Anti-snapping breaking hammer and hydraulic breaking hammer

Abstract

The present application belongs to the technical field of hydraulic breaking hammer, and provides a middle cylinder assembly of anti-pulling breaking hammer and a hydraulic breaking hammer, the middle cylinder assembly of anti-pulling breaking hammer comprises a cylinder body and a piston, the cylinder body is internally provided with an inner cavity, the inner cavity is divided into a middle cylinder middle diameter section and a middle cylinder small diameter section, the diameter of the middle cylinder middle diameter section is larger than that of the middle cylinder small diameter section; the piston is divided into a piston middle section and a piston lower section, the diameter of the piston middle section is larger than that of the piston lower section, the piston middle section is in sliding fit with the middle cylinder middle diameter section, and the piston lower section is in sliding fit with the middle cylinder small diameter section. The inner wall of the middle cylinder middle diameter section or the side wall of the piston middle section is a conical surface, the inner wall of the middle cylinder small diameter section or the side wall of the piston lower section is a conical surface, the side wall of the piston middle section forms linear contact with the inner wall of the middle cylinder middle diameter section after the piston is deflected by a radial force, and the side wall of the piston lower section forms linear contact with the inner wall of the middle cylinder small diameter section. The hydraulic breaking hammer comprises the above-mentioned middle cylinder assembly of anti-pulling breaking hammer.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic breaker technology, specifically relating to a breaker cylinder assembly for preventing pull damage 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, leading to scratches on the piston or cylinder. Summary of the Invention

[0005] This invention provides a scratch-resistant hydraulic breaker cylinder assembly and a hydraulic breaker, aiming to solve the technical problem that the cylinder assembly of existing hydraulic breakers is prone to oil film failure, which leads to scratches on the piston or cylinder.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an anti-strain damage cylinder assembly for a hydraulic breaker, comprising:

[0007] In a first aspect, embodiments of the present invention provide an anti-strain hydraulic breaker cylinder assembly, comprising:

[0008] The cylinder body has an internal cavity, which is divided into a middle cylinder diameter section and a middle cylinder small diameter section. The diameter of the middle cylinder diameter section is larger than the diameter of the middle cylinder small diameter section, and the middle cylinder small diameter section is located on the lower side of the middle cylinder diameter section.

[0009] A piston is slidably disposed within the inner cavity. The piston is divided into a middle section and a lower section. The diameter of the middle section is larger than that of the lower section. The middle section slides with the middle diameter section of the cylinder, and the lower section slides with the small diameter section of the cylinder.

[0010] Wherein, 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, 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.

[0011] In conjunction with the first aspect, in one possible implementation of the anti-strain hydraulic breaker cylinder assembly provided by the present invention, 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.

[0012] In conjunction with the first aspect, in one possible implementation of the anti-strain hydraulic breaker cylinder assembly provided by the present invention, 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.

[0013] In conjunction with the first aspect, in one possible implementation of the anti-strain hydraulic breaker cylinder assembly provided by the present invention, 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 side wall of the middle section of the piston is a conical surface, the side wall of the lower section of the piston is a cylindrical surface, 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 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.

[0014] In conjunction with the first aspect, in one possible implementation of the anti-strain hydraulic breaker cylinder assembly provided by the present invention, the gap between the cylinder body and the piston is 0.06~0.15mm.

[0015] In conjunction with the first aspect, in one possible implementation of the anti-tear-damage hydraulic breaker cylinder assembly provided by the present invention, 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.

[0016] In conjunction with the first aspect, in one possible implementation of the anti-tear-damage hydraulic breaker cylinder assembly provided by the present invention, a molybdenum disulfide coating is further included, wherein the molybdenum disulfide coating is applied to the inner wall of the inner cavity with a thickness of 0.005~0.01mm.

[0017] In conjunction with the first aspect, in one possible implementation of the anti-tear breaker cylinder assembly provided by the present invention, a transition layer is further included, wherein the transition layer is coated between the inner wall of the inner cavity and the molybdenum disulfide coating, and the thickness is 0.005~0.01mm.

[0018] Secondly, embodiments of the present invention provide a hydraulic breaker, including the aforementioned anti-scratching breaker cylinder assembly.

[0019] The beneficial effects of the anti-scraping hydraulic breaker cylinder assembly and hydraulic breaker provided by this invention are as follows: Compared with the prior art, the anti-scraping hydraulic breaker cylinder assembly and hydraulic breaker provided by this invention, in order to avoid damage to the piston caused by lateral offset force, break away from the traditional high-precision cylindricity thinking and set a cylinder or piston with a tapered shape. According to the piston deflection shape, the inner wall of the middle diameter section of the cylinder or the side wall of the middle section of the piston is machined into a tapered 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 also machined into a tapered surface. In this way, after the piston is offset, the previous point contact becomes line contact, which effectively reduces the pressure in the contact area, effectively reduces the probability of oil film rupture, and thus effectively reduces the occurrence of scratches. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the cylinder assembly of an existing hydraulic breaker.

