Spindle mounting structure for machining center

Abstract

The utility model discloses a main shaft installation structure of machining center, including the portal frame for installing the main shaft, the portal frame includes the vertical roof of both sides and is connected in two vertical roof top crossbeam, be provided with three or more than main shaft on the crossbeam, the layout of the X direction motor of screw rod subassembly's above -mentioned adjustment cooperation further cooperation crossbeam mounting groove upper wall's gap design, further let the wiring operation and installation maintenance of main shaft be easier, and the material use of crossbeam also reduces accordingly, further reduced cost.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, specifically to a spindle mounting structure for a machining center. Background Technology

[0002] Mobile phone frames, tablet casings, laptop casings, and components for some wearable devices are typically manufactured using machining centers. To improve efficiency, existing multi-station machining centers usually include multiple machining stations, using multiple spindles to process multiple workpieces simultaneously. Traditionally, when multiple spindles are mounted on a gantry, they are slidably mounted on a crossbeam via an X-axis base, forming multi-axis synchronous machining. However, with the increasing complexity of metal processing, independent multi-spindle machining is gradually emerging, making spindle installation and wiring increasingly complex. How to make multi-spindle installation and wiring on a gantry easier is a challenge currently faced by technicians. Current methods often employ relatively mechanical winding and wiring, resulting in messy spindle wiring that is difficult to manage, and necessitating the expansion and widening of the gantry, increasing manufacturing costs. Utility Model Content

[0003] This utility model provides a spindle mounting structure for a machining center to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The spindle mounting structure of the machining center includes a gantry for mounting the spindle. The gantry includes vertical beams on both sides and a crossbeam connected to the top of the two vertical beams. Three or more spindles are mounted on the crossbeam.

[0006] Preferably, the number of main shafts on the crossbeam is three, arranged sequentially from left to right. Each main shaft is driven to move upward along the crossbeam by an independent first X-axis motor, a second X-axis motor, and a third X-axis motor, respectively equipped with a first lead screw assembly, a second lead screw assembly, and a third lead screw assembly. The first X-axis motor and the third X-axis motor are located at opposite ends of the front side of the crossbeam and are at roughly the same horizontal height. The second X-axis motor is located on the same end side of the crossbeam as the first X-axis motor or the third X-axis motor, and the second X-axis motor is located above the first X-axis motor or the third X-axis motor. Alternatively, the second X-axis motor may be positioned further in the X-direction than the first or third X-axis motor to leave a tail gap so that the wiring of the first or third X-axis motor below can be led out upwards; or the second X-axis motor may be located on the same end side of the crossbeam as the first or third X-axis motor, with the second X-axis motor positioned below the first or third X-axis motor, and the first or third X-axis motor may be positioned further in the X-direction than the second X-axis motor to leave a tail gap so that the wiring of the second X-axis motor below can be led out upwards.

[0007] Preferably, the second lead screw assembly includes a second lead screw, one end of which is connected to a second X-axis motor, and the other end of which is connected to a lead screw mounting seat mounted on a crossbeam. A lead screw nut seat is provided on the second lead screw. A stop block is provided on the crossbeam on the side of the lead screw mounting seat near the second X-axis motor. The stop block and the lead screw mounting seat together form a limiting mechanism. The distance between the stop block and the lead screw mounting seat is equivalent to the length of the lead screw in the first or third lead screw assembly. The limiting mechanism is centrally located in the X-direction of the crossbeam. The lead screw nut seat on the second lead screw moves between the stop block and the lead screw mounting seat to limit the range of movement of the intermediate spindle in the X-direction at the center of the crossbeam.

[0008] Preferably, the stop block is an n-shaped baffle with a central hollow, the n-shaped baffle is fixed on the crossbeam and the second lead screw passes through the central hollow of the n-shaped baffle.

[0009] Preferably, the crossbeam is provided with a mounting groove that is recessed backward along the Y direction. The mounting groove extends laterally along the crossbeam, and the first X-axis motor, the second X-axis motor, the third X-axis motor, the first lead screw assembly, the second lead screw assembly, and the third lead screw assembly are all located in the mounting groove. The upper wall of the mounting groove has a notch at the tail position of the upper X-axis motor among the first X-axis motor, the second X-axis motor, and the third X-axis motor, so that the wires of the upper X-axis motor among the first X-axis motor, the second X-axis motor, and the third X-axis motor can be led out upward through the notch.

[0010] Preferably, four main shafts are arranged sequentially along the X-direction on the crossbeam. Each main shaft is driven to move along the crossbeam in the X-direction by an independent first X-direction motor, a second X-direction motor, a third X-direction motor, and a fourth X-direction motor, respectively equipped with a first lead screw assembly, a second lead screw assembly, a third lead screw assembly, and a fourth lead screw assembly. The first X-direction motor and the fourth X-direction motor are located at opposite ends of the front side of the crossbeam and are at roughly the same height. The first X-direction motor and the second X-direction motor are located on the same end side of the crossbeam, with the second X-direction motor located above the first X-direction motor. The third X-direction motor and the fourth X-direction motor are located on the same end side of the crossbeam, with the third X-direction motor located above the fourth X-direction motor. The second X-direction motor is positioned further inward in the X-direction direction than the first X-direction motor to leave a tail gap so that the wire of the first X-direction motor below can be led out upward. The third X-direction motor is positioned further inward in the X-direction direction than the fourth X-direction motor to leave a tail gap so that the wire of the fourth X-direction motor below can be led out upward.

[0011] Preferably, the two middle main shafts are respectively connected to the lead screw nut seats of the second and third lead screw assemblies, and the two main shafts on both sides are respectively connected to the lead screw nut seats of the first and fourth lead screw assemblies; the lead screw lengths of the second and third lead screw assemblies are greater than the lead screw lengths of the first and fourth lead screw assemblies; two limiting mechanisms are provided on the crossbeam, corresponding to the lead screw nut seats on the second and third lead screw assemblies respectively. The limiting mechanism includes a lead screw mounting seat installed on the crossbeam and a stop block offset from the lead screw mounting seat in the X direction. The lead screw nut seats of the second and third lead screw assemblies are respectively disposed between the lead screw mounting seats and the stop blocks of the two limiting mechanisms. The lead screw nut seats move between the lead screw mounting seats and the stop blocks of the limiting mechanisms to limit the range of movement of the main shafts connected to the lead screw nut seats in the X direction.

