CN101576738B - Power matching control system for novel energy-saving double-drum vibratory roller - Google Patents

Abstract

The invention discloses a novel power matching control system for an energy-saving double-steel wheel vibratory road roller, which includes a controller, a walking state control device, a frequency adjustment switch, a compaction/walking selection switch for the walking state and compaction state of the road roller, and real-time monitoring of the road roller The speed sensor that detects the engine speed; the solenoid valve of the traveling pump and the solenoid valve of the traveling motor are controlled by the controller; The controllers with staggered power peaks of the system are connected and the electromagnetic valve of the vibrating pump is activated by the controller according to the signal detected by the speed sensor in the compaction mode. The invention is reasonable in design, easy to use and operate, reliable in performance and good in use effect. While reliably suppressing the traveling of the road roller and the instantaneous power of the vibration system, it can also effectively reduce the installed power of the vibratory road roller, reduce power consumption, and save use costs.

Description

A new type of power matching control system for energy-saving double-drum vibratory rollers

technical field

The invention belongs to the technical field of road construction machinery, and in particular relates to a new energy-saving power matching control system for double-drum vibratory road rollers.

Background technique

The double-drum vibratory road roller is a compaction machine for compacting asphalt mixture, and its working objects have relatively high requirements on the quality of the compaction operation. In order to achieve qualified compaction quality, the national standard stipulates that the compaction distance during the working process of the double-drum roller is 60-80 meters, that is, the compaction process of the double-drum vibratory roller is a cyclic vibration compaction operation. Therefore, the tandem roller is a reciprocating operation machine, in which the dynamic process of starting and stopping occupies more than 25% of the total operation time, and the power demand and pressure impact during the starting and stopping process are the largest in the entire operation process. Tests have shown that during the start-up process, the maximum total power required by the vibration system and the travel system is more than twice that of normal compaction operations. In order to meet the dynamic characteristics of the roller, a matching high-power engine is usually used. This will directly bring the following consequences. On the one hand, it will bring about the improvement of engine power matching, and on the other hand, the impact will be too large during the start-up process, and the operation quality will be unqualified.

Compaction machinery usually has a relatively large self-weight, and a large inertial load will inevitably be generated during the state change of a large-mass object. Excessive inertial load will bring excessive instantaneous load to the transmission system, causing deterioration of system dynamic characteristics and engine work. Point offset fuel consumption is high. The traditional method to solve the excessive inertial load of the roller is to increase the engine power reserve and match the engine with higher power to improve the overall dynamic characteristics and avoid the deterioration of the operation quality. However, the above method will have a large amount of power surplus during the stable work process, resulting in unnecessary waste.

At the same time, the working process of the vibratory roller is a dual power system. The walking system and the vibration system are started at the same time when they are started, and they work together during the working process. Since both the walking system and the vibration system are large inertia systems, both systems require a large instantaneous power during the start-up process, which will put a relatively high power requirement on the engine. When the engine power cannot meet the requirements of the dynamic process of the dual system, the dynamic characteristics of the traveling system and the vibration system will deteriorate, which will directly cause serious problems affecting the quality of the work during the start-up phase; and due to the simultaneous start of the dual systems, the peak load of the walking start-up will be formed The coincidence with the peak value of the vibration starting load has to be matched with a high-power engine to ensure normal operation, resulting in a huge waste of power and greatly increasing the cost of the vibratory roller.

The drive systems that drive the above-mentioned double-drum vibratory rollers for vibratory compaction and travel are vibratory hydraulic systems and travel hydraulic systems, of which the vibratory hydraulic systems are mostly pump-controlled dual-motor series systems, and the travel hydraulic systems are mostly pump-controlled dual-motor parallel systems . The pump-controlled motor system is a high-power transmission system, and its system frequency is not high.

