JPS582405Y2 - Sludge scraper load detection device - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent fluctuations beyond the permissible range other than minute changes in the load applied to a cheno equipped with a large number of flights or packets in sludge scrapers, sand scrapers, etc. This invention relates to a device that can quickly detect when a problem occurs.

In sludge scrapers, etc., thermal relays, SE relays, etc. are commonly used to detect motor overload of the drive device, and direct detection methods include using a bearing on the support shaft of the sprocket wheel that engages the chain. A device has been proposed that is configured to slide in the longitudinal direction of the pond, and a load meter is provided in the sliding direction to detect the load on the chain.

This is a necessary device to prevent the motor from becoming overloaded and burnt out due to the load applied to the chain, or even from cutting the chain and intertwining with each other, and causing serious damage to the sprocket wheel and shaft. It is.

However, this condition cannot be visually observed from above the water in opaque muddy water, and must be detected mechanically or electrically. However, with the above method, even if the overload of the chain can be detected, the chain may come off, etc. It is not possible to detect a light load that is less than a predetermined load.

In view of this, the present invention was developed with the aim of detecting overloads more quickly and also detecting light loads other than the allowed minute changes such as material settling and changes in paint film thickness. I will explain based on this.

In the figure, reference numeral 1 denotes an endless chain 7 that is strung up to be driven along the bottom of a sand settling basin, sludge treatment basin, etc. Although not shown, two or more endless chains 71 are usually arranged in parallel depending on the width of the basin. A chain is stretched across the chain, and a large number of flights are provided between both chains so as to be substantially orthogonal to the chain, and these flights are used to drive the chain to scrape up sludge, silt, etc. that has settled on the bottom of the pond. The sprocket wheel 71 is meshed with the sprocket wheel 2 so that a part of the sprocket wheel 71 runs along the bottom of the pond.

One of the sprocket wheels is provided so as to be swung by the load applied to the chain.

That is, as shown in FIG. 2 and below, a support shaft 4 is provided protruding from a base 3 provided on the bottom of the pond or on the inner side wall of the pond, and one end of a lever 5 of a required length is engaged with this support shaft 4. The lever 5 is swingable about a support shaft 4 and supports a sprocket shaft 6 on which a sprocket wheel 2 is wedged at the tip of the lever 5.

In addition, a load detector 7 is provided on a part of the base 3 facing one side of the swinging side of the lever 5, and the other side of the lever is pressed by an adjustment screw 8 provided on the base 3. This causes the lever 5 to apply a preset load and initial load to the load detector 7.

Therefore, the load detector and adjustment screw provided on the base 3 are provided facing each other with the lever in the swinging direction of the lever.
In this case, an elastic body 9 made of rubber, synthetic rubber, synthetic resin, etc., or a spring with a low spring constant (a plate spring, a disc spring, etc.) is interposed between the tip of the adjusting screw 8 and the lever 5.

In general, the material for the support parts on both sides of the load detector and the pressure part at the tip of the screw may have a rough finish, or if soft material is used, the material may become flattened over time, or the material may not be painted. If applied, this coating may peel off, and further, the dimensions between the adjustment screw and the load cell may change minutely due to temperature changes.

Due to this dimensional change, the distortion of the load cell also changes, and the load display changes, often resulting in malfunction.

In such a case, the allowable minute changes as described above are absorbed by the elastic body 9 so that the load detector does not operate in response to minute changes in load that do not hinder the operation of the sludge scraper, etc.
This is done so that the indicated load of the load cell does not change.

Moreover, even if the movement of the adjustment screw is increased by sandwiching the elastic body 9, the change in load is reduced, so that adjustment can be easily performed.

In addition, an initial tension is applied to the endless chain of the raking machine so that it can operate normally.

Therefore, when carrying out the work of raking up sludge, etc. from the bottom of the pond through the flight equipped with the Cheno, by driving the Cheno,
Normal raking work is performed when the load is applied to the cheno and flight within the allowable range.

However, if for some reason an overload exceeding the allowable range is applied to the chain, the tension of the chain applies a force that moves the sprocket wheel in the direction of the arrow, and the wheel uses the support shaft 4 as a fulcrum and the lever 5 moves in the direction of the arrow. direction, that is, the direction of the resultant force of the chain tension.

This swinging of the lever applies a pressing force higher than the set pressure to the load detector, which acts on the load detector, which extracts this as an electrical signal and issues an alarm (not shown) or stops the motor of the drive device. However, the application of this overload can be quickly detected to prevent unexpected accidents.

Furthermore, if the chain becomes loose due to use, or if it comes off the sprocket wheel or breaks, and the tension on the sprocket wheel becomes O or below the set load, the load detector will immediately detect this light load and issue an alarm. This is to prevent accidents as mentioned above by causing the machine to stop or stop the entire machine.

According to the present invention, the change in tension of the chain is realized by the swinging of the lever, and the amount of swinging of this lever is detected as a load change, and the initial load is applied to this lever without adjustment. Because of this, it is possible to quickly detect overloads on the cheno as well as light loads below the set value.Furthermore, by changing the length of the lever and the installation position of the load detector, the load detection sensitivity can be adjusted as desired, and the The elastic body absorbs the minute changes that are allowed, such as falling or peeling off of the paint film, and the detector is designed not to operate, so it has the advantage of always being able to accurately detect load changes. be.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the sand scraper, Figure 2 is a front view of the main parts,
Fig. 3 is a plan view of the same, Fig. 4 is a sectional view taken in the direction of the arrow in Fig. 2, and Fig. 5 is a plan view of the same.
The figure is an enlarged view of the screw tip. 1...Cheno, 2...Sprocket wheel, 3...Base, 4...Spindle, 5
...Lever, 6...Sprocket shaft,
7...Load detector, 8...Adjustment,
9...Elastic body.

Claims (1)

[Scope of utility model registration request] A sprocket wheel that tensions a chain with flights designed to scrape up sludge, etc. is supported by the tip of a lever that swings in the direction of tension on the chain via the sprocket shaft, and the load applied to the chain is reduced by the swinging of this lever. A load detection device for a sludge scraper, comprising a load detector and an elastic body at the tip of an adjustment screw that presses the lever against the detector to absorb minute changes allowed. .