A five-axis CNC machining center and its tool magazine

Abstract

The present invention relates to the technical field of CNC machining centers, specifically to a five-axis CNC machining center and its tool magazine, including a machining center body, a driving shaft driven by a motor is arranged in the machining center body, a tool changing arm is fixedly mounted on the driving shaft, the tool changing arm has a tool changing claw, the tool changing claw cooperates with the tool through the rotation of the tool changing arm, a snap-fit ​​device is arranged on the tool changing arm, the snap-fit ​​device presses the tool against the tool changing claw by pneumatic means, the tool changing arm is provided with a locking device, the locking device is used to limit the movement of the snap-fit ​​device, the snap-fit ​​device includes a snap-fit ​​claw rotatably mounted on the overhanging end of the tool changing claw, and a magnet is fixedly mounted on the end face of the end of the snap-fit ​​claw that is not connected to the tool changing claw. The present invention aims to reduce the risk of tool dropping accidents when a CNC machining center interacts with a tool magazine to change tools.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining centers, in particular to a five-axis numerical control machining center and a tool magazine thereof. Background Art

[0002] A CNC machining center is a machining device that uses a computer program to control a servo motor to manipulate a tool to process materials and ultimately form a finished workpiece. In addition, a five-axis CNC machining center can automatically process workpieces of complex shapes with a high degree of automation and a high rate of finished product qualification, which can greatly shorten the machining process, reduce production costs, and help ensure the quality of finished products.

[0003] The two important components of a CNC machining center are the tool magazine and the machining center body. The machining center body is used to process the workpiece, while the tool magazine is used to store the tools required for machining for the machining center body. Correspondingly, in order to be able to replace the tools in the tool magazine with the tools installed on the machining center body, the CNC machining center is also equipped with a tool changing mechanism.

[0004] Existing CNC machining centers usually use a tool arm type tool changing mechanism, which uses a tool changing arm in the form of patent number: CN110039353B, patent name: tool changing arm of automatic tool changing mechanism as the main actuator to change the tool. This tool changing mechanism rotates the tool changing arm to snap the tool changing claw to the side of the tool, and at the same time, the block inside the mechanism is pushed out to the side of the tool, thereby limiting the tool with the block and the tool changing claw at the same time, thereby realizing the grabbing and limiting of the tool, and then the tool can be moved and replaced.

[0005] When the tool is limited in this way, the tool change claw can completely cover and buckle half of the side of the tool when providing the limit to the tool, so the limit is firm. However, on the side where the clamping block and the tool abut, that is, the side where the clamping block and the tool abut, the limit is only limited by the single point of the clamping block, so the limit capacity is relatively weak. Therefore, during the movement and replacement of the tool, the tool will easily fall from this side, resulting in a tool drop accident.

[0006] Although the block can provide a more reliable limiting capability by increasing the force of the resistance between the block and the tool, excessive resistance may cause the side of the tool to deform, thereby affecting the next tool grip and even shortening the service life of the tool.

[0007] Therefore, a five-axis CNC machining center and its tool magazine are proposed. Summary of the invention

[0008] The object of the present invention is to provide a five-axis CNC machining center and a tool magazine thereof, so as to reduce the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A five-axis CNC machining center and its tool magazine, including a machining center body, a driving shaft driven by a motor is arranged in the machining center body, a tool changing arm is fixedly installed on the driving shaft, the tool changing arm has a tool changing claw, the tool changing claw cooperates with the tool through the rotation of the tool changing arm, a snap-fit ​​device is arranged on the tool changing arm, a snap-fit ​​claw is arranged in the snap-fit ​​device, the snap-fit ​​claw cooperates with the tool changing claw to embrace the tool, and a locking device is arranged on the tool changing arm, a clamping claw is arranged in the locking device, and the clamping claw is used to limit the movement of the snap-fit ​​device.

[0011] Based on this scheme, when the CNC machining center of the present invention performs a tool changing operation, the computer system first controls the motor to start and rotate the tool changing arm, so that the tool changing arm engages the tool changing claw with the side of the tool. Subsequently, the engaging device starts and rotates to the other side of the tool, that is, the side of the tool that is not engaged with the tool changing claw, so that the engaging device and the tool changing claw cooperate with each other to embrace the entire side of the tool and clamp the tool. Then, the tool will be pushed downward under the action of the tool push rod in the spindle, so that the tool is released from the spindle. In this process, the tool changing mechanism as a whole will also move accordingly in accordance with the displacement of the tool being pushed downward, so as to ensure that the positional relationship between the tool changing mechanism and the tool is accurate.

