Oil mist amount control system and method for rock drill

Abstract

The invention discloses a rock drill oil mist amount control system and method. The rock drill oil mist amount control system comprises a lubricating oil pot, an electromagnetic lubricating oil pump and an adjustable throttling valve. The lubricating oil pot is connected with the input end of the electromagnetic lubricating oil pump through a first oil way, and the output end of the electromagnetic lubricating oil pump is provided with a second oil way used for being connected with a rock drill. A third oil way is arranged between the second oil way and the lubricating oil pot, and the adjustable throttling valve is arranged on the third oil way. The lubricating oil supply device is applied to the field of tunnel construction, lubricating oil can be supplied to the rock drill in a small amount and multiple times, the continuity of connection of the lubricating oil of the rock drill is guaranteed, dry grinding and accelerated loss of internal parts of the rock drill are avoided, the problem that the amount of the lubricating oil is too large in a short time can be solved, spider patterns are effectively prevented, and the service life of a bit shank is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly to an oil mist quantity control system and method for a rock drill. Background Art

[0002] In tunnel or mine support projects, the hydraulic rock drill, an important component of the jumbo, is equipped with its own lubrication system, and the lubricating oil quantity is provided by the oil mist system of the main engine. Different hydraulic rock drills require different lubricating oil quantities. For example, the lubricating oil quantity of one rock drill is 3 cc / min, and that of another rock drill is 0.6 cc / min.

[0003] During the impact process of the rock drill, if the lubricating oil quantity is too small, insufficient lubrication will cause dry grinding of internal components and accelerate wear; if the lubricating oil quantity is too large, spider patterns will appear on the contact surface between the impact piston and the drill steel shank. These patterns will greatly reduce the service life of the drill steel shank. The mechanism for the formation of spider patterns is as follows: The impact of the rock drill relies on the repeated hitting action of the impact piston on the drill steel shank. When the oil quantity is appropriate, the oil is evenly sprayed onto the contact surface between the impact piston and the drill steel shank under the action of gas; if the oil quantity is too large, it will accumulate locally in the center. When hitting, the two end faces hit the accumulated oil under the action of a great force, and the oil spreads around. After multiple hits, spider-like patterns that spread from the center will be formed on the end faces.

[0004] Currently, due to process limitations, electromagnetic lubricating oil pumps with a small oil output are lacking in the market. The general model pumps 0.2 cc of lubricating oil at a time. If the requirement of 0.6 cc / min for the rock drill is to be met, it only needs to be pumped 3 times a minute, that is, once every 15 seconds. However, this will lead to discontinuous lubrication, with the lubricating oil quantity being too large for a period of time and too small for a period of time. Summary of the Invention

[0005] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides an oil mist quantity control system and method for a rock drill, which can provide lubricating oil in small amounts and multiple times according to the lubricating oil quantity requirement of the rock drill, while ensuring the continuity of the lubricating oil access to the rock drill and avoiding the problem of excessive lubricating oil quantity in a short period of time.

[0006] To achieve the above object, the present invention provides an oil mist quantity control system for a rock drill, including a lubricating oil pot, an electromagnetic lubricating oil pump, and an adjustable throttle valve; The lubricating oil pot is connected to the input end of the electromagnetic lubricating oil pump through a first oil path, and the output end of the electromagnetic lubricating oil pump is provided with a second oil path for connecting to the rock drill; A third oil path is provided between the second oil path and the lubricating oil pot, and the adjustable throttle valve is arranged on the third oil path.

[0007] In one embodiment, a flow sensor is provided on the second oil path, and the flow sensor is located downstream of the connection of the third oil path to the second oil path.

[0008] In one embodiment, the lubricating oil pot is located above the electromagnetic lubricating oil pump so that the lubricating oil flows into the electromagnetic lubricating oil pump under the action of gravity.

[0009] In one embodiment, a liquid level sensor is provided in the lubricating oil pot.

[0010] In one embodiment, the inlet of the third oil path on the lubricating oil pot is higher than the maximum oil level height of the lubricating oil pot.

