A vertical machining center four-axis tapping structure

Abstract

The application discloses a vertical machining center four-axis tapping structure and belongs to the technical field of tapping structures. The vertical machining center four-axis tapping structure comprises a rack, a clamping unit rotatably connected to the rack, a rotating unit rotatably connected to the surface of the rack and slidably connected to the end of the clamping unit, a rotating unit rotatably connected to the rack and provided with a tapping unit at the end, and a lifting unit slidably connected to the surface of the rotating unit. The rotating unit can drive the tapping unit to rotate, and the lifting unit can drive the tapping unit to reciprocatingly slide up and down under the cooperation of the rotating unit. The clamping unit can be periodically clamped and opened under the cooperation of the rotating unit. When the clamping unit clamps and fixes workpieces, the tapping unit can tap the workpieces. When the tapping unit finishes tapping the workpieces, the clamping unit can be automatically opened, and the tapping unit can tap the workpieces in the next group of clamping units. The vertical machining center four-axis tapping structure has the advantage of high tapping efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tapping structure, in particular to a vertical machining center four-axis tapping structure. BACKGROUND

[0002] A vertical machining center four-axis tapping structure is disclosed in Chinese patent (publication number: CN117754301B), which comprises a base, a vertical column fixedly connected to the side of the base, and a spindle box slidingly connected to the surface of the vertical column. During the process of tapping and drilling of the workpiece by the four-axis vertical machining center, the iron filings on the surface of the workpiece and in the drilled hole are cleaned by the cleaning port and the blowing port. The cleaning port sucks the iron filings on the surface of the workpiece, which is beneficial to cleaning the iron filings on the surface of the workpiece. Then, the blowing port moves to the surface of the workpiece, and the wind blown by the fan is blown out through the blowing pipe and the blowing port. When the blowing port moves to the position of the drilled hole on the surface of the workpiece, the wind blown by the blowing port blows out the iron filings in the hole, which is beneficial to automatically cleaning the iron filings on the surface of the workpiece and in the hole during the process of replacing the machining tool for drilling the hole on the surface of the workpiece, thereby reducing the influence of the iron filings on the subsequent tapping of the hole.

[0003] The vertical machining center four-axis tapping structure in the above technical solution still 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 vertical machining center four-axis tapping structure to solve the above problems. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the present application is to provide a vertical machining center four-axis tapping structure to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A vertical machining center four-axis tapping structure comprises:

[0007] a rack;

[0008] a clamping unit rotatably connected to the rack for clamping and fixing the workpiece;

[0009] a rotating unit rotatably connected to the surface of the rack and slidingly connected to the end of the clamping unit for cooperating with the clamping unit to achieve the opening and closing of the clamping unit;

[0010] a rotating unit rotatably connected to the rack, and a tapping unit installed at the end of the rotating unit for driving the tapping unit to rotate, thereby realizing the tapping of the workpiece;

[0011] 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 of the tapping unit.

[0012] As a preferred technical scheme of the present application, the clamping unit comprises: a workbench rotatably connected to the frame, the surface of the workbench being slidably connected to three groups of sliding frames; a rotating shaft fixed to the three groups of sliding frames, the surface of the rotating shaft being rotatably connected to two groups of clamping pieces; and a tripod fixed to the center of the side surface of the workbench.

[0013] As a preferred technical scheme of the present application, the rotating unit comprises: a driving piece installed on the frame; a driving shaft rotatably connected to the frame, one end of the driving shaft being connected to the output end of the driving piece and the other end being connected to the center of the workbench; a circular ring fixed to the frame, the inner wall of the circular ring being slidably connected to the end of the sliding frame away from the rotating shaft and the surface of the workbench; a convex piece connected to the inner wall of the circular ring, the surface of the convex piece being slidably connected to the end of the sliding frame away from the rotating shaft; a V-shaped groove formed in the workbench; a sliding column fixed to the clamping piece, the end of the sliding column being slidably connected to the V-shaped groove; and a guide piece fixed to the sliding frame, the end of the guide piece being slidably connected to the sliding groove in the surface of the workbench, and the guide piece being connected to the inner wall of the sliding groove through an elastic member.

