An electric spindle drive assembly for a rack-type head CNC milling machine

Abstract

The utility model relates to a kind of electric spindle drive assembly for comb cutter head CNC milling machine, belong to comb cutter head CNC milling machine technical field.The device includes shell, bobbin and core shaft, the shell housing is provided with cooling structure, the shell inside is attached and is installed with bobbin, the bobbin is rotationally installed with core shaft, the core shaft output end is sequentially provided with primary reduction structure and secondary reduction structure, and the output end outside of primary reduction structure is installed with bushing.The electric spindle drive assembly is used, cooling channel and inlet and outlet water hole are penetrated by being set in the shell inside, the high-efficiency cooling of electric spindle is realized, temperature rise is effectively controlled, the running stability and life of core shaft are improved;The structure of primary cycloidal reduction and secondary gear reduction combination is realized, the stable output of high torque, low speed is realized, suitable for high load processing scene, and the overall structure is compact, convenient to install and use in comb cutter head.

Description

Technical Field

[0001] The utility model relates to the technical field of CNC milling machines with gang tool posts, in particular to a motorized spindle drive assembly for a CNC milling machine with a gang tool post. Background Art

[0002] A CNC milling machine with a gang tool post is a high-efficiency CNC machine tool equipped with a high-density automatic tool change system, whose power comes from a highly integrated motorized spindle drive assembly. As the core power source of the machine tool, this assembly provides accurate, stable all-around power output for the cutting tool that can meet the requirements from high-speed finish machining to heavy-load rough machining.

[0003] During the high-speed operation of the existing motorized spindle drive assembly, the heat generated by the internal coils and permanent magnets of the motorized spindle is difficult to dissipate quickly, which easily leads to excessive temperature rise and affects the accuracy and service life of the core shaft. In addition, the traditional motorized spindle usually adopts a single speed reduction structure, with limited output torque, making it difficult to adapt to the machining requirements of high load and high precision.

[0004] Therefore, the utility model proposes a motorized spindle drive assembly for a CNC milling machine with a gang tool post. Contents of the Utility Model

[0005] On this basis, in order to overcome the common problems of poor heat dissipation performance and insufficient output torque.

[0006] The technical solution of the utility model is as follows: a motorized spindle drive assembly for a CNC milling machine with a gang tool post, comprising a housing, a winding drum and a core shaft, wherein a cooling structure is arranged in the housing body, the winding drum is installed in a fitting manner inside the housing, the core shaft is rotatably installed in the winding drum, the output end of the core shaft is sequentially provided with a first-stage speed reduction structure and a second-stage speed reduction structure, and a bushing is installed on the outer side of the output end of the first-stage speed reduction structure.

[0007] Preferably, the inner cross section of the housing is in a shape of a Chinese character "zhong", the side walls at both ends of the housing are respectively provided with a water inlet and a water outlet, a cooling channel is spirally arranged in the housing body in a threaded surrounding manner, and the cooling channel is in communication with the water inlet and the water outlet.

[0008] Preferably, a plurality of protruding blocks are arranged around the inner wall of the winding drum, coils are wound on the outer walls of the protruding blocks, the core shaft is transversely arranged at the center of the winding drum, a plurality of permanent magnets are arranged around the outer wall of the core shaft, bearings are sleeved at both ends of the core shaft, the core shaft is rotatably connected with the inner walls of the outlets at both ends of the housing through the bearings, the tail end of the core shaft is rotatably installed in a shaft seat, and the shaft seat is fixedly connected with the tail end of the housing.

[0009] Preferably, the first-stage reduction structure includes a pin tooth housing, eccentric blocks, a pin shaft, and an output flange. The pin tooth housing is engaged with the front end of the outer housing. The front end extension of the core shaft extends into the pin tooth housing. Two eccentric blocks with a phase difference of 180 degrees are sequentially fitted onto the outer wall of the front end extension of the core shaft. A first cycloidal wheel and a second cycloidal wheel are respectively fitted onto the outer side of the two eccentric blocks. Several corresponding pin holes are evenly distributed on the surfaces of the first cycloidal wheel and the second cycloidal wheel. The pin shaft passes through the pin holes and its end is fixed to the output flange. The output flange is rotatably installed in the pin tooth housing through a bushing.

