A flotation equipment for non-ferrous metal mines

Abstract

The present invention relates to the field of mineral flotation technology, specifically a non-ferrous metal mine flotation equipment, comprising a flotation machine body, a feed pipe, a discharge pipe, a discharge bin, an aerator, and an air guide assembly, wherein the outer surface of one side of the flotation machine body is fixedly connected to a position near the bottom end thereof, and the outer surface of one side of the flotation machine body is fixedly connected to a position at the upper end thereof, the inner surface of the flotation machine body is provided with a discharge bin near the top end thereof, and the outer surface of the upper end of the flotation machine body is provided with an aerator near the middle end thereof. By providing an air guide assembly, the present invention can introduce gas into the interior of the flotation machine body while causing the air guide pipe and the hose of the transmission assembly to swing under the action of the air flow, thereby causing the slurry inside the flotation machine body to flow over a large range, thereby enabling the gas to be evenly and fully diffused into the slurry, thereby forming more bubbles.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral flotation, in particular to non-ferrous metal mine flotation equipment. Background Art

[0002] Froth flotation is often used to separate fine mineral particles. Compared to shaker beneficiation, high-gradient magnetic separation, and oil aggregation, bubble flotation offers greater efficiency and lower costs. The main principle of flotation is based on the different surface chemical properties of minerals and slag, utilizing the natural hydrophobicity of mineral particles and the hydrophilicity of slag to separate minerals from impurities.

[0003] The flotation machine in the prior art stirs the slurry through a mechanical device. The stirring direction of the device is relatively single, and the flotation machine with insufficient stirring effect has a reduced probability of adhesion and collision between useful mineral particles and bubbles, so that the bubbles cannot fully contact with the mineral particles. The flotation machine with strong stirring effect will cause the hydrophilic slag to float up under the influence of water flow, resulting in serious entrainment pollution and reduced flotation accuracy.

[0004] Therefore, a nonferrous metal mine flotation equipment is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a non-ferrous metal mine flotation equipment. By setting up an air guide component, it is possible to introduce gas into the interior of the flotation machine body while causing the air guide pipe and the hose of the transmission component to swing under the action of the airflow, so that the slurry inside the flotation machine body produces a large-scale flow, thereby enabling the gas to be evenly and fully diffused into the slurry, thereby forming more bubbles, and increasing the probability of adhesion and collision between mineral particles and bubbles. At the same time, during this process, the stirring component can be driven to operate, so that the slurry, foaming agent and gas fully collide and contact, thereby improving the sorting effect, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a non-ferrous metal mine flotation equipment, comprising a flotation machine body, a feed pipe, a discharge pipe, a discharge bin, an aerator and an air guide assembly, wherein the outer surface of one side of the flotation machine body is fixedly connected to the discharge pipe near the bottom end, and the outer surface of one side of the flotation machine body is fixedly connected to the feed pipe at the upper end, the inner surface of the flotation machine body is provided with a discharge bin near the top end, and the outer surface of the upper end of the flotation machine body is provided with an aerator near the middle, the output end of the aerator passes through the interior of the flotation machine body and is fixedly connected to the air guide assembly.

[0007] Preferably, the air guide component includes a fixed cylinder, an annular tube, a connecting pipe, a transmission component and a stirring component. The output end of the aerator passes through the interior of the flotation machine body and is fixedly connected to the fixed cylinder, and the outer surface of the fixed cylinder near the upper end is fixedly connected with several groups of connecting pipes in a circular shape at equal distances. Several groups of connecting pipes are fixedly connected to the annular tube at one end away from the fixed cylinder, and the connecting pipes, the annular tube and the interior of the fixed cylinder are all communicated with each other. Several groups of transmission components are fixedly connected to the outer surface of the lower end of the annular tube in a circular shape at equal distances. The lower end of the fixed cylinder is provided with a stirring component. The transmission component includes a hose, an air guide pipe, an elastic sheet and a nozzle. If the hose is fixedly connected to the outer surface of the lower end of the annular tube, and the inner surface of the annular tube is communicated with the inner surface of the hose, the outer surface of the lower end of the hose is fixedly connected to the air guide pipe, and the outer surface of the lower end of the air guide pipe is fixedly connected to the nozzle.

