Grinding machine with electromagnetic induction drive and contactless transmission structure

Abstract

This invention relates to the field of grinding machine technology and discloses a grinding machine employing electromagnetic induction drive and a non-contact transmission structure. The machine includes a base, two sliding seats mounted on the base, a clamping mechanism and a drive assembly mounted on the sliding seats. The clamping mechanism includes a support base and a three-jaw chuck. An inner support member is provided on the support base. The drive assembly includes an induction motor for the main rotor mounted on the outer wall of the output shaft, and a linkage shaft connecting the grinding head and the auxiliary rotor mounted on the outer wall. The main rotor and the auxiliary rotor are driven by magnetic coupling. This grinding machine employing electromagnetic induction drive and a non-contact transmission structure effectively solves the problem in existing technologies where slender drive shafts undergo minute bending deformation during grinding. This minute deformation is significantly amplified under centrifugal force, leading to drive shaft chatter and ultimately causing ripples on the inner wall of the workpiece and dimensional deviations.

Description

Technical Field

[0001] This invention relates to the field of grinding machine technology, and specifically to a grinding machine that employs electromagnetic induction drive and a contactless transmission structure. Background Technology

[0002] Internal grinding machines are key equipment in the field of machining used to grind the inner cylindrical surface of workpieces. Their core function is to achieve high-precision forming of the inner wall of the workpiece and improve the surface quality through the rotation and feed motion of the grinding head.

[0003] In the existing working mode of internal grinding machines, the grinding of the inner circle of the workpiece is mostly achieved by direct drive. That is, the grinding head is directly connected to the induction motor through the transmission shaft. The torque output by the induction motor is transmitted to the grinding head through the transmission shaft, driving the grinding head to rotate at high speed. At the same time, the feed mechanism is used to achieve axial or radial movement to complete the grinding of the inner wall of the workpiece.

[0004] However, when grinding deep into the inner wall of a workpiece, the direct drive method has certain drawbacks. To meet the depth requirements of the workpiece, the drive shaft usually needs to be designed as a slender structure to ensure that the grinding head can reach into the inner cavity of the workpiece. However, during the grinding process, the slender drive shaft will undergo slight bending deformation under the action of radial grinding force. When rotating at high speed, this slight deformation will be significantly amplified under the action of centrifugal force, which will cause the drive shaft to chatter. The cutting force between the grinding head and the inner wall of the workpiece will fluctuate, eventually causing ripples and dimensional deviations on the inner wall of the workpiece. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a grinding machine employing electromagnetic induction drive and a non-contact transmission structure. This effectively solves the problems inherent in the direct drive method used in existing technologies when grinding deep into the inner wall of a workpiece. To accommodate the depth requirements of the workpiece, the drive shaft is typically designed as a slender structure to ensure that the grinding head can extend into the workpiece cavity. However, during the grinding process, the slender drive shaft undergoes slight bending deformation under the action of radial grinding force. At high speeds, this slight deformation is significantly amplified under the action of centrifugal force, leading to chattering of the drive shaft. This causes periodic fluctuations in the cutting force between the grinding head and the inner wall of the workpiece, ultimately resulting in ripples and dimensional deviations on the inner wall of the workpiece.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a grinding machine employing electromagnetic induction drive and a contactless transmission structure, comprising:

[0008] The base has a guide rail on which a ball screw is installed. Two sliding seats are slidably arranged on the outer wall of the ball screw in the front-back direction.

[0009] A clamping mechanism is provided on the rear sliding seat and is used to limit the workpiece. The clamping mechanism includes a support seat and a three-jaw chuck provided on the rear sliding seat. An inner support member is provided on the support seat and is coaxially arranged with the three-jaw chuck.

[0010] A drive assembly is provided on the front sliding seat. The drive assembly includes an induction motor provided on the front sliding seat. The output shaft of the induction motor is arranged rearward, and a main rotor is provided on the outer wall of the output shaft.

[0011] The linkage shaft, which is connected to the inner support component by a quick disassembly and assembly method, has a grinding head and an auxiliary rotor respectively installed on its outer wall.

[0012] The base is equipped with an electromagnetic sensor, which starts working when the main rotor moves to the position of the electromagnetic sensor, and the main rotor and the auxiliary rotor are driven by magnetic coupling.

[0013] Furthermore, the three-jaw chuck drives the large bevel gear inside to rotate, thereby enabling the three small bevel gears and the corresponding jaws to move closer together synchronously.

