Front guiding device and hydraulic power head

Abstract

The utility model discloses a front guide device and a hydraulic power head in the technical field of rock drilling devices, the front guide device comprises a water injection sleeve, a guide cover and a mounting seat, the distance between the mounting seat in the front guide device and a shoulder on a bit shank is minimum, and a buffer structure is arranged on one side, facing the shoulder, of the mounting seat. In other words, when the bit shank axially excessively displaces in the working process, the shoulder on the bit shank firstly makes contact with the buffering structure, the buffering structure can buffer the impact force of the shoulder, damage to the front guiding device caused by excessive displacement of the bit shank is reduced, safe operation of the front guiding device is guaranteed, and the service life of the front guiding device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to rock drilling device technical field, concretely is a front guide device and hydraulic power head. BACKGROUND

[0002] In tunnel construction, it is necessary to carry out pipe shed construction, geological prediction, anchor rod, grouting reinforcement, geological improvement and other construction, which cannot be separated from the use of the actuator on the rock drilling operation equipment - power head;

[0003] Because the power head needs to face various complex working conditions, and the drilling diameter and drilling distance requirements are different according to different needs. In order to make the power head meet the needs of various working conditions and enhance its adaptability, the power head is often designed as a product with large torque and high impact work, which puts high requirements on the strength and performance of the output parts of the power head - the drill bit;

[0004] When the power head works, the drill bit bears large torque load and high-frequency impact, and a large amount of heat will be generated. If the drill bit cannot be cooled in time, the weak part of the drill bit, the thread, will be broken, causing equipment failure and work site operation stoppage;

[0005] For example, the utility model with the authorized announcement number CN221256650U discloses a quick-change water injection sleeve of a rock drill, a drill bit water hole is formed in the drill bit and communicates with the inner annular water injection groove, this structure can cool the drill bit thread and improve the service life of the drill bit. However, this structure opens the drill bit water hole in the equipment, so that the drill bit of the rock drill directly impacts the water sleeve when impacting forward and encountering a cavity in front, which sharply increases the probability of water sleeve damage.

[0006] Based on this, the utility model designs a front guide device and a hydraulic power head to solve the above problems. UTILITY MODEL CONTENTS

[0007] To achieve the above purpose, the utility model provides the following technical scheme: a front guide device, the front guide device is sleeved on the drill bit of a rock drill, and comprises a water injection sleeve, a guide cover and a mounting seat, the water injection sleeve, the mounting seat and the guide cover are all sleeved on the drill bit; among the water injection sleeve, the guide cover and the mounting seat, the mounting seat is closest to the shoulder on the drill bit in the axial direction of the drill bit, and one side of the mounting seat facing the shoulder is provided with a buffer structure for buffering the impact of the shoulder on the front guide device.

[0008] As a further scheme of the utility model, a containing cavity is formed between the mounting seat and the drill bit, the buffer structure is arranged in the containing cavity, and the containing cavity communicates with the side of the mounting seat facing the shoulder on the drill bit, so that the shoulder can enter the containing cavity.

[0009] As a further scheme of the utility model, the buffer structure includes an elastic member and a buffer piston, the buffer piston is arranged in the accommodating cavity in an axial sliding mode along the shank, a mounting surface perpendicular to the axial direction of the shank is formed in the accommodating cavity, one end of the elastic member abuts against the mounting surface, and the other end abuts against the buffer piston, and the diameter of the end of the buffer piston in contact with the elastic member is greater than the diameter of the end away from the elastic member.

[0010] As a further scheme of the utility model, the inner diameter of the buffer piston matches the diameter of the shank, so that the buffer piston and the shank are gap matched.

[0011] As a further scheme of the utility model, the water injection sleeve, the guide cover and the mounting seat are sequentially arranged along the axial direction of the shank.

[0012] As a further scheme of the utility model, a first oil passage is formed in the mounting seat, the first oil passage is communicated with the outer surface of the mounting seat and the accommodating cavity, and is used for conveying lubricating medium into the accommodating cavity.