[0008] During operation, the mixed liquid enters the interior of the flotation machine body through the feed pipe, and the air enters the interior of the fixed cylinder through the aerator, and flows through the fixed cylinder to the interior of the connecting pipes around and into the interior of the annular tube. The gas inside the annular tube flows along the hose to the interior of the air guide tube under the action of the aerator continuously inputting gas into the air guide component, and enters the interior of the flotation machine body through the nozzle at the lower end of the air guide tube, and moves upward to generate bubbles. In this process, the amount of gas is output to the interior of the air guide component in a changing state, so the gas flow rate inside the air guide tube is changing. The air guide tube is subjected to the combined effect of the continuous gas speed change and the bubbles generated in the flotation machine body, which drives the hose to swing around, thereby causing the slurry inside the flotation machine body to fluctuate over a large range, thereby allowing the gas to diffuse evenly and fully into the slurry to form more bubbles.

[0009] Preferably, elastic sheets are fixedly connected to both sides of the outer surface of the upper end of the air guide tube, and the elastic sheets are made of metal and are wavy.

[0010] By providing an elastic sheet, the hose can be supported to a certain extent, and the metal elastic sheet can increase the frequency of vibration generated by the entire transmission component when it is subjected to external impact, thereby improving the effect of gas generation in the slurry, compared to using only the hose.

[0011] Preferably, the inner surface of the air guide tube is provided with a plurality of groups of arcuate grooves at equal distances from top to bottom, and the cross-section of the arcuate grooves is annular, and an arcuate protrusion is formed between two adjacent groups of the arcuate grooves.

[0012] By providing a plurality of groups of arcuate grooves at equal distances from top to bottom on the inner surface of the air guide tube, and forming arcuate protrusions between two adjacent groups of the arcuate grooves, the flow velocity and flow direction of the air flow inside the air guide tube can be changed, thereby increasing the intensity of the swing of the air guide tube and the frequency of the change of the slurry state, so that the gas can be evenly and fully diffused into the slurry.

[0013] Preferably, a plurality of impact cavities are provided inside the air guide tube, and impact balls are provided inside the impact cavities, and the cross-sectional area of the impact balls is smaller than the cross-sectional area of the impact cavities.

[0014] When the air guide tube is affected by the air flow and the impact of the slurry inside the flotation machine body and swings to both sides, the impact ball inside the impact chamber shakes and vibrates inside the impact chamber along with the air guide tube, thereby strengthening the impact on the slurry around the air guide tube and improving the efficiency and uniformity of gas dispersion inside the slurry.

[0015] Preferably, the stirring assembly includes a movable rod, a stirring rod, a piston, a sealing ring and a buoyancy plate. A connecting hole is provided on the outer surface of the lower end of the fixed cylinder, and the interior of the fixed cylinder is movably connected to the piston. The outer surface of the piston is communicated with the inner surface of the fixed cylinder, and the outer surface of the lower end of the piston is fixedly connected to the movable rod. The lower end of the movable rod passes through the connecting hole and extends to the interior of the flotation machine body, and the outer surface of the movable rod is fixedly connected to several groups of stirring rods. The outer surface of the movable rod is fixedly connected to the buoyancy plate near the top, the cross-sectional area of the piston is larger than the cross-sectional area of the connecting hole, and a sealing ring is fixedly connected to the connection between the inner surface of the connecting hole and the movable rod, and the inner surface of the sealing ring is tightly fitted with the inner surface of the movable rod.

