Electric spindle

Abstract

The invention discloses a motorized spindle which comprises a shell, a spindle, a motor and a motor, the shaft core is rotationally supported in the shell, a rotor is arranged on the shaft core, a through cavity is formed in the shaft core in the axial direction, a driving key is fixedly arranged at one end of the through cavity, a cooling groove is formed in the driving key, at least one set of cooling flow channels are evenly distributed in the circumferential direction of the shaft core, and each cooling flow channel comprises a first cooling channel and a second cooling channel; the end parts of the first cooling channel and the second cooling channel are connected through a cooling groove; and the broach mechanism is arranged at one end of the shell, and the broach mechanism is provided with a cooling inflow channel and a cooling discharge channel. The first cooling channel and the second cooling channel are arranged on the shaft core, so that the cooling effect on the shaft core is achieved; and a cooling inflow channel and a cooling discharge channel are arranged in the broach mechanism, and the broach mechanism is arranged in the through cavity of the shaft core to cool the interior of the shaft core and the broach mechanism, so that the effect of simultaneously cooling the shaft core and the broach mechanism is integrally achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric spindles, and in particular to an electric spindle. Background Art

[0002] When the spindle rotates at high speed, the motor will generate heat in the working state and the bearings will rotate. The generated heat is transferred to the core shaft, which will experience thermal expansion effect, resulting in reduced spindle processing accuracy and shortened service life. Common cooling systems only cool the heat generated by the broaching mechanism, and there is no direct and effective way to cool the heat on the high-speed rotating shaft core.

[0003] Based on the above reasons, it is necessary to improve the existing technology. Summary of the Invention

[0004] 1. Technical Problems to be Solved

[0005] The present invention is aimed at the above-mentioned defects in the prior art and specifically proposes an electric spindle to solve the problems raised in the above-mentioned background technology.

[0006] 2. Technical Solution

[0007] In order to solve the above technical problems, the present invention provides an electric spindle, comprising a housing, in which a stator is fixedly arranged;

[0008] A shaft core, the shaft core being rotatably supported in the housing, the rotor being fixedly mounted on the shaft core, and a through cavity being axially disposed therein, a drive key being fixedly disposed at one end of the through cavity, the drive key being provided with a cooling groove, at least one group of cooling channels being evenly distributed in the circumferential direction of the shaft core, the cooling channels comprising a first cooling channel and an adjacent second cooling channel, the ends of the first cooling channel and the second cooling channel being connected via the cooling groove;

[0009] A broaching mechanism is provided at one end of the shell, and part of the broaching mechanism is provided in the through cavity. The broaching mechanism is provided with a cooling inlet channel and a cooling outlet channel. The cooling inlet channel is connected to the first cooling channel, and the cooling outlet channel is connected to the second cooling channel.

[0010] In the above technical solution, the broaching mechanism includes a driving device fixed at one end of the shell, a cover plate fixedly arranged at one end of the driving device, an end seat arranged in the inner cavity of the driving device, a center rod arranged in the driving device, a resin ring sleeved on the center rod, a pull rod connected to one end of the center rod through a transmission ring, and a pull claw assembly arranged at one end of the pull rod. The pull rod is arranged in the through cavity and can drive the pull claw assembly to reciprocate along the axial direction of the shaft core, thereby driving the pull claw assembly to extend or retract into the through cavity.

[0011] In the above technical solution, a cooling inlet and a cooling outlet are provided on the cover plate, a first annular groove and a second annular groove are recessed on the pull rod, the cooling inlet channel includes a third cooling channel arranged at the axial position of the center rod and a fourth cooling channel symmetrically arranged in the pull rod, the fourth cooling channel and the first cooling channel are connected through a first annular groove, the third cooling channel is connected to the cooling inlet, the cooling exhaust channel includes a fifth cooling channel arranged in the pull rod, a sixth cooling channel arranged in the center rod and a seventh cooling channel arranged in the end seat, the fifth cooling channel and the second cooling channel are connected through a second annular groove, the seventh cooling channel and the sixth cooling channel are connected through the resin ring, the other end of the seventh cooling channel is connected to the cooling outlet, and the cooling exhaust channel is symmetrically arranged in the broaching mechanism.

[0012] In the above technical solution, the device for rotatably supporting the shaft core is a support bearing.

[0013] In the above technical solution, the driving device is fixedly arranged at one end of the shell through a fixing plate.

[0014] 3. Beneficial Effects

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention achieves a cooling effect on the shaft core by arranging a first cooling channel and a second cooling channel on the shaft core, and then arranges a cooling inlet channel and a cooling exhaust channel in the broaching mechanism and arranges the broaching mechanism in the shaft core cavity to cool the interior of the shaft core and the broaching mechanism, thereby achieving a simultaneous cooling effect on the shaft core and the broaching mechanism as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the seventh cooling channel of the present invention.

