A welding machine for assembling hardware products

Abstract

This application discloses a welding machine tool for assembling hardware products. Belonging to the technical field of welding machine tools, it includes a worktable on which a welding component is fixedly mounted. A conveyor roller is arranged on the worktable along the feeding direction, and the welding component is positioned directly above one section of the conveyor roller. A clamping component is fixedly mounted on the side wall of the worktable between the welding component and the conveyor roller. The clamping component is used for circumferential positioning of the workpiece at the welding station. This structure utilizes the synchronous extension of hydraulic rods on both sides of the clamping component to achieve automatic centering and clamping, ensuring that irregularly shaped hardware assemblies are locked in position at the moment of welding, significantly improving weld alignment accuracy. For hardware products of different specifications, the welding torch can be adjusted in height via an electric telescopic rod, in horizontal position via a screw, and in welding position via an electric turntable. The three-axis linkage adjustment mechanism makes the machine setup time extremely short when changing product models, without the need to disassemble the mechanical clamps.

Description

Technical Field

[0001] This invention relates to the field of welding machine tool technology, and more specifically to a welding machine tool for assembling hardware products. Background Technology

[0002] Welding is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. During the assembly of hardware products, multiple metal stampings, castings or standard parts usually need to be welded and fixed, such as hinge welding, bracket connection, shell encapsulation, etc.

[0003] In practical production applications, traditional welding machine tools used for assembling hardware products still generally suffer from the following technical problems and shortcomings: 1. Insufficient clamping and positioning accuracy leads to decreased yield due to welding micro-movements. Most existing online welding machine tools rely solely on the friction of the conveyor rollers to limit the workpiece, or apply clamping force only in the vertical direction. For irregularly shaped hardware assemblies with a shifted center of gravity, the workpiece is prone to circumferential micro-movements when the conveyor rollers stop rotating due to inertia. 2. Changeover and debugging rely on mechanical disassembly and assembly, resulting in low production efficiency. Hardware products are mostly produced in small batches with a wide variety of varieties. In existing equipment, the adjustment mechanism of the welding torch is relatively simple, typically only having manual lifting or simple horizontal sliding functions. When switching between product models with different heights and weld angles, operators must stop the machine and manually disassemble and reinstall the welding torch fixture using wrenches and other tools to adjust its posture. This process is time-consuming and labor-intensive, significantly increasing the non-processing waiting time on the production line. Therefore, there is an urgent need to develop a welding machine tool for assembling hardware products to solve the problems of insufficient clamping accuracy, cumbersome disassembly and assembly, and low production efficiency in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a welding machine tool for assembling hardware products, which improves the changeover efficiency through three-axis linkage and electric turntable; ensures the welding stability of the assembled parts through hydraulic clamping with centering on both sides; and improves the service life of the transmission system through the combination of insulating gaskets and high-temperature grease.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A welding machine tool for assembling hardware products includes a worktable on which a welding component is fixedly mounted. The worktable is characterized by having a conveyor roller arranged along the feeding direction, with the welding component positioned directly above one section of the conveyor roller. A clamping component is fixedly mounted on the side wall of a support between the welding component and the conveyor roller, the clamping component being used for circumferential positioning of the workpiece at the welding station. A cleaning steel brush is fixedly installed inside the workbench, directly below the conveyor roller at the welding station. The bristles of the cleaning steel brush elastically abut against the surface of the conveyor roller to remove welding spatter adhering to the roller surface in real time.

[0006] As a further aspect of the present invention: an n-shaped bracket spanning the conveyor roller is fixedly installed on the workbench, the welding assembly is fixedly installed on the inner top wall of the bracket, the clamping assembly is fixedly installed on the inner two side walls of the bracket, and isolation curtains for blocking welding slag splash are slidably installed at the front and rear openings of the bracket.

[0007] As a further aspect of the present invention: the welding assembly includes a horizontal moving mechanism, the horizontal moving mechanism including a drive motor, a screw driven by the drive motor, and a connecting block threadedly engaged with the screw.

[0008] As a further aspect of the present invention: the lower end of the connecting block is fixedly connected to an electric telescopic rod extending vertically downward, and the piston end of the electric telescopic rod is fixedly connected to a welding torch.

