Drill bit dismounting structure of hole puller

Abstract

The utility model is applicable to the technical field of metal pipe hole drawing, and provides a drill bit dismounting structure of a hole drawing device, which comprises a drill handle, a drill bit and a bolt, a mounting cavity is axially formed in the center of the front end of the drill handle, the rear end of the drill bit is inserted into the front end of the mounting cavity, and the bolt is inserted into the mounting cavity. And the bolt penetrates through the pin hole and the through hole to mount the drill bit on the drill handle. According to the drill bit disassembling structure of the hole puller, the drill handle is arranged to be of a hollow structure, after the rear end of the drill bit is inserted into the drill handle, the drill bit is fixed through the radial plug pin to achieve installation, detachable connection of the drill bit and the drill handle is achieved, and when the drill bit needs to be replaced, the drill bit can be independently replaced while the drill handle is reserved; and the manufacturing material of the drill bit is kept unchanged, and the other parts can be made of low-cost materials, so that the production cost of enterprises is reduced, and the resource waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metal pipe hole pulling technical field especially relates to a drill bit dismounting structure of hole puller. BACKGROUND

[0002] The hole pulling process is a processing method for making a horn mouth by expanding the inner diameter of a pipe, enlarging the inner diameter of the pipe or increasing the pipe interface matching degree. The pipeline system of aerospace, automobile, air conditioner, refrigerator and solar water heater is composed of a main pipe and a branch pipe. In order to improve the stability of the main pipe and the branch pipe after welding, the main pipe needs to be pulled after drilling. The existing automatic hole pulling equipment clamps the drill bit on the driving spindle to drill a hole. After drilling, the conical rotating seat assembly with double helical lines is rotated by the servo motor, and then the two rotating pulling needles are pushed out to a certain size of the drill bit. The spindle rotates upward to turn over the shoulder part for convenient welding of the branch pipe.

[0003] The drill bit of the existing hole pulling equipment is a whole structure, that is, the drill handle and the drill bit are a whole, and cannot be disassembled and separated. When the drill bit needs to be replaced due to wear, the drill handle also needs to be replaced, which is high in cost and causes material waste. Therefore, a hole pulling drill bit structure that can replace the drill bit alone is needed. UTILITY MODEL CONTENTS

[0004] The utility model provides a drill bit dismounting structure of hole puller, aims at solving the problems that the existing hole pulling drill bit is a whole structure, cannot be disassembled and separated, when the drill bit needs to be replaced due to wear, the drill handle also needs to be replaced, and the cost is high.

[0005] The utility model is realized in this way, a drill bit dismounting structure of hole puller, including drill handle, drill bit, and plug pin, the center of drill handle front end forms an installation cavity along the axial direction, the rear end of drill bit is equipped with a through hole along the radial direction, and the rear end of drill bit is inserted into the front end of installation cavity, the front end of drill handle is equipped with a pin hole along the radial direction in the position corresponding to the through hole, the plug pin passes through the pin hole and the through hole and installs the drill bit on the drill handle.

[0006] Preferably, the installation cavity penetrates to the tail end of the drill handle, a thimble is arranged in the installation cavity for clamping the drill bit, and a clamping screw is arranged at the rear end of the installation cavity for abutting against the thimble.

[0007] Preferably, the clamping screw is a machine screw with external threads on the surface, and the inner wall of the rear end of the installation cavity is provided with threads matched with the clamping screw.

[0008] Preferably, the front end of the drill handle is movably provided with a hole pulling needle on each side, the hole pulling needle and the axial direction of the drill handle form an angle, and the end portions of the two hole pulling needles are staggered and penetrate the drill bit.

[0009] Preferably, one end of the bolt is provided with a bolt buckle.

[0010] Advantages

[0011] Compared with the prior art, the beneficial effects of the drill bit dismounting structure of the hole pulling device are as follows: the drill shank is arranged as a hollow structure, the drill bit is inserted into the drill shank, the drill bit is fixed by the bolt to realize installation, the drill bit and the drill shank are detachably connected, the drill bit can be replaced while the drill shank is reserved when the drill bit needs to be replaced, the manufacturing material of the drill bit remains unchanged, the rest can be made of low-cost materials, the production cost of the enterprise is reduced, and resource waste is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a structural schematic view of the utility model;

[0013] Fig. 2 It is a sectional view structural schematic view of the utility model;

[0014] Fig. 3 It is a sectional view structural schematic view of the utility model after the bolt is installed in place;

[0015] In the drawing: 1-drill shank, 2-drill bit, 3-pin hole, 4-hole pulling needle, 5-thimble, 6-tightening screw, 7-bolt. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below by combining with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0017] Please refer to Figs. 1-3 The utility model provides a technical scheme: a drill bit dismounting structure of hole pulling device, including drill shank 1, drill bit 2 and bolt 7, the front end center of drill shank 1 forms an installation cavity along the axial direction, the rear end of drill bit 2 is provided with a through hole along the radial direction, and the rear end of drill bit 2 is inserted into the front end of installation cavity, the front end of drill shank 1 is provided with a pin hole 3 along the radial direction in the position corresponding to the through hole, and bolt 7 passes through pin hole 7 and the through hole to install drill bit 2 on drill shank 1.

