Method for adjusting axial clearance of output shaft system of gearbox of single-screw extruder and method for assembling single-screw extruder

Abstract

An axial clearance adjusting method of a gearbox output shaft system of a single-screw extruder and an assembling method of the single-screw extruder relate to the field of machining and manufacturing of mechanical equipment.The axial clearance adjusting method comprises the steps that the gearbox output shaft system is installed on a positioning tool in a suspended mode, and an outer ring of a second bearing makes contact with an inner side datum plane of the positioning tool; a positioning assembly is installed on the outer side datum plane of the positioning tool, and the positioning assembly is made to make contact with the outer ring of the first bearing; force is applied to the output gear shaft, the gear box output shaft system is lifted, the gear box output shaft system is made to be away from the inner side datum plane, and the axial displacement of the output gear shaft system is measured; comparing the measured value of the axial displacement with the standard axial clearance of the output shaft system of the gearbox; and when the measured value of the axial displacement does not meet the requirement of the standard axial clearance, adjusting the size of the positioning assembly, and repeating the steps s200-s400 until the measured value of the axial displacement meets the requirement of the standard axial clearance. Gap adjustment difficulty is low, efficiency is high, and safety is high.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment processing and manufacturing, and in particular to a method for adjusting the axial clearance of an output shaft system of a single-screw extruder gear box and a method for assembling a single-screw extruder. Background Art

[0002] The gearbox of rubber single screw extruder is a key equipment for the manufacture of rubber tires and products. The whole machine is generally composed of a motor, a gearbox, a screw, a barrel and a die. One end of the barrel is connected to the flange of the output end of the gearbox, and the other end is connected to the die. The two ends of the screw are supported by the inner hole of the output shaft of the gearbox and the die. The aspect ratio of the screw and the barrel is large, the length is very long, and the gap between the circumferences of the two is very small. If the coaxiality error between the screw and the barrel is large, it will cause interference and boring between the screw and the barrel. Therefore, in order to ensure the coaxiality requirements of the barrel and the screw and avoid boring, the positioning parts of the barrel and the screw and the positioning parts connected to the output end of the gearbox are required to have high precision. The accuracy of the gearbox parts can be guaranteed in the design and processing stages, and the accuracy of the interface size of the connection part needs to be adjusted and guaranteed during the assembly stage of the gearbox.

[0003] The inventors found in their research that the prior art method for regulating the axial clearance of the output shaft system of the single-screw extruder gearbox has at least the following disadvantages:

[0004] Due to the heavy weight of the output shaft system and the special structure of the three bearings on it, when the box and the shaft system are placed horizontally, the bearing preload cannot meet the requirements of the drawing design, or it can only meet the illusion of meeting the requirements. Therefore, in actual use, it will cause bearing damage, abnormal noise, screw boring and other abnormal conditions, and cannot be used normally. In addition, in order to improve the accuracy of axial clearance adjustment, in some occasions, the box and the shaft system are flipped 90° to be arranged vertically. Due to the heavy weight of the box and the shaft system, it is difficult to flip, time-consuming and labor-intensive, and inefficient; and after flipping, the center of gravity is high, horizontal adjustment is inconvenient, and it is not easy to ensure the coaxiality of the shaft system. In addition, the overall structural stability is poor, and there are safety hazards such as tipping. Summary of the invention

[0005] The objects of the present invention include, for example, providing a method for adjusting the axial clearance of the output shaft system of a single-screw extruder gearbox and a single-screw extruder assembly method, which can adjust the axial clearance of the output shaft system without flipping the gearbox as a whole, thereby reducing the difficulty of operation, reducing safety hazards, improving operating efficiency, and enabling the gearbox to meet design requirements.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides an axial clearance adjustment method for a single-screw extruder gearbox output shaft system, wherein the gearbox output shaft system comprises an output gear shaft, a first bearing and a second bearing, wherein the inner rings of the first bearing and the second bearing are both sleeved outside the output gear shaft; the clearance adjustment method comprises the following steps:

