1. The utility model provides a novel switching-over valve structure for hydraulic pressure quartering hammer, includes valve barrel (1), case (2), well cylinder (3) and piston (4), its characterized in that: be equipped with piston (4) in well jar (3), rear end is equipped with valve barrel (1) in well jar (3), valve barrel (1) precision ring cover is on piston (4), be equipped with case (2) between valve barrel (1) and well jar (3), case (2) precision ring cover is between valve barrel (1) and well jar (3) rear end, case (2) and valve barrel (1) and well jar (3) sliding connection, case (2) are along valve barrel (1) and well jar (3) surface radial sliding.

2. The new reversing valve structure for a hydraulic demolition hammer as claimed in claim 1, characterized by: equal precision fit between valve barrel (1), case (2), well jar (3) and piston (4), valve barrel (1) internal diameter has three oil blanket notches (11) and one atmoseal notch (14) in piston (4) rear end precision fit, the notch of oil blanket notch (11) and atmoseal notch (14) all is towards piston (4), valve barrel (1) external diameter is equipped with one atmoseal notch (14) with well jar (3) rear end junction.

3. The new reversing valve structure for a hydraulic demolition hammer as claimed in claim 1, characterized by: and a sealing ring groove (15) is arranged between the outer surface of the valve sleeve (1) and the middle cylinder (3).

4. A new reversing valve structure for a hydraulic breaking hammer according to claim 1 or 2, characterized in that: the oil seal is characterized in that circular oil passing holes (12) are uniformly formed in the middle section of the valve sleeve (1), a certain angle is formed between each oil passing hole (12) and the circumferential surface of the valve sleeve (1), and circular oil discharging holes (13) are uniformly formed between the notches (11) of the oil seal.

5. The new reversing valve structure for a hydraulic demolition hammer as claimed in claim 1, characterized by: the oil injection valve is characterized in that a circular main oil hole (21) is uniformly formed in the valve core (2), a circular oil return hole (22) is uniformly formed in one side of an oil injection hole in the valve core (2), and a certain angle is formed between the oil return hole (22) and the circumferential surface of the valve core (2).

Background

The hydraulic breaking hammer has the characteristic of high-power impact vibration, and is widely applied to the fields of metallurgy, mines, railways, highways, buildings, municipal construction, house development and the like. Compared with the traditional pneumatic impact machine, the hydraulic breaking hammer has the advantages of large impact power, high working efficiency, energy conservation, consumption reduction, low noise, good construction performance and the like. The working principle of the reversing valve of the hydraulic breaking hammer is that a main machine supplies pressure to a front-end pressure cavity, a piston rises to a reversing oil duct, the reversing valve reverses, high-pressure oil enters the rear end of the piston, the force bearing area of the rear end of the piston is larger than that of the front end of the piston, the piston moves downwards under the action of pressure difference and nitrogen pressure, at the moment, hydraulic oil in an oil cavity at the front end of the piston rapidly moves into the oil cavity at the rear end of the piston through the reversing valve, the moving speed of the piston is determined by the speed of the hydraulic oil in the oil cavity at the front end of the piston moving into the oil cavity at the rear end, and the hydraulic oil throughput of the reversing valve plays a key role, so that the reversing valve is the most core component of the hydraulic breaking hammer. However, the reversing valve of the current hydraulic breaking hammer has the following defects: in the field of large-size breaking hammers, an external reversing valve is generally used, the structure of the external reversing valve consists of a valve body, a valve core, a valve sleeve and an oil way, the oil way is matched in a limited volume, and the sizes of the valve core and the valve sleeve of the reversing valve cannot be large enough to match the reversing hydraulic oil flow rate of the larger-size breaking hammer, so that the reversing stroke of the reversing valve is generally increased, the time required by the reversing process is increased, and the problem that the breaking hammer rebounds and shakes seriously is solved; if the stroke of the reversing valve is not lengthened, the flow rate of the reversing hydraulic oil is insufficient, the impact force of the breaking hammer is weak, the impact force of the breaking hammer cannot be increased in proportion with the increase of the model of the breaking hammer, even the impact force is not increased, and the flow rate of the hydraulic oil cannot be increased by lengthening the reversing stroke of the reversing valve after the breaking hammer develops into a certain large model, so that the hydraulic breaking hammer is prevented from being developed into a larger model; the rebound force of the breaking hammer can cause the main engine to move up and down, and can seriously damage the main engine structure when serious, such as cracking and breaking of a movable arm of the main engine, early abrasion of a rotary turntable and the like; the shaking of the main machine can cause faults of different degrees to the engine, a hydraulic system and electric devices. The rebound phenomenon of the breaking hammer is that after a piston impacts a drill rod when the breaking hammer works, a reversing valve is not reversed in time, because an object is hard, the breaking hammer continues to push a lower support forward under the action of oil pressure and nitrogen at the rear end of the piston to lift the whole breaking hammer, so that the drill rod is separated from a support inner sleeve, after the reversing valve finishes reversing, the piston rises back, an oil cavity at the rear end of the piston is communicated with an oil return channel, the pressure disappears, the breaking hammer returns to a drill rod supporting force point again under the action of a main machine and the self gravity, and the movement happens repeatedly, so that the rebound phenomenon of up-and-down movement is formed. Therefore, a novel reversing valve structure of the hydraulic breaking hammer with large flow and short reversing stroke is needed to be provided.

