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

Abstract

The invention 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] The invention relates to the field of numerical control machine tools, and in particular to a large numerical control turntable with integrated brake and torque motor. Background Art

[0002] The CNC turntable is the 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 turntable generally adopts a torque motor drive mechanism to drive the CNC turntable 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 turntable in an emergency situation of sudden power failure, so that the CNC turntable is at risk of collision, causing serious losses; therefore, it is often necessary to set a set of braking mechanisms in the CNC turntable to brake the CNC turntable to ensure precise positioning requirements and ensure emergency braking in the event of power failure.

[0003] At present, the common brake mechanism on CNC turntables 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 part 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 part, 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] In the existing electromagnetic brake mechanism, when there is a sudden power outage, the electromagnetic attraction disappears immediately, and the armature and brake pad can instantly fit with the brake disc under the action of the spring to provide braking torque; however, the existing electromagnetic brake mechanism is not suitable for large CNC turntables. Since large CNC turntables suddenly lose power when running at high speed, the brake mechanism is required to provide a large braking torque in an instant to achieve emergency braking of the CNC turntable. At this time, a large-sized electromagnetic brake mechanism needs to be set accordingly. However, when the armature diameter is greater than 600mm, the armature will undergo obvious deformation and warping under the action of elastic force, which will seriously affect the contact between the brake pad assembly and the brake disc, resulting in poor braking effect.

[0005] Furthermore, since the spring in the brake mechanism will fatigue and deform after a period of use, its elasticity will gradually weaken. The existing CNC turntable brake mechanism needs to be shut down to remove the original spring and replace it with a new spring before it can be used. This process is time-consuming and labor-intensive, affecting the processing efficiency of the entire CNC machine tool. In addition, the existing brake mechanism is independently set up separately from the drive mechanism, which will take 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 large-scale CNC turntable with an integrated brake and torque motor, which can effectively prevent the deformation and warping of the large-size armature, 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 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 large-scale CNC turntable with integrated brake and torque motor, comprising a stator mechanism, a mover mechanism, an electromagnetic brake mechanism and a turntable mechanism, wherein the stator mechanism comprises a stator packaging sleeve, a stator is fixed on the inner side of the stator packaging sleeve, and the mover mechanism is rotatably arranged inside the stator; the mover mechanism comprises a mover packaging sleeve, a mover is fixed on the outer side of the mover packaging sleeve; the turntable mechanism comprises a turntable, and the turntable is fixed at one end of the mover packaging sleeve; the electromagnetic brake mechanism comprises a brake disc, an armature, a base, a brake pad assembly, an electromagnet and an elastic assembly, the brake disc is fixed on the end of the mover packaging sleeve away from the turntable, the base The stator is fixed at one end of the stator packaging sleeve away from the turntable, the electromagnet is fixed at one end of the base close to the brake disc, the armature is movably arranged between the electromagnet and the brake disc, the brake pad assembly is arranged at one end of the armature close to the brake disc, the brake pad assembly includes an outer ring brake pad, and the outer ring brake pad is arranged on a circumference close to the edge of the armature, the elastic component includes a plurality of elastic members arranged in the electromagnet, the ends of the plurality of elastic members close to the armature are all in contact with the end of the armature away from the brake disc, and the spacing between the plurality of elastic members and the center of the electromagnet is at least partially unequal.

[0010] More specifically, the plurality of elastic parts include a plurality of outer ring elastic parts and a plurality of inner ring elastic parts, the plurality of outer ring elastic parts are arranged on a circumference close to the edge of the electromagnet, and the position of the outer ring elastic parts is opposite to the position of the outer ring brake pad, and the plurality of inner ring elastic parts are arranged on a circumference close to the center of the electromagnet.

[0011] More specifically, the brake pad assembly further includes an inner ring brake pad, which is arranged on a circumference close to 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 members is provided with an elastic force adjustment mechanism, and the elastic force adjustment mechanism comprises an adjustment screw threadedly connected to the base, and the bottom end of the adjustment screw contacts an end of the outer ring elastic member away from the armature.

[0013] More specifically, the elastic force adjustment mechanism further includes a locking nut, and the locking nut is threadedly connected to the outer side of the adjusting screw.

