Detection device for measuring bolt over-yield tightening elongation

Abstract

The utility model provides a detection device for measuring bolt over-yield tightening elongation, which comprises a bottom plate, a V-shaped block and a gauge stand, the V-shaped block is arranged on the left side of the upper end of the bottom plate, the upper end of the V-shaped block is provided with a V-shaped groove, a measured bolt is arranged in the V-shaped groove, and the gauge stand is arranged on the right side of the upper end of the bottom plate through a plurality of second bolts. A measuring head is movably inserted in the upper end of the left side of the gauge stand, a key groove is formed in the upper end of the measuring head, a screw is screwed to the left side of the upper end of the gauge stand through threads, and the threaded end of the screw is located in the middle of the interior of the key groove. According to the utility model, the V-shaped block and the end face are used to position the measured bolt, the measuring mechanism composed of the dial indicator, the spring and the measuring head is used to measure the length of the bolt before and after screwing, the overall structure is simple, the manufacturing and maintenance cost is low, the measuring precision is high, and the popularization value is large.

Description

Technical Field

[0001] The utility model relates to a detection device for measuring the over-yield tightening elongation of a bolt, belonging to the technical field of bolt detection equipment. Background Art

[0002] The bolt tightening process is a very complicated process. The relative rotation of the thread causes the bolt to be gradually stretched, the connected parts to be gradually compressed, and the two connected workpieces are finally firmly connected into a whole. As the thread rotation angle continues to increase, the elongation of the bolt, the axial force of the bolt, the equivalent stress of the bolt, and the tightening torque of the bolt also continue to increase. There is one way to tighten the bolt, which is to reach the specified torque. At this time, the tightening state of the bolt is a linear elastic state; the second is a fixed angle, which is to add an angle after the fixed torque. At this time, the tightening state of the bolt is an over-yielding nonlinear plastic state. Angle-controlled over-yielding tightening method. During the tightening stage of the bolt, the bolt has undergone a certain degree of plastic deformation, but there is still sufficient safety margin before the bolt breaks. Therefore, the prior art uses a vernier caliper to measure the length before and after tightening to obtain the elongation.

[0003] However, when using a vernier caliper to measure the length of the bolt before and after tightening to obtain the elongation, the operator's skills are required to be high. When the caliper is skewed, the reading will produce a gross error, affecting the measurement accuracy of the vernier caliper, and the efficiency of multiple measurements is low. Now, a detection device for measuring the over-yield tightening elongation of the bolt is urgently needed to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a detection device for measuring the over-yield tightening elongation of a bolt, so as to solve the problems raised in the above-mentioned background technology. The utility model has a simple structure, low manufacturing and maintenance costs, high measurement accuracy, and great promotion value.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a detection device for measuring the over-yield tightening elongation of a bolt, comprising a base plate, a V-block and a base, a V-block is arranged on the left side of the upper end of the base plate, a V-groove is opened on the upper end of the V-block, a bolt to be measured is arranged in the V-groove, the base is installed on the right side of the upper end of the base plate through a plurality of second bolts, a measuring head is movably inserted on the upper left end of the base, a keyway is opened on the upper end of the measuring head, a screw is screwed on the left side of the upper end of the base through a thread, and the threaded end of the screw is located in the middle of the keyway, a dial indicator fixing sleeve is installed on the right end of the base, a dial indicator is installed on the right end of the dial indicator fixing sleeve, the dial indicator fixing sleeve is located on the right side of the measuring head, and a spring is arranged between the dial indicator fixing sleeve and the measuring head.

[0006] Furthermore, support blocks are installed around the lower end of the base plate.

[0007] Furthermore, a positioning key is fixed at the connection between the V-shaped block and the bottom plate, and a first bolt is penetrated through the positioning key.

[0008] Furthermore, the head of the bolt to be measured is in contact with the left end surface of the V-block.

[0009] Furthermore, the table seat is located on the right side of the V-shaped block.

[0010] Furthermore, the left end of the measuring head is in contact with the right end surface of the bolt to be measured.

[0011] The beneficial effects of the utility model: the utility model is a detection device for measuring the over-yield tightening elongation of a bolt. Since the utility model adds a V-block, a table base, a measuring head, a keyway screw, a spring, a dial indicator fixing sleeve and a dial indicator, our design improvement and actual use have shown that the device uses the V-block and the end surface to position the bolt to be measured, and then uses the measuring mechanism composed of a dial indicator, a spring and a measuring head to measure the length of the bolt to be measured before and after tightening. The overall structure is simple, the manufacturing and maintenance costs are low, the measuring accuracy is high, and it has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0013] Figure 1 It is a front cross-sectional view of a detection device for measuring the over-yield tightening elongation of a bolt according to the utility model;

[0014] Figure 2 It is a top view schematic diagram of a detection device for measuring the over-yield tightening elongation of a bolt according to the utility model;

[0015] Figure 3 It is a left schematic diagram of a detection device for measuring the over-yield tightening elongation of a bolt according to the utility model;

