An oil shortage alarm device for the lubrication system of the central control bearing of a ball mill

Abstract

This utility model relates to an oil shortage alarm device for the lubrication system of the central control bearing of a ball mill, belonging to the field of ball mill safety protection technology. The device innovatively adopts a mechanical guide plate structure, with a rotating shaft positioned downstream of the oil outlet. The angle of the guide plate is changed by the impact force of the oil flow. By detecting changes in the distance between the guide plate above the shaft and a high-protection-level proximity switch, the oil flow status is directly and sensitively sensed. Combined with the adjustable delay logic built into the controller, it can effectively distinguish between temporary fluctuations and real faults, triggering audible and visual alarms for tiered alarms. This solution is simple and reliable in structure, has strong anti-pollution capabilities, and is low in cost. It realizes a technological shift from indirect oil pressure monitoring to direct oil flow monitoring, solving problems such as easy clogging of traditional flow meters and delayed oil pressure response, providing effective early oil shortage warning protection for ball mill bearings.

Description

Technical Field

[0001] This utility model belongs to the field of ball mill safety protection technology, specifically relating to an oil shortage alarm device for the lubrication system of the central control bearing of a ball mill. Background Technology

[0002] Continuous and reliable lubrication of the central control bearings in ball mills is crucial for ensuring the long-term stable operation of the equipment. Currently, the industry mainly relies on the following methods to monitor lubrication status: First, using oil pressure gauges to monitor the oil pressure of the lubrication system, such as the device disclosed in Chinese Patent Publication No. CN1788849A, which indirectly judges the lubrication status by monitoring oil pressure; second, using manual periodic inspections, judging by observation and experience; and third, using flow meters to directly monitor the lubricating oil flow, such as the oil cut-off protection device for the lubrication system of heavy-duty machinery disclosed in Chinese Patent Publication No. CN112076848B.

[0003] However, these existing technologies all have obvious drawbacks:

[0004] Oil pressure changes lag behind actual flow interruptions, making early warning impossible. When the oil pump malfunctions or the oil circuit is slightly blocked, the oil pressure change may not be obvious, but the actual flow rate may already be insufficient. By the time the oil pressure gauge shows an abnormal reading, the bearing may already be in a state of oil shortage.

[0005] Manual inspections have blind spots in terms of time, cannot respond promptly to sudden fuel shortages, rely on personnel's sense of responsibility, and have poor reliability.

[0006] While using flow meters such as rotor flow meters can directly monitor flow, the cost is high, and their internal structure is easily clogged by oil and impurities in harsh industrial and mining environments, leading to failure and a large amount of maintenance work.

[0007] Other oil film detection technologies often require modification of the bearing body, which is complex, difficult to implement, and costly. Utility Model Content

[0008] The purpose of this invention is to solve the above-mentioned technical problems and provide an oil shortage alarm device for the lubrication system of the central control bearing of a ball mill that is simple in structure, low in cost, strong in anti-pollution ability, and capable of early warning and graded alarm.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0010] An oil shortage alarm device for the lubrication system of the central control bearing of a ball mill includes an alarm device, a guide plate, a proximity switch, and a controller. The upper part of the guide plate is rotatably disposed downstream of the outlet of the lubricating oil channel via a rotating shaft. The proximity switch is fixed on the right side of the guide plate, facing away from the lubricating oil flow and located above the rotating shaft. The distance L between the guide plate above the rotating shaft and the proximity switch is 0.5-3mm. The output terminal of the proximity switch is electrically connected to the signal input terminal of the controller, and the signal output terminal of the controller is electrically connected to the alarm device.

[0011] Furthermore, the proximity switch is an inductive normally open sensor with a protection rating of not less than IP67 and a sensing distance of 1.5mm from the guide plate.

[0012] Furthermore, the controller has a built-in adjustable delay module, with the trigger delay time set to 3–10 seconds.

[0013] Furthermore, the controller is configured to control the alarm device to issue an alarm signal after the proximity switch's triggered state continues for more than a set delay time.

[0014] Furthermore, the alarm device employs an audible and visual alarm, capable of emitting different forms of audible and visual signals to distinguish different levels of fault conditions.

[0015] Furthermore, when insufficient oil pressure is detected, the alarm device emits a flashing yellow light and a voice prompt; when a complete oil cut-off is detected, the alarm device emits a flashing red light and a buzzer.

