Drill shank assembly of rock drill and rock drill

Abstract

The utility model discloses a jackdrill shank assembly and a jackdrill. The jackdrill shank assembly solves the technical problem that the sealing performance of a flushing head is affected by the jackdrill shank assembly of the jackdrill. The jackdrill shank assembly comprises a machine head, and a front guide sleeve, a water jacket, a tail guide sleeve and a check ring which are sequentially in axial sliding fit with a shank from front to back are arranged in an inner cavity of the machine head. On the basis that the front guide sleeve and the tail guide sleeve are used, the tail guide sleeve and the water jacket are designed in a separated mode, adverse effects of easily-abraded parts on water jacket sealing components are avoided, the tail guide sleeve is closer to the rear, the distance between the front guide sleeve and the tail guide sleeve is prolonged, and the guide effect is further improved. Meanwhile, according to the technical scheme provided by the utility model, the risk of seal failure of the flushing system of the rock drill is reduced, the service life of the seal in the water jacket is prolonged, the reliability of the rock drill is improved, and the maintenance period of the rock drill is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of rock drill guides, in particular to a rock drill tail assembly and a rock drill. Background Art

[0002] Hydraulic rock drill is a key equipment for tunnel excavation by drill and blast method. It includes propulsion, impact, rotation, flushing, lubrication, buffer and other systems. The impact system includes the machine head, drill tail, stop ring, guide copper sleeve, impact piston and so on. The impact piston impacts the drill tail to realize the rock drilling process. The end of the drill tail stroke hits the stop ring to achieve the effect of stopping the drill tail.

[0003] During the rock drilling process, the impact piston impacts the drill tail. When the rock drill hits empty, the drill tail impacts the stop ring. Since both the drill tail and the stop ring are subject to a large impact force and the material is relatively hard, the stop ring cannot directly contact the drill tail, otherwise it will aggravate the wear of the drill tail and the stop ring. Therefore, the stop ring and the drill tail must be matched with clearance and cannot be guided. At present, the drill tail guide for hydraulic rock drills only has a guide copper sleeve at the front end of the head, which cannot play a good role in guiding the drill tail. When drilling, the drill tail is subjected to high impact force and high frequency impact of the impact piston. When drilling oblique holes, the drill tail is subjected to radial force, resulting in aggravated wear of the front guide copper sleeve, and the drill tail is offset, shortening the maintenance cycle of the rock drill and reducing the rock drilling accuracy. In addition, the offset of the drill tail is likely to cause damage to the water seal in the water jacket, thereby reducing the maintenance cycle of the rock drill and reducing the reliability of the impact system and flushing system. Therefore, it is necessary to design a drill tail guide device.

[0004] After searching, the Chinese utility model patent with authorization announcement number CN 202531012 U discloses a shank guide device for a hydraulic rock drill, and the Chinese utility model patent with authorization announcement number CN 202417298 U discloses a sealing guide device for the shank of a hydraulic rock drill. The technical solutions of the above two utility model patents both disclose a guide sleeve that works together with the head copper sleeve, but they have the same disadvantages: first, the guide sleeve needs to be assembled as a part of the flushing head seal, and the guide sleeve is a wear-prone part. When the guide sleeve is worn, the flushing head seal will fail. Therefore, the setting of the guide sleeve reduces the reliability of the flushing head seal; second, although the guide sleeve is located at the rear of the head copper sleeve, it is still biased to the front relative to the entire head, and the reliability of the guide needs to be improved; third, the guide sleeve and the flushing head seal form an assembly structure, which not only reduces the reliability of the seal, but also has large and complex structural changes, which is not convenient for assembly and maintenance; fourth, there is rigid contact between the flushing head and the stop ring, and between the guide sleeve and the stop ring.

[0005] In summary, in the prior art, the rock drill tail assembly of the rock drill has a complex structure, insufficient guiding performance and affects the sealing performance of the flushing head. Therefore, it is necessary to design a new rock drill tail assembly.

[0006] It should be particularly noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present utility model, and should not be regarded as admitting or implying in any form that the above technical information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0007] In view of the deficiencies in the above-mentioned background technology, the utility model provides a rock drill tail assembly and a rock drill, which solves the technical problem that the rock drill tail assembly of the rock drill affects the sealing performance of the flushing head.

