JPH0421008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for avoiding rake overload of arm swing type dust removers installed in small and medium-sized rivers, irrigation canals, etc.

[Conventional technology]

If the screen is clogged with debris or obstructions such as cans, bottles, lumber, etc., this debris will overload the rake.
In this case, the structure is such that the dust remover is stopped midway by a pressure switch provided in the hydraulic circuit of the arm hydraulic cylinder.

This stopped rake and the dust scraped up by the rake act as obstacles and block the flow of water passing through the screen, resulting in drawbacks such as overflow of the waterway.

[Problem to be solved by the invention]

The present invention solves such drawbacks, and when an overload occurs on the rake, the cause of the overload is removed without stopping the dust remover, and the operation is automatically restarted. Even if the cause (dust) cannot be removed, the rake will not be stopped in the waterway, so the flow of water will not be blocked by the rake and the dirt raised by this rake, so the waterway can be maintained. It is a technical problem to provide a workaround for rake overload in arm-swing dust removers that does not overflow and can be used safely.

[Means to solve the problem]

An arcuate, comb-shaped screen 2 is provided in the waterway 1, and side walls 1 of the waterway 1 on the left and right in front of the screen 2 are provided.
An arm swing comprising an arm 3 swingably provided between the upper a and a rake 4 reversibly provided at the tip of the arm 3, and an arm hydraulic cylinder 5 and a rake hydraulic cylinder 6 for operating the arm 3 and rake 4. In the type dust remover, when an overload of more than a predetermined value is applied when the rake 4 is raised, the arm 3 is temporarily stopped from rising and the rake 4 is rotated backward to remove the overload, and then the arm 3 is The avoidance method involves raising the screen again, inverting the rake 4 again at the upper end of the screen, that is, at the rest position, lowering the arm 3, removing the obstacle by a scraping operation, and then continuing the dust removal work again.

[Effect]

FIG. 3 shows that the dust 7 flowing into the waterway 1 is captured by the screen 2 when the machine is in this rest state.

When a predetermined amount of dust 7 is captured on the screen 2, the arm hydraulic cylinder 5 is activated to pull the arm rod 14, and the arm cylinder crank 16 rotates forward, and the arm rotation shaft 15 rotates accordingly. Then, the arm 3 is rotated downward as shown in FIG. 4, and the arm 3 is rotated to the position shown in FIG. 5, that is, in a substantially vertical direction, and then stopped.

In this state, when the rake hydraulic cylinder 6 is activated and the rake rod 9 is pushed, the rake cylinder crank 10 rotates downward, causing the crankshaft 11 to rotate, and in conjunction with this, the rake crank 12 rotates upward, causing the rake rod 20 to rotate. is pulled rearward, and the rake 4 pivots or closes forward about the pivoting connection part 13 as a fulcrum, as shown in FIG. 6, and begins to rake up the garbage 7.

Next, when the arm hydraulic cylinder 5 is actuated to push the arm rod 14, the arm cylinder crank 16 rotates rearward as shown in FIG. 7, and the arm rotation shaft 15 rotates accordingly. As shown in FIG. 8, the rake 4 rotates upward and scrapes up the dust 7.

When the arm 3 rises to the top as shown in FIG. 9, the scraping ends, and the scraper 8 then operates to discharge the garbage 7 to the outside.

The above operation is the normal operation, but if the rake 4 hits the garbage 7 that is stagnant in the middle of the screen 2 and an overload of more than a predetermined value is applied to the rake 4, a brake is installed in the hydraulic circuit of the arm hydraulic cylinder 5. The pressure switch 21 operates, and the operation of the arm hydraulic cylinder 5 is stopped, and the lifting of the arm 3 is temporarily stopped.At the same time, the rake hydraulic cylinder 6 is activated, and the rake 4 is moved to the 10th position.
The overload on the rake 4 is removed by pivoting or opening it rearward as shown.

When the overload is removed, the pressure switch 21 is activated, the arm hydraulic cylinder 5 is actuated, and the arm 3 is raised to the top as shown in FIG.

