A forced brake structure for an electric spindle

Abstract

The utility model discloses a forced braking structure for an electric spindle, comprising a spindle motor and a brake cylinder; both ends of an output shaft of the spindle motor extend outward, a brake disc is fixedly provided at one end of the output shaft, and a "V"-shaped brake groove is provided on the outer periphery of the brake disc; a pressure rod is provided at the output end of the brake cylinder, and the end of the pressure rod is adapted to the shape of the brake groove, and forced braking of the electric spindle is achieved by adopting a clamping method, which can stop the electric spindle more quickly than traditional friction brakes, and will not cause the problem of inertial deflection, thereby improving the braking effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric spindles, in particular to an electric spindle forced braking structure. Background Art

[0002] The electric spindle is one of the necessary parts for machine tool processing at present. During processing, the electric spindle will drive the tool or product to rotate at high speed for cutting. Accidents are inevitable during the processing, such as tool breakage or product damage. At this time, it is necessary to brake immediately to avoid causing greater losses. For example, in the technical solution of the Chinese public patent document "CN207695636U, electric spindle for CNC machine tools", the brake device includes a brake disc 51 and a hydraulic brake 52 that is interconnected with the brake disc 51. The rear end of the rotor sleeve 2 is provided with an abutting step 25, and the brake disc 51 abuts on the abutting step 25 and is installed at the rear end of the rotor sleeve 2 through a tight fit or a fixing mechanism;

[0003] Based on the above technical solution, friction braking is actually used. During the braking process, the problem of rotation angle deviation will still occur due to inertia, and the purpose of immediate braking cannot be achieved. Utility Model Content

[0004] The purpose of the utility model is to provide an electric spindle forced brake structure to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An electric spindle forced braking structure comprises a spindle motor and a brake cylinder;

[0007] Both ends of the output shaft of the spindle motor extend outwards, a brake disc is fixedly arranged at one end of the output shaft, and a "V"-shaped brake groove is arranged on the outer periphery of the brake disc;

[0008] A pressure rod is provided at the output end of the brake cylinder, and the end of the pressure rod is adapted to the shape of the brake groove.

[0009] According to a further technical solution, the brake cylinder is installed on the spindle motor through an extension plate.

[0010] According to a further technical solution, the spindle motor comprises a fixed seat, in which a stator assembly and a spindle assembly for use together are arranged, an air chamber is arranged at one end of the inner cavity of the fixed seat, and a heat dissipation hole connected to the air chamber is arranged on the outer side of the fixed seat.

[0011] According to a further technical solution, the fixing seat is provided with at least one air inlet hole connected to the air pipe, and the inner wall of the fixing seat is provided with at least one spiral air groove connected to the air inlet hole, the spiral air groove is communicated with the stator assembly and extends into the air bin.

[0012] According to a further technical solution, the spindle assembly includes a hollow rotor and a push rod inserted into the rotor, wherein a clamp is installed at one end of the rotor and a disassembly device is installed at the other end. The disassembly device extends into the rotor and is connected to the push rod, and one end of the push rod can abut against the clamp.

[0013] According to a further technical solution, the disassembly and assembly device comprises a locking assembly and a fixing assembly both sleeved on the end of the rotor;

[0014] The locking assembly comprises a hemispherical movable block sleeved on the rotor, the movable block is rotatably connected with the movable plate, one end of the movable plate is rotatably connected with the fixing member, and the other end is rotatably connected with the output end of the locking cylinder through a connecting member;

[0015] The fixing assembly includes a fixing sleeve fixed on the rotor, a plurality of clamping claws are rotatably connected to the fixing sleeve, a reset spring is provided between the fixing sleeve and the clamping claws, one end of the clamping claw can be movably abutted with the rotor, and the other end can be extended into the rotor and abutted with the end of the push rod.

[0016] Beneficial effects of the utility model:

[0017] The utility model realizes the forced braking of the electric spindle by adopting a clamping method, which can stop the operation of the electric spindle more quickly than the traditional friction brake, and will not cause the problem of inertial deflection, thereby improving the braking effect.

[0018] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : Planar structure diagram of the utility model.

[0020] Figure 2 : A planar cross-sectional view of the utility model.

[0021] Figure 3 : A three-dimensional structural diagram of the utility model.

[0022] Figure 4 : A three-dimensional cross-sectional view of the utility model.

[0023] Figure 5 : The disassembly and assembly device structure diagram of the utility model.

