Drill handle connecting structure of pagoda drill

Abstract

The utility model relates to a pagoda drill handle connecting structure which comprises a drill body and a drill handle, a limiting groove is formed in the rear end of the drill body, a step groove is formed in one end of the limiting groove, and a positioning groove is formed in one end of the step groove. One end of the drill handle is provided with a supporting part, one end of the supporting part is provided with a limiting block, the limiting block is embedded into the limiting groove to achieve rotary limiting, one end of the limiting block is provided with a guide rod, the guide rod is sleeved with a positioning ring and a spring, the positioning ring is in threaded connection with the step groove, one end of the positioning ring is provided with a connecting part, and the thread direction of the connecting part is opposite to that of the positioning ring; one end of the guide rod is rotationally connected with a positioning sleeve which is provided with internal threads; the two ends of the spring abut against the positioning sleeve and the connecting part respectively, so that the spring abuts against the positioning sleeve towards the front end, and the limiting block is kept in the limiting groove. The whole dismounting and mounting operation is simple and convenient, tools are not needed to dismount and mount screws, and the drill bit replacement efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a pagoda drill shank connection structure. Background Technology

[0002] Due to its ability to form multi-diameter holes in a single operation, the pagoda drill has irreplaceable high-efficiency advantages in industries such as sheet metal, automotive, electronics, and piping, making it suitable for batch processing of thin plates with multiple holes. Currently, different machine tools (such as drilling machines, milling machines, and machining centers) require different interface drill shanks (such as straight shanks, Morse taper shanks, HSK tool holders, etc.) for installation. By adopting a replaceable shank structure, the same drill bit can be adapted to various equipment by changing the drill shank, thus eliminating the need to configure a dedicated drill bit for each machine tool, improving flexibility, and reducing tooling costs. Chinese patent document CN202222660015.3 discloses a fracture-resistant high-speed steel straight shank twist drill with a replaceable connector function. In this application, when replacing the connector, it is necessary to use a tool to remove the screw, then rotate the rotating block to disengage the locking block from the embedded groove, and finally remove the locking assembly. The overall structure is relatively complex, resulting in relatively cumbersome operation during installation and disassembly, affecting processing efficiency. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses a pagoda drill shank connection structure, which solves the problem that the existing technology has a relatively complex disassembly and assembly structure between the drill body and the drill shank, resulting in inconvenient operation.

[0004] The specific technical solution is as follows:

[0005] A pagoda drill shank connection structure includes a drill body and a drill shank. The drill body has a polygonal cross-section limiting groove at its rear center. One end of the limiting groove has a stepped groove at its center, with internal threads on its inner wall. Another end of the stepped groove has a polygonal cross-section positioning groove at its center. One end of the drill shank has a support portion with a diameter larger than the limiting groove, which presses against the rear end of the drill body. One end of the support portion has a limiting block adapted to the size and shape of the limiting groove. The limiting block is embedded in the limiting groove to achieve rotational limiting between the drill shank and the drill body. One end of the limiting block has a polygonal cross-section guide rod, on which a positioning ring and a spring are sleeved. The inner wall shape of the positioning ring is similar to that of the guide rod. The outer wall shape of the rod is adapted to the guide rod, allowing the positioning ring to move axially along the guide rod. The outer wall of the positioning ring is provided with an external thread and is connected to the inner wall of the stepped groove by a thread. One end of the positioning ring is provided with an annular connecting part. The side wall of the connecting part is provided with an external thread, and the direction of the external thread of the connecting part is opposite to the direction of the external thread of the positioning ring. One end of the guide rod is rotatably connected to a positioning sleeve that is adapted to the size and shape of the positioning groove. The rear end of the positioning sleeve is sleeved on the outside of the guide rod, and the inner side wall of the positioning sleeve is provided with an internal thread that mates with the external thread of the side wall of the connecting part. The two ends of the spring press against the inner wall of one end of the positioning sleeve and the end wall of the connecting part, respectively, so that the spring presses against the positioning sleeve at the front end and keeps the limiting block in the limiting groove.

