Tool for testing the quality of stripped rib rolled straight threaded steel bar ends

Abstract

The present invention discloses a tool for detecting the quality of the end of a rib-stripped rolled straight threaded steel bar. The tool comprises a detection sleeve that can be put on the outside of the steel bar end. One end of the detection sleeve is a closed end and the other end is an open end. The closed end is provided with a depth measuring piece that can reciprocate along its axial direction. A qualified viewport is provided on the wall of the detection sleeve along the axial direction. The spacing between the qualified viewport and the closed end of the detection sleeve is the minimum length allowed by the straight thread of the steel bar end. The inner diameter of the detection sleeve is equal to the maximum outer diameter specified for the steel bar end to be tested. The present invention provides a depth measuring piece at the closed end of the detection sleeve, and measures the depth of the inner concave of the steel bar end by the reciprocating characteristic of the depth measuring piece; provides a qualified viewport on the sleeve wall, and puts the detection sleeve on the end to observe the position of the straight thread termination part. If it falls into the qualified viewport, it is qualified, otherwise it is unqualified; it can simply detect whether the number of threads of the steel bar end is qualified, and can quickly complete the detection of the inner concave degree of the steel bar end.

Description

Technical Field

[0001] The invention belongs to the field of steel bar quality detection tools, and in particular relates to a tool for detecting the quality of rib-stripped rolled straight thread steel bar ends. Background Art

[0002] At present, according to the existing specifications, steel bars with a diameter greater than 16mm can be mechanically connected (straight thread connection). Most of the existing housing construction projects are basically using mechanical connection of steel bars. It has been rapidly developed due to its energy saving, material saving, stable quality, and strong construction adaptability. The quality of straight thread thread processing 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 a straight thread through and through gauge, and observe whether the flat head is flat by visual inspection. The number of threads is still manually counted, and the length of the thread head is still controlled by on-site measurement using a steel tape measure. 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 results of visual inspection by different people are also very different, and there is no practical reference value. Manual counting is used 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 straight threads.

[0003] Because the latest JG / T163-2013 standard for steel bar connection sleeves in the current national construction industry only provides a minimum size table for steel bar mechanical connection sleeves, but does not specify the inner diameter of the steel bar connection straight thread sleeve. Therefore, each steel bar connection sleeve manufacturer provides steel bar thread go and no-go gauges that are matched according to the thread parameters of their own manufacturers. In other words, whichever steel bar connection sleeve is purchased, the manufacturer will provide the matching thread go and no-go gauge. Therefore, the use of go and 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. Summary of the invention

[0004] The purpose of the present invention is to provide a tool that can simply, conveniently and accurately complete the quality inspection of steel bar ends.

[0005] The tool provided by the present invention is for detecting the quality of the end of a rib-stripped rolled straight threaded steel bar, and comprises a detection sleeve that can be sleeved over the end of the steel bar, wherein 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 depth measuring piece that can reciprocate along its axial direction, and a qualified viewport is provided on the wall of the detection sleeve along the axial direction, and the minimum spacing between the qualified viewport and the closed end of the detection sleeve is the minimum length required for the straight thread of the steel bar end in the industry, and the inner diameter of the detection sleeve is equal to the maximum outer diameter specified for the steel bar end to be tested.

[0006] In a specific embodiment, the detection sleeve is a cylindrical sleeve with one end open, and a through hole is provided at the closed end for the depth measuring piece to pass through. A portal frame is provided outside the closed end, and the depth measuring piece is connected to the portal frame and is parallel to the axial center line of the detection sleeve.

[0007] Preferably, the depth measuring piece 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, the apex of which is located on the axial center line of the detection sleeve.

[0008] In order to improve the stability in use, a transparent sleeve is provided between the portal 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 portal frame, and the other end is connected to the depth measuring piece.

[0009] In a specific embodiment, there are two portal frames, which are arranged in a cross shape in a criss-cross pattern. There are five depth measuring pieces, one of which is arranged on the axial center line of the detection sleeve, and the remaining four are arranged in a circular array about the center depth measuring piece. The radius of the circular array is smaller than the inner diameter of the inner recess of the end of the steel bar to be tested.

[0010] Preferably, the qualified viewport is an arc-shaped opening opened along the circumferential direction of the detection sleeve, the spacing between the inner end of the arc-shaped opening along the axial direction 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 spacing between the outer end of the arc-shaped opening and the inner surface of the closed end of the detection sleeve is equal to the maximum length allowed by the straight thread of the steel bar end.

[0011] For the convenience of observation, an unqualified viewport is also provided on the side wall of the detection sleeve. The unqualified viewport is connected 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 the arc length of the unqualified viewport. Colored layers of different colors are respectively provided outside the entities at the positions of the qualified viewport and the unqualified viewport on the side wall of the detection sleeve.

