Planetary wheel rotating tower structure

Abstract

The utility model provides a planet wheel rotary tower structure which comprises a sun wheel, planet wheels, a rotary tower and a structure base, and the rotary tower comprises a rotary tower base, a stepping motor and an encoder circuit board. The stepping motor is perpendicular to the turret base, an upper output shaft of the stepping motor is connected with an encoder shaft on the encoder circuit board, and a lower output shaft of the stepping motor is connected with the planet wheel through a gear and fixed to the turret base. And the sun gear is fixed on the structure base. The rotation angle of the turret is in one-to-one correspondence with the reading of the encoder, and the control system can obtain the real-time feedback of the rotation position of the turret according to the reading of the magnetic suspension encoder. According to the technical scheme, the requirements for precision and stability can be met, meanwhile, the price of the magnetic suspension encoder is relatively low, the support is simple in structure, and therefore the cost can be reduced by replacing an expensive encoder.

Description

Technical Field

[0001] The utility model relates to the field of experimental equipment and scientific instruments, in particular to a planetary wheel rotating tower structure. Background Art

[0002] A planetary gear train is an epicyclic gear train with only one degree of freedom. A planetary gear train is a coaxial transmission device (i.e. the output axis coincides with the input axis), and uses several identical planetary gears evenly distributed around the center wheel. Figure 1 The figure shows a turret structure, which is driven by a planetary gear and applied to a turret-type automatic sample feeder. The stepper motor is fixed on the chassis of the turret structure; the sun gear is fixed on the support. The stepper motor drives the planetary gear, carrying the turret to rotate around the sun gear fixed on the base in a single circle, and performs tasks at several fixed points. The prior art fixes an encoder on the top of the motor and fixes a grating code disk on the upper output shaft, or directly purchases a motor with an encoder and a driver, so that the control system of the equipment determines the movement position of the turret according to the encoder reading. Although this technical solution has high positioning accuracy and stability, the price of the motor with an encoder is relatively expensive, and the custom price of the grating code disk is also high, so the use of this solution requires relatively high costs. Another solution is to fix a radially magnetized magnet on the bottom output shaft of the motor driven by the turntable, and fix a magnetic suspension encoder on the base of the turntable to read the rotation angle of the turntable. However, in the planetary gear system, the base of the turntable cannot move with the motor. Summary of the invention

[0003] In order to solve the problems of the prior art, the utility model provides a planetary gear turret structure, including a sun gear, a planetary gear, a turret, and a structural base;

[0004] The turret includes a turret base, a stepper motor, and an encoder circuit board;

[0005] The stepper motor is arranged perpendicular to the turret base, the upper output shaft of the stepper motor is connected to the encoder shaft on the encoder circuit board, and the lower output shaft is connected to the planetary gear through a gear and fixed to the turret base; the sun gear is fixed to the structural base. Based on the above scheme, the turret also includes a fixed sleeve and a magnetized magnet;

[0006] The fixed sleeve is sleeved on the upper output shaft of the stepping motor;

[0007] When the stepping motor drives the turret to rotate around the structural base, the magnetized magnets installed radially rotate synchronously with the center of the motor as the axis.

[0008] On the basis of the above solution, the turret further includes a plurality of brackets, the encoder is mounted on the brackets, and the brackets are fixed above the stepping motor.

[0009] Based on the above solution, the encoder is a magnetic suspension encoder.

[0010] On the basis of the above solution, one end of the fixing sleeve is pressed into the upper output shaft of the stepping motor with an interference fit, and the other end is pressed into the magnetized magnet with an interference fit.

