1. A direct gear shifting system with a peristaltic walking function is characterized by comprising a power transmission system and a vibration system, wherein the power transmission system comprises a controller, and an engine, a peristaltic walking system, a direct gear shifting gearbox, a transmission shaft and a drive axle which sequentially transmit power, the peristaltic walking system comprises a main clutch, a peristaltic gear selecting switch and a drive motor which provides power for the main clutch, and the direct gear shifting gearbox, the drive motor and the peristaltic gear selecting switch are respectively connected with the controller; the vibration system comprises a vibration pump, a vibration motor, a hydraulic oil tank, a vibration shaft and an eccentric block.

2. The direct gear shifting system with the peristaltic walking function according to claim 1, further comprising a protection control system for preventing a friction plate of the main clutch from being burnt, wherein the protection control system is connected with the controller.

3. The direct gear shifting system with the peristaltic walking function according to claim 2, wherein the protection control system is a temperature protection control system, the temperature protection control system comprises a temperature sensor and a display device, the temperature sensor is arranged on the main clutch and is connected with the controller through an electric signal, the display device is connected with the controller, and the display device gives an alarm according to temperature information fed back by the temperature sensor.

4. The direct gear shifting system with the peristaltic walking function according to claim 2, wherein the protection control system is a time protection control system, the time protection control system comprises an engine speed sensor, a gearbox input speed sensor and a display device, the engine speed sensor and the gearbox input speed sensor are respectively connected with the controller through electric signals, the display device is connected with the controller, and the display device gives an alarm according to speed information fed back by the engine speed sensor and the gearbox input speed sensor.

5. The direct gear shifting system with the peristaltic walking function according to claim 1, wherein the peristaltic gear selecting switch is m₁、m₂、m₃Three gears.

6. A direct gear shifting method with the peristaltic walking function is characterized by comprising the direct gear shifting system with the peristaltic walking function according to claim 3, and specifically comprises the following steps:

controlling a driving motor to push a main clutch in response to receiving gear information from a peristaltic gear selection switch;

and receiving temperature information fed back by the temperature sensor, and controlling a display device to output alarm information in response to the feedback temperature reaching a preset critical use temperature.

7. The direct gear shifting method with the peristaltic walking function according to claim 6, wherein the step of outputting alarm information is as follows:

setting different critical service temperatures according to the characteristics of different clutch friction plates;

and receiving temperature information of the friction plate fed back by the temperature sensor, and controlling a display device to output alarm information if the temperature of the friction plate exceeds the critical service temperature, wherein the alarm information is character reminding, sound reminding or flash alarm.

8. A direct gear shifting method with the peristaltic walking function is characterized by comprising the direct gear shifting system with the peristaltic walking function according to claim 4, and specifically comprises the following steps:

controlling a driving motor to push a main clutch in response to receiving gear information from a peristaltic gear selection switch;

and receiving rotating speed information fed back by an engine rotating speed sensor and a gearbox input rotating speed sensor, executing a timing instruction, responding to the timing time exceeding the preset contact time, and controlling a display device to output alarm information.

9. The direct gear shifting method with the peristaltic walking function according to claim 8, wherein the step of executing the timing command is as follows:

setting different contact time according to the characteristics of different clutch friction plates;

receiving rotating speed information fed back by an engine rotating speed sensor and a gearbox input rotating speed sensor, if the rotating speed difference occurs between the engine rotating speed and the gearbox input rotating speed, starting timing by a controller, and if not, stopping timing;

and if the continuous timing time exceeds the preset contact time, the controller outputs alarm information to the display device to prompt shutdown and cooling, wherein the alarm information is character reminding, sound reminding or flash alarm.

10. A road roller comprising a direct shift system with a peristaltic walking function as claimed in any one of claims 1 to 5.

Background

The influence of vehicle load and natural factors on a road gradually changes along with the increase of the depth, and in order to adapt to the characteristic, a road structure is divided into a plurality of layers from top to bottom, such as a surface layer, a base layer (generally divided into a base layer and a subbase layer), a roadbed and an embankment, wherein the surface layer and the base layer (including the base layer and the subbase layer) are jointly called a pavement structure layer, and the roadbed and the embankment are jointly called a roadbed. According to different use requirements, stress conditions, soil foundation support conditions and influence degrees of natural factors, the paving materials and the paving thicknesses of all layers are different, correspondingly, the compacting methods and compacting equipment are also different, and usually, the base layer (comprising the base layer and the subbase layer) and the roadbed (comprising the roadbed and the embankment) are compacted by a single-steel-wheel vibratory roller matched with other compacting equipment.

In the power system of the existing vibratory roller, an engine simultaneously provides power for a walking system and a vibration system. Mechanically driven single drum rollers include both traditional mechanically driven rollers and direct shift rollers. As shown in fig. 1, the power transmission route of the direct-shift road roller is an engine, a shock absorber, a direct-shift gearbox, a transmission shaft, a drive axle and a control system, and the direct-shift road roller is simple and convenient to operate and has low requirement on the skill of a driver. The shock absorber is equivalent to an elastic coupling, can realize the gear shifting and gear selecting functions without cutting off power, and output the speed of a stable gear, but cannot be compacted at a low speed.

