An inflatable one-way valve and a double telescopic hydraulic cylinder

Abstract

The present invention discloses an inflatable one-way valve and a double telescopic hydraulic cylinder, which relates to the technical field of one-way valves, including a guide sleeve, a liquid sleeve, a push rod, a valve core and a gas sleeve, wherein a through hole is provided on the guide sleeve, one end of the liquid sleeve is detachably connected to the guide sleeve, and the other end is detachably connected to the gas sleeve, one end of the valve core forms a sliding sealed air cavity with the gas sleeve, and the other end is connected to one end of the push rod, and the other end of the push rod penetrates and extends out of the guide sleeve. The present invention adopts a sealed air cavity as an elastic element, thereby avoiding the shaking and whistling of the extension column caused by the mismatch between the mechanical spring P value and the sealing area of ​​the sealing pair, and at the same time, the compression is stable, the stroke is large, and the response is fast.

Description

Technical Field

[0001] The invention relates to the technical field of one-way valves, in particular to an inflatable one-way valve and a double telescopic hydraulic cylinder. Background Art

[0002] The one-way valve for the hydraulic support column in coal mines is also called the bottom valve. It is a mechanical opening one-way valve. It is a necessary valve for the double telescopic columns of the hydraulic support in coal mines. It controls the telescopic sequence of the columns and ensures that the columns have the same working resistance in the entire stroke range. Its reliability affects the bearing capacity and reliability of the columns. Due to design, processing, and selection and matching reasons, some problems are exposed in actual use, such as the shaking of the columns and the occasional whistling sound when the secondary cylinder is raised; the extension of the secondary cylinders of the double columns is not synchronized; the live column comes out first without the secondary cylinder moving, etc., which seriously affect the support capacity of the hydraulic support and pose certain safety hazards. Summary of the invention

[0003] The purpose of the present invention is to provide an inflatable one-way valve and a double telescopic hydraulic cylinder to solve the problems of the above-mentioned prior art such as the shaking, whistling, the first extension of the active column and the asynchronism when the column secondary cylinder is extended, so that the double column secondary cylinders can be extended synchronously to avoid the shaking and whistling when the column secondary cylinder is extended.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides an inflatable one-way valve, comprising a guide sleeve, a liquid sleeve, a push rod, a valve core and an air sleeve, wherein the guide sleeve is provided with a through hole, one end of the liquid sleeve is detachably connected to the guide sleeve, and the other end is detachably connected to the air sleeve, one end of the valve core forms a sliding sealed air cavity with the air sleeve, and the other end is connected to one end of the push rod, and the other end of the push rod passes through and extends out of the guide sleeve.

[0006] Preferably, one end of the fluid jacket is connected to the guide sleeve internal thread and connected to the air jacket through an external thread with the hydraulic column cylinder, and the other end is connected to the air jacket through an external thread.

[0007] Preferably, the valve core sliding sleeve is arranged in the air sleeve, and the length of the air sleeve is greater than the length of the valve core, and an air sealing component is arranged between the valve core and the air sleeve.

[0008] Preferably, a gas sealing groove is provided at the bottom of the gas sleeve, a gas injection hole is opened on the side wall of the gas sealing groove, a plug is provided on the gas injection hole, and the gas injection hole is used to inject sealing gas into the gas cavity.

[0009] Preferably, an air hole sealing ring is arranged in the air sealing groove, and the cross section of the air hole sealing ring is rectangular and can cover the air injection hole.

[0010] Preferably, the sealing gas in the air cavity is nitrogen.

[0011] Preferably, the valve core forms a rigid sealing pair with the end of the liquid jacket through a valve seat.

[0012] Preferably, a limiting shoulder is provided in the middle of the push rod, and the end of the push rod is inserted into the insertion groove of the valve core, and the push rod and the valve core are clearance-matched.

[0013] Preferably, a plurality of through holes are evenly distributed on the end surface of the guide sleeve, and the through holes are used for liquid supply and filtration.

[0014] Preferably, a sealing ring is provided between the ends of the liquid jacket and the gas jacket, and an inclined flow hole is provided on the side wall of the gas jacket.

