阅读说明：本技术 搅拌桩钻头 (Stirring pile drill bit ) 是由 王金龙 吴瑜 于 2020-05-14 设计创作，主要内容包括：本发明涉及一种钻头,具体涉及一种搅拌桩钻头。其包括连接柱,所述连接柱的上端连接有两层叶片,连接柱的下端设有钻头体,所述钻头体的下端设有横截面为三角形的钻尖部,位于下层的叶片的下端连接有多个用于将大颗粒固态物体向外拨动的耙钉。本发明通过将钻头结构设置带有钻尖部以及切割部可有效切割硬土；其次叶片的下端连接有耙钉,通过耙钉将切碎的硬土及碎石拨开,提高钻进效率。(The invention relates to a drill bit, in particular to a drill bit for a mixing pile. The scraper comprises a connecting column, wherein the upper end of the connecting column is connected with two layers of blades, the lower end of the connecting column is provided with a drill bit body, the lower end of the drill bit body is provided with a drilling tip part with a triangular cross section, and the lower end of the blade positioned on the lower layer is connected with a plurality of raking nails used for outwards stirring large-particle solid objects. The invention can effectively cut hard soil by arranging the drill bit structure with the drill tip part and the cutting part; and secondly, the lower ends of the blades are connected with raking nails, and the chopped hard soil and crushed stones are spread through the raking nails, so that the drilling efficiency is improved.)

1. Stirring stake drill bit, it includes the spliced pole, the upper end of spliced pole is connected with two-layer blade, and the lower extreme of spliced pole is equipped with bit body, its characterized in that: the lower extreme of drill bit body is equipped with the drilling tip portion that the cross section is triangle-shaped, and the lower extreme of the blade that is located the lower floor is connected with a plurality of raking nails that are used for outwards stirring large granule solid-state object.

2. The mixing pile drill bit of claim 1, wherein: the two sides of the upper end of the drilling tip part are respectively provided with a cutting part.

3. The mixing pile drill bit of claim 1, wherein: the lower blade is divided into a left lower blade and a right lower blade by the connecting column; the harrow nails connected with the left lower blade are left harrow nails, and the harrow nails connected with the right lower blade are right harrow nails; the distance between any left rake nail and the axis of the connecting column is different from the distance between any right rake nail and the axis of the connecting column.

4. The mixing pile drill bit of claim 1, wherein: the rake nails and/or the drill tip part are/is connected with a diamond compact.

5. The mixing pile drill bit of claim 1, wherein: the harrow nails are obliquely arranged.

6. The mixing pile drill bit of claim 5, wherein: the number of the harrow nails is n, namely a first harrow nail, a second harrow nail and an … … nth harrow nail from left to right; the inclination angle of each rake nail is a1, a2 and … … an respectively; the lengths of the harrow nails are respectively L1, L2 and … … Ln in sequence; the Ti = Li cos (ai) projected to the length direction of the blade on one side of the rake nail is 0< i < (n + 1); i is a natural number; the maximum distance between the rake nails and the axis of the connecting column is M; t1+ T2+ … … + Tn > = M, the faces covered by all the rake finger travel tracks are connected to form one annular groove when the connecting column is rotated one revolution.

7. The mixing pile drill bit of claim 1, wherein: the upper end of the harrow nail is provided with a connecting column which is hinged with the blades through the connecting column, the connecting column is sleeved with a torsional spring, and the torsional spring is respectively connected with the connecting column and the blades.

Technical Field

The invention relates to a drill bit, in particular to a drill bit for a mixing pile.

Background

When building the building on the ground, need pile on the ground, cement stirring stake is the equipment commonly used that soft base was handled in the foundation engineering construction, use cement as the principal agent of curing agent, utilize stirring stake to spout cement into the soil body and intensive mixing, make cement and earth take place a series of physical chemistry reaction, the weak soil induration reaches the intensity that provides the ground, and the inside soil layer structure of ground distributes diversely, when the lithosphere appears in the soil layer structure, because the hardness of the soil body, frictional resistance is great, make ordinary drill bit structure be difficult to effectual drilling, efficiency is lower.

Disclosure of Invention

The invention aims to provide a stirring pile drill bit which can rapidly crush soil and improve drilling efficiency aiming at the defects of the prior art.

Stirring stake drill bit, it includes the spliced pole, the upper end of spliced pole is connected with two-layer blade, and the lower extreme of spliced pole is equipped with the drill bit body, the lower extreme of drill bit body is equipped with the drill point portion that the cross section is triangle-shaped, and the lower extreme that is located the blade of lower floor is connected with a plurality of brakes that are used for outwards stirring large granule solid-state object.

