A semi-closed internal circulation oil path vertical universal coupling, hoisting method and hoisting device

Abstract

This invention discloses a vertical universal coupling, a hoisting method, and a hoisting device, relating to the field of coupling technology. The upper and / or lower joint cross-shaped assembly of this vertical universal coupling includes: a cross shaft and rollers and a bearing outer ring fitted onto the shaft head of the cross shaft; a sealing assembly is provided on the contact surface between the bearing outer ring and the cross shaft, wherein a valve oil seal, a skeleton oil seal A, and an O-ring seal A are sequentially arranged within the guide ring; the cross shaft has two center surfaces, and through holes A are formed on the two center surfaces to connect and communicate with the internal space of the cross shaft, wherein a quick-connect fitting is installed in the through hole A on the inner center surface, connecting and communicating with the shaft body of the splined shaft; a rotary grease nipple is installed in the through hole A on the outer center surface; the splined shaft has a through hole along its central axis, and its head is connected to the quick-connect fitting via an oil pipe and a pipe seat, allowing complete communication between the oil chambers on both sides.

Description

Technical Field

[0001] This invention relates to the field of coupling technology, and more specifically, to a semi-enclosed internal circulation oil circuit vertical universal coupling, a hoisting method, and a hoisting device. Background Technology

[0002] Universal joints are common components in transmission equipment, featuring: 1) large angle compensation capacity; 2) large load-bearing capacity; 3) high transmission efficiency; and 4) smooth operation, low noise, and convenient disassembly and maintenance. They are often used to connect two shafts (driving shaft and driven shaft) in different mechanisms to rotate together and transmit torque. They also have the function of compensating for axial, angular, and radial misalignment between the driving shaft and driven shaft caused by manufacturing errors, installation errors, load deformation, and temperature changes.

[0003] Traditional cross-type universal joints mainly consist of a flange fork, a cross-shaped assembly, a splined shaft assembly, and a splined pair assembly. The flange fork and splined shaft assembly, together with the cross-shaped assembly, form one side of the universal joint. The other side consists of the flange fork, the cross-shaped assembly, and the splined pair assembly. Due to varying operating conditions, some joints need to be installed in confined or enclosed spaces, making daily maintenance difficult and severely impacting production. Poor lubrication can cause the spline teeth to overheat, accelerating wear and even causing twisting and deformation, leading to the loss of the universal joint's telescopic function. In such cases, the entire spline assembly or even the entire shaft must be scrapped. Replacement requires a long time, and insufficient spare parts on-site can cause production line shutdowns. To address the aforementioned issues, for example, patent CN217682910U discloses a waterproof, vertical, retractable cross-shaft universal coupling, which includes a spline shaft, a spline sleeve, a connecting pipe, and two joint cross-shaped couplings. It also includes a waterproof half-cover assembly, a protective cover, and a sealing ring. The spline shaft is connected to the upper joint cross-shaped coupling, the spline sleeve is connected to the connecting pipe, the connecting pipe is connected to the lower joint cross-shaped coupling, and the spline sleeve and spline shaft are connected via a spline pair. The protective cover is fitted onto the spline sleeve, and a sealing ring is provided on the contact surface between the two. The waterproof half-cover assembly is fitted onto the outer edge of the connecting pipe and is located below the protective cover.

[0004] However, the working conditions of the vertical telescopic shaft universal joint used on high-speed wire rod production lines are extremely harsh. During high-speed wire rod production, the large amount of cooling water and the large impact force will directly cause the loss of lubricating grease in the cross-shaped assembly, resulting in poor lubrication. This will accelerate the internal corrosion and wear, thereby shortening the service life of the universal joint, increasing the workload and maintenance costs of on-site repairs, affecting the output of high-speed wire rod, and reducing work efficiency. Summary of the Invention

[0005] 1. The problem to be solved

[0006] To address the problem in existing technologies where moisture intrusion into universal couplings causes internal corrosion and wear of the cross-shaped assembly, this invention provides a semi-closed internal circulation oil circuit vertical universal coupling. This coupling offers excellent sealing, prevents moisture intrusion, reduces internal corrosion and wear of the cross-shaped assembly, and extends its service life.

[0007] The present invention also provides a method and device for hoisting a semi-enclosed internal circulation oil circuit vertical universal coupling, further ensuring the waterproof and sealing effect of the semi-enclosed internal circulation oil circuit vertical universal coupling.

[0008] 2. Technical Solution

[0009] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0010] The first aspect of the present invention provides a semi-enclosed internal circulation oil circuit vertical universal coupling, including a first flange fork, an upper joint cross arm, a spline shaft, a spline sleeve, a connecting pipe, a lower joint cross arm, and a second flange fork;

[0011] Wherein, one end of the spline shaft is connected to the first flange fork through the upper joint cross arm, and the other end is connected to the spline sleeve through a spline pair; one end of the connecting pipe is connected to the spline sleeve, and the other end is connected to the lower joint cross arm through the second flange fork.

