CN200940709Y

CN200940709Y - High and low pressure switch valve for concrete transport pump

Info

Publication number: CN200940709Y
Application number: CN 200620080035
Authority: CN
Inventors: 支开印; 吉孟福; 董立队
Original assignee: Shandong Lingong Construction Machinery Co Ltd
Current assignee: Shandong Lingong Construction Machinery Co Ltd
Priority date: 2006-01-13
Filing date: 2006-01-13
Publication date: 2007-08-29
Anticipated expiration: 2016-01-13

Abstract

The utility model discloses a concrete delivery pump high and low pressure exchange valve, which comprises a valve core and a valve body. The utility model is characterized in that the conical inner cavity of the valve body is uniformly distributed with six axial long grooves with U typed cross section, the long grooves are connected with the six oil outlets around the valve body, the surface of the conical valve core is uniformly distributed with three spiral grooves; the valve core is assembled in the valve body. The utility model is small sized and simple structured, and has low producing cost, a short working oil flow distance, a small pressure lost, and a long service life, the utility model is convenient to operate, a high and low pressure exchange is completed by the turning of the valve core towards the valve body for 60 deg. The utility model is an ideal concrete delivery pump high and low pressure exchange valve.

Description

Concrete pump high low pressure switching valve

Technical field the utility model belongs to technical field of concrete pumps, relates to a kind of concrete pump high low pressure switching valve.

The concrete pump high-low voltage switching device of background technique prior art has three kinds of forms usually.A kind of is the rear end lid mounted device valve piece that connects at the master cylinder afterbody of concrete pump, by the exchange oil circuit, realizes that high low pressure switches; Second kind is two high-low voltage switching devices that spool constitutes by two valve bodies and symmetry, and the rotation of two spools by symmetry forms different oil ducts two loculuses or two big chambeies of master cylinder are connected in two valve bodies, realize that high low pressure switches; The high-low voltage switching device that the third is made up of the valve body and the truncated cone shape spool of a truncated cone shape cavity, oil inlet and outlet axis on the valve body is all in a plane, two L shaped grooves and a U-groove bevel are arranged on the spool, rotational valve core 180 degree, the difference that realizes oil duct connects, and switches thereby carry out high low pressure.Though more than three kinds of modes can both realize that high low pressure switches, and all exists defective: first kind of form, during switching that hydraulic fluid port is exposed, be easy to make hydraulic oil to pollute, the oil that overflows is difficult for reclaiming, and causes waste and environmental pollution, waste time and energy again, also damage seals and is threaded; Second kind of form is two valve bodies and two spools, the fabricating cost height, working oil the detour of process more relatively, the big chamber of oil cylinder closing oil path when operating on low voltage, cooling difficulty, oily temperature rise is very fast, and is bigger to the influence of hydraulic system seal life; The third form, two L type grooves and a U type groove on the spool require the machining accuracy height, processing difficulties, six hydraulic fluid port axis on the valve body are all in same plane, because flow is very big during low pressure, in order to reduce the pressure loss as far as possible, reduce flow velocity and strengthen circulation area as much as possible, to reduce the generation of heat, six holes on the valve body must be done very greatly like this, the volume of valve body is also wanted corresponding increase, in addition, and during owing to the high pressure pumping, system pressure is quite high, conical surface spool produces bigger axial force, and during assembling, difficulty is adjusted in the gap.

The purpose that summary of the invention the utility model is provides that a kind of volume is little, simple in structure, fabricating cost is low, the working oil flow process is short, the pressure loss is little, long service life, simple to operate, concrete pump high low pressure switching valve efficiently, to overcome the deficiencies in the prior art.

For achieving the above object, the utility model concrete pump high low pressure switching valve, it comprises a spool and valve body, it is characterized by: uniform six axial elongated slots that the cross section is the U type on the cylindrical cavity of valve body; Elongated slot communicates with six hydraulic fluid ports around the valve body respectively; The cylinder valve core outer surface uniform three spiral chutes; Valve core housing is contained in the valve body.

The utility model volume is little, simple in structure, fabricating cost is low, the working oil flow process is short, the pressure loss is little, long service life, simple and quick, and is every with relative valve body revolution 60 degree of spool, just can realize that a high low pressure switches.It is a kind of comparatively desirable concrete pump high low pressure switching valve.

Description of drawings Fig. 1 is the valve core structure schematic front view;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the valve body structure diagrammatic top view;

Fig. 4 is that the C of Fig. 3 is to view;

Fig. 5 is the B-B sectional view of Fig. 3;

Fig. 6, Fig. 7, Fig. 8, Fig. 9 are the utility model working principle schematic representation.

Embodiment is according to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, it comprises a spool 8 the utility model, a valve body 9, uniform six axial elongated slots 6 that the cross section is the U type on the cylindrical cavity of valve body 9, communicate with six hydraulic fluid ports 7 around the valve body respectively, cylindrical spool 8 outer surfaces uniform three spiral chutes 5, add man-hour, groove 6 on the valve body 9 can cast out in advance, but groove 5 spirals on the spool 8 mill out (also can cast out in advance), under the requirement of satisfying intensity, for reducing valve body 9 volumes, with two hydraulic fluid port axis misalignment on the same plane, simultaneously also be for corresponding with the groove 5 on the spool 8, reduce the pressure loss to greatest extent, valve body 9 inner chambers and spool 8 outer surface fine finishing do not need Sealing to seal, like this, as long as, just can realize that a high low pressure switches, and can correspondingly be provided with the steel ball and spring positioning device every 60 degree with spool 8 relative valve body 9 revolutions 60 degree.

Working principle of the present utility model is as Fig. 6, Fig. 7, Fig. 8, shown in Figure 9.

Among Fig. 6 and Fig. 8, Fig. 7 is the Placement of state shown in Figure 6, P is that the spiral chute 5 that spool 8 is passed through in import is connected with the loculus 3 of master cylinder M, T is outlet, spiral chute 5 by spool 8 is connected with the loculus 4 of master cylinder N, the big chamber 2 of master cylinder M is connected with the big chamber 1 of master cylinder N by the spiral chute 5 of spool 8, realizes the big discharge capacity conveying of low pressure.

Fig. 9 is the Placement of state shown in Figure 8, P is that the spiral chute 5 that spool 8 is passed through in import is connected with the big chamber 2 of master cylinder M, T is outlet, spiral chute 5 by spool 8 is connected with the big chamber 1 of master cylinder N, the loculus 3 of master cylinder M is connected with the loculus 4 of master cylinder N by the spiral chute 5 of spool 8, realizes the conveying of high pressure float amount.

Claims

1, a kind of concrete pump high low pressure switching valve, it comprises a spool and valve body, it is characterized by: uniform six axial elongated slots that the cross section is the U type on the cylindrical cavity of valve body; Elongated slot communicates with six hydraulic fluid ports around the valve body respectively; The cylinder valve core outer surface uniform three spiral chutes; Valve core housing is contained in the valve body.