Preheating device used before welding of metal fittings

Abstract

The utility model discloses a preheating device before welding of metal fittings, which comprises a truss and a sliding table installed at the top end of the truss in a sliding mode, the bottom end of the truss is provided with a lead screw transverse moving assembly used for driving the sliding table to slide in the X-axis direction, and one side of the surface of the sliding table is provided with an electromagnetic heating coil through a suspension structure. An inclined beam extending upwards in an inclined mode is fixed to the outer wall of one side of the truss, and a four-jaw chuck is rotationally installed on the outer wall of the side, close to the sliding table, of the inclined beam. The rod-shaped metal piece is fixed and far away from the ground through the truss, the oblique beam and the four-jaw chuck, heat absorption of the ground to the bottom of the metal piece is avoided, it is ensured that each part of the metal piece can evenly receive heat, and therefore the preheating effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal welding pretreatment technical field, concretely is a kind of preheating device before metal fittings welding. BACKGROUND

[0002] The main role of preheater in metal fittings welding is to reduce welding cracks, thermal stress and deformation caused by excessive temperature difference by heating workpiece. It can uniformly improve the temperature of workpiece, reduce the cooling speed in the welding process, prevent the excessive temperature difference between weld zone and base material, thereby reducing the risk of cracks, especially in heavy or high hardness metal welding, the structure of preheater is usually composed of heating element, temperature control system, insulating material and other parts. Heating element is its core, common ones are electric heating wire, infrared heater or gas burner, different heating methods are selected according to the size and material of workpiece. Temperature control system monitors the temperature of workpiece surface through thermocouple or sensor to ensure the accuracy and stability of heating process, and insulating material is used to reduce heat loss and improve heating efficiency. For example, the preheating device before metal piece welding disclosed in the authorized announcement No. CN219402940U includes a cross pipe and a handle, the handle is installed at the lower end of the cross pipe, the cross pipe is used for hand holding by user, the cross pipe and the handle are both tubular structure, the cross pipe is provided with a coil inside, and the preheating of aluminum alloy parts before welding can be realized by setting coil and electromagnetic induction heating principle. However, the device is held and moved to the metal fittings to be welded by worker during use, and for long, large and heavy rod-shaped metal parts, the rod-shaped metal part is placed on the ground, and the combination of rod-shaped metal part and ground is difficult to be preheated, that is, the part of rod-shaped metal part in contact with ground will be blocked, and heat radiation cannot directly act on these areas, resulting in that the temperature of this part is always low, which affects the uniformity of preheating. SUMMARY

[0003] The utility model aims at providing a kind of preheating device before metal fittings welding, four jaw chuck is clamped to rod-shaped metal part and makes it away from ground, screw rod transverse assembly makes electromagnetic heating coil move to the place to be heated of rod-shaped metal part, to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of preheating device before metal fitting welding, including truss and the sliding platform of truss top end sliding installation, the bottom of the truss is provided with the screw cross-moving assembly for driving sliding platform to slide in X axis direction, the side of the surface of sliding platform is equipped with electromagnetic heating coil by suspension structure, the side outer wall of the truss is fixed with the inclined beam extending upwardly, four jaw chuck is rotatably installed on the side outer wall of the inclined beam close to sliding platform, PLC control panel is installed on the side outer wall of the truss, and the output end of PLC control panel is electrically connected with the input end of screw cross-moving assembly and electromagnetic heating coil respectively.

[0005] Preferably, the screw cross-moving assembly includes a screw rod monomer rotatably installed inside the truss, a nut pair threadedly installed at one end of the surface of the screw rod monomer, and a servo motor installed on the side outer wall of the truss for driving the screw rod monomer to rotate.

[0006] Preferably, the top end of the nut pair is fixedly connected with the bottom end of the sliding platform, and the upper surface of the truss is provided with a hollow groove for the nut pair to slide.

[0007] Preferably, the suspension structure is a right-angle hollow frame fixed on one side of the surface of the sliding platform, the electromagnetic heating coil is installed on the side outer wall of the right-angle hollow frame, and the central axis of the electromagnetic heating coil coincides with the central axis of the four jaw chuck.

