Drilling tool for three axial hole groups

Abstract

The present invention discloses a drilling tool for three axial hole groups, comprising a base and a guide rail subunit, an indexable clamping mechanism and a three-axis drill head group, wherein the indexable clamping mechanism and the three-axis drill head group are both arranged on the base and the guide rail subunit, and the three-axis drill head group is located above the indexable clamping mechanism. Advantages: The drilling tool for three axial hole groups adopts the three-axis drill head group and the indexable clamping mechanism in combination according to the distribution characteristics of the holes to be processed on the workpiece, thereby improving the drilling efficiency.

Description

Technical Field

[0001] The invention relates to a process equipment for mechanical processing, in particular to a drilling tool for a gas distribution part of a pneumatic rock drill, in particular to a drilling tool for three groups of axial holes on a valve cabinet, which is one of the main gas distribution parts of a pneumatic rock drill. Background Art

[0002] Rock drilling equipment is used to break soft ores, demolish solid or cement buildings, and mine clay, etc. Rock drilling equipment is mainly pneumatic rock drills. The valve cabinet involved in this design is one of the main gas distribution parts of the pneumatic rock drill. This part requires high precision and has many processing steps. There are three groups of 18 axial air holes around the wall of the valve cabinet, and each air hole is on the same circumference. The angles between the three groups of air holes are different (see attached Fig.12 , 13 ), but the number of holes in each group is the same (all 6 holes), and the angles between adjacent holes are equal (all 14 degrees). These axial air holes are made on a drilling machine, so it is necessary to design an efficient and practical drilling tool. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the prior art mentioned in the background technology lacks a drilling tool for processing three groups of 18 axial air holes around the wall of the valve cabinet and suitable for use with a drilling machine.

[0004] The technical solution adopted by the present invention is: a drilling tool for three axial hole groups, including a base and a guide rail sub-unit, an indexable clamping mechanism and a three-axis drill bit group, the indexable clamping mechanism and the three-axis drill bit group are both arranged on the base and the guide rail sub-unit, and the three-axis drill bit group is located above the indexable clamping mechanism;

[0005] The base and guide rail sub-unit comprises a base, a slide plate and two guide rails. The lower ends of the two guide rails are respectively vertically arranged on the base through guide rail fixing seats, and the slide plate is simultaneously slidably arranged on the two guide rails through two linear bearings.

[0006] The three-axis drill bit assembly includes a housing, a central rotating shaft at the center of the housing, three rotating shaft groups arranged on the housing and around the central rotating shaft, and three twist drills respectively connected to the three rotating shaft groups;

[0007] The shell is composed of an upper shell and a lower shell;

[0008] The central rotating shaft includes a central shaft and a central gear. The central shaft is rotatably inserted into the center position of the lower housing. The central gear is set on the central shaft through a key. The central shaft passes through the upper housing.

[0009] The three rotating shaft groups are arranged around the central shaft, and the three rotating shaft groups are all meshed with the central gear; the three rotating shaft groups each include a rotating shaft and a driven gear, the driven gear is arranged on the rotating shaft through a key, the driven gear meshes with the central gear, and the rotating shaft is rotatably connected to the upper shell and the lower shell through two bearings; the rotating shafts of the three rotating shaft groups are located on the same circumference; the angles between the rotating shafts in the three rotating shaft groups are respectively the angles between the three groups of axial holes to be processed;

[0010] The three twist drills are connected to the lower ends of the three rotating shafts through elastic chucks respectively;

[0011] The indexable clamping mechanism comprises a support, an elastic clamping and indexing mechanism, and a drilling template and a mandrel mechanism, wherein the support is arranged on the base, the elastic clamping and indexing mechanism is arranged on the support, and the drilling template and the mandrel mechanism are arranged on the elastic clamping and indexing mechanism;

[0012] The drilling template and mandrel mechanism comprises a drilling template and a mandrel, the mandrel is inserted into the drilling template and fixedly connected into one body by interference fit, and the lower end of the mandrel is inserted into the elastic clamping and indexing mechanism; the drilling template is provided with drilling template holes corresponding to the positions of the axial holes in the three groups of axial holes, and the lower end of the drilling template is convexly provided with a positioning boss for clamping the workpiece to be processed;

