Hollow drill structure

Abstract

The utility model relates to the technical field of hollow drills, and provides a hollow drill structure which comprises a drill bit and a drill rod, a fixing rod is arranged at the top of the drill bit, a fixing groove is formed in the side, close to the fixing rod, of the drill rod, the fixing rod is in sliding connection with the inner wall of the fixing groove, and a fixing mechanism is arranged on the side, close to the fixing rod, of the drill rod. The fixing mechanism comprises a locking section fixedly connected with the drill rod and a fixing barrel in threaded connection with the outer surface of the drill rod, an annular inclined face is arranged on the outer surface of the locking section, a locking inclined face used for extruding the annular inclined face is arranged in the fixing barrel, the drill bit is made of high-speed steel, the tooth depth of the drill bit is larger than 5 mm, and the tooth depth of the drill bit is larger than 5 mm. The tooth pitch on the drill bit is 6-7 mm, and the inclination angle is 3 degrees. Through the technical scheme, the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to hollow drill technical field, specifically, relate to a hollow drill structure. BACKGROUND

[0002] Hollow drill bit is the high -efficient drill of multiple cutting edges annular cutting, and the drilling diameter is from 12mm to 150mm, is mainly used to the drilling of steel member, such as steel structure engineering, rail transit, bridge, ship, machinery manufacturing, aerospace etc., and its drilling performance is obviously superior to traditional two-blade twist drill, with the characteristics of high drilling efficiency, drilling light and quick and labor-saving, and the multi-blade steel plate drill and magnetic seat drilling machine can be matched to carry out multidirectional drilling to large workpieces, convenient and flexible operation, effectively shorten the construction time, become the preferred tool of modern steel member drilling and annular groove processing.

[0003] In the mechanical processing workshop, hollow drill is often used for high-precision drilling operation on metal parts. Because the hardness of metal material is high, the drill bit is easy to wear in the continuous cutting process, and therefore needs to be replaced regularly. The traditional drill bit and drill rod are usually integrally formed, and when replacing, the drill rod and drill bit must be replaced together, which not only causes the waste of drill rod, but also leads to the increase of maintenance cost. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a hollow drill structure, which reduces the maintenance cost.

[0005] The technical scheme of the utility model is as follows: a hollow drill structure, comprising a drill bit and a drill rod, wherein the top of the drill bit is provided with a fixing rod, one side of the drill rod close to the fixing rod is provided with a fixing groove, the fixing rod and the inner wall of the fixing groove are in sliding connection, one side of the drill rod close to the fixing rod is provided with a fixing mechanism, the fixing mechanism comprises a locking segment fixedly connected with the drill rod and a fixing cylinder threadedly connected with the outer surface of the drill rod, the outer surface of the locking segment is provided with an annular inclined surface, and the inside of the fixing cylinder is provided with a locking inclined surface for extruding the annular inclined surface.

[0006] Further, a plurality of deformation seams are arranged on the annular inclined surface, and each deformation seam is arranged circumferentially with the center of the drill rod as the center.

[0007] Further, the top of the fixing rod is provided with a positioning block, the top of the fixing groove is provided with a positioning groove, the positioning block and the inner wall of the positioning groove are in sliding connection, the positioning block is fixedly connected with the fixing rod, and the outer surface of the drill rod is further provided with a reinforcing member for fixing the positioning block.

[0008] Further, the reinforcing piece comprises a fixing bolt, a fixing nut, the positioning block is provided with a fixing hole, the outer surface of the drill rod is provided with a threaded hole, the position of the threaded hole corresponds to the position of the fixing hole, the fixing bolt is in threaded connection with the inner wall of the threaded hole and the fixing hole, one end of the fixing bolt is in abutment with the outer surface of the drill rod, and the other end of the fixing bolt extends to the outside of the drill rod, and the fixing nut is in threaded connection with the side, away from the drill rod, of the fixing bolt and is in abutment with the outer surface of the drill rod.

[0009] Further, the positioning block and the positioning groove are both in square structure.

[0010] Further, the fixing rod is internally provided with an accommodating groove, the accommodating groove is internally provided with a positioning assembly, the positioning assembly comprises a positioning rod in rotational connection with the accommodating groove, an elastic piece and a positioning drill, the positioning drill is arranged at the central position of the drill bit, one end of the elastic piece is fixedly connected with the positioning rod, and the other end of the elastic piece is fixedly connected with the positioning drill.

