Large numerical control rotary table with brake and torque motor integrally arranged

Abstract

The utility model relates to the field of numerical control machine tools, in particular to a brake and torque motor integrated large numerical control rotary table which comprises a stator mechanism, a rotor mechanism, an electromagnetic brake mechanism and a rotary table mechanism, and the electromagnetic brake mechanism comprises a brake disc, an armature, a base, a brake pad assembly, an electromagnet and an elastic assembly. The elastic assembly comprises a plurality of elastic pieces arranged in the electromagnet, the ends, close to the armature, of the elastic pieces make contact with the end, away from the brake disc, of the armature, and the distances between the elastic pieces and the center of the electromagnet are at least partially unequal. Through the arrangement, the elastic pressure of the plurality of elastic pieces on the armature can be distributed at different positions of the large-size armature, so that the whole surface of the large-size armature is stressed uniformly, the armature is prevented from being deformed or warped in the moving process, the brake pad assembly on the armature can be in tight contact with a brake disc, and the service life of the brake pad assembly is prolonged. Therefore, the electromagnetic brake mechanism can instantly provide large enough brake torque for the rotary table mechanism.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tools, and in particular to a large CNC rotary table with an integrated brake and torque motor. 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, slow slippage can easily occur due to the machining pressure of the tool on the workpiece, 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] In existing electromagnetic braking mechanisms, when a sudden power outage occurs, the electromagnetic attraction disappears immediately, and the armature and brake pads can instantly engage with the brake disc under the action of the spring, thus providing braking torque. However, existing electromagnetic braking mechanisms are not suitable for large CNC rotary tables. Because large CNC rotary tables experience a sudden power outage while operating at high speed, the braking mechanism needs to provide a large braking torque instantaneously to achieve emergency braking of the CNC rotary table. In this case, a large-sized electromagnetic braking mechanism is required. However, when the armature diameter is greater than 600mm, the armature will undergo significant deformation and warping under the action of the spring force, which will seriously affect the contact between the brake pad assembly and the brake disc, resulting in poor braking performance.

[0005] Furthermore, because the springs in the braking mechanism will fatigue and deform after a period of use, their elasticity will gradually weaken. Existing CNC rotary table braking mechanisms require stopping the machine to remove the original springs and replace them with new ones before they can be used. This process is time-consuming and labor-intensive, affecting the overall machining efficiency of the CNC machine tool. Moreover, the existing braking mechanism is set up separately from the drive mechanism, which occupies more space and increases 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. Utility Model Content

[0007] In order to overcome the defects and deficiencies in the existing technology, the purpose of this utility model is to design a large CNC rotary table that integrates a brake and a torque motor, which can effectively prevent the deformation and warping of large armatures, and achieve effective contact between the brake pad assembly and the brake disc, thereby ensuring that a sufficiently large braking torque can be provided instantly, and effectively reducing the size of the CNC machine tool.

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

[0009] A large CNC rotary table integrating a brake and torque motor includes a stator mechanism, a mover mechanism, an electromagnetic brake mechanism, and a rotary table mechanism. The mover mechanism is rotatably disposed inside the stator. The rotary table mechanism includes a rotary table fixed to one end of the mover mechanism. The electromagnetic brake mechanism includes a brake disc, an armature, a base, a brake pad assembly, an electromagnet, and an elastic component. The brake disc is fixed to the end of the mover mechanism away from the rotary table. The base is fixed to the end of the stator mechanism away from the rotary table. The electromagnet is fixed to the end of the base near the brake disc. The armature is movably disposed between the electromagnet and the brake disc. The brake pad assembly is disposed at the end of the armature near the brake disc. The brake pad assembly includes an outer ring brake pad disposed on a circumference near the edge of the armature. The elastic component includes multiple elastic elements disposed in the electromagnet. The ends of the multiple elastic elements near the armature are all in contact with the ends of the armature away from the brake disc. The distances between the multiple elastic elements and the center of the electromagnet are at least partially unequal.

[0010] More specifically, the plurality of elastic elements includes several outer ring elastic elements and several inner ring elastic elements. The several outer ring elastic elements are arranged on a circumference near the edge of the electromagnet, and the position of the outer ring elastic elements is opposite to the position of the outer ring brake pad. The several inner ring elastic elements are arranged on a circumference near the center of the electromagnet.

