Anti-injury breaking hammer, middle cylinder, middle cylinder assembly and hydraulic breaking hammer
By coating the inner surface of the hydraulic breaker cylinder with a molybdenum disulfide coating and a transition layer, and by adopting a tapered piston and cylinder design, the problem of scratches on the hydraulic breaker cylinder or piston is solved, achieving better lubrication and corrosion protection, and reducing the risk of scratches.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUAIBEI XINNIAOJIN MACHINERY EQUIPMENT CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-12
AI Technical Summary
The cylinder or piston of existing hydraulic breakers is prone to scratches, mainly due to oil film failure.
A molybdenum disulfide coating is applied to the inner surface of the cylinder, and a transition layer is applied between the molybdenum disulfide coating and the inner surface. The transition layer is used to improve the adhesion strength of the molybdenum disulfide coating. At the same time, the piston and cylinder are designed with a tapered sliding fit structure to reduce scratches caused by piston wobble.
It effectively reduces scratches on the piston or cylinder after oil film failure, improves the adhesion strength of the molybdenum disulfide coating, reduces the probability of scratches on the piston or cylinder, and enhances the lubrication effect.
Smart Images
Figure CN224351303U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of hydraulic breaker technology, specifically relating to a breaker cylinder that prevents damage from pulling, a cylinder assembly, and a hydraulic breaker. Background Technology
[0002] A hydraulic breaker is an engineering device that uses hydraulic energy to drive and convert the pressure energy of hydraulic oil into mechanical impact energy. Its main function is to be installed at the end of the arm of construction machinery such as excavators, and use the high-frequency impact force generated by the internal piston to drive the chisel to violently impact hard and brittle materials such as rocks and concrete, so as to achieve efficient crushing, demolition or excavation operations. It is widely used in mining, construction, road maintenance and other fields.
[0003] Its core structure consists of: a hydraulic system (high-pressure oil circuit and return oil circuit) that provides power source; an impact mechanism (middle cylinder, piston, control valve) that converts hydraulic energy into piston reciprocating motion; a chisel (working part) that directly transmits impact force to the object being crushed; a housing (front cylinder and rear cylinder) that houses the internal mechanism and provides mounting interfaces; and, in some models, an accumulator (nitrogen chamber) that enhances impact force, etc., working together.
[0004] In this process, the piston reciprocates within the cylinder, impacting the chisel to break it. Currently, lubrication between the piston and cylinder relies primarily on an oil film, which is prone to failure. This failure can lead to scratches on the piston or cylinder. Utility Model Content
[0005] This utility model provides a scratch-resistant hydraulic breaker cylinder, cylinder assembly, and hydraulic breaker, aiming to solve the technical problem that the cylinder or piston of existing hydraulic breakers is prone to scratches.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] In a first aspect, this utility model embodiment provides a cylinder for an anti-strain hydraulic breaker, comprising:
[0008] The cylinder body has an inner cavity for sliding cooperation with the piston.
[0009] A transition layer is applied to the surface of the inner cavity;
[0010] A molybdenum disulfide coating is applied to the surface of the transition layer.
[0011] In conjunction with the first aspect, in one possible implementation of the anti-tear-damage hydraulic breaker cylinder provided by this utility model, the thickness of the transition layer is 0.005~0.01mm.
[0012] In conjunction with the first aspect, in one possible implementation of the anti-tear breaker cylinder provided by this utility model, the thickness of the molybdenum disulfide coating is 0.005~0.01mm.
[0013] Secondly, this utility model embodiment provides an anti-strain hydraulic breaker cylinder assembly, including the aforementioned anti-strain hydraulic breaker cylinder and piston. The inner cavity is divided into a middle diameter section and a small diameter section, the diameter of the middle diameter section being larger than the diameter of the small diameter section, and the small diameter section being located below the middle diameter section. The piston is divided into a middle section and a lower section, the diameter of the middle section being larger than the diameter of the lower section, the middle section slidingly engaging with the middle diameter section, and the lower section slidingly engaging with the small diameter section.