[0008] The technical solution of this application is:

[0009] A rock drill tail assembly comprises a head, wherein the inner cavity of the head is provided with a front guide sleeve, a water jacket, a tail guide sleeve and a stop ring which are sequentially axially slidably matched with the tail from front to rear. Based on the use of the front guide sleeve and the tail guide sleeve, the technical solution separates the tail guide sleeve from the water jacket, which not only avoids the adverse effects of the easily-worn parts on the water jacket sealing components, but also the tail guide sleeve is further rearward, which prolongs the distance between the front guide sleeve and the tail guide sleeve, and further improves the guiding effect.

[0010] As a preferred technical solution, the center hole of the stop ring and the shank shank axially slidingly matched is a stepped hole, the inner diameter of the front section of the stepped hole is larger than the inner diameter of the rear section, the tail end of the tail guide sleeve is in abutment with the step surface of the stepped hole, and the front end is in abutment with the tail of the water jacket. On the basis of the above technical solution, the rock drill tail assembly provided by this technical solution is designed with a stepped assembly structure, the tail guide sleeve can be inserted into the large hole of the front section of the stop ring, and the tail guide sleeve is axially positioned by the stepped surface of the stop ring and the tail end face of the water jacket, so that the axial guide dimension of the tail guide sleeve can be extended within the limited axial space, and the axial space of the water jacket will not be occupied, and the sealing between the water jacket and the shank will not be affected.

[0011] As a preferred technical solution, the tail section outer wall of the tail guide sleeve is interference fit with the front section inner wall of the stepped hole. Based on the above technical solution, the rock drill tail assembly provided by this technical solution is designed with an interference fit structure, which is not only convenient for the processing and assembly of the parts, but also convenient for the maintenance and replacement of the tail guide sleeve.

[0012] As a preferred technical solution, the tail guide sleeve is welded to the stop ring. On the basis of the above technical solution, the rock drill tail assembly provided by this technical solution is designed with a welded assembly structure. Although it reduces the convenience of processing, assembly and maintenance compared to the detachable structure, it enhances the firmness between the tail guide sleeve and the stop ring, and can provide a more stable and reliable guide for the tail guide sleeve within the effective life of the tail guide sleeve. This technical solution adopts a structural method in which the stop ring and the tail guide sleeve are integrated, such as welding by bimetallic sintering, laser cladding and other processes.

[0013] As a preferred technical solution, the outer wall of the tail guide sleeve is interference fit with the inner wall of the machine head. Based on the above technical solution, this technical solution provides another assembly method of the tail guide sleeve, so that the tail guide sleeve is directly assembled on the inner wall of the machine head without the need for indirect positioning of the tail guide sleeve through a stop ring.

[0014] As a preferred technical solution, a buffer pad is provided between the water jacket and the stop ring. On the basis of the above technical solution, the rock drill tail assembly provided by the technical solution is designed with a buffer structure, and the assembly form of the buffer pad varies with the assembly mode of the tail guide sleeve. For example, if the tail guide sleeve is connected between the water jacket and the stop ring, the buffer pad is sleeved on the outside of the tail guide sleeve and is coaxially arranged with the tail guide sleeve; if the outer wall of the tail guide sleeve is directly interference-fitted with the inner wall of the machine head, the buffer pad is arranged between the tail guide sleeve and the stop ring or between the water jacket and the tail guide sleeve.

[0015] As a preferred technical solution, at least one seal is provided between the inner wall of the front guide sleeve and the outer wall of the shank.

[0016] As a preferred technical solution, at least one seal is provided between the front end inner wall of the water jacket and the outer wall of the shank, and between the front end outer wall of the water jacket and the inner wall of the machine head, and at least two seals are provided between the rear end inner wall of the water jacket and the outer wall of the shank, and between the rear end outer wall of the water jacket and the inner wall of the machine head.

[0017] As a preferred technical solution, at least one of the front guide sleeve and the rear guide sleeve is a copper guide sleeve or a copper alloy guide sleeve. Based on the above technical solution, the rock drill tail assembly provided by the technical solution preferably uses the type of guide sleeve. Of course, in addition to the copper guide sleeve and the copper alloy guide sleeve, at least one of the front guide sleeve and the rear guide sleeve can also be made of other guide materials.

[0018] A rock drill comprises the rock drill tail assembly described in any one of the above technical solutions.