[0013] The elastic clamping and transfer mechanism comprises a cylinder, a clamping body, an elastic sleeve and an end cover. The clamping body is cylindrical, arranged vertically, and has a tapered hole inside with a large mouth facing upwards. The elastic sleeve is inserted into the tapered hole of the clamping body, and a core shaft is inserted into the inner hole of the elastic sleeve. The cylinder is fixed below the clamping body, and a piston rod of the cylinder is connected to the elastic sleeve; the end cover is arranged at the upper end of the clamping body, and a through hole for the core shaft to pass freely is provided on the end cover, and a through hole corresponding to the position of the axial holes in the three groups of axial holes is provided on the end cover, and the diameter of the through hole is larger than the diameter of the axial holes in the three groups of axial holes; a circle of annular grooves is provided on the outer wall of the clamping body, and at least two positioning grooves are provided at the groove bottom of the annular groove, and all the positioning grooves are located on the same circumference, and the angle formed between the hole centers of each two adjacent positioning grooves is equal, and the angle between the hole centers of each two adjacent positioning grooves is equal to twice the angle formed between the hole centers of two adjacent axial holes in the axial hole group to be processed;

[0014] The support includes a bracket, a guide ring, a first spring seat, a second spring seat and a locking screw. The bracket is cylindrical and vertically arranged. A circular ring bottom is provided at the lower end of the bracket, the circular ring bottom is fixed on the base, the guide ring is fixed on the upper part of the bracket, the lower part of the guide ring is inserted into the upper port of the bracket, the upper part of the guide ring is supported on the upper end face of the bracket, the outer diameter of the lower part of the guide ring matches the inner hole of the bracket, and the outer diameter of the upper part of the guide ring is equal to the outer diameter of the upper part of the bracket; the guide ring is formed by two semicircular guide ring units, and a plurality of ball grooves are arranged at intervals in a circle of inner ring mouths on the upper end face of the guide ring, and a ball is arranged in each ball groove through a ball bracket, the guide ring clamps the annular groove on the outer wall of the clamp, and the cylinder in the elastic clamping and transfer mechanism is located inside the bracket; the guide ring and the clamp The annular grooves on the concrete outer wall are connected by ball rolling; the first spring seat and the second spring seat are both arranged on the bracket, the first spring seat and the second spring seat are located on the same circumference, and the angle between the first spring seat and the second spring seat is equal to three times the angle formed between the hole centers of two adjacent axial holes in the axial hole group to be processed; two positioning through holes corresponding to the first spring seat and the second spring seat are opened at the lower part of the guide ring for positioning the clamp, and a compression spring and a positioning ball are arranged in each positioning through hole; the locking screw is inserted through the locking through hole on the bracket and extends into the locking screw hole on the lower part of the guide ring, and the locking screw is threadedly connected to the locking screw hole at the lower part of the guide ring for clamping the clamp.

[0015] The tooling of the present invention adopts a three-axis drill bit group and an indexable clamping mechanism for use in combination according to the distribution characteristics of the holes to be processed on the workpiece (valve cabinet), thereby improving the drilling efficiency.

[0016] Preferably, the central shaft and the lower shell are rotatably connected via a bearing, and the central shaft and the upper shell are rotatably connected via a bearing.

[0017] Preferably, a positioning pin is vertically arranged on the end cover, and a positioning slot cooperating with the positioning pin is protruded outwardly from the side of the drilling template.

[0018] In a preferred embodiment of the technical solution of the present invention, a convex ring is provided at a middle position of the outer wall of the clamp body, and an annular handle is fixedly connected to the convex ring.

[0019] Preferably, the upper shell and the lower shell are positioned by three connecting pins, and screws are arranged at the ends of the three connecting pins to lock the upper shell and the lower shell.

[0020] The beneficial effects of the present invention are:

[0021] The drilling tool of the three-group axial hole group adopts the three-axis drill head group and the indexable clamping mechanism to improve the drilling efficiency according to the distribution characteristics of the holes to be processed on the workpiece (valve cabinet). BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a general diagram of the drilling tooling for three groups of axial holes (the workpiece (valve cabinet) is shown in the figure).

[0023] Figure 2 It is a schematic diagram of the base and guide rail subunit.

