Magnetic type bolt length measuring device

Abstract

The utility model discloses a magnetic bolt length measuring device, and relates to the technical field of finished bolt guarantee load test auxiliary equipment. Comprising a clamping mechanism, a magnetic attraction mechanism, a working platform, a horizontal adjusting mechanism and a dial indicator height gauge. The clamping mechanism comprises a mechanical arm and a clamping jaw and is used for clamping a bolt to be detected; the magnetic attraction mechanism comprises an electromagnet and a control switch and is used for attracting a to-be-tested bolt; the working platform is used for fixing the clamping mechanism and placing a bolt to be measured and a dial indicator height gauge, and the strong magnetic point and the universal horizontal bubble are embedded on the working platform; the horizontal adjusting mechanism comprises an adjustable foundation bolt and a universal horizontal bubble and is used for adjusting the working platform to be horizontal. And the dial indicator height gauge is arranged on the working platform and is used for measuring the length of the bolt. The device is ingenious in structure and simple to operate, and can quickly fix the bolt to be measured and improve the measurement speed; and the bolt can be effectively prevented from shaking during measurement, and the measurement precision of the bolt length is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for the guaranteed load test of finished bolts, specifically a magnetic bolt length measuring device. Background Technology

[0002] The guaranteed load test for finished fasteners refers to applying a certain load to finished fasteners such as bolts and screws. After unloading, the total length l1 of the fastener should be the same as l0 before loading. Bolt length needs to be measured before and after the guaranteed load test. Because GB / T 3098.1-2010 "Fasteners - Bolts, Screws and Studs" has high accuracy requirements for measuring the length of finished fasteners, with an allowable tolerance of only ±12.5μm, ordinary vernier calipers cannot meet the measurement accuracy requirements. If the bolt is placed vertically and a dial indicator is used to measure its length, bolt wobbling is likely to occur during measurement, thus affecting the accuracy of the measurement. Utility Model Content

[0003] To address the aforementioned technical problems, this invention provides a magnetic bolt length measuring device. It employs a dual method of magnetic attraction and clamping to fix the bolt, and uses a dial indicator and height gauge to accurately measure the finished bolt, ensuring the accuracy of length measurements before and after load testing. This solves the problem of bolt wobbling affecting measurement accuracy when measuring bolt length vertically; it also shortens the time required to measure bolt length before and after load testing, improving measurement efficiency and accuracy.

[0004] The technical solution adopted by this utility model to achieve the above-mentioned objectives is as follows: a magnetic bolt length measuring device, comprising a working platform, a leveling mechanism for adjusting the level of the working platform, and a magnetic attraction mechanism, a clamping mechanism, and a dial indicator height gauge connected to the working platform; the leveling mechanism includes adjustable anchor bolts connected to the four corners of the bottom of the working platform and a universal level bulb embedded in the upper surface of the working platform; the magnetic attraction mechanism is used to attract the bolt to be measured, including a strong magnetic point embedded in the upper surface of the working platform and a magnetic control switch for controlling the presence or absence of magnetic force at the strong magnetic point; the clamping mechanism and the dial indicator height gauge are respectively located on both sides of the strong magnetic point; the clamping mechanism is used to clamp the bolt to be measured, including a robotic arm and a clamping claw; the vertical rod of the robotic arm is connected to one side of the working platform, and an adjustable arm that can be adjusted up and down is connected to the vertical rod; the front end of the adjustable arm is connected to the clamping claw through multiple universal ball joints; the dial indicator height gauge is used to measure the length of the bolt to be measured, including a measuring seat located opposite the clamping claw and a dial indicator connected to the measuring seat.

[0005] The universal ball joint of the robotic arm is connected to the rear end of the gripper, and the orientation of the gripper can be adjusted 360°. The adjustment range of the robotic arm's adjustment arm is 50-300mm. The gripper is a metal crab claw with a threaded adjustable structure and a gripping range of 10-45mm. The clamping part is made of protective rubber to ensure gripping stability and firmness.

[0006] The working platform measures 350mm in length, 250mm in width, and 30mm in thickness.

[0007] The magnetic switch has two positions, corresponding to the presence or absence of magnetic force at the strong magnetic point, ensuring that the bolt under test remains stable and does not wobble.

[0008] This invention features a clever and compact structure, simple operation, and can quickly fix bolts, improving measurement speed. It can also effectively prevent bolts from shaking during measurement, improving the efficiency and accuracy of bolt length measurement and ensuring the accuracy of experimental results. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] Figure 2 This is a diagram showing the usage state of this utility model.

