Main rolling machine joint shaft motor end universal joint with built-in buffering structure

Abstract

The application discloses a main rolling mill joint shaft motor end universal joint with a built-in buffering structure and relates to the technical field of shaft coupling buffering. The motor end flat head is connected with a motor flange; symmetric step surfaces and inner grooves are arranged in the middle part of the motor end flat head towards the joint shaft; the motor end fork head is connected with the joint shaft connecting end; the installation area is provided with an opening, and the inner installation hole is arranged; the pin shaft is installed on the motor end flat head, and the sliding blocks are arranged on the two sides and are constrained in the installation area; the axial buffering device is inlaidly installed in the inner groove of the motor end flat head and is arranged on the pin shaft between the two groups of sliding blocks; the radial buffering device is arranged in two groups and is installed in the installation hole; the integrated shared lubricating oil path is connected with a plurality of oil paths from the motor end fork head, and the oil paths respectively flow through the upper and lower sliding blocks and the motor end flat head, flow into the inner pin shaft and the surface of the axial buffering device, so that the technical problem that the rolling mill joint shaft axial movement damages the transmission joint and the driving motor is solved.

Description

Technical Field

[0001] This invention relates to the field of coupling buffer technology, and more particularly to a universal joint at the motor end of a main mill connecting shaft with a built-in buffer structure. Background Technology

[0002] In hot-rolled, medium-thick plate, and bar / wire steel rolling production lines, the main mill universal joint is a core transmission component connecting the rolls and the main drive motor. During the rolling process, the universal joint is continuously subjected to multiple operating conditions, including uneven thickness of the incoming billet, instantaneous rolling impact loads, roll eccentricity, transmission system assembly clearances, and equipment start-up, shutdown, acceleration, and deceleration impacts. This causes the universal joint to continuously generate unidirectional alternating axial force from the roll end towards the motor end. This axial force is transmitted step by step along the universal joint to the motor side, a common equipment problem that has long existed in the metallurgical rolling mill industry. The traditional standard structure of the motor-end universal joint is a purely rigid assembly structure without a built-in buffer and force relief structure, and there is no effective buffer or force relief channel for the axial force. Under the continuous high-load rolling conditions of steel plants for 24 hours a day, the alternating axial force repeatedly impacts the joint pin and the motor output flange, and the residual axial force is further transmitted to the drive motor spindle and motor bearings.

[0003] Currently, most of the universal joints of the main rolling mills in use in China do not have axial buffer protection structures. They commonly suffer from joint pin breakage, internal bearing seizure, axial wear of motor bearings, and abnormal motor vibration. Frequent equipment failures force the production line to frequently stop for maintenance and replace joint assemblies, resulting in high spare parts procurement costs and significant losses due to downtime.

[0004] Existing technology, such as CN202421281410.3, describes a cross-shaft type universal coupling, including a lubrication assembly disposed within the universal joint fork. This assembly includes a storage component, a positioning component, and a lubricating component. The storage component is located within the universal joint fork, the positioning component is located within the universal joint fork, and the lubricating component is located within the positioning component. The lubrication assembly is equipped with a second spring. Under the return force of the second spring, the feed block can compress the sealing ring, causing the lubricating oil between the sealing ring and the compression block to be compressed. At this time, the lubricating oil is transported to the bearing sleeve through the flow channel V opened on the surface of the compression block, thereby lubricating the balls and preventing oil loss from the bearing. Although a spring is provided radially along the pin shaft, it acts on the separating sealing ring, mainly serving to move the sealing ring relative to the compression block, and cannot provide axial buffering along the pin shaft.

[0005] For example, CN202323087253.0 describes an improved cross-shaped universal joint, whose lubrication assembly includes an oil pipe. The second fork has an oil hole extending from the outside in, with an oil cup at the outer end and a second threaded hole communicating with it at the inner end. The oil pipe's two ends are connected to the first and second threaded holes, respectively. While existing technology allows lubrication at both ends through the cross-shaped through-hole inside the cross shaft via the oil pipe, lubrication is only achieved at the shaft end where the fork is inserted; it cannot lubricate the part connecting to the flat head. Furthermore, neither of the two patent documents provides axial buffering along the pin end.

