CN209022755U - Combine Harvester Full Hydraulic Travel Drive - Google Patents

Abstract

The utility model discloses a fully hydraulic walking driving device for a combine harvester, which comprises an engine, a first variable motor and a second variable motor. The engine is connected with a main variable pump. The main variable pump is provided with two ports, one of which passes through The shunt drive valve group is respectively connected with one end of the first variable motor and the second variable motor, the other ends of the first variable motor and the second variable motor are connected with the other port of the main variable pump, and the main variable pump is connected with the pump variable mechanism, Both the first variable motor and the second variable motor are connected to the motor variable mechanism. The fully hydraulic walking driving device of the combine harvester of the utility model adopts an electronically controlled proportional variable pump and two two-speed variable motors to realize the forward and backward movement of the machine, the switching of the transition speed and the working speed, and the stepless speed change in the whole process; the turning is realized. Differential speed and anti-skid function; solve the problem of safe starting of the control handle in the middle position and the blocking of parking and walking.

Description

Combine Harvester Full Hydraulic Travel Drive

technical field

The utility model relates to a full hydraulic traveling driving device of a combine harvester, which belongs to the field of agricultural machinery.

Background technique

The existing combine harvester chassis in China is divided into two types: crawler type and wheel type. Crawler harvesters generally use hydrostatic stepless transmission and gear gearbox to realize stepless speed change, and realize a wide range of speed adjustment through mechanical shifting; wheeled combine harvesters mostly use mechanical walking system, which realizes speed regulation through mechanical shifting. , the operation is cumbersome and the infinitely variable speed cannot be realized. In recent years, the hydraulic walking drive of wheeled combine harvesters has also attracted more and more attention. Generally, the configuration of variable pump and quantitative motor is adopted, but there are not many mature products on the market.

Utility model content

Purpose of the utility model: In order to overcome the problems of complicated operation of the existing wheel harvester mechanical walking system and low field transition efficiency, the utility model provides a fully hydraulic walking driving device for a combine harvester, which is driven by an electronically controlled proportional variable pump and Two two-speed variable motors realize the forward, backward, switching speed and working speed of the machine, and the whole process is infinitely variable.

Technical solution: In order to solve the above technical problems, the fully hydraulic walking driving device of the combine harvester of the present invention includes an engine, a first variable motor and a second variable motor, the engine is connected with the main variable pump, and the main variable pump is provided with two One port is connected to one end of the first variable motor and the second variable motor respectively through the shunt drive valve group, and the other end of the first variable motor and the second variable motor is connected to the other port of the main variable pump, the main variable pump Connected to the pump variable mechanism, the first variable motor and the second variable motor are both connected to the motor variable mechanism.

Preferably, an oil change circuit valve block is connected in parallel with the first variable displacement motor and the second variable displacement motor.

Preferably, the diverting drive valve group is connected to a diverting valve controller.

Preferably, the main variable displacement pump is connected to the charge pump.

Preferably, the charge pump is connected to a relief valve, the relief valves are respectively connected to a pair of anti-shock valve groups, and the other end of the anti-shock valve group is connected to the port of the main variable pump.

Preferably, the engine starting circuit is connected to a safety starting device, the safety starting device includes a key switch, a speed control handle micro switch and a relay connected in series, and a relay normally open is connected in parallel to the speed control handle micro switch Contact, when the key switch and the micro switch of the speed control handle are closed, the relay is turned on, and the normally open contact is closed. At this time, the engine starts normally, and the power supply of the whole machine is not affected by the opening and closing of the micro switch of the speed control handle during the walking process. influences.

Preferably, the main variable pump is an electro-hydraulic proportional variable pump, the control signal input circuit of the electro-hydraulic proportional variable pump is connected in series with a safety walking device, the safety walking device includes a handle start switch, and the handle start switch is connected to the two branches, One branch is provided with a relay normally closed contact and a warning light in series, the other branch is provided with a handbrake microswitch and a relay connected in series, and the handbrake microswitch is connected in parallel with a second relay normally open contact.

Beneficial effects: The fully hydraulic walking driving device of the combine harvester of the present invention adopts an electronically controlled proportional variable pump and two two-speed variable motors to realize the forward and backward movement of the machine, the switching of the transition speed and the working speed, and the stepless speed change in the whole process; It realizes the functions of cornering differential and anti-skid; it solves the problem of safe start of the control handle in the middle position and the blocking of parking and walking. This design eliminates the mechanical transmission box and differential mechanism of the front axle, reduces the weight of the whole machine, and the hydraulic system is flexible and easy to arrange in space. The fully hydraulic traveling system provides the basis for the intelligent research of combine harvester.

