A heat source movable pre-welding heating device and a pre-welding heating welding method

Abstract

The application discloses a kind of heat source movable's pre-welding preheating device and pre-welding preheating welding method, device includes workpiece clamping mechanism, heating mechanism and offline programming system;The workpiece clamping mechanism is used to clamp the workpiece to be welded, and the heating mechanism is used to preheat weld;The offline programming system is used to preset the preheating position of heating mechanism, and control heating mechanism adjusts the preheating position and preheating time of workpiece.The method is carried out using the above device.By presetting the position of weld and preheating time in the offline programming system, the heating mechanism moves to the preheating position according to the signal to preheat the weld;Workpiece clamping mechanism plays a fixed role to workpiece main body, which is convenient for cooperating with heating mechanism to position and track weld, so as to realize automatic preheating, improve preheating efficiency and improve welding quality.By automatic preheating from below, timely welding from above, there is no need to frequently transport workpiece or manually adjust preheating position to carry out efficient and reliable welding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pre-welding preheating, in particular to a pre-welding preheating device with movable heat source and a pre-welding preheating welding method. BACKGROUND

[0002] Steel structure is a commonly used industrial and building component, in order to meet the structural load requirements of steel structure, the strength of steel structure is usually required to be very high, and the steel structure is generally welded by a large number of steel plates or steel pipes, which requires high welding quality in the welding process, and cracks and other defects are prone to occur in the welding process, which will greatly affect the strength of the steel structure. In the construction process of steel structure, the steel needs to be preheated to a certain extent to avoid defects in the welding process.

[0003] In the existing pre-welding preheating of steel structure, when there are many to-be-welded points on the workpiece and the to-be-welded points are far apart, in order to ensure that each to-be-welded point is within the ideal temperature range before welding, multiple preheating and multiple adjustment of the work station are required to achieve the purpose of preheating, which is time-consuming and laborious. And the preheating and welding are carried out separately, which is easy to cause heat loss and affect the welding quality. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a pre-welding preheating device with movable heat source and a pre-welding preheating welding method, which can solve the problems of low pre-welding preheating efficiency, difficult preheating position adjustment and separate preheating and welding in the prior art.

[0005] To solve the above technical problems, the present application adopts the following technical scheme:

[0006] A pre-welding preheating device with movable heat source, comprising a workpiece clamping mechanism, a heating mechanism, an offline programming system and a central control system; the workpiece clamping mechanism is used for clamping the to-be-welded workpiece; the offline programming system is pre-set with the to-be-welded point coordinates of the workpiece; the heating mechanism is provided with a movable heat source, which is moved to the to-be-welded point of the workpiece under the control of the central control system for preheating.

[0007] As a further improvement of the above scheme:

[0008] The workpiece comprises a main piece, and the workpiece clamping mechanism comprises a jacking cylinder, a pressing cylinder and a workpiece clamping servo motor, the servo motor horizontally adjusts the cylinder push rod of the jacking cylinder and the pressing cylinder to fix and clamp the main piece.

[0009] The workpiece further comprises an accessory, which is temporarily fixed on the main piece by manual or robot for welding.

[0010] The heat source is a heating coil which heats the to-be-welded point by electromagnetic induction; the heating coil is controlled to displace by a heating servo walking mechanism.

[0011] The offline programming system is preset with a standard temperature of pre-welding preheating; the heating mechanism further comprises a temperature sensor for judging whether the temperature of the to-be-welded point reaches the standard.

[0012] When the workpiece clamping mechanism finishes clamping the main piece, the heating coil is located below the main piece.

[0013] A temperature measuring hole is formed in the heating coil, and the temperature sensor is fixed below the temperature measuring hole, so as to directly measure the surface temperature of the workpiece through the temperature measuring hole.

[0014] The servo walking mechanism controls the horizontal transverse movement of the heating coil.

[0015] A pre-welding preheating welding method is provided, which is performed by the heat source movable pre-welding preheating device, and comprises the following steps:

[0016] S1, offline programming: according to the to-be-welded point of the workpiece, the preheating point of the heating mechanism and the preheating standard temperature are set;

[0017] S2, clamping the workpiece: clamp the main piece, and then clamp the accessories one by one according to the preset sequence;

[0018] S3, running the preheating program and welding: the heating coil is moved to below the first to-be-welded point according to the program setting, and the coil starts heating after being positioned; after the preheating of the first to-be-welded point is completed, the accessories are welded from above the main piece, while the coil is moved to below the next to-be-welded point for preheating, and the preheating and welding process is repeated until all are completed.

