A long-life sprocket with replaceable chain pockets

Abstract

The utility model relates to chain wheel technical field, and specifically is a kind of replaceable chain nest longevous chain wheel, including sprocket body, the sprocket body is equipped with multiple bosses, the boss is equipped with clamping block, the clamping block is clamped between gear block, the gear block is abutted between one end and boss, fastening bolt is penetrated in the clamping block, the fastening bolt is threadedly connected between adjacent gear block, two chain nests are equipped on the gear block, the gear block is fixedly connected with link key, the boss is equipped with keyway, and the link key is clamped between keyway;In use, gear block can be replaced according to chain nest wear condition, and entire sprocket shaft group or sprocket piece does not need to be replaced, not only can guarantee the mechanical strength and stress condition of chain wheel, but also convenient to replace, can be replaced in pit, single-piece weight is small, substantially improve maintenance efficiency, reduce labor intensity, reduce pit operation safety risk.

Description

Technical Field

[0001] This utility model relates to a sprocket, specifically a replaceable sprocket with a long service life, belonging to the field of sprocket technology. Background Technology

[0002] Scraper conveyors are the most important transportation equipment in fully mechanized mining faces. Among them, the sprocket shaft assembly is a key component of the scraper conveyor, driving the scraper chain and directly affecting material conveying and coal output. Its good performance can ensure the stable operation of the scraper chain. The sprocket is the most important and easily worn part of the sprocket shaft assembly, and its service life is directly related to the service life of the entire sprocket shaft assembly. Due to the tight production schedule, heavy workload, and harsh conditions in coal mines, conventional design structures can no longer meet the needs of relevant customers. Moreover, with the continuous improvement of customer needs and expectations, there are higher requirements for the high reliability, high stability, and long service life of the sprocket shaft assembly.

[0003] However, the current main solution is to replace it after it wears out. According to research, the sprocket shaft assembly in China is mainly an integral design or a split design for the sprocket body. The main disadvantages are that the sprocket shaft assembly is replaced as a whole or the split sprocket body is replaced. The main disadvantages are that it is heavy and requires extensive disassembly, which cannot meet the concept of quick replacement, shortened maintenance time and high efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a replaceable, high-life sprocket with a replaceable chain socket. During use, the toothed blocks can be replaced according to the wear condition of the chain socket, without replacing the entire sprocket shaft assembly or sprocket plates. This not only ensures the mechanical strength and stress condition of the sprocket, but also makes replacement convenient and can be carried out underground. The individual parts are lightweight, which greatly improves maintenance efficiency, reduces labor intensity, and lowers the safety risks of underground operations.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a replaceable chain socket high-life sprocket, comprising a sprocket body, the sprocket body having multiple bosses, each boss having a locking block that engages with a toothed block, one end of the toothed block abutting against the boss, a fastening bolt passing through the locking block, the fastening bolt being threadedly connected to an adjacent toothed block, the toothed block having two chain sockets, a connecting key fixedly connected to the toothed block, a keyway on the boss, and the connecting key engaging with the keyway.

[0006] Preferably, the boss and the sprocket body are an integral structure, the locking block and the boss are an integral structure, and the toothed block and the connecting key are an integral structure.

[0007] Preferably, the toothed block is provided with a slot, the slot engages with an adjacent block, and the cross-section of one end of the slot is trapezoidal.

[0008] Preferably, the clamping block is provided with a groove, one end of the fastening bolt is located inside the groove, and the cross-section of the groove has a convex-shaped structure.

[0009] Preferably, the two chain sockets are symmetrically distributed about the middle of the tooth-shaped block, and the plurality of tooth-shaped blocks are distributed in a circumferential array about the center of the sprocket body.

[0010] Preferably, the cross-section of the clamping block has a trapezoidal structure, and the fastening bolt is a hexagon socket head flat-head bolt.

[0011] Preferably, the sprocket body is made of common 40CrNiMo, and the tooth-shaped block is made of reinforced 40CrNiMoA.

[0012] Preferably, the edge of the tooth-shaped block is flush with the edge of the clamping block, and the edge of the tooth-shaped block is flush with the edge of the boss.

