Short-span electric spindle capable of retracting quickly

Abstract

The short-span quick-retracting electric spindle comprises an inner shell, a stator is fixedly connected in the inner shell, a rotor is connected in the stator in a sleeved mode, a mandrel is fixedly connected in the rotor, a pull rod is slidably connected in the mandrel, a rear bearing seat is fixedly connected to one end of the inner shell, and a flange plate is fixedly connected to one end of the rear bearing seat. A hydraulic cylinder is fixedly connected to the flange plate, and the output end of the hydraulic cylinder is fixedly connected to the pull rod. The front bearing and the rear bearing which are originally located outside the motor are integrally placed inside the motor, so that the supporting span of the core shaft is effectively shortened, the rotation angle deviation generated by stress of the core shaft in the operation process is reduced, the rotation precision and stability of the electric spindle are greatly improved, and the machining precision is improved; compared with a double-cavity single-piston hydraulic cylinder on a traditional motorized spindle, the three-cavity double-piston supercharged hydraulic cylinder can act more quickly by driving the pull rod in the mandrel, so that quick feeding and retracting operation of a cutter is realized, the non-cutting time in the machining process is shortened, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, and in particular to an electric spindle with short span and fast tool retraction. Background Art

[0002] The electric spindle is a high-precision mechanical device that integrates the machine tool spindle and the spindle motor. Its core components include the rotor, stator, bearings and cooling system. The existing electric spindles have the following disadvantages when in use: 1. The front and rear bearings of the existing electric spindles are arranged outside the motor, which makes the span of the electric spindle relatively long. During the rotation process, the long span easily causes the electric spindle to produce a large angle change, which will affect the rotation accuracy of the electric spindle and thus affect the processing accuracy of the product; 2. The existing electric spindles lack an efficient rapid tool advance and retreat design, which increases the processing time and reduces the processing efficiency. Summary of the invention

[0003] The object of the present invention is to provide an electric spindle with short span and fast tool retraction to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an electric spindle with short span and fast retraction, comprising an inner shell, a stator is fixedly connected inside the inner shell, a rotor is sleeved inside the stator, a core shaft is fixedly connected inside the rotor, a pull rod is slidably connected inside the core shaft, one end of the inner shell is fixedly connected to a rear bearing seat, one end of the rear bearing seat is fixedly connected to a flange plate, a hydraulic cylinder is fixedly connected to the flange plate, and the output end of the hydraulic cylinder is fixedly connected to the pull rod.

[0005] Furthermore, a first flow channel is provided on the outer wall of the inner shell, and the outer shell is fixedly connected to the inner shell.

[0006] Furthermore, a plurality of dynamic balancing rings are fixedly connected to the core shaft, and the dynamic balancing rings are arranged at both ends of the rotor, an encoder ring is fixedly connected to one end of the core shaft, and a nut is threadedly connected to the other end of the core shaft.

[0007] Furthermore, a third spacer ring is sleeved on the core shaft, front bearings are arranged on both sides of the third spacer ring, and the front bearings are installed on the core shaft, a sealing ring is arranged on one side of one of the front bearings, and the sealing ring is arranged on one side of the nut.

[0008] Furthermore, an end cover is sleeved on the nut, a front bearing seat is fixedly connected to the end cover, and the front bearing seat is fixedly connected to the other end of the inner shell, a positioning ring is sleeved in the front bearing seat, and the positioning ring is sleeved on the sealing ring, a second spacer ring is arranged in the front bearing seat, and the second spacer ring is sleeved on the third spacer ring, and a second flow channel is arranged in the second spacer ring.

[0009] Furthermore, a rear bearing is installed on the core shaft, an adjustment ring is provided on one side of the rear bearing, a limit ring is provided on the other side of the rear bearing, and the limit ring and the adjustment ring are both threadedly connected to the core shaft, a first spacer ring is sleeved on the limit ring, a rear bearing chamber is fixedly connected to the first spacer ring, and the rear bearing is sleeved in the rear bearing chamber, and the rear bearing chamber is slidably connected in the rear bearing seat.

[0010] Furthermore, a linear bearing is fixedly connected to the rear bearing chamber, and the linear bearing is fixedly connected to the rear bearing seat.

