Numerical control rotary table with diaphragm spring type electromagnetic brake

Abstract

The invention relates to a numerical control rotary table with a diaphragm spring type electromagnetic brake, which comprises a torque motor mechanism, a diaphragm spring type electromagnetic brake mechanism and a rotary table mechanism, and is characterized in that the diaphragm spring type electromagnetic brake mechanism comprises a fixed base, an electromagnet, a friction plate assembly, an armature and an integral diaphragm spring assembly; the friction plate assembly comprises a plurality of dynamic friction plates and a plurality of static friction plates, the dynamic friction plates synchronously rotate along with the rotor assembly, and the static friction plates are connected with the fixed base; the movable friction plates and the static friction plates are arranged alternately, an armature is movably arranged between the friction plate assembly and the electromagnet, an integral diaphragm spring assembly is arranged between the fixed base and the armature, and the surfaces of the two ends of the integral diaphragm spring assembly are fixedly connected with the armature and the fixed base respectively. By arranging the integral diaphragm spring assembly and utilizing the characteristic that the integral diaphragm spring assembly is rigid in the circumferential direction, the armature and the rotating table mechanism are effectively prevented from deviating in the circumferential direction, accurate positioning of a workpiece is guaranteed, and the structure is simplified.

Description

Technical Field

[0001] The invention relates to the field of numerically controlled machine tools, in particular to a numerically controlled rotary table with a diaphragm spring type electromagnetic brake. Background Art

[0002] The CNC rotary table is a core component of CNC machine tools such as CNC lathes, CNC milling machines, CNC grinders, and machining centers. In order to improve the accuracy, the existing CNC rotary tables generally use a torque motor drive mechanism to drive the CNC rotary table to rotate. When a stop command is received, the motor is braked by a dynamic braking circuit. However, the self-locking force of this braking method is relatively small. During the stop phase, due to the processing pressure of the tool on the workpiece, it is easy to produce slow slippage, and the precise positioning requirements during workpiece processing cannot be guaranteed; and this braking method cannot achieve emergency braking of the CNC rotary table in an emergency situation of sudden power failure, so that the CNC rotary table is at risk of collision, causing serious losses; therefore, it is often necessary to set a set of braking mechanisms in the CNC rotary table to brake the CNC rotary table to ensure precise positioning requirements and ensure emergency braking in the event of a power failure.

[0003] At present, the common brake mechanism on CNC rotary tables is the hydraulic brake mechanism, such as Chinese invention applications CN107331234A, CN115008214A, etc., which all use hydraulic brake mechanisms; when the hydraulic brake mechanism is braking, the hydraulic component needs to obtain hydraulic power from the external control tank to drive the dynamic friction ring to move axially so that it is pressed against the rotating component for braking. When unloading, the hydraulic component obtains hydraulic power from the external control tank to drive the dynamic friction ring to move in the reverse direction, loosen the pressure on the rotating component, and release the brake. It can be seen that the hydraulic brake mechanism needs to increase or reduce pressure during braking, that is, the braking requires a certain reaction time. Therefore, it is difficult for the hydraulic brake mechanism to provide braking torque instantly in an emergency situation of sudden power failure, and the emergency braking effect is not good.

[0004] Since the electromagnetic attraction of the spring-type electromagnetic brake disappears immediately when a sudden power failure occurs, the armature and the brake pad can instantly fit with the brake disc under the action of the spring to provide braking torque, which has the advantage of fast response and is gradually being applied to CNC rotary tables. However, the existing spring-type electromagnetic brake mechanism generally adopts a coil spring, which is easy to twist in the circumferential direction. Therefore, it is necessary to set a guide shaft in the coil spring-type electromagnetic brake mechanism to ensure the movement direction of the armature and prevent the armature from deflecting in the circumferential direction. For example, in Chinese utility model patent CN214036598U, a bolt is set to guide the movement of the armature. However, since there is a certain matching clearance between the guide shaft and the armature, and there will be wear between the guide shaft and the armature after long-term use, the clearance between the armature and the guide shaft will also increase. Therefore, the armature will have a small amount of circumferential deviation, especially under the processing pressure of the tool, it is more likely to deviate, which will cause the CNC rotary table to deviate accordingly, and the precise positioning requirement during workpiece processing cannot be guaranteed.

[0005] Moreover, the existing brake mechanism and drive mechanism are separately arranged, which takes up more space, thereby increasing the overall volume of the CNC machine tool.

