CN-122009995-A - Excavator traction system, control method and engineering machinery

CN122009995ACN 122009995 ACN122009995 ACN 122009995ACN-122009995-A

Abstract

The invention relates to the technical field of excavator traction, in particular to an excavator traction system, a control method and engineering machinery, wherein the traction system is provided with a low traction rope collecting mode, and in the low traction rope collecting mode, an overflow valve group enables the system overflow pressure of a second oil way to be reduced from a first pressure P1 to a third pressure P3; the oil inlet of the first reversing valve V1 is communicated with the second working oil port, high-pressure oil output by the main pump enters the rope collecting oil port of the winch motor M1 through the first reversing valve V1 and the second oil path to realize low-traction rope collecting action, the winch receives a steel wire rope without auxiliary command of other operators, the rope is prevented from being collected to the bottom, and the winch and the rope guider are damaged by the steel wire rope traction pin; the traction system provided by the invention has a free rope releasing mode, and in the free rope releasing mode, the brake oil cylinder G1 releases the brake on the winch motor M1 to realize free rope releasing action, so that the situation that the whole equipment is tipped over is avoided.

Inventors

LIU GANGQIANG
LIU CHUNJIAN
DU SIYUAN
ZHANG ZHAOYANG
ZHANG LU
Heng Zixun
ZHAO ZIFA
WANG HUIBIN
GUO JINGCHAO
YANG WEI
CHEN CHUNJIAN
XIE JINGHE
BAI MINGHUI

Assignees

徐州徐工挖掘机械有限公司
中国石油管道局工程有限公司设备租赁分公司
廊坊市融通石油机械设备有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (10)

