CN212747839U - Modulation disk of split type angle encoder and installation assembly thereof - Google Patents

Abstract

The utility model relates to a modulation disk of a split type angle encoder, which is used for being installed on the shaft end surface of a rotating shaft, the external outline of the modulation disk is in a disc shape or a cylinder shape, and one of the circular end surfaces which is vertical to the axis of the modulation disk is used as the installation surface of the modulation disk; the modulation disc is also provided with a central hole penetrating through two circular end faces of the modulation disc, the cross section of the central hole is symmetrical about the center of the circle of the circular end face, and the inner side face of the central hole is used for being abutted and matched with a nut of an eccentric screw arranged on the end face of the shaft so as to adjust the eccentric amount between the axis of the modulation disc and the axis of the rotating shaft by rotating the eccentric screw; the circumference of encircleing the centre bore sets up a plurality of modulation dish mounting holes that supply the fastener to pass to can be fixed in the axle terminal surface through the fastener with the installation face on, the utility model discloses can improve the installation effectiveness and the installation accuracy of modulation dish greatly. The utility model discloses still relate to a split type angle encoder's modulation panel installation assembly.

Description

Modulation disk of split type angle encoder and installation assembly thereof

Technical Field

The utility model relates to an angle encoder design production technical field, in particular to split type angle encoder's modulation panel and split type angle encoder's modulation panel installation assembly.

Background

The encoder is a sensor which converts the geometric displacement on an output shaft into pulse or digital quantity by utilizing a photoelectric conversion effect, and has the characteristics of compact structure, strong stability, high precision and the like. The encoder with the error larger than +/-20 'is called a rotary encoder, the encoder with the error smaller than or equal to +/-20' is called an angle encoder, the angle encoder is widely applied to occasions with high accuracy and high angle resolution such as a numerical control rotary table, measuring equipment, an astronomical telescope, a gear measuring machine and the like, and the split type angle encoder has the advantages of small and exquisite structure, no built-in bearing, low rotational inertia and the like, so the split type angle encoder is popular among users. The split-type angle encoder generally comprises a modulation disc and a reading head, wherein the modulation disc is installed on a rotating shaft of a device to be measured (or called as an installation device), the reading head is installed on a fixed part of the device to be measured, the modulation disc comprises but is not limited to a grating modulation disc, a magnetic grating modulation disc and a gear modulation disc, and the modulation disc, the reading head and a light-emitting assembly are matched together to complete angle measurement.

In the equipment with high accuracy and high resolution requirement, the accuracy of the measuring system is a main index for measuring the performance of the equipment, and according to the error source, the main error source influencing the accuracy of the angle encoder is the eccentricity between the center of the modulation disk and the center of the rotating shaft of the equipment to be measured, taking the grating modulation disk as an example: the eccentricity e of the scribed center of the grating with the center of rotation of the device under test, which eccentricity e (in μm) has the following relationship to the measurement accuracy Δ ψ (in "): the formula shows that if the angular encoder is required to have higher accuracy, the eccentricity e between the scribing center of the grating and the rotation center of the device under test needs to be reduced as much as possible.

The grating of the angle encoder is generally divided into a steel drum grating and a glass grating, the steel drum grating (steel drum grating for short) is made of metal and generally cylindrical, and the grating scribing line is positioned on the outer side surface of the cylinder; glass gratings are typically in the form of a wafer with the grating scribe lines located on the circular end face of the wafer. The following first introduces the installation method of the current steel drum grating:

mode (1): referring to fig. 1, a reading head 01 is installed in an inner cavity of a motor housing, a rotating shaft conical surface 04 is arranged at an end portion of a rotating shaft, an installation disc protruding in the radial direction of the rotating shaft is arranged at the lower portion of the rotating shaft conical surface 04, a central hole of a steel drum grating 02 is a grating conical surface 05 matched with the rotating shaft conical surface 04, the steel drum grating 02 is sleeved on the rotating shaft so that the grating conical surface 05 is matched with the rotating shaft conical surface 04, and positioning screws 03 uniformly distributed in the circumferential direction of the steel drum grating 02 are screwed into the installation disc to press the steel drum grating 02 on the rotating shaft conical.

In the method, the steel drum grating 02 is fixed only by the friction force between the grating conical surface 05 and the rotating shaft conical surface 04, and the position of the grating is adjusted by using the torque of the positioning screw 03, so that the locking torque of the positioning screw 03 is limited, high locking torque cannot be used, and a spring washer cannot be used for preventing looseness, so that the friction force between the grating conical surface 05 and the rotating shaft conical surface 04 is limited, and in addition, the steel drum grating 02 has large moment of inertia, and the steel drum grating 02 is easy to displace when the steel drum grating is subjected to high-speed and high-acceleration or has certain impact vibration, so that the measurement precision of an angle encoder is changed;

mode (2): referring to fig. 2, a reading head 01 is installed in an inner cavity of a motor housing, a steel drum grating 02 is connected with a rotating shaft in an end face mode, a knocking device 06 is used for manually adjusting radial eccentricity of the grating (namely, eccentricity e between a scribing center of the grating and a rotating center of a device to be tested), and then the steel drum grating is fastened at the end of the rotating shaft through a positioning screw 03, however, manual knocking force is difficult to control, the error is large, the grating is easily damaged in a knocking process, a large amount of time is consumed in the knocking adjustment process, and installation efficiency is low; for the grating with larger installation depth, the knocking device 06 even has no layout space, and the eccentricity of the grating cannot be adjusted in a manual knocking mode;

then, the installation mode of the current glass grating is introduced:

the method comprises the following steps: referring to fig. 3, the grating 07 and the grating seat 08 form a grating assembly, the grating assembly is connected to the rotating shaft in an end-face connection manner, the radial eccentricity of the grating is manually adjusted by using a knocking device 06, and then the grating assembly is fastened to the end of the rotating shaft by a positioning screw 03, however, the same disadvantages exist in this manner as in the manner (2);

the method II comprises the following steps: referring to fig. 4, the grating 07 is directly assembled with the end surface of the rotating shaft, the fixed glue is used for bonding, the knocking device 06 is used for manually adjusting the radial eccentricity of the grating, and besides the same disadvantages of the first mode, the first mode also has the disadvantage that the grating is inconvenient to disassemble and replace;

the mode III is as follows: referring to fig. 5, the grating 07 and the grating seat 08 form a grating assembly, the grating seat 08 is sleeved on the periphery of the rotating shaft, the rotating shaft is provided with a supporting plate protruding in the radial direction, and the grating assembly is fastened on the supporting plate through a positioning screw.

The technical problem also exists in the installation process of other forms of chopper wheel.

Therefore, how to adjust the radial eccentricity of the chopper wheel quickly, accurately and conveniently in the installation process of the chopper wheel to ensure the measurement accuracy of the angle encoder is a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a split type angle encoder's modulation disk to can be quick, accurate and convenient adjustment modulation disk's radial eccentricity in the installation, thereby guarantee angle encoder measuring accuracy.

Another object of the present invention is to provide a split encoder for a chopper wheel assembly comprising the chopper wheel.

In order to achieve the above purpose, the utility model provides a split type angle encoder modulation disk, which is used for being arranged on the shaft end surface of a rotating shaft, wherein,

the outer contour of the modulation disk is in a disc shape or a cylinder shape, and one circular end face perpendicular to the axis of the modulation disk is used as a mounting surface of the modulation disk;

the modulation disc is also provided with a center hole penetrating through two circular end faces of the modulation disc, the cross section of the center hole is symmetrical about the center of the circle of the circular end face, and the inner side face of the center hole is used for being tightly matched with a nut of an eccentric screw arranged on the end face of the shaft in a propping manner so as to adjust the eccentric amount between the axis of the modulation disc and the axis of the rotating shaft by rotating the eccentric screw;

and a plurality of modulation disk mounting holes for the fasteners to pass through are formed in the circumferential direction around the central hole, so that the mounting surface can be fixed on the shaft end surface through the fasteners.

Preferably, the reticle is a grating reticle, a magnetic reticle or a gear reticle.

Preferably, in the reticle, the reticle is a grating reticle, the inner side surface of the central hole is provided with at least one pair of abutting surfaces for abutting and matching with a nut of the eccentric screw, and an included angle between two abutting surfaces in each pair of abutting surfaces in the circumferential direction is 180 °.

Preferably, in the reticle, a cross section of the central hole is circular, the abutting surfaces are flat surfaces, distances between any abutting surface and a center of the circular end surface of the grating are equal, and any abutting surface is perpendicular to a diameter of the circular end surface.

Preferably, in the reticle, at least one pair of adjustment grooves recessed toward an outer ring of the grating reticle is opened on an inner side surface of the center hole, and a groove bottom of the adjustment groove forms the abutting surface.

Preferably, in the above-mentioned reticle, the adjustment groove is U-shaped, and an arc-shaped transition edge is disposed at a corner position where the adjustment groove is connected to the central hole.

Preferably, in the above reticle, the abutting surface is a curved surface, a V-shaped surface, an inclined surface or a wavy surface.

Preferably, in the reticle, the grating reticle is a steel drum grating or a glass grating, and,

the steel drum grating is cylindrical, a middle cavity of the steel drum grating forms the central hole, and the bottom end face of the steel drum grating forms the mounting surface;

the glass grating includes:

the grating seat comprises a cylinder and a convex ring which is protruded on the side wall of the cylinder along the radial direction, the bottom surface of the convex ring is flush with the bottom surface of the cylinder, the hollow cavity of the cylinder forms the central hole, and the bottom surface of the convex ring and the bottom surface of the cylinder form the mounting surface together;

the annular grating body is sleeved on the barrel and is fixedly connected with the convex ring.

Preferably, the annular grating body is connected with the convex ring in an adhering mode.

The installation assembly of the modulation board disclosed in the utility model comprises an eccentric screw, a rotating shaft, a fastener and the modulation board disclosed in any one of the above items, wherein,

a plurality of shaft end mounting holes corresponding to the modulation disc mounting holes and at least one pair of position adjusting holes are formed in the shaft end surface of the rotating shaft, and the connecting line of the centers of any pair of position adjusting holes passes through the center of the rotating shaft;

the eccentric screw comprises a screw rod part and a screw cap connected with the screw rod part, the cross section of the screw cap is circular, an eccentric distance exists between the axis of the screw cap and the axis of the screw rod part, and the screw cap is at least provided with a non-circular operation part capable of driving the screw rod part to rotate;

the screw rod part is screwed in the position adjusting hole in a threaded manner, and the screw cap is tightly matched with the inner side surface of the central hole in a propping manner so as to adjust the eccentric amount between the axis of the grating and the axis of the rotating shaft by rotating the eccentric screw;

and the fastener passes through the mounting hole of the chopper wheel and then is screwed in the mounting hole of the shaft end so as to fix the mounting surface on the end surface of the shaft.

Preferably, in the above-described chopper wheel mounting assembly, a screw portion of one of the eccentric screws is a right-handed screw, and a screw portion of the other eccentric screw is a left-handed screw.

Preferably, in the chopper wheel mounting assembly, an eccentric screw having a right-hand thread and an eccentric screw having a left-hand thread are arranged at an interval in a circumferential direction of the shaft end surface.