[0012] Preferably, the crossbeam is provided with a mounting groove that is recessed backward along the Y direction. The mounting groove extends laterally along the crossbeam. The first X-axis motor, the second X-axis motor, the third X-axis motor, the fourth X-axis motor, the first lead screw assembly, the second lead screw assembly, the third lead screw assembly, and the fourth lead screw assembly are all located in the mounting groove. The upper wall of the mounting groove has a notch at the tail position corresponding to the second X-axis motor and the third X-axis motor, so that the wires of the second X-axis motor and the third X-axis motor can be led out upward through the notch.

[0013] Preferably, the crossbeam is provided with a mounting groove that is recessed backward along the Y direction. The mounting groove extends laterally along the crossbeam. An X-axis motor and a lead screw assembly are installed in the mounting groove. The X-axis motor drives the lead screw assembly to drive the main shaft to move along the X direction. A notch is left at the position of the upper X-axis motor tail on the upper wall of the mounting groove so that the wire of the X-axis motor can be led out upward through the notch.

[0014] Preferably, a pair of guide rails extending integrally in the X direction are provided on the front side of the mounting groove along the Y direction on both sides, and the main shaft located on the crossbeam is slidably mounted on the pair of guide rails through the X-direction slide block.

[0015] In this invention, the aforementioned adjustment of the lead screw assembly, combined with the layout of the X-axis motor and the notch design on the upper wall of the crossbeam mounting groove, further facilitates the wiring operation and installation and maintenance of the spindle, and also reduces the amount of material used in the crossbeam, thereby further reducing costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a view from another perspective of the present invention;

[0018] Figure 3 This is an installation diagram of the present invention;

[0019] Figure 4 for Figure 3 Schematic diagram of the central cutting tool assembly;

[0020] Figure 5 This is a structural schematic diagram of the gantry frame of this utility model.

[0021] The components are as follows: 10. Bed; 11. First rail; 111. First guide rail; 112. First slider; 113. Mounting boss; 12. Gantry frame; 121. Vertical beam; 122. Horizontal beam; 1221. Mounting slot; 1222. Notch; 123. Mounting window; 131. Guide rail; 14. Base; 20. Worktable; 30. Spindle; 31. X-axis slide; 40. Tool transport assembly; 41. Movable seat; 410. Horizontal beam; 411. Tool storage section; 4111. Tool setter; 4112. Tool changer; 4113. Tool returner; 4114. Spare tool holder; 41141. Support column; 41142. Top cover; 4115. Clamping seat; 4116. Sensor; 412. Support arm; 413. Support frame; 4131. Support rod; 4132. Connecting plate. ; 421, Second guide rail; 422, Second slider; 423, Support platform; 43, Second motor; 44, Transmission rod; 45, Transmission assembly; 451, Drive sprocket; 452, Driven sprocket; 453, Transmission chain; 454, Connecting block; 50, Tool magazine; 51, First layer support; 511, Tool storage plate; 52, Second layer support; 53, Vertical support; 54, Tool retrieval robot; 60, First drive mechanism; 61, First motor; 62, First transmission screw; 63, First screw nut; 811, First X-axis motor; 812, First screw assembly; 821, Second X-axis motor; 822, Second screw assembly; 823, Screw nut seat; 824, Screw mounting seat; 825, Stop block; 831, Third X-axis motor; 832, Third screw assembly.

[0022] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] This utility model embodiment provides a machining center, including a spindle mounting structure, combined with... Figures 1 to 5As shown, the machining center includes a bed 10, three worktables 20, three spindles 30, a tool magazine 50, and a tool transport assembly 40. The bed 10 serves as the mounting base for the entire machining center. Three first tracks 11 are arranged along the X-axis and extend along the Y-axis on the bed 10. The three worktables 20 are slidably mounted on the three first tracks 11, and each worktable 20 is driven by a first drive mechanism 60. Under the drive of the first drive mechanism 60, the worktable 20 slides along its matching first track 11. A gantry frame 12 is mounted on the bed 10, and the three spindles 30 are mounted on the gantry frame 12. The tool transport assembly 40 includes a movable seat 41, a second track, and a second drive mechanism. The second drive mechanism drives the movable seat 41 to move along the second track, which extends in the Y direction. The movable seat 41 is slidably mounted on the second track, and the second track is offset from the first track 11 by a certain distance in the X direction, so that the first drive mechanism 60 and the second drive mechanism can also be offset by a certain distance in the X direction. The movable seat 41 is provided with three tool storage sections 411, which are arranged in the X direction and connected to the three spindles 3 respectively. In a one-to-one correspondence, the second drive mechanism drives the movable seat 41 to move along the second track, so that the tool storage part 411 on the movable seat 41 moves between the spindle 30 and the tool magazine 50. When the spindle 30 needs to change tools, the tools on the tool magazine 50 are transferred to the tool storage part 411 on the movable seat 41. The movable seat 41 moves to a position close to the spindle 30, the tools on the spindle 30 are replaced, and the new tools on the movable seat 41 are replaced on the spindle 30. Then the movable seat 41 moves to a position close to the tool magazine 50, and the tools replaced by the spindle 30 are stored in the tool magazine 50.

[0027] In this invention, the movable seat 41 of the tool-carrying assembly 40 is mounted on the bed 10 via a second track, which is used to slide the worktable 20 onto the first track 11 on the bed 10. The first track is set to be offset from the second track, thereby making the second drive mechanism and the first drive mechanism offset from each other on the bed. The second drive mechanism will not encroach on the installation space of the first drive mechanism 60 on the bed. In other words, the space under the worktable 20 can be occupied by the first drive mechanism 60 alone, which allows for the configuration of a larger size and output power first drive mechanism 60 for the worktable 20. The larger space also facilitates the installation and maintenance of the first drive mechanism 60.