[0024] Figure 3 It is the general picture of the three-axis drill group.

[0025] Figure 4 yes Figure 3 Schematic diagram of hiding the upper shell.

[0026] Figure 5 It is the general diagram of the indexable clamping mechanism.

[0027] Figure 6 It is a cross-sectional view of the drilling template and the mandrel mechanism.

[0028] Figure 7 It is a schematic diagram of the elastic clamping and transfer mechanism.

[0029] Figure 8 yes Figure 7 sectional view of .

[0030] Fig. 9 is a schematic diagram of the support.

[0031] Fig.10 It is an assembly diagram of the support and the elastic clamping and transfer mechanism.

[0032] Fig.11 yes Figure 5 Schematic diagram of the cross-section of the stent.

[0033] Fig.12 It is a schematic diagram of the valve cabinet.

[0034] Fig.13 This is the front view of the valve cabinet (reflecting the axial hole). DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0036] To make the content of the present invention more clearly understood, the following Figure 1-Figure 13 The specific implementation manner is further described.

[0037] 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 used to limit the present invention.

[0038] like Fig.12As shown, rock drilling equipment is used to break soft ores, demolish solid or cement buildings, mine clay, etc., and rock drilling equipment is mainly pneumatic rock drills. The valve cabinet to be processed involved in this embodiment is one of the main gas distribution parts of the pneumatic rock drill. The valve cabinet has high precision requirements and many processing steps. Among them, 40, valve cabinet, 41, first axial hole group, 42, second axial hole group, 43, third axial hole group, 44, incomplete pin hole, 45, inner hole.

[0039] like Fig.13 As shown, there are three groups of 18 axial air holes around the valve cabinet wall, each air hole is on the same circumference line, and the angles between the three groups of air holes are different (see attached Fig.13 ), but the number of holes in each group is the same (all 6 holes), and the angles between adjacent holes are equal (all 14 degrees). These axial air holes are made on a drilling machine, so it is necessary to design an efficient and practical drilling tool.

[0040] like Figure 1 As shown, in the present embodiment, a drilling tool with three axial hole groups includes a base and guide rail sub-unit 100, an indexable clamping mechanism 200 and a three-axis drill bit group 300. The indexable clamping mechanism 200 and the three-axis drill bit group 300 are both arranged on the base and guide rail sub-unit 100, and the three-axis drill bit group 300 is located above the indexable clamping mechanism 200.

[0041] like Figure 2 As shown, the base and guide rail sub-unit 100 includes a base 101, a slide 104 and two guide rails 103. The two guide rails 103 are arranged in parallel. The lower ends of the two guide rails 103 are vertically arranged on the base 101 through guide rail fixing seats 102 respectively, and the slide 104 is slidably arranged on the two guide rails 103 at the same time through two linear bearings 105.

[0042] like Figure 3 and 4 As shown, the three-axis drill bit group 300 includes a housing 330, a central shaft 310 at the center of the housing 330, three shaft groups 320 disposed on the housing 330 and arranged around the central shaft 310, and three twist drills 350 respectively connected to the three shaft groups 320.

[0043] The housing 330 is composed of an upper housing 331 and a lower housing 332. The upper housing 331 and the lower housing 332 are positioned by three connecting pins 333, and screws are provided at the ends of the three connecting pins 333 to lock the upper housing 331 and the lower housing 332. Figure 4 As shown, three connecting pins 333 are inserted into and fixed on the lower housing 332, as shown in FIG. Figure 3 As shown, holes for screw installation are provided at positions on the upper shell 331 corresponding to the three connecting pins 333 .

[0044] The central rotating shaft 310 includes a central shaft 311 and a central gear 313. The central shaft 311 is rotated and inserted into the center position of the lower shell 332. The central gear 313 is set on the central shaft 311 through a key. The central shaft 311 passes through the upper shell 331. The central shaft 311 and the lower shell 332 are rotatably connected by a bearing 312. The central shaft 311 and the upper shell 331 are rotatably connected by a bearing 312. The upper end of the central shaft 311 passes through the upper shell 331.

[0045] like Figure 3 As shown, when the tooling of this embodiment is in use, the central axis 311 of the three-axis drill bit group is aligned with the center of the main shaft of the drilling machine, and the central axis 311 of the three-axis drill bit group 300 is fixedly connected to the main shaft of the drilling machine.

