A control system and method for loading and unloading a vehicle on a truck crane

Abstract

The present invention discloses a vehicle loading and receiving control system and a control method thereof for a vehicle crane. The vehicle loading and receiving control system for a vehicle crane comprises a torque limiter arranged in a vehicle loading and receiving control room, a total length angle sensor, a front area detection switch, a slewing centering switch and a load unloading solenoid valve respectively connected to the torque limiter; the total length angle sensor is installed on the basic arm of the telescopic arm; the front area detection switch is used to detect whether the loading equipment is slewed to the area directly in front of the driving direction of the vehicle crane; the slewing centering switch is fixed on the chassis of the crane and adjacent to the slewing mechanism, and the slewing centering switch collects the paddle signal on the slewing mechanism to determine whether the loading equipment is slewed and centered. The present invention automatically activates and manually starts the vehicle receiving mode according to the collected data of each sensor switch, and even if the amplitude value of the crane exceeds the alarm range value, the load unloading solenoid valve and the overload buzzer will not be started, thereby ensuring the normal loading and receiving of the vehicle crane.

Description

Technical Field

[0001] The invention relates to the field of automobile crane control systems, in particular to an automobile crane loading and unloading control system and a control method thereof. Background Art

[0002] When the truck crane completes the lifting task, it will be retracted. The process of retracting the truck is to fully retract the telescopic arm first, and then place the telescopic arm drop amplitude on the telescopic arm bracket. As the telescopic arm angle decreases, the amplitude value of the crane becomes larger and larger. For mainstream products on the market, the maximum amplitude value on the lifting weight performance table of a telescopic arm of about 10.5m when the arm is fully retracted does not exceed 9m. When the telescopic arm angle is reduced to 20-30°, it will trigger an overload alarm that exceeds the performance table. When continuing to drop the amplitude downward, the action of dropping the amplitude is restricted due to the operation of the unloading solenoid valve; the forced switch must be pressed, which is not convenient to operate. At the same time, the overload buzzer will also alarm at this time, and the harsh buzzer alarm has a great impact on the operator's senses. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a control system and a control method for loading and retracting a vehicle on a truck crane, and to start a retracting mode according to various collected data, thereby ensuring the safety of the loading and retracting operation of the truck crane.

[0004] The technical solution of the present invention is:

[0005] A vehicle crane upper load retracting control system comprises a torque limiter arranged in the upper load control room of the vehicle crane, a total length angle sensor, a front area detection switch, a slewing centering switch and an unloading solenoid valve respectively connected to the torque limiter; the total length angle sensor is installed on the basic arm of the telescopic arm and is used to detect the telescopic length and amplitude change angle of the telescopic arm; the front area detection switch is used to detect whether the upper load equipment is slewed to the area just in front of the driving direction of the vehicle crane; the slewing centering switch is fixed on the crane chassis and adjacent to the slewing mechanism, and a paddle is fixed on the slewing mechanism. When the slewing centering switch collects the paddle signal, it indicates that the upper load equipment is slewed and centered; the unloading solenoid valve is connected between the oil supply tank and the driving oil cylinder of the telescopic arm.

[0006] The front area detection switch is integrated on the central slewing slip ring of the slewing mechanism of the truck crane.

[0007] The rotary centering switch is a contact type trigger switch.

[0008] The total length angle sensor includes an integrated length sensor and an angle sensor. The length measuring line of the length sensor is fixed on the arm head of the telescopic arm. As the telescopic arm is extended or retracted, the length measuring line fixed on the arm head will rotate with the length sensor winding box to ensure real-time detection of the length of the entire telescopic arm.

[0009] The torque limiter comprises a controller and a touch display screen integrally connected to the controller; the total length angle sensor, the front area detection switch, the rotation centering switch, and the unloading solenoid valve are all connected to the controller.

[0010] The front area detection switch is used to detect whether the upper equipment is rotated to the area of ​​plus or minus 45 degrees in front of the driving direction of the truck crane.

[0011] A control method for a vehicle loading and unloading control system of a truck crane, specifically including the following control operations:

[0012] (1) During normal lifting operations of a truck crane, the torque limiter determines the lifting capacity performance of each instant working condition through the input data of the total length angle sensor and the front area detection switch, and controls whether the unloading solenoid valve is working to ensure the safety of the entire vehicle.

