CN213898856U - Integrated reverse circulation drill bit - Google Patents

Abstract

The embodiment of the utility model provides an integrated form reverse circulation drill bit, its characterized in that: the device comprises a cylindrical drilling barrel, plate teeth embedded in the barrel wall at the bottom of the drilling barrel, a cylindrical slurry suction pipe which is positioned in the drilling barrel and is coaxial with the drilling barrel, and a ribbed plate fixedly connected between the inner wall of the drilling barrel and the outer wall of the slurry suction pipe; the plate tooth comprises two rectangular connecting plates and a plate tooth cutter head positioned below the connecting plates, a groove is formed in the intersection of the front end surface and the bottom surface of the plate tooth cutter head, and a cutting edge is arranged in the groove. The utility model integrates the plate tooth and the cutting tooth into a whole and optimizes the structure, thereby greatly improving the construction efficiency; the large-diameter slurry suction pipe ensures smooth dredging and mud discharging during reverse circulation construction operation, and avoids drill jamming and drill blocking; meanwhile, the drilling barrel ensures the verticality during drilling operation.

Description

Integrated reverse circulation drill bit

Technical Field

The utility model relates to a campshed construction technical field, concretely relates to integrated form reverse circulation drill bit.

Background

The soft engagement type row pile adopts super-retarding concrete when constructing the I-sequence pile, the initial setting time is as long as 20 hours, and the soft engagement type row pile is generally applied on the ground, so that the soft engagement type row pile is suitable for operation places with abundant operation space, convenient construction such as a drilling machine shifting and reversing sequence and casing installation. However, the underground excavated station of the subway has a limited space, if plain pile concrete is solidified, the reinforced concrete pile cannot be constructed, and the casing pipe laying needs to be matched with a pipe rolling machine and needs a certain operation space, so that the construction process is complicated, and the accident rate and the construction cost are increased. The reverse circulation process is that when the drilling machine works, the rotary disc drives the drill bit at the end of the drill rod to cut and crush rock and soil in the hole, flushing liquid flows into the bottom of the hole from an annular gap between the drill rod and the hole wall, the drill bit is cooled and carries the cut rock and soil drilling slag, the flushing liquid returns to the ground from the inner cavity of the drill rod, and meanwhile, the flushing liquid returns to the hole to form circulation. Because the inner cavity of the drill rod is much smaller than the diameter of the well hole, the mud water in the drill rod rises much faster than the positive circulation. The clear water and the drilling slag can be brought to the top end of the drill rod and flow to the mud sedimentation tank, and the mud is recycled after being purified. Compared with the positive circulation, the reverse circulation has the advantages of much higher drilling speed, less mud amount, small power consumed by the rotary table, quicker hole cleaning time, capability of drilling and excavating rocks by adopting a special drill bit and the like.

Due to the fact that the site of a subway engineering construction site is limited, when occlusion type row piles are adopted for water stopping, limited space operation exists, holes are formed as soon as possible when the bored pile is required to be constructed, and hole collapse caused by long-time stratum disturbance is avoided. Therefore, according to the principle of forming the holes of the cast-in-situ bored piles as soon as possible, the full-casing full-slewing drilling machine with high obstacle clearing capability is matched with a reverse circulation process for construction, and the meshed row piles are subjected to hard cutting hole forming construction.

In implementing the present invention, the applicant has found that there are at least the following problems in the prior art: the ribbed plate for fixing the bit is similar to a cantilever structure to extend the bit downwards, the overall rigidity is poor, and when the drill bit works, a small number of bit positioned in the center part firstly drills, the overall stress of the bit is unbalanced, so that the perpendicularity of the bit in the working process is difficult to ensure under the action of large resistance and impact force, and the construction quality is influenced. Therefore, it is a problem to be solved to design a novel reverse circulation drill bit capable of ensuring the verticality in the drilling operation.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a reverse circulation drill bit of main cutter head along circumference equipartition and integrated multiple cutting tool bit to solve among the prior art operation straightness poor problem that hangs down.

