Fly hammer device for removing large size round billet cutting burrs

Abstract

The application discloses a fly hammer device suitable for removing cutting tumors of large-size round billets, which is used for removing the cutting tumors on the continuous casting round billets. The fly hammer device suitable for removing the cutting tumors of the large-size round billets comprises a fly hammer, one end of the fly hammer is provided with a limiting pin hole, and the end face of the other end of the fly hammer is a special-shaped face. The special-shaped face is composed of a plurality of generatrices arranged along the hole axis direction of the limiting pin hole. In the plane perpendicular to the hole axis of the limiting pin hole, the generatrix is a circular curve, the distance from the generatrix to the hole axis of the limiting pin hole is S, and the minimum distance from the continuous casting billet to the hole axis of the limiting pin hole is L, wherein S < L. The fly hammer device is installed on a continuous casting billet delivery roller way, and the head end and the tail end of the continuous casting billet can be hammered by the fly hammer in the process of the continuous casting billet delivery, so that the cutting tumors are removed. Through the above structural design, the fly hammer rotation in the application can completely remove the cutting tumors without causing damage to the surface of the continuous casting billet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy, in particular to the technical field of continuous casting, more particularly to a fly hammer device suitable for removing cutting nubs of large-diameter round billets. BACKGROUND

[0002] In the continuous casting production process of modern steel mills, the continuous casting billets are generally subjected to flame cutting after the straightening machine, that is, flame cutting, which refers to the cutting of continuous casting billets by flame. This cutting technology uses gas and oxygen to make the billet burn quickly to achieve the purpose of cutting the billet.

[0003] In the prior art, for square billets or rectangular billets with a size greater than 180mm*180mm and round billets with a diameter greater than 180mm, the cutting is basically achieved by flame cutting. During the flame cutting operation, regardless of the type of gas source, such as acetylene or methane, liquid cutting steel will inevitably be produced, which will adhere to the lower part of the cutting surface after cooling to form a cutting nub. If the cutting nub cannot be cleaned in time, the billet with the cutting nub will be directly transferred to the next process (rolling mill). The cutting nub remaining on the continuous casting billet (billet with cutting nub) cannot be removed during the heating process and the high-pressure water treatment process before rolling. If the continuous casting billet with the nub enters the rolling mill, it will have adverse consequences, mainly including: 1. The cutting nub will damage the surface of the roller; 2. The cutting nub will be crushed and embedded into the surface of the rolled piece and spread, resulting in metallurgical defects such as heavy skin and grooves on the surface of the rolled piece.

[0004] Due to the limitations of size, site and equipment structure, a deburring machine is generally arranged on a slab continuous casting machine. However, for a multi-machine multi-flow round billet continuous casting machine, a similar device is generally not used. However, with the expansion of the size of the casting machine and the improvement of the yield rate of the subsequent process, the influence of the cutting nub has become an important reason for the improvement of the technical and economic indicators of the steel mill.

[0005] A slab continuous casting machine has sufficient width and inter-stream spacing, and sufficient space to arrange a fly hammer type deburring machine. However, a round billet continuous casting machine is generally arranged with multiple flows due to its compact arrangement and limited space. Therefore, a deburring machine is not designed. Since the continuous casting billet is round and the lower part of the adhered cutting nub area is arc-shaped, it is impossible to hit the cutting nub by the conventional fly hammer line type arrangement of the deburring machine. Therefore, it is impossible to remove the deburring and cutting nub.

[0006] Since the rolling of the continuous casting billet with the nub will seriously affect the yield rate of the steel, and even may cause damage to the rolling mill, in order to solve the above two problems, the cutting nub must be ground or cut off during the finishing process of the continuous casting billet.

[0007] Since the beginning of this century, there are roughly two kinds of ideas around the removal of cutting tumor, one is the scraper type cutting tumor removal machine, and the other is the fly hammer type, both of which are widely used in slab continuous casting and have achieved good use effect. However, for large-scale continuous casting round billets, the bottom shape of large-scale continuous casting round billets is complex, which leads to the complex residual situation of cutting tumor, so there is no suitable means for removing the cutting tumor on the large-scale continuous casting round billets. SUMMARY

[0008] (I) Technical problem

[0009] Therefore, how to solve the problem of low yield caused by the existence of cutting tumor on continuous casting billets has become a problem to be solved by the technical personnel in the field.

[0010] (II) Technical solution

[0011] In order to achieve the above purpose, the present application provides the following technical scheme:

[0012] The present application provides a fly hammer device suitable for removing cutting tumor of large-scale round billets, which is used to remove the cutting tumor on continuous casting billets.

[0013] In the present application, the fly hammer device suitable for removing cutting tumor of large-scale round billets comprises a fly hammer, one end of the fly hammer is provided with a limiting pin hole, and the end face of the other end of the fly hammer is a special-shaped face.

[0014] The special-shaped face is composed of a plurality of generatrices arranged along the hole axis direction of the limiting pin hole.

[0015] In the plane perpendicular to the hole axis of the limiting pin hole, the generatrix is a circular curve, the distance from the generatrix to the axis of the rotating main shaft is S, and the distance from the bottom surface of the continuous casting billet to the axis of the rotating main shaft is L, wherein S < L.

[0016] Preferably, in the fly hammer device suitable for removing cutting tumor of large-scale round billets provided by the present application, L-S = M, and the value range of M is 1-2mm.

[0017] Preferably, in the fly hammer device suitable for removing cutting tumor of large-scale round billets provided by the present application, along the hole axis direction of the limiting pin hole, the fly hammer is composed of a plurality of fly hammer units, the fly hammer unit is provided with a fly hammer unit hole, the fly hammer unit holes provided on all the fly hammer units are coaxially arranged and form the limiting pin hole, and all the fly hammer units are assembled on the same limiting pin.

[0018] Preferably, in the fly hammer device for removing cutting tumors of large-diameter round billets provided by the present application, the size of the fly hammer unit in the direction of the hole axis of the fly hammer unit hole is the thickness dimension, and the thickness of the fly hammer unit is between 20 mm and 24 mm.

[0019] Preferably, in the fly hammer device for removing cutting tumors of large-diameter round billets provided by the present application, bumping bosses are arranged at both ends of the fly hammer unit hole and protrude outward relative to the surface of the fly hammer unit.

