A rock drill recoverable oil mist air lubricating system and rock drill

Abstract

The application discloses a rock drill recyclable oil mist gas lubrication system and a rock drill. The rock drill recyclable oil mist gas lubrication system is arranged in the interior of the rock drill. The rock drill comprises an impact system, a buffer system, a rotary system and a head system arranged in sequence. The lubrication system comprises an air inlet, a recovery port, a lubrication main channel and a throttling assembly. The air inlet is used for conveying oil mist gas mixed with lubricating oil to the interior of the rock drill. The recovery port is used for recycling the circulated oil mist gas, and the recovery port is the only outlet through which the oil mist gas is discharged out of the rock drill. The lubrication main channel is used for conveying the oil mist gas to the core moving parts of each system for lubrication and cooling. The application has the beneficial effects that the oil mist gas can be prevented from leaking from the gaps of the equipment, and the user can connect an oil mist gas recovery device, a propulsion system guide rail or an oil filter at the recovery port according to actual needs, so that the utilization rate of the oil mist gas is improved.

Description

Technical Field

[0001] This application relates to the field of oil mist lubrication technology for rock drills, and in particular to a recyclable oil mist lubrication system for rock drills and a rock drill. Background Technology

[0002] With the development of technology, people's exploration in underground engineering fields such as mines and tunnels is constantly deepening. As a core piece of equipment in civil construction, rock drills need to withstand high-frequency impact loads and severe vibrations during operation. The quality of its lubrication system directly affects the lifespan of impact components and the overall reliability of the machine. Currently, rock drills generally use non-recovery oil mist lubrication systems. The oil mist escapes through the lubrication gaps and is directly discharged into the atmosphere. On the one hand, this wastes lubricating oil resources, leading to a significant increase in the operating costs of the rock drill. On the other hand, it causes oil mist pollution in the working environment, affecting the health of operators and on-site safety.

[0003] Currently, the lubrication system of rock drills lacks a dynamic lubrication replenishment mechanism synchronized with impact. This means that at the moment the impact piston strikes the drill bit, the drill bit moves forward at extremely high speed, causing a sudden increase in the lubrication gap between the drill bit and the guide sleeve, leading to the rupture of the existing oil film. Existing lubrication systems cannot provide additional lubricating oil at this instant, resulting in dry friction between the drill bit and the guide sleeve during impact, which exacerbates wear and causes abnormal temperature rises and noise. Furthermore, existing systems mostly focus on lubricating the core moving parts, neglecting the lubrication needs of the housing contact surfaces and the impact piston cavity, increasing the risk of seal failure at the housing mating surfaces. Therefore, it is necessary to improve the lubrication system of existing rock drills. Summary of the Invention

[0004] One objective of this application is to provide a recyclable oil mist lubrication system for rock drills that can solve at least one of the defects in the aforementioned background technology.

[0005] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a recoverable oil mist lubrication system for a rock drill, installed inside the rock drill, the rock drill including an impact system, a buffer system, a rotation system, and a head system arranged in sequence, the lubrication system including an air inlet, a recovery outlet, a main lubrication channel, and a throttling component; the air inlet is located in the impact system or the buffer system, used to transport oil mist mixed with lubricating oil into the rock drill; the recovery outlet is located in the head system or extends rearward from the head system to the tail end of the rock drill, used to recover the circulated oil mist, and the recovery outlet is the only outlet for the oil mist to exit the rock drill; the air inlet and the recovery outlet form a front-end air inlet, A through-type lubrication circuit for rear-end recovery; the main lubrication channel passes sequentially through the impact system, buffer system, rotation system, and head system inside the rock drill, used to deliver oil mist to the core moving parts of each system for lubrication and cooling; the throttling component is set in the main lubrication channel and / or the recovery port, used to distribute the air volume or adjust the recovery back pressure according to the actual working conditions; a sealing mechanism is also provided in the head system to prevent oil mist leakage; a guide sleeve and a drill bit that slides with the guide sleeve are provided in the head system, and a lubrication gap is provided between the drill bit and the guide sleeve, one end of the lubrication gap is connected to the recovery port, and the other end is connected to the main lubrication channel.

