CN107052916A - A kind of grinding machine self-centering self-lock chuck - Google Patents

Abstract

The invention belongs to the technical field of machinery, and specifically refers to a self-centering and self-locking chuck for a grinding machine, which includes an outer shell with a cavity and a thimble pierced in the outer shell; The shell can rotate freely; the upper end surface of the inner shell is provided with an annular boss, and three cores for clamping the workpiece are evenly distributed on the upper end surface of the annular boss, and the heads of the cores are hinged on the ring On the boss, the tail of the core is provided with a pre-tightening spring, and the inner shell is provided with a bushing that is socketed with the thimble, and the bushing is only free to rotate in the same direction relative to the inner shell; The purpose is to provide a self-centering and self-locking chuck of a grinding machine with a simple structure.

Description

A self-centering self-locking chuck for a grinding machine

technical field

The invention belongs to the technical field of machinery, and specifically refers to a self-centering and self-locking chuck of a grinding machine.

Background technique

Cylindrical grinder is a kind of grinding machine mainly used for grinding cylindrical and conical outer surfaces. When working, the power source is started, and the grinding wheel located at one end of the horizontal slide table of the fuselage rotates and feeds, and at the same time, the grinding wheel located at the other end The workpiece starts to rotate under the drive of another power source, so that the grinding wheel performs plunge grinding on the workpiece.

Existing cylindrical grinders usually use a chicken core chuck with a power clamping mechanism and a loosening mechanism. When grinding bar materials, the elastic screws of the chuck are usually used to fix the workpiece. After the workpiece is clamped by the two tops, the grinding machine When the grinding head lever rotates, it drives the chicken core chuck lever to rotate, and the chicken core chuck lever then drives the workpiece to rotate the grinding wheel to feed the tool, so as to realize the outer cylindrical grinding of the workpiece. After grinding a bar, the chicken core needs to be loosened. The chuck screw can be used to remove the workpiece. This type of chicken core chuck not only has a complex internal structure, but also requires manual loading and unloading for assembly, which is time-consuming and laborious. At the same time, when fixing the workpiece, the chuck screw must be tightened outside the machine tool, which greatly increases the labor intensity of the workers and reduces the production efficiency. Very low, increasing production costs.

Contents of the invention

In order to overcome the defects in the prior art, the object of the present invention is to provide a self-centering and self-locking chuck of a grinding machine with a simple structure.

The purpose of the present invention is achieved like this:

A self-centering and self-locking chuck for a grinder, comprising an outer shell with a cavity and a thimble passing through the outer shell; an inner shell is set inside the outer shell, and the outer shell and the inner shell can rotate freely; the inner shell An annular boss is arranged on the upper end surface of the annular boss, and three cores for clamping the workpiece are evenly distributed on the upper end surface of the annular boss, the head of the core is hinged on the annular boss, and the cores are A pre-tension spring is provided at the tail, and a bushing that is socketed with the thimble is arranged inside the inner shell, and the bushing only rotates freely in the same direction relative to the inner shell.

After adopting the above structure, the rotation of the workpiece drives the rotation of the shaft sleeve fixed with the thimble, and the pre-clamping of the workpiece is realized through the three cores and the pre-tension spring, so that the three cores can fix the workpiece during the rotation process. Centering, when the core does not float when the workpiece rotates, the workpiece is clamped and processed to realize the self-centering and self-locking function; otherwise, the thimble is reversed, so that the shaft sleeve and the inner shell rotate in the same direction, so that the core faces the pre-tension spring Rotate in the opposite direction of the pulling force, so that the core is in a loose state, and the workpiece can be taken and installed.

The present invention is further provided that: the shaft sleeve and the inner shell are connected through a one-way bearing.

After the above structure is adopted, the one-way rotation between the shaft sleeve and the inner shell is facilitated, and the installation and replacement are also convenient.

The present invention is further provided that: the tail of the core is provided with an annular groove, and the outer shell is provided with a limiting rod, and the limiting rod moves in the annular groove.

After adopting the above-mentioned structure, the rotation position of the core is limited through the cooperation of the limit rod and the annular groove, so as to prevent the core from causing excessive clamping force on the workpiece, thereby causing the core to lose its self-centering function.

The present invention is further provided that: one end of the pre-tension spring is connected to the tail of the core, and the other end of the pre-tension spring is connected to the annular boss.

After adopting the above-mentioned structure, the pre-tightening spring is in a pre-clamped state through a simple connection structure, so that the core can always lock the workpiece during processing.