[0020] Preferably, in the fly hammer device for removing cutting tumors of large-diameter round billets provided by the present application, the material of the fly hammer unit is 65Mn spring steel or T8A carbon tool steel; when the material of the fly hammer unit is 65Mn spring steel, the quenched and tempered hardness of the fly hammer unit is 61-63HRC; and when the material of the fly hammer unit is T8A carbon tool steel, the quenched and tempered hardness of the fly hammer unit is 63-65HRC.

[0021] Preferably, in the fly hammer device for removing cutting tumors of large-diameter round billets provided by the present application, the special-shaped surface is formed by wire cutting.

[0022] Preferably, in the fly hammer device for removing cutting tumors of large-diameter round billets provided by the present application, a limiting pin is connected through the limiting pin hole, the fly hammer is arranged on a rotating main shaft through the limiting pin, the rotating main shaft is connected with a power device through a shaft coupling, and the power device drives the fly hammer to rotate through the shaft coupling and the rotating main shaft.

[0023] Preferably, in the fly hammer device for removing cutting tumors of large-diameter round billets provided by the present application, a plurality of fly hammer units are arranged on the same limiting pin, the limiting pins are arranged in parallel and at intervals with respect to the rotating main shaft; a plurality of limiting pins are arranged to form a limiting pin group, along the axial direction of the rotating main shaft, from one end of the rotating main shaft to the other end, all the limiting pins in the same limiting pin group are arranged along a spiral line, and the fly hammer units arranged on each limiting pin can move independently; in the projection direction perpendicular to the rotating main shaft, the projections of all the fly hammer units in the same limiting pin group have no interval; a plurality of limiting pin groups are arranged, and all the limiting pin groups are arranged at equal intervals along the circumferential direction of the rotating main shaft; the two ends of the limiting pin are provided with a bracket plate, and the limiting pin is fixedly arranged on the rotating main shaft through the bracket plate.

[0024] Preferably, in the fly hammer device for removing cutting tumors of large-size round billets provided by the application, a plurality of fly hammer units are arranged on the same limiting pin, and the limiting pins are arranged in parallel and at intervals with the rotating main shaft; the limiting pins are arranged in multiple and form a limiting pin group, in the same limiting pin group, all the limiting pins are arranged coaxially, and the fly hammer units arranged on each limiting pin can move independently; the limiting pin groups are arranged in multiple, and all the limiting pin groups are arranged at equal intervals along the circumferential direction of the rotating main shaft; along the circumferential direction of the rotating main shaft, two adjacent limiting pin groups are arranged at intervals in the axial direction of the rotating main shaft, and in the projection direction perpendicular to the rotating main shaft, the projections of all the fly hammer units in the two adjacent limiting pin groups are without intervals; the two ends of the limiting pin are provided with a bracket plate, and the limiting pin is fixedly arranged on the rotating main shaft through the bracket plate.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the beneficial effects of the application are as follows:

[0027] The application provides a fly hammer device for removing cutting tumors of large-size round billets, which is used for removing cutting tumors on continuous casting round billets. Specifically, the fly hammer device for removing cutting tumors of large-size round billets comprises a fly hammer, one end of the fly hammer is provided with a limiting pin hole, and the end face of the other end of the fly hammer is a special-shaped face; the special-shaped face is composed of a plurality of generatrices arranged along the hole axis direction of the limiting pin hole; in the plane perpendicular to the hole axis of the limiting pin hole, the generatrix is a circular curve, the distance from the generatrix to the hole axis of the limiting pin hole is S, and the minimum distance from the continuous casting billet to the hole axis of the limiting pin hole is L, wherein S < L. The application is installed on a continuous casting billet delivery roller way, and during the continuous casting billet delivery process, the fly hammer hammering mode can be used to remove cutting tumors at the head end and the tail end of the continuous casting billet. Through the above structural design, the fly hammer rotation in the application can completely remove the cutting tumors without causing damage to the surface of the continuous casting billet. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application, serve to explain the application, and do not constitute an improper limitation on the application. Among them:

[0029] Figure 1 It is a structural schematic view of the fly hammer device for removing cutting tumors of large-size round billets in the embodiment of the application;

[0030] Figure 2 It is a partial structural schematic view of the fly hammer device for removing cutting tumors of large-size round billets in the embodiment of the application;

[0031] Figure 3aStructure schematic diagram of a flying hammer unit in an embodiment of the present application;

[0032] Figure 3b Structure schematic diagram of a flying hammer unit in another embodiment of the present application;

[0033] Figure 4 Size annotation schematic diagram of a flying hammer unit and a continuous casting billet in an embodiment of the present application;

[0034] Figure 5 Layout schematic diagram of a flying hammer in an unfolded state of an outer side surface of a rotating main shaft in an embodiment of the present application;

[0035] Figure 6 Layout schematic diagram of a flying hammer in an unfolded state of an outer side surface of a rotating main shaft in another embodiment of the present application;

[0036] Figure 7 Structure schematic diagram of a flying hammer in an embodiment of the present application;

[0037] Figure 8 Structure schematic diagram of a shelf plate arranged on a rotating main shaft in an embodiment of the present application.

[0038] In Figure 5 and Figure 6 , the dashed line coverage is a set of limit pins.

[0039] In Figures 1 to 8 , the correspondence between the component names and the reference signs is as follows:

[0040] 1, flange frame; 2, flying hammer; 3, rotating main shaft; 4, limit pin;

[0041] 5, coupling; 6, power equipment; 7, continuous casting billet; 8, limit pin hole; 9, special-shaped surface;

[0042] 10, shelf plate; 11, boss structure; 12, limit sleeve; 13, knocking head.

[0043] In Figure 3a , the generatrix constituting the top surface of the flying hammer unit is A;

[0044] In Figure 7 , the generatrix A is arranged by moving along the circular arc B;

[0045] In Figure 4 , point D is the axis of the rotating main shaft;

[0046] In Figure 3a and Figure 4 , the surface of the flying hammer used for colliding with the cutting tumor is the surface within the range of circle C. DETAILED DESCRIPTION

[0047] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. Various examples are provided by way of explanation of the present application but not to limit the present application. It will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For example, features shown or described as part of one embodiment can be used in another embodiment to create yet another embodiment. It is, therefore, desired that the present application include such modifications and variations as come within the scope of the appended claims and their equivalents.

