A diesel engine monorail crane locomotive drive clamping automatic control system

Abstract

The invention discloses a diesel engine monorail crane locomotive drive clamping automatic control system, including a main pump, a driving motor, a pressure sensor, a controller, a clamping oil cylinder, a clamping control valve, and an auxiliary pump. The driving motor is connected to the main pump oil circuit, the main pump A oil port is connected to the controller through a pressure sensor, and the main pump B oil port is connected to the controller through a pressure sensor. The pressure sensor obtains the pressure values ​​of the A and B oil ports of the main pump and transmits them to the controller. The controller obtains the pressure difference after calculation and outputs the pressure difference electric signal. The auxiliary pump is connected to the P port oil circuit of the clamping control valve, the A port of the clamping control valve is connected to the rod chamber oil circuit of the clamping oil cylinder, the clamping control valve includes an electric proportional pressure reducing valve and a two-position two-way hydraulically controlled reversing valve, the controller is electrically connected to the electric proportional pressure reducing valve, and the valve port opening of the electric proportional pressure reducing valve is controlled by using the electric signal converted from the pressure difference, thereby adjusting the clamping force of the driving wheel on the track, so that the monorail crane can operate safely and normally in various operating conditions.

Description

Technical Field

[0001] The invention relates to the technical field of monorail cranes, and in particular to an automatic control system for driving and clamping a diesel engine monorail crane locomotive. Background Art

[0002] During the operation of the monorail crane, multiple sets of drives provide driving force, and the driving force is formed by the friction generated by the tension provided by the clamping cylinder of the drive unit pressing the driving wheel against the track. Since the underground working conditions of the monorail crane are relatively complex, such as heavy-load and large-slope operation requires a larger clamping force, and unloaded flat tunnel operation requires a smaller clamping force, if the clamping force is too small, the monorail crane is prone to slipping during operation; if the clamping force is too large, it will cause serious heating of the system and cause certain damage to the drive shaft. Summary of the invention

[0003] The purpose of the present invention is to provide a diesel engine monorail crane locomotive drive clamping automatic control system, which can realize automatic adjustment of the clamping force of the clamping cylinder on the track to achieve safe operation of the monorail crane under various operating conditions.

[0004] To achieve the above-mentioned purpose, the present invention provides a diesel engine monorail crane locomotive drive clamping automatic control system, comprising a main pump, a drive motor, a pressure sensor, a controller, a clamping oil cylinder, a clamping control valve, and an auxiliary pump, wherein the main pump is a bidirectional variable pump, the drive motor is a bidirectional fixed motor, the main pump is connected to the drive motor pipeline, the main pump A oil port is connected to the controller through the pressure sensor, the main pump B oil port is connected to the controller through the pressure sensor, the pressure sensor is used to obtain the pressure values ​​of the A and B oil ports of the main pump, and convert the pressure values ​​into electrical signals and send them to the controller, and the controller calculates the two. The auxiliary pump is connected to the P port oil circuit of the clamping control valve, and the A port of the clamping control valve is connected to the rod chamber oil circuit of the clamping cylinder. The pressure oil of the auxiliary pump enters the rod chamber of the clamping cylinder through the clamping control valve to control the extension and retraction of the clamping cylinder to press the driving wheel onto the track. The clamping control valve comprises an electric proportional pressure reducing valve and a two-position two-way hydraulically controlled reversing valve. The electric proportional pressure reducing valve is connected to the left position oil circuit of the two-position two-way hydraulically controlled reversing valve. The controller is electrically connected to the electric proportional pressure reducing valve to control the valve port opening of the electric proportional pressure reducing valve through the pressure difference electric signal.

[0005] Furthermore, it also includes a switching valve and a lifting motor, the switching valve is a two-position four-way electromagnetic reversing valve, and in the working position, the oil outlet of the auxiliary pump is connected to the lifting motor oil circuit through the P port and A port of the switching valve.

[0006] Furthermore, in the normal position of the switching valve, the oil outlet of the auxiliary pump is connected to the P port oil circuit of the clamping control valve through the P port and B port of the switching valve; the X port of the switching valve is connected to the K port oil circuit of the two-position two-way hydraulically controlled reversing valve.

[0007] Furthermore, it also includes a manual reversing valve, which is a two-position three-way reversing valve. The oil outlet of the auxiliary pump passes through the P port and B port of the switching valve and enters the A port and P port of the manual reversing valve and is connected to the P port oil circuit of the clamping control valve.