[0019] Compared with the prior art, the advantages of the present application are:

[0020] The present application provides a heat source movable pre-welding preheating device and a pre-welding preheating welding method, by presetting the position of the to-be-welded point and the preheating time in the offline programming system, the heating mechanism is moved to the preheating position according to the signal to preheat the to-be-welded point; the workpiece clamping mechanism plays a fixing role for the main body of the workpiece, which is convenient for positioning and tracking the to-be-welded point with the heating mechanism, so as to realize automatic preheating, improve the preheating efficiency and ensure the subsequent welding quality. By the welding method of automatic preheating from below and timely welding from above, the workpiece does not need to be frequently transported or manually adjusted for preheating position, so as to realize efficient and reliable welding. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1It is a structure schematic perspective view of the pre-welding preheating device with movable heat source in the embodiment of the present application.

[0022] Fig. 2 It is a structure schematic plan view of the pre-welding preheating device with movable heat source in the embodiment of the present application.

[0023] Fig. 3 It is a structure schematic perspective view of the pre-welding preheating device with movable heat source in the embodiment of the present application.

[0024] Fig. 4 It is a structure schematic front view of the pre-welding preheating device with movable heat source in the embodiment of the present application.

[0025] The numbers in the figure represent:

[0026] 1, workpiece clamping mechanism; 11, jacking cylinder; 12, pressing cylinder; 13, workpiece clamping servo motor; 2, heating mechanism; 21, heating coil; 22, heating servo walking mechanism; 23, temperature sensor; 24, temperature measuring hole; 3, workpiece; 31, main piece; 32, accessory; 33, to-be-welded point. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0028] Figs. 1 to 4 A pre-welding preheating device with movable heat source is shown, which comprises a workpiece clamping mechanism 1, a heating mechanism 2, an offline programming system and a central control system; the workpiece clamping mechanism 1 is used for clamping a to-be-welded workpiece 3; the offline programming system is preset with the coordinates of the to-be-welded point 33 of the workpiece 3; the heating mechanism 2 is provided with movable heat source, which is moved to the to-be-welded point 33 of the workpiece 3 for preheating under the control of the central control system. In this structure, the position of the to-be-welded point 33 and the preheating time are preset in the offline programming system, so that the heating mechanism 2 moves to the preheating position according to the signal to preheat the to-be-welded point 33; the workpiece clamping mechanism 1 plays a fixing role for the main body of the workpiece 3, which is convenient for positioning and tracking the to-be-welded point 33 by the heating mechanism 2, so as to realize automatic preheating, improve preheating efficiency and improve welding quality.

[0029] In this embodiment, the workpiece 3 comprises a main piece 31 and an accessory 32, and the workpiece clamping mechanism 1 comprises a jacking cylinder 11, a pressing cylinder 12 and a workpiece clamping servo motor 13; the servo motor horizontally adjusts the cylinder push rod of the jacking cylinder 11 and the pressing cylinder 12 for fixing and clamping the main piece 31. In this structure, the jacking cylinder 11 clamps the workpiece 3 from the horizontal direction, the pressing cylinder 12 clamps the main piece 31 from the vertical direction, and the accessory 32 can be fixed by a grabbing robot or other methods.

[0030] In the embodiment, the heat source is the heating coil 21 which heats the to-be-welded point 33 through electromagnetic induction; the heating coil 21 is controlled to displace by the heating servo walking mechanism 22 to heat the to-be-welded point 33. In the structure, the heating coil 21 is used to preheat the to-be-welded point 33 through electromagnetic induction, which is more efficient, safe and environmentally friendly than open flame heating. The heating servo walking mechanism 22 receives the preset signal of the offline programming system to control the displacement and heating time of the heating coil 21, so that the heating mechanism 2 preheats the to-be-welded point 33 at different positions to achieve the required preheating temperature.

[0031] In the embodiment, the offline programming system is preset with a standard temperature for preheating before welding, and the heating mechanism 2 further comprises a temperature sensor 23 which is signal-connected with the offline programming system and is used to judge whether the temperature of the to-be-welded point 33 meets the standard. In the structure, the temperature sensor 23 is arranged to monitor whether the preheating position reaches the preset temperature, and if not, the offline programming system transmits a signal to the heating servo walking mechanism 22 to prolong the preheating time, so as to accurately control the preheating temperature and ensure the subsequent welding quality.

[0032] In the embodiment, when the workpiece clamping mechanism 1 completes clamping of the main workpiece 31, the heating coil 21 is located below the main workpiece 31. Through the structure, after the heating mechanism 2 completes preheating of the preheating position, the workpiece 3 can be welded in time above the workpiece 3 by a robot or manually, which plays a role of mutual cooperation and non-interference between preheating and welding, thereby saving adjustment time and improving welding efficiency.

[0033] In the embodiment, the heating coil 21 is provided with a temperature measuring hole 24, and the temperature sensor 23 is fixed directly below the temperature measuring hole 24 to facilitate direct measurement of the surface temperature of the workpiece through the temperature measuring hole 24. Through the structure, the temperature sensor 23 can directly measure the real-time temperature of the workpiece surface, avoiding the influence of the heating coil 21 on the measurement value.

