Hard alloy combined roller

Abstract

A hard alloy combined roller comprises a mandrel and a positioning ring fixed to one end of a mandrel body, the mandrel body is sleeved with roller rings, the roller rings comprise hard alloy roller rings and baffle rings which are arranged at intervals in the axial direction of the mandrel, and the baffle rings and the mandrel are connected through shaft keys limiting relative rotation of the baffle rings and the mandrel. A hydraulic locking piece is arranged at the other end of the mandrel body, the hydraulic locking piece and the positioning ring extrude the hard alloy roll rings and the baffle rings located between the hydraulic locking piece and the positioning ring, and the end faces of the adjacent hard alloy roll rings and the baffle rings abut against each other. According to the hard alloy combined roller, through the combination mode, on one hand, abrasion resistance is kept, on the other hand, installation difficulty and cost are reduced, and meanwhile connection is more stable.

Description

Technical Field

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

[0002] With the increasingly fierce market competition in the quality and price of steel products, on the one hand, steel enterprises are constantly updating their own equipment technologies to improve the rolling speed of rolling mills; at the same time, how to reduce the number of shutdowns of rolling mills and further improve the effective operation rate of rolling mills has become an important issue concerned by rolling mill engineers. And using roll materials with higher rolling life is one of the important means to achieve this goal. By installing cemented carbide roll rings on the outer side of a steel core shaft to form a cemented carbide roll, it can replace traditional high-nickel rolls and high-speed steel rolls, and has the advantages of good wear resistance and high steel passing capacity per single groove, which is the technical development direction of bar and wire rod rolling in the steel industry.

[0003] However, the processing difficulty and cost of cemented carbide roll rings are relatively high, and there is also a tendency of relative rotation between the cemented carbide roll rings and the steel core shaft after installation. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cemented carbide composite roll, which, through a combined method, on the one hand, maintains wear resistance, on the other hand, reduces the installation difficulty and cost, and at the same time has a more stable connection.

[0005] The technical solution adopted by the utility model is: a cemented carbide composite roll, including a core shaft and a positioning ring fixed at one end of the shaft body of the core shaft. A roll ring is sleeved on the shaft body of the core shaft. The roll ring includes cemented carbide roll rings and spacer rings arranged at intervals along the axial direction of the core shaft. Among them, the spacer ring and the core shaft are connected by a shaft key that restricts the relative rotation between the two;

[0006] The other end of the shaft body of the core shaft is provided with a hydraulic locking member. The hydraulic locking member and the positioning ring squeeze the cemented carbide roll rings and spacer rings between them, and make the end faces of adjacent cemented carbide roll rings and spacer rings abut against each other.

[0007] As a preferred solution, the cemented carbide roll ring is in interference fit with the shaft body of the core shaft.

[0008] As a preferred solution, the spacer ring includes a separating ring located between adjacent cemented carbide roll rings and a retaining ring that fits with the positioning ring;

[0009] A positioning ring groove that matches the positioning ring is provided on the end face of the retaining ring.

[0010] As a preferred solution, the hydraulic locking member includes a connecting ring threadedly connected to the outside of the core shaft, a fastening ring threadedly connected to the outside of the connecting ring, and a hydraulic cylinder located between the connecting ring and the roll ring and capable of generating a thrust along the axial direction of the core shaft.

[0011] As a preferred solution, the thrust of the hydraulic cylinder can act on the mandrel via the connecting ring, causing the mandrel to undergo axial tensile elastic deformation, and the fastening ring can be tightened towards the hydraulic cylinder after the mandrel is stretched and deformed to fill the gap between the two.

[0012] As a preferred solution, the hydraulic cylinder includes an annular body and a piston;

[0013] An annular groove for accommodating the piston is provided on the end face of the annular body facing the connecting ring. A hydraulic cavity is provided inside the annular body, and the inner end of the hydraulic cavity extends to communicate with the annular groove. One end face of the piston presses on the end face of the connecting ring, and the other end face of the piston faces the hydraulic cavity and communicates with the inner port of the annular groove.

[0014] As a preferred solution, two sealing rings are provided between the piston and the inner wall of the annular groove, and the inner port of the hydraulic cavity is located within the annular gap formed by the two sealing rings.

[0015] As a preferred solution, the inner ring edge of the piston extends axially along the mandrel into the gap between the inner ring surface of the annular body and the mandrel.

[0016] As a preferred solution, the mandrel is a steel mandrel.

