SU524760A1 - Hydraulic boom self-propelled crane - Google Patents

Description

one

The invention relates to the field of hydraulic actuators used, for example, in mechanisms for lifting cargo, boom and extension of boom sections of jib self-propelled cranes,

Known hydraulic actuators in which the pump is connected by pipelines with the distributor reverse. The distributor of the reverse is connected by pipelines with a hydraulic engine. Moreover, a one-way throttle and a controlled one-way hydraulic lock are installed on the line connecting the distributor to the hydraulic engine discharge cavity when the cargo is lowered, the boom and the boom sections are expanded. With this adjustment, only one speed is obtained during lifting and lowering, and the lowering speed is determined by the throttle on the drain.

The presence of only one speed in known hydraulic drives leads to a decrease in productivity in construction. The adjustment to obtain, for example, the landing speed is made by reducing the flow area (throttling) in the distributor manually by keeping the distributor knob in the low flow position. Such a hold on the handle cannot ensure the consistency of the flow through the distributor and is practically difficult to implement and the lowering speed is constant. This difficulty is further aggravated by the fact that adjustments are required over a wide range.

The aim of the invention is to provide three predetermined speeds of movement of the crane actuator.

For this, a three-way three-way valve with two-way lock is connected to the drain line via two parallel-mounted check valves with two throttles.

The drawing shows the proposed hydraulic drive.

The hydraulic actuator includes a pump 1, which is hydraulically connected to the reversing valve 2 and the throttle valve 3, as well as to the safety valve 4.

Claims (1)

The safety valve 4 is connected by pipeline to the tank 5. One connector of the consumer of the distributor 2 reverse is hydraulically connected to the cavity 6 of the hydraulic motor and to the safety valve 8, as well as through the hydraulic line of the control to a one-way operated hydraulic lock 9. The safety valve 8 is connected by pipeline to the tank 5. The other the consumer of the distributor 2 reverse is hydraulically connected with a one-way throttle 10, with a controllable one-way lock 9, and through a one-way throttle 11c with a cavity 12 bodies 7. Consumer fittings The distributor 3 is throttled through a two-way hydraulic lock 13 by two parallel branches hydraulically connected to the drainage line when lowered. On one of these branches there is a choke 14 and a check valve 15, on the other choke 16 and a check valve 17. Distributor plugs of the distributor 2 The reverse and distributor 3 are throttled hydraulically connected to tank 5. All throttles (single-sided 1O and 11 and double-sided 14 and 16) have different throughput. The throughput capacity of the chokes 11 is not less than the total throughput of the chokes 10 and 14, as well as chokes 1O and 16. The one-way choke 11 is installed to ensure safety when the pipelines on the discharge line are broken during lowering to keep the load from falling. The hydraulic actuator works as follows. When the right position is turned on in the distributor 2, the pump 1 feeds oil into the cavity 12 of the hydraulic actuator 7. In this case, the load or boom is lifted or the boom sections are extended. When lifting, only one speed is provided. When you turn on the left position in the distributor 2, the pump 1 feeds oil into the cavity 6 of the executive hydraulic motor 7. This lowers the load or boom or advances the boom sections. When lowering, three speeds are provided. First speed - distributor 3 is in neutral position. Oil from pump 1 through distributor 2 enters the cavity 6 of the hydraulic engine 7. Oil is drained from the cavity 12 of the hydraulic engine 7 through a one-way throttle 11, controlled by one-way hydraulic lock 9, one-way throttle 10, and distributor 2 through the pipeline to the tank 5. At that, the speed lowering is determined by throttle 10. This is a lower speed. The oil flow through the distributor 3 is locked with a two-way hydraulic lock 13. The second speed when lowering - in the distributor 3 the right position is turned on. In this case, one stream of oil flowing from the cavity 12 of the hydraulic engine 7 is the same; like at first speed. Another additional flow passes through the check valve 15, throttle 14, two-way lock 13, valve 3 through the pipeline to the tank 5. In this case, the lowering speed is determined by the sum of the flow through the throttles 1O and 14, the second speed is greater than the first. The third speed when lowering - in the distributor 3, the left position is turned on. In this case, one stream of oil, flowing from the cavity 12 of the hydraulic engine-bodies 7, is the same as at the first speed. Another additional flow passes through the check valve 17, throttle 16, two-way lock 13, valve 3 through the pipeline to the tank 5. The lowering speed in this case is determined by the sum of the flow through the throttles 10 and 16. If the throughput of throttles 16 is greater than at drossel 14, then a third speed is more than a second. In the circuit, instead of said chokes, chokes with a capacity independent of the viscosity of the oil, adjustable chokes, valve boxes with regulators, etc. can be installed. Instead of the specified B scheme of the hydraulic cylinder, a hydraulic motor can be installed. Claims of the invention A hydraulic boom of a self-propelled boom crane, for example, load lifting mechanisms, made in the form of a hydraulic motor fed from a pump along a pressure and discharge line through a reverse distributor with a throttle and a hydraulic lock, characterized in that in order to ensure the specified displacement speeds actuator of the crane, to the drain main is connected through two parallel installed check valves with two throttles three-position valve with two-way lock .