A positioning mold and assembling equipment

CN224897046UActive Publication Date: 2026-10-27SHANDONG HONGXIN MASCH CO LTD
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Patent Information

Application Number
CN202522613679.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-12-09
Publication Date
2026-10-27
Estimated Expiration
2035-12-09

AI Technical Summary

Technical Problem

[0002]立式轴承座是工业设备中常见的轴承座支撑部件,主要用于垂直或近似垂直安装的轴系结构,立式轴承座分为分体式和非分体式两种类型,目前的立式轴承座很难将轴与两端轴承座安装、调整到理想状态

Benefits of technology

[0020]在上述实现的过程中,安装定位模具主要用于对轴承组件进行精准安装和定位,其中第一轴承模型连接于管轴的一端,并且与第一轴承座配套使用,第二轴承模型连接管轴的另一端,并且与第二轴承座配套使用,组装时将第一轴承座及第二轴承座放置于同一平台上,再将第一轴承模型放入第一轴承座内以及第二轴承模型放入第二轴承座内,最后将第一轴承座及第二轴承座固定于平台设定的位置后,调整好与相关轴的平行、距离等,加以稳固后逐步将轴承组件与机架或箱体焊牢,拆卸安装定位模具,由于第一轴承模型是以第一轴承座内孔为基准定位,第二轴承模型是以第二轴承座内孔为基准定位,有效控制了轴与第一轴承座及第二轴承座的同心度误差、以及第一轴承座与第二轴承座之间的距离误差,为安装后调整轴承的配合间隙创造了便利条件,有效克服因轴与轴承座孔不同心、轴承的配合间隙失当造成的轴承发热等缺陷。

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Abstract

The application provides a mounting and positioning mold and an assembling device. The mounting and positioning mold is used for mounting and positioning a bearing assembly. The mounting and positioning mold comprises a pipe shaft and a first bearing model. The first bearing model is arranged at one end of the pipe shaft and is connected with the pipe shaft. The bearing assembly comprises a first bearing seat. The first bearing model is used for being placed into the first bearing seat. The mounting and positioning mold is used for accurately mounting and positioning the bearing assembly. During the assembling, the first bearing seat is placed on a platform, the first bearing model is placed into the first bearing seat, and finally the first bearing seat is fixed on the platform and the mounting and positioning mold is disassembled. Since the first bearing model is positioned based on the inner hole of the first bearing seat, the concentricity error of the bearing and the first bearing seat is effectively controlled, a convenient condition is created for adjusting the fit clearance of the bearing after the mounting, and defects such as bearing heating caused by the different concentricity of the shaft and the bearing seat hole and the improper fit clearance of the bearing are effectively overcome.
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Description

Technical Field

[0001] This application relates to the field of mechanical equipment assembly technology, and more specifically, to an installation and positioning mold and assembly equipment. Background Technology

[0002] Vertical bearing housings are common bearing support components in industrial equipment. They are mainly used for shaft systems that are installed vertically or nearly vertically. Vertical bearing housings are divided into two types: split type and non-split type. Currently, it is difficult to install and adjust the shaft and the bearing housings at both ends to an ideal state using vertical bearing housings. Utility Model Content

[0003] The purpose of this application is to provide an installation and positioning mold and assembly equipment that can meet the installation accuracy requirements.

[0004] In a first aspect, embodiments of this application provide an installation and positioning mold for installing and positioning a bearing assembly. The installation and positioning mold includes a tube shaft and a first bearing model. The tube shaft is distributed along a first direction, the first bearing model is disposed at one end of the tube shaft, and the first bearing model is connected to the tube shaft. The bearing assembly includes a first bearing seat. The first bearing model is used to be placed inside the first bearing housing.

[0005] In the above process, the installation positioning mold is mainly used for the precise installation and positioning of the bearing assembly. The first bearing model is connected to one end of the tube shaft and is used in conjunction with the first bearing housing. During assembly, the first bearing housing is placed on a platform, the first bearing model is placed into the first bearing housing, and finally the first bearing housing is fixed on the platform before the installation positioning mold is disassembled. Since the first bearing model is positioned with the inner hole of the first bearing housing as the reference, the concentricity error between the bearing and the first bearing housing is effectively controlled, which creates convenient conditions for adjusting the bearing's fit clearance after installation. This effectively overcomes defects such as bearing overheating caused by misalignment between the shaft and the bearing housing hole and improper bearing fit clearance.

