Flexible worktable of double-spindle machining center

Abstract

The application relates to a flexible workbench of a double-spindle machining center, and belongs to the technical field of machining equipment. The flexible workbench of the double-spindle machining center comprises a base, a rack arranged on the base, and a machining module arranged on the top of the rack. A workbench module is arranged below the machining module and is fixedly connected with the base. The workbench module comprises a fixed table, two mutually-parallel swing driving shafts are arranged above the fixed table in parallel, and one five-axis rotary table is arranged on each swing driving shaft. An adaptive fixing assembly is arranged above the five-axis rotary table. The adaptive fixing assembly comprises a middle rod body, a first platform and a second platform. The middle rod body is provided with a sliding cavity at one end, the sliding cavity penetrates through the two sides of the middle rod body, the first platform and the second platform are respectively inserted into the two ends of the sliding cavity and are in sliding fit with the inner wall of the sliding cavity. The application has the technical effect that the support mode can be adaptively adjusted, and an irregular workpiece with a protruding structure at the bottom can be horizontally and stably placed.

Description

Technical Field

[0001] This application relates to the technical field of machining equipment, and in particular to a flexible worktable for a dual-spindle machining center. Background Technology

[0002] Currently, twin-spindle machining centers are core, high-efficiency equipment in the field of precision machining. They can significantly shorten the machining cycle of parts through parallel processing at two stations, and are widely used in machining scenarios such as automotive parts, precision molds, and aerospace structural components. The worktable, as the basic component for workpiece clamping and support, directly determines the workpiece clamping accuracy and the workpiece compatibility range of the equipment based on its structural performance.

[0003] Patent (CN 106624837 A) discloses that the aforementioned patent includes a worktable body, a bridge, a tailstock, a C-axis rotation mechanism, and a B-axis swing mechanism. The worktable body is rotatably mounted on the bridge via the C-axis rotation mechanism. One end of the bridge is rotatably connected to the tailstock, and the B-axis swing mechanism is rotatably connected to the other end of the bridge. The C-axis of the C-axis rotation mechanism and the B-axis of the B-axis swing mechanism are perpendicular to each other. This invention's five-axis high-efficiency vertical machining center, employing a rotary swing worktable, not only boasts high precision and rigidity and good stability but also features a compact structure, simple operation, and long service life.

[0004] Regarding the aforementioned technologies, the inventors believe that they suffer from drawbacks such as the inability to adaptively adjust the support shape, difficulty in horizontally and stably placing irregular workpieces with protruding structures at the bottom, and insufficient flexibility of the worktable. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a flexible worktable for a dual-spindle machining center.

[0006] This application provides a flexible worktable for a dual-spindle machining center, which adopts the following technical solution: A flexible worktable for a dual-spindle machining center includes a base, a frame mounted on the base, and a machining module mounted on top of the frame. A worktable module is located below the machining module and is fixedly connected to the base. The worktable module includes a fixed platform, and two parallel swing drive axes are arranged side-by-side above the fixed platform. Each swing drive axis is equipped with a five-axis rotary table. An adaptive fixing assembly is located above the five-axis rotary table. The adaptive fixing assembly includes a central rod, a first platform, and a second platform. A sliding cavity is provided at one end of the central rod, extending through both sides of the central rod. The first platform and the second platform are respectively inserted into the two ends of the sliding cavity and slide in cooperation with the inner wall of the sliding cavity.

[0007] By adopting the above technical solution, the adaptive fixing component can achieve adaptive adjustment through the first platform and the second platform that can slide along the sliding cavity. It can automatically adjust the support range and support point according to the structural shape of the bottom of the workpiece, actively avoid the protrusions at the bottom of the workpiece, and make the workpiece with the protruding structure at the bottom stable and horizontally placed. It effectively solves the problem that traditional fixed worktables are difficult to adapt to workpieces with irregular bottoms, and greatly improves the flexibility of the worktable and the scope of workpiece applicability.

[0008] Preferably, a first cylinder and a second cylinder are fixedly disposed inside the sliding cavity, and a first push rod and a second push rod are respectively disposed inside the first cylinder and the second cylinder. The first push rod slides in conjunction with the inner wall of the first cylinder, and the second push rod slides in conjunction with the inner wall of the second cylinder.

