Abrasive grain early warning device and mounting structure thereof

Abstract

The present application relates to a kind of abrasive particle early warning device and its installation structure, the abrasive particle early warning device includes coaxially arranged shell, inner shell and pedestal, the connecting end of a abrasive particle early warning sensor is installed in the core of pedestal, main body overhangs in the rear of pedestal, inner hole of inner shell, shell and inner shell are equipped with shell oil groove and inner shell oil groove respectively through inside and outside;Rotating pedestal will drive inner shell to rotate, make abrasive particle early warning device switch between working condition and maintenance condition, in working condition, shell oil groove and inner shell oil groove are communicated, in maintenance condition, shell oil groove and inner shell oil groove are not communicated with each other;The abrasive particle early warning device installation structure includes bearing seat and abrasive particle early warning device, multiple cavities are arranged in bearing seat, abrasive particle early warning device is installed on bearing seat and its most overhangs in corresponding cavity.The present application can absorb and remove abrasive particle in planetary mechanism oil pool and output early warning information, can improve the cleaning degree of oil pool and the quality of oil, ensure the normal work of oil film.

Description

Technical Field

[0001] This invention relates to an abrasive early warning device and its installation structure, which is mainly used in the final stage planetary mechanism of the rocker arm of a coal mining machine and belongs to the field of coal mining machine technology. Background Technology

[0002] The final stage planetary mechanism of the rocker arm in a coal mining machine, as the direct drive device of the drum actuator, is located in the transmission position where it experiences the greatest stress, bears the first load impact, and operates under the most severe conditions. With the continuous increase in the power density of planetary mechanisms, the strength of transmission components is designed to be higher to improve load-bearing capacity, resulting in a smaller cavity volume and weaker heat storage capacity of the planetary mechanism's oil sump. This leads to a gradual increase in secondary problems caused by overheating. As an independent cavity, the final stage planetary mechanism of the rocker arm in a coal mining machine is generally kept sealed from installation to major overhaul and disassembly. The gradually increasing abrasive particles inside cannot be discharged from the cavity. Simultaneously, under impact and vibration conditions, the wear and pressure drop of the floating seal's sealing surface can allow dust particles to enter the cavity and contaminate the oil. Prolonged use will affect the contact surfaces of the transmission system. Furthermore, many existing planetary mechanisms lack drainage channels, resulting in the inability to completely drain the oil. Even during oil changes and maintenance, abrasive particles and other residues at the bottom cannot be completely removed.

[0003] To address the aforementioned issues related to force, heat, oil quantity, abrasive particles, impurities, as well as the challenges of compact structure and difficult maintenance, the industry typically employs frequent oil changes and improves the quality of floating seals and bearings using carburizing and quenching processes to reduce the impact of these factors on the transmission system. Transmission systems, especially the final-stage planetary mechanism, become delicate in actual use. Extending their service life requires considerable maintenance effort; inadequate maintenance can easily lead to problems, causing significant losses and production stoppages that impact mining. Furthermore, the relatively frequent oil changes increase maintenance time and costs. Summary of the Invention

[0004] The present invention aims to provide an abrasive early warning device and its installation structure, which can adsorb and remove abrasive particles in the oil pool of a planetary mechanism, improve the cleanliness of the oil pool and the quality of the oil, and ensure the normal operation of the oil film.

[0005] The main technical solutions of this invention are as follows:

[0006] Abrasive particle warning device includes a coaxially arranged outer shell, inner shell, and base. The outer shell is a barrel-shaped structure with an open front end and a closed rear end, and the front end of the outer shell is configured as a flange. The base is a hollow stepped shaft structure with a thicker front and a thinner rear end, forming a stepped surface between the thicker and thinner shaft sections. The front part of the base is embedded in the front inner hole of the outer shell, and a seal is provided between the cylindrical surfaces of the outer shell and the base where they fit together. The inner shell is a cylindrical structure, and the inner shell and the outer shell form a shaft hole fit. The upper axial limit of the inner shell is located between the rear end of the outer shell and the stepped surface of the base. The connection end of an abrasive particle warning sensor is installed in the core of the base, and the sensing part of the abrasive particle warning sensor extends out from the rear of the base and into the inner hole of the inner shell. The outer shell and the inner shell are respectively provided with inner... The device comprises an outer shell oil groove and an inner shell oil groove that are interconnected. A circumferential limiting structure is provided between the inner shell and the base. By rotating the base, the inner shell can be rotated relative to the outer shell, allowing the abrasive warning device to switch between working and maintenance states. In the working state, the outer shell oil groove and the inner shell oil groove are connected. In the maintenance state, the outer shell oil groove and the inner shell oil groove are not connected. The inner shell has a circumferentially extending arc-shaped groove with the opening facing outwards. The outer shell has a radially penetrating threaded hole, and the position of the threaded hole in the axial direction is aligned with the arc-shaped groove. A positioning screw is installed in the threaded hole of the outer shell, and the inner end of the positioning screw is inserted into the arc-shaped groove. In the working state and the maintenance state, the inner end of the positioning screw rests against the two ends of the arc-shaped groove, respectively.

[0007] The front end of the inner shell is provided with an axially protruding boss, and the front shaft section of the base is provided with a radially extending groove with the opening facing backward. The boss is embedded in the groove to form the circumferential limiting structure.

[0008] Both the outer shell oil groove and the inner shell oil groove are preferably multiple axially extending elongated holes arranged circumferentially at intervals. In the working state, the outer shell oil groove and the inner shell oil groove correspond one-to-one, and in the maintenance state, the outer shell oil groove and the inner shell oil groove are staggered.

[0009] The base and the outer shell are respectively provided with a base wire passage groove and an outer shell wire passage groove. The wiring of the abrasive early warning sensor passes through the core of the base and then runs through the base wire passage groove and the outer shell wire passage groove in sequence.

[0010] The front section of the core inner hole of the base is preferably a polygonal inner hole, and adjacent to the polygonal inner hole is a front threaded hole.

[0011] The abrasive warning device preferably includes a locking mechanism, which may include a radially extending lock hole disposed in the base and a locking end hole disposed on the front hole wall of the housing. The inner end of the lock hole communicates with the polygonal inner hole. The lock hole consists of a threaded hole section, a spring mounting hole section and a ball socket section from the inside to the outside. In the installed state, a screw plug, a spring and a steel ball are installed in each section of the lock hole from the inside to the outside. In the working state, the lock hole and the locking end hole are directly opposite each other, and the steel ball abuts against the inner surface of the locking end hole.

[0012] An abrasive warning device mounting structure includes a bearing housing for a planetary mechanism of a coal mining machine rocker arm and the abrasive warning device. The bearing housing is a disc-type part, comprising a bearing housing body with a bearing hole extending horizontally along its axis. A retaining edge is provided at the rear end of the bearing hole. A circular groove is provided in the middle of the rear end of the bearing housing body. The bearing housing body contains multiple cavities spaced apart in a circumferential direction, with the cavities opening at the bottom of the groove and on the groove wall near the bottom. The rear end face of the retaining edge is located on the bottom of the groove. The front and rear ends of the bearing housing body are respectively provided with a front outer stop and a rear outer stop. An abrasive warning device mounting hole is provided on the mating end face of the front outer stop. The abrasive warning device mounting hole communicates with one of the cavities. The abrasive warning device is fixed to the bearing housing body by a flange structure, with most of the abrasive warning device suspended within the corresponding cavity.

[0013] The bearing housing body has multiple oblique holes and multiple radial through holes distributed radially in a central radial pattern. One end of each oblique hole is opened on the front end face of the bearing housing body and is close to the inner edge of the front end face. The other end of each oblique hole communicates with one of the cavities. Each radial through hole extends radially and penetrates one of the cavities.

