JP4135145B2 - Sealing device and rotary feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a sealing device and a rotary feeder provided with the sealing device, and in particular, to the inner wall of a casing in which a sealing member is movably fixed by an actuator such as a hydraulic cylinder and an inner wall is formed in a cylindrical side surface shape. The present invention relates to a device that seals the rotating body in the rotational direction between the rotating body and a rotatable body within the casing.
[0002]
[Prior art]
  Conventionally, for example, a rotary feeder for conveying earth and sand in civil engineering work is known (for example, Non-Patent Document 1).
[0003]
  FIG. 5 is a cross-sectional view showing a schematic configuration of a conventional rotary feeder 100, and in particular, a rotation center axis (rotation axis) of a rotating body 9 that is rotatably provided inside the casing 3 of the rotary feeder 100. It is sectional drawing by the plane perpendicular | vertical to CL1.
[0004]
  FIG. 6 is a cross-sectional view showing a schematic configuration of a conventional rotary feeder 100, and is a view showing a VIA-VIB cross section in FIG.
[0005]
  The conventional rotary feeder 100 conveys an object to be transported (for example, earth and sand) through the housing 3 by rotating a rotating body (rotating member) 9 that can rotate inside the housing 3. The apparatus includes a casing 3 having a cylindrical side wall-shaped inner wall 3 </ b> A. In order to introduce an object to be conveyed from the outside of the casing 3 into the casing 3, A transported object introduction port 3B is provided on one side of the inner wall 3A.
[0006]
  In addition, in order to discharge an object to be transported introduced into the housing 3 from the inside of the housing 3 to the outside of the housing 3, the other side of the inner wall 3A of the housing 3 is placed on the other side. A conveyed product discharge port 3C is provided. The conventional rotary feeder 100 is normally installed and used with the conveyed object introduction port 3B on the upper side and the conveyed object discharge port 3C on the lower side.
[0007]
  A pipe 5 is connected to the transported object discharge port 3C for transporting the transported object that has come out of the transported object discharge port 3C. Further, in the vicinity of the transported object discharge port 3C, Compressed fluid ejecting means 7 capable of ejecting a compressed fluid (for example, compressed air) in the direction of the arrow AR9 for compressing the conveyed object in the pipe 5 in the direction of the arrow AR1 is provided.
[0008]
  In addition, a rotating body 9 is provided inside the casing 3, and the rotating body 9 has a center axis CL1 in the extending direction of the cylindrical side wall 3A of the casing 3 as a rotation center. 1 is rotatable in the direction of an arrow AR5 shown in FIG. Then, as the rotating body 9 rotates, as shown by the arrow AR3, the transferred object introduced into the casing 3 from the transferred object introduction port 3B passes through the casing 3. Then, it is transported to the transported object discharge port 3C and discharged into the pipe 5 as indicated by an arrow AR7.
[0009]
  Further, at both ends of the rotating body 9 in the direction of the rotation center axis CL1, in order to prevent the transported object from leaking out of the rotary feeder 100, each disk-shaped axial partition member 103A, 103B is provided. Further, seals 105A, 105B formed of rubber packing or the like are provided between the outer peripheral portions of the axial partition members 103A, 103B and the inner wall 3A of the housing 3.
[0010]
  Further, between each rotation direction partition member 9A to 9F extending in the direction from the rotation center axis CL1 of the rotating body 9 toward the inner wall 3A of the casing 3 and the inner wall 3A of the casing, for example, metal. A configured sealing member (not shown) is provided, and the rotating body 9 between the inner wall 3A of the casing 3 and the rotating body 9 rotatable in the casing 3 is provided by the metal sealing member. A sealing device for sealing in the rotational direction is formed.
[0011]
[Non-Patent Document 1]
  Published by Yakumo Shoten Co., Ltd.
  "Fluid conveyor [Conveyor series 3]", December 30, 1959
[0012]
[Problems to be solved by the invention]
  By the way, in the sealing device of the conventional rotary feeder 100, a metal seal member (for example, the wing of the seal member) for sealing the rotation direction of the rotating body 9 with the inner wall 3A of the housing 3 is long-term. As a result, the gap between the inner wall 3A of the housing 3 and the metal seal member becomes large, and the sealing performance of the sealing device may be reduced.
[0013]
  When the wing of the metal seal member is worn, the operation of the rotary feeder 100 is stopped, the rotary feeder 100 is disassembled, and the wing tip of the metal seal member is replaced with a new one, and the wing The clearance between the tip and the inner wall 3A of the casing 3 is adjusted to return the sealing performance of the sealing device to a good state.
