High-stability ultra-long main shaft of numerical control machine tool

Abstract

The invention discloses a high-stability ultra-long main shaft of a numerical control machine tool. The high-stability ultra-long main shaft comprises a shell I, a shell II and a rotating shaft, the first shell and the second shell are combined to form a main shaft shell, the rotating shaft penetrates into the main shaft shell, and a plurality of bearings are installed at the two ends of the rotating shaft. A first mounting part, a hollow part and a second mounting part are arranged in the main shaft shell, the hollow part at least accounts for 1 / 2 of the length of the main shaft shell, the first mounting part and the second mounting part are each provided with two clamping positions used for fixing bearings at intervals, and a sound sensor or / and a vibration sensor is / are arranged between the two clamping positions and used for detecting the states of the two bearings; the two opposite bearings located on the first installation part and the second installation part are located on the two sides of the hollowed-out part respectively, the hollowed-out part is defined to form a closed space, the first shell and the second shell are each provided with an air channel, one end of each air channel is connected with the hollowed-out part, and the other end of each air channel extends to the surface of the first shell and the surface of the second shell to be connected with an air nozzle. Gas is pumped out to form negative pressure in the hollow-out part, gas disturbance generated during rotation of the rotating shaft is reduced, gas in the hollow-out part is pumped out from the gas channel through an external device, negative pressure is formed in the hollow-out part, gas disturbance generated during rotation of the rotating shaft can be reduced, and the conditions of pressure rise caused by gas thermal expansion and the like can be reduced; and the stability of the spindle is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical control machine tools, in particular to an ultra-long spindle of a high-stability numerical control machine tool. Background Art

[0002] CNC machine tools are one of the commonly used equipment for precision machining of parts, and the spindle is an important component of CNC machine tools. It is mainly used to install fixtures to fix products and drive products to rotate and change positions;

[0003] At present, for large-volume products that need to be molded in one piece, the volume of the CNC machine tools required will also be very large. Among them, the spindle is a key component, and its structure and size will also be adjusted accordingly; the structure of the spindle is mainly composed of a housing, a rotating shaft, a pull rod and several bearings. Although the spindle is precise, its parts are relatively simple. For an extra-long spindle, there is still a lot of free space inside, which will make the internal airflow chaotic when it rotates, which is one of the reasons that affect the stability of the spindle;

[0004] If a spindle fails, it is relatively easy to repair for a small spindle, but it becomes very difficult for a long and large spindle. In addition, it is impossible to locate which bearing is damaged. Usually, it needs to be checked or replaced as a whole, which is very costly.

[0005] In addition, for large products that need to be formed in one piece, the manufacturing cost is very high. If the bearing is damaged during the processing, the spindle will run unstably. If a quick response cannot be made at this time, the product will be scrapped, resulting in huge losses. Summary of the invention

[0006] The object of the present invention is to provide an extra-long spindle for a high-stability CNC machine tool to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-stability super-long spindle for a CNC machine tool, comprising a housing first, a housing second and a rotating shaft;

[0009] The housing 1 and the housing 2 are combined to form a main shaft housing, the rotating shaft penetrates into the main shaft housing, and a plurality of bearings are installed at both ends of the rotating shaft;

[0010] The spindle housing is provided with a mounting portion 1, a hollow portion and a mounting portion 2, the hollow portion occupies at least 1 / 2 of the length of the spindle housing, the mounting portion 1 and the mounting portion 2 are both provided with two positions for fixing the bearings, and a sound sensor or / and a vibration sensor is provided between the two positions for detecting the status of the two bearings;

[0011] The two bearings located opposite to the mounting part one and the mounting part two are respectively located on both sides of the hollow part, so that the hollow part is enclosed to form a relatively closed space. The shell one and the shell two are both provided with air passages, one end of the air passages is connected to the hollow part, and the other end extends to the surface of the shell one and the shell two and is connected to the air nozzle. By extracting the gas, a negative pressure is formed in the hollow part, thereby reducing the gas disturbance generated when the shaft rotates.

[0012] According to a further technical solution, an alignment structure is provided between the shell one and the shell two.

