A device for ensuring the bonding gap of an optical encoder scale

Abstract

The present application relates to a kind of guarantee devices of grating scale indicating grating bonding gap, the device in which indicating grating clamp can be horizontally moved, rotated and vertically moved on indicating grating adjusting mechanism, and its vertical direction position is monitored by digital dial gauge;Main grating is fixed on slide adjusting mechanism by indicating grating slide carriage pressure tight, and indicating grating slide carriage can be horizontally moved and rotated on slide adjusting mechanism;Indicating grating clamp can extend into bonding hole in indicating grating slide carriage by indicating grating clamped in its lower end;Optical imaging system can image the bonding hole area on indicating grating slide carriage.The present application can effectively guarantee the gap between the two, and the yield is high, and the proficiency requirement of operator is low.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of guarantee device of grating ruler indicating grating bonding gap, belong to photoelectric measurement technical field. BACKGROUND

[0002] Now precision measuring mechanism and displacement control system have been widely used grating ruler as its core component, and the precision and reliability of grating ruler are increasingly required, resulting in grating ruler production technology and production process have to seek new promotion method.

[0003] The core component of grating ruler is made of a pair of grating pair, respectively main grating and indicating grating, and the main working principle of grating ruler is to form the light and dark moire fringe by the relative movement of main grating and indicating grating, the light energy is received by photoelectric device through grating pair, and the interference signal is filtered and the effective signal is subdivided by analog circuit and digital circuit, so as to carry out position measurement.

[0004] The gap between indicating grating and main grating will directly affect the quality of moire fringe signal during the production process of grating ruler, thereby affecting the precision of grating ruler. The existing indicating grating bonding technology can meet the bonding and fixing of indicating grating and indicating grating slide to some extent, but there are the following problems: 1. The existing gap is guaranteed by plug-in sheet between indicating grating and main grating, and there is a phenomenon of jamming when adjusting indicating grating. The gap plug-in sheet is very thin and easy to deform, and after deformation, the uniformity of the gap cannot be guaranteed. Each time the plug-in sheet is replaced, the gap mechanism needs to be adjusted again, which not only increases the material cost but also increases the time cost. 2. The existing tooling cannot display the gap of grating pair, and the operator cannot judge whether it is qualified during operation. The gap of grating pair can only be detected after the indicating grating is bonded, which leads to a very low yield and requires a high degree of proficiency of the operator. 3. The existing tooling cannot quickly and accurately clamp the indicating grating slide, and the operation time is too long. 4. The existing tooling cannot adjust the position of indicating grating slide and main grating. When the relative position of indicating grating slide, main grating and measurement camera changes, the measurement camera needs to be recalibrated, which is time-consuming and laborious. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a grating ruler indicating grating bonding gap guarantee device that can quickly and accurately indicate and guarantee the gap between indicating grating and main grating.

[0006] To solve the above technical problems, the guarantee device for the bonding gap of the indicating grating of the grating ruler of the present application comprises an indicating grating adjusting mechanism, a digital dial gauge, an indicating grating clamp, an indicating grating slide, a slide adjusting mechanism, and an optical imaging system; the indicating grating clamp can move horizontally, rotate, and move vertically on the indicating grating adjusting mechanism, and its vertical position is monitored by the digital dial gauge; the main grating is fixed on the slide adjusting mechanism by the indicating grating slide, and the indicating grating slide can move horizontally and rotate on the slide adjusting mechanism; the indicating grating clamp can extend the indicating grating clamped on its lower end into the bonding hole on the indicating grating slide; and the optical imaging system can image the bonding hole area on the indicating grating slide.

[0007] The indicating grating adjusting mechanism comprises a first XY displacement adjusting platform with a central through hole, a first rotating adjusting platform, and a Z-direction displacement platform; the first rotating adjusting platform is arranged on the first XY displacement adjusting platform, and the Z-direction displacement platform is fixedly connected with the first rotating adjusting platform; the indicating grating clamp is connected with the movable part of the Z-direction displacement platform, extends downward through the central through hole of the first XY displacement adjusting platform and the first rotating adjusting platform, and can be finely adjusted in height by the Z-direction displacement platform; and the digital dial gauge is fixed on the first XY displacement adjusting platform.