[0016] Furthermore, it also includes a mounting bracket for fixing the rotating shaft and proximity switch, and has a three-dimensional spatial position adjustment function.

[0017] Furthermore, the guide plate is made of 304 stainless steel plate with a thickness of 1-3mm.

[0018] Furthermore, the rotating shaft is located in the upper two-fifths of the area in the height direction of the guide plate.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This utility model directly senses the impact force of the lubricating oil flow through the guide plate, and can respond to changes in the oil flow in real time. Compared with the indirect method of monitoring oil pressure, this utility model can trigger an early warning in the initial stage of oil flow reduction, which greatly shortens the fault response time and avoids the problem of early warning delay caused by the lag in oil pressure changes, providing an earlier early warning window for equipment protection.

[0021] 2. The entire detection mechanism of this utility model is mainly composed of a mechanical guide plate and a non-contact proximity switch. It has a simple structure and is not prone to failure. In particular, the use of an inductive proximity switch with a high protection level of IP67 can effectively resist oil, water vapor and dust in the lubricating oil environment, solve the problem of easy clogging and damage of traditional flow meters, significantly improve the reliability and service life of the system, and reduce the maintenance frequency and cost.

[0022] 3. The controller of this utility model has a built-in adjustable delay trigger logic, which can effectively distinguish between short-term oil flow fluctuations (such as equipment start-up and shutdown, oil pump switching) and real oil cut-off or insufficient oil pressure faults. The alarm is only triggered when the abnormal state lasts for more than the preset time, which effectively avoids false alarms under normal equipment operating conditions and improves the accuracy and reliability of the alarm system.

[0023] 4. This utility model can distinguish between two levels of fault states, namely "insufficient oil pressure" and "complete oil cut-off", based on the different degrees of deflection of the guide plate. It also provides different forms of alarms, such as yellow warning and red emergency alarm, through audible and visual alarms, to remind operators to take appropriate measures. This achieves hierarchical management of early warning and further ensures equipment safety.

[0024] 5. This utility model can distinguish between two levels of fault states, namely "insufficient oil pressure" and "complete oil cut-off," based on the different degrees of deflection of the guide plate. It also provides different forms of alarms, such as yellow warning and red emergency alarm, through audible and visual alarms, to remind operators to take appropriate measures. This achieves hierarchical management of early warning and further ensures equipment safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention during normal operation;

[0026] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the present invention when the lubricating oil pressure is insufficient;

[0028] Figure 4 This is a schematic diagram of the structure of the present invention when the lubricating oil is cut off;

[0029] In the diagram: 1-Central control shaft; 2-Ball mill; 3-Oil passage; 4-Alarm device; 5-Guide plate; 6-Rotating shaft; 7-Lubricating oil; 8-Proximity switch. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0031] An oil shortage alarm device for the lubrication system of a ball mill central control bearing includes an alarm device 4, a guide plate 5, a proximity switch 8, a controller, and a mounting bracket. The guide plate 5 is made of 2mm thick 304 stainless steel plate, and its upper part is rotatably mounted downstream of the outlet of the lubricating oil channel 3 via a rotating shaft 6. The mounting position of the rotating shaft 6 is located at approximately 2 / 5 of the height of the guide plate 5 to form a good lever structure. The proximity switch 8 is an inductive normally open sensor (IP67 protection rating) with a sensing distance of 1.5mm. It is fixedly mounted on the side of the guide plate 5 opposite to the lubricating oil flow via the mounting bracket and directly opposite the right side of the guide plate 5 above the rotating shaft 6. During installation, the three-dimensional adjustable mounting bracket is used for fine adjustment to ensure that the guide plate 5 is vertical when there is no oil flow. The distance L between the guide plate 5 above the rotating shaft 6 and the sensing surface of the proximity switch 8 is 0.5mm.

[0032] The signal output line of the proximity switch 8 is connected to the digital input port of the controller. The controller is a small PLC with a built-in adjustable delay function, and its delay time is set to 8 seconds (which can be adjusted within the range of 3-10 seconds). The output port of the controller is connected to the alarm device 4. In this embodiment, the alarm device 4 is an audible and visual alarm with voice and multiple sound and light indication functions.

[0033] The controller's adjustable delay module trigger delay time can be set to any value between 3 and 10 seconds.