To achieve the above object, an embodiment of the present invention provides an integrated reverse circulation drill bit, which is characterized in that:

an integrated reverse circulation drill bit, comprising: the device comprises a cylindrical drilling barrel, plate teeth fixed on the barrel wall at the bottom of the drilling barrel in a bolt connection mode, a cylindrical slurry suction pipe which is positioned in the drilling barrel and is coaxial with the drilling barrel, and a ribbed plate fixedly connected between the inner wall of the drilling barrel and the outer wall of the slurry suction pipe;

the plate tooth is composed of two rectangular connecting plates and a plate tooth cutter head positioned below the connecting plates; the two connecting plates have the same appearance size and are respectively arranged on the inner side and the outer side of the barrel wall of the drilling barrel in parallel, and through holes are formed in the connecting plates; the plate tooth cutter head is a closed entity consisting of an inner side face, an outer side face, a top face, a bottom face, a front end face, a rear end face and an inclined face, wherein the top face and the bottom face are respectively parallel to a horizontal plane, the front end face and the rear end face are respectively vertical to the horizontal plane, the height of the front end face is greater than that of the rear end face, the inclined face is respectively connected with the rear end face and the bottom face, the outer side face is respectively vertical to the bottom face and the front end face, and the outer side face is parallel to the inner side face; a groove is arranged at the intersection of the front end surface and the bottom surface, and an included angle is formed between the depth direction of the groove and the horizontal plane;

a cutting edge is arranged in the groove.

Preferably, the plate teeth comprise inward-inclined plate teeth, straight plate teeth and outward-inclined plate teeth;

in a vertical section perpendicular to the connecting plate, an included angle alpha is formed between the connecting plate and the top surface;

the included angle alpha of the straight plate teeth is 90 degrees;

the included angle alpha of the inward-inclined plate teeth is less than 90 degrees;

the included angle alpha of the camber plate tooth is larger than 90 degrees.

The outward-inclined plate teeth, the straight plate teeth and the inward-inclined plate teeth are all multiple, and the outward-inclined plate teeth, the straight plate teeth and the inward-inclined plate teeth are distributed alternately along the circumferential direction of the drilling barrel.

Preferably, a plurality of wear-resistant blocks are further embedded on the barrel wall at the bottom of the barrel, and are circumferentially and uniformly distributed by taking the axis of the drilling barrel as the center;

the wear-resistant block is a vertical strip-shaped solid body enclosed by an inner circular arc surface, an outer circular arc surface, an upper plane, a lower plane, a left side surface and a right side surface; the inner side arc surface is positioned on the outer wall of the drilling barrel, and the outer side arc surface is coaxial with the inner side arc surface; the left side surface and the right side surface are parallel to each other and perpendicular to the horizontal plane.

Preferably, the bottom plane of the plate tooth is lower than the bottom plane of the drill barrel;

the bottom plane of the wear-resistant block is equal to the bottom plane of the drilling barrel in height.

Preferably, the rib plate is vertical to the horizontal plane;

the number of the rib plates is three, and the rib plates are uniformly distributed in the circumferential direction by taking the axis of the drilling barrel as the center;

a strip-shaped tool apron is fixed at the bottom of each rib plate;

the top of the ribbed plate is not higher than the top of the drill barrel.

Preferably, the bottom of each tool apron is provided with one or more cutting teeth, the rear ends of the cutting teeth are cylinders, the front ends of the cutting teeth are cones, the cylinders at the rear ends of the cutting teeth are fixed on the tool apron, and the axes of the cutting teeth are located in the plane of the rib plates and are perpendicular to the length direction of each tool apron.

Preferably, the tips of any two of the picks are at unequal horizontal distances from the axis of the drill barrel.

Preferably, the bottom opening of the cylindrical slurry suction pipe is provided with three arc-shaped grooves;

the three arc grooves are circumferentially and uniformly distributed by taking the axis of the drilling barrel as the center.

Preferably, the included angle of the inward inclined plate teeth is 85 degrees;

the included angle of the outward-inclined plate teeth is 95 degrees.

