Upper and lower split type chain wheel shaft set and manufacturing method thereof

Abstract

The invention relates to the technical field of coal mine mechanical equipment, in particular to an up-down split type chain wheel shaft set and a manufacturing method thereof.The up-down split type chain wheel shaft set is internally provided with a chain wheel assembly and two bearing seat assemblies of the same structure, and the two bearing seat assemblies are installed at the two ends of the chain wheel assembly respectively; each bearing seat assembly comprises an upper half sleeve and a lower half sleeve, the inner side of each upper half sleeve and the inner side of each lower half sleeve are used for being arranged on a shaft in a sleeving mode, and the bottom end of each upper half sleeve is detachably installed at the top end of the corresponding lower half sleeve, so that a complete bearing seat is formed on the shaft of the chain wheel shaft set; therefore, when the bearing seat is replaced, the bearing seat can be detached from the shaft for replacement only by separating the upper half sleeve from the lower half sleeve, the bearing seat of the chain wheel shaft group can be replaced without detaching the chain wheel shaft group from the scraper conveyor, and the maintenance efficiency of the chain wheel shaft group is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine mechanical equipment, and particularly to an upper and lower split type sprocket shaft group and a manufacturing method thereof. Background Art

[0002] In fully-mechanized coal mining equipment, a scraper conveyor is the main transportation equipment in a coal mine, and a sprocket shaft group is a transmission component of the scraper conveyor. Its performance determines the reliability of the scraper conveyor. The sprocket shaft group includes a shaft, a sprocket, bearings, a bearing seat, etc. The power is first transmitted to the sprocket through the shaft, and then the scraper chain is driven by the sprocket for transmission. During the operation of the scraper conveyor, since the sprocket needs to bear the alternating loads of the scraper chain and the coal mine, the sprocket is relatively easy to be damaged. When replacing the sprocket of the existing sprocket shaft group, it is necessary to first invert the shaft, and then remove the connections such as the bearings and the bearing seat before the sprocket can be replaced, which reduces the efficiency of sprocket replacement.

[0003] To solve the above technical problems, the technical solution announced in the Chinese utility model patent with the patent application number CN201520445851.7 is a quick-disassembly type sprocket shaft group for a scraper conveyor. It includes a shaft, on which a bearing seat and bearings are installed, and a sprocket is also installed on the shaft. The feature is that: the sprocket is composed of an upper half sprocket and a lower half sprocket bisected along its axis, and both the upper half sprocket and the lower half sprocket are detachably installed on the shaft through fasteners. The quick-disassembly type sprocket shaft group of the present invention can quickly replace the vulnerable sprocket, has a compact structure, and is therefore more suitable for use under the condition of a small underground space. The quick-disassembly type sprocket shaft group is installed in the headstock and the tailstock body. After one installation, the bearing seat and the shaft of the power unit and the sprocket shaft group no longer need to be disassembled. When the sprocket needs to be replaced, the mating bolts are removed, and then the sprocket can be replaced, effectively reducing the maintenance intensity and improving the efficiency. It is more suitable for the environment of a small underground space and a high maintenance intensity in a coal mine.

[0004] However, the following technical problems exist in the above existing technology: During the operation of the scraper conveyor underground, due to the harsh underground environment, the bearing seat of the sprocket shaft group is also worn during the operation of the scraper conveyor, making the operation of the scraper conveyor unstable, affecting the transportation efficiency of the scraper conveyor, and seriously may lead to the occurrence of production accidents. Therefore, it is necessary to timely replace the damaged bearing seat. When replacing the bearing seat of the above quick-disassembly type sprocket for a scraper conveyor, it is necessary to first remove the sprocket shaft group from the scraper conveyor before the bearing seat can be replaced, which reduces the maintenance efficiency of the sprocket shaft group. Summary of the Invention

[0005] In view of this, it is necessary to provide an upper and lower split type sprocket shaft group and a manufacturing method thereof, which can replace the bearing seat of the sprocket shaft group without removing the sprocket shaft group from the scraper conveyor, and improve the maintenance efficiency of the sprocket shaft group.

