Non-hammer bottom drill

Abstract

The present invention relates to the technical field of hole enlarging equipment, and proposes a non-hammer bottom enlarging drill, including a drill shank and a drill bit, and also a bottom enlarging assembly, wherein the drill bit is arranged on the drill shank by means of the bottom enlarging assembly; the bottom enlarging assembly includes: a tool holder top block, which has two oppositely arranged inclined surfaces, and the drill bit is arranged at the end of the tool holder top block; a tool holder cover, which is arranged at the other end of the tool holder top block, and the tool holder cover is provided with a through hole, and the inclined surface faces the through hole; two bottom enlarging knives, which are symmetrically arranged, and the bottom enlarging knives are located on the inclined surfaces and can be unfolded to enlarge the hole; and an adjustment assembly, which is arranged between the drill shank and the bottom enlarging knife and is used to control the bottom enlarging knife to extend or retract. Through the above technical scheme, the problem of large expansion resistance of the anchor bolt head caused by the diameter of the bottom end of the hole being less than or equal to the diameter of the entrance in the related art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hole enlarging equipment, and in particular to a non-hammer bottom enlarging drill. Background Art

[0002] Post-anchoring technology has been widely used in high-load installation and fixation of roads, railways, bridges, steel structures, and heavy machinery and equipment. The installation process is as follows: first, a straight hole is drilled on the concrete substrate, and then a special bottom expansion drill is used to expand the bottom of the straight hole. The cavity of the expanded hole is consistent with the geometric shape of the anchor head after expansion. After the post-expansion anchor head expands, it closely cooperates with the concrete cavity to form a mechanical locking mechanism. Since the head of the anchor needs to expand, but the diameter of the hole after drilling is the same or larger at the top and smaller at the bottom, in order to ensure that the anchor can expand smoothly after entering the hole and play a fixing role, a hole expansion device is needed to expand the bottom of the hole so that the bottom diameter of the hole is larger than the diameter of the entrance. Summary of the invention

[0003] The present invention provides a non-hammer bottom expansion drill, which solves the problem in the related art that the expansion resistance of the anchor bolt head is large due to the diameter of the bottom end of the hole being less than or equal to the diameter of the entrance.

[0004] The technical solution of the present invention is as follows: a non-hammer bottom enlargement drill, comprising a drill shank and a drill bit, and also comprising a bottom enlargement assembly, wherein the drill bit is arranged on the drill shank by means of the bottom enlargement assembly; the bottom enlargement assembly comprises:

[0005] The tool holder top block has two inclined surfaces arranged opposite to each other, and the drill bit is arranged at the end of the tool holder top block;

[0006] A tool holder cover is arranged at the other end of the tool holder top block, the tool holder cover is provided with a through hole, and the inclined surface faces the through hole;

[0007] Two bottom expansion knives are symmetrically arranged, and the bottom expansion knives are located on the inclined surface and can be unfolded to expand the diameter of the hole; and

[0008] The adjustment component is arranged between the drill handle and the bottom expanding knife and is used for controlling the bottom expanding knife to extend or retract.

[0009] As a further technical solution, the adjustment component includes:

[0010] A movable pull rod is inserted into the through hole;

[0011] A bottom pipe is hinged to the two bottom expansion knives, and the bottom pipe is rotatably connected to the end of the movable pull rod;

[0012] A sleeve, one end of which has an external thread and the other end of which has an internal thread, the tool holder cover has an external thread, the sleeve is sleeved on the tool holder cover and is threadedly connected to the tool holder cover;

[0013] The positioning member has a threaded hole, the sleeve is inserted into the threaded hole and is threadedly connected to the positioning member; the positioning member has a limiting rod, the limiting rod has an external thread, the positioning member has a through hole, and the movable pull rod passes through the through hole;

[0014] A plug having a threaded hole, the limiting rod is inserted into the threaded hole, and the plug is threadedly connected to the positioning member;

[0015] A slider having a through hole, the drill handle being slidably arranged on the slider, and the outer surface of the slider having a keyway;

[0016] A sliding chamber is arranged outside the sliding block and has a groove, the groove matches the keyway, the sliding chamber is provided with a first synchronization hole, and the sliding chamber is fixedly connected to the drill handle 1;

[0017] A synchronization key is located in the keyway and the groove at the same time, the synchronization key and the cock are both provided with second synchronization holes, the first synchronization holes and the second synchronization holes are the same in number and are coaxially arranged;

[0018] When the plug slides on the limiting rod, the plug drives the drill shank to move axially with the help of the sliding chamber, and the drill shank pushes the movable pull rod to move, and the movable pull rod pushes the two bottom expansion knives apart.

