Height adjusting oil cylinder for coal mining machine
By designing a new structure for the height adjustment cylinder of the coal mining machine, the processing process was simplified, the processing difficulty was reduced, the production efficiency was improved, the problem of high processing difficulty of large-diameter and long-length cylinders in the existing technology was solved, and the production cost was reduced.
Patent Information
- Application Number
- CN202520470021.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-18
AI Technical Summary
The existing coal mining machine height adjustment cylinders, especially the large-diameter and long-length cylinders, are difficult to process and have high production costs. Moreover, the processing of components depends on the experience of workers, making it difficult to meet the needs of mechanized mining.
A height-adjusting cylinder structure was designed, comprising a fixed seat, piston rod, cylinder body, hydraulic system, piston rod sealing assembly, piston assembly, and connecting seat. The hydraulic system provides driving force, and a sealing assembly and connecting structure are set between the piston rod and the cylinder body, which simplifies the machining process and reduces the machining difficulty.
This technology enables easy disassembly and assembly of the hydraulic cylinders, reduces processing difficulty, improves production efficiency, saves production costs, and meets the needs of mechanized mining.
Smart Images
Figure CN223839463U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of hydraulic cylinder technology, and in particular relates to a height adjustment hydraulic cylinder for a coal mining machine. Background Technology
[0002] With the rapid development of my country's economy, energy demand has remained high for a long time, and coal will continue to be the main source of energy consumption. Currently, coal mining has largely achieved mechanization and automation, and the coal mining machine is the core equipment for mechanized coal mining. The height adjustment cylinder of the coal mining machine is a crucial actuator in its height adjustment mechanism. Height adjustment cylinders are typically mounted upright, with one end of the cylinder body hinged to a hinged lug fixed to the upper part of the cylinder connecting plate of the coal mining machine's traction unit, and the other end of the piston rod hinged to a hinged lug on the cutting unit's connecting frame. During operation, the cylinder remains stationary while the piston rod moves, causing the height adjustment cylinder to extend and retract, driving the rocker arm to rise and fall. When the coal mining machine drum rises to cut the top coal, the piston rod of the height adjustment cylinder retracts, bearing compressive stress; when the coal mining machine drum descends to cut the bottom coal, the piston rod extends, bearing tensile stress. The performance of the height adjustment cylinder directly affects the working efficiency and operational reliability of the coal mining machine. In recent years, due to the working characteristics of the height adjustment cylinders in coal mining machines, the piston rods of the cylinders are easily scratched during operation on the coal face side. Therefore, reverse-mounted cylinders are adopted, where the piston rod remains stationary. The manufacturing of these cylinders is particularly important, and the reverse-mounted height adjustment cylinders bring a series of problems, especially for large-diameter, long-length cylinders. The components are difficult to process, loading and unloading rely on worker experience, and production costs are high. Utility Model Content
[0003] In order to at least partially solve the technical problems existing in the prior art, the present invention provides a height adjustment cylinder for a coal mining machine.
[0004] The height-adjusting hydraulic cylinder for a coal mining machine of this utility model includes 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 disposed at the end of the cylinder body and slidably connected to the piston rod, for sealing the piston rod at the end of the cylinder body and providing sliding for the piston rod. The piston assembly is disposed at the end of the piston rod and slidably connected to the cylinder body, for sealing the cylinder body at 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. The bushings are respectively fitted into the hinge holes of the fixed seat and the connecting seat, wherein:
[0005] The hydraulic system includes an upper guard plate, a lower guard plate, a balance valve assembly, and hydraulic pipelines. The balance valve assembly is fixed to the piston rod by bolts. The upper guard plate is located on the upper side of the balance valve assembly to protect the upper side of the balance valve assembly. The lower guard plate is located on the lower side of the balance valve assembly to protect the lower side of the balance valve assembly. The hydraulic pipelines are located on the balance valve assembly to supply oil to the cylinder.
[0006] Furthermore, in the aforementioned height-adjusting hydraulic cylinder for a coal mining machine, the piston rod sealing assembly includes a guide sleeve, a dust seal, a first wire, a first guide ring, a piston gasket, an O-ring, and a retaining ring. The dust seal is nested at the front end of the inner wall of the guide sleeve, the first wire is nested at the front end of the outer wall of the guide sleeve, the piston gasket is nested in the middle of the inner wall of the guide sleeve, the first guide ring is nested on both sides of the inner wall of the guide sleeve near the piston 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 aforementioned height-adjusting cylinder for the coal mining machine, 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, and the inner wall of the guide sleeve is sealed to the outer wall of the piston rod through the dustproof ring and the piston sealing gasket.
[0008] Furthermore, in the aforementioned height adjustment cylinder for the 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 via the first iron wire, and the outer wall of the guide sleeve is sealed against the inner wall of the cylinder body via the O-ring and the retaining ring.
