Four-axis tapping structure of vertical machining center

Abstract

The invention discloses a four-axis tapping structure of a vertical machining center, and belongs to the technical field of tapping structures. The clamping unit is rotationally connected to the rack; the rotating unit is rotationally connected to the surface of the rack and is in sliding connection with the end part of the clamping unit; the rotating unit is rotationally connected to the rack, and a tapping unit is installed at the end of the rotating unit; and the lifting unit is slidably connected to the surface of the rotating unit. When the rotating unit is started, the rotating unit can drive the tapping unit to rotate, and the lifting unit can drive the tapping unit to slide up and down in a reciprocating mode under the cooperation of the rotating unit. The clamping units can conduct periodic clamping and opening under the cooperation of the rotating unit, when the clamping units clamp and fix the workpieces, the tapping units can conduct tapping on the workpieces, when the tapping units finish tapping on the workpieces, the clamping units can be automatically opened, meanwhile, the tapping units can conduct tapping on the workpieces in the next clamping unit, and therefore the workpieces in the next clamping unit can be clamped and opened. The tapping machine has the advantage of high tapping efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tapping structures, in particular to a four-axis tapping structure of a vertical machining center. Background Art

[0002] A Chinese patent (publication number: CN117754301B) discloses a four-axis tapping structure of a vertical machining center, including a base, a column fixedly connected to the side of the base, and a spindle box slidably connected to the surface of the column up and down; in the process of using the four-axis vertical machining center to drill and tap the workpiece, this patent uses a cleaning port and a blowing port to clean the surface of the workpiece and the iron chips in the drilled hole. The cleaning port will suck in the iron chips on the surface of the workpiece, which is beneficial to cleaning the iron chips on the surface of the workpiece. Then the blowing port will move to the surface of the workpiece, and the wind blown by the fan will be blown out through the blowing pipe and the blowing port. When the blowing port moves to the position of drilling holes on the surface of the workpiece, the wind blown out of the blowing port will blow out the iron chips in the hole, which is beneficial to automatically clean the surface of the workpiece and the iron chips in the hole on the surface of the workpiece when the machining tool is replaced during drilling holes on the surface of the workpiece, thereby reducing the influence of iron chips on tapping subsequent holes.

[0003] The four-axis tapping structure of the vertical machining center in the above technical solution also has the following defects when in use: after the four-axis tapping structure taps the workpiece, a new workpiece needs to be manually replaced for the next tapping, so the frequent replacement of the workpiece reduces the tapping efficiency. Therefore, it is necessary to provide a four-axis tapping structure of a vertical machining center to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of an embodiment of the present invention is to provide a four-axis tapping structure for a vertical machining center to solve the problems in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A four-axis tapping structure for a vertical machining center, comprising: frame; A clamping unit, rotatably connected to the frame, for clamping and fixing the workpiece; The rotating unit is rotatably connected to the surface of the frame and is slidably connected to the end of the clamping unit, and is used to cooperate with the clamping unit to realize the opening and closing of the clamping unit; A rotating unit is rotatably connected to the frame, and a tapping unit is installed at the end thereof, which is used to drive the tapping unit to rotate, thereby realizing the tapping of the workpiece; The lifting unit is slidably connected to the surface of the rotating unit and is used to cooperate with the rotating unit to realize the lifting and lowering of the tapping unit.

[0006] As a preferred technical solution of the present invention, the clamping unit includes: a workbench, rotatably connected to the frame, and the surface of the workbench is slidably connected to three groups of sliding frames; a rotating shaft, fixed on the three groups of sliding frames, and the surface of the rotating shaft is rotatably connected to two groups of clamping members; a tripod, fixed at the center position of the side of the workbench.

[0007] As a preferred technical solution of the present invention, the rotating unit includes: a driving member installed on a frame; a driving shaft rotatably connected to the frame, one end of which is connected to the output end of the driving member, and the other end of which is connected to the center of the workbench; a circular ring fixed to the frame, and the inner wall of which is respectively slidably connected to the end of the sliding frame away from the rotating shaft and the surface of the workbench; a convex member connected to the inner wall of the circular ring, and the surface of which is slidably connected to the end of the sliding frame away from the rotating shaft; a V-shaped groove opened on the workbench; a sliding column fixed to the clamping member, and the end of which is slidably connected in the V-shaped groove; a guide member fixed to the sliding frame, and the end of which is slidably connected in the slide groove on the surface of the workbench, and the guide member is connected to the inner wall of the slide groove through an elastic object.

