JPH0542537B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a device used for dredging sludge, earth and sand accumulated at the bottom of a manhole in a sewer system, and more specifically, This invention relates to a raking device for raking up sludge, earth and sand, etc.

[Prior Art] The manholes of the sewer system, especially the manholes in the overhanging part, are deep and have a constant flow of sewerage flow, and a layer of solidified earth and sand is deposited at the bottom of the manholes. Furthermore,
The opening is closed with a small-diameter manhole cover (opened and closed by hand, so it is as compact as possible).
The lower part is expanded in diameter and forms the bottom of a large cross section.

For this reason, with the dredging method using grab buckets operated by ordinary wire ropes, it is difficult to insert and remove the grab buckets through narrow openings, and even if it is possible to insert the grab buckets into narrow openings. ) It is difficult to reach the deep bottom with a grab bucket and dredge the earth and sand to every corner of the expanded manhole bottom, and furthermore, it is difficult to excavate and dredge the solidified earth and sand layer. There are technical issues such as:

For this purpose, there is a method of dredging by attaching a grab bucket to the tip of a relatively rigid elevating post, lowering the elevating post into the hole, and scooping up the earth and sand at the bottom of the hole with the grab bucket (hereinafter, this method is referred to as " However, even with this elevating post method, only the earth and sand immediately below the elevating post can be dredged, and the earth and sand in other areas cannot be removed.

[Object of the present invention] Therefore, the object of the present invention is to supplement the above-mentioned elevating post method, and to attach the elevating post to the elongated elevating post, and to scrape up the earth and sand in areas that cannot be removed with a grab bucket. The purpose of the present invention is to provide a so-called raking device, which is used to scoop up and discharge soil and sand to the outside using a grab bucket.

[Configuration of the present invention] For this reason, the raking device of the present invention adopts the following configuration (technical means). That is, a four-section link mechanism consisting of an arm, an arm with a scraping plate, and a boom is arranged at the bottom of the main body frame, and the arm or boom and the main body frame are connected to each other with a pin by a single hydraulic cylinder. Further, a scraping plate is fixed to the tip of the arm with the scraping plate, and the main body frame is swingably fixed to the mounting bracket via a rotating shaft mechanism.

[Function] The raking device of the present invention is used and functions as follows.

It is removably attached to the lower end of the lifting post using a mounting bracket, and the link mechanism is passed through the manhole opening in the contracted state. When the bottom of the manhole is reached, the link mechanism is expanded to extend the scraping board, and the hydraulic cylinder repeatedly contracts and extends to scrape up the scraping board, and the earth and sand at the bottom of the manhole is scraped up to just below the lifting post. . Rotate the main body frame horizontally by the required angle with respect to the mounting bracket, and perform the above operation. Once the required amount of earth and sand at the bottom of the manhole has been gathered directly under the lifting post, the link mechanism is contracted and the device is lifted up.

Thereafter, the device is removed from the lifting post, a convenient dredging device such as a grab bucket is attached in its place, and the grab bucket is lowered to the bottom of the manhole to scoop up the soil and discharge it to the outside of the manhole.

[Example] Hereinafter, an example of the raking device of the present invention will be described based on the drawings.

1 to 3 show one embodiment thereof.

Here, K is a raking device, which is made up of main members: a main body frame 1, an arm 2, an arm 3 with a raking plate, a boom 4, a hydraulic cylinder 5, and a raking plate 6.

The main body frame 1 supports a link mechanism L consisting of arms 2 and 3 and a boom 4, as well as a hydraulic cylinder 5. The main body frame 1 is made of a thick steel plate, and includes left and right frame plates 1a, 1b, a back plate 1c, and a top plate 1d. A recess 1A is formed by these plate members 1a to 1d, and a hydraulic cylinder 5 is accommodated in the recess 1A. 1f is a reinforcing rib.

A pair of arms 2 and 3 and a boom 4 constituting the link mechanism L are arranged on both sides of the main body frame 1.

7 is a pin for pivotally connecting arm 2 to main frame 1; 8 is a pin for pivotally connecting arm 2 and arm 3;
9 is a pin for pivotally connecting the boom 4 to the main body frame 1;
and 10 are pins for pivotally connecting the boom 4 and the arm 3. The quadrilateral formed by the pins 7-8-9-10 is a trapezoid.

This link mechanism L constitutes a so-called approximate linear motion mechanism, and the ratio of each link (length between each pin) is specially determined (7-8≒9-10, 7-9:8-10≒
2:1), the lower surface 6a of the scraping board is moved horizontally (or almost horizontally) in a straight line.

