CN108608102B

CN108608102B - Projection welding tool

Info

Publication number: CN108608102B
Application number: CN201611145159.8A
Authority: CN
Inventors: 阎海波; 茅忠群; 诸永定; 李立波
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2016-12-13
Filing date: 2016-12-13
Publication date: 2020-07-28
Anticipated expiration: 2036-12-13
Also published as: CN108608102A

Abstract

The invention relates to a projection welding tool, which comprises a host machine, an upper electrode assembly and a lower electrode assembly which are arranged on the host machine, and further comprises a positioning system for fixing a workpiece group to be welded, wherein the workpiece group to be welded comprises a plate-shaped first workpiece and a net-plate-shaped second workpiece, the positioning system comprises a horizontal positioning mechanism for fixing the first workpiece and a vertical positioning mechanism for fixing the second workpiece on the first workpiece, the vertical positioning mechanism comprises a frame body and at least two buffers arranged on the frame body, and each buffer is used for vertically compressing the second workpiece and the first workpiece. Compared with the prior art, the vertical positioning mechanism can accurately position a workpiece group to be welded, provides welding efficiency, and ensures welding quality, and in addition, the vertical positioning mechanism comprises a plurality of buffers, and each buffer can vertically apply pressure on the second workpiece and the first workpiece, so that the deformation of the mesh-plate-shaped second workpiece in the welding process is avoided, the flatness of a welded finished product is ensured, and the welding quality is further ensured.

Description

Projection welding tool

Technical Field

The invention relates to the technical field of welding, in particular to a projection welding tool.

Background

The oven door of the microwave oven is formed by welding the iron door body and the screen plate, the traditional welding device generally adopts a circular electrode for welding, only one or a few points can be welded at one time during welding, and the welding power is low, for example, welding machine structures disclosed in Chinese patent invention of high-efficiency spot welding machine with application number CN201310734351.0 (publication number CN104741753A), Chinese patent invention of single-point welding machine with patent number Z L201110099706.4 (publication number CN102179614B), and the like are disclosed, therefore, the welding device with the rectangular electrode is disclosed in Chinese patent invention of steel grid plate welding machine with patent number Z L200710015496, X (publication number CN101049651A), and Chinese patent invention of intermediate frequency inversion grid plate press welding machine with application number 200910019847.3 (publication number CN 101837507A), and compared with the circular electrode, the welding efficiency is improved by the rectangular electrode, but no welding device is provided with a structure for positioning the welding workpiece, so that the welding workpiece can not be accurately positioned in the welding process, the welding quality is influenced, and the welding device especially has higher requirement for positioning the iron door body.

Disclosure of Invention

The invention aims to solve the technical problem of providing a projection welding tool which can accurately position a workpiece and has high welding quality aiming at the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a projection welding frock, including the host computer and set up last electrode subassembly and the lower electrode subassembly on this host computer, wherein go up the electrode subassembly and include the electrode holder and set up the last electrode on this electrode holder, lower electrode subassembly includes electrode holder and the lower electrode of setting on this electrode holder down, a serial communication port, still include the positioning system who is used for the fixed workpiece group of waiting to weld, wherein should wait to weld the workpiece group and include platelike first work piece and the second work piece of net plate-like, this positioning system is including the horizontal positioning mechanism who is used for fixed first work piece and the vertical positioning mechanism who is used for being fixed in the second work piece on first work piece, this vertical positioning mechanism includes the support body and sets up two at least buffers on this support body, each buffer all is used for vertical compressing tightly second work piece and first work piece.

Preferably, the lower electrode comprises a horizontal workbench for placing a workpiece to be welded and a lower electrode tip vertically arranged on the workbench, the horizontal positioning mechanism comprises a positioning block arranged on the workbench, and during welding, the positioning block is located below the first workpiece and is connected with the bottom of the first workpiece in a matched manner, is opposite to the buffer and can bear the downward pressure of the buffer. The second workpiece can be more stably fixed on the first workpiece, and the second workpiece can be prevented from being deformed by pressure in the positioning process, so that the flatness of a welded finished product is ensured.

