CN214308812U - Encoder with stable reading - Google Patents

Abstract

The utility model belongs to the technical field of measuring device technique and specifically relates to an encoder that reading is stable is related to, it is including being used for rotating the grating dish that rotates together along with being surveyed, grating dish circumference evenly is equipped with a plurality of grid lines, still include more than two be used for with grating dish grid line matched with reading head and with all the processing module that the reading head electricity is connected, processing module is used for exporting the reading head signal that the reading is normal. This application can effectively reduce the encoder because of the pollution of grid line or the reading that the breakpoint appears is unusual, maintains the normal reading function of encoder.

Description

Encoder with stable reading

Technical Field

The application relates to the technical field of measuring devices, in particular to an encoder with stable reading.

Background

The encoder is a device which compiles and converts signals or data into a signal form which can be used for communication, transmission and storage, and can convert angular displacement into an electric signal so as to monitor the angular speed and the angular displacement of a measured piece.

In the related art, the encoder mainly comprises a shell, a main shaft rotationally connected to the shell, a grating disc arranged on the main shaft and a reading head arranged on the shell, wherein the main shaft is used for being connected with a measured rotating piece, and the main shaft and the grating disc also rotate along with the main shaft in the rotating process of the measured rotating piece; meanwhile, a plurality of grid lines are uniformly arranged on the grating disc in the circumferential direction, and the reading head is used for being matched with the grid lines of the grating disc, so that the purpose of detecting the detected rotating piece is achieved.

With respect to the related art in the above, the inventors consider that: the grid lines on the grating disk may be polluted or broken, which easily causes abnormal reading of the encoder in the actual use process, and affects the stability of the reading of the encoder.

SUMMERY OF THE UTILITY MODEL

In order to reduce the reading abnormity of the encoder caused by the pollution or the breaking point of the grid line, the application provides the encoder with stable reading.

The encoder with stable reading provided by the application adopts the following technical scheme:

the utility model provides a stable encoder of reading, is including being used for rotating the grating dish that rotates together along with being surveyed, grating dish circumference evenly is equipped with a plurality of grid lines, still include more than two be used for with grating dish grid line matched with reading head and with all processing module that the reading head electricity is connected, processing module is used for exporting the reading head signal that the reading is normal.

Through adopting above-mentioned technical scheme, by more than two reading heads to the grating disc along with being surveyed and rotate the grid line change of rotation in-process and cooperate the reading, can obtain to be surveyed and rotate the signal value that the rotation in-process more than two, because of the position that more than two reading heads were located is not overlapped, if there is pollution or breakpoint in a grid line of grating disc, when one of them reading head appearance reading is unusual, at least one reading head can normal reading in addition, recycle processing module and export the reading head signal that the reading is normal, effectively reduce the reading that the encoder appears because of the pollution or the breakpoint of grid line unusual, maintain the normal reading function of encoder.

Optionally, the number of the grid lines is an integral multiple of the number of the reading heads, and more than two reading heads are circumferentially and uniformly distributed around the rotation axis of the grating disk.

Through adopting above-mentioned technical scheme, evenly arrange the reading head, be convenient for make the cooperation state between every reading head and the grid line be corresponding the form.

Optionally, there are two of the read heads.

By adopting the technical scheme, under the condition that the number of the reading heads is abnormal due to pollution or breakpoints of the grid lines of the encoder is reduced, the number of the reading heads is two, and the cost and the difficulty in the production and manufacturing process of the encoder can be reduced.

Optionally, the device further comprises a shell and a spindle which is rotatably connected to the shell and used for connecting with the measured rotating part, and the reading head is fixedly connected to the shell; the center of the grating disc is provided with a sleeve hole which can be sleeved on the main shaft; the diameter of the sleeving hole is larger than that of the main shaft, and a connecting assembly is arranged between the grating disc and the main shaft.

