Height adjusting oil cylinder for coal mining machine

Abstract

The invention discloses a height adjusting oil cylinder for a coal mining machine, which comprises a fixed seat, a piston rod, a cylinder body, a hydraulic system, a piston rod sealing assembly, a piston assembly, a connecting seat and a bushing, one end of the piston rod is welded with the middle part of the fixed seat, the other end of the piston rod is inserted into the cylinder body, and the hydraulic system is arranged between the fixed seat and the piston rod and is used for providing hydraulic driving force; the piston rod sealing assembly is arranged at the tail end of the cylinder body, slidably connected with the piston rod and used for sealing the piston rod and the tail end of the cylinder body and sliding the piston rod, and the piston assembly is arranged at the tail end of the piston rod, slidably connected with the cylinder body and used for sealing the cylinder body and the tail end of the piston rod and sliding the cylinder body. And the linings are respectively sleeved in the reaming holes of the fixed seat and the connecting seat. The device is simple in structure and easy to disassemble and assemble, the machining difficulty is reduced, and the design and use requirements can be met, so that the machining difficulty is reduced, the production efficiency is improved, and the production cost is saved.

Description

Technical Field

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

[0002] With the rapid development of my country's economy, the demand for energy has remained high for a long time, and the main energy consumption in my country will still be coal for a long time. Nowadays, coal mining has basically achieved mechanization and automation, and coal mining machines are the core equipment for mechanized coal mining. The coal mining machine height adjustment cylinder is an important actuator of the coal mining machine height adjustment mechanism. The height adjustment cylinder is mostly positive. The hinged ear at one end of the cylinder body is connected to the hinged ear fixed on the upper part of the cylinder connecting plate of the coal mining machine traction part, and the hinged ear of the piston rod at the other end is connected to the hinged ear of the cutting part connecting frame. During the operation of the coal mining machine, the cylinder barrel remains stationary, the piston rod moves, and the height adjustment cylinder is extended and retracted, driving the rocker arm to rise and fall. When the coal mining machine drum rises to cut the top coal, the height adjustment cylinder piston rod retracts and bears compressive stress; when the coal mining machine drum descends to cut the bottom coal, the height adjustment cylinder piston rod extends and bears tensile stress. The working performance of the height adjustment cylinder directly affects the working efficiency of the coal mining machine and the reliability of equipment operation. In recent years, due to the working characteristics of the height adjustment cylinder of the coal mining machine, the piston rod of the height adjustment cylinder is easily scratched during operation on the coal wall side, and then the reverse cylinder is used, and the piston rod does not move. The production and manufacturing of the cylinder is particularly important, and the reverse height adjustment cylinder brings a series of problems, especially for large diameter and long length cylinders, the parts processing is difficult, the loading and unloading needs to rely on the workers' experience, and the production and processing costs are high. Summary of the invention

[0003] In order to at least partially solve the technical problems existing in the above-mentioned prior art, the present invention provides a height-adjusting oil cylinder for a coal mining machine.

[0004] The height adjustment oil cylinder for coal mining machine of the present invention comprises a fixed seat, a piston rod, a cylinder body, a hydraulic system, a piston rod sealing assembly, a piston assembly, a connecting seat and a bushing, wherein one end of the piston rod is welded to the middle of the fixed seat, and the other end of the piston rod is inserted into the cylinder body, and the hydraulic system is installed between the fixed seat and the piston rod for providing hydraulic driving force, the piston rod sealing assembly is arranged at the end of the cylinder body and is slidably connected to the piston rod, and is used for sealing the piston rod and the end of the cylinder body and providing sliding for the piston rod, the piston assembly is arranged at the end of the piston rod and is slidably connected to the cylinder body, and is used for sealing the cylinder body and the end of the piston rod and providing sliding for the cylinder body, the connecting seat is welded to the middle of the cylinder body, and the bushing is respectively sleeved in the reaming holes of the fixed seat and the connecting seat, wherein:

[0005] The hydraulic system includes an upper guard plate, a lower guard plate, a balancing valve group and a hydraulic pipeline. The balancing valve group is fixed to the piston rod by bolts. The upper guard plate is arranged on the upper side of the balancing valve group to protect the upper side of the balancing valve group. The lower guard plate is arranged on the lower side of the balancing valve group to protect the lower side of the balancing valve group. The hydraulic pipeline is arranged on the balancing valve group to supply oil to the cylinder body.

