JPS5921642B2 - Traveling type sediment scraping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sediment scraping device that continuously scrapes sediment such as sand, mud, and dust settled in a sedimentation pond attached to a sewage treatment plant or a drainage pump station, and particularly relates to This relates to a traveling type sediment scraping device that can travel on ponds.

Urban sewage or industrial wastewater contains foreign substances such as sand, mud, and dust, and it is common practice to separate these foreign substances by sedimentation in a settling tank.

The sediment deposited in the sedimentation basin is extracted by scraping. In recent years, moving type scraping equipment that runs above the sedimentation basin has been widely used instead of a stationary type.

This is because the number of sedimentation basins becomes large, and the operation efficiency of the raking apparatus is higher if a large number of sedimentation basins are treated with a small number of raking apparatuses.

An example of such a traveling type sediment scraping device is shown in Figures 1 to 3.
As shown in the figure.

In FIGS. 1 and 2, first, a longitudinal frame 2 is provided between both banks of the sedimentation basins so as to straddle a plurality of sedimentation basins 1 so as to be freely movable via a running means.

A transverse frame 3 is similarly mounted on the longitudinal frame 2 so as to be movable over its entire length via a traveling means.

Next, a packet elevator is installed in the traversing frame 3.

As means for conveying sediment, an on-board conveyor 5 over the entire length of the longitudinal frame 2 and a ground conveyor 6 are provided along either shore of the sedimentation basin 1.

The discharge end of the onboard conveyor 5 faces above the ground conveyor 6, and a chute 7 provided in the packet elevator 4 communicates with the onboard conveyor 5.

In order to scrape up the sediment accumulated in the sedimentation basin 1 using the above-mentioned traveling type sediment scraping device, first raise and lower the elevator frame 9 of the packet elevator to the uppermost end (as shown in Fig. 3). The transverse frame 3 is moved to a position above the desired sedimentation tank 1, and the packet elevator is placed directly above the sedimentation tank 1.

Next, the lifting frame 9 of the packet elevator is lowered into the sedimentation basin 1 to scrape up the sediment, and the chute 7 and on-board conveyor 5
and transported via a ground conveyor 6.

The sediment in the entire sedimentation tank 1 is scraped up while moving the vertical frame 2 and the horizontal frame 3 appropriately.

When the raking of the sedimentation basin 1 is completed, the elevating frame 9 of the packet elevator is raised to the uppermost end and moved to the other sedimentation basin to carry out the same raking.

An elevating frame 9 is provided within the frame 8 of the packet elevator so as to be able to rise and fall freely, and an elevating drive device 10 is further provided, and a pair of Cheno wheels 14 are provided at the lowest end of the elevating frame 9 on the same rotating shaft.

Next, a chain tensioning wheel 11 is provided on the machine frame 8 so as to be horizontally movable, and a horizontal moving device 12 for the wheel 11 is interposed to engage the two to form a chain tensioning device.

Reference numeral 13 denotes a cheno guide wheel provided on the machine frame 8.

The tension wheel 11, the guide wheel 13, and the cheno wheel 14 are wound with chenos 16 having packets 15 fixed at regular intervals.

When the above-mentioned raking device rakes up the sediment in the sedimentation basin 1, the longitudinal frame 2 is caused to travel at the same time as the chen 16 to which the packet 15 is fixed is driven.

Conventionally, when the raking capacity decreases while the longitudinal frame 2 is running,
As a result of the lower end of the lifting frame 9 being restrained by deposits, a bending moment acts on the lifting frame 9.

This caused the deformation of the lifting frame 9 and the slippage of one side of the longitudinal frame 2 during running due to the resistance of the sedimentation tank, causing skewing.

An object of the present invention is to prevent excessive bending moments from being applied to the lift frame, protect the structural members, and prevent the longitudinal frame from slipping during running.

The feature of the present invention is that, in a traveling type sediment scraping device, a pressure detector 30 in contact with the lifting frame 9 is connected to a control unit, and this control unit is connected in parallel to a PI regulator and a meter relay to set a reaction force. the PI regulator is connected in parallel with a control unit, the PI regulator is connected to a motor controller via a travel speed setting device, the motor controller is connected to a travel drive device, and the meter relay and travel drive are connected in parallel. It is connected to the device.

Next, FIGS. 4 to 8 are diagrams showing embodiments of the present invention,
Fig. 4 is an overall side view, Figs. 5 and 6 are an enlarged side view and a sectional plan view of section A in Fig. 4, respectively, and Fig. 7
The figure is an enlarged sectional view of section B in FIG. 5, and FIG. 8 is a block diagram showing the control device.

First, in FIG. 4, the machine frame 28 is fixed to the transverse frame body 3,
An elevating frame 9 is disposed within the machine frame 28 via guide rollers 29 so as to be movable up and down.

A pressure detector 30 is fixed to the machine frame 28.

The elevating drive device 10 provided on the machine frame 28 is constructed by meshing engagement between a rack 19 provided on the elevating frame 9 and a pinion 20.

