Novel shaft head sealing method for double-horizontal-shaft stirrer

Abstract

The invention relates to a novel shaft head sealing method for a double-horizontal-shaft stirrer. The novel shaft head sealing method comprises the following steps: (1) assembling and preliminarily fixing parts; (2) mounting a sealing element; (3) connecting and fixing; (4) running and sealing; and (5) maintenance and disassembly. The method has the advantages that the assembly process is simplified, the assembly efficiency is improved, the assembly difficulty and the labor intensity are reduced, and the method is particularly suitable for large-scale production and maintenance operation.

Description

Technical Field

[0001] The invention relates to a novel shaft head sealing method for a twin-horizontal shaft mixer, belonging to the technical field of mixers. Background Art

[0002] Horizontal shaft mixer is a kind of construction machinery, which is mainly used for mixing cement, sand, various dry mortar and other construction materials.

[0003] The shaft seal is the core component of the horizontal shaft mixer. Once the shaft seal fails, it is very likely to cause damage to the bearing, reducer, main shaft, stirring device and other parts at the same time. The replacement cost is high and the time is long. Therefore, the reliability of the shaft seal determines the quality of the horizontal shaft mixer. At present, the shaft main seal of the mainstream horizontal shaft mixer on the market adopts a floating oil seal structure. The floating oil seal technology itself has been mature for many years, but the reliability and life of the shaft seal of most horizontal shaft mixers are not satisfactory. Putting aside the quality factors of floating oil seals and lubrication pumps and factors of human maintenance, the main reasons are analyzed as follows: First, the size of the barrel and main shaft is large, and the processing accuracy is difficult to control; second, the deformation after processing is large, and the deformation after loading and heating is also large, and the deformation direction of the barrel and shaft is different, and it is unpredictable and controllable; third, it is impossible to check and adjust the axial compression and clearance of the floating oil seal after installation. A large number of floating oil seals in horizontal shaft mixers have problems with their axial positioning. The axial direction of the floating oil seal is simultaneously related to the barrel, main shaft, shaft head parts, bearings and other aspects. The final cumulative error of the barrel, main shaft, shaft head and installation is likely to seriously exceed the allowable range of the floating oil seal, which is the main cause of seal failure.

[0004] In addition, the installation and replacement of the shaft head seal is complicated, labor-intensive and difficult to control precision, which is also a problem criticized by workshop installation workers and customers.

[0005] In the prior art, the shaft head seal of the horizontal shaft mixer has problems such as complex installation, large workload, and difficulty in controlling accuracy. In addition, the service life of the sealing device is short, and the bearing, reducer, main shaft, stirring device and other parts are easily damaged due to seal failure, and the replacement cost is high and the time is long. Summary of the invention

[0006] In order to overcome the defects of the prior art, the present invention provides a novel twin-shaft mixer shaft head sealing method. The technical solution of the present invention is:

[0007] A novel twin-shaft mixer shaft head sealing method comprises the following steps:

[0008] (1) Assembly and preliminary fixing; (2) Seal installation; (3) Connection and fixing; (4) Operation and sealing; (5) Maintenance and disassembly.

[0009] The step (1) is specifically as follows: pre-installing the first tooling flange (27) on the rotating hub threaded hole group (19) on the end face of the rotating hub (4) and the second threaded hole group (24) on the end face of the fixed hub (5) to ensure the initial fixation and alignment between the rotating hub (4) and the fixed hub (5); at the same time, pre-installing the second tooling flange (28) on the threaded hole on the end face of the outer protective ring (10) and the threaded hole on the end face of the inner protective ring (13);

[0010] The outer protective ring (10) is installed on the inner side of the fixed hub (5); the protective sleeve (11) is installed on the inner side of the rotating hub (4); the sealing pressure ring (12) is installed on the inner side of the protective sleeve (11); and the inner protective ring (13) is installed on the inner side of the sealing pressure ring (12); the outer protective ring (10), the protective sleeve (11), the sealing pressure ring (12), and the inner protective ring (13) are all arranged in a half-split structure.

[0011] The step (2) specifically comprises: installing a floating oil seal (6) in a rotating hub floating oil seal groove (17) of the rotating hub (4) to form a seal between the rotating hub (4) and the fixed hub (5); the floating oil seal (6) can automatically adjust the degree of fit between the sealing lip and the sealing surface to adapt to the deflection and vibration of the main shaft and always maintain a stable sealing effect; installing an O-ring (14) in an O-ring groove (20) of the rotating hub (4) to form a seal between the rotating hub (4) and the main shaft (3); the O-ring (14) forms a tight seal between the rotating hub (4) and the main shaft (3) by relying on its own elasticity, effectively preventing the leakage of liquid and gas; installing a one-way oil seal (15) in the middle of the fixed hub (5), and installing a rotary oil seal (16) inside one end of the fixed hub (5); the one-way oil seal (15) and the rotary oil seal (16) respectively play a sealing role at different positions of the fixed hub (5) to enhance the sealing performance of the entire shaft head.

