A noise reduction type numerical control machine tool

Abstract

The application provides a noise reduction type numerical control machine tool, which comprises a machine tool body and a noise reduction shell. The noise reduction shell is formed by a left noise reduction plate, a right noise reduction plate, a connecting plate, an embedded plate and a top noise reduction plate. The three-layer composite sound insulation structure of the plates, the gap sealing of the stepped sealing groove of the connecting plate and the water-swelling rubber strip, the vibration transmission blocking of the butyronitrile rubber damping pad of the embedded plate and other designs can effectively constrain and absorb most of the noise generated during the operation of the machine tool. Meanwhile, the exhaust hole of the top noise reduction plate is matched with the sound attenuation pipe composed of the spiral sound absorption pipe and the sound absorption cotton to attenuate the airflow noise carried in the exhaust process, avoid the exhaust from becoming a new noise leakage path, and the noise reduction shell still retains the protection function of the traditional shell, such as preventing iron filings from splashing, preventing cutting fluid from overflowing and protecting core components, while achieving efficient noise reduction.

Description

Technical Field

[0001] This application relates to the field of CNC machine tool technology, and in particular to a noise-reducing CNC machine tool. Background Technology

[0002] CNC machine tools are automated processing equipment that integrates core components such as CNC systems, spindle units, feed transmission systems, and worktables. They can automatically complete precision machining processes such as cutting, milling, and drilling of workpieces through preset programs. They are widely used in fields such as machinery manufacturing, automotive parts, and aerospace, and their machining accuracy and efficiency are significantly better than traditional processing equipment.

[0003] The existing technology has the following problems: The housing of existing CNC machine tools is usually made of single-layer sheet metal structure, which is only used to block the splashing of iron filings and the overflow of cutting fluid during the machining process, and to protect the core components inside the machine tool from external environmental interference and the operators from machining risks. It does not provide other additional functions, especially lacking targeted noise reduction design. During the operation of CNC machine tools, the high-speed rotation of the spindle, the operation of the motor, and the airflow will generate strong noise. This noise will be directly transmitted to the workshop environment through the housing. This will not only easily cause the operators to be in a high-decibel noise environment for a long time, affecting their physical health and work concentration, but may also fail to meet the environmental protection standards for workshop noise. Utility Model Content

[0004] The purpose of this invention is to provide a noise-reducing CNC machine tool to solve the above-mentioned problems.

[0005] The technical solution of this application is implemented as follows: This application provides a noise-reducing CNC machining tool, including a machine tool body, with a noise-reducing shell covering the outer side of the machine tool body; the noise-reducing shell includes a left noise-reducing plate and a right noise-reducing plate, which are disposed on the left and right sides of the machine tool body, and a connecting plate is fixedly installed at their front ends; an embedded plate is fixedly installed at the bottom of the left and right noise-reducing plates, which are embedded in the bottom front end of the machine tool body; and a top noise-reducing plate is fixedly installed at the top of the left and right noise-reducing plates. The left noise reduction plate, right noise reduction plate, connecting plate, embedded plate and top noise reduction plate together form a closed noise reduction cavity, and the machine tool body is housed in the noise reduction cavity; The top of the noise reduction plate has an exhaust hole, and a silencer pipe is fixedly installed at the top of the top of the noise reduction plate at the location of the exhaust hole. The silencer pipe is connected to the exhaust hole.

[0006] In one embodiment, the left noise reduction plate, right noise reduction plate, connecting plate, embedded plate and top noise reduction plate are all three-layer composite sound insulation structures, with only differences in shape and installation position, but the structural composition is exactly the same.

[0007] In one embodiment, the top noise reduction plate is a three-layer composite structure, consisting of a cold-rolled steel plate, centrifugal glass wool, and a perforated plate from the outside to the inside. The three-layer structure is fixed by rivets, and an air layer is reserved between adjacent layers.

