A double-sided synchronous gapless drive overhead crane type five-axis machining machine tool

Abstract

The application discloses a double-side synchronous no-gap driving crane type five-axis machining tool, which comprises a rack and cutting devices and a tool magazine device arranged on the rack; the cutting devices comprise a three-axis transmission module, a cutting module and a workbench; the tool magazine device comprises a tool storage mechanism and a tool changing mechanism; the tool storage mechanism is provided with a plurality of annular mounting seats which are concentrically arranged, have different outer diameters and are driven by independent driving modules; each annular arrangement structure is provided with an avoidance gap; the tool arm of the tool changing mechanism moves along a straight line and can pass through the avoidance gap to reach any layer target tool position; the rack is divided into front and rear warehouse bodies through a warehouse door assembly and respectively accommodates the workbench and the tool magazine device. The application realizes independent rotation of each layer tool disc and linear penetration of tool taking, greatly improves tool magazine capacity and tool changing efficiency, adapts to more cutting processes of tools, is combined with double-side synchronous no-gap driving, is suitable for continuous machining of multiple tools for complex parts and significantly improves machining precision, surface quality and overall machining effect of products.

Description

Technical Field

[0001] This invention relates to the field of CNC machining equipment technology, specifically to a dual-sided synchronous backlash-free drive overhead crane type five-axis machining center. Background Technology

[0002] With the increasing demands for precision molds and complex curved surface parts, modern CNC machining places higher requirements on the machining accuracy, efficiency, and automation of machine tools. Among the many factors affecting machining quality, the configuration of the tooling system and its tool changing capability directly determine the richness of the process options and the surface quality of the final product.

[0003] In existing machining centers, tool magazine devices generally suffer from limited capacity and complex tool changing paths. Traditional disc-type tool magazines can typically only hold twenty to forty tools; chain-type tool magazines, while expandable in capacity, occupy a large space and have significant cumulative transmission errors. For complex integral impellers, engine blocks, and other parts, a single clamping often requires completing multiple processes such as rough milling, semi-finish milling, finish milling, drilling, tapping, and chamfering, and the required types of tools often exceed the carrying capacity of traditional tool magazines.

[0004] Due to insufficient tool magazine capacity, operators have to break down machining tasks and complete them in multiple clamping operations. Each clamping operation corresponds to a limited set of tools, which not only increases the risk of accumulated clamping errors but also significantly prolongs auxiliary machining time, ultimately affecting the dimensional accuracy and surface consistency of the product.

[0005] On the other hand, the multi-layer disc structure in existing tool magazines usually shares the same drive shaft or requires a complex indexing mechanism. The rotation of any disc to select a tool will affect the position of other discs, and each layer cannot select a tool independently. Even if the tool magazine stores a variety of tools, the tool changing mechanism has difficulty in quickly picking up the specified tool position in any layer of the multi-layer structure, which seriously restricts the feasibility of continuous machining with multiple tools and multiple processes. At the same time, most existing tool changing mechanisms use robotic arms to pick up tools by arc swinging, which has a complex motion path and the problem of avoiding interference between multi-layer discs is particularly prominent.

[0006] The aforementioned defects mean that although the machine tool has five-axis linkage capability, it cannot fully utilize the advantages of multi-tool and multi-process continuous machining due to the limitations of the tool supply system, and the machining accuracy and surface quality of the final product are also limited as a result. Summary of the Invention