[0008] The indicating grating adjusting mechanism further comprises a high-precision slide platform; the high-precision slide platform is connected with the movable part and can slide vertically relative to the movable part, and the indicating grating clamp is connected below the high-precision slide platform; upper and lower limit structures are arranged on the movable part.

[0009] The indicating grating adjusting mechanism further comprises a handle assembly and an adapter plate with a central through hole; the handle assembly is fixedly connected with the high-precision slide platform, and the high-precision slide platform can be lifted up by the handle assembly; the adapter plate is fixed on the rotating adjusting platform, and a stop handle 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 platform falls; when the stop handle is in the non-stop position, the high-precision slide platform is clamped on the lower limit structure of the movable part; and the probe of the digital dial gauge is in contact with the upper surface of the handle assembly.

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

[0011] The slide adjusting mechanism further comprises two pads and two pressing fixing blocks; the two pads are fixed on both sides of the central through hole of the adapter, and the two pressing fixing blocks are used for pressing and fixing the two ends of the main grating on the two pads respectively, and the two vertical positioning clamps are fixed on the two pads respectively.

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

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

[0014] The present application further comprises a supporting mechanism; the supporting mechanism is composed of a supporting seat with a central through hole and a bottom plate, and the supporting seat is fixed on the bottom plate; the indicating grating adjusting mechanism is installed on the supporting seat, the slide adjusting mechanism is installed above the bottom plate, and the optical imaging system is installed below the bottom plate.

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

[0016] 1. The height of the indicating grating can be adjusted in real time through the Z-direction displacement table, and the distance between the indicating grating and the main grating can be observed through the digital dial gauge, so that the gap between the two can be effectively ensured, the yield is high, and the proficiency of the operator is low.

[0017] 2. The indicating grating slide is clamped by the four positioning clamps, so that the stress state of the indicating grating slide during actual work is simulated, the operation is convenient, the repeat precision is high, and the gap deviation problem caused by inconsistent stress during assembly can be avoided.

[0018] 3. The indicating grating clamp can be quickly moved in the Z-direction through the high-precision slide table, the clamping of the indicating grating is facilitated, and the production efficiency is improved.

[0019] 4. The positions of the indicating grating slide and the main grating in the field of view of the measuring camera can be adjusted through the slide adjusting mechanism, the position can be calibrated by the measuring camera conveniently, and when the relative positions of the indicating grating slide, the main grating and the measuring camera change, the measuring camera does not need to be calibrated again, time and labor are saved, and the production efficiency of the indicating grating bonding is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described in detail below in combination with the drawings and specific embodiments.

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

[0022] Figure 2is a perspective view of the indicator grating adjustment mechanism.

[0023] Figure 3 is a perspective view of the indicator grating carriage adjustment mechanism.

[0024] Figure 4 is an elevation view of the optical imaging system.

[0025] Figure 5 is a perspective view of the support mechanism.

[0026] Figure 6 is a perspective view of the indicator grating carriage.

[0027] Figure 7 is a state diagram of the indicator grating and the indicator grating carriage.

[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 direction displacement stage; 131. movable part; 132. fine adjustment screw; 14. high-precision sliding stage; 15. handle assembly; 16. adapter plate; 161. stop handle; 2. digital dial gauge; 21. dial gauge fixing assembly; 22. probe; 3. indicator grating clamp; 4. indicator grating carriage; 41. bonding hole; 5. carriage adjustment mechanism; 51. second XY displacement adjustment stage; 52. second rotation adjustment stage; 53. adapter; 54. horizontal positioning clamp; 55. vertical positioning clamp; 56. spacer; 57. compression fixing block; 58. adjustment spacer; 6. optical imaging system; 61. connecting piece; 62. adjustment screw; 63. lens adjustment frame; 64. telecentric lens; 65. measurement camera; 7. support mechanism; 71. support base; 72. bottom plate; 8. main grating; 9. indicator grating. DETAILED DESCRIPTION

[0029] The application will be described in further detail below with reference to the drawings and embodiments, it can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the application are shown in the drawings, and not all the structures.

