A fixing structure of a rotor disc

Abstract

The utility model discloses a fixed structure of rotor disc, sandstone aggregate crusher, sand making machine, including the axle, at least two rotor disc bodies and with the corresponding expansion sleeve of rotor disc body one to one, rotor disc body is in order with the axle's axial direction is set in axle, and the adjacent side of adjacent two rotor disc bodies mutually is pasted, and the hole of each rotor disc body and the outer circle between axle all are provided with a expansion sleeve, and expansion sleeve is used for with corresponding rotor disc body detachably fixed on axle, and the periphery of rotor disc body is provided with a plurality of plate hammer mounting surface, and plate hammer mounting surface is used for installing plate hammer, and all rotor disc body's plate hammer mounting surface is located in the same plane.

Description

Technical Field

[0001] This utility model belongs to the technical field of sand and gravel aggregate crushers and sand making machines, and particularly relates to a rotor disc fixing structure. Background Technology

[0002] In the field of sand and gravel aggregate production, heavy impact crushers are key equipment for crushing large materials. The stability of their rotor discs directly affects the crushing efficiency, service life and operational safety of the equipment.

[0003] Currently, there are two main methods for fixing the rotor discs in heavy-duty impact crushers: 1. Ordinary key connection: This method uses a key to engage with the shaft and keyways on the rotor disc. However, when processing materials with large feed particle sizes and strong impact on the rotor (such as large ore in primary crushing), the keyways are easily damaged under the enormous impact force, leading to loosening or even detachment between the rotor disc and the shaft, seriously affecting the normal operation of the equipment and increasing maintenance costs and downtime. 2. Two-end expansion sleeve fixing: This method welds multiple rotor discs onto a cylinder and then fixes them to the shaft using expansion sleeves at both ends of the cylinder. For processing small-particle materials, this method can meet basic fixing requirements, but when used in primary crushing to process large materials, the tension of the two-end expansion sleeves is limited due to long-term exposure to high-frequency, high-intensity impact loads, making them prone to fatigue loosening. This cannot guarantee the long-term stable operation of the rotor disc and also poses a risk of equipment failure.

[0004] Furthermore, both of the above-mentioned fixing methods share a common drawback: due to limitations in machining precision, the keyways of each rotor disc in a conventional key connection are difficult to make coplanar; similarly, in the case of end-tightening sleeve fixing, it is also difficult to ensure that the mating surfaces of each rotor disc welded to the cylinder are coplanar. This results in the hammer not fitting properly against the rotor disc mating surface, leaving gaps, which further exacerbates the damage to the rotor disc and hammer caused by material impact, shortening the equipment's service life.

[0005] Therefore, there is an urgent need for a heavy-duty impact crusher disc fixing structure that can improve the rotor disc fixing tension and ensure the coplanarity of the mating surfaces, thereby adapting to the crushing conditions of large materials and improving the stability and service life of the equipment. Utility Model Content

[0006] The purpose of this invention is to provide a rotor disk fixing structure to solve the problems mentioned in the background art.

[0007] To solve the above problems, this utility model provides the following technical solution:

[0008] A rotor disk fixing structure includes a main shaft, at least two rotor disk bodies, and expansion sleeves corresponding to each rotor disk body. The rotor disk bodies are sequentially sleeved on the main shaft along its axial direction, with adjacent sides of two adjacent rotor disk bodies abutting each other. An expansion sleeve is provided between the inner hole of each rotor disk body and the outer circle of the main shaft, and the expansion sleeve is used to detachably fix the corresponding rotor disk body to the main shaft. Multiple hammer mounting surfaces are provided on the outer periphery of the rotor disk body, and the hammer mounting surfaces are used to mount hammers, with all the hammer mounting surfaces of the rotor disk bodies located on the same plane.

[0009] Preferably, the expansion sleeve includes an inner ring, an outer ring, and a wedge-shaped surface structure disposed between the inner ring and the outer ring. The inner ring is sleeved on the main shaft, and the outer ring is embedded in the inner hole of the rotor disc. By tightening the connecting bolts on the expansion sleeve, the inner ring and the outer ring move relative to each other along the wedge-shaped surface, thereby achieving an interference fit fixation between the inner ring and the main shaft, and between the outer ring and the rotor disc.

