Absolute value encoder structure

Abstract

The utility model relates to the technical field of linear displacement sensors, in particular to an absolute value encoder structure, which comprises a guide rail, a magnetic railing ruler and a reading head, the reading head comprises a shell of which the upper end is open and one side is provided with a threading hole, a PCB (Printed Circuit Board) arranged in the shell, and a cover plate covering the opening of the shell, the shell is of a cuboid structure, and the bottom end of the shell is provided with a window; the guide rail comprises a bottom plate, vertical plates arranged at the two ends of the bottom plate, a polished shaft arranged between the vertical plates and a sliding seat arranged on the polished shaft in a sliding mode, the polished shaft is sleeved with the sliding seat, the lower end of the sliding seat corresponds to the upper end of the bottom plate, and the magnetic railing ruler is arranged at the upper end of the bottom plate and located between the vertical plates. And the reading head is fixed at the lower end of the sliding seat, and the window of the shell corresponds to the magnetic railing ruler. The design is simple in structure, stable in sliding and convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of linear displacement sensors, in particular to an absolute value encoder structure. Background Art

[0002] The measurement accuracy of the linear encoder depends on the accuracy of its magnetic or optical grating and the straightness of its installation. When the reading head moves, the sliding carriage part that senses the magnetic signal or photoelectric scanning signal needs to maintain a relatively stable position relative to the magnetic or optical grating when moving along the magnetic or optical grating.

[0003] The movement of the reading head mainly relies on the guide rail for support and guidance, and multiple sealing strips are added to prevent dust. The friction resistance during movement is large, and its movement trajectory is uncertain. In addition, the reading head structure and the guide rail structure are relatively complex, making production and assembly inconvenient and inefficient. Utility Model Content

[0004] In order to solve the above problems, the utility model provides an absolute value encoder structure, which has the advantages of simple structure, stable sliding and convenient assembly and disassembly.

[0005] The technical solution adopted by the utility model is to provide an absolute value encoder structure, including a guide rail, a magnetic scale and a reading head arranged on the guide rail, the reading head and the magnetic scale are spaced correspondingly, the reading head includes a shell with an opening at the upper end and a threading hole at one side, a PCB board arranged in the shell, and a cover plate covering the shell opening, the shell is a rectangular parallelepiped structure and a window is arranged at the bottom end of the shell; the guide rail includes a bottom plate, vertical plates arranged at both ends of the bottom plate, an optical axis arranged between the vertical plates and a slide seat slidably arranged on the optical axis, the slide seat is mounted on the optical axis and the lower end of the slide seat corresponds to the upper end of the bottom plate, the magnetic scale is arranged at the upper end of the bottom plate and is located between the vertical plates, the reading head is fixed to the lower end of the slide seat and the window of the shell corresponds to the magnetic scale.

[0006] The guide rail also includes a slide groove arranged on the bottom plate and a slide plate arranged at the lower end of the slide seat. The slide groove is arranged along the length direction of the bottom plate and is respectively located on both sides of the magnetic scale. The upper end of the slide plate is fixed to the slide seat and the lower end is embedded in the slide groove.

[0007] The slide groove is in the form of a dovetail groove structure, and the lower end of the slide plate is adapted to the dovetail groove.

[0008] The slide groove is a through groove, and a convex block adapted to the slide groove is arranged at the lower end of the vertical plate. The vertical plate is fixed on the bottom plate, and the convex block at the lower end of the vertical plate is embedded in the slide groove.

[0009] The guide rail also includes a raised long platform provided with an upper end of the bottom plate and located between the vertical plates, and the magnetic scale is provided on the raised long platform.

[0010] The upper end of the raised platform is provided with a mounting groove, and the magnetic scale is arranged in the mounting groove.

[0011] The beneficial effect of the utility model is that it provides an absolute value encoder structure, simplifies the structure of the reading head, has a small size, low cost, and is simpler to produce and assemble. The optical axis is used as a slide rail, and the slide seat is used as a moving trolley. The slide seat slides on the optical axis, and the resistance is smaller than that of an ordinary slide rail. The design adopts a reading head and guide rail structure with a simpler structure, and the sliding is stable and reliable, which not only reduces the complex operability during production and assembly, but also reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of the reading head.

[0014] In the attached drawings, 1, magnetic scale, 2, reading head, 3, housing, 4, PCB board, 5, cover plate, 6, window, 7, bottom plate, 8, vertical plate, 9, optical axis, 10, slide seat, 11, slide groove, 12, slide plate, 13, bump, 14, raised long platform, 15, mounting groove. DETAILED DESCRIPTION

[0015] like Figure 1-2 As shown, the utility model provides an absolute value encoder structure, including a guide rail, a magnetic scale 1 and a reading head 2 arranged on the guide rail, the reading head 2 and the magnetic scale 1 are spaced and corresponding, the reading head 2 includes a shell 3 with an opening at the upper end and a threading hole on one side, a PCB board 4 arranged in the shell 3, and a cover plate 5 covering the opening of the shell 3, the shell 3 is a rectangular parallelepiped structure and a window 6 is arranged at the bottom end of the shell 3; the guide rail includes a bottom plate 7, vertical plates 8 arranged at both ends of the bottom plate 7, an optical axis 9 arranged between the vertical plates 8 and a slide 10 slidably arranged on the optical axis 9, the slide 10 is sleeved on the optical axis 9 and the lower end of the slide 10 corresponds to the upper end of the bottom plate 7, the magnetic scale 1 is arranged at the upper end of the bottom plate 7 and located between the vertical plates 8, the reading head 2 is fixed to the lower end of the slide 10 and the window 6 of the shell 3 corresponds to the magnetic scale 1.

