A super-long and super-large cylinder diameter hydraulic support cylinder

Abstract

An extra-long and extra-large cylinder diameter hydraulic support oil cylinder comprises an outer cylinder body, a secondary cylinder body, a piston, a primary guide sleeve, a secondary guide sleeve, a bottom valve assembly and a control valve seat, wherein the inner wall of the cylinder mouth of the outer cylinder body is provided with an internal thread section and an internal static sealing surface section from the inside to the outside, and the length of the internal static sealing surface section is greater than the length of the internal thread section; the outer circle of the primary guide sleeve is provided with an external thread section and an external static sealing surface section from the bottom end to the top end, the external thread section is threadedly matched with the internal thread section, the external static sealing surface section is in close contact with the internal static sealing surface section, the length of the external static sealing surface section is greater than the length of the external thread section, the length of the internal static sealing surface section is greater than the length of the external thread section and the difference between the two is greater than 10 mm, and a static sealing groove is provided along the circumference of the outer circumference of the external static sealing surface section, and the distance between the static sealing groove and the bottom end face of the primary guide sleeve is greater than the length of the internal static sealing surface section. The present invention effectively avoids thread grinding, static seal matching surface grinding and static seal extrusion during oil cylinder assembly, and ensures assembly quality.

Description

Technical Field

[0001] The invention relates to the technical field of large mining height hydraulic supports, in particular to an extra-long and extra-large cylinder diameter hydraulic support oil cylinder. Background Art

[0002] In order to improve the quality and efficiency of coal mining, large mining height hydraulic supports have been rapidly applied in recent years. Therefore, the matching super-long and super-large cylinder hydraulic support cylinders have been rapidly applied in large mining height hydraulic supports.

[0003] Extra-long and extra-large cylinder diameter hydraulic support cylinder refers to a multi-stage cylinder with an inner diameter greater than 500mm and a closed length greater than 2m. The conventional cylinder structure includes: an outer cylinder, a secondary cylinder body, a piston, a guide sleeve, a bottom valve and a seal. The guide sleeve is connected to the cylinder body (outer cylinder and secondary cylinder body) by threads, which plays a role in supporting and guiding the secondary cylinder body and the piston in the cylinder, and also plays a role in sealing the liquid in the upper chamber of the cylinder. During the assembly of the cylinder, the threads, static sealing surfaces, static seals and inner recesses at the cylinder mouth are prone to grinding and damage. The extra-long and extra-large cylinder diameter hydraulic support cylinder is affected by the length and diameter of the components, and the above assembly quality problems are more serious.

[0004] According to the existing technology, when assembling the extra-long and extra-large cylinder diameter hydraulic support cylinder, the following problems need to be solved: (1) the rectangular threads of the guide sleeve and the cylinder body are easy to be scratched; (2) the matching surface of the guide sleeve and the cylinder body static seal is easy to be scratched; (3) the static seal of the guide sleeve is easy to be squeezed. Therefore, it is necessary to study the structure of the conventional extra-long and extra-large cylinder diameter hydraulic support cylinder.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0006] The purpose of the present invention is to address the deficiencies in the prior art and thereby provide an extra-long and extra-large cylinder diameter hydraulic support cylinder. The present invention has a scientific design and a reasonable structure and can effectively avoid the grinding of the rectangular threads of the guide sleeve and the cylinder body, the grinding of the matching surfaces of the guide sleeve and the cylinder body, and the squeezing of the static seal of the guide sleeve during the assembly of the cylinder, thereby ensuring the assembly quality.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: an extra-long and extra-large cylinder diameter hydraulic support cylinder, comprising an outer cylinder body, a secondary cylinder body, a piston, a primary guide sleeve, a secondary guide sleeve, a bottom valve assembly and a control valve seat, the secondary cylinder body is coaxially plugged and assembled in the outer cylinder body, the piston is coaxially plugged and assembled in the secondary cylinder body, the primary guide sleeve is installed in the cylinder mouth of the outer cylinder body and sleeved on the outer circumference of the secondary cylinder body, the primary guide sleeve is used to support and guide the secondary cylinder body, the secondary guide sleeve is installed in the cylinder mouth of the secondary cylinder body and sleeved on the outer circumference of the piston, the secondary guide sleeve is used to support and guide the piston, the bottom valve assembly is installed at the bottom end of the secondary cylinder body, the control valve seat is installed on the outside of the outer cylinder body, the cylinder mouth structures of the outer cylinder body and the secondary cylinder body are the same, and the inner wall of the cylinder mouth of the outer cylinder body is provided with an internal thread section and an internal static sealing surface section from the inside to the outside. The inner diameter of the internal thread section is smaller than the inner diameter of the internal static sealing surface section, and the length of the internal static sealing surface section is greater than the length of the internal thread section; the structures of the first-level guide sleeve and the second-level guide sleeve are the same, the top outer circle of the first-level guide sleeve is provided with a flange for connecting with the cylinder mouth end of the outer cylinder body, the outer circle of the first-level guide sleeve is provided with an external thread section and an external static sealing surface section from the bottom end to the top end, the outer diameter of the external thread section is smaller than the outer diameter of the external static sealing surface section, the external thread section is threadedly matched with the internal thread section, the external static sealing surface section is in close contact with the internal static sealing surface section, the length of the external static sealing surface section is greater than the length of the external thread section, the length of the internal static sealing surface section is greater than the length of the external thread section and the difference between the two is greater than 10mm, a static sealing groove is provided along the circumferential direction of the outer circumference of the external static sealing surface section, and the distance between the static sealing groove and the bottom end face of the first-level guide sleeve is greater than the length of the internal static sealing surface section.

