CN102538676B - Fastening device for casing of linear encoder - Google Patents

Abstract

A fastening device for a casing of a linear encoder belongs to the technical field of optics and is used for firmly fastening the casing to a part to be detected, and for effectively controlling deformation of the linear encoder upon temperature effect to be within a small range so that the linear coder has certain repeatable temperature property. The fastening for the casing of the linear encoder comprises a rigid casing support and a plurality of flexible casing supports, wherein the rigid casing support is fixed in the middle of the casing, and the flexible casing supports are fixed at equal intervals on the casing and disposed on two sides of the rigid casing support in bilateral symmetry. The rigid casing support is provided with a pin hole in the middle, each flexible casing support is provided with a through hole in the middle, and each flexible casing support is provided with grooves which are reserved on two sides of the through hole in bilateral symmetry. By the aid of the designed structure of the rigid casing support and the flexible casing supports, the deformation of the linear encoder upon temperature effect is controlled well, and the certain repeatable temperature property of the linear encoder is realized.

Description

A scale housing fixing device for a grating scale

technical field

The invention belongs to the field of optical technology, in particular to a scale housing fixing device of a grating scale.

Background technique

In the field of precision measurement and displacement control, the use of grating as a benchmark is internationally recognized as the most practical, economical and reliable technical measure to obtain high precision. The grating ruler measuring mechanism is a representative product to achieve this approach, and is widely used in various machine tools, electromechanical equipment, and automated measuring equipment.

When the grating ruler is installed on two mutually moving components as a measuring mechanism, the scale housing is connected with one component to be measured, and the carriage body is connected with the scanning mechanism with the other component to be measured. During the measurement process, the grating scale will be affected by factors such as the ball screw pair, and the temperature will change to a certain extent, resulting in thermal expansion and contraction, which will affect the accuracy of the grating scale.

Contents of the invention

The object of the present invention is to provide a scale shell fixing device for a grating scale, which firmly fixes the scale shell on the member to be measured, and effectively controls the deformation of the scale scale under the influence of temperature within a small range, Make the grating scale have definite and repeatable temperature characteristics.

The invention relates to a scale shell fixing device for a grating scale. The device is composed of a rigid scale shell support and a plurality of flexible scale shell supports. The rigid scale shell support is fixed at the middle position of the scale shell, and multiple flexible scale shell supports are fixed at equal intervals. On the scale shell, it is placed on both sides of the rigid scale shell support and is left-right symmetrical; a pin hole is set in the middle of the rigid scale shell support, a through hole is set in the middle of the flexible scale shell support, and the flexible scale shell support also has a groove at the The two sides of the through hole are arranged symmetrically;

A longitudinal guide groove is set on the ruler shell, and the nut is placed in the guide groove;

The first counterbore and the second counterbore are respectively set on both sides of the rigid scale shell bracket, and the rigid scale shell support and the scale shell are fixed together by the cooperation of the inner hexagon screw and the nut, and the hexagon socket head screw and the rigid scale shell bracket are provided. Elastic gasket;

The third counterbore and the fourth counterbore are respectively provided on both sides of the flexible scale shell bracket, and the flexible scale shell support and the scale shell are fixed together by the cooperation of the inner hexagon screw and the nut, and the hexagon socket head screw and the flexible scale shell support are provided. Elastic gasket;

A flexible support positioning surface corresponding to the left side of the scale shell is provided on the direction of the flexible scale shell support close to the member to be measured;

The rigid scale housing support has a rigid support positioning surface corresponding to the left side of the scale housing in the direction close to the member to be measured.

The scale housing fixing device of a grating ruler according to the present invention adopts a separate structure, and the deformation of the grating scale caused by the influence of temperature is better controlled through the design structure of the rigid scale housing bracket and multiple flexible scale housing brackets, realizing The definite and repeatable temperature characteristics of the grating ruler effectively guarantee the measurement accuracy of the grating ruler; the device has a simple structure, is convenient for processing, and is easy to implement and operate.

Description of drawings

Figure 1 is a front view of the scale case and its fixing device.

Fig. 2 is an A-A sectional view of the scale housing and its fixing device.

Fig. 3 is a front view of the flexible scale housing bracket.

Fig. 4 is a top view of the flexible scale housing support.

Fig. 5 is a front view of the rigid scale shell bracket.

Figure 6 is a top view of the rigid scale housing bracket.

In the figure, 1. Rigid ruler shell support, 2. Flexible ruler shell support, 3. Pin, 4. Bolt, 5. Ruler shell, 6. Elastic gasket, 7. Hexagon socket head cap screw, 8. Nut, 9. Flexible support Positioning surface, 10, through hole, 11, the first counterbore, 12, the second counterbore, 13, rigid support positioning surface, 14, pin hole, 15, the third counterbore, 16, the fourth counterbore, 17, Guide groove, 18, left side, 19, groove.