[0007] The purpose of this invention is to provide a dual-sided synchronous backlash-free drive overhead crane type five-axis machining center, which solves the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a dual-sided synchronous backlash-free drive overhead crane type five-axis machining center, wherein a cutting device and a tool magazine device are provided on the machine frame; The cutting device includes a three-axis transmission module, a cutting module, and a worktable. The cutting module is located at the movable end of the three-axis transmission module and is equipped with a cutting tool. The worktable is used to clamp the workpiece, and the cutting module and the worktable are arranged vertically. The tool magazine device includes a tool storage mechanism and a tool changing mechanism; The tool storage mechanism includes a fixed disk and several annular mounting seats rotatably connected to the lower end face of the fixed disk. The outer diameters of the several annular mounting seats are different from each other, and the several annular mounting seats are concentrically arranged. The diameter difference between adjacent annular mounting seats is a constant value. Each annular mounting seat is provided with an annular arrangement structure. The annular arrangement structure has at least one clearance notch. The annular arrangement structure includes several annularly arranged tool sleeves, which are used to install tools. Each of the aforementioned annular mounting bases is linked to a drive module; The tool changing mechanism includes a moving module and a lifting module located at the movable end of the moving module. The lifting module is equipped with a tool arm. The moving module drives the tool arm to perform linear transmission. The tool arm can pass through one or more annular arrangement structure clearance gaps. The frame is equipped with a door assembly, which is located between the tool storage mechanism and the tool changing mechanism. The frame is divided into two compartments by the door assembly, and the worktable and the tool magazine device are located in the front and rear compartments of the frame, respectively.

[0009] Preferably, the fixed plate is provided with a plurality of annular slide rails, and the plurality of annular slide rails correspond to the plurality of annular mounting seats respectively. Each annular mounting seat is slidably mounted on the corresponding annular slide rail by a slider.

[0010] Preferably, the drive module includes a drive motor, a reducer, and a transmission gear. The drive motor is linked to the reducer and is fixedly mounted on a fixed disk. The output end of the reducer is connected to the transmission gear. A rack is provided on the circumferential end face of the inner side of the annular mounting base, and the transmission gear meshes with the corresponding rack.

[0011] Preferably, the tool magazine device further includes a mounting platform, on which the tool storage mechanism and the tool changing mechanism are mounted. The mounting platform is provided with a connecting part, which is inverted "Y" shape. The bottom two ends of the connecting part are connected to the mounting platform and a clearance space is provided. The top of the connecting part is connected to the fixed plate. The moving module is laid on the mounting platform and passes through the clearance space.

[0012] Preferably, the annular mounting seat is provided with a plurality of mounting holes arranged circumferentially, the mounting holes are used for matching and assembling with tool holders, and at least one mounting hole on any annular mounting seat is not assembled with a tool holder, and the mounting holes without assembled tool holders form an avoiding notch in an annular arrangement structure.

[0013] Preferably, the frame includes a base and two support seats symmetrically arranged on the base, and the frame is in a "U" shape; The warehouse door assembly includes a door frame and two propulsion cylinders. Both ends of the door frame are connected to the two support seats. The door frame is provided with an opening. The two propulsion cylinders are respectively located on both sides of the opening and arranged symmetrically. The movable ends of the two propulsion cylinders are connected with door panels. The two door panels move toward the center and fit with each other to cover the opening. When the two door panels move toward both ends and move away from each other, the opening on the door frame is completely open; The cutting module is a mechanical spindle; The worktable is a cradle-type five-axis rotary table, and the three-axis module includes an X-axis transmission module, a Y-axis transmission module and a Z-axis transmission module which are assembled in a matching manner.

[0014] Preferably, there are two sets of the X-axis transmission modules, the two sets of X-axis transmission modules are respectively arranged on the two support seats, the movable ends of the two sets of X-axis transmission modules are connected with a Y-axis sliding seat, the Y-axis transmission module is arranged on the Y-axis sliding seat, the movable end of the Y-axis transmission module is connected with the Z-axis transmission module, and the movable end of the Z-axis transmission module is connected with the cutting module.

[0015] Preferably, the X-axis transmission module, the Y-axis transmission module and the Z-axis transmission module are all linear motors; the base and the two support seats are provided with a plurality of hollow structures.

[0016] Preferably, a chip removal mechanism is further arranged on the frame, and the chip removal mechanism is located directly below the worktable. The chip removal mechanism includes a chip removal groove opened on the frame and a chip remover located inside the chip removal groove. The chip removal mechanism includes a motor, the motor is linked and connected with the chip remover, and one end of the chip removal groove penetrates through the side end of the frame to form a chip removal port.

