A drilling tool for processing large workpieces

Abstract

The present invention discloses a drilling tool for machining large workpieces, and relates to the technical field of machining tools, including a tool head, the top end of which is rotatably connected to a protective mechanism; the tool head includes a tool bar, the top end of which is rotatably connected to the inner wall of the protective mechanism, the protective mechanism includes a rotating sleeve, the rotation of which is connected to the outer wall of the tool bar, the top end of which is fixedly connected to a connector, and the inner wall of which is fixedly connected to a transmission rod. The present invention enables the protrusion to be pushed by the inclined groove when subjected to a large rotation resistance, so that the rotating seat moves upward, thereby compressing the pressure spring, so that the rotation force of the transmission rod cannot be transmitted to the tool bar, thereby preventing the side reaming tool and the main drilling tool from being forced to rotate when subjected to excessive resistance during hole opening, causing serious damage to the side reaming tool and the main drilling tool, thereby increasing the service life of the tool, reducing the use cost of the tool, and avoiding the tool from being stuck inside the workpiece when opening.

Description

Technical Field

[0001] The invention relates to the technical field of machining tools, in particular to a drilling tool for machining large workpieces. Background Art

[0002] CNC tools are a kind of tools used for cutting processing in mechanical manufacturing. With the continuous development of the CNC lathe industry today, the demand for the corresponding CNC tools is also increasing. During the CNC lathe processing, due to production and processing needs, it is often necessary to drill inner holes in mechanical parts, such as inner friction sleeve oil storage holes, bearing sleeve bead storage holes, etc. Corresponding drilling tools are often used to achieve efficient drilling operations on workpieces.

[0003] The CNC lathe tools in the prior art are not convenient for height adjustment, and the length of the tools themselves is fixed, which means that when drilling deeper holes, tools of different lengths need to be replaced, and therefore, tools of various specifications are required for drilling, which results in low applicability. The CNC lathe tools in the prior art are not convenient for quick and stable installation, and the tools and tool mounting seats are usually installed and fixed with bolts, but tools such as screwdrivers are avoided during disassembly and assembly, which makes disassembly and assembly cumbersome and inconvenient, and it is inconvenient to disassemble, maintain or replace the tools.

[0004] The existing patent (Announcement No.: CN219336008U) discloses a CNC lathe tool with high drilling efficiency, including a tool mounting seat, the bottom end of the tool mounting seat is movably connected to a connecting seat, the bottom of the connecting seat is movably connected to a tool handle, the bottom end of the tool handle is fixedly connected to a drilling cutter body, the adjustment structure includes an adjustment slot, the adjustment slot is opened at the upper end of the tool handle, the upper ends of both sides of the tool handle are provided with reserved slots, the inner wall of the reserved slot is movably connected with a fixing bolt extending to the inside of the adjustment slot, the bottom end of the connecting seat is fixedly connected to an adjustment rod, and both sides of the inside of the adjustment rod are provided with bolt holes. The CNC lathe tool with high drilling efficiency realizes the limited fixation of the adjustment rod after sliding by using the fixing bolt and the thread inside the bolt hole after the adjustment rod slides to a suitable distance, and then the adjustment length between the adjustment rod and the tool handle can be changed to meet the drilling operations of different depths and improve its applicability.

[0005] However, the above technical solution still has certain defects. When drilling a large workpiece, due to the large size of the workpiece and the large diameter of the hole to be drilled, in order to ensure the processing efficiency, the amount of cutting is generally large. This makes the pressure on the tool during the processing greater, resulting in a large friction between the tool and the workpiece, which makes the tool subject to a large rotational resistance. When the rotational resistance of the tool exceeds the limit that the tool can withstand, the tool will quickly wear out and become scrapped under the huge friction. For this reason, a drilling tool for large workpiece processing is proposed. Summary of the invention

[0006] Based on this, the purpose of the present invention is to provide a drilling tool for processing large workpieces to solve the technical problem raised in the above background that when the rotational resistance of the tool exceeds the limit that the tool can withstand, the tool will quickly wear out and become scrapped under the huge friction force.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: A drilling tool for machining large workpieces, comprising a tool head, the top end of which is rotatably connected to a protection mechanism;