[0006] Therefore, this invention proposes a universal joint at the motor end of the main mill connecting shaft with a built-in buffer structure. Summary of the Invention

[0007] To overcome the above deficiencies, the present invention features an axial buffer device on the flat end of the motor and a radial buffer device integrated and embedded inside the fork head of the motor end. This eliminates the need to modify the original connecting shaft and the external installation and connection dimensions of the motor. It is specifically designed to absorb the axial movement impact force transmitted from the roller end of the connecting shaft. It can be used for the production and assembly of new rolling mill universal joints, and can also be used for the in-situ modification of existing old rolling mill joints in steel plants. This addresses the industry pain point of axial movement of the rolling mill connecting shaft damaging the transmission joint and drive motor.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure includes:

[0010] The motor end has a flat head that connects to the motor flange; a symmetrical stepped surface is provided in the middle of the flat head facing the shaft, and an inner groove is provided in the stepped surface;

[0011] The motor end fork connects to the shaft connection end; it has an open mounting area with mounting holes inside;

[0012] The pin is installed on the flat end of the motor, and sliders are installed on both sides and constrained within the installation area;

[0013] An axial buffer device is embedded in the inner groove of the flat end of the motor and sleeved on the pin located between the two sets of sliders.

[0014] Two sets of radial buffer devices are provided and installed in the mounting holes to constrain the pins at both ends.

[0015] The integrated shared lubrication circuit has multiple oil passages that enter from the motor end fork head. The oil flows through the upper and lower parts of the slider and the flat head of the motor end, and then into the inside of the pin shaft and the surface of the axial buffer device.

[0016] To address the technical problem that the axial force transmitted by the joint shaft is entirely applied as a rigid load to both ends of the joint pin, and that the alternating load continuously and repeatedly squeezes the end face of the pin, the pin is prone to end face crushing, fatigue cracks or even fracture under long-term impact.

[0017] This invention utilizes the unused stepped space within the flat end cavity of the motor to create a stepped surface and an inner groove, accommodating an axial buffer device. The buffer structure is built into the entire universal joint body, eliminating the need for additional buffer flanges and buffer supports on the outside of the universal joint. It fully preserves all the original equipment's installation and connection dimensions, enabling in-situ installation of the joint in aging rolling mills without modification.

[0018] This invention employs a composite buffer structure combining an elastic body as the primary buffer and an elastic support for secondary shock absorption. It differentiates between large instantaneous impact loads and small-amplitude alternating vibration loads, absorbing energy in stages to adapt to the complex and variable rolling impact conditions of rolling mills, unlike traditional single-spring buffer structures. In a further technical solution, the axial buffer device includes a support body, which is sleeved on a pin.

[0019] The support body has a guide hole, which is set horizontally along the axis of the connecting shaft; an elastic body and an elastic support are installed in the guide hole, and the elastic support and the restraining elastic body are in the guide hole.

[0020] In a further technical solution, the elastomer is a disc spring;

[0021] The elastic support is provided with a ring edge and a shaft. The ring edge is used to flexibly compress multiple sets of elastic bodies. Multiple sets of elastic bodies are provided and are sleeved on the shaft.

[0022] In a further technical solution, the support body is cross-shaped and has a stepped portion; a side slide plate and a support slide plate are respectively installed on both sides of the stepped portion, and both the side slide plate and the support slide plate can be detachably connected to the support body;

[0023] The inner groove is provided with two sets of clamp-shaped constraint supports that are slidably installed on both sides, and the installation direction is along the length direction of the inner groove.

[0024] Oil grooves are provided on both the side slide plate and the support slide plate; two sets of guide holes are provided on both sides of the support body, and the guide holes are blind holes.

[0025] In a further technical solution, a connecting hole is provided on the step surface; the axial buffer device is limited up and down by a slider, and is laterally connected to the connecting hole by a split cover, which is connected to the connecting hole by a bolt, and the movable compression support body is elastically supported towards the split cover.

[0026] In a further technical solution, the mounting hole is a stepped hole, and the radial buffer device includes a sleeve, which is fixedly installed in the mounting hole; the sleeve has a stepped surface and a plug is installed in a limiting manner, and the end of the plug abuts against the end of the pin.

