A multi-spindle numerical control machining device

Abstract

The application belongs to the technical field of numerical control machining, and particularly discloses a multi-spindle numerical control machining device, which comprises a base, a moving seat arranged on the top of the base, a machining table fixedly connected to the top of the moving seat and used for moving and placing workpieces, a fixing seat arranged on the top of the machining table, and a machining mechanism arranged on the fixing seat. The first machining head and the second machining head can be replaced by changing the structure, so that the machining efficiency is improved. The first movable block and the second movable block in the moving plate can be moved by the second electric push rod and the moving block, the first machining head can be disassembled and stored, and the second machining head can be installed at the bottom of the fixing block for continuous machining, so that the first machining head of different sizes or damaged first machining heads can be replaced in time without being disassembled and installed one by one, the accuracy of the installation position of the second machining head is improved, the machining precision is improved, and machining is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of CNC machining technology, and specifically relates to a multi-spindle CNC machining device. Background Technology

[0002] With the development of high-end manufacturing industries such as aviation, aerospace, and automobiles, the demand for machining complex parts is increasing. Multi-axis CNC machining technology can achieve precise machining of complex curved surfaces and multi-dimensional spaces through the linkage of multiple CNC axes. Multi-spindle CNC machining devices, as a specific application of multi-axis CNC machining technology, can better meet this demand.

[0003] In existing technologies, multi-axis machining devices can process multiple workpieces simultaneously. However, when it is necessary to replace multiple machining heads of different sizes or those that are damaged, they need to be disassembled and reinstalled one by one. Each installation requires repositioning, which affects the accuracy of the machining head installation position and the machining precision. It is not possible to replace multiple machining heads at the same time, which increases the downtime of the equipment and makes it difficult to improve processing efficiency.

[0004] Therefore, it is necessary to invent a multi-spindle CNC machining device to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a multi-spindle CNC machining device to solve the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-spindle CNC machining device, including a base, a movable seat on the top of the base, a machining table fixedly connected to the top of the movable seat for moving and placing workpieces, a fixed seat on the top of the machining table, and a machining mechanism on the fixed seat; The machining mechanism includes a movable limiting structure, a fixed block, a first machining head, an electric telescopic plate, and a replacement structure. The movable limiting structure is located on one side of the top of the fixed base, and a fixed block is located at the bottom of the movable limiting structure. The first machining head is fixedly connected to the bottom of the fixed block for machining workpieces. There are multiple sets of movable limiting structures, fixed blocks, and first machining heads arranged in a linear array for machining multiple workpieces simultaneously. An electric telescopic plate is located between two adjacent sets of movable limiting structures to prevent chip splashing. The top and bottom of the fixed base are equipped with replacement structures, which are the same number as the first machining heads, for replacing the first machining head.

[0007] Furthermore, the movable limiting structure includes a connecting seat, an electric telescopic rod, a main shaft, a mounting seat, a first electric push rod, and a mounting block. The connecting seat is fixedly connected to the top of the fixed seat, and the electric telescopic rod is fixedly connected to the bottom of the connecting seat. The mounting seat is fixedly connected to the bottom end of the electric telescopic rod. One side of the mounting seat is slidably connected to the fixed seat. The main shaft is fixedly connected to the top of the mounting seat. One end of the main shaft extends through the bottom of the mounting seat to the top of the fixed block. Two mounting blocks are provided at the bottom of the mounting seat. The first electric push rod is fixedly connected to the mounting block, and the first electric push rod is inserted into both sides of the fixed block.

[0008] Furthermore, a mounting rod is fixedly connected to the bottom center of the spindle. The mounting rod is inserted into the top of the fixed block. A moving groove is opened on the side of the fixed seat near the electric telescopic plate. The electric telescopic plate is fixedly connected to the inner wall of the moving groove. The electric telescopic plate is located on the top of the processing table. A limiting groove is opened on the top of the processing table. The bottom end of the electric telescopic plate is inserted into the limiting groove.

[0009] Furthermore, the replacement structure includes a second electric push rod, a moving block, a first movable block, a second movable block, a second processing head, and a drive structure. The moving block is fixedly connected to one side of the second electric push rod. The first movable block and the second movable block are arranged inside the moving block. The second processing head is located inside the second movable block. A drive structure is arranged between the first movable block and the second movable block.

