CN217400823U - Wedge type diamond coring bit - Google Patents

Abstract

The new model relates to a wedge-shaped diamond coring drill bit, which comprises a cutter bar and a blade, wherein the cutter bar is of a hollow cylindrical cavity structure with several blades, which are connected with the front end surface of the cutter bar around the axis of the cutter bar, and the blade includes a front peak and a back The front peak is a wedge-shaped body structure, including blade edge I, blade edge II, blade face I, blade face II, blade face III, and blade face IV. The new type can effectively reduce the resistance and impact force between the blade edge surface and the rock, and improve the cutting force of the blade to the rock, thereby greatly improving the cutting force and cracking effect of the diamond coring blade on the rock when it rotates to drill the core. The downward component force of the blade is increased, and the stability between the blade and the shank is increased.

Description

A wedge-shaped diamond core drill

technical field

The new model relates to a wedge-shaped diamond coring drill bit, which belongs to the technical field of medical geological exploration equipment and drill bits.

Background technique

When it is necessary to analyze geological rock formations in mining and building construction, a core drill bit with a diamond blade is often installed at the front end of the drill pipe casing for drilling. The core drilling bit plays a major role in the integrity and high drilling efficiency of core drilling. The blade structure set by the core drilling bit is the key to improving the integrity and high drilling efficiency of core drilling. No matter how large the rotary power of the drill bit is, without a reasonable mechanical structure design of the drill bit blade, it will not help, and will only cause a lot of energy waste. As for the current coring diamond bits, there are mainly one-shaped, triangular, cross-shaped or X-shaped, etc. These structures have a common feature that the thickness of the blade on the left and right sides of the blade is the same, the cutting force and cracking of the rock are small, and the resistance is large. When the drill bit rotates, it mainly relies on the strong impact force of the blade edge to split the rock, so as to complete the core drilling. This strong impact splitting force can easily cause the core to be broken, and most of the cores drilled are broken blocks, which is not conducive to Rock composition analysis and mechanical performance test, in addition, the blade edge is vertical, and there is no good mechanical sharing effect when it is in contact with the rock, and the force is all borne by the bottom of the blade, which can easily cause the blade and the drill to fall off, thus seriously affecting the core coring work. Efficiency, quality and stability of use of coring bits.

Therefore, in view of this problem, it is urgent to develop a new structure of diamond coring bit to meet the needs of practical use.

Utility model content

In order to solve the deficiencies in the prior art, the present invention provides a wedge-shaped diamond coring drill bit, which is designed through an integrated structure that divides the drill blade into a front peak and a back peak, and the front peak is consistent with the rotation direction of the drill bit. The cutting edge is designed to have a thin-to-thick structure of 45° in the horizontal direction, and a gradient structure of 65° and 45° in the vertical direction, which greatly improves the impact of the diamond coring blade on the rock when rotating the core. The cutting force and cracking effect, and at the same time, compared with the flat-shaped blade, the downward component force of the blade is increased, and the stability between the blade and the drill bit is increased, so that it is easier to ensure the integrity of core drilling and drilling efficiency, and Blade stability.

In order to achieve the above object, the present invention is realized through the following technical solutions:

A wedge-shaped diamond coring drill bit, comprising a shank and a blade, wherein the shank is a hollow cylindrical cavity structure, a plurality of blades are connected with the front end surface of the shank around the axis of the shank, and the blade includes a front peak and a back peak, wherein The back peak is located on the rear side of the forward and is connected to the rear side of the forward, and the cutting direction of the forward is consistent with the rotation direction of the cutter bar, and the cutting direction of the back peak is opposite to the rotation direction of the cutter bar. At least 0.5 mm lower, the front peak is a wedge-shaped body structure, including cutting edge I, cutting edge II, cutting edge face I, cutting edge face II, cutting edge face III, cutting edge face IV, the cutting edge II and cutting edge I are integrated In addition, the knife edge I is located below the knife edge II, the knife edge I and the horizontal plane are at an angle of 50°-70°, the knife edge II is at a 30°-50° angle with the horizontal plane, and the inner side of the front peak corresponding to the knife edge I is set. Blade face I, blade face II is set on the outer side, blade face III is set on the inner side of the front peak corresponding to blade edge II, blade face IV is set on the outer side, blade face I and blade face II intersect and form an included angle of 30°-50°. The blade face III and the blade face IV intersect and form an included angle of 30°-50°, and the blade face I, the blade face II, the blade face III, and the blade face IV are all arc surface structures.