[0014] In conjunction with the second aspect, in one possible implementation of the anti-tear-damage hydraulic breaker cylinder assembly provided by this utility model, the inner wall of the middle diameter section of the cylinder or the side wall of the middle section of the piston is a conical surface, the inner wall of the small diameter section of the cylinder or the side wall of the lower section of the piston is a conical surface, and after the piston is deflected by radial force, the side wall of the middle section of the piston forms a line contact with the inner wall of the middle diameter section of the cylinder, and the side wall of the lower section of the piston forms a line contact with the inner wall of the small diameter section of the cylinder.
[0015] In conjunction with the second aspect, in one possible implementation of the anti-tear-damage hydraulic breaker cylinder assembly provided by this utility model, the inner walls of the middle diameter section and the small diameter section of the middle cylinder are conical surfaces, and the diameter of the middle diameter section gradually decreases from top to bottom, while the diameter of the small diameter section gradually increases from top to bottom; the piston sidewall is a cylindrical surface; after the piston is deflected by radial force, the sidewall of the middle section of the piston forms line contact with the inner wall of the middle diameter section of the middle cylinder, and the sidewall of the lower section of the piston forms line contact with the inner wall of the small diameter section of the middle cylinder.
[0016] In conjunction with the second aspect, in one possible implementation of the anti-strain hydraulic breaker cylinder assembly provided by this utility model, the inner walls of the middle diameter section and the small diameter section of the cylinder are cylindrical surfaces, the side walls of the middle section of the piston and the lower section of the piston are conical surfaces, and the diameter of the middle section of the piston gradually decreases from top to bottom, while the diameter of the lower section of the piston gradually increases from top to bottom; after the piston is deflected by radial force, the side wall of the middle section of the piston forms line contact with the inner wall of the middle diameter section of the cylinder, and the side wall of the lower section of the piston forms line contact with the inner wall of the small diameter section of the cylinder.
[0017] In conjunction with the second aspect, in one possible implementation of the anti-strain hydraulic breaker cylinder assembly provided by this utility model, the inner wall of the middle diameter section of the cylinder is a cylindrical surface, the inner wall of the small diameter section of the cylinder is a conical surface, and the diameter of the small diameter section of the cylinder gradually increases from top to bottom; the middle section of the piston has a conical sidewall, the lower section of the piston has a cylindrical sidewall, and the diameter of the middle section of the piston gradually increases from top to bottom; after the piston is deflected by radial force, the sidewall of the middle section of the piston forms a line contact with the inner wall of the middle diameter section of the cylinder, and the sidewall of the lower section of the piston forms a line contact with the inner wall of the small diameter section of the cylinder.
[0018] In conjunction with the second aspect, in one possible implementation of the anti-scraping hydraulic breaker cylinder assembly provided by this utility model, the gap between the cylinder body and the piston is 0.06~0.15mm; the sum of the tapers of the middle diameter section of the cylinder and the middle section of the piston is 0.000036~0.000056, and the sum of the tapers of the small diameter section of the cylinder and the lower section of the piston is 0.0001~0.00015.
[0019] Thirdly, this utility model embodiment provides a hydraulic breaker, including the aforementioned anti-tear breaker cylinder assembly.
[0020] The beneficial effects of the anti-scratching hydraulic breaker cylinder, cylinder assembly, and hydraulic breaker provided by this utility model are as follows: Compared with the prior art, the anti-scratching hydraulic breaker cylinder, cylinder assembly, and hydraulic breaker provided by this utility model have a molybdenum disulfide coating on the inner surface of the cylinder body. The molybdenum disulfide coating has a good self-lubricating effect, which can effectively reduce the situation of piston or cylinder scratches caused by oil film failure; and a transition layer is coated between the molybdenum disulfide coating and the inner surface of the cavity, which not only prevents corrosion but also effectively improves the adhesion strength of the molybdenum disulfide coating, avoids the molybdenum disulfide coating from falling off, and further reduces the probability of piston or cylinder scratches. Attached Figure Description
[0021] Figure 1 This is a cross-sectional view of the cylinder assembly of an existing hydraulic breaker.
