A cemented carbide combined roller locking device

Abstract

The invention discloses a cemented carbide combined rolling roller locking device, comprising a roller shaft and a roller ring sleeved on the outer side thereof, the number of the roller ring is at least one, and spacer rings are arranged on adjacent two sides of the roller ring, the linear expansion coefficient of the roller shaft is A, the expansion coefficient of the roller ring is B, the roller shaft expansion coefficient A is greater than the expansion coefficient B of the roller ring, the roller shaft and the roller ring are fitted by thermal expansion interference, a retaining ring for blocking the roller ring is arranged at one end of the roller shaft, and a locking nut is arranged at the other end of the roller shaft, the locking nut is in tight pressure contact with the rightmost end face of the roller ring, and the roller shaft and the locking nut are threadedly connected. The invention is designed to address the drawbacks of the existing device and to reduce the number of locking mechanism components as much as possible. In addition to all the advantages of the hydraulic nut and the mechanical clamping combination, this locking method also has the advantages of fewer components, convenient processing, and lower processing cost. The assembly adopts a small clearance fit, which is easy to disassemble and has strong practicality.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical assembly, in particular to a hard alloy combined roller locking device. Background Art

[0002] The quality of the roll, one of the important parts of the rolling mill, directly affects the output, product quality and roll consumption cost of the steel mill. At present, the rolls used by bar manufacturers are still mainly cast iron rolls, which have poor wear resistance and short service life of the rolling groove, seriously affecting the dimensional accuracy of the product and not conducive to improving the operation rate of the rolling mill. In recent years, cemented carbide composite rolls that overcome the defects of cast iron rolls have been rapidly promoted and applied. Cemented carbide composite rolls have the characteristics of simple and practical structure, easy maintenance, safe and reliable operation, and have obvious technical and economic advantages. They can increase product output, reduce comprehensive costs, and enhance product competitiveness.

[0003] The carbide composite roll is precisely assembled from forged steel roll shafts, carbide roll rings, spacer rings, locking mechanisms and other components. From the working principle analysis of the carbide composite roll, it can be seen that the roll must ensure three points during use: a. The roll ring maintains a sufficiently large axial locking force; b. Avoid the roll ring from rotating; c. Avoid the roll ring from axial movement. According to this design idea and combined with actual production conditions, we have developed and designed a variety of assembly methods, the most commonly used of which are hydraulic nut axial locking and mechanical clamping combination. The hydraulic nut has the characteristics of safe and reliable locking.

[0004] The two assembly methods currently in use have disadvantages: hydraulic nuts have the disadvantages of a large number of processing components, high matching accuracy requirements, strict requirements on processing equipment, special tools are required for maintenance and roller replacement, and they are not easy to disassemble, and the processing cost is high. The hydraulic disassembly is very complicated and even needs to be returned to the manufacturer for disassembly through fixed equipment. Although the processing cost of mechanical clamping is slightly reduced, it still has the disadvantages of a large number of processing components (26 pieces for a single component) and high positioning accuracy requirements.

[0005] In view of the above problems, a cemented carbide combined roller locking device is now provided. Summary of the invention

[0006] The object of the present invention is to provide a cemented carbide composite roller locking device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A cemented carbide combined roll locking device, comprising a roll shaft and a roll ring sleeved on the outside thereof, the number of the roll ring being at least one, spacer rings being arranged on adjacent two sides of the roll ring, the linear expansion coefficient of the roll shaft being A, the expansion coefficient of the roll ring being B, the expansion coefficient A of the roll shaft being greater than the expansion coefficient B of the roll ring, the roll shaft and the roll ring being fitted by thermal expansion interference, a retaining ring for blocking the roll ring being arranged at one end of the roll shaft, a locking nut being arranged at the other end of the roll shaft, the locking nut being in tight pressure contact with the end face of the rightmost roll ring, and the roll shaft and the locking nut being threadedly connected;

[0009] It includes a transition plate for supporting one end of the roller shaft close to the retaining ring, the transition plate is provided with a through hole matched with the end of the roller shaft, the outer side of the fixing plate is connected and fixed to the bottom of the square clamp, the square clamp is a frame structure with a rectangular ring cross-section, the outer side of the square clamp is connected and fixed to the fixing bracket, and the outer side of the square clamp is also provided with at least eight telescopic extrusion rods, the eight telescopic extrusion rods are distributed on the four sides of the square clamp, and the output end of each telescopic extrusion rod is provided with a clamping head for positioning the roller ring;

[0010] The utility model comprises a sleeve which cooperates with the outer side of the locking nut so as to be operated by a hydraulic wrench. The sleeve design can avoid damage to the nut during the operation of the hydraulic wrench, thereby increasing the service life of the nut.

