CN-121976997-A - Distributed oil temperature control system and control method suitable for monorail crane

CN121976997ACN 121976997 ACN121976997 ACN 121976997ACN-121976997-A

Abstract

The invention belongs to the technical field of monorail crane oil temperature control, and particularly relates to a distributed oil temperature control system and method suitable for a monorail crane. The variable hydraulic pump comprises a variable hydraulic pump, a high-pressure filter, at least one radiating part, a pilot control oil way, a pilot overflow valve group and a shuttle valve, wherein an oil suction port of the variable hydraulic pump is connected with a hydraulic oil tank, an inlet of the high-pressure filter is connected with an oil outlet of the variable hydraulic pump, the radiating part is connected in series with an outlet oil way of the high-pressure filter, the pilot control oil way comprises a pilot overflow valve group, a temperature control valve group and a shuttle valve, a port P of the pilot overflow valve group is connected with an oil outlet of the high-pressure filter, a port A of the pilot overflow valve group is connected with an outlet of the radiating part, a port T of the temperature control valve group is connected with the hydraulic oil tank and used for sensing the oil temperature of a system, a port A of the shuttle valve is connected with an outlet of the temperature control valve group, and a port R of the shuttle valve group is connected with an port X of the variable hydraulic pump, wherein the temperature control valve group is used for adjusting the pilot control oil pressure according to the change of the oil temperature, and the shuttle valve is used for controlling the displacement of the variable hydraulic pump to realize the self-adaptive regulation of the speed of the cooling fan.

Inventors

LIU JIQUAN
LIU YONGLIANG
ZHAO YONGHONG
WU YU
TANG PENGJU
PEI MINGYAO
CHEN BO
FENG HAITAO
JIA YAN
CHEN LI
PAN ZHEN
WANG ZHUORAN
ZHANG LIANJUN
LI ZHE
LI XIAOYING

Assignees

太原煤科检测技术有限公司
中国煤炭科工集团太原研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260128

Claims (10)

1. A distributed oil temperature control system for a monorail crane, comprising: A variable hydraulic pump (1) with an oil suction port connected with a hydraulic oil tank (12); A high-pressure filter (2) with an inlet connected with an oil outlet of the variable displacement hydraulic pump (1); at least one heat radiating part connected in series to an outlet oil path of the high-pressure filter (2), each of the heat radiating parts including a hydraulic motor (6), a cooler (4) and a fan (5) driven by the hydraulic motor (6) connected in sequence; The pilot control oil way comprises a pilot overflow valve group (8), a temperature control valve group (10) and a shuttle valve (11); the P port of the pilot overflow valve group (8) is connected with an oil outlet of the high-pressure filter (2), and the A port is connected with an outlet of the heat dissipation part; The P port of the temperature control valve group (10) is connected with a control oil outlet of the pilot overflow valve group (8), and the T port is connected with a hydraulic oil tank (12) and used for sensing the system oil temperature; An A port of the shuttle valve (11) is connected with an outlet of the temperature control valve group (10), and an R port of the shuttle valve is connected with an X port of the variable displacement hydraulic pump (1); The temperature control valve group (10) is used for adjusting pilot control oil pressure according to oil temperature change, and the shuttle valve (11) is used for controlling the discharge capacity of the variable hydraulic pump (1) so as to realize self-adaptive regulation and control of the rotating speed of the cooling fan.
2. The distributed oil temperature control system for a monorail crane of claim 1, further comprising an external control oil circuit; the external control oil way comprises an adjustable throttle valve (13) and an electric control hydraulic valve group (9); The P port of the electric control hydraulic valve group (9) is connected with an oil outlet of the high-pressure filter (2) through the adjustable throttle valve (13), the X port is connected with the B port of the shuttle valve (11), and the T port and the R port are both connected with the hydraulic oil tank (12); The electrically controlled hydraulic valve block (9) is arranged to receive an external control signal to forcibly regulate the pilot control oil pressure to the control port of the variable displacement hydraulic pump (1).
3. The distributed oil temperature control system suitable for the monorail crane, as set forth in claim 2, wherein the electrically controlled hydraulic valve block (9) is an explosion-proof electrohydraulic control valve, and has an unloading position for leading pilot control oil to return to the oil tank and a working position for establishing pilot control oil pressure.
4. A distributed oil temperature control system for a monorail crane as defined in claim 1, wherein the number of the heat dissipating parts is three, and the three heat dissipating parts are distributed in a serial manner at the head, the body and/or the tail of the monorail crane.
5. A distributed oil temperature control system suitable for a monorail crane according to claim 1, further comprising a one-way valve (7); The check valve (7) is connected in parallel between an inlet and an outlet of the hydraulic motor (6), and is opened when the variable hydraulic pump (1) stops oil supply or the displacement is extremely small, so as to form a compensation loop and prevent the hydraulic motor (6) from sucking air.
6. A distributed oil temperature control system for a monorail crane according to claim 1, wherein the temperature control valve assembly (10) is a temperature-sensitive automatic control valve configured to minimize the outlet oil pressure drop when the oil temperature is below a set point and to raise the outlet oil pressure when the oil temperature reaches or exceeds the set point.
7. The distributed oil temperature control system suitable for the monorail crane of claim 1, wherein the cooler (4) is of a copper pipe sheet type structure, when hydraulic oil flows through an internal channel of the cooler, forced air quantity generated by the fan (5) carries out heat convection, and the air quantity is in direct proportion to temperature drop.
8. The distributed oil temperature control system suitable for the monorail crane according to claim 1, further comprising a thermometer (3), wherein the thermometer (3) is arranged on a hydraulic oil path and is used for monitoring and displaying the real-time oil temperature of the system and providing basis for external control signals of the electric control hydraulic valve group (9).
9. -An oil temperature control method employing a distributed oil temperature control system for a monorail crane according to any one of claims 1 to 8, comprising the steps of: s1, sucking hydraulic oil from a hydraulic oil tank (12) through a variable hydraulic pump (1) and pressurizing and outputting the hydraulic oil; s2, sensing the oil temperature of the hydraulic system through a temperature control valve group (10), and automatically adjusting the pressure of a pilot control oil way based on an oil temperature signal; When the oil temperature is lower than a set value, controlling the temperature control valve group (10) to reduce the pilot control oil pressure at the outlet of the temperature control valve group, and keeping the variable hydraulic pump (1) to be at the minimum displacement; when the oil temperature reaches or exceeds a set value, the temperature control valve group (10) is controlled to enable the pilot control oil pressure of an outlet of the temperature control valve group to rise, and the variable hydraulic pump (1) increases the displacement; S3, receiving an external control signal through an electric control hydraulic valve group (9) and forcibly adjusting the pressure of a pilot control oil way; when forced cooling is needed, an external control signal drives an electric control hydraulic valve group (9) to establish pilot control oil pressure, so that the displacement of the variable hydraulic pump (1) is improved; When the low-temperature state is required to be maintained, an external control signal drives an electric control hydraulic valve group (9) to release pilot control oil, so that the displacement of the variable hydraulic pump (1) is reduced; And S4, driving a hydraulic motor (6) in the heat dissipation part through hydraulic oil output by the variable hydraulic pump (1), and driving a fan (5) to rotate by the hydraulic motor (6) to generate cooling air quantity.
10. The oil temperature control method according to claim 9, wherein when the variable displacement hydraulic pump (1) stops supplying oil or the displacement is abruptly reduced, a compensation circuit is formed by opening a check valve (7) connected in parallel between an inlet and an outlet of the hydraulic motor (6), and suction of the hydraulic motor (6) due to inertial rotation is prevented.

