Hydraulic controlling system for mining concrete pump

Abstract

The invention discloses a hydraulic controlling system for a mining concrete pump and relates to a mining concrete pump. The hydraulic controlling system comprises an oil tank, a pump and a main oil cylinder A and a main oil cylinder B which drive a concrete cylinder A and a concrete cylinder B; the system also comprises a swinging cylinder A and a swinging cylinder B which drive an S-shaped tubeto switch the swinging between the concrete cylinder A and the concrete cylinder B, a three-position four-way hydraulic control reverse valve S and a two-position four-way hydraulic control reverse valve E; the swinging cylinder A and the swinging cylinder B are provided with a control oil port BA and a control oil port BB respectively; the main cylinder A and the main oil cylinder B are providedwith a control oil port ZA and a control oil port ZB respectively; the three-position four-way hydraulic control reverse valve S is provided with a hydraulic control reversing device; the hydraulic control reversing device is provided with a control oil port SA and a control oil port SB which are connected with the control oil port BA and the control oil port BB respectively; the two-position four-way hydraulic control reverse valve E is provided with a hydraulic control reversing device; and the hydraulic control reversing device is provided with a control oil port EA and a control oil port EB which are connected with the control oil port ZA and the control oil port ZB respectively. The hydraulic controlling system has full hydraulic mutual-control, does not need electric control, has nomechanical collision and removes the hidden trouble of safety of underground construction of a coal mine.

Description

technical field [0001] The invention relates to a hydraulic control system of a mine concrete pump, in particular to a hydraulic control system of a mine concrete pump with full hydraulic mutual control. Background technique [0002] In recent years, as the country has increased investment in infrastructure construction, the concrete machinery market has also developed rapidly. Among them, concrete pumps play an important role in the increasingly vigorous construction market. Domestic concrete pumps have also experienced from scratch, from weak to Strong development history. At present, domestic concrete pumps are more and more accepted by users because of their stable quality and high cost performance. According to incomplete statistics, domestic concrete pumps occupied more than 85% of the domestic market and 15% of the international market in 2007. [0003] The key technical transformation project of my country's coal industry-gobside entry retention technology is a maj...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that if you want to use a concrete pump to work underground, you must solve two explosion-proof problems: one is the explosion-proof of the main motor, and the other is the explosion-proof of the electrical control system.

[0008] If a motorized reversing valve is used, the advantage is that no electrical control system is required, which effectively solves the problem of explosion protection and reduces costs. The disadvantage is that the mechanical structure is relatively complicated, and sparks are likely to be generated when the cam of the motorized reversing valve collides with the impact block, which will cause serious damage to underground construction. Security brings hidden dangers

In addition, when the swing cylinder changes direction, the speed is extremely fast, generally within 0.3 seconds, such a high impact speed will also affect the service life of the motor valve and the impact block

[0009] It can be seen from the above that although the above two methods can solve the explosion-proof problem of concrete pumps in underground construction to a certain extent, there are still obvious safety hazards.

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