[0008] The beneficial effects of the present invention are as follows: by setting a pressure sensor, the pressure value of the AB port of the main pump is obtained, which is converted into an electrical signal and sent to the controller. The controller generates a pressure difference after calculation and controls the electromagnetic proportional pressure reducing valve to adjust the amount of pressure oil entering the rod chamber of the clamping cylinder, thereby adjusting the clamping force of the drive motor on the track; by setting a lifting motor, the lifting motor is controlled by the pressure oil of the auxiliary pump, and the clamping force of the drive motor to the track can be guaranteed to remain unchanged; when the monorail crane is not used for a long time, it can be unloaded through the manual reversing valve to extend the service life of the monorail crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the control principle diagram of the hydraulic system of the present invention;

[0010] In the figure, 1-main pump, 2-driving motor, 3-pressure sensor, 4-controller, 5-switching valve, 6-hoisting motor, 7-clamping cylinder, 8-clamping control valve, 9-electric proportional pressure reducing valve, 10-two-position two-way hydraulically controlled reversing valve, 11-manual reversing valve, 12-overflow valve, 13-auxiliary pump. DETAILED DESCRIPTION

[0011] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0012] The monorail crane uses a special I-beam hanging above the roadway as the track. The track has an I-shaped longitudinal section with a web in the middle. There are driving wheels on both sides of the web. The driving wheels on both sides are pressed against the web by the clamping cylinder. The driving motor drives the driving wheels to rotate, and the driving wheels move by the friction with the web. Figure 1As shown, a diesel engine monorail crane locomotive driving clamping automatic control system includes a main pump 1, a driving motor 2, a pressure sensor 3, a controller 4, a clamping oil cylinder 7, a clamping control valve 8, and an auxiliary pump 13, wherein the main pump 1 is a bidirectional variable pump, the driving motor 2 is a bidirectional fixed motor, the main pump 1 is connected to the driving motor 2 by pipeline, the main pump 1A oil port is connected to the controller 4 through the pressure sensor 3, and the main pump 1B oil port is connected to the controller 4 through the pressure sensor 3. The pressure sensor 3 is used to monitor the pressure difference between the A and B oil ports of the main pump 1, and convert the pressure difference into an electrical signal to send to the controller 4. The auxiliary pump 13 is connected to the P port oil circuit of the clamping control valve 8, and the A port of the clamping control valve 8 is connected to the rod chamber oil circuit of the clamping oil cylinder 7. The pressure oil of the auxiliary pump 13 enters the rod chamber of the clamping oil cylinder 7 through the clamping control valve 8 to control the extension and contraction of the clamping oil cylinder 7 and press the driving wheel onto the track. The clamping oil cylinder 7 is a single-acting cylinder. The clamping control valve 8 includes an electric proportional pressure reducing valve 9 and a two-position two-way hydraulic control reversing valve 10. The electric proportional pressure reducing valve 9 is connected to the left oil circuit of the two-position two-way hydraulic control reversing valve 10. The controller 4 is electrically connected to the electric proportional pressure reducing valve 9, and the valve port opening of the electric proportional pressure reducing valve 9 is controlled by a pressure difference electric signal. The above hydraulic system can use a pressure sensor 3 to detect the pressure value of the two oil ports of the main pump 1, convert it into an electric signal and transmit it to the controller 4. The controller 4 calculates the pressure difference between the two oil ports and outputs an electric signal to control the electric proportional pressure reducing valve 9, adjust the valve core displacement of the electric proportional pressure reducing valve, change the output pressure of the A port of the clamping control valve 8, thereby changing the thrust of the clamping cylinder 7, and then changing the clamping force between the driving wheel and the track, so that the monorail crane can flexibly adjust the clamping force when facing different operating conditions such as no-load and climbing, to ensure safe operation and normal operation. The main pump 1 and the auxiliary pump 13 share an oil tank, and a relief valve 12 is also provided at the oil outlet of the auxiliary pump 13.