Preferably, in the reticle mounting assembly, the operating portion is a polygonal operating portion protruding from a top of the nut, or the operating portion is a polygonal sunken groove formed in the top of the nut.

Preferably, in the above chopper wheel mounting assembly, the fastening member is a fastening screw.

Preferably, in the grating mounting assembly, an indicator for indicating a maximum eccentric position is further provided on a nut of the eccentric screw.

The utility model discloses a modulation disk for install on the axle terminal surface of rotation axis, a centre bore that runs through two circular terminal surfaces of modulation disk itself is seted up to this grating, and the medial surface of this centre bore can support tight cooperation with the nut of installing the eccentric screw on the axle terminal surface, and in the modulation disk installation, the eccentric screw on the rotation axis terminal surface can make the modulation disk produce the displacement to realize the axis of modulation disk (the ruling center of modulation disk promptly) with the regulation of the eccentricity between the axis of rotation axis, treat that the eccentricity reaches the requirement after, keep each eccentric screw motionless, then fix the installation face of modulation disk on the axle terminal surface through the fastener.

The chopper wheel has at least the following advantages:

the eccentric screw can be driven to rotate only by adopting a screw rotating tool (such as a T-shaped wrench) which occupies a small space, so that the eccentric amount between the axis of the modulation disk and the axis of the rotating shaft can be adjusted, compared with a knocking mode, the adjusting speed is obviously improved, and the assembling working time is greatly saved;

the screw rod of the eccentric screw adopts high-precision threads, and the modulation disc can be pushed to slightly move in the rotation process of the eccentric screw, so that the position of the modulation disc can be finely adjusted, the adjustment precision of the eccentric amount can be improved to a great extent, and the requirement of high measurement precision of an angle encoder by equipment can be met;

the eccentricity between the axis of the modulation disc and the axis of the rotating shaft can be adjusted without knocking, and the modulation disc cannot be damaged;

the chopper wheel is combined and positioned with the eccentric screw through the fastener, the positioning reliability is high, and the shock resistance and the vibration resistance of the chopper wheel are high.

The utility model discloses in the disclosed modulation board installation assembly of split type encoder, owing to adopted above-mentioned modulation board, therefore this modulation board installation assembly has the corresponding technical advantage of above-mentioned modulation board concurrently, and this is no longer repeated here.

Drawings

FIG. 1 is a schematic view of a first installation of a steel drum grating according to the prior art;

FIG. 2 is a schematic view of a second prior art mounting of a steel drum grating;

FIG. 3 is a schematic view of a first prior art mounting of a glass grating;

FIG. 4 is a schematic view of a second prior art mounting of a glass grating;

FIG. 5 is a schematic view of a third prior art mounting of a glass grating;

fig. 6 is a schematic front view of an eccentric screw according to an embodiment of the present invention;

FIG. 7 is a schematic view of the position relationship between the screw and the nut of the eccentric screw disclosed in FIG. 6;

FIG. 8 is a schematic view of a nut structure of the eccentric screw disclosed in FIG. 6;

FIG. 9 is a schematic diagram of a longitudinal cross-sectional structure of a steel drum grating according to an embodiment of the present invention;

FIG. 10 is a schematic top view of the steel drum grating disclosed in FIG. 9;

FIG. 11 is a schematic longitudinal cross-sectional view of a steel drum grating according to another embodiment of the present invention;

FIG. 12 is a schematic top view of the steel drum grating disclosed in FIG. 11;

FIG. 13 is a schematic longitudinal sectional view of a glass grating according to an embodiment of the present invention;

FIG. 14 is a schematic top view of the glass grating disclosed in FIG. 13;

FIG. 15 is a schematic longitudinal sectional view of a glass grating according to another embodiment of the present invention;

FIG. 16 is a schematic top view of the glass grating disclosed in FIG. 15;

fig. 17 is a schematic structural view of a mounting device disclosed in an embodiment of the present invention;

FIG. 18 is a schematic illustration of a steel drum grating as mounted on the mounting apparatus disclosed in FIG. 17;

FIG. 19 is a schematic view of the eccentric screw of FIG. 18 engaged with the abutment surface;

FIG. 20 is a schematic view of the eccentric screw and the clamping surface of FIG. 18 in one view;

FIG. 21 is a schematic view of the eccentric screw and the holding surface of FIG. 18 in another view;

FIG. 22 is a schematic view of a glass grating as mounted on the mounting apparatus disclosed in FIG. 17;

FIG. 23 is a schematic view of the eccentric screw of FIG. 22 engaged with the abutment surface;

FIG. 24 is a schematic view of the eccentric screw and the clamping surface of FIG. 22 in one view;

FIG. 25 is a schematic view of the eccentric screw and the clamping surface of FIG. 22 shown in an alternative view;

FIG. 26 is a schematic view of the mounting of a gear chopper wheel to a device under test;

FIG. 27 is a schematic longitudinal sectional view of FIG. 26;

FIG. 28 is a schematic view of the mounting of a magnetic grid chopper wheel on a device under test;

fig. 29 is a longitudinal sectional view of fig. 28.

The device comprises a grating, an eccentric screw, a fastener, a rotating shaft, an equipment body, a reading head, a T-shaped wrench, a T.

Detailed Description

One of the cores of the utility model is to provide a split type angle encoder's modulation disk to can be quick, accurate and convenient adjustment modulation disk's radial eccentricity in the installation, thereby guarantee angle encoder measuring accuracy.

The other core of the utility model is to provide a split type encoder's of including above-mentioned modulation dish installation assembly.

