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

Abstract

The parallel multi-channel numerical control machine tool with the workpiece vibration detection structure comprises a machine base, and the top of the machine base is connected with a working table top through an electric sliding rail; a bag body on the inner side of a hollow air ring is inflated and expanded through an air inlet pipe and then makes close contact with the surface of a workpiece to form flexible contact, vibration of the workpiece can extrude the bag body in the machining process, the bag body deforms to enable an inner side abutting plate to move, and an abutting rod gets close to a pressure sensor along with the abutting plate and generates pressure; meanwhile, atmospheric pressure fluctuation is released through the conical amplification cavity due to the volume change of the capsule, the sectional area of the conical amplification cavity is gradually reduced from the capsule to the hollow air ring, the atmospheric pressure fluctuation generated by the volume change of the capsule is amplified through the change of the sectional area, and the atmospheric pressure sensor captures the fluctuation and cooperates with the fiber grating sensor to swing along with the propping plate to generate strain; signals of the three types of sensors are synchronously transmitted to the controller, vibration parameters are output after analysis, meanwhile, interference of cutting fluid, scrap iron and the like can be isolated, and stable detection in a severe machining environment is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of numerical control machine tools, in particular to a parallel multi-channel numerical control machine tool with workpiece vibration detection structure. BACKGROUND

[0002] With the continuous improvement of the requirements of high-end manufacturing field on part processing precision and efficiency, parallel multi-channel numerical control machine tool gradually becomes the core processing equipment with the advantages of "multi-axis synchronous machining, multi-process concentrated completion". Such machine tools are usually equipped with multiple electric knife holders, which can process multiple workpieces at the same time, greatly improving production efficiency.

[0003] However, while the parallel multi-channel numerical control machine tool is efficient, its multi-knife holder cooperative operation and multi-axis motion superposition characteristics also cause vibration problems in the workpiece processing process. Currently, laser vibration meters and machine vision are used to detect workpiece vibration, which can better detect vibration, but the use environment is strict, and it is difficult to work stably in the processing site full of cutting fluid and metal chips, thereby affecting the detection effect. SUMMARY

[0004] Therefore, it is necessary to provide a parallel multi-channel numerical control machine tool with workpiece vibration detection structure, which can isolate cutting fluid, iron filings and other interference, and stably detect workpiece vibration data in harsh machining environment.

[0005] The present application provides a parallel multi-channel numerical control machine tool with workpiece vibration detection structure, comprising: A machine base is connected to the top of the workbench by an electric sliding rail; A rack is connected between the two sides of the machine base; Three electric knife holders are slidably arranged on the front side of the rack by an electric sliding rail; A controller is connected to the left side of the machine base; A workpiece support is connected to the top of the workbench, the top of the workpiece support is provided with a hollow air ring, the four corners of the top of the workpiece support are connected with ball hinge support rods, the other end of the ball hinge support rod is connected with the hollow air ring, the top of the workpiece support is connected with a ring-shaped support, and the ring-shaped support is coaxially arranged with the hollow air ring, and the inner side of the hollow air ring is annularly and equidistantly distributed with a plurality of capsules. The inside of the capsule body is bonded with a contact plate, the outside of the contact plate is welded with a contact rod, the inside of the capsule body is provided with a tapered amplification cavity, and the two ends of the tapered amplification cavity are respectively located in the inside of the capsule body and the hollow air ring, the inside of the tapered amplification cavity is provided with an air pressure sensor, and the inside of the other side of the tapered amplification cavity is bolted with a support plate; A pressure sensor is bolted on the inside of the support plate, the pressure sensor is used in cooperation with the contact rod, the outside of the contact plate is hinged with two fiber grating sensors, and the other end of the fiber grating sensor is hinged with the tapered amplification cavity, and the fiber grating sensor, the pressure sensor and the air pressure sensor are electrically connected with the controller; An annular support is bolted on the top of the workpiece support, and the annular support is coaxially arranged with the hollow air ring. An air inlet pipe penetrates the inside of the hollow air ring, and the other end of the air inlet pipe is located in the inside of the capsule body.