[0006] With the above setup, oil mist can enter the main lubrication channel through the air inlet to lubricate the inside of the rock drill, and then flow to the lubrication gaps to lubricate the drill bit and guide sleeve, thereby improving the service life of the drill bit and guide sleeve. The recovery port serves as the only outlet for oil mist to exit the rock drill. In conjunction with the guiding effect of the sealing mechanism, all the oil mist after lubrication is discharged from the recovery port. Users can connect an oil mist treatment mechanism at the recovery port to prevent oil mist from leaking from equipment gaps. The throttling component can control the flow rate of oil mist and adjust the proportion of oil mist entering the impact system, buffer system, rotation system, and head system to achieve on-demand lubrication.

[0007] Preferably, the die head system includes a stop ring and a pressurized air passage. The stop ring, facing the rotary system, forms a variable-volume regulating cavity with the stepped surface on the drill bit. The volume of the regulating cavity changes periodically with the axial reciprocating motion of the drill bit. The inlet of the pressurized air passage is connected to the regulating cavity, and the outlet is connected to a section of the main lubrication channel near the lubrication gap. This allows the oil mist in the regulating cavity to be forced into the main lubrication channel when the impact piston strikes the drill bit, reducing the volume of the regulating cavity, thereby improving the efficiency of oil mist delivery to the lubrication gap. With this configuration, the pressurized air passage works in conjunction with the regulating cavity to improve the lubrication effect at the lubrication gap. At the moment the impact piston strikes the drill bit, the pressure difference generated by the reduction in the volume of the regulating cavity automatically forces the oil mist into the lubrication gap through the pressurized air passage. As the drill bit moves axially, the oil mist is quickly replenished to the lubrication gap, maintaining the integrity of the oil film and thus extending the service life of the drill bit and guide sleeve.

[0008] Preferably, the recovery port is connected to an oil mist recovery device, a propulsion system guide rail, or an oil filter. With this configuration, users can connect the oil mist recovery device, propulsion system guide rail, or oil filter at the recovery port according to actual needs. Connecting the oil mist recovery device enables the recycling of lubricating oil; after separation and filtration, the recovered oil mist can be re-injected into the lubricator for reuse, further reducing oil consumption. Connecting the propulsion system guide rail enables the secondary use of oil mist; the recovered oil mist can be directly introduced into the gap between the guide rails of the rock drill propulsion system for lubrication and rust prevention. Connecting the oil mist filter ensures environmentally compliant emissions; in scenarios where recycling is not required, the recovered oil mist can be filtered at the oil filter, trapping the lubricating oil, and the clean air is directly released into the atmosphere.

[0009] Preferably, the throttling assembly includes a first throttling valve and a second throttling valve. The first throttling valve is disposed on the main lubrication channel and is used to regulate the distribution of lubricating air entering each system. The second throttling valve is connected to the recovery port and is used to regulate the recovery back pressure of the recovery port. The throttling orifice diameter of the second throttling valve is larger than that of the first throttling valve. With this configuration, the distribution of lubricating air and the recovery back pressure can be independently controlled through the coordinated adjustment of the first and second throttling valves. The larger throttling orifice diameter of the second throttling valve ensures that the maximum pressure inside the lubrication system is automatically limited to a safe level significantly lower than the intake pressure. Even if the first throttling valve is fully open or the second throttling valve is unexpectedly blocked, the internal pressure of the system will not exceed the design safety threshold, structurally eliminating the risk of seal rupture and shell cracking due to excessive pressure.

[0010] Preferably, the guide sleeve is provided with at least one set of radial through holes, including a first through hole and a second through hole. The first through hole connects the main lubrication channel and the lubrication gap, and the second through hole connects the lubrication gap and the recovery port. This arrangement allows the lubrication gap to be simultaneously connected to both the main lubrication channel and the recovery port via the radial through holes. This ensures that the oil mist in the pressurized air passage can enter the lubrication gap through the first through hole to lubricate the drill bit and the guide sleeve. The lubricated oil mist can then flow into the recovery port through the second through hole, entering a closed-loop recovery circuit, thus achieving directional delivery and fully controllable circulation of the oil mist.