[0027] A disc spring assembly is installed inside the sleeve, which is used to support the movable abutment pin of the plug.

[0028] In a further technical solution, a limiting plate is installed inside the sleeve, and the limiting plate is fitted inside the sleeve; the limiting plate moves along the axis of the sleeve towards the pin and movably abuts against one end of the disc spring assembly.

[0029] A positioning blind hole is provided on the limiting plate, and a sleeve two is coaxially installed thereon; one end of the sleeve two is constrained in the positioning blind hole, and the other end abuts against the end of the plug opposite to the pin shaft.

[0030] The sleeve has an integrally formed annular part, which abuts against the other end of the disc spring assembly.

[0031] In a further technical solution, the port of the mounting hole is provided with a cap; the pin is provided with an axial oil passage and a radial oil passage, and multiple sets of radial oil passages are provided and connected to the surface of the pin; the axial oil passage and the radial oil passage are connected, and the end of the axial oil passage extends to both ends of the pin and connects to the surface.

[0032] In a further technical solution, the motor end fork has multiple sets of oil inlets that flow to the radially distributed surface of the slider; oil storage grooves are provided inside and outside the slider, and oil passages are formed by the oil inlet, one of which flows to the connection between the plug and the pin and flows into the axial oil passage and then into the radial oil passage; another of which flows to the surface of the upper and lower oil storage grooves of the slider; and the other flows into the motor end flat head, the side slide plate and the support slide plate.

[0033] In a further technical solution, a connecting oil passage is provided inside the flat head of the motor end, and a branch oil passage is opened on the connecting oil passage. Both the branch oil passage and the connecting oil passage extend to the surface of the flat head of the motor end; the connecting oil passage is radially distributed along the pin axis and is provided with a cap at both ends; the branch oil passage is perpendicular to the connecting oil passage; the connecting oil passage extends to the surface of the side slide plate.

[0034] This invention features an integrated design of buffer and shared oil circuits, with multiple sets of through-type oil circuits distributed inside the universal joint. A single external oil injection structure simultaneously lubricates multiple working surfaces of the buffer slider friction pair, pin pair, and axial buffer device, simplifying the lubrication pipeline structure and improving the overall lubrication reliability of the joint.

[0035] The present invention has the following beneficial effects:

[0036] This invention absorbs and dissipates most of the axial movement load transmitted by the pin through a built-in buffer assembly. The pin no longer bears rigid axial impact, significantly reducing the pin breakage rate and extending its service life, thus greatly reducing the frequency of replacement of universal joint spare parts. This invention features a specially designed stepped space machined into the inner cavity of the motor-end flat head. The stepped surface serves as the limiting mounting base for the axial buffer device, and the entire buffer assembly is embedded between the inner groove and the pin end face. The external flange of the motor-end flat head retains the original mounting dimensions, allowing direct connection to the original equipment's motor flange and the end of the pin, with zero modification to the overall external assembly dimensions.

[0037] This invention provides an axial buffer device comprising a support body. The cross-shaped support body is fitted with a side slide plate and a support slide plate within an inner groove. An elastic support is installed within a mounting hole via a built-in guide hole. This elastic body acts as the primary load-bearing buffer component, bearing the majority of the axial impact load while absorbing high-frequency, small-amplitude alternating vibration loads during rolling. An oil reservoir is formed on the outer wall of the support slide plate, connecting to a pre-installed through-type oil injection channel inside the flat end, ensuring continuous oil supply and lubrication of the sliding friction pair of the slide plate.

[0038] This invention features a shared oil circuit to achieve synchronous lubrication of the buffer sliding pair and the spherical bearing with a single oil injection. This avoids dry friction and jamming of the buffer pair due to lack of oil, as well as abnormal wear of the bearing due to lack of oil. It also optimizes the sealed operating environment inside the joint and effectively extends the overall service life of the universal joint assembly.

