Grab with self-generating equipment

Abstract

The utility model belongs to bulk material handling equipment technical field, concretely relates to a kind of grab self-generating equipment, including shell, partition is provided in the shell, the partition separates the shell into mechanical bin and electrical bin, steel wire rope exit hole is set in shell bottom, shell edge area is set with multiple symmetric distribution's mounting hole.The utility model is through the self-generating mechanism of steel wire rope reel, volute spring, ratchet gear set and power generation, utilizes grab opening and closing mechanical movement autonomous power generation and electric energy storage, completely get rid of the dependence on overhead cable, solve the wear and tear, breakage problem caused by the dependence on cable of traditional power supply and anti-winding device, eliminate power supply interruption risk and security risk, improve grab electrical element power supply stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of bulk material loading and unloading equipment. Specifically, it relates to a grab bucket self-generating device, which is suitable for double-jaw four-rope grab buckets, especially for unloading ships in the metallurgical industry to provide an independent and stable power supply for electrical components such as sensors and control modules mounted on the grab bucket during the loading and unloading of bulk materials such as coal and iron ore. Background Technology

[0002] In the field of bulk material handling operations, the double-jaw four-rope grab bucket, as the core lifting tool of ship unloaders, is widely used in the lifting and transportation of bulk materials such as coal and iron ore. As ship unloaders develop towards automation and intelligence, the grab bucket needs to be equipped with electrical components such as weight sensors, position sensors, and small control modules to achieve real-time monitoring of the grab bucket's operating condition and automated operation control. The stable power supply of such electrical components has become a key technical requirement to ensure the reliable operation of the grab bucket.

[0003] Currently, there are three main types of power supply methods for the electrical components of grab buckets, each with significant technical defects, as detailed below: Firstly, there is the traditional suspended cable power supply method. This method directly supplies power to electrical components via a suspended cable extending from the main body of the ship unloader to the grab bucket. However, grab bucket operations have inherent challenges: the ship unloader's operating speed can reach up to 120 m / min, the lifting height is typically 15-30 m, and the grab bucket experiences continuous swaying and vibration during loading and unloading. The suspended cable is prone to wear and tear due to repeated stretching, friction, and impact, and may even break. This not only leads to power outages, affecting the normal operation of electrical components such as sensors and control modules, but also risks equipment collision damage or personnel accidents due to cable detachment, severely restricting the stability and safety of grab bucket operations.

[0004] Secondly, there is an improved power supply method based on a cable anti-winding device. To alleviate cable wear, an existing technology discloses a grab bucket cable anti-winding device (patent number: CN202765858U). Its technical solution involves setting a mounting frame on the grab bucket body, with a cable reel for winding the power supply cable rotatably connected to the mounting frame. A drive motor is configured on one side of the cable reel to achieve synchronous winding and unwinding of the cable and the grab bucket. Simultaneously, a damper is added to the mounting frame to limit the cable reel's rotational speed, attempting to reduce the probability of wear by decreasing cable dragging and winding. However, this solution still relies on the power supply cable and has new technical limitations: on the one hand, the drive motor needs to obtain additional power from the unloader, increasing the complexity of system wiring and energy loss; on the other hand, under the dynamic conditions of high-speed operation and frequent oscillation of the grab bucket, the damper's rotational speed control accuracy is difficult to match the grab bucket's displacement changes in real time. The cable still faces the risk of localized overstretching or friction with the equipment structure, failing to fundamentally eliminate the potential for power outages caused by cable wear and breakage, and even more so, failing to solve the power supply problem for the grab bucket in scenarios without external cable coverage.

[0005] Thirdly, there's the issue of disposable battery power. Some grabs have attempted to use disposable batteries to power their electrical components, but grabs typically operate more than 500 times a day, and disposable batteries have a short lifespan (generally requiring replacement every 1-2 weeks). Frequent battery replacements not only incur significant labor costs but also disrupt continuous loading and unloading operations, leading to a decrease in the overall operating efficiency of the unloader and making it difficult to meet the demands for continuous and efficient bulk material handling.

