CN107253013A - A kind of Purely mechanical weld jig - Google Patents

Abstract

The invention discloses a purely mechanical welding fixture, which includes a frame, a welding platform is installed on the frame, universal wheels are installed on the bottom of the frame, and an initial positioning mechanism and a linkage mechanism installed on the welding platform are also included. institutions and power source institutions. The present invention can accurately and quickly locate the workpiece through the provided initial positioning mechanism and linkage mechanism, and can clamp multiple workpieces at one time, avoiding the problem of inaccurate positioning existing in multiple clamping of multiple workpieces, and the clamping structure is simple , Easy to operate, safe and reliable, effectively improving the welding efficiency. In addition, the power source mechanism provided by the present invention is to input power through the operating handle, so that the disc-shaped cam plate is powered after the cam is rotated, so that the inner and outer pressing blocks on the pressing plate clamp the workpiece in the transverse direction, and the disc-shaped cam plate The clamping plate and the pressing plate are all center-symmetrically designed, which solves the problem of uneven distribution of clamping force and effectively improves the welding quality.

Description

A purely mechanical welding fixture

technical field

The invention relates to a welding fixture, in particular to a purely mechanical welding fixture capable of clamping multiple workpieces.

Background technique

Home guardrails, corridor escalators, doors and windows, stainless steel anti-theft nets, etc. are all important safety protection devices in our lives. Home guardrails can protect our life and property safety, especially for families with active children. We cannot keep up with them all the time. Behind the children, at this time, the home guardrail plays a very important role in safety protection. These guardrails, escalators, aluminum alloy doors and windows, stainless steel anti-theft nets, etc. are all welded in sequence according to the size and structural requirements of stainless steel. Because these welding products are relatively common and simple life protection devices, it is difficult to carry out large-scale standardized manufacturing. Therefore, the processing of these products is generally made by artificial pure manual welding. The quality of these protective devices obtained by welding is not only the craftsmanship of the welding master, but also the welding auxiliary tools will also affect the quality and efficiency of welding. The most important welding aids are welding fixtures.

In the prior art, there are various types of fixture structures used in other fields, but when making the above-mentioned life protection devices, most of them fix the workpieces to be welded manually or use some simple fixtures for positioning. The welding efficiency is low, the operation is cumbersome, the clamping and positioning of the workpiece is uneven, and the assembly accuracy is poor. In addition, in the prior art, it is impossible to clamp multiple workpieces at one time, which is not conducive to improving the welding speed.

Contents of the invention

In view of the above-mentioned deficiencies, the technical problem to be solved by the present invention is to provide a purely mechanical welding fixture that is safe, reliable, accurately positioned, and quickly clamped. It can clamp and position multiple workpieces to be welded at the same time, which is conducive to improving welding efficiency. .

To achieve the above object, the present invention is achieved through the following technical solutions:

A purely mechanical welding fixture includes a frame on which a welding platform is installed, universal wheels are installed on the bottom of the frame, and an initial positioning mechanism, a linkage mechanism and a power source installed on the welding platform mechanism,

The initial positioning mechanism includes a plurality of positioning blocks distributed in a rectangular structure, and each positioning block is installed on the welding platform through a tightening piece;

The power source mechanism includes two disc-shaped cam plates symmetrically installed at the center of the rectangular structure formed by the positioning blocks, and one side of each disc-shaped cam plate is correspondingly installed with an eccentric for driving the disc-shaped cam plate to slide left and right. The wheel device is connected with a return spring device on the disc cam plate on the other side opposite to the eccentric wheel device;

The linkage mechanism includes two symmetrically installed pressing plates, on each pressing plate an inner pressing block and an outer pressing block are sequentially installed at intervals, one end of the pressing plate is fixed on the disc-shaped cam plate by a roller, and the pressing plate The bottom of the other end is connected with a slider, and the bottom of the slider is correspondingly provided with a guide rail for the slider to slide, and the guide rail is installed on the welding platform.

In the above scheme, the eccentric wheel device includes a cam rotating column, a cam, a handle and a tightening screw, the lower end of the cam rotating column is fixed on the welding platform, and its upper end passes through the top surface of the cam and is threadedly connected with the tightening screw. The side wall of the cam presses the side wall of the disc-shaped cam plate and the cam can rotate along the cam rotating column, and the handle is hinged on the cam.

In the above solution, in order to reduce the friction between the tightening screw and the cam and enhance the rigidity between the cam and the tightening screw, a compression washer can be installed between the tightening screw and the cam.

In the above solution, in order to be suitable for different lengths of workpieces to be processed, through holes are evenly spaced on the pressing plate, and the inner pressing block and the outer pressing block are correspondingly fixed on any through hole through a mounting piece.

In the above solution, the return spring device includes an L-shaped base and a plurality of springs arranged parallel to each other, and a spring guide post with telescopic elasticity runs through each spring, and one end of the spring guide post is connected to the disc cam. The side wall of the plate, the other end thereof, is fixed on an L-shaped base mounted on a welding platform.

