CN1857837A - Electric chuck unit - Google Patents

Abstract

The utility model relates to an electric chuck device, which relates to a kind of universal fixture widely used in the mechanical field for clamping workpieces. The invention is composed of an electric chuck device clamping function unit, an electric chuck device power function unit, an electromagnetic friction clutch assembly, a chuck body shell, an electromagnetic brake assembly and the like. When the electromagnetic brake component is energized, the clamping functional unit of the electric chuck device is connected with the bedside box and does not rotate; the electromagnetic friction clutch component is energized, and the power functional unit of the electric chuck device transmits the rotational motion to the jaws to clamp or loosen. Open the workpiece. During processing, only the clamping functional unit of the electric chuck device rotates with the main shaft, while the power functional unit of the electric chuck device does not rotate with the main shaft. Compared with the prior art, the present invention effectively reduces the number of parts rotating with the main shaft and the quality of the rotation, is beneficial to improve the quality of the dynamic balance of the main shaft, is easy to serialize and standardize design and manufacture, has a simple and compact device structure, and is convenient for installation and maintenance.

Description

Electric Chuck Device

technical field

The invention relates to a general fixture for clamping workpieces widely used in the mechanical field.

Background technique

Power chucks are often used on CNC lathes and automatic lathes. In addition to hydraulic power chucks and pneumatic power chucks, electric chucks are also widely used. At present, the structure of most electric chucks is as follows: the chuck body is installed at the front end of the main shaft of the lathe, and the motor is installed at the rear end of the main shaft. Can clamp and loosen the workpiece. Patent WO9951380 discloses an electric chuck device. A harmonic gear reducer is installed in the chuck body at the front end of the main shaft of the lathe, and an electric power unit is installed at the rear end of the main shaft, including a motor and an electromagnetic clutch. connected by a hollow shaft. During the machining process, the chuck body, reducer, hollow shaft, main shaft and motor rotor rotate as a whole. Since many components rotate with the lathe spindle at high speed, there are problems such as dynamic balance. At the same time, its complex structure is difficult to install and maintain.

Contents of the invention

The invention proposes an electric chuck device in order to overcome the deficiencies of the prior art, such as dynamic balance, complicated structure, difficult installation and maintenance.

In order to achieve the purpose of the invention, the present invention proposes a technical solution for the electric chuck device, which mainly includes: a chuck seat 3 connected to the main shaft 1, a coil wire 22, a chuck end cover 28, and a chuck installed on the chuck end cover 28. Claws 23 and the like constitute the clamping functional unit of the electric chuck device; the chuck motor (not shown) connected with the gear 8, the external meshing gear pair 7, 8, and the internal meshing gear pair 11 and 13 with small tooth difference constitute the electric chuck Device power functional unit; and electromagnetic friction clutch assemblies 12, 19, 20, 21, 32, 33; chuck body shell 10 and electromagnetic brake assemblies 16, 17, 34, etc. When the electromagnetic brake component is energized, the clamping functional unit of the electric chuck device is connected with the chuck body shell and the bedside box as a whole and does not rotate; at the same time, the electromagnetic friction clutch component is energized, and the power functional unit of the electric chuck device transmits the rotational movement When the coil is fed, the claws move up and down under the action of the thread rotation on the end surface, clamping or loosening the workpiece. Afterwards, the electromagnetic brake assembly and the electromagnetic friction clutch assembly are powered off, and the clamping functional unit of the electric chuck device rotates with the main shaft, while the power functional unit of the electric chuck device does not rotate with the main shaft.

Compared with the prior art, the present invention has the technical effect of effectively reducing the number of parts that rotate with the main shaft and the quality of the rotation, which is conducive to improving the quality of the dynamic balance of the main shaft, simplifying the influencing factors in the design of the main shaft, and facilitating serialization and standardized design and manufacture. , The structure of the device is simple and compact, easy to install and maintain.