[0028] A pair of mounting bosses 113 corresponding to the worktable 20 are provided on the bed 10 below the worktable 20. The two mounting bosses 113 are set at a certain distance apart in the X direction. The first track 11 includes two first guide rails 111 and two first sliders 112. The two first guide rails 111 are respectively fixed to the top surface of the two mounting bosses 113, so that the two first guide rails 111 are staggered by a certain distance. The distance between the two first guide rails 111 is reasonably set according to the width of the worktable 20, as long as the distance between their opposite sides is less than or equal to the width of the worktable 20. Two first sliders 112 are slidably mounted on two first guide rails 111 respectively. The bottom sides of the worktable 20 are fixed on the two first sliders 112 respectively. The worktable 20, the two mounting bosses 113, and the bed 10 together form a receiving space, in which the aforementioned first drive mechanism 60 is placed. The worktable 20, the two mounting bosses 113, and the bed 10 together form a receiving space extending along the Y direction, which serves to protect the first drive mechanism 60. The interior of this receiving space is only used to install the first drive mechanism 60, which facilitates the configuration of a larger-sized first drive mechanism 60. The second track includes two second guide rails 421 fixed to the bed 10 and two second sliders 422 slidably mounted on the two second guide rails 421. The two second guide rails 421 are located on both sides of the bed 10 laterally, that is, the two second guide rails 421 are offset by a large distance in the X direction. In this way, the second track is offset from the first track 11 in the X direction. The movable seat 41 is arranged across the bed 10 in the X direction, and the two ends of the movable seat 41 are respectively connected to the two second sliders 422. The second drive mechanism is located away from the aforementioned receiving space and is arranged on both sides of the bed 10 in the X direction. Compared to existing technologies where both the first and second drive mechanisms are crammed into the receiving space formed by the two mounting bosses on the bed, leading to mutual interference between the first and second drive mechanisms and inability to adapt to high-power motors, or where the first drive mechanism is placed on the bed while the second drive mechanism is placed on the gantry, resulting in spatial complexity and interference with tool movement, this utility model separates the first and second drive mechanisms on the bed and places the second drive mechanism on both sides of the bed. This results in a more reasonable spatial layout, a more reliable structural design, and is more conducive to the arrangement, installation, and maintenance of the second drive mechanism.

[0029] The first drive mechanism 60 specifically includes a first motor 61, a first transmission screw 62, and a first screw nut 63. The length direction of the first motor 61 is consistent with the Y direction, and similarly, the extension direction of the first transmission screw 62 is also consistent with the Y direction, so as to better place the first motor 61 and the first transmission screw 62 inside the receiving space. One end of the first transmission screw 62 is connected to the output end of the first motor 61, and the first motor 61 drives the first transmission screw 62 to rotate. The first screw nut 63 is sleeved on the first transmission screw 62, and the first screw nut 63 is fixedly connected to the bottom surface of the worktable 20. The width of the receiving space is W and the height is [missing information]. H, H / W is 0.8 to 1, that is, the cross-sectional shape of the receiving space is a rectangle with a width W slightly greater than the height H, or a square with a width W equal to the height H. The height of the first motor 61 is D, where D / H is 0.9 to 1, that is, the height D of the first motor 61 is close to or equal to the height H of the receiving space so that the first motor 61 can be installed in the receiving space. The cross-section of a conventional motor is usually square or circular. Therefore, the height D of the first motor 61 is set to be close to or equal to the height H of the receiving space so as to make full use of the receiving space to install the first drive mechanism 60.

[0030] To ensure that the height H of the receiving space meets the installation requirements of the first drive mechanism 60, the height of the mounting boss 113 on the bed 10 is set to an appropriate size, and the distance between the two mounting bosses 113 under the same worktable 20 is greater than the width of the first motor 61. The mounting boss 113 can be formed by protruding from the upper surface of the bed 10, or it can be formed by recessing downwards into the upper surface of the bed 10 to form a groove, with one of the aforementioned mounting bosses 113 formed on each side of the groove.

[0031] The second drive mechanism corresponding to the movable seat 41 includes a second motor 43 and a transmission assembly 45. The output shaft of the second motor 43 connects to the two transmission assemblies 45, causing the transmission assemblies 45 to reciprocate along the Y direction. The transmission assemblies 45 are best installed on opposite sides of the two second guide rails 421, specifically in the space between the two second guide rails. Installing them close to the second guide rails, especially directly on the side surface where the second guide rails are located, saves space and avoids interference with other components. In another embodiment, the transmission assembly can be installed on the bed frame. Driven by the second motor 43, the transmission assembly 45 drives the second sliders 422 on the two second guide rails 421 to reciprocate along the Y direction, thereby causing the two ends of the movable seat 41 to reciprocate synchronously along the Y direction. To ensure smoother transmission, the second drive mechanism includes two transmission components 45 and a transmission rod 44. The transmission rod 44 extends along the X direction, and a transmission component 45 is arranged at each end of the transmission rod 44. The two transmission components 45 are synchronously connected by the transmission rod 44. The two transmission components 45 are respectively installed on opposite sides of the two second guide rails 421. The transmission rod 44 distributes the power output by the second motor 43 evenly to the two transmission components 45. The two transmission components 45 synchronously drive the two ends of the movable seat 41 to move along the two second guide rails 421, ensuring that the movable seat 41 can move smoothly in the Y direction, so that the tool transport component 40 can smoothly transfer the tool between the spindle 30 and the tool magazine 50.

[0032] The transmission assembly 45 is a chain drive mechanism, specifically including a drive sprocket 451, a driven sprocket 452, and a transmission chain 453. The two transmission assemblies 45 are respectively placed on opposite sides of the two second guide rails 421. The drive sprocket 451 and the driven sprocket 452 are respectively pivotally connected to the two ends of the second guide rails 421. The drive sprockets 451 of the two transmission assemblies 45 are respectively connected to the two ends of the transmission rod 44. The transmission chain 453 is wound around the outside of the drive sprocket 451 and the driven sprocket 452, synchronously connecting the drive sprocket 451 and the driven sprocket 452. The two ends of the movable seat 41 are respectively fixed with a downwardly extending support arm 412. The lower ends of the two support arms 412 are respectively fixed with a connecting block 454. The two connecting blocks 454 are respectively fixed to the two second sliders 422 by bolts. At the same time, the two connecting blocks 454 are respectively connected to the two transmission chains 453. The transmission assembly 45 employs a chain drive mechanism, resulting in a relatively small size in the X-direction. When installing the transmission assembly 45 inside the second guide rail 421, only a small gap needs to be reserved between the second guide rail 421 and the outermost first guide rail 111 to accommodate the installation of the transmission assembly 45. This is achieved through the cooperation of a transmission rod with the two transmission assemblies, particularly through a transmission chain structure, such as... Figure 4Essentially, a U-shaped structure is inserted under the gantry of the bed, creating a large open space in the middle. The drive mechanism is located on both sides of the bed, resulting in more stable power output and a structural design that facilitates installation and maintenance of the drive mechanism on both sides of the bed. In other embodiments, the transmission component 45 is not limited to the chain drive mechanism described above; it can also be a screw drive mechanism, belt drive mechanism, etc.