[0006] In one embodiment, the inside of the capsule body is provided with a plurality of protrusions integrated therewith, and the protrusions are arranged in a rectangular array on the inside of the capsule body, the top and bottom of the inner wall of the capsule body are provided with folded elastic skeletons, and the two ends of the folded elastic skeletons are connected with the inner wall of the capsule body.

[0007] In one embodiment, the top of the capsule body and the hollow air ring is respectively connected with a connecting block and an internal threaded seat, the internal threads of the internal threaded seat penetrate the adjusting stud, the surface of the adjusting stud is threadedly sleeved with a locking nut, and the side close to the internal threaded seat is in close contact with the internal threaded seat.

[0008] In one embodiment, the side close to the connecting block of the adjusting stud is rotationally connected with a pressing plate, and the pressing plate and the connecting block are connected with a positioning spring through a spring fixing piece.

[0009] In one embodiment, the inside of the air inlet pipe is bolted with a plugging seat, the inside of the plugging seat is in close contact with a plugging block, the other side of the plugging block is provided with a fixing seat, the fixing seat and the air inlet pipe form an air inlet channel, and the plugging block and the fixing seat are connected with a pressing spring through a spring fixing piece.

[0010] In one embodiment, the support plate and the contact plate are bolted with an elastic rod, the elastic rod is arranged in an arc shape and is annularly distributed between the support plate and the contact plate.

[0011] In one embodiment, the inside of the annular support is rotationally connected with a movable rod in a ring shape, the top end of the movable rod is rotationally connected with a pressing block, the bottom end of the movable rod is rotationally connected with a pushing rod, and the pushing rod is slidingly arranged in the inside of the workpiece support.

[0012] In one embodiment, the surface of the push rod is sleeved with a fixed cylinder, the inside of the workpiece support is bolted with a distribution disc, and the inside of the distribution disc is annularly welded with a plurality of guide frames, forming a distribution channel between adjacent guide frames, and the fixed cylinder is in communication with the distribution channel.

[0013] In one embodiment, the inside of the fixed cylinder is slidably provided with a push plate, one side of the push plate is bolted with the push rod, the surface of the push rod is sleeved with a return spring, and the two sides of the return spring are connected with the push plate and the inner wall of the fixed cylinder through elastic fixing members.

[0014] In one embodiment, the inside of the annular support is annularly provided with a notch, the movable rod is rotatably connected inside the notch through a pin shaft, and the side close to the annular support of the extrusion block is bolted with two guide rods, and the other end of the guide rod penetrates through the annular support and is slidably connected therewith.

[0015] The above-mentioned parallel multi-channel numerical control machine tool with workpiece vibration detection structure can fix and install the workpiece on the workbench surface through the annular support and the workpiece support, prevent the workpiece from loosening during machining, inflate the capsule in the hollow air ring through the air inlet pipe, and form flexible contact after expansion. The vibration of the workpiece during machining will extrude the capsule, and the deformation of the capsule will move the inside abutting plate, and the abutting rod will move close to the pressure sensor with the abutting plate and generate pressure. At the same time, due to the change of the cross-sectional area of the tapered amplification cavity from the capsule to the hollow air ring, the air pressure fluctuation caused by the change of the volume of the capsule is amplified, and the air pressure sensor captures the fluctuation and cooperates with the fiber grating sensor to generate strain with the abutting plate. The three types of sensor signals are transmitted to the controller synchronously, and the vibration parameters are output after analysis. The multi-sensor cooperative detection realizes multi-dimensional verification of the vibration signal, avoids the misjudgment of a single sensor, and the controller receives the three types of sensor signals, integrates the data through a signal fusion algorithm, eliminates the vibration interference of the machine tool itself, and outputs the amplitude and frequency of the workpiece vibration. The detection accuracy and effect are improved, and the cutting fluid, iron filings and other interference are isolated, ensuring stable detection in harsh machining environment, so that the machine tool can flexibly adjust the operation parameters according to the vibration of the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[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 with 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 numerical control machine tool with workpiece vibration detection structure comprises: A machine base 100, a workbench top 110 is connected to the top of the machine base 100 through an electric slide rail; A machine frame 120 is bolted between the two sides of the machine base 100; Three electric knife holders 130 are slidingly arranged on the front side of the machine frame 120 through an electric slide rail; A controller 140 is bolted to the left side of the machine base 100; A workpiece support 200 is bolted to the top of the workbench top 110, the top of the workpiece support 200 is provided with a hollow air ring 210, the four corners of the top of the workpiece support 200 are bolted with spherical hinge support rods 220, and the other end of the spherical hinge support rod 220 is bolted with the hollow air ring 210, the top of the workpiece support 200 is bolted with a ring-shaped support 300, and the ring-shaped support 300 is coaxially arranged with the hollow air ring 210, and the inner side of the hollow air ring 210 is annularly and equidistantly distributed with a plurality of capsules 230; The inside of the capsule 230 is bonded with a contact plate 240, the outside of the contact plate 240 is welded with a contact rod 250, the inside of the capsule 230 is provided with a tapered amplification cavity 260, and the two ends of the tapered amplification cavity 260 are respectively located in the inside of the capsule 230 and the hollow air ring 210, the inside of the tapered amplification cavity 260 is provided with a gas pressure sensor 270, and the inside of the other side of the tapered amplification cavity 260 is bolted with a support plate; A pressure sensor 280 is bolted to the inside of the support plate, the pressure sensor 280 is used in cooperation with the contact rod 250, the outside of the contact plate 240 is hinged with two fiber Bragg grating sensors 290, and the other end of the fiber Bragg grating sensor 290 is hinged with the tapered amplification cavity 260, the fiber Bragg grating sensor 290, the pressure sensor 280 and the gas pressure sensor 270 are all electrically connected with the controller 140; A ring-shaped support 300 is bolted to the top of the workpiece support 200, and the ring-shaped support 300 is coaxially arranged with the hollow air ring 210; An air inlet pipe 400 penetrates the inside of the hollow air ring 210, and the other end of the air inlet pipe 400 is located in the inside of the capsule 230.