[0012] During the overall downward movement of the tool changing mechanism, the locking device will be activated to lock the engaging device onto the tool changing claw, thereby enabling the engaging device and the tool changing claw to stably hold the tool. Therefore, after the tool is grabbed by the tool changing mechanism, all sides of the tool can obtain the same and stable limiting ability without any weak points, thereby ensuring that the tool can be reliably limited when subsequently moved by the tool changing arm. This helps to reduce the risk of tool falling accidents when the CNC machining center interacts with the tool magazine to change tools.

[0013] Preferably, the snap-fitting device includes a snap-fitting claw rotatably mounted on the overhanging end of the tool changing claw, a magnet being fixedly mounted on the end surface of the snap-fitting claw at one end that is not connected to the tool changing claw; an air pump is fixedly mounted on the tool changing arm, an air passage is provided in the tool changing arm, an air bag is fixedly mounted on the end of the tool changing claw, the interior of the air bag is connected to one end of the air passage, and the air pump is connected to the other end of the air passage; the air bag is fixedly connected to the snap-fitting claw.

[0014] With this arrangement, when the tool change arm rotates to snap the tool change claw onto the side of the tool, the computer system will control the air pump to start, so that the air pump extracts the gas stored in the airbag through the airway, and the airbag shrinks under the action of the internal and external pressure difference. During the shrinkage of the airbag, the shrinking airbag will pull the snap claw at the same time, so the snap claw will rotate on the tool change claw, and finally rotate and fit to the side of the tool that is not attached to the tool change claw, so that the snap claw and the tool change claw will cooperate with each other to embrace the entire side of the tool. At this time, the overhanging end of the snap claw, that is, the end of the snap claw that is not connected to the tool change claw, is against the tool change arm, so the magnet will be adsorbed on the tool change arm, thereby ensuring that the snap claw and the tool change claw can stably cooperate to embrace the tool. As a result, when the tool is subsequently moved by the tool change arm, it will be able to obtain reliable limit, so it helps to reduce the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0015] When the tool change is in place, the control system will control the air pump to inflate the airbag, which will then swell, thereby overcoming the magnetic force of the magnet to force the locking claw to rotate, so that the locking claw and the tool change claw are released from the side of the tool. After that, the motor drives the tool change arm to leave the tool under the control of the computer system, and the machining center spindle clamps the tool, completing a tool change process.

[0016] Preferably, the locking device includes a slide groove 1 provided in the tool changing arm, one end of the slide groove 1 is communicated with the outside of the tool changing arm, a claw is slidably installed in the slide groove 1, and a slide groove 2 is provided on the claw; a slide groove 3 is provided at the top of the tool changing arm, the slide groove 3 is communicated with the slide groove 1, a driving rod is movably installed in the slide groove 3, a matching rod is fixedly installed on the driving rod, the matching rod is slidably installed in the slide groove 2, the top end of the driving rod extends out of the slide groove 3, and a limiting block is fixedly installed on the top end of the driving rod, the top end of the limiting block is abutted against the main body of the machining center, a push spring is sleeved on the driving rod, and the two ends of the push spring are respectively abutted against the limit block and the tool changing arm; an inclined surface 1 is provided on the claw, and a slot for accommodating the claw is provided on the snap-fitting claw, and an inclined surface 2 for abutting against the inclined surface 1 is provided in the slot.

[0017] When the magnet is used to fix the engagement claw and the tool-changing claw, although the magnetic force of the magnet can be increased to obtain a reliable effect, the excessively strong magnetic force of the magnet will have effects on the equipment during long-term use, including magnetization of components and circuit interference. At the same time, it will force the air pump to use more power, resulting in additional energy costs. For this reason, a locking device is provided.

[0018] With this arrangement, when the engaging claw cooperates with the tool-changing claw to embrace the tool, during the downward movement of the tool-changing mechanism in coordination with the displacement of the tool, the limit block will always be pressed against the main body of the machining center under the action of the push spring, which means that the driving rod and the matching rod connected to the limit block will remain relatively still with the main body of the machining center. Therefore, during the downward movement of the tool-changing mechanism as a whole, the matching rod will squeeze the second slide slot, thereby forcing the claw to extend outward from the first slide slot. The extended claw will eventually be inserted into the slot, so that the engaging claw is stuck by the claw and cannot rotate relative to the tool-changing claw.

