Hard alloy blade with positioning function and self-bottoming mechanical anchor bolt thereof

Abstract

The application discloses a hard alloy blade with a positioning function and a self-bottoming mechanical anchor bolt thereof, the anchor bolt is composed of a sleeve and an anchor rod; the blade is embedded into the top surface of the sleeve of the self-bottoming mechanical anchor bolt for anchoring in concrete and is composed of a cutting top and a base in an integrated structure; the cutting top is provided with a cutting part composed of multiple sharp edges; the base body is a cube or a trapezoidal body with inclined surfaces, the two side surfaces of the cube or the trapezoidal body are provided with fins with longitudinally or transversely arranged convex structures, and the fins are used for embeddedly cooperating with and fixedly arranged in the fin grooves of the preset fin grooves of the sleeve top surface. The fins, the positioning fins and the shape of the blade groove of the application are matched with each other, so that the positioning accuracy of the blade relative to the expansion piece of the anchor bolt in the axial and radial directions and the welding seam strength can be effectively improved; the freedom degree of the blade in the blade groove is reduced, and the blade can also play a certain supporting role when the welding seam fails in the use process; the anchor bolt can realize the accurate positioning of the blade of the self-bottoming mechanical anchor bolt and improve the welding and installation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of fastener design technology, and more particularly to the field of building concrete fastener design technology. Specifically, it relates to a carbide blade with positioning function and its self-cutting mechanical anchor. Background Technology

[0002] Self-cutting mechanical anchors, widely used in the construction industry as a post-anchoring technology, work by using specialized installation tools to rotate and cut the bottom of the concrete hole with a blade at the end of the cutting sleeve, creating an inverted conical hole and ultimately forming a stable mechanical locking key. They offer advantages such as simple installation and excellent anchoring effect. They are widely used in the installation of various electromechanical equipment and steel structural components in concrete construction, including post-construction renovation and reinforcement.

[0003] The carbide cutting edge at the end of the self-cutting mechanical anchor bolt is connected to the undercutting sleeve by brazing. The positioning accuracy of the carbide cutting edge relative to the undercutting sleeve and the quality of the brazing determine the quality of the inverted conical hole formed by the anchor bolt cutting the concrete, thus affecting the anchoring performance of the anchor bolt. Existing brazing positioning of the carbide cutting edge and the undercutting sleeve uses positioning fixtures or special mechanical jaws for positioning, which has poor positioning accuracy. Moreover, after welding a certain number of anchor bolts, the positioning fixture will deform due to heat, and its positioning accuracy must be re-measured. In addition, the process of welding the carbide cutting edge is complex and inefficient. Summary of the Invention

[0004] This invention discloses a carbide cutting tool with positioning function and its self-cutting mechanical anchor bolt, addressing the shortcomings of existing technologies. The purpose of this invention is to provide a carbide cutting tool with high positioning accuracy and high cutting tool welding efficiency, along with its self-cutting mechanical anchor bolt.

[0005] This invention is achieved through the following technical solution:

[0006] This invention first discloses a carbide blade with positioning function, which is embedded in the top surface of a sleeve for anchoring a self-cutting mechanical anchor bolt in concrete. The blade is characterized in that: the blade is composed of a cutting top and a base of one integral structure; the cutting top has a cutting part composed of multiple sharp edges; the base body is a cube or a trapezoidal body with inclined surfaces, and the two sides of the cube or trapezoidal body are provided with fins with longitudinal or transversely arranged protruding structures, which are used to be embedded and fixed with the fin grooves preset in the blade groove on the top surface of the sleeve.

[0007] Furthermore, the base body has a positioning piece at the front or rear end of its bottom surface that cooperates with the positioning groove in the tool groove for positioning.

[0008] Furthermore, the base body is a cube, and the two sides of the cube are provided with fins with longitudinally or laterally arranged protruding structures.

[0009] Furthermore, another structure of the base body is a trapezoidal body with a dovetail shape.