[0011] Preferably, the first and second through holes are radially inclined holes facing each other, with their axes both oriented towards the inner circumferential surface of the guide sleeve. This configuration allows the oil mist to obtain a tangential velocity along the circumferential direction when entering the lubrication gap through the first through hole, thereby forming a stable spiral airflow within the lubrication gap. The opposing inclined design of the second through hole guides the spiral airflow out smoothly, avoiding turbulence. This spiral airflow enhances the uniformity of contact and adhesion stability between the oil mist and the drill bit surface, while effectively suppressing axial aggregation of the oil mist within the lubrication gap and improving the radial diffusion efficiency of the oil mist within the lubrication gap, thereby further improving the continuity and coverage integrity of the lubricating film.

[0012] Preferably, the head system is provided with a mounting hole, the guide sleeve is fixedly installed in the mounting hole, and the sealing mechanism includes a first sealing ring and a second sealing ring. Both the first and second sealing rings are installed on the inner circumferential surface of the mounting hole, and the guide sleeve is located between the first and second sealing rings. This arrangement allows the first and second sealing rings to seal both ends of the guide sleeve, preventing oil mist in the lubrication gap from leaking axially along the guide sleeve to the outside of the head system. The first sealing ring prevents external dust and rock debris from entering the lubrication gap, while the second sealing ring prevents metal wear debris from the rotating system from entering the lubrication gap in the opposite direction, avoiding these hard particles scratching the mating surface between the drill bit and the guide sleeve. This ensures that the recovery port is the only external path for oil mist to exit.

[0013] Preferably, a lubrication bypass is included, which is connected to the main lubrication channel and is used to deliver oil mist to the housing contact surface and transmission components. With this configuration, the lubrication bypass can supplement lubrication for the housing contact surface and transmission components outside the main lubrication channel, comprehensively reducing motion friction and wear.

[0014] Preferably, the system includes a balancing oil passage located on the housing wall of the impact system. The two ends of the balancing oil passage are connected to the main lubrication channel and the piston chamber within the impact system, respectively. This configuration, by connecting the main lubrication channel and the piston chamber, balances the internal air pressure of the piston chamber, reduces the resistance to the piston's reciprocating motion, ensures smooth and stable impact action, and simultaneously achieves synchronous oil lubrication of the piston chamber, further improving the overall reliability and service life of the machine.

[0015] Another object of this application is to provide a rock drill that can solve at least one of the defects in the above-mentioned background art.

[0016] To achieve at least one of the above objectives, the technical solution adopted in this application is: a rock drill, including a body, wherein the above-mentioned rock drill recyclable oil mist lubrication system is installed in the body.

[0017] Compared with the prior art, the beneficial effects of this application are as follows: (1) The recovery port is the only outlet for oil mist to be discharged from the outside of the rock drill. It can work with the sealing mechanism to guide the flow so that all the oil mist after lubrication is discharged from the recovery port, avoiding leakage of oil mist from the gaps in the equipment. The oil mist flows smoothly along the axial direction with low pressure loss, so that a stable positive pressure is formed inside the whole machine, effectively blocking the intrusion of external dust. The throttling component can control the flow rate of oil mist and adjust the proportion of oil mist entering the impact system, buffer system, rotation system and head system to achieve lubrication on demand. Users can connect an oil mist recovery device, a propulsion system guide rail or an oil filter at the recovery port according to actual needs.

[0018] (2) The pressurized air passage can work with the regulating chamber to improve the lubrication effect at the lubrication gap. At the moment when the impact piston hits the drill bit, the pressure difference generated by the reduction of the volume of the regulating chamber will automatically press the oil mist into the lubrication gap through the pressurized air passage, accurately replenish the lubrication gap that increases at the moment of impact, maintain the integrity of the oil film, and thus improve the service life of the drill bit and the guide sleeve. Moreover, the flow direction of the oil mist is consistent with the flow direction of the pressurized air in the regulating chamber, and will not cause airflow interference.

[0019] (3) The lubrication bypass can supplement the lubrication of the housing contact surface and transmission components outside the lubrication main channel, and comprehensively reduce motion friction and wear; the balance oil channel connects the lubrication main channel and the piston chamber, which can balance the air pressure inside the piston chamber, reduce the running resistance of the piston reciprocating motion, ensure smooth and stable impact action, and realize synchronous oil supply lubrication of the piston chamber, further improving the reliability and service life of the whole machine. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the rock drill in this application.

[0021] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0022] Figure 3 This is a schematic diagram of the installation structure of the guide sleeve and the drill bit in this application.