[0011] In the diagram: 1. Adjustable anchor bolt; 2. Universal level; 3. Working platform; 4. Strong magnetic point; 5. Magnetic control switch; 6. Robotic arm; 7. Clamping jaw; 8. Dial indicator height gauge; 9. Bolt to be measured. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0013] Example 1

[0014] like Figure 1The illustrated magnetic bolt length measuring device includes a working platform 3, a leveling mechanism for adjusting the level of the working platform 3, a magnetic attraction mechanism connected to the working platform 3, a clamping mechanism, and a dial indicator height gauge 8. The leveling mechanism includes adjustable anchor bolts 1 connected to the four corners of the bottom of the working platform 3 and universal level bulbs 2 embedded in the upper surface of the working platform 3. The magnetic attraction mechanism is used to attract the bolt 9 to be measured, including strong magnetic points 4 embedded in the upper surface of the working platform 3 and a mechanism for controlling the presence or absence of magnetic force at the strong magnetic points 4. The magnetic control switch 5; the clamping mechanism and the dial indicator height gauge 8 are located on both sides of the strong magnetic point 4. The clamping mechanism is used to clamp the bolt 9 to be measured, and includes a robotic arm 6 and a clamping claw 7. The vertical rod of the robotic arm 6 is connected to one side of the working platform 3. An adjustable arm that can be adjusted up and down is connected to the vertical rod. The front end of the adjustable arm is connected to the clamping claw 7 through multiple universal ball joints. The dial indicator height gauge 8 is used to measure the length of the bolt 9 to be measured, and includes a measuring seat located opposite the clamping claw 7 and a dial indicator connected to the measuring seat.

[0015] The universal ball joint of the robotic arm 6 is connected to the rear end of the gripper 7, and the orientation of the gripper 7 can be adjusted 360°. The adjustment range of the adjusting arm of the robotic arm 6 is 50-300mm. The gripper 7 is a metal crab claw with a threaded adjustable structure and a gripping range of 10-45mm. The clamping part is made of protective rubber to ensure the stability and firmness of the gripping.

[0016] The working platform 3 has dimensions of 350mm in length, 250mm in width, and 30mm in thickness.

[0017] The magnetic switch 5 includes two positions, which correspond to the presence or absence of magnetic force at the strong magnetic point 4, and its magnetic force can ensure that the bolt 9 under test is stable and does not shake.

[0018] This embodiment uses an M24*150 external hex bolt as an example to illustrate the specific operating steps of the above-mentioned magnetic bolt length measuring device:

[0019] Place the work platform 3 on a stable platform or table. Adjust the four adjustable anchor bolts 1 and observe the universal spirit level 2 until the work platform 3 is level. Place the bolt to be tested 9 (M24*150) vertically on the strong magnetic point 4 and turn on the magnetic control switch 5 to attract the bolt to be tested 9 to the strong magnetic point 4. Adjust the position of the robotic arm 6 and use the gripper 7 to hold the bolt to be tested 9 to ensure that the bolt to be tested 9 is stable and does not wobble. Then move the dial indicator height gauge 8 measuring base and use the lower probe of the dial indicator to measure the initial length l0 of the bolt to be tested 9. Adjust the magnetic control switch 5 to make the magnetic force of the strong magnetic point 4 disappear. After removing the bolt to be tested 9 from the strong magnetic point 4, perform a load test. After unloading, measure the bolt length l1 again with the dial indicator. The length difference of the bolt to be tested 9 before and after the load test is Δl = l1 - l0. If -12.5μm ≤ Δl ≤ 12.5μm, the bolt load test is qualified.

[0020] The embodiments of this utility model have been disclosed above, but they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A magnetic bolt length measuring device, characterized in that: The system includes a working platform (3), a leveling mechanism for adjusting the level of the working platform (3), a magnetic attraction mechanism, a clamping mechanism, and a dial indicator height gauge (8) connected to the working platform (3). The leveling mechanism includes adjustable anchor bolts (1) connected to the four corners of the bottom of the working platform (3) and a universal level bubble (2) embedded in the upper surface of the working platform (3). The magnetic attraction mechanism is used to attract the bolt (9) to be tested and includes a strong magnetic point (4) embedded in the upper surface of the working platform (3) and a magnetic control switch (5) for controlling the presence or absence of the magnetic force of the strong magnetic point (4). The clamping mechanism and the dial indicator height gauge (8) are located on both sides of the strong magnetic point (4). The clamping mechanism is used to clamp the bolt (9) to be measured, including a robotic arm (6) and a clamping claw (7). The vertical rod of the robotic arm (6) is connected to one side of the working platform (3). An adjustable arm that can be adjusted up and down is connected to the vertical rod. The front end of the adjustable arm is connected to the clamping claw (7) through multiple universal ball joints. The dial indicator height gauge (8) is used to measure the length of the bolt (9) to be measured, including a measuring seat located opposite the clamping claw (7) and a dial indicator connected to the measuring seat.

2. The magnetic bolt length measuring device according to claim 1, characterized in that: The universal ball joint of the robotic arm (6) is connected to the rear end of the gripper (7), and the orientation of the gripper (7) can be adjusted 360°. The adjustment range of the adjusting arm of the robotic arm (6) is 50-300mm. The gripper (7) is a metal crab claw with a threaded adjustable structure and a gripping range of 10-45mm. The caliper engagement part is made of protective rubber to ensure gripping stability and firmness.

3. The magnetic bolt length measuring device according to claim 1, characterized in that: The working platform (3) has dimensions of 350mm in length, 250mm in width, and 30mm in thickness.

4. The magnetic bolt length measuring device according to claim 1, characterized in that: The magnetic switch (5) includes two positions, which correspond to the presence or absence of magnetic force at the strong magnetic point (4).

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