[0008] Preferably, a driven shaft is rotatably installed inside the inclined beam, and one end of the driven shaft is fixedly connected with the side outer wall of the four jaw chuck.

[0009] Preferably, the other end of the driven shaft penetrates to the outside of the inclined beam and is installed with a pulley transmission structure in power connection with the screw cross-moving assembly.

[0010] Compared with the prior art, the preheating device before metal fitting welding has the following advantages: through the above steps, the truss, screw cross-moving assembly, sliding platform, electromagnetic heating coil, pulley transmission structure, four jaw chuck and PLC control panel cooperate with each other to efficiently and accurately complete the preheating process of the rod-shaped metal piece, the rod-shaped metal piece is fixed by the four jaw chuck and kept away from the ground, the heat absorption of the ground on the bottom of the metal piece is avoided, and each part of the metal piece can uniformly receive heat, thereby improving the preheating effect.

[0011] When large area of metal rod is preheated, the screw cross-moving assembly can drive the four-jaw chuck and the rod to rotate through the belt wheel transmission structure, and the self-rotation process ensures that each surface of the workpiece is fully exposed to the heating area within the predetermined time, so that more uniform preheating is realized, which not only helps to reduce the local temperature difference, but also reduces the unevenness of thermal stress during welding, thereby avoiding cracks and deformation. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a front view structural schematic diagram of the utility model;

[0013] Figure 2 It is a side view structural schematic diagram of the utility model;

[0014] Figure 3 It is a three-dimensional structural schematic diagram of the utility model Figure 1 ;

[0015] Figure 4 It is a three-dimensional structural schematic diagram of the utility model Figure 2 ;

[0016] Figure 5 It is a three-dimensional structural schematic diagram of the utility model Figure 3 .

[0017] In the figure: 1, truss; 2, slide table; 3, screw cross-moving assembly; 301, screw single body; 302, nut pair; 303, servo motor; 4, right-angle hollow frame; 5, electromagnetic heating coil; 6, inclined beam; 7, driven shaft; 8, four-jaw chuck; 9, belt wheel transmission structure; 10, PLC control panel. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0019] Please refer to Figures 1-5The utility model provides a kind of preheating device before metal fitting welding, including truss 1 and the sliding platform 2 of truss 1 top end sliding installation, the bottom of truss 1 is provided with the screw traverse assembly 3 for driving sliding platform 2 to slide in X axis direction, one side of sliding platform 2 surface is equipped with electromagnetic heating coil 5 by suspension structure, the outer wall of one side of truss 1 is fixed with the inclined beam 6 extending obliquely upwards, four jaw chuck 8 is rotatably installed on the outer wall of one side of inclined beam 6 close to sliding platform 2, PLC control panel 10 is installed on the outer wall of one side of truss 1, and the output of PLC control panel 10 is electrically connected with the input of screw traverse assembly 3 and electromagnetic heating coil 5 respectively;

[0020] Screw traverse assembly 3 includes screw rod monomer 301 rotatably installed in truss 1, nut pair 302 installed at one end of screw rod monomer 301 surface screw thread and servo motor 303 for driving screw rod monomer 301 rotation installed on the outer wall of one side of truss 1, the top of nut pair 302 is fixedly connected with the bottom of sliding platform 2, and the upper surface of truss 1 is provided with hollow groove for the sliding of nut pair 302;

[0021] Suspension structure is right-angle hollow frame 4 fixed on one side of sliding platform 2 surface, electromagnetic heating coil 5 is installed on the outer wall of one side of right-angle hollow frame 4, and the central axis of electromagnetic heating coil 5 coincides with the central axis of four jaw chuck 8, and screw rod monomer 301 is driven to rotate by servo motor 303, then screw rod monomer 301 drives nut pair 302 and sliding platform 2 to slide in the extension direction of truss 1, so that sliding platform 2, right-angle hollow frame 4 and electromagnetic heating coil 5 change X axis position, so that electromagnetic heating coil 5 can be quickly moved to the position where metal piece needs to be preheated;

[0022] Driven shaft 7 is rotatably installed in the inside of inclined beam 6, one end of driven shaft 7 is fixedly connected with the outer wall of one side of four jaw chuck 8, the other end of driven shaft 7 penetrates to the outside of inclined beam 6 and is equipped with pulley transmission structure 9 in power connection with screw traverse assembly 3, when metal piece is preheated greatly, servo motor 303 works according to the direction, speed, angle, response time set by PLC control panel 10, i.e. the moving direction of sliding platform 2, right-angle hollow frame 4 and electromagnetic heating coil 5 is controlled, at this time, the rotary power of screw rod monomer 301 is transmitted to driven shaft 7 through pulley transmission structure 9, four jaw chuck 8 and metal piece are driven to rotate by driven shaft 7, to ensure that metal piece is further uniformly heated in the heating process.

