Four-head milling and grinding integrated machine tool for machining

Abstract

This invention discloses a four-head milling and grinding integrated machine tool for machining, relating to the field of milling and grinding technology. It includes a connecting base, with a first gantry mounted at one end and a locking mechanism mounted on a second gantry. A rotary reversing mechanism is provided on the inner side of the placement table, and a turntable is connected to the inner side of the placement table via the rotary reversing mechanism. By setting up the rotary reversing mechanism, when the positioning frame moves to be flush with the turntable, the bottom of the positioning frame contacts the top of the rack. At this time, the positioning frame continues to move downwards along the threaded rod, while the first telescopic spring retracts. When the positioning frame moves upwards, the spur gear rotates in the opposite direction, thereby causing the first transmission bevel gear to drive the second transmission bevel gear to rotate. This achieves the rotation of the workpiece on top of the turntable, allowing the workpiece to rotate 90 degrees with the turntable. During this process, there is no need to pick up, flip, or position the workpiece, simplifying operation and improving the overall processing efficiency of the equipment.

Description

Technical Field

[0001] This invention relates to the field of milling and grinding technology, specifically to a four-head milling and grinding integrated machine tool for machining. Background Technology

[0002] Milling and grinding is a general term for the four basic machining methods in mechanical processing, including milling and grinding. It is mainly used for parts processing to meet the needs of mechanical assembly. It includes four types of machine tools: milling machines, grinding machines, and milling machines. They are suitable for different types of workpieces. Milling machines use rotary milling cutters to process planes, grooves, and curved surfaces. They are highly adaptable and efficient. Grinding machines use grinding wheels and other abrasive tools for surface finishing, which can achieve high-precision processing of workpieces. Different machining methods are used in combination according to the structure and precision requirements of the parts.

[0003] Generally, when performing milling operations on mechanical workpieces, the workpiece needs to be removed from the milling machine and placed on the grinding machine, or removed from the grinding machine and placed on the milling machine, in order to achieve milling of the workpiece. During this process, the workpiece needs to be repeatedly installed and disassembled. In addition, after processing one side of a part of the workpiece, it is necessary to flip and position the workpiece. This makes the entire process cumbersome and reduces the processing efficiency of the workpiece. Summary of the Invention

[0004] The purpose of this invention is to provide a four-head milling and grinding integrated machine tool for machining, in order to solve the problem of low processing efficiency of workpieces.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a four-head milling and grinding integrated machine tool for machining, comprising a connecting seat, a first gantry mounted on one end of the connecting seat, a slide rail provided on the top of the first gantry, a slider slidably connected on the slide rail, a driving component connected to the slider provided on the top of the connecting seat, the slider being slidably connected to the slide rail via the driving component, second cylinders mounted on both sides of the connecting seat, a grinding machine provided at one end of each of the second cylinders, a linear module mounted on the top of the first gantry, a first cylinder perpendicularly arranged to the linear module on the linear module, a milling machine mounted at the bottom of the first cylinder, a placement table mounted on the top of the slider, a second gantry located outside the placement table on the top of the slider, a pressure locking component mounted on the second gantry, a rotary reversing component provided on the inner side of the placement table, and a turntable connected to the inner side of the placement table via the rotary reversing component; The positioning locking component includes a motor driver installed on the top of the second gantry frame. The inner side of the second gantry frame has threaded rods located on both sides of the placement platform. The motor output end inside the motor driver is connected to the top of the threaded rods. A locking frame is movably sleeved on the threaded rods. The top of the locking frame has first piston rods located on both sides of the threaded rods. A first piston cylinder is movably sleeved on the outer side of the first piston rods. A second telescopic spring connected to the first piston rod is located at the bottom of the inner wall of the first piston cylinder. A first solenoid valve is installed on the top of the first piston cylinder. An I-shaped sleeve plate is provided on the outer wall of the first piston cylinder. An extension rod located above the turntable is provided at the bottom of the I-shaped sleeve plate. The bottom end of the extension rod is rotatably connected to a circular positioning plate via a bearing.