[0012] In order to further facilitate observation, the arc length of the qualified viewport is made greater than the arc length of the unqualified viewport, and the entities on the side wall of the detection sleeve corresponding to the positions of the qualified viewport and the unqualified viewport are provided with colored layers of different colors.

[0013] In a specific embodiment, an arc-shaped opening for observing the flatness of the steel bar end is provided on the side wall of the detection sleeve.

[0014] When the present invention is used, the detection sleeve is put on the end of the steel bar. If it cannot be put in, the outer diameter of the steel bar end is unqualified. After the insertion, a depth measuring piece arranged at the closed end of the detection sleeve is used to measure the depth of the concave of the steel bar end through the reciprocating motion of the depth measuring piece. On the other hand, through the qualified viewport arranged on the sleeve wall, the detection sleeve is put on the end to observe the position of the straight thread termination part. If it falls into the qualified viewport, it is qualified, otherwise it is unqualified. Therefore, it is possible to simply and conveniently complete the detection of whether the number of threads of the steel bar end is qualified, and the detection of the inner concavity of the steel bar end can be quickly completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of a preferred embodiment of the present invention.

[0016] Figure 2 A usage status diagram is provided for this implementation.

[0017] Figure serial number:

[0018] 1—test set, 11—qualified viewport, 12—unqualified viewport, 13—arc-shaped port, 14—green coloring layer, 15—red coloring layer;

[0019] 2—Door frame;

[0020] 3—depth measuring piece;

[0021] 4—spring;

[0022] 5—transparent cover;

[0023] 6—Φ22 straight threaded steel bars. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, the tool for detecting the quality of the end of a rib-stripped rolled straight threaded steel bar provided in this embodiment includes a detection sleeve 1, a portal frame 2 and a depth measuring piece 3.

[0025] The detection sleeve 1 is a cylindrical sleeve with one end closed and the other end open. The inner diameter of the detection sleeve is equal to the maximum outer diameter allowed by the steel bar. The detection sleeve is put on the end of the steel bar. If it cannot be put in, the outer diameter of the steel bar end is unqualified; the side wall of the detection sleeve is axially arranged from the open end inward in sequence with a qualified viewport 11 and an unqualified viewport 12. Both viewports are arc-shaped, and the arc length of the qualified viewport is greater than the arc length of the unqualified viewport. The two constitute a two-level arc-shaped stepped opening. The distance between the boundary surface of the qualified viewport and the unqualified viewport and the inner surface of the closed end of the detection sleeve is equal to the maximum allowable straight thread of the steel bar end. The minimum length of the inspection sleeve, the distance between the outer end face of the qualified viewport and the inner surface of the closed end of the inspection sleeve is equal to the maximum length allowed by the straight thread of the steel bar end; thus, it is only necessary to put the inspection sleeve on the steel bar end, and judge whether the number of straight thread threads is qualified according to which viewport the straight thread termination falls in; in actual use, the entity at the corresponding qualified viewport position on the side wall of the inspection sleeve is coated with a green coloring layer 14, and the entity at the corresponding unqualified viewport position is coated with a red coloring layer 15; so that it is possible to more directly and clearly observe whether the number of straight thread threads meets the requirements. And an arc-shaped opening 13 is provided on the side wall of the inspection sleeve 1 close to the closed end position to facilitate the observation of the flatness of the steel bar end. A portal frame 2 is provided outside the closed end of the inspection sleeve 1, and a through hole for the depth measuring piece 3 to pass through is provided on the closed end plate of the inspection sleeve 1.

[0026] The depth measuring piece 3 is a circular rod with a scale engraved on the outer wall. The length of the circular rod extending into the detection sleeve is greater than the maximum allowable value of the concave depth of the steel bar end. The bottom end of the depth measuring piece is a conical head, which extends into the detection sleeve. The apex of the conical head is located on the axial center line of the detection sleeve; its top end is connected to the door frame 2 through a spring 4, and a transparent sleeve 5 is provided outside the spring to improve the stability of movement during use. When used to measure the depth of the concave of the steel bar end, the detection sleeve is put on the steel bar end until the closed end of the detection sleeve contacts the outer edge of the steel bar end. At this time, the apex of the conical head of the depth measuring piece contacts the center of the concave of the steel bar end. In this process, the depth measuring piece compresses the spring back to stability. After stabilization, the reading of the depth measuring piece at the closed end of the detection sleeve is read. The reading minus the plate thickness of the closed end is the depth of the concave of the steel bar end.

[0027] At the same time, in order to better detect the flatness of the steel bar end, the portal frame 2 can be set to two in a cross-shaped arrangement, and the depth measuring pieces and their supporting components can be designed to be five, one of which is set on the axial center line of the detection sleeve, and the remaining four are arranged in a circular array about the center depth measuring piece. The radius of the circular array is smaller than the inner diameter of the inner recess of the steel bar end to be tested. The flatness of the steel bar end can be obtained by comparing the different readings of the five depth measuring pieces.

