A bar pre-cutting pinch roll ring structure

Abstract

This invention discloses a pre-shearing clamping roller ring structure for clamping bars, comprising upper and lower roller rings. The inner center of each roller ring has symmetrically arranged arc-shaped segments AB and EF of equal length, adapted to the bar. The roller ring structure of this invention is novel and reasonable in design, simple in structure, and has a larger contact surface between the upper and lower roller rings and the bar, increasing friction during transmission, improving transmission power and efficiency, and reducing transmission errors during high-speed steel feeding. This provides an important prerequisite for high-precision shearing by high-speed multiple-length flying shears. Simultaneously, the design of the roller ring profile considers the expansion of the bar after heating, reducing the compression of the bar by the roller ring during clamping and reducing deformation during transmission. Furthermore, the roller ring structure proposed in this invention is more "closed," able to "enclose" the bar to a greater extent within a larger circumference, especially in the horizontal direction, ensuring that lateral deformation during clamping is within a controllable range.

Description

Technical Field

[0001] This invention belongs to the field of machinery and relates to a pinch roller ring structure, and more particularly to a pinch roller ring structure for bar shearing. Background Technology

[0002] The pre-shear pinch roll is one of the key pieces of equipment in a high-speed steel production line. Installed before the multiple-length flying shear, the pinch roll clamps the bar stock and feeds it into the shear. The pre-shear pinch roll maintains a constant speed for the bar stock to ensure the accuracy of the multiple-length shearing. During operation, the roll ring of the pre-shear pinch roll directly contacts the high-speed driven bar stock, clamping it as it enters the high-speed multiple-length flying shear for shearing. Therefore, the structural shape of the roll ring has a direct and significant impact on the clamping force and transmission accuracy of the high-speed bar stock.

[0003] Traditional pre-shear clamping roller ring structures have roller ring grooves that are either fully circular or V-shaped, as shown below. Figure 1 and Figure 2 As shown, in Figure 1 In this process, the bar stock only has two points of contact with the pinch roller rings (the upper and lower roller rings 1′ and 2′ each have one point that contacts the bar stock 3′ at points A′ and B′, referred to as two-point contact). This results in a very small contact area during bar stock transmission, leading to relatively low friction and thus a larger transmission error, affecting transmission efficiency and subsequent flying shear cutting accuracy. Figure 2 In the V-groove roller rings shown, the upper and lower roller rings 1″ and 2″ each have two points A″, B″, C″, and D″ that contact the bar 3″. This results in a total of four contact points during the transfer process (referred to as four-point contact). This contact condition is improved compared to two-point contact, but the contact area is still not large enough. Meanwhile, Figure 1 The traditional roller ring structure shown overemphasizes the symmetry of the upper and lower structures, and the horizontal direction of the bar is in an "open" state, making it easy to "flatten" the bar during the transfer process. In addition, the traditional roller ring structure design does not take into account the thermal expansion of the bar. Summary of the Invention

[0004] To address the issues of insufficient contact area between the existing clamping roller ring structure and the workpiece, as well as the lack of consideration for the thermal expansion of the bar stock, the present invention provides a bar stock clamping roller ring structure before shearing.

[0005] The technical solution of this invention to solve the technical problem is as follows:

[0006] The present invention discloses a bar pre-shearing clamping roller ring structure for clamping bar stock, comprising an upper roller ring and a lower roller ring arranged vertically. Its feature is that the inner center of the upper roller ring and the lower roller ring are respectively symmetrically provided with arc-shaped segments AB and EF of equal length and adapted to the bar stock.

[0007] As a further improvement to the technical solution of the present invention, the arc lengths of the arc segment AB and the arc segment EF are one-fifth to one-third of the circumference of the bar, respectively.

[0008] Preferably, the arc lengths of the arc segments AB and EF are each one-quarter of the circumference of the bar.

[0009] As a further improvement to the technical solution of the present invention, tangent segments OA and BC are respectively provided tangently on both sides of the arc segment AB, and the outer sides of tangent segments OA and BC are respectively horizontal edge segments OM and CN; tangent segments DE and GF are respectively provided tangently on both sides of the arc segment EF, and the outer sides of tangent segments DE and GF are respectively horizontal edge segments DK and GH.

[0010] As a further improvement to the technical solution of the present invention, the edge segment OM and the edge segment DK are on the same horizontal line.

[0011] As a further improvement to the technical solution of the present invention, both the edge segment OM and the edge segment DK are located on the horizontal line passing through the center of the bar.

[0012] As a further improvement to the technical solution of the present invention, the edge segment CN and the edge segment GH are located above and below the horizontal line passing through the center of the bar, respectively.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1) First, the contact area between the pinch roller ring and the bar is larger, changing from the traditional two-point or four-point contact to half-circumferential contact, which increases the friction during the transmission process, thereby improving the transmission power and transmission efficiency, reducing the transmission error of high-speed steel feeding, and providing an important prerequisite for the high-precision shearing of high-speed multiple-length flying shears.

[0015] Secondly, the design of the roller ring profile takes into account the expansion of the bar after heating, which reduces the squeezing of the bar by the roller ring during the clamping process, thereby reducing the deformation of the bar during the transmission process.