Further, the front peak and the back peak of the blade are in an integrated structure, and each blade and the front end face of the blade are connected by at least one of a chute, a pin, and a bolt structure, and the blade and the front end face of the blade are connected by at least one. Can be connected by welding.

Further, the distance between the blades connected by the front end face of the cutter bar is 0-10 mm, and the total length of each blade is not less than 80% of the circumference of the front end face of the cutter bar.

Further, the outer side of the connecting surface of the front peak and the back peak of the blade is flush with the outer side of the cutter bar, and the curved surfaces of the cutting edge surface II and the cutting edge surface IV are consistent with the drill rod, and the cutting edge I, the cutting edge II are consistent with the drill rod. The rotation direction of the tool holder is kept on the same arc line.

Further, the back peak is a quadrangular pyramid structure in which the axial interface is any one of an isosceles shape and a right-angled trapezoid, and its inner side and outer side are distributed coaxially with the blade face III and the blade face IV. surface structure.

Further, the upper end surfaces of the front peak and the back peak are distributed parallel to the front end surface of the cutter bar, and the height of the front edge is not less than 2 times the maximum width of the blade.

In this new model, the drill blade is divided into an integrated structure design of front peak and back peak, the front peak is consistent with the rotation direction of the drill, and the front peak cutting edge is designed to be a 45° thin-to-thick structure in the horizontal direction. The direction is designed as a gradient structure of 65° and 45°, so that the blade of the core drill can be made into a structure with inconsistent thickness and thickness. Improve the cutting force of the blade to the rock, so as to greatly improve the cutting force and cracking effect of the diamond coring blade on the rock when rotating the core, and at the same time increase the downward force of the blade, and increase the distance between the blade and the shank. It is easier to ensure the integrity and efficiency of core drilling, as well as blade stability.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments;

Fig. 1 is a schematic diagram of the new structure;

Figure 2 is a schematic structural diagram of a front view of a blade;

3 is a schematic structural diagram of a side view of a blade;

Figure 4 is a schematic diagram of the force structure between the blade face and the rock formation during sampling;

Figure 5 is a schematic diagram of the force structure between the cutting edge I and cutting edge II and the rock formation during sampling.

Detailed ways

In order to facilitate the construction of the technical means, creation features, achievement goals and effects of the present invention, the present invention will be further described below with reference to the specific embodiments.

As shown in Figures 1-4, a wedge-shaped diamond core drill includes a cutter bar 1 and a blade 2, wherein the cutter bar 1 is a hollow cylindrical cavity structure, and there are several blades 2, which surround the axis of the cutter bar 1 and the front end of the cutter bar 1 Surface connection, the blade 2 includes a front peak 21 and a back peak 22, wherein the back peak 22 is located on the rear side of the forward 21, and is connected with the rear side of the forward 21, and the cutting direction of the forward 21 is consistent with the rotation direction of the cutter bar 1, and the cutting direction of the back peak 22 is the same as that of the front 21. The rotation direction of the cutter bar 1 is opposite, the back peak 22 is a prismatic structure, and its upper end surface is at least 0.5 mm lower than the upper end surface of the forward 21, and the front peak 21 is a wedge-shaped body structure, including the cutting edge I211, the cutting edge II212, and the cutting edge surface I213 , blade face II 214, blade face III 215, blade face IV 216, the blade edge II 212 and the blade edge I 211 are integral structures, and the blade edge I 211 is located below the blade edge II 212, the blade edge I 211 and the horizontal plane are at an angle of 50°-70° , the blade edge II212 is at an angle of 30°-50° with the horizontal plane, the inner side of the front peak 21 corresponding to the blade edge I211 is provided with a blade edge surface I213, the outer side is provided with a blade edge surface II214, and the inner side of the front peak 21 corresponding to the blade edge II212 is provided with a blade edge surface Ⅲ215, the outer side is provided with blade face IV216, blade face I213, blade face II214 intersect, blade face III215 and blade face IV216 intersect, and form an angle of 30°-50°, and blade face I213, blade face II214, blade face III215, The blade surface IV216 is of arc surface structure.