[0022] Figure 2 A cross-sectional view of the anti-tear damage hydraulic breaker cylinder assembly provided in an embodiment of this utility model;
[0023] Explanation of reference numerals in the attached figures:
[0024] 10. Cylinder block; 11. Inner cavity; 111. Intermediate diameter section of the intermediate cylinder; 112. Small diameter section of the intermediate cylinder;
[0025] 12. Transition layer; 13. Molybdenum disulfide coating; 21. Piston middle section; 22. Piston lower section. Detailed Implementation
[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0030] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0031] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.
[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0033] Please refer to the following: Figure 2 The anti-strain breaker cylinder provided by this utility model will now be described. The anti-strain breaker cylinder includes a cylinder body 10, a transition layer 12, and a molybdenum disulfide coating 13. The cylinder body 10 is provided with an inner cavity 11, which is used to slide with the piston. The transition layer 12 coats the surface of the inner cavity 11. The molybdenum disulfide coating 13 is coated on the surface of the transition layer 12.
[0034] It should be noted that an existing surface treatment process is used to generate a transition layer 12 on the inner wall of the cylinder 10 inner cavity 11, which has anti-corrosion properties and can improve surface adhesion. While providing anti-corrosion, it also improves surface adhesion. Then, a molybdenum disulfide coating 13 is coated on the surface of the transition layer 12 to provide good self-lubricating properties.
[0035] The transition layer 12 is a phosphate layer obtained by surface phosphate treatment, which has good anti-corrosion ability and can effectively increase surface adhesion and prevent molybdenum disulfide coating from falling off.
[0036] The transition layer 12 can also be a zinc-chromium coating, a new type of anti-corrosion coating mainly composed of zinc powder, aluminum powder, chromic acid, and deionized water. Its advantages include the following:
[0037] 1. Superior corrosion resistance: The Dacromet coating is only 4-8μm thick, but its rust prevention effect is 7-10 times greater than that of traditional electroplating, hot-dip galvanizing, or coating methods. Standard parts and pipe fittings treated with Dacromet technology showed no red rust after more than 1200 hours of salt spray testing.
[0038] 2. High heat resistance: Dacromet can withstand high-temperature corrosion, with a heat resistance temperature of over 300℃. In contrast, traditional galvanizing processes will peel and become unusable when the temperature reaches 100℃.
[0039] 3. No hydrogen embrittlement: Dacromet's processing technology ensures that Dacromet does not exhibit hydrogen embrittlement, making it ideal for coating load-bearing components.
[0040] 4. Good adhesion and recoating performance: Dacromet coating has good adhesion to the metal substrate and strong adhesion to other additional coatings. The treated parts are easy to spray and color, and the adhesion to organic coatings even exceeds that of phosphate film.
[0041] In addition, the transition layer 12 can also be obtained by surface treatment with silane, ceramic coating, sandblasting, etc., to improve the surface's anti-corrosion performance and adhesion.
[0042] Among them, silane treatment is an environmentally friendly metal surface treatment technology that uses organosilanes as the main raw material. It improves coating adhesion and corrosion resistance by forming a covalent bond film layer, and has advantages such as no heavy metal pollution, low energy consumption and simple process.
