Water filling valve of hydraulic press

Abstract

The utility model discloses a water filling valve of a hydraulic press, which comprises a valve body, a hydraulic cylinder, a connecting rod and a valve core, a side water gap is arranged on the side surface of the valve body, a bottom water gap is arranged at the bottom of the valve body, the hydraulic cylinder is arranged at the top of the valve body, a piston rod of the hydraulic cylinder is connected with the valve core through the connecting rod, and a ball head is arranged at the bottom of the connecting rod. A spherical groove is formed in the top of the valve element body, a ball head containing hole is formed in the bottom of the ball head cover, the ball head cover is fixedly installed on the top of the valve element body, the spherical groove and the ball head containing hole are in butt joint to form a ball head containing cavity, a longitudinal first limiting groove is formed in the ball head, a longitudinal second limiting groove is formed in the corresponding position of the ball head containing hole, and the ball head is arranged in the ball head containing cavity. The first limiting groove and the second limiting groove are in butt joint, and limiting balls are arranged in the two limiting grooves. The valve element is of a multi-step-shaped structure, high-pressure water flow can be effectively buffered, the water hammer phenomenon generated at the moment when the water valve is closed is reduced, and equipment on a pipeline is greatly protected.

Description

Technical Field

[0001] The utility model belongs to the field of steel pipe hydrostatic testing, and specifically relates to a water filling valve for a hydraulic press. Background Art

[0002] A hydrostatic testing machine is used to test various steel pipes such as cast iron pipes and steel pipes for phenomena such as leakage and deformation under specified pressure and within a specified time. It is a device that can meet or satisfy relevant technical standards. By filling low-pressure water and high-pressure water into the steel pipe in sequence to make the steel pipe bear a certain pressure, the pressure that the steel pipe can bear is tested, so as to obtain the pressure resistance ability of the steel pipe.

[0003] At present, the water filling valve device adopted on the hydrostatic testing machine can meet the process of filling low-pressure water into the steel pipe and sealing high-pressure water during the hydrostatic test. However, its assembly is complex and time-consuming, the later maintenance is difficult, and a large water hammer phenomenon will occur when the water filling valve is closed, which causes relatively serious damage to the equipment on the pipeline. Summary of the Utility Model

[0004] The utility model aims to solve the problems of complex assembly of the water filling valve and large water hammer damage to pipeline equipment when it is closed. For this purpose, a water filling valve for a hydraulic press is provided, which includes: a valve body, a hydraulic cylinder, a connecting rod, and a valve core. A side water port is arranged on the side of the valve body, and a bottom water port is arranged at the bottom of the valve body. The hydraulic cylinder is installed on the top of the valve body, and the piston rod of the hydraulic cylinder is connected to the valve core through the connecting rod. A ball head is arranged at the bottom of the connecting rod. The valve core includes a valve core body and a ball head cover. A spherical groove is opened at the top of the valve core body, and a ball head receiving hole is opened at the bottom of the ball head cover. The ball head cover is fixedly installed on the top of the valve core body. The spherical groove and the ball head receiving hole are butted to form a ball head receiving cavity. The ball head is provided with a longitudinal first limiting groove, and a longitudinal second limiting groove is opened at the corresponding position of the ball head receiving hole. The ball head is arranged in the ball head receiving cavity, and the first limiting groove and the second limiting groove are butted, and a limiting bead is arranged in the two limiting grooves. The bottom of the valve core body is an inclined multi-stage stepped structure, and its inclined structure starts from the side water port and gradually thickens inward along the axis of the side water port. A valve seat is arranged below the valve core body, and a multi-stage stepped structure corresponding to the valve core body is arranged on the upper part of the valve seat.

[0005] Further, a lower guide sleeve is arranged at the bottom water port. The middle of the lower guide sleeve is a through cylinder, and a ring-shaped disc with a plurality of water outlet holes is arranged around the bottom of the cylinder. The outer edge of the ring-shaped disc is welded to the bottom of the valve seat.

[0006] Further, a guide pipe is arranged between the lower guide sleeve and the valve core body. The upper part of the guide pipe is a disc, and a damping spring is sleeved outside the guide pipe. The bottom of the damping spring supports on the ring-shaped disc of the lower guide sleeve, and the upper part supports on the disc at the upper part of the guide pipe.

[0007] Further, the upper part of the guide pipe is a disc with an arched structure.

[0008] Further, the upper part of the valve body is sealed with a flange cover. A hole is opened in the center of the flange cover, and an upper guide sleeve is arranged in the hole at the center of the flange cover. The connecting rod extends into the valve body through the upper guide sleeve at the center of the flange cover.

[0009] Further, a connecting rod sleeve is arranged between the hydraulic cylinder and the valve body. The upper part of the connecting rod sleeve is connected to the front end cover of the hydraulic cylinder, and the lower part is connected to the flange cover. The connecting rod is accommodated inside the connecting rod sleeve.

