Grinding device

Abstract

The utility model provides a grinding device which comprises a grinding medium disc, and grinding materials are arranged on the grinding medium disc. The moving platform is used for bearing the grinding medium disc and driving the grinding medium disc to move along a certain track; the driving mechanism provides driving power for the motion platform; the base is used for supporting the motion platform; the grinding disc is used for keeping the workpiece to abut against the grinding material on the grinding medium disc; the track is formed by superposition of x-axis simple harmonic motion and y-axis simple harmonic motion. According to the grinding device, only simple harmonic motion of the motion platform is executed, symmetrical grinding of the workpiece can be achieved, and the grinding effect of the workpiece is more centrosymmetric; in addition, the traversal degree of the motion trail formed by the grinding action to the abrasive paper is high, and the abrasive paper can be fully utilized without additionally arranging other linear motion driving devices.

Description

Technical Field

[0001] The utility model belongs to the field of grinding manufacturing, and in particular relates to a grinding device for polishing an end face. Background Art

[0002] Grinding is a process of micro-machining by using abrasives in a grinding tool to act on the surface of the workpiece. It can provide high-precision and high-quality surface treatment and is widely used in many fields.

[0003] Optical fiber communication is a cornerstone of the modern information society. The polishing of the end face of the optical fiber connector core is an indispensable part of the production of optical fiber connectors. Its quality directly affects the stability of optical fiber connection and the communication quality.

[0004] With the continuous efforts of researchers, the following grinding device schemes have been proposed and widely used.

[0005] 1) JP6835372B1

[0006] Japanese patent JP6835372B1 discloses an optical fiber ferrule end face grinding device, wherein a grinding disc is provided with a grinding sheet, and its rotating unit includes a revolution mechanism driving the turntable to revolve and a rotation mechanism driving the turntable to rotate. Under the joint drive of the revolution mechanism and the rotation mechanism, the grinding track of the grinding device is a circle of annular spiral line.

[0007] a) Low sandpaper utilization

[0008] Firstly, the grinding discs used in this grinding method are mainly round. The round grinding discs need to be cut from square grinding disc rolls, and the remaining scraps will be discarded, resulting in serious waste in the cutting process. Secondly, the circular grinding track will also make it impossible to fully utilize the center part of the grinding disc, resulting in further waste.

[0009] b) Serious mutual influence

[0010] Due to the revolution and rotation of the grinding medium disc, the grinding areas of all the inserts overlap. If there is dust or other impurities in one area of ​​the grinding sheet, it will affect all the inserts during the entire grinding process; there may also be a case where a insert is installed incorrectly, and the protruding insert will directly damage the sandpaper. During the grinding movement, the protruding insert will continue to damage other areas of the sandpaper, and finally cause a large area of ​​the grinding sheet to fail.

[0011] c) Low number of workpieces loaded

[0012] The grinding medium disk is circular, and only one circle of workpieces can be mounted on the grinding medium disk. That is to say, this solution can only grind this circle of workpieces each time, and the grinding efficiency is low.

[0013] 2) US6302763B1

[0014] In 2001, US Patent US6302763B1 disclosed a polishing device, which uses a main drive motor to drive the x platen and the y platen to reciprocate along the first path and the second path respectively with a predetermined timing relationship, so that the polishing member can move along a constant figure-8 polishing pattern.

[0015] a) Large vertex offset

[0016] In order to solve the problem of sandpaper waste, the use of artificial means, using a drive motor to drive the stage plate forward and backward to make linear motion, to improve the utilization rate of sandpaper. However, this linear motion destroys the central symmetry of the original constant 8-shaped motion, making the vertex offset of the ground ferrule end face worse.

[0017] b) Complex drive structure

[0018] This structure uses a total of three motion platforms, which are driven by two sets of independent drive units. The overall structure is complex.

[0019] 3) JP5714932B2

[0020] In 2015, Japanese patent JP5714932B2 disclosed a grinding device in which the grinding discs are arranged in a row. The grinding discs are driven by two motors to rotate in a circular motion and to drive the grinding clamps to make reciprocating linear motion, thereby realizing the grinding operation. The grinding trajectory is a number of spiral strips spread over the sandpaper. This method in which the grinding medium disc moves while the workpiece remains stationary can concentrate the mechanism for controlling the grinding accuracy on the support mechanism, reducing the consumable parts that must be replaced regularly to maintain the grinding accuracy of the workpiece. It takes into account the serious mutual influence between the core and impurities during the grinding process. The cores arranged side by side each have their own movement area and do not interfere with each other, but the cores in different rows have the same movement area, so the cores in different rows will still interfere with each other.

[0021] a) Large vertex offset

[0022] This grinding method has a high utilization rate of sandpaper, but the motion trajectory of drawing a circle while drawing a straight line destroys the force on the peripheral edge of the core end face, so that the vertex offset of the ground core end face is still large.

[0023] b) Low workpiece loading quantity

[0024] In order to solve the problem of serious mutual influence between the core inserts and impurities during the grinding process, the core inserts are arranged side by side in this solution, and only two rows are arranged. This will result in a small number of core inserts loaded in one grinding and low grinding efficiency.