The power transmission route of the traditional mechanical driving road roller is an engine, a main clutch, a gearbox, a transmission shaft, a drive axle and a control system, a driver can realize the reduction of the running speed of the whole machine through a semi-slip state by stepping on the clutch, the compaction frequency is not changed, the operation is complex, the requirement on the operation skill of the driver is high, the low-speed running state is unstable, and the situation of poor compaction quality is caused. For a direct-shifting road roller, when a base layer and a roadbed are compacted, particularly for special working conditions such as bridge head compaction and seam compaction, in order to ensure the stability of exciting force, the rotating speed of an engine must be kept constant. Because no main clutch realizes the semi-slipping state of power output, the whole machine can only carry out compaction at a fixed speed, cannot realize short-time low-speed peristaltic running, and cannot carry out low-speed compaction on short-distance special working conditions such as bridge head seams, bulges and the like.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a direct gear shifting system with a peristaltic walking function and a direct gear shifting method, and solve the problem that a direct gear shifting road roller in the prior art cannot be compacted in a low-speed running state.

In order to achieve the above object, the present invention adopts the following technical solutions:

a direct gear shifting system with a peristaltic walking function comprises a power transmission system and a vibration system, wherein the power transmission system comprises a controller, an engine, a peristaltic walking system, a direct gear shifting gearbox, a transmission shaft and a drive axle, the engine, the peristaltic walking system, the direct gear shifting gearbox, the transmission shaft and the drive axle sequentially transmit power, the peristaltic walking system comprises a main clutch, a peristaltic gear selecting switch and a drive motor providing power for the main clutch, and the direct gear shifting gearbox, the drive motor and the peristaltic gear selecting switch are respectively connected with the controller; the vibration system comprises a vibration pump, a vibration motor, a hydraulic oil tank, a vibration shaft and an eccentric block.

Preferably, the system further comprises a protection control system for preventing the main clutch friction plate from burning out, and the protection control system is connected with the controller.

Preferably, the system protection control system is a temperature protection control system, the temperature protection control system comprises a temperature sensor and a display device, the temperature sensor is arranged on the main clutch and is connected with the controller through an electric signal, the display device is connected with the controller, and the display device gives an alarm according to temperature information fed back by the temperature sensor.

Preferably, the system protection control system is a time protection control system, the time protection control system comprises an engine speed sensor, a transmission input speed sensor and a display device, the engine speed sensor and the transmission input speed sensor are respectively connected with the controller through electric signals, the display device is connected with the controller, and the display device gives an alarm according to the speed information fed back by the engine speed sensor and the transmission input speed sensor.

Preferably, the peristaltic gear selection switch is m₁、m₂、m₃Three gears.

A direct gear shifting method with a peristaltic walking function comprises the direct gear shifting system with the peristaltic walking function and specifically comprises the following steps:

controlling a driving motor to push a main clutch in response to receiving gear information from a peristaltic gear selection switch;

and receiving temperature information fed back by the temperature sensor, and controlling a display device to output alarm information in response to the feedback temperature reaching a preset critical use temperature.

Preferably, the step of outputting the alarm information is as follows: setting different critical service temperatures according to the characteristics of different clutch friction plates; and receiving temperature information of the friction plate fed back by the temperature sensor, and controlling a display device to output alarm information if the temperature of the friction plate exceeds the critical service temperature, wherein the alarm information is character reminding, sound reminding or flash alarm.

A direct gear shifting method with a peristaltic walking function comprises the direct gear shifting system with the peristaltic walking function and specifically comprises the following steps:

controlling a driving motor to push a main clutch in response to receiving gear information from a peristaltic gear selection switch;

and receiving rotating speed information fed back by an engine rotating speed sensor and a gearbox input rotating speed sensor, executing a timing instruction, responding to the timing time exceeding the preset contact time, and controlling a display device to output alarm information.

Preferably, the step of executing the timing command is as follows: setting different contact time according to the characteristics of different clutch friction plates; receiving rotating speed information fed back by an engine rotating speed sensor and a gearbox input rotating speed sensor, if the rotating speed difference occurs between the engine rotating speed and the gearbox input rotating speed, starting timing by a controller, and if not, stopping timing; if the continuous timing time exceeds the preset contact time, the controller outputs alarm information to the display device to prompt shutdown and cooling, wherein the alarm information is character reminding, sound reminding or flash alarm.

A road roller comprises the direct gear shifting system with the peristaltic walking function.

The invention achieves the following beneficial effects:

1. the invention has the function of creeping walking, can realize high rotating speed of the engine under special working conditions such as bridge head compaction and seam compaction, ensures exciting force and realizes a short-time low-speed running state.

2. The invention is provided with a temperature protection system to prevent the main clutch from being in a half-slipping state for a long time and the temperature is too high to burn out the friction plate.

