WO2008043267A1

WO2008043267A1 - A clamping chuck

Info

Publication number: WO2008043267A1
Application number: PCT/CN2007/002852
Authority: WO
Inventors: Hai Ren
Original assignee: Hai Ren
Priority date: 2006-10-10
Filing date: 2007-09-29
Publication date: 2008-04-17
Also published as: CN1937370A

Abstract

A clamping chuck (4) is directly integrated with a driving shaft (7) and an electric motor mechanism. The clamping chuck is supported in a rotatable manner on the driving shaft through a rotating bearing (11). A machine frame (9) of the primary stator of the external rotor of the rotating electric motor is fixed on the driving shaft and is disposed behind the clamping chuck. A primary stator annular body (1) is disposed on the machine frame, which faces a secondary rotor annular body (2) of the external rotor of the rotating electric motor, and an electromagnetic air gap (3) is formed between them. Advantages are: simple structure, compact, easy installation and maintenance.

Description

Machine tool chuck

The present invention relates to a machine tool component, and more particularly to an electromechanical machine tool chuck that closely combines a motor structure and a machine chuck structure. Background technique

In the traditional machine tool technology, whether it is a horizontal machine tool, a vertical machine tool, an automatic machine tool, a CNC machine tool, a frequency conversion machine tool, etc., there is a large and expensive machine tool spindle box, which is provided with a gear shifting gear set and a transmission shaft. , clutch, etc., to achieve the transmission and control of the speed and torque of the machine chuck. The spindle box has a complicated structure, a large volume, high processing precision, and low energy transfer efficiency, which makes the machine tool expensive and high in energy consumption, which makes the processing and manufacturing cost of the traditional machine tool product high.

In order to overcome the above-mentioned drawbacks of conventional machine tools, there has been a frequency conversion machine that does not use a complete headstock. Although the variable frequency machine greatly simplifies the structure of the headstock, the belt drive of the two pulleys and one belt is used to transmit the rotational torque of the motor to the machine chuck. The following defects still exist:

1. The rotating torque of the variable frequency machine tool is transmitted to the chuck through the belt drive. The drive shaft of the machine structure must include the motor shaft, two pulleys, belts and chucks, so that the volume of the machine tool is still large;

2. Due to the large number of components in the transmission chain, the requirements for manufacturing and assembly precision are high, which makes the manufacturing system of the machine tool higher;

3, belt drive efficiency is low, energy loss is large, so the frequency conversion machine is inefficient. Summary of the invention

The technical problem to be solved by the present invention is to provide a machine tool chuck that overcomes the above-mentioned drawbacks of the existing variable frequency machine tool.

The technical solution adopted by the present invention to solve the technical problem is to construct a machine tool chuck, comprising a frame 6, a machine tool spindle 7 fixedly connected to the frame, a bearing 11 and an axial positioning and vertical rotation support through the bearing a chuck 4 on the spindle of the machine tool, characterized in that: further comprising a rear end of the chuck An outer stator rotating electrical machine primary stator frame 9 on one side and fixedly connected to the machine tool spindle, a primary stator toroid body 1 disposed on the circumference of the primary stator frame, and a primary stator toroidal coil winding 13 connected thereto a power supply wire, the chuck including an extension portion 5 extending toward a rear end surface thereof and located outside the primary stator annular body, and a secondary rotor toroidal body 2 of an outer rotor rotating electrical machine disposed on an inner surface of the extension portion, The primary stator toroid is spaced from the secondary rotor annulus and forms an electromagnetic field air gap 3.

In the machine chuck of the present invention, the machine tool spindle 7 is a cylindrical hollow structure.

In the machine chuck of the present invention, the electromagnetic field air gap is formed between the chuck, the bearing, the chuck extension, the primary stator frame, the primary stator torus, the secondary rotor toroid and the machine tool spindle A closed confined space includes a compressed air tube that enters the confined space through the primary stator frame or the machine tool spindle or the air gap.

In the machine chuck of the present invention, a shallow groove is provided axially on the surface of the machine tool spindle, and the compressed air pipe enters the sealed space through the shallow groove.

