Hydraulic system and control method of whole vehicle assembly and transportation device for port machinery

Abstract

The application provides a hydraulic system and control method of a whole vehicle assembly and transportation device for port machinery, comprising a driving motor, a hydraulic oil pump, a hydraulic oil tank, an unloading valve, a lifting and moving control valve group, a lifting oil cylinder, a lifting position sensor, a horizontal moving oil cylinder and a horizontal moving position sensor. The lifting and moving control valve group is composed of a selection valve, a lifting control valve and a moving control valve. The lifting position sensor and the horizontal moving position sensor are installed at one end of a fixed part and one end of a moving part, and output position signals in real time with the movement of the lifting oil cylinder / horizontal moving oil cylinder. The lifting and horizontal moving functions of the support part in the whole machine assembly and transportation device are realized, the product can be applied to different axle distance frames, the applicability is improved, and the production line utilization rate is improved. The lifting and moving control valve group adopts parallel oil inlet selection switching, and can realize separate actions of lifting and horizontal moving, eliminates collision and interference during simultaneous work, and improves safety.

Description

Technical Field

[0001] This invention patent relates to the field of port machinery, and in particular to a hydraulic system and control method for a complete vehicle assembly and transportation device for port machinery. Background Technology

[0002] Attractive cranes (reach lifts) are key equipment for container transshipment in ports, characterized by flexible gripping, high stacking capacity, and stable operation. The entire crane comprises an undercarriage traveling section and an upper-carriage working section, involving structural, power, steering, braking, hydraulic, and electrical control components, making assembly complex. To improve the assembly efficiency of reach lifts, a reach lift production line is designed with multiple workstations. A complete crane assembly and transport device transports reach lifts in different states to their respective workstations for assembly, creating a streamlined process, reducing assembly cycle time, and increasing production capacity. The two fixed supports of the reach lift assembly and transport device are connected to the reach lift frame. The lifting and lowering of these supports control the transport and assembly states of the reach lift. However, because the front and rear positions of the two fixed supports are fixed, this method can only be used for online assembly of reach lift products, limiting its applicability and flexibility. When demand for reach lifts is low, the overall production line utilization rate is low.

[0003] Currently, the lifting section of the transport device in the front-end crane assembly line generally uses support devices with fixed front and rear positions. That is, the positions of the front and rear supports are arranged according to the wheelbase of the front-end crane frame, and the lifting and lowering actions are achieved through lifting cylinders.

[0004] The current installation and control method for reach stackers is as follows: First, the reach stacker is placed on the vehicle assembly and transport device. The vehicle frame is connected to the front and rear supports of the transport device. By controlling the lifting and lowering actions of the lifting cylinders of the transport device, the reach stacker is in both transport and assembly states. By controlling the movement of the lifting cylinders, the reach stacker moves upward and leaves the ground. The transport device then moves the reach stacker to the next workstation. Once it reaches the corresponding workstation, the lifting cylinders are lowered, and the reach stacker descends until it lands on the ground, where the assembly work can begin.

[0005] The support device for the whole machine assembly and transportation device adopts a fixed front and rear position device, and the length of the support component is fixed and single; it can only be applied to the online assembly of front-end crane products, which is not very applicable and flexible. When the demand for front-end cranes is not high, the overall utilization rate of the production line is low. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydraulic system and control method for a port machinery vehicle assembly and transportation device. This system can adjust and control the front and rear distance of two support devices and accurately position them through length sensors, which can meet the needs of different product models. At the same time, it can ensure the safety of lifting and moving through program control.

[0007] To address the problems of existing technologies, this invention discloses a hydraulic system for a vehicle assembly and transportation device for port machinery, comprising a drive motor, a hydraulic oil pump, a hydraulic oil tank, an unloading valve, a lifting and movement control valve group, a lifting cylinder, a lifting position sensor, a horizontal movement cylinder, and a horizontal movement position sensor. The hydraulic oil pump is connected to both the drive motor and the hydraulic oil tank. The hydraulic oil pump is connected to the lifting and movement control valve group via the unloading valve. The lifting cylinder and the horizontal movement cylinder are also connected to the lifting and movement control valve group. At least one of the two support devices of the vehicle assembly and transportation device is capable of horizontal movement. The horizontal movement cylinder controls the horizontal movement of the support device and adjusts the distance between the two support devices. The horizontal movement position sensor detects the horizontal displacement of the support device. The lifting cylinder controls the two support devices to perform lifting actions, and the lifting position sensor detects the lifting position of the support devices.