[0008] The tool head comprises a knife rod, the top end of the knife rod is rotatably connected to the inner wall of the guard mechanism, the guard mechanism comprises a rotating sleeve, the rotating sleeve is rotatably connected to the outer wall of the knife rod, the top end of the rotating sleeve is fixedly connected with a connecting head, the inner wall of the rotating sleeve is fixedly connected with a transmission rod, the bottom end of the transmission rod is slidingly sleeved with a rotating seat, the outer wall of the transmission rod is opened and closed with two groups of inclined grooves, the inner wall of the rotating seat is fixedly connected with two groups of protrusions extending to the inside of the inclined groove, the inner wall of the rotating sleeve is rotatably connected with a collar, the collar is sleeved on the outside of the transmission rod, the bottom end of the collar is fixedly connected with a pressure spring, the bottom end of the pressure spring is fixedly connected to the top of the rotating seat, the pressure spring is sleeved on the outside of the transmission rod, the side wall of the rotating seat is provided with a plurality of groups of openings, the inner wall of each group of the openings is respectively slidably connected with a group of clamping blocks, and each group of the clamping blocks is fixedly connected to the top of the knife rod at the same time.

[0009] As a preferred technical solution of a drilling tool for large workpiece processing of the present invention, the outer wall of the tool rod is provided with multiple groups of liquid inlets, and the top of the rotating seat is provided with multiple groups of liquid ports extending through to the bottom of the rotating seat.

[0010] As a preferred technical solution of a drilling tool for large workpiece processing according to the present invention, the inner wall of the tool rod is slidably connected with a conical block, the side wall of the conical block is fixedly connected with multiple groups of sliding blocks extending to the outside of the tool rod, the outer wall of the tool rod is threadedly connected with a threaded ring, the threaded ring is slidably connected to the outer walls of the multiple groups of sliding blocks, and the bottom end of the tool rod is slidably connected with a fixed sleeve.

[0011] As a preferred technical solution for a drilling tool for processing large workpieces according to the present invention, the side wall of the tool rod is slidably connected to multiple groups of top blocks, one side of the multiple groups of top blocks abuts against the inner wall of the fixed sleeve, and the other side of the top blocks is attached to the outer wall of the conical block, and the side of the top block in contact with the conical block is arc-shaped and matches the curvature of the outer wall of the conical block.

[0012] As a preferred technical solution of a drilling tool for processing large workpieces of the present invention, the side wall of the fixed sleeve is slidably connected with multiple groups of side reaming cutters, the side wall of the side reaming cutter is provided with a fixing bolt extending into the interior of the fixed sleeve, and the bottom end of the fixed sleeve is fixedly connected with a main drilling cutter.

[0013] As a preferred technical solution for a drilling tool for processing large workpieces of the present invention, the interior of the conical block is hollow, the side wall of the conical block is provided with multiple groups of connecting holes, and the bottom end of the fixed sleeve is provided with multiple groups of spray holes penetrating into the interior of the tool rod.

[0014] As a preferred technical solution of a drilling tool for large workpiece processing of the present invention, the outer wall of the tool rod is rotatably connected to a connecting mechanism, and the connecting mechanism includes a sealing sleeve, which is rotatably connected to the outer wall of the tool rod, the side wall of the sealing sleeve is connected to a connecting pipe, and the end of the connecting pipe is connected to a fixed pipe.

[0015] As a preferred technical solution of a drilling tool for machining large workpieces of the present invention, a sealing ring is provided inside the fixing sleeve of the fixing tube, and a plurality of groups of protrusions are fixedly connected to the inner wall of the sealing ring.

[0016] As an optimal technical solution for a drilling tool for processing large workpieces of the present invention, the outer wall of the fixed tube is threadedly connected with a locking ring, one end of the locking ring located inside the fixed tube is fixedly connected with a tapered sleeve, the inner wall of the tapered sleeve is provided with a sealing ring, and the inner wall of the tapered sleeve abuts against the outer wall of the sealing ring.