[0006] Furthermore, a protrusion is provided on the end face of one end of the guide rod, and a screw hole is opened on the end face of the protrusion. A screw is threaded into the screw hole, and the screw shank is embedded in the screw hole, so that the screw nut and the protrusion form a movable groove. A through hole for accommodating the protrusion and the screw is opened on the end wall of the positioning sleeve, and a movable ring that cooperates with the movable groove is provided on the inner wall of the through hole, so as to realize the rotational connection between the positioning sleeve and the guide rod.

[0007] Furthermore, a gap is left between the two ends of the positioning ring and the two ends of the movable groove.

[0008] Furthermore, the maximum distance between the positioning sleeve and the connecting part is greater than the length of the limiting groove.

[0009] Furthermore, the length of the sidewall of the connecting part is not greater than the length of the sidewall of the positioning ring.

[0010] Furthermore, the length of the inner wall of the positioning sleeve is greater than the length of the outer wall of the connecting part.

[0011] Furthermore, the spring force is greater than the weight of the drill bit.

[0012] The beneficial effects of this utility model are reflected in:

[0013] Compared to existing technologies, in this invention, when disassembling the drill shank and drill bit, the limiting block is disengaged by pulling the drill shank backward, and then the drill shank is rotated to gradually separate the positioning ring from the stepped groove, and finally the drill shank is removed. During installation, the positioning ring is first moved and screwed onto the positioning sleeve at the front end through the connecting part, and then inserted into the drill shank and rotated, so that the positioning ring is gradually screwed onto the stepped groove. At the same time, the positioning sleeve is gradually separated from the connecting part, thus completing the installation and fixing. The overall operation is simple and convenient, without the need to use tools to disassemble and install screws, effectively improving the efficiency of drill bit replacement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0016] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0017] Figure 4 This is a cross-sectional view of the drill body in this utility model.

[0018] Figure 5 This is a schematic diagram of the structure when the drill shank is separated from the drill body in this utility model.

[0019] Explanation of reference numerals in the attached drawings: Drill body 1, Drill shank 2, Limiting groove 101, Step groove 102, Positioning groove 103, Support part 201, Limiting block 202, Guide rod 203, Protrusion 203-1, Screw hole 203-2, Screw 203-3, Movable groove 203-4, Positioning ring 204, Connecting part 204-1, Spring 205, Positioning sleeve 206, Through hole 206-1, Movable ring 206-2. Detailed Implementation

[0020] To make the technical solution of this utility model clearer and more explicit, the utility model will be further described below with reference to the accompanying drawings. Any solution derived by equivalent substitution and conventional reasoning of the technical features of this utility model falls within the protection scope of this utility model. The fixed connections and fixed settings mentioned in this utility model are all common connection methods in the mechanical field, including welding, bolt and nut connections, and screw connections.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Please see the appendix Figure 1-5 This embodiment provides a connection structure for a pagoda drill shank 2, including a drill body 1 and a drill shank 2. A polygonal limiting groove 101 is formed at the center of the rear end of the drill body 1. A circular stepped groove 102 is formed at the center of one end of the limiting groove 101. Internal threads are provided on the inner wall of the stepped groove 102. A polygonal positioning groove 103 is formed at the center of one end of the stepped groove 102. In this embodiment, the cross-sectional shapes of the limiting groove 101 and the positioning groove 103 can be hexagonal, square, or triangular.