[0034] In the embodiment, the servo walking mechanism can control the horizontal transverse movement of the heating coil 21. In the structure, the induction coil is slidingly connected to a crossbar mechanism, and the servo walking mechanism can control the transverse displacement of the induction coil. The width of the induction coil should be greater than the width of the workpiece 3 to ensure that the to-be-welded point 33 of the workpiece 3 can be preheated. The structure is simple and has good stability.

[0035] Method embodiment:

[0036] A pre-welding preheating welding method is performed by the movable pre-welding preheating device of the device embodiment, comprising the following steps:

[0037] S1, offline programming: according to the to-be-welded point 33 of the workpiece 3, the preheating point of the heating mechanism 2 is set, and the preheating standard temperature is set;

[0038] S2, clamping the workpiece 3: clamp the main piece 31, and then clamp the accessory 32 according to the preset sequence one by one;

[0039] S3, running the preheating program and welding: according to the program, the heating coil 21 is moved to the first to-be-welded point 33 below, and the coil is positioned and heated; after the preheating of the first to-be-welded point 33 is completed, the accessory 32 is welded from above the main piece 31, and the coil is moved to the next to-be-welded point 33 below to preheat, and the preheating and welding process is repeated until all.

[0040] In step S3, whether the temperature of the preheating position reaches the preset preheating temperature value is judged by the temperature sensor 23, so as to accurately control the preheating temperature. The welding step can adopt robot automatic welding, so as to realize automatic welding and improve welding efficiency; or manual welding can be performed to improve the application scene and reduce the equipment cost. Through automatic preheating below, timely welding above, the workpiece 3 need not be frequently transported or manually adjusted, so as to realize efficient and reliable welding.

[0041] Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any skilled person in the art can make many possible changes and modifications to the technical solutions of the present application, or modify equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, shall fall within the scope of protection of the technical solutions of the present application.

Claims

1. A heat source movable pre-welding heating device, which is suitable for multi-point interval welding of attachments on the same main part in steel structure manufacturing, characterized in that: The application relates to a pre-welding heating device with a movable heating source, which comprises a workpiece clamping mechanism (1), a heating mechanism (2), an offline programming system and a central control system; the workpiece clamping mechanism (1) is used for clamping a workpiece (3) to be welded; the offline programming system is provided with the coordinates of welding points (33) of the workpiece (3); the heating mechanism (2) is provided with a movable heat source which is controlled by the central control system to move to the welding points (33) of the workpiece (3) to preheat; The workpiece (3) comprises a main piece (31), the workpiece clamping mechanism (1) comprises a clamping cylinder (11), a pressing cylinder (12) and a workpiece clamping servo motor (13), the servo motor horizontally adjusts the cylinder push rod of the clamping cylinder (11) and the pressing cylinder (12) to fix and clamp the main piece (3); The workpiece (3) further comprises an accessory (32) which is temporarily fixed on the main piece (31) by manual or robotic operation to wait for welding; The heat source is a heating coil (21) which heats the welding points (33) through electromagnetic induction; the heating coil (21) is controlled to displace by a heating servo walking mechanism (22); The offline programming system is provided with a standard temperature of pre-welding preheating; the heating mechanism (2) further comprises a temperature sensor (23) which is used for judging whether the temperature of the welding points (33) reaches the standard or not; When the workpiece clamping mechanism (1) finishes clamping the main piece (31), the heating coil (21) is located below the main piece (31).

2. The heat source movable preheating device for welding according to claim 1, characterized in that: A temperature measuring hole (24) is formed in the heating coil (21), and the temperature sensor (23) is fixed below the temperature measuring hole (24) to directly measure the surface temperature of the workpiece through the temperature measuring hole (24).

3. The heat source movable preheating device before welding according to claim 2, characterized in that: The servo walking mechanism controls the horizontal transverse movement of the heating coil (21).

4. A pre-weld heating welding method characterized by: The pre-welding heating device with a movable heating source is used to perform the following steps: S1, offline programming: according to the welding points (33) of the workpiece (3), the preheating points and the preheating standard temperature of the heating mechanism (2) are set; S2, clamping the workpiece (3): after the main piece (31) is clamped, the accessories (32) are clamped one by one according to a preset sequence; S3, running a preheating program and welding: according to the program, the heating coil (21) is moved to below the first welding point (33), and the coil starts heating after being positioned; after the preheating of the first welding point (33) is completed, the accessories (32) are welded from above the main piece (31), meanwhile, the coil is moved to below the next welding point (33) to preheat, and the preheating and welding process is repeated until all the welding points (33) are completed.

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