JPS6149012A - Automatic takeup device for dust remover - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a take-up device for a dust remover that scrapes up and removes screen residue captured by a bar screen installed in a waterway in a water or sewage treatment plant or the like. It is related to.

[Prior art]

In order to prevent clogging of plant pipes, valves, nozzles, etc. and pump failure, waterways that take water into water and sewage treatment plants are equipped with dust removal screens to prevent large solid foreign objects such as wood chips and wood chips. A dust remover is generally used that removes the screen residue using a bar screen or the like, and mechanically scrapes up and removes the captured screen residue using a scraper.

The outline of this dust remover is shown in FIG. 13 as follows.

A dust removal screen 13 is installed in the waterway (W), and upper and lower chain foils 1 are installed along the dust removal screen 13 in B.
4. A pair of endless chains >' 1 is stretched between the endless chains 1, and a plurality of rakes 2 are attached to the endless chains 1 at appropriate intervals, and the rakes 2 are in contact with the dust removal screen 13 and run along the guide rail 11. The dust removal screen scum is removed by the rake 2.

In a dust remover, the chain take-up device is the first
The configuration is as shown in Figures 4 to 15.

That is, FIGS. 14 and 15 are a plan view and a side view of a conventional taper tube device.

In FIGS. 14 and 15, the take-up device in the above-mentioned dust remover is connected to the drive shaft 16 of the upper sprocket 14.
The bearing 17 is supported by the housing 19 fitted with the take-up spindle 18, the take-up spindle 18 is passed through the hole 21 provided in the frame 20 of the upper casing, and the lock nut 22 and the spindle nut 23 are inserted. Screw it onto the spindle 18 and connect it to the spindle 1.
The chain 1 is stretched by fixing the chain 8 to the frame 20. The head of the take-up spindle 18 has an opening 24 through which the head can be seen, and is covered with a spindle cover 26 on which a scale 25 is displayed and fixed to the spindle nut 23. When checking the tension of the chain 1, loosen the lock nut 22, turn the spindle nut 23 with a torque wrench to perform take-up work on the chain 1, and fix the spindle 18 to the frame 20 with the lock nut 22. The take-up at this time is confirmed by the scale 25 of the scale plate displayed on the side edge of the opening 24 of the spindle cover 26. In addition, the chain 1 is wound endlessly between the upper and lower sprocket wheels 14 and 15, and the lower sprocket wheels 14 and 15 are underwater, so it is impossible to visually determine the slack in the chain 1. If the chain 1 sag more than expected before the inspection, the chain 1 will come off the lower sprocket wheel 15, causing damage to the dust remover and a stoppage accident. On the other hand, due to the arrangement of the dust remover (L'), if the length of the chain is particularly long, it is necessary to increase the tension of the chain, and in terms of maintenance, the chain tensioning device described above is insufficient.

As mentioned above, increasing the frequency of inspections to prevent accidents caused by chain slack would require a great deal of effort for take-up work using a torque wrench. There was a demand for the development of a similar chain tensioning device.

[Purpose of the invention]

The present invention has been made in response to the above-mentioned needs, and as described above, is a dust remover that is installed in a waterway and uses a rake attached to a chain to scrape up solid foreign matter captured by a dust removal screen. To provide an automatic take-up device for a dust remover that automatically absorbs slack in a dust remover, tensions the chain, prevents the chain from coming off a sprocket wheel, maintains the chain, and saves labor. The purpose is to

[Summary of the invention]

