Parallel multi-channel numerical control machine tool with workpiece vibration detection structure

Abstract

The present application relates to a kind of parallel multi-channel numerical control machine tool with workpiece vibration detection structure, including base, top is connected with workbench by electric slide rail;Utilize the capsule in hollow air ring inside by air inlet tube inflation, after expansion, it is closely contacted with workpiece surface, form flexible contact, the vibration of workpiece when processing will extrude capsule, capsule deformation will make inside abutment plate move, abutment rod is close to pressure sensor with abutment plate and produce pressure, simultaneously because of the volume change of capsule, through conical amplification cavity amplification air pressure fluctuation, since the cross-sectional area of conical amplification cavity gradually reduces from capsule to hollow air ring direction, through cross-sectional area change amplification air pressure fluctuation generated by the volume change of capsule, air pressure sensor captures the fluctuation, and cooperate with fiber grating sensor swing and produce strain with abutment plate, utilize three kinds of sensor signal synchronous transmission to controller, after analysis, output vibration parameter, can also isolate cutting fluid, iron filings etc. Interference, ensure stable detection in harsh machining environment.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tools, and in particular to a parallel multi-channel CNC machine tool with a workpiece vibration detection structure. Background Technology

[0002] As the requirements for precision and efficiency in parts processing continue to increase in the high-end manufacturing sector, parallel multi-channel CNC machine tools, with their advantages of "multi-axis synchronous processing and centralized completion of multiple processes," are gradually becoming core processing equipment. These machine tools are usually equipped with multiple electric tool holders, which can process multiple workpieces at the same time, greatly improving production efficiency.

[0003] However, while parallel multi-channel CNC machine tools can process materials efficiently, their characteristics of multi-tool collaborative operation and multi-axis motion superposition also make the workpiece prone to vibration problems during the machining process. At present, although laser vibration meters and machine vision can be used to detect vibration of workpieces, they have strict requirements for the operating environment and are difficult to work stably in machining sites filled with cutting fluid and metal chips, thus affecting the detection effect. Summary of the Invention

[0004] Therefore, it is necessary to address the issue that while laser vibration meters and machine vision can effectively detect vibrations in workpieces, they have strict environmental requirements and are difficult to operate stably in machining environments filled with cutting fluid and metal chips, thus affecting the detection results. To address this, a parallel multi-channel CNC machine tool with a workpiece vibration detection structure should be provided, which can isolate interference from cutting fluid, metal chips, etc., and stably detect workpiece vibration data in harsh machining environments.

[0005] This invention provides a parallel multi-channel CNC machine tool with a workpiece vibration detection structure, comprising: The machine base has a worktable connected to the top via an electric slide rail; The frame is bolted between the two sides of the base; Three electric tool holders are slidably mounted on the front side of the frame via electric slide rails; The controller is bolted to the left side of the base; A workpiece support is bolted to the top of the worktable. An air ring is provided on the top of the workpiece support. Ball joint rods are bolted to the four corners of the top of the workpiece support, and the other end of the ball joint rods is bolted to the air ring. An annular bracket is bolted to the top of the workpiece support, and the annular bracket is coaxially arranged with the air ring. Several bladders are distributed in an annular shape at equal intervals on the inner side of the air ring. The inside of the capsule is bonded with an abutment plate, and an abutment rod is welded to the outside of the abutment plate. The inside of the capsule is provided with a conical amplification cavity, and the two ends of the conical amplification cavity are respectively located inside the capsule and the air ring. A pressure sensor is installed inside the conical amplification cavity, and a support plate is bolted to the inside of the other side of the conical amplification cavity. A pressure sensor is bolted to the inside of the support plate. The pressure sensor works in conjunction with the abutment rod. Two fiber optic grating sensors are hinged to the outside of the abutment plate, and the other end of the fiber optic grating sensor is hinged to the conical amplification cavity. The fiber optic grating sensor, the pressure sensor, and the air pressure sensor are all electrically connected to the controller. A ring-shaped bracket is bolted to the top of the workpiece support, and the ring-shaped bracket is coaxially arranged with the air ring. The intake pipe runs through the interior of the air ring, with the other end of the intake pipe located inside the bladder.