[0015] The invention also discloses a double telescopic hydraulic cylinder, the bottom valve of which uses the above-mentioned inflatable one-way valve.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention adopts the sealing air cavity as the elastic element, thereby avoiding the vibration and howling of the extension column caused by the mismatch between the P value of the mechanical spring and the sealing area of ​​the sealing pair, and at the same time, the compression is stable, the stroke is large, and the response is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an inflatable one-way valve in an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a guide sleeve in an embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a double telescopic hydraulic cylinder in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the operating principle of the double telescopic hydraulic cylinder in an embodiment of the present invention;

[0023] In the figure: 1-guide sleeve, 2-liquid jacket, 3-pusher, 4-valve seat, 5-valve core, 6-gas seal assembly, 7-gas sleeve, 8-plug, 9-air hole sealing ring, 10-inflatable one-way valve, 11-double telescopic hydraulic cylinder, 12-sealing ring, 13-flow hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide an inflatable one-way valve and a double telescopic hydraulic cylinder to solve the problems of the above-mentioned prior art such as the shaking, whistling, the first extension of the active column and the asynchronism when the column secondary cylinder is extended, so that the double column secondary cylinders can be extended synchronously to avoid the shaking and whistling when the column secondary cylinder is extended.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Embodiment 1

[0028] like Figure 1 to Figure 2 As shown, in this embodiment, an inflatable one-way valve 10 is provided, including a guide sleeve 1, a liquid sleeve 2, a push rod 3, a valve core 5 and an air sleeve 7. A through hole is provided on the guide sleeve 1, one end of the liquid sleeve 2 is detachably connected to the guide sleeve 1, and the other end is detachably connected to the air sleeve 7, one end of the valve core 5 forms a sliding sealed air cavity with the air sleeve 7, and the other end is connected to one end of the push rod 3, and the other end of the push rod 3 passes through and extends out of the guide sleeve 1.

[0029] As an optional solution, in this embodiment, three specifications of threads are opened on the liquid jacket 2. One end of the liquid jacket 2 is connected to the internal thread of the guide sleeve 1 and is connected to the air jacket 7 through an external thread with the hydraulic column cylinder. The other end is connected to the air jacket 7 through an external thread and is fixed to the hydraulic secondary cylinder with threads. The overall installation is simple.

[0030] As an optional solution, in this embodiment, the valve core 5 is slidingly sleeved in the gas sleeve 7, and the length of the gas sleeve 7 is greater than the length of the valve core 5, and a gas seal assembly 6 is arranged between the valve core 5 and the gas sleeve 7 to form an elastic element for sealing gas. Among them, the gas seal assembly 6 includes a sealing ring 12 with a rectangular cross section and two gaskets, the two gaskets are respectively located on both sides of the sealing ring 12, and the material of the gasket is polytetrafluoroethylene to achieve the sealing of the air cavity.

[0031] As an optional solution, in this embodiment, an air injection hole is opened on the side wall of the air sealing groove, and a plug 8 is provided on the air injection hole. The air injection hole is used to inject sealing gas into the air cavity. The plug 8 is used for the air injection hole, and the sealing gas is used as an elastic element to avoid the vibration and howling of the extension column caused by the mismatch between the mechanical spring P value and the sealing area of ​​the sealing pair. The air pressure of the sealing gas in the air cavity is generally 0.5-1.5MPa, which is calculated based on the friction force plus load resistance of the inner wall of the first cylinder and the second cylinder seal. The force of this air pressure on the valve core is slightly greater than the friction force plus load resistance between the first cylinder and the second cylinder; the plug is made of stainless steel plus PU sealing ring.

[0032] As an optional solution, in this embodiment, a gas sealing groove is provided at the bottom of the gas sleeve 7, and a gas hole sealing ring 9 is provided in the gas sealing groove. The cross section of the gas hole sealing ring 9 is rectangular and can cover the gas injection hole. The gas hole sealing ring 9 is used to seal the gas injection hole from the inside. As an optional solution, the sealing gas in the gas cavity in this embodiment is nitrogen, which is stable in state. Nitrogen acts as an elastic element to compress smoothly, has a large stroke, and responds quickly.

[0033] As an optional solution, in this embodiment, the valve core 5 forms a rigid sealing pair with the end of the liquid jacket 2 through a valve seat 4. The valve core 5 and the valve seat 4 are a steel-steel sealing pair with high compressive strength and strong pollution resistance, which improves the compressive strength and service life of the product.

[0034] As an optional solution, in this embodiment, a limiting shoulder is provided in the middle of the push rod 3 and is located on the inner side of the guide sleeve 1, which is used to limit the movement range of the push rod 3 and prevent it from falling. The end of the push rod 3 is inserted into the insertion groove of the valve core 5, and the push rod 3 and the valve core 5 are matched with each other in a clearance, which can ensure that the push rod 3 does not deviate when pushed by an external force.