[0012] The upper joint cross arm and / or lower joint cross arm includes: a cross shaft and rollers and bearing outer rings fitted onto the shaft head of the cross shaft;

[0013] The outer ring of the bearing is provided with a sealing assembly on the contact surface between the bearing outer ring and the cross shaft. The sealing assembly includes a guide ring, a valve oil seal, a skeleton oil seal A and an O-ring A. The valve oil seal, the skeleton oil seal A and the O-ring A are sequentially arranged inside the guide ring.

[0014] The cross shaft has two center surfaces, and through holes A are provided on the two center surfaces to connect and communicate with the internal space of the cross shaft. A quick-connect fitting is installed in the through hole A on the inner center surface, which is connected and communicates with the shaft body of the spline shaft. A rotary grease fitting is installed in the through hole A on the outer center surface. This structure effectively ensures that the internal space of the cross shaft is completely isolated from the outside.

[0015] The splined shaft has a through hole along its central axis, and its head is connected to the quick-connect fitting via an oil pipe and a pipe seat, so that the oil chambers on both sides are fully connected.

[0016] As described in the background section, the vertical telescopic universal joints used on high-speed wire rod production lines operate under extremely harsh conditions. High-speed wire rod production involves large volumes of cooling water and significant impact forces, which directly cause the loss of lubricating grease within the universal joint assembly. This accelerates internal corrosion and wear, shortening the service life of the universal joint. Failure to replace or maintain it in a timely manner directly impacts the production of the high-speed wire rod production line. The combined structure design of the sealing components, quick-connect couplings, rotary grease fittings, and through-holes in the splined shaft of this invention ensures smooth lubrication while preventing moisture from easily entering the universal joint, reducing internal corrosion and wear of the universal joint assembly and extending its service life. Simultaneously, the combined use of quick-connect couplings and rotary grease fittings greatly improves the convenience of maintenance, reducing repair time and difficulty.

[0017] According to any embodiment of the first aspect of the present invention, a protective cover is provided on the outside of the spline shaft, and an O-ring seal B is provided on the contact surface between the protective cover and the spline shaft. At least one adaptive vent valve is provided on the protective cover, preferably two or more, which can adaptively adjust the internal air pressure of the universal coupling when the universal coupling extends or retracts.

[0018] According to any embodiment of the first aspect of the present invention, the connection position of the spline shaft and the spline sleeve is provided with a pair of welded flanges, the inner side of which is provided with a plurality of threaded blind holes for installing a folding waterproof cover, and the outer side is provided with four evenly distributed semi-circular grooves for installing a limiting ring.

[0019] According to any embodiment of the first aspect of the present invention, an annular wedge-shaped balance block is further included. The annular wedge-shaped balance block is disposed on the outer circumferential surface of the spline shaft, and a through hole is formed in the annular wedge-shaped balance block for fixing with screws. Specifically, an annular stepped groove is provided on the inner side of the spline shaft, and the arc surface of the wedge-shaped balance block contacts the mating surface of the stepped groove, forming a pull-out structure by screw connection. This design features easy adjustment, fast adjustment speed, and convenient maintenance. A buffer pad is provided at the bottom of the balance block to prevent the dynamic balance block from loosening due to long-term vibration.

[0020] According to any embodiment of the first aspect of the invention, the rotary nozzle comprises:

[0021] The rotating assembly includes a rotating seat body, a sealing ring C, a skeleton oil seal B, and a quick-change connector. The quick-change connector has a built-in plug ball and spring to keep the oil chamber normally closed. The rotating seat body is a centrifugally cast part made of brass. The rotating seat body has a through hole in the middle, and an annular groove is formed around the upper and lower end faces of the through hole. The skeleton oil seal B mates with the through hole and is engaged in the annular groove. After the skeleton oil seal B is installed, an annular oil passage is formed in the middle. The left side of the rotating seat body has an external thread that mates with the quick-change connector, and a sealing ring C is installed at the end of the mating surface.

[0022] The oil circuit assembly includes an oil circuit screw, a flat-threaded oil cup, and sealing rings D. The bottom of the oil circuit screw is threaded for mounting on a cross shaft. The oil circuit screw has a hollow oil passage in the middle, which is connected to the annular oil passage. The top of the oil circuit screw has an internal thread for mounting the flat-threaded oil cup. The mounting surfaces of the flat-threaded oil cup and the oil circuit screw are sealed by two symmetrical sealing rings D. The head of the oil circuit screw has a blind hole for installation and is tightened using a C-type wrench.

[0023] The aforementioned rotary grease nipple can be applied to most scenarios requiring lubrication. It has a simple structure, is easy to install, and is small in size. Even in extremely confined spaces, lubrication can be carried out via quick-connect couplings, which can significantly shorten maintenance time and improve work efficiency.

