CN216948499U - Bushing of hydraulic breaking hammer - Google Patents

Abstract

The utility model provides a bushing of a hydraulic breaking hammer, and belongs to the technical field of hydraulic breaking hammers. The hydraulic breaking hammer solves the technical problems that the quantity of grease between a bush and a drill rod of the existing hydraulic breaking hammer is small, friction loss is large and the like. This hydraulic breaking hammer's bush includes pipy main part, is equipped with annular oil feed tank on the internal perisporium of main part, is provided with two at least inlet ports along its circumference interval on the periphery wall of main part, inlet port and oil feed tank intercommunication are equipped with a plurality of curved butter grooves on the internal perisporium of main part, and adjacent butter groove end to end sets up or alternately sets up, and the oil feed tank sets up with the main part is coaxial, and tie point or the intersect of butter groove have at least two to be located the oil feed tank. According to the drill rod grease storage device, the oil inlet groove and the grease groove are additionally formed in the inner peripheral wall of the bushing, grease is injected into the gap between the bushing and the drill rod through the oil inlet groove, the grease amount of the inner wall of the bushing is increased, the grease groove can store part of grease, the grease loss is reduced, and the grease can be more uniformly distributed.

Description

Bushing of hydraulic breaking hammer

Technical Field

The utility model belongs to the technical field of hydraulic breaking hammers, and particularly relates to a bushing of a hydraulic breaking hammer.

Background

The front cylinder body assembly of the hydraulic breaking hammer generally comprises a front cylinder body, a bushing and a drill rod, wherein the bushing comprises an outer sleeve and an inner sleeve which are sequentially arranged from front to back, the outer sleeve and the inner sleeve are in interference fit with the inner peripheral wall of the front cylinder body, the rear portion of the drill rod sequentially penetrates through the outer sleeve and the inner sleeve, and the drill rod can slide relative to the outer sleeve and the inner sleeve and can reciprocate in the front-rear direction.

At present, the inner circumferential surface of the existing bushing is a smooth surface, and because the fit clearance between the drill rod and the bushing is not large, grease can only reach the inner wall of the bushing through a small clearance, which causes uneven grease distribution on the inner wall of the bushing and less grease amount, causes larger friction force between the drill rod and the bushing, and increases the friction loss between the drill rod and the bushing; when the hydraulic breaking hammer works or has a rest, the front end of the front cylinder body faces downwards, grease can flow out from the front side of the outer sleeve under the action of gravity, the quantity of the grease on the inner wall of the bushing is further reduced, the friction force between the drill rod and the bushing is further increased, and the friction loss is increased.

How to increase the amount of grease between the bush and the drill rod and reduce the grease loss becomes a technical problem which needs to be solved urgently.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a bush which can increase the amount of grease between the bush and a drill rod and reduce grease loss.

The purpose of the utility model can be realized by the following technical scheme:

a bushing for a hydraulic demolition hammer, comprising a tubular body, characterized in that: be equipped with annular oil feed tank on the internal perisporium of main part, be provided with two at least inlet ports along its circumference interval on the periphery wall of main part, inlet port and inlet port intercommunication, be equipped with a plurality of curved butter grooves on the internal perisporium of main part, adjacent butter groove end to end sets up or cross arrangement, the inlet port sets up with the main part is coaxial, the tie point or the crosspoint of butter groove have two at least to be located on the inlet port.

The liner of the hydraulic breaking hammer is additionally provided with the oil inlet groove and the grease groove on the inner peripheral wall, grease is injected into a gap between the liner and the drill rod through the oil inlet groove, the grease amount of the inner wall of the liner is increased, and the grease groove is designed to store part of grease, reduce grease loss and enable the grease to be distributed more uniformly; furthermore, the design that at least two connecting points or intersection points of the plurality of arc-shaped grease grooves and the grease grooves are located on the grease inlet grooves enables grease in the grease inlet grooves to flow into the grease inlet grooves firstly and then spread to the periphery through the grease inlet grooves, so that the grease in the gap between the drill rod and the bush is distributed more uniformly.

In the above bushing of a hydraulic breaking hammer, each grease groove connection point or intersection point located on the oil inlet groove is communicated with an oil inlet hole.

Above-mentioned design makes can be more after the inlet port gets into the oil feed tank more flow in the butter groove to all be full of oil feed tank and butter groove, further improve the even degree that the butter distributes in drill rod and the bush clearance and the butter quantity of packing, be favorable to making drill rod and bush can abundant lubrication, reduced the friction loss of drill rod and bush, increased the life of drill rod and bush.