[0008] Step s100: installing the gearbox output shaft system on a positioning fixture in a suspended manner, so that the outer ring of the second bearing, which is away from the first bearing, contacts the inner reference surface of the positioning fixture, so that the weight of the gearbox output shaft system acts on the inner reference surface through the outer ring of the second bearing;

[0009] Step s200: installing a positioning assembly on the outer reference surface of the positioning fixture, so that the positioning assembly contacts the side of the outer ring of the first bearing away from the second bearing; the outer ring of the first bearing and the outer ring of the second bearing are restricted to move away from each other by the cooperation of the positioning assembly and the inner reference surface; the distance between the outer reference surface and the inner reference surface is L1, and the distance between the first positioning surface of the gear box body matched with the gear box output shaft system for installing the positioning assembly and the second positioning surface for installing the outer ring of the second bearing is L2, L1=L2;

[0010] Step s300: applying force to the output gear shaft and lifting the gearbox output shaft system, so that the gearbox output shaft system has a tendency to move away from the inner reference plane, and measuring the axial displacement of the output gear shaft system;

[0011] Step s400: comparing the measured value of the axial displacement with the standard axial clearance of the gearbox output shaft system; when the measured value of the axial displacement does not meet the requirement of the standard axial clearance, adjusting the size of the positioning assembly and repeating steps s200-s400 until the measured value of the axial displacement meets the requirement of the standard axial clearance.

[0012] In an optional embodiment, the positioning assembly includes a transparent cover and an adjustment ring; in the step s200, the step of installing the positioning assembly on the outer reference surface of the positioning tool includes:

[0013] First, the adjusting ring is sleeved on the outside of the output gear shaft so that the adjusting ring contacts the side of the outer ring of the first bearing away from the second bearing, and then the transparent cover is matched with the outer reference surface so that the transparent cover contacts the side of the adjusting ring away from the first bearing.

[0014] In an optional implementation, in the step s400, when the measured value of the axial displacement does not meet the requirement of the standard axial clearance, the size of the transparent cover or the adjustment ring is adjusted.

[0015] In an optional embodiment, between step s100 and step s200, the step further includes adjusting the horizontality of the positioning tool so that the inner reference surface is set horizontally.

[0016] In an optional embodiment, between step s200 and step s300, the method further includes installing an indicator meter on the positioning fixture, bringing the pointer of the indicator meter into contact with the top end face of the output gear shaft, and measuring the axial displacement using the indicator meter.

[0017] In an optional embodiment, between step s100 and step s200, the output gear shaft is also included, and the axis of the gear box output shaft system and the axis of the positioning tool are automatically aligned by rotating the output gear shaft, utilizing the deadweight of the gear box output shaft system and the automatic alignment characteristics of the first bearing and the second bearing.

[0018] In an optional embodiment, in the s300, force is applied to the output gear shaft along the axial direction of the output gear shaft to lift the gearbox output shaft system.

[0019] In a second aspect, the present invention provides a method for assembling a single screw extruder, the method comprising:

[0020] A method for adjusting the axial clearance of a single-screw extruder gearbox output shaft system according to any one of the aforementioned embodiments.

[0021] In an optional embodiment, the following steps are also included: installing the gearbox output shaft system on the gearbox body, and installing a positioning assembly whose axial displacement meets the standard axial clearance requirements on the gearbox body, and then installing the screw on the output gear shaft, and then installing the barrel on the output port of the gearbox body.

[0022] In an optional embodiment, before installing the barrel on the output port, it also includes processing an inner stop on the end face of the output port so that the axis of the inner stop is moved downward relative to the axis of the assembly hole of the gear box body for penetrating the output gear shaft; and then inserting the barrel into the inner stop.

