A three-magazine machining center

Abstract

The application relates to the technical field of machining centers, in particular to a three-tool magazine machining center, which comprises a workbench and a rack arranged on the workbench, a main spindle box arranged on the rack, two main tool magazines arranged on the two sides of the main spindle box, a main tool changing mechanism arranged between the main tool magazines and the main spindle box, and a secondary tool magazine arranged on the rack, a secondary tool changing mechanism arranged between the secondary tool magazine and one of the main tool magazines, the three-tool magazine machining center can change the tools in the main tool magazines to the main spindle through the main tool changing mechanism, and can change the tools in the secondary tool magazine to the main tool magazine through the secondary tool changing mechanism, so that the tools can be quickly switched among the three tool magazines according to different machining requirements and workpiece requirements, different machining requirements can be quickly adapted without interrupting production, and the production efficiency is improved.

Description

Technical Field

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

[0002] Machining centers are highly automated machining equipment characterized by: a tool magazine enabling automatic tool changing; after a workpiece is clamped once, the machining center can automatically select the machining mode, change tools, automatically set tools, and automatically change the spindle speed and feed rate according to a pre-programmed CNC machining program, continuously completing multiple operations and reducing the time spent on auxiliary processes such as workpiece clamping, measurement, and machine tool adjustment. During operation, tools from one of the mounting brackets in the tool magazine are transported to the lower end of the spindle box via a transport mechanism. However, due to the limited number of mounting brackets in a single tool magazine, the number of tools that can be stored is relatively small, which cannot meet the configuration requirements of existing machining centers.

[0003] Chinese patent CN218904495U relates to a vertical machining center with a dual tool magazine, comprising a frame, a column, a tool magazine, and a machining mechanism. The column includes a fixed column and a supporting column, with the fixed block disposed on the frame. Two supporting columns are provided, each disposed on one side of the fixed column, and each supporting column is connected to the frame, with the tool magazine disposed on each supporting column. The machining mechanism is disposed on the fixed column.

[0004] This machining center uses two tool magazines to meet machining needs; however, the dual tool magazines may still limit the types of tools available, making it impossible to select the most suitable tool for some complex machining tasks, thus affecting machining quality and efficiency. Summary of the Invention

[0005] To address the aforementioned issues, a three-tool magazine machining center is provided. This center features two main tool magazines and one auxiliary tool magazine mounted on the frame. A main tool changer transfers tools from the main tool magazines to the spindle box, while an auxiliary tool changer is located between the auxiliary tool magazine and one of the main tool magazines. This solution resolves the problem that a dual-tool magazine might still limit the types of tools available, making it impossible to select the most suitable tool for some complex machining tasks, thus affecting machining quality and efficiency.

[0006] To address the problems of existing technologies, the present invention provides a three-tool magazine machining center, including a worktable and a frame mounted on the worktable. A spindle box is mounted on the frame, and two main tool magazines are mounted on both sides of the spindle box. A main tool changer is mounted between the main tool magazines and the spindle box. A secondary tool magazine is also mounted on the frame, and a secondary tool changer is mounted between the secondary tool magazine and one of the main tool magazines.

[0007] Preferably, the auxiliary tool changing mechanism includes a tool changing arm and a drive assembly for driving the tool changing arm to perform tool locking and tool changing operations. The tool changing arm has a first tool locking opening and a second tool locking opening symmetrically arranged at both ends along its center. The first tool locking opening is provided with a first locking block that can be withdrawn from it before tool locking, and the second tool locking opening is provided with a second locking block that can be withdrawn from it before tool locking.

[0008] Preferably, the end of the tool changing arm is further provided with a biting block located in the first and second cutting edges. The biting blocks in the first and second cutting edges can move along their opening directions respectively. The biting block has an arc strip that can engage with the groove on the tool holder. A rubber strip is also provided between the biting block and the end of the tool changing arm.

