Rolling mill gear meshing inspection device and method

Abstract

The invention provides a rolling mill gear meshing detection device and method, and relates to the technical field of gear detection, the rolling mill gear meshing detection device comprises a gear box assembly having two gear box bodies which are detachably connected, the gear box assembly having first sides which are oppositely arranged, a bearing hole is formed in the box wall of the first side of each gearbox body, the connecting line of the centers of the two bearing holes is a gear axis, and the gear axes of the two gearboxes are arranged in parallel; the standard core shaft is arranged in a gear box body, and the two ends of the standard core shaft are rotatably installed in the two bearing holes respectively; the parallelism adjusting assembly is detachably connected to the gear box assembly, and the parallelism adjusting assembly is used for adjusting the parallelism of the axes of the two gears; and the coaxiality adjusting assembly is detachably connected to the gear box assembly and used for adjusting the coaxiality of the two bearing holes of the gear box body, and the machining form and location tolerance problem of the box body can be preliminarily judged.

Description

Technical Field

[0001] The present invention relates to the technical field of gear detection, and particularly relates to a rolling mill gear meshing inspection device and method. Background Art

[0002] In high-speed wire rod and bar production lines, the models of long product high-speed area rolling mills are constantly upgraded and updated. At present, long product high-speed area rolling mills are divided into two categories: single-drive module rolling mills and centralized-drive module rolling mills.

[0003] Taking a one-drive-two centralized-drive module rolling mill as an example, its internal drive components include: the input cylindrical helical gear shaft system and the horizontal shaft system are in meshing transmission through cylindrical helical gears, the horizontal shaft system and the cone shaft system are in meshing transmission through a pair of bevel gears, and the cone shaft system and the idle shaft system are in rotational engagement through cylindrical helical gears. The cone shaft system and the idle shaft system are respectively in meshing transmission with the roll shafts in the roll box through cylindrical helical gears.

[0004] The gearboxes of single-drive module rolling mills and one-drive-two centralized-drive module rolling mills have relatively high requirements for the box body welding process and numerical control machining process, and it is a key quality control link during the inspection and assembly processes. Further, the inspection of gears and gear shafts is another key quality control link in the inspection and assembly of gearboxes. Usually, after the box body is processed, the manufacturer will issue a three-coordinate inspection report, and before the gears and gear shaft parts leave the factory, a tooth inspection report will be issued. In the prior art, before the components enter the assembly link, it is necessary to re-inspect all the parts arriving at the workshop. In addition, after the rolling mill is assembled, the gear backlash and meshing coloring area will be inspected. If it is found that the gear backlash coloring area is unreasonable, it is necessary to further determine whether it is a problem with the box body processing, the gear (gear shaft) processing, or the processing quality of other components related to the shaft system (such as bearing sleeves, bearings). Small components such as shaft system bearing sleeves and bearings can quickly determine whether the dimensional tolerance and geometric tolerance processing are out of tolerance through conventional measuring tools. However, it is generally not easy to quickly determine the cause of the problem with the dimensional tolerance and geometric tolerance of the box body and gears through conventional inspection tools. The usual treatment plan is to hand over the box body to a third-party inspection unit for re-inspection, hand over the gears to a third-party unit for re-inspection, and determine the cause of the problem after receiving the report. Handing over the box body and gears to a third-party inspection has a long cycle for the whole process, and additional freight and inspection costs are incurred.

[0005] In view of this, based on the production design experience of the inventor in this field and related fields for many years, through repeated tests, a rolling mill gear meshing inspection device and method have been designed to solve the problems existing in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a rolling mill gear meshing inspection device and method for the meshing inspection of cylindrical helical gears after assembly and the preliminary judgment of the geometric tolerance problems of the box body processing after assembly.