[0019] As a further technical solution, the positioning member further comprises:

[0020] A bearing seat having an internal thread;

[0021] A bearing is disposed in the bearing seat, wherein the inner ring of the bearing contacts the sleeve;

[0022] The bearing cover has an external thread and is threadedly connected to the bearing seat, and the bearing is arranged between the bearing seat and the bearing cover; the limit rod is arranged on the bearing seat and passes through the bearing cover, the movable pull rod passes through the limit rod axially, and the limit rod is connected to the sleeve.

[0023] As a further technical solution, the positioning member further comprises a pressure plate, which is arranged between the bearing and the bearing cover, and the bearing cover presses the pressure plate onto the inner ring of the bearing.

[0024] As a further technical solution, the positioning member further comprises a retaining spring, which is arranged between the pressure plate and the bearing cover, and the retaining spring is clamped in the bearing seat for axial positioning of the bearing and the pressure plate.

[0025] As a further technical solution, the slider, the keyway and the groove are all two and are arranged one to one.

[0026] As a further technical solution, the outside of the tap has anti-slip grooves.

[0027] As a further technical solution, one end of the sliding chamber has a large opening and the other end has a small opening, and the end with the small opening is fixedly connected to the drill handle.

[0028] The working principle and beneficial effects of the present invention are as follows: compared with the prior art, a bottom expanding assembly is arranged between the drill shank and the drill bit, and the drill shank transmits power to the drill bit with the help of the bottom expanding assembly. The bottom expanding assembly includes a tool holder top block, a tool holder cover, a bottom expanding knife and an adjustment assembly. The tool holder top block is connected to the tool holder cover, and the drill bit is arranged at the end of the tool holder top block. The tool holder top block has an inclined surface, and the tool holder cover has a through hole, which is connected to the inclined surface. There are two bottom expanding knives and two inclined surfaces. The bottom expanding knives correspond to the inclined surfaces one by one, and the bottom expanding knife is located on the inclined surface. The adjustment assembly is connected to the bottom expanding knife and is used to push the bottom expanding knife out of the inclined surface or pull it back to the inclined surface.

[0029] The non-hammer bottom expansion drill provided by the present invention has the following beneficial effects:

[0030] 1. You can drill a hole first, and then expand the diameter of the bottom of the hole;

[0031] 2. With the help of positioning parts, holes of different depths can be drilled, and the bottom expansion operation of holes of various depths can be performed more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Figure 1 A schematic diagram of the structure of a non-hammer bottom expansion drill provided by the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of the exploded structure at an angle;

[0035] Figure 3 for Figure 1 A schematic diagram of the explosion mechanism at another angle;

[0036] In the figure:

[0037] 1. Drill shank, 2. Drill bit, 3. Tool holder top block, 4. Tool holder cover, 5. Bottom expansion knife, 6. Movable pull rod, 7. Casing, 8. Plug, 9. Slider, 10. Sliding chamber, 11. Synchronous key, 12. Bearing seat, 13. Bearing, 14. Bearing cover, 15. Pressure plate, 16. Retaining ring, 17. Bottom tube, 18. Limit rod. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1~Figure 3 As shown, this embodiment provides a non-hammer bottom enlargement drill, including a drill shank 1 and a drill bit 2, and also includes a bottom enlargement assembly, the drill bit 2 is arranged on the drill shank 1 by means of the bottom enlargement assembly; the bottom enlargement assembly includes:

[0040] The tool holder top block 3 has two oppositely arranged inclined surfaces, and the drill bit 2 is arranged at the end of the tool holder top block 3;

[0041] The tool holder cover 4 is arranged at the other end of the tool holder top block 3, and the tool holder cover 4 is provided with a through hole, with the inclined surface facing the through hole;

[0042] Two bottom expansion knives 5 are symmetrically arranged, and the bottom expansion knives 5 are located on the inclined surface and can be unfolded to expand the diameter of the hole; and

[0043] The adjustment component is arranged between the drill handle 1 and the bottom expansion knife 5 and is used to control the bottom expansion knife 5 to extend or retract.