[0009] By adopting the above technical solution, a pneumatic push rod structure is used to provide sliding driving force for the platform. It can utilize the properties of gas to adaptively and stably support the workpiece according to the bottom shape of the irregular workpiece.

[0010] Preferably, an airbag is provided above the first platform and the second platform, and the airbag has a first air outlet and a second air outlet; the first air outlet is connected to the first cylinder body through a hose, and the second air outlet is connected to the second cylinder body through a hose; the outer end of the first push rod abuts against the side of the first platform, and the outer end of the second push rod abuts against the side of the second platform; a switch valve is provided at both the first air outlet and the second air outlet.

[0011] By adopting the above technical solution, the workpiece's own weight is used as the power source to compress the airbag and generate air pressure driving force, thereby realizing adaptive dynamic adjustment of the support position. It can adapt to different irregular workpieces, with a high degree of adaptability and adjustment accuracy that closely matches the actual shape of the workpiece. The switch valves set at the first and second air outlets can control the on / off state of the corresponding air circuits. Under normal conditions, the switch valves are closed to keep the airbag inside sealed. When the switch valves are opened, the adaptive adjustment process can be triggered, which facilitates flexible start and stop adjustment according to working conditions, improving the flexibility of equipment use and operational reliability.

[0012] Preferably, the airbag further has a first exhaust port and a second exhaust port; the first exhaust port and the second exhaust port are connected to the sliding cavity; the port of the first exhaust port faces the upper surface of the first platform, and the upper surface of the first platform blocks the first exhaust port; the port of the second exhaust port faces the upper surface of the second platform, and the upper surface of the second platform blocks the port of the second exhaust port; when the first platform or the second platform reaches a predetermined position, the blocking of the corresponding first exhaust port and second exhaust port becomes ineffective.

[0013] By adopting the above technical solution, the first exhaust port and the second exhaust port adopt a structure in which the upper surface of the platform is sealed. The exhaust can be automatically opened as the platform slides, which simplifies the overall structure. The gas flowing out during the exhaust process can help push the platform to continue to slide outward, effectively extending the adjustment stroke of the platform, and realizing the linkage between the sliding action and the exhaust action.

[0014] Preferably, the sliding cavity is provided with a hinge rod and a baffle. The baffle is fixedly connected to the middle of the sliding cavity and divides the sliding cavity into two chambers. The hinge rod passes through the baffle and is fixedly connected to the baffle. The first platform and the second platform are hollow cavities. The two ends of the hinge rod pass through the hollow cavities of the first platform and the second platform, respectively, and the hinge rod is slidably connected to the first platform and the second platform.

[0015] By adopting the above technical solution, the baffle divides the sliding cavity into two independent cavities, which can avoid mutual interference of gas flow on both sides, ensure that the first platform and the second platform can operate independently without affecting each other, and improve the independence and accuracy of the adjustment on both sides; the hinge rod can provide support and guidance for the sliding of the platform, ensuring the stability of the platform sliding.

[0016] Preferably, the two ends of the hinge rod are respectively hinged to a first drop rod and a second drop rod; the free ends of the first drop rod and the second drop rod are each fixedly provided with a stop block; the two sets of stop blocks are respectively slidably disposed in the hollow cavities of the first platform and the second platform; the hinge points of the two ends of the hinge rod with the first drop rod and the second drop rod are all located on the outside of the five-axis rotary table.

[0017] By adopting the above technical solution, after the platform extends to the predetermined position, it can be suspended downwards by the hinge rotation of the drop bar, avoiding the protruding structure at the bottom of the workpiece and ensuring that the workpiece remains in a horizontal position, greatly improving the adaptability to workpieces with irregular bottoms; the stop block can limit the relative displacement between the platform and the drop bar, preventing the platform from falling off, ensuring the structural stability and support reliability of the platform in the suspended state, and expanding the workpiece applicability range of the worktable; the hinge point is located on the outside of the five-axis rotary table, which can avoid the five-axis rotary table below, allowing the first platform and the second platform to achieve 90° rotation and avoid collision.

[0018] Preferably, the lower inner wall of the sliding cavity is provided with a guide groove, and the lower surfaces of the first platform and the second platform are respectively provided with guide protrusions. The guide protrusions are embedded in the guide groove and slide in cooperation with the inner wall of the guide groove.

