Loadable telescopic cardan shaft, transmission device of rolling mill and application of transmission device in silicon steel wire

Abstract

The invention discloses a loadable telescopic universal shaft, a transmission device of a rolling mill and application of the transmission device in a silicon steel wire, and relates to the technical field of couplings. The driving end unit, the shaft body unit and the execution end unit are connected in sequence; the shaft body unit comprises a spline pair assembly, a protection assembly and an elastic assembly. The spline pair assembly comprises a spline sleeve, a spline shaft, a gland and a tooth-shaped sealing ring, the elastic assembly penetrates through the spline shaft and the spline sleeve, and the spline shaft is inserted into the spline sleeve; the tooth-shaped sealing ring is fixed to the right side of the spline housing through the gland, and dynamic sealing between the spline housing and the spline shaft is achieved. The gland extends upwards to form a protruding part and exceeds the end face of the outer circle of the spline housing. A lip-shaped sealing ring is arranged in the sealing cover, and the inner circle and the outer circle of the lip-shaped sealing ring are matched with the outer circle of the spline housing and an inner hole of the protective cover respectively; and a ventilation plug is arranged on the protective cover, so that an air path in the protective cover is smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of couplings, and more specifically to a load-bearing telescopic universal shaft, a transmission device of a rolling mill and applications in silicon steel wires, especially in electromagnetic silicon steel continuous rolling mills. Background Art

[0002] With the development of high-speed steel rolling, the steel industry is shifting towards high quality, high efficiency and more environmentally friendly directions. Therefore, the quality and life requirements of the core transmission accessories, the cross-axis universal shaft, are becoming higher and higher.

[0003] In the cold rolling industry, silicon steel wire has higher requirements for the transmission device of the rolling mill, and the required dynamic balance accuracy of the universal shaft is as high as G2.5, which can be said to be the ceiling of the high-speed universal shaft. There are currently 5 silicon steel wires in China. The silicon steel sheets produced by them are also called electrical steel. They are important soft magnetic alloys that are indispensable to the power, electronics and military industries. They are also the metal functional materials with the largest output. They are mainly used as the cores of various motors, generators and transformers. Its production process is complex and the manufacturing technology is strict. Foreign production technologies are protected in the form of patents and regarded as the life of the enterprise. The manufacturing technology and product quality of electrical steel sheets are one of the important indicators to measure the level of special steel production and scientific and technological development in a country. The quantity, quality, specifications and grades of cold-rolled electrical steel in my country cannot meet the needs of the development of the energy (power) industry. There is a big gap compared with Japan in production technology, equipment, management and scientific research. The surface quality requirements of silicon steel sheets are extremely high. In order to control the plate shape during the rolling process, the working rolls often need to be rolled by shifting rolls. Therefore, the transmission universal shaft needs to have extremely high dynamic balance accuracy requirements and automatic telescopic function, which can move with the rolling rolls.

[0004] In order to solve the above-mentioned problems, after searching, for example, Chinese patent CN117386711A discloses a high-precision universal joint that can be loaded and retracted, in which the elastic component includes a limit ring, an intermediate pipe, a centering ring, multiple short springs, multiple spacer rings, and a pressure ring; the intermediate pipe is arranged in the holes of the right flange fork, the spline shaft, and the welding fork, and the limit ring, the centering ring, multiple short springs, multiple spacer rings, and the pressure ring are arranged radially from left to right; the left end face of the limit ring contacts the inner hole end face of the right flange fork, and the right end face contacts the centering ring, and the inner hole of the limit ring is matched with the outer circle clearance of the intermediate pipe; a short spring is arranged between the centering ring and the leftmost spacer ring, between adjacent spacer rings, and between the rightmost spacer ring and the pressure ring.

[0005] However, in the structure disclosed in the above patent, the spline shaft is fixed to the welding fork, and the spline sleeve is welded to the right flange fork. Due to the limitations of these structures, when performing a dynamic balancing test, the dynamic balancing detection equipment is directly connected to the roller end sleeve, and then the dynamic balancing test is performed. There is a deviation in the test result, resulting in the dynamic balancing failing to meet the above requirements (dynamic balancing accuracy is as high as G2.5) when the silicon steel wire is used. Summary of the invention

[0006] 1. Problem to be solved

[0007] In view of the problems in the prior art, the present invention provides a load-bearing telescopic universal shaft, a transmission device of a rolling mill and the application of the same to a silicon steel wire, so as to improve the accuracy of dynamic balance testing.

