Center hole drilling device

Abstract

The utility model relates to the technical field of drilling equipment, in particular to a center hole drilling device which is used for drilling a workpiece and comprises a hand drill stand and a three-jaw chuck which are sequentially arranged from top to bottom and connected into a whole through a connecting piece. A drill bit is rotationally arranged at the position, corresponding to the axis of the three-jaw chuck, of the hand drill floor, the drill bit can reciprocate in the vertical direction, the workpiece is locked and fixed through the three-jaw chuck, and the axis of the three-jaw chuck is kept the same as the axis of the workpiece. According to the technical scheme, a center hole is formed in a large workpiece which is difficult to move, the workpiece is large in size and weight and serves as a fulcrum, when the three-jaw chuck and the workpiece are coaxially installed, the three-jaw chuck and the hand drill floor cannot topple down due to the weight of the workpiece, and due to the fact that a drill bit and the three-jaw chuck are the same in axis, the drill bit cannot topple down. And at the moment, the center of the workpiece can be accurately drilled by pressing down the drill bit, and the efficiency and precision are high.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a center hole drilling device. Background Art

[0002] In daily production processes, it is often necessary to drill various hard material workpieces. In drilling operations, especially center hole processing, extremely high processing precision and accuracy are required.

[0003] The patent document with patent publication number: CN209551207U discloses a center hole drilling machine, including a frame, on which a hydraulic system, an electrical system and a lubrication and cooling system are provided; the center hole drilling machine provided by this solution adopts a simple design, reduces redundant parts of the equipment, reduces the probability of equipment failure, reduces the production cost and maintenance cost of the drilling machine, and enhances the specialization of the drilling machine, so as to greatly improve production efficiency and reduce overall production costs.

[0004] The above scheme is specially designed for pre-drilling with low processing accuracy requirements. When in use, the workpiece is placed on the drilling position of the frame. However, there are some workpieces that are not only hard but also high in height. Firstly, there is no suitable equipment to process them, and secondly, it is difficult to place them on the drilling position of the equipment, resulting in low drilling efficiency. Utility Model Content

[0005] In order to overcome the above-mentioned technical problems, the purpose of the utility model is to provide a center hole drilling device, which solves the problems of low precision and slow drilling efficiency when drilling the center of a large workpiece.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A center hole drilling device is used for drilling a workpiece, comprising a hand-operated drill platform and a three-jaw chuck arranged in sequence from top to bottom, the hand-operated drill platform and the three-jaw chuck are connected as a whole through a connecting piece, a drill bit is rotatably arranged on the hand-operated drill platform corresponding to the axis of the three-jaw chuck, the drill bit can reciprocate in the vertical direction, the workpiece is locked and fixed by the three-jaw chuck, and the axis of the three-jaw chuck and the workpiece are kept the same, and then the drill bit is driven downward to drill a hole in the center of the workpiece.

[0008] Furthermore, the workpiece is an axisymmetric structure.

[0009] Furthermore, the drill bit is installed at the front end of the hand-cranked drill platform, a motor for providing power to the drill bit is installed at the rear end of the hand-cranked drill platform, and a crank for controlling the lifting of the drill bit is also installed on the side of the hand-cranked drill platform.

[0010] Furthermore, the three-jaw chuck includes a mounting ring and a transmission assembly arranged inside the mounting ring, the transmission assembly is linked with three clamping jaws arranged at the bottom of the mounting ring, a through hole is opened on the side of the mounting ring, a rotating rod is detachably connected to the through hole, and the rotating rod can be linked with the transmission assembly after being inserted into the through hole, thereby controlling the clamping jaws to move in the direction toward or away from the axis of the mounting ring.

[0011] Furthermore, the connecting member includes an annular portion and an arc-shaped portion, the bottom of the hand-cranked drilling platform is connected to a flange ring through a connecting column, the top surface of the annular portion fits with the bottom surface of the flange ring, and the two are connected together through bolt threads, the bottom surface of the arc-shaped portion fits with the top surface of the mounting ring, and the two are connected together through bolt threads.

[0012] Furthermore, the rotating rod is in a T-shaped structure, which is convenient for holding.

