High-pressure exhaust valve of pneumatic hydraulic press

Abstract

The utility model relates to the field of hydraulic testing machines in the metal casting technology, in particular to a high-pressure exhaust valve of a pneumatic hydraulic press, which comprises a frame, a valve body and a driving piece are fixedly connected to the end face of the frame, a cavity and a medium channel communicated with the cavity are arranged in the valve body, and a piston rod is fixedly connected to the output end of the driving piece. The piston rod is arranged in the cavity, and a blocking structure used for closing the medium channel is further arranged between the piston rod and the cavity. A protection assembly is arranged at the exhaust end of the valve body, under the condition that high-pressure water is pumped into the valve body, the piston rod can be easily pulled up through the air cylinder for unloading, the normal pressure maintaining time of the hydraulic pressure testing machine is about 10-15 S, pressure maintaining can be conducted for 2 hours for a special test, the good pressure maintaining effect can be achieved, and the hydraulic pressure testing machine is simple in structure and convenient to use. And through the arrangement of the protection assembly, the service life of the plugging structure can be effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal casting technology water pressure testing machine field especially, it relates to a kind of pneumatic hydraulic press high-pressure exhaust valve. BACKGROUND

[0002] In the hydrostatic test of nodular cast iron pipe, the exhaust valve is an important component, which functions to remove air in the pipe during water filling to ensure that the pipe is filled with water rather than a mixture containing air bubbles.

[0003] By the way that cylinder drives floating ball to close exhaust cavity, the effect of exhaust sealing is achieved, such as the prior art Chinese patent publication number "CN217519338U" discloses a cylinder type waterproof hammer exhaust valve, comprising a valve body, a floating ball structure, a large valve disc, a small valve disc, a valve rod, a diaphragm structure, a vacuum breaking valve and a flow limiting exhaust pipe, the valve body is provided with an upper cavity, an exhaust cavity and a lower cavity, the floating ball structure is arranged in the lower cavity, the diaphragm structure is arranged in the upper cavity, which divides the upper cavity into an upper chamber and a lower chamber, the valve rod is arranged in the valve body, the upper part of the valve rod is connected with the diaphragm structure, the large valve disc and the small valve disc are arranged on the valve rod and located in the lower cavity. The utility model realizes continuous exhaust by setting small exhaust gap and large exhaust gap, and solves the defect of excessive exhaust speed when the pressure in the pipe is too high through the cooperation of the two, avoiding pipe oscillation; meanwhile, multiple exhaust channel paths are arranged, and the exhaust channel can change according to the pressure of the water conveying pipe, so that the exhaust speed is maintained constant, ensuring good exhaust effect.

[0004] In specific operation, the exhaust valve usually needs to inhale air from the outside after exhaust, and if the inhaled air from the outside cannot be filtered directly into the valve body, the floating objects and fine particles contained in the air can easily cause wear to the sealing structure and accelerate the damage speed, which has poor practicability. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above-mentioned shortcomings in the prior art that the inhaled air from the outside cannot be filtered, and proposes a pneumatic hydraulic press high-pressure exhaust valve.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] A pneumatic hydraulic press high-pressure exhaust valve is designed, which comprises a frame, a valve body and a driving member fixedly connected to the end face of the frame, a cavity provided in the valve body, a medium channel communicating with the cavity, an output end of the driving member fixedly connected with a piston rod, the piston rod being arranged in the cavity, and a plugging structure for closing the medium channel being further arranged between the piston rod and the cavity;

[0008] The valve body is provided with a protection assembly at the exhaust end, and the protection assembly is used for filtering floating objects in the inhaled air.

[0009] Further, the plugging structure comprises a plunger and a ball head, the medium channel is communicated with the side edge and the bottom edge of the valve body to form an air outlet and an exhaust outlet respectively, the plunger is fixedly connected to the inner bottom of the valve body, and the center point of the plunger is further provided with a gas guide hole communicated with the exhaust outlet.

[0010] Further, the ball head is fixedly connected to the free end of the piston rod, and the ball head face of the ball head can abut against the gas guide hole.

[0011] Further, the protection assembly comprises a connecting piece fixedly connected to one end of the valve body at the exhaust outlet, the connecting piece is provided with a through hole coaxial with the exhaust outlet, and the side surface of the connecting piece extends inward at the through hole to form a recess, and the recess is fixedly connected with a filter cover through an elastic structure.

[0012] Further, the top of the filter cover is axially distributed with a plurality of filter grooves, and the inside of the filter cover is fixedly connected with a filter screen for closing the filter grooves, and the bottom of the filter cover extends outward to form an extension part, and the extension part is clamped in the recess.