[0046] like Figure 4 As shown, three rotating shaft groups 320 are arranged around the central shaft 311, and the three rotating shaft groups 320 are all meshed with the central gear 313; the three rotating shaft groups 320 each include a rotating shaft 321 and a driven gear 323, the driven gear 323 is arranged on the rotating shaft 321 through a key, the driven gear 323 meshes with the central gear 313, and the rotating shaft 321 is rotatably connected to the upper shell 331 and the lower shell 332 through two bearings 312; the rotating shafts 321 of the three rotating shaft groups 320 are located on the same circumference; the angles between the rotating shafts 321 in the three rotating shaft groups 320 are respectively the angles between the three groups of axial hole groups required to be processed; and the three twist drills 350 are respectively connected to the lower ends of the three rotating shafts 321 through elastic chucks 340.

[0047] In this embodiment, the elastic chuck 340 is a standard part matched with the twist drill 350 and can be directly purchased.

[0048] like Figure 5-11 As shown, the indexable clamping mechanism 200 includes a support 210, an elastic clamping and indexing mechanism 220, and a drilling template and mandrel mechanism 230. The support 210 is arranged on the base 101, the elastic clamping and indexing mechanism 220 is arranged on the support 210, and the drilling template and mandrel mechanism 230 is arranged on the elastic clamping and indexing mechanism 220.

[0049] like Figure 6 As shown, the drilling template and mandrel mechanism 230 includes a drilling template 231 and a mandrel 232. The mandrel 232 is inserted into the drilling template 231 and is fixedly connected to form a whole by interference fit. The lower end of the mandrel 232 is inserted into the elastic clamping and indexing mechanism 220. The drilling template 231 is provided with 18 drilling template holes, and the 18 drilling template holes correspond to the 18 axial air holes to be processed on the valve cabinet 40. The lower end of the drilling template 231 is convexly provided with a positioning boss for engaging the workpiece 40 (valve cabinet 40) to be processed.

[0050] like Figure 6As shown, in this embodiment, the positioning boss at the lower end of the drilling template 231 cooperates with the inner hole 45 on the valve cabinet 40. The drilling template 231 positions the workpiece 40 (valve cabinet 40) through the lower end surface and the positioning boss.

[0051] The drilling template 231 of this embodiment is roughly annular and made of bearing steel or high carbon steel.

[0052] like Figure 6 As shown, the mandrel 232 is fixedly connected to the central inner hole of the drilling template 231 by interference fit. The mandrel 232 passes through the central inner hole of the drilling template 231 and extends downward to be inserted into the inner hole of the elastic sleeve 224 in the elastic clamping and indexing mechanism. The outer diameter of the mandrel 232 matches the inner hole of the elastic sleeve 224.

[0053] like Figure 7 and 8 As shown, the elastic clamping and indexing mechanism 220 includes a cylinder 221 , a clamp body 223 , an elastic sleeve 224 and an end cover 225 .

[0054] like Figure 8 As shown, the clamp body 223 is cylindrical, vertically arranged, with a tapered hole inside, the large mouth facing upward, the elastic sleeve 224 is inserted into the tapered hole of the clamp body 223, the core shaft 232 is inserted into the inner hole of the elastic sleeve 224, the cylinder 221 is fixed below the clamp body 223, and the piston rod 222 of the cylinder 221 is connected to the elastic sleeve 224; the piston rod 222 drives the elastic sleeve 224 to move up and down along the axis of the tapered hole of the clamp body 223, thereby loosening or clamping the core shaft 232.

[0055] like Figure 8 As shown, the end cover 225 is arranged at the upper end of the clamp body 223, and a through hole is opened on the end cover 225 for the core shaft 232 to pass freely. 18 through holes are opened on the end cover 225, and the 18 through holes correspond to the 18 axial air holes to be processed on the valve cabinet 40 one by one, and the diameter of the through holes is larger than the diameter of the axial holes in the three groups of axial holes.

[0056] like Figure 8 As shown, a convex ring is provided at the middle position of the outer wall of the clamp body 223, and a ring handle 226 is fixedly connected to the convex ring.

