An automatically lubricated coal grab bucket

Abstract

This invention relates to the field of coal grab bucket technology, and in particular to an automatically lubricated coal grab bucket, comprising a grabbing mechanism including a lifting plate, a support rod, a rotating shaft, a bucket body, and a lifting block; a sealing mechanism including a frame, a folding plate, and a cleaning brush; and a lubrication mechanism including an oil hole, a dust cover, lubricating oil, and a push rod. The folding plate folds and extends during the bucket body's movement, effectively encapsulating the coal and preventing coal ash and dust from entering the rotating shaft and clogging the oil injection hole. It also prevents coal ash from overflowing and polluting the environment. Simultaneously, the brush plate on the side of the folding plate cleans the inner wall of the bucket, collecting coal ash from the inner wall and reducing overflow. Furthermore, the rotation of the grab bucket and support rod drives the lubricating oil in the dust cover into the oil hole, achieving automatic lubrication. The faster the grab bucket grabs, the higher the lubricating oil injection rate, adapting to high-intensity working conditions while reducing manual operation and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal grab technology, and in particular to an automatically lubricated coal grab. Background Technology

[0002] A coal grab is a mechanical device used for loading and unloading coal. It is commonly found in coal mines, power plants, and other similar locations for extracting, transporting, and stockpiling coal. The grab shell is typically made of steel, possessing sufficient strength and rigidity to withstand working loads. The grab body controls the loading and unloading of coal, and this control can be achieved hydraulically or mechanically. The grab chain connects the grab shell and the transmission mechanism, enabling the grab to open, close, and operate.

[0003] The working principle of a coal grab bucket is that the bucket body opens and closes vertically, driven by a grab bucket chain. When the bucket body opens, coal can be grabbed and fed into it; when the bucket body closes, the coal is trapped inside. As the grab bucket chain moves, the grab bucket lifts or moves the coal to the target location, and then the grab bucket door reopens, completing the unloading process. The purpose of a coal grab bucket is to facilitate the loading, unloading, and stacking of coal. It can efficiently extract large quantities of coal and deliver them to designated locations, realizing the transportation and stacking of coal. By using coal grab buckets, manual labor intensity can be reduced, production efficiency can be improved, and the risks and safety hazards during coal transportation can also be reduced.

[0004] During the operation of a coal grab bucket, the rotating shaft connects both the bucket body and the support rod. The stress it bears during the full-load rotation of the bucket body is very high. Therefore, the rotating shaft needs to be lubricated during use to prevent noise and wear caused by untimely lubrication. Existing oil injection devices usually require manual judgment of the appropriate oiling time, which may lead to certain errors in the amount of oil injected or untimely lubrication.

[0005] Meanwhile, due to the high content of coal ash and dust in the coal environment, some coal dust can easily enter through the oil holes, thereby clogging the rotating shaft and causing wear or blocking the lubrication pipes, preventing oil injection, resulting in inflexible rotation of the bucket and mechanical failure. At the same time, dust is more likely to be generated during the opening and closing of the grab bucket, and the dust can also easily accumulate and clump on the inner wall of the bucket, affecting the grabbing efficiency. Current technology requires manual cleaning of the dust on the inner wall of the bucket, but this is inefficient, affects normal operation, and is highly dangerous. Summary of the Invention

[0006] In view of the above problems, the present invention is proposed.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an automatically lubricated coal grab bucket, comprising a grabbing mechanism including a lifting plate, a support rod rotatably disposed on the end face of the lifting plate, a rotating shaft disposed within the support rod, a bucket body rotatably sleeved on the outer wall of the rotating shaft, and a lifting block rotatably disposed on the end face of the bucket body; and a sealing mechanism including a frame disposed on the end face of the bucket body, a folding plate slidably disposed within the frame, and a cleaning brush disposed on the end face of the folding plate; and a lubrication mechanism including an oil hole disposed on the end face of the rotating shaft, a dust cover rotatably disposed on the end face of the bucket body, lubricating oil disposed within the dust cover, and a push rod slidably disposed on the inner wall of the dust cover.

[0008] As a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, the frame has grooves on both sides, rollers are slidably arranged in the grooves, a transmission belt is also provided in the grooves, the rollers are symmetrically arranged on both sides of the transmission belt and a transmission shaft is provided between the rollers on both sides.

[0009] In a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, the outer wall of the drive shaft is provided with drive teeth, and the drive shaft is engaged with the inner wall of the drive belt through the drive teeth.

