Rock drill

Abstract

The invention relates to the field of rock drilling equipment, in particular to a rock drill which comprises a shell, a motor, a transmission assembly and a bit shank sleeve, the motor is connected to the surface of the shell, the transmission assembly comprises a cylinder sleeve and a bit shank spline sleeve, the cylinder sleeve coaxially sleeves the peripheral face of a rotating shaft of the motor, and a plurality of first flat keys are connected to the peripheral face of the motor at intervals; a plurality of first key grooves are formed in the inner ring wall of the cylinder sleeve at intervals, a plurality of positioning blocks are connected to the end face, away from the motor, of the cylinder sleeve at intervals, a plurality of positioning grooves are formed in the end face of the bit shank spline sleeve at intervals, one end of the bit shank sleeve is coaxially embedded into the inner cavity wall, away from the cylinder sleeve, of the bit shank spline sleeve, and a plurality of second flat keys are connected to the peripheral face of the bit shank sleeve at intervals. A plurality of second key grooves are formed in the inner ring wall of the bit shank spline sleeve at intervals. Through the arrangement of the cylinder sleeve and the bit shank spline sleeve, rotation of the drill bit is achieved, a gear mechanism does not need to be installed to drive the drill bit to rotate, the transmission efficiency of the transmission assembly to the drill bit is improved, and therefore the working efficiency of the rock drill is improved, and the service life of the rock drill is prolonged.

Description

Technical Field

[0001] The present application relates to the field of rock drilling equipment, and in particular to a rock drilling machine. Background Art

[0002] A rock drill is a tool used for mining stone. It can drill holes in rock strata so that explosives can be placed to blast the rock, thereby completing stone mining or other stone engineering. The rock drill includes a base body, a motor, a gear mechanism, a hydraulic system and a drill tail. The motor is connected to the base body, and the gear mechanism is connected between the motor and the drill tail. The motor drives the drill tail to rotate through the gear mechanism. The end of the drill tail protruding from the base body is used for the installation of a drill bit or a drill rod. At the same time, the hydraulic system is connected to the base body. The hydraulic system can drive the drill bit or the drill rod on the drill tail to impact the rock, thereby achieving the chiseling and crushing of the rock.

[0003] However, during long-term and high-load operation, the gear mechanism will be worn and damaged due to mutual wear and collision, which will reduce the transmission efficiency of the gear mechanism and thus reduce the working efficiency of the rock drill. Summary of the invention

[0004] In order to improve the working efficiency of the rock drill, the present application provides a rock drill.

[0005] The present application provides a rock drill, which adopts the following technical solution: A rock drill comprises a housing, a motor, a transmission assembly and a drill tail sleeve, wherein the motor is connected to the housing surface, the motor rotating shaft passes through the housing outer wall and is located in the housing inner cavity, the transmission assembly comprises a cylinder sleeve and a drill tail spline sleeve, the cylinder sleeve is coaxially sleeved on the outer peripheral surface of the motor rotating shaft, the outer peripheral surface of the motor rotating shaft is connected with a plurality of flat keys at intervals, the inner ring wall of the cylinder sleeve is provided with a plurality of key slots for the flat keys to be embedded, the end surface of the cylinder sleeve away from the motor is connected with a plurality of positioning blocks at intervals, and the The end surface of the shank spline sleeve is provided with a plurality of positioning grooves for the positioning blocks to be embedded. When the positioning blocks are embedded in the positioning grooves one by one, the axis of the cylinder sleeve and the axis of the shank spline sleeve coincide. One end of the shank sleeve is coaxially embedded in the inner cavity wall of the shank spline sleeve away from the cylinder sleeve, and the other end of the shank sleeve protrudes from the shell surface for the drill bit to be installed. The outer circumferential surface of the shank sleeve located in the inner cavity of the shank spline sleeve is connected with a plurality of flat keys 2 at intervals, and the inner ring wall of the shank spline sleeve is provided with a plurality of key slots 2 for the flat keys 2 to be embedded.

[0006] By adopting the above technical scheme, the motor is connected to the surface of the shell to form a fixation, the motor rotating shaft passes through the outer wall of the shell and is located in the inner cavity of the shell, the cylinder sleeve is embedded in the inner cavity of the shell, and the cylinder sleeve is coaxially sleeved on the outer peripheral surface of the motor rotating shaft, and multiple flat keys are embedded in the keyway one by one, and the outer wall of the flat key abuts against the inner wall of the keyway to form a limit; at the same time, the drill tail spline sleeve is embedded in the inner cavity of the shell, and multiple positioning blocks are embedded in the positioning groove one by one, and the outer wall of the positioning block abuts against the inner wall of the positioning groove to form a limit, thereby realizing the coaxial connection between the drill tail spline sleeve and the cylinder sleeve, and one end of the drill tail sleeve is coaxially embedded in the drill tail The tail spline sleeve is away from the inner cavity wall of the cylinder sleeve, and multiple flat keys are embedded in the keyway two in a one-to-one correspondence. The outer wall of the flat key two abuts against the inner wall of the keyway two to form a limit, and the other end of the drill tail sleeve protrudes out of the shell surface and is provided for the drill bit to be installed. When the rock drill is working, the motor drives the drill tail spline sleeve to rotate through the cylinder sleeve, and the drill tail spline sleeve drives the drill tail sleeve to rotate. The drill bit is installed on the drill tail sleeve to realize the rotation of the drill bit. There is no need to install a gear mechanism to drive the drill bit to rotate, thereby improving the transmission efficiency of the transmission component to the drill bit, thereby improving the working efficiency of the rock drill and extending the service life of the rock drill.

