A two-stage spindle feed assembly

Abstract

This utility model discloses a two-stage spindle feed assembly, including a drive motor, which is fixed to a support bracket via a mounting flange. A drive pulley is fixedly mounted on the output end of the drive motor. The assembly also includes a mechanical spindle with a double-layer output shaft, mounted on one side of the bracket. The mechanical spindle includes an outer rotating shaft, within which an inner rotating shaft is sleeved. Sliding sleeves are fitted between the two ends of the outer and inner rotating shafts. Torque is transmitted between the outer and inner rotating shafts via splines. The inner rotating shaft can rotate synchronously and move axially. A driven pulley is fixedly connected to the power input end of the outer rotating shaft. A synchronous belt is installed between the drive pulley and the driven pulley. The outer rotating shaft is driven to rotate by the drive motor. An electric cylinder is fixedly connected to the rear end of the support bracket. This utility model can achieve a single-stage basic feed and a two-stage micro-feed, meeting the differentiated needs of roughing and finishing.

Description

Technical Field

[0001] This utility model relates to the field of spindle feed technology, specifically to a two-stage spindle feed assembly. Background Technology

[0002] A mechanical spindle is a core component in mechanical equipment used to transmit power, support rotating parts, and achieve precision motion. It is commonly found in machine tools, machining centers, lathes, and other equipment.

[0003] Currently, mechanical spindles on the market have only one output size and form, which are relatively fixed. In some specific environments, combination machine tools that need to grind and polish the machined surface or perform some non-standard actions often require multiple spindles to be used in combination. This results in low mechanical space utilization, inability to compress machine size, high manufacturing costs, and poor machine rigidity.

[0004] The utility model, filed on April 14, 2025, with application number 2025206968202 and entitled "A Mechanical Spindle with a Double-Layer Output Shaft," solves the aforementioned technical problems. It features an outer shaft and an inner shaft with the same rotational speed and direction of rotation, both of which can be equipped with grinding tools. This effectively improves machine space utilization, allows for the integration of more grinding heads, shortens machine length, and reduces costs.

[0005] To adapt to the aforementioned mechanical spindle with a dual-layer output shaft, this application provides a two-stage spindle feed assembly that can achieve a primary basic feed and a secondary micro-feed, meeting the differentiated needs of roughing and finishing. Utility Model Content

[0006] In order to overcome at least one of the technical problems existing in the prior art, this utility model provides a two-stage spindle feed assembly, which can realize a first-stage basic feed and a second-stage micro-feed to meet the differentiated needs of roughing and finishing.

[0007] A two-stage spindle feed assembly includes a drive motor, which is fixed to a support bracket via a mounting flange. A drive pulley is fixedly mounted on the output end of the drive motor. The assembly also includes a mechanical spindle with a double-layer output shaft, mounted on one side of the bracket. The mechanical spindle includes an outer shaft, within which an inner shaft is sleeved. Sliding sleeves are fitted between the two ends of the outer and inner shafts. Torque is transmitted between the outer and inner shafts via splines. The inner shaft can rotate synchronously and move axially. A driven pulley is fixedly connected to the power input end of the outer shaft. A drive pulley is positioned between the drive pulley and the driven pulley. A synchronous belt is installed between the inner and outer shafts, which are driven to rotate by a drive motor. An electric cylinder is fixedly connected to the rear end of the support bracket, and a feed shaft is fixedly installed at the output end of the electric cylinder, which is used to drive the inner shaft to move forward or backward axially. A bottom support is slidably connected to the bottom of the support bracket, and a feed motor is fixedly connected to one end of the bottom support. A drive shaft is fixedly installed at the output end of the feed motor, and a movable support is threadedly connected to the drive shaft. A support frame is fixedly connected to the bottom of the feed motor. The feed motor drives the drive shaft to rotate, which in turn drives the movable support and the support bracket to move forward or backward axially.

[0008] In some embodiments, the driving pulley and the driven pulley are arranged side by side, one above the other, with the driven pulley rotatably connected inside the support bracket and the feed shaft slidably connected inside the support bracket.

[0009] In some embodiments, the electric cylinder is located at the bottom of the drive motor, the feed shaft is located at the bottom of the drive motor, and the electric cylinder is located at the top of the feed motor.

[0010] In some embodiments, the movable support is fixedly connected to the bottom of the bearing bracket, the bearing bracket is located at the top of the drive shaft, and the support frame is fixedly connected to the bottom of the bottom support.

[0011] In some embodiments, the movable support is located inside the bottom support, the drive shaft is located at the top of the bottom support, and the feed motor is located at the bottom of the support bracket.

[0012] In some embodiments, the support is located at the bottom of the electric cylinder, and the bottom support is located at the bottom of the mechanical spindle.

[0013] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0014] When the feed motor is working, it drives the transmission shaft to rotate, and at the same time drives the moving support, the bearing bracket and the mechanical spindle to move forward or backward along the axis, so as to realize the first-level basic feed.

[0015] When the electric cylinder is working, the feed axis can move forward or backward along the axial direction. The feed axis can drive the inner rotating shaft to move forward or backward along the axial direction through a magnetic coupling feed mechanism or other feed mechanisms to achieve two-stage micro-feed.