[0008] 2. Technical solution

[0009] In order 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 load-bearing telescopic universal shaft, which comprises a driving end unit, a shaft unit and an execution end unit connected in sequence; wherein:

[0011] The driving end unit includes a reducer end sleeve, a flat key, a driving end flange fork, a first cross shaft assembly, and a left welding fork; the driving end flange fork is connected to the reducer sleeve by a flat key, and is connected to the left welding fork by the first cross shaft assembly;

[0012] The execution end unit comprises a roller end sleeve, a second cross shaft assembly, an end face tooth flange fork and a right side welding fork, wherein the roller end sleeve is meshed with the end face tooth flange fork through the end face teeth, and the right side welding fork is connected with the end face tooth flange fork by the second cross shaft assembly;

[0013] The shaft unit includes a spline subassembly, a protection assembly and an elastic assembly;

[0014] The spline subassembly includes a spline sleeve, a spline shaft, a gland and a toothed sealing ring. The elastic component runs through the interior of the spline shaft and the spline sleeve. The spline shaft is inserted into the interior of the spline sleeve and fixed to the left welding fork. The toothed sealing ring is fixed to the right side of the spline sleeve by the gland to achieve dynamic sealing between the spline sleeve and the spline shaft. The gland extends upward to form a protrusion and exceeds the outer cylindrical end surface of the spline sleeve.

[0015] The protective assembly includes a protective cover, a sealing cover, a lip seal ring and a sealing sleeve. The left side of the protective cover is fixed to the spline shaft, and the right side is connected to the sealing cover and matched through a stopper. A lip seal ring is arranged in the sealing cover, and its inner and outer circles are matched with the outer circle of the spline sleeve and the inner hole of the protective cover respectively. A vent plug A is arranged on the protective cover to facilitate the smooth flow of air in the protective cover.

[0016] The elastic component includes a hollow core shaft, a spring, a positioning ring, a spacer ring and a gasket ring. The hollow core shaft is arranged in the inner hole of the spline shaft. Multiple sections of the spring are sleeved on the hollow core shaft and separated by spacer rings. Positioning rings and gasket rings are respectively arranged at both ends of the hollow core shaft. The positioning ring is fixed on the left welding fork, and the gasket ring is fixed on the right welding fork.

[0017] In order to improve the test accuracy of dynamic balance, the roller end sleeve of the execution end unit can be disassembled, and then the dynamic balance detection equipment is connected to the end face tooth flange fork, and then the dynamic balance test is carried out. After comparing the test results, the dynamic balance accuracy is improved by at least 1%, which provides accuracy guarantee for the transmission device of the silicon steel wire rolling mill. Although the structure disclosed in the prior art CN117386711A still cannot meet the high dynamic balance requirements of the silicon steel wire for the transmission device of the rolling mill (dynamic balance accuracy is as high as G2.5). The spline shaft in the present invention is inserted into the spline sleeve and fixed to the left welding fork; the spline sleeve is connected to the right welding fork, and its structure adopts the opposite design to the patent CN117386711A.

[0018] In addition, the present invention provides a toothed sealing ring on the left side of the spline sleeve, which can prevent grease from being discharged into the interior of the protective cover during the oil filling process, and can also prevent a small amount of dust from entering through the vent plug A, thereby ensuring effective engagement of the spline shaft and the spline sleeve.

[0019] According to any implementation scheme of the first aspect of the purpose of the present invention, the shaft unit also includes a limit assembly, which includes a hollow tube, a baffle and a transition flange located inside the hollow tube, and the transition flange is welded and fixed to the right welding fork; the hollow tube is placed on the outside, one end of which is welded to the transition flange, and the other end is welded to the spline sleeve; one side of the spring rests against the inner side of the transition flange.

[0020] In the present invention, when the load-bearing telescopic universal shaft is in a free state, the spline sleeve will move axially due to the action of the spring force and make the universal shaft longer. In the absence of a limit, the protective cover will be disengaged from the spline sleeve and will not play a sealing role. It will be compressed back again and the seal will be easily damaged. During the transportation and lifting process of the universal shaft, the spline pair will also be easily disengaged, making it difficult to install it back, which will also cause phase error and affect the dynamic balancing accuracy. At the same time, there are also some dangerous situations.

