CN107976139A - For detecting the instrument of peel rolled straight thread steel bar end quality - Google Patents

Description

A tool for testing the quality of the ends of stripped ribs and rolled straight threaded steel bars

technical field

The invention belongs to the field of steel bar quality testing tools, and in particular relates to a tool for testing the quality of the end of rib stripping and rolling straight thread steel bars.

Background technique

At present, according to the existing specifications, mechanical connections (straight thread connections) can be used for steel bars with a diameter greater than 16mm. Most of the existing housing construction projects basically use mechanical connections for steel bars because of their energy saving, material saving, stable quality, and construction adaptability. Strong features are developed rapidly. Whether the quality of the straight thread thread mouth processing is qualified or not directly affects the quality of the building. The quality of straight thread production is mainly reflected in whether the two data of the number of threads and the length of the thread head are qualified. The traditional method of controlling the quality of straight threads on site is to use straight thread go-no-go gauges, and to observe whether the flat ends are flat. , the number of threaded buttons is still manually counted, and the length of the thread head is still measured on-site with a steel tape. There is no standard to measure whether the end of the tapered thread steel bar is flat by visual inspection. At the same time, the visual inspection results of different people are also very different, and there is no practical reference value. Use manual counting one by one to determine the number of threads. Use a tape measure to measure the length of the straight thread head to determine the number of threads. These two methods are not only inefficient, but also have large errors. It takes a long time and cannot achieve the purpose of accurately controlling the quality of the straight thread.

Because at present, the latest JG/T163-2013 standard for sleeves used in the national construction industry for connecting steel bars only provides the minimum size table for mechanically connecting sleeves for steel bars, but does not specify the inner diameter of straight threaded sleeves for steel bar connections. Therefore, each steel bar connection The steel thread go-no-go gauge provided by the sleeve manufacturer is matched according to the thread parameters of the manufacturer. In other words, let the manufacturer provide matching thread go-no-go gauges whichever steel connection sleeve you buy. Therefore, the use of go-no-go gauges to detect whether the thread quality is qualified is very limited, and the measurement time is long and the efficiency is low.

Contents of the invention

The object of the present invention is to provide a tool that can simply, conveniently and accurately complete the quality inspection of the ends of steel bars.

The tool for detecting the quality of the end of the rib-stripping and rolled straight-thread steel bar provided by the present invention includes a detection sleeve that can be placed outside the end of the steel bar. One end of the detection sleeve is a closed end, the other end is an open end, and the closed end is There is a depth-measuring part that can reciprocate along its axial direction, and a qualified viewport is arranged on the wall of the detection sleeve along the axial direction. The minimum length required, the inner diameter of the test sleeve is equal to the maximum outer diameter specified by the end of the steel bar to be tested.

In a specific embodiment, the detection sleeve is a cylindrical sleeve with an open end, a through hole is provided at the closed end for the passage of the depth-measuring piece, and a gantry is provided outside the closed end, and the depth-measuring piece is connected to Parallel to the axial centerline of the detection sleeve on the gantry.

Preferably, the depth-measuring member is a round rod with a scale, the top end of which is connected to the portal frame through a spring, and the bottom end is a conical head, and the apex of the conical head is located on the axial centerline of the detection sleeve .

In order to improve the stability of use, a transparent sleeve is provided between the door frame and the closed end of the detection sleeve, the spring is located in the transparent sleeve, one end of the spring is fixedly connected to the bottom surface of the door frame, and the other end is connected to the bottom surface of the door frame. The depth-measuring elements are connected.

In a specific embodiment, there are two gantry frames arranged criss-cross in a cross shape, and there are five depth-measuring parts, one of which is set on the axial centerline of the detection sleeve, and the remaining four The two depth-measuring parts are arranged in an annular array with respect to the center, and the radius of the annular array is smaller than the inner diameter of the concave part at the end of the steel bar to be measured.

As preferably, the qualified viewing port is an arc-shaped mouth opened along the circumferential direction of the detection sleeve, and the distance between the inner end of the arc-shaped mouth in the axial direction and the inner surface of the closed end of the detection sleeve is equal to the distance between the straight thread of the steel bar end. The minimum allowable length, the distance between the outer end of the arc opening and the inner surface of the closed end of the detection sleeve is equal to the maximum allowable length of the straight thread at the end of the steel bar.

For the convenience of observation, an unqualified viewport is also provided on the side wall of the detection sleeve. The unqualified viewport communicates with the qualified viewport and is located at the inner end of the qualified viewport. The arc length of the qualified viewport is greater than that of the unqualified viewport. The arc length, the coloring layers of different colors are respectively arranged on the outside of the entities corresponding to the positions of the qualified viewport and the unqualified viewport on the side wall of the detection sleeve.