[0006] In some embodiments, the bearing assembly further includes a first end cap connected to the first bearing housing.

[0007] In the above process, after the first bearing model is placed into the first bearing housing, in order to prevent the first bearing housing from not being installed properly, the first end cover needs to be installed. After confirming that the bottom surface of the first bearing housing is completely in contact with the platform, the screws of the first end cover are tightened, so that the installation and positioning mold becomes a rigid whole, effectively controlling the concentricity error between the bearing and the first bearing housing.

[0008] In some embodiments, the first bearing model is welded to the tube shaft. This makes the mounting and positioning mold a rigid whole, effectively controlling the concentricity error between the bearing and the first bearing housing.

[0009] In some embodiments, the mounting and positioning mold further includes a second bearing model, which is disposed at the end of the tube shaft away from the first bearing model and is connected to the tube shaft; the bearing assembly includes a second bearing seat. The second bearing model is used to fit into the second bearing housing.

[0010] In the above process, the installation positioning mold is mainly used for precise installation and positioning of the bearing assembly. The first bearing model is connected to one end of the tube shaft and is used in conjunction with the first bearing housing. The second bearing model is connected to the other end of the tube shaft and is used in conjunction with the second bearing housing. During assembly, the first and second bearing housings are placed on the same platform, and then the first bearing model is placed into the first bearing housing and the second bearing model is placed into the second bearing housing. Finally, after fixing the first and second bearing housings in the positions set on the platform, the parallelism and distance with the relevant shafts are adjusted and stabilized. Then, the bearing assembly is gradually welded to the frame or housing. The installation positioning mold is then disassembled and installed. Since the first bearing model is positioned with the inner hole of the first bearing housing as the reference, and the second bearing model is positioned with the inner hole of the second bearing housing as the reference, the concentricity error between the shaft and the first and second bearing housings, as well as the distance error between the first and second bearing housings, are effectively controlled. This creates convenient conditions for adjusting the bearing clearance after installation and effectively overcomes defects such as bearing overheating caused by misalignment between the shaft and the bearing housing hole and improper bearing clearance.

[0011] In some embodiments, the bearing assembly further includes a second end cap connected to the second bearing housing.

[0012] In the above process, after the second bearing model is placed into the second bearing housing, in order to prevent the second bearing housing from not being installed properly, the second end cover needs to be installed. After confirming that the bottom surface of the second bearing housing is completely in contact with the platform, the screws of the second end cover are tightened, so that the installation and positioning mold becomes a rigid whole, effectively controlling the concentricity error between the shaft and the second bearing housing.

[0013] In some embodiments, the second bearing model is welded to the tube shaft. This makes the mounting and positioning mold a rigid whole, effectively controlling the concentricity error between the shaft and the second bearing housing.

[0014] In some embodiments, a first limiting ring is provided on the side of the tube shaft near the first bearing model, and the first limiting ring is spaced apart from the first bearing model.

[0015] In the above implementation process, a first limiting ring is set on the tube shaft according to the distance and diameter of the shaft outlet hole of the housing, which is beneficial for use in housing-type equipment and improves the applicability of the product.

[0016] In some embodiments, a second limiting ring is provided on the side of the tube shaft near the second bearing model. The second limiting ring is spaced apart from the second bearing model and is located between the first limiting ring and the second bearing model.

[0017] In the above implementation process, based on the distance and diameter of the shaft outlet holes on both sides of the housing, a first limiting ring and a second limiting ring are set on the tube shaft, which is beneficial for use in housing-type equipment and improves the applicability of the product.

[0018] In some embodiments, the tube shaft is hollow. Its structure is simple, reducing weight, lowering manufacturing costs, and making it easy to use. Combined with the first and second bearing models on the tube shaft, it can significantly improve installation quality and work efficiency.

[0019] Secondly, this application also provides an assembly device, including an installation and positioning mold as described in any of the above claims.

[0020] In the above process, the installation positioning mold is mainly used for precise installation and positioning of the bearing assembly. The first bearing model is connected to one end of the tube shaft and is used in conjunction with the first bearing housing. The second bearing model is connected to the other end of the tube shaft and is used in conjunction with the second bearing housing. During assembly, the first and second bearing housings are placed on the same platform, and then the first bearing model is placed into the first bearing housing and the second bearing model is placed into the second bearing housing. Finally, after fixing the first and second bearing housings in the positions set on the platform, the parallelism and distance with the relevant shafts are adjusted and stabilized. Then, the bearing assembly is gradually welded to the frame or housing. The installation positioning mold is then disassembled and installed. Since the first bearing model is positioned with the inner hole of the first bearing housing as the reference, and the second bearing model is positioned with the inner hole of the second bearing housing as the reference, the concentricity error between the shaft and the first and second bearing housings, as well as the distance error between the first and second bearing housings, are effectively controlled. This creates convenient conditions for adjusting the bearing clearance after installation and effectively overcomes defects such as bearing overheating caused by misalignment between the shaft and the bearing housing hole and improper bearing clearance.