[0013] Furthermore, the contact surface between the clamping jaw and the workpiece is provided with anti-slip grooves.

[0014] Beneficial effects of the utility model:

[0015] This technical solution is designed for opening center holes in large and difficult-to-move workpieces. It changes the previous processing method and controls the three-jaw chuck to lock the workpiece through manpower or equipment. Since the workpiece itself is large in size and heavy in weight, it acts as a fulcrum. When the three-jaw chuck is installed coaxially with the workpiece, the weight of the workpiece itself prevents the three-jaw chuck and the hand-cranked drill table from tipping over. Since the drill bit and the three-jaw chuck have the same axis, pressing down the drill bit can accurately drill a hole in the center of the workpiece. This has high efficiency and precision, and is of great help in opening center holes in large workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a side view of the utility model;

[0018] Figure 2 It is a three-dimensional view of the utility model;

[0019] Figure 3 It is a three-dimensional view of the workpiece in the utility model;

[0020] Figure 4 It is a three-dimensional view of the three-jaw chuck in the utility model;

[0021] Figure 5 It is a three-dimensional view of the connecting piece in the utility model.

[0022] In the figure: 1. hand-cranked drill table; 11. drill bit; 12. motor; 13. crank; 14. connecting column; 15. flange ring; 2. three-jaw chuck; 21. mounting ring; 22. transmission assembly; 23. clamping jaws; 3. connecting piece; 31. annular portion; 32. arc portion; 33. bolt; 4. rotating rod; 5. workpiece. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a center hole drilling device is used for drilling a workpiece 5, including a hand-cranked drill platform 1 and a three-jaw chuck 2 arranged in sequence from top to bottom, the hand-cranked drill platform 1 and the three-jaw chuck 2 are connected as a whole through a connecting piece 3, the hand-cranked drill platform 1 and the three-jaw chuck 2 are both mature technologies on the market, and this solution can be used directly. The advantages of the two are that, on the one hand, the hand-cranked drill platform 1 has low cost and high torque, and can be used for drilling a workpiece 5 with high hardness, and on the other hand, the hand-cranked drill platform 1 and the three-jaw chuck 2 are relatively light in weight, and are less difficult to move whether using mechanical equipment or manpower.

[0025] like Figure 3 As shown, in the present scheme, the workpiece 5 whose center hole is to be machined is an axisymmetric structure, such as a cylinder, a conical column, a square column, etc. When the three-jaw chuck 2 fixes the workpiece 5 with an axisymmetric structure, after the fixation is completed, the axis of the three-jaw chuck 2 naturally coincides with the center of the workpiece 5, which is beneficial to the center hole machining and reduces the time for determining the position of the center hole.

[0026] like Figure 1 , Figure 2 As shown, a drill bit 11 is installed at the front end of the hand-cranked drill platform 1, and the drill bit 11 can reciprocate in the vertical direction. A motor 12 for providing power to the drill bit 11 is installed at the rear end of the hand-cranked drill platform 1. A crank 13 for controlling the lifting of the drill bit 11 is also installed on the side of the hand-cranked drill platform 1. Turning the crank 13 can drive the drill bit 11 to rise or fall, thereby drilling a hole in the workpiece 5 below.

[0027] like Figure 2 , Figure 4As shown, the three-jaw chuck 2 includes a mounting ring 21 and a transmission assembly 22 arranged inside the mounting ring 21. The transmission assembly 22 is linked with three clamping jaws 23 arranged at the bottom of the mounting ring 21. A through hole is opened on the side of the mounting ring 21, and a rotating rod 4 is detachably connected in the through hole. After the rotating rod 4 is inserted into the through hole, it can be linked with the transmission assembly 22, thereby controlling the clamping jaws 23 to move along the direction toward or away from the axis of the mounting ring 21.

[0028] In this solution, the contact surface between the clamping jaws 23 and the workpiece 5 is provided with anti-slip grooves, which further increases the stability of the fixation between the three-jaw chuck 2 and the workpiece 5.

[0029] The rotating rod 4 in this solution is in a T-shaped structure, which is convenient for the staff to hold when rotating to avoid hand slipping.

