JP5715214B2 - Rake overload detection mechanism of rake arm rotary dust remover - Google Patents

Description

  The present invention is a rake arm rotary dust remover that is installed in a water channel, captures dust in the water channel with a screen, and rakes it up by an operation accompanied by a lifting operation and a rotating operation of the rake. The present invention relates to a mechanism for detecting an overload condition.

Conventionally, in sewage treatment or wastewater treatment at a sewage treatment plant or river effluent treatment plant, in order to remove waste contained in the sewage or wastewater to be treated, the flow channel is disposed so as to be blocked. A rake-type dust remover is installed, which is equipped with a rake device that arranges a screen for catching garbage, meshes with the screen, moves along the screen, and scrapes and catches the garbage collected by the screen. doing.
Some of the screens are formed by arranging a plurality of flat steel strips of the same size adjacent to each other at equal intervals and fixing the front surface of the screen to be the same surface.

  As disclosed in Patent Document 1, there is a rake device that has a configuration in which dust is lifted up by a movable rake that travels in a circulating manner, and is transported to a shooter and discharged.

  Also, in recent years, a rake dust remover using a screen for removing fine dust will be installed so that dust flowing into sewage treatment plants and river wastewater treatment plants can be removed as much as possible in consideration of post-treatment. I have to. As a rake type dust remover using this fine dust removal screen, the screen width of the screen is determined according to the size of dust that can be captured, and the rake claw of the rake device can be inserted smoothly into the screen width. The interval is set.

  As an example of the rake unit for enabling the removal of fine dust, as in the conventional examples of Patent Document 2 and FIGS. 3 and 4, the deposits such as fine dust at the bottom of the water channel are reciprocated along the screen. There is a rake unit having a rotating shaft that swings the rake tip for scraping.

  In the rake unit 200 as shown in FIGS. 3 and 4, particularly when the bottom deposit is scraped up, the rake unit 200 may collide with the deposit and may be overloaded to damage each part. Therefore, an overload detection limit switch 206 is provided in the rake unit 200, and when the rake 204 and the rake arm 202 swing in a direction opposite to the direction in which the rake is to be lifted as shown in FIG. There is a dust remover that has a mechanism for operating the limit switch 206 to stop the rake unit 200 even if it is applied. 3 is a general view of a conventional example, and FIG. 4 is a diagram showing the principle of operation of a limit switch of the conventional example.

  As another method for detecting overload, there is a method for detecting an overcurrent of an electric motor for operating the rake, determining an overload state, and stopping the rake unit.

Japanese Patent No. 3229535 Japanese Patent No. 4805210

However, in the conventional overload detection method using the limit switch of the rake unit as shown in FIGS. 3 and 4, there is a problem in durability of the movable part or the like when the limit switch is used underwater. Furthermore, since it becomes mechanical ON / OFF detection by a limit switch, there is a limit to performing fine detection setting.
Further, even in the method of detecting the overcurrent of the electric motor, a load is imposed on the electric motor every time the overcurrent occurs, so that there is a possibility that the life of the electric motor is shortened or the electric motor is damaged.

  An object of the present invention is to provide a mechanism for detecting an overload state when the rake performs a lifting operation in the rake arm rotary dust remover, so that the overload state of the rake unit can be detected with high accuracy and more durable. An object of the present invention is to provide a rake overload detection mechanism.

  The present invention has been made to solve the above-described problems, and the invention of the rake overload detection mechanism for a rake arm rotary dust remover according to claim 1 is directed to a screen installed so as to block a water channel. In the rake arm rotary dust remover, where the rake scrapes up the dust in the water along with the raising / lowering operation and rotation operation, the rake, a rake arm having one end attached to the rake and having a connecting shaft at the other end, and a rotational drive at one end A rake unit having a shaft hole for connecting the connecting shaft of the rake arm to the other end of the rake arm, and an inclination angle sensor, and a diameter of the shaft hole of the drive unit frame. Is set to be larger than the diameter of the connecting shaft, the connecting shaft is movably connected to the shaft hole, and the rake is accumulated at the bottom of the water channel by the scooping operation of the rake. When a predetermined load is applied to the rake, the connecting shaft moves inside the shaft hole of the drive unit frame to be balanced and stopped, and the rake arm is opposite to the rotation direction of the scraping operation. The tilt angle of the rake arm changes by swinging in the direction about the stop position of the connecting shaft, and the tilt angle sensor detects the tilt angle of the rake arm and the change thereof, and the change of the predetermined tilt angle occurs. The rake is determined to be in an overload state, and the rake scraping operation is stopped.

  The invention according to claim 2 is the rake overload detection mechanism of the rake arm rotary dust remover according to claim 1, wherein the tilt angle sensor is provided at a predetermined position of the rake arm. Yes.