[0023] Figure 4 This is a schematic diagram of the structure of the first throttle valve in this application.

[0024] In the diagram: 1. Impact system; 11. Impact piston; 12. Piston chamber; 100. Air inlet; 101. Recovery port; 2. Buffer system; 200. Lubrication main channel; 201. Lubrication bypass; 202. Balance oil channel; 3. Rotation system; 300. Adjustment chamber; 4. Head system; 41. Guide sleeve; 42. Chisel tail; 43. Stop ring; 44. Pressurized air channel; 45. Mounting hole; 400. Lubrication gap; 51. First throttle valve; 52. Second throttle valve; 6. Sealing mechanism; 61. First sealing ring; 62. Second sealing ring; 601. First through hole; 602. Second through hole. Detailed Implementation

[0025] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0026] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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 orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0027] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0028] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0029] One aspect of this application provides a recoverable oil mist lubrication system for a rock drill, one preferred embodiment of which is, for example... Figure 1 As shown, the recyclable oil mist lubrication system of the rock drill is located inside the rock drill. The rock drill includes an impact system 1, a buffer system 2, a rotation system 3, and a head system 4 arranged in sequence. The lubrication system includes an air inlet 100, a recovery port 101, a main lubrication channel 200, and a throttling component. The air inlet 100 is located in the impact system 1 (or the buffer system 2) and is used to deliver oil mist mixed with lubricating oil into the rock drill. The recovery port 101 is located in the head system 4 (or can extend from the head system 4 to the rear end of the rock drill) and is used to recover the circulated oil mist. The air inlet 100 and the recovery port 101 form a through-type lubrication circuit with air intake at the front and recovery at the rear. The recovery port 101 is the only outlet for oil mist to exit the rock drill, ensuring that oil mist in the lubrication system can only be discharged through the recovery port 101. Users can connect an oil mist treatment mechanism at the recovery port 101 to recover and reuse the oil mist at the recovery port 101.

[0030] Specifically, such as Figure 1 As shown, the main lubrication channel 200 passes sequentially through the impact system 1, buffer system 2, rotary system 3, and head system 4 within the rock drill, delivering oil mist to the core moving parts of each system for lubrication and cooling. A throttling component is located in the main lubrication channel 200 and / or the recovery port 101. This component can distribute the air volume or adjust the back pressure according to actual working conditions, regulating the proportion of oil mist entering the impact system 1, buffer system 2, rotary system 3, and head system 4 to achieve on-demand lubrication. A sealing mechanism 6 is also installed within the head system 4 to prevent oil mist leakage. Understandably, in existing technologies, rock drills generally employ non-recovery oil mist lubrication systems, where oil mist escapes directly from the machine's gaps and is discharged into the atmosphere. This wastes lubricating oil, significantly increasing the operating costs of the rock drill, and also causes oil mist pollution in the working environment, affecting the health of operators and on-site safety. In this application, however, the oil mist in the lubrication system can only be collected centrally through the recovery port 101, preventing disorderly leakage of oil mist from equipment gaps. This not only reduces lubricating oil consumption but also prevents oil mist from impacting the external environment.

[0031] Specifically, such as Figure 1 and Figure 3As shown, the head system 4 is equipped with a guide sleeve 41 and a drill bit 42 that slides with the guide sleeve 41. A lubrication gap 400 is provided between the drill bit 42 and the guide sleeve 41. One end of the lubrication gap 400 is connected to the recovery port 101, and the other end is connected to the lubrication main channel 200. When the rock drill is working, oil mist can be delivered to the lubrication gap 400 through the lubrication main channel 200 to lubricate the guide sleeve 41 and the drill bit 42, thereby reducing wear and improving drilling efficiency.

[0032] Furthermore, such as Figure 1 and Figure 2 As shown, the head system 4 is equipped with a stop ring 43 and a pressurizing air passage 44. The side of the stop ring 43 facing the rotary system 3 and the stepped surface on the drill bit 42 form a variable volume regulating cavity 300. The volume of the regulating cavity 300 changes periodically with the axial reciprocating motion of the drill bit 42. The inlet of the pressurizing air passage 44 is connected to the regulating cavity 300, and the outlet is connected to a section of the lubrication main passage 200 near the lubrication gap 400. This is used to pressurize the oil mist in the regulating cavity 300 into the lubrication main passage 200 when the impact piston 11 hits the drill bit 42 and reduces the volume of the regulating cavity 300, thereby improving the delivery efficiency of the oil mist to the lubrication gap 400.