[0012] The step (3) is specifically as follows: installing the connecting part of the expansion cone sleeve (7) on the outer end of the rotating hub (4), the expansion part of the expansion cone sleeve (7) is located between the rotating hub (4) and the main shaft (3), and fixing the rotating hub (4) on the main shaft (3) by the expansion action, thereby ensuring the stability and concentricity of the rotating hub (4) on the main shaft (3); connecting the rotating hub (4) and a transparent cover (9) located outside the rotating hub (4) by using a tensioning bolt (8), and the transparent cover (9) is simultaneously fixed to the outer end of the fixed hub (5); fixing the transparent cover (9) and the outer protective ring (10) on the fixed hub (5) by bolts through the first threaded hole group (22) and the second threaded hole group (24) on the fixed hub (5); and passing a polished rod for connecting with the cylinder (1) through the interior of the polished hole group (21), thereby ensuring accurate positioning and stable connection between the fixed hub (5) and the cylinder (1).

[0013] The step (4) is specifically as follows: during the operation of the mixer, four different types of seals, namely the floating oil seal (6), the O-ring (14), the one-way oil seal (15) and the rotary oil seal (16), cooperate with each other to form an all-round, multi-layered sealing system; the sheath (11) is installed on the inner side of the rotating hub (4) to effectively protect the rotating hub (4) from wear; the outer protective ring (10), the sealing pressure ring (12) and the inner protective ring (13) are arranged in sequence to form a multi-layer sealing barrier, making it more difficult for materials and external impurities to enter the mixer through the shaft head, thereby enhancing the reliability of the seal.

[0014] The step (5) is specifically as follows: first, the tensioning bolt (8) and the transparent cover (9) are removed, and then the outer protective ring (10), the sheath (11), the sealing pressure ring (12) and the inner protective ring (13) are removed in sequence; since the outer protective ring (10), the sheath (11), the sealing pressure ring (12) and the inner protective ring (13) are all arranged in a half-split structure, they are easy to remove and replace.

[0015] A group of bearing seats (2) are installed in the middle of the cylinder (1); one end of the main shaft (3) is rotatably installed on the bearing seat (2), and the other end extends to the inside of the cylinder (1); the rotating hub (4) is sleeved on the outer periphery of the main shaft (3), and a fixed hub (5) is sleeved on the outer periphery of the rotating hub (4), and the fixed hub (5) is fixedly installed on the inner side of the middle of the cylinder (1); the connecting part of the expansion cone sleeve (7) is installed on the outer end of the rotating hub (4), and the expansion part of the expansion cone sleeve (7) is located between the rotating hub (4) and the main shaft (3), and is used to fix the rotating hub (4) on the main shaft (3); the tensioning bolt (8) is used to connect the rotating hub (4) and a transparent cover (9) located on the outer side of the rotating hub (4), and the transparent cover (9) is also fixed to the outer end of the fixed hub (5).

[0016] A floating oil seal (6) is installed between the rotating hub (4) and the fixed hub (5); an O-ring (14) is installed between the rotating hub (4) and the main shaft (3); a one-way oil seal (15) is installed in the middle of the fixed hub (5), and a rotary oil seal (16) is installed inside one end of the fixed hub (5); the floating oil seal (6) is installed in a rotating hub floating oil seal groove (17) to form a seal between the rotating hub (4) and the fixed hub (5); the O-ring (14) is installed in an O-ring groove (20) to form a seal between the rotating hub (4) and the main shaft (3).

[0017] The rotating hub (4) is provided with a rotating hub floating oil seal groove (17), an inner conical surface (18), a rotating hub threaded hole group (19) and an O-ring groove (20). The rotating hub floating oil seal groove (17) is located on the outer ring of the rotating hub (4) and is used to accommodate a floating oil seal (6); the inner conical surface (18) is located on the inner side of the rotating hub (4) and is matched with a tightening cone sleeve (7) to achieve a fixed connection between the rotating hub (4) and the main shaft (3), thereby ensuring the stability and concentricity of the rotating hub (4) on the main shaft (3); the rotating hub threaded hole group (19) is distributed on the end surface of the rotating hub (4) away from the inner conical surface (18) and is connected to the sealing pressure ring (12) by bolts; the O-ring groove (20) is located inside the rotating hub (4) and is used to install an O-ring (14). The O-ring (14) is tightly attached to the main shaft (3) to form a seal between the rotating hub (4) and the main shaft (3).

