A reflective grating signal processing device

Abstract

The invention discloses a reflective grating signal processing device, which belongs to the field of precision measurement. The device comprises a mounting plate and a base. A light source is arranged on the lower side wall of the mounting plate, and a comb array is also arranged on the lower side wall of the mounting plate. A glass grating is arranged on the upper side wall of the base. The light source is used to send a light signal to the glass grating, and the grating lines of the glass grating are reflected back to the comb array. The comb array is used to convert the light signal into an electrical signal, so that the position of the glass grating can be quickly roughly adjusted or finely adjusted. The adjustment effect is ideal. The device has a simple structure and is easy to operate. After the adjustment, the position is stable and will not shake easily. During the adjustment, the signal strength is displayed in real time, thereby improving the accuracy of the light signal measurement.

Description

Technical Field

[0001] The present invention relates to the field of precision measurement, and more specifically, to a reflective grating signal processing device. Background Art

[0002] As an important component for linear displacement detection, precision reflective grating ruler is often used in the closed-loop servo system of CNC machine tools. As a linear displacement measurement feedback device, its measurement output signal is a digital pulse signal, which can be flexibly processed digitally. It has many advantages such as large detection range, high detection accuracy, fast response speed and strong anti-interference ability.

[0003] In the prior art, the reflective grating is very inconvenient to install and debug when in use, and the strength of the light signal cannot be intuitively obtained. Moreover, when in use, the conversion of the light signal into the electrical signal is not accurate enough. Finally, after adjustment, the position of the glass grating is not accurately adjusted and is easy to move, which further reduces the use effect of the grating.

[0004] To this end, we propose a reflective grating signal processing device to solve the above problems. Summary of the invention

[0005] 1. Technical Problems to be Solved In view of the problems existing in the prior art, the purpose of the present invention is to provide a reflective grating signal processing device, which can realize the rapid coarse or fine adjustment of the position of the glass grating, and the adjustment effect is ideal. At the same time, the structure is simple and easy to operate. After the adjustment, the position is stable and will not shake easily. At the same time, during the adjustment, the signal strength is displayed in real time to improve the accuracy of the optical signal measurement.

[0006] 2. Technical solution

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] A reflective grating signal processing device comprises a mounting plate and a base, wherein a light source is provided on the lower side wall of the mounting plate, and a comb array is also provided on the lower side wall of the mounting plate, and a glass grating is provided on the upper side wall of the base, wherein the light source is used to send a light signal to the glass grating, and the grating lines of the glass grating are reflected back to the comb array, and the comb array is used to convert the light signal into an electrical signal, wherein a plurality of photosensitive units are provided on the comb array, and a plurality of interference fringes are provided on the glass grating, and the positions of the plurality of photosensitive units correspond one-to-one to the interference fringes, and the comb array comprises a plurality of groups of four-column photosensitive surfaces and non-photosensitive surfaces, and the angles of the four-column photosensitive surfaces are 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively.

[0009] Furthermore, the side wall of the mounting plate is also provided with an anti-reflection film chip, which transmits the light source and is used to filter the light source so that only infrared light passes through, and the light source is emitted by an infrared wafer.

[0010] Furthermore, a strength indicator light is provided on the side wall of the base, which is electrically connected to the dressing array and is configured such that when the dressing array receives a strong light signal emitted by the glass grating, the light intensity emitted by the strength indicator light is strong, and when the dressing array receives a weak light signal emitted by the glass grating, the light intensity emitted by the strength indicator light is weak.

[0011] Furthermore, the upper side wall of the base is slidably connected to the glass grating, and the upper side wall of the base is also slidably connected to a storage groove, in which a ball screw is rotatably connected, and a sliding part is sleeved on the ball screw, which is slidably connected to the bottom of the storage groove, and the upper side wall of the sliding part is fixedly connected to the glass grating, and one end of the ball screw extends outside the glass grating and the base.

[0012] Furthermore, the lower end side wall of the storage groove is fixedly connected to the limiting block through a limiting spring, and the limiting block is generally in the shape of a prism or a prism, and the lower side wall area of ​​the limiting block is larger than the upper side wall area, and the lower end side wall of the limiting block is in contact with the upper end side wall of the base, and the limiting spring is in a compressed state to increase the friction between the base and the limiting block.