[0019] During this process, the inclined surface 1 on the clamping claw and the inclined surface 2 in the clamping slot will gradually cooperate. Therefore, even if the contact relationship between the locking claw and the tool changing arm is not tight enough under the action of the magnet, the present invention can use the wedge surface cooperation of the inclined surface 1 and the inclined surface 2 to squeeze the locking claw onto the tool changing arm. This can ensure that the contact relationship between the locking claw and the tool changing arm is tight, and the gap between the two can be reduced as much as possible, which is conducive to ensuring that the locking claw and the tool changing claw can provide a stable and reliable clamping effect when embracing the tool, thereby more conducive to making the tool obtain reliable limit, thereby reducing the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0020] Preferably, a matching groove is provided on the inclined surface one, and the matching groove has an inclined surface three. A limiting portion is fixedly installed on the inner side wall of the sliding groove one, and the limiting portion has an inclined surface four, and the inclined surface four is used to cooperate with the inclined surface three.

[0021] When the claw extends from the slide groove one to make the inclined surface one and the inclined surface two cooperate, since there needs to be a tolerance gap between the claw and the slide groove one to ensure the smooth movement of the claw, therefore, when the claw squeezes the inclined surface two through the inclined surface one to try to press the engaging claw against the tool changing arm, the claw itself will also swing in the slide groove one due to the tolerance, which will inevitably reduce the tightness of the abutment relationship between the engaging claw and the tool changing arm, making it difficult to completely ensure that the engaging claw and the tool changing arm are tightly enough abutted.

[0022] With the arrangement of this solution, when the inclined plane 1 cooperates with the inclined plane 2, the inclined plane 3 will also cooperate with the inclined plane 4 at the same time, and on the horizontal plane, the inclined plane 1 and the inclined plane 3 are inclined in opposite directions, that is, the inclined plane 1 and the inclined plane 3 actually form a V-shaped groove structure on one end of the claw extending out of the slide slot 1. Therefore, the cooperation between the inclined plane 3 and the inclined plane 4 will limit the swing of the claw in the slide slot 1, so that the position of the inclined plane 1 can be controlled within a reasonable range, so when the inclined plane 1 and the inclined plane 2 are in contact with each other, the degree of contact between the locking claw and the tool changing arm is also controllable. Therefore, it is beneficial to improve the limiting capacity of the locking device, thereby helping to reduce the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0023] Specifically, when the setting position of the third bevel is determined, the tightness of the contact between the locking claw and the tool change arm can be adjusted by adjusting the setting position of the fourth bevel. The closer the fourth bevel is to the inside of the tool change arm, the closer the position of the clamping claw after swinging in the first slideway will be to the inside of the tool change arm after the third bevel is in contact with the fourth bevel. At this time, under the cooperation of the first bevel and the second bevel, the locking claw and the tool change claw will be closer to the tool change arm when they embrace each other, so that the locking claw and the tool change claw will be more tightly embraced on the tool, and the tool will be more firmly embraced.

[0024] Preferably, a first receiving groove is provided at the end of the tool-changing claw, a second receiving groove is provided on the end of the locking claw connected to the tool-changing claw, and both ends of the airbag are fixedly mounted in the first receiving groove and the second receiving groove respectively.

[0025] With this arrangement, when the airbag contracts so that the snap-fit ​​claw and the tool-changing claw cooperate to embrace the tool, the first storage slot and the second storage slot will be aligned and combined into a large storage slot, and the contracted airbag will be able to be stored in this large storage slot, thereby preventing the airbag from being clamped in the gap between the snap-fit ​​claw and the tool-changing claw. Therefore, on the one hand, the airbag will not be damaged by the snap-fit ​​claw and the tool-changing claw, which is conducive to ensuring the service life of the airbag; on the other hand, the airbag will not invade the matching gap between the snap-fit ​​claw and the tool-changing claw, thereby not affecting the tightness of the snap-fit ​​claw and the tool-changing claw. This is conducive to ensuring that the tool obtains reliable limit of the snap-fit ​​device, and further helps to reduce the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0026] Preferably, a plurality of support frames are evenly and fixedly mounted on the airbag, and all of the support frames are fixedly mounted on the outside of the airbag.

