A dust prevention device for green construction sites

Abstract

The present invention discloses a dust-proof device for green construction sites, comprising a base and a mounting assembly. The mounting assembly comprises a first mounting member and a second mounting member. The docking post is inserted into the middle of the inner cylinder, pushing the retaining ring to compress the first spring, keeping the ball head groove in communication with the through hole, and keeping the second spring to push the movable part upward, pushing the limiting ball from the receiving groove into the ball head groove. The dust-proof device for green construction sites pushes the movable part downward, keeping the movable part to compress the second spring, the receiving groove in communication with the through hole, and the limiting ball enters the receiving groove under the guidance of the inclined conical surface, and keeps the first spring to push the retaining ring and the first mounting member upward, so that the first cylinder can be removed from the second cylinder, and the inner wall of the barrel, the filter screen, the motor and the fan blades can be cleaned. Not only can it be quickly disassembled and assembled, but the operation can also be completed without the aid of tools. The difficulty of disassembly and assembly is reduced, time is saved, and cleaning efficiency is improved.

Description

Technical Field

[0001] The present invention relates to dust prevention technology, in particular to a dust prevention device for green construction sites. Background Art

[0002] Mist cannons are professional dust suppression equipment used to control industrial and mining dust, and are very effective in controlling dust and fog burial at construction sites. Therefore, they are also called dust removal mist cannons. Before demolition and transportation operations begin, spray dust suppression should be carried out. During the construction process, regular spraying and road cleaning should also be carried out to prevent the occurrence of large amounts of dust and prevent water accumulation on the ground. Strictly following construction requirements will significantly reduce the pollution caused by construction site dust to the atmosphere and play an important role in building green construction sites. A mist cannon is the main high-altitude dust control device. The principle of the mist cannon is to allow high-pressure water to flow through the atomizing hole and then be sprayed out. Under the blowing of the fan, the atomized water comes into contact with the dust in the air, increasing the weight of the dust and causing it to fall, thereby achieving the purpose of effective dust control.

[0003] Most current atomizer cannons utilize a two-stage structure, such as the one disclosed in CN218306991U. These cannons suffer from poor functionality during use. Due to their specific operating locations, the dust screen, internal motor, and fan blades are easily contaminated with dust, affecting the cannon's proper operation. Disassembly for cleaning requires removing numerous bolts between the two-stage structure, which is inconvenient, requires tools, and is time-consuming and labor-intensive. Furthermore, due to the unique design of the barrel, repairs are difficult to perform in the event of a component failure. Summary of the Invention

[0004] In order to solve the defects of the above-mentioned prior art, the present invention proposes a dust prevention device for green construction sites.

[0005] The technical solution of the present invention is achieved as follows:

[0006] A dust prevention device for a green construction site, comprising:

[0007] A base, wherein a bracket is provided inside the base, a mounting frame is provided on the bracket, a rotating disk is provided on the mounting frame, a fixing frame is provided on the rotating disk, a barrel is provided in the middle of the fixing frame, and the barrel consists of a first barrel body and a second barrel body; and

[0008] A mounting assembly for connecting a first cylinder to a second cylinder, the mounting assembly comprising a first mounting member mounted on the first cylinder and a second mounting member mounted on the second cylinder,

[0009] The first mounting member is composed of a first mounting block and a docking post, and the docking post is provided with a plurality of ball head grooves;

[0010] The second mounting member is composed of a second mounting block and a docking seat, and the docking seat is composed of an inner cylinder and an outer cylinder, a retaining ring is provided in the middle of the inner cylinder, a first spring is provided at the lower end of the retaining ring, a movable gap is formed between the outer cylinder and the inner cylinder, a movable member is provided in the movable gap, the movable member is composed of an inner ring and an outer ring, a positioning area is formed between the inner ring and the outer ring, the outer cylinder is arranged in the positioning area, a second spring is provided in the movable gap, the second spring is at the lower end of the inner ring, a plurality of through holes are provided on the inner cylinder that cooperate with the ball head groove, a plurality of accommodating grooves are provided on the inner ring that cooperate with the through holes, a limiting ball that cooperates with the ball head groove and the accommodating groove is provided in the through hole,

[0011] The docking post is inserted into the middle of the inner cylinder, pushing the retaining ring to compress the first spring, keeping the ball head groove connected to the through hole, keeping the second spring to push the movable part upward, and pushing the limiting ball from the accommodating groove into the ball head groove.