[0022] The parallel multi-channel numerical control machine tool with the workpiece vibration detection structure can fix and install the workpiece on the workbench surface 110 through the annular support 300 and the workpiece support 200, can prevent the workpiece from loosening during machining, and can form flexible contact by inflating the capsule 230 in the hollow air ring 210 (selected from a material resistant to cutting fluid corrosion and high temperature) through the air inlet pipe 400, and after expansion, the capsule 230 is in close contact with the surface of the workpiece. During machining, the vibration of the workpiece will extrude the capsule 230, and the deformation of the capsule 230 will make the inner abutment plate 240 move, and the abutment rod 250 will move towards the pressure sensor 280 (a micro piezoresistive pressure sensor with a measurement range of 0-500 kPa, an accuracy level of 0.1, a response time of ≤1 ms, and an output signal of 4-20 mA standard current signal. The sensor has impact resistance and can withstand instantaneous impact) and generates pressure, and at the same time, the volume change of the capsule 230 is amplified by the tapered amplification cavity 260. Because the cross-sectional area of the tapered amplification cavity 260 gradually decreases from the capsule 230 to the hollow air ring 210, the air pressure fluctuation caused by the volume change of the capsule 230 is amplified by the change of the cross-sectional area. The air pressure sensor 270 (selected from a micro-electro-mechanical system (MEMS) air pressure sensor with a measurement range of 80-120 kPa, an absolute accuracy of ±0.1 kPa, and a sampling rate of up to 1000 Hz; the sensor has a temperature compensation function, and the temperature error is ≤±0.2 kPa within a working temperature range of -40°C to 85°C) captures the fluctuation, and cooperates with the fiber Bragg grating sensor 290 (selected from a Bragg fiber Bragg grating sensor with a working wavelength range of 1525-1565 nm, a grating center wavelength drift amount and a strain measurement range of -2000 με to +2000 με, a resolution of ≤1 με, a response frequency of 0-1 kH, and a sensor shell made of stainless steel, which can resist the corrosion of cutting fluid and iron filings) to generate strain with the abutment plate 240. The three types of sensor signals are transmitted to the controller 140 simultaneously, and the vibration parameters are output after analysis. The multi-sensor cooperative detection realizes multi-dimensional verification of the vibration signal, avoids misjudgment of a single sensor, and the controller 140 receives the three types of sensor signals, integrates the data through a signal fusion algorithm, eliminates the vibration interference of the machine tool itself, and outputs the amplitude and frequency of the workpiece vibration. The detection accuracy and effect are improved, and the cutting fluid, iron filings and other interference are isolated, ensuring stable detection in harsh machining environments, so that the machine tool can flexibly adjust the operating parameters according to the vibration of the workpiece. When the vibration index exceeds 80% of the threshold value, the numerical control system pops up a prompt on the operation interface, and automatically adjusts the cutting parameters (such as reducing the feed rate by ≤10%).

