JP3149456U - Joining structure of rotor and shaft of rotary joint, and media mixing mill equipped with rotary joint having the joining structure - Google Patents

Abstract

To provide a joint structure between a rotor and a shaft of a rotary joint having a small dimensional tolerance of a fitting part of a product. In a joint structure between a rotor and a shaft of a rotary joint, a joint structure for firmly joining the rotor and shaft of the rotary joint using a bushing that is expanded by pressurized liquid. The bushing 104 includes an annular base member 130 and a sleeve-like body 106 extending therefrom in the head direction. The sleeve-like body 106 is interposed between the rotor and the free end. In the sleeve-like main body 106, an annular space 132 is formed substantially over the entire length in the longitudinal direction. The working liquid 134 is injected into the space 132. By forming the space 132, the sleeve-like main body 106 is formed with an outer tube portion 106a and an inner tube portion 106b. [Selection] Figure 4

Description

  The present invention relates to a joint structure between a rotor and a shaft of a rotary joint, and a media mixing mill provided with the connection structure.

  The joint structure between the rotor and shaft of a conventional rotary joint is usually a screw-fixed type, but there is a limit to the processing accuracy at the threaded part, and the balance is lost due to the misalignment of the shaft, causing vibration. . Further, since the screws are fastened by surface contact in the axial direction, it is necessary to provide clearance between the screw surfaces. Furthermore, in order to prevent rusting, stainless steel is often used. However, due to the above-described clearance, frictional sliding occurs between the screw surfaces, and seizure of the screw portion occurs, which is a problem.

In order to solve the above problem, Japanese Patent Application Laid-Open No. 2003-49451 proposes a coupling structure using coupler-like desorption means.
According to the above publication, by using this coupler-like attachment / detachment means, it is possible to attach / detach with one touch. To enable attachment / detachment with one touch in this way, there is a dimensional tolerance of the fitting part of parts. There is a problem that the core cannot be put out with respect to the rotating object as in the case of screw mounting.
JP 2003-49451 A

  Accordingly, an object of the present invention is to provide a joint structure between a rotor and a shaft of a rotary joint that solves the above-described problems.

The above problem is solved by the joint structure of the rotor and shaft of the rotary joint of the present invention having the following configuration.
(1)
In the joint structure of the rotor and shaft of the rotary joint, one end of the first end that is the mounting end of the rotary joint and the second end that is the mounting end of the shaft is inserted into the insertion hole provided at the other end. The insertion hole is configured to have an inner diameter larger than an outer diameter of the one end to form an annular space, and the annular space includes the rotary A sleeve-like body of a bushing for joining the rotor and the shaft of the joint is inserted, and the sleeve-like body is composed of an outer tube and an inner tube, and an annular shape for liquid injection is interposed therebetween. A liquid injection space is provided, a working liquid is injected into the liquid injection space, and a pressurizing means for pressurizing the working liquid is provided. Pressurizing the working liquid to push the outer tube of the sleeve-shaped body outward and the inner tube inward, thereby bringing the outer tube into frictional contact with the inner wall of the insertion port of the other tube; A joining structure for bringing the inner tube into frictional contact with the outer wall of the one end, thereby firmly joining the rotor and shaft of the rotary joint.
(2)
A media mixing mill provided with a rotary joint having the joining structure described in (1) above.
(3)
A pulverization container having a raw material inlet and having a spherical pulverization chamber, an agitation member rotatably installed in the pulverization chamber near the inner wall of the pulverization container, a pulverization medium placed in the pulverization chamber, and the pulverization The media mixing mill according to (2), further including a centrifugal media separation member that is indoors and is rotatably disposed to face the stirring member.
(4)
The media mixing mill according to (3), wherein the media separating member is disposed in the vicinity of a central portion of the spherical crushing chamber.
(5)
The media mixing mill according to (3) or (4) above, wherein the pulverization container itself is spherical.
(6)
The media mixing mill according to any one of (3) to (5), wherein the stirring member is rotatable around a rotation axis passing through a center of the circular crushing chamber.
(7)
The media mixing mill according to (6), wherein the pulverization container can be divided into two on a surface passing through the center of the pulverization chamber and orthogonal to the rotation axis of the stirring member.
(8)
The media mixing mill according to any one of (3) to (7) above, wherein a jacket for passing a refrigerant or a heat medium is provided on an outer periphery of the pulverization container so that the temperature in the pulverization chamber can be controlled.
(9)
The media mixing mill according to any one of (3) to (8) above, wherein the stirring member can be driven at a rotational speed in the range of 5 to 40 m / s.
(10)
Any one of (3) to (9) above, wherein the agitation member is a saddle type, the stirring member is disposed below the crushing chamber, and the media separating member is disposed above the crushing chamber. Media mixing mill.
(11)
The above-mentioned (3), wherein the media separating member is fixed to one end, and includes a hollow media separating member drive shaft extending outside the grinding chamber, and the inside of the media separating member drive shaft serves as a raw material outlet. The media mixing mill according to any one of (1) to (10).