[0010] The present invention also discloses a self-cutting mechanical anchor bolt using the aforementioned blade, wherein the anchor bolt consists of a sleeve and an anchor rod.

[0011] Furthermore, the anchor rod has a conical bottom, a threaded top, and a non-threaded middle section; the sleeve is a hollow cylinder with an installation slot at the top that matches the installation tool, and a deformation groove and several expansion plates divided by a number of axial slits at the end of the sleeve. A support ring is fitted into the deformation groove, and the blades are fixed to the tops of the spaced-apart expansion plates.

[0012] Furthermore, the thickness of the deformation groove gradually decreases along the axial direction towards the outer end of the expansion piece.

[0013] Furthermore, the slit extends from the end of the sleeve to the inside of the deformation groove.

[0014] Furthermore, the end of the expansion plate is provided with a cutting groove that mates with the carbide blade. The circumferential side walls of the cutting groove have longitudinally or transversely arranged fin grooves that match the fins of the blade. After installation and fixing, each blade protrudes axially from the top surface of the expansion plate by 0.1 to 5 mm relative to the sleeve and radially from the side surface of the expansion plate by 0.1 to 2 mm. It is centered on the centerline of the expansion plate and is inclined at an angle of -60° to 60° relative to the centerline of the expansion plate.

[0015] Furthermore, the bottom surface of the blade groove is provided with a circumferentially arranged positioning groove that matches the blade positioning piece at the radial front end and / or rear end.

[0016] The carbide positioning insert and its anchor bolt of this invention have the following technical advantages compared with the prior art: the shape of the insert's fins, positioning pieces, and the cutter groove matches, effectively improving the axial and radial positioning accuracy of the insert relative to the anchor bolt expansion piece. The increased inner surface area of ​​the cutter groove increases the weld length and further enhances the weld strength. The multi-shaped insert in the cutter groove has reduced degrees of freedom compared to ordinary inserts, and can still provide some support in case of weld failure during use. The carbide positioning insert and its anchor bolt of this invention can achieve precise positioning and improved installation and welding efficiency of self-cutting mechanical anchor bolt inserts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the anchor bolt of the present invention.

[0018] Figure 2 This is a schematic diagram of the anchor bolt and anchor rod of the present invention.

[0019] Figure 3 This is a schematic diagram of the anchor bolt sleeve of the present invention.

[0020] Figure 4 This is a schematic diagram of the sleeve expansion piece of the present invention.

[0021] Figure 5 This is a schematic diagram of the second sleeve expansion piece of the present invention.

[0022] Figure 6 This is a schematic diagram of the sleeve expansion piece of the present invention.

[0023] Figure 7 yes Figure 6 Enlarged schematic diagram of the center groove.

[0024] Figure 8 This is a schematic diagram of the sleeve cutter head of the present invention.

[0025] Figure 9 This is a schematic diagram of the sleeve expansion piece of the present invention.

[0026] Figure 10 yes Figure 9 Enlarged schematic diagram of the center groove.

[0027] Figure 11 This is a schematic diagram of the blade of the present invention.

[0028] Figure 12 This is a schematic diagram of the second blade of the present invention.

[0029] Figure 13 This is a schematic diagram of the blade of the present invention.

[0030] In the diagram, 1—sleeve, 2—support ring, 3—blade, 4—anchor bolt; 1.1—anti-detachment hole, 1.2—installation slot, 1.3—installation mark line, 1.4—deformation groove, 1.5—expansion plate; 1.6—slit, 1.7—knife groove, 1.8—fin groove, 1.9—positioning groove; 3.1—fin, 3.2—positioning plate; 4.1—threaded section, 4.2—unthreaded section, 4.3—conical section. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principles of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the scope of protection of the present invention.

[0032] Refer to the attached diagram.