[0008] Furthermore, the lifting and moving control valve assembly includes: a selector valve, a lifting control valve, and a moving control valve; the lifting control valve is connected to the lifting cylinder, the moving control valve is connected to the horizontal moving cylinder, and the selector valve is connected to both the lifting control valve and the moving control valve, respectively, and the selector valve is used to switch the oil circuits of the lifting control valve and the moving control valve.

[0009] Furthermore, the lifting control valve is equipped with a proportional solenoid valve Y2 and a proportional solenoid valve Y3; when the drive motor starts, the unloading valve is energized and the proportional solenoid valve Y3 is energized, and the hydraulic system builds pressure to extend the lifting cylinder, thereby realizing the lifting action of the two support devices; when the drive motor starts, the unloading valve is energized and the proportional solenoid valve Y2 is energized, and the hydraulic system builds pressure to retract the lifting cylinder, thereby realizing the lowering action of the two support devices.

[0010] Furthermore, the movement control valve is equipped with a proportional solenoid valve Y4 and a proportional solenoid valve Y5; when the drive motor starts, the unloading valve is energized, the selector valve is energized, and the proportional solenoid valve Y5 is energized, the hydraulic system builds pressure to extend the horizontal movement cylinder, realizing the forward movement of the support device; when the drive motor starts, the unloading valve is energized, the selector valve is energized, and the proportional solenoid valve Y4 is energized, the hydraulic system builds pressure to retract the horizontal movement cylinder, realizing the backward movement of the support device.

[0011] Accordingly, the control method for the hydraulic system of the aforementioned port machinery vehicle assembly and transportation device:

[0012] The system monitors the displacement parameters of the lifting position sensor in real time. When the forward or backward movement button is pressed, if the lifting position sensor outputs displacement S101, the electrical control system outputs an effective value; otherwise, the control system outputs no value and the drive motor stops. The system also monitors the displacement parameters of the horizontal movement position sensor in real time. When the lifting or lowering action button is pressed, if the horizontal movement position sensor outputs displacement S201, the electrical control system outputs an effective value; otherwise, the control system outputs no value and the drive motor stops.

[0013] Furthermore, it also includes: when the forward / backward and lift / lower buttons are accidentally operated simultaneously, the system will automatically control no output and issue an alarm.

[0014] The beneficial effects of this invention are as follows:

[0015] (1) The proposed hydraulic system and control method for a port product vehicle assembly and transportation device realizes the lifting and horizontal movement functions of the support part in the vehicle assembly and transportation device. It can be applied to products with different wheelbase frames, improves applicability, and increases production line utilization.

[0016] (2) The proposed lifting and moving control valve group for a port product vehicle assembly and transportation device adopts parallel oil inlet selection and switching, which can realize the separate actions of lifting and horizontal movement, eliminate collisions and interferences when working simultaneously, and improve safety.

[0017] (3) The proposed hydraulic system and control method for a port product vehicle assembly and transportation device adopts a single selection of hydraulic system and automatic identification control of electrical system to improve the reliability and safety of the system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hydraulic system of the port machinery vehicle assembly and transportation device of the present invention;

[0019] Figure 2 This is a schematic diagram of the lifting and moving control valve assembly in this invention;

