Hammer for a hammer crusher

Abstract

The application discloses a hammer head of a hammer crusher, which comprises a rotor shaft and a crusher hammer head connected to the rotor shaft, the crusher hammer heads are arranged at intervals between positioning discs, the gap between the crusher hammer head and the positioning disc is less than 3mm, the crusher hammer head comprises a hammer head and a hammer handle shank fixedly connected with the hammer head, the hammer handle shank is detachably connected with the hammer handle, a connecting hole is formed in the end of the hammer handle, the connecting hole is a through hole, a protection piece is arranged in the connecting hole, a chamfer space is reserved in the connecting hole formed in the end of the hammer handle, and the chamfer space is larger than the height of the extrusion position.

Description

Technical Field

[0001] This invention belongs to the technical field of the metallurgical industry, specifically relating to a hammer head for a hammer crusher. Background Technology

[0002] Hammer crusher rotor structure and working principle. The rotor is a crucial working component of the crusher, such as... Figure 1 As shown, it consists of parts such as rotor shaft, disc, hammer rod, and hammer head. Multiple hard hammer heads are mounted on the cylindrical surface of the rotor. The hammer heads are made of materials with good impact resistance and wear resistance and are hinged to the rotor disc. They can rotate and are easy to replace. When the material enters the crusher through the feed inlet, it is hit by the hammer heads on the rapidly rotating rotor. The material is repeatedly collided and crushed in the plate cavity and discharged from the discharge port at the bottom of the rotor.

[0003] During operation, hammer crushers may experience hammer breakage due to various reasons. The common causes are as follows.

[0004] The hammerhead structure consists of several parts: the front hammerhead, the small shaft, the middle hammer shank, and the lower hammer shank. The front hammerhead is made of wear-resistant alloy and is connected to the middle hammer shank by a pin. The middle and lower hammer shanks are welded from steel plates. The shaft hole and the welded joint between the middle and lower hammer shanks are the most prone to breakage. Once the hammerhead breaks and falls off, the crusher rotor will instantly lose its balance and generate violent vibration. The machine must be stopped immediately for inspection and repair. If the hammerhead breakage is not detected in time and the machine is not stopped immediately, the crusher will rotate violently for a long time, which will lead to serious equipment failure.

[0005] The hammerhead connection is welded together at the front, back, and sides. During the welding process, the lower steel plate is damaged by welding stress, creating a potential for cracking. Welding stress primarily arises from uneven heating and cooling during welding, leading to restricted material shrinkage and deformation. This stress includes thermal stress, structural stress, and a superposition of constraint stress. Thermal stress occurs when the weld area expands at high temperatures during welding, constrained by the surrounding low-temperature metal, and then shrinks again upon cooling, creating tensile stress. Structural stress occurs when metal phase transformations, such as austenite to martensite, are accompanied by volume changes and are constrained, generating structural stress. Constraint stress is also present; the greater the rigidity of the steel plate structure (e.g., a closed weld, where the middle and lower steel plates of the hammerhead essentially form a closed weld), the stronger the constraint and the higher the residual stress value, making deformation or cracking more likely. During crusher operation, due to continuous material impact, the deformation and cracks at the welded joint in the middle of the hammerhead continuously expand, eventually reaching the point of ultimate fracture.

[0006] After a period of use, the hammerhead wears out severely, and the rotor vibration intensifies, so the hammerhead must be replaced. Generally, the front wear-resistant hammerhead is replaced, but the gap between the wear-resistant hammerhead and the hammer handle pin is small, making it easy for dust to accumulate. Moreover, the maintenance space is too small, making it impossible to remove. Replacing the hammerhead and hammer handle as a whole is relatively easier. Generally, the entire hammerhead is replaced directly. The hammerhead shaft hole is easily caught between the two discs, making it very difficult to remove. Summary of the Invention

[0007] The purpose of this invention is to provide a hammer head for a hammer crusher to solve the problems mentioned in the background art.

