A turning worm gear clamping structure

Abstract

This utility model relates to the technical field of worm gear processing equipment, specifically a clamping structure for turning worm gears. The slider is inserted into the groove and slidably connected to it. A fixed seat is fixedly installed at the upper end of the slider, and a positioning groove is provided at the front end of the fixed seat. An arc-shaped clamping groove is provided at the front end of the clamping block, and a positioning block is fixedly installed at the rear end of the clamping block. The positioning block is vertically inserted into the positioning groove. It adopts the integrated jaw design of a traditional three-jaw chuck. Through the detachable clamping block structure, wear is concentrated on an independent component. The arc-shaped clamping groove fits tightly with the worm gear surface. Even if the clamping block wears after long-term use, only a single clamping block needs to be replaced instead of the entire chuck. This avoids workpiece axis offset and radial runout caused by jaw wear, ensuring the dimensional accuracy and geometric tolerance of turning machining, and reducing the workpiece scrap rate.

Description

Technical Field

[0001] This utility model relates to the technical field of worm gear processing equipment, specifically a clamping structure for turning worm gears. Background Technology

[0002] During the turning process, worm gears need to be clamped and fixed by a three-jaw chuck on the machine tool. The centering function of the three-jaw chuck depends on the tight contact between the jaws and the workpiece surface. However, in long-term, high-frequency clamping operations, the jaws directly contact the workpiece and bear the clamping force and friction, which can easily lead to surface wear and decreased accuracy. When the jaws wear to a certain extent, the contact between them and the workpiece will decrease, which will cause centering errors. Specifically, this manifests as axial offset and increased radial runout after the workpiece is clamped, ultimately affecting the dimensional accuracy and form and position tolerances of the machined workpiece. In severe cases, it may even cause the workpiece to be scrapped, resulting in economic losses to production.

[0003] More importantly, the existing three-jaw chucks have significant limitations in their structural design: the connection between the jaws and the chuck body is mostly an integrated or complex fixed assembly structure, which is not conducive to the individual disassembly and replacement of worn jaws. When one or more jaws are worn and need repair, operators often have to remove the entire chuck from the equipment and then use special tools to disassemble the internal linkage mechanism of the chuck in order to complete the jaw replacement. This maintenance method is not only cumbersome and requires high technical skills from maintenance personnel, but also leads to long-term equipment downtime, which significantly reduces production efficiency. Especially in large-scale mass production scenarios, the production capacity loss caused by maintenance downtime is even more significant. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a clamping structure for turning worm gears.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a worm gear clamping structure for turning, comprising a machine tool body, a chuck seat on the machine tool body, a plurality of drive knobs and clamping components on the chuck seat, wherein the clamping components include a slide groove, a slider and a clamping block; The slider is inserted into the groove and slidably connected with the groove. A fixed seat is fixedly provided at the upper end of the slider. A positioning groove is provided at the front end of the fixed seat. An arc-shaped clamping groove is provided at the front end of the clamping block. A positioning block is fixedly provided at the rear end of the clamping block. The positioning block is vertically inserted into the positioning groove. The top of the positioning block is provided with a screw hole, and the rear end of the fixing seat is provided with a bolt that is inserted into the screw hole.

[0006] To improve the stability of the slider during use, the improvement of this utility model is that both the groove and the slider have an I-shaped cross section.

[0007] Furthermore, the improvements of this utility model include that the slider and the fixed base are an integrated structure, and the clamping block and the positioning block are an integrated structure.

[0008] To improve the stability of the clamping block after assembly, the present invention has an improvement in that the cross-section of the positioning groove is T-shaped.

[0009] Furthermore, the improvements of this utility model include that the slider and the slide groove are tightly fitted together, and the positioning block and the positioning groove are tightly fitted together.

[0010] Furthermore, the present invention includes an improvement in that the rear end of the positioning block is provided with a cavity, a spring is provided inside the cavity, one end of the spring is fixed inside the cavity, and the other end is provided with a locking block. The inner wall of the positioning groove is provided with a locking groove, and the locking block cooperates with the locking groove. The locking block is an isosceles trapezoidal structure.