  In the joint structure of the present invention, since the contact is in the radial direction and the joint surface can be made long, the blur is small, the joint system is improved, vibration during rotation can be suppressed as much as possible, and play must be provided in the joint. Since there is no frictional sliding contact, there is no risk of seizure.

  Hereinafter, a structure for joining a rotor and a shaft of a rotary joint according to a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings. In the following description, a structure in which this joining structure is incorporated in a media mixing mill will be described.

FIG. 1 illustrates a media mixing mill incorporating a joint structure between a rotor and a shaft of a rotary joint according to an embodiment of the present invention. In the following description, a saddle type mill will be described, but the mill of the present invention may of course be a horizontal type.
FIG. 1 shows a media mixing mill 10 according to an embodiment of the present invention. The media mixing mill 10 includes a substantially spherical crushing container 12. The crushing container 12 includes a spherical crushing chamber 14 therein, and has a raw material inlet 16 for introducing a slurry-like raw material into the crushing chamber 14. As long as the grinding chamber 14 is spherical, the shape of the grinding container 12 itself may be any shape, but is preferably spherical as described above. A circular opening 12a is provided in the lower center of the crushing container 12 (a similar opening is provided in a jacket described later), and the opening 12a protrudes above the upper center of the frame 18. The ring-shaped portion 18a is fitted. On the other hand, a circular opening 12b is provided in the upper center of the crushing container 12 (the same opening is provided in a jacket described later), and a cylindrical casing 20 is fitted into this opening 12b. The lower end of the casing 20 extends vertically to the inside of the crushing chamber 14.

  A stirring member 22 is rotatably disposed in the center of the lower part of the grinding chamber 14 of the grinding container 12. The stirring member 22 may have a conventional structure. For example, the hub portion 22a disposed at the center, an extension portion 22b extending a predetermined length radially outward from the hub portion 22a, and the extension portion 22b An agitation member main portion 22c substantially in the shape of a gear tooth supported at the outer peripheral tip is integrally provided. The extension 22b is provided with a plurality of openings 22d, and the plurality of openings 22d are a plurality of crushing media circulation openings. A rotation drive shaft 24 that is a stirring member drive shaft is fixed to the hub portion 22a. The rotary drive shaft 24 extends through the frame 18 downward in the axial direction, and its end is connected to a drive source via a well-known drive mechanism (not shown) and rotates in the direction indicated by the arrow in the figure. Driven. The rotation axis (rotation axis) of the rotation drive shaft 24 preferably passes through the center of the spherical crushing chamber 14. The rotary drive shaft 24 is provided with a shaft seal 25 (mechanical seal or the like). As is well known in the media mixing mill, a bead-shaped grinding medium 30 (shown extremely enlarged in the drawing) is accommodated in the grinding container 12. The pulverizing medium 30 may have a diameter of 0.02 to 2 mm.