[0014]
  However, the adjustment of the gap between the wing tip and the inner wall 3A of the casing needs to measure the gap using a gaze or a measuring device to accurately determine the attachment position of the wing tip. As described above, since the rotary feeder 100 needs to be disassembled, when the sealing member constituting the sealing device is worn by long-term use of the conventional sealing device, the sealing performance of the conventional sealing device is improved. There is a problem that it is difficult to return to the state.
[0015]
  The reason why the value of the gap between the wing tip and the inner wall 3A of the housing must be adjusted accurately is, for example, that the friction between the wing tip and the inner wall 3A of the housing 3 is excessive. May increase the rotation failure of the rotating body 9, damage to the wings, damage to the housing 3, damage to the rotating body 9, etc. On the other hand, if the gap is increased, the sealing performance will be reduced and the rotary feeder will be damaged. This is because the conveyance efficiency may be reduced, and the above-described problems are avoided.
[0016]
  The above problem is not only the sealing device of the rotary feeder, but also the rotational direction of the rotating body is sealed between the inner wall of the casing whose inner wall is formed in a cylindrical side surface shape and the rotating body that is rotatable in the casing. This is a problem that also occurs in other sealing devices.
[0017]
  The present invention has been made in view of the above problems, and the rotating body between the inner wall of the casing whose inner wall is formed in a cylindrical side surface shape and the rotating body that is rotatable in the casing. In the sealing device for sealing in the rotational direction, when the seal member constituting the sealing device is worn by use, the sealing device can easily return the sealing property of the sealing device to a good state. It aims at providing the rotary feeder provided with the apparatus.
[0018]
[Means for Solving the Problems]
  The invention according to claim 1 is a sealing device for sealing the rotating body in the rotational direction between an inner wall of the housing and a rotating body rotatable in the housing.
  A direction that extends in the direction of the rotation center axis of the rotating body, a base end side is provided on the rotating body, a distal end side extends toward the inner wall, and moves away from or approaches the inner wall of the casing. And a seal member movable relative to the rotating body,
  A fluid pressure cylinder capable of moving the seal member toward the inner wall of the housing;
Sealing member movement preventing means for preventing the sealing member from moving in a direction of protruding from the rotating body from a state in which the tip of the sealing member is in contact with the inner wall of the housing with contact pressure; Have
  The fluid pressure cylinder is
  A pressure chamber formed inside to store fluid, and extends between the pressure member and the outside of the rotating body on the side where the seal member is provided by extending in the moving direction of the seal member. A first through-hole having a columnar shape extends substantially coaxially with the first through-hole and passes between the pressure chamber and the outside of the rotating body on the rotation center axis side of the rotating body. A cylinder body provided with a cylindrical second through-hole formed with a smaller inner diameter;
A cylindrical first engaging portion having an outer diameter slightly smaller than an inner diameter of the first through hole and engageable with the first through hole, and the first engaging portion for holding the seal member The seal member holding portion integrally provided on the seal member side of the first engagement portion, and the second through hole provided integrally with the pressure chamber side of the first engagement portion and coaxially with the first engagement portion. A cylindrical second engaging portion having an outer diameter slightly smaller than the inner diameter of the hole and freely engageable with the second through hole, and the second engaging portion for supplying fluid into the pressure chamber. A piston member provided with a fluid supply hole provided penetrating through the second engagement portion from the vicinity of one end portion on the side opposite to the first engagement portion to the vicinity of the end portion on the first engagement portion side; , And
  The sealing member movement preventing means includes
A male screw portion provided on one end side of the second engaging portion opposite to the first engaging portion and positioned outside the rotating body on the rotation center axis side of the rotating body;
The gist of the present invention is that the nut includes a nut that is screwed into the male screw portion and has an outer diameter larger than the inner diameter of the second through hole..
[0019]
  The invention according to claim 2 is the sealing device according to claim 1,
  A check valve provided in the supply path to prevent the fluid supplied into the fluid pressure cylinder through the supply path from leaking out of the fluid pressure cylinder through the supply path. When,
  HavingAbstract.
[0020]
  The invention according to claim 3 is the claim1 or claim 2In the sealing device according to
  The gist is to have a plurality of fluid pressure cylinders.