[0008] As a preferred technical solution of the present invention, the rotating unit includes: a support frame connected to the frame and a driver installed on the side; a rotating cylinder rotatably connected to the support frame and an end connected to the output end of the driver; a rotating rod slidably connected to the inside of the rotating cylinder and a tapping unit installed at the end away from the rotating cylinder.

[0009] As a preferred technical solution of the present invention, the lifting unit includes: a fixed frame, connected to the side of the supporting frame, and having at least two groups of positioning grooves on the surface; a sliding block, one side of which is slidably connected to the inside of the positioning groove, and the surface of the rotating cylinder is rotatably connected to the inside of the sliding block; an elastic member, connected between the side of the sliding block and the side of the supporting frame; a sliding member, connected to the side of the sliding block through a connecting rod, and the surface of the rotating rod is rotatably connected to the inside of the sliding member; an arc groove, opened on the surface of the rotating cylinder; a vertical groove, opened on the surface of the rotating cylinder, and the two ends are respectively connected to the two ends of the arc groove; a sliding shaft, fixed on the sliding block, and the end is slidably connected to the inside of the arc groove and the vertical groove.

[0010] As a preferred technical solution of the present invention, the surface of the rotating rod and the interior of the rotating cylinder are connected through a spline shaft and a spline sleeve, and a rotating wheel is installed on the surface of the rotating rod, and the rotating wheel is rotatably connected inside the sliding member.

[0011] As a preferred technical solution of the present invention, the tapping unit includes: a first gear installed on the surface of a rotating rod; a tap rotatably connected in a sliding member, and the taps are installed in four groups; a second gear installed on the surface of the tap and meshingly connected with the first gear.

[0012] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: when tapping a workpiece, the present invention places the workpiece in the clamping unit and turns on the rotating unit. The rotating unit can drive the tapping unit to rotate, and the lifting unit can drive the tapping unit to slide back and forth up and down with the cooperation of the rotating unit, so that the tapping unit can tap the workpiece.

[0013] Compared with the prior art in which the workpiece needs to be manually replaced with a new workpiece for the next tapping after the tapping is completed, the embodiment of the present invention provides a rotating unit and a clamping unit. The rotating unit is turned on, and the clamping unit will periodically clamp and open with the cooperation of the rotating unit. When the clamping unit clamps and fixes the workpiece, the tapping unit can tap the workpiece. When the tapping unit completes tapping the workpiece, the clamping unit can automatically open, and at the same time, the tapping unit will tap the workpiece in the next group of clamping units, which is convenient for rapid replacement of workpieces and has the advantage of high tapping efficiency.

[0014] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic diagram of the overall structure of a four-axis tapping structure of a vertical machining center provided by an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the rotating unit provided in an embodiment of the present invention.

[0017] Figure 3 for Figure 1 A partial enlarged view of part A.

[0018] Figure 4 It is a schematic diagram of the structure of the lifting unit provided in an embodiment of the present invention.

[0019] 1. Frame; 2. Clamping unit; 21. Workbench; 22. Sliding frame; 23. Rotating shaft; 24. Clamping member; 25. Tripod; 3. Rotating unit; 31. Driving member; 32. Driving shaft; 33. Ring; 34. Convex member; 35. V-shaped groove; 36. Sliding column; 37. Guide member; 4. Rotating unit; 41. Support frame; 42. Driver; 43. Rotating cylinder; 44. Rotating rod; 5. Lifting unit; 51. Fixed frame; 52. Sliding block; 53. Sliding member; 54. Connecting rod; 55. Arc groove; 56. Vertical groove; 57. Sliding shaft; 58. Elastic member; 59. Positioning groove; 6. Tapping unit; 61. First gear; 62. Tap; 63. Second gear. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0022] See also Figure 1 to Figure 4 , a four-axis tapping structure of a vertical machining center, comprising: Rack 1; The clamping unit 2 is rotatably connected to the frame 1 and is used to clamp and fix the workpiece; The rotating unit 3 is rotatably connected to the surface of the frame 1 and is slidably connected to the end of the clamping unit 2, and is used to cooperate with the clamping unit 2 to realize the opening and closing of the clamping unit 2; The rotating unit 4 is rotatably connected to the frame 1, and a tapping unit 6 is installed at the end thereof, so as to drive the tapping unit 6 to rotate, thereby realizing the tapping of the workpiece; The lifting unit 5 is slidably connected to the surface of the rotating unit 4 and is used to cooperate with the rotating unit 4 to realize the lifting and lowering of the tapping unit 6.