[0057] like Figure 8 As shown, a circle of annular grooves is provided on the outer wall of the clamp body 223, and the annular groove is located between the lower part of the convex ring in the middle of the clamp body 223 and the upper part of the convex edge at the lower end of the clamp body 223. Five positioning grooves 227 are provided at the bottom of the annular groove. Figure 7As shown; all the positioning grooves 227 are located on the same circle, the angles formed between the centers of each two adjacent positioning grooves 227 are equal, and the angle between the centers of each two adjacent positioning grooves 227 is equal to 28°, which is twice the angle formed between the centers of two adjacent axial holes in the axial hole group to be processed.

[0058] like Fig.13 As shown, since the included angle between two adjacent axial air holes on the workpiece (valve cabinet 40) is relatively small, if the included angle between the positioning grooves on the clamp body is equal to the included angle between two adjacent axial air holes on the workpiece, the positioning grooves will be too close and incomplete. Therefore, the included angle between the positioning grooves on the clamp body is twice the included angle between two adjacent holes on the workpiece, and the compression spring 217 and the positioning ball 218 are used to alternately engage the positioning grooves 227 for positioning. Since the included angle between two adjacent axial air holes on the workpiece (valve cabinet 40) is 14°, the included angle between the hole centers of two adjacent positioning grooves 227 is 28°.

[0059] like Figure 7 As shown, a positioning pin 228 is vertically arranged on the end cover 225, and a positioning slot cooperating with the positioning pin 228 is protruded outwardly on the side of the drilling template 231. The positioning pin 228 matches the positioning slot on the drilling template 231 to determine the steering position of the drilling template 231 and the elastic clamping and indexing mechanism 220.

[0060] like Fig. 9 As shown, the support 210 includes a bracket 211 , a guide ring 212 , a first spring seat 214 , a second spring seat 215 and a locking screw 216 .

[0061] like Fig. 9 As shown, the bracket 211 is cylindrical and arranged upright. The lower end of the bracket 211 is provided with a circular ring bottom, which is fixed on the base 101. The guide ring 212 is fixed on the upper part of the bracket 211. The lower part of the guide ring 212 is inserted into the upper port of the bracket 211. The upper part of the guide ring 212 is supported on the upper end face of the bracket 211. The outer diameter of the lower part of the guide ring 212 matches the inner hole of the bracket 211, and the outer diameter of the upper part of the guide ring 212 is equal to the outer diameter of the upper part of the bracket 211.

[0062] like Fig. 9 As shown, the guide ring 212 is formed by two semicircular guide ring units, and a plurality of ball grooves are arranged at intervals in a circle of inner ring openings on the upper end surface of the guide ring 212. A ball 213 is arranged in each ball groove through a ball bracket. The guide ring 212 engages with the annular groove on the outer wall of the clamp body 223. The cylinder 221 in the elastic clamping and indexing mechanism 220 is located inside the bracket 211. The guide ring 212 and the annular groove on the outer wall of the clamp body 223 are connected by rolling through the ball 213. Fig.11As shown, the elastic clamping and transfer mechanism 220 is connected to the support 210 by a guide ring 212 formed by two semicircular guide rings in the support 210, which engages with the annular groove in the middle of the clamp body 223 and is rotatably connected to the support 210.

[0063] like Fig. 9 As shown, the first spring seat 214 and the second spring seat 215 are both arranged on the bracket 211, and the first spring seat 214 and the second spring seat 215 are located on the same circumference. The angle between the first spring seat 214 and the second spring seat 215 is equal to 42°, which is three times the angle formed between the centers of two adjacent axial holes in the axial hole group to be processed. Two positioning through holes corresponding to the first spring seat 214 and the second spring seat 215 are provided at the lower part of the guide ring 212 for positioning the clamp body 223, and a compression spring 217 and a positioning ball 218 are provided in each positioning through hole. The locking screw 216 is inserted through the locking through hole on the bracket 211 and extends into the locking screw hole on the lower part of the guide ring 212. The locking screw 216 is threadedly connected with the locking screw hole at the lower part of the guide ring 212 for pressing the clamp body 223.

[0064] like Fig.11 As shown, the plane where the two spring seats are located coincides with the plane where the five positioning grooves 227 are located on the clamp body 223. The two positioning balls 218 are alternately matched with one of the five positioning grooves 227 to position the clamp body 223 at a fixed angle. The locking screw arranged opposite the spring seat 216 is used to tighten the clamp body 223 after the fixed angle positioning.

