CN107941117A - Fastener ensures the micro linear change measuring device of load test - Google Patents

Abstract

The invention discloses a kind of fastener to ensure the micro linear change measuring device of load test, it includes rail brackets, ball-screw and guide rod are installed on rail brackets, workbench is installed between ball-screw and guide rod, the top of ball-screw is provided with handwheel, the upper surface middle part of workbench is equipped with arc groove, amesdial is placed in arc groove, the both sides of arc groove are arranged with spring detent, the measurement bar mounting hole through workbench is equipped with behind amesdial, the base of measurement bar mounting hole vertical lower is equipped with thimble；The lower surface of workbench is equipped with locating piece, the top of locating piece is equipped with the location hole opposite with spring detent mounting hole, the middle part of locating piece is equipped with the positioning measurement hole to match with measurement bar mounting hole, and the lower section in positioning measurement hole is equipped with the fastener location hole being adapted with the outside diameter of fastener to be measured.This invention ensures that in measurement process part to be measured stabilization, the measurement data accuracy that is obtained is high.

Description

Fastener Proof Load Test Trace Linear Variation Measuring Device

technical field

The invention relates to the technical field of length measuring equipment, in particular to a device for measuring trace linear changes in proof load tests of fasteners.

Background technique

Clause 9.6 "Proof Load Test for Fasteners" in GB/T3098.1-2010 "Mechanical Properties of Fasteners Bolts, Screws and Studs" stipulates that by implementing the specified proof load test and loading for 15s, the fasteners are measured by the guarantee Permanent elongation resulting from a load test. Evaluation criteria: The permanent elongation of the fastener is less than or equal to 12.5 μm.

At present, the vernier caliper commonly used to measure the length of fasteners is not accurate enough (measurement accuracy: 0.01mm), the measuring length range of the screw micrometer is limited, and the requirements for the reference plane of the measurement are high. In addition, systematic errors such as personnel and positions in the measuring device should be reduced as much as possible. Because fasteners have many specifications, a wide range of lengths, and different weights, it is particularly important to ensure the accuracy and stability of the test during the measurement process.

In view of the above problems, it is necessary to consider the measurement tools and measurement system. It is necessary to develop a device that meets the test requirements to ensure the accuracy of the measurement of the slight linear change of the fastener in the guaranteed load test, and to ensure that the test measurement The operation is simple in the process, and the detection efficiency is improved.

Contents of the invention

The purpose of the present invention is to provide a measuring device for the trace linear change of the fastener guarantee load test, which can solve the positioning problem of the fastener in the test while ensuring the high precision required by the test, and reduce the influence of the measurement system error on the measurement result.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A fastener proof load test micro-linear change measuring device, which includes a guide rail bracket installed on the base, the guide rail bracket includes a ball screw and two guide rods parallel to each other, the ball screw and the guide rod are installed There is a horizontal working platform, the top of the ball screw is installed with a hand wheel, the upper surface of the working platform is provided with an arc-shaped groove in the middle, the dial indicator is placed in the arc-shaped groove, and the two sides of the arc-shaped groove are symmetrically arranged through the working platform. The back of the dial indicator is provided with a measuring rod mounting hole that runs through the working platform, and the base directly below the measuring rod mounting hole is provided with a vertical upward thimble that coincides with the centerline of the measuring rod mounting hole; the working platform The lower surface of the positioning block is provided with a replaceable positioning block, and the top of the positioning block is provided with a positioning hole opposite to the installation hole of the spring bayonet. The middle part of the positioning block is provided with a positioning measurement hole matching the installation hole of the measuring rod. A fastener positioning hole adapted to the outer diameter of the fastener to be tested is provided below.

Preferably, wear-resistant steel balls are provided at the tops of the thimble and the spring bayonet.

Preferably, the dial gauge is a lever dial gauge.