[0019] Compared with the prior art, the technical solution provided by the utility model designs a double guide sleeve of the drill tail, which effectively avoids the tilting of the drill tail, makes the impact system more stable, improves the rock drilling accuracy of the rock drill, and improves the working efficiency of the rock drill. At the same time, the technical solution provided by the utility model also reduces the risk of seal failure of the rock drill flushing system, extends the service life of the seal in the water jacket, improves the reliability of the rock drill, and extends the maintenance cycle of the rock drill. In addition, the technical solution provided by the utility model can reduce the wear of the retaining ring, extend the service life of the retaining ring, increase the reliability of the rock drill, and extend the maintenance cycle of the rock drill. At the same time, the technical solution provided by the utility model can reduce the wear of the guide copper sleeve of the rock drill's wearing parts, extend the service life of the front guide sleeve, increase the reliability of the rock drill, and extend the maintenance cycle of the rock drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic cross-sectional structure diagram of an implementation mode of the utility model.

[0022] Description of Figure Numbers:

[0023] 1- shank, 2- machine head, 3- front guide sleeve, 4- special-shaped sealing ring, 5- O-ring, 6- sealing ring, 7- water jacket, 8- tail guide sleeve, 9- stop ring, 10- buffer pad. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the core concept of the utility model and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0026] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "several" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial" and the like indicate positions or positional relationships only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0028] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0029] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0031] A rock drill tail assembly, such as Figure 1As shown, it includes a machine head 2, which is a hollow structure with an inner cavity, and a shank 1 is installed in the inner cavity. Specifically, the inner cavity of the machine head 2 is provided with a front guide sleeve 3, a water jacket 7, a tail guide sleeve 8 and a stop ring 9, which are sequentially axially slidably matched with the shank 1 from front to back. Among them, a sliding sealing structure is provided between the inner wall of the front guide sleeve 3 and the inner wall of the water jacket 7 and the outer wall of the shank 1, and a sealing structure is provided between the outer wall of the front guide sleeve 3 and the outer wall of the water jacket 7 and the inner wall of the machine head 2. At the same time, the inner diameters of the front guide sleeve 3 and the tail guide sleeve 8 match the outer diameter of the shank 1, and the inner diameter of the stop ring 9 matches the outer diameter of the shank 1, or the inner wall of the stop ring 9 and the outer wall of the shank 1 are gap-matched.

[0032] In this embodiment, on the basis of using the front guide sleeve 3 and the rear guide sleeve 8, the rear guide sleeve 8 is designed to be separated from the water jacket 7, which not only avoids the adverse effects of easily-worn parts on the sealing components of the water jacket 7, but also the rear guide sleeve 8 is further back, which lengthens the distance between the front guide sleeve 3 and the rear guide sleeve 8, and further improves the guiding effect.

[0033] As a preferred embodiment, the center hole of the stop ring 9 and the shank end 1 for axial sliding fit is a stepped hole, the inner diameter of the front section of the stepped hole is larger than the inner diameter of the rear section, the tail end of the tail guide sleeve 8 is in abutment with the step surface of the stepped hole, and the front end is in abutment with the tail of the water jacket 7. On the basis of the above embodiments, the rock drill tail assembly provided in this embodiment is designed with a stepped assembly structure, the tail guide sleeve 8 can be inserted into the large hole of the front section of the stop ring 9, and the tail guide sleeve 8 is axially positioned by the stepped surface of the stop ring 9 and the tail end surface of the water jacket 7, so that the axial guide dimension of the tail guide sleeve 8 can be extended within the limited axial space, and the axial space of the water jacket 7 will not be occupied, and the sealing between the water jacket 7 and the shank end 1 will not be affected.

[0034] As a preferred embodiment, the tail section outer wall of the tail guide sleeve 8 is interference fit with the front section inner wall of the stepped hole. Based on the above embodiment, the rock drill tail assembly provided in this embodiment is designed with an interference fit structure, which is not only convenient for the processing and assembly of the components, but also convenient for the maintenance and replacement of the tail guide sleeve 8.

[0035] As a preferred embodiment, the tail guide sleeve 8 is connected to the stop ring 9 by welding. On the basis of the above embodiment, the rock drill tail assembly provided in this embodiment is designed with a welding assembly structure. Although it reduces the convenience of processing, assembly and maintenance compared with the detachable structure, it enhances the firmness between the tail guide sleeve 8 and the stop ring 9, and can provide a more stable and reliable guide for the tail guide sleeve 1 within the effective life of the tail guide sleeve 8. This technical solution adopts a structural method in which the stop ring 9 and the tail guide sleeve 8 are combined into one, such as welding by bimetallic sintering, laser cladding and other processes.

