Straight line type PDC and its half piece anchor rod drill bit

Abstract

The utility model relates to a kind of linear diamond compact (PDC) and half piece anchor rod drill bit;The linear diamond compact (PDC) includes base body and diamond layer covered in the top surface of base body, and linear diamond compact is semicylindrical;The side of linear diamond compact includes the arc surface and main plane of junction;The top edge of diamond layer is set as the inclined surface of taper, and the inclined surface and the side of diamond layer form arc blade edge intersection;The side of main plane and arc surface is provided with subplane, subplane is perpendicular to the bottom surface of diamond compact, and subplane and main plane form angle α. The linear diamond compact (PDC) and anchor rod drill bit of the utility model, set a subplane perpendicular to bottom surface, cut out the sharp edge formed by the junction of main plane and arc surface in diamond compact, can effectively improve the strength of diamond compact corner, avoid diamond compact collapse in the process of use.

Description

Technical Field

[0001] This utility model relates to the technical field of diamond composite sheets, and in particular to a linear diamond composite sheet (PDC) and its half-sheet anchor drill bit. Background Technology

[0002] In anchor bolt drill bits, a diamond composite sheet is installed at the top of the drill bit to cut the rock strata; a water outlet channel is provided at the center of the end of the anchor bolt drill bit to flush out rock cuttings from the drill hole through the chip removal groove of the drill bit. For example, Chinese Patent CN221896520U - A Diamond Composite Sheet Anchor Bolt Drill Bit, application date: 2023.12.15.

[0003] During drilling, a columnar core will also form at the location of the water outlet (see appendix). Figure 20 Under normal circumstances, the radial runout of the anchor drill bit can break the rock core. The broken rock core is cut and crushed by the diamond composite sheet and then discharged from the chip removal groove with the water flow.

[0004] In some rock strata with high hardness, the core sample is too hard, and when a fractured core sample comes into contact with a diamond composite sheet, it can easily break the diamond composite sheet (see appendix). Figure 20 This causes the device to malfunction.

[0005] Therefore, a diamond composite sheet that can avoid collision with the rock core is needed. Utility Model Content

[0006] The purpose of this invention is to solve the above-mentioned problems by providing a linear diamond composite sheet (PDC) and its half-piece anchor drill bit.

[0007] The technical solution of this utility model is: a linear diamond composite sheet (PDC), comprising a matrix and a diamond layer covering the top surface of the matrix, wherein the linear diamond composite sheet is semi-cylindrical;

[0008] The side surface of the linear diamond composite sheet includes an intersecting arc-shaped surface and a main plane. The top edge of the diamond layer is set as a conical inclined surface, with the angle between the inclined surface and the top surface of the diamond layer being 5°~25°. This inclined surface intersects with the side surface of the diamond layer to form an arc-shaped cutting edge, the height of which is lower than the height of the top surface of the diamond layer. A secondary plane is set on the side where the main plane intersects with the arc-shaped surface. The secondary plane is perpendicular to the bottom surface of the diamond composite sheet, and the angle between the secondary plane and the main plane is α; 25°≤α≤160°. Removing the sharp edges of the diamond composite sheet to form a flat surface can prevent the core from colliding with the sharp edges of the diamond composite sheet during drilling, thus preventing the diamond composite sheet from breaking during use.

[0009] Preferably, a vertical chamfer is provided at the connection between the secondary plane and the primary plane. This chamfer ensures that all surfaces in contact with the secondary plane, the primary plane, and the curved surface form obtuse angles, reducing stress concentration points on the diamond composite sheet and thus improving its strength.

[0010] Preferably, a transverse chamfer is provided at the junction of the secondary plane and the inclined surface, and a secondary chamfer is provided at the junction of this chamfer and the primary plane. The adjacent corners of the secondary plane and the inclined surface are all provided as cut-off chamfers, which can improve the strength of the diamond layer in the secondary plane of the linear diamond composite sheet and prevent breakage.

[0011] Preferably, the secondary plane is perpendicular to the bottom surface of the diamond composite sheet.

[0012] Preferably, the diameter of the composite sheet is R, and the width of the sub-plane is d, where 0.05R≤d≤0.2R.

[0013] A half-piece anchor drill bit includes a drill shank, a connecting part, and a composite plate mounting base; at least two wing-shaped bodies are connected above the drill shank, and the at least two wing-shaped bodies are spirally arranged around the axis of the drill shank; the composite plate mounting base is disposed on the top of the wing-shaped bodies; the drill shank is provided with a water outlet channel, which runs through the axis of the drill shank.