[0017] In summary, the present invention mainly has the following beneficial effects:

[0018] 1. The present invention enables the protrusion to be pushed by the inclined groove when encountering a large rotation resistance, so that the rotating seat moves upward, thereby compressing the pressure spring, so that the rotation force of the transmission rod cannot be transmitted to the tool rod, thereby preventing the side reaming tool and the main drilling tool from being forcibly rotated when encountering excessive resistance during hole opening, thereby causing serious damage to the side reaming tool and the main drilling tool, thereby increasing the service life of the tool, reducing the use cost of the tool, and avoiding the tool being stuck inside the workpiece when opening the hole;

[0019] 2. The present invention rotates the threaded sleeve so that the threaded sleeve drives the conical block to push the top block downward, so that the fixing sleeve is tightly fixed to the outer wall of the tool rod. The threaded sleeve can be rotated in the opposite direction to loosen the fixing sleeve from the top block, so that different types of blades can be quickly replaced when they need to be replaced, thereby improving the replacement efficiency during the use of the tool. The side reaming cutter can be replaced separately by rotating the fixing bolt, so that the service life and use cost of the tool are further optimized, and the hollow design of the tool rod and the conical block is more conducive to heat dissipation during the drilling process;

[0020] 3. The present invention connects an external oil pump or water pump to a connecting mechanism through a pipeline, so that the oil pump or water pump pumps cutting fluid or lubricating oil into the connecting mechanism, so that the cutting fluid enters into the rotating sleeve through the liquid inlet, and then enters into the tool rod through the liquid outlet, so that the cutting fluid is sprayed out through the spray hole during the hole opening process, thereby cooling the tool during the cutting process, and quickly discharging iron chips generated during the cutting process from the workpiece, and through the rotating connection between the sealing sleeve and the rotating sleeve, the cutter head and the protective mechanism will not be affected by the connecting mechanism during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 It is a bottom view structural schematic diagram of the present invention;

[0023] Figure 3 It is a schematic diagram of the bottom structure of the fixing base of the present invention;

[0024] Figure 4 The internal structure of the fixing seat of the present invention;

[0025] Figure 5 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the cross-sectional structure of the rotating sleeve and the cutter bar of the present invention;

[0027] Figure 7 It is a schematic diagram of the cross-sectional structure of the fixed pipe of the present invention;

[0028] Figure 8 It is a schematic diagram of the cross-sectional structure of the rotating seat of the present invention.

[0029] In the figure: 1. cutter head; 2. protection mechanism; 3. connecting mechanism;

[0030] 101, tool bar; 102, tapered block; 103, slider; 104, threaded ring; 105, fixed sleeve; 106, top block; 107, side reamer; 108, fixing bolt; 109, main drilling tool; 110, connecting hole; 111, spray hole;

[0031] 201, rotating sleeve; 202, connector; 203, transmission rod; 204, rotating seat; 205, inclined groove; 206, convex block; 207, collar; 208, pressure spring; 209, opening; 210, clamping block; 211, liquid inlet; 212, liquid outlet;

[0032] 301, sealing sleeve; 302, connecting pipe; 303, fixing pipe; 304, sealing ring; 305, protrusion; 306, locking ring; 307, tapered sleeve; 308, sealing ring. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] The following describes an embodiment of the present invention based on its overall structure.

[0035] A drilling tool for machining large workpieces, such as Figures 1 to 8 As shown, it includes a cutter head 1, and the top end of the cutter head 1 is rotatably connected to a protection mechanism 2;

[0036] The cutter head 1 comprises a cutter bar 101, the top end of which is rotatably connected to the inner wall of the protection mechanism 2, the protection mechanism 2 comprises a rotating sleeve 201, the rotating sleeve 201 is rotatably connected to the outer wall of the cutter bar 101, the top end of the rotating sleeve 201 is fixedly connected to a connector 202, the inner wall of the rotating sleeve 201 is fixedly connected to a transmission rod 203, the bottom end sliding sleeve of the transmission rod 203 is provided with a rotating seat 204, the outer wall of the transmission rod 203 is opened and closed with two groups of inclined grooves 205, the inner wall of the rotating seat 204 is fixedly connected with two groups of protrusions 206 extending to the inside of the inclined grooves 205, the rotating sleeve 20 1 is rotatably connected with a collar 207, the collar 207 is sleeved on the outside of the transmission rod 203, the bottom end of the collar 207 is fixedly connected with a pressure spring 208, the bottom end of the pressure spring 208 is fixedly connected to the top of the rotating seat 204, the pressure spring 208 is sleeved on the outside of the transmission rod 203, the side wall of the rotating seat 204 is provided with a plurality of groups of openings 209, the inner wall of each group of the openings 209 is respectively slidably connected with a group of clamping blocks 210, each group of the clamping blocks 210 is fixedly connected to the top of the knife rod 101 at the same time, the outer wall of the knife rod 101 is provided with a plurality of groups of liquid inlets 211, the rotating seat The top of the rotary seat 204 is provided with a plurality of liquid ports 212 penetrating to the bottom of the rotary seat 204. The inner wall of the knife rod 101 is slidably connected with a conical block 102. The side wall of the conical block 102 is fixedly connected with a plurality of sliders 103 extending to the outside of the knife rod 101. The outer wall of the knife rod 101 is threadedly connected with a threaded ring 104. The threaded ring 104 is slidably connected to the outer walls of the plurality of sliders 103. The bottom end of the knife rod 101 is slidably connected with a fixed sleeve 105. The side wall of the knife rod 101 is slidably connected with a plurality of top blocks 106. One side of the plurality of top blocks 106 abuts against the inner wall of the fixed sleeve 105. The other side is fitted to the outer wall of the conical block 102, and the side of the top block 106 that contacts the conical block 102 is arc-shaped and matches the curvature of the outer wall of the conical block 102. The side wall of the fixed sleeve 105 is slidably connected with multiple groups of side reaming knives 107. The side wall of the side reaming knife 107 is provided with a fixing bolt 108 extending to the inside of the fixed sleeve 105. The bottom end of the fixed sleeve 105 is fixedly connected with a main drilling knife 109. The interior of the conical block 102 is hollow. The side wall of the conical block 102 is provided with multiple groups of connecting holes 110. The bottom end of the fixed sleeve 105 is provided with multiple groups of spray holes 111 that penetrate into the inside of the knife rod 101.