[0011] In one embodiment, the adjustable throttle valve includes a valve body and a valve core. Inlets and outlets are respectively provided at both ends of the valve body, and a flow channel communicating the inlet and the outlet is provided in the valve body; The valve core is located on the side of the valve body, and the first end of the valve core is located in the flow channel. A driving member is provided at the second end of the valve core for driving the valve core to displace and change the cross-sectional area of the flow channel.

[0012] In one embodiment, a first protrusion and a second protrusion are provided on the inner wall of the valve body, and a tapered damping hole is formed between the first protrusion and the second protrusion; The first end of the valve core is a tapered structure adapted to the damping hole, and the first end of the valve core is located in the damping hole.

[0013] In one embodiment, multiple sets of the electromagnetic lubricating oil pump and the adjustable throttle valve are provided in a supporting manner for controlling the oil mist amount of multiple rock drills.

[0014] To achieve the above object, the present invention further provides a method for controlling the oil mist amount of a rock drill. Using the above-mentioned rock drill oil mist amount control system, the method for controlling the oil mist amount of a rock drill includes the following steps: Step 1, obtain the required lubricating oil amount per minute of the rock drill and set the pumping times per minute of the electromagnetic lubricating oil pump; Step 2, calculate the theoretical lubricating oil access amount of the rock drill each time the electromagnetic lubricating oil pump pumps based on the required lubricating oil amount and the pumping times; Step 3, adjust the back pressure of the adjustable throttle valve; Step 4, obtain the real-time lubricating oil access amount of the rock drill and determine whether the difference between the real-time lubricating oil access amount and the theoretical lubricating oil access amount is less than a threshold value: If so, control the rock drill to perform an impact action; Otherwise, return to Step ③.

[0015] In one embodiment, during the process of performing step 3 and step 4, the liquid level height in the lubricating oil pot is also monitored in real time, and when the liquid level height is lower than the height threshold, the rock drill is controlled to stop the impact action.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: 1. By adding an adjustable throttle valve between the output oil circuit of the electromagnetic lubricating oil pump and the lubricating oil pot, the present invention can adjust the lubricating oil throughput of the adjustable throttle valve by changing the back pressure of the adjustable throttle valve within the allowable range, and then control the rock drill to work, so as to meet the actual lubricating oil access amount of the rock drill. Thus, the lubricating oil can be provided to the rock drill in small amounts and multiple times, which not only ensures the continuity of the lubricating oil access of the rock drill, avoids dry grinding and accelerated wear of the internal components of the rock drill, but also avoids the problem of excessive lubricating oil amount in a short time, effectively prevents the generation of spider lines, and improves the service life of the drill steel tail; 2. In the preferred embodiment of the present invention, a liquid level sensor can be arranged in the lubricating oil pot, so as to be able to monitor in real time whether the lubricating oil level in the lubricating oil pot is lower than the height threshold, and then be able to remind the operator to stop the impact action of the rock drill in time when the lubricating oil level is lower than the height threshold, avoiding dry grinding and accelerated wear of the internal components of the rock drill; 3. In the preferred embodiment of the present invention, the connection port position of the third oil circuit on the lubricating oil pot can be set higher than the maximum oil level height of the lubricating oil pot, so that the lubricating oil passing through the adjustable throttle valve can be guided back into the lubricating oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0018] Figure 1 It is a schematic structural diagram of the rock drill oil mist amount control system in Embodiment 1 of the present invention; Figure 2 It is a cross-sectional view of the adjustable throttle valve in Embodiment 1 of the present invention; Figure 3 It is a schematic diagram of another implementation manner of the rock drill oil mist amount control system in Embodiment 1 of the present invention; Figure 4 It is a flowchart of the rock drill oil mist amount control method in Embodiment 2 of the present invention.

[0019] Reference Numerals in the Drawings: Lubricating oil pot 1, electromagnetic lubricating oil pump 2, adjustable throttle valve 3, valve body 301, oil inlet 3011, oil outlet 3012, flow channel 3013, first protrusion 3014, second protrusion 3015, damping hole 3016, valve core 302, driving member 3021, first oil circuit 4, second oil circuit 5, tee 6, third oil circuit 7, flow sensor 8, liquid level sensor 9, rock drill 10, first one-way valve 11, second one-way valve 12.