By adopting the technical scheme, due to the difference of actual processing technologies, the sleeving holes formed in the grating disc may have certain eccentric conditions; the diameter of the sleeve hole is larger than that of the main shaft, so that the position of the grating disc can be properly adjusted, the grating disc and the main shaft are fixed relatively by the connecting component after the grating disc and the main shaft are concentric, and the reading obtained by the encoder in the rotating process of the measured rotating piece can be more accurate.

Optionally, a positioning element for abutting and positioning the grating disk along the axial direction of the main shaft is arranged on the main shaft.

By adopting the technical scheme, the positioning piece is arranged, so that the grating disk can be positioned on the main shaft in the axial direction conveniently.

Optionally, the connecting assembly includes a connecting glue disposed between the positioning member and the grating disk.

By adopting the technical scheme, the connecting glue is coated on the surface of the positioning piece facing the grating disc, when the grating disc is positioned by the positioning piece in an abutting mode, the connecting glue is still in a viscous state which is not dry, and the position of the grating disc can be adjusted at the moment so that the grating disc and the main shaft are fixed concentrically.

Optionally, the connecting assembly includes a convex ring arranged on the grating disc and more than three positioning studs arranged on the periphery of the convex ring, the convex ring is sleeved on the main shaft, and the diameter of the inner ring of the convex ring is larger than that of the main shaft; the convex ring is provided with a positioning screw hole in threaded connection with the positioning stud, the positioning screw hole penetrates from the outer annular wall of the convex ring to the inner annular wall of the convex ring, and one end, close to the main shaft, of the positioning stud is used for abutting against the side wall of the main shaft.

By adopting the technical scheme, after the positioning piece is utilized to axially position the grating disc on the main shaft, the positioning bolt can be enabled to extend into the end part of the inner ring of the convex ring to abut against the side wall of the main shaft by rotating the positioning stud, the main shaft is abutted tightly by utilizing more than three positioning studs, the concentricity between the grating disc and the main shaft can be conveniently adjusted, the relative fixation between the grating disc and the main shaft can be realized, and the effect of concentric fixation between the grating disc and the main shaft is finally achieved.

Optionally, thread glue is arranged between the positioning screw hole and the positioning stud.

Through adopting above-mentioned technical scheme, the thread glue after the setting and hardening can fill in the screw thread clearance between positioning screw hole and positioning stud, and can increase the stability of being connected between positioning stud and the positioning screw hole to reduce main shaft and grating dish and rotate the in-process positioning stud and rock and lead to the condition that grating dish rocked in the positioning screw hole.

Optionally, the end of the spindle may be exposed from the sleeve hole of the grating disk, an axial limiting assembly is disposed between the end of the spindle and the grating disk, the axial limiting assembly includes a snap spring and an elastic rubber ring, and the spindle is provided with a ring-shaped slot for the snap spring to be clamped into; the elastic rubber ring is sleeved on the main shaft and is positioned between the grating disc and the clamp spring.

By adopting the technical scheme, the clamp spring is clamped in the annular clamp groove, the elastic rubber ring is abutted to the surface of the grating disc by utilizing the clamp spring, and the grating disc is limited in the axial direction of the main shaft by matching with the abutting positioning function of the positioning piece on the grating disc, so that the condition that the grating disc moves along the axial direction of the main shaft is reduced.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the abnormal reading of the encoder caused by the pollution or the breakpoint of the grid line is effectively reduced, and the normal reading function of the encoder is maintained;

2. the position of the grating disk can be adjusted to ensure that the grating disk and the main shaft are concentrically fixed, so that the reading obtained by the encoder in the rotating process of the measured rotating piece is more accurate;

3. can keep the stable connection between grating dish and the main shaft for the encoder can carry out more accurate reading to the measured rotation piece.

Drawings

Fig. 1 is an overall schematic view of embodiment 1 of the present application.

Fig. 2 is a schematic cross-sectional view of embodiment 1 of the present application.

Fig. 3 is an exploded view of embodiment 1 of the present application.

Fig. 4 is a schematic view of the installation of the spindle and the grating disk in embodiment 1 of the present application.