[0037] The side reamer 107 is fixed to the side wall of the fixing sleeve 105 by using the fixing bolt 108, and then the fixing sleeve 105 is pushed to connect the fixing sleeve 105 with the bottom end of the tool rod 101, and then the threaded ring 104 is rotated to make the threaded ring 104 move downward under the action of the thread, so that the threaded ring 104 drives the slider 103 to slide downward, so that the slider 103 slides downward on the conical block 102, and pushes the top block 106 during the downward movement of the conical block 102, so that the top block 106 slides to the outside of the tool rod 101, so that the top block 106 abuts against the inner wall of the fixing sleeve 105, at this time, the fixing sleeve 105 and the tool rod 101 cannot be separated, and the connecting head 202 is inserted into the fixed end of the tool on the machine tool, and the fixing sleeve 105 is connected to the fixed end of the tool on the machine tool. During the rotation of the movable connector 202, the connector 202 drives the rotating sleeve 201 to rotate, and the rotating sleeve 201 drives the transmission rod 203 to rotate during the rotation, so that the transmission rod 203 drives the inclined groove 205 to rotate. Since the inclined block is spirally arranged on the outer wall of the transmission rod 203, the inclined groove 205 applies a horizontal rotation force to the protrusion 206 during the rotation, and there is a force that pushes the protrusion 206 to move upward, but due to the elastic force of the pressure spring 208, the rotating seat 204 cannot move upward, thereby making the protrusion 206 unable to move upward. Therefore, at this time, the protrusion 206 can only rotate horizontally under the push of the inclined groove 205, and the protrusion 206 drives the rotating seat 204 to rotate during the horizontal rotation, and the rotating seat 204 passes through the opening 209 pushes the clamping block 210 to rotate, thereby rotating the tool rod 101. During the rotation of the tool rod 101, the fixed sleeve 105 is driven to rotate, thereby rotating the side reaming tool 107 and the main drilling tool 109, so that the tool can open the hole normally. However, when the tool encounters too much resistance during the drilling process, it is assumed that the side reaming tool 107 is stuck in the workpiece and cannot rotate. At this time, the fixed sleeve 105 cannot rotate, and the tool rod 101 and the clamping block 210 cannot rotate, thereby making the rotating seat 204 unable to rotate, so the protrusion 206 cannot rotate at this time. At this time, the connecting head 202 continues to rotate under the drive of the machine table, so that the rotating sleeve 201 continues to rotate, so that the transmission rod 203 drives the inclined slot 205 to continue to rotate. At this time, since the protrusion 206 cannot rotate, the inclined groove 205 pushes the protrusion 206 to move upward, thereby driving the rotating seat 204 to move upward and compressing the pressure spring 208, so that the rotating seat 204 drives the opening 209 to separate from the clamping block 210. At this time, the rotating seat 204 can continue to rotate. Therefore, the inclined block pushes the protrusion 206 to rotate, and the pressure spring 208 rebounds, so that the rotating seat 204 moves downward and resets while rotating, so that the opening 209 is slidably connected to the outer wall of the clamping block 210 again. If the entire cutter head 1 is still unable to rotate at this time, the inclined block will repeat the above process again, so that the rotational force of the transmission rod 203 cannot be fully transmitted to the cutter head 1, and is intermittently transmitted to the cutter head 1.The above process uses the case where the cutter head 1 is completely stuck and cannot rotate as an example. In actual use, the pressure spring 208 with corresponding elastic force can be used according to the use scenario, so that when the cutter head 1 is not completely stuck, the rotating seat 204 will be pushed to compress the pressure spring 208, so that the side reamer 107 and the main drilling cutter will not be forcibly driven to rotate by the machine when they are subject to large rotation resistance, thereby avoiding damage to the side reamer 107 and the main drilling cutter 109 due to operational errors during the processing process.