[0033] The movable seat 41 of the tool transport assembly 40 is arranged across the three first rails 11 on the bed 10, so that the second guide rails 421 that cooperate with the two ends of the movable seat 41 are located on both sides of the three first rails 11. In this way, the two second guide rails 421 are located on both sides of the bed 10. The movable seat 41 has a large span, which will affect its own rigidity. This will result in the low accuracy of the tool storage part 411 located in the middle of the length direction of the movable seat 41. This is also the reason why tool changing assemblies with a large span are not used in the prior art. To address this, the present invention provides a downwardly extending support frame 413 fixed at the middle of the movable seat 41 along its length. The bottom of the support frame 413 is slidably mounted on the first track 11 located in the middle position. The support frame 413 provides support for the middle of the movable seat 41 along its length. At the same time, the support frame 413 shares the first track 11 with the worktable 20 located in the middle. In other words, the first track 11 in the middle provides common track support for the middle worktable 20 and the support frame 413. While ensuring that the tool-carrying assembly 40 has high precision, the structure of the machining center is simplified, forming a special structure with middle support and two-sided drive. The support frame 413 cooperates with the first track 11 without affecting the normal movement of the worktable 20, nor does it encroach on the installation space of the first drive mechanism 60 used to drive the movement of the worktable 20.

[0034] In some embodiments, the machining center of this invention includes four worktables 20, with the middle position of the movable seat 41 corresponding to the two adjacent middle first tracks 11. In this case, the support frame 413 can be slidably mounted on the two adjacent first guide rails 111 of the two middle first tracks 11. That is, when the machining center contains an odd number of worktables 20, the bottom of the support frame 413 is slidably mounted on the two first guide rails 111 of the middle first track 11; when the machining center contains an even number of worktables 20, the bottom of the support frame 413 is slidably mounted on the two middle first tracks 111. On the two adjacent first guide rails 111 of 11, it should be noted that if there is one or two worktables 20 and the size of the worktables 20 is relatively small, the movable seat 41 has a relatively small span size, and its own rigidity can ensure the accuracy of the tool storage part 411, then there is no need to configure a support frame 413. When there are many worktables 20 and the size is large, multiple support frames 413 can be set on the movable seat 41. These multiple support frames 413 slide with multiple first rails 11, or a support frame 413 can be set on the movable seat 41 that slides with multiple first rails 11 at the same time. For ease of assembly, this utility model also includes two support platforms 423 extending along the X-direction and assembled onto the bed 10. These two support platforms 423 respectively provide support for the two second guide rails 421, fixing the second guide rails 421 to the top surface of the support platforms 423. A transmission rod 44 is positioned between the two support platforms 423, with both ends of the transmission rod 44 pivotally connected to the opposite inner sides of the two support platforms 423. Simultaneously, the support platforms 423 are located below the second guide rails 421, providing a mounting base for the transmission assembly 45. Specifically, the driving sprocket 451 and driven sprocket 452 of the transmission assembly 45 are both pivotally connected to the inner surface of the support platform 423, and the transmission chain 453 is located on the support platform 423. On the inside, during assembly, the two support platforms 423 are integrated with the second drive mechanism and then the two support platforms 423 are fastened to both sides of the bed 10 with bolts. That is, the two support platforms 423, the second track, and the second drive mechanism can be installed together to form a component first, and then the component can be installed on the machine tool 10 as a whole. This facilitates the assembly of the tool transport component 40 and the bed 10. The second motor 43 is installed on the outside of one of the support platforms 423 to avoid the second motor 43 and the first drive mechanism 60 from coinciding in the X direction. When maintaining the machining center, sufficient maintenance space is reserved between the two support platforms 423 to facilitate the maintenance of the first drive mechanism 60.

[0035] A base platform 14 is provided on each side of the bed 10. The width of the base platform 14 is greater than the width of the root of the gantry frame 12. The root of the gantry frame 12 is positioned close to the outer side of the base platform 14, so that the outer side of the root of the gantry frame 12 is as close as possible to or flush with the outer side of the base platform 14. Thus, a mounting surface is reserved on the inner side of the top surface of the base platform 14. The support platform 423 is placed on the mounting surface of the base platform 14 and fixed to the base platform 14 with bolts. Since the support platform 423 is fixed to the upper part of the base platform 14, the second motor 43 connected to the outer side of one of the support platforms 423 is located on the rear side of the root of the gantry frame 12. The second motor 43 is not obstructed above, outside, or behind, which facilitates the inspection and maintenance of the second motor 43 and makes the spatial layout more reasonable. In other embodiments, the support platform 423 can be fixed to the inner side of the root of the gantry frame 12. For example, the support platform 423 can be fixed to the gantry frame 12 by bolts that pass laterally through the root of the gantry frame 12 and the support platform 423. In other embodiments, the transmission assembly 45 can be installed on the outer side of the second guide rail 421, or on the outer side of the outermost first guide rail 111, or directly installed on the bed 10. The two ends of the aforementioned transmission rod 44 can be pivotally connected to the two second guide rails 421 or the two support platforms 423 respectively. After the body of the second motor 43 is fixed to one of the support platforms 423, the output shaft of the second motor 43 is connected to one end of the transmission rod 44. In other embodiments, the body of the second motor 43 can be mounted on the bed 10 so that the second motor 43 is approximately located in the middle of the transmission rod 44 along its length. The output shaft of the second motor 43 is connected to the middle of the transmission rod 44 through transmission components such as gears, transmission chains, and belts to drive the transmission rod 44 to rotate. In this way, the second motor 43 will not protrude from the side of the bed 10, thereby reducing the external size of the machining center and making the transmission force more balanced.