[0023] The beneficial effects of the embodiments of the present invention include, for example:

[0024] To sum up, the method for adjusting the axial clearance of the output shaft system of the single-screw extruder gear box provided in this embodiment designs a positioning tool, and uses the positioning tool to replace the gear box body to accurately position the output shaft system of the gear box. Since the positioning tool has a simple structure and light weight, after the positioning tool is matched with the output shaft system of the gear box, the overall structure is light and easy to flip, and it is easy to position and adjust the level after flipping. By adjusting the matching relationship between the gear shaft output shaft system and the positioning tool, the axial size of the gear box output shaft system can be adjusted. The entire operation process is convenient and flexible, saving time and effort, and has high operating efficiency and high safety. At the same time, the matching relationship between the positioning fixture and the gearbox output shaft system is equivalent to the matching relationship between the gearbox body and the gearbox output shaft system. After the shaft system clearance of the output shaft system is adjusted on the positioning fixture, the positioning assembly and the gearbox output shaft system are reinstalled on the gearbox body. This can ensure that the axial clearance of the gearbox output shaft system meets the design requirements, thereby ensuring that after the screw, barrel and head are matched with the gearbox, the screw and barrel have high coaxiality, the bearings are not easily worn, and the screw is not prone to boring when rotating, with low noise and stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of a method for adjusting the axial clearance of a single-screw extruder gearbox output shaft system according to an embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of the installation of the output shaft system and the gearbox body of the single screw extruder gearbox according to an embodiment of the present application;

[0028] Figure 3 Schematic diagram of a single screw extruder according to an embodiment of the present application.

[0029] icon:

[0030] 001-output gear shaft; 011-first end; 012-second end; 002-first bearing; 003-second bearing; 004-gearbox body; 041-inner stop; 005-barrel; 006-screw; 007-machine head; 100-positioning fixture; 101-center hole; 102-inner reference surface; 103-outer reference surface; 200-positioning assembly; 210-transparent cover; 220-adjusting ring; 300-indicator gauge. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0036] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0037] In the prior art, the gearbox is a high-precision device, and the axial clearance adjustment requirements of the output shaft system are very strict. The output shaft system of the gearbox is generally placed horizontally during assembly. The gearbox has a wide range of applications. For example, it is used in rubber single-screw extruders. Due to the structural characteristics of the extruder, the output shaft system of the gearbox is very heavy. Due to the axial structural characteristics of the spherical roller bearing supporting the output gear shaft 001, the axial clearance is large, and it is very difficult to adjust the output shaft system in the horizontal direction to meet the design requirements of the axial clearance. In the prior art, in order to solve the problem of difficult adjustment, the entire gearbox needs to be flipped 90 degrees, but the weight of the entire gearbox is very heavy, and it is very difficult to flip it on site. At the same time, the gearbox cannot be fixed and adjusted to a level after being flipped, and safety cannot be guaranteed.

[0038] In view of this, the designer provides a method for adjusting the axial clearance of the output shaft system of a single-screw extruder gearbox, which can reduce the difficulty of adjusting the axial clearance of the output shaft system, reduce the processing difficulty, improve the processing efficiency, and improve the processing safety.

[0039] It should be understood that the gap adjustment method of this embodiment is mainly applied to the adjustment of the gear box of a single-screw extruder. Obviously, in other embodiments, it can also be applied to the adjustment of the axial gap of the output shaft system of other gear boxes.

[0040] It is worth noting that, in this embodiment, the gearbox output shaft system includes an output gear shaft 001, a first bearing 002, and a second bearing 003. The output gear shaft 001 includes a first end 011 and a second end 012 arranged in its axial direction, and the inner rings of the first bearing 002 and the second bearing 003 are both sleeved on the outside of the output gear shaft 001, the first bearing 002 is close to the first end 011, and the second bearing 003 is close to the second end 012. During the clearance adjustment process, when the output gear shaft 001 is vertically arranged, the first end 011 can be understood as the top end, and correspondingly, the second end 012 can be understood as the bottom end.