[0018] The fixed hub (5) is provided with a light hole group (21), a first threaded hole group (22), an oil seal groove (23), a second threaded hole group (24), a fixed hub floating oil seal groove (25) and an oil seal groove (26); the light hole group (21) passes through a light rod for connecting with the cylinder (1); the first threaded hole group (22) is provided on one side of the fixed hub (5), and the transparent cover (9) is installed at the first threaded hole group (22) by bolts; the second threaded hole group (24) is provided on the other side of the fixed hub (5), and is connected with the outer protective ring (10) by bolts at the second threaded hole group (24); the fixed hub floating oil seal groove (25) is used to accommodate a floating oil seal (6) to ensure the sealing between the fixed hub (5) and the rotating hub (4); the first oil seal groove (23) is provided on one side of the fixed hub floating oil seal groove (25), and the second oil seal groove (26) is provided on the other side of the fixed hub floating oil seal groove (25). The advantages of the present invention are:

[0019] 1. It simplifies the assembly process, improves assembly efficiency, reduces assembly difficulty and labor intensity, and is especially suitable for large-scale production and maintenance operations.

[0020] 2. The outer protective ring, sleeve, sealing pressure ring and inner protective ring are all split in half, which is convenient for replacement and maintenance from the inside of the cylinder after the outer protective ring, sleeve, sealing pressure ring and inner protective ring are worn, without removing the reducer, bearing and main shaft, further improving the convenience and efficiency of maintenance.

[0021] 3. Multi-layer sealing structure: Through the cooperation of four different types of seals, namely floating oil seal, O-ring, one-way oil seal and rotary oil seal, an all-round, multi-level sealing system is formed, which further enhances the sealing performance of the entire shaft head and almost eliminates the possibility of material leakage and entry of external impurities.

[0022] 4. This sealing structure can adapt to mixing materials of different types and humidity, such as dry hard, plastic, and fluid concrete. Even when the material is relatively viscous or contains more impurities, it can maintain a good sealing effect and meet the mixing needs of various engineering projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic diagram of the main structure of a sealing device for realizing the novel twin-shaft mixer shaft head sealing method of the present invention.

[0024] Figure 2 yes Figure 1 Schematic diagram of the transfer hub structure.

[0025] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle fixed hub.

[0026] Figure 4 yes Figure 1 Schematic diagram of the installation structure of the first tooling flange.

[0027] Figure 5 yes Figure 1 Schematic diagram of the installation structure of the second tooling flange. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0029] See also Figures 1 to 5 The present invention relates to a novel method for sealing the shaft head of a twin-shaft mixer, comprising the following steps: (1) assembly and preliminary fixation; (2) installation of sealing components; (3) connection and fixation; (4) operation and sealing; and (5) maintenance and disassembly.

[0030] The step (1) is specifically as follows: pre-install the first tooling flange 27 on the rotating hub threaded hole group 19 on the end face of the rotating hub 4 and the second threaded hole group 24 on the end face of the fixed hub 5 to ensure the initial fixation and alignment between the rotating hub 4 and the fixed hub 5; at the same time, pre-install the second tooling flange 28 on the threaded holes on the end face of the outer protective ring 10 and the threaded holes on the end face of the inner protective ring 13; by using the first tooling flange 27 and the second tooling flange 28, the assembler can more conveniently perform the connection and fixation operations of the components. The pre-installed design of the tooling flange provides a standardized assembly interface, which makes the connection between the components more standardized and unified, simplifies the assembly process, improves the assembly efficiency, reduces the assembly difficulty and labor intensity, and is particularly suitable for large-scale production and maintenance operations.

[0031] The outer protective ring 10 is installed on the inner side of the fixed hub 5; the sleeve 11 is installed on the inner side of the rotating hub 4; the sealing pressure ring 12 is installed on the inner side of the sleeve 11; the inner protective ring 13 is installed on the inner side of the sealing pressure ring 12; the outer protective ring 10, the sleeve 11, the sealing pressure ring 12, and the inner protective ring 13 are all arranged in a half-split structure, which is convenient for the outer protective ring 10, the sleeve 11, the sealing pressure ring 12, and the inner protective ring 13 to be replaced and maintained from the inside of the cylinder after they are worn, without removing the reducer, the bearing and the main shaft.