[0007] Optionally, it also includes an impact assembly, which also includes an impact piston and a shank thrust sleeve, the impact piston is coaxially slidably connected to the inner wall of the cylinder sleeve, the impact piston can impact the end face of the shank sleeve and drive the shank sleeve to slide on the inner wall of the shank spline sleeve, the cylinder sleeve is coaxially provided with a limiting cavity for accommodating the shank thrust sleeve towards the end face of the shank spline sleeve, the end of the shank thrust sleeve protruding from the cylinder sleeve is coaxially embedded in the inner ring wall of the shank spline sleeve, the outer ring wall of the shank thrust sleeve is pressed against the inner ring wall of the shank spline sleeve to form a limit, the inner cavity of the shank thrust sleeve is provided for the sliding of the impact piston, and the shank thrust sleeve is provided for the end face of the shank sleeve to impact the end face of the shank sleeve.

[0008] By adopting the above technical scheme, one end of the drill tail thrust sleeve is embedded in the limiting cavity, and the other end of the drill tail thrust sleeve is coaxially embedded in the inner ring wall of the drill tail spline sleeve. The drill tail spline sleeve and the cylinder sleeve are pressed against the two ends of the drill tail thrust sleeve in the axial direction to form a limit, so that the drill tail thrust sleeve is not easy to be displaced in the inner cavity of the shell, thereby improving the limiting stability of the drill tail thrust sleeve in the shell; at the same time, when the impact piston penetrates the inner cavity of the drill tail thrust sleeve along the inner wall of the cylinder sleeve and is embedded in the inner cavity of the drill tail spline sleeve to impact the end face of the drill tail sleeve, the drill tail sleeve is subjected to the impact force of the impact piston. The drill bit slides along the inner wall of the drill tail spline sleeve toward the direction away from the drill tail thrust sleeve, and the drill tail sleeve drives the drill bit to impact the rock surface, so that the drill bit impacts the rock surface while rotating, thereby improving the rock crushing efficiency; at the same time, the drill bit is impacted by the rock and slides along the inner wall of the drill tail spline sleeve toward the cylinder sleeve through the drill tail sleeve, and the end face of the drill tail sleeve impacts the end face of the drill tail thrust sleeve, and the drill tail thrust sleeve provides support for the drill tail sleeve, so that the drill tail sleeve is not easy to enter the inner cavity of the cylinder sleeve, thereby ensuring the stability of the drill tail sleeve sliding on the inner wall of the drill tail spline sleeve.

[0009] Optionally, a buffer surface is provided on the end surface of the shank thrust sleeve facing the shank sleeve, and the buffer surface is expanded in a direction close to the axis of the shank thrust sleeve, and the buffer surface is provided for impact of the end surface of the shank sleeve.

[0010] By adopting the above technical solution, the buffer surface is expanded toward the direction close to the axis of the drill bit thrust sleeve. When the end face of the drill bit sleeve impacts the buffer surface, the impact force of the drill bit sleeve is decomposed into two components, one is a component downward along the buffer surface, which drives the drill bit sleeve to slide downward along the buffer surface, and the other is a component perpendicular to the buffer surface, which drives the end face of the drill bit sleeve to be close to the buffer surface, thereby realizing the decomposition of the impact force of the drill bit sleeve on the drill bit thrust sleeve, reducing the impact force of the drill bit sleeve on the drill bit thrust sleeve, making the buffer surface less likely to be compressed and worn, thereby extending the service life of the drill bit thrust sleeve.

[0011] Optionally, the outer circumferential surface of the impact piston is pressed against the inner wall of the cylinder liner to form a seal, and the outer circumferential surface of the cylinder liner is spaced apart with an oil inlet flow channel 1 and an oil inlet flow channel 2, and the oil inlet flow channel 1 and the oil inlet flow channel 2 are both connected to the inner cavity of the cylinder liner, the inner wall of the cylinder liner is provided with a push cavity 1 facing the inner wall of the oil inlet flow channel 1, and the inner wall of the cylinder liner is provided with a push cavity 2 facing the inner wall of the oil inlet flow channel 2, the outer circumferential surface of the impact piston facing the push cavity 1 is provided with a push ring groove 1, and the outer circumferential surface of the impact piston facing the push cavity 2 is provided with a push ring groove 1 A push ring groove 2 is provided. When the push chamber 1 is connected to the push ring groove 1, oil enters the push ring groove 1 through the oil inlet channel 1 and the push chamber 1, and the oil impacts the inner wall of the push ring groove 1, driving the impact piston to slide in the direction close to the push chamber 2. The push chamber 2 is connected to the push ring groove 2, and the oil enters the push ring groove 2 through the oil inlet channel 2 and the push chamber 2, and the oil impacts the inner wall of the push ring groove 2, driving the impact piston to slide in the direction close to the push chamber 1.

[0012] By adopting the above technical scheme, the outer peripheral surface of the impact piston is pressed against the inner wall of the cylinder liner to form a seal. When the rock drill is running, the push chamber one is connected to the push groove one, and the oil enters the push ring groove one through the oil inlet channel one and the push chamber one. The oil impacts the inner wall of the push ring groove one, driving the impact piston to slide along the inner wall of the cylinder liner toward the push chamber two. The push chamber two is connected to the push ring groove two, and the oil enters the push ring groove two through the oil inlet channel two and the push chamber two. The oil impacts the inner wall of the push ring groove two, driving the impact piston to slide along the inner wall of the cylinder liner toward the push chamber one, thereby realizing the back and forth sliding of the impact piston on the inner wall of the cylinder liner.

[0013] Optionally, a push surface 1 is provided on the inner wall of the push ring groove 1 close to the push ring groove 2, and the inclined height of the push surface 1 increases as the distance to the push ring groove 2 decreases. The oil in the push ring groove 1 can impact the push surface 1 and drive the impact piston to approach the push ring groove 2.

