Structure analysis of European version of jaw crusher (2)
The structure of the jaw crusher is relatively simple, mainly composed of a frame, a working mechanism, a transmission mechanism, a regulating device, a safety device and a lubrication system. Take the 900mm×1200mm simple pendulum jaw crusher as an example to briefly introduce its structure.
4. Adjusting device
The liner of the crusher is constantly worn by the ore during work, which makes the width of the discharge opening gradually larger. In order to ensure the requirements of product particle size, the width of the discharge opening must be adjusted in time. There are the following 3 types of commonly used discharge opening adjustment devices.
(1) Pad adjustment device
The 17 in Figure 1 above is the pad adjustment device. A set of adjustment pads are placed behind the rear thrust plate support. When the number or thickness of the pads is changed, the rear thrust plate is moved forward or backward to achieve the purpose of adjusting the width of the discharge opening. This kind of adjusting device has a simple and compact structure, and the weight of the whole machine is not increased much. Therefore, large and medium-sized jaw crushers are often used. The disadvantage is that it must be stopped during adjustment.
(2) Inclined iron adjusting device
The inclined irons 6 and 7 in Figure 3 are used to adjust the width of the discharge opening. It uses bolts or worm gears or chain drives to raise and lower the rear inclined irons. The front inclined irons are installed in the guide grooves of the two side walls of the frame and can only move horizontally. When the rear inclined iron is lifted, the front inclined iron moves forward along the guide groove due to the relationship of the inclined surface, the thrust plate and the movable jaw move forward, and the width of the discharge opening decreases accordingly.
Conversely, when the rear inclined iron drops, the width of the discharge opening increases. The advantage of this kind of adjustment device is that it can realize stepless adjustment, and there is no need to stop during adjustment. The disadvantage is that the adjustment is very laborious, and the size of the whole machine is increased, so it is only suitable for medium and small jaw crushers.
(3) Hydraulic adjustment device
This adjusting device uses hydraulic cylinders and plungers to adjust the width of the discharge port, and uses manual or electric hydraulic pumps to supply oil to the hydraulic cylinders. The 900mm×1200mm hydraulic simple pendulum jaw crusher shown in Figure 4 uses a hydraulic adjustment device.
When adjusting, first loosen the nut of the tension spring, open the shut-off valve (usually closed), start the hydraulic pump motor, and fill the two horizontal hydraulic cylinders at the rear of the frame with oil, and the plunger pushes the wedge iron forward , When moving to the desired position, close the shut-off valve and adjust the thickness of the gasket.
After adjustment, open the shut-off valve. The hydraulic cylinder is pressed back to the oil tank by the backward pressure of the movable jaw, thrust plate and connecting rod of the crusher, and the tension spring is compressed to a certain position before closing the shut-off valve.
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