In order to further facilitate observation, the arc length of the qualified viewport is greater than the arc length of the unqualified viewport, and the coloring of different colors is provided on the body of the corresponding qualified viewport and unqualified viewport positions on the side wall of the detection sleeve. Floor.

In a specific embodiment, an arc-shaped opening for observing the flatness of the end of the steel bar is provided on the side wall of the detection sleeve.

When the present invention is used, the detection sleeve is placed on the end of the steel bar. If it cannot be inserted, the outer diameter of the end of the steel bar is unqualified. After being inserted, it is measured by the depth-measuring device arranged at the closed end of the detection sleeve and the reciprocating movement of the depth-sounding device. The depth of the concave at the end of the steel bar; on the other hand, through the qualified viewport set on the sleeve wall, put the detection sleeve on the end to observe the position of the end of the straight thread, and if it falls into the qualified viewport, it is unqualified; otherwise, it is unqualified; It is simple and convenient to complete the inspection of whether the number of threads at the end of the steel bar is qualified, and can quickly complete the inspection of the concavity of the end of the steel bar.

Description of drawings

Fig. 1 is a schematic front view of a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of a usage state of this implementation.

Graphic serial number:

1—test set, 11—qualified viewport, 12—unqualified viewport, 13—arc mouth, 14—green coloring layer, 15—red coloring layer;

2—gantry frame;

3—deep sounding piece;

4—spring;

5—transparent cover;

6—Φ22 straight threaded steel bar.

Detailed ways

As shown in FIG. 1 , the tool provided in this embodiment for testing the quality of the end of stripped and rolled straight threaded steel bars includes a testing sleeve 1 , a portal frame 2 and a depth-measuring piece 3 .

The detection sleeve 1 is a cylindrical sleeve with one end closed and one end open. The inner diameter of the detection sleeve is equal to the maximum outer diameter allowed by the steel bar. Put the detection sleeve on the end of the steel bar. If it cannot be inserted, the outer diameter of the end of the steel bar is unqualified; A qualified viewport 11 and an unqualified viewport 12 are sequentially arranged on the wall from the opening end inwardly in the axial direction. Both viewports are arc-shaped ports. It constitutes a two-stage arc-shaped stepped mouth. The distance between the interface between the qualified viewport and the unqualified viewport and the inner surface of the closed end of the detection sleeve is equal to the minimum length allowed by the straight thread at the end of the steel bar. The outer end surface of the qualified viewport and the detection sleeve The distance between the inner surfaces of the closed end of the sleeve is equal to the maximum length allowed by the straight thread at the end of the steel bar; thus, it is only necessary to put the detection sleeve on the end of the steel bar, and the straight thread thread can be judged according to which viewport the end of the straight thread falls in. Whether the number is qualified; in actual use, a green coloring layer 14 is coated on the outside of the entity corresponding to the qualified viewport position on the side wall of the detection sleeve, and a red coloring layer 15 is coated on the outside of the entity corresponding to the unqualified viewport position; so that it can be changed Directly and clearly observe whether the number of threads of the straight thread meets the requirements. In addition, an arc-shaped opening 13 is provided on the side wall of the detection sleeve 1 close to the closed end so as to observe the flatness of the end of the steel bar. A gantry 2 is provided outside the closed end of the detection sleeve 1 , and a through hole for the depth-measuring member 3 to pass is provided on the end plate of the closed end of the detection sleeve 1 .

The depth-measuring part 3 is a round bar with a scale engraved on the outer wall, and the length of the round bar extending into the detection sleeve is greater than the maximum allowable value of the concave depth at the end of the steel bar. The bottom end of the depth-measuring piece is a conical head, and the conical head extends into the detection sleeve. There are transparent sleeves 5 to improve the stability of movement during use. When it is used to measure the concave depth of the end of the steel bar, the detection sleeve is placed on the end of the steel bar until the closed end of the detection sleeve is in contact with the outer edge of the end of the steel bar. In this process, the compression spring of the sounding part retreats to a stable position. After the stabilization, read the reading of the sounding part at the closed end of the detection sleeve. The reading minus the plate thickness of the closed end is the concave of the end of the steel bar. depth.

At the same time, in order to better detect the flatness of the end of the steel bar, two portal frames 2 can be arranged in a cross shape, and five depth-measuring parts and their supporting components can be designed, one of which is arranged in the axial direction of the detection sleeve. On the center line, the other four depth-measuring parts are arranged in a circular array with respect to the center. The radius of the circular array is smaller than the inner diameter of the inner concave part of the end of the steel bar to be measured. By comparing the different readings of the five sounding parts, the end of the steel bar can be obtained. flatness.