[0021] The present invention provides a pressure cover at the left end of the spline sleeve, whose outer diameter is larger than the outer circle of the spline sleeve (the pressure cover extends upward to form a protrusion and exceeds the outer circle end face of the spline sleeve), and a step is provided in the inner hole of the protective cover. Under the action of the spring force, the protective cover slides to the left, and at the same time, the end face of the spline sleeve blocks the protective cover so that it does not move to the right end, thereby limiting the maximum length of the universal shaft.

[0022] It should be noted that setting a baffle inside the hollow connecting pipe can effectively prevent the universal shaft from shortening due to overpressure during the movement of the rolling roller, causing the toothed sealing ring to be stuck in the outer tooth root of the spline shaft and cause damage to the toothed sealing ring; what is more serious is that not only the sealing sleeve is damaged by contact with the inclined surface of the spline sleeve, but also the sealing effect cannot be achieved; at the same time, the dynamic balance of the universal shaft is affected, and there is a safety hazard when rotating at high speed.

[0023] In addition, through a large number of tests, the inventors were surprised that the baffle can prevent excessive oiling, thereby preventing grease from being injected into the interface, thereby avoiding increasing the weight of the entire universal shaft and affecting the dynamic balance of the universal shaft.

[0024] According to any implementation scheme of the first aspect of the present invention, arc lining plates and flat lining plates are arranged on the inner side of the roller end sleeve; the roller end sleeve can be connected to the rollers of the rolling mill, and the above-mentioned arc lining plates and flat lining plates can improve the wear resistance of the roller end sleeve.

[0025] According to any embodiment of the first aspect of the present invention, a vent plug B is provided on the hollow pipe to discharge the gas in the shaft in real time.

[0026] According to any implementation scheme of the first aspect of the present invention, two lip-shaped sealing rings are arranged in parallel in the sealing cover. It should be emphasized that the present invention is provided with two layers of lip-shaped sealing rings in the protective cover; during the cold rolling process, a large amount of emulsion will be sprayed on the rollers and also on the load-bearing telescopic universal shaft, and some mud and sand will be included in the emulsion. The first layer of lip-shaped sealing ring on the outside serves to block a large amount of water vapor and mud and sand; under the protection of the first layer of lip-shaped sealing ring, the second layer of lip-shaped sealing ring can effectively protect the external water vapor and mud and sand from entering the spline pair, and at the same time, the service life of the second layer of lip-shaped sealing ring is also improved.

[0027] According to any embodiment of the first aspect of the present invention, a dynamic balancing groove A is provided in the circumferential ring of the left welding fork, and a dynamic balancing groove B is provided in the circumferential ring of the right welding fork; the cross-sectional shape of the dynamic balancing groove A and / or the dynamic balancing groove B is trapezoidal.

[0028] According to any embodiment of the first aspect of the present invention, support rollers are provided on the right welding fork and the roller end sleeve to facilitate roller replacement and installation.

[0029] According to any implementation scheme of the first aspect of the purpose of the present invention, an annular groove is provided near the right end of the spline shaft. During the clamping process, it is not easy to make calibration due to the influence of the tooth surface. The annular groove can be used for calibration, which is beneficial to improving the processing accuracy.

[0030] A second aspect of the present invention provides a transmission device for a rolling mill, wherein the universal shaft is the load-bearing telescopic universal shaft described in the first aspect, and the execution end unit is connected to the rolling roller.

[0031] A third aspect of the present invention provides an application of the transmission device of the rolling mill described in the second aspect to a silicon steel wire.

[0032] 3. Beneficial effects

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The load-bearing telescopic universal shaft of the present invention has a detachable actuator end unit (the roller end sleeve and the end face tooth flange fork are connected by bolts). The roller end sleeve of the actuator end unit can be removed, and then the dynamic balancing detection device is connected to the end face tooth flange fork, and then a dynamic balancing test is performed. After comparing the test results, the dynamic balancing accuracy is improved by at least 1%, which provides accuracy guarantee for the transmission device of the silicon steel wire rolling mill;

[0035] (2) The load-bearing telescopic universal shaft of the present invention is provided with a baffle inside the hollow pipe, which can effectively prevent the universal shaft from shortening due to overpressure during the movement of the rolling roller, causing the toothed sealing ring to be stuck in the outer tooth root of the spline shaft, causing damage to the toothed sealing ring; more seriously, not only is the sealing sleeve damaged by contact with the inclined surface of the spline sleeve, but it also fails to achieve a sealing effect; it also affects the dynamic balance of the universal shaft, posing a safety hazard when rotating at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0037] Figure 1 It is a schematic structural diagram of a load-bearing telescopic universal shaft of the present invention;