[0065] The tooling of this embodiment uses a three-axis drill bit group and an indexable clamping mechanism in combination according to the distribution characteristics of the holes to be processed on the valve cabinet, thereby improving the drilling efficiency.

[0066] The working process of the tooling in this embodiment:

[0067] The indexable clamping mechanism 200 is fixed on the base 101 , and the three-axis drill head group 300 is fixed on the slide plate 104 , so that the center of the three-axis drill head group is aligned with the center of the indexable clamping mechanism 200 .

[0068] The drilling tool is placed on the drilling machine workbench so that the central axis 311 of the three-axis drill bit group is aligned with the center of the drilling machine spindle, and the central axis 311 of the three-axis drill bit group is fixedly connected to the drilling machine spindle.

[0069] The base 101 is fixed on the drilling machine, and the distance between the drill bit of the three-axis drill bit group and the drilling template is adjusted.

[0070] The lower chamber of the cylinder 221 is filled with air, the piston rod 222 moves upward, the elastic sleeve 224 is loosened, the drilling template and the mandrel mechanism 230 are taken out, and the processed workpiece is taken out.

[0071] As attached Figure 6 As shown, the valve cabinet 40 workpiece to be processed is installed. The drilling template and the mandrel mechanism 230 with the workpiece are reinserted into the elastic sleeve 224 of the elastic clamping and indexing mechanism 220, and the positioning groove on the drilling template 231 is clamped into the positioning pin 228 on the elastic clamping and indexing mechanism 220. The upper chamber of the cylinder 221 is filled with air, the piston rod 222 moves downward, the elastic sleeve 224 tightens the drilling template and the mandrel mechanism 230, and thereby presses the workpiece (valve cabinet 40).

[0072] The drilling machine is turned on, and the main shaft of the drilling machine drives the three-axis drill bit group 300 to move downward to drill holes. After the first batch of three holes are drilled, the locking screw 216 is loosened, and the annular handle 226 on the elastic clamping and indexing mechanism 220 is turned counterclockwise, so that the compression spring 217 and the positioning ball 218 of the second spring seat 215 are matched with the positioning groove 227 on the clamp body (the positioning ball 218 is inserted into the notch of the positioning groove 227); that is, the workpiece (valve cabinet 40) is rotated through an angle (14 degrees), and the locking screw 216 is tightened again, so that the main shaft of the drilling machine drives the three-axis drill bit group 300 to move downward. After drilling, loosen the locking screw 216 again, turn the annular handle 226 on the elastic clamping and indexing mechanism 220 counterclockwise, so that the compression spring 217 and the positioning ball 218 in the first spring seat 214 cooperate with the positioning groove 227 on the clamp body (the positioning ball 218 is inserted into the notch of the positioning groove 227), that is, the workpiece (valve cabinet 40) is rotated through an angle (14 degrees), and the locking screw 216 is tightened again, so that the main shaft of the drilling machine drives the three-axis drill bit group 300 to move down for drilling, ..., repeat the above actions until all 6 groups of 18 holes are processed.

[0073] The lower chamber of the cylinder 221 is filled with air, the piston rod 222 moves upward, the elastic sleeve 224 is loosened, the drilling template and the mandrel mechanism 230 are taken out, and the processed workpiece is taken out.

[0074] As attached Figure 6 As shown, the valve cabinet workpiece to be processed is reinstalled. The drilling template and the mandrel mechanism 230 with the workpiece are reinserted into the elastic sleeve 224 of the elastic clamping and transfer mechanism 220, and the positioning groove on the drilling template is clamped into the positioning pin 228 on the elastic clamping and transfer mechanism 220. The upper chamber of the cylinder 221 is filled with air, the piston rod 222 moves downward, and the elastic sleeve 224 tightens the drilling template and the mandrel mechanism 230, thereby pressing the workpiece (valve cabinet 40).