[0030] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0032] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] As shown in Figure 1 The guarantee device for indicating the bonding gap of the indicating grating of the present application includes an indicating grating adjusting mechanism 1, a digital dial gauge 2, an indicating grating clamp 3, an indicating grating carriage 4, a carriage adjusting mechanism 5, an optical imaging system 6, and a supporting mechanism 7. The indicating grating adjusting mechanism 1, the carriage adjusting mechanism 5 and the optical imaging system 6 are connected and supported and fixed by the supporting mechanism 7.

[0034] As shown in Figure 2As shown, the indicating grating adjustment mechanism 1 comprises a first XY displacement adjustment platform 11 with a central through hole, a first rotary adjustment platform 12, an adapter plate 16, and a Z-direction displacement platform 13, a high-precision sliding platform 14, a handle assembly 15, and a micrometer fixed assembly 17. The first rotary adjustment platform 12 is arranged on the first XY displacement adjustment platform 11, the adapter plate 16 is fixed on the rotary adjustment platform 12, the Z-direction displacement platform 13 is fixedly connected with the first rotary adjustment platform 12, and the height of a movable part 131 of the Z-direction displacement platform 13 can be finely adjusted through a fine adjustment screw 132. The high-precision sliding platform 14 is connected with the movable part 131 through a vertical sliding rail pair, the handle assembly 15 is fixedly connected with the high-precision sliding platform 14, and the high-precision sliding platform can be lifted up through the handle assembly 15. An upper limit structure and a lower limit structure are arranged on the movable part 131, the upper limit structure can prevent the high-precision sliding platform 14 from slipping upward, and the lower limit structure can make the high-precision sliding platform 14 stop on the movable part 131. A stop handle 161 is arranged on the adapter plate 16. When the stop handle 161 is rotated to a stop position, the handle assembly 15 falls on the stop handle 161. When the stop handle 161 is located at a non-stop position, the high-precision sliding platform 14 stops on the lower limit structure of the movable part 131. The indicating grating clamp 3 is connected below the high-precision sliding platform 14 and extends downward through the central through hole of the first XY displacement adjustment platform 11, the first rotary adjustment platform 12 and the adapter plate 16, and the indicating grating 9 is clamped at the lower end of the indicating grating clamp 3.

[0035] The digital micrometer 2 is fixed on the first XY displacement adjustment platform 11 through the micrometer fixed assembly 21, the probe 22 of the digital micrometer 2 is in contact with the upper surface of the handle assembly 15, and the movement position of the indicating grating is measured in real time.

[0036] As shown in Figure 6 , 7 The indicating grating carriage 4 has an adhesive hole 41 at the middle position.

