A multi-spindle machine tool

Abstract

The application discloses a multi-spindle machining tool, and relates to the field of multi-spindle machining tools. The multi-spindle machining tool comprises a base, the base comprises a seat box and a plurality of groups of vertical pedestals, the vertical pedestals are vertically fixed on the upper end face of the seat box, the front end face of the vertical pedestal is slidably provided with an adjustable shaft seat group, a driving electric cylinder for driving the adjustable shaft seat group to move transversely is arranged on the vertical pedestal, and the front end of the adjustable shaft seat group is provided with a plurality of groups of clamping seats. The multi-spindle machining tool can realize parallel machining, and the production efficiency is remarkably improved. Each adjustable shaft seat group can be independently and accurately adjusted transversely on the vertical pedestal, and the clamping seat on the adjustable shaft seat group can be independently adjusted in height through the vertical electric cylinder.

Description

Technical Field

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

[0002] Multi-spindle CNC machining tools are commonly used processing equipment in the field of batch parts processing. They are widely used in the cutting and processing of automotive engine parts, hardware precision molds, and small and medium-sized irregular structural parts in aerospace. They can complete multiple processing steps in one clamping by cooperating multiple spindles, and theoretically have higher production efficiency compared with traditional single-spindle machine tools.

[0003] Currently, the most common multi-spindle machining centers are fixed-layout multi-spindle machine tools. In these machines, multiple machining spindles are pre-installed on the machine tool base in fixed relative positions. Machining parameters can only be adjusted by moving the worktable. The spindles themselves cannot be adjusted independently. They can only be adapted to batch processing tasks of a single specification and a single process. When it is necessary to process workpieces of different sizes and shapes, or to switch machining processes, it is necessary to completely disassemble and replace the spindle mounting base and recalibrate the positioning. The changeover time is long, often requiring several hours or even days to complete. They are extremely unsuitable for flexible production of multiple varieties and small batches.

[0004] Existing cutting environment protection and control solutions for multi-spindle machining tools also have significant shortcomings: during high-speed cutting, a large amount of smoke and metal chips are continuously generated, and a large amount of cutting heat accumulates in the cutting area. This not only endangers the health of operators, but also causes tool overheating and wear, workpiece thermal deformation, and directly affects machining accuracy and tool life. Summary of the Invention

[0005] In order to address the shortcomings of existing multi-spindle machining equipment, such as poor flexibility, poor dust removal and cooling effect, and high maintenance difficulty, this application provides a multi-spindle machining tool.

[0006] This invention is implemented as follows: A multi-spindle machining center includes a base, which comprises a base box and several sets of vertical supports. The vertical supports are vertically fixed to the upper surface of the base box. An adjustable spindle support assembly is slidably mounted on the front end face of the vertical supports, and a drive cylinder is provided on the vertical supports to drive the adjustable spindle support assembly to move laterally. Several sets of clamping seats are mounted on the front end of the adjustable spindle support assembly, and a vertical electric cylinder for adjusting the height of the clamping seats is also fixedly mounted on the adjustable spindle support assembly. An integrated housing is sleeved and fixedly mounted in the clamping seats. A dust removal pipe seat and a cooling pipe assembly are fixedly mounted on the inner side of the integrated housing, and a transmission tool spindle seat is vertically mounted at the center of the integrated housing. A spindle motor for driving the transmission tool spindle seat to rotate is also fixedly mounted on the adjustable spindle support assembly.

[0007] By adopting the above technical solution and rationally dividing the base structure, the base box and vertical platform are combined to provide a stable installation foundation for the entire machine tool, ensuring the overall rigidity of subsequent machining processes. The drive electric cylinder drives the adjustable spindle assembly to move laterally, while the vertical electric cylinder adjusts the height of the clamping seat, enabling flexible adjustment of the adjustable spindle assembly and clamping seat in both the horizontal and vertical directions. This adapts to the needs of workpieces of different sizes and machining positions, improving the machine tool's versatility. The clamping seat securely mounts and fixes the integrated housing, ensuring the installation stability of the integrated housing and the dust removal pipe seat, cooling pipe assembly, and transmission tool shaft seat installed on it. The spindle motor drives the transmission tool spindle seat to rotate stably, providing sufficient power for cutting. At the same time, the dust removal tube seat and the cooling tube assembly are integrated into the integrated housing, realizing the simultaneous adsorption of dust and cooling of the tool / machining area during the machining process. This reduces the impact of dust on machining accuracy, environment and operators, reduces the rate of tool wear due to high temperature, extends tool life, and ensures machining accuracy and efficiency. Overall, it realizes the integrated, efficient and precise operation of multi-spindle machining.

[0008] Furthermore, several sets of support feet are fixedly installed on the lower end face of the base box, and a worktable corresponding to the transmission cutter shaft seat is provided on the upper end face of the base box. An internal electric cylinder for driving the worktable to move back and forth is also installed on the base box. A transverse guide rail for sliding installation of the adjustable spindle seat assembly is fixedly installed on the front end face of the vertical base. The adjustable spindle seat assembly includes a back plate seat and an integrated spindle seat. A clamping slide seat that cooperates with the transverse guide rail is provided on the rear end face of the back plate seat. The integrated spindle seat is slidably installed on the back plate seat, and a top motor is fixedly installed on the upper end of the back plate seat. The output end of the top motor is connected to a drive screw for adjusting the height of the integrated spindle seat. The drive screw is threadedly connected to the integrated spindle seat. A cylinder seat for installing the vertical electric cylinder is also provided on the front end face of the integrated spindle seat.

[0009] By adopting the above technical solutions, the support feet at the lower end of the machine base provide stable support and reduce vibration during machine tool operation, preventing vibration from affecting machining accuracy. The adjustable height design adapts to different installation environments, and the shock-absorbing and anti-slip characteristics further enhance the machine tool's operational stability. The worktable at the upper end of the machine base is correspondingly positioned with the transmission tool spindle seat, providing a stable platform for the workpiece. The internal electric cylinder on the machine base drives the worktable to move back and forth, enabling adjustment of the workpiece's machining position. Combined with the lateral adjustment of the adjustable spindle assembly and the vertical adjustment of the clamping seat, a multi-directional adjustment system is formed, significantly improving the machine tool's machining flexibility and adaptability. The lateral guide rails on the vertical platform cooperate with the clamping slides of the adjustable spindle assembly's backplate, ensuring the smoothness and accuracy of the adjustable spindle assembly's lateral movement and preventing jamming or offset during movement. The adjustable spindle seat assembly adopts a combination structure of a back plate seat and an integrated spindle seat. The top motor drives the integrated spindle seat to slide along the back plate seat through a drive screw, realizing precise micro-adjustment of the height of the integrated spindle seat. This further optimizes the height adjustment accuracy of the clamping seat and the integrated housing seat. The cylinder seat is set to provide a stable mounting carrier for the vertical electric cylinder, ensuring the stability and reliability of the vertical electric cylinder adjustment action, and improving the overall adjustment accuracy, running stability and machining adaptability of the machine tool.