[0011] (III) Beneficial Effects Compared with the prior art, the present invention provides a clamping structure for turning worm gears, which has the following advantages: Revolutionizing the traditional integrated jaw design of three-jaw chucks, this chuck uses a detachable clamping block structure to concentrate wear on individual components. The arc-shaped clamping groove fits tightly against the worm gear surface. Even after long-term use, if the clamping block wears out, only a single clamping block needs to be replaced instead of the entire chuck. This avoids workpiece axis misalignment and radial runout caused by jaw wear, ensuring dimensional accuracy and geometric tolerances in turning operations and reducing workpiece scrap rate. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This utility model Figure 1 A side view structural diagram; Figure 3 This utility model Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 This is a schematic diagram of the mating structure of the card block and the card slot in this utility model; In the diagram: 1. Machine tool body; 2. Chuck seat; 3. Slide groove; 4. Slider; 5. Fixed seat; 6. Positioning groove; 7. Clamping block; 8. Positioning block; 9. Bolt; 10. Screw hole; 11. Cavity; 12. Clamping block; 13. Clamping slot; 14. Drive knob. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-4 The present invention provides a worm gear clamping structure for turning, comprising a machine tool body 1, a chuck seat 2 on the machine tool body 1, a plurality of drive knobs 14 on the chuck seat 2 and a clamping assembly, wherein the clamping assembly includes a slide groove 3, a slider 4 and a clamping block 7. The slider 4 is inserted into the slide groove 3 and slidably connected with the slide groove 3. The upper end of the slider 4 is fixedly provided with a fixing seat 5. The front end of the fixing seat 5 is provided with a positioning groove 6. The front end of the clamping block 7 is provided with an arc-shaped clamping groove. The rear end of the clamping block 7 is fixedly provided with a positioning block 8. The positioning block 8 is vertically inserted into the positioning groove 6. The top of the positioning block 8 is provided with a screw hole 10, and the rear end of the fixing seat 5 is provided with a bolt 9 that is inserted into the screw hole 10.

[0015] Both the groove 3 and the slider 4 have an I-shaped cross section.

[0016] The slider 4 is in close contact with the slide groove 3, and the positioning block 8 is in close contact with the positioning groove 6.

[0017] Clamping component installation preparation: The cross-section of the positioning groove 6 is T-shaped.

[0018] Since both the groove 3 and the slider 4 have I-shaped cross sections, they fit tightly together and slide smoothly, which can prevent the slider 4 from radially shifting within the groove 3.

[0019] The fixing seat 5 at the upper end of the slider 4 is installed synchronously with the slider 4. The T-shaped positioning groove 6 at the front end of the fixing seat 5 is in a vertical state, providing a positioning basis for the subsequent assembly of the clamping block 7.

[0020] Clamping block 7 assembly and fixing: The slider 4 and the fixed base 5 are integrated into one structure, and the clamping block 7 and the positioning block 8 are integrated into one structure.

[0021] The positioning block 8 at the rear end of the clamping block 7 is vertically inserted into the T-shaped positioning groove 6 of the fixing seat 5, and the positioning block 8 fits tightly with the positioning groove 6.

[0022] The rear end of the positioning block 8 is provided with a cavity 11, and a spring is provided inside the cavity 11. One end of the spring is fixed inside the cavity 11, and the other end is provided with a locking block 12. The inner wall of the positioning groove 6 is provided with a locking groove 13, and the locking block 12 cooperates with the locking groove 13. The locking block 12 is an isosceles trapezoidal structure.

[0023] At this time, the spring in the cavity 11 at the rear end of the positioning block 8 pushes the locking block 12 to extend. The isosceles trapezoidal structure of the locking block 12 precisely matches the locking groove 13 on the inner wall of the positioning groove 6 to form a preliminary positioning.

[0024] Subsequently, the bolt 9 is screwed into the screw hole 10 on the top of the positioning block 8 from the rear end of the fixing seat 5. The tightening force of the bolt 9 firmly fixes the positioning block 8 in the positioning groove 6, ensuring that the arc-shaped clamping groove at the front end of the clamping block 7 is in a stable working position.

[0025] Worm gear workpiece clamping operation: Rotate the drive knob 14 on the chuck seat 2. The drive knob 14 drives multiple sliders 4 to move synchronously along the slide groove 3 through the internal transmission mechanism of the chuck seat 2. Each slider 4 drives the fixed seat 5 and the clamping block 7 to converge towards the center.

[0026] When the arc-shaped clamping groove contacts the worm gear workpiece, continue rotating the drive knob 14 until the arc-shaped clamping grooves of the multiple clamping blocks 7 are tightly fitted against the outer surface of the worm gear, completing the centering and clamping of the workpiece. At this time, the machine tool body 1 starts, and the chuck seat 2 drives the worm gear workpiece to rotate at a uniform speed, allowing for turning machining.

