Structure for reducing pressure relief and improving efficiency for hydraulic breaking hammer
By setting up sealing grooves and sealing components in the middle cylinder and piston structure of the hydraulic breaker, the problem of hydraulic oil leakage is solved, and the efficiency of the breaker is significantly improved.
Patent Information
- Application Number
- CN202421304178.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-08
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-08
AI Technical Summary
In the hydraulic breaker, high-pressure hydraulic oil is prone to leak at the mating point between the piston and the middle cylinder, resulting in low efficiency.
A structure including a middle cylinder and a piston is designed. A sealing groove is provided on the upper front section of the middle cylinder, and a sealing assembly is provided on the lower section of the large diameter of the piston. The gap between the piston and the middle cylinder is reduced through the sealing groove and the sealing assembly to achieve sealing.
It effectively reduces the leakage of high-pressure hydraulic oil, improves the efficiency of hydraulic breaker, and reduces the cross-sectional area of leakage gap by more than 80%.
Smart Images
Figure CN222502258U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic breaker hammers, in particular to a structure for reducing pressure relief and improving efficiency for hydraulic breaker hammers. Background Art
[0002] The high-pressure oil of the excavator enters the lower oil chamber of the hydraulic breaker piston, and the piston moves upward under the push of the high-pressure oil. When the piston moves upward to the reversing oil channel, the reversing oil channel is connected to the high-pressure oil, and the high-pressure oil is passed into the reversing oil chamber of the reversing valve. Under the pressure difference caused by the area difference, the valve core moves to the other side. After moving into place, the high-pressure hydraulic oil of the valve core enters the upper oil chamber of the piston. The upper and lower oil chambers of the piston are subjected to high pressure at the same time. Because the upper end area is larger than the lower end area, the upper and lower pressure differences caused by the upper and lower area differences are generated. The thrust generated by the high-pressure oil is downward, and together with the compressed nitrogen pressure and the weight of the piston, the piston is pushed downward quickly to hammer the drill rod to break the stone. When the piston hammers the drill rod, the reversing oil channel is connected to the return oil, the high pressure in the reversing oil chamber disappears, and the valve core moves back to reset. The valve core closes the passage between the high-pressure hydraulic oil and the upper oil chamber of the piston and connects the upper oil chamber of the piston to return oil. End a working process. The hydraulic oil returns to the excavator when the piston moves upward next time.
[0003] When the hydraulic oil pushes the piston upward, a large gap must be maintained between the front section of the piston and the front section of the middle cylinder, as well as between the middle section of the piston and the middle section of the middle cylinder to ensure hydraulic oil lubrication and prevent cylinder pulling. A large gap will cause leakage of high-pressure hydraulic oil, which will lead to low efficiency of the breaker.
[0004] For this purpose, a structure for reducing pressure and improving efficiency for a hydraulic breaker is proposed. Utility Model Content
[0005] The purpose of the utility model is to solve the problems mentioned in the above background technology. The utility model provides a structure for reducing pressure relief and improving efficiency for a hydraulic breaker.
[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:
[0007] A structure for reducing pressure and improving efficiency for a hydraulic breaker includes a middle cylinder and a piston, wherein the surface of the piston is movably connected to the inner wall of the middle cylinder, a lower oil groove is provided on the inner wall of the middle cylinder, a sealing groove is provided on the front upper section of the middle cylinder, a lubrication assembly is also provided on the front of the middle cylinder, a balancing oil passage is provided on the inner wall of the middle cylinder, and a sealing assembly is provided on the large-diameter lower section of the piston.
[0008] Furthermore, the lubrication assembly includes a second low-pressure oil passage, a first low-pressure oil passage, a primary spiral groove and a secondary spiral groove, the first low-pressure oil passage and the second low-pressure oil passage both penetrate through the surface of the middle cylinder, the primary spiral groove and the secondary spiral groove are both opened on the inner wall of the middle cylinder, and the second low-pressure oil passage, the first low-pressure oil passage, the primary spiral groove and the secondary spiral groove are interconnected.
