CN106185662A - A kind of hoisting hydraulic system being applicable to crawler crane - Google Patents

Abstract

The invention discloses a winch hydraulic system suitable for a crawler crane, which comprises a control oil circuit and a high-pressure oil circuit, a control oil circuit quantitative pump arranged on the control oil circuit, and a main pump arranged on the high-pressure oil circuit , one-way valve, fourth electromagnetic reversing valve and high-pressure accumulator, engine, third electromagnetic reversing valve and low-pressure accumulator. The drive shaft of the engine is connected to the control oil circuit quantitative pump and the main pump, which are used together with the main pump to provide power for the crane; the third electromagnetic reversing valve is connected to the low-pressure accumulator and The outlet of the quantitative pump of the control oil circuit, the low-pressure accumulator is used to stabilize the pressure of the control oil circuit. The outlet of the main pump is connected to the one-way valve, and the fourth electromagnetic reversing valve is connected to the one-way valve and the high-pressure accumulator, and the high-pressure accumulator is used to turn the The potential energy of the weight is recovered and stored for hoisting motion.

Description

A winch hydraulic system suitable for crawler cranes

technical field

The invention belongs to the related field of cranes, and more specifically relates to a winch hydraulic system suitable for crawler cranes.

Background technique

The crawler crane is a mobile crane that installs the lifting part on the crawler chassis and relies on the crawler device for walking. It can carry out operations such as material lifting, transportation, loading and unloading, and installation. Crawler cranes have the advantages of small grounding specific pressure, small turning radius, adaptability to harsh ground, large climbing capacity, good lifting performance, no need for outriggers for lifting operations, and can walk with load, etc. Add special devices to become grab cranes, electromagnetic cranes or piling machines, etc., to realize one machine with multiple functions, and perform pile and earthwork operations. It is widely used in electric power construction, municipal construction, bridge construction, petrochemical, water conservancy and hydropower and other industries.

However, due to the large change in the working load and load power of the crane, when the heavy object falls, the potential energy of the heavy object decreases sharply and is lost in vain, which cannot be effectively used, resulting in energy waste and reduced utilization.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the present invention provides a winch hydraulic system suitable for crawler cranes, which is designed for the winch hydraulic system based on the working characteristics of the crane. The winch hydraulic system uses the main pump and the engine to provide power for the crane, reducing the installed power required by the engine; meanwhile, the winch hydraulic system is also equipped with a high-pressure accumulator and a low-pressure accumulator , the high-pressure accumulator is used to recover and store the potential energy of the heavy object when the heavy object falls, so that it can be used when lifting the heavy object, which improves the utilization rate; the low-pressure accumulator is used to stably control the pressure of the oil source , to ensure the stability of the system. In addition, the hoist hydraulic system also uses a hydraulic transformer as a control element to replace the original main valve, which avoids throttling loss and improves transmission efficiency.

In order to achieve the above object, the present invention provides a winch hydraulic system suitable for crawler cranes, which includes a control oil circuit and a high-pressure oil circuit, a control oil circuit quantitative pump arranged on the control oil circuit, a control oil circuit quantitative pump arranged on the high-pressure oil circuit, Main pump, one-way valve, fourth electromagnetic reversing valve and high-pressure accumulator, engine, third electromagnetic reversing valve, low-pressure accumulator, first hydraulic transformer, second hydraulic transformer, first electromagnetic reversing Directional valve, second electromagnetic reversing valve, main winch motor and auxiliary winch motor, characterized in that:

The drive shaft of the engine is connected to the control oil circuit quantitative pump and the main pump, which are used together with the main pump to provide power for the crane; the third electromagnetic reversing valve is connected to the low-pressure accumulator and The outlet of the quantitative pump of the control oil circuit, the low-pressure accumulator is used to stabilize the pressure of the control oil circuit;

The outlet of the main pump is connected to the one-way valve, and the fourth electromagnetic reversing valve is connected to the one-way valve and the high-pressure accumulator, and the high-pressure accumulator is used to turn the The potential energy of the weight is recovered and stored for hoisting motion;

The first hydraulic transformer and the second hydraulic transformer are connected to the high-pressure oil circuit in parallel, and the first electromagnetic reversing valve is connected to the first hydraulic transformer and the main winch motor; the second The electromagnetic reversing valve is connected to the auxiliary winch motor and the second hydraulic transformer; the winch hydraulic system controls the main winch motor and the second hydraulic transformer through the first hydraulic transformer and the second hydraulic transformer respectively. Auxiliary winch motor.