[0013] The system also includes a switching valve 5 and a lifting motor 6. The switching valve 5 is a two-position four-way electromagnetic reversing valve. In the working position, the oil outlet of the auxiliary pump 13 is connected to the oil circuit of the lifting motor 6 through the P port and the A port of the switching valve 5. In the normal position of the switching valve 5, the oil outlet of the auxiliary pump 13 is connected to the P port oil circuit of the clamping reversing valve through the P port and the B port of the switching valve 5; the X port of the switching valve 5 is connected to the K port oil circuit of the two-position two-way hydraulic control reversing valve 10. The above system is set when the monorail crane is working in the lifting state, that is, it does not move, and lifts heavy objects such as hydraulic supports through the lifting beam. In the lifting state, the electromagnet Y02 of the switching valve 5 is energized, and the switching valve 5 works in the left position, that is, the working position. At this time, the auxiliary pump 13 inputs the pressure oil into the P port of the switching valve, flows through the A port and acts on the inlet of the lifting motor 6, thereby completing the lifting work. At the same time, it flows through the X port and acts on the K port of the clamping control valve 8, so that the two-position two-way hydraulically controlled reversing valve 10 is reversed and works in the right position. At this time, the pressure oil in the rod chamber of the clamping cylinder 7 cannot flow to the P port of the clamping control valve 8 through the A port of the clamping control valve 8. Therefore, the clamping cylinder 7 can still provide sufficient clamping force to press the drive motor 2 onto the track to prevent the locomotive from slipping when the brakes fail.

[0014] The system also includes a manual reversing valve 11, which is a two-position three-way reversing valve. The oil outlet of the auxiliary pump 13 enters the A port and the P port of the manual reversing valve 11 through the P port and the B port of the switching valve 5, and is connected to the P port oil circuit of the clamping control valve 8. When the monorail crane is not used for a long time, the manual reversing valve 11 can be operated to work in the left position. At this time, the pressure oil in the rod chamber of the clamping oil cylinder 7 flows through the A port and the P port of the clamping control valve 8 into the P port of the manual reversing valve 11 through the B port and into the oil tank, so that the clamping oil cylinder 7 is in a unloading state to extend its service life.

[0015] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Various changes that can be made within the knowledge scope of technicians in the relevant technical field without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A diesel engine monorail crane locomotive drive clamping automatic control system, characterized in that: The invention comprises a main pump (1), a driving motor (2), a pressure sensor (3), a controller (4), a clamping oil cylinder (7), a clamping control valve (8), and an auxiliary pump (13), wherein the main pump (1) is a bidirectional variable displacement pump, the driving motor (2) is a bidirectional fixed displacement motor, the main pump (1) and the driving motor (2) are connected in oil circuit, the A oil port of the main pump (1) is connected to the controller (4) through the pressure sensor (3), and the B oil port of the main pump (1) is connected to the controller (4) through the pressure sensor (3), the pressure sensor (3) is used to obtain the pressure values ​​of the A and B oil ports of the main pump (1), and convert the pressure values ​​into electrical signals and send them to the controller (4), the controller (4) calculates the pressure difference between the two, and outputs the corresponding The auxiliary pump (13) is connected to the P port oil circuit of the clamping control valve (8), and the A port of the clamping control valve (8) is connected to the rod chamber oil circuit of the clamping cylinder (7). The pressure oil of the auxiliary pump (13) enters the rod chamber of the clamping cylinder (7) through the clamping control valve (8), controls the extension and retraction of the clamping cylinder (7), and presses the driving wheel onto the track. The clamping control valve (8) comprises an electric proportional pressure reducing valve (9) and a two-position two-way hydraulically controlled reversing valve (10). The electric proportional pressure reducing valve (9) is connected to the left position oil circuit of the two-position two-way hydraulically controlled reversing valve (10). The controller (4) is electrically connected to the electric proportional pressure reducing valve (9), and controls the valve opening of the electric proportional pressure reducing valve (9) through the pressure difference electric signal.

2. According to claim 1, a diesel engine monorail crane locomotive drive clamping automatic control system is characterized in that: It also includes a switching valve (5) and a lifting motor (6), wherein the switching valve (5) is a two-position four-way electromagnetic reversing valve. In the working position, the oil outlet of the auxiliary pump (13) is connected to the oil circuit of the lifting motor (6) through the P port and the A port of the switching valve (5).

3. The diesel engine monorail crane locomotive drive clamping automatic control system according to claim 2 is characterized by: In the normal position of the switching valve (5), the oil outlet of the auxiliary pump (13) is connected to the oil circuit of the P port of the clamping control valve (8) through the P port and the B port of the switching valve (5); the X port of the switching valve (5) is connected to the oil circuit of the K port of the two-position two-way hydraulically controlled reversing valve (10).

4. The diesel engine monorail crane locomotive drive clamping automatic control system according to claim 3 is characterized by: It also includes a manual reversing valve (11), which is a two-position three-way reversing valve. The oil outlet of the auxiliary pump (13) passes through the P port and the B port of the switching valve (5) and enters the A port and the P port of the manual reversing valve (11) to communicate with the P port oil circuit of the clamping control valve (8).

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