[0009] Furthermore, the sealing assembly includes a piston sealing ring, a piston sealing ring is provided between the piston sealing ring and the piston, the outer circle of the piston sealing ring contacts the inner circle of the middle cylinder, and the fitting clearance between the outer circle of the piston sealing ring and the inner circle of the middle cylinder is smaller than the fitting clearance between the outer circle of the piston and the inner circle of the middle cylinder.
[0010] Furthermore, the piston sealing ring is fixed to the outer circle of the piston and can float radially 360 degrees. A step is provided on the surface of the piston. One end face of the piston sealing ring contacts the step and is subjected to force, while the other end face is axially positioned and stopped by a sealing ring retaining ring.
[0011] Furthermore, the piston sealing ring is threadedly connected and screwed onto the piston and is stopped from rotating by a pin.
[0012] Furthermore, the piston sealing ring floats on the piston, and one end of the piston sealing ring is axially positioned by a spliced multi-piece bearing, the piston sealing ring wraps the bearing, and the other end of the piston sealing ring is axially positioned by an elastic shaft retaining ring.
[0013] The beneficial effects of the utility model are as follows:
[0014] The utility model has a sealing groove on the front upper section of the middle cylinder. After the sealing ring is installed, the gap between the front section of the piston and the front of the middle cylinder is well sealed, and the leakage of high-pressure hydraulic oil is basically zero; after the piston sealing ring is provided on the large-diameter lower section of the piston, the gap between the middle section of the piston and the middle of the middle cylinder can be greatly reduced. The internal leakage of high-pressure hydraulic oil is greatly reduced. Taking the 220 specification hydraulic breaker as an example, the gap between the front section of the piston and the front of the middle cylinder can be ignored, and the gap between the middle section of the piston and the middle of the middle cylinder can be reduced to 0.02, and the total cross-sectional area of the leakage gap is about 14mm 2 The cross-sectional area of the internal leakage gap is reduced by more than 80% compared with the conventional ones. For large-sized breaker hammers, the larger the piston diameter, the more obvious the efficiency improvement effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the structure of the middle cylinder of the utility model;
[0016] Figure 2 This is a schematic diagram of the piston structure of the utility model;
[0017] Figure 3 It is a schematic diagram of the assembly structure of the utility model;
[0018] Figure numerals: 01, middle cylinder; 01-01, lower oil groove; 01-02, primary spiral groove; 01-03, secondary spiral groove; 01-04, first low-pressure oil passage; 01-05, second low-pressure oil passage; 01-06, balance oil passage; 01-07, sealing groove; 02, piston; 0201, piston sealing ring; 0202, piston sealing ring; 0203, sealing ring retaining ring. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0022] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0023] like Figures 1 to 3As shown, a structure for reducing pressure and improving efficiency for a hydraulic breaker includes a middle cylinder 01 and a piston 02, wherein the surface of the piston 02 is movably connected to the inner wall of the middle cylinder 01, a lower oil groove 01-01 is provided on the inner wall of the middle cylinder 01, a sealing groove 01-07 is provided on the front upper section of the middle cylinder 01, a lubrication assembly is also provided on the front of the middle cylinder 01, a balancing oil passage 01-06 is provided on the inner wall of the middle cylinder 01, and a sealing assembly is provided on the large-diameter lower section of the piston 02. More specifically, the leakage of high-pressure hydraulic oil is reduced by sealing groove 01-07, and lubrication between middle cylinder 01 and piston 02 is achieved by lubrication assembly. Under working condition, high-pressure hydraulic oil enters from middle cylinder 01 to push piston 02 upward, and the gap between the front of piston 02 and the front of middle cylinder 01 is sealed by the sealing ring in sealing groove 01-07. The gap between the middle of piston 02 and the middle of middle cylinder 01 is reduced by piston sealing ring 0201 and piston sealing ring 0202 installed on piston 02. After the sealing ring at sealing groove 01-07 is sealed, the leakage of high-pressure oil from the gap is basically zero. In order to ensure the lubrication requirement between the front of piston 02 and the front of middle cylinder 01, low-pressure hydraulic oil is introduced from the first low-pressure oil passage 01-04, and discharged from the second low-pressure oil passage 01-05 after passing through the primary spiral groove 01-02 and the secondary spiral groove 01-03.