[0014] By adopting the above technical solution, the inclined height of the push surface one increases as the distance to the push ring groove two decreases. When the oil enters the push ring groove one through the oil inlet channel one and the push chamber one, the push surface one provides a force application surface for the oil. The oil impacts the push surface one and drives the impact piston to slide along the inner wall of the cylinder liner toward the direction close to the push ring groove two, thereby improving the stability of the impact piston sliding back and forth on the inner wall of the cylinder liner.

[0015] Optionally, a push surface 2 is provided on the inner wall of the push ring groove 2 close to the push ring groove 1, and the inclined height of the push surface 2 increases as the distance to the push ring groove 1 decreases. The oil in the push ring groove 2 can impact the push surface 2 and drive the impact piston to approach the push ring groove 1.

[0016] By adopting the above technical solution, the inclined height of the push surface 2 increases as the distance to the push ring groove 1 decreases. When the oil passes through the oil inlet channel 2 and the push cavity 2 and enters the push ring groove 2, the push surface 2 provides a force application surface for the oil. The oil impacts the push surface 2 and drives the impact piston to slide along the inner wall of the cylinder liner toward the direction close to the push ring groove 1, thereby improving the stability of the impact piston sliding back and forth on the inner wall of the cylinder liner.

[0017] Optionally, the second oil inlet channel is provided with multiple ones, and the multiple oil inlet channel twos are all connected to the limiting cavity, and the limiting cavity divides the second oil inlet channel into two oil inlet sections. The outer peripheral surface of the drill tail thrust sleeve is provided with multiple guide cavities at intervals, and the guide cavities correspond to the second oil inlet channel one by one and the guide cavities connect the two oil inlet sections. The oil passes through one of the oil inlet sections, the guide cavity, the other oil inlet section and enters the second push cavity in sequence.

[0018] By adopting the above technical scheme, multiple oil inlet channels are provided, and the oil is in full contact with the inner wall of the oil inlet channel and performs heat exchange, thereby achieving cooling of the inner wall of the oil inlet channel, making it difficult for the cylinder liner to heat up during long-term operation, thereby ensuring the stability of the rock drill operation; at the same time, the guide cavity separates the second oil inlet channel into two oil inlet sections, and the guide cavity corresponds to the second oil inlet channel one to one and the guide cavity connects the two oil inlet sections, and the oil passes through one of the oil inlet sections, the guide cavity, the other oil inlet section and enters the push cavity in turn, increasing the flow path of the oil, making the inner wall of the guide cavity in full contact with the oil and perform heat exchange, thereby ensuring that the drill tail thrust sleeve is not easily heated up due to the impact of the drill tail sleeve for a long time, and further ensuring the stability of the rock drill operation.

[0019] Optionally, the cylinder sleeve includes a power part, an oil inlet part 1, a sealing part and an oil inlet part 2, the flat key 1 is connected to the inner wall of the power part, one end of the oil inlet part 1 is coaxially fixed to the end face of the power part away from the motor, and the other end of the oil inlet part 1 is coaxially fixed to the end face of the sealing part, an oil storage gap 1 for storing oil supply liquid is reserved between the outer peripheral surface of the oil inlet part 1 and the inner cavity wall of the shell, the opening of the oil inlet flow channel 1 is located on the oil inlet part 1 and is connected to the oil storage gap 1, the outer peripheral surface of the sealing part is pressed against the inner cavity wall of the shell to form a seal, and the sealing part is far away The end face away from the oil inlet part one is coaxially fixed to the end face of the oil inlet part two, the positioning block is connected to the end face of the oil inlet part two away from the sealing part, an oil storage gap two for storing oil supply liquid is reserved between the outer peripheral surface of the oil inlet part two and the inner cavity wall of the shell, the opening of the oil inlet flow channel two is located on the oil inlet part two and connected to the oil storage gap two, the impact assembly includes an oil inlet nozzle one and an oil inlet nozzle two, the oil inlet nozzle one and the oil inlet nozzle two are connected to the shell surface at an interval, the inner cavity of the oil inlet nozzle one is connected to the oil storage gap one, and the inner cavity of the oil inlet nozzle two is connected to the oil storage gap two.

[0020] By adopting the above technical scheme, the oil inlet part 1 and the oil inlet part 2 are located at the two ends of the axial direction of the sealing part, isolating the oil in the oil storage gap 1 and the oil storage gap 2, and the oil enters the oil inlet channel 1 through the oil inlet nozzle 1 and the oil storage gap 1, and the oil enters the oil inlet channel 2 through the oil inlet nozzle 2 and the oil storage gap 2, thereby realizing precise control of the oil pressure in the cylinder liner, thereby ensuring the stability of the impact piston sliding back and forth on the inner wall of the cylinder liner.

[0021] Optionally, the positioning cavity corresponds to and is connected to the guide cavity one by one, and an oil inlet cavity is provided on the end surface of the positioning block facing the positioning cavity, and the oil inlet cavity is connected to the second oil storage gap and the positioning cavity.

[0022] By adopting the above technical scheme, the oil in the second oil storage gap can pass through the oil inlet chamber, the positioning chamber, the guide chamber in sequence and enter the inner chamber of the oil inlet section, thereby increasing the flow path of the oil. The oil is in full contact with the inner wall of the positioning chamber and performs heat exchange, thereby achieving cooling of the drill tail spline sleeve, making it difficult for the drill tail spline sleeve to heat up during operation, thereby improving the stability of the rock drill operation.

[0023] Optionally, a locating bearing is provided on the coaxial sleeve at the end of the cylinder sleeve close to the spline sleeve of the shank, and the outer ring of the locating bearing abuts against the inner cavity wall of the shell.