Subsequently, the rake hydraulic cylinder 6 is actuated to raise or close the rake 4 as shown in FIG.

In the state shown in FIG. 12, when the arm hydraulic cylinder 5 is operated and the arm 3 is rotated and lowered as shown in FIG. 13, the rake 4 moves backward in a closed state and performs a scraping operation. Scrape off the dust 7 stuck on 2.

The arm 3 and rake 4 are then lowered to the lowest position shown in FIG.

In this state, when the arm 3 is raised as described above, the dirt 7 that has been scraped off by the rake 4 is scraped up again, and when the arm 3 is raised to the top, the scraping is finished.

If the dust 7 cannot be removed even after this, the above operation is repeated several times, and if it is difficult to remove the dust 7, it is finally removed manually.

〔Example〕

The dust remover in the drawing shows a case in which the rake hydraulic cylinder 6 is installed outside the waterway 1, and a hollow cylindrical arm rotation shaft 15 is mounted between bearings 18 provided on the left and right side rods of the machine frame 17. The lower end of an arm cylinder crank 16 is fixed to one end of this arm rotation shaft 15.

A crankshaft 11 is disposed within this arm rotation shaft 15, bearing the center and left and right ends of this crankshaft 11, and a rake crank 12 is protruded from the center of this crankshaft 11, and the arm cylinder crank 1
A rake cylinder crank 10 is protruded from one end of the rake hydraulic cylinder 6, and a rake rod 9 of the rake hydraulic cylinder 6 is pivotally connected to the rake cylinder crank 10.

A balance weight 19 is provided at the rear end of the arm 3.

Overload detection of the rake 4 is carried out by providing a pressure switch 21 in the hydraulic circuit of the arm hydraulic cylinder 5 as shown in the hydraulic circuit diagram shown in FIG. to stop the arm hydraulic cylinder 5 and operate the rake hydraulic cylinder 6 to rotate the rake 4 backwards, and when there is no overload again, the pressure switch 2 is turned on.
1 works to operate the rake hydraulic cylinder 6 and the arm hydraulic cylinder 5 to reverse the rake 4 again,
The diagram shows a case in which the arm 3 is raised to scrape up, and 22 is a scraper hydraulic cylinder;
23 is a flow regulator, 24 is a solenoid valve, 25 is a relief modular valve, 26 is a pressure gauge, 27 is a gauge tamper, 28 is a check valve, 29 is a gear pump, 30 is a strainer, and 31 is an oil tank.

〔Effect of the invention〕

Since the present invention is constructed as described above, the rake 4
When an overload was applied to the machine, the rake 4 was rotated backwards to remove the overload without stopping the dust remover on the spot, and the rake 4 was automatically reversed again to remove dust. It is excellent in workability because it continues the process, and it also has rake 4 in the middle of screen 2.
To provide an arm swing type dust remover which is excellent in safety such that a waterway 1 does not overflow because the flow of water is not blocked because the water flow is not stopped or the garbage 7 is not stagnated.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a slope view of the arm swing type dust remover, Fig. 2 is a front view of its main parts, and Figs. 3 to 14 are operational diagrams of the machine. , FIG. 15 is a hydraulic circuit diagram. 1... Channel, 1a... Side wall, 2... Screen, 3... Arm, 4... Rake, 5... Arm hydraulic cylinder, 6... Rake hydraulic cylinder.

Claims (1)

[Claims] 1 An arc-shaped comb-shaped screen is installed in the waterway,
An arm is swingably provided between the side walls of the left and right channels in front of this screen, a rake is provided at the tip of this arm so that it can be reversed, and an arm swing equipped with an arm hydraulic cylinder and a rake hydraulic cylinder that operate this arm and rake. In the type dust remover,
When an overload exceeding a predetermined level is applied while the rake is rising, the arm will temporarily stop rising and the rake will be rotated backward to remove the overload, and then the arm will be raised again and the upper end of the screen, i.e. the rest This method for avoiding overload of an arm swing type dust remover is characterized in that the rake is reversed again at the position, the arm is lowered, and after removing an obstacle by a scraping operation, dust removal work is continued again.