[0023] In one embodiment of the present invention, when tapping a workpiece, the workpiece is placed in the clamping unit 2, and the rotating unit 4 is turned on. The rotating unit 4 can drive the tapping unit 6 to rotate, and the lifting unit 5 can drive the tapping unit 6 to slide up and down in cooperation with the rotating unit 4. The rotating unit 3 is turned on, and the clamping unit 2 can periodically clamp and open in cooperation with the rotating unit 3. When the clamping unit 2 clamps and fixes the workpiece, the tapping unit 6 can tap the workpiece. When the tapping unit 6 completes tapping the workpiece, the clamping unit 2 can automatically open, and the tapping unit 6 will tap the workpiece in the next group of clamping units 2, which is convenient for rapid replacement of workpieces and has the advantage of high tapping efficiency.

[0024] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the clamping unit 2 comprises: A workbench 21 is rotatably connected to the frame 1, and three sets of sliding frames 22 are slidably connected to the surface of the workbench 21; The rotating shaft 23 is fixed on the three sets of sliding frames 22, and the surface of the rotating shaft 23 is rotatably connected with two sets of clamping members 24; The tripod 25 is fixed at the center of the side of the workbench 21 .

[0025] In this embodiment, when tapping the workpiece, the workpiece is first placed between the two groups of clamps 24, and the rotating unit 3 is turned on. The rotating unit 3 can drive the two groups of clamps 24 to rotate to the bottom of the tapping unit 6 through the workbench 21, and at the same time, the sliding frame 22 will slide toward the direction close to the tripod 25 under the action of the rotating unit 3. When sliding, the sliding frame 22 can drive the two groups of clamps 24 to slide synchronously through the rotating shaft 23, so that the two groups of clamps 24 push the workpiece to contact the side of the tripod 25, and the two groups of clamps 24 will rotate close to each other on the surface of the rotating shaft 23 under the action of the rotating unit 3, so that the two groups of clamps 24 are in close contact with the surface of the workpiece, so the workpiece will be clamped and fixed under the joint action of the two groups of clamps 24 and the tripod 25, which is convenient for the tapping unit 6 to tap the workpiece.

[0026] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the rotating unit 3 includes: A driving member 31 is mounted on the frame 1; A driving shaft 32 is rotatably connected to the frame 1, one end of which is connected to the output end of the driving member 31, and the other end of which is connected to the center of the workbench 21; The ring 33 is fixed on the frame 1, and the inner wall thereof is slidably connected to the end of the sliding frame 22 away from the rotating shaft 23 and the surface of the workbench 21; The convex member 34 is connected to the inner wall of the ring 33, and its surface is slidably connected to the end of the sliding frame 22 away from the rotating shaft 23; V-shaped groove 35, provided on the workbench 21; A sliding post 36 is fixed on the clamping member 24, and the end portion is slidably connected in the V-shaped groove 35; The guide member 37 is fixed on the sliding frame 22, and its end is slidably connected in a slide groove on the surface of the workbench 21, and the guide member 37 is connected to the inner wall of the slide groove through an elastic object.