[0021]
  The invention according to claim 4 includes a housing having an inner wall;
  In order to introduce the object to be conveyed from the outside of the case into the case, the object to be transferred introduction port provided on the inner wall of the case,
  A discharged object discharge port provided on an inner wall of the casing in order to discharge the transferred object introduced into the casing from the inside of the casing to the outside of the casing;
  A rotating body that is rotatably provided in the housing and conveys the object to be conveyed from the object to be conveyed introduction port to the object to be conveyed discharge port;,
A seal in the rotational direction of the rotating body between the inner wall of the housing and a rotating body rotatable within the housing, comprising the specific matters of the invention according to any one of claims 1 to 3. A sealing device forTo have preparedAbstract.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
  FIG. 1 is a diagram showing a schematic configuration of a sealing device 11 provided in a rotary feeder 1 according to an embodiment of the present invention, and FIG. 2 is a diagram showing an IIA-IIB arrow view in FIG. These are figures which show the IIIA-IIIB arrow in FIG.
[0023]
  The sealing device 11 is provided between the rotating body 9 (respective rotation direction partition members 9A to 9F) shown in FIG. 5 and the inner wall 3A of the housing 3, for example, in the I portion shown in the figure. Yes.
[0024]
  The rotary feeder 1 according to the embodiment of the present invention is different from the conventional sealing device in the configuration of each sealing device 11 and is configured in substantially the same manner as the conventional rotary feeder 100 in other points.
[0025]
  That is, as shown in FIG. 5, the rotary feeder 1 includes a housing 3 having a cylindrical side wall-shaped inner wall 3 </ b> A, and an object to be transported (for example, earth and sand) from the outside of the housing 3. In order to introduce into the inside, a transported object introduction port 3B is provided on one side of the inner wall 3A of the casing 3.
[0026]
  In addition, in order to discharge an object to be transported introduced into the housing 3 from the inside of the housing 3 to the outside of the housing 3, the other side of the inner wall 3A of the housing 3 is placed on the other side. A conveyed product discharge port 3C is provided. Note that, as described above, the conventional rotary feeder 1 is usually installed and used with the transported object introduction port 3B on the upper side and the transported object discharge port 3C on the lower side.
[0027]
  A pipe 5 is connected to the transported object discharge port 3C for transporting the transported object that has come out of the transported object discharge port 3C. Further, in the vicinity of the transported object discharge port 3C, Compressed fluid ejecting means 7 capable of ejecting a compressed fluid (for example, compressed air) for pumping the conveyed object in the pipe 5 in the direction of arrow AR1 in the direction of arrow AR9 is provided (FIG. 5). reference).
[0028]
  In addition, a rotating body 9 is provided inside the casing 3, and the rotating body 9 is centered on the central axis CL 1 in the extending direction of the cylindrical side wall-shaped inner wall 3 A of the casing 3. The body 3 is rotatable in the direction of an arrow AR5 shown in FIG. Then, as the rotating body 9 rotates, as shown by the arrow AR3, the transferred object introduced into the casing 3 from the transferred object introduction port 3B passes through the casing 3. Then, it is transported to the transported object discharge port 3C and discharged into the pipe 5 as shown by an arrow AR7 (see FIG. 5).
[0029]
  The rotating body 9 includes a central member 9Z that extends long in the direction of the central axis CL1 around the rotational central axis CL1 in the extending direction of the inner wall 3A of the cylindrical side surface of the casing 3, and the central member 9Z includes Is provided with a plurality of plate-like partition members 9A to 9F for the rotating direction. The plate-like rotational direction partition member 9A extends, for example, in the direction of the rotational center axis CL1, the proximal end side is fixed to the central member 9Z, and the distal end side is the inner wall 3A of the housing 3. A sealing device 11 is provided between the distal end of the rotating direction partition member 9A and the inner wall 3A of the housing 3 so as to extend to the vicinity.
[0030]
  Each of the other rotation direction partition members 9B to 9F is configured in substantially the same manner as the rotation direction partition member 9A, and each sealing device 11 is similarly provided at the tip. Further, the rotation direction partition members 9A to 9F are provided at positions that are substantially equally distributed in the rotation direction of the central member 9Z.
[0031]
  Furthermore, a space 15 is formed between the rotation direction partition members 9A to 9F and the central member 9Z. In other words, the space 15 forms the outside of the rotating body 9 on the rotation center axis CL1 side of the rotating body 9.
[0032]
  In addition, disc-like shapes provided integrally with each of the rotation direction partition members 9A to 9F are provided at both end sides of the rotation direction partition members 9A to 9F (both ends of the center axis CL1). The axial partition member 103A, the disc-shaped axial partition member 103B, and the seals 105A and 105B are provided to prevent the conveyed object from leaking out of the rotary feeder 1 ( (See FIG. 6).
[0033]
  Each space formed by the rotation direction partition members 9A to 9F, the axial direction partition members 103A and 103B, and the inner wall 3A of the housing 3 rotates the rotating body 9. So that the transported object introduced into the housing 3 from the transported object introduction port 3B passes through the housing 3 and is transported to the transported object discharge port 3C. (See FIG. 5).