[0011] More specifically, the brake pad assembly further includes an inner ring brake pad, which is disposed on a circumference near the center of the armature, and the position of the inner ring brake pad is opposite to the position of the inner ring elastic member.

[0012] More specifically, each of the outer ring elastic elements is provided with an elasticity adjustment mechanism, the elasticity adjustment mechanism including an adjustment screw threadedly connected to the base, the bottom end of the adjustment screw contacting the end of the outer ring elastic element away from the armature.

[0013] More specifically, the elastic adjustment mechanism further includes a locking nut, which is threaded onto the outside of the adjusting screw.

[0014] More specifically, the CNC rotary table also includes a connecting screw that is detachably connected to the armature, and the middle of the adjusting screw is provided with a through hole for the connecting screw to pass through.

[0015] More specifically, the stator mechanism and the mover mechanism are provided with bearings at their ends away from the base, where they are close to each other. The inner ring of the bearing is fitted onto the mover mechanism, and the outer ring of the bearing is fixed onto the stator mechanism.

[0016] More specifically, the CNC rotary table further includes a circumferential positioning mechanism, which includes a plurality of positioning pins fixed on the electromagnet. The plurality of positioning pins are arranged on a circumference near the edge of the electromagnet. The armature is provided with a positioning hole corresponding to each positioning pin. The positioning pin is inserted into the corresponding positioning hole, and the center of each positioning pin is offset from the center of the corresponding positioning hole. Some of the positioning pins abut against the inner wall of one side of the corresponding positioning hole to prevent the armature from rotating clockwise, and the remaining positioning pins abut against the inner wall of the other side of the corresponding positioning hole to prevent the armature from rotating counterclockwise.

[0017] More specifically, the electromagnet includes a ring-shaped electromagnetic coil disposed near the edge of the electromagnet.

[0018] More specifically, the turntable mechanism also includes a hollow wire sleeve, which is fixed to one end of the turntable near the moving part mechanism. The wire sleeve passes through the moving part mechanism, brake disc, armature, electromagnet, and base in sequence, and extends to the outside of the base. An encoder is fitted on the outside of the end of the wire sleeve near the base.

[0019] The beneficial effects of this utility model are:

[0020] (1) By setting multiple elastic elements in the electromagnetic braking mechanism, and the distance between the multiple elastic elements and the center of the electromagnet is at least partially unequal, it is ensured that during the braking process, when the multiple elastic elements push the large-size armature to move towards the brake disc, the elastic pressure of the multiple elastic elements on the armature can be distributed at different positions of the large-size armature, so that the entire surface of the large-size armature is subjected to relatively uniform force, avoiding deformation or warping of the armature during the movement, and ensuring that the brake pad assembly on the armature can be in close contact with the brake disc, thereby enabling the electromagnetic braking mechanism to provide a sufficiently large braking torque to the turntable mechanism in an instant, and effectively achieving emergency braking of the turntable mechanism in the event of a sudden power failure, thus avoiding the risk of collision.

[0021] (2) By integrating the electromagnetic brake mechanism with the stator and mover mechanisms in the torque motor, space is effectively saved and the size of the CNC machine tool is reduced.

[0022] (3) By setting threaded holes in the base corresponding to each outer ring elastic element, and the threaded holes are connected to the through holes in the electromagnet, the adjusting screw is screwed into the threaded hole from the outside of the base, and the bottom end of the adjusting screw contacts the end of the outer ring elastic element away from the armature. By screwing the adjusting screw to adjust its length in the threaded hole, the compression of the outer ring elastic element can be adjusted. With this setting, when the outer ring elastic element loses elasticity due to fatigue or deformation, the compression and elasticity of the outer ring elastic element can be adjusted by directly screwing the adjusting screw, eliminating the need to stop the machine to replace the new elastic element, saving time and effort, and effectively extending the service life of the electromagnetic brake mechanism.

[0023] (4) By setting the center of each positioning pin off from the center of the corresponding positioning hole, part of the outer wall of each positioning pin abuts against the inner wall of one side of the corresponding positioning hole. Some of the positioning pins are offset counterclockwise relative to the positioning hole, thereby restricting the armature from rotating clockwise. The remaining positioning pins are offset clockwise relative to the positioning hole, thereby restricting the armature from rotating counterclockwise. With this setting, even under the action of processing pressure, the armature will not rotate circumferentially, ensuring that the electromagnetic brake mechanism can fully brake and accurately position the turntable and workpiece during the processing, thus ensuring processing accuracy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the large CNC rotary table of this utility model.