[0041] Please refer to Figure 1 and Figure 2 This embodiment provides a method for adjusting the axial clearance of the output shaft system of a single-screw extruder gearbox, and the clearance adjustment method comprises the following steps:

[0042] Step s100, the output shaft of the gearbox is installed on the positioning fixture 100 in a suspended manner, so that the outer ring of the second bearing 003, which is away from the side of the first bearing 002, contacts the inner reference surface 102 of the positioning fixture 100, so that the weight of the output shaft of the gearbox acts on the inner reference surface 102 through the outer ring of the second bearing 003;

[0043] Step s200, installing the positioning assembly 200 on the outer reference surface 103 of the positioning fixture 100, so that the positioning assembly 200 contacts the side of the outer ring of the first bearing 002 away from the second bearing 003; the outer ring of the first bearing 002 and the outer ring of the second bearing 003 are limited to be away from each other by the cooperation of the positioning assembly 200 and the inner reference surface 102; the distance between the outer reference surface 103 and the inner reference surface 102 is L1, and the distance between the first positioning surface of the gear box body 004 matched with the gear box output shaft system for installing the positioning assembly 200 and the second positioning surface for installing the outer ring of the second bearing 003 is L2, L1=L2;

[0044] Step s300, applying force to the output gear shaft 001 and lifting the output shaft system of the gear box, so that the output shaft system of the gear box has a tendency to move away from the inner reference surface 102, and measuring the axial displacement of the output gear shaft system;

[0045] Step S400: Compare the axial displacement with the standard axial clearance of the gearbox output shaft system; when the axial displacement does not meet the requirements of the standard axial clearance, adjust the size of the positioning component 200, and repeat steps S200 - S400 until the axial displacement meets the requirements of the standard axial clearance. That is, when the axial displacement does not meet the requirements of the standard axial clearance, disassemble the positioning component 200, adjust the size of the positioning component 200, then install the adjusted positioning component 200 on the positioning tooling 100 to limit the positions of the first bearing 002 and the second bearing 003. Then apply force to the output gear shaft 001 to lift the entire output shaft system, measure the axial displacement of the output gear shaft, and the axial displacement of the output gear shaft is the axial displacement of the output shaft system. Compare the measured value of the axial displacement after measurement with the standard axial clearance. If the requirements are met, it indicates that the size of the positioning component 200 is appropriate.

[0046] As described above, the method for adjusting the axial clearance of the gearbox output shaft system of the single - screw extruder provided in this embodiment has at least the following advantages:

[0047] By designing the positioning tooling 100 and using the positioning tooling 100 to replace the gearbox body 004 to accurately position the gearbox output shaft system. Since the structure of the positioning tooling 100 is simple and its weight is light, after the positioning tooling 100 is combined with the gearbox output shaft system, the overall structure is light in weight, convenient for flipping, and convenient for positioning and adjusting the level after flipping; by adjusting the cooperation relationship between the gear shaft output shaft system and the positioning tooling 100, the adjustment of the axial dimension of the gearbox output shaft system can be realized. The whole operation process is convenient, flexible, time - saving, labor - saving, with high operation efficiency and high safety. At the same time, the cooperation relationship between the positioning tooling 100 and the gearbox output shaft system is the same as the cooperation relationship between the gearbox body 004 and the gearbox output shaft system. When the shaft system clearance of the gearbox output shaft system is adjusted on the positioning tooling 100, that is, the size of the positioning component 200 is determined, and then the positioning component 200 and the gearbox output shaft system are reinstalled on the gearbox body 004, it can ensure that the axial clearance of the gearbox output shaft system meets the design requirements, so as to ensure that after the screw 006, the barrel 005 and the head 007 are combined with the gearbox, the coaxiality between the screw 006 and the barrel 005 is high, the bearing is not easily worn, the screw 006 is not easily subjected to situations such as boring during rotation, the noise is small, and the operation is stable and reliable.

[0048] The following embodiments will illustrate the details of the method for adjusting the axial clearance of the gearbox output shaft system of the single - screw extruder of the present application by way of examples.

[0049] In this embodiment, optionally, before step s100, the positioning fixture 100 may be processed first so that the size of the positioning fixture 100 is consistent with the size of part of the gearbox body 004. Specifically, the positioning fixture 100 is provided with a center hole 101, and the center hole 101 is a stepped hole, and an annular inner reference surface 102 is formed on the inner side of the stepped hole. At the same time, the end surface of the hole section with a larger aperture of the stepped hole is a plane, which can be called the outer reference surface 103. The inner reference surface 102 is parallel to the outer reference surface 103, and both are arranged perpendicular to the axis of the center hole 101. During assembly, the output gear shaft 001 penetrates the center hole 101 from the side of the outer reference surface 103 and passes out from the side of the inner reference surface 102. It should be understood that since the positioning fixture 100 is partially consistent with the gearbox body 004, after adjusting the axial dimension of the output shaft system using the positioning fixture 100, the output shaft system is directly assembled to the gearbox body 004, which can ensure that the axial dimension of the output shaft system meets the design requirements.

