What is the component structure of Type 80 machine gun?

Type 0 machine gun (PKmC machine gun) adopts the automatic way of long recoil of pneumatic piston, which absorbs the advantages of many families in structure. Its bolt system is taken from AK's rotary lock bolt; The muzzle device is taken from the American m60 general machine gun; The auxiliary ammunition supply structure and barrel replacement method are taken from Su сгм heavy machine gun; The plucking mechanism is taken from Czech Vz52 light machine gun and improved. The tripod is an improvement on the tripod designed by Leonid Stroeve.

Type 80 machine gun adopts nose rotation locking mechanism. After firing, the projectile moves forward under the action of gunpowder gas. When the projectile passes through the air hole, part of the gunpowder gas enters the air chamber through the air hole, impacting the piston and the connected gun rack to move backwards. The striker on the latch frame moves backward, and the striker retracts into the latch. Under the interaction of bolt-shaped bamboo shoots and bolt-shaped grooves, the bolt rotates to open the bolt. After that, the bolt holder and the bolt holder continue to retreat together. In the process of retreating, the actions of taking bullets, pulling shells and throwing shells are completed, and the bolt holder compresses and returns to the spring.

After the bolt holder is retracted into position, it will re-enter under the action of the return spring if it is not caught by the resistance iron. The rear plane of the gun rack positioning groove pushes the rear plane of the machine head to make the bamboo shoot shape forward. When it moves to a certain position, the pre-rotation inclined plane on the box collides with the pre-rotation inclined plane on the machine head, forcing the machine head to start to rotate to the right, so that the rear plane of the shaping bamboo shoots of the machine head is separated from the rear plane of the positioning groove of the gun rack, rotates to the right along the locking helicoid of the gun rack, and enters the locking groove on the barrel sleeve to realize locking. Subsequently, the gun rack continued to move forward, and the firing pin was driven forward to hit the primer of the bullet.

The 80-type machine gun uses the bullet chain to supply bullets, transports bullets when retreating, and supplies bullets in two ways. The bullet hook is located above the gun frame. When the gun frame starts to move backwards, the bullet hook starts to extract bullets from the sub-bullet chain and pull them back. At the same time, the bullet-feeding helicoid on the gun frame pushes the roller on the plucking arm to make the plucking arm rotate to the left, and the plucking teeth drive the chain to move toward the center. When the gun rack continues to retreat, the pressure bullet on the bullet cover moves the bullet to the axis of the gun bore under the action of spring force.

When the bottom edge of the bullet is at the same angle with the axis of the magazine, the curved surface of the spring plate on the receiving cover acts on the bottom edge of the bullet, so that the bullet leaves the hook and enters the slot of the receiving seat. When the gun rack of the bolt machine re-enters, the nose pushes the bottom edge of the bullet, and the bullet enters the bore according to the bullet entry route under the action of the guide groove of the bullet seat.

The drawing mechanism of the 80-type machine gun is unidirectional, the crank-shaped drawing arm is installed in the case, the roller at the left lower end of the drawing arm is locked with the arc groove on the left side of the gun rack, and the protrusion on it is locked with the guide rib on the right side of the gun rack to form a rotating shaft. When the pin rack is bounced back, the part of the plucking arm below the pin rack moves from left to right, while the part above the pin rack moves to left and lifts at the same time.

During the whole movement, the bullet pulling teeth at the top of the bullet pulling arm pull the bullet from the chain to the bullet pulling plate, and the elastic bullet retaining teeth installed on the bullet receiving cover catch and locate the bullet, thus realizing the bullet feeding process from right to left.

The 80-type machine gun has dust covers at the shell throwing port, the bullet conveying port and the bullet chain outlet. Before the bullet hits the shell-throwing tappet, the ejector pin raised on the left side of the gun rack opens the dust-proof cover at the shell-throwing opening on the shell to prepare for shell-throwing, and the dust-proof cover automatically closes after shell-throwing. When the frame of the gun moves backward, the dust cover at the outlet of the chain will be opened.