[0010] Furthermore, the adjusting clamping seat includes an arc-shaped housing, connecting ear straps, a limiting block, and a protective tube. The connecting ear straps are configured in two sets, and the two sets of connecting ear straps are respectively fixed at both ends of the arc-shaped housing. The two sets of connecting ear straps are fixed together by bolts. An external plate connected to the output end of the vertical electric cylinder is integrally formed on the outer surface of the arc-shaped housing. The limiting block is fixedly installed on the outer surface of the arc-shaped housing. The protective tube is inclinedly arranged on the limiting block and is fixedly connected to the limiting block.

[0011] By adopting the above technical solution, the arc-shaped base shell conforms to the shape of the integrated housing, achieving tight clamping of the integrated housing. Two sets of connecting ear straps are fixed with bolts, allowing for quick installation and disassembly of the clamping seat, facilitating maintenance and replacement of the integrated housing, while also improving clamping stability and preventing loosening of the integrated housing during machining. The external plate on the arc-shaped base shell connects to the output end of the vertical electric cylinder, ensuring that the adjustment force of the vertical electric cylinder can be stably transmitted to the clamping seat, achieving smooth lifting and lowering of the clamping seat and the integrated housing, and ensuring accurate height adjustment. The limiting block provides stable limiting installation of the protective tube. The inclined protective tube effectively protects the internal external air pipes, external liquid supply pipes, and other pipelines, preventing damage from cutting debris and cutting fluid during machining. It also streamlines the pipeline routing, preventing entanglement that could affect machining operations. Overall, this improves the clamping stability, ease of installation and disassembly of the clamping seat, and the protection effect on the pipelines, ensuring the continuity of machine tool processing.

[0012] Furthermore, the integrated housing includes a positioning ring seat, a plug-in cover, and a top ring seat for mounting the dust removal pipe seat. The positioning ring seat has a positioning groove on its side for mounting the limiting seat block. The plug-in cover is plugged into the positioning ring seat and is fixedly connected to the positioning ring seat. The top ring seat is located at the center of the upper end face of the plug-in cover and is integrally formed with the plug-in cover. A movable frame is fixedly installed on the outer side of the top ring seat, and a guide frame for sliding installation of the movable frame is fixedly provided at the front end of the integrated spindle seat.

[0013] By adopting the above technical solution, the positioning groove on the side of the positioning ring seat cooperates with the limiting block of the clamping seat to achieve precise positioning and rapid installation of the clamping seat and the integrated housing. This avoids installation misalignment that could lead to positional deviations in the dust removal pipe seat, cooling pipe assembly, and transmission tool shaft seat, ensuring machining accuracy. The plug-in cover is plugged into and fixed to the positioning ring seat, facilitating maintenance and repair of the internal components of the integrated housing, while also improving the sealing performance of the integrated housing and preventing cutting fluid and dust from entering and affecting component operation. The top ring seat and the plug-in cover are integrally formed, providing a stable mounting base for the dust removal pipe seat and transmission tool shaft seat, improving the rigidity of component installation. The movable bracket on the top ring seat slides in cooperation with the guide bracket on the integrated spindle seat, ensuring the stability and synchronization of the integrated housing during vertical lifting driven by the electric cylinder, preventing shaking and deviation, further ensuring precise coordination of dust removal, cooling, and cutting operations, and improving the stability and reliability of machine tool processing.

[0014] Furthermore, the positioning ring seat includes a bottom ring portion and a top ring shell. The top ring shell is coaxially disposed on the upper end face of the bottom ring portion and is integrally formed with the bottom ring portion. The lower end face of the bottom ring portion is provided with a light strip groove, and the side of the bottom ring portion is provided with a connecting side hole communicating with the light strip groove. The insertion cover includes a cover plate and an inner insertion ring. The inner insertion ring is coaxially disposed on the lower end face of the cover plate and is inserted and fixed in the top ring shell.

[0015] By adopting the above technical solution, the positioning ring seat uses an integrated structure of the bottom ring and top ring shell, which improves the structural rigidity and integrity of the positioning ring seat, avoids deformation and loosening of the split structure during processing, and provides a stable mounting carrier for other components of the integrated housing. The LED strip groove in the bottom ring can be used to install industrial-grade LED strips, providing clear lighting for the processing area, facilitating operators to observe the processing status and perform maintenance and repair, improving operational convenience and processing safety; the connecting side hole provides a channel for the LED strip wiring connection, avoiding messy wiring from affecting processing, and protecting the wiring from damage. The inner insert ring of the plug-in cover is plugged and fixed to the top ring shell of the positioning ring seat, further improving the connection sealing and firmness between the plug-in cover and the positioning ring seat. It can be used with a sealing ring to further prevent cutting fluid and dust from entering the interior of the integrated housing, protecting internal components such as the dust removal pipe seat, cooling pipe assembly, and transmission tool shaft seat, extending the service life of components, and ensuring long-term stable operation of the machine tool.

[0016] Furthermore, the dust removal tube seat includes an adsorption shell, a top tube, a bent insert, and an external air pipe. The adsorption shell is configured as an annular structure and is fixedly attached to the inner side of the top annular shell. The top tube is sealed and fixed to the upper end face of the adsorption shell. One end of the bent insert is fixedly installed on the inner side of the arc-shaped seat shell, and the other end of the bent insert is inserted into the top tube. The external air pipe is set in the protective tube and is sealed to the bent insert.