[0013] Beneficial effects of the present utility model are as follows: in use, the tooth-shaped block can be replaced according to the wear condition of the chain socket, and it is not necessary to replace the entire sprocket shaft group or sprocket sheet, which not only ensures the mechanical strength and stress condition of the sprocket, but also is convenient for replacement, can be replaced underground, has small single-piece weight, greatly improves maintenance efficiency, reduces labor intensity, lowers safety risks and reduces replacement cost (the single replacement cost is only about 20% of that of the overall overhaul of the sprocket shaft group). The tooth-shaped block and the sprocket body are connected and stressed mainly at three positions, namely the conical surface between the clamping block and the tooth-shaped block, the positioning connection between the connecting key and the key slot, and the fastening connection by the fastening bolt. During the entire movement process of the sprocket sheet, the bolts at the replaceable tooth-shaped block part only play an auxiliary fixing role. After the sprocket sheet rotates past the vertical position, since the scraper chain has entered the chain socket, the position of the replaceable tooth-shaped block part becomes more stable under the action of the chain relying on the conical surface connection and the key slot positioning connection, and there is no need to worry about the tooth-shaped block loosening or falling off. The stress and load of the related conical surface connection and key slot positioning connection have all been verified by ANSYS finite element analysis software, and meet the requirement of the maximum breaking force load of the chain. Description of Drawings Figure 1 is an overall structural schematic diagram of the present utility model; Figure 2 is a connection structural schematic diagram of the boss and the clamping block of the present utility model; Figure 3 is a connection structural schematic diagram of the tooth-shaped block and the connecting key of the present utility model; Figure 4 is a connection structural schematic diagram of the fastening bolt and the tooth-shaped block of the present utility model.

[0014] In the figure: 1, sprocket body; 2, tooth-shaped block; 3, fastening bolt; 4, chain socket; 5, connecting key; 6, key groove; 7, clamping slot; 8, boss; 9, clamping block; 10, groove. DETAILED DESCRIPTION OF EMBODIMENTS

[0015] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , as shown in the drawings, a high-life sprocket with replaceable chain sockets comprises a sprocket body 1, wherein a plurality of bosses 8 are arranged on the sprocket body 1, a clamping block 9 is arranged on the boss 8, the clamping block 9 is clamped and connected with a tooth-shaped block 2, one end of the tooth-shaped block 2 is in conflict with the boss 8, a fastening bolt 3 penetrates through the clamping block 9, the fastening bolt 3 is in threaded connection with an adjacent tooth-shaped block 2, two chain sockets 4 are arranged on the tooth-shaped block 2, a connecting key 5 is fixedly connected to the tooth-shaped block 2, a key groove 6 is arranged on the boss 8, the connecting key 5 is clamped and matched with the key groove 6, the boss 8 and the sprocket body 1 are of an integrated structure, the clamping block 9 and the boss 8 are of an integrated structure, and the tooth-shaped block 2 and the connecting key 5 are of an integrated structure.

[0017] As a technical optimization scheme of the present utility model, as shown in Figure 1 and Figure 3 , a clamping slot 7 is arranged on the tooth-shaped block 2, the clamping slot 7 is clamped and matched with an adjacent clamping block 9, and the cross-section of one end of the clamping slot 7 is of a trapezoidal structure. Therefore, after the tooth-shaped block 2 is clamped with the clamping slot 7, the tapered surface connection between the tooth-shaped block 2 and the sprocket body 1 can be realized, thereby improving the connection stability, and can play a guiding role when the tooth-shaped block 2 is clamped with the clamping slot 7.

[0018] As a technical optimization scheme of the present utility model, as shown in Figure 1 , Figure 2 and Figure 4 , a groove 10 is arranged on the clamping block 9, one end of the fastening bolt 3 is located inside the groove 10, and the cross-section of the groove 10 is of a "convex" shaped structure, so that one end of the fastening bolt 3 can be accommodated inside the groove 10.

[0019] As a technical optimization scheme of the present utility model, as shown in Figure 1 , Figure 2 and Figure 4 As shown, the two chain sockets 4 are symmetrically distributed about the middle of the toothed block 2, and the multiple toothed blocks 2 are arranged in a circular array about the center of the sprocket body 1. The cross-section of the locking block 9 is trapezoidal, and the fastening bolt 3 is an internal hexagonal flat head bolt. Therefore, the toothed block 2 can be reinforced by the fastening bolt 3.

[0020] As a technical optimization solution of this utility model, such as Figure 1 As shown, the sprocket body 1 is made of ordinary 40CrNiMo material, and the toothed block 2 is made of reinforced 40CrNiMoA material, which can improve the wear resistance of the toothed block 2.

[0021] As a technical optimization solution of this utility model, such as Figure 1 As shown, the edge of the toothed block 2 is flush with the edge of the locking block 9, and the edge of the toothed block 2 is flush with the edge of the boss 8, thus improving the overall aesthetics of the sprocket.

