CN-117108573-B - Self-adaptive limiting cylinder with pressure feedback for coal roadway support

Abstract

The invention belongs to the technical field of coal roadway support, and particularly relates to a self-adaptive limiting cylinder with pressure feedback for coal roadway support; the hydraulic oil cylinder device comprises a hydraulic oil tank, an overflow valve, a constant flow oil source, an oil inlet filter, a three-position six-way directional control valve, a hydraulic control one-way valve, a shuttle valve, a cylinder locking valve, a supporting oil cylinder, a counterweight and other accessories, wherein when the supporting oil cylinder supports a coal roadway top plate, the hydraulic oil flow entering a rodless cavity of the supporting oil cylinder is automatically controlled according to a pressure feedback system formed by the hydraulic control one-way valve and the shuttle valve, so that the hydraulic oil cylinder rod of the supporting oil cylinder contacts the coal top and automatically limits when the preset pretightening force is achieved, and the supporting oil cylinder or the coal roadway top plate is prevented from being damaged. The hydraulic support device is simple in control logic, can reduce labor intensity of workers, reduces energy consumption of a hydraulic system, and improves the working efficiency of the support oil cylinder on the coal roadway roof.

Inventors

• LI ZHI
• YANG LE
• CUI SHIMIN
• ZHAO XIAOCHUN
• FENG LU
• GUO HAO
• Yue Chaoqi
• ZHAO PENGCHENG
• MA TIANZHOU
• KANG YANPING
• Fan Sancheng
• Zhao haixing
• LI HONGWEI
• DAI LIMING
• LI BAOXIU

Assignees

• 中国煤炭科工集团太原研究院有限公司
• 山西天地煤机装备有限公司

Dates

Publication Date

20260512

Application Date

20230921

Claims (4)

1. 1. The self-adaptive limit oil cylinder for the coal roadway support with the pressure feedback comprises a support oil cylinder (9) and is characterized in that a hydraulic system for controlling the support oil cylinder (9) is connected with a hydraulic control check valve (6) and a shuttle valve (7) to jointly form a pressure feedback system, wherein the hydraulic system comprises a reversing valve and a hydraulic oil tank (1); An oil inlet of the hydraulic control one-way valve (6) is connected with a control oil port of a rodless cavity oil port of the reversing valve connecting support oil cylinder (9), an oil outlet of the hydraulic control one-way valve (6) is connected with the hydraulic oil tank (1), a control oil port of the hydraulic control one-way valve (6) is connected with an oil outlet of the shuttle valve (7), and A, B oil inlets of the shuttle valve (7) are respectively connected with the rodless cavity oil port of the support oil cylinder (9); The hydraulic control method comprises the steps that after the pressure of rodless cavity oil ports of N supporting oil cylinders (9) is compared through working oil ports of shuttle valves (7), the obtained highest supporting oil cylinder (9) rodless cavity pressure is used as a feedback signal, and an oil outlet of the shuttle valves (7) acts on a hydraulic control one-way valve (6) to control the oil ports, so that the hydraulic control one-way valve (6) is opened, control oil ports of reversing valves directly return to a hydraulic oil tank (1), oil supply of a hydraulic system to the supporting oil cylinders (9) is cut off, and further stretching operation of the supporting oil cylinders (9) is stopped; The hydraulic control device is characterized in that a lock cylinder valve (8) is arranged between the support cylinder (9) and the reversing valve, an oil inlet of the lock cylinder valve (8) is connected with a control oil port of a rodless cavity oil port of the support cylinder (9) through the reversing valve, an oil outlet of the lock cylinder valve (8) is connected with the rodless cavity oil port of the support cylinder (9) and used for protecting the operation state of the support cylinder (9) and preventing misoperation, and the control oil port of the lock cylinder valve (8) is connected with the control oil port of the rod cavity oil port of the support cylinder (9) through the reversing valve.
2. 2. The self-adaptive limiting cylinder with pressure feedback for coal roadway support, which is disclosed in claim 1, is characterized in that the hydraulic system further comprises an overflow valve (2), an oil inlet of the overflow valve (2) is communicated with an oil inlet of a reversing valve, and an oil outlet of the overflow valve (2) is directly connected back to a hydraulic oil tank (1) for preventing the hydraulic system from being damaged due to pressure increase of the system.
3. 3. The self-adaptive limiting cylinder with pressure feedback for coal roadway support according to claim 2, wherein the hydraulic system further comprises an oil inlet filter (4) for cleaning and filtering oil supplied to the hydraulic system by an oil source.
4. 4. The coal roadway support self-adaptive limiting cylinder with pressure feedback according to claim 2, wherein the reversing valve is a three-position six-way directional control valve (5), a T port of the three-position six-way directional control valve (5) is connected with a hydraulic oil tank (1), an A port of the three-position six-way directional control valve (5) is connected with an oil inlet of a cylinder locking valve (8), a B port of the three-position six-way directional control valve (5) is respectively connected with a rod cavity oil port of a support cylinder (9) and a control oil port of the cylinder locking valve (8), a rodless cavity oil port of the support cylinder (9) is connected with an oil outlet of the cylinder locking valve (8), a P port of the three-position six-way directional control valve (5) is connected with an oil outlet of an oil inlet filter (4), and an oil inlet of a hydraulic control one-way valve (6) is connected with an A port of the three-position six-way directional control valve (5).