In the machine chuck of the present invention, a plurality of air blowing nozzles disposed inside the sealed space, opening toward the electromagnetic field air gap and spaced along the circumference of the primary stator annular body, the air blowing nozzles are included The compressed air tubes are in communication.

In the machine chuck of the present invention, the axial positioning of the chuck on the spindle is achieved by positioning a positioning step on the spindle corresponding to the mounting position of the bearing, one end of the bearing and the positioning Positioning the step, the other end of the bearing is positioned by the axially positioned outer bearing end cap or is engaged with a limit nut threadedly engaged with the end of the spindle, the threaded screw of the limit nut is threaded with the card The disk rotates in the same direction.

In the machine chuck of the present invention, the axial positioning of the chuck on the main shaft is achieved by positioning a positioning ring corresponding to the bearing on the main shaft corresponding to the mounting position of the bearing, the bearing One end of the bearing is cooperatively positioned with the positioning ring, and the other end of the bearing is positioned by an axially positioned outer bearing end cap or is engaged with a limit nut threadedly engaged with the end of the spindle, and the threaded screw of the limit nut is threaded The direction of rotation is the same as that of the chuck.

In the machine chuck of the present invention, the axial positioning of the chuck on the main shaft is achieved by: positioning the bearing on the main shaft to the inner end of the bearing that is screwed to the main shaft a cover, the threaded end of the threaded end of the bearing is in the same direction of rotation as the chuck; one end of the bearing is positioned by the inner end cap of the bearing, and the other end of the bearing is axially positioned outside the bearing The end cap is positioned or mated with a limit nut threadedly engaged with the end of the spindle, the threaded rotation of the limit nut threading direction is the same as the direction of rotation of the chuck.

In the machine chuck of the present invention, the fixed connection structure of the primary stator frame and the main shaft is: the primary stator frame is integrally formed with the main shaft or the primary stator frame is detachably and fixedly connected. On the spindle.

The machine tool chuck embodying the present invention has the beneficial effects compared with the prior art:

1. By mechanically combining the motor structure and the chuck structure, the mechanical transmission chain between the motor and the chuck is omitted, the machine structure is greatly simplified, the machine tool volume is reduced, the manufacturing cost of the machine tool is reduced, and the raw material consumption is saved;

2. The output power of the motor directly reaches the chuck for workpiece processing, which greatly reduces the transmission loss of the motor output power, improves the useful power, which improves the power utilization efficiency of the machine tool, realizes energy saving and reduces the product of the machine tool. Processing cost;

3. The simplification of the machine structure greatly reduces the failure rate of the machine tool, improves the reliability of the machine tool, simplifies the use and maintenance of the machine tool, and reduces the use and maintenance costs. DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an embodiment of a machine chuck of the present invention.

In Fig. 1: 1 is the primary stator torus of the outer rotor rotating electrical machine; 2 is the secondary rotor torus of the outer rotor rotating electrical machine; 3 is the toroidal rotating electromagnetic field air gap space of the outer rotor rotating electrical machine; 4 is the machine tool Chuck; 5 is the extension of the outer casing edge of the machine chuck 4, 6 is the spindle frame (including the spindle frame base) installed at the end of the horizontal machine (or vertical machine); 7 is cylindrical a hollow main shaft fixedly mounted on the main shaft frame 6; 8 is a shallow groove provided on the outer surface of the main shaft 7, for laying a compressed air pipe and/or a power supply wire; 9 is a primary stator toroidal body of the outer rotor rotating electric machine 1 The inner ring is fastened to the connecting frame; 10 is the frame seat of the inner ring of the motor, and the ring is fastened to the frame 9; 11 is a bearing, and the machine chuck 4 is rotatably supported on the main shaft 7; Is the outer end cap of the bearing; 13 is the outer rotor rotating motor The motor coil winding of the primary stator torus 1; 14 is the inner ring inner plane of the machine chuck 4. detailed description