[0017] By adopting the above technical solution, the annular adsorption shell is fitted and fixed to the inner side of the top ring shell, which can maximize the coverage of the processing area and capture the fumes generated during processing from all directions, thereby improving the fume adsorption efficiency. The top tube is sealed and fixed to the adsorption shell, and the bent insert is inserted into the top tube and sealed to the external air pipe, ensuring the airtightness of the fume adsorption channel and preventing fume leakage. At the same time, the flexible design of the bent insert is adapted to the lifting and lowering action of the clamping seat, preventing damage to the pipeline by pulling. The external air pipe is set inside the protective tube to further ensure the safety of the pipeline. The external air pipe is connected to the external fume treatment system, which can discharge the adsorbed fumes in a timely manner, improve the processing environment, and reduce the impact of fumes on processing accuracy, tools, and operators. At the same time, the integration of the airflow sensor can monitor the adsorption effect in real time, which is convenient for timely adjustment and ensures the stability of fume treatment. Overall, it achieves efficient, sealed, and stable treatment of processing fumes.

[0018] Furthermore, the cooling tube assembly includes a liquid outlet seat, a matching vertical tube, a liquid delivery arc tube, and an insertion liquid tube connected to the head of the matching vertical tube. There are at least two sets of liquid outlet seats, and the liquid outlet seats are fixedly installed on the inner side of the top ring shell. The matching vertical tube is vertically fixed on the liquid outlet seat. The liquid delivery arc tube is fixedly installed on the inner side of the arc-shaped seat shell, and one end of the liquid delivery arc tube extends into the protective tube. An external liquid supply tube is provided in the protective tube and is sealed to the liquid delivery arc tube. The insertion liquid tube is vertically installed at the other end of the liquid delivery arc tube and is sealed to the liquid delivery arc tube.

[0019] By adopting the above technical solution, at least two sets of outlet pipe seats are fixed on the inner side of the top ring shell, achieving multi-point cooling of the machining area. This avoids the uneven cooling problem caused by a single cooling point, effectively reducing the temperature of the tool and the workpiece, reducing tool thermal wear and workpiece thermal deformation, and ensuring machining accuracy and tool life. The vertical pipe is vertically fixed to the outlet pipe seats, the delivery arc pipe is sealed to the external supply pipe, and the insertion pipe is sealed to the vertical pipe and delivery arc pipe, forming a complete coolant delivery channel. This ensures the airtightness of the coolant delivery, preventing coolant leakage from contaminating the machining environment and affecting machining accuracy. A protective pipe protects the delivery arc pipe and the external supply pipe from damage. The external supply pipe connects to the external coolant circulation system and chiller, ensuring a constant coolant temperature and cleanliness. The integration of flow and pressure sensors allows for real-time monitoring of the coolant supply status, facilitating timely adjustments and ensuring stable cooling performance. Overall, this achieves precise, uniform, and stable cooling during the machining process, improving machining quality and efficiency.

[0020] Furthermore, a positioning sleeve is inserted into the lower end of the liquid outlet pipe seat, and the positioning sleeve is fixedly connected to the liquid outlet pipe seat by screws. A flow guide bend is also fixedly installed at the lower end of the positioning sleeve. One end of the flow guide bend is inserted into the tail of the matching vertical pipe, and several sets of liquid cooling pipes are fixedly installed on the side of the positioning sleeve. The other end of the liquid cooling pipe is sealed to the flow guide bend.

[0021] By adopting the above technical solution, the positioning sleeve at the lower end of the outlet pipe seat is fixed with screws, providing a stable mounting carrier for the guide bend and liquid cooling pipe, ensuring the installation stability of the cooling pipeline. The guide bend enables the diversion and delivery of coolant, smoothly conveying coolant from the matching vertical pipe to the liquid cooling pipe, avoiding turbulence and leakage during coolant delivery. Several sets of liquid cooling pipes are sealed to the guide bend, enabling multi-directional and precise spray cooling of the cutting point or tool, further improving the targeting and efficiency of cooling, and preventing localized overheating of the tool. The adjustable nozzle design allows for flexible adjustment of the coolant spray direction according to the type of machining tool and the machining position, adapting to different machining scenarios, maximizing the cooling effect, reducing tool wear and workpiece deformation, and ensuring the smoothness and sealing of coolant delivery by the precision structural design of the positioning sleeve and guide bend, further guaranteeing the stability and reliability of the cooling effect.

[0022] Furthermore, the transmission cutter shaft seat includes a main seat rod, a mating bearing, a linkage bracket, and a guide rod seat. The mating bearing is sleeved and fixed on the outer side of the main seat rod and is fixedly installed in the top ring seat. The upper end face of the main seat rod is provided with a positioning slot, and the lower end face of the main seat rod is provided with a cross groove for installing the guide rod seat. The linkage bracket is inserted and installed in the positioning slot, and the guide rod seat is fixedly installed at the lower end of the main seat rod.

[0023] By adopting the above technical solution, the main support rod is made of high-strength alloy steel through precision machining, and is equipped with a high-precision angular contact ball bearing assembly to ensure the radial and axial runout accuracy of the transmission tool shaft seat is within the micrometer level, avoiding shaking and offset during transmission and ensuring the accuracy of cutting. The bearing is fixedly installed in the top ring seat, providing stable support and smooth rotation conditions for the main support rod, reducing rotational resistance, improving transmission efficiency, and extending bearing life through precision lubrication. The positioning slot on the main support rod cooperates with the linkage bracket to achieve precise positioning and stable connection between the linkage bracket and the main support rod, ensuring that the torque of the spindle motor can be stably transmitted to the main support rod, driving its stable rotation. The cross slot cooperates with the guide rod seat to achieve precise installation of the guide rod seat and the main support rod, ensuring the installation accuracy of the guide rod seat and the tool, and comprehensively improving the rotational stability, transmission accuracy, and structural rigidity of the transmission tool shaft seat, providing a guarantee for efficient and precise cutting.

[0024] Furthermore, the linkage bracket includes a main frame rod, a connecting shaft seat, and a plug plate that mates with the positioning slot. The connecting shaft seat is fixedly installed at the head of the main frame rod and is fixedly connected to the output shaft of the main spindle motor. The plug plate is vertically fixed to the lower end face of the main frame rod. The guide rod seat includes a vertical rod part, a tool holder, and a cross top seat that mates with the cross groove. The cross top seat and the tool holder are respectively fixed at the upper and lower ends of the vertical rod part, and an annular disc is sleeved on the vertical rod part. The annular disc is fixed to the lower end face of the main support rod by screws.