[0014] Furthermore, the inner support includes a linkage disc mounted on the support base and rotating with the large bevel gear. A threaded groove is provided at the center of the linkage disc, and a threaded rod is provided inside the threaded groove. A push block is provided at the front end of the threaded rod. In the initial state, the push block is located on the side close to the three-jaw chuck.

[0015] Furthermore, the front side wall of the linkage plate is provided with a mounting bracket that is slidably connected to the three-jaw chuck. The outer wall of the mounting bracket is provided with several mounting slots along the circumferential direction, and the interior of each of the mounting slots is rotatably provided with a support plate that contacts the outer wall of the push block.

[0016] Furthermore, in the initial state, several support plates are tilted, that is, the front ends of several support plates are close to each other.

[0017] Furthermore, a clearance groove is provided on the side of the support plate near the outer wall of the mounting frame. An adjustment plate is slidably installed inside the clearance groove via a sliding block. The side of the adjustment plate near the push block is connected to the clearance groove via several compression springs. Several rotating rollers are provided on the side of the adjustment plate away from the push block in the front-back direction.

[0018] Furthermore, the front end of the push block is rotatably provided with an auxiliary shaft that is threadedly connected to the linkage shaft. The outer circumference of the auxiliary shaft is provided with an annular groove, and an adjusting ring is rotatably provided inside the annular groove. The outer wall of the adjusting ring is provided with a U-shaped seat corresponding to the position of several support plates. The U-shaped seat is rotatably connected to the support plate at the corresponding position through a hinge plate rotatably provided inside it.

[0019] Furthermore, the drive assembly also includes an auxiliary component for setting the outer wall of the induction motor output shaft. The auxiliary component includes a base shell connected to the induction motor output shaft and whose outer wall is connected to a retaining plate by several tension springs. A centrifugal clutch is provided inside the base shell.

[0020] Furthermore, several sliding grooves are formed on the outer walls of several abutments of the centrifugal clutch component along the circumferential direction. Each sliding groove is connected to a rectangular seat by a return spring, and a ball bearing is rotatably arranged inside the rectangular seat.

[0021] Furthermore, the two sliding seats on the front and middle sides are threadedly connected to the ball screw, the rear sliding seat is slidably connected to the ball screw, and an electromagnet is provided on the side near the middle sliding seat.

[0022] The technical solution provided by this invention has the following advantages compared with the prior art:

[0023] This invention utilizes a non-contact transmission method, eliminating the need for a slender drive shaft to penetrate deep into the workpiece's inner wall. The main rotor drives the auxiliary rotor inside the workpiece and the grinding head to rotate through a magnetic field, with no physical contact between the two. This eliminates the risk of chatter caused by bending and deformation of the drive shaft. As the grinding head gradually penetrates deeper into the workpiece, the workpiece, which is easily ground, is susceptible to shaking due to the lack of support caused by gravity or vibration. Therefore, the drive assembly also includes an auxiliary component installed on the outer wall of the induction motor's output shaft. This auxiliary component provides support for the inner wall of the workpiece after grinding, preventing vibration and thus ensuring grinding quality. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the clamping mechanism according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the planar structure of the clamping mechanism according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the three-dimensional separation of the clamping mechanism and the sliding seat in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the three-dimensional separation of the pushing block and the linkage disk in an embodiment of the present invention;

[0030] Figure 6 This is a three-dimensional structural diagram of the mounting frame, support plate, and adjustment plate separated according to an embodiment of the present invention;

[0031] Figure 7 This is a three-dimensional structural diagram of the drive group according to an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the three-dimensional separation of the main rotor and auxiliary components according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the three-dimensional separation of the rectangular seat, ball bearings, and centrifugal clutch component in an embodiment of the present invention.

[0034] The labels in the diagram represent: 1. Base; 11. Guide rail; 12. Ball screw; 13. Sliding seat; 2. Clamping mechanism; 21. Support seat; 22. Three-jaw chuck; 23. Inner support component; 231. Linkage plate; 232. Threaded rod; 233. Push block; 2331. Auxiliary shaft; 2332. Annular groove; 2333. Adjusting ring; 2334. U-shaped seat; 2335. Hinge plate; 234. Mounting bracket; 2341. Mounting groove; 235. Support plate; 236. Adjusting plate; 237. Rotary roller; 3. Drive group; 31. Induction motor; 32. Main rotor; 33. Auxiliary component; 331. Base shell; 332. Pressing plate; 333. Centrifugal clutch component; 334. Sliding groove; 335. Rectangular seat; 336. Ball; 4. Linkage shaft; 41. Grinding head; 42. Secondary rotor. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] The present invention will be further described below with reference to embodiments.