[0025] The motion trajectories of the above schemes are all improvements based on circular motion. In order to improve the utilization rate of sandpaper, circular motion needs to be combined with another motion to realize the traversal of sandpaper. On the one hand, this destroys the central symmetry of the circular motion, resulting in an increase in the vertex offset of the core end face after grinding; on the other hand, the superposition of more motions will cause the motion mechanism of the grinding mechanism to become complicated.

[0026] Therefore, based on the defects of the above solutions, there is an urgent need for a grinding device that can solve the above problems at the same time. Utility Model Content

[0027] The utility model provides a grinding device to solve the problems of low sandpaper utilization rate, insufficient central symmetry of grinding effect (large vertex offset), poor end face curvature and low grinding efficiency in the existing grinding device.

[0028] The utility model provides a grinding device, comprising a grinding medium disc, on which a grinding material is arranged;

[0029] A motion platform that drives the grinding medium disc to move along a certain trajectory;

[0030] A driving mechanism provides driving power for the motion platform;

[0031] A base, used to support the motion platform;

[0032] A grinding disc, which is used to hold the workpiece in contact with the abrasive material on the grinding medium disc;

[0033] The motion trajectory is formed by superposition of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis.

[0034] Furthermore, the parametric equations for the x-axis motion and the y-axis motion are or Among them, w 1 / w 2 is any other positive real number not equal to 0.5, 1, or 2.

[0035] Preferably, w 1 and w 2 The relationship satisfies: 0.88≤w 1 / w 2 ≤1.12.

[0036] Preferably, w 1 and w 2 The relationship satisfies: w 1 / w2 =1.02.

[0037] Preferably, w 1 , a 1 , a 2 and w 2 The relationship is full of w 1 ×a 1 =w 2 ×a 2 .

[0038] Furthermore, the motion platform includes a y-axis platform, an x-axis platform, and a platform base plate, and a plurality of groups of first slide rail assemblies arranged along the y-axis direction are arranged between the y-axis platform and the platform base plate, and a plurality of groups of second slide rail assemblies arranged along the x-axis direction are arranged between the y-axis platform and the x-axis platform, and the first slide rail assembly and the second slide rail assembly both include a sliding plate, a slide rail seat, and a rolling element; the sliding plate is arranged parallel to the slide rail seat, and the rolling element is arranged between the sliding plate and the slide rail seat.

[0039] Preferably, there are two groups of driving mechanisms, each group of driving mechanisms includes a power unit, an output unit and a slider assembly, the power unit provides driving force in the driving mechanism, the output unit connects the power unit and the slider assembly, each moving platform is provided with a slide, the direction of the slide is perpendicular to the moving direction of the moving platform, the slide runs through the thickness direction of the platform, the slider assembly includes a slider and a slide rail, the slide rail is arranged parallel to the slide and fixed on both sides of the slide, the slider has a convex portion in the slide, and the slider is rotatably fixed on the output unit.

[0040] Furthermore, the power unit is an electric motor, which has a power shaft, and the output unit is an eccentric wheel, which includes a circular wheel disc and an output shaft, and the power shaft is located at the center of the circular wheel disc; the output shaft is located at an arbitrary radius of the circle and is set at a certain distance away from the center of the circle.

[0041] Preferably, the driving mechanism is a group, and the driving mechanism includes a power unit, an output unit and two sets of slider assemblies. The power unit is an electric motor, and the electric motor has a power shaft, and a driving gear is arranged on the power shaft. The output unit includes a first eccentric gear and a second eccentric gear, and the first eccentric gear has a first output shaft, and the first output shaft is located on any radius of the first eccentric gear and is set at a certain distance d away from the center of the circle. 1 and is rotatably connected with the corresponding slider, the second eccentric gear has a second output shaft, the second output shaft is located on any radius of the second eccentric gear and is set at a certain distance d away from the center of the circle 2and is rotationally connected with another slider, and the first eccentric gear and the second eccentric gear are meshed with the driving gear at the same time.

[0042] Preferably, the motion platform includes a first platform and a platform bottom plate, a universal ball is arranged between the first platform and the platform bottom plate, the grinding medium disk is arranged on the first platform, there are two groups of driving mechanisms, each group of driving mechanisms includes a power unit, an output unit and a slider assembly, the power unit provides driving force in the driving mechanism, the output unit connects the power unit and the slider assembly, the slider assembly includes a slider, and a first slide rail and a second slide rail perpendicular to each other are arranged on the first platform, the first slide rail is parallel to the y-axis direction, the slider is slidably connected to the first slide rail and the second slide rail respectively, the driving mechanism pushes the first slide rail to make the first platform move along the x-axis direction relative to the platform bottom plate, and the driving mechanism pushes the second slide rail to make the first platform move along the y-axis direction relative to the platform bottom plate.

[0043] Furthermore, the power unit includes an x-axis drive motor and a y-axis drive motor, the x-axis drive motor has an x-axis drive gear, the y-axis drive motor has a y-axis drive gear, the output units are all eccentric gears, the x-axis drive gear and the y-axis drive gear are meshed with their corresponding eccentric gears, the eccentric gears include a circular gear plate, an output rod and a connecting rod mechanism, the connecting rod mechanism includes a connecting rod, a push rod, and a guide block, one end of the connecting rod can be rotatably sleeved on the output rod, the other end of the connecting rod can be rotatably connected to one end of the push rod, the other end of the push rod is fixedly connected to the slider, the push rod can be slidably set in the guide hole of the first guide block, and the first guide block is fixed on the platform bottom plate.

