Automatic tool changing and lengthening device for main shaft of heavy numerical control floor type boring machine

Abstract

The utility model relates to a heavy numerical control floor type boring machine main shaft automatic tool changing and lengthening device belongs to machining technical field. The utility model solves the problem of long time of main shaft interference and tool changing when heavy numerical control floor type boring machine processes steam turbine rotor wheel groove. Including device body, end face key, four petal broach claw, lengthening link, lengthening draw, spring assembly and apron, the front end of device body is equipped with end face key, the rear end of device body is installed on floor type boring machine main shaft, device body is equipped with installation channel, four petal broach claw, lengthening link and lengthening draw are all slidingly installed in installation channel, the draw of four petal broach claw front end and handle rear end is connected, the rear end of four petal broach claw is connected with the front end of lengthening draw through lengthening link, the rear end of lengthening draw is connected with the broach claw in floor type boring machine main shaft. The utility model is used for connecting floor type boring machine main shaft and handle, and the diameter size of its front end is less than the diameter size of main shaft, can adapt to the working scene of specific requirement.

Description

Technical Field

[0001] This utility model relates to the technical field of machining, and in particular to an automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine. Background Technology

[0002] Heavy-duty CNC floor-type boring machines possess powerful machining capabilities, primarily used for machining holes and end faces of large shell and box-type parts, with spindle diameters ranging from Φ200-260 mm. Due to the high precision of the heavy-duty CNC floor-type boring machine spindle, it can also machine wheel grooves on large steam turbine rotors. However, because of the large spindle diameter and the typical 200-500 mm distance between turbine rotor discs, directly mounting the wheel groove end mill on the heavy-duty CNC floor-type boring machine spindle causes interference between the end mill and adjacent rotor discs during groove machining, creating machining difficulties. Using an extended tool holder to mount the wheel groove end mill requires removing and reinstalling the extended tool holder from the heavy-duty CNC floor-type boring machine spindle each time a tool is changed, making it difficult to control repeatability and positioning accuracy. Tool changes consume significant machining time, severely impacting machining accuracy and efficiency. Utility Model Content

[0003] To address the problem of interference between the spindle and the wheel disc when machining turbine rotor grooves on a heavy-duty CNC floor-type boring machine, and the problem of long tool change time caused by using extended tool holders, the purpose of this utility model is to provide an automatic tool change and extension device for the spindle of a heavy-duty CNC floor-type boring machine.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An automatic tool change and extension device for a heavy-duty CNC floor-type boring machine spindle includes: a device body 1, end face keys 2, four-lobed drawbars 3, an extension rod 4, an extension tie 5, a spring assembly 6, and a cover plate 7. At least two end face keys 2 are mounted on the front end face of the device body 1, serving to connect to the tool holder and limit its movement. The rear end face of the device body 1 is mounted on the front end face of the floor-type boring machine spindle 8. The device body 1 has a through-type mounting channel 9, the axis of which coincides with the axis of the floor-type boring machine spindle 8. The four-lobed drawbars 3 and the extension rod 4 are slidably mounted on the cover plate. The four-lobed puller claw 3 is connected to the pull stud 10 at the rear end of the tool holder; the rear end of the four-lobed puller claw 3 is connected to the front end of the extension rod 4; the rear end of the extension rod 4 extends into the mounting hole 801 of the floor boring machine spindle 8 and is connected to the front end of the extended pull stud 5; the rear end of the extended pull stud 5 is connected to the puller claw inside the floor boring machine spindle 8; the spring assembly 6 and the cover plate 7 are both sleeved on the outer periphery of the extension rod 4; the cover plate 7 is installed on the rear end face of the device body 1 and covers the mounting channel 9; the outer wall of the extension rod 4 is provided with a limiting protrusion, which is located between the spring assembly 6 and the cover plate 7.

[0006] Furthermore, each of the end face keys 2 is mounted on the device body 1 by a first screw 11.

[0007] Furthermore, the device body 1 is mounted on the spindle 8 of the floor boring machine by a plurality of second screws 12.

[0008] Furthermore, the cover plate 7 is mounted on the device body 1 by a plurality of third screws 13.

[0009] Furthermore, the mounting channel 9 includes a first channel 901, a second channel 902, a third channel 903, and a fourth channel 904 connected sequentially from front to back. The first channel 901 is used to accommodate the tool holder. When the four-lobed puller 3 moves along the axial direction of the mounting channel 9, its front end is radially open in the second channel 902 and gradually radially contracts as it enters the third channel 903. The spring assembly 6 and the limiting protrusion are both located in the fourth channel 904.

