High-precision work roll driving structure

Abstract

The application provides a high-precision work roll transmission structure and belongs to the technical field of copper strip rolling, comprising a transmission shaft sleeve, a first centering sleeve, two transmission clamping plates, a second centering sleeve and a work roll. A first hole section, a second hole section and a third hole section are formed in the first end of the transmission shaft sleeve. Two installation grooves are formed in the inner wall of the second hole section to install the two transmission clamping plates. The first centering sleeve is arranged in the first hole section, and the second centering sleeve is arranged in the third hole section. The end of the work roll has a first shaft section, a second shaft section and a third shaft section. The outer periphery of the second shaft section has two transmission planes to drive the two transmission clamping plates. The first shaft section and the third shaft section are respectively centered with the inner holes of the second centering sleeve and the first centering sleeve. Through the above arrangement, the centering function of the work roll and the flat shaft transmission function can be placed in different sections, the transmission precision and the surface quality of the rolled strip can be improved, and the problem of low transmission precision of the existing work roll transmission structure is solved.

Description

Technical Field

[0001] This invention relates to the field of copper strip rolling technology, and more specifically, to a high-precision work roll drive structure. Background Technology

[0002] In recent years, as copper strip products have developed towards high-end and high-precision directions, manufacturers have continuously increased their requirements for the surface quality of finished copper strips. Copper strip finishing mills typically undertake the final rolling process, and their operational accuracy directly affects the final quality of the copper strip. Among these factors, the transmission accuracy of the work rolls in the finishing mill is a crucial factor influencing the surface quality of the copper strip. When the transmission accuracy at the work roll shaft end is low, quality defects such as marks and scratches are easily generated on the copper strip surface, which can, in severe cases, lead to product downgrading or scrapping.

[0003] Existing work rolls typically employ flat shaft drives, with centering achieved through the cylindrical surface of the shaft segment. This means torque transmission and radial centering are concentrated on the same shaft segment. To accommodate roll changes, a certain clearance is usually required between this shaft segment and the drive bushing, resulting in poor centering accuracy. Furthermore, the relatively long contact surface between this shaft segment and the drive bushing makes roll feeding inconvenient. With increased usage time, wear on the mating surfaces further widens the clearance, leading to a further reduction in transmission accuracy and consequently affecting the surface quality of the copper strip. Summary of the Invention

[0004] The main objective of this invention is to provide a high-precision work roll drive structure to at least solve the problem of low transmission accuracy in existing work roll drive structures.

[0005] To achieve the above objectives, the present invention provides a high-precision work roller transmission structure, comprising: a transmission bushing, a first centering sleeve, two transmission clamping plates, a second centering sleeve, and a work roller; the first end of the transmission bushing has a first hole segment, a second hole segment, and a third hole segment arranged along the direction of the end face towards the bushing body, with the inner diameter decreasing sequentially; mounting grooves are respectively formed on opposite sides of the inner wall of the second hole segment; the first centering sleeve is disposed in the first hole segment; the two transmission clamping plates are respectively disposed in the two mounting grooves; and the second centering sleeve is disposed in the third hole segment; the end of the work roller has a first shaft segment, a second shaft segment, and a third shaft segment arranged along the direction of the end face towards the roller body, with the outer diameter increasing sequentially; the outer periphery of the second shaft segment also has two parallel transmission planes to form a flat shaft structure; wherein, the two transmission planes are respectively in transmission engagement with the two transmission clamping plates; the first shaft segment and the third shaft segment are respectively in centering engagement with the inner holes of the second centering sleeve and the first centering sleeve.

[0006] Furthermore, it also includes a universal joint cross and a key. The universal joint cross is connected to the second end of the drive shaft sleeve and is engaged with the second end of the drive shaft sleeve via the key.

[0007] Furthermore, the outer diameter of the cross-section of the second shaft segment is smaller than the inner diameter of the second hole segment, so that a radial gap is formed between the outer arc surface of the second shaft segment and the inner wall of the second hole segment.

[0008] Furthermore, the radial clearance between the outer arc surface of the second shaft segment and the inner wall of the second hole segment is 0.25 mm.