Description

Distributed oil temperature control system and control method suitable for monorail crane Technical Field The invention belongs to the technical field of monorail crane oil temperature control, and particularly relates to a distributed oil temperature control system and method suitable for a monorail crane. Background Currently, an monorail crane is used as one of underground advanced transportation equipment of a coal mine, and is widely applied to coal mine production, and hydraulic driving is one of important driving modes of the monorail crane. The hydraulic drive has the advantages of large hydraulic driving force, stepless speed change and the like, but the hydraulic system has the advantages of internal leakage, throttling loss and the like, and the power loss is embodied in a heat form, so that the heat dissipation problem is one of the key problems to be solved in the design of the hydraulic drive monorail crane. The current oil temperature control system of the overhead monorail on the coal mine generally adopts a quantitative system and a single radiator, has no heat induction capacity, has poor speed regulation performance, poor heat dissipation performance, poor economy and difficult system arrangement, has little research on variable speed regulation and self-adaptive association, and does not appear in association systems. The invention has positive significance for improving the heat dissipation performance of the monorail crane and improving the safe operation level of equipment. At present, no distributed oil temperature control system suitable for a monorail crane is arranged on domestic coal mines. Disclosure of Invention The invention aims to solve the problems and provides a distributed oil temperature control system and a control method suitable for a monorail crane. The invention adopts the following technical scheme that the distributed oil temperature control system suitable for the monorail crane comprises: the oil suction port of the variable hydraulic pump is connected with the hydraulic oil tank; The inlet of the high-pressure filter is connected with the oil outlet of the variable hydraulic pump; at least one heat dissipation part connected in series to an outlet oil path of the high-pressure filter, each heat dissipation part comprising a hydraulic motor, a cooler and a fan driven by the hydraulic motor, which are connected in sequence; the pilot control oil way comprises a pilot overflow valve group, a temperature control valve group and a shuttle valve; The port P of the pilot overflow valve bank is connected with an oil outlet of the high-pressure filter, and the port A is connected with an outlet of the heat dissipation part; the P port of the temperature control valve group is connected with a control oil outlet of the pilot overflow valve group, and the T port of the temperature control valve group is connected with a hydraulic oil tank and used for sensing the oil temperature of the system; the port A of the shuttle valve is connected with the outlet of the temperature control valve group, and the port R of the shuttle valve is connected with the port X of the variable hydraulic pump; the temperature control valve group is used for adjusting pilot control oil pressure according to oil temperature change, and the shuttle valve is used for controlling the displacement of the variable hydraulic pump to realize self-adaptive regulation and control of the rotating speed of the cooling fan. In some embodiments, an external control oil circuit is further included; The external control oil way comprises an adjustable throttle valve and an electric control hydraulic valve group; the P port of the electric control hydraulic valve group is connected with an oil outlet of the high-pressure filter through the adjustable throttle valve, the X port is connected with the B port of the shuttle valve, and the T port and the R port are both connected with a hydraulic oil tank; The electrically controlled hydraulic valve block is configured to receive an external control signal to forcibly regulate pilot control oil pressure to the variable displacement hydraulic pump control port. In some embodiments, the electrically controlled hydraulic valve block is an explosion-proof electro-hydraulic control valve having an unloading position to return pilot control oil to the tank and an operating position to establish pilot control oil pressure. In some embodiments, the number of heat sinks is three, which are distributed in a serial manner at the nose, fuselage and/or tail position of the monorail hoist. In some embodiments, a one-way valve is also included; The check valve is connected in parallel between an inlet and an outlet of the hydraulic motor, and is opened when the variable hydraulic pump stops oil supply or the displacement is extremely small, so that a compensation loop is formed, and the hydraulic motor is prevented from sucking air. In some embodiments, the temperature-sensing valv