[0006] In summary, existing technologies, whether traditional suspended cable power supply, improved cable power supply based on CN202765858U, or disposable battery power supply, all have insurmountable drawbacks—either relying on cables easily leads to power supply safety hazards, or having poor endurance and high maintenance costs affecting operational efficiency, failing to provide a long-term, stable, autonomous, and reliable power supply for the grab bucket's electrical components. Therefore, developing a device adapted to the high-speed, high-lift operation conditions of grab buckets, capable of autonomously generating and storing energy using the grab bucket's own movement, has become an urgent technological need to address the current pain points in grab bucket power supply. Utility Model Content

[0007] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a grab bucket self-generating power device that generates electricity through the mechanical movement during the opening and closing process of the grab bucket, thereby achieving autonomous generation and storage of electrical energy and providing continuous power to the grab bucket's electrical components.

[0008] According to the present invention, a grab bucket self-generating device includes a housing, a partition is provided inside the housing, the partition divides the housing into a mechanical compartment and an electrical compartment, a wire rope lead-out hole is provided at the bottom of the housing, and a plurality of symmetrically distributed mounting holes are provided at the edge area of ​​the housing. The mechanical compartment is equipped with a wire rope drum, a spiral spring, a ratchet gear set and a generator; the outer surface of the wire rope drum has a wire rope groove, the center of the wire rope drum is fixedly connected to a drum shaft, the two ends of the drum shaft are respectively rotatably connected to the inner wall of the mechanical compartment, and a connecting post is provided at the left end of the wire rope drum. The outer end of the spiral spring is provided with a connecting ring, which is fixedly connected to the connecting post. The inner center end of the spiral spring is provided with a fixing buckle. The center of the inner side of the left side shell of the mechanical compartment is provided with a drum shaft sleeve. The outer edge of the drum shaft sleeve is provided with a fixing buckle groove, and the fixing buckle engages with the fixing buckle groove. A power gear is fixedly connected to the right end of the drum shaft. The ratchet gear assembly is fixed inside the machine compartment via a ratchet gear assembly mounting shaft. The ratchet gear assembly includes a driving gear, a driven gear, a central shaft, two pawls, and two springs. The driven gear has bushings on both sides of its center, and its central hole is an internal ratchet structure. The central shaft has bushings on its outer side with grooves at the top and bottom. Spring holes are formed at the bottom of the grooves. The pawls are embedded in the grooves, and the lower end of the spring is embedded in the spring hole, while the upper end contacts the pawl. The driving gear includes a shaft seal and a gear. A central shaft mating hole is formed on one side of the shaft seal, and the central shaft bushing fits tightly with the central shaft mating hole. The driving gear meshes with the driving gear, and the driven gear meshes with the generator gear of the generator. The generator is fixed in the machine compartment by a generator bracket and a generator cover plate, and the generator output end is led out with wires through a generator connector. The electrical compartment is equipped with a battery, a battery charging management chip, and a 3.3V voltage regulator chip; the generator is electrically connected to the battery charging management chip, the battery charging management chip is electrically connected to the battery, and the battery is connected to the interface of external power components through the 3.3V voltage regulator chip. One end of the wire rope is fixed in the wire rope groove of the wire rope drum, and the other end extends through the wire rope lead-out hole to the outside of the housing, and the extended end is connected to the wire rope fixing end.

[0009] In a preferred embodiment: the ratchet gear set further includes a sealing end cover, which is a disc structure with a shaft hole in the middle. The size of the shaft hole is the same as that of the drive gear, and the sealing end cover is embedded in the bushing of the driven gear.

[0010] In a preferred embodiment: the power gear has a module of 1 and 50 teeth, the driving gear has a module of 1 and 10 teeth, the driven gear has a module of 1 and 50 teeth, the generator gear has a module of 1 and 10 teeth, and the transmission ratio between the power gear and the generator gear is 1:25.

[0011] In a preferred embodiment: the battery is a 5000mAh lithium battery, the battery charging management chip is an SGM41574 chip, the input voltage range of the SGM41574 chip is 3.6V to 30V, and the current consumption in the shutdown mode is as low as 0.4uA.

