A locking mechanism for a cemented carbide composite roll based on double-wedge ring locking

Abstract

The utility model discloses a kind of hard alloy composite roll locking mechanisms based on double wedge-shaped ring locking, it is related to steel rolling technical field.The locking mechanism includes pressure locking mechanism, mechanical nut, thrust spacer ring and thrust column, the roll ring, thrust spacer ring, mechanical nut are sequentially and parallelly sleeved in roll shaft outside, and mechanical nut is threadedly cooperated with roll shaft;The pressure locking mechanism is sleeved in thrust spacer ring outside, is made of first wedge-shaped ring and second wedge-shaped ring that are mutually engaged, first wedge-shaped ring is attached with roll ring end face, and second wedge-shaped ring is attached with mechanical nut end face;The mechanical nut is provided with several circumferential uniform distribution thrust holes, and thrust hole is axially through, and the thrust column is arranged in the thrust hole of mechanical nut.The utility model is locked by the pressure locking mechanism of double wedge-shaped ring, combined with mechanical nut, realized long-term dependence on hydraulic maintenance without lasting locking, significantly improve the reliability and service life of locking mechanism, and reusable installation hydraulic nut is used, manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel rolling, in particular to a cemented carbide composite roll locking mechanism based on double wedge ring locking. Background Art

[0002] Cemented carbide composite rolls are key components of steel rolling equipment, and reliable locking between the roll shaft and the roll ring is of critical importance. At present, such locking often adopts a hydraulic nut mechanism, which applies a huge axial locking force to one end of the roll ring to achieve fixation. However, the existing hydraulic nuts have poor long-term use reliability, are prone to liquid leakage and pressure relief during the operation of the composite roll, have insufficient service life, and have high manufacturing costs. Therefore, it has become an urgent demand to improve the locking effect of the locking mechanism while reducing the manufacturing cost. Contents of the Utility Model

[0003] In view of the above technical problems, the utility model proposes a cemented carbide composite roll locking mechanism based on double wedge ring locking.

[0004] The technical scheme adopted by the utility model is as follows: A cemented carbide composite roll locking mechanism based on double wedge ring locking, the composite roll comprises a roll shaft and a roll ring, the locking mechanism comprises a pressure-bearing locking mechanism, a mechanical nut and a thrust spacer ring, the roll ring, the thrust spacer ring and the mechanical nut are sequentially sleeved on the outside of the roll shaft side by side, and the mechanical nut is in threaded fit with the roll shaft; the pressure-bearing locking mechanism is sleeved on the outside of the thrust spacer ring and consists of a first wedge ring and a second wedge ring that are engaged with each other, the first wedge ring is attached to the end face of the roll ring, and the second wedge ring is attached to the end face of the mechanical nut; the mechanical nut is provided with a plurality of thrust holes uniformly distributed in the circumferential direction, and the thrust holes penetrate in the axial direction.

[0005] Preferably, each of the first wedge ring and the second wedge ring comprises a flat end face and a toothed face, the toothed face is provided with circumferentially distributed wedge teeth, the tooth top line of each wedge tooth is parallel to the radial direction of the wedge ring, and the tooth face of each wedge tooth is a flat inclined plane. When the first wedge ring and the second wedge ring rotate in opposite directions, the engaged wedge teeth will push against each other to prop open the gap between the first wedge ring and the second wedge ring.

[0006] Preferably, the included angle θ formed between the tooth face of the wedge tooth and the plane perpendicular to the axial direction satisfies the inequality θ<arctan(μ), where μ is the surface friction coefficient of the wedge tooth. Under this condition, the wedge teeth will not slide backward, thereby locking the gap expanded by the rotation of the wedge rings.

[0007] Preferably, the thrust spacer ring is in clearance fit with the roll shaft to minimize the frictional resistance generated during the installation process and ensure smooth thrust transmission.

