Special Asphalt Removal Tool Hydraulic Excavator Design (figure) - Hydraulic Excavators -

In order to improve the utilization of

In order to improve the utilization of

excavator, a machine could have become a direction for product development, especially excavator crushing, demolition tools and quick-change feature is most commonly used excavator through the broken hammer, cut, etc. are removed with the installation, can be further expanded range of applications, allowing users to reduce equipment purchase costs, thus being more and more popular. Xuzhou Excavator Manufacture Co., Ltd. to meet the market needs, design the installation of hammers, scissors and quickly removed for installation of special oil line, the excavator of a truly multi-functional machine.

Breaker hydraulic system diagram 1, the working principle of oil circuit breaker

Oil circuit breaker design is relatively simple, according to the host of the basic performance and parameters, to ensure the rated pressure and flow in the premise, select the appropriate breaker to match with the host.

Shown in Figure 1, using 3 as the main valve control circuit stand together, to a second relief valve adjusted to the rated working pressure breaker; pilot control valve 2 to achieve by foot breaker operations remote control. The broken oil line oil line with other host differences mainly in the following two aspects: First, the main oil line in the rotary valve 4 is 2 Two-mechanical valve, oil line between the two configurations to meet the switch mechanical rotary valve and solenoid valve, although the low degree of automation, but to avoid the impact of the high pressure of the components, but also greatly reduce the cost; Secondly, the pilot valve with a locking mechanism with two-way foot valve, its main oil Road Correspondingly, oil circuit configuration can be applied to two kinds of remote control.

When using hammers, first determine the 2-way valve after the pedal lock step on the direction of whether the onset, and then transferred to a broken valve mode switch, then step forward foot valve, so that hammers at work 6 state (ie, breaker against the state). After the foot pedal valve is in a locked state.

Demolition shear hydraulic system diagram 2, removal of cutting oil circuit works

In general, removal of cut usually has four control circuit, breaker of the asphalt than the much more complex. Following the removal of the company for cutting oil circuit design are briefly summarized for reference.

Demolition shears oil line (see Figure 2) and host of other functions do not share, according to the characteristics of removal of cutting oil line itself, using the required removal of shear cylinder pressure difference between the two cavities, the main valve will spare United 3 secondary relief valve a, b adjusted to remove cut its work meets the pressure, but also to meet the work pressure breaker, oil circuit breaker will cut and remove the two oil line (removed cut the opening and closing) share, without affecting the overall performance of the host has reached an integrated, simple technology.

(1) remove the opening and closing cut: cut the opening and closing and removal of broken pipe with the main oil line of work, common pilot operation mode, only 4 in the rotary valve oil circuit switching is different: Back to the fuel tank is broken mode, back to the main valve for the removal of shear mode. When using the removal of cut closed, first open the two-way foot valve 2 on the locking mechanism, and then mechanical rotary valve 4 to the hydraulic shear mode switch, this time before the foot pedal valve opening for the removal of shear, after stepping foot Tap valve closed for the removal of shear.

(2) removal of the rotary cut: rotary cutting demolition when the oil pressure and flow than the removal of cut is much smaller when they closed, but the use of pilot oil source, its pressure and flow are very small. Many manufacturers usually outside the engine power take similar size population to increase access to drive gear pump means, and through a simple four-way valve to achieve the removal of the three rotary cutting. However, no additional power take off for the host population is more difficult to achieve this end, consider the main valve to take the oil source, and development and design of the independent control valve 8, to achieve removal of cutting oil line distribution. The valve uses the principle of load sensing valve, the pressure not only to ensure they meet the flow. Pilot valve with two-way foot valve 7, the left and right rotation of hydraulic shear, and electromagnetic valve, the linear effect of superior. Simple operation, before stepping foot valve counter-clockwise rotating hydraulic shear, hydraulic shear, after stepping foot valve clockwise rotation.

by: gaga

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