A modularly designed test fixture and a pressing method for the output shaft expansion sleeve.

Abstract

This invention provides a modularly designed test fixture and a pressing method for an output shaft expansion sleeve, relating to the field of rolling mill equipment technology. It includes a transmission gearbox mounting base, a main transmission gearbox, and an output shaft. The main transmission gearbox is connected to the base via modular slots, which facilitate disassembly and position adjustment, ensuring alignment with the center of the input end of the vertical reducer. In the output end structure, the output shaft is inserted into the hollow output shaft of the main transmission gearbox. Assembly guidance is provided by the guide diameter at the lower end of the output shaft, and an interference fit is achieved through hydraulic expansion of the expansion sleeve under hydraulic drive. The end of the output shaft is positioned by a locking nut with a locking buckle. This invention solves the problems of uneven lifting, difficult assembly, and poor versatility of existing integral fixtures. By changing the base and output shaft, different specifications of products can be adapted, reducing manufacturing costs and labor intensity. Furthermore, the hydraulic expansion method ensures uniform force distribution, enabling non-destructive disassembly and rapid replacement of the output shaft.

Description

Technical Field

[0001] This invention relates to the field of steel rolling equipment technology, and more particularly to a modularly designed commissioning fixture and a pressing method for the output shaft expansion sleeve. Background Technology

[0002] Vertically mounted reducers (gearboxes) are widely used in the metallurgical steel rolling industry and are key heavy-duty transmission equipment in the vertical roll section of hot strip mills or medium and heavy plate mills. Because the axis of a vertically mounted reducer is perpendicular, its operating condition differs from that of a conventional parallel shaft reducer. Therefore, a no-load test run using specialized testing fixtures is required before delivery from the factory.

[0003] However, existing vertical-mounted reducer commissioning fixtures have several drawbacks: First, because the main drive gearbox and its mounting base are an integral structure, the overall size and weight are large, making it prone to severe eccentricity and tilting during hoisting and transportation, and difficult to disassemble after assembly with the reducer input end; Second, the output shaft of the main drive gearbox is usually an integral output shaft, making it very difficult to assemble with the internal gears of the vertical-mounted reducer input end; Third, because the specifications and interface dimensions of the motor support base and input shaft of different vertical reducers vary, the existing fixtures have poor versatility and cannot be directly adapted to products of different specifications, thus increasing the manufacturing cost of the fixtures.

[0004] Therefore, there is an urgent need to develop a testing fixture and method that can solve the problems of uneven lifting, difficult assembly, and poor versatility. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a modularly designed test fixture and a pressing method for the output shaft expansion sleeve. By modularly disassembling the main fixture body and using a hydraulic expansion sleeve to connect the output shaft, this invention enables convenient and universal testing of vertical reducers.

[0006] To achieve the above objectives, the present invention provides a modularly designed test fixture, comprising: a transmission gearbox mounting base, a main transmission gearbox, and an output shaft;

[0007] The transmission gearbox mounting base is used to install on the motor mounting base of the vertically mounted reducer;

[0008] The main drive gearbox is detachably mounted on the drive gearbox mounting base;

[0009] The output shaft is detachably connected to the output end of the main drive gearbox and is used to connect to the input end of the vertically mounted reducer.

[0010] Furthermore, the main drive gearbox and the drive gearbox mounting base are connected by a modular slot; the position of the main drive gearbox is adjusted by the modular slot so that the center of the output shaft of the main drive gearbox is aligned with the center of the input end of the vertically mounted reducer.

[0011] Furthermore, the output end structure of the main transmission gearbox includes an output hollow shaft, an output connecting shaft, a hydraulic expansion sleeve, and a locking nut with a latch; the output connecting shaft is inserted into the output hollow shaft; the hydraulic expansion sleeve is disposed between the output hollow shaft and the output connecting shaft, and expands under hydraulic drive to achieve an interference fit between the output hollow shaft and the output connecting shaft; the locking nut with a latch is installed at the end of the output connecting shaft.