  The crushing container 12 is disposed in the upper part of the crushing chamber 14 and in the vicinity of the center of the crushing chamber 14 so as to face the stirring member at an interval in the axial direction and dispersed in the slurry-like raw material. A centrifugal separation member 32 for separating the medium 30 from the raw material is provided. The media separating member 32 is of a centrifugal impeller type and is preferably arranged coaxially with the stirring member, but the axis may be shifted. A hollow rotary drive shaft 34 is fixed to the media separating member 32. The drive shaft 34 extends upward through the casing 20, and an end portion of the drive shaft 34 is connected to a drive source via a well-known drive mechanism (not shown) and is driven to rotate in a direction indicated by an arrow in the drawing. The rotary drive shaft 34 is provided with a shaft seal 36 (mechanical seal or the like). The hollow portion of the drive shaft 34 communicates with the internal space of the media separating member 32 to form a raw material outlet 38.

  The media separating member 32 has a plurality of blade members 44 arranged at equal intervals in the circumferential direction (coaxial to the rotation drive shaft 34) between the hub portion 32a and the closing plate 32b (see FIG. 2A). ). The blade member 44 may be arranged in a completely radial manner as shown in FIG. 2A or may be arranged in an inclined manner as shown in FIG. Alternatively, the blade member 44 may have a quadrangular shape whose cross section gradually becomes narrower inward as shown in FIG.

  A jacket 40 for passing a refrigerant body or a heat medium (usually a refrigerant body and cooling water) is provided on the outer periphery of the pulverization container 12 so that the temperature in the pulverization chamber 14 can be adjusted. The jacket 40 is provided with a cooling water inlet 42 for introducing cooling water into the lower portion and a cooling water outlet 46 for discharging cooling water into the upper portion.

  The pulverization container 12 passes through the center of the pulverization chamber 14 and can be divided into two on a plane orthogonal to the rotation axis (vertical axis) of the stirring member 22. The same applies to the jacket 40. Thereby, the crushing container 12 can be opened and maintenance can be easily performed.

  In the media mixing mill, the stirring member 22 can be driven at a rotational speed in the range of 5 to 40 m / s, and the media separating member 32 can be driven at a rotational speed in the range of 10 to 20 m / s. Is possible.

  In this media mixing mill, since the stirring member 22 is sufficiently separated from the media separating member 32, the interference of the media separating member 32 is extremely small.

  The rotary drive shaft 34 has a free end portion (upper end in FIG. 1) 34a having an outer diameter reduced, and the free end portion 34a has a sleeve-like rotor 102 of the rotary joint 100 and a sleeve-like shape of a bushing 104. The main body 106 (in FIG. 3, the outline of the bushing 104 is drawn) is fitted in a state of being interposed.

  Next, referring to FIG. 4 and subsequent drawings, a structure for coupling the rotary drive shaft 34 to the rotary joint 100 will be described.

  The rotary joint 100 includes a head 110 having a structure in which an annular flange 109 is attached to the center of a tubular member 108. A tubular casing 112 is integrally attached to the surface of the flange 109 on the rotation drive shaft 34 side. In the example of the figure, it is fixed with bolts 114.

  The end 102 a of the rotor 102 opposite to the rotational drive shaft 34 has a reduced diameter and is inserted into the casing 112. The tip 102b of the end 102a extends until it approaches the end 108a of the tubular member 108 on the rotor 102 side.

  The rotor 102 is rotatably supported by the casing 112 via a bearing 116 disposed between the end 102 a and the casing 112.

  A step 102c is provided inside the tip 102b of the end 102a, and a ring-shaped sliding contact material 118 is fixed to the step 102c. Further, a step 108c is provided inside the tip 108b of the end portion 108a, and a ring-shaped sliding contact member 120 that is in close contact with the sliding contact member 118 is slid in the rotational direction and the axial direction. It is arranged to be movable.

Between the sliding contact material 120 and the flange 109, a spring 122 for biasing the sliding contact material 120 toward the sliding contact material 118 and bringing the sliding contact material 120 into close contact with the sliding contact material 118 is disposed. The sliding contact material 118 and the sliding contact material 120 form a seal between the rotor 102 side and the head 110 side when the rotor 102 side rotates and the head 110 side does not rotate. The end of the sleeve-like member 108 is joined to the end of the slurry-like raw material discharge pipe 122 by a hail clamp 124.