[0020] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, a physical connection or a wireless communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] Embodiment 1 As Figure 1 shown in the figure, a rock drill oil mist quantity control system disclosed in this embodiment mainly includes a lubricating oil pot 1, an electromagnetic lubricating oil pump 2 and an adjustable throttle valve 3. The lubricating oil pot 1 is connected to the input end of the electromagnetic lubricating oil pump 2 through a first oil passage 4. The output end of the electromagnetic lubricating oil pump 2 is provided with a second oil passage 5 for connecting to the rock drill 10. A tee joint 6 is arranged on the second oil passage 5. A third oil passage 7 is provided between the tee joint 6 and the lubricating oil pot 1, and the adjustable throttle valve 3 is arranged on the third oil passage 7.

[0027] In specific applications, the operation process of the rock drill oil mist quantity control system is as follows: After the electromagnetic lubricating oil pump 2 pumps the lubricating oil in the lubricating oil pot 1 into the second oil passage 5, due to the existence of the third oil passage 7, the hydraulic oil output by the electromagnetic lubricating oil pump 2 is divided into two parts: the first part of the lubricating oil enters the rock drill 10 through the second oil passage 5, and the second part of the lubricating oil is guided back to the lubricating oil pot 1 through the third oil passage 7. Due to the existence of the adjustable throttle valve 3 on the third oil passage 7, the amount of the second part of the lubricating oil can be changed by adjusting the back pressure of the adjustable throttle valve 3. And the amount of lubricating oil pumped out by the electromagnetic lubricating oil pump 2 each time is fixed. While the amount of the second part of the lubricating oil changes, the adjustment of the amount of the first part of the lubricating oil can be achieved. Therefore, lubricating oil can be provided to the rock drill 10 in small amounts and multiple times according to the requirements of the rock drill 10, which not only ensures the continuity of the lubricating oil access of the rock drill 10, avoids dry grinding and accelerated wear of the internal components of the rock drill 10, but also avoids the problem of excessive lubricating oil amount in a short time, effectively prevents the generation of spider lines, and improves the service life of the drill tail.

[0028] In the specific implementation process, a flow sensor 8 is arranged on the second oil passage 5, and the flow sensor 8 is located downstream of the connection of the third oil passage 7 on the second oil passage 5 to monitor the real-time lubricating oil access amount of the rock drill 10, so as to serve as the adjustment feedback of the adjustable throttle valve 3 and ensure the adjustment accuracy of the adjustable throttle valve 3.

[0029] As a preferred implementation manner, the lubricating oil pot 1 is located above the electromagnetic lubricating oil pump 2 so that the lubricating oil in the lubricating oil pot 1 can automatically flow into the electromagnetic lubricating oil pump 2 through the first oil passage 4 under the action of gravity.

[0030] As a preferred embodiment, a liquid level sensor 9 is provided inside the lubricating oil pot 1, so as to be able to monitor in real time whether the lubricating oil level in the lubricating oil pot 1 is lower than the height threshold, and then be able to remind the operator to stop the impact action of the rock drill 10 in time when the lubricating oil level is lower than the height threshold, avoiding dry grinding and accelerated wear of the internal components of the rock drill 10.

[0031] As a preferred embodiment, the connection port of the third oil circuit 7 on the lubricating oil pot 1 is higher than the maximum oil level height of the lubricating oil pot 1, so that the lubricating oil passing through the adjustable throttle valve 3 can be guided back into the lubricating oil tank.