[0014] More specifically, the numerically controlled turntable further comprises a connecting screw detachably connected to the armature, and a through hole for the connecting screw to pass through is arranged in the middle of the adjusting screw.

[0015] More specifically, a bearing is provided at a position where the stator encapsulation sleeve and the mover encapsulation sleeve are close to each other at one end away from the base, the inner ring of the bearing is sleeved on the mover encapsulation sleeve, and the outer ring of the bearing is fixed on the stator encapsulation sleeve.

[0016] More specifically, the CNC turntable also includes a circumferential positioning mechanism, which includes a plurality of positioning pins fixed on the electromagnet, wherein the plurality of positioning pins are arranged on a circumference close to the edge of the electromagnet, and a positioning hole is provided on the armature corresponding to each of the positioning pins, the positioning pins are inserted into the corresponding positioning holes, and the center of each positioning pin is set offset from the center of the corresponding positioning hole, wherein a part of the positioning pins are set against the inner wall on one side of the corresponding positioning hole to prevent the armature from rotating clockwise, and the remaining positioning pins are set against the inner wall on the other side of the corresponding positioning hole to prevent the armature from rotating counterclockwise.

[0017] More specifically, the electromagnet includes an annular electromagnetic coil, and the annular electromagnetic coil is arranged at a position close to 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 close to the mover packaging sleeve. The wire sleeve passes through the mover packaging sleeve, brake disc, armature, electromagnet, and base in sequence and extends to the outside of the base. An encoder is provided on the outside of one end of the wire sleeve close to the base.

[0019] Beneficial effects of the present invention:

[0020] (1) By arranging a plurality of elastic members in the electromagnetic brake mechanism, and the spacing between the plurality of elastic members and the center of the electromagnet is at least partially unequal, it is ensured that during the braking process, when the plurality of elastic members push the large-sized armature to move toward the brake disc, the elastic pressure of the plurality of elastic members on the armature can be distributed at different positions of the large-sized armature, so that the entire surface of the large-sized armature is subjected to a relatively uniform force, thereby preventing the armature from deforming or warping during the movement, and ensuring that the brake pad assembly on the armature can be in close contact with the brake disc, so that the electromagnetic brake mechanism can instantly provide a sufficiently large braking torque for the turntable mechanism, and can effectively realize the emergency braking of the turntable mechanism in an emergency situation of sudden power failure, thereby avoiding the occurrence of the risk of collision;

[0021] (2) By integrating the electromagnetic brake mechanism with the stator mechanism and the mover mechanism in the torque motor, space can be effectively saved and the volume of the CNC machine tool can be reduced;

[0022] (3) A threaded hole is set in the base corresponding to each outer ring elastic part, and the threaded hole is connected with the through hole 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 part away from the armature. By screwing the adjusting screw to adjust the length of the outer ring elastic part inserted into the threaded hole, the compression amount of the outer ring elastic part can be adjusted. With such a configuration, when the elasticity of the outer ring elastic part is weakened due to fatigue or deformation, the compression amount and elasticity of the outer ring elastic part can be adjusted by directly screwing the adjusting screw, which saves the process of stopping the machine to replace a new elastic part, saves time and effort, and effectively extends the service life of the electromagnetic brake mechanism.

[0023] (4) By setting the center of each locating pin offset from the center of the corresponding locating hole, a portion of the outer wall of each locating pin is pressed against the inner wall of one side of the corresponding locating hole, wherein some of the locating pins are offset in the counterclockwise direction relative to the locating hole, thereby limiting the armature from rotating clockwise, and the remaining locating pins are offset in the clockwise direction relative to the locating hole, thereby limiting the armature from rotating counterclockwise. With this arrangement, even if there is a processing pressure, the armature will not rotate circumferentially, ensuring that the electromagnetic brake mechanism can completely brake and accurately position the turntable and the workpiece during the processing, thereby ensuring the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the large-scale numerical control turntable of the present invention.

[0025] Figure 2 It is a schematic structural diagram of the large-scale CNC turntable of the present invention from another angle (without the connecting screw installed).