[0021] Other features and advantages of this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described techniques of this application.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the installation and positioning mold provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the installation and positioning mold and the bearing assembly provided in the embodiments of this application.

[0025] Attached Figure

[0026] 1. Install positioning mold; 101. Tube shaft; 102. First bearing model; 103. Second bearing model; 104. First limiting ring; 105. Second limiting ring; 2. Bearing assembly; 201. First bearing seat; 202. First end cap; 203. Second bearing seat; 204. Second end cap. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0029] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0030] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0031] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more. Example

[0032] For many years, most general-grade mechanical equipment has used self-aligning bearings because these bearings have lower requirements for the concentricity and positional accuracy of the bearing housing at the shaft end. In particular, the mounting base surface of vertical bearing housings is not even machined, making it difficult to install and adjust the shaft and the bearing housings at both ends to an ideal state. If the adjustment is not made properly, phenomena such as bearing overheating, abnormal noise, and vibration may occur.

[0033] In view of this, such as Figures 1-2 As shown, in a first aspect, this application provides an installation positioning mold 1 for installing and positioning a bearing assembly 2. The installation positioning mold 1 includes a tube shaft 101 and a first bearing model 102. The tube shaft 101 is distributed along a first direction (including but not limited to the up and down direction). The first bearing model 102 is disposed at one end of the tube shaft 101 and is connected to the tube shaft 101. The bearing assembly 2 includes a first bearing seat 201. The first bearing model 102 is used to be placed inside the first bearing housing 201.

[0034] In this application, to solve the aforementioned technical problems, an installation positioning mold 1 is provided. This installation positioning mold 1 can meet the installation accuracy requirements of self-aligning bearings, vertical bearings, split bearings, etc. A self-aligning bearing, as the name suggests, is a rolling bearing capable of automatically adjusting its center. Its design allows for a certain angular deviation between the inner ring, rolling elements, and outer ring, thereby compensating for misalignment caused by installation errors, shaft bending, or frame deformation. The self-aligning principle is as follows: when the shaft bends or misalignment occurs, the inner ring tilts along with the shaft. However, because the outer ring raceway is spherical, the rolling elements can adaptively adjust their position on this spherical raceway, ensuring normal bearing operation and preventing additional stress concentration. A vertical bearing housing, more commonly referred to as a "mounted bearing" or "bearing housing unit," is a modular unit in which a rolling bearing is pre-installed within a specific housing. This housing is designed to be installed vertically on a flat base. "Vertical" refers to the installation method, i.e., the base plane is parallel to the shaft centerline, and the housing body is perpendicular to the installation plane. The vertical bearing housing primarily provides a robust, sealed, and easy-to-install space for self-aligning bearings.

[0035] The installation and positioning mold 1 is mainly used to replace the bearing. The bearing is assembled after being welded and painted as a whole. Specifically, the first bearing model 102 is set on the tube shaft 101, and the first bearing model 102 cooperates with the first bearing seat 201 to realize the installation and positioning of the first bearing seat 201. The outer diameter, width and other parameters of the first bearing model 102 are the same as those of the selected bearing, and the outer diameter of the tube shaft 101 is slightly smaller than the diameter of the through hole of the first bearing seat 201.

[0036] In the above implementation process, the installation positioning mold 1 is mainly used for the precise installation and positioning of the bearing assembly 2. The first bearing model 102 is connected to one end of the tube shaft 101 and is used in conjunction with the first bearing seat 201. During assembly, the first bearing seat 201 is placed on a platform, and then the first bearing model 102 is placed into the first bearing seat 201. Finally, the first bearing seat 201 is fixed on the platform and the installation positioning mold 1 is disassembled. Since the first bearing model 102 is positioned with the inner hole of the first bearing seat 201 as the reference, the concentricity error between the bearing and the first bearing seat 201 is effectively controlled, which creates convenient conditions for adjusting the bearing's fit clearance after installation. This effectively overcomes defects such as bearing overheating caused by misalignment between the shaft and the bearing seat hole and improper bearing fit clearance.