[0034]
  Then, when the rotary feeder 1 is operated to transport a transported object such as earth and sand, the transported object is introduced into the housing 3 from the transported object introduction port 3B, the rotating body 9 rotates, and the transported object is discharged. The object to be conveyed is discharged from the outlet 3 </ b> C, and the discharged object to be conveyed is further conveyed in the pipe 5 by the compressed fluid ejecting means 7.
[0035]
  Next, the sealing device 11 will be described.
[0036]
  As shown in FIGS. 1 and 5, the sealing device 11 is arranged between the inner wall 3 </ b> A of the housing 3 whose inner wall is formed in a cylindrical side surface shape and the rotating body 9 in the rotational direction of the rotating body 9. It is a device for sealing. The rotating body 9 is rotatable in the casing 3 in a non-contact state with the inner wall 3A except for a bearing portion, with an axis substantially coincident with the central axis of the inner wall 3A as a rotation center axis CL1. Is provided.
[0037]
  Further, the sealing device 11 includes a seal member 13, which is made of metal or rubber having elasticity, extends in the direction of the rotation center axis CL1 of the rotating body 9, and a base end portion. A direction 17 is provided on the rotating body 9, a distal end portion 19 side extends toward the inner wall 3 </ b> A, and moves away from or approaches the inner wall 3 </ b> A of the housing 3 (from the proximal end portion 17 side to the distal end portion 19. In a direction toward the side; a direction away from or approaching the rotation center axis CL1 of the rotating body 9; a direction indicated by an arrow AR11 in FIG. Note that the moving direction may cross obliquely with respect to the direction away from or approaching the inner wall 3A of the housing 3.
[0038]
  Moreover, between the said rotary body 9 and the said sealing member 13, it is an example of the fluid pressure cylinder which operate | moves with the pressurized fluid, and the hydraulic pressure which operate | moves with the pressurized hydraulic fluid (incompressible fluid) A cylinder 21 is provided so that the seal member 13 can be moved in the direction of the inner wall 3A of the housing 3 until the tip 19 of the seal member 13 contacts the inner wall 3A of the housing 3 with contact pressure. It has become.
[0039]
  The hydraulic cylinder 21 is connected to a hydraulic supply path (hydraulic supply path) 27 through which hydraulic fluid can be guided to the hydraulic cylinder 21. The hydraulic pressure supply path 27 has one end connected to the hydraulic cylinder 21 and the other hydraulic pressure supply source (pressurized hydraulic fluid supply source) 23 connected to the hydraulic cylinder 21 at the other end. A coupler 25 which is an example of the means is provided. Note that a pressure adjusting valve capable of adjusting the pressure of the hydraulic fluid may be provided between the fluid pressure supply source 23 and the coupler 25.
[0040]
  Further, in the intermediate portion of the hydraulic pressure supply path 27, the fluid supplied through the hydraulic pressure supply path 27 into the hydraulic cylinder 21 leaks out of the hydraulic cylinder 21 through the hydraulic pressure supply path 27. In order to prevent this, a check valve 29 is provided. One connecting portion of the coupler 25 and the check valve 29 are provided in the rotating body 9, and the other connecting portion of the coupler 25 and the fluid pressure supply source 23 are in operation of the rotary feeder 1. It has been removed from the rotary feeder 1.
[0041]
  The rotating member 9A for the rotating direction of the rotating body is composed of two plate-like members 31A and 33A that are separated from each other in the rotating direction of the rotating body 9 and are parallel to each other, and the two members 31A and 33A. In the meantime, the rectangular parallelepiped sealing member 13 can be engaged and moved.
[0042]
  Further, a rectangular parallelepiped seal holding member 35 for holding the seal member 13 is integrally provided on the base end portion 17 side of the seal member 13, and the seal member is interposed via the seal holding member 35. Reference numeral 13 denotes a hydraulic cylinder 21.
[0043]
The seal holding member 35 is also engaged with the rotating body 9 between the two members 31 </ b> A and 33 </ b> A and moves together with the seal member 13.
[0044]
  Further, the sealing device 11 has a plurality of the hydraulic cylinders 21. As shown in FIG. 2, these hydraulic cylinders 21 are provided apart from each other in the direction of the rotation center axis CL1 of the rotating body 9, and the sealing member in the direction of the rotation center axis CL1 of the rotating body 9 is provided. It arrange | positions so that the variation | change_quantity of 13 contact pressure may become small.