[0013] A further technical solution also includes a brake assembly, which is located at the hollow portion.

[0014] According to a further technical solution, a controller is provided on the surface of the spindle housing, and the controller is electrically connected to the sensor and the brake assembly in the spindle housing respectively, and the sensor sends a signal to the controller to trigger the brake assembly to start.

[0015] According to a further technical solution, the brake assembly includes a magnetic part fixed on the rotating shaft, an iron core is provided on the outer periphery of the magnetic part, a coil is wound around the iron core, a groove adapted to the iron core is provided on the inner wall of the main shaft housing, the coil has a plurality of lead ends, the plurality of lead ends are connected through an electromagnetic valve, and the electromagnetic valve is connected to a controller.

[0016] According to a further technical solution, the brake assembly includes a magnetic conductive ring fixed on the rotating shaft, an electromagnetic ring 1 is provided on the outer periphery of the magnetic conductive ring, and a groove adapted to the electromagnetic ring 1 is provided on the inner wall of the main shaft housing.

[0017] According to a further technical solution, the two sides of the housing 1 and the housing 2 are respectively provided with corresponding card slots 1, and the card slots 1 are embedded with positioning blocks;

[0018] It also includes two arc-shaped brake parts, in which the electromagnetic part 2 is embedded. When the electromagnetic part 2 is energized, it repels the electromagnetic ring 1 and attracts the magnetic conductive ring. The two arc-shaped brake parts clamp the rotating shaft, and arc-shaped brake parts extend from both ends of the electromagnetic part 2 to contact the positioning block.

[0019] According to a further technical solution, a second clamping groove adapted to the two ends of the electromagnetic component is provided at the end surface of the positioning block, and a plurality of springs are provided in the second clamping groove.

[0020] According to a further technical solution, the rotating shaft extends out of the main shaft housing and is connected to a driving motor 1 through a pulley set, and a gear 1 is fixed at the end of the rotating shaft, the gear 1 is meshed with a gear 2, and the gear 2 is connected to a driving motor 2.

[0021] Beneficial effects of the present invention:

[0022] The present invention uses an external device to extract the gas from the hollow part through the airway to form a negative pressure inside the hollow part, which can reduce the gas disturbance generated when the shaft rotates and the pressure increase caused by the heat expansion of the gas, thereby further improving the stability of the main shaft.

[0023] In addition, the sensor is set inside the spindle, which can obtain the bearing data and spindle data more directly. If an abnormality occurs, it can quickly make a judgment and send a signal to the controller, allowing the system to brake to avoid greater damage to the workpiece.

[0024] Since sensors are provided at both mounting part one and mounting part two, the bearings at both ends can be monitored, which can reduce the time for troubleshooting and allow direct replacement. During the replacement process, due to the use of a split spindle housing, housing one and housing two can be opened in half, and then the shaft and bearing can be pulled out of the housing as a whole by suspension. At this time, the bearing has been exposed, and an external device can be used to fix the bearing for replacement, so the use of a split structure can be faster.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : A three-dimensional structural diagram of the present invention.

[0027] Figure 2 : The cross-sectional structure of the present invention Figure 1 .

[0028] Figure 3 : Disassembly diagram of the present invention.

[0029] Figure 4 : The cross-sectional structure of the present invention Figure 2 .

[0030] Figure 5 : The cross-sectional structure of the present invention Figure 3 .

[0031] Figure 6 : The positioning block installation structure diagram of the present invention.

[0032] Figure markings: 1-spindle housing, 11-shell one, 12-shell two, 13-mounting part one, 14-hollow part, 15-mounting part two, 16-positioning, 17-sensor, 18-airway, 2-rotating shaft, 3-bearing, 4-brake assembly, 41-magnetic ring, 42-electromagnetic ring one, 43-groove, 44-slot one, 45-positioning block, 46-arc brake part, 47-electromagnetic part two, 48-slot two, 49-spring, 51-pulley group, 52-drive motor one, 53-gear one, 54-gear two, 55-drive motor two. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Please refer to Figure 1-6 ;

[0035] The present invention aims to improve the stability of an extra-long spindle and to respond quickly to minimize losses when a fault occurs. The present invention specifically includes a spindle housing 1, a rotating shaft 2 and a plurality of bearings 3. The rotating shaft 2 penetrates into the spindle housing 1, and a plurality of bearings 3 are installed at both ends of the rotating shaft 2. The outer periphery of the bearing 3 is fixedly connected to the spindle housing. Structurally, the components of the extra-long spindle are not very different from those of an ordinary spindle, and the biggest difference lies in the size of the parts used and the length of the spindle.

