A CNC rotary table with a diaphragm spring electromagnetic brake

Abstract

This invention relates to 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. The diaphragm spring electromagnetic brake mechanism includes a fixed base, an electromagnet, a friction plate assembly, an armature, and an integral diaphragm spring assembly. The friction plate assembly includes several moving friction plates and several stationary friction plates. The moving friction plates rotate synchronously with the moving part assembly, and the stationary friction plates are connected to the fixed base. The moving and stationary friction plates are arranged alternately. An armature is movably disposed between the friction plate assembly and the electromagnet. An integral diaphragm spring assembly is disposed between the fixed base and the armature, with its two end surfaces fixedly connected to the armature and the fixed base, respectively. By using the integral diaphragm spring assembly, its circumferential rigidity effectively prevents the armature and the rotary table mechanism from shifting circumferentially, ensuring accurate workpiece positioning and simplifying the structure.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tools, and in particular to a CNC rotary table with a diaphragm spring electromagnetic brake. Background Technology

[0002] The CNC rotary table is a core component of CNC machine tools such as CNC lathes, CNC milling machines, CNC grinding machines, and machining centers. To improve accuracy, existing CNC rotary tables typically use a torque motor drive mechanism to rotate. When a stop command is received, a dynamic braking circuit brakes the motor. However, this braking method has relatively low self-locking force, and during the stop phase, the machining pressure of the tool on the workpiece can easily cause slow slippage, failing to guarantee the precise positioning requirements during workpiece machining. Furthermore, this braking method cannot achieve emergency braking of the CNC rotary table in the event of a sudden power outage, posing a risk of collision and serious damage. Therefore, it is often necessary to install a braking mechanism within the CNC rotary table to ensure precise positioning and emergency braking in the event of a power outage.

[0003] Currently, the most common braking mechanism on CNC rotary tables is the hydraulic braking mechanism, as seen in Chinese invention applications CN107331234A and CN115008214A. During braking, the hydraulic components draw hydraulic power from an external control tank to move the dynamic friction ring axially, pressing it against the rotating component for braking. During unloading, the hydraulic components draw hydraulic power from the external control tank to move the dynamic friction ring in the opposite direction, releasing the pressure on the rotating component and disengaging the brake. Therefore, the hydraulic braking mechanism requires a pressure increase or decrease process during braking, meaning it needs a certain reaction time. Consequently, the hydraulic braking mechanism struggles to provide instantaneous braking torque in emergency situations such as sudden power outages, resulting in poor emergency braking performance.

[0004] Because spring-type electromagnetic brakes lose their electromagnetic attraction immediately upon a sudden power outage, the armature and brake pads can instantly engage with the brake disc under the action of the spring, providing braking torque. This rapid response is a significant advantage, leading to their increasing application in CNC rotary tables. However, existing spring-type electromagnetic brake mechanisms typically use helical springs, which are prone to circumferential torsion. Therefore, a guide shaft is needed in the helical spring-type electromagnetic brake mechanism to ensure the direction of armature movement and prevent circumferential deflection. For example, Chinese utility model patent CN214036598U uses bolts to guide the movement of the armature. However, due to the certain clearance between the guide shaft and the armature, and wear after long-term use, the clearance between the armature and the guide shaft increases. Consequently, the armature will experience a slight circumferential offset, especially under the machining pressure of the cutting tool. This offset can cause the CNC rotary table to also shift, making it impossible to guarantee the precise positioning requirements during workpiece machining.

[0005] Moreover, the existing braking mechanism and drive mechanism are set up separately, which will occupy more space and thus increase the overall size of the CNC machine tool.