[0009] Furthermore, the minimum axial distance from the end face of the work roller to the third shaft segment is less than the axial distance from the end face of the first centering sleeve facing the first end of the transmission shaft sleeve to the end face of the second centering sleeve facing the first end, so that during the process of inserting the work roller into the transmission shaft sleeve, the third shaft segment and the first centering sleeve, and the first shaft segment and the second centering sleeve, form a centering fit in sequence.

[0010] Furthermore, the first shaft segment and the third shaft segment form clearance fits with the inner holes of the second centering sleeve and the first centering sleeve, respectively, and the clearance fit between the first shaft segment and the second centering sleeve is greater than the clearance fit between the third shaft segment and the first centering sleeve.

[0011] Furthermore, the inner holes of the first and second centering sleeves facing the first end of the transmission shaft sleeve, and the ends of the two transmission clamps facing the first end of the transmission shaft sleeve are all provided with guide chamfers; the ends of the first shaft section and the ends of the second shaft section facing the end face of the work roller are all provided with guide chamfers, and a transition chamfer is provided between the second shaft section and the third shaft section.

[0012] Furthermore, the first centering sleeve, the two transmission clamps, and the universal joint cross sleeve are all fixedly connected to the transmission shaft sleeve by fasteners.

[0013] Furthermore, both the first and second centering sleeves are self-lubricating copper sleeves.

[0014] This invention discloses a high-precision work roller transmission structure, comprising: a transmission bushing, a first centering sleeve, two transmission clamping plates, a second centering sleeve, and a work roller. The first end of the transmission bushing has a first, second, and third hole segment arranged along the end face towards the bushing body, with their inner diameters decreasing sequentially. The inner walls of the second hole segment have mounting grooves on opposite sides. The first centering sleeve is disposed within the first hole segment, and the two transmission clamping plates are respectively disposed within the two mounting grooves. The second centering sleeve is disposed within the third hole segment. The end of the work roller has a first, second, and third shaft segment arranged along the end face towards the roller body, with their outer diameters increasing sequentially. The outer periphery of the second shaft segment also has two parallel transmission planes to form a flat shaft structure. The two transmission planes are respectively engaged with the two transmission clamping plates. The first and third shaft segments are respectively centered with the inner holes of the second and first centering sleeves. By setting it up as described above, the centering function of the work roll and the flat shaft transmission function can be placed in different sections, which can reduce the radial wobble during the work roll transmission process, improve the transmission accuracy and the surface quality of the rolled strip, and solve the problem of low transmission accuracy in the existing work roll transmission structure. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 This is a schematic diagram of a high-precision work roller drive structure that can be selected according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the transmission shaft sleeve of a high-precision work roller transmission structure, which is optional according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of a work roller according to an embodiment of the present invention, which is an optional high-precision work roller drive structure.

[0019] Figure label:

[0020] 10. Drive shaft sleeve; 11. First hole section; 12. Second hole section; 13. Third hole section; 14. Mounting groove; 20. First centering sleeve; 30. Drive clamping plate; 40. Second centering sleeve; 50. Work roller; 51. First shaft section; 52. Second shaft section; 53. Third shaft section; 54. Drive plane; 60. Universal joint cross-shaped sleeve; 70. Key. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 and Figure 2 As shown, a high-precision work roller transmission structure according to an embodiment of the present invention includes a transmission shaft sleeve 10, a first centering sleeve 20, two transmission clamping plates 30, a second centering sleeve 40, and a work roller 50. The first end of the transmission shaft sleeve 10 has a first hole section 11, a second hole section 12, and a third hole section 13 arranged along the direction from the end face towards the sleeve body, with their inner diameters decreasing sequentially. Mounting grooves 14 are respectively formed on opposite sides of the inner wall of the second hole section 12. The first centering sleeve 20 is disposed within the first hole section 11, and the two transmission clamping plates 30 are respectively disposed on the two... Within the mounting groove 14, the second centering sleeve 40 is disposed within the third hole section 13. The end of the work roll 50 has a first shaft section 51, a second shaft section 52, and a third shaft section 53 arranged along the direction from the end face toward the roll body, with their outer diameters increasing sequentially. The outer periphery of the second shaft section 52 also has two parallel transmission planes 54 to form a flat shaft structure. The two transmission planes 54 are respectively engaged with two transmission clamps 30. The first shaft section 51 and the third shaft section 53 are respectively engaged with the inner holes of the second centering sleeve 40 and the first centering sleeve 20 for centering. Through the above arrangement, the centering function and the flat shaft transmission function of the work roll 50 can be placed in different sections, which can reduce the radial wobble of the work roll 50 during transmission, improve the transmission accuracy and the surface quality of the rolled strip, and solve the problem of low transmission accuracy in the existing work roll transmission structure.