[0006] In a first aspect, the present invention provides an upper and lower split sprocket shaft group, which includes a sprocket assembly and two bearing seat assemblies with the same structure. The two bearing seat assemblies are respectively installed at both ends of the sprocket assembly. Each bearing seat assembly includes an upper half sleeve and a lower half sleeve. The inner sides of the upper half sleeve and the lower half sleeve are both used for sleeving on the shaft. The bottom end of the upper half sleeve is detachably installed at the top end of the lower half sleeve to form a complete bearing seat on the shaft of the sprocket shaft group.

[0007] Preferably, the sprocket assembly includes an upper sprocket and a lower sprocket. The inner sides of the upper sprocket and the lower sprocket are both used for sleeving on the shaft of the sprocket shaft group. The bottom end of the upper sprocket is detachably installed at the top end of the lower sprocket to form a complete sprocket on the shaft.

[0008] Preferably, the sprocket assembly further includes two fixing plates. Two upper pressing plates are symmetrically installed at the bottom end of the upper sprocket, and two lower pressing plates are symmetrically installed at the top end of the lower sprocket. Each upper pressing plate is provided with a connecting groove and a first fixing hole, and each lower pressing plate is provided with a connecting protrusion and a second fixing hole. Each upper pressing plate and the lower pressing plate are fixedly connected by inserting the connecting groove and the connecting protrusion to connect the upper sprocket and the lower sprocket. Each fixing plate covers the upper pressing plate and the lower pressing plate, and both ends are respectively bolted to the first fixing hole and the second fixing hole on the same side to fix the upper sprocket and the lower sprocket.

[0009] Preferably, a plurality of bolt holes are formed on each of the upper half sleeve and the lower half sleeve to fixedly connect the upper half sleeve and the lower half sleeve to the shaft of the sprocket shaft group by means of bolt connection to form a complete bearing seat.

[0010] Preferably, each of the upper half sleeve and the lower half sleeve is provided with a first positioning groove and a first positioning platform. Second positioning grooves and second positioning platforms are formed on the inner sides of both ends of the upper sprocket and the lower sprocket. The first positioning groove is used for engaging with the second positioning platform, and the first positioning platform is used for engaging with the second positioning groove to engage the two upper half sleeves at both ends of the upper sprocket to form a first upper half sprocket shaft group; engage the two lower half sleeves at both ends of the lower sprocket to form a first lower half sprocket shaft group; and fix the first upper half sprocket shaft group and the first lower half sprocket shaft group to the shaft of the sprocket shaft group by bolt-connecting each upper half sleeve and the lower half sleeve to form a complete sprocket shaft group.

[0011] Preferably, the two upper half sleeves are fixed to both ends of the upper sprocket by means of thermal welding to form a second upper half sprocket shaft group; the two lower half sleeves are fixed to both ends of the lower sprocket by means of thermal welding to form a second lower half sprocket shaft group; and the second upper half sprocket shaft group and the second lower half sprocket shaft group are fixed to the shaft of the sprocket shaft group by bolt-connecting each upper half sleeve and the lower half sleeve to form a complete sprocket shaft group.

[0012] In a second aspect, the present invention provides a manufacturing method for the upper and lower split sprocket shaft group as described in the first aspect, including a manufacturing method for the bearing seat assembly, a manufacturing method for the sprocket assembly, and a processing method for the sprocket shaft group. Among them, the manufacturing methods for the bearing seat and the sprocket assembly are both realized based on metal cutting processes; the processing method for the sprocket shaft group is used to assemble and process the bearing seat assembly manufactured based on the manufacturing method for the bearing seat and the sprocket assembly manufactured based on the manufacturing method for the sprocket assembly by means of a hot welding process, a metal cutting process, and a heat treatment process.