[0009] Preferably, the drive assembly has a body and an output shaft that can extend and rotate relative to the body. The auxiliary tool changing mechanism further includes a rotating cylinder, a connecting shaft, a first connecting rod, and a second connecting rod. The rotating cylinder is rotatably mounted on the body coaxially with the output shaft, and the output shaft extends into the rotating cylinder. A fixing ring is provided at the bottom end of the inner circumferential surface of the rotating cylinder. The connecting shaft is slidably mounted coaxially in the fixing ring. The bottom end of the fixing ring is connected to the center position of the tool changing arm. A limit ring is provided at the top end of the connecting shaft. A reset elastic element is provided between the limit ring and the fixing ring. There is a movable space between the output shaft and the limit ring. Both the first and second locking blocks can slide along the length direction of the tool changing arm. The two ends of the first connecting rod are rotatably connected to the output shaft and the first locking block, respectively. The two ends of the second connecting rod are rotatably connected to the output shaft and the second locking block, respectively. When the output shaft extends out, compresses the movable space, and abuts against the top end of the connecting shaft, the first connecting rod drives the first locking block to abut against the groove of one side of the tool bar, while the second connecting rod drives the second locking block to abut against the groove of the other side of the tool bar.

[0010] Preferably, the rotating cylinder is provided with slots extending along its axial direction, and there are two slots. The auxiliary tool changing mechanism also includes a central shaft, a connecting block, and an elastic connector. The central shaft is coaxially fixedly mounted on the output shaft, and a thin segment is provided at the bottom end of the central shaft. The end of the thin segment has a stepped surface. The connecting block is coaxially slidably mounted in the rotating cylinder. A first pivot and a second pivot are provided on the outer circumference of the connecting block, which respectively slide through the two slots. One end of the first connecting rod and the second connecting rod are rotatably connected to the first pivot and the second pivot, respectively. The narrow segment slides through the connecting block. The connecting block is coaxially slidably mounted in the rotating cylinder, and the elastic connector is provided between the stepped surface and the connecting block.

[0011] Preferably, a retaining ring is provided on the outer circumference of the thin section of the central shaft, and the connecting block elastically abuts against the top of the retaining ring.

[0012] Preferably, the connecting shaft has a hollow section, and a thin section of the central shaft extends into the hollow section of the connecting shaft, with the thin section of the central shaft and the hollow section of the connecting shaft engaging in a sliding fit.

[0013] Preferably, the connecting shaft includes a fitting block, a hollow tube, and a connecting nut. The fitting block is fitted at the center of the tool changing arm, and a first connecting post and a second connecting post are respectively provided at both ends of the fitting block. The hollow tube is threaded to the first connecting post, and the hollow tube and the fixing ring are fitted and slidably engaged. The connecting nut is threaded to the second connecting post, and the connecting nut abuts against the bottom end of the tool changing arm.

[0014] Preferably, the two ends of the tool changing arm are respectively provided with a first sliding groove and a second sliding groove extending along its length direction. The first sliding groove faces the first locking blade opening, and the second sliding groove faces the second locking blade opening. The first locking block is slidably disposed in the first sliding groove, and the second locking block is slidably disposed in the second sliding groove. The outer end of the first sliding groove is also provided with a first pressure plate covering the outer side of the first locking block, and the outer end of the second sliding groove is also provided with a second pressure plate covering the outer end of the second locking block.

[0015] Preferably, the tool changing arm includes a central section connected to the output shaft at its center, and a first tool retaining block and a second tool retaining block that can be detachably connected to both sides of the central section. The first tool retaining edge is disposed on the first tool retaining block, and the second tool retaining edge is disposed on the second tool retaining block.

[0016] The advantages of this application compared to the prior art are:

[0017] This invention features two main tool magazines and one secondary tool magazine on the machine frame. The main tool changer can transfer tools from the main tool magazine to the spindle, while the secondary tool changer can transfer tools from the secondary tool magazine to the main tool magazine. This allows for rapid tool switching between the three tool magazines according to different processing requirements and workpiece specifications. It can quickly adapt to different processing needs without interrupting production, thereby improving production efficiency. Attached Figure Description

[0018] Figure 1 This is a 3D view of a three-tool magazine machining center.

[0019] Figure 2 This is a schematic diagram of the auxiliary tool changer mechanism in a three-tool magazine machining center before tool locking.