[0014] As a preferred technical scheme of the present application, the rotating unit comprises: a support frame connected to the frame, the side surface of the support frame being provided with a driver; a rotating cylinder rotatably connected to the support frame, the end of the rotating cylinder being connected to the output end of the driver; and a rotating rod slidably connected to the inside of the rotating cylinder, the end of the rotating rod away from the rotating cylinder being provided with the tapping unit.

[0015] As a preferred technical scheme of the present application, the lifting unit comprises: a fixing frame connected to the side surface of the support frame, the surface of the fixing frame being provided with at least two groups of positioning grooves; a sliding block slidably connected to the inside of the positioning groove on one side, the surface of the rotating cylinder being rotatably connected to the inside of the sliding block; an elastic member connected between the side surface of the sliding block and the side surface of the support frame; a sliding piece connected to the side surface of the sliding block through a connecting rod, the surface of the rotating rod being rotatably connected to the inside of the sliding piece; an arc-shaped groove formed in the surface of the rotating cylinder; a vertical groove formed in the surface of the rotating cylinder, the two ends of the vertical groove being respectively communicated with the two ends of the arc-shaped groove; and a sliding shaft fixed to the sliding block, the end of the sliding shaft being slidably connected to the inside of the arc-shaped groove and the vertical groove.

[0016] As a preferred technical scheme of the present application, the surface of the rotating rod and the inside of the rotating cylinder are connected through a spline shaft and a spline sleeve, and the surface of the rotating rod is provided with a rotating wheel, the rotating wheel being rotatably connected to the inside of the sliding piece.

[0017] As a preferred technical scheme of the present application, the tapping unit comprises: a first gear installed on the surface of the rotating rod; a tap rotatably connected to the inside of the sliding piece, the tap being provided with four groups; and a second gear installed on the surface of the tap, the second gear being meshingly connected with the first gear.

[0018] Compared with the prior art, the embodiment of the present application has the following beneficial effects: when tapping a workpiece, the workpiece is placed in the clamping unit, the rotating unit is turned on, the rotating unit can drive the tapping unit to rotate, and the lifting unit can drive the tapping unit to reciprocatingly slide up and down under the cooperation of the rotating unit, so that the tapping unit can tap the workpiece.

[0019] Compared with the prior art, the embodiment of the present application has the following beneficial effects: when tapping a workpiece, the workpiece is placed in the clamping unit, the rotating unit is turned on, the rotating unit can drive the tapping unit to rotate, and the lifting unit can drive the tapping unit to reciprocatingly slide up and down under the cooperation of the rotating unit, so that the tapping unit can tap the workpiece.

[0020] To more clearly illustrate the structural features and effects of the present application, the present application will be described in detail below with reference to the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The overall structure schematic diagram of the vertical machining center four-axis tapping structure provided by the embodiment of the present application.

[0022] Figure 2 The structure schematic diagram of the rotating unit provided by the embodiment of the present application.

[0023] Figure 3 The local enlarged view of part A in the embodiment of the present application. Figure 1

[0024] Figure 4 The structure schematic diagram of the lifting unit provided by the embodiment of the present application.

[0025] The drawings show that: 1, rack; 2, clamping unit; 21, workbench; 22, sliding frame; 23, rotating shaft; 24, clamping piece; 25, triangular frame; 3, rotating unit; 31, driving piece; 32, driving shaft; 33, circular ring; 34, convex piece; 35, V-shaped groove; 36, sliding column; 37, guide piece; 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 piece; 54, connecting rod; 55, arc-shaped groove; 56, vertical groove; 57, sliding shaft; 58, elastic piece; 59, positioning groove; 6, tapping unit; 61, first gear; 62, tap; 63, second gear. DETAILED DESCRIPTION ​

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0027] The specific implementation of the present application is described in detail below in combination with specific examples.