[0013] Preferably, the manufacturing method for the bearing seat assembly includes the following steps: S101, processing the raw material into a first blank with a corresponding shape; S102, milling a first port surface on the first blank; S103, based on the first port surface, milling a bolt groove, drilling bolt holes, processing it into an upper half sleeve, and processing a lower half sleeve according to the same steps; S104, aligning the end faces of the upper half sleeve and the lower half sleeve and assembling them into a bearing seat, and fixedly connecting them with bolts; S105, performing a rough turning operation on the end face and a rough boring operation on the inner hole of the bearing seat; S106, milling a groove straight platform and turning a first positioning groove and a first positioning platform; S107, milling a first weld bead based on the mating surface; S108, disassembling the bearing seat into an upper half sleeve and a lower half sleeve.

[0014] Preferably, the manufacturing method for the sprocket assembly includes the following steps: S201, processing the raw material into a second blank with a corresponding shape; S202, milling a second port surface on the second blank; S203, based on the second port surface, milling a pressing plate groove; S204, installing the upper pressing plate into the pressing plate groove to form an upper sprocket, and installing the lower pressing plate into the pressing plate groove to form a lower sprocket; S205, inserting and connecting the upper sprocket and the lower sprocket to form a sprocket, and fixing it with a fixing plate; S206, performing a rough turning operation on the end face, a rough boring operation on the inner hole, and a rough turning operation on the tooth groove of the sprocket; S207, flame gouging the tooth profile on the sprocket and performing a quenching and tempering operation on the sprocket; S208, performing a semi-finish turning operation on the sprocket; S209, milling an end face and turning a second positioning groove and a second positioning platform; S210, disassembling the sprocket into an upper sprocket and a lower sprocket; S211: Based on the end face, mill the second weld bead on the upper sprocket and the lower sprocket.

[0015] Preferably, the manufacturing method of the sprocket shaft group includes the following steps: S301: Use hot-dip metal to thermally weld two upper half sleeves to both sides of the upper sprocket to form an upper half sprocket shaft group, and use hot-dip metal to thermally weld two lower half sleeves to both sides of the lower sprocket to form a lower half sprocket shaft group; S302: Combine the upper half sprocket shaft group and the lower half sprocket shaft group into a complete sprocket shaft group; S303: Perform the boring inner hole process and the turning outer circle process on the sprocket shaft group; S304: Mill the chain nests and tooth profile wheels on the sprocket shaft group; S305: Perform heat treatment quenching on the sprocket shaft group; S306: Disassemble the sprocket shaft group into the upper half sprocket shaft group and the lower half sprocket shaft group; S307: Mill the keycaps and process and inspect the threaded holes on the upper half sprocket shaft group and the lower half sprocket shaft group respectively; S308: Heat the thermal welding parts of the upper half sprocket shaft group and the lower half sprocket shaft group to make the hot-dip metal flow out in a liquid state, and disassemble the upper half sprocket shaft group and the lower half sprocket shaft group.

[0016] In the above-mentioned upper and lower split-type sprocket shaft group, there are a sprocket assembly and two bearing seat assemblies with the same structure. The two bearing seat assemblies are respectively installed at both ends of the sprocket assembly. Each bearing seat assembly includes an upper half sleeve and a lower half sleeve. The inner sides of the upper half sleeve and the lower half sleeve are both used for sleeving on the shaft. The bottom end of the upper half sleeve is detachably installed at the top end of the lower half sleeve to form a complete bearing seat on the shaft of the sprocket shaft group. In this way, when replacing the bearing seat, only need to separate the upper half sleeve from the lower half sleeve, then the bearing seat can be removed from the shaft for replacement without removing the sprocket shaft group from the scraper conveyor, which improves the maintenance efficiency of the sprocket shaft group. Description of the Drawings

[0017] Figure 1 is a cross-sectional view of the upper and lower split-type sprocket shaft group of the present application.

[0018] Figure 2 is a side view of the sprocket assembly of the present application when equipped with a fixing plate.

[0019] Figure 3 is a side view of the sprocket assembly of the present application when not equipped with a fixing plate.

[0020] Figure 4 is an oblique overhead view of the upper pressing plate of the present application.

[0021] Figure 5It is an oblique overhead view of the lower pressing plate of the present application.

