A device for improving the self-centering function of a roll

Abstract

The utility model relates to metal pipe cold rolling process field discloses a device that improves the function of roller self-centering, including two racks, the inner wall of two racks is provided with a plurality of rolling body assemblies, including side rolling body assembly and lower rolling body assembly, the inside of the top of rack is provided with adjusting mechanism, the rolling body assembly includes a plurality of rolling body support plates, a plurality of rolling body support plates all are screw -threaded connection in the inner wall of two racks, the top of rolling body support plate is connected with rolling body support with sliding, every rolling body support plate with rolling body support is through a plurality of special bolt sliding connection, and the rack is connected with a plurality of detachable assemblies. In the utility model, the sliding friction between the device each main internal structure changes into rolling friction, reduces the friction, reduces the resistance in the self-centering process, thereby improves the function of roller self-centering.

Description

Technical Field

[0001] This utility model relates to the field of cold rolling process of metal tubes, and in particular to a device for improving the self-centering function of rolls. Background Technology

[0002] In the production of metal tubes using the Pilger two-roll cold rolling mill, the self-centering function of the rolls is a key technology in the cold rolling process, directly affecting the processing accuracy and efficiency of the finished tubes. During operation, the tube blank deforms from a large outer diameter to a small outer diameter and from a thick wall to a thinner wall. The reciprocating motion of the mill frame drives the rolls to roll the tube blank surface between the front and rear starting points. The rolls repeatedly roll the tube blank with the grooves, gradually shaping the finished tube.

[0003] The Pilger two-roll cold rolling mill uses a pair of rolls with variable cross-section grooves and a mandrel. The cross-section of the grooves gradually changes, with the maximum cross-section diameter being larger than the outer diameter of the billet and the minimum cross-section equal to the outer diameter of the finished pipe. The mandrel is geometrically matched with the inner hole of the finished pipe. Utilizing the plastic deformation of the billet during rolling, the billet is automatically centered in the rolling direction. The radial pressure applied by the rolls to the billet is evenly distributed in the circumferential direction of the billet, forming a force balance and ensuring that the center of the billet coincides with the center of the grooves. During the rolling process, each time the rolls are at the starting point, the billet and the mandrel rotate synchronously at a specific angle, and the billet is fed a certain distance along the rolling direction. Combined with reciprocating motion, the pipe is rolled.

[0004] In the prior art, there is a large sliding friction between the side of the bearing housing of the upper and lower roll assemblies and the inner side of the frame, the bottom surface of the bearing housing of the lower roll assembly and the inner bottom surface of the frame, the upper surface of the bearing housing of the upper roll assembly and the adjusting wedge, and the bearing housings of the upper and lower roll assemblies. This has a significant negative impact on the self-centering effect, resulting in elliptical shapes, uneven wall thickness, and poor surface finish in the rolled pipes. These phenomena are particularly pronounced when producing thin-walled pipes. Therefore, a device to improve the self-centering function of the rolls is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a device for improving the self-centering function of rolls, aiming to improve the problem that the excessive internal sliding friction in the prior art leads to poor self-centering function.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for improving the self-centering function of rolls includes two frames. Multiple rolling element assemblies, including side rolling element assemblies and lower rolling element assemblies, are arranged on the inner walls of the two frames. Each rolling element assembly includes multiple rolling element support plates, each with multiple threaded mounting holes, which connect to the inner walls of the two frames. An adjustment mechanism is located inside the top of each frame, in which the lower part of an adjusting wedge slides in contact with the upper rolling element assembly. A rolling element bracket is slidably connected to the top of each rolling element support plate. Each rolling element bracket has multiple bracket threaded holes, each connected to a specific bolt. The rolling element support plate and the rolling element bracket are slidably connected by the specific bolts. Each rolling element bracket contains multiple rolling elements, each of which is freely rotatable. The frames are connected to multiple detachable components.

[0008] As a further description of the above technical solution:

[0009] The adjustment mechanism includes four lead screws, which are externally fixedly connected to the inside of the frame, and the ends of the lead screws are pressed against adjusting wedges;

[0010] As a further description of the above technical solution:

[0011] The space formed by the side rolling element assembly, the lower rolling element assembly, and the adjustment mechanism contains the upper roll assembly and the lower roll assembly, and there are four intermediate rolling element assemblies between the upper roll assembly and the lower roll assembly;

[0012] As a further description of the above technical solution:

[0013] The upper roll assembly has a roll rotatably connected inside, and the lower roll assembly has another roll rotatably connected inside; the rolls are used in pairs.

