JP3180985U - Screw shaft drive shaft seal structure - Google Patents

Abstract

A seal structure capable of quickly and easily cleaning a gap between through-holes of a screw conveyor drive shaft and a screw conveyor drive shaft provided on an end plate of a cylinder and a seal member sealing the gap. I will provide a.
A sealing member is provided so as to be axially movable along the screw conveyor drive shaft so as to seal a shaft through hole of the screw conveyor drive shaft in the end plate. The seal member 34 is held at the sealing position of the end plate 20 by the rotating hook member 35, and the operation lever 38 can be operated to hold and release the sealing member 34 by the rotating hook member 35.
[Selection] Figure 2

Description

  The present invention relates to a seal structure for a screw conveyor drive shaft used for conveying powders such as foods and pharmaceuticals.

  The screw conveyor device can transfer the powder from one end to the other end in the cylinder from a low place to a high place by rotating a screw installed in the cylinder (see, for example, Patent Document 1). In this screw conveyor device, the transfer amount of the powder can be adjusted by controlling the number of rotations and stop timing of the screw (see, for example, Patent Document 1).

  By the way, when the powder transferred by the screw conveyor is food or medicine, every time the type of powder to be transferred changes, along with the screw conveyor cylinder and screw, the screw conveyor drive shaft and cylinder It is necessary to wash the sealing member that seals the space between the through hole of the screw conveyor drive shaft provided on the end plate.

  If the seal member is left without being cleaned, or if the screw conveyor is restarted with insufficient cleaning, the solidified powder adhering to the seal site will damage the seal member itself. End up. For this reason, until now, it has been necessary to frequently replace the seal member by observing the degree of damage to the seal member or by measuring a preset time.

Japanese Patent Laid-Open No. 07-285639

  However, since the seal member is installed so as to close between the through-holes of the screw conveyor drive shaft and the screw conveyor drive shaft provided on the end plate of the cylindrical body and is not exposed to the outside, the replacement work of the seal member is not performed. It is extremely complicated and takes a long time, and as a result, the powder transfer operation by the screw conveyor is delayed.

  The present invention has been made in view of the above-described circumstances. The purpose of the present invention is to define the clearance between the screw conveyor drive shaft and the through hole of the screw conveyor drive shaft provided in the end plate of the cylinder and the clearance. It is an object of the present invention to provide a drive shaft seal structure for a screw conveyor that can quickly and easily perform cleaning of a sealing member to be sealed.

  In order to achieve the above-described object, a seal structure for a screw conveyor drive shaft according to the present invention includes a motor support member that supports a motor, and a predetermined gap with respect to the motor support member. A conveyor support member that supports one end of a cylindrical body constituting the conveyor; a drive shaft for a screw conveyor that is driven by the motor and passes through the conveyor support member and is connected to a screw shaft end of the screw; and the conveyor support A seal member mounted between the through hole of the screw conveyor drive shaft provided in the member and the screw conveyor drive shaft and mounted so as to be axially movable around the screw conveyor drive shaft; The through hole and the screw provided in the conveyor support member for the seal member A seal member holding piece that is held at a seal position with the drive shaft for the bearing, and an operation lever for holding and releasing the seal member by the seal member holding piece in the gap. It is characterized by.

  With this configuration, when the screw is rotated in the cylinder of the screw conveyor and the powder in the cylinder is transferred from one end of the cylinder to the other end by the screw, the screw conveyor drive shaft and the shaft penetrate therethrough. A seal member seals a gap with the through hole provided in the conveyor support member, and prevents the powder in the cylinder from leaking through the gap.

  When the operation of the screw conveyor is stopped, the operating lever is manually rotated to release the holding (suppression) of the sealing member by the sealing member holding piece, so that the sealing member is driven on the screw conveyor drive shaft. It is possible to move in the axial direction along As the seal member moves, the seal portion, which is the gap between the screw conveyor drive shaft and the through hole provided in the conveyor support member through which the screw conveyor drive shaft is exposed, is exposed to the outside. The outer periphery of the drive shaft for the screw conveyor at the site can be easily cleaned using a cleaning machine or the like.

  On the other hand, after the cleaning operation is completed, the seal member is returned to the original position, the hook portion of the seal member holding piece is overlapped on the side surface of the seal member, and the operation lever is operated to seal the seal member with the hook portion. This completes the setting of the seal member and enables the screw conveyor to be restarted.

  Moreover, the seal structure of the screw conveyor drive shaft according to the present invention is characterized in that the seal member is a labyrinth seal. Thereby, the powder sealing effect can be obtained easily and reliably.