[0024] By adopting the above technical solution, the inner ring wall of the positioning bearing is coaxially connected to the end of the cylinder sleeve close to the shank spline sleeve, the outer ring of the positioning bearing abuts the inner wall of the shell, and the end of the cylinder sleeve away from the shank spline sleeve is connected to the motor rotating shaft, thereby supporting both ends of the cylinder sleeve in the axial direction, making it difficult for the cylinder sleeve to deflect when rotating in the inner cavity of the shell, thereby improving the stability of the cylinder sleeve rotating on the inner wall of the shell.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of the cylinder sleeve and the drill tail spline sleeve realizes the rotation of the drill bit, and there is no need to install a gear mechanism to drive the drill bit to rotate, thereby improving the transmission efficiency of the transmission component to the drill bit, thereby improving the working efficiency of the rock drill and extending the service life of the rock drill; 2. The setting of the impact piston and the drill bit thrust sleeve. The drill bit thrust sleeve provides support for the drill bit sleeve, so that the drill bit sleeve is not easy to enter the inner cavity of the cylinder sleeve, thereby ensuring the stability of the drill bit sleeve sliding on the inner cavity wall of the drill bit spline sleeve...; 3. The setting of the buffer surface can decompose the impact force of the drill tail sleeve on the drill tail thrust sleeve, reduce the impact force of the drill tail sleeve on the drill tail thrust sleeve, make the buffer surface less likely to be compressed and worn, thereby extending the service life of the drill tail thrust sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view in an embodiment of the present application, mainly showing oil inlet nozzle 1 and oil inlet nozzle 2.

[0028] Figure 3 It is a partial cross-sectional view of the cylinder liner in the embodiment of the present application, mainly showing the second liquid inlet channel.

[0029] Figure 4 It is a partial exploded view in the embodiment of the present application, mainly showing the buffer surface.

[0030] Figure 5 It is a partial exploded view in the embodiment of the present application, mainly showing flat key 1 and flat key 2.

[0031] Figure 6 It is a cross-sectional view in an embodiment of the present application, mainly showing the guide cavity.

[0032] Figure 7 It is a partial cross-sectional view of the piston and the cylinder liner in the embodiment of the present application, mainly showing the push surface one and the push surface two.

[0033] Description of reference numerals: 1, housing; 2, motor; 3, shank sleeve; 4, transmission assembly; 41, shank spline sleeve; 411, positioning groove; 412, keyway 2; 42, cylinder sleeve; 421, power unit; 4211, keyway 1; 422, oil inlet unit 1; 4221, oil storage gap 1; 4222, oil inlet channel 1; 4223, push chamber 1; 423, sealing unit; 424, oil inlet unit 2; 4241, limit chamber; 4242, oil storage gap 2; 4243, oil inlet channel 2; 4244, push chamber 2; 4245, oil inlet section; 5, impact assembly; 51, impact piston; 511, push ring groove 1; 512, push surface 1; 513, push ring groove 2; 514, push surface 2; 52, drill tail thrust sleeve; 521, buffer surface; 522, guide chamber; 53, oil inlet nozzle 1; 54, oil inlet nozzle 2; 6, flat key 1; 7, locating bearing; 8, locating block; 81, oil inlet chamber; 9, flat key 2. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-7 This application is described in further detail.

[0035] The present application embodiment discloses a rock drill. Figure 1 and Figure 2 A rock drill includes a housing 1, a motor 2, a transmission assembly 4, a drill tail sleeve 3 and an impact assembly 5. The bottom of the housing 1 can be fixed to the ground by bolts, the motor 2 is fixed to the surface of the housing 1 by bolts, the axis of the motor 2 rotating shaft and the length direction of the housing 1 are parallel to each other, the end of the motor 2 rotating shaft passes through the outer wall of the housing 1 and is located in the inner cavity of the housing 1, the opening of the housing 1 is located at the end of the housing 1 away from the motor 2, the transmission assembly 4 is connected between the motor 2 rotating shaft and the drill tail sleeve 3, the transmission assembly 4 can receive the power of the motor 2 and drive the drill tail sleeve 3 rotates, and the end of the drill tail sleeve 3 away from the transmission assembly 4 is penetrated by the housing 1 opening for the drill bit or drill rod to be installed, the impact assembly 5 is connected between the housing 1 and the transmission assembly 4, the impact assembly 5 can impact the end surface of the drill tail sleeve 3 and drive the drill bit or drill rod on the drill tail sleeve 3 to impact the rock, so that the drill bit or drill rod can impact the rock surface while rotating, and the rock can be broken, and there is no need to install a gear mechanism to drive the drill bit to rotate, thereby improving the transmission efficiency of the transmission assembly 4 to the drill bit, thereby improving the working efficiency of the rock drill and extending the service life of the rock drill.

[0036] Reference Figure 2 and Figure 3The transmission assembly 4 includes a cylinder sleeve 42 and a shank spline sleeve 41. The cylinder sleeve 42 includes a power part 421, an oil inlet part 1 422, a sealing part 423 and an oil inlet part 2 424. One end of the power part 421 in the axial direction is coaxially fixed to one end of the oil inlet part 1 422 in the axial direction. The end face of the oil inlet part 1 422 in the axial direction away from the power part 421 is coaxially fixed to one end of the sealing part 423 in the axial direction. The end face of the sealing part 423 in the axial direction away from the oil inlet part 1 422 is coaxially fixed to one end of the oil inlet part 2 424 in the axial direction. The outer diameter of the power part 421 is equal to the outer diameter of the sealing part 423. The outer diameter of the sealing part 423 is equal to the inner diameter of the shell 1, and the axial outer wall of the sealing part 423 is pressed against the inner cavity wall of the shell 1 to form a seal.