[0013] (2) When the torque limiter detects that the following four conditions are met at the same time, the virtual button for the vehicle closing mode hidden on the touch screen of the torque limiter is activated and becomes selectable;

[0014] a. The telescopic arm length sensor collects data when the telescopic arm is in the fully retracted state;

[0015] b. When the front area detection switch determines that the upper equipment rotates to the area directly in front of the driving direction of the truck crane;

[0016] c. The rotary centering switch is turned on;

[0017] d. The actual lifting weight is within two times the empty hook weight;

[0018] (3) When the virtual button of the vehicle retracting mode is not pressed, the entire vehicle crane is still in the normal lifting operation state, which is a safety control mode; when the virtual button of the vehicle retracting mode is pressed, the entire vehicle crane enters the vehicle retracting mode state, and the telescopic arm performs the luffing operation. At this time, the virtual button of the vehicle retracting mode on the touch screen appears to be prominently selected. At the same time, during the luffing process, even if the amplitude value of the crane exceeds the alarm range value of the performance table, the unloading solenoid valve and the overload buzzer will not be activated, making it more convenient to load and retract the vehicle on the vehicle crane and avoiding the influence of the unloading solenoid valve and the buzzer;

[0019] (4) When the torque limiter detects that the four conditions are not met at the same time, that is, when any one of the conditions is not met, the virtual button of the vehicle retracting mode will not be activated, and the telescopic arm lowering and luffing operation will be controlled by the unloading solenoid valve.

[0020] Advantages of the present invention:

[0021] The present invention determines whether the telescopic arm is in a fully retracted state according to the telescopic arm length sensor, determines whether the crane is in front of the slewing center by the front area detection switch and the slewing centering switch, and determines whether the current actual lifting weight detected by the torque limiter is only twice the weight of the empty hook (that is, it is in a non-loading state). When the above conditions are met, the vehicle retracting mode can be activated, and the operator confirms the vehicle retracting mode on the interface before performing the amplitude change operation. Even if the amplitude value of the crane exceeds the alarm range value, the unloading solenoid valve and the overload buzzer will not be started, thereby ensuring the normal loading and retracting of the truck crane, making it more convenient to load and retract the truck crane, and avoiding the influence of the unloading solenoid valve and the buzzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The invention discloses a structural block diagram of a vehicle loading and unloading control system for a vehicle crane.

[0023] Figure 2 It is a structural schematic diagram of the truck crane of the present invention.

[0024] Figure 3 yes Figure 2 Enlarged view of part A in . DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See Figure 1-Figure 3A vehicle crane upper loading and unloading control system includes a torque limiter 1, a total length angle sensor 2, a front area detection switch 3, a slewing centering switch 4 and a unloading solenoid valve 5 arranged in a vehicle crane upper loading control room 9; the torque limiter 1 includes a controller and a touch display screen integrated with the controller, and the total length angle sensor 2, the front area detection switch 3, the slewing centering switch 4 and the unloading solenoid valve 5 are all connected to the controller; the total length angle sensor 2 is installed on the basic arm of the telescopic arm 10, and is used to detect the telescopic length and amplitude change angle of the telescopic arm 10, and includes a length sensor and an angle sensor, and the length measuring line of the length sensor Fixed on the arm head of the telescopic arm; the front area detection switch 3 is integrated on the central slewing slip ring 8 of the slewing mechanism 7 of the truck crane. When the central slewing slip ring 8 is powered off, it means that the upper equipment rotates to the area of ​​plus or minus 45 degrees in front of the driving direction of the truck crane; the slewing centering switch 4 is a contact trigger switch, which is fixed on the crane chassis 6 and adjacent to the slewing mechanism 7. A paddle 11 is fixed on the slewing mechanism 7. When the slewing centering switch 4 contacts the paddle 11, the upper equipment slewing centering signal is sent to the torque limiter 1; the unloading solenoid valve 5 is connected between the oil supply tank and the driving cylinder of the telescopic arm to interrupt the extension and drop action of the telescopic arm.

[0027] Working principle of the present invention:

[0028] (1) During the normal lifting operation of the truck crane, the torque limiter 1 determines the lifting capacity performance of each instant working condition through the input data of the total length angle sensor 2 and the front area detection switch 3, and controls whether the unloading solenoid valve is working to ensure the safety of the entire vehicle.

