CN2345797Y

CN2345797Y - High and low pressure switching device for concrete transportation pump

Info

Publication number: CN2345797Y
Application number: CN 98230983
Authority: CN
Inventors: 易晓刚; 吴冬香; 贺正南; 张允中
Original assignee: Sanyi Heavy Industry Group Co ltd
Current assignee: Sany Heavy Industry Co Ltd
Priority date: 1998-06-29
Filing date: 1998-06-29
Publication date: 1999-10-27
Anticipated expiration: 2008-06-29

Abstract

The utility model belongs to the technical field of fluid pressure converters, which relates to a high-low pressure switching device for concrete conveying pumps. The high-low pressure switching device comprises a valve body and a valve cover. The valve body is connected to communicate with a master oil cylinder; the valve cover is arranged on the valve body. The working panel of the valve body is provided with two rows of holes for switching the pressure of the master oil cylinder, and each row is provided with three holes which are symmetrically distributed on the valve body. The inner face of the valve cover is provided with two rows of holes which are corresponding to the two rows of holes arranged on the valve body, and the hole bottom of the front two holes of each row is communicated; the hole bottom of the other two holes of the two rows of holes is communicated. The valve cover is provided with two different positions (0 DEG position and the position after rotating 180 DEG) to be fixed on the valve body. The utility model has simple structure, and the utility model is easy to do high-low pressure switching operation with low failure rate and small pressure loss.

Description

The concrete pump high-low voltage switching device

The utility model belongs to hydrodynamic pressure converter technology field, relates to a kind of concrete pump high-low voltage switching device.

Available coagulation soil transfer pump high-low voltage switching device be with valve body that the master cylinder afterbody of concrete pump is connected on be furnished with two rounds, every round has three holes, on valve body surface, form three pairs of six holes, a hole on every row is communicated with to come delivery hydraulic pressure with oil pipe with a hole on another round, utilize master cylinder front/back cavity piston action power area not wait this factor, be connected to another hole by oil pipe is exchanged, thereby realize that high low pressure switches.The structure that this mode that oil pipe is connected to different holes is carried out the high low pressure conversion has following defective: 1, pipeline is long, joint is many, the pressure loss is big; 2, leakage point is many, causes that the probability of fault is big; 3, cost height; 4, handover operation more complicated.

The purpose of this utility model is that a kind of simple in structure, processing ease, rate of fault is low, cost is low concrete pump high-low voltage switching device will be provided.

The purpose of this utility model realizes with the following methods.This concrete pump high-low voltage switching device comprises and is connected the valve body that communicates, the valve gap on valve body with the master cylinder rear end cover, the hole that has two rows to switch master cylinder pressure on the working panel of valve body, three holes of every row, be symmetrically distributed on the valve body, on the inner face of valve gap be communicated with at the bottom of also there is the hole in preceding two holes of two rounds, every round the corresponding section of two rounds of valve body, be communicated with at the bottom of the hole in addition two holes of two rounds, valve gap can have two diverse locations (0 ° of position and Rotate 180 ° after position) to be fixed on the valve body.Below in conjunction with embodiment's accompanying drawing, the utility model is described in further detail.

Fig. 1 is the master cylinder of concrete pump and the schematic representation that the utility model links together;

Fig. 2 is the plan view of valve body of the present utility model (7);

Fig. 3 is the plan view of Fig. 2;

Fig. 4 is the left side view of Fig. 2;

Fig. 5 is the rear view of Fig. 2;

Fig. 6 is the inner face plan view of valve gap of the present utility model (8);

Fig. 7 is the A-A sectional view of Fig. 6;

Fig. 8 is the B-B sectional view of Fig. 6;

Working state figure when Fig. 9 is in the pumping of high pressure float amount for the utility model;

Working state figure when Figure 10 send for the utility model is in the low pressure large discharge pump;

Figure 11 is the utility model operating on low voltage schematic diagram;

Figure 12 is the utility model high-pressure work schematic diagram.

