SU926384A2 - System for automatic discharging of mechanical lock - Google Patents

Description

I

 This invention relates to mechanical engineering.

According to the main auth. No. 22bZb4 is a known system of automatic unloading of a mechanical lock comprising a ram, a three-position control valve, a check valve and a device consisting of a housing, a non-return valve, a piston, a return spring and a one-way throttle, the end of which is connected to the control valve, and the other two holes alternately connected to the cavities of the cylinder 1.

The disadvantage of this system is the presence of a reverse stroke, the piston of the power cylinder when the system is turned on and the piston is in an intermediate position (t, it is in the position when the piston of the cylinder is not locked with a mechanical lock). The presence of the reverse stroke is due to the fact that when the three-position control valve is turned on for cleaning the piston of the cylinder.

The device initially directs the flow of working fluid into the cavity of the cylinder opposite to its cavity provided with a mechanical lock. In this case, the piston of the cylinder extends, i.e. the reverse required piston + n stroke occurs,

Only after the piston in the device body moves from one edge to another, does the fluid flow into the cylinder cavity, equipped with a mechanical lock, and the cylinder piston begins to retract.

IS

The magnitude of the return stroke of the piston can reach considerable sizes, especially in the absence of a load on the piston of the cylinder, since this reduces the pressure supplied.

Claims (1)

30 mine to the end of the housing, and therefore the time for moving the piston in the housing from one position to another is extended. The purpose of the invention is the possibility of eliminating the return stroke of the piston of the power cylinder at its intermediate positions. This goal is achieved by the fact that the automatic unloading system of the mechanical lock is equipped with a mechanically controlled check valve installed in the hydraulic line connecting one of the device housing holes to the piston cavity of the hydraulic cylinder, the control mechanism of the check valve being designed as a pusher connected to the hydraulic cylinder piston . The drawing shows the system of automatic unloading mechanical lock. The system contains a device consisting of a housing 1 with a piston 2 installed in it, having a non-return valve 3, the piston being spring-loaded relative to the housing 1 by a spring C, the butt end of the housing is connected to the control line 5 with a control valve 6. In the hydroline 7 is installed Two holes 9 and 10 of the housing 1 are alternately communicating with the cavities of the cylinder 11, respectively, of the piston 12 and the rod 13. In the hydraulic line 14 connecting the opening 9 of the housing 1 of the device with the cavity 12 of the hydraulic cylinder 11, a mechanically controlled return valve 15 is installed. which comes with the piston 16 of the hydraulic cylinder 11 with the extreme lockable mechanical lock of the CMM, the position of the latter. This check valve 15 prevents, in the closed position, the passage of fluid from the opening 9 of the housing 1 to the cavity 12 of the hydraulic cylinder 11. The cavity 13 of the hydraulic cylinder 11 communicates with the hole 10 in the housing 1 by hydraulic line 17. The control mechanism of the check valve 15 is designed as a pusher 18 connected with piston 16. In housing 1, channels 19 and 20 are made, in piston 2 are grooves 21-23, and in hydraulic cylinder 11 piston 2k and collet 25 are installed. The system works as follows When the control valve 6 is turned on for cleaning piston 16 of hydraulic cylinder 11 fluid enters gi 5 lines to the end of the housing 1, opens the check valve 3 and through the groove 23 in the piston 2 enters the hole 9 in the housing 1 and further, through the hydroline 1 - to the valve 15. With the polo 9 4 open valve 15, which takes place at fixed mechanically locking the position of the piston 1b, the liquid passes through it and enters the cavity 12 of the hydraulic cylinder 1. The piston 16 moves to the left until it stops at the hydraulic cylinder 11, and a gap is formed between the contacting conical surfaces of the collet 25 and the hydraulic cylinder 11, which function as stops. In this case, an external compressive load applied to the piston 16 is removed from the mechanical lock. Drainage of fluid from the cavity 13, when the piston moves .16 to the left, is carried out along the hydraulic line 17 through the bore 21 made in the piston 2 and connecting the holes 10 and 20 in the housing 1. Since the working fluid coming from the control valve 6 to the end of the housing 1 is affected by the piston 2, it moves to the right at a speed determined by the throttle 8. During the movement, the groove 23 on the piston 2 communicates with the opening 9 in the housing 1, at the same time openings The connection between the housing 1 and the cavity 12 of the hydraulic cylinder 11 is blocked by the piston 2, thereby keeping the piston 16 in the left extreme position, and a gap is maintained between the contact surfaces of the collet 25 and the hydraulic cylinder 11. The working fluid begins to flow into the cavity 13 of the cylinder and, acting on the piston 2k, shifts it to the left, releasing the collet 25. When there is a contact between the collet 25 and the hydraulic cylinder 11, the mechanical lock opens when there is no load on its elements. increase its reliability and durability. Upon further movement of the piston 2, the annular groove 22 communicates the cavity 12 of the hydraulic cylinder 11 with the channel 19 in the housing 1. The working fluid from the cavity 12 of the hydraulic cylinder 1 through the valve 15, which does not prevent the fluid from flowing in this direction, goes to the drain. The piston 16 is cleaned. When the control valve 6 is turned on to clean the piston 16 at its intermediate positions, the working fluid enters the valve 15, which is then closed and, therefore, blocks the access of the liquid to the hydraulic cylinder cavity 12. The piston 16 remains stationary. After moving the piston 2 in the housing 1 from one extreme position to another, the working fluid begins to flow into the cavity 13 of the hydraulic cylinder, the cavity 12 communicating with the drain. There is a cleaning of the piston 16 of the hydraulic cylinder. Thus, the return stroke of the piston at its intermediate positions is eliminated. Claims of the invention. System of automatic unloading of a mechanical lock according to the author. No. 22636, characterized in that, in order to eliminate the back stroke of the ram of the power cylinder at its intermediate positions, it is equipped with a mechanically controlled non-return valve installed in the hydraulic line connecting one of the housing holes of the device: The control mechanism of the check valve is designed as a push rod associated with the piston of the hydraulic cylinder. Sources of information taken into account in the examination 1. USSR author's certificate V 22636, cl. F 15 B 15/02, 19b9.