[0014] Preferably, a radially penetrating oil drain hole is provided in the outer cavity wall of one of the cavities of the bearing housing body. The abrasive warning device mounting hole and the oil drain hole are connected to the same cavity, and the cavity is located at the lowest point in the circumferential direction relative to other cavities.

[0015] The front outer stop is also provided with a housing groove and a housing hole on the joint end face. The wiring of the abrasive early warning sensor is led out from the housing through the wire groove and then run through the housing groove and housing hole.

[0016] The beneficial effects of this invention are:

[0017] Because the inner shell of the abrasive warning device can rotate at a certain angle relative to the outer shell, it can achieve the connection and closure of the inner and outer spaces of the abrasive warning device. When connected, the abrasive warning device adsorbs abrasive particles in the oil and issues an alarm when the number of adsorbed abrasive particles reaches a certain level, thereby achieving the purpose of cleaning the oil. When closed, the abrasive warning device does not function. Therefore, disassembling and cleaning the abrasive warning device does not affect the oil.

[0018] By incorporating arc-shaped grooves and positioning screws, the accuracy of the inner shell's rotation position is ensured when the abrasive warning device switches between working and maintenance states.

[0019] By employing a locking mechanism to lock the relative position of the outer casing and the base after the abrasive warning device switches to the working state, the reliability of the abrasive warning device is ensured.

[0020] By setting the mounting groove and front threaded hole, it is convenient to use tools to rotate the base and apply axial force during the installation and removal of the base.

[0021] Because the cavity-type bearing housing has multiple cavities, it can store a large amount of oil in the planetary mechanism it is located in, thus greatly improving the heat storage capacity of the high-power planetary mechanism and ensuring the normal operation of the oil film. Furthermore, the cavity design significantly reduces the weight of the cavity-type bearing housing. When used in the final stage planetary mechanism of a coal mining machine rocker arm, the weight of the overhanging portion of the rocker arm can be appropriately reduced, improving the stability of the rocker arm.

[0022] The oblique holes and radial through holes can connect the semi-enclosed space inside the planetary mechanism with the inner cavity of the chamber, which is conducive to transferring the heat of the contact surface to the oil pool of the planetary mechanism through the oil, and finally dissipating or carrying away the heat through the outer wall of the planetary mechanism or the cooling mechanism.

[0023] The oil drain hole ensures that impurities at the bottom of the planetary mechanism's oil sump can be completely drained and removed.

[0024] Because the cavity bearing housing is equipped with mounting holes for abrasive warning devices, abrasive warning devices can be installed. These devices can not only adsorb abrasive particles in the planetary mechanism oil sump, but also issue an alarm when the number of adsorbed abrasive particles reaches a certain level. Therefore, they play a positive role in improving the cleanliness of the planetary mechanism oil sump and the quality of the oil, and ensuring the normal operation of the oil film.

[0025] By setting housing grooves, housing holes, base wire passage grooves, and outer casing wire passage grooves, the wiring of the abrasive particle early warning sensor is made convenient and protected. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of one embodiment of the abrasive particle early warning device;

[0027] Figure 2 for Figure 1 AA section view;

[0028] Figure 3 This is a half-sectional view of the outer casing;

[0029] Figure 4 for Figure 2 Partial sectional view of BB;

[0030] Figure 5 for Figure 2 CC partial sectional view;

[0031] Figure 6 This is a schematic diagram of the keyhole structure;

[0032] Figure 7 This is a schematic diagram showing the relative positional relationship between the outer shell and the inner shell during operation.

[0033] Figure 8 This is a schematic diagram showing the relative positions of the outer and inner shells under maintenance conditions.

[0034] Figure 9 A schematic diagram of one embodiment of the mounting structure for the abrasive particle warning device;

[0035] Figure 10 An enlarged view of one embodiment of the mounting structure for the abrasive particle warning device;

[0036] Figure 11 This is a schematic diagram of the structure of one embodiment of the bearing housing of the planetary mechanism of the rocker arm of the coal mining machine.