[0075] The drilling machine is turned on, and the main shaft of the drilling machine drives the three-axis drill bit group 300 to move downward to drill holes. After the first batch of three holes are drilled, the locking screw 216 is loosened, and the annular handle 226 on the elastic clamping and indexing mechanism 220 is turned clockwise to make the compression spring 217 and the positioning ball 218 in the first spring seat 214 cooperate with the positioning groove 227 on the clamp body (the positioning ball 218 is inserted into the notch of the positioning groove 227); that is, the workpiece is rotated through an angle (14 degrees), and the locking screw 216 is tightened again, so that the main shaft of the drilling machine drives the three-axis drill bit group 300 to move downward. After drilling, loosen the locking screw 216 again, turn the annular handle 226 on the elastic clamping and indexing mechanism 220 clockwise, so that the compression spring 217 and the positioning ball 218 in the first spring seat 215 cooperate with the positioning groove 227 on the clamp body (the positioning ball 218 is inserted into the notch of the positioning groove 227); that is, rotate the workpiece through an angle (14 degrees), re-tighten the locking screw 216, and make the drilling machine spindle drive the three-axis drill bit group 300 to move down for drilling, ..., repeat the above actions until all 6 groups of 18 holes are processed.

[0076] Repeat the above steps to process the workpiece (valve cabinet 40).

