阅读说明：本技术 花键有效长度测量头 (Spline effective length measuring head ) 是由 李德进 张军 谢勇 高则能 刘尊亮 于 2020-12-09 设计创作，主要内容包括：本发明公开了一种花键有效长度测量头,涉及测量工具技术领域；包括内径和待测工件的外径适配的导向筒、位于导向筒一端的端板、和端板连接的百分表；所述待测工件上的外花键之间形成凹槽；所述导向筒远离端板的一端的内侧设有和凹槽适配的限位凸起,所述导向筒侧壁上穿过有顶针,所述顶针和导向筒滑动连接,所述导向筒上设有用于对顶针位于导向筒外侧的一端进行限位的限位机构。本发明的有益效果是：本实施例每次测量的时候,顶针均能抵靠在凹槽的槽底,不会因顶针的磨损和导致测量误差。(The invention discloses a spline effective length measuring head, relating to the technical field of measuring tools; the device comprises a guide cylinder with the inner diameter matched with the outer diameter of a workpiece to be measured, an end plate positioned at one end of the guide cylinder and a dial indicator connected with the end plate; a groove is formed between the external splines on the workpiece to be measured; the inner side of one end, far away from the end plate, of the guide cylinder is provided with a limiting protrusion matched with the groove, the side wall of the guide cylinder is provided with a thimble in a penetrating mode, the thimble is connected with the guide cylinder in a sliding mode, and the guide cylinder is provided with a limiting mechanism used for limiting the end, located outside the guide cylinder, of the thimble. The invention has the beneficial effects that: in this embodiment at every turn when measuring, the thimble homoenergetic supports and leans on the tank bottom at the recess, can not be because of the wearing and tearing of thimble with lead to measuring error.)

1. A spline effective length measuring head is characterized by comprising a guide cylinder, an end plate and a dial indicator, wherein the inner diameter of the guide cylinder is matched with the outer diameter of a workpiece to be measured;

a groove is formed between the external splines on the workpiece to be measured;

the inner side of one end, far away from the end plate, of the guide cylinder is provided with a limiting protrusion matched with the groove, the side wall of the guide cylinder is provided with a thimble in a penetrating mode, the thimble is connected with the guide cylinder in a sliding mode, and the guide cylinder is provided with a limiting mechanism used for limiting the end, located outside the guide cylinder, of the thimble.

2. The effective spline length measuring head according to claim 1, wherein the guide cylinder is provided with a spring for applying a force to the thimble towards the outside of the guide cylinder, an iron block is provided at an end of the thimble located at the outside of the guide cylinder, an electromagnet is provided at a side of the iron block away from the guide cylinder, and the electromagnet is fixedly connected with the guide cylinder.

3. The spline effective length measurement head of claim 2, wherein;

the limiting mechanism comprises an electric cylinder positioned outside the guide cylinder, a limiting plate positioned on one side of the iron block far away from the guide cylinder, and a proximity switch positioned on one side of the limiting plate close to the iron block;

the limiting plate is connected with an output shaft of the electric cylinder, and the proximity switch is connected with the electric cylinder.

4. The effective spline length measuring head according to claim 2, wherein a cavity is formed in a side wall of the guide cylinder, the spring is located in the cavity, the spring is sleeved on the ejector pin, the ejector pin penetrates through the cavity, one end of the spring is connected with the inner wall of the cavity, and the other end of the spring is connected with the ejector pin.

5. The splined effective length measuring head of claim 1, wherein the guide cylinder and the end plate are of unitary construction.

6. The spline effective length measuring head of claim 1, wherein the external splines of the workpiece to be measured are arranged in an annular array centered on the axis of the workpiece to be measured.

7. The spline effective length measuring head according to claim 6, wherein the limit projections are arranged in an annular array centered on the axis of the guide cylinder.

Technical Field

The invention belongs to the technical field of measuring tools, and particularly relates to a spline effective length measuring head.

Background

Spline coupling is an important coupling method in mechanical transmission. With the rapid development of manufacturing industries represented by the automobile industry, the demand for splines is increasing, and meanwhile, various requirements for the splines are higher and higher, and the detection items for the splines are also increasing.

Current measuring heads are prone to wear during measurement, resulting in measurement errors.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a spline effective length measuring head which is good in durability and accurate in measurement.

In order to achieve the purpose, the invention adopts the following technical scheme:

a spline effective length measuring head comprises a guide cylinder with the inner diameter matched with the outer diameter of a workpiece to be measured, an end plate positioned at one end of the guide cylinder and a dial indicator connected with the end plate; a groove is formed between the external splines on the workpiece to be measured; the inner side of one end, far away from the end plate, of the guide cylinder is provided with a limiting protrusion matched with the groove, the side wall of the guide cylinder is provided with a thimble in a penetrating mode, the thimble is connected with the guide cylinder in a sliding mode, and the guide cylinder is provided with a limiting mechanism used for limiting the end, located outside the guide cylinder, of the thimble.

Preferably, a spring used for applying force towards the outer side of the guide cylinder to the ejector pin is arranged on the guide cylinder, an iron block is arranged at one end, located on the outer side of the guide cylinder, of the ejector pin, an electromagnet is arranged on one side, away from the guide cylinder, of the iron block, and the electromagnet is fixedly connected with the guide cylinder.