[0006] Therefore, there is an urgent need to provide a technical solution to address the aforementioned technical problems. Summary of the Invention

[0007] In order to overcome the defects and deficiencies in the existing technology, the purpose of this invention is to design a CNC rotary table with a diaphragm spring electromagnetic brake. Relying on the rigidity of the diaphragm spring itself in the circumferential direction and the inability to twist in the circumferential direction, the armature is prevented from shifting circumferentially. This satisfies the requirement of providing braking torque instantly, ensures the requirement of accurate positioning during workpiece processing, and can effectively reduce the size of the CNC machine tool.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A CNC rotary table with a diaphragm spring electromagnetic brake includes a torque motor mechanism, a diaphragm spring electromagnetic brake mechanism, and a rotary table mechanism. The torque motor mechanism includes a stator assembly and a mover assembly.

[0010] The rotary table mechanism includes a rotary table, which is disposed at one end of the torque motor mechanism and fixedly connected to the moving part assembly;

[0011] The diaphragm spring electromagnetic brake mechanism includes a fixed base, which is disposed 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 disposed on the side of the electromagnet away from the fixed base. The friction plate assembly includes several moving friction plates and several stationary friction plates. The moving friction plates rotate synchronously with the moving part assembly. The stationary friction plates are connected to the fixed base. The moving friction plates and stationary friction plates are arranged alternately. An armature is movably disposed between the friction plate assembly and the electromagnet. The end of the armature away from the electromagnet can compress the moving friction plates and stationary friction plates and change the distance between them. An integral diaphragm spring assembly is disposed between the fixed base and the armature. The two end surfaces of the integral diaphragm spring assembly are fixedly connected to the armature and the fixed base, respectively.

[0012] More specifically, both the moving friction plate and the stationary friction plate are provided with permanent magnets. Adjacent moving friction plates and stationary friction plates repel each other, and the repulsive force is much smaller than the elastic pressure applied to the armature by the integral diaphragm spring assembly.

[0013] More specifically, the friction pad assembly further includes a first sleeve and a second sleeve. The first sleeve is disposed inside the moving part assembly and is fixedly connected to the moving part assembly. The plurality of moving friction pads are disposed in the first sleeve and rotate synchronously with the first sleeve. The second sleeve is disposed inside the first sleeve and is fixedly connected to the fixed base. The plurality of stationary friction pads are sleeved on the outside of the second sleeve.

[0014] More specifically, the first sleeve has a plurality of first insertion grooves on its cylindrical wall, and the outer periphery of the dynamic friction plate has a plurality of first insertion blocks protruding outward, the first insertion blocks being inserted into the first insertion grooves.

[0015] More specifically, the second sleeve has a plurality of second insertion grooves on its cylindrical wall, and the inner circumference of the static friction plate has a plurality of second insertion blocks protruding inward, the second insertion blocks being inserted into the second insertion grooves.

[0016] More specifically, the friction plate assembly further includes a spacing adjustment block, which is disposed on the side of the moving friction plate and the stationary friction plate away from the armature, and the spacing adjustment 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 each other and are fixedly connected to the outer periphery of the two large end faces. 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 disposed inside the stator fixing sleeve. The mover assembly is rotatably disposed inside the stator. The mover assembly includes a mover fixing sleeve and a mover disposed on the outer periphery of the mover fixing sleeve. The rotary table is fixedly connected to the mover fixing sleeve. The fixed base is fixedly connected to the stator fixing sleeve. A first bearing is disposed between the mover fixing sleeve and the stator fixing sleeve.

[0019] More specifically, the rotary table mechanism further includes a central 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 central sleeve is fixed to the inner end face of the rotary table, and the other end of the central sleeve extends into the through hole and is provided with the scale disk at the other end. 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 disposed at the end of the fixed base away from the torque motor mechanism, and the central axis of the oil circuit distributor extends into the interior of the central sleeve.