[0025] By adopting the above technical solution, the connecting shaft seat of the linkage bracket is fixedly connected to the output shaft of the main spindle motor, and the plug plate cooperates with the positioning slot of the main support rod to ensure that the torque of the main spindle motor can be efficiently and accurately transmitted to the main support rod, avoiding slippage and loss during torque transmission. At the same time, the linkage bracket is precision machined from high-strength alloy steel to improve the rigidity and stability of torque transmission. The cross top seat of the guide rod seat cooperates with the cross groove of the main support rod to further improve the installation accuracy and connection firmness of the guide rod seat and the main support rod. The tool holder is designed with a standardized tool holder interface, which is compatible with a variety of commonly used cutting tools, improving the machining versatility of the machine tool, facilitating quick tool changes, and improving machining efficiency. The annular disc is fixed to the lower end face of the main support rod with high-strength screws to further strengthen the connection between the guide rod seat and the main support rod, prevent the guide rod seat from loosening during machining, ensure the stability of tool clamping and cutting accuracy, and improve the overall torque transmission efficiency, tool compatibility and machining stability of the transmission tool shaft seat.

[0026] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention significantly improves production efficiency through multi-spindle parallel machining. Each adjustable spindle seat assembly can be independently and precisely adjusted laterally on the vertical platform, and its clamping seat can be independently adjusted in height via a vertical electric cylinder. This multi-dimensional independent adjustability greatly enhances the machine tool's adaptability to workpieces of different sizes and shapes, as well as multi-process machining tasks, achieving a highly flexible production layout, significantly shortening the machining cycle, and improving the overall utilization rate of the machine tool. The smoke extraction pipe seat and cooling pipe assembly are integrated into the integrated housing and act directly on the machining area. This compact and efficient integrated environmental control solution can more effectively capture smoke and debris generated during cutting and precisely cool the tool and workpiece. This not only greatly improves the air quality in the machining area and protects the health of operators, but also significantly reduces the cutting temperature, effectively extends tool life, and improves machining accuracy and surface quality. All functional modules of the machine tool adopt a modular design. In particular, the design of the integrated housing's positioning ring seat, plug-in cover, top ring seat, and drive shaft seat makes the assembly, disassembly, replacement, and maintenance of components quick and convenient. This significantly reduces downtime, lowers operating costs, and improves the overall maintainability of the equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a perspective view of the overall structure in an embodiment of the present invention; Figure 2 yes Figure 1 A perspective view of the device shown without the base installed; Figure 3 This is a perspective view of the clamping seat, integrated housing, dust removal tube seat, cooling tube assembly, and transmission cutter shaft seat in an embodiment of the present invention. Figure 4 yes Figure 3 A front view of the device shown; Figure 5 yes Figure 3 A bottom view of the device shown; Figure 6 This is a perspective view of the clamping seat, liquid delivery arc tube, liquid insertion tube, bent insertion tube and external air tube in combination in an embodiment of the present invention; Figure 7 yes Figure 6 A bottom view of the device shown; Figure 8 This is a perspective view of the integrated housing, adsorption housing, top tube, liquid outlet pipe seat, and matching vertical pipe in an embodiment of the present invention. Figure 9 yes Figure 8 A stereoscopic view of the device shown from a second perspective; Figure 10 yes Figure 8 A front view of the device shown; Figure 11 This is a perspective view of the main support rod and the mating bearing in an embodiment of the present invention; Figure 12 yes Figure 11 A bottom view of the device shown; Figure 13 This is a perspective view of the linkage bracket in an embodiment of the present invention; Figure 14 This is the three-dimensional form of the guide rod seat in the embodiment of the present invention. Figure 1 ; Figure 15 This is the three-dimensional form of the guide rod seat in the embodiment of the present invention. Figure 2 ; Figure 16This is a perspective view of the positioning sleeve in an embodiment of the present invention; Figure 17 yes Figure 16 Front view of the device shown.

[0029] In the diagram: 1. Base; 11. Seat box; 111. Support foot; 112. Worktable; 12. Vertical platform; 121. Horizontal guide rail; 3. Adjustable spindle seat assembly; 31. Back plate seat; 311. Clamping slide; 312. Top motor; 313. Drive screw; 32. Integrated spindle seat; 321. Cylinder seat; 322. Guide frame; 4. Clamping seat; 40. Vertical electric cylinder; 41. Arc-shaped seat shell; 411. External plate; 42. Connecting ear strap; 43. Limiting seat block; 44. Protective tube; 441. External liquid supply tube; 5. Integrated housing; 51. Positioning ring seat; 510. Positioning groove; 511. Bottom ring part; 512. Top ring shell; 513. Light strip groove; 514. Connecting side hole; 52. Insertion cover; 521. Cover plate 522. Inner ring; 53. Top ring seat; 531. Movable frame; 6. Dust removal pipe seat; 61. Adsorption shell; 62. Top pipe section; 63. Bent insertion pipe; 64. External air pipe; 7. Cooling pipe assembly; 71. Liquid outlet pipe seat; 72. Matching vertical pipe; 73. Liquid delivery arc pipe; 74. Insertion liquid pipe; 75. Positioning sleeve; 751. Guide bend pipe; 752. Liquid cooling pipe; 8. Transmission tool shaft seat; 80. Main spindle motor; 81. Main seat rod; 811. Positioning slot; 812. Cross groove; 82. Matching bearing; 83. Linkage insert frame; 831. Main frame rod; 832. Connecting shaft seat; 833. Insertion plate; 84. Guide rod seat; 841. Vertical rod section; 842. Tool holder; 843. Cross top seat; 844. Annular disc. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. 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. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5This invention provides a multi-spindle machining center, including a base 1, which comprises a base box 11 and several sets of vertical supports 12. The vertical supports 12 are vertically fixed to the upper surface of the base box 11. An adjustable spindle support assembly 3 is slidably mounted on the front end face of the vertical supports 12, and a drive cylinder for driving the adjustable spindle support assembly 3 to move laterally is provided on the vertical supports 12. Several sets of clamping seats 4 are mounted on the front end of the adjustable spindle support assembly 3, and a vertical electric cylinder 40 for adjusting the height of the clamping seats 4 is also fixedly mounted on the adjustable spindle support assembly 3. An integrated housing 5 is sleeved and fixedly mounted in the clamping seats 4. A dust removal pipe seat 6 and a cooling pipe assembly 7 are fixedly mounted on the inner surface of the integrated housing 5, and a transmission tool spindle seat 8 is vertically mounted at the center of the integrated housing 5. A spindle motor 80 for driving the transmission tool spindle seat 8 to rotate is also fixedly mounted on the adjustable spindle support assembly 3. The drive electric cylinder can be a high-precision electric slide from companies like THK's KR series. The model can be selected based on actual stroke and load requirements, such as the KR33 or KR46 series. It features an integrated motor, ball screw, and guide rail, achieving a travel speed of 200mm / s and a positioning accuracy of + / -0.02mm. Its control method involves communication with the machine tool's main control PLC (such as Siemens S7-1500 series or Mitsubishi MELSEC iQ-R series), and position, speed, and acceleration control via a servo driver (such as the corresponding electric cylinder driver). The vertical electric cylinder 40 can be a high-precision electric cylinder from companies like IAI's RCS2 series. Its stroke depends on the adjustment range of the clamping seat 4, such as 100mm or 200mm, with a speed up to 150mm / s and a positioning accuracy of + / -0.01mm. It is also precisely controlled via a PLC. The spindle motor 80 is preferably a high-speed, high-torque FANUC αi-B series or Siemens 1PH8 series servo spindle motor, with a power range of 5kW to 15kW and a maximum speed of 12000RPM. Precise speed and torque control is achieved through a corresponding CNC controller (e.g., FANUC 0i-MF or Siemens 828D / 840D SL) to ensure stable high-speed rotation of the transmission tool spindle holder 8. Several sets of support feet 111 are fixedly mounted on the lower end face of the base box 11. These support feet 111 can be height-adjustable, shock-absorbing, and anti-slip, made of cast steel or stainless steel, with rubber pads on the bottom to provide stable support for the machine tool and reduce vibration. The upper end face of the base box 11 is equipped with a worktable 112 corresponding to the transmission tool spindle holder 8. The worktable 112 can be made of high-strength cast iron (e.g., HT300) or hardened steel, with a precision-ground and scraped surface to ensure high flatness and wear resistance. The seat 11 is also equipped with an internal electric cylinder that drives the worktable 112 to move back and forth. The internal electric cylinder can be an electric slide with a long stroke, such as the GL series of THK or the KK series of HIWIN. The stroke can be customized according to the workpiece size and processing requirements. Its control method is similar to that of the drive electric cylinder, and motion control is performed by PLC.The front end face of the vertical base 12 is fixedly mounted with a transverse guide rail 121 for sliding mounting of the adjustable shaft seat assembly 3. The transverse guide rail 121 is preferably a high-precision linear guide rail pair, such as the HGR series of HIWIN or the HSR series of THK. The guide rail accuracy grade is selected as P or SP to ensure the transverse movement accuracy of the adjustable shaft seat assembly 3.