[0019] By adopting the above technical solution, the fitting and cooperation of the guide convex strip and the guide groove can provide precise linear guidance for the sliding of the first platform and the second platform, effectively avoiding the phenomenon of deflection and jamming during the sliding process of the platform, and improving the stability and positional accuracy of the platform movement.

[0020] Preferably, the base has multiple positioning holes, and the bottom of the fixing platform is fixedly provided with multiple positioning pins. The multiple positioning holes correspond one-to-one with the multiple positioning pins. The positioning pins are inserted into the positioning holes and slide in cooperation with the inner wall of the positioning holes. Locking holes are respectively provided on one side of the two outer sets of positioning holes, and fixing holes are provided on the two outer sets of positioning pins. The fixing holes correspond to the locking holes. The fixing holes are connected to the locking holes by locking screws.

[0021] By adopting the above technical solution, the insertion and engagement of the positioning pin and the positioning hole can realize the rapid positioning and assembly of the fixed table; the connection method of the locking screw through locking is reliable in structure and convenient in disassembly and assembly, which not only ensures the connection strength between the workbench module and the base, but also facilitates the later maintenance, replacement and position adjustment of the workbench module.

[0022] Preferably, the processing module includes a first spindle and a second spindle, as well as two sets of mounting brackets; the two sets of mounting brackets are disposed on the top of the frame, and the two sets of mounting brackets are slidably engaged along the length of the frame; the first spindle and the second spindle are respectively slidably disposed on the two sets of mounting brackets.

[0023] By adopting the above technical solutions, the dual-spindle configuration can realize synchronous processing at two workstations or parallel processing of multiple processes, thereby improving processing efficiency; the two sets of mounting brackets can drive the machine body to slide along the frame, and the spindle can adjust its position along the mounting bracket, which can flexibly adjust the processing point to adapt to workpieces of different sizes and processing requirements, thereby improving the processing range and flexibility of the processing module.

[0024] Preferably, the swing axes of the two swing drive shafts are parallel to each other, the rotation axes of the two five-axis rotary tables are parallel to each other, and the rotation axis of each five-axis rotary table is perpendicular to the swing axis of the corresponding swing drive shaft.

[0025] By adopting the above technical solution, the two swing drive axes and the two five-axis rotary tables are arranged with parallel axes, which ensures the consistency of the movement of the two stations and enables synchronous linkage processing of the two stations. The setting of the rotary axis and the swing axis perpendicular to each other enables the workpiece to adjust its posture in multiple dimensions and angles, meets the process requirements of complex curved surfaces and multi-faceted processing, and improves processing accuracy and processing flexibility.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The adaptive fixing component achieves adaptive adjustment through the first platform and the second platform that can slide along the sliding cavity. It can automatically adjust the support range and support point according to the structural shape of the bottom of the workpiece, actively avoid the protrusions on the bottom of the workpiece, and make the workpiece with the protruding structure on the bottom stable and horizontally placed. It effectively solves the problem that traditional fixed worktables are difficult to adapt to workpieces with irregular bottoms, and greatly improves the flexibility of the worktable and the scope of workpiece applicability.

[0027] 2. The airbag is compressed by the workpiece's own weight to generate air pressure driving force, realizing adaptive dynamic adjustment of the support position. It can adapt to different irregular workpieces, with a high degree of adaptability and adjustment accuracy that closely matches the actual shape of the workpiece. The switch valves set at the first and second air outlets can control the on / off state of the corresponding air circuits. Under normal conditions, the switch valves are closed to keep the inside of the airbag sealed. When the switch valves are opened, the adaptive adjustment process is triggered, which facilitates flexible start and stop adjustment according to working conditions, improving the flexibility of equipment use and operational reliability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure in the embodiment.

[0029] Figure 2 This is a schematic diagram of the workbench module in the embodiment.

[0030] Figure 3 This is a schematic diagram of the adaptive fastener in the embodiment.

[0031] Figure 4 yes Figure 3 Enlarged view of one side of the structure of the first platform.

[0032] Figure 5 This is a schematic diagram of the fixed platform clamping structure in the embodiment.