[0010] Compared with the prior art, the following beneficial effects can be obtained: The water filling valve of this hydraulic press optimizes the structure and adds the design of a ball head connecting rod. Both ends of the ball head connecting rod are spherical contact surfaces, which reduces the requirements for straightness and concentricity from the hydraulic cylinder to the valve core, and reduces the requirements for machining accuracy and assembly accuracy. At the same time, multiple inclined sealing surfaces are designed, and multi-stage simultaneous sealing can be achieved during use. Even if there are slight errors in machining and assembly, it will not affect the sealing effect. If one of the seals is damaged, it will not affect the sealing effect of the valve core. Moreover, during the closing process, the water flow cross-section gradually shrinks along the inclined multi-stage seal. At the same time, a damping spring is added between the multi-stage sealed valve core and the multi-stage sealed valve seat, which can greatly reduce the occurrence of water hammer phenomena and greatly reduce the damage to the equipment on the pipeline. In addition, the valve body is designed to be split. During maintenance, only the flange cover needs to be disassembled from the top for maintenance operations, reducing the disassembly workload during maintenance. Description of the Drawings

[0011] Figure 1 is the overall structural schematic diagram of the present invention;

[0012] Figure 2 is the partial structural schematic diagram at A of the present invention;

[0013] Figure 3 is the front view structural diagram of the second limit groove of the present invention;

[0014] Figure 4 is the side view schematic diagram of the second limit groove of the present invention;

[0015] Figure 5 is the longitudinal deflection schematic diagram of the valve core of the present invention;

[0016] Figure 6 is the schematic diagram of the top structure of the guide pipe of the present invention Figure 1 ;

[0017] Figure 7 is the schematic diagram of the top structure of the guide pipe of the present invention Figure 2 。

[0018] Among them:

[0019] 1 - Valve body, 2 - Hydraulic cylinder, 3 - Connecting rod, 31 - Connecting rod sleeve, 4 - Ball head, 41 - Ball head cover, 42 - Ball head receiving hole, 43 - First limiting groove, 44 - Second limiting groove, 45 - Limiting bead, 5 - Valve core, 51 - Valve core body, 52 - Spherical groove, 6 - Valve seat, 7 - Lower guide sleeve, 8 - Flange cover, 81 - Upper guide sleeve, 9 - Damping spring, 10 - Guide tube, 11 - Side water port, 12 - Bottom water port. Detailed implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figure 1 shown, a water press water filling valve includes a valve body 1, a hydraulic cylinder 2, a connecting rod 3, and a valve core 5. The valve body 1 serves as the housing of the device. A side water port 11 is provided on the side of the valve body 1, and a bottom water port 12 is provided at the bottom. A flange cover 8 is hermetically installed on the upper part of the valve body 1. A through hole is opened in the central part of the flange cover 8, and an upper guide sleeve 81 is installed in the through hole. A hydraulic cylinder 2 is provided on the upper part of the flange cover 8. A connecting rod sleeve 31 is connected and installed between the front end cover of the hydraulic cylinder 2 and the guide sleeve 81.

[0022] The upper end of the connecting rod 3 is connected to the end of the piston rod of the hydraulic cylinder 2 and passes through the connecting rod sleeve 31 and the upper guide sleeve 81. A ball head 4 is provided at the bottom of the connecting rod 3, and longitudinal first limiting grooves 43 are provided on both sides of the ball head 4.

[0023] As Figures 2 to 5 shown, the valve core 5 includes a valve core body 51 and a ball head cover 41. A spherical groove 52 is opened at the top of the valve core body 51. The ball head cover 41 is provided with a ball head receiving hole 42. The ball head 4 is placed in the spherical groove at the top of the valve core 5, and the ball head 4 is fixed in the ball head receiving cavity formed by the spherical groove 52 and the ball head receiving hole 42 through the ball head cover 41. A longitudinal second limiting groove 44 is provided in the ball head receiving hole 42. The second limiting groove 44 is docked with the first limiting groove 43, and a limiting bead 45 is provided in the two limiting grooves. The limiting bead 45 is arranged in the second limiting groove 44 and the first limiting groove 43 that are docked with each other, so that the ball head 4 cannot rotate in the horizontal direction and can only rotate within a very small angle in the longitudinal direction.

[0024] The bottom of the valve core body 51 is an inclined multi-step structure. Its inclined structure starts from the side water port 11 and gradually thickens inward along the axis of the side water port 11. A valve seat 6 is provided below the valve core body 51, and a multi-step structure corresponding to the valve core body 51 is provided on the upper part of the valve seat 6.

[0025] As Figure 1 and Figure 6 、 Figure 7 shown, a lower guide sleeve 7 is provided at the water inlet 12 at the bottom of the valve body 1. The middle of the lower guide sleeve 7 is a through cylindrical structure. A ring-shaped disc with a number of water outlet holes is arranged around the bottom of the cylindrical structure. The outer edge of the ring-shaped disc is welded to the bottom of the valve seat 6. A guide pipe 10 is arranged between the lower guide sleeve 7 and the valve core body 51. The upper part of the guide pipe 10 is a disc. A damping spring 9 is sleeved outside the guide pipe 10. The bottom of the damping spring 9 supports on the upper end surface of the cylindrical structure of the lower guide sleeve 7, and the upper part supports on the disc at the upper part of the guide pipe 10. The damping spring 9 always pushes the guide pipe 10 to press the valve core 5, so that the valve core 5 is always restricted in the up and down directions, ensuring stability during the water filling and discharging process.