[0006] As a further aspect of the present invention: the inner length and width of the card slot frame are greater than the length and width of the outer wall of the placement platform, respectively.

[0007] As a further embodiment of the present invention: the center of the circular pressing plate is coaxial with the center of the turntable.

[0008] As a further embodiment of the present invention: the top of the I-shaped sleeve plate is provided with a through hole extending to the bottom of the I-shaped sleeve plate, the diameter of the through hole is equal to the maximum diameter of the threaded rod, and the threaded rod is located inside the through hole.

[0009] As a further embodiment of the present invention: the rotary reversing component includes a rotary connecting shaft installed at the bottom of the turntable and located inside the placement platform. A chuck is provided at the bottom end of the rotary connecting shaft. A second transmission bevel gear is provided on the outer side of the rotary connecting shaft between the turntable and the chuck. A transmission shaft extending to the outer side of the placement platform is provided on the inner side of the placement platform. A first transmission bevel gear meshing with the second transmission bevel gear is provided at one end of the transmission shaft near the rotary connecting shaft. An extension rod is fixedly connected to the other end of the transmission shaft. A spur gear located outside the extension rod is rotatably connected to one end of the transmission shaft via a bearing. A pawl is rotatably connected to the inner side of the spur gear via a rotating shaft. A ratchet is provided on the outer side of the extension rod, located inside the spur gear. The pawl meshes with the ratchet. A limit frame is installed on the outer wall of the placement platform. A rack meshing with the spur gear is slidably connected to one side of the limit frame. A first telescopic spring connected to one side of the rack is provided at the bottom end of the limit frame. A locking unit is provided at the bottom of the chuck.

[0010] As a further aspect of the present invention: the number of outer teeth of the first transmission bevel gear is one-quarter of the number of outer tooth grooves of the second transmission bevel gear.

[0011] As a further embodiment of the present invention: the pawl is rotatably connected to the inner wall of the spur gear via a rotating shaft, and the pawl is connected to the outer side of the rotating shaft on the outside.

[0012] As a further embodiment of the present invention: the positioning unit includes a locking pin installed at the bottom of the chuck, a second piston cylinder is installed inside the placement platform, a second piston rod extending to the outside of the second piston cylinder is inserted into the inner side of the second piston cylinder, a second solenoid valve is installed on the outer wall of the second piston cylinder, a T-shaped block is provided at one end of the second piston rod, a limiting groove is formed on one side of the T-shaped block, and the locking pin is located inside the limiting groove.

[0013] As a further embodiment of the present invention: the center of the turntable, the center of the rotating shaft, and the center of the chuck are coaxial.