[0008] Based on the above, an annular groove for installing a sealing ring is circumferentially provided on the outer circle of the top end of the outer static sealing surface segment, and a chamfer is provided between the bottom end of the outer static sealing surface segment and the top end of the external thread segment.

[0009] Based on the above, the extra-long and extra-large cylinder diameter hydraulic support cylinder also includes three or more levels of cylinder bodies and guide sleeves. The assembly relationship between the cylinder bodies of two adjacent levels is the same as the assembly relationship between the outer cylinder body and the second-level cylinder body, and the assembly relationship between the cylinder body and the guide sleeve of each level is the same as the assembly relationship between the outer cylinder body and the first-level guide sleeve.

[0010] An assembly method for an extra-long and extra-large cylinder diameter hydraulic support cylinder specifically comprises the following steps:

[0011] (1) Drop the piston into the bottom of the secondary cylinder;

[0012] (2) Identify the buckle between the external thread section of the secondary guide sleeve and the internal thread section of the secondary cylinder;

[0013] (3) Raise the plunger to a certain height again;

[0014] (4) Tighten the secondary guide sleeve clockwise according to the required torque;

[0015] (5) Drop the secondary cylinder into the bottom of the outer cylinder;

[0016] (6) Using the method of step (2), identify the buckle between the external thread section of the primary guide sleeve and the internal thread section of the outer cylinder body;

[0017] (7) Raise the secondary cylinder to a certain height again;

[0018] (8) Tighten the first-stage guide sleeve clockwise according to the required torque;

[0019] (9) Drop the secondary cylinder body to complete the assembly of the extra-long and extra-large cylinder diameter hydraulic support cylinder.

[0020] Based on the above, step (1) is specifically as follows: vertically drop the piston into the secondary cylinder body. During the drop, the inner hole of the secondary cylinder body is connected to the outside air by controlling the opening of the bottom valve assembly. The piston falls to the bottom of the secondary cylinder body, so that the bottom end of the piston is completely in contact with the bottom end of the inner hole of the secondary cylinder body. At this time, the inner hole of the secondary cylinder body limits the circumferential part of the piston of the piston, and the inner socket of the cylinder bottom of the secondary cylinder body limits the bottom of the piston of the piston.

[0021] Based on the above, step (2) is specifically as follows: mark the position of the thread buckle head of the external thread section of the secondary guide sleeve at its top end face, and mark the position of the thread buckle head of the internal thread section of the secondary cylinder body at its cylinder mouth end face; then, put the secondary guide sleeve on the piston and put the bottom end of the secondary guide sleeve into the cylinder mouth of the secondary cylinder body; before screwing the secondary guide sleeve, ensure that the thread buckle head of the external thread section of the secondary guide sleeve is 30-50mm counterclockwise from the thread buckle head of the internal thread section of the secondary cylinder body; press the secondary guide sleeve so that the external thread section of the secondary guide sleeve contacts the internal thread section of the secondary cylinder body; at this time, the external static sealing surface section of the secondary guide sleeve and the internal static sealing surface section of the secondary cylinder body are first fitted and contacted to form a matching relationship; use the fitting contact point between the external static sealing surface section of the secondary guide sleeve and the internal static sealing surface section of the secondary cylinder body as the positioning reference; screw the secondary guide sleeve clockwise for one turn so that the thread buckle head of the external thread section of the secondary guide sleeve rotates into the thread buckle head of the internal thread section of the secondary cylinder body.

[0022] Based on the above, step (3) is specifically as follows: by controlling the opening of the bottom valve assembly, the inner hole of the secondary cylinder body is connected to the outside air, the piston is pulled up again, so that the bottom end of the piston and the bottom end of the inner hole of the secondary cylinder body are kept within a range of 100-200 mm, and then the bottom valve assembly is closed.

[0023] Based on the above, step (5) is specifically as follows: vertically drop the secondary cylinder into the outer cylinder. During the drop, the inner hole of the outer cylinder is connected to the outside air by controlling the opening of the control valve seat. The secondary cylinder falls to the bottom of the outer cylinder so that the bottom end of the secondary cylinder is completely in contact with the bottom end of the inner hole of the outer cylinder. At this time, the inner hole of the outer cylinder limits the lower circumference of the secondary cylinder. At the same time, the inner recess of the bottom of the outer cylinder limits the bottom end of the secondary cylinder.