[0032] Reference Figure 2 The adjustable spindle assembly 3 includes a backplate 31 and an integrated spindle seat 32. The rear end face of the backplate 31 is provided with a clamping slide 311 that mates with the transverse guide rail 121. The integrated spindle seat 32 is slidably mounted on the backplate 31, and a top motor 312 is fixedly mounted on the upper end of the backplate 31. The output end of the top motor 312 is connected to a drive screw 313 for adjusting the height of the integrated spindle seat 32, and the drive screw 313 is threadedly connected to the integrated spindle seat 32. The front end face of the integrated spindle seat 32 is also provided with a cylinder seat 321 for mounting the vertical electric cylinder 40. The top motor 312 can be a small, high-precision servo motor, such as the Panasonic MINAS A6 series or Yaskawa Sigma-7 series, with a power ranging from 0.2kW to 0.75kW, coupled with a high-reduction-ratio planetary gearbox to provide sufficient torque and precise rotation angle control. The drive screw 313 is preferably made of C5 or C3 grade precision ball screw, such as THK's BNK series or NSK's W series, to ensure that the vertical adjustment accuracy of the integrated spindle seat 32 reaches the micron level.

[0033] Reference Figure 6 and Figure 7 The clamping base 4 includes an arc-shaped housing 41, connecting ear straps 42, a limiting block 43, and a protective tube 44. Two sets of connecting ear straps 42 are provided, and each set is fixed to one end of the arc-shaped housing 41, and the two sets of connecting ear straps 42 are fixed together by bolts. An external plate 411, which connects to the output end of the vertical electric cylinder 40, is integrally formed on the outer surface of the arc-shaped housing 41. The limiting block 43 is fixedly installed on the inner surface of the arc-shaped housing 41, and the protective tube 44 is inclinedly disposed on the limiting block 43 and fixedly connected to the limiting block 43. The arc-shaped housing 41, connecting ear straps 42, and limiting block 43 can be precision machined from high-strength aluminum alloy (e.g., 7075-T6 or 6061-T6) or stainless steel (e.g., SUS304) to ensure structural rigidity and corrosion resistance. 10.9 grade high-strength alloy steel bolts are used. The protective tube 44 can be made of oil-resistant, wear-resistant, and high-temperature-resistant industrial-grade flexible hose or corrugated pipe, such as polyurethane or stainless steel, to protect the internal piping.

[0034] Reference Figure 8 , Figure 9 and Figure 10The integrated housing 5 includes a positioning ring seat 51, a plug-in cover 52, and a top ring seat 53 for mounting the dust removal pipe seat 6. The positioning ring seat 51 has a positioning groove 510 on its side for mounting the limiting seat block 43, ensuring precise positioning and quick installation of the clamping seat 4 and the integrated housing 5. The plug-in cover 52 is plugged into the positioning ring seat 51 and is fixedly connected to it. The top ring seat 53 is located at the center of the upper surface of the plug-in cover 52 and is integrally formed with it. A movable frame 531 is fixedly mounted on the outer surface of the top ring seat 53, and a guide frame 322 for sliding installation of the movable frame 531 is fixedly provided at the front end of the integrated spindle seat 32. The positioning ring seat 51, plug-in cover 52, top ring seat 53, movable frame 531, and guide frame 322 can be made of precision cast or CNC machined aerospace aluminum alloy (e.g., 7075-T6) or stainless steel, with anodized or passivated surfaces to improve wear resistance and corrosion resistance. The movable frame 531 and guide frame 322 can be fitted with precision linear sliders or guide columns to ensure the stability and synchronization of the integrated housing 5 when the vertical electric cylinder 40 adjusts its height, preventing wobbling. The positioning ring seat 51 includes a bottom ring portion 511 and a top ring shell 512. The top ring shell 512 is coaxially disposed on the upper end face of the bottom ring portion 511, and is integrally formed with the bottom ring portion 511. A light strip groove 513 is provided on the lower end face of the bottom ring portion 511, and a connecting side hole 514 communicating with the light strip groove 513 is provided on the side of the bottom ring portion 511. An industrial-grade LED light strip with IP67 protection rating can be installed in the light strip groove 513, providing clear illumination of the processing area for easy operator observation and maintenance. The plug-in cover 52 includes a cover plate 521 and an inner insert ring 522. The inner insert ring 522 is coaxially positioned on the lower end face of the cover plate 521 and is plugged into and fixed in the top ring shell 512. A sealing ring, such as a fluororubber O-ring, can be provided between the inner insert ring 522 and the top ring shell 512 to ensure internal sealing and prevent the ingress of cutting fluid or fumes.