[0016] Part of the gas flowing through the fixed cylinder moves downward along the fixed cylinder under the action of the aerator. Therefore, the movable rod and the stirring rod on its surface are pushed downward by the air pressure inside the piston fixed cylinder. When the amount of gas output by the aerator decreases, the gas inside the fixed cylinder moves upward. At this time, the buoyancy plate pushes the movable rod to move upward along the fixed cylinder under the action of buoyancy. In this way, the stirring rod is repeatedly driven up and down inside the flotation machine body, thereby cooperating with the transmission component to stir the slurry inside the flotation machine body, further improving the efficiency and uniformity of gas dispersion inside the slurry and enhancing the sorting effect.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] By providing an air guide assembly, gas can be introduced into the flotation machine body while the air guide pipe and hose of the transmission assembly swing under the action of the air flow, causing the slurry inside the flotation machine body to flow over a large area. As a result, the gas can be evenly and fully diffused into the slurry, thereby forming more bubbles and increasing the probability of adhesion and collision between mineral particles and bubbles. At the same time, during this process, the stirring assembly can be driven to operate, so that the slurry, foaming agent and gas can fully collide and contact. At the same time, the vertical vibration and oscillation of the air guide pipe can also give the rising bubble pressure alternating changes, generating a tearing force in the liquid in the pressure area. When the pressure of the wave on the bubble aggregates connected by the water film tension between adjacent bubbles exceeds the ultimate tension of the water film between the bubbles, the water film breaks, and the bubble aggregates disperse into single bubbles and float upward. The hydrophilic mineral particles that are mechanically entrained or non-selectively attached lose their support and are freed under the action of appropriate vibration inertia and fall back into the slurry. Hydrophobic mineral particles will not be desorbed under a certain vibration intensity, thereby reducing entrainment contamination and improving the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 For the present invention Figure 1 A magnified view of A;

[0021] Figure 3 For the present invention Figure 1 An enlarged view of B;

[0022] Figure 4 For the present invention Figure 1 Enlarged view of C;

[0023] Figure 5 For the present invention Figure 1 Cross-sectional view of DD;

[0024] Figure 6 It is a structural view of the transmission component of the present invention.

[0025] In the figure: 1. Flotation machine body; 2. Feed pipe; 3. Discharge pipe; 4. Discharge bin; 5. Aerator; 6. Air guide assembly; 61. Fixed cylinder; 62. Ring pipe; 63. Connecting pipe; 7. Transmission assembly; 71. Hose; 72. Air guide pipe; 73. Elastic sheet; 74. Air jet head; 75. Arc groove; 76. Arc protrusion; 77. Impact chamber; 78. Impact ball; 8. Stirring assembly; 81. Movable rod; 82. Stirring rod; 83. Piston; 84. Sealing ring; 85. Buoyancy plate; 86. Connecting hole. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figures 1 to 6 , the present invention provides a technical solution:

[0028] A nonferrous metal mine flotation equipment, such as Figure 1 As shown, it includes a flotation machine body 1, a feed pipe 2, a discharge pipe 3, a discharge bin 4, an aerator 5 and an air guide component 6. The discharge pipe 3 is fixedly connected to the bottom end of the outer surface of one side of the flotation machine body 1, and the feed pipe 2 is fixedly connected to the upper end of the outer surface of one side of the flotation machine body 1. The discharge bin 4 is provided near the top end of the inner surface of the flotation machine body 1, and the aerator 5 is provided near the middle of the upper end outer surface of the flotation machine body 1. The output end of the aerator 5 passes through the interior of the flotation machine body 1 and is fixedly connected to the air guide component 6.

[0029] As an embodiment of the present invention, Figures 1 to 6 As shown, the air guide assembly 6 includes a fixed cylinder 61, an annular tube 62, a connecting pipe 63, a transmission assembly 7 and a stirring assembly 8. The output end of the aerator 5 passes through the interior of the flotation machine body 1 and is fixedly connected to the fixed cylinder 61. The outer surface of the fixed cylinder 61 is fixedly connected to a plurality of groups of connecting pipes 63 at equal distances near the upper end thereof in an annular shape. The ends of the plurality of connecting pipes 63 away from the fixed cylinder 61 are fixedly connected to the annular tube 62. The connecting pipes 63, the annular tube 62 and the interior of the fixed cylinder 61 are all in communication. The transmission component 7 is annular and equidistantly fixedly connected to the outer surface of the lower end of the annular tube 62. The lower end of the fixed cylinder 61 is provided with a stirring component 8. The transmission component 7 includes a hose 71, an air guide tube 72, an elastic sheet 73 and a nozzle 74. If the hose 71 is fixedly connected to the outer surface of the lower end of the annular tube 62, and the inner surface of the annular tube 62 is communicated with the inner surface of the hose 71, the outer surface of the lower end of the hose 71 is fixedly connected to the air guide tube 72, and the outer surface of the lower end of the air guide tube 72 is fixedly connected to the nozzle 74.