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

The utility model discloses a modulation disk of angle encoder for install on the axle head face of rotation axis, the external profile of modulation disk is disk form or cylindric, one of them circular terminal surface of the axis of perpendicular to modulation disk is as the installation face of modulation disk, still set up a centre bore that runs through two circular terminal surfaces of modulation disk on the modulation disk, and the cross sectional shape of this centre bore is central symmetry form about the centre of a circle of circular terminal surface, the medial surface of centre bore is used for supporting tight cooperation with the nut of the eccentric screw of installing on the axle head face, so that adjust the eccentricity between the axis of modulation disk and the axis of rotation axis through rotatory eccentric screw;

the modulation plate is provided with a plurality of modulation plate mounting holes in the circumferential direction around the central hole so that the mounting surface can be fixed on the shaft end surface through a fastener, the circumferential direction of the central hole is specifically the direction around the periphery of the central hole, and the circumferential track can be circular or non-circular.

It should be noted that, the split type angle encoder generally includes a modulation disc and a reading head, the modulation disc is installed on the rotating shaft of the device to be measured, the reading head is installed on the fixing member of the device to be measured, and the modulation disc, the reading head and the light emitting component cooperate together to complete the angle measurement. The reticle includes, but is not limited to, a grating reticle, a magnetic grating reticle and a gear reticle, wherein the grating reticle may be simply referred to as a grating in the embodiments of the present invention, and the external profile of the reticle is in a disc shape or a cylindrical shape, which does not mean that the external profile of the reticle is in a strict disc shape or a cylindrical shape, and a substantially disc shape and a substantially cylindrical shape also belong to the scope protected by the present invention, for example, the external profile of the gear reticle is in a substantially disc shape, but the outer circumference thereof has a saw-toothed structure formed by gears.

Use the grating as the example to right the utility model discloses introduce:

the grating of the split-type angle encoder disclosed in the utility model needs to be installed on the shaft end surface 43 of the rotating shaft 4 (the shaft end surface is perpendicular to the axis of the rotating shaft) in the practical application process, and is matched with the reading head 6 to jointly complete the measurement of the rotating angle of the rotating shaft 4, the outer profile of the grating 1 is generally disc-shaped or cylindrical, and those skilled in the art will understand that the disc-shaped and cylindrical gratings 1 are mainly different in that the dimension of the grating 1 in height (i.e. the distance between the two circular end faces) is different, the two circular end faces of the grating 1 are perpendicular to the axis of the grating 1 (i.e. the scribing centerline of the grating), one of the circular end faces is used as the mounting face 11 of the grating 1 when being mounted, of course, the mounting face 11 may be integrally attached to the shaft end face 43 in the actual mounting process, or a part of the mounting face 11 may be attached to the shaft end face 43;

the grating 1 is also provided with a central hole, the central hole penetrates through two circular end faces of the grating 1, the cross section shape (a surface obtained by cutting a surface vertical to the axis of the grating) of the central hole is centrosymmetric about the circle center of the circular end faces, optionally, the cross section of the central hole is a circle or a polygon or a figure formed by connecting the circle and the polygon, and the inner side surface of the central hole is used for abutting against and matching with nuts 22 of a plurality of eccentric screws 2 arranged on the end face 43 of the shaft, so that the eccentricity between the axis of the grating 1 and the axis of the rotating shaft 4 is adjusted by rotating the eccentric screws 2, and the purpose of improving the detection precision of the angle encoder is finally achieved;

in the grating 1, a plurality of grating mounting holes 14 (i.e., reticle mounting holes) are formed in a circumferential direction around the center hole, and the grating mounting holes 14 are used for allowing the fastening members 3 to pass through so as to fix the mounting surface 11 of the grating 1 to the shaft end surface 43 by the fastening members 3.

After understanding the above solution, those skilled in the art can easily know that when adjusting the eccentricity between the axis of the grating 1 and the axis of the rotating shaft 4, the eccentric screws 2 should be arranged in pairs, two eccentric screws 2 in each pair of eccentric screws 2 are responsible for the reciprocating adjustment of the eccentricity in one diameter direction, and as the number of the eccentric screws 2 increases, the adjusting direction of the grating 1 on the same plane is more precise, and the adjusting precision is higher.

The utility model discloses in respectively to steel drum grating and glass grating carry out the concrete explanation, please refer to fig. 9 to 12, steel drum grating divides two embodiment explanations:

example a

Referring to fig. 9 and 10, the outer profile of the steel drum grating is generally cylindrical, the central hole is formed in the middle cavity, the grating scribing surface 12 of the steel drum grating is located on the side surface of the cylinder, and the mounting surface 11 is formed on the bottom end surface of the steel drum grating; as can be seen from the figure, the cross section of the central hole of the steel drum grating in the embodiment is circular, and the circular inner side surface can be directly abutted and matched with the nut 22 of the eccentric screw 2; in order to further optimize the scheme, at least one pair of abutting surfaces 13 for abutting against the nut 22 of the eccentric screw 2 is arranged on the inner side surface of the central hole, and the included angle of two abutting surfaces 13 in each pair of abutting surfaces 13 in the circumferential direction is 180 degrees so as to ensure that the two abutting surfaces 13 are positioned on the same diameter; in this embodiment, the abutting surface 13 is a plane, two pairs of four abutting surfaces 13 are provided on the circular end surface of the grating 1, the diameters of the two pairs of abutting surfaces 13 are perpendicular to each other, the distance between each abutting surface 13 and the center of the circular end surface is equal, that is, H1 is H2-H3 is H4 in fig. 10, and any abutting surface 13 is perpendicular to the diameter of the circular end surface;

the grating mounting holes 14 are distributed on the periphery of the central hole, the number of the grating mounting holes 14 is not particularly limited, in this embodiment, four grating mounting holes 14 are specifically arranged, and the four grating mounting holes 14 are uniformly distributed in the circumferential direction of the central hole.