[0035] Reference Figure 5 , Figure 6 , Figure 7 and Figure 8The dust removal pipe seat 6 includes an adsorption shell 61, a top pipe section 62, a bent insertion tube 63, and an external air pipe 64. The adsorption shell 61 is designed as a ring structure and is fixedly attached to the inner side of the top ring shell 512, which can capture dust from the processing area to the maximum extent. The top pipe section 62 is sealed and fixed to the upper end face of the adsorption shell 61. One end of the bent insertion tube 63 is fixedly installed on the inner side of the arc-shaped seat shell 41, and the other end of the bent insertion tube 63 is inserted into the top pipe section 62. The bent insertion tube 63 is made of wear-resistant, corrosion-resistant, and highly flexible industrial dust collection hose, such as polyurethane or PVC spiral reinforced hose with steel wire. The external air pipe 64 is set in the protective pipe 44 and is sealed and connected to the bent insertion tube 63. The external air duct 64 can be connected to an external industrial dust collector or central fume treatment system, such as a Siemens G-series side-flow fan with a negative pressure of -15kPa to -30kPa or a professional industrial dust collector (such as the Donaldson Torit DFE series), to discharge fumes through the duct. An airflow sensor (such as the Sensirion SFM3xxx series) can be integrated to monitor the adsorption effect in real time.

[0036] Reference Figure 6 , Figure 7 , Figure 9 , Figure 16 and Figure 17The cooling tube assembly 7 includes a liquid outlet seat 71, a matching vertical tube 72, a liquid delivery arc tube 73, and a connector liquid tube 74 connected to the head of the matching vertical tube 72. There are at least two sets of liquid outlet seats 71, which are fixedly installed on the inner side of the top ring shell 512 to achieve multi-point cooling. The matching vertical tube 72 is vertically fixed to the liquid outlet seat 71. The liquid delivery arc tube 73 is fixedly installed on the inner side of the arc-shaped seat shell 41, with one end extending into the protective tube 44. An external liquid supply tube 441, which is sealed and connected to the liquid delivery arc tube 73, is provided in the protective tube 44, supplying coolant from the outside to the internal piping. The connector liquid tube 74 is vertically installed at the other end of the liquid delivery arc tube 73, and is sealed and connected to the liquid delivery arc tube 73. The liquid outlet seat 71 can be made of brass or stainless steel. The riser 72, liquid delivery arc pipe 73, and insertion liquid pipe 74 can be made of pressure-resistant and corrosion-resistant industrial-grade high-pressure oil pipe or braided hose, such as PTFE or nitrile rubber hose, connected via quick-connect fittings or threaded fittings to ensure a tight seal. The external liquid supply pipe 441 can be connected to an external coolant pump (e.g., Grundfos MTR series high-pressure coolant pump or ordinary centrifugal pump) and coolant filtration / circulation system, and integrated with an industrial chiller (e.g., temperature control accuracy + / -1℃) to ensure constant coolant temperature and cleanliness. Flow sensors (e.g., ifmefector SM series) and pressure sensors (e.g., WIKA A-10 series) can be integrated to monitor the coolant supply status in real time. A positioning sleeve 75 is inserted and installed at the lower end of the outlet pipe seat 71, and the positioning sleeve 75 is fixedly connected to the outlet pipe seat 71 by screws. A guide bend 751 is fixedly installed at the lower end of the positioning sleeve 75. One end of the guide bend 751 is inserted into the tail of the mating vertical pipe 72, and several sets of liquid cooling pipes 752 are fixedly installed on the side of the positioning sleeve 75. The other end of the liquid cooling pipes 752 is sealed to the guide bend 751. The positioning sleeve 75 and the guide bend 751 can be precision cast or machined from brass or stainless steel. The liquid cooling pipes 752 can be small-diameter copper or stainless steel pipes and connected to adjustable-angle nozzles (such as the Loc-Line modular nozzle system) to achieve precise jet cooling of the cutting point or tool.

[0037] Reference Figure 11 , Figure 12 , Figure 13 , Figure 14 and Figure 15The transmission tool shaft seat 8 includes a main seat rod 81, a mating bearing 82, a linkage bracket 83, and a guide rod seat 84. The mating bearing 82 is sleeved and fixed on the outer surface of the main seat rod 81 and is fixedly installed in the top ring seat 53. The mating bearing 82 is a high-precision angular contact ball bearing assembly, such as high-speed spindle bearings from NSK, FAG, or SKF, pre-tightened to ensure the radial and axial runout accuracy of the transmission tool shaft seat 8 is within 3 micrometers, and is lubricated with precision grease or oil-air lubrication. A positioning slot 811 is provided on the upper end face of the main seat rod 81, and a cross groove 812 for installing the guide rod seat 84 is provided on the lower end face of the main seat rod 81. The linkage bracket 83 is inserted into the positioning slot 811, and the guide rod seat 84 is fixedly installed at the lower end of the main seat rod 81. The main seat rod 81 can be made of high-strength alloy steel (e.g., 40CrMo or SKD11) and subjected to quenching and tempering and precision grinding to ensure high rigidity and wear resistance. The linkage bracket 83 includes a main frame rod 831, a connecting shaft seat 832, and a plug-in plate 833 that mates with the positioning slot 811. The connecting shaft seat 832 is fixedly installed at the head of the main frame rod 831 and is fixedly connected to the output shaft of the spindle motor 80. The plug-in plate 833 is vertically fixed to the lower end face of the main frame rod 831. The linkage bracket 83 can be precision machined from high-strength alloy steel (such as 40CrNiMo) to ensure the rigidity and accuracy of torque transmission. The guide rod seat 84 includes a vertical rod portion 841, a tool holder 842, and a cross top seat 843 that mates with the cross groove 812. The cross top seat 843 and the tool holder 842 are respectively fixed to the upper and lower ends of the vertical rod portion 841, and an annular disk 844 is sleeved on the vertical rod portion 841. The annular disk 844 is fixed to the lower end face of the main seat rod 81 by screws. The guide rod seat 84 can be made of tool steel (e.g., H13 or D2) and precision ground after heat treatment to ensure the strength and accuracy of tool clamping. The tool holder 842 can be designed as a standardized tool holder interface, such as BT30 / BT40, CAT40, or HSK63, to be compatible with various commonly used cutting tools (such as end mills, drills, reamers, etc.). The annular disc 844 can be made of steel and fastened to the main seat rod 81 with high-strength screws (e.g., grade 12.9) to further increase the stability of the tool clamping system.