[0028] Referring to Figures 1-4 A vertical machining center four-axis tapping structure comprises:

[0029] A rack 1;

[0030] A clamping unit 2 is rotationally connected to the rack 1 and is used for clamping and fixing a workpiece;

[0031] A rotating unit 3 is rotationally connected to the surface of the rack 1 and is slidingly connected to the end of the clamping unit 2 and is used for cooperating with the clamping unit 2 to realize the opening and closing of the clamping unit 2;

[0032] A rotating unit 4 is rotationally connected to the rack 1 and has a tapping unit 6 installed at the end thereof and is used for driving the tapping unit 6 to rotate so as to realize the tapping of the workpiece;

[0033] A lifting unit 5 is slidingly connected to the surface of the rotating unit 4 and is used for cooperating with the rotating unit 4 to realize the lifting of the tapping unit 6.

[0034] In an embodiment of the present application, when tapping the workpiece, the workpiece is placed in the clamping unit 2, 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 reciprocatingly slide up and down under the cooperation of the rotating unit 4. The rotating unit 3 is turned on, the clamping unit 2 can be periodically clamped and opened under the cooperation of 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 finishes tapping the workpiece, the clamping unit 2 can be automatically opened, and the tapping unit 6 can tap the workpiece in the next group of clamping units 2, so as to facilitate the rapid replacement of the workpiece and have the advantage of high tapping efficiency.

[0035] In an embodiment of the present application, as shown in Figure 1 and Figure 2 The clamping unit 2 comprises:

[0036] A workbench 21 is rotationally connected to the rack 1, and the surface of the workbench 21 is slidingly connected with three groups of sliding frames 22;

[0037] The rotating shaft 23 is fixed on the three groups of sliding frames 22, and the surface of the rotating shaft 23 is rotationally connected with the two groups of clamping pieces 24.

[0038] The tripod 25 is fixed at the center of the side surface of the workbench 21.

[0039] In the embodiment, when tapping the workpiece, first, the workpiece is placed between the two groups of clamping pieces 24, the rotating unit 3 is turned on, the rotating unit 3 can drive the two groups of clamping pieces 24 to rotate to the lower side of the tapping unit 6 through the workbench 21, and at the same time, the sliding frame 22 slides to the direction close to the tripod 25 under the action of the rotating unit 3, the sliding frame 22 can drive the two groups of clamping pieces 24 to synchronously slide through the rotating shaft 23 when sliding, so that the two groups of clamping pieces 24 push the workpiece to contact the side surface of the tripod 25, and the two groups of clamping pieces 24 rotate 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 clamping pieces 24 and the surface of the workpiece are in close contact, so that the workpiece is clamped and fixed under the joint action of the two groups of clamping pieces 24 and the tripod 25, and the tapping unit 6 can tap the workpiece.

[0040] In an embodiment of the present application, as shown in Figure 1 and Figure 2 The rotating unit 3 comprises:

[0041] The driving piece 31 is installed on the rack 1;

[0042] The driving shaft 32 is rotationally connected on the rack 1, one end is connected on the output end of the driving piece 31, and the other end is connected on the center of the workbench 21;

[0043] The circular ring 33 is fixed on the rack 1, the inner wall is respectively and slidingly connected with the end of the sliding frame 22 away from the rotating shaft 23 and the surface of the workbench 21;

[0044] The convex piece 34 is connected on the inner wall of the circular ring 33, and the surface is slidingly connected with the end of the sliding frame 22 away from the rotating shaft 23;

[0045] The V-shaped groove 35 is opened on the workbench 21;

[0046] The sliding column 36 is fixed on the clamping piece 24, and the end is slidingly connected in the V-shaped groove 35;

[0047] The guide piece 37 is fixed on the sliding frame 22, and the end is slidingly connected in the sliding groove on the surface of the workbench 21, and the guide piece 37 is connected with the inner wall of the sliding groove through the elastic body.

[0048] In the 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 rack 1, the workbench 21 can drive the three groups of sliding frames 22 on the surface to rotate synchronously when rotating, the sliding frame 22 can drive the clamping members 24 on the 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 can slide on the surface of the workbench 21 to the direction of approaching the tripod 25 under the action of the convex member 34, the sliding frame 22 can drive the guide member 37 to compress the elastic member in the sliding groove when sliding, until the two groups of clamping members 24 push the workpiece to contact the side surface of the tripod 25.

