Piston rod for piston hammer and piston hammer

Abstract

The invention provides a piston rod for a piston hammer and the piston hammer, the piston rod of the piston hammer comprises a piston main body section and a piston guide section which are fixedly connected, and a striking hammer head arranged at the lower end of the piston rod, and the piston main body section and / or the piston guide section are / is a polyhedral rod. An outer contact plane or an outer contact approximate plane is arranged on at least one side, deviated when the piston rod is knocked, of the outer wall of the polyhedral rod, so that the piston rod is in surface contact with a piston cylinder body of the piston hammer and / or the inner wall of the guide sleeve at least at the outer contact plane or the outer contact approximate plane; the contact area between the deviated side of the piston rod during knocking and the piston cylinder body and / or the guide sleeve is increased, the unit area pressure of the deviated side is reduced, a hydraulic oil film at the deviated side is not prone to being squeezed away by deviated knocking force, the lubrication degree of the deviated side is guaranteed, metal friction at the deviated side is greatly reduced, and the service life of the piston rod is prolonged. Abrasion of the outer wall of the piston rod and the inner wall of the piston cylinder body and / or the guide sleeve is avoided, the cylinder score phenomenon is avoided, and the hydraulic piston hammer is durable.

Description

Technical Field

[0001] The invention relates to the technical field of crushing engineering machinery, in particular to a piston rod for a piston hammer, and a piston hammer equipped with the piston rod. Background Art

[0002] At present, crushing operations are carried out on roads, buildings, mines, etc. by installing crushing equipment at the end of the excavator. Usually, the crushing equipment uses a piston hammer to knock the drill rod downward, and the drill rod hits the road, building, mine rock, etc. The piston hammer mainly includes a middle cylinder body with an oblong through hole inside, and a piston rod assembled in the middle cylinder body so as to be movable up and down. The middle cylinder body is a rectangular iron block, and the piston rod is a cylindrical iron rod; under the joint action of hydraulic oil and nitrogen, the piston rod moves up and down quickly in the middle cylinder body, and then knocks the drill rod downward to perform the crushing operation. For example: an impact-rotation crushing machine disclosed in the Chinese invention patent application with application publication number CN114622615A.

[0003] However, the hydraulic piston hammers currently on the market have a major technical defect that has not yet been solved, that is, the piston rod and the middle cylinder body produce a cylinder pulling phenomenon. This technical problem has existed for decades since the birth of the hydraulic piston hammer. Specifically, when the piston rod moves down to strike the drill rod, there will be a knocking force biased to one side. This knocking force biased to one side will inevitably cause the outer wall of the piston rod to knock the inner wall of the middle cylinder body. At this time, the piston rod is biased toward the middle cylinder body, and the outer peripheral contour of the piston rod and the inner hole of the middle cylinder body are both circular, resulting in a line contact between the two at the side where the piston rod is biased toward the middle cylinder body. The contact area is very, very small, and the unit area pressure at this place is very large. In this way, under the combined effect of the biased knocking force and the up and down movement state of the piston rod, the hydraulic oil film at the side where the piston rod is biased toward the middle cylinder body is easily squeezed away, resulting in metal friction between the outer wall of the piston rod and the inner wall of the middle cylinder body, which also causes wear of the outer wall of the piston rod and the inner wall of the middle cylinder body at this place. After the hydraulic piston hammer has been working for a period of time, the outer diameter of the piston rod becomes smaller due to wear at the side of the piston rod that is biased toward the middle cylinder body, and the diameter of the inner hole of the middle cylinder body becomes larger due to wear, which makes the contact area between the outer wall of the piston rod and the inner wall of the middle cylinder body further smaller, that is, becomes extremely small, further increasing the unit area pressure at this point. Finally, under the combined effect of the extremely small contact area, the biased knocking force, and the up and down reciprocating force, the metal friction becomes metal abrasion, and the outer wall of the piston rod and the inner wall of the middle cylinder body are severely worn, and both are changed from the original smooth mirror surface to a rough surface, that is, the cylinder pulling phenomenon occurs. Once the cylinder pulling phenomenon occurs, the iron filings that fall off due to wear are mixed in the hydraulic oil and circulate with the hydraulic oil in the hydraulic system of the hydraulic piston hammer, accelerating the speed of cylinder pulling, and finally causing the hydraulic piston hammer to fail to work. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a piston rod for a piston hammer, which effectively avoids the occurrence of cylinder pulling phenomenon.

