CN116586830A - Pre-weld preheating device with movable heat source and pre-weld preheating welding method - Google Patents

Abstract

The invention discloses a pre-welding preheating device with a movable heat source and a pre-welding preheating welding method. The device includes a workpiece clamping mechanism, a heating mechanism and an off-line programming system; the workpiece clamping mechanism is used for clamping workpieces to be welded , the heating mechanism is used to preheat the weld; the off-line programming system is used to preset the preheating position of the heating mechanism, and control the heating mechanism to adjust the preheating position and preheating time of the workpiece. The method is carried out with the above-mentioned device. By presetting the welding seam position and preheating time in the off-line programming system, the heating mechanism moves to the preheating position according to the signal to preheat the welding seam; the workpiece clamping mechanism plays a role in fixing the workpiece body, which is convenient for heating The mechanism locates and tracks the welding seam, so as to realize automatic preheating, improve preheating efficiency, and improve welding quality. Through automatic preheating at the bottom and timely welding at the top, there is no need to frequently move workpieces or manually adjust the preheating position for efficient and reliable welding.

Description

Pre-weld preheating device with movable heat source and pre-weld preheating welding method

technical field

The invention relates to the technical field of pre-weld preheating, in particular to a pre-weld preheating device with a movable heat source and a pre-weld preheating welding method.

Background technique

Steel structure is a commonly used industrial and building component. In order to meet the structural load-bearing requirements of steel structures, there are usually high requirements for the strength of steel structures, and steel structures are generally welded by a large number of steel plates or steel pipes. It is required to ensure a sufficiently high welding quality during the welding process, and defects such as cracks are easily generated during the welding process, which will greatly affect the strength of the steel structure. Usually, in the construction process of the steel structure, the steel needs to be carried out. A certain degree of preheating, so as to avoid the occurrence of defects in the process of welding as much as possible.

In the existing steel structure pre-welding preheating, when there are many points to be welded and the points to be welded are far apart, in order to ensure that each point to be welded is within the ideal temperature range before welding In order to achieve the purpose of preheating, multiple preheating and multiple adjustments are required, which is time-consuming and laborious; and separating preheating and welding will easily lead to heat loss and affect welding quality.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method to solve the problems in the prior art of low preheating efficiency before welding of steel structures, difficulty in adjusting the preheating position, and separate preheating and welding. A pre-weld pre-heating device with a movable heat source and a pre-weld pre-heating welding method with high pre-weld preheating efficiency and timely welding after pre-weld preheating are provided.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A pre-weld preheating device with a movable heat source, comprising a workpiece clamping mechanism, a heating mechanism, an off-line programming system and a central control system; the workpiece clamping mechanism is used to clamp workpieces to be welded; the off-line programming system presets There are coordinates of the workpiece to be welded; the heating mechanism is provided with a movable heat source, which moves to the workpiece to be welded under the control of the central control system for preheating.

As a further improvement on the above scheme:

The workpiece includes a main part, and the workpiece clamping mechanism includes a jacking cylinder, a pressing cylinder and a workpiece clamping servo motor, and the servo motor horizontally and laterally adjusts the cylinder push rods of the jacking cylinder and the pressing cylinder to The parts are fixed and clamped.

The workpiece also includes accessories, and the accessories are temporarily fixed on the main part by manual or robot to wait for welding.

The heat source is a heating coil that heats the spot to be welded by electromagnetic induction; the displacement of the heating coil is controlled by a heating servo traveling mechanism.

The off-line programming system is preset with a pre-welding preheating temperature up to the standard; the heating mechanism also includes a temperature sensor for judging whether the temperature of the point to be welded reaches the standard.

After the workpiece clamping mechanism finishes clamping the main part, the heating coil is located under the main part.

A temperature-measuring hole is provided on the heating coil, and the temperature sensor is fixed directly below the temperature-measuring hole, which is convenient for directly measuring the surface temperature of the workpiece through the temperature-measuring hole.

The servo traveling mechanism controls the heating coil to move horizontally and laterally.

A pre-weld preheating welding method is carried out with the above-mentioned pre-weld preheating device with movable heat source, comprising the following steps:

S1. Offline programming: according to the position of the workpiece to be welded, set the preheating position of the heating mechanism and the preheating temperature;

S2. Clamp the workpiece: clamp the main part, and then clamp the accessories one by one according to the preset order;

S3. Run the preheating program and welding: According to the program setting, the heating coil moves to the bottom of the first spot to be welded, and starts heating after the coil is in place; The accessories are welded, while the coil moves to the next point to be welded for preheating, and the preheating welding process is repeated until all are completed.