[0025] Figure 2 This is a structural schematic diagram of the large CNC rotary table of this utility model from another angle (without the connecting screw installed).

[0026] Figure 3This is a structural schematic diagram of the large CNC rotary table of this utility model from another angle (with the connecting screw installed).

[0027] Figure 4 This is a schematic diagram of the stator mechanism of this utility model.

[0028] Figure 5 This is a structural schematic diagram of the stator mechanism of this utility model from another angle.

[0029] Figure 6 This is a schematic diagram of the moving part mechanism of this utility model.

[0030] Figure 7 This is a schematic diagram of the structure of the moving part packaging sleeve of this utility model.

[0031] Figure 8 This is an exploded structural diagram of the electromagnetic braking mechanism of this utility model.

[0032] Figure 9 This is a schematic diagram of the armature and positioning pin of this utility model.

[0033] Figure 10 This is a cross-sectional schematic diagram of the large CNC rotary table of this utility model.

[0034] Figure 11 for Figure 9 A schematic diagram of the structure at point A in the middle.

[0035] Figure 12 This is a partial structural cross-sectional view of the large CNC rotary table of this utility model.

[0036] Figure 13 for Figure 11 A schematic diagram of the structure at point B.

[0037] Explanation of reference numerals in the attached figures:

[0038] 11-Stator enclosure sleeve; 111-Limiting protrusion; 12-Stator; 21-Motor enclosure sleeve; 22-Motor; 31-Brake disc; 32-Armature; 321-Threaded connection hole; 33-Base; 34-Electromagnet; 341-Electromagnetic coil; 342-Through hole; 35-Outer ring elastic element; 36-Inner ring elastic element; 37-Outer ring brake pad; 38-Inner ring brake pad; 41-Turntable; 411-Limiting groove; 42-Wire sleeve; 5-Bearing; 61-Adjusting screw; 62-Locking nut; 63-Through hole; 7-Connecting screw; 81-Positioning pin; 82-Positioning hole; 9-Encoder. Detailed Implementation

[0039] 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.

[0040] like Figures 1 to 13 As shown, this utility model provides a large CNC rotary table integrating a brake and a torque motor, including a stator mechanism, a mover mechanism, an electromagnetic brake mechanism, and a rotary table mechanism. The stator mechanism includes a stator enclosure 11, with a stator 12 fixed inside the stator enclosure 11, and the mover mechanism rotatably disposed inside the stator 12. The mover mechanism includes a mover enclosure 21, with a mover 22 fixed outside the mover enclosure 21. The rotary table mechanism includes a rotary table 41, which is fixed to one end of the mover enclosure 21. The electromagnetic brake mechanism includes a brake disc 31, an armature 32, a base 33, a brake pad assembly, an electromagnet 34, and an elastic component. The brake disc 31 is fixed to the end of the mover enclosure 21 away from the rotary table 41. The base 33 is fixed to the stator encapsulation sleeve 11 at the end away from the turntable 41. The electromagnet 34 is fixed to the base 33 at the end near the brake disc 31. The armature 32 is movably disposed between the electromagnet 34 and the brake disc 31. The brake pad assembly is disposed at the end of the armature 32 near the brake disc 31. The brake pad assembly includes an outer ring brake pad 37, which is disposed on a circumference near the edge of the armature 32. The elastic component includes a plurality of elastic elements disposed in the electromagnet 34. The ends of the plurality of elastic elements near the armature 32 are all in contact with the end of the armature 32 away from the brake disc 31. The distances between the plurality of elastic elements and the center of the electromagnet 34 are at least partially unequal. Specifically, multiple through holes 342 are provided in the electromagnet 34, and the distance between the multiple through holes 342 and the center of the electromagnet 34 is at least partially unequal. An elastic element is placed in each through hole 342. The electromagnet 34, armature 32, and brake disc 31 are all circular, and the diameter of the armature 32 is greater than 600mm. Since the braking torque output by the electromagnetic brake mechanism is proportional to the sum of the outer diameter and inner diameter of the brake pad assembly under rotational braking, the brake pad assembly is set as annular and is located as close as possible to the edge of the armature 32 on a circumference.