[0049] The two groups of clamping members 24 can drive the sliding columns 36 on the side surface to slide in the corresponding V-shaped grooves 35 when sliding, so that the two groups of sliding columns 36 gradually slide to the midpoint of the V-shaped grooves 35, the two groups of clamping members 24 can be driven to approach each other on the surface of the rotating shaft 23 under the action of the V-shaped grooves 35, until the two groups of clamping members 24 and the surface of the workpiece are in close contact, so that the workpiece can be clamped and fixed under the joint action of the two groups of clamping members 24 and the tripod 25, facilitating the tapping unit 6 to tap the workpiece.

[0050] When the tapping unit 6 taps the workpiece below, the driving member 31 continues to drive the workbench 21 to rotate on the surface of the rack 1, when the end of the sliding frame 22 rotates to separate from the convex member 34, the guide member 37 can drive the sliding frame 22 to slide on the surface of the workbench 21 to the direction of moving away from the tripod 25 under the elastic force of the elastic member, at this time, the two groups of sliding columns 36 can slide in the V-shaped grooves 35 to the direction of approaching the two ends of the V-shaped grooves 35, so that the two groups of clamping members 24 can be driven to open away from each other on the surface of the rotating shaft 23 under the action of the V-shaped grooves 35, until the two groups of clamping members 24 rotate to separate from the surface of the workpiece, so that the tapped workpiece can be taken out from the two groups of clamping members 24, facilitating the quick replacement of the workpiece.

[0051] In one embodiment of the application, as shown in Figure 3 and Figure 4 the rotating unit 4 comprises:

[0052] the support frame 41 is connected to the rack 1, and the driving device 42 is installed on the side surface;

[0053] the rotating cylinder 43 is rotatably connected to the support frame 41, and the output end of the driving device 42 is connected to the end of the rotating cylinder 43;

[0054] the rotating rod 44 is slidably connected in the rotating cylinder 43, and the tapping unit 6 is installed on the end away from the rotating cylinder 43, and the surface of the rotating rod 44 and the inside of the rotating cylinder 43 are connected through the spline shaft and the spline sleeve.

[0055] In the 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 tap the workpiece. The driver 42 and the driving member 31 can be a motor or a pneumatic motor, which is not limited herein.

[0056] In one embodiment of the application, as shown in Figure 3 and Figure 4 The lifting unit 5 comprises:

[0057] The fixed frame 51 is connected to the side of the support frame 41, and at least two groups of positioning grooves 59 are formed in the surface of the fixed frame 51.

[0058] The sliding block 52 is slidably connected to the inside of the positioning groove 59 on one side, and the rotating cylinder 43 is rotatably connected to the inside of the sliding block 52.

[0059] The elastic member 58 is connected between the side of the sliding block 52 and the side of the support frame 41.

[0060] The sliding member 53 is connected to the side of the sliding block 52 through the connecting rod 54, and the rotating rod 44 is rotatably connected to the inside of the sliding member 53. The rotating rod 44 is provided with a rotating wheel, and the rotating wheel is rotatably connected to the inside of the sliding member 53.

[0061] The arc-shaped groove 55 is formed in the surface of the rotating cylinder 43.

[0062] The vertical groove 56 is formed in the surface of the rotating cylinder 43, and the two ends of the vertical groove 56 are in communication with the two ends of the arc-shaped groove 55, respectively.

[0063] The sliding shaft 57 is fixed on the sliding block 52, and the end of the sliding shaft 57 is slidably connected to the inside of the arc-shaped groove 55 and the vertical groove 56.

[0064] In the embodiment, when the rotating cylinder 43 rotates clockwise, the arc-shaped groove 55 on the surface of the rotating cylinder 43 can be driven to rotate synchronously. Since the end of the sliding shaft 57 is slidably connected to the arc-shaped groove 55, the sliding block 52 can slide downward on the side of the fixed frame 51 under the action of the arc-shaped groove 55 and the sliding shaft 57. The positioning groove 59 can guide and limit the sliding block 52, thereby improving the stability of the sliding block 52 sliding on the side of the fixed frame 51.