The technical scheme has the following beneficial effects:

the utility model discloses an integrated form reverse circulation drill bit passes through optimal design, the plate tooth equipartition that will carry out cutting operation earlier is on an integral brill bucket, because the tubular structure possesses better bending resistance, anti-shear property under equal weight condition, therefore its intensity is higher, stability is better, and simultaneously, owing to distribute in all plate teeth simultaneous workings on the circumference, therefore the atress is more even, the deformation of having avoided conventional drill bit to appear easily, the incline that vibration etc. lead to, therefore hang down straightness when effectively having guaranteed the operation of creeping into.

Except the verticality that can guarantee the operation in-process, the following technical problem that prior art exists has still been solved to the technical scheme of this application:

the drill bit adopted in the traditional reverse circulation process construction has low drilling speed and low working efficiency; when the slurry suction pipe is used for operation, the slurry suction pipe needs to be additionally arranged, and the slurry suction pipe is easily blocked by sludge, so that the problems of drill blocking, drill blocking and the like are caused. In the technical scheme of the application, the plate teeth are distributed in a circumferential manner, so that the number of the cutter heads capable of simultaneously operating is obviously increased, and the cutting edges of the plate teeth are in line contact with the soil layer, so that compared with a traditional point contact type of the conical pointed-top cutter head, the cutting area is larger, the speed is higher, and the construction efficiency is improved; meanwhile, the large-caliber slurry suction pipe is integrated on the drill bit, so that smooth dredging and sludge discharge during reverse circulation construction operation are ensured, and the problems of drill sticking, drill blocking and the like are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of an integrated reverse circulation drill bit according to an embodiment of the present invention;

fig. 2 is a front view of an integrated reverse circulation drill bit in accordance with an embodiment of the present invention;

fig. 3 is a top view of an integrated reverse circulation drill bit in accordance with an embodiment of the present invention;

fig. 4 is a perspective view of an integrated reverse circulation drill bit according to an embodiment of the present invention, shown in fig. 1;

fig. 5 is a perspective view 2 of an integrated reverse circulation drill according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a plate tooth of an integrated reverse circulation drill according to an embodiment of the present invention;

FIG. 7 is a schematic view of another direction of plate teeth of an integrated reverse circulation drill bit according to an embodiment of the present invention;

reference numerals: 1. a pulp suction pipe; 2. a rib plate; 3. a tool apron; 4. drilling a barrel; 5. a cutting pick; 6. plate teeth; 7. a wear-resistant block; 8. an inward-inclined plate tooth; 9. straight plate teeth; 10. a camber plate tooth; 21. a top surface; 22. a bottom surface; 23. a front end face; 24. a rear end face; 25. an inner side surface; 26. an outer side surface; 27. a bevel; 28. a groove; 29. a through hole; 30. a cutting edge.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, 2, 6 and 7, an embodiment of the present invention provides an integrated reverse circulation drill bit, which is characterized in that the integrated reverse circulation drill bit comprises a cylindrical drilling barrel 4, plate teeth 6 fixed on the barrel wall at the bottom of the drilling barrel 4 in a bolt connection manner, a cylindrical slurry suction pipe 1 located inside the drilling barrel 4 and coaxial with the drilling barrel 4, and a rib plate 2 fixedly connected between the inner wall of the drilling barrel 4 and the outer wall of the slurry suction pipe 1;

the plate tooth 6 consists of two rectangular connecting plates and a plate tooth cutter head positioned below the connecting plates; the two connecting plates have the same overall dimension and are respectively arranged on the inner side and the outer side of the barrel wall of the drilling barrel 4 in parallel, and through holes 29 are arranged on the connecting plates; the plate tooth cutter head is a closed entity consisting of an inner side surface 25, an outer side surface 26, a top surface 21, a bottom surface 22, a front end surface 23, a rear end surface 24 and an inclined surface 27, wherein the top surface 21 and the bottom surface 22 are respectively parallel to a horizontal plane, the front end surface 23 and the rear end surface 24 are respectively vertical to the horizontal plane, the height of the front end surface 23 is greater than that of the rear end surface 24, the inclined surface 27 is respectively connected with the rear end surface 24 and the bottom surface 22, the outer side surface 26 is respectively vertical to the bottom surface 22 and the front end surface 23, and the outer side surface 26 is parallel to the inner side surface 25; a groove 28 is formed at the intersection of the front end surface 23 and the bottom surface 22, and an included angle is formed between the depth direction of the groove 28 and the horizontal plane;

a cutting edge 30 is disposed within the recess 28.