[0033] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Base; 12. Positioning hole; 13. Locking hole; 14. Locking screw; 15. Fixing hole; 2. Worktable module; 21. Fixing table; 22. Swing drive shaft; 23. Five-axis rotary table; 24. Adaptive fixing component; 241. Intermediate rod; 242. First platform; 2422. Guide ridge; 243. Second platform; 244. Airbag; 2441. First air outlet; 2442. Second air outlet; 2443. ... 1. Cylinder block; 2444. Second cylinder block; 2445. First push rod; 2446. Second push rod; 2447. Hoose; 2448. Switch valve; 2449. First exhaust port; 2440. Second exhaust port; 245. Hinge rod; 246. Sliding cavity; 2461. Guide groove; 247. First drop rod; 248. Second drop rod; 249. Stop block; 25. Positioning pin; 26. Baffle; 3. Machining module; 31. First spindle; 32. Second spindle. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0035] This application discloses a flexible worktable for a dual-spindle machining center. (Refer to...) Figures 1 to 3The system includes a base 11, on which a frame 1 is mounted, and a processing module 3 is mounted on top of the frame 1. A workbench module 2 is mounted below the processing module 3 and is fixedly connected to the base 11. The workbench module 2 includes a fixed platform 21, above which two parallel swing drive shafts 22 are arranged side-by-side. Each swing drive shaft 22 has a five-axis rotary table 23 mounted on it. The swing axes of the two swing drive shafts 22 are parallel to each other, and the rotation axes of the two five-axis rotary tables 23 are parallel to each other, with each five-axis rotary table 23's rotation axis perpendicular to the swing axis of its corresponding swing drive shaft 22. An adaptive fixing assembly is mounted above the five-axis rotary tables 23. The adaptive fixing assembly includes a central rod 241, a first platform 242, and a second platform 243. One end of the central rod 241 has a sliding cavity 246. Through the two sides of the intermediate rod 241, the first platform 242 and the second platform 243 are respectively inserted into the two ends of the sliding cavity 246 and slide in cooperation with the inner wall of the sliding cavity 246. When two swing drive shafts 22 are needed to support a part, and the part has a protruding structure at the bottom, the adaptive fixing assembly is activated. The five-axis rotary table 23 on the swing drive shaft 22 rotates so that the movement direction of the first platform 242 and the second platform 243 in the adaptive fixing assembly is perpendicular to the swing axis of the swing drive shaft 22. When the adaptive fixing assemblies on the two sets of swing drive shafts 22 are parallel to each other, after the adaptive fixing assembly is activated, the part is placed on the adaptive fixing assembly. The adaptive fixing assembly pushes the first platform 242 and the second platform 243 to slide down according to the gravity distribution of the part itself and a series of linkage operations, so as to achieve the purpose of placing the part with the protruding structure at the bottom horizontally on the platform.

[0036] Reference Figures 3 to 4 A first cylinder 2443 and a second cylinder 2444 are fixedly disposed inside the sliding cavity 246. A first push rod 2445 and a second push rod 2446 are respectively disposed inside the first cylinder 2443 and the second cylinder 2444. The first push rod 2445 is slidably engaged with the inner wall of the first cylinder 2443, and the second push rod 2446 is slidably engaged with the inner wall of the second cylinder 2444. When compressed gas is introduced into the rodless cavity of the first cylinder 2443, the first push rod 2445 slides outward along the inner wall of the first cylinder 2443. When compressed gas is introduced into the rodless cavity of the second cylinder 2444, the second push rod 2446 slides outward along the inner wall of the second cylinder 2444.