[0014] It also includes the aforementioned linear diamond composite sheet;

[0015] The shape of the composite plate mounting base matches the shape of the straight diamond composite plate; the straight diamond composite plate is installed inside the composite plate mounting base; the cutting edge of the straight diamond composite plate faces the outside of the composite plate mounting base;

[0016] The wing-shaped body has an inner side facing the vertical direction on the side near the water outlet channel, and the secondary plane of the straight diamond composite sheet does not extend beyond this inner side. This allows the edge of the main plane of the straight diamond composite sheet near the water outlet channel to be completely set within the composite sheet mounting base, so that the edge does not extend beyond the range of the composite sheet mounting base, thus avoiding collision and compression between the cut core and the straight diamond composite sheet, which would cause it to break.

[0017] Preferably, the straight-shaped diamond composite sheet is installed at an angle within the composite sheet mounting base, with the side of the straight-shaped diamond composite sheet closer to the water outlet channel higher than the other side. This allows the cutting edge of the anchor drill bit to be controlled on the cutting edge of the straight-shaped diamond composite sheet away from the water outlet channel, extending the service life of the diamond composite sheet.

[0018] Preferably, the subplane of the linear diamond composite sheet coincides with the subplane of the wing-shaped body; in this case, α > 90°. This type of anchor drill bit is simple to manufacture and has low processing costs.

[0019] Preferably, a chip removal channel is provided at the connection between the lower part of the wing-shaped body and the drill shank; this facilitates the timely removal of broken core fragments during drilling; the connecting part is located at the bottom of the drill shank, and the connecting part is provided with internal threads.

[0020] The beneficial effects of this utility model are as follows: The linear diamond composite sheet (PDC) and its half-piece anchor drill bit of this utility model have the following advantages:

[0021] The linear diamond composite sheet of this invention has a secondary plane perpendicular to the bottom surface. The sharp edge formed by the connection between the main plane and the arc surface of the diamond composite sheet is cut off, which can effectively improve the strength at the corners of the diamond composite sheet. When the composite sheet is installed on a half-piece anchor drill bit, the secondary plane of the composite sheet is located inside the composite sheet mounting seat of the wing-shaped body and does not protrude. The secondary plane is aligned with the inner side of the wing-shaped body, leaving space for the rock core and avoiding collision between the diamond composite sheet and the rock core, which would cause it to break. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the linear diamond composite sheet (PDC) in Embodiment 1 of this utility model;

[0023] Figure 2 This is a top view of the linear diamond composite sheet (PDC) in Embodiment 1 of this utility model. Figure 1 ;

[0024] Figure 3 This is a top view of the linear diamond composite sheet (PDC) in Embodiment 1 of this utility model. Figure 2 ;

[0025] Figure 4 This is a top view of the linear diamond composite sheet (PDC) in Embodiment 1 of this utility model. Figure 3 ;

[0026] Figure 5 This is a schematic diagram of the linear diamond composite sheet (PDC) in Embodiment 2 of this utility model;

[0027] Figure 6 yes Figure 5 Top view;

[0028] Figure 7 This is a schematic diagram of the linear diamond composite sheet (PDC) in Embodiment 3 of this utility model;

[0029] Figure 8 yes Figure 7 Top view;

[0030] Figure 9 This is a schematic diagram of the structure of the half-piece anchor drill bit in Example 4. Figure 1 ;

[0031] Figure 10 yes Figure 9 The front view;

[0032] Figure 11 This is a schematic diagram of the structure of the half-piece anchor drill bit in Example 4. Figure 2 ;

[0033] Figure 12 yes Figure 11 The front view;

[0034] Figure 13 This is a schematic diagram of the structure of the half-piece anchor drill bit in Example 5. Figure 1 (Removal of diamond composite sheet);

[0035] Figure 14 This is a schematic diagram of the structure of the half-piece anchor drill bit in Example 5. Figure 2 ;

[0036] Figure 15 yes Figure 14 The front view;

[0037] Figure 16-18 This is a physical reference drawing of this utility model;

[0038] Figure 19 This is a schematic diagram of the existing anchor drill bit drilling process;

[0039] Figure 20 This is a schematic diagram of the composite piece of a broken anchor drill bit in existing technology.

[0040] In the diagram: 00. Core, 1. Diamond composite sheet, 11. Matrix, 12. Diamond layer, 121. Inclined surface, 122. Cutting edge, 13. Secondary plane, 14. Principal plane, 15. Curved surface, 1314. Vertical chamfered surface, 13121. Transverse chamfered surface, 1400. Secondary chamfer.

