WO2022083078A1

WO2022083078A1 - Spreader having double material level sensors and method for controlling material level height

Info

Publication number: WO2022083078A1
Application number: PCT/CN2021/086989
Authority: WO
Inventors: 王友宝; 井然
Original assignee: 徐工集团工程机械股份有限公司道路机械分公司
Priority date: 2020-10-23
Filing date: 2021-04-13
Publication date: 2022-04-28
Also published as: CN112229481A; DE112021005619T5

Abstract

A spreader having double material level sensors and a method for controlling a material level height. The spreader is provided with a material distributing device (2) and a telescopic screed (1), wherein the telescopic screed (1) comprises a basic section screed (11) and a telescopic section screed (12) arranged on the rear side of the basic section screed, the telescopic section screed (12) can transversely move relative to the basic section screed (11), and a front baffle (13) connected to the basic section screed (11) is arranged at the front side of the telescopic section screed (12); and the spreader further comprises a first material level sensor (3), a second material level sensor (4) and a material level controller (5), wherein the first material level sensor (3), the second material level sensor (4) and the material distributing device (2) are all in signal connection with the material level controller (5), the first material level sensor (3) is used for detecting first material level height information in a material tank, the second material level sensor (4) is used for detecting second material level height information in a material accommodating cavity, and the material level controller (5) is used for controlling the rotating speed of the material distributing device (2) and/or the starting and stopping of the material distributing device. The spreader can automatically adjust the material level height between the telescopic section screed (12) and the front baffle (13), thereby reducing the labor intensity of an operator, and improving the spreading quality.

Description

A paver with dual material level sensors and material level height control method

technical field

The invention relates to the technical field of paver, in particular to a paver with dual material level sensors and a material level height control method.

Background technique

The paver usually includes a traveling device, a hopper, a feeding device, a material distribution device, a screed, etc. The traveling device is used to drive the paver forward, the hopper is used to receive and store the paving materials, and the feeding device is used to transfer the inside of the hopper. The paving material is conveyed to the rear of the paver and before the screed, the distribution device is used to convey the paving material conveyed by the conveying device to the entire paving width, and the screed is located behind the paver and is used to distribute the paving material. Preliminary compaction, smoothing and final shaping. The screed usually includes a mechanical screed and a telescopic screed. The mechanical screed realizes different working widths by using fasteners to assemble lengthened sections of different widths. That is, perpendicular to the forward direction of the paver) expansion and contraction can easily change the working width.

The most common telescopic screeds at present include a base section screed and left and right telescopic section screeds which are arranged on the rear side of the base section screed and can move laterally relative to the base section screed. In order to reduce the amount of material in front of the telescopic section screed, reduce the load and deformation of the screed and improve the paving quality, the front of the telescopic section screed is often connected to the basic section screed and is generally flush with the front of the basic section screed. front bezel. The front baffle can be arranged as a whole to move laterally relative to the base section screed and follow the telescopic section screed, or be arranged so that one part of it can move laterally relative to the other section and the movable section follows the telescopic section screed , to accommodate varying paving widths. It is also understood that in some cases where the paving width is relatively fixed, it is also possible to manually adjust the front baffle or a portion of the front baffle to adapt it to the paving width.

The material conveyed by the distributing device to the front side of the telescopic section screed first passes under the front baffle and enters between the front baffle and the telescopic section screed, and then the telescopic section screed forms the pavement. Ideally, the height of the material level between the front baffle and the telescopic section (that is, the height of the paving material) should not only meet the amount of material required by the telescopic section screed to pave the formed road, but also maintain a relatively low and stable level. height, in order to reduce the material resistance of the telescopic section screed and ensure good paving quality.

Within the width of the telescopic screed, the front side of the distribution device is often provided with a baffle plate, and the baffle plate of the distribution device and the front baffle of the telescopic screed together constitute the pavement conveyed by the distribution device. Material hopper. It is well known in the industry that a material level sensor is provided to detect the material level height at both ends of the material distribution device in the material tank, and the controller controls the start, stop and/or speed of the material distribution device to maintain a stable material level in the material tank. To ensure good pavement quality, the prior art does not help to control the height of the material level between the telescopic section screed and the front baffle.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a paver with dual material level sensors and a material level height control method, so as to solve the difficulty of maintaining the material level height between the telescopic section screed and the front baffle at a stable height caused by the prior art. question.