[0077] Anything not specifically described in the specification of the present invention is prior art or can be implemented by existing technology. It should be understood that for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A drilling tool for three axial hole groups, characterized in that: The invention comprises a base and a guide rail sub-unit (100), an indexable clamping mechanism (200) and a three-axis drill bit group (300), wherein the indexable clamping mechanism (200) and the three-axis drill bit group (300) are both arranged on the base and the guide rail sub-unit (100), and the three-axis drill bit group (300) is located above the indexable clamping mechanism (200); The base and guide rail sub-unit (100) comprises a base (101), a slide plate (104) and two guide rails (103); the lower ends of the two guide rails (103) are respectively vertically arranged on the base (101) through guide rail fixing seats (102); the slide plate (104) is simultaneously slidably arranged on the two guide rails (103) through two linear bearings (105); The three-axis drill bit assembly (300) comprises a housing (330), a central rotating shaft (310) located at the center of the housing (330), three rotating shaft assemblies (320) disposed on the housing (330) and arranged around the central rotating shaft (310), and three twist drills (350) respectively connected to the three rotating shaft assemblies (320); The housing (330) is composed of an upper housing (331) and a lower housing (332) joined together; The central rotating shaft (310) includes a central shaft (311) and a central gear (313). The central shaft (311) is rotated and inserted into the center position of the lower housing (332). The central gear (313) is set on the central shaft (311) through a key. The central shaft (311) passes through the upper housing (331). Three rotating shaft groups (320) are arranged around the central shaft (311), and the three rotating shaft groups (320) are all meshed with the central gear (313); the three rotating shaft groups (320) each include a rotating shaft (321) and a driven gear (323), the driven gear (323) is arranged on the rotating shaft (321) through a key, the driven gear (323) is meshed with the central gear (313), and the rotating shaft (321) is rotatably connected to the upper shell (331) and the lower shell (332) through two bearings (312); the rotating shafts (321) of the three rotating shaft groups (320) are located on the same circumference; the included angles between the rotating shafts (321) in the three rotating shaft groups (320) are respectively the included angles between the three groups of axial holes that need to be processed; The three twist drills (350) are respectively connected to the lower ends of the three rotating shafts (321) through elastic clamps (340); The indexable clamping mechanism (200) comprises a support (210), an elastic clamping and indexing mechanism (220) and a drilling template and mandrel mechanism (230); the support (210) is arranged on a base (101), the elastic clamping and indexing mechanism (220) is arranged on the support (210), and the drilling template and mandrel mechanism (230) is arranged on the elastic clamping and indexing mechanism (220); The drilling template and mandrel mechanism (230) comprises a drilling template (231) and a mandrel (232), wherein the mandrel (232) is inserted into the drilling template (231) and is fixedly connected to the drilling template by interference fit, and the lower end of the mandrel (232) is inserted into the elastic clamping and transfer mechanism (220); the drilling template (231) is provided with drilling template holes corresponding to the positions of the axial holes in the three groups of axial holes, and the lower end of the drilling template (231) is provided with a positioning boss for engaging the workpiece (40) to be processed; The elastic clamping and indexing mechanism (220) comprises a cylinder (221), a clamping body (223), an elastic sleeve (224) and an end cover (225). The clamping body (223) is cylindrical, vertically arranged, and has a tapered hole inside, with the large opening facing upward. The elastic sleeve (224) is inserted into the tapered hole of the clamping body (223). A core shaft (232) is inserted into the inner hole of the elastic sleeve (224). The cylinder (221) is fixed below the clamping body (223). The piston rod (222) of the cylinder (221) is connected to the elastic sleeve (224). The end cover (225) is arranged at the upper end of the clamping body (223). A hole is provided on the end cover (225) for the core shaft (232) to rotate freely. Through the through holes, through holes corresponding to the positions of the axial holes in the three axial hole groups are opened on the end cover (225), and the diameter of the through holes is larger than the diameter of the axial holes in the three axial hole groups; a circle of annular grooves is provided on the outer wall of the clamp body (223), and at least two positioning grooves (227) are provided at the bottom of the annular groove, and all the positioning grooves (227) are located on the same circumference, and the angle formed between the hole centers of each two adjacent positioning grooves (227) is equal, and the angle between the hole centers of each two adjacent positioning grooves (227) is equal to twice the angle formed between the hole centers of two adjacent axial holes in the axial hole group to be processed; The support (210) comprises a bracket (211), a guide ring (212), a first spring seat (214), a second spring seat (215) and a locking screw (216); the bracket (211) is cylindrical and vertically arranged; a circular ring bottom is arranged at the lower end of the bracket (211), and the circular ring bottom is fixed on the base (101); the guide ring (212) is fixed on the upper part of the bracket (211); the lower part of the guide ring (212) is inserted into the upper port of the bracket (211); the upper part of the guide ring (212) is supported on the upper end surface of the bracket (211); The outer diameter of the lower part of the ring (212) matches the inner hole of the bracket (211), and the outer diameter of the upper part of the guide ring (212) is equal to the outer diameter of the upper part of the bracket (211); the guide ring (212) is formed by two semicircular guide ring units, and a plurality of ball grooves are arranged at intervals in a circle of inner ring openings on the upper end surface of the guide ring (212), and a ball (213) is arranged in each ball groove through a ball bracket, and the guide ring (212) is engaged with the annular groove on the outer wall of the clamp body (223), and the cylinder (221) in the elastic clamping and transfer mechanism (220) is located at the bracket. The guide ring (212) is connected to the annular groove on the outer wall of the clamp body (223) by rolling connection via the ball bearing (213); the first spring seat (214) and the second spring seat (215) are both arranged on the bracket (211), the first spring seat (214) and the second spring seat (215) are located on the same circumference, and the angle between the first spring seat (214) and the second spring seat (215) is equal to three times the angle between the centers of two adjacent axial holes in the axial hole group to be processed; in the guide ring ( Two positioning through holes for positioning the clamp body (223) are provided at positions corresponding to the first spring seat (214) and the second spring seat (215) at the lower part of the guide ring (212), and a compression spring (217) and a positioning ball (218) are arranged in each positioning through hole; a locking screw (216) is inserted through the locking through hole on the bracket (211) and extends into the locking screw hole on the lower part of the guide ring (212); the locking screw (216) is threadedly connected to the locking screw hole at the lower part of the guide ring (212) for clamping the clamp body (223).

2. The drilling tool for three axial hole groups according to claim 1, characterized in that: The central shaft (311) and the lower shell (332) are rotatably connected via a bearing (312), and the central shaft (311) and the upper shell (331) are rotatably connected via a bearing (312).

3. The drilling tool for three axial hole groups according to claim 1, characterized in that: A positioning pin (228) is vertically arranged on the end cover (225), and a positioning slot cooperating with the positioning pin (228) is protruded outwardly from the side surface of the drilling template (231).

4. The drilling tool for three axial hole groups according to claim 1, characterized in that: A convex ring is provided at the middle position of the outer wall of the clamp body (223), and a ring handle (226) is fixedly connected to the convex ring.

5. The drilling tool for three axial hole groups according to claim 1, characterized in that: The upper shell (331) and the lower shell (332) are positioned by three connecting pins (333), and screws are arranged at the ends of the three connecting pins (333) to lock the upper shell (331) and the lower shell (332).

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