Further, the main pump is a quantitative pump.

Further, the winch hydraulic system also includes a first filter, a second filter, a third filter and a fourth filter; The device and the second filter are connected to the oil cylinder.

Further, the winch hydraulic system also includes a safety valve, the safety valve is connected to the third filter and the high-pressure oil circuit between the check valve and the main pump, and the third filter is connected to in the cylinder.

Further, the winch hydraulic system also includes a low-pressure relief valve, the low-pressure relief valve is connected to the control oil circuit and the fourth filter, and the fourth filter is connected to the oil cylinder; The low-pressure relief valve is used to control the pressure of the control oil source of the control oil circuit.

Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention provide a winch hydraulic system suitable for crawler cranes. The winch hydraulic system uses a main pump and an engine to provide Power reduces the required installed power of the engine; at the same time, the winch hydraulic system is also equipped with a high-pressure accumulator and a low-pressure accumulator, and the high-pressure accumulator is used to reduce the weight of the heavy object when it falls. The potential energy of the object is recovered and stored for use when the heavy object rises, which improves the utilization rate; the low-pressure accumulator is used to stably control the pressure of the oil source to ensure the stability of the system. In addition, the hoist hydraulic system also uses a hydraulic transformer as a control element to replace the original main valve, which avoids throttling loss and improves transmission efficiency.

Description of drawings

Fig. 1 is a block diagram of a winch hydraulic system suitable for a crawler crane provided by a preferred embodiment of the present invention.

In all drawings, the same reference numerals are used to represent the same elements or structures, wherein: 1-engine, 2-control oil circuit quantitative pump, 3-main pump, 4-safety valve, 5-low pressure relief valve , 6-first electromagnetic directional valve, 7-second electromagnetic directional valve, 8-check valve, 9-first hydraulic transformer, 10-second hydraulic transformer, 11-low pressure accumulator, 12-third Electromagnetic directional valve, 13-fourth electromagnetic directional valve, 14-high pressure accumulator, 15-first filter, 16-second filter, 17-third filter, 18-fourth filter, 19 -Main hoist motor, 20-Auxiliary hoist motor.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

Please refer to Fig. 1 , the winch hydraulic system suitable for a crawler crane provided by a preferred embodiment of the present invention is formed with a control oil circuit and a high-pressure oil circuit. The hoist hydraulic system includes an engine 1, a control oil circuit quantitative pump 2, a main pump 3, a safety valve 4, a low-pressure relief valve 5, a first electromagnetic reversing valve 6, a second electromagnetic reversing valve 7, a check valve 8. The first hydraulic transformer 9, the second hydraulic transformer 10, the low pressure accumulator 11, the third electromagnetic reversing valve 12, the fourth electromagnetic reversing valve 13, the high pressure accumulator 14, the first filter 15, the second A filter 16 , a third filter 17 , a fourth filter 18 , a main hoisting motor 19 and an auxiliary hoisting motor 20 . The control oil circuit quantitative pump 2 is arranged on the control oil circuit. The main pump 3 , the one-way valve 8 , the fourth electromagnetic reversing valve 13 and the high-pressure accumulator 14 are arranged on the high-pressure oil circuit.

The drive shaft of the engine 1 is connected to the control oil circuit quantitative pump 2 and the main pump 3, which together with the main pump 3 are used to provide power for the crane. In this embodiment, the main pump 3 is a quantitative pump. The outlet of the control oil circuit quantitative pump 2 is connected to the low-pressure accumulator 11 through the third electromagnetic reversing valve 12, and the low-pressure accumulator 11 is used to stabilize the pressure of the control oil circuit to ensure Stability of the hoist hydraulic system. The inlet of the control oil circuit quantitative pump 2 is connected to the oil cylinder through the first filter 15 .

The outlet of the main pump 3 is connected to the one-way valve 8, and the fourth electromagnetic reversing valve 13 is connected to the one-way valve 8 and the high-pressure accumulator 14, and the high-pressure accumulator 14 is used for When the heavy object descends, the potential energy of the heavy object is recovered and stored for driving other hoisting motions. The fourth electromagnetic valve 13 is used for releasing the pressure of the high-pressure accumulator 14 . The inlet of the main pump 3 is connected to the oil cylinder through the second filter 16 .

The safety valve 4 is connected to the high-pressure oil circuit, specifically, the safety valve 4 is connected to the high-pressure oil circuit between the one-way valve 8 and the main pump 3 . The safety valve 4 is connected to the oil cylinder through the third filter 17 .