[0017] As a preferred solution, the spacer ring is a steel roller ring.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. By adopting the method of arranging cemented carbide roller rings and spacer rings at intervals, the cost is low, and it has the characteristics of good wear resistance of cemented carbide. At the same time, the axial thickness of a single cemented carbide roller ring is small, and the processing difficulty is low;

[0020] 2. The spacer ring and the mandrel are connected by a shaft key. Under the extrusion action, the cemented carbide roller ring keeps in sync with the spacer ring, and the two cannot rotate circumferentially relative to the mandrel, and the connection is more stable;

[0021] 3. Compared with the cemented carbide roller ring, the spacer ring and the mandrel have a lower hardness and are easier to process;

[0022] The spacer ring with an appropriate axial thickness is processed as needed. After being combined with the cemented carbide roller ring, the overall length of the roller ring reaches the expected length axially;

[0023] It is not necessary to process the cemented carbide roller ring, and it also has a circumferential fixing effect on the mandrel;

[0024] 4. The cemented carbide roller ring is interference-fitted with the mandrel by heat treatment to inhibit the circumferential rotation between the cemented carbide roller ring and the mandrel;

[0025] 5. The hydraulic locking part utilizes the property of the elastic deformation of the mandrel in the axial direction to firmly press and fix the cemented carbide roll ring, spacer ring and retaining ring on the mandrel, further restricting the circumferential rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic axial cross-section view of the present invention;

[0028] Figure 2 It is a schematic view of the hydraulic cylinder of the present invention.

[0029] Reference numerals: 1, mandrel; 101, positioning ring; 2, cemented carbide roll ring; 3, spacer retaining ring; 301, spacer ring; 302, retaining ring; 303, positioning ring groove; 4, shaft key; 5, connecting ring; 6, fastening ring; 7, hydraulic cylinder; 701, annular body; 702, piston; 703, annular groove; 704, hydraulic cavity; 8, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the present invention will be specifically described by way of exemplary embodiments. However, it should be understood that, without further elaboration, the elements, structures and features in one embodiment can also be beneficially combined with those in other embodiments.

[0031] It should be noted that: unless otherwise defined, the technical terms or scientific terms used herein should have the ordinary meaning understood by those of ordinary skill in the art to which the present invention pertains. The words such as "a", "an" or "the" used in the description and claims of the patent application of the present invention do not express a limitation of quantity, but rather indicate the existence of at least one; the "first", "second" and "third" used herein should not be regarded as a limitation on the order of components, but are only used to distinguish different components; the words such as "comprising" or "including" indicate that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0032] In order to more clearly describe the specific structural composition of the cemented carbide composite roll, in combination with the attached Figure 1-2 Describe this embodiment:

[0033] AsFigure 1 As shown in the figure, a cemented carbide composite roll includes a mandrel 1 and a positioning ring 101 fixed at one end of the shaft body of the mandrel 1. A roll ring is sleeved on the shaft body of the mandrel 1. The roll ring includes cemented carbide roll rings 2 and spacer rings 3 arranged at intervals along the axial direction of the mandrel 1. By the way of arranging the cemented carbide roll rings 2 and the spacer rings 3 at intervals, the cost is low, and it has the characteristics of good wear resistance of cemented carbide. At the same time, the axial thickness of a single cemented carbide roll ring 2 is small, and the processing difficulty is low.

[0034] Among them, the spacer ring 3 and the mandrel 1 are connected by a shaft key 4 that restricts the relative rotation of the two. A hydraulic locking member is provided at the other end of the shaft body of the mandrel 1. The hydraulic locking member presses the cemented carbide roll rings 2 and the spacer rings 3 between them and the positioning ring 101, and makes the end faces of adjacent cemented carbide roll rings 2 and spacer rings 3 abut against each other. The spacer ring 3 and the mandrel 1 are connected by a shaft key. Under the extrusion action, the cemented carbide roll ring 2 keeps in sync with the spacer ring 3, and the two cannot rotate circumferentially relative to the mandrel 1, and the connection is more stable.

[0035] Exemplarily, the shaft key 4 can be a flat key. Key grooves are processed on the circumferential surface of the mandrel 1 and the inner ring surface of the spacer ring 3, and the relative rotation of the spacer ring 3 and the mandrel 1 is restricted by the cooperation of the key grooves and the shaft key.

[0036] The mandrel 1 and the spacer ring 3 can be made of steel materials. The spacer ring 3 and the mandrel 1 are lower in hardness than the cemented carbide roll ring 2 and are easy to process; according to needs, the spacer ring 3 with an appropriate axial thickness is processed, and after being combined with the cemented carbide roll ring 2, the overall roll ring reaches the expected length in the axial direction; there is no need to process the cemented carbide roll ring 2, and it also has the function of circumferentially fixing it to the mandrel 1.