[0041] 2. Anchor drill bit, 21. Drill shank, 22. Connecting part, 23. Wing-shaped body, 231. Composite plate mounting base, 232. Chip removal channel, 233. Inner side, 24. Water outlet channel.

[0042] In the figure, α is the angle between the principal plane and the secondary plane in a linear diamond composite sheet;

[0043] In the figure, R is the radius of the linear diamond composite sheet; d is the width of the sub-plane. Detailed Implementation

[0044] Example 1: See Figure 1-4A linear diamond composite sheet (PDC) includes a cemented carbide substrate 11 and a diamond layer 12 covering the top surface of the substrate 11. The linear diamond composite sheet 1 is semi-cylindrical.

[0045] The straight-line diamond composite sheet 1 has an adjacent arcuate surface 15 and a main plane 14 on its side. The top edge of the diamond layer 12 is set as a conical inclined surface 121, with the angle between the inclined surface 121 and the top surface of the diamond layer 12 being 5°~25°. The inclined surface 121 intersects with the side of the diamond layer 12 to form an arcuate cutting edge 122, the height of which is lower than the height of the top surface of the diamond layer 12. A secondary plane 13 is provided on the side of the main plane 14 that connects with the arcuate surface 15. The secondary plane 13 is perpendicular to the bottom surface of the diamond composite sheet 1, and the secondary plane 13 forms an angle α with the main plane 14; 25°≤α≤160°. Cutting off the sharp edges of the diamond composite sheet 1 to form a flat surface can prevent the core 00 from colliding with the sharp edges of the diamond composite sheet 1 during drilling, thus preventing the diamond composite sheet 1 from breaking during use.

[0046] The secondary plane 13 is perpendicular to the bottom surface of the diamond composite sheet 1.

[0047] The diameter of the composite sheet is R, and the width of the sub-plane 13 is d, where 0.05R≤d≤0.2R.

[0048] The working principle of this embodiment:

[0049] In this embodiment, the straight diamond composite sheet 1 has a secondary plane 13 cut out at one corner, which removes the sharp edge of one side of the diamond composite sheet 1, effectively improving the strength at the corner of the diamond composite sheet 1 and preventing the diamond composite sheet 1 from breaking during use.

[0050] Example 2: See Figure 5-6 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that a vertical chamfered surface 1314 is provided at the connection between the secondary plane 13 and the primary plane 14. After setting the chamfer at this position, the surfaces in contact with the secondary plane 13, the primary plane 14, and the arc-shaped surface 15 can all form obtuse angles, reducing stress concentration points on the diamond composite sheet 1, thereby improving the strength of the diamond composite sheet 1.

[0051] Example 3: See Figure 7-8 Example 3 is basically the same as Example 1, and the similarities will not be repeated. The difference is that a transverse chamfered surface 13121 is provided at the connection between the secondary plane 13 and the inclined surface 121, and a secondary chamfer 1400 is provided at the junction of this chamfer and the main plane 14. The adjacent corners of the secondary plane 13 and the inclined surface 121 are all provided as cut-off chamfers, which can improve the strength of the diamond layer 12 in the secondary plane 13 of the linear diamond composite sheet 1 and prevent breakage.

[0052] Example 4: See Figure 9-12 A half-piece anchor drill bit 2 includes a drill shank 21, a connecting part 22, and a composite plate mounting base 231; at least two wing-shaped bodies 23 are connected to the upper part of the drill shank 21, and the at least two wing-shaped bodies 23 are spirally arranged around the axis of the drill shank 21; the composite plate mounting base 231 is disposed on the top of the wing-shaped bodies 23; the drill shank 21 is provided with a water outlet channel 24, which runs through the axis of the drill shank 21.

[0053] It also includes the linear diamond composite sheet 1 described in Example 1;

[0054] The shape of the composite plate mounting base 231 matches the shape of the straight diamond composite plate 1; the straight diamond composite plate 1 is installed inside the composite plate mounting base 231; the cutting edge 122 of the straight diamond composite plate 1 faces the outside of the composite plate mounting base 231;

[0055] The wing-shaped body 23 has an inner side 233 on the side near the water outlet channel 24, and the secondary plane 13 of the straight diamond composite sheet 1 does not extend beyond the inner side 233. The edge of the main plane 14 of the straight diamond composite sheet 1 near the water outlet channel 24 can be completely set inside the composite sheet mounting base 231, so that the edge does not extend beyond the range of the composite sheet mounting base 231, thus avoiding collision and compression between the cut core 00 and the straight diamond composite sheet 1, which would cause it to break.