[0037] Figure label:

[0038] 01. Shell groove; 02. Shell hole;

[0039] 41. Cavity bearing housing; 4101. Oil drain hole; 411. Cavity; 413. Angled hole; 414. Radial through hole; 416. Abrasive grain warning device mounting hole; 417. Rear outer stop; 418. Bearing hole; 419. Front outer stop;

[0040] 49. Abrasive particle warning device; 491. Housing; 4911. Housing oil groove; 4912. Housing inner bore surface; 4913. Threaded hole; 4914. Locking end hole; 4915. Housing wire passage groove; 492. Positioning screw; 493. Inner shell; 4931. Inner shell oil groove; 4932. Inner shell outer shaft surface; 4933. Arc groove; 4934. Boss; 494. Base; 4940. Slot; 4941. Ball socket section; 4942. Spring mounting hole section; 4943. Threaded hole section; 4944. Mounting groove; 4945. Front threaded hole; 4946. Base wire passage groove; 495. Abrasive particle warning sensor; 498. Seal; 499. Locking mechanism; 4991. Steel ball; 4992. Spring; 4993. Plug. Detailed Implementation

[0041] This invention discloses an abrasive particle early warning device 49, see [link to relevant documentation]. Figure 1-11The system includes a coaxially arranged outer shell 491, inner shell 493, and base 494. The outer shell is a barrel-shaped structure with an open front and closed rear, and the front end of the outer shell is designed as a flange. The base adopts a hollow stepped shaft structure with a thicker front and a thinner rear, forming a stepped surface between the thicker and thinner shaft sections. The front part of the base is embedded in the front inner hole of the outer shell, and a seal 498 is provided between the cylindrical surfaces of the outer shell and the base that fit together. The inner shell is a cylindrical structure, and the inner shell forms a shaft hole fit with the outer shell. The upper limit of the inner shell in the axial direction is located between the rear end of the outer shell and the stepped surface of the base. A wear particle warning sensor 495 is installed at the core of the base. The connection includes a threaded connection and a shaft hole fit and seal. The main body of the wear particle warning sensor, which is also the sensing part, is suspended behind the base and in the inner hole of the inner shell. The wear particle warning sensor uses magnetic material to adsorb wear particles in the oil and issues a warning message when the number of adsorbed wear particles reaches a certain level, reminding the staff to remove the wear particles in the oil in time. The outer shell and inner shell are respectively provided with an outer shell oil groove 4911 and an inner shell oil groove 4931 that are interconnected. A circumferential limiting structure is provided between the inner shell and the base. Using this circumferential limiting structure, rotating the base can drive the inner shell to rotate relative to the outer shell, allowing the abrasive particle warning device to switch between working and maintenance states. In the working state, the outer shell oil groove and the inner shell oil groove are connected, meaning the inner and outer spaces of the abrasive particle warning device are connected. Adsorbing abrasive particles in the internal space of the abrasive particle warning device is equivalent to adsorbing abrasive particles in the external space, i.e., the space where the abrasive particle warning device is located, thereby achieving the purpose of cleaning the oil. In the maintenance state, the outer shell oil groove and the inner shell oil groove are not connected; that is, the inner hole surface 4912 of the outer shell closes the inner shell oil groove, and the outer shaft surface 4932 of the inner shell closes the outer shell oil groove, thereby achieving the purpose of sealing the oil. In this state, the abrasive particle warning device is inactive, so disassembling and cleaning the abrasive particle warning device does not affect the oil. The abrasive particle warning device can improve the cleanliness of the oil sump and the quality of the oil, ensuring the normal operation of the oil film.

[0042] The inner shell has a circumferentially extending arc-shaped groove 4933 with its opening facing outwards. The outer shell has a radially penetrating threaded hole 4913, which is axially aligned with the arc-shaped groove. A positioning screw 492 is installed in the threaded hole of the outer shell, with its inner end inserted into the arc-shaped groove. In the working and maintenance states, the inner ends of the positioning screw rest against the two ends of the arc-shaped groove, respectively. The arc-shaped groove and positioning screw ensure the accuracy of the inner shell's position when switching between working and maintenance states.