[0014] As a further description of the above technical solution:

[0015] The intermediate rolling element assembly includes multiple spring seats, the bottom of which is movably connected to the interior of the lower roll assembly. Each spring seat is equipped with a rolling bearing, and a small shaft is rotatably connected inside the rolling bearing.

[0016] As a further description of the above technical solution:

[0017] The detachable assembly includes multiple lower rolling element assembly fixing bolts a and multiple side rolling element assembly fixing bolts a;

[0018] As a further description of the above technical solution:

[0019] The upper roll assembly is fixedly connected to multiple stops, and the adjacent sides of the multiple stops are slidably connected to the outside of the upper rolling element assembly. The bottom of the adjusting wedge is slidably connected to the top of the rolling element in the upper rolling element assembly.

[0020] As a further description of the above technical solution:

[0021] Each of the rolls has a groove on its outer side;

[0022] This utility model has the following beneficial effects:

[0023] In this invention, the frame contacts other structures of the device through each rolling element assembly, thereby transforming the sliding friction between the main internal structures into rolling friction and reducing frictional force. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a device for improving the self-centering function of rolling mills according to the present invention.

[0025] Figure 2 This is a schematic diagram of the roll assembly mechanism of the device for improving the self-centering function of rolls proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the frame of a device for improving the self-centering function of rolls proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the rolling element assembly of a device for improving the self-centering function of a roll, as proposed in this utility model.

[0028] Figure 5 This is a schematic diagram of the intermediate rolling element assembly of a device for improving the self-centering function of a roll, as proposed in this utility model.

[0029] Legend:

[0030] 1. Frame; 2. Stop; 3. Adjustment mechanism; 31. Lead screw; 32. Adjusting wedge; 4. Roll assembly mechanism; 401. Upper rolling element assembly; 402. Side rolling element assembly; 403. Lower rolling element assembly; 41. Roll; 42. Rolling element support plate; 43. Specific bolt; 44. Rolling element bracket; 45. Rolling element; 46. Bracket threaded hole; 47. Detachable component; 4701. Lower rolling element assembly fixing bolt a; 4702. Side rolling element assembly fixing bolt a; 48. Intermediate rolling element assembly; 4801. Rolling bearing; 4802. Spring seat; 4803. Small shaft; 49. Rolling element assembly fixing threaded mounting hole; 5. Lower roll assembly; 6. Upper roll assembly. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 4 This utility model provides an embodiment of a device for improving the self-centering function of rolling mill rolls, comprising two frames 1 for fixing the entire device structure and ensuring the stability of the device. Multiple side rolling element assemblies 402 are provided on the inner walls of the two frames 1, and multiple lower rolling element assemblies 403 are provided on the inner bottom surfaces of the two frames 1. An adjustment mechanism 3 is provided inside the top of the frames 1 for adjusting the distance between the rolling mill rolls, thereby adjusting the size of the produced metal tube. The multiple side rolling element assemblies 402 and the multiple lower rolling element assemblies 403 include multiple rolling element support plates 42. The interior of the multiple rolling element support plates 42 is provided with multiple rolling element assembly fixing threaded mounting holes 49, which are connected to the inner walls of the two frames 1. Each rolling element support 44 is internally threaded with multiple specific bolts 43, and the rolling element support plates 42 are slidably connected to the rolling element supports 44 through the specific bolts 43.

