Equidistant resistance spot welding device for metal plate machining

Abstract

The invention relates to the technical field of resistance spot welding devices, in particular to an equidistant resistance spot welding device for metal plate machining, and solves the problem that a plate is easy to bend due to the fact that the periphery of an electric welding part is not limited when resistance spot welding is carried out on the plate. An equidistant resistance spot welding device for metal plate machining comprises an equipment body, a hydraulic cylinder is fixed to the top of the equipment body, a second electric telescopic rod is fixed to the front end of the equipment body, and a piston rod of the hydraulic cylinder penetrates through the top of the equipment body and is fixedly provided with a first electric telescopic rod; and the end parts of the piston rods of the first electric telescopic rod and the insulating protective sleeve are penetrated by the insulating protective sleeve. After the two electric welding electrode bars make contact with a to-be-welded plate, the two insulating protective sleeves are attached to the plate, the plate is pressurized up and down, and therefore the plate is prevented from deforming due to electric heating in the resistance spot welding process, and the quality of the plate after resistance spot welding is completed is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of resistance spot welding devices, and specifically to an equidistant resistance spot welding device for metal plate processing. Background Technique

[0002] Resistance electric welding, also known as resistance welding, refers to a method of locally heating the workpiece by using the resistance heat generated when the current passes through the workpiece and the contact area, and at the same time applying pressure for welding. During welding, no filler metal is required, the productivity is high, the deformation of the workpiece is small, and it is easy to achieve automation. The working principle of resistance welding is to heat the workpiece to the melting or plastic state by using the resistance heat effect generated when the current flows through the contact surface and adjacent areas of the workpiece, so as to form a metal bond. There are mainly four resistance welding methods, namely spot welding, seam welding, projection welding, and butt welding.

[0003] However, when the existing plates are subjected to resistance spot welding, the plates are prone to bending due to the lack of restriction around the welding area; therefore, it does not meet the existing requirements. For this reason, we propose an equidistant resistance spot welding device for metal plate processing. Summary of the Invention

[0004] The purpose of the present invention is to provide an equidistant resistance spot welding device for metal plate processing, so as to solve the problems such as the plates are prone to bending due to the lack of restriction around the welding area as mentioned in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An equidistant resistance spot welding device for metal plate processing, including an equipment body. A hydraulic cylinder is fixed on the top of the equipment body, and a second electric telescopic rod is fixed at the front end of the equipment body. The piston rod of the hydraulic cylinder penetrates through the top of the equipment body and is fixed with a first electric telescopic rod. The piston rod ends of the first electric telescopic rod and the insulating protective sleeve are both installed through the insulating protective sleeve. Electric welding electrode rods are inserted at the ends of the two insulating protective sleeves close to each other. The other end of the insulating protective sleeve penetrates and is fixed with a connecting wire. One end of the connecting wire is fixed to the electric welding electrode rod, and the other end of the connecting wire extends into the equipment body. A positioning and pressing structure is fixed on the front surface of the equipment body. The positioning and pressing structure includes a cooling water tank, which is fixedly connected to the equipment body. Two circulating cooling micro water pumps are fixed on one side of the cooling water tank. Two cooling return water pipes penetrate and are fixed at the other end of the cooling water tank. The output end of the circulating cooling micro water pump is fixed with a cooling water outlet pipe. A positioning ring is fixed between the ends of the cooling water outlet pipe and the cooling return water pipe close to each other. A flow velocity sensor is installed at the end of the cooling water outlet pipe connected to the positioning ring. Two elastic connecting rods are fixed on the outer surface of the positioning ring, and one end of the elastic connecting rod is fixed outside the insulating protective sleeve

[0006] Preferably, a cooling annular water channel is provided inside the positioning ring, and the end portions of the cooling water outlet pipe and the cooling water return pipe connected to the positioning ring penetrate through the positioning ring housing and extend to the inside of the cooling annular water channel.

[0007] Preferably, a plurality of temperature sensors are embedded on the surface of the positioning ring in contact with the plate, and the temperature sensors are distributed in a circular array around the axis of the positioning ring.