Description

Self-adaptive limiting cylinder with pressure feedback for coal roadway support Technical Field The invention belongs to the technical field of coal roadway support, and particularly relates to a self-adaptive limiting cylinder with pressure feedback for coal roadway support. Background The hydraulic cylinder has the characteristics of high scalability, high impact load resistance, easy operation and the like, and is widely applied to temporary support of coal mine and coal rock roadway. At present, the temporary support cylinder of the coal and rock roadway is roughly divided into an equipment carrying type cylinder and a single type cylinder, wherein the equipment carrying type cylinder is controlled by a control valve group, whether the cylinder support top plate is in place or not is manually operated by equipment operators according to site conditions during operation, and the single type cylinder is manually pressed after being transported to a designated place by the support operators until the cylinder rod of the cylinder supports the coal roadway top plate. In a word, the control of the existing supporting oil cylinder is mostly manually operated, the operation efficiency is low, the manual labor intensity is high, and the supporting oil cylinder cannot judge whether the oil cylinder rod is supported in place or not during the temporary supporting operation of the coal mine tunnel. Disclosure of Invention The invention aims to solve the problem that the existing supporting oil cylinder cannot judge whether an oil cylinder rod supports in place or not during temporary supporting operation of a coal mine and rock roadway. The invention provides a technical scheme that a coal roadway support self-adaptive limiting oil cylinder with pressure feedback comprises a support oil cylinder, a hydraulic system for controlling the support oil cylinder is connected with a hydraulic control one-way valve and a shuttle valve to jointly form a pressure feedback system, wherein the hydraulic system comprises a reversing valve and a hydraulic oil tank; An oil inlet of the hydraulic control one-way valve is connected with a control oil port of the rodless cavity oil port of the support oil cylinder through the reversing valve, an oil outlet of the hydraulic control one-way valve is connected with a hydraulic oil tank, a control oil port of the hydraulic control one-way valve is connected with an oil outlet of the shuttle valve, and oil inlets of A, B of the shuttle valves are respectively connected with the rodless cavity oil port of the support oil cylinder; And after the pressure of rodless cavity oil ports of the N supporting oil cylinders is compared through the shuttle valve working oil ports, the obtained highest supporting oil cylinder rodless cavity pressure is used as a feedback signal, and the hydraulic control one-way valve is controlled through the shuttle valve oil outlet to open the hydraulic control one-way valve, so that the hydraulic oil of the control oil port of the reversing valve directly returns to the hydraulic oil tank, the oil supply of the hydraulic system to the supporting oil cylinders is cut off, and the stretching operation of the supporting oil cylinders is stopped. Further, a locking cylinder valve is arranged between the supporting cylinder and the reversing valve, an oil inlet of the locking cylinder valve is connected with a control oil port of the reversing valve, which is connected with a rodless cavity oil port of the supporting cylinder, an oil outlet of the locking cylinder valve is connected with a rodless cavity oil port of the supporting cylinder, and the locking cylinder valve is used for protecting the operating state of the supporting cylinder and preventing misoperation, and a control oil port of the locking cylinder valve is connected with a control oil port of the reversing valve, which is connected with a rod cavity oil port of the supporting cylinder. The locking cylinder valve ensures that the supporting cylinder can keep a fixed extension state when no action signal exists, and can play a role in buffering the supporting cylinder when the roof of the coal roadway is deformed under the rock burst, so that the supporting cylinder is prevented from being damaged by overload pressure, and the supporting cylinder lever can realize a certain contraction amount under the condition that the buffer effect ensures that the pressure of a rodless cavity of the supporting cylinder does not change. Further, the hydraulic system also comprises an overflow valve, an oil inlet of the overflow valve is communicated with an oil inlet of the reversing valve, and an oil outlet of the overflow valve is directly connected back to the hydraulic oil tank, so that the hydraulic system is prevented from being damaged due to pressure increase of the system. Further, the hydraulic system also comprises an oil inlet filter which is used for cleaning and filtering oil provided by an oil source to