CN112253190A - Efficient and high-safety hydraulic prop for coal mine excavation - Google Patents

Abstract

The invention discloses a high-efficiency and high-safety hydraulic prop for coal mining. The first sealing ring is compressed by the first compression sealing body, and the second sealing ring is compressed by the second compression sealing body, so that the second sealing body is sealed with the outer wall of the movable column body. First decontamination plant establishes between second compresses tightly seal and second sealing washer, runs through first decontamination plant and has seted up inlet port and oil outlet, and inlet port and oil outlet are established at the plunger body both sides position. The upper end of the second pressing sealing body is detachably connected with a second decontamination device. This hydraulic prop is used in colliery excavation of high efficiency, high security performance, and seal structure reasonable in design prolongs hydraulic prop one time and supplies for when using. During hydraulic prop recovery, it may be decontaminated. The recovery construction standard is formed, the construction consistency is improved, and the service life of the hydraulic prop is also ensured.

Description

Efficient and high-safety hydraulic prop for coal mine excavation

Technical Field

The invention relates to the technical field of structural design of hydraulic pillars used for coal mine supporting equipment, in particular to a high-efficiency and high-safety hydraulic pillar used for coal mine excavation.

Background

The main body of the existing single hydraulic prop consists of a cylinder barrel, a movable cylinder body and a return spring arranged in the movable cylinder body. When the hydraulic lifting device works, hydraulic oil is needed to fill the inside of the whole movable column body and jack up the movable column body. The single hydraulic prop is commonly used for roof support and end roof support of a coal mine stope face. Therefore, the sealing performance requirement of the movable column body is extremely high, and the requirement of the construction strength can be met.

The existing single hydraulic prop for the plunger mine adopts a plunger technology, a high-pressure sealing surface is arranged on the outer surface structure of a plunger body, and the plunger body is exposed in the air. The existing single hydraulic prop is characterized in that chrome plating or chemical plating is carried out on the outer surface of a plunger, the hardness of the outer surface of the plunger can be improved to a certain degree by the mode, the performance of the plunger is improved, but a plating layer is easy to fall off. In addition, in the recovery process of the plunger, dirt attached to the surface of the plunger is easily brought into the sealing structure, so that the sealing structure is seriously damaged, and the whole usable life cycle of the hydraulic prop is shortened.

Therefore, in the prior art, in the process of recovering the hydraulic prop, the movable prop cannot be cleaned, the cleaning can be completed only by simple cleaning of workers, dirt is easy to enter the sealing structure, the service life of the sealing structure is influenced, and the service life of the whole hydraulic prop is further shortened. Furthermore, in the prior art, the sealing structure is unreasonable in design, the sealing performance cannot be adjusted, the repair rate of the hydraulic prop is high in the long-term use process, the construction strength is increased seriously, and the construction efficiency is delayed.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a hydraulic prop that can prolong the duration of single supply and use, and reduce the repair rate; the decontamination treatment can be carried out on the live column, the service life of the hydraulic prop is ensured, the construction efficiency of the hydraulic prop is also ensured, and the hydraulic prop can be used for coal mine excavation with high efficiency and high safety performance required by the high safety performance of the hydraulic prop.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a high-efficiency and high-safety hydraulic prop for coal mining comprises: the movable cylinder comprises a base, a cylinder barrel, a movable cylinder body and a top cover, wherein the cylinder barrel is fixedly connected to the upper side of the base, the movable cylinder body is connected to the inside of the cylinder barrel in a sliding mode, and the top cover is fixedly connected to the upper end of the movable cylinder body.

In a preferred embodiment, the method further comprises: the sealing device comprises a first sealing body and a second sealing body, wherein the upper end of the cylinder barrel is fixedly connected with the first sealing body, and the upper end of the first sealing body is tightly pressed and hermetically connected with the second sealing body.

In a preferred embodiment, a first sealing cavity is formed in the inner wall of the upper end of the first sealing body, the upper end of the cylinder barrel extends into the bottom of the first sealing cavity, and a first sealing ring is arranged at the upper end of the cylinder barrel.

In a preferred embodiment, a first compression sealing body is arranged at the lower end of the second sealing body, the first compression sealing body extends into the first sealing cavity, the first compression sealing body compresses the first sealing ring to seal the first sealing body and the end part of the cylinder barrel, and the first compression sealing body and the first sealing body are sealed.