[0023] In use, the embodiment of the present application first places the rod-shaped metal piece in the center of the four-jaw chuck 8. The four-jaw chuck 8 is designed to firmly clamp rod-shaped metal pieces of different diameters and lengths and ensure that the rod-shaped metal piece does not move during processing. At this time, the rod-shaped metal piece is aligned with the center of the electromagnetic heating coil 5 and the four-jaw chuck 8, so that subsequent rotation and heating can be evenly performed. After the metal piece is clamped, the worker turns on the lead screw cross slide assembly 3 through the PLC control panel 10 to work, and the lead screw cross slide assembly 3 drives the electromagnetic heating coil 5 to move to the area to be heated of the metal piece. After the electromagnetic heating coil 5 reaches the predetermined position, the electromagnetic heating coil 5 rapidly heats the surface of the metal piece through electromagnetic induction principle. During this process, the worker can input the required heating time through the PLC control panel 10. When the preset heating time is reached, the electromagnetic heating coil 5 will automatically turn off to ensure that the metal piece will not be damaged due to overheating. After heating is completed, the clamping of the metal piece by the right-angle hollow frame 4 is released. At this time, the metal piece still maintains in the appropriate temperature range and can be directly welded. If cooling is required, the worker can choose to slowly cool the metal piece or naturally cool it under safe conditions to prevent thermal stress caused by sudden temperature drop.

Claims

1. A preheating device for metal parts before welding, characterized by: The invention comprises a truss (1) and a slide (2) slidably mounted on the top of the truss (1); a screw transverse movement assembly (3) for driving the slide (2) to slide in the X-axis direction is provided at the bottom of the truss (1); an electromagnetic heating coil (5) is installed on one side of the surface of the slide (2) through a suspension structure; an inclined beam (6) extending upward is fixed on one side outer wall of the truss (1); a four-claw chuck (8) is rotatably mounted on the outer wall of the side of the inclined beam (6) close to the slide (2); a PLC control panel (10) is installed on one side outer wall of the truss (1); and the output end of the PLC control panel (10) is electrically connected to the screw transverse movement assembly (3) and the input end of the electromagnetic heating coil (5) respectively.

2. The preheating device for metal parts before welding according to claim 1, characterized in that: The screw rod transverse movement assembly (3) comprises a screw rod unit (301) rotatably mounted inside the truss (1), a nut pair (302) mounted at a threaded portion on one end of the surface of the screw rod unit (301), and a servo motor (303) mounted on an outer wall of one side of the truss (1) for driving the screw rod unit (301) to rotate.

3. The preheating device for metal parts before welding according to claim 2, characterized in that: The top end of the nut pair (302) is fixedly connected to the bottom end of the slide (2), and the upper surface of the truss (1) is provided with a hollow groove for the nut pair (302) to slide.

4. The preheating device for metal parts before welding according to claim 1, characterized in that: The suspension structure is a right-angled hollow frame (4) fixed on one side of the surface of the slide (2); the electromagnetic heating coil (5) is installed on one side outer wall of the right-angled hollow frame (4); and the central axis of the electromagnetic heating coil (5) coincides with the central axis of the four-jaw chuck (8).

5. The preheating device for metal parts before welding according to claim 1, characterized in that: A driven shaft (7) is rotatably mounted inside the inclined beam (6), and one end of the driven shaft (7) is fixedly connected to an outer wall of one side of the four-jaw chuck (8).

6. The preheating device for metal parts before welding according to claim 5, characterized in that: The other end of the driven shaft (7) passes through the outside of the inclined beam (6) and is installed with a pulley transmission structure (9) that maintains power connection with the screw rod transverse movement assembly (3).

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