3. The invention is provided with a time protection system to prevent the main clutch from being in a half-slipping state for a long time and the temperature is too high to burn out the friction plate.

Drawings

FIG. 1 is a schematic diagram of a power transmission path of a prior art direct shift road roller;

FIG. 2 is a schematic representation of the vibration system power transmission operation of the present invention;

FIG. 3 is a schematic illustration of a power transmission path for a first implementation routine of the present invention;

FIG. 4 is a schematic diagram of the operation of the electrical system for a first embodiment of the present invention in a routine function;

FIG. 5 is a schematic illustration of a second embodiment of the power transmission routine of the present invention;

fig. 6 is a schematic diagram of the operation of a second embodiment of the electrical system with routine functions in accordance with the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The embodiment discloses a direct gear shifting system with a peristaltic walking function and a method, wherein an engine is fixed on a machine body and is divided into two paths of power output, one path is a complete machine power transmission system and comprises the engine, the peristaltic walking system, a direct gear shifting gearbox, a transmission shaft, a drive axle and a controller, wherein the peristaltic walking system comprises a main clutch, a drive motor and a peristaltic gear selecting switch, the main clutch is normally closed at ordinary times and is connected between the engine and the direct gear shifting gearbox to play a role of a damper, and the complete machine adopts electric control gear shifting, namely, the gear selecting, gear shifting and reversing processes do not need main clutch operation. The controller controls the starting of the engine according to the gear signal, the main clutch is normally closed during gear shifting, the controller performs logic judgment according to the input signal, the engine power system is controlled to be separated or combined, the electric control gearbox is controlled to shift gears, the gear shifting process is stable, the operation is convenient, the labor intensity of a driver is effectively reduced, and the reliability of the whole machine is improved. The power transmission process of the engine comprises the following steps: the power transmission starts from the engine, passes through the peristaltic walking system and the direct gear shifting gearbox, and reaches the drive axle, so that the whole machine is driven to move forwards or backwards. The other path is a vibration system, as can be seen from fig. 2, the vibration system comprises an engine, a vibration pump, a vibration motor, a hydraulic oil tank, a vibration shaft and an eccentric block, the power output by the engine is transmitted by the power of the vibration system to drive the vibration shaft of the vibration wheel to rotate, the eccentric block on the vibration shaft rotates to enable the whole machine to generate an excitation force, when the engine is at a rated rotation speed, the vibration system of the whole machine generates a stable excitation force, when the rotation speed of the engine is reduced, the excitation force is reduced, and the compaction effect is lower than expected.

When the direct gear shifting road roller drives in a creeping manner, the creeping gear selecting switch is divided into m according to the road condition and the load selection of the whole vehicle₁、m₂、m₃The gear speeds of the three gears are different and are all lower than the normal running speed. The peristaltic gear selection switch is rotated to a designated gear, a signal is transmitted to the controller, the controller acts on the driving motor, the driving motor pushes the main clutch, a pressure plate and a driven plate of the main clutch are in a semi-slipping state, the driven plate transmits a reduced rotating speed, and three peristaltic walks at different speeds are realized through different contact degrees of the pressure plate and the driven plate, so that the whole machine can crawl and run. When the vehicle runs normally and runs in a creeping mode, the rotating speed transmitted to the vibration system by the engine is the rated rotating speed, and the normal compaction effect of the whole vehicle is guaranteed.

Fig. 3 and 4 show a first embodiment of the invention, in the process of peristaltic running, the peristaltic running system is further provided with a temperature protection control system, the temperature protection control system comprises a temperature sensor and a display device, and the temperature sensor is arranged on the main clutch and is connected with the controller through an electric signal. Different critical service temperatures are set according to the characteristics of different clutch friction plates so as to prevent the friction plates from being burnt out when the main clutch is in a half-slipping state for a long time. If the temperature of a clutch friction plate exceeds the critical service temperature when the driver rotates the creep gear selection switch to realize the creep driving of the whole machine, the controller outputs alarm information to the display device, the alarm forms are character reminding, sound reminding or flash alarm and the like, and the situation that the temperature of the friction plate is too high and the machine needs to be stopped for cooling is prompted. In particular, the display device is a meter or a display.

Fig. 5 and 6 show a second embodiment of the invention, in the process of peristaltic driving, the peristaltic walking system may further be provided with a time protection control system, the time protection control system includes an engine speed sensor, a transmission input speed sensor and a display device, and the engine speed sensor and the transmission input speed sensor are respectively connected to the controller through electrical signals. Setting different contact time according to the characteristics of different clutch friction plates, starting timing by the controller when the rotating speed difference occurs between the rotating speed of the engine and the input of the gearbox, or stopping timing, and if the continuous timing time exceeds the preset contact time, prompting the system to give an alarm by the display device in the form of character prompting, sound prompting or flash alarming, and the like, and prompting that the friction plates are long in contact time, too high in temperature and required to be stopped for cooling. In particular, the display device is a meter or a display.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.