[0037] The cemented carbide roll ring 2 is in interference fit with the shaft body of the mandrel 1. The cemented carbide roll ring 2 is in interference fit with the mandrel by heat treatment to inhibit the circumferential rotation between the cemented carbide roll ring 2 and the mandrel 1.

[0038] In the above embodiment, the spacer ring 3 includes a spacer ring 301 located between adjacent cemented carbide roll rings 2 and a retaining ring 302 that fits with the positioning ring 101; a positioning ring groove 303 that cooperates with the positioning ring 101 is provided on the end face of the retaining ring 302. The positioning ring 101 is more stable in the positioning ring groove 303, and at the same time makes the joint surface of the two flat. The positioning ring 101 can be directly processed on the mandrel 1 to play a positioning role. The radial thickness of the positioning ring 101 is less than the radial thickness of the retaining ring 302, reducing the diameter of the bar used for processing the mandrel 1. The outer ring surface of the retaining ring 302 can be made flush with the outer ring surface of the cemented carbide roll ring 2, and the retaining ring 302 and the positioning ring 101 cooperate to play a stopping effect.

[0039] The hydraulic locking member utilizes the property of the elastic deformation of the mandrel in the axial direction to firmly press and fix the cemented carbide roll ring, spacer ring and retaining ring on the mandrel, further restricting the circumferential rotation. The hydraulic locking member includes a connecting ring 5 threadedly connected to the outside of the mandrel 1, a fastening ring 6 threadedly connected to the outside of the connecting ring 5, and a hydraulic cylinder 7 disposed between the connecting ring 5 and the roll ring and capable of generating a thrust along the axial direction of the mandrel 1. Specifically, mating threads are respectively provided on the circumferential surface of the mandrel 1 and the inner ring surface of the connecting ring 5, and mating threads are respectively provided on the outer ring surface of the connecting ring 5 and the inner ring surface of the fastening ring 6.

[0040] The thrust of the hydraulic cylinder 7 can act on the mandrel 1 via the connecting ring 5, causing the mandrel 1 to undergo axial tensile elastic deformation. The fastening ring 6 can be tightened towards the hydraulic cylinder 7 after the mandrel 1 is stretched and deformed to fill the gap between the two.

[0041] Refer to Figure 2 , specifically, the hydraulic cylinder 7 includes an annular body 701 and a piston 702. An annular groove 703 for accommodating the piston 702 is provided on the end surface of the annular body 701 facing the connecting ring 5. A hydraulic chamber 704 is provided on the outer ring surface of the annular body 701. The inner end of the hydraulic chamber 704 extends to communicate with the annular groove 703. One end surface of the piston 702 presses on the end surface of the connecting ring 5, and the other end surface of the piston 702 faces the hydraulic chamber 704 and communicates with the inner port of the annular groove 703. By pressing high-pressure oil into the hydraulic chamber 704 through a hydraulic pump, one side of the piston 702 is acted upon by the oil pressure to axially push the connecting ring 5 along the mandrel 1. The material of the mandrel 1 undergoes elastic deformation under the axial thrust. At this time, the fastening ring is tightened to fill the gap between the end surface of the hydraulic cylinder 7 and the fastening ring 6. Then, the hydraulic pressure is removed. The material of the mandrel 1 has a tendency to recover from the deformation, and the huge pressure generated by this tendency firmly presses the cemented carbide roll ring 2, the hydraulic cylinder 7, the spacer ring 301, and the retaining ring 302 on the mandrel 1.

[0042] In the above embodiment, two sealing rings 8 are provided between the piston 702 and the inner wall of the annular groove 703. The inner port of the hydraulic chamber 704 is located in the annular gap formed by the two sealing rings 8. The sealing rings 8 are beneficial to keeping the high-pressure oil in the hydraulic chamber 704 on one side of the piston 702 and ensuring the axial thrust of the piston 702.

[0043] In the above embodiment, the inner ring edge of the piston 702 extends axially along the mandrel 1 into the gap between the inner ring surface of the annular body 701 and the mandrel 1, further preventing the leakage of high-pressure oil.