[0011] Beneficial effects of the utility model:

[0012] The rotation angle of the turret of the utility model corresponds to the reading of the encoder one by one, and the control system can obtain real-time feedback of the rotation position of the turret according to the reading of the magnetic suspension encoder. This technical solution can meet the requirements of accuracy and stability. At the same time, the price of the magnetic suspension encoder is relatively low, and the bracket can be obtained through 3D printing, thereby replacing the expensive encoder to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model has the following drawings:

[0014] Figure 1 A planetary gear turret structure in the prior art;

[0015] Figure 2 A planetary turret structure in a specific embodiment;

[0016] Figure 3 Planetary gear turret fixing sleeve structure;

[0017] Figure 4 Bracket structure diagram;

[0018] Figure 5 Three views of the bracket.

[0019] The marks in the above figure represent: 1—encoder; 2—magnetized magnet; 3—fixed sleeve; 4—bracket; 5—stepping motor; 6—planetary gear; 7—sun gear; 8—turret base; 9—structural base. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] As shown in the figure, a planetary gear turret structure includes a sun gear 7, a planetary gear 6, a turret, and a structural base 9. The turret includes a turret base 8, a stepper motor 5, an encoder 1, a fixing sleeve 3, and a magnetized magnet 2.

[0022] The sun gear 7 is fixed on the structural base 9, and the lower shaft of the stepper motor 5 carries the planetary gear 6 fixed on the turret base 8, driving the turret to rotate around the turntable base 8. Figure 3 As shown, the fixing sleeve 3 is pressed into the upper output shaft of the stepping motor 5 with an interference fit, and the radial magnetized magnet 2 is also pressed into the upper part with an interference fit. When the stepping motor 5 drives the turret to rotate around the turntable base 8, the radial magnetized magnet 2 rotates synchronously with the motor center as the axis.

[0023] It is recommended to add an enlarged picture of the details for better explanation.

[0024] The encoder 1 is mounted on a bracket 4, and the bracket 4 is fixed above a stepper motor 5, so that the encoder is fixed on the stepper motor 5, reads the magnetic pole direction of the rotating radial magnetized magnet 2 in real time, and calculates the rotation angle of the turret through a program algorithm.

[0025] It should be noted that the bracket 4 can be made of plastic.

[0026] like Figure 4 , 5 As shown, the bracket 4 is provided with four columns for fixing the encoder 1 , and the flange at the bottom is installed on the plane above the stepping motor 5 .

[0027] It should be noted that the encoder 1 uses a magnetic suspension encoder.

[0028] The above implementation modes are only used to illustrate the utility model patent, and are not limitations of the utility model patent. Ordinary technicians in the relevant technical field can make various changes and deformations without departing from the essence and scope of the utility model patent. Therefore, all equivalent technical solutions also belong to the scope of the utility model patent. The patent protection scope of the utility model patent should be limited by the claims.

[0029] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A planetary gear turret structure, comprising a sun gear, a planetary gear, a turret, and a structural base, characterized in that: The turret includes a turret base, a stepper motor, and an encoder circuit board; The stepper motor is arranged perpendicular to the turret base, the upper output shaft of the stepper motor is connected to the encoder shaft on the encoder circuit board, and the lower output shaft is connected to the planetary gear through a gear and fixed to the turret base; the sun gear is fixed to the structural base.

2. A planetary turret structure as claimed in claim 1, characterized in that: The turret also includes a fixed sleeve and a magnetized magnet; The fixed sleeve is sleeved on the upper output shaft of the stepping motor; When the stepping motor drives the turret to rotate around the structural base, the magnetized magnets installed radially rotate synchronously with the center of the motor as the axis.

3. A planetary turret structure as claimed in claim 1, characterized in that: The turret further comprises a plurality of brackets, the encoder is mounted on the brackets, and the brackets are fixed above the stepping motor.

4. A planetary gear turret structure as claimed in claim 1, characterized in that: The encoder is a magnetic suspension encoder.

5. A planetary turret structure as claimed in claim 2, characterized in that: One end of the fixing sleeve is pressed into the upper output shaft of the stepping motor by interference fit, and the other end is pressed into the magnetized magnet by interference fit.

Images