[0010] Furthermore, the drive structure includes a motor, a threaded rod, a movable plate, a limiting rod, a metal block, and an electromagnetic block. The motor is fixedly connected to the bottom inner wall of the movable block, and the output end of the motor is fixedly connected to the threaded rod. The top of the threaded rod is rotatably connected to the top inner wall of the movable block. The bottom end of the threaded rod is threadedly connected to the movable plate. Limiting rods are movably connected to both sides of the movable plate. The upper and lower sides of the limiting rods are fixedly connected to the inner wall of the movable block. Electromagnetic blocks are fixedly connected to both sides of the movable plate. Metal blocks are fixedly connected to the side of the first movable block and the second movable block near the movable plate. The metal blocks are magnetically connected to the electromagnetic blocks.

[0011] Furthermore, both the first and second movable blocks are fixedly connected to a limiting block, the bottom end of the second processing head is inserted into the limiting block, and both the first and second movable blocks are fixedly connected to a slider on the side away from the moving plate, with the slider slidingly connected to the inner wall of the movable block.

[0012] Furthermore, the inner wall of the fixed base is provided with an installation groove, which is fixedly connected to the second electric push rod. A sliding block is fixedly connected to the side of the moving block near the electric telescopic plate, and the sliding block is slidably connected to the electric telescopic plate. Two slots are provided on both sides of the bottom end of the electric telescopic plate.

[0013] Furthermore, a movable structure is provided within the limiting groove. The movable structure includes a movable baffle, a compression spring, and a third electric push rod. The movable baffle is slidably connected within the limiting groove. A compression spring is fixedly connected to the bottom of the movable baffle. One end of the compression spring is fixedly connected to the inner wall of the bottom of the limiting groove. A third electric push rod is provided on both sides of the movable baffle. Grooves are provided on both sides of the inner wall of the limiting groove. One end of the third electric push rod is fixedly connected to the groove, and the other end is inserted into the slot.

[0014] Furthermore, the third electric push rod is located at the bottom of the movable baffle, the movable baffle is located at the top of the limiting groove, and its top surface is flush with the top surface of the processing table. The movable baffle and the electric telescopic plate are correspondingly set, and the compression springs are located at the bottom of the movable baffle in a linear array.

[0015] The technical effects and advantages of this invention are as follows: 1. This invention allows for the replacement of multiple first and second processing heads by changing the structure, reducing equipment downtime and improving processing efficiency. By moving the second electric push rod and the moving block, the first and second movable blocks within the moving plate can disassemble and store the first processing head, while the second processing head is installed at the bottom of the fixed block for continued processing. This facilitates timely replacement of first processing heads of different sizes or damaged ones without the need for disassembly and reassembly, improving the accuracy of the second processing head's installation position, increasing processing precision, and facilitating processing.

[0016] 2. The present invention facilitates the movement of the movable block by means of an electric telescopic plate, and can be inserted into the limiting slot. The electric telescopic plate is fixed by a movable structure, which can prevent the electric telescopic plate from splashing debris between two adjacent workpieces during processing, and can separate different processing areas to prevent mutual interference from vibration and heat transfer generated during processing, avoid collision interference between workpieces, ensure that each processing task can be carried out relatively independently and stably, and improve the processing effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is an internal structural diagram of the fixing base according to an embodiment of the present invention; Figure 3 This is a structural diagram of the base and processing mechanism according to an embodiment of the present invention; Figure 4 This is a structural diagram of the movable limiting structure and the electric telescopic plate according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the replacement structure according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the processing table according to an embodiment of the present invention; Figure 7 This is the present invention. Figure 6 Enlarged view of point A; Figure 8 This is a physical diagram of an embodiment of the present invention.