[0039] This invention significantly reduces sudden unplanned downtime caused by universal joint pin breakage and motor damage, improves the effective operating rate of the rolling mill, and reduces the defect rate of rolled steel due to dimensional deviations and surface defects. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the vertical sectional connection of the conventional flat head and fork head along the pin axis;

[0041] Figure 2 This is a schematic diagram of the connection structure of the universal joint at the motor end of the main rolling mill connecting shaft proposed in this invention;

[0042] Figure 3 This is a schematic diagram of the flat head structure of the motor end proposed in this invention;

[0043] Figure 4 This is a schematic diagram of the motor end fork structure proposed in this invention;

[0044] Figure 5 This is a front view of the universal joint at the motor end of the main rolling mill connecting shaft proposed in this invention;

[0045] Figure 6 for Figure 5 AA section diagram;

[0046] Figure 7 for Figure 6 Enlarged view of part B;

[0047] Figure 8 This is a schematic diagram of the elastic support structure of the present invention;

[0048] Figure 9 This is a schematic diagram of the axial buffer device of the present invention;

[0049] Figure 10 This is a side view of the axial buffer device.

[0050] Figure 11 for Figure 6 Enlarged view of part C;

[0051] Figure 12 This is a side view of the universal joint at the motor end of the main rolling mill connecting shaft proposed in this invention;

[0052] Figure 13 for Figure 12 DD sectional view;

[0053] Figure 14 for Figure 13 Enlarged view of part E;

[0054] Figure 15 This is a schematic diagram of the internal oil circuit of the flat end of the motor.

[0055] Figure 16 This is a schematic diagram of the oil circuit inside the motor end fork.

[0056] legend:

[0057] 10. Flat head at motor end; 11. Stepped surface; 12. Inner groove; 13. Connecting hole; 14. Split cover; 15. Closing bolt; 16. Connecting oil passage; 17. Branch oil passage;

[0058] 20. Motor end fork; 21. Mounting area; 22. Mounting hole; 23. End cap; 24. Oil inlet;

[0059] 30. Pin; 31. Slider; 32. Radial oil passage; 33. Axial oil passage;

[0060] 40. Axial buffer device; 41. Support body; 411. Stepped part; 42. Guide hole; 43. Elastic body; 44. Elastic support; 441. Ring edge part; 442. Shaft part; 45. Side slide plate; 46. Support slide plate; 47. Oil groove;

[0061] 50. Radial buffer device; 51. Sleeve 1; 52. Plug; 53. Disc spring assembly; 54. Limiting plate; 55. Sleeve 2. Detailed Implementation

[0062] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0063] Figure 1 As one type of existing universal joint, it uses a fork head and a flat head connected by a pin. The pin is located on the flat head and is connected to the fork head by a slider. The pin is closed by a plug at the mounting hole position.

[0064] Example 1

[0065] like Figure 2-12 As shown, a universal joint at the motor end of a main mill shaft with a built-in buffer structure is provided, comprising:

[0066] like Figure 6 As shown, the flat head 10 at the motor end is connected to the motor flange; a symmetrical stepped surface 11 is provided in the middle of the flat head 10 facing the shaft, and an inner groove 12 is provided in the stepped surface 11.

[0067] The motor end fork 20 is connected to the shaft connection end; it has an open mounting area 21 with mounting holes 22 inside.

[0068] like Figure 6 The central pin 30 is installed on the flat end 10 of the motor, and sliders 31 are installed on both sides and constrained within the installation area 21;

[0069] like Figure 9 As shown, the axial buffer device 40 is embedded in the inner groove 12 of the flat head 10 at the motor end and is sleeved on the pin 30 located between the two sets of sliders 31.

[0070] like Figure 6 As shown, the radial buffer device 50 is provided in two sets and installed in the mounting hole 22, and is used to constrain the two ends of the pin 30.

[0071] An integrated shared lubrication circuit is provided, with multiple oil circuits entering from the motor end fork 20. The oil flows through the upper and lower parts of the slider 31 and the flat head 10 at the motor end, and flows into the interior of the pin 30 and the surface of the axial buffer device 40.

[0072] like Figure 9As shown, the axial buffer device 40 includes a support body 41, which is sleeved on the pin 30; a guide hole 42 is provided in the support body 41, which is horizontally arranged along the axis of the pin; an elastic body 43 and an elastic support 44 are installed in the guide hole 42, and the elastic support 44 and the restraining elastic body 43 are in the guide hole 42.