[0021] The beneficial effects of this invention are:

[0022] (1) By replacing the helical spring in the prior art with an integral diaphragm spring assembly in the electromagnetic brake mechanism, since the integral diaphragm spring assembly is rigid in the circumferential direction, it can only extend and compress in the longitudinal direction and cannot torsion in the circumferential direction. Therefore, by fixing the two ends of the integral diaphragm spring assembly to the armature and the fixed base respectively, the integral diaphragm spring assembly, the armature and the fixed base are fixedly connected as a whole. Thus, by using the rigidity of the integral diaphragm spring assembly in the circumferential direction, the rotational displacement of the armature in the circumferential direction is restricted, ensuring that the armature can only move in the longitudinal direction. On the one hand, there is no need to set 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, it effectively prevents the armature and the rotary table mechanism from shifting in the circumferential direction. Even under the processing pressure of the tool, the armature and the rotary table mechanism will not shift, ensuring the accurate positioning requirements during workpiece processing.

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

[0024] (3) By setting permanent magnets on both the moving friction plate and the stationary friction plate, the adjacent moving friction plate and the stationary friction plate repel each other. When the armature does not apply pressure to the moving friction plate and the stationary friction plate, the moving friction plate and the stationary friction plate are separated from each other due to the mutual repulsion force generated by the permanent magnet, which effectively eliminates the frictional resistance between the moving friction plate and the stationary friction plate during the rotation of the moving part assembly. Furthermore, the mutual repulsion force between the adjacent moving friction plate and the stationary friction plate is greater than the weight of the moving friction plate or the stationary friction plate itself, so that when the central axis of the CNC rotary table is set in the vertical direction, the moving friction plate and the stationary friction plate can also overcome their own weight and separate from each other. Therefore, the CNC rotary table can be set in both the horizontal and vertical directions, and has a wide range of applications.

[0025] (4) According to the specific wear condition of the moving friction plate and the stationary friction plate, the spacing adjustment block is turned on periodically to adjust its position on the outside of the second sleeve, thereby adjusting the spacing between several moving friction plates and several stationary friction plates, ensuring that when the integral diaphragm spring assembly is fully extended, several moving friction plates and several stationary friction plates can be pressed together by the armature, effectively extending the service life of the diaphragm spring electromagnetic brake mechanism. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the CNC rotary table with diaphragm spring electromagnetic brake according to the present invention.

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

[0028] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0029] Figure 4 for Figure 2 A magnified structural diagram at point B in the middle.

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

[0031] Figure 6 This is an exploded structural diagram of the friction pad assembly of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure of the first sleeve and the moving friction plate of the present invention.

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

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

[0035] Figure 10 This is a schematic diagram of the structure of the fixed base of the present invention.

[0036] Figure 11 This is a schematic diagram of the armature structure of the present invention.

[0037] Figure 12 This is a schematic diagram of the spacing adjustment pressure block of the present invention.

[0038] Figure 13 This is a schematic diagram of the integral diaphragm spring assembly of the present invention.

[0039] Figure 14 This is a schematic diagram of the torque motor mechanism and rotary table of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Stator assembly; 11-Stator retaining sleeve; 12-Stator; 2-Motor assembly; 21-Motor retaining sleeve; 22-Motor; 31-Rotating table; 32-Center sleeve; 33-Scale disk; 34-Reading head; 35-Mounting bracket; 41-Fixed base; 411-Connecting seat; 412-First retaining ring; 413-Second retaining ring; 414-Third retaining 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 insertion groove; 52-Second sleeve; 521-Second insertion groove; 53-Dynamic friction plate; 531-First insertion block; 54-Static friction plate; 541-Second insertion block; 55-Gap adjusting pressure block; 551-Second annular protrusion; 6-First bearing; 7-Oil circuit distributor; 8-Second bearing; 9-Third bearing. Detailed Implementation

[0042] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

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

[0044] The rotary table mechanism includes a rotary table 31, which is disposed at one end of the torque motor mechanism and is fixedly connected to the moving part assembly 2.