[0005] To achieve the above-mentioned purpose, the present invention provides a piston rod for a piston hammer, comprising a piston main section and a piston guide section fixedly connected to each other, and a striking hammer head arranged at the lower end of the piston rod, wherein the piston main section and / or the piston guide section are polyhedral rods, and an outer contact plane or an outer contact approximate plane is provided on the outer wall of the polyhedral rod at least on one side to which the piston rod deflects when striking, so that the piston rod is in surface contact with the inner wall of the piston cylinder and / or the guide sleeve of the piston hammer at least at the outer contact plane or the outer contact approximate plane.

[0006] Furthermore, the piston guide section includes an upper guide rod and a lower guide rod which are fixed at the upper and lower ends of the piston main section along the axial direction of the piston rod respectively, and the striking hammer head is fixed at the lower end of the lower guide rod, and at least one of the piston main section, the upper guide rod and the lower guide rod is the polyhedral rod.

[0007] Furthermore, the cross section of the polyhedral rod is a polygon, and the outer wall of the polyhedral rod includes a plurality of planes connected end to end, one of which constitutes the outer contact plane.

[0008] Furthermore, the polyhedral rod is provided with a chamfered arc surface or a chamfered surface at the connection between two connected planes.

[0009] Furthermore, the cross section of the polyhedral rod is an approximate polygon, and the outer wall of the polyhedral rod includes a plurality of approximate planes connected end to end, and one of the approximate planes constitutes the outer contact approximate plane.

[0010] Furthermore, the polyhedral rod is provided with a chamfered arc surface or a chamfered surface at the connection between two connected approximate planes.

[0011] Further, the cross section of the polyhedral rod is irregularly shaped;

[0012] When there is one outer contact plane or outer contact approximate plane, the outer wall of the polyhedral rod is provided with a connecting arc surface between the two ends of the outer contact plane or the outer contact approximate plane;

[0013] When there are multiple external contact planes or external contact approximate planes, the outer wall of the polyhedral rod is provided with a connecting arc surface between two adjacent external contact planes or between two adjacent external contact approximate planes.

[0014] Furthermore, the polyhedral rod is provided with a chamfered arc surface or a chamfered surface at the connection between the outer contact plane and the connecting arc surface, or at the connection between the outer contact approximate plane and the connecting arc surface.

[0015] The present invention also provides a device for a piston hammer, comprising a piston cylinder body, a guide sleeve, and a piston rod as described above, wherein the piston cylinder body is provided with an inner support hole extending vertically, the guide sleeve is fixed in the inner support hole and is provided with a guide hole extending vertically, the piston main body section is movably assembled in the inner support hole of the piston cylinder body, the piston guide section is movably assembled in the guide hole of the guide sleeve, the piston cylinder body is provided with an inner contact plane or an inner contact approximate plane on the hole wall surface of the inner support hole, and / or the guide sleeve is provided with an inner contact plane or an inner contact approximate plane on the hole wall surface of the guide hole, the inner contact plane or the inner contact approximate plane is adapted to the outer contact plane or the outer contact approximate plane of the piston rod, and the two are in surface contact.

[0016] Furthermore, the guide sleeve is integrally formed on the wall surface of the inner supporting hole of the piston cylinder body.

[0017] Furthermore, the guide sleeve is a component independent of the piston cylinder.

[0018] The present invention further provides a guide sleeve, which is used to cooperate with the piston rod guide as described above, and a guide hole that passes through the guide sleeve from top to bottom is opened in the guide sleeve. The piston guide section of the piston rod is the polyhedral rod and is assembled in the guide hole of the guide sleeve so as to be movably installed up and down. The guide sleeve is provided with an inner contact plane or an inner contact approximate plane on the hole wall of the guide hole, and the inner contact plane or the inner contact approximate plane of the guide sleeve is in surface contact with the outer contact plane or the outer contact approximate plane of the piston rod.

[0019] As described above, the piston rod and the piston hammer according to the present invention have the following beneficial effects:

[0020] At least one section of the piston rod in the present application is a polyhedral rod that matches the piston cylinder body, and an outer contact plane or an outer contact approximate plane is provided on the outer wall of the polyhedral rod, and the outer contact plane or the outer contact approximate plane is arranged on the side to which the piston rod deviates when striking; in this way, under the combined action of the deflected striking force and the up and down movement state of the piston rod, the piston rod is in surface contact with the inner wall of the piston cylinder body and / or the guide sleeve of the piston hammer at its outer contact plane or the outer contact approximate plane, thereby increasing the contact area between the piston rod and the piston cylinder body and / or the guide sleeve at the side to which the piston rod deviates when striking, thereby reducing the pressure per unit area there, making it difficult for the hydraulic oil film there to be squeezed away by the deflected striking force, ensuring the lubrication there, greatly reducing the metal friction there, avoiding the wear of the outer wall of the piston rod and the inner wall of the piston cylinder body and / or the guide sleeve, thereby effectively avoiding the cylinder pulling phenomenon, and ultimately ensuring the long-term normal operation of the hydraulic piston hammer, making the hydraulic piston hammer durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the piston hammer of this application.