[0037] Reference Figure 2 and Figure 3 The outer diameter of the oil inlet part 422 is equal to the outer diameter of the oil inlet part 424, and the outer diameter of the oil inlet part 422 is smaller than the inner cavity of the shell 1, the cylinder sleeve 42 is coaxially embedded in the inner cavity of the shell 1, and the end of the power part 421 away from the oil inlet part 422 is coaxially sleeved on the outer peripheral surface of the rotating shaft of the motor 2, and the inner cavity wall of the power part 421 is pressed against the outer peripheral surface of the rotating shaft of the motor 2 to form a limit, and a plurality of flat keys 6 are fixed at intervals on the outer peripheral surface of the rotating shaft of the motor 2, and a keyway 42 is provided at intervals on the inner cavity wall of the power part 421 for the flat key 6 to be embedded. 11, the outer wall of the flat key 6 is pressed against the inner wall of the key groove 4211, and the motor 2 can drive the cylinder sleeve 42 to rotate around its own axis when it is running. The outer peripheral surface of the oil inlet part 424 is coaxially sleeved with a locating bearing 7. In the embodiment of the present application, the locating bearing 7 is a roller bearing, and the outer ring wall of the locating bearing 7 is pressed against the inner wall of the shell 1 to support the two ends of the cylinder sleeve 42 in the axial direction, so that the cylinder sleeve 42 is not easy to deflect when the inner wall of the shell 1 rotates, thereby improving the stability of the cylinder sleeve 42 rotating on the inner wall of the shell 1.

[0038] Reference Figure 2 and Figure 4 The shank spline sleeve 41 is coaxially embedded in the inner cavity of the shell 1, and the shank spline sleeve 41 is located on the side of the oil inlet part 424 away from the sealing part 423. A plurality of positioning blocks 8 are fixed at intervals on the end surface of the oil inlet part 424 facing the shank spline sleeve 41. A plurality of positioning grooves 411 for the positioning blocks 8 to be embedded are provided at intervals on the end surface of the shank spline sleeve 41 facing the oil inlet part 424. The outer wall of the positioning block 8 is pressed against the inner wall of the positioning groove 411 to form a limit, so that the motor 2 can achieve the purpose of driving the shank spline sleeve 41 to rotate through the cylinder sleeve 42.

[0039] Reference Figure 5 and Figure 6The inner cavity of the drill tail sleeve 3 is for installing the drill bit or drill rod. The end of the drill tail sleeve 3 away from the drill bit or drill rod is coaxially embedded in the inner cavity of the drill tail spline sleeve 41 through the inner cavity of the shell 1. The outer circumferential surface of the drill tail sleeve 3 is pressed against the inner cavity wall of the drill tail spline sleeve 41 to form a limit. The outer circumferential surface of the drill tail sleeve 3 located in the inner cavity of the drill tail spline sleeve 41 is fixed with multiple flat keys 9 at intervals. The inner ring wall of the drill tail spline sleeve 41 is spaced apart with multiple key grooves 412 for the flat keys 9 to be embedded. The outer wall of the flat key 29 is pressed against the inner wall of the key groove 412 to form a limit, so that the motor 2 can drive the drill tail sleeve 3 to rotate through the cylinder sleeve 42 and the drill tail spline sleeve 41. There is no need to install a gear mechanism to drive the drill bit to rotate, thereby improving the transmission efficiency of the transmission component 4 to the drill bit, thereby improving the working efficiency of the rock drill and extending the service life of the rock drill.

[0040] Reference Figure 2 The impact assembly 5 includes an impact piston 51, a drill tail thrust sleeve 52, an oil inlet nozzle 1 53 and an oil inlet nozzle 2 54. The material of the impact piston 51 can be rubber or silicone. In the embodiment of the present application, the material of the impact piston 51 is rubber, which has a certain deformation ability. The impact piston 51 is coaxially slidably connected to the inner wall of the cylinder sleeve 42. The outer peripheral surface of the impact piston 51 is pressed against the inner wall of the cylinder sleeve 42 to form a seal. The impact piston 51 can slide along the inner wall of the cylinder sleeve 42 toward the direction close to the drill tail spline sleeve 41 and impact the end face of the drill tail sleeve 3, thereby driving the drill bit or drill rod on the drill tail sleeve 3 to impact the rock surface.

[0041] Reference Figure 4 and Figure 6 The oil inlet portion 424 is coaxially provided with a limiting cavity 4241 for accommodating the end of the shank thrust sleeve 52 toward the end face of the shank spline sleeve 41, and the outer peripheral surface of the shank thrust sleeve 52 abuts against the inner wall of the limiting cavity 4241 to form a limit, and the inner cavity of the shank thrust sleeve 52 is provided for the impact piston 51 to pass through, and the end of the shank thrust sleeve 52 protruding from the oil inlet section 42452 is coaxially embedded in the inner cavity wall of the shank spline sleeve 41, and the outer peripheral surface of the shank thrust sleeve 52 abuts against the inner cavity wall of the shank spline sleeve 41 to form a fixation, the shank spline sleeve 41 and the oil inlet section 42452 are located at both ends of the shank thrust sleeve 52 in the axial direction, so that the shank thrust sleeve 52 is not easy to deviate in the inner cavity of the shell 1, thereby improving the limiting stability of the shank thrust sleeve 52 in the inner cavity of the shell 1.