The low-pressure relief valve 5 is connected to the control oil circuit and the fourth filter 18, and the fourth filter 18 is connected to the oil cylinder. In this embodiment, the low-pressure relief valve 5 is used to control the maximum pressure of the control oil source of the control oil circuit.

The port A of the first hydraulic transformer 9 and the port A of the second hydraulic transformer 10 are connected to the high pressure oil circuit in parallel, and the first electromagnetic reversing valve 6 is connected to the main winch motor 19 and the Port B of the first hydraulic transformer 9 is described. The second electromagnetic reversing valve 7 is connected to port B of the second hydraulic transformer 10 and the auxiliary winch motor 20 . The winch hydraulic system controls the main winch motor 19 and the auxiliary winch motor 20 respectively through the first hydraulic transformer 9 and the second hydraulic transformer 10, thereby realizing the lifting or whereabouts.

In this embodiment, the number of the main hoisting motor 19 and the number of the auxiliary hoisting motors 20 are one; it can be understood that in other embodiments, the number of the main hoisting motor 19 and the auxiliary hoisting motor The number of winch motors 20 can be increased according to actual needs.

The winch hydraulic system suitable for crawler cranes provided by the present invention, the winch hydraulic system uses the main pump and the engine to provide power for the crane, which reduces the installed power required by the engine; at the same time, the winch The hydraulic system is also equipped with a high-pressure accumulator and a low-pressure accumulator. The high-pressure accumulator is used to recover and store the potential energy of the heavy object when the heavy object falls, so that it can be used when the heavy object rises, which improves the utilization rate ; The low-pressure accumulator is used to stably control the pressure of the oil source to ensure the stability of the system. In addition, the hoist hydraulic system also uses a hydraulic transformer as a control element to replace the original main valve, which avoids throttling loss and improves transmission efficiency.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (5)

1. A winch hydraulic system suitable for crawler cranes, comprising a control oil circuit and a high-pressure oil circuit, a control oil circuit quantitative pump arranged on the control oil circuit, a main pump arranged on the high-pressure oil circuit, a single directional valve, fourth electromagnetic directional valve and high pressure accumulator, engine, third electromagnetic directional valve, low pressure accumulator, first hydraulic transformer, second hydraulic transformer, first electromagnetic directional valve, second electromagnetic directional valve Directional valve, main winch motor and auxiliary winch motor, characterized in that: The drive shaft of the engine is connected to the control oil circuit quantitative pump and the main pump, which are used together with the main pump to provide power for the crane; the third electromagnetic reversing valve is connected to the low-pressure accumulator and The outlet of the quantitative pump of the control oil circuit, the low-pressure accumulator is used to stabilize the pressure of the control oil circuit; The outlet of the main pump is connected to the one-way valve, and the fourth electromagnetic reversing valve is connected to the one-way valve and the high-pressure accumulator, and the high-pressure accumulator is used to turn the The potential energy of the weight is recovered and stored for hoisting motion; The first hydraulic transformer and the second hydraulic transformer are connected to the high-pressure oil circuit in parallel, and the first electromagnetic reversing valve is connected to the first hydraulic transformer and the main winch motor; the second The electromagnetic reversing valve is connected to the auxiliary winch motor and the second hydraulic transformer; the winch hydraulic system controls the main winch motor and the second hydraulic transformer through the first hydraulic transformer and the second hydraulic transformer respectively. Auxiliary winch motor. 2. The winch hydraulic system suitable for crawler cranes according to claim 1, wherein the main pump is a quantitative pump. 3. The winch hydraulic system suitable for crawler cranes according to claim 1, wherein the winch hydraulic system further comprises a first filter, a second filter, a third filter and a fourth filter ; The quantitative pump of the control oil circuit and the main pump are respectively connected to the oil cylinder through the first filter and the second filter. 4. The hoisting hydraulic system suitable for crawler cranes according to claim 3, characterized in that: the hoisting hydraulic system further includes a safety valve, and the safety valve is connected to the third filter and the one-way filter. The high-pressure oil circuit between the valve and the main pump, the third filter is connected to the oil cylinder. 5. The hoisting hydraulic system suitable for crawler cranes according to claim 3, characterized in that: the hoisting hydraulic system further includes a low-pressure relief valve, and the low-pressure relief valve is connected to the control oil circuit and the The fourth filter is connected to the oil cylinder; the low-pressure relief valve is used to control the pressure of the control oil source of the control oil circuit.