CN206803992U - A kind of mechanism of quick measurement wood craft machines flatness - Google Patents

Abstract

A detection mechanism for the flatness of woodworking machine tools that can be quickly measured. It includes the whole mechanism, an adjustable support for fixing and a displacement sensor. The whole mechanism is made of light metal aluminum alloy. The hole structure of the fixed displacement sensor is convenient for installing the displacement sensor and reducing the mass. The mechanism has three conical supports, and one foot is equipped with an adjustable support. The utility model patent has the advantages of rapid measurement, convenient use and light weight, and is suitable for use in the flatness measurement of woodworking machine tools.

Description

A mechanism for quickly measuring the flatness of woodworking machine tools

technical field

The utility model relates to a measuring tool for measuring a woodworking machine tool or related machinery, in particular to a measuring tool for measuring flatness.

Background technique

The standard of the Ministry of Machinery Industry stipulates that my country uses the "three-point method" to detect the flatness of the work surface of woodworking machine tools. The so-called "three-point method" is to use the plane passing the farthest three points on the inspected plane as the datum plane, and the maximum algebraic difference of the distance between each measuring point on the inspected plane and the datum plane is the flatness of the inspected plane error.

In our country, the manual "three-point method" was first used to measure the flatness of the rectangular workbench plane. The principle of the manual "three-point method" to measure the flatness is shown in Figure 1, that is, it is inspected with a flat ruler and a gauge block. Select three points a, b, and c on the plane to be tested as reference points, and place three gauge blocks of equal thickness on these three points. The upper surface of these gauge blocks is the plane to be tested as a reference plane for comparison. Put the flat ruler on the thickness gauge blocks such as a and c, and place an adjustable gauge block at point e on the plane to be inspected so that it is in contact with the lower surface of the flat ruler. At this time, the gauge blocks a, b, c and e The upper surfaces are all in the same plane. Then place the ruler on the measuring blocks at points b and e, and place an adjustable measuring block at point d to make it contact with the lower surface of the ruler. Put the ruler on a and d, b and c, d and c, and you can measure the deviation of each point on the inspected surface. The deviation of a point inside a rectangle or a square can also be obtained in this way: place an adjustable gauge block on the known points f and g, adjust the adjustable gauge block to the exact height of the point from the datum plane; place a ruler on the two sides On the adjustable gauge block, use the adjustable gauge block (or block gauge and feeler gauge) to measure the deviation between the inspected plane and the flat ruler. The maximum difference between each measuring point and the flat ruler is the flatness value of the surface. Compared with the original "two-point method", it can not only improve the detection accuracy, but also improve the measurement efficiency. But the operation is still more troublesome.

Utility model content

The purpose of the utility model is to quickly and accurately measure the flatness of a woodworking machine tool with a displacement sensor, which is easy to fix and install, has a simple structure, is convenient to operate, and greatly improves the measurement efficiency. The utility model can determine a datum plane through three points, and can detect under the premise of ensuring the unity of the datum, and no deviation will occur due to datum transformation. The mechanism of the utility model is provided with a plurality of grooves and hole structures, which reduces the weight while facilitating the installation of sensors.

The integration of the instrument makes the measurement accuracy higher, and the material is made of aluminum alloy, which is not only light in weight, but also strong in deformation resistance. The groove and hole structure on the mechanism are not only used to install the sensor but also reduce the weight of the mechanism, and it is also convenient to operate 22 The displacement sensor measures and collects data, and converts the analog signal measured by the sensor into a digital signal through the AD converter and imports it into the computer through the USB interface. Use the program to find the fitting plane formed by the coordinate values of the imported points, and then pass The sum of the distance from the point above the fitting plane farthest from the fitting plane to the fitting plane and the distance from the point below the fitting plane farthest from the fitting plane to the fitting plane is the flatness of the measured plane. Make the flatness measurement and calculation process more convenient and quick.

Description of drawings

Figure 1 is a schematic diagram of the principle of manual "three-point method" woodworking planer flatness detection

Figure 2 and Figure 3 are schematic diagrams of the utility model mechanism

Figure 4 is a schematic diagram of an adjustable displacement support for a fixed mechanism

Figure 5 is a schematic diagram of the displacement sensor

detailed description

As shown in Figure 2 and Figure 3, the patented mechanism of the utility model is integrated, and is made of aluminum alloy, which is light in weight, and the plane of the woodworking machine tool table is often large, requiring light weight instruments, which are easy to operate and can also speed up the measurement speed. The anti-deformation ability is strong. Since the mechanism needs to cooperate with the displacement sensor for measurement, the requirements for the anti-deformation ability of the material are very high, and the mechanism must not be deformed, otherwise the measurement accuracy will be affected. Three feet (4, 5, 6) build a reference plane, and the fourth foot (3) of the mechanism is installed with an adjustable displacement support, so that the whole mechanism is fixed on the plane (1) of the tested workbench, and the lower surface of the mechanism and the The constructed datum planes are parallel, so 22 displacement sensors (7) are directly installed in the hole structure inside the groove, and the corresponding distance is measured between the lower surface and the measured plane (1), which is the relative height difference, Because the whole mechanism is in the shape of a "meter", there are 22 holes in the groove (2) of the mechanism, and 22 displacement sensors are installed in 22 holes for measurement, and the holes are fixed with the lower ends of the displacement sensors. The measurement time is shortened, thereby improving the measurement efficiency. Connect the extension cable of the sensor through the front-end device. Since the displacement sensor used in this mechanism is suitable for high-precision measurement, the obtained analog signal cannot be directly used for subsequent computer processing. The analog signal is converted into a digital signal through an AD converter. Then, import it into the computer through the USB interface and perform calculations through software with related calculation programs to calculate the distance from the point above the fitting plane farthest from the fitting plane to the fitting plane and the distance from the point below the fitting plane farthest from the fitting plane The sum of the distances from the points to the fitting plane is the flatness of the measured plane, and the flatness calculation result is output to complete the measurement of the flatness of the tested plane.

Claims (4)

1. A mechanism for quickly measuring the flatness of woodworking machine tools, which is characterized in that the periphery of the mechanism is a rectangular structure, and the interior is a "meter"-shaped structure. The periphery and the interior of the mechanism are integrally formed, and the mechanism includes three feet with a circular platform (4 , 5, 6) form a reference plane, fixed on the measured plane through the fourth adjustable support (3) with adjustable displacement, and cooperate with multiple displacement sensors, which include multiple displacement sensors (7) to be measured The measuring plane (1) is used for measurement, and a plurality of grooves (2) for installing displacement sensors are arranged inside the mechanism. 2. A mechanism for quickly measuring the flatness of woodworking machine tools according to claim 1, characterized in that the connection between the adjustable support and the mechanism is screw connection. 3. A mechanism for quickly measuring the flatness of a woodworking machine tool according to claim 1, characterized in that the adjustable support is a circular frustum. 4. A mechanism for rapidly measuring the flatness of a woodworking machine tool according to claim 1, wherein the mechanism uses aluminum alloy as a material.