CN212443384U

CN212443384U - Planetary shaft square hole drill

Info

Publication number: CN212443384U
Application number: CN202021005885.1U
Authority: CN
Inventors: 邱林宾; 金纯�; 马飞
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-02-02
Anticipated expiration: 2030-06-04

Abstract

The utility model provides a planetary wheel rotating shaft square hole drill bit, which belongs to the technical field of drill bit design. The drill bit includes a rotating shaft, a drill rod, a pinion, a center wheel and a drill bit, the rotating shaft is connected with the drill rod through the pinion gear, the drill bit is connected below the drill rod, and the pinion gear meshes with the center wheel. The drill uses the planetary gear mechanism to improve the transmission device of the existing square hole drill bit, so that when the drill bit rotates, the transmission mechanism has faster speed, higher efficiency and better stability. The triangular section drill pipe will occupy a square area. In order to improve the efficiency, first use an ordinary twist drill to drill a round hole with a diameter smaller than the side length of the square hole at the part of the workpiece that needs to be machined with a square hole, and then drill it with a square hole drill. Square hole. The utility model has reasonable design and strong operability, can improve efficiency, save time, and meet technological requirements.

Description

Planetary gear rotating shaft square hole drill bit

Technical Field

The utility model relates to a drill bit design technical field especially indicates a planet wheel pivot square hole drill bit.

Background

The Lelo triangle is called as a circular triangle, and is first discovered by a mechanist and a mathematician, so the name is got. The lelobromic shape with width a is a circular triangle Δ ABC made with the side length a of the regular triangle, and has the same width as the circle with diameter a. When it is put in a square with a side length of a to rotate, each side of the square has only one common point, and the connecting lines of the common points of the two sides are mutually vertical. Because the Lelo triangle rotates in a square with the side length equal to the width of the triangle, four points contact with the four sides of the square at any time and the positions of the contact points are changed continuously, a mechanist Lelo designs the inspiration of a square hole drill, and the mechanist is prompted to create the square hole drill.

At present, there is not the drill bit that can directly drill out the square hole on the market, need adopt multiple processing mode just can process if need process the square hole, the utility model discloses can directly drill out the square hole, convenient and fast.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a planet wheel pivot square hole drill bit combines planet wheel movement track design, utilizes planet wheel mechanism to improve the transmission of current square hole drill bit, makes the drill bit at the rotation during operation, and drive mechanism has faster speed, higher efficiency and better stability.

The drill bit comprises a rotating shaft, a pinion, a center wheel, a drill bit and a drill rod, wherein the rotating shaft is connected with the drill rod through the pinion, the drill bit is connected below the drill rod, and the pinion is meshed with the center wheel.

The rotating shaft is a planet wheel rotating shaft which penetrates through the center of the pinion and is vertically connected with the pinion.

When the drill bit is used, a common twist drill is used for drilling a round hole with the diameter smaller than the side length of the square hole, and then the drill bit is used for drilling the square hole.

The drill rod revolution angular velocity omega exists in the central motion track of the drill rod in the motion process of the drill rod₂Equal to three times of rotational angular velocity omega₁The kinematic relationship of (1). If the circle is used to replace the movement track of the center of the drill rod, the movement relationship can adopt a pair of componentsThe circle diameter ratio is 4: 3, inner gearing cylindrical spur gear.

The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:

among the above-mentioned scheme, planet wheel drilling rod pivot makes the drilling rod move fast, steady, high-efficient and improve ultimate strength in drilling course of working, compare with current crosshead shoe mechanism and overcome the rotational speed slow, vibrations are big, the shortcoming at the bottom of the inefficiency, the load, the square hole drill bit of design is based on ordinary drilling machine size, can install on ordinary drilling machine platform, can make the user need not purchase power equipment in addition, can alleviate constructor's intensity of labour, accelerate construction speed, reduce construction cost.

Drawings

FIG. 1 is a schematic structural diagram of the device of the present invention;

FIG. 2 is a schematic diagram of a Lelo triangle of the drill bit of the present invention;

FIG. 3 is a movement trace diagram of the center of the drill spindle according to the present invention;

FIG. 4 is a schematic transmission diagram of the central track control part of the drill rod of the utility model;

FIG. 5 is a three-dimensional modeling diagram of the drill of the present invention;

fig. 6 is a diagram of the edge of the drill of the present invention.

Wherein: 1-rotating shaft, 2-pinion, 3-center wheel, 4-drill bit and 5-drill rod.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The utility model provides a planet wheel pivot square hole drill bit.

As shown in fig. 1 and 4, the drill comprises a rotating shaft 1, a pinion 2, a center wheel 3, a drill 4 and a drill rod 5, wherein the rotating shaft 1 is connected with the drill rod 5 through the pinion 2, the drill 4 is connected below the drill rod 5, and the pinion 2 is meshed with the center wheel 3.