[0012] Furthermore, the upper end of the output shaft is provided with a thread for the locking nut with a locking buckle to be screwed in. After the locking nut with a locking buckle is tightened, it contacts the end face of the hydraulic expansion sleeve, thereby playing a role in axial positioning of the output shaft.

[0013] Furthermore, the lower end of the output connector is provided with a guide diameter, which is clearance-fitted with the output hollow shaft, and is used to guide the output connector into the output hollow shaft during installation.

[0014] Furthermore, the hydraulic expansion sleeve is connected to a hydraulic oil circuit, and different output torques can be transmitted by adjusting the pressure of the hydraulic oil; when the hydraulic expansion sleeve is depressurized, the output shaft can be removed from the main drive gearbox.

[0015] Furthermore, the transmission gearbox mounting base is selected based on the actual dimensions of the stop and engagement bolt holes of the vertically mounted reducer motor mounting base, and the transmission gearbox mounting base is fixed to the vertically mounted reducer motor mounting base by bolts.

[0016] This invention also provides a pressing method for the output shaft expansion sleeve of a modularly designed test fixture, which includes the following steps:

[0017] S1. The output connector is installed into the hollow output shaft, and guided by the clearance fit between the guide diameter at the lower end of the output connector and the hollow output shaft.

[0018] S2. Pull the upper end of the output shaft and inject pressure into the hydraulic expansion sleeve to expand the hydraulic expansion sleeve, thereby making the expansion sleeve and the output shaft fit together with an interference fit.

[0019] S3. Tighten the locking nut with a latch onto the end of the output shaft and lock it.

[0020] Furthermore, in S2, the pressure value injected into the hydraulic expansion sleeve is... Determined by the following formula:

[0021]

[0022]

[0023] in, To minimize the binding pressure, This refers to the output torque of the transmission box. The safety factor is μ, and the coefficient of friction is μ. To match the diameter, For hydraulic expansion sleeve mating length, This is the proportionality coefficient.

[0024] Furthermore, the friction coefficient μ is set to a value of 0.15-0.20, and the proportionality coefficient... The value ranges from 2.5 to 3.

[0025] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] 1. The present invention provides a modular design for test fixtures, which improves the original integral fixtures into a modular assembly structure. By retaining the core main transmission gearbox, only the transmission gearbox mounting base and output shaft need to be replaced to adapt to vertically mounted reducers of different specifications and torques, avoiding the repeated manufacturing of fixtures for different products and significantly reducing the manufacturing cost of fixtures.

[0027] 2. The present invention provides a modular test fixture, which solves the problem of uneven weight and tilting caused by the unstable center of gravity during hoisting of the original integral fixture by separating the main transmission gearbox and the mounting base; at the same time, the size and weight of the separated modules are moderate, which reduces the assembly difficulty and labor intensity, and significantly reduces the installation time for a single test run.

[0028] 3. The present invention provides a modular test fixture with a hydraulic expansion sleeve connecting the output shaft and the hollow shaft at the output end. Compared with the traditional integral structure, it simplifies the disassembly and assembly process and effectively avoids damage to parts when replacing the output shaft. In addition, the hydraulic expansion sleeve is evenly stressed, avoiding stress concentration, and can transmit different output torques by adjusting the hydraulic oil pressure according to the test requirements.

[0029] 4. The present invention provides a method for press-fitting the output shaft expansion sleeve of a modular test fixture. By using the guide diameter at the lower end of the output shaft for assembly guidance, the difficulty of alignment is effectively reduced and the damage to parts caused by forced assembly is avoided. At the same time, by accurately calculating and adjusting the pressure value of the hydraulic expansion sleeve through a formula, the transmitted output torque can be flexibly controlled, which not only ensures the reliability of the connection and the uniform stress distribution, but also realizes the non-destructive disassembly and quick replacement of the output shaft. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the bottom structure of a modularly designed test fixture according to the present invention;

[0032] Figure 2 This is a schematic diagram of the upper structure of a modularly designed test fixture according to the present invention;

[0033] Figure 3 This is a side view of a modularly designed test fixture according to the present invention;

[0034] Figure 4 This is a schematic diagram of the transmission gearbox mounting base structure of a modularly designed test fixture according to the present invention;

[0035] Figure 5 This is a schematic diagram of the main drive gearbox structure of a modularly designed test fixture according to the present invention;

[0036] Figure 6 This is a schematic diagram of the transmission gearbox mounting base and the main transmission gearbox connection structure of a modularly designed test fixture according to the present invention.

