Summary of the invention
Technical problem to be solved by this invention is to provide a kind of to flow to the unidirectional hydraulic axial variable displacement plunger pump that moves with realization variable piston at above-mentioned prior art present situation by four-way electromagnetic reversing valve control oil, is particularly suitable for being applied in the glass fibre reinforced plastics hydraulic press system.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: a kind of unidirectional hydraulic axial variable displacement plunger pump, and comprise the plunger pump main body and be located at the stroking mechanism of this plunger pump main body one side, it is characterized in that described stroking mechanism comprises again
First flange is located at the pump housing first flange of described plunger pump main body and is installed on the end face;
Second flange is located at second flange of the pump housing of described plunger pump main body and is installed on the end face;
Variable piston, two ends are connected with second flange seal with aforesaid first flange respectively and form first oil pocket and second oil pocket respectively, and the bottom is connected with variable dish in the aforementioned plunger pump main body;
Returnning spring, an end and the aforementioned first flange inner wall end face offset, and the other end and aforementioned variable piston step surface offset;
Transition plate is located at outside the pump housing of described plunger pump main body, has two oil outlets, and two oil outlets of this transition plate communicate with aforementioned first oil pocket and second oil pocket respectively; And
Solenoid directional control valve is arranged on the aforementioned transition plate, is used to control the flow direction of oil.
Sealed type is equipped with first adjusting screw on described first end face of flange, and the first adjusting screw inner end is positioned at described first oil pocket, and the outer end is connected with first adjusting nut; Sealed type is equipped with second adjusting screw on described second end face of flange, and the second adjusting screw inner end is positioned at described second oil pocket, and the outer end is connected with second adjusting nut.Realize adjusting two grades of discharge capacities of size with this structure, and can guarantee to be stabilized in a fixed value.
Further optimal design, described variable piston base also is provided with the variable slide block that acts on described variable dish.
Further optimal design, described solenoid directional control valve is the four-way valve with P mouth, A mouth, B mouth and T mouth, accordingly, has the P mouth, A mouth, B mouth and the T mouth that are connected conducting with described solenoid directional control valve on the described transition plate end face.
Described plunger pump main body can comprise
The pump housing;
Pump cover is assemblied on the aforementioned pump housing, and forms an airtight space with the pump housing;
The variable dish is located in the aforementioned pump housing;
The backhaul dish is located on the described variable dish;
Transmission shaft is installed in the aforementioned pump housing by the bearing rotary type;
Housing assembly is positioned at the aforementioned pump housing and connects and rotate with transmission shaft with aforementioned transmission shaft; And
Plunger piston slippery boots mechanism is arranged between aforementioned housing assembly and the backhaul dish.
Compared with prior art, the invention has the advantages that: adjust control oil by solenoid directional control valve and flow to satisfy the adjustment of plunger pump displacement size, control is simple, move corresponding soon, reliability is good, can fully satisfy glass fibre reinforced plastics hydraulic press action request; After being applied in the glass fibre reinforced plastics hydraulic press system, can cut down the consumption of energy discharge capacity control structure simplicity of designization greatly.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment: with reference to illustrated in figures 1 and 2, the unidirectional hydraulic axial variable displacement plunger pump in the present embodiment comprises the plunger pump main body and is located at the stroking mechanism of this plunger pump main body one side.
The plunger pump main body comprises the pump housing 3, pump cover 18, variable dish 6, backhaul dish 13, transmission shaft 10, housing assembly 15, plunger piston slippery boots mechanism 14, slide plate 7, oil distribution casing 16 and ball-joint 12 again.
Pump cover 18 is assemblied on the pump housing 3 and forms an airtight space with the pump housing 3, and variable dish 6 is located in the pump housing 3, is an angle of inclination with transmission shaft 10, and backhaul dish 13 is located on the slide plate 7, and slide plate 7 is fixed on the variable dish 6,
Transmission shaft 10 is installed in the pump housing 3 by the bearing rotary type, by the full rail end roller bearing 17 and the full rail end roller bearing 8 that inner ring is arranged of no inner ring, end cover 9 is located on the pump housing 3 and will be expired rail end roller bearing 8 and is pressed in the pump housing 3 particularly.