The rotating shaft 1 is a planet wheel rotating shaft which penetrates through the center of the pinion 2 and is vertically connected with the pinion 2.

The specific design scheme of the drill bit is as follows:

referring to fig. 2, a rectangular coordinate system xOy is made with the initial position of the center of the lelo triangle as the origin O.

Wherein theta represents the rotated angle of the Lelo triangle, omega represents the rotational angular velocity, r represents the side length of the Lelo triangle, x and y represent the coordinate of the central locus of the Lelo triangle, and a is the side length of the Lelo triangle.

Let the Lailou triangle be omega₁Clockwise rotation at a constant speed around the symmetrical center (origin o) of the rotor, starting: theta₀＝60°。

After t time of rotation, the rotated angle theta is equal to theta₀+ω₁t

The square movement characteristics are as follows: horizontal direction: δ x ═ OB-OB · cos ω t

＝r(1-cosωt)

The vertical direction is as follows: δ y equal to OA · sin60-OA · sin (60+ ω t)

＝r[sin60-sin(60+ωt)]

Wherein δ X is the displacement of the center of the lyocell triangle in the X direction, δ Y is the displacement of the center of the lyocell triangle in the Y direction, OB is the distance from the center of the lyocell triangle to the corner, and OA is the distance from the center of the lyocell triangle to the corner;

consider a square as a stationary, uniformly rotating reuleaux triangle at an angular velocity of omega. Then the central locus of the Lelo triangle is

Converting the parameter equation into a track equation:

based on the above formula reasoning, as shown in fig. 3, the motion trajectory of the center of the rotation axis of the drill is similar to a circle, and the motion trajectory is obtained according to the respective corresponding intervals of the motion trajectory equation of the center of the rotation axis, where the corresponding intervals are:

it can be seen from fig. 3 that instead of an actual trajectory of the drill rod center, an ideal circle may be used. Considering that the drill rod rotates and simultaneously has the revolution around the center of the corresponding square with the same width, the trial-adoption planetary gear mechanism realizes the movement.

The drill rod revolution angular velocity omega exists in the central track of the drill rod in the movement process of the drill rod₂Equal to three times of rotational angular velocity omega₁The kinematic relationship of (1). If a circle is used to replace the movement track of the center of the drill rod, the movement relation can adopt a pair of reference circle diameter ratios of 4: 3, and the transmission diagram is shown in figure 4.

In the actual design process, the planet wheel rotating shaft penetrates through the center of the pinion and is vertically connected with the pinion; the pinion is positioned in the center of the central wheel and rotates together with the planet wheel rotating shaft; the center wheel plays a role in connecting and supporting in the whole drill bit, and the lower end of the center wheel is connected with the drill bit; the drill bit is connected at the lowermost end, under the drive of planet wheel pivot, drills out the square hole.

When the planet carrier (rotating shaft) rotates at a constant speed, the Lelo triangular section drill rod occupies a square surface area. Four sides of the circular arc have certain circular angles, coordinates of all points of the circular arc are derived by utilizing an Adams data derivation function, and a circular arc curve is drawn as shown in figure 6.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A planetary wheel rotating shaft square hole drill, characterized in that: it comprises a rotating shaft (1), a pinion (2), a center wheel (3), a drill bit (4) and a drill rod (5), and the rotating shaft (1) passes through a small The gear (2) is connected with the drill rod (5), the drill bit (4) is connected below the drill rod (5), and the pinion gear (2) is meshed with the center wheel (3).

2. The planetary wheel rotating shaft square hole drill bit according to claim 1, characterized in that: the rotating shaft (1) is a planetary wheel rotating shaft, and the planetary wheel rotating shaft passes through the center of the pinion (2) and is vertically connected to the pinion (2). .

3. The planetary wheel rotating shaft square hole drill bit according to claim 1 is characterized in that: when the drill bit is in use, first use a common twist drill to drill a circular hole with a diameter smaller than the side length of the square hole, and then drill the square hole with a drill bit.

4. planetary wheel rotating shaft square hole drill bit according to claim 1, is characterized in that: in described drill pipe (5) movement process, drill pipe (5) center motion track exists drill pipe revolution angular velocity ω ₂ is equal to three times of rotation The kinematic relationship of the angular velocity _ω1 .

5. The planetary wheel rotating shaft square hole drill bit according to claim 4, characterized in that: when the center motion trajectory of the drill rod (5) is replaced by a circle, the motion relationship adopts a pair of indexing circles with a diameter ratio of 4:3. Internal meshing cylindrical spur gears are realized.