[0065] When the sliding block 52 slides downward, the elastic member 58 is stretched, and when the sliding shaft 57 slides to the lower end of the arc-shaped groove 55, the sliding block 52 slides to the lowest point. Since the lower end of the vertical groove 56 is communicated with the lower end of the arc-shaped groove 55, the sliding shaft 57 enters the lower end of the vertical groove 56, and the sliding block 52 reversely (upward) slides in the vertical groove 56 under the elastic pulling of the elastic member 58, until the sliding shaft 57 slides to the upper end of the vertical groove 56, and the sliding block 52 slides to the highest point. Since the upper end of the vertical groove 56 is communicated with the upper end of the arc-shaped groove 55, the sliding block 52 again slides downward under the action of the arc-shaped groove 55 and the sliding shaft 57, and the process is repeated, so that the sliding block 52 reciprocatingly slides upward and downward under the action of the arc-shaped groove 55, the vertical groove 56 and the sliding shaft 57.

[0066] When the sliding block 52 reciprocatingly slides upward and downward, the sliding member 53 at the end of the connecting rod 54 is driven to reciprocatingly slide upward and downward synchronously, so that the tapping unit 6 at the end of the sliding member 53 is driven to reciprocatingly slide upward and downward by the rotating rod 44, and the tapping unit 6 can sequentially and orderly tap the workpiece. The elastic member 58 and the elastic object can be a spring or elastic rubber, which is not limited herein.

[0067] In an embodiment of the present application, as shown in Figure 4 The tapping unit 6 comprises:

[0068] The first gear 61 is installed on the surface of the rotating rod 44.

[0069] The tap 62 is rotationally connected in the sliding member 53, and four groups of taps 62 are installed on the tap 62.

[0070] The second gear 63 is installed on the surface of the tap 62 and is in meshing connection with the first gear 61.

[0071] In the embodiment, when the rotating rod 44 rotates in the sliding member 53, the first gear 61 on the surface of the rotating rod 44 is driven to synchronously rotate, and since the second gear 63 is in meshing connection with the first gear 61, the four groups of second gears 63 are respectively driven to rotate in the sliding member 53 by the first gear 61, so that the four groups of taps 62 can simultaneously tap the workpiece.

[0072] Since the surface of the rotating rod 44 is installed with a rotating wheel, and the rotating wheel is rotationally connected in the sliding member 53, when the sliding block 52 drives the sliding member 53 to reciprocatingly slide upward and downward through the connecting rod 54, the sliding member 53 drives the rotating rod 44 to synchronously reciprocatingly slide upward and downward through the rotating wheel, so that the first gear 61 and the second gear 63 are always in meshing connection during the lifting and lowering of the sliding member 53, so that the four groups of taps 62 can always rotate, and the four groups of taps 62 can conveniently tap the workpiece.

[0073] The working principle of the present application is that when tapping the workpiece, the workpiece is placed between the two sets of clamping pieces 24, the rotating unit 3 is turned on, the rotating unit 3 can drive the two sets of clamping pieces 24 to rotate to the lower side of the tapping unit 6 through the workbench 21, and at the same time the sliding frame 22 will slide to the direction of the triangular frame 25 under the action of the rotating unit 3, so that the two sets of clamping pieces 24 push the workpiece to contact the side surface of the triangular frame 25, and the two sets of clamping pieces 24 and the surface of the workpiece are in close contact, so the workpiece will be clamped and fixed under the joint action of the two sets of clamping pieces 24 and the triangular frame 25, and the tapping unit 6 can tap the workpiece.