  Further, the seal structure of the screw conveyor drive shaft according to the present invention is a labyrinth seal in which the seal members are combined so as to be split in two in the circumferential direction. As a result, the labyrinth seal can be separated from the screw conveyor drive shaft, and the labyrinth seal can be cleaned more easily and reliably.

  According to the present invention, the gap between the screw conveyor drive shaft and the through hole of the screw conveyor drive shaft provided in the conveyor support member can be reliably sealed, and the gap and the sealing member for sealing the gap can be cleaned. Can be implemented easily and reliably.

  The present invention has been briefly described above. Further, the best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

It is a front view which shows the screw conveyor by embodiment of this invention. It is sectional drawing which expands and shows the structure of the screw conveyor lower end part in FIG. It is a front view which shows the labyrinth seal in FIG. It is a front view which shows the other example of the labyrinth seal in FIG. It is sectional drawing which shows the movement condition of the labyrinth seal in FIG. It is explanatory drawing which shows the holding | maintenance state of the labyrinth seal by the rotation hook member in FIG. It is explanatory drawing which shows the holding | maintenance cancellation | release state of the labyrinth seal by the rotation hook member in FIG. It is sectional drawing which shows the oil seal which can be used instead of the labyrinth seal in FIG.

  A screw conveyor drive shaft seal structure according to an embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 shows a screw conveyor having a seal structure of a drive shaft for a screw conveyor according to this embodiment. The screw conveyor 11 is attached to a support base 12 that holds a cylinder, which will be described later, inclined at a predetermined angle. The support base 12 is installed on a base 14 having wheels 13, and the base 14 is movable on the floor by the rotation of the wheels.

  At the lower end portion of the screw conveyor 11, there is provided a transfer material charging hopper 15 for charging, for example, food or chemical powder as a transfer material into the cylindrical body constituting the screw conveyor 11. On the other hand, at the upper end of the screw conveyor 11, there is provided a transfer object discharge port 16 for discharging the powder that is put into the cylinder of the screw conveyor 11 and transferred by the screw.

  FIG. 2 shows the lower end structure of the screw conveyor 11. This screw conveyor 11 consists of what provided the screw 18 in the cylinder 17 so that rotation was possible. The screw 18 includes a screw shaft 18a and screw blades 18b provided around the screw shaft 18a so as to be continuous in the axial direction (longitudinal direction).

  Further, a ring-shaped flange 19 is integrally coupled to one end (right end in the figure) of the cylindrical body 17 by welding or the like, and the cylindrical body 17 is bolted to an end plate 20 as a conveyor support member via the flange 19. Yes. Specifically, the end plate 20 is provided with a bolt hole 21, and the bolt 23 is screwed into the bolt hole 21 through an attachment hole 22 formed in the flange 19. As a result, the open end of the cylindrical body 17 is in close contact with one side (the left end in the figure) of the end plate 20 via the flange 19.

  On the other hand, a screw conveyor drive shaft 26 that is also a drive shaft of a motor 25 is connected to one end (right end in the figure) of the screw shaft 18 a via a coupler 24. The screw conveyor drive shaft 26 passes through a shaft through hole (through hole) 27 provided in the end plate 20 with a minute gap and is rotatable.

  The motor 25 is attached using fastening means (not shown) so that one end of the motor 25 is supported by a ring-shaped notch 28a formed in the motor attachment plate 28. Further, the motor mounting plate 28 is provided with a through-hole 29 through which a screw conveyor drive shaft 26 that is also a drive shaft of the motor 25 can rotate so as to be continuous with the notch 28a.

  Further, a seal packing 30 for sealing a gap between the screw conveyor drive shaft 26 and the through hole 29 is mounted around the through hole 29 provided in the motor mounting plate 28. The motor mounting plate 28 and the end plate 20 are arranged in parallel and are connected by a bolt 32 via a spacer 31. Therefore, a wider space G is provided between the motor mounting plate 28 and the end plate 20. 20a is an attachment hole provided in the end plate 20, 31a is an attachment hole provided in the spacer 31, and 28b is a bolt hole provided in the motor attachment plate.

  The end plate 20 is provided with a ring-shaped notch 33 having a predetermined depth so as to be continuous with the shaft hole 27. A labyrinth seal 34 as a seal member is detachably mounted in the notch 33. The labyrinth seal 34 seals the powder while leaking it little by little. Specifically, the labyrinth seal 34 forms a plurality of steps of unevenness between the screw conveyor drive shaft 26 that is a rotating portion and the shaft through hole 27, and the powder sequentially passes through the unevenness of each step. It works to lower the leak pressure every time.

  The labyrinth seal (seal member) 34 has a ring shape as shown in FIG. 3, but as shown in FIG. 4, a ring shape formed by combining two half rings 34 a and 34 b may be used. it can.