Disclosure of Invention

The invention aims to solve the technical problem of providing a novel reversing valve structure for a hydraulic breaking hammer, which has the advantages of large flow, short reversing stroke, simple structure, safety, reliability and high working efficiency.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a novel switching-over valve structure for hydraulic breaking hammer, includes valve barrel, case, well jar and piston, be equipped with the piston in the well jar, the rear end is equipped with the valve barrel in the well jar, the accurate ring cover of valve barrel is on the piston, be equipped with the case between valve barrel and the well jar, the accurate ring cover of case is between valve barrel and well jar rear end, case and valve barrel and well jar sliding connection, the case is along valve barrel and well jar surface radial sliding.

As an improvement, the valve sleeve, the valve core, the middle cylinder and the piston are all precisely matched, the inner diameter of the valve sleeve is precisely matched with three oil seal notches and one air seal notch at the rear end of the piston, the oil seal notch and the air seal notch are both towards the piston, the oil seal notch seals oil pressure in a rear-end oil cavity, the air seal notch seals air pressure of a rear cylinder body nitrogen chamber, the outer diameter of the valve sleeve is provided with one air seal notch at the joint with the rear end of the middle cylinder, and the air seal notch is used for sealing the air pressure of the rear cylinder body nitrogen chamber; the weight that the quartering hammer struck power received the piston influences with the speed when hammering downwards, and the structure of above-mentioned switching-over valve makes the diameter of switching-over valve increase along with the increase of piston diameter to have sufficient logical oil volume and ensure the velocity of flow behind the hydraulic oil trades, internal resistance when to a great extent reduces the quartering hammer downstream, guarantee the speed of quartering hammer down hammering, and then guarantee the striking power of quartering hammer, thereby can continue the quartering hammer of development bigger model.

As an improvement, a sealing ring groove is arranged between the outer surface of the valve sleeve and the middle cylinder, so that the sealing ring is convenient to position, and the sealing effect is ensured.

As an improvement, the middle section of the valve sleeve is uniformly provided with circular oil passing holes, the oil passing holes form a certain angle with the circumferential surface of the valve sleeve, circular oil discharging holes are uniformly arranged between the notches of the oil seal, the circular oil passing holes and the circular oil discharging holes are favorable for improving the hydraulic oil passing area of the reversing valve, the flow velocity of the hydraulic oil after reversing is improved, the short reversing stroke work of the reversing valve is realized, and the stability of the work of the hydraulic breaking hammer and the improvement of the striking force are favorable.