As a further optimization, the inner side surface of the central hole may be further provided with an adjusting groove recessed toward the outer ring of the grating 1, the bottom of the adjusting groove forms the abutting surface 13, as shown in fig. 10, the four abutting surfaces 13 are the bottoms of the four adjusting grooves, the cross-sectional shape of the adjusting groove may be U-shaped or trapezoidal, and in the actual processing process, the corner position where the adjusting groove is connected with the central hole may be set as an arc transition edge to avoid stress concentration; the function of the adjusting groove is mainly to facilitate the installation of the eccentric screw 2 and to accommodate the eccentric screw 2, so the cross section shape is not particularly limited as long as the cross section shape can achieve the above function;

it will be understood by those skilled in the art that besides a flat surface, a slant surface, a V-shaped surface, a wavy surface, etc. can be used as the abutting surface 13 to achieve the abutting fit with the nut 22 of the eccentric screw 2, and thus, the slant surface, the V-shaped surface, and the wavy surface can also be used as the abutting surface 13.

It should be noted that, although the function principle of the central hole is specifically described in the above embodiment by using a circular central hole, the cross-sectional shape of the central hole should not be limited to a circle, and actually, a central hole with other shapes such as a rectangle, a regular hexagon, a regular octagon, etc. may also function to cooperate with the eccentric screw 2 to adjust the eccentricity of the grating 1.

Example b

Referring to fig. 11 and 12, the steel drum grating in fig. 11 and 12 is the same as most of the features in embodiment a, and for the same features, the description of this embodiment is not repeated, and the following description mainly refers to the different technical features in embodiment b and embodiment a:

the central hole of the steel drum grating disclosed in embodiment b is circular, two pairs of four abutting surfaces 13 are provided, the inner side of the central hole is not provided with an adjusting groove, the two pairs of abutting surfaces 13 are planes directly connected with the inner side surface of the central hole, the diameters of the two pairs of abutting surfaces are perpendicular to each other, the distance between each abutting surface 13 and the center of the circular end surface is equal, that is, H1-H2-H3 in fig. 12 is H4, and any abutting surface 13 is perpendicular to the diameter of the circular end surface.

Referring to fig. 13 to fig. 16, the glass grating is illustrated in two embodiments:

example c

Referring to fig. 13 and 14, a glass grating specifically includes a grating seat 15 and an annular grating body 16, the annular grating body 16 is in a shape of a circular disc, a grating scribing surface 12 of the glass grating is located on a bottom surface of the annular grating body 16, the grating seat 15 includes a cylinder and a convex ring protruding from a side wall of the cylinder along a radial direction, a bottom surface of the convex ring is flush with a bottom surface of the cylinder, a hollow cavity of the cylinder forms the central hole, the bottom surface of the convex ring and the bottom surface of the cylinder together form the mounting surface 11, the annular grating body 16 is sleeved on the cylinder and fixedly connected with the convex ring, and a fixed connection mode between the annular grating body 16 and the convex ring is not limited and can be fixed and connected through a connecting piece or can be bonded; the central hole of the glass grating in the embodiment is circular, and the inner side surface of the circle can be directly abutted and matched with the nut 22 of the eccentric screw 2; in order to further optimize the scheme, at least one pair of abutting surfaces 13 for abutting against the nut 22 of the eccentric screw 2 is arranged on the inner side surface of the central hole, and the included angle of two abutting surfaces in the circumferential direction of each pair of abutting surfaces 13 is 180 degrees so as to ensure that the two abutting surfaces 13 are positioned on the same diameter; in this embodiment, the abutting surface 13 is a plane, two pairs of four abutting surfaces 13 are provided on the circular end surface of the grating 1, the diameters of the two pairs of abutting surfaces 13 are perpendicular to each other, the distance between each abutting surface 13 and the center of the circular end surface is equal, that is, H1-H3-H4 in fig. 14 are H2-H3, and any abutting surface 13 is perpendicular to the diameter of the circular end surface;

the grating mounting holes 14 are specifically formed in the grating base 15, the grating mounting holes 14 are distributed on the periphery of the central hole, the number of the grating mounting holes 14 is not specifically limited, and in the embodiment, four grating mounting holes 14 are specifically formed.

As a further optimization, the inner side surface of the central hole may be further provided with an adjusting groove recessed toward the outer ring of the grating 1, the groove bottom of the adjusting groove forms the abutting surface 13, as shown in fig. 14, the four abutting surfaces 13 are the groove bottoms of the four adjusting grooves, the cross-sectional shape of the adjusting groove may be U-shaped or trapezoidal, and in the actual processing process, the corner position where the adjusting groove is connected with the central hole may be set as an arc transition edge to avoid stress concentration; the function of the adjusting groove is mainly to facilitate the installation of the eccentric screw 2 and to accommodate the eccentric screw 2, so the cross section shape is not particularly limited as long as the cross section shape can achieve the above function;

it will be understood by those skilled in the art that besides a flat surface, a slant surface, a V-shaped surface, a wavy surface, etc. can be used as the abutting surface 13, so that the slant surface, the V-shaped surface, the wavy surface, etc. can also be used as the abutting surface 13.

It should be noted that, although the function principle of the central hole is specifically described in the above embodiment by using a circular central hole, the cross-sectional shape of the central hole should not be limited to a circle, and in fact, the central hole with other shapes such as a rectangle, a regular hexagon, a regular octagon, etc. may also function to cooperate with an eccentric screw to adjust the eccentricity of the grating.