[0011] The invention provides an electric spindle with short span and fast retraction, which has the following advantages: the invention integrates the front and rear bearings originally located outside the motor and places them inside the motor, thereby effectively shortening the support span of the core shaft, thereby reducing the rotation angle deviation of the core shaft caused by the force during operation, greatly improving the rotation accuracy and stability of the electric spindle, and improving the processing accuracy; the pull rod in the core shaft is driven by a three-chamber double-piston pressurized hydraulic cylinder, which can move faster than the double-chamber single-piston hydraulic cylinder on the traditional electric spindle, thereby realizing the fast advance and retraction operation of the tool, thereby shortening the non-cutting time in the processing process and improving the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of the electric spindle of the present invention;

[0014] Figure 2 It is a two-angle isometric drawing;

[0015] Figure 3 It is a schematic diagram of the overall front view cutaway structure of the present invention;

[0016] Figure 4 for Figure 3 A magnified view of the structure in the middle A area;

[0017] Figure 5 for Figure 3 A magnified view of the structure in region B.

[0018] In the figure: 1, inner housing; 11, first flow channel; 12, outer housing; 13, stator; 14, rear bearing seat; 15, linear bearing; 16, rear bearing chamber; 17, flange plate; 18, first spacer ring; 19, front bearing seat; 110, second spacer ring; 111, second flow channel; 112, end cover; 2, hydraulic cylinder; 21, hydraulic cylinder head; 22, first piston; 23, sealing ring; 24, second piston; 25, limit switch; 26, hydraulic cylinder body; 27, sealing ring; 28, first oil chamber; 29, second oil chamber; 210, third oil chamber; 3, pull rod; 31, core shaft; 32, encoder ring; 33, third spacer ring; 34, front bearing; 35, sealing ring; 36, positioning ring; 37, nut; 38, rear bearing; 39, adjusting ring; 310, limit ring; 311, rotor; 312, dynamic balancing ring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Please see attached Figure 1 -Attached Figure 5An embodiment of the present invention is as follows: an electric spindle with a short span and fast tool retraction comprises an inner housing 1, a stator 13 is fixedly connected in the inner housing 1, a rotor 311 is sleeved in the stator 13, a core shaft 31 is fixedly connected in the rotor 311, a pull rod 3 is slidably connected in the core shaft 31, one end of the inner housing 1 is fixedly connected to a rear bearing seat 14, one end of the rear bearing seat 14 is fixedly connected to a flange plate 17, a hydraulic cylinder 2 is fixedly connected to the flange plate 17, and an output end of the hydraulic cylinder 2 is fixedly connected to the pull rod 3, the stator 13 is used to generate a magnetic field, and the rotor 311 is used to drive the core shaft 31 The flange plate 17 is used to connect the rear bearing seat 14 and the hydraulic cylinder 2, and the hydraulic cylinder 2 is used to drive the pull rod 3; a first flow channel 11 is provided on the outer wall of the inner housing 1, and an outer housing 12 is fixedly connected to the inner housing 1, and the inner housing 1 and the outer housing 12 constitute the outer housing part of the motor; a plurality of dynamic balancing rings 312 are fixedly connected to the core shaft 31, and the dynamic balancing rings 312 are arranged at both ends of the rotor 311, one end of the core shaft 31 is fixedly connected to the encoder ring 32, and the other end of the core shaft 31 is threadedly connected to the nut 37, and the dynamic balancing ring 312 is used to improve the stability of the rotation of the core shaft 31, and the encoder ring 32 is used to cooperate with the encoder to monitor the rotation speed of the spindle 31; the spindle 31 is sleeved with a third spacer ring 33, and front bearings 34 are arranged on both sides of the third spacer ring 33, and the front bearings 34 are installed on the spindle 31, and a sealing ring 35 is arranged on one side of one of the front bearings 34, and the sealing ring 35 is arranged on one side of the nut 37, the front bearing 34 is used to assist the spindle 31 to rotate, the third spacer ring 33 is used to separate the two front bearings 34, the sealing ring 35 is used to prevent the front bearing 34 from leaking oil, and the sealing ring 35 is limited by the nut 37; the nut 37 is sleeved with an end cover 112, and the end cover 112 is provided with a sealing ring 35. A front bearing seat 19 is fixedly connected, and the front bearing seat 19 is fixedly connected to the other end of the inner housing 1. A positioning ring 36 is sleeved in the front bearing seat 19, and the positioning ring 36 is sleeved on the sealing ring 35. A second spacer ring 110 is provided in the front bearing seat 19, and the second spacer ring 110 is sleeved on the third spacer ring 33. A second flow channel 111 is provided in the second spacer ring 110. The end cover 112 is used to close the inner housing 1. The front bearing seat 19 is used to install the front bearing 34. The positioning ring 36 is used to position the outermost front bearing 34. The second spacer ring 110 is used to separate the two front bearings 34.A rear bearing 38 is installed on the spindle 31, an adjusting ring 39 is provided on one side of the rear bearing 38, a limiting ring 310 is provided on the other side of the rear bearing 38, and the limiting ring 310 and the adjusting ring 39 are both threadedly connected to the spindle 31, a first spacer ring 18 is sleeved on the limiting ring 310, a rear bearing chamber 16 is fixedly connected to the first spacer ring 18, and the rear bearing 38 is sleeved in the rear bearing chamber 16, and the rear bearing chamber 16 is slidably connected in the rear bearing seat 14, and the rear bearing 38 is used to assist the spindle 31 rotates, and the limiting ring 310 cooperates with the first spacer ring 18 to limit one side of the rear bearing 38, and the rear bearing chamber 16 cooperates with the adjusting ring 39 to limit the other side of the rear bearing 38. The limiting ring 310 cooperates with the adjusting ring 39 to adjust the position of the rear bearing 38; the rear bearing chamber 16 is fixedly connected with a linear bearing 15, and the linear bearing 15 is fixedly connected in the rear bearing seat 14, and the linear bearing 15 is used to assist the rear bearing chamber 16 to slide in the rear bearing seat 14. ;