[0013] Furthermore, a pull rope is fixedly connected to the side wall of the upper end of the limit block, and the side wall of the storage groove is fixedly connected to the limit cylinder. The pull rope passes through the limit cylinder, and one end of the pull rope is fixedly connected to a hanging ring, and the outer diameter of the hanging ring is larger than the inner diameter of the limit cylinder, so that the limit ring is stuck near the tube mouth of the limit cylinder, and the pull rope is an elastic rope, one end of the ball screw is fixedly connected to a turntable, and the side wall of the turntable is fixedly connected to a plurality of hooks, the hooks correspond to the hanging rings, so that the hanging rings are hung on the hooks, and the plurality of hooks are distributed in a circular array with the center of the turntable, and the number of hooks is more than three.

[0014] Furthermore, a guide wheel is provided on the lower end side wall of the storage groove, and the pull rope passes through the guide wheel to change the moving direction of the pull rope, and the middle part of the limit cylinder is set in a spiral shape and is sleeved on the ball screw, and the inner diameter of the limit cylinder is larger than the outer diameter of the ball screw, so that the ball screw will not contact the limit cylinder when it rotates, and the limit cylinder is horizontally arranged at one end close to the guide wheel and coincides with the extension direction of the pull rope.

[0015] Furthermore, a plurality of slideways are provided at the upper end of the base, and a plurality of sliders are fixedly connected to the lower end sidewalls of the storage groove and the glass grating, and each slider is located in a slideway.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the present invention are as follows: (1) The device of this scheme processes the reflected optical signal into an electrical signal. First, when the infrared wafer on the single-field scan emits infrared light, it is reflected back to the comb array through the grating lines of the glass grating, and the comb array converts the optical signal into an electrical signal. To realize the conversion from optical signal to electrical signal and then to incremental signal, the arrangement of the photosensitive units of the comb array must be designed according to the interference fringes formed by the glass grating. The comb array of the device is composed of multiple groups of four-column photosensitive surfaces and non-photosensitive surfaces, so as to obtain two pairs of differential signals of sine and cosine. The electrical angle between the differential signals is 180 degrees, and the electrical angle of the sine and cosine signals is 90 degrees. The signal output by the array is first amplified, and then phase compensation and infrared light intensity compensation are performed to obtain a standard Lissajous diagram, and finally electronic subdivision processing is performed. At the same time, the device is provided with a signal strength indicator light, and installation and debugging are performed through this light. The single-field scan of the device is provided with an anti-reflection film lens, which only allows infrared light to pass through to prevent the influence of other light sources.

[0018] (2) Through reasonable comb array (single field scanning array) design, avoid signal instability and high installation requirements

[0019] (3) The arrangement of the single-field scanning (comb array) photosensitive units of the device must be designed according to the interference fringes formed by the glass grating. The comb array of the device is composed of multiple groups of four-column photosensitive surfaces and non-photosensitive surfaces, namely 0 degrees, 90 degrees, 180 degrees, and 270 degrees. Multiple groups form a single-field scanning unit, so that even if the grating scale surface is slightly contaminated, it will not affect the counting stability. The biggest feature of this scanning unit is that it integrates the infrared color circle with the comb array, signal amplification, phase compensation, and light source intensity compensation. Figure 1 As shown. Thus, two pairs of differential signals of sine and cosine are obtained, the electrical angle between the differential signals is 180 degrees, and the electrical angle of the sine and cosine signals is 90 degrees. The signal output by the array is first amplified, and then phase compensation and infrared light intensity compensation are performed to obtain a standard Lissajous diagram.

[0020] (4) By pushing the glass grating to move, the glass grating can be quickly moved to the specified position. At the same time, the ball screw can be rotated to drive the glass grating to move slowly, so as to perform fine adjustment. In addition, during the adjustment process, by observing the brightness of the strong and weak indicator lights, it can be quickly determined whether the glass grating is in the best position for light signal transmission and conversion, thereby improving the detection efficiency of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the position structure of the mounting base and the glass grating of the present invention;

[0022] Figure 2It is a schematic diagram of the infrared light source of the present invention irradiating the glass grating surface and then reflecting to the single-field scanning array;

[0023] Figure 3 It is a schematic diagram of the connection structure between the base and the glass grating of the present invention;

[0024] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at A in the middle.