As an improvement, the valve core is uniformly provided with a circular main oil hole, one side of the oil injection hole on the valve core is uniformly provided with a circular oil return hole, the oil return hole and the circumferential surface of the valve core form a certain angle, the circular main oil hole and the circular oil return hole are favorable for improving the hydraulic oil passing area of the reversing valve, one side of the circular main oil hole on the valve core is uniformly provided with the circular oil return hole, the valve core and the valve sleeve have a skillful optimized structure, and the diameter of the valve sleeve and the diameter of the valve core of the reversing valve of the traditional breaking hammer are multiple times larger, so that the circumferential surface is multiple times longer, and the circumferential surface is provided with the dense main oil holes, so that the flow velocity of the hydraulic oil after reversing is improved, the short reversing stroke work of the reversing valve is realized, and the stability of the work of the hydraulic breaking hammer and the improvement of the striking force are favorable.

Compared with the prior art, the invention has the advantages that: according to the novel reversing valve structure for the hydraulic breaking hammer, through structural integration optimization, a valve core and a valve sleeve of the reversing valve and an oil seal fixer are integrated into a whole, so that the reversing valve can be enlarged along with the increase of the size of a piston, and the model of the breaking hammer can be enlarged and developed continuously; due to the ingenious design of the reversing valve, the reversing valve has a large enough diameter, so that hydraulic oil can be passed through by a large enough amount, and the reversing valve can be set to work in a short reversing stroke, so that after a piston impacts a drill rod, the reversing time of a breaking hammer is shorter, the operation of the breaking hammer is more stable, the shaking of a main machine is reduced to a great extent, and a digging machine structural frame, a hydraulic system and the like are protected; because the diameter of the reversing valve is large, the area of hydraulic oil passing through the circumferential surface is large, the internal consumption caused by internal resistance when the piston strikes downwards is reduced to a great extent, and then the striking force of the breaking hammer is increased. Drawings

Fig. 1 is a schematic sectional structure diagram of a reversing valve of a hydraulic breaking hammer in an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a valve body and a valve core of the reversing valve in the embodiment of the invention.

Fig. 3 is a schematic structural diagram of a reversing valve body in the embodiment of the invention.

Fig. 4 is a schematic structural diagram of a valve core of the reversing valve in the embodiment of the invention.

Reference numerals: 1. a valve housing; 11. an oil seal notch; 12. an oil passing hole; 13. an oil discharge hole; 14. a gas seal notch; 15. a seal ring groove; 2. a valve core; 21. a main oil hole; 22. an oil return hole; 3. a middle cylinder; 4. a piston.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in the figure, a novel switching-over valve structure for hydraulic breaking hammer, including valve barrel 1, case 2, well jar 3 and piston 4, be equipped with piston 4 in the well jar 3, the rear end is equipped with valve barrel 1 in the well jar 3, the accurate ring cover of valve barrel 1 is on piston 4, be equipped with case 2 between valve barrel 1 and the well jar 3, the accurate ring cover of case 2 is between valve barrel 1 and the 3 rear ends of well jar, case 2 and valve barrel 1 and well jar 3 sliding connection, case 2 is along valve barrel 1 and the 3 surface radial sliding of well jar.

All the precise coordination between valve bush 1, valve core 2, well jar 3 and the piston 4, valve bush 1 internal diameter has three oil blanket notches 11 and one atmoseal notch 14 in the precise coordination of piston 4 rear end, the notch of oil blanket notch 11 and atmoseal notch 14 all faces piston 4, valve bush 1 external diameter is equipped with one atmoseal notch 14 with 3 rear end junctions of well jar.

And a sealing ring groove 15 is arranged between the outer surface of the valve sleeve 1 and the middle cylinder 3.

The middle section of the valve sleeve 1 is uniformly provided with circular oil passing holes 12, the oil passing holes 12 and the circumferential surface of the valve sleeve 1 form a certain angle, and circular oil discharging holes 13 are uniformly arranged between the oil seal notches 11.

The valve core 2 is uniformly provided with a circular main oil hole 21, one side of the oil injection hole on the valve core 2 is uniformly provided with a circular oil return hole 22, and the oil return hole 22 and the circumferential surface of the valve core 2 form a certain angle.