[0038] Working principle: The working principle of the multi-spindle machining center of this invention is mainly divided into the following stages. Preparing to clamp the workpiece: First, the workpiece to be processed is clamped on the worktable 112. Through the operation of the control system, the internal electric cylinder drives the worktable 112 to move back and forth on the housing 11, precisely feeding the workpiece into the expected processing area.

[0039] Spindle unit positioning and fine adjustment: According to the preset machining program or operator instructions, the control system sends commands to the drive cylinders on the vertical platform 12. The drive cylinders drive their respective adjustable spindle seats 3 to move laterally along the transverse guide rails 121 on the front end face of the vertical platform 12, positioning each independent machining spindle unit to a preset transverse position corresponding to the workpiece machining point.

[0040] Next, for each adjustable spindle assembly 3, the top motor 312 at the upper end of its backplate 31 is activated. Through the connected drive screw 313, it precisely drives the integrated spindle 32 to slide vertically on the backplate 31, thereby achieving a rough height adjustment of the entire integrated housing 5 and the transmission tool spindle 8. Following this, to achieve more precise tool height positioning, the vertical electric cylinder 40 on the adjustable spindle assembly 3 is activated. The vertical electric cylinder 40 drives its connected clamping seat 4 to make a small vertical movement, thereby driving the integrated housing 5 and its internal transmission tool spindle 8 to perform a fine height adjustment, ensuring a precise relative position between the tool and the workpiece. During this process, the movable frame 531 on the integrated housing 5 slides within the guide frame 322 of the integrated spindle 32, ensuring the stability and guidance of the integrated housing 5 during vertical adjustment and preventing wobbling.

[0041] Multi-spindle collaborative machining: Once all tools are precisely in position, the spindle motor 80 starts according to the machining program instructions. The output shaft of the spindle motor 80 transmits rotational power to the main support rod 81 of the transmission tool spindle holder 8 via the connecting bearing 832 and the linkage bracket 83. The main support rod 81 rotates at high speed with the support of the bearing 82 inside, thereby driving the cutting tool fixed on the tool holder 842 of the guide rod holder 84 to perform high-speed cutting. Due to the presence of multiple independently adjustable spindle units, the machine tool can simultaneously perform multi-process machining on different areas of a workpiece, or perform parallel machining on multiple workpieces, greatly improving production efficiency.

[0042] Integrated environmental control: During the cutting process, the dust removal tube seat 6 and the cooling tube assembly 7 inside the integrated housing 5 work synchronously. Under the negative pressure of the dust collection system (connected via an external air pipe 64), the annular adsorption shell 61 of the dust removal tube seat 6 directly forms a strong adsorption area around the cutting point of the tool, rapidly drawing in and expelling pollutants such as dust and metal chips generated during cutting through the top tube 62 and the bent insertion tube 63. This effectively purifies the air environment of the processing area, protects the health of the operator, and prevents pollutants from corroding the precision components inside the machine tool. The cooling tube assembly 7 obtains coolant from the external coolant circulation system through the external liquid supply pipe 441. The coolant passes through the liquid delivery arc pipe 73, the insertion liquid pipe 74, the liquid outlet seat 71, the matching vertical pipe 72, the positioning sleeve 75, and the guide bend 751, and finally, through several sets of liquid cooling pipes 752, precisely sprays the coolant onto the cutting edge of the tool and the surface of the workpiece. This effectively removes cutting heat, prevents tool overheating and wear, extends tool life, and avoids workpiece deformation due to heat, which could affect machining accuracy and surface quality. The protective tube 44 protects the external piping during this process from external damage or corrosion by the cutting fluid.

[0043] Processing completion and maintenance: After machining is completed, the spindle motor 80 stops running, and the tool retracts from the workpiece. The worktable 112 moves, making it convenient for the operator to remove the machined workpiece. If tool replacement or maintenance is required, the modular clamping base 4 and integrated housing 5 design, as well as the linkage bracket 83 and guide rod seat 84 in the transmission tool shaft seat 8, make the disassembly and reinstallation of components quick and convenient, significantly reducing downtime and improving equipment utilization and maintainability.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-spindle machining center, comprising a base (1), characterized in that: The base (1) includes a seat box (11) and several sets of vertical pedestals (12). The vertical pedestals (12) are vertically fixed to the upper end face of the seat box (11). An adjustable shaft seat assembly (3) is slidably mounted on the front end face of the vertical pedestal (12), and a drive electric cylinder is provided on the vertical pedestal (12) to drive the adjustable shaft seat assembly (3) to move laterally. Several sets of clamping seats (4) are mounted on the front end of the adjustable shaft seat assembly (3), and the adjustable shaft seat assembly (3) is... A vertical electric cylinder (40) for adjusting the height of the clamping seat (4) is also fixedly installed. An integrated housing (5) is sleeved and fixed in the clamping seat (4). A dust removal pipe seat (6) and a cooling pipe assembly (7) are fixedly installed on the inner side of the integrated housing (5). A transmission cutter shaft seat (8) is vertically installed at the center of the integrated housing (5). A main spindle motor (80) for driving the transmission cutter shaft seat (8) to rotate is also fixedly installed on the adjustable shaft seat assembly (3).

2. The multi-spindle machining center according to claim 1, characterized in that, The lower end face of the base (11) is fixedly equipped with several sets of support feet (111), and the upper end face of the base (11) is provided with a worktable (112) corresponding to the transmission tool shaft seat (8). The base (11) is also equipped with an internal electric cylinder that drives the worktable (112) to move back and forth. The front end face of the vertical base (12) is fixedly equipped with a transverse guide rail (121) for sliding installation of the adjustable shaft seat assembly (3). The adjustable shaft seat assembly (3) includes a back plate seat (31) and an integrated spindle seat (32). The rear end of the back plate seat (31) The surface is provided with a clamping slide (311) that cooperates with the transverse guide rail (121). The integrated spindle seat (32) is slidably mounted on the back plate seat (31), and a top motor (312) is fixedly mounted on the upper end of the back plate seat (31). The output end of the top motor (312) is connected to a drive screw (313) for adjusting the height of the integrated spindle seat (32). The drive screw (313) is threadedly connected to the integrated spindle seat (32). The front end face of the integrated spindle seat (32) is also provided with a cylinder seat (321) for mounting a vertical electric cylinder (40).