[0008] In one embodiment, a damping coating is sprayed onto the surface of the cold-rolled steel sheet.

[0009] In one embodiment, the silencer tube includes a protective tube shell, which is fixedly installed at the top of the top noise reduction plate at the position corresponding to the exhaust hole. A sound-absorbing tube is embedded inside the protective tube shell, and the sound-absorbing tube is connected to the exhaust hole. Sound-absorbing cotton is attached inside the sound-absorbing tube.

[0010] In one embodiment, the sound-absorbing tube has a spiral structure.

[0011] In one embodiment, the connection between the connecting plate and the left noise reduction plate and the right noise reduction plate is provided with a stepped sealing groove, and a water-swellable rubber strip is embedded in the sealing groove.

[0012] In one embodiment, a nitrile rubber shock-absorbing pad is provided between the embedding plate and the mounting surface of the machine tool body.

[0013] The advantages or beneficial effects of the above technical solutions include at least the following: This application discloses a noise-reducing CNC machining tool. By setting a closed noise-reducing cavity on the outside of the machine tool body, which is formed by a left noise-reducing plate, a right noise-reducing plate, a connecting plate, an embedded plate and a top noise-reducing plate, combined with the three-layer composite sound insulation structure of each plate, as well as the stepped sealing groove of the connecting plate and the gap sealing of the water-swellable rubber strip, and the nitrile rubber shock-absorbing pad of the embedded plate to block the transmission of vibration, it can effectively constrain and absorb most of the noise generated during the operation of the machine tool, and solve the problem that the existing single-layer sheet metal shell can only protect but cannot reduce noise. Meanwhile, the exhaust vents of the top noise reduction plate, combined with the silencing tube composed of a spiral sound-absorbing pipe and sound-absorbing cotton, effectively attenuate the airflow noise carried during the exhaust process while ensuring the machine tool's heat dissipation function. This prevents the exhaust from becoming a new noise leakage path and significantly reduces the overall noise transmission into the workshop environment. This not only reduces the health risks of operators being exposed to high-decibel environments for extended periods and improves their work concentration, but also meets the workshop's noise environmental protection standards. Furthermore, while achieving efficient noise reduction, the noise-reducing housing still retains the protective functions of traditional housings, such as preventing metal shavings from splashing, cutting fluid from overflowing, and protecting core components. Attached Figure Description

[0014] The accompanying drawings illustrate exemplary embodiments of the present application and, together with the description thereof, serve to explain the principles of the present application. These drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification.

[0015] Figure 1 A schematic diagram of the overall structure of an embodiment of this application is shown; Figure 2 A structural schematic diagram of the noise-reducing housing according to an embodiment of this application is shown; Figure 3 An exploded structural diagram of the noise-reducing shell according to an embodiment of this application is shown; Figure 4 A structural schematic diagram of the top noise reduction plate according to an embodiment of this application is shown; Figure 5 An exploded structural diagram of the top noise reduction plate according to an embodiment of this application is shown; Figure 6 A schematic diagram of the silencer tube according to an embodiment of this application is shown; Figure 7 A structural schematic diagram of the sound-absorbing tube according to an embodiment of this application is shown.

[0016] Reference numerals in the attached drawings: Machine tool body-1, Noise-reducing outer shell-2, Left noise-reducing plate-21, Right noise-reducing plate-22, Connecting plate-23, Embedded plate-24, Top noise-reducing plate-25, Exhaust hole-26, Silencer pipe-27, Cold-rolled steel plate-251, Centrifugal glass wool-252, Perforated plate-253, Protective tube shell-271, Sound-absorbing pipe-272, Sound-absorbing cotton-273. Detailed Implementation

[0017] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0018] It should be noted that, where there is no conflict, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0020] It should be noted that the terms "a" and "several" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0021] The names of the messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0022] Reference Figure 1 A noise-reducing CNC machining tool includes a machine tool body 1. The machine tool body 1 is the core carrier for realizing precision machining processes such as workpiece cutting, milling, and drilling. It can automatically complete machining actions according to a preset program, providing a basic guarantee for machining accuracy and efficiency. This is existing technology, so it will not be described in detail.

