Pre-unloading valve core with locknut

Abstract

The utility model relates to the technical field of prefill valves, and discloses a pre-unloading valve core with a locknut, which comprises a valve rod and a main valve core disc, the end part of the valve rod is fixedly provided with an auxiliary valve core disc, one end of the main valve core disc is provided with a central hole, the other end of the main valve core disc is provided with a pressure relief cavity, the pressure relief cavity is internally provided with an internal thread hole, and the locknut is arranged in the internal thread hole. A rectangular annular groove is formed in the inner wall of the inner threaded hole, the valve rod is inserted into the center hole in a sliding mode, the auxiliary valve element disc is arranged in the pressure relief cavity, a pressure relief plug is installed in the inner threaded hole in a threaded mode, and a stop ring is arranged in the rectangular annular groove in a clamped mode. The pressure relief plug installed in the main valve element disc in a threaded mode is arranged in the main valve element disc, the stop ring installed at the end of the main valve element disc in a clamped mode is used for blocking the pressure relief plug, the stop ring is used for preventing the pressure relief plug from rotating in the threads of the main valve element disc, and meanwhile an anti-falling step face on the pressure relief plug enables the stop ring not to be extruded out under large thrust. Finally, it is guaranteed that the pressure relief plug cannot retreat from the main valve element disc, and the anti-loosening effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid filling valves, in particular to a pre-unloading valve core with a locking nut. Background Art

[0002] The filling valve is a hydraulically controlled one-way valve, which stops flow in one direction and allows free flow in the other direction. The pilot action is achieved by the control valve core supplied with pressure from the oil port using hydraulic pressure. The prior art bulletin number is CN206017305U, which discloses a high-pressure filling valve, including a valve seat, a main valve core, and a valve body. The upper end of the valve seat is the low-pressure side, and the lower end of the valve seat is the high-pressure side that cooperates with the oil cylinder; the valve seat is provided with an inner hole, and the upper end face of the valve seat is the valve body mounting surface, the top of the main valve core passes through the inner hole of the valve seat, and the valve body is buckled on the main valve core and fixed on the valve body mounting surface; a limited-stroke sleeve is sleeved on the main valve core, the limited-stroke sleeve is positioned on the valve seat, and the limited-stroke sleeve is used to limit the opening height of the main valve core. The high-pressure filling valve fills the shortage of pressure level of existing filling valves through its ingenious structural design. The high-pressure filling valve has compact structure, small size, low opening pressure, good self-priming performance, unobstructed flow channel design, small flow resistance, low control pressure, reliable reset and easy maintenance. The filling valve is directly installed on the hydraulic cylinder body between the bottom of the hydraulic cylinder and the pre-welded flange.

[0003] For large-diameter high-pressure pre-release filling valves, the valve core disk and the valve stem are assembled. The filling valve core is easily deformed under high pressure, and the interconnected parts loosen and fall off, resulting in functional failure. Fastening screws and thread glue are generally used between parts to prevent loosening. In a high-pressure and high-impact hydraulic environment, it is also easy to fail. Based on this, the valve core of the existing pre-release filling valve has the problem of easy loosening of the threaded connection, which needs further improvement. Utility Model Content

[0004] The utility model aims to provide a pre-unloading valve core with a locking nut to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pre-relief valve core with a locking nut, comprising a valve stem and a main valve core disk, an auxiliary valve core disk being fixedly arranged at the end of the valve stem, a center hole being opened at one end of the main valve core disk, a pressure relief chamber being opened at the other end of the main valve core disk, an internal threaded hole being opened inside the pressure relief chamber, a rectangular annular groove being opened on the inner wall of the internal threaded hole, the valve stem being slidably inserted in the center hole, the auxiliary valve core disk being arranged in the pressure relief chamber, and a pressure relief plug being installed on the internal thread of the internal threaded hole, a stop ring being clamped in the rectangular annular groove, and the pressure relief plug being prevented from rotating in the thread of the main valve core disk by the stop ring.

[0006] In some embodiments, the end of the pressure relief plug is provided with an anti-falling step surface, the step surface includes a step end face and a step outer circle, the step end face is tightly pressed against the end face of the stop ring, and the step outer circle is inserted into the inner hole of the stop ring. The anti-falling step surface on the pressure relief plug prevents the stop ring from being squeezed out under a large thrust.

[0007] In some embodiments, an opening is provided on the surface of the retaining ring, so that the retaining ring can be elastically compressed radially, thereby facilitating the installation and removal of the retaining ring.

[0008] In some embodiments, a plurality of connecting holes are provided on the surface of the main valve core disk, and the outlet ends of the connecting holes extend into the pressure relief chamber. The auxiliary valve core disk covers the outlet ends of the connecting holes. The end of the pressure relief plug is provided with pressure relief holes that penetrate left and right. The inner cavity of the pressure relief chamber is connected to the outside through the pressure relief holes, and threaded threads are provided in the pressure relief holes.

