Blank plate forming device with dovetail groove and lamp pole forming device with dovetail groove

Abstract

The forming device comprises a rectangular groove forming roller set, a dovetail groove forming roller set and a shape righting roller set which are sequentially arranged in the advancing direction of a blank plate, and the rectangular groove forming roller set is used for forming a rectangular groove in the blank plate in a rolling mode; the dovetail groove forming roller sets roll the rectangular groove to form a dovetail groove, and the dovetail groove forming roller sets comprise the left dovetail groove forming roller set used for forming the left groove wall of the dovetail groove and the right dovetail groove forming roller set used for forming the right groove wall of the dovetail groove. The left groove wall forming roller set and the right groove wall forming roller set each comprise a first forming roller and a second forming roller, and an included angle alpha is formed between the cross section of each first forming roller and the vertical plane. The forming efficiency of the dovetail groove can be improved, and the forming quality of the dovetail groove is ensured. The invention further provides a lamp pole forming device with the dovetail groove, the forming efficiency of the lamp pole dovetail groove can be improved, and the forming quality of the dovetail groove is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of lamp post processing, and particularly relates to a blank plate forming device with a dovetail groove and a lamp post forming device with a dovetail groove. Background Art

[0002] Existing lamp posts are basically hollow tubes with a substantially uniform wall thickness. Lamp posts include those with exactly the same cross-sectional shape and size, as well as tapered lamp posts with the same cross-sectional shape but whose size varies uniformly from one end to the other. There are also combined lamp posts composed of multiple sections of lamp posts. Such combined lamp posts are formed by combining at least two sections of lamp posts. Each section of lamp post has a cross-section with the same shape, but the cross-sectional shapes of the various sections of lamp posts are not the same or the cross-sectional dimensions are not gradually changing.

[0003] To increase the strength of the lamp post or form decorative lines, sometimes grooves are machined on the lamp post along its axial direction. For example, V-shaped grooves or rectangular grooves can be directly formed by stamping or bending. In order to reliably install other functional components on the lamp post, some lamp posts are designed with dovetail grooves generally arranged along its axial direction. Moreover, for lamp posts at intersections, when it is necessary to indicate road information in four directions of east, west, south, and north, a quadrangular lamp post with dovetail grooves on all four sides is required to install road signs or other loads on the four sides of the lamp post. Due to the limitation of its shape, the dovetail groove cannot be directly formed by stamping or bending. If a dovetail groove is machined on a lamp post with exactly the same cross-sectional shape and size, a drawing method can be used for processing, that is, after heating a round tube or a square tube, it is drawn to form an installation groove in the shape of a dovetail groove. However, when this processing method is used for processing thicker pipes, cracks are likely to appear inside the dovetail groove, and since the end of the pipe needs to be clamped and subjected to tensile force during drawing, the end of the drawn pipe will be severely deformed. In the further processing of the pipe, the severely deformed part needs to be cut off, reducing the material utilization rate. Summary of the Invention

[0004] The present invention provides a blank plate forming device with a dovetail groove, which can ensure the forming quality of the dovetail groove on the blank plate; on this basis, the present invention also provides a lamp post forming device with a dovetail groove to jointly solve the technical problem of forming a dovetail groove on a tapered lamp post.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A blank plate forming device with a dovetail groove, comprising a rectangular groove forming roller set and a dovetail groove forming roller set arranged in sequence along the advancing direction of the blank plate. The rectangular groove forming roller set is used to roll and form a rectangular groove on the blank plate; the dovetail groove forming roller set rolls and forms the rectangular groove into a dovetail groove. The dovetail groove forming roller set includes a left dovetail groove forming roller set for forming the left side wall of the dovetail groove and a right dovetail groove forming roller set for forming the right side wall of the dovetail groove. Both the left side wall forming roller set and the right side wall forming roller set include a first forming roller and a second forming roller. The cross-section of the first forming roller has an angle α with the vertical plane, and the angle between the cross-section of the second forming roller and the vertical plane is the same as the angle between the cross-section of the first forming roller and the vertical plane; between any two adjacent rolling passes for forming the left or right side wall, there is a set of leveling and straightening roller sets to level and straighten the bottom and two wings of the dovetail groove; the blank plate forming device is also provided with at least one set of shaping roller sets for leveling and straightening the flat part of the blank plate with a dovetail groove.