[0020] Figure 3 This is a schematic diagram of the auxiliary tool changer mechanism in a three-tool magazine machining center after tool locking.

[0021] Figure 4 This is a schematic diagram of the auxiliary tool changer mechanism in a three-tool magazine machining center after tool retraction.

[0022] Figure 5 This is a schematic diagram of the auxiliary tool changer mechanism in a three-tool magazine machining center after tool rotation.

[0023] Figure 6 This is a sectional view of the secondary tool changer mechanism in a three-tool magazine machining center.

[0024] Figure 7 yes Figure 6 A magnified view of part A.

[0025] Figure 8 This is an exploded view of the engagement block and rubber strip in the secondary tool changing mechanism of a three-tool magazine machining center.

[0026] Figure 9 This is a partial exploded 3D view of a three-tool magazine machining center.

[0027] Figure 10 This is a three-dimensional exploded view of the rotating cylinder in a three-tool magazine machining center.

[0028] The diagram is labeled as follows: 1. Frame; 2. Spindle box; 3. Main tool magazine; 4. Main tool changer; 5. Secondary tool magazine; 6. Secondary tool changer; 61. Tool changer arm; 611. First tool locking edge; 6111. First locking block; 612. Second tool locking edge; 6121. Second locking block; 613. First pressure plate; 614. Second pressure plate; 615. Center section; 616. First tool locking block; 617. Second tool locking block; 62. Drive assembly; 621. Body; 622. Output shaft; 631. Engaging block; 632. Rubber strip; 641. Rotating cylinder; 6411. Fixing ring; 6412. Groove; 6421. Fitting block; 6422. Hollow tube; 6423. Connecting nut; 643. Limiting ring; 644. First connecting rod; 645. Second connecting rod; 646. Reset elastic element; 651. Central shaft; 652. Connecting block; 6521. First pivot; 6522. Second pivot; 653. Elastic connector; 654. Snap ring; 7. Tool holder. Detailed Implementation

[0029] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, this application provides:

[0031] A three-tool magazine machining center includes a worktable and a frame 1 mounted on the worktable. A spindle box 2 is mounted on the frame 1, and two main tool magazines 3 are mounted on both sides of the spindle box 2. A main tool changer 4 is mounted between the main tool magazines 3 and the spindle box 2. A secondary tool magazine 5 is also mounted on the frame 1, and a secondary tool changer 6 is mounted between the secondary tool magazine 5 and one of the main tool magazines 3.

[0032] In use, the workpiece can be fixed on the worktable. By starting the spindle box 2, the spindle box 2 drives the tool mounted on the spindle to rotate, thereby machining the workpiece.

[0033] When it is necessary to transfer the tool from the main tool magazine to the spindle, the corresponding main tool changer 4 is activated, enabling the main tool changer 4 to transfer the tool from the main tool magazine 3 to the spindle, thus making it suitable for complex machining tasks.

[0034] When it is necessary to replace the tool in the main tool magazine 3, or to replace the tool in the secondary tool magazine 5, the secondary tool changer 6 is activated, so that the secondary tool changer 6 can transfer the tool from the secondary tool magazine 5 to the main tool magazine 3.

[0035] This embodiment sets up two main tool magazines 3 and one secondary tool magazine 5 on the frame 1. The main tool changer 4 can switch the tools in the main tool magazine 3 to the spindle, while the secondary tool changer 6 can switch the tools in the secondary tool magazine 5 to the main tool magazine 3. The tool can be quickly switched between the three tool magazines according to different processing needs and workpiece requirements. It can quickly adapt to different processing needs without interrupting production, thereby improving production efficiency.

[0036] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the auxiliary tool changing mechanism 6 includes a tool changing arm 61 and a drive assembly 62 for driving the tool changing arm 61 to perform tool locking and tool changing operations. The two ends of the tool changing arm 61 are provided with a first tool locking opening 611 and a second tool locking opening 612 symmetrically arranged along its center. The first tool locking opening 611 is provided with a first locking block 6111 that can be withdrawn from it before tool locking, and the second tool locking opening 612 is provided with a second locking block 6121 that can be withdrawn from it before tool locking.