[0033] Each rolling element support 44 has a hole containing a rolling element 45. The rolling element support 44 ensures that the rolling elements 45 are evenly distributed and can roll easily within the support, thus converting sliding friction into rolling friction. The roll assembly mechanism 4 is installed in the space formed by multiple side rolling components 402, multiple lower rolling element components 403, and the adjusting mechanism 3. In the prior art, the roll assembly mechanism 4 is in direct contact with the inner wall of the frame 1, and the self-centering fine-tuning movement of the roll assembly mechanism 4 is a sliding friction with the inner wall of the frame 1. With this invention, the roll assembly mechanism 4 contacts the rolling elements 45 in the side rolling element components 402 and the lower rolling element components 403, and the self-centering fine-tuning movement of the roll assembly 4 becomes rolling friction. The frame 1 is connected to multiple detachable components 47 for connecting the frame 1 and the rolling element support plate 42. The adjustment mechanism 3 includes four lead screws 31. The lead screws 31 are externally fixedly connected to the inside of the frame 1. The ends of the lead screws 31 press against the adjusting wedges 32. When the lead screws 31 rotate, the adjusting wedges can move horizontally. The bottom of the wedges 32 is an inclined surface, which can adjust the height of the structure below when moving horizontally.

[0034] Reference Figure 1 , Figure 2 and Figure 5The upper roll assembly 6 and the lower roll assembly 5 are housed within the space formed by the side rolling element assembly 402, the lower rolling element assembly 403, and the adjusting mechanism 3. The upper roll assembly 6 and the lower roll assembly 5 can be used to adjust the roll position. There are multiple intermediate rolling element assemblies 48 between the upper roll assembly 6 and the lower roll assembly 5, which change the friction between them from the original sliding friction to rolling friction. A roll 41 is rotatably connected inside the upper roll assembly 6, and another roll 41 is rotatably connected inside the lower roll assembly 5. The two rolls 41 are used in pairs and combined to periodically roll the billet into a finished metal tube. The intermediate rolling element assembly 48 includes multiple spring seats 4802. The bottom of the multiple spring seats 4802 is movably connected to the inside of the lower roll assembly 5. Each spring seat 4802 is provided with a rolling bearing 4801, which can rotate in a fixed position to reduce the friction between the contact surfaces. A small shaft 4803 is rotatably connected inside the rolling bearing 4801, so that the rolling bearing 4801 rotates in the spring seat 4802. The spring seat 4802 is used to support the rolling bearing 4801.

[0035] The detachable component 47 includes multiple lower rolling element assembly fixing bolts a4701 and multiple side rolling element assembly fixing bolts a4702. The lower rolling element assembly fixing bolts a4701 are fixedly connected to the lower side of the inner wall of the frame 1, and the side rolling element assembly fixing bolts a4702 are fixedly connected to the left and right sides of the inner wall of the frame 1. Each upper roll assembly 6 is fixedly connected with multiple stops 2. Every four stops 2 are used to fix the position of one upper rolling element assembly 401. The bottom of the adjusting wedge 32 slides in contact with the top of the rolling element 45 in the upper rolling element assembly 401. A groove is opened on the outside of each roll 41.

[0036] Working principle: When the cold rolling mill starts working, the reciprocating motion of the frame 1 drives the rolls 41 to roll the tube blank surface between the front and rear starting points. When the rolls 41 are at the front starting point, the tube blank separates from the groove. The tube blank rotates at a certain angle and is fed a certain distance. The mandrel in the tube blank rotates synchronously at the same angle as the tube blank, but is not fed. After the rotation and feeding actions are completed, the rolls 41 roll the tube blank with the groove. Through repeated work, the finished tube is gradually formed. In this process, because rolling element components are added between the bearing seat side of the roll assembly mechanism 4 and the inner wall side of the frame 1, and between the bottom surface of the bearing seat of the lower roll assembly 5 and the inner wall bottom surface of the frame 1, the sliding friction between the roll assembly mechanism 4 and the inner wall of the frame 1 is changed to rolling friction. The fine adjustment movement resistance is smaller and more flexible. The detachable component 47 is fixedly connected to the frame 1 by the fixed threaded mounting hole 49 of the rolling element assembly. The detachable component 47 consists of the lower rolling element assembly fixing bolt a4701 and the side rolling element assembly fixing bolt a4702.

[0037] An upper rolling element assembly 401 is added between the upper surface of the bearing seat of the upper roll assembly 6 and the lower surface of the adjusting wedge 32. The stop block 2 is fixedly connected to the bearing seat of the upper roll assembly 6 and presses the support plate 42 in the upper rolling element assembly 401. Therefore, the sliding friction between the roll assembly mechanism 4 and the adjusting mechanism 3 is changed to rolling friction, resulting in less resistance to fine-tuning and greater flexibility.