[0042] Reference Figure 4 and Figure 6The end surface of the drill tail thrust sleeve 52 facing the drill tail sleeve 3 is provided with a buffer surface 521, and the buffer surface 521 is expanded in the direction close to the axis of the drill tail thrust sleeve 52. When the drill bit or drill rod on the drill tail sleeve 3 is impacted by the rock, the drill tail sleeve 3 is driven to rebound along the inner wall of the drill tail spline sleeve 41 toward the direction close to the drill tail thrust sleeve 52, and the end surface of the drill tail sleeve 3 impacts the buffer surface 521. The impact force of the drill tail sleeve 3 is decomposed into two components, one is a component downward along the buffer surface 521, which drives the drill tail sleeve 3 to impact the buffer surface 521, and the other is a component perpendicular to the buffer surface 521, which drives the end surface of the drill tail sleeve 3 close to the buffer surface 521, so as to realize the decomposition of the impact force of the drill tail sleeve 3 on the drill tail thrust sleeve 52, reduce the impact force received by the drill tail thrust sleeve 52, make the drill tail thrust sleeve 52 not easy to be compressed and worn, thereby extending the service life of the drill tail thrust sleeve 52.

[0043] Reference Figure 2 and Figure 7 An oil storage gap 4221 for storing oil supply liquid is reserved between the outer peripheral surface of the oil inlet part 422 and the inner cavity wall of the shell 1, an oil storage gap 4242 for storing oil supply liquid is reserved between the outer peripheral surface of the oil inlet part 424 and the inner cavity wall of the shell 1, an oil inlet nozzle 1 53 and an oil inlet nozzle 2 54 are connected to the surface of the shell 1 at intervals, the inner cavity of the oil inlet nozzle 1 53 is connected to the oil storage gap 4221, and the oil enters the oil storage gap 4221 through the oil inlet nozzle 1 53, the inner cavity of the oil inlet nozzle 2 54 is connected to the oil storage gap 4242, and the oil enters the oil storage gap 4242 through the oil inlet nozzle 2 54, thereby realizing the directional replenishment of the oil in the oil storage gap 4221 and the oil storage gap 4242.

[0044] Reference Figure 2 and Figure 7 A plurality of oil inlet channels 4222 are spaced apart on the outer peripheral surface of the oil inlet section 4245 toward the oil storage gap 4221, and the plurality of oil inlet channels 4222 are evenly spaced around the axis of the oil inlet section 4245, and the inclined height of the oil inlet channel 4222 increases as the distance to the axis of the oil inlet section 4245 decreases, and the end of the oil inlet channel 4222 away from the oil storage gap 4221 is connected to the inner cavity of the cylinder liner 42, thereby increasing the flow path of the oil in the oil inlet channel 4222, so that the oil is fully in contact with the cylinder liner 42 and heat exchange is performed, thereby achieving cooling of the cylinder liner 42 and preventing the cylinder liner 42 from heating up during operation.

[0045] Reference Figure 2 and Figure 7A pushing chamber 4223 is coaxially formed on the inner wall of the inner cavity of the cylinder sleeve 42 toward the inner wall of the oil inlet channel 4222, and a pushing ring groove 511 is coaxially formed on the outer peripheral surface of the impact piston 51 toward the pushing chamber 4223. A pushing surface 512 is provided on the inner wall of the pushing ring groove 511 close to the motor 2, and the inclination height of the pushing surface 512 increases as the distance to the motor 2 decreases. When the pushing chamber 4223 is connected to the pushing ring groove 511, the oil passes through the oil nozzle 1, the oil storage gap 4221, the oil inlet channel 4222 and the pushing chamber 4223 in sequence and enters the pushing ring groove 511, pushing the oil in the ring groove 511 to squeeze the pushing surface 512, driving the impact piston 51 to slide along the inner wall of the cylinder sleeve 42 toward the motor 2, thereby realizing the directional sliding of the impact piston 51 on the inner cavity wall of the cylinder sleeve 42.

[0046] Reference Figure 6 and Figure 7 The outer peripheral surface of the oil inlet section 42452 facing the oil storage gap 4242 is provided with a plurality of oil inlet flow channels 4243 at intervals, and the plurality of oil inlet flow channels 4243 are evenly spaced around the axis of the oil inlet section 42452, and the oil inlet flow channel 1 4222 and the oil inlet flow channel 2 4243 are alternately spaced in sequence, and the oil inlet flow channel 2 4243 penetrates the inner wall of the oil inlet section 42451 in a direction close to the oil inlet section 42451 and is connected to the inner cavity of the cylinder sleeve 42, and a push chamber 4244 is provided on the inner wall of the inner cavity of the cylinder sleeve 42 facing the inner wall of the oil inlet flow channel 4243, and a push ring groove 2 513 is coaxially provided on the outer peripheral surface of the impact piston 51 facing the push chamber 4244, and the push ring groove 2 513 is close to the push ring groove 1 511 The inner wall of the cylinder sleeve 42 is provided with a pushing surface 514, and the inclined height of the pushing surface 514 increases as the distance to the pushing ring groove 1 511 decreases. When the pushing chamber 4244 is connected to the pushing ring groove 1 513, the oil passes through the oil nozzle 2, the oil storage gap 4242, the oil inlet channel 4243 and the pushing chamber 4244 in sequence and enters the pushing ring groove 1 513, pushing the oil in the ring groove 1 513 to squeeze the pushing surface 514, driving the impact piston 51 to slide along the inner wall of the cylinder sleeve 42 toward the direction close to the shank spline sleeve 41, and the end face of the impact piston 51 impacts the surface of the shank sleeve 3, and drives the drill bit or drill rod on the shank sleeve 3 to impact the rock surface, so that the shank sleeve 3 slides back and forth on the inner wall of the shank spline sleeve 41.

