JPH03885B2 - - Google Patents

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 caught in a bar screen installed in a waterway in a water or sewage treatment plant or the like. It is related to the device.

[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 rags and wood chips. A dust remover is generally used, which removes the screen residue using a bar screen or the like, and mechanically scrapes and removes the captured screen residue using a rake.

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

A dust removal screen 13 is provided in the waterway W, and along this dust removal screen 13, a pair of endless chains 1 are stretched between upper and lower chain foils 14 and 15, respectively, with appropriate intervals between the endless chains 1, A plurality of rakes 2 are attached, and the rakes 2 touch the dust removal screen 13 and rise along the guide rail 11, and the rakes 2 remove dust from the dust removal screen.

The chain take-up device in such a dust remover is constructed as shown in FIGS. 14 and 15.

That is, FIGS. 14 and 15 are a plan view and a side view of a conventional take-up device.

In FIGS. 14 and 15, the take-up device in the dust remover mentioned above is connected to the upper sprocket 1.
A bearing 17 is fitted to the drive shaft 16 of the upper casing, the bearing 17 is supported by a housing 19 fitted with a 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 Screw the spindle nut 23 onto the spindle 18 and attach 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 the scale 2
A spindle cover 26 with a numeral 5 on it is fixed to and covers the spindle nut 23. chain 1
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, since the chain 1 is wound endlessly between the upper and lower sprocket wheels 14 and 15, and the lower sprocket wheel 15 is underwater, it is not possible to visually judge the slackness of the chain 1, and the next time If chain 1 sag more than expected before the inspection, chain 1 will be removed from lower sprocket wheel 1.
5, causing damage to the dust remover and a stoppage accident. On the other hand, due to the arrangement of the dust remover, if the length of the chain is particularly long, it is necessary to increase the tension of the chain, and the above-mentioned chain tensioning device is insufficient for maintenance.

As mentioned above, increasing the frequency of inspections to prevent accidents caused by slack in the chain 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, in a dust remover that uses a rake attached to a chain to scrape up solid foreign matter caught on a dust removal screen installed in a waterway, To provide an automatic take-up device for a dust remover that automatically absorbs slack, tensions the chain, prevents the chain from coming off the sprocket wheel, maintains the chain, and saves labor. This is the purpose.

[Summary of the invention]

The present invention was made to improve the take-up device in the dust remover as described above, and its gist is that the take-up device is installed between upper and lower chain wheels along the dust removal screen installed in the waterway. The dust remover has a rake which is attached at both ends to a pair of endless chains and which rises in contact with the screen, and which removes screen debris by the rake, and a rotatable tension member is provided on both of the return side chains. A displacement detector is provided for detecting displacement of the rotatable tension member, which is formed by pressing and expanding an inner return rail of the pressing part, and a take-up device is driven and controlled by a signal from the displacement detector. The automatic take-up device for a dust remover is further characterized in that (1) the take-up device includes a pair of hydraulic jacks placed between a lower part of the housing in which the spindle is mounted and a frame of the dust remover; A 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. This includes an automatic take-up device for a dust remover, which is screwed into a bevel gear with a threaded hole provided therein, connected to a drive shaft of an electric motor with a trilimiter via the bevel gear or worm gear, and adjusting the spindle by the electric motor. .

[Embodiments of the invention]

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

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 represents the maximum allowable sagging 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. A weight 33 made of a steel shell filled with concrete or the like inside is fixed to an arm shaft 39 of the rotatable tension member 30 .

When chain 1 is in a normal state with no slack,
The reaction force R generated by the weight W of the weight 33 and the tension of the chain are balanced, and the center of the freely rotatable tension member 30 is located at the point X, and is freely rotatable when the chain is at the maximum allowable sagging amount δ. The center of the tension member 30 is at the Y position, the chain 1 is pressed by the weight of the weight 33, the chain 1 moves along the return side rail 38, and the displacement amount of the chain 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 shape is preferable.

Next, in another embodiment of the chain tensioning device used in the present invention, the weight 33 is not attached to the rotatable tensioning member 30, and the weight arm 3 is attached to the fulcrum shaft 36 of the weight arm.
5A, and a weight 33A as described above is mounted on the tip of the weight 35A, but the same effect is obtained in this case as well. The weight 33 also has the same effect on a sprocket.

Furthermore, the chain tensioning device used in the present invention will be explained with reference to FIGS. 3 and 4.

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 may be loaded on the arm shaft 39, or the weight arm 35A may be fixed to the weight arm fulcrum shaft 36, and the weight 33A may be mounted on the tip of the weight arm 35A. Although the present invention is achieved, it is mounted on both of the above-mentioned locations, and the latter 33A
By making the weight 33B heavier and the former weight 33B lighter, the load on the chain in its normal state is reduced, and as a result, the chain is protected and its lifespan is extended.

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, take-up spindle 1
Hydraulic jacks 41, 41' are provided in the space 60 between the lower part of the housing 19, 19' where the dust remover frame 20 and the dust remover frame 20 are installed.
42 is a small hydraulic pump unit, 43 is a pressure regulating valve, and 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, 4 are used.
1' is used to perform take-up using a small hydraulic pump unit 42. The small hydraulic pump unit 42 is driven by the aforementioned limit operation and stops when the pressure of the pressure regulating valve 43 set in advance is reached.

Furthermore, FIG. 7 is a schematic diagram for explaining another embodiment of the take-up device used in the present invention,
FIG. 8 shows cross section A in FIG. 7.

