CN205175603U - It is fixed device and stud shaft power is measured device for stud shaft power is measured - Google Patents

Abstract

The utility model relates to the field of measuring devices, and discloses a fixing device for measuring bolt axial force and a bolt axial force measuring device. The fixing device for measuring bolt axial force includes a screw head fixing part (21) and a screw rod fixing part ( 22), the screw head fixing part (21) includes a screw head connecting part (211) and a first clip connecting part (212), and the screw fixing part (22) includes a screw fitting part and a second clip connecting part (222). The fixing device provided by the utility model can fix the screw head and the screw rod of the bolt. When the fixing device is stretched by a measuring device such as a stretching machine, the tension effect of the bolt during the bolt assembly process can be simulated. The newly provided fixing device, tensioning machine and other devices can complete the measurement of the axial force of the bolt, thereby reducing the cost required for measuring the axial force of the bolt.

Description

Fixing device for bolt axial force measurement and bolt axial force measuring device

technical field

The utility model relates to the field of measuring devices, in particular to a fixing device for bolt axial force measurement used for fixing bolts in the process of bolt axial force measurement and a bolt axial force measuring device comprising the fixing device.

Background technique

The bolt axial force is the elastic force generated in the elastic range of the bolt when the nut is tightened so that the bolt is screwed into the threaded hole according to the thread. The bolt axial force is an important parameter to ensure the reliable connection and normal operation of the parts, so the study of bolts requires the study of bolt The relationship between the amount of elastic deformation during tension and the axial force provided by the bolt. At present, there is a special bolt axial force measuring instrument, but it is very expensive, and generally only special bolt manufacturers can have it, and most machinery-related factories do not need to measure the bolt axial force frequently, so purchasing a bolt axial force measuring instrument leads to Cost burden, but sometimes it is necessary to measure the bolt axial force in actual work.

Therefore, there is a need in the art to provide a low-cost bolt axial force measuring device.

Utility model content

The purpose of this utility model is to provide a fixing device for bolt axial force measurement, the fixing device for bolt axial force measurement can fix the screw head and screw rod of the bolt, when the fixing device is stretched by a measuring device such as a stretching machine , to be able to simulate the tension effect of the bolt during the bolt assembly process, thereby reducing the cost required to measure the bolt axial force.

The purpose of the utility model is to provide a bolt axial force measuring device, which can measure bolt axial force by measuring parameters such as bolt tension and deformation, and the bolt axial force measuring device is low in cost.

In order to achieve the above object, the utility model provides a fixing device for bolt axial force measurement, wherein the fixing device includes a screw head fixing part and a screw rod fixing part, and the screw head fixing part includes a screw head connecting part and a first The clip connection part, the screw fixing part includes a screw fitting part and a second clip connection part.

Preferably, an accessible accommodating cavity is formed on the screw head connection part, and an installation hole communicating with the accommodating cavity is opened on the bottom wall of the screw head connection part.

Preferably, an opening communicating with the accommodating cavity is formed on the side wall of the screw head connection part, and the installation hole extends toward the side wall of the screw head connection part and communicates with the opening.

Preferably, the screw fitting portion includes an internally threaded hole formed on the screw fixing member.

Preferably, external threads are formed on the outer surfaces of the first clamp connection part and the second clamp connection part.

Preferably, the screw head connection part is detachably connected to the first clip connection part.

The utility model further provides a bolt axial force measuring device, wherein the bolt axial force measuring device includes a stretching machine and a fixing device for bolt axial force measurement provided by the utility model, and the stretching machine includes two A clip, the two clips are respectively capable of clamping the first clip connection portion of the screw head fastener and the second clip connection portion of the screw fastener.

Preferably, the bolt axial force measuring device further includes a bolt length measuring device.

Preferably, the bolt length measuring device is an ultrasonic sensor.

Preferably, the bolt length measuring device is arranged in the accommodating cavity.

Through the above technical solution, the fixing device provided by the utility model can fix the screw head and the screw rod of the bolt. When the fixing device is stretched by a measuring device such as a stretching machine, the tension effect of the bolt during the bolt assembly process can be simulated. Therefore, The measurement of the axial force of the bolt can be completed through the simple fixing device and the tensioning machine provided by the utility model, without using special equipment, and the cost required for measuring the axial force of the bolt is reduced.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a schematic diagram of the assembly between the fixing device for bolt axial force measurement provided by the utility model and the bolt and the fixture of the tensioning machine.

Fig. 2 is a schematic diagram of the assembly between the fixing device for bolt axial force measurement provided by the utility model and the bolt.

Fig. 3 is a structural schematic diagram of the screw head fixing part of the fixing device for bolt axial force measurement provided by the utility model.

Fig. 4 is a schematic structural view of the screw fixing part of the fixing device for bolt axial force measurement provided by the present invention.