[0007] In an embodiment of the present invention, it is assumed that the dovetail groove includes a bottom flat plate, two S-shaped side walls, and two wing flat plates. The two S-shaped side walls are respectively located on both sides of the bottom flat plate. One S-shaped side wall matches one wing flat plate. The bottom arc part of the S-shaped side wall is connected to the bottom flat plate, and the top arc part of the S-shaped side wall is connected to the wing flat plate; the working surface of the first forming roller is an S-shaped curved surface adapted to the shape of the S-shaped side wall, and the working surface of the second forming roller is a convex curved surface adapted to the shape of the top arc part of the S-shaped side wall, and the first forming roller contacts the inner wall of the S-shaped side wall, and the second forming roller contacts the outer wall of the top arc part of the S-shaped side wall.

[0008] In an embodiment of the present invention, the first forming roller contacts the outer wall of the S-shaped side wall, and the second forming roller contacts the inner wall of the top arc part of the S-shaped side wall.

[0009] In an embodiment of the present invention, when the left side wall forming roller set is at least two groups, along the advancing direction of the blank plate, the angles α of all the left side wall forming roller sets are arranged at intervals from small to large; when the right side wall forming roller set is at least two groups, along the advancing direction of the blank plate, the angles α of all the right side wall forming roller sets are arranged at intervals from small to large.

[0010] In an embodiment of the present invention, the rectangular groove forming roller set includes a left side forming roller set and a right side forming roller set. Both the left side forming roller set and the right side forming roller set include a third forming roller and a fourth forming roller. The third forming roller is provided with an annular convex ring, and the fourth forming roller has an annular groove adapted to the rectangular groove; assuming the width of the annular convex ring is d1, the groove width of the annular groove is d2, and the thickness of the blank plate is d3, then (d2 - 2d3) / 2 < d1 < d2 - 2d3.

[0011] In an embodiment of the present invention, the leveling and straightening roller set is the same as the shaping roller set.

[0012] In an embodiment of the present invention, the blank plate forming device further includes at least one set of leveling rollers. Before and after the rectangular groove forming roller set processes the blank plate, the leveling rollers are used to level and straighten the flat part of the blank plate.

[0013] In an embodiment of the present invention, the blank plate forming device further includes a cutting machine for cutting the fully formed blank plate.

[0014] A lamp post forming device with a dovetail groove includes a welding device and the aforementioned blank plate forming device with a dovetail groove. The blank plates formed by the blank plate forming device with a dovetail groove enclose to form a lamp post, and the lamp post is welded and formed by the welding device.

[0015] In an embodiment of the present invention, the lamp post is a quadrangular pyramid tube-shaped lamp post.

[0016] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0017] The present invention uses a roll forming method to process the dovetail groove. First, a rectangular groove is roll formed on a flat steel plate, and then the left groove wall forming roller set and the right groove wall forming roller set are used to roll form the left and right groove walls of the rectangular groove respectively to form a semi-finished product with a dovetail groove. Then the semi-finished products are enclosed and spliced into a lamp post, and finally, full welding is performed along the corner convex edges. Selecting to weld and form here can conveniently grind the weld seam and improve the appearance quality. Compared with the prior art that uses a drawing forming method to process the dovetail groove on the lamp post, the forming device of the present invention can avoid cracks in the dovetail groove during the processing, ensure the forming quality of the dovetail groove, and improve the material utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the device corresponding to the method for forming a blank plate with a dovetail groove in the present invention;

[0020] Figure 2 It is a schematic diagram of the leveling roller set in the present invention;

[0021] Figure 3 It is a schematic diagram of the left forming roller set in the rectangular groove forming roller set in the present invention;

[0022] Figure 4 Schematic diagram of the right forming roll group in the rectangular groove forming roll group of the present invention;

[0023] Figure 5 Schematic diagram of the left groove wall forming roll group of the present invention;

[0024] Figure 6 Schematic diagram of the right groove wall forming roll group of the present invention;

[0025] Figure 7 Schematic diagram of the shaping roll group of the present invention;

[0026] Figure 8 Schematic diagram of the dovetail groove of the present invention;

[0027] Figure 9 Schematic diagram of using a blank plate to process a conical lamp post according to the present invention.

