JPH0498Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention scrapes up and removes debris hanging on bar screens installed in dams, river intakes, pumping stations, water treatment plants, etc. This invention relates to a rake lifting safety device for a rake-type dust remover.

(Prior technology) Conventionally, a rake was equipped to scrape up the garbage hanging in front of a bar screen such as a waterway, and the rake arm was made to be extendable and retractable in multiple stages. A dust remover is known in which a pinion, which is mounted and rotated by a drive device mounted on an arm truck, is engaged with a rack chain disposed in the longitudinal direction of the rake elevating guide frame. .

(Problems to be Solved by the Invention) In the above prior art, the rake arm is forcibly lowered, so if there is an obstacle on the way down, a buckling force acts on the rake arm. By the way, the drive device, especially the motor output, is set depending on the hoisting load, so the motor torque differs greatly between hoisting and lowering, and the torque limiter installed in a normal speed reducer cannot An overload can be detected on the upper side, that is, when the rake is rising, but if a load of 100% of the motor torque is applied on the lower side, that is, when the rake is lowered, the rake arm and other supporting parts will
There is a problem of severe damage caused by buckling forces.

The present invention was developed by focusing on the above-mentioned circumstances, and provides a safety device that detects when a load exceeding a predetermined value is applied due to an obstacle or the like when lowering the rake and stops the motor. The purpose is to

(Means for solving the problems) In order to solve the above problems, the present invention takes the following specific technical means.

That is, in the present invention, a pair of left and right rake elevating guide frames are pivotally mounted on the dust removal mechanism frame via a horizontal axis so as to be able to swing back and forth, and an arm truck with the upper end of the rake arm attached between the rake elevating guide frames is arranged. A drive shaft parallel to the horizontal shaft is pivotally attached to this arm truck, and a drive device for rotating this drive shaft is mounted. A rack chain is provided within the rake elevating guide frame over almost its entire length, and pinions wedged on both ends of the drive shaft are meshed with this chain. Further, the upper end of the chain is fixed to the upper end of the frame, and the lower end is attached to the lower end of the frame so as to be movable up and down via a rod and a spring,
Overload detection means is provided which is activated when the lower part of the chain moves by a predetermined amount.

Further, an upper chain wheel of an endless chain wound vertically inside the rake arm is rotated directly or indirectly by the drive shaft, and a rake truck is provided on the rake arm to move up and down using the endless chain as a guide. It is locked to an endless chain, and a rake is attached to this rake cart.

The rake elevating guide frame is configured to be able to swing back and forth using a cylinder device or the like.

(Function) According to the present invention, after the cylinder device pulls the upper end of the rake lifting guide frame backward and pushes the rake forward, the drive device is operated to rotate the pinion and roll it on the rack chain. When the arm truck is lowered, the endless chain also rotates, and the rake descends along the rake arm at about twice the speed of the arm truck, submerging into the water. Then, when the rake reaches its lowering limit, the drive device is stopped, and at this time, the rake is positioned near the bottom of the waterway on the upstream side of the garbage, a predetermined distance ahead of the bar screen. Therefore, when the cylinder device is operated to push the upper end of the rake elevating guide frame forward, the rake moves while scraping up the debris in the water toward the bar screen, and stops when it comes into contact with the bar screen. At this time, the rake is located at the lower end of the lower end bar screen and is pressed against the bar screen. When the drive device is operated again in this state to rotate the pinion, the pinion moves onto the rack chain in the rake guide frame. As the arm carriage rolls, the rake carriage rises as well, and the rake rises while scraping up the dust hanging on the front surface of the screen. When the rake passes the upper end of the front apron above the bar screen, the debris on the rake falls onto a chute provided at the rear of the apron, and the drive device is stopped at the upper limit. Therefore, even if the rake gets caught on an obstacle while descending, the pinion driven by the drive device continues to rotate, so the rack chain is raised against the elastic force of the spring, and the overload detection means is activated. The drive is stopped. Therefore, the rake arm and other supporting parts will not be damaged by buckling.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In this embodiment, the dust removal mechanism is of a traveling type, but the same configuration can be applied to a stationary type.

In the drawing, 1 is a waterway, 2 is a waterway side wall, 3 is a slab, 4 is a bar screen, and the waterway side wall 2
The slab 3 is installed in the vicinity of the upper downstream side of the screen 4 so as to straddle the waterway 1. On the top of the waterway side wall 2, a gate-shaped dust removal mechanism frame 5 is provided which straddles the top of the bar screen 4 and is movable via wheels 7 on a rail 6 provided parallel to the bar screen 4.
Directly above the slab 3 of this frame 5, a garbage receiving and carrying out conveyor 8 is provided. Reference numeral 9 denotes a front apron, which is provided very close to the top of the bar screen 4 and at the same slope as the bar screen 4, and the conveyor 8 located behind this front apron 9.
A garbage chute 11 is provided between the upper end of the side plate 10 and the upper end of the front apron 9.