[0037] Reference Figures 3 to 4An airbag 244 is disposed above the first platform 242 and the second platform 243. The airbag 244 has a first air outlet 2441 and a second air outlet 2442. The first air outlet 2441 is connected to the first cylinder 2443 via a hose 2447, and the second air outlet 2442 is connected to the second cylinder 2444 via a hose 2447. The outer end of the first push rod 2445 abuts against the side of the first platform 242, and the outer end of the second push rod 2446 abuts against the side of the second platform 243. The first air outlet 2441 and the second air outlet... A switching valve 2448 is installed at each of the following locations: Under normal conditions, the switching valves 2448 at the first air outlet 2441 and the second air outlet 2442 are both closed, and the airbag 244 remains sealed. After manually opening the switching valves 2448 at the first air outlet 2441 and the second air outlet 2442, the gas inside the airbag 244 can flow into the first cylinder 2443 through the first air outlet 2441 and the hose 2447, and into the second cylinder 2444 through the second air outlet 2442 and the hose 2447. When an irregular workpiece is placed on the upper surface of the airbag 244, the pressure on both sides of the airbag 244 varies due to the shape of the workpiece. The airbag 244 cavity on the side with greater pressure is compressed, and the internal gas flows to the corresponding first air outlet 2441 or second air outlet 2442, and enters the corresponding first cylinder 2443 or second cylinder 2444 through the hose 2447. When the first push rod 2445 slides outward under the pressure of the gas in the first cylinder 2443, the outer end face of the first push rod 2445 pushes the side of the first platform 242, causing the first platform 242 to slide outward along the sliding cavity 246. When the second push rod 2446 slides outward under the pressure of the gas in the second cylinder 2444, the outer end face of the second push rod 2446 pushes the side of the second platform 243, causing the second platform 243 to slide outward along the sliding cavity 246.

[0038] Reference Figures 3 to 4The airbag 244 also has a first exhaust port 2449 and a second exhaust port 2440; the first exhaust port 2449 and the second exhaust port 2440 are connected to the sliding cavity 246; the port of the first exhaust port 2449 faces the upper surface of the first platform 242, and the upper surface of the first platform 242 blocks the first exhaust port 2449; the port of the second exhaust port 2440 faces the upper surface of the second platform 243, and the upper surface of the second platform 243 blocks the port of the second exhaust port 2440. When the first platform 242 or the second platform 243 reaches a predetermined position, the corresponding first exhaust port 244... 9. The sealing of the second exhaust port 2440 fails; when the first platform 242 is in the initial retracted position, the upper surface of the first platform 242 covers the port of the first exhaust port 2449, forming a seal on the first exhaust port 2449; as the first platform 242 slides outward along the sliding cavity 246, the upper surface of the first platform 242 gradually shifts away from the port of the first exhaust port 2449, the sealing effect of the first exhaust port 2449 gradually disappears, the gas inside the airbag 244 flows to the sliding cavity 246 through the first exhaust port 2449, and continues to push the first platform 242 outward, and finally discharges to the outside. When the second platform 243 is in the initial retracted position, the upper surface of the second platform 243 covers the port of the second exhaust port 2440, thus blocking the second exhaust port 2440. As the second platform 243 slides outward along the sliding cavity 246, the upper surface of the second platform 243 gradually shifts away from the port of the second exhaust port 2440, and the blocking effect of the second exhaust port 2440 gradually disappears. The gas inside the airbag 244 flows through the second exhaust port 2440 to the sliding cavity 246, and pushes the second platform 243 to slide outward, eventually being discharged to the outside.

[0039] Reference Figures 3 to 4The sliding cavity 246 is equipped with a hinge rod 245 and a baffle 26. The baffle 26 is fixedly connected to the middle of the sliding cavity 246, dividing the sliding cavity 246 into two chambers. The hinge rod 245 passes through the baffle 26 and is fixedly connected to the baffle 26. The first platform 242 and the second platform 243 are hollow cavities. The two ends of the hinge rod 245 pass through the hollow cavities of the first platform 242 and the second platform 243 respectively, and are slidably connected to the first platform 242 and the second platform 243. The baffle 26 is always fixed in the middle of the sliding cavity 246. The position is not displaced by the movement of other components. When the gas in the airbag 244 flows to the sliding cavity 246 through the first exhaust port 2449 or the second exhaust port 2440, it prevents the gas from spreading to both sides and causing the second platform 243 or the first platform 242 to slide outward simultaneously. When the first platform 242 slides outward along the sliding cavity 246, the hollow cavity of the first platform 242 slides outward relative to the other along the body of the hinge rod 245. When the second platform 243 slides outward along the sliding cavity 246, the hollow cavity of the second platform 243 slides outward relative to the other along the body of the hinge rod 245.