[0026] Figure 3 It is a structural schematic diagram of the large-scale CNC turntable of the present invention from another angle (with connecting screws installed).

[0027] Figure 4 It is a structural schematic diagram of the stator mechanism of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the stator mechanism of the present invention from another angle.

[0029] Figure 6 It is a structural schematic diagram of the mover mechanism of the present invention.

[0030] Figure 7 It is a schematic structural diagram of the mover packaging sleeve of the present invention.

[0031] Figure 8 It is a schematic diagram of the exploded structure of the electromagnetic brake mechanism of the present invention.

[0032] Fig. 9 It is a schematic structural diagram of the armature and the positioning pin of the present invention.

[0033] Fig.10 It is a cross-sectional schematic diagram of the large-scale CNC turntable of the present invention.

[0034] Fig.11 for Fig.10 Schematic diagram of the structure at A in the middle.

[0035] Fig.12 It is a partial structural cross-sectional schematic diagram of the large-scale CNC turntable of the present invention.

[0036] Fig.13 for Fig.12 Schematic diagram of the structure at B in the figure.

[0037] Description of reference numerals:

[0038] 11- stator encapsulation sleeve; 111- limiting protrusion; 12-stator; 21-mator encapsulation sleeve; 22-mator; 31-brake disc; 32-armature; 321-threaded connection hole; 33-base; 34-electromagnet; 341-electromagnetic coil; 342-through hole; 35-outer ring elastic part; 36-inner ring elastic part; 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-locating pin; 82-locating hole; 9-encoder. DETAILED DESCRIPTION

[0039] 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.

[0040] like Figures 1 to 13As shown, the present invention provides a large-scale CNC turntable with an integrated brake and torque motor, including a stator mechanism, a mover mechanism, an electromagnetic brake mechanism and a turntable mechanism, wherein the stator mechanism includes a stator packaging sleeve 11, a stator 12 is fixed to the inner side of the stator packaging sleeve 11, and the mover mechanism is rotatably arranged inside the stator 12; the mover mechanism includes a mover packaging sleeve 21, a mover 22 is fixed to the outer side of the mover packaging sleeve 21; the turntable mechanism includes a turntable 41, and the turntable 41 is fixed to one end of the mover packaging sleeve 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 assembly, the brake disc 31 is fixed to the end of the mover packaging sleeve 21 away from the turntable 41, and the The base 33 is fixed to an end of the stator packaging sleeve 11 away from the turntable 41, the electromagnet 34 is fixed to an end of the base 33 close to the brake disc 31, the armature 32 is movably arranged between the electromagnet 34 and the brake disc 31, the brake pad assembly is arranged at the end of the armature 32 close to the brake disc 31, the brake pad assembly includes an outer ring brake pad 37, and the outer ring brake pad 37 is arranged on a circumference close to the edge of the armature 32, the elastic component includes a plurality of elastic members arranged in the electromagnet 34, the ends of the plurality of elastic members close to the armature 32 are in contact with the end of the armature 32 away from the brake disc 31, and the spacing between the plurality of elastic members and the center of the electromagnet 34 is at least partially unequal. Specifically, a plurality of through holes 342 are provided in the electromagnet 34, and the spacings between the plurality of through holes 342 and the center of the electromagnet 34 are at least partially unequal, and an elastic member is placed in each through hole 342; the electromagnet 34, the armature 32, and the brake disc 31 are all configured in a circular shape, and the diameter of the armature 32 is greater than 600 mm; because in the case of rotational braking, the magnitude of the braking torque output by the electromagnetic brake mechanism is proportional to the sum of the outer diameter and the inner diameter of the brake pad assembly, therefore, the brake pad assembly is configured in a circular shape, and is disposed as close to a circumference as possible on the edge of the armature 32.