[0009] As a further aspect of the present invention: an electric turntable is also connected between the piston end of the electric telescopic rod and the welding torch, and the welding torch adjusts the welding angle via the electric turntable. As a further aspect of the present invention: a monitoring camera is fixedly installed at the inner top of the bracket and on one side of the welding station. The lens of the monitoring camera is directly facing the working tip of the welding gun and is used to collect images of the weld pool to assist in calibrating the position of the welding gun.

[0010] As a further aspect of the present invention: the clamping assembly includes a pair of hydraulic telescopic rods arranged opposite each other on both sides of the conveyor roller, and the piston rod end of each hydraulic telescopic rod is fixed with a clamping block made of high temperature resistant material.

[0011] As a further aspect of the present invention: an insulating gasket is added to the bearing seat of the conveyor roller located below the welding assembly to block the welding current from being conducted to the conveyor roller bearing through the workpiece, and the bearing is lubricated with high-temperature resistant grease.

[0012] As a further aspect of the present invention: the cleaning steel brush is a row of steel wire brushes parallel to the axis of the conveyor roller, and a detachable welding slag collection box is also provided inside the workbench directly below the cleaning steel brush.

[0013] Compared with existing technologies, the advantages of this invention are as follows: By utilizing the synchronous extension of hydraulic rods on both sides of the clamping assembly, automatic centering and clamping are achieved, ensuring that irregularly shaped hardware assemblies are locked in position at the moment of welding. This avoids circumferential micro-movements caused by the rotational inertia of the conveyor rollers or contact with the welding torch, significantly improving weld alignment accuracy. For hardware products of different specifications, the welding torch can be adjusted in height via an electric telescopic rod, in horizontal position via a screw, and in welding position via an electric turntable. This three-axis linkage adjustment mechanism makes machine setup time extremely short when changing product models, eliminating the need to disassemble mechanical fixtures. The inclusion of cleaning steel brushes, slag collection boxes, and insulating gaskets on the conveyor roller bearing seats specifically addresses the three most common pain points of welding machine tools: bearing damage, jamming, and high-temperature failure, significantly extending the trouble-free operating time of the conveying system.

[0014] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the support on the workbench in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cleaning steel brush installation structure in an embodiment of the present invention.

[0016] The figures are labeled as follows: 1. Workbench; 101. Support; 2. Welding assembly; 201. Electric telescopic rod; 202. Welding torch; 203. Connecting block; 204. Screw; 205. Drive motor; 3. Conveyor roller; 4. Clamping assembly; 401. Hydraulic telescopic rod; 5. Cleaning steel brush; 6. Monitoring camera; 7. Isolation curtain; 8. Electric turntable; 9. Welding slag collection box. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In this embodiment of the invention, a welding machine tool for assembling hardware products is described below. Figure 1-3As shown, the workbench 1 is a rectangular metal frame structure, with its length defined as the feeding direction. Several conveyor rollers 3 are arranged at equal or unequal intervals along the feeding direction on the upper surface of the workbench 1. Each conveyor roller 3 is connected to an external drive motor via a chain or belt to achieve smooth conveying of the workpiece. At a specific welding station in the middle section of the workbench 1, an n-shaped bracket 101 is fixedly installed across the conveyor rollers 3. The bracket 101 consists of two side columns and a top beam, forming a doorway-like passage for the workpiece to pass through. The inner top wall of the bracket 101 serves as the mounting base for the welding assembly 2, while its inner two side walls serve as the mounting base for the clamping assembly 4. To prevent welding sparks and fumes from spreading into the workshop, liftable isolation curtains 7 are slidably installed on the front opening (feed port) and rear opening (discharge port) of the bracket 101 via slide rails. The isolation curtain 7 is preferably made of high-temperature resistant silicone coated fabric or metal woven soft curtain.