[0006] Furthermore, in the above-mentioned height-adjusting cylinder for coal mining machines, the piston rod sealing assembly includes a guide sleeve, a dust ring, a first iron wire, a first guide ring, a piston sealing gasket, an O-ring and a retaining ring. The dust ring is nested at the front end of the inner wall of the guide sleeve, the first iron wire is nested at the front end of the outer wall of the guide sleeve, the piston sealing gasket is nested in the middle of the inner wall of the guide sleeve, the first guide ring is nested in the inner wall of the guide sleeve close to both sides of the piston sealing gasket, and the O-ring and the retaining ring are arranged and nested in the middle of the outer wall of the guide sleeve.

[0007] Furthermore, in the above-mentioned coal mining machine height adjustment cylinder, the inner diameter of the guide sleeve is equal to the outer diameter of the piston rod, the guide sleeve is slidingly connected to the piston rod through the first guide ring, and the inner wall of the guide sleeve is abutted and sealed against the outer wall of the piston rod through the dust ring and the piston sealing gasket.

[0008] Furthermore, in the above-mentioned height-adjusting cylinder for coal mining machine, the outer diameter of the guide sleeve is equal to the inner diameter of the cylinder body, the guide sleeve is fixedly connected to the cylinder body through the first iron wire, and the outer wall of the guide sleeve is sealed against the inner wall of the cylinder body through the O-ring and the retaining ring.

[0009] Furthermore, in the above-mentioned height-adjusting cylinder for coal mining machines, the piston assembly includes a piston sleeve, a second iron wire, a piston sealing ring and a second guide ring, the second iron wire is nested in the front end of the inner wall of the piston sleeve, the piston sealing ring is nested in the middle of the outer wall of the piston sleeve, and the second guide ring is nested in the outer wall of the piston sleeve close to both sides of the piston sealing ring.

[0010] Furthermore, in the above-mentioned height adjustment cylinder for coal mining machine, the outer diameter of the piston sleeve is equal to the inner diameter of the cylinder body, the piston sleeve is slidably connected to the cylinder body through the second guide ring, and the outer wall of the piston sleeve is abutted and sealed against the inner wall of the cylinder body through the piston sealing ring.

[0011] Furthermore, in the above-mentioned height-adjusting cylinder for the coal mining machine, the inner diameter of the piston sleeve is equal to the outer diameter of the piston rod, and the piston sleeve is fixedly connected to the piston rod through the second iron wire.

[0012] Furthermore, in the above-mentioned height-adjusting cylinder for coal mining machine, one end of the hydraulic pipeline is connected to the output end of the balancing valve group, and the other end of the hydraulic pipeline passes through the piston rod and is connected to the inside of the cylinder body.

[0013] The height adjustment oil cylinder for coal mining machine of the present invention has the following advantages and beneficial effects:

[0014] The invention has a simple structure and is easy to assemble and disassemble. The cylinder function is realized by the cooperation of the piston rod and the cylinder body and the use of a hydraulic pipeline to fill the cylinder body with oil, thereby reducing the processing difficulty and meeting the design and use requirements, thereby reducing the processing difficulty, improving production efficiency and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the height-adjusting oil cylinder for a coal mining machine of the present invention;

[0017] Figure 2 It is a schematic cross-sectional structure diagram of a piston rod seal assembly of a height adjustment cylinder for a coal mining machine of the present invention;

[0018] Figure 3 It is a schematic cross-sectional structure diagram of a piston assembly of a height-adjusting oil cylinder for a coal mining machine of the present invention;

[0019] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of AA.