[0010] Preferably, the two-stage reduction structure includes an input gear, an intermediate gear, transmission gears, and a low-speed wheel. A connecting cover is fixedly connected to the front end of the pinion housing. The input gear is fixedly installed through the connecting cover at the front end of the output flange. An intermediate gear shaft is rotatably installed on the connecting cover. The intermediate gear shaft has the intermediate gear and transmission gear integrally formed on it. The intermediate gear meshes with the input gear. An output shaft is rotatably installed on the connecting cover. A low-speed wheel is fixedly installed on the output shaft. The low-speed wheel meshes with the transmission gears.

[0011] Preferably, the needle tooth shell and the connecting cover together form a sealed cavity, which is filled with grease.

[0012] Preferably, a top cover is fixedly installed at the front end of the housing by bolts, and the output shaft passes through the top cover and extends outward.

[0013] The beneficial effects of this utility model are: 1. When in use, the electric spindle drive assembly achieves efficient cooling of the electric spindle through the cooling channel inside the housing connected to the water inlet and outlet, effectively controlling the temperature rise and improving the operational stability and lifespan of the core spindle. 2. When in use, this electric spindle drive assembly achieves stable output of high torque and low speed through a combination of a first-stage cycloidal reduction and a second-stage gear reduction, making it suitable for high-load machining scenarios. At the same time, the overall structure is compact and easy to install and use in a comb tool holder. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention. Figure 2The diagram shown is a three-dimensional structural diagram of the core shaft installation of this utility model. Figure 3 The diagram shown is a three-dimensional structural schematic of the winding drum of this utility model. Figure 4 The diagram shown is a three-dimensional structural diagram of the first cycloidal wheel of this utility model. Figure 5 The diagram shown is a three-dimensional structural diagram of the input gear installation of this utility model.

[0016] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Winding drum; 3. Coil; 4. Bearing; 5. Core shaft; 6. Permanent magnet; 7. Shaft seat; 8. Needle tooth shell; 9. Eccentric block; 10. First cycloidal wheel; 11. Second cycloidal wheel; 12. Pin shaft; 13. Output flange; 14. Connecting cover; 15. Input gear; 16. Intermediate gear; 17. Transmission gear; 18. Output shaft; 19. Low-speed wheel; 20. Top cover. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0020] Please see Figures 1-5The present utility model provides a technical solution: an electric spindle drive assembly for a comb-type tool post CNC milling machine, comprising a housing 1, a winding drum 2 and a core shaft 5. A cooling structure is arranged in the shell of the housing 1, the winding drum 2 is mounted in a fitting manner inside the housing 1, the core shaft 5 is rotatably mounted inside the winding drum 2, the output end of the core shaft 5 is sequentially provided with a first-stage speed reduction structure and a second-stage speed reduction structure, and a bushing is mounted on the outer side of the output end of the first-stage speed reduction structure.

[0021] The internal cross section of the housing 1 is in a shape of Chinese character "中", the side walls at both ends of the housing 1 are respectively provided with a water inlet and a water outlet, a cooling channel is spirally arranged in the shell of the housing 1 in a threaded surrounding manner, and the cooling channel is communicated with the water inlet and the water outlet; The cooling channel arranged in a threaded surrounding manner inside the shell here is used to guide the cooling liquid to flow in a tight spiral manner within the wall of the housing 1, thereby effectively controlling the working temperature rise of the electric spindle.

[0022] A plurality of protruding blocks are arranged around the inner wall of the winding drum 2, a coil 3 is wound around the outer wall of the protruding blocks, the core shaft 5 is transversely arranged at the center of the winding drum 2, a plurality of permanent magnets 6 are arranged around the outer wall of the core shaft 5, bearings 4 are sleeved at both ends of the core shaft 5, the core shaft 5 is rotatably connected with the inner walls of the outlets at both ends of the housing 1 through the bearings 4, the tail end of the core shaft 5 is rotatably mounted in a shaft seat 7, and the shaft seat 7 is fixedly connected with the tail end of the housing 1; Here, the bearings 4 at both ends of the core shaft 5 are used to provide two-point support for the core shaft 5, which greatly enhances the rotational stiffness and operation stability of the core shaft 5, and reduces vibration and radial runout during high-speed rotation.