[0012] In the present invention, the elastic force of the first spring is greater than the elastic force of the second spring.

[0013] In the present invention, the docking column consists of a first column, a second column, a third column and a fourth column, the ball head groove is provided on the third column, and the diameters of the first column, the second column, the third column and the fourth column are successively reduced.

[0014] In the present invention, a raised portion is provided in the middle of the inner cylinder, an annular groove is formed in the middle of the raised portion, an annular member is provided in the annular groove, and a raised head cooperating with the annular member is provided at the lower end of the fourth column.

[0015] In the present invention, the retaining ring is composed of a first annular body, a second annular body and a third annular body. The outer diameter of the first annular body matches the inner wall of the inner cylinder. The outer diameter of the first annular body is smaller than the outer diameter of the second annular body. The outer diameter of the third annular body is smaller than the outer diameter of the first annular body. An inner groove is provided in the middle of the inner cylinder. The second annular body is arranged in the inner groove. The lower end of the second annular body contacts the upper end of the first spring.

[0016] In the present invention, a first contact surface is provided on the second annular body, and the upper end of the inner groove forms a second contact surface that matches the first contact surface.

[0017] In the present invention, the inner cylinder is provided with a plurality of dividing grooves, which divide the inner cylinder into a plurality of force-bearing and deformable retaining arms, the retaining arms are provided with a first guide slope, the lower end of the inner ring is provided with an extension portion, the lower end inner wall of the extension portion is provided with a guide block that cooperates with the first guide slope, and the guide block is provided with a second guide slope and a first blocking surface.

[0018] In the present invention, the retaining arm is provided with symmetrically arranged guide grooves, the guide grooves are arranged on both sides of the through hole, the lower end of the guide groove is provided with a deepened groove, and a second blocking surface that cooperates with the first blocking surface is formed between the deepened groove and the guide groove.

[0019] In the present invention, a thickened portion is provided at the lower end of the retaining arm, and a bearing surface is provided on the thickened portion. When the movable member is pressed downward, the extending portion is kept placed on the bearing surface.

[0020] In the present invention, a tapered surface is provided in the through hole, and the diameter of the tapered surface at one end facing the outer cylinder is larger than that at the other end facing the inner cylinder.

[0021] The green construction site dust-proof device of the present invention has the following beneficial effects: by pushing the movable part downward, the movable part is kept compressed by the second spring, the receiving groove is connected to the through hole, and the limiting ball enters the receiving groove under the guidance of the inclined conical surface, and the first spring is kept pushing the retaining ring and the first mounting part upward, so that the first cylinder can be removed from the second cylinder, and the inner wall of the barrel, the filter screen, the motor and the fan blades can be cleaned. Not only can it be quickly disassembled and assembled, but the operation can also be completed without the aid of tools. The difficulty of disassembly and assembly is reduced, time is saved, and cleaning efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a dust prevention device for a green construction site according to the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0024] Figure 3 for Figure 1 Schematic diagram of the installation component structure in;

[0025] Figure 4 for Figure 3 A top view of

[0026] Figure 5 for Figure 4 The cross-sectional view at AA in the figure;

[0027] Figure 6 for Figure 3 Exploded diagram;

[0028] Figure 7 for Figure 6 A schematic structural diagram of the first mounting member in FIG.

[0029] Figure 8 for Figure 6 A perspective view of the structure of the moving parts;

[0030] Figure 9 for Figure 8 sectional view of ;

[0031] Figure 10 for Figure 6 A cross-sectional view of the retaining ring structure;

[0032] Figure 11 for Figure 6 A schematic structural diagram of the second mounting member in FIG.

[0033] Figure 12 for Figure 11 sectional view of ;

[0034] Figure 13 for Figure 11 Schematic diagram of the internal structure;

[0035] Figure 14 for Figure 13 A partial enlarged view of point B in FIG.