7 and 8, 51 and 51' are bevel gearboxes, 52 is a branched bevel gearbox or worm gearbox, 53 is a motor with a torque limiter, 54 is a pedestal provided on the frame 20, 55 is a retainer, and 56 is a Pedestal 54
The nut 57 for fixing the frame 20 to the frame 20 is also a bolt. A bevel gear 521 with a screw hole is mounted on the bearing metal 5 on the pedestal 54 and the retainer 55.
23, and a bevel gear 52.
1 is screwed with a take-up spindle 18. 522 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, which operates the take-up spindles 18 and 18' via the branch bevel gear box 52, the bevel gear 522 in the bevel gear box 51, and the bevel gear 521, and adjusts the tension of the chain 1. , the torque limiter operates at a set torque corresponding to the appropriate chain tension, and the torque limiter-equipped motor 53 stops.

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 pressing part, thereby controlling the displacement of the rotatable tension member 30. Automation is achieved by cleverly connecting the chain tension 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 an electric motor with a torque limiter.

Next, a displacement detecting device for a rotatable tension member will be described with reference to FIGS. 9 to 11. Fig. 9 is a chain slack detection device, Fig. 10 is a side view of limit switch installation, Fig. 11 is a view taken along arrow A-A in Fig. 9, and Fig. 12 is a block diagram for explaining the control mechanism. be. 9 to 12, 40 is a limit striker, 58 is a limit switch, 61 is a mounting bracket for the limit switch 58, 62 is a striker lever, 3
6 indicates the weight arm fulcrum axis.

Next, the operation of the automatic take-up device of the present invention will be described. Chain 1 due to the weight of weight 33
is pressed, the chain moves along the inner return rail, and chain 1 is displaced. In this case, the amount of displacement is set in advance, and when the amount of chain slack increases, the arm descends and hits the limit when the amount exceeds the set value, stopping the dust remover.
A limit switch 58 is provided on the main body of the dust remover, and the above-mentioned take-up device is automatically activated by the output signal of the limit switch 58.

In other words, the above-mentioned state where there is no slack in chain 1 (X
The point corresponding to the displacement Z of the difference between the chain position (point Y) at the chain maximum allowable slack amount δ is replaced with the distance h between the limit striker and the striker lever.

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

In this case, the weight arm 35A descends when the rotational tension member displacement amount Z exceeds the set value, and the limit switch 5 is activated by the limit striker 40.
8, the limit striker 40 moves from position b to position c. This also allows the dust remover to be stopped. At the same time limit switch 58
The output signal is input to the hydraulic pump operating mechanism of the take-up device or a motor with a torque limiter, the hydraulic pump or electric motor is driven, and the take-up spindle is operated by a hydraulic jack or transmission gear to automatically adjust the tension of chain 1. be.

〔Effect of the invention〕

The automatic take-up device of the dust remover as described above constantly presses the chain tension with a rotatable tension member, prevents the chain from coming off the lower sprocket, and controls the amount of displacement of the rotatable tension member. The chain can be taken up automatically by hydraulic or electric power when the preset value is exceeded, making it extremely easy to maintain the dust remover.
This is a useful device that is efficient 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. 5 is a schematic diagram for explaining the take-up device of the present invention, FIG. 6 is a view taken in the direction of arrow A in FIG. 5, FIG. 7 is a diagram showing an example of another embodiment of the take-up device, and FIG. , FIG. 9 is a plan view of the chain slack detection device according to the present invention, FIG. 10 is a side view showing the limit switch attachment, FIG. 11 is a view taken along the line A-A in FIG. 9, and FIG. FIG. 13 is a schematic side view of a dust remover, and 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 same reference numerals in 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, 11,1
1'...Guide rail, 12...Chain roller,
13...Dust removal screen, 14...Upper sprocket foil, 15...Lower sprocket foil, 1
6... Drive shaft, 17... Bearing, 18, 18'...
Take-up spindle, 19, 19'...housing, 20...frame, 21...hole, 22...
...Lock nut, 23...Spindle nut,
24...Opening, 25...Scale, 26...Spindle cover, 27...Take-up drive motor,
28...Take-up sprocket foil, 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...
...Fully shaft of weight arm, 38...Inner return lane, 39...Arm axis, 40...Limit striker, 41, 41'...Hydraulic jack, 42...
... Hydraulic pump unit, 43 ... Pressure regulating valve, 5
1, 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, 52
2...Bevel gear, 523...Bearing metal, 58
...Limit switch, 60...Space part, 61...
...Bracket, 62...Striker lever.

Claims (1)

[Claims] 1. Along the dust removal screen provided in the waterway,
A dust remover having a rake whose both ends are attached to a pair of endless chains stretched between upper and lower chain foils and which rises in contact with the screen, and which removes screen residue with the rake,
A rotatable tensioning member is pressed on both of the return side chains, an inner return rail of the pressing portion is bent, and a displacement detector is provided to detect 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 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, and the An automatic take-up device for a dust remover according to claim 1, characterized in that the connecting pipe is provided with a pressure regulating valve. 3. The take-up device has a pair of spindles,
Claim 1, which comprises screwing together a bevel gear with a threaded hole provided on a lower pedestal of the housing, connecting it to a motor drive shaft with a torque limiter via the bevel gear or worm gear, and adjusting the spindle by the motor. Automatic take-up device for dust remover.