[0028] Icon: 1 - leveling machine, 11 - leveling roll group, 2 - rectangular groove cold bending forming machine, 21 - left forming roll group, 22 - right forming roll group, 23 - annular convex ring, 24 - annular groove, 31 - left groove wall forming roll group, 32 - right groove wall forming roll group, 311 - first forming roll, 312 - second forming roll, 4 - leveling and straightening roll group, 5 - shaping roll group, 61 - first cutting machine, 62 - second cutting machine, 7 - feeding rack, 8 - dovetail groove, 81 - bottom flat plate of the groove, 82 - S-shaped groove wall, 83 - wing flat plate. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the present invention, it should be noted that if terms such as "inside" and "outside" are used to indicate the orientation or positional relationship, which is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, if terms such as "arrangement", "installation", "configuration", "connection" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] Embodiment 1

[0035] A blank plate forming device with a dovetail groove includes a rectangular groove forming roller group, a dovetail groove forming roller group, and a shaping roller group 5 arranged in sequence along the advancing direction of the blank plate. The rectangular groove forming roller group is used to roll and form a rectangular groove on the blank plate; the dovetail groove forming roller group rolls the rectangular groove into a dovetail groove 8. The dovetail groove forming roller group includes a left groove wall forming roller group 31 for forming the left groove wall of the dovetail groove 8 and a right groove wall forming roller group 32 for forming the right groove wall of the dovetail groove 8. Both the left groove wall forming roller group 31 and the right groove wall forming roller group 32 include a first forming roller 311 and a second forming roller 312. The cross-section of the first forming roller 311 has an angle α with the vertical plane, and the angle between the cross-section of the second forming roller 312 and the vertical plane is the same as the angle between the cross-section of the first forming roller 311 and the vertical plane; between any two adjacent rolling passes for forming the left or right groove wall, there is a set of leveling and straightening roller groups 4 to level and straighten the bottom and two wings of the dovetail groove 8; the shaping roller group 5 has at least one set and is used to level and straighten the planar part of the blank plate with the dovetail groove 8.

[0036] The following embodiment solutions are elaborated in detail based on the above solutions.

[0037] As Figures 1-8 shown, this embodiment provides a blank plate forming device with a dovetail groove, including a first cutting machine 61, a leveling roller group 11, a rectangular groove forming roller group, a dovetail groove forming roller group, a shaping roller group 5, and a second cutting machine 62 arranged in sequence along the advancing direction of the blank plate.

[0038] In this embodiment, the leveling roller group 11 can adopt a commercially available leveling machine 1. The leveling machine 1 has multiple sets of leveling roller groups 11, such as Figure 2As shown, the steel plate released from the steel coil is fed into the leveling machine 1, and the leveling roller set 11 is used to level and straighten the blank plate. In this embodiment, the steel coil is a Q235 steel coil with a yield strength of 235 MPa and a thickness of 4 mm. It should be noted that a first cutting machine 61 is arranged between the uncoiler and the leveling roller set to cut the steel plate. Since the strip steel plate released from the steel coil is continuous, when the number and / or size parameters of the dovetail grooves are adjusted, the steel plate needs to be cut, then the equipment is adjusted, and finally production starts again.

[0039] In this embodiment, the rectangular groove forming roller set can adopt a rectangular groove cold bending forming machine 2 to roll and form rectangular grooves on the blank plate. The rectangular groove cold bending forming machine 2 contains multiple groups of rectangular groove forming roller sets, such as Figure 3 and Figure 4 As shown, through multiple passes of rolling, rectangular grooves with designed dimensions are processed on the blank plate. It should be noted that the rectangular grooves are formed by rolling in multiple passes. Each pass includes a left forming roller set 21 and a right forming roller set 22. Both the left forming roller set 21 and the right forming roller set 22 include a third forming roller and a fourth forming roller. The third forming roller is provided with an annular convex ring 23, and the fourth forming roller has an annular groove 24 adapted to the rectangular groove. Let the width of the annular convex ring be d1, the groove width of the annular groove be d2, and the thickness of the blank plate be d3. Then, (d2 - 2d3) / 2 < d1 < d2 - 2d3. The roller structures of the left forming roller set 21 and the right forming roller set 22 are the same, only the position of the annular convex ring 23 is different. The annular convex ring 23 of the left forming roller set 21 is located on the left side of the annular groove 24, as Figure 3 shown, and the annular convex ring 23 of the right forming roller set 22 is located on the right side of the annular groove 24, as Figure 4 .