[0008] Preferably, a moving mechanism is further fixedly installed on the front surface of the equipment body. The moving mechanism includes two symmetrically distributed fixed rods. The two fixed rods are respectively located on both sides of the equipment body and are fixed to the equipment body. A moving motor is fixed to the end of one of the fixed rods.

[0009] Preferably, an adjusting lead screw is rotatably installed between the two fixed rods. The end of the adjusting lead screw penetrates through the fixed rod and is rotatably connected to the fixed rod through a roller bearing. The output shaft end of the moving motor is fixed to one end of the adjusting lead screw.

[0010] Preferably, two adjusting sliders are provided on the outer side of the adjusting lead screw. The two adjusting sliders are penetrated by the adjusting lead screw and are in threaded transmission with the adjusting lead screw. A moving support frame is fixed to the outer side of the adjusting slider.

[0011] Preferably, a bottom support plate is fixed to the tops of the two moving support frames. A pressing plate is provided above the bottom support plate. Both the bottom support plate and the pressing plate are of U-shaped structures.

[0012] Preferably, an L-shaped support frame is fixed to the outer side of the moving support frame. A reinforcing electric telescopic rod is fixed to the upper surface of the L-shaped support frame. The piston rod of the reinforcing electric telescopic rod is fixed to the bottom of the pressing plate.

[0013] Preferably, a guiding hole is provided through the bottom end of the adjusting slider, and a guiding rod is inserted into the inner sides of the two guiding holes.

[0014] Preferably, the guiding rod is parallel to the adjusting lead screw, and both ends of the guiding rod penetrate through the two fixed rods and are fixed to the fixed rods.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. After the two welding electrode rods are in contact with the plate to be welded, the present invention uses the two insulating protective sleeves to fit with the plate and apply upward and downward pressure to the plate, thereby preventing the plate from deforming due to electrothermal energy during the resistance spot welding process, and thus ensuring the quality of the plate after the resistance spot welding is completed. 2. The present invention monitors the temperature of the sheet during the resistance spot welding process by using a temperature sensor, and controls the flow of cooling water inside the cooling outlet pipe, the cooling annular water channel, and the cooling return pipe. At the same time, according to the thickness of different sheets, the flow rate sensor controls the flow rate of the cooling water to control the temperature rise of the two sheets, so as to ensure that the temperatures of the two sheets rise synchronously and ensure the welding quality at the welding point of the sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the whole of the present invention; Figure 2 is a schematic connection diagram of the positioning and pressing structure and the equipment body of the present invention; Figure 3 is a schematic structural diagram of the moving mechanism of the present invention; Figure 4 is a schematic structural diagram of the positioning and pressing structure of the present invention; Figure 5 is Figure 2 an enlarged structural view of part A in Figure 6 is a schematic structural diagram of the positioning ring of the present invention; Figure 7 is a schematic connection diagram of the bottom support plate and the pressing plate of the present invention; Figure 8 is Figure 3 an enlarged structural view of part B in

[0017] In the figure: 1, equipment body; 2, parameter control host; 3, hydraulic cylinder; 4, first electric telescopic rod; 5, insulation protection sleeve; 6, positioning and pressing structure; 601, cooling water tank; 602, circulating cooling micro water pump; 603, cooling outlet pipe; 604, flow rate sensor; 605, positioning ring; 606, elastic connecting rod; 607, cooling return pipe; 608, cooling annular water channel; 609, temperature sensor; 7, moving mechanism; 701, fixed rod; 702, moving motor; 703, adjusting lead screw; 704, moving support frame; 705, bottom support plate; 706, pressing plate; 707, reinforcing electric telescopic rod; 708, adjusting slider; 709, guide rod; 8, welding electrode bar; 9, second electric telescopic rod; 10, connecting wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0019] As Figure 1As shown in the figure, an equidistant resistance spot welding device for metal plate processing includes an equipment body 1. A hydraulic cylinder 3 is fixed on the top of the equipment body 1, and a second electric telescopic rod 9 is fixed at the front end of the equipment body 1. The piston rod of the hydraulic cylinder 3 penetrates through the top of the equipment body 1 and is fixed with a first electric telescopic rod 4. The piston rod ends of the first electric telescopic rod 4 and the insulating protective sleeve 5 are both penetrated and installed with an insulating protective sleeve 5. Electric welding electrode rods 8 are inserted at the ends of the two insulating protective sleeves 5 close to each other. The other end of the insulating protective sleeve 5 is penetrated and fixed with a connecting wire 10. One end of the connecting wire 10 is fixed to the electric welding electrode rod 8, and the other end of the connecting wire 10 extends into the equipment body 1.

