Bushing hammer with polycrystalline diamond tip
By using small protrusions made of polycrystalline diamond on the bushing hammer and connecting them by brazing, the problem of severe hammer head wear was solved, resulting in improved wear resistance and extended service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN CYCLONE NEW MATERIALS TECHNOLOGY CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-07-21
AI Technical Summary
The protrusions on the existing bushing hammer head wear severely, resulting in a short service life. It is necessary to improve wear resistance to extend service life.
Small protrusions made of polycrystalline diamond replace tungsten carbide protrusions and are connected by brazing, allowing for the replacement of individual or all protrusions to extend service life.
It significantly improves the wear resistance of the small protrusions, extends the service life of the bushing hammer, and extends the overall tool life through the replacement mechanism.
Smart Images
Figure CN224527134U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of building construction and stone processing, and in particular to a bushing hammer with a polycrystalline diamond hammerhead. Background Technology
[0002] A bushing hammer is a tool used for surface finishing of stone or concrete. It can create specific textures on stone or concrete surfaces to achieve effects such as slip resistance, removal of old coatings, or roughening of the stone's outer surface. A typical bushing hammer consists of a single hammerhead and a handle; the outer end of the hammerhead has evenly distributed outward-facing protrusions. These protrusions directly abut against the stone or concrete surface. The handle is used to connect other drive tools, such as angle grinders, handheld polishers, floor polishers, etc. Bushing hammers are made of tungsten carbide cemented carbide to improve wear resistance. However, in actual use, most bushing hammer failures are caused by severe wear of the hammerhead, including but not limited to severe wear of the protrusions. Severe wear of the hammerhead significantly reduces the service life of the bushing hammer. Improving the wear resistance of the bushing hammer head and extending the service life of the bushing hammer are problems that bushing hammer manufacturers currently need to solve. Utility Model Content
[0003] The purpose of this invention is to solve the above-mentioned problems and provide a bushing hammer with a polycrystalline diamond hammerhead.
[0004] The technical solution of this utility model is: a bushing hammer with a polycrystalline diamond hammerhead includes a hammerhead and a hammer handle connected end to end; several small protrusions are fixedly installed on the end face of the hammerhead; the small protrusions are polycrystalline diamond; the hardness of polycrystalline diamond is higher than that of tungsten carbide cemented carbide, which can effectively improve the wear resistance of the small protrusions, thereby improving the overall service life of the bushing hammer.
[0005] Preferably, the hammer handle has several connecting keyways distributed around its circumference to facilitate connection with tools such as angle grinders, handheld polishers, and floor polishers.
[0006] Furthermore, the connecting keyway includes a semi-through slot and a closed slot; the semi-through slot extends through the tail end of the hammer shank; the semi-through slot and the closed slot can increase the types of tools that a single bushing hammer can connect to.
[0007] Furthermore, there are two semi-through slots; there are two closed slots; the two semi-through slots are arranged opposite each other; the two closed slots are arranged opposite each other.
[0008] Furthermore, the tail end of the hammer handle is chamfered to facilitate insertion of the hammer handle into other transmission tools.
[0009] Furthermore, the hammerhead is square in shape; the front end and four sides of the hammerhead are flat; the rear end of the hammerhead is a spherical surface that connects to the hammer handle; the pressure from the stone or concrete surface on the small protrusion can be transmitted to the hammer handle through this spherical surface to prevent root cutting.
[0010] Furthermore, the spherical surface is concentrically positioned with the hammer handle, allowing the force applied by the hammer handle to be transmitted evenly and stably to the small protrusion.
[0011] Furthermore, the hammer handle includes a force-transmitting shaft and a mounting shaft connected end to end; the outer diameter of the force-transmitting shaft is greater than the outer diameter of the mounting shaft; the force-transmitting shaft is used to transmit force to the transmission tool; the mounting shaft is used to connect with the transmission tool.
[0012] Furthermore, a fillet is provided between the mounting shaft and the force transmission shaft to facilitate machining and forming.
[0013] Furthermore, the small protrusions are bullet-shaped overall; the tips of the small protrusions are rounded to improve their wear resistance.
[0014] Furthermore, the small protrusions are made of polycrystalline diamond composite material; the hammer head end face is densely covered with mounting holes corresponding to the small protrusions; the small protrusions are embedded in the mounting holes to achieve a stable connection; the small protrusions are brazed to the outer surface of the hammer head; when a small protrusion is severely worn, the brazed weld can be removed, the small protrusion can be replaced, and then brazed again to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer.
