CN102804980B - Automatic monitoring and trouble-shooting device for blocking fault of cylinder-type threshing parts - Google Patents

Abstract

The invention relates to an automatic monitoring and trouble-shooting device for a blocking fault of cylinder-type threshing parts and belongs to the technical field of agricultural machinery. The device comprises a threshing cylinder, a threshing concave board and a control circuit, wherein the threshing concave board consists of a fixing concave board and a moving concave board; one end, which is far away from the fixing concave board, of the moving concave board is connected with a piston rod of a hydraulic cylinder by a pressure sensor, and a cylinder body of the hydraulic cylinder is hinged on a machine frame; a pressure signal output end of the sensor is connected with a hydraulic cylinder oil circuit reversing valve by the CPU-included control circuit; when pressure signal value is smaller than preset lower limit value, the reversing valve is controlled to keep a preset gap between the moving concave board and a threshing cylinder by the hydraulic cylinder; and when the pressure signal value is greater than a preset upper limit value, the reversing valve is controlled to increase the gap between the moving concave board and the threshing cylinder by the hydraulic cylinder. By adoption of the device, not only the blocking fault is effectively avoided, but also blockages can be removed.

Description

Automatic monitoring and removal device for clogging faults of drum threshing components

technical field

The invention relates to a combine harvester threshing device, in particular to a drum type threshing component clogging fault automatic monitoring and eliminating device, which belongs to the technical field of agricultural machinery.

Background technique

When harvesting a full-feed combine harvester, crop stalks often jam in the harvester's intermediate conveyor and threshing unit, causing interruptions in work and even damage to components. It is time-consuming and labor-intensive to eliminate the blocking fault and repair the machine tool, which not only reduces the operating efficiency of the machine tool, but also delays the harvesting time and causes economic losses. Blockage failures are usually caused by excessive cutting feed, tough crop stems and/or high humidity. Blockage first occurs in the threshing device, especially at the outlet of the drum threshing unit.

The invention patent application with the application number 200910032561.9 "Combine Harvester Blockage Fault Warning and Alarm Device" discloses a kind of early warning and alarm device that can be installed on the harvester to prevent the occurrence of blockage faults. The device consists of a speed sensor, signal processing, It is composed of unit modules such as single-chip central information processing and information display. When the harvester is working, it can give real-time blockage warning and alarm to the threshing drum and grain conveying auger parts. Although this device can provide sound and image warning information for blocking faults, it cannot effectively prevent the occurrence of blocking faults. Reducing the cutting feed in time will also lag behind the reaction to the material entering the drum threshing unit. In addition, there is also the possibility that the warning signal is not detected or the operating status of the machine cannot be adjusted correctly in time.

Contents of the invention

The object of the present invention is to propose an automatic fault monitoring and elimination device that can effectively prevent the clogging fault of the drum threshing part of the full-feeding combined machine in view of the problems existing in the above-mentioned prior art.

In order to achieve the stated purpose, the basic technical scheme of the automatic monitoring and troubleshooting device for drum-type threshing component blockage faults of the present invention is as follows: it includes a threshing drum supported on the frame, an arc-shaped threshing concave plate located on the periphery of the threshing drum, and a control circuit containing a CPU. , the improvement is that: the threshing concave plate is composed of a fixed concave plate on the feed side and a movable concave plate on the discharge side and hinged with the fixed concave plate; the movable concave plate is far away from the fixed concave plate. One end is connected to the piston rod of the hydraulic cylinder through a pressure sensor, and the cylinder body of the hydraulic cylinder is hinged on the frame; the pressure signal output end of the pressure sensor is connected to the oil circuit of the hydraulic cylinder through a control circuit containing a CPU. valve; the alarm output terminal of the control circuit is connected to a warning device; when the pressure signal is less than a predetermined lower limit, the reversing valve is controlled to be in a position where the predetermined gap between the movable concave plate and the threshing cylinder is maintained by the hydraulic cylinder ; When the pressure signal is greater than the predetermined upper limit, the reversing valve is controlled to be in a position where the gap between the movable concave plate and the threshing cylinder is enlarged through the hydraulic cylinder.

Therefore, when a large amount of crops enter the threshing drum, the pressure on the movable concave plate increases. After the signal generated by the pressure sensor is judged and processed by the CPU, the output controls the reversing valve, and then the hydraulic cylinder increases the pressure of the movable concave plate and the threshing drum. The gap can effectively avoid the occurrence of blocking faults, and can send out warning signals to remind the operator in due course.

A further perfection of the present invention is that the threshing drum is equipped with a speed sensor, and the output end of the speed signal of the speed sensor is connected to the corresponding input end of the control circuit; when the speed signal is less than a predetermined value, the hydraulic cylinder is The control is at the position where the movable concave plate and the threshing cylinder reach the maximum gap.

Since the blockage usually occurs near the discharge port, once the threshing drum speed slows down due to the tendency of blockage, the movable concave plate will be as far away from the threshing drum as possible, and the closer to the discharge port, the larger the gap will be, and the alarm will prompt the operator at the same time. This automatically eliminates the tendency to clog and further ensures smooth threshing. In fact, due to abnormal factors such as unevenness of crops in the field, the back pressure of the concave plate further increases, and the rotating speed of the drum decreases rapidly. Drain.

To sum up, in general, as the amount of crops fed to the threshing drum increases, the threshing load increases, the back pressure of the concave plate increases, and the speed of the threshing drum decreases. When the back pressure of the concave plate increases to a certain value, the speed of the threshing drum decreases. When it reaches a certain value, the control circuit will output the command to control the reversing valve after judging and processing the comprehensive pressure and speed sensor signals, and then increase the gap between the movable concave plate and the threshing drum to effectively avoid blocking failures, that is, to achieve anti-blocking. Due to the influence of abnormal factors such as the unevenness of field crops, the back pressure of the concave plate further increases, and the rotating speed of the drum decreases rapidly. That is to say, the blocking is realized.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 .