The present invention was made with the aim of improving the take-up device in the above-mentioned dust remover, and its gist is that the take-up device installed in the waterway is
In a dust remover, a rake is attached at both ends to a pair of endless chains stretched between upper and lower chain wheels, and rises in contact with the screen, and the rake removes screen dregs. A displacement detector is provided by pressing a rotatable tensioning member on both sides of the chain and expanding an inner return rail of the suppressing portion, and detecting displacement of the rotatable tensioning member. An automatic take-up device for a dust remover, characterized in that the take-up device is driven and controlled by a signal from a A pair of hydraulic jacks is mounted, the pair of hydraulic jacks and a small hydraulic pump are connected by a connecting pipe, and a pressure regulating valve is provided in the connecting pipe, (2) the take-up device is 1 Dust removal comprising screwing the anti-spindle with a bevel gear with a threaded hole provided on a pedestal at the top of the frame, connecting it to a motor drive shaft with a torque limiter via the bevel gear or worm gear, and adjusting the spindle with the motor. This includes the machine's automatic take-up equipment.

[Embodiments of the invention]

Next, an embodiment of the present invention will be explained based on the drawings. 1st
Figures 1 and 2 show an embodiment of a chain tensioning device for a dust remover, in which a rotatable tensioning member is pressed against both return side chains and the inner return rail of the pressing part is expanded. FIG.

1 and 2, 30 is a rotatable tension member (take-up drum), 31 is a driven roller, 33 is a weight, 35B is a rotatable tension member arm, 35A is a weight arm, and 36 is a rotatable tension member arm. The fulcrum axis of the weight arm, 38 is the inner return rail, 39 is the arm axis, W is the weight of the weight 30, R is the reaction force, and δa is the maximum allowable shape of the chain.

Next, we will discuss the operation.

The rotatable tension member 30 freely rotates and presses the chain 1 about the fulcrum shaft 36 of the weight arm, and the driven roller 31 receives the chain 1. Rotatable tension member 3o
For example, there is a weight made of an iron shell with concrete filled inside! 33 is fixed to the arm shaft 39.

When Cheno 1 is in a normal state with no slack, the weight is 33.
The reaction force R generated by the weight W of the chain balances with the tension of the chain, the center of the freely rotatable tension member 30 is located at point The center is at the Y position, and the weight of the weight 33 presses the cheno 1, causing the cheno 1 to move along the return side rail 38.
moves, and the displacement amount of Cheno becomes Z. The present invention is characterized in that this amount of displacement is detected and this output signal is utilized.

If the shape of the weight 33 is circular, it may collide with the tips of the teeth of the rake 2, so a circular hole shape is preferable.

Next, in the case of another embodiment of the chain tensioning device used in the present invention, the weight arm 35A is fixed to the fulcrum shaft 36 of the weight arm without adding the weight 33 to the freely rotatable tensioning member 3o, and the weight 33 is fixed to the fulcrum shaft 36 of the weight arm.
A weight 33A as described above is mounted on the tip of the weight 5A, but the same effect can be obtained in this case as well. Further, the weight 33 can have the same effect even if it is a sprocket.

Furthermore, the chain tensioning device used in the present invention is shown in FIGS. 3 and 4.
This will be explained using figures.

3 and 4 are a side view and a plan view, respectively, of the chain tensioning device, showing the position of the rotatable tensioning member when the limit is activated.

In this case, the weight 33B is loaded onto the arm shaft 39tζ, or the weight arm 35A is fixed to the weight arm fulcrum shaft 36, and the weight 33A is mounted on one end of the tip 8 of the weight arm 35A. However, the present invention can be achieved by mounting the rack at both of the above-mentioned locations, making the latter weight 33A heavier and the former weight 33B lighter, thereby reducing the load on the chain in its normal state, and as a result protecting the chain. It also has a longer lifespan.

Next, the chain is taken up by the take-up device according to the amount of displacement of the rotatable tension member 30, and an embodiment thereof will be described with reference to the drawings.

FIGS. 5 and 6 are a schematic diagram and a view taken along arrow A, showing an embodiment of the take-up device used in the present invention.

In Fig. 5, the take-up spindle 18°18'
A hydraulic jack 41. is installed in the space 60 between the lower part of the housing 19.
41' is provided, 42 is a small hydraulic pump unit, and 43 is a pressure regulating valve.