[0037] Figure 7 A schematic diagram of the main drive gearbox output shaft structure of a modularly designed test fixture according to the present invention;

[0038] Figure 8 This is a schematic diagram of the guide diameter of the main drive gearbox output shaft of a modular test fixture according to the present invention;

[0039] Figure 9 This is a flowchart of the press-fitting method for the output shaft expansion sleeve of a modularly designed test fixture according to the present invention.

[0040] In the diagram: 1. Transmission gearbox mounting base; 2. Main transmission gearbox; 3. Output shaft; 4. Modular slot; 5. Input shaft; 6. Output hollow shaft; 7. Hydraulic expansion sleeve; 8. Locking nut with latch; 9. Guide diameter. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0045] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0048] like Figures 1 to 8 As shown, the present invention provides a modularly designed test fixture, including: a transmission gearbox mounting base 1, a main transmission gearbox 2, and an output shaft 3;

[0049] The transmission gearbox mounting base 1 is selected and matched according to the actual dimensions of the stop and engagement bolt holes of the vertically mounted reducer motor mounting bracket to be tested. During installation, the transmission gearbox mounting base 1 is first fixed to the vertically mounted reducer motor mounting bracket with bolts. The main transmission gearbox 2 is detachably mounted on the transmission gearbox mounting base 1. Through modular design, the serious eccentric tilting problem caused by the instability of the center of gravity due to the input shaft 5 during overall hoisting is solved, improving hoisting safety. At the same time, for different specifications of products, only the base and output shaft 3 need to be replaced, while the core main transmission gearbox 2 is retained, thereby improving the versatility of the tooling and significantly reducing the manufacturing cost of the tooling.

[0050] Specifically, the main drive gearbox 2 and the drive gearbox mounting base 1 are connected by a modular slot 4. This modular slot 4 allows adjustment of the position of the main drive gearbox 2, ensuring precise alignment between the center of the output shaft 3 of the main drive gearbox 2 and the center of the input end of the vertically mounted reducer. This ensures coaxiality between the test fixture and the reducer under test, guaranteeing transmission accuracy. Furthermore, this adjustable connection method can accommodate vertically mounted reducer motor mounting bases of different sizes, enhancing adaptability.

[0051] The output shaft 3 is detachably connected to the output end of the main drive gearbox 2, and is used to transmit torque to the input end of the vertically mounted reducer. The output end structure of the main drive gearbox 2 specifically includes: a hollow output shaft 6, an output shaft 3, a hydraulic expansion sleeve 7, and a locking nut 8 with a locking buckle. The output shaft 3 is inserted into the inner hole of the hollow output shaft 6. Figure 8 As shown, for ease of assembly, the lower end of the output shaft 3 is specially provided with a guide diameter 9, which is designed to have a clearance fit with the output hollow shaft 6. During installation, the guide diameter 9 acts as a guide, guiding the output shaft 3 smoothly into the output hollow shaft 6, avoiding damage to parts caused by forced assembly.

[0052] A hydraulic expansion sleeve 7 is installed between the output hollow shaft 6 and the output connecting shaft 3. This hydraulic expansion sleeve 7 is connected to a hydraulic oil circuit and can expand radially under hydraulic drive, thereby realizing an interference fit between the output hollow shaft 6 and the output connecting shaft 3. By adjusting the oil pressure, different output torques can be flexibly controlled and transmitted to meet the test run requirements of different specifications of reducers. The pressure relief disassembly method realizes non-destructive disassembly and greatly reduces labor intensity.