[0024] Based on the above, step (6) is specifically as follows: mark the position of the threaded buckle head of the external threaded section of the first-level guide sleeve at its top end face, and mark the position of the threaded buckle head of the internal threaded section of the outer cylinder body at its cylinder mouth end face; then, put the first-level guide sleeve on the second-level cylinder body and put the bottom end of the first-level guide sleeve into the cylinder mouth of the outer cylinder body; before screwing the first-level guide sleeve, ensure that the threaded buckle head of the external threaded section of the first-level guide sleeve is 30-50mm counterclockwise from the threaded buckle head of the internal threaded section of the outer cylinder body; press the first-level guide sleeve so that the external threaded section of the first-level guide sleeve contacts the internal threaded section of the outer cylinder body; at this time, the external static sealing surface section of the first-level guide sleeve and the internal static sealing surface section of the outer cylinder body are first fitted and contacted to form a matching relationship; the fitting contact point between the external static sealing surface section of the first-level guide sleeve and the internal static sealing surface section of the outer cylinder body is used as a positioning reference; screw the first-level guide sleeve clockwise by one turn so that the threaded buckle head of the external threaded section of the first-level guide sleeve rotates into the threaded buckle head of the internal threaded section of the outer cylinder body.

[0025] Based on the above, step (7) is specifically as follows: by controlling the opening of the control valve seat, the inner hole of the outer cylinder body is connected to the outside air, the secondary cylinder body is pulled up again, so that the bottom end of the secondary cylinder body and the bottom end of the inner hole of the outer cylinder body are kept at a distance within the range of 100-200 mm, and then the control valve seat is closed.

[0026] Based on the above, step (9) is specifically as follows: by controlling the opening of the control valve seat, the inner hole of the outer cylinder body is connected to the outside air, and the secondary cylinder body is dropped to the bottom of the outer cylinder body, thereby completing the assembly of the extra-long and extra-large cylinder diameter hydraulic support cylinder.

[0027] The present invention has outstanding substantive features and significant progress compared to the prior art. Specifically, the beneficial effects of the present invention are:

[0028] 1. The present invention provides an extra-long and extra-large cylinder diameter hydraulic support oil cylinder, and improves the structure of the cylinder port and the guide sleeve of each cylinder body. When assembling the secondary guide sleeve, since the length of the inner static sealing surface section of the secondary cylinder body is greater than the length of the inner thread section of the secondary cylinder body, the length of the outer static sealing surface section of the secondary guide sleeve is greater than the length of the outer thread section of the secondary guide sleeve, and the length of the inner static sealing surface section of the secondary cylinder body is greater than the length of the outer thread section of the secondary guide sleeve, and the difference between the two is greater than 10mm, it can be ensured that before the secondary guide sleeve is screwed, the outer static sealing surface section of the secondary guide sleeve and the inner static sealing surface section of the secondary cylinder body are first fitted and contacted to form a matching relationship, and the outer static sealing surface section of the secondary guide sleeve and the inner static sealing surface section of the secondary cylinder body are fitted and contacted to form a matching relationship. As the positioning reference, it can ensure that the secondary guide sleeve is coaxial with the secondary cylinder body during the tightening process, avoiding grinding damage to the external thread section of the secondary guide sleeve and the internal thread section of the secondary cylinder body and squeezing damage to the static seal. When the external thread section of the secondary guide sleeve and the internal thread section of the secondary cylinder body are buckled, the friction force is small during the first buckle of the secondary guide sleeve, and the secondary guide sleeve cannot drive the bottom of the piston and the bottom of the secondary cylinder body to rotate relative to each other, and the inner nest of the bottom of the secondary cylinder body will not be grinded. At the same time, the static sealing groove on the secondary guide sleeve is farther away from the bottom end face of the secondary guide sleeve than the length of the inner static sealing surface section of the secondary cylinder body. The assembly process of the secondary guide sleeve is convenient for observing the static seal assembly quality and adjusting the equipment parameters in time. When assembling the first guide sleeve, the same as the assembly of the second guide sleeve is applied, which will not be repeated.

[0029] 2. The present invention provides an assembly method for an oil cylinder of an ultra-long and ultra-large cylinder diameter hydraulic support. When the external threaded section of the secondary guide sleeve and the internal threaded section of the secondary cylinder are buckled, before the secondary guide sleeve is screwed, the bottom valve assembly is controlled to be opened, so that the piston falls to the cylinder bottom of the secondary cylinder body, so that the bottom end of the piston is completely in contact with the bottom end of the inner hole of the secondary cylinder body. At this time, the inner hole of the secondary cylinder body limits the circumferential part of the piston of the piston, and the inner socket of the cylinder bottom of the secondary cylinder body limits the bottom of the piston of the piston, so as to prevent the piston from swinging with the secondary guide sleeve when the secondary guide sleeve is buckled, causing the inner static sealing surface section of the secondary cylinder body and the outer static sealing surface section of the secondary guide sleeve to be damaged; When the external thread section of the first-level guide sleeve and the internal thread section of the outer cylinder are buckled, the buckle is the same as that of the external thread section of the second-level guide sleeve and the internal thread section of the second-level cylinder, that is, before tightening the first-level guide sleeve, by controlling the opening of the control valve seat, the second-level cylinder body is dropped to the bottom of the outer cylinder body, so that the bottom end of the second-level cylinder body is completely in contact with the bottom end of the inner hole of the outer cylinder body. At this time, the inner hole of the outer cylinder body limits the lower circumference of the second-level cylinder body. At the same time, the inner nest of the cylinder bottom of the outer cylinder body limits the bottom end of the second-level cylinder body to prevent the second-level cylinder body from swinging with the first-level guide sleeve when the first-level guide sleeve is buckled, causing scratches on the inner static sealing surface section of the outer cylinder body and the outer static sealing surface section of the first-level guide sleeve.