[0024] A second aspect of the present invention provides a hoisting device for the vertical universal coupling described in the first aspect, comprising:

[0025] The C-hook is a welded component, entirely constructed from high-strength carbon steel. The lower end of the hook body has a cavity formed by bending high-carbon steel and welding it with shaped reinforcing plates. The cavity is semi-circular, with several assembly holes on its open surface for inserting quick-release locking blocks. Symmetrical welded reinforcing plates are arranged on the left and right sides of the cavity, each with at least one threaded fastening hole for installing and securing steel cables. The lower end face of the cavity has at least one threaded hole for installing a cable lock head, typically used to fix the flange face of a vertical universal coupling. The upper end of the C-hook body has threaded holes for installing counterweights, and a through hole in the middle for installing lifting lugs.

[0026] The lifting lug assembly installed in the through hole includes a lifting lug, a hinge bolt, and a cotter pin A. The lifting lug is fixed to the upper end of the hook body of the C-hook by the hinge bolt and the cotter pin A.

[0027] It should be noted that, due to space constraints, the installation of roller cylinders, vertical roll motors, and reducers on the platform of the rolling mill stand for adjusting the rolling process often requires the use of large lifting equipment (truck cranes) to hoist the vertical roll couplings, bushings, rolls, and roll bases directly below the reducers across the roller conveyor, which is time-consuming, labor-intensive, and poses significant safety hazards. However, the vertical universal coupling mentioned in the first point, with its unique structure, not only needs to meet the hoisting requirements of confined spaces but also needs to ensure that the waterproof sealing structure of the vertical universal coupling is not affected as much as possible. Therefore, the aforementioned hoisting device can be used for the installation of heavy-duty couplings (vertical universal couplings) or bushings vertically installed between rolling mill stands.

[0028] According to any embodiment of the first aspect of the invention, at least one sliding cable assembly is further included, the sliding cable assembly comprising a locking cable, a pulley, a pulley spindle, a perforated thin round nut, and a cotter pin B. The pulley engages with the narrow face of a C-hook, and the locking cable is fixed to the pulley via the pulley spindle, the perforated thin round nut, and the cotter pin B, for coordinating hoisting. For extra-long components, such as those exceeding 4m in length, the lower end face can be locked, and then the sliding cable assembly can be used to lock its movement, thereby improving the stability of the device during hoisting.

[0029] According to any embodiment of the first aspect of the present invention, the number of sliding cable assemblies is three, one of which is disposed between the lifting lug and the counterweight; the other two are disposed between the lifting lug and the cavity. This design can ensure the lifting requirements of vertical universal couplings and even extra-long components.

[0030] According to any embodiment of the first aspect of the present invention, the quick-release lock block assembly includes a C-shaped plate, a handle, and a guide rod; the lower end of the handle is threaded, the upper end of the guide rod is threaded, the handle and the guide rod are both connected to the C-shaped plate by threads, and the guide rod matches the mounting hole, which is simple in structure and convenient and quick to operate.

[0031] The third aspect of the present invention provides a lifting method using the lifting device described in the second aspect, comprising the steps of: lifting the lifting device so that the arc-shaped surface of the lifting device is engaged in the vertical universal coupling, locking the upper surface end flange; screwing in the cable lock head to lock the lower surface end flange; inserting and fastening steel cable to lock the vertical universal coupling in the arc-shaped cavity; pre-lifting, adjusting the number of counterweights according to the degree of change, and balancing.

[0032] The hoisting device of the present invention can be used in conjunction with overhead cranes, cranes, etc., making full use of the hoisting lug structure of the hoisting device to cooperate with external equipment.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] (1) The semi-closed internal circulation oil circuit vertical universal coupling of the present invention has made technical breakthroughs for the vertical installation of shaft connection in narrow and closed spaces. The oil circuit is changed to a semi-closed internal circulation structure, which makes it difficult for water vapor to invade. It is also equipped with a rotary oil nozzle and an adaptive venting valve, which greatly improves the convenience of maintenance and shortens the maintenance time and maintenance difficulty.

