Grating ruler indication grating bonding gap guaranteeing device

Abstract

The invention relates to a device for guaranteeing the bonding gap of an indication grating of a grating ruler, an indication grating clamp in the device can horizontally move, rotate and vertically move on an indication grating adjusting mechanism, and the position of the indication grating clamp in the vertical direction is monitored by a digital display dial indicator; the main grating is pressed and fixed on the carriage adjusting mechanism by the indication grating carriage, and the indication grating carriage can horizontally move and rotate on the carriage adjusting mechanism; the indication grating clamp can extend the indication grating clamped at the lower end of the indication grating clamp into a bonding hole in the indication grating sliding frame; and the optical imaging system can be used for imaging a bonding hole area on the indicating grating sliding frame. The gap between the two can be effectively guaranteed, the rate of finished products is high, and the requirement for the proficiency degree of operators is low.

Description

Technical Field

[0001] The invention relates to a device for ensuring a grating ruler indicating a grating bonding gap, and belongs to the technical field of photoelectric measurement. Background Art

[0002] Today's precision measuring mechanisms and displacement control systems have widely used grating rulers as their core components, and the requirements for the accuracy and reliability of grating rulers are becoming increasingly higher, forcing the production technology and production process of grating rulers to seek new ways to improve.

[0003] The core component of the grating ruler is composed of a pair of grating pairs, namely the main grating and the indicator grating. The main working principle of the grating ruler is to use the relative movement of the main grating and the indicator grating to form alternating light and dark moiré fringes, receive the light energy transmitted through the grating pair through the photoelectric device, filter the interference signal through the electronic analog circuit and digital circuit, and subdivide the effective signal, so as to measure the position.

[0004] During the production process of the grating ruler, the gap between the indicator grating and the main grating will directly affect the quality of the moiré fringe signal, thereby affecting the accuracy of the grating ruler. The existing indicator grating bonding technology can meet the bonding and fixation of the indicator grating and the indicator grating slide to a certain extent, but there are also the following problems: 1. The existing gap between the indicator grating and the main grating is ensured by a plug, and there is a jamming phenomenon when adjusting the indicator grating; the gap plug is very thin and very easy to deform, and the uniformity of the gap cannot be guaranteed after deformation; each replacement of the plug requires re-adjustment of the gap mechanism, which not only increases the material cost but also increases the time cost. 2. The existing tooling cannot display the gap of the grating pair, and it is impossible to judge whether it is qualified during operation. It can only detect whether the gap of the grating pair is qualified after the indicator grating is bonded, resulting in an extremely low yield rate and high requirements for the proficiency of the operator. 3. The existing tooling cannot quickly and accurately clamp the indicator grating slide, and the operation time is too long. 4. The existing tooling cannot adjust the position of the indicating grating slide and the main grating. When the relative positions of the indicating grating slide, the main grating and the measuring camera change, the measuring camera needs to be recalibrated, which is time-consuming and laborious. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a device for ensuring the bonding gap of a grating ruler which can quickly and accurately indicate and ensure the gap between the indicating grating and the main grating.

[0006] In order to solve the above technical problems, the device for ensuring the bonding gap of the grating ruler indicating grating of the present invention includes an indicating grating adjustment mechanism, a digital micrometer, an indicating grating clamp, an indicating grating slide, a slide adjustment mechanism, and an optical imaging system; the indicating grating clamp can move horizontally, rotate and vertically on the indicating grating adjustment mechanism, and its vertical position is monitored by the digital micrometer; the main grating is pressed and fixed on the slide adjustment mechanism by the indicating grating slide, and the indicating grating slide can move horizontally and rotate on the slide adjustment mechanism; the indicating grating clamp can extend the indicating grating clamped at its lower end into the bonding hole on the indicating grating slide; the optical imaging system can image the bonding hole area on the indicating grating slide.

[0007] The indicating grating adjustment mechanism comprises a first XY displacement adjustment platform with a central through hole, a first rotation adjustment platform, and a Z-axis displacement platform; the first rotation adjustment platform is arranged on the first XY displacement adjustment platform, and the Z-axis displacement platform is fixedly connected to the first rotation adjustment platform; the indicating grating fixture is connected to the movable part of the Z-axis displacement platform, extends downward through the central through holes of the first XY displacement adjustment platform and the first rotation adjustment platform, and can fine-tune the height through the Z-axis displacement platform; the digital micrometer is fixed on the first XY displacement adjustment platform.