[0047] Reference Figure 6 and Figure 7, multiple oil inlet channels 4243 are all connected to the limiting cavity 4241, the limiting cavity 4241 separates the oil inlet channel 4243 to form two oil inlet sections 4245, and multiple guide cavities 522 are spaced apart on the outer peripheral surface of the shank thrust sleeve 52, the guide cavities 522 pass through both ends of the shank thrust sleeve 52 in the axial direction, the guide cavities 522 correspond to the oil inlet channel 4243 one by one and connect the two oil inlet sections 4245, the oil in the oil storage gap 4242 can pass through one of the oil inlet sections 4245, the guide cavity 522, the other oil inlet section 4245 and enter the push cavity in sequence, extending the flow path of the oil in the oil inlet channel 4243, the oil is fully in contact with the inner wall of the guide cavity 522 and heat exchange is performed, so as to realize the cooling of the shank thrust sleeve 52.

[0048] Reference Figure 6 and Figure 7 The positioning cavity and the guide cavity 522 correspond to each other one by one and are connected. An oil inlet cavity 81 is opened on the end face of the positioning block 8 facing the positioning cavity. The oil inlet cavity 81 penetrates the outer wall of the positioning block 8, and the oil inlet cavity 81 is connected to the oil storage gap 2 4242 and the positioning cavity. The oil in the oil storage gap 2 4242 can pass through the oil inlet cavity 81 and the positioning cavity in turn and enter the guide cavity 522, thereby increasing the contact area between the oil and the shank spline sleeve 41, making the inner wall of the positioning cavity fully contact with the oil and perform heat exchange, thereby achieving cooling of the shank spline sleeve 41, improving the cooling efficiency of the rock drill, and making it less likely to heat up and wear during the operation of the rock drill, thereby extending the service life of the rock drill.

[0049] The implementation principle of a rock drill in an embodiment of the present application is as follows: the outer wall of the flat key 6 is pressed against the inner wall of the key groove 4211 to be fixed, the outer wall of the positioning block 8 is pressed against the inner wall of the positioning groove 411 to be fixed, the outer wall of the flat key 2 9 is pressed against the inner wall of the key groove 4211 to be fixed, and the end of the drill tail sleeve 3 protruding from the shell 1 is provided for the installation of the drill bit or the drill rod. When the rock drill is running, the motor 2 drives the drill tail sleeve 3 to rotate through the cylinder sleeve 42 and the drill tail spline sleeve 41, and there is no need to install a gear mechanism to drive the drill bit to rotate, thereby improving the transmission efficiency of the transmission component 4 to the drill bit, thereby improving the working efficiency of the rock drill and extending the service life of the rock drill.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rock drill, characterized in that: The invention comprises a housing (1), a motor (2), a transmission assembly (4) and a shank sleeve (3), wherein the motor (2) is connected to the surface of the housing (1), the rotating shaft of the motor (2) passes through the outer wall of the housing (1) and is located in the inner cavity of the housing (1), the transmission assembly (4) comprises a cylinder sleeve (42) and a shank spline sleeve (41), the cylinder sleeve (42) is coaxially sleeved on the outer peripheral surface of the rotating shaft of the motor (2), the outer peripheral surface of the rotating shaft of the motor (2) is connected with a plurality of flat keys (6) at intervals, the inner ring wall of the cylinder sleeve (42) is provided with a plurality of key slots (4211) for the flat keys (6) to be embedded, the end surface of the cylinder sleeve (42) away from the motor (2) is connected with a plurality of positioning blocks (8) at intervals, and the The end surface of the shank spline sleeve (41) is provided with a plurality of positioning grooves (411) for positioning blocks (8) to be embedded in at intervals. When the positioning blocks (8) are embedded in the positioning grooves (411) one by one, the axis of the cylinder sleeve (42) and the axis of the shank spline sleeve (41) coincide. One end of the shank sleeve (3) is coaxially embedded in the inner cavity wall of the shank spline sleeve (41) away from the cylinder sleeve (42). The other end of the shank sleeve (3) protrudes from the surface of the shell (1) for the drill bit to be installed. The outer peripheral surface of the shank sleeve (3) located in the inner cavity of the shank spline sleeve (41) is connected with a plurality of flat keys (9) at intervals. The inner ring wall of the shank spline sleeve (41) is provided with a plurality of key slots (412) for the flat keys (9) to be embedded in at intervals.

2. A rock drill according to claim 1, characterized in that: The invention also comprises an impact assembly (5), wherein the impact assembly (5) further comprises an impact piston (51) and a shank end thrust sleeve (52), wherein the impact piston (51) is coaxially slidably connected to the inner wall of the cylinder sleeve (42), wherein the impact piston (51) can impact the end face of the shank end sleeve (3) and drive the shank end sleeve (3) to slide on the inner wall of the shank end spline sleeve (41), and the cylinder sleeve (42) is coaxially provided with an end face facing the shank end spline sleeve (41) for accommodating the shank end thrust sleeve (52). The limit cavity (4241) of the push sleeve (52), the end of the shank thrust sleeve (52) protruding from the cylinder sleeve (42) is coaxially embedded in the inner wall of the shank spline sleeve (41), the outer wall of the shank thrust sleeve (52) is pressed against the inner wall of the shank spline sleeve (41) to form a limit, the inner cavity of the shank thrust sleeve (52) is provided for the impact piston (51) to slide, and the shank thrust sleeve (52) faces the end face of the shank sleeve (3) for impacting the end face of the shank sleeve (3).

3. A rock drill according to claim 2, characterized in that: The end surface of the drill tail thrust sleeve (52) facing the drill tail sleeve (3) is provided with a buffer surface (521), and the buffer surface (521) is expanded in a direction close to the axis of the drill tail thrust sleeve (52), and the buffer surface (521) is used for impact of the end surface of the drill tail sleeve (3).