[0011] As a further solution of the present invention: the clamping surface of the clamping head is provided with an anti-slip layer.

[0012] As a further solution of the present invention: the anti-slip layer is made of rubber material.

[0013] As a further solution of the present invention: a conical guide port is provided at the lower end of the sleeve.

[0014] As a further solution of the present invention: the expansion coefficient of the spacer ring is equal to the expansion coefficient of the roller shaft.

[0015] As a further solution of the present invention: the locking nut is a twelve-square locking nut.

[0016] An operating method of a cemented carbide combined roll locking device comprises the following steps:

[0017] Step 1: Heat the spacer ring and assemble it with the roller shaft so that the roller shaft and the spacer ring are integrated with each other through interference fit. Then, insert one end of the roller shaft with the retaining ring on the transition plate for preliminary positioning.

[0018] Step 2: Put the roller ring and the spacer ring on the roller shaft in sequence;

[0019] Step 3: Use a square clamp to apply extrusion force to the surface of the roller ring and the spacer ring, so as to position the entire roller shaft and accessories;

[0020] Step 4: Install the locking nut on the threaded area at the upper end of the roller shaft, then rotate it to achieve preliminary locking, then put the sleeve on the locking nut, and finally operate the locking nut with a hydraulic wrench to achieve final locking.

[0021] Compared with the prior art, the invention has the following beneficial effects: the invention is designed to address the drawbacks of the prior art and to reduce the number of locking mechanism components as much as possible. In addition to all the advantages of the hydraulic nut and mechanical clamping combination, this locking method also has the advantages of fewer components, convenient processing, and lower processing costs. The assembly adopts a small clearance fit, which is easy to disassemble and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention.

[0023] Figure 2 It is the front view of the assembly frame platform of the present invention.

[0024] Figure 3 This is the main cross-sectional view of the roll assembly of the present invention.

[0025] Figure 4 This is a top view of the roller assembly of the present invention.

[0026] Among them: a fixed bracket 1, a clamping head 2, a telescopic extrusion rod 3, a transition plate 4, a roller shaft 5, a retaining ring 51, a square clamp 6, a sleeve 7, a roller ring 8, a spacer ring 9, a locking nut 10, and a hydraulic wrench 11. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-4In an embodiment of the present invention, a cemented carbide combined roll locking device comprises a roll shaft 5 and a roll ring 8 sleeved on the outside thereof, the number of the roll ring 8 is at least one, and spacer rings 9 are arranged on adjacent two sides of the roll ring 8, the linear expansion coefficient of the roll shaft 5 is A, the expansion coefficient of the roll ring 8 is B, the expansion coefficient A of the roll shaft 5 is greater than the expansion coefficient B of the roll ring 8, the roll shaft 5 and the roll ring 8 are initially fitted with a small gap, and gradually become an interference fit through thermal expansion after work, a retaining ring 51 for blocking the roll ring 8 is arranged at one end of the roll shaft 5, and a locking nut 10 is arranged at the other end of the roll shaft 5, the locking nut 10 is a twelve-square locking nut, the locking nut 10 is in tight contact with the end face of the rightmost roll ring 8, and the roll shaft 5 and the locking nut 10 are threadedly connected;

[0029] It includes a transition plate 4 for supporting one end of the roller shaft 5 close to the retaining ring, the transition plate 4 is provided with a through hole matched with the end of the roller shaft 5, the outer side of the fixing plate is connected and fixed to the bottom of the square clamp 6, the square clamp 6 is a frame structure with a rectangular ring cross-section, the outer side of the square clamp 6 is connected and fixed to the fixing bracket 1, and the outer side of the square clamp 6 is also provided with at least eight telescopic extrusion rods 3, the eight telescopic extrusion rods 3 are distributed on the four sides of the square clamp 6, and the output end of each telescopic extrusion rod 3 is provided with a clamping head 2 for positioning the roller ring 8, and the clamping surface of the clamping head 2 is provided with an anti-slip layer, and the anti-slip layer is made of rubber material, so that the clamping area can also be increased during the clamping process;

[0030] It includes a sleeve 7 that cooperates with the outer side of the locking nut 10 to facilitate the operation of the hydraulic wrench 11. The design of the sleeve 7 can avoid damage to the nut during the operation of the hydraulic wrench 11, thereby increasing the service life of the nut;

[0031] In actual use, when at room temperature, there is a clearance fit between the roller ring 8 and the roller shaft 5, which makes it easy to disassemble and assemble the device. When the temperature rises after operation, since the expansion coefficient B of the roller ring 8 is smaller than the expansion coefficient A of the roller shaft 5, the expansion amplitude of the roller shaft 5 (A) is greater than the expansion amplitude of the roller ring 8, so that an interference fit is achieved between the roller ring 8 and the roller shaft 5;