[0029] (2) When the torque limiter 1 detects that the following four conditions are met at the same time, the virtual button of the vehicle closing mode hidden on the touch screen of the torque limiter 1 is activated and becomes selectable;

[0030] a. Telescopic arm length sensor 2 collects data when the telescopic arm is in a fully retracted state;

[0031] b. When the front area detection switch 3 determines that the upper equipment rotates to the area directly in front of the driving direction of the truck crane;

[0032] c. Turn on the rotary centering switch 4;

[0033] d. The actual lifting weight is within two times the empty hook weight;

[0034] (3) When the virtual button of the vehicle retracting mode is not pressed, the entire vehicle crane is still in the normal lifting operation state, which is the safety control mode; when the virtual button of the vehicle retracting mode is pressed, the entire vehicle crane enters the vehicle retracting mode state, and the telescopic arm 10 performs the luffing operation. At this time, the virtual button of the vehicle retracting mode on the touch screen is prominently selected. At the same time, during the luffing process, even if the amplitude value of the crane exceeds the alarm range value of the performance table (the angle is reduced to 20°-30°), the unloading solenoid valve 7 and the overload buzzer will not be started, making it more convenient to load and retract the vehicle on the vehicle crane and avoiding the influence of the unloading solenoid valve and the buzzer;

[0035] (4) When the torque limiter 1 detects that the four conditions are not met at the same time, that is, when any one of the conditions is not met, for example, when the upper part of the truck crane rotates beyond a certain angle, the virtual button of the retracting mode will not be activated, and the luffing operation of the telescopic arm 10 will be controlled by the unloading solenoid valve.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for a vehicle loading and unloading control system of a vehicle crane, characterized in that: The upper load vehicle collection control system includes a torque limiter arranged in the upper load control room of the automobile crane, a total length angle sensor, a front area detection switch, a slewing centering switch and an unloading solenoid valve respectively connected to the torque limiter; the total length angle sensor is installed on the basic arm of the telescopic arm, and is used to detect the telescopic length and amplitude change angle of the telescopic arm; the front area detection switch is used to detect whether the upper load equipment is slewed to the area directly in front of the driving direction of the automobile crane; the slewing centering switch is fixed on the chassis of the crane and adjacent to the slewing mechanism, and a paddle is fixed on the slewing mechanism. When the slewing centering switch collects the paddle signal, it indicates that the upper load equipment is slewed and centered; the unloading solenoid valve is connected between the oil supply tank and the driving oil cylinder of the telescopic arm; The control method specifically includes the following control operations: (1) During the normal lifting operation of the truck crane, the torque limiter determines the lifting capacity performance of each instant working condition through the input data of the total length angle sensor and the front area detection switch, and controls whether the unloading solenoid valve works to ensure the safety of the vehicle; (2) When the torque limiter detects that the following four conditions are met at the same time, the virtual button for the retracting mode hidden on the touch screen of the torque limiter is activated and becomes selectable; a. The telescopic arm length sensor collects data when the telescopic arm is in the fully retracted state; b. When the front area detection switch determines that the upper equipment rotates to the area directly in front of the driving direction of the truck crane; c. The rotary centering switch is turned on; d. The actual lifting weight is within two times the empty hook weight; (3) When the virtual button of the vehicle retracting mode is not pressed, the whole truck crane is still in the normal lifting operation state, which is the safety control mode; when the virtual button of the vehicle retracting mode is pressed, the whole truck crane enters the vehicle retracting mode state, and the telescopic arm performs the luffing operation. At this time, the virtual button of the vehicle retracting mode on the touch screen appears to be selected. At the same time, during the luffing process, even if the amplitude value of the crane exceeds the alarm range value of the performance table, the unloading solenoid valve and overload buzzer will not be activated, making it more convenient to load and retract the truck crane and avoiding the influence of the unloading solenoid valve and buzzer; (4) When the torque limiter detects that the four conditions are not met at the same time, that is, when any one of the conditions is not met, the virtual button of the vehicle retracting mode will not be activated, and the telescopic arm lowering and luffing operation will be controlled by the unloading solenoid valve.

2. The control method according to claim 1, characterized in that: The front area detection switch is integrated on the central slewing slip ring of the slewing mechanism of the truck crane.

3. The control method according to claim 1, characterized in that: The rotary centering switch is a contact type trigger switch.

4. The control method according to claim 1, characterized in that: The total length angle sensor includes an integrated length sensor and an angle sensor. The length measuring line of the length sensor is fixed on the arm head of the telescopic arm. As the telescopic arm is extended or retracted, the length measuring line fixed on the arm head will rotate with the length sensor winding box to ensure real-time detection of the length of the entire telescopic arm.

5. The control method according to claim 1, characterized in that: The torque limiter comprises a controller and a touch display screen integrally connected to the controller; the total length angle sensor, the front area detection switch, the rotation centering switch, and the unloading solenoid valve are all connected to the controller.

6. The control method according to claim 2, characterized in that: The front area detection switch is used to detect whether the upper equipment is rotated to the area of ​​plus or minus 45 degrees in front of the driving direction of the truck crane.

Images