[0023] In an embodiment, the inner side of the capsule 230 is provided with a plurality of protrusions 231 integrated therewith, and the protrusions 231 are arranged 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 folded elastic skeletons 232, and the two ends of the folded elastic skeletons 232 are connected with 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, increase the extrusion force of the workpiece vibration on the capsule 230, amplify the volume change of the capsule 230 and the displacement of the abutting plate 240, and improve the capture sensitivity of the sensor to slight vibration. The folded elastic skeletons 232 expand and unfold with the capsule 230 when the capsule 230 is inflated, maintain the overall shape of the capsule 230, and avoid vibration transmission distortion caused by excessive deformation of the capsule 230.

[0025] In an embodiment, the top of the capsule 230 and the hollow air ring 210 are respectively connected with a connecting block 233 and an internal threaded seat 234. The internal threads of the internal threaded seat 234 pass through an adjusting stud 235. The surface of the adjusting stud 235 is threaded and sleeved with a locking nut. The side of the locking nut close to the internal threaded seat 234 is in close contact with the internal threaded seat 234.

[0026] Specifically, since the internal threaded seat 234 and the connecting block 233 are connected through the adjusting stud 235, the relative position of the capsule 230 and the hollow 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 adjustment, the adjusting stud 235 and the internal threaded seat 234 are fixed by tightening the locking nut, which prevents position deviation caused by machining vibration and ensures the stability of the detection structure and the accuracy of vibration transmission.

[0027] In an embodiment, the side of the adjusting stud 235 close to the connecting block 233 is rotationally connected with a pressing plate 236. The pressing plate 236 and the connecting block 233 are connected with a positioning spring 237 through a spring fixing piece.

[0028] Specifically, the positioning spring 237 can provide adaptive elastic compensation to ensure that the capsule 230 still closely fits when the workpiece vibrates or slightly displaces, avoiding interruption of vibration transmission caused by gaps.

[0029] In an embodiment, the inside of the air inlet pipe 400 is bolted with a plugging seat 410. The inside of the plugging seat 410 is in close contact with a plugging block 420. The other side of the plugging block 420 is provided with a fixing seat 430. The fixing seat 430 and the air inlet pipe 400 form an air inlet channel. The plugging block 420 and the fixing seat 430 are connected with a pressing spring 440 through a spring fixing piece.

[0030] Specifically, by cooperating the blocking seat 410 inside the air inlet pipe 400 with the blocking block 420, when not inflated, the blocking block 420 is pushed to tightly contact the blocking seat 410 to prevent the capsule 230 from leaking, and when inflated, the airflow pressure pushes the blocking block 420 to compress the pressing spring 440, so that the blocking block 420 is separated from the blocking seat 410, and the airflow enters the capsule 230 through the air inlet channel formed by the fixing seat 430 and the air inlet pipe 400, after stopping inflation, the pressing spring 440 resets to push the blocking block 420 to reseal, maintaining the stable air pressure in the capsule 230, the automatic sealing structure of the air inlet pipe 400 ensures the constant air pressure in the capsule 230, avoiding the air pressure fluctuation to interfere with the vibration detection (such as the change of the contact force between the capsule 230 and the workpiece caused by air pressure leakage).

[0031] In one embodiment, the elastic rod 600 is connected between the support plate and the abutting plate 240, and the elastic rod 600 is arranged in an arc shape and distributed in a ring shape between the support plate and the abutting plate 240.

[0032] Specifically, the arc-shaped elastic rod 600 realizes the dual functions of buffering and resetting, which not only protects the pressure sensor 280 from impact, but also ensures that the detection structure quickly returns to the initial state after vibration, improving the continuity of detection.

[0033] In one embodiment, the movable rod 310 is rotatably connected inside the ring-shaped support 300, the top end of the movable rod 310 is rotatably connected with the extrusion block 320, the bottom end of the movable rod 310 is rotatably connected with the pushing rod 330, and the pushing rod 330 is slidably arranged inside the workpiece support 200.