In a preferred embodiment, a second sealing cavity is formed in the inner wall of the second sealing body, a plurality of second sealing rings are arranged in the second sealing cavity, a second pressing sealing body is arranged on the upper side of the second sealing body, the second pressing sealing body extends into the second sealing cavity, and the second pressing sealing body presses the second sealing rings to seal the second sealing body and the outer wall of the plunger body.

In a preferred embodiment, the method further comprises: the first decontamination device is arranged between the second compression sealing body and the second sealing ring, the first decontamination device is of an annular structure, a first decontamination cavity is formed in the middle of the first decontamination device, an oil inlet and an oil outlet penetrate through the first decontamination device, and the oil inlet and the oil outlet are formed in the positions on the two sides of the plunger body; adapt to the position of inlet port and oil outlet runs through respectively the conducting hole has been seted up to the second seal, through the oil storage chamber is connected to the conducting hole, and the inside decontamination oil of first decontamination chamber is supplied with in the circulation.

In a preferred embodiment, a second decontamination device is detachably connected to the upper end of the second compressed sealing body, and a second decontamination chamber is formed in the inner wall of the upper end of the second decontamination device; the second decontamination device comprises: the left buckle body is hinged to one end of the right buckle body, and the other ends of the left buckle body and the right buckle body are detachably connected.

In a preferred embodiment, an oil supply hole is arranged at the upper side of the oil inlet hole and communicated between the first decontamination chamber and the second decontamination chamber; an oil discharge hole is arranged at the upper side of the oil outlet hole and communicated between the first decontamination chamber and the second decontamination chamber; the oil supply hole and the oil discharge hole are both formed in the second compression sealing body, and pressure reducing valves are arranged in the oil supply hole and the oil discharge hole.

In a preferred embodiment, the outer wall of the upper side of the cylinder barrel is convexly provided with a connecting lug, a connecting hole is formed in the first sealing body and the second sealing body in a penetrating mode, and a connecting bolt is arranged in the connecting hole and the connecting lug in a penetrating mode, so that the second sealing body, the first sealing body and the cylinder barrel are connected in a pressing and sealing mode.

In a preferred embodiment, the height of the first seal ring is greater than the distance between the first seal body and the second seal body, so that the first seal ring has a predetermined pressing section when the first pressing seal body presses the first seal ring.

In a preferred embodiment, the inner wall of the upper end of the second sealing body is provided with an internal thread, the outer wall of the second compression sealing body is provided with an external thread, and the second compression sealing body is in threaded connection with the second sealing body, so that the second compression sealing body compresses the second sealing ring and can be adjusted.

In a preferred embodiment, a third sealing ring is further provided between the inner wall of the second sealing body and the outer wall of the second compression sealing body.

In a preferred embodiment, a fourth sealing ring is arranged between the inner wall of the second compressed sealing body and the outer wall of the piston cylinder.

In a preferred embodiment, the first decontamination device is provided with an annular cavity on the outer wall, and the oil inlet and the oil outlet communicate the annular cavity with the first decontamination cavity.

In a preferred embodiment, the oil inlet hole and the oil outlet hole are provided in plurality and are respectively and uniformly arranged on two sides of the movable column body.

In a preferred embodiment, two of the through holes are respectively arranged at the middle positions of the oil inlet holes and the oil outlet holes.

In a preferred embodiment, the cross-sectional structure of the upper end of the first decontamination device is a conical structure, and the oil supply hole and the oil discharge hole are both arranged at the upper side of the inclined surface of the conical structure at the side close to the plunger body.

In a preferred embodiment, the oil supply hole and the oil discharge hole are arranged on the left buckling body or the right buckling body together; set up left buckle body or right buckle body bottom in fuel feeding hole and oil drain hole is equipped with buckle spare, adapts to the second compresses tightly the seal upper end and is equipped with the buckle groove, buckle spare with the cooperation of buckle groove is connected.

In a preferred embodiment, the upper end of the second decontamination device projects beyond the second decontamination chamber by a splash shield which is bent downwards.

In a preferred embodiment, the oil supply hole and the oil drain hole are provided with sealing rings at a position between the second compressed sealing body and the second decontamination device.

In a preferred embodiment, an opening of the oil discharge hole inside the second decontamination chamber is provided at a middle portion or a position between the middle portion and the upper end portion of the second decontamination chamber.

In a preferred embodiment, a control handle of the pressure relief valve extends beyond the outer wall of the second compression seal body.

