阅读说明：本技术 一种电机编码器 (Motor encoder ) 是由 张翠 张桂娣 郑雪凝 于 2019-01-07 设计创作，主要内容包括：本发明公开了一种电机编码器,其包括码盘、光电检测装置,所述码盘的盘面上设置有若干个光栅孔,所述光电检测装置的光电发射端和光电接收端分别置于所述码盘的两侧；在所述码盘与所述光电检测装置的光电接收端之间设置有遮光孔板,所述遮光孔板上设置有透光孔,所述透光孔正对所述光电接收端的信号接收位置,所述透光孔的孔径尺寸小于所述光栅孔。本发明的电机编码器可提高对电机的控制精度,结构紧凑,占用安装空间小,且便于集成安装和批量生产。(The invention discloses a motor encoder which comprises a code disc and a photoelectric detection device, wherein the disc surface of the code disc is provided with a plurality of grating holes, and a photoelectric emission end and a photoelectric receiving end of the photoelectric detection device are respectively arranged on two sides of the code disc; a shading pore plate is arranged between the code disc and a photoelectric receiving end of the photoelectric detection device, a light hole is arranged on the shading pore plate, the light hole is over against a signal receiving position of the photoelectric receiving end, and the aperture size of the light hole is smaller than that of the grating hole. The motor encoder can improve the control precision of the motor, has compact structure and small occupied installation space, and is convenient for integrated installation and batch production.)

1. A motor encoder, characterized by: the photoelectric detection device comprises a code disc and a photoelectric detection device, wherein a plurality of grating holes are formed in the disc surface of the code disc, and a photoelectric emitting end and a photoelectric receiving end of the photoelectric detection device are respectively arranged on two sides of the code disc; a shading pore plate is arranged between the code disc and a photoelectric receiving end of the photoelectric detection device, a light hole is arranged on the shading pore plate, the light hole is over against a signal receiving position of the photoelectric receiving end, and the aperture size of the light hole is smaller than that of the grating hole.

2. The motor encoder of claim 1, wherein: the photoelectric detection device comprises a photoelectric emission tube and a photoelectric receiving tube, the photoelectric emission tube or the photoelectric receiving tube is fixed to the end part of the motor through a fixing part, the middle part of the fixing part is provided with a shaft hole for the extension of a rotating shaft of the motor, and the coded disc is sleeved on the rotating shaft of the motor and rotates synchronously with the rotating shaft of the motor; the shading pore plate is fixed relative to the fixing part.

3. The motor encoder of claim 2, wherein: the photoelectric emission tube is fixed at the end part of the motor through the fixing part, and the photoelectric receiving tube is arranged on one side of the coded disc, which is far away from the fixing part.

4. A motor encoder in accordance with claim 3, wherein: the photoelectric receiving tube is fixed on the photoelectric receiving signal plate, and the photoelectric receiving signal plate is fixedly connected with the shading pore plate.

5. The motor encoder according to any one of claims 1-4, characterized in that: and the photoelectric receiving signal plate is provided with a receiving tube hole, and the photoelectric receiving tube is embedded into the receiving tube hole.

6. The motor encoder according to any one of claims 1-4, characterized in that: the photoelectric receiving tube is fixed on one side of the shading pore plate, which is far away from the coded disc, and is arranged right opposite to the light hole.

7. The motor encoder of claim 6, wherein: and a blind hole for embedded installation of the photoelectric receiving tube is formed in one side of the shading pore plate, which is far away from the code disc, and the blind hole and the grating hole are concentrically arranged.

8. The motor encoder of claim 5, wherein: the fixed part is the mounting panel, the face of mounting panel with motor shaft's axis is perpendicular, the transmitting tube hole has been seted up on the mounting panel, the embedded setting of photoelectric emission pipe is in the transmitting tube hole, photoelectric emission pipe's transmission direction is directional the photoelectric receiving tube.

9. The motor encoder of claim 8, wherein: the mounting plate is fixedly connected with the positive output terminal and the negative output terminal of the end part of the motor.