The present invention can clamp more than two workpieces through the provided initial positioning mechanism, linkage mechanism and power source mechanism, that is, when in use, after the initial positioning of the workpiece by the initial positioning mechanism, and then for the workpiece to be processed length to adjust the installation position of the inner and outer pressing blocks, and then operate the two handles to drive the cam to rotate along the cam rotating column, the side wall of the cam and the disc cam plate for friction transmission, so that the disc cam plate slides, and the pressing plate follows The sliding block moves on the guide rail, so that the inner and outer pressing blocks laterally clamp the workpiece to be processed, and finally tighten the tightening screw, and the workpiece can be welded. After completion, the tightening screw is unscrewed, and the spring reset mechanism resets. Just remove the weldment.

Compared with prior art, the beneficial effect of the present invention is:

1) The initial positioning mechanism and linkage mechanism used in the present invention can accurately and quickly locate workpieces, and can clamp multiple workpieces at one time, avoiding the problem of inaccurate positioning existing in multiple clamping of multiple workpieces, and the clamping structure It is simple, convenient to operate, safe and reliable, and effectively improves the welding efficiency.

2) The power source mechanism used in the present invention is to input power through the operating handle to give power to the disc cam plate after the cam is rotated, so that the inner and outer pressing blocks on the pressing plate clamp the workpiece in the lateral direction, and the disc cam Both the plate and the pressure plate are center-symmetrical, which solves the uneven distribution of the clamping force; and the power source mechanism can avoid the deformation of the workpiece due to excessive clamping force through artificial input of power, which effectively improves the welding process. quality.

Description of drawings

FIG. 1 is a schematic structural view of the purely mechanical welding fixture.

FIG. 2 is a schematic top view of the purely mechanical welding fixture when no workpiece is placed.

FIG. 3 is a structural schematic diagram of the purely mechanical welding fixture when clamping a workpiece.

Fig. 4 is a side structural view of the linkage mechanism.

Fig. 5 is a structural schematic diagram of the eccentric wheel device.

The labels in the figure are: 1. handle; 2. cam; 3. tightening screw; 4. compression washer; 5. cam rotating column; 6. disc cam plate; 7. roller; 8. pressure plate; Tight block; 10, outer pressing block; 11, slider; 12, guide rail; 13, spring; 14, spring guide post; 15, L-shaped base; 16, positioning block; 17, frame; 18, universal Wheel, 19, welding platform, a, workpiece 1, b, workpiece 2, c, workpiece 3.

detailed description

As shown in FIGS. 1 and 2 , a purely mechanical welding fixture includes a frame 17 on which a welding platform 19 is installed, and universal wheels 18 are installed on the bottom of the frame 17 . In this embodiment, in order to make the welding platform 19 adaptable to welding operators of different heights, the shown frame 17 can be telescopically adjusted in height. The specific structure is an existing structure similar to a retractable umbrella handle. The welding fixture also includes an initial positioning mechanism, a power source mechanism and a linkage mechanism installed on the welding platform 19 .

The preliminary positioning mechanism includes a plurality of positioning blocks 16 distributed in a rectangular structure. In this embodiment, the number of the positioning blocks 16 is 4, of course, it can also be 6, 8, etc. Each positioning block 16 is installed on the welding platform 19 through a tightening member, and the tightening member may specifically be a screw. The positioning block 16 is provided with a U-shaped groove for clamping the workpiece. In order to reduce the friction of the workpiece in the U-shaped groove, a layer of soft rubber layer can be arranged in the U-shaped groove.

The power source mechanism includes two disc-shaped cam plates 6 that are symmetrically installed at the center of the rectangular structure formed by the positioning block 16, and one side of each disc-shaped cam plate 6 is correspondingly installed for driving the disc-shaped cam plate 6. The eccentric wheel device that slides left and right is connected with a back-moving spring device on the other side disk-shaped cam plate 6 opposite to the eccentric wheel device. In this embodiment, the return spring device includes an L-shaped base 15 and a plurality of springs 13 arranged parallel to each other. Each spring 13 runs through a spring guide post 14 with telescopic elasticity. One end of the spring guide post 14 is connected to the side wall of the disk-shaped cam plate 6 , and the other end is fixed to the L-shaped base 15 . The L-shaped base 15 is mounted on a welding platform 19 .

As shown in FIG. 4 , the linkage mechanism includes two symmetrically installed pressing plates 8 , and inner pressing blocks 9 and outer pressing blocks 10 are sequentially installed on each pressing plate 8 at intervals. One end of the pressing plate 8 is fixed on the disc cam plate 6 by a roller 7 , and a slider 11 is connected to the bottom of the other end of the pressing plate 8 . The bottom of the slider 11 is correspondingly provided with a guide rail 12 for the slider 11 to slide, and the guide rail 12 is installed on a welding platform 19 . In this embodiment, the distance between the inner pressing block 9 and the outer pressing block 10 is adjusted to adapt to workpieces of different lengths. Through holes are evenly spaced on the said pressure plate 8, and said inner pressing block 9 and outer pressing block 10 are correspondingly fixed on any one of the through holes through mounting parts. That is, the inner and outer pressing blocks 10 can be selected to be installed on which through hole according to the length of the workpiece to be processed, and the inner and outer pressing blocks 10 are further fixed by the mounting parts. The mounting parts may specifically be bolts and nuts.