[0020] Description of reference numerals:

[0021] 1: Fixed seat; 2: Piston rod; 3: Cylinder body;

[0022] 4: hydraulic system, 41: upper guard plate, 42: lower guard plate, 43: balancing valve group, 44: hydraulic pipeline;

[0023] 5: piston rod sealing assembly, 51: guide sleeve, 52: dust ring, 53: first iron wire, 54: first guide ring, 55: piston sealing gasket, 56: O-ring, 57: retaining ring;

[0024] 6: piston assembly, 61: piston sleeve, 62: second iron wire, 63: piston sealing ring, 64: second guide ring;

[0025] 7: Connecting seat; 8: Bushing. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 4 As shown, the height adjustment cylinder for coal mining machine of the present invention comprises a fixed seat 1, a piston rod 2, a cylinder body 3, a hydraulic system 4, a piston rod sealing assembly 5, a piston assembly 6, a connecting seat 7 and a bushing 8. One end of the piston rod 2 is welded to the middle of the fixed seat 1, and the other end of the piston rod 2 is inserted into the cylinder body 3. The hydraulic system 4 is installed between the fixed seat 1 and the piston rod 2 to provide a hydraulic driving force. The piston rod sealing assembly 5 is arranged at the end of the cylinder body 3 and is slidably connected to the piston rod 2, which is used to seal the piston rod 2 and the end of the cylinder body 3 and provide sliding for the piston rod 2. The piston assembly 6 is arranged at the end of the piston rod 2 and is slidably connected to the cylinder body 3, which is used to seal the cylinder body 3 and the end of the piston rod 2 and provide sliding for the cylinder body 3. The connecting seat 7 is welded in the middle of the cylinder body 3, and the bushing 8 is respectively sleeved in the reaming holes of the fixed seat 1 and the connecting seat 7, wherein:

[0028] The hydraulic system 4 includes an upper guard plate 41, a lower guard plate 42, a balancing valve group 43 and a hydraulic pipeline 44. The balancing valve group 43 is fixed to the piston rod 2 by bolts. The upper guard plate 41 is arranged on the upper side of the balancing valve group 43 to protect the upper side of the balancing valve group 43. The lower guard plate 42 is arranged on the lower side of the balancing valve group 43 to protect the lower side of the balancing valve group 43. The hydraulic pipeline 44 is arranged on the balancing valve group 43 to supply oil to the cylinder body 3.

[0029] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, the piston rod sealing assembly 5 includes a guide sleeve 51, a dust ring 52, a first iron wire 53, a first guide ring 54, a piston sealing gasket 55, an O-ring 56 and a retaining ring 57. The dust ring 52 is nested at the front end of the inner wall of the guide sleeve 51, the first iron wire 53 is nested at the front end of the outer wall of the guide sleeve 51, the piston sealing gasket 55 is nested in the middle of the inner wall of the guide sleeve 51, the first guide ring 54 is nested in the inner wall of the guide sleeve 51 close to both sides of the piston sealing gasket 55, and the O-ring 56 and the retaining ring 57 are arranged and nested in the middle of the outer wall of the guide sleeve 51.

[0030] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, the inner diameter of the guide sleeve 51 is equal to the outer diameter of the piston rod 2, and the guide sleeve 51 is slidably connected to the piston rod 2 through the first guide ring 54. The inner wall of the guide sleeve 51 is sealed against the outer wall of the piston rod 2 through the dust ring 52 and the piston sealing gasket 55. Therefore, when the cylinder body 3 and the piston rod 2 move relative to each other, the guide sleeve 51 slides on the piston rod 2 through the first guide ring 54, and is sealed to prevent dust through the dust ring 52, and is sealed through the piston sealing gasket 55 to prevent leakage of hydraulic oil.