[0037] Example:

[0038] Please see Figure 1 - Figure 9 The present invention provides a technical solution: a grinding machine employing electromagnetic induction drive and a contactless transmission structure, comprising:

[0039] The base 1 has a guide rail 11 on which a ball screw 12 is internally installed, and two sliding seats 13 are slidably arranged on the outer wall of the ball screw 12 in the front-back direction.

[0040] A clamping mechanism 2 is provided on the rear sliding seat 13 and is used to limit the workpiece. The clamping mechanism 2 includes a support seat 21 and a three-jaw chuck 22 provided on the rear sliding seat 13. An inner support member 23 is provided on the support seat 21 and is coaxially arranged with the three-jaw chuck 22.

[0041] A drive group 3 is provided on the front sliding seat 13. The drive group 3 includes an induction motor 31 provided on the front sliding seat 13. The output shaft of the induction motor 31 is arranged facing rearward, and a main rotor 32 is provided on the outer wall of the output shaft.

[0042] The linkage shaft 4, which is connected to the inner support 23 by a quick disassembly and assembly method, has a grinding head 41 and a secondary rotor 42 respectively provided on its outer wall.

[0043] An electromagnetic sensor is installed on the base 1. The main rotor 32 starts working when it moves to the position of the electromagnetic sensor. The main rotor 32 and the auxiliary rotor 42 are driven by magnetic coupling.

[0044] The three-jaw chuck 22 drives the large bevel gear inside it to rotate, thereby enabling the three small bevel gears and the corresponding jaws to move closer together synchronously.

[0045] The inner support member 23 includes a linkage disc 231 mounted on the support base 21 and rotating with the large bevel gear. A threaded groove is provided at the center of the linkage disc 231, and a threaded rod 232 is provided inside the threaded groove. A push block 233 is provided at the front end of the threaded rod 232. In the initial state, the push block 233 is located on the side close to the three-jaw chuck 22.

[0046] The front side wall of the linkage plate 231 is provided with a mounting bracket 234 that is slidably connected to the three-jaw chuck 22. The outer wall of the mounting bracket 234 is provided with a number of mounting slots 2341 along the circumferential direction. The interior of each of the mounting slots 2341 is rotatably provided with a support plate 235 that contacts the outer wall of the push block 233.

[0047] In the initial state, several support plates 235 are tilted, that is, the front ends of several support plates 235 are close to each other.

[0048] A clearance groove is provided on the side of the support plate 235 near the outer wall of the mounting bracket 234. An adjustment plate 236 is slidably arranged inside the clearance groove via a sliding block. The side of the adjustment plate 236 near the push block 233 is connected to the clearance groove via several compression springs. Several rotating rollers 237 are rotatably arranged on the side of the adjustment plate 236 away from the push block 233 in the front-back direction.

[0049] The front end of the push block 233 is rotatably provided with an auxiliary shaft 2331 that is threadedly connected to the linkage shaft 4. The outer circumferential wall of the auxiliary shaft 2331 is provided with an annular groove 2332. An adjusting ring 2333 is rotatably provided inside the annular groove 2332. The outer wall of the adjusting ring 2333 is provided with a U-shaped seat 2334 corresponding to the positions of several support plates 235. The U-shaped seat 2334 is rotatably connected to the support plate 235 at the corresponding position through a hinge plate 2335 rotatably provided inside it.

[0050] The drive assembly 3 also includes an auxiliary component 33 that sets the outer wall of the output shaft of the induction motor 31. The auxiliary component 33 includes a base shell 331 that is connected to the output shaft of the induction motor 31 and whose outer wall is connected to a clamping plate 332 by several tension springs. A centrifugal clutch 333 is provided inside the base shell 331.

[0051] The outer walls of several abutments of the centrifugal clutch 333 are provided with several sliding grooves 334 along the circumferential direction. The interior of each sliding groove 334 is connected to a rectangular seat 335 by a return spring. The interior of the rectangular seat 335 is provided with a ball bearing 336.