[0010] Preferably, the inner wall of the rotor disc is provided with an annular groove for accommodating the outer ring of the expansion sleeve, and the depth of the annular groove is adapted to the axial length of the outer ring.

[0011] Preferably, positioning protrusions and positioning grooves are respectively provided on the contacting sides of two adjacent rotor discs. The positioning protrusions and positioning grooves are adapted to restrict the relative rotation between adjacent rotor discs.

[0012] Preferably, the positioning protrusion and the positioning groove are located on different sides of the rotor disc. The positioning protrusion is an annular protrusion arranged along the circumferential direction of the side of the rotor disc, and the positioning groove is an annular groove arranged along the circumferential direction of the side of the rotor disc. The cross-sectional shape of the annular protrusion is the same as that of the annular groove, which is rectangular, trapezoidal or triangular.

[0013] Preferably, the rotor disc is made of high-strength alloy steel and its surface is hardened.

[0014] The beneficial effects of this utility model are: strong tension and high stability: by configuring a shrinking sleeve for each rotor disc, the traditional single-point shrinking at both ends is changed to multi-point shrinking along the axial direction, which greatly increases the overall tension between the rotor disc and the shaft, effectively resists the high-frequency and high-intensity impact load generated when large materials are crushed, avoids fatigue loosening of the shrinking sleeve, significantly improves the fixing stability of the rotor disc, and extends the service life of the equipment.

[0015] Since each rotor disc is fixed by an independent expansion sleeve, the hammer mounting surface of each rotor disc can be finely adjusted individually during installation, unaffected by the processing errors of other rotor discs. This easily ensures that the hammer mounting surfaces of all rotor discs are on the same plane, allowing the hammers to fit snugly and eliminating gaps, thus preventing excessive local damage to the hammers and rotor discs caused by material impact.

[0016] Easy to install and remove, low maintenance cost: The expansion sleeve adopts a detachable fixing structure. When a single rotor disc or expansion sleeve is damaged, it is not necessary to disassemble the entire rotor assembly. Only the corresponding expansion sleeve needs to be removed to replace the damaged part, which reduces the difficulty of maintenance, reduces downtime, and saves maintenance costs.

[0017] By setting a matching structure of positioning protrusions and positioning grooves, the relative rotation between adjacent rotor discs and between the rotor discs and the shaft is effectively restricted, further improving the overall torsional resistance of the rotor assembly and ensuring stable operation of the equipment under high-speed operation and strong impact conditions. Attached Figure Description

[0018] Figure 1 This is a front view of the heavy-duty counter-attack disc fixing structure in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the mounting plate hammer structure of the rotor disk in an embodiment of the present invention;

[0020] Figure 3 This is a front view of the rotor disk in an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of the rotor disk body in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the shaft structure according to an embodiment of the present invention;

[0023] Figure 6 This is a front view of the expansion sleeve in an embodiment of the present invention;