[0018] In the embodiment, the drill shank 1 is arranged as a hollow structure, the drill bit 2 is inserted into the drill shank 1, the drill bit 2 is fixed by the bolt 7 to realize installation, the drill bit 2 and the drill shank 1 are detachably connected, the drill bit 2 can be replaced while the drill shank 1 is reserved when the drill bit 2 needs to be replaced, the production cost of the enterprise is reduced, and resource waste is reduced.

[0019] Further, the installation cavity penetrates to the tail end of the drill handle 1, and a center pin 5 for clamping the drill bit 2 is arranged in the installation cavity.

[0020] In the embodiment, since the drill bit 2 is connected with the drill handle 1 through the latch 7, there is a gap between the through hole and the latch, which may cause the connection to be not tight enough, resulting in a small movement space of the drill bit 2 in the axial direction, and therefore the center pin 5 is arranged to clamp the drill bit 2 forwardly to prevent the movement of the drill bit 2, thereby ensuring the stability of the drill bit 2.

[0021] During installation, the drill bit 2 is installed in place, and then the center pin 5 and the clamping screw 6 are sequentially installed from the rear end of the installation cavity, and the clamping screw 6 is tightened to clamp the center pin 5 forwardly, thereby clamping the drill bit 2.

[0022] The specification of the center pin 5 should be matched with the size of the installation cavity, so that the center pin 5 can be installed in the installation cavity and does not move in the installation cavity.

[0023] Further, the clamping screw 6 is a machine screw with external threads on the surface, and the inner wall of the rear end of the installation cavity is provided with threads matched with the clamping screw 6.

[0024] In the embodiment, the clamping screw 6 has a columnar shape, and the rear end is a hexagonal groove, which is convenient for installation and fixation.

[0025] Further, two pull-out pins 4 are movably arranged on the two sides of the front end of the drill handle 1, respectively, the pull-out pins 4 are at an angle with the axial direction of the drill handle 1, and the end portions of the two pull-out pins 4 penetrate the drill bit 2 in a staggered manner.

[0026] In the embodiment, during the process that the drill bit 2 enters the hole on the pipeline, the end portions of the pull-out pins 4 are received in the drill bit 2, and after entering the pipeline, the pull-out pins 4 are stretched out from the surface of the drill bit 2, and then the drill bit 2 is rotated and retreated, so that the hole is turned to the shoulder shape through the pull-out pins 4, and the hole pulling-out is completed. This part of the technical scheme is the prior art, and reference can be made to the prior patent with the publication number CN216966354U of the company, and no further description is made here.

[0027] Further, the latch 7 is provided with a latch buckle at one end. The latch buckle prevents the latch 7 from falling off under the action of centrifugal force during the overall rotation of the drill bit.

[0028] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A drill bit disassembly structure for a hole extractor, characterized in that: The device includes a drill shank (1), a drill bit (2), and a pin (7). The drill shank (1) has an axially oriented mounting cavity at its front end center. The drill bit (2) has a radially oriented through hole at its rear end, and the rear end of the drill bit (2) is inserted into the front end of the mounting cavity. The drill shank (1) has a radially oriented pin hole (3) at the position corresponding to the through hole at its front end. The pin (7) passes through the pin hole (3) and the through hole to mount the drill bit (2) onto the drill shank (1).

2. The drill bit disassembly structure for a hole extractor as described in claim 1, characterized in that: The mounting cavity extends rearward to the tail end of the drill shank (1). A push pin (5) is provided inside the mounting cavity to press against the drill bit (2). A tightening screw (6) is provided at the rear end of the mounting cavity to press against the push pin (5).

3. The drill bit disassembly structure for a hole extractor as described in claim 2, characterized in that: The tightening screw (6) is a nut screw with external threads on its surface, and the inner wall of the rear end of the mounting cavity is provided with threads that are compatible with the tightening screw (6).

4. The drill bit disassembly structure for a hole extractor as described in claim 1, characterized in that: A hole-pulling pin (4) is movably provided on both sides of the front end of the drill shank (1). The hole-pulling pin (4) forms an angle with the axial direction of the drill shank (1), and the ends of the two hole-pulling pins (4) intersect each other through the drill bit (2).

5. The drill bit disassembly structure for a hole extractor as described in claim 1, characterized in that: One end of the pin (7) is provided with a pin buckle.

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