[0045] The diaphragm spring electromagnetic brake mechanism includes a fixed base 41, which is disposed at the other end of the torque motor mechanism and fixedly connected to the stator assembly 1. An electromagnet 42 is fixed on the fixed base 41. A friction plate assembly 5 is disposed on the side of the electromagnet 42 away from the fixed base 41. The friction plate assembly 5 includes a plurality of moving friction plates 53 and a plurality of stationary friction plates 54. The plurality of moving friction plates 53 rotate synchronously with the rotor assembly 2, and the plurality of stationary friction plates 54 are connected to the fixed base 41. The moving friction plate 53 and several stationary friction plates 54 are arranged alternately. 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 moving friction plate 53 and the stationary friction plate 54 and change the distance between the moving friction plate 53 and the stationary friction plate 54. An integral diaphragm spring assembly 44 is arranged between the fixed base 41 and the armature 43. 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. 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. As a result, the moving friction plates 53 and the stationary friction plates 54 are not pressed together, that is, the moving assembly is not braked. At this time, the moving assembly rotates relative to the stator mechanism, and the rotary table mechanism rotates synchronously with the moving assembly. When the electromagnet 42 is de-energized, the attraction of the electromagnet to the armature 43 disappears instantly, and the integral diaphragm spring assembly 44 immediately recovers. Under the elastic pressure of the integral diaphragm spring assembly 44, the armature 43 moves instantaneously toward the moving friction plate 53 and the stationary friction plate 54, pressing the moving friction plate 53 and the stationary friction plate 54 together. Due to the frictional resistance between the moving friction plate 53 and the stationary friction plate 54, the moving friction plate 53 cannot rotate, thereby enabling the moving part assembly 2 to brake. Therefore, the diaphragm spring electromagnetic brake mechanism in this embodiment provides braking torque to the rotary table mechanism instantaneously, and can effectively achieve emergency braking of the rotary table mechanism in the event of a sudden power outage, avoiding the risk of collision.

[0047] In this embodiment, an integral diaphragm spring assembly 44 is used in the electromagnetic brake mechanism instead of the helical spring in the prior art. Since the integral diaphragm spring assembly 44 is rigid in the circumferential direction, it can only extend and compress in the longitudinal direction and cannot torsion in the circumferential direction. Therefore, by fixing the two end surfaces of the integral diaphragm spring assembly 44 to the armature 43 and the fixed base 41 respectively, the integral diaphragm spring assembly 44, the armature 43 and the fixed base 41 are fixedly connected as a whole. Thus, by utilizing the rigidity of the integral diaphragm spring assembly 44 in the circumferential direction, the rotational displacement of the armature 43 in the circumferential direction is restricted, ensuring that the armature 43 can only move in the longitudinal direction. On the one hand, there is no need to set 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, it prevents the armature 43 and the rotary table mechanism from shifting in the circumferential direction. Even under the processing pressure of the tool, the armature 43 and the rotary table mechanism will not shift, ensuring the precise positioning requirements during workpiece processing. Furthermore, in this embodiment, by integrating the diaphragm electromagnetic brake mechanism with the stator and mover components of the torque motor mechanism, space is effectively saved and the volume of the CNC rotary table is reduced.

[0048] Furthermore, both the moving friction plate 53 and the stationary friction plate 54 are provided with permanent magnets. Adjacent moving friction plates 53 and stationary 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, both the moving friction plate 53 and the stationary friction plate 54 are annular. During the manufacturing of the moving friction plate 53 and the stationary friction plate 54, a plurality of permanent magnets are uniformly arranged inside each of the moving friction plate 53 and the stationary friction plate 54, and the plurality of permanent magnets are located on the same circumference. Figure 9As shown, the magnetic poles on the sides of adjacent moving friction plates 53 and stationary friction plates 54 are the same, which causes the adjacent moving friction plates 53 and stationary friction plates 54 to repel each other. When the electromagnet 42 is energized, an attractive force is generated between the electromagnet 42 and the armature 43. The armature 43 is held on the end face of the electromagnet 42. The armature 43 does not apply pressure to the moving friction plates 53 and stationary friction plates 54. The moving friction plates 53 and the stationary friction plates 54 are separated from each other due to the mutual repulsive force generated by the permanent magnet, which effectively eliminates the frictional resistance between the moving friction plates 53 and stationary friction plates 54 during the rotation of the moving assembly 2. Furthermore, the repulsive force between adjacent moving friction plates 53 and stationary friction plates 54 is greater than the weight of either moving friction plate 53 or stationary friction plate 54. This allows the moving friction plates 53 and stationary friction plates 54 to overcome their own weight and separate when the central axis of the CNC rotary table is set vertically. Therefore, in practical use, the CNC rotary table in this embodiment can be set both horizontally and vertically, making it widely applicable. Preferably, the elastic pressure applied by the integral diaphragm spring assembly 44 to the armature 43 is 10 to 100 times the value of the repulsive force between all moving friction plates 53 and stationary friction plates 54.