[0030] 3. When tightening the secondary guide sleeve buckle head, mark the position of the thread buckle head of the external thread section of the secondary guide sleeve at its top end face in advance, and mark the position of the thread buckle head of the internal thread section of the secondary cylinder body at its cylinder mouth end face. Then, put the secondary guide sleeve on the piston and put the bottom end of the secondary guide sleeve into the cylinder mouth of the secondary cylinder body. Before tightening the secondary guide sleeve, ensure that the thread buckle head of the external thread section of the secondary guide sleeve is 30-50mm counterclockwise from the thread buckle head of the internal thread section of the secondary cylinder body. When tightening the secondary guide sleeve, you can directly tighten the assembly clockwise to avoid the first buckle damage of the rectangular thread caused by the contact between the external thread section of the secondary guide sleeve and the internal thread section of the secondary cylinder body when the secondary guide sleeve rotates counterclockwise to identify the buckle head; when tightening the first guide sleeve buckle head, proceed in the same way as above to avoid the first buckle damage of the rectangular thread caused by the contact between the external thread section of the first guide sleeve and the internal thread section of the outer cylinder body when the first guide sleeve rotates counterclockwise to identify the buckle head.

[0031] In summary, the present invention has a scientific design and a reasonable structure, and can effectively avoid the grinding of the rectangular threads of the guide sleeve and the cylinder body, the grinding of the matching surfaces of the guide sleeve and the static seal of the cylinder body, and the squeezing of the static seal of the guide sleeve during the assembly of the oil cylinder, thereby ensuring the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the super-long and super-large cylinder diameter hydraulic support cylinder of the present invention.

[0033] Figure 2 The utility model is a schematic diagram of the assembly structure of the super-long and super-large cylinder diameter hydraulic support oil cylinder before screwing the first-stage guide sleeve of the present invention.

[0034] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0035] Figure 4 It is a structural schematic diagram of a primary guide sleeve of the present invention.

[0036] Figure 5 It is a schematic diagram of the cylinder mouth structure of the outer cylinder body of the present invention.

[0037] In the figure: 1. outer cylinder body; 2. secondary cylinder body; 3. piston; 4. primary guide sleeve; 5. secondary guide sleeve; 6. bottom valve assembly; 7. control valve seat; 8. internal thread section; 9. internal static sealing surface section; 10. flange; 11. external thread section; 12. external static sealing surface section; 13. static sealing groove; 14. ring groove; 15. chamfer. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0039] like Figure 1-5As shown, an extra-long and extra-large cylinder diameter hydraulic support cylinder comprises an outer cylinder body 1, a secondary cylinder body 2, a piston 3, a primary guide sleeve 4, a secondary guide sleeve 5, a bottom valve assembly 6 and a control valve seat 7. The secondary cylinder body 2 is coaxially plugged and assembled in the outer cylinder body 1, the piston 3 is coaxially plugged and assembled in the secondary cylinder body 2, the primary guide sleeve 4 is installed in the cylinder mouth of the outer cylinder body 1 and sleeved on the outer circumference of the secondary cylinder body 2, the primary guide sleeve 4 is used to support and guide the secondary cylinder body 2, the secondary guide sleeve 5 is installed in the cylinder mouth of the secondary cylinder body 2 and sleeved on the outer circumference of the piston 3, the secondary guide sleeve 5 is used to support and guide the piston 3, the bottom valve assembly 6 is installed at the bottom end of the secondary cylinder body 2, the control valve seat 7 is installed on the outside of the outer cylinder body 1, the cylinder mouth structures of the outer cylinder body 1 and the secondary cylinder body 2 are the same, and the inner wall of the cylinder mouth of the outer cylinder body 1 is provided with an internal thread section 8 and an internal static sealing surface section 9 from the inside to the outside, and the inner diameter of the internal thread section 8 is smaller than the inner diameter of the internal static sealing surface section 9. , the length L1 of the inner static sealing surface section 9 is greater than the length L2 of the inner thread section 8; the first-level guide sleeve 4 and the second-level guide sleeve 5 have the same structure, the top outer circle of the first-level guide sleeve 4 is provided with a flange 10 for connecting with the cylinder mouth end of the outer cylinder body 1, the outer circle of the first-level guide sleeve 4 is provided with an external thread section 11 and an external static sealing surface section 12 from the bottom end to the top end, the outer diameter of the external thread section 11 is smaller than the outer diameter of the external static sealing surface section 12, the external thread section 11 is threadedly matched with the internal thread section 8, the external static sealing surface section 12 is in close contact with the internal static sealing surface section 9, the length L3 of the external static sealing surface section 12 is greater than the length L4 of the external thread section 11, the length L1 of the internal static sealing surface section 9 is greater than the length L4 of the external thread section 11, and the difference between the two is greater than 10mm, and a static sealing groove is opened along the circumferential direction of the outer circumference of the external static sealing surface section 12, and the distance L5 between the static sealing groove and the bottom end face of the first-level guide sleeve 4 is greater than the length L1 of the inner static sealing surface section 9. It should be noted that: the structure and size of the outer cylinder body 1 correspond to the first-level guide sleeve 4, and the structure and size of the second-level cylinder body 2 correspond to the second-level guide sleeve 5, that is, the external thread section 11 of the first-level guide sleeve 4 is threadedly matched with the internal thread section 8 of the outer cylinder body 1, the external static sealing surface section 12 of the first-level guide sleeve 4 is in close contact with the internal static sealing surface section 9 of the outer cylinder body 1, and the length L1 of the internal static sealing surface section 9 of the outer cylinder body 1 is greater than the length L4 of the external thread section 11 of the first-level guide sleeve 4, and the difference between the two is greater than 10 mm; the external thread section 11 of the second-level guide sleeve 5 is threadedly matched with the internal thread section 8 of the second-level cylinder body 2, the external static sealing surface section 12 of the second-level guide sleeve 5 is in close contact with the internal static sealing surface section 9 of the second-level cylinder body 2, and the length L1 of the internal static sealing surface section 9 of the second-level cylinder body 2 is greater than the length L4 of the external thread section 11 of the second-level guide sleeve 5, and the difference between the two is greater than 10 mm.