[0033] As shown in the figure, the present invention provides a carbide blade with positioning function. The blade 3 is embedded in the top surface of the cutting sleeve 1 for anchoring mechanical anchors in concrete. The blade 3 is composed of a cutting top and a base with an integral structure. The cutting top has a cutting part composed of multiple sharp edges. The base body is a cube or a trapezoidal body with an inclined surface. The two sides of the cube or trapezoidal body are provided with fins 3.1 with longitudinal or transversely arranged protruding structures. The fins 3.1 are used to be embedded and fixed with the fin groove 1.8 preset in the blade groove 1.7 on the top surface of the sleeve.

[0034] A positioning piece 3.2, which mates with the blade positioning groove 1.9 in the blade groove 1.7, can also be provided at the front or rear end of the bottom of the blade base body. For example... Figures 4 to 13 As shown.

[0035] The cube base has fins 3.1 with longitudinally or laterally arranged protruding structures on both sides. For example... Figure 11 For longitudinally arranged fins 3.1, such as Figure 12 The fin 3.1 is arranged laterally. In the figure, fin 3.1 is semi-circular, but it can also be elliptical or other geometric shapes.

[0036] The base itself is a trapezoidal structure with a dovetail shape. For example... Figure 13 As shown, the use of a trapezoidal shape with a wide lower section and a tapering upper section, combined with the corresponding tool groove 1.7, can further provide stability and strength for installation and fixation.

[0037] like Figure 1 As shown, the self-cutting mechanical anchor bolt of the present invention consists of an anchor sleeve 1 and an anchor rod 4, with the blade 3 of the present invention embedded in the top surface of the anchor sleeve 1.

[0038] A support ring 2 is also provided at the end 1 of the anchor bolt sleeve. This prevents large concrete particles from entering the deformation groove during the bottom cutting process and prevents the expansion plates from opening unevenly due to concrete particles entering the deformation groove.

[0039] The anchor bolt 4 of this invention has a conical section 4.3 at the bottom, a threaded section 4.1 at the top, and an unthreaded section 4.2 in the middle. The sleeve is a hollow cylinder with an installation groove at the top that matches the installation tool. The end of the anchor bolt sleeve 1 is provided with a deformation groove 1.4 and several axially arranged slits 1.6 dividing the end of the sleeve into several expansion pieces 1.5. The expansion pieces 1.5 of this invention are divided into 4 to 8 pieces.

[0040] The deformation groove 1.4 is used to install the support ring 2, and its thickness gradually decreases along the axial direction towards the outer end of the expansion piece 1.5. For example... Figure 3 As shown.

[0041] The slit 1.6 extends from the end of the expansion piece 1.5 to the inside of the deformation groove 1.4. For example... Figures 3 to 9 As shown, the extended slits 1.6 are of the same length. Slits 1.6 can guide the deformation groove 1.4 to deform evenly during installation, avoiding inconsistent opening of the expansion pieces.

[0042] Blade 3 is fixed at intervals on expansion plate 1.5. Each blade 3 is positioned at the end of expansion plate 1.5 relative to the axial direction, protruding 0.1–5 mm axially from the top surface of expansion plate 1.5 and 0.1–2 mm radially from the side surface of expansion plate 1.5. It is centered on the centerline of expansion plate 1.5 and inclined at -60° to 60° relative to the centerline. The blade 3 protrudes outward from expansion plate 1.5 by a certain distance both axially and radially, which facilitates effective cutting of concrete during installation and guides the expansion plate 1.5 to open.

[0043] like Figure 1 As shown, the self-cutting mechanical anchor bolt for concrete of the present invention includes a sleeve 1, a support ring 2, a blade 3, and an anchor rod 4.

[0044] like Figure 2 As shown, the anchor bolt 4 consists of a threaded section 4.1, an unthreaded section 4.2, and a conical section 4.3.

[0045] like Figure 3 As shown, the sleeve 1 consists of an anti-disengagement hole 1.1, a mounting groove 1.2, a mounting mark line 1.3, a deformation groove 1.4, and a cutter head 1.5. Among them, the anti-disengagement hole 1.1 is a circular shape formed by stamping, and the deformation groove 1.4 is used to install the support ring 2. Its thickness gradually decreases along the axial direction towards the outer end of the expansion piece 1.5, so as to better support the expansion piece 1.5 of the cutter head during the installation process.