[0041] In actual use, when the electromagnet 34 is energized, an attractive force is generated between the electromagnet 34 and the armature 32, and the attractive force is greater than the elastic pressure exerted on the armature 32 by the multiple elastic parts. The armature 32 is held on the end face of the electromagnet 34, and the multiple elastic parts are in a compressed state, thereby separating the brake pad assembly on the armature 32 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 powered off, the attraction of the electromagnet 34 to the armature 32 disappears instantly, and the multiple elastic parts are restored. Under the action of the elastic pressure of the multiple elastic parts, the armature 32 moves instantly to the end surface of the brake disc 31. Since the size of the armature 32 is large, if the elastic pressure applied to the armature 32 by the multiple elastic parts is unevenly distributed, it is easy to cause the armature 32 to deform and warp during the movement. Therefore, the spacing between the multiple elastic parts and the center of the electromagnet 34 is set to be at least partially unequal, that is, the multiple elastic parts are not distributed on the same circumference. For example, some elastic parts are distributed near the edge of the electromagnet 34. Some elastic parts are distributed at positions close to the center of the electromagnet 34. This arrangement allows multiple elastic parts to push the armature 32 to move toward the brake disc 31. The elastic pressure of the multiple elastic parts on the armature 32 can be distributed at different positions of the armature 32, so that the entire surface of the armature 32 is subjected to a relatively uniform force, thereby preventing the armature 32 from deforming or warping during the movement, ensuring that the armature 32 as a whole can be in a relatively flat state and rest against the end face of the brake disc 31, so that the brake pad assembly on the armature 32 can be in close contact with the brake disc 31, thereby enabling the electromagnetic brake mechanism to provide a sufficiently large braking torque for the turntable mechanism in an instant.

[0042] In this embodiment, on the one hand, by arranging a plurality of elastic parts in the electromagnetic brake mechanism, and the spacings between the plurality of elastic parts and the center of the electromagnet 34 are at least partially unequal, it is ensured that during the braking process, when the plurality of elastic parts push the large-sized armature 32 to move toward the brake disc 31, the elastic pressure of the plurality of elastic parts on the armature 32 can be distributed at different positions of the large-sized armature 32, so that the entire surface of the large-sized armature 32 is subjected to force relatively evenly, thereby 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, so that the electromagnetic brake mechanism can instantly provide a sufficiently large braking torque for the turntable mechanism, and can effectively realize the emergency braking of the turntable mechanism in an emergency situation of sudden power failure, thereby avoiding the risk of collision; on the other hand, by integrating the electromagnetic brake mechanism with the stator mechanism and the mover mechanism in the torque motor, space can be effectively saved and the volume of the CNC machine tool can be reduced.

[0043] Furthermore, if Figure 8 , 10As shown, the plurality of elastic members specifically include a plurality of outer ring elastic members 35 and a plurality of inner ring elastic members 36, wherein the plurality of outer ring elastic members 35 are arranged on a circumference close to the edge of the electromagnet 34, and the position of the outer ring elastic member 35 is opposite to the position of the outer ring brake pad 37, and the plurality of inner ring elastic members 36 are arranged on a circumference close to the center of the electromagnet 34. Preferably, both the outer ring elastic member and the inner ring elastic member are compression springs. In this embodiment, an outer ring elastic member 35 is provided on the electromagnet 34 at a position opposite to the outer ring brake pad 37. During the braking process, the outer ring elastic member 35 applies elastic pressure to the outer ring of the armature 32. On the one hand, the elastic pressure drives the armature 32 to move toward 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 member 35 is just located at the position of the outer ring brake pad 37. The outer ring elastic member 35 can just press the outer ring brake pad 37 tightly against the end face of the brake disc 31, thereby realizing that the electromagnetic brake mechanism can instantly provide a sufficiently large braking torque for the turntable mechanism. If only the outer ring elastic member 35 is provided, the elastic pressure of the outer ring elastic member 35 on the armature 32 is concentrated at the edge position of the armature 32. Since the overall size of the armature 32 is relatively large, the overall force on the armature 32 will be very uneven, thereby causing the armature 32 to deform or warp, especially deformation at the edge position. This will cause the outer ring brake pad 37 located at the edge position of the armature 32 to be unable to fit tightly with the brake disc 31, affecting the braking effect; therefore, in the present embodiment, a plurality of inner ring elastic members 36 are also provided on a circumference close to the center of the electromagnet 34. During the braking process, the inner ring elastic member 36 simultaneously applies elastic pressure to the inner ring of the armature 32, so that when the armature 32 moves toward the brake disc 31, both the outer ring position and the inner ring position are subjected to the elastic pressure, thereby ensuring that the overall force on the large-sized armature 32 is relatively uniform, and avoiding deformation or warping of the armature 32.