The hydraulic prop for coal mine excavation with high efficiency and high safety performance has the following beneficial effects:

this hydraulic prop is used in colliery excavation of high-efficient, high security performance, and base upside fixedly connected with cylinder, the inside sliding connection live cylinder of cylinder, the fixedly connected with top cap of live cylinder upper end. The upper end of the cylinder barrel is fixedly connected with a first sealing body, and the upper end of the first sealing body is tightly pressed and hermetically connected with a second sealing body. A first sealing cavity is formed in the inner wall of the upper end of the first sealing body, the upper end portion of the cylinder barrel extends into the bottom of the first sealing cavity, and a first sealing ring is arranged at the upper end of the cylinder barrel. The second seal lower extreme is equipped with the first seal that compresses tightly, and the first seal chamber that compresses tightly is stretched into to the first seal that compresses tightly, makes the first seal with seal between the cylinder tip, seal between first seal that compresses tightly and the first seal. The second seal chamber has been seted up to the second seal inner wall, is provided with a plurality of second sealing washers in second seal intracavity portion, and second seal upside is equipped with the second and compresses tightly the seal, and the second compresses tightly the seal and stretches into the second seal chamber, and the second compresses tightly the seal and compresses tightly the second sealing washer, makes between second seal and the post outer wall of living. The first decontamination device is arranged between the second compression sealing body and the second sealing ring, the first decontamination device is of an annular structure, a first decontamination cavity is formed in the middle of the first decontamination device, an oil inlet hole and an oil outlet hole penetrate through the first decontamination device, and the oil inlet hole and the oil outlet hole are formed in the positions of two sides of the plunger body; the position of adaptation inlet port and oil outlet runs through respectively the conducting hole has been seted up to the second seal, connects the oil storage chamber through the conducting hole, and the inside decontamination oil of first decontamination chamber is supplied with in the circulation. The second compresses tightly seal upper end and can dismantle and be connected with second decontamination plant, and second decontamination chamber has been seted up to second decontamination plant upper end inner wall.

The problem of among the prior art, to hydraulic prop recovery process, to the unable cleaning treatment of living column body, can only accomplish through workman's simple cleaning, inside getting into seal structure with the filth easily, influence seal structure's life, and then reduce whole hydraulic prop's life. Furthermore, in the prior art, the sealing structure is unreasonable in design, the sealing performance cannot be adjusted, the repair rate of the hydraulic prop is high in the long-term use process, the construction strength is increased seriously, and the construction efficiency is delayed.

This hydraulic prop is used in colliery excavation of high efficiency, high security performance, and seal structure reasonable in design realizes seal structure's compressing tightly sealed through adjusting, and it is long when extension hydraulic prop single supply is used. Further, the hydraulic prop may be decontaminated during the hydraulic prop recovery process. Can form the construction standard of retrieving at the recovery in-process, the workman is under construction according to the construction standard, improves the uniformity of construction, has also guaranteed hydraulic prop's life, guarantees hydraulic prop's construction high efficiency nature, can guarantee hydraulic prop's high security performance requirement again.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a hydraulic prop at a through bore for efficient, high safety coal mining operations according to one embodiment of the present disclosure;

FIG. 2 is an enlarged view of a portion of the hydraulic prop of FIG. 1 for use in efficient, high safety coal mining according to one embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of a high efficiency, high safety coal mining using hydraulic props at attachment bolts, according to one embodiment of the present disclosure;

fig. 4 is a partial enlarged view of a hydraulic prop for efficient and high safety coal mining according to an embodiment of the present disclosure at B in fig. 3.

[ description of main reference symbols ]

01. The device comprises a base, 02, a cylinder barrel, 021, a connecting lug, 03, a movable column body, 04 and a top cover;

1. a first sealing body 2 and a second sealing body;

3. a first seal ring, 4, a second seal ring;

5. a first compressed sealing body 6 and a second compressed sealing body;

7. the first decontamination device comprises a first decontamination device 71, an oil inlet hole 72, an oil outlet hole 73, a via hole 74 and an annular cavity;

8. a second decontamination device;

9. a first decontamination chamber 10 and a second decontamination chamber;

11. the oil supply hole, 12, the oil discharge hole, 13, the pressure reducing valve, 14, the connecting bolt, 15, the third sealing ring, 16, the fourth sealing ring, 17, the splash guard, 18, the sealing ring, 19 and the connecting notch.