Among the figure:

1,2,3,4,5,6-hole 7-valve body 8-valve gap

9-screw 10-

screw

11,12,13,14,15,16-hole

17-working state display mark board 18-working panel A, B-master cylinder

P-input oil pipe T-output oil pipe

The utility model is installed on the afterbody of master cylinder (A, B), can be observed working state display mark board (17) in one side away from master cylinder, " pumping " two words are arranged on valve body (7), on valve gap (8), one side has " high pressure " two words, and there are " low pressure " two words at its back side, therefore, valve body, valve gap are combined, and make sign board show " high pressure pumping " (as shown in Figure 9) or " low pressure pumping " (as shown in figure 10).High pressure oil enters hole (2) through input oil pipe (P) from the valve body left surface (to please refer to Figure 12) during the high-pressure work state, flow into the hole (12) of valve gap by hole (2), flow out the hole (1) of valve gap by hole (11) again to valve body, enter the rodless cavity of master cylinder (B) then, the promotion piston upwards, make the oil of rod chamber flow out the hole (6) that enters valve body (7) through oil pipe, enter the hole (16) of valve gap (8) by hole (6), passage in valve gap flows to hole (13) and flows out the hole (3) of valve gap in the valve body, flow out the rod chamber of valve body by hole (3) to master cylinder (A), the promotion piston is downward, the oil of the rodless cavity of A oil cylinder flows into the hole (4) of valve body, flow into the hole (14) of valve gap (8) again by hole (4), again by the hole (5) in hole (15) the inflow valve body that is communicated with hole (14), flow out to oil outlet tube (T) inlet from the valve body right flank at last, the pressure of output is higher than the pressure of oil inlet pipe.

When needs transfer the high pressure pumping to the low pressure pumping; shutdown operation switches: only need 12 screws (9) on the valve gap (8) are taken out; then valve gap is extracted Rotate 180 ° (attention seal ring); valve gap (8) is marked with " low pressure " side aligns, cooperate for " low pressure pumping " tightens screw (9) to get final product with the valve body outside " pumping " sign.Therefore the conversion between the high and low pressure is very convenient.

During operating on low voltage (with reference to Figure 11), pressure oil enters the hole (2) in valve body left side through oil inlet pipe (P), and enter into the hole (15) of valve gap (8) by upper surface, come out to enter again hole (3) in the valve body by the hole that is communicated with it (14) again, go out by the valve body underflow, enter the rod chamber of master cylinder (A), make piston downward, in the hole (13) on hole (4) the inflow valve gap of the oil of A cylinder rodless cavity on valve body, flow in the hole (1) on the valve body by the hole that is communicated with it (16) again, enter the rodless cavity of master cylinder (B), promote piston upwards, the oil of the rod chamber of master cylinder (B) enters hole (11) on the valve gap (8) to the hole (12) through hole on the valve body (6), flow into the hole (5) on the valve body again, flow out to output oil pipe (T) by the valve body right side at last, like this, the oil pressure of output oil pipe (T) is lower than the pressure of input oil pipe (P).

The utility model is simple in structure, and the high low pressure handover operation is easy, and fast, rate of fault is low during use, and the pressure loss is little.

Claims

1, a kind of concrete pump high-low voltage switching device, comprise and master cylinder (A, B) rear end cover connects the valve body (7) that communicates, valve gap on valve body (8), the hole (1 that has two rows to switch master cylinder pressure on the working panel (18) of valve body (7), 2,3,4,5,6), three holes of every row, be symmetrically distributed on the valve body, it is characterized in that on the inner face of valve gap (8) with two rounds (1 of valve body (7), 2,3,4,5,6) also there are two rounds (11 corresponding section, 12,13,14,15,16), preceding two holes (11 and 12 of every round, 14 and 15) be communicated with at the bottom of the hole, two holes (13 in addition of two rounds, 16) be communicated with at the bottom of the hole, valve gap (8) can have two diverse locations (0 ° of position and Rotate 180 ° after position) to be fixed on the valve body (7).