[0026] The top of the upper disc of the guide pipe 10 can be set as an arched structure. When the top of the upper disc of the guide pipe is an arched structure, the corresponding contact surface at the bottom of the valve core body 51 is also an arched structure, further ensuring the balanced force of the valve core 5 and further preventing rotation.

[0027] When in use, when the low-pressure water fills the valve body 1, at this time, the hydraulic cylinder 2 pushes the valve core body 51 to be sealed with the valve seat through the connecting rod 3. At this time, the guide pipe 10 at the bottom of the valve core body 51 moves downward through the lower guide sleeve 7 at the bottom of the valve seat 52 to seal the low-pressure water. Then, the piston rod of the hydraulic cylinder 2 fully extends, completely closing the valve core body 51 and the valve seat. At this time, it is in a completely sealed state. Immediately afterwards, the high-pressure equipment pressurizes from the other side of the pipe fitting to the rated water pressure. After the water pressure test is completed, the piston rod of the hydraulic cylinder 2 retracts to complete the discharge of the water pressure load. The damping spring 9 can reduce the problem of uncontrollable closing speed when the water filling valve is closed, and the inclined stepped structure can effectively buffer the high-pressure water flow, reduce the water hammer phenomenon generated at the moment when the water valve is closed, and greatly protect the equipment on the pipeline.

Claims

1. A water press water filling valve, comprising a valve body (1), a hydraulic cylinder (2), a connecting rod (3), and a valve core (5). A side water port (11) is arranged on the side of the valve body (1), and a bottom water port (12) is arranged at the bottom of the valve body (1). The hydraulic cylinder (2) is installed on the top of the valve body (1), and the piston rod of the hydraulic cylinder (2) is connected to the valve core (5) through the connecting rod (3). It is characterized in that: A ball head (4) is provided at the bottom of the connecting rod (3). The valve core (5) includes a valve core body (51) and a ball head cover (41). A spherical groove (52) is formed at the top of the valve core body (51). A ball head receiving hole (42) is formed at the bottom of the ball head cover (41). The ball head cover (41) is fixedly installed at the top of the valve core body (51). The spherical groove (52) and the ball head receiving hole (42) are butted to form a ball head receiving cavity. A longitudinal first limiting groove (43) is formed in the ball head (4). A longitudinal second limiting groove (44) is formed at the corresponding position of the ball head receiving hole (42). The ball head (4) is arranged in the ball head receiving cavity. The first limiting groove (43) and the second limiting groove (44) are butted, and a limiting bead (45) is arranged in the two limiting grooves. The bottom of the valve core body (51) is an inclined multi-step structure, and its inclined structure starts from the side water inlet (11) and gradually thickens towards the inside along the axis of the side water inlet (11). A valve seat (6) is arranged below the valve core body (51), and a multi-step structure corresponding to the valve core body (51) is arranged on the upper part of the valve seat (6).

2. The water filling valve of a hydraulic press according to claim 1, characterized in that, A lower guide sleeve (7) is arranged at the bottom water inlet (12). The middle of the lower guide sleeve (7) is a through cylinder. A ring-shaped disc with a plurality of water outlet holes is arranged around the bottom of the cylinder, and the outer edge of the ring-shaped disc is welded to the bottom of the valve seat (6).

3. The water filling valve of a hydraulic press according to claim 2, characterized in that, A guide pipe (10) is arranged between the lower guide sleeve (7) and the valve core body (51). The upper part of the guide pipe (10) is a disc. A damping spring (9) is sleeved outside the guide pipe (10). The bottom of the damping spring (9) is supported on the ring-shaped disc of the lower guide sleeve (7), and the upper part is supported on the disc at the upper part of the guide pipe (10).

4. The water filling valve of a hydraulic press according to claim 3, characterized in that, The upper part of the guide pipe (10) is a disc with an arched structure.

5. A water press water filling valve according to any one of claims 1-4, characterized in that, The upper part of the valve body (1) is sealed by a flange cover (8). A hole is formed in the center of the flange cover (8). An upper guide sleeve (81) is arranged in the hole in the center of the flange cover (8). The connecting rod penetrates into the valve body through the upper guide sleeve (81) in the center of the flange cover (8).

6. The water filling valve of a hydraulic press according to claim 5, characterized in that, A connecting rod sleeve (31) is arranged between the hydraulic cylinder (2) and the valve body (1). The upper part of the connecting rod sleeve (31) is connected to the front end cover of the hydraulic cylinder (2), and the lower part is connected to the flange cover (8). The connecting rod is accommodated inside the connecting rod sleeve (31).

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