[0012] In a preferred embodiment: the mechanical compartment is provided with a drum support, the drum shaft is fixed to the drum support by a drum shaft cover plate, and the drum shaft can rotate on the drum support but cannot move left or right.

[0013] In a preferred embodiment: the connection line between the generator and the battery charging management chip passes through the wire hole of the partition plate, and the wire hole of the partition plate and the wire inlet of the electrical compartment are both provided with a sealing structure; the housing is made of reinforced flame-retardant ABS material, and the exterior of the housing is provided with a metal guardrail.

[0014] In a preferred embodiment: the electrical compartment is equipped with a circuit board, on which the battery, battery charging management chip and 3.3V voltage regulator chip are integrated. The circuit board is fixed to the inner wall of the electrical compartment by bolts.

[0015] In a preferred embodiment: the wire rope groove adopts a spiral structure, the pitch of which matches the diameter of the wire rope, and the fixed end of the wire rope and the wire rope groove is provided with an anti-detachment buckle.

[0016] In a preferred embodiment: the top edge of the housing is provided with a cover plate mounting post, and an electrical compartment cover plate is fixed to the cover plate mounting post by bolts. A sealing ring is provided on the inner side of the electrical compartment cover plate.

[0017] In a preferred embodiment: the meshing clearance between the generator gear and the driven gear is 0.1-0.2mm, and the output voltage range of the generator is 3.6V-12V.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model uses a self-generating mechanism consisting of a wire rope drum, a spiral spring, a ratchet gear set, and a generator to generate and store electrical energy autonomously by utilizing the mechanical movement of the grab bucket's opening and closing mechanism. This completely eliminates the dependence on suspended cables, solves the wear and breakage problems caused by the reliance on cables in traditional power supply and anti-tangle devices, eliminates the risk of power outages and safety hazards, and improves the power supply stability of the grab bucket's electrical components.

[0019] 2. This utility model relies on the opening and closing action necessary for grab bucket operation to drive power generation, and combines with the battery to form a closed loop of "movement-power generation-storage-power supply". It eliminates the need for frequent replacement of disposable batteries to reduce labor costs and avoid operation interruption. It also eliminates the need for an additional drive motor, avoiding energy consumption and wiring complexity, and improving the operating efficiency of the ship unloader.

[0020] 3. This utility model adopts a reinforced flame-retardant ABS shell and external metal guardrail, combined with the isolation design of the mechanical compartment and electrical compartment and the sealing structure of key parts, which can resist the dust, water vapor and vibration impact of grab bucket operation. In addition, the ratchet gear set is equipped with a sealed end cover to reduce wear, thereby improving the equipment's ability to adapt to harsh working conditions and its service life.

[0021] 4. This utility model utilizes the unidirectional transmission characteristic of the ratchet gear set to drive the generator to generate electricity only when the grab bucket is open, and cuts off the transmission when it is closed to avoid consuming the potential energy of the vortex spring, thereby maximizing the effective energy utilization of the grab bucket's movement, improving power generation efficiency, and ensuring long-term stable power supply to electrical components. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the internal structure of this utility model; Figure 2 This is a bottom view of the present invention; Figure 3 This utility model Figure 1 AA cross-section view; Figure 4 This utility model Figure 1 CC cross-section; Figure 5 This is a schematic diagram of the ratchet gear assembly structure of this utility model; Figure 6 This is a schematic diagram of the installation of this utility model on a grab bucket.

[0023] The following are the labeling elements in the figure: Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0025] This utility model discloses a grab bucket self-generating device, including a shell 1. The shell 1 is made of reinforced flame-retardant ABS material to avoid signal shielding and increase the impact resistance of the device. The shell 1 is equipped with a metal guardrail. A partition is provided inside the shell 1, which divides the shell 1 into a mechanical compartment 2 and an electrical compartment 3. The partition has a wire hole for the generator wire to pass through. The wire hole and the electrical compartment inlet hole 45 are both equipped with a sealing structure. The sealing structure can effectively prevent dust and moisture from entering the electrical compartment 3 from the mechanical compartment 2, protecting the electrical components. The mechanical compartment 2 is used to install the power generation transmission components, and the electrical compartment 3 is used to install the energy storage and management components.