[0022] Figure 6 It is a cross-sectional view of the upper half sleeve of the present application.

[0023] Figure 7 It is a bottom view of the upper sprocket of the present application.

[0024] Figure 8 It is a bottom view of the first upper half sprocket shaft group in Embodiment 1 of the present application.

[0025] Figure 9 It is a cross-sectional view of the second upper half sprocket shaft group in Embodiment 2 of the present application.

[0026] Figure 10 It is a flowchart of the manufacturing method of the bearing seat assembly of the present application.

[0027] Figure 11 It is a flowchart of the manufacturing method of the sprocket assembly of the present application.

[0028] Figure 12 It is a flowchart of the processing method of the sprocket shaft group of the present application.

[0029] In the figure: the upper and lower split sprocket shaft group 10, the sprocket assembly 20, the upper sprocket 21, the second positioning groove 211, the second positioning platform 212, the lower sprocket 22, the fixing plate 23, the upper pressing plate 24, the connecting groove 241, the first fixing hole 242, the lower pressing plate 25, the connecting protrusion 251, the second fixing hole 252, the bearing seat assembly 30, the upper half sleeve 31, the bolt hole 311, the first positioning groove 312, the first positioning platform 313, the lower half sleeve 32. Detailed implementation manners

[0030] The technical solutions and technical effects of the embodiments of the present invention will be further elaborated in detail below in conjunction with the accompanying drawings of the present invention.

[0031] Please refer to Figure 1 , in the first aspect, the present invention provides an upper and lower split sprocket shaft group 10, which includes a sprocket assembly 20 and two bearing seat assemblies 30 with the same structure. The two bearing seat assemblies 30 are respectively installed at both ends of the sprocket assembly 20. Each bearing seat assembly 30 includes an upper half sleeve 31 and a lower half sleeve 32. The inner sides of the upper half sleeve 31 and the lower half sleeve 32 are both used for sleeving on the shaft. The bottom end of the upper half sleeve 31 is detachably installed at the top end of the lower half sleeve 32 to form a complete bearing seat on the shaft of the sprocket shaft group; in this way, when replacing the bearing seat, only the half sleeve 31 needs to be separated from the half sleeve 31, and the bearing seat can be removed from the shaft without removing the sprocket shaft group, improving the maintenance efficiency of the sprocket shaft group.

[0032] Please refer toFigure 2 Further, the sprocket assembly 20 includes an upper sprocket 21 and a lower sprocket 22. The inner sides of the upper sprocket 21 and the lower sprocket 22 are both used to be sleeved on the shafts of the sprocket shaft group. The bottom end of the upper sprocket 21 is detachably installed at the top end of the lower sprocket 22 to form a complete sprocket on the shaft.

[0033] Please refer to Figures 2 to 5 Further, the sprocket assembly 20 further includes two fixing plates 23. Two upper pressing plates 24 are symmetrically installed at the bottom end of the upper sprocket 21, and two lower pressing plates 25 are symmetrically installed at the top end of the lower sprocket 22. Each upper pressing plate 24 is provided with a connecting groove 241 and a first fixing hole 242, and each lower pressing plate 25 is provided with a connecting protrusion 251 and a second fixing hole 252. Each upper pressing plate 24 and the lower pressing plate 25 are fixedly connected by inserting the connecting groove 241 and the connecting protrusion 251 to connect the upper sprocket 21 and the lower sprocket 22. Each fixing plate 23 covers the upper pressing plate and the lower pressing plate, and both ends are respectively bolt-connected to the first fixing hole 242 and the second fixing hole 252 on the same side to fix the upper sprocket 21 and the lower sprocket 22.

[0034] Please refer to Figure 1 Further, a plurality of bolt holes 311 are formed on each upper half sleeve 31 and the lower half sleeve 32, so that the upper half sleeve 31 and the lower half sleeve 32 are fixedly connected to the shafts of the sprocket shaft group by bolt connection to form a complete bearing seat.