Contents of the invention

The technical problem to be solved by the present invention is to provide a new type of power matching control system for energy-saving double-drum vibratory rollers, which is reasonable in design, easy to use, reliable in performance, and good in use effect. While suppressing the instantaneous power of the roller walking and vibration system, it can also effectively reduce the installed power of the vibratory roller, reduce power consumption, and save use costs.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a new energy-saving double-steel-wheel vibratory roller power matching control system, which is characterized in that it includes a controller, the walking speed and the forward and backward direction of the double-drum vibratory roller The traveling state control device for controlling and adjusting, the frequency adjustment switch for controlling and adjusting the operating frequency of the vibratory roller during compaction operation, the compacting/walking for selecting the traveling state and the compacting state of the vibratory roller selector switch and a speed sensor that detects the engine speed of the double-drum vibratory roller in real time; the walking state control device, frequency adjustment switch and compaction/walking selection switch are all connected to the controller; The hydraulic drive system of the traveling mechanism of the road roller performs start-stop and driving volume control. The solenoid valve of the traveling pump and the solenoid valve of the traveling motor are connected to the controller, and both are controlled by the controller; The electromagnetic valve of the vibrating pump for start-stop control of the vibratory compaction hydraulic drive system and the controller that staggers the power peaks of the two power systems of the hydraulic drive system of the traveling mechanism and the hydraulic drive system of vibratory compaction by controlling its start-up time connected, and when the compacting/walking selection switch selects the compacting working mode, the electromagnetic valve of the vibrating pump is controlled and started by the controller according to the speed signal detected by the speed sensor.

The oil inlet passage of the solenoid valve of the walking pump is provided with one or more throttle ports in front of the valve for correspondingly increasing the system damping.

The oil outlet of the solenoid valve of the travel pump is provided with one or more throttle ports behind the valve for correspondingly increasing the system damping.

It also includes a display unit interfaced with the controller.

The walking state control device is a walking state control handle for controlling the hydraulic driving system of the traveling mechanism, and the walking state control handle is connected with the hydraulic driving system of the traveling mechanism through a transmission mechanism.

The frequency adjustment switch is a high frequency/low frequency selection switch.

Compared with the prior art, the present invention has the following advantages:

1. The design is novel, reasonable and highly intelligent, easy to use and operate.

2. It can effectively suppress the instantaneous power of the traveling hydraulic system of the double-drum vibratory roller: since the traveling hydraulic system (that is, the hydraulic drive system of the traveling mechanism) of the double-drum vibratory roller is mostly a pump-controlled dual-motor parallel system; and the pump-controlled motor system is A high-power transmission system, the system frequency is not high, the whole system is controlled by a small closed-loop control of the pump displacement, plus the control mode of the pump-controlled motor system, so in order to suppress the instantaneous power, it is necessary to improve the stability of the system and reduce the To respond to the overshoot, the rapidity of the system must also be satisfied, which requires a moderate increase in the system damping, and at the same time the frequency of the system cannot be reduced. Considering that the pump control motor circuit is the main circuit of the system, any adjustment has a great influence on the power transmission characteristics of the system. Therefore, adjusting the damping characteristics of the small closed loop of the variable variable pump and improving the comprehensive control performance of the entire transmission link is the most effective and most suitable for double drums. The control method of the road roller. Correspondingly, the present invention adopts the method of adding appropriate damping at the inlet of the electromagnetic valve of the variable displacement pump, that is, the electromagnetic valve of the travel pump, or at the outlet at the same time, so as to change the characteristics of the variable displacement pump and control the characteristics of the entire system to suppress the instantaneous power of the system, while also ensuring The corresponding rapidity of the system. Specifically, the present invention is mainly based on the matching of the hydraulic pump and the hydraulic motor, in the case of satisfying the start-up characteristics of the road roller, and according to the size of the inertial load, a suitable node is selected in the oil inlet circuit of the travel pump electromagnetic valve or in the oil outlet circuit at the same time. Orifice, to achieve the purpose of obviously suppressing the inertial impact load and reducing the instantaneous power demand of the hydraulic system, thereby effectively reducing the pressure on the power demand of the engine during the start-up process, reducing the matching power of the engine, so that the engine can meet the requirements of the traveling mechanism for the engine Under the conditions of output power, torque and appropriate margin, reduce the installed power, and at the same time let the hydraulic pump work in the high-efficiency zone, improve the efficiency of the hydraulic system, reduce fuel consumption, improve the mechanical efficiency of the whole machine, reduce noise, and reduce mechanical wear at the same time. Improve the service life of the machine.