[0034] When the guide plate 5 is vertical, the distance L between it and the sensing surface of the proximity switch 8 can be any value less than 0.8 mm.

[0035] The working process of this utility model:

[0036] like Figure 1 , Figure 2 During normal oil supply, lubricating oil 7 is pumped in by the oil pump and flows to the right along the oil passage 3 at a certain flow rate. When it leaves the oil passage outlet, the lubricating oil impacts the lower part of the guide plate 5 in a parabolic trajectory, causing the guide plate 5 below the rotating shaft 6 to tilt to the right and the guide plate 5 above the rotating shaft 6 to tilt to the left. At this time, the distance between the guide plate 5 above the rotating shaft 6 and the proximity switch 8 increases to 2.3mm, which is greater than the sensing distance of the proximity switch 8 by 1.5mm. The proximity switch 8 remains open, and the controller does not trigger an alarm.

[0037] like Figure 3As shown, when the oil pump efficiency decreases or the oil circuit is slightly blocked, the flow rate and impact force of the lubricating oil 7 pumped in by the oil pump decrease, resulting in insufficient impact force of the lubricating oil on the guide plate 5 below the rotating shaft 6. The guide plate 5 above the rotating shaft 6 deflects slightly to the left, and the distance between the guide plate 5 above the rotating shaft 6 and the proximity switch 8 decreases to about 1.2mm, which is less than the sensing distance of the proximity switch 8 of 1.5mm. The proximity switch 8 is triggered (closed), and the controller starts timing. When this state lasts for more than 8 seconds, the controller determines that "oil pressure is insufficient" and controls the sound and light alarm to broadcast the voice "oil pressure is insufficient, please adjust in time" while the yellow light flashes.

[0038] like Figure 4 As shown, when the oil pump stops or the oil circuit is completely interrupted, no oil flow impacts the guide plate 5. Under its own gravity, the guide plate 5 naturally returns to a vertical state. The distance between the guide plate 5 above the shaft 6 and the proximity switch 8 decreases to 0.5mm, which is less than the alarm threshold of 0.8mm. After 8 seconds of timing, the controller determines that the oil supply is completely cut off and controls the audible and visual alarm to broadcast the voice "Oil supply cut off, please supply oil in time". At the same time, the red light flashes rapidly and a sharp buzzing sound is heard.

Claims

1. An oil shortage alarm device for the lubrication system of the central control bearing of a ball mill, characterized in that: The device includes an alarm device (4), a guide plate (5), a proximity switch (8), and a controller. The upper part of the guide plate (5) is rotatably disposed downstream of the outlet of the lubricating oil passage (3) via a rotating shaft (6). The proximity switch (8) is fixed on the side of the guide plate (5) facing away from the lubricating oil flow and located on the right side of the guide plate (5) above the rotating shaft (6). The distance L between the guide plate (5) above the rotating shaft (6) and the proximity switch (8) is 0.5-3mm. The output end of the proximity switch (8) is electrically connected to the signal input end of the controller, and the signal output end of the controller is electrically connected to the alarm device (4).

2. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 1, characterized in that, The proximity switch (8) is an inductive normally open sensor with a protection level of not less than IP67 and a sensing distance of 1.5mm from the guide plate (5).

3. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 1, characterized in that, The controller has a built-in adjustable delay module, and the trigger delay time is set to 3–10 seconds.

4. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 3, characterized in that: The controller is configured to control the alarm device (4) to issue an alarm signal after the proximity switch (8) has been in a triggered state for more than a set delay time.

5. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 1, characterized in that, The alarm device (4) uses an audible and visual alarm, which can emit different forms of audible and visual signals to distinguish different levels of fault conditions.

6. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 5, characterized in that, When insufficient oil pressure is detected, the alarm device (4) emits a yellow flashing light and a voice prompt; when a complete oil cut-off is detected, the alarm device (4) emits a red flashing light and a buzzer.

7. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 1, characterized in that: It also includes a mounting bracket for fixing the rotating shaft (6) and the proximity switch (8), and the mounting bracket has a three-dimensional spatial position adjustment function.

8. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 1, characterized in that: The guide plate (5) is made of 304 stainless steel plate with a thickness of 1-3mm.

9. The oil shortage alarm device for the central control bearing lubrication system of a ball mill according to claim 1, characterized in that: The rotating shaft (6) is located in the upper two-fifths of the height region of the guide plate (5).

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