[0032] Reference Figure 2 , the adjustable throttle valve 3 includes a valve body 301 and a valve core 302. An oil inlet 3011 and an oil outlet 3012 are respectively provided at both ends of the valve body 301, and a flow channel 3013 communicating the oil inlet 3011 and the oil outlet 3012 is provided inside the valve body 301. The valve core 302 is located at the side of the valve body 301, and the first end of the valve core 302 is located in the flow channel 3013. A driving member 3021 is provided at the second end of the valve core 302 for driving the valve core 302 to displace and change the cross-sectional area of the flow channel 3013. Specifically, the valve core 302 can be connected to the valve body 301 by means of threaded connection, and the driving member 3021 can be a knob or a handle provided at the second end of the valve core 302, etc. A first protrusion 3014 and a second protrusion 3015 are provided on the inner wall of the valve body 301, and a tapered damping hole 3016 is formed between the first protrusion 3014 and the second protrusion 3015. The first end of the valve core 302 is a tapered structure adapted to the damping hole 3016, and the first end of the valve core 302 is located in the damping hole 3016. During application, by rotating the valve core 302 through the driving member 3021, the feeding depth of the first end of the valve core 302 in the damping hole 3016 can be changed, thereby changing the flow area of the damping hole 3016, and further controlling the generated back pressure and adjusting the amount of lubricating oil passing through the flow channel 3013.

[0033] In the specific implementation process, a first one-way valve 11 is provided at a position on the first oil circuit 4 close to the input end of the electromagnetic lubricating oil pump 2 to prevent the lubricating oil in the electromagnetic lubricating oil pump 2 from flowing back. A second one-way valve 12 is provided at a position on the second oil circuit 5 close to the output end of the electromagnetic lubricating oil pump 2, that is, the second one-way valve 12 is located between the electromagnetic lubricating oil pump 2 and the tee 6, to prevent the lubricating oil in the second oil circuit 5 from flowing back.

[0034] In the specific implementation process, multiple groups of electromagnetic lubricating oil pumps 2 and adjustable throttle valves 3 are provided to control the oil mist amount of multiple rock drills 10. For example Figure 3 Another implementation manner of the oil mist amount control system of the rock drill in this embodiment is shown. At this time, two groups of electromagnetic lubricating oil pumps 2, adjustable throttle valves 3, and flow sensors 8 are provided, respectively providing lubricating oil for two rock drills 10.

[0035] Example 2 Based on the oil mist volume control system of the rock drill in Example 1, this example discloses a method for controlling the oil mist volume of a rock drill. Refer to Figure 4 , the method for controlling the oil mist volume of the rock drill specifically includes the following steps: Step 1, obtain the required lubricating oil volume per minute of the rock drill and set the pumping times per minute of the electromagnetic lubricating oil pump 2; Step 2, calculate the theoretical lubricating oil access volume of the rock drill each time the electromagnetic lubricating oil pump 2 pumps based on the required lubricating oil volume and the pumping times; Step 3, adjust the back pressure of the adjustable throttle valve 3; Step 4, obtain the real-time lubricating oil access volume of the rock drill and determine whether the difference between the real-time lubricating oil access volume and the theoretical lubricating oil access volume is less than the threshold: If so, control the rock drill to perform the impact action; Otherwise, return to Step 3.

[0036] In the specific application process of Step 3, the lubricating oil profit passing through the oil path of the back pressure of the adjustable throttle valve 3 can be calculated by calculating the theoretical lubricating oil access volume and the rated pumping oil volume of the electromagnetic lubricating oil pump 2, so as to estimate the cross-sectional area of the damping hole on the adjustable throttle valve 3, thereby providing a basis for the adjustment of the adjustable throttle valve 3 and improving its adjustment efficiency. Take the required lubricating oil volume per minute of the rock drill as 0.6 cc / min and the rated pumping oil volume of the electromagnetic lubricating oil pump 2 as 0.2 cc as an example. Under normal conditions, to meet the requirement of 0.6 cc / min of the rock drill, the electromagnetic lubricating oil pump 2 only needs to pump 3 times per minute. To provide lubricating oil to the rock drill in small amounts and multiple times, the pumping times per minute of the electromagnetic lubricating oil pump 2 can be set to 15 times, that is, 0.04 cc of lubricating oil is pumped to the rock drill at a time, with an interval of 4 seconds each time. Therefore, the theoretical lubricating oil access volume of the rock drill is 0.04 cc, and the theoretical lubricating oil passing volume of the adjustable throttle valve 3 is 0.2 cc - 0.04 cc = 0.16 cc. Set the flow rate of the adjustable throttle valve 3 directly to 0.16 cc / s. According to = 0.16 cc / s and the maximum flow rate of the adjustable throttle valve 3, estimate the estimated value of the cross-sectional area of the damping hole, that is , is the maximum value of the cross-sectional area of the damping hole. After obtaining the estimated value of the cross-sectional area of the damping hole, the cross-sectional area of the damping hole of the adjustable throttle valve 3 can be first adjusted to for preliminary adjustment, and then fine-tuned according to the real-time lubricating oil access volume of the rock drill, thereby improving the adjustment efficiency.