[0036] As a preferred embodiment, the outer wall of the tail guide sleeve 8 is interference fit with the inner wall of the machine head 2. Based on the above embodiment, this embodiment provides another assembly method of the tail guide sleeve 8, so that the tail guide sleeve 8 is directly assembled on the inner wall of the machine head 2, without the need to indirectly position the tail guide sleeve 8 through the stop ring 9.

[0037] As a preferred technical solution, a buffer pad 10 is provided between the water jacket 7 and the stop ring 9. On the basis of the above embodiment, the rock drill tail assembly provided in this embodiment is designed with a buffer structure, and the assembly form of the buffer pad 10 varies with the assembly mode of the tail guide sleeve 8. For example, if the tail guide sleeve 8 is connected between the water jacket 7 and the stop ring 9, the buffer pad 10 is sleeved on the outside of the tail guide sleeve 8 and is coaxially arranged with the tail guide sleeve 8; if the outer wall of the tail guide sleeve 8 is directly interference-fitted with the inner wall of the machine head 2, the buffer pad 10 is arranged between the tail guide sleeve 8 and the stop ring 9 or between the water jacket 7 and the tail guide sleeve 8.

[0038] As a preferred embodiment, at least one seal is provided between the inner wall of the front guide sleeve 3 and the outer wall of the shank tail 1 .

[0039] As a preferred embodiment, at least one seal is provided between the front end inner wall of the water jacket 7 and the outer wall of the shank tail 1, and between the front end outer wall of the water jacket 7 and the inner wall of the machine head 2, and at least two seals are provided between the rear end inner wall of the water jacket 7 and the outer wall of the shank tail 1, and between the rear end outer wall of the water jacket 7 and the inner wall of the machine head.

[0040] As a preferred embodiment, at least one of the front guide sleeve 3 and the rear guide sleeve 8 is a copper guide sleeve or a copper alloy guide sleeve. Based on the above embodiment, the rock drill tail assembly provided in this embodiment preferably uses the type of guide sleeve. Of course, in addition to the copper guide sleeve and the copper alloy guide sleeve, at least one of the front guide sleeve 3 and the rear guide sleeve 8 can also be made of other guide materials.

[0041] A drill tail assembly for a rock drill comprises a machine head, a front guide sleeve, a water jacket, a stop ring, a tail guide sleeve and a drill tail. The invention is characterized in that: the outer diameter of the inner hole at the front of the stop ring is enlarged, the outer diameter of the tail guide sleeve is the same as the inner diameter at the front of the stop ring, the outer diameter of the tail guide sleeve matches the inner diameter at the front of the stop ring, the inner diameter of the tail guide sleeve matches the drill tail, the front end of the outer diameter of the tail guide sleeve contacts the water jacket, and the matching order of the parts inside the machine head assembly is: front guide sleeve, water jacket, tail guide sleeve, stop ring and drill tail.

[0042] Specifically, Figure 1As shown, it includes a drill tail 1, a machine head 2, a front guide sleeve 3, a special-shaped sealing ring 4, an O-ring 5, a sealing ring 6, a water jacket 7, a tail guide sleeve 8, and a stop ring 9. The drill tail 1, the front guide sleeve 3, the water jacket 7, the tail guide sleeve 8, and the stop ring 9 are installed on the inner side of the machine head. The machine head 2 axially limits the stop ring 9 through a large step, and the machine head axially limits the front guide sleeve 2, the water jacket 7, and the tail guide sleeve 8 through two small steps. The outer diameter of the tail guide sleeve 8 matches the inner diameter of the stop ring 9, and the outer diameter of the drill tail 1 matches the inner diameter of the tail guide sleeve 8.

[0043] The special-shaped sealing ring 4 is arranged on the inner wall of the front guide sleeve 3, and the special-shaped sealing ring 4 is slidingly sealed with the outer wall of the drill tail 1; the O-ring 5 is arranged at the front and rear ends of the inner wall of the water jacket 7, wherein at least two O-rings 5 ​​are arranged at the rear end of the inner wall of the water jacket 7, and each O-ring 5 is slidingly sealed with the outer wall of the drill tail 1; the sealing ring 6 is arranged at the front and rear high ends of the outer wall of the water jacket 7, wherein at least two sealing rings 6 are arranged at the rear end of the outer wall of the water jacket 7, and each sealing ring 6 is sealingly matched with the inner wall of the machine head 2.