[0017] Preferably, the three-axis transmission module is provided with a plurality of bellows covers and a plurality of cover plates, and the plurality of bellows covers and the plurality of cover plates form a first protection assembly; Baffles are arranged on both sides of the worktable, and the two baffles form a second protection assembly; The first protection assembly and the second protection assembly form an inner layer protection structure; The machine further comprises a case, the frame is arranged in the case, and the case forms an outer layer protection structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a multi-layer tool magazine structure comprised of several concentrically arranged annular mounting seats with varying outer diameters. Each annular mounting seat is controlled to rotate by an independent drive module, and each annular arrangement has a pre-reserved clearance notch. Each layer of annular mounting seats can rotate independently to select tools without interference. Combined with the linear passing motion of the tool changing mechanism, the tool arm can pass through the clearance notch of the outer ring seat to reach the inner target ring seat and retrieve the designated tool. This structure significantly increases the tool magazine capacity, providing ample storage space for various types of tools required for multiple processes. By selecting the appropriate tool according to the product's cutting process, the machining accuracy, surface quality, and overall machining effect of the product are significantly improved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 This is a partial structural diagram of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the tool magazine device of the present invention; Figure 5 This is a side view of the tool magazine device of the present invention; Figure 6 For the present invention Figure 5 AA section diagram; Figure 7 For the present invention Figure 6 A magnified view of a section at point B in the middle; Figure 8 This is a partial structural diagram of the present invention. Figure 3 ; Figure 9 This is a partial structural diagram of the present invention. Figure 4 .

[0020] The reference numerals and names in the figure are as follows: 1-Frame; 11-Base; 12-Support; 13-Y-axis slide; 2-Cutting device; 21-X-axis transmission module; 22-Y-axis transmission module; 23-Z-axis transmission module; 24-Cutting module; 25-Worktable; 3-Tool magazine device; 31-Tool storage mechanism; 311-Fixed plate; 312-Annular mounting seat; 312a-Inner ring seat; 312b-Middle ring seat; 312c-Outer ring seat; 313-Annular arrangement structure; 314-Allowing notch; 315-Tool holder; 316-Drive module; 3161-Drive motor ; 3162-Reducer; 3163-Transmission gear; 317-Annular slide rail; 318-Slider; 319-Rack; 32-Tool changing mechanism; 321-Moving module; 322-Lifting module; 323-Tool arm; 33-Mounting platform; 331-Connecting part; 332-Allowing space; 4-Door assembly; 41-Door frame; 42-Propulsion cylinder; 43-Door panel; 44-Opening; 5-Chip removal mechanism; 51-Chip removal groove; 52-Chip conveyor; 53-Chip removal port; 61-First protection component; 62-Second protection component; 63-Chassis. Detailed Implementation

[0021] 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, and 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.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Please see Figures 1 to 9 The present invention provides an embodiment of a dual-sided synchronous backlash-free drive gantry-type five-axis machining center, comprising a frame 1, which is composed of a base 11 and two support seats 12 symmetrically arranged on the base 11, forming an overall "U" shape to form a gantry-type structural frame; multiple hollow structures are provided on the base 11 and the two support seats 12 to reduce the load on moving parts and improve thermal balance performance while ensuring structural rigidity.

[0024] The frame 1 is equipped with a cutting device 2 and a tool magazine device 3, and the frame 1 is also equipped with a door assembly 4. The frame 1 is divided into two compartments by the door assembly 4. The worktable 25 and the tool magazine device 3 are located in the front and rear compartments of the frame 1, respectively, so that the processing area and the tool magazine storage area are relatively independent in space.