[0027] By providing a support frame, when the airbag is evacuated by the air pump and shrinks, its shrinkage process is limited by the support frame. Specifically, during the shrinkage process, the shrinkage of the airbag in the radial direction is limited by the support frame, so that the airbag is more inclined to shrink in the length direction first, so that the airbag can pull the snap-fit ​​claw more stably and reliably, which is conducive to ensuring that the snap-fit ​​claw can smoothly perform the preset rotation action, thereby improving the reliability of the present invention. In addition, by providing the support frame on the outside of the airbag, the support frame can be used to separate the outer wall of the airbag from hard components such as the snap-fit ​​claw and the tool-changing claw, so as to avoid direct large-area contact between the airbag and these hard components, thereby reducing the risk of damage to the airbag caused by squeezing and friction of the hard components, thereby improving the reliability of the present invention.

[0028] On this basis, the support frame may have an arched portion and a matching portion, and the matching portion is used to abut against the rotating hinge point of the tool changing claw and the locking claw, the first storage groove, and the second storage groove.

[0029] By providing the arched portion, the mechanical bearing capacity of the support frame can be improved when it is hit by components outside the storage grooves 1 and 2, making the support frame less susceptible to damage, thereby ensuring the protection capability of the support frame and improving the reliability of the present invention.

[0030] Preferably, as a tool magazine used in any of the above technical solutions, the tool magazine includes a turntable rotatably mounted on a five-axis CNC machining center, the turntable is driven to rotate by a motor, and a plurality of tool claws for storing tools are evenly arranged on the turntable.

[0031] Through this setting, the rotation of the turntable can be controlled by the computer system to change the position of the tool stored on the claw in the tool magazine, so that the tool change claw can grab the tool stored on the specific claw, so that the machining center can mobilize the appropriate tool as needed. And in the process of changing the tool, the snap-fit ​​device and the tool change claw cooperate with each other to embrace the entire side of the tool and clamp the tool. Then the snap-fit ​​device is locked and fixed on the tool change claw by the locking device, so that the snap-fit ​​device and the tool change claw can stably hold the tool. Therefore, after the tool is grabbed by the tool change mechanism, all sides of it can obtain the same and stable limiting ability, and there is no weak point, so that it can ensure that the tool will be able to obtain reliable limiting when it is subsequently moved by the tool change arm, so it helps to reduce the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. By providing a snap-fit ​​device and a locking device, when the CNC machining center of the present invention performs a tool changing operation, the snap-fit ​​device and the tool changing claw cooperate with each other to embrace the entire side of the tool and clamp the tool. Then, the locking device locks and fixes the snap-fit ​​device on the tool changing claw, so that the snap-fit ​​device and the tool changing claw can stably hold the tool. Therefore, after the tool is grasped by the tool changing mechanism, all sides of the tool can obtain the same and stable limiting ability, and there is no weak point, so that it can ensure that the tool can obtain reliable limiting when it is subsequently moved by the tool changing arm, thereby reducing the risk of tool falling accidents during tool changing.

[0034] 2. By setting the inclined plane 1 and the inclined plane 2, even if the contact relationship between the snap-fit ​​claw and the tool-changing arm is not tight enough under the action of the magnet, the present invention can use the wedge surface of the inclined plane 1 and the inclined plane 2 to squeeze the snap-fit ​​claw onto the tool-changing arm. This can ensure that the contact relationship between the snap-fit ​​claw and the tool-changing arm is tight, and the gap between the two can be reduced as much as possible, which is conducive to ensuring that the snap-fit ​​claw and the tool-changing claw can provide a stable and reliable clamping effect when embracing the tool, thereby more conducive to making the tool obtain reliable limit, thereby reducing the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0035] 3. By providing a support frame, when the airbag is evacuated by the air pump and shrinks, its shrinking process is restricted by the support frame, so that the airbag is more inclined to shrink in the length direction first, so that the airbag can pull the snap-fit ​​claw more stably and reliably, which is conducive to ensuring that the snap-fit ​​claw can smoothly perform the preset rotation action, thereby improving the reliability of the present invention. In addition, by providing the support frame on the outside of the airbag, it is possible to avoid direct large-area contact between the airbag and the external hard components, thereby reducing the risk of damage to the airbag caused by squeezing and friction of the hard components, thereby improving the reliability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the tool changing arm and its upper components;