[0038] Figure 2 It is a schematic structural diagram of a drive end unit of a load-bearing telescopic universal shaft of the present invention;

[0039] Figure 3 It is a schematic diagram of the shaft unit structure of the load-bearing telescopic universal shaft of the present invention;

[0040] Figure 4 It is a schematic structural diagram of the execution end unit of the load-bearing telescopic universal shaft of the present invention;

[0041] Figure 5 for Figure 1 Enlarged view of part C;

[0042] Figure 6 for Figure 1 A magnified view of the D portion;

[0043] Figure 7 for Figure 1 A magnified view of part E;

[0044] Figure 8 for Figure 1 Magnified view of part F;

[0045] Fig. 9 for Figure 1 Cross-section along line AA;

[0046] Fig.10 for Figure 1 Cross-section along line BB.

[0047] Description of reference numerals:

[0048] 10. Drive end unit; 11. Reducer end sleeve; 12. Flat key; 13. Drive end flange fork; 14. First cross shaft assembly; 15. Left side welding fork; 151. Dynamic balance groove A;

[0049] 20. Shaft unit; 21. Spline subassembly; 211. Spline sleeve; 212. Spline shaft; 213. Gland; 214. Toothed seal ring; 215. Ring groove; 22. Protective assembly; 221. Protective cover; 222. Sealing cover; 223. Lip seal ring; 224. Sealing sleeve; 225. Vent plug A; 23. Elastic assembly; 231. Hollow mandrel; 232. Spring; 233. Positioning ring; 234. Spacer ring; 235. Gasket; 24. Limit assembly; 241. Hollow pipe; 242. Baffle; 243. Transition flange; 244. Vent plug B;

[0050] 30. Executing end unit; 31. Roller end bushing; 311. Arc lining plate; 312. Flat lining plate; 32. Second cross shaft assembly; 33. End face tooth flange fork; 34. Right side welding fork; 341. Dynamic balancing groove B. DETAILED DESCRIPTION

[0051] The present disclosure may be more easily understood by reference to the following description in conjunction with the accompanying drawings and examples, all of which constitute a part of the present disclosure. It should be understood that the present disclosure is not limited to the specific products, methods, conditions or parameters described and / or shown herein. Further, the terms used herein are only used for the purpose of describing specific embodiments by way of example and are not intended to be limiting unless otherwise stated.

[0052] It should also be understood that, for the sake of clarity, certain features of the present disclosure may be described herein in the context of separate embodiments, but may also be provided in combination with each other in a single embodiment. That is, unless clearly incompatible or specifically not included, each separate embodiment is considered to be combinable with any other embodiment, and the combination is considered to represent another different embodiment. Conversely, for the sake of simplicity, the various features of the present disclosure described in the context of a single embodiment may also be provided individually or in any sub-combination. Finally, although a particular embodiment may be described as part of a series of steps or part of a more general structure, each step or substructure itself may also be considered to be an independent embodiment.

[0053] Unless otherwise indicated, it should be understood that each individual element in a list and each combination of individual elements in the list will be interpreted as a different embodiment. For example, a list of embodiments represented as "A, B, or C" should be interpreted to include embodiments "A", "B", "C", "A or B", "A or C", "B or C", or "A, B, or C".

[0054] In the present disclosure, the singular forms of the articles "a," "an," and "the" also include the corresponding plural references, and a reference to a specific value includes at least that specific value unless the context clearly indicates otherwise. Thus, for example, a reference to "a substance" is a reference to at least one of that substance and equivalents thereof.

[0055] The terms including ordinal numbers such as "first" and "second" can be used to explain various components or fluids, but these components and fluids are not limited by these terms. Therefore, without departing from the teachings of the present disclosure, these terms are only used to distinguish the component / fluid from another component / fluid.

[0056] When items are described by using the conjunction terms "... and / or...," etc., the description should be understood to include any one of the associated listed items and all combinations of one or more thereof.