[0038] Please refer to Figure 2 and Figure 7 The outer wall of the knife rod 101 is rotatably connected with a connecting mechanism 3, and the connecting mechanism 3 includes a sealing sleeve 301, and the sealing sleeve 301 is rotatably connected with the outer wall of the knife rod 101. The side wall of the sealing sleeve 301 is connected with a connecting pipe 302, and the end of the connecting pipe 302 is connected with a fixed pipe 303. The fixed sleeve 105 inside the fixed pipe 303 is provided with a sealing ring 304, and the inner wall of the sealing ring 304 is fixedly connected with multiple groups of protrusions 305. The outer wall of the fixed pipe 303 is threadedly connected with a locking ring 306, and one end of the locking ring 306 located inside the fixed pipe 303 is fixedly connected with a conical sleeve 307, and the inner wall of the conical sleeve 307 is provided with a sealing ring 308, and the inner wall of the conical sleeve 307 abuts against the outer wall of the sealing ring 304.

[0039] The water outlet pipe of the oil pump or water pump is inserted into the fixed pipe 303, so that the sealing ring 308 and the sealing ring 304 are sleeved on the outside of the water outlet pipe, and the sealing ring 308 is fitted to the outer wall of the water outlet pipe by its own elastic force, thereby playing an auxiliary sealing effect, and then the locking ring 306 is rotated to make the locking ring 306 drive the tapered sleeve 307 to move, so that the tapered sleeve 307 pushes the sealing ring 304, so that the sealing ring 304 is tightly fitted to the outer wall of the water outlet pipe, and the protrusion 305 provided on the inside of the sealing ring 304, the contact area between the protrusion 305 and the outer wall of the water outlet pipe is smaller and the pressure is greater, so that the sealing effect is better, the cutting fluid or lubricating oil enters the fixed pipe 303 through the water outlet pipe, and then enters the sealing sleeve 301 through the connecting pipe 302, and the cutting fluid enters the rotating sleeve 201 through the liquid inlet 211, and then passes through the liquid The cutting fluid enters the tool bar 101 through the opening 212, and then a part of the cutting fluid is sprayed onto the fixed sleeve 105 from the connection between the slider 103 and the tool bar 101 to cool the fixed sleeve 105, and the other part is sprayed out through the connecting hole 110 on the conical block 102, and then sprayed out from the bottom of the fixed sleeve 105 through the spray hole 111, so that the iron filings generated during the drilling process are washed away. During the rotation of the protective mechanism 2 and the cutter head 1, since the sealing sleeve 301 is rotatably connected to the outer wall of the rotating sleeve 201, the connecting mechanism 3 will not affect the normal hole opening work of the entire tool. After separating the connector 202 from the machine, the locking ring 306 is rotated in the reverse direction so that the locking ring 306 drives the tapered sleeve 307 away from the sealing ring 304, so that the sealing ring 304 is no longer pushed by the tapered sleeve 307, and then the water outlet pipe can be pulled out from the fixed pipe 303.

[0040] When in use, by rotating the threaded sleeve, the threaded sleeve drives the conical block 102 to push the top block 106 downward, so that the fixed sleeve 105 is tightly fixed to the outer wall of the tool rod 101, and the threaded sleeve can be rotated in the opposite direction to make the top block 106 loosen the fixed sleeve 105, so that different types of blades can be quickly replaced when needed, thereby improving the replacement efficiency during the use of the tool, and the side reaming knife 107 can be replaced separately by rotating the fixing bolt 108, so that the service life and use cost of the tool are further optimized. The parts not involved in the device are the same as the prior art or can be implemented by the prior art.

