A lubricating oil monitoring device for the hoisting speed reducer of a mining excavator

Abstract

The present invention discloses a lubricating oil monitoring device for a hoisting speed reducer of a mining excavator, which comprises a cylindrical container, a diversion wall and an RFID strain sensor. The cylindrical container is installed at the bottom of the speed reducer housing, and its upper end is open and communicated with the inside of the speed reducer housing for collecting iron filings in the lubricating oil of the speed reducer. The cylindrical container comprises a housing and a silica gel film, a deformation plate, a magnet, a closed iron cover and a strain plate which are sequentially arranged in the housing from top to bottom. The deformation plate and the strain plate are connected by a connecting rod. The diversion wall is used for guiding the lubricating oil in the speed reducer to flow through the cylindrical container. The RFID strain sensor comprises an IC chip, a patch and an RFID reader. The IC chip is installed on the bottom surface of the strain plate through the patch. The RFID reader is used for reading the deformation result of the strain plate. The device has a simple structure and is convenient to use, effectively avoiding gear damage.

Description

Technical Field

[0001] The invention belongs to the technical field of mining excavators, and particularly relates to a lubricating oil monitoring device for a lifting speed reducer of a mining excavator. Background Art

[0002] A mining excavator is one of the large-scale devices for open-pit coal mine mining, mainly used for stripping gangue and mining coal in open-pit coal mines. The speed reducer is installed between the prime mover and the working machine, mainly playing the role of matching the rotational speed and transmitting torque, and is widely used in the machinery industry. The speed reducers in mining excavators are divided into rotary mechanism speed reducers, lifting mechanism speed reducers, pushing mechanism speed reducers, traveling mechanism speed reducers, etc. according to different uses. When selecting a speed reducer, the output torque of the speed reducer should match the input torque of the mechanism. During the use of the speed reducer, special attention should be paid to the inspection and replacement of the lubricating oil to ensure good lubrication of the speed reducer. The working conditions of mining excavators are harsh, and the cleanliness of the lubricating oil of the speed reducer is very important. Practice has proved that regular cleaning and oil change of the speed reducer play an important role in extending the service life of the speed reducer, and lubricating oil should be replenished regularly during the use process.

[0003] At present, RFID technology can realize passive wireless structural strain monitoring. Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology. RFID mainly consists of an electronic tag (Tag), an antenna (Antenna), a reader (Reader), and control software, and can quickly obtain the information in the tag in a non-contact and batch manner through the radio wave technology of the reader. For example, General Electric (GE) Renewable Energy is one of the few companies planning to pilot or deploy sensors supporting power-free RFID. For energy applications, the system consists of Asygn's sensor IC, which is embedded in a tag with built-in UHF RFID function and connected to the rotating components and axes of a hydrogenerator. The tag captures temperature and strain measurement values, and then forwards this data to the RFID reader to identify when the machine needs inspection or maintenance.

[0004] The lifting mechanism speed reducer of a mining excavator is a two-stage parallel shaft gear transmission, a double-input shaft parallel involute gear speed reducer, and is driven by two motors. It is a low-speed and high-torque transmission device, requiring a large output torque range, high working efficiency, and a strong structure. The structural gear transmission space is filled with lubricating oil; since the operation of the speed reducer requires lubricating oil for lubrication, over time, impurities such as iron filings of the machine will be mixed in the lubricating oil, mainly the iron filings generated by gear friction under large loads. Therefore, it will increase the wear of the gears inside the gearbox, causing damage and failure of the gearbox, which is the main reason for the failure of the speed reducer. In order to ensure the normal operation of the machine, it is necessary to clean and replace the lubricating oil, and how to determine the cleanliness and replacement of the lubricating oil is the main problem currently faced. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a lubricating oil monitoring device for a hoisting speed reducer of a mining excavator, which can clean and monitor iron filings in the lubricating oil of the speed reducer.

[0006] For this reason, the present invention adopts the following technical solutions:

[0007] A lubricating oil monitoring device for a hoisting speed reducer of a mining excavator includes a cylindrical container, a diversion wall and an RFID strain sensor.

