Construction engineering quality detector is mainly used for engineering construction, decoration and renovation, bridge construction, equipment installation and other engineering construction and completion of the quality inspection [1-4], construction engineering quality detector detection ability is accurate or not, related to the quality and safety of many construction projects. According to the national JJF1110-2003 "construction engineering quality detector group calibration specification" calibration specification for calibration engineering quality detector calibration project, technical indicators, calibration methods are clearly described, is currently valid statutory measurement calibration specification. But the specification for the calibration device description is too simple, and the device structure design is too idealized, not easy to realize. Therefore, there is an urgent need to calibrate the specification based on the technical requirements of JJF1110-2003, combined with their own work, the development of a set of construction quality detector verticality testing ruler calibration of the value of the error calibration needs of the calibration device, while ensuring the reliability of the calibration value for the quality of the construction project to provide effective measurement of technical assurance.
1 device structure and design principle
The device is mainly based on JJF1110-2003 "construction quality detector calibration specification" technical requirements, as shown in Figure 1. The device mainly includes: the main support, clamping part and measurement part. The main support includes: marble column, marble base and supporting feet; clamping part includes: the inspected ruler fixed sleeve and the device on top of the fixed frame; measurement part includes: digital micro-division head, the top ruler assembly, the table lifting assembly and the micro-division head clamping base. To carry out calibration work, first of all, the upper end of the inspected ruler is fixed in a special sleeve, and then fixed in the sleeve of the inspected ruler together on the fixed frame, so that the inspected ruler in its own by the earth's gravitational force to ensure that the inspected ruler is free to swing in the horizontal direction; adjust the height of the workbench so that the lower end of the inspected ruler is in the number of microscopic subhead and the top of the ruler component of the measurement axis; adjust the number of knobs to make the inspected micro-sub-head of the inspected ruler in the free swing of the indicator gauge pointer adjusted to the state of free swing. Under the state of indication table pointer adjusted to zero, at the same time the number of micro-minute numerical value set to zero, can be based on JJF1110-2003 "construction quality detector calibration specification" calibration of the amount of change in the sign value of the ruler and the sign value error.
1.1 main bracket
As shown in Figure 1, the device main bracket consists of marble column, marble base and support feet three parts, the main bracket marble column on both sides of the surface flatness <0.005mm, can be completed to detect the straightness of the verticality of the calibration of the ruler; bracket holes not only to reduce the weight can also reduce the release of stress after the cut, and ultimately the physical device as shown in Figure 2. The final physical device is shown in Figure 2.
1.2 Clamping part
One of the key technical parts of the device is the clamping part of the inspected ruler, because it is not only to solve the problem of fixing the verticality inspection ruler to ensure that it has no displacement in the front and rear axial direction, but also to meet the engineering ruler to its own plumb line as a reference for the left and right single-direction free swing. We adopted the fixing program shown in Figure 3, the specific physical as shown in Figure 4. As shown in Figure 4, the device is mainly through the upper end of the clamping assembly to fix the verticality testing ruler of the construction engineering quality detector on the top of the column. The upper end clamping assembly consists of the top fixing frame and sleeve, the sleeve has plastic screws, can be fixed in the sleeve, while the top fixing frame has a V-shaped groove, and the sleeve is designed to rotate with the V-shaped groove at both ends of the short shaft, the sleeve and the fixing frame can be mounted together through the V-shaped groove and the axis of the way to match, not only to meet the fixed requirements of the inspected inspection ruler, but also relying on the inspected ruler by the earth's gravitational force to ensure that the inspected ruler in the horizontal direction under the action of the earth. At the same time, relying on the ruler itself by the gravitational force of the earth to ensure that the ruler is free to rotate in the horizontal direction, so that the calibration of the ruler is consistent with the actual use of the state.