[0073] like Figure 7 As shown, the elastic body 43 is a disc spring; as Figure 8 As shown, the elastic support 44 is provided with a ring edge portion 441 and a shaft portion 442. The ring edge portion 441 is used to flexibly compress multiple sets of elastic bodies 43. Multiple sets of elastic bodies 43 are provided and are sleeved on the shaft portion 442. Multiple sets of disc springs are provided and installed in series to increase the elastic stroke.

[0074] like Figure 9 As shown, the support body 41 is cross-shaped and has a stepped portion 411; a side slide plate 45 and a support slide plate 46 are respectively installed on both sides of the stepped portion 411, and both the side slide plate 45 and the support slide plate 46 can be detachably connected to the support body 41; the inner groove 12 is provided with two sets and is in the form of a clamp to constrain the sliding installation of both sides of the support body 41, and the installation direction is along the length direction of the inner groove 12.

[0075] Oil grooves 47 are provided on both the side slide plate 45 and the support slide plate 46; two sets of guide holes 42 are provided on both sides of the support body 41, and the guide holes 42 are blind holes.

[0076] like Figure 3 As shown, a connecting hole 13 is provided on the stepped surface 11; the axial buffer device 40 is limited up and down by the slider 31, and is laterally connected to the split cover 14 by the mounting bolt 15, and the movable compression support 41 is elastically supported 44 towards the split cover 14.

[0077] like Figure 4 and 11 As shown, the mounting hole 22 is a stepped hole, and the radial buffer device 50 includes a sleeve 51, which is fixedly installed in the mounting hole 22; the sleeve 51 is provided with a stepped surface 11 and a plug 52 is installed in a limiting manner, and the end of the plug 52 abuts against the end of the pin 30.

[0078] A disc spring assembly 53 is installed inside the sleeve 51, which supports the plug 52 to movably abut against the pin 30. A limiting plate 54 is installed inside the sleeve 51, and the limiting plate 54 is fitted inside the sleeve 51; the limiting plate 54 is movably abutting against one end of the disc spring assembly 53 along the axis of the sleeve 51 toward the pin 30.

[0079] A positioning blind hole is provided on the limiting plate 54, and a sleeve 55 is coaxially mounted thereon; one end of the sleeve 55 is constrained in the positioning blind hole, and the other end abuts against the end of the plug 52 opposite to the pin 30; the sleeve 55 is integrally provided with an annular part, which abuts against the other end of the disc spring assembly 53. A cap 23 is provided at the port of the mounting hole 22;

[0080] This invention is integrally embedded in the stepped inner cavity of the flat head of the motor end. The entire structure includes the flat head of the motor end, the fork head of the motor end, the pin, the axial buffer device, and the radial buffer device. After in-situ assembly, it does not change the external flange of the joint or the external dimensions of the shaft connection end, forming an equivalent replacement, which can greatly reduce the need for equipment replacement in enterprises. The technical advantages of this invention are concentrated in:

[0081] 1) A special stepped space is machined into the inner cavity of the flat head at the motor end. The stepped surface serves as the limiting mounting base for the axial buffer device. The entire buffer assembly is embedded between the inner groove and the end face of the pin shaft. The outer flange of the flat head at the motor end retains the original installation dimensions and can be directly connected to the original equipment motor flange and the end of the connecting shaft. The external assembly dimensions of the whole machine are unchanged.

[0082] 2) The axial buffer device includes a support body. The outer side of the cross-shaped support body is fitted with a side plate and a support plate within an inner groove. An internal guide hole is built in which an elastic support is installed to constrain the elastic body. The elastic body acts as the main load-bearing buffer component, bearing most of the axial impact load, while absorbing the high-frequency, small-amplitude alternating vibration load under rolling conditions. An oil reservoir is opened on the outer wall of the support plate, which is connected to a pre-installed through-hole oil injection circuit inside the flat head to achieve continuous oil supply and lubrication of the sliding friction pair of the plate.

[0083] 3) Radial buffer device, which uses retractable plugs at both ends along the axial direction of the pin to achieve buffering at the pin ends.