1. An excavator traction system for controlling a hoist provided at a counterweight position of an excavator to perform rope winding and unwinding actions, the hoist being for pulling a weight to be climbed, comprising: a main pump and a pilot valve group; the oil inlet of the first reversing valve V1 is connected with the main pump, and the first working oil port and the second working oil port are respectively connected with the rope discharging oil port and the rope collecting oil port of the winch motor M1 through a first oil way and a second oil way, and the oil return port is connected with the oil tank; the first shuttle valve V2 is provided with a first oil inlet and a second oil inlet which are respectively connected with the first oil way and the second oil way; the second shuttle valve V4 is connected with an oil outlet of the first shuttle valve V2 through a first oil inlet, the second oil inlet is connected with an oil outlet of the pilot valve group through a second reversing valve V5, and the oil outlet is connected with the winch brake cylinder G1 through a third reversing valve V7; the second reversing valve V5 and the third reversing valve V7 are used for being conducted in a free rope releasing mode so as to enable the winch motor M1 to release braking; A fourth reversing valve V15 disposed between the main pump and the hoist clutch G2, the fourth reversing valve V15 being configured to be turned on in a free-rope-releasing mode to disconnect the hoist speed reducer from the hoist motor M1; The bidirectional balance valve V3 can be matched with the winch brake cylinder G1 to brake a heavy object towed by the winch motor M1; And the overflow valve group is arranged between the first shuttle valve V2 and the winch motor M1, is configured to adjust the system overflow pressure of the second oil way during rope winding, and is used for enabling the system overflow pressure to be the first pressure P1 in a normal rope winding mode and enabling the system overflow pressure to be the third pressure P3 in a low traction rope winding mode, and the first pressure P1 is larger than the third pressure P3.
2. The excavator traction system of claim 1 wherein the left and right ends of the first reversing valve V1 are connected with a first solenoid valve Y1 and a second solenoid valve Y2, respectively; when the first electromagnetic valve Y1 is electrified, the first reversing valve V1 is positioned at the left position, an oil inlet of the first reversing valve V1 is communicated with a second working oil port, and the first working oil port is communicated with an oil return port; When the second electromagnetic valve Y2 is powered on, the first reversing valve V1 is positioned at the right position, an oil inlet of the first reversing valve V1 is communicated with a first working oil port, and a second working oil port is communicated with an oil return port; When the first electromagnetic valve Y1 and the second electromagnetic valve Y2 are not powered, the first reversing valve V1 is located at the middle position, the oil inlet of the first reversing valve V1 is cut off, and the first working oil port and the second working oil port are both connected with the oil tank.
3. The excavator traction system of claim 1 wherein the second and third reversing valves V5 and V7 are connected with third and fourth solenoid valves Y3 and Y4, respectively; When the third electromagnetic valve Y3 is powered on, the second reversing valve V5 is in a conducting position; when the fourth electromagnetic valve Y4 is electrified, the third reversing valve V7 is in a conducting position.
4. The excavator traction system of claim 1 further comprising: the first pressure reducing valve V6 is arranged between the oil outlet of the second shuttle valve V4 and the third reversing valve V7.
5. The excavator traction system of claim 1 further comprising: a second pressure reducing valve V13 and a check valve V14, which are disposed in this order between the main pump and the fourth reversing valve.
6. The excavator traction system of claim 1 further comprising: an accumulator F4 disposed between the main pump and the fourth reversing valve and a third pressure sensor F3 for detecting the pressure of the accumulator F4; The accumulator F4 is used for outputting pressure oil to a control port of the winch clutch to disconnect the winch speed reducer from the winch motor when the rope releasing mode is free and the main pump is abnormal.
7. The excavator traction system of claim 1 wherein the overflow valve block comprises: The oil inlet of the first overflow valve V8 is connected with the second oil way and is positioned at the downstream of the second oil inlet of the first shuttle valve V2, the oil outlet of the first overflow valve V8 is connected with the first oil way and is positioned at the upstream of the first oil inlet of the first shuttle valve V2, and the overflow pressure of the first overflow valve V8 is the first pressure P1; the oil inlet of the second overflow valve V9 is connected with the second oil way through the throttle valve V10 and is positioned at the downstream of the second oil inlet of the first shuttle valve V2 and at the upstream of the oil inlet of the first overflow valve V8, and the oil outlet of the second overflow valve V9 is connected with the first oil way and is positioned at the upstream of the first oil inlet of the first shuttle valve V2 and at the downstream of the oil outlet of the first overflow valve V8; The control port of the second overflow valve V9 is connected with the hydraulic oil tank through a fifth reversing valve V11 and a third overflow valve V12, and the overflow pressure of the third overflow valve V12 is the third pressure P3, when the fifth reversing valve V11 is conducted, the overflow pressure of the second overflow valve V9 is changed into the third pressure P3; Wherein the second pressure P2 is greater than the first pressure P1 and greater than the third pressure P3; In a normal rope collecting mode, the fifth reversing valve V11 is closed, and the system overflow pressure of the second oil circuit is the first pressure P1; In the low traction rope-winding mode, the fifth reversing valve V12 is turned on, and the system overflow pressure of the second oil path is the third pressure P3.
8. The excavator traction system of claim 1 further comprising: the first pressure sensor F1 and the second pressure sensor F2 are respectively used for detecting the pressure of a high-pressure cavity of the winch motor M1 when the winch unreels and the winch receives the rope.
9. A control method of an excavator traction system, characterized by being performed based on the excavator traction system according to any one of claims 1-8, the control method comprising: In a conventional rope releasing mode, an oil inlet of a first reversing valve V1 is communicated with a first working oil port, high-pressure oil output by a main pump enters a rope releasing oil port of a winch motor M1 through the first reversing valve and a first oil way to realize conventional rope releasing action, and a heavy object pulled by the winch motor M1 is braked through a bidirectional balance valve V3 and a winch mechanism oil cylinder G1 when the conventional rope releasing action is finished; In a conventional rope collecting mode, the overflow valve group enables the system overflow pressure of the second oil way to be the first pressure P1, an oil inlet of the first reversing valve V1 is communicated with the second working oil port, and high-pressure oil output by the main pump enters a rope collecting oil port of the winch motor M1 through the first reversing valve V1 and the second oil way to realize conventional rope collecting action; The oil inlet of the first reversing valve V1 is communicated with the second working oil port, high-pressure oil output by the main pump enters the rope collecting oil port of the winch motor M1 through the first reversing valve V1 and the second oil path to realize low-traction rope collecting action, and the weight pulled by the winch motor M1 is stopped through the bidirectional balance valve V3 and the winch motor actuating cylinder G1 when the low-traction rope collecting action is finished; In the free rope releasing mode, the second reversing valve V5, the third reversing valve V7 and the fourth reversing valve V15 are conducted, the pilot oil output by the pilot valve group enters a rodless cavity of a brake cylinder G1 through the second reversing valve V5, the second shuttle valve V4 and the third reversing valve V7, the brake cylinder G1 releases the brake on a winch motor M1, high-pressure oil output by a main pump enters a control port of a winch clutch G2 through the fourth reversing valve V15, and a winch speed reducer is disconnected with the winch motor M1 to realize free rope releasing.
10. An excavator comprising the excavator traction system of any one of claims 1 to 8.