  As described above, the rotary drive shaft 34 and the rotor 102 are firmly and coaxially joined by the bushing 104 which is a joining member (this constitutes the main part of the joining structure of the embodiment of the present invention). Yes.

  Hereinafter, the detailed structure of the bushing 104 will be described with reference to FIG.

  The bushing 104 includes an annular base member 130 and a sleeve-like body 106 extending therefrom in the direction of the head 110 (in FIG. 3). The sleeve-like body 106 is interposed between the rotor 102 and the free end 34a. As shown in FIGS. 4 to 6, the sleeve-like main body 106 is formed with an annular space 132 in substantially the entire length in the longitudinal direction. The working liquid 134 is injected into the space 132. By forming the space 132, the sleeve-like main body 106 is formed with an outer tube portion 106a and an inner tube portion 106b.

  The annular base member 130 is provided with an injection passage 136 that communicates with the space 132 and injects the working liquid 134 into the space 132. The inlet portion 138 of the injection passage 136 is a pressurizing portion that applies pressure to the working liquid 134 injected into the space 132, and the pressure screw 140 is screwed together. The working fluid 134 is pressurized by filling the space 132 and the injection passage 136 with a working fluid and screwing the pressure screw 140 into the inlet of the injection passage 136. When pressure is applied to the working fluid 134 in this way, the outer tube portion 106a expands (deforms) radially outward and the inner tube portion 106b expands radially inward, whereby the rotary drive shaft 34 and the rotor 102 are expanded. Are firmly connected.

  The wall thickness of the outer tube portion 106a and the inner tube portion 106b of the sleeve-like main body 106 is preferably moderate. If it is too thick, even if the above-described pressure is applied to the working fluid 134, the outer tube portion 106a and the inner tube portion 106b cannot expand well, and thus the rotary drive shaft 34 and the rotor 102 are firmly connected. You may not be able to. On the other hand, if it is too thin, the strength of the outer tube portion 106a and the inner tube portion 106b will not be sufficient.

  In operation, first, the space 132 and the injection passage 136 are filled with a working fluid, and the pressure screw 140 is screwed into the inlet portion of the injection passage 136 so as to apply pressure to the working fluid 134, whereby the outer tube portion. The rotational drive shaft 34 and the rotor 102 are firmly connected by expanding (deforming) 106a radially outward and the inner tube portion 106b radially inward. In this state, the stirring member 22 is rotationally driven while introducing the raw material, which is a slurry containing particles to be pulverized, from the raw material inlet 16 into the pulverization chamber 14. The slurry introduced into the pulverizing chamber 14 is moved downward in the direction of the agitating member 22 on the slurry already formed in the pulverizing chamber 14 and the rotating flow f1 of the medium 30, and is agitated and mixed by the agitating member 22. The The agitated and mixed slurry and the media 30 become a flow f2 that moves up and around the inner wall of the crushing chamber 14, and when it rises, it becomes a previous flow f1. In the vicinity of the center of the crushing chamber 14 and slightly above, the slurry and the media are rotated by the media separating member 32. Due to this rotational movement, the medium with a large mass is biased radially outward and separated from the slurry. In this case, among the particles to be pulverized, particles that are not sufficiently pulverized and have a large particle size behave similarly to the media. On the other hand, the slurry containing particles that have been sufficiently pulverized and have a reduced mass enters the internal space of the media separation member 32, and is mixed with the media through the raw material outlet 38, the rotary joint 100, and the discharge pipe 112 inside the rotary shaft 34. It is discharged outside the mill.

  With the above coupling structure, the rotary drive shaft 34 that is the shaft and the rotor 102 of the rotary joint can be firmly coupled without the shaft core being shaken. As a result, the vibration of the entire apparatus is extremely reduced, and the seizure of the connecting portion is achieved. Is also prevented.

  In the media mixing type mill having the above structure, the raw material particles are crushed and dispersed in high quality by the contact of the freely moving grinding media in the flows f1 and f2. As a result, a high quality product is obtained. available. In addition, according to the present media mixing mill, it is possible to achieve pulverization with a narrow particle size distribution width by the above-described action.