[0037] As shown in Figure 3As shown, the slide adjusting mechanism 5 includes a second XY displacement adjusting table 51 with a central through hole, a second rotary adjusting table 52, an adapter 53, two horizontal positioning clamps 54, two vertical positioning clamps 55, two pads 56, and two compression fixing blocks 57. The second rotary adjusting table 52 is arranged on the second XY displacement adjusting table 51, and the adapter 53 is fixed on the second rotary adjusting table 52. The two pads 56 are fixed on both sides of the central through hole of the adapter 53, and the two compression fixing blocks 57 respectively compress and fix the two ends of the main grating 8 on the two pads 56. The two horizontal positioning clamps 54 are fixed on the adapter 53 through adjusting shims 58, and the two vertical positioning clamps 55 are respectively fixed on the two pads 56. The indicating grating slide 4 is compressed on the main grating 8 by 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 in actual work, and the thickness of the adjusting shims 58 can be adjusted to adjust the height of the horizontal clamping position. In actual work of the grating ruler, the indicating grating slide 4 is compressed on the main grating 8 by two torsion springs and two compression springs. The horizontal positioning clamps 54 simulate the torsion springs, and the vertical positioning clamps 55 simulate the compression springs. The two pairs of different forms of positioning clamps are used to simulate the assembly conditions of the indicating grating slide 4 in the working condition to fix. Through the calculation of the spring elastic coefficients and compression amounts of the horizontal positioning clamps 54 and the vertical positioning clamps 55, the fixed clamping force is the same as the elastic force of the torsion springs and the compression springs of the indicating grating slide 4 in the actual working condition, which solves the influence of inconsistent stress conditions, positioning accuracy and other factors on the adhesion of the indicating grating, and realizes the rapid and accurate clamping of the indicating grating slide 4, which is convenient for batch production.

[0038] The optical imaging system 6 includes a connecting piece 61, three adjusting screws 62, a lens adjusting frame 63, a telecentric lens 64, and a measurement camera 65. The three adjusting screws 62 are threadedly connected with the connecting piece 61. The telecentric lens 64 is installed on the lens adjusting frame 63, and the lower end of the telecentric lens 64 is connected with the measurement camera 65. The top ends of the three adjusting screws 62 are floatingly supported to adjust the lens adjusting frame 63. The measurement camera 65 can perform position calibration on the adhesion hole area of the indicating grating slide 4. The image formed by the measurement camera 304 is output to a 4K resolution display screen. The spatial position of the lens adjusting frame 63 is adjusted, and when the adhesion hole area of the indicating grating slide 4 is clearly imaged, the lens adjusting frame 63 is fixed, and the adhesion hole area in the field of view of the measurement camera 65 is marked and positioned.

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

[0040] The working process of the present application is as follows: first, the idle rotating handle 161 is rotated to the idle position, the high-precision slide table 14 is lifted up by the handle assembly 15, so as to drive the indicating grating clamp 3 to be lifted up; then the indicating grating is clamped and fixed at the lower end of the indicating grating clamp 3; the handle assembly 15 is lowered to fall on the idle rotating handle 161. At this time, the measuring camera 65 is located at the pre-adjusted position, and the bonding hole area of the indicating grating slide 4 can be clearly imaged on the measuring camera 65; the position of the indicating grating slide 4 is adjusted by the slide adjusting mechanism 5, so that the edge of the bonding hole coincides with the pre-marked positioning line in the field of view of the measuring camera 65. The idle rotating handle 161 is rotated to the non-idle position, so that the high-precision slide table 14 is stopped at the lower limit structure of the movable part 131; the position and angle of the indicating grating are adjusted by the indicating grating adjusting mechanism 1, the height of the indicating grating is finely adjusted by the Z-direction displacement table 13, and the reading of the digital dial gauge 2 is observed at the same time; when the reading is equal to the pre-marked value, it means that the gap between the indicating grating and the main grating 8 meets the design requirement; at this time, the image output by the measuring camera can show the Moire fringe effect formed by the indicating grating and the main grating; when the Moire fringe effect is not ideal, the angle and position of the indicating grating can be finely adjusted by the indicating grating adjusting mechanism 1; when the position and angle of the indicating grating correspond to the bonding hole 41, the Moire fringe reaches the ideal effect, and the edge or corner point of the indicating grating is bonded and fixed with the inner wall of the bonding hole, so that the assembly is completed.