12 is a rake, 13 is a pair of left and right rake rods, 1
4 is a rake truck connected to the upper end of the rake rod 13, 15 is a rake arm, and this rake arm 1
5 is connected to an arm truck 16 at its upper end.

The rake arm 15 is formed by connecting grooves of groove-shaped members facing each other at a constant interval, and the plate-shaped base 17 of the rake truck 14 is disposed outside each groove-shaped member of the rake arm 15. This plate-like base 17
, a support shaft 19 on which wheels 18 are pivotally connected at both ends,
They are connected by 20.

21 is a pair of left and right rake lifting guide frames,
They are connected by upper and lower connecting members 22 so that the grooves of the channel members face each other, forming a rectangular framework. This rake elevating guide frame 21 includes
A mounting bracket 23 is protruded from the rear side of the approximately central portion thereof, and horizontal shafts 24 are fixed to both the left and right brackets 23, and the outer ends of both horizontal shafts 24 are rotatable by bearings 25 mounted on the frame 5. It is pivoted.

And between the rake lifting guide frame 21,
An arm truck 16 is provided so as to be movable up and down via wheels 26 and 27. Furthermore, a rack chain 28 (roller chain) is provided on one of the inner surfaces of each channel member of the rake elevating guide frame 21 facing the flange, as shown in FIGS. 3 to 6.
It is stretched over almost the entire length of the That is,
This chain 28 has its upper end connected to the chain end fitting 2.
9 is fixed to the upper end of the frame 21, and the lower end is connected to the upper end of an adjustment rod 31 via a take-up metal fitting 30. This adjustment rod 31 passes through a mounting bracket 32 made of an L-shaped member attached to the lower end of the frame 21, and a spring 33 for torque setting and a micro-switch operating hardware 34 (to be described later) are fitted onto the outside, and a nut 35 is screwed. A micro switch 36 for overload detection is attached to the lower end of the frame 21 in correspondence with the micro switch actuating hardware 34.

And, on the lower side of the rack chain 28,
A chain support rail 37 is provided over almost the entire length, and on the upper side, chain holding metal fittings 38 are provided at predetermined intervals, and furthermore, chain resting members 39 are provided at appropriate locations.

Further, a pinion 41 wedged onto both ends of a drive shaft 40 is meshed with the chain 28 .

The drive shaft 40 passes through the arm truck 16 in the left-right direction and is horizontally rotatably supported.
A chain wheel 45 driven by a transmission chain 44 wound around a chain wheel 43 wedged around the output shaft of a drive device (such as a motor) 42 mounted on the arm truck 16 is wedged. Further, a chain wheel 46 is wedged around the drive shaft 40 so as to be located on the center line of the rake arm 15, and a chain 48 is wound around the chain wheel 47 which is pivotally connected inside the lower end of the rake arm 15. A rake trolley 14 is locked to.

Reference numeral 49 denotes a cylinder device (such as an electric power cylinder) that swings the rake elevating guide frame 21 in the front-rear direction. The rod 53 is pivotally supported by a support shaft 52 so as to be swingable in the vertical direction, and the tip of the rod 53 that extends forward connects to the connecting member 2 at the upper end of the rake elevating guide frame 21.
It is pivoted to 2.

54 is a wiper for scraping dust off the rake 12, 55 is a travel drive device for the frame 5, 56 is a transmission mechanism, and 57 is a driver's cab.

Note that stoppers (not shown) are provided at the upper and lower ends of the rake elevating guide frame 21, and the arm cart 16 comes into contact with these stoppers to start and stop the arm cart 16, that is, to start and stop the drive device 42. I am told to do it by myself. Also,
The tension of the rack chain 28 can be adjusted by a take-up fitting 30.

Next, the dust removal work in this embodiment will be described.