[0037] When the tool changing arm 61 holds the tool holder 7, a "click" metallic impact sound is produced. This sound originates from the impact between the tool holder 7 and the first locking block 6111 and the second locking block 6121. Under normal conditions, the first locking block 6111 and the second locking block 6121 will be displaced towards the first locking blade edge 611 and the second locking blade edge 612 by the supporting action of the elastic component at the rear end, so that the ends of the first locking block 6111 and the second locking block 6121 extend out of the locking blade edge. Therefore, whether it is locking the tool or changing the tool, the tool holder 7 will impact the ends of the first locking block 6111 and the second locking block 6121, producing a metallic impact sound. Furthermore, the frequent collisions between the tool holder 7, the first engaging block 6111, and the second engaging block 6121 can easily lead to vibration and wear damage to the relevant components, reducing their service life, accelerating their obsolescence, and increasing maintenance costs. Especially in an era that emphasizes rapid tool changes, as speeds increase, the impact force increases with the increase in speed, leading to increased vibration and wear on the relevant components.

[0038] For reference, please refer to the knife handle. Figure 2As shown, in this embodiment, before the first locking block 6111 and the second locking block 6121 are engaged, the blade changing arm 61 rotates at a certain angle, causing the first locking blade 611 to move toward the left side of the blade 7, and the second locking blade 612 to move toward the right side of the blade 7. At this time, the first locking block 6111 exits from the first locking blade 611, and the second locking block 6121 exits from the second locking blade 612. When the left blade 7 moves to the first locking port and the right blade 7 moves to the second locking port, the blade 7 does not collide with the first locking block 6111 and the second locking block 6121, thus avoiding vibration caused by impact.

[0039] like Figure 3 As shown, the first locking block 6111 drives the left-side cutter bar 7 to lock in the first locking port, while the second locking block 6121 locks the right-side cutter bar 7 in the second locking port.

[0040] The tool changing process is as follows Figure 4 and Figure 5 As shown, the tool changing arm 61 moves downwards, causing the tool holders 7 on both sides to retract from the main tool magazine 3 and the secondary tool magazine 5 while locked, until they are fully retracted. Then, the tool changing arm 61 rotates to switch tools, after which it returns to its original position. This design avoids loud metallic clanging noises when the tool changing arm 61 holds the tool holders 7, while also reducing wear on related components caused by impact, thus extending their service life. Furthermore, this design simplifies related components and reduces manufacturing technology and costs.

[0041] like Figure 8 As shown, the end of the tool changing arm 61 is also provided with a biting block 631 located in the first locking blade opening 611 and the second locking blade opening 612. The biting blocks in the first locking blade opening 611 and the second locking blade opening 612 can move along their opening directions respectively. The biting block 631 has an arc strip that can engage with the groove on the tool holder 7. A rubber strip 632 is also provided between the biting block 631 and the end of the tool changing arm 61.

[0042] In order to ensure that the tool holder 7 can be stably locked in the first locking edge 611 and the second locking edge 612, a locking block 631 is provided in the first locking edge 611 and the second locking edge 612. The arc strip on the inner side of the locking block 631 can be locked in the groove of the tool holder 7, thereby accurately positioning the tool holder 7. At the same time, the rubber strip 632 can buffer the impact force between the arc strip and the groove of the tool holder 7, further improving the stability of tool changing.

[0043] like Figure 6 and Figure 7 As shown, the drive assembly 62 has a body 621 and an output shaft 622 that can extend and rotate relative to the body 621. The auxiliary tool changer 6 also includes a rotating cylinder 641, a connecting shaft, a first connecting rod 644, and a second connecting rod 645.

[0044] The rotating cylinder 641 is rotatably mounted on the body 621 coaxially with the output shaft 622. The output shaft 622 extends into the rotating cylinder 641. A fixing ring 6411 is provided at the bottom of the inner circumferential surface of the rotating cylinder 641.