[0044] In this embodiment, a bottom expanding assembly is arranged between the drill shank 1 and the drill bit 2, and the drill shank 1 transmits power to the drill bit 2 with the aid of the bottom expanding assembly. The bottom expanding assembly includes a tool holder top block 3, a tool holder cover 4, a bottom expanding knife 5 and an adjustment assembly. The tool holder top block 3 is connected to the tool holder cover 4, and the drill bit 2 is arranged at the end of the tool holder top block 3. The tool holder top block 3 has an inclined surface, and the tool holder cover 4 has a through hole, which is connected to the inclined surface. There are two bottom expanding knives 5 and two inclined surfaces. The bottom expanding knives 5 correspond to the inclined surfaces one by one, and the bottom expanding knives 5 are located on the inclined surfaces. The adjustment assembly is connected to the bottom expanding knife 5 and is used to push the bottom expanding knife 5 out of the inclined surface or pull it back to the inclined surface.

[0045] The working principle of the non-hammer bottom expanding drill provided by the present invention is as follows: first, the bottom expanding knife 5 is placed on the inclined plane through the adjustment component. When the drill handle 1 rotates, the drill handle 1 drives the drill bit 2 to rotate with the help of the bottom expanding component to perform drilling. After the drilling is completed, the overall rotation is stopped; then the adjustment component directly pushes the bottom expanding knife 5 out, the bottom expanding knife 5 is disengaged from the inclined plane, and then the overall rotation is performed again, and at this time, the bottom expanding of the drilled hole can be completed.

[0046] like Figure 2~Figure 3 As shown, based on the same concept as the above embodiment, this embodiment further proposes that the adjustment component includes:

[0047] The movable pull rod 6 is inserted into the through hole;

[0048] The bottom pipe 17 is hinged to the two bottom expansion knives 5, and the bottom pipe 17 is rotatably connected to the end of the movable pull rod 6;

[0049] The sleeve 7 has an external thread at one end and an internal thread at the other end. The tool holder cover 4 has an external thread. The sleeve 7 is sleeved on the tool holder cover 4 and is threadedly connected to the tool holder cover 4.

[0050] The positioning member has a threaded hole, the sleeve 7 is inserted into the threaded hole and is threadedly connected to the positioning member; the positioning member has a limiting rod 18, the limiting rod 18 has an external thread, the positioning member has a through hole, and the movable pull rod 6 passes through the through hole;

[0051] The plug 8 has a threaded hole, the limiting rod 18 is inserted into the threaded hole, and the plug 8 is threadedly connected to the positioning member;

[0052] The slide block 9 has a through hole, the drill handle 1 is slidably arranged on the slide block 9, and the outer surface of the slide block 9 has a keyway;

[0053] The sliding chamber 10 is arranged outside the sliding block 9 and has a groove, the groove matches the keyway, the sliding chamber 10 is provided with a first synchronization hole, and the sliding chamber 10 is fixedly connected to the drill handle 1;

[0054] The synchronization key 11 is located in the keyway and the groove at the same time. The synchronization key 11 and the cock 8 are both provided with second synchronization holes. The first synchronization holes and the second synchronization holes are the same in number and are coaxially arranged.

[0055] When the plug 8 slides on the limiting rod 18 , the plug 8 drives the drill shank 1 to move axially with the help of the sliding chamber 10 , and the drill shank 1 pushes the movable pull rod 6 to move, and the movable pull rod 6 pushes the two bottom expansion knives 5 apart.

[0056] In this embodiment, the bottom tube is arranged at the end of the movable pull rod 6, and the two bottom expansion knives 5 are hinged to the bottom tube, the bottom tube and the movable pull rod 6 are both arranged in the sleeve 7, the end of the sleeve 7 is connected to the tool holder cover 4, and the space inside the sleeve 7 is connected to the through hole, the positioning piece has a threaded hole, the sleeve 7 has an external thread, the sleeve 7 is threadedly connected to the positioning piece, the sleeve 7 has an internal thread, the tool holder cover 4 has an external thread, the sleeve 7 is threadedly connected to the tool holder cover 4, the positioning piece has a limit rod 18, the limit rod 18 has an external thread, the plug 8 has a threaded hole, and is selectively threadedly connected to the limit rod 18, the slider 9 is sleeved on the drill shank 1 and is slidably connected to the drill shank 1, that is, a hole is opened on the slider 9, and the drill shank 1 is arranged through the hole; a keyway is opened on the outer surface of the slider 9, and a groove is opened on the inner surface of the sliding chamber 10, and the groove is arranged opposite to the keyway, and the synchronization key 11 is located in the keyway and the groove at the same time, and the synchronization key 11 and the plug 8 are on A second synchronization hole is provided on both, and a first synchronization hole is provided on the sliding chamber 10. The first synchronization hole and the second synchronization hole are arranged opposite to each other, and a positioning axis is provided, that is, the sliding chamber 10 maintains synchronous movement with the plug 8 by means of the synchronization key 11. When the plug 8 rotates on the limit rod 18, the plug 8 drives the sliding chamber 10 and the slider 9 to rotate at the same time by means of the synchronization key 11. Since the plug 8 is threadedly connected to the limit rod 18, the plug 8 can move along the axial direction of the limit rod 18. Since the sliding chamber 10 is fixedly connected to the drill shank 1, when the plug 8 moves with the sliding chamber 10, the drill shank 1 also moves along the axial direction of the limit rod 18, and the movement of the drill shank 1 will drive the movable pull rod 6 to move. The movable pull rod 6 can not only rotate but also move. Since the bottom tube is rotatably connected to the movable pull rod 6, the movable pull rod 6 can push the bottom tube to move along the axial direction of the limit rod 18, and finally realize the adjustment component bottom expansion knife 5 to extend or retract from the inclined surface.