Preferably, the limiting mechanism comprises an electric cylinder positioned outside the guide cylinder, a limiting plate positioned on one side of the iron block far away from the guide cylinder, and a proximity switch positioned on one side of the limiting plate close to the iron block; the limiting plate is connected with an output shaft of the electric cylinder, and the proximity switch is connected with the electric cylinder.

Preferably, a cavity is arranged in the side wall of the guide cylinder, the spring is located in the cavity and sleeved on the ejector pin, the ejector pin penetrates through the cavity, one end of the spring is connected with the inner wall of the cavity, and the other end of the spring is connected with the ejector pin.

Preferably, the guide cylinder and the end plate are of an integrally formed structure.

Preferably, the external splines of the workpiece to be measured are arranged in an annular array with the shaft of the workpiece to be measured as the center.

Preferably, the limiting protrusions are arranged in an annular array with the axis of the guide cylinder as the center.

The invention has the beneficial effects that: in this embodiment at every turn when measuring, the thimble homoenergetic supports and leans on the tank bottom at the recess, can not be because of the wearing and tearing of thimble with lead to measuring error.

Drawings

FIG. 1 is a schematic diagram of an embodiment;

FIG. 2 is a schematic view of the embodiment when measured;

FIG. 3 is a cross-sectional view B-B of FIG. 2;

FIG. 4 is a schematic diagram of a workpiece to be measured.

In the figure: the device comprises a workpiece to be measured 1, a guide cylinder 2, an end plate 3, a dial indicator 4, an external spline 5, a groove 6, a limiting protrusion 7, a thimble 8, a spring 9, an iron block 10, an electromagnet 11, an electric cylinder 12, a limiting plate 13, a proximity switch 14 and a cavity 15.

Detailed Description

The invention is explained in further detail below with reference to the figures and the detailed description:

example (b):

referring to fig. 1 to 4, a spline effective length measuring head comprises a guide cylinder 2 with an inner diameter matched with the outer diameter of a workpiece 1 to be measured, an end plate 3 positioned at one end of the guide cylinder 2, and a dial indicator 4 connected with the end plate 3;

a groove 6 is formed between the external splines 5 on the workpiece 1 to be measured;

the inboard of the one end of end plate 3 is kept away from to guide cylinder 2 is equipped with spacing arch 7 with recess 6 adaptation, it has thimble 8 to pass on the 2 lateral walls of guide cylinder, thimble 8 and 2 sliding connection of guide cylinder, be equipped with on the guide cylinder 2 and be used for carrying out spacing stop gear to the one end that thimble 8 is located the 2 outsides of guide cylinder.

Be equipped with on the guide cylinder 2 and be used for exerting the spring 9 towards the power in the guide cylinder 2 outside to thimble 8, the one end that thimble 8 is located the guide cylinder 2 outside is equipped with iron plate 10, one side that guide cylinder 2 was kept away from to iron plate 10 is equipped with electro-magnet 11, electro-magnet 11 and guide cylinder 2 rigid coupling.

The limiting mechanism comprises an electric cylinder 12 positioned on the outer side of the guide cylinder 2, a limiting plate 13 positioned on one side, far away from the guide cylinder 2, of the iron block 10, and a proximity switch 14 positioned on one side, close to the iron block 10, of the limiting plate 13;

the limiting plate 13 is connected with an output shaft of the electric cylinder 12, and the proximity switch 14 is connected with the electric cylinder 12.

Be equipped with cavity 15 in the lateral wall of guide cylinder 2, spring 9 is located cavity 15, spring 9 overlaps on thimble 8, thimble 8 passes cavity 15, spring 9 one end and the interior wall connection of cavity 15, the spring 9 other end is connected with thimble 8.

The guide cylinder 2 and the end plate 3 are of an integrally formed structure.

The external splines 5 of the workpiece 1 to be measured are arranged in an annular array with the shaft of the workpiece 1 to be measured as the center.

The limiting protrusions 7 are arranged in an annular array with the axis of the guide cylinder 2 as the center.

Principle of embodiment:

the end part of the external spline 5 of the workpiece 1 to be measured forms an arc transition region due to the process, and the effective length L of the external spline 5 is the length from the end part of the workpiece 1 to be measured to the starting point of the transition region, see fig. 4.

During measurement, an electromagnet 11 operates, an iron block 10 is adsorbed on the electromagnet, see a diagram 1, then a workpiece 1 to be measured is inserted from the end part of a guide cylinder 2, a limiting protrusion 7 is connected in a sliding manner in a groove 6, the limiting protrusion 7 is in clearance fit with the groove bottom of the groove 6, then the electromagnet is turned off, a thimble 8 is pressed against the groove bottom of the groove 6 under the action of a spring 9, see a diagram 3, then an electric cylinder 12 operates, a limiting plate 13 moves towards the iron block 10, when the iron block and the limiting plate abut against each other, a proximity switch 14 turns off the electric cylinder 12, then the workpiece 1 to be measured is continuously inserted into the guide cylinder 2, the end part of the workpiece 1 to be measured pushes a dial indicator 4, meanwhile, the end part of the thimble 8 slides in the groove bottom of the groove 6, when the end part of the thimble 8 reaches the starting point of the transition region (also the end part of the, referring to fig. 2, at this time, the effective length of the external spline 5 can be calculated from the reading of the dial indicator 4.

In this embodiment at every measurement, the thimble homoenergetic is supported and is leaned on the tank bottom of recess 6, can not be because of the wearing and tearing of thimble with lead to measuring error.