[0006] Therefore, it is urgent to provide a technical solution to solve the above-mentioned technical problems. Summary of the invention

[0007] In order to overcome the defects and shortcomings in the prior art, the purpose of the present invention is to design a CNC rotary table with a diaphragm spring electromagnetic brake, which relies on the diaphragm spring itself to have rigidity in the circumferential direction and cannot be twisted in the circumferential direction to prevent the armature from circumferential displacement, thereby meeting the requirement of providing braking torque instantly, ensuring the requirement of precise positioning during workpiece processing, and can effectively reduce the size of the CNC machine tool.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A numerically controlled rotary table with a diaphragm spring electromagnetic brake comprises a torque motor mechanism, a diaphragm spring electromagnetic brake mechanism and a rotary table mechanism, wherein the torque motor mechanism comprises a stator assembly and a mover assembly;

[0010] The rotating table mechanism comprises a rotating table, which is arranged at one end of the torque motor mechanism and is fixedly connected to the mover assembly;

[0011] The diaphragm spring type electromagnetic brake mechanism includes a fixed base, which is arranged at the other end of the torque motor mechanism and fixedly connected to the stator assembly, an electromagnet is fixed on the fixed base, a friction plate assembly is arranged on the side of the electromagnet away from the fixed base, the friction plate assembly includes a plurality of dynamic friction plates and a plurality of static friction plates, the plurality of dynamic friction plates rotate synchronously with the mover assembly, and the plurality of static friction plates are connected to the fixed base; the plurality of dynamic friction plates and the plurality of static friction plates are arranged alternately, an armature is movably arranged between the friction plate assembly and the electromagnet, the end of the armature away from the electromagnet can squeeze the dynamic friction plate and the static friction plate and change the spacing between the dynamic friction plate and the static friction plate, an integral diaphragm spring assembly is arranged between the fixed base and the armature, and the two end surfaces of the integral diaphragm spring assembly are respectively fixedly connected to the armature and the fixed base.

[0012] More specifically, permanent magnets are provided on both the dynamic friction plate and the static friction plate, and the adjacent dynamic friction plates repel each other, and the repulsive force is much smaller than the elastic pressure exerted by the integral diaphragm spring assembly on the armature.

[0013] More specifically, the friction plate assembly also includes a first sleeve and a second sleeve, the first sleeve is arranged inside the movable subassembly and fixedly connected to the movable subassembly, the plurality of dynamic friction plates are arranged in the first sleeve and rotate synchronously with the first sleeve, the second sleeve is arranged inside the first sleeve and fixedly connected to the fixed base, and the plurality of static friction plates are sleeved on the outside of the second sleeve.

[0014] More specifically, a plurality of first plug-in grooves are arranged on the wall of the first sleeve, and a plurality of first plug-in blocks are arranged on the outer peripheral side of the dynamic friction plate protruding outward, and the first plug-in blocks are inserted in the first plug-in grooves.

[0015] More specifically, a plurality of second plug-in grooves are arranged on the wall of the second sleeve, a plurality of second plug-in blocks are arranged on the inner circumference of the static friction plate protruding inwardly, and the second plug-in blocks are inserted in the second plug-in grooves.

[0016] More specifically, the friction plate assembly further comprises a spacing adjustment pressure block, which is arranged on a side of the dynamic friction plate and the static friction plate away from the armature, and the spacing adjustment pressure block is threadedly connected to the second sleeve.

[0017] More specifically, the integral diaphragm spring assembly includes two diaphragm springs, each of which includes a large end face and a small end face, the large end faces of the two diaphragm springs are arranged opposite to each other and the outer peripheries of the two large end faces are fixedly connected; the two small end faces are respectively fixedly connected to the armature and the fixed base.

[0018] More specifically, the stator assembly includes a stator fixing sleeve and a stator arranged inside the stator fixing sleeve, the mover assembly is rotatably arranged inside the stator, the mover assembly includes a mover fixing sleeve and a mover arranged on the outer peripheral side of the mover fixing sleeve, the rotating table is fixedly connected to the mover fixing sleeve, the fixed base is fixedly connected to the stator fixing sleeve, and a first bearing is arranged between the mover fixing sleeve and the stator fixing sleeve.

[0019] More specifically, the rotating table mechanism also includes a center sleeve and an encoder, the encoder includes a scale disk and a reading head, a through hole is provided in the middle of the fixed base, one end of the center sleeve is fixed to the inner end surface of the rotating table, the other end of the center sleeve extends into the through hole, and the scale disk is provided at the other end, and the reading head is opposite to the scale disk and is provided on the fixed base.

