CN2154927Y

CN2154927Y - Pressure feedback hydraulic impact apparatus

Info

Publication number: CN2154927Y
Application number: CN 92243127
Authority: CN
Inventors: 肖健
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-26
Filing date: 1992-11-26
Publication date: 1994-02-02
Anticipated expiration: 2002-11-26

Abstract

The utility model relates to a hydraulic impact apparatus used for equipment for rock breaking and hydraulic impact, which is characterized in that pressure is used as a feedback signal for controlling piston motion, and the unchanged magnitude of output impact energy for each time can be realized. A pressure signal control valve is used as pressure feedback control components for the hydraulic impact apparatus. The pressure feedback control components are matched with a commutation cone valve and a piston cylinder structure, and the system working pressure can achieve definite values. The stroke motion of the piston can be started after an accumulator is stored with enough energy so as to ensure the same piston impact energy for each time. The utility model is suitable for hydraulic impact equipment which can keep stable impact energy and can change impact frequency via the adjustment of system oil supply flow quantity.

Description

Pressure feedback hydraulic impact apparatus

The utility model belongs to a kind of hydraulic machinery in mining machinery hydraulic pressure and pneumatic field, is mainly used on rock breaking device and the hydraulic impact equipment.

Hydraulic impactor is the main frame of hydraulic gate and hydraulic lithotriptor and other hydraulic impact equipments.Existing hydraulic pressure can be divided into towards device valve class and valveless class.There have the valve class to use to be more, and the valveless class is superseded substantially; There is the valve class to be divided into single face oil return and two kinds of patterns of two-sided oil return again; Structure according to valve can be divided into multiple kind again.The hydraulic impactor of all these kinds, though it is various in style, but basic principle all is to utilize high pressure oil as energy transmission medium, under the effect of hydraulic coupling,, hydraulic fluid port on the cylinder wall is opened or closed control selector valve to change oil circuit in different positions with piston motion, realize the piston automatic reciprocating motion, and outwards impact the output impact energy.To see on the oil circuit control mode, these hydraulic impactors all belong to the control type with the piston motion of position signal feedback control.The hydraulic impactor of this position feedback control form, piston motion when the certain position with regard to automatic reverse, in each shuttling movement, when system's fuel supply flow rate changes, cause the system works variation in pressure, make the stressed change of piston, the impact energy of piston output also changes.So this impactor can not guarantee that each impact energy size is constant.

The purpose of this utility model is that a kind of hydraulic impactor that moves for the feedback signal control piston with the oil pressure will be provided, and it is constant that it can realize exporting the impact energy size at every turn.

The purpose of this utility model is achieved in that with the parts of pressure signal control valve as the motion of pressure feedback signal control piston, is equipped with commutation cone valve and piston/cylinder structure, makes system works pressure reach certain value; After accumulator had been enough accumulation of energys, piston just began stroke movement.Because the pilot pressure of pressure signal control valve is constant, pressure was identical when each stroke of piston began, thereby guaranteed that each piston impact can be identical.

The utility model is realized stable output impact energy owing to adopt the motion of pressure feedback control mode control piston, has avoided existing hydraulic impactor when flow system flow reduces, and system pressure descends, the stressed minimizing of piston and phenomenon that the output impact energy is descended; Simultaneously, owing to can make impact energy not be subjected to the influence of changes in flow rate, so can change frequency of impact by changing flow; The utility model adopts and has hydraulic impactor oil cylinder inequality now, and commutation cone valve structure, oil cylinder inner wall have been removed the stroke feedback oilhole and the backhaul feedback oilhole of existing oil cylinder from, have simplified housing structure, have reduced leak path, sealability in improving.

Concrete structure of the present utility model provides by the following examples and accompanying drawing thereof.

Fig. 1 is the pressure feedback formula hydraulic impactor principle assumption diagram that the utility model proposes; Fig. 2 is the structural representation of pressure signal control valve.

