An internal circle runout inspection tool

Abstract

The present invention relates to an internal circle runout inspection tool, comprising a rotating seat, a lever, a gauge and a clearance elimination mechanism, wherein a lever seat is fixed on the upper end surface of the rotating seat, the middle part of the lever is rotatably installed in a through hole through a rotating shaft, and a tension spring is installed between the gauge seat and the lever; the clearance elimination mechanism comprises a taper sleeve, a ball and a preload adjustment sleeve, the two ends of the taper sleeve are provided with concave taper surfaces, the taper sleeve is arranged between the rotating shaft and the lever, a plurality of balls are respectively arranged in the taper surfaces at the two ends of the taper sleeve, the shaft shoulder abuts against the ball in the taper surface at one end of the taper sleeve, a preload adjustment sleeve is also mounted on the rotating shaft, one end of the preload adjustment sleeve abuts against the ball in the taper surface at the other end of the taper sleeve, a gasket is mounted on the rotating shaft, the gasket abuts against the other end of the preload adjustment sleeve, and then is locked by a nut. The present invention eliminates the gap between the lever and the rotating shaft through the ball and the taper sleeve, so that the lever can withstand a large force along the axis of the rotating shaft, the lever will not swing in the axis direction of the rotating shaft, and the measurement stability is high.

Description

Technical Field

[0001] The invention relates to the technical field of checking tools, in particular to an inner circle runout checking tool. Background Art

[0002] Circle run-out refers to the difference between the maximum and minimum readings measured in a given direction by a fixed indicator when the workpiece being measured rotates around the reference axis.

[0003] During the production of parts, the circular runout value is often tested. The existing circular runout gauge uses a rotating shaft and a lever to form a match. One end of the lever abuts against the inner wall of the workpiece to be measured, and the other end measures its swing value through a meter. In order to allow the lever to rotate freely, there is usually a clearance fit between the rotating shaft and the lever. During the rotation detection of the gauge, the lever is subjected to the force of the inner wall of the workpiece to be measured, causing the lever to swing in the axial direction of the rotating shaft, and ultimately resulting in a large measurement error. Summary of the invention

[0004] The purpose of the present invention is to overcome the disadvantages of the prior art and provide an internal circle runout inspection tool.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] An internal circle runout inspection tool comprises a rotating seat, a lever, a gauge and a clearance elimination mechanism, wherein the rotating seat is a cylindrical structure, a through groove is axially opened on the outer wall of the rotating seat, a lever seat is fixed on the upper end surface of the rotating seat, a through hole is opened in the lever seat, the middle part of the lever is rotatably installed in the through hole through a rotating shaft, the lower end of the lever extends into the through groove, a ball head contact block is fixed to the lower end of the lever, an abutment block is fixed to the upper end of the lever, a gauge seat is fixed to one side of the lever seat, the gauge is clamped and fixed on the gauge seat, and the contact of the gauge abuts on the abutment block, and there is also a contact between the gauge seat and the lever. A tension spring is installed; the anti-backlash mechanism includes a tapered sleeve, a ball and a preload adjustment sleeve, both ends of the tapered sleeve are provided with concave tapered surfaces, the tapered sleeve is arranged between the rotating shaft and the lever, and a plurality of balls are respectively installed in the tapered surfaces at both ends of the tapered sleeve, a shoulder is provided on the rotating shaft, and the shoulder abuts against the ball in the tapered surface at one end of the tapered sleeve, a preload adjustment sleeve is also mounted on the rotating shaft, one end of the preload adjustment sleeve abuts against the ball in the tapered surface at the other end of the tapered sleeve, an external thread is provided on the end of the rotating shaft away from the shoulder, a gasket is mounted on this end, the gasket abuts against the other end of the preload adjustment sleeve, and then is locked by a nut.

[0007] Furthermore, the meter is a dial indicator or a micrometer.

[0008] Furthermore, in a natural state, the ball head end of the ball head contact block extends out from the through slot under the tension of the tension spring.

[0009] Furthermore, a handle is fixed on the upper end surface of the rotating seat.

[0010] Furthermore, there is an interference fit between the outer wall of the cone sleeve and the inner hole of the lever, and there is a clearance fit between the inner wall of the cone sleeve and the outer wall of the rotating shaft.

[0011] Further, the distance between the axis of the abutment block and the axis of the rotating shaft is a, the distance between the axis of the ball head contact block and the axis of the rotating shaft is b, and a=b.

[0012] The present invention has the following advantages:

[0013] The present invention adopts an open bearing structure as a clearance eliminating mechanism, and the position of the preload adjustment sleeve can be adjusted by a nut, thereby adjusting the tightening force between the ball and the tapered sleeve, thereby eliminating the gap between the lever and the rotating shaft by the ball and the tapered sleeve, so that the lever can withstand a larger force along the axis of the rotating shaft, the lever will not swing in the axis direction of the rotating shaft, and the measurement stability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 The enlarged structural diagram at B in the middle;

[0016] Figure 3 for Figure 1 AA cross-sectional structure diagram;

[0017] Figure 4 It is a schematic diagram of the present invention when measuring on a workpiece;

