Bending device and bending system for steel plate for longitudinal welded pipe

Abstract

The invention discloses a bending device and a bending system for a steel plate for a longitudinal welded pipe, and relates to the technical field of steel plate machining equipment.The bending device comprises two bending assemblies, each bending assembly comprises a rack, a hydraulic driving module and a control module, the rack is provided with an upper die for bending the steel plate, and the hydraulic driving module is connected with the control module; the hydraulic driving module comprises two main oil cylinders and two main control valves which are correspondingly connected, and telescopic rods of the two main oil cylinders are provided with lower dies corresponding to the upper dies. The control module is connected with the two main control valves and is configured to obtain the thickness of a steel plate when the steel plate is bent, and the target displacement, the dwell pressure and the dwell time of the two main oil cylinders are determined according to the thickness of the steel plate and a preset mapping relation; and the two main control valves are controlled to act, so that the two main oil cylinders push the lower die to bend the steel plate according to the determined target displacement, dwell pressure and dwell time. The forming quality of the finally-bent steel plate can be good, the bent steel plate is not prone to deformation before the next procedure, and the quality of the next process is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate processing equipment, in particular to a bending device and bending system for a straight seam welded pipe steel plate. BACKGROUND

[0002] At present, before welding, the straight seam welded pipe steel plate needs to be bent into a "J" shape in a pre-bending process, and the two sides of the plate edge are symmetrical, which prepares for subsequent "C" and "O" forming. The "J" forming of the straight seam welded pipe steel plate is a key step in the production of straight seam welded pipes.

[0003] In the prior art, the bending device drives the mold with a hydraulic cylinder to bend the straight seam welded pipe steel plate into a "J" shape, and then the hydraulic cylinder is kept at a certain pressure for a period of time, and then the bent steel plate is transported to the next process. However, it is found in field application that the steel plate will generally have some internal stress after bending, and some specifications of the steel plate will deform again after bending, which will affect the quality of the next process and ultimately affect the welding quality of the straight seam welded pipe. Therefore, it is necessary to improve the existing bending device to meet the process requirements of bending the straight seam welded pipe steel plate into a "J" shape. SUMMARY

[0004] The embodiment of the present application provides a bending device and bending system for a straight seam welded pipe steel plate to solve the technical problem in the related art that the existing bending device bends the straight seam welded pipe steel plate into a "J" shape in a pre-bending process, and the bent steel plate deforms again before the next process, which is difficult to guarantee the quality of the next process.

[0005] In a first aspect, a bending device for a straight seam welded pipe steel plate is provided, comprising: Two bending assemblies are symmetrically arranged at intervals, and each of the bending assemblies comprises: A rack is provided with an upper die for bending the steel plate; A hydraulic drive module comprises two main oil cylinders and two main control valves connected correspondingly, the two main oil cylinders are arranged on the rack at intervals along the moving direction of the steel plate, and a lower die corresponding to the upper die is arranged on the extension rod of the two main oil cylinders; A control module is connected with the two main control valves and is configured to: When bending the steel plate, the thickness of the steel plate is obtained, the target displacement, the holding pressure and the holding time of the two main oil cylinders are determined according to the thickness of the steel plate and a preset mapping relationship; The two main control valves are controlled to act, so that the two main oil cylinders push the lower die to bend the steel plate at the determined target displacement, holding pressure and holding time.

[0006] In some embodiments, the control module comprises: A controller is connected with the two main control valves; a thickness gauge disposed on the frame and connected with the controller; two displacement sensors respectively disposed on the two main oil cylinders and connected with the controller; two pressure sensors respectively disposed on the pipelines between the two main oil cylinders and the two main control valves connected therewith and connected with the controller.

[0007] In some embodiments, the bending device further comprises: a front input roller table disposed on the front side of the two bending assemblies, the front input roller table being provided with a position sensor and an encoder connected with the controller.

[0008] In some embodiments, the bending device further comprises: a rear output roller table disposed on the rear side of the two bending assemblies, the rear output roller table being provided with a position sensor connected with the controller.

[0009] In some embodiments, the controller is a SIMATIC S7-1500 controller.