[0050] In this embodiment, optionally, the positioning assembly 200 includes a transparent cover 210 and an adjustment ring 220. Both the transparent cover 210 and the adjustment ring 220 are annular structures, and the transparent cover 210 can be connected to the positioning fixture 100 or the gear box body 004 by fasteners such as bolts. In step s200, the steps of installing the positioning assembly 200 on the outer reference surface 103 of the positioning fixture 100 include:

[0051] First, the adjusting ring 220 is sleeved on the outside of the output gear shaft 001, so that the adjusting ring 220 contacts the side of the outer ring of the first bearing 002 away from the second bearing 003, and then the transparent cover 210 is matched with the outer reference surface 103, and the transparent cover 210 is fixed to the positioning fixture 100 by bolts, and the transparent cover 210 contacts the side of the adjusting ring 220 away from the first bearing 002. In this way, the transparent cover 210 and the adjusting ring 220 can cooperate to position the outer ring of the first bearing 002 and prevent the outer ring of the first bearing 002 from being away from the second bearing 003. At the same time, due to the design of the inner reference surface 102, the outer ring of the second bearing 003 is positioned, so that the freedom of the outer rings of the first bearing 002 and the second bearing 003 to move away from each other is limited. Since the position of the inner reference surface 102 does not change, by adjusting the thickness of the transparent cover 210 or the adjusting ring 220, the distance between the adjusting ring 220 and the inner reference surface 102 can be adjusted, thereby adjusting the axial clearance between the first bearing 002 and the second bearing 003, thereby achieving the adjustment of the axial clearance of the gearbox output shaft system.

[0052] That is to say, in step S400, when the axial displacement does not meet the requirements of the standard axial clearance, the size of the gland 210 or the adjusting ring 220 is adjusted. For example, when the measured value of the axial displacement is less than the standard axial clearance, at this time, the size of the gland 210 or the adjusting ring 220 is thinned to increase the movement space, thereby increasing the axial displacement. When the measured value of the axial displacement is greater than the standard axial clearance, the size of the gland 210 or the adjusting ring 220 is increased, thereby reducing the axial displacement, and the adjustment is convenient and flexible. Since the gland 210 is heavy and the adjusted thickness remains unchanged, generally, only the thickness of the adjusting ring 220 needs to be adjusted. In addition, the number of the adjusting rings 220 is not limited to one, and there can also be multiple adjusting rings 220 arranged in an overlapping manner. By changing the number of the adjusting rings 220, the adjustment of the axial clearance of the output shafting can also be achieved.

[0053] In this embodiment, optionally, between step S100 and step S200, it further includes adjusting the levelness of the positioning tooling 100 so that the inner reference surface 102 is horizontally arranged. When the output shafting is installed on the positioning tooling 100, the positioning tooling 100 can be placed on the workbench, and gaskets can be arranged between the positioning tooling 100 and the workbench. The levelness of the positioning tooling 100 is adjusted by the thickness and position of the gaskets. When obtaining the levelness of the positioning tooling 100, a spirit level can be used for measurement, which is convenient for operation. And, in order to improve the stability of the positioning tooling 100, the positioning tooling 100 can be pressed tightly on the workbench by a counterweight. In this way, when the output shafting is lifted, the position of the positioning tooling 100 is stable and will not rise together with the output shafting, improving the accuracy of the axial displacement.

[0054] Optionally, between step S100 and step S200, it further includes rotating the output gear shaft 001, and making the axis of the gearbox output shafting automatically align with the axis of the positioning tooling 100 by using the self-weight of the gearbox output shafting and the automatic centering characteristics of the first bearing 002 and the second bearing 003.