[0056] The straight diamond composite sheet 1 is installed at an angle inside the composite sheet mounting base 231, with the side of the straight diamond composite sheet 1 closer to the water outlet channel 24 higher than the other side. This allows the cutting edge of the anchor drill bit 2 to be controlled on the cutting edge 122 of the straight diamond composite sheet 1 on the side away from the water outlet channel 24, thus extending the service life of the diamond composite sheet 1.

[0057] A chip removal channel 232 is provided at the lower part of the wing-shaped body 23 where it connects to the drill shank 21; this facilitates the timely removal of broken core fragments during drilling; the connecting part 22 is located at the bottom of the drill shank 21, and the connecting part 22 has internal threads.

[0058] The working principle of this embodiment:

[0059] In this embodiment, the entire side of the straight diamond composite sheet 1 closest to the water outlet channel 24 is placed inside the composite sheet mounting base 231, which can greatly reduce the collision between the diamond composite sheet 1 and the core 00, thereby protecting the diamond composite sheet 1 from damage and extending the service life of the anchor drill bit 2.

[0060] Example 5: See Figure 13-15Example 5 is basically the same as Example 4, and the similarities will not be repeated. The difference is that the secondary plane 13 of the linear diamond composite sheet 1 coincides with the secondary plane 13 of the wing-shaped body 23; at this time, α > 90°. This type of anchor drill bit 2 is simple to manufacture and has low processing cost.

[0061] In the above embodiments, the secondary plane 13 of the linear diamond composite sheet 1 is aligned with the inner surface 233 of the wing-shaped body 23, as shown in the attached figure. Figure 9-15 As shown.

Claims

1. A linear diamond composite (PDC) sheet, comprising a matrix and a diamond layer covering the top surface of the matrix, characterized in that, The linear diamond composite sheet is semi-cylindrical; The side surface of the linear diamond composite sheet includes an intersecting arcuate surface and a main plane; the top edge of the diamond layer is set as a tapered inclined surface, which intersects with the side surface of the diamond layer to form an arcuate cutting edge; A secondary plane is provided on the side where the main plane meets the arc surface, and the secondary plane forms an angle α with the main plane; 25°≤α≤160°.

2. The linear diamond composite sheet (PDC) according to claim 1, characterized in that: A vertical chamfered surface is provided at the connection between the secondary plane and the primary plane.

3. The linear diamond composite sheet (PDC) according to claim 1, characterized in that: A transverse chamfer is provided at the connection between the secondary plane and the inclined plane, and a secondary chamfer is provided at the junction of the chamfer and the main plane.

4. The linear diamond composite sheet (PDC) according to claim 1, characterized in that: The secondary plane is perpendicular to the bottom surface of the diamond composite sheet.

5. The linear diamond composite sheet (PDC) according to claim 1, characterized in that: The diameter of the composite sheet is R, and the width of the sub-plane is d, where 0.05R≤d≤0.2R.

6. A half-piece anchor drill bit, comprising a drill shank, a connecting portion, and a composite plate mounting base; at least two wing-shaped bodies are connected above the drill shank, and the at least two wing-shaped bodies are spirally arranged around the axis of the drill shank; the composite plate mounting base is semi-circular and disposed on the top of the wing-shaped bodies; the drill shank is provided with a water outlet channel, which extends along the axis of the drill shank; characterized in that: It also includes the linear diamond composite sheet as described in any one of claims 1-5; The shape of the composite plate mounting base matches the shape of the straight diamond composite plate; the straight diamond composite plate is installed inside the composite plate mounting base; the cutting edge of the straight diamond composite plate faces the outside of the composite plate mounting base; The wing-shaped body has an inner surface facing the vertical direction on the side near the water outlet channel, and the sub-plane of the linear diamond composite sheet does not extend beyond this inner surface.

7. The half-piece anchor drill bit according to claim 6, characterized in that: The straight diamond composite sheet is installed at an angle in the composite sheet mounting base, with the side of the straight diamond composite sheet closer to the water outlet channel higher than the other side.

8. The half-piece anchor drill bit according to claim 6, characterized in that: The subplane of the linear diamond composite sheet coincides with the subplane of the wing-shaped body.

9. The half-piece anchor drill bit according to claim 6, characterized in that: A chip removal channel is provided at the lower part of the wing-shaped body where it connects to the drill shank; the connecting part is located at the bottom of the drill shank, and the connecting part has an internal thread.

Images