[0030] During operation, the mixed liquid enters the interior of the flotation machine body 1 through the feed pipe 2, and the air enters the interior of the fixed cylinder 61 through the aerator 5. The air flows through the fixed cylinder 61 to the surrounding connecting pipes 63 and into the interior of the annular tube 62. Under the action of the aerator 5 continuously inputting gas into the air guide assembly 6, the gas inside the annular tube 62 flows along the hose 71 into the air guide pipe 72, and enters the interior of the flotation machine body 1 through the nozzle 74 at the lower end of the air guide pipe 72, and moves upward to generate bubbles. During this process, the amount of gas is output to the interior of the air guide assembly 6 in a changing state, so the gas flow rate in the air guide pipe 72 is also changing. The air guide pipe 72 is subjected to the combined action of the continuous gas speed change and the bubbles generated in the flotation machine body 1, which drives the hose 71 to swing around, thereby causing the slurry inside the flotation machine body 1 to fluctuate over a large range, thereby allowing the gas to be evenly and fully diffused into the slurry to form more bubbles.

[0031] As an embodiment of the present invention, Figure 6 As shown, elastic sheets 73 are fixedly connected to both sides of the outer surface of the upper end of the air guide tube 72 , and the elastic sheet 73 is made of metal and is wavy.

[0032] By providing the elastic sheet 73, the hose 71 can be supported to a certain extent. In addition, the metal elastic sheet 73 can increase the frequency of vibration generated by the entire transmission component 7 when subjected to external impact, thereby improving the effect of gas generation in the slurry, compared with using only the hose 71.

[0033] As an embodiment of the present invention, Figure 1 and Figure 3 As shown, the inner surface of the air guide tube 72 is provided with a plurality of groups of arcuate grooves 75 at equal distances from top to bottom, and the cross section of the arcuate grooves 75 is annular, and an arcuate protrusion 76 is formed between two adjacent groups of the arcuate grooves 75 .

[0034] By providing a plurality of groups of arcuate grooves 75 at equal distances from top to bottom on the inner surface of the air guide tube 72, and forming arcuate protrusions 76 between two adjacent groups of the arcuate grooves 75, the flow velocity and flow direction of the air flow inside the air guide tube 72 can be changed, thereby increasing the intensity of the swing of the air guide tube 72 and the frequency of the slurry state change, so that the gas can be evenly and fully diffused into the slurry.

[0035] As an embodiment of the present invention, Figure 3 As shown, a plurality of impact cavities 77 are provided inside the air guide tube 72 , and impact balls 78 are provided inside the impact cavities 77 . The cross-sectional area of the impact balls 78 is smaller than the cross-sectional area of the impact cavities 77 .

[0036] When the air guide tube 72 is affected by the air flow and the impact of the slurry inside the flotation machine body 1 and swings to both sides, the impact ball 78 inside the impact cavity 77 swings and vibrates inside the impact cavity 77 along with the air guide tube 72, thereby strengthening the impact on the slurry around the air guide tube 72 and improving the efficiency and uniformity of gas dispersion inside the slurry.

[0037] As an embodiment of the present invention, Figure 1 and Figure 4 As shown, the stirring assembly 8 includes a movable rod 81, a stirring rod 82, a piston 83, a sealing ring 84 and a buoyancy plate 85. A connecting hole 86 is provided on the outer surface of the lower end of the fixed cylinder 61, and the piston 83 is movably connected to the interior of the fixed cylinder 61. The outer surface of the piston 83 is communicated with the inner surface of the fixed cylinder 61, and the outer surface of the lower end of the piston 83 is fixedly connected to the movable rod 81. The lower end of the movable rod 81 passes through the connecting hole 86 and extends to the interior of the flotation machine body 1, and a plurality of groups of stirring rods 82 are fixedly connected to the outer surface of the movable rod 81. The outer surface of the movable rod 81 is fixedly connected to the buoyancy plate 85 near the top. The cross-sectional area of the piston 83 is larger than the cross-sectional area of the connecting hole 86, and a sealing ring 84 is fixedly connected to the connection between the inner surface of the connecting hole 86 and the movable rod 81. The inner surface of the sealing ring 84 fits tightly with the inner surface of the movable rod 81.