3. Since the double-drum vibratory roller adopts the dual power system of the walking hydraulic system and the vibrating hydraulic system, the power demand in the start-up process is a changing process, and the power demand has a peak value. It is necessary to stagger the peak power of the two systems. The present invention adopts The dual-power starting control system specifically determines the maximum power critical point of the walking hydraulic system by testing the speed change of the engine (the maximum load point of the walking hydraulic system is determined according to the engine speed change range), and then matches the starting process of the vibration hydraulic system. Specifically, the start-up control of the present invention is to determine the start-up time of the vibration system by monitoring the rotation speed of the engine, thereby avoiding the superposition of the peak power of the two systems. This method can make both the vibration system and the walking system meet the requirements of rapidity and stability, and at the same time stagger the power peak value between the above two systems, further reducing the power demand of the engine during the starting process. During the control process, the controller can be set according to the program. Determine the best time to start the vibration, so that the power peaks of the start (that is, the start process of the walking hydraulic system) and the start of the vibration (that is, the start process of the vibration hydraulic system) can be effectively staggered, reducing the power demand for the engine and saving energy.

4. High degree of intelligence, easy to use and operate, during the control process, the controller automatically controls the vibration of the vibratory roller, no driver intervention is required, the operation is simplified, and the driver's work intensity is reduced.

5. The start-up power control system of the present invention can effectively suppress the occurrence of the maximum inertial force during the start-up process of the double-drum roller, significantly improve the phenomenon of material moving in the start-up stage of compaction, and improve the compaction quality.

6. The present invention can significantly reduce engine power matching, effectively save fuel consumption and reduce emissions.

To sum up, the present invention is reasonable in design, easy to use, reliable in performance, and good in use effect. While reliably suppressing the instantaneous power of the road roller and the vibration system, it can also automatically judge the vibration start time through the controller according to the compaction operation requirements. , to avoid the power peak intersection of the dual systems (that is, the traveling hydraulic system and the vibrating hydraulic system), to effectively reduce the installed power of the vibratory roller, reduce power consumption, and save use costs.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a circuit block diagram of the present invention.

Fig. 2 is a control flow diagram of the present invention.

Fig. 3 is a hydraulic principle diagram of the hydraulic drive system of the throttle port of the present invention.

Figure 4 is a comparison of the power characteristics of the double-drum vibratory roller before and after the use of the hydraulic drive system with a throttle.

Fig. 5 is a comparison diagram of the load characteristics of the double-drum vibratory roller before and after the use of the present invention.

Fig. 6 is a comparison diagram of the power characteristics of the double-drum vibratory roller before and after the use of the present invention.

Explanation of reference signs:

1-controller; 2-walking state control handle; 3-compaction/walking selection switch;

4-walking motor solenoid valve; 5-vibration pump solenoid valve; 6-walking pump solenoid valve;

7-speed sensor; 8-display unit; 9-high frequency/low frequency selection switch;

10-throttle port before the valve; 11-throttle port after the valve; 12-walking pump;

13-travel motor; 15-overflow valve; 16-flushing valve;

17-charge oil pump; 18-charge oil relief valve.

Detailed ways

As shown in Figure 1, the present invention includes a controller 1, a walking state control device that controls and adjusts the walking speed and the forward and backward direction of the double-drum vibratory roller, and controls the operating frequency during the compaction operation of the double-drum vibratory roller. The frequency adjustment switch for control adjustment, the compaction/running selection switch 3 for selecting the traveling state and the compacting state of the double-drum vibratory roller, and the speed sensor 7 for detecting the engine speed of the double-drum vibratory roller in real time. The walking state control device, frequency adjustment switch and compaction/walking selection switch 3 are all connected to the controller 1 . In addition, the present invention also includes a display unit 8 connected to the controller 1 .