[0019] In this embodiment, a horizontal moving mechanism is fixedly installed on the lower surface of the top crossbeam of the bracket 101. This horizontal moving mechanism includes a long, narrow mounting base. A drive motor 205 is fixed to one end of the mounting base. The output shaft of the drive motor 205 is connected via a coupling to a screw 204 extending horizontally along the radial direction of the conveyor roller 3. A connecting block 203 is threaded onto the screw 204. To prevent the connecting block 203 from rotating with the screw, a guide rail is provided on the mounting base parallel to the screw 204. The upper part of the connecting block 203 slides against this guide rail. When the drive motor 205 rotates forward and backward, the connecting block 203 reciprocates linearly along the screw 204, thereby adjusting the welding position of the welding torch in the horizontal direction. An electric telescopic rod 201 is vertically fixed to the lower end face of block 203 via bolt flange. The electric telescopic rod 201 is preferably a servo electric cylinder, which contains a lead screw and nut pair and a servo motor. It can precisely control the extension length of the piston rod, thereby achieving precise positioning of the welding torch 202 in vertical height. At the end of the piston rod of the electric telescopic rod 201, an electric turntable 8 is fixedly connected. The electric turntable 8 is a precision rotary platform driven by a micro stepper motor. The torch body of the welding torch 202 is fixedly mounted on the rotating end face of the electric turntable 8. By controlling the rotation of the electric turntable 8, the position of the nozzle of the welding torch 202 is adjusted.

[0020] In this embodiment, the clamping assembly 4 specifically includes two sets of opposing hydraulic telescopic rods 401. An installation hole is provided on each of the two inner side walls of the bracket 101 (i.e., on each side of the conveyor roller 3, and the cylinder tail of the hydraulic telescopic rod 401 is fixedly installed in the installation hole via a pin), and its piston rod points horizontally towards the center area of ​​the conveyor roller 3. A replaceable clamping block is threaded to the end of the piston rod of the hydraulic telescopic rod 401. Given the high temperature at the welding station, the clamping block is made of high-temperature resistant polytetrafluoroethylene or brass, and its surface is machined with anti-slip knurling.

[0021] In this embodiment, the bearing housing structure at both ends of at least two conveyor rollers 3 located directly below the welding station differs from the conventional structure. Specifically, an insulating gasket is installed between the outer ring of the bearing and the inner hole of the bearing housing. The insulating gasket is preferably an epoxy glass cloth laminate or a ceramic fiber washer. Simultaneously, an insulating sleeve is also installed between the fastening bolts connecting the bearing housing and the metal frame of the worktable 1. This structure cuts off the stray current loop of "workpiece → conveyor roller surface → bearing balls → worktable ground," effectively preventing electrolytic pitting on the bearing raceway. The bearings of the conveyor rollers 3 with the added insulating gaskets are filled with perfluoropolyether high-temperature resistant grease instead of ordinary lithium-based grease. This grease does not carbonize or leak under continuous baking at temperatures above 200°C, ensuring the long-term flexible operation of the conveyor rollers 3.

[0022] In this embodiment, when the cleaning steel brush 5 is installed, the tips of the bristles are slightly bent and deformed, so that they elastically abut against the surface of the lower busbar of the conveyor roller 3. When the conveyor roller 3 rotates, the bristles scrape off the welding slag particles adhering to the roller surface. Directly below the cleaning steel brush 5, a slot is provided on the bottom plate of the workbench 1. A detachable welding slag collection box 9 is placed in the slot. The scraped welding slag falls directly into the collection box 9 under the action of gravity. The operator can periodically take out the collection box 9 from the side of the workbench for cleaning.

[0023] In this embodiment, a monitoring camera 6 is fixedly installed at the top of the bracket 101 near the front. The monitoring camera 6 is a high-temperature resistant industrial endoscopic miniature camera, and its exterior is covered with a high-temperature resistant glass protective cover to prevent welding fumes from contaminating the lens. The signal line and power line of the camera 6 are led out through the wiring hole at the top of the bracket 101 and connected to an external industrial control computer or PLC touch screen display. The lens axis of the monitoring camera 6 is tilted downwards, facing the tip of the conductive nozzle of the welding torch 202, so that the operator can observe the flow of the welding pool in real time.