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the piston rod.

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of the piston cylinder.

[0024] Figure 4a This is a schematic diagram of the cooperation between the piston rod and the piston cylinder and / or the guide sleeve at the side to which the piston rod deviates when striking in the present application.

[0025] Figure 4b The diagram is a schematic diagram of the cooperation between the piston rod and the piston cylinder and / or the guide sleeve at the side to which the piston rod deviates when striking in the prior art.

[0026] Figure 5a to Figure 5e This figure shows different embodiments of the piston rod in the present application, and is a main view.

[0027] Figure 6a to Figure 6o This figure shows different embodiments of the polyhedral rod in the present application, and is a top view.

[0028] Figure 7 for Figure 2 Top view of the .

[0029] Component number description

[0030] 10 Piston rod

[0031] 101 Piston main section

[0032] 102 Strike Hammer

[0033] 103 Upper guide rod

[0034] 104 Lower guide rod

[0035] 20 Polyhedral Rod

[0036] 21 External contact plane

[0037] 22 External contact approximation plane

[0038] 23 Chamfered arc surface

[0039] 24 Chamfered face

[0040] 25 Connecting arc surface

[0041] 30 Piston Cylinder

[0042] 31 Inner support hole

[0043] 32 External contact plane

[0044] 33 Cylinder upper outlet

[0045] 34 Cylinder lower outlet

[0046] 35 Sealed Area

[0047] 40 Guide sleeve

[0048] 41 Guide hole

[0049] 42 Upper guide sleeve

[0050] 43 Lower guide sleeve DETAILED DESCRIPTION

[0051] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0052] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0053] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0054] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0055] The present application provides a piston rod 10 and a piston hammer equipped with the piston rod 10 , wherein the piston hammer is a hydraulic piston hammer.

[0056] like Figures 1 to 3 As shown, the piston hammer involved in the present application includes a piston rod 10 extending up and down, a piston cylinder 30, and a guide sleeve 40. The piston rod 10 includes a piston main section 101 and a piston guide section fixedly connected, and a striking hammer head 102 arranged at the lower end of the piston rod 10, and the striking hammer head 102 is used to cooperate with the drill rod for striking. An inner support hole 31 that passes through from top to bottom is provided in the piston cylinder 30, the upper end opening of the inner support hole 31 is the cylinder upper outlet 33, and the lower end opening of the inner support hole 31 is the cylinder lower outlet 34. The guide sleeve 40 is fixed in the inner support hole 31, and a guide hole 41 that passes through from top to bottom is provided in the guide sleeve 40. The piston main section 101 can be movably assembled in the inner support hole 31 of the piston cylinder 30, and the cross-sectional shapes of the two are the same, and there is a gap between the piston main section 101 and the hole wall surface of the inner support hole 31; the piston guide section can be movably assembled in the guide hole 41 of the guide sleeve 40, and the cross-sectional shapes of the two are the same.

[0057] In particular, as shown in FIG. 4 , the piston main section 101, or the piston guide section, or the piston main section 101 and the piston guide section of the piston rod 10 is a polyhedral rod 20, and the polyhedral rod 20 has a polyhedral outer wall, that is, the outer wall of the polyhedral rod 20 is provided with an outer contact plane 21 or an outer contact approximate plane 22 at least on one side to which the piston rod 10 deflects when striking. At the same time, Figure 7 As shown, the inner wall surface of the piston cylinder body 30 and / or the guide sleeve 40 matched with the polyhedral rod 20 is adapted to the outer wall of the polyhedral rod 20. The "adaptation" in this application refers to the same shape. The piston cylinder body 30 is provided with an inner contact plane 32 or an inner contact approximate plane on the hole wall surface of the inner support hole 31, and / or the guide sleeve 40 is provided with an inner contact plane 32 or an inner contact approximate plane on the hole wall surface of the guide hole 41. The inner contact plane 32 or the inner contact approximate plane on the piston cylinder body 30 and / or the guide sleeve 40 is adapted to the outer contact plane 21 or the outer contact approximate plane 22 of the piston rod 10. In this application, the inner contact plane 32 and the outer contact plane 21 both refer to planes extending straight, and the inner contact approximate plane and the outer contact approximate plane 22 both refer to arc surfaces with larger outer diameters and closer to planes. In addition, the large arc surface constituting the outer contact approximate plane 22 can be a concave surface or a convex surface.