As shown in FIG. 5 , the eccentric wheel device includes a cam rotating column 5 , a cam 2 , a handle 1 and a tightening screw 3 . The lower end of the cam rotating column 5 is fixed on the welding platform 19, and its upper end passes through the top surface of the cam 2 and is threadedly connected with the tightening screw 3. A side wall of the cam 2 presses the side wall of the disc-shaped cam plate 6 and the cam 2 can rotate along the cam rotating post 5 , and the handle 1 is hinged on the cam 2 . In this embodiment, a compression washer 4 is installed between the tightening screw 3 and the cam 2 .

When the present invention is working, the embodiment uses clamping a pair of workpieces 1a, a pair of workpieces 2b and a pair of workpieces 3c as clamping objects, as shown in Figure 3:

1) The initial positioning process of the workpiece: first place a pair of workpieces 3c at the center, that is, the space surrounded by the two inner compression blocks 9, and then place a pair of workpieces 1a on the positioning blocks 16 in the longitudinal direction , and align the workpieces on both sides parallel to each other, and finally place a pair of workpieces 2b on the outer compression blocks 10 at the left and right ends respectively, and maintain parallel alignment, and at the same time adjust the installation position of the outer compression blocks 10 on the pressure plate 8 to Make the distance between the port section of the workpiece 1a and the workpiece 2b be zero, and vertically stick to each other at 90°, at this time, the initial positioning of the workpiece is completed;

2) The clamping process of the workpiece: After the initial positioning is completed, the two handles 1 are operated at the same time. The handle 1 drives the cam 2 to rotate along the cam rotating column 5, so that the cam 2 squeezes the disc-shaped cam plate 6 and forms a wheel. The transmission of the force makes the two disc cam plates 6 move inward, and the pressing plate 8 connected with the disc cam plates 6 drives the slider 11 to move on the guide rail 12, so that the inner and outer pressing blocks 10 are laterally clamped to wait The processed workpiece 1a, workpiece 2b and workpiece 3c are finally tightened with the tightening screw 3, and the workpiece can be welded. After completion, unscrew the fastening screw 3, the spring return mechanism resets, and the weldment can be taken out.

The above is only to illustrate the implementation of the present invention, and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be Included within the protection scope of the present invention.

Claims (5)

1. A purely mechanical welding fixture comprises a frame, a welding platform (19) is installed on the frame, and universal wheels (18) are installed at the bottom of the frame, it is characterized in that: it also includes a Initial positioning mechanism, power source mechanism and linkage mechanism on the platform (19), The initial positioning mechanism includes a plurality of positioning blocks (16) distributed in a rectangular structure, and each positioning block (16) is installed on the welding platform (19) by a tightening piece; The power source mechanism includes two disc-shaped cam plates (6) symmetrically installed at the center of the rectangular structure formed by the positioning block (16), and one side of each disc-shaped cam plate (6) is correspondingly installed for The eccentric wheel device that drives the disk-shaped cam plate (6) to slide left and right is connected with a return spring device on the other side of the disk-shaped cam plate (6) opposite to the eccentric wheel device; The linkage mechanism includes two symmetrically installed pressing plates (8), on each pressing plate (8) an inner pressing block (9) and an outer pressing block (10) are sequentially installed at intervals, and one end of the pressing plate (8) The end is fixed on the disc-shaped cam plate (6) by a roller (7), and a slider (11) is connected to the bottom of the other end of the pressure plate (8), and the bottom of the slider (11) is correspondingly provided with a slide A guide rail (12) on which the block (11) slides, said guide rail (12) being mounted on a welding platform (19). 2. The purely mechanical welding fixture according to claim 1, characterized in that: the eccentric wheel device comprises a cam rotating column (5), a cam (2), a handle (1) and a tightening screw (3), the The lower end of the cam rotating post (5) is fixed on the welding platform (19), and its upper end passes through the top surface of the cam (2) and is threaded with the tightening screw (3). The side wall of the disc-shaped cam plate (6) is tight and the cam (2) can rotate along the cam rotating column (5), and the handle (1) is hinged on the cam (2). 3. The purely mechanical welding fixture according to claim 2, characterized in that: a compression washer (4) is installed between the tightening screw (3) and the cam (2). 4. The purely mechanical welding fixture according to claim 1 or 2, characterized in that: through holes are evenly spaced on the pressing plate (8), and the inner pressing block (9) and the outer pressing block ( 10) Correspondingly fixed on any through hole through the mounting piece. 5. The purely mechanical welding fixture according to claim 3, characterized in that: the return spring device comprises an L-shaped base (15) and a plurality of springs (13) arranged parallel to each other, each spring (13) A spring guide post (14) with telescopic elasticity runs through the inside, one end of the spring guide post (14) is connected to the side wall of the disc-shaped cam plate (6), and the other end is fixed to the L-shaped base (15 ), the L-shaped base (15) is installed on the welding platform (19).