A noise reducing drill spindle

Abstract

The utility model relates to the field of drilling and tapping main shaft discloses a drilling and tapping main shaft that reduces noise, include: the axle body for fixed broach claw, the rear end of axle body is equipped with pull rod subassembly, pull rod subassembly is used for connecting broach claw, sound insulation cover shell, the outside of axle body is covered, the rear end face of sound insulation cover shell is detachably connected with elastic buffer part, elastic buffer part is set out from the rear end face of sound insulation cover shell, the broach ring is set in the rear end of axle body, the broach ring is connected in pull rod subassembly, sets up elastic buffer part through in the broach ring axial movement path end, effectively absorbs and buffers the impact energy between broach ring and spacing structure, restrains the instantaneous high frequency noise that generates because of rigid impact from the source, improves the acoustic performance of working environment greatly, sound insulation cover shell blocks the internal noise to the outside spread, elastic buffer part weakens the impact excitation source, and the both combination forms the composite noise reduction system, and the noise reduction effect is better than single measure.

Description

Technical Field

[0001] This utility model relates to the field of drilling and tapping spindles, and more particularly to a drilling and tapping spindle with reduced noise. Background Technology

[0002] In the field of modern precision machining, integrated drilling and tapping spindles are key functional components in CNC machine tools, machining centers, and other equipment, widely used in drilling and tapping processes on workpieces made of metal and composite materials. These spindles typically use a broaching mechanism to clamp and release the tool. Their core structure includes a shaft for fixing the broaching jaws, a pull rod assembly linked to the broaching jaws, and a tool-clamping ring for driving the axial movement of the pull rod assembly. During tool changing, the tool-clamping ring generates axial impact displacement under external pneumatic or hydraulic pressure, pushing the pull rod assembly to move, thereby causing the broaching jaws to unfold to release the tool, or to close to clamp the tool during reset.

[0003] However, in actual operation, the rapid axial movement of the cutter ring is often accompanied by severe mechanical impacts, especially when it collides rigidly with the limiting structure or the spindle housing, easily generating high-frequency vibrations and transient noise. This type of noise not only affects the comfort of the working environment and interferes with the hearing health of operators, but may also cause whole-machine resonance through structural transmission, reducing machining accuracy and equipment lifespan. In addition, long-term repeated impact loads will also accelerate fatigue damage to the cutter ring, tie rod assembly, and related connecting parts, affecting the reliability of the spindle and maintenance cycle.

[0004] Therefore, there is an urgent need to provide a drilling and tapping spindle with a reasonable structure, convenient installation and significant noise reduction effect, which can effectively alleviate the impact noise during the action of the tool ring without sacrificing the spindle rigidity and dynamic performance, and improve the stability of equipment operation and the overall acoustic performance of the machine. Utility Model Content

[0005] The purpose of this invention is to provide a drilling and tapping spindle with reduced noise to solve the above-mentioned problems. The specific technical solution is as follows: A noise-reducing drilling and tapping spindle includes: A shaft for fixing the cutter claw, the rear end of which is provided with a pull rod assembly for connecting the cutter claw; A soundproof sleeve is fitted onto the outside of the shaft. The rear end face of the soundproof sleeve is detachably connected to an elastic buffer portion, which protrudes from the rear end face of the soundproof sleeve. A cutter ring is disposed at the rear end of the shaft body. The cutter ring is connected to the pull rod assembly. By driving the cutter ring to make axial displacement, the pull rod assembly is moved, thereby causing the cutter claw to unfold or close. The elastic buffer is disposed on the moving path of the cutter ring.

[0006] As an improvement to the above technical solution, the soundproof casing includes a first housing and a second housing, which surround the outside of the shaft, and the first housing and the second housing are detachably connected.

[0007] As an improvement to the above technical solution, the first housing and the second housing are respectively provided with protrusions and grooves for snap-fit ​​engagement.

[0008] As an improvement to the above technical solution, the rear end faces of the first housing and the second housing are respectively provided with a first arc-shaped groove and a second arc-shaped groove, configured such that when the first housing and the second housing are fastened together, the first arc-shaped groove and the second arc-shaped groove are spliced ​​together to form a through annular groove, the elastic buffer part is installed in the annular groove, and the elastic buffer part is located at the splicing point of the first arc-shaped groove and the second arc-shaped groove.