[0032] The step (2) is specifically as follows: installing the floating oil seal 6 in the floating oil seal groove 17 of the rotating hub 4 to form a seal between the rotating hub 4 and the fixed hub 5; the floating oil seal 6 can automatically adjust the degree of fit between the sealing lip and the sealing surface to adapt to the deflection and vibration of the main shaft and always maintain a stable sealing effect; installing the O-ring 14 in the O-ring groove 20 of the rotating hub 4 to form a seal between the rotating hub 4 and the main shaft 3; the O-ring 14 relies on its own elasticity to form a tight seal between the rotating hub 4 and the main shaft 3, effectively preventing the leakage of liquid and gas; installing a one-way oil seal 15 in the middle of the fixed hub 5, and installing a rotary oil seal 16 inside one end of the fixed hub 5; the one-way oil seal 15 and the rotary oil seal 16 respectively play a sealing role at different positions of the fixed hub 5 to enhance the sealing performance of the entire shaft head.

[0033] The step (3) is specifically as follows: installing the connecting part of the expansion cone sleeve 7 on the outer end of the rotating hub 4, the expansion part of the expansion cone sleeve 7 is located between the rotating hub 4 and the main shaft 3, and the rotating hub 4 is fixed on the main shaft 3 by the expansion action, thereby ensuring the stability and concentricity of the rotating hub 4 on the main shaft 3; using the tensioning bolt 8 to connect the rotating hub 4 and the transparent cover 9 located on the outer side of the rotating hub 4, and the transparent cover 9 is fixed to the outer end of the fixed hub 5 at the same time; through the first threaded hole group 22 and the second threaded hole group 24 on the fixed hub 5, the transparent cover 9 and the outer protective ring 10 are fixed to the fixed hub 5 with bolts respectively; the light rod for connecting with the cylinder body 1 passes through the inside of the light hole group 21, thereby ensuring the precise positioning and stable connection between the fixed hub 5 and the cylinder body 1.

[0034] The step (4) is specifically as follows: during the operation of the mixer, four different types of seals, namely the floating oil seal 6, the O-ring 14, the one-way oil seal 15 and the rotary oil seal 16, cooperate with each other to form an all-round, multi-level sealing system; the sheath 11 is installed on the inner side of the rotating hub 4, which can effectively protect the rotating hub 4 from wear; the outer protective ring 10, the sealing pressure ring 12 and the inner protective ring 13 are arranged in sequence to form a multi-channel sealing barrier, making it more difficult for materials and external impurities to enter the mixer through the shaft head, thereby enhancing the reliability of the seal. The mutual support and cooperation of the above components make the structure of the entire shaft head sealing device more compact and stable, and can better resist the influence of various external forces and vibrations, reduce the looseness and displacement between components, and improve the operating stability of the entire device.

[0035] The step (5) is specifically as follows: first, remove the tension bolt 8 and the transparent cover 9, and then remove the outer protective ring 10, the sheath 11, the sealing pressure ring 12 and the inner protective ring 13 in sequence; since the outer protective ring 10, the sheath 11, the sealing pressure ring 12 and the inner protective ring 13 are all arranged in a half-split structure, they are easy to remove and replace. The structural design of the present invention makes it more convenient to replace the seal. The seal can be inspected and replaced by removing the tension bolt 8 and the transparent cover 9 without large-scale disassembly of the entire mixer, which further improves the convenience of maintenance.

[0036] A set of bearing seats 2 are installed in the middle of the cylinder 1; one end of the main shaft 3 is rotatably installed on the bearing seat 2, and the other end extends to the inside of the cylinder 1; the rotating hub 4 is sleeved on the periphery of the main shaft 3, and a fixed hub 5 is sleeved on the periphery of the rotating hub 4, and the fixed hub 5 is fixedly installed on the inner side of the middle of the cylinder 1; the connecting part of the expansion cone sleeve 7 is installed on the outer end of the rotating hub 4, and the expansion part of the expansion cone sleeve 7 is located between the rotating hub 4 and the main shaft 3, which is used to fix the rotating hub 4 on the main shaft 3; the tension bolt 8 is used to connect the rotating hub 4 and the transparent cover 9 located on the outer side of the rotating hub 4, and the transparent cover 9 is also fixed to the outer end of the fixed hub 5. The above scheme achieves the following advantages:

[0037] Multi-layer sealing structure design: the rotating hub 4 is sleeved on the outer periphery of the main shaft 3, the fixed hub 5 is sleeved on the outer periphery of the rotating hub 4 and fixedly installed on the inner side of the middle part of the cylinder 1, the expansion part of the expansion cone sleeve 7 is located between the rotating hub 4 and the main shaft 3, the tensioning bolt 8 connects the rotating hub 4 and the transparent cover 9, and the transparent cover 9 is fixed on the outer end of the fixed hub 5 to form a multi-layer sealing structure, which effectively prevents the material from leaking from the shaft head and prevents external impurities from entering the mixer, thereby ensuring the cleanliness and normal operation of the mixer.

