A low-cost measurement method for the rotation angle of a servo turntable with a liftable table

Abstract

The present invention discloses a low-cost method for measuring the rotation angle of a servo turntable with a liftable table, which relates to the technical field of measuring the rotation angle of a turntable device. The servo turntable control system controls the turntable to rise, so that the angle measuring spline rotates together with the turntable; the infrared emitting diode in the reflective photoelectric sensor emits infrared light from the bright surface of the tooth top surface of the angle measuring spline to the light and dark surface of the tooth groove surface, and the electrical signal obtained by the reflective photoelectric sensor receiver changes from a high level to a low level. The receiver in the reflective photoelectric sensor transmits the changed electrical signal to the servo turntable control system; the servo turntable control system monitors the change of the electrical signal of the reflective photoelectric sensor, accumulates and calculates the number of changes of the high and low level electrical signals of the reflective photoelectric sensor, and then obtains the current angle value of the turntable according to the initial angle value of the turntable; the present invention has a simple structure and low cost, and can realize rough measurement of the rotation angle of the servo turntable.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring the rotation angle of a turntable device, and in particular to a low-cost measurement method for the rotation angle of a servo turntable with a liftable table. Background Art

[0002] The measurement of rotation angle is very important for the turntable structure. The existing angle measurement methods usually use circular gratings, circular induction synchronizers, magnetoelectric encoders, rotary transformers and other angle encoders for measurement. These methods are high-precision dynamic angle measurement methods, and they are all non-contact encoders with strict requirements on their installation spacing. For servo turntables that require a liftable table, reliable angle measurement cannot be achieved; and the encoders are all high-precision angle measurement. For products that only require rough angle feedback, their implementation cost is relatively high. Summary of the Invention

[0003] In response to the above technical problems, the present invention proposes a low-cost measurement method for the rotation angle of a liftable table servo turntable, comprising a liftable table servo turntable, the liftable table servo turntable is externally connected to a servo turntable control system, the liftable table servo turntable comprises a turntable fixed base, a rotating table is installed on the upper end of the turntable fixed base, an angle measuring spline is installed at the bottom of the turntable, the angle measuring spline is provided with a tooth top surface and a tooth groove surface, the tooth top surface is a bright surface, and the tooth groove surface is a light and dark surface; a reflective photoelectric sensor is installed in the upper end surface of the turntable fixed base; when measuring the rotation angle of the liftable table servo turntable, the method includes the following steps:

[0004] S1. Under the control of the servo turntable control system, the turntable is raised a distance H. At this time, the keyway of the goniometer spline is still within the working range of the reflective photoelectric sensor. The servo turntable control system drives the goniometer spline to rotate along with the turntable by controlling the motor.

[0005] S2. The infrared emitting diode in the reflective photoelectric sensor emits infrared light from the bright surface of the top surface of the goniometric spline tooth to the dark surface of the tooth groove surface. At this time, the electrical signal received by the reflective photoelectric sensor receiver changes from a high level to a low level. The receiver in the reflective photoelectric sensor transmits the changed electrical signal to the servo turntable control system.

[0006] S3. The servo turntable control system monitors the changes in the electrical signal of the reflective photoelectric sensor, accumulates and calculates the number of changes in the high and low level electrical signals of the reflective photoelectric sensor, and then obtains the current angle value of the turntable based on the initial angle value of the turntable to achieve the rotation angle measurement of the servo turntable.

[0007] Furthermore, the reflective photoelectric sensor includes a sensor body and a sensor mounting seat, the sensor mounting seat is mounted in the upper end surface of the turntable fixed base, and the sensor body is mounted on the sensor mounting seat.

[0008] Furthermore, the infrared emitting diode and the receiver in the sensor body are both aligned with the tooth top surface or the tooth groove surface in the angular spline.

[0009] Furthermore, the tooth groove surface is realized with a light or dark surface by black oxidation of the metal surface or spraying black paint.

[0010] Furthermore, the bottom end surface of the goniometric spline is flush with the upper end surface of the turntable fixed base or a gap is provided therebetween.

[0011] Furthermore, a rotating shaft is installed at the bottom of the central axis of the rotating table, and the rotating table and the rotating shaft are connected by screws.

[0012] Furthermore, the outer dimensions and number of teeth of the goniometric spline are changed according to the actual dimensions of the servo turntable, and the thickness of the goniometric spline is adjusted according to the required lifting height of the liftable table, and the lifting height does not exceed the thickness of the goniometric spline.

[0013] Furthermore, the angular spline is a rectangular tooth internal spline, the key width of the angular spline is equal to the slot width, the number of rectangular teeth is set to 180, and the angle corresponding to one tooth on the angular spline is 1°.

