Hydraulic rock drill gear box with damping device

Abstract

The application discloses a hydraulic rock drill gear box with a buffering device, which combines a buffering cylinder body and a gear box body in the prior art through optimized design, and a retaining sleeve is arranged in the box body, a buffering support sleeve and a drill rod spline sleeve are arranged in the retaining sleeve, and a buffering oil cavity is arranged between the buffering support sleeve and the retaining sleeve, so that rotating friction between a buffering core sleeve and a support sleeve in the prior art is avoided, the maintenance frequency is effectively reduced, the production cost is saved, and the size of the device is reduced, so that installation and maintenance are facilitated.

Description

Technical Field

[0001] This invention relates to the field of hydraulic rock drill technology, and more particularly to a hydraulic rock drill gearbox with a buffer device. Background Technology

[0002] A hydraulic rock drill is a new type of rock drill used to drill holes in rocks. It mainly consists of an impact mechanism, a rotation mechanism, a drill bit rebound buffer device, and a drill bit. The impact mechanism drives the drill bit to move axially to impact the rock, and the rotation mechanism drives the drill bit to rotate to keep the hole circular.

[0003] Currently, the tappet rebound buffer device is installed between the gearbox of the slewing mechanism and the impact mechanism, as shown in the attached diagram. Figure 1 The buffer cylinder 2 is installed at the front end of the gearbox 1. The buffer core sleeve 3 installed inside the buffer cylinder 2 is provided with a buffer oil chamber 4 between it and the inner wall of the cylinder. The support sleeve 5 installed on the inner ring of the driven gear 6 in the gearbox 1 is pressed against the buffer core sleeve 3. During operation, one end of the drill rod 7 is pressed against the working surface and the other end is pressed against the support sleeve 5. The piston rod of the impact mechanism intermittently impacts the buffer core sleeve 3 to push the drill rod 7 to move axially. At the same time, the driven gear 6 drives the drill rod 7 and the support sleeve 5 to rotate. As a result, the buffer core sleeve 3 and the support sleeve 5 not only undergo axial deformation, but also experience rotational wear on their contact surface. After a period of operation, a gap will form between them, requiring replacement and maintenance. In order to extend the maintenance cycle of the equipment and reduce the frequency of maintenance, a hydraulic rock drill gearbox with a buffer device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic rock drill gearbox with a buffer device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A hydraulic rock drill gearbox with a buffer device includes a housing. One end of the housing has a connecting hole, and the other end is fitted with an end cap. A retaining sleeve is disposed inside the housing. Roller bearings are disposed at both ends of the retaining sleeve. The inner and outer rings of the roller bearings are connected to the inner walls of the retaining sleeve and the housing, respectively. A driven gear is disposed on the retaining sleeve between the two roller bearings. A buffer support sleeve and a drill spline sleeve are disposed inside the retaining sleeve. One end of the buffer support sleeve is adjacent to the connecting hole, and a boss is disposed on one end of the buffer support sleeve. The boss and the inner wall of the retaining sleeve form a buffer oil cavity, which is filled with hydraulic oil. A telescopic cavity is disposed between the buffer support sleeve and the drill spline sleeve. A drill rod is installed inside the drill spline sleeve, and the drill rod engages with the keyway of the drill spline sleeve.

[0007] Furthermore, an oil injection groove is provided on the inner wall of the housing, and the oil injection groove is connected to the hydraulic system provided on the outside of the housing. A sealing element is provided on both sides of the oil injection groove, and the two sides of the sealing element are respectively sealed against the retaining sleeve and the inner wall of the housing. An oil guiding cavity is formed between the two sealing elements. An oil injection hole is provided on the retaining sleeve. The oil injection groove, the oil guiding cavity, the oil injection hole and the buffer oil cavity are connected.

[0008] Furthermore, the inner wall of the retaining sleeve is provided with two sets of sealing rings, which are respectively located on both sides of the buffer oil cavity.

[0009] Furthermore, a drill rod mating surface is provided on the buffer support sleeve at one end of the telescopic cavity, and the drill rod mating surface fits into one end of the drill rod.

[0010] Furthermore, a retaining cap is installed at the end of the drill spline sleeve away from the buffer support sleeve.

[0011] The beneficial effects of this invention are:

[0012] This invention avoids the rotational friction between the buffer core sleeve and the support sleeve in the prior art by setting a retaining sleeve inside the housing, and setting a buffer support sleeve and a drill spline sleeve inside the retaining sleeve, and setting a buffer oil cavity between the buffer support sleeve and the retaining sleeve. This effectively reduces the frequency of maintenance and saves production costs, while also reducing the size of the device and making it easier to install and maintain. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the gearbox structure of a hydraulic rock drill in the prior art.

[0014] Figure 2 This is a schematic diagram of the structure of a hydraulic rock drill gearbox with a buffer device proposed in this invention.

