Low-cost measurement method for rotation angle of servo turntable with liftable tabletop

Abstract

The invention discloses a low-cost measurement method for the rotation angle of a servo turntable with a liftable tabletop, and relates to the technical field of turntable device rotation angle measurement. A servo turntable control system controls a turntable to rise, so that an angle measurement spline rotates along with the turntable; infrared light emitted by an infrared emitting diode in the reflective photoelectric sensor is converted from a bright surface of a tooth top surface of the angle measurement spline to a dark surface of a tooth groove surface, and an electric signal obtained by a receiver of the reflective photoelectric sensor is converted from a high level to a low level; a receiver in the reflective photoelectric sensor transmits a changed electric signal to a servo turntable control system; the servo turntable control system accumulatively calculates the electrical signal change times of high and low levels of the reflective photoelectric sensor by monitoring the electrical signal change 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 device is simple in structure and low in cost, and the rotation angle of the servo turntable can be roughly measured.

Description

Technical Field

[0001] The invention relates to the technical field of measuring the rotation angle of a turntable device, and in particular to a low-cost measuring method for the rotation angle of a servo turntable with a liftable table surface. 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. Moreover, 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 view of the above technical problems, the present invention proposes 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, a rotating table is installed at the upper end of the turntable fixed base, an angle measuring spline is installed at the bottom of the turntable, a tooth top surface and a tooth groove surface are arranged on the angle measuring spline, 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 servo turntable with a liftable table, the following steps are included: S1. Under the control of the servo turntable control system, the turntable rises a distance H. At this time, the keyway of the angle measuring spline is still within the working range of the reflective photoelectric sensor. The servo turntable control system drives the angle measuring spline to rotate with the turntable by controlling the motor; S2, the infrared emitting diode in the reflective photoelectric sensor emits infrared light from the bright surface of the top surface of the angle measuring spline tooth to the dark surface of the tooth groove surface. At this time, 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; S3, the servo turntable control system monitors the changes in the electrical signals 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, thereby realizing the rotation angle measurement of the servo turntable.

[0004] 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.

[0005] Furthermore, the infrared emitting diode and the receiver in the sensor body are simultaneously aligned with the tooth top surface or the tooth groove surface in the angle measuring spline.

[0006] Furthermore, the tooth groove surface is realized by black oxidation of the metal surface or spraying black paint to achieve a light and dark surface.

[0007] Furthermore, the bottom end surface of the angle measuring spline is flush with the upper end surface of the turntable fixed base or a gap is provided.

[0008] Furthermore, a rotating shaft is installed at the bottom of the central axis of the rotating table, and the rotating table is connected to the rotating shaft by screws.

[0009] Furthermore, the outer dimensions and the number of teeth of the goniometric spline are changed according to the dimensions of the actual 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.

[0010] 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°.

[0011] Furthermore, the rectangular tooth internal spline is replaced with an external spline, and the reflective photoelectric sensor is installed perpendicular to the keyway surface outside the outer diameter range of the external spline.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (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 changes in the electrical signal and the initial angle information of the turntable, and performs accurate initial positioning, thereby achieving 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, thereby achieving 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 according to the need 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

[0013] Figure 1 It is a schematic cross-sectional view of the structure of the present invention.

[0014] Figure 2 For the present invention Figure 1 Cross-sectional view from above at the center of a reflective photoelectric sensor.

[0015] Figure 3 The present invention is Figure 2 Schematic diagram of the local structure.

[0016] 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.

[0017] Figure 5 It is a schematic cross-sectional view of another structure of the present invention.

[0018] Figure numbers: 1-rotating table, 2-angulometric 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

[0019] The present invention will be further described below in conjunction with 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.

[0020] Example: Figure 1-Figure 5 The invention discloses a low-cost measuring 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, 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 one of the angle measuring spline 2 The angle corresponding to each tooth is 1°; a tooth top surface 21 and a tooth groove surface 22 are provided on the angular spline 2, the tooth top surface 21 is a bright surface, and the tooth groove surface 22 is a light and dark surface, and the tooth groove surface 22 is realized by black oxidation of the metal surface or spraying black paint; the bottom end surface of the angular 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 rotating table 1, and the rotating table 1 is connected to the rotating shaft 5 by screws.

[0021] 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 range of the angle measuring spline 2; the reflective photoelectric sensor 3 includes a sensor body 31 and a sensor mounting seat 32, the sensor mounting seat 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 seat 32; 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.

[0022] 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, its electrical signal will be converted to a high level after conversion, and if the light intensity received is small, its electrical signal will be converted to a low level after conversion. The electrical signal will be transmitted to the servo turntable control system through a wire for counting processing.

[0023] When measuring the rotation angle of the servo turntable with a liftable table, the following steps are included: 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 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 surface of the tooth top surface 21 of the angle measuring spline 2 to the dark surface 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 changes in the electrical signal of the reflective photoelectric sensor 3, accumulates and calculates the number of changes in the high and low level electrical signals of the reflective photoelectric sensor 3, and then obtains the rough angle value of the current turntable 1 according to the initial angle value of the turntable 1, thereby realizing the angle measurement of the low-cost private service turntable.

[0024] The outer dimensions and number of teeth of the angle measuring 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 vertically to the keyway surface outside the outer diameter range of the external spline. The thickness of the angle measuring 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 angle measuring spline 2.

Claims

1. 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, characterized in that: A servo turntable with a liftable table top comprises a turntable fixed base (4), a turntable (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 arranged on the angle measuring spline (2), the tooth top surface (21) is a bright surface, and the tooth groove surface (22) is a 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 top, the following steps are included: 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 together 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 surface of the tooth top surface (21) of the angle measuring spline (2) to the dark surface of the tooth groove surface (22), at which time the electrical signal obtained by the receiver of the reflective photoelectric sensor (3) changes from a high level to a low level, and 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), accumulates and 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 measurement of the rotation angle of the servo turntable.

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); the sensor mounting seat (32) is mounted in 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 by black oxidation of the metal surface or spraying black paint to achieve a light or dark surface.

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 by 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: The outer dimensions and number of teeth of the angle measuring spline (2) are changed according to the dimensions of the actual servo turntable, and the thickness of the angle measuring 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 angle measuring spline (2).

8. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 7, characterized in that: 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 the angle corresponding to one tooth on the angle measuring spline (2) is 1°.

9. A low-cost measurement method for the rotation angle of a servo turntable with a liftable table as claimed in claim 8, 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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