Description of drawings

Fig. 1 is the system composition diagram of the utility model.

FIG. 2 is a system composition diagram of the safety starting device in the utility model.

Fig. 3 is the system composition diagram of the safe walking device in the utility model.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 , the fully hydraulic walking driving device of the combine harvester of the present invention includes an engine 1 , a first variable motor 8 and a second variable motor 9 . The engine 1 is connected to a main variable pump 2 , and the main variable pump 2 There are two ports, namely the oil inlet and the oil outlet, one port is respectively connected to one end of the first variable motor 8 and the second variable motor 9 through the shunt drive valve group 11, the first variable motor 8 and the second variable The other end of the motor 9 is connected with the other port of the main variable pump 2, the main variable pump 2 is connected with the pump variable mechanism 5, the first variable motor 8 and the second variable motor 9 are respectively connected with the motor variable mechanism 10, two two-speed The variable motor drives the two front wheels of the combine harvester respectively, the first variable motor 8 and the second variable motor 9 are connected in parallel with the oil change circuit valve block 7 , the diverter drive valve group 11 and the diverter valve controller 12 The main variable pump 2 is connected with the oil charge pump 3, the oil charge pump 3 supplements the hydraulic oil for the hydraulic system, the oil charge pump 3 is connected with the relief valve 4, and the relief valve 4 is respectively connected with a pair of anti-shock valve groups 6 .

In the utility model, the variable speed system of the device is mainly realized by a variable pump and a variable motor, and the two-speed variable motor has two displacements to realize two vehicle speeds, namely the working gear and the transition gear; the displacement of the electro-hydraulic proportional variable pump is equal to The control current is proportional to the output current, and the output current is controlled by the handle angle to realize the change of the pump displacement from zero to the maximum displacement to realize the stepless speed change of the implement.

The working process of the stepless speed change of the harvester is as follows: after the engine 1 is started, the control handle leaves the neutral position and there is a current output. Different positions of the handle correspond to different control currents. The inclination angle, the larger the current, the larger the inclination angle of the swash plate of the pump, the larger the displacement and the faster the forward speed. When the control handle is pushed in the opposite direction, the oil suction port and the oil outlet port of the main variable pump 2 are exchanged to realize the backward movement of the machine. An electronic two-point control variable motor is used. Normally, the motor is at the maximum displacement. When the control valve electromagnet of the motor variable mechanism 10 is energized, the control piston is pressurized and the motor swings to the minimum displacement. When the harvester is operating, the maximum displacement of the motor is generally selected to output high torque at low speed; the smallest displacement is selected when transitioning, and the output is high speed and low torque. The hydraulic oil at the oil outlet of the main variable pump 2 drives the first variable motor 8 and the second variable motor 9 to work through the shunt drive valve group 11, so as to achieve the purpose of the harvester walking, and the hydraulic oil enters the main variable pump from the oil inlet. 2 in.

The anti-slip working principle of the harvester: the electronically controlled shunt drive valve group 11 is used to realize the shunt and confluence of the two variable pumps. During normal operation, the oil can freely pass through the valve body. When the solenoid valve is energized, fluid is forced into the diverter, preventing idling or overspeeding. When the harvester is running normally, the system is connected to the upper position of the two-position three-way valve of the driving valve group in the figure, and the two variable pumps are output in parallel. At this time, the flow of the left and right wheels is freely distributed according to the different driving resistance of the two wheels, so as to realize straight walking or turning. ; When the ground conditions are not good and one of the wheels slips, if the output is still in parallel, the slip wheel will divert all the flow, and the blocked wheel cannot drive the machine forward. At this time, the diverter valve controller 12 is turned on to make the diverter drive the valve group 11. The middle solenoid valve is energized and the lower position of the two-position three-way valve of the drive valve group is in the position shown in Figure 1. At this time, the hydraulic circuits of the two pumps are forced to enter the diverter to realize independent driving of the two wheels and prevent slippage.

When the harvester is working, in addition to normal walking, turning and stepless speed regulation, it also has the function of starting the engine 1 safely and walking. If the speed control handle of the harvester is not in the neutral position when the engine 1 is started, the handle has current output, and the walking hydraulic system will start, causing the machine to suddenly move forward or backward, causing a safety hazard. Causes severe mechanical friction, wear and heat to cause mechanical damage.