[0020] More specifically, it also includes an oil circuit distributor, which is arranged at one end of the fixed base away from the torque motor mechanism, and the central axis of the oil circuit distributor extends to the interior of the central sleeve.

[0021] Beneficial effects of the present invention:

[0022] (1) An integral diaphragm spring assembly is provided in the electromagnetic brake mechanism to replace the spiral spring in the prior art. Since the integral diaphragm spring assembly is rigid in the circumferential direction, it can only perform extension and compression movements in the longitudinal direction, and cannot perform torsional movements in the circumferential direction. Therefore, by respectively fixing the two end surfaces of the integral diaphragm spring assembly to the armature and the fixed base, the integral diaphragm spring assembly, the armature and the fixed base are fixedly connected to form a whole. Thus, by virtue of the rigidity of the integral diaphragm spring assembly in the circumferential direction, the armature is restricted from rotating and deflecting in the circumferential direction, ensuring that the armature can only move in the longitudinal direction. On the one hand, there is no need to provide a guide shaft in the electromagnetic brake mechanism, which simplifies the structure and avoids wear between the armature and the guide shaft. On the other hand, the armature and the rotary table mechanism are effectively prevented from deflecting in the circumferential direction. Even under the processing pressure of the tool, the armature and the rotary table mechanism will not deflect, thereby ensuring the precise positioning requirements during workpiece processing.

[0023] (2) By integrating the diaphragm electromagnetic brake mechanism with the stator assembly and the mover assembly in the torque motor mechanism, space can be effectively saved and the volume of the CNC rotary table can be reduced;

[0024] (3) By arranging permanent magnets on both the dynamic friction plates and the static friction plates, adjacent dynamic friction plates and static friction plates repel each other. When the armature does not apply pressure to the dynamic friction plates and the static friction plates, a plurality of dynamic friction plates and a plurality of static friction plates are separated from each other due to the mutual repulsion force generated by the permanent magnets, thereby effectively eliminating the friction resistance between the dynamic friction plates and the static friction plates during the rotation of the mover assembly; and the mutual repulsion force between the adjacent dynamic friction plates and the static friction plates is greater than the gravity of the dynamic friction plates or the static friction plates themselves, so that when the central axis of the CNC rotary table is arranged in the vertical direction, the dynamic friction plates and the static friction plates can also overcome their own gravity and separate from each other. Therefore, the CNC rotary table can be arranged in both the horizontal direction and the vertical direction, and has a wide range of applications;

[0025] (4) According to the specific wear conditions of the dynamic friction plate and the static friction plate, the spacing adjustment block is regularly rotated to adjust its position on the outside of the second sleeve, thereby adjusting the spacing between the plurality of dynamic friction plates and the plurality of static friction plates, ensuring that when the integral diaphragm spring assembly is fully extended, the plurality of dynamic friction plates and the plurality of static friction plates can be compressed by the armature, thereby effectively extending the service life of the diaphragm spring electromagnetic brake mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic diagram of the overall structure of the numerically controlled rotary table with a diaphragm spring type electromagnetic brake according to the present invention.

[0027] Figure 2 The figure is a schematic cross-sectional view of the CNC rotary table with a diaphragm spring type electromagnetic brake according to the present invention.

[0028] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0029] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0030] Figure 5 It is a schematic cross-sectional view of the diaphragm spring type electromagnetic brake mechanism of the present invention.

[0031] Figure 6 It is a schematic diagram of the exploded structure of the friction plate assembly of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the first sleeve and the dynamic friction plate of the present invention.

[0033] Figure 8It is a schematic diagram of the structure of the second sleeve and the static friction plate of the present invention.

[0034] Fig. 9 It is a schematic diagram of the magnetic pole distribution of the dynamic friction plate and the static friction plate of the present invention.

[0035] Fig.10 It is a structural schematic diagram of the fixed base of the present invention.

[0036] Fig.11 It is a schematic diagram of the structure of the armature of the present invention.

[0037] Fig.12 It is a schematic structural diagram of the spacing adjustment pressing block of the present invention.

[0038] Fig.13 It is a schematic structural diagram of the integral diaphragm spring assembly of the present invention.

[0039] Fig.14 It is a structural schematic diagram of the torque motor mechanism and the rotating platform of the present invention.