[0014] As a further embodiment of the present invention: the center of the locking pin is misaligned with the center of the chuck, and the inner width of the limiting groove is equal to the diameter of the locking pin.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting a rotary reversing component, when the locking frame moves to be flush with the turntable, the bottom of the locking frame contacts the top of the rack. At this time, the locking frame continues to move down along the threaded rod, thus pushing the rack down. During this process, the rack drives the spur gear to rotate one revolution. Since the pawl cannot restrict the ratchet, the spur gear can rotate relative to the drive shaft. At the same time, the first telescopic spring retracts. When the locking frame moves up, the rack will move up under the elastic restoring force of the first telescopic spring, thus causing the spur gear to rotate in the opposite direction. At this time, due to the engagement between the pawl and the ratchet, the extension rod rotates synchronously with the spur gear, thus causing the first drive bevel gear to drive the second drive bevel gear to rotate. This achieves the rotation of the workpiece on the top of the turntable, so that the workpiece rotates 90 degrees with the turntable. During this process, there is no need to pick up, flip, or position the workpiece, making the operation simple and improving the overall processing efficiency of the equipment. 2. By setting a locking mechanism, the motor inside the motor driver rotates the threaded rod, causing the positioning frame to move downwards. As the positioning frame moves downwards, the circular pressing plate first contacts the top of the workpiece. When the positioning frame continues to move downwards, the first piston rod moves downwards relative to the first piston cylinder. During this process, the second telescopic spring contracts, and the air around the first solenoid valve enters the first piston cylinder due to the movement of the first piston rod. When the positioning frame moves to its lowest point, the first solenoid valve is activated and closed. At this time, the air inside the first piston cylinder and above the first piston rod loses its flow space, thus achieving a fixed connection between the positioning frame and the I-shaped sleeve plate. This allows for the positioning of workpieces of different heights, preventing damage to the workpiece due to excessive pressing pressure, and also preventing the workpiece from falling during processing due to insufficient pressing pressure. 3. By setting up a locking unit, when the rotating shaft rotates with the turntable, it will drive the chuck to rotate. At this time, the locking pin will rotate along the center of the chuck. Under the action of the locking pin and the limiting slide groove, the T-block will reciprocate in the horizontal direction, thereby causing the second piston rod to reciprocate relative to the second piston cylinder. This will draw air around the second solenoid valve into the second piston cylinder, or discharge air in the second piston cylinder through the second solenoid valve. When the turntable finishes rotating, the second solenoid valve will be energized and closed, thereby depriving the air inside the second piston cylinder of its flow space. This will prevent the second piston rod from moving relative to the second piston cylinder, thus limiting the rotation of the turntable and preventing the workpiece from shifting due to equipment vibration during the milling process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the top structure of the slider of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the image; Figure 4 This is a schematic diagram showing the connection between the placement platform and the card slot frame of the present invention; Figure 5 This is a schematic diagram showing the connection between the threaded rod and the locking frame of the present invention; Figure 6 This is a schematic diagram showing the connection between the I-shaped sleeve plate and the locking frame of the present invention; Figure 7 This is a schematic diagram of the internal structure of the placement platform of the present invention; Figure 8 This is a schematic diagram showing the connection between the chuck and the second piston cylinder of the present invention.

[0017] In the diagram: 1. Connecting seat; 2. First gantry frame; 3. First cylinder; 4. Second cylinder; 5. Slide rail; 6. Driving component; 7. Slider; 8. Milling machine; 9. Grinding machine; 10. Second gantry frame; 11. Motor driver; 12. Placement table; 13. Turntable; 14. I-beam sleeve; 15. Threaded rod; 16. First solenoid valve; 17. First piston cylinder; 18. Rack; 19. Limiting frame; 20. First telescopic spring; 21. Drive shaft ; 22. Ratchet; 23. Spur gear; 24. Pawl; 25. Extension rod; 26. Locking frame; 27. Circular pressure plate; 28. Second telescopic spring; 29. ​​First piston rod; 30. First transmission bevel gear; 31. Rotary coupling; 32. Second transmission bevel gear; 33. Chuck; 34. Locking pin; 35. Limiting groove; 36. T-block; 37. Second piston cylinder; 38. Second solenoid valve; 39. Second piston rod; 40. Linear module. Detailed Implementation