Explanation of reference signs

1 fixture 21 screw head fixing parts

211 screw head connection part 212 first fixture connection part

213 Mounting hole 214 Accommodating cavity

22 screw fixing part 221 internal threaded hole

222 The second clamp connection part 31 screw head

32 screw 4 ultrasonic sensor

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

Hereinafter, the fixing device for bolt axial force measurement provided by the present invention and the bolt axial force measuring device including the fixing device will be described in detail with reference to FIGS. 1 to 4 .

The utility model provides a fixing device for bolt axial force measurement, the fixing device includes a screw head fixing part 21 and a screw rod fixing part 22, wherein the screw head fixing part 21 includes a screw head connecting part 211 connected with a first fixture part 212 , the screw fixing part 22 includes a screw fitting part and a second clip connecting part 222 . Briefly explain the process of using the fixing device for bolt axial force measurement, the screw head 31 of the bolt is connected to the screw head connection part 211, the screw rod 32 of the bolt is connected to the screw rod matching part of the screw rod connection part, and then the tensioning machine is used to Measuring devices such as clamping the first fixture connecting part 212 and the second fixture connecting part 222, and stretching in opposite directions along the axis of the screw head 31 and the screw rod 32, at this time, measuring devices such as a stretching machine can measure the bolt Parameter values related to bolt axial force, such as tensile force, deformation, bolt length, etc. during the stretching process. As for the specific shape and size of the screw head fixing part 21 and the screw rod fixing part 22, the present invention does not limit it.

Preferably, the axis of the first clip connection portion 212 of the screw head fixture 21 and the axis of the second clip connection portion 222 of the screw fixture 22 are collinear with the axis of the bolt provided on the fixture, so that Ensure that the force acts along the axis of the bolt when the tensioning machine performs the tensioning operation on the bolt through the fixture.

The fixing device provided by the utility model can fix the screw head 31 and the screw rod 32 of the bolt. When the fixing device is stretched by a measuring device such as a stretching machine, the tension effect of the bolt in the bolt assembly process can be simulated. Therefore, by simple The fixing device, the stretching machine and other devices provided by the utility model can complete the measurement of the axial force of the bolt, thereby reducing the cost required for measuring the axial force of the bolt.

As a preferred embodiment, referring to Fig. 2 and Fig. 3, in the fixing device of the present utility model, an accessible accommodation chamber 214 is formed on the screw head connecting portion 211, and an accommodating chamber 214 is formed on the bottom wall of the screw head connecting portion 211. The cavity 214 communicates with the mounting hole 213 . Before carrying out the stretching operation, the bolt is inserted into the mounting hole 213 through the accessible accommodating chamber 214. In this process, the screw rod 32 of the bolt is passed through the mounting hole 213, and the screw head 31 of the bolt is not passed through the mounting hole 213 and is stuck in the mounting hole 213. Inside the chamber 214. In order to make the screw head 31 of the bolt clamp on the screw head connecting portion 211 only by the size of the mounting hole 214, the size of the mounting hole 213 is preferably larger than the diameter of the screw rod 32 of the bolt and smaller than the minimum diameter of the screw head 31, but The present invention is not limited thereto, and structures such as gaskets can also be used to assist the screw head 31 of the bolt to be clamped in the accommodation cavity 214 of the screw head connecting portion 211 .

Further, in order to quickly install the bolt on the fixing device provided by the utility model, as a preferred embodiment, referring to FIG. The hole 213 extends toward the sidewall of the screw head connection portion 211 and communicates with the opening. Under this structure, the bolt can be directly inserted into the installation hole 213 from the side wall of the screw head connection portion 211 , and the operation of inserting the bolt is very simple and fast.

The utility model provides a preferred embodiment of a fixing device for bolt axial force measurement. Referring to FIGS. The two opposite openings are provided with a mounting hole 213 on the bottom wall of the screw head connecting portion 211, and the mounting hole 213 extends to the side wall of the screw head connecting portion 211 and communicates with one of the two openings, that is to say, Only one side of the mounting hole 213 is open, and the other side is closed by the bottom wall of the screw head connection portion 211 . In addition, the first clamp connection part 212 and the second clamp connection part 222 are cylindrical, and in order to improve the static friction during the stretching process between the clamps of the stretching machine and the fixing device provided by the utility model to prevent mutual falling off , external threads may be formed on the outer surfaces of the first clip connecting portion 212 and the second clip connecting portion 222 , but the manner of increasing the static friction force is not limited thereto.

In addition, referring to FIG. 4 , the screw fitting portion can be an internally threaded hole 221 formed on the screw fixing member 22 to be threadedly connected with the screw 32 of the bolt, so that the screw fitting portion and the screw 32 can be reliably fixed.