[0044] In other embodiments, different arrangements may be used to set the specific positions of the multiple elastic members, as long as the technical effect of distributing the elastic pressure of the multiple elastic members on the armature 32 at different positions of the large-sized armature 32 and making the entire surface of the large-sized armature 32 evenly stressed can be achieved.

[0045] Furthermore, if Figure 8As shown, the brake pad assembly also includes an inner ring brake pad 38, which is arranged on a circumference close to 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 a role in supporting the outer ring position of the armature 32 to bear the elastic pressure of the outer ring elastic member 35, and the inner ring elastic member 36 will also apply elastic pressure to the inner ring position of the armature 32. If there is no component at the inner ring position to support the armature 32, the inner ring of the armature 32 will be deformed 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 a position in the armature 32 opposite to the inner ring elastic member 36, and the inner ring The elastic pressure applied by the elastic member 36 is just located 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 member 36, preventing the armature 32 from being deformed at the inner ring position due to the elastic pressure applied by the inner ring elastic member 36. On the other hand, the elastic pressure applied by the inner ring elastic member 36 presses the inner ring brake pad 38 against the end face of the brake disc 31, so that the inner ring brake pad 38 is in close contact with the brake disc 31, thereby making the inner ring brake pad 38 play the function of auxiliary braking, further increasing the braking torque output by the electromagnetic brake mechanism.

[0046] Preferably, the diameter of the outer ring elastic member 35 is greater than the diameter of the inner ring elastic member 36. Since the output of the braking torque mainly depends on the friction between the outer ring brake pad 38 and the brake disc 31, and the inner ring brake pad 38 only plays the role of auxiliary braking, the outer ring elastic member 35 adopts 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 member 36 adopts a spring with a small diameter. On the basis of ensuring that sufficient elastic pressure is applied to the inner ring brake pad 38 to achieve auxiliary braking, the inner ring elastic member 36 minimizes its volume as much as possible, thereby effectively reducing the volume of the entire electromagnetic brake mechanism.

[0047] Furthermore, if Figure 10-11As shown, each of the outer ring elastic members 35 is provided with an elastic force adjustment mechanism, which includes an adjustment screw 61 threadedly connected to the base 33 , and the bottom end of the adjustment screw 61 contacts one end of the outer ring elastic member 35 away from the armature 32 . Since the elastic parts in the brake mechanism will fatigue and deform after being used for a period of time, their elasticity will gradually weaken, especially for the outer ring elastic parts 35 that play a major braking role, the above situation is more likely to occur; therefore, in this embodiment, by setting a threaded hole in the base 33 corresponding to each outer ring elastic part 35, and the threaded hole is connected to the through hole 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 part 35 away from the armature 32, and the compression amount of the outer ring elastic part 35 can be adjusted by screwing the adjusting screw 61 to adjust the length of the outer ring elastic part 35 extending into the threaded hole; with such a configuration, when the elasticity of the outer ring elastic part 35 weakens due to fatigue or deformation, the compression amount and elasticity of the outer ring elastic part 35 can be adjusted by directly screwing the adjusting screw 61, eliminating the process of stopping the machine to replace new elastic parts, saving time and effort, and effectively extending the service life of the electromagnetic brake mechanism.

[0048] Furthermore, if Figure 10-11 As shown, the elastic force adjustment mechanism further includes a locking nut 62, and the locking nut 62 is threadedly connected to the outer side of the adjusting screw 61. In this embodiment, by arranging the locking nut 62 on the outer side of the adjusting screw 61, the adjusting screw 61 is effectively prevented from being loosened during use, thereby ensuring the compression amount and elasticity of the outer ring elastic member 35.