[0048] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship shown in the drawings, and are used only for the purpose of facilitating the description of the present application and not to require the present application to be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be directly connected, or indirectly connected through intermediate components, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0049] Reference is made to Figures 1 to 8 , wherein, Figure 1 is a structural schematic diagram of a fly hammer device suitable for removing cutting tumors of large-size round billets in embodiments of the present application; Figure 2 is a partial structural schematic diagram of a fly hammer device suitable for removing cutting tumors of large-size round billets in embodiments of the present application; Figure 3a is a structural schematic diagram of a fly hammer unit in embodiments of the present application; Figure 3b is a structural schematic diagram of a fly hammer unit in another embodiment of the present application; Figure 4 is a size labeling schematic diagram of a fly hammer unit and a continuous casting billet in embodiments of the present application; Figure 5 is a layout schematic diagram of a fly hammer in an unfolded state of an outer side surface of a rotating main shaft in an embodiment of the present application; Figure 6 is a layout schematic diagram of a fly hammer in an unfolded state of an outer side surface of a rotating main shaft in another embodiment of the present application; Figure 7 is a structural schematic diagram of a fly hammer in an embodiment of the present application; Figure 8 is a structural schematic diagram of a fly hammer unit in an embodiment of the present application;

[0050] The fly hammer device suitable for removing cutting tumors of large-size round billets provided by the present application is a device suitable for removing cutting tumors on continuous casting billets (especially large-size round billets) in the continuous casting production process of a steelmaking plant in the steel industry, and belongs to the field of steelmaking continuous casting.

[0051] For large-size round billets, the trend towards larger billet sizes is becoming increasingly apparent in order to improve the quality of continuously cast billets. Large-size continuously cast billets can be directly processed into larger-size products, such as large-size rolled products, thicker plates, or larger-size steel pipes. They can also be used to obtain rolled products with higher internal quality and higher flaw detection quality by increasing the compression ratio. Under current technological conditions, square or rectangular billets with a single-sided length greater than 350mm or round billets with a diameter greater than 350mm are generally referred to as large-size billets. The large-size round billets referred to in this application specifically refer to this type of casting machine cross-sectional specification.

[0052] Specifically, the present invention provides a flying hammer device suitable for removing cutting burrs from large-sized round billets. The flying hammer device for removing cutting burrs from large-sized round billets includes a flying hammer 2. In the present invention, the flying hammer 2 has two structures: the first structure is an integral structure, and the second structure is composed of multiple unit blocks (flying hammer units).

[0053] In the second structural form, the flying hammer 2 consists of multiple flying hammer units mounted on the same limiting pin. When the flying hammer 2 is composed of multiple flying hammer units, the top curved surface shapes of the flying hammer units are different.

[0054] Please refer to Figure 7 , Figure 7 This is a simplified schematic diagram of the flying hammer structure in one embodiment of the present invention.

[0055] In this invention, one end face of the flying hammer 2 is defined as an irregularly shaped surface, specifically: the irregularly shaped surface is composed of multiple generatrices arranged along the axis of the limiting pin hole, wherein the generatrices are circular curves. The flying hammer device provided by this invention, suitable for removing cutting marks from large-sized round billets, is mainly applicable to the removal of cutting marks from round billets. A round billet is a circular steel billet. On a cross-section perpendicular to the axis of the round billet, the bottom surface of the round billet is an arc shape (an arc within the cross-section; for the round billet as a whole, the bottom surface of the round billet is an arc surface). Based on the shape characteristics of the bottom surface of the round billet, this invention has made the above-mentioned structural design on the end face of the flying hammer 2. When the flying hammer 2 is composed of multiple flying hammer units, the top surface of the flying hammer unit (the end face used to remove cutting marks) also follows the design principle of the top surface of the flying hammer 2.

[0056] by Figure 7 For example, in the first flying hammer unit on the left, the top surface of this flying hammer unit is formed by multiple identical (same curvature) generatrices A (circular arcs) arranged from left to right (along the axis of the limiting pin hole). During the arrangement of generatrices A from left to right, they move along an arc B parallel to the bottom surface of the blank. The top surface design of the second flying hammer unit on the left and other flying hammer units is the same as that of the first flying hammer unit.

[0057] The fly hammer unit adopts a plate structure design, and the overall fly hammer unit is approximately a rectangular structure, which has certain thickness, width and length dimensions. Along the length direction of the fly hammer unit, one end of the fly hammer 2 is provided with a limiting pin hole 8 (the limiting pin hole 8 penetrates through the entire fly hammer unit in the thickness direction of the fly hammer unit), and the end face of the other end of the fly hammer 2 is a special-shaped face 9.

[0058] Preferably, the limiting pin hole is a circular hole (a round hole), and the circular limiting pin hole can be provided with a high-strength limiting pin to meet the requirements of the circumferential rotation and impact of the fly hammer 2.

[0059] In order to ensure that the fly hammer unit does not interfere with each other due to wear and processing quality problems during rotation, a certain boss is designed at the position of the perforated part (the limiting pin hole 8) of the fly hammer unit. In an embodiment of the present application, when multiple fly hammer units are installed on the same limiting pin, in order to avoid the mutual influence between the fly hammer units (if both sides of the fly hammer unit are flat, the adjacent two fly hammer units are in face-to-face contact, so that a large friction force is generated between the fly hammer units, thereby affecting the movement of the fly hammer unit), a boss structure 11 (the boss structure 11 is 1mm-3mm higher than the side of the fly hammer unit) is arranged on the side (which can be arranged on one side or both sides) of the fly hammer unit and corresponds to the position of the limiting pin hole 8. Thus, due to the arrangement of the boss structure 11, the mutual influence between the adjacent two fly hammer units can be avoided.