In addition, preferably, the screw head connecting portion 211 and the first fixture connecting portion 212 are detachably connected, and when the screw head connecting portion 211 or the first clamp connecting portion 212 are damaged or different types or sizes of tensioning tools or bolts are used, the screw head connecting portion 211 or the bolt can be replaced separately. The first clamp connection part 212 . As a specific implementation, an opening is provided on the upper wall of the screw head connection part 211, and an internal thread is provided on the opening. At this time, one opening can be used as a passage for the bolt to enter the accommodating cavity 214, and can also be used as a A connecting structure for connecting with the first clip connecting portion 212 .

The utility model further provides a bolt axial force measuring device, the bolt axial force measuring device includes a stretching machine and a fixing device for bolt axial force measurement provided by the utility model, the stretching machine includes two fixtures 1, two The two clamps 1 can clamp the first clamp connection part 212 of the screw head fastener 21 and the second clamp connection part 222 of the screw fastener 22 respectively.

Hereinafter, the operation process of the bolt axial force measuring device provided by the utility model will be briefly described. First, the screw head 31 of the bolt is connected to the screw head connecting portion 211 of the screw head fixture 21 of the fixing device, and the screw rod 32 of the bolt is connected to the screw fitting part of the screw fixing member 22 of the fixing device, and the bolt and the fixing are completed. After the connection between the devices, the first clamp connection part 212 and the second clamp connection part 222 of the fixing device are respectively clamped by two stretched clamps 1, and the screw head 31 and the screw rod 32 are moved in opposite directions along the axis of the screw head 31 and the screw rod 32. Stretching, at this time, the stretching machine can measure the parameters related to the bolt axial force such as the tension, deformation, and bolt length during the bolt stretching process, so that the bolt axial force can be measured.

The bolt axial force measuring device provided by the utility model can measure the bolt axial force through the simple structure fixing device provided by the utility model of the stretching machine, and the cost is relatively low.

In addition, the accuracy of bolt axial force comes from the accuracy of various parameters related to it, and in order to obtain more accurate bolt axial force, the bolt axial force measuring device of the present invention can also include a bolt length measuring device with good measurement accuracy.

Preferably, the bolt length measuring device is an ultrasonic sensor 4, which is arranged at the center of the top surface of the screw head 31 of the bolt. When the bolt is stretched, the ultrasonic sensor 4 can acquire bolt length data in real time.

In addition, the bolt length measuring device is arranged in the housing cavity 214 of the screw head connection part 211 of the fixing device, so that the bolt length measuring device, especially the ultrasonic sensor 4, can be in contact with the bolt to perform real-time measurement. In addition, the bolt length measuring device is housed The cavity 214 can also be protected by the shell of the screw head connection 211 .

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment, and within the scope of the technical concept of the utility model, the technical solution of the utility model can be carried out in many ways. These simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be explained separately.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (10)

1. A fixture for bolt axial force measurement, characterized in that the fixture comprises a screw fixture (21) and a screw fixture (22), and the screw fixture (21) includes a screw connection part (211) and the first clip connection part (212), and the screw fixing part (22) includes a screw fitting part and a second clip connection part (222). 2. The fixing device for bolt axial force measurement according to claim 1, characterized in that, an accessible accommodating chamber (214) is formed on the screw head connection part (211), and the screw head connection part An installation hole (213) communicating with the accommodating cavity (214) is opened on the bottom wall of (211). 3. The fixing device for bolt axial force measurement according to claim 2, characterized in that, an opening communicating with the accommodating cavity (214) is formed on the side wall of the screw head connection part (211), The installation hole (213) extends to the side wall of the screw head connection part (211) and communicates with the opening. 4. The fixing device for bolt axial force measurement according to claim 2, characterized in that, the screw fitting part comprises an internal threaded hole (221) formed on the screw fixing part (22). 5. The fixing device for bolt axial force measurement according to claim 2, characterized in that, the outer surfaces of the first clamp connection part (212) and the second clamp connection part (222) are Both are formed with external threads. 6 . The fixing device for bolt axial force measurement according to claim 2 , characterized in that, the screw head connection part ( 211 ) and the first clamp connection part ( 212 ) are detachably connected. 7. A bolt axial force measuring device, characterized in that the bolt axial force measuring device comprises a tensioning machine and the fixing device for bolt axial force measurement according to any one of claims 2-6, the The stretching machine includes two clamps (1), and the two clamps (1) can respectively clamp the first clamp connection part (212) and the The second clip connection part (222) of the screw fixing part (22). 8. The bolt axial force measuring device according to claim 7, characterized in that the bolt axial force measuring device further comprises a bolt length measuring device. 9. The bolt axial force measuring device according to claim 8, characterized in that the bolt length measuring device is an ultrasonic sensor (4). 10. The bolt axial force measuring device according to claim 8 or 9, characterized in that, the bolt length measuring device is arranged in the accommodating cavity (214).