As shown in FIG. 1, the machine chuck of the present invention comprises a spindle frame 6 (including a frame base), a machine tool spindle 7 fixedly coupled to the spindle frame 6, a machine chuck 4, a bearing 11, and an outer rotor rotating motor. a primary stator frame 9 and a primary stator torus 1 disposed on the circumference of the primary stator frame 9. The machine chuck 4 is axially positioned by a bearing 11 and vertically rotatably supported on the spindle of the machine tool, the machine chuck 4 The rear end extends an extension portion 5 located outside the primary stator annular body 1, and a secondary rotor toroidal body 2 opposite to the primary stator annular body 1 and constituting the electromagnetic field air gap space 3 is disposed inside the extension portion 5, After the coil winding 13 of the primary stator annular body 1 is connected to the power source through a conductive wire (not shown), a rotating electromagnetic field moment is generated between the primary stator annular body 1 and the secondary rotor annular body 2, thereby pushing The machine chuck 4 rotates in the design direction.

The invention fully utilizes the relative rotational movement of the primary stator toroidal body of the outer rotor rotating electrical machine, the outer rotating annular body on the outer surface of the primary stator toroidal body and the rings of their respective torus bodies and their constituent rings The body electromagnetic field air gap space is a mechanical and physical characteristic parallel to its axis, which closely combines the motor structure with the machine tool spindle and chuck structure.

As shown in Fig. 1, the machine tool spindle 7 of the present embodiment adopts a cylindrical hollow spindle structure. In other embodiments, the machine tool spindle 7 can also adopt a solid shaft or the like.

The primary stator torus 1 of the outer rotor rotating electrical machine is fastened to the frame 9 by its inner ring, and the frame 9 is fixedly connected to the main shaft 7 by means of a conventional mechanical connection such as a pin or a key through the frame base 10. . Figure 1 shows only the structure of the frame 9 and the frame base 10. In the actual product design, the specific structure of the frame 9 and the frame base 10 can be a common frame and frame structure.

The connection between the frame 9 and the spindle 7 can be either an integrated unitary structure or a detachable fixed connection structure.

The machine chuck 4 basically adopts the existing chuck structure, and only the existing screw-to-spindle thread connection structure is replaced by a bearing 11, and the bearing 11 can adopt a rolling bearing or a sliding bearing. The machine chuck 4 is rotatably connected to the main shaft 7 through the bearing 11 and realizes positioning. The positioning method can adopt the following structure: a positioning step is set at the axial end of the main shaft 7 corresponding to the mounting position of the bearing 11 or an axially positioned annular pad is arranged. The sheet is used to position the bearing 11, and the inner end cap of the bearing 11 having the same direction of rotation as the chuck can be used to be screw-fitted with the spindle 7, and the outer end of the bearing 11 is positioned using the outer end cap 12 of the axially positioned bearing 11, or The positioning nut is matched with the limit nut threadedly engaged with the end of the main shaft 7. The threaded rotation of the limit nut thread is the same as the rotation direction of the chuck 4.

The secondary rotor toroidal body 2 of the outer rotor rotating electrical machine is fixedly attached to the extension portion 5 by means of a conventional pin, key, screw, etc., of course, it may be fixedly attached to the extension portion 5 by other means.

In this embodiment, in order to prevent other dust or debris from entering the electromagnetic field air gap space 3 and ensuring the running effect of the motor, the chuck 4, the bearing 11, the chuck extension portion 5, the primary stator frame 9, and the primary stator circle are A closed space with an electromagnetic field air gap space 3 as an opening is formed between the ring body 1, the secondary rotor toroid body 2 and the machine tool spindle 7, and a shallow groove 8 is provided on the main shaft 7, and a high pressure air pipe or a compressed air pipe is provided. It is introduced into the above-mentioned sealed space from the shallow groove 8, so that when compressed air flows out from the opening of the closed space, that is, the electromagnetic field air gap 3, dust or impurities can be prevented from entering the electromagnetic field air gap space 3 or Dust or impurities entering the electromagnetic field air gap 3 blow out the electromagnetic field air gap space 3.

