Height adjusting oil cylinder of coal mining machine

Abstract

The utility model discloses a coal mining machine height adjusting oil cylinder which comprises a piston rod and a cylinder barrel, a guide sleeve is arranged at the front end of the cylinder barrel, a double static seal is arranged between the guide sleeve and the inner wall of the cylinder barrel, the double static seal comprises an inner layer sealing ring and an outer layer sealing ring, the inner layer sealing ring is located on the rear side of the outer layer sealing ring, and the outer layer sealing ring is located on the rear side of the outer layer sealing ring. A check ring is arranged on the front side of the outer-layer sealing ring, a dustproof ring is arranged between the guide sleeve and the piston rod, and a coal scraping ring is arranged at the front end of the guide sleeve. The guide sleeve is reasonable in structural design, due to the arrangement of double static seals, the problem that static seals of the guide sleeve and the cylinder barrel are prone to failure and leakage due to traditional precise seals can be effectively solved, and the use reliability of the height adjusting oil cylinder under the long-time heavy-load working condition can be effectively improved; the dustproof ring can be prevented from being extruded and damaged by coal slime deeply combined with the surface of the piston rod, so that the service life of the dustproof ring is greatly prolonged, the reliability of the oil cylinder is ensured, and the failure of the dustproof ring is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mining machines, and in particular relates to a height-adjusting oil cylinder for a coal mining machine. Background Art

[0002] The height adjustment cylinder is one of the important parts of the coal mining machine and is the actuator of the auxiliary hydraulic system. Its extension and contraction provide power for the rocker arm of the coal mining machine, so that the rocker arm of the coal mining machine can work within the set range to meet the needs of coal mining under different working conditions. At present, the static seal of the guide sleeve and the cylinder barrel is prone to fatigue damage or material aging under the action of the alternating hydraulic pressure in the rod chamber of the cylinder, which can easily cause the static seal of the guide sleeve and the cylinder barrel to fail and leak. In addition, the surface of the piston rod is prone to accumulation of coal ash and coal slime. When the dust ring passes through the surface of the piston rod, it is easily squeezed and damaged by the coal slime that is deeply combined with the rod surface, causing the dust ring to fail, and then causing pollutants outside the cylinder to enter the sealing chamber of the guide sleeve, causing the seal to fail and the cylinder to leak.

[0003] Therefore, it is necessary to propose a coal mining machine height adjustment cylinder to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a coal mining machine height adjustment cylinder in view of the deficiencies in the above-mentioned prior art, and the structure design is reasonable. The setting of double static seals can effectively solve the problem that the static seal between the guide sleeve and the cylinder barrel is easily invalidated and leaks out due to the traditional fine seal, and can effectively improve the reliability of the height adjustment cylinder under long-term heavy-load conditions. At the same time, by setting a coal scraper ring at the front end of the guide sleeve, the dust ring can be prevented from being squeezed and damaged by the coal mud deeply combined with the surface of the piston rod, so that the service life of the dust ring is greatly improved, thereby ensuring the reliability of the cylinder and avoiding the dust ring from failing.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a coal mining machine height adjustment cylinder, including a piston rod and a cylinder barrel for accommodating the piston rod, characterized in that: a guide sleeve for guiding the piston rod is arranged at the front end of the cylinder barrel, the guide sleeve, the cylinder barrel and the piston rod are coaxially arranged, the guide sleeve sliding sleeve is arranged on the outside of the piston rod, a double static seal is arranged between the guide sleeve and the inner wall of the cylinder barrel, the double static seal includes an inner sealing ring and an outer sealing ring, the inner sealing ring is located at the rear side of the outer sealing ring, and a retaining ring is arranged at the front side of the outer sealing ring;

[0006] A dustproof ring is arranged between the guide sleeve and the piston rod, the dustproof ring sliding sleeve is arranged on the piston rod, and a coal scraper ring is arranged at the front end of the guide sleeve, and the coal scraper ring sliding sleeve is arranged on the piston rod.

[0007] The above-mentioned coal mining machine height adjustment cylinder is characterized in that: the guide sleeve includes a small diameter section extending into the interior of the cylinder and a large diameter section located at the front end of the cylinder, and the large diameter section of the guide sleeve is fastened to the cylinder by a plurality of locking screws, and the locking screws are arranged along the axial direction of the guide sleeve.