3. A multi-spindle machining center according to claim 1, characterized in that, The adjusting clamping seat (4) includes an arc-shaped seat shell (41), connecting ear straps (42), a limiting seat block (43), and a protective tube (44). The connecting ear straps (42) are configured in two sets, and the two sets of connecting ear straps (42) are respectively fixed at both ends of the arc-shaped seat shell (41). The two sets of connecting ear straps (42) are fixed together by bolts. An external plate (411) connected to the output end of the vertical electric cylinder (40) is integrally formed on the outer side of the arc-shaped seat shell (41). The limiting seat block (43) is fixedly installed on the outer side of the arc-shaped seat shell (41). The protective tube (44) is inclinedly arranged on the limiting seat block (43), and the protective tube (44) is fixedly connected to the limiting seat block (43).

4. A multi-spindle machining center according to claim 3, characterized in that, The integrated housing (5) includes a positioning ring seat (51), a plug-in cover (52), and a top ring seat (53) for installing the dust removal pipe seat (6). The positioning ring seat (51) has a positioning groove (510) on its side for installing the limiting seat block (43). The plug-in cover (52) is plugged into the positioning ring seat (51) and fixedly connected to the positioning ring seat (51). The top ring seat (53) is located at the center of the upper end face of the plug-in cover (52) and is integrally formed with the plug-in cover (52). A movable frame (531) is fixedly installed on the outer side of the top ring seat (53), and a guide frame (322) for sliding installation of the movable frame (531) is fixedly provided at the front end of the integrated spindle seat (32).

5. A multi-spindle machining center according to claim 4, characterized in that, The positioning ring seat (51) includes a bottom ring part (511) and a top ring shell (512). The top ring shell (512) is coaxially disposed on the upper end face of the bottom ring part (511), and the top ring shell (512) and the bottom ring part (511) are integrally formed. The lower end face of the bottom ring part (511) is provided with a light strip groove (513), and the side of the bottom ring part (511) is provided with a connecting side hole (514) that communicates with the light strip groove (513). The plug-in cover (52) includes a cover plate (521) and an inner insert ring (522). The inner insert ring (522) is coaxially disposed on the lower end face of the cover plate (521), and the inner insert ring (522) is inserted and fixed in the top ring shell (512).

6. A multi-spindle machining center according to claim 5, characterized in that, The dust removal tube seat (6) includes an adsorption shell (61), a top tube (62), a bent insertion tube (63), and an external air pipe (64). The adsorption shell (61) is configured as an annular structure and is fixedly attached to the inner side of the top ring shell (512). The top tube (62) is sealed and fixed to the upper end face of the adsorption shell (61). One end of the bent insertion tube (63) is fixedly installed on the inner side of the arc-shaped seat shell (41), and the other end of the bent insertion tube (63) is inserted into the top tube (62). The external air pipe (64) is set in the protective tube (44), and the external air pipe (64) is sealed and connected to the bent insertion tube (63).

7. A multi-spindle machining center according to claim 6, characterized in that, The cooling tube assembly (7) includes a liquid outlet seat (71), a matching vertical tube (72), a liquid delivery arc tube (73), and a plug-in liquid tube (74) connected to the head of the matching vertical tube (72). There are at least two sets of liquid outlet seats (71), and the liquid outlet seats (71) are fixedly installed on the inner side of the top ring shell (512). The matching vertical tube (72) is vertically fixed on the liquid outlet seat (71). The liquid delivery arc tube (73) is fixedly installed on the inner side of the arc-shaped seat shell (41), and one end of the liquid delivery arc tube (73) extends into the protective tube (44). The protective tube (44) is provided with an external liquid supply tube (441) that is sealed and connected to the liquid delivery arc tube (73). The plug-in liquid tube (74) is vertically installed at the other end of the liquid delivery arc tube (73), and the plug-in liquid tube (74) is sealed and connected to the liquid delivery arc tube (73).

8. A multi-spindle machining center according to claim 7, characterized in that, The lower end of the liquid outlet pipe seat (71) is fitted with a positioning sleeve (75), and the positioning sleeve (75) is fixedly connected to the liquid outlet pipe seat (71) by screws. The lower end of the positioning sleeve (75) is also fixedly fitted with a flow guide bend (751). One end of the flow guide bend (751) is fitted with the tail of the matching vertical pipe (72), and several sets of liquid cooling pipes (752) are fixedly installed on the side of the positioning sleeve (75). The other end of the liquid cooling pipes (752) is sealed to the flow guide bend (751).

9. A multi-spindle machining center according to claim 8, characterized in that, The transmission cutter shaft seat (8) includes a main seat rod (81), a mating bearing (82), a linkage bracket (83), and a guide rod seat (84). The mating bearing (82) is sleeved and fixed on the outer side of the main seat rod (81) and is fixedly installed in the top ring seat (53). The upper end face of the main seat rod (81) is provided with a positioning slot (811), and the lower end face of the main seat rod (81) is provided with a cross groove (812) for the guide rod seat (84) to be installed. The linkage bracket (83) is inserted and installed in the positioning slot (811), and the guide rod seat (84) is fixedly installed at the lower end of the main seat rod (81).

10. A multi-spindle machining center according to claim 9, characterized in that, The linkage bracket (83) includes a main frame rod (831), a connecting shaft seat (832), and a plug plate (833) that cooperates with the positioning slot (811). The connecting shaft seat (832) is fixedly installed at the head of the main frame rod (831) and is fixedly connected to the output shaft of the spindle motor (80). The plug plate (833) is vertically fixed on the lower end face of the main frame rod (831). The guide rod seat (84) includes a vertical rod part (841), a tool holder (842), and a cross top seat (843) that cooperates with the cross groove (812). The cross top seat (843) and the tool holder (842) are respectively fixed at the upper and lower ends of the vertical rod part (841), and an annular disc (844) is sleeved on the vertical rod part (841). The annular disc (844) is fixed to the lower end face of the main seat rod (81) by screws.

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