CN104390553A - Auxiliary measuring device for inner ring groove - Google Patents

Abstract

The invention provides an auxiliary measuring device for an inner ring groove, which includes a measuring head, the measuring head includes two measuring sliders, and the measuring sliders are slidably assembled on the positioning cylinder along the radial direction, and the positioning cylinder has an inner hole for connecting with the measured piece. The inner peripheral surface of the hole coincides with the outer peripheral surface. The auxiliary measuring device for the ring groove of the inner hole has two states: unmeasured state and measured state. In the unmeasured state, the measuring slider is completely retracted into the positioning cylinder and its outer end does not protrude from the positioning cylinder. Outer peripheral surface, in the measurement state, the measuring slide block protrudes from the outer peripheral surface of the positioning cylinder and its outer end is used for pushing and limiting cooperation with the groove bottom of the inner ring groove in the outward direction. The auxiliary measuring device for the ring groove of the inner hole of the invention can ensure that the measuring head is perpendicular to the inner hole axis of the measured piece, and the measurement data is accurate, while the structure is very simple and the use cost is low.

Description

Auxiliary measuring device for inner ring groove

technical field

The invention relates to an auxiliary measuring device for an inner ring groove.

Background technique

There are ring grooves on the inner hole walls of some parts, and it is very inconvenient to measure these ring grooves. The two measuring claws of ordinary vernier calipers cannot extend into the ring grooves, so it is impossible to measure these inner hole ring grooves, which affects Processing quality of parts.

The Chinese invention patent with the notification number CN101706242 discloses a compound measuring ruler with an inner ring groove. The end of the measuring rod of the measuring ruler is equipped with a measuring head. The measuring head is composed of two symmetrical sliding blocks. There is a rack on the surface, and the measuring rod is provided with a gear that meshes with the racks on the two sliding blocks. Turn the measuring rod so that the two sliding blocks are far away from each other and go deep into the groove bottom of the ring groove. The radial size is converted into the rotation angle of the measuring rod to measure the size of the inner ring groove. However, when measuring this kind of measuring ruler, the deviation in the inner hole often occurs because the measuring rod cannot accurately ensure that it coincides with the axis of the inner hole to be measured. Move, so that the measuring head at the end of the measuring rod cannot guarantee contact with the groove bottom of the inner ring groove on a plane perpendicular to the axis of the inner hole, so that the measured size of the inner ring groove will be larger than the actual size of the inner ring groove, A large error is generated, which seriously affects the measurement accuracy.

Contents of the invention

The purpose of the present invention is to provide an auxiliary measuring device for an inner ring groove with high measuring accuracy.

The auxiliary measuring device for the inner ring groove of the present invention adopts the following technical scheme: the auxiliary measuring device for the inner ring groove includes a measuring head, and the measuring head includes two measuring sliders, and the measuring sliders are slidably assembled in the radial direction On the positioning cylinder, the positioning cylinder has an outer peripheral surface for matching with the inner peripheral surface of the inner hole of the measured piece, and the auxiliary measuring device of the inner hole annular groove has two states: an unmeasured state and a measured state. In the measurement state, the measuring slider is completely retracted into the positioning cylinder and its outer end does not expose the outer peripheral surface of the positioning cylinder. Thrust limit fit in outward direction.

The auxiliary measuring device for the ring groove of the inner hole also includes a support pad whose lower surface is used to contact the lower groove wall of the inner ring groove and whose upper surface is used to support the lower end of the positioning cylinder when in use.

The two measuring sliders are located on the same straight line perpendicular to the axis of the positioning cylinder.

The measuring head of the inner ring groove auxiliary measuring device of the present invention is slidably assembled on the positioning cylinder along the radial direction. The cylinder is inserted into the inner hole of the tested piece. Since the outer peripheral surface of the positioning cylinder matches the inner peripheral surface of the inner hole of the tested piece, the positioning of the positioning cylinder and the inner hole of the tested piece ensures that the positioning cylinder is completely stable during the entire measurement process. Coincident with the axis of the inner hole of the tested part, the measuring head assembled on the positioning cylinder by sliding and guiding in the radial direction can contact the groove bottom of the inner ring groove perpendicular to the axis of the positioning cylinder, so that the size of the inner ring groove can be accurately measured .

Further, by setting the supporting backing plate, the supporting backing plate is placed on the lower side groove wall of the ring groove of the inner hole during measurement, and the positioning cylinder can be directly placed on the supporting backing plate to carry out the measurement, and the positioning cylinder does not need to be placed all the time. Inserted into the lower end of the inner hole, when the inner hole of the tested part is deep and the ring groove is located at the upper end of the inner hole, the length of the positioning cylinder is greatly shortened, the whole measurement process is more convenient, and the material for manufacturing the positioning cylinder is saved.

Description of drawings

Fig. 1 is a kind of structure schematic diagram of tested part;

Fig. 2 is a three-dimensional exploded schematic diagram of an embodiment of an auxiliary measuring device for an inner ring groove of the present invention;

Fig. 3 is a schematic diagram of the assembly of the positioning cylinder and the measuring slider in Fig. 2;

Fig. 4 is a schematic diagram when the positioning cylinder is inserted into the measured piece;

Fig. 5 is a schematic diagram of the auxiliary measurement device for inner ring grooves of the present invention during measurement.