[0018] In the diagram: 1. Base; 2. Movable seat; 3. Processing table; 4. Fixed seat; 5. Fixed block; 6. First processing head; 7. Electric telescopic plate; 8. Connecting seat; 9. Electric telescopic rod; 10. Mounting seat; 11. First electric push rod; 12. Mounting block; 13. Mounting rod; 14. Second electric push rod; 15. Movable block; 16. First movable block; 17. Second movable block; 18. Second processing head; 19. Motor; 20. Movable plate; 21. Metal block; 22. Electromagnetic block; 23. Limiting block; 25. Sliding block; 26. Movable baffle; 27. Third electric push rod; 28. Compression spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0020] This invention provides a multi-spindle CNC machining device, such as... Figures 1 to 8 As shown, it includes a base 1, a movable seat 2 is provided on the top of the base 1, and a processing table 3 is fixedly connected to the top of the movable seat 2 for moving and placing workpieces. A fixed seat 4 is provided on the top of the processing table 3, and a processing mechanism is provided on the fixed seat 4. The processing mechanism includes a movable limiting structure, a fixed block 5, a first processing head 6, an electric telescopic plate 7, and a replacement structure. The movable limiting structure is located on one side of the top of the fixed base 4. The fixed block 5 is located at the bottom of the movable limiting structure. The first processing head 6 is fixedly connected to the bottom of the fixed block 5 for processing workpieces. There are multiple sets of movable limiting structures, fixed blocks 5, and first processing heads 6, which are arranged in a linear array for processing multiple workpieces simultaneously. An electric telescopic plate 7 is provided between two adjacent sets of movable limiting structures to prevent chips from splashing. The top of the fixed base 4 is provided with a replacement structure, which is the same number as the first processing head 6, for replacing the first processing head 6.

[0021] The base 1 facilitates the installation of the fixed seat 4 and the movable seat 2, allowing the movable seat 2 to move and drive the machining table 3, thereby adjusting the position of the workpiece on the machining table 3. Multiple sets of moving limiting structures, fixed blocks 5, the spindle, and the first machining head 6 enable simultaneous processing of multiple workpieces. An electric telescopic plate 7 extends onto the machining table 3, separating adjacent workpieces to prevent collisions and interference, and to prevent mutual interference from vibrations and heat transfer during processing. This ensures that each processing task can be performed relatively independently and stably, while also effectively blocking chips, thus improving processing accuracy and quality. The replacement structure allows for the simultaneous replacement of multiple damaged or different-sized first machining heads 6, enabling the processing of workpieces of different sizes, improving the comprehensiveness of processing, and increasing the continuity of processing by the first machining head 6, reducing equipment downtime and improving processing efficiency. When a damaged or different-sized first machining head 6 needs to be replaced, the replacement structure allows for the disassembly of the first machining head 6 and the installation of a second machining head 18, allowing the second machining head 18 to continue to be used and adaptable to different-sized workpieces, improving processing effectiveness.

[0022] like Figures 1 to 4 As shown, the movable limiting structure includes a connecting seat 8, an electric telescopic rod 9, a main shaft, a mounting seat 10, a first electric push rod 11, and a mounting block 12. The connecting seat 8 is fixedly connected to the top of the fixed seat 4. The electric telescopic rod 9 is fixedly connected to the bottom of the connecting seat 8. The mounting seat 10 is fixedly connected to the bottom of the electric telescopic rod 9. One side of the mounting seat 10 is slidably connected to the fixed seat 4. The main shaft is fixedly connected to the top of the mounting seat 10. One end of the main shaft passes through the bottom of the mounting seat 10 and extends to the top of the fixed block 5. Two mounting blocks 12 are provided at the bottom of the mounting seat 10. The first electric push rod 11 is fixedly connected to the mounting block 12. The first electric push rod 11 is inserted into both sides of the fixed block 5. The mounting rod 13 is fixedly connected to the middle of the bottom of the main shaft. The mounting rod 13 is inserted into the top of the fixed block 5. A moving groove is opened on the side of the fixed seat 4 near the electric telescopic plate 7. The electric telescopic plate 7 is fixedly connected to the inner wall of the moving groove. The electric telescopic plate 7 is located on the top of the processing table 3. A limiting groove is opened on the top of the processing table 3. The bottom end of the electric telescopic plate 7 is inserted into the limiting groove.

[0023] The fixed base 4 facilitates the installation of the processing mechanism, enabling it to process workpieces fixed on the processing table 3. The connecting base 8 and the mounting base 10 facilitate the installation of the electric telescopic rod 9, spindle, fixed block 5, and first processing head 6 on one side of the fixed base 4. The mounting rod 13 and the first electric push rod 11 enable the fixed block 5 and the first processing head 6 to be installed at the bottom of the spindle. When the electric telescopic rod 9 is activated, it drives the mounting base 10, spindle, fixed block 5, and first processing head 6 to move downwards, allowing the first processing head 6 to move to the top of the workpiece for processing. The moving slot facilitates the installation of the electric telescopic plate 7. When the electric telescopic plate 7 moves downwards and engages with the limiting slot, it is fixed on the processing table 3, separating adjacent workpieces and preventing debris from splashing or colliding with each other, thus affecting the processing effect of the first processing head 6.