[0057] like Figure 1~Figure 3 As shown, based on the same concept as the above embodiment, this embodiment further proposes that the positioning member further has:

[0058] The bearing seat 12 has an internal thread;

[0059] The bearing 13 is disposed in the bearing seat 12, and the inner ring of the bearing 13 is in contact with the sleeve 7;

[0060] The bearing cover 14 has an external thread and is threadedly connected to the bearing seat 12. The bearing 13 is arranged between the bearing seat 12 and the bearing cover 14. The limiting rod 18 is arranged on the bearing seat 12 and passes through the bearing cover 14. The movable pull rod 6 passes through the limiting rod 18 axially, and the limiting rod 18 is connected to the sleeve 7.

[0061] In this embodiment, the positioning member also includes a bearing seat 12, a bearing 13 and a bearing cover 14. Since the positioning member can play a positioning role, that is, when drilling a hole in the ground, the positioning member needs to contact the ground. At this time, the bearing seat 12 is in contact with the ground, and the bearing 13 is arranged on the bearing seat 12, and the sleeve 7 is in contact with the inner ring of the bearing 13. In this way, it can be ensured that when the sleeve 7 rotates, there is no relative movement between the bearing seat 12 and the ground, thereby reducing the friction resistance of the ground to the whole and ensuring smooth drilling. The bearing cover 14 is arranged on the bearing 13 to prevent dust from entering between the bearings 13 and reducing the life of the bearing 13.

[0062] like Figure 1~Figure 3 As shown, based on the same concept as the above embodiment, this embodiment further proposes that the positioning member also has a pressure plate 15, and the pressure plate 15 is arranged between the bearing 13 and the bearing cover 14, and the bearing cover 14 presses the pressure plate 15 on the inner ring of the bearing 13.

[0063] In this embodiment, the pressure plate 15 is arranged on the bearing 13, and the pressure plate 15 is threadedly connected to the sleeve 7. The movable pull rod 6 is arranged through the pressure plate 15. The pressure plate 15 contacts the inner ring of the bearing 13, but does not contact the outer ring of the bearing 13, so that the sleeve 7 can rotate with the inner ring.

[0064] like Figure 1~Figure 3 As shown, based on the same concept as the above embodiment, this embodiment further proposes that the positioning member also has a retaining spring 16, which is arranged between the pressure plate 15 and the bearing cover 14, and the retaining spring 16 is clamped in the bearing seat 12 for axial positioning of the bearing 13 and the pressure plate 15.

[0065] In this embodiment, a retaining spring 16 is provided to play a role in axial positioning of the bearing 13 and the pressure plate 15, thereby preventing the pressure plate 15 from axially moving during the rotation process.

[0066] like Figure 1~Figure 3 As shown, based on the same concept as the above embodiment, this embodiment also proposes that the slider 9, the keyway and the groove are all two and are arranged one to one.

[0067] In this embodiment, the slider 9, the keyway and the groove are all provided in two and are arranged in a one-to-one correspondence, which can reduce the cost and facilitate the manufacturing.

[0068] like Figure 1~Figure 3 As shown, based on the same concept as the above embodiment, this embodiment also proposes that the outer surface of the tap 8 has anti-slip grooves.

[0069] In this embodiment, anti-slip grooves are provided on the outside of the cock 8, which is convenient for operation and can also achieve accurate operation accuracy.