[0026] The bottom of the housing 1 is provided with a wire rope lead-out hole 28, which allows the wire rope 27 to enter and exit. The edge area of ​​the housing 1 is provided with 4-6 symmetrically distributed mounting holes 59, which are used to fix the equipment to the end of the grab bucket pulley.

[0027] The mechanical compartment 2 is equipped with a wire rope drum 5. The outer surface of the wire rope drum 5 is provided with a wire rope groove 48. The wire rope groove 48 adopts a spiral structure so that the pitch matches the diameter of the wire rope 27. The wire rope groove 48 winds the wire rope 27 in an orderly manner to avoid the wire rope 27 from being tangled. The center of the wire rope drum 5 is fixedly connected to the drum shaft 14. Both ends of the drum shaft 14 are rotatably connected to the inner wall of the mechanical compartment 2 through bearings to ensure smooth rotation of the drum. A connecting post 15 is provided at the left end of the wire rope drum 5. The connecting post 15 is used to connect the spiral spring 6.

[0028] The mechanical compartment 2 is also equipped with a vortex spring 6. The outer end of the vortex spring 6 is provided with a connecting ring 49. The connecting ring 49 is fixedly connected to the connecting post 15 of the wire rope drum 5. The inner center end of the vortex spring 6 is provided with a fixing buckle 16. When the wire rope drum 5 rotates, the vortex spring 6 synchronously stretches or contracts to store / release energy.

[0029] The inner center of the left side shell 1 of the mechanical compartment 2 is provided with a drum shaft sleeve 17, and a fixing buckle groove 18 is provided on the outer edge of the drum shaft sleeve 17. The fixing buckle 16 engages with the fixing buckle groove 18, so that the center of the spiral spring 6 is fixed to the shell 1.

[0030] A ratchet gear set 7 is installed inside the mechanical compartment 2. The ratchet gear set 7 is fixed inside the mechanical compartment 2 by the ratchet gear set mounting shaft 42. The ratchet gear set 7 includes a driving gear 20, a driven gear 21, a central shaft 22, two pawls 23 and two springs 24.

[0031] The driven gear 21 has bushings 46 on both sides of its center and a ratchet 50 structure in the center hole. The central shaft 22 has bushings 46 on its outer side and grooves 51 on its upper and lower sides. The bottom of the grooves 51 has a spring hole 52. The pawl 23 is inserted into the grooves 51. The lower end of the spring 24 is inserted into the spring hole 52. The upper end of the spring 24 is in contact with the pawl 23. The central shaft 22 and the central shaft mating hole 55 of the driving gear 20 are interference-fitted to ensure synchronous rotation. After the pawl 23 is inserted into the groove 51 of the central shaft 22, the spring 24 is in a slightly compressed state, so that the pawl 23 always fits the ratchet 50 structure of the driven gear 21.

[0032] The drive gear 20 includes a shaft seal 38 and a gear 54. A central shaft mating hole 55 is provided on one side of the shaft seal 38, and the bushing 46 of the central shaft 22 is tightly fitted with the central shaft mating hole 55.

[0033] The right side of the drum shaft 14 of the wire rope drum 5 is fixedly connected to the power gear 19. The power gear 19 meshes with the driving gear 20, and the driven gear 21 meshes with the generator gear 25 of the generator 8.

[0034] The ratchet gear set 7 also includes a sealing end cover 37, which is a disc structure with a shaft hole in the middle. The size of the shaft hole is the same as that of the shaft hole of the drive gear 20. The sealing end cover 37 is embedded in the bushing 46 of the driven gear 21.

[0035] A generator 8 is installed inside the mechanical compartment 2. The generator 8 is fixed inside the mechanical compartment 2 by a generator bracket 33 and a generator cover plate 34. The generator bracket 33 is fixed to the inner wall of the mechanical compartment 2 by bolts, and the generator cover plate 34 is fastened to the outside of the generator 8 to prevent mechanical collision. The output end of the generator 8 leads out a wire through the generator connector 40 and is connected to the electrical compartment 3 through the wire. The input shaft of the generator 8 is fixedly connected to the generator gear 25. The generator gear 25 meshes with the driven gear 21 of the ratchet gear set 7. The meshing clearance between the generator gear 25 and the driven gear 21 is 0.1-0.2mm to ensure stable transmission and avoid jamming.