Description of drawings

Figure 1 is a diagram of the electric chuck device.

Figure 2 is a front view of the chuck end cover.

Figure 3 is a sectional view of the end cover of the chuck.

Figure 4 is a rear view of the chuck end cover.

Figure 5 is a front view of the wire coil.

Fig. 6 is a sectional view of the coil wire.

In Figure 1:

1-Machine tool spindle 2-Spindle housing 3-Chuck seat

4, 6-bearing set 5-spacer ring 7-gear with eccentric shaft

8-Input gear 9-Coupling screw 10-Chuck body shell

11-Internal gear 12-Power supply slip ring set 13-External gear

14-Bearing 15-Fastening ring 16-Electromagnet group

17-brake ring 18-permanent magnet set 19-friction plate set

20-Pressure ring 21-Electromagnet group 22-Coil wire

23-Claw 24-Bearing 25-Pressure ring

26, 27-Coupling screw group 28-Chuck end cover 29, 30-Bearing group

31-Space ring 32-Guide screw group 33-Return spring group

34-guide pin set 35, 37-bearing set 36-spacer ring

38-pressure ring

Detailed ways

In the structure shown in Figure 1, when the chuck clamps (or loosens) the workpiece, the electromagnetic brakes 16, 17, 34 are energized and act and brake, that is, the electromagnet group 16 is energized and the brake ring 17 is attracted, so that The chuck body shell 10, the chuck end cover 28, the chuck seat 3, and the main shaft 1 are connected as one and do not rotate; at this time, when the chuck motor (not shown) connected with the gear 8 rotates, the external meshing gear pair 7 , 8 moves according to the transmission ratio, and the gear 7 is used as an input part and transmits the motion to the internal gear 11 through the gear 13 installed on its eccentric shaft; at the same time, the slip ring 11 is powered, and the electromagnetic friction clutch assembly 12, 19, 20 , 21, 32, 33 are energized and act, that is, the electromagnet 21 is energized to absorb the pressure ring 20 and press the friction plate group 19, and the coil wire 22 rotates synchronously with the internal gear 11; while the chuck end cover 28 does not rotate and is installed on the chuck end The claws 23 on the T-shaped groove in the cover 28 move up and down under the action of the threaded rotation of the end face to clamp or loosen the workpiece. When ready to process, the electromagnetic friction clutch assemblies 12, 19, 20, 21, 32, 33 are powered off, the pressure ring 20 is reset under the action of the return spring group 33 and the guide screw group 32, and the friction plates in the friction plate group 19 are disengaged contact, the coil wire 22 is disconnected from the internal gear 11; at the same time, the electromagnetic brakes 16, 17, 34 are powered off, the brake ring 17 is reset under the action of the permanent magnet group 18 and the guide pin group 34, and the chuck end cover 28, etc. Disconnect the connection with the chuck body shell 1; therefore, in the processing process, the main shaft 1, the chuck seat 3, the chuck end cover 28 and the claws 23, the disk wire 22 and the outer tooth friction plates in the friction plate group 19 are connected as One body, rotates together with the workpiece; and the chuck motor (not shown), the external meshing gear pair 7,8, the small tooth difference internal meshing gear pair 11,13, the internal tooth friction plate in the friction plate group 19, the pressure ring 20, The chuck body housing 10 etc. does not rotate with the spindle assembly.

The chuck seat 3 in the present invention is connected with the main shaft 1 through the connecting screw group 26, the chuck end cover 28 is connected with the chuck seat 3 through the connecting screw group 27, the coil wire 22 is supported on the chuck seat 3 by the bearing 24, and the chuck The pawl 23 is placed in the T groove on the chuck end cover 28 by its T-shaped key and is connected with the coil wire 22 by its end face thread. By unloading the connecting screw group 26 and the connecting screw group 9, the whole electric chuck device can be unloaded from the main shaft and the headstock as a whole.