44 is a connecting pipe between the pair of hydraulic jacks 41, 41' and the small hydraulic pump 42.

The operation of the device based on FIG. 5 will be described.

For take-up operation of the take-up spindles 18, 18', hydraulic jacks 41, 41' are used and a small hydraulic pump unit 42 is used to perform the take-up. The small hydraulic pump unit 42 is driven by the above-mentioned limit operation and stops when the preset pressure of the pressure regulating valve 43 is reached.

Furthermore, FIG. 7 is a schematic diagram for explaining another embodiment of the take-up device used in the present invention, and FIG. 8 is a cross-sectional view taken along line A in FIG. 7.

7 and 8, 51 and 51' are bevel gear boxes, 52 is a branched bevel gear box or worm gear box, 53 is a motor with a torque limiter,
54 is a pedestal provided on the frame 201-, 55 is a retainer, 56 is a nut for fixing the pedestal 54 to the frame 20, and 57 is a bolt. A bevel gear 521 with a threaded hole is provided on the base 54 and the retainer 55 via a bearing metal 523, and the take-up spindle 18 is screwed into the bevel gear 521. 52
2 is a bevel gear for transmitting the drive of the motor 53 with a torque limiter.

The operation of the device based on the above configuration will be described. The aforementioned limit operation drives the motor 53, and the branch bevel gear box 52. Bevel gear 522 in bevel gear box 51. The take-up spindles 18 and 18' are operated via the bevel gear 521, the tension of the chain 1 is adjusted, and the torque limiter is activated at a set torque corresponding to the appropriate chain tension, and the motor 53 with torque limiter is stopped. It is something.

As explained above, the present invention presses the rotatable tension member 30 on both sides of the return side chain 1, and expands the inner return rail of the suppression portion, thereby controlling the displacement of the rotatable tension member 30. Automation is achieved by cleverly connecting the chain tensioning device for detection and the take-up spindle with a combination of a hydraulic jack and a small hydraulic pump unit, or a take-up device using a torque limiter and multiple machines.

Next, a displacement detecting device for a rotatable tension member will be described with reference to FIGS. 9 to 11. Figure 9 is a chain slack detection device, Figure 10 is a side view of limit switch installation,
FIG. 11 is a view taken along arrow A-A in FIG.
The figure is a block diagram for explaining the control mechanism. 9th
In Figures to Figures 12, 40 is the limit striker 25
8 is a limit switch, 61 is a bracket for mounting the limit switch 58, 62 is a striker lever, and 36 is a weight arm fulcrum shaft.

Next, the operation of the automatic take-up device of the present invention will be described. The chain 1 is pressed by the weight of the weight 33, moves along the inner return rail, and is displaced. In this case, the amount of displacement is set in advance, and if the amount of strain on the chain becomes large, the arm descends and hits the limit when the set value is exceeded to stop the dust remover. There is also a limit switch 58 on the side of the dust remover body. The output signal automatically operates the aforementioned take-up device.

In other words, the point corresponding to the displacement Z of the difference between the chain 1 without slack (one point X12) and the chain position (Y point) at the maximum allowable chain slack amount δ is determined by the distance between the limit striker and the striker lever 1II ( h).

In FIG. 10, a indicates the limit switch operating position, b indicates the limit striker position corresponding to point X, and C indicates the limit striker maximum movement position corresponding to seven chain positions at the maximum allowable chain slack amount δ.

In this case, the weight arm 35A descends when the amount of displacement of the rotatable tension member exceeds the set value Z, and the limit striker 40 strikes the limit switch 58, causing the limit striker 40 to move from position B to position C. do. This also allows the dust remover to stop. At the same time, the output signal of the limit switch 58 is input to the hydraulic pump operating mechanism or torque limiter motor of the take-up device, the hydraulic pump or electric motor is driven, and the take-up spindle is operated by the hydraulic jack or transmission gear to automatically tension the chain 1. This will be adjusted accordingly.