4. A rock drill according to claim 2, characterized in that: The outer peripheral surface of the impact piston (51) is pressed against the inner wall of the cylinder sleeve (42) to form a seal. The outer peripheral surface of the cylinder sleeve (42) is provided with an oil inlet channel 1 (4222) and an oil inlet channel 2 (4243) at intervals. The oil inlet channel 1 (4222) and the oil inlet channel 2 (4243) are both connected to the inner cavity of the cylinder sleeve (42). The inner wall of the inner cavity of the cylinder sleeve (42) is provided with a push chamber 1 (4223) facing the inner wall of the oil inlet channel 1 (4222). The inner wall of the inner cavity of the cylinder sleeve (42) is provided with a push chamber 2 (4244) facing the inner wall of the oil inlet channel 2 (4243). The outer peripheral surface of the impact piston (51) facing the push chamber 1 (4223) is provided with a push ring groove 1 (511). The outer peripheral surface of the impact piston (51) facing the push chamber 2 (4244) is provided with a push ring groove 1 (511). A push ring groove 2 (513) is provided. When the push chamber 1 (4223) is connected to the push ring groove 1 (511), oil passes through the oil inlet channel 1 (4222) and the push chamber 1 (4223) and enters the push ring groove 1 (511). The oil impacts the inner wall of the push ring groove 1 (511), driving the impact piston (51) to slide in the direction close to the push chamber 2 (4244). The push chamber 2 (4244) is connected to the push ring groove 2 (513). The oil passes through the oil inlet channel 2 (4243) and the push chamber 2 (4244) and enters the push ring groove 2 (513). The oil impacts the inner wall of the push ring groove 2 (513), driving the impact piston (51) to slide in the direction close to the push chamber 1 (4223).

5. A rock drill according to claim 4, characterized in that: The inner wall of the push ring groove one (511) close to the push ring groove two (513) is provided with a push surface one (512); the inclined height of the push surface one (512) increases as the distance to the push ring groove two (513) decreases; the oil in the push ring groove one (511) can impact the push surface one (512) and drive the impact piston (51) close to the push ring groove two (513).

6. A rock drill according to claim 4, characterized in that: The inner wall of the second pushing ring groove (513) close to the first pushing ring groove (511) is provided with a second pushing surface (514); the inclined height of the second pushing surface (514) increases as the distance to the first pushing ring groove (511) decreases; the oil in the second pushing ring groove (513) can impact the second pushing surface (514) and drive the impact piston (51) to approach the first pushing ring groove (511).

7. A rock drill according to claim 4, characterized in that: The second oil inlet channel (4243) is provided with a plurality of them, and the plurality of the second oil inlet channel (4243) are all connected to the limiting cavity (4241), and the limiting cavity (4241) separates the second oil inlet channel (4243) to form two oil inlet sections (4245). The outer peripheral surface of the drill tail thrust sleeve (52) is provided with a plurality of guide cavities (522) at intervals, and the guide cavities (522) correspond to the second oil inlet channel (4243) one by one, and the guide cavities (522) are connected to the two oil inlet sections (4245), and the oil passes through one of the oil inlet sections (4245), the guide cavity (522), the other oil inlet section (4245) in sequence, and enters the second push cavity (4244).

8. A rock drill according to claim 7, characterized in that: The cylinder sleeve (42) comprises a power part (421), an oil inlet part 1 (422), a sealing part (423) and an oil inlet part 2 (424); the flat key 1 (6) is connected to the inner wall of the power part (421); one end of the oil inlet part 1 (422) is coaxially fixed to the end face of the power part (421) away from the motor (2); the other end of the oil inlet part 1 (422) is coaxially fixed to the end face of the sealing part (423); an oil storage gap 1 (4221) for storing oil is reserved between the outer peripheral surface of the oil inlet part 1 (422) and the inner cavity wall of the housing (1); the opening of the oil inlet flow channel 1 (4222) is located on the oil inlet part 1 (422) and is connected to the oil storage gap 1 (4221); the outer peripheral surface of the sealing part (423) is pressed against the inner cavity wall of the housing (1) to form a seal; the sealing part (423) is far away from the motor (2); The end face of the oil inlet part 1 (422) is coaxially fixed to the end face of the oil inlet part 2 (424); the positioning block (8) is connected to the end face of the oil inlet part 2 (424) away from the sealing part (423); an oil storage gap 2 (4242) for storing oil is reserved between the outer peripheral surface of the oil inlet part 2 (424) and the inner cavity wall of the shell (1); the opening of the oil inlet flow channel 2 (4243) is located on the oil inlet part 2 (424) and is connected to the oil storage gap 2 (4242); the impact assembly (5) includes an oil inlet nozzle 1 (53) and an oil inlet nozzle 2 (54); the oil inlet nozzle 1 (53) and the oil inlet nozzle 2 (54) are connected to the surface of the shell (1) at an interval; the inner cavity of the oil inlet nozzle 1 (53) is connected to the oil storage gap 1 (4221); and the inner cavity of the oil inlet nozzle 2 (54) is connected to the oil storage gap 2 (4242).

9. A rock drill according to claim 8, characterized in that: The positioning cavity corresponds to and is connected to the guide cavity (522) in a one-to-one manner. The positioning block (8) is provided with an oil inlet cavity (81) on the end surface facing the positioning cavity. The oil inlet cavity (81) is connected to the second oil storage gap (4242) and the positioning cavity.

10. A rock drill according to claim 1, characterized in that: A locating bearing (7) is coaxially provided at the end of the cylinder sleeve (42) close to the shank spline sleeve (41), and the outer ring of the locating bearing (7) abuts against the inner cavity wall of the housing (1).

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