[0023] The first-stage speed reduction structure comprises a pin gear housing 8, eccentric blocks 9, pin shafts 12 and an output flange 13. The pin gear housing 8 is mounted at the front end of the housing 1 in a clamping manner, the extending part at the front end of the core shaft 5 extends into the pin gear housing 8, two eccentric blocks 9 with a phase difference of 180 degrees are sequentially sleeved on the outer wall of the extending part at the front end of the core shaft 5, the outer sides of the two eccentric blocks 9 are respectively sleeved with a first cycloidal gear 10 and a second cycloidal gear 11, a plurality of corresponding pin holes are uniformly distributed on the surfaces of the first cycloidal gear 10 and the second cycloidal gear 11, the pin shafts 12 pass through the pin holes and the tail ends of the pin shafts 12 are fixed on the output flange 13, and the output flange 13 is rotatably mounted in the pin gear housing 8 through a bushing.

[0024] The second-stage speed reduction structure comprises an input gear 15, an intermediate gear 16, a transmission tooth 17 and a low-speed wheel 19. The front end of the pin gear housing 8 is fixedly connected with a connecting cover 14, the front end of the output flange 13 passes through the connecting cover 14 and is fixedly mounted with the input gear 15, an intermediate gear shaft is rotatably mounted on the connecting cover 14, the intermediate gear 16 and the transmission tooth 17 are integrally formed on the intermediate gear shaft, the intermediate gear 16 and the input gear 15 are meshed with each other, an output shaft 18 is rotatably mounted on the connecting cover 14, the low-speed wheel 19 is fixedly mounted on the output shaft 18, and the low-speed wheel 19 and the transmission tooth 17 are meshed with each other.

[0025] The needle-tooth shell 8 and the connecting cover 14 together form a sealed cavity, which is filled with grease. Here, grease is used to provide centralized lubrication and sealing for the gears in the first and second stage reduction gears, thereby ensuring the long-term stable operation of the transmission components and reducing maintenance requirements.

[0026] The front end of the housing 1 is fixed with a top cover 20 by bolts, and the output shaft 18 passes through the top cover 20 and extends outward.

[0027] Working principle: See Figures 1-5 As shown, when the device is powered on, the coil 3 wound on the protrusion on the inner wall of the winding drum 2 is supplied with alternating current, generating a high-speed rotating magnetic field. This rotating magnetic field interacts with the permanent magnet 6 fixed on the outer wall of the core shaft 5, generating an electromagnetic force, thereby driving the core shaft 5 and the permanent magnet 6 on it to rotate as a whole around its axis at high speed.

[0028] See Figures 2-4 As shown, the two ends of the core shaft 5 are supported on the outer shell 1 and the bearing 7 by bearings 4. The front extension of the high-speed rotating core shaft 5 directly drives the two eccentric blocks 9 on its hollow sleeve to rotate. The rotation of the eccentric blocks 9 drives the two cycloidal wheels to produce planar, eccentric oscillating motion. At the same time, the outer teeth of the cycloidal wheels mesh with the needle teeth on the inner circumference of the fixed needle tooth shell 8. Under the meshing action, the eccentric oscillating motion of the cycloidal wheels is converted into a rotational motion around the axis with a significantly reduced speed. The decelerated rotational motion is transmitted to the output flange 13 through several pins 12 evenly distributed in the pin holes of the cycloidal wheels. The output flange 13 is supported in the needle tooth shell 8 by a bushing, thereby realizing the decelerated power output. Thus, the first stage of high-speed rotation and low-speed output deceleration and torque increase process is completed.

[0029] See Figures 3-5 As shown, the power after the first stage of reduction is output from the front end of the output flange 13, driving the input gear 15 fixed thereon to rotate synchronously. The input gear 15 meshes with the intermediate gear 16 on the intermediate gear shaft for the first gear reduction. The transmission gear 17 on the intermediate gear shaft is integrated with the intermediate gear 16 and rotates synchronously with it. The transmission gear 17 then meshes with the low-speed gear 19 fixed on the output shaft 18 for the second gear reduction. After these two stages of gear transmission, the speed is further reduced, and the output torque increases accordingly. Finally, the power is output from the output shaft 18 to drive the cutting tool on the comb tool holder for machining.

[0030] During the high-speed operation of the electric spindle, the coil 3 and the permanent magnet 6 generate a large amount of heat due to electromagnetic effect and friction. The coolant is pumped in from the inlet at one end of the housing 1 and flows through the cooling channel opened in the housing 1 by the thread. This channel is close to the outside of the heat source and can efficiently remove the heat. After absorbing the heat, the coolant finally flows out from the outlet at the other end of the housing 1, forming a continuous circulation, thereby controlling the working temperature of the electric spindle within a reasonable range and ensuring its accuracy and life.