[0040] Description of reference numerals:

[0041] 1- stator assembly; 11- stator fixing sleeve; 12- stator; 2- mover assembly; 21- mover fixing sleeve; 22- mover; 31- rotating table; 32- center sleeve; 33- scale plate; 34- reading head; 35- mounting bracket; 41- fixed base; 411- connecting seat body; 412- first fixing ring; 413- second fixing ring; 414- third fixing ring; 42- electromagnet; 43- armature; 431- first annular protrusion; 44- integral diaphragm Spring assembly; 441-diaphragm spring; 415-annular mounting groove; 45-through hole; 5-friction plate assembly; 51-first sleeve; 511-first plug-in slot; 52-second sleeve; 521-second plug-in slot; 53-dynamic friction plate; 531-first plug-in block; 54-static friction plate; 541-second plug-in block; 55-spacing adjustment block; 551-second annular protrusion; 6-first bearing; 7-oil distributor; 8-second bearing; 9-third bearing. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0043] like Figures 1 to 14 As shown, a CNC rotary table with a diaphragm spring electromagnetic brake provided by the present invention comprises a torque motor mechanism, a diaphragm spring electromagnetic brake mechanism and a rotary table mechanism, wherein the torque motor mechanism comprises a stator assembly 1 and a mover assembly 2;

[0044] The rotating table mechanism includes a rotating table 31, which is arranged at one end of the torque motor mechanism and fixedly connected to the mover assembly 2;

[0045] The diaphragm spring type electromagnetic brake mechanism includes a fixed base 41, which is arranged at the other end of the torque motor mechanism and fixedly connected to the stator assembly 1, and an electromagnet 42 is fixed on the fixed base 41, and a friction plate assembly 5 is arranged on the side of the electromagnet 42 away from the fixed base 41, and the friction plate assembly 5 includes a plurality of dynamic friction plates 53 and a plurality of static friction plates 54, and the plurality of dynamic friction plates 53 rotate synchronously with the mover assembly 2, and the plurality of static friction plates 54 are connected to the fixed base 41; The dynamic friction plate 53 and the static friction plates 54 are arranged alternately, and an armature 43 is movably arranged between the friction plate assembly 5 and the electromagnet 42. The end of the armature 43 away from the electromagnet 42 can squeeze the dynamic friction plate 53 and the static friction plate 54 and change the distance between the dynamic friction plate 53 and the static friction plate 54. An integral diaphragm spring assembly 44 is arranged between the fixed base 41 and the armature 43, and the two end surfaces of the integral diaphragm spring assembly 44 are fixedly connected to the armature 43 and the fixed base 41 respectively.

[0046] In actual use, when the electromagnet 42 is energized, an attractive force is generated between the electromagnet 42 and the armature 43, and the attractive force is greater than the elastic pressure generated by the integral diaphragm spring assembly 44. The armature 43 is held on the end face of the electromagnet 42, and the integral diaphragm spring assembly 44 is in a compressed state, so that the plurality of dynamic friction plates 53 and the plurality of static friction plates 54 are not compressed, that is, the mover assembly is not braked. At this time, the mover assembly rotates relative to the stator mechanism, and the rotating table mechanism rotates synchronously with the mover assembly. When the electromagnet 42 is powered off, the attraction of the electromagnet to the armature 43 disappears instantly, and the integral diaphragm spring assembly 44 is immediately restored. Under the elastic pressure of the integral diaphragm spring assembly 44, the armature 43 instantly moves toward the dynamic friction plate 53 and the static friction plate 54 and squeezes the dynamic friction plate 53 and the static friction plate 54, so that the dynamic friction plates 53 and the static friction plates 54 are compressed. Due to the friction resistance between the dynamic friction plates 53 and the static friction plates 54, the dynamic friction plates 53 cannot rotate, thereby braking the mover assembly 2; therefore, the diaphragm spring electromagnetic brake mechanism in this embodiment instantly provides braking torque for the turntable mechanism, and can effectively achieve emergency braking of the turntable mechanism in an emergency situation of sudden power failure, thereby avoiding the risk of collision.