[0018] Figure 3 This is a schematic cross-sectional structural diagram of the sixth cooling channel position of the present invention.

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the fifth cooling channel of the present invention.

[0020] Figure 5 This is a schematic cross-sectional structural diagram of the fourth cooling channel position of the present invention.

[0021] In the figure: 1 is a shell, 10 is a stator, 2 is a shaft core, 20 is a rotor, 21 is a drive key, 22 is a cooling channel, 210 is a cooling groove, 220 is a first cooling channel, 221 is a second cooling channel, 3 is a broaching mechanism, 30 is a cooling inlet channel, 31 is a cooling outlet channel, 32 is a driving device, 33 is a cover plate, 34 is an end seat, 35 is a center rod, 36 is a resin ring, 37 is a transmission ring, 38 is a pull rod, 39 is a claw assembly, 300 is a third cooling channel, 301 is a fourth cooling channel, 310 is a fifth cooling channel, 311 is a sixth cooling channel, 312 is a seventh cooling channel, 320 is a fixed disk, 330 is a cooling inlet, 331 is a cooling outlet, 380 is a first annular groove, and 381 is a second annular groove. DETAILED DESCRIPTION

[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0023] See also Figure 1-5 , the present invention provides an electric spindle, comprising a housing 1, wherein a stator 10 is fixedly arranged in the housing 1;

[0024] A shaft core 2, the shaft core 2 being rotatably supported in the housing 1, a rotor 20 being fixedly mounted on the shaft core 2, and a through cavity being axially disposed therein, a drive key 21 being fixedly disposed at one end of the through cavity, a cooling groove 210 being disposed on the drive key 21, at least one group of cooling channels 22 being evenly distributed circumferentially on the shaft core 2, the cooling channels 22 including a first cooling channel 220 and an adjacent second cooling channel 221, the ends of the first cooling channel 220 and the second cooling channel 221 being connected via the cooling groove 210;

[0025] The broaching mechanism 3 is arranged at one end of the shell 1, and part of it is arranged in the through cavity. The broaching mechanism 3 is provided with a cooling inlet channel 30 and a cooling outlet channel 31. The cooling inlet channel 30 is connected to the first cooling channel 220, and the cooling outlet channel 31 is connected to the second cooling channel 221.

[0026] In the above structure, the cooperation between the stator and the rotor in the electric spindle enables the rotor to drive the shaft core to rotate at high speed around the central axis, thereby generating heat. The cooling medium enters the broaching mechanism through the cooling inlet channel and flows to the first cooling channel, and then flows into the second cooling channel through the cooling groove. It flows from the second cooling channel to the cooling exhaust channel and then is discharged from the electric spindle. As a whole, the cooling medium circulates in the broaching mechanism and the shaft core to achieve cooling of the broaching mechanism and the shaft core.

[0027] Specifically, the broaching mechanism 3 includes a driving device 32 fixed to one end of the housing 1, a cover plate 33 fixed to one end of the driving device 32, an end seat 34 arranged in the inner cavity of the driving device 32, a center rod 35 arranged in the driving device 32, a resin ring 36 sleeved on the center rod 35, a pull rod 38 connected to one end of the center rod 35 through a transmission ring 37, and a pull claw assembly 39 arranged at one end of the pull rod 38. The pull rod 38 is arranged in the through cavity and can drive The claw assembly 39 moves back and forth axially along the shaft core 2, thereby driving the claw assembly 39 to extend or retract into the through cavity. The driving device drives the pull rod to extend axially along the shaft core in the through cavity, so that the claw assembly is driven by the pull rod to synchronously extend axially out of the through cavity, and the claw assembly realizes tool unloading. The driving device reverses and drives the pull rod to retract axially along the shaft core in the through cavity, so that the claw assembly is driven by the pull rod to synchronously retract axially into the through cavity, and the claw assembly realizes the effect of clamping the tool, thereby realizing the overall effect of the claw assembly efficiently clamping and releasing the tool.