[0037] like Figure 2As shown, the bearing assembly 2 also includes a first end cap 202, which is connected to the first bearing seat 201. For example, the first end cap 202 is fixed to the first bearing seat 201 by screws. The first end cap 202 is located on the outside of the first bearing seat 201. After the first bearing model 102 is placed into the first bearing seat 201 and installed in place, the first end cap 202 is fixed to the first bearing seat 201 and the screws are tightened appropriately.

[0038] In the above implementation process, after the first bearing model 102 is placed into the first bearing seat 201, in order to prevent the first bearing seat 201 from not being installed properly, the first end cover 202 needs to be installed. After confirming that the bottom surface of the first bearing seat 201 is completely in contact with the platform, the screws of the first end cover 202 are tightened, so that the installation and positioning mold 1 becomes a rigid whole, effectively controlling the concentricity error between the bearing and the first bearing seat 201.

[0039] In some embodiments, the first bearing model 102 is welded to the tube shaft 101. This makes the mounting and positioning mold 1 a rigid whole, effectively controlling the concentricity error between the bearing and the first bearing housing 201.

[0040] In some embodiments, the mounting and positioning mold 1 further includes a second bearing model 103, which is disposed at one end of the tube shaft 101 away from the first bearing model 102 and is connected to the tube shaft 101. The bearing assembly 2 includes a second bearing seat 203. The second bearing model 103 is used to be placed inside the second bearing housing 203. The second bearing model 103 has the same outer diameter, width and other parameters as the selected bearing. The distance between the first bearing model 102 and the second bearing model 103 is equal to the distance between the two shoulders on the shaft.

[0041] In the above implementation process, the installation and positioning mold 1 is mainly used for precise installation and positioning of the bearing assembly 2. The first bearing model 102 is connected to one end of the tube shaft 101 and is used in conjunction with the first bearing housing 201. The second bearing model 103 is connected to the other end of the tube shaft 101 and is used in conjunction with the second bearing housing 203. During assembly, the first bearing housing 201 and the second bearing housing 203 are placed on the same platform, then the first bearing model 102 is placed into the first bearing housing 201 and the second bearing model 103 is placed into the second bearing housing 203. Finally, the first bearing housing 201 and the second bearing housing 203 are fixed in the positions set on the platform. After adjusting the parallelism and distance with the relevant shafts, and stabilizing them, the bearing assembly 2 is gradually welded to the frame or housing. The positioning mold 1 is then disassembled and installed. Since the first bearing model 102 is positioned with the inner hole of the first bearing seat 201 as the reference, and the second bearing model 103 is positioned with the inner hole of the second bearing seat 203 as the reference, the concentricity error between the shaft and the first bearing seat 201 and the second bearing seat 203, as well as the distance error between the first bearing seat 201 and the second bearing seat 203, are effectively controlled. This creates convenient conditions for adjusting the bearing clearance after installation and effectively overcomes defects such as bearing overheating caused by misalignment between the shaft and the bearing seat hole and improper bearing clearance.

[0042] In some embodiments, the bearing assembly 2 further includes a second end cap 204, which is connected to the second bearing housing 203. For example, the second end cap 204 is fixed to the second bearing housing 203 by screws. The second end cap 204 is located on the outside of the second bearing housing 203. After the second bearing model 103 is placed into the second bearing housing 203 and installed in place, the second end cap 204 is fixed to the second bearing housing 203 and the screws are tightened appropriately.

[0043] In the above implementation process, after the second bearing model 103 is placed into the second bearing seat 203, in order to prevent the second bearing seat 203 from not being installed properly, the second end cover 204 needs to be installed. After confirming that the bottom surface of the second bearing seat 203 is completely in contact with the platform, the screws of the second end cover 204 are tightened, so that the installation positioning mold 1 becomes a rigid whole, effectively controlling the concentricity error between the shaft and the second bearing seat 203.

[0044] In some embodiments, the second bearing model 103 is welded to the tube shaft 101. This makes the mounting and positioning mold 1 a rigid whole, effectively controlling the concentricity error between the shaft and the second bearing housing 203.

[0045] In some embodiments, a first limiting ring 104 is provided on the side of the tube shaft 101 near the first bearing model 102, and the first limiting ring 104 is distributed at intervals with the first bearing model 102.

[0046] In the above implementation process, a first limiting ring 104 is set on the tube shaft 101 according to the distance and diameter of the shaft outlet hole of the housing, which is beneficial for use in housing-type equipment and improves the applicability of the product.