[0008] The above-mentioned coal mining machine height adjustment cylinder is characterized in that: the outer wall of the small diameter section of the guide sleeve is provided with a first installation groove for installing the inner sealing ring, and the outer wall of the small diameter section of the guide sleeve is also provided with a second installation groove for installing the outer sealing ring and the retaining ring.

[0009] The above-mentioned coal mining machine height adjustment cylinder is characterized in that: the inner wall of the guide sleeve is provided with a dustproof ring installation groove for installing a dustproof ring, and the front end of the guide sleeve is provided with a coal scraper ring installation groove for installing a coal scraper ring.

[0010] The above-mentioned coal mining machine height adjustment cylinder is characterized in that the coal scraper ring installation groove passes through the front end surface and the inner wall of the guide sleeve.

[0011] The above-mentioned coal mining machine height adjustment cylinder is characterized in that a coal-proof pressure plate for fixing the coal scraper ring is also provided at the front end of the guide sleeve, and the coal-proof pressure plate is fastened to the guide sleeve by fastening screws.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The utility model arranges a double static seal between the guide sleeve and the inner wall of the cylinder barrel. The inner sealing ring in the double static seal has good response characteristics to the alternating impact pressure and timely compensation for a large range of deformation. The outer sealing ring and the retaining ring serve as the second safety seal, which greatly improves the adaptability of the double static seal here to the alternating hydraulic pressure of high mining height and heavy load impact, thereby improving the reliability of the height adjustment cylinder under long-term heavy load conditions.

[0014] 2. The utility model provides a coal scraper ring at the front end of the guide sleeve. During the extension and retraction process of the oil cylinder, the coal scraper ring can be used to pre-treat the coal slime and dust accumulated on the surface of the piston rod, thereby preventing the dustproof ring from being squeezed and damaged by the coal slime deeply combined with the surface of the piston rod, thereby greatly improving the service life of the dustproof ring, thereby ensuring the reliability of the oil cylinder and avoiding the problem that the dustproof ring fails, causing pollutants outside the oil cylinder to enter the sealing chamber of the guide sleeve, resulting in failure of the sealing structure and leakage of the oil cylinder.

[0015] To sum up, the utility model has a reasonable structural design, and the setting of the double static seal can effectively solve the problem that the traditional fine seal is prone to cause the static seal failure and leakage between the guide sleeve and the cylinder barrel, and can effectively improve the reliability of the height adjustment cylinder under long-term heavy-load conditions. At the same time, by arranging a coal scraper ring at the front end of the guide sleeve, the dust ring can be prevented from being squeezed and damaged by the coal mud deeply combined with the surface of the piston rod, so that the service life of the dust ring is greatly improved, thereby ensuring the reliability of the cylinder and avoiding the failure of the dust ring.

[0016] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Description of reference numerals:

[0019] 1—piston rod; 2—cylinder barrel; 3—guide sleeve;

[0020] 4—inner sealing ring; 5—outer sealing ring; 6—retaining ring;

[0021] 7—dustproof ring; 8—coal scraper ring; 9—locking screw;

[0022] 10—Coal-proof pressure plate. DETAILED DESCRIPTION

[0023] like Figure 1 As shown, the utility model comprises a piston rod 1 and a cylinder 2 for accommodating the piston rod 1, a guide sleeve 3 for guiding the piston rod 1 is arranged at the front end of the cylinder 2, the guide sleeve 3, the cylinder 2 and the piston rod 1 are coaxially arranged, the guide sleeve 3 is slidably sleeved on the outside of the piston rod 1, a double static seal is arranged between the guide sleeve 3 and the inner wall of the cylinder 2, the double static seal comprises an inner sealing ring 4 and an outer sealing ring 5, the inner sealing ring 4 is located at the rear side of the outer sealing ring 5, and a retaining ring 6 is arranged at the front side of the outer sealing ring 5;

[0024] A dust ring 7 is provided between the guide sleeve 3 and the piston rod 1 , and the dust ring 7 is slidably sleeved on the piston rod 1 . A coal scraper ring 8 is provided at the front end of the guide sleeve 3 , and the coal scraper ring 8 is slidably sleeved on the piston rod 1 .