[0031] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, the outer diameter of the guide sleeve 51 is equal to the inner diameter of the cylinder body 3, the guide sleeve 51 is fixedly connected to the cylinder body 3 via the first iron wire 53, and the outer wall of the guide sleeve 51 is sealed against the inner wall of the cylinder body 3 via the O-ring 56 and the retaining ring 57, so that the guide sleeve 51 is limited by the first iron wire 53 and the cylinder body 3 to prevent the guide sleeve 51 from falling out when the cylinder body 3 moves. The guide sleeve 51 forms a seal with the cylinder body 3 via the O-ring 56 and the retaining ring 57 to prevent the hydraulic oil from leaking.

[0032] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, the piston assembly 6 includes a piston sleeve 61, a second iron wire 62, a piston sealing ring 63 and a second guide ring 64. The second iron wire 62 is nested in the front end of the inner wall of the piston sleeve 61, the piston sealing ring 63 is nested in the middle of the outer wall of the piston sleeve 61, and the second guide ring 64 is nested in the outer wall of the piston sleeve 61 near both sides of the piston sealing ring 63.

[0033] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, the outer diameter of the piston sleeve 61 is equal to the inner diameter of the cylinder body 3, the piston sleeve 61 is slidably connected to the cylinder body 3 through the second guide ring 64, and the outer wall of the piston sleeve 61 is sealed against the inner wall of the cylinder body 3 through the piston sealing ring 63, so that when the cylinder body 3 and the piston rod 2 move relative to each other, the cylinder body 3 slides through the second guide ring 64 on the piston sleeve 61, and the piston sleeve 61 forms a seal with the cylinder body 3 through the piston sealing ring 63 to prevent leakage of hydraulic oil.

[0034] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, the inner diameter of the piston sleeve 61 is equal to the outer diameter of the piston rod 2, and the piston sleeve 61 is fixedly connected to the piston rod 2 by the second iron wire 62, so that the piston sleeve 61 is limited by the second iron wire 62 and the piston rod 2, thereby preventing the piston sleeve 61 from moving along the piston rod 2 when the cylinder body 3 is filled with oil.

[0035] Furthermore, in the height-adjusting cylinder for the coal mining machine of the present invention, one end of the hydraulic pipe 44 is connected to the output end of the balancing valve group 43, and the other end of the hydraulic pipe 44 passes through the piston rod 2 and is connected to the inside of the cylinder body 3, so that the hydraulic oil enters between the cylinder body 3 and the piston rod 2 through the hydraulic pipe 44 after being processed by the balancing valve group 43, and provides a driving force for the cylinder body 3 or the piston rod 2, thereby reducing the processing difficulty and meeting the use requirements.

[0036] Specifically, when in use, the hydraulic oil is processed by the balancing valve group 43 and then enters between the cylinder body 3 and the piston rod 2 through the hydraulic pipeline 44 to provide a driving force. At this time, the hydraulic oil pushes the cylinder body 3 to extend. During the extension of the cylinder body 3, the guide sleeve 51 fixed to the cylinder body 3 by the first iron wire 53 slides along the piston rod 2 through the first guide ring 54, and the piston sleeve 61 fixed to the piston rod 2 by the second iron wire 62 moves through the second guide ring 64. At the same time, a hydraulic chamber is formed between the piston sleeve 61 and the cylinder body 3. The control of the hydraulic oil by the balancing valve group 43 can realize the extension and retraction of the cylinder body 3.

[0037] To sum up, compared with the prior art, the height-adjusting cylinder for coal mining machines of the present invention has the following advantages and beneficial effects: the present invention has a simple structure and is easy to disassemble and assemble. The cylinder function is realized by cooperating with the piston rod and the cylinder body and filling the cylinder body with oil through a hydraulic pipeline, thereby reducing the processing difficulty and meeting the design and use requirements, thereby reducing the processing difficulty, improving production efficiency, and saving production costs.