[0052] The two sliding seats 13 on the front and middle sides are threadedly connected to the ball screw 12, the rear sliding seat 13 is slidably connected to the ball screw 12, and an electromagnet is provided on the side near the middle sliding seat 13.

[0053] In practice, the workpiece installation process includes:

[0054] During the machining process, in order to ensure that the workpiece maintains a stable position when subjected to external forces such as grinding, and to avoid affecting the machining accuracy due to displacement or shaking, it is usually necessary to limit and clamp the workpiece before machining. Currently, the most common clamping method is to use a chuck (multiple jaws on the chuck move synchronously towards the center under the drive of the drive mechanism, and form radial clamping and limiting of the workpiece through close contact with the outer surface of the workpiece), thereby firmly fixing the workpiece in the machining position and providing a basic guarantee for subsequent machining processes such as grinding.

[0055] However, when dealing with thin workpieces, this method of clamping solely on the outer wall has significant drawbacks. Although the synchronous approach of the jaws can achieve clamping of the workpiece and provide a certain degree of stability from the outside, the lack of corresponding internal support structures causes the outer wall of the workpiece to undergo inward plastic or elastic deformation due to concentrated force during the clamping process. This deformation not only alters the original shape of the workpiece, leading to dimensional deviations before processing, but also affects the precision control of subsequent processing steps such as grinding, making it difficult for the processed workpiece to meet the design requirements for size and shape accuracy. Based on this, the grinding machine using electromagnetic induction drive and non-contact transmission structure is equipped with an inner support member 23 that works synchronously with the three-jaw chuck 22. During the workpiece clamping process, by controlling the movement of the jaws on the three-jaw chuck 22, the inner support member 23 can be driven synchronously, thereby achieving clamping and limiting of the inner and outer walls of the workpiece before grinding, avoiding the workpiece deformation problem caused by unilateral clamping.

[0056] Specifically, firstly, the workpiece to be processed is placed on the mounting frame 234 (the mounting frame 234 is used to support the support plate 235, so it has a certain length; when the workpiece is placed on the mounting frame 234, the upward support force of the mounting frame 234 prevents the workpiece from falling). Then, the three jaws on the three-jaw chuck 22 are controlled to move closer synchronously, gradually achieving simultaneous clamping and limiting of the workpiece's outer wall. During the synchronous movement of the three jaws, the large bevel gear drives the linkage disc 231 to rotate synchronously (the large bevel gear of the three-jaw chuck 22 is divided into a meshing section and a mating section; the mating section has several mating grooves along the circumference; the outer wall of the linkage disc 231 has mating blocks corresponding to the mating grooves; initially, the mating blocks are located inside the corresponding mating grooves. Thus, when the large bevel gear rotates, it can synchronously drive the mating blocks and the linkage disc 231 to rotate synchronously through the mating grooves). During the rotation of the linkage disc 231, because its center is threadedly connected to a threaded rod 232, therefore... The threaded rod 232 moves forward gradually under the drive of the threaded groove. During this process, the push block 233 connected to the threaded rod 232 also moves synchronously and gradually completes the internal support work for the inner wall of the workpiece. (Specifically, the mounting bracket 234 has several mounting grooves 2341 along the circumferential direction. Each mounting groove 2341 has a support plate 235 rotatably installed inside it. Initially, the support plates 235 are inclined, while the push block 233 is cone-shaped, that is, the diameter of the push block 233 is conical from front to back.) As the pusher block 233 gradually increases in size, it pushes against several support plates 235 through its outer wall as it moves with the threaded rod 232. This causes the support plates 235 to gradually adjust from an initial inclined state to a horizontal state. After the support plates 235 are pushed to a horizontal state, they cannot continue to rotate outward due to the installation groove 2341. The adjusting plate 236 is subjected to a reaction force from the inner surface of the workpiece, thereby compressing the compression spring. Finally, the adjusting plate 236 provides support for the inner surface of the workpiece.

[0057] It should be noted that the clamping mechanism 2 can increase or decrease the clamping area of ​​the inner support 23 according to the workpiece of different sizes, thereby realizing the diversity of workpiece grinding work. Specifically, when clamping short and thick workpieces to be processed, due to their short length and large mass, vibration or jumping problems are not likely to occur during subsequent grinding. The three jaws do not need to move a long distance to clamp the outer wall of the workpiece. Similarly, after the push block 233 moves a small distance, it pushes the support plate 235 and finally completes the inner and outer limiting work of the short and thick workpiece.