[0025] In actual use, the inner sealing ring 4 adopts the large-diameter imported SKF hole sealing ring KO1-R. The inner sealing ring 4 has good response characteristics to the alternating impact pressure and timely compensation for a large range of deformation. The outer sealing ring 5 adopts an O-ring. The outer sealing ring 5 and the retaining ring 6 serve as the second insurance seal, which greatly improves the adaptability of the double static seal here to the alternating hydraulic pressure of high mining height and heavy load impact, thereby improving the reliability of the height adjustment cylinder under long-term heavy load conditions.

[0026] It should be noted that, by arranging the coal scraper ring 8 at the front end of the guide sleeve 3, during the extension and retraction process of the cylinder, the coal scraper ring 3 can be used to pre-treat the coal slime and dust accumulated on the surface of the piston rod 1, thereby preventing the dustproof ring 2 from being squeezed and damaged by the coal slime deeply integrated with the surface of the piston rod 1, thereby greatly improving the service life of the dustproof ring 2, thereby ensuring the reliability of the cylinder and avoiding the problem that the dustproof ring 2 fails, causing pollutants outside the cylinder to enter the sealing chamber of the guide sleeve 3, resulting in failure of the sealing structure and leakage of the cylinder.

[0027] In specific implementation, the piston rod 1 adopts a laser cladding treatment process containing nickel-chromium alloy powder, and the thickness of the cladding layer is greater than or equal to 0.5mm; the surface hardness of the rod after cladding reaches HRC53, and the bonding force between the cladding layer and the material matrix is ​​greater than 350MPa; the anti-bump and corrosion resistance of the piston rod surface is greatly improved compared with the original chrome plating process, which greatly increases the reliability of the surface quality of the piston rod 1.

[0028] In this embodiment, the guide sleeve 3 includes a small diameter section extending into the interior of the cylinder 2 and a large diameter section located at the front end of the cylinder 2. The large diameter section of the guide sleeve 3 is fastened to the cylinder 2 by a plurality of locking screws 9, and the locking screws 9 are arranged along the axial direction of the guide sleeve 3.

[0029] In actual use, the inner diameter of the small diameter section of the guide sleeve 3 is the same as the inner diameter of the large diameter section, the outer diameter of the small diameter section is smaller than the outer diameter of the large diameter section, the outer diameter of the small diameter section of the guide sleeve 3 is larger than the inner diameter of the cylinder 2, and the outer diameter of the large diameter section of the guide sleeve 3 is equal to the outer diameter of the cylinder 2; the step surface between the large diameter section and the small diameter section of the guide sleeve 3 is in close contact with the front end surface of the cylinder 2.

[0030] In this embodiment, the outer wall of the small diameter section of the guide sleeve 3 is provided with a first installation groove for installing the inner sealing ring 4, and the outer wall of the small diameter section of the guide sleeve 3 is also provided with a second installation groove for installing the outer sealing ring 5 and the retaining ring 6.

[0031] In actual use, the first mounting groove is arranged away from the large diameter section, and the second mounting groove is arranged close to the large diameter section.

[0032] In a specific implementation, the first installation groove and the second installation groove are both annular grooves, and the outer sealing ring 5 and the retaining ring 6 are both installed in the second installation groove.

[0033] In this embodiment, the inner wall of the guide sleeve 3 is provided with a dustproof ring installation groove for installing the dustproof ring 7 , and the front end of the guide sleeve 3 is provided with a coal scraper ring installation groove for installing the coal scraper ring 8 .

[0034] In actual use, the dust ring installation groove is located at the rear side of the coal scraper ring installation groove, and the dust ring installation groove is arranged close to the coal scraper ring installation groove. Both the dust ring installation groove and the coal scraper ring installation groove are annular grooves.

[0035] In this embodiment, the coal scraper ring installation groove passes through the front end surface and the inner wall of the guide sleeve 3.

[0036] In this embodiment, a coal-proof pressure plate 10 for fixing the coal scraper ring 8 is further provided at the front end of the guide sleeve 3 , and the coal-proof pressure plate 10 is fastened to the guide sleeve 3 by a plurality of fastening screws.

[0037] In actual use, a coal scraper ring mounting groove for installing the coal scraper ring 8 is provided on one end of the coal prevention pressure plate 10 close to the coal scraper ring 8, and the coal scraper ring 8 is installed in a groove formed by the coal scraper ring mounting groove on the coal prevention pressure plate 10 and the coal scraper ring mounting groove on the guide sleeve 3.

