body 3, the water body directly hitting the top surface of the body 3 has great kinetic energy and splashes, affecting the efficiency of contact and cooling with the surface of the body 3. Based on this, in this embodiment, a disc is also provided at the bottom of the spray head 11, and the bottom of the disc is concave; through the above arrangement, the coolant of the spray head 11 will first contact the center of the disc, and then spray around, thereby reducing the kinetic energy of the outflowing fluid. More importantly, the fluid diffused around forms a water curtain, which expands the area directly in contact with the surface of the body and accelerates the cooling rate of the body.

[0014] An air outlet pipe 12 is obliquely provided on one side of the upper end of the outer shell cover 8; In conventional cooling methods, increasing the water flow rate sprayed by the sprinkler head 11 is a way to enhance the cooling effect, but the effect of increasing the cooling fluid decreases significantly after a certain amount of water. In order to further enhance the cooling effect, this embodiment achieves this by intensifying the phase change of the volatilization of the cooling fluid without increasing the cooling fluid. Specifically, an air inlet pipe 13 is also inclined on one side of the bottom of the outer shell cover 8, and the air inlet pipe 13 is externally connected to a fan. The inclination angle of the air inlet pipe 13 is consistent with that of the air outlet pipe 12. Preferably, the inclination angle of the air inlet pipe 13 and the air outlet pipe 12 is 135 degrees, that is, after the wind of the air inlet pipe 13 enters the cavity between the outer shell cover 8 and the main body 3, the cooling wind will spiral around the main body 3 and then be discharged from the air outlet pipe 12.

[0015] Furthermore, a drainage groove is provided on the outer surface of the body 3, so that the cooling fluid can flow along the drainage groove on the surface of the body 3 and can flow along the drainage groove to the side of the body facing away from the spray head 11, thereby increasing the contact time with the outer surface of the body 3 and enhancing the cooling effect. At the same time, when the cooling air passes through the drainage groove, a small range of turbulence can be formed on the outer surface of the body 3, and the air flow intensifies the volatilization of the cooling fluid. When the cooling fluid volatilizes, it absorbs energy from the environment, thereby further enhancing the cooling effect on the body.

[0016] This application adopts the method of spraying coolant through the spray head 11. As time goes by, the coolant will accumulate at the bottom of the cavity between the outer shell 8 and the body 3. When the liquid height of the accumulated liquid gradually increases and contacts the bottom of the body 3, the lower space flow channel of the cooling wind is blocked, and the weight of the whole device also increases dramatically, which poses a safety hazard. Therefore, it is necessary to discharge the coolant inside the cavity between the outer shell 8 and the body 3. The scheme of this embodiment is as follows: two water collecting tanks 14 are provided at the bottom of the outer shell, and a U-shaped guide pipe 15 is also provided inside the water collecting tank 14. The U-shaped guide pipe 15 is located below the body 3, one end of which passes through the bottom of the water collecting tank 14 to the outside of the outer shell 8, and the other end is close to the bottom of the water collecting tank 14. When the coolant enters the water collecting tank 14 and accumulates, the water level in the water collecting tank 14 gradually increases. When the level is above the top of the U-shaped guide pipe 15, the coolant will flow outward under the drainage of the U-shaped guide pipe 15, and continue to flow outward under the principle of siphon until the level of the water accumulated in the water collecting tank 14 is lower than the inlet of the U-shaped guide pipe, and the accumulated water is automatically discharged outward in this way. Of course, the U-shaped guide pipe 15 can be connected to an external heat exchange device, and after cooling, it can be connected to the water inlet pipe 9 through a pipeline to achieve the recycling of water resources.

[0017] As attached Figure 2 As described, when the main body 3 has finished grinding the incoming material, it is necessary to discharge the ground material inside the main body 3. A discharge port 16 is provided at the bottom of the main body 3. A valve 17 is provided in the discharge port 16. The valve 17 is opened and closed by an external controller. This technology is prior art and will not be elaborated on here. A discharge pipe 18 is provided at the bottom of the outer shell 8. The diameter of the discharge pipe 18 is larger than the discharge port 16. It should be noted that the discharge pipe 18 can be connected to an external pipeline to deliver the ground material to the material collection device. In this example, the diameter of the discharge pipe 18 is twice the diameter of the discharge port 16. That is, after the grinding is completed, the rotation of the driving gear is controlled so that the discharge port 16 is above the discharge pipe 18, and then the valve 17 is opened, and the ground material can enter the discharge pipe 18 from the discharge port 16; that is, when the discharge port 16 is above the discharge pipe 18, the valve 17 can be opened.