[0036] In this embodiment, refer to Figure 2 and Figure 3 The spindle housing is composed of a housing 11 and a housing 2 12. In order to keep the inner walls of the housing 11 and the housing 2 12 consistent in flatness, the spindle housing 1 can be integrally formed by a CNC machine tool, and then divided into two parts by laser cutting to form the housing 1 11 and the housing 2 12. Of course, two pieces of metal can also be processed separately by a CNC machine tool. Before the housing 1 11 and the housing 2 12 are combined, liquid sealant can be applied at the connection between the two. After the two are combined, the liquid sealant can fill the small gap to keep it sealed to prevent external dust from entering.

[0037] In addition, according to the customized main shaft, a mounting portion 13, a hollow portion 14 and a mounting portion 2 15 are provided in the main shaft housing 1, and the hollow portion 14 occupies at least 1 / 2 of the length of the main shaft housing 1. The mounting portion 13 and the mounting portion 2 15 are both provided with two intervals of two clamping positions 16 for fixing the bearing 3, that is, two bearings 3 are respectively installed at both ends of the main shaft for supporting the main shaft. Due to the obstruction of the two bearings 3, the mounting portion 13, the mounting portion 2 15 and the hollow portion 14 are respectively divided into three spaces. A sound sensor 17 or / and a vibration sensor 17 is provided between the two clamping positions 16 in each mounting portion. The two bearings 3 opposite to the mounting portion 13 and the mounting portion 2 15 are respectively located on both sides of the hollow portion 14, so that The hollow portion 14 encloses a relatively closed space. It should be noted that during operation, the bearing 3 rotates, and the gas in the space enclosed by the mounting portion 13 and the mounting portion 2 15 is rarely able to enter the hollow portion 14. Therefore, the relative airtightness in the hollow portion 14 means that only less gas can flow in from the mounting portion 13 and the mounting portion 2 15 per unit time; there are even bearings 3 that can be made into seals in the prior art, which can maintain the airtightness of the space enclosed by the hollow portion 14 to the greatest extent; both the shell 1 11 and the shell 2 12 are provided with an air duct 18, one end of the air duct 18 is connected to the hollow portion 14, and the other end extends to the surface of the shell 11 and the shell 2 12 to be connected to the air nozzle.

[0038] The current small spindles have high precision and stability, but for large spindles, any small problem will be magnified and become an important factor affecting stability. The hollow portion 14 occupies a very large space. When the shaft 2 rotates, the airflow in the hollow portion 14 will be chaotic. As the temperature rises, the gas will expand and the internal pressure will increase. At this time, the gas disturbance is more severe, which will be accompanied by overall vibration and loud noise, affecting stability.

[0039] Based on the structure of the present invention, the spindle housing 1 is fixed and will not move independently during operation. The rotating shaft 2 is penetrated by a pull rod for fixing the clamp, and the rotating shaft 2 is driven to rotate by the driving assembly. At the same time, the gas in the hollow part 14 is extracted from the airway 18 through an external device to form a negative pressure inside it. It should be noted that the negative pressure formed by the hollow part 14 does not mean that the inside is vacuum. Since the two sides are surrounded by bearings 3, a small amount of gas will enter when the air is pumped. The negative pressure formed means that the flow rate of the extracted gas is greater than the flow rate of the incoming gas, and the incoming gas will be directly guided to the position of the airway 18, thereby reducing the impact on the rotation of the rotating shaft 2. Since the hollow part 14 forms a negative pressure, the gas disturbance generated when the rotating shaft 2 rotates, as well as the pressure increase caused by the thermal expansion of the gas, can be reduced, so that the stability of the spindle is further improved.