[0024] Figure 7 This is a side view of the expansion sleeve in an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] Please see Figure 1 - Figure 7 This invention provides a rotor disk fixing structure, including a main shaft 1, at least two rotor disk bodies 2, and expansion sleeves 3 corresponding to each rotor disk body 2. The rotor disk bodies 2 are sequentially sleeved onto the main shaft 1 along its axial direction, with adjacent sides of two adjacent rotor disk bodies 2 abutting against each other. An expansion sleeve 3 is provided between the inner hole of each rotor disk body 2 and the outer edge of the main shaft 1, and the expansion sleeve 3 is used to detachably fix the corresponding rotor disk body 2 to the main shaft 1. Multiple hammer mounting surfaces 21 are provided on the outer periphery of the rotor disk body 2, and the hammer mounting surfaces 21 are used to mount hammers, with all the hammer mounting surfaces 21 of the rotor disk bodies 2 located on the same plane. The expansion sleeve 3 includes an inner ring 31, an outer ring 32, and a wedge-shaped surface structure 33 disposed between the inner ring 31 and the outer ring 32. The inner ring 31 is sleeved on the main shaft 1, and the outer ring 32 is embedded in the inner hole of the rotor disc 2. By tightening the connecting bolts 34 on the expansion sleeve 3, the inner ring 31 and the outer ring 32 move relative to each other along the wedge-shaped surface, achieving an interference fit fixation between the inner ring 31 and the main shaft 1, and between the outer ring 32 and the rotor disc 2. An annular groove 22 for accommodating the outer ring 32 of the expansion sleeve 3 is formed on the inner wall of the rotor disc 2. The depth of the annular groove 22 is adapted to the axial length of the outer ring 32. The annular groove is designed to axially position the outer ring of the expansion sleeve, ensuring it is properly positioned within the rotor disc's inner bore. This prevents displacement due to axial forces during operation, guaranteeing the stability of the fit between the expansion sleeve and the rotor disc / shaft, and ultimately ensuring the reliability of the rotor disc / shaft connection. The expansion sleeve comprises an inner ring, an outer ring, and a wedge-shaped surface structure between the inner and outer rings. The inner ring is fitted onto the shaft, and the outer ring is embedded in the rotor disc's inner bore. Tightening the connecting bolts on the expansion sleeve causes the inner and outer rings to move relative to each other along the wedge-shaped surface, achieving an interference fit between the inner ring and the shaft, and between the outer ring and the rotor disc. The expansion sleeve utilizes the inclined surface principle of the wedge-shaped surface. When the connecting bolts are tightened, axial relative displacement occurs between the inner and outer rings. Due to the presence of the wedge-shaped surface, this axial displacement is converted into radial force, causing the inner ring to contract inward to grip the shaft, and the outer ring to expand outward to tighten the inner bore of the rotor disc. This creates a reliable interference fit, effectively transmitting high torque and meeting the power transmission requirements of heavy-duty impact crushers. Moreover, this method of achieving interference fit through bolt adjustment is more flexible and convenient for installation and disassembly compared to the traditional direct press-fit interference fit. It does not require large press-fit or disassembly equipment, thus reducing the requirements for operating space and equipment.

[0027] Positioning protrusions and positioning grooves are respectively provided on the mating sides of two adjacent rotor discs 2. The positioning protrusions and positioning grooves are adapted to each other to limit the relative rotation between adjacent rotor discs. The positioning protrusions and positioning grooves are located on different sides of the rotor discs. The positioning protrusions are annular protrusions arranged along the circumference of the side of the rotor disc 2, and the positioning grooves are annular grooves arranged along the circumference of the side of the rotor disc. The cross-sectional shape of the annular protrusions is consistent with the cross-sectional shape of the annular grooves, which is rectangular, trapezoidal, or triangular. Positioning protrusions and positioning grooves are respectively provided on the mating sides of two adjacent rotor discs. The positioning protrusions and positioning grooves are adapted to each other to limit the relative rotation between adjacent rotor discs. When the heavy-duty impact crusher is working, the rotor discs need to drive the hammers to rotate at high speed to impact the material, which will be subject to a large circumferential torque. The combination of positioning protrusions and grooves effectively restricts the relative circumferential rotation between adjacent rotor discs, preventing deviations in the hammer mounting surface due to circumferential movement. This ensures that the hammer mounting surfaces of all rotor discs remain on the same plane, allowing the hammers to be evenly stressed during operation, improving crushing uniformity and hammer lifespan. The positioning protrusions and grooves are located on different sides of the rotor discs. The positioning protrusions are annular protrusions along the circumference of the rotor disc side, and the positioning grooves are annular grooves along the circumference of the rotor disc side. The cross-sectional shape of the annular protrusions matches that of the annular grooves, being rectangular, trapezoidal, or triangular. Each cross-sectional shape has its own advantages. Rectangular cross-sections are relatively simple to manufacture, provide a larger contact area, and have a stronger torque transmission capacity. Trapezoidal cross-sections have a certain self-centering effect during circumferential positioning and exhibit a more reasonable stress distribution under circumferential forces. Triangular cross-sections better resist circumferential shear forces under impact loads, preventing damage to the positioning structure. The appropriate cross-sectional shape can be selected based on actual working conditions.

[0028] The rotor disc 2 is made of high-strength alloy steel, and its surface is hardened. High-strength alloy steel itself has high strength and toughness, capable of withstanding the enormous impacts and vibrations during the operation of a heavy-duty impact crusher. Surface hardening further improves the hardness and wear resistance of the rotor disc surface. Since the hammer contacts the rotor disc at the mounting surface, and the outer periphery of the rotor disc is subjected to friction from materials during operation, the hardened layer formed after surface hardening effectively resists this wear, extending the service life of the rotor disc. Simultaneously, it maintains good internal toughness, preventing the rotor disc from brittlely fractured due to excessive hardness.