[0041] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A drilling tool for machining large workpieces, comprising a tool head (1), characterized in that: The top end of the cutter head (1) is rotatably connected to a protection mechanism (2); The cutter head (1) comprises a cutter bar (101), the top end of the cutter bar (101) is rotatably connected to the inner wall of a protective mechanism (2), the protective mechanism (2) comprises a rotating sleeve (201), the rotating sleeve (201) is rotatably connected to the outer wall of the cutter bar (101), the top end of the rotating sleeve (201) is fixedly connected to a connector (202), the inner wall of the rotating sleeve (201) is fixedly connected to a transmission rod (203), the bottom end sliding sleeve of the transmission rod (203) is provided with a rotating seat (204), the outer wall of the transmission rod (203) is opened and closed with two groups of inclined grooves (205), the inner wall of the rotating seat (204) is fixedly connected with two groups of inclined grooves (205) extending into the inclined grooves (205), The protrusion (206) of the rotating sleeve (201) is rotatably connected to a collar (207) on the inner wall thereof, the collar (207) is sleeved on the outside of the transmission rod (203), the bottom end of the collar (207) is fixedly connected to a pressure spring (208), the bottom end of the pressure spring (208) is fixedly connected to the top of the rotating seat (204), the pressure spring (208) is sleeved on the outside of the transmission rod (203), the side wall of the rotating seat (204) is provided with a plurality of groups of openings (209), the inner wall of each group of the openings (209) is respectively slidably connected to a group of clamping blocks (210), and each group of the clamping blocks (210) is simultaneously fixedly connected to the top of the knife rod (101); The inner wall of the knife rod (101) is slidably connected to a conical block (102), the side wall of the conical block (102) is fixedly connected to multiple groups of sliders (103) extending to the outside of the knife rod (101), the outer wall of the knife rod (101) is threadedly connected to a threaded ring (104), the threaded ring (104) is slidably connected to the outer walls of the multiple groups of sliders (103), and the bottom end of the knife rod (101) is slidably connected to a fixed sleeve (105); The side wall of the knife rod (101) is slidably connected to a plurality of groups of top blocks (106), one side of the plurality of groups of top blocks (106) abuts against the inner wall of the fixing sleeve (105), and the other side of the top blocks (106) fits against the outer wall of the conical block (102), and the side of the top blocks (106) in contact with the conical block (102) is arc-shaped and matches the arc of the outer wall of the conical block (102); The side wall of the fixing sleeve (105) is slidably connected to a plurality of side reaming knives (107), the side wall of the side reaming knives (107) is provided with fixing bolts (108) extending into the interior of the fixing sleeve (105), and the bottom end of the fixing sleeve (105) is fixedly connected to a main drilling knife (109); The interior of the conical block (102) is hollow, a plurality of groups of connecting holes (110) are provided on the side wall of the conical block (102), and a plurality of groups of spray holes (111) penetrating into the interior of the knife rod (101) are provided at the bottom end of the fixing sleeve (105).

2. A drilling tool for machining large workpieces according to claim 1, characterized in that: The outer wall of the knife rod (101) is provided with a plurality of groups of liquid inlets (211), and the top end of the rotating seat (204) is provided with a plurality of groups of liquid outlets (212) extending through the bottom end of the rotating seat (204).

3. The large workpiece machining drilling tool according to claim 1, characterized in that: The outer wall of the knife rod (101) is rotatably connected to a connecting mechanism (3), the connecting mechanism (3) comprising a sealing sleeve (301), the sealing sleeve (301) is rotatably connected to the outer wall of the knife rod (101), the side wall of the sealing sleeve (301) is connected to a connecting pipe (302), and the end of the connecting pipe (302) is connected to a fixed pipe (303).

4. A drilling tool for machining large workpieces according to claim 3, characterized in that: The internal fixing sleeve (105) of the fixing tube (303) is provided with a sealing ring (304), and the inner wall of the sealing ring (304) is fixedly connected with multiple groups of protrusions (305).

5. A drilling tool for machining large workpieces according to claim 4, characterized in that: The outer wall of the fixed tube (303) is threadedly connected to a locking ring (306); one end of the locking ring (306) located inside the fixed tube (303) is fixedly connected to a conical sleeve (307); the inner wall of the conical sleeve (307) is provided with a sealing ring (308); the inner wall of the conical sleeve (307) abuts against the outer wall of the sealing ring (304).

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