[0006] In one embodiment, the inner side of the capsule is provided with a plurality of integral protrusions, and the protrusions are distributed in a rectangular array on the inner side of the capsule. The top and bottom of the inner wall of the capsule are provided with foldable elastic skeletons, and both ends of the foldable elastic skeletons are connected to the inner wall of the capsule.

[0007] In one embodiment, the top of the bladder and the air ring are respectively connected to a connecting block and an internal threaded seat. The internal thread of the internal threaded seat passes through an adjusting stud, and the surface thread of the adjusting stud is fitted with a locking nut, which is in close contact with the side of the internal threaded seat closest to it.

[0008] In one embodiment, the adjusting stud is rotatably connected to a pressure plate on the side near the connecting block, and a positioning spring is connected between the pressure plate and the connecting block via a spring fixing member.

[0009] In one embodiment, a sealing seat is bolted inside the air intake pipe, a sealing block is in close contact inside the sealing seat, and a fixing seat is provided on the other side of the sealing block. An air intake channel is formed between the fixing seat and the air intake pipe, and a compression spring is connected between the sealing block and the fixing seat through a spring fixing member.

[0010] In one embodiment, an elastic rod is bolted between the support plate and the contact plate, and the elastic rod is arc-shaped and distributed in a ring between the support plate and the contact plate.

[0011] In one embodiment, the annular bracket has a movable rod rotatably connected inside in an annular shape. The top end of the movable rod is rotatably connected to a pressing block, and the bottom end of the movable rod is rotatably connected to a pushing rod, which is slidably disposed inside the workpiece support.

[0012] In one embodiment, a fixed cylinder is slidably sleeved on the surface of the push rod, a liquid distribution plate is bolted inside the workpiece support, and several guide frames are welded in a ring shape inside the liquid distribution plate, forming a liquid distribution channel between adjacent guide frames, and the fixed cylinder is connected to the liquid distribution channel.

[0013] In one embodiment, a push plate is slidably disposed inside the fixed cylinder, and one side of the push plate is bolted to a push rod. A return spring is sleeved on the surface of the push rod, and both sides of the return spring are connected to the push plate and the inner wall of the fixed cylinder respectively through elastic fasteners.

[0014] In one embodiment, the annular bracket has an annular notch inside, the movable rod is rotatably connected to the inside of the notch by a pin, and two guide rods are bolted to the side of the compression block near the annular bracket, with the other end of the guide rods passing through the annular bracket and slidably connected to it.

[0015] The aforementioned parallel multi-channel CNC machine tool with a workpiece vibration detection structure can fix the workpiece on the worktable via a ring bracket and workpiece support, preventing workpiece loosening during processing. The inner chamber of the air ring is inflated through an air inlet pipe, expanding to form a flexible contact with the workpiece surface. During processing, workpiece vibration compresses the chamber, causing deformation that moves the inner contact plate. The contact rod moves closer to the pressure sensor along with the contact plate, generating pressure. Simultaneously, the change in chamber volume amplifies the air pressure fluctuations through a conical amplification cavity. Since the cross-sectional area of ​​the conical amplification cavity gradually decreases from the chamber towards the air ring, the change in cross-sectional area amplifies the air pressure generated by the change in chamber volume. Pressure fluctuations are detected by a pressure sensor, which, in conjunction with a fiber optic grating sensor, generates strain as the contact plate oscillates. These three types of sensor signals are synchronously transmitted to the controller, which analyzes the data and outputs vibration parameters. Multi-sensor collaborative detection enables multi-dimensional verification of the vibration signal, avoiding misjudgments from a single sensor. The controller receives the signals from the three types of sensors and integrates the data through a signal fusion algorithm, eliminating interference from the machine tool's own vibrations and outputting parameters such as the amplitude and frequency of the workpiece vibration. This improves detection accuracy and effectiveness, while also isolating interference from cutting fluid, metal chips, etc., ensuring stable detection in harsh processing environments. This allows the machine tool to flexibly adjust its operating parameters based on the workpiece vibration. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1A schematic diagram of a parallel multi-channel CNC machine tool with a workpiece vibration detection structure provided by the present invention; Figure 2 A schematic diagram showing the connection between the workpiece support and the worktable structure provided by the present invention; Figure 3 This is a schematic diagram showing the connection between the air ring and the capsule structure provided by the present invention; Figure 4 A schematic diagram showing the connection between the capsule and the conical magnifying cavity structure provided by the present invention; Figure 5 A schematic diagram showing the connection of the intake pipe, air ring, and bladder structure provided by the present invention; Figure 6 This is a schematic diagram showing the connection between the annular bracket and the workpiece support structure provided by the present invention; Figure 7 This is a schematic diagram of the liquid distribution plate structure provided by the present invention.