[0018] 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.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0020] Please see Figures 1 to 8 In this embodiment of the invention, a four-head milling and grinding integrated machine tool for machining includes a connecting seat 1. A first gantry 2 is installed at one end of the connecting seat 1. A slide rail 5 is provided on the top of the first gantry 2. A slider 7 is slidably connected on the slide rail 5. A driving component 6 connected to the slider 7 is provided on the top of the connecting seat 1. The slider 7 is slidably connected to the slide rail 5 through the driving component 6. Second cylinders 4 are installed on both sides of the connecting seat 1. A grinding machine 9 is provided at one end of the second cylinder 4. A linear module 40 is installed on the top of the first gantry 2. A first cylinder 3 is provided on the linear module 40 and is perpendicular to the linear module 40. A milling machine 8 is installed at the bottom end of the first cylinder 3. A placement table 12 is installed on the top of the slider 7. A second gantry 10 located outside the placement table 12 is provided on the top of the slider 7. A pressure locking component is installed on the second gantry 10. A rotation reversing component is provided on the inner side of the placement table 12. A turntable 13 is connected to the inner side of the placement table 12 through the rotation reversing component. The locking mechanism includes a motor driver 11 mounted on the top of the second gantry 10. Threaded rods 15 are located on both sides of the placement platform 12 on the inner side of the second gantry 10. The motor output end of the motor driver 11 is connected to the top of the threaded rods 15. A locking frame 26 is movably sleeved on the threaded rods 15. First piston rods 29 are located on both sides of the threaded rods 15 at the top of the locking frame 26. A first piston cylinder 17 is movably sleeved on the outer side of the first piston rods 29. A second telescopic spring 28 connected to the first piston rod 29 is located at the bottom of the inner wall of the first piston cylinder 17. A first solenoid valve 16 is mounted on the top of the first piston cylinder 17. An I-shaped sleeve plate 14 is located on the outer wall of the first piston cylinder 17. An extension rod 25 located above the turntable 13 is located at the bottom of the I-shaped sleeve plate 14. A circular locking plate 27 is rotatably connected to the bottom end of the extension rod 25 via a bearing.

[0021] The inner length and width of the card slot frame 26 are greater than the outer length and width of the placement platform 12, respectively. The center of the circular pressing plate 27 is coaxial with the center of the turntable 13. The top of the I-shaped sleeve plate 14 is provided with a through hole extending to the bottom of the I-shaped sleeve plate 14. The diameter of the through hole is equal to the maximum diameter of the threaded rod 15, and the threaded rod 15 is located inside the through hole.

[0022] In this embodiment, the workpiece to be processed is first placed on top of the turntable 13. Then, the motor inside the motor driver 11 is started. The operation of the motor inside the motor driver 11 drives the threaded rod 15 to rotate, thereby causing the clamping frame 26 to move downward. The downward movement of the clamping frame 26 causes the circular pressing plate 27 to contact the top of the workpiece to be processed. At this time, the clamping frame 26 continues to move downward, causing the first piston rod 29 to move downward relative to the first piston cylinder 17. During this process, the second telescopic spring 28 contracts, and the air around the first solenoid valve 16 enters the first piston cylinder 17 due to the movement of the first piston rod 29. When the clamping frame 26 moves to its lowest position, the first solenoid valve 16 is activated, causing the first solenoid valve 16 to close. At this time, the air inside the first piston cylinder 17 and above the first piston rod 29 loses its flow space. In this way, the clamping frame 26 and the I-shaped sleeve 14 are fixedly connected, thereby positioning workpieces of different heights and preventing workpieces from being subjected to pressure. Excessive pressing pressure can damage the workpiece, while also preventing the workpiece from falling during processing due to insufficient pressing pressure. The drive unit 6 then moves the slider 7 to between the two first cylinders 3. The linear module 40, in conjunction with the first cylinders 3, moves the milling machine 8 to both sides of the workpiece. The milling machine 8 then mills both sides of the workpiece. Similarly, the drive unit 6 moves the workpiece between the two grinding machines 9, which then grind the milled workpiece. After processing both sides of the workpiece, the drive unit 6 moves the workpiece back to its initial position. The clamping frame 26 moves upward along the threaded rod 15, rotating the workpiece 90 degrees for repositioning. The clamping frame 26 then moves downward again to reposition the workpiece, allowing processing of the other two sides. The operation is simple and improves the equipment's processing efficiency.