[0049] Furthermore, if Figure 8 and 9As shown, the CNC turntable also includes a circumferential positioning mechanism, which includes a plurality of positioning pins 81 fixed on the electromagnet 34, and the plurality of positioning pins 81 are arranged on a circumference close to the edge of the electromagnet 34. A positioning hole 82 is provided on the armature 32 corresponding to each of the positioning pins 81. The positioning pin 81 can be inserted into the corresponding positioning hole 82, and the center of each positioning pin 81 is set away from the center of the corresponding positioning hole 82, wherein a part of the positioning pins 81 are set against the inner wall on one side of the corresponding positioning hole 82 to prevent the armature 32 from rotating clockwise, and the remaining positioning pins 81 are set against the inner wall on the other side of the corresponding positioning hole 82 to prevent the armature 32 from rotating counterclockwise. In this embodiment, a plurality of positioning pins 81 are provided to guide the movement direction of the armature 32 to prevent the armature 32 from rotating in the circumferential direction during the movement; further, during the processing of the workpiece, the turntable 41 needs to be stationary so that the workpiece can be accurately kept in a certain position for processing. At this time, the electromagnetic brake mechanism is required to cooperate to keep the turntable 41 stationary. However, during the processing, the processing tool has a large processing pressure on the workpiece. Since there is a certain matching clearance between the positioning pins 81 and the positioning holes 82, the armature 32 may rotate slightly in the circumferential direction under the action of the processing pressure, that is, the turntable cannot be completely braked and accurately positioned, thereby affecting the position accuracy and processing accuracy of the workpiece; therefore, further, in this embodiment, the center of each positioning pin 81 is deviated from the relative The corresponding positioning hole 82 is centrally arranged. 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 is pressed against the inner wall of one side of the corresponding positioning hole 82. Two of the positioning pins 81 are offset in the counterclockwise direction relative to the positioning hole 82, and these two positioning pins 81 can limit the armature 32 from rotating clockwise. The remaining two positioning pins 81 are offset in the clockwise direction relative to the positioning hole 82, and the remaining two positioning pins 81 can limit the armature 32 from rotating counterclockwise. With this arrangement, even if there is a processing pressure, the armature 32 will not rotate circumferentially, thereby ensuring that the turntable 41 and the workpiece are completely braked and precisely positioned during the processing, thereby ensuring the processing accuracy.

[0050] Furthermore, if Figure 10-11As shown, the CNC turntable further includes a connecting screw 7 detachably connected to the armature 32, and a through hole 63 for the connecting screw 7 to pass through is provided in the middle of the adjusting screw 61. Specifically, a threaded connecting hole 321 is provided on the armature 32 corresponding to each adjusting screw 61. When the CNC turntable is disassembled and assembled, the electromagnet 34 needs to be powered off. At this time, under the action of the elastic member, the armature 32 cannot be connected to the electromagnet 34. Without the obstruction of the armature 32, the elastic member may also fall out of the through hole 342, which makes it inconvenient to disassemble and assemble the electromagnetic brake mechanism (excluding the brake disc 31) as a whole; therefore, in this embodiment, a connecting screw 7 that can be detachably connected to the armature is provided. When the CNC turntable needs to be assembled, the connecting screw 7 is passed through the through hole 63 in the middle of the adjusting screw 61 and is threadedly connected to the threaded connection hole 321 in the armature 32. The connecting screw 7 can overcome the elastic pressure of multiple elastic members and assemble the armature 32 and the electromagnet 34 together. With the obstruction of the armature 32, multiple elastic members will not fall out of the electromagnet 34, that is, the electromagnetic brake mechanism (excluding the brake disc 31) is formed into a whole, and then the assembled The electromagnetic brake mechanism (excluding the brake disc 31) is assembled with the torque motor part, so that the overall assembly of the CNC turntable is more convenient, and the installation position of the armature 32 and the elastic member can be ensured to be accurate. After the installation is completed, the electromagnet 34, the brake disc 31 and the positioning pin 81 have a positioning effect on the armature 32. At this time, the connecting screw 7 can be removed to prevent the connecting screw 7 from affecting the movement of the armature 32 during the braking process; when the CNC turntable needs to be disassembled to inspect the torque motor part, the electromagnet 34 is powered off at this time, and the connecting screw 73 is threadedly connected to the armature 32 again, and the electromagnetic brake mechanism (excluding the brake disc 31) can be assembled into a whole again, so that the integral electromagnetic brake mechanism can be directly disassembled, and then the torque motor part can be inspected. After the inspection is completed, the integral electromagnetic brake mechanism can be directly installed on the torque motor. It can be seen that by setting the connecting screw 7, the disassembly and assembly of the CNC turntable is convenient and fast, saving time and effort.