Claims

1. A device for ensuring the integrity of the bonding gap of an optical encoder scale, characterized in that The device comprises an indicating grating adjusting mechanism (1), a digital dial micrometer (2), an indicating grating clamp (3), an indicating grating slide (4), a slide adjusting mechanism (5), and an optical imaging system (6). The indicating grating clamp can move horizontally, rotate and move vertically on the indicating grating adjusting mechanism, and its vertical position is monitored by the digital dial micrometer. The main grating (8) is fixed on the slide adjusting mechanism by the indicating grating slide, which can move horizontally and rotate on the slide adjusting mechanism. The indicating grating clamp can extend the indicating grating (9) clamped on its lower end into the bonding hole (41) on the indicating grating slide. The optical imaging system can image the bonding hole area on the indicating grating slide. The slide adjusting mechanism comprises a second XY displacement adjusting table (51) with a central through hole, a second rotary adjusting table (52), an adapter (53), two horizontal positioning clamps (54) and two vertical positioning clamps (55) fixed on the adapter. The second rotary adjusting table is arranged on the second XY displacement adjusting table, and the adapter is fixed on the second rotary adjusting table. The main grating (8) is arranged on the adapter. The indicating grating slide has four clamping points A, B, C and D which are the same as the clamping position of the indicating grating slide in actual work. The two horizontal positioning clamps and the two vertical positioning clamps press the four clamping points A, B, C and D respectively, and press the indicating grating slide on the main grating 8. The slide adjusting mechanism further comprises two pads (56) and two pressing fixing blocks (57). The two pads are fixed on both sides of the central through hole of the adapter, and the two pressing fixing blocks press and fix the two ends of the main grating on the two pads respectively. The two vertical positioning clamps are fixed on the two pads respectively. The two horizontal positioning clamps are fixed on the adapter through adjusting pads (58). The horizontal positioning clamp simulates a torsion spring, and the vertical positioning clamp simulates a compression spring, so that the horizontal clamping force and the vertical clamping force of the indicating grating slide are the same as the elastic force of the torsion spring and the compression spring in the actual working condition of the indicating grating slide.

2. The assurance device for indicating the bonding gap of the grating of the grating ruler according to claim 1, characterized in that The indicating grating adjusting mechanism comprises a first XY displacement adjusting table (11) with a central through hole, a first rotary adjusting table (12), and a Z-direction displacement table (13). The first rotary adjusting table is arranged on the first XY displacement adjusting table, and the Z-direction displacement table is fixed with the first rotary adjusting table. The indicating grating clamp is connected with the movable part (131) of the Z-direction displacement table, extends downward through the central through hole of the first XY displacement adjusting table and the first rotary adjusting table, and can be finely adjusted in height by the Z-direction displacement table. The digital dial micrometer is fixed on the first XY displacement adjusting table.

3. The assurance device for indicating the bonding gap of the grating of the grating ruler according to claim 2, characterized in that The indicating grating adjusting mechanism further comprises a high-precision slide table (14). The high-precision slide table is connected with the movable part and can slide vertically relative to the movable part. The indicating grating clamp is connected below the high-precision slide table. Upper and lower limit structures are arranged on the movable part.

4. The assurance device for indicating the bonding gap of the grating of the grating ruler according to claim 3, characterized in that The indication grating adjusting mechanism further comprises a handle assembly (15) and an adapter plate (16) with a central through hole; the handle assembly is fixedly connected with the high-precision slide table and can lift the high-precision slide table through the handle assembly; the adapter plate is fixed on the rotary adjusting table, and a stop handle (161) is arranged on the adapter plate; when the high-precision slide table falls, the handle assembly falls on the stop handle in the stop position; when the stop handle is in the non-stop position, the high-precision slide table is clamped on the lower limit structure of the movable part; the probe of the digital dial gauge contacts the upper surface of the handle assembly.

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

6. The assurance device for indicating the bonding gap of a grating scale according to claim 1, wherein Further comprising a supporting mechanism (7); the supporting mechanism (7) is composed of a supporting seat (71) with a central through hole and a bottom plate (72), and the supporting seat is fixed on the bottom plate; the indication grating adjusting mechanism is installed on the supporting seat, the slide adjusting mechanism is installed above the bottom plate, and the optical imaging system is installed below the bottom plate.

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