Furthermore, both sides of the upper end of the drilling tip part are respectively provided with a cutting part.

Further, the lower-layer blade is divided into a left lower blade and a right lower blade by the connecting column; the harrow nails connected with the left lower blade are left harrow nails, and the harrow nails connected with the right lower blade are right harrow nails; the distance between any left rake nail and the axis of the connecting column is different from the distance between any right rake nail and the axis of the connecting column.

Further, diamond compacts are connected to the braks and/or the drill tip.

Further, the rake nails are arranged obliquely.

Furthermore, the number of the braks is n, namely a first brank, a second brank and an … … nth brank from left to right; the inclination angle of each rake nail is a1, a2 and … … an respectively; the lengths of the harrow nails are respectively L1, L2 and … … Ln in sequence; the Ti = Li cos (ai) projected to the length direction of the blade on one side of the rake nail is 0< i < (n + 1); i is a natural number; the maximum distance between the rake nails and the axis of the connecting column is M; t1+ T2+ … … + Tn > = M, the faces covered by all the rake finger travel tracks are connected to form one annular groove when the connecting column is rotated one revolution.

Furthermore, the upper end of the harrow nail is provided with a connecting column which is hinged with the blades through the connecting column, the connecting column is sleeved with a torsional spring, and the torsional spring is respectively connected with the connecting column and the blades.

The invention has the beneficial effects that: the invention can effectively cut hard soil by arranging the drill bit structure with the drill tip part and the cutting part; and secondly, the lower ends of the blades are connected with raking nails, and the chopped hard soil and crushed stones are spread through the raking nails, so that the drilling efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

Fig. 2 is another schematic structural diagram of the present embodiment.

Fig. 3 is a schematic view of the blade cooperating with the rake nails and the connecting column.

The reference numerals include:

1-a bit body; 2-connecting column; 3-blade; 4-harrow pin; 5-diamond compact; 11-drilling tip; 12-cutting section.

Detailed Description

The present invention is described in detail below with reference to the attached drawings. As shown in fig. 1-3.

Example (b): referring to fig. 1, the mixing pile drill bit comprises a connecting column 2, two layers of blades 3 are connected to the upper end of the connecting column 2, a drill bit body 1 is arranged at the lower end of the connecting column 2, a drill tip 11 with a triangular cross section is arranged at the lower end of the drill bit body 1, and a plurality of brakes 4 used for stirring large-particle solid objects outwards are connected to the lower end of the blades 3 located on the lower layer.

When the stirring pile drives the pile downwards, the soil is crushed by downwards rotating the rotary head; the common drill bit generally adopts a conical drill bit body, so that the abrasion is large and the friction is large during cutting; the drilling effect is low; according to the technical scheme, the drill point part 11 of the drill body 1 is triangular, so that the drill point part is provided with a cutter edge, the cutter edge is firstly contacted with soil in the rotating process, and the contact pressure is higher and the cutting force is higher under the contact area of the cutter edge; the hard soil is conveniently cut up; when larger particles are encountered, such as sand; large particles generally refer to particles having a maximum outer diameter of 60mm or more; the particles are chopped by the drill tip 11; larger particles may remain, which, if the blades 3 are touched, still cause a larger resistance to the bit body 1; when the blade 3 is prevented from touching, a better scheme does not exist at present for the person skilled in the art, and at the moment, the person skilled in the art generally adopts other piling modes; the lower end face of the lower layer of the blade 3 is connected with the brakes 4, when the drill body 1 drills downwards under pressure, the blade 3 moves downwards along with the connecting column 2, the brakes 4 of the lower layer of the blade 3 are firstly contacted with the chopped larger particles, and the brakes 4 drive the large particles to rotate and push outwards under the action of centrifugal force or move outwards under the thrust of the side faces of the brakes 4.

Further, cutting portions 12 are respectively formed at both sides of the upper end of the drill tip portion 11.

In specific implementation, the upper end of the drill tip part 11 may be rectangular, and the cutting part 12 is integrally formed with the drill tip part 11; the drilling tip 11 is triangular block-shaped, and the cutting part 12 is rectangular block-shaped. In actual operation, when the drill tip 11 drills into a soil layer with high hardness, the gravel in the soil is not all horizontal, and during drilling, the side surface of the drill tip 11 is firstly contacted with the gravel, the side end part of the drill tip 11 has a small contact area and a large acting force distance, so that the moment and the pressure born by the contact area are large, and the fracture is easily caused; for a long time, the skilled person will generally set the outer diameter of the drill tip 11 to be the same as the connecting stud 2; in this way, when the outer diameter of the drill tip 11 is increased, the outer diameter of the connecting column 2 needs to be increased, and other places are inevitably changed, so that the cost is high. The technical scheme adopts the extended cutting parts 12 distributed towards two sides to increase the working outer diameter of the drilling tip part 11; and simultaneously, the corresponding structural strength is also ensured. In this embodiment, the bit body 1 is a rectangular block with a triangular tip.