[0024] Figure markings: 1-spindle motor, 11-fixed seat, 12-stator assembly, 13-spindle assembly, 131-rotor, 132-rod, 133-through hole, 14-air chamber, 15-heat dissipation hole, 16-air inlet, 17-spiral air groove, 21-brake cylinder, 22-brake disc, 23-brake groove, 24-pressure rod, 25-extension plate, 31-locking assembly, 311-hemispherical movable block, 312-movable plate, 313-locking cylinder, 314-bearing, 32-fixed assembly, 321-fixed sleeve, 322-clamp. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Please refer to Figure 1-5 ;

[0027] The brake structure described in the utility model is intended to enable the electric spindle to achieve forced braking during high-speed operation, which is different from the traditional friction brake and improves the braking effect and speed; specifically, the spindle motor 1 and the brake cylinder 21, both ends of the output shaft of the spindle motor 1 extend outward, one end of the output shaft is used to install a fixture or a tool, the tool or fixture is not shown in the figure, and the other end is fixed with a brake disc 22. In this embodiment, the brake disc 22 and the output shaft can be fixed by spline. When forced braking is required, it is more secure than using screws and other fixing methods; the outer periphery of the brake disc 22 is provided with a "V"-shaped brake groove 23, and the output end of the brake cylinder 21 is provided with a pressure rod 24, the pressure rod 24 is opposite to the brake groove 23, and the end of the pressure rod 24 is adapted to the shape of the brake groove 23. It is further explained that since the brake disc 22 is coaxially arranged with the output shaft, that is, the pressure rod 24 is in a vertical state and always remains perpendicular to the axial direction of the output shaft;

[0028] Preferably, the brake cylinder 21 is installed on the spindle motor 1 through an extension plate 25, which can reduce the volume occupied. Secondly, the spindle motor 1 often needs to move, and installing the brake cylinder 21 on the spindle motor 1 can make it move with it, fix the relative positions of the two, and ensure the braking effect.

[0029] During normal operation, the brake cylinder 21 is in a retracted state, so that the pressure rod 24 is away from the brake groove 23. At the same time, the spindle motor 1 rotates the output shaft at a high speed, and the brake disc 22 rotates synchronously with the output shaft. When an emergency situation requires braking, the brake cylinder 21 quickly pushes the pressure rod 24 to extend and makes its end fit in the brake groove 23, thereby clamping the brake disc 22. It should be noted that after the emergency brake is triggered, the spindle motor 1 will generally stop running, and the output shaft only rotates by inertia at this time; of course, the spindle motor 1 stops running and brakes in an instant. During this process, the brake cylinder 21 will be in a continuous output state, so that the pressure rod 24 remains in a clamped state with the brake disc 22. In addition, the position where the pressure rod 24 contacts the brake groove 23 is subjected to force, and the pressure rod 24 applies a force perpendicular to the output shaft to the brake disc 22, while the force of the brake disc 22 at the contact point is perpendicular to the pressure rod 24, that is, the two forces are perpendicular to each other, so that the force on the brake disc 22 is the largest.

[0030] The utility model realizes the forced braking of the electric spindle by adopting a clamping method, which can stop the operation of the electric spindle more quickly than the traditional friction brake, and will not cause the problem of inertial deflection, thereby improving the braking effect.

[0031] The spindle motor 1 in the utility model is also provided with a heat dissipation structure, specifically including a fixed base 11, in which a stator assembly 12 and a spindle assembly 13 for use together are provided, and an air bin 14 is provided at one end of the inner cavity of the fixed base 11. Preferably, the air bin 14 is provided at the end away from the mounting fixture, and a plurality of heat dissipation holes 15 connected to the air bin 14 are provided on the outside of the fixed base 11; by providing the air bin 14, the colder air outside can enter the interior of the fixed base 11 from the heat dissipation holes 15 for gas exchange, and the colder air directly contacts the stator assembly 12 and the spindle assembly 13 for energy exchange, and is finally discharged from the heat dissipation holes 15 to achieve a heat dissipation effect. Of course, a dust net can be provided at the heat dissipation holes 15.

[0032] Furthermore, at least one air inlet 16 is provided on the fixing seat 11, and at least one spiral air groove 17 connected to the air inlet 16 is provided on the inner wall of the fixing seat 11. The spiral air groove 17 is communicated with the stator assembly 12 and extends into the air bin 14. In actual use, the air inlet 16 is connected to the high-speed air pipe, and the high-speed airflow enters the interior of the fixing seat 11 from the air inlet 16. Since the stator assembly 12 is tightly fitted with the inner side wall of the fixing seat 11, the air groove forms a spiral airway under the enclosure of the stator assembly 12 and the fixing seat 11. Therefore, the high-speed airflow does not directly enter the inner cavity of the fixing seat 11, but will go along the spiral airway and finally enter the air bin 14. During the formation process, the high-speed gas will directly contact the fixing seat 11 and the stator assembly 12, and can more directly absorb and take away the heat generated by the two, thereby achieving an air-cooling effect.

[0033] After passing through the air duct, the high-speed airflow will enter the air chamber 14. Since the high-speed airflow flows very fast, the overall temperature of the gas will not be too high. In addition, since the exhaust hole is not set too large, the pressure in the air chamber 14 will increase slightly. At this time, the airflow will enter the gap between the stator assembly 12 and the spindle assembly 13, and absorb and take away the heat of the spindle assembly 13 and the stator assembly 12 again, so as to realize secondary air cooling.

[0034] After the high-speed airflow accumulates in the air chamber 14, the air pressure in the air chamber 14 will increase slightly, so that the gas discharged from the heat dissipation holes 15 will be output in a jet state, and dust can be prevented from entering from the exhaust holes.