[0035] As an optional solution, in this embodiment, a number of through holes are evenly distributed on the end surface of the guide sleeve 1. The size of the aperture can be determined according to the liquid supply flow rate requirements. Increasing the number of holes can increase the flow rate. At the same time, the filtering accuracy can be considered. For example, if the filtering accuracy is required to be 80μm, the aperture is less than 80μm. The aperture size can be determined based on the flow rate and filtering requirements. The through holes are used for liquid supply and filtration. Liquid can be supplied to the interior and particles larger than the diameter of the small holes can be blocked. By controlling the size of the through holes on the guide sleeve 1, large particles in the medium can be blocked from entering the interior of the product, thereby avoiding the phenomenon that large particles are stuck in the seal and cause the piston to come out first and the two columns to extend asynchronously, and can also prevent medium pollution from damaging the equipment.

[0036] As an optional solution, in this embodiment, a sealing ring 12 is provided between the ends of the liquid jacket 2 and the gas jacket 7, and a gasket is provided on each side of the sealing ring, which can prevent the liquid in the first cylinder from entering the second cylinder cavity without passing through the valve core and the valve seat seal; an inclined flow hole 13 is opened on the side wall of the gas jacket 7, and the flow hole 13 allows the liquid to flow in more smoothly after the valve core and the valve seat are opened.

[0037] Embodiment 2

[0038] like Figure 3 to Figure 4 As shown, this embodiment discloses a double telescopic hydraulic cylinder 11, and the bottom valve of the double telescopic hydraulic cylinder 11 uses the above-mentioned inflatable check valve 10. The specific operating principle is as follows Figure 4 As shown, when the hydraulic pressure in the first cylinder is greater than the pressure of the sealed gas in the air cavity, the flow hole 13 opens and the piston in the second cylinder extends. The double telescopic hydraulic cylinder of this embodiment uses the sealed air cavity as an elastic element, avoiding the vibration and howling of the extension column caused by the mismatch between the mechanical spring P value and the sealing area of ​​the sealing pair, while achieving stable compression, large stroke and fast response.

[0039] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An inflatable one-way valve, characterized in that: It comprises a guide sleeve, a liquid sleeve, a push rod, a valve core and an air sleeve, wherein the guide sleeve is provided with a through hole, one end of the liquid sleeve is detachably connected to the guide sleeve, and the other end is detachably connected to the air sleeve, one end of the valve core forms a sliding sealed air cavity with the air sleeve, and the other end is connected to one end of the push rod, and the other end of the push rod passes through and extends out of the guide sleeve; a plurality of through holes are evenly distributed on the end surface of the guide sleeve, and the through holes are used for liquid supply and filtration; an air sealing groove is provided at the bottom of the air sleeve, an air injection hole is opened on the side wall of the air sealing groove, a plug is provided on the air injection hole, and the air injection hole is used to inject sealing gas into the air cavity, an air hole sealing ring is provided in the air sealing groove, and the cross section of the air hole sealing ring is rectangular and can cover the air injection hole; a limiting shoulder is provided in the middle of the push rod, and the end of the push rod is plugged into the plug-in groove of the valve core, and the push rod and the valve core are gap-matched.

2. The inflatable one-way valve according to claim 1, characterized in that: One end of the fluid jacket is connected to the guide sleeve internal thread and is connected to the air jacket through the external thread with the hydraulic column cylinder, and the other end is connected to the air jacket through the external thread.

3. The inflatable one-way valve according to claim 1, characterized in that: The valve core sliding sleeve is arranged in the air sleeve, and the length of the air sleeve is greater than the length of the valve core. An air sealing component is arranged between the valve core and the air sleeve.

4. The inflatable one-way valve according to claim 1, characterized in that: The sealing gas in the air cavity is nitrogen.

5. The inflatable one-way valve according to claim 1, characterized in that: The valve core forms a rigid sealing pair with the end of the liquid jacket through a valve seat.

6. The inflatable one-way valve according to claim 1, characterized in that: A sealing ring is arranged between the ends of the liquid jacket and the gas jacket, and an inclined flow hole is opened on the side wall of the gas jacket.

7. A double telescopic hydraulic cylinder, characterized in that: The bottom valve of the double telescopic hydraulic cylinder uses the inflatable one-way valve described in any one of claims 1-6.

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