[0049] Furthermore, such as Figure 11 As shown, the armature 43 has a first annular protrusion 431 at one end near the moving friction plate 53 and the stationary friction plate 54. The first annular protrusion 431 is positioned directly opposite the moving friction plate 53 and the stationary friction plate 54, which facilitates the armature 43 to apply a compressive force to the moving friction plate 53 and the stationary friction plate 54.

[0050] Furthermore, such as Figure 6 As shown, the friction pad assembly 5 further includes a first sleeve 51 and a second sleeve 52. The first sleeve 51 is disposed inside the moving part assembly 2 and fixedly connected to the moving part assembly 2. A plurality of moving friction pads 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 fixedly connected to the fixed base 41. A plurality of stationary friction pads 54 are sleeved on the outside of the second sleeve 52. Preferably, as shown... Figure 7 As shown, the first sleeve 51 has a plurality of first insertion slots 511 on its cylindrical wall, and the moving friction plate 53 has a plurality of first insertion blocks 531 protruding outward from its outer periphery, the first insertion blocks 531 being inserted into the first insertion slots 511. Figure 8 As shown, the second sleeve 52 has a plurality of second insertion grooves 521 on its cylindrical wall, and the inner circumference of the static friction plate 54 has a plurality of second insertion blocks 541 protruding inward, and the second insertion blocks 541 are inserted into the second insertion grooves 521.

[0051] In actual use, when the moving part assembly 2 rotates, the first sleeve 51 rotates along with the moving part assembly 2. Due to the cooperation between the first insertion block 531 and the first insertion groove 511, the first sleeve 51 drives the moving friction plate 53 to rotate synchronously. Due to the cooperation between the second insertion block 541 and the second insertion groove 521, the stationary friction plate 54 and the second sleeve 52 remain stationary. When braking, under the pressure of the armature 43, both the moving friction plate 53 and the stationary friction plate 54 move linearly in the longitudinal direction, so that several moving friction plates 53 and several stationary friction plates 54 are tightly attached. The moving friction plate 53 stops rotating under the action of frictional resistance. Similarly, due to the cooperation between the first insertion block 531 and the first insertion groove 511, the first sleeve 51 and the moving part assembly 2 stop rotating, thus achieving braking. In this embodiment, the first insertion block 531 cooperates with the first insertion slot 511, enabling the dynamic friction plate 53 and the first sleeve 51 to move synchronously in the circumferential direction, and the dynamic friction plate 53 can also move independently relative to the first sleeve 51 in the longitudinal direction; similarly, the second insertion block 541 cooperates with the second insertion slot 521, enabling the static friction plate 54 and the second sleeve 52 to remain synchronously stationary in the circumferential direction, and the static friction plate 54 can also move linearly relative to the second sleeve 52 in the longitudinal direction.