[0036] The tool magazine 50 includes a tool magazine bracket, which includes two vertical brackets 53 located on both sides of the bracket and a first-layer bracket 51 and a second-layer bracket 52 connected between the two vertical brackets 53. The first-layer bracket 51 and the second-layer bracket 52 are stacked, with the second-layer bracket 52 positioned above the first-layer bracket 51. A tool storage plate 511 is detachably mounted on the upper shell of the first-layer bracket 51. The tool storage plate 511 has multiple tool storage slots arranged in a matrix to allow multiple tools to be arranged in a matrix on the tool storage plate 511. A tool retrieval robot 54 capable of moving in the XYZ direction is mounted on the second-layer bracket 52. The tool retrieval robot 54 can retrieve and place tools on the tool storage plate 511. The height of the first-layer bracket 51 is... The height of the second layer support 52 is similar to that of the movable seat 41, so that the tool on the tool storage plate 511 and the tool storage part 411 on the movable seat 41 are at the same height or almost at the same height. The width of the second layer support 52 along the Y direction is greater than that of the first layer support 51 along the Y direction. Within the Z direction projection range of the second layer support 52, the first layer support 51 is installed at the rear layer of the bed in the Y direction, so that a space can be reserved on the Y-front side of the first layer support 51 for the movable seat 41 to stop. The tool retrieval robot 54 can pick up and place the tool on the tool storage plate 511 of the first layer support 51 to the tool storage part 411 of the movable seat 41, or pick up and place the tool on the tool storage part 411 of the movable seat 41 to the tool storage plate 511. Because the first layer support 51 and the second layer support 52 are positioned rearward in the Y direction, space is reserved at the front of the first layer support 51 in the Y direction below the tool-retrieving robot 54. When the movable seat 41 moves to the rearmost position in the Y direction, the second layer support 52 is positioned above the connection between the movable seat 41 and the first layer support 51. When the tool-retrieving robot 54 reciprocates between the first layer support 51 and the movable seat 41 to pick up and place tools, the displacement of the tool-retrieving robot 54 is small, which reduces the time required for the tool-retrieving robot 54 to pick up and place tools between the first layer support 51 and the movable seat 41, thereby improving the tool changing efficiency of the machining center.

[0037] The aforementioned gantry 12 includes two vertical beams 121 located on either side of it, and a crossbeam 122 connecting the tops of the two vertical beams 121. The bottom of the vertical beams 121 is located on the base 14 of the bed 10. The Y-direction width of the vertical beams 121 is smaller than the Y-direction width of the base 14. A space is reserved on the upper surface of the base 14 behind the vertical beams 121. The vertical support 53 of the tool magazine bracket is placed on the base 14 and located in this space, thus positioning the tool magazine 50 on the rear side of the gantry 12. To facilitate fixing the gantry 12 to the machine body 10, a mounting window 123 extending in the Y-direction is provided on the vertical beams 121. The mounting window 123 should be located as close as possible to the bottom of the vertical beams 121. A connecting bolt extends through the mounting window 123, passes through the portion of the vertical beam 121 below the mounting window 123, and is screwed onto the base 14, thereby fixing the gantry 12 to the bed 10. The vertical support 53 of the tool magazine 50 is positioned as close as possible to the inside of the base 14, that is, the vertical support 53 is positioned as close as possible to the second track, so that the vertical support 53 avoids the mounting window 123 on the vertical beam 121. When the gantry 12 needs to be disassembled, there is no need to remove the tool magazine 50 from the bed 10, which facilitates the maintenance and repair of the machining center.

[0038] The tool storage section 411 on the movable base 41 includes a tool changer 4112, a tool returnr 4113, and a tool reserver 4114. The tool changer 4112 is used to store new tools, the tool returnr 4113 is used to store old tools, and the tool reserver 4114 is used to store non-standard tools with structures different from those stored in the tool magazine 50. Non-standard tools are used for special machining of workpieces. In this invention, the storage of non-standard tools is not located in the tool magazine, but is located on the movable base of the tool transport assembly. This produces unexpected results, meeting various machining needs while making full use of the space of the tool transport assembly without disrupting the original matrix layout of the tool magazine. The tool changer 4112 and the tool returnr 4113 are arranged adjacent to each other along the X-direction, and they share a clamping seat 4115 located between them. The spare tool seat 4114 is located to the side of the tool changer 4112 and the tool returnr 4113 along the X-direction, and the spare tool seat 4114 has a tool-holding opening opposite to the tool changer 4112 and the tool returnr 4113. A tool setting device 4111 is also provided on the movable seat 41. The tool setting device 4111 is located to the other side of the tool changer 4112 and the tool returnr 4113 relative to the spare tool seat 4114, so that the tool setting device 4111, the tool changer 4112, the tool returnr 4113, and the spare tool seat 4114 are arranged sequentially along the X-direction on the movable seat 41.

[0039] The movable seat 41 includes a transverse beam 410 spanning the bed. The two ends of the transverse beam 410 are connected to the connecting block 454 via support arms 412. The connecting block 454 is connected to the second slider 422 on the second guide rail 421. The tool storage part 411 is disposed on the transverse beam 410 and is correspondingly disposed to the spindle 30. The tool changer 4112 and the tool returnr 4113 of the tool storage part 411 can be formed by three support seats arranged along the X direction. The three support seats can have the same structure and can be regarded as three of the above-mentioned clamping seats 4115 arranged sequentially along the X direction on the transverse beam 410. The middle clamping seat 4115 is shared by the tool changer 4112 and the tool returnr 4113. The two adjacent clamping seats 4115 constitute the tool changer 4112 and the tool returnr 4113. The tool holder 4114 includes two opposing support columns 41141 along the Y-direction and a top cover 41142 connected between the tops of the two support columns 41141. The two support columns 41141 are fixed to the front and rear sides of the horizontal beam 410, respectively. The top cover 41142 has an opening facing outward in the X-direction to form a tool-holding opening. Three support seats corresponding to the tool changer 4112 and the tool returnr 4113 are arranged along the X-direction, with a certain distance between adjacent support seats to form a gap. A sensor 4116 is installed in each of the two gaps formed by the three support seats. The sensor 4116 detects the tool to determine whether there is a tool in the tool changer 4112 and the tool returnr 4113 and whether the tool is correctly placed on the tool changer 4112 and the tool returnr 4113. The above structural design of the movable seat allows the tool changer, the tool returnr, and other components to be easily integrated into the same movable seat, simplifying the structure and making the spatial layout more reasonable, thus better meeting the design requirements of the tool holder.

[0040] Two support rods 4131 are provided at the middle position of the transverse beam 410 along its length. The bottom of the two support rods 4131 is connected by a connecting plate 4132. The bottom of the connecting plate 4132 is slidably assembled with the first track 11 located below it. That is to say, the support frame 413 is formed by the two support rods 4131 and the connecting plate 4132 to provide support for the middle position of the movable seat 41 along its length. This ensures that the movable seat 41 can move in the Y direction while sharing the first track 11 with the worktable 20 located in the middle position. The first track 11, the connecting plate 4132, and the two support rods 4131 provide support for the middle position of the transverse beam 410 in the Z direction, avoiding bending deformation of the middle part of the transverse beam 410 due to its excessive length. The force is more balanced, the structural design is more reasonable, and it is conducive to reducing costs.