[0041] In actual use, when the electromagnet 34 is energized, an attractive force is generated between the electromagnet 34 and the armature 32. The attractive force is greater than the elastic pressure generated by the multiple elastic elements on the armature 32. The armature 32 is held on the end face of the electromagnet 34, and the multiple elastic elements are in a compressed state, thereby causing the brake pad assembly on the armature 32 to separate from the brake disc 31. At this time, the mover mechanism rotates relative to the stator mechanism, and the turntable mechanism rotates synchronously with the mover mechanism. When the electromagnet 34 is de-energized, the attractive force of the electromagnet 34 on the armature 32 disappears instantly, and the multiple elastic elements recover. Under the elastic pressure of the multiple elastic elements, the armature 32 moves instantaneously to the end face of the brake disc 31. Since the armature 32 is relatively large, if the elastic pressure applied by the multiple elastic elements to the armature 32 is unevenly distributed, it is easy for the armature 32 to deform and warp during the movement. Therefore, the distance between the multiple elastic elements and the center of the electromagnet 34 is set to be at least partially unequal, that is, the multiple elastic elements are not distributed on the same circumference. For example, some elastic elements are distributed near the edge of the electromagnet 34. Some elastic elements are distributed near the center of the electromagnet 34. This arrangement allows the elastic pressure of multiple elastic elements on the armature 32 to be distributed at different positions of the armature 32 when the armature 32 is pushed towards the brake disc 31. This makes the entire surface of the armature 32 more evenly stressed, preventing deformation or warping of the armature 32 during movement. It ensures that the armature 32 can be in a relatively flat state against the end face of the brake disc 31, allowing the brake pad assembly on the armature 32 to be in close contact with the brake disc 31. This enables the electromagnetic braking mechanism to provide a sufficiently large braking torque to the turntable mechanism instantly.

[0042] In this embodiment, on the one hand, by setting multiple elastic elements in the electromagnetic braking mechanism, and the distance between the multiple elastic elements and the center of the electromagnet 34 is at least partially unequal, it is ensured that during the braking process, when the multiple elastic elements push the large-size armature 32 to move towards the brake disc 31, the elastic pressure of the multiple elastic elements on the armature 32 can be distributed at different positions of the large-size armature 32, so that the entire surface of the large-size armature 32 is subjected to relatively uniform force, avoiding deformation or warping of the armature 32 during movement, and ensuring that the brake pad assembly on the armature 32 can be in close contact with the brake disc 31, thereby enabling the electromagnetic braking mechanism to provide a sufficiently large braking torque to the turntable mechanism instantly, and effectively realizing emergency braking of the turntable mechanism in the event of a sudden power failure, avoiding the risk of machine collision; on the other hand, by integrating the electromagnetic braking mechanism with the stator mechanism and mover mechanism in the torque motor, space is effectively saved and the volume of the CNC machine tool is reduced.

[0043] Furthermore, such as Figure 8 , 10As shown, the plurality of elastic elements specifically includes several outer ring elastic elements 35 and several inner ring elastic elements 36. The several outer ring elastic elements 35 are disposed on a circumference near the edge of the electromagnet 34, and the positions of the outer ring elastic elements 35 are opposite to the positions of the outer ring brake pads 37. The several inner ring elastic elements 36 are disposed on a circumference near the center of the electromagnet 34. Preferably, both the outer ring elastic elements and the inner ring elastic elements are compression springs. In this embodiment, an outer ring elastic element 35 is provided on the electromagnet 34 at a position opposite to the outer ring brake pad 37. During braking, the outer ring elastic element 35 applies elastic pressure to the outer ring of the armature 32. On the one hand, this elastic pressure drives the armature 32 to move towards the brake disc 31. On the other hand, when the armature 32 abuts against the end face of the brake disc 31, the pressure applied by the outer ring elastic element 35 is exactly at the position of the outer ring brake pad 37. The outer ring elastic element 35 can press the outer ring brake pad 37 tightly against the end face of the brake disc 31, thereby enabling the electromagnetic braking mechanism to provide a sufficiently large braking torque to the turntable mechanism instantaneously. If only the outer ring elastic element 35 is provided, the elastic pressure of the outer ring elastic element 35 on the armature 32 will be concentrated at the edge of the armature 32. Since the overall size of the armature 32 is large, the force on the armature 32 will be very uneven, which will cause the armature 32 to deform or warp, especially at the edge. This will prevent the outer ring brake pad 37 located at the edge of the armature 32 from fitting tightly with the brake disc 31, affecting the braking effect. Therefore, in this embodiment, several inner ring elastic elements 36 are also provided on a circumference near the center of the electromagnet 34. During the braking process, the inner ring elastic elements 36 simultaneously apply elastic pressure to the inner ring of the armature 32, so that as the armature 32 moves towards the brake disc 31, both the outer and inner rings are subjected to elastic pressure, ensuring that the large-sized armature 32 is subjected to relatively uniform force and avoiding deformation or warping of the armature 32.