[0057] In general, the use of the term "about" indicates an approximate value that may vary depending on the desired properties obtained by the disclosed subject matter, and will be interpreted in a context-dependent manner based on function. Therefore, one of ordinary skill in the art will be able to interpret a certain degree of difference on a case-by-case basis. In some cases, the number of significant figures used when expressing a particular value can be a representative technique for determining the difference allowed by the term "about". In other cases, a gradient in a range of values ​​can be used to determine the range of differences allowed by the term "about". Further, all ranges in this disclosure are inclusive and combinable, and reference to the values ​​stated in the range includes each value within the range.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terms used herein and / or include any and all combinations of one or more of the associated listed items.

[0059] The structure disclosed in the prior art CN117386711A still cannot meet the high dynamic balance requirements of the transmission device of the silicon steel wire rolling mill (dynamic balance accuracy up to G2.5). Figures 1 to 10 As shown, it includes a driving end unit 10, a shaft unit 20 and an execution end unit 30 connected in sequence; the driving end unit 10 includes a reducer end sleeve 11, a flat key 12, a driving end flange fork 13, a first cross shaft assembly 14, and a left welding fork 15; the driving end flange fork 13 is connected to the reducer sleeve by the flat key 12, and is connected to the left welding fork 15 by the first cross shaft assembly 14; the execution end unit 30 includes a roller end sleeve 31, a second cross shaft assembly 32, an end face tooth flange fork 33 and a right welding fork 34, the roller end sleeve is meshed with the end face tooth flange fork through the end face teeth, and the right welding fork is connected to the end face tooth flange fork by the second cross shaft assembly; wherein the inner side of the roller end sleeve 31 is provided with an arc liner 311 and a flat liner 312, as shown in FIG. Fig.10 As shown, the arc lining plate 311 and the flat lining plate 312 can improve the wear resistance of the roller end sleeve 31 .

[0060] The present invention has a lightweight design while ensuring that the working strength is met: for example, the inner hole of the driving end flange fork 13 is hollowed out and the wall thickness is reduced; the wall thickness of the spline sleeve 211 is reduced, the length of the spline sleeve 211 is shortened, the inside of the spline shaft 212 is hollowed out, and the inner hole of the right welding fork 34 is also hollowed out. In high-speed (rotating speed of 1000-1300r / min) rotary motion, the lighter the weight, the smaller the moment of inertia, and the smaller the centrifugal force of the shaft, which significantly improves the dynamic balance accuracy of the shaft and the service life of the first cross shaft assembly and the second cross shaft assembly.

[0061] Further, such as Figure 3 As shown, the shaft unit 20 includes a spline subassembly 21 , a protection assembly 22 and an elastic assembly 23 .

[0062] Combination Figure 5 and Figure 6As shown, the spline subassembly 21 includes a spline sleeve 211, a spline shaft 212, a pressure cover 213 and a toothed sealing ring 214, the elastic component 23 passes through the interior of the spline shaft 212 and the spline sleeve 211, the spline shaft 212 is inserted into the spline sleeve 211, and is fixed to the left welding fork 15; the spline sleeve 211 is connected to the right welding fork 34; the toothed sealing ring 214 is fixed to the right side of the spline sleeve 211 by the pressure cover 213 to achieve dynamic sealing between the spline sleeve 211 and the spline shaft 212; the pressure cover 213 extends upward to form a protrusion and exceeds the outer cylindrical end face of the spline sleeve 211, the exceeding height is 10-20mm, and there is always a gap between the pressure cover 213 and the protective cover 221 to avoid motion interference.

[0063] The teeth of the spline shaft 212 and the spline sleeve 211 are centered by large diameter, the spline sleeve 211 is ground, and the outer circle of the spline shaft 212 is ground, which ensures that the spline shaft 212 is always in a coaxial state when it is extended and retracted in the spline sleeve 211, thereby ensuring the dynamic balance accuracy.

[0064] In this embodiment, the protective assembly 22 includes a protective cover 221, a sealing cover 222, two lip-shaped sealing rings 223 and a sealing sleeve 224. The left side of the protective cover 221 is welded to the spline shaft 212 (on the outer circle and connected by sealing welding), and the right side is connected to the sealing cover 222 and matched by a stopper; a vent plug A225 is provided on the protective cover 221 to facilitate the smooth flow of air inside the protective cover 221; two lip-shaped sealing rings 223 are provided in the sealing cover 222, and their inner and outer circles respectively match the outer circle of the spline sleeve 211 and the inner hole of the protective cover 221.

[0065] The present invention provides a toothed sealing ring 214 on the left side of the spline sleeve 211, which can prevent grease from being discharged into the interior of the protective cover 221 during the oil filling process, and can also prevent a small amount of dust from entering through the vent plug A225, thereby ensuring effective engagement between the spline shaft 212 and the spline sleeve 211.