[0010] In a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, the drive shaft rotatably penetrates into the interior of the folding plate, the outer wall of the folding plate is provided with an array of brush plates, the end face of the folding plate is provided with a rotating column, and the folding plates are rotatably connected to each other through the rotating column.

[0011] In a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, a rotating wheel and a guide wheel are respectively rotatably provided at both ends of the inner wall of the transmission belt, the rotating wheel and the guide wheel simultaneously mesh with the inner wall of the transmission belt, and the width of the chute is larger the closer it is to the groove opening of the rotating wheel.

[0012] In a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, a cylinder is rotatably fitted on the outer wall of the dust cover, the cylinder is connected to the outer wall of the support rod, and the oil hole is located inside the dust cover.

[0013] As a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, the inner wall of the cylinder is provided with internal threads, the push rod slides through the dust cover, and the outer wall of the dust cover is provided with air holes.

[0014] In a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, the outer wall of the push rod is provided with a disc, the outer wall of the disc is provided with an external thread, and the disc is screwed into the inner wall of the cylinder through the thread.

[0015] As a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, the outer wall of the push rod is rotatably fitted with a platform, the end face of the platform is provided with ratchet teeth, the push rod rotatably passes through the end face of the platform and the outer wall of the push rod is rotatably provided with a turntable, the outer wall of the turntable is provided with an array of pawls, a first elastic element is provided between the pawls and the turntable, and the platform is fixedly provided on the end face of the cylinder.

[0016] In a preferred embodiment of the automatically lubricated coal grab bucket of the present invention, a transmission gear is provided at the end of the push rod away from the dust cover, and the rotating wheel is disposed inside the transmission gear.

[0017] The beneficial effects of this invention are as follows: The grab bucket's gripping motion drives the folding plate to extend and fold, thereby achieving a complete enclosure and sealing of the grabbed coal. This prevents coal ash and dust from entering the rotating shaft and clogging the oil injection hole, while also preventing a large amount of coal ash from overflowing and polluting the environment. Simultaneously, the extension and retraction of the folding plate is accompanied by brushes on the sides of the folding plate cleaning the inner wall of the bucket. The cleaned coal ash is collected inside the bucket, reducing overflow. Furthermore, as the grab bucket and support rod rotate, the lubricating oil inside the dust cover enters the oil hole, achieving automatic lubrication. The faster the grab bucket grips, the higher the lubricating oil injection rate, adapting to high-intensity working conditions while reducing manual operation and improving work efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0019] Figure 1 This is an overall view of the automatically lubricated coal grab bucket of the present invention.

[0020] Figure 2 This is an enlarged view of a partial structure of the automatically lubricated coal grab bucket in this invention.

[0021] Figure 3 This is a schematic diagram of the working state of the folding plate in this invention.

[0022] Figure 4 This is a schematic diagram of the folding plate shrinkage process in this invention.

[0023] Figure 5 This is a schematic diagram of the unfolding process of the folding plate in this invention.

[0024] Figure 6 This is a schematic diagram of the internal structure of the dust cover and oil hole in the oil injection process of the present invention.

[0025] Figure 7 Enlarged view of the platform and disk. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1

[0030] Reference Figures 1-3 This is the first embodiment of the present invention. This embodiment provides an automatically lubricated coal grab bucket, including a grabbing mechanism 100, a sealing mechanism 200, and a lubrication mechanism 300. The upper end of the bucket body 104 is sealed by a folding plate 202 provided in the frame 201 to prevent dust from splashing into the rotating shaft 103 or into the surrounding air during the coal grabbing process.

[0031] Specifically, the automatically lubricated coal grab includes a grabbing mechanism 100, comprising a lifting plate 101, a support rod 102 rotatably disposed on the end face of the lifting plate 101, a rotating shaft 103 disposed within the support rod 102, a bucket body 104 rotatably sleeved on the outer wall of the rotating shaft 103, and a lifting block 105 rotatably disposed on the end face of the bucket body 104; a sealing mechanism 200, comprising a frame 201 disposed on the end face of the bucket body 104, a folding plate 202 slidably disposed within the frame 201, and a cleaning brush 203 disposed on the end face of the folding plate 202; and a lubrication mechanism 300, comprising an oil hole 301 disposed on the end face of the rotating shaft 103, a dust cover 302 rotatably disposed on the end face of the bucket body 104, lubricating oil 303 disposed within the dust cover 302, and a push rod 304 slidably disposed on the inner wall of the dust cover 302.