[0044] In other embodiments, different arrangements can be used to set the specific positions of multiple elastic elements, as long as the elastic pressure of multiple elastic elements on the armature 32 can be distributed at different positions of the large-size armature 32, so that the entire surface of the large-size armature 32 is subjected to uniform force.

[0045] Furthermore, such as Figure 8As shown, the brake pad assembly also includes an inner ring brake pad 38, which is disposed on a circumference near the center of the armature 32, and the position of the inner ring brake pad 38 is opposite to the position of the inner ring elastic member 36. When the armature 32 abuts against the end face of the brake disc 31, the elastic pressure applied by the outer ring elastic member 35 is exactly located at the position of the outer ring brake pad 37, that is, the outer ring brake pad 37 also plays the role of supporting the outer ring position of the armature 32 to bear the elastic pressure of the outer ring elastic member 35. At the same time, the inner ring elastic member 36 also applies elastic pressure to the inner ring position of the armature 32. If there is no component supporting the armature 32 at the inner ring position, the inner ring of the armature 32 will deform due to the elastic pressure of the inner ring elastic member 36. Therefore, in this embodiment, an inner ring brake pad 38 is also provided at the position opposite to the inner ring elastic member 36 in the armature 32. The elastic pressure applied by the elastic element 36 is located precisely at the position of the inner ring brake pad 38. On the one hand, the inner ring brake pad 38 supports the inner ring position of the armature 32 to bear the elastic pressure of the inner ring elastic element 36, preventing the armature 32 from deforming at the inner ring position due to the elastic pressure applied by the inner ring elastic element 36. On the other hand, the elastic pressure applied by the inner ring elastic element 36 presses the inner ring brake pad 38 against the end face of the brake disc 31, making the inner ring brake pad 38 and the brake disc 31 in close contact, thereby enabling the inner ring brake pad 38 to play an auxiliary braking function and further increase the braking torque output by the electromagnetic brake mechanism.

[0046] Preferably, the diameter of the outer ring elastic element 35 is larger than the diameter of the inner ring elastic element 36. Since the output of braking torque mainly relies on the friction between the outer ring brake pad 38 and the brake disc 31, while the inner ring brake pad 38 only plays an auxiliary braking role, the outer ring elastic element 35 uses a spring with a large diameter to ensure that sufficient elastic pressure is applied to the outer ring brake pad 38 to press it against the brake disc 31, thereby ensuring the friction between the outer ring brake pad 38 and the brake disc 31; while the inner ring elastic element 36 uses a spring with a small diameter. The inner ring elastic element 36 minimizes its size while ensuring that sufficient elastic pressure is applied to the inner ring brake pad 38 to achieve auxiliary braking, thereby effectively reducing the size of the entire electromagnetic braking mechanism.

[0047] Furthermore, such as Figure 10-11As shown, each of the outer ring elastic elements 35 is provided with an elasticity adjustment mechanism. The elasticity adjustment mechanism includes an adjustment screw 61 that is threadedly connected to the base 33. The bottom end of the adjustment screw 61 contacts the end of the outer ring elastic element 35 away from the armature 32. Because the elastic elements in the braking mechanism will fatigue and deform after a period of use, their elasticity will gradually weaken, especially for the outer ring elastic element 35, which plays a major braking role. Therefore, in this embodiment, threaded holes are provided in the base 33 for each outer ring elastic element 35, and the threaded holes are connected to the through holes 342 in the electromagnet 34. The adjusting screw 61 is screwed into the threaded hole from the outside of the base 33, and the bottom end of the adjusting screw 61 contacts the end of the outer ring elastic element 35 away from the armature 32. By turning the adjusting screw 61 to adjust its length in the threaded hole, the compression of the outer ring elastic element 35 can be adjusted. With this setting, when the outer ring elastic element 35 weakens due to fatigue or deformation, the compression and elasticity of the outer ring elastic element 35 can be adjusted by directly turning the adjusting screw 61, eliminating the need to stop and replace the elastic element, saving time and effort, and effectively extending the service life of the electromagnetic braking mechanism.