[0007] To achieve the above object, the present invention provides a rolling mill gear meshing inspection device, wherein the rolling mill gear meshing inspection device includes:

[0008] A gearbox assembly having two gearbox bodies, the two gearbox bodies being detachably connected. The gearbox assembly has a first side disposed opposite to each other. Bearing holes are provided on the box walls of the first sides of the respective gearbox bodies. The line connecting the centers of the two bearing holes is the gear axis, and the gear axes of the two gearboxes are arranged in parallel;

[0009] A standard mandrel is disposed in one of the gearbox bodies, and both ends of the standard mandrel are rotatably mounted in the two bearing holes respectively;

[0010]

[0011] A parallelism adjustment assembly is detachably connected to the gearbox assembly, and the parallelism adjustment assembly is used to adjust the parallelism of the two gear axes;

[0012] The present invention also provides a rolling mill gear meshing inspection method, wherein the rolling mill gear fitting inspection method includes:

[0013] Inspecting the gear shaft and the gear assembled in the rolling mill transmission box and obtaining an inspection result;

[0014] Assembling the gear shaft and the gear on the rolling mill gear meshing inspection device as described above;

[0015] Adjusting the parallelism between the gear shaft and the gear, and the coaxiality of the two bearing holes of the gearbox body through the rolling mill gear meshing inspection device, so that the meshing state of the gear shaft and the gear is consistent with the inspection result;

[0016] Analyzing the manufacturing problems of the rolling mill transmission box according to the adjustment data of the parallelism and the coaxiality.

[0017] Compared with the prior art, the present invention has the following characteristics and advantages:

[0018] The mill gear meshing inspection device and method proposed by the present invention are used for gear and gear shaft inspection, as well as systematic analysis and preliminary judgment of problems in the mill transmission housing. Before assembling the mill transmission housing, parts are inspected. After determining that there are no problems with the gear shaft and gear meshing, the assembly work can be carried out. If the colored area of the gear meshing after assembly does not meet expectations, instead of returning the gear and gear shaft to the factory again, the preliminary cause of the housing processing problem can be further judged through the mill gear meshing inspection device and method proposed by the present invention, and further inspection and processing can be carried out, reducing the time for the gear to return to the factory and lowering the transportation and inspection costs of the transmission housing, meeting the requirements for cost reduction and efficiency improvement in the manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and scale dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and scale dimensions of the components of the present invention. Those skilled in the art can, under the teachings of the present invention, select various possible shapes and scale dimensions according to specific circumstances to implement the present invention.

[0020] Figure 1 is a schematic structural diagram of the mill gear meshing inspection device in the present invention;

[0021] Figure 2 is a schematic diagram of the first side of the gearbox assembly in the present invention;

[0022] Figure 3 is a schematic diagram of the gearbox assembly in the present invention;

[0023] Figure 4 is a top view of the gear housing in the present invention;

[0024] Figure 5 is Figure 2 a sectional view taken along the line A-A in

[0025] Figure 6 is a schematic diagram of the second upper bearing housing in the present invention;

[0026] Figure 7 is a schematic diagram of the standard housing in the present invention;

[0027] Figure 8 is a schematic diagram of the bearing sleeve in the present invention;

[0028] Figure 9 is a schematic structural diagram of the standard mandrel in the present invention.

[0029] DESCRIPTION OF REFERENCE NUMERALS

[0030] 100, mill gear meshing inspection device; 10, gearbox assembly;

[0031] 101, First side; 102, Second side;

[0032] 11, Gear housing; 12, Bearing hole;

[0033] 13, First lower bearing seat; 14, First upper bearing seat;

[0034] 15, Second lower bearing seat; 16, Second upper bearing seat;

[0035] 17, Standard housing; 18, Positioning hole;

[0036] 19, Observation window; 20, Standard mandrel;

[0037] 30, Stud assembly; 31, Stud;

[0038] 32, Nut; 40, Press plate connecting piece;

[0039] 41, Press plate; 42, Bolt;

[0040] 50, Bearing sleeve; 200, Gear shaft;

[0041] 300, Gear. Detailed implementation manners

[0042] Combined with the description of the specific implementation manners of the present invention and the attached drawings, the details of the present invention can be more clearly understood. However, the specific implementation manners of the present invention described herein are only for the purpose of explaining the present invention and cannot be understood in any way as a limitation of the present invention. Under the teaching of the present invention, those skilled in the art can conceive any possible deformations based on the present invention, and these should all be regarded as belonging to the scope of the present invention.