[0032] Two buckets 104 are symmetrically arranged, and the two ends of the two buckets 104 are rotatably connected to the rotating shaft 103 and the lifting block 105, respectively. The two buckets 104 clamp each other to prevent coal leakage. The rotating shaft 103 is fixed inside the support rod 102. The buckets 104 and the rotating shaft 103 rotate relative to each other. The lifting block 105 is driven by a hydraulically driven guide cable to lift and achieve the lifting function.

[0033] Preferably, the frame 201 has grooves 201a on both sides, and rollers 201b are slidably arranged in the grooves 201a. A transmission belt 201c is also provided in the grooves 201a. The rollers 201b are symmetrically arranged on both sides of the transmission belt 201c, and a transmission shaft 201b-1 is provided between the rollers 201b on both sides.

[0034] The drive shaft 201b-1 rotates through the interior of the folding plate 202. The outer wall of the folding plate 202 is provided with an array of brush plates 202a. The end face of the folding plate 202 is provided with a rotating column 202b. Each folding plate 202 is rotatably connected to the other through the rotating column 202b.

[0035] Furthermore, the drive shaft 201b-1 is in contact with the drive belt 201c, and the drive shaft 201b-1 can move under the action of the drive belt 201c, so that the roller 201b connected to the drive shaft 201b-1 slides along the slide groove 201a. The drive belt 201c is driven by a motor, and the motor is electrically connected to the lifting block 105. Each time the lifting block 105 rises, the drive belt 201c rotates clockwise.

[0036] Preferably, the frame 201 is fitted to the upper surface of the bucket body 104, and the drive shaft 201b-1 is rotatably positioned at the midpoint of the side of each folding plate 202. The folding plates 202 are connected by hinges. After the folding plates 202 are retracted and stacked, they fit together, thereby reducing the volume occupied in the bucket body 104. After the folding plates 202 are retracted, it is also easier for the operator to observe the amount of coal that has been grabbed in the bucket body 104.

[0037] In summary, during use, the operator first lowers the lifting block 105, and the two symmetrically arranged buckets 104 rotate and separate from each other. At this time, the folding plate 202 is in a retracted state, which makes it convenient for the operator to observe the amount of coal that has been grabbed in the bucket 104. After the grabbing is completed, the lifting block 105 is driven to rise, so that the two buckets 104 rotate and fit together to seal the coal in the bucket 104.

[0038] Subsequently, the drive belt 201c starts, causing the drive shaft 201b-1, which is in contact with it, to slide together. This causes the rollers 201b at both ends of the drive shaft 201b-1 to slide along the groove 201a, thereby moving all the folding plates 202 together. Since the folding plates 202 are rotatably connected, they will rotate and unfold during this process, gradually covering the upper end of the bucket body 104 and forming a closed space with the bucket body 104. This seals and isolates the coal dust inside the bucket body 104, reducing the possibility of coal dust entering the rotating shaft 103 and blocking the flow of lubricating oil or hindering the interior of the rotating shaft 103. It also prevents some coal dust from entering the construction environment and causing dust pollution. At the same time, the brush plate 202a located on the side wall of the folding plate 202 can clean the coal dust adhering to the side wall of the bucket body 104 while the folding plate 202 rotates, preventing a large amount of coal dust from adhering and accumulating, which would reduce the capacity of the grab bucket 104 and affect work efficiency. It also reduces the time required for manual cleaning and improves work efficiency.

[0039] Example 2

[0040] Reference Figures 1-5 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, except that the inner walls of the transmission belt 201c are respectively provided with a rotating wheel 201c-1 and a guide wheel 201c-2. The end of the push rod 304 away from the dust cover 302 is provided with a transmission gear 304c. The rotating wheel 201c-1 is inserted through the transmission gear 304c. The automatic closing of the folding plate 202 is achieved by the relative rotation of the bucket body 104 and the support rod 102. At the same time, the dust cover 302 further prevents coal and mud from entering the interior of the rotating shaft 103.

[0041] Specifically, the outer wall of the drive shaft 201b-1 is provided with drive teeth 201b-2, and the drive shaft 201b-1 is engaged with the inner wall of the drive belt 201c through the drive teeth 201b-2; the two ends of the inner wall of the drive belt 201c are respectively provided with a rotating wheel 201c-1 and a guide wheel 201c-2, and the rotating wheel 201c-1 and the guide wheel 201c-2 simultaneously engage with the inner wall of the drive belt 201c, and the groove 201a is wider as it gets closer to the rotating wheel 201c-1.