[0055] It should be understood that between step S200 and step S300, it further includes installing an indicating gauge 300 on the positioning tooling 100, contacting the pointer of the indicating gauge 300 with the top end face of the output gear shaft 001, and measuring the axial displacement by using the indicating gauge 300. The indicating gauge 300 can be a dial indicator or a micrometer etc. After the gearbox output shafting is matched with the positioning tooling 100 by using the positioning assembly 200, the indicating gauge 300 is adjusted to make its reading zero. Then, during the process of lifting the gearbox output shafting by using the lifting device, when the reading of the indicating gauge 300 remains unchanged, it indicates that the axial displacement of the output shafting has reached the maximum value. At this time, the lifting process is completed, and the lifting device can directly obtain the parameter of the axial displacement.

[0056] It is worth noting that in s300, a force F is applied to the output gear shaft 001 along the axial direction of the output gear shaft 001 to lift the output shaft system of the gearbox, so that the output shaft system of the gearbox is better stressed and the measurement result is more accurate. In addition, a lifting hole can be processed on the circumference of the output gear shaft 001 to facilitate lifting.

[0057] The method for adjusting the axial clearance of the output shaft system of the single-screw extruder gearbox provided in this embodiment is to design a separate positioning fixture 100, use the positioning fixture 100 and the gearbox output shaft system to adjust the size of the positioning component 200 according to the reference axial clearance of the gearbox, and when the size of the positioning component 200 is determined, the gearbox output shaft system is directly assembled to the gearbox body 004 using the positioning component 200, ensuring that the axial clearance of the gearbox output shaft system meets the design requirements. Since the positioning fixture 100 has a simple structure and a light overall weight, it is easy to flip, and the horizontality after flipping is easy to adjust, and finally an accurate axial clearance can be obtained, which is conducive to the processing and manufacturing of the gearbox.

[0058] Please combine Figure 3 This embodiment also provides a single-screw extruder assembly method, including the above-mentioned gap adjustment method. During assembly, the structural dimensions of the positioning assembly 200 whose axial displacement meets the standard axial gap requirements are first obtained through the above-mentioned gap adjustment method, and then the gearbox output shaft system is installed on the gearbox body 004, and the positioning assembly 200 is installed on the gearbox body 004. The position of the gearbox output shaft system is limited by the positioning assembly 200 and the gearbox body 004, so that the gap of the gearbox output shaft system meets the patent requirements. Then the screw 006 is installed on the output gear shaft 001, and then the barrel 005 is installed on the output port of the gearbox body 004, and the head 007 is installed at the end of the barrel 005. The assembly of the extruder is convenient and reliable.

[0059] Optionally, before installing the barrel 005 on the output port, the process further includes machining an inner stop 041 on the end face of the output port, so that the axis of the inner stop 041 moves downward relative to the axis of the assembly hole of the gear box body 004 for penetrating the output gear shaft 001, and then inserting the barrel 005 into the inner stop 041. In this way, the effect of the deadweight of the output shaft system of the gear box on the coaxiality can be compensated.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for adjusting the axial clearance of the output shaft system of a single-screw extruder gearbox, characterized in that: The gearbox output shaft system comprises an output gear shaft (001), a first bearing (002) and a second bearing (003), wherein the inner rings of the first bearing (002) and the second bearing (003) are both sleeved outside the output gear shaft (001); the clearance adjustment method comprises the following steps: Step s100: The gearbox output shaft system is mounted on a positioning fixture (100) in a suspended manner, so that the outer ring of the second bearing (003) is in contact with the inner reference surface (102) of the positioning fixture (100) at a side away from the first bearing (002), so that the weight of the gearbox output shaft system acts on the inner reference surface (102) through the outer ring of the second bearing (003); Step s200: installing the positioning assembly (200) on the outer reference surface (103) of the positioning fixture (100) so that the positioning assembly (200) contacts the side of the outer ring of the first bearing (002) away from the second bearing (003); by cooperating with the positioning assembly (200) and the inner reference surface (102), the outer ring of the first bearing (002) and the outer ring of the second bearing (003) are restricted to be away from each other; the distance between the outer reference surface (103) and the inner reference surface (102) is L1, and the distance between the first positioning surface of the gear box body (004) that cooperates with the gear box output shaft system and is used to install the positioning assembly (200) and the second positioning surface for installing the outer ring of the second bearing (003) is L2, and L1=L2; Step s300: applying force to the output gear shaft (001) and lifting the gearbox output shaft system, so that the gearbox output shaft system has a tendency to move away from the inner reference surface (102), and measuring the axial displacement of the output gear shaft system; Step s400: comparing the measured value of the axial displacement with the standard axial clearance of the gearbox output shaft system; when the measured value of the axial displacement does not meet the requirement of the standard axial clearance, adjusting the size of the positioning assembly (200), and repeating steps s200-s400 until the measured value of the axial displacement meets the requirement of the standard axial clearance.