[0036] In the figure: base 1, mounting assembly 2, barrel 3, bracket 4, mounting frame 5, rotating disk 6, fixing frame 7, motor 8, pump 9, first cylinder 10, second cylinder 11, mounting portion 12, mounting port 13, bearing seat 14, rotating shaft 15, hydraulic cylinder 16, filter screen 17, first mounting member 18, second mounting member 19, first mounting block 20, docking column 21, ball head groove 22, first column 23, second column 24, third column 25, fourth column 26, second mounting block 27, docking seat 28, inner cylinder 29, outer cylinder 30, retaining ring 31, retaining arm 32, first spring 33, movable gap 34, movable member 35, inner ring 36, outer ring 3 7. Positioning area 38, compression area 39, second spring 40, through hole 41, tapered surface 42, limiting ball 43, accommodating groove 44, protrusion 45, annular groove 46, annular member 47, protruding head 48, first annular body 49, second annular body 50, third annular body 51, inner groove 52, first contact surface 53, second contact surface 54, stroke area 55, dividing groove 56, first guide slope 57, extension portion 58, guide block 59, second guide slope 60, first blocking surface 61, guide groove 62, deepened groove 63, second blocking surface 64, thickened portion 65, bearing surface 66, first through hole 67, second through hole 68, docking hole 69. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] like Figures 1 to 14As shown, the green construction site dust prevention device of the present invention includes a base 1 and a mounting assembly 2. The mounting assembly 2 is used to assemble the barrel 3, which is convenient for subsequent maintenance and disassembly. No other tools are required, and the disassembly and assembly can be completed by one person. This not only saves disassembly and assembly time, but also reduces the difficulty of operation, realizes single and quick operation, is conducive to improving disassembly and assembly efficiency, and also ensures the stability of the barrel 3.

[0039] The interior of the base 1 is provided with a bracket 4, a mounting frame 5 is provided on the bracket 4, and a rotating disk 6 is provided on the mounting frame 5. The rotating disk 6 can realize the rotation of the fixed frame 7, thereby realizing the rotation of the barrel 3. A fixed frame 7 is provided on the rotating disk 6, and the barrel 3 is provided in the middle of the fixed frame 7. The bracket 4 is provided with a motor 8 and a pump 9. The motor 8 drives the pump 9 to work through a belt, and then pumps water into the barrel 3 to achieve spraying.

[0040] The barrel 3 is composed of a first body 10 and a second body 11. The second body 11 is provided with a mounting portion 12, and the first body 10 is provided with a mounting opening 13 that cooperates with the mounting portion 12. During assembly, the mounting portion 12 is aligned with the mounting opening 13. A bearing seat 14 is provided on the fixing frame 7, and a rotating shaft 15 is provided in the middle of the bearing seat 14, one end of which is connected to the mounting portion 12. A hydraulic cylinder 16 is also provided at the lower end of the fixing frame 7. The upper end of the hydraulic cylinder 16 is hingedly connected to the lower end of the front end of the second body 11. The extension and retraction of the hydraulic cylinder 16 can change the height of the front end of the barrel 3 to achieve angle adjustment.

[0041] A filter screen 17 is provided in the barrel 3 , and arc-shaped grooves for installing the filter screen 17 are provided on the inner walls of the first barrel 10 and the second barrel 11 .

[0042] The mounting assembly 2 is used to connect the first barrel 10 and the second barrel 11, so that they can be stably installed and easily disassembled. The mounting assembly 2 includes a first mounting member 18 mounted on the first barrel 10 and a second mounting member 19 mounted on the second barrel 11. After the first mounting member 18 and the second mounting member 19 are connected, the first barrel 10 and the second barrel 11 can be installed.

[0043] The first mounting member 18 comprises a first mounting block 20 and a docking post 21, which is provided with multiple ball-end slots 22. The docking post 21 comprises a first column 23, a second column 24, a third column 25, and a fourth column 26. The ball-end slots 22 are located on the third column 25. The diameters of the first, second, third, and fourth columns 23, 24, 25, and 26 decrease in order. The first column 23 is connected to the first mounting block 20, which is in turn connected to the outer wall of the first cylindrical body 10.

