Daisang, also known as Kerria japonica, is a deciduous shrub belonging to the Rosaceae family. It is native to regions ranging from the Yellow River basin to southern and southwestern China. This attractive plant features upright branches that are green and often ribbed, with a height of 1.5 to 2 meters. Its leaves are alternate, ovate to elliptic-ovate in shape, and have serrated edges. The plant produces solitary flowers on its branches, each with five golden-yellow petals. Blooming occurs from April to May, and during early summer, the golden blossoms sway gently on the soft branches, creating a beautiful sight. The fruit is an achene, dark brown in color, and grows on a disk-shaped receptacle, with the sepals remaining attached. Daisang is admired for its flowers in summer and its green foliage in winter. In gardens, it can be planted in clusters along fences, walls, water edges, slopes, forest borders, or lawns, or used as hedges. It pairs well with rockeries and other ornamental features. Daisang is also known for its tolerance to semi-shade and slight salinity, making it suitable for a variety of garden conditions. It thrives best in neutral soils. Propagation is typically done through ramets or cuttings, especially for less vigorous plants. In northern China, old roots are dug up before spring sprouts appear. The roots are then cut with a knife, and the branches are removed and planted in soil. Watering should be done two to three times initially, followed by regular watering. Before winter, sufficient frozen water should be provided to help the plants survive the cold. For cutting propagation, it's common to take cuttings in early spring. Pruning and shaping are combined, and branches with high lignification (about 10–15 cm long) are cut and inserted into loose, previously tilled soil. The spacing can be adjusted based on the desired planting density. Keep the soil moist until rooting occurs, after which normal care can begin. During the growing season, regular watering and weeding in summer are essential. After autumn, old branches and spent flowers should be pruned lightly. Applying organic fertilizer twice a year—in spring and autumn—helps maintain plant health. In winter, ensure enough frozen water is provided to protect the roots. Pests such as brown spot and codling moth may appear in summer and autumn. To control these, a 150–200 times dilution of Bordeaux mixture or 65% dexamethasone WP diluted 500 times can be applied every 10–15 days. In June, a 90% trichlorfon solution at 1000 times dilution can be used. However, dimethoate and dichlorvos may cause leaf burn, so it’s better to use them sparingly or avoid them altogether.

Roundness Tester

A roundness tester is a measuring tool that uses the rotation axis method to measure the roundness error of a workpiece. The roundness tester is divided into sensor rotary and workbench rotary. During measurement, the measured part is installed concentric with the precision shaft system, and the precision shaft is equipped with an inductive length sensor or workbench for precise circular motion. The roundness meter consists of an instrument's sensor, amplifier, filter, and output device. If the instrument is equipped with a computer, the computer is also included in this system.

A roundness tester is a precision instrument used to measure the out-of-roundness of a rotating surface (shaft, hole, or spherical surface) of a component. There are usually two types: small desktop, where the workpiece is mounted on a rotating workbench and the measuring head is mounted on a fixed column; and Large floor mounted, with the workpiece installed on a fixed workbench and the measuring head installed on the rotating spindle. During measurement, the measuring head contacts the workpiece's surface, and the instrument's rotating part (workbench or spindle) rotates for one cycle. Due to the extremely high accuracy of the supporting bearings in the rotating part, the measuring head will generate a high-precision circular trajectory on the measured surface during rotation. The out-of-roundness of the measured surface causes the measuring head to shift and transform into an electrical (or pneumatic) signal. After amplification, it can be automatically recorded on a circular recording paper, and the out-of-roundness of each part can be directly read out for accuracy evaluation and process analysis and widely used in precision bearings, machine tools, and instrument manufacturing industries.

The Roundness Testeradopts a radius measurement method and operates in a rotating manner. The rotation axis system of the roundness meter adopts a high-precision air floating spindle as the measurement reference; The electrical part of the roundness tester is composed of advanced computers, precision circular grating sensors, and precision inductance displacement sensors. The circular grating sensors and precision inductance displacement sensors measure angle and radial displacement, ensuring the accuracy of measuring the angular displacement and radial value of the workpiece; The roundness meter measurement software adopts a roundness measurement software based on the Chinese version of WinXP operating system platform, completing data collection, processing, and measurement data management.

China Roundness Measuring Instrument,Roundness Tester Machine,Mitutoyo Roundness Tester Manufacturer

Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com