[0038] An intermediate rolling element assembly 48 was added between the lower roll assembly 5 and the upper roll assembly 6. The intermediate rolling element assembly 48 consists of a rolling bearing 4801, a spring seat 4802, and a small shaft 4803. The intermediate rolling element assembly 48 changes the original sliding friction between the upper roll assembly 6 and the lower roll assembly 5 into rolling friction, resulting in less resistance and greater flexibility in fine-tuning movement.

[0039] When it is necessary to adjust the distance between the rolls 41, the adjustment is made by adjusting the mechanism 3. By rotating the screw 31, the adjusting wedge 32 is moved horizontally. Since the lower side of the adjusting wedge 32 is an inclined plane, the distance between the upper roll assembly 6 and the lower roll assembly 5 is changed when it moves horizontally, thereby changing the distance between the rolls 41 and thus adjusting the size of the finished tube.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for improving the self-centering function of rolls, comprising two frames (1), characterized in that: The inner walls of the two frames (1) are provided with multiple rolling element assemblies, including a side rolling element assembly (402) and a lower rolling element assembly (403). An adjustment mechanism (3) is provided inside the top of the frame (1). The lower part of the adjustment wedge (32) in the adjustment mechanism (3) is in sliding contact with the upper rolling element assembly (401). The rolling element assembly includes multiple rolling element support plates (42). Each rolling element support plate (42) has multiple rolling element assembly fixing threaded mounting holes (49) inside. The rolling element support plates (42) are connected to the inner walls of the two frames (1) through the threaded mounting holes (49). A rolling element bracket (44) is slidably connected to the top of each rolling element support plate (42). Each rolling element bracket (44) has multiple threaded holes (46) inside, and each threaded hole (46) inside the rolling element bracket (44) is connected to a specific bolt. (43) The rolling element support plate (42) and the corresponding rolling element bracket (44) are slidably connected by a plurality of specific bolts (43). Each rolling element bracket (44) is equipped with a plurality of rolling elements (45). The frame (1) is connected with a plurality of detachable components (47). The upper roll assembly (6) and the lower roll assembly (5) are placed in the space composed of the side rolling element assembly (402), the lower rolling element assembly (403), and the adjusting mechanism (3). The upper rolling element assembly (401) is fixedly connected above the bearing seat of the upper roll assembly (6).

2. The device for improving the self-centering function of rolls according to claim 1, characterized in that: The adjustment mechanism (3) includes four lead screws (31), the outside of which is fixedly connected to the inside of the frame (1), and the ends of the lead screws (31) are pressed against the adjusting wedges (32).

3. The device for improving the self-centering function of rolls according to claim 1, characterized in that: The space formed by the side rolling element assembly (402), the lower rolling element assembly (403), and the adjustment mechanism (3) contains the upper rolling roll assembly (6) and the lower rolling roll assembly (5), and there are four intermediate rolling element assemblies (48) between the upper rolling roll assembly (6) and the lower rolling roll assembly (5).

4. The device for improving the self-centering function of rolls according to claim 3, characterized in that: The upper roll assembly (6) has a roll (41) rotatably connected inside, and the lower roll assembly (5) has another roll (41) rotatably connected inside. The two rolls (41) are used in pairs.

5. The device for improving the self-centering function of rolls according to claim 3, characterized in that: The intermediate rolling element assembly (48) includes a plurality of spring seats (4802), the bottoms of which are movably connected to the interior of the lower roll assembly (5). Each spring seat (4802) is provided with a rolling bearing (4801), and a small shaft (4803) is rotatably connected inside the rolling bearing (4801).

6. The device for improving the self-centering function of rolls according to claim 1, characterized in that: The detachable assembly (47) includes a plurality of lower rolling element assembly fixing bolts a (4701) and a plurality of side rolling element assembly fixing bolts a (4702).

7. The device for improving the self-centering function of rolls according to claim 1, characterized in that: The upper roll assembly (6) is fixedly connected with a plurality of stops (2), and the adjacent sides of the plurality of stops (2) are slidably connected to the outside of the rolling element assembly (401). The bottom of the adjusting wedge (32) is slidably connected to the top of the rolling element (45) in the upper rolling element assembly (401).

8. The device for improving the self-centering function of rolls according to claim 4, characterized in that: All of the rolls (41) have grooves on their outer surfaces.

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