[0043] The beneficial effects of the anti-scratching hydraulic breaker cylinder provided by this utility model are as follows: Compared with the prior art, the anti-scratching hydraulic breaker cylinder provided by this utility model has a molybdenum disulfide coating 13 coated on the surface of the inner cavity 11 of the cylinder body 10. The molybdenum disulfide coating 13 has a good self-lubricating effect, which can effectively reduce the situation of piston or cylinder scratches caused by oil film failure; and a transition layer 12 is coated between the molybdenum disulfide coating 13 and the surface of the inner cavity 11, which not only prevents corrosion, but also effectively improves the adhesion strength of the molybdenum disulfide coating 13, avoids the molybdenum disulfide coating 13 from falling off, and further reduces the probability of piston or cylinder scratches.
[0044] like Figure 2As shown, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder provided in this utility model, the thickness of the transition layer 12 is 0.005~0.01mm.
[0045] like Figure 2 As shown, in a specific embodiment of the anti-tear damage hydraulic breaker cylinder provided in this utility model, the thickness of the molybdenum disulfide coating 13 is 0.005~0.01mm.
[0046] Based on the same inventive concept, this utility model embodiment provides a hydraulic breaker cylinder assembly for preventing damage from pulling, including the aforementioned hydraulic breaker cylinder and piston. The inner cavity 11 is divided into a cylinder middle diameter section 111 and a cylinder small diameter section 112. The diameter of the cylinder middle diameter section 111 is larger than the diameter of the cylinder small diameter section 112, and the cylinder small diameter section 112 is located below the cylinder middle diameter section 111. The piston is divided into a piston middle section 21 and a piston lower section 22. The diameter of the piston middle section 21 is larger than the diameter of the piston lower section 22. The piston middle section 21 is slidably engaged with the cylinder middle diameter section 111, and the piston lower section 22 is slidably engaged with the cylinder small diameter section 112.
[0047] The beneficial effects of the anti-scratching hydraulic breaker cylinder assembly provided by this utility model are as follows: Compared with the prior art, in the anti-scratching hydraulic breaker cylinder assembly provided by this utility model, a molybdenum disulfide coating 13 is coated on the surface of the inner cavity 11 of the cylinder body 10. The molybdenum disulfide coating 13 has a good self-lubricating effect, which can effectively reduce the situation of piston or cylinder scratches caused by oil film failure; and a transition layer 12 is coated between the molybdenum disulfide coating 13 and the surface of the inner cavity 11, which not only prevents corrosion but also effectively improves the adhesion strength of the molybdenum disulfide coating 13, avoids the molybdenum disulfide coating 13 from falling off, and further reduces the probability of piston or cylinder scratches.
[0048] like Figure 2 As shown, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder assembly provided in this utility model, the inner wall of the middle diameter section 111 of the cylinder or the side wall of the middle section 21 of the piston is a conical surface, the inner wall of the small diameter section 112 of the cylinder or the side wall of the lower section 22 of the piston is a conical surface, and after the piston is deflected by radial force, the side wall of the middle section 21 of the piston forms a line contact with the inner wall of the middle diameter section 111 of the cylinder, and the side wall of the lower section 22 of the piston forms a line contact with the inner wall of the small diameter section 112 of the cylinder.
[0049] It should be noted that, as Figure 1As shown, the piston strikes the chisel, meaning the piston's striking plane impacts the chisel's striking plane. There is usually a large gap between the inner and outer sleeves supporting the chisel and the chisel itself, especially after wear, when the gap becomes even larger. During operation, the chisel's centerline and the piston's centerline form an angle, causing the striking point to deviate from the center. In this situation, the piston generates a lateral force F, causing it to shift to the right. The lower end of the piston presses against the right side of the cylinder 10, and the cylinder 10 generates a supporting force F1 on the lower section of the piston. Under leverage, the middle section 21 of the piston presses against the left side of the cylinder 10, and the cylinder 10 generates a force F2 on the middle section 21 of the piston. In the past, during the machining of the cylinder 10 or piston components, the cylindrical surfaces of both components were controlled to achieve a high degree of cylindricity. When the piston shifts, point contact occurs inside the cylinder 10 (i.e.,...). Figure 1 The area indicated by the bolded black dot (the contact area has been bolded to make the display more obvious) experiences greater local pressure, which can easily damage the oil film and cause scratches at the corresponding location.