[0044] Second mounting member 19 comprises a second mounting block 27 and a docking base 28. Docking base 28 comprises an inner tube 29 and an outer tube 30. Inner tube 29 is positioned in the middle of outer tube 30. A retaining ring 31 is positioned in the middle of inner tube 29. Retaining ring 31 is installed by pushing retaining arms 32 to deform it, and then installing it inside. A first spring 33 is positioned at the lower end of retaining ring 31, and is positioned in the middle of inner tube 29.

[0045] A movable gap 34 is formed between the outer tube 30 and the inner tube 29. A docking hole 69 is formed in the center of the inner tube 29, which mates with the docking post 21. A movable member 35 is positioned within this movable gap 34. This member 35 comprises an inner ring 36 and an outer ring 37, with a second through-hole 68 formed in the center of the inner ring 36. A positioning region 38 is formed between the inner and outer rings 36, 37, with the outer tube 30 positioned within this region. A compression region 39 is defined between the upper end of the outer tube 30 and the upper end surface of the positioning region 38. This compression region 39 allows the movable member 35 to move downward, compressing the second spring 40.

[0046] A second spring 40 is installed within the movable gap 34 and is located at the lower end of the inner ring 36. The inner cylinder 29 is provided with multiple through-holes 41 that mate with the ball head slots 22. A tapered surface 42 is provided within the through-holes 41. The end of the tapered surface 42 facing the outer cylinder 30 is larger in diameter than the end facing the inner cylinder 29, facilitating the movement of the limiting ball 43 into the receiving slot 44 under its own gravity. The inner ring 36 is provided with multiple receiving slots 44 that mate with the through-holes 41. Within the through-holes 41 are located the limiting ball 43, which mates with the ball head slots 22 and the receiving slots 44.

[0047] like Figure 5 As shown, at this point, the first mounting member 18 and the second mounting member 19 remain inserted, the limiting ball 43 is located in the ball head groove 22 and the through hole 41, and the receiving groove 44 is located at the upper end of the through hole 41. When the movable member 35 is pushed downward, the second spring 40 is compressed, and the receiving groove 44 moves downward, maintaining the through hole 41 and the receiving groove 44 aligned. Furthermore, because the through hole 41 is provided with an inclined conical surface 42, the limiting ball 43 enters the receiving groove 44 under the action of gravity, thereby removing the limiting ball 43 from the ball head groove 22. At this point, without the restraint of the limiting ball 43, the first spring 33 can push the retaining ring 31 upward, driving the first mounting member 18 upward a distance, so that the upper end of the retaining ring 31 is located in the middle of the through hole 41, preventing the limiting ball 43 from moving out of the receiving groove 44 under the push of the second spring 40.

[0048] The elastic force of the first spring 33 is greater than the elastic force of the second spring 40, so that when pushing the movable part 35, the first spring 33 can be maintained to push the retaining ring 31 and the first mounting part 18 upward, so as to press the movable part 35, so that the limiting ball 43 can be moved out of the ball head groove 22, thereby releasing the restriction of the first mounting part 18.

[0049] A raised portion 45 is located in the center of the inner cylinder 29. An annular groove 46 is formed in the center of the raised portion 45. An annular member 47 is located within the annular groove 46. A raised head 48 is located at the lower end of the fourth column 26, which engages with the annular member 47. The annular member 47 is a rubber ring that prevents collision between the first and second mounting members 18, 19 during installation. Once the first mounting member 18 is inserted, the annular member 47 is squeezed and deformed.

[0050] A first through-hole 67 is formed in the center of the retaining ring 31. The retaining ring 31 is composed of a first annular body 49, a second annular body 50, and a third annular body 51. The outer diameter of the first annular body 49 mates with the inner wall of the inner cylinder 29, and the outer diameter of the first annular body 49 is smaller than that of the second annular body 50. The outer diameter of the third annular body 51 is smaller than that of the first annular body 49. An inner groove 52 is provided in the center of the inner cylinder 29. The second annular body 50 is disposed within the inner groove 52. The lower end of the second annular body 50 contacts the upper end of the first spring 33, and the outer diameter of the second annular body 50 mates with the inner wall of the inner groove 52.

[0051] Since the outer diameter of the second annular body 50 is larger than the inner diameter of the inner cylinder 29 , during installation, the retaining ring 31 needs to push the retaining arm 32 open, causing the force to deform, so that the second annular body 50 can be kept in the inner groove 52 .