[0014] Furthermore, the rectangular tooth internal spline is replaced with an external spline. At this time, the reflective photoelectric sensor is installed perpendicular to the keyway surface outside the outer diameter range of the external spline.

[0015] Compared with the prior art, the present invention has the following advantages: (1) the present invention eliminates the angle encoder on the traditional servo turntable and adopts an angle spline and a reflective photoelectric sensor. The angle spline rotates with the servo turntable. The reflective photoelectric sensor can detect the angle change information after the angle spline rotates and transmit the changed electrical signal to the servo control system. The servo control system accurately obtains the angle of rotation of the servo turntable according to the number of electrical signal changes and the initial angle information of the turntable, performs accurate initial positioning, and achieves the purpose of low-cost servo turntable angle measurement with a liftable table; (2) the present invention has a simple structure and low manufacturing cost; (3) the present invention can accurately perform initial positioning. The present invention can more accurately locate the rotation angle of the turntable through the electrical signal changes of the angle spline and the reflective photoelectric sensor, and achieve rough angle measurement; (4) the present invention has variable size and broad application prospects, is not limited by the installation gap of the angle encoder, and can lift the table a certain distance; (5) the angle spline of the present invention can change the thickness as needed to achieve the change of the lifting height of the servo turntable, change the size and shape, and can be applied to all turntable devices that do not require high-precision angle measurement and require the table to be able to lift a certain distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of the structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 A top-down cross-sectional view of the center of a reflective photoelectric sensor.

[0018] Figure 3 The present invention is Figure 2 Schematic diagram of the local structure.

[0019] Figure 4 For the present invention Figure 1 Schematic cross-sectional view of the structure after the middle turntable is raised to a height of H.

[0020] Figure 5 This is a schematic cross-sectional view of another structure of the present invention.

[0021] Figure numbers: 1-rotating table, 2-angulating spline, 21-tooth top surface, 22-tooth groove surface, 3-reflective photoelectric sensor, 31-sensor body, 32-sensor mounting seat, 4-rotating table fixed base, 5-rotating axis. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0023] Example: Figure 1-Figure 5The invention discloses a low-cost measurement method for the rotation angle of a servo turntable with a liftable table, comprising a servo turntable with a liftable table, the servo turntable with a liftable table is externally connected to a servo turntable control system, the servo turntable with a liftable table comprises a turntable fixed base 4, a rotating table 1 is installed on the upper end of the turntable fixed base 4, and an angle measuring spline 2 is installed at the bottom of the rotating table 1. The angle measuring spline 2 is a rectangular tooth internal spline, the key width of the angle measuring spline 2 is equal to the slot width, the number of rectangular teeth is set to 180, and a The angle corresponding to each tooth is 1°; the angulating spline 2 is provided with a tooth top surface 21 and a tooth groove surface 22, the tooth top surface 21 is a bright surface, and the tooth groove surface 22 is a dark surface, and the dark surface of the tooth groove surface 22 is achieved by black oxidation of the metal surface or spraying black paint; the bottom end surface of the angulating spline 2 is flush with the upper end surface of the turntable fixed base 4 or a gap is provided (that is, not lower than the upper end surface of the turntable fixed base 4); a rotating shaft 5 is installed at the bottom of the central axis of the turntable 1, and the turntable 1 and the rotating shaft 5 are connected by screws.

[0024] A reflective photoelectric sensor 3 is installed in the upper end surface of the turntable fixed base 4, and the reflective photoelectric sensor 3 is installed within the inner diameter of the goniometric spline 2; the reflective photoelectric sensor 3 includes a sensor body 31 and a sensor mounting base 32, the sensor mounting base 32 is installed in the upper end surface of the turntable fixed base 4, and the sensor body 31 is installed on the sensor mounting base 32; the infrared emitting diode and receiver in the sensor body 31 are simultaneously aligned with the tooth top surface 21 or the tooth groove surface 22 in the goniometric spline 2.

[0025] The infrared light emitted by the infrared emitting diode in the reflective photoelectric sensor 3 will reflect the light when passing through the tooth top surface 21 of the angle measuring spline 2, and will be received by the receiver and converted into an electrical signal. If the light intensity received by the receiver is large, the electrical signal will be high after conversion, and if the light intensity received is small, the electrical signal will be low after conversion. The electrical signal will be transmitted to the servo turntable control system through a wire for counting processing.

[0026] When measuring the rotation angle of the servo turntable with a liftable table, the following steps are included:

[0027] S1. Under the control of the servo turntable control system, the turntable 1 is raised a distance H. At this time, the keyway of the goniometric spline 2 is still within the working range of the reflective photoelectric sensor 3. The servo turntable control system drives the goniometric spline 2 to rotate along with the turntable 1 by controlling the motor.