[0038] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A height adjustment cylinder for a coal mining machine, characterized in that: The height adjustment cylinder for coal mining machine comprises a fixed seat, a piston rod, a cylinder body, a hydraulic system, a piston rod sealing assembly, a piston assembly, a connecting seat and a bushing. One end of the piston rod is welded to the middle of the fixed seat, and the other end of the piston rod is inserted into the cylinder body. The hydraulic system is installed between the fixed seat and the piston rod to provide hydraulic driving force. The piston rod sealing assembly is arranged at the end of the cylinder body and is slidably connected to the piston rod, which is used for sealing the piston rod and the end of the cylinder body and providing sliding for the piston rod. The piston assembly is arranged at the end of the piston rod and is slidably connected to the cylinder body, which is used for sealing the cylinder body and the end of the piston rod and providing sliding for the cylinder body. The connecting seat is welded in the middle of the cylinder body, and the bushing is respectively sleeved in the reaming holes of the fixed seat and the connecting seat, wherein: The hydraulic system includes an upper guard plate, a lower guard plate, a balancing valve group and a hydraulic pipeline. The balancing valve group is fixed to the piston rod by bolts. The upper guard plate is arranged on the upper side of the balancing valve group to protect the upper side of the balancing valve group. The lower guard plate is arranged on the lower side of the balancing valve group to protect the lower side of the balancing valve group. The hydraulic pipeline is arranged on the balancing valve group to supply oil to the cylinder body.

2. The height adjustment cylinder for coal mining machine according to claim 1, characterized in that: The piston rod sealing assembly includes a guide sleeve, a dust ring, a first iron wire, a first guide ring, a piston sealing gasket, an O-ring and a retaining ring. The dust ring is nested at the front end of the inner wall of the guide sleeve, the first iron wire is nested at the front end of the outer wall of the guide sleeve, the piston sealing gasket is nested in the middle of the inner wall of the guide sleeve, the first guide ring is nested in the inner wall of the guide sleeve near both sides of the piston sealing gasket, and the O-ring and the retaining ring are arranged and nested in the middle of the outer wall of the guide sleeve.

3. The height adjustment cylinder for coal mining machine according to claim 2, characterized in that: The inner diameter of the guide sleeve is equal to the outer diameter of the piston rod. The guide sleeve is slidably connected to the piston rod through the first guide ring. The inner wall of the guide sleeve is in abutment and sealed with the outer wall of the piston rod through the dust ring and the piston sealing gasket.

4. The height adjustment cylinder for coal mining machine according to claim 2, characterized in that: The outer diameter of the guide sleeve is equal to the inner diameter of the cylinder body. The guide sleeve is fixedly connected to the cylinder body through the first iron wire. The outer wall of the guide sleeve is abutted and sealed against the inner wall of the cylinder body through the O-ring and the retaining ring.

5. The height adjustment cylinder for coal mining machine according to claim 1, characterized in that: The piston assembly includes a piston sleeve, a second iron wire, a piston sealing ring and a second guide ring, the second iron wire is nested in the front end of the inner wall of the piston sleeve, the piston sealing ring is nested in the middle of the outer wall of the piston sleeve, and the second guide ring is nested in the outer wall of the piston sleeve near both sides of the piston sealing ring.

6. The height adjustment cylinder for coal mining machine according to claim 5, characterized in that: The outer diameter of the piston sleeve is equal to the inner diameter of the cylinder body. The piston sleeve is slidably connected to the cylinder body through the second guide ring. The outer wall of the piston sleeve is abutted and sealed against the inner wall of the cylinder body through the piston sealing ring.

7. The height adjustment cylinder for coal mining machine according to claim 5, characterized in that: The inner diameter of the piston sleeve is equal to the outer diameter of the piston rod, and the piston sleeve is fixedly connected to the piston rod through the second iron wire.

8. The height adjustment cylinder for coal mining machine according to claim 1, characterized in that: One end of the hydraulic pipeline is connected to the output end of the balance valve group, and the other end of the hydraulic pipeline passes through the piston rod and is communicated with the inside of the cylinder body.

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