  In the rake overload detection mechanism of the present invention, the diameter of the shaft hole of the drive unit frame of the rake unit is set larger than the diameter of the connecting shaft, and the connecting shaft is movably connected to the shaft hole. When the rake collides with the sediment at the bottom of the water channel during operation, the connecting shaft moves inside the shaft hole of the drive unit frame to balance it and stops, and the rake arm is connected to the connecting shaft in the direction opposite to the rotation direction of the scraping operation. The tilt angle of the rake arm changes by swinging around the stop position of the rake arm, and the tilt angle sensor detects the rake arm tilt angle and its change. This mechanism stops the rake scooping operation, and the tilt angle changes more significantly than when the rotating shaft does not move. Detection can be performed.

  Further, by applying the tilt angle sensor, there is an advantage that the durability is further improved because the movable part is not exposed in the water as compared with the overload detection by the conventional limit switch.

The side view of the rake overload detection mechanism of the rake arm rotary dust remover which concerns on this invention, and the principle of operation are shown. (A) and (b) show before operation of the overload detection mechanism, and (c) and (d) show when the overload detection mechanism is in operation. 1 shows a rake arm rotary dust remover having a rake overload detection mechanism of a rake arm rotary dust remover according to the present invention. (A) is a front view, (b) shows a side view. A rake arm rotary dust remover using a conventional overload detection limit switch is shown. (A) is a front view, (b) shows a side view. The principle of limit switch operation of a rake arm rotary dust remover using a conventional overload detection limit switch is shown. (A) and (b) show before limit switch operation, and (c) and (d) show when limit switch is activated.

Hereinafter, an example of an embodiment of the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a side view of a rake overload detection mechanism of a rake arm rotary dust remover according to the present invention and its operating principle. FIG. 2 shows a rake arm rotary dust remover having the rake overload detection mechanism of FIG.
1 includes a rake 24, a rake arm 22 having one end attached to the rake 24 and having a connecting shaft 23 at the other end, a rotation drive unit 25 at one end, and a rake arm at the other end. The drive unit frame 21 having a shaft hole 21 a for connecting the connection shafts 23 of the 22 and an inclination angle sensor 26 are provided. The rake unit 20 is lowered by the unit itself and the rotation drive unit 25 of the drive unit frame 21. The rake 24 is scraped up by rotating around the center of the rake 24. When the rake 24 collides with the deposit A in the lower part of the rake 24, the connecting shaft 23 is driven by the shaft of the drive unit frame 21. The inside of the hole 21a is moved and balanced and stopped, and when a predetermined load is applied to the rake 24, the rake arm 22 is turned up in the manner of the lifting operation. The tilt angle of the rake arm 22 changes by swinging around the stop position of the connecting shaft 23 in the opposite direction, and the tilt angle sensor 26 detects the tilt angle of the rake arm 22 and its change, and the predetermined tilt angle is detected. When the change occurs, the rake overload detection mechanism determines that the rake is in an overload state and stops the rake scraping operation.

  As shown in FIG. 2, the rake unit 20 is mounted on the rake arm rotary dust remover 10. The rake arm rotary dust remover 10 is mainly provided in the rake unit 20 and a screen 11 having flat plates arranged in a water channel at predetermined intervals, a roller guide 12 that guides the rake unit 20 by a roller 12 a provided in the rake unit 20, and the rake unit 20. A rack mechanism 13 for moving the rake unit 20 along the screen 11 by the rack wheel 13a, and a chute 14 for discharging the deposit A scooped up by the rake 24 and the dust sandwiched between the screens 11 at the upper part of the rack mechanism 13. And an upper casing 15 and a lower casing 16 for covering the rake unit 20 and the like, and an operating table 17 for operating the rake arm rotary dust remover 10.

The drive unit frame 21 of the rake unit 20 has a rotation drive unit 25 and a shaft hole 21 a for connecting the connection shaft 23 of the rake arm 22 to the other end. The drive unit frame 21 is provided with a rack wheel 13a, and the rack wheel 13a is connected to the rack mechanism 13 of the rake arm rotary dust remover 10 so that the rake unit 20 can move along the screen 11. It has become.
The hole diameter of the shaft hole 21a is larger than the diameter of the connecting shaft 23 of the rake arm 22, and the hole diameter is such that the connecting shaft 23, that is, the rake arm 22 is allowed to move freely.
The rotation drive unit 25 of the drive unit frame 21 is provided with a reduction gear 25a with an electric motor for rotating the rotation drive unit 25 about the axis.

  In this embodiment, the rake arm 22 is shaped like a side view, and a rake 24 is attached to one end, and a connecting shaft 23 is provided to the other end. An inclination angle sensor 26 is provided at a predetermined position of the rake arm 22. The connecting shaft 23 is movably connected to the shaft hole 21 a of the drive unit frame 21.

  The tilt angle sensor 26 may be a waterproof type that can be used in water. In the present embodiment, the rake arm 22 is provided immediately above the portion bent in a dogleg shape, but is not limited to this and may be provided in a place where it is easy to detect a change in the inclination angle during overload. In consideration of improvement in sensor durability and maintainability, it is better to install the sensor at a position where it will not be exposed to water at all times.