[0023] One end of the drill shank 2 is provided with a support part 201 with a diameter larger than that of the limiting groove 101. The support part 201 is used to fit tightly against the rear end of the drill bit to provide support and to cope with the impact force during drilling. The front end center of the support part 201 is provided with a limiting block 202 that is adapted to the size and shape of the limiting groove 101. The limiting block 202 is embedded in the limiting groove 101 to realize the rotational limitation between the drill shank 2 and the drill body 1. The front end center of the limiting block 202 is provided with a guide rod 203 with a polygonal cross section. A positioning ring 204 and a spring 205 are sleeved on the guide rod 203. The inner wall shape of the positioning ring 204 is adapted to the outer wall shape of the guide rod 203, so that the positioning ring 204 can only be displaced along the axial direction of the guide rod 203. The outer wall of the positioning ring 204 is provided with an external thread and is connected to the inner wall of the stepped groove 102 by a thread. The positioning ring 204 and the stepped groove 102 are fixed by screw connection to prevent the drill shank 2 from separating from the drill body 1. One end of the positioning ring 204 is provided with an annular connecting part 204-1. The side wall of the connecting part 204-1 is provided with an external thread, and the direction of the external thread of the connecting part 204-1 is opposite to the direction of the external thread of the positioning ring 204. One end of the guide rod 203 is rotatably connected to a positioning sleeve 206 that is adapted to the size and shape of the positioning groove 103. The rear end of the positioning sleeve 206 is sleeved on the outside of the guide rod 203. The outer wall of the positioning sleeve 206 has a polygonal structure and its inner wall has a circular structure. The inner side wall of the positioning sleeve 206 is provided with an internal thread that matches the external thread of the side wall of the connecting part 204-1, so that the positioning sleeve 206 can be screwed and fixed to the connecting part 204-1 of the positioning ring 204, so as to keep the positioning ring 204 fixed to the front end of the positioning sleeve 206, thereby preventing the limiting block 202 from entering the limiting groove 101. The two ends of the spring 205 press against the inner wall of one end of the positioning sleeve 206 and the end wall of the connecting part 204-1, respectively, so that the spring 205 presses against the positioning sleeve 206 at the front end and ensures that the limiting block 202 can always be in the limiting groove 101, thereby ensuring the rotational limitation between the drill shank 2 and the drill body 1.

[0024] In this embodiment, a protrusion 203-1 is provided on the end face of one end of the guide rod 203. A screw hole 203-2 is opened on the end face of the protrusion 203-1. A screw 203-3 is threadedly connected to the screw hole 203-2. The screw shank of the screw 203-3 is embedded in the screw hole 203-2, so that the nut of the screw 203-3 and the protrusion 203-1 form a movable groove 203-4. A through hole 206-1 for accommodating the protrusion 203-1 and the screw 203-3 is opened on the end wall of the positioning sleeve 206. A movable ring 206-2 that cooperates with the movable groove 203-4 is provided on the inner wall of the through hole 206-1, realizing the rotational connection between the positioning sleeve 206 and the guide rod 203. In this embodiment, a gap is left between the two ends of the positioning ring 204 and the two ends of the movable groove 203-4 to avoid excessive friction between the screw 203-3 and the positioning sleeve 206, which could cause the screw 203-3 to loosen during rotation.

[0025] In this embodiment, the maximum distance between the positioning sleeve 206 and the connecting part 204-1 is greater than the length of the limiting groove 101, thereby ensuring that when the drill shank 2 is pulled backward, after the positioning sleeve 206 contacts the connecting part 204-1, the limiting block 202 has completely disengaged from the limiting groove 101, thus avoiding the problem of the drill shank 2 being unable to rotate.

[0026] In this embodiment, the length of the side wall of the connecting part 204-1 is not greater than the length of the side wall of the positioning ring 204, so as to avoid the problem that the positioning sleeve 206 and the connecting part 204-1 are still not separated after the positioning ring 204 and the stepped groove 102 are screwed into place when the drill shank 2 is installed.

[0027] In this embodiment, the length of the inner wall of the positioning sleeve 206 is greater than the length of the outer wall of the connecting part 204-1, so as to ensure that there is enough space inside the positioning sleeve 206 to accommodate the compressed spring 205.