[0053] A locking nut 8 with a locking clip is installed at the end of the output shaft 3. Specifically, the upper end of the output shaft 3 is threaded for the locking nut 8 to be screwed in. When the locking nut is tightened, its end face contacts the end face of the hydraulic expansion sleeve 7, mainly serving to axially position the output shaft 3.

[0054] Based on the above tooling structure, such as Figure 9 As shown in the figure, this embodiment also provides a press-fitting method for the output shaft expansion sleeve of the modularly designed test fixture, the specific steps of which are as follows:

[0055] S1. Install the output connector 3: Install the output connector 3 into the hollow output shaft 6 of the main drive gearbox 2. During this process, the guide diameter 9 at the lower end of the output connector 3 is used to guide the output connector 3 into place smoothly by using the clearance fit between the guide diameter 9 at the lower end of the output connector 3 and the hollow output shaft 6.

[0056] S2. Hydraulic Expansion: Pull the upper end of the output shaft 3 and inject pressure into the hydraulic expansion sleeve 7, causing the hydraulic expansion sleeve 7 to expand, thereby placing the hydraulic expansion sleeve 7 and the output shaft 3 in an interference fit. To ensure a reliable connection and the transmission of sufficient torque, the pressure injected into the hydraulic expansion sleeve 7 is... Determined by the following formula:

[0057]

[0058]

[0059] in, To minimize the binding pressure, This refers to the output torque of the transmission box. For safety reasons, The coefficient of friction, To match the diameter, For hydraulic expansion sleeve mating length, This is the proportionality coefficient.

[0060] In this embodiment The value ranges from 0.15 to 0.20. The value ranges from 2.5 to 3.

[0061] S3. Locking and positioning: After the hydraulic expansion is completed, screw the locking nut 8 with a lock on the upper thread of the output shaft 3 and lock it to complete the axial positioning of the output shaft 3.

[0062] When the test run is complete or when it is necessary to replace the output shaft 3 with a different specification, simply remove the locking nut 8 with the locking clip, and then depressurize the hydraulic expansion sleeve 7. After depressurization, the interference fit is released, and the output shaft 3 can be easily removed from the main drive gearbox 2.

[0063] Application method of this embodiment:

[0064] Based on the actual dimensions of the stop and bolt holes of the vertically mounted reducer motor mounting base to be tested, select a matching transmission gearbox mounting base 1 and output shaft 3. Fix the transmission gearbox mounting base 1 to the vertically mounted reducer motor mounting base with bolts. Then, test-fit the lower end of the output shaft 3 with the coupling of the input shaft of the test vertical reducer. After installation, lift and lower the main transmission gearbox 2 so that the output shaft 3 is inserted into the output hollow shaft 6 of the main transmission gearbox 2 through the guide diameter 9. After the main drive gearbox 2 falls to a certain height, its upper slot aligns with the bolt holes on the mounting base 1, and its position is adjusted by the nearby set screws to ensure that the center of the output shaft 3 of the main drive gearbox 2 is precisely aligned with the input end of the vertically mounted reducer and to fix the position of the main drive gearbox 2 on the base. At this time, pull the upper end of the output shaft 3 and inject hydraulic oil of a specific pressure calculated by the formula into the hydraulic expansion sleeve 7 located between the output hollow shaft 6 and the output shaft 3, so that the hydraulic expansion sleeve 7 expands to achieve an interference fit between the two. Then, tighten the locking nut 8 with a lock at the end of the output shaft 3 to complete the axial positioning. After the test run is completed or when it is necessary to replace the parts, simply remove the locking nut 8 and depressurize the hydraulic expansion sleeve 7 to easily remove the output shaft 3 from the main drive gearbox 2.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular designed test vehicle tooling characterized by, The transmission gear box mounting base, the main transmission gear box and the output shaft; The transmission gear box mounting base is used for being mounted on the motor mounting seat of the vertical installation speed reducer; The main transmission gear box is detachably mounted on the transmission gear box mounting base; The output shaft is detachably connected at the output end of the main transmission gear box and used for being connected with the input end of the vertical installation speed reducer; The main transmission gear box and the transmission gear box mounting base are connected through a modular slot, the position of the main transmission gear box is adjusted through the modular slot, and the center of the output shaft of the main transmission gear box is aligned with the center of the input end of the vertical installation speed reducer; The output end structure of the main transmission gear box comprises an output hollow shaft, an output shaft, a hydraulic expansion sleeve and a locking nut with a lock buckle; the output shaft is inserted into the output hollow shaft; the hydraulic expansion sleeve is arranged between the output hollow shaft and the output shaft and is expanded under the hydraulic drive to realize the interference connection of the output hollow shaft and the output shaft; and the locking nut with the lock buckle is mounted at the end of the output shaft. The main transmission gear box and the transmission gear box mounting base are connected through a modular slot, the position of the main transmission gear box is adjusted through the modular slot, and the center of the output shaft of the main transmission gear box is aligned with the center of the input end of the vertical installation speed reducer.