[0044] Furthermore, a third slide rail and a fourth slide rail perpendicular to each other are also provided on the first platform, the third slide rail and the first slide rail are arranged in parallel, and are respectively arranged on two side surfaces of the first platform parallel to the x-axis direction, the fourth slide rail and the second slide rail are arranged in parallel, and are respectively arranged on two side surfaces of the first platform parallel to the y-axis direction, the third slide rail and the fourth slide rail are both provided with sliders, the sliders are connected with guide rods, the guide rods can be slidably set in the guide holes of the second guide blocks, and the axis of the guide holes of the first guide blocks is in the same straight line as the axis of the guide holes on the second guide blocks.

[0045] Beneficial Effects

[0046] In order to achieve the central symmetry of the core grinding effect, each motion component of the grinding medium disk needs to be completely centrally symmetrical. The grinding device provided by the utility model has a motion trajectory of the grinding medium disk formed by the superposition of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis. The simple harmonic motion has the characteristic that each motion component is completely centrally symmetrical, which enables the grinding device provided by the utility model to only perform the simple harmonic motion of the motion platform, and can achieve symmetrical grinding of the workpiece, making the grinding effect of the workpiece more centrally symmetrical; at the same time, the motion trajectory formed by its grinding action has a high degree of traversal of the sandpaper, and there is no need to add other linear motion driving devices to achieve full utilization of the sandpaper.

[0047] The researchers found that the grinding trajectory depends largely on the frequencies of the two simple harmonic motions. 1 / w 2 When w is equal to 0.5, 1, 2, etc., the motion trajectory is very simple. 1 / w 2 When it is equal to 1, equal Then the trajectory of motion is a reciprocating line segment or circle; Not equal to Then the motion trajectory is an inclined ellipse; when w 1 / w 2 When w is equal to 0.5 or 2, the motion trajectory is an "8" shape. If the "8"-shaped grinding trajectory can make the vertex offset small, but the grinding medium disc is grinding the workpiece in this trajectory, the sandpaper utilization rate is extremely low, resulting in frequent sandpaper replacement, which seriously reduces production efficiency. 1 / w 2 When it is other values, the motion trajectory is relatively dense, the degree of traversal of the sandpaper is high, and the utilization rate of the sandpaper is high. When grinding according to this motion trajectory, the symmetrical grinding of the workpiece can be achieved by only executing the simple harmonic motion of the motion platform. At the same time, there is no need to add other movements, such as linear motion, which can greatly improve the utilization rate of the sandpaper.

[0048] In addition, due to the different frequencies of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis, if the grinding trajectory has a large difference in the movement distance of the x-axis and the y-axis in the same time, the grinding effect of the workpiece end face at different angles will be quite different after the grinding is completed, resulting in a large difference in the curvature radius of the workpiece end face at different angles. Taking the ferrule of the optical fiber connector as an example, a curvature radius that is too large or too small will affect the communication quality. A curvature radius that is too small will apply greater pressure to the optical fiber, while a curvature radius that is too large will not apply pressure to the optical fiber, resulting in an air gap between the connector and the optical fiber end face. When the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis satisfy: 0.88≤w 1 / w 2When ≤1.12, the problem of large difference in the movement distance of the grinding track on the x-axis and the y-axis can be significantly eliminated, so that the grinding curvatures of different angles of the ferrule end face can meet the use requirements.

[0049] Finally, in order to further solve the problem of the difference in curvature of the ferrule end face, the amplitude of the simple harmonic motion of the x-axis and the y-axis can be different, for example, w 1 ×a 1 =w 2 ×a 2 This can make the reciprocating motion in the direction with a faster cycle smaller, so as to coordinate the total distance of the grinding medium disk in the x-axis direction with the total distance in the y-axis direction. This can make the degree of grinding at all angles of the ferrule end face consistent, ensuring the benign docking of the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 It is a schematic diagram of the three-dimensional structure of the grinding device in this application;

[0052] Figure 2 is a schematic structural diagram of a motion platform of a two-layer motion platform in Example 1;

[0053] Figure 3 yes Figure 2 A partial enlarged view of the middle A area;

[0054] Figure 4 is an exploded schematic diagram of the motion platform and the output part in Example 1;

[0055] Figure 5 is a perspective top view of the motion platform and the output portion in Example 1;

[0056] Figure 6 is a schematic structural diagram of the output part and the power part of the driving mechanism in Example 1;

[0057] Figure 7 is a schematic diagram of the grinding trajectory of the grinding device in Example 1;

[0058] Figure 8 It is the interferometric measurement data of the ceramic ferrule end face after grinding;

[0059] Fig. 9is a schematic structural diagram of a grinding device driven by a single motor and driven by gear meshing in Example 2;

[0060] Fig.10 is a front view of the motion platform and the output part in Example 3;

[0061] Fig.11 is a top view of the motion platform and the output portion in Example 3;

[0062] Fig.12 is a schematic structural diagram of a connecting rod mechanism in another embodiment;

[0063] Fig.13 is a schematic structural diagram of a grinding device with a single-layer moving platform in another embodiment;

[0064] Fig.14 is a schematic structural diagram of a grinding device with a push rod driving structure in another embodiment;

[0065] Fig.15 Schematic diagram of the structure of a grinding device with a single motor drive and belt transmission in another embodiment.

