JP3059336U - Screw conveyor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a screw conveyor capable of completely cleaning and removing powders and granules within a limited time. A screw conveyor for transferring a granular material by giving a rotational drive to one end of a screw, wherein the screw transfers a rotary drive shaft connected to a drive source and the granular material. And a connecting bolt 9 provided at the drive-side end of the screw shaft 10 is inserted through a through hole 8 provided in the rotary drive shaft 7 to drive the rotary drive shaft 7. At the side end, it is detachably connected,
The non-connection side ends 12, 12 of the rotary drive shaft 7 and the screw shaft 10 are supported by bearings 11, 11, respectively.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a screw conveyor used for transferring and supplying a powder or granular material such as a synthetic resin from a storage tank to a mixer or a molding machine.

[0002]

[Prior art]

 As shown in FIGS. 4 and 5, a conventional screw conveyor has a supply port 32 for powder and granular material on a central upper wall of a casing 31 of the screw conveyor and a discharge port 33 for powder and granular material on one end bottom wall. The transfer unit 35 of the granular material by the screw shaft 34 is formed in a substantially cylindrical shape concentric with the screw shaft 34 and surrounding the screw shaft 34. The screw shaft 34 has both shaft ends 36, 36 supported by bearings 38, 38 mounted at both ends of the casing 31 via flanges 37, 37, and an oil seal 39 inside these. It is buried and prevents the powder and granules in the transfer section 35 from leaking out without hindering the rotation of the screw shaft 34. Since one shaft end 36 of the screw shaft 34 is connected to the motor 40 via the chain 41 and the sprocket 42, when the motor 40 gives a rotational motion suitable for the propulsion direction of the screw shaft 34, the supply port 32 Is transported in the transfer section 35 and discharged downward from the discharge port 33.

[0003]

[Problems to be solved by the invention]

 Conventionally, when different types of powders are switched and used on the same screw conveyor, it is necessary to completely clean the inside of the screw shaft 34 and the transfer unit 35 so that the different types of powders do not mix with each other. (Complete cleaning here means that if a different powder material after cleaning is put into the screw conveyor after cleaning, the new powder material will not be affected by the mixing of different powder material before cleaning. The state of cleaning is shown). In this screw conveyor, since the screw shaft 34 is provided in the casing 31, the working space of the transfer unit 35 is narrow, and complete cleaning is extremely difficult. Therefore, a method has been adopted in which new powder and granules are passed through the screw conveyor extra until the effects of contamination do not appear after cleaning.However, in this method, the excess powder and granules that have passed through become a defective product and the yield is reduced. Had been lowered. For complete cleaning, remove the chain 41 and sprocket 42 from one shaft end 36 of the screw shaft 34, and remove the bearing 38, flange 37, and oil seal 39 from both shaft ends 36, respectively. The screw shaft 34 is removed from the casing 31 and cleaned, and after cleaning, the screw shaft 34 is assembled in the reverse procedure. As described above, the conventional dismantling and cleaning work requires a lot of labor and time.

Accordingly, the applicant previously described Utility Model Registration No. 3044092 to transfer a screw to a rotary drive shaft connected to a drive source supported by one bearing, and a powder and granules supported by the other bearing. We proposed a screw conveyor that consists of a screw shaft and a screw drive shaft.The tip of the rotary drive shaft is inserted through the inside of the screw shaft, and the screw drive is detachably connected. Since the bolts were present in the casing even after the screw shaft was removed from the casing, they hindered the work of cleaning the granular material transfer section in the casing and spent a lot of time cleaning. In addition, since the convex joint of the rotary drive shaft and the concave joint of the screw shaft are fitted inside the casing, a large amount of labor may be required to remove the screw due to the sticking of the powder and granules, and the screw may also be attached. Because the work was invisible to the public, it was not possible to confirm that the fitting was secure and there was a case where a mounting error occurred. In addition, there was a problem that the processing cost was increased due to the difficulty in processing the non-circular through-hole provided in the screw shaft when manufacturing the screw shaft.

[0005] Accordingly, an object of the present invention is to provide a screw conveyor that can completely clean and remove powders and granules without spending much effort within a limited time.

