A split-type optical encoder

Abstract

The present invention relates to a split-type photoelectric encoder, which comprises a circuit board, a rotating shaft, a code disc, a base and a fixing component. The fixing component includes a fixing ring sleeved inside the base, a wedge-shaped support block and a rotor. The fixing ring can drive the rotor to rotate on the base, so that the rotor is supported by the wedge-shaped support block on the base and changes its height. When the rotor is at the highest position, it abuts against the lower surface of the rotating shaft, ensuring the air gap between the code disc and the photoelectric conversion chip on the circuit board. The rotating shaft of the motor is fixed to the rotating shaft of the photoelectric encoder through a locking device, and then the rotor is rotated to the lowest position to work normally. This structure not only ensures safe and simple installation on site, but also ensures the air gap between the code disc and the photoelectric conversion chip on the circuit board. Compared with the integrated encoder, it is smaller in size, with the height reduced by about 15 mm, and is more suitable for the miniaturization requirements of servo equipment. The encoder body is made of plastic material and a pair of bearings are omitted, and the product cost is reduced by about 30%.

Description

Technical Field

[0001] The invention relates to the technical field of electronic measurement, and in particular to a split photoelectric encoder. Background Art

[0002] Photoelectric encoder is a sensor that converts the mechanical geometric displacement of the output shaft into pulses or digital quantities through photoelectric conversion. It is mainly used in various CNC equipment and is currently the most widely used sensor. Photoelectric encoder is mainly composed of a code disk and a photoelectric detection device. In the servo system, the code disk is coaxial with the motor so that the rotation of the motor drives the rotation of the code disk, and then the photoelectric detection device outputs a number of pulse signals. The current motor speed can be calculated based on the number of pulses per second of the signal. One of the core issues of incremental photoelectric encoders is to accurately ensure the air gap between the code disk and the photoelectric conversion chip on the circuit board. The integrated photoelectric encoder is the mainstream product in the current servo market. For the integrated encoder, due to the existence of upper and lower bearings, the shaft system size is easy to be fixed, but it has defects such as large size and high cost. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a split photoelectric encoder.

[0004] The present invention is achieved through the following technical solutions:

[0005] A split photoelectric encoder comprises a circuit board, a rotating shaft rotatably connected to the circuit board, a code disk fixed to the rotating shaft, and a base provided with a light-emitting tube, wherein the circuit board, the rotating shaft, the code disk and the middle part of the base are all provided with a rotating shaft channel, the middle part of the rotating shaft protrudes outward to form a connecting ring rib, and the connecting ring rib is upwardly fixedly connected with the code disk, and also comprises a fixing component, wherein the fixing component comprises a fixing ring sleeved inside the base, a group of wedge-shaped support blocks fixedly connected to the upper surface of the base, and a rotor with both ends passing through the fixing ring and slidably connected to the inner wall of the base, the upper surface of the fixing ring is fixedly connected to the circuit board, the rotor is arranged above the wedge-shaped support block, the rotor abuts against the lower surface of the rotating shaft, so that a gap is left between the upper surface of the code disk and the lower surface of the circuit board, and a locking device is arranged on the upper part of the rotating shaft.

[0006] According to the above technical solution, preferably, the rotor includes a rotating ring and support shafts symmetrically fixed to both sides of the rotating ring, rectangular holes are opened on both sides of the fixed ring, and the support shafts pass through the rectangular holes and are slidably connected to the inner wall of the base.

[0007] According to the above technical solution, preferably, a slideway is symmetrically opened on the inner wall of the base, one end of the support shaft passes through the rectangular hole and extends into the slideway, the slideway includes a first slide groove and a second slide groove connected to the first slide groove, and the first slide groove is higher than the second slide groove.

[0008] According to the above technical solution, preferably, four wedge-shaped support blocks are fixedly connected in the same direction to the upper surface of the base along the outer side of the shaft channel.

[0009] According to the above technical solution, preferably, the cross-section of the wedge-shaped support block parallel to the axis of the rotating shaft is a right-angled trapezoid.

[0010] According to the above technical solution, preferably, the locking device is a locking bolt.