[0023] The machine tool body 1 is covered with a noise reduction shell 2, which forms a noise reduction cavity by enclosing the machine tool body 1, thus confining the noise generated during operation within the cavity and reducing the spread of noise to the external environment. It can also serve the protective function of a traditional machine tool housing, preventing metal shavings from splashing and cutting fluid from overflowing during processing, avoiding interference from the external environment to the core components inside the machine tool, and protecting operators from processing risks.

[0024] In one embodiment, reference is made to Figures 2-3 The noise reduction housing 2 includes a left noise reduction plate 21 and a right noise reduction plate 22. The left noise reduction plate 21 and the right noise reduction plate 22 are installed on the left and right sides of the machine tool body 1. They are the main structures on both sides of the noise reduction housing 2, which close the left and right sides of the machine tool body 1, prevent internal noise from leaking out from the sides, and provide installation support for the connecting plate 23, the embedded plate 24, and the top noise reduction plate 25.

[0025] A connecting plate 23 is fixedly installed at the front end of the left noise reduction plate 21 and the right noise reduction plate 22. The connecting plate 23 is used to connect the left noise reduction plate 21 and the right noise reduction plate 22. After the three are connected, they can provide an installation position for the subsequent door and observation window. The observation window can be equipped with double-layer laminated glass to further improve the noise reduction effect. Among them, the connection between the connecting plate 23 and the left noise reduction plate 21 and the right noise reduction plate 22 is provided with a stepped sealing groove. Through the stepped groove structure, the installation and positioning space of the water-swellable rubber strip can be provided, ensuring that the rubber strip can be tightly fitted into the connection gap. At the same time, the stepped shape can extend the penetration path of noise and itself has a certain physical barrier effect. Furthermore, the sealing groove is embedded with a water-swellable rubber strip. Under normal conditions, the water-swellable rubber strip can fill the sealing groove and the connection gap with its own elasticity, blocking noise leakage from the joint of the plates. When the cutting fluid and coolant generated during the processing come into contact with the rubber strip, they will expand in volume, further filling the tiny gaps that may be caused by vibration and thermal expansion and contraction. This not only prevents liquid from leaking to the outside of the machine tool, but also avoids the noise leakage caused by the expansion of the gap.

[0026] The left noise reduction plate 21 and the right noise reduction plate 22 are fixedly installed with an embedded plate 24 at their bottom. The embedded plate 24 is embedded in the bottom front end of the machine tool body 1. The embedded plate 24 is used to provide bottom support for the left noise reduction plate 21 and the right noise reduction plate 22, to ensure the installation stability of the entire noise reduction shell 2, and to prevent the shell from shifting due to vibration during machine tool operation. At the same time, through its embedded cooperation with the machine tool body 1, it assists other sound insulation components such as the left noise reduction plate 21 and the right noise reduction plate 22 in forming a closed noise reduction cavity. Among them, a nitrile rubber damping pad is provided between the embedding plate 24 and the mounting surface of the machine tool body 1. When the machine tool is running, the core components such as the spindle and motor will generate continuous vibration. If the embedding plate 24 is in direct rigid contact with the machine tool body 1, it will cause the entire shell to resonate and radiate vibration noise outward. Nitrile rubber damping pads have excellent elasticity and damping properties. They absorb vibration energy through their own elastic deformation, converting rigidly transmitted vibration into frictional heat energy consumption within the rubber, significantly reducing the vibration transmission efficiency from the machine tool body 1 to the noise reduction housing 2, and reducing secondary noise generated by housing resonance.