[0044] The following briefly describes the assembly process of the entire cemented carbide combined roll:

[0045] 1) Lift the mandrel 1 and place it on the combined roll assembly fixing table to fix the mandrel 1;

[0046] 2) Heat the cemented carbide roll ring 2 in a heating furnace, take it out after keeping warm for a period of time;

[0047] 3) Assemble the retaining ring 302 on the mandrel 1 so that it abuts against the positioning ring 101, and then assemble the spacer ring 301 and the cemented carbide roll ring 2 at intervals;

[0048] 4) Install the hydraulic cylinder 7 on the mandrel 1 so that one side of the hydraulic cylinder 7 is in contact with the cemented carbide roll ring 2, and screw the connecting ring 5 and the fastening ring 6 tightly so that they are in close contact with the other side of the hydraulic cylinder 7;

[0049] 5) Use a hydraulic pump to pressurize the hydraulic cylinder 7 to create a gap between the fastening ring 6 and the end face of the hydraulic cylinder 7, then screw the fastening ring 6 tightly so that it is in close contact with the hydraulic cylinder 7, and release the pressure of the hydraulic cylinder 7 after maintaining the pressure for a certain period of time.

[0050] The parts not described in detail in this embodiment are prior art.

[0051] It should be noted that although the present invention has been described through the above embodiments, the present invention can also have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope protected by the appended claims of the present invention and their equivalents.

Claims

1. A cemented carbide composite roller, characterized in that: It comprises a core shaft (1) and a positioning ring (101) fixed at one end of the shaft body of the core shaft (1); a roller ring is sleeved on the shaft body of the core shaft (1); the roller ring comprises a hard alloy roller ring (2) and a baffle ring (3) arranged at intervals along the axial direction of the core shaft (1); the baffle ring (3) and the core shaft (1) are connected via a shaft key (4) for limiting the relative rotation of the two. A hydraulic locking piece is provided at the other end of the shaft body of the core shaft (1). The hydraulic locking piece and the positioning ring (101) squeeze the hard alloy roller ring (2) and the baffle ring (3) therebetween, and make the end faces of adjacent hard alloy roller rings (2) and baffle rings (3) abut against each other.

2. A cemented carbide composite roller according to claim 1, characterized in that: The hard alloy roller ring (2) is interference fit with the shaft body of the core shaft (1).

3. The cemented carbide composite roller according to claim 1, characterized in that: The spacer ring (3) comprises a spacer ring (301) located between adjacent hard alloy roller rings (2) and a baffle ring (302) fitted with the positioning ring (101); A positioning ring groove (303) matching with the positioning ring (101) is provided on the end surface of the retaining ring (302).

4. The cemented carbide composite roller according to claim 1, characterized in that: The hydraulic locking member comprises a connecting ring (5) threadedly connected to the outside of the core shaft (1), a fastening ring (6) threadedly connected to the outside of the connecting ring (5), and a hydraulic cylinder (7) located between the connecting ring (5) and the roller ring and capable of generating thrust along the axial direction of the core shaft (1).

5. A cemented carbide composite roller according to claim 4, characterized in that: The thrust of the hydraulic cylinder (7) can act on the core shaft (1) via the connecting ring (5), causing the core shaft (1) to produce axial tensile elastic deformation, and the fastening ring (6) can be tightened toward the hydraulic cylinder (7) after the core shaft (1) is tensilely deformed to fill the gap between the two.

6. A cemented carbide composite roller according to claim 5, characterized in that: The hydraulic cylinder (7) comprises an annular body (701) and a piston (702); An annular groove (703) for accommodating the piston (702) is provided on the end surface of the annular body (701) facing the connecting ring (5); a hydraulic chamber (704) is provided in the annular body (701); the inner end of the hydraulic chamber (704) extends to communicate with the annular groove (703); one end surface of the piston (702) is pressed against the end surface of the connecting ring (5); the other end surface of the piston (702) faces the hydraulic chamber (704) and is connected to the inner port of the annular groove (703).

7. A cemented carbide composite roller according to claim 6, characterized in that: Two sealing rings (8) are arranged between the piston (702) and the inner wall of the annular groove (703), and the inner port of the hydraulic chamber (704) is located in the annular gap formed by the two sealing rings (8).

8. The cemented carbide composite roller according to claim 6, characterized in that: The inner ring edge of the piston (702) extends along the axial direction of the core shaft (1) to the gap between the inner ring surface of the annular body (701) and the core shaft (1).

9. The cemented carbide composite roller according to claim 1, characterized in that: The core shaft (1) is a steel core shaft.

10. The cemented carbide composite roller according to claim 1, characterized in that: The baffle ring (3) is a steel roller ring.

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