[0048] Furthermore, such as Figure 10-11 As shown, the elastic adjustment mechanism also includes a locking nut 62, which is threaded onto the outside of the adjusting screw 61. In this embodiment, by providing a locking nut 62 on the outside of the adjusting screw 61, the loosening of the adjusting screw 61 during use is effectively prevented, ensuring the compression and elasticity of the outer ring elastic element 35.

[0049] Furthermore, such as Figure 8 and 9As shown, the CNC rotary table also includes a circumferential positioning mechanism, which includes a plurality of positioning pins 81 fixed on the electromagnet 34. The plurality of positioning pins 81 are arranged on a circumference near the edge of the electromagnet 34. The armature 32 is provided with a positioning hole 82 corresponding to each positioning pin 81. The positioning pin 81 can be inserted into the corresponding positioning hole 82, and the center of each positioning pin 81 is offset from the center of the corresponding positioning hole 82. Some of the positioning pins 81 are set against one side of the inner wall of the corresponding positioning hole 82 to prevent the armature 32 from rotating clockwise, and the remaining positioning pins 81 are set against the other side of the inner wall of the corresponding positioning hole 82 to prevent the armature 32 from rotating counterclockwise. In this embodiment, several positioning pins 81 are used to guide the movement direction of the armature 32, preventing the armature 32 from rotating circumferentially during movement. Furthermore, during workpiece machining, the turntable 41 needs to be stationary to precisely hold the workpiece in a certain position for machining. At this time, an electromagnetic braking mechanism is required to keep the turntable 41 stationary. However, during machining, the machining tool exerts significant machining pressure on the workpiece. Because there is a certain clearance between the positioning pins 81 and the positioning holes 82, the armature 32 may rotate slightly circumferentially under the machining pressure, meaning that the turntable cannot be fully braked and precisely positioned, thus affecting the workpiece's positional accuracy and machining accuracy. Therefore, in this embodiment, the center of each positioning pin 81 is offset from the phase... The positioning hole 82 is centered. Specifically, four positioning pins 81 are evenly arranged on the electromagnet. The centers of the four positioning pins 81 are offset relative to the center of the positioning hole 82, so that part of the outer wall of each positioning pin 81 abuts against the inner wall of one side of the corresponding positioning hole 82. Two of the positioning pins 81 are offset counterclockwise relative to the positioning hole 82, which can restrict the armature 32 from rotating clockwise. The remaining two positioning pins 81 are offset clockwise relative to the positioning hole 82, which can restrict the armature 32 from rotating counterclockwise. This arrangement ensures that even under processing pressure, the armature 32 will not rotate circumferentially, thus ensuring complete braking and precise positioning of the turntable 41 and the workpiece during processing and guaranteeing processing accuracy.