[0045]
  For example, specifically, similarly configured hydraulic cylinders (hydraulic cylinders having the same inner diameter) 21 are provided side by side in the extending direction of the rotation center axis CL1 of the rotating body 9. And each hydraulic piping which is the supply path 27 of the hydraulic working oil to each hydraulic cylinder 21 is mutually connected, and it is one hydraulic piping. A check valve 29 is provided at an intermediate portion of the hydraulic pipe, and one end of the hydraulic pipe is connected to a hydraulic fluid supply source 23 via a coupler 25.
[0046]
  By being configured in this way, the forces by which the hydraulic cylinders 21 push the seal member 13 become substantially equal to each other.
[0047]
  Next, the installation positions of the hydraulic cylinders 21 will be described with specific examples.
[0048]
  It is assumed that the seal member 13 and the seal holding member 35 are beams that extend in the direction of the rotation center axis CL1 of the rotator 9, have the same bending rigidity (secondary moment of section × longitudinal elastic modulus), and receive a uniform load. Each hydraulic cylinder 21 is a fulcrum of the beam, and it is assumed that each fulcrum is fixed without moving.
[0049]
  In the above assumption, the hydraulic cylinders 21 are installed at positions where the deflections at both ends of the beam and the deflections at the midpoint between the installation positions of the hydraulic cylinders 21 are substantially equal to each other. Has been.
[0050]
  Further, in the sealing device 11, the seal member 13 protrudes from the rotating body 9 from the state in which the distal end portion 19 of the seal member 13 is in contact with the inner wall 3 </ b> A of the housing 3 with contact pressure (the above-mentioned A seal member movement preventing means 37 is provided to prevent movement in a direction away from the rotation center axis CL1 of the rotating body 9; a direction moving so as to contact the inner wall 3A of the housing 3 with a higher contact pressure. Is provided.
[0051]
  Here, the hydraulic cylinder 21 will be described with specific examples.
[0052]
  As shown in FIG. 1, in order to store hydraulic fluid (fluid), the inside of the rotating body 9 (positioned between the rotation center axis CL <b> 1 of the rotating body 9 and the seal member 13, the rotating body 9 For example, a cylindrical pressure chamber 39 formed in the inside of the member 38 provided integrally therewith, and the pressure chamber 39 and the seal member 13 are provided extending in the moving direction of the seal member 13. A cylindrical through hole 41 penetrating between the outer side of the rotating body 9 on the inner side (the inner wall 3A side of the housing 3), and extending substantially coaxially with the through hole 41, A cylindrical through-hole 43 is formed which penetrates between the pressure chamber 39 and the outside 15 of the rotating body 9 on the rotation center axis CL1 side of the rotating body 9 and has a smaller inner diameter than the through-hole 41. The hydraulic cylinder 21 has a cylinder main body. .
[0053]
  In the hydraulic cylinder 21, the projected figure of the through hole 41 on the plane perpendicular to the moving direction of the seal member 13 is projected onto the plane perpendicular to the moving direction of the seal member 13. Located inside.
[0054]
  Further, the hydraulic cylinder 21 includes a piston member 45, and the piston member 45 has an outer diameter slightly smaller than the inner diameter of the through hole 41 and is freely engageable with the through hole 41 (the through hole 41 And a cylindrical engagement portion 47 (slidable in the moving direction of the seal member 13) and the seal member 13 side of the engagement portion 47 in order to hold the seal member 13. The seal member holding portion (male screw portion) 49 provided on the pressure chamber 39 side of the engagement portion 47 (on the side opposite to the seal member 13 side) and the engagement portion 47 It is provided coaxially and has an outer diameter slightly smaller than the inner diameter of the through-hole 43 and is freely engageable with the through-hole 43 (engaged with the through-hole 43 and slidable in the moving direction of the seal member). A cylindrical engaging portion 51 and the pressure chamber 39 In order to supply fluid to the engagement portion 51, the engagement portion 51 is provided so as to penetrate from the vicinity of one end portion on the opposite side of the engagement portion 47 to the vicinity of the end portion on the engagement portion 47 side. The fluid supply hole (hydraulic hydraulic oil supply hole) 53 is provided.
[0055]
  Here, the seal member movement preventing means 37 will be described with a specific example.
[0056]
  The seal member movement preventing means 37 is provided on one end side of the engaging portion 51 opposite to the engaging portion 47, and the outside of the rotating body 9 on the rotation center axis CL 1 side of the rotating body 9. A male screw portion 55 located in the space 15 and a nut 57 which is 55 screwed into the male screw and has an outer diameter larger than the inner diameter of the through hole 43 are provided.