[0028] like Figure 2As shown, when used to detect whether the number of bolt threads is qualified, take the detection of Φ22 straight threaded steel bar 6 as an example. In actual production, since the stripping diameter of the Φ22 straight threaded steel bar is 20.8±0.2, the detection sleeve uses the maximum size of 21mm as the inner diameter. If the straight threaded steel bar cannot be inserted into the detection tool during on-site testing, it means that the stripping diameter of the straight threaded steel bar is unqualified. Industry regulations stipulate that the standard pitch of Φ22 straight threaded steel bar is 2.5mm, the number of complete threads is 11, and the standard thread head length is 27.5mm. The actual on-site allowable thread number error is ±2. That is, the interface between the qualified viewport and the unqualified viewport needs to be demarcated by 9 threads and a thread head length of 22.5mm. The left side of the 22.5mm error line is marked as a red area. If the end of the straight thread thread is in the red area, the quality of the straight threaded steel bar is unqualified. The area between 22.5mm-27.5mm is marked as a green area. If the end of the straight thread thread is in the green area, the quality of the straight threaded steel bar is qualified. These two areas can be used to quickly determine whether the number of threads of the straight threaded steel bar is qualified or not. The depth of the concave of the steel bar end can be measured by the depth measuring piece at the center axis position, and the flatness of the steel bar end can be determined by comparing the different depths measured by the five depth measuring pieces.

[0029] It can be seen that when the present invention is used, the detection sleeve is first put on the end of the steel bar. If it cannot be put in, the outer diameter of the steel bar end is unqualified. After the sleeve is put in, on the one hand, the depth of the concave of the steel bar end is measured by the reciprocating motion of the depth measuring piece, which can quickly complete the detection of the concave degree of the steel bar end, and can judge the flatness of the steel bar end by comparing the depths measured at different positions; on the other hand, by setting qualified viewports and unqualified viewports on the sleeve wall, it is simple and convenient to complete the detection of whether the number of threads of the steel bar end is qualified. The accuracy and convenience of the detection are greatly improved, and the detection efficiency is improved.

Claims

1. A tool for detecting the quality of the end of a rib-stripped rolled straight threaded steel bar, characterized in that: It includes a detection sleeve, one end of which is a closed end and the other end is an open end. The closed end is provided with a depth measuring piece capable of reciprocating along its axial direction. A qualified viewport is provided on the wall of the detection sleeve. The minimum spacing between the qualified viewport and the closed end of the detection sleeve is the minimum length required by the industry for the straight thread of the steel bar end. The inner diameter of the detection sleeve is equal to the maximum outer diameter specified for the steel bar end to be tested. The detection sleeve is a cylindrical sleeve with one end open, and a through hole is provided at the closed end for the depth measuring piece to pass through, and a portal frame is provided outside the closed end, and the depth measuring piece is connected to the portal frame and is parallel to the axial center line of the detection sleeve; The depth measuring piece 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, the apex of which is located on the axial center line of the detection sleeve.

2. The tool for detecting the quality of the end of a rib-stripped and rolled straight-threaded steel bar according to claim 1 is characterized in that: A transparent sleeve is arranged between the gate 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 gate frame, and the other end is connected to the depth measuring piece.

3. The tool for detecting the quality of the end of a rib-stripped and rolled straight-threaded steel bar according to claim 2 is characterized in that: There are two portal frames, which are arranged in a cross shape in a criss-cross pattern. There are five depth measuring pieces, one of which is arranged on the axial center line of the detection sleeve, and the remaining four are arranged in a circular array about the center depth measuring piece. The radius of the circular array is smaller than the inner diameter of the inner recess of the end of the steel bar to be tested.

4. The tool for detecting the quality of the end of a rib-stripped and rolled straight-threaded steel bar according to claim 1 is characterized in that: The qualified viewport is an arc-shaped opening opened along the circumferential direction of the detection sleeve. The distance between the inner end of the axial arc-shaped opening 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 opening and the inner surface of the closed end of the detection sleeve is equal to the maximum length allowed by the straight thread of the steel bar end.

5. The tool for detecting the quality of the end of a rib-stripped and rolled straight threaded steel bar according to claim 1, characterized in that: An unqualified viewport is also provided on the side wall of the detection sleeve. The unqualified viewport is connected to the qualified viewport and is located at the inner end of the qualified viewport. The arc length of the qualified viewport is greater than the arc length of the unqualified viewport. Colored layers of different colors are respectively provided outside the entities at the positions of the qualified viewport and the unqualified viewport on the side wall of the detection sleeve.

6. The tool for detecting the quality of the end of a rib-stripped and rolled straight threaded steel bar according to claim 1, characterized in that: An arc-shaped opening for observing the flatness of the steel bar end is arranged on the side wall of the detection sleeve.

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