[0008] The indicating grating adjustment mechanism also includes a high-precision slide; the high-precision slide is connected to the movable component and can slide vertically relative to the movable component, and the indicating grating fixture is connected below the high-precision slide; the movable component is provided with an upper limit structure and a lower limit structure.

[0009] The indicating grating adjustment mechanism also includes a handle assembly and an adapter plate with a central through hole; the handle assembly is fixedly connected to the high-precision slide, and the high-precision slide can be lifted by the handle assembly; the adapter plate is fixed on the rotating adjustment table, and a stop handle is provided on the adapter plate; when the stop handle is in the stop position, the handle assembly falls on the stop handle when the high-precision slide falls; when the stop handle is in the non-stop position, the high-precision slide is stuck on the lower limit structure of the movable part; the probe of the digital micrometer contacts the upper surface of the handle assembly.

[0010] The slide adjustment mechanism includes a second XY displacement adjustment platform with a central through hole, a second rotation adjustment platform and an adapter, and two horizontal positioning clamps and two vertical positioning clamps fixed on the adapter; the second rotation adjustment platform is arranged on the second XY displacement adjustment platform, and the adapter is fixed on the second rotation adjustment platform; the main grating is arranged on the adapter, and the indicator grating slide is pressed on the main grating by two horizontal positioning clamps and two vertical positioning clamps.

[0011] The slide adjustment mechanism also includes two pads and two clamping and fixing blocks; the two pads are fixed on both sides of the central through hole of the adapter, the two clamping and fixing blocks respectively clamp the two ends of the main grating on the two pads, and the two vertical positioning clamps are respectively fixed on the two pads.

[0012] Furthermore, the two horizontal positioning clamps are fixed on the adapter through adjusting gaskets.

[0013] The optical imaging system comprises a connecting piece, three adjusting screws, a lens adjustment frame, a telecentric lens and a measuring camera; the three adjusting screws are connected to the connecting piece; the lens adjustment frame is supported by the three adjusting screws and can adjust the height; the telecentric lens is installed on the lens adjustment frame, and the lower end of the telecentric lens is connected to the measuring camera.

[0014] The present invention also includes a supporting mechanism; the supporting mechanism is composed of a supporting seat with a central through hole and a base plate, the supporting seat is fixed on the base plate; the indicating grating adjustment mechanism is installed on the supporting seat, the slide adjustment mechanism is installed on the base plate, and the optical imaging system is installed under the base plate.

[0015] The present invention has the following beneficial effects:

[0016] 1. The height of the indicating grating can be fine-tuned in real time through the Z-axis translation stage and the distance between the indicating grating and the main grating can be observed through the digital micrometer, which can effectively ensure the gap between the two, with high yield and low requirements on the proficiency of the operator.

[0017] 2. The clamping force is applied to the indicating grating slide by four positioning clamps to simulate the actual stress state of the indicating grating slide during operation. It is easy to operate and has high repeatability, and can avoid the gap deviation problem caused by inconsistent stress conditions during assembly.

[0018] 3. The high-precision slide table can realize the rapid movement of the indicating grating fixture in the Z direction, which is convenient for the clamping of the indicating grating and improves the production efficiency.

[0019] 4. The position of the indicator grating slide and the main grating in the field of view of the measuring camera can be adjusted through the slide adjustment mechanism, which is convenient for the measuring camera to calibrate the position. When the relative position of the indicator grating slide, the main grating and the measuring camera changes, there is no need to recalibrate the measuring camera, which saves time and effort and improves the production efficiency of the indicator grating bonding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 It is the overall structure front view of the present invention.

[0022] Figure 2It is an axonometric diagram indicating the grating adjustment mechanism.

[0023] Figure 3 It is an axonometric view indicating the grating slide adjustment mechanism.

[0024] Figure 4 It is a front view of the optical imaging system.

[0025] Figure 5 It is an axonometric drawing of the supporting mechanism.

[0026] Figure 6 It is an axonometric view of the indicator grating carriage.

[0027] Figure 7 This is a diagram showing the bonding status of the indicator grating and the indicator grating slide.

