A high-torque tool spindle

Abstract

This utility model discloses a high-torque tool spindle, relating to the field of tool spindle technology. The utility model includes a base, inside which a main body is rotatably mounted via bearings. A piston rod is disposed within the main body, and an extended sliding sleeve is threaded into the piston rod. An elastic chuck is fixedly mounted on the surface of the extended sliding sleeve. A limit plate is disposed at the end of the main body and inside the base. Copper sleeves are disposed on the surface of the main body and inside the base. This utility model, through a sealed dual-cylinder and three-piston parallel layout, allows high-pressure gas to switch action on four chambers, generating approximately 2.5 times the thrust of a traditional single-cylinder at the same gas pressure, eliminating slippage of large-diameter tools during heavy-duty cutting. By integrating the cylinder body and elastic chuck into the base, the rear cylinder, tie rod, and coupling are eliminated, shortening the overall axial length of the machine. It can directly replace existing machine tool spindles without modifying the machine bed, saving installation space.

Description

Technical Field

[0001] This utility model relates to the field of tool spindle technology, specifically to a high-torque tool spindle. Background Technology

[0002] Existing tool spindle systems generally adopt a three-section structure of "spindle + rear cylinder + passive collet": the spindle body is responsible for high-speed rotation, the rear cylinder provides pushing and pulling power, and the passive collet completes clamping and releasing under the action of the cylinder.

[0003] However, the following shortcomings are exposed under heavy-load cutting conditions:

[0004] ① The thrust of the rear-mounted cylinder is limited, making it difficult to meet the clamping force required for large-diameter tools, often resulting in slippage.

[0005] ② The cylinder and spindle are arranged separately, requiring additional tie rods and couplings, which increases the overall length of the machine and limits the installation space;

[0006] ③ Traditional light-load bearings have insufficient load-bearing capacity. Under high torque, the spindle temperature rises rapidly and vibration is large, which affects machining accuracy and lifespan.

[0007] ④ The series connection of multiple parts leads to large cumulative errors, complicated debugging and maintenance, and long downtime.

[0008] To address this, a high-torque tool spindle is proposed. Utility Model Content

[0009] The purpose of this utility model is to provide a high-torque tool spindle in order to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0011] A high-torque tool spindle includes a base, a body rotatably mounted inside the base via bearings, a piston rod disposed within the body, an extended sliding sleeve threaded into the piston rod, and an elastic collet fixedly mounted on the surface of the extended sliding sleeve. A limit plate is disposed at the end of the body and inside the base. A copper sleeve is disposed on the surface of the body and inside the base. A retaining ring is fixedly fitted on the surface of the body, and a small nut is fixedly mounted on the surface of the body via the retaining ring. A cylinder, a first piston, a second piston, and a third piston are fixedly fitted on the surface of the piston rod, and a deep groove ball bearing is disposed between the cylinder and the base. A large nut is disposed on the surface of the cylinder, and a pulley is fixedly fitted on the surface of the piston rod.

[0012] Furthermore, the cylinder body is a closed double-cylinder structure, with the first piston, the second piston, and the third piston respectively installed in two chambers of the double cylinder, forming four chambers, which are driven by air pressure to clamp and release the elastic chuck.

[0013] Furthermore, the elastic chuck is made of high-precision spring material, which enables it to clamp and release the workpiece under its own elastic force.

[0014] Furthermore, the bearings and deep groove ball bearings are multiple sets of heavy-duty bearings, capable of withstanding large axial and radial loads.

[0015] The beneficial effects of this utility model are as follows:

[0016] By using a closed dual-cylinder and three-piston parallel layout, the high-pressure gas is switched to act on the four chambers, which can generate about 2.5 times the thrust of a traditional single cylinder under the same gas pressure, eliminating the slippage phenomenon of large-diameter tools during heavy-duty cutting.

[0017] By integrating the cylinder and flexible chuck into the base, the rear-mounted cylinder, tie rod, and coupling are eliminated, shortening the overall axial length of the machine. It can directly replace the existing machine tool spindle without modifying the bed, saving installation space. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is an exploded view of this utility model;

[0020] Figure 3 This is a front sectional view of the present invention;

[0021] Reference numerals in the attached drawings: 1. Base; 2. Body; 3. Cylinder; 4. Pulley; 5. Copper sleeve; 6. First piston; 7. Second piston; 8. Third piston; 9. Piston rod; 10. Elastic collet; 11. Small nut; 12. Large nut; 13. Retaining ring; 14. Limiting plate; 15. Extended sliding sleeve; 16. Bearing; 17. Deep groove ball bearing. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. 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.

[0026] like Figures 1 to 3 As shown, a high-torque tool spindle includes a base 1. A body 2 is rotatably mounted inside the base 1 via a bearing 16. A piston rod 9 is provided inside the body 2, and an extended sliding sleeve 15 is threaded into the piston rod 9. An elastic collet 10 is fixedly mounted on the surface of the extended sliding sleeve 15. A limit plate 14 is provided at the end of the body 2 and inside the base 1. A copper sleeve 5 is provided on the surface of the body 2 and inside the base 1. A retaining ring 13 is fixedly fitted on the surface of the body 2, and a small nut 11 is fixedly installed on the surface of the body 2 via the retaining ring 13. A cylinder 3, a first piston 6, a second piston 7, and a third piston 8 are fixedly fitted on the surface of the piston rod 9. A deep groove ball bearing 17 is provided between the cylinder 3 and the base 1. A large nut 12 is provided on the surface of the cylinder 3. A pulley 4 is fixedly fitted on the surface of the piston rod 9.