[0040] For example, in one rolling pass, the leveled and straightened steel plate first passes through the left forming roller set 21 for rolling to form the left side of the rectangular groove, then passes through the right forming roller set 22 for rolling to form a rectangular groove with a set groove width. Subsequently, after a set number of rolling passes, the groove depth increases with the increase in the number of passes, and finally a rectangular groove with a set groove depth and groove width is formed.

[0041] Since the depth of the rectangular groove targeted by this forming device reaches 40 mm, which is relatively large, in each pass of forming the rectangular groove, this forming device first rolls the left half of the groove to deepen the left half of the groove, and then rolls the right half of the groove to deepen the right half of the groove, rather than directly rolling the bottom of the groove and simultaneously stretching and forming the two side walls of the groove. Because the depth of the rectangular groove is relatively large, if the bottom of the groove is directly rolled and the two side walls of the groove are simultaneously stretched and formed, during the rolling process, the plastic deformation of the two side walls will cause the metal at the bottom of the groove to flow to both sides respectively, forming a left - right pulling force on the bottom of the groove, resulting in tearing of the bottom of the rectangular groove. Therefore, the forming device of the present invention uses a single - side rolling method. For example, when rolling the left side wall of the groove, the bottom of the groove, the right side wall, and the right wing plate serve as a whole to provide sufficient metal compensation for the deformation of the left side wall. The same principle applies to the forming of the right side wall, so as to ensure the forming quality of the rectangular groove. It should be noted that the structural principle of the rectangular groove cold - bending forming machine 2 in this embodiment is the same as that of the prior art, except that the rollers are as shown in Figure 3 and Figure 4 the left forming roller set 21 and the right forming roller set 22 shown.

[0042] In this embodiment, the dovetail - groove forming roller set is used to roll the rectangular groove into a dovetail groove 8. The dovetail - groove forming roller set includes a left - side - wall forming roller set 31 and a right - side - wall forming roller set 32. The left - side - wall forming roller set 31 is used to form the left - side wall of the dovetail groove 8, and the right - side - wall forming roller set 32 is used to form the right - side wall of the dovetail groove 8. Specifically, taking the central vertical plane of the rectangular groove as the reference plane, both the left - side - wall forming roller set 31 and the right - side - wall forming roller set 32 include a first forming roller 311 and a second forming roller 312. The cross - section of the first forming roller 311 has an angle α with the reference plane, and the angle between the cross - section of the second forming roller 312 and the reference plane is the same as the angle between the cross - section of the first forming roller 311 and the reference plane, as shown in Figure 5 and Figure 6 shown. When multiple passes of rolling are required, the value of the angle α for each rolling pass is set according to the requirements of each rolling pass, and along the direction of the blank plate travel, the angles α of all the left - side - wall forming roller sets 31 and all the right - side - wall forming roller sets 32 are arranged at intervals from small to large. It should be noted that the angle α of the left - side - wall forming roller set 31 and the right - side - wall forming roller set 32 corresponding to the last rolling pass is the angle between the left and right side walls of the dovetail groove 8 and the vertical plane. The forming rollers in the left - side - wall forming roller set 31 and the right - side - wall forming roller set 32 cannot contact the upper - arc part of the dovetail - groove wall to avoid the forming rollers from wearing the workpiece.

[0043] In a production example of the present invention, after the rectangular - groove wall is rolled 3 times by the left - side - wall forming roller set 31 and the right - side - wall forming roller set 32, the angles of the groove wall after each rolling are 7°, 14°, and 20° respectively. After the rectangular groove undergoes 3 changes in the groove - wall angle, it finally becomes a dovetail groove, and the final angle of the dovetail - groove side wall is 20°.