FIG. 5 is a schematic view showing the mounting of the spindle and the grating disk in embodiment 2 of the present application

Description of reference numerals: 1. a housing; 11. a base body; 12. a housing; 121. mounting a plate; 2. a main shaft; 21. a positioning member; 22. an annular neck; 3. a grating disk; 31. sleeving a hole; 32. a convex ring; 321. positioning the screw hole; 4. a reading head; 5. a processing module; 6. connecting glue; 7. an axial limiting component; 71. a clamp spring; 72. an elastic rubber ring; 8. and positioning the stud.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

Example 1

The embodiment of the application discloses an encoder with stable reading. Referring to fig. 1 and 2, an encoder with stable reading includes a housing 1, a spindle 2 rotatably connected to the housing 1, a grating disk 3 fixedly connected to the spindle 2, two reading heads 4 installed in the housing 1 for cooperating with the grating disk 3, and a processing module 5 for outputting signals of the reading heads 4 with normal reading, wherein the housing 1 includes a fixed seat 11 and a fixed shell 12, and a cavity is formed in the housing 1 formed by connecting the seat 11 and the shell 12. The main shaft 2 is fixedly connected to the base body 11 through a bearing, one end of the main shaft 2 can be exposed out of the housing 1 and used for being connected to a rotating part to be tested, and meanwhile, the other end of the main shaft 2 extends into the housing 1. For example, when the end of the main shaft 2 exposed out of the housing 1 is connected with the rotating shaft of the motor, the housing 1 is fixedly connected with the motor casing of the motor.

Referring to fig. 2 and 3, the grating disk 3, the reading head 4 and the processing module 5 are all mounted in the housing 1; wherein, grating disc 3 is circular form, and a plurality of grid lines have evenly been seted up to grating disc 3 last circumference. The grating disk 3 is fixedly arranged on a rotating shaft in the shell 1, so that the grating disk 3 can rotate along with the rotation of the main shaft 2; specifically, the grating disk 3 is provided with a sleeve hole 31 capable of being sleeved on the spindle 2, and the diameter of the sleeve hole 31 is larger than that of the spindle 2, so that the position of the grating disk 3 can be properly finely adjusted, and the grating disk 3 and the spindle 2 form a concentric state.

Referring to fig. 2 and 4, a circular positioning member 21 is formed on the main shaft 2 in the housing 1; in the process of sleeving the grating disk 3 on the main shaft 2, the positioning piece 21 can abut and position the grating disk 3, so that the grating disk 3 can be positioned on the main shaft 2 in the axial direction. Meanwhile, a connecting assembly is further installed between the grating disc 3 and the main shaft 2, so that the grating disc 3 and the main shaft 2 are fixedly connected through the connecting assembly, and the main shaft 2 can drive the grating disc 3 to rotate synchronously.

In this embodiment, the connecting component is a connecting glue 6, and the connecting glue 6 is located between the positioning component 21 and the grating disk 3. In the actual fixing process, the connecting glue 6 can be coated on the surface of the positioning part 21 facing the grating disk 3, so that the grating disk 3 is abutted against the positioning part 21, the connecting glue 6 is in a viscous state, and the position of the grating disk 3 can be adjusted to enable the grating disk 3 to be fixed concentrically with the main shaft 2.

In addition, after the grating disk 3 is sleeved on the main shaft 2 and abutted against the positioning part 21, the end part of the main shaft 2 can be exposed out of the sleeving hole 31 of the grating disk 3, and the axial limiting component 7 is installed between the end part of the main shaft 2 and the grating disk 3. Specifically, the axial limiting component 7 includes a snap spring 71 and an elastic rubber ring 72, wherein the main shaft 2 is provided with an annular snap groove 22 for the snap spring 71 to be snapped in, the elastic rubber ring 72 is sleeved on the main shaft 2, and one side of the elastic rubber ring 72 abuts against the surface of the grating disc 3 far away from the positioning element 21. Meanwhile, after the snap spring 71 is clamped into the annular clamping groove 22, the side wall of the snap spring 71 can tightly support one side of the elastic rubber ring 72, which is far away from the grating disc 3, so that the effect of axially limiting the grating disc 3 is achieved.