[0028] The working principle of this utility model is as follows: During disassembly, the drill shank 2 is pulled back and rotated. At this time, the limiting block 202 is disengaged from the limiting groove 101, and the rear end of the positioning sleeve 206 begins to contact the connecting part 204-1 of the positioning ring 204. The guide rod 203 drives the positioning ring 204 to rotate, so that the positioning ring 204 gradually disengages from the stepped groove 102. At the same time, the positioning sleeve 206 gradually screws and fixes itself to the connecting part 204-1. Finally, the positioning ring 204 disengages from the stepped groove 102, completing the separation of the drill shank 2 from the drill body 1.

[0029] During installation, insert the drill shank 2, and the positioning sleeve 206 is embedded in the positioning groove 103, with the positioning ring 204 abutting against one end of the stepped groove 102. Then rotate the drill shank 2. During this process, the positioning sleeve 206 gradually separates from the connecting part 204-1, while the positioning ring 204 gradually connects and is fixed to the stepped groove 102. Then, the positioning sleeve 206 separates from the connecting part 204-1. At this time, under the action of the spring 205, the limiting block 202 is aligned and embedded in the limiting groove 101, and the support part 201 presses against the rear end of the drill body 1 for support.

[0030] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A drill shank connection structure of a drill bit, comprising a drill body and a drill shank, characterized by, The drill body has a polygonal cross-section limiting groove at its rear center. One end of the limiting groove has a stepped groove with internal threads on its inner wall. Another end of the stepped groove has a polygonal cross-section positioning groove. One end of the drill shank has a support portion, and one end of the support portion has a limiting block adapted to the size and shape of the limiting groove. The limiting block is embedded in the limiting groove to achieve rotational limiting between the drill shank and the drill body. One end of the limiting block has a polygonal cross-section guide rod, on which a positioning ring and a spring are fitted. The inner wall shape of the positioning ring matches the outer wall shape of the guide rod, allowing the positioning ring to move axially along the guide rod. The outer wall of the positioning ring has an external thread and is connected to the inner wall of the stepped groove by a thread. One end of the positioning ring has an annular connecting part, and the side wall of the connecting part has an external thread, and the direction of the external thread of the connecting part is opposite to the direction of the external thread of the positioning ring. One end of the guide rod is rotatably connected to a positioning sleeve that is adapted to the size and shape of the positioning groove. The rear end of the positioning sleeve is sleeved on the outside of the guide rod, and the inner side wall of the positioning sleeve has an internal thread that matches the external thread of the side wall of the connecting part. The two ends of the spring press against the inner wall of one end of the positioning sleeve and the end wall of the connecting part, respectively, so that the spring presses against the positioning sleeve at the front end and keeps the limiting block in the limiting groove.

2. A drill shank connection structure of a taper shank drill according to claim 1, wherein The guide rod has a protrusion on one end face, and a screw hole is opened on the end face of the protrusion. A screw is threaded into the screw hole, and the screw shank is embedded in the screw hole, so that the screw nut and the protrusion form a movable groove. The end wall of the positioning sleeve has a through hole for accommodating the protrusion and the screw. The inner wall of the through hole has a movable ring that cooperates with the movable groove, so as to realize the rotational connection between the positioning sleeve and the guide rod.

3. A drill shank connection structure of a taper shank drill according to claim 2, wherein There is a gap between the two ends of the positioning ring and the two ends of the movable groove.

4. A drill shank connection structure of a taper shank drill according to claim 1, wherein The length of the sidewall of the connecting part is not greater than the length of the sidewall of the positioning ring.

5. A drill shank connection structure of a taper shank drill according to claim 4, wherein The length of the connecting part is equal to the length of the stepped groove.

6. A drill shank connection structure of a taper point drill according to claim 5, wherein The length of the inner wall of the positioning sleeve is greater than the length of the outer wall of the connecting part.

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