CN209936498U

CN209936498U - Grating ruler reading head

Info

Publication number: CN209936498U
Application number: CN201920283821.9U
Authority: CN
Inventors: 周科进
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2020-01-14
Anticipated expiration: 2029-03-06

Abstract

The utility model discloses a grating ruler reading head, which comprises a reading head main body, wherein the reading head main body is arranged on a grating ruler, the reading head main body comprises a reading head, a pulley, three bearings which are arranged on the pulley and roll along the scribing surface of the grating ruler, and two bearings which are arranged on the pulley and roll along the side surface of the grating ruler, and the reading head and the pulley are connected into a whole through an elastic rod; wherein, the reading head includes 5 pairs of infrared geminate transistors and instruction grating, 5 pairs of infrared geminate transistors and instruction grating electric connection, instruct the grating to extend to the coaster inside, and with the inside subdivision circuit board electric connection of coaster. The utility model discloses an integral type structure is connected with the coaster to the first main part of reading, and the moving as a whole of formation is steady, and measurement accuracy is high.

Description

Grating ruler reading head

Technical Field

The utility model relates to a measuring instrument technical field, more specifically the utility model relates to a grating ruler reading head that says so.

Background

The grating is a photoelectric detection element made by using the phenomena of light transmission and diffraction, and mainly comprises two parts, namely a scale grating and a grating reading head, wherein the scale grating is usually fixed on a movable part (such as a workbench or a lead screw) of a machine tool, the grating reading head is installed on a fixed part (such as a machine tool base) of the machine tool, and the scale grating and the grating reading head move relatively along with the movement of the workbench. Therefore, the grating ruler measurement system is widely used in various machine tools, electromechanical equipment and automatic measurement equipment. The sliding part between the reading head and the grating glass of the grating ruler is widely in a reliable and durable five-bearing structure, namely five bearings are distributed on different side surfaces of the reading head pulley, so that five contact points are kept between the pulley and the grating glass in the relative sliding process, and the reading head can stably and smoothly slide on the grating glass for a long time.

However, most of the reading heads and the pulleys of the existing grating ruler are split, and when the pulleys slide under severe vibration or high speed conditions, the pulleys can be ensured to be in stable contact with the grating of the ruler and smoothly slide to pass through, so that the vibration of the reading heads is still inevitable, and the precision of the grating ruler is influenced.

Therefore, it is an urgent problem to provide a grating scale reading head with high measurement accuracy.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a grating ruler reading head, reading head main part and coaster are connected formula structure as an organic whole, and the bulk movement of formation is steady, and measurement accuracy is high.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a grating ruler reading head comprises a reading head main body, wherein the reading head main body is installed on a grating ruler and comprises a reading head, a pulley, three bearings which are installed on the pulley and roll along the scribing surface of a scale grating and two bearings which are installed on the pulley and roll along the side surface of the scale grating, and the reading head and the pulley are connected into a whole through an elastic rod;

the reading head comprises 5 pairs of infrared geminate transistors and an indication grating, 5 pairs of infrared geminate transistors are electrically connected with the indication grating, and the indication grating extends to the interior of the pulley and is electrically connected with the subdivision circuit board in the pulley.

Furthermore, the extending end of the elastic rod is a sphere which is fixed in a groove formed in the reading head.

Further, the thickness of the indication grating is 1.1 mm.

Further, the gap between the indication grating and the scale grating of the grating ruler is 0.02 mm.

Through taking above scheme, the beneficial effects of the utility model are that:

when the pulley moves on the scale grating of the grating ruler by 90 degrees, the indication grating and the scale grating move relatively, and the stripes of the scale grating and the stripes of the indication grating generate light and shade alternate stripes called moire stripes which are grating signals, wherein the grating signals are transmitted and received by five pairs of infrared geminate transistors on the pulley and are finally converted into data transmission through the subdivision circuit board. The reading head main part is connected formula structure as an organic whole with the coaster, and instructs the grating to extend to the coaster inside, and the subdivision circuit board is fixed inside the coaster, and the overall stability of formation is better, can avoid reading head and instructing the not steady of grating, ensures the accuracy of reading to ensure whole grating chi measurement system's precision.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of a grating ruler reading head according to the present invention;

fig. 2 is a top view of a grating ruler reading head according to the present invention.

In the figure: 1-reading head, 2-pulley, 3-elastic rod, 4-subdivision circuit board, 11-infrared geminate transistor, 12-indication grating.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, the embodiment of the utility model discloses a grating ruler reading head, including the reading head main part, the reading head main part is installed on the grating ruler, the reading head main part includes reading head 1, coaster 2 and three bearings installed on coaster 2 and rolling along the scale grating ruling surface and two bearings installed on coaster 2 and rolling along the scale grating side, reading head 1 and coaster 2 are connected as an organic whole through elastic rod 3; the reading head 1 comprises 5 pairs of infrared geminate transistors 11 and indication gratings 12, the 5 pairs of infrared geminate transistors 11 are electrically connected with the indication gratings 12, and the indication gratings 12 extend into the pulley 2 and are electrically connected with the subdivision circuit board 4 in the pulley 2. The utility model discloses a when coaster 2 becomes 90 degrees movements on the scale grating of grating scale, instruct grating 12 and scale grating to produce relative motion, the stripe of scale grating and the stripe of instructing grating 12 produce the alternate stripe of light and shade, are called moire fringe, and this moire fringe is exactly grating signal, and grating signal is by five on coaster 2 to infrared geminate transistors 11 transmission, receipt, converts data transmission into through subdivision circuit board 4 at last. The reading head main part is connected formula structure as an organic whole with coaster 2, and instructs grating 12 to extend to coaster 2 inside, and subdivision circuit board 4 is fixed inside coaster 2, and the overall stability of formation is better, can avoid reading head 1 and the unstability of instructing grating 12, ensures the accuracy of reading to ensure whole grating chi measurement system's precision.

Specifically, the extending end of the elastic rod 3 is a sphere fixed in a groove formed on the reading head 1.

Specifically, the thickness of the indication grating 12 is 1.1 mm.

Specifically, the gap between the indication grating 12 and the scale grating of the grating ruler is 0.02 mm.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grating ruler reading head comprises a reading head main body, wherein the reading head main body is arranged on a grating ruler, and the grating ruler reading head is characterized in that the reading head main body comprises a reading head, a pulley, three bearings which are arranged on the pulley and roll along a grating ruling surface of a scale grating, and two bearings which are arranged on the pulley and roll along the side surface of the scale grating, and the reading head and the pulley are connected into a whole through an elastic rod;

2. The grating tape reading head of claim 1 wherein the extended end of the flexible rod is a ball that is secured within a recess formed in the reading head.

3. A grating scale head according to claim 1, wherein the thickness of the indicator grating is 1.1 mm.

4. A grating scale head according to claim 2, wherein the gap between the indicator grating and the scale grating of the grating scale is 0.02 mm.