[0011] Further, the bottom of the positioning rod is provided with a containing cylinder, and the top of the positioning drill is fixedly connected with a sliding rod, and the sliding rod is in sliding connection with the inside of the containing cylinder.

[0012] Further, the accommodating groove is internally provided with a rolling bearing, the positioning rod is fixedly connected with the inner ring of the rolling bearing, and the outer ring of the rolling bearing is fixedly connected with the inner wall of the accommodating groove.

[0013] The working principle and beneficial effects of the utility model are as follows:

[0014] The utility model discloses a fixing mechanism is arranged, when the drill bit is dismantled, the staff only needs to rotate the fixed cylinder, until the locking inclined surface on the fixed cylinder is separated from the annular inclined surface, makes the locking section restore deformation, at this moment, the operating personnel can dismantle the fixed rod from the fixed groove. The setting of the fixing mechanism makes the staff when replacing the drill bit, need not to replace the whole drill bit, only needs to dismantle the drill bit from the drill rod can, thereby, the maintenance cost of drill bit is reduced.

[0015] When installing, the fixed rod on the drill bit is aligned with the fixed groove and is pushed in, then the fixed cylinder is rotated, the locking inclined surface on the fixed cylinder will extrude the annular inclined surface, makes the locking section produce radial shrinkage, thereby firmly holds the fixed rod, realizes the stable connection of the drill bit and the drill rod. ACCURATE DRAWINGS

[0016] The utility model will be further explained in detail in connection with the drawings and specific embodiment.

[0017] Figure 1 It is structural schematic diagram for this embodiment one;

[0018] Figure 2A partial structure decomposition schematic view of the embodiment one;

[0019] Figure 3 A partial structure decomposition schematic view of the embodiment one;

[0020] Figure 4 A partial structure decomposition schematic view of the embodiment one;

[0021] Figure 5 A partial structure decomposition schematic view of the embodiment one;

[0022] Figure 6 A partial structure decomposition schematic view of the embodiment one; Figure 5 An enlarged schematic view of A in the embodiment one.

[0023] In the figure: 1, drill bit; 101, drill rod; 1011, fixed groove; 102, fixed rod; 103, locking section; 104, fixed cylinder; 105, annular inclined surface; 106, locking inclined surface; 107, deformation seam; 2, positioning block; 201, positioning groove; 202, fixed bolt; 203, fixed nut; 204, fixed hole; 205, threaded hole; 3, accommodating groove; 301, positioning rod; 302, elastic member; 303, positioning drill; 304, accommodating cylinder; 305, sliding rod; 306, rolling bearing. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor are involved in the protection scope of the present application.

[0025] Embodiment one:

[0026] Reference Figures 1-3The utility model provides a hollow drill structure, including drill bit 1, drill rod 101, the top of drill bit 1 is equipped with fixed rod 102, the side of drill rod 101 is equipped with fixed slot 1011 close to fixed rod 102, fixed rod 102 and fixed slot 1011 inner wall slip connection, drill rod 101 is equipped with fixed mechanism close to fixed rod 102, and fixed mechanism includes with the fixed connection of lock segment 103 of drill rod 101, the fixed cylinder 104 of screw connection with the outer surface of drill rod 101, lock segment 103 can be integrally formed with drill rod 101, and is made of spring steel (such as 65Mn spring steel). Spring steel has high elastic limit, yield strength and yield strength ratio, and has good fatigue strength. After deformation under external force extrusion, it can quickly recover original shape. In addition, spring steel also has excellent wear resistance, ensures that it is not easy to damage in the long-term use, so as to guarantee the normal work of drill bit 1. The outer surface of lock segment 103 is equipped with annular inclined plane 105, and the inside of fixed cylinder 104 is equipped with locking inclined plane 106 for extruding annular inclined plane 105.

[0027] By setting the fixed mechanism, when disassembling drill bit 1, the staff only needs to rotate the fixed cylinder 104 until the locking inclined plane 106 on the fixed cylinder 104 is separated from the annular inclined plane 105, so that the locking segment 103 restores deformation, at this time, the operator can disassemble the fixed rod 102 from the fixed slot 1011. The setting of the fixed mechanism makes the staff not need to replace the whole drill bit 1 when replacing the drill bit 1, only needs to disassemble the drill bit 1 from the drill rod 101, so as to reduce the maintenance cost of the drill bit 1.