[0047] In this embodiment, an integral diaphragm spring assembly 44 is provided in the electromagnetic brake mechanism to replace the spiral spring in the prior art. Since the integral diaphragm spring assembly 44 is rigid in the circumferential direction, it can only perform extension and compression movements in the longitudinal direction, and cannot perform torsional movements in the circumferential direction. Therefore, by respectively fixing the two end surfaces of the integral diaphragm spring assembly 44 to the armature 43 and the fixed base 41, the integral diaphragm spring assembly 44, the armature 43 and the fixed base 41 are fixedly connected to form a whole. Thus, by virtue of the rigidity of the integral diaphragm spring assembly 44 in the circumferential direction, the armature 43 is restricted from rotating and deflecting in the circumferential direction, ensuring that the armature 43 can only move in the longitudinal direction. On the one hand, there is no need to provide a guide shaft in the electromagnetic brake mechanism, which simplifies the structure and avoids wear between the armature 43 and the guide shaft. On the other hand, the armature 43 and the rotary table mechanism are prevented from deflecting in the circumferential direction. Even under the processing pressure of the tool, the armature 43 and the rotary table mechanism will not deflect, thereby ensuring the precise positioning requirement during workpiece processing. Furthermore, in this embodiment, the diaphragm electromagnetic brake mechanism is integrated with the stator assembly and the mover assembly in the torque motor mechanism, thereby effectively saving space and reducing the volume of the CNC rotary table.

[0048] Furthermore, permanent magnets are disposed on both the dynamic friction plate 53 and the static friction plate 54, and the adjacent dynamic friction plates 53 and static friction plates 54 repel each other, and the repulsive force is much smaller than the elastic pressure exerted by the integral diaphragm spring assembly 44 on the armature 43. Specifically, the dynamic friction plate 53 and the static friction plate 54 are both annular, and when the dynamic friction plate 53 and the static friction plate 54 are manufactured, a plurality of permanent magnets are evenly disposed inside the dynamic friction plate 53 and the static friction plate 54, and the plurality of permanent magnets are located on the same circumference. Fig. 9As shown, the magnetic poles of the adjacent dynamic friction plates 53 and static friction plates 54 on the side close to each other are the same, so that the adjacent dynamic friction plates 53 and static friction plates 54 repel each other. When the electromagnet 42 is energized, an attractive force is generated between the electromagnet 42 and the armature 43, and the armature 43 is held on the end face of the electromagnet 42. The armature 43 does not apply pressure to the dynamic friction plates 53 and the static friction plates 54. Several dynamic friction plates 53 and several static friction plates 54 are separated from each other due to the mutual repulsion force generated by the permanent magnet, which effectively eliminates the friction resistance between the dynamic friction plates 53 and the static friction plates 54 during the rotation of the mover assembly 2. Furthermore, the mutual repulsion between the adjacent dynamic friction plates 53 and static friction plates 54 is greater than the gravity of the dynamic friction plates 53 or static friction plates 54, so that when the central axis of the CNC rotary table is set in the vertical direction, the dynamic friction plates 53 and static friction plates 54 can also overcome their own gravity and separate from each other. Therefore, in actual use, the CNC rotary table in this embodiment can be set in both the horizontal direction and the vertical direction, and has a wide range of applications. Preferably, the value of the elastic pressure applied by the integral diaphragm spring assembly 44 to the armature 43 is 10 to 100 times the value of the mutual repulsion between all the dynamic friction plates 53 and static friction plates 54.

[0049] Furthermore, if Fig.11 As shown, a first annular protrusion 431 is provided at one end of the armature 43 close to the dynamic friction plate 53 and the static friction plate 54. The first annular protrusion 431 is directly opposite to the dynamic friction plate 53 and the static friction plate 54, so that the armature 43 can apply extrusion force to the dynamic friction plate 53 and the static friction plate 54.

[0050] Furthermore, if Figure 6 As shown, the friction plate assembly 5 further includes a first sleeve 51 and a second sleeve 52, wherein the first sleeve 51 is disposed inside the movable subassembly 2 and is fixedly connected to the movable subassembly 2, the plurality of dynamic friction plates 53 are disposed in the first sleeve 51 and rotate synchronously with the first sleeve 51, the second sleeve 52 is disposed inside the first sleeve 51 and is fixedly connected to the fixed base 41, and the plurality of static friction plates 54 are sleeved on the outside of the second sleeve 52. Preferably, as Figure 7 As shown, a plurality of first insertion grooves 511 are provided on the wall of the first sleeve 51, and a plurality of first insertion blocks 531 are provided protruding outwardly from the outer peripheral side of the dynamic friction plate 53, and the first insertion blocks 531 are inserted into the first insertion grooves 511. Figure 8 As shown, a plurality of second plug-in grooves 521 are provided on the wall of the second sleeve 52 , and a plurality of second plug-in blocks 541 are provided on the inner circumference of the static friction plate 54 protruding inwardly, and the second plug-in blocks 541 are inserted into the second plug-in grooves 521 .