[0008] The objective of this invention is achieved through the following technical solution: a hammer crusher hammer head, comprising a rotor shaft and crusher hammer heads connected to the rotor shaft, wherein the crusher hammer heads are spaced apart between positioning discs, the gap between the crusher hammer heads and the positioning discs is less than 3mm, and the crusher hammer head includes a hammer head and a hammer handle body fixedly connected to the hammer head, wherein the hammer handle body is detachably connected to the hammer handle;

[0009] The end of the hammer handle is fixedly provided with a connecting hole, which is a through hole, and a protective component is provided inside the connecting hole;

[0010] The end of the hammer handle has a connection hole with a chamfered space inside, and the chamfered space is larger than the height of the pile.

[0011] Furthermore, the hammer handle body has a groove structure that mates with the hammer handle, and the hammer handle body and the hammer handle are connected by bolts or by threaded connection by machining threads in the hammer handle body.

[0012] Furthermore, the side of the hammer handle connected to the hammer handle body is convex in shape, and a through hole is provided on the hammer handle, the through hole being arranged in a triangular pattern.

[0013] Furthermore, the protective component is a hollow steel sleeve, which is embedded in the connection hole and fixed by a stabilizing pin.

[0014] Furthermore, the chamfered space is formed on both sides of the connecting hole, and the hammer handle hole has a chamfer of 5×45 degrees. 0 The chamfered side is 5mm long.

[0015] Furthermore, the hole on the positioning disc opposite to the hammer handle that connects to the rotor shaft has a chamfer of 5×45 degrees. 0 The chamfered side is 5mm long.

[0016] Furthermore, the crusher hammer is a composite hammer made of medium carbon steel and high chromium cast iron, and is made by solid-liquid sand casting. The composite hammer has carbon steel as the base, and hard alloy blocks are distributed at intervals inside the base, and the hard alloy blocks are arranged along the crusher hammer.

[0017] The cemented carbide block includes a long alloy block and a short alloy block, wherein the length of the long alloy block is five times the length of the short alloy block.

[0018] Furthermore, the short alloy blocks are not spaced apart from the long alloy blocks.

[0019] Furthermore, the medium carbon steel is 45# steel, and the cemented carbide block is made of 4Cr22MoCu.

[0020] An application of hammer crusher hammers: applying hammer crusher hammers to hammer crushers to ensure normal production and extend equipment service life.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] This invention solves the problem of easy breakage in the middle of the hammer head by connecting the hammer handle and the hammer handle body with bolts or by threading the hammer handle steel plate.

[0023] The present invention inserts a steel sleeve into the shaft hole of the hammer head, which greatly reduces the centrifugal force and friction force on the shaft hole and prevents the hammer head from breaking off from the shaft hole.

[0024] This invention incorporates a larger 5×45 chamfer at the edges of the disc hole and the hammer handle hole. 0 This solved the problem of the disc tightly clamping the hammer head, making it very difficult to remove.

[0025] The present invention solves the problem of easy breakage of crusher hammers through the above measures, and avoids the crusher rotor from losing balance instantly and generating violent vibrations once the hammer breaks and falls off, which would lead to serious equipment failure. The replacement of hammers is also much easier, thus extending the service life of the hammers, reducing the amount of hammers used and maintenance time, and saving spare parts costs and construction costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the connection between the crusher hammer and the rotor shaft of the present invention;

[0027] Figure 2 This is a schematic diagram of the crusher hammer of the present invention;

[0028] Figure 3 This is a schematic diagram of the hammer handle connection hole of the present invention;

[0029] Figure 4 This is a schematic diagram of the through hole in the hammer handle of the present invention;

[0030] Figure 5 This is a schematic diagram of the arrangement of the cemented carbide blocks of the present invention. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] like Figure 1-4 As shown, a hammer crusher hammer head includes a rotor shaft 1 and a crusher hammer head 2 connected to the rotor shaft 1. The crusher hammer heads 2 are spaced apart between positioning discs 3, and the gap between the crusher hammer head 2 and the positioning disc 3 is less than 3mm. The crusher hammer head 2 includes a hammer head 4 and a hammer handle body 5 fixedly connected to the hammer head 4. The hammer handle body 5 is detachably connected to the hammer handle 6.