[0018] As attached Figure 3 As shown, in the present application, the method adopted is to cool the ball mill by liquid cooling and air cooling. However, after the grinding is completed, the coolant will still adhere to the surface of the ball mill. If it is not dried, the rust on the surface of the ball mill will be aggravated if it is idle for a long time. In addition, during the material discharge process, since there is a gap between the discharge pipe 18 and the discharge port 16 facing each other, the discharged material contains a lot of dust. The leaked dust material will adhere to the outer surface of the body 3 and the inner surface of the outer shell cover 8 under the action of the coolant.

[0019] Of course, the above problem can be solved by drying the coolant on the surface of the ball mill before discharging, but this affects the working efficiency of the ball mill. Based on the above reasons, the present application adopts the following solution: a circular ring block 20 is provided on the side of the discharge port 16, and two slide grooves are provided at the bottom of the outer shell cover 8. The inside of the slide groove is slidably connected to an L-shaped slider 21. It should be noted that the end plate of the L-shaped slider 21 is a semi-circular arc plate, and the shape of the bottom of the short end and the bottom of the long end of the L-shaped slider 21 fits the shape of the bottom of the outer shell cover 8, that is, the two L-shaped sliders 21 form a circular channel; by controlling the two L-shaped sliders 21 to press against the circular ring block 20, the material is collected; In this embodiment, a latch rod 22 is fixedly provided at the lower end of the L-shaped slider 21, and a groove 19 is also provided at the bottom of the outer shell 8 for facilitating the sliding of the latch rod 22; that is, the sliding of the two latch rods 22 can make the L-shaped slider 21 abut against the annular block 20; of course, many measures are needed to make the two latch rods 22 slide, for example: two electric cylinders 23 are provided at the bottom of the outer shell 8, and the output ends of the two electric cylinders 23 are fixed on both sides of the L-shaped slider 21, and the sliding of the L-shaped slider 21 can be completed by controlling the extension and contraction of the electric cylinders 23; As mentioned above, the sliding of the L-shaped slider 21 can be completed by controlling the extension and retraction of the electric cylinder 23. The applicant believes that the use of two electric cylinders 23 will lead to an increase in enterprise costs. Based on this, the present application adopts the following replacement scheme, that is, a stepped mounting groove 30 is provided at the upper end of the groove 19, and a rotating disc 31 is slidably connected inside the mounting groove 30. The rotating disc 31 is radially provided with two arc-shaped grooves 32, and the latch rod 22 passes through the arc-shaped grooves 32. The bottom fixed side of the outer shell cover 8 is provided with an electric cylinder 23, and the output end of the electric cylinder 23 is fixedly connected to the side of the latch rod 22; That is, by controlling the electric cylinder 23, the latch rod 22 is moved, so that the rotating disc 31 rotates, and then the latch rod 22 on the other side is moved. It should be noted that when the material needs to be discharged, the electric cylinder 23 is controlled to move the latch rod 22 forward, so that the L-shaped sliders 21 on both sides abut against the annular block 20, and then the valve is opened. When the ball mill is grinding, the electric cylinder 23 is controlled to move the latch rod 22 backward, so that the two L-shaped sliders 21 are separated; Of course, when the ball mill is grinding, some coolant may enter the discharge pipe. Based on this, a baffle block 26 is further provided on the side of the annular block 20. The baffle block 26 is fixedly connected to the body 3 and is located on both sides of the L-shaped slider 21. The baffle block 26 is annular, and the height of the baffle block 26 is greater than the height of the annular block 20. As attached Figure 4 As shown, a plurality of reinforcing ribs 27 are evenly arranged on the side of the main body 3, and an explosion-proof plate 28 is arranged between two adjacent reinforcing ribs 27. The combustible properties of the internal material change after being powdered, and there is a risk of explosion. The setting of the explosion-proof plate 28 is to provide a safety protection for the ball mill, and the pressure is released outward through its rupture to protect the main body.

[0020] A partition 25 is provided inside the body 3, and the diameter of the partition 25 is smaller than the diameter inside the body 3. The partition 25 is fixedly connected to the side reinforcing rib 27 through a support rod 29. The partition 25 can be provided to prevent the grinding materials accumulated inside and the grinding balls from directly hitting or accumulating on the surface of the explosion-proof plate, thereby preventing the explosion-proof plate from rupturing accidentally due to excessive local pressure.