[0010] Furthermore, the device body 1 includes a straight cylindrical part 101, a middle part 102 and a connecting part 103 connected sequentially from front to back. The diameter of the cross section of the straight cylindrical part 101 is smaller than the diameter of the cross section of the floor boring machine spindle 8. The rear end face of the connecting part 103 is provided with a groove 1031, and the front end of the floor boring machine spindle 8 is placed in the groove 1031.

[0011] Furthermore, the cross-sectional diameter of the straight section 101 is 130 mm.

[0012] Furthermore, the spring assembly 6 consists of multiple butterfly springs.

[0013] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies:

[0014] (1) This utility model is matched and installed with the spindle of a heavy-duty CNC floor boring machine, and the milling cutter holder can be installed quickly. Compared with using an extended tool holder to install a wheel groove milling cutter, it has the advantages of simple operation, accurate positioning and short tool change time. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to this utility model.

[0016] In the attached diagram: 1. Device body; 101. Straight cylinder; 102. Middle section; 103. Connecting section; 1031. Groove; 2. End face key; 3. Four-lobed puller claw; 4. Extension rod; 5. Extended pull stud; 6. Spring assembly; 7. Cover plate; 8. Floor-type boring machine spindle; 801. Mounting hole; 9. Mounting channel; 901. First channel; 902. Second channel; 903. Third channel; 904. Fourth channel; 10. Pull stud; 11. First screw; 12. Second screw; 13. Third screw. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and not intended to limit the scope of the present utility model. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the present utility model.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] Please refer to Figure 1 As shown, an automatic tool changer and extension device for a heavy-duty CNC floor-type boring machine spindle is illustrated, comprising: a device body 1, end face keys 2, four-lobed broaches 3, extension rods 4, extension rivets 5, spring assemblies 6, and a cover plate 7. At least two end face keys 2 are mounted on the front end face of the device body 1; the rear end face of the device body 1 is mounted on the front end face of the floor-type boring machine spindle 8; the device body 1 has a through-type mounting channel 9, the axis of which coincides with the axis of the floor-type boring machine spindle 8; the four-lobed broaches 3 and the extension rods 4 are slidably mounted within the mounting channel 9; The front end of the four-lobed puller claw 3 is connected to the pull stud 10 at the rear end of the tool holder; the rear end of the four-lobed puller claw 3 is connected to the front end of the extension rod 4; the rear end of the extension rod 4 extends into the mounting hole 801 of the spindle 8 of the floor boring machine and is connected to the front end of the extended pull stud 5; the rear end of the extended pull stud 5 is connected to the puller claw inside the spindle 8 of the floor boring machine; the spring assembly 6 and the cover plate 7 are both sleeved on the outer periphery of the extension rod 4; the cover plate 7 is installed on the rear end face of the device body 1 and covers the mounting channel 9; the outer wall of the extension rod 4 is provided with a limiting protrusion, which is located between the spring assembly 6 and the cover plate 7.

[0020] Furthermore, in a preferred embodiment, each end face key 2 is mounted on the device body 1 by a first screw 11; more preferably, the first screw 11 is an M12 socket head cap screw.

[0021] Furthermore, in a preferred embodiment, the device body 1 is mounted on the spindle 8 of the floor boring machine by a plurality of second screws 12; more preferably, the second screws 12 are M20 socket head cap screws.

[0022] Furthermore, in a preferred embodiment, the cover plate 7 is mounted on the device body 1 by a plurality of third screws 13; more preferably, the third screws 13 are M6 socket head cap screws.

[0023] Furthermore, in a preferred embodiment, the mounting channel 9 includes a first channel 901, a second channel 902, a third channel 903, and a fourth channel 904 connected sequentially from front to back. The first channel 901 is used to accommodate the tool holder. When the four-lobed puller 3 moves axially along the mounting channel 9, its front end is radially open in the second channel 902 and gradually radially contracts as it enters the third channel 903. The spring assembly 6 and the limiting protrusion are both located in the fourth channel 904. The limiting protrusion is arranged circumferentially along the extension rod 4. Spring assembly 6 is a compression spring assembly. The rear end of spring assembly 6 abuts against the limiting protrusion and applies a pushing force to the limiting protrusion. When the rear end of the limiting protrusion abuts against the cover plate 7, the four-lobed puller claw 3 is completely located in the third channel 903 and tightens the pull pin 10 at the rear end of the handle. When the extension rod 4 moves forward, spring assembly 6 is further compressed. At the same time, the front end of the four-lobed puller claw 3 gradually enters the second channel 902 from the third channel 903. During this process, the four-lobed puller claw 3 gradually opens. After reaching the designated position, the handle can be removed.

[0024] Furthermore, in a preferred embodiment, the first channel 901 is a tapered channel that can be fitted with an ISO50 tapered shank.