[0011] The beneficial effects of the present invention are:

[0012] The fixing ring can drive the rotor to rotate on the base, so that the rotor is supported by the wedge-shaped support block on the base and changes its height. When the rotor is in the highest position, it rests against the lower surface of the rotating shaft, which not only ensures the air gap between the code disk and the photoelectric conversion chip on the circuit board, but also ensures the concentricity of the code disk and the photoelectric conversion chip. Insert the motor shaft into the shaft channel, fix the motor shaft and the rotating shaft of the photoelectric encoder through the locking device, and then rotate the rotor to the lowest position to work normally. This structural design ensures safe and easy installation on site and ensures the air gap between the code disk and the photoelectric conversion chip on the circuit board. Compared with the integrated encoder, it is small in size and about 15mm lower in height, which is more suitable for the miniaturization of servo equipment. The encoder body is made of plastic, and a pair of bearings are eliminated, reducing product costs by about 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a main structural schematic diagram of the present invention.

[0014] Figure 2 It is a three-dimensional structural schematic diagram of the base of the present invention.

[0015] Figure 3 It is a side structural schematic diagram of the fixing ring of the present invention.

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotor of the present invention.

[0017] In the figure: 1. rotating shaft, 2. rotating shaft, 3. locking bolt, 4. circuit board, 5. fixing ring, 6. connecting ring rib, 7. code disk, 8. light-emitting tube, 9. wedge-shaped support block, 10. rotor, 11. base, 12. rectangular hole, 13. first slide groove, 14. second slide groove. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiments.

[0019] As shown in the figure, the present invention includes a circuit board 4, a rotating shaft 1 rotatably connected to the circuit board 4, a code disk 7 fixed to the rotating shaft 1, and a base 11 provided with a light-emitting tube 8. The circuit board 4, the rotating shaft 1, the code disk 7 and the middle of the base 11 are all provided with a rotating shaft channel. The middle part of the rotating shaft 1 protrudes outward to form a connecting ring rib 6, and the connecting ring rib 6 is upwardly fixed with the code disk 7. It also includes a fixing component, which includes a fixing ring 5 sleeved inside the base 11, a group of wedge-shaped support blocks 9 fixed to the upper surface of the base 11, and a rotor 10 with both ends passing through the fixing ring 5 and slidably connected to the inner wall of the base 11. The upper surface of the fixing ring 5 is fixed to the circuit board 4, and the rotor 10 is arranged above the wedge-shaped support block 9. The rotor 10 abuts against the lower surface of the rotating shaft 1, so that a gap is left between the upper surface of the code disk 7 and the lower surface of the circuit board 4. A locking device is provided on the upper part of the rotating shaft 1, and the fixing ring 5 can To drive the rotor 10 to rotate on the base 11, so that the rotor 10 is supported by the wedge-shaped support block 9 on the base 11 and changes its height. When the rotor 10 is in the highest position, it abuts against the lower surface of the rotating shaft 1, which not only ensures the air gap between the code disk 7 and the photoelectric conversion chip on the circuit board 4, but also ensures the concentricity of the code disk 7 and the photoelectric conversion chip. The motor shaft 2 is inserted into the shaft channel, and the motor shaft 2 and the rotating shaft 1 of the photoelectric encoder are fixed by the locking device. Then the rotor 10 is rotated to the lowest position to work normally. This structural design ensures that it can be installed safely and easily on site, and ensures the air gap between the code disk 7 and the photoelectric conversion chip on the circuit board 4. Compared with the integrated encoder, it is small in size and the height is reduced by about 15mm, which is more suitable for the miniaturization of servo equipment. The encoder body is made of plastic, and a pair of bearings are omitted, and the product cost is reduced by about 30%.

[0020] According to the above embodiment, preferably, the rotor 10 includes a rotating ring and support shafts symmetrically fixed to both sides of the rotating ring, and rectangular holes 12 are opened on both sides of the fixed ring 5. The support shaft passes through the rectangular hole 12 and is slidably connected to the inner wall of the base 11. The height of the rectangular hole 12 is greater than the diameter of the support shaft, thereby ensuring that the rotor 10 moves up and down during rotation.

[0021] According to the above embodiment, preferably, the inner wall of the base 11 is symmetrically opened with a slide, one end of the support shaft passes through the rectangular hole 12 and extends into the slide, the slide includes a first slide groove 13 and a second slide groove 14 connected to the first slide groove 13, the first slide groove 13 is higher than the second slide groove 14, the first slide groove 13 is aligned with the bottom surface of the second slide groove 14, the first slide groove 13 is higher than the second slide groove 14, so that the rotor 10 is located on the upper part of the first slide groove 13 when it is in the highest position, and can slide into the second slide groove 14 when it rotates to the lowest position, thereby ensuring the precise movement of the rotor 10 in the slide.