[0038] It should be noted that the rear end of the coal scraper ring 8 is embedded in the guide sleeve 3, and the front end of the coal scraper ring 8 extends to the front side of the guide sleeve 3. The coal prevention pressure plate 10 is an annular pressure plate. The outer diameter of the coal prevention pressure plate 10 is larger than the outer diameter of the coal scraper ring 8. The coal prevention pressure plate 10 is sleeved on the outside of the piston rod 1 and is coaxially arranged with the piston rod. The inner diameter of the coal prevention pressure plate 10 is larger than the diameter of the piston rod 1, and the inner diameter of the coal prevention pressure plate 10 is larger than the inner diameter of the coal scraper ring 8.

[0039] It should be noted that the provision of the coal-proof pressure plate 10 can not only block large pieces of coal, but also effectively fix the coal scraper ring 8 .

[0040] During specific implementation, according to the structural characteristics and operating conditions of the balancing valve in the control valve assembly of the height adjustment cylinder, a bypass safety valve can be set to eliminate the damage to the balancing valve core caused by frequent opening of the safety unloading function of the balancing valve core, and the safety protection opening pressure setting value of the bypass safety valve can be set to be lower than the pressure value of the safety protection setting of the balancing valve. When the height adjustment cylinder receives the impact load of the cutting reaction force of the coal mining machine, the bypass safety valve will be opened safely first to release the impact pressure peak, thereby improving the safety and reliability of the main locking balancing valve core, increasing the service life of the coal mining machine height adjustment cylinder control valve block assembly, and thereby improving the overall reliability of the height adjustment cylinder.

[0041] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A coal mining machine height adjustment cylinder, comprising a piston rod (1) and a cylinder barrel (2) for accommodating the piston rod (1), characterized in that: A guide sleeve (3) for guiding the piston rod (1) is arranged at the front end of the cylinder (2); the guide sleeve (3), the cylinder (2) and the piston rod (1) are coaxially arranged; the guide sleeve (3) is slidably sleeved on the outside of the piston rod (1); a double static seal is arranged between the guide sleeve (3) and the inner wall of the cylinder (2); the double static seal comprises an inner sealing ring (4) and an outer sealing ring (5); the inner sealing ring (4) is located at the rear side of the outer sealing ring (5); and a retaining ring (6) is arranged at the front side of the outer sealing ring (5); A dustproof ring (7) is arranged between the guide sleeve (3) and the piston rod (1), and the dustproof ring (7) is slidably mounted on the piston rod (1). A coal scraper ring (8) is arranged at the front end of the guide sleeve (3), and the coal scraper ring (8) is slidably mounted on the piston rod (1).

2. A coal mining machine height adjustment cylinder according to claim 1, characterized in that: The guide sleeve (3) comprises a small diameter section extending into the interior of the cylinder barrel (2) and a large diameter section located at the front end of the cylinder barrel (2); the large diameter section of the guide sleeve (3) and the cylinder barrel (2) are fastened together by a plurality of locking screws (9); the locking screws (9) are arranged along the axial direction of the guide sleeve (3).

3. A coal mining machine height adjustment cylinder according to claim 2, characterized in that: The outer wall of the small diameter section of the guide sleeve (3) is provided with a first installation groove for installing the inner sealing ring (4), and the outer wall of the small diameter section of the guide sleeve (3) is also provided with a second installation groove for installing the outer sealing ring (5) and the retaining ring (6).

4. A coal mining machine height adjustment cylinder according to claim 1, characterized in that: The inner wall of the guide sleeve (3) is provided with a dustproof ring installation groove for installing a dustproof ring (7), and the front end of the guide sleeve (3) is provided with a coal scraper ring installation groove for installing a coal scraper ring (8).

5. A coal mining machine height adjustment cylinder according to claim 4, characterized in that: The coal scraper ring installation groove passes through the front end surface and the inner wall of the guide sleeve (3).

6. A coal mining machine height adjustment cylinder according to claim 1, characterized in that: The front end of the guide sleeve (3) is also provided with a coal-proof pressure plate (10) for fixing the coal scraper ring (8); the coal-proof pressure plate (10) is fastened to the guide sleeve (3) by means of fastening screws.

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