[0009] As an improvement to the above technical solution, the elastic buffer includes a fixing rod and rubber pads and connectors connected to both ends of the fixing rod. The connector has two protrusions spaced apart. The first arc-shaped groove and the second arc-shaped groove are respectively provided with a first insertion groove and a second insertion groove on the bottom surface near the splice for receiving the protrusions.

[0010] The beneficial effects of this utility model are as follows: by setting an elastic buffer at the end of the axial movement path of the cutter ring, the impact energy between the cutter ring and the limiting structure is effectively absorbed and buffered, the instantaneous high-frequency noise caused by rigid collision is suppressed from the source, and the acoustic performance of the working environment is greatly improved.

[0011] The soundproof shell blocks internal noise from spreading outwards, while the elastic buffer weakens the impact excitation source. The combination of the two forms a composite noise reduction system, which has a better noise reduction effect than a single measure.

[0012] All noise reduction components are integrated on the outside of the spindle body, without encroaching on the internal transmission or cooling space, making it easy to adapt to existing CNC machine tools and machining centers without requiring major modifications to the overall structure.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a structural schematic diagram of the soundproof shell of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the elastic buffer part of this utility model.

[0018] In the diagram: 1. Shaft; 2. Pulling claw; 3. Pull rod assembly; 4. Soundproof sleeve; 41. First housing; 42. Second housing; 411. First arc groove; 421. Second arc groove; 412. First insertion groove; 422. Second insertion groove; 5. Elastic buffer part; 51. Fixing rod; 52. Rubber pad; 53. Insertion piece; 54. Protrusion part; 6. Cutting ring. Detailed Implementation

[0019] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] Please see Figures 1-3 In this embodiment of the utility model, the main components include a shaft 1, a pull rod assembly 3, a puller claw 2, a cutter ring 6, and a soundproof sleeve 4.

[0022] The shaft 1 serves as the main structure of the spindle, with the front end for mounting the cutting tool and the rear end equipped with a tie rod assembly 3. The tie rod assembly 3 extends axially along the shaft 1, and the cutter pawl 2 is located inside the front end of the shaft 1. The axial movement of the tie rod assembly 3 controls the opening or closing of the cutter pawl 2, thereby realizing the release or clamping of the tool.

[0023] A sound-insulating sleeve 4 is fitted onto the outer side of the spindle body 1. This sound-insulating sleeve 4 is made of metal or composite material with certain acoustic damping characteristics, effectively isolating structural noise generated by the internal moving parts of the spindle from propagation to the external environment. Specifically, an elastic buffer portion 5 is detachably connected to the rear end face of the sound-insulating sleeve 4. This elastic buffer portion 5 protrudes entirely from the rear end face of the sound-insulating sleeve 4 and is positioned along the axial movement path of the tool-changing ring 6.

[0024] The cutter ring 6 is installed at the rear end of the shaft 1 and is linked to the pull rod assembly 3. During the tool change process, an external drive device (such as a cylinder or hydraulic cylinder) pushes the cutter ring 6 to move axially backward. The cutter ring 6 then drives the pull rod assembly 3 to move backward, causing the cutter pawl 2 to release the tool. When the cutter ring 6 reaches the end of its forward stroke, it will directly contact and press against the elastic buffer part 5. Because the elastic buffer part 5 has good elasticity and energy absorption capacity, it can effectively buffer the impact force of the cutter ring 6 at the extreme position and prevent it from colliding hard with the rigid structure.

[0025] Through the above structural design, the present invention solves the technical problem of strong impact noise generated by the rigid collision between the tool ring 6 and the limiting structure during the tool changing process of the existing drilling and tapping spindle.

[0026] By setting an elastic buffer part 5 protruding from the rear end of the sound insulation sleeve 4 at the end of the movement path of the tool-changing ring 6, the impact of the tool-changing is effectively absorbed and buffered, reducing the instantaneous noise during the tool changing process. The sound insulation sleeve 4 and the elastic buffer part 5 work together to suppress noise leakage from the propagation path and reduce impact excitation from the source. The dual noise reduction mechanism improves the overall acoustic performance of the machine. The elastic buffer part 5 adopts a detachable connection method, which is convenient for maintenance and replacement, and improves the serviceability and long-term operational reliability of the spindle. The soundproof housing 4 includes a first housing 41 and a second housing 42, which surround the outer side of the shaft 1. The first housing 41 and the second housing 42 are detachably connected. Specifically, the first housing 41 and the second housing 42 are respectively provided with protrusions and grooves for snap-fit ​​engagement.