[0029] The working principle of this invention is as follows: During installation, the inner ring 31 of the expansion sleeve 3 is first placed on the main shaft 1, and then the rotor disc 2 is placed on the outer ring 32 of the expansion sleeve 3, so that the outer ring 32 is embedded in the annular groove 22 of the inner hole of the rotor disc 2. Next, other rotor discs 2 are installed in sequence, so that the positioning protrusions and positioning grooves of adjacent rotor discs 2 cooperate with each other to ensure accurate circumferential positioning, and the hammer mounting surfaces 21 of all rotor discs 2 are located on the same plane. Finally, the connecting bolts 34 on the expansion sleeve 3 are tightened. Due to the wedge-shaped surface structure 33 between the inner ring 31 and the outer ring 32, under the action of the connecting bolts 34, the inner ring 31 and the outer ring 32 move relative to each other along the wedge-shaped surface, and an interference fit is generated between the inner ring 31 and the main shaft 1, and between the outer ring 32 and the rotor disc 2, thereby reliably fixing the rotor disc 2 on the main shaft 1. During disassembly, simply loosen the connecting bolts 34 on the expansion sleeve 3 to release the interference fit between the inner ring 31 and the outer ring 32, and the rotor disc 2 can be easily removed from the main shaft 1 for maintenance or replacement.

[0030] In summary, this invention achieves convenient and reliable fixing of the rotor disc to the shaft through the expansion sleeve, ensures the coplanarity of the mounting surfaces of multiple rotor disc hammers through the positioning structure, and improves the strength and wear resistance of the equipment through the material and heat treatment method of the rotor disc, making it suitable for the working requirements of heavy impact crushers.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotor disk fixing structure, characterized in that, The device includes a main shaft (1), at least two rotor discs (2), and expansion sleeves (3) corresponding to each rotor disc (2). The rotor discs (2) are sequentially sleeved on the main shaft (1) along the axial direction of the main shaft (1), and the adjacent sides of two adjacent rotor discs (2) are in contact with each other. An expansion sleeve (3) is provided between the inner hole of each rotor disc (2) and the outer circle of the main shaft (1). The expansion sleeve (3) is used to detachably fix the corresponding rotor disc (2) to the main shaft (1). Multiple hammer mounting surfaces (21) are provided on the outer periphery of the rotor disc (2). The hammer mounting surfaces (21) are used to mount hammers, and the hammer mounting surfaces (21) of all rotor discs (2) are located on the same plane.

2. The rotor disk fixing structure according to claim 1, characterized in that, The expansion sleeve (3) includes an inner ring (31), an outer ring (32), and a wedge-shaped surface structure (33) disposed between the inner ring (31) and the outer ring (32). The inner ring (31) is sleeved on the main shaft (1), and the outer ring (32) is embedded in the inner hole of the rotor disc (2). By tightening the connecting bolts (34) on the expansion sleeve (3), the inner ring (31) and the outer ring (32) move relative to each other along the wedge-shaped surface, thereby achieving an interference fit fixation between the inner ring (31) and the main shaft (1), and between the outer ring (32) and the rotor disc (2).

3. The rotor disk fixing structure according to claim 1, characterized in that, The inner wall of the rotor disc (2) is provided with an annular groove (22) for accommodating the outer ring (32) of the expansion sleeve (3), and the depth of the annular groove (22) is adapted to the axial length of the outer ring (32).

4. The rotor disk fixing structure according to claim 1, characterized in that, Positioning protrusions and positioning grooves are respectively provided on the mating sides of two adjacent rotor discs (2). The positioning protrusions and positioning grooves are adapted to restrict the relative rotation between adjacent rotor discs.

5. The rotor disk fixing structure according to claim 4, characterized in that, The positioning protrusion and the positioning groove are located on different sides of the rotor disk body. The positioning protrusion is an annular protrusion arranged along the circumferential direction of the side of the rotor disk body (2). The positioning groove is an annular groove arranged along the circumferential direction of the side of the rotor disk body. The cross-sectional shape of the annular protrusion is consistent with the cross-sectional shape of the annular groove, which is rectangular, trapezoidal or triangular.

6. The rotor disk fixing structure according to claim 1, characterized in that, The rotor disc (2) is made of high-strength alloy steel and its surface is hardened.

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