[0027] In this embodiment, the driving member 31 is turned on, and the output end of the driving member 31 can drive the workbench 21 to rotate on the surface of the frame 1 through the driving shaft 32. When the workbench 21 rotates, it can drive the three groups of sliding frames 22 on its surface to rotate synchronously. The sliding frame 22 will drive the clamping member 24 on its surface to rotate through the rotating shaft 23. When the sliding frame 22 rotates to contact the surface of the convex member 34, the sliding frame 22 will slide on the surface of the workbench 21 toward the direction close to the tripod 25 under the action of the convex member 34. When sliding, the sliding frame 22 will drive the guide member 37 to compress the elastic material in the slide groove until the two groups of clamping members 24 push the workpiece to contact the side of the tripod 25.

[0028] When sliding, the two groups of clamping members 24 will respectively drive the sliding columns 36 on their sides to slide in the corresponding V-grooves 35. Therefore, in the process of the two groups of sliding columns 36 gradually sliding to the midpoint of the V-grooves 35, the two groups of sliding columns 36 will drive the two groups of clamping members 24 to move closer to each other on the surface of the rotating shaft 23 under the action of the V-grooves 35 until the two groups of clamping members 24 are in close contact with the surface of the workpiece. Therefore, the workpiece will be clamped and fixed under the joint action of the two groups of clamping members 24 and the tripod 25, which is convenient for the tapping unit 6 to perform tapping operations on the workpiece.

[0029] When the tapping unit 6 completes tapping the workpiece below it, the driving member 31 continues to drive the worktable 21 to rotate on the surface of the frame 1. When the end of the sliding frame 22 rotates to disengage from the convex member 34, the guide member 37 will drive the sliding frame 22 to slide on the surface of the worktable 21 away from the tripod 25 under the elastic force of the elastic material. At this time, the two groups of sliding columns 36 will slide in the V-groove 35 toward the two ends of the V-groove 35. Therefore, the two groups of sliding columns 36 will drive the two groups of clamping members 24 to open each other on the surface of the rotating shaft 23 under the action of the V-groove 35 until the two groups of clamping members 24 rotate to disengage from the surface of the workpiece, so that the tapped workpiece can be taken out from the two groups of clamping members 24, which is convenient for quick replacement of the workpiece.

[0030] In one embodiment of the present invention, Figure 3 and Figure 4 As shown, the rotating unit 4 includes: A support frame 41 is connected to the frame 1 and a driver 42 is mounted on the side; The rotating cylinder 43 is rotatably connected to the support frame 41, and the end portion is connected to the output end of the driver 42; The rotating rod 44 is slidably connected inside the rotating cylinder 43, and a tapping unit 6 is installed at the end away from the rotating cylinder 43. The surface of the rotating rod 44 and the inside of the rotating cylinder 43 are connected through a spline shaft and a spline sleeve.

[0031] In this embodiment, the driver 42 is turned on, and the output end of the driver 42 drives the rotating cylinder 43 to rotate. Since the rotating rod 44 and the rotating cylinder 43 are connected through the spline shaft and the spline sleeve, the rotating cylinder 43 drives the tapping unit 6 to rotate through the rotating rod 44, so that the tapping unit 6 can perform tapping operations on the workpiece. The driver 42 and the driving member 31 can both be electric motors or pneumatic motors, which are not limited here.

[0032] In one embodiment of the present invention, Figure 3 and Figure 4 As shown, the lifting unit 5 includes: The fixing frame 51 is connected to the side of the supporting frame 41 and has at least two groups of positioning grooves 59 on its surface; The slider 52 has one side slidably connected to the inside of the positioning groove 59, and the surface of the rotating cylinder 43 is rotatably connected to the inside of the slider 52; An elastic member 58 connected between the side surface of the slider 52 and the side surface of the support frame 41; The sliding member 53 is connected to the side of the slider 52 through the connecting rod 54. The surface of the rotating rod 44 is rotatably connected to the inside of the sliding member 53. A rotating wheel is installed on the surface of the rotating rod 44. The rotating wheel is rotatably connected to the inside of the sliding member 53. The arc groove 55 is formed on the surface of the rotating cylinder 43; The vertical groove 56 is formed on the surface of the rotating cylinder 43, and the two ends thereof are respectively connected to the two ends of the arc groove 55; The sliding shaft 57 is fixed on the sliding block 52 , and its ends are slidably connected inside the arc groove 55 and the vertical groove 56 .