[0010] In some embodiments, each hydraulic drive module further comprises: two first auxiliary oil cylinders arranged on the frame in the steel plate moving direction, the telescopic rods of the two first auxiliary oil cylinders being provided with clamping beams for clamping the steel plate.

[0011] In some embodiments, each hydraulic drive module further comprises: two second auxiliary oil cylinders disposed on the frame in the steel plate moving direction, the telescopic rods of the two second auxiliary oil cylinders being connected with the lower die.

[0012] In some embodiments, the two frames are provided with a plurality of position sensors connected with the controller.

[0013] In some embodiments, the frame is provided with a transition roller.

[0014] In a second aspect, a bending system for bending a steel plate for a straight seam welded pipe is provided, comprising the bending device for bending a steel plate for a straight seam welded pipe as described above.

[0015] The technical solutions provided by the present application have the following beneficial effects: The bending device for the straight-seam welded pipe steel plate provided by the embodiment of the present application is provided with two bending assemblies, each of which comprises a hydraulic drive module and a control module, the control module determines the target displacement, pressure maintaining pressure and pressure maintaining time of the two main oil cylinders according to the thickness of the steel plate and a preset mapping relationship, and controls the action of the two main control valves, so that the two main oil cylinders push the lower die to bend the steel plate at the target displacement, pressure maintaining pressure and pressure maintaining time, that is, the target displacement, pressure maintaining pressure and pressure maintaining time of the bent steel plate change in real time with the thickness of the steel plate, so that the formed steel plate has good quality, the bent steel plate is not prone to deformation before the next process, and the quality of the next process is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0017] Figure 1 A front view of the bending device for the straight-seam welded pipe steel plate provided by the embodiment of the present application is provided. Figure 2 A view in the A-A direction of the bending device for the straight-seam welded pipe steel plate provided by the embodiment of the present application is provided. Figure 1 Figure 3 A hydraulic control principle diagram of the bending device for the straight-seam welded pipe steel plate provided by the embodiment of the present application is provided. Figure 4 A top view of the bending device for the straight-seam welded pipe steel plate provided by the embodiment of the present application is provided. Reference signs: 1, bending assembly; 11, rack; 111, upper die; 112, lower die; 113, clamping beam; 12, hydraulic drive module; 121, main oil cylinder; 122, main control valve; 123, first auxiliary oil cylinder; 124, second auxiliary oil cylinder; 125, first auxiliary control valve; 126, second auxiliary control valve; 127, hydraulic pump station; 13, control module; 131, controller; 132, thickness gauge; 133, displacement sensor; 134, pressure sensor; 2, front input roller table; 3, rear output roller table. DETAILED DESCRIPTION

[0018] ​In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] The bending device for the straight-seam welded pipe steel plate provided by the embodiments of the present application can solve the technical problem that the straight-seam welded pipe steel plate is deformed again before the next process after being bent into a "J" shape in the pre-bending process by the existing bending device, and it is difficult to guarantee the quality of the next process.

[0020] Referring to FIGS. 1 and 2, Figure 1 and Figure 2 The bending device for the straight-seam welded pipe steel plate provided by the embodiments of the present application includes two bending assemblies 1 which are symmetrically arranged at intervals, and each of the bending assemblies 1 includes a rack 11, a hydraulic drive module 12 and a control module 13.

[0021] The rack 11 is provided with an upper die 111 for bending the steel plate, and the hydraulic drive module 12 includes two main oil cylinders 121 and two main control valves 122 which are connected correspondingly. The two main oil cylinders 121 are arranged on the rack 11 along the moving direction of the steel plate at intervals, and the telescopic rods of the two main oil cylinders 121 are provided with lower dies 112 which correspond to the upper die 111.

[0022] The control module 13 is connected with the two main control valves 122 and is configured to: When the steel plate is bent, the thickness of the steel plate is obtained, the target displacement, the holding pressure and the holding time of the two main oil cylinders 121 are determined according to the thickness of the steel plate and a preset mapping relationship; The two main control valves 122 are controlled to act, so that the two main oil cylinders 121 push the lower dies 112 to bend the steel plate at the determined target displacement, holding pressure and holding time.