[0052] The second annular body 50 is provided with a first contact surface 53, and the upper end of the inner groove 52 forms a second contact surface 54 that matches the first contact surface 53. Figure 5 As shown, the first mounting member 18 is now inserted into the second mounting member 19, and the first contact surface 53 and the second contact surface 54 are separated, forming a travel region 55 therebetween. When the first contact surface 53 and the second contact surface 54 are in contact, the first spring 33 has already pushed the retaining ring 31 upward, and the first mounting member 18 is removed from the middle of the second mounting member 19.

[0053] The inner cylinder 29 is provided with a plurality of dividing grooves 56 , which divide the inner cylinder 29 into a plurality of deformable retaining arms 32 . The retaining arms 32 can be deformed under load, which facilitates the installation of the retaining ring 31 and the movable part 35 .

[0054] A first guiding slope 57 is provided on the retaining arm 32 , an extension portion 58 is provided at the lower end of the inner ring 36 , a guiding block 59 is provided on the inner wall of the lower end of the extension portion 58 and cooperates with the first guiding slope 57 , and a second guiding slope 60 and a first blocking surface 61 are provided on the guide block 59 .

[0055] The retaining arm 32 is provided with symmetrically arranged guide grooves 62, which are arranged on both sides of the through hole 41. The lower end of the guide groove 62 is provided with a deepened groove 63, and the depth of the deepened groove 63 is greater than the depth of the guide groove 62. A second blocking surface 64 that cooperates with the first blocking surface 61 is formed between the deepened groove 63 and the guide groove 62.

[0056] When the first blocking surface 61 and the second blocking surface 64 are in contact, the movable member 35 is pushed upward by the second spring 40, and the second spring 40 is also in a slightly compressed state, so that the movable member 35 is forced upward. When the first blocking surface 61 and the second blocking surface 64 are separated, the second spring 40 is in a compressed state.

[0057] A thickened portion 65 is provided at the lower end of the retaining arm 32, and a bearing surface 66 is provided on the thickened portion 65. When the movable member 35 is pressed downward, the extension portion 58 is kept on the bearing surface 66. The bearing surface 66 is used to limit the travel distance of the movable member 35 moving downward.

[0058] When docking the first mounting member 18 and the second mounting member 19, the docking post 21 is first inserted into the center of the inner cylinder 29. The third column 25 pushes the retaining ring 31 to compress the first spring 33, separating the first contact surface 53 and the second contact surface 54. The ball head slot 22 remains connected to the through hole 41, and the limiting ball 43 no longer restricts the position of the movable member 35. The second spring 40 is maintained to push the movable member 35 upward, pushing the limiting ball 43 from the receiving slot 44 into the ball head slot 22, thereby restricting the position of the first mounting member 18.

[0059] To disassemble the first barrel 10, the operator simply pushes each movable member 35 downward, compressing the second spring 40 and maintaining communication between the receiving groove 44 and the through-hole 41. Under its own weight, the retaining ball 43 enters the receiving groove 44 along the inclined tapered surface 42. The first spring 33 then pushes the retaining ring 31 and the first mounting member 18 upward for a distance, positioning the upper end surface of the retaining ring 31 in the middle of the through-hole 41, thereby blocking the position of the retaining ball 43. After the first mounting member 18 is removed, the first spring 33 continues to push the retaining ring 31 upward, bringing the first contact surface 53 into contact with the second contact surface 54.