[0038] This sealing structure can adapt to mixing materials of different types and humidity, such as dry hard, plastic, and fluid concrete. Even when the material is relatively viscous or contains more impurities, it can maintain a good sealing effect and meet the mixing needs of various engineering projects.

[0039] One end of the main shaft 3 is rotatably mounted on the bearing seat 2, and the other end extends into the cylinder 1. The bearing seat 2 provides a stable support base for the shaft head sealing device, ensuring that the main shaft 3 can run smoothly during rotation, reducing vibration and swing, thereby improving the mixing quality and operation stability of the mixer.

[0040] Components are tightly connected: the expansion part of the expansion cone sleeve 7 fixes the rotating hub 4 firmly on the main shaft 3, and the tightening bolts 8 further tightly connect the rotating hub 4 and the transparent cover 9. The transparent cover 9 is fixed to the outer end of the fixed hub 5. The tight connection between the components enhances the structural stability of the entire device, avoids sealing failure and mixer failure caused by loose components, and extends the service life of the equipment.

[0041] Easy to disassemble and assemble: The various components of the sealing device are connected by bolts, expansion sleeves and other easy-to-disassemble methods. When maintenance, overhaul or replacement of parts is required, the components can be quickly disassembled without complicated tools and tedious operating steps, which greatly reduces the difficulty and cost of maintenance, improves maintenance efficiency and reduces downtime.

[0042] Easy replacement of seals: seals are vulnerable parts in the sealing device and need to be replaced regularly. The structural design of the present invention makes it more convenient to replace the seals. The seals can be inspected and replaced by simply removing the tension bolts 8 and the transparent cover 9. There is no need to disassemble the entire mixer on a large scale, which further improves the convenience of maintenance.

[0043] Good coordination with the mixer as a whole: The shaft head sealing device can coordinate well with other parts of the twin-horizontal-shaft mixer, such as the mixing blades, the unloading device, etc., and will not affect the overall performance and working efficiency of the mixer. It has good versatility and compatibility and can be widely used in twin-horizontal-shaft mixers of different models and specifications.

[0044] Easy to integrate and transform: For existing twin-shaft mixers, the sealing device can be easily integrated and installed without large-scale transformation of the main structure of the mixer, which reduces the cost and difficulty of equipment upgrades and transformations, and helps to improve the technical level and performance of the mixer.

[0045] A floating oil seal 6 is installed between the rotating hub 4 and the fixed hub 5; an O-ring 14 is installed between the rotating hub 4 and the main shaft 3, a one-way oil seal 15 is installed in the middle of the fixed hub 5, and a rotary oil seal 16 is installed inside one end of the fixed hub 5. The four different types of seals, namely the floating oil seal 6, the O-ring 14, the one-way oil seal 15 and the rotary oil seal 16, cooperate with each other to form an all-round and multi-level sealing system. The floating oil seal 6 can automatically adjust the degree of fit between the sealing lip and the sealing surface, adapt to the deflection and vibration of the shaft, and always maintain a good sealing effect; the O-ring 14 relies on its own elasticity to form a tight seal between the rotating hub 4 and the main shaft 3, effectively preventing the leakage of liquid and gas; the one-way oil seal 15 and the rotary oil seal 16 play a sealing role at different positions of the fixed hub 5, further enhancing the sealing performance of the entire shaft head, and almost eliminating the possibility of material leakage and external impurities entering.

[0046] The floating oil seal 6 is installed in the floating oil seal groove 17 of the rotating hub to form a seal between the rotating hub 4 and the fixed hub 5; the O-ring 14 is installed in the O-ring groove 20 to form a seal between the rotating hub 4 and the main shaft 3.

[0047] The hub 4 is provided with a hub floating oil seal groove 17, an inner conical surface 18, a hub threaded hole group 19 and an O-ring groove 20. The hub floating oil seal groove 17 is located on the outer ring of the hub 4 and is used to accommodate the floating oil seal 6; the inner conical surface 18 is located on the inner side of the hub 4, and through cooperation with the expansion cone sleeve 7, a fixed connection between the hub 4 and the main shaft 3 is achieved to ensure the stability and concentricity of the hub 4 on the main shaft 3; the hub threaded hole group 19 is distributed on the end surface of the hub 4 away from the inner conical surface 18, and is connected to the sealing pressure ring 12 by bolts; the O-ring groove 20 is located inside the hub 4 and is used to install the O-ring 14, and the O-ring 14 is tightly attached to the main shaft 3.