[0038] Figure 3 for Figure 2 A top view cutaway diagram of ;

[0039] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A;

[0040] Figure 5 for Figure 3 A partial enlarged schematic diagram of part B;

[0041] Figure 6 for Figure 3 Schematic diagram of partial section under CC section;

[0042] Figure 7 for Figure 2 A schematic partial cross-sectional view of the front view;

[0043] Figure 8 for Figure 4 Schematic diagram of the coordination relationship between the airbag and its related structures after the engaging claw and the tool changing claw are engaged;

[0044] Fig. 9 A schematic diagram of the structure of the support frame.

[0045] In the figure: 1. machining center body; 2. driving shaft; 3. tool changing arm; 4. tool changing claw; 5. air pump; 21. driving rod; 22. push spring; 23. limit block; 31. clamping claw; 32. slide slot one; 33. slide slot three; 41. snap-fit ​​claw; 42. air bag; 51. airway; 211. matching rod; 212. slide slot two; 311. inclined plane one; 312. matching slot; 313. inclined plane three; 314. limiting part; 315. inclined plane four; 411. magnet; 412. clamping slot; 413. inclined plane two; 414. storage slot two; 415. storage slot one; 421. support frame; 422. arched part; 423. matching part. DETAILED DESCRIPTION

[0046] The following content will use the drawings listed in the aforementioned "Description of Drawings" section to clearly explain the specific implementation methods of the present invention, in the hope that readers can have a more complete and objective understanding of the working principle of the present invention and the corresponding technical effects.

[0047] like Figures 1 to 9 As shown, a specific implementation of the present invention is shown. Several points need to be explained in advance: First, for the action flow of the CNC machining center, only the necessary explanation of the part related to the present invention is given below, and the specific work flow of the CNC machining center is not repeated; second, the CNC machining center of the present invention is used in conjunction with a matching tool magazine, which includes a turntable rotatably mounted on the five-axis CNC machining center, the turntable is driven to rotate by a motor, and a plurality of tool claws for storing tools are evenly arranged on the turntable; third, the airbag 42 is made of elastic material, such as silicone, rubber and other materials, so that its elastic deformation can be used to improve the movement stability of the present invention and ensure the smooth operation of the present invention.

[0048] When the present invention is installed, first, for the machining center body 1, a driving shaft 2 driven by a motor is arranged in the machining center body 1, and a tool changing arm 3 is fixedly installed on the driving shaft 2, and a tool changing claw 4 is provided on the tool changing arm 3. The tool changing claw 4 cooperates with the tool through the rotation of the tool changing arm 3, and a snap-fit ​​device is provided on the tool changing arm 3, and a snap-fit ​​claw 41 is provided in the snap-fit ​​device. The snap-fit ​​claw 41 cooperates with the tool changing claw 4 to embrace the tool, and a locking device is provided on the tool changing arm 3, and a clamping claw 31 is provided in the locking device. The clamping claw 31 is used to limit the movement of the snap-fit ​​device.

[0049] Among them, the locking device includes a locking claw 41 rotatably mounted on the overhanging end of the tool changing claw 4, and a magnet 411 is fixedly mounted on the end surface of the locking claw 41 that is not connected to the tool changing claw 4; an air pump 5 is fixedly mounted on the tool changing arm 3, an air passage 51 is opened in the tool changing arm 3, an air bag 42 is fixedly mounted on the end of the tool changing claw 4, the interior of the air bag 42 is connected to one end of the air passage 51, and the air pump 5 is connected to the other end of the air passage 51; the air bag 42 is fixedly connected to the locking claw 41.

[0050] The locking device includes a slide groove 1 32 provided in the tool changing arm 3, one end of the slide groove 1 32 is connected to the outer side of the tool changing arm 3, a claw 31 is slidably installed in the slide groove 1 32, and a slide groove 212 is provided on the claw 31; a slide groove 33 is provided on the top of the tool changing arm 3, and the slide groove 33 is connected to the slide groove 1 32, and a driving rod 21 is movably installed in the slide groove 33, and a matching rod 211 is fixedly installed on the driving rod 21, and the matching rod 211 is slidably installed in the slide groove 212, The top end of the movable rod 21 extends out of the slide groove three 33, and the top end of the driving rod 21 is fixedly installed with a limit block 23, the top end of the limit block 23 is against the machining center body 1, and a push spring 22 is sleeved on the driving rod 21, and the two ends of the push spring 22 are respectively against the limit block 23 and the tool changing arm 3; a slope 1 311 is provided on the claw 31, and a slot 412 for accommodating the claw 31 is provided on the snap-fit ​​claw 41, and a slope 2 413 for abutting against the slope 1 311 is provided in the slot 412.