[0022] According to the above embodiment, preferably, four wedge-shaped support blocks 9 are fixedly connected to the upper surface of the base 11 in the same direction along the outer side of the shaft channel, so that the rotor 10 is supported by the wedge-shaped support blocks 9 on the base 11 and changes its height, so as to ensure the gap between the code disk 7 and the photoelectric conversion chip on the circuit board 4.

[0023] According to the above embodiment, preferably, the cross-section of the wedge-shaped support block 9 parallel to the axis of the rotating shaft 1 is a right-angled trapezoid, and the direction from the first slide groove 13 to the second slide groove 14 is consistent with the direction from the highest point to the lowest point of the wedge-shaped support block 9, so that the rotor 10 moves on the inclined surface of the wedge-shaped support block 9 and changes its height, so as to ensure the air gap between the code disk 7 and the photoelectric conversion chip on the circuit board 4.

[0024] According to the above embodiment, preferably, the locking device is a locking bolt 3, a threaded hole is opened on the upper part of the rotating shaft 1, the rotating shaft 2 of the motor and the threaded hole on the rotating shaft 1 are opened with the same threaded hole, and the locking bolt 3 fixes the rotating shaft 2 of the motor and the rotating shaft 1 of the photoelectric encoder through a threaded connection.

[0025] The fixing ring 5 can drive the rotor 10 to rotate on the base 11, so that the rotor 10 is supported by the wedge-shaped support block 9 on the base 11 and changes its height. When the rotor 10 is in the highest position, it abuts against the lower surface of the rotating shaft 1, which not only ensures the air gap between the code disk 7 and the photoelectric conversion chip on the circuit board 4, but also ensures the concentricity of the code disk 7 and the photoelectric conversion chip. The motor shaft 2 is inserted into the shaft channel, and the motor shaft 2 is fixed to the rotating shaft 1 of the photoelectric encoder through the locking device. Then the rotor 10 is rotated to the lowest position to work normally. This structural design ensures that it can be installed safely and easily on site, and ensures the air gap between the code disk 7 and the photoelectric conversion chip on the circuit board 4. Compared with the integrated encoder, it is small in size and the height is reduced by about 15mm, which is more suitable for the miniaturization of servo equipment. The encoder body is made of plastic, and a pair of bearings are omitted, and the product cost is reduced by about 30%.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A split photoelectric encoder, comprising a circuit board, a rotating shaft rotatably connected to the circuit board, a code disc fixedly connected to the rotating shaft, and a base provided with a light-emitting diode. The circuit board, the rotating shaft, the code disc, and the middle part of the base are all provided with a rotating shaft channel. A connecting ring rib protrudes outward from the middle part of the rotating shaft. The connecting ring rib is fixedly connected upward with the code disc. Characterized in that, It further includes a fixing component. The fixing component includes a fixing ring sleeved inside the base, a group of wedge-shaped support blocks fixedly connected to the upper surface of the base, and a rotor passing through both ends of the fixing ring and slidably connected to the inner wall of the base. The upper surface of the fixing ring is fixedly connected to the circuit board. The rotor is arranged above the wedge-shaped support blocks. The rotor abuts against the lower surface of the rotating shaft, so that there is a gap between the upper surface of the code disc and the lower surface of the circuit board. A locking device is provided on the upper part of the rotating shaft. The fixing ring can drive the rotor to rotate in the base, so that the rotor is supported by the wedge-shaped support blocks and changes its height.

2. The split photoelectric encoder according to claim 1, Characterized in that, The rotor includes a rotating ring and support shafts symmetrically fixedly connected to both sides of the rotating ring. Rectangular holes are opened on both sides of the fixing ring. The support shafts pass through the rectangular holes and are slidably connected to the inner wall of the base.

3. The split photoelectric encoder according to claim 2, Characterized in that, Sliding grooves are symmetrically opened on the inner wall of the base. One end of the support shaft passes through the rectangular hole and extends into the sliding groove. The sliding groove includes a first sliding groove and a second sliding groove communicated with the first sliding groove. The first sliding groove is higher than the second sliding groove.

4. The split photoelectric encoder according to claim 1, Characterized in that, 4 wedge-shaped support blocks are fixedly connected to the upper surface of the base along the outside of the rotating shaft channel in the same direction.

5. The split photoelectric encoder according to claim 4, Characterized in that, The cross-section of the wedge-shaped support block parallel to the axis of the rotating shaft is a right trapezoid.

6. The split photoelectric encoder according to any one of claims 1 to 5, Characterized in that, The locking device is a locking bolt.

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