[0006]

[Means for Solving the Problems]

 The screw conveyor of the present invention is a screw conveyor for transferring powder and granules by giving a rotational drive to one end of the screw, and for transferring the screw to a rotary drive shaft connected to a drive source and the powder and granules. And a connecting bolt provided at the drive-side end of the screw shaft is inserted through a through-hole provided at the rotary drive shaft, and is removable at the drive-side end of the rotary drive shaft. And the non-connection-side ends of the rotary drive shaft and the screw shaft are supported by respective bearing portions.

In this screw conveyor, the connecting bolt also has a connecting portion having a non-circular cross section and a screw portion at the tip portion, and the rotary drive shaft forms a concave joint at the drive side end portion, and the connecting portion has the concave portion. A drive transmission block provided with a through hole having a peripheral surface shape that forms a pair with the drive transmission block.When the connection bolt is inserted into the rotary drive shaft, the connection portion is inserted into the through hole of the drive transmission block. It is preferable that the connection bolt is connected to the drive-side end of the rotary drive shaft by screwing a nut to the tip of a screw portion protruding out of the machine.

[0008]

[Embodiment of the invention]

 Hereinafter, an embodiment of the screw conveyor of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the entire screw conveyor, FIG. 2 is a vertical sectional view of the screw conveyor, (a) is an overall view, and (b) is a partially enlarged view in a circle of (a). FIG. 3 is an exploded perspective view of the screw as viewed from the back side.

The casing 1 of the screw conveyor has a substantially cylindrical shape containing a screw 2, and has a supply port 3 for powder and granular material at a central upper wall, and a powder and granular material at an end bottom wall at a non-driving side. Each of the discharge outlets 4 is opened, and a transfer section 5 for the granular material is formed inside the screw 2 along the inside. The screw 2 has a rotary drive shaft 7 connected to a drive source 6 such as a motor, and a screw shaft in which a connection bolt 9 provided at a drive end thereof is inserted into a through hole 8 along the axis. It consists of 10. Numerals 11 and 11 denote bearing portions for rotatably supporting the end portions 12 and 12 of the rotary drive shaft 7 and the screw shaft 10 on the non-connection portion side, respectively, and flanges 13 and 13 for covering these. The rotary drive shaft 7 and the screw shaft 10 are arranged near the boundary between the rotary drive shaft bearing 11 and the granular material transfer section 5 and are provided with a seal 14 for preventing the granular material from leaking (see FIG. 3). The tip of the connecting bolt 9 (a screw portion 22 described later) penetrates the rotary drive shaft 7 and protrudes outside the machine.

The connecting bolt 9 has a connecting portion 21 having a non-circular cross section and a screw portion 22 at the distal end, and a tapered portion 23 is provided at the base connected to the screw shaft 10. On the other hand, the rotary drive shaft 7 forms a concave joint 24 at the drive side end thereof, and a drive transmission block 26 having an inner surface through hole 25 which is paired with the outer peripheral surface of the connecting portion 21 is mounted on the concave joint 24. . Accordingly, when the connecting bolt 9 is inserted into the through hole 8 of the rotary drive shaft 7, the outer peripheral surface of the connecting portion 21 is joined to the inner peripheral surface of the through hole 25 of the drive transmission block 26. When the nut 28 is fixed to the screw portion 22 via the spacer collar 27, the screw shaft 10 and the rotary drive shaft 7 are connected and fixed so as to be detachable and not to rotate relative to each other.

In the screw conveyor according to the present invention, when switching between different types of powders and granules, first, a nut 28, a spacer collar 27, and a drive transmission block 12 are sequentially provided from the screw portion 22 at the tip of the connecting bolt 9. After removal, the flange 13 on the discharge port 4 side is removed from the casing 1, and the screw shaft 10 is connected with the screw shaft 10 while the flange 13, the bearing portion 12 and the oil seal (not shown) are mounted. It is sufficient to pull out the bolt 9 from the rotary drive shaft 7 and take it out. If the assembly is performed in the reverse procedure after cleaning, the granular material can be completely cleaned and removed within a limited time.