[0045] The connecting shaft is coaxially and slidably disposed in the fixed ring 6411. The bottom end of the fixed ring 6411 is connected to the center position of the tool changing arm 61. The top end of the connecting shaft is provided with a limit ring 643. A reset elastic element 646 is provided between the limit ring 643 and the fixed ring 6411. There is a space for movement between the output shaft 622 and the limit ring 643.

[0046] Both the first locking block 6111 and the second locking block 6121 can slide along the length of the tool changing arm 61. The two ends of the first connecting rod 644 are rotatably connected to the output shaft 622 and the first locking block 6111, respectively. The two ends of the second connecting rod 645 are rotatably connected to the output shaft 622 and the second locking block 6121, respectively. When the output shaft 622 extends out of the compression space and abuts against the top of the connecting shaft, the first connecting rod 644 drives the first locking block 6111 to abut against the groove of one side of the tool holder 7, while the second connecting rod 645 drives the second locking block 6121 to abut against the groove of the other side of the tool holder 7.

[0047] A fixed ring is provided at the top of the outer circumference of the rotating cylinder 641. The fixed ring is connected to the bottom of the body 621 and allows relative rotation.

[0048] When the output shaft 622 of the drive assembly 62 extends relative to the body 621, the end of the output shaft 622 drives the first connecting rod 644 and the second connecting rod 645 to unfold on both sides of the tool changing arm 61. The lower end of the first connecting rod 644 is rotatably connected to the first locking block 6111, and the lower end of the second connecting rod 645 is rotatably connected to the second locking block 6121, so that the first locking block 6111 and the second locking block 6121 can move in opposite directions. This allows the first locking block 6111 to lock the tool bar 7 in the first locking port, and the second locking block 6121 to lock the tool bar 7 in the second locking port. Then the output rod continues to move downward. The output rod moves until it abuts against the connecting shaft and moves it downward. The connecting shaft overcomes the elastic force of the reset elastic element 646 and moves downward, causing the tool changing arm 61 at the bottom of the connecting shaft to move downward relative to the rotating cylinder 641. This allows the tool changing arm 61 to pull the tool bar 7 out of the main tool magazine 3 or the secondary tool magazine 5. Then, the output shaft 622 of the drive assembly 62 rotates 180 degrees, causing the positions of the tool bars 7 on both sides to be exchanged. Then, the output shaft 622 resets, and the connecting shaft and the tool changing arm 61 reset, until the first locking block 6111 exits from the first locking port and the second locking block 6121 exits from the second locking port, thereby realizing the tool change.

[0049] During rotation, the first locking block 6111 and the second locking block 6121 always lock the tool holder 7, allowing the tool changing arm 61 to rotate forward or backward, making the structure more stable.

[0050] The drive assembly 62 used to drive the rotation and movement of the tool changer arm 61 is existing technology and will not be described in detail here.

[0051] like Figure 9 and Figure 10 As shown, the rotating cylinder 641 is provided with slots 6412 extending along its axial direction. There are two slots 6412. The auxiliary tool changing mechanism 6 also includes a central shaft 651, a connecting block 652, and an elastic connecting member 653.

[0052] The central shaft 651 is coaxially and fixedly mounted on the output shaft 622. The bottom end of the central shaft 651 is provided with a thin segment, and the end of the thin segment has a stepped surface.

[0053] The connecting block 652 is coaxially and slidably disposed in the rotating cylinder 641. The outer circumferential surface of the connecting block 652 is provided with a first pivot 6521 and a second pivot 6522 that slide through the two slots 6412 respectively. One end of the first connecting rod 644 and the second connecting rod 645 are rotatably connected to the first pivot 6521 and the second pivot 6522 respectively. A narrow section slides through the connecting block 652.

[0054] The connecting block 652 is slidably disposed coaxially in the rotating cylinder 641, and the elastic connecting member 653 is disposed between the stepped surface and the connecting block 652.

[0055] The connecting block 652 is rotatably connected to the first connecting rod 644 and the second connecting rod 645 via the first pivot 6521 and the second pivot 6522. When the output shaft 622 drives the central shaft 651 to move downward, the central shaft 651 and the connecting block 652 are connected by the elastic connector 653, which can prevent the rigid force of the output shaft 622 from being directly transmitted to the tool holder 7. At the same time, it can buffer the impact force of the first fastening block 6111 and the second fastening block 6121 on the tool holder 7, making the component more stable.