[0023] For example, referring to Table 1, when the thickness of the steel plate is 10 mm, the target displacement of the two main oil cylinders 121 is 240 mm, the holding pressure is 12 MPa and the holding time is 1 s according to the thickness of the steel plate and the preset mapping relationship, and the two main control valves 122 are regulated and controlled so that the two main oil cylinders 121 bend the steel plate at the target displacement of 240 mm, the holding pressure of 12 MPa and the holding time of 1 s.

[0024] Table 1

[0025] The bending device for the straight-seam welded pipe steel plate provided by the embodiment of the application is provided with two bending assemblies, each of the bending assemblies comprises a hydraulic drive module and a control module, the control module determines the target displacement, the pressure maintaining pressure and the pressure maintaining time of the two main oil cylinders according to the thickness of the steel plate and a preset mapping relationship, and controls the action of the two main control valves, so that the two main oil cylinders push the lower die to bend the steel plate at the target displacement, the pressure maintaining pressure and the pressure maintaining time, that is, the target displacement, the pressure maintaining pressure and the pressure maintaining time of the bent steel plate change in real time with the thickness of the steel plate, so that the formed quality of the finally bent steel plate is good, and the bent steel plate is not prone to deformation before the next process, thereby ensuring the quality of the next process.

[0026] As an optional embodiment, in one embodiment of the application, as shown in Figure 3 The control module 13 comprises a controller 131, a thickness gauge 132, two displacement sensors 133 and two pressure sensors 134.

[0027] The controller 131 is connected with the two main control valves 122, the thickness gauge 132 is arranged on the rack 11 and connected with the controller 131, the two displacement sensors 133 are arranged on the two main oil cylinders 121 respectively and connected with the controller 131, and the two pressure sensors 134 are arranged on the pipelines between the two main oil cylinders 121 and the two main control valves 122 connected respectively and connected with the controller 131.

[0028] The thickness gauge 132 is used for detecting the thickness of the steel plate and feeding back the detection result to the controller 131. The two displacement sensors 133 are used for detecting the position of the telescopic rods of the main oil cylinders 121 and feeding back the detection result to the controller 131. The two pressure sensors 134 are used for detecting the working pressure of the main oil cylinders 121 and feeding back the detection result to the controller 131. When the steel plate is bent, the controller 131 obtains the thickness of the steel plate through the thickness gauge 132 and controls the action of the two main control valves 122, so that the two main oil cylinders 121 push the lower die 112 at the determined target displacement, pressure maintaining pressure and pressure maintaining time. The two displacement sensors 133 and the two pressure sensors 134 can feed back the displacement and the pressure in real time, so as to ensure the control precision of the two main control valves 122.

[0029] It should be noted that the two bending assemblies 1 can share a controller 131, which is a SIMATIC S7-1500 controller. The SIMATIC S7-1500 controller has high reliability and powerful functions, and also has powerful debugging and diagnosis functions. Similarly, considering that the hydraulic drive module 12 generally requires hydraulic supporting equipment such as a hydraulic pump station 127, the hydraulic drive modules 12 of the two bending assemblies 1 can share the hydraulic supporting equipment such as the hydraulic pump station 127.

[0030] As an optional embodiment, in one embodiment of the application, referring to Figure 4 As shown in the figure, the bending device further comprises a front input roller 2, which is arranged on the front side of the two bending assemblies 1. The front input roller 2 is provided with a position sensor A1 and an encoder A2 connected with the controller 131. The front input roller 2 is used to transport the steel plate to be bent to the two bending assemblies 1. The position sensor A1 and the encoder A2 can feed back the position of the steel plate to the controller 131 in real time, facilitating automatic control.

[0031] As an optional embodiment, in one embodiment of the application, referring to Figure 4 As shown in the figure, the bending device further comprises a rear output roller 3, which is arranged on the rear side of the two bending assemblies 1. The rear output roller 3 is provided with position sensors A7 and A8 connected with the controller 131. The rear output roller 3 is used to transport the bent steel plate from the two bending assemblies 1 to the next link. The position sensors A7 and A8 can feed back the position of the steel plate to the controller 131 in real time, facilitating automatic control.

