CN115163144A - Three flexible stands of degradable high reliability - Google Patents
Three flexible stands of degradable high reliability Download PDFInfo
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- CN115163144A CN115163144A CN202210992462.0A CN202210992462A CN115163144A CN 115163144 A CN115163144 A CN 115163144A CN 202210992462 A CN202210992462 A CN 202210992462A CN 115163144 A CN115163144 A CN 115163144A
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- 239000007788 liquid Substances 0.000 claims abstract description 65
- 238000004891 communication Methods 0.000 claims description 3
- 239000003245 coal Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/512—Arrangement of valves
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention provides a three-telescopic stand column capable of reducing pressure and high in reliability, which comprises a primary cylinder body, wherein a secondary cylinder body is arranged in the primary cylinder body, a tertiary cylinder body is arranged in the secondary cylinder body, a plunger is arranged in the tertiary cylinder body, a pressure reducing rod is arranged in the plunger, pistons and guide sleeves are arranged at two sides between the plunger and the pressure reducing rod, and a threaded hole is formed at one end of the pressure reducing rod; a third-stage cylinder opening guide sleeve assembly is arranged at one end inside the third-stage cylinder body, a second-stage cylinder opening guide sleeve assembly is arranged at one end inside the second-stage cylinder body, a first-stage cylinder opening guide sleeve assembly is arranged at one end inside the first-stage cylinder body, and a boss capable of being communicated with liquid is arranged at the bottom of the second-stage cylinder body; the bottom valve of the third-stage cylinder body is arranged in the middle; a fixing screw hole is arranged on the bottom of the third-stage cylinder body, and the pressure reducing rod is fixed on the bottom of the third-stage cylinder body; the threaded hole at one end of the pressure reducing rod is drilled through and is superior to the blind thread hole.
Description
Technical Field
The invention relates to a three-telescopic stand column capable of reducing pressure and high in reliability, which is used for a hydraulic support with a large telescopic ratio and belongs to the technical field of coal mining support.
Background
At present, the hydraulic support upright post for supporting the coal mining working face mainly has three forms: single flexible stand, single flexible extension bar stand, two flexible stands of adding machinery. The double telescopic columns have large telescopic ratio, and can meet the requirements of most coal mines. But the coal seam of few mining areas has the thickness frequent change, especially when needing to cross the fault, requires that the lift range of hydraulic support stand is bigger, the reliability is higher. The existing double-telescopic upright column needs to increase the forward inclination angle of the upright column in order to meet the requirement of large telescopic ratio of the hydraulic support, so that the stress of a hydraulic support part is increased, and the support efficiency is reduced. Even so, the two flexible stands of some special coal seams also can't satisfy highest, minimum requirement, must use three flexible stands.
When the three telescopic upright columns are designed according to the rated working resistance, the pressure bearing in the three-stage cylinder is overhigh. The pressure bearing in the three-stage cylinder is too high, and the following three conditions can be caused: (1) when the upright post is normally loaded, the pressure difference between the three-stage cylinder and the two-stage cylinder exceeds the reverse opening pressure of the bottom valve, so that the bottom valve is reversely opened, the supporting force provided by the upright post cannot reach the rated working resistance, and the plunger retracts. (2) When the upright post normally bears the load, the sealing bearing pressure of the piston of the three-stage cylinder exceeds the bearing limit, the supporting force provided by the upright post cannot reach the rated working resistance, and the plunger retracts. (3) When the upright post normally bears the load, the stress borne by the three-level cylinder barrel exceeds the yield limit of the material, the cylinder barrel expands to generate plastic deformation and even explode, and the safety of a working face is seriously influenced.
Therefore, there is a need to provide a three telescopic column with high pressure reduction and reliability to solve the above technical problems.
Disclosure of Invention
1. According to the invention, the boss capable of being filled with liquid is arranged on the cylinder bottom of the secondary cylinder body, so that the bottom valve of the tertiary cylinder body is arranged in the middle, and the manufacturing difficulty is reduced.
2. According to the invention, the fixing screw is arranged on the bottom of the three-stage cylinder body, and the pressure reducing rod is fixed on the bottom of the three-stage cylinder body, so that the high pressure in the three-stage cylinder can be reduced by 30%, and the reliability of the three telescopic upright columns is improved.
In order to solve the technical problems, the three-telescopic-column capable of reducing pressure and high reliability provided by the invention comprises a primary cylinder body, wherein a secondary cylinder body is arranged in the primary cylinder body, a tertiary cylinder body is arranged in the secondary cylinder body, a plunger is arranged in the tertiary cylinder body, a pressure reducing rod is arranged in an inner cavity of the plunger, the pressure reducing rod is provided with a piston and a guide sleeve, and one end of the pressure reducing rod is provided with a threaded hole for fixing a screw.