[0008] Preferably, the device further includes a hydraulic nut for installation and several thrust columns. During the installation of the locking mechanism, the hydraulic nut for installation is sleeved on the end of the mechanical nut away from the roller ring, and the thrust columns are disposed in the thrust holes of the mechanical nut. The hydraulic nut for installation includes an outer ring and an inner ring of the hydraulic nut that are axially slidably connected, with a hydraulic cavity between the outer ring and the inner ring. The outer ring of the hydraulic nut has an oil hole communicating with the outside and the hydraulic cavity. The outer ring of the hydraulic nut is axially fixedly connected to the mechanical nut. One end of the thrust column abuts against a thrust spacer ring, and the other end abuts against the inner ring of the hydraulic nut. The hydraulic nut and thrust columns are temporary installation tools in the locking mechanism of this invention and can be reused. By applying a uniform axial locking force to the roller ring hydraulically, and locking the obtained locking force through the pressure locking mechanism and the mechanical nut, a strong and stable locking effect is achieved.

[0009] Preferably, the mechanical nut has external threads on its side, and the hydraulic nut has an extension surrounding the mechanical nut on its outer ring. The inner side of the extension has internal threads that mesh with the external threads of the mechanical nut, thus achieving a stable connection between the hydraulic nut and the mechanical nut. The thrust column and the thrust hole of the mechanical nut have a clearance fit, reducing frictional resistance during installation and ensuring smooth thrust transmission.

[0010] Preferably, in the hydraulic chamber, the inner wall surface of the outer ring of the hydraulic nut is provided with a circumferentially extending drainage groove, and the drainage groove is directly connected to the oil hole. In the initial stage of pressurization, the oil first fills the drainage groove and then pushes the inner ring to move, which can avoid uneven force application caused by uneven oil injection.

[0011] Preferably, it also includes a plug, which is installed at the end of the thrust hole of the mechanical nut to prevent foreign objects from entering the thrust hole and protect the internal mechanical structure.

[0012] Preferably, the mechanical nut is provided with a plug mounting hole, which is coaxial with the thrust hole; the plug includes an integrally formed plug body and a cap head; after the locking mechanism is installed, the cap head of the plug is fitted into the plug mounting hole, and the plug body is inserted into the thrust hole, thereby realizing the rapid positioning and installation of the plug.

[0013] Preferably, the bottom of the plug mounting hole is provided with a screw hole, and the cover head is provided with several screw holes. After the locking mechanism is installed, the screw is screwed into the bottom screw hole of the plug mounting hole through the screw hole of the cover head. An O-ring is also provided between the plug body and the thrust hole to achieve reliable fixing and sealing, and to prevent the plug from loosening and falling off under vibration conditions.

[0014] This invention employs a pressure-operated locking mechanism composed of interlocking wedge-shaped rings. The axial length can be expanded through relative rotation, and the wedge-tooth angle design ensures self-locking under pressure. The powerful locking force provided by the hydraulic nut is transferred to the mechanical nut, utilizing the mechanical nut's superior long-term locking reliability to maintain the locking effect. The hydraulic nut used for installation in this invention is reusable, eliminating the need for a separate hydraulic nut for each locking mechanism and reducing manufacturing costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a carbide composite roller locking mechanism based on double wedge ring locking during the installation process of this utility model; Figure 2 This is a schematic diagram of the structure of a carbide composite roller locking mechanism based on double wedge ring locking after installation. Figure 3 for Figure 2 A magnified view of the area indicated by the dashed circle.

[0016] Reference numerals: 1-First wedge ring, 2-Second wedge ring, 3-Mechanical nut, 4-Plug, 41-Cap, 42-Plug body, 43-Screw, 44-O-ring seal, 5-Thrust spacer ring, 6-Thrust column, 7-Hydraulic nut for installation, 71-Outer ring of hydraulic nut, 72-Inner ring of hydraulic nut, 73-Oil hole, 74-Drainage groove, 8-Roller shaft, 9-Roller ring, 10-Threaded hole. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] like Figure 1-3 As shown, a carbide composite roller locking mechanism based on double wedge ring locking includes a first wedge ring 1, a second wedge ring 2, a mechanical nut 3, a plug 4, a thrust spacer 5, a thrust column 6, and a hydraulic nut 7 for installation. The carbide composite roller includes a roller shaft 8 and a roller ring 9.

