What tools can help check the material distribution of the paver?

1. Level meter
Working principle: The position height of the material is measured in different ways. Common ones include ultrasonic level meter, radar level meter, laser level meter, etc. Ultrasonic level meter uses the time of ultrasonic wave reflection on the material surface to calculate the material height; radar level meter determines the position of the material by emitting radar waves and receiving reflected waves; laser level meter measures the material level height based on the reflection of laser beam on the material surface.
Installation location: Generally installed in the hopper, scraper feeder or spiral distributor of the paver. For example, installing an ultrasonic level meter on the side wall of the hopper can monitor the height of the material in the hopper in real time. When the material height reaches the set value, the control system can automatically control the operation of the scraper feeder or spiral distributor to ensure the uniform distribution of the material.
Advantages: Easy installation, simple operation, can monitor the position height of the material in real time and continuously, provide accurate material distribution information to the operator, and facilitate timely adjustment of the working status of the paver to ensure uniform distribution of the material.
2. Camera
Working principle: The camera captures the material distribution during the working process of the paver and transmits the image information to the display screen or monitoring system, so that the operator can intuitively observe the distribution status of the material.
Installation location: Usually installed at different locations of the paver to obtain a comprehensive material distribution image. For example, cameras are installed in front of the screed, above the spiral distributor, inside the hopper, etc. Installing a camera in front of the screed can observe the distribution of the material after paving and determine whether there is segregation or unevenness; installing a camera above the spiral distributor can see the spiral distributor's transportation and distribution of the material, and promptly discover the problem of uneven material distribution; installing a camera inside the hopper can understand the overall situation of the material in the hopper.
Advantages: Provide intuitive material distribution images to help operators more accurately judge the uniformity of material distribution, promptly discover problems and take corresponding measures. At the same time, the camera can also record image information during the construction process, which is convenient for subsequent analysis and summary.
3. Sensor
Working principle: The sensor can detect various parameters of the material, such as the weight, pressure, flow rate, etc. of the material, and infer the distribution of the material by analyzing these parameters. For example, a pressure sensor is installed under the scraper conveyor. When the material passes through the scraper conveyor, the pressure sensor will sense the pressure change of the material. According to the size and distribution of the pressure, it can be judged whether the material is evenly distributed on the scraper conveyor.
Installation location: The sensor will be installed in different locations according to the parameters to be detected and the structural characteristics of the paver. In addition to the bottom of the scraper conveyor, it may also be installed on the shaft of the spiral distributor, the bottom of the ironing plate, and other locations. Installing a torque sensor on the shaft of the spiral distributor can measure the torque change of the spiral distributor, so as to understand the resistance of the material during the distribution process and indirectly judge the uniformity of the material distribution; installing a flatness sensor at the bottom of the ironing plate can detect the flatness of the ironing plate during the paving process, which is also closely related to the uniformity of the material distribution.
Advantages: It can monitor various parameters of the material in real time, provide multi-dimensional data support for judging the material distribution, and improve the accuracy and reliability of the detection. And it can be combined with the control system of the paver to realize automatic material distribution control.
4. Nuclear density meter
Working principle: Use the radiation emitted by radioactive elements to penetrate the material, and measure the density of the material according to the attenuation degree of the radiation. Materials of different densities have different degrees of absorption and attenuation of radiation. By detecting the intensity change of the radiation, the density of the material can be calculated.
Installation location: Generally, the detection is carried out on the pavement after paving. The operator holds the nuclear density meter and selects measurement points on the pavement according to certain intervals and methods to measure the density of the material.
Advantages: The density of the paved material can be measured quickly and accurately. By analyzing the density data at different positions, the uniformity of the material distribution can be judged. Moreover, the operation is relatively simple, and no complicated modification or installation of the paver is required.
5. Laser flatness meter
Working principle: Scan the road surface with a laser beam to measure the flatness data of the road surface. When the laser beam is irradiated on the road surface, different light signals will be reflected back according to the undulation of the road surface. The laser flatness meter receives these signals and analyzes and processes them to obtain the flatness index of the road surface.
Installation location: usually installed at the rear of the paver, moving with the paver, and measuring the flatness of the pavement in real time.
Advantages: It can timely reflect the surface flatness of the paving material, and the uniformity of material distribution will directly affect the flatness of the road surface. Through the measurement data of the laser flatness meter, the operator can indirectly judge whether the material distribution is uniform, and adjust the working parameters of the paver in time to improve the paving quality.
In addition to the above tools, there are some other methods and tools that can also be used to check the material distribution of the paver, such as:
Add markers to the material: such as colored particles, fluorescent powder, etc. During the paving process, observe the distribution of markers on the road surface to infer the uniformity of material distribution.
Analyze construction data: Analyze the construction data of the paver, such as the paver's driving speed, the speed of the spiral feeder, the speed of the scraper chain and other parameters, and judge whether the material distribution is uniform by analyzing the relationship between these data and material distribution.