[0043] In the embodiment shown in the attached figure, the front end of the inner shell is provided with an axially protruding boss 4934, and the front shaft section of the base is provided with a radially extending, rearward-facing slot 4940. The boss is embedded in the slot to form the circumferential limiting structure. The flange structure of the outer shell has a rectangular disc surface, and bolt connection holes are provided at the four corners of the disc surface.

[0044] Both the outer and inner shell oil grooves are preferably multiple axially extending elongated holes arranged at intervals in the circumferential direction. In this embodiment, there are six outer shell oil grooves and six inner shell oil grooves, and their length and width are equal. In the working state, the outer shell oil grooves and the inner shell oil grooves correspond one-to-one; in the maintenance state, the outer shell oil grooves and the inner shell oil grooves are staggered.

[0045] The base and the outer shell are respectively provided with a base wiring groove 4946 and an outer shell wiring groove 4915 on their front end faces. The wiring of the abrasive particle warning sensor passes forward from the core of the base and then runs through the base wiring groove and the outer shell wiring groove in sequence. When the abrasive particle warning device switches between working state and maintenance state, the joint between the base wiring groove and the outer shell wiring groove always maintains a certain length of overlap.

[0046] The front section of the core inner hole of the base is a polygonal inner hole, which can be referred to as the mounting groove 4944. The mounting groove is usually hexagonal, which facilitates the insertion of tools such as Allen wrenches to rotate the base and thus change the position of the inner shell. Adjacent to this polygonal inner hole is a front threaded hole 4945, which is used to connect the corresponding tools to facilitate the application of axial force during the installation and removal of the base.

[0047] The abrasive warning device also includes a locking mechanism 499, which includes a radially extending locking hole in the base and a locking end hole 4914 (in this embodiment, the locking end hole is a conical pit) on the front wall of the outer casing. The inner end of the locking hole communicates with the polygonal inner hole. From the inside out, the locking hole consists of a threaded hole section 4943, a spring mounting hole section 4942, and a ball socket section 4941. In the installed state, each segment of the locking hole from the inside out is sequentially equipped with a screw plug 4993, a spring 4992, and a steel ball 4991. In the working state, the locking hole and the locking end hole are aligned. By screwing in the screw plug and compressing the spring, the steel ball is pushed against the inner surface of the locking end hole, thus locking the relative position of the outer casing and the base.

[0048] This invention also discloses an installation structure for an abrasive particle warning device, including a bearing housing for a planetary mechanism of a coal mining machine rocker arm (referred to as a cavity bearing housing 41) and the abrasive particle warning device 49. The cavity bearing housing is a disc-type part, including a bearing housing body with a bearing hole 418. The axis of the bearing hole extends horizontally front to back, and a retaining edge is provided at the rear end of the bearing hole for axial positioning of the bearing. A circular groove is provided in the middle of the rear end of the bearing housing body. Multiple cavities 411 are spaced apart in the circumferential direction within the bearing housing body, opening at the bottom of the groove and on the groove wall near the bottom. The rear end face of the retaining edge is located on the bottom of the groove. Because the bearing housing has multiple cavities, it can store a large amount of oil in the planetary mechanism it is in, thus greatly improving the heat storage capacity of the high-power planetary mechanism and ensuring the normal operation of the oil film. Due to the arrangement of the cavities, the weight of the bearing housing is greatly reduced. When the bearing housing is used in the final stage planetary mechanism of a coal mining machine rocker arm, the weight of the rocker arm's overhang can be appropriately reduced, improving the stability of the rocker arm.