[0019] Roller ring 9, thrust spacer 5, and mechanical nut 3 are sequentially and side-by-side fitted around roller shaft 8, with the mechanical nut 3 having a threaded fit with roller shaft 8. Thrust spacer 5 has a clearance fit with roller shaft 8 at its mounting location to prevent mechanical interference between the thrust spacer 5 and the external threads of roller shaft 8. Thrust spacer 5 is made of hard alloy to prevent breakage due to insufficient compressive strength during use.

[0020] The first wedge ring 1 and the second wedge ring 2 are identical in structure and size. Each wedge ring comprises two end faces, one of which is a flat end face, and the other is a toothed face provided with circumferentially distributed wedge teeth. The tooth tip line of each wedge tooth is parallel to the radial direction of the wedge ring, the tooth face of the wedge tooth is an inclined face, and the included angle formed between the tooth face and the plane perpendicular to the axial direction is the angle θ of the wedge tooth. The angle θ of the wedge tooth satisfies θ<arctan(μ), where μ is the friction coefficient of the wedge tooth surface. The wedge teeth of the first wedge ring 1 and the second wedge ring 2 are engaged with each other, the flat end face of the first wedge ring 1 is attached to the end face of the roll collar 9, and the flat end face of the second wedge ring 2 is attached to the end face of the mechanical nut 3. The mutually engaged first wedge ring 1 and second wedge ring 2 constitute a pressure locking mechanism, and the pressure locking mechanism is entirely sleeved outside the thrust spacer ring 5.

[0021] The hydraulic nut 7 for mounting includes a hydraulic nut outer ring 71 and a hydraulic nut inner ring 72, which are connected in an axially slidable manner. A hydraulic chamber is arranged between the hydraulic nut outer ring 71 and the hydraulic nut inner ring 72, the hydraulic nut outer ring 71 is provided with an oil hole 73, and the oil hole 73 communicates the outside with the hydraulic chamber, and is used for injecting oil into the hydraulic chamber through an external hydraulic pump to increase the pressure in the chamber, so as to push the hydraulic nut inner ring 72 to move toward the roll collar 9. A plurality of support rings and pressure-resistant sealing rings are arranged between the side walls between the hydraulic nut outer ring 71 and the hydraulic nut inner ring 72, so as to ensure the sealing effect of the hydraulic chamber, and the support rings are made of polytetrafluoroethylene. In the hydraulic chamber, a circle of flow guide groove 74 is arranged on the inner wall surface of the hydraulic nut outer ring 71, the flow guide groove 74 extends circumferentially in an annular shape with a depth of about 1mm, so that when the hydraulic nut inner ring 72 is at the position closest to the hydraulic nut outer ring 71, the hydraulic chamber still retains a certain volume, and the inclination of the thrust spacer ring 5 caused by uneven oil injection at the beginning of pressurization is avoided.

[0022] The mechanical nut 3 is provided with a plurality of thrust holes uniformly distributed in the circumferential direction, the thrust holes extend in the axial direction and penetrate through both ends of the mechanical nut 3. The number of the thrust columns 6 corresponds to the thrust holes, each thrust hole is provided with a thrust column 6, one end of the thrust column 6 abuts against the thrust spacer ring 5, and the other end abuts against the hydraulic nut inner ring 72. When the hydraulic nut 7 for mounting is pressurized, the thrust column 6 transmits the axial hydraulic thrust provided by the hydraulic nut 7 for mounting to the thrust spacer ring 5, and the thrust spacer ring 5 further transmits the thrust to the roll collar 9, so as to compress the roll collar 9. A clearance fit exists between the thrust column 6 and the wall of the thrust hole, so as to avoid the friction force generated between the thrust column 6 and the wall of the thrust hole from affecting the thrust transmission. The thrust column 6 is not in contact with the second wedge ring 2.