[0020] As Figure 2 , Figures 3 to 6 shown in the figure, a positioning and pressing structure 6 is fixed on the front surface of the equipment body 1. The positioning and pressing structure 6 includes a cooling water tank 601. The cooling water tank 601 is fixedly connected to the equipment body 1. Two circulating cooling micro water pumps 602 are fixed on one side of the cooling water tank 601. Two cooling return water pipes 607 are penetrated and fixed at the other end of the cooling water tank 601. The output end of the circulating cooling micro water pump 602 is fixed with a cooling water outlet pipe 603. A positioning ring 605 is fixed between the ends of the cooling water outlet pipe 603 and the cooling return water pipe 607 close to each other. A flow velocity sensor 604 is installed at the end of the cooling water outlet pipe 603 connected to the positioning ring 605. Two elastic connecting rods 606 are fixed on the outer surface of the positioning ring 605. One end of the elastic connecting rod 606 is fixed outside the insulating protective sleeve 5. After the two electric welding electrode rods 8 are in contact with the plate to be welded, the two insulating protective sleeves 5 are used to fit with the plate to apply upward and downward pressure to the plate, so as to prevent the plate from deforming due to electrothermal during the resistance spot welding process.

[0021] A cooling annular water channel 608 is arranged inside the positioning ring 605. The ends of the cooling water outlet pipe 603 and the cooling return water pipe 607 connected to the positioning ring 605 penetrate through the shell of the positioning ring 605 and extend to the inner side of the cooling annular water channel 608. A plurality of temperature sensors 609 are inlaid on the surface of the positioning ring 605 in contact with the plate. The temperature sensors 609 are distributed in a circular array around the axis of the positioning ring 605. The temperature sensors 609 are used to monitor the temperature of the plate during the resistance spot welding process, and the temperature rise of the two plates is controlled by the flow of cooling water inside the cooling water outlet pipe 603, the cooling annular water channel 608 and the cooling return water pipe 607.

[0022] As Figure 3 , Figure 7 and Figure 8As shown in the figure, a moving mechanism 7 is also fixedly installed on the front surface of the equipment body 1. The moving mechanism 7 includes two symmetrically distributed fixed rods 701. The two fixed rods 701 are respectively located on both sides of the equipment body 1 and are fixed to the equipment body 1. A moving motor 702 is fixed to the end of one of the fixed rods 701. An adjusting screw rod 703 is rotatably installed between the two fixed rods 701. The end of the adjusting screw rod 703 penetrates the fixed rod 701 and is rotatably connected to the fixed rod 701 through a roller bearing. The output shaft end of the moving motor 702 is fixed to one end of the adjusting screw rod 703. Two adjusting sliders 708 are arranged on the outer side of the adjusting screw rod 703. The two adjusting sliders 708 are penetrated by the adjusting screw rod 703 and are in threaded transmission with the adjusting screw rod 703. A moving support frame 704 is fixed to the outer side of the adjusting slider 708. By driving the adjusting screw rod 703 to rotate with the moving motor 702, the adjusting slider 708 drives the moving support frame 704, the bottom support plate 705, and the pressing plate 706 to linearly move along the length direction of the adjusting screw rod 703, so as to control the plates to be welded to move at equal distances, realizing equal-distance resistance spot welding of the plates.

[0023] The top ends of the two moving support frames 704 are fixed with a bottom support plate 705. A pressing plate 706 is arranged above the bottom support plate 705. Both the bottom support plate 705 and the pressing plate 706 are of U-shaped structures. An L-shaped support frame is fixed to the outer side of the moving support frame 704. A reinforcing electric telescopic rod 707 is fixed to the upper surface of the L-shaped support frame. The piston rod of the reinforcing electric telescopic rod 707 is fixed to the bottom of the pressing plate 706. By driving the pressing plate 706 to move downward with the reinforcing electric telescopic rod 707, the pressing plate 706 and the bottom support plate 705 clamp the two plates to be welded, so as to ensure that the plates will not shift in position during the welding process.