[0027] Top noise reduction plate 25 is fixedly installed on the top of the left noise reduction plate 21 and the right noise reduction plate 22. The top noise reduction plate 25 is used to seal the top of the machine tool body 1 to block the leakage of top noise, and at the same time serves as the mounting carrier for the exhaust port 26 and the silencer pipe 27.

[0028] The left noise reduction plate 21, right noise reduction plate 22, connecting plate 23, embedded plate 24 and top noise reduction plate 25 together form a closed noise reduction cavity. The machine tool body 1 is housed in the noise reduction cavity. By housing the machine tool body 1 therein, the noise generated by the operation of the machine tool can be confined within the closed space, reducing direct transmission to the external environment and reducing the noise of the machine tool body 1 during operation.

[0029] The top of the noise reduction plate 25 has an exhaust hole 26 through it. The exhaust hole 26 serves as a communication channel between the machine tool interior and the silencer pipe 27. It can exhaust the hot air generated during the operation of the machine tool, ensuring the heat dissipation requirements of the machine tool, and allowing the noise carried by the airflow to enter the silencer pipe 27 for noise reduction treatment, thereby reducing the noise during the exhaust process.

[0030] A silencer pipe 27 is fixedly installed at the top of the top noise reduction plate 25 at the location where the exhaust hole 26 is opened. The silencer pipe 27 is connected to the exhaust hole 26 and absorbs airflow noise and noise transmitted from inside the machine tool to the exhaust hole 26.

[0031] In one embodiment, reference is made to Figures 4-5 The top noise reduction plate 25 has a three-layer composite structure, consisting of cold-rolled steel plate 251, centrifugal glass wool 252 and perforated plate 253 from the outside to the inside. Cold-rolled steel plate 251 serves as a rigid support layer for the top noise reduction plate. On the one hand, it provides structural strength, provides a location for the installation of the silencer pipe 27 and resists external impacts. On the other hand, the high density of the steel plate can reflect some of the incident noise and reduce the energy of noise penetration. Among them, the surface of the cold-rolled steel sheet 251 is coated with a damping coating. When the machine tool is running, the vibration of the internal motor, spindle and other components will be transmitted to the cold-rolled steel sheet 251 through the structure, causing it to resonate and radiate vibration noise outward. The damping coating has viscoelasticity and can convert the vibration mechanical energy of the cold-rolled steel sheet 251 into heat energy through the friction between its own molecules, which significantly reduces the vibration amplitude and vibration frequency of the steel sheet, thereby reducing the noise radiation caused by vibration.

[0032] Centrifugal glass wool 252, with its porous structure, can absorb noise through air viscosity resistance, fiber vibration friction, etc., converting sound energy into heat energy consumption, thereby reducing the noise generated when the machine tool body 1 is running.

[0033] The perforated plate 253 has holes arranged in an array. These holes can guide the internal noise of the machine tool into the centrifugal glass wool 252 for absorption, while preventing iron filings and dust from directly contacting the glass wool during processing, thus avoiding contamination or damage.

[0034] The three-layer structure is fixed by rivets, and an air layer is reserved between adjacent layers. The rivet connection ensures that the three-layer structure fits tightly and avoids noise leakage due to gaps caused by loosening. The air layer between adjacent layers utilizes the acoustic impedance characteristics of air to further block the transmission of sound waves. The air layer can be filled with nano-aerogel felt to further improve the overall sound insulation performance.

[0035] In one embodiment, reference is made to Figure 3 The left noise reduction panel 21, right noise reduction panel 22, connecting plate 23, embedded plate 24 and top noise reduction panel 25 are all three-layer composite sound insulation structures. They are only different in shape and installation position, but their structural composition is exactly the same. This design ensures that the noise blocking and absorption capabilities of the left and right sides, front end, top and bottom connection areas of the machine tool body 1 remain at a uniform standard, avoiding insufficient sound insulation performance in a certain area due to local structural differences. This results in the entire noise reduction cavity forming a uniform and efficient closed sound insulation environment, minimizing the transmission of machine tool operating noise to the outside. Furthermore, the unified structural composition can significantly reduce design complexity, eliminating the need to develop separate sound insulation solutions for panels in different locations; only the shape needs to be adjusted according to installation requirements.