[0052] Furthermore, such as Figure 5-6 As shown, the friction plate assembly 5 further includes a spacing adjustment block 55, which is disposed on the side of the moving friction plate 53 and the stationary friction plate 54 away from the armature 43, and the spacing adjustment block 55 is threadedly connected to the second sleeve 52. Specifically, as... Figure 12 As shown, the spacing adjustment block 55 has a second annular protrusion 551, the end face of which contacts the outermost moving friction plate 53 or static friction plate 54 away from the armature 43; and a through hole is provided in the middle of the spacing adjustment block 55, so that the spacing adjustment block 55 is sleeved on the outside of the second sleeve 52 and threadedly connected to the second sleeve 52. In this embodiment, the moving friction plate 53 and the stationary friction plate 54 will wear down due to frictional resistance during braking. Therefore, after a period of use, the thickness of the moving friction plate 53 and the stationary friction plate 54 will decrease. In order to ensure that the diaphragm spring electromagnetic brake mechanism can work normally, the spacing adjustment block 55 can be turned on periodically according to the specific wear condition of the moving friction plate 53 and the stationary friction plate 54, and its position outside the second sleeve 52 can be adjusted. This will adjust the spacing between the moving friction plate 53 and the stationary friction plate 54, ensuring that when the integral diaphragm spring assembly 44 is fully extended, the moving friction plate 53 and the stationary friction plate 54 can be pressed together by the armature 43, effectively extending the service life of the diaphragm spring electromagnetic brake mechanism.

[0053] Furthermore, such as Figure 13 As shown, the integral diaphragm spring assembly 44 includes two diaphragm springs 441, each of which has a large end face and a small end face. The large end faces of the two diaphragm springs 441 are arranged opposite each other and are fixedly connected to each other at their outer peripheries. 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 together as an integral diaphragm spring assembly 44, it is beneficial to improve the rigidity of the integral diaphragm spring assembly 44 in the circumferential direction, and further prevent the armature 43 and the rotary table mechanism from shifting 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 periphery of the mover fixing sleeve 21. The rotary table 31 is fixedly connected to the mover fixing sleeve 21, and the fixed base 41 is fixedly connected to the stator fixing sleeve 11. A first bearing 6 is disposed between the mover fixing sleeve 21 and the stator fixing sleeve 11. In this embodiment, by distributing the first bearing 6 between the mover fixing sleeve 21 and the stator fixing sleeve 11, relative rotational movement between the mover fixing sleeve 21 and the stator fixing sleeve 11 is facilitated.

[0055] Furthermore, the rotary table mechanism also includes a central sleeve 32 and an encoder. The encoder includes a scale disk 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 face of the rotary table 31, and the other end of the central sleeve 32 extends into the through hole 45, with the scale disk 33 provided at the other end. The reading head 34 is opposite to the scale disk 33 and is disposed on the fixed base 41. In this embodiment, by providing a central sleeve 32 on the inner end face of the rotary table 31 and installing a scale disk 33 at the other end of the central sleeve 32, when the rotary table 31 rotates, it can synchronously drive the central sleeve 32 and the scale disk 33 to rotate together, realizing the encoder to measure the rotation angle of the rotary table 31 in real time, while making the rotary table mechanism reasonably and compactly arranged. Preferably, a second bearing 8 is provided between the central sleeve 32 and the fixed base 41 to facilitate stable rotation of the central sleeve 32.

[0056] Furthermore, such as Figure 5 and 10As shown, the fixed base 41 specifically includes a connecting body 411. The end of the connecting body 411 near 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 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 side wall of the first fixing ring 412 and the inner side wall of the connecting body 411. 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 the end of the second fixing ring 413 away from the first fixing ring 412. Both the second fixing ring 413 and the third fixing ring 414 have through holes at their centers. An integral diaphragm spring assembly 44 and an armature 43 are sleeved on the outer side walls of the second fixing ring 413 and the third fixing ring 414. The 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 setting the fixed base 41 as multiple interconnected components, it is convenient to manufacture the fixed base 41 and install the diaphragm spring electromagnetic brake mechanism.