The rake 12 shown in solid line in FIG.
It is located at the lower front end of the bar screen 4. When the drive device 42 starts operating in this state, the drive shaft 40 of the arm truck 16 rotates, and the pinion 41 and chain wheel 46 rotate. At the same time, the chain 48 moves due to the rotation of the chain wheel 46, and the rake truck 14 moves onto the rake arm 1.
5 as a guide. In this way, the rake 12 rises, scoops up the dust hanging on the bar screen 4, and the rake 12 rises to the upper end of the front apron 9.
When it reaches the position indicated by the reference numeral 112, garbage begins to fall onto the input chute 11, and as the rake 12 further rises, the wiper 54 comes into contact with the rake 12, and as the rake 12 rises, the wiper 54 also rotates backward. The garbage is moved to the tip of the rake 12 and forced to fall. Then, at the position where the rake 12 is indicated by reference numeral 212, the arm truck 16
When the rake truck 14 reaches its upper limit, the drive device 4
2 automatically stops, the tip of the wiper 54 moves to the tip of the rake 12, and the forcible scraping of the garbage is completed. Now, when the cylinder device 49 is operated to pull the upper end of the rake elevating guide frame 21 backward, the rake 12 moves forward.
In this state, the operation can be stopped and the rake can be put into a rest state.

Furthermore, when continuing the dust removal work, by operating the drive device 42 and rotating the drive shaft 40 in the opposite direction,
The arm truck 16 and the rake truck 14 descend, the rake 12 reaches its lowering limit at about twice the speed of the arm truck 16, the drive device 42 automatically stops, and then the cylinder device 49 operates to raise and lower the rake. The upper end of the guide frame 21 is pushed forward, and on the other hand, the rake 12 moves toward the bar screen 4 while raking up trash, and when it comes into contact with the bar screen 4, the cylinder device 49 stops. When scraping up garbage again, the rake 12 is raised approximately 2 times above the arm truck 16 by driving the drive device 42 to raise the arm truck 16 in the same manner as described above.
It rises twice as fast and performs dust removal work smoothly and reliably.

Therefore, when the rake 12 hits an obstacle while descending, the pinion 41 continues to rotate but the rake arm 15 does not descend, so the rack chain 2
8 is pulled upward (indicated by arrow A in Figure 3),
The adjustment rod 31 resists the elastic force of the spring 33.
moves upward, and when a load of more than a certain value is applied, the micro switch actuating hardware 34 activates the micro switch 3.
6 is activated, the motor power of the drive device 42 is cut off, and the drive device 42 is stopped. In this way, when the rake is lowered, the rake arm 15,
If an overload is applied to the rack chain 28 or the like, the overload is automatically detected and serious damage is avoided.

This overload detection means is a micro switch 36.
The method is not limited to this, and other conventionally known means can be adopted.

(Effect of the invention) Since the rake lifting safety device of the dust remover according to the invention has the above-mentioned configuration, the rake arm, rack chain, pinion, etc. are prevented from being subjected to loads exceeding a predetermined value due to obstacles when the rake is lowered. When this occurs, the overload detection means detects this and stops the drive device such as the motor, preventing the rake arm and other supporting parts from being seriously damaged by the buckling force, thereby increasing the safety of the entire device. It is highly reliable, simple in construction, reliable in operation, and economical.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a front view, Fig. 2 is a partially cutaway side view, Fig. 3 is a side view of the rake lifting guide frame, and Fig. 4 is A of Fig. 3. - An enlarged cross-sectional view along line A, Figure 5 is B of Figure 3.
- An enlarged cross-sectional view along line B, Figure 6 is C- of Figure 5.
An enlarged cross-sectional view along line C, Figure 7 is D-D in Figure 5.
It is an enlarged cross-sectional view along the line. 1... Channel, 2... Channel side wall, 4... Bar screen, 5... Dust removal mechanism frame, 12... Rake, 1
4...Rake trolley, 15...Rake arm, 16
...Arm trolley, 21...Rake lifting guide frame, 24...Horizontal shaft, 28...Rack chain,
29... Chain end fitting, 30... Take-up fitting, 31... Adjustment rod, 33... Spring, 34... Micro switch operating hardware, 35...
...Natsuto, 36...Micro switch, 40...
Drive shaft, 41... pinion, 42... drive device,
43, 45, 46, 47... Chain foil, 4
4,48...Chien.

Claims (1)

[Scope of utility model registration request] It is equipped with a rake that scrapes up the dust hanging on the front of the screen such as a waterway, the rake is attached to a rake arm, and the upper end of this rake arm is attached to the rake lifting guide frame via an arm cart.
A dust remover in which a pinion rotated by a drive device mounted on an arm truck is meshed with a rack chain disposed in the longitudinal direction of the rake elevating guide frame, the chain having an upper end thereof Overload detection means is provided which is fixed to the upper end of the frame and whose lower end is movable up and down via an adjustment rod and a spring, and which is activated when the lower part of the chain moves by a predetermined amount. A rake lifting safety device for a dust remover.