In order to ensure a better protection effect, in the above-mentioned sealed space, a ring of high-pressure air or compressed air duct blowing nozzle is arranged along the edge of the outer surface of the main shaft 7 facing the annular body electromagnetic field air gap space 3 (in the figure) Not shown), in this way, the airflow blown by the blower nozzle can uniformly or reliably blow or block dust or impurities outside the electromagnetic field air gap space 3. In addition to being disposed around the outer surface of the main shaft 7, the blowing nozzle may be disposed in other structures and positions of the above-mentioned sealed space.

In other embodiments, the high pressure air or compressed air tube may be constructed to pass through the primary stator frame 9 or the machine tool spindle 7 or the electromagnetic field air gap space 3 into the enclosed space.

The energized wires of the primary stator torus 1 can also be mounted in the shallow slots 8. The shallow groove 8 can also be provided with a protective cover.

In other embodiments, compressed air may not be used to prevent dust or debris from entering the electromagnetic field air gap space 3, and a sealing device is provided outside the electromagnetic field air gap space 3 for the purpose.

In other embodiments, the chuck 4, the chuck extension 5, the primary stator frame 9, the primary stator torus 1, the secondary rotor torus 2, and the machine tool spindle 7 are preferred for applications where the environment is preferred. The object of the present invention can also be achieved without using a closed space structure.

The machine tool chuck of the invention realizes the activation of the chuck 4 by using the existing frequency conversion technology and voltage regulation technology. Controls such as moving, parking, high speed, low speed, forward rotation, reverse rotation, etc., enable the machine chuck 4 to obtain various rotational torques and rotational speeds required for machine tool operation.

The outer rotor rotating motor can be designed in a variety of sizes to match the various types of machine chucks 4 . When it is required to use a small power motor, a method of reducing the area of the annular space electromagnetic field air gap space 3, that is, reducing or thinning the volume of the motor core, may be used, that is, simultaneously reducing the primary stator toroidal body 1 and the secondary rotor circle of the motor. The method of reducing the number and thickness of the silicon steel sheet of the ring body 2; the method of reducing the diameter of the motor to reduce the area of the air gap space of the torus body can also be used, that is, the motor can be used in the secondary rotor torus 2 and the machine tool card. Between the extensions 5 of the outer circumference of the disk and between the inner ring planes 14 which are perpendicular to the rear side of the machine chuck and the machine tool spindle 7, a connection support frame for attaching the secondary rotor torus 2 of the motor is attached. , the motor secondary torus 2 is fixedly connected with the extension 5 of the outer casing of the machine chuck and the inner annular plane 14 perpendicular to the rear side of the machine chuck and the machine spindle 7 to form a solid whole body. The diameter and wire diameter of the primary stator coil winding 13 of the motor are correspondingly reduced. Conversely, when a high-power motor is required, the area of the annular space electromagnetic field air gap space 3 can be increased, that is, the motor core volume can be increased, that is, the motor primary is increased along the axis of the machine tool spindle 7 simultaneously. The number and thickness of the silicon steel sheets of the stator torus 1, the secondary rotor torus 2, and the diameter and the wire diameter of the primary stator coil winding 13 of the motor are simultaneously enlarged until the requirements for use are satisfied.

This embodiment is explained by taking the use of the machine chuck structure of the present invention on a horizontal machine tool as an example. In other embodiments, the machine chuck structure of the present invention can be utilized in a machine tool configuration of a vertical machine tool or other special design arrangement.

When the machine chuck structure of the invention is applied to a vertical machine tool, the vertical spindle 7 which is not rotated in the center of the vertical base, the spindle frame 6, the vertical base, the vertical working table and the circle between them can be fully utilized. The components such as the annular sliding guide rail can be designed to directly connect and fix the primary stator toroidal body 1 of the outer rotor rotating motor directly on the main shaft 7, and discard the headstock box next to the vertical base and the vertical working platform and the underside of the vertical working platform. The structure of the large ring gear and the like, according to the case where the diameter of the extension portion 5 of the outer side of the vertical workbench is much larger than the diameter of the motor secondary rotor torus 2, the motor secondary rotor torus 2 can be fixedly mounted. The inside of the torus or extension 5 for reinforcing the strength of the table in the middle position of the vertical workbench can also be used between the motor secondary rotor torus 2 and the extension 5 of the outer casing of the vertical table. And an inner annular plane 14 which is perpendicular to the inside of the vertical working platform and the main shaft 7 In addition, a connection support frame for connecting the secondary rotor torus 2 of the motor is attached, and the extension portion 5 of the motor secondary rotor torus 2 and the outer casing of the vertical workbench and the inside of the vertical workbench are provided. The inner ring planes 14 of the main shaft 7 are fixedly connected to form a solid whole, so that the electric motor driven secondary rotor torus 2 drives the vertical working table, that is, the vertical machine chuck and the workpiece rotation thereon jobs.