[0021] Compared with the prior art, the present invention can cool the ball mill without stopping the machine, thereby preventing the ball mill from being stuck inside the ball mill, and cools the ball mill by combining air cooling and liquid cooling, with high cooling efficiency. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ball mill, comprising a base (1) fixedly arranged on the left and right, a bearing seat (2) fixedly arranged on each of the bases (1), and a ball mill body (3) arranged between the two bearing seats (2); a feed pipe (24) is integrally arranged at the right axis of the body (3), the feed pipe (24) is supported on the bearing seat (2) and connected to the feed hopper (4); a rotating shaft (6) is fixedly arranged on the left side of the body (3) through a fixed seat (5), the rotating shaft (6) is connected to the bearing of the bearing seat (2), and a gear (7) is fixedly arranged at the end of the rotating shaft (6), and the rear end of the gear (7) is meshed with a driving gear; Features: An outer shell cover (8) is also provided outside the body (3). The outer shell cover (8) is connected to the feed hopper (4) and the rotating shaft (6) via bearings, and is fixedly connected to the side surfaces of the bearing seat (2) via fixing rings on both sides of the outer shell cover (8). A water inlet pipe (9) is provided through the upper end of the outer shell cover (8). An axially arranged spray pipe (10) is fixedly suspended inside the outer shell cover (8) via a fixing ring. The water inlet pipe (9) is connected to the spray pipe (10), and a plurality of spray heads (11) are evenly provided below the spray pipe (10).

2. A ball mill according to claim 1, characterized in that: The outer shell (8) is provided with heat insulation cotton inside; the bottom of the shower head (11) is also provided with a disc, and the bottom of the disc is concave.

3. A ball mill according to claim 2, characterized in that: An air outlet pipe (12) is obliquely provided on one side of the upper end of the outer shell cover (8); an air inlet pipe (13) is also obliquely provided on one side of the bottom of the outer shell cover (8); the air inlet pipe (13) is externally connected to a fan, and the inclination angle of the air inlet pipe (13) and the air outlet pipe (12) are consistent; and a drainage groove is provided on the outer surface of the main body (3).

4. A ball mill according to claim 3, characterized in that: Two water collecting grooves (14) are provided at the bottom of the outer shell cover. A U-shaped flow guide pipe (15) is also provided inside the water collecting groove (14). The U-shaped flow guide pipe (15) is located below the main body (3). One end of the U-shaped flow guide pipe (15) passes through the bottom of the water collecting groove (14) to the outside of the outer shell cover (8), while the other end is close to the bottom of the water collecting groove (14).

5. A ball mill according to claim 4, characterized in that: A discharge port (16) is provided at the bottom of the body (3), a valve (17) is provided inside the discharge port (16), and a discharge pipe (18) is provided at the bottom of the outer shell (8), the discharge pipe (18) having a diameter greater than that of the discharge port (16).

6. A ball mill according to claim 5, characterized in that: A circular ring block (20) is provided on the side of the discharge port (16), and two slide grooves are provided at the bottom of the outer shell cover (8). An L-shaped slider (21) is slidably connected inside the slide groove. The end plate of the L-shaped slider (21) is a semi-circular arc plate. The shape of the bottom of the short end and the bottom of the long end of the L-shaped slider (21) fits the shape of the bottom of the outer shell cover (8).

7. A ball mill according to claim 6, characterized in that: A latch rod (22) is fixedly provided at the lower end of the L-shaped slide block (21), and a groove (19) is also provided at the bottom of the outer shell cover (8) to facilitate the sliding of the latch rod.

8. A ball mill according to claim 7, characterized in that: A stepped mounting groove (30) is provided at the upper end of the groove (19), a rotating disc (31) is slidably connected inside the mounting groove (30), two arc-shaped grooves (32) are radially provided on the rotating disc (31), the latch rod (22) passes through the arc-shaped grooves (32), an electric cylinder (23) is provided on one side of the bottom of the outer shell cover (8), and an output end of the electric cylinder (23) is fixedly connected to a side of the latch rod (22).

9. A ball mill according to claim 8, characterized in that: A flow block (26) is also provided on the side of the circular ring block (20); the flow block (26) is fixedly connected to the body (3) and is located on both sides of the L-shaped slider (21); the flow block (26) is in the shape of a circular ring; and the height of the flow block (26) is greater than the height of the circular ring block (20).

10. A ball mill according to claim 9, characterized in that: A plurality of reinforcing ribs (27) are evenly arranged on the side of the body (3), an explosion-proof plate (28) is arranged between two adjacent reinforcing ribs (27), a partition (25) is arranged inside the body (3), the diameter of the partition (25) is smaller than the diameter inside the body (3), and the partition (25) is fixedly connected to the reinforcing ribs (27) on the side via a support rod (29).

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