To achieve the above object, the present invention adopts the following technical solutions to realize:

A paver with dual material level sensors includes a material distribution device and a telescopic screed, including a material level sensor 1, a material level sensor 2 and a material level controller, the telescopic screed includes a base section screed and a telescopic section screed flat plate, the telescopic section screed is arranged behind the base section screed and can move laterally relative to the base section screed, the front side of the telescopic section screed is provided with a front baffle connected to the base section screed, the front baffle A material chamber is formed between the plate and the telescopic screed, and a material trough is formed between the front baffle and the baffle plate of the material distribution device;

The material level sensor 1, the material level sensor 2 and the material distribution device are all signally connected to the material level controller, and the material level sensor 1 is used to detect the first material level height information in the material tank. The second material level sensor is used to detect the second material level height information in the material cavity, and the material level controller is used to control the rotation speed of the material distribution device and/or the start and stop of the material distribution device.

Further, a side baffle is also included, the side baffle is connected to the end of the telescopic section screed in the width direction, and the end of the front baffle is connected to the side baffle.

Further, both the material level sensor 1 and the material level sensor 2 are installed on the side baffle, the material level sensor 1 is located within the range of the material trough in the front-rear direction, and the material level sensor 2 It is located within the range of the material volume in the front-to-rear direction.

Further, the first material level sensor and the second material level sensor are both ultrasonic sensors.

The present invention also provides a method for controlling the material level height of a paver with dual material level sensors as described above, which is characterized in that it includes the following steps:

The material level sensor 1 detects the height information of the first material level in the material trough, and the material level sensor 2 detects the height information of the second material level in the material cavity;

The material level controller receives the first material level height information and the second material level height information, and judges whether the first material level height information deviates from the preset ideal first material level height information. The position controller controls the speed of the distributing device and/or the start and stop of the distributing device;

The material level controller determines whether there is a difference between the second material level height information and the preset ideal second material level height information. If there is a difference, the material level controller lowers or increases the ideal first material level height. information.

Further, if there is a difference, the material level controller lowering or raising the ideal first material level height information specifically includes the following steps:

If there is a difference and the difference is positive, the material level controller lowers the ideal first material level height information; if there is a difference and the difference is negative, the material level controller increases the ideal first material level height information.

Further, the difference between the adjusted ideal first material level height information and the unadjusted ideal first material level height information is within the set threshold range.

Further, the difference between the adjusted ideal first material level height information and the unadjusted ideal first material level height information is proportional to the difference between the second material level height information and the ideal second material level height information. value.

Further, after the material level controller adjusts the ideal first material level height information, the ideal first material level height information can be adjusted again after a certain interval of time.

Further, the time interval for adjusting the ideal first material level height information again is the time required for the distance between the front baffle of the paver and the telescopic section screed.

According to the above technical solutions, the embodiments of the present invention have at least the following effects:

1. The paver of this device has a material level sensor 1 for measuring the material level height in the material trough and a material level sensor 2 for measuring the material level height in the material cavity. Both sensors are signally connected to the material level controller. The controller can control the rotation speed and/or start and stop of the material distribution device. When there is a deviation between the material level height in the material chamber and the ideal material level height, the deviation between the two can be eliminated by controlling the material distribution device, so that the material content can be reduced. The material level in the cavity is always at the ideal height, which reduces the labor intensity of the operator and improves the paving quality;

2. This method compares the first material level height information with the ideal first material level height information, and controls the material distribution device through the comparison results. The material distribution device can adjust the height of the material in the material trough, so that the measured actual material level The height is consistent with the ideal material level height; by comparing the second material level height information with the ideal second material level height information, the first ideal material level height information is adjusted through the comparison result, so that the first ideal material level height information and the actual One material level height information is different and the first material level height information in the material trough is controlled, and the first material level height information affects the second material level height information, so as to realize the second material level height information and the second ideal material level height information. Balance, this method keeps the height information of the second material level in the material cavity always at the ideal height, which reduces the labor intensity of the operator and improves the paving quality;

3. In this method, after the material level controller is set to adjust the ideal first material level height information, it needs to be adjusted again after a certain period of time, so as to avoid the problem of overshoot or excessive frequent adjustment, and ensure the accuracy of material level control.

