German HOFFMANN tools HOFFMANN models HOFFMANN prices

HOFFMANN tools are material handling tools for lifting or jacking heavy loads, a type of intermittent-duty tool for lifting heavy objects. Most lifting tools begin a vertical or combined vertical and horizontal working stroke after the lifting gear picks up the load, unload at the destination, then return empty to the pickup point to complete one work cycle, before performing the second lift. Generally, during operation, picking up, transporting, and unloading are carried out sequentially, and the operation of each corresponding mechanism is intermittent. Lifting tools are mainly used for handling piece goods; equipped with a grab bucket, they can handle bulk materials such as coal, ore, and grain; equipped with a ladle, they can lift liquid materials such as molten steel. Some lifting tools, such as elevators, can also be used to carry people. In certain application scenarios, lifting equipment is the main operating tool; for example, cranes for loading and unloading materials at ports and stations are the main operating tools.

HOFFMANN tool features

1) Air is easily available, and the operating pressure is low; used air can be discharged locally without the need for return pipelines. 2) Air has low viscosity and low flow resistance loss, facilitating centralized air supply and long-distance transmission. 3) Pneumatic actuators have high motion speeds. 4) Pneumatic systems have strong adaptability to the environment; they can operate reliably in wide temperature ranges, humid and dusty environments; slight leaks do not pollute the environment; there is no risk of fire or explosion, ensuring safe use. 5) Simple structure, easy maintenance, and low cost. 6) Long service life of pneumatic components. 7) The output force of pneumatic components is smaller than that of hydraulic systems; they move faster, have strong adaptability, can operate in harsh environments such as flammable, explosive, dusty, humid, and impact-prone conditions, do not pollute the environment, have a long service life, simple construction, easy maintenance, and low price.

HOFFMANN tool structural composition

The function of power components is to convert the mechanical energy of the prime mover into the pressure energy of the fluid. This refers to the oil pump in the hydraulic system, which provides power to the entire hydraulic system. The structural forms of hydraulic pumps generally include gear pumps, vane pumps, and piston pumps. The function of actuating components (such as hydraulic cylinders and hydraulic motors) is to convert the pressure energy of the fluid into mechanical energy, driving the load to perform linear reciprocating motion or rotary motion. Control components (i.e., various hydraulic valves) control and regulate the pressure, flow rate, and direction of the fluid in the hydraulic system. According to different control functions, hydraulic valves can be divided into pressure control valves, flow control valves, and directional control valves. Pressure control valves are further divided into relief valves (safety valves), reducing valves, sequence valves, pressure relays, etc.; flow control valves include throttle valves, adjustment valves, flow divider-combiner valves, etc.; directional control valves include check valves, pilot-operated check valves, shuttle valves, directional valves, etc. According to different control methods, hydraulic valves can be divided on/off control valves, fixed-value control valves, and proportional control valves. Auxiliary components include oil tanks, oil filters, oil pipes and pipe fittings, sealing rings, pressure gauges, oil level and oil temperature gauges, etc. Hydraulic oil is the working medium for transmitting energy in hydraulic systems, including various mineral oils, emulsions, and synthetic hydraulic oils.

HOFFMANN tool usage

1) Adjustment of the plane blade: When installing the plane blade, first fit the blade with the cap iron properly, control the distance between the cutting edges of both, and then insert it into the plane body. The cutting edge should be close to the sole; add the wedge, press down slightly, hold the left corner of the sole with the left hand, and use the thumb to firmly hold the wedge, cap iron, and plane blade. Use a hammer to correct the cutting edge so that it protrudes from the mouth. The amount of protrusion is proportional to the cutting depth; more for rough planing, less for fine planing. To check the protrusion of the blade, lift the plane with the left hand, sole facing up, and look backward with one eye to detect it. If the protrusion is inappropriate, lightly tap the upper end of the blade. If it protrudes too much and needs to be retracted, lightly tap the rear end of the plane body. If one corner of the cutting edge protrudes, only lightly tap the upper side surface of the same corner of the blade. 2) Key points for pushing the plane: When planing, extend the index fingers of both hands forward to press down on the plane body, press the rear part of the blade with the thumbs, and grip the handle tightly with the remaining fingers and palms. Keep the plane body level and apply uniform force with both hands. When pushing forward, increase the force with both thumbs, apply slight pressure with the two index fingers, and gradually reduce the pressure when reaching the front end until no pressure is applied. When retracting, slightly lift the rear part of the plane body by hand to avoid dragging the cutting edge on the wood surface, which can cause dulling. When planing long stock, the left foot should be forward, followed by the right foot. Before planing long stock, check whether the surface to be planed is heartwood or sapwood; generally, heartwood is cleaner and has clearer grain than sapwood. If it is heartwood, plane in the direction from the root to the tip; if it is sapwood, plane in the direction from the tip to the root. Planing along the wood grain saves effort. Otherwise, it is easy to cause "tear-out," resulting in a rough, uneven surface and requiring significant effort. When starting to plane, the sole should be tightly against the wood surface; do not lift the front of the plane at the beginning. When reaching the end, do not let the front of the plane dip (commonly known as "nodding"). Otherwise, the middle part of the planed wood surface will bulge and be uneven, which is a common mistake among beginners and must be corrected.

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