[0060] As shown in FIG. 3, another structure of the fly hammer unit in the present application is shown. Figure 3b

[0061] The fly hammer unit includes a plate structure main body (a cuboid structure having certain height, width and thickness), a knocking head 13 structure is arranged at one end (the upper end of the main body) of the main body (the length direction of the main body), Figure 3b and the structure design of the top surface of the knocking head (the end surface for removing the cutting tumor) also follows the design principle of the top surface of the fly hammer 2, which will not be described here. The width dimension of the knocking head 13 is smaller than the width of the main body, and the thickness dimension of the knocking head 13 is equal to the thickness of the main body. The size of the knocking head 13 is reduced (slightly smaller), which can effectively reduce the processing area of the top surface of the knocking head and improve the operation efficiency of the fly hammer unit processing and forming. The limiting pin hole 8 is arranged on the main body, and the limiting pin hole 8 is an oval hole (a long straight hole). The limiting pin can be designed according to the shape of the limiting pin hole 8, and a non-circular hole assembly method is adopted, so that the fly hammer unit can be fixedly installed (no longer rotates relative to the limiting pin) on the limiting pin.

[0062] ​Specifically, in the hole axis direction of the limiting pin hole 8, the fly hammer 2 is composed of multiple fly hammer units arranged side by side, and the fly hammer unit holes are arranged on the fly hammer units, and the fly hammer unit holes arranged on all the fly hammer units are coaxial and form the limiting pin hole 8 (in the present application, the fly hammer 2 is composed of multiple fly hammer units, the fly hammer unit holes are arranged on the fly hammer units, and the fly hammer unit holes are arranged on the fly hammer units. The fly hammer unit holes can form a through hole structure, that is, the limiting pin hole 8). The limiting pin is arranged through the fly hammer unit hole, and all the fly hammer units are assembled on the same limiting pin.

[0063] Of course, in another embodiment of the present application, the fly hammer 2 can adopt an integrated structure, and the limiting pin hole 8 is a through hole structure arranged on the fly hammer 2.

[0064] In the present application, the end face of the other end (the other end in the length direction) of the fly hammer 2 is a special-shaped face 9, and when the fly hammer 2 is composed of multiple fly hammer units, the end face of each fly hammer unit (the end face of the end away from the fly hammer unit hole in the length direction of the fly hammer unit) constitutes the special-shaped face 9 of the fly hammer 2.

[0065] Further, the size of the fly hammer unit in the hole axis direction of the fly hammer unit hole is the thickness dimension, and the thickness of the fly hammer unit is between 20 mm and 24 mm.

[0066] The present application is mainly applicable to large-size round billets, and especially for large-size round billets, the arc length of the cutting tumor actually accumulated to the arc bottom (the arc length occupied by the cutting tumor) is generally not more than 30% of the arc length (the arc length of the bottom of the round billet). Therefore, in order to achieve better hitting effect, the thickness of the fly hammer cannot be designed too large, otherwise the arc-shaped part itself will affect and hinder the circumferential movement of the fly hammer. In order to ensure sufficient impact force of the fly hammer, the thickness of the fly hammer unit is preferably designed to be 20 mm-24 m, and one fly hammer can be provided with 3-5 fly hammer units.

[0067] In the present application, after multiple fly hammer units are assembled on the same limiting pin, in order to avoid the friction or collision between the adjacent two fly hammer units when the limiting pin rotates, the anti-collision boss protruding outward relative to the surface of the fly hammer unit is arranged at both ends of the fly hammer unit hole. After the anti-collision boss is arranged, the anti-collision bosses on the adjacent two fly hammer units abut, so that a certain gap is formed between the adjacent two fly hammer units, thereby avoiding the friction or collision of the fly hammer units.

[0068] For the convenience of the structural description of the special-shaped surface 9, the present application takes the fly hammer 2 with an integrated structure as an example for illustration: the special-shaped surface 9 is composed of a plurality of generatrices arranged along the hole axis direction of the limiting pin hole 8, in the plane perpendicular to the hole axis of the limiting pin hole 8, the generatrix is a circular curve (with the axis of the rotating main shaft as the center), the distance from the generatrix to the axis of the rotating main shaft is S, and the minimum distance from the continuously-cast billet 7 to the axis of the rotating main shaft is L, wherein S < L, specifically, L-S = M, and the value range of M is 1-2 mm, and the optimal value of M is 1 mm. The above-mentioned S and L are all point values taken in the same cross section perpendicular to the axis of the rotating main shaft.

[0069] In the present application, the manufacturing material of the fly hammer unit is 65Mn spring steel or T8A carbon tool steel.

[0070] Further, when the manufacturing material of the fly hammer unit is 65Mn spring steel, the quenching and tempering hardness of the fly hammer unit is 61-63HRC; and when the manufacturing material of the fly hammer unit is T8A carbon tool steel, the quenching and tempering hardness of the fly hammer unit is 63-65HRC.

[0071] Generally, the hardness of the fly hammer 2 after heat treatment is much higher than that of the work object (cutting tumor), and the material selection of the fly hammer is based on two principles: 1. Selecting high-carbon steel to facilitate obtaining higher hardness after quenching and tempering; 2. Selecting spring steel material to obtain higher strength. The above hardness value selection is based on the conventional heat treatment performance of such materials, and is also the best data for the matching of strength, impact and hardness. According to the differences of the steel grades of the casting machine, the service life of the fly hammer with different materials may vary.

[0072] In a specific embodiment of the present application, the special-shaped surface 9 is formed by wire cutting. Of course, the fly hammer unit can also be formed by casting, that is, directly formed in a mold, and the size precision of the special-shaped surface 9 can be improved by polishing after casting.

[0073] The limiting pin passes through the limiting pin hole 8 and is connected with the fly hammer 2 (fly hammer unit), the limiting pin is connected with the power equipment 6 through the shaft coupling 5, and the power equipment 6 drives the rotating main shaft to drive the fly hammer 2 to rotate through the shaft coupling 5. Specifically, the power equipment 6 can be an electric motor.

[0074] The fly hammer device provided by the present application is a device suitable for removing large-size round billet cutting tumors, and is particularly suitable for the removal of cutting tumors on the round continuously-cast billet 7.

[0075] The flame cutting operation of the continuously-cast billet 7 is generally carried out from top to bottom (the continuously-cast billet 7 can be roughly regarded as being conveyed in the horizontal direction), and liquid cutting steel liquid is inevitably generated during the cutting process, which flows downward under the action of gravity and cools to form a cutting tumor at the bottom edge of the cutting section.