[0056] like Figure 7 and Figure 10 As shown, a retaining ring 654 is provided on the outer circumference of the thin section of the central shaft 651, and the connecting block 652 elastically abuts against the top of the retaining ring 654.

[0057] By providing a retaining ring 654 on the central shaft 651, the connecting block 652 can be prevented from detaching from the central shaft 651, allowing the connecting block 652 to drive the first connecting rod 644 and the second connecting rod 645 to unfold stably.

[0058] like Figure 7As shown, the connecting shaft has a hollow section, and a thin section of the central shaft 651 extends into the hollow section of the connecting shaft. The thin section of the central shaft 651 and the hollow section of the connecting shaft are fitted and slidably engaged.

[0059] The thin section of the central shaft 651 is extended into the central section 615 of the connecting shaft, thereby making the structure more stable and ensuring that the central shaft 651 and the connecting shaft can move coaxially.

[0060] like Figure 7 As shown, the connecting shaft includes a fitting block 6421, a hollow tube 6422, and a connecting nut 6423.

[0061] The fitting block 6421 is fitted into the center of the tool changing arm 61, and the two ends of the fitting block 6421 are respectively provided with a first connecting post and a second connecting post;

[0062] The hollow tube 6422 is threadedly connected to the first connecting post, and the hollow tube 6422 and the fixing ring 6411 are fitted and slidably engaged.

[0063] The connecting nut 6423 is threadedly connected to the second connecting column, and the connecting nut 6423 abuts against the bottom end of the tool changing arm 61.

[0064] By setting the fitting block 6421 at the center of the tool changing arm 61, connecting the connecting nut 6423 to the second connecting post, and connecting the central tube to the first connecting post, the tool changing arm 61 can rotate and move stably relative to the rotating cylinder 641.

[0065] like Figure 8 As shown, the two ends of the blade changing arm 61 are respectively provided with a first sliding groove and a second sliding groove extending along its length direction. The first sliding groove faces the first locking blade 611, and the second sliding groove faces the second locking blade 612. The first locking block 6111 is slidably disposed in the first sliding groove, and the second locking block 6121 is slidably disposed in the second sliding groove. The outer end of the first sliding groove is also provided with a first pressure plate 613 covering the outer side of the first locking block 6111, and the outer end of the second sliding groove is also provided with a second pressure plate 614 covering the outer end of the second locking block 6121.

[0066] The tool changing arm 61 is provided with a first sliding groove and a second sliding groove. The first engaging block 6111 and the second engaging block 6121 are slidably installed in the tool changing arm 61 through the first sliding groove and the second sliding groove. The first pressure plate 613 and the second pressure plate 614 are used to prevent the first engaging block 6111 and the second engaging block 6121 from disengaging from the tool changing arm 61, thereby ensuring their sliding stability.

[0067] like Figure 8As shown, the tool changing arm 61 includes a central section 615 connected to the output shaft 622 at its center, and a first tool retaining block 616 and a second tool retaining block 617 that can be detachably connected to both sides of the central section 615. The first tool retaining edge 611 is provided on the first tool retaining block 616, and the second tool retaining edge 612 is provided on the second tool retaining block 617.

[0068] To accommodate different models of tool holders 7, the first locking block 616 and the second locking block 617 with different sizes of first and second locking openings are replaced with the corresponding center section 615, so as to clamp or lock the tool holders 7 of different sizes.