[0044] As shown Figure 8 in FIG. 3, the dovetail groove 8 is provided with a bottom flat plate 81, two S-shaped groove walls 82 and two wing flat plates 83. The two S-shaped groove walls 82 are respectively located on both sides of the bottom flat plate 81. One S-shaped groove wall 82 is matched with one wing flat plate 83. The bottom arc part of the S-shaped groove wall 82 is connected to the bottom flat plate 81, and the top arc part of the S-shaped groove wall 82 is connected to the wing flat plate 83. Regarding the specific structures of the first forming roller 311 and the second forming roller 312, as shown Figure 5 and Figure 6 in FIGS. 4 and 5, the working surface of the first forming roller 311 is an S-shaped curved surface adapted to the shape of the S-shaped groove wall 82, and the working surface of the second forming roller 312 is a convex curved surface adapted to the shape of the top arc part of the S-shaped groove wall 82. When the rectangular groove passes through the left groove wall forming roller set 31 or the right groove wall forming roller set 32, the first forming roller 311 is inside the groove and acts on the inner wall of the S-shaped groove wall 82, and the second forming roller 312 is outside the groove and acts on the outer wall of the top arc part of the S-shaped groove wall 82. The first forming roller 311 and the second forming roller 312 are used to forcibly change the groove wall from vertical to inclined, and both the first forming roller 311 and the second forming roller 312 are non-powered rollers to reduce the resistance when rolling the blank plate. It should be noted that the positions of the first forming roller 311 and the second forming roller 312 can be interchanged, that is, the first forming roller 311 is outside the groove and acts on the outer wall of the S-shaped groove wall 82, and the second forming roller 312 is inside the groove and acts on the inner wall of the top arc part of the S-shaped groove wall 82.

[0045] Since the bottom and the two wings of the dovetail groove 8 will be deformed to a certain extent after each pass of the blank plate through the rolling process, in order to ensure the accuracy of the final forming size of the dovetail groove 8, between two adjacent rolling passes for machining the groove wall, at least one set of leveling and straightening roller set 4 is used to level and straighten the bottom and the two wings of the dovetail groove 8, and at the same time, the leveling and straightening roller set 4 provides power for the continuous advancement of the blank plate. The forming rollers of the leveling and straightening roller set 4 have the same structure as the forming rollers of the rectangular groove cold bending forming machine 2. The difference between the two is that for leveling and straightening the bottom of the dovetail groove 8, the forming rollers of the leveling and straightening roller set 4 only roll the bottom plane of the groove and do not roll the left and right side groove walls, as shown Figure 7 in FIG. 6. During the rolling process of changing the rectangular groove into the dovetail groove 8, between two adjacent rolling passes for machining the groove wall, at least one set of leveling and straightening roller set 4 is used to level and straighten the bottom and the two wings of the dovetail groove 8, and it also enables this forming device to process relatively thick blank parts. The lamp poles formed by processing such blank parts can have higher strength and load-bearing capacity.

[0046] In this embodiment, the shaping roller set 5 is the same as the leveling and straightening roller set 4. As shown Figure 7 in FIG. 7, the size of the rollers of the shaping roller set 5 must match the size of the finally shaped dovetail groove 8, and the structure of the rollers of the shaping roller set 5 is the same as that of the leveling and straightening roller set 4.

[0047] In this embodiment, the second blanking machine 62 is used to cut the fully formed blank plate. The second blanking machine 62 can be a commercially available cutting machine using a saw blade, or a commercially available hydraulic cutting device that cuts through a tool. The second blanking machine 62 can also be used to cut off workpieces during the trial production process for measurement, so as to finely adjust the positions of the respective forming rollers.

[0048] Assume that the dovetail groove 8 is formed through 3 angle changes. Then, there are 3 groups each for the left groove wall forming roller group 31 and the right groove wall forming roller group 32, and 5 groups for the leveling and straightening roller group 4. As Figure 1 shown, the working process of the blank plate forming device with the dovetail groove 8 in this embodiment is as follows: The raw material steel plate first enters the leveling machine 1, and the steel plate leveling roller group 11 is used to level and straighten the steel plate. Then, the steel plate enters the rectangular groove cold bending forming machine 2, and after being roll-pressed through at least one pass, a rectangular groove is formed on the steel plate to form a blank plate with a rectangular groove. Then, under the push of the rectangular groove cold bending forming machine 2, the two side groove walls of the rectangular groove pass through the first-pass left groove wall forming roller group 31, the first leveling and straightening roller group 4, and the first-pass right groove wall forming roller group 32 successively, and then enter the second group of leveling and straightening roller group 4. After that, it passes through the second-pass left groove wall forming roller group 31, the third leveling and straightening roller group 4, and the second-pass right groove wall forming roller group 32, and then enters the fourth group of leveling and straightening roller group 4. After that, it passes through the third-pass left groove wall forming roller group 31, the fifth leveling and straightening roller group 4, and the third-pass right groove wall forming roller group 32, and finally enters the shaping roller group, and the shaping roller group also adopts a power roller group. Since both the left groove wall forming roller group 31 and the right groove wall forming roller group 32 are non-powered rollers, the rectangular groove cold bending forming machine 2, the leveling and straightening roller group 4, and the shaping roller group before and after the left groove wall forming roller group 31 and the right groove wall forming roller group 32 provide sufficient power for the blank plate, pulling forward and pushing backward, so that the blank plate has sufficient power to pass through the left groove wall forming roller group 31 and the right groove wall forming roller group 32 and be roll-formed.