[0009] Furthermore, in the aforementioned height-adjusting cylinder for a coal mining machine, the piston assembly includes a piston sleeve, a second wire, a piston sealing ring, and a second guide ring. The second wire is nested at 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 on both sides of the outer wall of the piston sleeve near the piston sealing ring.
[0010] Furthermore, in the aforementioned height-adjusting cylinder for the 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 abuts and seals against the inner wall of the cylinder body through the piston sealing ring.
[0011] Furthermore, in the aforementioned 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 via the second iron wire.
[0012] Furthermore, in the aforementioned height adjustment cylinder for the coal mining machine, 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 communicates with the inside of the cylinder body.
[0013] The height adjustment cylinder for the coal mining machine of this utility model has the following advantages and beneficial effects:
[0014] This utility model has a simple structure and is easy to assemble and disassemble. It achieves the function of a hydraulic cylinder by cooperating with the piston rod and the cylinder body and using hydraulic pipelines to fill the cylinder body with oil. This reduces the processing difficulty and meets the design requirements, thereby reducing the processing difficulty, improving production efficiency, and saving production costs. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:
[0016] Figure 1 This is a schematic diagram of the overall structure of the height adjustment cylinder for a coal mining machine according to this utility model.
[0017] Figure 2 This is a schematic cross-sectional view of the piston rod sealing assembly of the height-adjusting hydraulic cylinder for a coal mining machine according to the present invention.
[0018] Figure 3 This is a schematic cross-sectional view of the piston assembly of the height adjustment cylinder for a coal mining machine according to this utility model.
[0019] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of AA.
[0020] Explanation of reference numerals in the attached figures:
[0021] 1: Mounting base; 2: Piston rod; 3: Cylinder body;
[0022] 4: Hydraulic system; 41: Upper guard plate; 42: Lower guard plate; 43: Balance valve assembly; 44: Hydraulic pipeline;
[0023] 5: Piston rod sealing assembly; 51: Guide sleeve; 52: Dustproof 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 wire; 63: Piston sealing ring; 64: Second guide ring;
[0025] 7: Connecting seat; 8: Bushing. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0027] like Figures 1 to 4 As shown, the height-adjusting hydraulic cylinder for a coal mining machine of this utility model includes 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 hydraulic driving force. The piston rod sealing assembly 5 is located at the end of the cylinder body 3 and is slidably connected to the piston rod 2, used to seal the piston rod 2 at the end of the cylinder body 3 and provide sliding for the piston rod 2. The piston assembly 6 is located at the end of the piston rod 2 and is slidably connected to the cylinder body 3, used to seal the cylinder body 3 at the end of the piston rod 2 and provide sliding for the cylinder body 3. The connecting seat 7 is welded to the middle of the cylinder body 3. The bushing 8 is respectively fitted into the hinge 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 balance valve assembly 43, and a hydraulic pipeline 44. The balance valve assembly 43 is fixed to the piston rod 2 by bolts. The upper guard plate 41 is located on the upper side of the balance valve assembly 43 to protect the upper side of the balance valve assembly 43. The lower guard plate 42 is located on the lower side of the balance valve assembly 43 to protect the lower side of the balance valve assembly 43. The hydraulic pipeline 44 is located on the balance valve assembly 43 and is used to supply oil to the cylinder 3.
[0029] Furthermore, in the height adjustment cylinder for the coal mining machine of this utility model, the piston rod sealing assembly 5 includes a guide sleeve 51, a dustproof 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 dustproof ring 52 is nested in the front end of the inner wall of the guide sleeve 51, the first iron wire 53 is nested in 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 near 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 adjustment cylinder for the coal mining machine of this utility model, the inner diameter of the guide sleeve 51 is equal to the outer diameter of the piston rod 2. 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 to the outer wall of the piston rod 2 through the dustproof ring 52 and the piston sealing gasket 55. Thus, 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 dustproof ring 52. At the same time, it is sealed through the piston sealing gasket 55 to prevent hydraulic oil leakage.
[0031] Furthermore, in the height adjustment cylinder for the coal mining machine of this utility model, 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 through the first iron wire 53. The outer wall of the guide sleeve 51 is sealed to the inner wall of the cylinder body 3 through the O-ring 56 and the retaining ring 57, thereby limiting the guide sleeve 51 to the cylinder body 3 through the first iron wire 53, preventing the guide sleeve 51 from coming off when the cylinder body 3 moves. The guide sleeve 51 forms a seal with the cylinder body 3 through the O-ring 56 and the retaining ring 57, preventing hydraulic oil leakage.
[0032] Furthermore, in the height adjustment cylinder for the coal mining machine of this utility model, 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 on both sides near the piston sealing ring 63.