[0013] Further, the elastic structure comprises elastic columns, at least two elastic columns are fixedly connected in the recess, the end of the elastic column is provided with a protruding part, and the top of the elastic column extends downward along the center to form a deformation groove, the extension part is provided with a clamping hole, and the elastic column is clamped with the extension part through the clamping hole.

[0014] The pneumatic water pressure machine high-pressure exhaust valve has the advantages that: the piston rod head is made into a ball head, the material of the plunger is Teflon, the driving pressure of the cylinder is much smaller than that of the oil cylinder, and the plunger will not be damaged, the sealing effect of the ball head is better than that of the traditional conical surface; the outer diameter of the ball head is 60mm, the outer diameter of the piston rod is 35mm, and the hole diameter of the exhaust outlet is 30mm, the size of the hole diameter is smaller than the diameter of the piston rod, in the case that high-pressure water is injected into the valve body, the piston rod can be easily pulled up by the cylinder to unload, the normal pressure maintaining time of the water pressure testing machine is about 10-15S, the pressure can be maintained for 2 hours for special tests, good pressure maintaining effect can be achieved, and the service life of the plugging structure can be effectively prolonged through the arrangement of the protection assembly. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model;

[0016] Figure 2 It is a structural schematic view of the protection assembly of the utility model;

[0017] Figure 3 For Figure 2 A zone amplification structure schematic diagram.

[0018] In the figure: 1, frame; 2, valve body; 21, cavity; 22, medium channel; 3, driving part; 31, piston rod; 4, plugging structure; 41, plunger; 411, air guide hole; 42, ball head; 5, protection assembly; 51, connecting piece; 511, through hole; 512, recess; 52, filter cover; 521, filter groove; 522, extension; 523, clamping hole; 6, elastic structure; 61, elastic column; 62, deformation groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0020] Referring to Figures 1-3 A high-pressure exhaust valve of a pneumatic hydraulic press, comprising a frame 1, a valve body 2 and a driving part 3 are fixedly connected to the end face of the frame 1, a cavity 21 is arranged in the valve body 2, and a medium channel 22 communicating with the cavity 21 is arranged in the valve body 2, the output end of the driving part 3 is fixedly connected with a piston rod 31, the piston rod 31 is arranged in the cavity 21, and a plugging structure 4 for closing the medium channel 22 is further arranged between the piston rod 31 and the cavity 21.

[0021] Among them, the valve body 2 is provided with a protection assembly 5 at the exhaust end, and the protection assembly 5 is used for filtering floating objects in the inhaled air.

[0022] Further, the plugging structure 4 comprises a plunger 41 and a ball head 42, the medium channel 22 communicates with the side edge and the bottom edge of the valve body 2 to form an air outlet and an exhaust outlet respectively, the plunger 41 is fixedly connected to the inner bottom of the valve body 2, and the center point of the plunger 41 is further provided with an air guide hole 411 communicating with the exhaust outlet.

[0023] Further, the ball head 42 is fixedly connected to the free end of the piston rod 31, and the ball head face of the ball head 42 can abut against the air guide hole 411.

[0024] In the embodiment, the driving part 3 is a cylinder, and the output end of the cylinder is fixedly connected with the piston rod 31 through a connecting flange;

[0025] Among them, the plunger 41 is installed in the cavity, and the material is Teflon, which is combined with the piston rod 31 to seal; the air and water flow in the cavity 21, which is used for exhausting air and sealing high-pressure water; the piston rod 31 is made of stainless steel, and the ball head 42 is combined with the plunger 41 to seal high-pressure water.

[0026] In detail, the protection assembly 5 comprises a connecting piece 51 fixedly connected to one end of the valve body 2 located at the exhaust port, the connecting piece 51 is provided with a through hole 511 coaxial with the exhaust port, and a recess 512 is formed by extending inwardly at the side of the through hole 511, and the filter cover 52 is fixedly connected in the recess 512 through the elastic structure 6.

[0027] In general, the top of the filter cover 52 is axially distributed with a plurality of filter grooves 521, and a filter screen for closing the filter grooves 521 is fixedly connected inside, and an extension 522 is formed by extending outwardly at the bottom of the filter cover 52, and the extension 522 is clamped in the recess 512.

[0028] It should be noted that the connecting piece 51 is in a circular structure, a plurality of connecting holes are distributed at the peripheral circumference of the connecting piece 51, and the connecting piece 51 is fixedly connected with the valve body 2 through the connecting holes and locking bolts, and the side of the connecting piece 51 and the valve body 2 is provided with a sealing member to further improve the sealing performance.