[0040] Reference Figures 3 to 4The hinge rod 245 has a first drop rod 247 and a second drop rod 248 hinged to its two ends respectively; both the free ends of the first drop rod 247 and the second drop rod 248 are fixedly provided with stop blocks 249; the two sets of stop blocks 249 are slidably disposed in the hollow cavities of the first platform 242 and the second platform 243 respectively; the hinge points of both ends of the hinge rod 245 with the first drop rod 247 and the second drop rod 248 are located on the outside of the five-axis rotary table 23; during the sliding of the first platform 242 outward along the hinge rod 245, the stop blocks 249 at the ends of the first drop rod 247 and the second drop rod 248 are relative to the first drop rod 247 and the second drop rod 248. The hollow cavity of the first platform 242 slides inward; when the inner end face of the first platform 242 slides past the hinge point between the first falling rod 247 and the hinge rod 245, the first platform 242 loses support and falls downward under its own weight, while simultaneously causing the first falling rod 247 to rotate downward around the hinge point; during the rotation of the first falling rod 247, the stop block 249 slides along the inner wall of the hollow cavity of the first platform 242 and finally abuts against the inner wall of the hollow cavity of the first platform 242, restricting the first platform 242 from relatively separating from the first falling rod 247, so that the first platform 242 remains suspended. As the second platform 243 slides outward along the hinge rod 245, the second drop rod 248 and the stop block 249 at the end of the second drop rod 248 slide inward relative to the hollow cavity of the second platform 243. When the inner end face of the second platform 243 slides past the hinge point between the second drop rod 248 and the hinge rod 245, the second platform 243 loses its bottom support and falls downward under its own weight, while simultaneously causing the second drop rod 248 to rotate downward around the hinge point. During the rotation of the second drop rod 248, the stop block 249 slides along the inner wall of the hollow cavity of the second platform 243 and finally abuts against the inner wall of the hollow cavity of the second platform 243, preventing the second platform 243 from separating from the second drop rod 248 and keeping the second platform 243 in a suspended state.

[0041] Reference Figures 3 to 4 The lower inner wall of the sliding cavity 246 is provided with a guide groove 2461. The lower surfaces of the first platform 242 and the second platform 243 are respectively provided with guide protrusions 2422. The guide protrusions 2422 are embedded in the guide groove 2461 and slide in cooperation with the inner wall of the guide groove 2461. When the first platform 242 slides along the sliding cavity 246, the guide protrusions 2422 on the lower surface of the first platform 242 slide synchronously along the inner wall of the guide groove 2461 and complete the guide movement along the extension direction of the guide groove 2461. When the second platform 243 slides along the sliding cavity 246, the guide protrusions 2422 on the lower surface of the second platform 243 slide synchronously along the inner wall of the guide groove 2461 and complete the guide movement along the extension direction of the guide groove 2461.

[0042] Reference Figures 1 to 2Preferably, the base 11 has multiple positioning holes 12, and the bottom of the fixing platform 21 is fixedly provided with multiple positioning pins 25. Each positioning hole 12 corresponds to one positioning pin 25, and the positioning pins 25 are inserted into the positioning holes 12 and slide against the inner wall of the positioning holes 12. Locking holes 13 are respectively provided on one side of the two outer sets of positioning holes 12, and fixing holes 15 are provided on the two outer sets of positioning pins. The fixing holes 15 correspond to the locking holes 13. The fixing holes 15 are connected to the locking holes 13 by locking screws 14. The locking hole 13 is connected; when assembling the fixed platform 21, the positioning pin 25 at the bottom of the fixed platform 21 is aligned with the positioning hole 12 on the base 11 and inserted. The positioning pin 25 slides down along the inner wall of the positioning hole 12 to the assembly end position; then the locking screw 14 is inserted into the locking hole 13 and rotated, so that the locking screw 14 is fed along the thread of the locking hole 13 toward the positioning pin 25 until the locking screw 14 passes through at least two sets of corresponding positioning holes 12 and positioning pins 25, thus completing the locking of the fixed platform 21.

[0043] Reference Figure 1 The processing module 3 includes a first spindle 31 and a second spindle 32, as well as two sets of mounting brackets. The two sets of mounting brackets are located on the top of the frame 1 and slide together along the length of the frame 1. The first spindle 31 and the second spindle 32 are respectively slidably mounted on the two sets of mounting brackets. The two sets of mounting brackets can slide back and forth along the length of the frame 1, thereby driving the first spindle 31 and the second spindle 32 to move synchronously along the length of the frame 1. The first spindle 31 and the second spindle 32 can slide back and forth along the guide direction of the corresponding mounting brackets to adjust their processing positions.