[0058] When performing the limiting operation on a long workpiece, due to its length, the end furthest from the clamping mechanism 2 is susceptible to vibration from gravity or grinding force during grinding. Consequently, the three jaws need to move a considerable distance when facing such a workpiece. The push block 233, driven by the threaded rod 232, moves further, supporting the front end of the support plate 235. This changes the initial inclined position of the support plate 235 to a horizontal position. (The support plate 235 is not only pushed by the push block 233, but also pushed by the hinge plate 2335.) Specifically, the outer wall of the auxiliary shaft 2331 is provided with an annular groove 2332, and the adjusting ring 2333 is rotatably set inside the annular groove 2332. When the push block 233 drives the auxiliary shaft 2331 to move synchronously, since the length of the hinge plate 2335 is fixed, the hinge plate 2335 at the corresponding position will assist the push block 233 in lifting the support plate 235 to a horizontal state. By increasing the inner support area, not only can the stability of the workpiece clamping operation be ensured, but also the inner surface of the workpiece is subjected to outward force by several rotating rollers 237, avoiding the workpiece deformation problem caused by relying solely on the outer wall for clamping.

[0059] Grinding of the inner surface of the workpiece:

[0060] In existing internal grinding machines, the grinding of the inner circle of a workpiece is mostly achieved by direct drive. However, when grinding deep into the inner wall of the workpiece, the direct drive method has certain drawbacks. To meet the depth requirements of the workpiece, the drive shaft usually needs to be designed as a slender structure to ensure that the grinding head 41 can reach into the inner cavity of the workpiece. However, during the grinding process, the slender drive shaft will undergo slight bending deformation under the action of radial grinding force. When rotating at high speed, this slight deformation will be significantly amplified under the action of centrifugal force, which will cause the drive shaft to chatter. The cutting force between the grinding head 41 and the inner wall of the workpiece will fluctuate, eventually causing ripples and dimensional deviations on the inner wall of the workpiece. Based on this, the grinding machine that adopts electromagnetic induction drive and non-contact transmission structure eliminates the need for a slender drive shaft through non-contact transmission. The main rotor 32 drives the auxiliary rotor 42 inside the workpiece and the grinding head 41 to rotate through the action of magnetic field. The two have no physical contact, eliminating the chatter risk caused by the bending deformation of the drive shaft.

[0061] Specifically, when grinding the inner surface of a workpiece, the grinding head 41 and the auxiliary rotor 42, which are matched in size, are first connected to the auxiliary shaft 2331 via the linkage shaft 4. Then, the ball screw 12 is controlled to rotate (any end of the ball screw 12 is connected to the external drive unit). When the ball screw 12 rotates, the two sliding seats 13 located in the middle and front end move synchronously along the guide rail 11. When the main rotor 32 and the auxiliary rotor 42 are magnetically matched, the induction motor 31 starts. At the same time, the middle sliding seat 13 and the rear sliding seat 13 also come into close contact. Then, the electromagnet power supply is turned on, so that the middle sliding seat 13 and the rear sliding seat 13 are connected as a whole. During the rotation of the main rotor 32, the auxiliary rotor 42 also rotates under the drive of the magnetic force. With the movement of the three sliding seats 13, the grinding work on the inner circle of the workpiece is realized.

[0062] As the three sliding seats 13 move, several support plates 235 gradually slide along the inner wall of the workpiece under the drive of the mounting frame 234 (several rotating rollers 237 are provided on the outer wall of the adjusting plate 236; when the support plate 235 moves, several rotating rollers 237 rotate to reduce the friction between it and the inner wall of the workpiece). Since the mounting frame 234 is slidably connected to the three-jaw chuck 22 (several through slots are provided on the three-jaw chuck 22 along the circumferential direction, and the mounting frame 234 has corresponding slots that always slide inside them), The guide block (when the mounting bracket 234 moves, it will only move horizontally and will not rotate due to the guide block) As the grinding head 41 gradually penetrates into the workpiece, the workpiece that has been ground is easily affected by gravity or vibration due to lack of support, and thus shakes. Based on this, the drive group 3 also includes an auxiliary component 33 set on the outer wall of the output shaft of the induction motor 31. The auxiliary component 33 can support the inner wall of the workpiece after grinding, so as to avoid vibration and thus affect the grinding quality.