[0047] like Figures 1-2 As shown, a second limiting ring 105 is provided on the side of the tube shaft 101 near the second bearing model 103. The second limiting ring 105 is spaced apart from the second bearing model 103, and the second limiting ring 105 is located between the first limiting ring 104 and the second bearing model 103. If it is a box-type device, the first limiting ring 104 and the second limiting ring 105 are used in conjunction with the shaft outlet hole on the box for positioning, so that the mounting base plates of the first bearing seat 201 and the second bearing seat 203 are parallel to the equipment base.

[0048] In the above implementation process, based on the distance and diameter of the shaft holes on both sides of the housing, a first limiting ring 104 and a second limiting ring 105 are set on the tube shaft 101, which is beneficial for use in housing-type equipment and improves the applicability of the product.

[0049] In some embodiments, the tube shaft 101 is hollow. It has a simple structure, light weight, low manufacturing cost, and is easy to use. Combined with the first bearing model 102 and the second bearing model 103 on the tube shaft 101, it can significantly improve installation quality and work efficiency.

[0050] Secondly, this application also provides an assembly device, including the mounting and positioning mold 1 as described above.

[0051] In the above implementation process, the installation and positioning mold 1 is mainly used for precise installation and positioning of the bearing assembly 2. The first bearing model 102 is connected to one end of the tube shaft 101 and is used in conjunction with the first bearing housing 201. The second bearing model 103 is connected to the other end of the tube shaft 101 and is used in conjunction with the second bearing housing 203. During assembly, the first bearing housing 201 and the second bearing housing 203 are placed on the same platform, then the first bearing model 102 is placed into the first bearing housing 201 and the second bearing model 103 is placed into the second bearing housing 203. Finally, the first bearing housing 201 and the second bearing housing 203 are fixed in the positions set on the platform. After adjusting the parallelism and distance with the relevant shafts, and stabilizing them, the bearing assembly 2 is gradually welded to the frame or housing. The positioning mold 1 is then disassembled and installed. Since the first bearing model 102 is positioned with the inner hole of the first bearing seat 201 as the reference, and the second bearing model 103 is positioned with the inner hole of the second bearing seat 203 as the reference, the concentricity error between the shaft and the first bearing seat 201 and the second bearing seat 203, as well as the distance error between the first bearing seat 201 and the second bearing seat 203, are effectively controlled. This creates convenient conditions for adjusting the bearing clearance after installation and effectively overcomes defects such as bearing overheating caused by misalignment between the shaft and the bearing seat hole and improper bearing clearance.

[0052] In all embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0053] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0054] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. An installation and positioning mold, characterized in that, The installation and positioning mold is used for the installation and positioning of the bearing assembly. The installation and positioning mold includes: a tube shaft and a first bearing model. The tube shaft is distributed along a first direction. The first bearing model is disposed at one end of the tube shaft and is connected to the tube shaft. The bearing assembly includes a first bearing seat. The first bearing model is used to be placed inside the first bearing housing.

2. The installation and positioning mold according to claim 1, characterized in that, The bearing assembly further includes a first end cap, which is connected to the first bearing housing.

3. The installation and positioning mold according to claim 1, characterized in that, The first bearing model is welded to the tube shaft.

4. The installation and positioning mold according to claim 1, characterized in that, The installation and positioning mold further includes a second bearing model, which is disposed at the end of the tube shaft away from the first bearing model and is connected to the tube shaft. The bearing assembly includes a second bearing seat. The second bearing model is used to fit into the second bearing housing.

5. The installation and positioning mold according to claim 4, characterized in that, The bearing assembly further includes a second end cap, which is connected to the second bearing housing.

6. The installation and positioning mold according to claim 4, characterized in that, The second bearing model is welded to the tube shaft.

7. The installation and positioning mold according to any one of claims 4-6, characterized in that, A first limiting ring is provided on the side of the tube shaft near the first bearing model, and the first limiting ring is distributed at intervals with the first bearing model.

8. The installation and positioning mold according to claim 7, characterized in that, A second limiting ring is provided on the side of the tube shaft near the second bearing model. The second limiting ring is spaced apart from the second bearing model and is located between the first limiting ring and the second bearing model.

9. The installation and positioning mold according to claim 8, characterized in that, The tube shaft is hollow.

10. An assembly device, characterized in that, Including the installation and positioning mold as described in any one of claims 1-9.