[0044] The working principle of the flexible worktable of the dual-spindle machining center in this application is as follows: When the work requires two swing drive shafts 22 to support a workpiece with a protruding bottom structure; before machining, first, align the positioning pin 25 at the bottom of the fixed table 21 with the positioning hole 12 on the base 11 and insert it. The positioning pin 25 slides down along the inner wall of the positioning hole 12 to the assembly end position. Then, insert the locking screw 14 into the locking hole 13 and rotate it until the locking screw 14 penetrates at least two sets of corresponding positioning holes 12 and positioning pins 25, completing the locking assembly of the fixed table 21 and the base 11; the five-axis return on the swing drive shaft 22... The turntable 23 rotates so that the first platform 242 and the second platform 243 in the adaptive fixing assembly move in a direction perpendicular to the swing axis of the swing drive shaft 22, and the adaptive fixing assemblies on the two sets of swing drive shafts 22 are parallel to each other. Then, the switching valves 2448 at the first air outlet 2441 and the second air outlet 2442 are opened, and the irregular workpiece is placed on the upper surface of the airbag 244. Due to the influence of the workpiece's gravity distribution, there is a pressure difference on both sides of the airbag 244. When the pressure on the first platform 242 is greater, the internal gas flows into the second cylinder 2 through the second air outlet 2442 and the hose 2447. 444, pushing the second push rod 2446 to slide outward along the inner wall of the second cylinder 2444, causing the second platform 243 to slide outward. The guide rib 2422 guides along the guide groove 2461. When the second platform 243 reaches the position of sliding past the second exhaust port 2440, the blockage of the second exhaust port 2440 fails, and the gas inside the airbag 244 flows into the sliding cavity 246 through the second exhaust port 2440 and pushes the second platform 243 to continue sliding outward due to the action of the baffle 26. When the inner end face of the second platform 243 passes the hinge point between the second drop rod 248 and the hinge rod 245, the second platform 243... 43 loses support and falls under its own weight, causing the second falling rod 248 to rotate downward around the hinge point. The stop block 249 finally abuts against the inner wall of the hollow cavity of the second platform 243, keeping the second platform 243 in a suspended state, thus enabling the parts with protruding structures at the bottom to be placed horizontally. The process and result are the same if the pressure above the second platform 243 is large. The two sets of mounting brackets of the processing module 3 drive the first spindle 31 and the second spindle 32 to slide along the length of the frame 1. The first spindle 31 and the second spindle 32 adjust their positions along the corresponding mounting brackets, and cooperate with the five-axis rotary table 23 and the swing drive shaft 22 to complete the processing.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flexible worktable for a dual-spindle machining center, characterized in that: The system includes a base (11), on which a frame (1) is mounted. A processing module (3) is mounted on the top of the frame (1). A workbench module (2) is mounted below the processing module (3) and is fixedly connected to the base (11). The workbench module (2) includes a fixed platform (21), above which two parallel swing drive shafts (22) are mounted side by side. Each swing drive shaft (22) is mounted with a five-axis rotary table (23). An adaptive fixing assembly is provided above the five-axis rotary table (23); the adaptive fixing assembly includes an intermediate rod (241), a first platform (242) and a second platform (243); a sliding cavity (246) is provided at one end of the intermediate rod (241), the sliding cavity (246) passes through both sides of the intermediate rod (241), the first platform (242) and the second platform (243) are respectively inserted into the two ends of the sliding cavity (246) and slide in cooperation with the inner wall of the sliding cavity (246).

2. The flexible worktable for a dual-spindle machining center according to claim 1, characterized in that: A first cylinder (2443) and a second cylinder (2444) are fixedly disposed inside the sliding cavity (246). A first push rod (2445) and a second push rod (2446) are respectively disposed inside the first cylinder (2443) and the second cylinder (2444). The first push rod (2445) slides with the inner wall of the first cylinder (2443), and the second push rod (2446) slides with the inner wall of the second cylinder (2444).

