CN100464160C - An Absolute Composite Shaft Photoelectric Shaft Angle Encoder - Google Patents

Abstract

The utility model relates to an absolute indication composite shaft system photoelectric shaft angle encoder, which belongs to an encoder related to the technical field of photoelectric measurement. The technical problem to be solved by the present invention is to provide an absolute compound shafting photoelectric shaft angle encoder. The technical solutions for solving technical problems include flanges, casings, composite shafting, and reading heads. The main shaft is located at the symmetrical center of the encoder, the shaft sleeve is set on the main shaft, and the two are in rotational contact through bearings. The flange hollow shaft is installed on the outside of the shaft sleeve, and the flange hollow shaft is concentrically connected with the flange plate. A lock nut is installed on the gap between the lower end of the shaft sleeve and the flange hollow shaft to lock the shaft sleeve and the flange. The position of the blue hollow shaft. The casing covers the reading head and the composite shafting cover, and the lower end is fixedly connected with the flange with screws. When the encoder of this compound shaft system is installed with the main instrument, the "0" position of the encoder itself and the "0" position of the main instrument itself can be coincidently positioned at one time.

Description

An Absolute Composite Shaft Photoelectric Shaft Angle Encoder

1. Technical field

The invention belongs to an encoder related to the technical field of photoelectric measurement.

2. Background technology

The photoelectric shaft encoder is a representative angle measurement sensor, which has been widely used in technical fields such as industry, aerospace technology, and scientific experiments. Usually, the photoelectric shaft encoder is mostly a single shaft system, and the processing and manufacturing technology is relatively mature. The closest prior art with the present invention is the product developed by Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences. As shown in Figure 1, it includes a flange 1, a housing 2, a shafting system and a reading head. The shaft system mainly includes the main shaft 3, the bearing 4, and the shaft sleeve 5;

The main shaft 3 is located at the symmetrical center of the encoder, and one end of it protrudes from the center hole of the flange 1. The main shaft 3 and the sleeve 5 are in rotational contact with the bearing 4. The code disc 6 is set on the shoulder of the main shaft 3. The screw is fixedly connected and rotates with the main shaft 3, and the shaft sleeve 5 and the flange 1 are fixedly connected by screws; the light-emitting element 9 in the reading head is installed on the bracket connected with the shaft sleeve 5, and is located under the code disc 6. The base plate 7 is fixed on the shaft sleeve 5 by screws and located on the top of the code disc 6, and the receiving element 10 is installed at the hole of the base plate 7, so that the light-emitting element 9 and the receiving element 10 are located on the light path of the reading head. When the main shaft 3 drives the code disc 6 to rotate, relative motion occurs between the main shaft 3 and the slit 8 . When the light passes through the code track and slit of the code disc, the data read by the reading head records the angular displacement data of the measured object.

It is very difficult to adjust "0" when the photoelectric shaft encoder is connected with the main instrument.

Any kind of measurement has a certain base point, that is, "0" point. The "0" point of the instrument itself does not coincide with the "0" point of the space coordinates, and the difference between the two is called "0" position difference. During the measurement process, the "0" position difference should be limited within a certain range. When the encoder is installed on the main instrument, the "0" position of the encoder itself should coincide with the "0" position of the main instrument itself. It is time-consuming and labor-intensive to disassemble and assemble the fixed encoder, which is very difficult.

3. Contents of the invention

In order to overcome the defects existing in the prior art, the purpose of the present invention is to install the encoder on the main instrument in place once, without the need for secondary disassembly and fixation. Adjustable "0", specially designed a compound shaft encoder.

The technical problem to be solved by the present invention is to provide an absolute composite shafting photoelectric shaft angle encoder. The technical solution to solve the technical problem is shown in Figure 2: it includes a housing 11, a flange 12, a shafting system, and a reading head. The shaft system includes flange hollow shaft 13, lock nut 14, main shaft 15, bearing 16, elastic ring 17, shaft sleeve 18; the reading head includes code disc seat 19, support frame 20, receiving circuit board 21, receiving tube 22. Slit disc 23, luminous tube 24, luminous circuit board 25, substrate 26, code disc 27.

In the shaft system, the main shaft 15 is located at the symmetrical center of the encoder. A code disc seat 19 is installed on the upper end of the main shaft 15, and the two are fixedly connected by threaded fit. Under the code disc seat 19, the shaft sleeve 18 is set on the main shaft. 15, it is in rotational contact with the main shaft 15 through the bearing 16 to form the main shaft system; the flange hollow shaft 13 is set on the outside of the sleeve 18, and the lower end of the flange hollow shaft 13 is concentrically connected with the flange 12, in fact They are one piece, and the shaft sleeve 18 is in rotational contact with the flange hollow shaft 13. At the gap between the lower end of the shaft sleeve 18 and the bell mouth of the lower end of the flange hollow shaft 13, an elastic ring is set on the shaft sleeve 18. 17. A locking nut 14 is installed under the elastic ring 17, and the outer diameter of the locking nut 14 and the lower end of the axle sleeve 18 is threaded, which can lock the axle sleeve 18 and the flanged hollow shaft 13. Axle sleeve 18, flange 12, flange hollow shaft 13, and lock nut 14 form a fine-tuning shaft system; the combination of the main shaft system and the fine-tuning shaft system forms a composite shaft system; the flange 12 of the fine-tuning shaft system has "0" mark, this mark should coincide with the "0" mark of the main instrument itself.