Preferably, the positioning blocks at least comprise a first positioning block arranged in front and back of the lower electrode tip, and a second positioning block and a third positioning block respectively arranged at two sides of the lower electrode tip, when welding, the lower electrode tip is arranged below the edge to be welded of the first workpiece, and the first positioning block, the second positioning block and the third positioning block are respectively arranged below the other edges of the first workpiece.

Further, the upper electrode assembly comprises an upper electrode head arranged opposite to the lower electrode head, the frame body comprises a horizontally arranged mounting frame and a first connecting block connected with the upper electrode head, the buffers are arranged on the mounting frame, and the buffers are at least arranged opposite to the end parts of the positioning blocks. During welding, the vertical positioning mechanism can move downwards along with the upper electrode, and meanwhile, the second workpiece is tightly pressed on the first workpiece.

In order to further avoid the deformation of the second workpiece in the force application state of the vertical positioning mechanism, preferably, the edge of the mounting frame opposite to the upper electrode head is bent and comprises a first folded edge and a second folded edge which are intersected, the straight line of the first folded edge is connected with the buffer opposite to one end of the first positioning block and the buffer adjacent to the buffer and opposite to the end part of the second positioning block, and the straight line of the second folded edge is connected with the buffer opposite to the other end of the first positioning block and the buffer adjacent to the buffer and opposite to the end part of the third positioning block. In order to enable the projection welding tool to be applied to workpieces of various specifications, preferably, the first positioning block is detachably connected with the workbench, a sliding block is arranged at the bottom of the first positioning block and can slide back and forth on the workbench relative to the lower electrode, a first sliding groove is formed in one surface of the sliding block, which is opposite to the sliding surface of the workbench, and a first locking hole is formed in the other surface of the sliding block and is used for the first locking piece to penetrate through and lock the sliding block at the corresponding position of the workbench through the first locking piece.

In order to facilitate the adjustment of the position of the upper electrode head for convenient use, preferably, the upper electrode assembly further comprises a second connecting block horizontally arranged, the upper electrode head is detachably connected to the upper electrode base through the second connecting block and can slide back and forth on the upper electrode base relative to the main body, one surface of a sliding surface of the second connecting block relative to the upper electrode base is provided with a second sliding groove, the other surface of the sliding surface is provided with a second locking hole, and the second locking hole is used for the second locking piece to penetrate through and lock the connecting block at the corresponding position of the upper electrode base through the second locking piece.

Further, on the basis of the adjustment of the upper electrode tip, in order to adjust the lower electrode tip conveniently, preferably, the workbench and the lower electrode holder are detachably connected and can slide back and forth on the lower electrode holder relative to the host machine, a third sliding groove is formed in one surface of the sliding fit surface of the workbench relative to the lower electrode holder, a third locking hole is formed in the other surface of the sliding fit surface of the workbench relative to the lower electrode holder, and the third locking hole is used for the third locking piece to penetrate through and lock the workbench at the corresponding position of the lower electrode holder through the third locking piece.

Preferably, each positioning block is provided with a matching part which is in clamping fit with the bottom of the first workpiece to be welded, so that the positioning blocks can be conveniently assembled with the first workpiece on the basis of accurately positioning the first workpiece.

The projection welding tool is suitable for welding various plate bodies and screen plates, preferably, the first workpiece is an iron door plate of a microwave oven door, the second workpiece is the screen plate of the microwave oven door, and the matching part is a groove matched with a convex rib at the bottom of the iron door plate.

Compared with the prior art, the invention has the advantages that: the projection welding tool comprises a positioning system for fixing a workpiece group to be welded, the positioning system comprises a horizontal positioning mechanism and a vertical positioning mechanism, so that the workpiece group to be welded can be accurately positioned, the welding efficiency is improved, and the welding quality is ensured.