[0032] The actual locking method is as follows: Step 1: After heating the spacer ring and interferingly assembling it with the roller shaft, first insert one end of the roller shaft 5 provided with the retaining ring 51 onto the transition plate 4 for preliminary positioning;

[0033] Step 2: At room temperature, the roller ring 8 and the spacer ring 9 are sequentially mounted on the roller shaft 5;

[0034] Step 3: Use the square clamp 6 to apply extrusion force to the surface of the roller ring 8 and the spacer ring 9, so as to position the outer side of the entire roller shaft 5;

[0035] Step 4: Install the locking nut 10 on the threaded area at the upper end of the roller shaft 5, then rotate it to achieve preliminary positioning, then put the sleeve 7 on the locking nut 10, and finally operate the locking nut 10 with the hydraulic wrench 11 to achieve final positioning.

[0036] The working principle of the present invention is: under the premise of ensuring the three-point use requirements of the cemented carbide combination roller, we adopt the subtraction thinking to reduce the number of locking mechanism components as much as possible, and it has evolved into the current single-piece locking method of twelve-square large nuts. In addition to all the advantages of the hydraulic nut axial locking and mechanical clamping combination, this locking method also has the advantages of fewer components, convenient processing, and lower processing cost. The assembly adopts a small clearance fit, which is easy to disassemble. The roller ring and the roller shaft are designed to be tightly sliding fit. At room temperature, there is a certain amount of clearance between the roller ring and the roller shaft. After the rolling temperature is uniformly increased, the different linear expansion coefficients of the two reduce the clearance, so that the roller ring and the roller shaft become a transition fit or interference fit. This also provides convenience for the users who need to disassemble and assemble independently, and the reuse of the roller shaft and the nut is convenient.

[0037] 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.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A cemented carbide combined roller locking device, characterized in that: The invention comprises a roller shaft (5) and a roller ring (8) sleeved on the outer side thereof, wherein the number of the roller ring (8) is at least one, and spacer rings (9) are provided on adjacent two sides of the roller ring (8), the expansion coefficient of the roller shaft (5) is A, the expansion coefficient of the roller ring (8) is B, the expansion coefficient A of the roller shaft (5) is greater than the expansion coefficient B of the roller ring (8), and the roller shaft (5) and the roller ring (8) are fitted by thermal expansion interference. A retaining ring (51) for retaining the roller ring (8) is provided at one end of the roller shaft (5), and a twelve-square locking nut (10) is provided at the other end of the roller shaft (5). The twelve-square locking nut (10) is in tight contact with the end surface of the roller ring (8) on the far right, and the roller shaft (5) and the twelve-square locking nut (10) are threadedly connected; When at room temperature, there is a clearance fit between the roller ring (8) and the roller shaft (5). When the temperature rises after operation, since the expansion coefficient B of the roller ring (8) is smaller than the expansion coefficient A of the roller shaft (5), the expansion amplitude of the roller shaft (5) is greater than the expansion amplitude of the roller ring (8); The invention comprises a transition plate (4) for supporting one end of the roller shaft (5) close to the retaining ring (51), the transition plate (4) being provided with a through hole matched with the end of the roller shaft (5), the outer side of the transition plate (4) being connected and fixed to the bottom of a square clamp (6), the square clamp (6) being a frame structure with a rectangular ring cross section, the outer side of the square clamp (6) being connected and fixed to a fixed bracket (1), the outer side of the square clamp (6) being provided with at least eight telescopic extrusion rods (3), the eight telescopic extrusion rods (3) being distributed on four sides of the square clamp (6), the output end of each telescopic extrusion rod (3) being provided with a clamping head (2) for positioning the roller ring (8), the clamping surface of the clamping head (2) being provided with an anti-slip layer, the anti-slip layer being made of rubber material, so that the clamping area can be increased during the clamping process; It comprises a sleeve (7) which cooperates with the outer side of a twelve-square locking nut (10) to facilitate operation by a hydraulic wrench (11); a conical guide port is provided at the lower end of the sleeve (7).

2. The cemented carbide composite roller locking device according to claim 1, characterized in that: The clamping surface of the clamping head (2) is provided with an anti-slip layer.

3. The cemented carbide composite roller locking device according to claim 2, characterized in that: The anti-slip layer is made of rubber material.

4. The cemented carbide composite roller locking device according to claim 1, characterized in that: The expansion coefficient of the spacer ring (9) is equal to the expansion coefficient of the roller shaft.

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