The external meshing gear pair 7,8 among the present invention is supported on the chuck seat 3 by the bearing group 4,6, and the bearing group 4,6 is concentric with the main shaft, and one end of the gear 7 has a section of eccentric shaft and a section of concentric shaft.

The external gear 13 in the internal meshing gear pair 11 and 13 with few tooth differences in the present invention is supported on the eccentric shaft section of the gear 7 by the bearing 14, and transmits the motion to the internal gear 11 as an input end. The internal gear 11 is supported on the concentric shaft section of the gear 7 by bearing sets 29 , 30 .

The electromagnetic friction clutch assembly in the present invention includes: a power supply slip ring group 12 arranged on the internal gear 11, a friction plate group 19, a pressure ring 20, a group of uniformly distributed electromagnets 21, a group of uniformly distributed guide screws 32 and Return spring 33. When power is supplied through the slip ring 11, that is, the electromagnet group 21 is energized to absorb the pressure ring 20 and press the friction plate group 19, and the coil wire 22 rotates synchronously with the internal gear 11; when the power is cut off, the pressure ring 20 resets under the action of the spring group 33 , loosen the friction plate group 19, and the disk wire 22 is disconnected from the internal gear 11.

The electromagnetic brake assembly in the present invention includes: an electromagnet group 16 arranged on the chuck body shell 10 , a brake ring 17 and a guide pin group 34 arranged on the chuck end cover 28 . When the electromagnet group 16 is energized, the brake ring 17 is attracted, so that the chuck body shell 10 is connected with the chuck end cover 28 as a whole; Reset under the action of the permanent magnet group 18 on the top, and the chuck end cover 28 etc. are disconnected and connected with the chuck body shell 10.

Claims (2)

1. An electric chuck device, comprising a clamping functional unit, a power functional unit that does not rotate with the main shaft, an electromagnetic friction clutch assembly, an electromagnetic brake assembly, and a chuck body shell, characterized in that: the clamping functional unit is composed of a connecting screw group ( 26) The chuck seat (3) connected with the main shaft (1), the chuck end cover (28) connected with the chuck seat (3) through the connecting screw group (27), supported on the chuck seat by the bearing (24) The coil wire (22) on (3) is placed in the T groove on the chuck end cover (28) through its T-shaped key, and is connected with the coil wire (22) through its end surface thread, and is placed on the coil wire (22) ) is composed of jaws (23) for clamping or loosening the workpiece under the action of rotating motion; the power function unit is supported by the bearing group (4, 6) concentric with the main shaft (1) and the external engagement on the chuck seat (3). The gear pair (7, 8), the external gear (13) supported by the bearing (14) on the eccentric shaft section of the gear (7), is supported by the bearing group (29, 30) on the concentric shaft section of the gear (7) The internal gear (11) and the chuck motor etc. which provide rotating power for the coil wire (22) are composed of; the electromagnetic friction clutch assembly is composed of a power supply slip ring group (12) on the internal gear (11), a pressure ring (20), a A set of evenly distributed electromagnets (21), a set of evenly distributed guide screws (32) and return springs (33), friction plate sets (19), etc., can realize the synchronization of the coil wire (22) and the internal gear (11) Rotate or disconnect the coil wire (22) and the internal gear (11); the electromagnetic brake assembly consists of an electromagnet group (16) placed on the chuck body shell (10) and a guide pin placed on the chuck end cover (28). Group (34), braking ring (17), permanent magnet group (18) etc., can realize that chuck end cover (28) and chuck body shell (10) are connected as a whole or disconnect chuck end cover (28 ) is connected with the chuck body shell (10). 2. The electric chuck device according to claim 1, characterized in that the entire electric chuck device is an independent whole, and is connected with the main shaft (1) through the connecting screw group (26) and the connecting screw group (9) and the head of the bed Box connection, by unloading the connecting screw group (26) and the connecting screw group (9), the whole electric chuck device can be unloaded from the main shaft and the headstock as a whole.

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