[0040] In addition, it is impossible to predict when the bearing 3 will be damaged during operation. Although there are already solutions for detecting the bearing 3 in the existing technology, they have not been applied to the spindle, and the current testing method is mostly external, and the bearing 3 cannot be directly detected through the shell. In this embodiment, before manufacturing the spindle, the noise data of various situations when the bearing 3 is damaged and the vibration data of the spindle when it is working are obtained in advance, wherein the noise data and the vibration data need to be further processed to distinguish the noise generated by the product when the product is processed at work; the sound sensor 17 and the vibration sensor 17 in this embodiment can be provided at the same time or one of them can be selected. These sensors 17 are arranged inside the spindle, and can more directly obtain the bearing 3 data and the spindle data. If an abnormality occurs, a judgment can be made quickly and a signal can be sent to the controller, so that the system can perform a braking action to avoid greater damage to the workpiece;

[0041] Since sensors 17 are provided on both mounting portion 13 and mounting portion 2 15, bearings 3 at both ends can be monitored, and the system can know which position of bearing 3 is damaged, which can reduce the time for troubleshooting and directly replace it. The traditional method is to pull them out one by one from the end of the shell for replacement. This is still possible for small spindles, but for large spindles, a single bearing 3 is very heavy and cannot be pulled out individually. During the replacement process, this embodiment adopts a split spindle housing 1, so that shell 1 11 and shell 2 12 can be opened in half, and then the rotating shaft 2 and bearing 3 can be pulled out of the shell as a whole by suspension. At this time, bearing 3 has been exposed, and an external device can be used to fix bearing 3 for replacement, so the use of a split structure can be faster, especially for bearing 3 located on the inside.

[0042] It should be noted that, since the sensor 17 is disposed in the mounting portion 13 and the mounting portion 2 15 , a wire outlet hole should be reserved in the housing for the wires of the sensor 17 to pass through, and the housing should be well sealed.

[0043] In the embodiment of the present invention, an alignment structure is provided between shell one 11 and shell two 12, wherein the alignment structure can be two positioning blocks 45, which are respectively located on both sides of shell one 11 and shell two 12, and positioning grooves are respectively provided on both sides of shell one 11 and shell two 12. The engagement of the positioning blocks 45 and the positioning grooves can not only ensure the accurate alignment of shell one 11 and shell two 12, but also avoid the mutual misalignment and movement during the working process.

[0044] In the above scheme, the main shaft should also be used in conjunction with the brake assembly 4 to brake the main shaft. In the prior art, the brake assembly 4 is generally installed on the outside and connected to the end of the rotating shaft 2. There are usually two types of "caliper type" and "magnetic bonding". The "caliper type" is equivalent to clamping and fixing the brake disc, and cannot achieve the effect of instant braking. The "magnetic bonding" method is similar to the "caliper type", the difference is that it uses magnetic drive, which can achieve a very short braking effect; but no matter which braking method is used, its main function is the end of the rotating shaft 2; for general main shafts This method is undoubtedly a good braking option, but for an extra-long spindle, the quality of the product to be processed is very large. The length of the shaft 2 is more than twice that of a conventional shaft 2. If end braking is used, the torque difference between the two ends of the shaft 2 is very large, and the shaft 2 is prone to break in the middle. For this reason, the brake assembly 4 in the present invention is arranged inside the spindle and located at the hollow portion 14. By changing the position of the brake and shortening the distance between the brake position and the end, the shaft 2 has higher strength and better rigidity to offset the deformation caused by the torque and reduce the risk of breakage.