Type 80 machine gun is a deflation adjusting device, and the energy required for the gun rack to retreat depends on the amount of deflation. A circular hole with a diameter of 3.5 mm and a long hole with a width of 3.5 mm are asymmetrically distributed on both sides of the regulator. When the regulator is in the position of 1, these two holes are opposite to the circular holes on both sides of the air guide hoop, and both sides are exhausted, so as to minimize the retreating energy of the gun rack.

When the regulator is in position 2, only one hole is opposite and only one hole is deflated, which increases the retreating energy of the gun rack. In position 3, the regulator closes the two holes of the air guide hoop, so there is no air to be exhausted and the energy is maximum. When adjusting, only one bullet or shell is needed, which is very convenient for maintenance. However, when the deflation is asymmetric, it will affect the firing accuracy of the machine gun.

The firing mechanism of the 80-type machine gun is a translation hammer firing mechanism, which uses a composite spring to push the gun frame to fire the needle. The launching mechanism consists of a trigger, a ferroresistor, a ferroresistor spring, a fuse, a trigger shaft, a limit pin and a limit pin spring, all of which are installed on the transmitter base.

The insurance institution is compulsory insurance. When the safety is in the firing position, the blocking iron is lifted under the action of spring force, and the locking height with the gun frame is not less than 2mm. When the trigger is pulled, the piezoresistive iron drops and the gun rack is released. When the safety is in the safety position, forcibly lift the stop iron to ensure that the trigger will not be detached from the gun rack. When the bolt bracket is in the front position, fix it, and the contact height between the rear end face of the bolt bracket and the front safety tooth on the trigger is more than 2mm, so as to avoid the bolt bracket from locking with the iron stopper to cause failure or damage to parts.

The mechanical sight of type 80 machine gun consists of an arc scale and a cylindrical sight. The instrument and instrument base are installed on the bomb receiver cover. The notch of the photo door on the scale plate is rectangular, and the width is1.3mm. The scale plate is engraved with horizontal divisions, each with 2 pitches, which can be adjusted at the distance of 100 m ~ 1500 m. The sight is composed of a quasi-constellation, a sight slider and a sight, with simple structure and the most convenient adjustment. The sight slider is closely matched with the quasi-constellation, and the line of sight deflection can be corrected after applying force. Compared with 8 1 and 67-2 machine guns, it is easier to adjust.

The gun frame of heavy machine gun is a light elastic frame, and a sliding hoe is used. The gun rack consists of an upper shelf and a lower shelf. The upper frame and the lower frame are inseparable, and the upper frame is composed of gun frame, support rod, vertical shaft, height setting handle, fine aiming machine and other parts. Clamped by a cam. When shooting, the whole gun translates backwards, so you must shoot at the shoulder. Directional limiter is two thin and elastic components, which can slide on the toothed plate to limit the directional shooting boundary.

The lower frame consists of three racks, a toothed plate, a brake handle and a vertical shaft seat. The three frames are formed by stamping and welding thin steel plates. The cross-section is approximately rectangular, with variable cross-section, thick on the top and thin on the bottom, good rigidity and light weight. The frame rod is connected by end teeth, pressed by disc spring, and the height of live wire can be adjusted. These three poles can be folded. Plastic pads are installed on the two rear frame poles, which is convenient for the shoulders when marching. There are hooks welded on the pole, so it is unlucky to March for a long time. A magazine bracket is also welded on the right frame rod. Shooting the magazine on the gun frame can increase the weight and is beneficial to the shooting accuracy. Because there are two poles at the back, the accuracy on the direction shooting boundary is better.

In order to facilitate mediation and use, the Type 80 machine gun is also equipped with a fine aiming machine. The taper sleeve is adjusted to a certain degree of tightness in advance, and the support frame moves up and down through the rotation of the eccentric shaft to achieve the functions of fine adjustment and automatic tightening.

The tripod of the Type 80 machine gun can be folded back and forth at the air guide hoop of the barrel. When in use, the bipod with this configuration can improve the adaptability of the machine gun to various terrains. For some fortifications and perforations, the bipod can also be extended without affecting the use.

Type 80 machine gun is very convenient to use. When replacing the barrel, just pull the handle to separate the barrel from the gun body. When shooting, you can avoid burning your hands because of the hot barrel. The butt of the gun doubles as an accessory tube, which is convenient for cleaning and maintaining weapons in the wild.