[0018] In the figure: 1-rotating seat, 1a-through groove, 2-meter seat, 3-lever seat, 3a-through hole, 4-rotating shaft, 4a-shoulder, 5-lever, 6-ball head contact block, 7-meter, 8-abutment block, 9-tension spring, 10-handle, 11-taper sleeve, 12-ball, 13-preload adjustment sleeve, 14-gasket, 15-nut. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0020] like Figures 1 to 3As shown, an internal circle runout inspection fixture comprises a rotating seat 1, a lever 5, a gauge 7 and a backlash elimination mechanism. The rotating seat 1 is a cylindrical structure. A through groove 1a is axially opened on the outer wall of the rotating seat 1. A lever seat 3 is fixed on the upper end surface of the rotating seat 1. A through hole 3a is opened in the lever seat 3. The middle part of the lever 5 is rotatably installed in the through hole 3a through a rotating shaft 4. The lower end of the lever 5 extends into the through groove 1a. A ball head contact block 6 is fixed to the lower end of the lever 5. An abutment block 8 is fixed to the upper end of the lever 5. A gauge seat 2 is fixed to one side of the lever seat 3. The gauge 7 is clamped and fixed on the gauge seat 2, and the contact of the gauge 7 abuts on the abutment block 8. A tension spring 9 is also installed between the gauge seat 2 and the lever 5. The anti-backlash mechanism includes a tapered sleeve 11, a ball 12 and a preload adjustment sleeve 13. Both ends of the tapered sleeve 11 are provided with concave tapered surfaces. The tapered sleeve 11 is arranged between the rotating shaft 4 and the lever 5. A plurality of balls 12 are respectively installed in the tapered surfaces at both ends of the tapered sleeve 11. A shoulder 4a is provided on the rotating shaft 4. The shoulder 4a abuts against the ball 12 in the tapered surface at one end of the tapered sleeve 11. A preload adjustment sleeve 13 is also mounted on the rotating shaft 4. One end of the preload adjustment sleeve 13 abuts against the ball 12 in the tapered surface at the other end of the tapered sleeve 11. An external thread is provided at one end of the rotating shaft 4 away from the shoulder 4a. A gasket 14 is mounted on this end. The gasket 14 abuts against the other end of the preload adjustment sleeve 13 and is then locked by a nut 15.

[0021] Furthermore, the gauge 7 is a dial gauge or a micrometer, and different measuring gauges can be selected according to different measuring accuracies.

[0022] Furthermore, in a natural state, the ball end of the ball contact block 6 extends out from the through slot 1a under the tension of the tension spring 9, ensuring that the ball end of the ball contact block 6 can abut against the inner wall of the workpiece to be measured.

[0023] Furthermore, a handle 10 is fixed on the upper end surface of the rotating base 1 to facilitate the rotation of the inspection tool.

[0024] Furthermore, an interference fit is formed between the outer wall of the cone sleeve 11 and the inner hole of the lever 5 , and a clearance fit is formed between the inner wall of the cone sleeve 11 and the outer wall of the rotating shaft 4 .

[0025] More preferably, the distance between the axis of the abutment block 8 and the axis of the rotating shaft 4 is a, the distance between the axis of the ball head contact block 6 and the axis of the rotating shaft 4 is b, and a=b, which can simplify the measurement, that is, the reading of Table 7 is the circular runout value.

[0026] The working process of the present invention is as follows: Figure 4As shown, put the rotating seat 1 of the present invention into the circular groove of the workpiece to be measured, so that the ball end of the ball head contact block 6 abuts against the inner wall of the workpiece to be measured, return the meter 7 to zero, hold the handle 10 by hand, rotate it slowly, observe the change of the reading of the meter 7, and the difference between the maximum reading and the minimum reading is the circular runout value.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal circle runout inspection tool, characterized by: The invention comprises a rotating seat (1), a lever (5), a meter (7) and a clearance eliminating mechanism, wherein the rotating seat (1) is a cylindrical structure, a through groove (1a) is formed on the outer wall of the rotating seat (1) in the axial direction, a lever seat (3) is fixed on the upper end surface of the rotating seat (1), a through hole (3a) is formed in the lever seat (3), the middle part of the lever (5) is rotatably mounted in the through hole (3a) via a rotating shaft (4), the lower end of the lever (5) extends into the through groove (1a), a ball head contact block (6) is fixed at the lower end of the lever (5), an abutment block (8) is fixed at the upper end of the lever (5), a meter seat (2) is fixed on one side of the lever seat (3), the meter (7) is clamped and fixed on the meter seat (2), and the contact of the meter (7) abuts on the abutment block (8), and a tension spring (9) is also installed between the meter seat (2) and the lever (5); The anti-backlash mechanism comprises a tapered sleeve (11), a ball (12) and a preload adjustment sleeve (13). The tapered sleeve (11) is provided with concave tapered surfaces at both ends. The tapered sleeve (11) is arranged between the rotating shaft (4) and the lever (5). A plurality of balls (12) are respectively arranged in the tapered surfaces at both ends of the tapered sleeve (11). The rotating shaft (4) is provided with a shaft shoulder (4a). The shaft shoulder (4a) abuts against the ball (12) in the tapered surface at one end of the tapered sleeve (11). The rotating shaft (4) is also provided with a preload adjustment sleeve (13). One end of the preload adjustment sleeve (13) abuts against the ball (12) in the tapered surface at the other end of the tapered sleeve (11). The rotating shaft (4) is provided with an external thread at one end away from the shaft shoulder (4a). A gasket (14) is arranged on the end. The gasket (14) abuts against the other end of the preload adjustment sleeve (13) and is then locked by a nut (15). In a natural state, the ball head end of the ball head contact block (6) extends out from the through slot (1a) under the tension of the tension spring (9); An interference fit is formed between the outer wall of the cone sleeve (11) and the inner hole of the lever (5), and a clearance fit is formed between the inner wall of the cone sleeve (11) and the outer wall of the rotating shaft (4); The distance between the axis of the abutment block (8) and the axis of the rotating shaft (4) is a, the distance between the axis of the ball head contact block (6) and the axis of the rotating shaft (4) is b, and a=b.

2. An internal circle runout gauge according to claim 1, characterized in that: The gauge (7) is a dial gauge or a micrometer.

3. The inner circle runout checking fixture according to claim 1, characterized in that: A handle (10) is also fixed on the upper end surface of the rotating seat (1).

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