[0045] The present invention lists two embodiments of the brake assembly 4, both of which use magnetic methods, so the spindle housing 1, the rotating shaft 2 and other metal parts should be made of non-magnetic materials, such as non-magnetic aluminum alloy;

[0046] In the first embodiment, the brake assembly 4 includes a magnetic part fixed on the rotating shaft 2, and the magnetic part can be a circular ring. Preferably, an embedding groove adapted to the magnetic part is provided on the rotating shaft 2, so that the magnetic part is flush with the surface of the rotating shaft 2, and the eccentric force generated when the rotating shaft 2 rotates is reduced. An iron core is provided at the periphery of the magnetic part, and a coil is wound in the iron core. Preferably, a film is provided at the periphery of the iron core and the coil to wrap the whole. A groove adapted to the iron core is provided on the inner wall of the spindle housing 1. The coil has a plurality of lead ends, and the plurality of lead ends are connected through an electromagnetic valve, and the electromagnetic valve is connected to the controller;

[0047] In this embodiment, the magnetic part itself is magnetic. During the rotation of the shaft 2, the magnetic part will also rotate with it, and at the same time, the wire will cut the magnetic flux lines. Since the wire is disconnected, no current can be formed, so the iron core is not magnetic. When emergency braking is required, the solenoid valve is closed through the controller. At this time, the wire is connected. At the moment of connection, the wire will also cut the magnetic flux lines to form an induced current. The generation of the induced current will cause the iron core to produce a magnetism opposite to that of the magnetic part, forming an attractive state to achieve braking. As long as the solenoid valve remains connected and the shaft 2 rotates, an induced current will be generated, maintaining the braking state, and the effect of instantaneous braking can also be achieved. Of course, after the control system triggers the solenoid valve to be turned on, the drive component located outside should also stop moving synchronously.

[0048] The relevant structures in this embodiment may refer to the second implementation mode.

[0049] Implementation method 2: This implementation method is a variation of implementation method 1, and the specific structure is the same. Figure 4 The brake assembly 4 includes a magnetic ring 41 fixed on the rotating shaft 2. Preferably, an embedded groove adapted to the magnetic ring 41 is provided on the rotating shaft 2, so that the magnetic ring 41 is flush with the surface of the rotating shaft 2 to reduce the eccentric force generated when the rotating shaft 2 rotates. An electromagnetic ring 42 is provided on the outer periphery of the magnetic ring 41, and a groove 43 adapted to the electromagnetic ring 42 is provided on the inner wall of the spindle housing 1. In this embodiment, the electromagnetic ring 42 has an output end connected to an external controller;

[0050] In this embodiment, the magnetic ring 41 itself is not magnetic, and the electromagnetic ring 42 is also non-magnetic under normal conditions. When emergency braking is required, the controller triggers the switch to energize the electromagnetic ring 42, causing it to generate magnetism in a fixed direction to instantly adsorb the magnetic ring 41 and stop rotating. Of course, after the control system triggers the solenoid valve to turn on, the external drive component should also stop moving synchronously.

[0051] Although the above two embodiments can stop the rotating shaft 2 from rotating in a very short time to achieve the braking effect, the above scheme is a contactless braking. After braking, the rotating shaft 2 will have a swinging motion, which may cause the knife to hit. Therefore, it is further expanded based on the second embodiment;

[0052] Also includes two arc-shaped brake members 46, refer to Figure 3 , Figure 5 and Figure 6 Corresponding card slots 44 are respectively provided on both sides of the shell 11 and the shell 2 12, and the card slot 44 is embedded with a positioning block 45. In addition to the effect of aligning the shell 11 and the shell 2 12, the positioning block 45 can also limit the rotation of the arc-shaped brake member 46. In this embodiment, the arc-shaped brake block is made of rubber material and embedded with the electromagnetic member 2 47. The inner diameter curvature of the arc-shaped brake block is adapted to the curvature of the surface of the rotating shaft 2. The electromagnetic member 2 47 extends out of the arc-shaped brake member 46 and can contact the end face of the positioning block 45.

[0053] Preferably, even when in the braking state, part of the arc-shaped brake member 46 is still in the groove 43, which serves as a guide for resetting, and the two sides of the arc-shaped brake member 46 are in contact with the groove 43, and the friction force can be used to keep it fixed in the groove 43 in the absence of external force. Moreover, it is made of rubber material, which can absorb vibration and reduce noise generation.