[0016] This application can meet the differentiated needs of roughing and finishing, has a reasonable structural design, small size, and occupies little space.

[0017] Additional aspects and advantages of this invention will continue to be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of this invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a top-view three-dimensional structural diagram of this application;

[0020] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0021] Figure 3 This is a bottom-view three-dimensional structural diagram of this application;

[0022] Figure 4 This is a schematic diagram of the front view structure of this application;

[0023] Figure 5 This is a top-view planar structural diagram of the mechanical spindle;

[0024] Figure 6 This is a cross-sectional structural diagram of a mechanical spindle.

[0025] Figure label:

[0026] 1. Drive motor; 2. Support bracket; 3. Drive pulley; 4. Driven pulley; 5. Synchronous belt; 6.

[0027] Mechanical spindle 5, outer rotating shaft 50, inner rotating shaft 51, sliding sleeve 52, spline 53, grinding wheel 54, magnetic coupling feed mechanism 55;

[0028] 6. Electric cylinder; 7. Feed shaft; 8. Bottom support; 9. Feed motor; 10. Drive shaft

[0029] 10. Movable support; 11. Support frame; 12. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Reference Figures 1-6A two-stage spindle feed assembly includes a drive motor 1, which is fixed to a support bracket 2 via a mounting flange. A drive pulley 3 is fixedly mounted on the output end of the drive motor 1. The assembly also includes a mechanical spindle 5 with a double-layer output shaft, which can adopt the same structure as the utility model with application number 2025206968202. The mechanical spindle 5 is mounted on one side of the support bracket 2 and includes an outer rotating shaft 50, an inner rotating shaft 51 sleeved inside the outer rotating shaft 50, and a sliding sleeve 52 sleeved between the two ends of the outer rotating shaft 50 and the inner rotating shaft 51. A spline 53 engages with a spline groove. The spline 53 and the spline groove, through a multi-tooth meshing mechanical structure, achieve core functions such as torque transmission, synchronous rotation, and axial sliding in the motor shaft drive. Torque is transmitted between the outer rotating shaft 50 and the inner rotating shaft 51 via the spline 53. The inner shaft 51 can rotate synchronously and move axially. The power input end of the outer shaft 50 is fixedly connected to the driven pulley 4. A synchronous belt 340 is installed between the driving pulley 3 and the driven pulley 4. The outer shaft 50 is driven to rotate by the drive motor 1. The rear end of the bearing bracket 2 is fixedly connected to the electric cylinder 6. The output end of the electric cylinder 6 is fixedly installed with the feed shaft 7, which is used to drive the inner shaft 51 to move forward or backward axially. The bottom of the bearing bracket 2 is slidably connected to the bottom support 8. One end of the bottom support 8 is fixedly connected to the feed motor 9. The output end of the feed motor 9 is fixedly installed with the transmission shaft 10. The transmission shaft 10 is threadedly connected to the movable support 11. The bottom of the feed motor 9 is fixedly connected to the support frame 12. The feed motor 9 drives the transmission shaft 10 to rotate, and at the same time drives the movable support 11 and the bearing bracket 2 to move forward or backward axially.

[0035] When the drive motor 1 is working, it drives the driven pulley 4 and the outer shaft 50 to rotate synchronously through the driving pulley 3 and the synchronous belt. The outer shaft 50 and the inner shaft 51 transmit torque through the spline 53, so that the outer shaft 50 and the inner shaft 51 rotate synchronously. A grinding wheel 54 is installed at the output end of the outer shaft 50 and the inner shaft 51. The two grinding wheels 54 are concentrically set, which can effectively improve the space utilization of the machine, allow more grinding heads to be integrated into the machine, shorten the machine, and reduce costs.

[0036] When the feed motor 9 is working, it drives the transmission shaft 10 to rotate, and at the same time drives the movable support 11, the bearing bracket 2, and the mechanical spindle 5 to move forward or backward along the axis, so as to realize the first-level basic feed.

[0037] When the electric cylinder 6 is working, the feed axis 7 can move forward or backward along the axial direction. The feed axis 7 can be combined with the magnetic coupling feed mechanism 55 or other feed mechanisms to drive the inner rotating shaft 51 to move forward or backward along the axial direction, so as to realize two-stage micro-feed. The above structural design can meet the differentiated needs of roughing and finishing.

[0038] Specifically, the magnetic coupling feed mechanism 55 includes a feed shaft 7 coaxially arranged alongside the inner rotating shaft. Both the inner rotating shaft and the feed shaft have corresponding ball grooves on their respective end faces, with a ball placed inside each groove. A pressure cap is fitted onto the outer wall of both the inner rotating shaft and the feed shaft at their respective ends, maintaining a non-contact state between the two pressure caps. A ball hole is formed on each pressure cap, corresponding to the ball groove. The pressure cap restricts the ball within the area between the ball groove and the ball hole, with portions of the outer walls of the two balls protruding outside the ball hole and contacting each other. A magnet with opposite magnetic polarity is installed at each end of the two pressure caps, maintaining a non-contact state between the two magnets. The two balls roll in contact under the restriction of the ball groove and the ball hole, transmitting rotational motion while allowing axial displacement. The opposite-polarity magnets generate an attractive force; when the feed shaft moves axially, the magnetic force pulls the inner rotating shaft to feed synchronously axially, achieving contactless force transmission and avoiding mechanical wear.