[0051] In actual use, when the movable subassembly 2 rotates, the first sleeve 51 rotates with the movable subassembly 2. Due to the cooperation between the first plug-in block 531 and the first plug-in slot 511, the first sleeve 51 drives the dynamic friction plate 53 to rotate synchronously. Due to the cooperation between the second plug-in block 541 and the second plug-in slot 521, the static friction plate 54 and the second sleeve 52 remain in a stationary state. When braking, under the pressure of the armature 43, the dynamic friction plate 53 and the static friction plate 54 both move linearly along the longitudinal direction, so that a number of dynamic friction plates 53 and a number of static friction plates 54 fit closely together, and the dynamic friction plate 53 stops rotating under the action of friction resistance. Similarly, due to the cooperation between the first plug-in block 531 and the first plug-in slot 511, the first sleeve 51 and the movable subassembly 2 stop rotating, thereby achieving braking. In this embodiment, by cooperating with the first plug-in block 531 and the first plug-in slot 511, the dynamic friction plate 53 and the first sleeve 51 can move synchronously in the circumferential direction, and the dynamic friction plate 53 can move independently in the longitudinal direction relative to the first sleeve 51; similarly, by cooperating with the second plug-in block 541 and the second plug-in slot 521, the static friction plate 54 and the second sleeve 52 can remain synchronously stationary in the circumferential direction, and the static friction plate 54 can move linearly in the longitudinal direction relative to the second sleeve 52.

[0052] Furthermore, if Figure 5-6 As shown, the friction plate assembly 5 further includes a spacing adjustment pressing block 55, which is disposed on a side of the dynamic friction plate 53 and the static friction plate 54 away from the armature 43, and the spacing adjustment pressing block 55 is threadedly connected to the second sleeve 52. Specifically, as Fig.12 As shown, the spacing adjustment pressure block 55 has a second annular protrusion 551, the end face of which is in contact with the outermost dynamic friction plate 53 or the static friction plate 54 away from the armature 43; and a through hole is provided in the middle of the spacing adjustment pressure block 55, so that the spacing adjustment pressure block 55 is sleeved on the outer side of the second sleeve 52 and is threadedly connected to the second sleeve 52. In this embodiment, the dynamic friction plate 53 and the static friction plate 54 will wear due to the friction resistance during the braking process. Therefore, after a period of use, the thickness of the dynamic friction plate 53 and the static friction plate 54 will decrease. In order to ensure that the diaphragm spring type electromagnetic brake mechanism can work normally, the spacing adjustment block 55 can be regularly screwed according to the specific wear conditions of the dynamic friction plate 53 and the static friction plate 54 to adjust its position on the outside of the second sleeve 52, thereby adjusting the spacing between the multiple dynamic friction plates 53 and the multiple static friction plates 54, ensuring that when the integral diaphragm spring assembly 44 is fully extended, the multiple dynamic friction plates 53 and the multiple static friction plates 54 can be pressed by the armature 43, thereby effectively extending the service life of the diaphragm spring type electromagnetic brake mechanism.

[0053] Furthermore, if Fig.13 As shown, the integral diaphragm spring assembly 44 includes two diaphragm springs 441, each of which includes a large end face and a small end face. The large end faces of the two diaphragm springs 441 are arranged opposite to each other and the outer peripheries of the two large end faces are fixedly connected; the two small end faces are respectively fixedly connected to the armature 43 and the fixed base 41. Specifically, the two large end faces are fixedly connected by welding, riveting or other connection methods. In this embodiment, by fixing the two diaphragm springs 441 to form an integral diaphragm spring assembly 44, it is beneficial to improve the rigidity of the integral diaphragm spring assembly 44 along the circumferential direction, and further prevent the armature 43 and the rotating table mechanism from deviating in the circumferential direction.