Example d

Referring to fig. 15 and 16, most of the features of the glass grating in fig. 15 and 16 are the same as those in embodiment c, and for the same features, the description of this embodiment is not repeated, and the following description mainly refers to the different technical features of embodiment d and embodiment c:

the central hole of the glass grating disclosed in embodiment d is circular, two pairs of four abutting surfaces 13 are provided, no adjustment groove is provided inside the central hole, the two pairs of abutting surfaces 13 are both planes directly connected to the inner side surface of the central hole, the diameters of the two pairs of abutting surfaces 13 are perpendicular to each other, the distance between each abutting surface 13 and the center of the circular end surface is equal, that is, H1-H2-H3 in fig. 16 are H4, and any abutting surface 13 is perpendicular to the diameter of the circular end surface.

Next, the embodiment of the present invention will describe in detail the reticle mounting assembly of the split encoder, and also take the reticle mounting assembly as an example, the reticle mounting assembly includes the eccentric screw 2, the rotating shaft 4, the fastening member 3 and the reticle 1 disclosed in any one of the above embodiments, please first understand with reference to fig. 9 to 17, the end surface of the rotating shaft 4 is provided with the shaft end mounting hole 42 corresponding to the reticle mounting hole 14, both the reticle mounting hole 14 and the shaft end mounting hole 42 are matched with the fastening member 3, the shaft end surface 43 is further provided with at least one pair of position adjusting holes 41, the position adjusting holes 41 are used for mounting the eccentric screw 2, please refer to fig. 6 to 8, the eccentric screw 2 includes the screw rod portion 21 and the nut 22 connected to the screw rod portion 21, the cross section of the nut 22 is circular, so as to be capable of being tightly matched with the inner side of the central hole and also capable of realizing, an eccentricity e exists between the axis of the nut 22 and the axis of the screw part 21, at least one non-circular operating part 23 capable of driving the screw part 21 to rotate is arranged on the nut 22, referring to fig. 17 to 25, the rotating shaft 4 is rotatably arranged on the device body 5 through a bearing, the reading head 6 is arranged at a proper position of the device body 5, the grating 1 is arranged at the end part of the rotating shaft 4 through the grating mounting hole 14 and the fastening piece 3 screwed in the shaft end mounting hole 42, the fastening piece 3 can be a fastening bolt or a fastening screw, the screw part 21 of the eccentric screw 2 is screwed in the position adjusting hole 41, the nut 22 is abutted and matched with the inner side surface of the central hole, when the inner side surface of the central hole is provided with the abutting surface 13, the screw cap 22 is abutted and matched with the abutting surface 13 of the central hole, in the installation process, the amount of eccentricity between the axis of the grating 1 and the axis of the rotating shaft 4 is adjusted by rotating the eccentric screw 2.

In order to realize fine adjustment, the screw thread of screw portion 21 of eccentric screw 2 is the high accuracy screw thread (in the utility model discloses in, the high accuracy screw thread specifically indicates according to GB197-81, the tolerance zone level contains and is superior to 7 g's external screw thread), and correspondingly, should also set up the high accuracy screw thread with screw portion 21 adaptation on the position adjustment hole 41 inner wall.

The grating mounting assembly has at least the following advantages:

the eccentric screw 2 can be driven to rotate only by adopting a screw rotating tool (such as a T-shaped wrench) which occupies a small space, so that the eccentric amount between the axis of the grating 1 and the axis of the rotating shaft 4 can be adjusted, the adjusting speed is obviously improved compared with a knocking mode, and the assembling working hour is greatly saved;

the screw part 21 of the eccentric screw 2 is provided with high-precision threads, and the grating 1 can be pushed to slightly move in the rotating process of the eccentric screw 2, so that the fine adjustment of the position of the grating 1 is realized, the adjustment precision of the eccentric amount can be improved to a great extent, and the requirement of high measurement precision of an angle encoder by equipment can be met;

the eccentricity between the axis of the grating 1 and the axis of the rotating shaft 4 can be adjusted without knocking, and the grating cannot be damaged;

the grating is combined and positioned with the eccentric screw 2 through the fastener 3, the positioning reliability is high, and the impact resistance and the vibration resistance of the grating 1 are high.

In order to further improve the reliability of installation and positioning of the grating 1, the embodiment further optimizes the scheme in the embodiment, specifically, the screw part 21 of one part of the eccentric screws 2 is a right-handed thread, the screw part 21 of the other part of the eccentric screws 2 is a left-handed thread, and the screw part 21 with the right-handed thread and the screw part 21 with the left-handed thread can be locked with each other in the circumferential direction of the shaft end surface, so that the accidental rotation of the grating 1 is effectively prevented, and the positioning reliability of the grating 1 is greatly improved.

As a preferable mode, the eccentric screw 2 using the right-handed thread and the eccentric screw 2 using the left-handed thread are arranged at intervals in the circumferential direction of the shaft end surface, and as shown in fig. 19 and 23, four eccentric screws 2 are arranged in the order of the left-handed eccentric screw 2 a-the right-handed eccentric screw 2 b-the left-handed eccentric screw 2 a-the right-handed eccentric screw 2 b.

It should be understood that the specific form of the operating portion 23 is not limited, for example, the operating portion 23 may be a polygonal operating portion protruding from the top of the nut 22, or may also be a polygonal sunken groove formed in the top of the nut 22, in this embodiment, the operating portion 23 is specifically a polygonal sunken groove formed in the top of the nut 22, as shown in fig. 20 to 21 and fig. 24 to 25, the operating portion 23 may be a hexagon socket type operating portion, a flower type operating portion, etc., and for indicating the maximum eccentric position, in this embodiment, an indicating hole 24 for indicating the maximum eccentric position is further provided in the top of the nut 22.