[0036] (2) The semi-closed internal circulation oil circuit vertical universal coupling of the present invention has an annular wedge-shaped balance block on the outer circumferential surface of the spline shaft. The annular wedge-shaped balance block has a through hole and is fixed by screws. It has the characteristics of easy adjustment, fast adjustment speed and convenient maintenance. The bottom of the balance block is provided with a buffer pad to prevent the dynamic balance block from loosening due to long-term vibration. Attached Figure Description

[0037] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0038] Figure 1 This is a three-dimensional structural diagram of the semi-closed internal circulation oil circuit vertical universal coupling of the present invention;

[0039] Figure 2 This is a front view of the semi-closed internal circulation oil circuit vertical universal coupling of the present invention;

[0040] Figure 3 for Figure 2 Sectional view along line AA;

[0041] Figure 4 for Figure 3 Enlarged view of Part I;

[0042] Figure 5 for Figure 3 Enlarged view of Part II;

[0043] Figure 6 This is a schematic diagram of the annular wedge-shaped balance block structure of the semi-closed internal circulation oil circuit vertical universal coupling of the present invention;

[0044] Figure 7 This is a schematic diagram of the folding waterproof cover structure of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0045] Figure 8 This is a schematic diagram of the guide ring structure of the semi-closed internal circulation oil circuit vertical universal coupling of the present invention;

[0046] Figure 9 This is a schematic diagram of the splined shaft structure of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0047] Figure 10 This is a sectional view of the spline shaft of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0048] Figure 11 This is a schematic diagram of the adaptive vent valve structure of the semi-closed internal circulation oil circuit vertical universal coupling of the present invention;

[0049] Figure 12 This is a schematic diagram of the quick-connect joint structure of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0050] Figure 13This is a cross-sectional view of the quick-connect fitting of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0051] Figure 14 This is a three-dimensional structural diagram of the rotating oil nozzle of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0052] Figure 15 This is a front view of the rotating oil nozzle of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0053] Figure 16 This is a cross-sectional view of the rotating oil nozzle of the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0054] Figure 17 This is a schematic diagram of the rotating seat body structure of the rotating oil nozzle of the semi-closed internal circulation oil circuit vertical universal coupling of the present invention.

[0055] Figure 18 This is a three-dimensional structural diagram of the hoisting device for the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0056] Figure 19 This is a three-dimensional structural schematic diagram of the hoisting device for the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention from another perspective.

[0057] Figure 20 This is a front view of the hoisting device for the semi-enclosed internal circulation oil circuit vertical universal coupling of the present invention;

[0058] Figure 21 for Figure 20 Sectional view along the CC line;

[0059] Figure 22 for Figure 20 The right view;

[0060] Figure 23 for Figure 22 Sectional view along line BB;

[0061] Explanation of reference numerals in the attached figures:

[0062] 10. Vertical universal coupling; 11. First flange fork; 12. Upper joint cross-shaped assembly; 13. Splined shaft; 131. Through hole; 132. Oil pipe; 133. Pipe seat; 134. Welded flange; 135. Folding waterproof cover; 136. Limiting ring; 137. Annular wedge-shaped balance block; 14. Splined sleeve; 141. Protective cover; 142. O-ring seal B; 143. Adaptive vent valve; 15. Connecting pipe; 16. Lower joint cross-shaped assembly; 161. Cross shaft; 162. Roller; 163. Bearing outer ring; 164. Through hole A; 17. Second flange fork; 18. Sealing assembly; 181. Guide ring; 182. Valve oil seal; 183. Skeleton oil seal A; 184. O-ring seal A;

[0063] 20. Quick-connect connector;

[0064] 30. Rotary oil nozzle; 31. Rotary assembly; 311. Rotary seat body; 312. Sealing ring C; 313. Skeleton oil seal B; 314. Quick-connect coupling; 315. Plug ball; 316. Spring; 317. Annular oil passage; 32. Oil passage assembly; 321. Oil passage screw; 322. Flat thread oil cup; 323. Sealing ring D; 324. Hollow oil passage;

[0065] 40. Lifting device; 41. C-hook; 411. Cavity; 412. Assembly hole; 413. Reinforcing rib; 414. Fastening cable; 415. Counterweight;

[0066] 42. Lifting lug assembly; 421. Lifting lug; 422. Hinged bolt; 423. Cotter pin A;

[0067] 43. Sliding cable assembly; 431. Locking steel cable; 432. Pulley; 433. Pulley spindle; 434. Hole-drilled thin round nut; 435. Cotter pin B;

[0068] 44. Quick-release lock block assembly; 441. C-shaped plate; 442. Handle; 443. Guide rod. Detailed Implementation

[0069] The following detailed description of exemplary embodiments of the invention is taken with reference to the accompanying drawings, which form part of the description and illustrate exemplary embodiments in which the invention may be practiced. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be implemented and various changes may be made to the invention without departing from the spirit and scope thereof. The more detailed description of embodiments of the invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and not restrictive of the description of the features and characteristics of the invention, to suggest the best mode for carrying out the invention, and is sufficient to enable those skilled in the art to practice the invention. Therefore, the scope of the invention is defined only by the appended claims.

[0070] like Figure 1 As shown, the semi-enclosed internal circulation oil circuit vertical universal coupling 10 of this embodiment includes a first flange fork 11, an upper joint cross arm 12, a spline shaft 13, a spline sleeve 14, a connecting pipe 15, a lower joint cross arm 16, and a second flange fork 17.