The present invention is further provided that: the outer shell and the inner shell are connected through bearings.

After the above-mentioned structure is adopted, the rotation of the inner shell is facilitated, excessive shaking during rotation is avoided, and machining accuracy is ensured.

The present invention is further provided that: the head of the core is arranged in a cam shape.

After adopting the above structure, it is convenient to abut and clamp the workpiece.

The present invention is further configured as follows: the annular boss is provided with a mounting groove, and the head of the core rotates in the mounting groove.

After adopting the above structure, the installation is simple and convenient, and the installation in wrong direction can be avoided during installation.

The present invention is further configured as follows: the tail end of the core is provided with a wrench portion protruding outward, and the side wall of the wrench portion is arranged in a circular arc.

After adopting the above structure, the setting of the wrench part facilitates the control of the core. When the core needs to be opened, it can be operated through the wrench part, and the setting of the arc prevents it from being scratched during use.

The present invention is further configured as follows: the end face cover of the outer shell is provided with an outer shell cover, and the upper cover of the inner shell is provided with an inner shell cover.

After adopting the above structure, the internal parts can be protected and the service life of the product can be increased.

In the present invention, it is further provided that: the two ends of the one-way bearing are respectively provided with snap springs, and the snap springs axially fix the one-way bearing.

After adopting the above structure, it is convenient for the circlip to fix the one-way bearing in the axial direction, preventing the one-way bearing from moving axially during rotation, making the rotation more stable and improving the machining accuracy.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a sectional view of the present invention;

Fig. 3 is the structural representation of core of the present invention;

Fig. 4 is a schematic structural view of the annular boss of the present invention.

The meaning of the symbols in the figure:

1-outer shell; 2-thimble; 3-inner shell; 4-ring boss; 5-core; 6-pretension spring;

7-one-way bearing; 8-annular groove; 9-bearing; 10-cam shape; 11-installation groove; 12-wrench part;

13-shell cover; 14-inner shell cover; 15-circlip; 16-limit rod.

detailed description

The present invention will be further described below in conjunction with accompanying drawing with specific embodiment:

Referring to Figures 1 to 4, a self-centering self-locking chuck for a grinding machine includes a housing 1 with a cavity and a thimble 2 pierced in the housing 1; the housing 1 is sleeved with an inner housing 3. The outer shell 1 and the inner shell 3 can rotate freely; the upper end surface of the inner shell 3 is provided with an annular boss 4, and the upper end surface of the annular boss 4 is evenly distributed with three cores for clamping the workpiece 5. The head of the core 5 is hinged on the annular boss 4, and the tail of the core 5 is provided with a pre-tension spring 6. In this embodiment, one end of the pre-tension spring 6 is connected to the core 5 At the tail, the other end of the pre-tension spring 6 is connected to the annular boss 4. The pre-tension spring 6 is in a pre-clamped state through a simple connection structure, so that the core 5 always locks the workpiece during processing. Function: the inner shell 3 is provided with a bushing that is socketed with the thimble 2, and the bushing is only free to rotate in the same direction relative to the inner shell 3, and the bushing fixed to the thimble 2 is driven by the rotation of the workpiece to rotate. The pre-clamping of the workpiece is realized by the three cores 5 and the pre-tension spring 6. During the rotation of the workpiece, the three cores 5 center the workpiece. Clamping process realizes the function of self-centering and self-locking; on the contrary, the thimble 2 is reversed, so that the shaft sleeve and the inner shell 3 rotate in the same direction, so that the core 5 rotates in the opposite direction of the tension of the pre-tension spring 6, so that the core 5 In the loose state, the workpiece can be taken and installed.

In this embodiment, the shaft sleeve and the inner casing 3 are connected by a one-way bearing 7, which facilitates the one-way rotation between the shaft sleeve and the inner casing 3, and also facilitates installation and replacement.

It is further set as follows: the tail of the core 5 is provided with an annular groove 8, and the housing 1 is provided with a limit rod 16, the limit rod 16 moves in the annular groove 8, and passes through the gap between the limit rod 16 and the annular groove 8. In terms of cooperation, the rotation position of the core 5 is limited, so as to prevent the core 5 from causing excessive clamping force on the workpiece, and thus make the core 5 lose its self-centering function.

It is further configured that: the outer shell 1 and the inner shell 3 are connected through a bearing 9, so as to facilitate the rotation of the inner shell 3, avoid excessive shaking during rotation, and ensure machining accuracy.