[0054] Further, the stator assembly 1 includes a stator fixing sleeve 11 and a stator 12 disposed inside the stator fixing sleeve 11, the mover assembly 2 is rotatably disposed inside the stator 12, the mover assembly includes a mover fixing sleeve 21 and a mover 22 disposed on the outer peripheral side of the mover fixing sleeve 21, the rotating table 31 is fixedly connected to the mover fixing sleeve 21, the fixed base 41 is fixedly connected to the stator fixing sleeve 11, and a first bearing 6 is disposed between the mover fixing sleeve 21 and the stator fixing sleeve 11. In this embodiment, by disposing the first bearing 6 between the mover fixing sleeve 21 and the stator fixing sleeve 11, relative rotational motion between the mover fixing sleeve 21 and the stator fixing sleeve 11 is facilitated.

[0055] Furthermore, the rotating table mechanism further includes a central sleeve 32 and an encoder, the encoder includes a scale plate 33 and a reading head 34, a through hole 45 is provided in the middle of the fixed base 41, one end of the central sleeve 32 is fixed to the inner end surface of the rotating table 31, the other end of the central sleeve 32 extends into the through hole 45, and the scale plate 33 is provided at the other end, and the reading head 34 is opposite to the scale plate 33 and is provided on the fixed base 41. In this embodiment, by providing the central sleeve 32 on the inner end surface of the rotating table 31, and installing the scale plate 33 at the other end of the central sleeve 32, when the rotating table 31 rotates, the central sleeve 32 and the scale plate 33 can be synchronously driven to perform synchronous rotational motion together, so that the encoder can measure the rotation angle of the rotating table 31 in real time, and at the same time, the layout of the rotating table mechanism is reasonable and compact. Preferably, a second bearing 8 is provided between the central sleeve 32 and the fixed base 41, so that the central sleeve 32 can perform stable rotational motion.

[0056] Furthermore, if Figure 5 and 10As shown, the fixed base 41 specifically includes a connecting seat body 411, one end of the connecting seat body 411 close to the torque motor mechanism is fixedly connected to the stator fixing sleeve 11, a first through hole is provided at the center of the connecting seat body 411, a first fixing ring 412 is fixedly connected in the first through hole, an annular mounting groove 415 is formed between the outer wall of the first fixing ring 412 and the inner wall of the connecting seat body 411, and the annular mounting groove 415 is used to install the electromagnet 42; a second through hole is provided at the center of the first fixing ring 412, a second fixing ring 413 is fixedly connected in the second through hole, a third fixing ring 414 is fixed at one end of the second fixing ring 413 away from the first fixing ring 412, and through holes are also provided at the center positions of the second fixing ring 413 and the third fixing ring 414, an integral diaphragm spring assembly 44 and an armature 43 are sleeved on the outer walls of the second fixing ring 413 and the third fixing ring 414; one end of the third fixing ring 414 away from the second fixing ring 413 is fixedly connected to the second sleeve 52. In this embodiment, by configuring the fixed base 41 to be a plurality of parts connected to each other, the manufacturing of the fixed base 41 and the installation of the diaphragm spring type electromagnetic brake mechanism are facilitated.

[0057] Furthermore, it also includes an oil circuit distributor 7, which is arranged at one end of the fixed base 41 away from the torque motor mechanism, and the central axis of the oil circuit distributor 7 extends to the inside of the center sleeve 32. In this embodiment, by arranging the oil circuit distributor 7 at one end of the fixed base 41 away from the torque motor mechanism, on the one hand, it is convenient to provide an oil circuit for external equipment and make the overall structure more reasonable and compact, and on the other hand, it can play the role of a protective cover to protect the internal parts of the CNC rotary table. Preferably, a third bearing 9 is arranged between the outer wall of the center shaft and the inner wall of the center sleeve 32, so that the center sleeve 32 can rotate relative to the oil circuit distributor 7.

[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A CNC rotary table with a diaphragm spring electromagnetic brake, comprising a torque motor mechanism, a diaphragm spring electromagnetic brake mechanism and a rotary table mechanism, characterized in that: The torque motor mechanism comprises a stator assembly (1) and a mover assembly (2); The rotating table mechanism comprises a rotating table (31), wherein the rotating table (31) is arranged at one end of the torque motor mechanism and is fixedly connected to the mover assembly (2); The diaphragm spring type electromagnetic brake mechanism comprises a fixed base (41), the fixed base (41) is arranged at the other end of the torque motor mechanism and is fixedly connected to the stator assembly (1), an electromagnet (42) is fixed on the fixed base (41), a friction plate assembly (5) is arranged on the side of the electromagnet (42) away from the fixed base (41), the friction plate assembly (5) comprises a plurality of dynamic friction plates (53) and a plurality of static friction plates (54), the plurality of dynamic friction plates (53) rotate synchronously with the mover assembly (2), and the plurality of static friction plates (54) are connected to the fixed base (41); the plurality of dynamic friction plates (53) rotate synchronously with the mover assembly (2), and the plurality of static friction plates (54) are connected to the fixed base (41); The friction plates (53) and a plurality of the static friction plates (54) are arranged alternately, an armature (43) is movably arranged between the friction plate assembly (5) and the electromagnet (42), and one end of the armature (43) away from the electromagnet (42) can squeeze the dynamic friction plate (53) and the static friction plate (54) and change the distance between the dynamic friction plate (53) and the static friction plate (54), and an integral diaphragm spring assembly (44) is arranged between the fixed base (41) and the armature (43), and the two end surfaces of the integral diaphragm spring assembly (44) are respectively fixedly connected to the armature (43) and the fixed base (41).

2. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 1, characterized in that: Permanent magnets are provided on both the dynamic friction plate (53) and the static friction plate (54), and the adjacent dynamic friction plates (53) and static friction plates (54) repel each other, and the repulsive force is much smaller than the elastic pressure applied by the integral diaphragm spring assembly (44) to the armature (43).

3. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 1, characterized in that: The friction plate assembly (5) further comprises a first sleeve (51) and a second sleeve (52); the first sleeve (51) is arranged inside the movable subassembly (2) and is fixedly connected to the movable subassembly (2); the plurality of dynamic friction plates (53) are arranged in the first sleeve (51) and rotate synchronously with the first sleeve (51); the second sleeve (52) is arranged inside the first sleeve (51) and is fixedly connected to the fixed base (41); and the plurality of static friction plates (54) are sleeved on the outside of the second sleeve (52).

4. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 3, characterized in that: A plurality of first plug-in grooves (511) are arranged on the wall of the first sleeve (51), and a plurality of first plug-in blocks (531) are arranged protruding outward from the outer peripheral side of the dynamic friction plate (53), and the first plug-in blocks (531) are inserted into the first plug-in grooves (511).

5. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 3, characterized in that: A plurality of second plug-in grooves (521) are arranged on the wall of the second sleeve (52), and a plurality of second plug-in blocks (541) are arranged on the inner peripheral side of the static friction plate (54) protruding inwardly, and the second plug-in blocks (541) are inserted into the second plug-in grooves (521).

6. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 3, characterized in that: The friction plate assembly (5) further comprises a spacing adjustment pressure block (55), wherein the spacing adjustment pressure block (55) is arranged on a side of the dynamic friction plate (53) and the static friction plate (54) away from the armature (43), and the spacing adjustment pressure block (55) is threadedly connected to the second sleeve (52).

7. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 1, characterized in that: The integral diaphragm spring assembly (44) comprises two diaphragm springs (441), each of the diaphragm springs (441) comprising a large end face and a small end face, the large end faces of the two diaphragm springs (441) are arranged opposite to each other and the outer peripheries of the two large end faces are fixedly connected; the two small end faces are respectively fixedly connected to the armature (43) and the fixed base (41).

8. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 1, characterized in that: The stator assembly (1) comprises a stator fixing sleeve (11) and a stator (12) arranged inside the stator fixing sleeve (11); the mover assembly (2) is rotatably arranged inside the stator (12); the mover assembly comprises a mover fixing sleeve (21) and a mover (22) arranged on the outer peripheral side of the mover fixing sleeve (21); the rotating table (31) is fixedly connected to the mover fixing sleeve (21); the fixed base (41) is fixedly connected to the stator fixing sleeve (11); and a first bearing (6) is arranged between the mover fixing sleeve (21) and the stator fixing sleeve (11).

9. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 1, characterized in that: The rotating table mechanism further comprises a central sleeve (32) and an encoder, wherein the encoder comprises a scale disk (33) and a reading head (34), a through hole (45) is arranged in the middle of the fixed base (41), one end of the central sleeve (32) is fixed to the inner end surface of the rotating table (31), the other end of the central sleeve (32) extends into the through hole (45), and the scale disk (33) is arranged at the other end, and the reading head (34) is opposite to the scale disk (33) and arranged on the fixed base (41).

10. The CNC rotary table with diaphragm spring electromagnetic brake according to claim 9, characterized in that: It also includes an oil circuit distributor (7), which is arranged at one end of the fixed base (41) away from the torque motor mechanism, and the central axis of the oil circuit distributor (7) extends to the interior of the central sleeve (32).

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