[0009] In some embodiments, an end of the valve stem away from the auxiliary valve core disk is provided with an external thread, and a curved annular groove is provided on the surface of the external thread.

[0010] Beneficial Effects

[0011] The utility model provides a pre-release valve core with a locking nut, which has the following beneficial effects:

[0012] 1. The pre-relief valve core with a locking nut is assembled by sliding a valve stem and a main valve core disk. A threaded pressure relief plug is arranged in the main valve core disk, and a stop ring is installed at the end of the pressure relief plug to block the pressure relief plug. The stop ring prevents the pressure relief plug from rotating in the thread of the main valve core disk. At the same time, the anti-falling step surface on the pressure relief plug prevents the stop ring from being squeezed out under a large thrust, thereby ultimately ensuring that the pressure relief plug cannot exit the main valve core disk, thereby achieving an anti-loosening effect.

[0013] 2. The pre-discharge valve core with anti-loosening nut, firstly, improves the reliability of parts connection and greatly reduces the reduction of service life of the pre-discharge type filling valve caused by thread loosening. Secondly, it provides structural technical support for the high-speed response of the filling valve. Thirdly, it has a simple structure and is easy to install, which is convenient for realizing intelligent automation of production and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front section structure of the utility model;

[0015] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0016] Figure 3 This is a schematic diagram of the separation of the main valve core disc and the pressure relief plug;

[0017] Figure 4This is a schematic diagram of the front view structure of the stop ring;

[0018] Figure 5 This is a schematic diagram of the assembly of the valve core and valve seat proposed by the utility model.

[0019] In the figure: 1 valve stem, 2 main valve core disk, 3 auxiliary valve core disk, 4 center hole, 5 pressure relief chamber, 6 rectangular annular groove, 7 pressure relief plug, 8 retaining ring, 9 step end surface, 10 step outer circle, 11 opening, 12 connecting hole, 13 pressure relief hole, 14 arc surface annular groove, 15 valve seat. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 The utility model provides a technical solution: a pre-relief valve core with a locking nut, comprising a valve stem 1 and a main valve core disk 2, an auxiliary valve core disk 3 is fixedly arranged at the end of the valve stem 1, a center hole 4 is opened at one end of the main valve core disk 2, a pressure relief chamber 5 is opened at the other end of the main valve core disk 2, an internal threaded hole is opened inside the pressure relief chamber 5, a rectangular annular groove 6 is opened on the inner wall of the internal threaded hole, the valve stem 1 is slidably inserted in the center hole 4, the auxiliary valve core disk 3 is arranged in the pressure relief chamber 5, and a pressure relief plug 7 is installed on the internal thread of the internal threaded hole, and a retaining ring 8 is clamped in the rectangular annular groove 6.

[0022] A plurality of communication holes 12 are formed on the surface of the main valve core disk 2 . The outlet ends of the communication holes 12 extend into the pressure relief chamber 5 . The auxiliary valve core disk 3 covers the outlet ends of the communication holes 12 .

[0023] The end of the pressure relief plug 7 is provided with a pressure relief hole 13 that runs through the left and right sides. A concave groove is provided on the surface of the end of the pressure relief plug 7 close to the auxiliary valve core disk 3. The inner cavity of the pressure relief cavity 5 is connected with the outside through the concave groove and the pressure relief hole 13. A thread is provided in the pressure relief hole 13. An external thread is provided on the end of the valve stem 1 away from the auxiliary valve core disk 3. An arc-shaped annular groove 14 is provided on the surface of the external thread.

[0024] Among them, the end of the pressure relief plug 7 is provided with an anti-falling step surface, the step surface includes a step end face 9 and a step outer circle 10, the step end face 9 is tightly pressed against the end face of the stop ring 8, and the step outer circle 10 is inserted into the inner hole of the stop ring 8. The anti-falling step surface on the pressure relief plug 7 prevents the stop ring 8 from being squeezed out under a large thrust. An opening 11 is provided on the surface of the stop ring 8, so that the stop ring 8 can be radially elastically compressed, which facilitates the installation and disassembly of the stop ring 8.

[0025] Working principle: Pass the valve stem 1 through the center hole 4 of the main valve core disk 2, screw the pressure relief plug 7 into the pressure relief cavity 5 of the main valve core disk 2, install the retaining ring 8 into the rectangular annular groove 6, and finally install the valve stem 1 and the main valve core disk 2 into the valve seat 15. Figure 5 shown.