  A pair of rotating hook members 35 serving as seal member holding pieces are disposed at equal intervals around the notch 33 formed in the end plate 20. Each of the rotating hook members 35 has a base portion 35a and a hook portion 35b parallel to the base portion 35a, and each base portion 35a is screwed into a screw hole 36 provided in the end plate 20. Is inserted. A base portion of the operation lever 38 is fixed to the end of the screw shaft 37.

  The hook portion 35b of the rotating hook member 35 extends in the direction of the notch 33 and has a length that overlaps the side surface (the right side surface in FIG. 2) in the vicinity of the outer periphery of the labyrinth seal 34 as shown in FIG. Therefore, when the operation lever 38 is rotated clockwise, the screw shaft 37 is screwed into the screw hole 36, and the base portion of the operation lever 38 ends the base portion 35a of the rotation hook member (seal member holding piece) 35. The plate 20 is strongly suppressed. As a result, the hook portion 35 b strongly attaches the labyrinth seal 34 to the notch 33.

  On the other hand, when the operation lever 38 is rotated counterclockwise, the screw shaft 37 is loosely engaged with the screw hole 36, so that the rotation hook member 3 is manually operated in the direction of the arrow shown in FIG. This rotation operation makes it possible to release the suppression of the labyrinth seal 34 by the hook portion 35b. Therefore, the labyrinth seal 34 can be moved in the axial direction along the screw conveyor drive shaft 26 by rotating the hook portion 35b about the screw shaft 37 in the direction away from the labyrinth seal 34.

  In addition, when the labyrinth seal 34 which is a seal member is combined so that it can be divided into two as shown in FIG. 4, the half rings 34a and 34b divided into two are picked with fingers of both hands. Thus, they can be easily separated from the drive shaft 26 for the screw conveyor. Therefore, the labyrinth seal 34 is separated in addition to moving in the axial direction, so that cleaning can be performed more easily and reliably.

  As described above, the seal structure of the screw conveyor drive shaft according to the present embodiment includes the screw shaft 18a and the screw in preparation for transferring another powder of different types after the transfer of the powder by the screw conveyor as described above. The work of cleaning the labyrinth seal 34 is facilitated together with the blades 18b and the cylindrical body 17.

  That is, when the powder is transferred, the screw shaft 37 is tightened into the screw hole 36 by the turning operation of the operation lever 38 as described above, and the turning hook member 35 puts the labyrinth seal 34 in the notch 33 of the end plate 20. Hold in close contact. On the other hand, when the operation of the screw conveyor 11 is stopped, the screwing of the screw shaft 37 with respect to the screw hole 36 is loosened by rotating the operation lever 38 in the opposite direction to that described above. The suppression of the labyrinth seal 34 by the rotating hook member 35 is released. Thereby, the labyrinth seal 34 can be moved in the axial direction along the screw conveyor drive shaft 36 or separated so as to be peeled off from the screw conveyor drive shaft 36. As a result, the labyrinth seal 34 can be cleaned individually. In this case, the clearance between the screw conveyor drive shaft 26 and the shaft through hole 27 and the outer periphery of the screw conveyor drive shaft 26 covered with the labyrinth seal 34 can be simultaneously cleaned.

  On the other hand, after the cleaning operation is completed, the labyrinth seal 34 after cleaning is mounted again along the screw conveyor drive shaft 26 and in the notch 33 in the end plate 20, and the hook of the rotating hook member 35 is mounted. The part 35 b is overlapped on the side surface of the labyrinth seal 34, and the operating lever 38 is rotated to fasten the screw shaft 37 into the screw hole 36. As a result, the screw conveyor 11 can be restarted, and the powder charged into the cylinder 17 from the transferred material input hopper 15 by this restart can be transferred to the transferred material discharge port 16 by the rotation of the screw 18. it can.

  In the above embodiment, the case where the seal member is the labyrinth seal 34 has been described. However, an oil seal 41 as shown in FIG. 8 may be used instead of the labyrinth seal 34 as necessary. The oil seal 41 includes a metallic ring frame 44 with two flanges 42 and 43 projecting from the inner periphery thereof, and L-shapes attached to the side surfaces of the flanges 42 and 43 and the inner periphery of the ring frame 44. And ring-shaped sealing members 45 and 46 having a cross section.