[0049] The bearing housing body has a front outer stop 419 and a rear outer stop 417 at its front and rear ends, respectively. A wear warning device mounting hole 416 is provided on the mating end face of the front outer stop for mounting a wear warning device 49. The wear warning device mounting hole communicates with one of the cavities. The wear warning device is fixed to the bearing housing body via the flange structure. A seal is provided on the cylindrical surface of the outer shell that contacts the wear warning device mounting hole. Most of the wear warning device extends out of the corresponding cavity and can clean wear particles by adsorbing the wear particles in the oil within the corresponding cavity.

[0050] The bearing housing body has multiple oblique holes 413 and multiple radial through holes 414 arranged radially from the center. One end of each oblique hole is located on the front end face of the bearing housing body, near the inner edge of the front end face, and the other end of each oblique hole communicates with one of the cavities. Each radial through hole extends radially and penetrates one of the cavities. The oblique holes and radial through holes connect the semi-enclosed space inside the planetary mechanism with the inner cavity of the cavity, which facilitates the transfer of heat from the contact surface to the planetary mechanism oil pool through the oil. Finally, the heat is dissipated or carried away through the outer wall of the planetary mechanism or the cooling mechanism. The cavity communicates with the planetary mechanism oil pool through the oblique holes and radial through holes. Therefore, the abrasive particle warning device adsorbing abrasive particles in the oil inside the cavity is equivalent to adsorbing abrasive particles in the planetary mechanism oil pool, which plays a positive role in improving the cleanliness of the oil pool and the quality of the oil, and ensuring the normal operation of the oil film.

[0051] An oil drain hole 4101 is provided radially through the outer wall of one of the cavities of the bearing housing body. The outer end of the oil drain hole is located on the outer cylindrical surface of the bearing housing, and the inner end of the oil drain hole communicates with the corresponding cavity. The abrasive warning device mounting hole and the oil drain hole communicate with the same cavity, which is located at the lowest point in the circumferential direction relative to other cavities. The oil drain hole ensures that impurities at the bottom of the planetary mechanism's oil sump can be thoroughly removed.

[0052] The front outer stop is also provided with a housing groove 01 and a housing hole 02 on its mating end face. The wiring of the abrasive early warning sensor is led out from the housing wire passage groove and then routed through the housing groove and housing hole. The housing groove, housing hole, base wire passage groove and housing wire passage groove not only facilitate the wiring of the abrasive early warning sensor, but also provide good protection for the wiring.

[0053] The orientation described in this article refers to the orientation of the rocker arm of the coal mining machine when it is in use. The direction closer to the coal face is the front, and the direction farther from the coal face is the rear.

Claims

1. An abrasive particle early warning device, characterized in that: The device includes a coaxially arranged outer shell, inner shell, and base. The outer shell is a barrel-shaped structure with an open front and a closed rear, and the front end of the outer shell is configured as a flange. The base is a hollow stepped shaft structure with a thicker front and a thinner rear, forming a stepped surface between the thicker and thinner shaft sections. The front part of the base is embedded in the front inner hole of the outer shell, and a seal is provided between the cylindrical surfaces of the outer shell and the base where they fit together. The inner shell is a cylindrical structure, and the inner shell and the outer shell form a shaft hole fit. The upper axial limit of the inner shell is located between the rear end of the outer shell and the stepped surface of the base. The connection end of an abrasive particle warning sensor is installed in the core of the base, and the sensing part of the abrasive particle warning sensor extends out from the rear of the base and into the inner hole of the inner shell. The outer shell and the inner shell are respectively provided with through-holes. The device includes an outer shell oil groove and an inner shell oil groove. A circumferential limiting structure is provided between the inner shell and the base. By rotating the base, the inner shell can be rotated relative to the outer shell, allowing the abrasive warning device to switch between working and maintenance states. In the working state, the outer shell oil groove and the inner shell oil groove are connected. In the maintenance state, the outer shell oil groove and the inner shell oil groove are not connected. The inner shell has a circumferentially extending arc-shaped groove with the opening facing outwards. The outer shell has a radially penetrating threaded hole. The position of the threaded hole in the axial direction is aligned with the arc-shaped groove. A positioning screw is installed in the threaded hole of the outer shell. The inner end of the positioning screw is inserted into the arc-shaped groove. In the working state and the maintenance state, the inner end of the positioning screw rests against the two ends of the arc-shaped groove, respectively.