Referring to fig. 2 and 3, the mounting plate 121 is installed to the inner wall of the housing 12, two reading heads 4 are fixedly installed on the mounting plate 121, and two reading heads 4 are used for being connected to the grating disk 3, and simultaneously, when the number of the grating lines on the grating disk 3 is an integral multiple of the number of the reading heads 4, that is, in this embodiment, when the number of the grating lines on the grating disk 3 is an even number, two reading heads 4 can be circumferentially and uniformly arranged along the rotation center of the grating disk 3, that is, two reading heads 4 are symmetrically arranged along the rotation center of the grating disk 3. Processing module 5 fixed mounting deviates from one side of reading head 4 in mounting panel 121, and mounting panel 121 all is connected with two reading heads 4 electricity, so that the reading of two reading heads 4 all can transmit to processing module 5 in, then utilize processing module 5 to carry out output to the reading head 4 signal that the reading is normal, effectively reduce the encoder because of the pollution or the breakpoint of grid line on grating dish 3 and the reading that appears is unusual, maintain the normal reading function of encoder. In this embodiment, the processing module 5 may select a single chip microcomputer as a main body.

The implementation principle of the encoder with stable reading in the embodiment of the application is as follows: the two reading heads 4 read the grid line change of the grating disk 3 along with the rotation process of the measured rotation piece, so as to obtain two signal values of the rotation process of the measured rotation piece. Because of the position that two reading heads 4 are located is the symmetry form, if there is pollution or breakpoint in a grid line of grating dish 3, when reading is unusual for one of them reading head 4, another reading head 4 can normal reading, recycle processing module 5 and export the reading head 4 signal that the reading is normal, can effectively reduce the encoder because of the pollution or the reading that the breakpoint of grid line appears unusually, maintain the normal reading function of encoder.

In addition, install grating disc 3 in the in-process of main shaft 2, carry out the butt location by setting element 21 to grating disc 3's axial position, then can finely tune grating disc 3's position so that grating disc 3 is concentric setting with main shaft 2 to realize the fixed connection between grating disc 3 and the setting element 21, realize the concentric fixed between grating disc 3 and the main shaft 2 promptly with the connecting glue 6 between grating disc 3 and the setting element 21. Meanwhile, the clamp spring 71 is used for abutting the elastic rubber ring 72 on the surface of the grating disc 3, and the positioning part 21 is matched with the abutting positioning effect on the grating disc 3, so that the grating disc 3 can be limited in the axial direction of the main shaft 2, the situation that the grating disc 3 moves along the axial direction of the main shaft 2 is reduced, and the reading of the encoder is more accurate.

Example 2

The embodiment of the application discloses an encoder with stable reading. Referring to fig. 4, the present embodiment is different from embodiment 2 in that: the connecting assembly has different structures, and specifically, the connecting assembly comprises a convex ring 32 formed on the grating disk 3 and positioning studs 8 on the periphery of four convex rings 32. The convex ring 32 can be sleeved on the main shaft 2, and the inner ring diameter of the convex ring 32 is larger than the diameter of the main shaft 2; in this embodiment, the inner diameter of the convex ring 32 is equal to the diameter of the coupling hole 31 of the grating disk 3. Meanwhile, four positioning screw holes 321 are uniformly formed on the peripheral side of the convex ring 32, and the positioning screw holes 321 penetrate from the outer annular wall of the convex ring 32 to the inner annular wall of the convex ring 32; the four positioning studs 8 are in one-to-one corresponding threaded connection and used for four positioning screw holes 321, and one ends of the positioning studs 8, which are close to the main shaft 2, are used for abutting against the side wall of the main shaft 2. In addition, in order to reduce the play between the positioning stud 8 and the positioning screw hole 321 due to the thread clearance, a thread compound is further provided between the positioning stud 8 and the positioning screw hole 321.