[0044] According to the utility model, the impact force of the drill tail 1 of the rock drill can act on the stop ring 9 and the thick head 2, so that the water jacket 7 is not subjected to axial impact force, reducing the risk of multiple impacts on the water jacket 7 to damage its structure and the O-ring 5 and sealing ring 6.

[0045] According to the utility model, the front guide sleeve 3 and the rear guide sleeve 8 jointly guide the drill tail 1, so that the guidance of the drill tail 1 is increased when the rock drill is drilling, and the tilting of the drill tail 1 is effectively avoided, so that the impact system is more stable, the drilling accuracy of the rock drill is improved, and the working efficiency of the rock drill is improved.

[0046] This embodiment designs a new double guide device for the drill tail. As mentioned above, the machine head is axially limited by a large step stop ring, the stop ring is limited by a front step to the tail guide sleeve, and the machine head is axially limited by two small steps to the front guide sleeve, water jacket and tail guide sleeve.

[0047] Therefore, this embodiment increases the guidance of the drill tail, effectively avoids the tilting of the drill tail, makes the impact system more stable, improves the rock drilling accuracy of the rock drill, and improves the working efficiency of the rock drill. In addition, the risk of seal failure of the rock drill flushing system is reduced, the service life of the seal in the water jacket is extended, the reliability of the rock drill is improved, and the maintenance cycle of the rock drill is extended. The utility model can reduce the wear of the stop ring, extend the service life of the stop ring, increase the reliability of the rock drill, and extend the maintenance cycle of the rock drill. The device of the utility model can reduce the wear of the guide copper sleeve of the rock drill's wearing parts, extend the service life, increase the reliability of the rock drill, and extend the maintenance cycle of the rock drill.

[0048] A rock drill comprises the rock drill tail assembly described in any one of the above embodiments.

[0049] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0050] The above content shows and describes the basic principle, main features and beneficial effects of the utility model. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rock drill tail assembly, comprising a drill head (2), characterized in that: The inner cavity of the machine head (2) is provided with a front guide sleeve (3), a water jacket (7), a tail guide sleeve (8) and a stop ring (9) which are axially slidably matched with the shank tail (1) in sequence from front to back; the center hole of the stop ring (9) which is axially slidably matched with the shank tail (1) is a stepped hole, the inner diameter of the front section of the stepped hole is larger than the inner diameter of the rear section, the tail end of the tail guide sleeve (8) is in contact with the step surface of the stepped hole, and the front end is in contact with the tail of the water jacket (7); at least one of the front guide sleeve (3) and the tail guide sleeve (8) is a copper guide sleeve or a copper alloy guide sleeve.

2. The rock drill tail assembly according to claim 1, characterized in that: The outer wall of the tail section of the tail guide sleeve (8) is interference fit with the inner wall of the front section of the stepped hole.

3. The rock drill tail assembly according to claim 1, characterized in that: The tail guide sleeve (8) is welded to the stop ring (9).

4. The rock drill tail assembly according to claim 1, characterized in that: The outer wall of the tail guide sleeve (8) is interference fit with the inner wall of the machine head (2).

5. The rock drill tail assembly according to any one of claims 1 to 4, characterized in that: A buffer pad (10) is provided between the water jacket (7) and the stop ring (9).

6. The rock drill tail assembly according to claim 5, characterized in that: At least one seal is provided between the inner wall of the front guide sleeve (3) and the outer wall of the shank tail (1).

7. The rock drill tail assembly according to any one of claims 1 to 4 and 6, characterized in that: At least one seal is provided between the front inner wall of the water jacket (7) and the outer wall of the drill tail (1), and between the front outer wall of the water jacket (7) and the inner wall of the machine head (2); at least two seals are provided between the rear inner wall of the water jacket (7) and the outer wall of the drill tail (1), and between the rear outer wall of the water jacket (7) and the inner wall of the machine head.

8. A rock drill, characterized in that: The invention comprises the rock drill tail assembly according to any one of claims 1 to 7.

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