[0025] The cutting device 2 includes a three-axis transmission module, a cutting module 24, and a worktable 25. The three-axis transmission module includes an X-axis transmission module 21, a Y-axis transmission module 22, and a Z-axis transmission module 23, which are assembled together. Two sets of X-axis transmission modules 21 are provided, each mounted on a support base 12. The movable ends of the two sets of X-axis transmission modules 21 are connected to Y-axis slides 13, which are essentially the crossbeams of a crane-type structure. The two sets of X-axis linear motors synchronously drive the crossbeams and Y-axis slides 13 to move along the X-direction. The Y-axis transmission module 22 is mounted on the Y-axis slides 13. Under the control system, the linear motors of the two X-axis transmission modules 21 receive completely synchronized drive commands and move synchronously. To achieve backlash-free drive, the X-axis transmission modules 21 on both sides jointly drive the Y-axis slide 13 and the Z-axis transmission module 23 to move along the X direction; the movable end of the Y-axis transmission module 22 is connected to the Z-axis transmission module 23, and the Y-axis transmission module 22 drives the Z-axis transmission module 23 and the cutting module 24 to move left and right in the Y direction; the movable end of the Z-axis transmission module 23 is connected to the cutting module 24, and the Z-axis transmission module 23 drives the cutting module 24 to move up and down in the Z direction; the X-axis transmission module 21, the Y-axis transmission module 22 and the Z-axis transmission module 23 are all linear motors, and are equipped with high-precision grating rulers to achieve full closed-loop control. The entire drive system has no mechanical transmission chain backlash and has high rigidity and high dynamic response characteristics.

[0026] Furthermore, the Y-axis slide 13 in this embodiment also has multiple hollow structures, which ensures structural rigidity while reducing the load on moving parts and improving thermal balance performance.

[0027] The cutting module 24 is a mechanical spindle, on which a cutting tool is mounted for cutting the workpiece; the worktable 25 is used to clamp the workpiece. The worktable 25 is a cradle-type five-axis rotary table, which includes an A-axis that can rotate around the Y-axis and a C-axis that can rotate around the Z-axis. The cutting module 24 and the worktable 25 are arranged vertically, which can realize the five-axis linkage machining of the workpiece in one clamping.

[0028] The tool magazine device 3 enables large-capacity tool storage and rapid tool changing. The tool magazine device 3 includes a tool storage mechanism 31 and a tool changing mechanism 32. It also includes a mounting platform 33, on which the tool storage mechanism 31 and the tool changing mechanism 32 are mounted. This structure further improves the space utilization of the tool magazine device 3. The tool storage mechanism 31 includes a fixed disk 311 and several annular mounting seats 312 rotatably connected to the lower end face of the fixed disk 311. The outer diameters of the several annular mounting seats 312 are different, and the several annular mounting seats are concentrically arranged. The diameter difference between adjacent annular mounting seats 312 is a constant value to ensure that each tool has a different outer diameter. The ring seats have uniform rotation gaps between them so that they do not interfere with each other; each ring mounting seat 312 is provided with a ring-shaped arrangement structure 3, and the ring-shaped arrangement structure 3 has at least one clearance notch 314. The ring-shaped arrangement structure 3 includes several ring-shaped arrangement of tool sleeves 315, which are used to hold tools. The ring mounting seat 312 is provided with several circumferentially arranged mounting holes, which are used to mate with the tool sleeves 315. At least one mounting hole on each ring mounting seat 312 is not used to assemble the tool sleeves 315. The mounting hole without tool sleeves 315 forms the clearance notch 314 of the ring-shaped arrangement structure 3. In this embodiment, each annular mounting seat 312 is symmetrically provided with two clearance notches 314 so that the notches can be rotated to the tool change path more quickly during rotational alignment. Each annular mounting seat 312 is linked to a drive module 316. Each annular mounting seat 312 is independently driven to rotate by the corresponding drive module 316. There is no mechanical coupling between different annular mounting seats 312. Any annular seat can be rotated independently according to a preset angle without being affected by the position of other annular seats.

[0029] The fixed plate 311 is provided with several annular slide rails 317, and the several annular slide rails 317 correspond to several annular mounting seats 312 respectively. Each annular mounting seat 312 is slidably set on the corresponding annular slide rail 317 by a slider 318, thereby ensuring the coaxiality and stability of each annular seat when rotating.

[0030] The drive module 316 includes a drive motor 3161, a reducer 3162, and a transmission gear 3163. The drive motor 3161 and the reducer 3162 are linked and fixedly installed on the fixed plate 311. The output end of the reducer 3162 is connected to the transmission gear 3163. A rack 319 is provided on the circumferential end face of the inner side of the annular mounting base 312. The transmission gear 3163 and the corresponding rack 319 mesh with each other.