[0023] Specifically, the first hole section 11 is located on the inlet side of the drive shaft sleeve 10, the third hole section 13 is located inside the sleeve body of the drive shaft sleeve 10, and the second hole section 12 is located between the first hole section 11 and the third hole section 13, thus forming a stepped hole structure arranged axially. Two mounting grooves 14 are arranged opposite each other, and the second centering sleeve 40 has a preset axial thickness, such as... Figure 2 As shown, the axial thickness can be denoted as L2. The shaft end structure of the work roller 50 is machined in conjunction with the internal structure of the transmission bushing 10. After the work roller 50 is assembled, the first shaft section 51 and the third shaft section 53 radially center the work roller 50 at two axially spaced positions. The second shaft section 52 transmits torque only through the two transmission planes 54 and the two transmission clamps 30.

[0024] Furthermore, such as Figure 1 and Figure 2As shown, the device also includes a universal joint cross arm 60 and a key 70. The universal joint cross arm 60 is connected to the second end of the drive shaft sleeve 10 and is driven by the key 70. The universal joint cross arm 60 is located on the side of the drive shaft sleeve 10 opposite to the insertion end of the work roll 50, and the key 70 is located at the end face mating position between the universal joint cross arm 60 and the drive shaft sleeve 10. During the rolling process, the rolling torque output by the universal joint cross arm 60 is transmitted to the drive shaft sleeve 10 via the key 70. The drive shaft sleeve 10 then acts on two drive planes 54 through two drive clamps 30 to drive the work roll 50 to rotate.

[0025] Furthermore, such as Figure 2 and Figure 3 As shown, the circumcircle diameter of the cross-section of the second shaft segment 52 is smaller than the inner diameter of the second hole segment 12, so that a radial clearance is formed between the outer circumferential surface of the arc of the second shaft segment 52 and the inner wall of the second hole segment 12. Specifically, the inner diameter of the second hole segment 12 in the region where the transmission clamping plate 30 is located is denoted as φD2, and the thickness between the two transmission planes 54 of the second shaft segment 52 matches the opening between the two transmission clamping plates 30. In a specific embodiment, the opening dimension between the two transmission clamping plates 30 is denoted as L4, with a tolerance of H8, and the thickness dimension of the flat shaft of the second shaft segment 52 is also L4, with a tolerance of e9, thus forming a planar clearance fit of L4H8 / e9. Since the circumcircle diameter of the cross-section of the second shaft segment 52 is smaller than the inner diameter of the second hole segment 12, the outer circumferential surface of the arc of the second shaft segment 52 does not participate in radial centering, and the torque is transmitted only through the planar fit between the two transmission planes 54 and the two transmission clamping plates 30. This reduces the contact area between the second shaft section 52 and the transmission shaft sleeve 10, lowers the insertion and extraction resistance, and avoids the flat shaft structure transmission from simultaneously undertaking the centering function.

[0026] Furthermore, the radial clearance between the outer arc surface of the second shaft segment 52 and the inner wall of the second hole segment 12 is 0.25 mm. Specifically, the inner diameter of the second hole segment 12 is φD2, and the outer diameter of the cross-section of the second shaft segment 52 is φD2 - 0.5 mm. When the second shaft segment 52 and the second hole segment 12 are coaxial, a 0.25 mm unilateral radial clearance is formed between the outer arc surface of the second shaft segment 52 and the inner wall of the second hole segment 12. This dimension provides clearance for the insertion of the work roller 50 while maintaining a stable transmission fit between the two transmission planes 54 and the two transmission clamps 30.