10. The motor encoder of claim 9, wherein: a plurality of contact pins perpendicular to the surface of the mounting plate are arranged on one side of the mounting plate, which is far away from the motor, the plurality of contact pins are arranged outside the orthographic projection of the coded disc on the mounting plate, and the shading pore plate is fixedly connected with the mounting plate through the contact pins; or the coded disc is arranged between the positive output terminal and the negative output terminal of the motor, and the shading pore plate is fixedly connected with the positive output terminal and the negative output terminal of the motor.

11. The motor encoder of claim 10, wherein: the photoelectric detection device at least comprises two pairs of photoelectric emission tubes and photoelectric receiving tubes.

Technical Field

The invention relates to the technical field of pipettors, in particular to a motor encoder.

Background

The pipettor can perform operations such as liquid removal and distribution, and is one of the most commonly used instruments in laboratories and instruments most likely to influence experimental results, and therefore, higher precision requirements are required. The principle that the electron pipettor realized is by motor drive, through transmission assembly, it moves to drive the piston straight line, thereby realize moving the liquid function, it is the prerequisite condition of guaranteeing to move the liquid precision that very obviously how to obtain the location of motor, in fact, in other large equipment technical field, it is a very mature technique to acquire the motor location through the encoder, however, the pipettor is as a hand-held type equipment, for guaranteeing operator's the sense of gripping, there is very harsh requirement to the appearance of instrument, and the electron pipettor is inside must be integrated with the motor, the battery, drive mechanism, key spare parts such as display screen, its inner space is and limited, current encoder structure is difficult to use in the pipettor.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of the existing pipettor, and further provide an encoder which improves the pipetting precision, has good compactness and is convenient for integration and batch production.

In order to achieve the purpose, the invention adopts the following technical scheme:

a motor encoder comprises a code disc and a photoelectric detection device, wherein the disc surface of the code disc is provided with a plurality of grating holes, and a photoelectric emitting end and a photoelectric receiving end of the photoelectric detection device are respectively arranged on two sides of the code disc; a shading pore plate is arranged between the code disc and a photoelectric receiving end of the photoelectric detection device, a light hole is arranged on the shading pore plate, the light hole is over against a signal receiving position of the photoelectric receiving end, and the aperture size of the light hole is smaller than that of the grating hole.

Preferably, the plurality of grating holes are circularly arranged, the photoelectric detection device comprises a photoelectric emission tube and a photoelectric receiving tube, the photoelectric emission tube or the photoelectric receiving tube is fixed to the end part of the motor through a fixing part, a shaft hole for extending a rotating shaft of the motor is arranged in the middle of the fixing part, and the code disc is sleeved on the rotating shaft of the motor and synchronously rotates with the rotating shaft of the motor; the shading pore plate is fixed relative to the fixing part.

Preferably, the photoelectric emission tube is fixed at the end of the motor through the fixing part, and the photoelectric receiving tube is arranged at one side of the code disc far away from the fixing part.

Preferably, the photoelectric receiving tube is fixed on a photoelectric receiving signal plate, and the photoelectric receiving signal plate is fixedly connected with the shading hole plate.

Preferably, the photoelectric receiving signal plate is provided with a receiving tube hole, and the photoelectric receiving tube is embedded in the receiving tube hole.

Preferably, the photoelectric receiving tube is fixed on one side of the shading pore plate, which is far away from the coded disc, and is arranged opposite to the light hole.

Preferably, a blind hole for installing the photoelectric receiving tube in an embedded manner is formed in one side, far away from the code wheel, of the light shielding hole plate, and the blind hole and the grating hole are arranged concentrically.

Preferably, the fixed part is the mounting panel, the face of mounting panel with motor shaft's axis is perpendicular, the transmitting tube hole has been seted up on the mounting panel, the embedded setting of photoelectric emission pipe is in the transmitting tube hole, photoelectric emission pipe's transmitting direction is directional the photoelectric receiving tube.

Preferably, the mounting plate is fixedly connected with the positive and negative output terminals of the end part of the motor.

Preferably, a plurality of contact pins perpendicular to the surface of the mounting plate are arranged on one side of the mounting plate, which is far away from the motor, the plurality of contact pins are all arranged outside the orthographic projection of the coded disc on the mounting plate, and the shading pore plate is fixedly connected with the mounting plate through the contact pins; or the coded disc is arranged between the positive output terminal and the negative output terminal of the motor, and the shading pore plate is fixedly connected with the positive output terminal and the negative output terminal of the motor.