[0012]

【Example】

 The disassembly and assembly time of the screw conveyor shown in FIG. 1 provided with a screw having an outer diameter of 125 mm and a length of 1200 mm was compared with a conventional screw conveyor. The screw conveyor of the present invention requires about 5 minutes for one worker, and the conventional screw conveyor requires about 30 minutes for two workers, and the screw conveyor of the present invention requires more time than the conventional one. It was shortened by 1/12.

[0013]

[Effect of the invention]

 According to the screw conveyor of the present invention, when the screw shaft is removed from the casing, only the flange connected via the oil seal and the bearing is removed from the end on the non-drive side, so that the rotary drive shaft and the screw are removed. Since the shaft can be easily separated, the rotary drive shaft side does not need to be disassembled at all, and the powder and granular material can be completely cleaned and removed within a limited time; bolts for connecting the rotary drive shaft and the screw shaft Is connected to the connecting part of the connecting bolt and the drive transmission block mounted on the concave joint of the rotary drive shaft into the through hole, so that the rotational motion transmitted from the motor to the rotary drive shaft is Can be smoothly transmitted to the screw shaft without slipping on each other. Fastening with a nut on the thread of the connecting bolt prevents both shafts from coming off during rotation, The joint surface between the screw shaft and the rotary drive shaft can be brought into close contact with each other via a seal for preventing leakage. Since the tapered portion is provided at the base of the connection bolt of the screw shaft, the connection bolt is connected to the rotary drive shaft. When the screw is inserted into the through-hole, it plays a role of guiding the connecting bolt into the through-hole, so that the deviation of the axis between the screw shaft and the rotary drive shaft can be corrected smoothly. To play.

[Brief description of the drawings]

FIG. 1 is a plan view showing the whole screw conveyor of the present invention.

FIG. 2 is an explanatory longitudinal sectional view of the screw conveyor shown in FIG. 1, wherein (a) is an overall view thereof, and (b) is a partially enlarged view in a circle of (a).

FIG. 3 is an exploded perspective view of a screw of the screw conveyor shown in FIG.

FIG. 4 is a plan view showing the entire conventional screw conveyor.

5 is a longitudinal sectional view of the screw conveyor shown in FIG.

[Explanation of symbols]

1 ‥ casing, 2 ‥ screw, 3
‥ Supply port, 4 ‥ Discharge port, 5 ‥ Transfer section,
6 ‥ drive source, 7 ‥ rotary drive shaft, 8 ‥
Through holes, 9mm connection bolts, 10mm screw shafts, 11mm bearings, 12mm non-joint side ends, 13mm flanges, 14mm seals. 21 ‥ connection, 22 ‥ thread, 23 ‥ taper, 24 ‥ concave joint, 25 ‥ through hole,
26 ‥ drive transmission block, 27 ‥ spacer collar,
28 ‥ nut. 31 ‥ casing, 32 ‥ inlet, 33 ‥ outlet, 34 ‥ screw shaft,
35 ‥ transfer section, 36 ‥ shaft end, 37 ‥ flange,
38 ‥ bearing, 39 ‥ oil seal, 40 ‥ motor, 41 ‥ chain,
42 ‥ sprocket.

Claims (2)

[Utility model registration claims] 1. A screw conveyor for transferring a granular material by giving a rotational drive to one end of a screw, the screw comprising a rotary drive shaft connected to a drive source and a screw for transferring the granular material. And a connecting bolt provided at the drive-side end of the screw shaft is inserted into a through-hole provided at the rotary drive shaft, and is detachably connected at the drive-side end of the rotary drive shaft. A screw conveyor wherein the non-connection side ends of the rotary drive shaft and the screw shaft are supported by respective bearing portions. 2. A connecting bolt having a connecting portion having a non-circular cross section and a screw portion at a tip portion, a rotary drive shaft forming a concave joint at a driving side end portion, and forming a pair with the connecting portion. A drive transmission block provided with a through hole having a peripheral surface shape is mounted, and when the connection bolt is inserted into the rotary drive shaft, the connection portion is inserted into the through hole of the drive transmission block and protrudes outside the machine. The screw conveyor according to claim 1, wherein the connection between the connection bolt and the drive-side end of the rotary drive shaft is performed by screwing a nut to a tip of the formed screw portion.