[0023] Please refer to this carefully. Figure 2 , Figure 3 , Figure 7 , Figure 8The rotary reversing component includes a rotary coupling 31 mounted on the bottom of the turntable 13 and located inside the placement platform 12. A chuck 33 is provided at the bottom end of the rotary coupling 31. A second transmission bevel gear 32 is provided on the outer side of the rotary coupling 31, located between the turntable 13 and the chuck 33. A transmission shaft 21 extending to the outer side of the placement platform 12 is provided on the inner side of the placement platform 12. A first transmission bevel gear 30 meshing with the second transmission bevel gear 32 is provided at one end of the transmission shaft 21 near the rotary coupling 31. An extension rod 25 is fixedly connected to the other end of the transmission shaft 21. One end of shaft 21 is rotatably connected to a spur gear 23 located outside extension rod 25 via a bearing. A pawl 24 is rotatably connected to the inner side of spur gear 23 via a rotating shaft. A ratchet 22 located inside spur gear 23 is provided on the outer side of extension rod 25. The pawl 24 meshes with the ratchet 22. A limit frame 19 is installed on the outer wall of the placement platform 12. A rack 18 that meshes with spur gear 23 is slidably connected to one side of the limit frame 19. A first telescopic spring 20 connected to one side of rack 18 is provided at the bottom of the limit frame 19. A positioning unit is provided at the bottom of chuck 33.

[0024] In this configuration, the number of outer teeth of the first transmission bevel gear 30 is one-quarter of the number of outer tooth grooves of the second transmission bevel gear 32. The pawl 24 is rotatably connected to the inner wall of the spur gear 23 via a rotating shaft, and the pawl 24 is connected to the outer side of the rotating shaft of the spur gear 23.

[0025] In this embodiment, when the locking frame 26 moves to be flush with the turntable 13, the bottom of the locking frame 26 contacts the top of the rack 18. At this time, the locking frame 26 continues to move downward along the threaded rod 15, thus pushing the rack 18 downward. During this process, the rack 18 drives the spur gear 23 to rotate one revolution. Since the pawl 24 cannot restrict the ratchet 22, the spur gear 23 can rotate relative to the drive shaft 21. At the same time, the first telescopic spring 20 retracts. When the locking frame 26 moves upward, the rack 18 will retract. The spring 20 moves upward under the elastic restoring force, thereby causing the spur gear 23 to rotate in the opposite direction. At this time, due to the engagement between the pawl 24 and the ratchet 22, the extension rod 25 rotates synchronously with the spur gear 23, thereby causing the first transmission bevel gear 30 to drive the second transmission bevel gear 32 to rotate. In this way, the workpiece on the top of the turntable 13 can be rotated, so that the workpiece rotates 90 degrees with the turntable 13. During this process, there is no need to pick up, flip, or position the workpiece, which is simple to operate and also improves the overall processing efficiency of the equipment.

[0026] Please refer to this carefully. Figure 7 , Figure 8The positioning unit includes a locking pin 34 installed at the bottom of the chuck 33. A second piston cylinder 37 is installed inside the placement platform 12. A second piston rod 39 extending to the outside of the second piston cylinder 37 is inserted into the inner side of the second piston cylinder 37. A second solenoid valve 38 is installed on the outer wall of the second piston cylinder 37. A T-shaped block 36 is provided at one end of the second piston rod 39. A limiting groove 35 is opened on one side of the T-shaped block 36. The locking pin 34 is located inside the limiting groove 35.

[0027] Among them, the center of the turntable 13, the center of the rotating shaft 31, and the center of the chuck 33 are coaxial, the center of the locking pin 34 is misaligned with the center of the chuck 33, and the inner width of the limiting groove 35 is equal to the diameter of the locking pin 34.

[0028] In this embodiment, when the rotating shaft 31 rotates with the turntable 13, it drives the chuck 33 to rotate. At this time, the locking pin 34 rotates along the center of the chuck 33. Under the action of the locking pin 34 and the limiting slide groove 35, the T-block 36 reciprocates in the horizontal direction, thereby causing the second piston rod 39 to reciprocate relative to the second piston cylinder 37. This draws air around the second solenoid valve 38 into the second piston cylinder 37, or discharges air from the second piston cylinder 37 through the second solenoid valve 38. After the turntable 13 has rotated, the second solenoid valve 38 is energized and closed, thereby depriving the air inside the second piston cylinder 37 of its flow space. This prevents the second piston rod 39 from moving relative to the second piston cylinder 37, thus limiting the rotation of the turntable 13 and preventing the workpiece from shifting due to equipment vibration during milling.