[0071] One end of the spline shaft 13 (upper welded flange 134 fork) is connected to the first flange fork 11 through the upper joint cross arm 12, and the other end is connected to the spline sleeve 14 through a spline pair. One end of the connecting pipe 15 is connected to the spline sleeve 14, and the other end (lower welded flange 134 fork) is connected to the lower joint cross arm 16 through the second flange fork 17.

[0072] Combination Figure 4 As shown, the upper joint cross arm 12 and / or the lower joint cross arm 16 include: a cross shaft 161 and rollers 162 and bearing outer ring 163 fitted onto the shaft head of the cross shaft 161. The rollers 162 are placed in the tapered hole of the bearing outer ring 163 and are evenly distributed along the inner wall of the tapered hole.

[0073] exist Figure 4 and Figure 8 In the process, a sealing assembly 18 is provided on the contact mating surface between the outer ring 163 of the bearing and the cross shaft 161. The sealing assembly 18 includes a guide ring 181, a valve oil seal 182, a skeleton oil seal A183, and an O-ring seal A184. The guide ring 181 has an open cross section. The valve oil seal 182, the skeleton oil seal A183, and the O-ring seal A184 are sequentially arranged inside the guide ring 181. This structure effectively ensures that the internal space of the cross shaft 161 is completely isolated from the outside.

[0074] Furthermore, Figure 4The cross shaft 161 shown has two center surfaces (along the width direction of the cross shaft 161), and the two center surfaces have through holes A164 that connect to the internal space of the cross shaft 161 (this space can store lubricating oil). A quick-connect fitting 20 is installed in the through hole A164 on the inner center surface, and its structure is as follows: Figure 12 and Figure 13 As shown, it is connected to the shaft body of the spline shaft 13; a rotary oil nozzle 30 is installed in the through hole A164 on the outer center surface; the design of this structure makes the lubrication oil passage inside the cross shaft 161 unobstructed and has a good sealing effect.

[0075] In this embodiment, as Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown, the splined shaft 13 has a through hole 131 along its central axis. The through hole 131 allows complete communication between the oil chambers on both sides, so the cross-sectional shape of the through hole 131 is not specifically limited. For ease of processing, the cross-section of the through hole 131 is preferably circular, square, or elliptical, etc. The head of the through hole 131 is connected to the quick-connect fitting 20 through an oil pipe 132 and a pipe seat 133, ensuring unobstructed lubrication.

[0076] As described in the background section, the operating conditions of the vertical telescopic shaft universal coupling used on high-speed wire rod production lines are extremely harsh. High-speed wire rod production involves large volumes of cooling water and significant impact forces, which directly cause the loss of lubricating grease within the universal coupling assembly. This accelerates internal corrosion and wear, shortening the service life of the universal coupling. If not replaced or maintained in time, it directly impacts the production of the high-speed wire rod production line. The combined structure design of the sealing component 18, quick-connect coupling 20, rotary grease nipple 30, and through-hole 131 of the splined shaft 13 of this invention ensures smooth lubrication while preventing moisture from easily entering the universal coupling, reducing internal corrosion and wear of the universal coupling assembly, and extending its service life. Simultaneously, the combined use of the quick-connect coupling 20 and rotary grease nipple 30 greatly improves the convenience of maintenance, shortening repair time and reducing repair difficulty.

[0077] In some embodiments of the present invention, such as Figure 3 and Figure 5 As shown, a protective cover 141 is provided on the outer side of the spline shaft 13. An O-ring seal B142 is provided on the contact surface between the protective cover 141 and the spline shaft 13. At least one adaptive vent valve 143 (e.g., Fisher vent valve 289L & 289H series LOC105) is provided on the protective cover 141. Preferably, there are two or more valves. They can adaptively adjust the internal air pressure of the universal coupling when the universal coupling extends or retracts, so that the internal air pressure of the coupling is kept within a relatively constant range.

[0078] Considering the large cooling water volume and high impact force during high-speed wire rod production, such as Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, a pair of welded flanges 134 are provided at the connection position of the spline shaft 13 and the spline sleeve 14. The inner side of the flanges has several threaded blind holes for installing the folding waterproof cover 135, and the outer side has four evenly distributed semi-circular grooves. The limiting ring 136 has two symmetrical threaded through holes for installing the limiting ring 136. During hoisting, a screw needs to be installed to fix the distance between the upper and lower limiting rings and keep the universal coupling in its shortest retracted state. Under working conditions, the screw needs to be removed, or the entire assembly can be removed.

[0079] The aforementioned folding waterproof cover 135 has a telescopic function, which can cover the spline joint when the coupling is extended or retracted, preventing water from entering the spline joint, extending the service life of the spline joint, and thus extending the service life of the universal coupling.