[0066] Description of reference numerals:

[0067] 100. Grinding device; 1. Grinding medium disk; 2. Motion platform; 21. Y-axis platform; 22. X-axis platform; 221. Slideway; 23. Platform bottom plate; 24a. First slide rail assembly; 24b. Second slide rail assembly; 241. Slide plate; 242. Slide rail seat; 243. Roller; 244. Rolling groove; 25. First platform; 251. First slide rail; 253. Third slide rail; 254. Fourth slide rail; 252. Second slide rail; 26. Roller; 3. Driving mechanism; 31. Power unit; 311. Power shaft; 312. Driving gear; 313. X-axis platform; 314. Slide plate; 315. Slide plate; 316. Slide plate; 317. Slide plate; 318. Slide plate; 319. Slide plate; 320. Slide plate; 321. Slide plate; 322. Slide plate; 323. Slide plate; 324. Slide plate; 325. Slide plate; 326. Slide plate; 327. Slide plate; 328. Slide plate; 329. Slide plate; 330. Slide plate; 331. Slide plate; 332. Slide plate; 333. Slide plate; 334. Slide plate; 335. Slide plate; 336. Slide plate; 337. Slide plate; 338. Slide plate; 339. Slide plate; 340. Slide plate; 341. Slide plate; 342. Slide plate; 343. Slide plate; 344. Slide plate; 345. Slide plate; 346. Slide plate; 347. S Axis drive gear; 314, y-axis drive gear; 32, output part; 321, circular wheel disc; 322, output shaft; 323, first eccentric gear; 3231, first output shaft; 324, second eccentric gear; 3241, second output shaft; 325, circular toothed disc; 326, output rod; 327, connecting rod mechanism; 3271, connecting rod; 3272, push rod; 3273, first guide block; 328, guide rod; 329, second guide block; 33, slider assembly; 331, slider; 3331, convex part; 332, slide rail; 4, base; 5, grinding disc. DETAILED DESCRIPTION

[0068] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0069] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The grinding device of the present invention can be used for grinding products that have requirements for end surface flatness, such as the ferrule, stator, rotor, mold ejector pin, bearing components, etc. of the optical fiber connector. They are not described one by one here. The grinding device in the present invention is explained below by taking the grinding of the ferrule of the optical fiber connector as an example.

[0072] Example 1

[0073] This embodiment provides a grinding device 100, such as Figure 1 As shown, it includes a grinding medium disc 1, on which a grinding material is arranged;

[0074] A motion platform 2, which carries the grinding medium disc 1 and drives the grinding medium disc 1 to move along a certain trajectory;

[0075] The driving mechanism 3 provides driving power for the motion platform 2;

[0076] A base 4, used for supporting the motion platform 2;

[0077] A grinding disc 5, which is used to keep the end face of the insert in contact with the grinding material on the grinding medium disc 1;

[0078] The motion trajectory is the superposition of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis.

[0079] In this embodiment, the grinding medium disc 1 is square, and the grinding material is cut into squares, and the grinding material is sandpaper. On the one hand, the square grinding material is easy to cut, and each grinding material only needs to be cut in a straight line; on the other hand, the square grinding material will basically not have excess waste during the cutting process, which can improve the utilization rate of the grinding material.

[0080] In this embodiment, the grinding device also includes a lifting platform, and the motion platform is fixed on the lifting platform. The lifting platform can control the lifting of the motion platform to achieve the contact between the end face of the ferrule and the grinding material. In addition, the designer can also control the rise or fall of the grinding disc through other devices according to needs to achieve the purpose of the end face of the ferrule abutting against the grinding material.

[0081] like Figure 2-Figure 3 As shown, the motion platform 2 includes a y-axis platform 21, an x-axis platform 22, and a platform base plate 23. The platform base plate 23 is fixed on the base 4. The driving mechanism 3 drives the y-axis platform 21 to move along the y-axis direction relative to the platform base plate 21, and the driving mechanism 3 drives the x-axis platform 22 to move along the x-axis.

[0082] The motion platform adopts a design of two-layer motion platforms moving independently, which can conveniently, simply and directly control the motion platform to move along the x-axis and y-axis respectively.

[0083] Several groups of first slide rail assemblies 24 a arranged along the y-axis direction are arranged between the y-axis platform 21 and the platform base plate 23 , and several groups of second slide rail assemblies 24 b arranged along the x-axis direction are arranged between the y-axis platform 21 and the x-axis platform 22 .

[0084] The first slide rail assembly and the second slide rail assembly have the same structure, and the first slide rail assembly is taken as an example for description.

[0085] The first slide rail assembly 24a includes a slide plate 241, a slide rail seat 242 and a rolling member 243. The slide plate 241 is fixed on the y-axis platform 21, the slide rail seat 242 is fixed on the platform bottom plate 23, the slide plate 241 and the slide rail seat 242 are arranged opposite to each other, and the rolling member 243 is arranged between the slide plate 241 and the slide rail seat 242, and the rolling member plays a role of facilitating sliding and supporting.

[0086] The sliding plate 241 and the rail seat 242 are both provided with rolling grooves 244, and the rolling element 243 in the rolling grooves 244 is a cylindrical roller. In other embodiments, the rolling element can also be other rolling structures, such as a spherical roller.