[0033] It should be noted that the pressurized air passage 44 can work with the regulating chamber 300 to improve the lubrication effect at the lubrication gap 400. At the moment when the impact piston 11 strikes the drill bit 42, the pressure difference generated by the reduction in the volume of the regulating chamber 300 is used to automatically pressurize the oil mist into the main lubrication passage 200 through the pressurized air passage 44, thereby quickly replenishing the oil mist to the lubrication gap 400, maintaining the integrity of the oil film, and improving the service life of the drill bit 42 and the guide sleeve 41.

[0034] In this embodiment, the oil mist recovery methods include, but are not limited to, the following three: Recovery Method 1: The recovery port 101 is connected to an oil mist recovery device to realize the recycling of lubricating oil; after the recovered oil mist is separated and filtered, the lubricating oil can be re-injected into the oiler for reuse, further reducing oil consumption.

[0035] Recovery Method 2: The recovery port 101 is connected to the propulsion system guide rail, which is used to realize the secondary utilization of oil mist; the recovered oil mist is directly introduced into the gap of the guide rail of the rock drill propulsion system to lubricate and prevent rust.

[0036] Recycling Method 3: An oil filter is connected to the recycling port 101 to achieve environmentally compliant emissions; for scenarios where recycling is not required, the recycled oil mist can be filtered at the oil filter, and after the lubricating oil is trapped, the clean air is directly discharged into the atmosphere.

[0037] It should be noted that all three recycling methods mentioned above can meet the requirements of this application, and those skilled in the art can choose according to their actual needs.

[0038] In this embodiment, as Figure 1 and Figure 4 As shown, the throttling assembly includes a first throttling valve 51 and a second throttling valve 52. The first throttling valve 51 is located in the lubrication main channel 200 and is used to regulate the distribution of lubricating air entering each system. The second throttling valve 52 is connected to the recovery port 101 and is used to regulate the recovery back pressure of the recovery port 101. The first throttling valve 51 can cooperate with the second throttling valve 52 to achieve independent control of the distribution of lubricating air and the recovery back pressure.

[0039] Specifically, the orifice diameter on the second throttle valve 52 is larger than that on the first throttle valve 51, to ensure that the maximum pressure inside the lubrication system is automatically limited to a safe level significantly lower than the intake pressure. Even if the first throttle valve 51 is fully open or the second throttle valve 52 is unexpectedly blocked, the pressure inside the lubrication system will not exceed the design safety threshold, thus structurally eliminating the risk of seal rupture and shell cracking due to excessive pressure.

[0040] As a supplement, since the oil mist flow within the main lubrication channel 200 is directed to multiple areas, precise control of the oil mist flow rate in each area is required. Therefore, independently adjustable first throttle valves 51 can be installed at different branch nodes of the main lubrication channel 200 to construct a segmented flow control system, enabling on-demand oil supply and precise adaptation for each lubrication branch. The number of first throttle valves 51 can be selected by those skilled in the art according to actual needs, but it must be ensured that the throttling orifice diameter on the second throttle valve 52 is greater than the sum of the throttling orifice diameters on all the first throttle valves 51, to ensure that the total flow rate of the lubrication system is always controlled within the recovery back pressure adjustment range.

[0041] In this embodiment, as Figure 3 As shown, the guide sleeve 41 is provided with at least one set of radial through holes, including a first through hole 601 and a second through hole 602. The first through hole 601 is used to connect the lubrication main channel 200 and the lubrication gap 400, and the second through hole 602 is used to connect the lubrication gap 400 and the recovery port 101. The radial through holes can connect the lubrication gap 400 to both the lubrication main channel 200 and the recovery port 101, ensuring that the oil mist in the pressurized air channel 44 can enter the lubrication gap 400 through the lubrication main channel 200 and the first through hole 601 to lubricate the shank 42 and the guide sleeve 41. The lubricated oil mist can flow into the recovery port 101 through the second through hole 602 and enter the closed-loop recovery circuit, realizing the directional delivery and fully controllable circulation of the oil mist.