[0027] In some practical applications, the cylinder body 3 is a closed double cylinder structure. The first piston 6, the second piston 7 and the third piston 8 are respectively installed in the two chambers of the double cylinder, forming four chambers. The clamping and releasing of the elastic chuck 10 is achieved by air pressure drive.

[0028] More specifically, the closed dual-cylinder design applies high-pressure gas simultaneously to the first piston 6, the second piston 7, and the third piston 8, forming a symmetrical thrust. Under the combined action of the two forces, the piston rod 9 generates a larger axial clamping force, enabling reliable clamping of the elastic chuck 10 under high torque conditions. When reversing, the gas switches to the other side chamber, the piston moves in the opposite direction, the chuck opens, and a quick tool change is completed.

[0029] In some practical applications, the elastic chuck 10 is made of high-precision spring material, which can clamp and release the workpiece under its own elastic force.

[0030] More specifically, when the piston rod 9 moves backward, the conical surface of the elastic chuck 10 engages with the conical hole of the body 2 to generate a radial contraction force, utilizing the high resilience of the material to form a uniform clamping of the workpiece; when the piston rod 9 moves forward, the elastic chuck 10 loses its constraint and quickly resets and opens by its own elastic force, achieving a clamping action without additional power.

[0031] In some practical applications, bearing 16 and deep groove ball bearing 17 are multiple sets of heavy-duty bearings, capable of withstanding large axial and radial loads.

[0032] More specifically, bearing 16 and deep groove ball bearing 17 are respectively arranged at the front and rear ends of the base 1 to form a front positioning and rear support structure, which together bear the axial thrust and radial bending moment generated during cutting, ensuring that the spindle maintains low vibration and high precision operation under high speed and high torque conditions.

[0033] In summary: When high-pressure gas enters the copper sleeve 5 through hole A on the base 1, it forms an air ring through the annular groove on the sleeve 5. The eight Φ3 holes on this air ring enter the air ring on the body 2, and then the two Φ4 holes on the body 2, continuing forward into the fourth air chamber. Simultaneously, high-pressure gas enters the second air chamber from the cylinder 3, causing the first piston 6, second piston 7, and third piston 8 to move to the right simultaneously. This moves the elastic chuck 10 to the right, and under its own elastic force, the elastic chuck 10 opens its inner hole, releasing the workpiece. At this point, the workpiece can be replaced; the air intake direction can be switched. When high-pressure gas enters the copper sleeve 5 through the hole 1B in the base, it forms an air ring through the annular groove on the copper sleeve 5. The eight Φ3 holes on the air ring enter the air ring on the body 2, and then enter the two Φ4 holes on the body 2. Then, it enters the third air chamber along the air hole inside the cylinder 3. At the same time, high-pressure gas enters the first air chamber from the air inside the pulley 4. As a result, the first piston 6, the second piston 7, and the third piston 8 move to the left, driving the elastic chuck 10 to move to the left. Under the action of the taper of the body 2, the inner hole of the elastic chuck 10 becomes smaller, thereby clamping the workpiece.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-torque tool spindle, characterized in that, The system includes a base (1), inside which a body (2) is rotatably mounted via a bearing (16). A piston rod (9) is provided inside the body (2), and an extended sliding sleeve (15) is threaded into the piston rod (9). An elastic clamp (10) is fixedly mounted on the surface of the extended sliding sleeve (15). A limit plate (14) is provided at the end of the body (2) and inside the base (1). A copper sleeve (5) is provided on the surface of the body (2) and inside the base (1). A retaining ring (13) is fixedly mounted on the surface of the body (2), and a small nut (11) is installed on the surface of the body (2) by the retaining ring (13). A cylinder (3), a first piston (6), a second piston (7), and a third piston (8) are fixedly mounted on the surface of the piston rod (9). A deep groove ball bearing (17) is provided between the cylinder (3) and the base (1). A large nut (12) is provided on the surface of the cylinder (3). A pulley (4) is fixedly mounted on the surface of the piston rod (9).

2. The high-torque tool spindle according to claim 1, characterized in that, The cylinder body (3) is a closed double cylinder structure. The first piston (6), the second piston (7) and the third piston (8) are respectively installed in the two air chambers of the double cylinder to form four air chambers. The clamping and loosening of the elastic chuck (10) is achieved by air pressure drive.

3. A high-torque tool spindle according to claim 1, characterized in that, The elastic chuck (10) is made of high-precision spring material and can clamp and release the workpiece under its own elastic force.

4. A high-torque tool spindle according to claim 1, characterized in that, The bearing (16) and the deep groove ball bearing (17) are multiple sets of heavy-duty bearings, capable of withstanding large axial and radial loads.

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