[0013] As a further scheme of the utility model, a second oil passage is formed in the guide cover, the second oil passage is communicated with the inner cavity of the guide cover, and an oil seal is arranged on the side of the inner cavity of the guide cover away from the mounting seat.

[0014] As a further scheme of the utility model, an annular water injection groove is formed in the inner wall of the water injection sleeve, and a water injection hole is formed in the water injection groove and communicated with the outer wall of the water injection sleeve.

[0015] The utility model discloses a hydraulic power head, containing preceding guide device, still include gear box and impact device, the shank is arranged in the gear box at the end away from the water injection sleeve, the gear box is used for driving the rotation of shank, the impact device is used for impacting the end of the shank arranged in the gear box.

[0016] As a further scheme of the utility model, the guide cover and the mounting seat are fixedly connected, a connecting piece is fixedly arranged on the side of the mounting seat away from the guide cover, the mounting seat is fixedly connected with the output shaft in the gear box through the connecting piece, so that the mounting seat and the guide cover keep synchronous rotation with the shank.

[0017] The utility model has the following beneficial effects:

[0018] The preceding guide device disclosed by the utility model comprises a water injection sleeve, a guide cover and a mounting seat, the mounting seat is closest to the shoulder on the shank in the preceding guide device, and the side of the mounting seat facing the shoulder is provided with a buffer structure, that is, when the shank has excessive axial displacement in the working process, the shoulder on the shank will first contact the buffer structure, the buffer structure can buffer the impact force of the shoulder, reduces the damage of the preceding guide device caused by excessive displacement of the shank, ensures the safe operation of the preceding guide device and prolongs the service life of the preceding guide device.

[0019] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are presented by way of example or for purpose of explanation only. In the drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of the front guide device.

[0022] Figure 2 It is a schematic diagram of the front guide device.

[0023] Figure 3 It is a schematic diagram of the hydraulic power head structure.

[0024] LEGEND

[0025] 1, water injection sleeve; 11, water injection groove; 12, water injection hole; 2, guide cover; 21, oil seal; 22, bushing; 3, mounting seat; 31, containing cavity; 32, elastic member; 33, buffer piston; 4, drill shank; 41, spline; 5, gear box; 6, impact device; 7, connecting piece. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below with reference to the drawings, but the present application can be implemented in various different ways as defined and covered below.

[0027] Please refer to Figures 1-2 The present application provides a technical solution: a front guide device, the front guide device is sleeved on the drill shank 4 of the rock drill, and the drill shank 4 can rotate and axially move in the front guide device relative to the front guide device.

[0028] The front guide device comprises a water injection sleeve 1, a guide cover 2 and a mounting seat 3, the water injection sleeve 1, the mounting seat 3 and the guide cover 2 are all sleeved on the drill shank 4.

[0029] The guide cover 2 is sleeved on the drill shank 4 for supporting the drill shank 4, ensuring stable operation of the drill shank 4.

[0030] The drill shank 4 is internally provided with a cavity for cooling water to flow through, the water injection sleeve 1 is sleeved on the drill shank 4, and the cooling water can enter the drill shank 4 through the water injection sleeve 1 to cool the drill shank 4 during operation.

[0031] Among the water jacket 1, the guide cover 2 and the mounting seat 3, the mounting seat 3 is closest to the shoulder on the drill bit in the axial direction of the drill bit, and the side of the mounting seat 3 facing the shoulder is provided with a buffer structure for buffering the impact of the shoulder on the front guide device;

[0032] In work, the drill bit 4 rotates and axially displaces in the front guide device, and the axial displacement of the drill bit 4 impacts the position to be drilled; if a cavity appears in front of the drill bit 4 in work, the drill bit 4 may have excessive axial displacement, and at this time, the shoulder on the drill bit 4 may collide with the front guide device, so the mounting seat 3 is arranged in the front guide device, the mounting seat 3 is arranged on the side close to the shoulder, and the side of the mounting seat 3 close to the shoulder is provided with a buffer structure, so that the buffer structure can buffer the impact of the shoulder when the drill bit 4 has excessive axial displacement, and prevent the shoulder from directly colliding with the front guide cover 2 or the water jacket 1, so as to avoid damage to the guide cover 2 or the water jacket 1, improve the service life of the front guide device, and ensure the safe operation of the rock drill.