It is further set as follows: the head of the core 5 is set in a cam shape 10, which is convenient for abutting and clamping the workpiece.

It is further set as follows: the annular boss 4 is provided with a mounting groove 11, the head of the core 5 rotates in the mounting groove 11, the installation is simple and convenient, and the wrong direction is avoided during installation.

It is further set as: the tail end of the core 5 is provided with an outwardly protruding wrench portion 12, the side wall of the wrench portion 12 is set in a circular arc, and the setting of the wrench portion 12 is convenient for controlling the core 5. When the core 5 is manually opened, it can be operated through the wrench part 12, and the setting of the arc prevents it from being scratched during use.

It is further set as follows: the end face cover of the outer shell 1 is provided with an outer shell cover 13, and the upper cover of the inner shell 3 is provided with an inner shell cover 14, which can protect internal parts and increase the service life of the product.

It is further set as follows: the two ends of the one-way bearing 7 are respectively provided with circlips 15, and the circlips 15 axially fix the one-way bearing 7. In this embodiment, the two ends of the bearing 9 are also provided with circlips 15 , to make it easier for the circlip 15 to axially fix the one-way bearing 7 and the circlip 15 to prevent the one-way bearing 7 and the bearing 9 from moving axially during rotation, so that the rotation is more stable and the machining accuracy is improved.

During operation, the rotation of the workpiece drives the shaft sleeve fixed to the thimble 2 to rotate, and the pre-clamping of the workpiece is realized through the three cores 5 and the pre-tightening spring 6, so that during the rotation of the workpiece, since the core 5 has a certain Swing space, and under the action of the pre-tension spring 6, the core 5 will swing with the rotation of the workpiece within the range of motion of the core 5 itself, that is, the three cores 5 center the workpiece, and when the workpiece rotates After the core 5 does not swing, the workpiece is processed to realize the function of self-centering and self-locking; on the contrary, the thimble 2 is reversed, so that the shaft sleeve and the inner shell 3 rotate in the same direction, and the core 5 is driven by the action of the one-way bearing 7. Rotate toward the opposite direction of pretension spring 6 pulling force, make the head of core 5 swing outward towards the center of annular boss 4, make core 5 be in unclamped state, workpiece can be taken and installed.

The foregoing embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made according to the structures, shapes and principles of the present invention shall be covered by the protection of the present invention. within range.

Claims (10)

1. A self-centering and self-locking chuck for a grinding machine, comprising a shell with a cavity and a thimble piercing through the shell; it is characterized in that: the shell is provided with an inner shell, and the shell and the inner shell can be freely Rotation; the upper end surface of the inner shell is provided with an annular boss, and three cores for clamping the workpiece are evenly distributed on the upper end surface of the annular boss, and the head of the core is hinged on the annular boss , The tail of the core is provided with a pre-tension spring, and the inner shell is provided with a bushing that is socketed with the thimble, and the bushing is only free to rotate in the same direction relative to the inner shell. 2. A self-centering self-locking chuck for a grinding machine according to claim 1, characterized in that: the bushing and the inner shell are connected by a one-way bearing. 3. A grinding machine self-centering self-locking chuck according to claim 1 or 2, characterized in that: the tail of the core is provided with an annular groove, and the outer shell is provided with a limit rod, the limit rod Activities in the ring groove. 4. A self-centering self-locking chuck for a grinder according to claim 1 or 2, characterized in that: one end of the pre-tension spring is connected to the tail of the core, and the other end of the pre-tension spring is connected to the annular protrusion tower. 5. A self-centering self-locking chuck for a grinding machine according to claim 4, characterized in that: the outer shell and the inner shell are connected by bearings. 6. A self-centering self-locking chuck for a grinding machine according to claim 1 or 5, characterized in that: the head of the core is arranged in a cam shape. 7. A self-centering self-locking chuck for a grinder according to claim 6, wherein a mounting groove is provided on the annular boss, and the head of the core rotates in the mounting groove. 8. A self-centering self-locking chuck for grinding machines according to claim 7, characterized in that: the tail end of the core is provided with a wrench protruding outward, and the side wall of the wrench is an arc set up. 9. A self-centering self-locking chuck for a grinding machine according to claim 8, characterized in that: the end face cover of the outer shell is provided with an outer shell cover, and the upper cover of the inner shell is provided with an inner shell cover. 10. A grinding machine self-centering self-locking chuck according to claim 1 or 9, characterized in that: the two ends of the one-way bearing are respectively provided with snap springs, and the snap springs pivot the one-way bearing. to fix.