[0029] The working principle of this invention is as follows: First, the workpiece to be processed is placed on the top of the turntable 13. Then, the motor inside the motor driver 11 is started. The operation of the motor inside the motor driver 11 drives the threaded rod 15 to rotate, thereby causing the positioning frame 26 to move downward. The downward movement of the positioning frame 26 causes the circular pressing plate 27 to contact the top of the workpiece to be processed. At this time, the positioning frame 26 continues to move downward, causing the first piston rod 29 to move downward relative to the first piston cylinder 17. During this process, the second telescopic spring 28 contracts, and at the same time, the air around the first solenoid valve 16 will enter the first piston cylinder 17 due to the movement of the first piston rod 29. When the positioning frame 26 moves to the lowest position, the first solenoid valve 16 is activated, causing the first solenoid valve 16 to close. At this time, the air inside the first piston cylinder 17 and above the first piston rod 29 will lose its flow space. In this way, the fixed connection between the positioning frame 26 and the I-shaped sleeve 14 can be achieved, thereby positioning workpieces of different heights and preventing workpieces from being positioned too high. Excessive pressing pressure can damage the workpiece, while insufficient pressing pressure can prevent the workpiece from falling during processing. The drive unit 6 then moves the slider 7 to between the two first cylinders 3. The linear module 40, in conjunction with the first cylinders 3, moves the milling machine 8 to both sides of the workpiece. The milling machine 8 then mills both sides of the workpiece. Similarly, the drive unit 6 moves the workpiece between the two grinding machines 9, which then grind the milled workpiece. After processing both sides of the workpiece, the drive unit 6 moves the workpiece back to its initial position. The clamping frame 26 moves upward along the threaded rod 15, rotating the workpiece 90 degrees for repositioning. The clamping frame 26 then moves downward again to reposition the workpiece, allowing processing of the other two sides. This simple operation improves the equipment's processing efficiency.

[0030] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A four-head milling and grinding integrated machine tool for machining, comprising a connecting seat (1), characterized in that, A first gantry (2) is installed at one end of the connecting seat (1). A slide rail (5) is provided on the top of the first gantry (2). A slider (7) is slidably connected on the slide rail (5). A driving component (6) connected to the slider (7) is provided on the top of the connecting seat (1). The slider (7) is slidably connected to the slide rail (5) through the driving component (6). A second cylinder (4) is installed on both sides of the connecting seat (1). A grinding machine (9) is provided at one end of the second cylinder (4). A linear module (40) is installed on the top of the first gantry (2). The linear module (40) is provided with a first cylinder (3) that is perpendicular to the linear module (40). A milling machine (8) is installed at the bottom of the first cylinder (3). A placement platform (12) is installed on the top of the slider (7). A second gantry (10) located outside the placement platform (12) is provided on the top of the slider (7). A pressure locking component is installed on the second gantry (10). A rotary reversing component is provided on the inner side of the placement platform (12). A turntable (13) is connected to the inner side of the placement platform (12) through the rotary reversing component. The locking mechanism includes a motor driver (11) mounted on the top of the second gantry (10). The inner side of the second gantry (10) is provided with threaded rods (15) located on both sides of the placement platform (12). The motor output end inside the motor driver (11) is connected to the top of the threaded rods (15). A locking frame (26) is movably sleeved on the threaded rods (15). The top of the locking frame (26) is provided with first piston rods (29) located on both sides of the threaded rods (15). The outer side of the first piston rods (29)... A first piston cylinder (17) is movably sleeved. A second telescopic spring (28) connected to a first piston rod (29) is provided at the bottom of the inner wall of the first piston cylinder (17). A first solenoid valve (16) is installed at the top of the first piston cylinder (17). An I-shaped sleeve plate (14) is provided on the outer wall of the first piston cylinder (17). An extension rod (25) located above the turntable (13) is provided at the bottom of the I-shaped sleeve plate (14). A circular pressure plate (27) is rotatably connected to the bottom end of the extension rod (25) through a bearing.