[0080] In practical use, in order to improve the dynamic balance of the universal coupling, such as Figure 5 and Figure 6 As shown, the universal coupling is also equipped with several annular wedge-shaped balance blocks 137. The annular wedge-shaped balance blocks 137 are set on the outer circumferential surface of the spline shaft 13. Through holes are opened on the annular wedge-shaped balance blocks 137 and they are fixed by screws.

[0081] Specifically, the splined shaft has an annular stepped groove on its inner side, and the arc surface of the wedge-shaped balance block contacts the mating surface of the stepped groove, forming a pull-out structure through screw connection. The above structure features easy adjustment, fast adjustment speed, and convenient maintenance. The bottom of the balance block is equipped with a buffer pad (materials such as rubber and polyurethane can be selected) to prevent the dynamic balance block from loosening due to long-term vibration.

[0082] Combination Figure 14 , Figure 15 , Figure 16 and Figure 17 As shown, the rotary nozzle 30 includes a rotary assembly 31, which includes a rotary seat body 311, a sealing ring C312, a skeleton oil seal B313, and a quick-change connector 314. The quick-change connector 314 has a built-in plug ball 315 and a spring 316 to keep the oil chamber normally closed. The rotary seat body 311 is a centrifugally cast part made of brass. The rotary seat body 311 has a through hole in the middle, and an annular groove is formed around the upper and lower end faces of the through hole. The skeleton oil seal B313 is fitted with the through hole and engaged in the annular groove. After the skeleton oil seal B313 is installed, an annular oil passage 317 is formed in the middle. The left side of the rotary seat body 311 has an external thread that fits with the quick-change connector 314, and a sealing ring C312 is installed at the end of the mating surface.

[0083] The oil circuit assembly 32 includes an oil circuit screw 321, a flat-threaded oil cup 322, and a sealing ring D323. The bottom of the oil circuit screw 321 is threaded for mounting on the cross shaft 161. The oil circuit screw 321 has a hollow oil passage 324 in the middle, which is connected to the annular oil passage 317. The top of the oil circuit screw 321 has an internal thread for mounting the flat-threaded oil cup 322. The mounting surfaces of the oil cup and the oil circuit screw 321 are sealed by two symmetrical sealing rings D323 to seal the oil passage. The head of the screw has a blind hole for installation and is tightened using a C-type wrench.

[0084] Due to varying operating conditions, some couplings (vertical universal couplings 10) need to be installed in confined or enclosed spaces, making daily maintenance difficult and severely impacting production rhythm. Poor lubrication leads to increased temperature and accelerated wear of the spline teeth, even causing twisting and deformation, resulting in the universal coupling losing its telescopic function. In such cases, the entire spline or even the entire shaft must be scrapped. Replacement requires a long time, and insufficient spare parts on-site can cause production line shutdowns. Furthermore, grease nipples or flat-button grease cups 322 are prone to difficulties in lubrication and breakage during daily use, and are generally cast parts with low structural strength. The aforementioned rotary grease nipple 30 can be applied to most lubrication scenarios. It has a simple structure, is easy to install, and is small in size. Even in extremely confined spaces, lubrication can be achieved through the quick-change coupling 314, significantly reducing maintenance time and improving work efficiency.

[0085] Combination Figures 18 to 23 As shown, the lifting device 40 for the vertical universal coupling 10 provided by the present invention includes a C-hook 41, a lifting lug assembly 42 and a sliding cable assembly 43, wherein the lifting lug assembly 42 is installed in the through hole.

[0086] exist Figure 18 , Figure 19 and Figure 23 In the process, the C-shaped hook 41 is a flat welded part, which is made of high-strength carbon steel. The lower end of the hook body of the C-shaped hook 41 is provided with a cavity 411. The cavity 411 is made of high-carbon steel bent and combined with special-shaped ribs and welded. The cavity 411 is semi-circular (the arc surface matches the outer circle of the vertical universal coupling 10). The open surface is provided with several assembly holes 412 for inserting quick-release locking block assembly 44.

[0087] Furthermore, such as Figure 18 or Figure 19 As shown, the quick-release locking block assembly 44 includes a C-shaped plate 441, a handle 442, and a guide rod 443. The lower end of the handle 442 is threaded, and the upper end of the guide rod 443 is threaded. Both the handle 442 and the guide rod 443 are connected to the C-shaped plate 441 by threads. The guide rod 443 matches the mounting hole 412. The structure is simple and the operation is convenient and quick.

[0088] To improve the strength of cavity 411, in Figure 21 In the cavity 411, welded reinforcing ribs 413 are symmetrically arranged on the left and right sides. The reinforcing ribs 413 have two threaded fastening holes for installing and fastening steel cables 414. The lower end face of the cavity 411 has two threaded holes for installing cable lock heads, which are usually used to fix the flange face of the vertical universal coupling 10.