[0035] When connecting the bearing seat assembly and the sprocket assembly, connection can be carried out by means of snap connection or hot welding.

[0036] Embodiment 1, the sprocket shaft group is connected by snap connection Please refer to Figures 6 to 8 Further, each upper half sleeve 31 and the lower half sleeve 32 are both provided with a first positioning groove 312 and a first positioning platform 313. Second positioning grooves 211 and second positioning platforms 212 are formed on the inner sides of both ends of the upper sprocket 21 and the lower sprocket 22. The first positioning groove 312 is used to be snap-connected to the second positioning platform 212, and the first positioning platform 313 is used to be snap-connected to the second positioning groove 211 to snap-connect the two half sleeves 31 at both ends of the upper sprocket 21 to form a first upper half sprocket shaft group; snap-connect the two half sleeves 31 at both ends of the lower sprocket 22 to form a first lower half sprocket shaft group; and fix the first upper half sprocket shaft group and the first lower half sprocket shaft group to the shafts of the sprocket shaft group by bolt-connecting each upper half sleeve 31 and the lower half sleeve 32 to form a complete sprocket shaft group.

[0037] In this embodiment, the disassembly process of the upper and lower split sprocket shaft group 10 is as follows: 1. Remove the bolts connecting the upper half sleeves 31 and the lower half sleeves 32; 2. Remove the first upper half sprocket shaft group and the first lower half sprocket shaft group from the shaft respectively; 3. Remove each upper half sleeve 31 from both ends of the upper sprocket 21, and remove each lower half sleeve 32 from both ends of the lower sprocket 22.

[0038] Example 2, the sprocket shaft group is connected by thermal welding In this embodiment, two upper half sleeves 31 are fixed to both ends of the upper sprocket 21 by thermal welding to form the second upper half sprocket shaft group; two lower half sleeves 32 are fixed to both ends of the lower sprocket 22 by thermal welding to form the second lower half sprocket shaft group; and the second upper half sprocket shaft group and the second lower half sprocket shaft group are fixed to the shaft of the sprocket shaft group by bolting each upper half sleeve 31 and the lower half sleeve 32 to form a complete sprocket shaft group.

[0039] In this embodiment, the second upper half sprocket shaft group is as Figure 9 shown, where the black part is the welding place.

[0040] In this embodiment, the material used for the sprocket shaft group is 40Cr, and the parameters of this material are as follows: hardness: HRC32 - 36; melting point: 1400 °C; critical point AC1: 747 °C, AC3: 784 °C.

[0041] In this embodiment, when thermally welding the inside of the second upper half sprocket shaft group or the second lower half sprocket shaft group, the thermally welding material used is anaerobic cylindrical part retainer of model 1620. This retainer fails when the temperature is greater than 230 °C and is easy to flow out in a liquid state when the temperature reaches 300 °C. The parameters of this retainer are as follows: density 1.15 g / cm 3 , compressive strength 150 MPa, shear strength after curing 20 MPa, flexural strength 75 MPa, initial curing time 20 min, full curing time 24 h, working temperature -60 - 230 °C.

[0042] In this embodiment, when thermally welding the outside of the second upper half sprocket shaft group or the second lower half sprocket shaft group, the thermally welding material is added to the specified position, and after thermal welding, the thermal welding place is polished to a metallic luster. The thermally welding material used is TS2111 super metal repair agent hot plating. The adhesion of this material is the strongest when the surface temperature is heated to 50 °C - 60 °C. This material forms a solid-liquid state when the temperature reaches 200 - 250 °C and is easy to form a liquid when the temperature reaches 250 - 300 °C. The parameters of this material are as follows: density 1.97 g / cm3, compressive strength 170 MPa, tensile strength 54 MPa, shear strength 21 MPa, flexural strength 77 MPa, hardness 85, initial curing time 20 min, full curing time 24 h, working temperature -60 - 160 °C.