[0070] like Figure 1~Figure 3As shown, based on the same concept as the above embodiment, this embodiment further proposes that the sliding chamber 10 has a large opening at one end and a small opening at the other end, and the end with the small opening is fixedly connected to the drill handle 1.

[0071] In this embodiment, since the diameter of the drill shank 1 is smaller than the diameter of the slide block 9, in order to reduce the overall weight, the slide chamber 10 can be configured to have a larger opening at one end and a smaller opening at the other end.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A non-hammer bottom drill, comprising a drill shank (1) and a drill bit (2), characterized in that: It also comprises a bottom expansion assembly, the drill bit (2) is arranged on the drill shank (1) by means of the bottom expansion assembly; the bottom expansion assembly comprises: The tool holder top block (3) has two inclined surfaces arranged opposite to each other, and the drill bit (2) is arranged at the end of the tool holder top block (3); A tool holder cover (4) is arranged at the other end of the tool holder top block (3), the tool holder cover (4) is provided with a through hole, and the inclined surface faces the through hole; Two bottom expansion knives (5) are symmetrically arranged, and the bottom expansion knives (5) are located on the inclined surface and can be expanded to expand the diameter of the hole; and An adjustment component, disposed between the drill shank (1) and the bottom expanding knife (5) and used for controlling the bottom expanding knife (5) to extend or retract; A movable pull rod (6) is inserted into the through hole; A bottom tube (17) is hingedly connected to the two bottom expansion knives (5), and the bottom tube (17) is rotatably connected to the end of the movable pull rod (6); A sleeve (7) having an external thread at one end and an internal thread at the other end, the tool holder cover (4) having an external thread, the sleeve (7) being sleeved on the tool holder cover (4) and being threadably connected to the tool holder cover (4); The positioning member has a threaded hole, the sleeve (7) is inserted into the threaded hole and is threadedly connected to the positioning member; the positioning member has a limiting rod (18), the limiting rod (18) has an external thread, the positioning member has a through hole, and the movable pull rod (6) passes through the through hole; The plug (8) has a threaded hole, the limiting rod (18) is inserted into the threaded hole, and the plug (8) is threadedly connected to the positioning member; A slider (9) having a through hole, the drill shank (1) being slidably arranged on the slider (9), and the outer surface of the slider (9) having a keyway; A sliding chamber (10) is arranged outside the sliding block (9) and has a groove, the groove matches the keyway, the sliding chamber (10) is provided with a first synchronization hole, and the sliding chamber (10) is fixedly connected to the drill shank (1); A synchronization key (11) is located in both the keyway and the groove, the synchronization key (11) and the cock (8) are both provided with a second synchronization hole, the first synchronization hole and the second synchronization hole are the same in number and are coaxially arranged; When the plug (8) slides on the limiting rod (18), the plug (8) drives the drill shank (1) to move axially with the help of the sliding chamber (10), the drill shank (1) pushes the movable pull rod (6) to move, and the movable pull rod (6) pushes the two bottom expansion knives (5) apart; The positioning member also has: A bearing seat (12) having an internal thread; A bearing (13) is disposed in the bearing seat (12), and an inner ring of the bearing (13) is in contact with the sleeve (7); The bearing cover (14) has an external thread and is threadedly connected to the bearing seat (12); the bearing (13) is arranged between the bearing seat (12) and the bearing cover (14); the limiting rod (18) is arranged on the bearing seat (12) and passes through the bearing cover (14); the movable pull rod (6) passes through the limiting rod (18) in the axial direction; and the limiting rod (18) is connected to the sleeve (7); The sliding chamber (10) has a large opening at one end and a small opening at the other end, and the end with the small opening is fixedly connected to the drill handle (1).

2. The non-hammer bottom drill according to claim 1, characterized in that: The positioning member also has a pressure plate (15), wherein the pressure plate (15) is arranged between the bearing (13) and the bearing cover (14), and the bearing cover (14) presses the pressure plate (15) onto the inner ring of the bearing (13).

3. The non-hammer bottom reamer according to claim 2, characterized in that: The positioning member further comprises a retaining spring (16), wherein the retaining spring (16) is arranged between the pressure plate (15) and the bearing cover (14), and the retaining spring (16) is retained in the bearing seat (12) for axial positioning of the bearing (13) and the pressure plate (15).

4. The non-hammer bottom drill according to claim 1, characterized in that: The slider (9), the keyway, and the groove are all two and are arranged one to one.

5. The non-hammer bottom drill according to any one of claims 1 to 4, characterized in that: The outside of the cock (8) has anti-slip grooves.

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