Detailed Description

The efficient and high-safety hydraulic prop for coal mining is further described in detail with reference to the accompanying drawings and embodiments of the invention.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1, 2, 3 and 4, the high-efficiency and high-safety hydraulic prop for coal mining includes: the movable support comprises a base 01 with a supporting function, a cylinder 02 with a connecting function, a movable column 03 with a sliding supporting function and a top cover 04 with a top supporting plate function, wherein the cylinder 02 is fixedly connected to the upper side of the base 01, the movable column 03 is connected to the inside of the cylinder 02 in a sliding mode, and the top cover 04 is fixedly connected to the upper end of the movable column 03.

In order to seal between the cylinder 02 and the end of the plunger 03, the hydraulic prop further comprises: a first sealing body 1 and a second sealing body 2 for sealing. The upper end of the cylinder barrel 02 is fixedly connected with a first sealing body 1, and the upper end of the first sealing body 1 is tightly pressed and hermetically connected with a second sealing body 2.

In order to seal the inner cavity of the cylinder 02 from the outside, it is ensured that the hydraulic oil inside the cylinder 02 can support the piston 02 at a high pressure. First sealed chamber has been seted up to 1 upper end inner wall of first seal, and cylinder 02 upper end stretches into first sealed chamber bottom position (preferred, and cylinder 02 upper end stretches out first sealed chamber bottom certain distance, guarantees that first sealing washer 3 can be more deformation, guarantees the sealed effect to cylinder 02 tip), is provided with first sealing washer 3 in cylinder 02 upper end position.

Preferably, the outer diameter of the cylinder 02 is smaller than the inner diameter of the first seal chamber, and the end of the cylinder 02 is completely covered with the first seal ring 3. A sufficient deformation space of the first sealing ring 3 is ensured, in particular a seal at the upper outer wall of the cylinder 02.

In order to press the first sealing ring 3 tightly, the sealing effect of the cylinder 02 is ensured. This 2 lower extremes of second seal are equipped with (fixed connection or integrated into one piece) the first seal 5 that compresses tightly, and the first seal 5 that compresses tightly stretches into first seal chamber (the first external diameter that compresses tightly seal 5 with first seal chamber is close, clearance fit between the two), and the first seal 3 that compresses tightly seal 5 makes between first seal 2 and the cylinder 02 tip sealed, of course, because under the packing force effect of the first high strength that compresses tightly seal 5, has also guaranteed to compress tightly between seal 5 and the first seal 2.

In order to achieve a seal between the second sealing body 2 and the plunger 03; it is further ensured that the first sealing ring 3 and the plunger slide relative to each other, and the sealing performance is not good between the relatively static parts, so that the hydraulic oil leaking from the inside of the cylinder 02 can not leak outwards. The second seal chamber has been seted up to 2 inner walls of second seal, is provided with a plurality of second sealing washers 4 (preferred, set up in succession) in second seal intracavity portion, and 2 upsides of second seal are equipped with the second and compress tightly seal 6, and the second compresses tightly seal 6 and stretches into the second seal chamber, and the second compresses tightly seal and compresses tightly second sealing washer 4, makes and seals between second seal 2 and the plunger 03 outer wall. In the use, according to the number of times of use or detect the oil leak condition, the packing force of second seal 4 to second seal 6 is compressed tightly in the regulation of adaptability, guarantees the sealing performance of second seal 4.

In order to timely clean up the dirt on the outer wall of the movable column body 03 in the hydraulic support column recycling process, the damage to an internal sealing structure is avoided, the defect of the supporting performance of the movable column body 03 is further reduced, and the high safety performance of the hydraulic support column is guaranteed. Particularly, the defects that the construction efficiency and the construction safety are reduced because the hydraulic prop with leaked oil needs to be replaced in the using process are overcome; in order to ensure efficient performance of the hydraulic prop. The hydraulic prop further includes: a first decontamination means 7 for high pressure decontamination and a second decontamination means 8 for low pressure decontamination. In the recovery process of the movable column body 03, the movable column body 03 is decontaminated twice, so that the decontamination effect is ensured, the sealing performance of the hydraulic support column is protected, and the safety performance of the hydraulic support column and the high efficiency of coal mine construction are improved. The first decontamination plant 7 is arranged between the second pressing sealing body 6 and the second sealing ring 4, the first decontamination plant 7 is pressed through the second pressing sealing body 6, the second sealing ring 4 is further pressed by the first decontamination plant 7, and the sealing performance of the position of the second decontamination plant 8 is also ensured. In order to ensure the compression sealing performance of the second sealing ring 4, the bottom of the second decontamination device 8 is of an annular structure, so that the compression area of the second sealing ring 4 is ensured, and the sealing performance of the second sealing ring 4 is ensured.