[0040] An annular groove for installing a sealing ring is circumferentially formed on the outer circle of the top end of the outer static sealing surface section 12 , and a chamfer is provided between the bottom end of the outer static sealing surface section 12 and the top end of the external thread section 11 .

[0041] An assembly method for an extra-long and extra-large cylinder diameter hydraulic support cylinder specifically comprises the following steps:

[0042] (1) The piston 3 is dropped vertically into the secondary cylinder 2. During the dropping process, the inner hole of the secondary cylinder 2 is connected to the outside air by controlling the opening of the bottom valve assembly 6. The piston 3 drops to the bottom of the secondary cylinder 2, so that the bottom end of the piston 3 is completely in contact with the bottom end of the inner hole of the secondary cylinder 2. At this time, the inner hole of the secondary cylinder 2 limits the circumferential part of the piston of the piston 3. At the same time, the inner socket of the cylinder bottom of the secondary cylinder 2 limits the bottom of the piston of the piston 3, which can prevent the piston 3 from swinging with the secondary guide sleeve 5 when the secondary guide sleeve 5 is screwed on, causing the inner static sealing surface section 9 of the secondary cylinder 2 and the outer static sealing surface section 12 of the secondary guide sleeve 5 to be scratched;

[0043] (2) Mark the position of the thread buckle head of the external thread section 11 of the secondary guide sleeve 5 on its top end surface, and mark the position of the thread buckle head of the internal thread section 8 of the secondary cylinder body 2 on its cylinder mouth end surface. Then, put the secondary guide sleeve 5 on the piston 3 and put the bottom end of the secondary guide sleeve 5 into the cylinder mouth of the secondary cylinder body 2. Before tightening the secondary guide sleeve 5, make sure that the thread buckle head of the external thread section 11 of the secondary guide sleeve 5 is 30-50mm counterclockwise from the thread buckle head of the internal thread section 8 of the secondary cylinder body 2. Then tighten the secondary guide sleeve 5. The guide sleeve 5 can be directly tightened and assembled clockwise, avoiding the rectangular thread first buckle damage caused by the contact between the external thread section 11 of the secondary guide sleeve 5 and the internal thread section 8 of the secondary cylinder body 2 when the secondary guide sleeve 5 is rotated counterclockwise to recognize the buckle head; the secondary guide sleeve 5 is pressed to make the external thread section 11 of the secondary guide sleeve 5 contact with the internal thread section 8 of the secondary cylinder body 2. Since the length L1 of the internal static sealing surface section 9 of the secondary cylinder body 2 is greater than the length L2 of the internal thread section 8 of the secondary cylinder body 2, the external static sealing surface section 12 of the secondary guide sleeve 5 The length L3 is greater than the length L4 of the external thread section 11 of the secondary guide sleeve 5, and the length L1 of the internal static sealing surface section 9 of the secondary cylinder body 2 is greater than the length L4 of the external thread section 11 of the secondary guide sleeve 5, and the difference between the two is greater than 10 mm. Therefore, at this time, the external static sealing surface section 12 of the secondary guide sleeve 5 and the internal static sealing surface section 9 of the secondary cylinder body 2 are first fitted and contacted to form a matching relationship, and the fitting contact point between the external static sealing surface section 12 of the secondary guide sleeve 5 and the internal static sealing surface section 9 of the secondary cylinder body 2 is used as the positioning reference to ensure that the secondary During the tightening process of the guide sleeve 5, it is coaxial with the secondary cylinder body 2, avoiding grinding damage to the external thread section 11 of the secondary guide sleeve 5 and the internal thread section 8 of the secondary cylinder body 2 and squeezing damage to the static seal. The secondary guide sleeve 5 is screwed clockwise for one buckle, so that the thread buckle head of the external thread section 11 of the secondary guide sleeve 5 rotates into the thread buckle head of the internal thread section 8 of the secondary cylinder body 2. In the first buckle process of screwing the secondary guide sleeve 5, the friction force is small, the secondary guide sleeve 5 cannot drive the bottom of the piston 3 and the bottom of the secondary cylinder body 2 to rotate relative to each other, and the inner socket of the cylinder bottom of the secondary cylinder body 2 will not be grinded;