[0027] Furthermore, such as Figure 2 and Figure 3As shown, the minimum axial distance from the end face of the work roller 50 to the third shaft segment 53 is less than the axial distance from the end face of the first centering sleeve 20 facing the first end of the transmission shaft sleeve 10 to the end face of the second centering sleeve 40 facing the first end. This ensures that during the insertion of the work roller 50 into the transmission shaft sleeve 10, the third shaft segment 53 and the first centering sleeve 20, and the first shaft segment 51 and the second centering sleeve 40, form a centering fit sequentially. Specifically, the two distances are denoted as L3 and L1, respectively, and are both measured along the axial direction of the work roller 50. When changing rollers, the work roller 50 can be pushed in from the first end of the transmission shaft sleeve 10 using a roller changing trolley. In the initial stage of entry, the first shaft segment 51 first enters the transmission shaft sleeve 10 but does not contact it, and moves along the axial direction of the transmission shaft sleeve 10. As the work roller 50 continues to be pushed in, the first shaft segment 51 and the second shaft segment 52 successively enter between the two transmission clamps 30, and the two transmission planes 54 gradually form a fit with the two transmission clamps 30. After the second shaft segment 52 enters between the two transmission clamps 30, due to the aforementioned axial distance relationship, the third shaft segment 53 first enters the inner hole of the first centering sleeve 20 and forms a centering fit. After the work roller 50 continues to be pushed in, the first shaft segment 51 then enters the inner hole of the second centering sleeve 40 and forms a centering fit. This staged insertion and sequential centering method can avoid interference or jamming caused by simultaneous contact of two centering positions, making it easier for the work roller 50 to be inserted into the transmission shaft sleeve 10 and shortening the roller changing time.

[0028] Furthermore, such as Figure 2 and Figure 3 As shown, the first shaft segment 51 and the third shaft segment 53 form clearance fits with the inner holes of the second centering sleeve 40 and the first centering sleeve 20, respectively, and the clearance between the first shaft segment 51 and the second centering sleeve 40 is greater than the clearance between the third shaft segment 53 and the first centering sleeve 20. Specifically, the inner hole diameter of the first centering sleeve 20 is denoted as φD1, with a hole tolerance of H8, and the outer diameter of the third shaft segment 53 is denoted as φD1, with a shaft tolerance of f8, forming a small clearance fit of φD1 H8 / f8. The inner hole diameter of the second centering sleeve 40 is denoted as φD3, with a hole tolerance of D6, and the outer diameter of the first shaft segment 51 is also φD3, with a shaft tolerance of h6, forming a clearance fit of φD3 D6 / h6. The clearance of the φD3 D6 / h6 fit is greater than the clearance of the φD1 H8 / f8 fit, avoiding over-fitting. After the work roll 50 is fully inserted, the mating area between the first shaft section 51 and the second centering sleeve 40 constitutes the first centering zone, the mating area between the second shaft section 52 and the transmission clamp 30 constitutes the flat shaft transmission zone, and the mating area between the third shaft section 53 and the first centering sleeve 20 constitutes the second centering zone. By setting different centering mating clearances, the risk of interference or jamming between the two centering points due to machining or assembly errors can be reduced, and radial runout and impact during the transmission process of the work roll 50 can be limited.