Preferably, in order to realize the decontamination effect of the first decontamination device 7 on the outer wall of the whole live cylinder 03, a circulating decontamination oil can be formed inside the first decontamination device 7, so as to ensure the decontamination effect. The first decontamination device 7 is of an annular structure, the middle part of the first decontamination device 7 is provided with a first decontamination chamber 9, an oil inlet 71 and an oil outlet 72 are formed through the first decontamination device 7, and the oil inlet 71 and the oil outlet 72 are formed in the positions on the two sides of the movable cylinder 03. Oil is fed into the oil inlet hole 71, oil is discharged from the oil outlet hole 72, and circulating decontamination oil is formed inside the whole first decontamination chamber 9, so that the outer wall of the movable cylinder 03 is cleaned. Certainly, in order to supply the circulating decontamination oil to the interior of the first decontamination chamber 9 in the recovery process, the positions of the oil inlet hole 71 and the oil outlet hole 72 are adapted, the through hole 73 is respectively formed through the second sealing body, the through hole 73 is connected with the oil storage chamber, and the circulation supply of the decontamination oil to the interior of the first decontamination chamber 9 is realized.

Because the movable column body 03 is usually a hydraulic support after being used in the recovery process, a large amount of dirt is attached to the outer wall of the movable column body 03 due to the severe working environment under the coal mine. In order to clean the plunger 03 in its surface a first step before it enters the interior of the seal. The upper end of the second pressing sealing body 6 is detachably connected with a second decontamination device 8, and a second decontamination chamber 10 is arranged on the inner wall of the upper end of the second decontamination device 8. The inside of the second decontamination chamber 10 is also supplied with decontamination oil, and the second decontamination chamber 10 is in an open shape, so that the contamination can be removed by the decontamination oil inside the second decontamination chamber 10 on the premise that the contamination is not clamped into the sealing structure and damaged. In order to clean the second decontamination device 8 after the recovery, the second decontamination device 8 includes, because of the large amount of dirt inside the second decontamination device and the granularity angle, the dirt is directly taken away by the decontamination oil and is easy to block the pipeline: the left buckle body is hinged to one end of the right buckle body, and the other end of the left buckle body is detachably connected with the other end of the right buckle body. Namely: the left buckle body and the right buckle body are respectively of a semicircular annular structure and are similar to a connection mode of a hoop structure. And a second decontamination cavity 10 is arranged at the upper ends of the inner walls of the left buckle body and the right buckle body.

In order to supply the second soil removal chamber 10 with the soil removal oil, a pressure difference is also realized, which ensures that a soil removal oil circulation is formed inside the second soil removal chamber 10. An oil supply hole 11 is arranged at the upper side of the oil inlet hole 71 and communicated between the first decontamination chamber 9 and the second decontamination chamber 10. An oil discharge hole 12 is arranged at the upper side position of the oil outlet hole 72 and communicated between the first decontamination chamber 9 and the second decontamination chamber 10. The pressure of the oil inlet 71 connected with the oil supply hole 11 is high, and the supply of the decontamination oil is ensured. The oil outlet 72 connected with the oil outlet 12 has lower pressure, and the drainage of the decontamination oil is ensured. To further ensure that the pressure inside the second decontamination chamber 10 is adjustable. Both the oil supply hole 11 and the oil discharge hole 12 are provided in the second packing 6, and a pressure reducing valve 13 is provided in the oil supply hole 11 and the oil discharge hole 12.

Preferably, connect the oil storage chamber at inlet port 71 end to not connect pressure device, and connect suction device at outlet port 72 end, make whole first decontamination chamber 9 inside be the negative pressure state, further can guarantee to the timely suction of the inside filth in first decontamination chamber 9 clean, guarantee the safe in utilization of live cylinder 03.