Preferably, the photo-detection device comprises at least two pairs of photo-emission tubes and photo-reception tubes.

The invention has the beneficial effects that:

the motor encoder is characterized in that the photoelectric receiving tube is provided with a light shading hole plate, the light shading hole plate is arranged in front of the photoelectric receiving tube, and the light passing through the grating holes of the code disc can be received by the photoelectric receiving tube after passing through the small holes of the light transmitting hole, so that the number of the grating holes can be increased on the code disc with the same diameter, the precision is further improved, the structure of the motor encoder is arranged close to the end part of the motor, the assembly compactness is improved, the occupied mounting space is reduced, and the motor encoder is more convenient to integrate and mount and is more convenient for batch production.

Drawings

In order that the present invention may be more readily and clearly understood, reference is now made to the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic exploded view of an encoder of the present invention;

FIG. 2 is a schematic exploded view of another embodiment of the encoder of the present invention;

fig. 3 is a diagram of an optical signal detected by the photodetection device on the encoder of the present invention.

The reference numbers in the figures denote:

100-a motor; 101-code disc; 102-a stationary part; 103-a grating aperture; 104-a photoemissive tube; 105-a photoelectric receiving tube; 106-a rotating shaft; 107-axle hole; 108-a light-shielding pore plate; 109-light transmission holes; 110-a photoelectric receiving signal plate; 111-receiver tube aperture; 112-a transmitter aperture; 113-positive and negative output terminals; 114-kidney shaped hole; 115-pin, 116-blind hole.

Detailed Description

Referring to fig. 1, a motor encoder includes a code wheel 101, a photoelectric detection device and a fixing portion 102, a plurality of grating holes 103 are disposed on a disc surface of the code wheel 101, the plurality of grating holes 103 are circularly arranged, the photoelectric detection device includes a photoelectric emission tube 104 and a photoelectric receiving tube 105, the fixing portion 102 is used for fixing the photoelectric emission tube 104 to an end portion of the motor 100, a shaft hole 107 for extending a rotating shaft 106 of the motor 100 is disposed in a middle portion of the fixing portion 102, the code wheel 101 is disposed on a side of the fixing portion 102 away from the motor 100, the code wheel 101 is sleeved on the rotating shaft 107 of the motor 100 and rotates synchronously with the rotating shaft 107 of the motor 100, the photoelectric receiving tube 105 is disposed on a side of the code wheel 101 away from the fixing portion 102, and a light shielding hole plate 108 is disposed between the photoelectric receiving tube 105 and the code wheel 101, the light shading hole plate 108 is provided with a light hole 109, the light hole 109 faces the photoelectric receiving tube 105, the aperture size of the light hole 109 is smaller than that of the grating hole 103, and the light shading hole plate 108 is fixed relative to the fixing portion 102. The invention arranges the shading pore plate in front of the photoelectric receiving tube, so that the light passing through the grating hole of the code disc can be received by the photoelectric receiving tube after passing through the small hole of the light hole, thus increasing the number of the grating holes on the code disc with the same diameter, further improving the precision, and being structurally arranged close to the end part of the motor, improving the compactness of assembly, reducing the occupied installation space, and being more convenient for integrated installation and batch production.

The photo-receiving tube 105 of this embodiment is fixed on the photo-receiving signal plate 110, the photo-receiving signal plate 110 is fixedly connected to the light shielding hole plate 108, a receiving tube hole 111 is formed in the photo-receiving signal plate 110, and the photo-receiving tube 105 is embedded in the receiving tube hole 111. The installation thickness of the photoelectric receiving tube and the photoelectric receiving signal plate can be reduced by the arrangement mode, and the occupied space is reduced. Referring to fig. 2, in other embodiments, the photo receiving tube 105 may be directly fixed on a side of the light shielding hole plate 108 away from the code wheel 101 and disposed opposite to the light hole 109 (the light hole in fig. 2 is shielded, and the specific position is shown in fig. 1). A blind hole 116 for embedded installation of the photoelectric receiving tube 105 is formed in one side of the light shielding hole plate 108, which is far away from the code wheel 101, and the blind hole 116 and the grating hole 103 are concentrically arranged, so that the occupied installation space can be further reduced.