[0033] The front guide device disclosed by the utility model comprises a water jacket 1, a guide cover 2 and a mounting seat 3, the distance between the mounting seat 3 and the shoulder on the drill bit 4 in the front guide device is the smallest, and the side of the mounting seat 3 facing the shoulder is provided with a buffer structure, that is, when the drill bit 4 has excessive axial displacement in the working process, the shoulder on the drill bit 4 will first contact the buffer structure, the buffer structure can buffer the impact force of the shoulder, reduce the damage to the front guide device caused by the excessive displacement of the drill bit 4, ensure the safe operation of the front guide device, and improve the service life of the front guide device;

[0034] Specifically, the mounting seat 3 and the drill bit 4 form a containing cavity 31, and the buffer structure is arranged in the containing cavity 31, so that the buffer structure is isolated from the external environment, a good working environment is ensured for the buffer structure, the service life of the buffer structure is improved, and the mounting space of the buffer structure and the mounting seat 3 in the axial direction of the drill bit 4 is compressed, so that the structure is more compact;

[0035] The containing cavity 31 is communicated with the side of the mounting seat 3 facing the shoulder on the drill bit 4, so that the shoulder can enter the containing cavity 31, and after the buffer structure is arranged in the containing cavity 31, in order to enable the buffer structure to normally contact the shoulder, the containing cavity 31 needs to be communicated with the side of the mounting seat 3 facing the shoulder, and the opening diameter of the containing cavity 31 on the side of the mounting seat 3 facing the shoulder needs to be greater than the diameter of the shoulder, so that the shoulder can enter the containing cavity 31 and contact the buffer structure, so that the buffer structure can normally buffer the impact of the shoulder on the drill bit 4;

[0036] Specifically, as shown in the drawings, Figure 2As shown, the buffer structure includes an elastic element 32 and a buffer piston 33. The buffer piston 33 is slidably disposed in the receiving cavity 31 along the axial direction of the drill bit 4. The receiving cavity 31 has a mounting surface perpendicular to the axial direction of the drill bit 4. One end of the elastic element 32 abuts against the mounting surface, and the other end abuts against the buffer piston 33. When the shoulder impacts the buffer structure, it will first contact the buffer piston 33 in the buffer structure, and then push the buffer piston 33 to squeeze the elastic element 32. The deformation of the elastic element 32 absorbs the impact force of the shoulder impact on the water injection sleeve 1 and the guide cover 2. At the same time, when the drill bit 4 stops moving, the rebound force of the elastic element 32 causes the drill bit 4 to move backward, preparing for the next impact.

[0037] The diameter of the end of the buffer piston 33 that contacts the elastic element 32 is larger than the diameter of the end that is away from the elastic element 32. This increases the contact area between the buffer piston 33 and the elastic element 32 when the buffer piston 33 impacts the elastic element 32, increases the force-bearing area of ​​the elastic element 32 when it receives the impact, and makes the force on the elastic element 32 more uniform when it receives the impact, so as to ensure the safe use of the elastic element 32 and extend the service life of the elastic element 32.

[0038] Specifically, the elastic element 32 can be made of springs, elastic pads or other structures that can buffer the force. Preferably, in this example, the elastic element 32 is a disc spring. The disc spring can provide high load-bearing capacity while maintaining the compactness of the structure, which is more suitable for the narrow receiving cavity 31 in the mounting base 3.