[0043] Such as Figures 1 to 9As shown in the figure, the present invention provides a rolling mill gear meshing inspection device 100, which includes a gearbox assembly 10, a standard mandrel 20, a parallelism adjustment assembly and a coaxiality adjustment assembly. The gearbox assembly 10 includes at least two gearbox bodies 11, and the two gearbox bodies 11 are detachably connected. The gearbox assembly 10 has two opposite first sides 101. Bearing holes 12 are provided on the box walls of the first sides 101 of each gearbox body 11. The connection line of the centers of the two bearing holes 12 of the gearbox body 11 forms the gear axis of the gearbox body 11. The gear axes of the two gearbox bodies 11 are arranged in parallel. The standard mandrel 20 is arranged in one of the gearbox bodies 11, and the standard mandrel 20 is arranged along the gear axis. The two ends of the standard mandrel 20 are respectively rotatably installed in the two bearing holes 12; the parallelism adjustment assembly is detachably connected to the gearbox assembly 10 and is used to adjust the parallelism of the two gear axes; the coaxiality adjustment assembly is detachably connected to the gearbox assembly 10 and is used to adjust the coaxiality of the two bearing holes 12 of the gearbox body 11.

[0044] The rolling mill gear meshing inspection device 100 provided by the present invention can simulate the assembly state of the gear shaft 200 and the gear 300 in the rolling mill transmission box. In particular, the parallelism of the gear shaft 200 and the gear 300 can be adjusted through the parallelism adjustment assembly, and the coaxiality of the bearing holes 12 can be adjusted through the coaxiality adjustment assembly, so that the meshing state of the gear shaft 200 and the gear 300 can accurately simulate the change of the gear meshing state caused by the machining error of the box body bearing hole, providing a reference for the analysis of the box body machining and manufacturing problems. Through the rolling mill gear meshing inspection device 100 provided by the present invention, inspectors can analyze the specific reasons for the out-of-tolerance of the shaft hole positioning dimensions, external dimensions and form and position tolerances caused by the welding, heat treatment and finish machining processes of the rolling mill box body, so as to judge whether it is possible to perform the next step of processing on the gears, gear shafts and transmission box bodies in the assembly workshop or return them to the factory for processing, reducing the time for the gears, output shafts and transmission box bodies to return to the factory, and reducing the transportation and inspection costs of the gears, output shafts and transmission box bodies, achieving cost reduction and efficiency increase in the construction of the rolling mill production line.

[0045] The present invention also provides a rolling mill gear meshing inspection method, which includes:

[0046] Inspect the gear shaft 200 and the gear 300 assembled in the rolling mill transmission box and obtain the inspection results;

[0047] Assemble the gear shaft 200 and the gear 300 on the rolling mill gear meshing inspection device 100 as described above;

[0048] Adjust the parallelism between the gear shaft 200 and the gear 300 and the coaxiality of the two bearing holes 12 of the gear housing through the mill gear meshing inspection device 100, so that the meshing state of the gear shaft 200 and the gear 300 is consistent with the inspection result; analyze the manufacturing problems of the mill transmission case according to the adjustment data of the parallelism and coaxiality.

[0049] The mill gear meshing inspection method proposed by the present invention can simulate the assembly state of the gear shaft 200 and the gear 300 in the mill transmission case through the mill gear meshing inspection device 100, and can preliminarily judge the machining geometric tolerance problems of the transmission case after assembly. After determining that there is no problem with the meshing of the gear shaft 200 and the gear 300, it is not necessary to return the gear 300 and the gear shaft 200 to the factory again, and it is also possible to further judge the preliminary reasons for the machining problems of the transmission case, reduce the time for the transmission case and the gear to return to the factory, reduce the transportation and inspection costs of the transmission case, and meet the requirements of the manufacturing industry for cost reduction and efficiency improvement.