  The rake 24 has a shovel shape for scooping up the deposit A at the bottom of the water channel, and has a comb-tooth shape whose tip can be inserted into a gap between the screens 11 disposed. When the rake unit 20 rotates, the deposit A is scraped up and inserted into the gap of the screen 11, and the rake unit 20 is raised by the rack mechanism 13 while maintaining the state, and is placed on the rack mechanism 13. The deposit A scooped up to the provided chute 14 and the dust caught in the gap between the screen 11 are discharged.

  The rake unit 20 is provided with an overload setting machine 27 configured to connect the drive unit frame 21 and the rake arm 22. With this overload setting machine 27, it is set how much load is applied when the rake 24 collides with the deposit A as an overload state in which the rake 24 and the rake arm 22 swing in the direction opposite to the scraping direction. can do. The overload setting machine 27 normally uses a spring, but is not limited to this, and any mechanism that swings in a direction opposite to the scraping direction when a predetermined load is applied may be used.

  Next, the scraping operation of the rake unit 20 will be described. As an operation of scooping up the dust collected at the bottom of the water channel and discharging it to the chute 14 at the normal time, first, the rake unit 20 is moved to the bottom of the water channel by the rack 13, and then the rotary drive unit 25 provided in the drive unit frame 21. 2 (b), the rake arm 22 and the rake 21 connected to the shaft hole 21a of the drive unit frame 21 cooperate to rotate counterclockwise and scrape up. In operation, the deposit A collected at the bottom of the flow path and the dust sandwiched between the screens 11 are scooped up, and then the rake unit 20 is lifted by the rack mechanism 13 to the chute 14 provided at the upper part of the rake arm rotary dust remover 10. Scattered sediment A and waste are to be discharged. If the overload state does not occur, the connecting shaft 23 of the rake arm 22 is positioned substantially vertically below the shaft hole 21a of the drive unit frame 21, and the rake arm 22 rotates around this position.

Next, the operation during overload will be described with reference to FIG.
Until the collision with the deposit A, the connecting shaft 23 of the rake arm 22 is located substantially vertically below the shaft hole 21a of the drive unit frame 21 as shown in FIG. The rake arm 22 rotates around this position.

If the deposit A contains rocks, branches, etc. that are too large to be lifted up by the rake 24, the rake 24 collides with the deposit A, and the rake 24 exceeds the set load of the overload setting machine 27. When a load, that is, an overload state is reached, the connecting shaft 23 moves through the shaft hole 21a of the drive unit frame 21 in the vector direction of the load received by the rake arm 22 as shown in FIG. At the same time, the tilt angle of the rake arm 22 changes when the rake arm 22 swings about the stop position of the connecting shaft 23 in the direction opposite to the rotation direction of the scraping operation, and the tilt angle sensor 26 detects the tilt angle of the rake arm 22 and The change is detected, and when the predetermined inclination angle changes, the rake is determined to be in an overload state, and the rake scraping operation is stopped.
Since the connecting shaft 23 and the shaft hole 21a are movably connected to each other, the rake arm 22 moves in an overloaded state, so that the change in the inclination angle of the rake arm 22 changes more significantly than the case where the rake arm 22 does not move. There is an advantage that detection of 26 can be performed with higher accuracy.

  The rake overload detection mechanism of the rake arm rotary dust remover of the present invention is widely used not only for dust removal of screens installed in water channels, but also for overload detection of mechanisms that use a scraping operation with a rotation operation. Can be applied.

A Deposit 10 Rake arm rotary dust remover 11 Screen 12 Roller guide 12a Roller 13 Rack mechanism 13a Rack wheel 14 Chute 15 Upper cover 16 Lower cover 17 Operation table 20 Rake unit 21 Drive unit frame 21a Shaft hole 22 Rake arm 23 Connecting shaft 24 Rake 25 Rotation Drive Unit 25a Reducer 26 with Electric Motor 26 Inclination Angle Sensor 27 Overload Setting Machine

Claims (2)

In the rake arm rotary dust remover, where the rake scoops up the dust in the water along with the screen installed so as to block the water channel, along with the lifting and rotating operation,
The rake, a rake arm having one end attached to the rake and having a connecting shaft at the other end, and a driving unit frame having a rotation driving portion at one end and a shaft hole for connecting the connecting shaft of the rake arm at the other end. And a rake unit having an inclination angle sensor,
The diameter of the shaft hole of the drive unit frame is set larger than the diameter of the connecting shaft, and the connecting shaft is movably connected to the shaft hole;
When the rake collides with the sediment at the bottom of the water channel by the scraping operation of the rake and a predetermined load is applied to the rake,
The connecting shaft moves within the shaft hole of the drive unit frame to be balanced and stopped, and the rake arm swings around the stop position of the connecting shaft in a direction opposite to the rotation direction of the scraping operation. The tilt angle of the rake arm changes by moving,
The rake arm is characterized in that the tilt angle sensor detects the tilt angle of the rake arm and its change, and when the predetermined tilt angle changes, the rake is determined to be in an overload state and the rake scooping operation is stopped. Rake overload detection mechanism of rotary dust remover.   The rake overload detection mechanism of a rake arm rotary dust remover according to claim 1, wherein the inclination angle sensor is provided at a predetermined position of the rake arm.

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