[0042] Among them, the outer wall of the drive shaft 201b-1 has a circumferential array of drive teeth 201b-2, which makes the drive shaft 201b-1 move more smoothly when the drive belt 201c drives the drive shaft 201b-1 through the drive teeth 201b-2, and makes the process of each folding plate 202 shrinking and unfolding more smoothly, thus improving the unfolding and shrinking efficiency.

[0043] Furthermore, when the drive shaft 201b-1 is working normally, it will move together with the drive belt 201c. After the folding plate 202 retracts and expands to its maximum value, the drive shaft 201b-1 will be limited by the folding plate 202 and unable to move. As a result, the drive shaft 201b-1 will spin freely and thus be fixed in place. Due to the change in the width of the groove 201a, the roller 201b connected to the drive shaft 201b-1 will also spin freely.

[0044] Preferably, a cylinder 302a is rotatably sleeved on the outer wall of the dust cover 302, the cylinder 302a is connected to the outer wall of the support rod 102, and the oil hole 301 is located inside the dust cover 302; a transmission gear 304c is provided at the end of the push rod 304 away from the dust cover 302, and the rotating wheel 201c-1 is provided through the inside of the transmission gear 304c.

[0045] Furthermore, the rotating shaft 103 is slidably sleeved with the support rod 102, and the rotating shaft 103 and the support rod 102 can rotate coaxially through a flat key. The support rod 102 rotates through the dust cover 302 and is connected to the transmission gear 304c.

[0046] The dust cover 302 is fixedly installed on the outer wall of the bucket body 104, and the dust cover 302 rotates concentrically with the rotating shaft 103, so that the dust cover 302 can rotate together with the bucket body 104. The gear ratio is adjusted by the transmission gear 304c, so that when the dust cover 302 rotates, the rotating wheel 201c-1 also rotates, thereby driving the transmission belt 201c to rotate.

[0047] In summary, during use, whenever the bucket 104 finishes grabbing coal, the lifting block 105 drives the bucket 104 to rotate, and the rotating shaft 103 rotates relative to the bucket 104. This causes the support rod 102 connected to the rotating shaft 103 to rotate, driving the transmission gear 304c to rotate and transmitting power to the rotating wheel 201c-1, which in turn drives the transmission belt 201c to rotate. Thus, during each opening and closing of the bucket 104, the transmission belt 201c will automatically rotate in both directions, achieving automatic rotation of the folding plate 202.

[0048] Example 3

[0049] Reference Figures 1-7 This is the third embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the automatic oiling and lubrication of the rotating shaft 103 can be achieved through the process of the bucket body 104 and the support rod 102 rotating and opening, saving downtime for oiling and improving work efficiency.

[0050] Specifically, the inner wall of the cylinder 302a is provided with internal threads, the push rod 304 slides through the dust cover 302, the outer wall of the dust cover 302 is provided with air holes 302b, the outer wall of the push rod 304 is provided with a disc 304a, the outer wall of the disc 304a is provided with external threads, and the disc 304a is screwed into the inner wall of the cylinder 302a through the threads.

[0051] The outer wall of the dust cover 302 is rotatably fitted with a cylinder 302a, which is connected to the outer wall of the support rod 102. The oil hole 301 is located inside the dust cover 302. The rotating shaft 103 passes through the push rod 304 through the cylindrical shaft and is directly connected to the transmission gear 304c, driving the transmission gear 304c to rotate.

[0052] Furthermore, the cylinder 302a is rotatably mounted on the outer wall of the support rod 102 via a bearing seat, and the cylinder 302a is coaxial with the rotating shaft 103. The cylinder 302a is also rotatably mounted on the outer wall of the dust cover 302, and the disc 304a is slidably mounted on the outer wall of the push rod 304. The push rod 304 and the dust cover 302 can slide relative to each other but cannot rotate relative to each other.

[0053] Preferably, the outer wall of the push rod 304 is also rotatably fitted with a platform 305. The end face of the platform 305 is provided with a ratchet 305a. The push rod 304 rotatably passes through the end face of the platform 305, and the outer wall of the push rod 304 is rotatably provided with a turntable 305b. The outer wall of the turntable 305b is provided with an array of pawls 305c. A first elastic element 305d is provided between the pawls 305c and the turntable 305b. The platform 305 is fixedly mounted on the end face of the cylinder 302a.

