Protective device for chain jump and chain breakage

Abstract

The invention provides a protective device for chain jump and chain breakage of a shallow slot trigger. A chain is disposed respectively on two sides of the shallow slot trigger. The shallow slot trigger comprises a head wheel, a supporting roller and a tail wheel. Each chain extends from the head wheel, passes through the supporting roller, and reaches the tail wheel. A fixing shaft is installed at the position of the head wheel, and a shaft sleeve capable of rotating freely around the fixing shaft is installed on the fixing shaft. The protective device for chain jump and chain breakage comprises a feeler lever and a monitoring system. One end of the feeler lever is fixed with the shaft sleeve, and the other end of the feeler lever abuts against the chain. The monitoring system comprises two approach switches which are connected in series, and each approach switch is disposed beside the fixing shaft of each of the two sides of the shallow slot trigger. The protective device for chain jump and chain breakage is simple to manufacture, sensitive and reliable to use, small in daily maintenance amount and convenient to overhaul.

Description

technical field [0001] The invention relates to a chain skipping and chain breaking protection device for a shallow groove scraper machine. Background technique [0002] In the coal mining industry, it is often necessary to separate minerals. An important sorting equipment used is a shallow tank dense medium separator, which completes the sorting process by density in a gravity field with the help of a suspension. In this process, the raw coal is fed from the feed end of the dense medium shallow tank separator, and the suspension is introduced from the bottom of the feed chute to form horizontal flow and ascending flow for separation. The floating coal overflows naturally along with the horizontal flow to the overflow edge, and the sunken coal sinks to the bottom of the sorting tank and is lifted to the top by the shallow tank scraper machine and discharged through the chute. [0003] The shallow tank scraper machine has a large workload and serious wear and corrosion, whic...

AI Technical Summary

Problems solved by technology

[0006] However, the common disadvantage of the existing underspeed stall protection devices for shallow groove scraper machines is that when the scraper machine skips chains or one side of the chain breaks, the protection device cannot initiate action, so that it cannot be blocked and shut down in time, which further worsens the fault

[0007] The common disadvantages of the existing chain breaking protection devices for shallow groove scraper machines are: (1) when the scraper interval becomes larger due to chain cutting or other reasons, this protection device is prone to malfunction; (2) ) The broken chain protection device is greatly affected by the tightness of the chain of the scraper machine. If the chain of the scraper machine is too loose or too tight, the protection device will malfunction and the reliability is poor; (3) The chain break protection device spans the The upper part of the sorting shallow tank occupies a large part of the maintenance space of the shallow tank. When the scraper machine replaces the liner and chain, the space is limited, resulting in inconvenient maintenance.

[0008] In short, the current protective devices for shallow groove scrapers generally have the problems of unreliable operation and inability to act sensitively in the event of chain breakage or chain skipping faults

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