[0022] In use, the toothed block 2 is mainly manufactured through the following processes: forging blank - normalizing - rough machining - quenching and tempering - semi-finishing - assembly - chain nest machining - chain nest quenching - tempering - disassembly - carburizing - finish machining - assembly. The sprocket body 1 and the toothed block 2 are processed separately and manufactured according to optimal fit tolerances. Finally, they are assembled as a whole, ensuring normal disassembly and replacement. The sprocket body 1 is made of ordinary 40CrNiMo material, and the process involves forging, rough machining of the shape, quenching and tempering, and finish milling of the assembly mating parts. The toothed block 2 is made of reinforced 40CrNiMoA material, forged, normalized, and rough machined. The process of turning, milling the chain recess, and carburizing and quenching results in a sprocket structure with the following advantages: high wear resistance in the chain recess 4 area; mass production is possible with appropriate molds; and raw material costs can be reduced by 40% compared to an integral sprocket structure. The toothed block 2 undergoes quenching followed by carburizing, achieving a hardness of HRC58-62 within the 3mm carburized layer and HRC50-55 within the 3-25mm outer layer. It exhibits strong hardenability, a small hardness gradient, and high wear resistance in the chain recess 4 area. A certain number of toothed block 2 parts are included at the factory, allowing for replacement of the toothed blocks 2 based on chain recess wear during use, eliminating the need for complete replacement. Replacing individual sprocket shaft assemblies or sprocket segments not only ensures the mechanical strength and stress condition of the sprocket, but also facilitates replacement. Replacement can be performed underground, eliminating the need for large-scale disassembly, hoisting, and other major overhauls, thus reducing safety risks. The small weight of individual components significantly improves maintenance efficiency, reduces labor intensity, lowers safety risks, and reduces replacement costs (the cost of a single replacement is only about 20% of a complete overhaul of the sprocket shaft assembly). The toothed block 2 and the sprocket body 1 are mainly connected and stressed at three points: the conical surface between the locking block 9 and the toothed block 2, the positioning connection between the connecting key 5 and the keyway 6, and the fastening connection of the fastening bolts 3. Throughout the entire movement of the sprocket, the fastening bolts 3 of the replaceable toothed block part only play an auxiliary fixing role. After the sprocket rotates to the vertical position, since the scraper chain has entered the chain socket 4, the replaceable toothed block 2 part is more stable under the action of the chain due to the conical surface connection and keyway positioning connection. There is no need to worry about the toothed block 2 loosening or falling off. The force and load of the relevant conical surface connection and keyway positioning connection have been verified by ANSYS finite element analysis software and meet the maximum breaking force load requirements of the chain. Therefore, it is not necessary to choose a larger specification for the fastening bolts 3. It is only necessary to ensure that the bolts have a certain anti-loosening effect.

[0023] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims. 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 long-life sprocket with replaceable chain pockets, comprising a sprocket body (1), characterized in that: A plurality of bosses (8) are provided on the sprocket body (1), a clamping block (9) is provided on the boss (8), the clamping block (9) is clamped with the tooth-shaped block (2), one end of the tooth-shaped block (2) abuts against the boss (8), a fastening bolt (3) is penetrated through the clamping block (9), the fastening bolt (3) is in threaded connection with the adjacent tooth-shaped block (2), two chain sockets (4) are provided on the tooth-shaped block (2), an connecting key (5) is fixedly connected to the tooth-shaped block (2), a key slot (6) is provided on the boss (8), and the connecting key (5) is clamped with the key slot (6).

2. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: The boss (8) and the sprocket body (1) are of an integrated structure, the clamping block (9) and the boss (8) are of an integrated structure, and the tooth-shaped block (2) and the connecting key (5) are of an integrated structure.

3. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: A clamping groove (7) is provided on the tooth-shaped block (2), the clamping groove (7) is clamped with the adjacent clamping block (9), and the cross-section at one end of the clamping groove (7) is a trapezoidal structure.

4. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: A groove (10) is provided on the clamping block (9), one end of the fastening bolt (3) is located inside the groove (10), and the cross-section of the groove (10) is a convex-shaped structure.

5. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: The two chain sockets (4) are symmetrically distributed about the middle part of the tooth-shaped block (2), and the plurality of tooth-shaped blocks (2) are distributed in a circumferential array about the center of the sprocket body (1).

6. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: The cross-section of the clamping block (9) is a trapezoidal structure, and the fastening bolt (3) is a hexagon socket head flat bolt.

7. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: The sprocket body (1) is made of common 40CrNiMo, and the tooth-shaped block (2) is made of reinforced 40CrNiMoA.

8. A high life expectancy sprocket with replaceable chain pockets according to claim 1, characterized in that: The edge of the tooth-shaped block (2) is flush with the edge of the clamping block (9), and the edge of the tooth-shaped block (2) is flush with the edge of the boss (8).

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