A guide wheel 13 provided on the machine frame 28, a tension wheel 11 provided horizontally movably, and a fixed drive wheel 2
A chain 16 having a plurality of packets 15 mounted at equal intervals is wound around the chain 1 and connected to a rotating device 22.

□Next, the configuration around the pressure detector 30 will be explained with reference to FIGS. 5 to 7.

As mentioned above, the elevating frame 9 is provided within the machine frame 28 so as to be able to rise and fall freely,
A guide roller 29 is interposed between the two.

On the other hand, the pressure detector 30 is fixed to the machine frame 28, and the guide roller 29 portion of the pressure detector 30 is in contact with the lifting frame 9 by pressing.

The pressure detector 30 has a cylindrical case 43 and a spring 4 inside this case.
7. The pressure detecting element 44 and the guide roller 29 are fitted in this order.

One side of the case 430 has a lid attached with bolts, and the other side is fixed to the machine frame 28.

The guide roller 29 consists of a guide roller main body 46 and its supporter 45.

Next, in FIG. 8, the pressure detector 30 is connected to an amplifier via a control unit, and the amplifier and reaction force setting device are connected to a PI regulator.

A PI regulator is an electric regulator that uses both proportional action and integral action.When an external factor is added to the proportional action and an offset occurs, the integral action eliminates the offset. This is an adjustment circuit that solves the problem.

The PI regulator is connected to the travel drive device and the speed detector via the travel speed setter and the motor controller.

The speed detector connects a feedback circuit upstream of the motor controller.

A meter relay circuit is connected between the control unit and the travel drive device.

When scraping in only one direction, only one pressure detector is required.

Next, in FIG. 4, if there is a certain amount of sediment 4 deposited on the bottom of the settling tank 1, the bending moment applied to the lifting frame 9 will also change.

In FIGS. 5 to 7, the load applied to the pressure detection element 44 via the guide roller body 46 and the roller support 45 interposed between the lifting frame 9 and the machine frame 28 also changes.

Since the pressure detection element 44 is always pressed against the lifting frame 9 by the spring 47 as shown in FIG. 7, load transmission is ensured no matter where the lifting frame 9 is located.

In this way, the pressure detector 30 detects the load applied to the pressure detector 30, and inputs the signal to the amplifier.

When inputting the signal detected by the detector 30 to the amplifier, the control unit controls whether the signal from the pressure detector is inputted to the amplifier depending on whether the vertical frame 20 is traveling forward or backward.

The signal passed through the amplifier and the signal from the reaction force setting device, which receives the reaction force setting signal corresponding to the no-load steady running rake speed of the device of the present invention, are input to the PI adjuster.

The PI regulator inputs the difference signal between the reaction force setting signal and the pressure detector signal to the travel speed setting device.

Depending on the magnitude of the difference signal, the travel speed setter issues a speed command according to the load via the motor controller, and this speed command is input to the travel drive device to operate the vehicle.

The speed detector detects the travel speed of the travel drive and feeds this back to the motor controller to modify the motor control.

In addition, a signal corresponding to the maximum reaction force is input into the meter relay in advance, and when the reaction force signal detected by the pressure detector 30 exceeds the maximum reaction force signal, the traveling drive device 48 A stop command is issued and the entire device stops running.

As explained above, the traveling type sediment scraping device according to the present invention detects the load applied to the lifting frame by the pressure detector installed in the lifting frame even if the amount of accumulated sediment changes, and adjusts this signal. By automatically controlling the traveling speed through the device, it is possible to eliminate abnormal bending moment of the elevator frame and prevent meandering caused by the unbalanced load of the vertical frame.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are a front view and a side view, respectively, showing a conventional traveling type sediment scraping device. FIG. 3 is a side view showing the traveling type sediment scraping device when the elevator frame is raised to the uppermost end. FIG. 4 is a side view showing the same device of the present invention, FIG. 5 is an enlarged view of section A in FIG. 4, FIG. 6 is a sectional view of the detector section in FIG. 5, and FIG. It is an enlarged cross-sectional view of part B. FIG. 8 is a block diagram showing the control device.

Claims (1)

[Claims] 1. A longitudinal frame is provided so as to be freely movable across a plurality of sedimentation basins, a transverse frame is provided on the longitudinal frame so as to be movable, and the transverse frame is movable up and down within a machine frame fixed to the transverse frame. A lifting frame is installed,
In the traveling type sediment scraping device configured by rotatably attaching a cheno to which a plurality of packets are fixed and which circulates throughout the machine frame and the lift frame, a pressure detector that comes into contact with the lift frame is provided. 30 is connected to a control unit, this control unit is connected in parallel to a PI regulator and a meter relay, a reaction force setter is connected to a PI regulator in parallel with the control unit, and this PI regulator is connected to a traveling speed setter in parallel. A traveling type sediment scraping device, characterized in that the meter relay is connected to a motor controller via a motor controller, the motor controller is connected to a travel drive device, and the meter relay is connected to the travel drive device.