[0028] In the figure: 1. Indicator grating adjustment mechanism; 11. First XY displacement adjustment stage; 12. First rotation adjustment stage; 16. Adapter plate; 13. Z-axis displacement stage; 131. Movable component; 132. Fine adjustment screw; 14. High-precision slide; 15. Handle assembly; 16. Adapter plate; 161. Stop handle; 2. Digital dial gauge; 21. Dial gauge fixing assembly; 22. Probe; 3. Indicator grating fixture; 4. Indicator grating carriage; 41. Adhesive hole; 5. Slide adjustment Section mechanism; 51. Second XY displacement adjustment table; 52. Second rotation adjustment table; 53. Adapter; 54. Horizontal positioning clamp; 55. Vertical positioning clamp; 56. Pad; 57. Pressing and fixing block; 58. Adjusting gasket; 6. Optical imaging system; 61. Connector; 62. Adjusting screw; 63. Lens adjustment bracket; 64. Telecentric lens; 65. Measuring camera; 7. Support mechanism; 71. Support seat; 72. Bottom plate; 8. Main grating; 9. Indicator grating. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" or "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] like Figure 1 As shown, the device for ensuring the bonding gap of the grating ruler indicating the grating of the present invention comprises an indicating grating adjustment mechanism 1, a digital micrometer 2, an indicating grating fixture 3, an indicating grating carriage 4, a carriage adjustment mechanism 5, an optical imaging system 6, and a supporting mechanism 7. The indicating grating adjustment mechanism 1, the carriage adjustment mechanism 5, and the optical imaging system 6 are connected and supported and fixed by the supporting mechanism 7.

[0034] like Figure 2As shown, the indicating grating adjustment mechanism 1 includes a first XY displacement adjustment platform 11 with a central through hole, a first rotation adjustment platform 12, an adapter plate 16, a Z-axis displacement platform 13, a high-precision slide 14, a handle assembly 15, and a micrometer fixing assembly 17; the first rotation adjustment platform 12 is arranged on the first XY displacement adjustment platform 11, the adapter plate 16 is fixed on the rotation adjustment platform 12, the Z-axis displacement platform 13 is fixedly connected to the first rotation adjustment platform 12, and the height of the movable component 131 of the Z-axis displacement platform 13 can be fine-tuned by a fine-tuning screw 132; the high-precision slide 14 is connected to the movable component 131 through a vertical slide rail pair, and the handle assembly 15 is fixedly connected to the high-precision slide 14, and the high-precision slide can be lifted by the handle assembly 15 The movable part 131 is provided with an upper limit structure and a lower limit structure, the upper limit structure can prevent the high-precision slide 14 from slipping when it is lifted upward, and the lower limit structure can make the high-precision slide 14 stop on the movable part 131; a stop handle 161 is provided on the adapter plate 16; when the stop handle 161 is rotated to the stop position, the handle assembly 15 falls on the stop handle 161; when the stop handle 161 is in the non-stop position, the high-precision slide 14 stops on the lower limit structure of the movable part 131; the indicating grating fixture 3 is connected under the high-precision slide 14, and extends downward through the first XY displacement adjustment table 11, the first rotation adjustment table 12, and the central through hole of the adapter plate 16, and the indicating grating 9 is clamped at the lower end of the indicating grating fixture 3.

[0035] The digital micrometer 2 is fixed on the first XY displacement adjustment platform 11 through a micrometer fixing assembly 21. The probe 22 of the digital micrometer 2 contacts the upper surface of the handle assembly 15 to measure the moving position of the indicating grating in real time.

[0036] like Figure 6 , 7 As shown, the indicating grating slide 4 has a bonding hole 41 at the middle position.