[0057]
  When pressurized hydraulic fluid (hydraulic fluid having a pressure higher than atmospheric pressure) is supplied into the pressure chamber 39, due to the difference in area between the engagement portion 47 and the engagement portion 51, The piston member 45 moves in the direction of the inner wall 3A of the casing 3, and along with this movement, the seal member 13 moves from the rotation center axis CL1 of the rotating body 9 toward the inner wall 3A of the casing 3. Moving. Then, the seal member 13 comes into contact with the inner wall 3 </ b> A of the housing 3 with contact pressure.
[0058]
  Further, after the contact, the nut 57 is tightened and the nut 57 is brought into contact with the member 38, whereby the tip 19 of the seal member 13 is in contact with the inner wall 3A of the housing 3 with contact pressure. Therefore, it is possible to prevent the seal member 13 from moving in the direction of jumping out of the rotating body 9. In addition, after the nut 57 is tightened, another nut 59 is screwed into the male screw portion 55 so that the nut 57 is not loosened.
[0059]
  A rotating valve 9 is provided in parallel with the check valve 29 so as to allow the hydraulic fluid to flow or shut off the hydraulic fluid. As a result, when the hydraulic cylinder 21 is disassembled for maintenance, for example, the hydraulic fluid in the hydraulic cylinder 21 can be easily removed.
[0060]
  Next, adjustment of the sealing device 11 will be described.
[0061]
  As shown in FIG. 5, when an operation of rotating the rotating body 9 and transporting a transported object such as earth and sand from the transported object introduction port 3 </ b> B to the transported object discharge port 3 </ b> C over a long period of time, the inner wall of the casing 3 is performed. And the contact with the seal member 13, the tip 19 side of the seal member 13 is worn, the leakage amount of the sealing device 11 is increased, and the conveying efficiency of the rotary feeder 1 is lowered. In the state where the rotary feeder 1 is in operation, the rotating body 9 rotates, so that the fluid pressure supply source 23 is disconnected and removed from the rotary feeder 1 at the coupler 25 shown in FIGS. It shall be.
[0062]
  When the tip 19 side of the seal member 13 is worn, the operation of the rotary feeder 1 is stopped, the coupler 25 is used to connect the fluid pressure supply source 23 to the hydraulic cylinder 21, and the seal member 13 is sealed at an appropriate pressure. When pressurized hydraulic fluid is supplied to the hydraulic cylinder 21 using the fluid pressure supply source 23 so as to push the inner wall 3A of the body 3, the seal member 13 is pushed, and the housing 3 has an appropriate contact pressure. The tip 19 of the seal member contacts the inner wall 3A.
[0063]
  Thereafter, when the stop valve 61 is open, the stop valve 61 is closed and the hydraulic cylinder 21 and the fluid pressure supply source 23 are separated from each other at the coupler 25. Since the check valve 29 is provided, the pressure of the hydraulic fluid in the hydraulic cylinder 21 is maintained even by the disconnection, and therefore, the force by which the seal member 13 pushes the inner wall 3A of the housing 3 is also maintained.
[0064]
  Subsequently, the seal member movement preventing means 37 is set to prevent the seal member 13 from popping out. That is, the nut 57 is tightened until it comes into contact with the member 38, and further, the nut 57 is tightened with the nut 59 so that the nut 57 is not loosened.
[0065]
  Note that after the supply of the hydraulic working oil to the hydraulic cylinder 21 and before the fluid pressure supply source 23 is disconnected, the seal member movement preventing means 37 may be set to prevent the seal member 13 from popping out.
[0066]
  In addition, since the rotary feeder 1 includes a plurality of the sealing devices 11, the adjustment is sequentially performed on each sealing device 11 that needs to be adjusted, and the rotary feeder 1 is operated after these adjustments.
[0067]
  Thus, in the rotary feeder 1 provided with the inner wall 3A of the casing 3 in which the inner wall 3A is formed in a cylindrical side surface shape and the rotating body 9 that is rotatable in the casing 3, the inner wall 3A When the seal member constituting the sealing device 11 for sealing the rotating body 9 in the direction of the rotation center axis CL1 with the rotating body 9 is worn by, for example, long-term use of the rotary feeder 1, It is possible to easily return the sealing property of the sealing device 11 to a good state. In addition to the maintenance as described above, the assembly adjustment of the seal member 13 can be easily performed when the rotary feeder 1 is manufactured.
[0068]
  That is, according to the sealing device 11, the sealing member 11 that constitutes the sealing device 11 and is movable in a direction approaching and moving away from the inner wall 3 </ b> A of the housing 3 is moved by the hydraulic cylinder 21 to the housing 3. The inner wall 3A is contacted with, for example, a contact pressure.