[0032] As an optional embodiment, in one embodiment of the application, referring to Figure 2 and Figure 3 As shown in the figures, each hydraulic drive module 12 further comprises two first auxiliary oil cylinders 123, which are arranged on the rack 11 in the direction of movement of the steel plate. The extension rods of the two first auxiliary oil cylinders 123 are provided with clamping beams 113 for clamping the steel plate. The two first auxiliary oil cylinders 123 are used to drive the clamping beams 113 to move and clamp the steel plate, ensuring the quality of the bending of the steel plate. It should be noted that the two first auxiliary oil cylinders 123 can be correspondingly provided with two first auxiliary control valves 125 connected with the controller 131, which control the action of the two first auxiliary oil cylinders 123 according to the control signal of the controller 131.

[0033] As an optional embodiment, in one embodiment of the application, referring to Figure 2 and Figure 3As shown, each of the hydraulic drive module 12 further comprises: two second sub-cylinder 124, two second sub-cylinder 124 is arranged on the rack 11 along the direction of the steel plate is spaced apart, the telescopic rod of two second sub-cylinder 124 connects the lower die 112. Two second sub-cylinder 124 is used to drive the lower die 112 to move back to release the steel plate, enter the next cycle to bend the next steel plate. It should be noted that two second sub-cylinder 124 can be configured with the second sub-control valve 126 connected with the controller 131, and the action of two first sub-cylinder 123 is controlled according to the control signal of the controller 131.

[0034] As an optional embodiment, in one embodiment of the application, referring to Figure 4 As shown, a plurality of position sensors A3, A4, A5, A6 connected with the controller 131 are arranged on the two racks 11, which facilitate the positioning of the steel plate on the two bending assemblies 1 and ensure the bending accuracy of the steel plate.

[0035] As an optional embodiment, in one embodiment of the application, referring to Figure 1 As shown, transition rollers 114 are arranged on the two racks 11, which facilitate the conveying of the steel plate.

[0036] The working mode of the straight seam welded pipe steel plate bending device in the embodiment is as follows: Figure 4 In the embodiment, the components represented by the reference numerals are listed as follows: G7-1, G7-2, G7-3, G7-4, G7-5, G7-6, G7-7, G7-8, G7-9, G7-10, G7-11, G7-12, G7-13 are G7 steel plate conveying rollers (front input roller 2); G8-1, G8-2, G8-3, G8-4, G8-5, G8-6, G8-7, G8-8, G8-9, G8-10, G8-11, G8-12 are G8 steel plate conveying rollers (rear output roller 3).

[0037] A1 is a position sensor of the G7 steel plate conveying roller, A2 is an encoder, A3, A4, A5, A6 are position sensors of the two bending assemblies, and A7, A8 are position sensors of the G8 conveying roller.

[0038] (1) Steel plate control After the steel plate finishes the edge milling process, it is moved to the G7 steel plate conveying roller and moves towards the two bending assemblies. When the steel plate moves forward, the positioning position of the steel plate is determined, and the steel plate stops at the appropriate position. During the control, the position sensors A1, A5, A6 and the encoder A2 are used.

[0039] In the full-automatic operation mode, the steel plate is transmitted from the G7 section steel plate conveying roller, and the steel plate enters the transition roller of the two bending assemblies, and the steel plate stops at the appropriate position.

[0040] (2) Steel plate bending control After the steel plate enters the steel plate control, the steel plate meets the bending condition, the controller issues a command, and the two bending assemblies are driven by the hydraulic system to lift the lower mold. During the lifting process, first, the first auxiliary oil cylinder contacts the steel plate through the clamping beam to clamp the steel plate and prevent the steel plate from deforming during the bending process. Then, the main oil cylinder continues to rise, and the main oil cylinder pushes the lower mold to bend the steel plate with a certain target displacement, holding pressure and holding time. Finally, the second auxiliary oil cylinder drives the lower mold to descend to the initial position, and the lower mold pressure is released. During the control period, the steel plate is bent several times between the two bending assemblies in the forward direction. During the forward movement and positioning of the steel plate, the encoder A2 and the position sensors A3 and A4 are used.