The three-stage cylinder is characterized in that a three-stage cylinder opening guide sleeve assembly is arranged at one end inside the three-stage cylinder, a two-stage cylinder opening guide sleeve assembly is arranged at one end inside the two-stage cylinder, and a one-stage cylinder opening guide sleeve assembly is arranged at one end inside the one-stage cylinder.
Preferably, a lower cavity liquid inlet is formed in the lower end of the first-stage cylinder body and used for injecting high-pressure liquid.
Preferably, the upper end of the first-stage cylinder body is provided with an upper cavity liquid inlet, and the upper cavity liquid inlet is used for injecting high-pressure liquid.
Preferably, one end of the secondary cylinder body is provided with a bottom valve, and high-pressure liquid passes through a liquid through hole formed in the secondary cylinder body, so that the tertiary cylinder body descends to the lowest position.
Preferably, a boss capable of being communicated with liquid is arranged at the bottom of the secondary cylinder body, so that a bottom valve of the tertiary cylinder body is opened, and high-pressure liquid passes through a liquid communication hole formed in the tertiary cylinder body, and the plunger is lowered to a required height.
Preferably, a boss capable of being communicated with liquid is arranged on the bottom of the second-stage cylinder body, a bottom valve of the third-stage cylinder body is arranged in the middle, the pressure reducing rod is fixed on the bottom of the third-stage cylinder body, and a threaded hole of the pressure reducing rod is drilled through and is superior to a blind threaded hole.
Compared with the related art, the three telescopic columns with high pressure reduction and reliability provided by the invention have the following beneficial effects:
the invention provides a three-telescopic stand column capable of reducing pressure and having high reliability. High-pressure liquid is injected through a liquid inlet of a lower cavity of the first-stage cylinder body, so that the upright column rises to an effective height to achieve initial supporting force. When the top plate is pressed, the cross section of the lower cavity of the plunger, the pressure reducing rod, the piston and the cross section of the cavity below the plunger head simultaneously bear pressure, so that the pressure bearing area is increased, and the pressure of the three-stage cavity is reduced. High-pressure liquid is injected through a liquid inlet of the upper cavity of the one-level cylinder body, the secondary cylinder body descends, when the secondary cylinder body reaches the lowest position, a bottom valve of the secondary cylinder body is opened, the high-pressure liquid passes through a liquid through hole formed in the secondary cylinder body, the tertiary cylinder body descends, when the lowest position is reached, a boss capable of passing through liquid is arranged on the bottom of the secondary cylinder body, the bottom valve of the tertiary cylinder body is opened, the high-pressure liquid passes through the liquid through hole formed in the tertiary cylinder body, and the movable column descends to a required height.
a. A boss capable of being communicated with liquid is arranged at the bottom of the secondary cylinder body; b. the bottom valve of the third-stage cylinder body is arranged in the middle; c. a fixing screw is arranged on the bottom of the third-stage cylinder body, and the pressure reducing rod is fixed on the bottom of the third-stage cylinder body; d. the screw hole of the fixing screw is drilled through and is superior to the blind screw hole.
Drawings
FIG. 1 is a schematic structural view of a preferred embodiment of a depressible high reliability three-telescopic column provided in the present invention;
fig. 2 is a schematic plan view of the back structure shown in fig. 1.
Fig. 3 is a schematic view of the screw holes drilled through the set screws shown in fig. 1 and 2.
Reference numbers in the figures: 1. a primary cylinder body; 2. a secondary cylinder body; 3. a third-stage cylinder body; 4. a plunger; 5. a pressure reducing rod; 6. a piston; 7. a guide sleeve; 8. a set screw; 9. a secondary cylinder port guide sleeve assembly; 10. a tertiary cylinder port guide sleeve assembly; 11. the first-stage cylinder opening guide sleeve assembly.
Detailed Description
The invention is further described below with reference to the drawings and the embodiments.
Please refer to fig. 1 and fig. 2 in combination, wherein fig. 1 is a schematic structural diagram of a preferred embodiment of a three telescopic columns for reducing voltage and improving reliability according to the present invention; fig. 2 is a schematic plan view of the back structure shown in fig. 1. Three telescopic stand columns of degradable high reliability, including one-level cylinder body 1, 1 inside second grade cylinder body 2 that is provided with of one-level cylinder body, 2 inside tertiary cylinder bodies 3 that are provided with of second grade cylinder body, 3 inside pillars 4 that all are provided with of tertiary cylinder body, the inside depression bar 5 that is provided with of pillar 4, be provided with piston 6, uide bushing 7 between pillar 4 and the depression bar 5, 5 one end departments of depression bar are provided with set screw 8.