[0044] (3) By controlling the opening of the bottom valve assembly 6, the inner hole of the secondary cylinder body 2 is connected to the outside air, the piston 3 is pulled up again, so that the bottom end of the piston 3 and the bottom end of the inner hole of the secondary cylinder body 2 are kept within a range of 100-200 mm, and then the bottom valve assembly 6 is closed;

[0045] (4) Tighten the secondary guide sleeve 5 clockwise according to the required torque. Since the distance L5 between the static seal groove on the secondary guide sleeve 5 and the bottom end surface of the secondary guide sleeve 5 is greater than the length L1 of the inner static seal surface section 9 of the secondary cylinder body 2, the assembly process of the secondary guide sleeve 5 is convenient for observing the static seal assembly quality and adjusting the equipment parameters in time;

[0046] (5) The secondary cylinder body 2 is dropped vertically into the outer cylinder body 1. During the dropping process, the inner hole of the outer cylinder body 1 is connected to the outside air by controlling the opening of the control valve seat 7. The secondary cylinder body 2 drops to the bottom of the outer cylinder body 1, so that the bottom end of the secondary cylinder body 2 is completely in contact with the bottom end of the inner hole of the outer cylinder body 1. At this time, the inner hole of the outer cylinder body 1 limits the lower circumference of the secondary cylinder body 2. At the same time, the inner socket of the cylinder bottom of the outer cylinder body 1 limits the bottom end of the secondary cylinder body 2 to prevent the secondary cylinder body 2 from swinging with the primary guide sleeve 4 when the primary guide sleeve 4 is screwed on, causing the inner static sealing surface section 9 of the outer cylinder body 1 and the outer static sealing surface section 12 of the primary guide sleeve 4 to be scratched;

[0047] (6) Mark the position of the thread buckle head of the external thread segment 11 of the first-level guide sleeve 4 on its top end surface, and mark the position of the thread buckle head of the internal thread segment 8 of the outer cylinder body 1 on its cylinder mouth end surface. Then, put the first-level guide sleeve 4 on the second-level cylinder body 2 and put the bottom end of the first-level guide sleeve 4 into the cylinder mouth of the outer cylinder body 1. Before tightening the first-level guide sleeve 4, make sure that the thread buckle head of the external thread segment 11 of the first-level guide sleeve 4 is 30-50mm counterclockwise from the thread buckle head of the internal thread segment 8 of the outer cylinder body 1, and then tighten it. The first-level guide sleeve 4 can be directly tightened and assembled clockwise, avoiding the first buckle of the rectangular thread being damaged by the contact between the external thread section 11 of the first-level guide sleeve 4 and the internal thread section 8 of the outer cylinder body 1 when the first-level guide sleeve 4 is rotated counterclockwise to identify the buckle head; the first-level guide sleeve 4 is pressed to make the external thread section 11 of the first-level guide sleeve 4 contact with the internal thread section 8 of the outer cylinder body 1. Since the length L1 of the inner static sealing surface section 9 of the outer cylinder body 1 is greater than the length L2 of the internal thread section 8 of the outer cylinder body 1, the external static sealing surface section 12 of the first-level guide sleeve 4 The length L3 of the first-stage guide sleeve 4 is greater than the length L4 of the external thread section 11, and the length L1 of the internal static sealing surface section 9 of the outer cylinder body 1 is greater than the length L4 of the external thread section 11 of the first-stage guide sleeve 4, and the difference between the two is greater than 10mm. Therefore, at this time, the external static sealing surface section 12 of the first-stage guide sleeve 4 and the internal static sealing surface section 9 of the outer cylinder body 1 are first fitted and contacted to form a matching relationship, and the fitting contact point between the external static sealing surface section 12 of the first-stage guide sleeve 4 and the internal static sealing surface section 9 of the outer cylinder body 1 is used as the positioning reference to ensure that the first-stage During the tightening process of the guide sleeve 4, it is coaxial with the outer cylinder body 1, which avoids grinding damage to the external thread section 11 of the first-level guide sleeve 4 and the internal thread section 8 of the outer cylinder body 1 and squeezing damage to the static seal. The first-level guide sleeve 4 is screwed clockwise for one buckle, so that the thread buckle head of the external thread section 11 of the first-level guide sleeve 4 rotates into the thread buckle head of the internal thread section 8 of the outer cylinder body 1. In the first buckle process of screwing the first-level guide sleeve 4, the friction force is small, and the first-level guide sleeve 4 cannot drive the bottom of the second-level cylinder body 2 and the bottom of the outer cylinder body 1 to rotate relative to each other, and the inner nest of the cylinder bottom of the outer cylinder body 1 will not be grinded;

[0048] (7) By controlling the opening of the control valve seat 7, the inner hole of the outer cylinder body 1 is connected to the outside air, and the secondary cylinder body 2 is pulled up again, so that the bottom end of the secondary cylinder body 2 and the bottom end of the inner hole of the outer cylinder body 1 are kept within a range of 100-200mm, and then the control valve seat 7 is closed;

[0049] (8) Tighten the first-stage guide sleeve 4 clockwise according to the required torque. Since the distance L5 between the static seal groove on the first-stage guide sleeve 4 and the bottom end face of the first-stage guide sleeve 4 is greater than the length L1 of the inner static seal surface section 9 of the outer cylinder body 1, the process of assembling the first-stage guide sleeve 4 is convenient for observing the static seal assembly quality and adjusting the equipment parameters in time;

[0050] (9) By controlling the opening of the control valve seat 7, the inner hole of the outer cylinder body 1 is connected to the outside air, and the secondary cylinder body 2 falls to the bottom of the outer cylinder body 1, completing the assembly of the extra-long and extra-large cylinder diameter hydraulic support cylinder.