[0036] The electrical compartment 3 houses a battery 10, a battery charging management chip 11, and a 3.3V voltage regulator chip 30. The battery 10 is a 5000mAh lithium battery, and the battery charging management chip 11 is an SGM41574 chip with an input voltage of 3.6V-30V and a shutdown mode current of 0.4uA. The generator 8 is electrically connected to the battery charging management chip 11, and the battery charging management chip 11 is electrically connected to the battery 10. The battery 10 is connected to the external power component interface 36 through the 3.3V voltage regulator chip 30 to supply power to the grab sensor, control module, etc. The electrical compartment 3 also contains a circuit board 44, in which the battery 10, battery charging management chip 11, and 3.3V voltage regulator chip 30 are integrated, improving integration and reducing wiring. The top edge of the housing 1 has a cover plate mounting post for installing the electrical compartment cover plate 35 for easy maintenance.

[0037] One end of the wire rope 27 is fixed in the wire rope groove 48 of the wire rope drum 5, and the other end extends through the wire rope lead-out hole 28 at the bottom of the housing 1 to the outside of the housing 1. The extended end is connected to the wire rope fixing end 47, which is used to fix to the moving pulley end of the grab bucket.

[0038] Power gear 19: Module 1, 50 teeth; Drive gear 20: Module 1, 10 teeth; Driven gear 21: Module 1, 50 teeth; Generator gear 25: Module 1, 10 teeth; Calculated based on the meshing relationship, the transmission ratio between power gear 19 and generator gear 25 is 1:25, meaning that for every 1 rotation of the wire rope drum 5, the generator gear 25 rotates 25 times. Even when the grab bucket is opened, the wire rope drum 5 rotates slowly, with a minimum speed of 5 r / min, the generator 8 can still reach a speed of 125 r / min, meeting the power generation requirements, with an output voltage of 3.6V-12V.

[0039] Working principle When the grab bucket is opened, the distance between the moving pulley and the fixed pulley increases, the wire rope 27 is stretched, and the wire rope drum 5 rotates counterclockwise. The rotation of the drum drives the spiral spring 6 to stretch and store energy through the connecting column 15. At the same time, the power gear 19 on the drum shaft 14 rotates counterclockwise, driving the drive gear 20 of the ratchet gear set 7 to rotate. At this time, the pawl 23 engages with the ratchet 50 of the driven gear 21 under the action of the spring 24. The drive gear 20 drives the driven gear 21 to rotate through the pawl 23. The driven gear 21 drives the generator gear 25 to rotate, so that the generator 8 generates electricity. The electrical energy output by the generator 8 is transmitted to the battery charging management chip 11 in the electrical compartment 3 through the generator connector 40. The chip stores the electrical energy in the lithium battery 10 after voltage stabilization and current limiting.

[0040] After storing electrical energy, the battery 10 stabilizes the voltage to 3.3V through the 3.3V voltage regulator chip 30, and then supplies power to the sensors, control modules and other components on the grab bucket through the external power component interface 36; the battery charging management chip 11 has overcharge and over-discharge protection functions to prevent damage to the battery 10.

[0041] When the grab closes, the distance between the moving pulley and the fixed pulley decreases, the vortex spring 6 releases its potential energy, and drives the wire rope drum 5 to rotate clockwise, thus recovering the wire rope 27. At this time, the power gear 19 rotates clockwise, driving the drive gear 20 to rotate clockwise. The pawl 23 compresses the spring 24 under the action of the inclined surface of the ratchet 50 of the driven gear 21, disengaging from the ratchet 50. The driven gear 21 stops rotating, and the generator 8 stops generating electricity to avoid consuming the potential energy of the vortex spring 6, ensuring that the wire rope 27 is successfully recovered.