Describe in detail according to concrete structure and the implementation procedure that the utility model proposes below in conjunction with Fig. 1.Pressure feedback formula hydraulic impactor is made up of four parts.The piston/cylinder parts are made of piston (1), cylinder body (2), one-way valve (3); Commutation cone valve parts are made of poppet spool valve (4), valve body (6), spring (4); Pressure signal control valve parts are made of one-way valve (7), spool (9), spring (10), damping orifice (8) and relief valve (12); The accumulator parts are made of bladder accumulator (11).The arrow circuit that makes progress is system's fuel feeding in-line, and arrow is downwards an oil circuit.Piston is in stroke and finishes backhaul setting in motion state among the figure.When system gave this impactor fuel feeding, ante-chamber (a) oil-feed promoted piston (1) and makes drawback movement backward, and back cavity (b) inner fluid is through hydraulic fluid port (c) commutation cone valve and oil circuit oil return.After piston moved backward and crosses oil duct (c), the back cavity oil return disconnected, and oil pressure raises in the chamber, and fluid flows into ante-chamber through one-way valve (3), and be subjected to resultant direction forward before and after the piston this moment; Piston is done retarded motion under effect of inertia, be zero up to speed.The chamber does not need system's fuel feeding back cavity also to system's oil extraction before and after this process piston, and system's fuel feeding and back cavity oil extraction are stored by accumulator (11), and system's charge oil pressure rises gradually.(Pk illustrates in the back) valve port (f) is open-minded when system's charge oil pressure is raised to the cracking pressure Pk of pressure signal control valve, fuel feeding enters the commutation cone valve through hydraulic fluid port (f), oil duct (e), promoting poppet valve core (5) moves to left, fluid enters oil cylinder back cavity (b) by oil duct (d), piston is subjected to resultant direction forward, begin to do that oil circuit is differential connection in the stroke accelerated motion stroke procedure, ante-chamber oil extraction, system's fuel feeding and accumulator oil storage are together to the back cavity fuel feeding, to satisfy the big flow of stroke of piston high-speed motion needs.Because piston is made the high speed stroke movement, consuming flow increases gradually, system works pressure is descended gradually, when pressure drops to the closing pressure PL of pressure signal control valve (PL illustrates in the back), valve port (f) is closed, the back cavity in-line disconnects, poppet valve core (5) resets under spring action, simultaneously the piston impact kinetic energy that will be had as high-speed motion by impact bar (13) discharges with the form of impact energy, the oil circuit of impactor is got back to the backhaul initial state again, impact energy is constantly exported in circulation and so forth.

Process and the principle that realizes pressure signal control is described below in conjunction with Fig. 2.The φ d periphery of pressure signal control valve spool (15) is the sealing strip of valve port (f), and this limit is divided into two with the spool right side and is subjected to the oil pressure area, i.e. φ D-φ d annulus area and φ D area.When valve port sealing, valve leads to pressure oil, and oil pressure is when being lower than the oil pressure relief of relief valve (17), hold the oil effect that all is stressed about spool, the right-hand member compression area is the annulus area of φ D-φ d, and the left end compression area is a spool φ D gross area, it is made a concerted effort is thrust to the right, and valve port is closed.When the overflow of inlet pressure rising relief valve, a part of pressure of the damping hole of flowing through (18) loss makes spool left and right sides pressure at two ends unequal, and left end pressure is set up by relief valve, and right-hand member pressure makes when system pressure P raises with system change

P> (SφD)/(SφD－φd) Pj＝Pk

In the formula: S φ D---spool gross area; S φ D-φ d---the annulus area of valve right-hand member φ D-φ d;

PJ---relief valve is set up oil pressure relief; PK---pressure signal control valve cracking pressure.

At this moment spool is subjected to resultant direction left, and spool moves to left, and valve port is opened, and oil circuit is connected.Valve port is opened the back valve core right-hand member and is subjected to the oil pressure area to become the area of φ D, because system's pressure this moment is greater than oil pressure relief, so the stable unlatching of spool (15).System pressure oil flows to the oil cylinder back cavity by the pressure signal control valve makes piston make stroke movement.

When piston is made high-speed motion, need a large amount of flows, system pressure is reduced, during system pressure P≤PL(PL=PJ), relief valve stops overflow, end oil pressure balance about spool, spool moves right under spring (16) effect, and close port disconnects oil circuit, and the stroke fuel feeding stops.One-way valve (14) is avoided the back cavity fluid influence of falling liquid spool working stability and is established.

Claims

1, a kind of pressure feedback formula hydraulic impactor, the valve that piston, accumulator and control oil channel commutation are arranged, it is characterized in that forming by piston/cylinder parts, commutation cone valve parts, pressure signal control valve parts and accumulator parts four parts, the import of pressure signal control valve communicates with in-line, pressure signal control valve internal check valve (7) communicates with commutation cone valve oil duct (e) behind the pressure signal control valve, the commutation cone valve links to each other with cylinder body (2), and two oil ducts on the commutation cone valve communicate with cylinder-body oil duct (c), (d) respectively.

2, the described pressure feedback formula of claim 1 hydraulic impactor is characterized in that having or not stroke feedback oil duct and backhaul feedback oil duct, and the piston/cylinder structure that has an one-way valve (3) that the cylinder body (2) and the piston (1) of the unidirectional connection of front/back cavity are formed.

3, the described pressure feedback formula of claim 1 hydraulic impactor, the commutation cone valve structure that it is characterized in that poppet valve core is arranged (5) and spring (4) formed.

4, the described pressure feedback formula of claim 1 hydraulic impactor, the pressure signal control valve that it is characterized in that one-way valve is arranged (7), spool (9), spring (10), damping hole (8) and relief valve (12) are formed.