[0087] Compared with ball rollers, cylindrical rollers have a larger total contact area with the rolling groove, so the rail assembly can bear a larger load; while the total contact area between the ball roller and the rolling groove is smaller, so the friction resistance generated during the sliding process of the rail assembly is smaller. The choice of rolling element type can be determined according to the actual needs of the technicians.

[0088] In a preferred embodiment, the driving mechanism 3 is two, such as Figure 4-6 As shown, each set of driving mechanism 3 includes a power unit 31, an output unit 32 and a slider assembly 33. The power unit 31 provides driving force in the driving mechanism 3. The output unit 32 connects the power unit 31 and the slider assembly 33. A slideway 221 is provided on each motion platform (here refers to the y-axis platform or the x-axis platform). The direction of the slideway 221 is perpendicular to the motion direction of the motion platform. The slideway 221 runs through the thickness direction of the platform. The slider assembly 33 includes a slider 331 and a slide rail 332. The slide rail 332 is fixedly arranged on the back of the motion platform. The slider 331 is slidably connected to the slide rail 332. Each set of slide rails 332 is arranged parallel to the slideway 221 and fixed on both sides of the slideway 221. The slider 331 has a convex portion 3331 in the slideway 221. The slider 331 is fixed on the output unit 32. In this way, the movement of the power unit 31 pushes the slider 331 to move through the output unit 32, and the slider 331 pushes the motion platform to move along its motion direction.

[0089] The setting of the slider assembly and the slideway ensures that the y-axis platform and the x-axis platform can move independently without affecting each other.

[0090] The power part 31 is an electric motor, which has a power shaft 311. The output part 32 is an eccentric wheel, which includes a circular wheel disc 321 and an output shaft 322. The power shaft 311 is fixed to the center of the circular wheel disc; the output shaft 322 is located at a certain distance d away from the center of the circle on any radius of the circle, and the output shaft 322 passes through the hole on the slider 331.

[0091] The eccentric wheel and the slider assembly are arranged in cooperation to convert the rotational motion of the motor into the linear reciprocating motion of the motion platform, thereby realizing the reciprocating grinding action.

[0092] Of course, in other embodiments, the electric motor may be replaced by a mechanism driven to rotate by other fluid media, such as a pneumatic motor or a hydraulic motor.

[0093] Since the reciprocating linear motion of the y-axis platform and the x-axis platform is converted from the rotation of the motor, the law of the movement position of the y-axis platform and the x-axis platform changing with time can be exactly represented by the above-mentioned simple harmonic motion.

[0094] In this way, the parametric equation of the reciprocating motion equation of the y-axis platform and the x-axis platform is expressed as where x (t)is the displacement of the x-axis platform along the x-axis direction over time, y (t) is the displacement of the y-axis platform along the y-axis direction over time, a 1 is the amplitude of the x-axis platform motion, a 2 is the amplitude of the y-axis platform motion, w 1 is the speed of the motor driving the x-axis platform, w 2 is the speed of the motor driving the y-axis platform, t is the time, is the initial phase of the x-axis platform, is the initial phase of the y-axis platform.

[0095] Due to the different frequencies of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis, it is easy to cause the grinding curvature of the ferrule end face at different angles to be quite different after grinding. Too large or too small curvature will affect the communication quality. Therefore, in order to avoid this problem as much as possible, w 1 and w 2 Should be as close as possible. 1 and w 2 The relationship can be preferably satisfied as follows: 0.88≤w 1 / w 2 ≤1.12. The simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis satisfy: 0.88≤w 1 / w 2 When ≤1.12, the problem of large difference in the movement distance of the grinding track on the x-axis and the y-axis can be significantly eliminated, so that the grinding curvatures of different angles of the ferrule end face can meet the use requirements.

[0096] In order to further improve the problem of large difference in curvature of the ferrule end face, it is possible to consider using w 1 ×a 1 =w 2 ×a 2 This can make the reciprocating motion in the direction with a faster cycle smaller, so as to coordinate the total distance of the grinding medium disk in the x-axis direction with the total distance in the y-axis direction. This can make the degree of grinding at all angles of the ferrule end face consistent, ensuring the benign docking of the optical fiber.

[0097] More specifically, in this embodiment, a 1 =4.9, a 2 =5, a 2 / a 1 =1.02, w 1 / w 2 Preferably 1.02,

[0098] w 1 / w 2=1.02, the motion trajectory is relatively dense, the coverage rate of the motion trajectory on the sandpaper is high, and a high utilization rate of the sandpaper can be achieved.

[0099] When the R&D personnel grind the ceramic ferrule with a radius r of 1.25 mm, the motion trajectory of the grinding medium disk is as follows: Figure 7 As shown, a square track area of ​​9.8 mm × 10 mm is roughly formed, the movement starting point is located at the center of the square, the movement track is centrally symmetrical and axially symmetrical, and after several cycles, the grinding medium disk returns to the initial position.

[0100] Determine the width of the track in the x-axis direction as A 1 =2×a+2×r=12.5mm, the width of the track in the y-axis direction is determined to be A 2 =2×a+2×r=12.3mm, the center-to-center spacing of the ferrule in the x-axis direction is L 1 The center-to-center spacing of the ferrule in the y-axis direction is L. 2 The grinding track of several ferrules will fill the entire sandpaper. After grinding, the sandpaper is divided into multiple relatively independent areas, and the adjacent areas are in contact with each other, and the overall sandpaper utilization rate is good; in addition, the ceramic ferrules ground by the above track are tested, and the test results are shown in Figure 8 The vertex offset has good consistency, the standard deviation of the ten test samples is 1.28, and the vertex offset value is small, the maximum measured value is 6.19um, the minimum measured value is 2.05um, and the average measured value is 4.7um, which is within 6um as a whole (the allowable range of vertex offset of PC type connector is ≤50um).