Claims

Claim

1. A machine chuck comprising a frame (6), a machine spindle (7) fixedly coupled to the frame, a bearing (11), and an axially positioned and vertically rotatably supported on the spindle of the machine tool by the bearing a chuck (4), further comprising: an outer stator rotating electrical machine primary stator frame (9) on a rear end side of the chuck and fixedly connected to the machine tool spindle, and disposed in the primary stator frame a primary stator torus (1) on the circumference and a supply conductor connecting the primary stator toroidal coil winding (13), the chuck including an extension extending to a rear end face thereof and located outside the primary stator toroid a portion (5) and a secondary rotor toroid (2) of an outer rotor rotating electrical machine disposed on an inner surface of the elongated portion, the primary stator annular body being spaced apart from the secondary rotor toroid and forming an electromagnetic field gas Gap (3).

A machine chuck according to claim 1, wherein: said machine tool spindle (7) is a cylindrical hollow structure.

3. The machine chuck of claim 1 wherein: said chuck, bearing, chuck extension, primary stator frame, primary stator torus, secondary rotor torus, and machine tool spindle A confined space is formed with the electromagnetic field air gap as an opening, and includes a compressed air tube that enters the confined space through the primary stator frame or the machine tool spindle or the air gap.

4. The machine chuck of claim 3, comprising: a shallow groove disposed axially on a surface of the machine tool spindle, the compressed air tube entering the closed space through the shallow groove.

5. The machine chuck of claim 3, comprising: a plurality of blows disposed inside the sealed space, the openings being oriented toward the electromagnetic field air gap and spaced along the circumference of the primary stator toroidal body a mouth, the blow nozzle is in communication with the compressed air tube.

6. The machine chuck according to any one of claims 1 to 5, characterized in that the axial positioning of the chuck on the spindle is achieved by the mounting position of the spindle corresponding to the bearing Positioning step is provided, one end of the bearing is cooperatively positioned with the positioning step, and the other end of the bearing is positioned by an axially positioned bearing outer end cover or is matched with a limit nut threadedly engaged with the spindle end, the limit The threaded engagement of the bit nut is the same as the direction of rotation of the chuck.

7. The machine chuck according to any one of claims 1 to 5, characterized in that the axial positioning of the chuck on the spindle is achieved by the mounting position of the spindle corresponding to the bearing Setting An axially positioned positioning ring, one end of the bearing and the positioning ring are cooperatively positioned, and the other end of the bearing is positioned by an axially positioned bearing outer end cover or is matched with a limit nut threadedly engaged with the spindle end portion. The threaded rotation of the limit nut thread is the same as the rotation direction of the chuck.

8. The machine chuck according to any one of claims 1 to 5, characterized in that the axial positioning of the chuck on the spindle is achieved by the mounting position of the spindle corresponding to the bearing Providing a bearing inner end cap threadedly coupled to the main shaft, the thread end of the threaded end cap of the bearing is rotated in the same direction as the rotation direction of the chuck; one end of the bearing is positioned by the inner end cover of the bearing, The other end of the bearing is positioned by the axially positioned outer end cap of the bearing or is engaged with a limit nut threadedly engaged with the end of the spindle, the threaded rotation of the limit nut is the same as the direction of rotation of the chuck .

The machine chuck according to any one of claims 1 to 5, wherein the primary stator frame and the main shaft are fixedly connected to each other: the primary stator frame and the main shaft are integral Forming or the primary stator frame is detachably and fixedly coupled to the spindle.