[0021] Figure 2 A cross-sectional view of the anti-tear damage hydraulic breaker cylinder assembly provided in an embodiment of the present invention;

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Cylinder block; 11. Inner cavity; 111. Intermediate diameter section of the intermediate cylinder; 112. Small diameter section of the intermediate cylinder;

[0024] 12. Transition layer; 13. Molybdenum disulfide coating; 21. Piston middle section; 22. Piston lower section. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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 should not be construed as limiting the scope of protection of this invention.

[0032] In traditional hydraulic breakers, both the inner cavity of the cylinder and the piston are cylindrical structures of equal diameter. During research on scratches in hydraulic breakers, the applicant discovered that, for example… Figure 1 As 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 is highlighted in bold for better visibility) experiences significant localized pressure, which can easily damage the oil film and cause scratches at the corresponding location. To address this, the applicant has developed the anti-scratching hydraulic breaker cylinder assembly and hydraulic breaker provided by this invention.

[0033] Please refer to the following: Figure 2The anti-strain breaker cylinder assembly provided by the present invention will now be described. The anti-strain breaker cylinder assembly includes a cylinder body 10 and a piston. The cylinder body 10 has an inner cavity 11, which is divided into a middle diameter section 111 and a small diameter section 112. The diameter of the middle diameter section 111 is larger than the diameter of the small diameter section 112, and the small diameter section 112 is located below the middle diameter section 111. The piston is slidably disposed in the inner cavity 11. The piston is divided into a middle section 21 and a lower section 22. The diameter of the middle section 21 is larger than the diameter of the lower section 22. The middle section 21 is slidably engaged with the middle diameter section 111, and the lower section 22 is slidably engaged with the small diameter section 112.

[0034] Among them, 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. 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.

[0035] The beneficial effects of the anti-strain damage hydraulic breaker cylinder assembly provided by this invention are as follows: Compared with the prior art, the anti-strain damage hydraulic breaker cylinder assembly provided by this invention, in order to avoid damage to the piston caused by lateral offset force, breaks away from the traditional high-precision cylindricity thinking and sets a cylinder body 10 or piston 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.

[0036] like Figure 2 As shown, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder assembly provided in this invention, 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.

[0037] 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.

[0038] Furthermore, in a specific embodiment of the anti-strain hydraulic breaker cylinder assembly provided in this invention, the inner walls of the middle diameter section 111 and the small diameter section 112 of the cylinder are cylindrical, and the side walls of the piston middle section 21 and the piston lower section 22 are conical. 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 line contact with the inner wall of the middle diameter section 111 of the cylinder, and the side wall of the piston lower section 22 forms line contact with the inner wall of the small diameter section 112 of the cylinder.

[0039] Furthermore, in a specific embodiment of the anti-strain hydraulic breaker cylinder assembly provided in this invention, 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.

[0040] 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.

[0041] 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.

[0042] When the piston wobbles, its cylindrical surfaces (piston middle section 21 and piston lower section 22) form line contact with the corresponding conical cylinder wall 10 (middle diameter section 111 and small diameter section 112). 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 effectively reduces 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 prone to crushing or damage. The continued existence of the oil film is the fundamental guarantee for avoiding direct metal-to-metal contact and preventing surface scoring.

[0043] like Figure 2As shown, in a specific embodiment of the anti-scraping hydraulic breaker cylinder assembly provided in this invention, 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.

[0044] like Figure 2 As shown, in a specific embodiment of the anti-tear-damage hydraulic breaker cylinder assembly provided in this invention, the sum of the tapers of the cylinder middle diameter section 111 and the piston middle section 21 is 0.000036~0.000056.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] like Figure 2 As shown, in a specific embodiment of the anti-tear breaker cylinder assembly provided in this invention, a molybdenum disulfide coating 13 is also included. The molybdenum disulfide coating 13 is coated on the inner wall of the inner cavity 11 with a thickness of 0.005~0.01mm.

[0050] like Figure 2 As shown, in a specific embodiment of the anti-tear damage hydraulic breaker cylinder assembly provided in this invention, a transition layer 12 is further included. The transition layer 12 is coated between the inner wall of the inner cavity 11 and the molybdenum disulfide coating 13, and has a thickness of 0.005~0.01mm.

[0051] 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.

[0052] 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.

[0053] 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:

[0054] 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.

[0055] 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℃.

[0056] 3. No hydrogen embrittlement: Dacromet's processing technology ensures that Dacromet does not exhibit hydrogen embrittlement, making it ideal for coating load-bearing components.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] It should be noted that a molybdenum disulfide coating 13 is applied to the surface of the inner cavity 11 of the cylinder block 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 further prevent piston or cylinder scratches. Furthermore, a transition layer 12 is applied between the molybdenum disulfide coating 13 and the surface of the inner cavity 11. While preventing corrosion, it effectively improves the adhesion strength of the molybdenum disulfide coating 13, prevents the molybdenum disulfide coating 13 from falling off, and further reduces the probability of piston or cylinder scratches.