[0029] Finally, the elastic structure 6 comprises elastic columns 61, at least two elastic columns 61 are fixedly connected in the recess 512, the end of the elastic column 61 is provided with a protruding portion, and the top thereof extends downwardly along the center to form a deformation groove 62, the extension 522 is provided with a clamping hole 523, and the elastic column 61 is clamped with the extension 522 through the clamping hole 523.

[0030] It is worth mentioning that the elastic column 61 is preferably made of materials such as rubber and plastic that have deformation ability, wherein the protruding portion is in a circular structure, the side of the protruding portion close to the filter cover 52 is provided with a guide slope, the elastic column 61 is guided and reduced in friction through the guide slope when passing through the clamping hole 523, and the protruding portion is in contact with the extension 522 after deformation and restoration of the deformation groove 62, thereby fixing the filter cover 52.

[0031] The above method can disassemble the filter cover 52, the filter cover 52 can be integrally replaced with the filter screen, and further, a water stop pad can be arranged between the extension 522 and the recess 512.

[0032] Working mode; when working, the driving member 3 drives the piston rod 31 to move, the piston rod 31 drives the ball head 42 to move, and when the gas in the cavity 21 is discharged, the ball head 42 is in contact with the gas guide hole 411 of the plunger 41, thereby playing a role of sealing and water stopping.

[0033] Similarly, after the ball head 42 is separated from the plunger 41, the external air is sucked into the cavity 21 and is transported through the medium channel 22, and after the external air enters the cavity 21, the external air is filtered through the filter screen first, and the floating objects and small particles contained in the external air are filtered through the filter screen;

[0034] When the filter screen needs to be replaced, the elastic column 61 is separated from the clamping hole 523 through the deformation slot 62 by pressing the convex part, so that the filter cover 52 can be disassembled, and the filter cover 52 can be integrally replaced with the filter screen.

[0035] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A high pressure exhaust valve for a pneumatic hydraulic press comprising a frame (1), characterized in that: The frame (1) is fixedly connected with a valve body (2) and a driving member (3) on the end face, the valve body (2) is provided with a cavity (21) and a medium channel (22) communicating with the cavity (21), the output end of the driving member (3) is fixedly connected with a piston rod (31), the piston rod (31) is arranged in the cavity (21), and a plugging structure (4) for closing the medium channel (22) is further arranged between the piston rod (31) and the cavity (21). The valve body (2) is provided with a protection assembly (5) at the exhaust end, and the protection assembly (5) is used for filtering floating objects in the inhaled air.

2. A high pressure exhaust valve for a pneumatic hydraulic press according to claim 1, characterized in that: The plugging structure (4) comprises a plunger (41) and a ball head (42), the medium channel (22) communicates with the side edge and the bottom edge of the valve body (2) to form an air outlet and an exhaust outlet, respectively, the plunger (41) is fixedly connected to the inner bottom of the valve body (2), and the midpoint of the plunger (41) is further provided with a gas guide hole (411) communicating with the exhaust outlet.

3. A high pressure exhaust valve for a pneumatic hydraulic press according to claim 2, characterized in that: The ball head (42) is fixedly connected to the free end of the piston rod (31), and the spherical head face of the ball head (42) can abut against the gas guide hole (411).

4. A high pressure exhaust valve for a pneumatic hydraulic press according to claim 1, characterized in that: The protection assembly (5) comprises a connecting piece (51), the connecting piece (51) is fixedly connected to one end of the valve body (2) at the exhaust outlet, the connecting piece (51) is provided with a through hole (511) coaxial with the exhaust outlet, and a recess (512) is formed by extending inwardly at the side surface of the connecting piece (51) at the through hole (511), and a filter cover (52) is fixedly connected in the recess (512) through an elastic structure (6).

5. A high pressure exhaust valve for a pneumatic hydraulic press according to claim 4, characterized in that: The filter cover (52) is axially provided with a plurality of filter grooves (521) at the top, and a filter screen for closing the filter grooves (521) is fixedly connected in the filter cover (52), an extension (522) is formed by extending outwardly at the bottom of the filter cover (52), and the extension (522) is clamped in the recess (512).

6. A high pressure exhaust valve for a pneumatic hydraulic press according to claim 5, characterized in that: The elastic structure (6) comprises an elastic column (61), at least two elastic columns (61) are fixedly connected in the recess (512), the end portion of the elastic column (61) is provided with a protruding portion, the top portion of the elastic column (61) extends downwardly along the center to form a deformation groove (62), the extension (522) is provided with a clamping hole (523), and the elastic column (61) is clamped with the extension (522) through the clamping hole (523).

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