One side (that is, the cylinder side) of the hydraulic cylinder 5 is pivotally connected to the main body frame 1 by a pin 11, and the other side (that is, the plunger 5a side)
is pivotally attached to the boom 4 at an intermediate position by a pin 12.

Therefore, the plunger 5 of the hydraulic cylinder 5
When a is extended, the link mechanism L extends forward and moves the scraping plate 6 attached to the tip of the arm 3 to the farthest position from the frame body 1 (see FIG. 1). Also, the plunger 5 of the hydraulic cylinder 5
When b is contracted, the link mechanism L is contracted and draws the scraping plate 6 to a position in front of the frame body 1 (see FIG. 2).

The movement locus of the scraping plate 6 (particularly its lower surface 6a) moves horizontally (in the direction A in FIG. 1) and does not float upward.

13 is a mounting bracket. The mounting bracket 13 is intended to be mounted to a mounting portion 21 at the lower end of the lifting post 2, which will be described later. A lower plate 13a is integrally fixed to the mounting bracket 13, and a pin insertion hole (screw hole) is provided at the front end of the lower plate 13a.
A retainer 13c having 3b is attached. 13d is a hanging pin insertion hole, and 13e is an insertion/extraction pin insertion hole.

The main body frame 1 and the mounting bracket 13 are capable of horizontal rotation (so-called oscillating movement) via a rotating shaft mechanism 14.

The rotating shaft mechanism 14 has a rotating shaft 1 fixed to the lower surface of the lower plate 13 of the mounting bracket 13 in a protruding manner.
4a, a bearing body 14b fixed to the main body frame 1 and holding the rotating shaft 14a, and a bush 14c interposed between the rotating shaft 14a and the bearing body 14b. In order to prevent the rotary shaft 14a from being pulled out from the bearing body 14b, an appropriate retainer 14d (in this embodiment, a plate and a nut) is provided.

15 is the main body frame 1 and the mounting bracket 13
It is a fixed pin that restricts rotation with the pin shaft 15.
a and a handle 15b. The pin shaft 15a is connected to the pin insertion hole 13b of the retainer 13c and the frame body 1.
It is inserted through engagement holes 1e that are concentrically drilled at a required pitch in the upper plate 1d.

FIG. 4 shows the mounting part 21 at the lower end of the lifting post 20.
shows the structure of Here, 21a is a pair of brackets placed apart from a space 21A in which the mounting bracket 13 of the raking device K is fitted, and 21b
21c is a hanging pin insertion hole drilled at an upper position of the bracket 21a, and an insertion pin insertion hole 21c is bored at a lower position of the bracket 21a. 2
1d is a reinforcing rib. Furthermore, 22 is a hanging pin, and 23 is an insertion/extraction pin. pins 22, 23
Appropriate retainers (plates, nuts) are applied to the

The manner in which the present raking device K is attached to the elevating post 20 is as follows. In other words, lifting post 2
Space 2 between the brackets 21a of the mounting portion 21 of 0
1A, fit the mounting bracket 13 of the raking device K, align the phases of the hanging pin insertion holes 13d, 21b and/or the insertion/removal pin insertion holes 13e, 21c, and then insert the hanging pin 22 and/or the insertion/removal pin 23. The elevating post 20 and the main raking device K are attached by inserting the elevating post 20 into these insertion holes. Note that when only the hanging pin 22 is attached, the scraping device K is attached to the lifting post 20. When both the hanging pin 22 and the insertion/extraction pin 23 are attached, the scraping device K is attached to the lifting post 20. It can swing freely around the center, and is fixed integrally (not swingable) with a hanging pin 22.

This raking device K is used in the following manner.

The steps will be explained below in order.

(1) A so-called telescopic lifting post 20 extending in multiple stages (first stage 20a, second stage 20b, third stage 20c) directly above the opening I of the manhole H is installed using the guide member 30. To support. The guide member 30 is mounted on a vehicle (not shown) or the like, and has the function of accurately supporting the lifting post 20 in the vertical direction and guiding its vertical movement.

(2) The present raking device K is attached to the mounting portion 21 at the lower end of the lifting post 20, and the hydraulic cylinder 5 is contracted to bring the raking plate 6 into a contracted state.