[0051] In addition, a matching groove 312 is provided on the inclined surface 1 311, and the matching groove 312 has an inclined surface 313. A limiting portion 314 is fixedly installed on the inner side wall of the slide groove 1 32, and a limiting portion 315 is provided on the limiting portion 314. The inclined surface 4 315 is used to match with the inclined surface 3 313. A receiving groove 1 415 is provided at the end of the tool changing claw 4, and a receiving groove 2 414 is provided on the end of the snap-fit ​​claw 41 connected to the tool changing claw 4. The two ends of the airbag 42 are respectively fixedly installed in the receiving groove 1 415 and the receiving groove 2 414. A plurality of support frames 421 are evenly fixedly installed on the airbag 42, and all the support frames 421 are fixedly installed on the outside of the airbag 42. The support frame 421 has an arched portion 422 and a matching portion 423, and the matching portion 423 is used to match with the rotating hinge point of the tool changing claw 4 and the snap-fit ​​claw 41, the receiving groove 1 415, and the receiving groove 2 414.

[0052] When the CNC machining center of the present invention is performing a tool changing operation, the computer system first controls the motor to start and rotate the tool changing arm 3, so that the tool changing arm 3 engages the tool changing claw 4 with the side of the tool. Subsequently, the engaging device starts and rotates to the other side of the tool, that is, the side of the tool that is not engaged with the tool changing claw 4, so that the engaging device and the tool changing claw 4 cooperate with each other to embrace the entire side of the tool and clamp the tool. Then, the tool will be pushed downward by the top tool rod in the spindle, so that the tool is released from the spindle. In this process, the tool changing mechanism as a whole will also move accordingly in accordance with the displacement of the tool being pushed downward, so as to ensure the accurate positional relationship between the tool changing mechanism and the tool.

[0053] During the overall downward movement of the tool changing mechanism, the locking device will be activated to lock the engaging device onto the tool changing claw 4, thereby enabling the engaging device and the tool changing claw 4 to stably hold the tool. Therefore, after the tool is grasped by the tool changing mechanism, all sides of the tool can obtain the same and stable limiting ability without any weak points, thereby ensuring that the tool can obtain reliable limiting when it is subsequently moved by the tool changing arm 3, thereby helping to reduce the risk of tool falling accidents when the CNC machining center interacts with the tool magazine to change tools.

[0054] The specific working process of the snapping device is as follows: when the tool changing arm 3 rotates to snap the tool changing claw 4 onto the side of the tool, the computer system will control the air pump 5 to start, so that the air pump 5 extracts the gas stored in the air bag 42 through the air channel 51, and the air bag 42 shrinks under the action of the internal and external pressure difference. During the shrinking process of the air bag 42, the shrinking air bag 42 will pull the snapping claw 41 at the same time, so that the snapping claw 41 will rotate on the tool changing claw 4, and finally rotate and fit to the side of the tool that is not in contact with the tool changing claw 4, so that the snapping claw 41 and the tool changing claw 4 will cooperate with each other to embrace the entire side of the tool. At this time, the overhanging end of the snapping claw 41, that is, the end of the snapping claw 41 that is not connected to the tool changing claw 4, is against the tool changing arm 3, so that the magnet 411 will be adsorbed onto the tool changing arm 3, thereby ensuring that the snapping claw 41 and the tool changing claw 4 can stably cooperate to embrace the tool. As a result, when the tool is subsequently moved by the tool changing arm 3, it will be able to obtain reliable limit, which helps to reduce the risk of tool falling accidents when the CNC machining center interacts with the tool magazine to change tools.

