The front beam is composed of four main bars, two side bars, a top plate and a web plate. It is hinged with the top beam, balanced by the front beam jack, and can swing up and down 15? , in order to maintain good contact with the top coal, keep the top coal above the shearer roadway, so as to ensure the normal operation of workers and the normal operation of shearer and front conveyor. Telescopic beam is a sliding part sleeved on the front beam. It is a box structure composed of roof, webs and vertical rods. The telescopic beam jack is used to support the newly exposed top coal after cutting by the shearer in time, with the maximum telescopic amount of 700 mm The fender is hinged with the telescopic beam, and its action is controlled by the fender jack, which is used to prevent the coal wall from falling off and the front falling off. At most, the fender can swing to be flush with the top coal.
x？ pillar; mainstay
2. Top beam
The top beam directly contacts with the top coal, directly bears the top coal pressure, cuts off the top coal in the goaf and makes the top coal cap fall off, which is one of the main bearing components of the hydraulic support. The top beam is welded into an integral box structure by four main reinforcing plates, several transverse ribs and upper and lower cover plates. Four front and rear column seats are welded in the four main reinforcement spaces, which are in spherical contact with the ball head at the top of the mechanical extension rod of the column; A hinge point is arranged between the front column seat and the rear column seat to be hinged with the upper connecting rod; The front part is hinged with the front beam, and the rear part is hinged with the tail beam assembly. Three sleeves are welded at the front and back of the top beam box, and each sleeve is equipped with a side push spring, which is connected with the side guard plate through a side lead-out rod. The two jackets are equipped with side push jacks, which are also connected with the left and right side guard plates through side lead-out rods. A valve frame is welded between the two front column seats of the top beam and provided with a group of main control valve groups; The front part is also provided with two ear seats hinged with the front cross beam jack.
Tail truss
3. Tail beam and coal retaining plate
Tail beam is used to bear part of the load of top coal, rocks and other objects, cover the working space at the back of the working face, prevent coal or rocks from entering the working space of the rear conveyor, and ensure the normal work of operators and the rear conveyor. The tail beam is also welded into a box body by main reinforcement, transverse reinforcement and upper and lower cover plates, the upper end is hinged with the rear end of the top beam, the middle part is hinged with the tail beam jack, and the middle and lower parts are sleeved with a coal caving plate and a coal caving plate jack; On its two sides, similar to the top beam, a fixed side guard plate and a movable side guard plate opposite to the top beam are respectively installed through a side pushing device. The coal discharge plate is not only used for discharging coal, but also plays the role of shielding the space of the rear conveyor to ensure the normal work of the rear chute. The expansion and contraction of the insert plate is controlled by the coal caving jack, the maximum expansion and contraction of the working face support is 800mm, and the maximum expansion and contraction of the transition support is 1000mm, so as to realize the role of coal caving and coal crushing.
4. Upper connecting rod, front connecting rod and rear connecting rod
The four-bar linkage is composed of an upper connecting rod, a front connecting rod, a rear connecting rod and a top beam hinged with the base, so that the bracket forms a complete up-and-down movement whole, and the bracket moves along a certain lemniscate trajectory, thus ensuring the top control distance of the bracket, and bearing large horizontal force and lateral force of the bracket at the same time, so that the bracket has torsion resistance. The four links of the bracket are wide-body inverted four links, in which the upper link is a wide-body box structure, the upper end is hinged with the top beam, the middle part is hinged with the rear link, and the lower part is hinged with the front link. The front connecting rod is a coarse two-force rod, the other end of which is hinged with the base except the upper connecting rod, and the rear connecting rod is also a long box with two ends hinged with the upper connecting rod and the base respectively.
basis
5. Base
The base is an important bearing part of the whole support, and its main function is to transfer the pressure from the top plate of the support to the bottom plate, so the base should have sufficient stiffness and strength and meet the requirements of specific pressure of the bottom plate. The base is also box-shaped, and there are four column seats for setting upright posts in the front and rear, the middle and rear parts are connected with the front connecting rod and the rear connecting rod, and there is also a column seat hinged with the tail beam jack in the rear part; The front part is provided with a bridge plate, the bridge plate is provided with an ear plate connected with the ejector, the middle part is provided with an empty groove for placing the ejector device, and the side surface is provided with a movable ear seat for pulling and sliding the ejector.
6. Side guards are installed on both sides of the top beam and tail beam of the side guard bracket, which are divided into two states: fixed and movable, and are mainly used to ensure good contact between brackets, so as to adjust the distance between brackets, prevent coal leakage and gangue leakage between brackets, and play a certain anti-dumping role. When it is used, it is based on the fixed side guard plate, and the movable side guard plate on the other side is controlled by its side jack and spring device to expand and contract, and the maximum expansion and contraction amount is170 mm. Both supports are unilateral movable side guards.
7. Push rod The push rod consists of two sections, all of which are box-shaped, and the front end of the front push rod is connected with the joint connecting the front slide; The rear connecte lug seat of that rear push rod is connected with the piston rod of the jack; The two push rods are hinged with a horizontal pin shaft. The push rod and jack constitute a reverse frame pushing device, which not only meets the needs of pushing and sliding, but also increases the frame pushing force. Through the expansion and contraction of the jack, the push rod is driven to move in the slide way of the base, and the process of pushing the sliding and moving the rack is realized. Both brackets are equipped with two push rods. Because the swing angle of the front push rod increases, the support is especially suitable for upward mining or uneven floor mining conditions. The back slide jack and the flexible chain are connected with the back slide through a connecting seat, a pin shaft and the like, and the back slide jack is pulled back by expansion and contraction.
8. Sprayer
The spray bar is installed at the lower part of the tail beam of the coal outlet and equipped with three groups of nozzles, which has good atomization effect. The nozzle is aimed at the coal unloading port and the position where the coal slides down. With the start and stop of coal unloading, the switch is manually controlled by QJ 13G ball stop valve, which can reduce coal dust, disperse gas, improve working environment and ensure safe production.