[0050] In the anti-strain hammer cylinder assembly provided in this embodiment of the utility model, to avoid damage to the piston caused by lateral offset force, the traditional high-precision cylindricity thinking is broken, and the cylinder body 10 or piston is made with a tapered shape. According to the piston deflection shape, the inner wall of the middle diameter section 111 of the cylinder or the side wall of the middle section 21 of the piston is machined into a tapered surface, and the inner wall of the small diameter section 112 of the cylinder or the side wall of the lower section 22 of the piston is also machined into a tapered surface. In this way, after the piston is offset, the previous point contact becomes line contact (i.e., Figure 2 The area indicated by the bolded lines (the contact area is highlighted in bold to make the display more obvious) effectively reduces the pressure at the contact point, thus reducing the chance of oil film rupture and consequently minimizing the occurrence of scratches.
[0051] Specifically, such as Figure 2 As shown, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder assembly provided in this utility model, the inner walls of the middle diameter section 111 and the small diameter section 112 of the middle cylinder are conical surfaces, and the diameter of the middle diameter section 111 gradually decreases from top to bottom, while the diameter of the small diameter section 112 gradually increases from top to bottom; the piston sidewall is a cylindrical surface; after the piston is deflected by radial force, the sidewall of the piston middle section 21 forms a line contact with the inner wall of the middle diameter section 111, and the sidewall of the piston lower section 22 forms a line contact with the inner wall of the small diameter section 112.
[0052] It should be noted that, in order to make the display effect more obvious, [the following text is incomplete and requires further context to translate accurately]. Figure 2 The taper of the middle cone surface has been exaggerated; the actual taper is much larger than that. Figure 2 The taper shown in the image is small.
[0053] Furthermore, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder assembly provided in this utility model, the inner walls of the middle diameter section 111 and the small diameter section 112 of the middle cylinder are cylindrical surfaces, and the side walls of the piston middle section 21 and the piston lower section 22 are conical surfaces. The diameter of the piston middle section 21 gradually decreases from top to bottom, and the diameter of the piston lower section 22 gradually increases from top to bottom. After the piston is deflected by radial force, the side wall of the piston middle section 21 forms a line contact with the inner wall of the middle diameter section 111 of the middle cylinder, and the side wall of the piston lower section 22 forms a line contact with the inner wall of the small diameter section 112 of the middle cylinder.
[0054] Furthermore, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder assembly provided in this utility model, the inner wall of the middle diameter section 111 of the middle cylinder is a cylindrical surface, the inner wall of the small diameter section 112 of the middle cylinder is a conical surface, and the diameter of the small diameter section 112 of the middle cylinder gradually increases from top to bottom; the side wall of the piston middle section 21 is a conical surface, the side wall of the piston lower section 22 is a cylindrical surface, and the diameter of the piston middle section gradually increases from top to bottom; after the piston is deflected by radial force, the side wall of the piston middle section 21 forms a line contact with the inner wall of the middle diameter section 111 of the middle cylinder, and the side wall of the piston lower section 22 forms a line contact with the inner wall of the small diameter section 112 of the middle cylinder.
[0055] It should be noted that all three forms can achieve the beneficial effect of fewer scratches. However, since the area and length of the middle diameter section 111 of the cylinder is greater than the area of the middle section 21 of the piston, and the area of the small diameter section 112 of the cylinder is smaller than the area of the side wall of the lower section 22 of the piston, in order to reduce the processing area, shorten the processing time, and reduce the processing difficulty, it is preferable to process the inner wall of the small diameter section 112 of the cylinder and the side wall of the middle section 21 of the piston into conical surfaces.