[0028] S2, the infrared emitting diode in the reflective photoelectric sensor 3 emits infrared light from the bright side of the tooth top surface 21 of the goniometric spline 2 to the dark side of the tooth groove surface 22. At this time, the electrical signal received by the receiver of the reflective photoelectric sensor 3 changes from a high level to a low level. The receiver in the reflective photoelectric sensor 3 transmits the changed electrical signal to the servo turntable control system;

[0029] S3. The servo turntable control system monitors the changes in the electrical signal of the reflective photoelectric sensor 3, accumulates and calculates the number of high and low level electrical signal changes of the reflective photoelectric sensor 3, and then obtains the rough angle value of the current turntable 1 based on the initial angle value of the turntable 1, thereby realizing low-cost private service turntable angle measurement.

[0030] The outer dimensions and number of teeth of the goniometer spline 2 can be changed according to the actual size of the servo turntable. At the same time, the rectangular tooth internal spline can also be replaced with an external spline. At this time, the reflective photoelectric sensor 3 is installed perpendicular to the keyway surface outside the outer diameter range of the external spline. The thickness of the goniometer spline 2 can also be adjusted according to the required lifting height of the lifting table, and the lifting height does not exceed the thickness of the goniometer spline 2.

Claims

1. A low-cost method for measuring the rotation angle of a liftable table servo turntable, comprising a liftable table servo turntable, the liftable table servo turntable being externally connected to a servo turntable control system, characterized in that: A servo turntable with a liftable table surface comprises a turntable fixed base (4), a rotating table (1) is mounted on the upper end of the turntable fixed base (4), an angle measuring spline (2) is mounted on the bottom of the turntable (1), a tooth top surface (21) and a tooth groove surface (22) are provided on the angle measuring spline (2), the tooth top surface (21) is a bright surface, and the tooth groove surface (22) is a light and dark surface; a reflective photoelectric sensor (3) is mounted in the upper end surface of the turntable fixed base (4); when measuring the rotation angle of the servo turntable with a liftable table surface, the method comprises the following steps: S1. Under the control of the servo turntable control system, the turntable (1) is raised by a distance H. At this time, the keyway of the angle measuring spline (2) is still within the working range of the reflective photoelectric sensor (3). The servo turntable control system drives the angle measuring spline (2) to rotate along with the turntable (1) by controlling the motor; S2, the infrared emitting diode in the reflective photoelectric sensor (3) emits infrared light from the bright side of the tooth top surface (21) of the angle measuring spline (2) to the dark side of the tooth groove surface (22). At this time, the electrical signal obtained by the receiver of the reflective photoelectric sensor (3) changes from a high level to a low level. The receiver in the reflective photoelectric sensor (3) transmits the changed electrical signal to the servo turntable control system; S3, the servo turntable control system monitors the change of the electrical signal of the reflective photoelectric sensor (3), calculates the number of changes of the high and low level electrical signals of the reflective photoelectric sensor (3), and then obtains the current angle value of the turntable (1) according to the initial angle value of the turntable (1), thereby realizing the rotation angle measurement of the servo turntable; The outer dimensions and the number of teeth of the goniometer spline (2) are changed according to the dimensions of the actual servo turntable, and the thickness of the goniometer spline (2) is adjusted according to the required lifting height of the liftable table, and the lifting height does not exceed the thickness of the goniometer spline (2); The angular measuring spline (2) is a rectangular tooth internal spline, the key width of the angular measuring spline (2) is equal to the slot width, the number of rectangular teeth is set to 180, and the angle corresponding to one tooth on the angular measuring spline (2) is 1°.

2. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 1, characterized in that: The reflective photoelectric sensor (3) comprises a sensor body (31) and a sensor mounting seat (32), wherein the sensor mounting seat (32) is mounted on the upper end surface of the turntable fixed base (4), and the sensor body (31) is mounted on the sensor mounting seat (32).

3. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 2, characterized in that: The infrared emitting diode and the receiver in the sensor body (31) are simultaneously aligned with the tooth top surface (21) or the tooth groove surface (22) in the angle measuring spline (2).

4. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 3, characterized in that: The tooth groove surface (22) is realized as a light or dark surface by black oxidation of the metal surface or spraying black paint.

5. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 4, characterized in that: The bottom end surface of the angle measuring spline (2) is flush with the upper end surface of the turntable fixed base (4) or is provided with a gap.

6. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 5, characterized in that: A rotating shaft (5) is installed at the bottom of the central axis of the rotating platform (1), and the rotating platform (1) and the rotating shaft (5) are connected via screws.

7. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 6, characterized in that: Replace the rectangular tooth internal spline with an external spline. In this case, the reflective photoelectric sensor (3) is installed perpendicular to the keyway surface outside the outer diameter range of the external spline.

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