Description of drawings

1 is a front view of a specific embodiment of the present invention;

FIG. 2 is a top view of a specific embodiment of the present invention.

Among them: 1- screed, 11- base section screed, 12- telescopic section screed, 13- front baffle, 14- side baffle, 2- material distribution device, 3- material level sensor 1, 4- material level Sensor two, 5-level controller.

Detailed ways

In order to make the technical means, creative features, achievement goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to the specific embodiments.

It should be noted that, in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer" and the like indicate the orientation or position The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. The terms "front", "rear", "left", "right", "upper" and "lower" used in the description of the present invention refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to is the direction toward or away from the geometric center of a particular part.

As shown in Figures 1 to 2, the present invention provides a paver with dual material level sensors, including a material distribution device and a telescopic screed 1, and also includes a material level sensor 1 3, a material level sensor 2 4 and a material level The controller 5, the telescopic screed 1 includes a base section screed 11 and a telescopic section screed 12, the telescopic section screed 12 is arranged behind the base section screed 11 (the rear front is left and right in the direction shown in the figure) and can be relative to the base The segment screed 11 moves laterally. The front side of the telescopic segment screed 12 is provided with a front baffle 13 connected to the base segment screed. A material chamber is formed between the front baffle 13 and the telescopic segment screed 121. A material chute is formed between it and the baffle plate of the material distribution device.

Material level sensor 1 3, material level sensor 2 4 and material distribution device are all connected with material level controller 5 by signal, material level sensor 1 3 is used to detect the height information of the first material level in the material trough, material level sensor 2 4 is used for In order to detect the height information of the second material level in the material cavity, the material level controller 5 is used to control the rotation speed of the material distribution device and/or the start and stop of the material distribution device.

The paver of the device has a material level sensor 1 3 for measuring the material level height in the material trough and a material level sensor 2 4 for measuring the material level height in the material cavity. The position controller 5 can control the rotation speed and/or start and stop of the material distribution device. When there is a deviation between the material level height in the material cavity and the ideal material level height, the deviation between the two can be eliminated by controlling the material distribution device, so that the The material level in the material cavity is always at the ideal height, which reduces the labor intensity of the operator and improves the paving quality.

In this embodiment, the material level sensor 1 3 and the material level sensor 2 4 are preferably separate sensors, so that the material level sensor 1 3 and the material level sensor 2 4 can be easily arranged to ideal installation positions respectively. However, it is also conceivable that the material level sensor 1 3 and the material level sensor 2 4 can also be integrated into one sensor, and the material level height 1 at both ends of the material distribution device and the telescopic section screed can be detected simultaneously or sequentially in time. The material level between 121 and the front baffle 13 is two.

The practical application of the present invention is determined, and the more convenient application is as follows: the material level sensor 1 3 and the material level sensor 2 4 are respectively set at both ends of the width direction of the paver (the front and rear directions in the figure), so as to perform complete automatic control and reduce operation. workload of personnel. Specifically, the material level sensor 1 3 is located within the range of the material trough in the front and rear direction (the left and right directions in the figure), and the material level sensor 1 3 is provided at both ends of the material trough; the material level sensor 2 4 is located in the front and rear direction of the material. Within the range of the cavity,

material level sensors

2 and 4 are arranged at both ends of the material cavity. Then it is also conceivable that, in some cases, level sensor one 3 and level sensor two 4 are only installed on one side of the paver and only one or both of the two level sensors are installed on the other side. Neither is installed, that is, one side is automatically controlled and the other side is manually or semi-automatically controlled.

The material level controller 5 is preferably the controller on the existing main console on the paver, so as to simplify the arrangement of components and reduce costs; however, the material level controller 5 is provided separately, or the material level controller 5 and the material level sensor-3 are provided. It is also feasible to integrate one of the

material level sensors

2 and 4.

The ideal material level height 1 and the ideal material level height 2 are preferably set on the material level control for more convenient control. However, it is also feasible to set the ideal material level height 1 and the desired material level height 2 on the material level sensor 1 3 and material level sensor 2 4 respectively. The initial ideal material level height, depending on the specific working conditions, can be the material level that just completely covers the distributing blade of the distributing device or covers 2/3 of the distributing blade and is set by the operator. Once the initial setting is completed, the subsequent The material level controller 5 automatically adjusts the parameter of the ideal material level height, and of course, the operator can also manually adjust the ideal material level height again. The initial ideal material level height can be about 5 cm to 10 cm higher than the bottom surface of the telescopic section screed 12 depending on the specific working conditions, and is set by the operator.