[0063] Specifically, the outer wall of the base shell 331 is equipped with a retaining plate 332 (the retaining plate 332 is ring-shaped and has a chamfer on its inner wall) via several tension springs. Inside the base shell 331, a centrifugal clutch 333 is installed. Initially, the retaining plate 332 is located directly above the sliding groove 334. When the centrifugal clutch 333 rotates with the output shaft, several claws expand outward synchronously under centrifugal force. The retaining plate 332 is located directly above the claws. Therefore, initially, the claws are held in place by the retaining plate 332. The obstruction of 2 prevents the sliding groove 334 from protruding. As the front sliding seat 13 continues to move, the clamping plate 332 contacts the front end of the workpiece. Since the workpiece is clamped and limited, the clamping plate 332 cannot continue to move and can only squeeze the tension spring and slide along the base shell 331. The centrifugal clutch 333, since its diameter is smaller than the inner diameter of the workpiece, can enter the interior of the workpiece without obstruction. When the centrifugal clutch 333 enters the interior of the workpiece, the unobstructed claw pops out and supports the inner wall of the workpiece through several balls 336.

[0064] It should be noted that the purpose of the chamfer on the inner wall of the clamping plate 332 is to improve the smoothness of the transition between the balls 336 and the abutments, and to avoid the problem of a large height difference between the inner wall of the clamping plate 332 and the inner wall of the workpiece, which could cause the balls 336 to damage the inner wall of the workpiece. At the same time, the outer wall of the abutments is provided with several sliding grooves 334 along the circumferential direction. Each of the sliding grooves 334 is connected to a rectangular seat 335 through a return spring. The purpose of this is that as the speed of the induction motor 31 increases, the probability of workpiece vibration also increases. Under the action of centrifugal force, the abutments further expand outward. At this time, by compressing the return spring, the balls 336 can better clamp the inner wall of the workpiece, thereby improving the stability of the entire grinding operation.

[0065] The front end of the push block 233 is rotatably equipped with an auxiliary shaft 2331 with an annular groove 2332 on its outer wall. An adjusting ring 2333 is rotatably mounted inside the annular groove 2332. The U-shaped seat 2334 on the adjusting ring 2333 and the hinge plate 2335 limit the movement of the auxiliary shaft 2331, ensuring its stability during subsequent grinding. Both ends of the hinge plate 2335 are rotatably connected to the U-shaped seat 2334 and the support plate 235, respectively. When the push block 233 moves only a small distance, the hinge plate 2335 remains tilted. During grinding, the support plate 235 effectively prevents the auxiliary shaft 2331 from radially jumping (because the push block 233 moves only a small distance, the support plate 235...). Still in an inclined state, and with the rotation point of the support plate 235 far from the position of the hinge plate 2335, the restriction of the inclined support plate 235 is sufficient to eliminate the slight radial jump of the auxiliary shaft 2331 during the grinding process. When the support plate 235 is pushed to a horizontal state, several hinge plates 2335 are in a state perpendicular to the support plate 235. At this time, when the auxiliary shaft 2331 jumps radially, the support plate 235 cannot continue to rotate outward, thus achieving the restriction of the auxiliary shaft 2331, ensuring its stability during the rotation of the grinding head 41, and avoiding the vibration of the auxiliary shaft 2331 and the grinding head 41 during the grinding process, which could lead to ripples on the inner wall of the workpiece and dimensional deviations.

[0066] It is worth emphasizing that this grinding machine, which adopts electromagnetic induction drive and non-contact transmission structure, has the following main advantages:

[0067] Firstly, this grinding machine uses a non-contact transmission method, eliminating the need for a slender drive shaft to penetrate deep into the workpiece's inner wall. The main rotor 32 drives the auxiliary rotor 42 inside the workpiece and the grinding head 41 to rotate through the action of a magnetic field. Since there is no physical contact between the two, the risk of chatter caused by the bending and deformation of the drive shaft is eliminated. As the grinding head 41 gradually penetrates into the workpiece, the finished workpiece is susceptible to shaking due to the lack of support caused by gravity or vibration. Based on this, the drive group 3 also includes an auxiliary component 33 set on the outer wall of the output shaft of the induction motor 31. The auxiliary component 33 can support the inner wall of the workpiece after grinding, preventing it from vibrating and thus affecting the grinding quality.

