Hard alloy composite roller

Abstract

The utility model relates to the technical field of rollers, in particular to a hard alloy composite roller. The utility model discloses a hard alloy composite roller which comprises a roller shaft, a roller shoulder arranged at one axial end of the roller shaft and a limiting assembly arranged at the other axial end of the roller shaft and connected with the roller shaft in a threaded mode, and roller rings and distance rings which are sequentially and alternately arranged are arranged at the position, between the roller shoulder and the limiting assembly, of the roller shaft in a sleeved mode. The limiting assembly comprises a fixing ring arranged opposite to the roller shoulder in the axial direction of the roller shaft, the fixing ring comprises a binding section, an expansion section and a threaded section which are sequentially arranged in the axial direction of the roller shaft, the outer diameter of the binding section is smaller than that of the threaded section, and the outer diameter of the threaded section is 10 mm smaller than that of the expansion section. The oil injection device has the advantage that the superficial area for oil liquid in the oil injection cavity to generate pressure can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling rolls, in particular to a cemented carbide composite roll. Background Art

[0002] Chinese Patent with application number 201710801251.3 discloses a cemented carbide composite roll, which includes a roll shaft, a cemented carbide roll ring, a locking nut and a fastening nut. The cemented carbide roll ring is sleeved on the roll shaft. One end of the roll shaft is provided with a shoulder. A piston is arranged between the cemented carbide roll ring and the shoulder. An oil injection cavity is formed between the piston and the end face of the shoulder. An oil injection hole along the axial direction is opened on the shoulder, and the oil injection hole communicates with the oil injection cavity.

[0003] In the above technical solution, after the roll ring, spacer ring, locking nut and fastening nut are sequentially installed on the roll shaft, the assembly of the cemented carbide composite roll is completed. However, in the existing cemented carbide composite roll during use, due to the limitation of the scrapping conditions, there are differences in the scrapping tolerances of the piston and the locking nut (when the remaining radial thickness of the piston reaches 10 mm, it reaches the scrapping condition, and when the remaining radial thickness of the locking nut reaches 20 mm, it reaches the scrapping condition). In the actual processing of the existing locking nut, fastening nut and piston, for the convenience of processing, the inner diameter and outer diameter dimensions of the piston and the locking nut are the same. As a result, after the locking nut is used until it is scrapped, the piston can still be used, but it needs to be scrapped synchronously with the locking nut. Therefore, this size design affects the area of the oil acting surface in the oil injection cavity (in order to match the same inner and outer diameter dimensions of the piston and the locking nut, the side wall of the oil injection cavity is restricted by the scrapping tolerance parameters like the piston, causing the outer diameter of the piston to shrink inwards to the same size as the inner diameter of the locking nut during the size design). Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cemented carbide composite roll that can ensure the surface area of the oil in the oil injection cavity to generate pressure.

[0005] To achieve the above purpose, the utility model discloses a cemented carbide composite roll, which includes a roll shaft, a roll shoulder arranged at one axial end of the roll shaft, and a limiting component arranged at the other axial end of the roll shaft and threadedly connected to the roll shaft. The roll shaft is sleeved with alternately arranged roll rings and spacer rings between the roll shoulder and the limiting component. The limiting component includes a fixed ring arranged axially opposite to the roll shoulder along the roll shaft. The fixed ring includes a converging section, a diverging section and a threaded section arranged in sequence along the axial direction of the roll shaft. The outer diameter of the converging section is smaller than the outer diameter of the threaded section, and the outer diameter of the threaded section is 10 mm smaller than the outer diameter of the diverging section.

[0006] When the roll ring needs to be fixed, the roll ring and the spacer ring are alternately sleeved on the outer cylindrical surface of the roll shaft in sequence, and the roll ring is clamped in a manner that the roll ring cooperates with the shaft shoulder through the spacer ring, the spacer ring with the spacer ring, and the limiting component with the spacer ring. After the sleeving is completed, the contact area between the spacer ring and the roll ring is the surface area of the side of the roll ring close to the spacer ring. Under the action of oil pressure, the limiting component uses the reaction force of the fixing ring to fix the roll ring by the cooperating spacer ring and shaft shoulder, and the end face of the fixing ring along the axial direction of the roll shaft is the hydraulic surface.

[0007] In the present utility model, the dimensions of the expansion section and the threaded section of the fixing ring are designed according to the 10 mm difference required by the scrap tolerance, so that the fixing ring can continue to be used in cooperation with the limiting component through the constriction section, the expansion section, and the threaded section arranged in sequence along the axial direction of the roll shaft, and the area of the oil-acting surface of the fixing ring is ensured, thereby ensuring the hydraulic effect of the fixing ring.

[0008] Preferably, the limiting component further includes an oil inlet channel arranged in the fixing ring, a locking nut threadedly engaged with the fixing ring, and a thrust ring sleeved on the outer cylindrical surface of the fixing ring and capable of moving along the axial direction of the roll shaft. The thrust ring cooperates with the constriction section and the expansion section of the fixing ring, and the locking nut cooperates with the threaded section.