The three-stage cylinder body 3 is characterized in that a three-stage cylinder opening guide sleeve assembly 10 is arranged at one end inside the three-stage cylinder body 3, a two-stage cylinder opening guide sleeve assembly 9 is arranged at one end inside the two-stage cylinder body 2, and a one-stage cylinder opening guide sleeve assembly 11 is arranged at one end inside the one-stage cylinder body 1.
A lower cavity liquid inlet is formed in the lower end of the first-stage cylinder body 1 and is used for injecting high-pressure liquid.
An upper cavity liquid inlet is formed in the upper end of the first-stage cylinder body 1 and is used for injecting high-pressure liquid.
And a bottom valve is arranged at one end of the secondary cylinder body 2, and high-pressure liquid passes through a liquid through hole arranged in the secondary cylinder body 2, so that the tertiary cylinder body 3 descends to the lowest position.
The bottom of the secondary cylinder body 2 is provided with a boss which can be communicated with liquid, so that the bottom valve of the tertiary cylinder body 3 is opened, and high-pressure liquid passes through a liquid communication hole arranged in the tertiary cylinder body 3, so that the plunger 4 is descended to the required height.
The cylinder bottom of the second-stage cylinder body 2 is provided with a boss capable of being communicated with liquid, a bottom valve of the third-stage cylinder body 3 is arranged in the middle, the pressure reducing rod 5 is fixed on the cylinder bottom of the third-stage cylinder body 3, and a threaded hole of the fixing screw 8 is drilled through and is superior to a blind threaded hole.
High-pressure liquid is injected through a liquid inlet of a lower cavity of the first-stage cylinder body 1, so that the upright column rises to an effective height to achieve initial supporting force. When the top plate is pressed, the lower cavity section of the plunger 4, the pressure reducing rod 5, the piston 6 and the cavity section below the head of the plunger 4 bear pressure simultaneously, so that the pressure bearing area is increased, and the pressure of the three-stage cavity is reduced. Inject high-pressure liquid through 1 epicoele inlet of one-level cylinder body, 2 descends of second grade cylinder body, when to the extreme low position, 2 bottom valves of second grade cylinder body are opened, high-pressure liquid is through setting up the through liquid hole in second grade cylinder body 2, make tertiary cylinder body 3 descend, when to the extreme low position, through set up the boss that can lead to liquid on the cylinder bottom of second grade cylinder body 2, make the bottom valve of tertiary cylinder body 3 open, high-pressure liquid is through setting up the through liquid hole in tertiary cylinder body 3, make the loose column 4 descend to needs height.
a. A boss which can be filled with liquid is arranged at the bottom of the secondary cylinder body 2; b. the bottom valve of the third-stage cylinder body 3 is arranged in the middle; c. a fixing screw 8 is arranged on the bottom of the third-stage cylinder body 3, and the pressure reducing rod 5 is fixed on the bottom of the third-stage cylinder body 3; d. the threaded hole of the fixing screw 8 is drilled through and is superior to a blind threaded hole.
The invention provides reliable technical support for the implementation of the support of the hydraulic support with large expansion ratio for the exploitation of special coal seams, and has good economic value:
1. according to the invention, the boss capable of being communicated with liquid is arranged on the bottom of the secondary cylinder body 2, so that the bottom valve of the tertiary cylinder body 3 is arranged in the middle, and the manufacturing difficulty is reduced.
2. According to the invention, the fixing screw 8 is arranged on the bottom of the third-stage cylinder body 3, and the pressure reducing rod 5 is fixed on the bottom of the third-stage cylinder body 3, so that the high pressure in the third-stage cylinder can be reduced by 30%, and the reliability of the three telescopic upright columns is improved.
The working principle of the three telescopic stand columns with the high pressure reduction and reliability provided by the invention is as follows:
high-pressure liquid is injected through a liquid inlet of a lower cavity of the first-stage cylinder body 1, so that the upright column rises to an effective height to achieve initial supporting force. When the top plate is pressed, the lower cavity section of the plunger 4, the pressure reducing rod 5, the piston 6 and the cavity section below the head of the plunger 4 bear pressure simultaneously, so that the pressure bearing area is increased, and the pressure of the three-stage cavity is reduced. High-pressure liquid is injected through the liquid inlet of the upper cavity of the one-level cylinder body 1, the second-level cylinder body 2 descends, and when the lower extreme position is reached, the bottom valve of the second-level cylinder body 2 is opened, the high-pressure liquid passes through the liquid through hole formed in the second-level cylinder body 2, so that the third-level cylinder body 3 descends, and when the lower extreme position is reached, the boss capable of passing through the liquid is arranged on the bottom of the second-level cylinder body 2, so that the bottom valve of the third-level cylinder body 3 is opened, and the high-pressure liquid passes through the liquid through hole formed in the third-level cylinder body 3, so that the movable column 4 descends to the required height.
a. A boss which can be communicated with liquid is arranged at the bottom of the secondary cylinder body 2; b. the bottom valve of the third-stage cylinder 3 is arranged in the middle; c. a fixing screw is arranged on the bottom of the third-stage cylinder body 3, and the pressure reducing rod 5 is fixed on the bottom of the third-stage cylinder body 3; d. the threaded hole of the fixing screw 8 is drilled through and is superior to a blind threaded hole.