[0043] In this embodiment, the disassembly process of the upper and lower split sprocket shaft group 10 is as follows: 1. Remove the bolts connecting the upper half sleeves 31 and the lower half sleeves 32; 2. Remove the first upper half sprocket shaft group and the first lower half sprocket shaft group from the shaft respectively; 3. Heat the hot welding parts of the first upper half sprocket shaft group and the first lower half sprocket shaft group respectively to make the hot welding material turn into liquid and flow out; 4. Remove the upper half sleeves 31 from both sides of the upper sprocket 21, and remove the lower half sleeves 32 from both sides of the lower sprocket 22.

[0044] The connection method provided in Embodiment 1 is simpler to disassemble and assemble than the connection method provided in Embodiment 2, and no hot welding is required; the connection method provided in Embodiment 2 is more reliable in connection between the components of the sprocket shaft group than the connection method provided in Embodiment 1.

[0045] In the second aspect, the present invention provides a manufacturing method of the upper and lower split sprocket shaft group 10 as in the first aspect, including the manufacturing method of the bearing seat assembly 30, the manufacturing method of the sprocket assembly 20 and the sprocket shaft group processing method. Among them, the manufacturing methods of the bearing seat and the sprocket assembly 20 are both realized based on the metal cutting process; the sprocket shaft group processing method is used to assemble and process the bearing seat assembly 30 manufactured based on the manufacturing method of the bearing seat and the sprocket assembly 20 manufactured based on the manufacturing method of the sprocket assembly 20 based on the hot welding process, the metal cutting process and the heat treatment process; specifically, the manufacturing methods of the bearing seat assembly 30 and the sprocket assembly 20 can be carried out synchronously to improve the manufacturing speed of the upper and lower split sprocket shaft group 10.

[0046] Please refer to Figure 10 , further, the manufacturing method of the bearing seat assembly 30 includes the following steps: S101, process the raw material into a first blank with a corresponding shape. Specifically, the overall length allowance is 35 mm, and the outer diameter and inner hole allowance are 15 mm; S102, mill the first port surface on the first blank; S103, based on the first port surface, mill the bolt groove, drill the bolt hole 311, process it into the upper half sleeve 31, and process the lower half sleeve 32 according to the same steps; S104, align the end faces of the upper half sleeve 31 and the lower half sleeve 32 and assemble them into a bearing seat, and fix and connect them with bolts; S105, perform a rough turning end face process and a rough turning inner hole process on the bearing seat; S106, mill the groove straight platform, and turn out the first positioning groove 312 and the first positioning platform 313; S107, mill the first weld bead based on the mating surface. Specifically, mill away 15 mm of the first weld bead and leave a 3-mm allowance along the entire length. S108, disassemble the bearing housing into the upper half sleeve 31 and the lower half sleeve 32.

[0047] Please refer to Figure 11 , further, the manufacturing method of the sprocket assembly 20 includes the following steps: S201, process the raw material into a second blank of the corresponding shape. Specifically, leave a 35-mm allowance along the entire length and a 15-mm allowance for the outer diameter and inner hole. S202, mill the second mating surface on the second blank. S203, mill the pressure plate groove based on the second mating surface. S204, install the upper pressure plate 24 into the pressure plate groove to form the upper sprocket 21, and install the lower pressure plate 25 into the pressure plate groove to form the lower sprocket 22. S205, insert and connect the upper sprocket 21 and the lower sprocket 22 to form a sprocket, and fix it with the fixing plate 23. S206, perform rough turning of the end face process, rough turning of the inner hole process, and rough turning of the tooth groove process on the sprocket. S207, flame gouge the tooth profile on the sprocket and perform quenching and tempering operations on the sprocket. S208, perform semi-finish turning on the sprocket. S209, mill the end face, machine the second positioning groove 211 and the second positioning platform 212. S210, disassemble the sprocket into the upper sprocket 21 and the lower sprocket 22. S211, mill the second weld bead on the upper sprocket 21 and the lower sprocket 22 based on the end face.