[0031] In this embodiment, the drive module 316 is mounted on the upper end face of the fixed disk 311, and the annular mounting base 312 is mounted on the lower end face of the fixed disk 311. The output end of the drive module 316 passes through the fixed disk 311 and is linked to the corresponding annular mounting base 312, so that the power unit and the tool storage unit are arranged separately on both sides of the fixed disk 311, which facilitates maintenance and reduces the axial dimension of the tool magazine.

[0032] In this embodiment, the annular mounting disk 312 and the corresponding rack are integrally formed internal gear rings.

[0033] The mounting platform 33 is provided with a connecting part 331, which is in the shape of an inverted "Y". The bottom two ends of the connecting part 331 are connected to the mounting platform 33 and a clearance space 332 is provided. The top of the connecting part 331 is connected to the fixed plate 311. The moving module 321 is laid on the mounting platform 33 and passes through the clearance space 332, so that the straight movement of the tool changing mechanism 32 under the fixed plate 311 is not interfered with by the support.

[0034] The tool changing mechanism 32 includes a moving module 321 and a lifting module 322 disposed at the movable end of the moving module 321. The lifting module 322 is provided with a tool arm 323. The moving module 321 includes at least a stepper motor and a lead screw module linked to the stepper motor. A movable seat is provided at the movable end of the lead screw module. The tool arm 323 is disposed on the lifting module 322. The lifting module 322 can drive the tool arm 323 to make up-down micro-movements to align with the tool sleeve 315 on different height layers. There are two tool arms 323, which extend to both ends of the moving module 321 respectively, so that the tool picking and tool preparation actions can be completed simultaneously in a single movement stroke. The moving module 321 drives the tool arm 323 to move in a linear transmission. The tool arm 323 can pass through the clearance notch 314 of one or more annular arrangement structures 3 until it reaches the target tool position of the target annular mounting seat 312.

[0035] In this embodiment, there are three annular mounting seats 312, namely inner ring seat 312a, middle ring seat 312b and outer ring seat 312c.

[0036] When the tool on the inner ring seat 312a needs to be retrieved, the control system first instructs the drive modules 316 of the outer ring seat 312c and the middle ring seat 312b to rotate their respective clearance notches 314 to a position that is completely aligned with the linear motion path of the moving module 321. Then, the moving module 321 drives the tool arm 323 to move forward in a straight line. The tool arm 323 passes through the clearance notches 314 of the outer ring seat 312c and the middle ring seat 312b in sequence and reaches the inner ring seat 312a. The drive module 316 of the inner ring seat 312a rotates the tool sleeve 315 of the target tool position on it to the front of the tool arm 323. The lifting module 322 descends, the tool arm 323 clamps the tool and pulls it out to complete the tool retrieval action, and the moving module 321 moves in the opposite direction to carry the tool out. The process of taking the tool from the middle ring seat 312b or the outer ring seat 312c is similar; simply align the outer ring seat clearance notch on the blocking path.

[0037] The cutter arm at the end furthest from the fixed plate 311 can pass through the opening 44 and be inserted into the front chamber for the cutting device 2 to perform a tool changing action.

[0038] The door assembly 4 is located between the tool storage mechanism 31 and the tool changing mechanism 32. The door assembly 4 includes a door frame 41 and two push cylinders 42. The two ends of the door frame 41 are connected to two support seats 12. The door frame 41 has an opening 44. The two push cylinders 42 are symmetrically arranged on both sides of the opening 44, and the movable ends of the two push cylinders 42 are connected to door panels 43. In the machining state, the two push cylinders 42 extend, driving the two door panels 43 to move towards the center and fit together. The two door panels 43 cover the opening 44, completely isolating the machining area from the tool magazine area, preventing chips and coolant from splashing and contaminating the tool magazine device 3. In the tool changing state, the push cylinders 42 retract, driving the two door panels 43 to move to both ends and move away from each other. The opening 44 on the door frame 41 is fully open, allowing the tool arm 323 to pass through to realize the tool changing action.