[0027] Clamping block 7 replacement and maintenance: When the arc-shaped clamping groove of the clamping block 7 becomes worn, loosen the bolt 9 and pull the clamping block 7 upward. Under the action of the pulling force, the locking block 12 at the rear end of the positioning block 8 compresses the spring and disengages from the locking groove 13, thus allowing the positioning block 8 to be pulled out from the positioning groove 6. After removing the worn clamping block 7, replace it with a new clamping block 7 to complete the quick replacement without disassembling the entire chuck seat 2.

[0028] The clamping block 7, through the cooperation of the positioning block 8 and the T-shaped positioning groove 6, the elastic positioning of the clamping block 12 and the clamping groove 13, and the locking of the bolt 9, forms a "plug-and-play" modular structure. Maintenance does not require disassembling the chuck seat 2 and the internal linkage mechanism, making it suitable for large-scale mass production scenarios.

[0029] The I-shaped groove 3 cooperates with the slider 4 to structurally limit the radial movement of the slider 4, ensuring the precise movement trajectory of the clamping block 7. The tight fit between the T-shaped positioning groove 6 and the positioning block 8, combined with the double fixation of the bolt 9 and the spring clip 12, keeps the clamping block 7 stable during high-speed rotating turning, preventing loosening due to vibration. The isosceles trapezoidal structure of the clip 12 and the groove 13 form a wedge-tightening effect, further enhancing the clamping block 7's resistance to falling off.

[0030] The arc-shaped clamping groove can be customized with different arcs according to the outer diameter of the worm. By replacing the corresponding clamping block 7, the same clamping structure can be adapted to worm workpieces of various diameters without replacing the chuck seat 2 or adjusting the machine tool parameters, thus expanding the processing range of the equipment and improving the versatility and flexibility of the production equipment.

[0031] The chuck seat 2 can be a manually modular chuck seat. The chuck seat 2 drive knob 14 drives the slider 4 to slide through a screw drive and lever linkage mechanism: when the knob is turned, its coaxial drive screw rotates, converting the rotational motion into linear motion of the slider 4 through the threaded pair, causing the slider 4 to slide centrifugally or centrifugally along the I-shaped groove 3. The multi-knob structure is linked by bevel gears or synchronous belts to ensure that multiple sliders 4 move synchronously. The tight fit design between the I-shaped groove 3 and the slider 4 uses a flange structure to limit the radial offset of the slider 4, and the longitudinal track guides to ensure accurate sliding trajectory. This mechanism converts rotational power into linear motion, and with the guiding constraint of the groove 3, it achieves stable sliding of the slider 4 and synchronous clamping of multiple jaws, ensuring accurate centering of the worm gear workpiece and convenient maintenance. The chuck seat 2 is an existing structure, and its details will not be elaborated here.

[0032] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A worm gear clamping structure for turning, comprising a machine tool body (1), a chuck seat (2) provided on the machine tool body (1), a plurality of drive knobs (14) provided on the chuck seat (2), and clamping components, characterized in that: The clamping assembly includes a groove (3), a slider (4), and a clamping block (7); The slider (4) is inserted into the slide groove (3) and slidably connected with the slide groove (3). The upper end of the slider (4) is fixedly provided with a fixing seat (5). The front end of the fixing seat (5) is provided with a positioning groove (6). The front end of the clamping block (7) is provided with an arc-shaped clamping groove. The rear end of the clamping block (7) is fixedly provided with a positioning block (8). The positioning block (8) is vertically inserted into the positioning groove (6). The top of the positioning block (8) is provided with a screw hole (10), and the rear end of the fixing seat (5) is provided with a bolt (9) that is inserted into the screw hole (10).

2. The turning worm clamping structure according to claim 1, characterized in that: The cross-sections of the groove (3) and the slider (4) are both I-shaped.

3. The turning worm gear clamping structure according to claim 2, characterized in that: The slider (4) and the fixed base (5) are an integrated structure, and the clamping block (7) and the positioning block (8) are an integrated structure.

4. The turning worm clamping structure according to claim 3, characterized in that: The positioning groove (6) has a T-shaped cross section.

5. The turning worm clamping structure according to claim 4, characterized in that: The slider (4) fits tightly against the slide groove (3), and the positioning block (8) fits tightly against the positioning groove (6).

6. The turning worm clamping structure according to claim 5, characterized in that: The positioning block (8) has a cavity (11) at its rear end. A spring is provided inside the cavity (11). One end of the spring is fixed inside the cavity (11), and the other end is provided with a locking block (12). A locking groove (13) is provided on the inner wall of the positioning groove (6). The locking block (12) cooperates with the locking groove (13). The locking block (12) is an isosceles trapezoidal structure.

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