[0023] The mechanical nut 3 has an external thread on its outer surface; the hydraulic nut outer ring 71 has an extension that surrounds the mechanical nut 3, and the inner surface of the extension has an internal thread that meshes with the external thread of the mechanical nut 3. When the hydraulic nut 7 is pressurized for installation, the threaded connection between the mechanical nut 3 and the hydraulic nut outer ring 71 fixes the hydraulic nut outer ring 71 axially, thereby allowing all hydraulic thrust to act on the roller ring 9 through the thrust column 6 and the thrust spacer 5.

[0024] On the side of the mechanical nut 3 away from the roller ring 9, there is a plug mounting hole larger than the diameter of the thrust hole at each thrust hole position. The plug mounting hole is concentric with the thrust hole, and a screw hole is provided at the bottom of the plug mounting hole. The plug 4 includes an integrally formed cap head 41 and plug body 42. After the mechanical nut 3 is sufficiently tightened, the cap head 41 is fitted into the plug mounting hole. The cap head 41 has several screw holes, and screws 43 are screwed into the bottom of the plug mounting hole through these screw holes to fix the plug 4. The plug body 42 is inserted into the thrust hole, and the plug body 42 and the thrust hole are also provided with an O-ring seal 44.

[0025] Based on the above structure, the installation method of the locking device includes the following steps: 1) Install roller ring 9 on roller shaft 8; 2) Install the thrust spacer 5, wedge ring and mechanical nut 3 in sequence, insert the thrust column 6 into the thrust hole of the mechanical nut 3, and install the hydraulic nut 7 onto the external thread of the mechanical nut 3. 3) Connect the oil hole 73 of the hydraulic nut 7 to the external hydraulic pump and start pressurizing the hydraulic nut 7. The hydraulic pressure pushes the inner ring 72 of the hydraulic nut to move towards the roller ring 9. The roller ring 9 is pressed by the thrust column 6 and the thrust spacer 5, so that the position of the pressure locking mechanism is loosened. 4) After the hydraulic nut 7 is pressed to the design pressure, rotate the first wedge ring 1 and the second wedge ring 2 relative to each other to increase the distance between them. At the same time, use a tapping rod to assist in rotating the wedge rings so that the first wedge ring 1 and the second wedge ring 2 are tightly pressed against the roller ring 9 and the mechanical nut 3 respectively. If the single stroke of the hydraulic nut 7 is not enough to reach the design pressure, the pressing and rotating steps of the wedge rings can be repeated multiple times until the expected pressure is reached. 5) A threaded hole 10 is machined at the contact point between the first wedge ring 1 and the second wedge ring 2, and a set screw is installed to fix the relative position of the first wedge ring 1 and the second wedge ring 2; 6) Depressurize and remove the hydraulic nuts 7 for installation, and remove all thrust columns 6; 7) Install the plug 4 on the mechanical nut 3.

[0026] After installation based on the above steps, the locking mechanism provides a stable and lasting locking force through the self-locking action of the wedge ring, without relying on the hydraulic nut to maintain pressure for a long time. The removed installation hydraulic nut 7 can be reused, significantly reducing manufacturing costs.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any brief modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A locking mechanism for a cemented carbide composite roller based on double wedge ring locking, wherein the composite roller comprises a roller shaft and a roller ring, characterized in that, comprising a compression locking mechanism, a mechanical nut and a thrust spacer ring, wherein the roll collar, the thrust spacer ring and the mechanical nut are sequentially sleeved on the outside of the roll shaft in parallel, and the mechanical nut is in threaded fit with the roll shaft; the compression locking mechanism is sleeved outside the thrust spacer ring and consists of a first wedge ring and a second wedge ring that are engaged with each other, the first wedge ring is attached to the end face of the roll collar, and the second wedge ring is attached to the end face of the mechanical nut; the mechanical nut is provided with a plurality of thrust holes uniformly distributed in the circumferential direction, and the thrust holes axially penetrate through the mechanical nut.