The implementation principle of the encoder with stable reading in the embodiment of the application is as follows: after the positioning piece 21 is used for axially positioning the grating disc 3 on the main shaft 2, the positioning bolt can be enabled to extend into the end part of the inner ring of the convex ring 32 to abut against the side wall of the main shaft 2 by rotating the positioning stud 8, the main shaft 2 is abutted tightly by utilizing more than three positioning studs 8, the concentricity between the grating disc 3 and the main shaft 2 can be conveniently adjusted, the relative fixation between the grating disc 3 and the main shaft 2 can be realized, and the effect of concentric fixation between the grating disc 3 and the main shaft 2 is finally achieved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. The utility model provides a stable encoder of reading, is including being used for rotating grating disk (3) together with the measured rotation piece, grating disk (3) circumference evenly is equipped with a plurality of grid lines, its characterized in that: the reading device is characterized by further comprising more than two reading heads (4) matched with grid lines of the grating disk (3) and a processing module (5) electrically connected with all the reading heads (4), wherein the processing module (5) is used for outputting signals of the reading heads (4) with normal reading.

2. A reading stabilized encoder according to claim 1, wherein: the number of the grid lines is integral multiple of the number of the reading heads (4), and more than two reading heads (4) are uniformly arranged in the circumferential direction around the rotating axis of the grating disc (3).

3. A reading stabilized encoder according to claim 1, wherein: the number of the reading heads (4) is two.

4. A reading stabilized encoder according to claim 1, wherein: the device is characterized by also comprising a shell (1) and a main shaft (2) which is rotatably connected to the shell (1) and used for being connected with a rotating part to be measured, wherein the reading head (4) is fixedly connected to the shell (1); a sleeve joint hole (31) capable of being sleeved on the main shaft (2) is formed in the center of the grating disc (3); the diameter of the sleeve joint hole (31) is larger than that of the main shaft (2), and a connecting assembly is arranged between the grating disc (3) and the main shaft (2).

5. An encoder as claimed in claim 4, wherein the encoder is configured to: and a positioning piece (21) for abutting and positioning the grating disc (3) along the axial direction of the main shaft (2) is arranged on the main shaft (2).

6. An encoder as claimed in claim 5, wherein the encoder is configured to: the connecting assembly comprises a connecting glue (6) arranged between the positioning piece (21) and the grating disc (3).

7. An encoder as claimed in claim 5, wherein the encoder is configured to: the connecting assembly comprises a convex ring (32) arranged on the grating disc (3) and more than three positioning studs (8) arranged on the peripheral side of the convex ring (32), the convex ring (32) is sleeved on the main shaft (2), and the diameter of the inner ring of the convex ring (32) is larger than that of the main shaft (2); the convex ring (32) is provided with a positioning screw hole (321) in threaded connection with the positioning stud (8), the positioning screw hole (321) penetrates from the outer ring wall of the convex ring (32) to the inner ring wall of the convex ring (32), and one end, close to the main shaft (2), of the positioning stud (8) is used for abutting against the side wall of the main shaft (2).

8. A reading stabilized encoder according to claim 7, wherein: and a thread rubber is arranged between the positioning screw hole (321) and the positioning stud (8).

9. An encoder as claimed in claim 5, wherein the encoder is configured to: the end part of the main shaft (2) can be exposed from the sleeve joint hole (31) of the grating disc (3), an axial limiting component (7) is arranged between the end part of the main shaft (2) and the grating disc (3), the axial limiting component (7) comprises a clamp spring (71) and an elastic rubber ring (72), and the main shaft (2) is provided with a ring-shaped clamp groove (22) for clamping the clamp spring (71); the elastic rubber ring (72) is sleeved on the main shaft (2), and the elastic rubber ring (72) is located between the grating disc (3) and the clamp spring (71).

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