[0029] Furthermore, such as Figure 2 and Figure 3As shown, the inner holes of the first centering sleeve 20 and the second centering sleeve 40 facing the first end of the transmission shaft sleeve 10, and the ends of the two transmission clamping plates 30 facing the first end of the transmission shaft sleeve 10 are all provided with guide chamfers; the ends of the first shaft section 51 and the ends of the second shaft section 52 facing the end face of the work roller 50 are also provided with guide chamfers, and a transition chamfer is provided between the second shaft section 52 and the third shaft section 53. In a specific embodiment, the inlet end of the first centering sleeve 20 is provided with a 5 mm × 45° guide chamfer, the inlet end of the second centering sleeve 40 is provided with a 5 mm × 15° guide chamfer, and the inlet ends of the two transmission clamping plates 30 are respectively provided with a 5 mm × 15° guide chamfer; the end of the first shaft section 51 is provided with a 5 mm × 15° guide chamfer, the end of the second shaft section 52 facing the end face of the work roller 50 is provided with a 15 mm × 30° guide chamfer, and the second shaft section 52 and the third shaft section 53 are smoothly connected by a 15° transition chamfer. The larger chamfer at the entrance of the first centering sleeve 20 guides the third shaft segment 53 into place. The chamfers at the ends of the second centering sleeve 40 and the first shaft segment 51 cooperate to guide the first shaft segment 51 into the second centering sleeve 40. The guide chamfer at the end of the second shaft segment 52 cooperates with the guide chamfer of the transmission clamp 30 to correct slight circumferential or radial deviations during the insertion of the flat shaft structure. The diameter change between the second shaft segment 52 and the third shaft segment 53 is small, and the transition chamfer can prevent direct collision at the step. The above-mentioned multi-stage chamfers form a continuous insertion guide, which can reduce the risk of bumps and jamming during the roll changing process of the work roll 50.

[0030] Furthermore, such as Figure 1 and Figure 2 As shown, the first centering sleeve 20, the two transmission clamps 30, and the universal joint cross arm 60 are all fixedly connected to the transmission shaft sleeve 10 by fasteners. Specifically, the fasteners can be bolts or screws. The two transmission clamps 30 are respectively placed in corresponding mounting slots 14 and fixed to the transmission shaft sleeve 10 by fasteners; the universal joint cross arm 60 is fixed to the second end of the transmission shaft sleeve 10 by bolts. The above-mentioned detachable fixing method facilitates the installation, maintenance, and replacement of the first centering sleeve 20 and transmission clamps 30 after wear, and can maintain the connection stability between the transmission shaft sleeve 10 and the universal joint cross arm 60.

[0031] Furthermore, both the first centering sleeve 20 and the second centering sleeve 40 are self-lubricating copper sleeves. Specifically, the first centering sleeve 20 and the second centering sleeve 40 adopt a copper sleeve structure with self-lubricating properties, forming the centering contact parts of the third shaft segment 53 and the first shaft segment 51, respectively.

[0032] A high-precision work roller transmission structure in this embodiment includes a transmission sleeve 10, a first centering sleeve 20, two transmission clamps 30, a second centering sleeve 40, and a work roller 50. The first end of the transmission sleeve 10 is sequentially provided with a first hole section 11, a second hole section 12, and a third hole section 13. The second hole section 12 has mounting grooves 14 on both sides for mounting the two transmission clamps 30. The first centering sleeve 20 and the second centering sleeve 40 are respectively disposed in the first hole section 11 and the third hole section 13. The end of the work roller 50 sequentially forms a first shaft section 51, a second shaft section 52, and a third shaft section 53. The second shaft section 52 has two parallel transmission planes 54, which cooperate with the two transmission clamps 30 to transmit torque. The first shaft section 51 and the third shaft section 53 cooperate with the second centering sleeve 40 and the first centering sleeve 20, respectively, to achieve two-point centering. The second end of the transmission sleeve 10 is connected to a universal joint cross arm 60, which transmits torque to the transmission sleeve 10 via a key 70. The outer diameter of the second shaft segment 52 is smaller than the inner diameter of the second hole segment 12, creating a radial gap of 0.25 mm between them, thus preventing the outer arc surface of the second shaft segment 52 from participating in centering. When the work roller 50 is inserted, the third shaft segment 53 first forms a centering fit with the first centering sleeve 20, and then the first shaft segment 51 forms a centering fit with the second centering sleeve 40. Both fits use clearance fits, and the clearance at the first shaft segment 51 is greater than the clearance at the third shaft segment 53. In addition, guide chamfers are provided on the first centering sleeve 20, the two transmission clamps 30, and the second centering sleeve 40. A transition chamfer is provided between the second shaft segment 52 and the third shaft segment 53. The first centering sleeve 20, the transmission clamps 30, and the universal joint cross sleeve 60 are all fixed to the transmission shaft sleeve 10 by fasteners. Both centering sleeves are self-lubricating copper sleeves.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-precision work roller drive structure, characterized in that, It includes a drive shaft sleeve (10), a first centering sleeve (20), two drive clamps (30), a second centering sleeve (40), and a work roller (50). The first end of the transmission shaft sleeve (10) is provided with a first hole section (11), a second hole section (12) and a third hole section (13) arranged along the end face toward the sleeve body and with the inner diameter decreasing sequentially. The inner walls of the second hole section (12) are respectively provided with mounting grooves (14). The first centering sleeve (20) is disposed in the first hole section (11). The two transmission clamps (30) are respectively disposed in the two mounting grooves (14). The second centering sleeve (40) is disposed in the third hole section (13). The end of the work roller (50) has a first shaft section (51), a second shaft section (52) and a third shaft section (53) arranged along the end face toward the roller body and with the outer diameter increasing sequentially. The outer periphery of the second shaft section (52) also has two parallel transmission planes (54) to form a flat shaft structure. Among them, the two transmission planes (54) are respectively in transmission cooperation with the two transmission clamps (30); the first shaft segment (51) and the third shaft segment (53) are respectively in centering cooperation with the inner hole of the second centering sleeve (40) and the first centering sleeve (20).