[0038] Part of the gas flowing through the fixed cylinder 61 moves downward along the fixed cylinder 61 under the action of the aerator 5. Therefore, the piston 83 pushes the movable rod 81 and the stirring rod 82 on its surface downward under the action of the air pressure inside the fixed cylinder 61. When the amount of gas output by the aerator 5 decreases, the gas inside the fixed cylinder 61 moves upward. At this time, the buoyancy plate 85 pushes the movable rod 81 to move upward along the fixed cylinder 61 under the action of buoyancy. In this way, the stirring rod 82 is repeatedly driven to move up and down inside the flotation machine body 1, thereby cooperating with the transmission component 7 to stir the slurry inside the flotation machine body 1, further improving the efficiency and uniformity of gas dispersion inside the slurry and enhancing the sorting effect.

[0039] Working principle: During operation, the mixed liquid enters the interior of the flotation machine body 1 through the feed pipe 2, and the air enters the interior of the fixed cylinder 61 through the aerator 5, and flows through the fixed cylinder 61 to the surrounding connecting pipes 63 and into the interior of the annular tube 62. Under the action of the aerator 5 continuously inputting gas into the air guide component 6, the gas inside the annular tube 62 flows along the hose 71 to the interior of the air guide pipe 72, and enters the interior of the flotation machine body 1 through the nozzle 74 at the lower end of the air guide pipe 72, and moves upward to generate bubbles. In this process, the amount of gas is output to the interior of the air guide component 6 in a changing state, so the gas flow rate inside the air guide pipe 72 is also changing. The air guide pipe 72 is subjected to the combined action of the continuous gas speed change and the bubbles generated in the flotation machine body 1, which drives the hose 71 and the elastic sheet 73 to swing around, thereby causing the slurry inside the flotation machine body 1 to fluctuate over a large range, thereby allowing the gas to be evenly and fully diffused into the slurry to form more bubbles.

[0040] At the same time, by providing a plurality of groups of arcuate grooves 75 at equal distances from top to bottom on the inner surface of the air guide tube 72, and forming arcuate protrusions 76 between two adjacent groups of the arcuate grooves 75, the flow velocity and flow direction of the air flow inside the air guide tube 72 can be changed, thereby increasing the intensity of the swing of the air guide tube 72 and the frequency of the slurry state change, so that the gas can be evenly and fully diffused into the slurry;

[0041] When the air guide tube 72 is affected by the air flow and the impact of the slurry inside the flotation machine body 1 and swings to both sides, the impact ball 78 inside the impact cavity 77 swings and vibrates inside the impact cavity 77 along with the air guide tube 72, thereby strengthening the impact on the slurry around the air guide tube 72 and improving the efficiency and uniformity of gas dispersion inside the slurry.