[0076] The flying hammer device provided by this invention is a device capable of effectively removing cutting defects. In the flying hammer device provided by this invention, the flying hammer 2 is driven to rotate by an external power device 6. After the flying hammer 2 comes into contact with the cutting defects on the continuously cast billet 7, it applies an impact force to the cutting defects, thereby washing away the cutting defects through the impact force.

[0077] Specifically, a hole structure (i.e., a limit pin hole) will be opened on the flying hammer 2, and a limit pin 4 will be installed on the limit pin hole of the flying hammer 2. The limit pin 4 (the limit pin 4 is installed on the rotating spindle, and the rotating spindle is connected to the external power equipment 6 through the coupling 5, and the external power equipment 6 drives the rotating spindle to rotate) thereby driving the flying hammer 2 to rotate.

[0078] The specific removal process of the cutting edge on the continuous casting billet 7 by the flying hammer 2 is as follows: First, the flying hammer 2 will impact the cutting edge, and the cutting edge will break with the continuous casting billet 7 under the impact of the flying hammer 2. Then, the flying hammer 2 continues to rotate, and the end face (top end face) of the flying hammer 2 will contact the surface of the continuous casting billet 7 (the surface part close to the cutting edge). Through friction with the surface of the continuous casting billet 7, the cutting edge or the broken wall of the cutting edge is further removed.

[0079] Based on the above-described process of the flying hammer 2 removing the cutting edge, the structural design of the flying hammer 2 in this invention should ensure the following two points: 1. The surface of the flying hammer 2 used to impact the cutting edge (the side surface of the flying hammer 2, on...) Figure 3a as well as Figure 4 1. The surface within the area of ​​circle C should be as flat as possible, as a flat surface has stronger impact resistance and a longer service life for the hammer 2; 2. During the rotation of the hammer 2, the distance between the end face of the hammer 2 (the end face of one end along the length of the hammer 2) and the outer surface of the continuously cast billet 7 should remain consistent. Based on the above two structural design requirements, especially for the second point, the present invention proposes the following solution: The end face of the hammer 2 adopts a smooth curved surface structure design. For ease of structural description, the end face of the hammer 2 is set to be composed of countless points, and several points are connected to form a line to form a generatrix. The generatrix is ​​then arranged in a certain way (i.e., it moves along an arc line B parallel to the bottom surface of the billet) to form a surface (i.e., the end face of the hammer 2).

[0080] In the application, the flying hammer keeps rotating around the rotating main shaft during the operation (i.e. the process of removing the cutting tumor). Specifically, the flying hammer is installed on the rotating main shaft through the limiting pin, and under the action of the centrifugal force, the connecting line between the outer end surface (the center point of the outer end surface) of the flying hammer and the limiting pin hole (the center point of the limiting pin hole) on the flying hammer passes through the axis of the rotating main shaft. The structure design of the busbar in the application is based on the axis of the rotating main shaft, and the limiting pin hole is arranged on the flying hammer 2, the flying hammer 2 is installed on the limiting pin 4 through the limiting pin hole, and the flying hammer 2 is driven to rotate by the limiting pin 4. During the operation, the flying hammer rotates a certain angle on the limiting pin 4 under the action of the centrifugal force (at this time, the pulling force of the limiting pin 4 on the flying hammer and the centrifugal force on the flying hammer are on a straight line), and the flying hammer keeps the posture unchanged relative to the limiting pin 4, the flying hammer is installed on the rotating main shaft by the limiting pin 4, and if the rotating main shaft keeps rotating at a constant speed, the flying hammer 2 will keep the fixed posture and rotate around the rotating main shaft. The rotating main shaft is arranged horizontally, and the distance between each point on the bottom surface of the round blank and the rotating main shaft keeps unchanged during the movement of the round blank along the horizontal straight line. Therefore, when the rotating main shaft drives the flying hammer 2 to rotate, in order to avoid the fluctuation of the interval between the top surface of the flying hammer 2 and the bottom surface of the round blank (if the interval fluctuates, the flying hammer 2 may hit the surface of the round blank, which should be avoided in actual production operation), the top surface of the flying hammer 2 is designed (i.e. composed of the circular arc busbar), so that the distance between each point on the top surface of the flying hammer 2 and the axis of the rotating main shaft keeps unchanged when the flying hammer 2 rotates, and thus the interval between the top surface of the flying hammer 2 and the bottom surface of the round blank can be kept unchanged. Based on the structure design, when the cutting tumor exists on the bottom surface of the round blank, the flying hammer 2 rotates and the round blank moves linearly, so that the flying hammer 2 can be equivalent to keep a certain interval and roll on the round blank at a high speed, and then if the flying hammer 2 encounters the cutting tumor during the rotation, the cutting tumor will exert a force to hammer or crush the cutting tumor.

[0081] Under the stable rotating state of the rotating main shaft (i.e. the rotating main shaft rotates at a constant speed), the flying hammer 2 will be subjected to the gravity, the centrifugal force and the pulling force of the limiting pin 4, at this time, the gravity can be ignored (the gravity is small, and the influence of the gravity on the rotating state of the flying hammer 2 is small, so the gravity can be ignored), then the pulling force and the centrifugal force change the posture of the flying hammer 2 (i.e. change a certain angle) until the pulling force and the centrifugal force are equal in size, opposite in direction and located on a straight line.

[0082] A plane perpendicular to the axis of the rotating main shaft is set as a reference surface, in the reference surface, the axis of the rotating main shaft is equivalent to a point, and a line cut by the reference surface and the end surface of the flying hammer 2 is the busbar. In the same reference surface, the axis of the rotating main shaft is equivalent to a point, and a line cut by the reference surface and the end surface of the flying hammer 2 is the busbar. Figure 4The relationship between the point D in the figure and the generatrix A is that the distance from each point on the generatrix A to the axis of the rotating main shaft (point D) is the same, that is, in the reference plane, the generatrix A is a circular arc curve with the axis of the rotating main shaft (point D) as the center. Of course, the generatrix can also be a circular arc curve with a curvature greater than that of the above-mentioned generatrix (that is, the line on which each point on the generatrix A is the same distance from the axis of the rotating main shaft).