[0039] The frame 1 is also equipped with a chip removal mechanism 5, which is located directly below the worktable 25. The chip removal mechanism 5 is used to remove a large number of chips generated during five-axis machining in a timely manner. The chip removal mechanism 5 includes a chip removal groove 51 opened on the frame 1 and a chip conveyor 52 located inside the chip removal groove 51. In this embodiment, the chip conveyor 52 is preferably a chain plate type chip conveyor. The chip removal mechanism 5 includes a motor, which is linked to the chip conveyor 52. One end of the chip removal groove 51 passes through the side end of the frame 1 to form a chip removal port 53. The chips are guided by the second protective components 62 on both sides of the worktable 25 and fall into the chip removal groove 51. The chip conveyor 52 continuously transports them to one side and finally discharges them from the chip removal port 53 into the chip collection cart.

[0040] The three-axis transmission module is equipped with several bellows covers and several cover plates. The bellows covers and several cover plates form a first protective component 61, which is used to protect the linear motor's mover, stator, guide rail, and precision components such as the grating ruler. The worktable 25 is equipped with baffles on both sides. The two baffles form a second protective component 62, which is used to guide the chips and coolant to the chip removal mechanism 5. The first protective component 61 and the second protective component 62 form an inner protective structure.

[0041] The machine tool also includes a chassis 63, with the frame 1 set inside the chassis 63. The chassis 63 forms an outer protective structure, further providing sound insulation, dust prevention, and leak prevention to ensure safe production.

[0042] When the machine tool is working, the operator fixes the workpiece to be processed on the cradle-type five-axis rotary table 25. The CNC system determines the required tool sequence according to the machining program. When the tool needs to be changed, firstly, the push cylinder 42 of the door assembly 4 drives the door plate 43 to open. Then, the annular mounting seat 312 in the tool magazine device 3, which blocks the radial outer side of the target tool, rotates independently so that its clearance notch 314 is aligned with the tool changing path. The moving module 321 drives the tool arm 323 to move forward in a straight line through the clearance notch 314. At the same time, the annular mounting seat 312 where the target tool is located rotates independently to align the target tool position with the tool arm 323. The lifting module 322 moves to make the tool arm 323 grab or place the tool. After that, the moving module 321 drives the tool arm 323 and the tool to exit, and the door assembly 4 closes. After the tool change is completed, the X-axis transmission module 21, Y-axis transmission module 22 and Z-axis transmission module 23 driven by both sides work together to quickly position the tool on the cutting module 24 above the worktable 25. Combined with the linkage of the A-axis and C-axis of the five-axis rotary table, the workpiece is cut in the best posture. Because the ring mounting bases 312 of each layer in the tool magazine device 3 can rotate independently to select tools and the tool changing path is a straight line, the tool magazine capacity is multiplied and any tool position in any layer can be quickly retrieved. The machine tool can sequentially call up dozens or even hundreds of tools required for all processes such as roughing, semi-finishing, finishing, drilling, tapping, and chamfering in one clamping, so as to complete the entire machining of complex parts with the optimal tool combination and process route.