[0041] (3) Steel plate ejection control After the steel plate bending control is completed, the steel plate is moved to the G8 section steel plate conveying roller, and the G8 section steel plate conveying roller transports the bent steel plate to the next process. During the control period, the position sensors A7 and A8 are used.

[0042] The embodiment of the present application also provides a bending system for bending a steel plate for a straight seam welded pipe, which comprises the aforementioned bending device for the steel plate for the straight seam welded pipe.

[0043] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a fixed connection, or 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, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0045] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the scope of the application is intended to be defined only as set forth in the claims.

Claims

1. A bending device for steel plates used in straight seam welded pipes, characterized in that, include: Two symmetrically spaced bending components (1), each of the bending components (1) comprising: The frame (11) is provided with an upper mold (111) for bending steel plates. The hydraulic drive module (12) includes two main cylinders (121) and two main control valves (122) connected to each other. The two main cylinders (121) are arranged at intervals on the frame (11) along the moving direction of the steel plate. The telescopic rods of the two main cylinders (121) are provided with a lower mold (112) corresponding to the upper mold (111). The control module (13), which is connected to the two main control valves (122), is configured to: When bending the steel plate, the thickness of the steel plate is obtained, and the target displacement, holding pressure and holding time of the two main oil cylinders (121) are determined according to the thickness of the steel plate and the preset mapping relationship. The two main control valves (122) are controlled to operate, causing the two main oil cylinders (121) to push the lower mold (112) to bend the steel plate at a determined target displacement, holding pressure and holding time.

2. The bending device for a straight-seam welded pipe steel sheet according to claim 1, characterized by The control module (13) includes: A controller (131) is connected to the two main control valves (122); A thickness gauge (132) is mounted on the frame (11) and connected to the controller (131); Two displacement sensors (133) are respectively installed on the two main hydraulic cylinders (121) and are both connected to the controller (131); Two pressure sensors (134) are respectively installed on the pipelines between the two main oil cylinders (121) and the two main control valves (122) that are connected to each other, and are both connected to the controller (131).

3. The bending apparatus for a straight-seam welded pipe steel sheet according to claim 2, characterized by The bending device further includes: A front input roller conveyor (2) is located on the front side of the two bending assemblies (1), and the front input roller conveyor (2) is provided with a position sensor and an encoder connected to the controller (131).

4. The bending apparatus for a straight-seam welded pipe steel sheet according to claim 2, characterized by The bending device further includes: The rear output roller conveyor (3) is located on the rear side of the two bending assemblies (1), and the rear output roller conveyor (3) is provided with a position sensor connected to the controller (131).

5. The bending apparatus for a straight-seam welded pipe steel sheet according to claim 2, characterized by: The controller used is a SIMATIC S7-1500 controller.

6. The bending apparatus for a straight-seam welded pipe steel sheet according to claim 1, characterized by Each of the hydraulic drive modules (12) further includes: Two first auxiliary cylinders (123) are arranged at intervals on the frame (11) along the direction of movement of the steel plate, and clamping beams (113) for clamping the steel plate are provided on the telescopic rods of the two first auxiliary cylinders (123).

7. The bending apparatus for a straight-seam welded pipe steel sheet according to claim 1, characterized by Each of the hydraulic drive modules (12) further includes: Two secondary hydraulic cylinders (124) are arranged at intervals on the frame (11) along the direction of movement of the steel plate, and the telescopic rods of the two secondary hydraulic cylinders (124) are connected to the lower mold (112).

8. The bending device for steel plates used in straight seam welded pipes according to claim 2, characterized in that: The two racks (11) are equipped with a plurality of position sensors connected to the controller (131).

9. The bending apparatus for a straight-seam welded pipe steel sheet according to claim 1, characterized by: The frame (11) is provided with transition rollers (114).

10. A bending system for bending a steel sheet for a straight-seam welded pipe, characterized by The bending device includes the steel plate for straight seam welded pipe as described in any one of claims 1-9.

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