The invention provides reliable technical support for the implementation of the support of the hydraulic support with large expansion ratio for the exploitation of special coal seams, and has good economic value:
1. according to the invention, the boss capable of being filled with liquid is arranged on the bottom of the secondary cylinder body 2, so that the bottom valve of the tertiary cylinder body 3 is arranged in the middle, and the manufacturing difficulty is reduced.
2. According to the invention, the fixing screw 8 is arranged on the bottom of the third-stage cylinder body 3, and the pressure reducing rod 5 is fixed on the bottom of the third-stage cylinder body 3, so that the high pressure in the third-stage cylinder can be reduced by 30%, and the reliability of the three telescopic upright columns is improved.
Compared with the related art, the three telescopic columns with high pressure reduction and reliability provided by the invention have the following beneficial effects:
1. according to the invention, the boss capable of being communicated with liquid is arranged on the bottom of the secondary cylinder body 2, so that the bottom valve of the tertiary cylinder body 3 is arranged in the middle, and the manufacturing difficulty is reduced.
2. According to the invention, the fixing screw 8 is arranged on the bottom of the third-stage cylinder body 3, and the pressure reducing rod 5 is fixed on the bottom of the third-stage cylinder body 3, so that the high pressure in the third-stage cylinder can be reduced by 30%, and the reliability of the three telescopic upright columns is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The utility model provides a three flexible stands of degradable high reliability, includes one-level cylinder body (1), its characterized in that: the improved cylinder is characterized in that a second-stage cylinder body (2) is arranged inside the first-stage cylinder body (1), a third-stage cylinder body (3) is arranged inside the second-stage cylinder body (2), a plunger (4) is arranged inside the third-stage cylinder body (3), a pressure reducing rod (5) is arranged inside the plunger (4), a piston (6) and a guide sleeve (7) are arranged between the plunger (4) and the pressure reducing rod (5), and a fixing screw (8) and the third-stage cylinder body (3) are fixedly connected to one end of the pressure reducing rod (5).
The novel cylinder is characterized in that a third-stage cylinder opening guide sleeve assembly (10) is arranged at one end inside the third-stage cylinder body (3), a second-stage cylinder opening guide sleeve assembly (9) is arranged at one end inside the second-stage cylinder body (2), and a first-stage cylinder opening guide sleeve assembly (11) is arranged at one end inside the first-stage cylinder body (1).
2. The three telescopic columns capable of reducing pressure and achieving high reliability as claimed in claim 1, wherein a lower cavity liquid inlet is formed at the lower end of the first-stage cylinder body (1) and is used for injecting high-pressure liquid.
3. The three telescopic columns of claim 1, wherein the upper end of the first-stage cylinder (1) is provided with an upper cavity liquid inlet for injecting high-pressure liquid.
4. The three telescopic columns of claim 1, characterized in that the secondary cylinder (2) is provided with a bottom valve at one end, and the high pressure liquid passes through a liquid through hole in the secondary cylinder (2) to lower the tertiary cylinder (3) to the lowest position.
5. The three telescopic columns with the pressure reduction and the high reliability according to claim 1 are characterized in that a boss capable of being communicated with liquid is arranged on the bottom of the secondary cylinder body (2), so that a bottom valve of the tertiary cylinder body (3) is opened, and high-pressure liquid passes through a liquid communication hole arranged in the tertiary cylinder body (3), so that the plunger (4) is lowered to a required height.
6. The pressure-reducing high-reliability three-telescopic upright post according to claim 1, characterized in that a boss capable of being communicated with liquid is arranged on the bottom of the secondary cylinder body (2), a bottom valve of the tertiary cylinder body (3) is arranged in the center, the pressure-reducing rod (5) is fixed on the bottom of the tertiary cylinder body (3), and a threaded hole of the fixing screw (8) is drilled through and is superior to a blind threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992462.0A CN115163144A (en) | 2022-08-18 | 2022-08-18 | Three flexible stands of degradable high reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992462.0A CN115163144A (en) | 2022-08-18 | 2022-08-18 | Three flexible stands of degradable high reliability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115163144A true CN115163144A (en) | 2022-10-11 |
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ID=83481855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210992462.0A Pending CN115163144A (en) | 2022-08-18 | 2022-08-18 | Three flexible stands of degradable high reliability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115163144A (en) |
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2022
- 2022-08-18 CN CN202210992462.0A patent/CN115163144A/en active Pending
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