[0050] In an optional example of this embodiment, two gear housings 11 are arranged up and down. The gear housing 11 located below includes a first lower bearing seat 13 and a first upper bearing seat 14. The gear housing 11 located above includes a second lower bearing seat 15 and a second upper bearing seat 16. After the two gear housings 11 are assembled, the second upper bearing seat 16, the second lower bearing seat 15, the first upper bearing seat 14 and the first lower bearing seat 13 are arranged in sequence from top to bottom to form a four-layer structure.

[0051] In an optional example, semi-circular notches are respectively formed on the first lower bearing seat 13 and the first upper bearing seat 14. After the first lower bearing seat 13 and the first upper bearing seat 14 are buckled in place, the two semi-circular notches are in butt joint to form a bearing hole 12; similarly, semi-circular notches are respectively formed on the second lower bearing seat 15 and the second upper bearing seat 16. After the second lower bearing seat 15 and the second upper bearing seat 16 are buckled in place, the two semi-circular notches are in butt joint to form a bearing hole 12.

[0052] With the above structure, when it is necessary to install the gear shaft 200 or the gear 300, the second upper bearing seat 16, the second lower bearing seat 15 and the first upper bearing seat 14 are opened layer by layer. First, install the standard mandrel 20 equipped with the gear 300 on the first lower bearing seat 13, and then buckle the first upper bearing seat 14 on the first lower bearing seat 13; then, stack the second lower bearing seat 15 on the first upper bearing seat 14, install the gear shaft 200 on the second lower bearing seat 15, and then buckle the second upper bearing seat 16 on the second upper bearing seat 16; finally, fixedly connect the second upper bearing seat 16, the second lower bearing seat 15, the first upper bearing seat 14 and the first lower bearing seat 13 together.

[0053] Of course, those skilled in the art can also interchange the positions of the standard mandrel 20 and the gear shaft 200 according to the actual test requirements.

[0054] In an alternative example, the mating surfaces between the second upper bearing housing 16 and the second lower bearing housing 15, between the second lower bearing housing 15 and the first upper bearing housing 14, and between the first upper bearing housing 14 and the first lower bearing housing 13 are all precision-machined surfaces processed by a grinding machine to ensure the assembly accuracy of the gearbox assembly 10.

[0055] In an alternative example, the height of the second lower bearing housing 15 is less than the height of the second upper bearing housing 16, and the height of the first upper bearing housing 14 is less than the height of the first lower bearing housing 13.

[0056] In an alternative embodiment of the present invention, the gearbox assembly 10 further includes a standard housing 17. The standard housing 17 is disposed between the two gear housings 11. The standard housing 17 can adjust the distance between the two gear housings 11, that is, can adjust the spacing of the gear axes of the two gear housings 11, and further realize the adjustment of the gear center distance to meet the inspection requirements of different machine types (rolling mills).

[0057] In an alternative embodiment of the present invention, multiple standard housings 17 can be prepared, and the height of each standard housing 17 is different. By replacing the standard housings 17 with different heights, the distance between the two gear housings 11 can be quickly adjusted.

[0058] Furthermore, the standard housing 17 is detachably connected to the two gear housings 11 respectively.

[0059] In an alternative example of this embodiment, the mating surface of the standard housing 17 and the gear housing 11 is also a precision-machined surface processed by a grinding machine.

[0060] In an alternative embodiment of the present invention, a positioning structure is further provided between the two gear housings 11. The positioning structure includes a cylindrical pin (not shown in the figure) and two positioning holes 18. The two positioning holes 18 are respectively opened on the mating surfaces of the two gear housings 11 and are in alignment and cooperation. The two ends of the cylindrical pin respectively extend into the two positioning holes 18. Through the above positioning structure, the two gear housings 11 can be accurately positioned to ensure the positioning dimension tolerance, the external dimension tolerance, and the form and position dimension tolerance of the standard bearing hole 12.

[0061] Furthermore, the above positioning structure is also provided between the first lower bearing housing 13 and the first upper bearing housing 14, between the second lower bearing housing 15 and the second upper bearing housing 16, and between the standard housing 17 and the first upper bearing housing 14, the second lower bearing housing 15.