1.3 Measuring part
The measuring part includes the digital micrometer head, the top ruler assembly, the worktable lifting assembly and the micrometer head clamp. Calibration, the lower end of the inspected ruler will be between the digital micro-split head and the top ruler assembly, the top ruler assembly is equipped with a spring, can be freely retracted to ensure that the inspected side of the ruler is always close to the digital micro-split head of the probe, and at the same time, can be fixed in the position of the calibration point of the inspected ruler, so that adjusting the displacement of the digital micro-split head of the probe can be changed to be inspected by the amplitude of the swing, so as to read out the displacement value of both, in order to realize the calibration work. Considering the verticality inspection ruler in the upper clamping position and its own length difference may cause the following measurement end can not be exactly in the number of micro-miniature sub-head and the top of the measuring axis of the ruler assembly, so the use of lifting table, can be up and down to adjust the number of micro-miniature sub-head and the top of the measuring axis of the height of the ruler assembly, the schematic diagram and the physical diagram shown in Figure 5 and Figure 6, respectively. As shown in Figure 6, the lifting table adopts synchronous belt to connect the rotating handle and lifting screw, then the positive and negative rotating handle can drive the lifting screw to rotate in the same direction, control the table to move up and down, to realize the digital micro-split head and the top ruler components of the measurement axis height adjustment. The table has a travel distance of 20mm, which is perfectly compatible with the size of construction quality detectors on the market.
2 device function realization and innovation
2.1 clamping part
Through the practical application of the device has been verified that the clamping method can be a good solution to the inspected ruler in the fixed at the same time, but also flexible left and right swing. The innovation of this clamping method is mainly manifested as follows: 1) the use of a sleeve to fix the inspected ruler, easy to pick up and can be directly on the ground flexible loading and unloading of the inspected ruler; 2) the sleeve and the top of the calibrating device fixed frame using the shaft and the V-shaped frame with the way, and the actual use of the ruler in line with the state of the inspected ruler; 3) the size of the fixed sleeve design to meet the requirements of a variety of types of fixed test ruler.
2.2 Measurement Part
Selecting the digital micro-minute head with a resolution of 0.001mm, through a series of stability and repeatability tests, the measurement method can fully realize the calibration of the verticality measuring tape and meet the requirements of its accuracy. The innovation of the measurement part is mainly manifested as follows: 1) the measurement table adopts the lifting structure, so as to ensure that the following measurement end is in the measurement axis of the digital micro-minute head and the top ruler assembly when calibrating; 2) the digital micro-minute head and the top ruler assembly can be moved relative to each other on the working table along the measurement axis, so that the optimal measurement position can be adjusted according to the inspected ruler; 3) the installation position of the digital micro-minute head is not in accordance with the JJF1110-2003 "Construction Engineering Quality Detector", which is the first one of its kind. -2003 "construction quality detector group calibration specification" in the micro head installation design, in the calibration specification, the number of micro head to be installed in the perpendicular direction with the column, and at the same time to go through the column and the top ruler assembly with the measurement, but in the device, the number of micro head and the top ruler assembly is installed in the direction of the marble column parallel to the design of the program not only This design scheme is not only simple and easy to install, at the same time, when calibrating the marble column will not interfere with the free swing of the inspected ruler in the horizontal direction, which is more reasonable from the point of view of use.
2.3 Overall function
Combined with the above analysis, the device's overall function of innovation is mainly manifested in: 1) according to JJF1110-2003 "construction quality detector calibration specification" technical requirements can be completed in the construction quality detector verticality ruler calibration of the error in the value, and the repeatability of the calibration results, Stability is better, the current market can meet the calibration project less apparatus; 2) the device marble column on both sides of the surface flatness <0.005mm, but also can complete the verticality testing ruler straightness calibration work, compared to the use of a large flat plate calibration straightness, more convenient and space-saving.
3 Conclusion
The construction quality detector calibration device can not only meet the JJF1110-2003 "construction quality detector calibration specification" in the technical indicators involved, while making up for the shortcomings of the calibration device in the calibration specification. The device is reasonably designed, easy to use, accurate and fast calibration results, effectively solving the problem of accuracy, stability and repeatability of the calibration work of the construction engineering quality detector, and perfecting the calibration technology of the vertical detection ruler of the construction detector, which is worthy of large-scale popularization and application. The device has applied for a patent, its technical performance indicators advanced, the realization of a unique method, has a good application prospects.
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