In particular, the first sealing body 1 and the second sealing body 2 can be pressed together. The outer wall of the upper side of the cylinder barrel 02 is convexly provided with a connecting lug 021, a connecting hole is arranged through the first sealing body 1 and the second sealing body 2, and a connecting bolt 14 is arranged through the connecting hole and the connecting lug 021, so that the second sealing body 2, the first sealing body 1 and the cylinder barrel 02 are tightly pressed and hermetically connected; through adjusting bolt, realize compressing tightly the regulation to second seal 2 and first seal 5 that compresses tightly, guarantee to the sealed effect of compressing tightly of first sealing washer 3. In the long-term use process, can guarantee the sealed effect of third sealing washer 3 through adjusting connecting bolt 14.

Preferably, the handle body is provided on the outer wall of the first sealing body 1.

In order to conveniently realize the adjusting function of the connecting bolt 14, the height of the first sealing ring 3 is greater than the distance between the first sealing body 1 and the second sealing body 2, so that when the first pressing sealing body 5 presses the first sealing ring 3, the first sealing ring 3 has a set pressing interval. Namely: a certain space is reserved for the compression deformation of the first sealing ring 3, the sealing strength of the first sealing ring 3 can be adjusted through the compression effect of the first compression sealing body 5, and the sealing performance of the first sealing ring 3 in the long-term use process is guaranteed.

Preferably, in order to reserve certain connection space for the connecting bolt 14, the outer wall of the second sealing body 2 is provided with a connecting notch 19, and a nut connected with the connecting bolt 14 is arranged inside the connecting notch 19, so that the rationality of the connection structure is ensured.

To facilitate the adjustment of the compression of the second compression seal body 6. Be equipped with the internal thread at second seal 2 upper end inner wall, the second compresses tightly 6 outer walls of seal and is equipped with the external screw thread, and the second compresses tightly threaded connection between seal 6 and the second seal 2, makes the second compress tightly seal 6 and compress tightly second sealing washer 4 and can adjust. Because the second sealing ring 4 is in the long-term use process, because of the relative friction between the second sealing ring 4 and the plunger 03, the defect that the second sealing ring 4 is worn easily occurs. In order to conveniently and quickly adjust the sealing performance of the second sealing ring 4, the second sealing ring 4 is compressed through the second compression sealing body 6, the sealing performance of the second sealing ring 4 is improved, and the sealing performance of the whole hydraulic prop is guaranteed.

In order to achieve a sealing behavior between the second sealing body 2 and the second sealing body 6. A third sealing ring 15 is arranged between the inner wall of the second sealing body 2 and the outer wall of the second compression sealing body 6.

In order to ensure the sealing performance between the second compressed sealing body 6 and the plunger 03. A fourth sealing ring 16 is arranged between the inner wall of the second pressing sealing body 6 and the outer wall of the movable cylinder body 03. Because the upper side and the lower side of the fourth sealing ring 16 are provided with the first decontamination chamber 9 and the second decontamination chamber 10, the requirement on the sealing performance of the fourth sealing ring 16 is not high, and the requirement can be met by proper sealing performance.

In order to be more beneficial to the circulation of the decontamination oil, the supporting performance of the first decontamination device 7 can be ensured, and the pressing force on the second sealing ring 4 is ensured. The outer wall of the first decontamination device 7 is provided with an annular cavity 74, and the oil inlet hole 71 and the oil outlet hole 72 are communicated with the annular cavity 74 and the first decontamination cavity 9.

The oil inlet hole 71 and the oil outlet hole 72 are provided in plurality and are respectively and uniformly arranged on two sides of the movable cylinder 03.

The two communication holes 73 are respectively provided at the middle positions of the plurality of oil inlet holes 71 and the middle positions of the plurality of oil outlet holes 72.

Preferably, the cross section of the first decontamination device 7 is in an I-shaped structure, which leaves space for the ring cavity 74 and the first decontamination chamber 9.

Preferably, to avoid clogging of the oil supply hole 11 and the oil discharge hole 12 by the first decontamination means 7. The cross section structure of the upper end part of the first decontamination device 7 is a conical structure, and an oil supply hole 11 and an oil discharge hole 12 are arranged at the upper side of the inclined plane at one side of the conical structure close to the movable cylinder 03. The oil supply hole 11 and the oil discharge hole 12 are ensured to be bent as little as possible, and the defect of interference with the third sealing ring 15 can be avoided.