[0042] Part of the gas flowing through the fixed cylinder 61 moves downward along the fixed cylinder 61 under the action of the aerator 5. Therefore, the piston 83 pushes the movable rod 81 and the stirring rod 82 on its surface downward under the action of the air pressure inside the fixed cylinder 61. When the amount of gas output by the aerator 5 decreases, the gas inside the fixed cylinder 61 moves upward. At this time, the buoyancy plate 85 pushes the movable rod 81 to move upward along the fixed cylinder 61 under the action of buoyancy. In this way, the stirring rod 82 is repeatedly driven to move up and down inside the flotation machine body 1, thereby cooperating with the transmission component 7 to stir the slurry inside the flotation machine body 1, further improving the efficiency and uniformity of gas dispersion inside the slurry and enhancing the sorting effect.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A non-ferrous metal mine flotation equipment, comprising a flotation machine body (1), a feed pipe (2), a discharge pipe (3), a discharge bin (4), an aerator (5) and an air guide assembly (6), characterized in that: A discharge pipe (3) is fixedly connected to a position near the bottom end of the outer surface of one side of the flotation machine body (1), and a feed pipe (2) is fixedly connected to a position at the upper end of the outer surface of one side of the flotation machine body (1). A discharge bin (4) is provided on a position near the top end of the inner surface of the flotation machine body (1), and an aerator (5) is provided on a position near the middle of the outer surface of the upper end of the flotation machine body (1). The output end of the aerator (5) passes through the interior of the flotation machine body (1) and is fixedly connected to the air guide component (6). The air guide assembly (6) comprises a fixed cylinder (61), an annular tube (62), a connecting tube (63), a transmission assembly (7) and a stirring assembly (8); the output end of the aerator (5) passes through the interior of the flotation machine body (1) and is fixedly connected to the fixed cylinder (61); and a plurality of groups of connecting tubes (63) are fixedly connected in an annular shape and at equal distances to the outer surface of the fixed cylinder (61) near the upper end; the ends of the plurality of connecting tubes (63) away from the fixed cylinder (61) are fixedly connected to the annular tube (62); and the interiors of the connecting tubes (63), the annular tube (62) and the fixed cylinder (61) are all in communication; and a plurality of groups of the transmission assemblies (7) are fixedly connected in an annular shape and at equal distances to the outer surface of the lower end of the annular tube (62); and a stirring assembly (8) is provided at the lower end of the fixed cylinder (61); The transmission component (7) includes a hose (71), an air guide tube (72), an elastic sheet (73) and an air nozzle (74). If the hose (71) is fixedly connected to the outer surface of the lower end of the annular tube (62), and the inner surface of the annular tube (62) is communicated with the inner surface of the hose (71), the outer surface of the lower end of the hose (71) is fixedly connected to the air guide tube (72), and the outer surface of the lower end of the air guide tube (72) is fixedly connected to the air nozzle (74).

2. The non-ferrous metal mine flotation equipment according to claim 1, characterized in that: Elastic sheets (73) are fixedly connected to both sides of the outer surface of the upper end of the air guide tube (72), and the material of the elastic sheet (73) is metal material, and the elastic sheet (73) is wavy.

3. The non-ferrous metal mine flotation equipment according to claim 2, characterized in that: The inner surface of the air guide tube (72) is provided with a plurality of groups of arc-shaped grooves (75) at equal distances from top to bottom, and the cross section of the arc-shaped grooves (75) is annular, and an arc-shaped protrusion (76) is formed between two adjacent groups of the arc-shaped grooves (75).

4. The non-ferrous metal mine flotation equipment according to claim 3, characterized in that: A plurality of impact cavities (77) are provided inside the air guide tube (72), and impact balls (78) are provided inside the impact cavities (77). The cross-sectional area of the impact balls (78) is smaller than the cross-sectional area of the impact cavities (77).

5. The non-ferrous metal mine flotation equipment according to claim 1, characterized in that: The stirring assembly (8) comprises a movable rod (81), a stirring rod (82), a piston (83), a sealing ring (84) and a buoyancy plate (85). A connection hole (86) is provided on the outer surface of the lower end of the fixed cylinder (61), and the interior of the fixed cylinder (61) is movably connected to the piston (83). The outer surface of the piston (83) is in communication with the inner surface of the fixed cylinder (61), and the outer surface of the lower end of the piston (83) is fixedly connected to the movable rod (81). The lower end of the movable rod (81) passes through the connection hole (86) and extends to the interior of the flotation machine body (1), and the outer surface of the movable rod (81) is fixedly connected to a plurality of groups of stirring rods (82). The outer surface of the movable rod (81) is fixedly connected to the buoyancy plate (85) near the top.

6. The non-ferrous metal mine flotation equipment according to claim 5, characterized in that: The cross-sectional area of the piston (83) is larger than the cross-sectional area of the connecting hole (86), and a sealing ring (84) is fixedly connected to the connection between the inner surface of the connecting hole (86) and the movable rod (81), and the inner surface of the sealing ring (84) is tightly fitted with the inner surface of the movable rod (81).

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