[0030] like Figure 5 As shown, the connecting member 3 includes an annular portion 31 and an arcuate portion 32. The bottom of the hand-cranked drill stand 1 is connected to a flange ring 15 via a connecting column 14. The top surface of the annular portion 31 fits with the bottom surface of the flange ring 15, and the two are threadedly connected together via bolts 33. The bottom surface of the arcuate portion 32 fits with the top surface of the mounting ring 21, and the two are threadedly connected together via bolts 33, thereby assembling the hand-cranked drill stand 1 and the three-jaw chuck 2 into one.

[0031] When in use, move the three-jaw chuck 2 to the top of the workpiece 5, and then lower the three-jaw chuck 2 so that the bottom surface of the mounting ring 21 fits against the top of the workpiece 5, and the three jaws 23 surround the workpiece 5. At this time, the rotating rod 4 can be inserted into the through hole and rotated to drive the three jaws 23 to abut against the outer wall of the workpiece 5, so as to achieve the locking and fixation of the three-jaw chuck 2 and the workpiece 5, and keep the axis of the three-jaw chuck 2 and the workpiece 5 the same. At this time, the crank 13 can be shaken and the motor 12 can be started, and the drill bit 11 can be moved downward to drill a hole in the center of the workpiece 5.

[0032] This solution is designed for opening a center hole in a large and difficult-to-move workpiece 5. The previous processing method is changed. The three-jaw chuck 2 is locked with the workpiece 5 by manpower or equipment control, instead of moving the workpiece 5 to the place to be processed. Since the workpiece 5 itself is large in size and heavy, it is difficult to move and acts as a fulcrum. When the three-jaw chuck 2 is coaxially installed with the workpiece 5, the weight of the workpiece 5 itself prevents the three-jaw chuck 2 and the hand-cranked drill table 1 from tipping over. Since the drill bit 11 has the same axis as the three-jaw chuck 2, the drill bit 11 can be pressed down to accurately drill the center of the workpiece 5, with high efficiency and precision, which is of great help in opening the center hole of a large workpiece 5.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] The above contents are merely examples and explanations of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A center hole drilling device for drilling a workpiece, characterized in that: The utility model comprises a hand-operated drill platform and a three-jaw chuck which are sequentially arranged from top to bottom, the hand-operated drill platform and the three-jaw chuck are connected as a whole through a connecting piece, a drill bit is rotatably arranged on the hand-operated drill platform corresponding to the axis center of the three-jaw chuck, the drill bit can reciprocate in the vertical direction, the workpiece is locked and fixed by the three-jaw chuck, and the axis centers of the three-jaw chuck and the workpiece are kept the same, and then the drill bit is driven downward to drill a hole in the center of the workpiece.

2. A center hole drilling device according to claim 1, characterized in that: The workpiece is an axisymmetric structure.

3. A center hole drilling device according to claim 1, characterized in that: The drill bit is installed at the front end of the hand-cranked drill platform, and a motor for providing power to the drill bit is installed at the rear end of the hand-cranked drill platform. A crank for controlling the lifting of the drill bit is also installed on the side of the hand-cranked drill platform.

4. A center hole drilling device according to claim 1, characterized in that: The three-jaw chuck includes a mounting ring and a transmission assembly arranged inside the mounting ring. The transmission assembly is linked with three clamping jaws arranged at the bottom of the mounting ring. A through hole is opened on the side of the mounting ring. A rotating rod is detachably connected to the through hole. After the rotating rod is inserted into the through hole, it can be linked with the transmission assembly, thereby controlling the clamping jaws to move in the direction toward or away from the axis of the mounting ring.

5. A center hole drilling device according to claim 4, characterized in that: The connecting piece includes an annular portion and an arc-shaped portion. The bottom of the hand-cranked drilling platform is connected to a flange ring through a connecting column. The top surface of the annular portion fits with the bottom surface of the flange ring, and the two are connected together through bolt threads. The bottom surface of the arc-shaped portion fits with the top surface of the mounting ring, and the two are connected together through bolt threads.

6. A center hole drilling device according to claim 4, characterized in that: The rotating rod is in a T-shaped structure, which is convenient for holding.

7. A center hole drilling device according to claim 4, characterized in that: The contact surface between the clamping jaw and the workpiece is provided with anti-slip grooves.

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