[0066] Furthermore, the elastic component 23 passes through the inside of the spline shaft 212 and the spline sleeve 211. The elastic component 23 is arranged in the middle of the spline sub-assembly 21. When the roller moves axially, the universal shaft can automatically follow within a certain telescopic range.

[0067] like Figure 2 , Figure 3 and Figure 4As shown, the elastic component 23 includes a hollow core shaft 231, a spring 232, a positioning ring 233, a spacer ring 234 and a gasket 235. The hollow core shaft 231 is arranged in the inner hole of the spline shaft 212, and the multi-section spring 232 is sleeved on the hollow core shaft 231 and separated by the spacer ring 234; a positioning ring 233 and a gasket 235 are respectively arranged at both ends of the hollow core shaft 231, the positioning ring 233 is fixed on the left welding fork 15, and the gasket 235 is fixed on the right welding fork 34.

[0068] The elastic component 23 of the present invention changes the previous overall welding type and adopts a hollow core shaft 231, which greatly reduces the weight of the component. It can float inside and is convenient for disassembly and assembly; nylon positioning rings 233 and nylon gasket rings 235 are respectively arranged at both ends of the hollow core shaft 231 to play a positioning and buffering role to prevent damage during movement; a series spring 232 is adopted, which is effective and easy to manufacture, and a spacer ring 234 (copper slider) is used to separate the springs 232; the copper slider adopts sliding lubrication and has graphite on its surface.

[0069] In order to correct or minimize the imbalance of the universal joint, the appropriate balance level should be selected according to the needs, and after the product is manufactured and installed on the machine, the balance level requirements should be achieved by adding or reducing appropriate weight on the balance (correction) plane specified by the universal joint.

[0070] For the load-bearing telescopic universal shaft of the present invention, a rolling mill universal shaft dynamic balancing machine-1000 type is used for dynamic balancing test. In order to improve the test accuracy of dynamic balancing, the roller end sleeve 31 of the execution end unit 30 can be disassembled, and then the dynamic balancing detection equipment is connected to the end face tooth flange fork 33, and then the dynamic balancing test is carried out. After comparing the test results, the dynamic balancing accuracy is improved by at least 1%, which provides accuracy guarantee for the transmission device of the silicon steel wire rolling mill; at the same time, the feedback of dynamic balancing data is conducive to making reasonable modifications and improvements to the structure of the universal shaft. Therefore, the spline shaft 212 in the present invention is inserted into the spline sleeve 211 and fixed to the left welding fork 15; the spline sleeve 211 is connected to the right welding fork 34, and its structure adopts the opposite design to the patent CN117386711A.

[0071] like Figure 1 , Figure 3 , Figure 7 and Figure 8As shown, the shaft unit 20 also includes a limit assembly 24, which includes a hollow tube 241, a baffle 242 and a transition flange 243 located inside the hollow tube 241, and the transition flange 243 is welded and fixed to the right welding fork 34; the hollow tube 241 is placed on the outside, one end of which is welded to the transition flange 243, and the other end is welded to the spline sleeve 211; one side of the spring 232 is against the inner side of the transition flange 243.

[0072] In the present invention, when the load-bearing telescopic universal shaft is in a free state, due to the force of the spring 232, the spline sleeve 211 will move axially and make the universal shaft longer. In the absence of a limit, the protective cover 221 will be disengaged from the spline sleeve 211 and will not play a sealing role. It will be compressed back again, which is easy to damage the seal. During the transportation and lifting process of the universal shaft, the spline pair (the name of the combination of the spline sleeve and the spline shaft) is also easy to be disengaged, which is difficult to install back, and will also cause phase error, affecting the dynamic balance accuracy. At the same time, there are also some dangerous situations.

[0073] The present invention provides a pressure cover 213 at the left end of the spline sleeve 211, and its outer diameter is larger than the outer circle of the spline sleeve 211 (the pressure cover 213 extends upward to form a protrusion and exceeds the outer circle end face of the spline sleeve 211), and a step is provided in the inner hole of the protective cover 221. Under the action of the spring 232, the protective cover 221 slides to the left, and at the same time, the end face of the spline sleeve 211 blocks the protective cover 221 so that it does not move to the right end, thereby limiting the maximum length of the universal shaft.

