What is a Welding Table?

Welding table refers to the table set for welding small welding parts. The surface of the welding worktable generally has T-slots or holes for easy use. The welding platform material is generally HT200 or HT250. These two materials account for more than 98% of the welding platform material. They can meet the requirements of welding workpieces and are relatively inexpensive. Whether it is the tensile strength, hardness, The wear resistance can meet the welding requirements.

The table consists of a base, a column, a compacted beam, a moving structure, a carriage base, a linear guide and a slider structure, a motor reducer combination, a coupling, a rack and pinion assembly, an electric cylinder, a carriage working platform, and a carriage. Support wing, compaction shaft, compaction shaft rotating shaft, compaction block, air bag, manual directional valve, bottom plate; its advantages are synchronous lifting and moving, high precision, smooth electric movement, stable compaction, improving welding quality, shortening Prepare time and improve work efficiency.

For soldering and unsoldering of through-hole and surface mount components. The welding table adopts a high-power, long-life ceramic heater and has closed-loop feedback temperature control, so it can obtain efficient and accurate welding.

A multi-angle rotary welding table is composed of a table body, a table base, a hydraulic oil cylinder, a cylinder seat, a worm, a worm wheel, and a table. The table body is tapered, the lower end taper is 90 degrees, and the lower end is connected to the table base through a shaft. One end of the hydraulic oil cylinder is connected to the cylinder seat through a shaft, and the other end is connected to the lower end of the table through a shaft. A worm is fixed in the table, the worm is connected to the workbench, and the operation handle is connected to the turbine. The utility model enables the workpiece to be fixed at an arbitrary position within a range of 90 degrees in the vertical direction and a range of 360 degrees in the horizontal direction along with the worktable, to perform work processing, convenient operation, and welding quality can be guaranteed.

The three-dimensional combined welding work table is in the form of a perforated grid plate, with two series of apertures D28 and D16. On a high-precision table, round holes of D28 are distributed every 100mm or round holes of D16 are uniformly distributed every 50mm. These holes can be used to stitch positioning modules and fixtures with various functions. In addition to the table, various functional modules include positioning blocks, right-angle blocks, columns, arbitrary angle adjustment, V-shaped blocks, pin bolts, various fast fixtures, gap adjustment pieces and various auxiliary modules. The design of the module is clever and can be used in various combinations and repeated applications. Pins used to securely connect modules to each other. Three concentric steel balls are used inside. When the pin is released, the steel ball is retracted into the pin, and the pin can be easily inserted into the hole of the module. When gradually tightened by hand, the three steel balls gradually pop out, automatically center and clamp the module. After tightening with a wrench, the clamping force on the module can reach 5 tons and the shearing force can reach 25 tons.

The precision welding workbench is required to be used in conjunction with the argon arc welding machine to automatically complete the precision welding of horizontal circumferential seams.

1.Requirements for electrical control of welding process

(1) Spindle speed is 0.25 3.5r / m, digital display, precise preset and adjustment. Stable operation, no shock and vibration.

(2) Accurate control of horizontal loop seam overlap, digital display of welding length.

(3) Digital display of arc starting and ending time, preset adjustable.

2. Principle of control system

(1) Automatic welding control program

Place the workpiece on the fixture manually clamp the workpiece torch feed after the welding machine arcs for a certain period of time the workpiece is rotated for automatic welding after the welding length has been set the workpiece is automatically stopped arc closing the torch is absent the fixture Release remove the workpiece.

The entire control program is implemented with relays, which reduces manufacturing costs on the basis of satisfying reliability.

(2) Speed control system

In order to adapt to different welded workpieces, a large adjustment range of welding speed is required, good low-speed performance and high stability speed accuracy. Therefore, the control circuit uses a thyristor automatic adjustment system with a PID regulator composed of an operational amplifier as the central link. .

Kp is the magnification of the PID regulator; Kd is the magnification of the thyristor rectifier circuit; 1 / Ce is the magnification of the motor; is the feedback coefficient.

The grating disk installed on the end shaft of the DC motor converts the speed signal into a pulse signal, which is converted into a feedback signal Uf through digital-to-analog conversion, and is fed to the PID regulator at the same time as the given signal Ugd of the system. The output signal Up is in accordance with the PID law. Change, under the control of Up, the speed of the motor is adjusted to a stable given value. The other two pulse signals are sent to the counter, and the tachometer is displayed accordingly.

The speed regulation system solves the different contradictions of the system gain requirements of the general speed regulation system when it is static and dynamic, which not only improves the system hardness, but also makes the system work stably without shocks and vibrations. The stability performance is greatly improved, and the speed Precise presets and adjustments.

(3) Lap amount control

The grating disk installed on the end shaft of the DC motor has 60 long holes uniformly distributed in the radial direction. The motor rotates once and the counter counts 60. If the reduction ratio is i, the workpiece rotates once (rotation angle A1 = 2 ) The corresponding count value is C1 = 60i.

Let the weld overlap (arc length) be L, and its corresponding rotation angle be

A2 = 2L / D2

The count value corresponding to the overlap amount meets

C2 / C1 = A2 / A1

Then C2 = (L / D) C1

The corresponding count value should be set to

C = C1 + C2 = (1 + L / D) C1

By setting the counter value C, the overlap amount can be accurately controlled. ^[2]