[0024] A guide hole is penetrated through the bottom end of the adjusting slider 708. A guide rod 709 is inserted into the inner sides of the two guide holes. The guide rod 709 is parallel to the adjusting screw rod 703, and both ends of the guide rod 709 penetrate the two fixed rods 701 and are fixed to the fixed rods 701. The movement mode of the adjusting slider 708 is restricted by the guide rod 709, ensuring that the adjusting slider 708 can only move along the length direction of the adjusting screw rod 703, and the adjusting slider 708 will not rotate with the adjusting screw rod 703 when the adjusting screw rod 703 rotates.

[0025] Working principle: When performing resistance spot welding on plates, first stack the two plates to be welded and place them between the bottom support plate 705 and the pressing plate 706. At this time, turn on the power supply of the device and start it. After power-on, the reinforcement electric telescopic rod 707 starts and drives the pressing plate 706 to move downward. The pressing plate 706 presses downward on the two stacked plates to ensure that the two plates are closely attached, and the plate located below contacts the electric welding electrode rod 8 located below. The positioning ring 605 outside this electric welding electrode rod 8 is squeezed by the plate, and the elastic connecting rod 606 bends elastically. The bent elastic connecting rod 606 applies a pressure pointing to the plate to the positioning ring 605; Then the hydraulic cylinder 3 starts and drives the first electric telescopic rod 4, the insulation protection sleeve 5, and the electric welding electrode rod 8 to move, so that the electric welding electrode rod 8 located above the plate moves downward until this electric welding electrode rod 8 contacts the plate. At the same time, the positioning ring 605 outside this electric welding electrode rod 8 is squeezed by the plate, and the elastic connecting rod 606 bends elastically. The bent elastic connecting rod 606 applies a pressure pointing to the plate to the positioning ring 605. Subsequently, current enters the electric welding electrode rod 8 connected to this connecting wire 10 through one of the connecting wires 10, and the current passes through the two plates and reaches the other electric welding electrode rod 8. During this process, the contact part of the plates is heated and melted. During this process, the two positioning rings 605 always keep squeezing the plates, so as to prevent the plates from deforming due to electrothermal during the resistance spot welding process, thereby ensuring the quality of the plates after the resistance spot welding is completed; During the process of resistance spot welding of the plates by the two electric welding electrode rods 8, the temperature sensor 609 always monitors the internal temperature of the contacting plates. The temperature sensor 609 feeds back the detected temperature to the parameter control host 2. The parameter control host 2 receives the data and compares it, and then sends a start signal to the two circulating cooling micro water pumps 602, controls the power of the two circulating cooling micro water pumps 602, thereby controlling the flow rate of the cooling annular water channels 608 inside the two positioning rings 605, and controls the temperature rise of the two plates by the flow rate of the cooling annular water channels 608, so as to ensure that the temperatures of the two plates rise synchronously and ensure the welding quality at the welding point of the plates; After spot welding is completed at one place, lift the electric welding electrode rod 8 located above by the hydraulic cylinder 3, and then start the moving motor 702 and drive the adjusting screw rod 703 to move, so that the adjusting screw rod 703 drives the adjusting slider 708 to move, so that the moving support frame 704, the bottom support plate 705, the reinforcement electric telescopic rod 707, and the pressing plate 706 move a distance, and perform spot welding on the moved position. By controlling the moving distance of the adjusting slider 708, equidistant resistance spot welding of the plates is achieved.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. An equidistant resistance spot welding device for metal plate processing, comprising an equipment body (1), a hydraulic cylinder (3) is fixed on the top of the equipment body (1), a second electric telescopic rod (9) is fixed at the front end of the equipment body (1), the piston rod of the hydraulic cylinder (3) penetrates through the top of the equipment body (1) and is fixed with a first electric telescopic rod (4), the piston rod ends of the first electric telescopic rod (4) and the insulating protective sleeve (5) are both installed through the insulating protective sleeve (5), welding electrode rods (8) are inserted at the ends of the two insulating protective sleeves (5) close to each other, the other end of the insulating protective sleeve (5) is fixedly penetrated with a connecting wire (10), one end of the connecting wire (10) is fixed to the welding electrode rod (8), and the other end of the connecting wire (10) extends into the equipment body (1), characterized in that: A positioning and pressing structure (6) is fixed on the front surface of the equipment body (1). The positioning and pressing structure (6) includes a cooling water tank (601), which is fixedly connected to the equipment body (1). Two circulating cooling micro water pumps (602) are fixed on one side of the cooling water tank (601). Two cooling return water pipes (607) are fixedly penetrated through the other end of the cooling water tank (601). A cooling water outlet pipe (603) is fixed at the output end of the circulating cooling micro water pump (602). A positioning ring (605) is fixed between the ends of the cooling water outlet pipe (603) and the cooling return water pipe (607) that are close to each other. A flow velocity sensor (604) is installed at the end of the cooling water outlet pipe (603) connected to the positioning ring (605). Two elastic connecting rods (606) are fixed on the outer surface of the positioning ring (605), and one end of the elastic connecting rod (606) is fixed outside the insulating protective sleeve (5).