2. The method for adjusting the axial clearance of the output shaft system of the single-screw extruder gear box according to claim 1, characterized in that: The positioning assembly (200) comprises a transparent cover (210) and an adjustment ring (220); in the step s200, the step of installing the positioning assembly (200) on the outer reference surface (103) of the positioning tool (100) comprises: First, the adjusting ring (220) is sleeved on the outside of the output gear shaft (001), so that the adjusting ring (220) contacts the side of the outer ring of the first bearing (002) away from the second bearing (003), and then the transparent cover (210) is matched with the outer reference surface (103), so that the transparent cover (210) contacts the side of the adjusting ring (220) away from the first bearing (002).

3. The method for adjusting the axial clearance of the output shaft system of the single screw extruder gear box according to claim 2, characterized in that: In the step s400, when the measured value of the axial displacement does not meet the requirement of the standard axial clearance, the size of the transparent cover (210) or the adjustment ring (220) is adjusted.

4. The method for adjusting the axial clearance of the output shaft system of the single-screw extruder gear box according to claim 1, characterized in that: The method further includes adjusting the horizontality of the positioning tool (100) between step s100 and step s200 so that the inner reference surface (102) is arranged horizontally.

5. The method for adjusting the axial clearance of the output shaft system of the single screw extruder gear box according to claim 1, characterized in that: The method further includes installing an indicator gauge (300) on the positioning fixture (100) between step s200 and step s300, bringing the pointer of the indicator gauge (300) into contact with the top end surface of the output gear shaft (001), and measuring the axial displacement using the indicator gauge (300).

6. The method for adjusting the axial clearance of the output shaft system of the single screw extruder gear box according to claim 1, characterized in that: The method further includes rotating the output gear shaft (001) between step s100 and step s200, and utilizing the deadweight of the gearbox output shaft system and the automatic centering characteristics of the first bearing (002) and the second bearing (003) to automatically center the axis of the gearbox output shaft system and the axis of the positioning tool (100).

7. The method for adjusting the axial clearance of the output shaft system of the single screw extruder gear box according to claim 1, characterized in that: In the step s300, force is applied to the output gear shaft (001) along the axial direction of the output gear shaft (001) to lift the output shaft system of the gear box.

8. A method for assembling a single screw extruder, characterized in that: The method includes: A method for adjusting the axial clearance of the output shaft system of a single-screw extruder gearbox according to any one of claims 1 to 7.

9. The single screw extruder assembly method according to claim 8, characterized in that: The method also includes the following steps: installing the gearbox output shaft system on the gearbox body (004), installing a positioning assembly (200) whose axial displacement meets the standard axial clearance requirements on the gearbox body (004), and then installing the screw (006) on the output gear shaft (001), and then installing the barrel (005) on the output port of the gearbox body (004).

10. The single screw extruder assembly method according to claim 9, characterized in that: Before the barrel (005) is installed on the output port, it also includes processing an inner stop (041) on the end face of the output port so that the axis of the inner stop (041) moves downward relative to the axis of the assembly hole of the gear box body (004) for penetrating the output gear shaft (001); and then inserting the barrel (005) into the inner stop (041).

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