[0069] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A three-tool magazine machining center, comprising a worktable and a frame mounted on the worktable, a spindle head mounted on the frame, and two main tool magazines mounted on either side of the spindle head, wherein a main tool changer is provided between the main tool magazines and the spindle head, characterized in that, The frame is also equipped with a secondary tool magazine, and a secondary tool changer is provided between the secondary tool magazine and one of the main tool magazines; The auxiliary tool changing mechanism includes a tool changing arm and a drive assembly for driving the tool changing arm to perform tool locking and tool changing operations. The two ends of the tool changing arm are provided with a first tool locking opening and a second tool locking opening symmetrically arranged along its center. A first locking block that can be withdrawn from the first tool locking opening is provided in the first tool locking opening, and a second locking block that can be withdrawn from the second tool locking opening is provided in the second tool locking opening. The end of the tool changing arm is also provided with a biting block located in the first and second cutting edges. The biting blocks in the first and second cutting edges can move along their opening directions respectively. The biting block has an arc strip that can engage with the groove on the tool holder. A rubber strip is also provided between the biting block and the end of the tool changing arm. The drive assembly has a body and an output shaft that can extend and rotate relative to the body. The auxiliary tool changing mechanism also includes a rotating cylinder, a connecting shaft, a first connecting rod and a second connecting rod. The rotating cylinder is rotatably mounted on the body coaxially with the output shaft. The output shaft extends into the rotating cylinder. A fixing ring is provided at the bottom end of the inner circumferential surface of the rotating cylinder. The connecting shaft is coaxially and slidably disposed in the fixed ring. The bottom end of the fixed ring is connected to the center position of the tool changing arm. A limit ring is provided at the top end of the connecting shaft. A reset elastic element is provided between the limit ring and the fixed ring. There is a space for movement between the output shaft and the limit ring. Both the first and second locking blocks can slide along the length of the tool changing arm. The two ends of the first connecting rod are rotatably connected to the output shaft and the first locking block, respectively. The two ends of the second connecting rod are rotatably connected to the output shaft and the second locking block, respectively. When the output shaft extends out of the compression space and abuts against the top of the connecting shaft, the first connecting rod drives the first locking block to abut against the groove of one side of the tool bar, while the second connecting rod drives the second locking block to abut against the groove of the other side of the tool bar. The rotating cylinder is provided with slots extending along its axial direction. There are two slots. The auxiliary tool changing mechanism also includes a central shaft, a connecting block and an elastic connector. The central shaft is coaxially and fixedly mounted on the output shaft. The bottom end of the central shaft is provided with a thin segment, and the end of the thin segment has a stepped surface. The connecting block is coaxially and slidably disposed in the rotating cylinder. The outer circumferential surface of the connecting block is provided with a first pivot and a second pivot that slide through two slots respectively. One end of the first connecting rod and the second connecting rod are rotatably connected to the first pivot and the second pivot respectively. The narrow section slides through the connecting block. The connecting block is coaxially and slidably disposed in the rotating cylinder, and the elastic connecting member is disposed between the stepped surface and the connecting block; A retaining ring is provided on the outer circumference of the thin section of the central shaft, and the connecting block elastically abuts against the top of the retaining ring; The connecting shaft has a hollow section, and a thin section of the central shaft extends into the hollow section of the connecting shaft. The thin section of the central shaft and the hollow section of the connecting shaft are fitted and slidably engaged. The connecting shaft includes a fitting block, a hollow tube, and a connecting nut. The fitting block is fitted into the center of the tool changing arm, and a first connecting post and a second connecting post are respectively provided at both ends of the fitting block. The hollow tube is threaded to the first connecting post, and the hollow tube and the fixing ring are fitted together in a sliding fit. The connecting nut is threaded to the second connecting column, and the connecting nut abuts against the bottom end of the tool changing arm.

2. The three-tool magazine machining center according to claim 1, characterized in that, The two ends of the tool changing arm are respectively provided with a first sliding groove and a second sliding groove extending along its length. The first sliding groove faces the first locking blade opening, and the second sliding groove faces the second locking blade opening. The first locking block is slidably disposed in the first sliding groove, and the second locking block is slidably disposed in the second sliding groove. The outer end of the first sliding groove is also provided with a first pressure plate covering the outer side of the first locking block, and the outer end of the second sliding groove is also provided with a second pressure plate covering the outer end of the second locking block.

3. A three-tool magazine machining center according to claim 1, characterized in that, The tool changing arm includes a central section connected to the output shaft at its center, and a first tool retaining block and a second tool retaining block that can be detachably connected to both sides of the central section. The first tool retaining edge is set on the first tool retaining block, and the second tool retaining edge is set on the second tool retaining block.

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