In the bushing of the hydraulic breaking hammer, the section of the oil inlet groove is rectangular.

Above-mentioned rectangular cross-section's oil feed tank not only can increase the quantity that the oil feed tank held the butter, the structure of rectangle can also reduce the butter and flow from the border of oil feed tank, make the oil feed tank mainly play a guide effect, more butter gets into the butter inslot that communicates with it through the oil feed tank, rethread butter groove flows in the clearance of drill rod and bush, it is more even to make the butter distribute, be favorable to making the lubrication that drill rod and bush can be abundant, the friction loss of drill rod and bush has been reduced, the life of drill rod and bush has been increased.

In the above bushing of a hydraulic breaking hammer, the cross section of the oil groove is arc-shaped.

Above-mentioned arc cross-section's butter groove can make the butter more convenient flow from the border of butter groove, be in operating condition when the quartering hammer, when the bush is vertical setting, the butter can not be piled up in the arc cross-section's butter groove, all butter homoenergetic flows from the border of butter groove, can in time supply the butter to the clearance in when the butter is insufficient in bush and drill rod clearance, make the lubrication that drill rod and bush can be abundant, the friction loss of drill rod and bush has been reduced, the life of drill rod and bush has been increased.

In foretell hydraulic breaking hammer's bush, the butter groove has two pairs, and every pair of butter groove all includes two first butter grooves and two second butter grooves, the middle part cross arrangement of two first butter grooves forms the X style of calligraphy, and the middle part cross arrangement of two second butter grooves forms the X style of calligraphy, and the both ends of two first butter grooves communicate and form the tie point with the both ends of the second butter groove that corresponds respectively, and adjacent tie point communicates in two pairs of butter grooves.

The structure of the grease groove can enable grease in the gap between the drill rod and the bushing to be distributed more uniformly, the drill rod and the bushing can be sufficiently lubricated by the design, the friction loss of the drill rod and the bushing is reduced, and the service life of the drill rod and the bushing is prolonged.

In foretell hydraulic breaking hammer's bush, the bush includes overcoat and endotheca, the overcoat is installed in the front portion of preceding cylinder body, the endotheca is installed in the rear portion of preceding cylinder body, the diameter of the internal perisporium of overcoat is all the same from the front to the back, the internal perisporium of endotheca includes sliding part, connecting portion and the throat that sets gradually from the past backward, the diameter of throat is less than the diameter of sliding part and cooperatees with the rear portion of drill rod, connecting portion are used for connecting sliding part and throat, the diameter of connecting portion diminishes from the past backward gradually, oil inlet tank, inlet port and the butter groove on the endotheca are all located on the sliding part.

Friction is not generated between the drill rod and the connecting part and the necking part of the inner sleeve in the process of advancing or sliding the drill rod, so that excessive grease is placed on the connecting part and the necking part to cause waste, and only a small part of grease is needed; furthermore, because the connecting part of the inner sleeve can collide with the rear part of the drill rod, the design of the grease groove, the oil inlet hole and the oil inlet groove can reduce the structural strength of the connecting part of the inner sleeve on the contrary, and the service life of the inner sleeve is influenced; therefore, the oil inlet groove, the oil inlet hole and the grease groove on the inner sleeve are arranged on the sliding part in the scheme, so that a better lubricating effect can be achieved, and the structural strength of the inner sleeve can be ensured; the sliding part is the part of the inner sleeve which mainly generates sliding friction with the drill rod, so that the oil inlet groove, the oil inlet hole and the grease groove are arranged on the sliding part, the amount of grease between the sliding part and the drill rod can be increased, the friction loss between the sliding part and the outer side wall of the drill rod is reduced, and the service life of the drill rod and the inner sleeve is prolonged.

In foretell hydraulic breaking hammer's bush, the oil feed tank is located between two pairs of grease grooves, adjacent tie point is located the oil feed tank in two pairs of grease grooves, the inlet port communicates with the tie point that is located the oil feed tank.

The oil inlet groove and the grease groove are designed to be more suitable for the outer sleeve, the oil inlet groove is positioned in the middle of the outer sleeve or at the position close to the back of the middle of the outer sleeve, grease can be supplemented to the grease grooves on the front side and the rear side of the oil inlet groove through the oil inlet groove, grease can be distributed more uniformly in the gap between the drill rod and the outer sleeve, the drill rod and the outer sleeve can be fully lubricated, the friction loss between the drill rod and the outer sleeve is reduced, and the service life of the drill rod and the outer sleeve is prolonged.