[0009] During pressure application, the oil fluid enters the space between the fixing ring and the thrust ring through the oil inlet channel, that is, between the end face of the fixing ring along the axial direction of the roll shaft and the end face along the axial direction of the part of the thrust ring close to the roll shaft. When the pressure application is completed, the position of the locking nut on the threaded section of the fixing ring is adjusted, so as to provide a force for the thrust ring after pressure relief.

[0010] Preferably, the thrust ring includes a small-diameter section for cooperating with the constriction section of the fixing ring and a large-diameter section for cooperating with the expansion section of the fixing ring. A hydraulic cavity with an opening facing the expansion section of the fixing ring is formed on the side wall of the small-diameter section of the thrust ring along the axial direction of the roll shaft, and the oil outlet of the oil inlet channel faces the hydraulic cavity.

[0011] During pressure application, the hydraulic cavity with an opening facing the expansion section of the fixing ring arranged in the small-diameter section of the thrust ring facilitates the oil fluid to enter the hydraulic cavity, ensuring the contact area between the oil fluid and the end of the piston during pressure application. Among them, the hydraulic cavity can be set as any existing gap space between two planes.

[0012] Preferably, the axial cross-section of the hydraulic cavity along the roll shaft is arc-shaped.

[0013] By setting the inner wall of the hydraulic cavity as an arc-shaped inner wall, the contact area between the oil fluid and the thrust ring is increased, ensuring the force-bearing area of the thrust ring, and thus ensuring the hydraulic effect.

[0014] Preferably, the oil outlet of the oil inlet channel faces the arc top of the hydraulic cavity.

[0015] Compared with the way that the oil outlet of the oil inlet passage faces the arc edge, it can avoid the situation that the oil hits the arc edge and starts to apply pressure, resulting in the tilting and jamming of the pressing surface.

[0016] Preferably, a seal is provided between the axial inner wall of the thrust ring and the axial outer walls of the converging section and the diverging section of the fixed ring.

[0017] The seal is any existing seal workpiece used to ensure the sealing performance of the hydraulic chamber between the thrust ring and the fixed ring, such as a sealing ring or an O-ring.

[0018] Preferably, two sets of annular grooves for embedding the seal are provided between the axial outer walls of the converging section and the diverging section of the fixed ring and the axial inner wall of the thrust ring.

[0019] The seal provided between the converging section of the fixed ring and the axial inner wall of the thrust ring is used to ensure the sealing performance of the hydraulic chamber, and the seal provided between the diverging section of the fixed ring and the axial inner wall of the thrust ring is used to prevent water from entering through the roll gap.

[0020] The utility model can avoid the influence of the existing design of the sizes of the thrust ring and the fixed ring on the area of the oil acting surface in the oil injection chamber, and has the advantage of ensuring the surface area for the oil in the oil injection chamber to generate pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of the utility model.

[0022] Figure 2 is Figure 1 the enlarged view at A in

[0023] In the figure: 11, roll shaft; 12, roll ring; 13, spacer ring; 14, fixed ring; 141, converging section; 142, diverging section; 143, threaded section; 15, oil inlet passage; 16, sealing ring; 20, thrust ring; 201, small diameter section; 202, large diameter section; 21, hydraulic chamber; 211, arc top; 22, lock nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the utility model with reference to the drawings and specific embodiments.

[0025] As Figure 1 shown, it includes a roll shaft 11, a roll shoulder provided at one axial end of the roll shaft 11, and a limiting assembly provided at the other axial end of the roll shaft 11 and threadedly connected to the roll shaft 11. A roll ring 12 and a spacer ring 13 are alternately sleeved on the roll shaft 11 between the roll shoulder and the limiting assembly. As Figure 2As shown in the figure, the limit component includes a fixed ring 14 axially arranged on the opposite side of the roll shoulder along the axial direction of the roll shaft 11, an oil inlet channel 15 arranged inside the fixed ring 14, a locking nut 22 threadedly engaged with the fixed ring 14, and a thrust ring 20 sleeved on the outer circumferential surface of the fixed ring and capable of moving axially along the roll shaft. The thrust ring 20 cooperates with the constricted section and the expanded section of the fixed ring 14. The fixed ring 14 includes a constricted section 141, an expanded section 142, and a threaded section 143 arranged in sequence along the axial direction of the roll shaft. The locking nut 22 is engaged with the threaded section 143 of the fixed ring 14. The thrust ring 20 includes a small-diameter section 201 for cooperating with the constricted section 141 of the fixed ring 14 and a large-diameter section 202 for cooperating with the expanded section 142 of the fixed ring 14. A hydraulic chamber 21 with an opening facing the expanded section 142 of the fixed ring 14 is provided on the side wall of the small-diameter section 201 of the thrust ring 20 along the axial direction of the roll shaft. The cross-section of the hydraulic chamber 21 along the axial direction of the roll shaft 11 is arc-shaped, and the oil outlet of the oil inlet channel 15 is opposite to the arc top 211 of the hydraulic chamber 21.