(3) Extend the lifting post 20 and lower the raking device K into the manhole H. At this time, since the scraping plate 6 is in a contracted state, it can easily pass through the opening I of the manhole H with the manhole cover open.

(4) When the raking device K reaches the bottom of the manhole, the hydraulic cylinder 5 is extended to move the raking plate 6 to the back of the manhole bottom, and then the hydraulic cylinder 5 is contracted to move the raking plate 6 to the back of the manhole bottom. is moved to the main frame 1 while raking up sludge and earth and sand.
This operation is repeated as many times as necessary (sometimes once) (see Figure 5).

(5) Raise and lower the lifting post 2 with the raking device K in the contracted state.
Shrink 0 and raise it to the ground.

(6) Release the fixed pin 15, rotate the raking device K horizontally by the required angle using the rotary shaft mechanism 14, engage the fixed pin 15 in the engagement hole 1e again, and then turn the raking device K. It descends into manhole H in a contracted state. After that, perform the operations (4) and (5) above.

(7) Attach a grab bucket G to the mounting part 21 at the lower end of the lifting post 20 in place of the raking device K,
The grab bucket G is lowered into the manhole H in a closed state.

(8) Using the grab bucket G, scoop up the sludge and soil J that have been scraped up by operating the upper scraping device K (see Figure 6). The grab bag can also easily pass through the opening I of the manhole H in the closed state, so that the capacity of the bag bag is relatively small.

(9) Shrink the lifting post 20 and grab the bucket G
The sludge and earth are lifted to the ground and discharged to a dump truck (not shown), etc.

(10) Repeat steps (7) to (9) above as many times as necessary.

As described above, the sludge and soil J at the bottom of the manhole H
The process involves raking and dredging, but the above steps can be modified as appropriate. That is, step (5)
Followed by steps (7) to (10), and then step (6).
(that is, turning the raking device K by a required angle), and it is possible to carry out step (4) and subsequent steps again. In addition, if the raking device K can be rotated in the manhole H, there is no need to pull it up to the ground each time.

The present invention is not limited to the above-described embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following embodiments are included within the scope of the present invention.

In this embodiment, the plunger 5a of the hydraulic cylinder 5 is pivotally connected to the boom 4, but there is no difference in its operation even if it is pivotally connected to the arm 2 as shown in FIG. In FIG. 7, the same members as in the previous embodiment are given the same reference numerals.

[Effects of the present invention] The earth and sand raking device of the present invention has the above configuration,
When used as described above, it has the following unique effects.

The present invention can easily pass through narrow openings in manholes by retracting the linkage,
By extending and contracting the link mechanism at the bottom of the manhole, it is possible to collect earth and sand over a wide area.

Expansion and contraction of the scraping plate can be performed with a single hydraulic cylinder, and the number of hydraulic cylinders used can be reduced, so the mechanism and operation can be simplified and the weight can be reduced.

Since this device can be rotated horizontally, there is no need to change the mounting position with the lifting post each time, and the scraping board can be reached in a desired direction.

Since the scraping plate of this device can be extended in any direction, the lifting post to which this device is attached does not have to move randomly, and the lifting post only needs to be moved in the vertical direction. The fixing mechanism is simplified.

[Brief explanation of drawings]

The drawings show an embodiment of the earth and sand raking device of the present invention, and FIG. 1 is a partially sectional side view of the raking board of the embodiment in an extended state, and FIG. 2 is a side view of the raking board in a contracted state. The side view and FIG. 3 are X-ray arrow views of FIG. 2, and FIGS.
Figure 6 shows a process diagram of dredging the bottom of a manhole using this raking device. FIG. 7 is a side view of another embodiment of the earth and sand raking device. K... raking device, 1... body frame, 2...
... Arm, 3... Arm with scraping plate, 4... Boom, 5... Hydraulic cylinder, 6... Scraping plate,
13...Mounting bracket, 14...Pin shaft mechanism, 15...Fixing pin.

Claims (1)

[Claims] 1. A four-section link mechanism L consisting of an arm 2, an arm 3 with a scraping plate, and a boom 4 is disposed at the lower part of the main body frame 1, and the linkage mechanism L consisting of the arm 2 or the boom 4 and the main body frame 1 is provided. They are connected to each other with pins by a single hydraulic cylinder 5 between them, and a scraping plate 6 is fixedly installed at the tip of the arm 3 with scraping plate.
A device for raking earth and sand at the bottom of a manhole, characterized in that the device is swingably fixed to the bottom of a manhole via a rotating shaft mechanism 14.