In the above bushing for a hydraulic breaking hammer, the number of the oil inlet holes is four, the four oil inlet holes are arranged in an annular array by taking the central axis of the oil inlet groove as the center, and two of the oil inlet holes are communicated with a connection point in the oil inlet groove.

The design of above-mentioned four inlet ports can make the oil feed more even to make the butter in the oil feed tank distribute more evenly, further, make the distribution of butter between bush and the drill rod more even, make drill rod and bush can be abundant lubricated, reduced the friction loss of drill rod and bush, increased the life of drill rod and bush.

In a aforesaid bush of hydraulic breaking hammer, the oil feed tank is located the rear portion of main part, the oil feed tank with locate the main part rear side this to the intersect intercommunication of butter groove, the inlet port with be located the intersect intercommunication of oil feed tank.

The design of the oil inlet groove and the grease groove is more suitable for the inner sleeve, the connecting part and the necking part are arranged at the rear part of the inner sleeve, and the grease groove or the oil inlet groove is not suitable to be arranged in the connecting part and the necking part, so the oil inlet groove and the grease groove can only be arranged on the sliding part positioned at the front part of the inner sleeve, the oil inlet groove is communicated with the cross point of the grease groove pair arranged at the rear side of the main body, the oil inlet groove can be positioned at the back, grease for partially keeping basic lubrication can be provided for the connecting part and the necking part on the basis of ensuring that the sliding part can be made into grease, the grease distribution between the inner sleeve and the drill rod is more uniform, the drill rod and the inner sleeve can be fully lubricated, the friction loss of the drill rod and the inner sleeve is reduced, and the service life of the drill rod and the inner sleeve is prolonged.

In the above bushing for a hydraulic quartering hammer, there are four oil inlets, and the four oil inlets are arranged in an annular array with the central axis of the oil inlet groove as the center, and two of the four oil inlets are communicated with the cross point located in the oil inlet groove.

The design of the four oil inlet holes can enable oil inlet to be more uniform, so that grease in the oil inlet groove is more uniformly distributed, further, the grease between the bush and the drill rod is more uniformly distributed, the drill rod and the bush are fully lubricated, the friction loss of the drill rod and the bush is reduced, and the service life of the drill rod and the bush is prolonged.

Compared with the prior art, the utility model has the technical effects that:

the liner of the hydraulic breaking hammer is additionally provided with the oil inlet groove and the grease groove on the inner peripheral wall, grease is injected into a gap between the liner and the drill rod through the oil inlet groove, the grease amount of the inner wall of the liner is increased, and the grease groove is designed to store part of grease, reduce grease loss and enable the grease to be distributed more uniformly; furthermore, the design that at least two connecting points or intersection points of the plurality of arc-shaped grease grooves and the grease grooves are located on the grease inlet grooves enables grease in the grease inlet grooves to flow into the grease inlet grooves firstly and then spread to the periphery through the grease inlet grooves, so that the grease in the gap between the drill rod and the bush is distributed more uniformly.

Drawings

FIG. 1 is a cross-sectional view of the front cylinder assembly of the present invention.

Fig. 2 is a schematic view of the mounting structure of the present invention.

Figure 3 is a perspective view of the outer cover of the present invention.

Figure 4 is a cross-sectional view of the jacket of the present invention.

Fig. 5 is a perspective view of the inner sleeve of the present invention.

Fig. 6 is a cross-sectional view of the inner sleeve of the present invention.

In the figure, 1, main body; 11. an oil inlet groove; 12. an oil inlet hole; 13. a yellow oil groove; 131. a first yellow oil groove; 132. a second oil groove; 14. a connection point; 15. an intersection point; 2. a jacket; 3. an inner sleeve; 31. a sliding part; 32. a connecting portion; 33. shrinking the neck part; 4. a front cylinder body; 5. a drill rod.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