Preferably, the knife edge II 212 and the knife edge I 211 have an integral structure, and the knife edge I 211 is located below the knife edge II 212, the knife edge I 211 and the horizontal plane form an angle of 65°, and the knife edge II 212 and the horizontal plane form an included angle of 45°; Face I 213 intersects with blade face II 214, and blade face III 215 intersects with blade face IV 216, and they all form an included angle of 45°.

In this embodiment, the front peak 21 and the back peak 22 of the blade 2 are in an integrated structure, and each blade 2 and the front end surface of the blade shank 1 are connected by at least one of a chute, a pin, and a bolt structure. 2 and the front end face of the cutter bar 1 can also be connected by welding.

By adopting a split structure between the blade and the shank, the distribution position of the blade can be flexibly adjusted according to the needs of the coring operation, and at the same time, when the local blade is damaged during the coring operation, it can be flexibly replaced and maintained.

Further optimized, the distance between the blades 2 connected to the front end surface of the cutter bar 1 is 0-10 mm, and the total length of each blade 2 is not less than 80% of the circumference of the front end surface of the cutter bar 1 .

At the same time, the outer side of the connecting surface of the front peak 21 and the back peak 22 of the blade 2 is flush with the outer side of the cutter bar 1, and the curved surfaces of the cutting edge surface II 214 and the cutting edge surface IV 216 are radians consistent with the drill rod, and the cutting edge I 211, the cutting edge The port II 212 and the rotation direction of the tool holder 1 are kept on the same arc line.

The arc structure design can effectively increase the contact area between each cutting edge face of the forward and the rock, exert the maximum cutting force of the cutting edge face, and improve the efficiency of coring operation.

In this embodiment, the back peak 22 is a quadrangular pyramid structure whose axial interface is an isosceles shape and a right-angled trapezoid, and its inner and outer sides are the same as those of the blade face III215 and the blade face IV216. The surface structure of the axis distribution.

By increasing the contact area between the back peak and the front peak, the reaction force to the front peak is increased, and the stability of the blade is improved; the height of the back peak is slightly lower than the front peak, the purpose is to avoid the direct contact between the back peak and the rock, and ensure that the front peak and the rock are in direct contact with each other. drilling efficiency.

For further optimization, the upper end surfaces of the front peak 21 and the back peak 22 are distributed parallel to the front end surface of the blade shank 1 , and the height of the front edge 21 is not less than twice the maximum width of the blade 2 .

As shown in Figures 4 and 5, during the actual coring operation:

By setting the intersection of cutting edge I and cutting edge II, intersection of cutting edge surface III and cutting edge surface IV, and forming a thin-to-thick structure with an included angle of 45°, since the two cutting edge surfaces of the cutting edge form a 45° angle, there will be a vertical relationship with these two. The component forces F1 and F2 on the blade face, these two components will act on the rock at the same time, the purpose is to increase the cracking effect on the rock, and because the blade edge is thin to thick structure, the resistance F between the blade edge and the rock will be decrease, the cutting force to the rock increases;

By setting the knife edge II and the knife edge I into an integrated structure, and the knife edge I is located below the knife edge II, the knife edge I and the horizontal plane form an included angle of 65°, and the knife edge II and the horizontal plane have a 45° included angle structure. When taking the core, since the force of the rock to the cutting edge is mostly horizontal forces F4, F6, etc. and some non-horizontal forces F3, F5, etc., the cutting edge is designed to be a gradient structure of 65° and 45° in the vertical direction. The blade generates a downward component force Fa on the vertical plane to the bottom of the blade, which increases the stability of the blade, prevents the blade from separating from the shank, and improves the stability and reliability of the core drilling equipment.