[0035] The main shaft assembly 13 of the utility model includes a hollow rotor 131 and a push rod 132 inserted into the rotor 131. A clamp is installed at one end of the rotor 131, and a disassembly device is installed at the other end. The push rod 132 is loosened and locked by the disassembly device, so as to control the relationship between the push rod 132 and the clamp and realize disassembly and installation.

[0036] Furthermore, the disassembly and assembly device is composed of two parts, including a locking assembly 31 and a fixing assembly 32 both sleeved on the end of the rotor 131;

[0037] Among them, the locking assembly 31 includes a hemispherical movable block 311 sleeved on the rotor 131, and the movable block is rotatably connected to the movable plate 312. Preferably, a space for accommodating the movable block is provided in the middle of the movable plate 312, and a bearing 314 is provided in the space. The two symmetrical ends of the bearing 314 are rotatably connected to the movable plate 312, and the inner side of the bearing 314 is fixedly connected to the movable block, that is, the movable block can rotate relative to the bearing 314, but cannot move axially relative to the bearing 314; in addition, one end of the movable plate 312 is rotatably connected to the fixed part, and this embodiment does not limit the movable part, as long as the relative position is fixed. Preferably, the fixed frame is an extension plate 25, and the other end of the movable plate 312 is rotatably connected to the output end of the locking cylinder 313 through a connecting part; when in action, the movable block can rotate with the rotor 131, and when axial movement is required, the movable plate 312 is driven to move up and down through the telescopic action of the locking cylinder 313.

[0038] In addition, the fixing assembly 32 includes a fixing sleeve 321 fixed on the rotor 131. The fixing sleeve 321 can also rotate synchronously with the rotor 131. A plurality of clamping claws 322 are rotatably connected to the fixing sleeve 321. A reset spring is provided between the fixing sleeve 321 and the clamping claws 322. One end of the clamping claw 322 can be movably abutted against the rotor 131, and the other end can be extended into the rotor 131 and abut against the end of the push rod 132.

[0039] When the cam 322 is in the closed position, the other ends of the jaws 322 are in a closed position, and the other ends of the jaws 322 are in a closed position.

[0040] It should be noted that the rotor 131 is provided with a plurality of through holes 133 corresponding to the clamping jaws 322 , so that the ends of the clamping jaws 322 can penetrate into the inner cavity.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric spindle forced braking structure, characterized in that: It comprises a spindle motor (1) and a brake cylinder (21); Both ends of the output shaft of the spindle motor (1) extend outwards, a brake disc (22) is fixedly provided at one end of the output shaft, and a "V"-shaped brake groove (23) is provided on the outer periphery of the brake disc (22); The output end of the brake cylinder (21) is provided with a pressure rod (24), and the end of the pressure rod (24) is adapted to the shape of the brake groove (23).

2. The electric spindle forced brake structure according to claim 1, characterized in that: The brake cylinder (21) is mounted on the spindle motor (1) via an extension plate (25).

3. The electric spindle forced brake structure according to claim 1 or 2, characterized in that: The spindle motor (1) comprises a fixed seat (11), wherein a stator assembly (12) and a spindle assembly (13) for use together are arranged in the fixed seat (11), an air chamber (14) is arranged at one end of the inner cavity of the fixed seat (11), and a heat dissipation hole (15) in communication with the air chamber (14) is arranged on the outer side of the fixed seat (11).

4. The electric spindle forced brake structure according to claim 3, characterized in that: The fixing seat (11) is provided with at least one air inlet hole (16) connected to the air pipe, and the inner wall of the fixing seat (11) is provided with at least one spiral air groove (17) connected to the air inlet hole (16), and the spiral air groove (17) is communicated with the stator assembly (12) and extends into the air bin (14).

5. The electric spindle forced brake structure according to claim 1, characterized in that: The spindle assembly (13) comprises a hollow rotor (131) and a push rod (132) inserted into the rotor (131); a clamp is installed at one end of the rotor (131) and a disassembly device is installed at the other end; the disassembly device extends into the rotor (131) and is connected to the push rod (132); one end of the push rod (132) can abut against the clamp.

6. The electric spindle forced brake structure according to claim 5, characterized in that: The disassembly and assembly device comprises a locking assembly (31) and a fixing assembly (32) both sleeved on the end of the rotor (131); The locking assembly (31) comprises a hemispherical movable block (311) sleeved on the rotor (131), the movable block being rotatably connected to a movable plate (312), one end of the movable plate (312) being rotatably connected to a fixing member, and the other end of the movable plate (312) being rotatably connected to an output end of a locking cylinder (313) via a connecting member; The fixing assembly (32) comprises a fixing sleeve (321) fixed on the rotor (131), a plurality of clamping claws (322) are rotatably connected to the fixing sleeve (321), a reset spring is provided between the fixing sleeve (321) and the clamping claws (322), one end of the clamping claw (322) can be movably abutted against the rotor (131), and the other end can extend into the rotor (131) and abut against the end of the push rod (132).

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