[0036] In one embodiment, reference is made to Figures 6-7 The silencer tube 27 includes a protective tube shell 271, which is fixedly installed at the top of the top noise reduction plate 25 at the position corresponding to the exhaust hole 26. The protective tube shell 271 is used to provide physical protection for the internal sound-absorbing tube 272 and sound-absorbing cotton 273, so as to prevent the external environment from damaging the sound-absorbing tube 272 and sound-absorbing cotton 273.

[0037] The protective tube shell 271 is internally fitted with a sound-absorbing tube 272, which is connected to the exhaust port 26. The sound-absorbing tube 272 can guide the airflow in an orderly manner through its own tubular structure, and at the same time provide an installation carrier for the sound-absorbing cotton 273, so that the noise carried by the airflow can fully contact the sound-absorbing cotton 273 on the inner wall when it flows through the sound-absorbing tube 272.

[0038] The sound-absorbing tube 272 is fitted with sound-absorbing cotton 273. The porous structure of the sound-absorbing cotton 273 can absorb the airflow noise flowing through the sound-absorbing tube 272 and the sound wave energy transmitted from the inside of the machine tool body 1 to the exhaust port 26 through the effects of air viscosity resistance and fiber vibration friction, and convert the sound energy into heat energy for consumption, thereby greatly reducing the noise intensity propagating outward during the exhaust process.

[0039] Among them, the sound-absorbing tube 272 has a spiral structure. After the airflow inside the machine tool body 1 enters the sound-absorbing tube 272 through the exhaust hole 26, the spiral path will significantly extend the propagation distance of the airflow and noise, so that the noise will have more sufficient contact with the sound-absorbing cotton 273 attached to the inner wall during the flow process. This not only increases the time for the mid-to-high frequency airflow noise to be absorbed by the porous structure of the sound-absorbing cotton 273, but also allows the noise to be reflected and scattered multiple times in the tube through the continuous turning of the spiral path, so that the noise energy gradually attenuates.

[0040] Working principle: During operation, the machine tool body 1 starts running according to the preset program. The workpiece is processed by the spindle rotation and the feed system. During the process, a lot of noise is generated due to the spindle rotation, motor operation, friction between the tool and the workpiece, and airflow. At the same time, iron chips, cutting fluid splash and heat dissipation are also present. The noise generated by the machine tool body 1 will be constrained and absorbed by the outer noise reduction shell 2. The left noise reduction plate 21 and the right noise reduction plate 22 seal the left and right sides. The three-layer composite structure of cold-rolled steel plate 251, centrifugal glass wool 252 and perforated plate 253 works together. The inner perforated plate 253 guides the noise into the middle centrifugal glass wool 252. The centrifugal glass wool 252 absorbs low and medium frequency noise through its porous structure. The outer cold-rolled steel plate 251 reflects high frequency noise. Its surface damping coating suppresses the secondary noise generated by vibration. The adjacent air layer further blocks the sound waves. The connecting plate 23 is connected to the front end of the left noise reduction plate 21 and the right noise reduction plate 22. The water-swellable rubber strip in the stepped sealing groove normally seals the gaps and expands to seal the vibration gaps after encountering cutting fluid, thus preventing noise leakage caused by gaps. The embedded plate 24 is embedded in the machine tool body 1 through nitrile rubber shock-absorbing pads to absorb vibration energy to block vibration transmission and prevent the shell from resonating, while also helping to fix the shell; the top noise reduction plate 25 closes the top, and its three-layer structure works with the left noise reduction plate 21 and the right noise reduction plate 22 to block top noise. In summary, the enclosed noise reduction cavity formed by the five elements confines most of the noise inside, significantly reducing the noise that propagates outward.