3. The flexible worktable for a dual-spindle machining center according to claim 2, characterized in that: An airbag (244) is provided above the first platform (242) and the second platform (243). The airbag (244) has a first air outlet (2441) and a second air outlet (2442). The first air outlet (2441) is connected to the first cylinder (2443) through a hose (2447), and the second air outlet (2442) is connected to the second cylinder (2444) through a hose (2447). The outer end of the first push rod (2445) abuts against the side of the first platform (242), and the outer end of the second push rod (2446) abuts against the side of the second platform (243). A switch valve (2448) is provided at both the first air outlet (2441) and the second air outlet (2442).

4. The flexible worktable of a dual-spindle machining center according to claim 3, characterized in that: The airbag (244) is also provided with a first exhaust port (2449) and a second exhaust port (2440); the first exhaust port (2449) and the second exhaust port (2440) are connected to the sliding cavity (246); the port of the first exhaust port (2449) faces the upper surface of the first platform (242), and the upper surface of the first platform (242) blocks the first exhaust port (2449); the port of the second exhaust port (2440) faces the upper surface of the second platform (243), and the upper surface of the second platform (243) blocks the port of the second exhaust port (2440). When the first platform (242) or the second platform (243) reaches the predetermined position, the blocking of the corresponding first exhaust port (2449) and second exhaust port (2440) fails.

5. The flexible worktable of a dual-spindle machining center according to claim 1, characterized in that: The sliding cavity (246) is provided with a hinge rod (245) and a baffle (26). The baffle (26) is fixedly connected to the middle part of the sliding cavity (246) and divides the sliding cavity (246) into two cavities. The hinge rod (245) passes through the baffle (26) and is fixedly connected to the baffle (26). The first platform (242) and the second platform (243) are hollow cavities. The two ends of the hinge rod (245) are respectively inserted into the hollow cavities of the first platform (242) and the second platform (243). The hinge rod (245) is slidably connected to the first platform (242) and the second platform (243).

6. The flexible worktable of a dual-spindle machining center according to claim 5, characterized in that: The two ends of the hinge rod (245) are respectively hinged to a first falling rod (247) and a second falling rod (248); the free ends of the first falling rod (247) and the second falling rod (248) are fixedly provided with stop blocks (249); the two sets of stop blocks (249) are respectively slidably disposed in the hollow cavities of the first platform (242) and the second platform (243); the hinge points of the two ends of the hinge rod (245) with the first falling rod (247) and the second falling rod (248) are all located on the outside of the five-axis rotary table (23).

7. The flexible worktable for a dual-spindle machining center according to claim 1, characterized in that: The lower inner wall of the sliding cavity (246) is provided with a guide groove (2461), and the lower surfaces of the first platform (242) and the second platform (243) are respectively provided with guide protrusions (2422). The guide protrusions (2422) are embedded in the guide groove (2461) and slide in cooperation with the inner wall of the guide groove (2461).

8. The flexible worktable of a dual-spindle machining center according to claim 1, characterized in that: The base (11) has multiple positioning holes (12), and the bottom of the fixed platform (21) is fixedly provided with multiple positioning pins (25). The multiple positioning holes (12) correspond one-to-one with the multiple positioning pins (25). The positioning pins (25) are inserted into the positioning holes (12) and slide in cooperation with the inner wall of the positioning holes (12). Locking holes (13) are respectively provided on one side of the two sets of positioning holes (12) on the outer side. Fixing holes (15) are provided on the two sets of positioning pins on the outer side. The fixing holes (15) correspond to the locking holes (13) in position. The fixing holes (15) are connected to the locking holes (13) through the locking screws (14).

9. A flexible worktable for a dual-spindle machining center according to claim 1, characterized in that: The processing module (3) includes a first spindle (31) and a second spindle (32) as well as two sets of mounting brackets; the two sets of mounting brackets are disposed on the top of the frame (1) and the two sets of mounting brackets slide together along the length of the frame (1); the first spindle (31) and the second spindle (32) are respectively slidably disposed on the two sets of mounting brackets.

10. A flexible worktable for a dual-spindle machining center according to claim 1, characterized in that: The swing axes of the two swing drive shafts (22) are parallel to each other, the rotation axes of the two five-axis rotary tables (23) are parallel to each other, and the rotation axis of each five-axis rotary table (23) is perpendicular to the swing axis of the corresponding swing drive shaft (22).

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