[0028] Specifically, a cooling inlet 330 and a cooling outlet 331 are provided on the cover plate 33, a first annular groove 380 and a second annular groove 381 are recessed on the pull rod 38, the cooling inlet channel 30 includes a third cooling channel 300 provided at the axial position of the center rod 35 and a fourth cooling channel 301 symmetrically provided in the pull rod 38, the fourth cooling channel 301 and the first cooling channel 220 are communicated with each other through the first annular groove 380, the third cooling channel 300 is communicated with the cooling inlet 330, the cooling exhaust channel 31 includes a fifth cooling channel 310 provided in the pull rod 38, a sixth cooling channel 311 provided in the center rod 35 and a seventh cooling channel 312 provided in the end seat 34, the fifth cooling channel 310 and the second cooling channel 221 are communicated with each other through the second annular groove 381, the seventh cooling channel 312 and the sixth cooling channel 311 are communicated with each other through the tree The grease ring 36 is connected, and the other end of the seventh cooling channel 312 is connected to the cooling outlet 331. The cooling discharge channel 31 is symmetrically arranged in the broaching mechanism 3. In the above structure, the cooling medium flows from the cooling inlet to the third cooling channel and is divided into the upper and lower fourth cooling channels. The cooling medium flows from the upper and lower fourth cooling channels through the first annular groove into multiple different first cooling channels respectively, and then flows through the cooling groove to the second cooling channel corresponding to each first cooling channel, and flows to the second annular groove position through the second cooling channel. The cooling medium flowing from the multiple second cooling channels is then merged by the second annular groove and output to the upper and lower fifth cooling channels. The cooling medium in the fifth cooling channel flows to the corresponding sixth cooling channel, and then flows into the seventh cooling channel through the resin ring and is discharged to the cooling outlet. The overall structure allows the cooling medium to flow through the shaft core, pull rod, center rod and end seat and then be discharged, which greatly improves the cooling effect of the cooling medium on the shaft core.

[0029] Specifically, the device for rotatably supporting the shaft core 2 is a support bearing, which can effectively disperse the radial load on the shaft core, reduce the bending deformation of the shaft core, and at the same time reduce the friction coefficient of the shaft core when rotating at high speed to improve operating efficiency.

[0030] Specifically, the driving device 32 is fixedly arranged at one end of the shell 1 through a fixing plate 320. Using the fixing plate as a fixed driving device can make the driving device easy to disassemble and install, simplifying the installation process while achieving multiple uses.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An electric spindle, characterized in that: include: A housing (1), wherein a stator (10) is fixedly arranged in the housing (1); A shaft core (2), the shaft core (2) is rotatably supported in the housing (1), a rotor (20) is fixedly provided on the shaft core (2), and a through cavity is provided in the shaft core (2) along the axial direction, a driving key (21) is fixedly provided at one end of the through cavity, a cooling groove (210) is provided on the driving key (21), at least one group of cooling channels (22) is uniformly distributed in the circumferential direction of the shaft core (2), the cooling channels (22) include a first cooling channel (220) and a second cooling channel (221) adjacent thereto, and the ends of the first cooling channel (220) and the second cooling channel (221) are connected via the cooling groove (210); A broaching mechanism (3), the broaching mechanism (3) being arranged at one end of the housing (1), and partially arranged in the through cavity, the broaching mechanism (3) being provided with a cooling inlet channel (30) and a cooling outlet channel (31), the cooling inlet channel (30) being in communication with the first cooling channel (220), and the cooling outlet channel (31) being in communication with the second cooling channel (221).

2. The electric spindle according to claim 1, characterized in that: The broaching mechanism (3) includes a driving device (32) fixed at one end of the housing (1), a cover plate (33) fixed at one end of the driving device (32), an end seat (34) arranged in the inner cavity of the driving device (32), a center rod (35) arranged in the driving device (32), a resin ring (36) sleeved on the center rod (35), a pull rod (38) connected to one end of the center rod (35) through a transmission ring (37), and a pull claw assembly (39) arranged at one end of the pull rod (38), wherein the pull rod (38) is arranged in the through cavity and can drive the pull claw assembly (39) to move back and forth axially along the shaft core (2), thereby driving the pull claw assembly (39) to extend or retract into the through cavity.

3. The electric spindle according to claim 2, characterized in that: The cover plate (33) is provided with a cooling inlet (330) and a cooling outlet (331); the pull rod (38) is recessed with a first annular groove (380) and a second annular groove (381); the cooling inlet channel (30) includes a third cooling channel (300) provided at the axial position of the center rod (35) and a fourth cooling channel (301) symmetrically provided in the pull rod (38); the fourth cooling channel (301) and the first cooling channel (220) are communicated through the first annular groove (380); the third cooling channel (300) is communicated with the cooling inlet (330); and the cooling outlet channel (31) is connected to the cooling outlet (31). It includes a fifth cooling channel (310) provided in the draw rod (38), a sixth cooling channel (311) provided in the center rod (35), and a seventh cooling channel (312) provided in the end seat (34); the fifth cooling channel (310) and the second cooling channel (221) are connected via a second annular groove (381); the seventh cooling channel (312) and the sixth cooling channel (311) are connected via the resin ring (36); the other end of the seventh cooling channel (312) is connected to the cooling outlet (331); and the cooling discharge channel (31) is symmetrically provided in the broaching mechanism (3).

4. The electric spindle according to claim 1, characterized in that: The device for rotatably supporting the shaft core (2) is a support bearing.

5. The electric spindle according to claim 2, characterized in that: The driving device (32) is fixedly arranged at one end of the housing (1) via a fixing plate (320).

Images