[0089] In some embodiments, such as Figure 18 As shown, the upper end of the C-shaped hook 41 is machined with a threaded hole for installing a counterweight 415, and a through hole is opened in the middle for installing a lifting lug assembly 42.

[0090] To accommodate external equipment, the lifting lug assembly 42 includes a lifting lug 421, a hinge bolt 422, and a cotter pin A423. The lifting lug 421 is fixed to the upper end of the hook body of the C-hook 41 by the hinge bolt 422 and the cotter pin.

[0091] It should be noted that, since the platform on the rolling mill stand is equipped with the frame roller cylinders, vertical roller motors, reducers, etc., used to adjust the rolling process, the vertical roller connecting shafts, bushings, rolls, roll bases, etc. directly below the reducers are often subject to space constraints during installation, which often requires the use of large lifting equipment (truck cranes) to cross the roller table for hoisting. This is time-consuming, labor-intensive, and poses significant safety hazards. However, the vertical universal coupling 10 mentioned in the first aspect has a special structure that not only needs to meet the hoisting requirements of narrow and enclosed spaces, but also needs to ensure that the waterproof sealing structure of the vertical universal coupling 10 is not affected as much as possible. Therefore, the hoisting device 40 mentioned above can be used for the installation of heavy-duty connecting shafts (vertical universal coupling 10) or bushings vertically installed between rolling mill stands.

[0092] Combination Figure 18 , Figure 19 , Figure 20 and Figure 23 As shown, the sliding cable assembly 43 includes a locking steel cable 431, a pulley 432, a pulley spindle 433, a perforated thin round nut 434, and a cotter pin B435. The pulley 432 engages with the narrow face of a C-hook 41. The locking steel cable 431 is fixed to the pulley 432 by the pulley spindle 433, the perforated thin round nut 434, and the cotter pin B435, for coordinated hoisting. For extra-long components, such as those exceeding 4m in length, the lower end face can be locked, and then the sliding cable assembly 43 can be used to lock its movement, which can improve the stability of the device during hoisting.

[0093] exist Figure 23 In this design, the sliding cable assembly 43 consists of three sets, one set being located between the lifting lug 421 and the counterweight 415; and two sets being located between the lifting lug 421 and the cavity 411. This design ensures the lifting requirements of the vertical universal coupling 10 and even extra-long components.

[0094] The hoisting method of the hoisting device 40 of the present invention includes the following steps: lifting the hoisting device 40 so that the arc-shaped surface of the hoisting device 40 is engaged in the vertical universal coupling 10, locking the upper surface end flange; screwing in the cable lock head to lock the lower surface end flange; inserting and fastening steel cable 414 to lock the vertical universal coupling 10 in the arc-shaped cavity 411; pre-lifting, adjusting the number of counterweights 415 according to the degree of change, and balancing.

[0095] The hoisting device 40 of the present invention can be used in conjunction with overhead cranes, cranes, etc., making full use of the hoisting lug 421 structure of the hoisting device 40 to cooperate with external equipment.

[0096] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vertical universal coupling (10) comprising a first flange fork (11), an upper joint cross arm (12), a spline shaft (13), a spline sleeve (14), a connecting pipe (15), a lower joint cross arm (16), and a second flange fork (17); wherein One end of the spline shaft (13) is connected to the first flange fork (11) through the upper joint cross arm (12), and the other end is connected to the spline sleeve (14) through a spline pair. One end of the connecting pipe (15) is connected to the spline sleeve (14), and the other end is connected to the lower joint cross arm (16) through the second flange fork (17). The upper joint cross arm (12) and / or lower joint cross arm (16) comprises: a cross shaft (161) and rollers (162) and bearing outer rings (163) fitted onto the shaft head of the cross shaft (161); characterized in that, A sealing assembly (18) is provided on the contact mating surface between the outer ring (163) of the bearing and the cross shaft (161). The sealing assembly (18) includes a guide ring (181), a valve oil seal (182), a skeleton oil seal A (183), and an O-ring seal A (184). The valve oil seal (182), the skeleton oil seal A (183), and the O-ring seal A (184) are sequentially arranged inside the guide ring (181). The cross shaft (161) has two center surfaces, and the two center surfaces are provided with through holes A (164) to connect and communicate with the internal space of the cross shaft (161). The through hole A (164) on the inner center surface is connected to and installed with a quick connector (20), which is connected and communicated with the shaft body of the spline shaft (13); the through hole A (164) on the outer center surface is connected to and installed with a rotary oil nozzle (30). The spline shaft (13) has a through hole (131) along its central axis, and its head is connected to the quick connector (20) through an oil pipe (132) and a pipe seat (133), so that the oil chambers on both sides are fully connected.