[0027] Based on the aforementioned noise-reducing drilling spindle, in order to further improve the installation stability, disassembly convenience, and overall structural compactness of the elastic buffer part 5, this embodiment has optimized the design of the soundproof sleeve 4 and its connection method with the elastic buffer part 5.

[0028] In some embodiments, the rear end faces of the first housing 41 and the second housing 42 are respectively provided with a first arc-shaped groove 411 and a second arc-shaped groove 421, configured such that when the first housing 41 and the second housing 42 are fastened together, the first arc-shaped groove 411 and the second arc-shaped groove 421 are spliced ​​together to form a through annular groove, the elastic buffer part 5 is installed in the annular groove, and the elastic buffer part 5 is disposed at the splice of the first arc-shaped groove 411 and the second arc-shaped groove 421. Further, the elastic buffer part 5 includes a fixing rod 51 and rubber pads 52 and plugs 53 connected to both ends of the fixing rod 51. The plugs 53 are provided with two spaced protrusions 54. The first arc-shaped groove 411 and the second arc-shaped groove 421 are respectively provided with a first plug groove 412 and a second plug groove 422 on the bottom surface near the splice for receiving the protrusions 54.

[0029] The rubber pad 52 directly withstands the axial impact of the cutting ring 6, providing flexible cushioning. The connector 53 has two axially spaced protrusions 54. Correspondingly, on the bottom surfaces of the first arc-shaped groove 411 and the second arc-shaped groove 421 near the joint, there are a first insertion groove 412 and a second insertion groove 422, respectively, to accommodate the two protrusions 54. When the housing is fastened, the protrusions 54 of the connector 53 automatically embed into the corresponding insertion grooves, achieving dual axial and circumferential positioning of the elastic buffer 5 within the annular groove, effectively preventing it from loosening, falling off, or shifting during high-speed spindle operation or frequent tool changes.

[0030] It should be noted that the terms "first," "second," etc., used in this document are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A noise-reducing drilling and tapping spindle, characterized in that, include: A shaft for fixing the cutter claw, the rear end of which is provided with a pull rod assembly for connecting the cutter claw; A soundproof sleeve is fitted onto the outside of the shaft. The rear end face of the soundproof sleeve is detachably connected to an elastic buffer portion, which protrudes from the rear end face of the soundproof sleeve. A cutter ring is disposed at the rear end of the shaft body. The cutter ring is connected to the pull rod assembly. By driving the cutter ring to make axial displacement, the pull rod assembly is moved, thereby causing the cutter claw to unfold or close. The elastic buffer is disposed on the moving path of the cutter ring.

2. The noise-reducing drilling and tapping spindle according to claim 1, characterized in that: The soundproof enclosure includes a first housing and a second housing, which surround the outside of the shaft, and the first housing and the second housing are detachably connected.

3. A noise-reducing drilling and tapping spindle according to claim 2, characterized in that: The first housing and the second housing are respectively provided with protrusions and grooves for snap-fit ​​engagement.

4. A noise-reducing drilling and tapping spindle according to claim 2, characterized in that: The rear end faces of the first housing and the second housing are respectively provided with a first arc-shaped groove and a second arc-shaped groove, configured such that when the first housing and the second housing are fastened together, the first arc-shaped groove and the second arc-shaped groove are spliced ​​together to form a through annular groove, the elastic buffer part is installed in the annular groove, and the elastic buffer part is located at the splice of the first arc-shaped groove and the second arc-shaped groove.

5. A noise-reducing drilling and tapping spindle according to claim 4, characterized in that: The elastic buffer includes a fixing rod and rubber pads and connectors connected to both ends of the fixing rod. The connector has two spaced-apart protrusions. The first arc-shaped groove and the second arc-shaped groove have a first insertion groove and a second insertion groove on the bottom surface near the splice, respectively, for receiving the protrusions.

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