The cutting tool bits of the traditional reverse circulation drill bit are in the shape of bullet heads of cutting picks in the application, the cutting tool bits are distributed on the ribbed plates in the middle of the drill bit, the ribbed plates extend out of the bottom of the tool bit base body, the ribbed plates are arranged in an inclined mode, the position of the ribbed plates is lower the closer to the center of the drill bit, and therefore the bottom of the traditional reverse circulation drill bit is similar to a cone in side view. When the drilling machine works, the most central cutting tool bit firstly cuts, and then the tool bits on the two sides are gradually added into the drilling operation along with the fact that the drill bit penetrates into the soil layer. Because only a few tool bits positioned at the bottommost part participate in the work firstly, the speed of cutting the soil layer is not very high; meanwhile, as each rib plate protrudes outwards to form a structure similar to a cantilever, under the condition of larger resistance and impact force when the drill bit works, vibration and larger deformation are inevitably generated, so that the verticality of the whole drill bit during the work is influenced, and the construction quality is influenced; moreover, the slurry suction pipe needs to be additionally arranged during operation, and the slurry suction pipe is easily blocked by sludge, so that the problems of drill blocking, drill blocking and the like are caused.

In the technical scheme, a hollow drill barrel without a top cover and a lower bottom is selected as a main part for arranging the cutter head, and the bottom of the drill barrel 4 is flush with the horizontal plane, namely the axis of the drill barrel is vertical to the horizontal plane, so that the drill can vertically drill during operation. The cutter heads (namely the plate teeth) which are positioned at the lower part and perform drilling operation firstly are uniformly distributed on the side wall of the bottom of the cylinder. Because the drum structure has higher intensity and stability to very easily will place the tool bit equipartition above that, consequently, receive under the condition of great resistance and impact force at the during operation immediately, the drum still has fine stability, for the drill bit of traditional structure, its vibration is little, the part shape diminishes, has effectively guaranteed the straightness that hangs down when creeping into the operation. When the drill bit works, the plate-shaped teeth firstly contact with the soil layer to cut the soil layer in a circular range. Meanwhile, in order to facilitate arrangement and improve the working efficiency, the technical scheme adopts the plate teeth as the main cutting tool bit, the cutting area of the plate teeth contacting the soil layer is large, and the efficiency of the drill bit cutting the soil layer at the same rotating speed is higher. According to the shape of the connecting plate on the plate tooth and the distance between the two connecting plates, the connecting groove is formed in the side wall of the drilling barrel, so that the connecting plate of the plate tooth can be matched with the connecting groove, and then the connecting plate is fixed on the drilled-through side wall through the bolt, and the plate tooth is fixed. The movable connection mode enables the plate tooth to be more conveniently replaced.

The cutting edge of the plate tooth is made of high-wear-resistant materials and is fixed in the groove of the plate tooth cutter head in a welding mode, the thickness of the cutting edge is about 5mm, and the height of the cutting edge is slightly higher than the depth of the groove, so that the cutting edge protrudes out of the bottom surface of the plate tooth cutter head to play a role in work.

Three vertical ribbed plates are arranged in the cylinder, and the ribbed plates can be used for reinforcing the drill barrel and can also be used for arranging a common cutter head, namely a cutting pick, in the cylinder. The slurry suction pipe is connected with the inner side of the rib plate and is also of a hollow cylindrical structure, is concentric with the drill barrel and protrudes out of the top of the drill barrel, can be used for replacing a pipeline which needs to be additionally configured in the traditional operation mode, and can be connected to a drill rod of a rotary drilling machine through a boss arranged on the outer side of the top end of the pipeline to serve as a power input shaft for driving a drill bit to rotate.