[0021] Working principle: When assembling and using the present invention, the rear bearing 38 is installed in the rear bearing chamber 16, and then the first spacer ring 18 is installed in the rear bearing chamber 16, and the rear bearing chamber 16 is installed in the rear bearing seat 14 through the linear bearing 15, and the outer shell 12 is installed on the inner shell 1, and the stator 13 is installed in the inner shell 1, and the rear bearing seat 14 is installed at one end of the inner shell 1, and the rotor 311, the dynamic balance ring 312 and the adjustment ring 39 are installed on the mandrel 31, and then the rear bearing 38 is installed on the mandrel 31, and the limit ring 310 is installed on the mandrel 31, and the limit ring 310 is used to cooperate with the first spacer ring 18 to adjust the rear bearing. One side of the bearing 38 is limited, and the other side of the rear bearing 38 is limited by the rear bearing chamber 16 and the adjusting ring 39. One of the front bearings 34, the second spacer ring 110, the third spacer ring 33, and the other front bearing 34 are installed in the front bearing seat 19 in sequence, the sealing ring 35 is installed on the core shaft 31, the positioning ring 36 is installed on the sealing ring 35, the end cover 112 is installed on the front bearing seat 19, and the front bearing seat 19 is installed on the other end of the inner housing 1, and then the nut 37 is installed on the core shaft 31, the encoder ring 32 is installed on the core shaft 31, and the pull rod 3 is installed on the output end of the hydraulic cylinder 2. The hydraulic cylinder cover 27 is mounted on the hydraulic cylinder body 26, the limit switch 25 is mounted on the hydraulic cylinder cover 27, the first piston 22 is mounted on the hydraulic cylinder body 26, the sealing ring 27 is mounted on the first piston 22, the second piston 24 is mounted on the hydraulic cylinder body 26, and the sealing ring 23 is mounted on the second piston 24. When the pull rod 3 advances, the hydraulic oil is introduced into the first oil chamber 28 and the second oil chamber 29, and the hydraulic oil in the third oil chamber 210 is extracted. When the pull rod 3 retracts, the hydraulic oil is first introduced into the third oil chamber 210, and the hydraulic oil in the first oil chamber 28 and the second oil chamber 29 is extracted. When the first piston 22 passes through the hydraulic After the cylinder body 26 is positioned, hydraulic oil is introduced into the second oil chamber 29 and the hydraulic oil in the first oil chamber 28 is continuously extracted. The limit switch 25 is used to complete the positioning of the second piston 24. The hydraulic cylinder 2 is installed on the rear bearing seat 14 through the flange plate 17, so that the pull rod 3 is installed in the core shaft 31. After the assembly is completed, the hydraulic cylinder 2 can be used to drive the pull rod 3 to achieve the purpose of rapid advance and retraction of the tool. The inner shell 1 and the outer shell 12 constitute the outer shell part of the motor. The stator 13 is used to generate a fixed magnetic field so that the rotor 311 can drive the core shaft 31 to rotate after being energized. The first flow channel 11 and the second flow channel 111 are coolant flow channels.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric spindle with short span and fast retraction, comprising an inner housing (1), a front bearing (34), a rear bearing (38) and a hydraulic cylinder (2), characterized in that: The inner shell (1) is fixedly connected with a stator (13), the stator (13) is sleeved with a rotor (311), the rotor (311) is fixedly connected with a core shaft (31), the core shaft (31) is slidably connected with a pull rod (3), one end of the inner shell (1) is fixedly connected with a rear bearing seat (14), one end of the rear bearing seat (14) is fixedly connected with a flange plate (17), a hydraulic cylinder (2) is fixedly connected to the flange plate (17), and the output end of the hydraulic cylinder (2) is fixedly connected The front bearing (34) and the rear bearing (38) are built into the motor to shorten the overall span of the electric spindle. The hydraulic cylinder (2) has a pressurized structure. The pull rod (3) is installed at the output end of the hydraulic cylinder 2. The hydraulic cylinder cover (27) is installed on the hydraulic cylinder body (26). The limit switch (25) is installed on the hydraulic cylinder cover (27). The first piston (22) is installed on the hydraulic cylinder body (26). The sealing ring (27) is installed on the first piston. (22), the second piston (24) is mounted on the hydraulic cylinder body (26), the sealing ring (23) is mounted on the second piston (24), when the pull rod (3) advances, hydraulic oil is introduced into the first oil chamber (28) and the second oil chamber (29) and the hydraulic oil in the third oil chamber is extracted (210), when the pull rod (3) retracts, hydraulic oil is first introduced into the third oil chamber (210) and the hydraulic oil in the first oil chamber (28) and the second oil chamber (29) is extracted, when the first piston (2 2) After positioning is completed through the hydraulic cylinder body (26), hydraulic oil is introduced into the second oil chamber (29) and the hydraulic oil in the first oil chamber (28) is continuously extracted. The limit switch (25) is used to complete the positioning of the second piston (24). The hydraulic cylinder (2) is installed on the rear bearing seat (14) through the flange plate (17), so that the pull rod (3) is installed in the core shaft (31); after the assembly is completed, the hydraulic cylinder (2) can be used to drive the pull rod (3) to achieve the purpose of rapid advance and retraction of the tool.