This hydraulic breaking hammer's bush includes pipy main part 1, be equipped with annular oil feed tank 11 on the internal perisporium of main part 1, be provided with two at least inlet ports 12 along its circumference interval on the external peripheral wall of main part 1, inlet port 12 and oil feed tank 11 intercommunication, be equipped with a plurality of curved butter grooves 13 on the internal perisporium of main part 1, adjacent butter groove 13 end to end sets up or the cross arrangement, oil feed tank 11 and the coaxial setting of main part 1, tie point 14 or the crosspoint 15 of butter groove 13 have at least two to be located on oil feed tank 11. The oil inlet groove 11 and the grease groove 13 are additionally arranged on the inner peripheral wall of the bushing of the hydraulic breaking hammer, grease is injected into a gap between the bushing and the drill rod 5 through the oil inlet groove 11, the grease amount of the inner wall of the bushing is increased, and the grease groove 13 is designed to store part of grease, reduce grease loss and enable the grease to be distributed more uniformly; furthermore, the design that at least two of the connecting points 14 or the intersection points 15 of the plurality of arc-shaped grease grooves 13 and the grease grooves 13 are positioned on the grease inlet groove 11 can enable grease in the grease inlet groove 11 to flow into the grease groove 13 firstly and then spread to the periphery through the grease grooves 13, so that the grease in the gap between the drill rod 5 and the bush is distributed more uniformly, the drill rod 5 and the bush are fully lubricated by the design, the friction loss of the drill rod 5 and the bush is reduced, and the service life of the drill rod 5 and the bush is prolonged.

Further, each connecting point 14 or intersection 15 of the yellow oil grooves 13 on the oil inlet groove 11 is communicated with the oil inlet hole 12. The design enables more grease to flow into the grease groove 13 after entering the grease groove 11 from the grease inlet hole 12, so that the grease groove 11 and the grease groove 13 are full of grease, the uniformity of grease distribution and the amount of grease filled in the gap between the drill rod 5 and the bush are further improved, the drill rod 5 and the bush are lubricated sufficiently, the friction loss of the drill rod 5 and the bush is reduced, and the service life of the drill rod 5 and the bush is prolonged.

As shown in fig. 3 to 4, the oil feed groove 11 has a rectangular cross section; the section of the yellow oil groove 13 is arc-shaped. The oil inlet groove 11 with the rectangular cross section can increase the amount of grease contained in the oil inlet groove 11, and the rectangular structure can reduce the grease flowing out from the edge of the oil inlet groove 11, so that the oil inlet groove 11 mainly plays a role in guiding, more grease enters the grease groove 13 communicated with the oil inlet groove 11 through the oil inlet groove 11 and flows into a gap between the drill rod 5 and the bush through the grease groove 13, the grease is distributed more uniformly, the drill rod 5 and the bush are lubricated fully, the friction loss of the drill rod 5 and the bush is reduced, and the service life of the drill rod 5 and the bush is prolonged; above-mentioned arc cross-section's butter groove 13 can make the butter more conveniently flow from the border of butter groove 13, be in operating condition when the quartering hammer, when the bush is vertical setting, the butter can not be piled up in arc cross-section's butter groove 13, all butter homoenergetic are flowed from the border of butter groove 13, can in time supply the butter to the clearance in when the butter is insufficient in bush and drill rod 5 clearance, make drill rod 5 and bush can be abundant lubricated, the friction loss of drill rod 5 and bush has been reduced, the life of drill rod 5 and bush has been increased.

Further, there are two pairs of butter grooves 13, each pair of butter grooves 13 all includes two first butter grooves 131 and two second butter grooves 132, and the middle part of two first butter grooves 131 is crossing to be set up and is formed the X style of calligraphy, and the middle part of two second butter grooves 132 is crossing to be set up and is formed the X style of calligraphy, and the both ends of two first butter grooves 131 communicate with the both ends of the second butter groove 132 that corresponds respectively and form tie point 14, and adjacent tie point 14 communicates in two pairs of butter grooves 13. The structure of the grease groove 13 can enable grease in the gap between the drill rod 5 and the bush to be distributed more uniformly, the drill rod 5 and the bush can be lubricated fully by the design, the friction loss of the drill rod 5 and the bush is reduced, and the service life of the drill rod 5 and the bush is prolonged.