[0048] The floating oil seal groove 17 of the rotating hub is located on the outer ring of the rotating hub 4, providing a precise installation position for the floating oil seal 6. This design ensures that the floating oil seal 6 can be accurately installed at the predetermined position, and forms a good sealing contact between the rotating hub 4 and the fixed hub 5. The floating oil seal 6 can automatically adjust the fit between the sealing lip and the sealing surface to adapt to the deflection and runout of the shaft, thereby always maintaining a stable sealing effect and effectively preventing material leakage and foreign impurities from entering.

[0049] The O-ring groove 20 is located inside the rotating hub 4 and is specifically used to install the O-ring 14. The design of the O-ring groove 20 allows the O-ring 14 to be tightly embedded therein and closely attached to the main shaft 3, thereby forming a seal between the rotating hub 4 and the main shaft 3. This structure not only improves the installation stability of the O-ring 14, but also enhances its sealing performance, effectively preventing the leakage of liquid and gas between the rotating hub 4 and the main shaft 3, and further improves the sealing reliability of the entire shaft head sealing device. The inner conical surface 18 is located on the inner side of the rotating hub 4, and is fixedly connected to the main shaft 3 by cooperating with the expansion cone sleeve 7. This conical surface matching method can ensure the stability and concentricity of the rotating hub 4 on the main shaft 3, so that the rotating hub 4 maintains good coaxiality with the main shaft 3 during rotation, and reduces vibration and swing caused by eccentricity. This not only helps to improve the mixing quality of the mixer, but also reduces equipment noise and component fatigue damage caused by vibration, thereby extending the service life of the equipment.

[0050] The hub threaded hole group 19 is distributed on the end surface of the hub 4 away from the inner cone 18, and is connected to the sealing ring 12 by bolts. This threaded hole design makes the connection between the hub 4 and the sealing ring 12 more firm and reliable, and enhances the cooperative working ability between the components. During the operation of the mixer, even if it is impacted by the material and the rotation force of the mixing blades, the hub 4 and the sealing ring 12 can maintain a tight connection, ensuring the integrity of the sealing structure and preventing the seal from failing due to loose components.

[0051] A smooth hole group 21, a first threaded hole group 22, an oil seal groove 23, a second threaded hole group 24, a fixed hub floating oil seal groove 25 and an oil seal groove 26 are provided on the fixed hub 5. A smooth rod for connecting to the cylinder body 1 passes through the inside of the smooth hole group 21; the first threaded hole group 22 is provided on one side of the fixed hub 5, and the transparent cover 9 is installed at the first threaded hole group 22 by bolts; the second threaded hole group 24 is provided on the other side of the fixed hub 5, and is connected to the outer protective ring 10 by bolts at the second threaded hole group 24; the fixed hub floating oil seal groove 25 is used to accommodate the floating oil seal 6 to ensure the sealing between the fixed hub 5 and the rotating hub 4; the first oil seal groove 23 is provided on one side of the fixed hub floating oil seal groove 25, and the second oil seal groove 26 is provided on the other side of the fixed hub floating oil seal groove 25.

[0052] The polished rod for connecting with the cylinder 1 passes through the inside of the polished hole group 21. This design can ensure the accurate positioning and stable connection between the fixed hub 5 and the cylinder 1. The polished hole group 21 provides an accurate installation channel for the polished rod, so that the fixed hub 5 can be firmly fixed on the inner side of the middle part of the cylinder 1, providing a stable support foundation for the entire shaft head sealing device, reducing vibration and swing caused by loose connection, and improving the operating stability of the mixer.

[0053] The first threaded hole group 22 and the second threaded hole group 24 are respectively arranged on both sides of the fixed hub 5, and are respectively connected to the transparent cover 9 and the outer protective ring 10 by bolts. This threaded connection method has high connection strength and reliability, can withstand various forces and torques generated during the operation of the mixer, and ensure close fit between various components. At the same time, the threaded connection is easy to install and disassemble, which is convenient for maintenance personnel to inspect, repair and replace components of the sealing device.