Compared with the prior art, the present invention has the advantages of:

The present invention proposes a pre-weld preheating device with a movable heat source and a pre-weld preheating welding method. By presetting the position of the point to be welded and the preheating time in the off-line programming system, the heating mechanism moves to The preheating position is used to preheat the welding point; the workpiece clamping mechanism fixes the workpiece body, which facilitates positioning and tracking of the welding point with the heating mechanism, so as to realize automatic preheating, improve preheating efficiency, and ensure subsequent welding quality. Through the welding method of automatic preheating at the bottom and timely welding at the top, there is no need to frequently move the workpiece or manually adjust the preheating position for efficient and reliable welding.

Description of drawings

Fig. 1 is a schematic perspective view of the structure of a pre-weld preheating device with a movable heat source in an embodiment of the present invention.

Fig. 2 is a schematic top view of the structure of a pre-weld preheating device with a movable heat source in an embodiment of the present invention.

Fig. 3 is a schematic perspective view of the structure of a pre-weld preheating device with a movable heat source in an embodiment of the present invention and a workpiece.

Fig. 4 is a schematic front view of the structure of a pre-weld preheating device with a movable heat source and a workpiece in an embodiment of the present invention.

Each label in the figure means:

1. Workpiece clamping mechanism; 11. Jacking cylinder; 12. Pressing cylinder; 13. Servo motor for workpiece clamping; 2. Heating mechanism; 21. Heating coil; 22. Heating servo walking mechanism; 23. Temperature sensor; 24 , temperature measuring hole; 3, workpiece; 31, main part; 32, accessories; 33, to-be-welded point.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figures 1 to 4 show a pre-welding preheating device with a movable heat source of the present invention, including a workpiece clamping mechanism 1, a heating mechanism 2, an off-line programming system and a central control system; the workpiece clamping mechanism 1 is used for loading Clamp the workpiece 3 to be welded; the offline programming system presets the coordinates of the workpiece 3 to be welded 33; the heating mechanism 2 is equipped with a movable heat source, which moves to the workpiece 3 to be welded at 33 under the control of the central control system. warm up. In this structure, by presetting the position and preheating time of the spot 33 to be welded in the off-line programming system, the heating mechanism 2 is moved to the preheating position according to the signal to preheat the spot 33 to be welded; the workpiece clamping mechanism 1 The main body of the workpiece 3 is fixed, and it is convenient to cooperate with the heating mechanism 2 to locate and track the spot 33 to be welded, so as to realize automatic preheating, improve preheating efficiency, and improve welding quality.

In this embodiment, the workpiece 3 includes a main part 31 and an accessory 32. The workpiece clamping mechanism 1 includes a clamping cylinder 11, a compression cylinder 12, and a workpiece clamping servo motor 13. The servo motor horizontally and laterally adjusts the clamping cylinder 11 and the compression cylinder. The cylinder push rod of the cylinder 12 is used for fixing and clamping the main part 31 . In this structure, the clamping cylinder 11 clamps the workpiece 3 laterally, the clamping cylinder 12 clamps the main part 31 longitudinally, and the accessory 32 can be fixed by a gripper robot or other methods.

In this embodiment, the heat source is that the heating coil 21 heats the spot 33 to be welded by electromagnetic induction; In this structure, the heating coil 21 is used to preheat the spot 33 to be welded by electromagnetic induction, which is more efficient, safe and environmentally friendly compared to heating with an open flame. The preset signal of the off-line programming system is received by heating the servo traveling mechanism 22, Controlling the displacement and heating time of the heating coil 21 enables the heating mechanism 2 to preheat the points 33 to be welded at different positions to reach the required preheating temperature.

In this embodiment, the off-line programming system is preset with the preheating temperature before welding, and the heating mechanism 2 also includes a temperature sensor 23. The temperature sensor 23 is connected to the off-line programming system signal, and is used to judge whether the temperature of the spot 33 to be welded reaches the standard. . In this structure, the temperature sensor 23 is set to monitor whether the preheating position reaches the preset temperature, and if it does not reach the preset temperature, the off-line programming system transmits a signal to the heating servo running mechanism 22 to prolong the preheating time to precisely control the preheating temperature and ensure subsequent welding quality.

In this embodiment, after the workpiece clamping mechanism 1 finishes clamping the main part 31 , the heating coil 21 is located below the main part 31 . Through this structure, after the heating mechanism 2 completes the preheating of the preheating position, the workpiece 3 can be welded on the top of the workpiece 3 in time by a robot or manually, so that the preheating and welding cooperate with each other without interfering with each other. The chief mate saves adjustment time and improves welding efficiency.

In this 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, so as to directly measure the surface temperature of the workpiece through the temperature measuring hole 24. Through this structure, the temperature sensor 23 can directly measure the real-time temperature of the surface of the workpiece, avoiding the influence of the heating coil 21 on the measured value.