[0054] In this embodiment, the function of the electromagnetic ring 1 42 is not mainly to magnetically attract the magnetic ring 41 to produce a braking effect, but to generate a repulsive force on the electromagnetic part 2 47 and push it to move in the direction of the rotating shaft 2; when braking is required, opposite currents are passed through the electromagnetic ring 1 42 and the electromagnetic part 2 47 to make the two repel each other, and at the same time, the electromagnetic part 2 47 magnetizes the magnetic ring 41 and attracts each other. Under the limitation of the positioning block 45, the electromagnetic part 2 47 will not rotate, but will move in the direction of the rotating shaft 2 due to the repulsive force generated by the electromagnetic part 2 47. The magnetic field generated at the moment when the electromagnetic part 2 47 is energized will attract the magnetic ring 41 and stop the rotation of the rotating shaft 2. At the same time, under the action of the strong repulsive force, the two arc-shaped brake parts 46 contact the rotating shaft 2 to form a clamping state, thereby achieving instant braking without the rotating shaft 2 swinging.

[0055] When the clamping state needs to be released, the second electromagnetic member 47 is disconnected while the first electromagnetic ring 42 remains energized, so that the second electromagnetic member 47 can be attracted and moved away from the rotating shaft 2, so that the arc-shaped brake member 46 is separated from the rotating shaft 2.

[0056] In another embodiment, a second card slot 48 adapted to the end of the second electromagnetic member 47 is provided at the end face of the positioning block 45, and a plurality of springs 49 are provided in the second card slot 48. It should be noted that the positioning block 45 and the springs 49 are both made of non-magnetic metal; when braking is required, opposite currents are passed through the electromagnetic ring 42 and the second electromagnetic member 47 to repel each other, and the second electromagnetic member 47 moves toward the direction of the rotating shaft 2. At the same time, the two ends of the electromagnetic member 47 compress the springs 49 respectively and embed them into the second card slot 48 of the positioning block 45 for positioning. When the clamping state needs to be released, the current between the second electromagnetic member 47 and the electromagnetic ring 42 is disconnected, and the electromagnetic ring 42 is pushed upward under the action of the spring 49, so that the arc-shaped brake member 46 is separated from the rotating shaft 2.

[0057] Of course, the solution of using the spring 49 can also be used in combination with the solution of "energizing the electromagnetic ring 1 42 to adsorb the electromagnetic member 2 47".

[0058] Based on the above embodiment, a controller is provided on the surface of the spindle housing 1, and the controller is electrically connected to the sensor 17 and the brake assembly 4 in the spindle housing 1 respectively. The sensor 17 sends a signal to the controller to trigger the brake assembly 4 to start. The spindle, the brake assembly 4 and the controller are integrated together, and the subsequent installation process can be omitted, which is more cost-effective. After the sensor 17 in the spindle detects an abnormality and sends it to the controller, the controller can directly trigger the braking device and feedback information to the main control system at the same time. There is no need for complex calculation feedback, and the response speed is faster. A single spindle is equivalent to a small system and does not need to be triggered by the main control system.

[0059] In the embodiment of the present invention, referring to Figure 1, the rotating shaft 2 extends out of the spindle housing 1 and is connected to the driving motor 1 52 through a pulley set 51, and a gear 1 53 is fixed at the end of the rotating shaft 2, and the gear 1 53 is meshed with a gear 2 54, and the gear 2 54 is connected to the driving motor 2 55; for a small spindle, the driving motor can accurately control the torque to keep the speed as constant as possible, but for a large rotating shaft 2, due to the large volume of the workpiece and the large rotational inertia, it is difficult to control the speed to be constant, and the constant speed is an important indicator for the precise processing of the product. For this reason, an auxiliary driving motor 2 55 is added, and the speed of the spindle is detected by the main control system. At this time, the driving motor 2 55 is passively followed and rotated. When the system detects that the speed drops during the processing, the driving motor 2 55 is started as torque compensation, and the speed is constant through the precise dynamic control of the system, and the stability is higher.