The second decontamination device 8 can be conveniently detached and conveniently installed, and particularly, the interference generated when the second decontamination device is connected with the oil supply hole 11 and the oil discharge hole 12 is avoided. The oil supply hole 11 and the oil discharge hole 12 are arranged on the left buckle body or the right buckle body together; set up the left side buckle body or the right side buckle body bottom of fuel feeding hole 11 and oil drain hole 12 and be equipped with buckle spare, adapt to the second and compress tightly 6 upper ends of seal and be equipped with the buckle groove, buckle spare with the cooperation of buckle groove is connected. Therefore, in the installation process, the left buckle body or the right buckle body which is provided with the oil supply hole 11 and the oil discharge hole 12 is installed, and then the other half is connected in a rotating mode.

In order to avoid the splashing of the dirty oil inside the second decontamination device 8 during the use process and influence the recovery process, the upper end of the second decontamination device 8 extends out of the splash-proof plate 17 towards the second decontamination chamber 10, and the splash-proof plate 17 is bent downwards to further prevent the splashing of the dirty oil.

In order to facilitate the sealing connection between the oil supply holes 11 on the two sides and the connection between the oil discharge holes 12 at the position between the second compression sealing body 6 and the second decontamination device 8, the oil supply holes 11 and the oil discharge holes 12 are provided with sealing rings 18 at the position between the second compression sealing body 6 and the second decontamination device 8, and the sealing effect is ensured by realizing the seamless connection between the two sections through the sealing rings 18.

In order to ensure the circulation of the decontamination oil in the second decontamination chamber 10, the dirt can be remained in the second decontamination chamber 10, so that the circulation flow of the decontamination oil is ensured, and the decontamination effect is improved. The opening of the oil drain hole 12 inside the second decontamination chamber 10 is provided at the middle portion of the second decontamination chamber 10 or at a position between the middle portion and the upper end portion. Dirt settles at the bottom of the second decontamination chamber 10 and relatively clean decontaminated oil is circulated into the oil drain hole 12.

In order to facilitate the adjustment of the pressure relief valve 13, the control handle of the pressure relief valve 13 protrudes out of the outer wall of the second pressure body 6.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (10)

1. The utility model provides a hydraulic prop is used in colliery excavation of high-efficient, high security performance which characterized in that includes: the movable cylinder body comprises a base (01), a cylinder barrel (02), a movable cylinder body (03) and a top cover (04), wherein the cylinder barrel (02) is fixedly connected to the upper side of the base (01), the movable cylinder body (03) is connected to the inside of the cylinder barrel (02) in a sliding mode, and the top cover (04) is fixedly connected to the upper end of the movable cylinder body (03);

further comprising: the sealing device comprises a first sealing body (1) and a second sealing body (2), wherein the upper end part of the cylinder barrel (02) is fixedly connected with the first sealing body (1), and the upper end of the first sealing body (1) is tightly pressed and hermetically connected with the second sealing body (2);

a first sealing cavity is formed in the inner wall of the upper end of the first sealing body (1), the upper end of the cylinder barrel (02) extends into the bottom of the first sealing cavity, and a first sealing ring (3) is arranged at the upper end of the cylinder barrel (02);

a first compression sealing body (5) is arranged at the lower end of the second sealing body (2), the first compression sealing body (5) extends into the first sealing cavity, the first compression sealing body (5) compresses the first sealing ring (3) to seal the first sealing body (2) and the end part of the cylinder barrel (02), and the first compression sealing body (5) and the first sealing body (2) are sealed;

a second sealing cavity is formed in the inner wall of the second sealing body (2), a plurality of second sealing rings (4) are arranged in the second sealing cavity, a second pressing sealing body (6) is arranged on the upper side of the second sealing body (2), the second pressing sealing body (6) extends into the second sealing cavity, and the second pressing sealing body presses the second sealing rings (4), so that the second sealing body (2) and the outer wall of the movable column body (03) are sealed;

further comprising: the first decontamination device (7) is arranged between the second compression sealing body (6) and the second sealing ring (4), the first decontamination device (7) is of an annular structure, a first decontamination cavity (9) is formed in the middle of the first decontamination device (7), an oil inlet hole (71) and an oil outlet hole (72) penetrate through the first decontamination device (7), and the oil inlet hole (71) and the oil outlet hole (72) are formed in the positions of the two sides of the movable column body (03); adapting to the positions of the oil inlet hole (71) and the oil outlet hole (72), respectively penetrating through the second sealing body to be provided with a via hole (73), connecting the oil storage cavity through the via hole (73), and circularly supplying the oil to the inside of the first decontamination cavity (9);