[0025] Furthermore, in a preferred embodiment, the four-lobed puller 3 includes lobes, a connecting seat, and a spring. The front end of the connecting seat has four lobes evenly distributed on its outer periphery. The spring surrounds the rear end of the four lobes and mounts the four lobes on the connecting seat. The rear end of the connecting seat is provided with an external thread, and the front end of the extension rod 4 is provided with an internal thread hole. The external thread matches the internal thread hole.

[0026] Furthermore, in a preferred embodiment, the four-lobed broach 3 is identical in structure to the broach pawl in the spindle 8 of a floor-type boring machine.

[0027] Furthermore, in a preferred embodiment, the front end of the extended rivet 5 is provided with an external thread, and the rear end of the extension rod 4 is provided with an internal thread hole, the external thread matching the internal thread hole.

[0028] When in operation, this utility model needs to be installed on the spindle 8 of a floor-type boring machine. The specific steps are as follows: First, the extended pull stud 5 is inserted into the mounting hole 801 of the spindle 8 of the floor-type boring machine and reaches the pull claw of the spindle 8 of the floor-type boring machine. Then, the device body 1 is fixed to the spindle 8 of the floor-type boring machine by multiple second screws 12.

[0029] The specific steps for installing the tool holder are as follows: Insert the pull pin 10 at the rear end of the tool holder into the first channel 901 and gradually into the second channel 902 until it reaches the open four-lobed puller jaw 3. Then, by controlling the cylinder of the floor-type boring machine spindle 8, the puller jaw inside the spindle 8 drives the extended pull pin 5 to move backward. The extended pull pin 5 drives the extension rod 4 to move backward, and the extension rod 4 drives the four-lobed puller jaw 3 to move backward. The front end of the four-lobed puller jaw 3 gradually retracts radially as it enters the third channel 903. When it is fully inside the third channel 903, the tool holder is secured. During this process, the thrust applied by the spring assembly 6 to the limiting protrusion assists the extension rod 4 in achieving rapid reset.

[0030] It should be noted that the spindle 8 of the floor-type boring machine itself has the function of automatically releasing or clamping the tool holder. The rear end of the spindle 8 is a cylinder structure, which uses compressed air to drive the movement of the pull pawl. This structure is existing technology. However, this utility model connects the tool holder to the spindle 8 of the floor-type boring machine, which can also achieve automatic release and clamping of the tool holder. Specifically, the extended pull stud 5 is connected to the pull pawl inside the spindle 8 of the floor-type boring machine. The movement of this pull pawl is controlled by the cylinder, which in turn drives the extended pull stud 5 to move, thereby driving the four-lobed pull pawl 3 to release or clamp the tool holder.

[0031] Furthermore, in a preferred embodiment, the device body 1 includes a straight cylindrical portion 101, a middle portion 102, and a connecting portion 103 connected sequentially from front to back. The diameter of the cross-section of the straight cylindrical portion 101 is smaller than the diameter of the cross-section of the floor boring machine spindle 8. The rear end face of the connecting portion 103 is provided with a stop groove 1031, and the front end of the floor boring machine spindle 8 is placed in the groove 1031.

[0032] Furthermore, in a preferred embodiment, the cross-sectional diameter of the straight cylindrical portion 101 is 130 mm. The distance between the turbine rotor discs is generally between 200-500 mm, and the diameter of the straight cylindrical portion 101 is smaller than the distance between the turbine rotor discs, so that the straight cylindrical portion 101 can extend into the space between the turbine rotor discs to work.

[0033] Furthermore, in a preferred embodiment, the spring assembly 6 consists of multiple disc springs. Disc springs have a small dimension in the load-bearing direction, enabling them to withstand large loads with minimal deformation and occupying little axial space.

[0034] Working principle:

[0035] To address the issue of the relatively thick spindle 8 of the heavy-duty CNC floor-type boring machine, an extension device with an end diameter of 130mm was designed. This extension device has an end face key 2 at its end, and the device body 1 is internally machined with a 7:24 ISO50 internal taper, i.e., the first channel 901, which can accommodate an ISO50 taper shank. The taper shank also has an internal taper, allowing for the installation of a wheel groove milling cutter with a corresponding taper. To ensure that the ISO50 internal taper is coaxial with the heavy-duty CNC floor-type boring machine spindle 8, the tail of the device body 1 has a stop, i.e., a groove 1031, that matches the heavy-duty CNC floor-type boring machine spindle 8. The coaxiality of this stop with the ISO50 spindle internal taper on the device body 1 is controlled within 0.02mm. This ensures that after the heavy-duty CNC floor-type boring machine spindle 8 is fitted with this extension device, the ISO50 on the device body 1 is coaxial with the heavy-duty CNC floor-type boring machine spindle 8. Use multiple M20 socket head cap screws to tighten the main body 1 of the device to the spindle 8 of the heavy-duty CNC floor boring machine.