[0037] like Figure 3As shown, the slide adjustment mechanism 5 includes a second XY displacement adjustment table 51 with a central through hole, a second rotation adjustment table 52 and an adapter 53, two horizontal positioning clamps 54, two vertical positioning clamps 55, two cushion blocks 56, and two clamping and fixing blocks 57; the second rotation adjustment table 52 is arranged on the second XY displacement adjustment table 51, and the adapter 53 is fixed on the second rotation adjustment table 52; the two cushion blocks 56 are fixed on both sides of the central through hole of the adapter 53, and the two clamping and fixing blocks 57 respectively clamp and fix the two ends of the main grating 8 on the two cushion blocks 56; the two horizontal positioning clamps 54 are fixed on the adapter 53 through the adjusting gasket 58, and the two vertical positioning clamps 55 are respectively fixed on the two cushion blocks 56, and the indicating grating slide 4 is clamped on the main grating 8 through the two horizontal positioning clamps 54 and the two vertical positioning clamps 55. The clamping points A, B, C, and D of the four clamps are the same as the clamping positions of the indicating grating slide during actual operation, and the height of the horizontal clamping position can be adjusted by adjusting the thickness of the adjusting gasket 58. When the grating scale is actually working, the indicating grating slide 4 is pressed against the main grating 8 by two torsion springs and two compression springs. The horizontal positioning clamp 54 simulates a torsion spring, and the vertical positioning clamp 55 simulates a compression spring. Two pairs of positioning clamps of different forms are used to simulate the assembly conditions of the indicating grating slide 4 under the use conditions for fixing. By calculating the spring elastic coefficient and compression amount on the horizontal positioning clamp 54 and the vertical positioning clamp 55, the fixed clamping force can be made the same as the elastic force of the torsion spring and the compression spring under the actual use conditions of the indicating grating slide 4, which solves the influence of inconsistent force conditions, positioning accuracy and other factors on the bonding of the indicating grating, and realizes the fast and accurate clamping of the indicating grating slide 4, which is convenient for mass production.

[0038] The optical imaging system 6 includes a connector 61, three adjustment screws 62, a lens adjustment frame 63, a telecentric lens 64 and a measuring camera 65; the three adjustment screws 62 are threadedly connected to the connector 61; the telecentric lens 64 is mounted on the lens adjustment frame 63, and the lower end of the telecentric lens 64 is connected to the measuring camera 65; the top of the three adjustment screws 62 floats to support the adjustable lens adjustment frame 63. The measuring camera 65 can calibrate the position of the bonding hole area of ​​the indicator grating slide 4. The image formed by the measuring camera 304 is output to the display screen with a 4K resolution, and the spatial position of the lens adjustment frame 63 is adjusted. When the bonding hole area of ​​the indicator grating slide 4 is clearly imaged, the lens adjustment frame 63 is fixed, and the bonding hole area in the field of view of the measuring camera 65 is marked and positioned.

[0039] The supporting mechanism 7 is used for supporting and fixing the whole device, and is mainly composed of a base plate 72 with a central through hole and a supporting seat 71, and the supporting seat 71 is fixed on the base plate 72; the indicating grating adjustment mechanism 1 is installed on the supporting seat 71, and the fixing part of the first XY displacement adjustment stage 11 is fixedly connected to the supporting seat 71; the slide adjustment mechanism 5 is installed on the base plate 72, and the fixing part of the second XY displacement adjustment stage 51 is fixedly connected to the base plate 72; the optical imaging system 6 is installed under the base plate 72, and the connecting member 61 is fixedly connected to the base plate 72.

[0040] The working process of the present invention is as follows: first, the stop handle 161 is rotated to the stop position, and the high-precision slide 14 is lifted upward by the handle assembly 15, thereby driving the indicator grating fixture 3 to be lifted; then the indicator grating is clamped and fixed to the lower end of the indicator grating fixture 3; the handle assembly 15 is lowered so that it falls on the stop handle 161. At this time, the measuring camera 65 is located at a pre-adjusted position, and the bonding hole area of ​​the indicator grating slide 4 can be clearly imaged on the measuring camera 65; the position of the indicator grating slide 4 is adjusted by the slide adjustment mechanism 5, so that the edge of the bonding hole coincides with the pre-calibrated positioning line in the field of view of the measuring camera 65. Rotate the stop handle 161 to the non-stop position so that the high-precision slide 14 stops on the lower limit structure of the movable component 131; adjust the position and angle of the indicator grating through the indicator grating adjustment mechanism 1, and fine-tune the height of the indicator grating through the Z-axis displacement stage 13, while observing the reading of the digital micrometer 2. When the reading is equal to the pre-calibrated value, it means that the gap between the indicator grating and the main grating 8 meets the design requirements. At this time, the image output by the measuring camera can be observed to see the effect of the moiré fringes formed by the indicator grating and the main grating; when the moiré fringes effect is not ideal, the angle and position of the indicator grating can be fine-tuned through the indicator grating adjustment mechanism 1. When the position and angle of the indicator grating correspond to the bonding hole 41, the moiré fringes achieve an ideal effect, and the edge or corner of the indicator grating is bonded and fixed to the inner wall of the bonding hole to complete the assembly.