[0049] It should be noted that since the depth of the rectangular groove targeted by this forming device reaches 40 mm and the groove depth is relatively large, in each pass of the dovetail groove forming of this forming device, a processing device that first roll-presses one side groove wall and then the other side groove wall is adopted, rather than a forming device that simultaneously roll-presses the two side groove walls of the dovetail groove 8. Because when forming the dovetail groove 8 by simultaneously roll-pressing the two side groove walls, during the roll-pressing process, the two side groove walls bend and deform, causing the metal at the bottom of the groove to flow to both sides respectively, forming a left-right pulling force on the bottom of the groove, resulting in tearing of the bottom of the dovetail groove 8. Therefore, the forming device of the present invention adopts a single-sided roll-pressing method. For example, when roll-pressing the left side groove wall, the bottom of the groove, the right side groove wall, and the right side wing plate serve as a whole to provide sufficient metal compensation for the deformation of the left side groove wall. The same applies to the forming of the right side groove wall, so as to ensure the forming quality of the dovetail groove 8.

[0050] It should be noted that this forming method can also produce lamp poles with high strength grades, such as Q355 or Q460, etc. It is basically impossible to process the dovetail grooves by the existing cold drawing technology.

[0051] When two dovetail grooves 8 need to be formed on the same blank plate, first, according to the number of dovetail grooves 8, the left groove wall forming roller set 31 and the right groove wall forming roller set 32 are increased. That is, in each rolling pass of the dovetail groove 8, one dovetail groove 8 corresponds to a series of left groove wall forming roller sets 31 and right groove wall forming roller sets 32 for processing and forming, and the other dovetail groove 8 corresponds to another series of left groove wall forming roller sets 31 and right groove wall forming roller sets 32 for processing and forming. At the same time, the rollers of the rectangular groove cold bending forming machine 2, the leveling and straightening roller set 4 and the straightening roller are all synchronously replaced to adapt to the structure of the two dovetail grooves 8. After the equipment is adjusted completely, according to the forming process of the blank plate with the dovetail groove 8 described above, two parallel dovetail grooves 8 are processed on the blank plate.

[0052] The present invention uses a rolling forming method to process the dovetail groove. First, a rectangular groove is rolled on a flat steel plate, and then the left groove wall forming roller set and the right groove wall forming roller set are used to roll the left groove wall and the right groove wall of the rectangular groove respectively to form a semi-finished product with a dovetail groove. Then, the semi-finished products are surrounded and spliced into a lamp pole, and finally, full welding is carried out along the corner convex edge. Selecting to weld and form here can conveniently grind the weld seam and improve the appearance quality. Compared with the existing technology of using a drawing forming method to process the dovetail groove on the lamp pole, the forming device of the present invention can avoid cracks in the dovetail groove during the processing process, improve the forming efficiency of the dovetail groove, and ensure the forming quality of the dovetail groove.

[0053] Embodiment 2

[0054] This embodiment provides a lamp pole forming device with a dovetail groove, which includes a welding device and the blank plate forming device with a dovetail groove as described above. The blank plates formed by the blank plate forming device with a dovetail groove are surrounded to form a lamp pole, and the lamp pole is welded and formed by the welding device. The welding device can be a commercially available arc welding device or other existing welding devices.