In the reading head, the code disc 27 is installed on the code disc seat 19, and the two are fixedly connected. The code disc 27 rotates with the main shaft 15, and the upper end of the main shaft 15 is equipped with a base plate 26. The working surface of the base plate 26 is perpendicular to the main shaft 15. It passes Screws are fixedly connected on the shaft sleeve 18, a light-emitting tube 24 and a light-emitting circuit board 25 are installed at the band hole of the base plate 26, a support frame 20 is installed on the protruding part of the upper end of the shaft sleeve 18, and a support frame 20 is installed on the upper end surface of the support frame 20. The slit disk 23, the slit disk 23 and the code disk 27 above it are both parallel, and keep a certain gap. The lower end surface of the support frame 20 is equipped with a receiving circuit board 21 and a receiving tube 22, so that the luminous tube 24 and the receiving tube The tube 22 is located on the light path of the reading head. When the spindle 15 drives the code disc 27 to rotate, the slit disc 23 is relatively stationary, and a relative displacement occurs between the two. When light passes through the code disc and the slit, The reading head has a signal output and records the angular displacement data; the casing 11 covers the shafting and the reading head, and the lower end falls on the shoulder of the flange 12, and is fixedly connected to the flange 12 with screws.

The positive effect of the present invention: the fine-tuning shaft system in the shaft system can adjust the "0" position of the locking encoder to coincide with the "0" position of the main instrument. It solves the problem of repeated disassembly and assembly and adjustment of the "0" position during the installation process of the encoder to the main instrument in the prior art, saves time and effort, and greatly improves work efficiency.

4. Description of drawings

Fig. 1 is the structural representation of prior art absolute type single-shaft photoelectric shaft-angle encoder;

Fig. 2 is the structural representation of the absolute compound shaft system photoelectric shaft angle encoder of the present invention;

Fig. 3 is the schematic circuit diagram of the light-emitting circuit board 25 in the encoder of the present invention;

Fig. 4 is a schematic circuit diagram of the receiving circuit board 21 in the encoder of the present invention.

5. Specific implementation

The present invention is implemented by the structure shown in FIG. 2 . The flange 12, flange hollow shaft 13, lock nut 14, main shaft 15, shaft sleeve 18, code disc seat 19, support frame 20 and other parts are made of bearing steel Gr15; flange 12 and flange hollow shaft 13 is made into one piece; the material of the housing 11 is 2A12; the bearing 16 is a C-level or D-level standard deep groove ball bearing; the material of the elastic ring 17 is 65Mn; the receiving tube 22 is a triode, and the light-emitting tube 24 is an infrared diode. Honeywell products are used; the material of the slit disc 23 and the code disc 27 is K9 optical glass or polymer resin material, the distribution of the slits on the slit disc 23 and the layout of the code track on the code disc 27 and the arrangement of each part in the shafting The tolerance fit is set by the angle measurement accuracy requirements.

Claims (1)

1. an absolute type composite shaft system optical electric axial angle encoder comprises housing, ring flange, axle system, read head, it is characterized in that also comprising flange tubular shaft (13), set nut (14), resilient ring (17) in the axle system; Main shaft (15) is positioned at the symcenter position of scrambler in axle system, in the upper end of main shaft (15) encoder basement (19) is housed, be connected by threaded engagement between the two, below encoder basement (19), axle sleeve (18) is sleeved on the main shaft (15), it with main shaft (15) between rotate by bearing (16) and contact the formation axis system; At the outside of axle sleeve (18) suit flange tubular shaft (13), the lower end of flange tubular shaft (13) and concentric being connected of ring flange (12), be to rotate to contact between axle sleeve (18) and the flange tubular shaft (13), gap between the lower end hydraucone of the lower end of axle sleeve (18) and flange tubular shaft (13), be set with resilient ring (17) on the axle sleeve (18), set nut (14) is housed below resilient ring (17), between the external diameter of set nut (14) and axle sleeve (18) lower end is threaded engagement, axle sleeve (18) and ring flange (12), flange tubular shaft (13), set nut (14) has constituted fine setting axle system; The combination of main shaft system and fine setting axle system has formed composite shaft system; Have " 0 " mark on the ring flange (12) of fine setting axle system, " 0 " position mark of this mark and main body instrument self should overlap.

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