Drawings

FIG. 1 is a schematic structural view of a projection welding tool in an embodiment of the present invention;

FIG. 2 is an enlarged view of section I of FIG. 1;

FIG. 3 is another schematic view of the structure of FIG. 1;

FIG. 4 is an enlarged view of section II of FIG. 3;

FIG. 5 is a schematic view of the structure of the lower electrode assembly in an embodiment of the present invention;

FIG. 6 is a partial structural exploded view of a lower electrode assembly in an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an upper electrode assembly in an embodiment of the present invention;

FIG. 8 is another schematic view of the structure of FIG. 7;

FIG. 9 is a schematic structural diagram of a projection welding tool in an embodiment of the present invention in a use state;

fig. 10 is an enlarged view of the portion iii in fig. 9.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 10, a projection welding tool includes a main machine 1, and an upper electrode assembly 2 and a lower electrode assembly 3 disposed at the front side of the main machine 1, wherein the upper electrode assembly 2 includes an upper electrode holder 21 and an upper electrode disposed on the upper electrode holder 21, the lower electrode assembly 3 includes a lower electrode holder 31 and a lower electrode disposed on the lower electrode holder 31, the lower electrode holder 31 is disposed on a base 11 of the main machine 1, the upper electrode includes an upper electrode head 22, the lower electrode includes a lower electrode head 32, and the upper electrode head 22 and the lower electrode head 32 are disposed opposite to each other.

The projection welding tool of the present invention is suitable for welding various plate bodies and screen plates, and the embodiment further details the scheme of the present invention by taking a microwave oven door as an example, and the workpiece groups to be welded in the following description are an iron door body and a screen plate of the microwave oven door, wherein the first workpiece 101 is the iron door body, and the second workpiece 102 is the screen plate.

The projection welding tool further comprises a positioning system for fixing the group of workpieces to be welded, wherein the positioning system comprises a horizontal positioning mechanism 4 for fixing the first workpiece 101 and a vertical positioning mechanism 5 for fixing the second workpiece 102 on the first workpiece 101.

Further, the lower electrode further comprises a horizontal workbench 44 for placing a workpiece to be welded, the lower electrode tip 32 is vertically arranged on one side of the workbench 44, the horizontal positioning mechanism 4 comprises a positioning block arranged on the workbench 44, and during welding, the positioning block is positioned below the first workpiece 101 and is connected with the bottom of the first workpiece 101 in a matching manner. Specifically, the positioning block is square, and includes a first positioning block 41 disposed opposite to the lower electrode tip 32 in front and back, and a second positioning block 42 and a third positioning block 43 respectively disposed at two sides of the lower electrode tip 32, during welding, the lower electrode tip 32 is disposed below the edge to be welded of the first workpiece 101, and the first positioning block 41, the second positioning block 42, and the third positioning block 43 are disposed below the other edges of the first workpiece 101, respectively, so as to stably position the first workpiece 101. In order to make the positioning blocks better fit with the bottom of the first workpiece 101, each positioning block is provided with a fitting portion 40 which is in clamping fit with the bottom of the first workpiece 101 to be welded, in this embodiment, the fitting portion 40 is a groove provided on each positioning block, specifically, an outer wall of a middle upper portion of each positioning block extends horizontally outwards to form a bump 45, the grooves are respectively formed on the bump 45 along the length direction of the positioning block, and corners of groove walls of the grooves are in smooth transition to avoid scratching the surface of the first workpiece 101, and in addition, the grooves are inclined downwards relative to inner wall surfaces of the positioning blocks to guide the convex ribs at the bottom of the first workpiece 101 to slide into the grooves.

The vertical positioning mechanism 5 includes a frame body 51 and a plurality of buffers 52 disposed on the frame body 51, each buffer 52 is used for vertically pressing the second workpiece 102 and the first workpiece 101, and each buffer 52 is disposed opposite to the positioning block, and each positioning block can bear the downward pressure of the buffer 52. The frame body 51 includes a horizontally disposed mounting frame 511 and a first connecting block 512 connected to the upper electrode head 22, each buffer 52 is disposed on the mounting frame 511, and each buffer 52 is disposed opposite to an end of each positioning block, that is, each positioning block corresponds to two buffers 52 in this embodiment. Furthermore, the edge of the mounting frame 511 opposite to the upper electrode head 22 is bent and includes a first folded edge 513 and a second folded edge 514 which are intersected, and a straight line of the first folded edge 513 connects the bumper 52 opposite to one end of the first positioning block 41 and the bumper 52 adjacent to the bumper 52 and opposite to the end of the second positioning block 42, and a straight line of the second folded edge 514 connects the bumper 52 opposite to the other end of the first positioning block 41 and the bumper 52 adjacent to the bumper 52 and opposite to the end of the third positioning block 43, so that the deformation of the second workpiece 102 in the state of force application of the vertical positioning mechanism 5 can be further avoided.