Preferably, as shown in fig. 4, 5 and 7, the plate teeth 6 comprise inward-inclined plate teeth 8, straight plate teeth 9 and outward-inclined plate teeth 10;

in a vertical section perpendicular to the connecting plate, an included angle α is formed between the connecting plate and the top surface 21;

the included angle alpha of the straight plate teeth 9 is 90 degrees;

the included angle alpha of the inward-inclined plate teeth 8 is less than 90 degrees;

the included angle alpha of the camber plate tooth 10 is larger than 90 degrees.

The outward-inclined plate teeth 8, the straight plate teeth 9 and the inward-inclined plate teeth 10 are all multiple, and the outward-inclined plate teeth 8, the straight plate teeth 9 and the inward-inclined plate teeth 10 are distributed along the circumferential direction of the drilling barrel 4 in an alternating mode.

The inner side and the outer side of the straight plate tooth are the same as the wall of the drilling barrel and are vertical; and the cutter head after the assembly of the outward-inclined plate teeth is more deviated to the outer side of the drilling barrel, and the cutter head after the assembly of the inward-inclined plate teeth is more deviated to the inner side of the drilling barrel.

In order to improve the efficiency, as shown in fig. 4 and 5, the plate teeth are alternately arranged according to three angles of outward inclination, vertical inclination and inward inclination, so that three cutter heads can cut synchronously at multiple angles. The straight plate teeth are overlapped with the vertical plane of the wall of the drill barrel, so that the roundness of the section of the drill hole is ensured; the camber plate teeth may be used to cut adjacent I-sequence piles, etc.

Preferably, as shown in fig. 2, a plurality of wear-resistant blocks 7 are further embedded on the barrel wall at the bottom of the cylinder, and the wear-resistant blocks 7 are circumferentially and uniformly distributed by taking the axis of the drilling barrel 4 as a center;

the wear-resistant block 7 is a vertical strip-shaped closed entity enclosed by an inner circular arc surface, an outer circular arc surface, an upper plane, a lower plane, a left side surface and a right side surface; the inner side arc surface is positioned on the outer wall of the drilling barrel 4, and the outer side arc surface is coaxial with the inner side arc surface; the left side surface and the right side surface are parallel to each other and perpendicular to the horizontal plane.

The inner side and the outer side of the wear-resistant block are attached to the side wall of the drill barrel, and the outer side of the wear-resistant block is vertical. The wear-resisting piece is used for protecting the extroversion plate tooth, what bore the bucket the outside and contact with soil is wear-resisting piece, and the extroversion plate tooth bores downwards after cutting the soil layer, and the soil body still can rub extrusion plate tooth drill bit, and the friction and the extrusion of this part of soil body to the extroversion plate tooth have been born to a certain extent to wear-resisting piece, consequently sets up wear-resisting piece and can reduce the number of times of trading the tooth, guarantees to creep into the efficiency of construction.

Preferably, as shown in fig. 2, the bottom plane of the plate tooth 6 is lower than the bottom plane of the drill barrel;

the bottom plane of the wear-resistant block 7 is equal to the bottom plane of the drilling barrel 4 in height.

Preferably, as shown in fig. 3 and 4, the rib plates 2 are vertical to the horizontal plane;

the number of the rib plates 2 is three, and the rib plates are uniformly distributed in the circumferential direction by taking the axis of the drilling barrel 4 as the center;

a strip-shaped tool apron 3 is fixed at the bottom of each rib plate 2;

the top of the rib plate 2 is not higher than the top of the drill barrel 4.

Because the ribbed plates are uniformly distributed along the axial direction of the drill barrel, the tool holders also form an angle of 120 degrees with each other. In order to allow the stops fixed on the tool apron to enter into the cutting operation in sequence, the tool apron forms an inclination angle of 30 degrees with the horizontal plane. The intersection of the tool apron is positioned on the axis of the drill barrel, and the intersection is provided with a precedent tool for cutting soil mass in advance.