〔Effect of the invention〕

The automatic take-up device of a dust remover such as a tilt-up machine constantly presses the chain tension with a rotatable tension member, prevents the chain from coming off the lower sprocket, and predetermines the amount of displacement of the rotatable tension member. When the set value is exceeded, chain take-up can be automatically performed hydraulically or electrically, making it a useful device that is extremely efficient in maintaining the dust remover and can save labor.

[Brief explanation of the drawing]

1 to 2 are a side view and a plan view of an embodiment of the chain tensioning device according to the present invention, and FIGS. 3 and 4 are a side view and a plan view of another embodiment of the chain tensioning device, respectively. FIG. 5 is a schematic diagram for explaining the take-up device of the present invention, FIG. 6 is a view taken along the arrow A in FIG. 5, and FIG. 7 is a view taken along the arrow A-A in FIG. 9. , 12th
The figure is a control block diagram, Figure 13 is a schematic side view of the dust remover,
FIGS. 14 and 15 are a plan view and a side view, respectively, of a take-up device in a conventional dust remover. Note that the symbols in the middle of each figure indicate the same or corresponding parts. In the drawings, 1...Chain, 2...Rake, 3
...Arm, 5...Chain attachment, 6.
... Side plate, 7... Side plate roller, 9... Arm roller, 10... Arm stopper, 11, 11'... Guide rail, 12... Chain roller, 13... Dust removal screen, 14... Upper sprocket foil, 15
... Lower sprocket wheel, 16 ... Drive shaft, 1
7... Bearing, 18° 18'... Take-up spindle, 19.19'... Housing, 20... Frame, 21... Hole, 2219. Rocknut, 23...
Spindle nut, 24... Opening, 25... Scale, 26... Spindle cover, 27... Take-up drive motor, 28... Take-up sprocket wheel, 29... Take-up chain roller, 30...・
- Rotatable tension member, 31... Followed roller, 33 - Weight or sprocket, 35B... Arm of rotatable tension member, 35A... Weight arm, 36 - Fulcrum shaft of weight arm, 38・Inner return lane, 39...arm axis,
40. Limits 1-Riker, 41.41'
・Hydraulic jack, 42...Hydraulic pump unit, 43
Pressure regulating valve, 51° 51', bevel gear box, 52
・Branch bevel gear or worm gear box, 5
3.--Motor with torque limiter, 54.Pedestal, 55
...retainer, 56...nut, 57...bolt,
521... Bevel gear with screw hole, 522 Bevel gear,
523...Bearing metal, 58...Limit switch, 6
0... Space, 61... Bracket, 62... Striker lever. Agent Patent Attorney Sanro Kimura Figure 13 Figure 14 of JP-A-61-490120

Claims (3)

[Claims] (1) A rake is attached at both ends to a pair of endless chains stretched between upper and lower chain foils along a dust removal screen installed in a waterway, and the rake rises in contact with the screen. In a dust remover for removing screen scum, a rotatable tension member is pressed against both return side chains, and an inner return rail of the pressing part is expanded to prevent displacement of the rotatable tension member. An automatic take-up device for a dust remover, characterized in that a displacement detector is provided for detection, and the take-up device is driven and controlled by a signal from the displacement detector. (2) A pair of hydraulic jacks is placed between the lower part of the housing in which the take-up device is attached with the spindle and the frame of the dust remover, and the pair of hydraulic jacks and the small pump are connected by a connecting pipe. 2. The automatic take-up device for a dust remover according to claim 1, wherein said connecting pipe is provided with a pressure regulating valve. (3) The take-up device screws the pair of spindles with a bevel gear with a screw hole provided on the lower pedestal of the housing, and connects the pair to a motor drive shaft with a torque limiter via the bevel gear or worm gear, and the motor drives the spindle. Claim 1 consisting of adjusting
Automatic take-up device for the dust remover described in section.