[0043] The chips generated during processing are continuously discharged through the chip removal mechanism 5. All moving parts are tightly protected by a multi-layer protective structure to ensure the stability and reliability of the machine tool during long-term continuous processing with multiple tools and multiple processes.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center, comprising a frame, characterized in that: A cutting device and a tool magazine device are arranged on the machine frame; The cutting device comprises a three-axis transmission module, a cutting module and a workbench, the cutting module is arranged at the movable end of the three-axis transmission module, a cutting tool is mounted on the cutting module, the workbench is used for clamping a workpiece, and the cutting module and the workbench are arranged vertically; The tool magazine device comprises a tool storage mechanism and a tool changing mechanism; The tool storage mechanism comprises a fixed disc and a plurality of annular mounting seats rotatably connected with the lower end face of the fixed disc, the outer diameters of the plurality of annular mounting seats are different from each other, the plurality of annular mounting seats are arranged concentrically, the diameter difference between adjacent annular mounting seats is a fixed value, any one of the annular mounting seats is provided with an annular arrangement structure, the annular arrangement structure is reserved with at least one avoiding notch, and the annular arrangement structure comprises a plurality of tool holders arranged in an annular manner; Any one of the annular mounting seats is drivingly connected with a driving module; The tool changing mechanism comprises a moving module and a lifting module arranged at the movable end of the moving module, a tool arm is arranged on the lifting module, the moving module drives the tool arm to perform linear transmission motion, and the tool arm can pass through the avoiding notch of one or more annular arrangement structures; The machine frame is provided with a bin door assembly, the bin door assembly is located between the tool storage mechanism and the tool changing mechanism, the machine frame is divided into two bin bodies by the bin door assembly, and the workbench and the tool magazine device are respectively located in the front bin body and the rear bin body of the machine frame; 2. The dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: A plurality of annular sliding rails are arranged on the fixed disc, the plurality of annular sliding rails respectively correspond to the plurality of annular mounting seats, and each annular mounting seat is slidably arranged on the corresponding annular sliding rail through a sliding block; 3. The dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: The driving module comprises a driving motor, a speed reducer and a transmission gear, the driving motor is in driving connection with the speed reducer and is fixedly installed on the fixed disc, the output end of the speed reducer is connected with the transmission gear, a rack is arranged on the circumferential end face of the inner side of the annular mounting seat, and the transmission gear is meshed with the corresponding rack; 4. The dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: The tool magazine device further comprises a mounting table, the tool storage mechanism and the tool changing mechanism are mounted on the mounting table, a connecting portion is arranged on the mounting table, the connecting portion is in an inverted Y shape, two ends of the bottom of the connecting portion are connected with the mounting table and reserved with an avoiding space, the top end of the connecting portion is connected with the fixed disc, the moving module is laid on the mounting table, and the moving module penetrates through the avoiding space; 5. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: A plurality of circumferentially arranged mounting holes are formed in the annular mounting seat, the mounting holes are used for being assembled in cooperation with the tool holders, at least one mounting hole on any one annular mounting seat is not assembled with a tool holder, and the mounting hole not assembled with a tool holder forms the avoiding notch of the annular arrangement structure; 6. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: The machine frame comprises a base and two support seats symmetrically arranged on the base, and the machine frame is in a U shape; The bin door assembly comprises a door frame and two pushing cylinders, two ends of the door frame are connected with the two support seats, the door frame is provided with an opening, the two pushing cylinders are respectively arranged symmetrically on two sides of the opening, the movable ends of the two pushing cylinders are connected with door plates, the two door plates move towards the center to be close to each other and fit with each other to cover the opening, and the two door plates move towards two ends to be away from each other, so that the opening on the door frame is completely opened; The cutting module is a mechanical spindle; The worktable is a cradle-type five-axis rotary table, and the three-axis module includes an X-axis drive module, a Y-axis drive module, and a Z-axis drive module that are assembled together.

7. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 6, characterized in that: The X-axis transmission module is provided in two sets, which are respectively mounted on two support bases. The movable ends of the two X-axis transmission modules are connected to Y-axis slides. The Y-axis transmission module is mounted on the Y-axis slides. The movable end of the Y-axis transmission module is connected to the Z-axis transmission module. The movable end of the Z-axis transmission module is connected to the cutting module.

8. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 6 or 7, characterized in that: The X-axis transmission module, the Y-axis transmission module, and the Z-axis transmission module are all linear motors; the base and the two support seats are provided with multiple hollow structures.

9. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: The frame is also equipped with a chip removal mechanism located directly below the workbench. The chip removal mechanism includes a chip removal groove opened on the frame and a chip remover located inside the chip removal groove. The chip removal mechanism includes a motor, which is linked to the chip remover. One end of the chip removal groove passes through the side end of the frame to form a chip removal port.

10. A dual-sided synchronous backlash-free drive overhead crane type five-axis machining center according to claim 1, characterized in that: The three-axis transmission module is equipped with several bellows covers and several cover plates, which together form the first protective component. The workbench is equipped with baffles on both sides, and the two baffles form a second protective component. The first protective component and the second protective component form an inner protective structure; It also includes a chassis, the rack being housed inside the chassis, which forms an outer protective structure.

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