In an embodiment of the present invention, the material level sensor 1 3 and the material level sensor 2 4 are preferably ultrasonic sensors, of course, a mechanical contact sensor or a laser sensor is also feasible. The material level sensor 1 3 and the material level sensor 2 4 are preferably installed on the side baffle 14. The installation position of the material level sensor 1 3 can be located at or near the center of the material distribution device when viewed from the side. The installation position of the material level sensor 2 4 Viewed from the side, it can be located between the telescopic section screed 12 and the front baffle 13 and preferably in the vicinity of the middle of the two. In the case where the material level sensor 1 3 and the material level sensor 2 4 are integrated into one sensor, the integrated sensor can be arranged at the position of the front baffle 13 when viewed from the side and detect the material level heights on the front and rear sides of the front baffle 13 respectively. .

Based on the structure of the paver of the present invention, the present invention also provides a material level height control method for a paver with dual material level sensors, comprising the following steps:

The material level sensor 1 3 detects the first material level height information in the material tank, and the material level sensor 2 4 detects the second material level height information in the material cavity; the material level controller 5 receives the first material level height information and the second material level height information. Material level height information, and determine whether there is a deviation between the first material level height information and the preset ideal first material level height information, if there is a deviation, the material level controller 5 controls the rotating speed and/or the dividing The material level controller 5 judges whether there is a difference between the second material level height information and the preset ideal second material level height information, if there is a difference, the material level controller 5 adjusts down or Increase the ideal first material level height information.

The method compares the first material level height information with the ideal first material level height information, and controls the material distribution device through the comparison result. The material distribution device can adjust the height of the material in the material trough, so that the measured actual material level height and The ideal material level height is consistent; through the comparison of the second material level height information and the ideal second material level height information, the first ideal material level height information is adjusted through the comparison result, so that the first ideal material level height information and the actual first material level height information The information of the height of the first material level in the trough is controlled by the information of the height of the first material level. The information of the height of the first material level affects the information of the second material level, so as to realize the balance between the information of the second material level and the second ideal material level. The method keeps the height information of the second material level in the material cavity always at an ideal height, reduces the labor intensity of the operator, and improves the paving quality.

It is easy to understand that when the material level detected by the material level sensor-3 is lower/higher than the ideal material level, the material level controller 5 controls the material distribution device to speed up/slow down the speed until the material level is equal to the ideal material level. The bit height or the deviation between the two can be ignored, and the greater the deviation, the greater the degree to which the controller adjusts the speed of the dispensing device.

When the material level height 2 detected by the material level sensor 2 4 is larger/lower than the ideal material level height 2, the material level controller 5 lowers/raises the ideal material level height 1 from the current value to the new set value. And the material level controller 5 adjusts the start-stop and/or the rotational speed of the material distribution device again based on the new set value of the ideal material level height 1 until the material level height 1 is equal to the new set value of the ideal material level height 1 or between the two. The deviation can be ignored.

Advantageously, the absolute value of the difference between the new set value of the ideal material level height 1 for a single adjustment and the current value does not exceed a limit value, so as to avoid excessive and rapid changes in the material level height in the material distribution tank. affect the quality of pavement. The limit value can be a certain proportion of the maximum adjustment range of the ideal material level height 1, and in this embodiment, 10% to 20% can be selected.

Advantageously, within the limit that the absolute value of the difference between the new set value of the ideal material level height 1 and the current value does not exceed a limited value, the difference value is proportional to the ideal material level height 2 relative to the material level sensor 2 4. The deviation 2 between the detected material level heights, that is, the greater the deviation 2, the greater the adjustment degree of the ideal material level height 1. It is easy to imagine that if the adjustment amount calculated in proportion according to the deviation 2 exceeds the limited range, the adjustment is performed according to the maximum allowable adjustment amount defined in the limited range.