[0046] like Figures 4 to 8 As shown, the expansion piece 1.5 is evenly divided into several expansion pieces 1.5 by the slit 1.6, and blades 3 are inlaid on the spaced-apart expansion pieces 1.5. The blades 3 are made of cemented carbide or diamond. The blades 3 are positioned at the ends of the expansion pieces 1.5 relative to the axial direction, protruding 0.1-5 mm axially from the top surface of the expansion piece 1.5 and 0.1-2 mm radially from the side surface of the expansion piece 1.5. They are centered on the centerline of the expansion piece 1.5 and inclined at -60° to 60° relative to the centerline of the expansion piece 1.5.

[0047] Figure 4 The expansion plate 1.5 shown is divided into six expansion plates 1.5 by six slits 1.6. The upper ends of the three groups of expansion plates 1.5 are provided with knife grooves 1.7, and longitudinally arranged fin grooves 1.8 are provided on both sides of the knife grooves 1.7. Figure 4 The tool groove 1.7 shown is... Figure 11 The blade shown is compatible with blade 3.

[0048] Figure 5 The expansion plate 1.5 shown is divided into six expansion plates 1.5 by six slits 1.6. The upper end of the three sets of expansion plates 1.5 are provided with a knife groove 1.7, and the knife groove 1.7 is provided with transversely arranged fin grooves 1.8 on both sides of the circumference.

[0049] Figure 6 The expansion piece 1.5 shown has a cutting groove 1.7 in it. Figure 5 A positioning groove 1.9 was further added to the existing design. Figure 6 The tool groove 1.7 shown is... Figure 12 The blade shown is compatible with blade 3.

[0050] Figure 8 The expansion piece 1.5 shown is divided into six expansion pieces 1.5 by six slits 1.6. The upper ends of the three sets of expansion pieces 1.5 are provided with grooves 1.7, which are trapezoidal grooves with a dovetail structure. Figure 9 The expansion piece 1.5 shown has a groove 1.7 in... Figure 8 A positioning groove 1.9 was further added to the existing design. Figure 9 The tool groove 1.7 shown is... Figure 13 The blade shown is compatible with blade 3.

[0051] like Figures 11 to 13 As shown, the blade 3 has fins 3.1 on its side or positioning plates 3.2 on its bottom, or the lower half of the blade is a trapezoidal structure. All of these allow the blade 3 to have only one degree of freedom of movement. Furthermore, it is limited by the bottom of the groove 1.7 in the axial direction or by the positioning plates 3.2 in the radial direction, which can precisely limit the relative protrusion distance between the blade 3 and the expansion plate 1.5.

[0052] Install Figure 11 When using blade 3, Figure 4 The blade groove 1.7 and the blade 3 fin 3.1 are matched with the fin groove 1.8. They can be installed in place by moving from top to bottom. The radial direction restriction movement directly controls the radial direction protrusion distance of the blade 3.

[0053] Install Figure 12 When using blade 3, Figure 5 The blade groove 1.7 is of the form, with the positioning piece 3.2 of the blade 3 on the outer side. The fin 3.1 matches the fin groove 1.8 and moves from the outside to the inside until the positioning piece 3.2 contacts the outer surface of the expansion piece 1.5, at which point it is installed in place. Simultaneously... Figure 12 Blade 3 can also be used. Figure 6 The blade groove 1.7 is in the form of a positioning piece 3.2 on the inner side of the blade 3. The fin 3.1 moves from the inside to the outside of the matching fin groove 1.8 until the positioning piece 3.2 contacts the positioning groove 1.9, at which point it is installed in place.