[0033] In this embodiment, when the rotating cylinder 43 rotates clockwise, the arc groove 55 on its surface can be driven to rotate synchronously. Since the end of the sliding shaft 57 is slidably connected in the arc groove 55, the slider 52 will slide downward on the side of the fixed frame 51 under the action of the arc groove 55 and the sliding shaft 57. The positioning groove 59 can guide and limit the slider 52, thereby improving the stability of the slider 52 sliding on the side of the fixed frame 51.

[0034] The slider 52 can stretch the elastic member 58 when sliding downward. When the sliding shaft 57 slides to the lower end of the arc groove 55, the slider 52 slides to the lowest point. Since the lower end of the vertical groove 56 is connected to the lower end of the arc groove 55, the sliding shaft 57 will enter the lower end of the vertical groove 56. Therefore, the slider 52 will drive the sliding shaft 57 to slide in the vertical groove 56 in the opposite direction (upward) under the elastic force of the elastic member 58 until the sliding shaft 57 slides to the upper end of the vertical groove 56. At this time, the slider 52 slides to the highest point. Similarly, since the upper end of the vertical groove 56 is connected to the upper end of the arc groove 55, the slider 52 will slide downward again under the action of the arc groove 55 and the sliding shaft 57, and the cycle will be repeated in sequence, so that the slider 52 will slide back and forth up and down under the action of the arc groove 55, the vertical groove 56 and the sliding shaft 57.

[0035] When the slider 52 reciprocates up and down, it will drive the sliding member 53 at its end to reciprocate up and down synchronously through the connecting rod 54, so the sliding member 53 will drive the tapping unit 6 at its end to reciprocate up and down through the rotating rod 44, so that the tapping unit 6 can tap the workpiece in sequence. The elastic member 58 and the elastic object can be a spring or elastic rubber, which is not limited here.

[0036] In one embodiment of the present invention, Figure 4 As shown, the tapping unit 6 comprises: A first gear 61 is mounted on the surface of the rotating rod 44; The taps 62 are rotatably connected in the sliding member 53, and the taps 62 are installed in four groups; The second gear 63 is installed on the surface of the tap 62 and is meshed with the first gear 61 .

[0037] In this embodiment, when the rotating rod 44 rotates in the sliding member 53, it can drive the first gear 61 on its surface to rotate synchronously. Since the second gear 63 and the first gear 61 are meshed and connected, the four groups of second gears 63 will respectively drive the four groups of taps 62 to rotate in the sliding member 53 under the action of the first gear 61, so that the four groups of taps 62 can tap the workpiece at the same time.

[0038] Since a rotating wheel is installed on the surface of the rotating rod 44, and the rotating wheel is rotatably connected to the inside of the sliding member 53, when the slider 52 drives the sliding member 53 to slide up and down reciprocatingly through the connecting rod 54, the sliding member 53 will drive the rotating rod 44 to slide up and down synchronously through the rotating wheel. Therefore, when the sliding member 53 is lifted or lowered, the first gear 61 and the second gear 63 are always in a meshing state, so that the four groups of taps 62 can always keep rotating, which is convenient for the four groups of taps 62 to perform tapping operations on the workpiece.

[0039] The working principle of the present invention is: when tapping a workpiece, the workpiece is placed between the two groups of clamps 24, and the rotating unit 3 is turned on. The rotating unit 3 can drive the two groups of clamps 24 to rotate to the bottom of the tapping unit 6 through the workbench 21. At the same time, the sliding frame 22 will slide toward the direction close to the tripod 25 under the action of the rotating unit 3, so that the two groups of clamps 24 push the workpiece to contact the side of the tripod 25, and the two groups of clamps 24 are in close contact with the surface of the workpiece, so the workpiece will be clamped and fixed under the joint action of the two groups of clamps 24 and the tripod 25, which is convenient for the tapping unit 6 to tap the workpiece.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A four-axis tapping structure for a vertical machining center, characterized in that: The four-axis tapping structure of the vertical machining center includes: Rack (1); A clamping unit (2) is rotatably connected to the frame (1) and is used to clamp and fix the workpiece; A rotating unit (3) is rotatably connected to the surface of the frame (1) and is slidably connected to the end of the clamping unit (2), and is used to cooperate with the clamping unit (2) to achieve opening and closing of the clamping unit (2); A rotating unit (4) is rotatably connected to the frame (1), and a tapping unit (6) is installed at the end thereof, and is used to drive the tapping unit (6) to rotate, thereby achieving tapping of the workpiece; The lifting unit (5) is slidably connected to the surface of the rotating unit (4) and is used to cooperate with the rotating unit (4) to achieve the lifting and lowering of the tapping unit (6).