[0020] Figure 3 This is a schematic diagram of the hydraulic system control logic of the port machinery vehicle assembly and transportation device of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0022] like Figure 1As shown, a hydraulic system for a port machinery vehicle assembly and transportation device according to the present invention includes a drive motor 1, a hydraulic oil pump 2, a hydraulic oil tank 3, an unloading valve 4, a lifting and movement control valve group 5, a lifting cylinder 6, a lifting position sensor 7, a horizontal movement cylinder 8, and a horizontal movement position sensor 9. The hydraulic oil pump 2 is connected to both the drive motor 1 and the hydraulic oil tank 3. The hydraulic oil pump 2 is connected to the lifting and movement control valve group 5 via the unloading valve 4. The lifting cylinder 6 and the horizontal movement cylinder 8 are also connected to the lifting and movement control valve group 5. At least one of the two support devices of the vehicle assembly and transportation device is capable of horizontal movement. The horizontal movement cylinder 8 controls the horizontal movement of the support device and adjusts the distance between the two support devices. The horizontal movement position sensor 9 detects the horizontal displacement of the support device. The lifting cylinder 6 controls the two support devices to perform lifting actions, and the lifting position sensor 7 detects the lifting position of the support devices. Preferably, one end of the lifting position sensor 7 and the horizontal movement position sensor 9 are installed on a fixed part, and the other end is installed on a moving part, outputting position signals in real time as the lifting cylinder / horizontal movement cylinder moves.

[0023] like Figure 2 As shown, the lifting and moving control valve group 5 adopts parallel oil inlet selection and switching, including: selection valve 501, lifting control valve 502 and moving control valve 503; the lifting control valve 502 is connected to the lifting cylinder 6, the moving control valve 503 is connected to the horizontal moving cylinder 8, the selection valve 501 is connected to the lifting control valve 502 and the moving control valve 503 respectively, and the selection valve 501 is used to switch the oil circuit of the lifting control valve 502 and the moving control valve 503.

[0024] The hydraulic system of the port machinery vehicle assembly and transportation device of the present invention is used as follows:

[0025] Lifting action of the support part in the whole machine assembly and transportation device: By operating the lifting action button, the system control drive motor 1 starts, the unloading valve 4 is energized, the proportional solenoid valve Y3 in the lifting control valve 502 is energized, the hydraulic system builds pressure to extend the lifting cylinder 6, and realizes the lifting action.

[0026] The lowering action of the support part in the whole machine assembly and transportation device: by operating the lowering action button, the system control drive motor 1 starts, the unloading valve 4 is energized, the proportional solenoid valve Y2 in the lifting control valve 502 is energized, the hydraulic system builds pressure to retract the lifting cylinder 6, and realizes the lowering action.

[0027] The forward movement of the support part in the assembly and transportation device of the whole machine: by operating the forward movement button, the system control drive motor 1 starts, the unloading valve 4 is energized, the selector valve 501 is energized, the proportional solenoid valve Y5 in the movement control valve 503 is energized, the hydraulic system builds pressure to extend the horizontal movement cylinder 8, and realizes the forward movement.

[0028] The rearward movement of the support part in the assembly and transportation device of the whole machine: by operating the rearward movement button, the system control drive motor 1 starts, the unloading valve 4 is energized, the selector valve 501 is energized, the proportional solenoid valve Y4 in the movement control valve 503 is energized, the hydraulic system builds pressure to retract the horizontal movement cylinder 8, and realizes the rearward movement.

[0029] like Figure 3 As shown, the control method of the hydraulic system of the port machinery vehicle assembly and transportation device of the present invention: the control system detects the displacement S1 in the height direction and the displacement S2 in the horizontal direction of the supporting part in the vehicle assembly and transportation device through the lifting position sensor 7 and the horizontal movement position sensor 9, wherein the displacement S101 in the height direction indicates the lowest position, and the displacement S201 in the horizontal direction indicates the position required by product A.

[0030] The forward / backward movement of the support part in the whole machine assembly and transportation device is effective: the control system detects the displacement parameter of the lifting position sensor 7 in real time. When the forward or backward movement button is pressed, the control system detects that the output of the lifting position sensor 7 is displacement S101, and the electrical control system output is effective. Otherwise, the control system has no output and the drive motor stops.

[0031] The lifting / lowering action of the support part in the whole machine assembly and transportation device is effective: the control system detects the displacement parameter of the horizontal movement position sensor 9 in real time. When the lifting or lowering action button is operated, the control system detects that the horizontal movement position sensor 9 outputs displacement S201, and the electrical control system output is effective. Otherwise, the control system has no output and the drive motor stops.