The reticle mounting assemblies formed by the gear and grating reticles and the eccentric screws, rotary shafts and fasteners are identical in components and principles (the dimensions of the components may be different) except for the type of reticle itself, as shown in fig. 26-29, and those skilled in the art will understand the gear and grating reticle mounting assemblies with reference to the grating mounting assemblies.

By taking an optical grating installation assembly as an example, through practical operation verification, the installation method (1) for installing the optical grating on the steel drum in the background art takes 20 minutes for skilled workers to install, the installation accuracy error is 1 mu m, and the operation method is difficult to master; the installation of the steel drum grating in the installation mode (2) takes 30 minutes by skilled workers, the installation precision error is 5 mu m, and the operation mode is difficult to master;

the glass grating installation mode mentioned in the background art is characterized in that the time for installation is 30 minutes by skilled workers, the installation precision error is 5 micrometers, and the operation mode is difficult to master; the installation of the glass grating takes 30 minutes by skilled workers, the installation precision error is 4 mu m, and the operation mode is difficult to master; the installation method of the glass grating consumes 5 minutes for installation by skilled workers, the installation accuracy error is 20 microns, the operation method is easy to master, but the installation accuracy error is large.

In the grating installation assembly disclosed in the utility model, no matter be steel drum grating or glass grating, skilled worker all can control 10 minutes consuming time, and the installation accuracy mistake is 0.5 mu m, and the operating mode is mastered easily.

Therefore, the utility model discloses a modulation dish installation assembly can greatly improve installation effectiveness and installation accuracy.

Finally, the method for mounting the modulation board of the split-type angle encoder disclosed in the present invention is described, in this embodiment, the grating mounting is taken as an example for description, and the method for mounting the grating 1 disclosed in any one of the above embodiments is used for mounting on the rotating shaft 4 of the device to be tested, and firstly, the method for mounting the grating on the steel drum is described, please refer to fig. 18 to 21 first:

the installation method of the steel drum grating at least comprises the following steps:

screwing at least one pair of eccentric screws 2 (namely the number of the eccentric screws is an even number not less than 2) on the shaft end surface of the rotating shaft 4, enabling screw caps 22 of the eccentric screws 2 to be abutted against the inner side surface of a central hole of the grating 1, enabling the included angles of two eccentric screws 2 in any pair of the eccentric screws 2 in the circumferential direction to be 180 degrees, wherein each eccentric screw 2 comprises a screw rod part 21 and a screw cap 22 connected to the screw rod part 21, the cross section of each screw cap 22 is circular, an eccentric distance e exists between the axis of each screw cap 22 and the axis of the screw rod part 21, and the screw cap 22 is at least provided with a non-circular operating part 23 capable of driving the screw rod part 21 to rotate; then, the eccentric screw 2 is rotated by an operating tool (such as a T-shaped wrench), and the grating 1 is pushed to generate displacement through the nut 22;

when the eccentricity between the axis of the grating 1 and the axis of the rotating shaft 4 is not greater than the preset value, the eccentric screw 2 stops rotating, and the mounting surface 11 of the grating 1 is fixed on the shaft end surface 43 through the fastener 3.

Of course, before the adjustment of the eccentricity of the grating, the mounting surface 11 of the grating 1 is pre-mounted on the shaft end surface 43 by the fastening member 3.

It should be noted that the preset value can be flexibly set according to the requirement of actual installation accuracy, and the eccentricity between the axis of the grating 1 and the axis of the rotating shaft 4 can be monitored in real time through a detection device, which is a mature means in the field.

As can be seen from fig. 18 to 21, the depth of the installation cavity formed between the device body 5 and the rotating shaft 4 is large, and the operation space between the device body 5 and the rotating shaft 4 is very narrow, the grating installation method disclosed in the present case is particularly suitable for the installation occasion of the deep-well type cavity, and the eccentric amount can be accurately adjusted by driving the eccentric screw 2 to rotate through the cooperation of the T-shaped wrench and the operation part 23; in addition, the spanner arm of force of T type spanner is longer, during manual rotation, 2 rotatory angles of eccentric screw are far less than the rotatory angle of spanner, and this has just further improved the adjustment accuracy, and actual measurement discovers, adopts the embodiment of the utility model discloses grating installation method carries out the grating installation, and single assembly is about 5 minutes on average consuming time, and the error of eccentric amount is less than 2 mu m, compares in prior art, and the adjustment accuracy of eccentric amount has improved 5 ~ 10 times, and is consuming time to have reduced 4 ~ 5 times, has improved installation effectiveness and installation accuracy greatly.

It should be noted that the nut 22 actually has a certain height, the height of the nut 22 should not be too small or too large, the too small nut has insufficient height and strength, and cannot be tightly fit with the inner side surface of the central hole, and the too large nut height causes the nut 22 to protrude out of the surface of the grating 1, and occupies the internal space of the device to be tested; the specific height of the nut 22 should be adaptively adjusted according to the specific application, and the eccentricity e between the nut 22 and the screw portion 21, the roundness and the roughness of the nut 22 all need to be adaptively changed according to different adjustment requirements.

In the eccentric screw 2 adopted by the grating mounting method, the screw part 21 of one part of the eccentric screw 2 is the right-handed thread, the screw part 21 of the other part of the eccentric screw 2 is the left-handed thread, and the grating 1 is reliably positioned on the circumference of the shaft end surface 43 by the principle that the reverse threads are locked with each other; the locking action of the matching fastener 3 in the axial direction and the circumferential direction can prevent the optical grating 1 from loosening in the using process, and the optical grating can be applied to the environment with high rotating speed and certain impact and vibration.