[0057] Furthermore, it also includes an oil circuit distributor 7, which is disposed at the end of the fixed base 41 away from the torque motor mechanism, and the central shaft of the oil circuit distributor 7 extends into the interior of the central sleeve 32. In this embodiment, by placing the oil circuit distributor 7 at the end of the fixed base 41 away from the torque motor mechanism, it is convenient to provide oil circuits for external equipment and make the overall structure more reasonable and compact. On the other hand, it can also act as a protective cover to protect the internal components of the CNC rotary table. Preferably, a third bearing 9 is provided between the outer wall of the central shaft and the inner wall of the central sleeve 32 to facilitate the rotational movement of the central sleeve 32 relative to the oil circuit distributor 7.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended 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 includes a stator assembly (1) and a mover assembly (2); The rotary table mechanism includes a rotary table (31), which is disposed at one end of the torque motor mechanism and is fixedly connected to the mover assembly (2); The diaphragm spring electromagnetic brake mechanism includes a fixed base (41), which is located at the other end of the torque motor mechanism and fixedly connected to the stator assembly (1). An electromagnet (42) is fixed on the fixed base (41). A friction plate assembly (5) is provided on the side of the electromagnet (42) away from the fixed base (41). The friction plate assembly (5) includes several moving friction plates (53) and several stationary friction plates (54). The moving friction plates (53) rotate synchronously with the moving part assembly (2), and the stationary friction plates (54) are connected to the fixed base (41). The friction plate (53) and several static friction plates (54) are arranged alternately. 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 moving friction plate (53) and the static friction plate (54) and change the distance between the moving 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). The two end surfaces of the integral diaphragm spring assembly (44) are fixedly connected to the armature (43) and the fixed base (41) respectively. The friction plate assembly (5) further includes a first sleeve (51) and a second sleeve (52). The first sleeve (51) is disposed inside the moving part assembly (2) and is fixedly connected to the moving part assembly (2). The plurality of moving 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). The plurality of stationary friction plates (54) are sleeved on the outside of the second sleeve (52). 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 are fixedly connected to the outer periphery of the two large end faces. The two small end faces are fixedly connected to the armature (43) and the fixed base (41) respectively.

2. The CNC rotary table with a diaphragm spring electromagnetic brake according to claim 1, characterized in that: Both the moving friction plate (53) and the stationary friction plate (54) are provided with permanent magnets. The adjacent moving friction plates (53) and the stationary 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 a diaphragm spring electromagnetic brake according to claim 1, characterized in that: The first sleeve (51) has a plurality of first insertion grooves (511) on its cylindrical wall, and the outer periphery of the dynamic friction plate (53) has a plurality of first insertion blocks (531) protruding outward, and the first insertion blocks (531) are inserted into the first insertion grooves (511).

4. The CNC rotary table with a diaphragm spring electromagnetic brake according to claim 1, characterized in that: The second sleeve (52) has a plurality of second insertion grooves (521) on its cylindrical wall, and the inner circumference of the static friction plate (54) has a plurality of second insertion blocks (541) protruding inward, and the second insertion blocks (541) are inserted into the second insertion grooves (521).

5. The CNC rotary table with a diaphragm spring electromagnetic brake according to claim 1, characterized in that: The friction plate assembly (5) further includes a spacing adjustment block (55), which is disposed on the side of the moving friction plate (53) and the stationary friction plate (54) away from the armature (43), and the spacing adjustment block (55) is threadedly connected to the second sleeve (52).

6. The CNC rotary table with a diaphragm spring electromagnetic brake according to claim 1, characterized in that: 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 periphery of the mover fixing sleeve (21). The rotary table (31) is fixedly connected to the mover fixing sleeve (21). The fixed base (41) is fixedly connected to the stator fixing sleeve (11). A first bearing (6) is disposed between the mover fixing sleeve (21) and the stator fixing sleeve (11).

7. The CNC rotary table with a diaphragm spring electromagnetic brake according to claim 1, characterized in that: The rotary table mechanism also includes a central sleeve (32) and an encoder. The encoder includes a scale disk (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 face of the rotary table (31). The other end of the central sleeve (32) extends into the through hole (45) and is provided with the scale disk (33) at the other end. The reading head (34) is opposite to the scale disk (33) and is provided on the fixed base (41).

8. The CNC rotary table with a diaphragm spring electromagnetic brake according to claim 7, characterized in that: It also includes an oil circuit distributor (7), which is located 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 into the interior of the central sleeve (32).

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