[0035] The end of the hammer handle 6 is fixedly provided with a connecting hole 7, which is a through hole, and a protective component 8 is provided inside the connecting hole 7.

[0036] The end of the hammer handle 6 has a connection hole 7 with a chamfered space 9 inside, and the chamfered space 9 is greater than the height of the extrusion point.

[0037] In a further preferred embodiment of the present invention, the hammer handle body 5 has a groove structure that mates with the hammer handle 6. The hammer handle body 5 and the hammer handle 6 are connected by bolts or by threads machined in the hammer handle body 5. The side of the hammer handle 6 that connects to the hammer handle body 5 is convex, and a through hole 10 is provided on the hammer handle 6. The through holes 10 are arranged in a triangular pattern. The through holes 10 on the hammer handle 6 mate with the positioning holes on the hammer handle body 5.

[0038] The end of the hammer handle body 5 has an arc-shaped structure that matches the arc-shaped structure on the hammer handle 6.

[0039] In the above embodiments, at the connection between the hammer handle body 5 and the hammer handle 6, that is, at the overlap of the hammer handle and the hammer handle body 5, three M10 mating bolts are used for connection, or threads are machined inside the steel plate for connection. The above structure can be disassembled and replaced. However, too many bolts make installation inconvenient and drilling too many holes will damage the steel plate. Ordinary bolts cannot be used because the fit gap is too large. Special mating bolts can make the steel plate and bolts make tight contact, or threaded steel plates can be used to make the steel plate and bolts make threaded contact, so as to avoid large connection gaps and excessive wear during use, which can lead to structural loosening and even breakage.

[0040] In a further preferred embodiment of the present invention, the protective component 8 is a hollow steel sleeve, which is embedded in the connecting hole 7 and fixed by a stabilizing pin.

[0041] In the above embodiment, the steel sleeve and the connecting hole are fixed with 1-2 stabilizing pins. The stabilizing pins do not need to be too large, about M4, because the shaft hole mainly bears radial force and the axial force is very small. This allows the centrifugal force generated by the hammer head during rotation to act on the steel sleeve first, and the collision friction between the hammer head shaft and the hammer head also acts on the steel sleeve first. When the centrifugal force and friction force borne by the shaft hole are transmitted to the shaft hole through the steel sleeve, the contact area is also increased. Finally, the centrifugal force and friction force borne by the shaft hole are greatly reduced, preventing the hammer head from breaking off from the shaft hole.

[0042] In a further preferred embodiment of the present invention, the chamfered space 8 is formed on both sides of the connecting hole 7, and the hole has a chamfer of 5×45 degrees. 0 The chamfered side length is 5mm. The chamfer on the hole connecting the positioning disc 3, which is opposite to the hammer handle 6 and connected to the rotor shaft 1, is 5×45°. 0 The chamfered side is 5mm long.

[0043] After about two years of use, the hammerheads wear out significantly, resulting in poor crushing performance and severe vibration. The hammerheads must be replaced. However, the gap between the hammerheads and the two discs is less than 3mm. After the crusher has been used for a long time, the disc holes and hammer handle holes are squeezed against the hammerhead shaft under centrifugal force, causing the disc holes and hammer handle holes to deform and "grow" small piles of iron. The positioning discs tightly clamp the hammerheads, making them very difficult to remove. It is necessary to use a hammer, a pry bar, or even gas welding to cut and remove them.

[0044] In the above embodiment, the edges of the connecting holes on the positioning disc and the hammer handle are machined with a larger chamfer, and the chamfer between the positioning disc and the hammer handle hole can be machined to 5×45. 0 That is, the chamfered side length is 5mm. The extra small iron pile that "grows" due to the squeezing during the operation of the positioning disc and the hammer handle hole can enter the chamfered space. The general service life of the hammer head is 2 years. Within the two-year service life, the height of the squeezed pile is about 2mm. The chamfered space is sufficient, which solves the problem that the disc tightly clamps the hammer head and makes it very difficult to remove.