the upper end of the second pressing sealing body (6) is detachably connected with a second decontamination device (8), and a second decontamination cavity (10) is formed in the inner wall of the upper end of the second decontamination device (8); the second decontamination device (8) comprises: the left buckling body is hinged with one end of the right buckling body, and the other ends of the left buckling body and the right buckling body are detachably connected;

an oil supply hole (11) is arranged at the upper side of the oil inlet hole (71) and communicated between the first decontamination cavity (9) and the second decontamination cavity (10); an oil discharge hole (12) is arranged at the upper side position of the oil outlet hole (72) and communicated between the first decontamination chamber (9) and the second decontamination chamber (10); oil supply hole (11) and oil drain hole (12) all set up inside second compresses tightly sealing body (6) oil supply hole (11) and oil drain hole (12) are inside to be equipped with relief pressure valve (13).

2. The high-efficiency and high-safety hydraulic prop for coal mine excavation according to claim 1, wherein a connecting lug (021) is convexly arranged on the outer wall of the upper side of the cylinder barrel (02), a connecting hole is formed in the first sealing body (1) and the second sealing body (2) in a penetrating mode, and a connecting bolt (14) is arranged in the connecting hole and the connecting lug (021) in a penetrating mode, so that the second sealing body (2), the first sealing body (1) and the cylinder barrel (02) are connected in a pressing and sealing mode;

the height of the first sealing ring (3) is larger than the distance between the first sealing body (1) and the second sealing body (2), so that when the first pressing sealing body (5) presses the first sealing ring (3), the first sealing ring (3) has a set pressing interval.

3. The high-efficiency and high-safety hydraulic prop for coal mining use is characterized in that an inner wall of the upper end of the second sealing body (2) is provided with an internal thread, an outer wall of the second compression sealing body (6) is provided with an external thread, and the second compression sealing body (6) is in threaded connection with the second sealing body (2) so that the second compression sealing body (6) compresses the second sealing ring (4) and can be adjusted.

4. A high-efficiency high-safety hydraulic prop for coal mining use according to claim 3, characterized in that a third sealing ring (15) is further arranged between the inner wall of the second sealing body (2) and the outer wall of the second pressing sealing body (6).

5. The high-efficiency high-safety hydraulic prop for coal mining use according to claim 1, characterized in that a fourth sealing ring (16) is arranged between the inner wall of the second compression sealing body (6) and the outer wall of the piston cylinder body (03).

6. The high-efficiency and high-safety hydraulic prop for coal mine mining use is characterized in that an annular cavity (74) is formed in the outer wall of the first decontamination device (7), and the oil inlet hole (71) and the oil outlet hole (72) are communicated with the annular cavity (74) and the first decontamination cavity (9);

a plurality of oil inlet holes (71) and a plurality of oil outlet holes (72) are uniformly formed in the two sides of the movable cylinder body (03) respectively;

the two conducting holes (73) are respectively arranged in the middle positions of the oil inlet holes (71) and the oil outlet holes (72).

7. The high-efficiency and high-safety hydraulic prop for coal mine mining use according to claim 6, wherein the cross-sectional structure of the upper end of the first decontamination device (7) is a tapered structure, and the oil supply hole (11) and the oil discharge hole (12) are both provided at the upper side of the inclined surface of the tapered structure on the side close to the movable cylinder (03).

8. The high-efficiency high-safety hydraulic prop for coal mine excavation according to claim 1, wherein the oil supply hole (11) and the oil discharge hole (12) are provided together on the left or right snap-in body; the bottom of the left buckle body or the right buckle body of the oil supply hole (11) and the oil discharge hole (12) is provided with a buckle part, the buckle part is adapted to the upper end of the second compression sealing body (6) and is matched and connected with the buckle groove.

9. An efficient and high safety hydraulic prop for coal mine mining according to claim 1, characterized in that the upper end of the second decontamination device (8) protrudes a splash guard (17) towards the second decontamination chamber (10), the splash guard (17) being bent downwards.

10. A high efficiency, high safety hydraulic prop for coal mining applications according to claim 1, characterized in that the oil supply hole (11) and the oil drain hole (12) are provided with sealing rings (18) at a position between the second compressed sealing body (6) and the second de-contamination device (8);

the opening of the oil discharge hole (12) in the second decontamination chamber (10) is arranged in the middle of the second decontamination chamber (10) or between the middle and the upper end;

and a control handle of the pressure reducing valve (13) extends out of the outer wall of the second pressing sealing body (6).

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