[0042] Specifically, such as Figure 3As shown, the first through hole 601 and the second through hole 602 are radially inclined holes facing each other, with their axes both oriented towards the inner circumferential surface of the guide sleeve 41. When oil mist enters the lubrication gap 400 through the first through hole 601, it acquires a tangential velocity along the circumferential direction, forming a stable spiral airflow within the lubrication gap 400. This spiral airflow enhances the uniformity of contact and adhesion stability between the oil mist and the surface of the drill bit 42, effectively suppresses axial aggregation of oil mist within the lubrication gap 400, and improves the radial diffusion efficiency of oil mist within the lubrication gap 400, thereby further enhancing the continuity and coverage integrity of the lubricating film. The inclined design of the second through hole 602 guides the spiral airflow out smoothly, avoiding turbulence.

[0043] It should be noted that the tilt angle of the first through hole 601 and the second through hole 602 is 15°~45°. Of course, those skilled in the art can adjust the specific tilt angle according to actual needs, and no further limitations are made here.

[0044] In this embodiment, as Figure 3 As shown, the headstock system 4 is provided with a mounting hole 45, and the guide sleeve 41 is fixedly installed in the mounting hole 45. The sealing mechanism 6 includes a first sealing ring 61 and a second sealing ring 62, both of which are installed on the inner circumferential surface of the mounting hole 45. The guide sleeve 41 is located between the first sealing ring 61 and the second sealing ring 62. When the drill bit 42 is located in the mounting hole 45, the outer circumferential surface of the drill bit 42 is tightly fitted with the first sealing ring 61 and the second sealing ring 62, forming a bidirectional dynamic sealing structure, which effectively prevents oil mist from leaking axially in the lubrication gap 400. The two sealing rings work together to significantly improve the sealing reliability and service life.

[0045] Understandably, the first sealing ring 61 and the second sealing ring 62 seal both ends of the guide sleeve 41 to prevent oil mist in the lubrication gap 400 from leaking axially along the guide sleeve 41 to the outside of the head system 4. The first sealing ring 61 can block external dust and rock chips from entering the lubrication gap 400, and the second sealing ring 62 can block metal wear debris in the rotary system 3 from entering the lubrication gap 400 in the reverse direction, thus preventing these hard particles from scratching the mating surface between the drill bit 42 and the guide sleeve 41. This ensures that the recovery port 101 is the only external discharge path for oil mist.

[0046] It should be noted that the materials and models of the first sealing ring 61 and the second sealing ring 62 are existing technologies, and those skilled in the art can choose them themselves. Further details will not be provided here.

[0047] In this embodiment, as Figure 1As shown, the rock drill's recoverable oil mist lubrication system also includes a lubrication bypass 201 and a balancing oil passage 202. The lubrication bypass 201 is connected to the main lubrication passage 200 and is used to supplement lubrication to the housing contact surfaces and transmission components outside the main lubrication passage 200, comprehensively reducing motion friction and wear. The balancing oil passage 202 is located on the housing wall of the impact system 1, and its two ends are connected to the main lubrication passage 200 and the piston chamber 12 within the impact system 1, respectively. The balancing oil passage 202 can balance the air pressure inside the piston chamber 12, reduce the running resistance of the piston's reciprocating motion, ensure smooth and stable impact action, and simultaneously achieve synchronous oil lubrication of the piston chamber 12, further improving the overall machine's operational reliability and service life.

[0048] Another aspect of this application provides a rock drill, one preferred embodiment of which is, for example... Figure 1 As shown, it includes the body, which is equipped with the aforementioned rock drill's recyclable oil mist lubrication system.