Claims

1. A device for ensuring the grating ruler indicating the grating bonding gap, characterized in that The invention comprises an indicating grating adjustment mechanism (1), a digital micrometer (2), an indicating grating clamp (3), an indicating grating slide (4), a slide adjustment mechanism (5), and an optical imaging system (6); the indicating grating clamp can move horizontally, rotate and vertically on the indicating grating adjustment mechanism, and its vertical position is monitored by the digital micrometer; the main grating (8) is pressed and fixed on the slide adjustment mechanism by the indicating grating slide, and the indicating grating slide can move horizontally and rotate on the slide adjustment mechanism; the indicating grating clamp can extend the indicating grating (9) clamped at its lower end into a bonding hole (41) on the indicating grating slide; and the optical imaging system can image the bonding hole area on the indicating grating slide.

2. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 1 is characterized in that The indicating grating adjustment mechanism comprises a first XY displacement adjustment platform (11) with a central through hole, a first rotation adjustment platform (12), and a Z-direction displacement platform (13); the first rotation adjustment platform is arranged on the first XY displacement adjustment platform, and the Z-direction displacement platform is fixedly connected to the first rotation adjustment platform; the indicating grating fixture is connected to a movable component (131) of the Z-direction displacement platform, extends downward through the central through holes of the first XY displacement adjustment platform and the first rotation adjustment platform, and can be finely adjusted in height through the Z-direction displacement platform; and the digital micrometer is fixed on the first XY displacement adjustment platform.

3. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 2 is characterized in that The indicating grating adjustment mechanism also includes a high-precision slide table (14); the high-precision slide table is connected to the movable component and can slide vertically relative to the movable component, and the indicating grating fixture is connected below the high-precision slide table; the movable component is provided with an upper limit structure and a lower limit structure.

4. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 3 is characterized in that The indicating grating adjustment mechanism also includes a handle assembly (15) and an adapter plate (16) with a central through hole; the handle assembly is fixedly connected to the high-precision slide, and the high-precision slide can be lifted by the handle assembly; the adapter plate is fixed on the rotary adjustment table, and a stop handle (161) is arranged on the adapter plate; when the stop handle is in the stop position, the handle assembly falls on the stop handle when the high-precision slide falls; when the stop handle is in the non-stop position, the high-precision slide is stuck on the lower limit structure of the movable part; the probe of the digital micrometer contacts the upper surface of the handle assembly.

5. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 1 is characterized in that The slide adjustment mechanism comprises a second XY displacement adjustment platform (51) with a central through hole, a second rotation adjustment platform (52) and an adapter (53), and two horizontal positioning clamps (54) and two vertical positioning clamps (55) fixed on the adapter; the second rotation adjustment platform is arranged on the second XY displacement adjustment platform, and the adapter is fixed on the second rotation adjustment platform; the main grating (8) is arranged on the adapter, and the indicator grating slide is pressed on the main grating through the two horizontal positioning clamps and the two vertical positioning clamps.

6. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 5 is characterized in that The slide adjustment mechanism also includes two pads (56) and two clamping and fixing blocks (57); the two pads are fixed on both sides of the central through hole of the adapter, the two clamping and fixing blocks respectively clamp the two ends of the main grating on the two pads, and the two vertical positioning clamps are respectively fixed on the two pads.

7. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 5, characterized in that The two horizontal positioning clamps are fixed on the adapter through adjusting gaskets (58).

8. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 1 is characterized in that The optical imaging system comprises a connecting piece (61), three adjusting screws (62), a lens adjustment frame (63), a telecentric lens (64) and a measuring camera (65); the three adjusting screws are connected to the connecting piece; the lens adjustment frame is supported by the three adjusting screws and can adjust the height; the telecentric lens is mounted on the lens adjustment frame, and the lower end of the telecentric lens is connected to the measuring camera.

9. The device for ensuring the grating ruler indicating the grating bonding gap according to claim 1, characterized in that It also includes (7); the support mechanism is composed of a support base (71) with a central through hole and a base plate (72), the support base is fixed on the base plate; the indicating grating adjustment mechanism is installed on the support base, the slide adjustment mechanism is installed on the base plate, and the optical imaging system is installed below the base plate.

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