As shown in fig. 1 to 6, the bushing includes an outer sleeve 2 and an inner sleeve 3, the outer sleeve 2 is installed at the front portion of the front cylinder 4, the inner sleeve 3 is installed at the rear portion of the front cylinder 4, the inner peripheral wall of the outer sleeve 2 has the same diameter from front to rear, the inner peripheral wall of the inner sleeve 3 includes a sliding portion 31, a connecting portion 32 and a necking portion 33 which are sequentially arranged from front to rear, the diameter of the necking portion 33 is smaller than that of the sliding portion 31 and is matched with the rear portion of the drill rod 5, the connecting portion 32 is used for connecting the sliding portion 31 and the necking portion 33, the diameter of the connecting portion 32 is gradually reduced from front to rear, and the oil inlet groove 11, the oil inlet hole 12 and the grease groove 13 on the inner sleeve 3 are all arranged on the sliding portion 31. During the forward movement or sliding process of the drill rod 5, friction is not generated between the drill rod and the connecting part 32 and the neck part 33 of the inner sleeve 3, so that excessive grease placed on the connecting part 32 and the neck part 33 is wasted, and only a small part of grease is needed; further, since the connecting portion 32 of the inner sleeve 3 collides with the rear portion of the drill rod 5, the design of the grease groove 13, the oil inlet hole 12 and the oil inlet groove 11 may reduce the structural strength of the connecting portion 32 of the inner sleeve 3, which may affect the service life of the inner sleeve 3; therefore, in the scheme, the oil inlet groove 11, the oil inlet hole 12 and the yellow oil groove 13 on the inner sleeve 3 are all arranged on the sliding part 31, so that not only can a better lubricating effect be achieved, but also the structural strength of the inner sleeve 3 can be ensured; the sliding part 31 is a part of the inner sleeve 3 which mainly generates sliding friction with the drill rod 5, so that the arrangement of the oil inlet groove 11, the oil inlet hole 12 and the grease groove 13 on the sliding part 31 can increase the amount of grease between the sliding part 31 and the drill rod 5, is beneficial to reducing the friction loss between the sliding part 31 and the outer side wall of the drill rod 5, and prolongs the service life of the drill rod 5 and the inner sleeve 3.

As shown in fig. 3 and 4, the oil inlet groove 11 is disposed between two pairs of oil grooves 13, adjacent connection points 14 of the two pairs of oil grooves 13 are located in the oil inlet groove 11, and the oil inlet hole 12 is communicated with the connection points 14 located in the oil inlet groove 11; the number of the oil inlet holes 12 is four, the four oil inlet holes 12 are arranged in an annular array by taking the central axis of the oil inlet groove 11 as the center, and two of the oil inlet holes 12 are communicated with a connecting point 14 located in the oil inlet groove 11.

The design of the oil inlet groove 11 and the grease groove 13 is more suitable for the outer sleeve 2, so that the oil inlet groove 11 is positioned in the middle of the outer sleeve 2 or at the position close to the middle of the outer sleeve 2, grease can be supplemented to the grease grooves 13 on the front side and the rear side of the oil inlet groove 11 through the oil inlet groove 11, grease can be distributed more uniformly in a gap between the drill rod 5 and the outer sleeve 2, the drill rod 5 and the outer sleeve 2 can be fully lubricated, the friction loss between the drill rod 5 and the outer sleeve 2 is reduced, and the service lives of the drill rod 5 and the outer sleeve 2 are prolonged; the design of the four oil inlet holes 12 can make the oil inlet more uniform, so that the grease in the oil inlet groove 11 is more uniformly distributed, further, the grease between the bush and the drill rod 5 is more uniformly distributed, the drill rod 5 and the bush are sufficiently lubricated, the friction loss between the drill rod 5 and the bush is reduced, and the service lives of the drill rod 5 and the bush are prolonged.

As shown in fig. 5 and 6, the oil feed groove 11 is provided at the rear of the main body 1, the oil feed groove 11 communicates with the intersection 15 of the pair of grease sumps 13 provided at the rear side of the main body 1, and the oil feed hole 12 communicates with the intersection 15 located in the oil feed groove 11; the number of the oil inlet holes 12 is four, the four oil inlet holes 12 are arranged in an annular array by taking the central axis of the oil inlet groove 11 as the center, and two of the oil inlet holes 12 are communicated with a cross point 15 positioned in the oil inlet groove 11.

The above-mentioned design of oil feed tank 11 and grease groove 13 is more suitable for the inner race 3, because the rear portion of the inner race 3 has joint part 32 and neck 33, and the joint part 32 and neck 33 are not suitable to set up the grease groove 13 or oil feed tank 11, therefore the oil feed tank 11 and grease groove 13 can only locate at the anterior sliding part 31 of the inner race 3, and connect the oil feed tank 11 with the cross point 15 to the grease groove 13 located in the rear side of body 1, can make the oil feed tank 11 lean against, can provide the grease that part keeps the basic lubrication for joint part 32 and neck 33 on the basis of guaranteeing the grease that the sliding part 31 has, make the distribution of grease between drill rod 5 and inner sleeve 3 more uniform, make drill rod 5 and inner sleeve 3 get with the abundant lubrication, has reduced the friction loss of drill rod 5 and inner sleeve 3, have increased the service life of drill rod 5 and inner sleeve 3; the design of the four oil inlet holes 12 can make the oil inlet more uniform, so that the grease in the oil inlet groove 11 is more uniformly distributed, further, the grease between the bush and the drill rod 5 is more uniformly distributed, the drill rod 5 and the bush are sufficiently lubricated, the friction loss between the drill rod 5 and the bush is reduced, and the service lives of the drill rod 5 and the bush are prolonged.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes in the structure, shape and principle of the utility model are intended to be covered by the protection scope of the utility model as defined in the appended claims.