[0028] When installing, the fixed rod 102 on the drill bit 1 is aligned with the fixed slot 1011 and pushed in, then the fixed cylinder 104 is rotated, since the fixed cylinder 104 is screw connected with the outer surface of the drill rod 101, so the fixed cylinder 104 will gradually move, at the same time, the locking inclined plane 106 on the fixed cylinder 104 will extrude the annular inclined plane 105, so that the locking segment 103 produces radial contraction, so as to firmly hold the fixed rod 102, realizing the stable connection of the drill bit 1 and the drill rod 101.

[0029] The fixed mechanism in the embodiment only needs the operator to rotate the fixed cylinder 104, so as to take down the drill bit 1 from the drill rod 101, without additional complex operation, so as to improve the efficiency of the staff replacing the drill bit 1. In addition, in order to facilitate the staff rotating the fixed cylinder 104, a rotating block with hexagonal cross section can be arranged on the outer surface of the fixed cylinder 104, so as to facilitate the staff rotating the fixed cylinder 104 with tools.

[0030] Further, a plurality of deformation joints 107 are arranged on the annular slope 105, and each deformation joint 107 is arranged circumferentially with the center of the drill rod 101 as the center. The arrangement of the deformation joint 107 makes the locking section 103 more easily deformed when being pressed by the locking slope 106 of the fixing cylinder 104. When the fixing cylinder 104 rotates to press the annular slope 105, the deformation joint 107 can make each part of the locking section 103 more flexible to shrink to the center, so as to more closely fit the fixing rod 102, and further improve the firmness of the connection between the drill bit 1 and the drill rod 101.

[0031] In the embodiment, the top of the fixing rod 102 is provided with a positioning block 2, the top of the fixing groove 1011 is provided with a positioning groove 201, the positioning block 2 is in sliding connection with the inner wall of the positioning groove 201, the positioning block 2 is fixedly connected with the fixing rod 102, and the outer surface of the drill rod 101 is further provided with a reinforcing member for fixing the positioning block 2. The positioning block 2 is in sliding connection with the inner wall of the positioning groove 201, and the cooperation of the two can ensure that the drill bit 1 is accurately positioned when being installed on the drill rod 101. The reinforcing member is used to fix the positioning block 2, further enhancing the stability of the connection between the drill bit 1 and the drill rod 101, preventing the drill bit 1 from rotating circumferentially or axially displacing during the drilling process, and improving the overall reliability of the hollow drill structure.

[0032] Secondly, the positioning block 2 and the positioning groove 201 are arranged in a square structure, and the square structure of the positioning block 2 and the positioning groove 201 can effectively prevent the relative rotation between the drill bit 1 and the drill rod 101. Because the square shape limits the freedom of the two in the circumferential direction, the drill bit 1 can rotate synchronously with the drill rod 101 during the working process, ensuring the stability and accuracy of the drilling.

[0033] Specifically, the reinforcing member includes a fixing bolt 202 and a fixing nut 203, the positioning block 2 is provided with a fixing hole 204, the outer surface of the drill rod 101 is provided with a threaded hole 205, the position of the threaded hole 205 corresponds to the position of the fixing hole 204, the fixing bolt 202 is in threaded connection with the inner walls of the threaded hole 205 and the fixing hole 204, one end of the fixing bolt 202 abuts against the outer surface of the drill rod 101, the other end of the fixing bolt 202 extends to the outside of the drill rod 101, the fixing nut 203 is in threaded connection with the side of the fixing bolt 202 away from the drill rod 101, and one side of the fixing nut 203 abuts against the outer surface of the drill rod 101.

[0034] When the positioning block 2 is pushed into the positioning groove 201 and the threaded hole 205 is in the same axis as the fixing hole 204, the worker can screw the fixing bolt 202 into the threaded hole 205, at the same time, the fixing bolt 202 is connected with the inner wall of the fixing hole 204, so that the other end of the fixing bolt 202 penetrates through one side of the drill rod 101 and extends to the outside, and the side of the fixing bolt 202 with the nut is in contact with the side surface of the drill rod 101. Next, the operator uses a tool to fix the fixing bolt 202, and then connects the fixing nut 203 with the fixing bolt 202, and makes one side of the fixing nut 203 in contact with the side surface of the drill rod 101. The fixing bolt 202 penetrates through the fixing hole 204 on the positioning block 2 and the threaded hole 205 on the drill rod 101, and is threadedly connected with the inner walls of the two, while being in contact with the outer surface of the drill rod 101 through the fixing nut 203. By using this double-threaded connection method, a larger fastening force can be provided to ensure that the positioning block 2 is firmly fixed on the drill rod 101, effectively preventing the drill bit 1 from loosening during operation. By tightening or loosening the fixing nut 203 and the fixing bolt 202, the worker can conveniently adjust the fixing state of the positioning block 2, and when it is necessary to replace the drill bit 1 or perform maintenance, the worker can also quickly disassemble the reinforcing part, thereby improving the convenience of operation. When disassembly is required, the fixing bolt 202 and the fixing nut 203 can be reversed.