As shown in Figure 2, when it is used to detect whether the number of bolt threads is qualified, it is used to detect Φ22 straight threaded steel bars 6 as an example. In actual production, since the rib diameter of Φ22 straight threaded steel bars is 20.8±0.2, so The inner diameter of the detection sleeve is 21mm. If the straight threaded steel bar cannot be inserted into the testing tool during the on-site test, it means that the stripped rib diameter of the straight threaded steel bar is unqualified. According to industry regulations, the standard pitch of Φ22 straight threaded steel bars is 2.5mm, the number of complete threads is 11, the standard thread head length is 27.5mm, and the actual on-site allowable thread quantity error is ±2. That is, it is necessary to delineate the interface between the qualified viewport and the unqualified viewport based on the number of 9 threads and the length of the thread head of 22.5mm. Mark the red area on the left side of the 22.5mm error line. If the end of the straight thread screw is in the red area, the quality of the straight thread steel bar is unqualified. The area between 22.5mm-27.5mm is marked as the green area. If the end of the straight thread screw is in green In the area, the quality of the straight thread steel bar is qualified. Using these two areas, you can quickly see whether the number of straight thread steel thread fasteners is qualified or not. And the concave depth of the end of the steel bar can be measured by the depth-measuring device at the position of the central axis, and the flatness of the end of the steel bar can also be judged by comparing the different depths measured by the five depth-measuring devices.

It can be seen that when the present invention is in use, firstly, the detection sleeve is placed on the end of the steel bar. If it cannot be inserted, the outer diameter of the end of the steel bar is unqualified. Depth, can quickly complete the detection of the concavity of the end of the steel bar, and can judge the flatness of the end of the steel bar through the comparison of the depth measured at different positions; It can easily and conveniently complete the inspection of whether the number of threads at the end of the steel bar is qualified. The accuracy and convenience of detection are greatly improved, and the detection efficiency is improved.

Claims (8)

1. A tool for detecting the quality of the end of a stripped rib rolling straight thread steel bar, characterized in that: it includes a detection sleeve, one end of the detection sleeve is a closed end, and the other end is an open end, and the closed end is provided with a For the reciprocating sounding parts, there is a qualified viewport on the wall of the detection sleeve. The minimum distance between the qualified viewport and the closed end of the detection sleeve is the minimum length required for the straight thread at the end of the steel bar in the industry. The inner diameter of the detection sleeve is It is equal to the maximum outer diameter specified by the end of the steel bar to be tested. 2. The tool for detecting the quality of the rib-stripping and rolling straight thread steel bar end according to claim 1, characterized in that: the detection sleeve is a cylindrical sleeve with one end open, and its closed end is provided with a The through hole through which the deep part passes is provided with a gantry outside the closed end, and the depth-measuring part is connected to the gantry parallel to the axial center line of the detection sleeve. 3. The tool for detecting the quality of the ends of rib-stripping and rolling straight-thread steel bars according to claim 2, wherein the depth-measuring member is a round rod with a scale, and its top end is connected to the door by a spring. The frame is connected, the bottom end is a conical head, and the apex of the conical head is located on the axial center line of the detection sleeve. 4. The tool for detecting the quality of the end of the rib-stripping and rolling straight-threaded steel bar according to claim 3, wherein a transparent sleeve is provided between the portal frame and the closed end of the detection sleeve, and the The spring is located in the transparent sleeve, one end of the spring is fixedly connected to the bottom surface of the gantry frame, and the other end is connected to the depth-measuring member. 5. The tool for detecting the quality of the ends of rib-stripping and rolling straight-threaded steel bars according to claim 2 or 4, characterized in that: there are two gantry frames arranged in a criss-cross pattern, and the measuring There are five deep parts, one of which is arranged on the axial center line of the detection sleeve, and the other four are arranged in a circular array with respect to the central depth-measuring part, and the radius of the circular array is smaller than the inner diameter of the inner concave part of the end of the steel bar to be measured. 6. The tool for detecting the quality of the rib-stripping and rolling straight-thread steel bar end according to claim 1, wherein the qualified viewport is an arc-shaped opening opened along the circumferential direction of the detection sleeve, along the shaft The distance between the inner end of the arc-shaped mouth and the inner surface of the closed end of the detection sleeve is equal to the minimum length allowed by the straight thread of the steel bar end, and the distance between the outer end of the arc-shaped mouth and the inner surface of the closed end of the detection sleeve is equal to the steel bar end. The maximum length allowed for straight threads. 7. The tool for detecting the quality of rib stripping and rolling straight thread steel bar ends according to claim 1, characterized in that: the side wall of the detection sleeve is also provided with an unqualified view port, and the unqualified view port is the same as the qualified one. The viewports are connected and located at the inner end of the qualified viewports, the arc length of the qualified viewports is greater than the arc length of the unqualified viewports; There are colored layers of different colors. 8. The tool for detecting the quality of the end of the rib stripped and rolled straight thread steel bar according to claim 1, characterized in that: the side wall of the detection sleeve is provided with an arc-shaped mouth for observing the flatness of the end of the steel bar .