[0068] Secondly, the clamping plate 332 is ring-shaped with a chamfer on its inner wall. This is to improve the smoothness of the transition between the balls 336 and the abutment, and to avoid a large height difference between the inner wall of the clamping plate 332 and the inner wall of the workpiece, which could cause the balls 336 to damage the inner wall of the workpiece. At the same time, the outer wall of the abutment has several sliding grooves 334 along the circumferential direction. Each of the sliding grooves 334 is connected to a rectangular seat 335 through a return spring. The purpose of this is that as the speed of the induction motor 31 increases, the probability of workpiece vibration also increases. Under the action of centrifugal force, the abutment further expands outward. At this time, by compressing the return spring, the balls 336 can better clamp the inner wall of the workpiece, thereby improving the stability of the entire grinding operation.

[0069] Thirdly, the front end of the push block 233 is rotatably equipped with an auxiliary shaft 2331 with an annular groove 2332 on its outer wall. An adjusting ring 2333 is rotatably mounted inside this annular groove 2332. Through the U-shaped seat 2334 and the hinge plate 2335 on the adjusting ring 2333, the auxiliary shaft 2331 can be limited, ensuring its stability during subsequent grinding. The two ends of the hinge plate 2335 are rotatably connected to the U-shaped seat 2334 and the support plate 2335, respectively. When the push block 233 moves only a small distance, the hinge plate 2335 remains tilted. During grinding, the support plate 235 effectively prevents the auxiliary shaft 2331 from radially jumping (because the push block 233 moves only a small distance, the support plate 2335...). 35 is still in an inclined state, and the rotation point of the support plate 235 is far from the position of the hinge plate 2335. Therefore, the restriction of the inclined support plate 235 is sufficient to eliminate the small radial jump of the auxiliary shaft 2331 during the grinding operation. When the support plate 235 is pushed to a horizontal state, several hinge plates 2335 are in a state perpendicular to the support plate 235. At this time, when the auxiliary shaft 2331 jumps in the radial direction, the support plate 235 cannot continue to rotate outward, thereby achieving the restriction of the auxiliary shaft 2331, ensuring its stability during the rotation of the grinding head 41, and avoiding the vibration of the auxiliary shaft 2331 and the grinding head 41 during the grinding process, which would cause ripples on the inner wall of the workpiece and dimensional deviations.

[0070] Fourthly, when the linkage disc 231 rotates, because its center is threadedly connected to a threaded rod 232, the threaded rod 232 gradually moves forward under the drive of the threaded groove. During this process, the push block 233 connected to the threaded rod 232 also moves synchronously, gradually completing the internal support work on the inner wall of the workpiece. The mounting bracket 234 has several mounting slots 2341 opened along the circumferential direction. Each of the mounting slots 2341 has a support plate 235 rotatably installed inside. Initially, the support plates 235 are inclined, while the push block 233 is set in a conical shape. The shape, that is, the diameter of the push block 233 gradually increases from front to back. As the push block 233 moves with the threaded rod 232, it gradually pushes against several support plates 235 through its outer wall, thereby gradually adjusting the support plates 235 from the initial inclined state to the horizontal state. After the support plates 235 are pushed to the horizontal state, they cannot continue to rotate outward due to the setting of the mounting groove 2341. The adjusting plate 236 is subjected to the reaction force from the inner surface of the workpiece, thereby squeezing the compression spring. Finally, the adjusting plate 236 achieves the support work for the inner surface of the workpiece.