[0033] Furthermore, in the height adjustment cylinder for the coal mining machine of this utility model, 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. The outer wall of the piston sleeve 61 is sealed to the inner wall of the cylinder body 3 through the piston sealing ring 63. Thus, 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. The piston sleeve 61 forms a seal with the cylinder body 3 through the piston sealing ring 63, preventing hydraulic oil leakage.
[0034] Furthermore, in the height adjustment cylinder for the coal mining machine of this utility model, the inner diameter of the piston sleeve 61 is equal to the outer diameter of the piston rod 2. The piston sleeve 61 is fixedly connected to the piston rod 2 by the second iron wire 62, thereby limiting the piston sleeve 61 to the piston rod 2 by the second iron wire 62, thus 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 adjustment cylinder for the coal mining machine of this utility model, one end of the hydraulic pipeline 44 is connected to the output end of the balance valve group 43, and the other end of the hydraulic pipeline 44 passes through the piston rod 2 and communicates with the inside of the cylinder body 3. This allows the hydraulic oil to be processed by the balance valve group 43 and then enter the space between the cylinder body 3 and the piston rod 2 through the hydraulic pipeline 44 to provide a pushing force to the cylinder body 3 or the piston rod 2, thereby reducing the processing difficulty and meeting the usage requirements.
[0036] Specifically, during use, hydraulic oil is processed by the balance valve assembly 43 and then enters the space between the cylinder body 3 and the piston rod 2 through the hydraulic pipeline 44 to provide a pushing 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, which is fixed on the cylinder body 3 by the first wire 53, slides along the piston rod 2 through the first guide ring 54. Meanwhile, the piston sleeve 61, which is fixed on the piston rod 2 by the second 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 extension and retraction length of the cylinder body 3 is achieved by controlling the hydraulic oil through the balance valve assembly 43.
[0037] In summary, compared with the prior art, the height adjustment cylinder for coal mining machines of this utility model has the following advantages and beneficial effects: This utility model has a simple structure and is easy to disassemble and assemble. The cylinder function is achieved by the cooperation of the piston rod and the cylinder body and by using hydraulic pipelines to fill the cylinder body with oil, thereby reducing the processing difficulty and meeting the design and usage requirements, thus reducing the processing difficulty, improving production efficiency, and saving production costs.
[0038] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. 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 a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely 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 "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer 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 this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A height adjustment cylinder for a coal mining machine, characterized in that, The height-adjusting cylinder for the coal mining machine includes 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 disposed at the end of the cylinder body and slidably connected to the piston rod, sealing the piston rod at the end of the cylinder body and providing sliding for the piston rod. The piston assembly is disposed at the end of the piston rod and slidably connected to the cylinder body, sealing the cylinder body at 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. The bushings are respectively fitted into the hinge holes of the fixed seat and the connecting seat, wherein: The hydraulic system includes an upper guard plate, a lower guard plate, a balance valve assembly, and hydraulic pipelines. The balance valve assembly is fixed to the piston rod by bolts. The upper guard plate is located on the upper side of the balance valve assembly to protect the upper side of the balance valve assembly. The lower guard plate is located on the lower side of the balance valve assembly to protect the lower side of the balance valve assembly. The hydraulic pipelines are located on the balance valve assembly to supply oil to the cylinder.
2. The height adjustment cylinder for a coal mining machine according to claim 1, characterized in that, The piston rod sealing assembly includes a guide sleeve, a dust seal, a first wire, a first guide ring, a piston gasket, an O-ring, and a retaining ring. The dust seal is nested in the front end of the inner wall of the guide sleeve, the first wire is nested in the front end of the outer wall of the guide sleeve, the piston 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 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 a 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 sealed to the outer wall of the piston rod through the dustproof ring and the piston sealing gasket.
4. The height adjustment cylinder for a 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. The guide sleeve is fixedly connected to the cylinder body through the first iron wire. The outer wall of the guide sleeve is sealed to the inner wall of the cylinder body through the O-ring and the retaining ring.
5. The height adjustment cylinder for a coal mining machine according to claim 1, characterized in that, The piston assembly includes a piston sleeve, a second wire, a piston sealing ring, and a second guide ring. The second 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 on both sides near the piston sealing ring.
6. The height adjustment cylinder for a 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. The piston sleeve is slidably connected to the cylinder through the second guide ring. The outer wall of the piston sleeve abuts and seals against the inner wall of the cylinder through the piston sealing ring.
7. The height adjustment cylinder for a 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 by the second iron wire.
8. The height adjustment cylinder for a coal mining machine according to claim 1, characterized in that, One end of the hydraulic pipe is connected to the output end of the balance valve group, and the other end of the hydraulic pipe passes through the piston rod and communicates with the inside of the cylinder.