[0051] Furthermore, if Fig.12 As shown, a bearing 5 is provided at a position where the stator encapsulation sleeve 11 and the mover encapsulation sleeve 21 are close to each other at one end away from the base 33, the inner ring of the bearing 5 is sleeved on the mover encapsulation sleeve 21, and the outer ring of the bearing 5 is fixed on the stator encapsulation sleeve 11. In this embodiment, by providing the bearing 5, the friction between the stator mechanism and the mover mechanism is effectively reduced when the two rotate.

[0052] Furthermore, if Figure 4 , 12As shown in Figure 13, a plurality of limiting protrusions 111 are provided on one end surface of the stator packaging sleeve 11 close to the turntable 41, and a plurality of limiting grooves 411 cooperating with the limiting protrusions 111 are provided at the edge of the turntable. In this embodiment, the movement direction of the turntable 41 is effectively guaranteed by providing the limiting protrusions 111 and the limiting grooves 411.

[0053] Furthermore, if Fig.10 As shown, the electromagnet 34 includes an annular electromagnetic coil 341, and the annular electromagnetic coil 341 is arranged at a position close to the edge of the electromagnet 34. Specifically, the outer side of the electromagnetic coil 341 is arranged close to the inner side of the through hole 342, so that the electromagnetic coil 341 is arranged as close to the edge of the electromagnet 34 as possible. Since the magnetic force of the electromagnet has a centring effect, and the size of the electromagnetic brake mechanism in this embodiment is relatively large, if the magnetic force is concentrated at the center position, the electromagnet 34 may not be able to attract the large-sized armature 32. Therefore, in this embodiment, the electromagnetic coil is arranged as close to the edge of the electromagnet 34 as possible, so that the magnetic force on the outer side of the electromagnet is increased and the magnetic force at the center position is correspondingly weakened, so as to adapt to the elastic pressure of the outer ring elastic member 35 and the inner ring elastic member 36, and ensure reliable adsorption of the armature 32.

[0054] Furthermore, if Fig.10 and 12 As shown, the turntable mechanism also includes a hollow wire sleeve 42, which is fixed to one end of the turntable 41 close to the mover encapsulation sleeve 21, and the wire sleeve 42 passes through the mover encapsulation sleeve 21, the brake disc 31, the armature 32, the electromagnet 34, and the base 33 in sequence, and extends to the outside of the base 33. An encoder 9 is sleeved on the outside of one end of the wire sleeve 42 close to the base 33. In this embodiment, by providing 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; and because the wire sleeve 42 rotates with the turntable 41, the encoder 9 is provided in the wire sleeve 42, which can accurately measure the rotation angle of the turntable 41 on the one hand, and make the overall structure of the CNC turntable more compact on the other hand.

[0055] 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 large-scale CNC turntable with integrated brake and torque motor, comprising a stator mechanism, a mover mechanism, an electromagnetic brake mechanism and a turntable mechanism, characterized in that: The stator mechanism comprises a stator packaging sleeve (11), a stator (12) is fixed inside the stator packaging sleeve (11), and the mover mechanism is rotatably arranged inside the stator (12); The mover mechanism comprises a mover packaging sleeve (21), and a mover (22) is fixed on the outer side of the mover packaging sleeve (21); The turntable mechanism comprises a turntable (41), and the turntable (41) is fixed to one end of the mover packaging sleeve (21); The electromagnetic brake mechanism comprises a brake disc (31), an armature (32), a base (33), a brake pad assembly, an electromagnet (34) and an elastic assembly, wherein the brake disc (31) is fixed to one end of the mover packaging sleeve (21) away from the turntable (41), the base (33) is fixed to one end of the stator packaging sleeve (11) away from the turntable (41), the electromagnet (34) is fixed to one end of the base (33) close to the brake disc (31), and the armature (32) is movably arranged between the electromagnet (34) and the brake disc (31). The brake pad assembly is arranged at one end of the armature (32) close to the brake disc (31), and the brake pad assembly includes an outer ring brake pad (37), and the outer ring brake pad (37) is arranged on a circumference close to the edge of the armature (32). The elastic assembly includes a plurality of elastic members arranged in the electromagnet (34), and the ends of the plurality of elastic members close to the armature (32) are in contact with the ends of the armature (32) away from the brake disc (31), and the spacings between the plurality of elastic members and the center of the electromagnet (34) are at least partially unequal.