[0048] Please refer to Figure 12 , further, the processing method of the sprocket shaft group includes the following steps: S301, use hot-dip metal to thermally weld two upper half sleeves 31 to both sides of the upper sprocket 21 to form the upper half sprocket shaft group, and use hot-dip metal to thermally weld two lower half sleeves 32 to both sides of the lower sprocket 22 to form the lower half sprocket shaft group. S302, combine the upper half sprocket shaft group and the lower half sprocket shaft group into a complete sprocket shaft group. S303, perform boring of the inner hole process and turning of the outer diameter process on the sprocket shaft group. S304, mill the chain socket and the tooth profile wheel on the sprocket shaft group. S305, perform heat treatment quenching on the sprocket shaft group. S306, disassemble the sprocket shaft group into the upper half sprocket shaft group and the lower half sprocket shaft group. S307. Mill keycaps on the upper half sprocket shaft group and the lower half sprocket shaft group respectively, and machine and inspect the threaded holes. S308. Heat the hot welding areas of the upper half sprocket shaft group and the lower half sprocket shaft group to make the hot-dip metal flow out in a liquid state, and disassemble the upper half sprocket shaft group and the lower half sprocket shaft group.

[0049] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sprocket shaft assembly with upper and lower parts, characterized in that: It includes a sprocket assembly and two bearing seat assemblies with the same structure. The two bearing seat assemblies are respectively installed at the two ends of the sprocket assembly. Each bearing seat assembly includes an upper sleeve and a lower sleeve. The inner sides of the upper sleeve and the lower sleeve are used to be sleeved on the shaft. The bottom end of the upper sleeve can be detachably installed on the top end of the lower sleeve to form a complete bearing seat on the shaft of the sprocket shaft assembly.

2. The upper and lower split sprocket shaft assembly according to claim 1, characterized in that: The sprocket assembly includes an upper sprocket and a lower sprocket. The inner sides of the upper sprocket and the lower sprocket are used to be mounted on the shaft of the sprocket shaft assembly. The bottom end of the upper sprocket is detachably mounted on the top end of the lower sprocket to form a complete sprocket on the shaft.

3. The upper and lower split sprocket shaft assembly according to claim 2, characterized in that: The sprocket assembly also includes two fixing plates, two upper pressure plates are symmetrically installed at the bottom end of the upper sprocket, and two lower pressure plates are symmetrically installed at the top end of the lower sprocket, each upper pressure plate is provided with a connecting groove and a first fixing hole, each lower pressure plate is provided with a connecting protrusion and a second fixing hole, each upper pressure plate and the lower pressure plate are fixedly connected by plugging the connecting groove and the connecting protrusion to connect the upper sprocket with the lower sprocket, each fixing plate covers the upper pressure plate and the lower pressure plate, and the two ends are respectively bolted to the first fixing hole and the second fixing hole on the same side to fix the upper sprocket with the lower sprocket.

4. The upper and lower split sprocket shaft assembly according to claim 3, characterized in that: A plurality of bolt holes are provided on each of the upper sleeve and the lower sleeve so that the upper sleeve and the lower sleeve are fixedly connected to the shaft of the sprocket shaft assembly by bolt connection to form a complete bearing seat.

5. The upper and lower split sprocket shaft assembly according to claim 4, characterized in that: Each upper half sleeve and lower half sleeve is provided with a first positioning groove and a first positioning platform, and the inner sides of both ends of the upper sprocket and the lower sprocket are provided with a second positioning groove and a second positioning platform, the first positioning groove is used to clamp with the second positioning platform, and the first positioning platform is used to clamp with the second positioning groove, so that the two upper half sleeves are clamped at the two ends of the upper sprocket to form a first upper half sprocket shaft group; the two lower half sleeves are clamped at the two ends of the lower sprocket to form a first lower half sprocket shaft group; and the first upper half sprocket shaft group and the first lower half sprocket shaft group are fixed to the shaft of the sprocket shaft group by bolting each upper half sleeve to the lower half sleeve to form a complete sprocket shaft group.