[0056] It should be further explained that, in addition to the three forms mentioned above, the intermediate diameter section 111 of the cylinder, the minor diameter section 112 of the cylinder, the middle section 21 of the piston, and the lower section 22 of the piston can all be machined into conical surfaces; or the intermediate diameter section 111 of the cylinder and the lower section 22 of the piston can be machined into conical surfaces, and the minor diameter section 112 of the cylinder and the middle section 21 of the piston can be machined into cylindrical surfaces, as long as the piston can form a line contact with the cylinder body after deflection.
[0057] When the piston wobbles, the piston middle section 21 and piston lower section 22 will form line contact with the corresponding cylinder middle diameter section 111 and cylinder small diameter section 112, respectively. Compared with the point contact under traditional wobble, the line contact significantly increases the contact area. This increased contact area brings a crucial advantage: it can effectively reduce the local pressure at the contact point. The lower pressure greatly reduces the pressure on the oil film in the contact area, making the oil film less likely to be crushed or damaged. The continuous existence of the oil film is the fundamental guarantee to avoid direct metal-to-metal contact and prevent surface scoring.
[0058] like Figure 2As shown in a specific embodiment of the anti-scratching hydraulic breaker cylinder assembly provided in this utility model, the gap between the cylinder body 10 and the piston is 0.06~0.15mm to ensure a balance between lubrication and sealing. Too small a gap may affect the flow of lubricating oil, leading to insufficient lubrication, while also increasing manufacturing difficulty and sensitivity to impurities. Too large a gap, in the absence of sway or with minimal sway, will cause excessive hydraulic oil leakage (internal leakage), reducing the impact efficiency of the hydraulic breaker and potentially affecting the environmental pressure required to establish an oil film.
[0059] The sum of the tapers of the middle diameter section 111 of the cylinder and the middle section 21 of the piston is 0.000036~0.000056, and the sum of the tapers of the small diameter section 112 of the cylinder and the lower section 22 of the piston is 0.0001~0.00015.
[0060] Preferably, the sum of the tapers of the middle diameter section 111 of the cylinder and the middle section 21 of the piston is 0.000046, and the sum of the tapers of the small diameter section 112 of the cylinder and the lower section 22 of the piston is 0.000125.
[0061] Specifically, when the cylinder bore section 111 is cylindrical and the piston section 21 is conical, the taper of the piston section 21 is 0.000046; when the cylinder bore section 111 is conical and the piston section 21 is cylindrical, the taper of the piston section 111 is 0.000046. When the cylinder bore section 112 is conical and the piston lower section 22 is cylindrical, the taper of the piston section 112 is 0.000125; when the cylinder bore section 112 is cylindrical and the piston lower section 22 is conical, the taper of the piston lower section 22 is 0.000125.
[0062] It should be noted that this slight taper ensures that when the piston experiences radial runout within the normal range, its side surface can precisely form a stable line contact with the corresponding side surface of the inner cavity 11 of the cylinder 10.
[0063] Based on the same inventive concept, this utility model embodiment provides a hydraulic breaker, including the above-mentioned anti-tear breaker cylinder assembly.
[0064] The beneficial effects of the hydraulic breaker provided by this utility model are as follows: Compared with the prior art, in the hydraulic breaker provided by this utility model, a molybdenum disulfide coating 13 is coated on the surface of the inner cavity 11 of the cylinder body 10. The molybdenum disulfide coating 13 has a good self-lubricating effect, which can effectively reduce the situation of piston or cylinder scratches caused by oil film failure; and a transition layer 12 is coated between the molybdenum disulfide coating 13 and the surface of the inner cavity 11, which not only prevents corrosion, but also effectively improves the adhesion strength of the molybdenum disulfide coating 13, avoids the molybdenum disulfide coating 13 from falling off, and further reduces the probability of piston or cylinder scratches.
[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A pull-rupture-resistant breaking hammer middle cylinder, characterized in that, include: The cylinder body has an inner cavity for sliding cooperation with the piston. A transition layer is applied to the surface of the inner cavity to prevent corrosion and increase surface adhesion. A molybdenum disulfide coating is applied to the surface of the transition layer.