[0054] Figure 13 Blade 3 can be used with Figure 8 and Figure 9 The tool groove 1.7 is matched for installation, and its installation method is the same as... Figure 12 Blade 3 Match Figure 5 and Figure 6The installation methods for the blade groove are completely identical. Because the relative protrusion distance between the blade 3 and the expansion piece 1.5 can be controlled through structural matching between the blade 3 and the blade groove 1.7, the above installation methods can all achieve quick installation of the blade 3, avoiding repeated positioning each time.

[0055] The working principle is as follows: The anchor bolt is inserted into a pre-drilled concrete hole and installed using a special anchor bolt installation tool. An electric hammer drives the installation tool to rotate the anchor bolt at high speed and hammer it. The expansion plate of the anchor bolt sleeve, equipped with a carbide blade, advances along the arc of the anchor bolt's cone head and radially opens to cut the bottom of the concrete hole, forming an inverted conical hole. After installation, the anchor bolt and concrete are interlocked, creating a mechanical locking effect. If a weld fails during installation, the radial fins or positioning plates mechanically lock the blade, preventing it from moving inward. Furthermore, the relative dimensional accuracy of the blade and expansion plate remains unchanged, ensuring the effective hole-forming effect of the expansion plate in cutting the concrete.

Claims

1. A carbide cutting tool with positioning function, the cutting tool being embedded in the top surface of a sleeve for anchoring a self-cutting mechanical anchor bolt into concrete, characterized in that: The blade consists of a one-piece cutting top and a base; the cutting top has a cutting section composed of multiple sharp edges; The base body is a cube or a trapezoid with a sloping surface. The two sides of the cube or trapezoid are provided with fins with longitudinal or transverse protrusions. The fins are used to fit and fix with the fin grooves preset in the top surface of the sleeve.

2. The carbide cutting tool with positioning function according to claim 1, characterized in that: The base body has a positioning piece at the front or rear end of its bottom surface that cooperates with the positioning groove in the tool groove for positioning.

3. The carbide cutting tool with positioning function according to claim 2, characterized in that: The base body is a cube, and the two sides of the cube are provided with fins with longitudinally or laterally arranged protruding structures.

4. The carbide cutting tool with positioning function according to claim 2, characterized in that: The base body is a trapezoidal structure with a swallowtail shape.

5. A self-cutting mechanical anchor bolt, comprising a sleeve and an anchor rod, characterized in that: The top surface of the sleeve is embedded with a blade as described in any one of claims 1 to 4.

6. The self-cutting mechanical anchor bolt according to claim 5, characterized in that: The anchor rod has a cone-shaped bottom, a threaded top, and an unthreaded middle section; the sleeve is a hollow cylinder with an installation slot at the top that matches the installation tool, and a deformation groove and several expansion plates divided by a number of axial slits at the end of the sleeve. A support ring is fitted into the deformation groove, and the blades are fixed to the tops of the spaced-apart expansion plates.

7. The self-cutting mechanical anchor bolt according to claim 6, characterized in that: The thickness of the deformation groove gradually decreases along the axial direction towards the outer end of the expansion piece.

8. The self-cutting mechanical anchor bolt according to claim 7, characterized in that: The slit extends from the end of the sleeve to the inside of the deformation groove.

9. The self-cutting mechanical anchor bolt according to claim 7, characterized in that: The end of the expansion plate is provided with a cutting groove that mates with a cemented carbide blade. The circumferential side walls of the cutting groove have longitudinally or transversely arranged fin grooves that match the fins of the blade. After installation and fixing, each blade protrudes axially from the top surface of the expansion plate by 0.1 to 5 mm relative to the sleeve and radially from the side surface of the expansion plate by 0.1 to 2 mm. It is centered on the centerline of the expansion plate and is inclined at an angle of -60° to 60° relative to the centerline of the expansion plate.

10. The self-cutting mechanical anchor bolt according to claim 7, characterized in that: The bottom surface of the blade groove is provided with a circumferentially arranged positioning groove that matches the blade positioning piece at the radial front end and / or rear end.

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