[0074] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through intermediate medium, can be the communication between two elements or the interaction between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vertical machining center four-axis tapping structure, characterized in that, The vertical machining center four-axis tapping structure comprises: a rack (1); a clamping unit (2) rotatably connected to the rack (1) and used for clamping and fixing a workpiece, the clamping unit (2) comprising: a workbench (21) rotatably connected to the rack (1), the surface of the workbench (21) being slidably connected to three groups of sliding frames (22); a rotating shaft (23) fixed to the three groups of sliding frames (22), the surface of the rotating shaft (23) being rotatably connected to two groups of clamping pieces (24); and a tripod (25) fixed to the center of the side surface of the workbench (21); a rotating unit (3) rotatably connected to the surface of the rack (1) and slidably connected to the end of the clamping unit (2), used for cooperating with the clamping unit (2) to realize the opening and closing of the clamping unit (2), the rotating unit (3) comprising: a driving piece (31) mounted on the rack (1); a driving shaft (32) rotatably connected to the rack (1), one end of the driving shaft (32) being connected to the output end of the driving piece (31) and the other end of the driving shaft (32) being connected to the center of the workbench (21); a circular ring (33) fixed to the rack (1), the inner wall of the circular ring (33) being 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 piece (34) connected to the inner wall of the circular ring (33), the surface of the convex piece (34) being slidably connected to the end of the sliding frame (22) away from the rotating shaft (23); a V-shaped groove (35) formed in the workbench (21); a sliding column (36) fixed to the clamping piece (24), the end of the sliding column (36) being slidably connected to the V-shaped groove (35); and a guide piece (37) fixed to the sliding frame (22), the end of the guide piece (37) being slidably connected to the sliding groove in the surface of the workbench (21), the guide piece (37) being connected to the inner wall of the sliding groove through an elastic member; when the sliding frame (22) rotates to contact the surface of the convex piece (34), the sliding frame (22) will slide on the surface of the workbench (21) towards the tripod (25) under the action of the convex piece (34), and the two groups of sliding columns (36) will drive the two groups of clamping pieces (24) to move towards each other on the surface of the rotating shaft (23) under the action of the V-shaped groove (35), until the two groups of clamping pieces (24) are in close contact with the surface of the workpiece; a rotating unit (4) rotatably connected to the rack (1), the end of the rotating unit (4) being provided with a tapping unit (6), used for driving the tapping unit (6) to rotate, thereby realizing the tapping of the workpiece; a lifting unit (5) slidably connected to the surface of the rotating unit (4), used for cooperating with the rotating unit (4) to realize the lifting of the tapping unit (6).

2. The vertical machining center four-axis tapping structure according to claim 1, characterized in that, The rotating unit (4) comprises: a support frame (41) connected to the rack (1), the side surface of the support frame (41) being provided with a driver (42); a rotating cylinder (43) rotatably connected to the support frame (41), the end of the rotating cylinder (43) being connected to the output end of the driver (42); a rotating rod (44) slidably connected to the inside of the rotating cylinder (43), the end of the rotating rod (44) away from the rotating cylinder (43) being provided with the tapping unit (6).

3. The vertical machining center four-axis tapping structure according to claim 2, characterized in that, The lifting unit (5) comprises: a fixed frame (51) connected to the side surface of the support frame (41), the surface of the fixed frame (51) being provided with at least two groups of positioning grooves (59). The slider (52) is slidably connected to the inside of the positioning groove (59) on one side, and the rotating cylinder (43) is surface-rotatably connected to the inside of the slider (52); The elastic member (58) is connected between the side of the slider (52) and the side of the support frame (41); The sliding member (53) is connected to the side of the slider (52) through the connecting rod (54), and the rotating rod (44) is surface-rotatably connected to the inside of the sliding member (53); The arc-shaped groove (55) is arranged on the surface of the rotating cylinder (43); The vertical groove (56) is arranged on the surface of the rotating cylinder (43), and the two ends thereof are respectively communicated with the two ends of the arc-shaped groove (55); The sliding shaft (57) is fixed to the slider (52) and slidably connected to the inside of the arc-shaped groove (55) and the vertical groove (56).

4. The vertical machining center four-axis tapping structure according to claim 3, characterized in that, The surface of the rotating rod (44) and the inside of the rotating cylinder (43) are connected through the spline shaft and the spline sleeve, and the surface of the rotating rod (44) is provided with a rotating wheel which is rotatably connected to the inside of the sliding member (53).

5. The vertical machining center four-axis tapping structure according to claim 4, characterized in that, The tapping unit (6) comprises: The first gear (61) is arranged on the surface of the rotating rod (44); The tap (62) is rotatably connected to the inside of the sliding member (53), and the tap (62) is provided with four groups; The second gear (63) is arranged on the surface of the tap (62) and is in meshing connection with the first gear (61).

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