[0016] The structure of the reading head 2 is limited and simplified, and the volume is small. The optical axis 9 is used as a slide rail, and the slide 10 is used as a moving trolley. The reading head 2 is fixed to the lower end of the slide 10 with its window facing downward. The magnetic scale 1 is installed on the base plate 7. The window of the reading head 2 corresponds to the magnetic scale 1. The slide 10 slides on the optical axis 9, and the resistance is smaller than that of the guide rail. This design adopts a simpler reading head 2 and guide rail structure, and the sliding is stable and reliable, which not only reduces the complex operability during production and assembly, but also reduces the production cost.

[0017] like Figure 2 As shown, the guide rail also includes a slide groove 11 arranged on the base plate 7 and a slide plate 12 arranged at the lower end of the slide seat 10. The slide groove 11 is arranged along the length direction of the base plate 7 and is respectively located on both sides of the magnetic scale 1. The upper end of the slide plate 12 is fixed to the slide seat 10 and the lower end is embedded in the slide groove 11.

[0018] The slide groove 11 and the slide plate 12 cooperate to further limit and support the sliding trajectory of the slide 10, reduce the stress level of the optical axis 9, and allow the slide 10 to slide more stably, and protect the reading head 2 installed at the lower end of the slide 10 and between the slide plates 12.

[0019] like Figure 2 As shown, the slide groove 11 is a dovetail groove structure, and the lower end of the slide plate 12 is adapted to the dovetail groove.

[0020] The slide plate 12 is limited to prevent it from falling off, thereby further improving the stability of the slide plate 12 when sliding.

[0021] like Figure 2 As shown, the slide groove 11 is a through groove, and a convex block 13 adapted to the slide groove 11 is provided at the lower end of the vertical plate 8 . The vertical plate 8 is fixed on the bottom plate 7 and the convex block at the lower end of the vertical plate 8 is embedded in the slide groove 11 .

[0022] The through groove can facilitate the installation and positioning of the vertical plate 8 and the sliding plate 12, and further facilitates production and assembly.

[0023] like Figure 2 As shown, the guide rail further includes a raised long platform 14 provided at the upper end of the bottom plate 7 and located between the vertical plates 8 , and the magnetic scale 1 is provided on the raised long platform 14 .

[0024] The raised long platform 14 plays a role in positioning the installation of the magnetic scale 1 to avoid deviation in installation, and can also prevent the debris splashed when the slide grooves 11 and the slide plate 12 on both sides slide from covering the magnetic scale 1.

[0025] like Figure 2 As shown, a mounting groove 15 is provided at the upper end of the raised long platform 14 , and the magnetic scale 1 is arranged in the mounting groove 15 .

[0026] The installation groove 12 further positions and limits the installation position of the magnetic scale 1 to facilitate installation. At the same time, the raised groove walls on both sides can provide protection for the magnetic scale 1.

Claims

1. An absolute value encoder structure, comprising a guide rail, a magnetic scale (1) arranged on the guide rail, and a reading head (2), wherein the reading head (2) and the magnetic scale (1) are spaced correspondingly, and characterized in that: The reading head (2) comprises a shell (3) with an opening at the upper end and a threading hole at one side, a PCB board (4) arranged in the shell (3), and a cover plate (5) covering the opening of the shell (3); the shell (3) is a rectangular parallelepiped structure and a window (6) is arranged at the bottom end of the shell (3); the guide rail comprises a bottom plate (7), vertical plates (8) arranged at both ends of the bottom plate (7), an optical axis (9) arranged between the vertical plates (8), and a slide seat (10) slidably arranged on the optical axis (9); the slide seat (10) is sleeved on the optical axis (9) and the lower end of the slide seat (10) corresponds to the upper end of the bottom plate (7); the magnetic scale (1) is arranged at the upper end of the bottom plate (7) and between the vertical plates (8); the reading head (2) is fixed to the lower end of the slide seat (10) and the window (6) of the shell (3) corresponds to the magnetic scale (1).

2. An absolute value encoder structure according to claim 1, characterized in that: The guide rail further comprises a slide groove (11) arranged on the base plate (7) and a slide plate (12) arranged at the lower end of the slide seat (10); the slide groove (11) is arranged along the length direction of the base plate (7) and is respectively located on both sides of the magnetic scale (1); the upper end of the slide plate (12) is fixed to the slide seat (10) and the lower end is embedded in the slide groove (11).

3. An absolute value encoder structure according to claim 2, characterized in that: The slide groove (11) is in the form of a dovetail groove structure, and the lower end of the slide plate (12) is adapted to the dovetail groove.

4. The absolute value encoder structure according to claim 2, characterized in that: The slide groove (11) is a through groove, and a convex block (13) adapted to the slide groove (11) is arranged at the lower end of the vertical plate (8). The vertical plate (8) is fixed on the bottom plate (7) and the convex block at the lower end of the vertical plate (8) is embedded in the slide groove (11).

5. The absolute value encoder structure according to claim 1, characterized in that: The guide rail also includes a raised long platform (14) provided at the upper end of the bottom plate (7) and located between the vertical plates (8), and the magnetic scale (1) is arranged on the raised long platform (14).

6. The absolute value encoder structure according to claim 5, characterized in that: The upper end of the raised long platform (14) is provided with a mounting groove (15), and the magnetic scale (1) is arranged in the mounting groove (15).

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