[0008] The cylindrical container is installed at the bottom of the speed reducer housing, and its upper end is open and communicated with the inside of the speed reducer housing for collecting iron filings in the lubricating oil of the speed reducer. The cylindrical container includes a housing and a silica gel film, a deformation plate, a magnet, a closed iron cover and a strain plate which are sequentially arranged in the housing from top to bottom. The deformation plate and the strain plate are connected by a connecting rod. Among them:

[0009] The silica gel film is seamlessly connected to the inner wall of the housing for isolating the collected iron filings from the lower space of the cylindrical container.

[0010] The deformation plate is arranged under the silica gel film and is rectangular in shape. The two ends of the deformation plate are connected to the inner wall of the housing and can deform with the deformation of the silica gel film.

[0011] A space is reserved between the closed iron cover and the deformation plate, and the periphery of the closed iron cover is seamlessly connected to the inner wall of the housing.

[0012] The magnet is installed in the space between the closed iron cover and the deformation plate and keeps its relative position unchanged with the closed iron cover.

[0013] The connecting rod passes through the central holes of the magnet and the closed iron cover and can slide relatively with them.

[0014] A gap is formed between the strain plate and the closed iron cover. The strain plate is rectangular in shape, and its two ends are connected to the inner wall of the housing and can deform with the downward movement of the connecting rod.

[0015] The diversion wall is used to guide the lubricating oil in the speed reducer to flow through the cylindrical container.

[0016] The RFID strain sensor includes an IC chip, a patch and an RFID reader. The IC chip is installed on the bottom surface of the strain plate through the patch. The RFID reader is used to read the deformation result of the strain plate.

[0017] Preferably, the cylindrical container is located at the middle position below the gear of the speed reducer.

[0018] In one embodiment of the present invention, the flow guiding wall is composed of two symmetrically arranged arc-shaped plates. The convex surfaces of the two arc-shaped plates face each other. The outer side of each arc-shaped plate is connected to the inner wall of the reducer housing, and the inner projections of the two arc-shaped plates are tangent to the outer circle of the cylindrical container.

[0019] In another embodiment of the present invention, the flow guiding wall is composed of two symmetrically arranged arc-shaped plates. The concave surfaces of the two arc-shaped plates face each other. The outer side of each arc-shaped plate is connected to the inner wall of the reducer housing, and the inner projections of the two arc-shaped plates are in contact with the outer circle of the cylindrical container.

[0020] The deformation plate and the strain plate can be plastic plates or plastic sheets. Both ends of the deformation plate and the strain plate respectively form simply supported structures with the housing.

[0021] The outer side of the magnet can be fixed to the inner wall of the housing through polyurethane foam adhesive. The housing is threadedly connected to the bottom of the reducer housing.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] 1. In the present invention, the accumulative amount data of iron filings in the lubricating oil of the hoisting reducer of the mining excavator can be read at any time through the reader. Since the accumulative amount of iron filings is related to the cleanliness of the lubricating oil, the cleanliness of the lubricating oil can be determined through the accumulative amount of iron filings, so as to determine whether the lubricating oil needs to be replaced.

[0024] 2. In the present invention, the rotation of the gears of the reducer causes the flow of the lubricating oil. The flow guiding wall guides the fluid to pass through the cylindrical container, and the cylindrical container quickly collects the iron filings, thereby preventing the iron filings from entering the gear meshing process again and avoiding gear damage.

[0025] 3. The structure of the present invention is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the external structure of the hoisting reducer of the mining excavator related to the present invention;

[0027] Figure 2 is a schematic diagram of the bottom housing structure and the lubricating oil flow direction of the hoisting reducer of the mining excavator related to the present invention;

[0028] Figure 3 is a three-dimensional schematic diagram of the bottom housing structure of the hoisting reducer of the mining excavator of the present invention;

[0029] Figure 4 is a top view structural schematic diagram showing the positional relationship between the flow guiding wall and the cylindrical container in the present invention;

[0030] Figure 5 is a sectional structural schematic diagram of the cylindrical container in the present invention;

[0031] Figure 6 In the present invention, after the iron filings have accumulated for a period of time, this is a schematic cross-sectional structure diagram of the cylindrical container.