[0026] When the oil cylinder of the fast forging machine tool is lifted, the oil cylinder needs to be quickly depressurized, and the filling valve installed on the oil cylinder relieves the pressure of the oil cylinder. The valve stem 1 quickly moves to the left under the push of the control piston and collides with the pressure relief plug 7. The pressure relief plug 7 transmits the thrust to the main valve core disk 2 through the thread and disperses it to each thread of the main valve core disk 2. A gap is created between the auxiliary valve core disk 3 and the inner wall of the pressure relief chamber 5, and then the hydraulic oil flows to the oil tank through the connecting hole 12 and the pressure relief hole 13 to achieve the purpose of pressure relief. When the cylinder pressure drops to a low enough level, the valve stem 1 pushes the pressure relief plug 7 to push the main valve core disk 2 away from the valve seat 15, and the hydraulic oil in the oil cylinder is quickly discharged through the filling valve to achieve the lifting of the machine tool.

[0027] Pushed by the control piston, the valve stem 1 quickly hits the pressure relief plug 7 with a thrust of 20000N (125 diameter), and the force is dispersed to each thread tooth, reducing the impact on the stop ring 8. At the same time, the pressure relief plug 7 supports the stop ring 8 to ensure that the stop ring 8 will not fall out, and the pressure relief plug 7 will not be screwed out, which greatly improves the reliability of the pre-relief valve core to relieve pressure in the cylinder.

[0028] The pre-relief valve core with an anti-loosening nut is formed by slidingly assembling a valve stem 1 and a main valve core disk 2, by arranging a threaded pressure relief plug 7 in the main valve core disk 2, and blocking the pressure relief plug 7 with a stop ring 8 installed at its end, so that the pressure relief plug 7 is prevented from rotating in the thread of the main valve core disk 2 by the stop ring 8, and at the same time, the anti-falling step surface on the pressure relief plug 7 prevents the stop ring 8 from being squeezed out under a large thrust, thereby finally ensuring that the pressure relief plug 7 cannot withdraw from the main valve core disk 2. Compared with the anti-loosening of the pressure relief plug 7 using the anti-retraction screw and glue, the glue is prevented from being separated from the valve core after long-term use, and the pressure relief plug is loosened and screwed out due to the loosening of the anti-retraction screw after high-frequency vibration, thereby achieving the anti-loosening effect.

[0029] The pre-release valve core with anti-loosening nut firstly improves the reliability of parts connection and greatly reduces the reduction of service life of the pre-release filling valve caused by thread loosening. Secondly, it provides structural technical support for the high-speed response of the filling valve. Thirdly, it has a simple structure and is easy to install, which is convenient for realizing intelligent automation of production and manufacturing.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-release valve core with a locking nut, comprising a valve stem (1) and a main valve core disk (2), characterized in that: An auxiliary valve core disk (3) is fixedly arranged at the end of the valve stem (1), a center hole (4) is opened at one end of the main valve core disk (2), a pressure relief chamber (5) is opened at the other end of the main valve core disk (2), an internal threaded hole is opened inside the pressure relief chamber (5), and a rectangular annular groove (6) is opened on the inner wall of the internal threaded hole. The valve stem (1) is slidably inserted into the center hole (4), the auxiliary valve core disk (3) is arranged in the pressure relief chamber (5), and a pressure relief plug (7) is installed in the internal thread of the internal threaded hole, and a retaining ring (8) is clamped in the rectangular annular groove (6).

2. The pre-unloading valve core with a locking nut according to claim 1, characterized in that: The end of the pressure relief plug (7) is provided with an anti-falling step surface, the step surface comprises a step end surface (9) and a step outer circle (10), the step end surface (9) is tightly pressed against the end surface of the stop ring (8), and the step outer circle (10) is inserted into the inner hole of the stop ring (8).

3. The pre-unloading valve core with a locking nut according to claim 2, characterized in that: An opening (11) is provided on the surface of the stop ring (8).

4. The pre-unloading valve core with a locking nut according to claim 3, characterized in that: The surface of the main valve core disk (2) is provided with a plurality of communication holes (12), the outlet ends of the communication holes (12) extend into the pressure relief chamber (5), and the auxiliary valve core disk (3) covers the outlet ends of the communication holes (12).

5. The pre-unloading valve core with a locking nut according to claim 4, characterized in that: The end of the pressure relief plug (7) is provided with a pressure relief hole (13) penetrating left and right, the inner cavity of the pressure relief chamber (5) is connected with the outside through the pressure relief hole (13), and a thread is provided in the pressure relief hole (13).

6. The pre-unloading valve core with a locking nut according to claim 5, characterized in that: An end of the valve stem (1) away from the auxiliary valve core disk (3) is provided with an external thread, and a curved annular groove (14) is provided on the surface of the external thread.

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