[0016] Finally, compared with the traditional roller ring structure, the roller ring structure proposed in this invention is more "closed", which can "enclose" the bar to a greater extent in a larger circumferential range, especially in the horizontal direction of the bar, so that the lateral force deformation during clamping is within a controllable range. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first existing pre-shearing pinch roller ring;

[0018] Figure 2 This is a schematic diagram of the structure of the second type of pre-shear pinch roller ring;

[0019] Figure 3 This is a schematic diagram of the structure of the pre-shearing pinch roller ring described in this invention;

[0020] In the diagram: 1, 1′, 1″, upper roller ring; 2, 2′, 2″, lower roller ring; 3, 3′, 3″, bar stock. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0023] like Figure 3 As shown, a bar shearing clamping roller ring structure is used to clamp bar 3. It includes an upper roller ring 1 and a lower roller ring 2 arranged vertically. At the inner center of the upper roller ring 1 and the lower roller ring 2, there are arc-shaped segments AB and EF of equal length adapted to the bar 3, respectively. The radius of the arc segments AB and EF is calculated based on the radius of the bar 3 and its thermal expansion coefficient. With this design, when the bar 3 is clamped by the upper roller ring 1 and the lower roller ring 2, the shortcomings of the traditional technology of only two-point contact or four-point contact with small contact lengths are overcome. The bar 3 has an arc segment at both the top and bottom that contacts the upper and lower roller rings 1 and 2. At the same time, the clamping of the bar 3 also takes into account the influence of thermal expansion on the diameter of the bar 3, reducing the influence of clamping deformation on the size of the bar 3.

[0024] In this embodiment, in order to better clamp the bar 3 with the upper and lower roller rings 1 and 2, the arc lengths of the arc segments AB and EF are one-fifth to one-third of the circumference of the bar 3, respectively. Preferably, the arc lengths of the arc segments AB and EF are one-quarter of the circumference of the bar 3, respectively. This arrangement ensures that during the clamping process of the bar 3, the total contact length between the upper and lower roller rings 1 and 2 and the circumference of the bar 3 is half of the entire circumference, effectively improving the shortcomings of the traditional technology where the contact length between the clamping roller rings and the bar is small.

[0025] In this embodiment, tangent segments OA and BC are respectively arranged tangently on both sides of the arc segment AB, with tangency points A and B respectively. The outer sides of tangent segments OA and BC are respectively horizontal edge segments OM and CN. Similarly, tangent segments DE and GF are respectively arranged tangently on both sides of the arc segment EF, with tangency points E and F respectively. The outer sides of tangent segments DE and GF are respectively horizontal edge segments DK and GH. This arrangement provides space for possible deformation during the hot deformation and clamping process of the bar 3, and results in a smooth deformation profile.

[0026] In this embodiment, the edge segment OM and the edge segment DK are on the same horizontal line. Furthermore, the edge segment OM and the edge segment DK are both located on the horizontal line passing through the center of the bar 3. The advantage of this arrangement is that it effectively ensures that when the bar 3 is clamped using the roller ring structure, the amount of horizontal deformation that may occur in the bar 3 during the clamping process is within a controllable range.

[0027] In addition, in this embodiment, the edge segment CN and the edge segment GH are located above and below the horizontal line passing through the center of the bar 3, respectively. This arrangement can effectively avoid the collision between the arc-shaped segments OM and CN of the upper roller ring 1 and the arc-shaped segments GH and DK of the lower roller ring 2 during the clamping of the bar 3.

Claims

1. A structure of a roll ring of a pre-shearing pinch roll for clamping a bar (3), comprising an upper roll ring (1) and a lower roll ring (2) arranged in an upper and lower relationship, characterized in that: The inner side center of the upper roller ring (1) and the lower roller ring (2) is respectively provided with an arc segment AB and an arc segment EF which are equal in length and are matched with the bar (3); The two sides of the arc segment AB are respectively provided with tangent segments OA and BC, and the outer sides of the tangent segments OA and BC are horizontal edge segments OM and CN respectively; the two sides of the arc segment EF are respectively provided with tangent segments DE and GF, and the outer sides of the tangent segments DE and GF are horizontal edge segments DK and GH respectively; The edge segments OM and GH are located on the same side of the bar (3), and the edge segments CN and DK are located on the other side of the bar (3); The edge segments OM and DK are on the same horizontal line; The edge segments OM and DK are both located on the horizontal line passing through the center of the bar (3); The edge segments CN and GH are respectively located above and below the horizontal line passing through the center of the bar (3); The arc segments AB and EF are respectively one fifth to one third of the circumference of the bar (3); The corresponding arc radii of the arc segments AB and EF are calculated according to the radius of the bar (3) and its thermal expansion coefficient, so as to ensure that when the bar (3) is clamped by the upper roller ring (1) and the lower roller ring (2), there is an arc segment above and below the bar (3) which is in contact with the upper roller ring (1) and the lower roller ring (2).

2. A bar shear pre-cut pinch roll ring structure according to claim 1, characterised in that, The arc segments AB and EF are respectively one fourth of the circumference of the bar (3).

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