[0084] During the rolling process, the shaft experiences axial movement from the roller end to the motor end. The axial force acts on the end face of the pin, and the pin presses against the support slide plate, pushing the entire buffer assembly to compress. The spring buffer assembly and the elastic support undergo controllable elastic deformation, absorbing and dissipating most of the axial impact force step by step. The remaining minimal residual load is directly borne by the flat head inner cavity step, and the axial force is completely isolated and cannot be transmitted to the motor flange and motor body. After the rolling load disappears, the buffer assembly is reset by the spring rebound, continuously and dynamically buffering the axial movement force in a cyclical manner.

[0085] Example 2

[0086] like Figure 12-16 This is another embodiment of the present invention, based on embodiment 1. Figure 14 Different colors are used for differentiation and marking, such as Figure 14On the left side, the pin 30 is provided with an axial oil passage 33 and a radial oil passage 32. The radial oil passage 32 is provided in multiple sets and is connected to the surface of the pin 30. The axial oil passage 33 is connected to the radial oil passage 32, and the end of the axial oil passage 33 extends to both ends of the pin 30 and is connected to the surface.

[0087] like Figure 12 and 16 As shown, the motor end fork 20 has multiple sets of oil inlets 24, which flow to the radially distributed surface of the slider 31, such as... Figure 14 As shown; both the inner and outer sides of the slider 31 are provided with oil storage grooves, and oil passages are formed by oil inlet. One path is brown, which flows to the connection between the plug 52 and the pin 30 and flows into the axial oil passage 33 and then into the radial oil passage 32; another path is blue, which flows to the surface of the upper and lower oil storage grooves of the slider 31; and the other path is red, which flows into the motor end flat head 10, the side slide plate 45 and the support slide plate 46.

[0088] like Figure 14 and 15 As shown, a connecting oil passage 16 is provided inside the flat head 10 of the motor end, and a branch oil passage 17 is opened on the connecting oil passage 16. Both the branch oil passage 17 and the connecting oil passage 16 extend to the surface of the flat head 10 of the motor end; the connecting oil passage 16 is radially distributed along the axis of the pin shaft 30, and is provided with a cap at both ends; the branch oil passage 17 is perpendicular to the connecting oil passage 16; the connecting oil passage 16 extends to the surface of the side slide plate 45.

[0089] This invention adopts an integrated multi-position centralized lubrication oil circuit layout. An external oil inlet is opened on the inner side of the motor end fork head. The motor end flat head is equipped with connecting oil circuits and branch oil circuits. The oil circuit is divided into three parts: one part is connected to the oil storage groove on the outer wall of the support slide plate of the axial buffer device to supply oil for the buffer sliding pair; another part is connected to the pin and the pin buffer device; and the third part is connected to the upper and lower surfaces of the slider along the pin axis, which can simultaneously complete the lubrication of the main working surfaces of the joint slider.

[0090] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A universal joint at the motor end of a main rolling mill shaft with a built-in buffer structure, characterized in that, include: The motor end flat head (10) is connected to the motor flange; a symmetrical stepped surface (11) is provided in the middle of the motor end flat head (10) facing the shaft, and an inner groove (12) is provided in the stepped surface (11). The motor end fork (20) is connected to the shaft connection end; an open mounting area (21) is provided, and a mounting hole (22) is provided inside. A pin (30) is installed on the flat end (10) of the motor, and sliders (31) are installed on both sides and constrained within the installation area (21); An axial buffer device (40) is embedded in the groove (12) of the flat head (10) at the motor end and is sleeved on the pin (30) located between the two sets of sliders (31); Radial buffer devices (50), two sets are provided and installed in the mounting holes (22) to constrain the two ends of the pin (30); The integrated shared lubrication circuit has multiple oil circuits that are connected from the motor end fork (20). The oil circuits flow through the upper and lower parts of the slider (31) and the flat head (10) of the motor end, and flow into the interior of the pin (30) and the surface of the axial buffer device (40).

2. The universal joint at the motor end of the main rolling mill shaft with a built-in buffer structure according to claim 1, characterized in that, The axial buffer device (40) includes a support body (41), which is sleeved on the pin (30); A guide hole (42) is provided in the support body (41), and the guide hole (42) is set horizontally along the axis of the connecting shaft; an elastic body (43) and an elastic support (44) are installed in the guide hole (42), and the elastic support (44) and the constraint elastic body (43) are in the guide hole (42).