  Further, seal lips 45a and 46a are connected to portions of the ring-shaped sealing materials 45 and 46 facing the ring holes 47 and 48 forming the flanges 42 and 43, respectively. Inside these seal lips 45a, 46a, ring-shaped springs 49, 50 are mounted for maintaining the elasticity of the seal lips. Accordingly, the springs 49 and 50 bring the seal lips 45a and 46a into contact (seal) with a predetermined pressure to the peripheral surface of the screw conveyor drive shaft 26 penetrating the ring holes 47 and 48. Thereby, it is possible to reliably prevent liquid such as oil from leaking out of the ring frame 44 through the ring holes 47 and 48.

  The oil seal 44 is suitable for sealing a liquid such as oil, but due to its nature, it cannot be divided into two like the labyrinth seal 34. Accordingly, the oil seal is moved along the screw conveyor drive shaft 26 as described above for cleaning.

Thus, the seal structure of the screw conveyor drive shaft according to the present embodiment is as follows.
A motor mounting plate (motor supporting member) 28 that supports the motor 25, and a predetermined space G with respect to the motor mounting plate 28, and supports one end of the cylindrical body 17 constituting the screw conveyor 11 together with the screw 18. An end plate (conveyor support member) 20, a screw conveyor drive shaft 26 that is driven by the motor 25, passes through the end plate 20 and is connected to the end of the screw shaft 18 a of the screw 18, and the end plate 20 A seal is provided between a shaft through hole (through hole) 27 of the provided screw conveyor drive shaft 26 and the screw conveyor drive shaft 26, and axial movement is possible around the screw conveyor drive shaft 26. The installed sealing member 34, the shaft through hole 27 provided in the end plate 20 and the screw A rotary hook member (seal member holding piece) 35 held at a sealing position with the drive shaft 26 for the bearings, and an operation of holding and releasing the holding of the seal member 34 by the rotary hook member 35 in the space G. And an operation lever 38 for performing the operation.

  Accordingly, the operating lever 38 is rotated when the screw conveyor 11 is stopped, and the holding of the sealing member 34 by the rotating hook member 35 is released, so that the sealing member 34 moves along the screw conveyor drive shaft 26. It can move in the axial direction. As a result, the opposing portion of the screw conveyor drive shaft 26 and the shaft through hole 27 provided in the end plate 20 for supporting the conveyor through which the screw conveyor drive shaft 26 is exposed is exposed to the outside. The peripheral surface of the screw conveyor drive shaft 26 at the part that has been broken can be easily washed using a washing machine or the like, and this can be reliably performed with a simple configuration.

  In addition, since the labyrinth seal 34 can be divided into two in the circumferential direction, the labyrinth seal 34 can be separated from the screw conveyor drive shaft 26, and the labyrinth seal 34 can be easily and individually cleaned. It will surely be possible.

The seal structure of the screw conveyor drive shaft according to the present invention includes a clearance between the screw conveyor drive shaft and a through-hole for passing through the screw conveyor drive shaft provided on the end plate, and cleaning of a seal member that seals the gap. Is useful for a seal structure of a drive shaft for a screw conveyor used for conveying powder such as food and pharmaceuticals.

DESCRIPTION OF SYMBOLS 11 Screw conveyor 12 Support stand 13 Wheel 14 Base 15 Conveyed material input hopper 16 Conveyed material discharge port 17 Cylinder 18 Screw 18a Screw shaft 18b Screw blade 19 Flange 20 End plate (Conveyor support member)
21 Bolt hole 22 Mounting hole 23 Bolt 24 Coupler 25 Motor 26 Screw conveyor drive shaft 27 Shaft through hole (through hole)
28 Motor mounting plate (motor support member)
29 Through-hole 30 Seal packing 31 Spacer 32 Bolt 33 Notch 34 Labyrinth seal (seal member)
35 Rotating hook member (seal member holding piece)
36 Screw hole 37 Screw shaft 38 Operation lever G Space

Claims (3)

A motor support member for supporting the motor;
A conveyor support member that is disposed with a predetermined gap with respect to the motor support member and supports one end of a cylindrical body that constitutes a screw conveyor together with a screw;
A screw conveyor drive shaft driven by the motor and penetrating the conveyor support member and connected to the screw shaft end of the screw;
A seal mounted between the through hole of the screw conveyor drive shaft provided in the conveyor support member and the screw conveyor drive shaft and mounted so as to be axially movable around the screw conveyor drive shaft Members,
A seal member holding piece for holding the seal member at a seal position between the through hole provided in the conveyor support member and the screw conveyor drive shaft;
An operation lever for holding and releasing the seal member by the seal member holding piece in the gap;
A seal structure for a drive shaft for a screw conveyor.   2. The seal structure for a screw conveyor drive shaft according to claim 1, wherein the seal member is a labyrinth seal.   The seal structure of the drive shaft for a screw conveyor according to claim 1, wherein the seal member is a labyrinth seal combined so as to be split in two in the circumferential direction.

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