[0041] The aforementioned gantry frame 12 is mainly used for mounting the spindle 30. In this utility model, two or more spindles 30 can be mounted on the gantry frame 12; for example... Figure 5As shown, taking the installation of three spindles 30 on the gantry 12 as an example, together with three independent worktables, an independent three-channel machining center is formed, resulting in higher machining efficiency. The three spindles 30 are mounted on the crossbeam 122 of the gantry 12, and can slide relative to the crossbeam 122 in the X direction. The three spindles 30 are arranged in a left-center-right sequence on the crossbeam 122. The crossbeam 122 is equipped with a first X-axis motor 811, a second X-axis motor 821, and a third X-axis motor 831, which are independent of each other. The first X-axis motor 811, the second X-axis motor 821, and the third X-axis motor 831 are respectively equipped with a first lead screw assembly 812, a second lead screw assembly 822, and a third lead screw assembly 832. The three X-axis motors and the three lead screw assemblies cooperate to drive the three spindles 30 to move in the X direction. The first X-axis motor 811 and the third X-axis motor 831 are located at the two ends of the front side of the crossbeam 122, at the same height. The second X-axis motor 821 is located at the same end of the crossbeam 122 as the first X-axis motor 811, and is positioned above the first X-axis motor 811. In the X-direction, the second X-axis motor 821 is positioned closer to the inside of the crossbeam 122 than the first X-axis motor 811. Therefore, a gap is reserved at the tail of the second X-axis motor 821 for the wires leading out from the tail of the first X-axis motor 811. The wires of the first X-axis motor 811 and the second X-axis motor 821 are staggered by a certain distance in both the X and Z directions at the corresponding ends of the crossbeam 122. This facilitates the orderly arrangement of the wires of the first X-axis motor 811 and the second X-axis motor 821 from bottom to top before connecting them to the control system of the machining center. In addition, setting two of the three X-axis motors at the same height and at both ends of the crossbeam helps to reduce the space occupied by the three X-axis motors in the height direction, thereby reducing the size of the crossbeam 122 in the Z direction. To achieve the above-mentioned purpose of facilitating orderly cable arrangement and reducing the space occupied in the Z direction, the second X-direction motor 821 and the third X-direction motor 831 can be installed at the same end of the crossbeam 122. The first X-direction motor 811 and the third X-direction motor 831 are at the same height and located at both ends of the crossbeam 122 respectively. In the X direction, the second X-direction motor 821 is closer to the middle of the crossbeam 122 than the third X-direction motor 831.The above describes a configuration where two X-axis motors of equal height are positioned below, and another X-axis motor is positioned above the two equal-height X-axis motors. In other embodiments, two equal-height X-axis motors can be positioned above, and another X-axis motor can be positioned below. For example, the first X-axis motor 811 and the third X-axis motor 831 can be positioned at the same height and located at opposite ends of the crossbeam 122. The second X-axis motor 821 can be located at the same end of the crossbeam 122 as the first X-axis motor 811, and positioned below the first X-axis motor 811. In the X-axis direction, the first X-axis motor 811 is positioned closer to the inside of the crossbeam 122 than the second X-axis motor 821. Thus, a gap is reserved at the tail of the first X-axis motor 811, allowing the wire of the second X-axis motor 821 to be led out upward through this gap. Alternatively, when the first X-axis motor 811 and the third X-axis motor 831 are set at the same height, the second X-axis motor 821 and the third X-axis motor 831 are set at the same end of the crossbeam 122, with the second X-axis motor 821 located below the third X-axis motor 831. In the X direction, the third X-axis motor 831 is set closer to the inside of the crossbeam 122 than the second X-axis motor 821. A gap is reserved at the tail of the third X-axis motor 831 so that the wire of the second X-axis motor 821 can be led out upward through the gap.

[0042] The aforementioned first X-axis motor 811, second X-axis motor 821, and third X-axis motor 831 are arranged according to... Figure 5 The screws are arranged in the manner shown, such that the corresponding first screw assembly 812, second screw assembly 822, and third screw assembly 832 are arranged on the crossbeam 122 in the same manner. The second screw assembly 822 is used to drive the central spindle 30 to move in the X direction. Therefore, the second screw assembly 822 has a relatively long dimension in the X direction. The second screw assembly includes a second screw, one end of which is connected to the output end of the second X-direction motor 821, and the other end of which is connected to a screw mounting seat 824 mounted on the crossbeam 122. A screw nut seat 823 is provided on the second screw. The length of the second screw of the second screw assembly 822 is greater than the length of the screw of the first screw assembly 812 located below it.

[0043] A stop block 825 is provided on the crossbeam 122 on the side of the lead screw mounting seat 824 near the second X-direction motor 821. The stop block 825 and the lead screw mounting seat 824 form a limiting mechanism. The lead screw nut seat 823 moves between the stop block 825 and the lead screw mounting seat 824, that is, the limiting mechanism limits the range of movement of the lead screw nut seat 823 in the X direction, thereby limiting the range of movement of the central main shaft 30 in the X direction. The range of movement of the two main shafts 30 is determined by the first lead screw assembly 812. The distance between the stop block 825 and the lead screw mounting base 824 is set to be approximately equal to the lead screw lengths of the first lead screw assembly 812 and the third lead screw assembly 832, thus ensuring that the movement range of the three spindles 30 is comparable. Furthermore, the aforementioned limiting mechanism, consisting of the stop block 825 and the lead screw mounting base 824, is centrally positioned on the crossbeam 122 along the X-direction, preventing interference between the middle spindle 30 and the two spindles 30 on either side. This adjustment of the lead screw assembly, combined with the layout of the X-direction motor, makes the wiring, installation, and maintenance of the spindles easier. The stop block 825 uses an n-shaped baffle with a central hollow section. The n-shaped baffle is fixedly welded to the crossbeam 122, allowing the second lead screw to pass through the central hollow section. Other parts of the n-shaped baffle act as limiting components. When the lead screw nut seat 823 moves closer to the second X-axis motor 821 and abuts against the n-shaped baffle, the lead screw nut seat 823 can no longer move closer to the second X-axis motor 821. At this point, the second X-axis motor 823 can stop rotating or rotate in the opposite direction. Using a simplified n-shaped baffle to achieve this important limiting function simplifies space and saves material costs.