6. The upper and lower split sprocket shaft assembly according to claim 3, characterized in that: The two upper half sleeves are fixed to the two ends of the upper sprocket by heat welding to form a second upper half sprocket shaft group; the two lower half sleeves are fixed to the two ends of the lower sprocket by heat welding to form a second lower half sprocket shaft group; and the second upper half sprocket shaft group and the second lower half sprocket shaft group are fixed to the shaft of the sprocket shaft group by bolting each upper half sleeve to the lower half sleeve to form a complete sprocket shaft group.

7. A method for manufacturing an upper and lower split sprocket shaft assembly as claimed in any one of claims 1 to 6, characterized in that: It includes a manufacturing method for a bearing seat assembly, a manufacturing method for a sprocket assembly and a processing method for a sprocket shaft assembly, wherein the manufacturing method for the bearing seat and the manufacturing method for the sprocket assembly are both implemented based on a metal cutting process; the processing method for the sprocket shaft assembly is used to assemble and process the bearing seat assembly manufactured based on the manufacturing method for the bearing seat and the sprocket assembly manufactured based on the manufacturing method for the sprocket assembly based on a hot welding process, a metal cutting process and a heat treatment process.

8. The manufacturing method according to claim 7, characterized in that: The manufacturing method of the bearing seat assembly comprises the following steps: S101, processing the raw material into a first blank of corresponding shape; S102, milling a first surface on the first blank; S103, based on the first mouth surface, mill out the bolt groove, drill the bolt hole, process it into an upper sleeve, and process the lower sleeve in the same way; S104, aligning the end faces of the upper sleeve and the lower sleeve to form a bearing seat, and fixing the connection with bolts; S105, performing a rough turning process on the end surface and a rough turning process on the inner hole of the bearing seat; S106, milling out the groove straight platform, turning out the first positioning groove and the first positioning platform; S107, milling out the first weld bead based on the joint surface; S108, split the bearing seat into an upper sleeve and a lower sleeve.

9. The manufacturing method according to claim 7, characterized in that: The manufacturing method of the sprocket assembly comprises the following steps: S201, processing the raw material into a second blank of corresponding shape; S202, milling a second surface on the second blank; S203, based on the second mouth surface, milling out a pressing plate groove; S204, installing the upper pressing plate into the pressing plate groove to form an upper sprocket, and installing the lower pressing plate into the pressing plate groove to form a lower sprocket; S205, plugging the upper sprocket and the lower sprocket into a sprocket, and fixing them with a fixing plate; S206, performing a rough turning process of the end surface, a rough turning process of the inner hole and a rough turning process of the tooth groove on the sprocket; S207, flame cutting the teeth on the sprocket and performing quenching and tempering operations on the sprocket; S208, semi-finishing turning operation is performed on the sprocket; S209, milling out the end surface, and machining out the second positioning groove and the second positioning platform; S210, splitting the sprocket into an upper sprocket and a lower sprocket; S211, based on the end face, a second weld bead is milled on the upper sprocket and the lower sprocket.

10. The manufacturing method according to claim 7, characterized in that: The sprocket shaft assembly processing method comprises the following steps: S301, using hot-dip metal to heat-weld two upper half sleeves to both sides of the upper sprocket to form an upper half sprocket shaft assembly, and using hot-dip metal to heat-weld two lower half sleeves to both sides of the lower sprocket to form a lower half sprocket shaft assembly; S302, combining the upper half sprocket shaft assembly and the lower half sprocket shaft assembly into a complete sprocket shaft assembly; S303, performing inner hole boring and outer circle turning processes on the sprocket shaft assembly; S304, milling a chain pocket and a toothed wheel on the sprocket shaft assembly; S305, performing heat treatment and quenching treatment on the sprocket shaft assembly; S306, disassembling the sprocket shaft assembly into an upper sprocket shaft assembly and a lower sprocket shaft assembly; S307, milling key caps on the upper sprocket shaft assembly and the lower sprocket shaft assembly and processing inspection threaded holes; S308, heating the hot welding points of the upper half sprocket shaft assembly and the lower half sprocket shaft assembly to make the hot-dip metal flow out in liquid form, and separating the upper half sprocket shaft assembly and the lower half sprocket shaft assembly.

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