[0058] For example, when the piston rod 10 is deflected forward during striking, at least the front outer wall of the polyhedral rod 20 is the outer contact plane 21 or the outer contact approximate plane 22, and the front hole wall of the inner support hole 31 and / or the front hole wall of the guide hole 41 that match the polyhedral rod 20 are the inner contact plane 32 or the inner contact approximate plane. In this way, under the combined effect of the deflected striking force and the up-and-down movement state, the piston rod 10 approaches the hole wall of the inner support hole 31 and the hole wall of the guide hole 41 along the direction of the deflected striking force, and this place is exactly the surface contact part of the piston rod 10's outer contact plane 21 or the outer contact approximate plane 22, and the inner contact plane 32 or the inner contact approximate plane of the piston cylinder 30 and / or the guide sleeve 40, that is, during the operation, the piston rod 10 is in surface contact with the inner wall of the piston cylinder 30 and / or the guide sleeve 40 of the piston hammer at least at the outer contact plane 21 or the outer contact approximate plane 22. After such arrangement, at the side of the piston rod 10 that is biased toward the middle cylinder body, Figure 4a The surface contact structure of the present application is shown relative to Figure 4b With respect to the prior art line contact structure shown, the present application effectively increases the contact area between the piston rod 10 and the piston cylinder 30 and / or the guide sleeve 40 at the side to which it is biased when struck, and increases the original contact area there to more than 500%, thereby greatly reducing the pressure per unit area there, making it difficult for the hydraulic oil film there to be squeezed away by the biased striking force, ensuring the lubrication there, greatly reducing the metal friction there, avoiding wear on the outer wall of the piston rod 10 and the inner wall of the piston cylinder 30 and / or the guide sleeve 40, thereby effectively avoiding the cylinder pulling phenomenon, and ultimately ensuring the long-term normal operation of the hydraulic piston hammer, making the hydraulic piston hammer durable.

[0059] Furthermore, the piston guide section includes an upper guide rod 103 and a lower guide rod 104 respectively fixed at the upper and lower ends of the piston main section 101 along the axial direction of the piston rod 10, and the striking hammer head 102 is fixed at the lower end of the lower guide rod 104. Based on this, there are two guide areas in the piston cylinder 30, or in other words, there are two guide sleeves 40, namely, an upper guide sleeve 42 for guiding and cooperating with the upper guide rod 103, and a lower guide sleeve 43 for guiding and cooperating with the lower guide rod 104. Preferably, the guide sleeve 40 is integrally formed on the hole wall surface of the inner support hole 31 of the piston cylinder 30. Alternatively, the guide sleeve 40 is a component independent of the piston cylinder 30, in which case the guide sleeve 40 can be detachably fixedly installed in the piston cylinder 30. Figure 3 In the piston cylinder 30 shown, the upper guide sleeve 42 is a component independent of the piston cylinder 30, and the lower guide sleeve 43 is integrally formed on the hole wall surface of the inner support hole 31 of the piston cylinder 30. In addition, a sealing area 35 is provided at the lower end of the piston cylinder 30 to seal with the lower guide rod 104 of the piston rod 10.

[0060] Based on the fact that the upper guide sleeve 42 is an independent component and when the upper guide sleeve 42 cooperates with the upper guide rod 103 of the polyhedral rod 20, the present application further provides a guide sleeve 40, which cooperates with the polyhedral rod 20 constituting the upper guide rod 103 in the piston rod 10, and a guide hole 41 extending from top to bottom is provided in the guide sleeve 40, and the guide sleeve 40 is provided with an inner contact plane 32 or an inner contact approximate plane on the hole wall of the guide hole 41, and the inner contact plane 32 or the inner contact approximate plane of the guide sleeve 40 is in surface contact with the outer contact plane 21 or the outer contact approximate plane 22 of the piston rod 10. The shape of the outer wall of the upper guide sleeve 42 is adapted to the shape of the inner support hole 31 of the piston cylinder 30 where it is fixed, for example, both can be circular, or both have at least one section of a plane or an approximate plane; and the shape of the inner wall of the upper guide sleeve 42 is adapted to the shape of the upper guide rod 103, and both have at least one section of a plane or an approximate plane.