The traveling pump solenoid valve 6 and the traveling motor solenoid valve 4, which control the hydraulic drive system of the traveling mechanism of the double-drum vibratory roller for start-stop and driving volume control, are connected to the controller 1, and both are controlled by the controller 1. Take control. The vibration pump solenoid valve 5 that controls the start and stop of the vibratory compaction hydraulic drive system of the double drum vibratory roller realizes the two dynamics of the hydraulic drive system of the traveling mechanism and the vibratory compaction hydraulic drive system by controlling its start time. The power peaks of the system are staggered with the controller 1, and when the compaction/walking selection switch 3 selects the compaction working mode, the vibration pump electromagnetic valve 5 is started by the controller 1 according to the speed signal detected by the speed sensor 7. .

In this embodiment, the oil inlet passages of the traveling pump electromagnetic valve 6 and the vibrating pump electromagnetic valve 5 are provided with a throttling port. The walking state control device is a walking state control handle 2 that controls the hydraulic driving system of the traveling mechanism, and the walking state control handle 2 is connected with the hydraulic driving system of the traveling mechanism through a transmission mechanism. The frequency adjustment switch is a high frequency/low frequency selection switch 9 . Specifically, the compaction/walking selection switch 3, the walking state control handle 2, the high-frequency/low-frequency selection switch 9 and the speed sensor 7 are respectively connected to the corresponding input ends of the controller 1, and the walking pump electromagnetic valve 6, walking The motor solenoid valve 4 and the vibrating pump solenoid valve 5 are respectively connected to corresponding output ends of the controller 1 .

In conjunction with Fig. 2, the working process of the present invention is: before the operation, first set a walking speed threshold for the start judgment of the vibration hydraulic system by the controller 1, the above-mentioned walking speed threshold is equal to the maximum power critical point of the walking hydraulic system The corresponding walking speed, and then the controller 1 controls the entire start-up process of the double-drum vibratory roller according to the user's input instruction.

When the working mode selected by the driver through the compaction/walking selection switch 3 is "compaction", first select the working frequency of the double-drum vibratory roller through the high-frequency/low-frequency selection switch 9 during compaction operation, and at the same time start the walking hydraulic drive The system drives the double-drum vibratory roller to move forward. Before starting the hydraulic drive system for walking, first select the walking speed and direction of the double-drum vibratory roller through the walking state control handle 2, and the controller 1 controls the handle 2 according to the walking state. The selected above parameters correspondingly send control instructions to the traveling pump electromagnetic valve 6 and the traveling motor electromagnetic valve 4 to control the walking of the double drum vibratory roller; and the start of the vibratory pump electromagnetic valve 5 is controlled by the controller 1 according to the set engine speed threshold. Carry out automatic control, specifically: during the walking process of the double-drum vibratory roller, the speed sensor 7 detects the rotational speed of the engine in real time and transmits the detected signal to the controller 1 synchronously, and the controller 1 sends the speed sensor 7 real-time The incoming engine speed signal is compared with the previous measured engine speed value. When the detected engine speed value no longer decreases, the vibration pump is started, that is, the vibration pump electromagnetic valve 5 is energized, otherwise the vibration pump is not started, which can effectively ensure vibration. The hydraulic system starts at the best time, so as to achieve the purpose of effectively staggering the power peaks of the two systems of walking and vibration, and reducing the power demand for the engine. To sum up, when the working mode selected by the driver is "compaction", the controller 1 first sends control commands to the travel pump solenoid valve 6 and the travel motor solenoid valve 4 according to the travel speed set by the driver, so that the travel pump and the displacement of the walking motor meets the requirements of the driving speed, and the double-drum vibratory roller is started to travel; at the same time, the controller 1 compares the real-time engine speed of the road roller input by the speed sensor 7 with the previously saved engine speed value, and the detected actual When the engine speed no longer decreases, the controller 1 sends a control command to the vibration pump electromagnetic valve 5 to start the vibration of the double steel wheel vibratory road roller.

When the working mode selected by the driver through the compaction/walking selection switch 3 is "walking", the controller 1 only controls the walking speed set by the driver through the walking state control handle 2, and supplies the walking pump solenoid valve 6 and the walking motor solenoid Valve 4 issues a control command to make the displacement of the travel pump and travel motor meet the requirements of the travel speed, so as to start the double drum vibratory roller to travel.