[0062] In an alternative embodiment of the present invention, the gear housing 11 and the standard housing 17 are both rectangular housings. The gearbox assembly 10 further has two opposite second sides 102. The gear housing 11 and the standard housing 17 are provided with observation windows 19 on the box walls at the second side, so as to facilitate the testers to check the meshing area coloring of the gear shaft 200 and the gear 300.

[0063] In an alternative embodiment of the present invention, the parallelism adjustment assembly includes a plurality of stud connectors 30. The stud connectors 30 are arranged on the box wall of the first side of the gearbox assembly 10. Each stud connector 30 at least includes a stud 31 and two nuts 32. The stud 31 sequentially penetrates through the box walls of the two gear housings 11, and the two nuts 32 are respectively threadedly connected to both ends of the stud 31 and fixedly connect the two gear housings 11 together.

[0064] In an alternative example of this embodiment, the stud connector 30 further includes a parallelism adjustment gasket group (not shown in the figure). The parallelism adjustment gasket group has at least one parallelism adjustment gasket. The parallelism adjustment gasket is sleeved outside the stud 31 and is located between the two gear housings 11. With the above structure, by changing the number or thickness of the parallelism adjustment gaskets, the parallelism of the two gear axes can be changed.

[0065] In an alternative example of this embodiment, two stud connectors 30 are arranged on the first side, and the two stud connectors 30 are symmetrically arranged on both sides of the gear axis. With the above structure, through the four stud connectors 30, multiple action points that cause changes in parallelism can be simulated, and the deformation of the transmission housing can be better simulated.

[0066] In an alternative embodiment of the present invention, the coaxiality adjustment assembly includes a plurality of pressing plate connectors 40. The pressing plate connectors 40 are arranged on the box wall of the second side 102 of the gearbox assembly 10. The pressing plate connectors 40 are respectively fixedly connected to the box walls of the two gear housings 11. Each pressing plate connector 40 at least includes a pressing plate 41 and a plurality of bolts 42. Threaded holes for mating with the bolts 42 are provided on the box walls of each gear housing 11. One end of each bolt 42 penetrates through the pressing plate 41 and is screwed into the threaded hole. The bolt 42 is threadedly engaged with the box wall of the gear housing 11 and fixedly presses the pressing plate 41 against the box wall of the gear housing 11.

[0067] In an alternative example of this embodiment, each pressing plate connector 40 further includes a coaxiality adjustment gasket group (not shown in the figure). The coaxiality adjustment gasket group has at least one coaxiality adjustment gasket. The coaxiality adjustment gasket is sleeved outside the bolt 42 and is located between the pressing plate 41 and the box wall of the gear housing 11. With the above structure, by changing the number or thickness of the coaxiality adjustment gaskets, the coaxiality of the two gear axes can be changed.

[0068] In an alternative example of this embodiment, two pressing plate connectors 40 are provided on the box wall of the second side 102, and the two pressing plate connectors 40 are arranged at intervals. With the above structure, four pressing plate connectors 40 can simulate multiple acting points that cause changes in coaxiality, and better simulate the deformation of the transmission box body.

[0069] In an alternative embodiment of the present invention, a bearing sleeve 50 is detachably installed in the bearing hole 12. By replacing the bearing sleeve 50 with different inner holes, the gear shafts 200 of different models can be adapted.

[0070] In an alternative embodiment of the present invention, the mill gear meshing inspection method further includes:

[0071] Before assembling the gear shaft 200 and the gear 300 into the mill transmission box, pre-assembly inspection is carried out on the parts of the gear shaft 200, the gear 300 to be assembled, and the mill transmission box.

[0072] In an alternative example of this embodiment, the pre-assembly inspection includes:

[0073] Using a precision standardization device to conduct gear backlash and meshing area coloring inspections, and in addition, combining conventional inspection measuring tools such as an outside micrometer, an inside micrometer, and a vernier caliper to conduct gear shaft inspections and gear (gear mating inspection standard mandrel) meshing inspections;

[0074] Inspecting the shafting bearing sleeves, bearings and other parts of the mill transmission box.