[0061] Preferably, the piston rod 10 is an integral component, and the upper guide rod 103 and the lower guide rod 104 are both machined by turning, so that the outer diameter of the upper guide rod 103 and the outer diameter of the lower guide rod 104 are smaller than the outer diameter of the piston main body section 101, and the upper guide rod 103 extends upward from the upper end of the piston main body section 101 as a whole, and the lower guide rod 104 extends downward from the lower end of the piston main body section 101 as a whole.

[0062] Further, in the piston rod 10, at least one of the piston main section 101, the upper guide rod 103 and the lower guide rod 104 is a polyhedral rod 20. Based on the different arrangements of the polyhedral rod 20 in the piston rod 10, the piston rod 10 has multiple embodiments, and the piston hammer has multiple embodiments. The following provides multiple embodiments of the piston rod 10 and the piston hammer, and the multiple embodiments of the piston hammer provided below all adopt a structure in which the upper guide sleeve 42 is an independent component and the lower guide sleeve 43 is integrally formed in the piston cylinder 30.

[0063] Embodiment 1 of the piston rod 10 and the piston hammer Figure 5a As shown, the upper guide rod 103 of the piston rod 10 and the piston main body section 101 are both cylindrical rods, and the lower guide rod 104 of the piston rod 10 is a polyhedral rod 20, so the three-section structure of the piston rod 10 from top to bottom is a cylindrical rod, a cylindrical rod and a polyhedral rod 20. In this way, the inner wall surface of the lower guide sleeve 43 is adapted to the outer wall of the polyhedral rod 20, that is, the inner support hole 31 of the piston cylinder 30 is provided with an inner contact plane 32 or an inner contact approximate plane at the lower guide sleeve 43; and the inner support hole 31 of the piston cylinder 30 is a circular hole structure at the upper guide sleeve 42 and the piston main body section 101.

[0064] Embodiment 2 of the piston rod 10 and the piston hammer, as shown in FIG. Figure 5bAs shown, the piston main body section 101 of the piston rod 10 is a cylindrical rod, and the upper guide rod 103 and the lower guide rod 104 of the piston rod 10 are both polyhedral rods 20, so the three sections of the piston rod 10 from top to bottom are the polyhedral rod 20, the cylindrical rod and the polyhedral rod 20. In this way, the inner wall surface of the upper guide sleeve 42 and the inner wall surface of the lower guide sleeve 43 are both adapted to the outer wall of the polyhedral rod 20, that is, the inner wall surface of the upper guide sleeve 42 and the inner support hole 31 of the piston cylinder 30 are provided with an inner contact plane 32 or an inner contact approximate plane at the lower guide sleeve 43; and the inner support hole 31 of the piston cylinder 30 is a round hole structure at the piston main body section 101.

[0065] Embodiment 3 of the piston rod 10 and the piston hammer, as shown in FIG. Figure 5c As shown, the upper guide rod 103, the piston main body section 101 and the lower guide rod 104 of the piston rod 10 are all polyhedral rods 20, and the three sections of the piston rod 10 from top to bottom are all polyhedral rods 20. In this way, the inner wall surface of the upper guide sleeve 42 and the hole wall surface of the inner support hole 31 of the piston cylinder 30 (including the lower guide sleeve 43) are provided with an inner contact plane 32 or an inner contact approximate plane.

[0066] Embodiment 4 of the piston rod 10 and the piston hammer Figure 5d As shown, the upper guide rod 103 of the piston rod 10 is a cylindrical rod, the lower guide rod 104 of the piston rod 10 and the piston main body section 101 are both polyhedral rods 20, and the three sections of the piston rod 10 from top to bottom are cylindrical rods, polyhedral rods 20 and polyhedral rods 20. In this way, the hole wall surface of the inner support hole 31 of the piston cylinder 30 (including the lower guide sleeve 43) is provided with an inner contact plane 32 or an inner contact approximate plane, and the guide hole 41 of the upper guide sleeve 42 is a round hole structure.

[0067] Embodiment 5 of the piston rod 10 and the piston hammer Figure 5e As shown, the lower guide rod 104 of the piston rod 10 is a cylindrical rod, and the upper guide rod 103 and the piston main body section 101 of the piston rod 10 are both polyhedral rods 20, so the three-section structure of the piston rod 10 from top to bottom is the polyhedral rod 20, the polyhedral rod 20 and the cylindrical rod. In this way, the inner wall surface of the upper guide sleeve 42 and the piston cylinder body 30 are both provided with an inner contact plane 32 or an inner contact approximate plane at the piston main body section 101, and the guide hole 41 of the lower guide sleeve 43 is a circular hole structure, that is, the inner support hole 31 of the piston cylinder body 30 is a circular hole structure at the lower guide sleeve 43.