[0049] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A recyclable oil mist lubrication system for a rock drill, disposed inside the rock drill, the rock drill comprising an impact system (1), a buffer system (2), a rotation system (3), and a head system (4) arranged in sequence, characterized in that, The lubrication system includes an air inlet (100), a recovery port (101), a lubrication main channel (200), and a throttling component; the air inlet (100) is located in the impact system (1) or the buffer system (2) to deliver oil mist mixed with lubricating oil into the rock drill; the recovery port (101) is located in the head system (4) or extends from the head system (4) to the tail end of the rock drill to recover the oil mist after circulation, and the recovery port (101) is the only outlet for the oil mist to be discharged outside the rock drill; the air inlet (100) and the recovery port (101) form a through lubrication circuit with air intake at the front end and recovery at the rear end; The main lubrication channel (200) passes sequentially through the impact system (1), buffer system (2), rotation system (3), and head system (4) inside the rock drill, and is used to deliver oil mist to the core moving parts of each system for lubrication and cooling; the throttling component is set in the main lubrication channel (200) and / or the recovery port (101), and is used to distribute the air volume or adjust the back pressure of recovery according to the actual working conditions; a sealing mechanism (6) is also provided in the head system (4), and the sealing mechanism (6) is used to prevent oil mist from leaking out; The head system (4) is provided with a guide sleeve (41) and a slidable shank (42) that slides with the guide sleeve (41). A lubrication gap (400) is provided between the shank (42) and the guide sleeve (41). One end of the lubrication gap (400) is connected to the recovery port (101), and the other end is connected to the lubrication main channel (200).

2. The rock drill oil mist recovery lubrication system as described in claim 1, characterized in that, The head system (4) is provided with a stop ring (43) and a pressurizing air passage (44). The stop ring (43) facing the rotary system (3) and the stepped surface on the shank (42) form a variable volume regulating cavity (300). The volume of the regulating cavity (300) changes periodically with the axial reciprocating motion of the shank (42). The inlet of the pressurizing air passage (44) is connected to the regulating cavity (300), and the outlet is connected to a section of the lubrication main passage (200) near the lubrication gap (400). When the impact piston (11) hits the shank (42) and reduces the volume of the regulating cavity (300), the oil mist in the regulating cavity (300) is forced into the lubrication main passage (200), thereby improving the delivery efficiency of the oil mist to the lubrication gap (400).

3. The rock drill oil mist recovery lubrication system as described in claim 1, characterized in that, The recovery port (101) is connected to an oil mist recovery device, a propulsion system guide rail, or an oil filter.

4. The rock drill oil mist recovery lubrication system as described in claim 1, characterized in that, The throttling assembly includes a first throttling valve (51) and a second throttling valve (52). The first throttling valve (51) is located in the lubrication main channel (200) and is used to adjust the distribution of lubricating gas entering each system. The second throttling valve (52) is connected to the recovery port (101) and is used to adjust the recovery back pressure of the recovery port (101). The throttling orifice diameter of the second throttling valve (52) is larger than that of the first throttling valve (51).

5. The rock drill oil mist recovery lubrication system as described in claim 1, characterized in that, The guide sleeve (41) is provided with at least one set of radial through holes, the radial through holes including a first through hole (601) and a second through hole (602). The first through hole (601) is used to connect the lubrication main channel (200) and the lubrication gap (400), and the second through hole (602) is used to connect the lubrication gap (400) and the recovery port (101).

6. The rock drill recyclable oil mist lubrication system as described in claim 5, characterized in that, The first through hole (601) and the second through hole (602) are radially inclined holes that are inclined towards each other. The axes of the first through hole (601) and the second through hole (602) are both arranged towards the inner circumferential surface of the guide sleeve (41).

7. The rock drill oil mist recovery lubrication system as described in claim 1, characterized in that, The head system (4) is provided with a mounting hole (45), and the guide sleeve (41) is fixedly installed in the mounting hole (45). The sealing mechanism (6) includes a first sealing ring (61) and a second sealing ring (62). The first sealing ring (61) and the second sealing ring (62) are both installed on the inner circumferential surface of the mounting hole (45), and the guide sleeve (41) is located between the first sealing ring (61) and the second sealing ring (62).

8. The rock drill oil mist recovery lubrication system as described in claim 1, characterized in that, It includes a lubrication bypass (201), which is connected to the lubrication main channel (200) and is used to deliver oil mist to the housing contact surface and transmission components.

9. The rock drill recyclable oil mist lubrication system as described in claim 1, characterized in that, It includes a balance oil passage (202), which is opened on the housing wall of the impact system (1). The two ends of the balance oil passage (202) are respectively connected to the lubrication main passage (200) and the piston chamber (12) in the impact system (1).

10. A rock drill, comprising a body, characterized in that, The machine body is equipped with a rock drill recyclable oil mist lubrication system as described in any one of claims 1-9.

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