[0074] It should be noted that a baffle 242 is arranged inside the hollow tube 241. The material of the baffle 242 is the same as that of the hollow tube 241, for example, Q235, etc. The baffle 242 is in a circular ring shape, and the circumferential direction of the baffle 242 is welded to the inner wall of the hollow tube 241, which can effectively prevent the overpressure during the movement of the roller from causing the universal shaft to shorten, causing the toothed sealing ring 214 to be stuck in the outer tooth root of the spline shaft 212, causing damage to the toothed sealing ring 214; what is more serious is that not only the sealing sleeve 224 is damaged by contact with the inclined surface of the spline sleeve 211, but also the sealing effect cannot be achieved; at the same time, the dynamic balance of the universal shaft is affected, and there is a great safety hazard during high-speed (rotational speed of 1000-1300r / min) rotational motion.

[0075] Since a cavity is formed around the hollow pipe 241, the transition flange 243 and the hollow core shaft 231, the cavity can store the gas generated by high-speed rotation. When the rotation stops, the gas in the cavity will overflow along the gap between the baffle 242 and the spring. A vent plug B244 is provided on the hollow pipe 241, which can discharge the gas in the shaft in real time, thereby facilitating the smooth flow of the gas path inside the spline pair.

[0076] However, through a large number of tests, it was found that when grease was actually injected, the amount injected was much larger than the designed theoretical amount. When the product was subsequently subjected to dynamic balancing tests, the dynamic balance of the universal shaft did not meet the design requirements. The reason for this is that a large amount of grease was injected into the cavity, which not only affected the storage of the gas, but also the grease had a high density and the cavity had a large volume, which increased the weight of the entire universal shaft, thereby affecting the dynamic balance of the universal shaft. The present invention can prevent excessive oiling through the design of the baffle 242, thereby preventing grease from being injected into the cavity inside the interface; on the other hand, the grease located at the spline pair can be gathered at the connection between the hollow pipe and the baffle 242 (close to the spline pair side) under the action of the centrifugal force of high-speed rotation, and will not enter the cavity due to high-speed rotation, thereby avoiding the increase in the weight of the entire universal shaft and ensuring the dynamic balance requirements of the universal shaft (dynamic balancing accuracy is higher than G2.5).

[0077] In some embodiments of the present invention, Figure 6 As shown, two lip-shaped sealing rings 223 are arranged in parallel in the sealing cover 222, and the lips of the lip-shaped sealing rings 223 face the execution end. It should be emphasized that the present invention is provided with two layers of lip-shaped sealing rings 223 in the protective cover 221; during the cold rolling process, a large amount of emulsion will be sprayed on the roller (the execution end unit 30 is connected to the roller), and will also be sprinkled on the load-bearing telescopic universal shaft. Some mud and sand are included in the emulsion, and the first layer of lip-shaped sealing ring 223 on the outside serves to block a large amount of water vapor and mud and sand; under the protection of the first layer of lip-shaped sealing ring 223, the second layer of lip-shaped sealing ring 223 can effectively protect the external water vapor and mud and sand from entering the spline pair, and at the same time, the service life of the second layer of lip-shaped sealing ring 223 is also improved.

[0078] Combination Figure 2 and Figure 4 As shown, a dynamic balancing groove A151 is circumferentially provided on the left welding fork 15, and a dynamic balancing groove B341 is circumferentially provided on the right welding fork 34; the cross-sectional shape of the dynamic balancing groove A151 and / or the dynamic balancing groove B341 is trapezoidal, and is equipped with a dynamic balancing block, which can conveniently adjust the remaining balance amount without spot welding and is aesthetically pleasing.

[0079] Combination Figure 7 As shown, a roller (not marked in the figure) is provided on the right welding fork 34 and the roller end sleeve 31, which can facilitate roller replacement and installation. An annular groove 215 is provided near the right end of the spline shaft 212. During the clamping process, it is not easy to make a table correction due to the influence of the tooth surface. The annular groove 215 can be used for table correction, which is conducive to improving the processing accuracy.

[0080] The load-bearing telescopic universal shaft of the present invention has the advantages of high speed, high precision, light weight, automatic telescoping, etc. It provides a reliable product and meets the high-quality requirements of users.