[0031] It should be noted that the above-mentioned electric spindle and its control circuit can be powered by existing operating techniques, whether using a power supply unit or an external wire. These are all existing conventional operating techniques and will not be described in detail here.

[0032] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric spindle drive assembly for a comb-type CNC milling machine, comprising a housing (1), a winding drum (2), and a core shaft (5), characterized in that: A cooling structure is arranged in the housing of the outer casing (1), a winding drum (2) is mounted in close fit inside the outer casing (1), a core shaft (5) is rotatably mounted inside the winding drum (2), the output end of the core shaft (5) is sequentially provided with a first-stage speed reduction structure and a second-stage speed reduction structure, and a bushing is mounted on the outer side of the output end of the first-stage speed reduction structure.

2. The electric spindle drive assembly for a comb-type CNC milling machine according to claim 1, characterized in that: The internal cross section of the outer casing (1) is in a shape of the Chinese character "zhong", the side walls at both ends of the outer casing (1) are respectively provided with a water inlet and a water outlet, a cooling channel is arranged in the housing of the outer casing (1) in a surrounding threaded manner, and the cooling channel is in communication with the water inlet and the water outlet.

3. The electric spindle drive assembly for a comb-type CNC milling machine according to claim 1, characterized in that: A plurality of protruding blocks are arranged around the inner wall of the winding drum (2), a coil (3) is wound around the outer wall of the protruding blocks, the core shaft (5) is transversely arranged at the center of the winding drum (2), a plurality of permanent magnets (6) are arranged around the outer wall of the core shaft (5), bearings (4) are sleeved at both ends of the core shaft (5), the core shaft (5) is rotatably connected with the inner walls of the outlets at both ends of the outer casing (1) through the bearings (4), the tail end of the core shaft (5) is rotatably mounted in a shaft seat (7), and the shaft seat (7) is fixedly connected with the tail end of the outer casing (1).

4. The electric spindle drive assembly for a comb-type CNC milling machine according to claim 1, characterized in that: The first-stage speed reduction structure comprises a pin gear housing (8), eccentric blocks (9), pin shafts (12) and an output flange (13), the pin gear housing (8) is snap-fitted and mounted at the front end of the outer casing (1), the front extending portion of the core shaft (5) extends into the pin gear housing (8), two eccentric blocks (9) with a phase difference of 180 degrees are sequentially sleeved on the outer wall of the front extending portion of the core shaft (5), the outer sides of the two eccentric blocks (9) are respectively sleeved with a first cycloidal wheel (10) and a second cycloidal wheel (11), a plurality of corresponding pin holes are evenly distributed on the surfaces of the first cycloidal wheel (10) and the second cycloidal wheel (11), the pin shafts (12) pass through the pin holes and the tail ends of the pin shafts (12) are fixed on the output flange (13), and the output flange (13) is rotatably mounted in the pin gear housing (8) through the bushing.

5. The electric spindle drive assembly for a comb-type CNC milling machine according to claim 4, characterized in that: The second-stage speed reduction structure comprises an input gear (15), a middle gear (16), a transmission tooth (17) and a low-speed wheel (19), the front end of the pin gear housing (8) is fixedly connected with a connecting cover (14), the front end of the output flange (13) passes through the connecting cover (14) and is fixedly mounted with the input gear (15), an intermediate gear shaft is rotatably mounted on the connecting cover (14), the middle gear (16) and the transmission tooth (17) are integrally formed on the intermediate gear shaft, the middle gear (16) is meshed with the input gear (15), an output shaft (18) is rotatably mounted on the connecting cover (14), the low-speed wheel (19) is fixedly mounted on the output shaft (18), and the low-speed wheel (19) is meshed with the transmission tooth (17).

6. The electric spindle drive assembly for a comb-type CNC milling machine according to claim 5, characterized in that: The pin gear housing (8) and the connecting cover (14) jointly enclose a sealed cavity, and the cavity is filled with lubricating grease.

7. The electric spindle drive assembly for a comb-type CNC milling machine according to claim 5, characterized in that: The front end of the outer casing (1) is fixedly mounted with a top end cover (20) through bolts, and the output shaft (18) passes through the top end cover (20) and extends outward.

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