[0051] The bottom valve assembly 6 and the control valve seat 7 are conventional technologies, and the specific structure and working principle are not described in detail. The thread buckle head refers to the starting head of the thread.

[0052] It should be noted that the extra-long and extra-large cylinder diameter hydraulic support cylinder in the present embodiment is a double telescopic cylinder. The extra-long and extra-large cylinder diameter hydraulic support cylinder can also be a multi-stage telescopic cylinder of three levels or more. The cylinder mouth structure of each stage of the cylinder body is the same as the cylinder mouth structure of the outer cylinder body 1 in the present embodiment, and the guide sleeve structure in each stage of the cylinder body is the same as the structure of the first-stage guide sleeve 4 in the present embodiment. The assembly relationship between the cylinder bodies of two adjacent stages is the same as the assembly relationship between the outer cylinder body and the second-stage cylinder body, and the assembly relationship between the cylinder body and the guide sleeve of each stage is the same as the assembly relationship between the outer cylinder body and the first-stage guide sleeve; the assembly method of the extra-long and extra-large cylinder diameter hydraulic support cylinder in the present embodiment can also be used to assemble a multi-stage telescopic cylinder of three levels or more or an ordinary multi-stage cylinder.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An extra-long and extra-large cylinder diameter hydraulic support oil cylinder, comprising an outer cylinder body, a secondary cylinder body, a piston, a primary guide sleeve, a secondary guide sleeve, a bottom valve assembly and a control valve seat, wherein the secondary cylinder body is coaxially plugged and assembled in the outer cylinder body, the piston is coaxially plugged and assembled in the secondary cylinder body, the primary guide sleeve is installed in the cylinder port of the outer cylinder body and sleeved on the outer circumference of the secondary cylinder body, the primary guide sleeve is used to support and guide the secondary cylinder body, the secondary guide sleeve is installed in the cylinder port of the secondary cylinder body and sleeved on the outer circumference of the piston, the secondary guide sleeve is used to support and guide the piston, the bottom valve assembly is installed at the bottom end of the secondary cylinder body, and the control valve seat is installed on the outside of the outer cylinder body, characterized in that: The outer cylinder body and the secondary cylinder body have the same cylinder mouth structure, the inner wall of the cylinder mouth of the outer cylinder body is provided with an internal thread section and an internal static sealing surface section from the inside to the outside, the inner diameter of the internal thread section is smaller than the inner diameter of the internal static sealing surface section, and the length of the internal static sealing surface section is greater than the length of the internal thread section; the first-level guide sleeve and the second-level guide sleeve have the same structure, the top outer circle of the first-level guide sleeve is provided with a flange for connecting with the cylinder mouth end of the outer cylinder body, the outer circle of the first-level guide sleeve is provided with an external thread section and an external static sealing surface section from the bottom end to the top end, the outer diameter of the external thread section is smaller than the outer diameter of the external static sealing surface section, the external thread section is threadedly matched with the internal thread section, the external static sealing surface section is in close contact with the internal static sealing surface section, the length of the external static sealing surface section is greater than the length of the external thread section, the length of the internal static sealing surface section is greater than the length of the external thread section and the difference between the two is greater than 10mm, a static sealing groove is opened in the circumferential direction on the outer circumference of the external static sealing surface section, and the distance between the static sealing groove and the bottom end face of the first-level guide sleeve is greater than the length of the internal static sealing surface section.

2. The super-long and super-large cylinder diameter hydraulic support cylinder according to claim 1 is characterized in that: An annular groove for installing a sealing ring is circumferentially provided on the outer circle of the top end of the outer static sealing surface section, and a chamfer is provided between the bottom end of the outer static sealing surface section and the top end of the external thread section.

3. The super-long and super-large cylinder diameter hydraulic support cylinder according to claim 1 is characterized in that: It also includes cylinder bodies and guide sleeves of three or more levels. The assembly relationship between the cylinder bodies of two adjacent levels is the same as the assembly relationship between the outer cylinder body and the second-level cylinder body, and the assembly relationship between the cylinder body and the guide sleeve of each level is the same as the assembly relationship between the outer cylinder body and the first-level guide sleeve.

4. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 1 or 2, characterized in that: The specific steps include: (1) Drop the piston into the bottom of the secondary cylinder; (2) Identify the buckle between the external thread section of the secondary guide sleeve and the internal thread section of the secondary cylinder; (3) Raise the plunger to a certain height again; (4) Tighten the secondary guide sleeve clockwise according to the required torque; (5) Drop the secondary cylinder into the bottom of the outer cylinder; (6) Using the method of step (2), identify the buckle between the external thread section of the primary guide sleeve and the internal thread section of the outer cylinder body; (7) Raise the secondary cylinder to a certain height again; (8) Tighten the first-stage guide sleeve clockwise according to the required torque; (9) Drop the secondary cylinder body to complete the assembly of the extra-long and extra-large cylinder diameter hydraulic support cylinder.

5. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 4, characterized in that: Step (1) specifically comprises: vertically dropping the piston into the secondary cylinder body; during the dropping process, the inner hole of the secondary cylinder body is connected to the outside air by controlling the opening of the bottom valve assembly, and the piston falls to the cylinder bottom of the secondary cylinder body, so that the bottom end of the piston is completely in contact with the bottom end of the inner hole of the secondary cylinder body. At this time, the inner hole of the secondary cylinder body limits the circumferential part of the piston of the piston, and at the same time, the inner socket of the cylinder bottom of the secondary cylinder body limits the bottom of the piston of the piston.

6. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 4, characterized in that: Step (2) is specifically as follows: mark the position of the threaded buckle head of the external threaded section of the secondary guide sleeve at its top end face, and mark the position of the threaded buckle head of the internal threaded section of the secondary cylinder body at its cylinder mouth end face; then, put the secondary guide sleeve on the piston and place the bottom end of the secondary guide sleeve into the cylinder mouth of the secondary cylinder body; before screwing the secondary guide sleeve, ensure that the threaded buckle head of the external threaded section of the secondary guide sleeve is 30-50mm counterclockwise from the threaded buckle head of the internal threaded section of the secondary cylinder body; press the secondary guide sleeve so that the external threaded section of the secondary guide sleeve contacts the internal threaded section of the secondary cylinder body; at this time, the external static sealing surface section of the secondary guide sleeve and the internal static sealing surface section of the secondary cylinder body first fit and contact to form a matching relationship; use the fitting contact point between the external static sealing surface section of the secondary guide sleeve and the internal static sealing surface section of the secondary cylinder body as the positioning reference, and screw the secondary guide sleeve clockwise for one turn so that the threaded buckle head of the external threaded section of the secondary guide sleeve rotates into the threaded buckle head of the internal threaded section of the secondary cylinder body.

7. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 4, characterized in that: Step (3) is specifically as follows: by controlling the opening of the bottom valve assembly, the inner hole of the secondary cylinder body is connected to the outside air, the piston is pulled up again, so that the bottom end of the piston and the bottom end of the inner hole of the secondary cylinder body are kept at a distance within the range of 100-200 mm, and then the bottom valve assembly is closed.

8. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 4, characterized in that: Step (5) is specifically as follows: the secondary cylinder body is vertically dropped into the outer cylinder body. During the dropping process, the inner hole of the outer cylinder body is connected to the outside air by controlling the opening of the control valve seat. The secondary cylinder body drops to the bottom of the outer cylinder body, so that the bottom end of the secondary cylinder body is completely in contact with the bottom end of the inner hole of the outer cylinder body. At this time, the inner hole of the outer cylinder body limits the lower circumference of the secondary cylinder body. At the same time, the inner socket of the cylinder bottom of the outer cylinder body limits the bottom end of the secondary cylinder body.

9. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 4, characterized in that: Step (6) is specifically as follows: mark the position of the threaded buckle head of the external threaded section of the first-level guide sleeve at its top end face, and mark the position of the threaded buckle head of the internal threaded section of the outer cylinder body at its cylinder mouth end face; then, put the first-level guide sleeve on the second-level cylinder body and put the bottom end of the first-level guide sleeve into the cylinder mouth of the outer cylinder body; before screwing the first-level guide sleeve, ensure that the threaded buckle head of the external threaded section of the first-level guide sleeve is 30-50mm counterclockwise from the threaded buckle head of the internal threaded section of the outer cylinder body; press the first-level guide sleeve so that the external threaded section of the first-level guide sleeve contacts the internal threaded section of the outer cylinder body; at this time, the external static sealing surface section of the first-level guide sleeve and the internal static sealing surface section of the outer cylinder body are first fitted and contacted to form a matching relationship; use the fitting contact point between the external static sealing surface section of the first-level guide sleeve and the internal static sealing surface section of the outer cylinder body as the positioning reference; screw the first-level guide sleeve clockwise for one turn so that the threaded buckle head of the external threaded section of the first-level guide sleeve rotates into the threaded buckle head of the internal threaded section of the outer cylinder body.

10. The method for assembling an extra-long and extra-large cylinder diameter hydraulic support cylinder according to claim 4, characterized in that: Step (7) specifically includes: controlling the opening of the control valve seat so that the inner hole of the outer cylinder body is connected to the outside air, pulling up the secondary cylinder body again so that the bottom end of the secondary cylinder body and the bottom end of the inner hole of the outer cylinder body are kept within a range of 100-200 mm, and then closing the control valve seat; Step (9) is specifically as follows: by controlling the opening of the control valve seat, the inner hole of the outer cylinder body is connected to the outside air, and the secondary cylinder body is dropped to the bottom of the outer cylinder body, thereby completing the assembly of the extra-long and extra-large cylinder diameter hydraulic support cylinder.

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