[0081] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A load-bearing telescopic universal shaft, comprising a driving end unit (10), a shaft unit (20) and an execution end unit (30) connected in sequence; wherein: The driving end unit (10) comprises a reducer end sleeve (11), a flat key (12), a driving end flange fork (13), a first cross shaft assembly (14), and a left welding fork (15); the driving end flange fork (13) is connected to the reducer sleeve, and is connected to the left welding fork (15) by the first cross shaft assembly (14); the characteristic is that: The execution end unit (30) comprises a roller end sleeve (31), a second cross shaft assembly (32), an end face tooth flange fork (33) and a right side welding fork (34); the roller end sleeve (31) and the end face tooth flange fork (33) are meshed with each other through the end face teeth; and the right side welding fork (34) is connected to the end face tooth flange fork (33) by the second cross shaft assembly (32); The shaft unit (20) comprises a spline subassembly (21), a protection assembly (22) and an elastic assembly (23); The spline subassembly (21) comprises a spline sleeve (211), a spline shaft (212), a pressure cover (213) and a toothed sealing ring (214); the elastic component (23) penetrates the interior of the spline shaft (212) and the spline sleeve (211); the spline shaft (212) is inserted into the interior of the spline sleeve (211) and is fixed to the left welding fork (15); the toothed sealing ring (214) is fixed to the right side of the spline sleeve (211) by the pressure cover (213) to achieve dynamic sealing between the spline sleeve (211) and the spline shaft (212); the pressure cover (213) extends upward to form a protrusion and exceeds the outer cylindrical end surface of the spline sleeve (211); The protection assembly (22) comprises a protection cover (221), a sealing cover (222), a lip seal ring (223) and a sealing sleeve (224); the left side of the protection cover (221) is fixed to the spline shaft (212), and the right side is connected to the sealing cover (222) and matched through a stopper; a lip seal ring (223) is arranged in the sealing cover (222), and its inner and outer circles respectively match the outer circle of the spline sleeve (211) and the inner hole of the protection cover (221); a vent plug A (225) is arranged on the protection cover (221); The elastic component (23) comprises a hollow core shaft (231), a spring (232), a positioning ring (233), a spacer ring (234) and a gasket ring (235); the hollow core shaft (231) is arranged in the inner hole of the spline shaft (212); a plurality of sections of the spring (232) are sleeved on the hollow core shaft (231) and are separated by the spacer ring (234); a positioning ring (233) and a gasket ring (235) are respectively arranged at both ends of the hollow core shaft (231); the positioning ring (233) is fixed on the left welding fork (15), and the gasket ring (235) is fixed on the right welding fork (34).

2. The load-bearing telescopic universal shaft according to claim 1, characterized in that: The shaft unit (20) further comprises a limit assembly (24), the limit assembly (24) comprising a hollow pipe (241), a baffle (242) located inside the hollow pipe (241) and a transition flange (243), the transition flange (243) being welded and fixed to the right welding fork (34); the hollow pipe (241) is placed on the outside, one end of which is welded to the transition flange (243) and the other end of which is welded to the spline sleeve (211); one side of the spring (232) is against the inner side of the transition flange (243).

3. The load-bearing telescopic universal shaft according to claim 2, characterized in that: An arc lining plate (311) and a flat lining plate (312) are arranged inside the roller end sleeve (31).

4. The load-bearing telescopic universal shaft according to claim 3, characterized in that: A vent plug B (244) is provided on the hollow pipe (241).

5. The load-bearing telescopic universal shaft according to claim 4, characterized in that: Two lip-shaped sealing rings (223) are arranged in parallel in the sealing cover (222).

6. The load-bearing telescopic universal shaft according to claim 5, characterized in that: A dynamic balancing groove A (151) is provided circumferentially on the left welding fork (15), and a dynamic balancing groove B (341) is provided circumferentially on the right welding fork (34); the cross-sectional shape of the dynamic balancing groove A (151) and / or the dynamic balancing groove B (341) is trapezoidal.

7. The load-bearing telescopic universal shaft according to claim 6, characterized in that: Support rollers are arranged on the right welding fork (34) and the roller end sleeve (31).

8. The load-bearing telescopic universal shaft according to claim 7, characterized in that: An annular groove (215) is provided near the right end of the spline shaft (212).

9. A transmission device for a rolling mill, comprising a universal shaft, characterized in that: The universal shaft is a load-bearing telescopic universal shaft as claimed in any one of claims 1 to 8, and the execution end unit (30) is connected to a roller.

10. Application of the transmission device of a rolling mill as claimed in claim 9 to a silicon steel wire enables the dynamic balancing accuracy to reach up to G2.5.

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