[0045] In a further preferred embodiment of the present invention, the crusher hammer 2 is a composite hammer made of medium carbon steel and high chromium cast iron, and is cast using solid-liquid sand mold composite casting. The composite hammer has carbon steel 11 as the base, and hard alloy blocks 12 are distributed at intervals inside the base, and the hard alloy blocks 12 are arranged along the crusher hammer 2.

[0046] The cemented carbide block 12 includes a long alloy block 13 and short alloy blocks 14. The length of the long alloy block 13 is five times the length of the short alloy block 14. The short alloy blocks 14 are not spaced between the long alloy blocks 13. The medium carbon steel is 45# steel, and the cemented carbide block is made of 4Cr22MoCu.

[0047] In the above embodiments, cemented carbide is embedded in a tough matrix, resulting in a composite hammerhead that is soft on the outside and hard on the inside, exhibiting high toughness and hardness. The composite hammerhead features alternating layers of soft and hard material, and the hammerhead shank is made of 45" carbon steel, providing excellent impact toughness. During operation, the hammerhead will not break, ensuring safe production. The high hardness of the working part of the composite hammerhead provides excellent wear resistance, increasing the hammerhead's service life and reducing production costs.

[0048] An application of hammer crusher hammers: applying hammer crusher hammers to hammer crushers to ensure normal production and extend equipment service life.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hammer crusher hammerhead, comprising a rotor shaft (1) and crusher hammerheads (2) connected to the rotor shaft (1), wherein the crusher hammerheads (2) are spaced apart between positioning discs (3), and the gap between the crusher hammerheads (2) and the positioning discs (3) is less than 3 mm, characterized in that: The crusher hammer (2) includes a hammer (4) and a hammer handle body (5) fixedly connected to the hammer (4), and the hammer handle body (5) is detachably connected to the hammer handle (6). The hammer handle (6) has a fixed connection hole (7) at its end. The connection hole (7) is a through hole and a protective part (8) is provided inside the connection hole (7). The end of the hammer handle (6) has a connection hole (7) with a chamfered space (9) inside, and the chamfered space (9) is greater than the height of the pile.

2. The hammer head of the hammer crusher according to claim 1, characterized in that: The hammer handle body (5) has a groove structure that mates with the hammer handle (6). The hammer handle body (5) and the hammer handle (6) are connected by bolts or by threading through the hammer handle body (5).

3. The hammer head of the hammer crusher according to claim 2, characterized in that: The hammer handle (6) is convex on the side connected to the hammer handle body (5), and a through hole (10) is provided on the hammer handle (6), and the through hole (10) is arranged in a triangular pattern.

4. The hammer head of the hammer crusher according to claim 3, characterized in that: The protective component (8) is a hollow steel sleeve, which is embedded in the connecting hole (7) and fixed by a stabilizing pin.

5. The hammer head of the hammer crusher according to claim 4, characterized in that: The chamfered space (8) is formed on both sides of the connecting hole (7), and the hole has a chamfer of 5×45 degrees. 0 The chamfered edge is 5mm long.

6. The hammer head of the hammer crusher according to claim 5, characterized in that: The positioning disc (3) opposite to the hammer handle (6) has a 5×45 chamfer on the hole connecting to the rotor shaft (1). 0 The chamfered edge is 5mm long.

7. The hammer head of the hammer crusher according to claim 6, characterized in that: The crusher hammer (2) is a composite hammer made of medium carbon steel and high chromium cast iron. It is made of solid-liquid sand casting. The composite hammer is based on carbon steel (11), and hard alloy blocks (12) are distributed at intervals inside the base. The hard alloy blocks (12) are arranged along the crusher hammer (2). The cemented carbide block (12) includes a long alloy block (13) and a short alloy block (14), wherein the length of the long alloy block (13) is five times the length of the short alloy block (14).

8. The hammer head of the hammer crusher according to claim 7, characterized in that: The short alloy blocks (14) are not spaced between the long alloy blocks (13).

9. The hammer head of the hammer crusher according to claim 7, characterized in that: The medium carbon steel is 45# steel, and the cemented carbide block is made of 4Cr22MoCu.

10. An application of the hammer head of a hammer crusher according to claim 9, characterized in that: Applying hammer heads to hammer crushers ensures normal production and extends equipment lifespan.

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