Example one

As shown in fig. 1-4, the novel reversing valve structure for the hydraulic breaking hammer of the present embodiment is composed of a valve sleeve, a valve core, a middle cylinder and a piston; the valve bush is embedded in the middle cylinder and close to the rear cylinder, and the valve bush ring wraps the piston; the valve core is arranged between the valve sleeve and the middle cylinder, and the valve core ring covers the valve sleeve and can slide along the radial direction of the outer surface of the valve sleeve.

The valve sleeve, the valve core, the middle cylinder and the piston are all precisely matched, and the inner diameters of the valve sleeve and the valve core are larger than the diameter of the piston and encircle the rear end of the piston. The valve sleeve is provided with a plurality of annular oil seal notches close to the end part of the rear cylinder, the number of the oil seal notches is 4, and the oil seal notches face the piston and are precisely matched with the piston.

A circle of circular large-diameter oil passing holes are tightly arranged in the valve sleeve along the circumference, an angle of 75 degrees is formed between the circular oil passing holes and the circumference surface of the valve sleeve, and a plurality of circular oil unloading holes are arranged between the notches of the oil seal along the circumference. The valve core is tightly provided with a circle of round main oil hole with large diameter along the circumference, the other side of the valve core is provided with a circle of a plurality of round oil return holes along the circumference, and the round oil return holes and the circumferential surface of the valve core form an angle of 60 degrees.

Example two

As shown in fig. 1-4, the novel reversing valve structure for the hydraulic breaking hammer of the present embodiment is composed of a valve sleeve, a valve core, a middle cylinder and a piston; the valve bush is embedded in the middle cylinder and close to the rear cylinder, and the valve bush ring wraps the piston; the valve core is arranged between the valve sleeve and the middle cylinder, and the valve core ring covers the valve sleeve and can slide along the radial direction of the outer surface of the valve sleeve.

The valve sleeve, the valve core, the middle cylinder and the piston are all precisely matched, and the inner diameters of the valve sleeve and the valve core are larger than the diameter of the piston and encircle the rear end of the piston. The valve sleeve is provided with a plurality of annular oil seal notches close to the end part of the rear cylinder, the number of the oil seal notches is 3, and the oil seal notches face the piston and are precisely matched with the piston.

A circle of circular large-diameter oil passing holes are tightly arranged in the valve sleeve along the circumference, the circular oil passing holes are vertical to the circumference surface of the valve sleeve, and a plurality of circular oil unloading holes are arranged between the notches of the oil seal along the circumference. The valve core is tightly provided with a circle of round major diameter main oil hole along the circumference, the other side of the valve core is provided with a circle of a plurality of round oil return holes along the circumference, and the round oil return holes are vertical to the circumference surface of the valve core.

EXAMPLE III

As shown in fig. 1-4, the novel reversing valve structure for the hydraulic breaking hammer of the present embodiment is composed of a valve sleeve, a valve core, a middle cylinder and a piston; the valve bush is embedded in the middle cylinder and close to the rear cylinder, and the valve bush ring wraps the piston; the valve core is arranged between the valve sleeve and the middle cylinder, and the valve core ring covers the valve sleeve and can slide along the radial direction of the outer surface of the valve sleeve.

The valve sleeve, the valve core, the middle cylinder and the piston are all precisely matched, and the inner diameters of the valve sleeve and the valve core are larger than the diameter of the piston and encircle the rear end of the piston. The valve sleeve is provided with a plurality of annular oil seal notches close to the end part of the rear cylinder, the number of the oil seal notches is 4, and the oil seal notches face the piston and are precisely matched with the piston.

A circle of circular large-diameter oil passing holes are tightly arranged in the valve sleeve along the circumference, the circular oil passing holes and the circumference surface of the valve sleeve form an angle of 60 degrees, and a plurality of circular oil unloading holes are arranged between the notches of the oil seal along the circumference. The valve core is tightly provided with a circle of round main oil hole with large diameter along the circumference, the other side of the valve core is provided with a circle of a plurality of round oil return holes along the circumference, and the round oil return holes and the circumferential surface of the valve core form an angle of 60 degrees.

The present invention and its embodiments have been described, without limitation, and the embodiments shown in the drawings are only one embodiment of the present invention and the actual configuration is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.