[0039] Furthermore, the inner diameter of the buffer piston 33 matches the diameter of the drill bit 4 so that the buffer piston 33 and the drill bit 4 are in clearance fit. Through the clearance fit between the buffer piston 33 and the drill bit 4, external impurities are prevented from entering the receiving cavity 31, so as to ensure the normal use of the elastic element 32 and the buffer piston 33.

[0040] like Figure 2 As shown, the water injection sleeve 1, guide cover 2, and mounting base 3 are arranged sequentially along the axial direction of the drill bit 4. Since the mounting base 3 is closest to the shoulder on the drill bit 4, the water injection sleeve 1 is furthest from the shoulder on the drill bit 4. In other words, the connection between the water injection sleeve 1, the drill bit 4, and the punch is the closest. The water injection sleeve 1 is a consumable part. When it needs to be replaced, only the water injection sleeve 1 needs to be removed. There is no need to disassemble the front guide device and the drill bit 4, which greatly improves the replacement speed and work efficiency.

[0041] Furthermore, a first oil passage is provided on the mounting base 3, which connects the outer surface of the mounting base 3 and the receiving cavity 31, and is used to deliver lubricating medium into the receiving cavity 31.

[0042] During operation, grease and other lubricating media are delivered to the receiving cavity 31 through the first oil passage to lubricate the elastic element 32 and the buffer piston 33, thereby reducing the wear of the elastic element 32 and the buffer piston 33 and extending their service life.

[0043] Specifically, a bushing 22 is provided in the inner cavity of the guide cover 2. The bushing 22 enables the guide cover 2 and the drill bit 4 to move together. At the same time, a second oil passage is provided on the guide cover 2. The second oil passage connects to the inner cavity of the guide cover 2. The second oil passage delivers lubricating media such as grease to the inner cavity of the guide cover 2, reducing the wear of the bushing 22 and extending the service life of the bushing 22.

[0044] Furthermore, an oil seal 21 is provided on the side of the inner cavity of the guide cover 2 away from the mounting base 3. The oil seal 21 prevents the lubricating medium in the inner cavity of the guide cover 2 from leaking out and also prevents external impurities from entering the inner cavity of the guide cover 2, so as to ensure the normal use of the bushing 22.

[0045] like Figure 2 As shown, an annular water injection groove 11 is provided on the inner wall of the water injection sleeve 1. A water injection hole 12 is provided in the water injection groove 11 to connect with the outer wall of the water injection sleeve 1. Cooling water entering the shank 4 from the outside first enters the annular water injection groove 11 through the water injection hole 12, and then enters the inner cavity of the shank 4 through the water injection groove 11. The annular water injection groove 11 can always maintain communication with the inner cavity of the shank 4 during the rotation of the shank 4. At the same time, the water injection groove 11 has a certain distance in the axial direction of the shank 4, so that it can always maintain communication with the inner cavity of the shank 4 when the shank 4 moves axially, so as to ensure that the cooling water can be continuously delivered to the shank 4 during the operation of the shank 4.

[0046] like Figure 3 As shown, this utility model also provides a hydraulic power head, including a front guide device, a gearbox 5, and an impact device 6. The end of the drill bit 4 furthest from the water injection sleeve 1 is located inside the gearbox 5. The gearbox 5 drives the drill bit 4 to rotate, and the impact device 6 impacts the end of the drill bit 4 located inside the gearbox 5. Figure 1 As shown, a spline 41 is provided at the end of the drill bit 4 away from the water injection sleeve 1, and an output shaft is provided inward of the gear 5. The drill bit 4 is inserted into the output shaft through the spline 41 on its surface. The rotation of the output shaft drives the drill bit 4 to rotate. At the same time, the impact device 6 impacts the drill bit 4 from the end of the drill bit 4 located inward of the gear, so that the drill bit 4 impacts the position to be chiseled while rotating.