2. The four-head milling and grinding integrated machine tool for machining according to claim 1, characterized in that, The inner length and width of the card slot frame (26) are greater than the length and width of the outer wall of the placement platform (12), respectively.

3. The four-head milling and grinding integrated machine tool for machining according to claim 1, characterized in that, The center of the circular pressing plate (27) is coaxial with the center of the turntable (13).

4. The four-head milling and grinding integrated machine tool for machining according to claim 1, characterized in that, The top of the I-shaped sleeve (14) is provided with a through hole extending to the bottom of the I-shaped sleeve (14), the diameter of the through hole is equal to the maximum diameter of the threaded rod (15), and the threaded rod (15) is located inside the through hole.

5. A four-head milling and grinding integrated machine tool for machining according to claim 1, characterized in that, The rotary reversing component includes a rotary coupling (31) mounted on the bottom of the turntable (13) and located inside the placement platform (12). A chuck (33) is provided at the bottom end of the rotary coupling (31). A second transmission bevel gear (32) is provided on the outer side of the rotary coupling (31) between the turntable (13) and the chuck (33). A transmission shaft (21) extending to the outer side of the placement platform (12) is provided on the inner side of the placement platform (12). A first transmission bevel gear (30) meshing with the second transmission bevel gear (32) is provided at one end of the transmission shaft (21) near the rotary coupling (31). An extension rod (25) is fixedly connected to the other end of the transmission shaft (21). One end of (21) is rotatably connected to a spur gear (23) located outside the extension rod (25) via a bearing. The inner side of the spur gear (23) is rotatably connected to a pawl (24) via a rotating shaft. The outer side of the extension rod (25) is provided with a ratchet (22) located inside the spur gear (23). The pawl (24) meshes with the ratchet (22). The outer wall of the placement platform (12) is equipped with a limit frame (19). One side of the limit frame (19) is slidably connected to a rack (18) that meshes with the spur gear (23). The bottom end of the limit frame (19) is provided with a first telescopic spring (20) connected to one side of the rack (18). The bottom of the chuck (33) is provided with a positioning unit.

6. A four-head milling and grinding integrated machine tool for machining according to claim 5, characterized in that, The number of outer teeth of the first transmission bevel gear (30) is one-quarter of the number of outer tooth grooves of the second transmission bevel gear (32).

7. A four-head milling and grinding integrated machine tool for machining according to claim 5, characterized in that, The pawl (24) is rotatably connected to the inner wall of the spur gear (23) via a rotating shaft, and the pawl (24) is connected to the outer side of the rotating shaft on the spur gear (23).

8. A four-head milling and grinding integrated machine tool for machining according to claim 5, characterized in that, The positioning unit includes a locking pin (34) installed at the bottom of the chuck (33). A second piston cylinder (37) is installed inside the placement platform (12). A second piston rod (39) extending to the outside of the second piston cylinder (37) is inserted into the inner side of the second piston cylinder (37). A second solenoid valve (38) is installed on the outer wall of the second piston cylinder (37). A T-block (36) is provided at one end of the second piston rod (39). A limiting groove (35) is opened on one side of the T-block (36). The locking pin (34) is located inside the limiting groove (35).

9. A four-head milling and grinding integrated machine tool for machining according to claim 8, characterized in that, The center of the turntable (13), the center of the rotating shaft (31), and the center of the chuck (33) are coaxial.

10. A four-head milling and grinding integrated machine tool for machining according to claim 8, characterized in that, The center of the locking pin (34) is misaligned with the center of the chuck (33), and the inner width of the limiting groove (35) is equal to the diameter of the locking pin (34).

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