In this embodiment, the fixing portion 102 is a mounting plate, a plate surface of the mounting plate is perpendicular to an axis of the rotating shaft of the motor 100, the mounting plate is provided with a transmitting tube hole 112, the photoelectric transmitting tube 104 is embedded in the transmitting tube hole 112, and a transmitting direction of the photoelectric transmitting tube 104 points to the photoelectric receiving tube 105. The mounting panel with just, the negative output terminal fixed connection of motor 100 tip, be provided with two on the mounting panel and supply respectively motor 100 just, negative output terminal 113 male waist shape hole 114, motor 100 just, negative output terminal 113 inserts will behind the position adjustment targets in place in waist shape hole 114 the mounting panel with just, the negative output terminal 113 welded connection of motor is in order to reach fixed effect.

In the embodiment, two rows of contact pins 115 perpendicular to the surface of the mounting plate are arranged on one side of the mounting plate, which is far away from the motor 100, the two rows of contact pins 115 are arranged outside the orthographic projection of the code disc 101 on the mounting plate, the light shading pore plate 108 is fixedly connected with the mounting plate through the contact pins 115, so that the contact pins can play a role in electric connection to connect the photoelectric emission tube and the photoelectric receiving tube, and the mounting plate, the code disc, the light shading pore plate and the photoelectric receiving signal plate can be made of printed circuit boards. In other embodiments, the code wheel 101 may be disposed between the positive and negative output terminals 113 of the motor, and the light-shielding hole plate 108 is directly and fixedly connected with the positive and negative output terminals 113 of the motor.

The photoelectric detection device of the embodiment at least comprises two pairs of photoelectric emission tubes 104 and photoelectric receiving tubes 105, and the detection accuracy can be multiplied by adopting a plurality of photoelectric emission tubes and photoelectric receiving tubes under the same aperture.

The working principle of the invention is as follows: the code wheel is formed by equally opening a plurality of rectangular holes on a circular plate with a certain diameter. Because the photoelectric coded disc is coaxial with the motor, when the motor rotates, the coded disc and the motor synchronously rotate, and the detection device of the photoelectric emission tube (light-emitting diode) detects and outputs a plurality of pulse signals, the schematic diagram of the principle is shown in FIG. 3; the current rotating speed and the current running distance of the motor can be reflected by calculating the number of pulses output by the photoelectric encoder per second, so that the motor can be accurately positioned, and in addition, in order to judge the rotating direction, the coded disc can also provide A, B two-path pulse signals with the phase difference of 90 degrees.

The photosensitive element of the photoelectric receiving tube has a certain diameter size; the emission light of the emission tube is a scattering angle; if the grating hole on the code wheel is too large, the diameter of the hole is inevitably too small, and when the diameter of the grating hole is smaller than that of the receiving tube, the code wheel cannot completely cover the receiving element in the rotating process, and the rotation of the code wheel cannot generate an effective signal, so that the hole on the code wheel cannot be designed to be smaller than the beam diameter of the photoelectric emission tube. The photoelectric emission tube is used as a signal light source, and the emission of light rays has a certain scattering angle, so that the receiving tube can still receive partial light source signals in the process from non-shielding to complete shielding of the code wheel, which is not beneficial to the detection of the signals; the invention creatively arranges the light shading plate and the light shading hole, and the diameter of the small hole is smaller, so that only light rays transmitted along a straight line can be received by induction.

The present invention is not only applicable to electronic pipettors, but also to electric liquid handling devices including, but not limited to, electric suction aids, electric large capacity pipetting devices, pipette controllers, vial dispensers, vial pipetting devices, vial dispensers, continuous injectors, vacuum pipetting devices, liquid handling workstations, and the like.

The above embodiments are merely to explain the technical solutions of the present invention in detail, and the present invention is not limited to the above embodiments, and it should be understood by those skilled in the art that all modifications and substitutions based on the above principles and spirit of the present invention should be within the protection scope of the present invention.