[0041] The heat generated by the machine tool operation is discharged through the exhaust hole 26 of the top noise reduction plate 25. The noise carried by the airflow enters the silencer pipe 27 simultaneously. The protective pipe shell 271 provides protection and reduces leakage. The spiral sound-absorbing pipe 272 extends the propagation path of airflow and noise, causing it to reflect multiple times inside the pipe and fully contact the sound-absorbing cotton 273 on the inner wall. The sound-absorbing cotton 273 absorbs the mid-to-high frequency airflow noise and converts it into heat energy. Finally, the treated airflow is discharged, greatly reducing noise.

[0042] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0043] Those skilled in the art should understand that the above embodiments are merely for illustrative purposes and are not intended to limit the scope of this application. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of this application.

Claims

1. A noise-reducing CNC machining tool, characterized in that: Includes a machine tool body (1), and the outer side of the machine tool body (1) is covered with a noise reduction shell (2); The noise reduction shell (2) includes a left noise reduction plate (21) and a right noise reduction plate (22). The left noise reduction plate (21) and the right noise reduction plate (22) are covered on the left and right sides of the machine tool body (1), and a connecting plate (23) is fixedly installed at the front end of the two. An embedded plate (24) is fixedly installed at the bottom of the left noise reduction plate (21) and the right noise reduction plate (22). The embedded plate (24) is embedded in the bottom front end of the machine tool body (1). A top noise reduction plate (25) is fixedly installed at the top of the left noise reduction plate (21) and the right noise reduction plate (22). The left noise reduction plate (21), right noise reduction plate (22), connecting plate (23), embedded plate (24) and top noise reduction plate (25) together form a closed noise reduction cavity, and the machine tool body (1) is housed in the noise reduction cavity; The top of the noise reduction plate (25) has an exhaust hole (26) through it. A silencer pipe (27) is fixedly installed at the top of the top of the noise reduction plate (25) at the location where the exhaust hole (26) is opened. The silencer pipe (27) is connected to the exhaust hole (26).

2. The noise-reducing CNC machining tool according to claim 1, characterized in that: The left noise reduction plate (21), right noise reduction plate (22), connecting plate (23), embedded plate (24) and top noise reduction plate (25) are all three-layer composite sound insulation structures. They are only different in shape and installation position, but their structural composition is exactly the same.

3. The noise-reducing CNC machining tool according to claim 2, characterized in that: The top noise reduction plate (25) is a three-layer composite structure, consisting of a cold-rolled steel plate (251), centrifugal glass wool (252), and a perforated plate (253) from the outside to the inside. The three-layer composite structure is fixed by rivets, and an air layer is reserved between adjacent layers.

4. The noise-reducing CNC machining tool according to claim 3, characterized in that: The surface of the cold-rolled steel sheet (251) is coated with a damping coating.

5. The noise-reducing CNC machining tool according to claim 1, characterized in that: The silencer tube (27) includes a protective tube shell (271), which is fixedly installed on the top of the top noise reduction plate (25) at the position corresponding to the exhaust hole (26). A sound-absorbing tube (272) is embedded inside the protective tube shell (271), and the sound-absorbing tube (272) is connected to the exhaust hole (26). Sound-absorbing cotton (273) is attached inside the sound-absorbing tube (272).

6. The noise-reducing CNC machining tool according to claim 5, characterized in that: The sound-absorbing tube (272) has a spiral structure.

7. The noise-reducing CNC machining tool according to claim 1, characterized in that: The connection between the connecting plate (23) and the left noise reduction plate (21) and the right noise reduction plate (22) is provided with a stepped sealing groove, and the sealing groove is embedded with a water-swellable rubber strip.

8. The noise-reducing CNC machining tool according to claim 1, characterized in that: A nitrile rubber shock-absorbing pad is provided between the embedding plate (24) and the mounting surface of the machine tool body (1).

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