[0024] like Figure 3 , Figure 5 As shown, the replacement structure includes a second electric push rod 14, a moving block 15, a first movable block 16, a second movable block 17, a second processing head 18, and a drive structure. The moving block 15 is fixedly connected to one side of the second electric push rod 14. The first movable block 16 and the second movable block 17 are arranged inside the moving block 15. The second processing head 18 is located inside the second movable block 17. A drive structure is arranged between the first movable block 16 and the second movable block 17.

[0025] The drive structure includes a motor 19, a threaded rod, a movable plate 20, a limiting rod, a metal block 21, and an electromagnetic block 22. The motor 19 is fixedly connected to the bottom inner wall of the movable block 15. The output end of the motor 19 is fixedly connected to the threaded rod. The top of the threaded rod is rotatably connected to the top inner wall of the movable block 15. The bottom end of the threaded rod is threadedly connected to the movable plate 20. Limiting rods are movably connected to both sides of the movable plate 20. The upper and lower sides of the limiting rods are fixedly connected to the inner wall of the movable block 15. Electromagnetic blocks 22 are fixedly connected to both sides of the movable plate 20. The first movable block 16 and the second movable block 17 are both fixedly connected to the side of the movable plate 20. The metal block 21 is magnetically connected to the electromagnetic block 22.

[0026] When it is necessary to replace the first processing head 6 with a different size or if it is damaged, first activate the second electric push rod 14 to push the moving block 15 to the bottom of the mounting base 10, so that the first movable block 16 corresponds to the first processing head 6. Then, de-energize the electromagnetic block 22 near the second movable block 17 on the moving plate 20, so that the electromagnetic block 22 no longer generates magnetic force and no longer attracts the metal block 21 connected to the second movable block 17. Start the motor 19 to drive the threaded rod to rotate along the inner wall of the top of the moving block 15. Through the limiting action of the limiting rod, the moving plate 20 moves upward along the threaded rod. The electromagnetic block 22 near the first movable block 16 and the metal block 21 connected to the first movable block 16 are magnetically attracted, causing the moving plate 20 to move the first movable block 16 upward to the top of the moving block 15, and placing the first movable block 16 at the bottom of the first processing head 6. By activating the first electric push rod 11, it retracts and is no longer inserted into the fixed block 5, causing the first processing head 6 to move downward into the first movable block 16, with the fixed block 5 at the top of the first movable block 16. Then, through the action of the motor 19, the threaded rod, the moving plate 20, the electromagnetic block 22, the metal block 21, and the limiting rod... The first movable block 16 drives the first processing head 6 to move into the moving block 15. The second electric push rod 14 continues to push the moving block 15, causing the second movable block 17 to move to the bottom of the spindle. The electromagnetic block 22 near the first movable block 16 of the moving plate 20 is de-energized, no longer generating magnetic force to connect with the metal block 21 connected to the first movable block 16. The electromagnetic block 22 near the second movable block 17 of the moving plate 20 is energized to generate magnetic force, attracting the metal block 21 connected to the second movable block 17. Then, through the motor 19, threaded rod, moving plate 20, electromagnetic block 22, and metal block... The action of the 21 and the limiting rod causes the second movable block 17 to move the second processing head 18 to the bottom of the spindle, and causes the mounting rod 13 to be inserted into the fixing block 5 on the top of the second processing head 18. The first electric push rod 11 moves and is inserted into the fixing block 5 on the top of the second processing head 18, thus installing the second processing head 18 at the bottom of the spindle. Then the second movable block 17 moves into the moving block 15, and the second electric push rod 14 drives the moving block 15 to move back to its original position, so that the second processing head 18 can continue processing. This improves the accuracy of the processing head's position and facilitates processing.

[0027] like Figure 5 As shown, a limiting block 23 is fixedly connected inside both the first movable block 16 and the second movable block 17. The bottom end of the second processing head 18 is inserted into the limiting block 23. A slider is fixedly connected to the side of the first movable block 16 and the second movable block 17 away from the moving plate 20. The slider is slidably connected to the inner wall of the moving block 15.