[0083] Since the rotating main shaft is fixedly arranged (rotatable) relative to the ground, the flying hammer 2 can maintain a relatively fixed state with the rotating main shaft during operation under the action of centrifugal force. During the movement of the continuously cast billet 7, the distance between the continuously cast billet 7 and the ground remains unchanged, that is, the distance relative to the rotating main shaft remains unchanged, and further, the distance relative to the end face of the flying hammer 2 (when the flying hammer 2 is in the highest rotating position) remains unchanged. For the generatrix, a reference plane is set, which passes through the axis of the rotating main shaft 3 and is perpendicular to the axis of the round billet. When the flying hammer 2 rotates, the distance from the intersection of each point on the generatrix with the reference plane to the surface of the continuously cast billet 7 will be a constant value.

[0084] After the generatrix is structurally designed (that is, the distance from each point on the generatrix A to the axis of the rotating main shaft is the same), the arrangement of each generatrix needs to be designed in the direction of the hole axis of the limiting pin hole (that is, the generatrix A moves along a circular arc line B parallel to the bottom surface of the round billet), thereby forming a complete end face.

[0085] The present application mainly aims at cutting and removing tumors for round billets. In the reference plane, the minimum distance from the continuously cast billet 7 to the rotating center of the flying hammer (that is, the axis of the rotating main shaft) is set as L. Therefore, the distance S from each point on the above-mentioned generatrix to the rotating center of the flying hammer (the axis of the rotating main shaft) should not be greater than L, so as to ensure that the flying hammer 2 completely contacts the impurities (cutting tumors) on the surface of the continuously cast billet 7, thereby effectively removing the cutting tumors. Further, in the present application, S-L=M, and the value range of M is 1mm-2mm, with 1mm as the optimal value.

[0086] Through the design of the installation position of the limiting pin 4 and the structural size of the flying hammer 2, it can be ensured that for the same type of continuously cast billet 7, the flying hammer 2 can collide with the protruding impurities (mainly cutting tumors) on the surface of the continuously cast billet 7 during rotation without causing excessive friction damage to the surface of the continuously cast billet 7.

[0087] The specific structure of the present application includes a flange frame 1, a rotating main shaft 3 is installed on the flange structure through bearings, so that the rotating main shaft 3 can be lifted in the height direction, the flying hammer 2 is installed on the rotating main shaft 3 through the limiting pin 4, and the rotating main shaft 3 is connected with the external power equipment 6 through the shaft coupling 5 to realize power connection.

[0088] The present application uses the fly hammer 2 to remove the cutting tumor, the rotating main shaft 3 is driven to rotate by the external power equipment 6, the fly hammer 2 is installed on the rotating main shaft 3 through the limiting pin, the rotating main shaft 3 can be driven to rotate at high speed by the external power equipment 6, and the fly hammer 2 is driven to rotate by the rotating main shaft 3. The present application is installed on the blanking roller way, when the continuous casting blank 7 runs to the working position, the detection is carried out through the photoelectric switch, after the continuous casting blank 7 runs to the position, the continuous casting blank 7 stays at the set position, the main shaft rises and drives the fly hammer 2 to rise to the highest position (after the fly hammer 2 rotates, the special-shaped surface 9 of the fly hammer 2 can contact the cutting tumor remaining on the bottom surface of the continuous casting blank 7), the fly hammer 2 is driven to rotate and impact the cutting tumor part of the continuous casting blank 7 under the drive of the motor, the cutting tumor is removed through the circumferential mechanical force (the fly hammer 2 is in rotating motion in the working process, and the above-mentioned circumferential direction refers to the rotating direction of the fly hammer 2), and the purpose of removing the cutting tumor is achieved. After the operation is completed, the main shaft is lowered, and the continuous casting blank 7 resumes advancing. When the continuous casting blank 7 runs to the tail sensing position, the above-mentioned removing action is repeated, so that the head and tail of the continuous casting blank 7 can be treated.

[0089] In the present application, the fly hammer 2 is composed of a plurality of fly hammer units, the fly hammer unit is made of 65Mn or T8A, and the end face of the fly hammer unit is quenched and tempered after being cut to the designed size by wire cutting. The above-mentioned two materials are selected to ensure that the fly hammer unit has sufficient strength and hardness, and has good elasticity and toughness, thereby prolonging the service life after mechanical impact. Specifically, the quenched and tempered hardness of 65Mn is 61-63HRC, and the quenched and tempered hardness of T8A is 63-65HRC. The tail end of the fly hammer unit is flush through the limiting pin 4, the working end (one end of the special-shaped surface 9) is processed by wire cutting into a structure that matches the shape of the bottom surface of the continuous casting blank 7, and the length of the fly hammer 2 is ensured to be slightly higher than the lower arc by 1-2mm.

[0090] The present application provides a fly hammer device suitable for removing the cutting tumor of a large-size round blank, which is used for removing the cutting tumor on the continuous casting blank 7. Specifically, the fly hammer device suitable for removing the cutting tumor of a large-size round blank comprises a fly hammer 2, one end of the fly hammer 2 is provided with a limiting pin hole 8, and the end face of the other end of the fly hammer 2 is a special-shaped surface 9; the special-shaped surface 9 is composed of a plurality of generatrices arranged along the hole axis direction of the limiting pin hole 8; in the plane perpendicular to the hole axis of the limiting pin hole 8, the generatrix is a circular curve, the distance from the generatrix to the hole axis of the limiting pin hole 8 is S, and the minimum distance from the continuous casting blank 7 to the hole axis of the limiting pin hole 8 is L, wherein S

[0091] Please refer to Figure 5 and Figure 6 , wherein,Figure 5 A schematic diagram of the layout of the fly hammer in the unfolded state of the outer side of the rotating main shaft in one embodiment of the present application; Figure 6 A schematic diagram of the layout of the fly hammer in the unfolded state of the outer side of the rotating main shaft in another embodiment of the present application.

[0092] In the present application, the fly hammer is installed on the rotating main shaft 3 through the limiting pin 4, and the rotating main shaft 3 drives the fly hammer to rotate through the limiting pin 4. The layout of the fly hammer on the rotating main shaft 3 is as follows:

[0093] Method one,

[0094] Corresponding Figure 5 , a plurality of fly hammer units are arranged on the same limiting pin 4, and the layout of the fly hammer on the rotating main shaft 3 can be equivalent to the layout of the limiting pin on the rotating main shaft 3, so the present application takes the limiting pin 4 as an example.