[0015] Furthermore, the front end face of the hammer head is also provided with a panel integrated with several small protrusions; the panel is brazed to the front end face of the hammer head; when the small protrusions are severely worn, the brazed weld can be removed, all the small protrusions can be replaced, and then brazed again to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer.
[0016] The beneficial effects of this utility model are as follows: The bushing hammer with polycrystalline diamond hammerhead of this utility model has the following advantages: (1) In this utility model, the small protrusion made of tungsten carbide hard alloy is replaced with a small protrusion made of polycrystalline diamond, which can greatly improve the wear resistance of the small protrusion and extend the service life of the bushing hammer. (2) The small protrusion of this utility model is embedded in the mounting hole to achieve a stable connection; the small protrusion is brazed to the outer surface of the hammer head; when a small protrusion is severely worn, the brazed weld can be removed, the small protrusion can be replaced, and then brazed to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer. (3) The small protrusions of this utility model form a polycrystalline diamond composite sheet structure with the panel; when the small protrusions are severely worn, the brazing weld can be removed, all the small protrusions can be replaced, and then brazing can be performed to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer. Attached Figure Description
[0017] Figure 1 This is a perspective view of the bushing hammer with a polycrystalline diamond hammerhead in Embodiment 1. Figure 2 yes Figure 1 A partial sectional view from the front; Figure 3 yes Figure 2 AA section view; Figure 4 yes Figure 2 BB cross-sectional view; Figure 5 This is a perspective view of the bushing hammer with a polycrystalline diamond hammerhead in Embodiment 2; Figure 6 yes Figure 5 A partial sectional view from the front; In the diagram: 1. Hammer head, 11. Small protrusion, 111. Rounded corner, 12. Spherical surface, 13. Mounting hole, 14. Panel, 141. Front plate, 142. Rear plate, 211. Semi-through groove, 212. Closed groove, 22. Chamfer, 23. Force transmission shaft, 24. Mounting shaft, 25. Rounded corner. Detailed Implementation
[0018] Example 1: See Figure 1-4 A bushing hammer with a polycrystalline diamond hammerhead includes a hammerhead 1 and a hammer handle connected end to end; a plurality of small protrusions 11 are fixedly installed on the end face of the hammerhead 1; the small protrusions 11 are made of polycrystalline diamond; the hardness of polycrystalline diamond is higher than that of tungsten carbide cemented carbide, which can effectively improve the wear resistance of the small protrusions 11, thereby increasing the overall service life of the bushing hammer. In this embodiment, there are 14 small protrusions 11 arranged in an array.
[0019] Compared with the prior art, this utility model replaces the small protrusion 11 made of tungsten carbide cemented carbide with the small protrusion 11 made of polycrystalline diamond, which can greatly improve the wear resistance of the small protrusion 11 and extend the service life of the bushing hammer.
[0020] The hammer handle has several keyways distributed around its circumference, which facilitates connection with tools such as angle grinders, handheld polishers, and floor polishers.
[0021] The connecting keyway includes a semi-through groove 211 and a closed groove 212; the semi-through groove 211 extends through the tail end of the hammer handle; the semi-through groove 211 and the closed groove 212 can increase the types of tools that can be connected to a single bushing hammer.
[0022] There are two semi-through slots 211; there are two closed slots 212; the two semi-through slots 211 are arranged opposite to each other; the two closed slots 212 are arranged opposite to each other.
[0023] The hammer handle has a chamfered edge of 22 at the end, which makes it easier to insert the hammer handle into other transmission tools.
[0024] The hammer head 1 is generally square; the front end and four sides of the hammer head 1 are flat; the rear end of the hammer head 1 is a spherical surface 12 that connects to the hammer handle; the small protrusion 11 can transmit the pressure from the stone or concrete surface to the hammer handle through the spherical surface 12 to prevent root cutting.
[0025] The spherical surface 12 is concentrically positioned with the hammer handle, so that the force applied by the hammer handle can be transmitted evenly and stably to the small protrusion 11.
[0026] The hammer handle includes a force transmission shaft 23 and a mounting shaft 24 connected end to end; the outer diameter of the force transmission shaft 23 is greater than the outer diameter of the mounting shaft 24; the force transmission shaft 23 is used to transmit force to the transmission tool; the mounting shaft 24 is used to connect with the transmission tool.