[0024] The lubrication assembly includes a second low-pressure oil passage 01-05, a first low-pressure oil passage 01-04, a primary spiral groove 01-02 and a secondary spiral groove 01-03. The first low-pressure oil passage 01-04 and the second low-pressure oil passage 01-05 are both opened through the surface of the middle cylinder 01, the primary spiral groove 01-02 and the secondary spiral groove 01-03 are both opened on the inner wall of the middle cylinder 01, and the second low-pressure oil passage 01-05, the first low-pressure oil passage 01-04, the primary spiral groove 01-02 and the secondary spiral groove 01-03 are interconnected. It should be noted that low-pressure hydraulic oil is introduced from the first low-pressure oil passage 01-04 to the primary spiral groove 01-02 and the secondary spiral groove 01-03 as lubrication between the middle cylinder 01 and the piston 02, and the hydraulic oil passes through the primary spiral groove 01-02 and the secondary spiral groove 01-03, and is finally discharged through the second low-pressure oil passage 01-05.
[0025] The sealing assembly includes a piston sealing ring 0201, a piston sealing ring 0202 is arranged between the piston sealing ring 0201 and the piston 02, the outer circle of the piston sealing ring 0201 contacts the inner circle of the middle cylinder 01, and the fitting clearance between the outer circle of the piston sealing ring 0201 and the inner circle of the middle cylinder 01 is smaller than the fitting clearance between the outer circle of the piston 02 and the inner circle of the middle cylinder 01. More specifically, the sealing effect between the piston 02 and the middle cylinder 01 is improved by the piston sealing ring 0201, and the floating support of the piston sealing ring 0201 and the sealing between the piston 02 and the piston sealing ring 0201 are realized by the piston sealing ring 0202, so as to prevent leakage of the gap between the piston 02 and the piston sealing ring 0201, wherein, after the piston sealing ring 0201 is installed, the leakage clearance is reduced, thereby achieving the purpose of reducing leakage.
[0026] The piston sealing ring 0201 is fixed to the outer circle of the piston 02 and can float radially 360 degrees. A step is provided on the surface of the piston 02. One end face of the piston sealing ring 0201 contacts the step and is subjected to force, while the other end face is axially positioned and stopped by the sealing ring retaining ring 0203.
[0027] The piston sealing ring 0201 is threadedly screwed onto the piston 02 and is stopped by a pin.
[0028] The piston sealing ring 0201 floats on the piston 02, and one end of the piston sealing ring 0201 is axially positioned by a spliced multi-piece bearing. The piston sealing ring 0201 wraps the bearing, and the other end of the piston sealing ring 0201 is axially positioned by an elastic shaft retaining ring.
[0029] In summary: For conventional breaker hammers, when the hydraulic oil pushes the piston upward, the front section of the piston and the front section of the middle cylinder, as well as the middle section of the piston and the middle section of the middle cylinder, must maintain a large gap to ensure hydraulic oil lubrication and prevent cylinder pulling. Large gaps lead to leakage of high-pressure hydraulic oil, which in turn leads to low efficiency of the breaker hammer. There is no special treatment for the leakage of high-pressure hydraulic oil in these two gaps. Taking the 220 specification hydraulic breaker hammer as an example, the average value of the gaps in these two places is 0.05mm, and the total cross-sectional area of the leakage gaps is about 80mm 2 .