[0061] Based on the same inventive concept, embodiments of the present invention provide a hydraulic breaker, including the aforementioned anti-tear breaker cylinder assembly.

[0062] The beneficial effects of the hydraulic breaker provided by this invention are as follows: Compared with the prior art, in order to avoid damage to the piston caused by lateral offset force, the hydraulic breaker provided by this invention breaks away from the traditional high-precision cylindricity thinking and sets a cylinder body 10 or piston 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 made into a tapered surface. In this way, after the piston is offset, the previous point contact becomes line contact, which effectively reduces the pressure in the contact area, effectively reduces the probability of oil film damage, and thus effectively reduces the occurrence of scoring.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pull-rupture-resistant cylinder assembly for a breaking hammer, characterized in that The application relates to a cylinder assembly of a break hammer. The cylinder body is internally provided with an inner cavity, the inner cavity is divided into a middle cylinder middle diameter section and a middle cylinder small diameter section, the diameter of the middle cylinder middle diameter section is larger than the diameter of the middle cylinder small diameter section, and the middle cylinder small diameter section is arranged at the lower side of the middle cylinder middle diameter section. The piston is slidably arranged in the inner cavity, the piston is divided into a piston middle section and a piston lower section, the diameter of the piston middle section is larger than the diameter of the piston lower section, the piston middle section is slidably matched with the middle cylinder middle diameter section, and the piston lower section is slidably matched with the middle cylinder small diameter section. The inner wall of the middle cylinder middle diameter section or the side wall of the piston middle section is a conical surface, the inner wall of the middle cylinder small diameter section or the side wall of the piston lower section is a conical surface, the side wall of the piston middle section is in linear contact with the inner wall of the middle cylinder middle diameter section after the piston is deflected by a radial force, and the side wall of the piston lower section is in linear contact with the inner wall of the middle cylinder small diameter section.

2. A pull-rupture-resistant cylinder assembly for a breaking hammer as defined in claim 1, characterized in that The inner wall of the middle cylinder middle diameter section and the middle cylinder small diameter section is a conical surface, the diameter of the middle cylinder middle diameter section gradually decreases from top to bottom, the diameter of the middle cylinder small diameter section gradually increases from top to bottom, the side wall of the piston is a cylindrical surface, the side wall of the piston middle section is in linear contact with the inner wall of the middle cylinder middle diameter section after the piston is deflected by a radial force, and the side wall of the piston lower section is in linear contact with the inner wall of the middle cylinder small diameter section.

3. A pull-rupture-resistant cylinder assembly for a breaking hammer as defined in claim 1, characterized in that The inner wall of the middle cylinder middle diameter section and the middle cylinder small diameter section is a cylindrical surface, the side wall of the piston middle section and the side wall of the piston lower section are conical surfaces, the diameter of the piston middle section gradually increases from top to bottom, and the diameter of the piston lower section gradually decreases from top to bottom; the side wall of the piston middle section is in linear contact with the inner wall of the middle cylinder middle diameter section after the piston is deflected by a radial force, and the side wall of the piston lower section is in linear contact with the inner wall of the middle cylinder small diameter section.

4. The anti-snapping breaking hammer mid-cylinder assembly of claim 1, wherein, The inner wall of the middle cylinder middle diameter section is a cylindrical surface, the inner wall of the middle cylinder small diameter section is a conical surface, and the diameter of the middle cylinder small diameter section gradually increases from top to bottom; the side wall of the piston middle section is a conical surface, the side wall of the piston lower section is a cylindrical surface, and the diameter of the piston middle section gradually increases from top to bottom; the side wall of the piston middle section is in linear contact with the inner wall of the middle cylinder middle diameter section after the piston is deflected by a radial force, and the side wall of the piston lower section is in linear contact with the inner wall of the middle cylinder small diameter section.

5. A pull-rupture-resistant cylinder assembly in a breaking hammer according to any of claims 1 - 4, characterized in that The gap between the cylinder body and the piston is 0.06-0.15 mm.

6. A rip stop breaking hammer mid-cylinder assembly as described in claim 5, wherein, The taper sum of the middle cylinder middle diameter section and the piston middle section is 0.000036-0.000056, and the taper sum of the middle cylinder small diameter section and the piston lower section is 0.0001-0.00015.

7. A pull-rupture-resistant cylinder assembly for a breaking hammer as defined in claim 1, wherein A molybdenum disulfide coating is further arranged on the inner wall of the inner cavity, and the thickness of the molybdenum disulfide coating is 0.005-0.01 mm.

8. A rip stop breaking hammer mid-cylinder assembly as described in claim 7, wherein, A transition layer is further arranged between the inner wall of the inner cavity and the molybdenum disulfide coating, and the thickness of the transition layer is 0.005-0.01 mm.

9. A hydraulic breaking hammer, characterized in that The application further relates to a break hammer middle cylinder assembly.

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