[0095] The limiting pin 4 is arranged in parallel and spaced apart from the rotating main shaft 3 (the axis of the limiting pin 4 is parallel to the axis of the rotating main shaft 3, and the limiting pin 4 is arranged away from the rotating main shaft 3), and the limiting pin 4 is provided with a plurality of limiting pins and forms a limiting pin group (a same limiting pin group contains a plurality of limiting pins 4).

[0096] Please refer to Figure 8 In the present application, the fly hammer 2 is installed on the rotating main shaft 3 through the limiting pin 4. The limiting pin 4 is installed on the rotating main shaft 3 through the shelf plate 10. In the present embodiment, the shelf plate 10 is a single-turn spiral plate structure, that is, the shelf plate 10 only rotates one turn around the rotating main shaft 3 and spirally rises or spirally descends along the axial direction of the rotating main shaft 3. A plurality of shelf plates 10 are arranged at equal intervals on the same rotating main shaft 3, and the spiral directions of all the shelf plates 10 are the same, that is, all spirally rise along the axial direction of the rotating main shaft 3 or all spirally descend along the axial direction of the rotating main shaft 3. From the actual product, the shelf plate 10 is equivalent to a ring-shaped spring gasket with a certain thickness (the middle of the ring is broken, and the two ends of the broken part are staggered front and back). The shelf plate 10 is a single-turn spiral plate structure, and on the rotating main shaft 3, the two ends of the shelf plate 10 are staggered along the axial direction of the rotating main shaft 3. In order to facilitate the description of the structure, the part where the two ends of the shelf plate are staggered is named as the shelf plate staggered part. A plurality of shelf plates 10 are arranged at equal intervals on the rotating main shaft 3 and extend from one end of the rotating main shaft 3 to the other end. Among all the shelf plates 10, the shelf plate staggered part rotates in the same direction on the rotating main shaft 3, and the phase difference angle between adjacent two shelf plates 10 is 15°-45°, which can be 15°, 20°, 25°, 30°, 35°, 40°, 45°, and 30° is the optimal angle.

[0097] After the shelf plates are arranged on the rotating main shaft 3 according to the above structural design, the shelf plates 10 are punched in the direction parallel to the rotating main shaft 3 to form shelf plate holes for mounting the limiting pins 4. In the present application, the limiting pins 4 can be long shaft pin structures, that is, one limiting pin 4 penetrates through multiple shelf plates 10, or short shaft pin structures, that is, one limiting pin 4 is only mounted between two adjacent shelf plates 10. When the limiting pins 4 adopt the long shaft pin structure, it is convenient to install the limiting pins 4, that is, the limiting pins 4 are inserted into the first shelf plate 10 from one end of the rotating main shaft 3 and then are inserted out of the last shelf plate 10 from the other end of the rotating main shaft 3. When the limiting pins 4 adopt the short shaft pin structure, the difficulty and cost of manufacturing the limiting pins 4 are relatively low.

[0098] The limiting pins 4 are mounted on the shelf plates 10 through the shelf plate holes arranged on the shelf plates 10 in the circumferential direction of the rotating main shaft 3. Multiple shelf plate holes are arranged at equal intervals on the same shelf plate 10, and the interval between two adjacent limiting pins 4 mounted on the same shelf plate 10 is designed according to the length of the fly hammers 2 (which can also be understood as fly hammer units), that is, the fly hammer 2 mounted on the present limiting pin does not contact the front limiting pin or the rear limiting pin in the non-rotating state (the fly hammer 2 falls down and abuts on the outer side surface of the rotating main shaft 3), so that the mutual interference between the fly hammers 2 can be avoided.

[0099] As can be seen from the above, the shelf plates 10 have a certain thickness, and the shelf plates 10 are single-turn spiral plate structures, so that the fly hammers 2 arranged between two adjacent shelf plates 10 can have the following situation: the fly hammer mounted on the limiting pin closest to the adjacent shelf plate 10 end face in the non-rotating state (the fly hammer 2 falls down and abuts on the outer side surface of the rotating main shaft 3) is affected by the end portion of the shelf plate 10 (which can also be understood as the fly hammer hitting the end portion of the shelf plate 10), so that the rotation of the rotating main shaft is disturbed (the rotating main shaft as a whole, including the limiting pins and the fly hammers, has a center of gravity not on the rotation center, causing the rotating main shaft to rotate and sway). In order to avoid the above situation, the present application provides a limiting sleeve 12 arranged on the shaft segment of the limiting pin opposite to the end portion of the shelf plate 10, that is, the limiting sleeve 12 is arranged opposite to the end portion of the shelf plate 10 in the circumferential direction of the rotating main shaft (the position opposite to the end portion of the shelf plate 10 is not provided with a fly hammer or a fly hammer unit), so that the fly hammer hitting the shelf plate 10 will not occur. For example, in Figure 5 the first row from top to bottom (the first row is r1 and the second row is r2), and the second column from left to right (the second column is c2 and the third column is c3), the two fly hammer units marked with shadows can be understood as being opposite to the end face of the shelf plate 10 below (since Figure 5 it is a simple diagram, only an example is shown), when two adjacent limiting pins in the circumferential direction are very close, the two fly hammer units marked with shadows will hit the shelf plate 10. In order to avoid this situation, the two fly hammer units marked with shadows will be replaced by limiting sleeves.

[0100] In the present application, the structure and relationship between the shelf plate 10, the limit pin and the fly hammer are designed as above, and no further description is given to a specific arrangement.

[0101] Along the axial direction of the rotating main shaft 3, from one end of the rotating main shaft 3 to the other end, all limit pins 4 in the same limit pin group are arranged along a spiral line (at least one revolution around the rotating main shaft 3, and one revolution is the optimal arrangement).

[0102] In the projection direction perpendicular to the rotating main shaft 3, in the same limit pin group, the projections of all fly hammer units are without gaps, which can ensure that the fly hammer units are arranged without gaps in the axial direction of the rotating main shaft 3, and the situation of cutting tumor missing will not occur.