Preferably, in the circumferential direction of the shaft end surface 43, the eccentric screw 2 adopting the right-hand thread and the eccentric screw 2 adopting the left-hand thread are arranged at intervals; in order to further improve the adjustment accuracy, a screw fastening agent is applied to the screw-threaded engagement portion between the screw portion 21 of the eccentric screw 2 and the shaft end surface 43, and the screw fastening agent can fill the gap between the high-accuracy screw and the screw portion 21, so that the screw portion 21 moves at a smaller pitch when rotated, and the problem of reverse rotation due to the screw gap after the screw portion is rotated to a corresponding position is solved.

Then, a glass grating mounting method is explained:

the installation method of the glass grating is the same as the installation method of the steel drum grating on the shaft end surface 43 except that the shape and structure of the glass grating are different from the shape and structure of the steel drum grating and the position of the grating scribing surface 12, but the fastening member 3 and the eccentric screw 2 are matched with the grating seat 15, so that the detailed installation method of the glass grating can be directly referred to the installation method of the steel drum grating disclosed in the above embodiment by those skilled in the art, and the detailed installation method of the glass grating will not be described repeatedly in this document. Other types of reticle mounting will be understood by those skilled in the art with reference to the grating mounting method.

It is right above that the utility model provides a split type angle encoder's modulation dish and installation assembly thereof have carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A reticle of a split type angle encoder for mounting on a shaft end surface of a rotary shaft,

the outer contour of the modulation disk is in a disc shape or a cylinder shape, and one circular end face perpendicular to the axis of the modulation disk is used as a mounting surface of the modulation disk;

the modulation disc is also provided with a center hole penetrating through two circular end faces of the modulation disc, the cross section of the center hole is symmetrical about the center of the circle of the circular end face, and the inner side face of the center hole is used for being tightly matched with a nut of an eccentric screw arranged on the end face of the shaft in a propping manner so as to adjust the eccentric amount between the axis of the modulation disc and the axis of the rotating shaft by rotating the eccentric screw;

and a plurality of modulation disk mounting holes for the fasteners to pass through are formed in the circumferential direction around the central hole, so that the mounting surface can be fixed on the shaft end surface through the fasteners.

2. The split angular encoder reticle of claim 1, wherein the reticle is a grating reticle, a magnetic grid reticle or a gear reticle.

3. The split-type angle encoder reticle of claim 2, wherein the reticle is a grating reticle, the inner side surface of the central hole is provided with at least one pair of abutting surfaces for abutting and matching with a nut of the eccentric screw, and an included angle between two abutting surfaces of each pair of abutting surfaces in the circumferential direction is 180 °.

4. The reticle of claim 3, wherein the cross section of the central hole is circular, the abutting surfaces are flat surfaces, and the distance between any abutting surface and the center of the circular end surface of the grating is equal, and any abutting surface is perpendicular to the diameter of the circular end surface.

5. The split-type angle encoder reticle of claim 4, wherein the inner side surface of the central hole is provided with at least one pair of adjustment grooves recessed toward the outer ring of the grating reticle, and the bottoms of the adjustment grooves form the abutting surface.

6. The chopper wheel of a split-type angle encoder of claim 3, wherein the abutting surface is a curved surface, a V-shaped surface, a slant surface or a wavy surface.

7. The reticle of the split-type angular encoder according to any one of claims 2 to 6, wherein the grating reticle is a steel drum grating or a glass grating, and,

the steel drum grating is cylindrical, a middle cavity of the steel drum grating forms the central hole, and the bottom end face of the steel drum grating forms the mounting surface;

the glass grating includes:

the grating seat comprises a cylinder and a convex ring which is protruded on the side wall of the cylinder along the radial direction, the bottom surface of the convex ring is flush with the bottom surface of the cylinder, the hollow cavity of the cylinder forms the central hole, and the bottom surface of the convex ring and the bottom surface of the cylinder form the mounting surface together;

the annular grating body is sleeved on the barrel and is fixedly connected with the convex ring.

8. A reticle mounting assembly of a split angular encoder comprising an eccentric screw, a rotating shaft, a fastener and a reticle according to any one of claims 1 to 7;

wherein the content of the first and second substances,

a plurality of shaft end mounting holes corresponding to the modulation disc mounting holes and at least one pair of position adjusting holes are formed in the shaft end surface of the rotating shaft, and the connecting line of the centers of any pair of position adjusting holes passes through the center of the rotating shaft;

the eccentric screw comprises a screw rod part and a screw cap connected with the screw rod part, the cross section of the screw cap is circular, an eccentric distance exists between the axis of the screw cap and the axis of the screw rod part, and the screw cap is at least provided with a non-circular operation part capable of driving the screw rod part to rotate;

the screw rod part is screwed in the position adjusting hole in a threaded manner, and the screw cap is in abutting fit with the inner side surface of the central hole so as to adjust the eccentricity between the axis of the modulation disk and the axis of the rotating shaft by rotating the eccentric screw;

and the fastener passes through the mounting hole of the chopper wheel and then is screwed in the mounting hole of the shaft end so as to fix the mounting surface on the end surface of the shaft.

9. The chopper wheel mounting assembly of a split-type angle encoder of claim 8, wherein a portion of the screw portion of the eccentric screw is right-handed threaded and another portion of the screw portion of the eccentric screw is left-handed threaded.

10. The chopper wheel mounting assembly of a split type angle encoder according to claim 9, wherein an eccentric screw with a right-hand thread and an eccentric screw with a left-hand thread are arranged at intervals in a circumferential direction of the shaft end surface.

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