[0054] The fixed hub floating oil seal groove 25 is used to accommodate the floating oil seal 6 to ensure the sealing between the fixed hub 5 and the rotating hub 4. The floating oil seal 6 can automatically adjust the fit between the sealing lip and the sealing surface to adapt to the deflection and vibration of the shaft and always maintain a stable sealing effect. A first oil seal groove 23 is set on one side of the fixed hub floating oil seal groove 25, and a second oil seal groove 26 is set on the other side. These two oil seal grooves can be installed with other types of seals, such as a one-way oil seal 15 and a rotary oil seal 16, etc., which work together with the floating oil seal 6 to form a multi-channel sealing barrier, further enhancing the sealing performance of the entire shaft head, effectively preventing material leakage and external impurities from entering, and ensuring the normal operation and mixing quality of the mixer.

[0055] This multi-layer sealing structure design can better adapt to the complex working conditions during the operation of the twin-shaft mixer, such as shaft speed fluctuations, material impact, temperature changes, etc. Even in harsh working environments, the seals can cooperate with each other to play a sealing role, reduce the risk of leakage caused by failure of a single seal, and improve the reliability and stability of the equipment.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A novel twin-shaft mixer shaft head sealing method, characterized in that: The following steps are involved: (1) Assembly and preliminary fixing; (2) Seal installation; (3) Connection and fixing; (4) Operation and sealing; (5) Maintenance and disassembly.

2. A novel twin-shaft mixer shaft head sealing method according to claim 1, characterized in that: The step (1) is specifically as follows: pre-installing the first tooling flange (27) on the rotating hub threaded hole group (19) on the end face of the rotating hub (4) and the second threaded hole group (24) on the end face of the fixed hub (5) to ensure the initial fixation and alignment between the rotating hub (4) and the fixed hub (5); at the same time, pre-installing the second tooling flange (28) on the threaded holes on the end face of the outer protective ring (10) and the threaded holes on the end face of the inner protective ring (13); The outer protective ring (10) is mounted on the inner side of the fixed hub (5); the protective sleeve (11) is mounted on the inner side of the rotating hub (4); the sealing pressure ring (12) is mounted on the inner side of the protective sleeve (11); and the inner protective ring (13) is mounted on the inner side of the sealing pressure ring (12); the outer protective ring (10), the protective sleeve (11), the sealing pressure ring (12), and the inner protective ring (13) are all arranged in a half-split structure.

3. A novel twin-shaft mixer shaft head sealing method according to claim 1 or 2, characterized in that: The step (2) specifically comprises: installing the floating oil seal (6) in the floating oil seal groove (17) of the rotating hub (4) to form a seal between the rotating hub (4) and the fixed hub (5); the floating oil seal (6) can automatically adjust the degree of fit between the sealing lip and the sealing surface to adapt to the deflection and vibration of the main shaft and always maintain a stable sealing effect; The O-ring (14) is installed in the O-ring groove (20) of the rotating hub (4) to form a seal between the rotating hub (4) and the main shaft (3); the O-ring (14) forms a tight seal between the rotating hub (4) and the main shaft (3) by virtue of its own elasticity, thereby effectively preventing leakage of liquid and gas; A one-way oil seal (15) is installed in the middle of the fixed hub (5), and a rotary oil seal (16) is installed inside one end of the fixed hub (5); the one-way oil seal (15) and the rotary oil seal (16) respectively play a sealing role at different positions of the fixed hub (5), thereby enhancing the sealing performance of the entire shaft head area.

4. A novel twin-shaft mixer shaft head sealing method according to claim 1, characterized in that: The step (3) is specifically as follows: installing the connecting portion of the expansion cone sleeve (7) on the outer end of the rotating hub (4), the expansion portion of the expansion cone sleeve (7) being located between the rotating hub (4) and the main shaft (3), and fixing the rotating hub (4) on the main shaft (3) by the expansion action, thereby ensuring the stability and concentricity of the rotating hub (4) on the main shaft (3); The rotating hub (4) and the transparent cover (9) located outside the rotating hub (4) are connected by tension bolts (8), and the transparent cover (9) is fixed to the outer end of the fixed hub (5) at the same time; the transparent cover (9) and the outer protective ring (10) are fixed to the fixed hub (5) by bolts through the first threaded hole group (22) and the second threaded hole group (24) on the fixed hub (5); and a polished rod for connecting with the cylinder (1) passes through the interior of the polished hole group (21), thereby ensuring accurate positioning and stable connection between the fixed hub (5) and the cylinder (1).