[0068] Furthermore, the polyhedral rod 20 has a polyhedral outer wall, and there are many ways to form the polyhedral outer wall.

[0069] For example, the cross section of the polyhedral rod 20 is a polygon, and the outer wall of the polyhedral rod 20 includes a plurality of planes connected end to end, one of which constitutes an outer contact plane 21. Preferably, the polyhedral rod 20 is provided with a chamfered arc surface 23 or a chamfered surface 24 at the connection of two connected planes. In this way, the polyhedral outer wall of the polyhedral rod 20 is composed of a plurality of planes, or a plurality of planes plus arcs.

[0070] For another example, the cross section of the polyhedral rod 20 is approximately polygonal, and the outer wall of the polyhedral rod 20 includes a plurality of approximate planes connected end to end, one of which constitutes an outer contact approximate plane 22. Preferably, the polyhedral rod 20 is provided with a chamfered arc surface 23 or a chamfered surface 24 at the connection of two connected approximate planes. In this way, the polyhedral outer wall of the polyhedral rod 20 is composed of a plurality of arcs with different curvatures.

[0071] For another example, the cross section of the polyhedron rod 20 is irregular; in this case, when there is one external contact plane 21 or one external contact approximate plane 22, the outer wall of the polyhedron rod 20 is provided with a connecting arc surface 25 between the two ends of the external contact plane 21 or the external contact approximate plane 22; or, when there are multiple external contact planes 21 or multiple external contact approximate planes 22, the outer wall of the polyhedron rod 20 is provided with a connecting arc surface 25 between two adjacent external contact planes 21 or between two adjacent external contact approximate planes 22. Preferably, the polyhedron rod 20 is provided with a chamfered arc surface 23 or a chamfered surface 24 at the connection between the external contact plane 21 and the connecting arc surface 25, or at the connection between the external contact approximate plane 22 and the connecting arc surface 25. In this way, the polyhedron outer wall of the polyhedron rod 20 is composed of at least one plane or at least one approximate plane, and the polyhedron outer wall of the polyhedron rod 20 can be composed of arc surfaces with different curvatures, or can be composed of a plane and arc surfaces with different curvatures.

[0072] Several preferred embodiments of the polyhedral rod 20 are provided below.

[0073] Embodiment 1 of the polyhedral rod 20: Figure 6a As shown, the cross section of the polyhedral rod 20 is triangular, and its polyhedral outer wall includes three planes, one of which constitutes an outer contact plane 21; and the polyhedral rod 20 is rounded at three edges to form a rounded arc surface 23. Therefore, the polyhedral outer wall of the polyhedral rod 20 in the first embodiment is composed of a plane and an arc surface.

[0074] Embodiment 2 of the polyhedral rod 20: Figure 6b As shown, the cross section of the polyhedral rod 20 is square, and its polyhedral outer wall includes four planes, one of which constitutes an outer contact plane 21; and the polyhedral rod 20 has rounded corners at four edges to form rounded arc surfaces 23. Therefore, the polyhedral outer wall of the second embodiment of the polyhedral rod 20 is composed of a plane and an arc surface.

[0075] Embodiment 3 of the polyhedral rod 20: Figure 6c As shown, the cross section of the polyhedron rod 20 is approximately triangular, and its polyhedron outer wall includes three approximate planes with large curvatures, and the approximate planes are convex surfaces protruding outward, one of which constitutes an outer contact approximate plane 22; and the polyhedron rod 20 has rounded corners at three edges to form a rounded arc surface 23 with a smaller curvature. Therefore, the polyhedron outer wall of the polyhedron rod 20 in the third embodiment is composed of arc surfaces with different curvatures.

[0076] Embodiment 4 of the polyhedral rod 20: Figure 6d As shown, the cross section of the polyhedron rod 20 is approximately square, and its polyhedron outer wall includes four approximate planes with large curvatures, and the approximate planes are convex surfaces protruding outward, one of the approximate planes constitutes an outer contact approximate plane 22; and the polyhedron rod 20 has rounded corners at four edges to form a rounded arc surface 23 with a smaller curvature. Therefore, the polyhedron outer wall of the fourth embodiment of the polyhedron rod 20 is composed of arc surfaces with different curvatures.

[0077] Embodiment 5 of the polyhedral rod 20: Figure 6e As shown, the cross section of the polyhedral rod 20 is square, and its polyhedral outer wall includes four planes, one of which constitutes the outer contact plane 21. Therefore, the polyhedral outer wall of the polyhedral rod 20 in the fifth embodiment is composed of planes.