[0069]
  Therefore, when the seal member 13 constituting the sealing device 11 is worn by use, the hydraulic cylinder 21 is provided via the hydraulic oil supply passage 27 without disassembling the rotary feeder 1 in which the sealing device 11 is used. If the pressurized hydraulic fluid is supplied into the inside, the sealing member 13 constituting the sealing device 11 can be brought into contact with the inner wall 3A of the casing 3, and the sealing performance of the sealing device 11 is good. It is possible to easily return to the correct state. The pressure of the hydraulic oil in the hydraulic cylinder 21 is maintained by a check valve 29 provided in the hydraulic oil supply passage 27 of the hydraulic cylinder 21, and the seal member 13 contacts the inner wall (with a contact pressure). Including the case of contact).
[0070]
  Further, according to the sealing device 11, the seal member 13 extends long in the direction of the rotation center axis CL <b> 1 of the rotator 9, and the contact pressure of the seal member 13 in the direction of the rotation center axis CL <b> 1 of the rotator 9 ( Since the plurality of hydraulic cylinders 21 are arranged so that the amount of change in the force that pushes the inner wall 3A of the housing 3 becomes small, the position of the rotating body 9 in the direction of the rotation center axis CL1 (the seal member 13). Regardless of the position in the longitudinal direction), good sealing properties can be ensured.
[0071]
  Further, since the plurality of hydraulic cylinders 21 push the seal member 13 almost simultaneously with substantially the same force, for example, the rotation of the rotating body 9 can be performed as compared with the case where the seal member 13 is pushed with a plurality of bolts or the like. Adjustment of the contact pressure of the seal member 13 in the direction of the central axis CL1 is facilitated.
[0072]
  In the above description, the amount of change in the contact pressure is reduced depending on the installation positions of a plurality of hydraulic cylinders having the same configuration. However, the hydraulic hydraulic fluid supplied to each hydraulic cylinder is changed to a different inner diameter. The amount of change in the contact pressure may be reduced by changing the pressure.
[0073]
  Further, according to the sealing device 11, the hydraulic cylinder 21 is used to apply force to the seal member 13, and the hydraulic fluid used for driving the hydraulic cylinder 21 is incompressible, so the seal member 13 is Even if the contact pressure is brought into contact with the inner wall 3A of the housing 3 and the supply of the hydraulic fluid to the hydraulic cylinder 21 is stopped after this contact, the sealing member 13 is returned (separated from the inner wall 3A). There is almost no generation | occurrence | production and a sealing property can be maintained in a favorable state.
[0074]
  Furthermore, according to the sealing device 11, since the seal member movement preventing means 37 is provided for preventing the seal member 13 from moving in the direction of jumping out of the rotary body 9, the rotary body 9 is rotated. Even if the seal member 13 is located at the transported object introduction port 3B or the transported object discharge port 3C of the casing 3 of the rotary feeder 1 (where the inner wall 3A of the casing 3 does not exist), The seal member 13 does not jump out of the rotating body 9, and even if the rotating body 9 further rotates and the seal member 13 approaches the place where the inner wall 3 </ b> A of the housing 3 exists, the seal member 13 does not move. There is no possibility of damage due to interference with the inner wall 3A.
[0075]
  In the sealing device 11, as described above, the hydraulic cylinder 21 is incorporated in the rotating body 9. In other words, the member 38 provided integrally with the rotating body 9 is drilled. Thus, since the hydraulic cylinder 21 is formed, the hydraulic cylinder 21 can be reduced, and the installation space for the hydraulic cylinder 21 can be reduced.
[0076]
  Further, since a fluid supply hole (through hole) 53 is provided inside the piston member 45 and hydraulic fluid is supplied through the fluid supply hole 53, the configuration of the hydraulic piping to the hydraulic cylinder 21 is simplified. Can do.
[0077]
  In the above embodiment, the hydraulic fluid has been described as an example, but fluids other than the hydraulic fluid may be used.
[0078]
  Further, a check valve may be provided as shown in FIG. That is, each check valve 29 may be provided for each hydraulic cylinder 21.
[0079]
  In the above embodiment, the sealing device of the rotary feeder 1 has been described as an example. However, not only the rotary feeder but also the inner wall of the casing whose inner wall is formed in a cylindrical side surface shape and a rotating body that is rotatable in the casing. The above embodiment can also be applied to sealing devices of other devices that require sealing in the rotational direction of the rotating body between them and the members that are sealing may be worn.
[0080]
  Although the seal is easily worn by earth and sand, etc., the sealing device 11 can be easily adjusted to maintain the sealing performance even if the sealing member is worn by earth and sand. It can be suitably used for a rotary feeder for conveying earth and sand.