When the present invention is in use, a measuring tapered hole is set at the center of both ends of the fastener to be tested, and the top of the fastener to be tested is screwed into the fastener positioning hole of the positioning block, so that the top of the fastener to be tested is aligned with the The top of the fastener positioning hole is in full contact, and the measuring taper hole at the bottom center of the fastener to be tested is in contact with the top of the thimble on the base; place the dial indicator in the arc groove on the working platform, and the dial indicator Insert the measuring rod into the mounting hole of the measuring rod, turn the handwheel, so that the measuring rod of the dial gauge is gradually inserted into the positioning measuring hole in the center of the positioning block, when the front end of the measuring rod of the dial gauge and the measuring taper hole at the top of the fastener to be tested When in contact, the permanent elongation length of the fastener to be tested in the proof load test can be known through the degree of the dial indicator. When replacing the fastener to be measured, it is only necessary to lightly lift the measuring rod of the dial indicator, and lightly push the spring bayonet upward to take out and replace the fastener to be tested. According to the specifications of the fasteners to be tested, the positioning blocks of different specifications that are compatible with the fasteners to be tested are replaced to realize the testing of fasteners of various specifications.

The beneficial effects of the present invention are:

(1) The present invention adopts the three-point positioning method of the spring bayonet and the bottom thimble to locate the fastener to be tested, which can not only ensure the stability of the test piece during the measurement process, but also ensure that the measuring taper hole is on the same axis. The obtained measurement data has high accuracy and can meet the requirements of fastener testing;

(2) The present invention adjusts the height of the working platform through ball screws and guide rods, and clamps the fasteners to be tested through the positioning block, which can meet the measurement of fasteners of different models and specifications. The measurement specification range is M6~M60, and the length The range is 20mm~600mm, suitable for mass inspection, which improves the efficiency of inspection and reduces processing costs;

(3) The invention adjusts the height of the working platform through the handwheel to meet the measurement distance of fasteners, and at the same time, it can also perform fine adjustment of the measurement distance;

(4) In the present invention, an arc-shaped groove is arranged on the working surface to ensure the stability of the dial indicator, and a guide rod and a ball screw are used to form a parallel sliding guide rail, which ensures the balance and stability of the working platform and improves the accuracy of the measurement data;

(5) In the present invention, wear-resistant steel balls are arranged at the tops of the positioning thimbles and spring bayonet pins, which effectively prolongs the service life of the present invention and reduces the testing cost.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural representation of the positioning block in Fig. 1;

In the figure: 1. Hand wheel, 2. Ball screw, 3. Dial gauge, 4. Working platform, 5. Guide rod, 6. Spring detent, 7. Positioning block, 8. Fastener to be tested, 9 , thimble, 10, base, 11, test rod mounting hole, 12, measuring taper hole, 13, positioning hole, 14, positioning measuring hole, 15, fastener positioning hole.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Fig. 1 and Fig. 2, a fastener proof load test micro-linear change measuring device includes a guide rail bracket installed on a base 10, and the guide rail bracket includes a ball screw 2 and two guide rods 5 parallel to each other , A horizontal working platform 4 is installed between the ball screw 2 and the guide rod 5, the top of the ball screw 2 is equipped with a hand wheel 1, the middle part of the upper surface of the working platform 4 is provided with an arc groove, and the dial indicator 3 is placed on the In the arc-shaped groove, the two sides of the arc-shaped groove are symmetrically provided with the spring bayonet pin 6 that runs through the working platform 4, and the rear of the dial gauge 3 is provided with a measuring rod mounting hole 11 that runs through the working platform 4, and the measuring rod mounting hole 11 is vertically below The base 10 is provided with a vertically upward thimble 9 that coincides with the center line of the measuring rod mounting hole 11; the lower surface of the working platform 4 is provided with a replaceable positioning block 7, and the top of the positioning block 7 is provided with a spring bayonet. The positioning hole 13 opposite to the hole 6, the middle part of the positioning block 7 is provided with a positioning measuring hole 14 that matches the measuring rod mounting hole 11, and the positioning measuring hole 14 is provided below the outer diameter of the fastener to be tested. The fastener positioning hole 15.