[0078] Embodiment 6 of the polyhedral rod 20: Figure 6f As shown, the cross section of the polyhedral rod 20 is triangular, and its polyhedral outer wall includes three planes, one of which constitutes an outer contact plane 21; and the polyhedral rod 20 is chamfered at three edges to form chamfered surfaces 24. Therefore, the polyhedral outer wall of the polyhedral rod 20 in the sixth embodiment is composed of planes.

[0079] Embodiment 7 of the polyhedral rod 20: Figure 6g As shown, the cross section of the polyhedral rod 20 is square, and its polyhedral outer wall includes four planes, one of which constitutes an outer contact plane 21; and the polyhedral rod 20 is chamfered at four edges to form chamfered surfaces 24. Therefore, the polyhedral outer wall of the polyhedral rod 20 in the seventh embodiment is composed of planes.

[0080] Embodiment 8 of the polyhedral rod 20: Figure 6h As shown, the cross section of the polyhedron rod 20 is a special shape, and its polyhedron outer wall includes a plane and an arc, the plane constitutes the outer contact plane 21, and the arc is the connecting arc surface 25 connected between the two ends of the outer contact plane 21. Therefore, the polyhedron outer wall of the polyhedron rod 20 in the eighth embodiment is composed of a plane and an arc surface.

[0081] Embodiment 9 of the polyhedral rod 20: Figure 6iAs shown, the cross section of the polyhedron rod 20 is a special shape, and its polyhedron outer wall includes a plane and an arc, the plane constitutes the outer contact plane 21, and the arc is the connecting arc surface 25 connected between the two ends of the outer contact plane 21; and the polyhedron rod 20 is provided with a chamfered arc surface 23 at the connection between the outer contact plane 21 and the connecting arc surface 25. Therefore, the polyhedron outer wall of the polyhedron rod 20 in the ninth embodiment is composed of a plane and an arc surface.

[0082] Embodiment 10 of the polyhedral rod 20: Figure 6j As shown, the cross section of the polyhedron rod 20 is irregular, and its polyhedron outer wall includes two symmetrical planes and two symmetrical arcs, one of which constitutes an outer contact plane 21, and the arc is a connecting arc surface 25 connected between the two outer contact planes 21. Therefore, the polyhedron outer wall of the polyhedron rod 20 in the tenth embodiment is composed of a plane and an arc surface.

[0083] Embodiment 11 of the polyhedral rod 20: Figure 6k As shown, the cross section of the polyhedron rod 20 is a special shape, and its polyhedron outer wall includes two symmetrical planes and two symmetrical arcs, one of which constitutes an outer contact plane 21, and the arc is a connecting arc surface 25 connected between the two outer contact planes 21; and the polyhedron rod 20 is provided with a chamfered arc surface 23 at the connection between the outer contact plane 21 and the connecting arc surface 25. Therefore, the polyhedron outer wall of the polyhedron rod 20 in the eleventh embodiment is composed of a plane and an arc surface.

[0084] Embodiment 12 of the polyhedral rod 20: Figure 6l As shown, it is similar to the third embodiment of the polyhedral rod 20, the only difference being that the approximate plane is a concave surface.

[0085] Embodiment 13 of the polyhedral rod 20: Figure 6m As shown, it is similar to the fourth embodiment of the polyhedral rod 20, the only difference being that the approximate plane is a concave surface.

[0086] The fourteenth embodiment of the polyhedral rod 20 is as follows: Figure 6n As shown, the cross section of the polyhedron rod 20 is a special shape, and its polyhedron outer wall includes an approximate plane with a large curvature and an arc, the approximate plane constitutes an outer contact approximate plane 22, and is a concave surface that is concave inward, and the arc is a connecting arc surface 25 connected between the two ends of the outer contact approximate plane 22; and the polyhedron rod 20 is provided with a chamfered arc surface 23 at the connection between the outer contact approximate plane 22 and the connecting arc surface 25. Therefore, the polyhedron outer wall of the polyhedron rod 20 in the fourteenth embodiment is composed of an arc surface.

[0087] Embodiment 15 of the polyhedral rod 20: Figure 6o As shown, it is similar to the fourteenth embodiment of the polyhedral rod 20, the only difference being that the approximate plane is a convex surface that bulges outward.

[0088] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A piston rod for a piston hammer, comprising a piston main body section (101) and a piston guide section fixedly connected to each other, and a striking hammer head (102) arranged at the lower end of the piston rod (10), characterized in that: The piston main body section (101) and / or the piston guide section is a polyhedral rod (20), and an outer contact plane (21) or an outer contact approximate plane (22) is provided on the outer wall of the polyhedral rod (20) at least on the side to which the piston rod (10) deflects when striking, so that the piston rod (10) is in surface contact with the inner wall of the piston cylinder (30) and / or the guide sleeve (40) of the piston hammer at least at the outer contact plane (21) or the outer contact approximate plane (22).