In this embodiment, the servo traveling mechanism can control the heating coil 21 to move horizontally and laterally. In this structure, the induction coil is slidably connected to a horizontal bar mechanism, and its lateral displacement can be controlled by the servo traveling mechanism, and the width of the induction coil should be greater than the width of the workpiece 3 to ensure that the welding points 33 of the workpiece 3 can be controlled. It produces preheating effect, simple structure and good stability.

Method example:

A pre-weld preheating welding method is carried out with a pre-weld preheating device with a movable heat source in the device embodiment, comprising the following steps:

S1. Off-line programming: according to the to-be-welded point 33 of the workpiece 3, set the preheating hot spot and preheating temperature of the heating mechanism 2;

S2. Clamp the workpiece 3: clamp the main part 31, and then clamp the accessories 32 one by one according to the preset order;

S3, run the preheating program and welding: According to the program setting, the heating coil 21 moves to the bottom of the first welding point 33, and starts heating after the coil is in place; after completing the preheating of the first welding point 33, start from the main The attachment 32 is welded above the piece 31, while the coil moves to the next to-be-welded point 33 for preheating, and the preheating welding process is repeated until all are completed.

In step S3, the temperature sensor 23 is used to judge whether the temperature of the preheating position reaches the preset preheating temperature value, so as to precisely control the preheating temperature. The welding step can be automatically welded by robots to automate welding and improve welding efficiency; it can also be welded manually to improve applicable scenarios and reduce equipment costs. Through automatic preheating at the bottom and timely welding at the top, there is no need to frequently move workpieces or manually adjust the preheating position to achieve efficient and reliable welding.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent implementation of equivalent changes example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (9)

1. A preheating device before welding that heat source is movable, its characterized in that: the device comprises a workpiece clamping mechanism (1), a heating mechanism (2), an off-line 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 pre-provided with coordinates of points to be welded (33) of the workpiece (3); the heating mechanism (2) is provided with a movable heat source, and the heat source moves to a point to be welded (33) of the workpiece (3) to be preheated under the control of the central control system.

2. The pre-weld preheating apparatus with removable heat source according to claim 1, wherein: the workpiece clamping mechanism is characterized in that the workpiece (3) comprises a main part (31), the workpiece clamping mechanism (1) comprises a jacking cylinder (11), a pressing cylinder (12) and a workpiece clamping servo motor (13), and a cylinder push rod of the jacking cylinder (11) and the pressing cylinder (12) is horizontally and transversely adjusted by the servo motor to be used for fixedly clamping the main part (3).

3. The pre-weld preheating apparatus with removable heat source according to claim 2, wherein: the workpiece (3) further comprises an accessory (32), the accessory (32) being temporarily fixed to the main part (31) by means of a manual or robotic means awaiting welding.

4. The pre-weld preheating apparatus with removable heat source according to claim 1, wherein: the heat source is a heating coil (21) for heating the point to be welded (33) through electromagnetic induction; the heating coil (21) is controlled to displace by a heating servo travelling mechanism (22).

5. The pre-weld preheating apparatus having a removable heat source according to claim 4, wherein: the off-line programming system is pre-set with the pre-welding preheating standard reaching temperature; the heating mechanism (2) further comprises a temperature sensor (23) for judging whether the temperature of the point to be welded (33) reaches the standard.

6. The pre-weld preheating apparatus having a removable heat source according to claim 5, wherein: after the workpiece clamping mechanism (1) is used for clamping the main part (31), the heating coil (21) is positioned below the main part (31).

7. The pre-weld preheating apparatus having a removable heat source according to claim 6, wherein: the heating coil (21) is provided with a temperature measuring hole (24), and the temperature sensor (23) is fixed under the temperature measuring hole (24) so as to conveniently and directly measure the surface temperature of the workpiece through the temperature measuring hole (24).

8. The pre-weld preheating apparatus having a removable heat source according to claim 7, wherein: the servo travelling mechanism controls the heating coil (21) to horizontally and transversely move.

9. A pre-welding preheating welding method is characterized in that: use of a pre-weld preheating apparatus movable from a heat source according to any of claims 1 to 8, comprising the steps of:

s1, offline programming: according to the point to be welded (33) of the workpiece (3), setting a preheating point position and a preheating standard reaching temperature of the heating mechanism (2);

s2, clamping a workpiece (3): clamping the main parts (31), and then clamping the accessories (32) one by one according to a preset sequence;

s3, running a preheating program and welding: setting a heating coil (21) according to a program, moving to the position below a first point to be welded (33), and starting heating after the coil is in place; after the preheating of the first point to be welded (33) is completed, the accessory (32) is welded from the upper part of the main part (31), the coil is moved to the lower part of the next point to be welded (33) to be preheated, and the preheating welding process is repeated until all the points to be welded are completed.