2. The large-scale CNC turntable with integrated brake and torque motor according to claim 1, characterized in that: The plurality of elastic members include a plurality of outer ring elastic members (35) and a plurality of inner ring elastic members (36), wherein the plurality of outer ring elastic members (35) are arranged on a circumference close to the edge of the electromagnet (34), and the position of the outer ring elastic members (35) is opposite to the position of the outer ring brake pad (37), and the plurality of inner ring elastic members (36) are arranged on a circumference close to the center of the electromagnet (34).

3. The large-scale CNC turntable with integrated brake and torque motor according to claim 2, characterized in that: The brake pad assembly also includes an inner ring brake pad (38), which is arranged on a circumference close to 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-scale CNC turntable with integrated brake and torque motor according to claim 2, characterized in that: Each of the outer ring elastic members (35) is provided with an elastic force adjustment mechanism, the elastic force adjustment mechanism comprising an adjustment screw (61) threadedly connected to the base (33), the bottom end of the adjustment screw (61) being in contact with an end of the outer ring elastic member (35) away from the armature (32).

5. The large-scale CNC turntable with integrated brake and torque motor according to claim 4, characterized in that: The elastic force adjustment mechanism further comprises a locking nut (62), wherein the locking nut (62) is threadedly connected to the outer side of the adjustment screw (61).

6. The large-scale CNC turntable with integrated brake and torque motor according to claim 4, characterized in that: The numerically controlled turntable further comprises a connecting screw (7) detachably connected to the armature (32), and a through hole (63) for the connecting screw (7) to pass through is provided in the middle of the adjusting screw (61).

7. The large-scale CNC turntable with integrated brake and torque motor according to claim 1, characterized in that: A bearing (5) is provided at a position where the stator encapsulation sleeve (11) and the mover encapsulation sleeve (21) are close to each other at one end away from the base (33); an inner ring of the bearing (5) is sleeved on the mover encapsulation sleeve (21); and an outer ring of the bearing (5) is fixed on the stator encapsulation sleeve (11).

8. The large-scale CNC turntable with integrated brake and torque motor according to claim 1, characterized in that: The numerical control turntable also includes a circumferential positioning mechanism, which includes a plurality of positioning pins (81) fixed on the electromagnet (34), wherein the plurality of positioning pins (81) are arranged on a circumference close to the edge of the electromagnet (34), and a positioning hole (82) is arranged on the armature (32) corresponding to each positioning pin (81), wherein the positioning pin (81) is inserted into the corresponding positioning hole (82), and the center of each positioning pin (81) is arranged to deviate from the center of the corresponding positioning hole (82), wherein a part of the positioning pins (81) are arranged to abut against the inner wall of one side of the corresponding positioning hole (82) to prevent the armature (32) from rotating clockwise, and the remaining positioning pins (81) are arranged to abut against the inner wall of the other side of the corresponding positioning hole (82) to prevent the armature (32) from rotating counterclockwise.

9. The large-scale CNC turntable with integrated brake and torque motor according to claim 1, characterized in that: The electromagnet (34) comprises an annular electromagnetic coil (341), and the annular electromagnetic coil (341) is arranged at a position close to the edge of the electromagnet (34).

10. The large-scale CNC turntable with integrated brake and torque motor according to 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) close to the mover packaging sleeve (21), and the wire sleeve (42) passes through the mover packaging sleeve (21), the brake disc (31), the armature (32), the electromagnet (34), and the base (33) in sequence, and extends to the outside of the base (33). An encoder (9) is sleeved on the outside of one end of the wire sleeve (42) close to the base (33).

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