[0042] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A grab bucket self-generating device, characterized in that, Includes a housing (1), which is divided into a mechanical compartment (2) and an electrical compartment (3) by a partition; the bottom of the housing (1) is provided with a wire rope lead-out hole (28); The mechanical compartment (2) is equipped with a wire rope drum (5), a spiral spring (6), a ratchet gear set (7), and a generator (8); the wire rope drum (5) has a wire rope groove (48) on its outer periphery, a drum shaft (14) passes through its center, and a connecting post (15) is provided at its left end; the outer end of the spiral spring (6) is fixed to the drum connecting post (15) by a connecting ring (49), and the inner end is snapped into the snap groove (18) of the drum shaft bushing (17) of the housing by a fixing buckle (16); a power gear (19) is connected to the right end of the drum shaft (14). The ratchet gear set (7) is fixed in the machine compartment (2) by the mounting shaft (42), including the driving gear (20), the driven gear (21), the central shaft (22), the pawl (23) and the spring (24). The power gear (19) meshes with the driving gear (20), and the driven gear (21) meshes with the generator gear (25). The generator (8) is fixed by the bracket (33) and the cover plate (34), and the output end is connected to the wire. The electrical compartment (3) is equipped with a battery (10), a battery charging management chip (11) and a 3.3V voltage regulator chip (30). The output terminal of the generator (8) is connected to the charging management chip (11), the charging management chip (11) is connected to the battery (10), and the battery (10) is connected to the external power component interface (36) via the voltage regulator chip (30). One end of the wire rope (27) is fixed in the wire rope groove (48), and the other end extends through the lead-out hole (28) to the outside of the shell and is connected to the wire rope fixing end (47).

2. The grab bucket self-generating device according to claim 1, characterized in that, The ratchet gear set (7) is equipped with a sealing end cover (37), which is a disc structure with a shaft hole in the center that matches the size of the drive gear shaft hole and is embedded in the passive gear bushing (46).

3. The grab bucket self-generating device according to claim 1, characterized in that, The power gear (19) has a module of 1 and a number of teeth of 50, the driving gear (20) has a module of 1 and a number of teeth of 10, the driven gear (21) has a module of 1 and a number of teeth of 50, the generator gear (25) has a module of 1 and a number of teeth of 10, and the transmission ratio between the power gear (19) and the generator gear (25) is 1:

25.

4. The grab bucket self-generating device according to claim 1, characterized in that, The battery (10) is a 5000mAh lithium battery, and the battery charging management chip (11) is an SGM41574 chip with an input voltage range of 3.6V to 30V and a current of 0.4uA in the off mode.

5. The grab bucket self-generating device according to claim 1, characterized in that, The mechanical compartment (2) is equipped with a drum support. The drum shaft (14) is fixed to the drum support by a drum shaft cover plate and can rotate around its own axis while restricting left and right movement.

6. The grab bucket self-generating device according to claim 1, characterized in that, The connection line between the generator (8) and the charging management chip (11) passes through the partition wire hole, and the partition wire hole and the electrical compartment inlet hole (45) are both provided with a sealing structure; the housing (1) is made of reinforced flame-retardant ABS material and is provided with a metal guardrail on the outside.

7. The grab bucket self-generating device according to claim 1, characterized in that, The electrical compartment (3) is equipped with a circuit board (44), on which the battery (10), charging management chip (11) and voltage regulator chip (30) are integrated. The circuit board (44) is fixed to the inner wall of the electrical compartment (3) by bolts.

8. The grab bucket self-generating device according to claim 1, characterized in that, The wire rope groove (48) has a spiral structure, and its pitch matches the diameter of the wire rope (27). The fixed ends of the wire rope (27) and the wire rope groove (48) are provided with anti-detachment buckles.

9. The grab bucket self-generating device according to claim 1, characterized in that, The top edge of the housing (1) is provided with a cover plate mounting post, and an electrical compartment cover plate (35) is fixed to the cover plate mounting post by bolts. A sealing ring is provided on the inner side of the cover plate.

10. The grab bucket self-generating device according to claim 1, characterized in that, The meshing clearance between the generator gear (25) and the driven gear (21) is 0.1-0.2mm, and the output voltage range of the generator (8) is 3.6V-12V.

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