CN203743499U - Slow-descending air-control distribution valve - Google Patents

Abstract

The utility model provides a slow-descending air-control distributing valve which comprises a valve body, a slide seal valve element, an air cylinder and a reversing piston disposed in the air cylinder. The slow-descending air-control distributing valve is characterized in that a slow-descending piston is disposed between the reversing piston and a cover plate, the slow-descending piston is matched with the air cylinder in a sealed manner, a first air inlet is formed between the reversing piston and the slow-descending piston and a second air inlet is formed in the cover plate. The mounting structure of a travel limit sleeve in the air cylinder is characterized in that a mounting step is disposed in the air cylinder, and the travel limit sleeve is in slide fit with the inner cavity of the air cylinder in a sealed manner and limits through the mounting step. An adjusting bolt is disposed at the center of the cover plate at the tail of the air cylinder. The head of the adjusting bolt extends into the air cylinder. During use, when slow-descending is needed, compressed air is fed into the second air inlet, the slow-descending piston pushes the reversing piston and the valve element to move a certain distance under air pressure to reduce an oil return passage, and reliable and stable slow-descending speed can be achieved. In addition, the mounting structure of the travel limit sleeve in the air cylinder is simple, and convenient to manufacture and assemble.

Description

Slow releasing pneuamtic controlled distributing valve

Technical field

The utility model relates to a kind of and matching used air control distribution valve that falls slowly function with constant speed of vehicle lifter HYDRAULIC CONTROL SYSTEM.

Background technique

In dumping engineering truck field, be widely used at present the lifting of the capacity of the tipping body that air control distribution valve controls.In the structure of air control distribution valve, generally use the three hole Pneumatic valves of the fertile type 200L/min in sea, the speed that this Pneumatic valve adoption rate control mode regulates large case to decline, speed regulates and adopts the rotation angle that is arranged on the hand control valve operating grip in operator cabin to realize control, but in actual use because operating mode is complicated and changeable, have and many times control the bad control of degree of accuracy declining, bad vehicle and the casualties of having caused of speed control when causing at a slow speed.

Summary of the invention

The purpose of this utility model is to provide slow releasing pneuamtic controlled distributing valve, by increasing control cylinder tube length degree and falling slowly piston, realizes reliably capacity of the tipping body descending at slow speed, eliminates the hidden danger that existing selector valve exists comprehensively, reaches safe working state.

For this reason, the technical solution of the utility model is: slow releasing pneuamtic controlled distributing valve, comprise valve body, slipper seal spool is installed in valve body, in valve body, be provided with input channel, output channel, drainback passage, be provided with step axle journal corresponding to input channel, output channel and drainback passage on slipper seal spool, the head of valve body is provided with plug, on valve body, be also provided with pilot operated compound relief valve connection mouth, filler opening on valve body is communicated with input channel, return opening on valve body is communicated with drainback passage, and the oil outlet on valve body is communicated with output channel; Cylinder block is connected to the afterbody of valve body, slipper seal spool is fixedly connected with the reversing piston in cylinder block, slipper seal spool is provided with return spring device, and what in cylinder block, be positioned at return spring device is provided with stroke limit cover below, and cylinder block afterbody passes through cover plate for sealing;

It is characterized in that: between reversing piston and cover plate, be provided with and fall slowly piston, fall piston slowly and cylinder block is sealed and matched, at reversing piston and fall slowly between piston and be provided with the first suction port, be on the cover board provided with the second suction port;

Stroke limit is enclosed within the mounting structure in cylinder block: in cylinder block, be provided with installation step, stroke limit cover is slipper seal with cylinder block inner chamber and coordinates, spacing by installation step.

Beneficial effect: the utility model is in the time of fast-descending state, slowly the inlet hole that falls piston does not have air pressure, the first suction port air inlet drives slipper seal spool to move right and will fall slowly piston to be pushed to afterbody under the effect of reversing piston, and now decline passway is all opened; In the time that needs fall slowly, the second suction port leads to people's pressurized air, falls slowly piston and move to left and promote reversing piston and spool and move a certain distance under gas pressure, drainback passage is reduced, thereby realize reliable and stable slow reduction of speed degree; In addition, it is simple that stroke limit is enclosed within mounting structure in cylinder block, is convenient to manufacture and assembling.

Brief description of the drawings

Fig. 1 is plan view of the present utility model.

Fig. 2 is plan view of the present utility model.

Fig. 3 is along B-B sectional view in Fig. 1.

Embodiment

As Fig. 1, Fig. 2, shown in Fig. 3, further describe the utility model as follows: slow releasing pneuamtic controlled distributing valve, comprise valve body 1, slipper seal spool 5 is installed in valve body 1, in valve body 1, be provided with input channel, output channel, drainback passage, on slipper seal spool 5 with input channel, output channel and drainback passage correspondence are provided with step axle journal, the head of valve body 1 is provided with plug 16, on valve body, be also provided with pilot operated compound relief valve connection mouth (under notconnect state, by ball formula plug 4 shutoff of rising), oil inlet P on valve body is communicated with input channel, oil return inlet T on valve body is communicated with drainback passage, oil outlet A on valve body is communicated with output channel, cylinder block 2 is connected to the afterbody of valve body, slipper seal spool 5(connects axle journal 8 by it) be fixedly connected with the reversing piston 9 in cylinder block, slipper seal spool is provided with return spring device, the stroke limit that is provided with below that is positioned at return spring device in cylinder block overlaps 7, and cylinder block afterbody seals by cover plate 3,

Described return spring device is routine techniques, is made up of the first spring seat 15, return spring 6, the second spring seat 13, spacing jump ring 12;

Between reversing piston and cover plate, be provided with and fall slowly piston 10, fall slowly piston 10 and be sealed and matched with cylinder block, at reversing piston 9 and fall slowly between piston 10 and be provided with the first suction port, on cover plate 3, be provided with the second suction port 11; The first suction port passes into pressurized air, for promoting reversing piston 9; The second suction port 11 passes into pressurized air, falls slowly piston 10 for promoting;

The mounting structure of stroke limit cover 7 in cylinder block: be provided with installation step 14 in cylinder block, stroke limit cover 7 is slipper seal with cylinder block inner chamber and coordinates, spacing by installation step 14; This mounting structure is simple, is convenient to manufacture and assembling.

Claims (1)

1. slow releasing pneuamtic controlled distributing valve, comprise valve body, slipper seal spool is installed in valve body, in valve body, be provided with input channel, output channel, drainback passage, be provided with step axle journal corresponding to input channel, output channel and drainback passage on slipper seal spool, the head of valve body is provided with plug, on valve body, be also provided with pilot operated compound relief valve connection mouth, filler opening on valve body is communicated with input channel, and the return opening on valve body is communicated with drainback passage, and the oil outlet on valve body is communicated with output channel; Cylinder block is connected to the afterbody of valve body, slipper seal spool is fixedly connected with the reversing piston in cylinder block, slipper seal spool is provided with return spring device, and what in cylinder block, be positioned at return spring device is provided with stroke limit cover below, and cylinder block afterbody passes through cover plate for sealing;

It is characterized in that: between reversing piston and cover plate, be provided with and fall slowly piston, fall piston slowly and cylinder block is sealed and matched, at reversing piston and fall slowly between piston and be provided with the first suction port, be on the cover board provided with the second suction port;

Stroke limit is enclosed within the mounting structure in cylinder block: in cylinder block, be provided with installation step, stroke limit cover is slipper seal with cylinder block inner chamber and coordinates, spacing by installation step.