[0037] As a preferred embodiment, during the process of performing Step 3 and Step 4, the liquid level height in the lubricating oil pot 1 is also monitored in real time, and when the liquid level height is lower than the height threshold, the rock drill is controlled to stop the impact action, thereby avoiding dry grinding and accelerating wear of the internal components of the rock drill.

[0038] The above are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the protection scope of the present invention.

Claims

1. An oil mist quantity control system for a rock drill, characterized in that, It includes a lubricating oil pot, an electromagnetic lubricating oil pump and an adjustable throttle valve; The lubricating oil pot is connected to the input end of the electromagnetic lubricating oil pump through a first oil passage, and a second oil passage is provided at the output end of the electromagnetic lubricating oil pump for connecting to a rock drill; A third oil passage is provided between the second oil passage and the lubricating oil pot, and the adjustable throttle valve is provided on the third oil passage.

2. The oil mist quantity control system of the rock drill according to claim 1, wherein A flow sensor is provided on the second oil passage, and the flow sensor is located downstream of the connection of the third oil passage to the second oil passage.

3. The oil mist amount control system of the rock drill according to claim 1, characterized in that, The lubricating oil pot is located above the electromagnetic lubricating oil pump so that the lubricating oil flows into the electromagnetic lubricating oil pump under the action of gravity.

4. The oil mist quantity control system of the rock drill according to claim 1, characterized in that A liquid level sensor is provided in the lubricating oil pot.

5. The oil mist amount control system of the rock drill according to claim 1, characterized in that The access port of the third oil passage on the lubricating oil pot is higher than the maximum oil level height of the lubricating oil pot.

6. The oil mist amount control system of the rock drill according to any one of claims 1 to 5, characterized in that, The adjustable throttle valve includes a valve body and a valve core. An oil inlet and an oil outlet are respectively provided at both ends of the valve body, and a flow passage communicating the oil inlet and the oil outlet is provided in the valve body; The valve core is located at the side of the valve body, and the first end of the valve core is located in the flow passage. A driving member is provided at the second end of the valve core for driving the valve core to displace and change the cross-sectional area of the flow passage.

7. The oil mist amount control system of a rock drill according to claim 6, wherein, A first protrusion and a second protrusion are provided on the inner wall of the valve body, and a tapered damping hole is formed between the first protrusion and the second protrusion; The first end of the valve core is a tapered structure adapted to the damping hole, and the first end of the valve core is located in the damping hole.

8. The oil mist amount control system of a rock drill according to any one of claims 1 to 5, characterized in that, Multiple sets of the electromagnetic lubricating oil pump and the adjustable throttle valve are provided in a supporting manner for controlling the oil mist amount of multiple rock drills.

9. A control method for the oil mist amount of a rock drill, characterized in that, Adopting the rock drill oil mist amount control system according to any one of claims 1 to 8, the rock drill oil mist amount control method includes the following steps: Step 1, obtain the required lubricating oil amount per minute of the rock drill and set the pumping times per minute of the electromagnetic lubricating oil pump; Step 2, calculate the theoretical lubricating oil access amount of the rock drill during each pumping of the electromagnetic lubricating oil pump based on the required lubricating oil amount and the pumping times; Step 3, adjust the back pressure of the adjustable throttle valve; Step 4, obtain the real-time lubricating oil access amount of the rock drill and determine whether the difference between the real-time lubricating oil access amount and the theoretical lubricating oil access amount is less than a threshold value: If so, control the rock drill to perform an impact action; Otherwise, return to Step 3.

10. The method for controlling the oil mist amount of a rock drill according to claim 9, characterized in that, During the process of performing Step 3 and Step 4, the liquid level height in the lubricating oil pot is also monitored in real time, and when the liquid level height is lower than the height threshold, the rock drill is controlled to stop the impact action.

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