[0039] In some embodiments, the driving pulley 3 and the driven pulley 4 are arranged side by side, which is a reasonable structural design and facilitates the installation of the synchronous belt 340; the input end of the outer rotating shaft 50 extends into the interior of the bearing bracket 2, and the driven pulley 4 is rotatably connected to the interior of the bearing bracket 2, so that the driving pulley 3 and the driven pulley 4 are arranged side by side, and the feed shaft 7 is slidably connected to the interior of the bearing bracket 2.

[0040] In some embodiments, the electric cylinder 6 is located at the bottom of the drive motor 1, the feed shaft 7 is located at the bottom of the drive motor 1, and the electric cylinder 6 is located at the top of the feed motor 9. The structure is reasonably distributed, which can reduce the size of the whole machine.

[0041] In some embodiments, the movable support 11 is fixedly connected to the bottom of the bearing bracket 2, the bearing bracket 2 is located at the top of the drive shaft 10, and the support frame 12 is fixedly connected to the bottom of the bottom support 8. The structure is reasonably distributed, which can reduce the size of the whole machine.

[0042] In some embodiments, the movable support 11 is located inside the bottom support 8, the drive shaft 10 is located at the top of the bottom support 8, and the feed motor 9 is located at the bottom of the support bracket 2. The drive shaft 10 can adopt a double-sided nut pre-tightening structure, which, together with the limiting groove of the movable support 11, ensures that the feed accuracy can still be maintained after long-term operation. The movable support 11 is slidably connected to the support bracket 2, and the contact pressure can be automatically adjusted according to the processing resistance to extend the service life of the guide rail pair.

[0043] In some embodiments, the support 12 is located at the bottom of the electric cylinder 6, and the bottom support 8 is located at the bottom of the mechanical spindle 5.

[0044] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A two-stage spindle feed assembly comprising a drive motor (1), characterized by: The drive motor (1) is fixed to the support bracket (2) by a mounting flange. The output end of the drive motor (1) is fixedly mounted with a drive pulley (3). It also includes a mechanical spindle (5) with a double-layer output shaft. The mechanical spindle (5) is mounted on one side of the bracket (2). It includes an outer rotating shaft (50). An inner rotating shaft (51) is sleeved inside the outer rotating shaft (50). A sliding sleeve (52) is sleeved between the two ends of the outer rotating shaft (50) and the inner rotating shaft (51). Torque is transmitted between the outer rotating shaft (50) and the inner rotating shaft (51) through a spline (53). The inner rotating shaft (51) can rotate synchronously and move axially. The power input end of the outer rotating shaft (50) is fixedly connected with a driven pulley (4). A synchronous belt (340) is installed between the drive pulley (3) and the driven pulley (4). The outer rotating shaft (50) is driven to rotate by the drive motor (1); the rear end of the bearing bracket (2) is fixedly connected to the electric cylinder (6), and the output end of the electric cylinder (6) is fixedly installed with the feed shaft (7), which is used to drive the inner rotating shaft (51) to move forward or backward along the axial direction; the bottom of the bearing bracket (2) is slidably connected to the bottom support (8), one end of the bottom support (8) is fixedly connected to the feed motor (9), the output end of the feed motor (9) is fixedly installed with the transmission shaft (10), the transmission shaft (10) is threadedly connected to the movable support (11), and the bottom of the feed motor (9) is fixedly connected to the support frame (12); the feed motor (9) drives the transmission shaft (10) to rotate, and at the same time drives the movable support (11) and the bearing bracket (2) to move forward or backward along the axial direction.

2. The two-stage spindle feed assembly of claim 1, wherein: The driving pulley (3) and the driven pulley (4) are arranged side by side, one above the other. The driven pulley (4) is rotatably connected inside the support bracket (2), and the feed shaft (7) is slidably connected inside the support bracket (2).

3. The two-stage spindle feed assembly of claim 2, wherein: The electric cylinder (6) is located at the bottom of the drive motor (1), the feed shaft (7) is located at the bottom of the drive motor (1), and the electric cylinder (6) is located at the top of the feed motor (9).

4. The two-stage spindle feed assembly of claim 3, wherein: The movable support (11) is fixedly connected to the bottom of the bearing bracket (2), the bearing bracket (2) is located at the top of the drive shaft (10), and the support frame (12) is fixedly connected to the bottom of the bottom support (8).

5. The two-stage spindle feed assembly of claim 4, wherein: The movable support (11) is located inside the bottom support (8), the drive shaft (10) is located at the top of the bottom support (8), and the feed motor (9) is located at the bottom of the support bracket (2).

6. The two-stage spindle feed assembly of claim 5, wherein: The support frame (12) is located at the bottom of the electric cylinder (6), and the bottom support (8) is located at the bottom of the mechanical spindle (5).

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