[0075] In an alternative example, the gear backlash is measured by the dial indicator method or the lead pressing method, and the meshing area coloring inspection is carried out by the coloring inspection method.

[0076] In an alternative example of this embodiment, after the pre-assembly inspection is completed, and the gear meshing backlash is within the design range and the gear coloring area meets the inspection requirements, the shafting bearing sleeves, bearings and other parts of the mill transmission box are inspected to meet the design, specification and standard requirements. The gear shaft 200, the gear 300 and the mill transmission box enter the assembly stage.

[0077] In an alternative embodiment of the present invention, after the assembly is completed, the assembled gear shaft 200 and gear 300 are inspected. When it is found that the gear meshing backlash and the meshing area of the shafting are unreasonable, it is necessary to analyze the specific reasons such as the out-of-tolerance of the shaft hole positioning dimensions, the external dimensions, and the form and position tolerances caused by the welding, heat treatment, and finish machining processes of the mill transmission box body. This requires the mill gear meshing inspection device 100 to simulate the change in the gear meshing state caused by the machining error of the box body bearing hole, further analyze the box body manufacturing problems, and judge whether it can be processed in the assembly workshop for the next step or returned to the factory for processing.

[0078] In an alternative embodiment of the present invention, the parallelism and coaxiality between the gear shaft 200 and the gear 300 are adjusted by the mill gear meshing inspection device 100, including:

[0079] Condition 1: Simulate the out-of-tolerance behavior tolerance of the coaxiality of the housing, and adjust the center positioning of the unilateral bearing hole through the coaxiality gasket group to simulate the gear meshing area of the mill gear; specifically, adding coaxiality adjustment gaskets on one side of the pressing plate 41 can simulate the influence of the coaxiality of the bearing hole on the side clearance and coloring area of the gear meshing; the four pressing plates 41 can be simulated and adjusted in four directions;

[0080] Condition 2: Simulate the out-of-tolerance of the center distance dimension tolerance, and adjust the center distance of the bilateral bearing holes through the parallelism gasket group to simulate the gear meshing area of the mill gear; specifically, adding a parallelism adjustment gasket unilaterally between the split surfaces of the two gear housings 11 (that is, between the second lower bearing seat 15 and the first upper bearing seat 14) can simulate the influence of the parallelism of the shaft hole on the side clearance and coloring area of the gear meshing;

[0081] Condition 3: It is also possible to simulate the side clearance and coloring area of the gear meshing in a more complex situation where the above Conditions 1 and 2 are superimposed, so that the coloring area of the gear shaft and the gear side clearance are closer to the actual processing and assembly states of the assembled modular mill product.

[0082] The mill gear meshing inspection device 100 and method proposed by the present invention are used for the inspection of the gear 300 and the gear shaft 200, as well as the systematic analysis and preliminary judgment of the problems of the mill transmission housing. Before the assembly of the mill transmission housing, after the parts are inspected and it is determined that there is no problem with the meshing of the gear shaft and the gear, the assembly work can be carried out. If the coloring area of the gear meshing after assembly does not meet the expectations, instead of returning the gear 300 and the gear shaft 200 to the factory again, the mill gear meshing inspection device 100 and method proposed by the present invention can be used to further judge the preliminary cause of the housing processing problem, and further inspection and treatment can be carried out, reducing the time for the gear to return to the factory, reducing the transportation and inspection costs of the transmission housing, and meeting the requirements for cost reduction and efficiency improvement in the manufacturing industry.

[0083] The detailed explanations for the above embodiments are only for the purpose of explaining the present invention so that it can be better understood. However, these descriptions cannot be construed as limitations of the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there are clear and opposite descriptions, these features should be understood to be applicable to any one of the embodiments and not limited to the described embodiments.