[0028] The limiting block 23 facilitates the insertion of the first processing head 6 or the second processing head 18, improving the stability of the first processing head 6 or the second processing head 18 on the first movable block 16 or the second movable block 17, and facilitating replacement. When the first movable block 16 or the second movable block 17 moves, it drives the slider to move along the inner wall of the moving block 15, thereby improving the stability of the movement of the first movable block 16 and the second movable block 17, making it easier to accurately replace the first processing head 6 or the second processing head 18, and improving the processing accuracy of subsequent processing.

[0029] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the inner wall of the fixed base 4 has an installation groove, which is fixedly connected to the second electric push rod 14. The moving block 15 is fixedly connected to the sliding block 25 on the side near the electric telescopic plate 7. The sliding block 25 is slidably connected to the electric telescopic plate 7. Two slots are opened on both sides of the bottom end of the electric telescopic plate 7. A movable structure is set in the limiting groove. The movable structure includes a movable baffle 26, a compression spring 28 and a third electric push rod 27. The movable baffle 26 is slidably connected in the limiting groove. The bottom of the movable baffle 26 is fixedly connected to the compression spring 28. One end of the compression spring 28 is fixedly connected to the bottom inner wall of the limiting groove. The third electric push rod 27 is set on both sides of the movable baffle 26. The inner walls on both sides of the limiting groove are provided with grooves. One end of the third electric push rod 27 is fixedly connected to the groove and the other end is inserted into the slot.

[0030] The mounting slot facilitates the installation of the second electric push rod 14, enabling it to move the moving block 15 and the sliding block 25. This allows the sliding block 25 to move along one side of the electric telescopic plate 7, improving the stability of the moving block 15's movement and enhancing the stability of the replacement between the first processing head 6 and the second processing head 18, thus facilitating processing. When the electric telescopic plate 7 extends, its bottom moves onto the movable baffle 26, pushing the movable baffle 26 downwards and compressing the compression spring 28. This causes the bottom of the electric telescopic plate 7 to move into the limiting slot, and then the third electric push rod 27 is activated to engage with the slot at the bottom of the electric telescopic plate 7, thereby fixing the position of the electric telescopic plate 7 and improving its stability. This also divides the area of ​​the processing table 3, facilitating the processing of multiple workpieces.

[0031] like Figures 6 to 7 As shown, the third electric push rod 27 is located at the bottom of the movable baffle 26, the movable baffle 26 is located at the top of the limiting groove, and its top surface is flush with the top surface of the processing table 3. The movable baffle 26 is correspondingly set with the electric telescopic plate 7, and the compression spring 28 is located at the bottom of the movable baffle 26 in a linear array.

[0032] The electric telescopic plate 7 inserted into the limiting slot can be fixed by the third electric push rod 27. After the workpiece on the processing table 3 is processed, the third electric push rod 27 is activated to retract and no longer limit the electric telescopic plate 7. Then the electric telescopic plate 7 is retracted, so that the movable baffle 26 is no longer squeezed. The movable baffle 26 is pushed to the top of the limiting slot by the action of the compression spring 28, and is flush with the top surface of the processing table 3. This can prevent debris from falling into the limiting slot, affecting the subsequent fixing of the electric telescopic plate 7, and making it difficult to improve the stability of the electric telescopic plate 7. At the same time, it is convenient to remove the processed workpiece, improve convenience, and facilitate the fixing of multiple unprocessed workpieces for continued processing.

[0033] Working principle of this invention: Reference Figures 1 to 8 As shown, in use, the workpiece is first fixed on the processing table 3. The processing table 3 is moved by the movable seat 2 to adjust the position of the workpiece. After adjustment, the electric telescopic plate 7 is activated to move downward. When the bottom end of the electric telescopic plate 7 moves to the movable baffle 26 on the processing table 3, it pushes the movable baffle 26 into the limiting groove, squeezing the compression spring 28. When the movable baffle 26 moves to the bottom end of the limiting groove, the third electric push rod 27 is activated to insert into the slot at the bottom end of the electric telescopic plate 7, thereby fixing the bottom end of the electric telescopic plate 7 in the limiting groove, thus separating two adjacent workpieces. Then, the electric telescopic rod 9 is activated to push the mounting seat 10 downward along one side of the fixed seat 4, so that the spindle, mounting rod 13, fixing block 5 and the first processing head 6 on the mounting seat 10 move downward, so that the first processing head 6 moves to the position to be processed, and the workpiece is processed by the spindle and the first processing head 6.