[0030] The utility model has a sealing groove 01-07 set at the front upper section of the middle cylinder 01. After the sealing ring is installed, the gap between the front section of the piston 02 and the front of the middle cylinder 01 is well sealed, and the leakage of high-pressure hydraulic oil is basically zero; after the piston 02 has a piston sealing ring 0201 set at the large-diameter lower section of the piston 02, the gap between the middle section of the piston 02 and the middle of the middle cylinder 01 can be greatly reduced. The internal leakage of high-pressure hydraulic oil is greatly reduced. Taking the 220 specification hydraulic breaker as an example, the gap between the front section of the piston 02 and the front of the middle cylinder 01 can be ignored, and the gap between the middle section of the piston 02 and the middle of the middle cylinder 01 can be reduced to 0.02, and the total cross-sectional area of the leakage gap is about 14mm 2The cross-sectional area of the internal leakage gap is reduced by more than 80% compared with the conventional ones. For large-sized breaker hammers, the larger the piston diameter, the more obvious the efficiency improvement effect.
[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A structure for reducing pressure and improving efficiency for a hydraulic breaker, characterized in that: The invention comprises a middle cylinder (01) and a piston (02), wherein the surface of the piston (02) is movably plugged with the inner wall of the middle cylinder (01), the inner wall of the middle cylinder (01) is provided with a lower oil groove (01-01), the front upper section of the middle cylinder (01) is provided with a sealing groove (01-07), the front part of the middle cylinder (01) is also provided with a lubrication component, the inner wall of the middle cylinder (01) is provided with a balancing oil passage (01-06), and the large-diameter lower section of the piston (02) is provided with a sealing component.
2. The structure for reducing pressure and improving efficiency for a hydraulic breaker according to claim 1, characterized in that: The lubrication assembly comprises a second low-pressure oil passage (01-05), a first low-pressure oil passage (01-04), a first spiral groove (01-02) and a second spiral groove (01-03); the first low-pressure oil passage (01-04) and the second low-pressure oil passage (01-05) are both penetrated and opened on the surface of the middle cylinder (01); the first spiral groove (01-02) and the second spiral groove (01-03) are both opened on the inner wall of the middle cylinder (01); and the second low-pressure oil passage (01-05), the first low-pressure oil passage (01-04), the first spiral groove (01-02) and the second spiral groove (01-03) are interconnected.
3. The structure for reducing pressure and improving efficiency for a hydraulic breaker according to claim 1, characterized in that: The sealing assembly comprises a piston sealing ring (0201), a piston sealing ring (0202) is provided between the piston sealing ring (0201) and the piston (02), the outer circle of the piston sealing ring (0201) contacts the inner circle of the middle cylinder (01), and the fitting clearance between the outer circle of the piston sealing ring (0201) and the inner circle of the middle cylinder (01) is smaller than the fitting clearance between the outer circle of the piston (02) and the inner circle of the middle cylinder (01).
4. The structure for reducing pressure and improving efficiency for a hydraulic breaker according to claim 3, characterized in that: The piston sealing ring (0201) is fixed to the outer circle of the piston (02) and can float radially 360 degrees. The surface of the piston (02) is provided with a step. One end face of the piston sealing ring (0201) is in contact with the step to bear force, and the other end face is axially positioned and stopped by the sealing ring retaining ring (0203).
5. The structure for reducing pressure and improving efficiency for a hydraulic breaker according to claim 3, characterized in that: The piston sealing ring (0201) is threadedly screwed onto the piston (02) and is stopped from rotating by a pin.
6. The structure for reducing pressure and improving efficiency for a hydraulic breaker according to claim 3, characterized in that: The piston sealing ring (0201) floats on the piston (02), and one end of the piston sealing ring (0201) is axially positioned by a spliced multi-piece bearing. The piston sealing ring (0201) wraps the bearing, and the other end of the piston sealing ring (0201) is axially positioned by an elastic shaft retaining ring.