2. The four-axis tapping structure of the vertical machining center according to claim 1 is characterized in that: The clamping unit (2) comprises: A workbench (21) is rotatably connected to the frame (1), and the surface of the workbench (21) is slidably connected to three sets of sliding frames (22); A rotating shaft (23) is fixed on the three sets of sliding frames (22), and the surface of the rotating shaft (23) is rotatably connected with two sets of clamping members (24); The tripod (25) is fixed at the center position of the side of the workbench (21).

3. The four-axis tapping structure of the vertical machining center according to claim 2 is characterized in that: The rotating unit (3) comprises: A driving member (31) mounted on the frame (1); A driving shaft (32) is rotatably connected to the frame (1), one end of which is connected to the output end of the driving member (31) and the other end of which is connected to the center of the workbench (21); The circular ring (33) is fixed on the frame (1), and the inner wall thereof is respectively slidably connected to the end of the sliding frame (22) away from the rotating shaft (23) and the surface of the workbench (21); A convex member (34) is connected to the inner wall of the ring (33), and its surface is slidably connected to the end of the sliding frame (22) away from the rotating shaft (23); A V-shaped groove (35) is provided on the workbench (21); A sliding column (36) is fixed on the clamping member (24), and the end portion is slidably connected in the V-shaped groove (35); The guide member (37) is fixed on the sliding frame (22), and the end portion is slidably connected in a slide groove on the surface of the workbench (21), and the guide member (37) is connected to the inner wall of the slide groove through an elastic object.

4. The four-axis tapping structure of the vertical machining center according to claim 1 is characterized in that: The rotating unit (4) comprises: A support frame (41) is connected to the frame (1) and has a driver (42) mounted on the side thereof; A rotating cylinder (43) is rotatably connected to the support frame (41), and an end portion is connected to an output end of the driver (42); The rotating rod (44) is slidably connected inside the rotating cylinder (43), and a tapping unit (6) is installed at the end away from the rotating cylinder (43).

5. The four-axis tapping structure of the vertical machining center according to claim 4 is characterized in that: The lifting unit (5) comprises: A fixing frame (51) is connected to the side of the supporting frame (41) and has at least two groups of positioning grooves (59) on its surface; A slider (52) has one side slidably connected to the interior of the positioning groove (59), and the surface of the rotating cylinder (43) is rotatably connected to the interior of the slider (52); An elastic member (58) connected between a side surface of the slider (52) and a side surface of the support frame (41); A sliding member (53) is connected to the side of the slider (52) through a connecting rod (54), and the surface of the rotating rod (44) is rotatably connected to the inside of the sliding member (53); An arc groove (55) is formed on the surface of the rotating cylinder (43); A vertical groove (56) is formed on the surface of the rotating cylinder (43), and its two ends are respectively connected to the two ends of the arc groove (55); The sliding shaft (57) is fixed on the sliding block (52), and the end portion is slidably connected inside the arc groove (55) and the vertical groove (56).

6. The four-axis tapping structure of the vertical machining center according to claim 5 is characterized in that: The surface of the rotating rod (44) and the interior of the rotating cylinder (43) are connected via a spline shaft and a spline sleeve, and a rotating wheel is installed on the surface of the rotating rod (44), and the rotating wheel is rotatably connected to the interior of the sliding member (53).

7. The four-axis tapping structure of the vertical machining center according to claim 5, characterized in that: The tapping unit (6) comprises: A first gear (61) is mounted on the surface of the rotating rod (44); The taps (62) are rotatably connected in the sliding member (53), and the taps (62) are installed in four groups; The second gear (63) is mounted on the surface of the tap (62) and is meshedly connected with the first gear (61).

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