[0050] Furthermore, such as Figure 10-11As shown, the CNC rotary table also includes a connecting screw 7 detachably connected to the armature 32, and the middle of the adjusting screw 61 is provided with a through hole 63 for the connecting screw 7 to pass through. Specifically, the armature 32 is provided with a threaded connection hole 321 corresponding to the position of each adjusting screw 61. When disassembling and assembling the CNC rotary table, the electromagnet 34 needs to be de-energized. At this time, due to the elastic element, the armature 32 cannot be connected to the electromagnet 34. Without the armature 32's obstruction, the elastic element may fall out of the through hole 342, making it inconvenient to disassemble and assemble the electromagnetic brake mechanism (excluding the brake disc 31). Therefore, in this embodiment, a connecting screw 7 that can be detachably connected to the armature is provided. When assembling the CNC rotary table, the connecting screw 7 is threaded through the through hole 63 in the middle of the adjusting screw 61 and threaded into the threaded connection hole 321 in the armature 32. The connecting screw 7 can overcome the elastic pressure of multiple elastic elements and assemble the armature 32 and electromagnet 34 together. With the armature 32's obstruction, multiple elastic elements will not fall out of the electromagnet 34, thus forming the electromagnetic brake mechanism (excluding the brake disc 31) into a whole. After assembly, the entire assembly can be completed. The electromagnetic brake mechanism (excluding brake disc 31) is assembled with the torque motor, making the overall assembly of the CNC rotary table more convenient and ensuring accurate installation of the armature 32 and each elastic component. After installation, since the electromagnet 34, brake disc 31, and positioning pin 81 position the armature 32, the connecting screw 7 can be removed to prevent it from affecting the movement of the armature 32 during braking. When the CNC rotary table needs to be disassembled for maintenance of the torque motor, the electromagnet 34 is de-energized. The connecting screw 73 is then reconnected to the armature 32, allowing the electromagnetic brake mechanism (excluding brake disc 31) to be reassembled as a whole. This allows for direct disassembly of the integrated electromagnetic brake mechanism, followed by maintenance of the torque motor. After maintenance, the integrated electromagnetic brake mechanism can be directly installed on the torque motor. Therefore, by using the connecting screw 7, the assembly and disassembly of the CNC rotary table becomes convenient, quick, and time-saving.

[0051] Furthermore, such as Figure 12 As shown, bearings 5 ​​are provided at the ends of the stator sleeve 11 and the mover sleeve 21 away from the base 33, at positions close to each other. The inner ring of the bearing 5 is fitted onto the mover sleeve 21, and the outer ring of the bearing 5 is fixed onto the stator sleeve 11. In this embodiment, by providing bearings 5, the friction between the stator mechanism and the mover mechanism during rotation is effectively reduced.

[0052] Furthermore, such as Figure 4 , 12As shown in Figure -13, the stator enclosure sleeve 11 has several limiting protrusions 111 on one end face near the turntable 41, and several limiting grooves 411 that cooperate with the limiting protrusions 111 are provided at the edge of the turntable. In this embodiment, by setting the limiting protrusions 111 and the limiting grooves 411, the movement direction of the turntable 41 is effectively guaranteed.

[0053] Furthermore, such as Figure 10 As shown, the electromagnet 34 includes a ring-shaped electromagnetic coil 341, which is disposed near the edge of the electromagnet 34. Specifically, the outer side of the electromagnetic coil 341 is disposed close to the inner side of the through hole 342, so that the electromagnetic coil 341 is disposed as close as possible to the edge of the electromagnet 34. Since the magnetic force of the electromagnet has a centripetal effect, and the electromagnetic braking mechanism in this embodiment is relatively large, if the magnetic force is concentrated at the center, the electromagnet 34 may not be able to attract the large armature 32. Therefore, in this embodiment, the electromagnetic coil is disposed as close as possible to the edge of the electromagnet 34, thereby increasing the magnetic force on the outer side of the electromagnet and correspondingly weakening the magnetic force at the center, so as to match the elastic pressure of the outer ring elastic element 35 and the inner ring elastic element 36, and ensure reliable attraction of the armature 32.

[0054] Furthermore, such as Figure 10 and 12 As shown, the turntable mechanism also includes a hollow wire sleeve 42. The wire sleeve 42 is fixed to one end of the turntable 41 near the mover enclosure 21. The wire sleeve 42 passes sequentially through the mover enclosure 21, brake disc 31, armature 32, electromagnet 34, and base 33, and extends to the outside of the base 33. An encoder 9 is fitted onto the outer side of the end of the wire sleeve 42 near the base 33. In this embodiment, by setting a hollow wire sleeve 42, it is convenient for the wire to pass through the middle and extend to the outside of the turntable 41. Since the wire sleeve 42 rotates with the turntable 41, placing the encoder 9 in the wire sleeve 42 can accurately measure the rotation angle of the turntable 41, and also makes the overall structure of the CNC turntable more compact.