[0027] A fillet 25 is provided between the mounting shaft 24 and the force transmission shaft 23 to facilitate machining and forming.
[0028] The small protrusion 11 is bullet-shaped; the head of the small protrusion 11 has a rounded corner 111, which improves the wear resistance of the small protrusion 11.
[0029] The small protrusion 11 is made of polycrystalline diamond composite material; the end face of the hammer head 1 is densely covered with mounting holes 13 that correspond to and match the small protrusion 11; the small protrusion 11 is embedded in the mounting hole 13 to achieve a stable connection; the small protrusion 11 is brazed to the outer surface of the hammer head 1; when a small protrusion 11 is severely worn, the brazed weld can be removed, the small protrusion 11 can be replaced, and then brazed again to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer.
[0030] The working principle of this embodiment: Polycrystalline diamond has a higher hardness than tungsten carbide cemented carbide, which can effectively improve the wear resistance of the small protrusion 11, thereby increasing the overall service life of the bushing hammer. The connecting keyway facilitates the connection of the bushing hammer with tools such as angle grinders, handheld polishers, and floor polishers. The semi-through groove 211 and the closed groove 212 can increase the types of tools that can be connected to a single bushing hammer. When a small protrusion 11 is severely worn, the brazing weld can be removed, the small protrusion 11 can be replaced, and then brazing can be performed to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer.
[0031] 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 the front end face of the hammer head 1 is also provided with a panel 14 integrated with several small protrusions 11. The panel 14 is brazed to the front end face of the hammer head 1. When the small protrusions 11 are severely worn, the brazed weld can be removed, all small protrusions 11 can be replaced, and then brazed to form a bushing hammer that can continue to be used, thus extending the service life of the bushing hammer.
[0032] The small protrusion 11 is made of polycrystalline diamond; the panel 14 includes a front plate 141 made of the same material as the small protrusion 11 and a rear plate 142 made of cemented carbide; the front plate 141 and the rear plate 142 are stacked on each other; the small protrusion 11 and the panel 14 are formed together by high temperature and high pressure method.
Claims
1. A bushing hammer with a polycrystalline diamond hammerhead, comprising a hammerhead and a hammer handle joined end to end; a plurality of small protrusions are fixedly mounted on the end face of the hammerhead; characterized in that, The small protrusion is made of polycrystalline diamond; the hammerhead is square in shape; the front end and four sides of the hammerhead are flat; the rear end of the hammerhead is a spherical surface that connects to the hammer handle.
2. The bushing hammer with a polycrystalline diamond hammerhead according to claim 1, characterized in that: Several connecting keyways are distributed around the circumference of the end of the hammer handle.
3. The bushing hammer with a polycrystalline diamond hammerhead according to claim 2, characterized in that: The connecting keyway includes a semi-through groove and a closed groove; the semi-through groove extends through the tail end of the hammer handle.
4. The bushing hammer with a polycrystalline diamond hammerhead according to claim 1, characterized in that: The spherical surface is concentric with the hammer handle.
5. The bushing hammer with a polycrystalline diamond hammerhead according to claim 1 or 4, characterized in that: The hammer handle includes a force transmission shaft and a mounting shaft connected end to end; the outer diameter of the force transmission shaft is greater than the outer diameter of the mounting shaft.
6. The bushing hammer with a polycrystalline diamond hammerhead according to claim 5, characterized in that: A fillet is provided between the mounting shaft and the force transmission shaft.
7. The bushing hammer with a polycrystalline diamond hammerhead according to claim 6, characterized in that: The small protrusion is bullet-shaped overall; the tip of the small protrusion has rounded corners.
8. The bushing hammer with a polycrystalline diamond hammerhead according to claim 1 or 7, characterized in that: The small protrusions are made of polycrystalline diamond composite material; the hammer head end face is densely covered with mounting holes that correspond to and match the small protrusions; the small protrusions are embedded in the mounting holes; the small protrusions are brazed to the outer surface of the hammer head.
9. The bushing hammer with a polycrystalline diamond hammerhead according to claim 1 or 7, characterized in that: The front end face of the hammerhead is also provided with a panel integrated with several small protrusions; the panel is brazed to the front end face of the hammerhead.