2. A modular designed test vehicle tooling according to claim 1, characterized in that, The output end structure of the main transmission gear box comprises an output hollow shaft, an output shaft, a hydraulic expansion sleeve and a locking nut with a lock buckle; the output shaft is inserted into the output hollow shaft; the hydraulic expansion sleeve is arranged between the output hollow shaft and the output shaft and is expanded under the hydraulic drive to realize the interference connection of the output hollow shaft and the output shaft; and the locking nut with the lock buckle is mounted at the end of the output shaft.

3. A modular designed test rig according to claim 2, characterized in that The upper end of the output shaft is provided with threads for screwing the locking nut with the lock buckle, and the locking nut with the lock buckle is in contact with the end face of the hydraulic expansion sleeve after being screwed, thereby playing the role of axial positioning of the output shaft.

4. A modular designed test rig according to claim 3, characterized in that The lower end of the output shaft is provided with a guide diameter, and the guide diameter is in clearance fit with the output hollow shaft, so as to guide the output shaft into the output hollow shaft during installation.

5. A modular designed test rig according to claim 4, characterized in that The hydraulic expansion sleeve is connected with a hydraulic oil circuit, different output torques can be transmitted by adjusting the pressure of the hydraulic oil, and the output shaft can be detached from the main transmission gear box after the hydraulic expansion sleeve is depressurized.

6. A modular designed test rig according to claim 5, characterized in that The transmission gear box mounting base is selected according to the actual size of the stop opening and the split bolt hole of the motor mounting seat of the vertical installation speed reducer, and the transmission gear box mounting base is fixed on the motor mounting seat of the vertical installation speed reducer through bolts.

7. A modular designed test rig according to claim 6, characterized in that The steps comprise:

8. A method for pressing the output shaft sleeve of a modular designed test vehicle tooling, based on the modular designed test vehicle tooling of claim 7, characterized in that, S1, the output shaft is inserted into the output hollow shaft, and the guide diameter at the lower end of the output shaft is used to guide the clearance fit with the output hollow shaft; S2, the upper end of the output shaft is pulled, and pressure is injected into the hydraulic expansion sleeve to make the hydraulic expansion sleeve expand, so that the expansion sleeve and the output shaft are in interference connection; ​ S3, on the end of the output axle, screw on the lock nut with lock buckle and lock.

9. The pressing method for the output shaft expansion sleeve of a modularly designed test fixture according to claim 8, characterized in that, In S2, the pressurizing value of the hydraulic pressure type expanding sleeve inner injection pressure is determined by the following equation: wherein, is the minimum binding pressure, is the transmission output torque, is the safety factor, is the friction coefficient, is the mating diameter, is the expansion sleeve mating length, is the proportionality coefficient.

10. The method of claim 9, wherein the output shaft sleeve is pressed onto the output shaft of the vehicle test device. the friction coefficient the proportionality coefficient takes values from 2.5 to 3.

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