[0018] Figure label: 100. Machine base; 110. Worktable; 120. Machine frame; 130. Electric tool holder; 140. Controller; 200. Workpiece support; 210. Air ring; 220. Ball joint support rod; 230. Capsule; 231. Protrusion; 232. Folding elastic frame; 233. Connecting block; 234. Internal thread seat; 235. Adjusting stud; 236. Pressure plate; 237. Positioning spring; 240. Contact plate; 250. Contact rod; 260. Conical enlargement cavity; 270. Air pressure sensor; 280. Pressure sensor; 290. Fiber optic grating sensor; 300. Ring bracket; 310. Movable rod; 320. Squeezing block; 330. Push rod; 340. Fixed cylinder; 350. Liquid distribution tray; 360. Guide frame; 370. Push plate; 380. Return spring; 400. Air inlet pipe; 410. Sealing seat; 420. Sealing block; 430. Fixed seat; 440. Compression spring; 500. Guide rod; 600. Elastic rod. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The following is combined Figures 1 to 7 This invention describes a parallel multi-channel CNC machine tool with a workpiece vibration detection structure.

[0021] like Figures 1 to 5As shown, in one embodiment, a parallel multi-channel CNC machine tool with a workpiece vibration detection structure includes: The machine base 100 has a worktable 110 connected to its top via an electric slide rail; The frame 120 is bolted between the two sides of the base 100; Three electric tool holders 130 are slidably mounted on the front side of the frame 120 via electric slide rails; Controller 140 is bolted to the left side of base 100; The workpiece support 200 is bolted to the top of the worktable 110. An air ring 210 is provided on the top of the workpiece support 200. Ball joint support rods 220 are bolted to the four corners of the top of the workpiece support 200, and the other end of the ball joint support rods 220 is bolted to the air ring 210. An annular bracket 300 is bolted to the top of the workpiece support 200, and the annular bracket 300 is coaxially arranged with the air ring 210. Several bladders 230 are distributed in an annular shape at equal intervals on the inner side of the air ring 210. An abutment plate 240 is bonded to the inside of the capsule 230, and an abutment rod 250 is welded to the outside of the abutment plate 240. A conical amplification cavity 260 is provided inside the capsule 230, and the two ends of the conical amplification cavity 260 are respectively located inside the capsule 230 and the air ring 210. A pressure sensor 270 is installed inside the conical amplification cavity 260, and a support plate is bolted to the inside of the other side of the conical amplification cavity 260. Pressure sensor 280 is bolted to the inside of the support plate. Pressure sensor 280 is used in conjunction with abutment rod 250. Two fiber Bragg grating sensors 290 are hinged to the outside of abutment plate 240. The other end of fiber Bragg grating sensor 290 is hinged to conical amplification cavity 260. Fiber Bragg grating sensor 290, pressure sensor 280 and air pressure sensor 270 are all electrically connected to controller 140. The annular bracket 300 is bolted to the top of the workpiece support 200, and the annular bracket 300 and the air ring 210 are coaxially arranged. The intake pipe 400 penetrates the interior of the air ring 210, and the other end of the intake pipe 400 is located inside the bladder 230.