[0044] In other embodiments, the machining center is equipped with four worktables 20 and four spindles 30 located on the crossbeam 122. The four spindles 30 are driven to move along the crossbeam 122 in the X direction by independent first X-axis motors, second X-axis motors, third X-axis motors, and fourth X-axis motors, respectively equipped with first lead screw assemblies, second lead screw assemblies, third lead screw assemblies, and fourth lead screw assemblies. Among the four X-axis motors, two pairs are set at the same height, with one pair of X-axis motors at the same height located above another pair of X-axis motors at the same height. Specifically, the first X-axis motor and the fourth X-axis motor are located at both ends of the front side of the crossbeam 122 and are at roughly the same height, while the second X-axis motor and the third X-axis motor are located at both ends of the front side of the crossbeam 122 and are at roughly the same horizontal height. The first X-axis motor and the second X-axis motor are located on the same end side of the crossbeam 122, with the second X-axis motor located above the first X-axis motor. The third X-axis motor and the fourth X-axis motor are located on the same end of the crossbeam 122, with the third X-axis motor located above the fourth X-axis motor. In the X-axis direction, the second X-axis motor is positioned closer to the inside of the crossbeam 122 than the first X-axis motor, so that a gap is reserved at the tail of the second X-axis motor, allowing the wire of the first X-axis motor to be led out upward through this gap. Similarly, in the X-axis direction, the third X-axis motor is positioned closer to the inside of the crossbeam 122 than the fourth X-axis motor, so that a gap is reserved at the tail of the third motor, allowing the wire of the fourth X-axis motor to be led out upward through this gap. Four main spindles 30 are arranged sequentially in the X-direction and mounted on a crossbeam 122. The two middle spindles 30 are driven by a second X-direction motor driving a second lead screw assembly and a third X-direction motor driving a third lead screw assembly, respectively. The two spindles on either side are driven by a first X-direction motor driving a first lead screw assembly and a fourth X-direction motor driving a fourth lead screw assembly, respectively. The lead screw lengths of the second and third lead screw assemblies are greater than those of the first and fourth lead screw assemblies. Given the relatively large lengths of the lead screws in the second and fourth lead screw assemblies, lead screw mounting seats and stop blocks are configured on the crossbeam 122 for the lead screws of the second and fourth lead screw assemblies to limit the range of motion of the lead screw nut seats on the second and fourth lead screw assemblies, thereby limiting the movement range of the two middle spindles 30 in the X-direction and preventing interference between the spindles 30 during X-direction movement. The lead screw mounting seats and stop blocks configured for the lead screw assemblies... Figure 5 The structures shown are the same, so they will not be described again here.

[0045] In the structure that uses four X-axis motors to drive four main shafts 30 respectively, the two X-axis motors at the lower level are set at the middle along the X-axis away from the length of the crossbeam 122, and the two X-axis motors at the upper level are set at the middle along the X-axis close to the length of the crossbeam 122. This makes the four X-axis motors and their corresponding four lead screw assemblies occupy as little space as possible in the Z-axis, while also facilitating the orderly arrangement of the wires of multiple X-axis motors.

[0046] A mounting groove 1221, recessed rearward along the Y-direction, is provided on the crossbeam 122. The mounting groove 1221 extends laterally along the crossbeam 122. An X-direction motor and a lead screw assembly are installed within the mounting groove 1221. The X-direction motor drives the lead screw assembly to move, thereby driving the main shaft 30 to move along the X-direction. A notch 1222 is provided on the upper wall of the mounting groove 1221 at a position corresponding to the tail end of the X-direction motor located above. The wires of the tail end of the X-direction motor can be led upward through the notch 1222, thereby avoiding interference between the X-direction motor wires and the crossbeam 122 and facilitating the orderly arrangement of the X-direction motor wires. A pair of guide rails 131 extending in the X direction are provided on the front side of the mounting groove 1221 along the Y direction on both sides. That is, the pair of guide rails 131 are located at the upper and lower sides of the mounting groove 1221 respectively, and the guide rails 131 extend integrally from one end of the crossbeam 122 to the other end. The main shaft 30 located on the crossbeam 122 is slidably mounted on the two guide rails 131 through the X-direction slide 31. The X-direction slide 31 of the main shaft 30 is specifically connected to the lead screw nut seat of the lead screw assembly. A rearwardly recessed mounting groove 1221 is provided on the crossbeam 122. The lead screw assembly is placed in the mounting groove 1221 so that the lead screw assembly avoids the main shaft 30, and it is convenient to connect and fix the lead screw nut seat of the lead screw assembly to the X-direction slide 31 of the main shaft 30.

[0047] Taking the above-mentioned configuration of three spindles 30 as an example, the first X-axis motor 811, the second X-axis motor 821, the third X-axis motor 831, the first lead screw assembly 812, the second lead screw assembly 822, and the third lead screw assembly 832 are all located in the mounting groove 1221. The second X-axis motor 821 is located above the first X-axis motor 811 and the third X-axis motor 831. A notch 1222 is left at one end of the upper wall of the mounting groove 1221 corresponding to the tail of the second X-axis motor 821, and the wire of the second X-axis motor 821 can be led out upward through the notch 1222.

[0048] As described above, when four spindles 30 are configured, the first X-axis motor, second X-axis motor, third X-axis motor, fourth X-axis motor, first lead screw assembly, second lead screw assembly, third lead screw assembly, and fourth lead screw assembly are all housed in the mounting slot 1221. The second and third X-axis motors are positioned above the first and fourth X-axis motors. Notches 1222 are provided at both ends of the upper wall of the mounting slot 1221, corresponding to the tail positions of the second and third X-axis motors, respectively. The wiring of the second and third X-axis motors is led upwards through the two notches 1222 at both ends of the upper wall of the mounting slot 1221. This adjustment of the lead screw assembly, combined with the layout of the X-axis motors and the notch design on the upper wall of the crossbeam mounting slot, further simplifies the wiring, installation, and maintenance of the spindles. Furthermore, the material used in the crossbeam is reduced accordingly, further lowering costs.

[0049] The machining center of this utility model can be a multi-station machining center with three worktables 20 as described above, or a single-station machining center with one worktable 20. Regardless of the number of worktables 20, in the tool transport assembly 40 of this utility model, the second track cooperating with the movable seat 41 is offset from the first track 11 in the X direction, so that the second drive mechanism cooperating with the second track and the first drive mechanism 60 cooperating with the first track 11 are offset by a certain distance in the X direction, so that the second drive mechanism will not occupy the installation space of the first drive mechanism 60. When multiple worktables 20 are used, the multiple tool storage parts 411 on the movable seat 41 move synchronously between the spindle 30 and the tool magazine 50 with the movable seat 41. The spindle 30 corresponding to each worktable 20 can realize synchronous tool changing, avoiding the situation where the spindle 30 on one worktable 20 is machining while the spindle 30 on another worktable 20 is changing tools, thus ensuring the machining accuracy of the workpiece.