2. The abrasive particle early warning device as described in claim 1, characterized in that: The front end of the inner shell is provided with an axially protruding boss, and the front shaft section of the base is provided with a radially extending groove with the opening facing backward. The boss is embedded in the groove to form the circumferential limiting structure.

3. The abrasive particle early warning device as described in claim 1, characterized in that: Both the outer shell oil groove and the inner shell oil groove are multiple axially extending elongated holes arranged circumferentially. In the working state, the outer shell oil groove and the inner shell oil groove correspond one-to-one. In the maintenance state, the outer shell oil groove and the inner shell oil groove are staggered.

4. The abrasive particle early warning device as described in claim 1, characterized in that: The base and the outer shell are respectively provided with a base wire passage groove and an outer shell wire passage groove. The wiring of the abrasive early warning sensor passes through the core of the base and then runs through the base wire passage groove and the outer shell wire passage groove in sequence.

5. The abrasive particle early warning device as described in claim 1, 2, 3 or 4, characterized in that: The front section of the core inner hole of the base is a polygonal inner hole, and adjacent to the polygonal inner hole is a front threaded hole.

6. The abrasive particle early warning device as described in claim 5, characterized in that: It also includes a locking mechanism, which includes a radially extending lock hole disposed in the base and a locking end hole disposed on the front hole wall of the housing. The inner end of the lock hole communicates with the polygonal inner hole. The lock hole consists of a threaded hole section, a spring mounting hole section and a ball socket section from the inside to the outside. In the installed state, a screw plug, a spring and a steel ball are installed in each section of the lock hole from the inside to the outside. In the working state, the lock hole and the locking end hole are directly opposite each other, and the steel ball abuts against the inner surface of the locking end hole.

7. An installation structure for an abrasive particle early warning device, characterized in that: The invention includes a bearing housing for a planetary mechanism of a coal mining machine rocker arm and an abrasive warning device as described in claims 1, 2, 3, 4, 5, or 6. The bearing housing is a disc-type part, comprising a bearing housing body, a bearing hole on the bearing housing body, the axis of the bearing hole extending horizontally front to back, a retaining edge at the rear end of the bearing hole, a circular groove in the middle of the rear end of the bearing housing body, and multiple cavities spaced apart in a circumferential direction within the bearing housing body. The cavities open at the bottom of the groove and on the groove wall near the bottom of the groove. The rear end face of the retaining edge is located on the bottom of the groove. The front and rear ends of the bearing housing body are respectively provided with a front outer stop and a rear outer stop. An abrasive warning device mounting hole is opened on the mating end face of the front outer stop. The abrasive warning device mounting hole communicates with one of the cavities. The abrasive warning device is fixed to the bearing housing body by the flange structure, and most of the abrasive warning device is suspended in the corresponding cavity.

8. The installation structure of the abrasive particle early warning device as described in claim 7, characterized in that: The bearing housing body has multiple oblique holes and multiple radial through holes distributed radially in a central radial pattern. One end of each oblique hole is opened on the front end face of the bearing housing body and is close to the inner edge of the front end face. The other end of each oblique hole communicates with one of the cavities. Each radial through hole extends radially and penetrates one of the cavities.

9. The installation structure of the abrasive particle early warning device as described in claim 8, characterized in that: An oil drain hole is provided radially through the outer wall of one of the cavities of the bearing housing body. The abrasive warning device mounting hole and the oil drain hole are connected to the same cavity, and the cavity is located at the lowest point in the circumferential direction relative to the other cavities.

10. The installation structure of the abrasive particle early warning device as described in claim 9, characterized in that: The front outer stop is also provided with a housing groove and a housing hole on the joint end face. The wiring of the abrasive early warning sensor is led out from the housing through the wire groove and then run through the housing groove and housing hole.

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