Preferably, as shown in fig. 5, one or more cutting picks 5 are arranged at the bottom of each tool apron, the rear end of each cutting pick 5 is a cylinder, the front end of each cutting pick 5 is a cone, the cylinder part of the rear end of each cutting pick 5 is fixed on the tool apron 3, and the axis of each cutting pick 5 is located in the plane of the rib plate and is perpendicular to the length direction of each tool apron 3.

In order to ensure that the pattern layer drilled through the interior is also quickly broken and drilled, the technical scheme reserves the tool bit form in the traditional drill bit, namely the cutting pick in the scheme, so that the cutting pick can be used as an auxiliary tool bit to play a role after the plate teeth positioned on the circumference carry out drilling work.

Preferably, as shown in fig. 1, the tips of any two of the picks 5 are at unequal horizontal distances from the axis of the drill barrel 4.

The cutting pick is arranged on 3 banner type tool holders in the drilling barrel and is arranged in a 3, 3 and 4 (cutting tools) mode, so that the phenomenon that wheel traces formed by each cutting tool are not overlapped is guaranteed, and the cutting pick mainly plays a role in plowing loose and breaking large soil. In order to ensure that the plate teeth at the bottom of the drill barrel are used for cutting firstly during working, then the internal cutting teeth are used for following and crushing the soil layer in the circular section cut off by the plate teeth, and the bottom positions of the tool holders are all higher than the bottom of the drill barrel.

Preferably, as shown in fig. 1 and 5, the bottom of the cylindrical slurry suction pipe 1 is provided with three arc-shaped grooves 50;

the three arc-shaped bevels 50 are circumferentially and evenly distributed with the axis of the drilling barrel 4 as the center.

On the lateral wall of inhaling thick liquid bottom of the pipe, the hole is seted up to the slant, makes the upside of lateral wall trompil form the arc groove, and the downside of trompil links to each other with the bottom outlet of inhaling thick liquid pipe for increase the flow area of during operation, can make things convenient for the during operation desilting to go out mud like this, reduces the card and bores, stifled brill probability, and simultaneously, the thick liquid pipe of inhaling passes through reinforced floor and bores bucket inner wall connection, has increased drill bit rigidity in entirety, has increased drill bit

Preferably, as shown in fig. 7, the included angle α of the inward-inclined plate tooth 8 is 85 °;

the included angle alpha of the camber plate tooth 10 is 95 degrees.

Namely, the inward and outward inclined plate teeth and the vertical direction form a deflection angle of 5 degrees.

When all the plate teeth are straight plate teeth, the range of cutting soil is smaller; if the inward-inclined plate teeth and the outward-inclined plate teeth are added, the soil is cut in three circular areas, and the soil layer is easier to cut than the soil layer cut in one circular area, so that the drilling efficiency is improved. But the large angle of inclination will have some effect on the overall stability. Experiments prove that the inclination angle of 5 degrees can enable the drill bit to obtain better cutting speed.

In this embodiment, preferably, the plate tooth as the main cutting blade is made of tungsten-cobalt alloy, and the cutting tooth is made of chromium-molybdenum alloy such as 42 Crmo.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. An integrated reverse circulation drill bit, comprising: the device comprises a cylindrical drilling barrel (4), plate teeth (6) fixed on the barrel wall at the bottom of the drilling barrel (4) in a bolt connection mode, a cylindrical slurry suction pipe (1) which is positioned in the drilling barrel (4) and is coaxial with the drilling barrel (4), and a rib plate (2) fixedly connected between the inner wall of the drilling barrel (4) and the outer wall of the slurry suction pipe (1);