[0032] In the figure:

[0033] 1. Strain plate 2. Connecting rod 3. Magnet

[0034] 4. Silicone membrane 5. IC chip / patch 6. Deformation plate

[0035] 7. Sealed iron cover 8. Housing 9. Flow guide wall

[0036] 10. Bottom housing of the speed reducer 11. Iron filings Specific embodiments

[0037] The structure of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] As Figure 1-6 shown, the lubricating oil monitoring device for the mining excavator hoisting speed reducer of the present invention includes a cylindrical container 8, a flow guide wall 9, and an RFID strain sensor. The cylindrical container is installed at the bottom of the speed reducer housing, and its upper end is open and communicates with the inside of the speed reducer housing for collecting iron filings in the lubricating oil of the speed reducer. The cylindrical container includes a housing 8 and a silicone membrane 4, a deformation plate 6, a magnet 3, a sealed iron cover 7, and a strain plate 1 that are sequentially arranged in the housing 8 from top to bottom. The deformation plate 6 and the strain plate 1 are connected by a connecting rod 2. Among them:

[0039] The silicone membrane 4 is seamlessly connected to the inner wall of the housing 8 for isolating the collected iron filings from the lower space of the cylindrical container; the deformation plate 6 is arranged below the silicone membrane 4 and has a rectangular shape. The two ends of the deformation plate 6 are connected to the inner wall of the housing 8 and can deform with the deformation of the silicone membrane 4; a space is reserved between the sealed iron cover 7 and the deformation plate 6, and the periphery of the sealed iron cover 7 is seamlessly connected to the inner wall of the housing 8; the magnet 3 is installed in the space between the sealed iron cover 7 and the deformation plate 6 and keeps a fixed relative position with the sealed iron cover 7; the connecting rod 2 passes through the central holes of the magnet 3 and the sealed iron cover 7 and can slide relative to them; a gap is formed between the strain plate 1 and the sealed iron cover 7; the strain plate 1 has a rectangular shape, and its two ends are connected to the inner wall of the housing 8 and can deform with the downward movement of the connecting rod 2. Refer to Figure 4 , the cylindrical container is preferably arranged at the middle position below the speed reducer gear.

[0040] The flow guide wall 9 is used to guide the lubricating oil in the speed reducer to flow through the cylindrical container. As Figure 3 and Figure 4As shown, in an embodiment of the present invention, the flow guiding wall 9 is two arc-shaped plates symmetrically arranged, with the convex surfaces of the two arc-shaped plates facing each other. The outer side of each flow guiding wall is connected to the inner wall of the reducer housing, and the inner projections of the two flow guiding walls are tangent to the outer circle of the cylindrical container. In another embodiment of the present invention, the flow guiding wall 9 is two arc-shaped plates symmetrically arranged, with the concave surfaces of the two arc-shaped plates facing each other. The outer side of each arc-shaped plate is connected to the inner wall of the reducer housing, and the inner projections of the two arc-shaped plates are in contact with the outer circle of the cylindrical container.

[0041] The RFID strain sensor includes an IC chip, a patch 5, and an RFID reader. The IC chip is mounted on the bottom surface of the strain plate 1 through the patch; the RFID reader is used to read the deformation result of the strain plate 1.

[0042] The deformation plate 6 and the strain plate 1 can be plastic plates or plastic sheets; both ends of the deformation plate 6 and the strain plate 1 can respectively form simply supported structures at both ends with the housing 8.

[0043] The outer side of the magnet 3 can be fixed to the inner wall of the housing 8 through polyurethane foam. The housing 8 can be threadedly connected to the bottom of the reducer housing for easy disassembly.