2. The cemented carbide composite roller locking mechanism based on double wedge ring locking according to claim 1, characterized in that, Each of the first wedge ring and the second wedge ring comprises a flat end face and a toothed face, the toothed face is provided with wedge teeth distributed circumferentially around, the tooth top line of each wedge tooth is parallel to the radial direction of the wedge ring, and the tooth face of the wedge tooth is a flat inclined face.

3. The carbide composite roller locking mechanism based on double wedge ring locking according to claim 2, characterized in that, The included angle θ formed between the tooth face of the wedge tooth and the plane perpendicular to the axial direction satisfies the inequality θ < arctan(μ), where μ is the friction coefficient of the wedge tooth surface.

4. The cemented carbide composite roller locking mechanism based on double wedge ring locking according to claim 1, characterized in that, The thrust spacer ring is in clearance fit with the roll shaft.

5. The carbide composite roller locking mechanism based on double wedge ring locking according to claim 1, characterized in that, It further comprises a hydraulic nut for installation and a plurality of thrust columns, wherein during the installation process of the locking mechanism, the hydraulic nut for installation is sleeved on the end of the mechanical nut away from the roll collar, and the thrust columns are arranged in the thrust holes of the mechanical nut; the hydraulic nut for installation comprises a hydraulic nut outer ring and a hydraulic nut inner ring which are connected in an axially sliding manner, a hydraulic chamber is arranged between the hydraulic nut outer ring and the hydraulic nut inner ring, and the hydraulic nut outer ring is provided with an oil hole communicating the outside with the hydraulic chamber; the hydraulic nut outer ring is axially and fixedly connected with the mechanical nut; one end of the thrust column abuts against the thrust spacer ring, and the other end abuts against the inner ring of the hydraulic nut.

6. The carbide composite roller locking mechanism based on double wedge ring locking according to claim 5, characterized in that, The side surface of the mechanical nut is provided with an external thread, the outer ring of the hydraulic nut is provided with an extension part surrounding the mechanical nut, and the inner side surface of the extension part is provided with an internal thread engaged with the external thread of the mechanical nut; the thrust column is in clearance fit with the thrust hole of the mechanical nut.

7. The carbide composite roller locking mechanism based on double wedge ring locking according to claim 5, characterized in that, In the hydraulic chamber, the inner wall surface of the outer ring of the hydraulic nut is provided with a circumferentially extending flow guide groove, and the flow guide groove is directly connected with the oil hole.

8. The cemented carbide composite roller locking mechanism based on double wedge ring locking according to claim 1, characterized in that, It further comprises a blocking cover, and the blocking cover is installed at the end of the thrust hole of the mechanical nut.

9. The carbide composite roller locking mechanism based on double wedge ring locking according to claim 8, characterized in that, The mechanical nut is provided with a blocking cover mounting hole which is coaxial with the thrust hole; the blocking cover comprises an integrally formed plug body and a cover head; after the locking mechanism is installed, the cover head of the blocking cover is fitted into the blocking cover mounting hole, and the plug body is inserted into the thrust hole.

10. The carbide composite roller locking mechanism based on double wedge ring locking according to claim 9, characterized in that, The bottom of the blocking cover mounting hole is provided with a screw hole, the cover head is provided with a plurality of screw holes, after the locking mechanism is installed, screws are screwed into the screw holes at the bottom of the blocking cover mounting hole through the screw holes of the cover head, and an O-shaped sealing ring is further arranged between the plug body and the thrust hole.

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