In order to enable the projection welding tool to be used for workpieces with various specifications, preferably, the first positioning block 41 is detachably connected with the workbench 44, a sliding block 46 is arranged at the bottom of the first positioning block 41, the sliding block 46 can slide back and forth on the workbench 44 relative to the lower electrode, one surface of the sliding block 46 opposite to the workbench 44 is provided with a first sliding groove 47, the other surface is provided with a first locking hole 49, and the first locking hole 49 is used for a first locking piece to penetrate through and locks the sliding block 46 at a corresponding position of the workbench 44 through the first locking piece.

In order to adjust the position of the upper electrode head 22 for convenient use, preferably, the upper electrode assembly 2 further includes a second connecting block 23 horizontally disposed, the upper electrode head 22 is detachably connected to the upper electrode base 21 through the second connecting block 23 and can slide back and forth on the upper electrode base 21 relative to the host, one surface of the sliding surface of the second connecting block 23 relative to the upper electrode base 21 is provided with a second sliding groove 211, and the other surface is provided with a second locking hole 231, and the second locking hole 231 is used for the second locking member to penetrate through and lock the connecting block at the corresponding position of the upper electrode base 21 through the second locking member. Further, based on the adjustment of the upper electrode tip 22, in order to facilitate the adjustment of the lower electrode tip 32, preferably, the workbench 44 and the lower electrode holder 31 are detachably connected and can slide back and forth on the lower electrode holder 31 relative to the main machine 1, one surface of the sliding surface of the workbench 44 and the lower electrode holder 31 is provided with a third sliding groove 311, and the other surface is provided with a third locking hole 48, wherein the third locking hole 48 is used for the third locking member to penetrate through and lock the workbench 44 at the corresponding position of the lower electrode holder 31 through the third locking member. In this embodiment, the first locking member, the second locking member and the third locking member are all fastening screws (not shown).

The welding process of the iron door body and the screen plate by applying the projection welding tool provided by the invention is as follows: the iron door body is placed on the workbench 44, the convex ribs at the bottom of the iron door body are respectively clamped into the grooves of the corresponding positioning blocks, meanwhile, the to-be-welded edge of the iron door body is positioned on the lower electrode tip 32, then, the concave surface of the screen plate is placed on the bulge on the front surface of the iron door body, the screen plate and the iron door body are buckled together in a matching manner, then, the upper electrode is pressed downwards, the upper electrode head 22 is pressed on the screen plate, at the moment, the buffer 52 moves downwards along with the upper electrode head 22 to press the screen plate and the iron door body tightly, and then, welding operation is carried out. The four sides of the iron door body and the screen plate are welded in sequence according to the steps, namely, the welding operation of the furnace door is completed, and the projection welding process parameters in the embodiment are as shown in table 1.