[0055] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A large CNC rotary table integrating a brake and a torque motor, comprising a stator mechanism, a mover mechanism, an electromagnetic brake mechanism, and a rotary table mechanism, characterized in that: The moving part mechanism is rotatably disposed inside the stator mechanism; the turntable mechanism includes a turntable (41), which is fixed at one end of the moving part mechanism; The electromagnetic braking mechanism includes a brake disc (31), an armature (32), a base (33), a brake pad assembly, an electromagnet (34), and an elastic component. The brake disc (31) is fixed at the end of the moving part of the mechanism away from the turntable (41), the base (33) is fixed at the end of the stator of the mechanism away from the turntable (41), the electromagnet (34) is fixed at the end of the base (33) near the brake disc (31), and the armature (32) is movably disposed between the electromagnet (34) and the brake disc (31). (32) The brake pad assembly is provided at one end near the brake disc (31). The brake pad assembly includes an outer ring brake pad (37). The outer ring brake pad (37) is disposed on a circumference near the edge of the armature (32). The elastic component includes a plurality of elastic elements disposed in the electromagnet (34). The ends of the plurality of elastic elements near the armature (32) are in contact with the end of the armature (32) away from the brake disc (31). The distance between the plurality of elastic elements and the center of the electromagnet (34) is at least partially unequal.

2. The large CNC rotary table with integrated brake and torque motor as described in claim 1, characterized in that: The plurality of elastic elements include a plurality of outer ring elastic elements (35) and a plurality of inner ring elastic elements (36). The plurality of outer ring elastic elements (35) are disposed on a circumference near the edge of the electromagnet (34), and the position of the outer ring elastic elements (35) is opposite to the position of the outer ring brake pad (37). The plurality of inner ring elastic elements (36) are disposed on a circumference near the center of the electromagnet (34).

3. The large CNC rotary table with integrated brake and torque motor as described in claim 2, characterized in that: The brake pad assembly also includes an inner ring brake pad (38), which is disposed on a circumference near the center of the armature (32), and the position of the inner ring brake pad (38) is opposite to the position of the inner ring elastic member (36).

4. The large CNC rotary table with integrated brake and torque motor as described in claim 2, characterized in that: Each of the outer ring elastic elements (35) is provided with an elasticity adjustment mechanism, which includes an adjustment screw (61) threadedly connected to the base (33). The bottom end of the adjustment screw (61) contacts the end of the outer ring elastic element (35) away from the armature (32).

5. The large CNC rotary table with integrated brake and torque motor as described in claim 4, characterized in that: The elastic adjustment mechanism also includes a locking nut (62), which is threaded to the outside of the adjusting screw (61).

6. The large CNC rotary table with integrated brake and torque motor as described in claim 4, characterized in that: The CNC rotary table also includes a connecting screw (7) detachably connected to the armature (32), and the middle part of the adjusting screw (61) is provided with a through hole (63) for the connecting screw (7) to pass through.

7. The large CNC rotary table with integrated brake and torque motor as described in claim 1, characterized in that: The stator mechanism and the mover mechanism are provided with a bearing (5) at the end away from the base (33) where they are close to each other. The inner ring of the bearing (5) is sleeved on the mover mechanism, and the outer ring of the bearing (5) is fixed on the stator mechanism.

8. The large CNC rotary table with integrated brake and torque motor as described in claim 1, characterized in that: The CNC rotary table also includes a circumferential positioning mechanism, which includes a plurality of positioning pins (81) fixed on the electromagnet (34). The plurality of positioning pins (81) are arranged on a circumference near the edge of the electromagnet (34). The armature (32) is provided with positioning holes (82) corresponding to each positioning pin (81). The positioning pins (81) are inserted into the corresponding positioning holes (82), and the center of each positioning pin (81) is offset from the center of the corresponding positioning hole (82). A portion of the positioning pins (81) abut against one side of the inner wall of the corresponding positioning hole (82) to prevent the armature (32) from rotating clockwise, and the remaining positioning pins (81) abut against the other side of the inner wall of the corresponding positioning hole (82) to prevent the armature (32) from rotating counterclockwise.

9. The large CNC rotary table with integrated brake and torque motor as described in claim 1, characterized in that: The electromagnet (34) includes a ring-shaped electromagnetic coil (341) disposed near the edge of the electromagnet (34).

10. The large CNC rotary table with integrated brake and torque motor as described in claim 1, characterized in that: The turntable mechanism also includes a hollow wire sleeve (42), which is fixed to one end of the turntable (41) near the moving part mechanism. The wire sleeve (42) passes through the moving part mechanism, brake disc (31), armature (32), electromagnet (34), and base (33) in sequence, and extends to the outside of the base (33). An encoder (9) is sleeved on the outside of the end of the wire sleeve (42) near the base (33).

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