[0034] When the first processing head 6 is damaged or a different size of the first processing head 6 needs to be installed, firstly, the second electric push rod 14 is activated to push the moving block 15, which in turn moves the sliding block 25 along the electric telescopic plate 7 to the bottom of the mounting base 10, so that the first movable block 16 corresponds to the first processing head 6. Then, the electromagnetic block 22 near the second movable block 17 of the moving plate 20 is de-energized, so that the electromagnetic block 22 at this point no longer generates magnetic force and no longer attracts the metal block 21 connected to the second movable block 17. Then, the motor 19 is activated to drive the threaded rod to rotate along the inner wall of the top of the moving block 15. Through the limiting action of the limiting rod, the... The movable plate 20 moves upward along the threaded rod. Through the magnetic attraction between the electromagnetic block 22 near the first movable block 16 and the metal block 21 connected to the first movable block 16, the movable plate 20 moves, causing the first movable block 16 to move upward to the top of the movable block 15, and placing the first movable block 16 at the bottom of the first processing head 6. By activating the first electric push rod 11, it is no longer inserted into the fixed block 5, causing the first processing head 6 to move downward into the first movable block 16, placing the fixed block 5 at the top of the first movable block 16. Then, through the motor 19, the threaded rod, and the movable plate 20... The action of plate 20, electromagnetic block 22, metal block 21, and limiting rod causes the first movable block 16 to move the first processing head 6 into the moving block 15. The second electric push rod 14 then pushes the moving block 15 to continue moving, causing the second movable block 17 to move to the bottom of the spindle. This de-energizes the electromagnetic block 22 near the first movable block 16, preventing it from generating magnetic force and connecting to the metal block 21 connected to the first movable block 16. Conversely, energizing the electromagnetic block 22 near the second movable block 17 generates magnetic force, attracting it to the metal block 21 connected to the second movable block 17. Finally, the motor 1... 9. The threaded rod, movable plate 20, electromagnetic block 22, metal block 21 and limiting rod work together to move the second movable block 17 to the bottom of the spindle, and to insert the mounting rod 13 into the fixing block 5 at the top of the second processing head 18. The first electric push rod 11 moves and inserts into the fixing block 5 at the top of the second processing head 18, thus installing the second processing head 18 at the bottom of the spindle. Then the second movable block 17 moves into the movable block 15, and the second electric push rod 14 drives the movable block 15 to move back to its original position, so that the second processing head 18 can continue processing.

[0035] After processing is completed, the electric telescopic rod 9 drives the mounting base 10, spindle, fixing block 5 and second processing head 18 to the top of the fixing base 4. The third electric push rod 27 retracts and no longer inserts into the slot, so that the bottom end of the electric telescopic plate 7 is no longer fixed in the limiting groove. The electric telescopic plate 7 retracts and no longer squeezes the movable baffle 26. Through the action of the compression spring 28, the movable baffle 26 moves to its original position and is flush with the top surface of the processing table 3. Then the processed workpiece is removed from the worktable, and the unprocessed workpiece is fixed on the processing table 3 for further processing.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A multi-spindle CNC machining device, comprising a base (1), characterized in that: The base (1) is provided with a movable seat (2) on top, and a processing table (3) is fixedly connected to the top of the movable seat (2) for moving and placing workpieces. The processing table (3) is provided with a fixed seat (4) on top, and a processing mechanism is provided on the fixed seat (4). The processing mechanism includes a movable limiting structure, a fixed block (5), a first processing head (6), an electric telescopic plate (7), and a replacement structure. The movable limiting structure is set on the top side of the fixed base (4). The fixed block (5) is set at the bottom of the movable limiting structure. The first processing head (6) is fixedly connected to the bottom of the fixed block (5) for processing workpieces. There are multiple sets of the movable limiting structure, the fixed block (5), and the first processing head (6) and they are arranged in a linear array for processing multiple workpieces at the same time. An electric telescopic plate (7) is set between two adjacent sets of the movable limiting structure to prevent chips from splashing. The top of the fixed base (4) is set with a replacement structure. The number of replacement structures is the same as the number of first processing heads (6) for replacing the first processing head (6). The replacement structure includes a second electric push rod (14), a moving block (15), a first movable block (16), a second movable block (17), a second processing head (18), and a drive structure. The second electric push rod (14) is fixedly connected to the moving block (15) on one side. The first movable block (16) and the second movable block (17) are arranged inside the moving block (15). The second processing head (18) is located inside the second movable block (17). A drive structure is arranged between the first movable block (16) and the second movable block (17). The drive structure includes a motor (19), a threaded rod, a movable plate (20), a limiting rod, a metal block (21), and an electromagnetic block (22). The motor (19) is fixedly connected to the bottom inner wall of the movable block (15). The output end of the motor (19) is fixedly connected to a threaded rod. The top of the threaded rod is rotatably connected to the top inner wall of the movable block (15). The bottom end of the threaded rod is threadedly connected to the movable plate (20). The movable plate (20) is movably connected to both sides of the movable plate (20). The upper and lower sides of the limiting rod are fixedly connected to the inner wall of the movable block (15). The electromagnetic block (22) is fixedly connected to both sides of the movable plate (20). The first movable block (16) and the second movable block (17) are both fixedly connected to the side of the movable plate (20). The metal block (21) and the electromagnetic block (22) are magnetically connected. Both the first movable block (16) and the second movable block (17) are fixedly connected to a limiting block (23). The bottom end of the second processing head (18) is inserted into the limiting block (23). Both the first movable block (16) and the second movable block (17) are fixedly connected to a slider on the side away from the moving plate (20). The slider is slidably connected to the inner wall of the moving block (15).