Detailed ways

An embodiment of an auxiliary measurement device for an inner ring groove of the present invention: as shown in Figure 2-3, it includes a positioning cylinder 1, and the positioning cylinder 1 has an outer peripheral surface that matches the inner peripheral surface of the inner hole of the measured piece The wall of the positioning cylinder 1 is provided with two radially extending mounting holes 12. The two mounting holes 12 are rectangular holes and are arranged on both sides of the axis of the positioning cylinder corresponding to each other. The mounting holes 12 are guided and slid in the radial direction. There is a measuring slider 2, the measuring slider 2 is a rectangular block and is located on the same straight line perpendicular to the axis of the positioning cylinder, as shown in Figure 3 is the assembly relationship between the measuring slider 2 and the positioning cylinder 1, the measuring slider 2 The two ends that are far away from each other and can extend out of the positioning cylinder 1 are the positioning ends 21. The positioning ends are arc-shaped. In the direction of the axis, stop and limit fit. When the auxiliary measuring device of the inner ring groove of the present invention is in use, the positioning cylinder 1 is inserted into the inner hole of the measured piece. The inner circumferential surface of the inner hole fits perfectly, and the positioning cylinder coincides with the axis of the inner hole of the measured piece. At this time, the measuring slider 2 is pushed to extend out of the positioning cylinder 1 and the positioning end of the measuring slider 2 is aligned with the measured inner hole ring. The bottom of the groove is in close contact, and the two measuring sliders then use a vernier caliper or a go-no-go gauge to measure the distance between the two end faces of the two measuring sliders 2 located in the positioning cylinder, and add the distance to the two measuring sliders 2 The length is the size of the ring groove of the inner hole. The measuring slider 2 can completely slide and retract into the inside of the positioning cylinder 1, and there will be no interference when the positioning cylinder is inserted into the inner hole of the measured object. the

When the inner hole of the tested piece 100 is a through hole with a constant diameter on the upper and lower sides of the ring groove or a blind hole but the blind end of the blind hole is not a side wall of the ring groove, as shown in Figure 4, the inner hole The ring groove auxiliary measuring device also includes a supporting backing plate 3. When measuring, the supporting point backing plate 3 is placed on the groove bottom 101 of one side of the annular groove of the inner hole to be measured, and the positioning cylinder is placed on the supporting backing plate 3 and the measurement is performed. The slider can be located at the height corresponding to the bottom of the ring groove, which can reduce the length of the positioning cylinder extending into the inner hole of the measured piece, reduce the overall length of the positioning cylinder, and make the operation more convenient; in the measured piece 100 When the groove bottom of the inner ring groove is a curved surface on the axial section of the ring groove, in order to measure the maximum radial dimension of the ring groove, it is necessary to place the measuring slider at the same height as the maximum groove depth of the ring groove, as shown in Figure 5 As shown, when the ring groove is a V-shaped ring groove, the axial position of the installation hole on the positioning cylinder needs to be set so that the measuring slider just corresponds to the middle position of the ring groove when the positioning cylinder is installed into the inner hole of the tested part. , in this case, it is necessary to set the axial position of the mounting hole according to whether the positioning cylinder is supported by a support pad. The sum of the axial distances of the ends should be equal to half of the axial depth of the ring groove, and the positioning end of the measuring slider can be set as a top structure, so as to facilitate the contact between the positioning end and the deepest groove bottom of the V-shaped groove.

In this embodiment, the two measuring sliders are located on a straight line perpendicular to the axis of the positioning cylinder. In other embodiments, the two measuring sliders can be arranged in parallel and at intervals. Measure the distance between the two ends of the positioning cylinder in the extending direction of the slider.

The auxiliary measuring device for the ring groove of the inner hole can ensure that the measuring slider is perpendicular to the axis of the inner hole during measurement, the measurement data is accurate, and it can be applied to the measurement of various ring grooves. The structure is simple and the operation is convenient. The auxiliary measuring device can cooperate with common measuring tools such as vernier calipers or go-no-go gauges to measure the inner hole, thereby reducing the production cost. the

Claims (3)

1. internal circular-grooves aided measurement device, comprise measuring head, described measuring head comprises two and measures slide block, it is characterized in that, described measurement slide block is radially slidedly assemblied on positioning tube, described positioning tube has the outer circumference surface for matching with the endoporus inner peripheral surface of measured piece, described internal circular-grooves aided measurement device has unmeasured state and measuring state two states, measure slide block to be fully retracted in positioning tube and positioning tube outer peripheral face is not exposed in its outer end when unmeasured state, measure when measuring state slide block stretch out the outer peripheral face of positioning tube and its outer end for thrust is spacing in outward direction coordinates with the bottom land of inner groove.

2. internal circular-grooves aided measurement device according to claim 1, it is characterized in that, when described internal circular-grooves aided measurement device is also included in use lower surface for contacting with the downside cell wall of internal circular-grooves, upper surface is for the support backing plate of the lower end of supporting and location cylinder.

3. internal circular-grooves aided measurement device according to claim 1 and 2, is characterized in that, described two measurement slide blocks are positioned on the straight line of same and positioning tube intersect vertical axis.