[0025] Description of the numbers in the figure:

[0026] 1. Mounting base; 2. Base; 3. Light source; 4. Combing array; 5. Glass grating; 6. Photosensitive unit; 7. Interference fringes; 8. Anti-reflection film wafer; 9. Strong and weak indicator lights; 10. Storage slot; 11. Ball screw; 12. Sliding part; 13. Limit spring; 14. Limit block; 15. Pull rope; 16. Hanging ring; 17. Turntable; 18. Hook; 19. Guide wheel; 20. Slide; 21. Sliding block; 22. Limit cylinder. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention: Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as meaning any other terms.

[0029] To indicate or imply relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1:

[0031] See also Figure 1-Figure 4 A reflective grating signal processing device includes a mounting plate and a base 2. A light source 3 is provided on the lower side wall of the mounting plate, and a comb array 4 is also provided on the lower side wall of the mounting plate. A glass grating 5 is provided on the upper side wall of the base 2. The light source 3 is used to send a light signal to the glass grating 5. The grating lines of the glass grating 5 are reflected back to the comb array 4. The comb array 4 is used to convert the light signal into an electrical signal. A plurality of photosensitive units 6 are provided on the comb array 4. A plurality of interference fringes 7 are provided on the glass grating 5. The positions of the plurality of photosensitive units 6 correspond to the interference fringes 7. The comb array 4 includes a plurality of groups of four-column photosensitive surfaces and non-photosensitive surfaces. The angles of the four-column photosensitive surfaces are 0 degrees, 90 degrees, 180 degrees and 270 degrees, respectively. Furthermore, an anti-reflection film chip 8 is also provided on the side wall of the mounting plate. The anti-reflection film chip 8 passes through the light source 3 and is used to filter the light source 3 so that only infrared light passes through. The light source 3 is emitted by an infrared wafer.

[0032] Furthermore, the side wall of the base 2 is provided with a strong and weak indicator light 9, which is electrically connected to the dressing array 4 and is configured such that when the dressing array 4 receives a strong light signal emitted by the glass grating 5, the light intensity emitted by the strong and weak indicator light 9 is strong, and when the dressing array 4 receives a weak light signal emitted by the glass grating 5, the light intensity emitted by the strong and weak indicator light 9 is weak. Furthermore, the upper side wall of the base 2 is slidably connected to the glass grating 5, and the upper side wall of the base 2 is also slidably connected to a storage groove 10, in which a ball screw 11 is rotatably connected, and a sliding member 12 is sleeved on the ball screw 11, and the sliding member 12 is slidably connected to the bottom of the storage groove 10, and the upper side wall of the sliding member 12 is fixedly connected to the glass grating 5, and one end of the ball screw 11 extends to the outside of the glass grating 5 and the base 2.

[0033] The ball screw 11 is rotated, and the ball screw 11 drives the sliding member 12 to move back and forth, and the sliding member 12 drives the glass grating 5 to move, so that the position of the glass grating 5 can be fine-tuned to make it in the best position to receive the signal. Furthermore, the lower end side wall of the storage groove 10 is fixedly connected to the limit block 14 through the limit spring 13, and the limit block 14 is in the shape of a prism or a prism, and the lower side wall area of ​​the limit block 14 is larger than the upper side wall area, and the lower end side wall of the limit block 14 contacts the upper end side wall of the base 2, and the limit spring 13 is in a compressed state to increase the friction between the base 2 and the limit block 14.