2. The vertical universal joint (10) according to claim 1, characterized in that The outer side of the spline shaft (13) is provided with a protective cover (141), and the contact surface between the protective cover (141) and the spline shaft (13) is provided with an O-ring seal B (142), and at least one adaptive vent valve (143) is provided on it, which can adaptively adjust the internal air pressure of the coupling.

3. The vertical universal joint (10) according to claim 1, characterized in that The connection position of the spline shaft (13) and the spline sleeve (14) is provided with a pair of welding flanges (134), with several threaded blind holes on the inner side for installing the folding waterproof cover (135), and four evenly distributed semi-circular grooves on the outer side for installing the limiting ring (136).

4. The vertical universal joint (10) of claim 1, wherein It also includes an annular wedge-shaped balance block (137), which is disposed on the outer circumferential surface of the spline shaft (13). The annular wedge-shaped balance block (137) has through holes and is fixed by screws; and / or, the bottom of the balance block is provided with a buffer pad.

5. The vertical universal joint (10) of claim 1, wherein The rotary nozzle (30) includes a rotary assembly (31), which includes a rotary seat body (311), a sealing ring C (312), a skeleton oil seal B (313), and a quick-connect coupling (314). The quick-connect coupling (314) has a built-in plug ball (315) and a spring (316). The rotary seat body (311) has a through hole in the middle, and an annular groove is formed around the upper and lower end faces of the through hole. The skeleton oil seal B (313) is fitted with the through hole and engaged in the annular groove. After the skeleton oil seal B (313) is installed, an annular oil passage (317) is formed in the middle. The rotary seat body (311) has an external thread on the left side that fits with the quick-connect coupling (314), and a sealing ring C (312) is installed at the end of the mating surface. The oil circuit assembly (32) includes an oil circuit screw (321), a flat-threaded oil cup (322), and a sealing ring D (323). The bottom of the oil circuit screw (321) is threaded for mounting on a cross shaft. The oil circuit screw (321) has a hollow oil passage (324) in the middle, which is connected to the annular oil passage (317). The top of the oil circuit screw (321) has an internal thread for mounting the flat-threaded oil cup (322). The mounting surfaces of the flat-threaded oil cup (322) and the oil circuit screw (321) are sealed by two symmetrical sealing rings D (323). The head of the oil circuit screw (321) has a blind hole for installation.

6. A hoisting device (40) for a vertical universal coupling according to any one of claims 1-5, characterized in that include: The C-shaped hook (41) has a cavity (411) at the lower end of its body. The cavity (411) is semi-circular and has several assembly holes (412) on its open surface for inserting quick-release locking block assemblies (44). The left and right sides of the cavity (411) are symmetrically provided with reinforcing ribs (413). The reinforcing ribs (413) have at least one threaded fastening hole for installing and fastening steel cables (414). The lower end face of the cavity (411) has at least one threaded hole for installing cable lock heads. The upper end of the C-shaped hook (41) has a threaded hole for installing counterweights (415) and a through hole in the middle for installing lifting lug assemblies (42). The lifting lug assembly (42) installed in the through hole includes a lifting lug (421), a hinge bolt (422), and a cotter pin A (423). The lifting lug (421) is fixed to the upper end of the hook body of the C-hook (41) by the hinge bolt (422) and the cotter pin A (423).

7. The lifting device (40) of a vertical universal joint according to claim 6, characterized in that It also includes at least one sliding cable assembly (43), which includes a locking cable (431), a pulley (432), a pulley spindle (433), a perforated thin round nut (434), and a cotter pin B (435). The pulley (432) engages with the narrow face of a C-hook (41), and the locking cable (431) is fixed to the pulley (432) by the pulley spindle (433), the perforated thin round nut (434), and the cotter pin B (435) for coordinated hoisting.

8. The lifting device (40) of a vertical universal joint according to claim 6, characterized in that The number of sliding cable assemblies (43) is 3 sets, one set is set between the lug (421) and the counterweight (415); the other two sets are set between the lug (421) and the cavity (411).

9. The lifting device (40) of a vertical universal joint according to claim 6, characterized in that The quick-release locking block assembly (44) includes a C-shaped plate (441), a handle (442), and a guide rod (443); the lower end of the handle (442) is threaded, the upper end of the guide rod (443) is threaded, the handle (442) and the guide rod (443) are both connected to the C-shaped plate (441) by threads, and the guide rod (443) matches the mounting hole (412).

10. A hoisting method using the hoisting device (40) according to any one of claims 6 to 9, characterized in that, The steps include: lifting the hoisting device (40) so that the arc-shaped surface of the hoisting device (40) is inserted into the vertical universal coupling (10) and locking the upper end flange; screwing in the cable lock head to lock the lower end flange; inserting the fastening steel cable (414) to lock the vertical universal coupling (10) in the arc-shaped cavity (411); pre-lifting, adjusting the number of counterweights (415) according to the degree of change, and balancing.

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