Claims

1. A rolling mill gear meshing inspection device, characterized in that, The rolling mill gear meshing inspection device includes: A gearbox assembly having two gearbox bodies which are detachably connected. The gearbox assembly has a first side arranged oppositely. Bearing holes are formed in the box walls on the first side of each gearbox body. The connection line of the centers of the two bearing holes is the gear axis, and the gear axes of the two gearbox bodies are arranged in parallel; A standard mandrel is arranged in one of the gearbox bodies, and the two ends of the standard mandrel are respectively rotatably installed in the two bearing holes; A parallelism adjustment assembly is detachably connected to the gearbox assembly, and the parallelism adjustment assembly is used to adjust the parallelism of the two gear axes; A coaxiality adjustment assembly is detachably connected to the gearbox assembly, and the coaxiality adjustment assembly is used to adjust the coaxiality of the two bearing holes of the gearbox body; 2. The mill gear meshing inspection device according to claim 1, characterized in that The two gearbox bodies are arranged one above the other. The gearbox body located below includes a first lower bearing seat and a first upper bearing seat, and the gearbox body located above includes a second lower bearing seat and a second upper bearing seat.

3. The mill gear meshing inspection device according to claim 1, characterized in that, The gearbox assembly further includes a standard box body which is arranged between the two gearbox bodies and is detachably connected to the two gearbox bodies; 4. The rolling mill gear meshing inspection device according to claim 1, characterized in that, A positioning structure is further arranged between the two gearbox bodies. The positioning structure includes a cylindrical pin and two positioning holes. The two positioning holes are respectively formed in the mating surfaces of the two gearbox bodies and are in alignment and fit. The two ends of the cylindrical pin respectively extend into the two positioning holes; 5. The rolling mill gear meshing inspection device according to claim 1, wherein The gearbox body is a rectangular box body. The gearbox assembly further has two second sides arranged oppositely. The parallelism adjustment assembly is arranged on the first side of the gearbox assembly, and the coaxiality adjustment assembly is arranged on the second side of the gearbox assembly; 6. The rolling mill gear meshing inspection device according to claim 5, characterized in that, The parallelism adjustment assembly includes a plurality of stud connectors which are arranged on the box wall on the first side of the gearbox assembly. Each stud connector includes a stud, a parallelism adjustment gasket set and two nuts. The stud sequentially penetrates through the box walls of the two gearbox bodies, and the two nuts are respectively threadedly connected to the two ends of the stud to fixedly connect the two gearbox bodies together. The parallelism adjustment gasket set is arranged between the two gearbox bodies and sleeved outside the stud; 7. The rolling mill gear meshing inspection device according to claim 5, wherein The coaxiality adjustment assembly includes a plurality of pressing plate connectors which are arranged on the box wall on the second side of the gearbox assembly. The pressing plate connectors are respectively fixedly connected to the box walls of the two gearbox bodies. Each pressing plate connector includes a pressing plate, a coaxiality adjustment gasket set and a plurality of bolts. Threaded holes for alignment and fit with the bolts are formed in the box walls of each gearbox body. One end of each bolt penetrates through the pressing plate and is screwed into the threaded hole. The bolt is in threaded fit with the box wall of the gearbox body and presses the pressing plate against the box wall of the gearbox body. The coaxiality adjustment gasket set is sleeved outside the bolt and located between the pressing plate and the box wall of the gearbox body; 8. The rolling mill gear meshing inspection device according to claim 1, wherein, A bearing sleeve is detachably installed in the bearing hole; 9. A method for inspecting the meshing of gears of a rolling mill, characterized in that, The rolling mill gear fitting inspection method includes: Inspect the gear shaft and gear assembled in the rolling mill transmission box and obtain the inspection results; Assemble the gear shaft and the gear on the rolling mill gear meshing inspection device as described in any one of claims 1-8; Adjust the parallelism between the gear shaft and the gear, and the coaxiality of the two bearing holes of the gear box body through the rolling mill gear meshing inspection device, so that the meshing state of the gear shaft and the gear is consistent with the inspection results; Analyze the manufacturing problems of the rolling mill transmission box according to the adjustment data of the parallelism and the coaxiality; 10. The method for inspecting the meshing of rolling mill gears according to claim 9, characterized in that, The rolling mill gear meshing inspection method further includes: Before assembling the gear shaft and the gear into the rolling mill transmission box, conduct pre-assembly inspections on the parts of the gear shaft, the gear and the rolling mill transmission box to be assembled.

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