2. The high-precision work roller transmission structure according to claim 1, characterized in that, It also includes a universal joint cross arm (60) and a key (70), wherein the universal joint cross arm (60) is connected to the second end of the drive shaft sleeve (10) and is in transmission engagement with the second end of the drive shaft sleeve (10) through the key (70).

3. The high-precision work roller drive structure according to claim 1, characterized in that, The diameter of the outer circle of the cross section of the second shaft segment (52) is smaller than the inner circle diameter of the second hole segment (12) so that a radial gap is formed between the outer arc surface of the second shaft segment (52) and the inner wall of the second hole segment (12).

4. The high-precision work roller transmission structure according to claim 3, characterized in that, The radial gap between the outer arc surface of the second shaft segment (52) and the inner wall of the second hole segment (12) is 0.25 mm.

5. The high-precision work roller drive structure according to claim 1, characterized in that, The minimum axial distance from the end face of the work roller (50) to the third shaft segment (53) is less than the axial distance from the end face of the first centering sleeve (20) toward the first end of the transmission shaft sleeve (10) to the end face of the second centering sleeve (40) toward the first end, so that during the process of inserting the work roller (50) into the transmission shaft sleeve (10), the third shaft segment (53) and the first centering sleeve (20), and the first shaft segment (51) and the second centering sleeve (40) sequentially form a centering fit.

6. The high-precision work roller transmission structure according to claim 1, characterized in that, The first shaft segment (51) and the third shaft segment (53) respectively form a clearance fit with the inner hole of the second centering sleeve (40) and the first centering sleeve (20), and the clearance between the first shaft segment (51) and the second centering sleeve (40) is greater than the clearance between the third shaft segment (53) and the first centering sleeve (20).

7. The high-precision work roller drive structure according to claim 1, characterized in that, The first centering sleeve (20) and the second centering sleeve (40) are provided with guide chamfers at the inner hole openings of the first end of the transmission shaft sleeve (10) and at the ends of the two transmission clamps (30) facing the first end of the transmission shaft sleeve (10); the ends of the first shaft segment (51) and the ends of the second shaft segment (52) facing the end face of the work roller (50) are provided with guide chamfers, and a transition chamfer is provided between the second shaft segment (52) and the third shaft segment (53).

8. The high-precision work roller drive structure according to claim 2, characterized in that, The first centering sleeve (20), the two transmission clamps (30) and the universal joint cross sleeve (60) are all fixedly connected to the transmission shaft sleeve (10) by fasteners.

9. The high-precision work roller drive structure according to claim 1, characterized in that, Both the first centering sleeve (20) and the second centering sleeve (40) are self-lubricating copper sleeves.

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