In conjunction with Fig. 3, the hydraulic driving system of the traveling mechanism specifically includes a hydraulic pump that drives the road roller to travel, that is, a traveling pump 12, which is respectively connected to the oil inlet and outlet of the traveling pump 12 through hydraulic pipelines, and is respectively connected to the two-drum vibratory road roller. The two hydraulic motors driven by the front and rear wheels are the travel motor 13, and the two hydraulic motors that control and adjust the oil pressure in the hydraulic pipeline between the travel pump 12 and the travel motor 13 during the forward or backward process of the double drum vibratory roller. A relief valve 15, a traveling pump solenoid valve 6 that controls the start and stop of the traveling pump 12 and the displacement size, is connected with the traveling pump 12 and is connected to the traveling pump solenoid valve 6 and the one-way valve pair that passes through the relief valve 15 The hydraulic circuits between the travel pump 12 and the travel motor 13 respectively carry out a charge pump 17 for oil supply and a flushing valve 16 connected to the travel motor 13 . The travel pump 12 is a variable displacement pump, and the travel motor 13 is a variable displacement motor. The two overflow valves 15 are connected to the hydraulic pipeline between the travel pump 12 and the travel motor 13. 6 and the oil inlet of the overflow valve 15 are connected through a hydraulic pipeline equipped with a supplementary oil overflow valve 18, and the two oil outlets of the travel pump electromagnetic valve 6 are connected to the hydraulic pipeline of the travel pump 12 through the hydraulic pipeline. The valve-controlled oil cylinders are connected, and the two oil outlets are respectively connected to the overflow oil ports of the two overflow valves 15 through hydraulic pipelines. In this embodiment, the oil inlet of the walking pump electromagnetic valve 6, that is, the hydraulic pipeline connected to the oil inlet of the walking pump electromagnetic valve 6, is provided with one or more valve fronts for correspondingly increasing the damping of the system. Orifice 10. At the same time, on the two hydraulic pipelines connected to the two oil outlets of the walking pump solenoid valve 6 respectively, there are one or more valves for correspondingly increasing the system damping. Throttle port 11 after the valve.

At the same time, since the walking pump 12 used in the walking hydraulic system is a variable pump, a damping hole, that is, the throttle port 10 in front of the valve, is added correspondingly on the oil inlet circuit of the variable pump or on the oil inlet circuit and the oil outlet road, and the servo cylinder of the variable pump is provided. The small closed-loop control system adds a damper, and then achieves the purpose of changing the response characteristics of the variable variable pump, changing the input characteristics of the pump-controlled motor system, improving the frequency characteristics of the pump-controlled motor, and effectively suppressing the shock load during the start-up process and the instantaneous power required for start-up.

In the actual manufacturing process, the number and size of the throttle opening 10 in front of the valve and the throttle opening 11 in the rear valve can be adjusted accordingly according to actual needs. The selection and combination of the size and installation position of the throttle port 10 in front of the valve and the throttle port 11 in the rear valve can be determined according to the actual inertial load borne by the double-drum vibratory roller and the response characteristics required by the hydraulic system. Generally speaking: For small rollers, the inertial mass is relatively small, and the inertial load is not very serious, so it is necessary to fully consider the response characteristics of the machine, and only add a throttle port 10 before the valve, and the throttle port before the valve The size of 10 is selected according to the actual acceleration requirements of the roller. When the acceleration requirement is greater, the throttle opening 10 in front of the valve is larger, and vice versa; for medium-sized rollers, the inertial load is already serious. Considering the dynamic characteristics of the machine, as well as the economy and reliability during start-up, a smaller orifice 10 before the valve should be selected, or two slightly larger orifices 10 before the valve and a valve The rear throttle port 11 is matched; for large rollers, the inertial load is relatively serious. At this time, the dynamic characteristics of the roller should take the reliability and operation quality as the primary goal, and take proper care of the power performance. Therefore, the double throttle hole mode must be adopted. That is to say, the method of setting the throttle port 10 before the valve and the throttle port 11 after the valve at the same time is adopted. At the same time, the calculation of the size parameters of the throttle port 10 before the valve and the throttle port 11 after the valve should be carried out in combination with the requirements of the machine characteristics. To sum up, in the present invention, the hydraulic drive system of the traveling mechanism adopted by the double-drum vibratory roller is a hydraulic drive system with a throttle. Combining with Figure 4 and Figure 5, it can be seen that the hydraulic drive system with a throttle can effectively suppress the instantaneous inertial impact load during the start-up process of the double-drum vibratory roller, and can greatly reduce the instantaneous power demand of the double-drum vibratory roller. It can be seen from Fig. 6 that the hydraulic drive system of the traveling mechanism of the double drum vibratory roller adopts the hydraulic drive system of the throttling port, and the hydraulic drive system of the traveling mechanism and the hydraulic drive system of the traveling mechanism are realized by controlling the start time of the electromagnetic valve 5 of the vibration pump After the controller 1 that staggers the power peaks of the two power systems of the vibratory compaction hydraulic drive system, the power matching of the double-drum vibratory roller can be greatly and effectively reduced.