[0024] Understandably, the hardware assembly is placed on the conveyor roller 3 and enters the n-shaped bracket 101 as the roller rotates. After the workpiece reaches the welding assembly and is lowered, the conveyor roller 3 is turned off to stop rotating. The hydraulic telescopic rod 401 of the clamping assembly 4 is activated to automatically center and clamp the workpiece, locking its circumferential position to ensure that the weld gap remains unchanged. The horizontal position of the welding gun is adjusted by the drive motor 205, the height of the welding gun is adjusted by the electric telescopic rod 201, and the position of the welding gun is adjusted by the electric turntable 8. The welding gun 202 initiates the arc for welding. During this process, the monitoring camera 6 transmits the molten pool image back in real time. During the welding and conveying process, the surface of the conveyor roller 3 continuously rubs against the cleaning steel brush 5 below as it rotates, removing the welding slag in real time. The welding slag falls into the collection box 9. After welding is completed, the hydraulic telescopic rod 401 retracts, the isolation curtain 7 rises, and the conveyor roller 3 restarts to send the workpiece out.

[0025] This invention provides a welding machine tool for assembling hardware products. It improves the changeover efficiency through three-axis linkage and an electric turntable; ensures the welding stability of the assembled parts through hydraulic clamping with centering on both sides; and improves the lifespan of the transmission system through the combination of insulating gaskets and high-temperature grease.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A welding machine for assembling hardware products, comprising a worktable (1), a welding assembly (2) is fixedly installed on the worktable (1), characterized in that, The workbench (1) is provided with a conveyor roller (3) arranged along the feeding direction. The welding assembly (2) is mounted directly above one of the conveyor rollers (3). A clamping assembly (4) is fixedly installed on the side wall of the bracket (101) between the welding assembly (2) and the conveyor roller (3). The clamping assembly (4) is used to circumferentially position the workpiece at the welding station. A cleaning steel brush (5) is fixedly installed inside the workbench (1) and directly below the conveyor roller (3) at the welding station. The bristles of the cleaning steel brush (5) elastically abut against the roller surface of the conveyor roller (3) to remove welding spatter adhering to the roller surface in real time.

2. The machine according to claim 1, characterized in that, The workbench (1) is fixedly installed with an n-shaped bracket (101) spanning the conveyor roller (3). The welding assembly (2) is fixedly installed on the inner top wall of the bracket (101). The clamping assembly (4) is fixedly installed on the inner two side walls of the bracket (101). The front and rear openings of the bracket (101) are slidably installed with isolation curtains (7) to block welding slag splashes.

3. The machine according to claim 1, wherein The welding assembly (2) includes a horizontal moving mechanism, which includes a drive motor (205), a screw (204) driven by the drive motor (205), and a connecting block (203) threadedly engaged with the screw (204).

4. The machine according to claim 3, characterized in that, The lower end of the connecting block (203) is fixedly connected to an electric telescopic rod (201) extending vertically downward, and the piston end of the electric telescopic rod (201) is fixedly connected to a welding torch (202).

5. A machine for welding hardware assemblies as claimed in claim 4 wherein, An electric turntable (8) is also connected between the piston end of the electric telescopic rod (201) and the welding torch (202), and the welding torch (202) can adjust the deflection angle of the welding torch (202) through the electric turntable (8).

6. The machine according to claim 2, wherein A monitoring camera (6) is fixedly installed at the top of the inside of the bracket (101) and on one side of the welding station. The lens of the monitoring camera (6) is facing the working tip of the welding gun (202) and is used to collect images of the weld pool to assist in calibrating the position of the welding gun.

7. The machine tool according to claim 1, wherein The clamping assembly (4) includes a pair of hydraulic telescopic rods (401) arranged opposite to each other on both sides of the conveyor roller (3), and the piston rod end of each hydraulic telescopic rod (401) is fixed with a clamping block made of high temperature resistant material.

8. The machine according to claim 1, wherein An insulating gasket is added to the bearing seat of the conveyor roller (3) located below the welding assembly (2) to block the welding current from being conducted to the conveyor roller bearing through the workpiece, and the bearing is lubricated with high-temperature grease.

9. The machine according to claim 1, wherein The cleaning steel brush (5) is a row of steel wire brushes parallel to the axis of the conveyor roller (3). Inside the workbench (1), directly below the cleaning steel brush (5), there is also a detachable welding slag collection box (9).

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