[0035] In addition, marks can be made on the drill rod 101 and the drill bit 1, so that the operator can ensure that the thread direction inside the fixing hole 204 is consistent with the rotation direction of the threaded hole 205 when installing the drill bit 1, thereby facilitating the operator to smoothly screw the fixing bolt 202 into the threaded hole 205 and the fixing hole 204.

[0036] Embodiment Two:

[0037] On the basis of Embodiment One, with reference to Figures 4-6 In order to improve the accuracy of drilling, a receiving groove 3 is arranged inside the fixing rod 102 in this embodiment, and a positioning assembly is arranged inside the receiving groove 3. The positioning assembly comprises a positioning rod 301 rotatably connected with the receiving groove 3, an elastic member 302, and a positioning drill 303. The positioning drill 303 is arranged at the center position of the drill bit 1. One end of the elastic member 302 is fixedly connected with the positioning rod 301, and the other end of the elastic member 302 is fixedly connected with the positioning drill 303. The positioning drill 303 is arranged at the center position of the drill bit 1. When drilling starts, the positioning drill 303 can first contact the workpiece surface, providing initial positioning for the drilling of the drill bit 1, reducing deviation caused by errors, and improving the accuracy and perpendicularity of drilling.

[0038] When drilling, the drill rod 101 is fixed with an electric drill or other equipment (such as a machine tool), and then the positioning drill 303 is aligned with the center point of the workpiece surface. Next, the electric drill is started, and the electric drill drives the drill rod 101 and the drill bit 1 to rotate synchronously. Since the positioning rod 301 and the accommodating groove 3 are in relative rotation, and one side of the positioning drill 303 is in contact with the workpiece surface, the positioning drill 303 will not rotate under the action of the drill bit 1. Subsequently, the drill bit 1 moves downward under the drive of the electric drill, thereby realizing the drilling function. At the same time, since the positioning drill 303 does not rotate, it will move in the direction of the compression elastic member 302 under the action of the workpiece surface, thereby retracting into the drill bit 1. The positioning assembly in this embodiment is suitable for the case where the workpiece does not require deep drilling.

[0039] After drilling is completed, the operator disengages the drill bit 1 from the workpiece surface, and the elastic member 302 recovers the deformation to restore the positioning drill 303 to the extended position.

[0040] Secondly, the rolling bearing 306 is arranged in the accommodating groove 3, the positioning rod 301 is fixedly connected with the inner ring of the rolling bearing 306, the outer ring of the rolling bearing 306 is fixedly connected with the inner wall of the accommodating groove 3, and the arrangement of the rolling bearing 306 makes the relative rotation between the positioning rod 301 and the accommodating groove 3 more smooth, so that the positioning rod 301 will not rotate under the action of the drill bit 1, thereby reducing the friction between the positioning rod 301 and the accommodating groove 3. It is worth noting that the fixed connection between the positioning rod 301 and the rolling bearing 306 can adopt interference fit connection, expansion sleeve connection or set screw connection. Specifically, the interference fit refers to that the outer diameter of the positioning rod 301 is processed to be slightly larger than the inner diameter of the bearing inner ring. During installation, the bearing inner ring can be expanded by heating (hot installation method), or the positioning rod 301 can be shrunk by cooling (cold installation method), and then the positioning rod 301 is quickly installed into the bearing inner ring. After the temperature returns to normal, a large holding force is generated between the positioning rod 301 and the bearing inner ring due to the shrinkage or expansion of the material, thereby achieving tight connection. The expansion sleeve connection is a keyless connection device, which is usually composed of an inner ring, an outer ring and an expansion bolt. The expansion sleeve is arranged between the positioning rod 301 and the bearing inner ring, and the inner ring and the outer ring are deformed in the radial direction by tightening the expansion bolt, thereby tightly connecting the positioning rod 301 and the bearing inner ring. The set screw connection is to process a threaded hole 205 on the bearing inner ring, and the positioning rod 301 is fixed on the bearing inner ring through the set screw.