It is sectional drawing which shows the media mixing type mill by embodiment of this invention. (A), (B), (C) is sectional drawing which shows the example of the blade member of the media separation member each used for the media mixing mill shown in FIG. It is sectional drawing which shows the coupling structure of the shaft and rotor in the rotary joint by the embodiment of this invention. It is sectional drawing of the bushing used for the said coupling structure. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. It is sectional drawing which follows the line BB of FIG.

DESCRIPTION OF SYMBOLS 10 Media mixing mill 12 Crushing container 12a Opening 12b Opening 14 Crushing chamber 16 Raw material inlet 18 Frame 18a Ring-shaped part 20 Casing 22 Stirring member 22a Hub part 22b Extension part 22c Stirring member main part 22d Opening 24 Rotation drive shaft 25 Shaft seal 30 Grinding media 32 Media separation member 32a Hub portion 32b Closure plate 34 Hollow drive shaft 36 Shaft seal 38 Raw material outlet 40 Jacket 40a Cooling water inlet 40b Cooling water outlet 44 Blade member 100 Rotary joint 102 Rotor 104 Bushing 106 Sleeve-shaped main body 108 Tubular member 119 鍔 110 Head 112 Casing 114 Bolt 116 Bearing 118 Sliding material 120 Sliding material 122 Spring 124 Hail clamp 130 Base member 132 Space 134 Working liquid 13 6 Inlet passage 138 Inlet portion 140 pressure screw of injecting passage

Claims (11)

  In the joint structure of the rotor and shaft of the rotary joint, one end of the first end that is the mounting end of the rotary joint and the second end that is the mounting end of the shaft is inserted into the insertion hole provided at the other end. The insertion hole is configured to have an inner diameter larger than an outer diameter of the one end to form an annular space, and the annular space includes the rotary A sleeve-like body of a bushing for joining the rotor and the shaft of the joint is inserted, and the sleeve-like body is composed of an outer tube and an inner tube, and an annular shape for liquid injection is interposed therebetween. A liquid injection space is provided, a working liquid is injected into the liquid injection space, and a pressurizing means for pressurizing the working liquid is provided. Pressurizing the working liquid to push the outer tube of the sleeve-shaped body outward and the inner tube inward, thereby bringing the outer tube into frictional contact with the inner wall of the insertion port of the other tube; A joining structure for bringing the inner tube into frictional contact with the outer wall of the one end, thereby firmly joining the rotor and shaft of the rotary joint.   A media mixing mill comprising a rotary joint having the joint structure according to claim 1.   A pulverization container having a raw material inlet and having a spherical pulverization chamber, an agitation member rotatably installed in the pulverization chamber near the inner wall of the pulverization container, a pulverization medium placed in the pulverization chamber, and the pulverization The media mixing mill according to claim 2, further comprising a centrifugal media separation member that is disposed indoors and is rotatably arranged to face the stirring member.   The media mixing mill according to claim 3, wherein the media separating member is disposed in the vicinity of a central portion of the spherical crushing chamber.   The media mixing mill according to claim 3 or 4, wherein the pulverization container itself is spherical.   The media mixing mill according to any one of claims 3 to 5, wherein the stirring member is rotatable around a rotation axis passing through a center of the circular crushing chamber.   The media mixing mill according to claim 6, wherein the pulverization container can be divided into two on a surface passing through the center of the pulverization chamber and orthogonal to the rotation axis of the stirring member.   The media mixing mill according to any one of claims 3 to 7, wherein a jacket for passing a refrigerant or a heat medium is provided on an outer periphery of the pulverization container so that the temperature in the pulverization chamber can be controlled.   The media mixing mill according to any one of claims 3 to 8, wherein the stirring member can be driven at a rotational speed in a range of 5 to 40 m / s.   The media mixing unit according to any one of claims 3 to 9, wherein the media mixing unit is a bowl type, wherein the stirring member is disposed below the crushing chamber, and the media separating member is disposed above the crushing chamber. Formula mill. 4. The media separating member is fixed to one end, and includes a hollow media separating member drive shaft extending outside the grinding chamber therefrom, and the inside of the media separating member drive shaft serves as a material outlet. The media mixing mill according to any one of 10 to 10.