Claims (10)

1. A bushing of a hydraulic breaking hammer, comprising a tubular body (1), characterized in that: be equipped with annular oil feed tank (11) on the internal perisporium of main part (1), be provided with two at least inlet ports (12) along its circumference interval on the periphery wall of main part (1), inlet port (12) and oil feed tank (11) intercommunication, be equipped with a plurality of curved grease grooves (13) on the internal perisporium of main part (1), adjacent grease groove (13) end to end sets up or cross arrangement, oil feed tank (11) and main part (1) coaxial setting, tie point (14) or crosspoint (15) of grease groove (13) have at least two to be located on oil feed tank (11).

2. A bushing for a hydraulic demolition hammer as claimed in claim 1, wherein: and each connecting point (14) or intersection (15) of the yellow oil grooves (13) positioned on the oil inlet grooves (11) is communicated with an oil inlet hole (12).

3. A bushing for a hydraulic demolition hammer as defined in claim 1 wherein: the section of the oil inlet groove (11) is rectangular.

4. A bushing for a hydraulic demolition hammer as claimed in claim 1, wherein: the section of the grease groove (13) is arc-shaped.

5. A bushing for a hydraulic demolition hammer as claimed in any one of claims 1 to 4, wherein: the grease groove (13) have two pairs, and every pair grease groove (13) all includes two first grease grooves (131) and two second grease grooves (132), the middle part cross arrangement of two first grease grooves (131) forms the X style of calligraphy, and the middle part cross arrangement of two second grease grooves (132) forms the X style of calligraphy, and the both ends of two first grease grooves (131) communicate and form tie point (14) with the both ends of the second grease groove (132) that corresponds respectively, and adjacent tie point (14) communicate in two pairs of grease grooves (13).

6. A bushing for a hydraulic demolition hammer as defined in claim 5 wherein: the bush includes overcoat (2) and endotheca (3), install in the front portion of preceding cylinder body (4) overcoat (2), install in the rear portion of preceding cylinder body (4) endotheca (3), the diameter of the internal perisporium of overcoat (2) is all the same from the front to the back, the internal perisporium of endotheca (3) includes sliding part (31), connecting portion (32) and necking part (33) that set gradually from the past backward, the diameter of necking part (33) is less than the diameter of sliding part (31) and cooperatees with the rear portion of drill rod (5), connecting portion (32) are used for connecting sliding part (31) and necking part (33), the diameter of connecting portion (32) diminishes gradually from the past back, oil feed tank (11), inlet port (12) and butter groove (13) on endotheca (3) are all located on sliding part (31).

7. A bushing for a hydraulic demolition hammer as claimed in claim 5, wherein: oil feed tank (11) are located between two pairs of grease grooves (13), adjacent tie point (14) are located oil feed tank (11) in two pairs of grease grooves (13), inlet port (12) and tie point (14) intercommunication that are located oil feed tank (11).

8. The bushing of a hydraulic demolition hammer as defined in claim 7 wherein: the four oil inlet holes (12) are arranged in an annular array mode by taking the central axis of the oil inlet groove (11) as the center, and the two oil inlet holes (12) are communicated with connection points (14) located in the oil inlet groove (11).

9. A bushing for a hydraulic demolition hammer as claimed in claim 5, wherein: the rear portion of main part (1) is located in oil feed tank (11), oil feed tank (11) and this intersect (15) intercommunication to butter groove (13) of locating main part (1) rear side, inlet port (12) and intersect (15) intercommunication that are located in oil feed tank (11).

10. A bushing for a hydraulic demolition hammer as claimed in claim 9, wherein: the oil inlet holes (12) are four, the four oil inlet holes (12) are arranged in an annular array by taking the central axis of the oil inlet groove (11) as the center, and two of the oil inlet holes (12) are communicated with cross points (15) located in the oil inlet groove (11).

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