[0081]
【The invention's effect】
  According to the present invention, the sealing for sealing the rotating body in the rotational direction between the inner wall of the casing whose inner wall is formed in a cylindrical side surface shape and the rotating body that is rotatable in the casing. In the apparatus, when the sealing member constituting the sealing device is worn by use, there is an effect that it is easy to return the sealing performance of the sealing device to a good state.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a sealing device provided in a rotary feeder according to an embodiment of the present invention.
FIG. 2 is a diagram showing an arrow IIA-IIB in FIG.
FIG. 3 is a diagram showing an IIIA-IIIB arrow view in FIG. 1;
FIG. 4 is a view showing another example of how to attach the check valve to the sealing device.
FIG. 5 is a cross-sectional view showing a schematic configuration of a conventional rotary feeder.
6 is a cross-sectional view showing a schematic configuration of a conventional rotary feeder, and is a cross-sectional view taken along the line VIA-VIB in FIG.
[Explanation of symbols]
1 Rotary feeder
3 Case
3A Inner wall 3B Conveyed object inlet
3C Conveyed object outlet
9 Rotating body
11 Sealing device
13 Seal member
17 Base end
19 Tip
21 Fluid pressure cylinder
27 Supply path
29 Check valve
37 Seal member movement prevention means
39 Pressure chamber
41 1st through-hole
43 2nd through hole
45 Piston member
47 First engaging portion
49 Seal member holder
51 2nd engaging part
53 Fluid supply hole
55 Male thread
57 nut
CL1 rotation center axis

Claims (4)

In a sealing device for sealing in the rotational direction of the rotating body between an inner wall of the housing and a rotating body rotatable within the housing,
A direction that extends in the direction of the rotation center axis of the rotating body, a base end side is provided on the rotating body, a distal end side extends toward the inner wall, and moves away from or approaches the inner wall of the casing. And a seal member movable relative to the rotating body,
A fluid pressure cylinder capable of moving the seal member toward the inner wall of the housing;
Sealing member movement preventing means for preventing the sealing member from moving in a direction of protruding from the rotating body from a state in which the tip of the sealing member is in contact with the inner wall of the housing with contact pressure; Have
The fluid pressure cylinder is
A pressure chamber formed inside to store fluid, and extends between the pressure member and the outside of the rotating body on the side where the seal member is provided by extending in the moving direction of the seal member. A first through-hole having a columnar shape extends substantially coaxially with the first through-hole and passes between the pressure chamber and the outside of the rotating body on the rotation center axis side of the rotating body. A cylinder body provided with a cylindrical second through-hole formed with a smaller inner diameter;
A cylindrical first engaging portion having an outer diameter slightly smaller than an inner diameter of the first through hole and engageable with the first through hole, and the first engaging portion for holding the seal member A seal member holding portion integrally provided on the seal member side, and a second through-hole provided integrally on the pressure chamber side of the first engagement portion and coaxially with the first engagement portion. A cylindrical second engaging portion having an outer diameter slightly smaller than the inner diameter of the second through hole and engageable with the second through hole, and the second engaging portion for supplying fluid into the pressure chamber. A piston member provided with a fluid supply hole provided penetrating through the second engagement portion from the vicinity of one end portion on the side opposite to the first engagement portion to the vicinity of the end portion on the first engagement portion side; Comprising
The sealing member movement preventing means includes
A male screw portion provided on one end side of the second engaging portion opposite to the first engaging portion and positioned outside the rotating body on the rotation center axis side of the rotating body;
A sealing device comprising: a nut screwed into the male screw portion and having an outer diameter larger than the inner diameter of the second through hole. The sealing device according to claim 1,
A check valve provided in the supply path to prevent the fluid supplied into the fluid pressure cylinder through the supply path from leaking out of the fluid pressure cylinder through the supply path. When,
A sealing device characterized by comprising: The sealing device according to claim 1 or 2 ,
A sealing device comprising a plurality of the fluid pressure cylinders. A housing with an inner wall;
In order to introduce the object to be conveyed from the outside of the case into the case, the object to be transferred introduction port provided on the inner wall of the case,
A discharged object discharge port provided on an inner wall of the casing in order to discharge the transferred object introduced into the casing from the inside of the casing to the outside of the casing;
A rotator which is rotatably provided in the housing and conveys the object to be conveyed from the object to be conveyed introduction port to the object to be conveyed discharge port ;
A seal in the rotational direction of the rotating body between the inner wall of the housing and a rotating body rotatable within the housing , comprising the specific matters of the invention according to any one of claims 1 to 3. A rotary feeder comprising: a sealing device for carrying out the operation .

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