Referring to fig. 1 and 3, further, the lower blade 3 is divided into a left lower blade 3 and a right lower blade 3 by a connecting column 2; the harrow nails 4 connected with the left lower blade 3 are left harrow nails 4, and the harrow nails 4 connected with the right lower blade 3 are right harrow nails 4; the distance between any left rake nail 4 and the axis of the connecting column 2 is different from the distance between any right rake nail 4 and the axis of the connecting column 2.

In order to facilitate the pulling of the broken soil or the broken stones, the distance from the left rake nail 4 to the axis is different from the distance from the right rake nail 4 to the axis at the position where the rake nail 4 is arranged, so that the left rake nail 4 and the right rake nail 4 are complementary to each other to form a plurality of distance differences in the rotation process of the connecting column 2; stirring the crushed soil or the crushed stone with various distances from the axis. The structure of the harrow pin 4 can be a rectangular block, an arc-shaped piece and the like. When the device is specifically arranged, the left rake nail 4 and the right rake nail 4 can be respectively arranged by 2.

Referring to fig. 2, further, the brad 4 and/or the drill tip 11 is connected with a diamond compact 5.

The diamond compact 5 is added, so that the drill bit body 1 can be prevented from being worn too fast and is easy to drill.

Further, the rake nails 4 are obliquely arranged.

When the rake nails 4 are arranged, the length direction of the rake nails and the length direction of the blades 3 form an included angle, and the included angle is 0 to 90 degrees, preferably: within 45 to 90 degrees. When the harrow teeth 4 are arranged in this way, when the harrow teeth 4 are contacted with large-particle crushed soil or crushed stone along with the rotation of the blades 3, most of the harrow teeth are contacted with the side surface, the contact area is large, and the crushed soil or crushed stone is prevented from being clamped between two adjacent harrow teeth 4.

Referring to fig. 3, further, there are n rake nails 4, which are the first, the second and the … … nth from left to right; the inclination angle of each rake nail 4 is a1, a2, … … an; the lengths of the harrow nails 4 are respectively L1, L2 and … … Ln in sequence; ti = Li cos (ai), 0< i < (n +1) projected to the length direction of the blade 3 on the rake nail 4 side; i is a natural number; the maximum distance between the rake nails 4 and the axis of the connecting column 2 is M; t1+ T2+ … … + Tn > = M, and when the connecting column 2 rotates once, the faces covered by the moving tracks of all the raker nails 4 are connected to form an annular groove.

When the harrow nails 4 are obliquely arranged, the particles move outwards along the harrow nails 4; the radial distance of the poking of one rake nail 4 is limited, and the technical scheme adopts a relay mode to gradually push the particles outwards from the inside under the condition that the rake nails 4 on the inner side are pushed one by one; the method specifically comprises the following steps: because all the surfaces covered by the moving tracks of the harrow nails 4 are connected to form a complete annular groove, no hard soil and gravels exist inside the harrow nails 4.

Furthermore, the upper end of the harrow nail 4 is provided with a connecting column 2 and is hinged with the blades 3 through the connecting column 2, the connecting column 2 is sleeved with a torsion spring, and the torsion spring is respectively connected with the connecting column 2 and the blades 3.

In the working process, when the harrow nails 4 are used for shifting the crushed soil or the crushed stone outwards, hard soil or crushed stone is likely to be clamped between the two harrow nails 4, and the possibility is very low if the harrow nails 4 are shifted outwards by depending on the side surfaces of the harrow nails 4; according to the technical scheme, the upper end of the harrow pin 4 is connected with a connecting column 2, the connecting column 2 is equivalent to a connecting shaft, and a torsion spring is used for controlling the rotating angle of the harrow pin 4 relative to the blade 3; when the hard soil is clamped, the hard soil rotates along with the connecting column 2, the hard soil needs centripetal force to maintain rotation, the centripetal force needs to be provided by the outer-side brads 4, meanwhile, the centripetal force also acts on the outer-side brads 4, the outer-side brads 4 drive the torsion springs to rotate, the centripetal force is insufficient, the distance between the brads 4 on the two sides of the hard soil is increased due to the rotation of the torsion springs, the hard soil is thrown out by the centrifugal force, and the purpose of pulling the hard soil is achieved.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.