Detailed ways

Embodiment one

The drum-type threshing component clogging fault automatic monitoring and eliminating device of the present embodiment is shown in Figure 1 and Figure 2, comprises the threshing cylinder 3 supported on the frame, the arc-shaped threshing concave plate positioned at the periphery of the threshing cylinder and the control system containing CPU. Circuit (for details of the circuit, refer to prior art such as 200910032561.9). Among them, the threshing concave plate is composed of a fixed concave plate 1 fixed by bolts 2 on the feeding side and a movable concave plate 5 on the discharging side, and the joints of the fixed concave plate 1 and the movable concave plate 5 extend radially outward respectively. Out of the hinged block of pairing, two hinged blocks of pairing are hinged by bearing pin 4. One end of the movable concave plate 5 away from the fixed concave plate 1 is connected with the piston rod of the hydraulic cylinder 6 by the hinged connecting ear 8 through the pressure sensor 7, and the cylinder body of the hydraulic cylinder 6 is hinged on the frame. The pressure signal output end of the pressure sensor 7 is connected to the oil circuit reversing valve of the hydraulic cylinder 6 through the control circuit (this embodiment adopts a two-position four-way electromagnetic control valve). When the CPU judges that the pressure signal is less than the predetermined lower limit value, it sends out a control signal, so that the reversing valve is controlled to maintain the predetermined gap position between the movable concave plate and the threshing cylinder through the hydraulic cylinder (normally, the gap between the concave plate and the threshing cylinder is relatively fixed, Thus corresponding to the appropriate feeding amount, the ideal threshing effect is achieved; when the CPU judges that the pressure signal is greater than the predetermined upper limit, a corresponding control signal is sent, so that the reversing valve is controlled to increase the movable concave plate and the threshing through the hydraulic cylinder. Cylinder gap position. And, threshing drum 3 is equipped with speed sensor, and the speed signal output terminal of this speed sensor is connected to the corresponding input end of control circuit; The alarm output terminal of control circuit is connected warning device. When CPU judges that speed signal is less than predetermined value, A control signal is sent out so that the hydraulic cylinder is controlled to be at the position where the movable concave plate and the threshing drum reach the maximum gap.

When working, if too many crops enter the threshing drum, the pressure on the movable concave plate will increase. After the signal generated by the pressure sensor is judged and processed by the CPU of the control circuit, the reversing solenoid valve of the hydraulic cylinder will be controlled to increase the size of the movable concave plate. The gap with the threshing drum - that is, to increase the space of the crop discharge channel, so as to automatically respond and realize anti-blocking. Subsequently, when the pressure signal decreases to a predetermined lower limit, the CPU will control the hydraulic cylinder to reset through the reversing valve, and keep the movable concave plate and the threshing cylinder in a normal predetermined gap state. If there is too much quantity entering the threshing drum, there will be a blocking tendency, and the speed of the threshing drum will gradually decrease to the threshold value with the increase of load, the CPU of the control circuit will control the hydraulic cylinder to make the movable concave plate and the threshing drum reach the maximum gap, forming a horn mouth to realize unblocking. Moreover, the warning device can send out early warning signals of blockage faults in due course according to the preset setting——the alarm light on the liquid crystal display control panel is on, the buzzer on the control panel sounds an alarm, etc., to remind the operator to make corresponding responses. In a word, after adopting the device of this embodiment on the full-feeding combine harvester, it can effectively prevent the clogging failure of the drum threshing parts, thereby greatly reducing the probability of clogging failure of the intermediate conveying device, improving the operating efficiency of the machine tool, and ensuring timely harvesting of crops. Improve work efficiency.

Claims (4)

1. a drum-type threshing unit obstruction fault monitors remover automatically, comprise the threshing cylinder be supported in frame, be positioned at the circular arc threshing concave plate of threshing cylinder periphery and containing the control circuit of CPU, it is characterized in that: described threshing concave plate is by being positioned at the fixing notch board of charging side and being positioned at discharging side and the movable notch board hinged with fixing notch board forms; Described movable notch board is connected with the piston rod of hydraulic cylinder by pressure sensor away from one end of fixing notch board, and the cylinder body of described hydraulic cylinder is hinged in frame; The signal output end of described pressure sensor connects described hydraulic cylinder oil circuit reversal valve by the control circuit containing CPU; The warning output of described control circuit is received a crime report showing device; When described pressure signal is less than predetermined lower bound value, described reversal valve is controlled is in the position being kept described movable notch board and threshing cylinder predetermined gap by hydraulic cylinder; When described pressure signal is greater than predetermined upper limit value, described reversal valve is controlled is in the position being strengthened described movable notch board and threshing cylinder gap by hydraulic cylinder.

2. drum-type threshing unit obstruction fault according to claim 1 monitors remover automatically, and it is characterized in that: described threshing cylinder is equipped with speed probe, the tach signal of described speed probe exports the corresponding input of control circuit described in termination; When described tach signal is less than predetermined value, described hydraulic cylinder is controlled is in the position making movable notch board and threshing cylinder reach maximal clearance.

3. drum-type threshing unit obstruction fault according to claim 2 monitors remover automatically, it is characterized in that: described fixing notch board and movable notch board joint radially extend involutory hinged block respectively, and described involutory hinged block passes through hinge.

4. drum-type threshing unit obstruction fault according to claim 3 monitors remover automatically, it is characterized in that: described movable notch board is connected with the piston rod of hydraulic cylinder by pressure sensor by hinged engaging lug away from one end of fixing notch board.