2. The piston rod for a piston hammer according to claim 1, characterized in that: The piston guide section comprises an upper guide rod (103) and a lower guide rod (104) which are respectively fixed at the upper and lower ends of the piston main section (101) along the axial direction of the piston rod (10); the striking hammer head (102) is fixed at the lower end of the lower guide rod (104); and at least one of the piston main section (101), the upper guide rod (103) and the lower guide rod (104) is the polyhedral rod (20).

3. The piston rod for a piston hammer according to claim 1 or 2, characterized in that: The cross section of the polyhedral rod (20) is polygonal, and the outer wall of the polyhedral rod (20) comprises a plurality of planes connected end to end, one of which constitutes the outer contact plane (21).

4. The piston rod for a piston hammer according to claim 3, characterized in that: The polyhedral rod (20) is provided with a rounded arc surface (23) or a chamfered surface (24) at the connection of two connected planes.

5. The piston rod for a piston hammer according to claim 1 or 2, characterized in that: The cross section of the polyhedral rod (20) is approximately polygonal, and the outer wall of the polyhedral rod (20) comprises a plurality of approximate planes connected end to end, one of which constitutes the outer contact approximate plane (22).

6. The piston rod for a piston hammer according to claim 5, characterized in that: The polyhedral rod (20) is provided with a rounded arc surface (23) or a chamfered surface (24) at the connection point of two connected approximate planes.

7. The piston rod for a piston hammer according to claim 1 or 2, characterized in that: The cross section of the polyhedral rod (20) is irregularly shaped; When one of the outer contact planes (21) or the outer contact approximate planes (22) is provided, the outer wall of the polyhedral rod (20) is provided with a connecting arc surface (25) between the two ends of the outer contact plane (21) or the outer contact approximate plane (22); When a plurality of the outer contact planes (21) or the outer contact approximate planes (22) are provided, the outer wall of the polyhedral rod (20) is provided with a connecting arc surface (25) between two adjacent outer contact planes (21) or between two adjacent outer contact approximate planes (22).

8. The piston rod for a piston hammer according to claim 5, characterized in that: The polyhedral rod (20) is provided with a chamfered arc surface (23) or a chamfered surface (24) at the connection between the outer contact plane (21) and the connecting arc surface (25), or at the connection between the outer contact approximate plane (22) and the connecting arc surface (25).

9. A piston hammer, comprising a piston cylinder (30) and a guide sleeve (40), wherein the piston cylinder (30) is provided with an inner support hole (31) extending vertically therethrough, and the guide sleeve (40) is fixed in the inner support hole (31) and is provided with a guide hole (41) extending vertically therethrough, characterized in that: It also includes the piston rod (10) described in any one of claims 1 to 8, the piston main section (101) can be movably assembled in the inner support hole (31) of the piston cylinder (30), and the piston guide section can be movably assembled in the guide hole (41) of the guide sleeve (40) up and down, and the piston cylinder (30) is provided with an inner contact plane (32) or an inner contact approximate plane on the hole wall surface of the inner support hole (31) and / or the guide sleeve (40) is provided with an inner contact plane (32) or an inner contact approximate plane on the hole wall surface of the guide hole (41), and the inner contact plane (32) or the inner contact approximate plane is adapted to the outer contact plane (21) or the outer contact approximate plane (22) of the piston rod (10), and the two are in surface contact.

10. The piston hammer according to claim 9, characterized in that: The guide sleeve (40) is integrally formed on the wall surface of the inner support hole (31) of the piston cylinder body (30).

11. The piston hammer according to claim 9, characterized in that: The guide sleeve (40) is a component independent of the piston cylinder (30).

12. A guide sleeve, characterized in that: The guide sleeve (40) is used for guiding and cooperating with the piston rod (10) described in claim 1, and a guide hole (41) penetrating up and down is opened in the guide sleeve (40). The piston guide section of the piston rod (10) is the polyhedral rod (20) and is assembled in the guide hole (41) of the guide sleeve (40) so as to be movable up and down. The guide sleeve (40) is provided with an inner contact plane (32) or an inner contact approximate plane on the hole wall of the guide hole (41), and the inner contact plane (32) or the inner contact approximate plane of the guide sleeve (40) is in surface contact with the outer contact plane (21) or the outer contact approximate plane (22) of the piston rod (10).

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