2. The electric spindle with short span and fast tool retraction according to claim 1, characterized in that: A first flow channel (11) is provided on the outer wall of the inner shell (1), and an outer shell (12) is fixedly connected to the inner shell (1).

3. The electric spindle with short span and fast tool retraction according to claim 1, characterized in that: A plurality of dynamic balancing rings (312) are fixedly connected to the core shaft (31), and the dynamic balancing rings (312) are arranged at both ends of the rotor (311). One end of the core shaft (31) is fixedly connected to an encoder ring (32), and the other end of the core shaft (31) is threadedly connected to a nut (37).

4. The electric spindle with short span and fast tool retraction according to claim 3, characterized in that: The core shaft (31) is sleeved with a third spacer ring (33), front bearings (34) are arranged on both sides of the third spacer ring (33), and the front bearings (34) are installed on the core shaft (31), a sealing ring (35) is arranged on one side of one of the front bearings (34), and the sealing ring (35) is arranged on one side of the nut (37).

5. The electric spindle with short span and fast tool retraction according to claim 4, characterized in that: The nut (37) is sleeved with an end cover (112), the end cover (112) is fixedly connected with a front bearing seat (19), and the front bearing seat (19) is fixedly connected to the other end of the inner shell (1), a positioning ring (36) is sleeved in the front bearing seat (19), and the positioning ring (36) is sleeved on the sealing ring (35), a second spacer ring (110) is arranged in the front bearing seat (19), and the second spacer ring (110) is sleeved on the third spacer ring (33), and a second flow channel (111) is arranged in the second spacer ring (110).

6. The electric spindle with short span and fast tool retraction according to claim 4, characterized in that: A rear bearing (38) is installed on the core shaft (31), an adjusting ring (39) is arranged on one side of the rear bearing (38), a limiting ring (310) is arranged on the other side of the rear bearing (38), and the limiting ring (310) and the adjusting ring (39) are both threadedly connected to the core shaft (31), a first spacer ring (18) is sleeved on the limiting ring (310), a rear bearing chamber (16) is fixedly connected to the first spacer ring (18), and the rear bearing (38) is sleeved in the rear bearing chamber (16), and the rear bearing chamber (16) is slidably connected in the rear bearing seat (14).

7. The electric spindle with short span and fast tool retraction according to claim 6, characterized in that: A linear bearing (15) is fixedly connected to the rear bearing chamber (16), and the linear bearing (15) is fixedly connected to the rear bearing seat (14).

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