In this new model, the drill blade is divided into an integrated structure design of front peak and back peak, the front peak is consistent with the rotation direction of the drill, and the front peak cutting edge is designed to be a 45° thin-to-thick structure in the horizontal direction. The direction is designed as a gradient structure of 65° and 45°, so that the blade of the core drill can be made into a structure with inconsistent thickness and thickness. Improve the cutting force of the blade to the rock, so as to greatly improve the cutting force and cracking effect of the diamond coring blade on the rock when rotating the core, and at the same time increase the downward force of the blade, and increase the distance between the blade and the shank. It is easier to ensure the integrity and efficiency of core drilling, as well as blade stability.

The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and improvements fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. a wedge-shaped diamond coring bit is characterized in that: the described wedge-shaped diamond coring bit comprises a cutter bar and a blade, wherein the cutter bar is a hollow cylindrical cavity structure, and the blades are several, surrounding the cutter bar The axis is connected with the front end face of the cutter bar, and the blade includes a front peak and a back peak, wherein the back peak is located on the back side of the front end, and is connected with the back side of the front end, and the forward cutting direction is consistent with the rotation direction of the cutter bar, and the back peak cutting direction is the same as that of the front end. The rotation direction of the tool bar is opposite, the back peak is a prismatic structure, and its upper end surface is at least 0.5 mm lower than the upper end surface of the forward. , blade surface II, blade surface III, blade surface IV, the blade edge II and the blade edge I have an integrated structure, and the blade edge I is located below the blade edge II, the blade edge I and the horizontal plane are at 50°-70° The included angle, the blade edge II and the horizontal plane are at an angle of 30°-50°, the inner side of the front peak corresponding to the blade edge I is provided with a blade surface I, and the outer side is provided with a blade surface II, and the front peak corresponding to the blade edge II is set. The blade face III is set on the side, and the blade face IV is set on the outer side. The blade face I and the blade face II intersect and form an included angle of 30°-50°. , and the blade face I, blade face II, blade face III, and blade face IV are all arc surface structures. 2. A kind of wedge-shaped diamond coring drill bit according to claim 1 is characterized in that: the front peak and the back peak of the blade are of an integrated structure, and each blade and the front end face of the shank pass through the chute, At least one of the pin and bolt structure is connected, and at the same time, the blade and the front end face of the tool holder can be connected by welding. 3. A kind of wedge-shaped diamond coring drill bit according to claim 1, it is characterized in that: the spacing between the blades connected by the front end face of the shank is 0-10 mm, and the total length of each blade is not less than the front end of the shank 80% of the perimeter of the face. 4. a kind of wedge-shaped diamond coring drill bit according to claim 1, is characterized in that: the outer side surface of described blade front peak and back peak connection surface is flush with the outer side surface of the cutter bar, and the blade surface II and the blade edge The curved surface of the surface IV adopts the same arc as the drill rod, and the cutting edge I, the cutting edge II and the rotation direction of the cutting rod are kept on the same arc line. 5. a kind of wedge-shaped diamond core drill bit according to claim 1, is characterized in that: described back peak is the quadrangular pyramid structure that axial interface is any one in isosceles question type and right-angled trapezoid, and its Both the inner and outer sides are curved surfaces coaxially distributed with the blade face III and the blade face IV. 6. a kind of wedge-shaped diamond coring drill bit according to claim 1, is characterized in that: described front peak and back peak upper end face are all distributed in parallel with the front end face of the shank, and the front height is not less than 2 of the maximum width of the blade. times.

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