[0050] The above provides a detailed description of a machining center provided by the embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas and methods of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A spindle mounting structure for a machining center, characterized in that, The device includes a gantry frame for mounting the spindles. The gantry frame includes vertical beams on both sides and a horizontal beam connected to the top of the two vertical beams. Three or more spindles are mounted on the horizontal beam. The horizontal beam has a mounting groove that is recessed backward along the Y direction. The mounting groove extends laterally along the horizontal beam. An X-axis motor and a lead screw assembly are installed in the mounting groove. The X-axis motor drives the lead screw assembly to drive the spindle to move along the X direction. A notch is left at the position of the upper X-axis motor tail on the upper wall of the mounting groove so that the wire of the X-axis motor can be led out upward through the notch.

2. The spindle mounting structure of the machining center as described in claim 1, characterized in that, The crossbeam has three main spindles arranged sequentially from left to right. Each spindle is driven to move upward along the crossbeam by an independent first X-axis motor, second X-axis motor, and third X-axis motor, each equipped with a first lead screw assembly, second lead screw assembly, and third lead screw assembly, respectively. The first and third X-axis motors are located at opposite ends of the front side of the crossbeam and are at roughly the same horizontal height. The second X-axis motor is located on the same end side of the crossbeam as the first or third X-axis motor, and is positioned above the first or third X-axis motor. The second X-axis motor is positioned further inward in the X-direction than the first or third X-axis motor to leave a tail gap so that the wiring of the first or third X-axis motor below can be led upward; or the second X-axis motor and the first or third X-axis motor are located on the same end side of the crossbeam, with the second X-axis motor located below the first or third X-axis motor, and the first or third X-axis motor is positioned further inward in the X-direction than the second X-axis motor to leave a tail gap so that the wiring of the second X-axis motor below can be led upward.

3. The spindle mounting structure of the machining center as described in claim 2, characterized in that, The second lead screw assembly includes a second lead screw, one end of which is connected to a second X-axis motor, and the other end of which is connected to a lead screw mounting seat mounted on a crossbeam. A lead screw nut seat is provided on the second lead screw. A stop block is provided on the crossbeam on the side of the lead screw mounting seat near the second X-axis motor. The stop block and the lead screw mounting seat together form a limiting mechanism. The distance between the stop block and the lead screw mounting seat is equivalent to the length of the lead screw in the first or third lead screw assembly. The limiting mechanism is centrally located in the X-direction of the crossbeam. The lead screw nut seat on the second lead screw moves between the stop block and the lead screw mounting seat to limit the range of movement of the intermediate spindle in the X-direction at the center of the crossbeam.

4. The spindle mounting structure of the machining center as described in claim 3, characterized in that, The stop block adopts an n-shaped baffle with a hollow center. The n-shaped baffle is fixed on the crossbeam and the second lead screw passes through the hollow center of the n-shaped baffle.

5. The spindle mounting structure of the machining center as described in any one of claims 2-4, characterized in that, The crossbeam is provided with a mounting groove that is recessed backward along the Y direction. The mounting groove extends laterally along the crossbeam. The first X-axis motor, the second X-axis motor, the third X-axis motor, the first lead screw assembly, the second lead screw assembly, and the third lead screw assembly are all located in the mounting groove. The upper wall of the mounting groove has a notch at the tail position of the upper X-axis motor among the first X-axis motor, the second X-axis motor, and the third X-axis motor, so that the wires of the upper X-axis motor among the first X-axis motor, the second X-axis motor, and the third X-axis motor can be led out upward through the notch.

6. The spindle mounting structure of the machining center as described in claim 1, characterized in that, Four main shafts are arranged sequentially along the X-axis on the crossbeam. Each main shaft is driven by an independent first X-axis motor, a second X-axis motor, a third X-axis motor, and a fourth X-axis motor, respectively equipped with a first lead screw assembly, a second lead screw assembly, a third lead screw assembly, and a fourth lead screw assembly, to move along the crossbeam in the X-axis direction. The first and fourth X-axis motors are located at opposite ends of the front side of the crossbeam and are at roughly the same height. The second and third X-axis motors are located at opposite ends of the front side of the crossbeam and are at roughly the same height. The first and second X-axis motors are located on the same end side of the crossbeam, with the second X-axis motor located above the first X-axis motor. The third and fourth X-axis motors are located on the same end side of the crossbeam, with the third X-axis motor located above the fourth X-axis motor. The second X-axis motor is positioned further inward in the X-axis direction than the first X-axis motor to leave a tail gap so that the wires of the first X-axis motor below can be led upward. The third X-axis motor is positioned further inward in the X-axis direction than the fourth X-axis motor to leave a tail gap so that the wires of the fourth X-axis motor below can be led upward.

7. The spindle mounting structure of the machining center as described in claim 6, characterized in that, The two central spindles are respectively connected to the lead screw nut seats of the second and third lead screw assemblies, and the two side spindles are respectively connected to the lead screw nut seats of the first and fourth lead screw assemblies. The lead screw lengths of the second and third lead screw assemblies are greater than the lead screw lengths of the first and fourth lead screw assemblies. Two limiting mechanisms are provided on the crossbeam, corresponding to the lead screw nut seats on the second and third lead screw assemblies, respectively. The limiting mechanism includes a lead screw mounting seat installed on the crossbeam and a stop block offset from the lead screw mounting seat in the X direction. The lead screw nut seats of the second and third lead screw assemblies are respectively located between the lead screw mounting seats and the stop blocks of the two limiting mechanisms. The lead screw nut seats move between the lead screw mounting seats and the stop blocks of the limiting mechanisms to limit the range of movement of the spindles connected to the lead screw nut seats in the X direction.

8. The spindle mounting structure of the machining center as described in claim 6 or 7, characterized in that, The crossbeam is provided with a mounting groove that is recessed backward along the Y direction. The mounting groove extends laterally along the crossbeam. The first X-axis motor, the second X-axis motor, the third X-axis motor, the fourth X-axis motor, the first lead screw assembly, the second lead screw assembly, the third lead screw assembly, and the fourth lead screw assembly are all located in the mounting groove. The upper wall of the mounting groove has a notch at the tail position corresponding to the second X-axis motor and the third X-axis motor so that the wires of the second X-axis motor and the third X-axis motor can be led out upward through the notch.

9. The spindle mounting structure of the machining center as described in claim 1, characterized in that, A pair of guide rails extending integrally along the X direction are provided on the front side of the mounting slot along the Y direction on both sides. The main shaft located on the crossbeam is slidably mounted on the pair of guide rails through the X-direction slide block.

Images