As shown in FIG. 2 , the starting circuit of the engine 1 is connected to a safety starting device, and the safety starting device includes a key switch 13 connected in series, a speed control handle microswitch and a first relay 16 , the speed control handle is slightly The moving switch 14 is connected in parallel with the normally open contact 15 of the first relay 16. When the key switch 13 and the speed control handle micro switch 14 are closed, the first relay 16 is turned on and the normally open contact 15 is closed. The opening and closing of the microswitch 14 of the speed control handle has no effect on the engine 1 . The specific working process is as follows: when the driver rotates the key switch 13, the switch is turned on. If the handle is not in the neutral position, the normally open contact 15 and the microswitch 14 of the speed control handle are all open, and the engine 1 cannot be started; In the neutral position, the microswitch 14 of the speed control handle is closed, the starting circuit of the engine 1 is connected, the first relay 16 is energized, and the normally open contact 15 is closed.

As shown in FIG. 3 , the main variable pump 2 is an electro-hydraulic proportional variable pump, and the control circuit of the electro-hydraulic proportional variable pump is provided with a safety running device. The safety running device includes a handle start switch 17 , a handle start switch 17 and two The branches are connected, one branch is provided with a normally closed contact 19 and a warning light 21 in series, the other branch is provided with a handbrake microswitch 18 and a second relay 20 connected in series, and the handbrake microswitch 18 is connected in parallel with the first relay. Two normally open contacts 22 of the relay 20 . The specific working process is as follows: after the engine 1 is started, push the shift handle, the handle start switch 17 is turned on, if the handbrake is released at this time, the handbrake micro switch 18 is turned on, the second relay 20 is powered, the normally open contact 22 Closed, the normally closed contact 19 is disconnected, the alarm light is off, the variable pump control signal is connected, and the implement runs normally; if the handbrake is not released when the handle start switch 17 is given a signal, the handbrake microswitch 18 and the normally open contact 22 In the open state, the normally closed contact 19 is turned on and the warning light 21 is on, the variable pump cannot be powered and the tool cannot run normally. At this time, the handbrake can be released and the tool can drive, and the warning light is off.

Claims (5)

1. a kind of all-hydraulic travel driving unit of combine harvester, it is characterised in that: including engine, the first variable displacement motor and Two variable displacement motors, the engine are connect with main variable pump, and main variable pump is set there are two port, and a port is driven by shunting Valve group is connect with one end of the first variable displacement motor of driving front-wheel and the second variable displacement motor respectively, and the first variable displacement motor and second becomes The another port of the other end and main variable pump of measuring motor connects, and main variable pump is connect with pump stroking mechanism, the first variable displacement motor It is connect with motor stroking mechanism with the second variable displacement motor.

2. the all-hydraulic travel driving unit of combine harvester according to claim 1, it is characterised in that: first variable Motor and the second variable displacement motor are connected in parallel to circuit valve block of changing oil.

3. the all-hydraulic travel driving unit of combine harvester according to claim 1, it is characterised in that: slippage pump and overflow Valve connection, overflow valve are connect with a pair of of protecting against shock valve group respectively, the port connection of the protecting against shock valve group other end and main variable pump.

4. the all-hydraulic travel driving unit of combine harvester according to claim 1, it is characterised in that: the engine Start-up circuit is connected with safety starting device, and the safety starting device is micro- comprising key switch, the speed adjusting lever being connected in series Switch and the first relay are moved, the normally opened contact of the first relay is connected in parallel on the speed adjusting lever microswitch, works as key When spoon switch and speed adjusting lever microswitch closure, the conducting of the first relay, normally opened contact closure, at this point, speed adjusting lever fine motion Switch opening and closing does not influence engine.

5. the all-hydraulic travel driving unit of combine harvester according to claim 1, it is characterised in that: the main variable pump Start-up circuit for electrohydraulic proportional variable pump, electrohydraulic proportional variable pump is equipped with safe running gear, the safe running gear packet Containing bat-handle start button, bat-handle start button is connect with two branches, and a branch road is arranged in series the normal of the second relay Closed contact and warning lamp, another road are equipped with the parking brake microswitch and the second relay being connected in series, parking brake microswitch On be connected in parallel to the normally opened contact of the second relay.