[0026] When it is necessary to install the limit component first, the thrust ring 20 is sleeved on the fixed ring 14, so that the small-diameter section 201 of the thrust ring 20 cooperates with the constricted section 141 of the fixed ring 14, and the large-diameter section 202 of the thrust ring 20 cooperates with the expanded section 142 of the fixed ring 14. Then, the locking nut 22 is installed on the threaded section 143 of the fixed ring 14 through threads, and the installation of the limit component is completed.

[0027] The outer diameter of the constricted section 141 of the fixed ring 14 is smaller than the outer diameter of the threaded section 143 of the fixed ring 14. The outer diameter of the threaded section 143 of the fixed ring 14 is 10 mm smaller than the outer diameter of the expanded section 142 of the fixed ring 14. Furthermore, the dimensions of the fixed ring 14 are used to make up for the dimensions of the thrust ring 20 and the locking nut 22 restricted by the scrap tolerance parameters. This not only avoids the influence of the existing design of the dimensions of the thrust ring 20 and the fixed ring 14 on the area of the oil-acting surface of the fixed ring 14, but also enables the thrust ring 20 and the locking nut 22 to reach the scrap dimensions simultaneously after grinding in combination with the roll ring 12 and the spacer ring 13.

[0028] From Figure 2 As shown in the figure, two sets of annular grooves for inlaying seals are provided between the axial outer walls of the constricted section 141 and the expanded section 142 of the fixed ring 14 and the axial inner walls of the thrust ring 20. Seals are provided in the annular grooves. The seals are seal rings 16. The seal ring 16 provided between the constricted section 141 of the fixed ring 14 and the axial inner wall of the thrust ring 20 is used to ensure the sealing performance of the hydraulic chamber 21. The seal ring 16 provided between the expanded section 142 of the fixed ring 14 and the axial inner wall of the thrust ring 20 is used to prevent water from entering through the roll gap.

[0029] When it is necessary to fix the roll ring 12, the roll ring 12 and the spacer ring 13 are alternately sleeved on the outer cylindrical surface of the roll shaft 11 in sequence, and the roll ring 12 is clamped in a manner that the roll ring 12 is cooperated with the shaft shoulder through the spacer ring 13 and the spacer ring 13 is cooperated with the spacer ring 13. After the sleeving is completed, the limiting assembly is installed on the other end of the roll shaft 11, and the hydraulic pressure is applied to the hydraulic cavity 21 through the oil inlet channel 15. The thrust ring 20 moves in a direction away from the locking nut 22 under the action of the hydraulic pressure, thereby pushing the spacer ring 13 to clamp the roll ring 12, and the fixing of the roll ring 12 is completed.

Claims

1. A cemented carbide composite roll, comprising a roll shaft, a roll shoulder provided at one axial end of the roll shaft, and a limiting component provided at the other axial end of the roll shaft and threadedly connected to the roll shaft. A roll ring and a spacer ring are alternately sleeved in sequence at a position of the roll shaft between the roll shoulder and the limiting component. The limiting component includes a fixing ring axially arranged on the roll shaft opposite to the roll shoulder, and is characterized in that: The fixed ring includes a converging section, a diverging section, and a threaded section that are sequentially arranged along the axial direction of the roller shaft. The outer diameter of the converging section is smaller than that of the threaded section, and the outer diameter of the threaded section is 10 mm smaller than that of the diverging section.

2. The cemented carbide composite roll according to claim 1, wherein: The limiting component further includes an oil inlet channel disposed within the fixed ring, a locking nut threadedly engaged with the fixed ring, and a thrust ring sleeved on the outer circumferential surface of the fixed ring and capable of moving axially along the roller shaft. The thrust ring cooperates with the converging section and the diverging section of the fixed ring, and the locking nut cooperates with the threaded section.

3. A cemented carbide composite roll according to claim 2, characterized in that: The thrust ring includes a small-diameter section for cooperating with the converging section of the fixed ring and a large-diameter section for cooperating with the diverging section of the fixed ring. A hydraulic cavity with an opening facing the diverging section of the fixed ring is formed in the side wall of the small-diameter section of the thrust ring along the axial direction of the roller shaft, and the oil outlet of the oil inlet channel faces the hydraulic cavity.

4. A cemented carbide composite roll according to claim 3, wherein: The cross-section of the hydraulic cavity along the axial direction of the roller shaft is arc-shaped.

5. A cemented carbide composite roll according to claim 4, wherein: The oil outlet of the oil inlet channel faces the arc top of the hydraulic cavity.

6. A cemented carbide composite roll according to any one of claims 2-5, characterized in that: Sealing members are provided between the axial inner wall of the thrust ring and the axial outer walls of the converging section and the diverging section of the fixed ring.

7. A cemented carbide composite roll according to claim 6, characterized in that: Two sets of annular grooves for embedding the sealing members are provided between the axial outer walls of the converging section and the diverging section of the fixed ring and the axial inner wall of the thrust ring.

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