3. The universal joint at the motor end of the main rolling mill shaft with a built-in buffer structure according to claim 1, characterized in that, The elastic body (43) is a disc spring; The elastic support (44) is provided with a ring edge (441) and a shaft (442). The ring edge (441) is used to flexibly compress multiple sets of elastic bodies (43). Multiple sets of elastic bodies (43) are provided and are sleeved on the shaft (442).

4. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 2, characterized in that, The support body (41) is cross-shaped and has a stepped portion (411); a side slide plate (45) and a support slide plate (46) are respectively installed on both sides of the stepped portion (411), and both the side slide plate (45) and the support slide plate (46) can be detachably connected to the support body (41); The inner groove (12) is provided with two sets of clamp-shaped constraint supports (41) which are slidably installed on both sides, and the installation direction is along the length direction of the inner groove (12). Oil grooves (47) are provided on both the side slide plate (45) and the support slide plate (46); two sets of guide holes (42) are provided on both sides of the support body (41), and the guide holes (42) are blind holes.

5. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 4, characterized in that, A connecting hole (13) is provided on the step surface (11); the axial buffer device (40) is limited up and down by the slider (31), and is laterally connected to the connecting hole (13) by the installation of the split cover (14), and the split cover (14) is connected to the connecting hole (13) by the installation of the connecting bolt (15), and the movable compression support (41) is elastically supported (44) towards the split cover (14).

6. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 4, characterized in that, The mounting hole (22) is a stepped hole. The radial buffer device (50) includes a sleeve (51) which is fixedly installed in the mounting hole (22). The sleeve (51) has a stepped surface (11) and a plug (52) is installed in a limiting position. The end of the plug (52) abuts against the end of the pin (30). A disc spring assembly (53) is installed inside the sleeve (51) and is used to support the plug (52) to move against the pin (30).

7. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 4, characterized in that, A limiting plate (54) is installed inside the sleeve (51). The limiting plate (54) is fitted inside the sleeve (51). The limiting plate (54) is located on the side of the sleeve (51) facing the pin (30) along the axis of the sleeve (51) and is in movable contact with one end of the disc spring assembly (53). A positioning blind hole is provided on the limiting plate (54), and a sleeve two (55) is coaxially installed; one end of the sleeve two (55) is constrained in the positioning blind hole, and the other end abuts against the end of the plug (52) opposite to the pin (30); The sleeve 2 (55) has an integrally formed annular part, which abuts against the other end of the disc spring assembly (53).

8. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 4, characterized in that, The mounting hole (22) is provided with a cap (23); the pin (30) is provided with an axial oil passage (33) and a radial oil passage (32), the radial oil passage (32) is provided in multiple sets and is connected to the surface of the pin (30); the axial oil passage (33) is connected to the radial oil passage (32), and the end of the axial oil passage (33) extends to both ends of the pin (30) and is connected to the surface.

9. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 4, characterized in that, Multiple sets of oil inlets (24) are provided on the motor end fork (20), which flow to the radially distributed surface of the slider (31); oil storage grooves are provided inside and outside the slider (31), and oil passages are formed by oil inlet. One path flows to the connection between the plug (52) and the pin (30) and flows into the axial oil passage (33), and flows into the radial oil passage (32); one path flows to the surface of the upper and lower oil storage grooves of the slider (31); another path flows into the motor end flat head (10), the side slide plate (45) and the support slide plate (46).

10. A universal joint for the motor end of a main rolling mill shaft with a built-in buffer structure according to claim 9, characterized in that, The motor end flat head (10) is provided with a connecting oil passage (16), and a branch oil passage (17) is provided on the connecting oil passage (16). Both the branch oil passage (17) and the connecting oil passage (16) extend to the surface of the motor end flat head (10). The connecting oil passage (16) is radially distributed along the axis of the pin shaft (30), and both ends are provided with caps. The branch oil passage (17) is perpendicular to the connecting oil passage (16). The connecting oil passage (16) extends to the surface of the side slide plate (45).

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