[0055] When the lamp pole is a quadrangular pyramid tube-shaped lamp pole, first, the blank plate forming device with a dovetail groove described above is used to process the blank plates for each side of the lamp pole. Then, the blank plates are cut into trapezoidal blank plates, and then the trapezoidal blank plates are spot-welded and assembled into a quadrangular pyramid tube shape. Finally, full welding is carried out along the corner convex edge to finally form a quadrangular pyramid tube-shaped lamp pole. The cross-sectional shape of the lamp pole is as Figure 9 shown. The conical tube-shaped lamp pole refers to a lamp pole whose pipe diameter gradually changes from small to large along the length direction of the lamp pole.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A blank plate forming device with a dovetail groove, comprising a rectangular groove forming roller set and a dovetail groove forming roller set arranged in sequence along the advancing direction of the blank plate, characterized in that: The rectangular groove forming roller set is used to roll and form a rectangular groove on the blank plate; The dovetail groove forming roller set rolls the rectangular groove into a dovetail groove. The dovetail groove forming roller set includes a left dovetail groove forming roller set for forming the left side wall of the dovetail groove and a right dovetail groove forming roller set for forming the right side wall of the dovetail groove. Both the left side wall forming roller set and the right side wall forming roller set include a first forming roller and a second forming roller. The cross-section of the first forming roller has an angle α with the vertical plane, and the angle between the cross-section of the second forming roller and the vertical plane is the same as the angle between the cross-section of the first forming roller and the vertical plane; Between any two adjacent rolling passes for forming the left or right side wall, there is a set of leveling and straightening roller sets to level and straighten the bottom and two wings of the dovetail groove; The blank plate forming device is also provided with at least one set of shaping roller sets for leveling and straightening the flat part of the blank plate with a dovetail groove.

2. The blank plate forming device with a dovetail groove according to claim 1, characterized in that: provided The dovetail groove includes a bottom flat plate, two S-shaped side walls, and two wing flat plates. The two S-shaped side walls are respectively located on both sides of the bottom flat plate. One S-shaped side wall matches one wing flat plate. The bottom arc part of the S-shaped side wall is connected to the bottom flat plate, and the top arc part of the S-shaped side wall is connected to the wing flat plate; The working surface of the first forming roller is an S-shaped curved surface adapted to the shape of the S-shaped side wall, and the working surface of the second forming roller is a convex curved surface adapted to the shape of the top arc part of the S-shaped side wall. The first forming roller contacts the inner wall of the S-shaped side wall, and the second forming roller contacts the outer wall of the top arc part of the S-shaped side wall.

3. The blank plate forming device with a dovetail groove according to claim 2, characterized in that: The first forming roller contacts the outer wall of the S-shaped side wall, and the second forming roller contacts the inner wall of the top arc part of the S-shaped side wall.

4. The blank plate forming device with a dovetail groove according to claim 1, characterized in that: When the left side wall forming roller set is at least two groups, along the advancing direction of the blank plate, the angles α of all the left side wall forming roller sets are arranged at intervals from small to large; when the right side wall forming roller set is at least two groups, along the advancing direction of the blank plate, the angles α of all the right side wall forming roller sets are arranged at intervals from small to large.

5. The blank plate forming device with a dovetail groove according to claim 1, characterized in that: The rectangular groove forming roller set includes a left side forming roller set and a right side forming roller set. Both the left side forming roller set and the right side forming roller set include a third forming roller and a fourth forming roller. The third forming roller is provided with an annular convex ring, and the fourth forming roller has an annular groove adapted to the rectangular groove; let the width of the annular convex ring be d1, the groove width of the annular groove be d2, and the thickness of the blank plate be d3, then (d2 - 2d3) / 2 < d1 < d2 - 2d3.

6. The blank plate forming device with a dovetail groove according to claim 1, characterized in that: The leveling and straightening roller set is the same as the shaping roller set.

7. The blank plate forming device with a dovetail groove according to claim 1, characterized in that: The blank plate forming device also includes at least one set of flattening roller sets, which are used to level and straighten the flat part of the blank plate before and after the rectangular groove forming roller set processes the blank plate.

8. The blank plate forming device with a dovetail groove according to claim 1, characterized in that: The blank plate forming device also includes a cutting machine for cutting the completely formed blank plate.

9. A lamp post forming device with a dovetail groove, characterized in that: It includes a welding device and the blank plate forming device with a dovetail groove as described in any one of claims 1 - 8. The blank plates formed by the blank plate forming device with a dovetail groove enclose to form a lamp post, and the lamp post is welded and formed by the welding device.

10. The lamp post forming device with a dovetail groove according to claim 9, characterized in that: The lamp post is a square pyramid tube-shaped lamp post.

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