[0101] It can be seen that the cores ground by the grinding medium disk moving along the above motion trajectory have very small vertex deviation and good overall consistency; and because the grinding area of ​​each core is relatively independent, there is no mutual interference. In addition, by moving along the above motion trajectory, the symmetrical grinding of the cores can be achieved by simply performing the simple harmonic motion of the motion platform, and at the same time, the utilization rate of the sandpaper is greatly improved.

[0102] As for whether to use the sine function or the cosine function to represent the parameter equation, it can be determined by the designer based on the initial phase of the motor, and it is well known to those skilled in the art that the sine function and the cosine function can be converted into each other.

[0103] Example 2

[0104] This embodiment provides a grinding device. Different from the first embodiment, the driving mechanism of the grinding device in this embodiment is a single power source, that is, the platform is driven to move in two directions by a single power source.

[0105] The R&D personnel found that there were some problems with the structure of multiple power sources. First, the movement of the motion platform requires the cooperation of two different power sources. In order to keep the two different power sources at a relatively stable frequency, it is difficult to unify the consistency in operation because the two power sources are controlled separately. This makes the motion platform often very different from the expected motion trajectory. Second, two power sources mean more structures and pipeline arrangements, which makes the structure of the grinding device more complicated, more expensive, and less convenient to maintain.

[0106] Therefore, this embodiment provides a grinding device, including a grinding medium disk, on which grinding material is arranged; a moving platform, which carries the grinding medium disk and drives the grinding medium disk to move along a certain trajectory; a driving mechanism, which provides driving power for the moving platform; a base, which is used to support the moving platform; and a grinding disk, which is used to keep the insert in contact with the grinding material on the grinding medium disk.

[0107] The motion platform includes a y-axis platform, an x-axis platform, and a platform base plate. There is one driving mechanism, which includes a power unit, an output unit, and two sets of slider assemblies. The power unit is an electric motor. In other embodiments, it can also be a pneumatic motor or a hydraulic motor.

[0108] like Fig. 9 As shown, the motor has a power shaft 311, and a driving gear 312 is arranged on the power shaft 311. The output part 32 includes a first eccentric gear 323 and a second eccentric gear 324. The first eccentric gear 323 has a first output shaft 3231. The first output shaft 3231 is located on any radius of the first eccentric gear 323 and is set at a certain distance d away from the center of the circle. 1 The second eccentric gear 324 has a second output shaft 3241, and the second output shaft 3241 is located on any radius of the second eccentric gear 324 and is set at a certain distance d away from the center of the circle. 2 and is rotationally connected to another slider 331 , and the first eccentric gear 323 and the second eccentric gear 324 are simultaneously meshed with the driving gear 312 .

[0109] d 1 and d 2 The values ​​of d and d respectively determine the upward travel of the motion platform in the y-axis direction and the x-axis direction. 1 and d 2 The selection of the value can be determined according to the needs of the designer.

[0110] The motor drives two eccentric gears at the same time, and drives two sets of slider assemblies to make circular motion. The slider converts the circular motion into the reciprocating linear motion of the motion platform, realizing the reciprocating grinding action.

[0111] In addition, the two eccentric gears are driven simultaneously, so that the two groups have the same sliding motion state, and the cooperation between them is conducive to realizing the grinding medium disc according to the pre-designed motion trajectory, thereby achieving a better grinding effect.

[0112] At this time, the parametric equations of the motion equation in the y-axis direction and the motion equation in the x-axis direction are The angular velocity w of the first eccentric gear 1 =z×w / z 1 , the angular velocity w of the first eccentric gear 2 = z*w / z 2 , where z is the number of teeth of the driving gear, w is the speed of the motor, and the tooth ratio between the eccentric gear and the driving gear determines the angular velocity of the eccentric gear, that is, the rotation frequency.

[0113] In a preferred embodiment, (z 1 / z) / (z 2 / z)=0.9, and can also be 0.85, 0.95, 1.05, 1.35, 1.56 and other values. The trajectory formed by these values ​​has a shorter movement cycle, and multiple movement cycles can be completed within a certain grinding time, making the grinding more precise.

[0114] In another embodiment, the driving gear includes a first driving gear and a second driving gear, and the first eccentric gear and the first driving gear and the second eccentric gear and the second driving gear are connected by a chain.

[0115] In another embodiment, the first eccentric gear and the second eccentric gear are simultaneously connected to the driving gear by a toothed belt.

[0116] Example 3

[0117] This embodiment provides a grinding device. Different from the above-mentioned embodiment, the moving platform of the grinding device in this embodiment is a single-layer platform.

[0118] A grinding device comprises a grinding medium disk on which grinding material is arranged; a moving platform which carries the grinding medium disk and drives the grinding medium disk to move along a certain trajectory; a driving mechanism which provides driving power for the moving platform; a base which is used to support the moving platform; and a grinding disk which is used to keep an insert in contact with the grinding material on the grinding medium disk.