[0055] In addition, when the locking claw 41 cooperates with the tool-changing claw 4 to embrace the tool, the locking device is activated during the downward movement of the tool-changing mechanism in coordination with the displacement of the tool. At this time, under the action of the push spring 22, the limit block 23 will always be pressed against the machining center body 1, which means that the driving rod 21 and the matching rod 211 connected to the limit block 23 will remain relatively still with the machining center body 1. Therefore, during the downward movement of the tool-changing mechanism as a whole, the matching rod 211 will squeeze the second slide groove 212, thereby forcing the claw 31 to extend outward from the first slide groove 32. The extended claw 31 will eventually be inserted into the slot 412, so that the locking claw 41 is stuck by the claw 31 and cannot rotate relative to the tool-changing claw 4.

[0056] In this process, the inclined surface 1 311 on the clamping claw 31 and the inclined surface 2 413 in the clamping groove 412 will gradually cooperate, so even if the contact relationship between the locking claw 41 and the tool changing arm 3 is not tight enough under the action of the magnet 411, the present invention can use the wedge surface cooperation between the inclined surface 1 311 and the inclined surface 2 413 to squeeze the locking claw 41 onto the tool changing arm 3. In this way, the contact relationship between the locking claw 41 and the tool changing arm 3 can be ensured to be tight, and the gap between the two can be reduced as much as possible, which is conducive to ensuring that the locking claw 41 and the tool changing claw 4 can provide a stable and reliable clamping effect when embracing the tool, thereby more conducive to making the tool obtain reliable limit, thereby reducing the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0057] It is worth adding that when the claw 31 extends out from the slide groove 1 32 to make the bevel 1 311 and the bevel 2 413 cooperate, since there needs to be a tolerance gap between the claw 31 and the slide groove 1 32 to ensure the smooth movement of the claw 31, therefore, when the claw 31 squeezes the bevel 2 413 through the bevel 1 311 to try to press the engaging claw 41 close to the tool changing arm 3, the claw 31 itself will also swing in the slide groove 1 32 due to the tolerance, which will inevitably reduce the tightness of the abutment relationship between the engaging claw 41 and the tool changing arm 3, making it difficult to fully ensure that the abutment between the engaging claw 41 and the tool changing arm 3 is sufficiently tight.

[0058] By the arrangement of this solution, when the inclined plane 1 311 cooperates with the inclined plane 2 413, the inclined plane 313 and the inclined plane 4 315 will also cooperate at the same time, and on the horizontal plane, the inclined plane 1 311 and the inclined plane 3 313 are inclined in opposite directions, that is, the inclined plane 1 311 and the inclined plane 3 313 actually form a V-shaped groove structure on one end of the claw 31 extending out of the slide slot 1 32. Therefore, the cooperation between the inclined plane 313 and the inclined plane 4 315 will limit the swing of the claw 31 in the slide slot 1 32, so that the position of the inclined plane 1 311 can be controlled within a reasonable range, so when the inclined plane 1 311 and the inclined plane 2 413 are in contact with each other, the degree of contact between the locking claw 41 and the tool changing arm 3 is also controllable. Therefore, it is beneficial to improve the limiting capacity of the locking device, thereby helping to reduce the risk of tool drop accidents when the CNC machining center interacts with the tool magazine to change tools.

[0059] After the snap-fit ​​device and the locking device have finished their actions, the tool-changing arm 3 rotates under the drive of the motor to move the tool. When the tool is changed and moved into place, the tool-changing mechanism moves upward as a whole, so that the push spring 22 will be recompressed, and with the cooperation of the matching rod 211 and the second slide groove 212, the clamping claw 31 will be retracted into the first slide groove 32, so that the clamping claw 31 no longer limits the snap-fit ​​claw 41. After that, the control system will control the air pump 5 to inflate the airbag 42, and the airbag 42 will swell at this time, thereby overcoming the magnetic force of the magnet 411 to force the snap-fit ​​claw 41 to rotate, so that the snap-fit ​​claw 41 and the tool-changing claw 4 are released from the embracing state of the side of the tool. After that, the motor drives the tool-changing arm 3 to leave the tool under the control of the computer system, and the spindle of the machining center clamps the tool, thus completing a tool-changing process.