[0022] The aforementioned parallel multi-channel CNC machine tool with a workpiece vibration detection structure can fix the workpiece on the worktable 110 via a ring bracket 300 and a workpiece support 200, preventing the workpiece from loosening during processing. The inner bladder 230 of the air ring 210 (made of a material resistant to cutting fluid corrosion and high temperature) is inflated through the air inlet pipe 400. After expansion, it makes close contact with the workpiece surface, forming a flexible contact. During processing, the vibration of the workpiece will compress the bladder 230, and the deformation of the bladder 230 will cause the inner contact plate 240 to move. The contact rod 250 moves with the contact plate 240 towards the pressure sensor 280 (a miniature piezoresistive pressure sensor with a measurement range of 0-500 kPa, an accuracy class of 0.1, and a response time ≤ 1 m). The output signal is a 4-20mA standard current signal. The sensor is shock-resistant and can withstand instantaneous impacts. Pressure is generated, and the pressure fluctuations are amplified by the change in volume of the capsule 230 through the conical amplification cavity 260. Since the cross-sectional area of ​​the conical amplification cavity 260 gradually decreases from the capsule 230 towards the air ring 210, the pressure fluctuations generated by the change in volume of the capsule 230 are amplified through this cross-sectional area change. The pressure sensor 270 (a microelectromechanical system (MEMS) pressure sensor, with a measurement range of 80-120kPa, absolute accuracy of ±0.1kPa, and a sampling rate of up to 1000Hz; the sensor has temperature compensation function, with a temperature error ≤±0.2 within the operating temperature range of -40℃ to 85℃) The vibration is captured by a fiber Bragg grating sensor 290 (using a Bragg fiber Bragg grating sensor with a working wavelength range of 1525-1565nm, a linearity error between the grating center wavelength drift and strain ≤±0.5%, a strain measurement range of -2000με to +2000με, a resolution ≤1με, a response frequency of 0-1kHz, and a stainless steel housing to resist corrosion from cutting fluid and iron filings). This sensor generates strain as it oscillates with the contact plate 240. The signals from these three sensors are synchronously transmitted to the controller 140, where they are analyzed and vibration parameters are output. Multi-sensor collaborative detection enables multi-dimensional verification of the vibration signal, avoiding misjudgments from a single sensor. The controller 140 receives signals from the three types of sensors. After receiving the signal from the machine tool, the data is integrated through a signal fusion algorithm to eliminate interference from the machine tool's own vibration and output parameters such as the amplitude and frequency of the workpiece vibration. This improves the detection accuracy and effect, and also isolates interference from cutting fluid, iron filings, etc., ensuring stable detection in harsh processing environments. This allows the machine tool to flexibly adjust its operating parameters according to the workpiece vibration. For example, when the vibration index exceeds 80% of the threshold, the CNC system will display a pop-up window on the operation interface and automatically fine-tune the cutting parameters (such as reducing the feed rate by ≤10%). When the vibration index exceeds the threshold but does not reach the danger value, the system will pause the current channel processing, retain other channels, and recommend optimizing the cutting parameters (such as increasing the depth of cut and decreasing the feed rate). When the vibration index exceeds 120% of the threshold, the system will immediately stop the machine.

[0023] In one embodiment, the inner side of the capsule 230 is provided with a plurality of integral protrusions 231, and the protrusions 231 are distributed in a rectangular array on the inner side of the capsule 230. The top and bottom of the inner wall of the capsule 230 are provided with foldable elastic skeletons 232, and both ends of the foldable elastic skeletons 232 are connected to the inner wall of the capsule 230.

[0024] Specifically, the protrusions 231 on the inner side of the capsule 230 form local point contact with the workpiece surface after inflation, increasing the squeezing force of the workpiece vibration on the capsule 230, amplifying the volume change of the capsule 230 and the displacement of the contact plate 240, and improving the sensor's sensitivity to capture minute vibrations. Meanwhile, the foldable elastic skeleton 232 expands and unfolds with the capsule 230 when it is inflated, maintaining the overall shape of the capsule 230 and avoiding vibration transmission distortion caused by excessive deformation of the capsule 230.

[0025] In one embodiment, the top of the bladder 230 and the air ring 210 are respectively connected to a connecting block 233 and an internal thread seat 234. The internal thread of the internal thread seat 234 passes through an adjusting stud 235. The surface thread of the adjusting stud 235 is fitted with a locking nut, and the locking nut is in close contact with the side of the internal thread seat 234 closest to it.