In addition, during the working process of the double-drum vibratory roller, the display unit 8 connected to the controller 1 can directly display the current walking speed and vibration frequency of the double-drum vibratory roller in real time, so that the driver can accurately understand the double-drum vibratory roller. The working status of wheel vibratory roller.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (6)

1. a novel energy-conserving double-steel wheeled vibratory roller power matching control system is characterized in that: comprise controller (1), the walking states control device that the speed of travel and the forward-reverse direction of double-steel wheeled vibratory roller are controlled adjustment, frequency of operation during to the compacting operation of double-steel wheeled vibratory roller is controlled the frequency of adjustment and is adjusted switch, be used to select the compacting/walking selector switch (3) and the real-time speed pickup (7) that the engine speed of described double-steel wheeled vibratory roller is detected of double-steel wheeled vibratory roller walking states and compaction state; Described walking states control device, frequency adjust switch and compacting/walking selector switch (3) all connects controller (1); The traveling pump solenoid valve (6) and the running motor solenoid valve (4) that the travel mechanism fluid power system of described double-steel wheeled vibratory roller are carried out start and stop and the control of drive amount size all join with controller (1), and the two is controlled by controller (1); The vibratory pump solenoid valve (5) that the vibrating compacting fluid power system of described double-steel wheeled vibratory roller is carried out start and stop control with by controlling its realization start-up time the controller (1) that described travel mechanism fluid power system and two dynamic system power peak values of vibrating compacting fluid power system stagger is mutually joined, and vibratory pump solenoid valve (5) is started according to the corresponding control of rate signal that speed pickup (7) is detected by controller (1) when compacting/walking selector switch (3) is selected the compacting mode of operation, the real-time rotating speed to engine of speed pickup (7) detects and the signal Synchronization that is detected is sent to controller (1), controller (1) compares Vibration on Start-up pump when the engine speed value that is detected no longer reduces with engine rotational speed signal and the preceding engine speed value of once surveying that speed pickup (7) imports in real time.

2. according to the described a kind of novel energy-conserving double-steel wheeled vibratory roller power matching control system of claim 1, it is characterized in that: the in-line of described traveling pump solenoid valve (6) is provided with one or more in order to restriction (10) before the valve of corresponding increase system damping.

3. according to the described a kind of novel energy-conserving double-steel wheeled vibratory roller power matching control system of claim 2, it is characterized in that: the vent line of described traveling pump solenoid valve (6) is provided with one or more in order to restriction (11) behind the valve of corresponding increase system damping.

4. according to claim 1,2 or 3 described a kind of novel energy-conserving double-steel wheeled vibratory roller power matching control systems, it is characterized in that: also comprise the display unit (8) that joins with controller (1).

5. according to claim 1 or 2 described a kind of novel energy-conserving double-steel wheeled vibratory roller power matching control systems, it is characterized in that: the walking states joystick (2) of described walking states control device for described travel mechanism fluid power system is controlled, walking states joystick (2) links to each other with described travel mechanism fluid power system by gear train.

6. according to claim 1 or 2 described a kind of novel energy-conserving double-steel wheeled vibratory roller power matching control systems, it is characterized in that: it is high-frequency/low-frequency selector switch (9) that described frequency is adjusted switch.

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