TABLE 1 projection welding Process parameters in this example

Claims

1. A projection welding tool comprises a main machine (1), and an upper electrode assembly (2) and a lower electrode assembly (3) which are arranged on the main machine (1), wherein the upper electrode assembly (2) comprises an upper electrode seat (21) and an upper electrode arranged on the upper electrode seat (21), the lower electrode assembly (3) comprises a lower electrode seat (31) and a lower electrode arranged on the lower electrode seat (31), the projection welding tool is characterized by further comprising a positioning system for fixing a group of workpieces to be welded, wherein the group of workpieces to be welded comprises a plate-shaped first workpiece (101) and a net-plate-shaped second workpiece (102), the positioning system comprises a horizontal positioning mechanism (4) for fixing the first workpiece (101) and a vertical positioning mechanism (5) for fixing the second workpiece (102) on the first workpiece (101), the vertical positioning mechanism (5) comprises a frame body (51) and at least two buffers (52) arranged on the frame body (51), each buffer (52) is used for vertically pressing a second workpiece (102) and a first workpiece (101), each lower electrode comprises a horizontal workbench (44) for placing the workpieces to be welded and a lower electrode tip (32) vertically arranged on the workbench (44), each horizontal positioning mechanism (4) comprises a positioning block arranged on the workbench (44), each positioning block is positioned below the first workpiece (101) and is matched and connected with the bottom of the first workpiece (101) during welding, each positioning block is opposite to the buffer (52) and can bear the downward pressure of the buffer (52), each positioning block at least comprises a first positioning block (41) opposite to the lower electrode tip (32), and a second positioning block (42) and a third positioning block (43) respectively positioned on two sides of the lower electrode tip (32), and during welding, the lower electrode tip (32) is positioned below the edge to be welded of the first workpiece (101), the first positioning block (41), the second positioning block (42) and the third positioning block (43) are respectively located below other edges of the first workpiece (101), the upper electrode assembly (2) comprises an upper electrode head (22) arranged opposite to the lower electrode head (32), the frame body (51) comprises a horizontally arranged installation frame (511) and a first connecting block (512) connected with the upper electrode head (22), the buffers (52) are arranged on the installation frame (511), and the buffers (52) are at least arranged above the end portions of the positioning blocks.

2. The projection welding tool according to claim 1, wherein the edge of the mounting frame (511) opposite to the upper electrode head (22) is bent and comprises a first folded edge (513) and a second folded edge (514) which are intersected, the first folded edge (513) is located on a straight line which is connected with the buffer (52) opposite to one end of the first positioning block (41) and the buffer (52) which is adjacent to the buffer (52) and opposite to the end of the second positioning block (42), and the second folded edge (514) is located on a straight line which is connected with the buffer (52) opposite to the other end of the first positioning block (41) and the buffer (52) which is adjacent to the buffer (52) and opposite to the end of the third positioning block (43).

3. The projection welding tool according to claim 1, wherein the first positioning block (41) is detachably connected with the workbench (44), a sliding block (46) is arranged at the bottom of the first positioning block (41), the sliding block (46) can slide back and forth on the workbench (44) relative to the lower electrode tip (32), a first sliding groove (47) is formed in one surface of the sliding fit surface of the sliding block (46) relative to the workbench (44), a first locking hole (49) is formed in the other surface of the sliding fit surface of the sliding block (46) relative to the workbench (44), and the first locking hole (49) is used for the first locking piece to penetrate through and lock the sliding block (46) at the corresponding position of the workbench (44) through the first locking piece.

4. The projection welding tool according to claim 1, wherein the upper electrode assembly (2) further comprises a second connecting block (23) horizontally arranged, the upper electrode head (22) is detachably connected to the upper electrode holder (21) through the second connecting block (23) and can slide back and forth on the upper electrode holder (21) relative to the main machine (1), one surface of the opposite sliding surfaces of the second connecting block (23) and the upper electrode holder (21) is provided with a second sliding groove (211), the other surface is provided with a second locking hole (231), and the second locking hole (231) is used for the second locking member to penetrate through and lock the second connecting block (23) at the corresponding position of the upper electrode holder (21).

5. The projection welding tool according to claim 4, wherein the workbench (44) is detachably connected with the lower electrode holder (31) and can slide back and forth on the lower electrode holder (31) relative to the main machine (1), one surface of the sliding surface of the workbench (44) relative to the lower electrode holder (31) is provided with a third sliding groove (311), the other surface is provided with a third locking hole (48), and the third locking hole (48) is used for the third locking member to penetrate through and lock the workbench (44) at the corresponding position of the lower electrode holder (31) through the third locking member.

6. The projection welding tool according to any one of claims 2 to 5, wherein each positioning block is provided with an engaging portion (40) which is in clamping fit with the bottom of the first workpiece (101) to be welded.

7. The projection welding tool according to claim 6, characterized in that the first workpiece (101) is an iron door plate of a microwave oven door, the second workpiece (102) is a screen plate of the microwave oven door, and the matching part (40) is a groove matched with a convex rib at the bottom of the iron door plate.