[0026] Specifically, since the internal thread seat 234 and the connecting block 233 are connected by the adjusting stud 235, the relative position of the bladder 230 and the air ring 210 can be adjusted by rotating the adjusting stud 235, which can adapt to workpieces of different diameters and expand the application range of the device. After the adjustment is in place, the adjusting stud 235 and the internal thread seat 234 are fixed by tightening the locking nut to prevent the position displacement caused by processing vibration and ensure the stability of the detection structure and the accuracy of vibration transmission.

[0027] In one embodiment, the adjusting stud 235 is rotatably connected to a pressure plate 236 on the side near the connecting block 233, and a positioning spring 237 is connected between the pressure plate 236 and the connecting block 233 via a spring fixing member.

[0028] Specifically, the positioning spring 237 provides adaptive elasticity compensation, ensuring that the capsule 230 remains tightly fitted when the workpiece vibrates or undergoes slight displacement, thus avoiding interruption of vibration transmission caused by gaps.

[0029] In one embodiment, a sealing seat 410 is bolted inside the air intake pipe 400, a sealing block 420 is in close contact inside the sealing seat 410, and a fixing seat 430 is provided on the other side of the sealing block 420. An air intake channel is formed between the fixing seat 430 and the air intake pipe 400, and a compression spring 440 is connected between the sealing block 420 and the fixing seat 430 through a spring fixing member.

[0030] Specifically, the sealing seat 410 inside the air inlet pipe 400 cooperates with the sealing block 420. When not inflated, the pressure spring 440 pushes the sealing block 420 to tightly contact the sealing seat 410, preventing air leakage from the bladder 230. When inflating, the airflow pressure pushes the sealing block 420 to compress the pressure spring 440, causing the sealing block 420 to separate from the sealing seat 410. The airflow enters the bladder 230 through the air intake channel formed by the fixed seat 430 and the air inlet pipe 400. After inflation stops, the pressure spring 440 resets and pushes the sealing block 420 to reseal, maintaining stable air pressure inside the bladder 230. The automatic sealing structure of the air inlet pipe 400 ensures constant air pressure inside the bladder 230, avoiding air pressure fluctuations from interfering with vibration detection (such as changes in the contact force between the bladder 230 and the workpiece due to air pressure leakage).

[0031] In one embodiment, an elastic rod 600 is bolted between the support plate and the contact plate 240, and the elastic rod 600 is arc-shaped and distributed in a ring between the support plate and the contact plate 240.

[0032] Specifically, the curved elastic rod 600 achieves both buffering and reset functions, protecting the pressure sensor 280 from impact and ensuring that the detection structure quickly returns to its initial state after vibration, thus improving detection continuity.

[0033] In one embodiment, the annular support 300 has a movable rod 310 rotatably connected inside in an annular shape. The top end of the movable rod 310 is rotatably connected to a pressing block 320, and the bottom end of the movable rod 310 is rotatably connected to a pushing rod 330. The pushing rod 330 is slidably disposed inside the workpiece support 200.

[0034] Specifically, the movable rod 310 inside the annular bracket 300 rotates via a pin. When the workpiece is placed, it pushes the push rod 330, which in turn drives the movable rod 310 to rotate around the pin. The pressing block 320 at the top of the movable rod 310 moves inward toward the annular bracket 300 to assist in clamping the workpiece, thereby fixing the workpiece and preventing it from shifting during processing.

[0035] In one embodiment, a fixed cylinder 340 is slidably sleeved on the surface of the push rod 330, a liquid distribution plate 350 is bolted inside the workpiece support 200, and a plurality of guide frames 360 are welded in an annular shape inside the liquid distribution plate 350, forming a liquid distribution channel between adjacent guide frames 360, and the fixed cylinder 340 is connected to the liquid distribution channel.