[0060] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-stability super-long spindle for CNC machine tools, characterized by: It comprises a housing 1 (11), a housing 2 (12) and a rotating shaft (2); The housing 1 (11) and the housing 2 (12) are combined to form a main shaft housing (1), the rotating shaft (2) is inserted into the main shaft housing (1), and a plurality of bearings (3) are installed at both ends of the rotating shaft (2); The spindle housing (1) is provided with a first mounting portion (13), a hollow portion (14) and a second mounting portion (15), wherein the hollow portion (14) occupies at least 1 / 2 of the length of the spindle housing (1), and the first mounting portion (13) and the second mounting portion (15) are both provided with two intervals between them for fixing the bearing (3), and a sound sensor (17) or / and a vibration sensor (17) is provided between the two intervals for detecting the status of the two bearings (3); Two bearings (3) located opposite to the first mounting portion (13) and the second mounting portion (15) are respectively located on both sides of the hollow portion (14), so that the hollow portion (14) is enclosed to form a relatively closed space. The first shell (11) and the second shell (12) are both provided with an air passage (18), one end of the air passage (18) is connected to the hollow portion (14), and the other end extends to the surface of the first shell (11) and the second shell (12) and is connected to the air nozzle. By extracting gas, a negative pressure is formed in the hollow portion (14), thereby reducing the gas disturbance generated when the rotating shaft (2) rotates.

2. The high-stability super-long spindle of a CNC machine tool according to claim 1, characterized in that: A positioning structure is provided between the shell one (11) and the shell two (12).

3. The high-stability super-long spindle of a CNC machine tool according to claim 1, characterized in that: It also includes a brake assembly (4), wherein the brake assembly (4) is located at the hollow portion (14).

4. The high-stability super-long spindle of a CNC machine tool according to claim 3, characterized in that: A controller is provided on the surface of the spindle housing (1), and the controller is electrically connected to a sensor (17) and a brake assembly (4) in the spindle housing (1), respectively, and the sensor (17) sends a signal to the controller to trigger the brake assembly (4) to start.

5. The high-stability super-long spindle of a CNC machine tool according to claim 3, characterized in that: The brake assembly (4) comprises a magnetic part fixed on the rotating shaft, an iron core is arranged on the outer periphery of the magnetic part, a coil is wound around the iron core, a groove adapted to the iron core is arranged on the inner wall of the main shaft housing, the coil has a plurality of lead ends, the plurality of lead ends are connected via an electromagnetic valve, and the electromagnetic valve is connected to a controller.

6. The high-stability super-long spindle of a CNC machine tool according to claim 3, characterized in that: The brake assembly (4) comprises a magnetic conductive ring (41) fixed on the rotating shaft (2), an electromagnetic ring (42) is arranged on the outer periphery of the magnetic conductive ring (41), and a groove (43) adapted to the electromagnetic ring (42) is arranged on the inner wall of the main shaft housing (1).

7. The high-stability super-long spindle of a CNC machine tool according to claim 6, characterized in that: The two sides of the housing 1 (11) and the housing 2 (12) are respectively provided with corresponding card slots 1 (44), and the card slots 1 (44) are embedded with positioning blocks (45); It also includes two arc-shaped brake components (46), wherein the arc-shaped brake block has an electromagnetic component 2 (47) embedded therein. When the electromagnetic component 2 (47) is energized, it repels the electromagnetic ring 1 (42) and attracts the magnetic conductive ring (41). The two arc-shaped brake components (46) clamp the rotating shaft (2). Arc-shaped brake components (46) extending from both ends of the electromagnetic component 2 (47) can contact the positioning block (45).

8. The high-stability super-long spindle of a CNC machine tool according to claim 7, characterized in that: A second clamping groove (48) adapted to the end of the second electromagnetic member (47) is provided at the end surface of the positioning block (45), and a plurality of springs (49) are provided in the second clamping groove (48).

9. The high-stability super-long spindle of a CNC machine tool according to claim 1, characterized in that: The rotating shaft (2) extends out of the main shaft housing (1) and is connected to a driving motor 1 (52) through a pulley set (51), and a gear 1 (53) is fixedly arranged at the end of the rotating shaft (2), the gear 1 (53) is meshed with a gear 2 (54), and the gear 2 (54) is connected to a driving motor 2 (55).

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