[0034] Specifically, the movable rod 310 inside the ring-shaped support 300 rotates through the pin shaft, the pushing rod 330 is pushed when the workpiece is placed, the pushing rod 330 drives the movable rod 310 to rotate around the pin shaft, the extrusion block 320 at the top end of the movable rod 310 moves to the inside of the ring-shaped support 300, and the workpiece is clamped to fix the workpiece and prevent the workpiece from moving during machining.

[0035] In one embodiment, the surface of the pushing rod 330 is slidably sleeved with the fixed cylinder 340, the inside of the workpiece support 200 is connected with the distribution disc 350, and the inside of the distribution disc 350 is annularly welded with a plurality of guide frames 360, the adjacent guide frames 360 form a distribution channel, and the fixed cylinder 340 communicates with the distribution channel.

[0036] Specifically, the fixed cylinder 340 on the surface of the push rod 330 is in communication with the distribution disc 350 inside the workpiece support 200, the guide frame 360 of the distribution disc 350 forms a distribution channel, and the external oil enters the fixed cylinder 340 through the distribution channel during processing. Under the action of oil pressure, the push plate 370 is pushed, and then the push rod 330 is moved, assisting the movable rod 310 to clamp the workpiece, and at the same time, the multiple extrusion blocks 320 are synchronously moved, realizing the effect of centering, clamping and fixing the workpiece. In order to reduce the influence of the fixing force of the extrusion block 320 on the contact pressure of the capsule 230 and balance the fixing stability and the accuracy of vibration result detection, the oil pressure of the distribution disc 350 is adjusted to accurately control the fixing force of the extrusion block 320 within the range of 800-1500N. This interval can not only ensure that the workpiece does not displace during high-speed cutting and multi-tool holder cooperative processing, but also reserve sufficient deformation space for the capsule 230, ensure the sensitivity of vibration transmission, and the extrusion block 320 is made of polyurethane elastic material, and the end surface in contact with the workpiece is arc-shaped, which increases the contact area and reduces local pressure concentration. At the same time, the rotation damping of the movable rod 310 is adjusted by the return spring 380, so that the fixing force is transmitted more uniformly, avoiding uneven contact pressure of the capsule 230 caused by excessive extrusion of a single point, and in the detection process, the positioning spring 237 inside the capsule 230 and the arc-shaped elastic rod 600 cooperate to compensate the contact pressure of the capsule 230 when the fixing force of the extrusion block 320 fluctuates slightly, so that the contact pressure is maintained in the best detection interval of 100-300kPa, avoiding the influence of fixing force fluctuation on 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 processing, only the signal change above the reference value is recognized, and the initial pressure interference caused by the fixing force is eliminated, ensuring the accuracy of vibration signal detection.

[0037] In one embodiment, the inside of the fixed cylinder 340 is slidably provided with a push plate 370, one side of the push plate 370 is connected with the push rod 330, the surface of the push rod 330 is sleeved with a return spring 380, and the two sides of the return spring 380 are connected with the push plate 370 and the inner wall of the fixed cylinder 340 through elastic fixing members.

[0038] Specifically, the return spring 380 realizes the automatic reset of the push rod 330, so that the extrusion block 320 and the movable rod 310 are reset, improving the operation convenience, and the push plate 370 can limit the movement track of the push rod 330 to prevent deviation and avoid the swing failure of the movable rod 310 caused by the inclination of the push rod 330.

[0039] In one embodiment, the inside of the annular support 300 is annularly provided with a gap, the movable rod 310 is rotatably connected to the inside of the gap through a pin shaft, and the two guide rods 500 are bolted to one side of the movable rod 310 close to the annular support 300, and the other ends of the guide rods 500 penetrate through the annular support 300 and are slidably connected thereto.

[0040] Specifically, the gap provides sufficient rotating space for the movable rod 310, ensuring that the movable rod 310 can swing with the pushing of the pushing rod 330, and the arrangement of the guide rods 500 ensures that the movable rod 310 can move in a certain direction, ensuring the fixing effect of the movable rod 310 on the workpiece.

[0041] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0042] The above-described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the protection scope of the present application should be subject to 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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