[0036] Specifically, the fixed cylinder 340 on the surface of the push rod 330 is connected to the liquid distribution plate 350 inside the workpiece support 200. The guide frame 360 ​​of the liquid distribution plate 350 forms a liquid distribution channel. During processing, external oil enters the fixed cylinder 340 through the liquid distribution channel. Under the action of oil pressure, the push plate 370 is pushed, which in turn drives the push rod 330 to move, assisting the movable rod 310 in clamping the workpiece. At the same time, multiple extrusion blocks 320 can move synchronously to achieve the effect of centering and clamping the workpiece. In addition, during the clamping process, in order to reduce the influence of the fixing force of the extrusion block 320 on the contact pressure of the capsule 230 and to balance the fixing stability and the accuracy of vibration result detection, the fixing force of the extrusion block 320 is precisely controlled within the range of 800-1500N by adjusting the oil pressure of the liquid distribution plate 350. This range can ensure that the workpiece has no displacement during high-speed cutting and multi-tool collaborative processing, and can also reserve sufficient deformation space for the capsule 230 to ensure the sensitivity of vibration transmission. Moreover, the extrusion block 320 The device is made of polyurethane elastic material, and the end face in contact with the workpiece is arc-shaped to increase the contact area and reduce local pressure concentration. At the same time, the rotation damping of the movable rod 310 is adjusted by the return spring 380 to make the fixing force transmission more uniform and avoid uneven contact pressure of the bladder 230 caused by excessive compression at a single point. During the detection process, with the synergistic effect of the positioning spring 237 inside the bladder 230 and the arc-shaped elastic rod 600, when there is a slight fluctuation in the fixing force of the extrusion block 320, the positioning spring 237 can compensate for the contact pressure of the bladder 230 by elastic extension and contraction, so that the contact pressure is maintained in the optimal detection range of 100-300kPa, avoiding the influence of the fixing force fluctuation on the detection. After the workpiece is fixed, the controller 140 automatically collects the initial signals of the pressure sensor 280 and the air pressure sensor 270 and stores them as reference values. During the processing, only the signal changes above the reference value are identified, eliminating the initial pressure interference caused by the fixing force and ensuring the accuracy of vibration signal detection.

[0037] In one embodiment, a push plate 370 is slidably disposed inside the fixed cylinder 340, and one side of the push plate 370 is bolted to the push rod 330. A return spring 380 is sleeved on the surface of the push rod 330, and both sides of the return spring 380 are connected to the push plate 370 and the inner wall of the fixed cylinder 340 respectively through elastic fasteners.

[0038] Specifically, the push rod 330 is automatically reset by the reset spring 380, thereby resetting the pressing block 320 and the movable rod 310, improving the ease of operation. In addition, the push plate 370 can limit the movement trajectory of the push rod 330, prevent deviation, and avoid the movable rod 310 from swinging and failing due to the tilt of the push rod 330.

[0039] In one embodiment, the annular bracket 300 has an annular notch inside, the movable rod 310 is rotatably connected to the inside of the notch by a pin, and the pressing block 320 is bolted with two guide rods 500 on the side near the annular bracket 300, and the other end of the guide rod 500 passes through the annular bracket 300 and is slidably connected to it.

[0040] Specifically, the notch design provides ample rotation space for the movable rod 310, ensuring that the movable rod 310 can swing as pushed by the push rod 330, while the guide rod 500 ensures that the extrusion block 320 can move in a directional manner, thus guaranteeing the fixing effect of the extrusion block 320 on the workpiece.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A parallel multi-channel CNC machine tool with a workpiece vibration detection structure, characterized in that, include: The base (100) has a worktable (110) connected to the top via an electric slide rail. The frame (120) is bolted between the two sides of the base (100); Three electric tool holders (130) are slidably mounted on the front side of the frame (120) via electric slide rails; The controller (140) is bolted to the left side of the base (100); A workpiece support (200) is bolted to the top of the worktable (110). An air ring (210) is provided on the top of the workpiece support (200). Ball joint rods (220) are bolted to the four corners of the top of the workpiece support (200), and the other end of the ball joint rods (220) is bolted to the air ring (210). An annular bracket (300) is bolted to the top of the workpiece support (200), and the annular bracket (300) is coaxially arranged with the air ring (210). Several bladders (230) are distributed in an annular shape at equal intervals on the inner side of the air ring (210). An abutment plate (240) is bonded to the inside of the capsule (230), and an abutment rod (250) is welded to the outside of the abutment plate (240). A conical amplification cavity (260) is provided inside the capsule (230), and the two ends of the conical amplification cavity (260) are respectively located inside the capsule (230) and the air ring (210). A pressure sensor (270) is installed inside the conical amplification cavity (260), and a support plate is bolted to the inside of the other side of the conical amplification cavity (260). A pressure sensor (280) is bolted to the inside of the support plate. The pressure sensor (280) is used in conjunction with the abutment rod (250). Two fiber optic grating sensors (290) are hinged to the outside of the abutment plate (240), and the other end of the fiber optic grating sensor (290) is hinged to the conical amplification cavity (260). The fiber optic grating sensor (290), the pressure sensor (280), and the air pressure sensor (270) are all electrically connected to the controller (140). A ring bracket (300) is bolted to the top of the workpiece support (200), and the ring bracket (300) is coaxially arranged with the air ring (210); The intake pipe (400) penetrates the interior of the air ring (210), and the other end of the intake pipe (400) is located inside the bladder (230).

2. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 1, characterized in that, The inner side of the capsule (230) is provided with a number of integral protrusions (231), and the protrusions (231) are distributed in a rectangular array on the inner side of the capsule (230). The top and bottom of the inner wall of the capsule (230) are provided with foldable elastic skeletons (232), and both ends of the foldable elastic skeletons (232) are connected to the inner wall of the capsule (230).

3. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 1, characterized in that, The top of the bladder (230) and the air ring (210) are respectively connected to a connecting block (233) and an internal thread seat (234). The internal thread of the internal thread seat (234) passes through an adjusting stud (235). The surface thread of the adjusting stud (235) is fitted with a locking nut, and the locking nut is in close contact with the side of the internal thread seat (234) near it.

4. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 3, characterized in that, The adjusting stud (235) is rotatably connected to a pressure plate (236) on the side near the connecting block (233), and a positioning spring (237) is connected between the pressure plate (236) and the connecting block (233) through a spring fixing member.

5. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 1, characterized in that, A sealing seat (410) is bolted inside the air intake pipe (400). A sealing block (420) is in close contact inside the sealing seat (410). A fixing seat (430) is provided on the other side of the sealing block (420). An air intake channel is formed between the fixing seat (430) and the air intake pipe (400). A compression spring (440) is connected between the sealing block (420) and the fixing seat (430) through a spring fixing member.

6. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 1, characterized in that, An elastic rod (600) is bolted between the support plate and the contact plate (240), and the elastic rod (600) is arc-shaped and distributed in a ring between the support plate and the contact plate (240).

7. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 1, characterized in that, The annular support (300) has a movable rod (310) rotatably connected inside in an annular shape. The top end of the movable rod (310) is rotatably connected to a pressing block (320), and the bottom end of the movable rod (310) is rotatably connected to a pushing rod (330). The pushing rod (330) is slidably disposed inside the workpiece support (200).

8. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 7, characterized in that, The surface of the push rod (330) is slidably fitted with a fixed cylinder (340), and the inside of the workpiece support (200) is bolted with a liquid distribution plate (350). The inside of the liquid distribution plate (350) is welded with several guide frames (360) in a ring shape, and a liquid distribution channel is formed between adjacent guide frames (360). The fixed cylinder (340) is connected to the liquid distribution channel.

9. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 8, characterized in that, A push plate (370) is slidably disposed inside the fixed cylinder (340), and one side of the push plate (370) is bolted to the push rod (330). A return spring (380) is sleeved on the surface of the push rod (330), and the two sides of the return spring (380) are respectively connected to the push plate (370) and the inner wall of the fixed cylinder (340) through elastic fasteners.

10. The parallel multi-channel CNC machine tool with a workpiece vibration detection structure according to claim 7, characterized in that, The annular bracket (300) has an annular notch inside. The movable rod (310) is rotatably connected to the inside of the notch by a pin. Two guide rods (500) are bolted to the side of the extrusion block (320) near the annular bracket (300), and the other end of the guide rod (500) passes through the annular bracket (300) and is slidably connected to it.

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