[0016] In the figure: 1-base plate, 2-positioning key, 3-first bolt, 4-V-block, 41-V-groove, 5-diameter base, 6-second bolt, 7-measured bolt, 8-measuring head, 81-keyway, 9-screw, 10-spring, 11-dial indicator fixing sleeve, 12-dial indicator. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0018] See also Figure 1-Figure 3The utility model provides a technical solution: a detection device for measuring the over-yield tightening elongation of a bolt, comprising a base plate 1, a V-shaped block 4 and a gauge base 5, a V-shaped block 4 is arranged on the left side of the upper end of the base plate 1, a V-shaped groove 41 is opened on the upper end of the V-shaped block 4, a bolt 7 to be measured is arranged in the V-shaped groove 41, the gauge base 5 is installed on the right side of the upper end of the base plate 1 through a plurality of second bolts 6, a measuring head 8 is movably inserted on the upper left end of the gauge base 5, a key groove 81 is opened on the upper end of the measuring head 8, a screw 9 is screwed on the left side of the upper end of the gauge base 5 through a thread, and the threaded end of the screw 9 is located in the middle of the key groove 81, a dial indicator fixing sleeve 11 is installed on the right end of the inside of the gauge base 5, a dial indicator 12 is installed on the right end of the dial indicator fixing sleeve 11, the dial indicator fixing sleeve 11 is located on the right side of the measuring head 8, and a spring 10 is arranged between the dial indicator fixing sleeve 11 and the measuring head 8.

[0019] As the first embodiment of the utility model: support blocks are installed around the lower end of the base plate 1, and a positioning key 2 is fixed at the connection between the V-shaped block 4 and the base plate 1. The positioning key 2 is penetrated by the first bolt 3. The added positioning key 2 and the first bolt 3 facilitate the positioning and installation of the V-shaped block 4. The head of the measured bolt 7 is in contact with the left end face of the V-shaped block 4, and the meter seat 5 is located on the right side of the V-shaped block 4. The added meter seat 5 facilitates the installation of the dial indicator fixing sleeve 11 and the dial indicator 12. The left end of the measuring head 8 is in contact with the right end face of the measured bolt 7.

[0020] As the second embodiment of the utility model: In this device, a gap is left between the head cylinder of the screw 9 and the two sides of the keyway 81 of the measuring head 8, which plays a role in preventing the measuring head 8 from rotating and limiting. In actual operation, the threaded column end of the untightened bolt 7 to be measured is brought into contact with the V-groove 41, and the end face of the bolt head of the bolt 7 to be measured is brought into contact with the end face of the V-block 4. The other end face of the bolt 7 to be measured compresses the measuring head 8 to overcome the elastic force of the spring 10, so that the dial indicator 12 displays a certain reading, and then the reading of the dial indicator 12 is cleared to zero, and the bolt 7 to be measured is Remove it and retighten it on the workpiece in an angle-controlled over-yield tightening manner, then disassemble it and put it back on the V-block 4, so that the threaded column end of the measured bolt 7 contacts the V-groove 41, and at the same time, the end face of the bolt head of the measured bolt 7 contacts the end face of the V-block 4. The end face of the measured bolt 7 compresses the measuring head 8 to overcome the elastic force of the spring 10, so that the dial indicator 12 displays a certain reading. Due to the over-yield tightening, the measured bolt 7 is elongated. At this time, the difference between the reading of the dial indicator 12 and the zero position is the plastic deformation elongation of the measured bolt 7 after yielding.

[0021] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0022] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A detection device for measuring the over-yield tightening elongation of a bolt, comprising a base plate (1), a V-shaped block (4) and a gauge base (5), Features: A V-shaped block (4) is arranged on the left side of the upper end of the bottom plate (1), a V-shaped groove (41) is opened on the upper end of the V-shaped block (4), and a bolt (7) to be measured is arranged in the V-shaped groove (41); The meter base (5) is mounted on the right side of the upper end of the base plate (1) by means of a plurality of second bolts (6); a measuring head (8) is movably inserted at the upper left end of the meter base (5); a keyway (81) is provided at the upper end of the measuring head (8); a screw (9) is screwed on the left side of the upper end of the meter base (5) by means of a thread, and the threaded end of the screw (9) is located in the middle of the keyway (81); a dial indicator fixing sleeve (11) is installed at the right end of the meter base (5); a dial indicator (12) is installed at the right end of the dial indicator fixing sleeve (11); the dial indicator fixing sleeve (11) is located on the right side of the measuring head (8), and a spring (10) is provided between the dial indicator fixing sleeve (11) and the measuring head (8).

2. A detection device for measuring the over-yield tightening elongation of a bolt according to claim 1, Features: Support blocks are installed around the lower end of the base plate (1).

3. A detection device for measuring the over-yield tightening elongation of a bolt according to claim 1, Features: A positioning key (2) is fixed at the connection between the V-shaped block (4) and the bottom plate (1), and a first bolt (3) is provided through the positioning key (2).

4. A detection device for measuring the over-yield tightening elongation of a bolt according to claim 1, Features: The head of the bolt (7) to be measured is in contact with the left end surface of the V-shaped block (4).

5. A detection device for measuring the over-yield tightening elongation of a bolt according to claim 1, Features: The meter base (5) is located on the right side of the V-shaped block (4).

6. A detection device for measuring the over-yield tightening elongation of a bolt according to claim 1, Features: The left end of the measuring head (8) is in contact with the right end surface of the bolt (7) to be measured.

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