2. A pull-rupture-resistant breaking hammer middle cylinder according to claim 1, characterized in that, The thickness of the transition layer is 0.005~0.01mm.
3. A pull-rupture-resistant split cylinder for a breaking hammer as defined in claim 1, characterized in that The thickness of the molybdenum disulfide coating is 0.005~0.01mm.
4. A type of anti-strain hydraulic breaker cylinder assembly, characterized in that, The device includes a hydraulic breaker cylinder and piston as described in any one of claims 1-3. The inner cavity is divided into a middle diameter section and a small diameter section, the diameter of which is larger than that of which is located below the middle diameter section. The piston is divided into a middle section and a lower section, the diameter of which is larger than that of which is located below the middle diameter section. The piston is slidably fitted with the middle diameter section and the lower section is slidably fitted with the small diameter section.
5. The anti-strain damage hydraulic breaker cylinder assembly as described in claim 4, characterized in that, The inner wall of the middle diameter section of the cylinder or the side wall of the middle section of the piston is a conical surface, and the inner wall of the small diameter section of the cylinder or the side wall of the lower section of the piston is a conical surface. After the piston is deflected by radial force, the side wall of the middle section of the piston forms a line contact with the inner wall of the middle diameter section of the cylinder, and the side wall of the lower section of the piston forms a line contact with the inner wall of the small diameter section of the cylinder.
6. The anti-strain damage hydraulic breaker cylinder assembly as described in claim 5, characterized in that, The inner walls of the middle diameter section and the small diameter section of the middle cylinder are conical surfaces, and the diameter of the middle diameter section gradually decreases from top to bottom, while the diameter of the small diameter section gradually increases from top to bottom; the piston sidewall is a cylindrical surface; after the piston is deflected by radial force, the sidewall of the middle section of the piston forms a line contact with the inner wall of the middle diameter section of the middle cylinder, and the sidewall of the lower section of the piston forms a line contact with the inner wall of the small diameter section of the middle cylinder.
7. The anti-strain damage hydraulic breaker cylinder assembly as described in claim 5, characterized in that, The inner walls of the middle diameter section and the small diameter section of the cylinder are cylindrical, while the side walls of the middle section and the lower section of the piston are conical. The diameter of the middle section of the piston gradually decreases from top to bottom, and the diameter of the lower section of the piston gradually increases from top to bottom. When the piston is deflected by radial force, the side wall of the middle section of the piston forms a line contact with the inner wall of the middle diameter section of the cylinder, and the side wall of the lower section of the piston forms a line contact with the inner wall of the small diameter section of the cylinder.
8. The anti-strain damage hydraulic breaker cylinder assembly as described in claim 5, characterized in that, The inner wall of the middle diameter section of the cylinder is cylindrical, and the inner wall of the small diameter section of the cylinder is conical, with the diameter of the small diameter section of the cylinder gradually increasing from top to bottom; the middle section of the piston has a conical sidewall, and the lower section of the piston has a cylindrical sidewall, with the diameter of the middle section of the piston gradually increasing from top to bottom; after the piston is deflected by radial force, the sidewall of the middle section of the piston forms a line contact with the inner wall of the middle diameter section of the cylinder, and the sidewall of the lower section of the piston forms a line contact with the inner wall of the small diameter section of the cylinder.
9. The anti-strain hydraulic breaker cylinder assembly as described in any one of claims 5-8, characterized in that, The gap between the cylinder and the piston is 0.06~0.15mm; the sum of the tapers of the middle diameter section of the cylinder and the middle section of the piston is 0.000036~0.000056, and the sum of the tapers of the small diameter section of the cylinder and the lower section of the piston is 0.0001~0.00015.
10. A hydraulic breaker, characterized in that, Includes the anti-tear-damage hydraulic breaker cylinder assembly as described in any one of claims 4-9.