[0036] To solve the problem of automatically tightening the taper shank, a four-lobed broach 3 is installed in the mounting channel 9. This four-lobed broach 3, via the pull stud 10 at the tail of the ISO50 taper shank, enables the ISO50 taper shank to be ejected and tightened, thus achieving automatic tool changing. The four-lobed broach 3 is connected to the broach inside the spindle 8 of a heavy-duty CNC floor-type boring machine via an extended pull stud 5 mounted on an extension rod 4. During operation, the broach inside the spindle 8 of the heavy-duty CNC floor-type boring machine tightens or ejects the extended pull stud 5, thereby moving the extension rod 4, which in turn moves the four-lobed broach 3, ultimately achieving the tightening or ejection of the ISO50 taper shank. To ensure flexible movement of the extension rod 4, multiple disc-shaped spring plates are installed between the device body 1 and the extension rod 4, fixed by a cover plate 7, allowing the extension rod 4 to quickly return to its original position after being ejected by the broach of the spindle 8 of the heavy-duty CNC floor-type boring machine.

[0037] In summary, this utility model is simple to operate, accurate in positioning, and has a short tool change time, effectively solving the problems of spindle interference and long tool change time when machining turbine rotor grooves on heavy-duty CNC floor-type boring machines.

[0038] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutation and combination. Therefore, this utility model will not describe the permutation and combination technical solutions one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by this utility model.

[0039] This embodiment is merely an exemplary description of this patent and does not limit its scope of protection. Those skilled in the art can make partial changes to it, as long as they do not exceed the spirit and essence of this patent, they are all within the scope of protection of this patent.

Claims

1. An automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine, characterized in that: The device includes a main body (1), end face keys (2), four-lobed broaches (3), extension rods (4), extension rivets (5), spring assemblies (6), and a cover plate (7). At least two end face keys (2) are mounted on the front end face of the main body (1); the rear end face of the main body (1) is mounted on the front end face of the spindle (8) of a floor-type boring machine; the main body (1) has a through-type mounting channel (9), the axis of which coincides with the axis of the spindle (8) of the floor-type boring machine; the four-lobed broaches (3) and the extension rod (4) are slidably mounted within the mounting channel (9); the front end of the four-lobed broaches (3) and the rear end of the tool holder... The pull stud (10) is connected; the rear end of the four-lobed puller claw (3) is connected to the front end of the extension rod (4); the rear end of the extension rod (4) extends into the mounting hole (801) of the spindle (8) of the floor boring machine and is connected to the front end of the extended pull stud (5); the rear end of the extended pull stud (5) is connected to the puller claw in the spindle (8) of the floor boring machine; the spring assembly (6) and the cover plate (7) are both sleeved on the outer periphery of the extension rod (4); the cover plate (7) is installed on the rear end face of the device body (1) and covers the mounting channel (9); the outer wall of the extension rod (4) is provided with a limiting protrusion, which is located between the spring assembly (6) and the cover plate (7).

2. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 1, characterized in that: Each of the end face keys (2) is mounted on the device body (1) by a first screw (11).

3. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 1, characterized in that: The device body (1) is mounted on the spindle (8) of the floor boring machine by a plurality of second screws (12).

4. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 1, characterized in that: The cover plate (7) is mounted on the device body (1) by a plurality of third screws (13).

5. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 1, characterized in that: The mounting channel (9) includes a first channel (901), a second channel (902), a third channel (903), and a fourth channel (904) connected sequentially from front to back. The first channel (901) is used to accommodate the knife handle. When the four-lobed puller (3) moves along the axial direction of the mounting channel (9), its front end is radially open in the second channel (902) and gradually radially contracts as it enters the third channel (903). The spring assembly (6) and the limiting protrusion are both placed in the fourth channel (904).

6. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 1, characterized in that: The device body (1) includes a straight cylindrical part (101), a middle part (102) and a connecting part (103) connected from front to back. The diameter of the cross section of the straight cylindrical part (101) is smaller than the diameter of the cross section of the floor boring machine spindle (8). The rear end face of the connecting part (103) is provided with a groove (1031), and the front end of the floor boring machine spindle (8) is placed in the groove (1031).

7. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 6, characterized in that: The cross-sectional diameter of the straight section (101) is 130 mm.

8. The automatic tool changer and extension device for the spindle of a heavy-duty CNC floor-type boring machine according to claim 1, characterized in that: The spring assembly (6) consists of multiple butterfly springs.

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