[0047] Furthermore, the guide cover 2 is fixedly connected to the mounting base 3, and a connector 7 is fixedly provided on the side of the mounting base 3 away from the guide cover 2. The mounting base 3 is fixedly connected to the output shaft in the gearbox 5 through the connector 7, so that the mounting base 3 and the guide cover 2 and the drill bit 4 rotate synchronously, thereby reducing the wear of the bushing 22 and the oil seal 21 and greatly improving the service life of the bushing 22 and the oil seal 21.

[0048] Specifically, the connecting piece 7 can adopt a mounting flange.

[0049] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0050] It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

Claims

1. A front guide device, said front guide device being sleeved on the shank (4) of a rock drill, characterized in that: It includes a water injection sleeve (1), a guide cover (2) and a mounting base (3), wherein the water injection sleeve (1), the mounting base (3) and the guide cover (2) are all sleeved on the drill bit (4); Among the water injection sleeve (1), guide cover (2) and mounting base (3), the mounting base (3) is closest to the shoulder on the shank (4) in the axial direction of the shank, and the side of the mounting base (3) facing the shoulder is provided with a buffer structure to buffer the impact of the shoulder on the front guide device.

2. The forward guide device according to claim 1, characterized in that: A receiving cavity (31) is formed between the mounting base (3) and the drill bit (4). The buffer structure is disposed in the receiving cavity (31). The receiving cavity (31) is connected to the side of the mounting base (3) facing the upper shoulder of the drill bit (4) so ​​that the shoulder can enter the receiving cavity (31).

3. A forward guide device according to claim 2, characterized in that: The buffer structure includes an elastic element (32) and a buffer piston (33). The buffer piston (33) is slidably disposed in the receiving cavity (31) along the axial direction of the drill bit (4). The receiving cavity (31) has a mounting surface perpendicular to the axial direction of the drill bit (4). One end of the elastic element (32) abuts against the mounting surface, and the other end abuts against the buffer piston (33). The diameter of the end of the buffer piston (33) that contacts the elastic element (32) is greater than the diameter of the end that is away from the elastic element (32).

4. A forward guide device according to claim 3, characterized in that: The inner diameter of the buffer piston (33) matches the diameter of the drill bit (4) so ​​that the buffer piston (33) and the drill bit (4) are in clearance fit.

5. A forward guide device according to claim 1, characterized in that: The water injection sleeve (1), guide cover (2) and mounting base (3) are arranged sequentially along the axial direction of the drill bit (4).

6. A forward guide device according to claim 2, characterized in that: The mounting base (3) is provided with a first oil passage, which connects the outer surface of the mounting base (3) and the receiving cavity (31) for conveying lubricating medium into the receiving cavity (31).

7. A forward guide device according to claim 1, characterized in that: The guide cover (2) is provided with a second oil passage, which is connected to the inner cavity of the guide cover (2), and an oil seal (21) is provided on the side of the inner cavity of the guide cover (2) away from the mounting base (3).

8. A forward guide device according to claim 1, characterized in that: The inner wall of the water injection sleeve (1) is provided with an annular water injection groove (11), and the water injection groove (11) is provided with a water injection hole (12) that connects to the outer wall of the water injection sleeve (1).

9. A hydraulic power head, comprising the front guide device as described in any one of claims 1-8, characterized in that: It also includes a gearbox (5) and an impact device (6). The end of the drill bit (4) away from the water injection sleeve (1) is located in the gearbox (5). The gearbox (5) is used to drive the drill bit (4) to rotate. The impact device (6) is used to impact the end of the drill bit (4) located in the gearbox (5).

10. A hydraulic power head according to claim 9, characterized in that: The guide cover (2) is fixedly connected to the mounting base (3), and a connector (7) is fixedly provided on the side of the mounting base (3) away from the guide cover (2). The mounting base (3) is fixedly connected to the output shaft in the gearbox (5) through the connector (7) so that the mounting base (3) and the guide cover (2) and the drill bit (4) rotate synchronously.

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