The tops of the thimble 9 and the spring bayonet pin 6 are all provided with wear-resistant steel balls.

Dial gauge 3 is a lever dial gauge.

When the present invention is in use, a measuring tapered hole 12 is set at the center of both ends of the fastener to be tested 8, and the top of the fastener to be tested 8 is screwed into the fastener positioning hole 15 of the positioning block 7, so that the fastener to be tested The top of the fastener 8 is in full contact with the top of the fastener positioning hole 15, and the measuring taper hole 12 at the center of the bottom of the fastener 8 to be tested is in contact with the top of the thimble 9 on the base 10; the dial gauge 3 is placed on the working In the arc groove on the platform 4, the measuring rod of the dial indicator 3 is inserted into the measuring rod installation hole 11, and the handwheel 1 is turned, so that the measuring rod of the dial indicator 3 is gradually inserted into the positioning measuring hole 14 in the center of the positioning block 7, When the front end of the measuring rod of the dial gauge 3 is in contact with the measuring taper hole 12 at the top of the fastener 8 to be tested, the degree of the dial gauge 3 can be used to know the permanent force of the fastener 8 to be tested in the proof load test. Extended length. When replacing the fastener 8 to be measured, only need to lightly lift the measuring rod of the dial indicator 3, and lightly push the spring bayonet upward to take out and replace the fastener 8 to be tested. According to the specifications of the fasteners 8 to be tested, the positioning blocks 7 of different specifications matching the fasteners 8 to be tested are replaced to realize the testing of the fasteners 8 of various specifications.

The invention adopts the three-point positioning method of the spring bayonet and the bottom thimble to locate the fastener to be tested, which can not only ensure the stability of the test piece during the measurement process, but also ensure that the measuring taper hole is on the same axis, and the obtained measurement The data accuracy is high, which can meet the requirements of fastener testing; the invention adjusts the height of the working platform through the ball screw and the guide rod, and fixes the fastener to be tested through the positioning block, which can meet the requirements of fasteners of different models and specifications. Measurement, the measurement specification range is M6~M60, and the length range is 20mm~600mm, which is suitable for mass inspection, improves the efficiency of inspection, and reduces processing costs.

Claims (3)

1. a kind of fastener ensures the micro linear change measuring device of load test, it includes being installed on base（10）On guide rail Stent, it is characterised in that：The rail brackets includes ball-screw（2）With two guide rods being parallel to each other（5）, ball-screw （2）With guide rod（5）Between horizontal workbench is installed（4）, ball-screw（2）Top handwheel is installed（1）, work Platform（4）Upper surface middle part be equipped with arc groove, amesdial（3）It is placed in arc groove, the both sides of arc groove, which are arranged with, to be passed through Wear workbench（4）Spring detent（6）, amesdial（3）Behind be equipped with run through workbench（4）Measurement bar mounting hole （11）, measurement bar mounting hole（11）The base of vertical lower（10）It is equipped with and measurement bar mounting hole（11）What center line coincided Thimble straight up（9）；Workbench（4）Lower surface be equipped with replaceable locating piece（7）, locating piece（7）Top be equipped with With spring detent mounting hole（6）Opposite location hole（13）, locating piece（7）Middle part be equipped with and measurement bar mounting hole（11）Phase Matched positioning measurement hole（14）, positioning measurement hole（14）Lower section be equipped with the fastener that is adapted with the outside diameter of fastener to be measured Location hole（15）.

2. fastener according to claim 1 ensures the micro linear change measuring device of load test, it is characterised in that：Institute State thimble（9）, spring detent（6）Top be equipped with abrasion-proof steel ball.

3. fastener according to claim 1 or 2 ensures the micro linear change measuring device of load test, its feature exists In：The amesdial（3）For dial test indicator.