2. The equidistant resistance spot welding device for metal plate processing according to claim 1, characterized in that: A cooling annular water channel (608) is arranged inside the positioning ring (605). The ends of the cooling water outlet pipe (603) and the cooling return water pipe (607) connected to the positioning ring (605) penetrate through the shell of the positioning ring (605) and extend to the inner side of the cooling annular water channel (608).

3. The equal-spacing resistance spot welding device for metal plate processing according to claim 2, characterized in that: A plurality of temperature sensors (609) are inlaid on the surface of the positioning ring (605) in contact with the plate material, and the temperature sensors (609) are distributed in a circular array around the axis of the positioning ring (605).

4. The equal-spacing resistance spot welding device for metal plate processing according to claim 1, characterized in that: A moving mechanism (7) is also fixedly installed on the front surface of the equipment body (1). The moving mechanism (7) includes two symmetrically distributed fixed rods (701). The two fixed rods (701) are respectively located on both sides of the equipment body (1) and are fixed to the equipment body (1). A moving motor (702) is fixed at the end of one of the fixed rods (701).

5. The equidistant resistance spot welding device for metal plate processing according to claim 4, wherein: An adjusting lead screw (703) is rotatably installed between the two fixed rods (701). The end of the adjusting lead screw (703) penetrates through the fixed rod (701) and is rotatably connected to the fixed rod (701) through a roller bearing. The output shaft end of the moving motor (702) is fixed to one end of the adjusting lead screw (703).

6. The equidistant resistance spot welding device for metal plate processing according to claim 5, characterized in that: Two adjusting sliders (708) are arranged outside the adjusting lead screw (703). The two adjusting sliders (708) are penetrated by the adjusting lead screw (703) and are in threaded transmission with the adjusting lead screw (703). A moving support frame (704) is fixed outside the adjusting slider (708).

7. An equidistant resistance spot welding device for metal plate processing according to claim 6, characterized in that: The tops of the two moving support frames (704) are fixed with a bottom support plate (705). A pressing plate (706) is arranged above the bottom support plate (705). Both the bottom support plate (705) and the pressing plate (706) are in a U-shaped structure.

8. An equidistant resistance spot welding device for metal plate processing according to claim 7, characterized in that: An L-shaped support frame is fixed outside the moving support frame (704). A reinforcing electric telescopic rod (707) is fixed on the upper surface of the L-shaped support frame, and the piston rod of the reinforcing electric telescopic rod (707) is fixed to the bottom of the pressing plate (706).

9. The equidistant resistance spot welding device for metal plate processing according to claim 8, wherein: A guide hole is provided through the bottom end of the adjusting slider (708), and a guide rod (709) is inserted through the inner sides of the two guide holes.

10. The equidistant resistance spot welding device for metal plate processing according to claim 9, characterized in that: The guide rod (709) is parallel to the adjusting lead screw (703), and both ends of the guide rod (709) penetrate through the two fixing rods (701) and are fixed to the fixing rods (701).

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