Housing assembly 15 is positioned at the pump housing 3 and rotates with transmission shaft 10 connections and with transmission shaft 10, particularly, and housing assembly 15 and transmission shaft splined.
Plunger piston slippery boots mechanism 14 is arranged at housing assembly 15 mounting points, is pressed in backhaul dish 13 and with plunger piston slippery boots mechanism 14 on 7 on the slide plate by butterfly spring 11 compression force in the ball-joint 12.Oil distribution casing 16 is assemblied in joining on the pasta of pump cover 18.
Stroking mechanism comprises first flange 21, second flange 23, variable piston 5, Returnning spring 22, transition plate 2 and solenoid directional control valve 1 again.
First flange 21 is located at the pump housing 3 first flanges of plunger pump main body and is installed on the end face, sealed type is equipped with the first adjusting screw 24a on first flange, 21 end faces, the first adjusting screw 24a inner end is positioned at the first oil pocket A, and the outer end is connected with the first top cover nut 20a and the first adjusting nut 19a.
Second flange 23 is located at second flange of the pump housing 3 of plunger pump main body and is installed on the end face, sealed type is equipped with the second adjusting screw 24b on second flange, 23 end faces, the second adjusting screw 24b inner end is positioned at the second oil pocket B, and the outer end is connected with the second top cover nut 20b and the second adjusting nut 19b.
Variable piston 5 two ends are tightly connected with first flange 21 and second flange 23 respectively and form the first oil pocket A and the second oil pocket B respectively, and the bottom is connected with variable dish 6 in the plunger pump main body, and variable piston 5 bottoms also are provided with the variable slide block 4 that acts on variable dish 6.
Returnning spring 22 1 ends and first flange, 21 inwall end faces offset, and the other end and variable piston 5 step surfaces offset, and transition plate 2 is located at the pump housing 3 outsides of plunger pump main body, and two oil outlets of this transition plate 2 communicate with the first oil pocket A and the second oil pocket B respectively.
Four-way electromagnetic reversing valve 1 has P mouth, T mouth, A mouth and B mouth, be arranged on the transition plate 2, and the P mouth of this solenoid directional control valve 1, T mouth, A mouth and B mouth P mouth, T mouth, A mouth and the B mouth of corresponding transition plate 2 respectively is provided with.
Working principle: the transmission shaft 10 of plunger pump is rotated by driven by motor, transmission shaft 10 connects with housing assembly 15 usefulness involute spliness, drive housing assembly 15 rotations, drive of the center line rotation of a plurality of plunger piston slippery boots mechanism 14 around transmission shaft 10, plunger piston slippery boots mechanism 14 is pressed on the variable dish 6 that becomes certain angle of inclination with axis by belleville spring 11 compression force in the ball-joint 12 in backhaul dish 13, at this moment, a plurality of plunger piston slippery boots mechanism 14 makes axially reciprocating simultaneously in housing assembly 15, finish oil suction and press the do action of oil. realize the plunger pump displacement variation by the angle of inclination of adjusting variable dish 6.
The working principle of stroking mechanism is: external control oil is connected the filler opening of cab apron 2, adjusts control oil by solenoid directional control valve 1 and flows to, when solenoid directional control valve 1 must not electricity, control oil enters the second oil pocket B, promote variable piston 5 action left, make variable dish 6 angles of inclination diminish, pump displacement diminishes; When solenoid directional control valve 1 when electric, control oil enters the first oil pocket B, promotes variable piston 5 action to the right, makes variable dish 6 angles of inclination become big, it is big that pump displacement becomes.
Come control pump output discharge capacity by solenoid directional control valve 1, action response is fast, and the reliability height fully satisfies glass fibre reinforced plastics hydraulic press action request.In addition can be by regulating the first adjusting screw 24a and the second adjusting screw 24b at two end flange places, it is big to adjust oil pump, little two grades of discharge capacities, mechanical position limitation can guarantee greatly, little two grades of discharge capacities are stabilized in a fixed value, guarantee axial plunger POF constancy, when being applied in the glass fibre reinforced plastics hydraulic system, can realize that the action of glass fibre reinforced plastics hydraulic press is stable, operating rate is steady.