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a rigid scale shell support 1 is fixed in the middle of the scale shell 5, which is rigidly connected with the member to be measured through a pin 3; a flexible scale shell support 2 is respectively provided on both sides of the rigid scale shell support 1, They are flexibly connected with the component to be tested through bolts 4 . When the scale shell 5 expands and shrinks relative to the member to be measured due to temperature changes, the center of the scale shell 5 will not move due to the rigid scale shell bracket 1. When the temperature rises, the entire scale shell takes the center as the divergence point to the left and right Two directions expand, and when the temperature drops, both sides of the scale shell will shrink inward with the center as the converging point, and the scale shell 5 has definite and repeatable temperature characteristics.

If rigid connections are used, the grating ruler will not produce stretching deformation near the positioning hole, while other parts of the grating ruler will expand and contract when the temperature changes, which will lead to uneven deformation of the grating ruler with temperature changes, and the entire grating The temperature characteristics of the scale are uncertain; if flexible connections are used, the expansion and contraction deformation of the scale has an uncertain direction when the temperature changes, and the repeatable temperature characteristics of each part cannot be guaranteed.

The fixed connection methods of the two types of scale shell brackets and scale shell 5 are the same, taking the flexible scale shell bracket as an example, as shown in Figure 2, the flexible scale shell bracket 2 is fixed by hexagon socket head cap screws 7, elastic washers 6, and nuts 8 On the ruler shell 5. There is a guide groove 17 on the scale shell 5, and the nut 8 can be put into it. Since the dimensions of the nut 8 and the guide groove 17 match in the width direction, when the hexagon socket head cap screw 7 is turned, the nut 8 will not rotate. In this way, the hexagon socket head cap screw 7 and the nut 8 will be tightly connected by threads. The elastic washer 6 will strengthen this connection, so that the flexible scale shell support 2 is permanently and effectively fixed on the scale shell 5 . There is a flexible support positioning surface 9 in the direction that the flexible scale shell support 2 is close to the component to be measured, which corresponds to the left side 18 of the scale shell 5. When the flexible scale shell support 2 is fixed on the component to be measured, the flexible support The positioning surface 9 and the left side 18 of the scale housing 5 will be in close contact with the component to be measured.

As shown in FIG. 3 , the flexible scale housing support 2 has a through hole 10 for inserting the bolt 4 for flexible connection, and a plurality of grooves 19 on both sides thereof facilitate its mobility when the temperature changes. As shown in Figure 4, both sides of the flexible scale shell support 2 have symmetrical counterbores, namely the first counterbore 11 and the second counterbore 12, which are used to insert hexagon socket head cap screws 7 to fix the flexible scale shell support 2 on the scale shell 5 superior.

As shown in Figure 5, the structural schematic diagram of the rigid scale shell support 1 is different from the flexible scale shell support 2, and the pin hole 14 matched with the pin 3 is arranged in the middle. After the pin 3 is inserted, the rigid scale shell support 1 will be connected with the The measuring components are firmly connected, and there is no groove on the rigid scale shell bracket 1, so it will not move when the temperature changes. As shown in Figure 6, both sides of the rigid scale shell support 1 have symmetrical counterbores, namely the third counterbore 15 and the fourth counterbore 16, which are used to insert hexagon socket head cap screws 7 to fix the rigid scale shell support 1 on the scale shell 5 superior.

Claims (4)

1. the chi shell stationary installation of a grating scale, this device is made up of rigidity chi shell support (1) and multiple flexible chi shell supports (2), it is characterized in that, described rigidity chi shell support (1) is fixed on the centre position of chi shell (5), it is upper that described multiple flexible chi shell supports (2) are equidistantly fixed on chi shell (5), is placed in rigidity chi shell support (1) both sides and symmetrical; Pin hole (14) is set in the middle of described rigidity chi shell support (1), in the middle of described flexible chi shell support (2), through hole (10) is set, this flexibility chi shell support (2) also has groove (19) and is positioned at through hole (10) both sides and is symmetrical set; Described rigidity chi shell support (1) is near having in the direction of member to be measured and the corresponding rigid support locating surface (13) of chi shell (5) left surface (18); Described flexible chi shell support (2) is near arranging in the direction of member to be measured and the corresponding flexible support locating surface (9) of chi shell (5) left surface (18).

2. the chi shell stationary installation of a kind of grating scale according to claim 1, is characterized in that, longitudinal gathering sill (17) is set on described chi shell (5), and nut (8) is placed in gathering sill (17).

3. the chi shell stationary installation of a kind of grating scale according to claim 2, it is characterized in that, one side of described rigidity chi shell support (1) arranges the first counterbore (15), opposite side arranges the second counterbore (16), coordinate rigidity chi shell support (1) and chi shell (5) are fixed together by socket head cap screw (7) and nut (8), between socket head cap screw (7) and rigidity chi shell support (1), elastomeric pad (6) is set.

4. the chi shell stationary installation of a kind of grating scale according to claim 2, it is characterized in that, one side of described flexible chi shell support (2) arranges the 3rd counterbore (11), opposite side arranges the 4th counterbore (12), match flexible chi shell support (2) and chi shell (5) are fixed together by socket head cap screw (7) and nut (8), between socket head cap screw (7) and flexible chi shell support (2), elastomeric pad (6) is set.

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