[0032] If the forward / backward and lift / lower buttons are accidentally pressed simultaneously, the system will automatically stop output and issue an alarm.

[0033] The hydraulic system of the port machinery vehicle assembly and transportation device of the present invention solves the problem of fixed front and rear positions of the support device in the vehicle transportation device, improves adaptability and flexibility, increases production line utilization, and improves system safety by adopting a parallel selection hydraulic system and electrical control strategy.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the accompanying drawings of this invention, the fill patterns are only for distinguishing layers and do not constitute any other limitation.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic system for a port machinery assembly and transportation device, characterized in that, The system includes a drive motor (1), a hydraulic pump (2), a hydraulic tank (3), an unloading valve (4), a lifting and moving control valve group (5), a lifting cylinder (6), a lifting position sensor (7), a horizontal moving cylinder (8), and a horizontal moving position sensor (9). The hydraulic pump (2) is connected to the drive motor (1) and the hydraulic tank (3) respectively. The hydraulic pump (2) is connected to the lifting and moving control valve group (5) through the unloading valve (4). The lifting cylinder (6) and the horizontal moving cylinder (8) are connected to the lifting and moving control valve group (5) respectively. At least one of the two support devices of the vehicle assembly and transportation device can move horizontally. The horizontal moving cylinder (8) is used to control the horizontal movement of the support device and adjust the distance between the two support devices. The horizontal moving position sensor (9) is used to detect the horizontal displacement of the support device. The lifting cylinder (6) controls the two support devices to perform lifting actions. The lifting position sensor (7) is used to detect the lifting position of the support device. The lifting and moving control valve assembly (5) includes: a selector valve (501), a lifting control valve (502), and a moving control valve (503); the lifting control valve (502) is connected to the lifting cylinder (6), the moving control valve (503) is connected to the horizontal moving cylinder (8), the selector valve (501) is connected to the lifting control valve (502) and the moving control valve (503) respectively, and the selector valve (501) is used to switch the oil circuits of the lifting control valve (502) and the moving control valve (503); The displacement parameters of the lifting position sensor (7) are detected in real time. When the forward or backward movement operation button is pressed, the control system detects that the output of the lifting position sensor (7) is displacement S101. When this is detected, the electrical control system output is valid. Otherwise, the control system has no output and the drive motor (1) stops. The displacement parameters of the horizontal position sensor (9) are detected in real time. When the lifting or lowering action button is operated, the control system detects that the output of the horizontal position sensor (9) is displacement S201. When this is detected, the electrical control system output is valid. Otherwise, the control system has no output and the drive motor (1) stops. If the forward / backward and lift / lower buttons are accidentally pressed simultaneously, the system will automatically stop output and issue an alarm.

2. The hydraulic system of the port machinery vehicle assembly and transportation device according to claim 1, characterized in that, The lifting control valve (502) is equipped with a proportional solenoid valve Y2 and a proportional solenoid valve Y3. When the drive motor (1) is started, the unloading valve (4) is energized and the proportional solenoid valve Y3 is energized. The hydraulic system builds pressure to extend the lifting cylinder (6) and realize the lifting action of the two support devices. When the drive motor (1) is started, the unloading valve (4) is energized and the proportional solenoid valve Y2 is energized. The hydraulic system builds pressure to retract the lifting cylinder (6) and realize the lowering action of the two support devices.

3. The hydraulic system of the port machinery vehicle assembly and transportation device according to claim 1, characterized in that, The movement control valve (503) is equipped with a proportional solenoid valve Y4 and a proportional solenoid valve Y5. When the drive motor (1) is started, the unloading valve (4) is energized, the selector valve (501) is energized, and the proportional solenoid valve Y5 is energized. The hydraulic system builds pressure to extend the horizontal movement cylinder (8) and realize the forward movement of the support device. When the drive motor (1) is started, the unloading valve (4) is energized, the selector valve (501) is energized, and the proportional solenoid valve Y4 is energized. The hydraulic system builds pressure to retract the horizontal movement cylinder (8) and realize the backward movement of the support device.

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