2. The multi-spindle CNC machining device according to claim 1, characterized in that: The movable limiting structure includes a connecting seat (8), an electric telescopic rod (9), a main shaft, a mounting seat (10), a first electric push rod (11), and a mounting block (12). The connecting seat (8) is fixedly connected to the top of the fixed seat (4). The electric telescopic rod (9) is fixedly connected to the bottom of the connecting seat (8). The mounting seat (10) is fixedly connected to the bottom end of the electric telescopic rod (9). One side of the mounting seat (10) is slidably connected to the fixed seat (4). The main shaft is fixedly connected to the top of the mounting seat (10). One end of the main shaft passes through the bottom of the mounting seat (10) and extends to the top of the fixed block (5). Two mounting blocks (12) are provided at the bottom of the mounting seat (10). The first electric push rod (11) is fixedly connected to the mounting block (12). The first electric push rod (11) is inserted into both sides of the fixed block (5).

3. The multi-spindle CNC machining device according to claim 2, characterized in that: A mounting rod (13) is fixedly connected to the bottom center of the spindle. The mounting rod (13) is inserted into the top of the fixing block (5). A moving groove is opened on the side of the fixing seat (4) near the electric telescopic plate (7). The electric telescopic plate (7) is fixedly connected to the inner wall of the moving groove. The electric telescopic plate (7) is located on the top of the processing table (3). A limiting groove is opened on the top of the processing table (3). The bottom end of the electric telescopic plate (7) is inserted into the limiting groove.

4. The multi-spindle CNC machining device according to claim 3, characterized in that: The inner wall of the fixed base (4) is provided with an installation groove, which is fixedly connected to the second electric push rod (14). The moving block (15) is fixedly connected to the sliding block (25) on the side near the electric telescopic plate (7). The sliding block (25) is slidably connected to the electric telescopic plate (7). Two slots are provided on both sides of the bottom end of the electric telescopic plate (7).

5. The multi-spindle CNC machining device according to claim 4, characterized in that: The defined groove is provided with a movable structure, which includes a movable baffle (26), a compression spring (28) and a third electric push rod (27). The movable baffle (26) is slidably connected in the defined groove. The bottom of the movable baffle (26) is fixedly connected to the compression spring (28). One end of the compression spring (28) is fixedly connected to the inner wall of the bottom of the defined groove. The movable baffle (26) is provided with a third electric push rod (27) on both sides. The inner walls on both sides of the defined groove are provided with grooves. One end of the third electric push rod (27) is fixedly connected to the groove, and the other end is inserted into the slot.

6. The multi-spindle CNC machining device according to claim 5, characterized in that: The third electric push rod (27) is located at the bottom of the movable baffle (26), the movable baffle (26) is located at the top of the limiting groove, and its top surface is flush with the top surface of the processing table (3). The movable baffle (26) is correspondingly set with the electric telescopic plate (7), and the compression spring (28) is located at the bottom of the movable baffle (26) in a linear array.

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