[0119] like Fig.10 and Fig.11As shown, the motion platform includes a first platform 25 and a platform base plate 23. The driving mechanism 3 can drive the first platform 25 to move relative to the platform base plate 23 along the x-axis direction and the x-axis direction. The first platform 25 is provided with a first slide rail 251 and a second slide rail 252 perpendicular to each other. The first slide rail 251 is parallel to the y-axis direction. There are two groups of driving mechanisms. Each group of driving mechanisms 3 includes a power unit 31, an output unit 32 and a slider assembly 33. The slider assembly 33 includes a slider 331. The power unit provides driving force in the driving mechanism. The output unit connects the power unit and the slider 331. The slider 331 is slidably connected to the first slide rail 251 and the second slide rail 252. The driving mechanism 3 pushes the first slide rail 251 to move the first platform 25 relative to the platform base plate along the x-axis direction. The driving mechanism 3 pushes the second slide rail 252 to move the first platform relative to the platform base plate along the y-axis direction.

[0120] The motion platform in this embodiment adopts a single-layer motion platform design, which greatly simplifies the motion platform structure, has good visibility, is more convenient to use and operate, and is more convenient to repair and maintain.

[0121] A plurality of rolling bodies 26 are arranged between the platform bottom plate 23 and the first platform 25 . The upper surface of the platform bottom plate 23 has corresponding grooves of the same shape as the rolling bodies 25 , and the rolling bodies 26 are arranged inside the grooves.

[0122] The rolling body plays a role of supporting the first platform on the one hand, and facilitates the mutual movement between the y-axis platform and the platform bottom plate on the other hand.

[0123] In a preferred embodiment, the rolling bodies 26 are a plurality of universal balls installed in the platform bottom plate 23, and the universal balls abut against the concave surface on the back of the first platform 25. Compared with the multi-layer platform application, the platform weight is generally borne by the spherical rollers in the slide rails. Due to the limited number of spherical rollers, the total weight that the multi-layer platform can bear is often very limited. The universal balls are arranged between the first platform and the platform bottom plate. Compared with the structure of the multi-layer platform, the total contact area between the universal balls and the first platform is much larger, so the bearing capacity of the single-layer platform will also be greatly enhanced.

[0124] In this example, the power unit 31 includes an x-axis drive motor and a y-axis drive motor. The x-axis drive motor has an x-axis drive gear 313, and the y-axis drive motor has a y-axis drive gear 314. The output parts are both eccentric gears 323. The x-axis drive gear 313 and the y-axis drive gear 314 are meshed with their corresponding eccentric gears. The eccentric gears include a circular toothed disc 325, an output rod 326, and a connecting rod mechanism 327. The specific structure of the connecting rod mechanism 327 is as follows: Fig.12As shown, the connecting rod mechanism 327 includes a connecting rod 3271, a push rod 3272, and a guide block 3253. One end of the connecting rod 3271 can be rotatably sleeved on the output rod 326, and the other end of the connecting rod 3271 and one end of the push rod 3272 can be rotatably connected together. The other end of the push rod 3272 is fixedly connected to the slider 331. The push rod 3272 can be slidably set in the guide hole of the first guide block 3273, and the first guide block 3273 is fixed on the platform base plate 23.

[0125] Thus, the connecting rod mechanism can transform the continuous rotation of the driving gear into the linear reciprocating motion of the push rod along the direction of the guide hole, thereby pushing the motion platform to continuously reciprocate in a certain direction.

[0126] In another embodiment, if Fig.13 As shown, the first platform 25 is also provided with a third slide rail 253 and a fourth slide rail 254 which are perpendicular to each other. The third slide rail 253 and the first slide rail 251 are arranged in parallel, and are respectively arranged on the two side surfaces of the first platform 25 parallel to the x-axis direction. The fourth slide rail 254 and the second slide rail 252 are arranged in parallel, and are respectively arranged on the two side surfaces of the first platform 25 parallel to the y-axis direction. The third slide rail 253 and the fourth slide rail 254 are both provided with a slider 331, and the slider 331 is connected with a guide rod 328, and the guide rod 328 can be slidably set in the guide hole of the second guide block 329, and the axis of the guide hole of the first guide block 3273 is in the same straight line with the axis of the guide hole on the second guide block 329.

[0127] The four slide rails are symmetrically arranged on the four sides of the first platform to guide the movement of the first platform from two opposite sides at the same time, which can greatly reduce the tendency of the first platform to twist due to force on only one side of the first platform, making the grinding movement smoother and more stable.

[0128] In another embodiment, if Fig.14 As shown, the power unit 31 can also be an electric push rod, or a hydraulic push rod or a pneumatic push rod. The movable end of the electric push rod is fixedly connected to the slider 331 and drives the platform to perform reciprocating linear motion.

[0129] In another embodiment, if Fig.15As shown, the motion platform includes a first platform 25 and a platform base plate 23. The driving mechanism 3 can drive the first platform 25 to move relative to the platform base plate 23 along the x-axis direction and the x-axis direction. The first platform 25 is provided with a first slide rail 251 and a second slide rail 252 perpendicular to each other. The first slide rail 251 is parallel to the y-axis direction. There is one driving mechanism, and each group of driving mechanisms 3 includes a power unit 31, an output unit 32 and a slider 33. The power unit provides driving force in the driving mechanism, and the output unit connects the power unit and the slider. The slider 33 is slidably connected with the first slide rail 251 and the second slide rail 252. The driving mechanism 3 pushes the first slide rail 251 to move the first platform 25 relative to the platform base plate along the x-axis direction, and the driving mechanism 3 pushes the second slide rail 252 to move the first platform relative to the platform base plate along the y-axis direction.