5. A novel twin-shaft mixer shaft head sealing method according to claim 1, characterized in that: The step (4) is specifically as follows: during the operation of the mixer, four different types of seals, namely the floating oil seal (6), the O-ring (14), the one-way oil seal (15) and the rotary oil seal (16), cooperate with each other to form an all-round, multi-layered sealing system; the sleeve (11) is installed on the inner side of the rotating hub (4) to effectively protect the rotating hub (4) from wear; the outer protective ring (10), the sealing pressure ring (12) and the inner protective ring (13) are arranged in sequence to form a multi-layer sealing barrier, making it more difficult for materials and external impurities to enter the mixer through the shaft head, thereby enhancing the reliability of the seal.

6. A novel twin-shaft mixer shaft head sealing method according to claim 5, characterized in that: The step (5) is specifically as follows: first, the tensioning bolt (8) and the transparent cover (9) are disassembled, and then the outer protective ring (10), the protective sleeve (11), the sealing pressure ring (12) and the inner protective ring (13) are disassembled in sequence; since the outer protective ring (10), the protective sleeve (11), the sealing pressure ring (12) and the inner protective ring (13) are all arranged in a half-split structure, they are easy to disassemble and replace.

7. A novel twin-shaft mixer shaft head sealing method according to claim 6, characterized in that: A group of bearing seats (2) are installed in the middle of the cylinder (1); one end of the main shaft (3) is rotatably installed on the bearing seat (2), and the other end extends into the interior of the cylinder (1); a rotating hub (4) is sleeved on the periphery of the main shaft (3), and a fixed hub (5) is sleeved on the periphery of the rotating hub (4), and the fixed hub (5) is fixedly installed on the inner side of the middle of the cylinder (1); the connecting part of the expansion cone sleeve (7) is installed on the outer end of the rotating hub (4), and the expansion part of the expansion cone sleeve (7) is located between the rotating hub (4) and the main shaft (3), and is used to fix the rotating hub (4) on the main shaft (3); the tensioning bolt (8) is used to connect the rotating hub (4) and a transparent cover (9) located on the outer side of the rotating hub (4), and the transparent cover (9) is also fixed to the outer end of the fixed hub (5).

8. A novel twin-shaft mixer shaft head sealing method according to claim 7, characterized in that: A floating oil seal (6) is installed between the rotating hub (4) and the fixed hub (5); an O-ring (14) is installed between the rotating hub (4) and the main shaft (3); a one-way oil seal (15) is installed in the middle of the fixed hub (5), and a rotary oil seal (16) is installed inside one end of the fixed hub (5); the floating oil seal (6) is installed in a floating oil seal groove (17) to form a seal between the rotating hub (4) and the fixed hub (5); the O-ring (14) is installed in an O-ring groove (20) to form a seal between the rotating hub (4) and the main shaft (3).

9. A novel twin-shaft mixer shaft head sealing method according to claim 8, characterized in that: The rotating hub (4) is provided with a rotating hub floating oil seal groove (17), an inner conical surface (18), a rotating hub threaded hole group (19) and an O-ring groove (20). The floating oil seal groove (17) is located on the outer ring of the rotating hub (4) and is used to accommodate the floating oil seal (6). The inner conical surface (18) is located on the inner side of the rotating hub (4) and is matched with the expansion cone sleeve (7) to achieve a fixed connection between the rotating hub (4) and the main shaft (3), thereby ensuring the stability and concentricity of the rotating hub (4) on the main shaft (3). The rotating hub threaded hole group (19) is distributed on the end surface of the rotating hub (4) away from the inner conical surface (18) and is connected to the sealing pressure ring (12) by bolts. The O-ring groove (20) is located inside the rotating hub (4) and is used to install the O-ring (14). The O-ring (14) is tightly attached to the main shaft (3).

10. A novel twin-shaft mixer shaft head sealing method according to claim 8, characterized in that: The fixed hub (5) is provided with a light hole group (21), a first threaded hole group (22), an oil seal groove (23), a second threaded hole group (24), a fixed hub floating oil seal groove (25) and an oil seal groove (26); a light rod for connecting to the cylinder (1) passes through the inside of the light hole group (21); the first threaded hole group (22) is provided on one side of the fixed hub (5), and the transparent cover (9) is installed at the first threaded hole group (22) by bolts; the second threaded hole group (24) is provided on the other side of the fixed hub (5), and is connected to the outer protective ring (10) by bolts at the second threaded hole group (24); the fixed hub floating oil seal groove (25) is used to accommodate a floating oil seal (6) to ensure the sealing between the fixed hub (5) and the rotating hub (4); the first oil seal groove (23) is provided on one side of the fixed hub floating oil seal groove (25), and the second oil seal groove (26) is provided on the other side of the fixed hub floating oil seal groove (25).

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