[0071] Fifthly, when clamping short and thick workpieces, due to their short length and large mass, vibration or jumping is less likely to occur during subsequent grinding. The three jaws do not need to move a long distance to clamp the outer wall of the workpiece. Similarly, after the push block 233 moves a small distance, it pushes against the support plate 235, ultimately completing the internal and external limiting work of the short and thick workpiece. When limiting longer workpieces, the three jaws need to move a longer distance, while the push block 233... Driven by the threaded rod 232, it moves further and supports the front end of the support plate 235, changing the entire support plate 235 from its initial inclined state to a horizontal state. The support plate 235 is not only pushed by the push block 233, but also lifted by the hinge plate 2335. By increasing the inner support area, the stability of the workpiece clamping operation can be ensured. Several rotating rollers 237 apply outward force to the inner surface of the workpiece, avoiding the workpiece deformation problem caused by relying solely on the outer wall for clamping.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grinding machine using electromagnetic induction drive and non-contact transmission structure, characterized by, The utility model relates to a workpiece polishing device, including: Base (1) is provided with guide rail (11) of internal installation ball screw (12) on, the outer wall of ball screw (12) is provided with three sliding seats (13) along the front and back direction slidingly, Clamping mechanism (2) for realizing workpiece limiting work is arranged on the rear sliding seat (13), clamping mechanism (2) includes support seat (21) and three jaw chuck (22) arranged on the rear sliding seat (13), support seat (21) is provided with inner support (23) coaxially arranged with three jaw chuck (22), Drive group (3) is arranged on the front sliding seat (13), drive group (3) includes induction motor (31) arranged on the front sliding seat (13), the output shaft of induction motor (31) is arranged towards back, and main rotor (32) is arranged on the outer wall of output shaft, Linkage shaft (4) is connected with inner support (23) by quick dismounting mode, the outer wall of linkage shaft (4) is respectively provided with polishing head (41) and auxiliary rotor (42), Wherein, main rotor (32) and auxiliary rotor (42) are driven by magnetic coupling, Wherein, the inner support (23) includes linkage disc (231) arranged on the support seat (21) and rotating with the bevel gear, the center of linkage disc (231) is provided with a threaded groove, and a threaded rod (232) is arranged in the threaded groove, the front end of the threaded rod (232) is provided with a push block (233), in the initial state, the push block (233) is located on the side close to the three jaw chuck (22), the front wall of the linkage disc (231) is provided with a mounting frame (234) slidably connected with the three jaw chuck (22), the outer wall of the mounting frame (234) is provided with a plurality of installation grooves (2341) along the circumferential direction, a plurality of the installation grooves (2341) are rotatably provided with a plurality of support plates (235) in contact with the outer wall of the push block (233), the side close to the outer wall of the mounting frame (234) of the support plate (235) is provided with an avoiding groove, the avoiding groove is slidably provided with an adjusting plate (236) through a sliding block, the side close to the push block (233) of the adjusting plate (236) is connected with the avoiding groove through a plurality of compression springs, the side away from the push block (233) of the adjusting plate (236) is rotatably provided with a plurality of rotating rollers (237) along the front and back direction.

2. The grinding machine with electromagnetic induction driving and non-contact transmission structure according to claim 1, characterized in that: The three jaw chuck (22) is driven to rotate by the large bevel gear in the three jaw chuck (22), so as to realize the synchronous approach of the three small bevel gears and the corresponding claws.

3. The grinding machine with electromagnetic induction driving and non-contact transmission structure according to claim 1, characterized in that: In the initial state, a plurality of the support plates (235) are inclined, i.e. the front ends of a plurality of the support plates (235) are close to each other.

4. The grinding machine with electromagnetic induction driving and non-contact transmission structure according to claim 1, characterized in that: The front end of the pushing block (233) is rotationally provided with an auxiliary shaft (2331) which is threadedly connected with the linkage shaft (4), the circumferential outer wall of the auxiliary shaft (2331) is provided with an annular groove (2332), the annular groove (2332) is rotationally provided with an adjusting ring (2333), the outer wall of the adjusting ring (2333) is provided with a U-shaped seat (2334) at positions corresponding to the support plates (235), and the U-shaped seat (2334) is rotationally connected with the support plates (235) at the corresponding positions through a hinged plate (2335) rotationally arranged in the U-shaped seat (2334).

5. The grinding machine with electromagnetic induction driving and non-contact transmission structure according to claim 1, characterized in that: The driving group (3) further comprises an auxiliary member (33) arranged on the outer wall of the output shaft of the induction motor (31), the auxiliary member (33) comprises a base shell (331) connected with the output shaft of the induction motor (31) and having abutting plates (332) connected with the outer wall through a plurality of tension springs, and the base shell (331) is internally provided with a centrifugal clutch member (333).

6. The grinding machine with electromagnetic induction driving and non-contact transmission structure according to claim 5, characterized in that: The outer wall of each of the pawls of the centrifugal clutch member (333) is provided with a plurality of sliding grooves (334) in the circumferential direction, and the inner part of each of the sliding grooves (334) is connected with a rectangular seat (335) through a return spring.

7. The grinding machine with electromagnetic induction driving and non-contact transmission structure according to claim 1, characterized in that: The front and middle sliding seats (13) are threadedly connected with the ball screw (12), the rear sliding seat (13) is slidingly connected with the ball screw (12), and the side close to the middle sliding seat (13) is provided with an electromagnet.

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