[0060] It should be emphasized that, based on the contents recorded in the above text, although the beneficial effects of the present invention have been elaborated in detail and corresponding specific implementation methods have been provided for this purpose, ordinary technicians in this field can still make conventional substitutions, deformations, etc. based on the given technical solutions without creative labor to achieve the same technical effects, based on the full understanding of the working principle of the present invention, but this should not be considered to exceed the scope of the present invention. Specifically, the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A five-axis CNC machining center, comprising a machining center body (1), wherein a drive shaft (2) driven by a motor is arranged in the machining center body (1), a tool changing arm (3) is fixedly mounted on the drive shaft (2), and a tool changing claw (4) is provided on the tool changing arm (3), and the tool changing claw (4) cooperates with a tool by rotating the tool changing arm (3), characterized in that: The tool changing arm (3) is provided with a snap-fit ​​device, a snap-fit ​​claw (41) is provided inside the snap-fit ​​device, and the snap-fit ​​claw (41) cooperates with the tool changing claw (4) to embrace the tool. The tool changing arm (3) is provided with a locking device, a clamping claw (31) is provided inside the locking device, and the clamping claw (31) is used to limit the movement of the snap-fit ​​device.

2. A five-axis CNC machining center according to claim 1, characterized in that: The locking device comprises a locking claw (41) rotatably mounted on the overhanging end of the tool changing claw (4); a magnet (411) is fixedly mounted on the end surface of the locking claw (41) at one end not connected to the tool changing claw (4); an air pump (5) is fixedly mounted on the tool changing arm (3); an air passage (51) is provided in the tool changing arm (3); an air bag (42) is fixedly mounted on the end of the tool changing claw (4); the interior of the air bag (42) is communicated with one end of the air passage (51); the air pump (5) is connected to the other end of the air passage (51); and the air bag (42) is fixedly connected to the locking claw (41).

3. A five-axis CNC machining center according to claim 2, characterized in that: The locking device comprises a slide groove (32) provided in the tool changing arm (3), one end of the slide groove (32) being connected to the outer side of the tool changing arm (3), a clamping claw (31) being slidably installed in the slide groove (32), and a slide groove (212) being provided on the clamping claw (31); a slide groove (33) being provided at the top of the tool changing arm (3), and the slide groove (33) being connected to the slide groove (32), and a driving rod (21) being movably installed in the slide groove (33), and a matching rod (211) being fixedly installed on the driving rod (21), and the matching rod (211) being slidably installed in the slide groove (212), and the matching rod (211) being slidably installed in the slide groove (212). The top end of the driving rod (21) extends out of the sliding groove three (33), and a limit block (23) is fixedly installed on the top end of the driving rod (21), and the top end of the limit block (23) abuts against the main body (1) of the machining center. A push spring (22) is sleeved on the driving rod (21), and the two ends of the push spring (22) respectively abut against the limit block (23) and the tool changing arm (3); the clamping claw (31) is provided with an inclined surface one (311), and the locking claw (41) is provided with a slot (412) for accommodating the clamping claw (31), and the slot (412) is provided with an inclined surface two (413) for abutting against the inclined surface one (311).

4. A five-axis CNC machining center according to claim 3, characterized in that: The first inclined surface (311) is provided with a matching groove (312), and the matching groove (312) has a third inclined surface (313). A limiting portion (314) is fixedly installed on the inner side wall of the first sliding groove (32), and the limiting portion (314) has a fourth inclined surface (315), and the fourth inclined surface (315) is used to cooperate with the third inclined surface (313).

5. The five-axis CNC machining center according to claim 2, characterized in that: A first receiving groove (415) is provided at the end of the blade changing claw (4), a second receiving groove (414) is provided at the end of the locking claw (41) connected to the blade changing claw (4), and two ends of the air bag (42) are respectively fixedly mounted in the first receiving groove (415) and the second receiving groove (414).

6. A five-axis CNC machining center according to claim 2, characterized in that: A plurality of support frames (421) are evenly and fixedly mounted on the airbag (42), and all of the support frames (421) are fixedly mounted on the outside of the airbag (42).

7. A five-axis CNC machining center according to claim 6, characterized in that: The support frame (421) has an arched portion (422) and a matching portion (423), and the matching portion (423) is used to abut against the rotating hinge point of the tool changing claw (4) and the locking claw (41), the first storage groove (415), and the second storage groove (414).

8. A tool magazine, characterized in that: The tool magazine is applied to any one of the five-axis CNC machining centers described in claims 1 to 7, and the tool magazine includes a turntable rotatably mounted on the five-axis CNC machining center, the turntable is driven to rotate by a motor, and a plurality of tool claws for storing tools are evenly arranged on the turntable.

Images