It is understandable that adjusting the ideal material level height 1 and then adjusting the start/stop/speed of the material distribution device will not immediately cause a change in the material level height 2, but there will be a response lag, that is, after a period of time, the material level height 2 will not change. will change. Therefore, it is advantageous that after the material level controller 5 adjusts the ideal material level height 1 once, the ideal material level height 1 is adjusted again only after a certain time interval, so as to avoid overshoot and excessive frequent adjustment.

Advantageously, the time interval is proportional to the time elapsed when the distance the paver travels forward is equal to the distance between the front baffle 13 and the telescopic section screed 12, that is, the faster the paver travels forward, the higher the speed. Faster, the shorter the time interval. Advantageously, the aforementioned ratio is 1, of course, a coefficient between 0.5 and 2 is also feasible.

At present, the paver usually has the function of detecting the running speed, and the distance between the front baffle 13 and the telescopic screed 12 can be preset in the controller, so it is easy to know the specific distance the paver travels. required time.

It is known from the technical common sense that the present invention can be realized by other embodiments without departing from its spirit or essential characteristics. Accordingly, the above-disclosed embodiments are, in all respects, illustrative and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

A paver with dual material level sensors, including a material distribution device and a telescopic screed, is characterized in that it includes a material level sensor 1, a material level sensor 2 and a material level controller, and the telescopic screed includes a base section screed. and a telescopic section screed, the telescopic section screed is arranged behind the base section screed and can move laterally relative to the base section screed, and the front side of the telescopic section screed is provided with a front baffle connected to the base section screed, A material chamber is formed between the front baffle and the telescopic screed, and a material trough is formed between the front baffle and the baffle plate of the material distribution device;

The material level sensor 1, the material level sensor 2 and the material distribution device are all signally connected to the material level controller, and the material level sensor 1 is used to detect the first material level height information in the material tank. The second material level sensor is used to detect the second material level height information in the material cavity, and the material level controller is used to control the rotation speed of the material distribution device and/or the start and stop of the material distribution device.
The paver with dual material level sensors according to claim 1, further comprising a side baffle, the side baffle is connected to the end of the telescopic section screed in the width direction, the front baffle The end is connected with the side baffle.
The paver with dual material level sensors according to claim 2, wherein the material level sensor 1 and the material level sensor 2 are both installed on the side baffle, and the material level sensor 1 is in The second material level sensor is located within the range of the material chamber in the front-rear direction.
The paver with dual material level sensors according to any one of claims 1 to 3, wherein the first material level sensor and the second material level sensor are both ultrasonic sensors.
A material level height control method for a paver with dual material level sensors according to any one of claims 1 to 4, characterized in that, comprising the steps of:

Material level sensor 1 detects the height information of the first material level in the material trough, and material level sensor 2 detects the height information of the second material level in the material container;

The material level controller receives the first material level height information and the second material level height information, and judges whether the first material level height information deviates from the preset ideal first material level height information. The position controller controls the speed of the distributing device and/or the start and stop of the distributing device;

The material level controller determines whether there is a difference between the second material level height information and the preset ideal second material level height information. If there is a difference, the material level controller lowers or increases the ideal first material level height. information.
The method for controlling the material level height of a paver with dual material level sensors according to claim 5, wherein if there is a difference, the material level controller lowering or raising the ideal first material level height information specifically includes the following steps :

If there is a difference and the difference is positive, the material level controller lowers the ideal first material level height information; if there is a difference and the difference is negative, the material level controller increases the ideal first material level height information.
The method for controlling the material level height of a paver with dual material level sensors according to claim 5, wherein the difference between the adjusted ideal first material level height information and the unadjusted ideal first material level height information The difference is within the set threshold.
The method for controlling the material level height of a paver with dual material level sensors according to claim 5, wherein the difference between the adjusted ideal first material level height information and the unadjusted ideal first material level height information The difference is proportional to the difference between the second material level height information and the ideal second material level height information.
The method for controlling the material level height of a paver with dual material level sensors according to claim 5, characterized in that, after the material level controller adjusts the ideal first material level height information, it takes a certain time interval to adjust the ideal first material level again. A level height information.
The method for controlling the material level height of a paver with dual material level sensors according to claim 9, wherein the time interval for adjusting the ideal first material level height information again is from the baffle plate before the paver runs to the telescopic section screed. the time required for the distance between them.