[0044] The working principle of this device is as follows:

[0045] The gears of the reducer rotate, causing the lubricating oil in the reducer to flow. The lubricating oil is guided by the flow guiding wall 9 to flow through the cylindrical container. Under the action of the magnet, the iron filings 11 in the lubricating oil directly fall onto the silica gel film 4 in the cylindrical container. Due to the adsorption effect of the magnet 3 on the iron filings 11, the silica gel film 4 and the deformation plate 6 deform, driving the connecting rod 2 to move downward, and then causing the strain plate 1 to deform. After a period of time, a certain amount of iron filings 11 fall on the silica gel film 4. The deformation result of the strain plate 1 is read by an RFID reader (not shown in the figure), and then the accumulation degree of the iron filings 11 is obtained. This accumulation degree has a corresponding relationship with the cleanliness of the lubricating oil, so that the replacement time of the lubricating oil can be determined. When replacement is needed, as long as the cylindrical container is screwed out, the unclean lubricating oil can be drained.

Claims

1. A lubricating oil monitoring device for the hoisting speed reducer of a mining excavator, characterized in that: It includes a cylindrical container (8), a flow guiding wall (9) and an RFID strain sensor. The cylindrical container is installed at the bottom of the reducer housing. Its upper end is open and communicates with the inside of the reducer housing, and is used to collect iron filings in the reducer lubricating oil. The cylindrical container includes a housing (8) and a silica gel membrane (4), a deformation plate (6), a magnet (3), a closed iron cover (7) and a strain plate (1) which are sequentially arranged in the housing (8) from top to bottom. The deformation plate (6) and the strain plate (1) are connected by a connecting rod (2). Among them: The silica gel membrane (4) is seamlessly connected to the inner wall of the housing (8) and is used to isolate the collected iron filings from the lower space of the cylindrical container. The deformation plate (6) is arranged below the silica gel membrane (4) and is rectangular in shape. The two ends of the deformation plate (6) are connected to the inner wall of the housing (8) and can deform with the deformation of the silica gel membrane (4). A space is reserved between the closed iron cover (7) and the deformation plate (6), and the periphery of the closed iron cover (7) is seamlessly connected to the inner wall of the housing (8). The magnet (3) is installed in the space between the closed iron cover (7) and the deformation plate (6) and keeps a fixed relative position with the closed iron cover (7). The connecting rod (2) passes through the central holes of the magnet (3) and the closed iron cover (7) and can slide relative to them. A gap is formed between the strain plate (1) and the closed iron cover (7). The strain plate (1) is rectangular in shape. The two ends of the strain plate (1) are connected to the inner wall of the housing (8) and can deform with the downward movement of the connecting rod (2). The flow guiding wall (9) is composed of two symmetrically arranged arc-shaped plates and is used to guide the lubricating oil in the reducer to flow through the cylindrical container. The RFID strain sensor includes an IC chip, a patch (5) and an RFID reader. The IC chip is installed on the bottom surface of the strain plate (1) through the patch. The RFID reader is used to read the deformation result of the strain plate (1).

2. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to claim 1, characterized in that: The cylindrical container is located at the middle position below the gear of the reducer.

3. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to claim 2, wherein: The convex surfaces of the two arc-shaped plates face each other. The outer side of each arc-shaped plate is connected to the inner wall of the reducer housing, and the inner side projections of the two arc-shaped plates are tangent to the outer circle of the cylindrical container.

4. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to claim 2, wherein: The concave surfaces of the two arc-shaped plates face each other. The outer side of each arc-shaped plate is connected to the inner wall of the reducer housing, and the inner side projections of the two arc-shaped plates are in contact with the outer circle of the cylindrical container.

5. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to claim 4, characterized in that: The deformation plate (6) and the strain plate (1) are plastic plates or plastic sheets.

6. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to claim 5, wherein: The two ends of the deformation plate (6) and the strain plate (1) respectively form two-end simply supported structures with the housing (8).

7. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to any one of claims 1-6, characterized in that: The outer side of the magnet (3) is fixed to the inner wall of the housing (8) by polyurethane foam glue.

8. The lubricating oil monitoring device for the hoisting speed reducer of the mining excavator according to claim 7, wherein: The housing (8) is threadedly connected to the bottom of the reducer housing.

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