A semi-trailer is a trailer whose axle is placed behind the center of gravity of the vehicle (when the vehicle is evenly loaded) and which is equipped with a coupling device that transmits horizontal and vertical forces to the tractor. Are Semi trailer accessories commonly used accessories? The commonly used semi-trailer accessories are: axle, suspension, spring, leg, potential, gas reservoir, coil, tire, relay valve, tightening rope, spare tire lifter, pull rod, traction pin, lights and so on.Let's have a detailed understanding with Custom semi trailer manufacturers.
Semi trailer accessories commonly used accessories are what
Trailer leg
Model size of semi-trailer leg:
Rated lifting capacity (Kg/pair) Rated static bearing capacity (Kg/pair) Stroke (mm)
D5000A 16000kg (16T) 28000kg 430-480 (17 "-19")
D25000B 28000kg (28T) 80000kg 430-480 (17 "-19")
Essential components of semi-trailer leg:
The main components of the legs are two-speed gear box, support sleeve, support rod, transmission screw (rocker) and support plate. The structure is extremely simple and the function is extremely vital.
Classification of trailer legs:
The trailer legs are divided into single action and linkage.
The single acting leg refers to the two sides of the separate operation. There are two rockers, each leg has a gear box.
Linkage leg refers to 1 side operation on both sides, only 1 rocker, is a gear box with 1 and 1 without the composition.
Trailer lifting leg:
The lifting leg is composed of a branch plate, a supporting leg, a transmission mechanism, a variable speed mechanism, a transmission rod and a handle, etc., which is arranged in the front end of the semi-trailer. When the tractor and semi-trailer detached, they used to support the semi-trailer parking. In order to adapt to the changes in the height of the semi-trailer, the legs are equipped with a spiral lifting mechanism, so that the connection and disengagement of the semi-trailer and the tractor can be carried out smoothly. There are two speeds for altitude rise and fall. When the handle enters, it rotates at elevated speed, and when the handle pulls out, it is at low speed. When the branch plate touches the ground, the leg will bear the load. At this time, it can only be lifted at low speed, otherwise the lifting mechanism of the leg will be damaged.
Trailer brake air chamber brake sub-pump trailer brake air chamber classification:
The brake chamber of the trailer is divided into single chamber and double chamber, which can also be claimed to be single chamber and double chamber. Connection and difference between double air chamber and single air chamber:
1. The driving brake cavity of the double cavity brake air chamber of the braking system is the action of air pressure on the diaphragm to push the push rod, and the parking cavity is the action of compression spring to push the push rod.
2. The determining factor of the selection of single chamber and double chamber is whether the bridge is equipped with parking brake. The parking brake of the air brake system is realized by the compression spring of the double chamber, that is, only the double chamber can realize the parking brake. The single cavity brake chamber has only the service brake chamber, which can not realize parking braking.
3, from the safety point of view, air brake system vehicles need service brake and parking brake, so the car must be equipped with a double chamber, but do not have to install a double chamber on each bridge that can meet the requirements of parking brake, so some bridges are equipped with a single chamber.
Classification of trailer traction seat:
The Trailer traction seat is divided into 50# and 90#, which is classified according to the traction pin equipped, and is also divided into single pendulum and double pendulum traction seat, single pendulum traction seat is the saddle swing can only swing back and forth, double pendulum traction seat is the traction seat can swing back and forth and can swing around.
Assembly requirements for traction seat:
(1) Lubrication points should be set on the moving parts as required, and the oil cup should be filled with grease;
② The movement should be flexible, there should be no loose kuang, block, stuck phenomenon;
③ Pull rod operating force No. 50 traction seat should not be greater than 450N, 90 traction seat should not be greater than 550N;
(4) The hook and the traction pin should be able to reliably combine and lock automatically, and the clearance should be adjustable, and the regulating mechanism should be able to lock and insure.
Trailer suspension Trailer suspension
Classification of semi-trailer suspension:
Semi trailer suspension has German suspension, American suspension, air suspension and single point suspension.
Trailer suspension function:
Semi-trailer suspension is normally a series of balanced leaf springs fastened to the axle body with U-bolts, which withstand vertical forces and absorb vibration. The horizontal force is transferred by the bracket and the connecting rod. Since the balance beam can swing in a certain range, the load of the rear axle can be balanced in a certain range when the car group passes the uneven road surface. The material of the hanging plate spring of the trailer is 60si2mn, and the number of plate pieces of the hanging plate spring is typically 8, 10, and 13, or different pieces can be provided according to customer requirements.
Tow pin for trailer
The traction pin is connected to the tractor semi-trailer together and bear the essential connection part of the traction, when the in starting, braking and driving on the ramp, the impact of bigger, so you must have sufficient strength and toughness, and at the same time, due to the traction pin and saddle frequently hit each other and generate relative motion, so the connection need to wear thus must have high surface hardness. Therefore, traction pins are normally forged with l8CrMnTi alloy structural steel and carbrized and quenched to make the core toughness and surface hardness. Because of the essential role of this part, it must be inspected one by one, no cracks and manufacturing defects are allowed. Traction pins can be connected to semi-trailers in welded and bolted ways. The Bolt connection structure is convenient for replacing worn or damaged traction pins, and it is also convenient for replacing traction pins of different specifications. High-strength bolts are used for bolt connection, and their tightening torque is 130Nm.