the plate tooth (6) consists of two rectangular connecting plates and a plate tooth cutter head positioned below the connecting plates; the two connecting plates have the same appearance size and are respectively arranged on the inner side and the outer side of the barrel wall of the drilling barrel (4) in parallel, and through holes (29) are formed in the connecting plates; the plate tooth cutter head is a closed entity consisting of an inner side surface (25), an outer side surface (26), a top surface (21), a bottom surface (22), a front end surface (23), a rear end surface (24) and an inclined surface (27), wherein the top surface (21) and the bottom surface (22) are respectively parallel to a horizontal plane, the front end surface (23) and the rear end surface (24) are respectively vertical to the horizontal plane, the height of the front end surface (23) is greater than that of the rear end surface (24), the inclined surface (27) is respectively connected with the rear end surface (24) and the bottom surface (22), the outer side surface (26) is respectively vertical to the bottom surface (22) and the front end surface (23), and the outer side surface (26) is parallel to the inner side surface (25); a groove (28) is formed in the intersection of the front end face (23) and the bottom face (22), and an included angle is formed between the depth direction of the groove (28) and the horizontal plane;

a cutting edge (30) is arranged in the groove (28).

2. The integrated reverse circulation drill bit according to claim 1, wherein: the plate teeth (6) comprise inward-inclined plate teeth (8), straight plate teeth (9) and outward-inclined plate teeth (10);

in a vertical section perpendicular to the connecting plate, an included angle alpha is formed between the connecting plate and the top surface (21);

the included angle alpha of the straight plate teeth (9) is 90 degrees;

the included angle alpha of the inward inclined plate teeth (8) is less than 90 degrees;

the included angle alpha of the camber plate tooth (10) is more than 90 degrees;

the inner inclined plate teeth (8), the straight plate teeth (9) and the outer inclined plate teeth (10) are all multiple, and the inner inclined plate teeth (8), the straight plate teeth (9) and the outer inclined plate teeth (10) are distributed along the circumferential direction of the drilling barrel (4) in an alternating mode.

3. The integrated reverse circulation drill bit according to claim 2, wherein:

a plurality of wear-resistant blocks (7) are further embedded in the barrel wall at the bottom of the cylinder, and the wear-resistant blocks (7) are uniformly distributed in the circumferential direction by taking the axis of the drilling barrel (4) as the center;

the wear-resistant block (7) is a vertical strip-shaped closed entity enclosed by an inner circular arc surface, an outer circular arc surface, an upper plane, a lower plane, a left side surface and a right side surface; the inner side arc surface is positioned on the outer wall of the drilling barrel (4), and the outer side arc surface is coaxial with the inner side arc surface; the left side surface and the right side surface are parallel to each other and perpendicular to the horizontal plane.

4. The integrated reverse circulation drill bit according to claim 3, wherein:

the bottom plane of the plate tooth (6) is lower than that of the drilling barrel;

the bottom plane of the wear-resistant block (7) is equal to the bottom plane of the drilling barrel (4) in height.

5. The integrated reverse circulation drill bit according to claim 1, wherein:

the ribbed slab (2) is vertical to the horizontal plane;

the number of the rib plates (2) is three, and the rib plates are uniformly distributed in the circumferential direction by taking the axis of the drilling barrel (4) as the center;

a strip-shaped tool apron (3) is fixed at the bottom of each rib plate (2);

the top of the ribbed plate (2) is not higher than the top of the drilling barrel (4).

6. The integrated reverse circulation drill bit according to claim 5, wherein:

one or more cutting picks (5) are arranged at the bottom of each tool apron, the rear ends of the cutting picks (5) are cylinders, the front ends of the cutting picks are cones, the cylinder parts of the rear ends of the cutting picks (5) are fixed on the tool apron (3), and the axes of the cutting picks (5) are located in the plane where the rib plates are located and are perpendicular to the length direction of the tool apron (3).

7. The integrated reverse circulation drill bit according to claim 6, wherein:

the horizontal distances from the tooth tips of any two cutting picks (5) to the axis of the drill barrel (4) are unequal.

8. The integrated reverse circulation drill bit according to claim 1, wherein:

the bottom of the cylindrical slurry suction pipe (1) is provided with three arc grooves (50);

the three arc grooves (50) are circumferentially and uniformly distributed by taking the axis of the drilling barrel (4) as the center.

9. The integrated reverse circulation drill bit according to claim 2, wherein:

the included angle alpha of the inward inclined plate teeth (8) is 85 degrees;

the included angle alpha of the outward inclined plate teeth (10) is 95 degrees.

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