[0103] The above is the arrangement of a limit pin group, in order to ensure the cutting tumor removal effect, the present application provides multiple limit pin groups, and all limit pin groups are arranged at equal intervals along the circumferential direction of the rotating main shaft 3.

[0104] The limit pin 4 is arranged on the rotating main shaft 3 and can be fixed relative to the rotating main shaft 3, specifically, the two ends of the limit pin 4 are provided with a shelf plate 10, the shelf plate 10 is fixed on the rotating main shaft 3, and the limit pin 4 is fixed on the rotating main shaft 3 through the shelf plate 10.

[0105] Method two,

[0106] Corresponding Figure 6 Similarly, multiple fly hammer units are arranged on the same limit pin 4, and the limit pin 4 is arranged in parallel with the rotating main shaft 3.

[0107] The limit pin 4 is arranged in multiple and forms a limit pin group, in the same limit pin group, all limit pins 4 are arranged coaxially (i.e. arranged along the axis of the rotating main shaft 3), and the fly hammer units arranged on each limit pin 4 can move independently.

[0108] The limit pin group is arranged in multiple, and all limit pin groups are arranged at equal intervals along the circumferential direction of the rotating main shaft 3; along the circumferential direction of the rotating main shaft 3, the two adjacent limit pin groups are arranged in staggered manner in the axial direction of the rotating main shaft 3. In this way, it can be ensured that in the projection direction perpendicular to the rotating main shaft 3, the projections of all fly hammer units in the two adjacent limit pin groups are without gaps, which can ensure that the fly hammer units are arranged without gaps in the axial direction of the rotating main shaft 3, and the situation of cutting tumor missing will not occur.

[0109] The limit pin 4 is arranged on the rotating main shaft 3 and can be fixed relative to the rotating main shaft 3, specifically, the two ends of the limit pin 4 are provided with a shelf plate 10, the shelf plate 10 is fixed on the rotating main shaft 3, and the limit pin 4 is fixed on the rotating main shaft 3 through the shelf plate 10.

[0110] The above merely provides the preferred embodiments of the present application, and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of protection of the present application.

Claims

1. A flying hammer device suitable for removing large-diameter round billet cutting tumors, for realizing the removal of cutting tumors on continuous casting billets, characterized in that, comprising a flying hammer, one end of the flying hammer is provided with a limiting pin hole, the end face of the other end of the flying hammer is a special-shaped surface; the special-shaped surface is composed of a plurality of generatrices arranged along the hole axis direction of the limiting pin hole; in the plane perpendicular to the hole axis of the limiting pin hole, the generatrix is a circular curve, the distance from the generatrix to the axis of the rotating main shaft is S, and the distance from the bottom surface of the continuous casting billet to the axis of the rotating main shaft is L, wherein S < L; a limiting pin is connected through the limiting pin hole, a plurality of flying hammer units are provided on the same limiting pin, the limiting pins are arranged in parallel and are spaced apart from the rotating main shaft; the limiting pins are provided in multiple and form a limiting pin group, along the axial direction of the rotating main shaft, from one end of the rotating main shaft to the other end, all the limiting pins in the same limiting pin group are arranged along a spiral line, and the flying hammer units provided on each limiting pin can move independently; in the projection direction perpendicular to the rotating main shaft, the projections of all the flying hammer units in the same limiting pin group are without interval; the limiting pin group is provided in multiple, and all the limiting pin groups are arranged equidistantly along the circumferential direction of the rotating main shaft; both ends of the limiting pin are provided with a bracket, and the limiting pin is fixedly arranged on the rotating main shaft through the bracket; the limiting pin is installed on the rotating main shaft through the bracket, the bracket is a single-turn spiral plate structure, the bracket rotates only one turn around the rotating main shaft and spirally rises or spirally descends along the axial direction of the rotating main shaft, a plurality of brackets are arranged equidistantly on the same rotating main shaft, and the spiral directions of all the brackets are the same; all the brackets spirally rise along the axial direction of the rotating main shaft, or all the brackets spirally descend along the axial direction of the rotating main shaft; a bracket hole is arranged on the bracket in the circumferential direction of the rotating main shaft, and the limiting pin is installed on the bracket through the bracket hole.

2. The flying hammer device suitable for removing large-diameter round billet cutting tumors according to claim 1, characterized in that, L-S = M, and the value range of M is 1-2 mm.

3. The flying hammer device suitable for removing large-diameter round billet cutting tumors according to claim 1, characterized in that, along the hole axis direction of the limiting pin hole, the flying hammer is composed of a plurality of flying hammer units, the flying hammer unit is provided with a flying hammer unit hole, and the flying hammer unit holes provided on all the flying hammer units are coaxially arranged and form the limiting pin hole; all the flying hammer units are assembled on the same limiting pin.

4. The flying hammer device suitable for removing large-diameter round billet cutting tumors according to claim 3, characterized in that, the size of the flying hammer unit in the hole axis direction of the flying hammer unit hole is the thickness dimension thereof, and the thickness of the flying hammer unit is between 20 mm and 24 mm.

5. The flying hammer device suitable for removing large-diameter round billet cutting tumors according to claim 3, characterized in that, anti-collision bosses protruding outward relative to the surface of the flying hammer unit are arranged at both ends of the flying hammer unit hole. ​ 6. The fly hammer device for removing cutting tumors of large-size round billets according to claim 3, wherein the fly hammer unit is made of 65Mn spring steel or T8A carbon tool steel. When the fly hammer unit is made of 65Mn spring steel, the quenching and tempering hardness of the fly hammer unit is 61-63HRC. When the fly hammer unit is made of T8A carbon tool steel, the quenching and tempering hardness of the fly hammer unit is 63-65HRC.

7. The fly hammer device for removing cutting tumors of large-size round billets according to claim 1, wherein the special-shaped surface is formed by wire cutting.

8. The fly hammer device for removing cutting tumors of large-size round billets according to any one of claims 3 to 7, wherein the fly hammer is arranged on a rotating main shaft through the limiting pin, the rotating main shaft is connected with a power device through a coupling, and the power device drives the fly hammer to rotate through the coupling and the rotating main shaft. ​ ​ ​

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