[0015] In the diagram: 1. Housing 1, connecting hole 101, end cap 102, oil filling groove 103, buffer cylinder 2, buffer core sleeve 3, buffer oil chamber 4, support sleeve 5, driven gear 6, chisel 7, buffer support sleeve 8, roller bearing 9, chisel spline sleeve 10, retaining cover 11, buffer support sleeve 12, boss 121, oil filling hole 13, seal 14, oil guide chamber 141, sealing ring 15, telescopic chamber 16. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Example 1

[0018] Reference Figure 2This invention provides a technical solution: a hydraulic rock drill gearbox with a buffer device, comprising a housing 1, a retaining sleeve 8 installed inside the housing 1, a connecting hole 101 at one end of the housing 1, and an end cap 102 installed at the other end, the connecting hole 101 communicating with an impact mechanism, roller bearings 9 installed at both ends of the retaining sleeve 8, the inner and outer rings of the roller bearings 9 respectively connecting to the outer side of the retaining sleeve 8 and the inner wall of the housing 1, a driven gear 6 installed on the retaining sleeve 8 between the two roller bearings 9, during operation, the drive gear of the rotary mechanism meshes with the driven gear 6 to drive the retaining sleeve 8 to rotate, and a buffer support sleeve 12 and a drill rod are installed inside the retaining sleeve 8. Spline sleeve 10, drill rod spline sleeve 10 and drill rod 7 keyway fit. Buffer support sleeve 12 and drill rod spline sleeve 10 are spaced apart and a telescopic cavity 16 is provided between them. One end of the telescopic cavity 16 is provided with a drill rod mating surface 17 that fits with one end of the drill rod 7. During operation, the drill rod 7 is pressed against the drill rod mating surface 17 through the telescopic cavity 16. The piston rod of the impact mechanism strikes the buffer support sleeve 12, pushing the drill rod 7 to move axially. During maintenance, the drill rod 7 is separated from the buffer support sleeve 12 for easy repair and replacement. A retaining cover 11 is installed at the end of the drill rod spline sleeve 10 away from the buffer support sleeve 12, and the retaining cover 11 holds the drill rod 7 on the drill rod spline sleeve 10.

[0019] A boss 121 is provided on the end of the buffer support sleeve 12 adjacent to the spline sleeve 10 of the drill rod. The boss 121 and the inner wall of the retaining sleeve 8 form a buffer oil cavity 4. An oil injection hole 13 is provided on the retaining sleeve 8. An oil injection groove 103 is provided on the inner wall of the housing 1. A sealing element 14 is installed on both sides of the oil injection groove 103. The two sides of the sealing element 14 are respectively sealed against the retaining sleeve 8 and the inner wall of the housing 1. An oil guide cavity 141 is formed between the two sealing elements 14. The oil guide cavity 141 is connected to the oil injection groove 103. The oil injection hole 13 connects the buffer oil cavity 4 and the oil guide cavity 141. The oil injection groove 103 is connected to the hydraulic system provided outside the housing 1, thereby maintaining the pressure in the buffer oil cavity 4. When the equipment is working, the retaining sleeve 8 rotates in the housing 1, and the sealing element 14 and the housing 1 remain relatively stationary. When the drill rod 7 rebounds, the boss 121 compresses the hydraulic oil in the buffer oil cavity 4 to absorb the kinetic energy of the rebound of the drill rod 7.

[0020] Two sets of sealing rings 15 are provided on the inner wall of the retaining sleeve 8. The two sets of sealing rings 15 are respectively provided on both sides of the buffer oil chamber 4 to prevent the hydraulic oil inside from overflowing when the pressure increases.

[0021] The working principle is as follows: one end of the drill rod 7 is pressed against the rock surface, and the other end is pressed against the buffer support sleeve 12 through the telescopic cavity 16. The piston rod of the impact mechanism strikes the buffer support sleeve 12, pushing the drill rod 7 to move axially. At the same time, the rotary mechanism drives the retaining sleeve 8 to rotate through the driven gear 6 to carry out rock drilling. Compared with the prior art, the present invention optimizes the design of the combination of the buffer cylinder and the gearbox, reducing the size of the device and facilitating installation and maintenance. At the same time, the buffer support sleeve 12 and the drill rod 7 no longer generate rotational friction during operation, avoiding wear between the two, effectively reducing the frequency of maintenance and saving production costs.

[0022] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic rock drill gearbox with a buffer device, comprising a housing, one end of which is provided with a communicating hole, and the other end of which is fitted with an end cap, characterized in that: The housing contains a retaining sleeve with roller bearings at both ends. The inner and outer rings of the roller bearings are connected to the retaining sleeve and the inner wall of the housing, respectively. A driven gear is provided on the retaining sleeve between the two roller bearings. The retaining sleeve contains a buffer support sleeve and a drill spline sleeve. One end of the buffer support sleeve is adjacent to the connecting hole and has a boss. The boss and the inner wall of the retaining sleeve form a buffer oil cavity filled with hydraulic oil. A telescopic cavity is provided between the buffer support sleeve and the drill spline sleeve. A drill rod is installed inside the drill spline sleeve and engages with the keyway of the drill spline sleeve. A drill rod mating surface is provided on the buffer support sleeve at one end of the telescopic cavity, and the drill rod mating surface engages with one end of the drill rod.

2. The hydraulic rock drill gearbox with a buffer device according to claim 1, characterized in that: An oil filling groove is provided on the inner wall of the housing. The oil filling groove is connected to a hydraulic system located outside the housing. A sealing element is provided on both sides of the oil filling groove. The two sides of the sealing element are respectively sealed against the retaining sleeve and the inner wall of the housing. An oil guiding cavity is formed between the two sealing elements. An oil filling hole is provided on the retaining sleeve. The oil filling groove, the oil guiding cavity, the oil filling hole and the buffer oil cavity are connected.

3. A hydraulic rock drill gearbox with a buffer device according to claim 1 or 2, characterized in that: The inner wall of the retaining sleeve is provided with two sets of sealing rings, which are respectively located on both sides of the buffer oil cavity.

4. A hydraulic rock drill gearbox with a buffer device according to claim 3, characterized in that: A retaining cap is provided on the end of the drill spline sleeve away from the buffer support sleeve.

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