[0060] After all the movable parts 35 are pushed down, the entire first cylinder 10 can be removed from the second cylinder 11, and the internal filter 17, motor, and fan blades can be cleaned. No other tools are required, and one staff member can achieve disassembly and assembly, which improves maintenance efficiency.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dust prevention device for green construction sites, characterized in that: include: A base, wherein a bracket is provided inside the base, a mounting frame is provided on the bracket, a rotating disk is provided on the mounting frame, a fixing frame is provided on the rotating disk, a barrel is provided in the middle of the fixing frame, and the barrel consists of a first barrel body and a second barrel body; and A mounting assembly for connecting a first cylinder to a second cylinder, the mounting assembly comprising a first mounting member mounted on the first cylinder and a second mounting member mounted on the second cylinder, The first mounting member is composed of a first mounting block and a docking post, and the docking post is provided with a plurality of ball head grooves; The second mounting member is composed of a second mounting block and a docking seat, and the docking seat is composed of an inner cylinder and an outer cylinder, a retaining ring is provided in the middle of the inner cylinder, a first spring is provided at the lower end of the retaining ring, a movable gap is formed between the outer cylinder and the inner cylinder, a movable member is provided in the movable gap, the movable member is composed of an inner ring and an outer ring, a positioning area is formed between the inner ring and the outer ring, the outer cylinder is arranged in the positioning area, a second spring is provided in the movable gap, the second spring is at the lower end of the inner ring, a plurality of through holes are provided on the inner cylinder that cooperate with the ball head groove, a plurality of accommodating grooves are provided on the inner ring that cooperate with the through holes, a limiting ball that cooperates with the ball head groove and the accommodating groove is provided in the through hole, The docking column is composed of a first column, a second column, a third column and a fourth column, the ball head groove is provided on the third column, and the diameters of the first column, the second column, the third column and the fourth column are successively reduced; A raised portion is provided in the middle of the inner cylinder, an annular groove is formed in the middle of the raised portion, an annular member is provided in the annular groove, and a raised head is provided at the lower end of the fourth column to cooperate with the annular member; The retaining ring is composed of a first annular body, a second annular body and a third annular body. The outer diameter of the first annular body matches the inner wall of the inner cylinder. The outer diameter of the first annular body is smaller than the outer diameter of the second annular body. The outer diameter of the third annular body is smaller than the outer diameter of the first annular body. An inner groove is provided in the middle of the inner cylinder. The second annular body is disposed in the inner groove. The lower end of the second annular body contacts the upper end of the first spring. When the first mounting member and the second mounting member need to be docked and installed, the docking column is first inserted into the middle of the inner cylinder, and the retaining ring is pushed by the third column to compress the first spring, and the ball head groove is kept in communication with the through hole. The limiting ball no longer restricts the position of the movable member, and the second spring is kept pushing the movable member to move upward, pushing the limiting ball from the receiving groove into the ball head groove, thereby restricting the position of the first mounting member; When disassembling the first cylinder, first push the movable part downward so that the second spring is compressed, keeping the accommodating groove connected to the through hole. Under its own gravity, the limiting ball enters the accommodating groove along the inclined conical surface. Then the first spring can push the retaining ring and the first mounting part upward for a distance, so that the upper end face of the retaining ring is in the middle position of the through hole, which can block the position of the limiting ball. After the first mounting part is taken out, the first spring continues to push the retaining ring upward.

2. The dust prevention device for green construction sites according to claim 1, characterized in that: The elastic force of the first spring is greater than the elastic force of the second spring.

3. The dust prevention device for green construction sites according to claim 1, characterized in that: The second annular body is provided with a first contact surface, and the upper end of the inner groove forms a second contact surface that matches the first contact surface.

4. The dust prevention device for green construction sites according to claim 1, characterized in that: The inner cylinder is provided with a plurality of dividing grooves, which divide the inner cylinder into a plurality of force-bearing deformable retaining arms, the retaining arms are provided with a first guiding inclined surface, the lower end of the inner ring is provided with an extension portion, the lower end inner wall of the extension portion is provided with a guide block that cooperates with the first guiding inclined surface, and the guide block is provided with a second guiding inclined surface and a first blocking surface.

5. The dust prevention device for green construction sites according to claim 4, characterized in that: The retaining arm is provided with symmetrically arranged guide grooves, which are arranged on both sides of the through hole. The lower end of the guide groove is provided with a deepened groove, and a second blocking surface that cooperates with the first blocking surface is formed between the deepened groove and the guide groove.

6. The dust prevention device for green construction sites according to claim 4, characterized in that: A thickened portion is provided at the lower end of the retaining arm, and a bearing surface is provided on the thickened portion. When the movable member is pressed downward, the extending portion is kept placed on the bearing surface.

7. The dust prevention device for green construction sites according to claim 1, characterized in that: A tapered surface is provided in the through hole, and the diameter of the tapered surface at one end facing the outer cylinder is larger than that at the other end facing the inner cylinder.

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