[0034] After adjusting the positions of the glass grating 5 and the storage slot 10, the rebound force of the limit spring 13 can be used to make the limit block 14 press the base 2, so as to ensure the stability of the storage slot 10 and the glass grating 5 after the position adjustment. Further, the upper side wall of the limit block 14 is fixedly connected with a pull rope 15, the side wall of the storage slot 10 is fixedly connected with a limit cylinder 22, the pull rope 15 passes through the limit cylinder 22, one end of the pull rope 15 is fixedly connected with a hanging ring 16, and the outer diameter of the hanging ring 16 is greater than the inner diameter of the limit cylinder 22, so that the limit ring is stuck near the tube mouth of the limit cylinder 22, and the pull rope 15 is an elastic rope, one end of the ball screw 11 is fixedly connected with a turntable 17, and the side wall of the turntable 17 is fixedly connected with a plurality of hooks 18, the hooks 18 correspond to the hanging ring 16, so that the hanging ring 16 is hung on the hooks 18, and the plurality of hooks 18 are distributed in a circular array with the center of the turntable 17, and the number of hooks 18 is more than three. When the positions of the storage slot 10 and the glass grating 5 need to be adjusted, the rope 15 can be pulled to drive the rope 15 to move, and the rope 15 drives the limit block 14 to move so that it is separated from the base 2, so that no friction is generated, and then the hanging ring 16 is hung on the hook 18, and the ball screw 11 is pushed to move, so that the storage slot 10 and the glass grating 5 can be driven to move at the same time, so that the storage slot 10 and the glass grating 5 can be moved quickly.

[0035] The position of the glass grating 5 can be roughly adjusted quickly, and the structure is simple and the operation is convenient. Furthermore, a guide wheel 19 is arranged on the lower side wall of the storage groove 10, and the pull rope 15 passes through the guide wheel 19 to change the moving direction of the pull rope 15, and the middle part of the limit cylinder 22 is arranged in a spiral shape and is sleeved on the ball screw 11, and the inner diameter of the limit cylinder 22 is larger than the outer diameter of the ball screw 11, so that the ball screw 11 will not contact the limit cylinder 22 when rotating, and the limit cylinder 22 is arranged horizontally at one end close to the guide wheel 19, and coincides with the extension direction of the pull rope 15.

[0036] By setting the guide wheel 19, friction between the pull rope 15 and the spring can be avoided when adjusting the position of the limit block 14. At the same time, the limit block 14 can be pulled in the vertical direction to move, so that the position of the limit block 14 can be adjusted faster and more efficiently.

[0037] Furthermore, a plurality of slideways 20 are provided at the upper end of the base 2, and a plurality of sliders 21 are fixedly connected to the lower sidewalls of the storage groove 10 and the glass grating 5, and each slider 21 is located in a slideway 20. Through the cooperation of the slideways 20 and the sliders 21, the storage groove 10 and the glass grating 5 can be ensured to be stable during movement without violent shaking, thereby ensuring the safety of the entire device.

[0038] When the present invention is working, the glass grating 5 can be quickly moved to a specified position by pushing it to move, and the ball screw 11 can be rotated to drive the glass grating 5 to move slowly, so as to perform fine adjustment. In addition, during the adjustment process, by observing the brightness of the strong and weak indicator light 9, it can be quickly determined whether the glass grating 5 is in the best position for light signal transmission and conversion, thereby improving the detection efficiency of the entire device;

[0039] First, when the infrared circle on the single-field scan emits infrared light, it is reflected back to the comb array 4 through the grating lines of the glass grating 5, and the comb array 4 converts the optical signal into an electrical signal. To realize the conversion from optical signal to electrical signal and then to incremental signal, the arrangement of the photosensitive units 6 of the comb array 4 must be designed according to the Yu-related fringes 7 formed by the glass grating 5. The comb array 4 of the device is composed of multiple groups of four-column photosensitive surfaces and non-photosensitive surfaces, so as to obtain two pairs of sine and cosine differential signals. The electrical angle between the differential signals is 180 degrees, and the electrical angle of the sine and cosine signals is 90 degrees. The signal output by the array is first amplified, and then phase compensation and infrared light intensity compensation are performed to obtain a standard Lissajous diagram, and finally electronic subdivision processing is performed. At the same time, the device is provided with a signal strength indicator light 9, and installation and debugging are performed through this light. The single-field scan of the device is provided with an anti-reflection film lens, which only allows infrared light to pass through to prevent the influence of other light sources 3.