[0041] In addition, the positioning rod 301 is provided with a containing cylinder 304 at the bottom, and the positioning drill 303 is fixedly connected with a sliding rod 305 at the top, and the sliding rod 305 is slidably connected with the inside of the containing cylinder 304. The cooperation of the sliding rod 305 and the containing cylinder 304 enables the positioning drill 303 to freely slide in the containing cylinder 304, guarantees that the positioning drill 303 can flexibly stretch and retract under the action of the elastic member 302, prevents the positioning drill 303 from shaking or deviating during the working process, and further improves the positioning accuracy.

[0042] Example three:

[0043] The drill bit in the embodiment is made of high-speed steel, the tooth depth of the drill bit is greater than 5 mm, the tooth pitch on the drill bit is 6-7 mm, and the inclination angle is 3 degrees.

[0044] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hollow drill structure comprising a drill head (1), a drill rod (101), characterized in that, The top of the drill bit (1) is provided with a fixing rod (102), one side of the drill rod (101) close to the fixing rod (102) is provided with a fixing groove (1011), the fixing rod (102) and the inner wall of the fixing groove (1011) are in sliding connection, one side of the drill rod (101) close to the fixing rod (102) is provided with a fixing mechanism, the fixing mechanism comprises a locking section (103) fixedly connected with the drill rod (101), a fixing cylinder (104) threadedly connected with the outer surface of the drill rod (101), and the outer surface of the locking section (103) is provided with an annular inclined surface (105), and the inside of the fixing cylinder (104) is provided with a locking inclined surface (106) for extruding the annular inclined surface (105).

2. The hollow drill bit of claim 1, wherein: A plurality of deformation seams (107) are arranged on the annular inclined surface (105) and arranged in a circumferential direction with the center of the drill rod (101) as the center.

3. The hollow drill bit of claim 1, wherein: The top of the fixing rod (102) is provided with a positioning block (2), the top of the fixing groove (1011) is provided with a positioning groove (201), the positioning block (2) and the inner wall of the positioning groove (201) are in sliding connection, the positioning block (2) is fixedly connected with the fixing rod (102), and the outer surface of the drill rod (101) is further provided with a reinforcing part for fixing the positioning block (2).

4. The hollow drill bit of claim 3, wherein: The reinforcing part comprises a fixing bolt (202) and a fixing nut (203), the positioning block (2) is provided with a fixing hole (204), the outer surface of the drill rod (101) is provided with a threaded hole (205), the position of the threaded hole (205) corresponds to the position of the fixing hole (204), the fixing bolt (202) is in threaded connection with the inner walls of the threaded hole (205) and the fixing hole (204), one end of the fixing bolt (202) abuts against the outer surface of the drill rod (101), the other end of the fixing bolt (202) extends to the outside of the drill rod (101), and the fixing nut (203) is in threaded connection with the side of the fixing bolt (202) away from the drill rod (101), and one side of the fixing nut (203) abuts against the outer surface of the drill rod (101).

5. The hollow drill structure according to claim 3, wherein: The positioning block (2) and the positioning groove (201) are both in square structure.

6. The hollow drill bit of claim 1, wherein: The inside of the fixing rod (102) is provided with an accommodating groove (3), the inside of the accommodating groove (3) is provided with a positioning assembly, the positioning assembly comprises a positioning rod (301) rotationally connected with the accommodating groove (3), an elastic member (302) and a positioning drill (303), the positioning drill (303) is arranged at the center position of the drill bit (1), one end of the elastic member (302) is fixedly connected with the positioning rod (301), and the other end of the elastic member (302) is fixedly connected with the positioning drill (303).

7. The hollow drill structure according to claim 6, wherein: The bottom of the positioning rod (301) is provided with a containing cylinder (304), the top of the positioning drill (303) is fixedly connected with a sliding rod (305), and the sliding rod (305) is in sliding connection with the inside of the containing cylinder (304).

8. The hollow drill structure according to claim 6, wherein: The accommodating groove (3) is internally provided with a rolling bearing (306), the positioning rod (301) is fixedly connected with an inner ring of the rolling bearing (306), and an outer ring of the rolling bearing (306) is fixedly connected with an inner wall of the accommodating groove (3).

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