Description

Excavator traction system, control method and engineering machinery Technical Field The invention relates to the technical field of excavators, in particular to an excavator traction system, a control method and engineering machinery. Background When working in mountain regions, the excavator has higher climbing capacity, and can climb up a 35-degree slope at most. However, most engineering machines and other heavy objects have no climbing capacity and cannot work together with the excavator, so that the excavator is required to firstly descend the slope and repair the road, and the other engineering machines can pass through the road. The method of descending slope and repairing the zigzag road can cause the damage of large occupied area, changed landform and vegetation damage. In addition, the earth surface soil body is deeply disturbed in the construction process, so that the earth surface of the equipment channel is loose and uneven in hardness. And great difficulty and safety risk are brought to subsequent construction. Disclosure of Invention The invention aims to provide an excavator traction system, a control method and engineering machinery, wherein a winch and the excavator traction system are arranged at the counterweight position of the excavator to carry out traction climbing on heavy objects under a slope, and the excavator traction system can assist the heavy objects to carry out effective climbing so as to avoid damaging the ground surface. In a first aspect, the present invention provides an excavator traction system for controlling a hoist provided at a counterweight position of an excavator to perform rope winding and unwinding actions, the hoist being for hauling a weight requiring climbing, comprising: a main pump and a pilot valve group; the oil inlet of the first reversing valve V1 is connected with the main pump, and the first working oil port and the second working oil port are respectively connected with the rope discharging oil port and the rope collecting oil port of the winch motor M1 through a first oil way and a second oil way, and the oil return port is connected with the oil tank; the first shuttle valve V2 is provided with a first oil inlet and a second oil inlet which are respectively connected with the first oil way and the second oil way; the second shuttle valve V4 is connected with an oil outlet of the first shuttle valve V2 through a first oil inlet, the second oil inlet is connected with an oil outlet of the pilot valve group through a second reversing valve V5, and the oil outlet is connected with the winch brake cylinder G1 through a third reversing valve V7; the second reversing valve V5 and the third reversing valve V7 are used for being conducted in a free rope releasing mode so as to enable the winch motor M1 to release braking; A fourth reversing valve V15 disposed between the main pump and the hoist clutch G2, the fourth reversing valve V15 being configured to be turned on in a free-rope-releasing mode to disconnect the hoist speed reducer from the hoist motor M1; The bidirectional balance valve V3 can be matched with the winch brake cylinder G1 to brake a heavy object towed by the winch motor M1; And the overflow valve group is arranged between the first shuttle valve V2 and the winch motor M1, is configured to adjust the system overflow pressure of the second oil way during rope winding, and is used for enabling the system overflow pressure to be the first pressure P1 in a normal rope winding mode and enabling the system overflow pressure to be the third pressure P3 in a low traction rope winding mode, and the first pressure P1 is larger than the third pressure P3. Optionally, the left end and the right end of the first reversing valve V1 are respectively connected with a first electromagnetic valve Y1 and a second electromagnetic valve Y2; when the first electromagnetic valve Y1 is electrified, the first reversing valve V1 is positioned at the left position, an oil inlet of the first reversing valve V1 is communicated with a second working oil port, and the first working oil port is communicated with an oil return port; When the second electromagnetic valve Y2 is powered on, the first reversing valve V1 is positioned at the right position, an oil inlet of the first reversing valve V1 is communicated with a first working oil port, and a second working oil port is communicated with an oil return port; When the first electromagnetic valve Y1 and the second electromagnetic valve Y2 are not powered, the first reversing valve V1 is located at the middle position, the oil inlet of the first reversing valve V1 is cut off, and the first working oil port and the second working oil port are both connected with the oil tank. Optionally, the second reversing valve V5 and the third reversing valve V7 are respectively connected with a third electromagnetic valve Y3 and a fourth electromagnetic valve Y4; When the third electromagnetic valve Y3 is powered on, the second re