[0040] The above is only a preferred specific implementation of the present invention: but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0041] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A reflective grating signal processing device, comprising a mounting plate and a base (2), characterized in that: The lower end side wall of the mounting plate is provided with a light source (3), and the lower end side wall of the mounting plate is also provided with a comb array (4). The upper end side wall of the base (2) is provided with a glass grating (5). The light source (3) is used to send a light signal to the glass grating (5), which is reflected back to the comb array (4) through the grating lines of the glass grating (5). The comb array (4) is used to convert the light signal into an electrical signal. A plurality of photosensitive units (6) are provided on the comb array (4). A plurality of interference fringes (7) are provided on the glass grating (5), and the positions of the plurality of photosensitive units (6) correspond to the interference fringes (7) one by one. The comb array (4) includes a plurality of groups of Four columns of photosensitive surfaces and non-photosensitive surfaces, the angles of the four columns of photosensitive surfaces are 0 degrees, 90 degrees, 180 degrees and 270 degrees respectively; the upper end side wall of the base (2) is slidably connected to the glass grating (5), the upper end side wall of the base (2) is also slidably connected to a receiving groove (10), a ball screw (11) is rotatably connected in the receiving groove (10), a sliding member (12) is sleeved on the ball screw (11), the sliding member (12) is slidably connected to the bottom of the receiving groove (10), the upper end side wall of the sliding member (12) is fixedly connected to the glass grating (5), one end of the ball screw (11) extends to the glass grating (5) and The base (2) is outside; the lower side wall of the storage groove (10) is fixedly connected to the limiting block (14) through a limiting spring (13); the limiting block (14) is in the shape of a prism or a prism, and the lower side wall area of ​​the limiting block (14) is larger than the upper side wall area, and the lower side wall of the limiting block (14) contacts the upper side wall of the base (2), and the limiting spring (13) is in a compressed state to increase the friction between the base (2) and the limiting block (14); the upper side wall of the limiting block (14) is fixedly connected to a pull rope (15), and the side wall of the storage groove (10) is fixedly connected to the limiting cylinder (22), and the pull rope (15) passes through A limit tube (22), one end of the pull rope (15) is fixedly connected to a hanging ring (16), and the outer diameter of the hanging ring (16) is larger than the inner diameter of the limit tube (22), so that the limit ring is stuck near the tube mouth of the limit tube (22), and the pull rope (15) is an elastic rope, one end of the ball screw (11) is fixedly connected to a rotating disk (17), and the side wall of the rotating disk (17) is fixedly connected to a plurality of hooks (18), the hooks (18) correspond to the hanging ring (16), so that the hanging ring (16) is hung on the hooks (18), and the plurality of hooks (18) are distributed in a circular array with the center of the rotating disk (17), and the number of the hooks (18) is more than three;A guide wheel (19) is arranged on the side wall of the lower end of the storage groove (10), and the pull rope (15) passes through the guide wheel (19) to change the moving direction of the pull rope (15), and the middle part of the limiting cylinder (22) is arranged in a spiral shape and is sleeved on the ball screw (11), and the inner diameter of the limiting cylinder (22) is larger than the outer diameter of the ball screw (11), so that the ball screw (11) will not contact the limiting cylinder (22) when rotating, and the limiting cylinder (22) is arranged horizontally at one end close to the guide wheel (19) and coincides with the extension direction of the pull rope (15). ; 2. A reflective grating signal processing device according to claim 1, characterized in that: The side wall of the mounting plate is also provided with an anti-reflection film chip (8), the light source (3) passes through the anti-reflection film chip (8), the anti-reflection film chip (8) is used to filter the light source (3) so that only infrared light passes through, and the light source (3) is emitted by an infrared wafer.

3. A reflective grating signal processing device according to claim 2, characterized in that: A strong and weak indicator light (9) is provided on the side wall of the base (2). The strong and weak indicator light (9) is electrically connected to the dressing array (4) and is configured such that when the dressing array (4) receives a strong light signal emitted by the glass grating (5), the light intensity emitted by the strong and weak indicator light (9) is strong, and when the dressing array (4) receives a weak light signal emitted by the glass grating (5), the light intensity emitted by the strong and weak indicator light (9) is weak.

4. A reflective grating signal processing device according to claim 1, characterized in that: The upper end of the base (2) is provided with a plurality of slideways (20), the lower end side walls of the storage groove (10) and the glass grating (5) are fixedly connected with a plurality of sliders (21), and each slider (21) is located in a slideway (20).

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