[0130] The electric motor has a power shaft 311, on which a driving gear 312 is arranged, and the output part 32 includes a first eccentric gear 323 and a second eccentric gear 324. The first eccentric gear 323 has a first output shaft 3231, which is located on any radius of the first eccentric gear 323 and is set at a certain distance d1 away from the center of the circle, and is rotatably connected to the corresponding slider 331. The second eccentric gear 324 has a second output shaft 3241, which is located on any radius of the second eccentric gear 324 and is set at a certain distance d2 away from the center of the circle, and is rotatably connected to another slider 331. The first eccentric gear 323 and the second eccentric gear 324 are simultaneously connected to the driving gear 314 with a toothed belt.

[0131] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A grinding device, comprising a grinding medium disc, on which a grinding material is disposed; A motion platform, which drives the grinding medium disc to move along a certain motion trajectory; A driving mechanism, providing driving power for the motion platform; A base, used to support the motion platform; A grinding disc, the grinding disc is used to fix the workpiece and keep the workpiece in contact with the grinding material on the grinding medium disc; It is characterized in that the motion trajectory is formed by superposition of simple harmonic motion of the x-axis and simple harmonic motion of the y-axis, and the x-axis and the y-axis are perpendicular to each other.

2. The grinding device according to claim 1, characterized in that: The parametric equations of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis are or Wherein, w1 / w2 is other positive real number not equal to 0.5, 1, 2, etc.

3. The grinding device according to claim 2, characterized in that: The relationship between w1 and w2 satisfies: 0.88≤w1 / w2≤1.

12.

4. The grinding device according to claim 3, characterized in that: w1 / w2=1.

02.

5. The grinding device according to claim 3, characterized in that: The relationship among w1, a1, a2 and w2 satisfies: w1×a1=w2×a2.

6. The grinding device according to any one of claims 1 to 5, characterized in that: The motion platform includes a y-axis platform, an x-axis platform, and a platform base plate. Several groups of first slide rail assemblies arranged along the y-axis direction are arranged between the y-axis platform and the platform base plate. Several groups of second slide rail assemblies arranged along the x-axis direction are arranged between the y-axis platform and the x-axis platform. The first slide rail assembly and the second slide rail assembly both include a sliding plate, a slide rail seat, and a rolling member. The sliding plate is arranged in parallel with the slide rail seat, and the rolling member is arranged between the sliding plate and the slide rail seat.

7. The grinding device according to claim 6, characterized in that: There are two groups of driving mechanisms, each of which includes a power unit, an output unit and a slider assembly. The power unit provides driving force in the driving mechanism, and the output unit connects the power unit and the slider assembly. A slide is provided on each motion platform, and the direction of the slide is perpendicular to the motion direction of the motion platform, and the slide runs through the thickness direction of the platform. The slider assembly includes a slider and a slide rail, and the slide rail is arranged parallel to the slide and fixed on both sides of the slide. The slider has a convex portion in the slide, and the slider is rotatably fixed on the output unit.

8. The grinding device according to claim 7, characterized in that: The power part is an electric motor, which has a power shaft. The output part is an eccentric wheel, which includes a circular wheel disc and an output shaft. The power shaft is located at the center of the circular wheel disc. The output shaft is located at an arbitrary radius of the circle and is set at a certain distance away from the center of the circle.

9. The grinding device according to claim 6, characterized in that: The driving mechanism is a group, and the driving mechanism includes a power part, an output part and two groups of slider assemblies. The power part is an electric motor, and the electric motor has a power shaft. A driving gear is arranged on the power shaft. The output part includes a first eccentric gear and a second eccentric gear. The first eccentric gear has a first output shaft, and the first output shaft is located on any radius of the first eccentric gear and is set at a certain distance d1 away from the center of the circle, and is rotatably connected to the corresponding slider. The second eccentric gear has a second output shaft, and the second output shaft is located on any radius of the second eccentric gear and is set at a certain distance d2 away from the center of the circle, and is rotatably connected to another slider. The first eccentric gear and the second eccentric gear are meshed with the driving gear at the same time.

10. The grinding device according to any one of claims 1 to 5, characterized in that: The motion platform includes a first platform and a platform bottom plate, a universal ball is arranged between the first platform and the platform bottom plate, the grinding medium disk is arranged on the first platform, there are two groups of driving mechanisms, each group of driving mechanisms includes a power unit, an output unit and a slider assembly, the power unit provides driving force in the driving mechanism, the output unit connects the power unit and the slider assembly, the slider assembly includes a slider, a first slide rail and a second slide rail perpendicular to each other are arranged on the first platform, the first slide rail is parallel to the y-axis direction, the slider is slidably connected to the first slide rail and the second slide rail respectively, the driving mechanism pushes the first slide rail to make the first platform move along the x-axis direction relative to the platform bottom plate, and the driving mechanism pushes the second slide rail to make the first platform move along the y-axis direction relative to the platform bottom plate.

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