[0054] The first elastic element 305d is a spring. The platform 305, the cylinder 302a, and the dust cover 302 form a closed inner cavity. The lubricating oil 303 is located inside the closed inner cavity. The dust cover 302 is fitted outside the oil hole 301. When the disc 304a slides down along the push rod 304, it pressurizes the lubricating oil 303 inside the closed cavity, thereby injecting hydraulic oil into the oil hole 301 to complete the oil injection.

[0055] Preferably, the pawl 305c is rotatably mounted on the outer wall of the turntable 305b, and the first elastic element 305d pushes the pawl 305c to rotate, causing the ratchet 305a and the pawl 305c to engage with each other, so that the turntable 305b can only rotate in one direction.

[0056] In summary, during use, when the bucket body 104 and the support rod 102 rotate relative to each other, the rotating shaft 103 will also rotate relative to the bucket body 104. Taking the support rod 102 as a reference, when the bucket body 104 rotates clockwise, the dust cover 302 connected to the bucket body 104 also rotates clockwise. At the same time, the cylindrical shaft drives the transmission gear 304c to rotate, thereby cleaning the coal ash on the inner wall of the bucket body 104 and opening the folding plate 202 to facilitate observation of the amount of coal grabbed inside the bucket body 104.

[0057] At the same time, the push rod 304 connected to the dust cover 302 will also rotate, driving the turntable 305b to rotate. Since the pawl 305c and ratchet 305a are engaged at this time, the platform 305 connected to the ratchet 305a will rotate, and the cylinder 302a connected to the platform 305 will rotate together with it. When the grab bucket body 104 and the support rod 102 rotate counterclockwise, the pawl 305c and ratchet 305a cannot be engaged at this time, and the cylinder 302a and the platform 305 cannot rotate together, so they rotate relative to each other. As a result, the cylinder 302a and the disc 304a inside it rotate relative to each other. The disc 304a rotates along the thread direction and moves downward along the push rod 304, pressurizing and pushing the lubricating oil 303 in the closed cavity into the oil hole 301, thereby completing the oil injection. The existence of the dust cover 302 not only prevents coal and mud from entering the oil hole 301, but also realizes the automatic oil injection of the rotating shaft 103.

[0058] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0059] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0060] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatically lubricated coal grab bucket, characterized in that: include, The gripping mechanism (100) includes a hanging plate (101), a support rod (102) rotatably disposed on the end face of the hanging plate (101), a rotating shaft (103) disposed within the support rod (102), a bucket (104) rotatably sleeved on the outer wall of the rotating shaft (103), and a lifting block (105) rotatably disposed on the end face of the bucket (104); and, The sealing mechanism (200) includes a frame (201) disposed on the end face of the bucket (104), a folding plate (202) slidably disposed inside the frame (201), and a cleaning brush (203) disposed on the end face of the folding plate (202); and, The frame (201) has grooves (201a) on both sides, and rollers (201b) are slidably arranged in the grooves (201a). A transmission belt (201c) is also provided in the grooves (201a). The rollers (201b) are symmetrically arranged on both sides of the transmission belt (201c), and a transmission shaft (201b-1) is provided between the rollers (201b) on both sides. The lubrication mechanism (300) includes an oil hole (301) provided on the end face of the rotating shaft (103), a dust cover (302) rotatably provided on the end face of the bucket body (104), lubricating oil (303) provided in the dust cover (302), and a push rod (304) slidably provided on the inner wall of the dust cover (302). The outer wall of the dust cover (302) is rotatably fitted with a cylinder (302a), the cylinder (302a) is connected to the outer wall of the support rod (102), and the oil hole (301) is located inside the dust cover (302); The inner wall of the cylinder (302a) is provided with internal threads, the push rod (304) slides through the dust cover (302), and the outer wall of the dust cover (302) is provided with air holes (302b). The push rod (304) has a disc (304a) on its outer wall, and the disc (304a) has an external thread on its outer wall. The disc (304a) is screwed into the inner wall of the cylinder (302a) through the thread. The push rod (304) is also rotatably fitted with a platform (305) on its outer wall. The end face of the platform (305) is provided with a ratchet (305a). The push rod (304) rotatably passes through the end face of the platform (305), and a turntable (305b) is rotatably provided on the outer wall of the push rod (304). The outer wall of the turntable (305b) is provided with an array of pawls (305c). A first elastic element (305a) is provided between the pawls (305c) and the turntable (305b). 5d), the platform (305) is fixedly mounted on the end face of the cylinder (302a); the push rod (304) is provided with a transmission gear (304c) at the end away from the dust cover (302), the rotating shaft (103) is slidably sleeved with the support rod (102), the rotating shaft (103) and the support rod (102) rotate coaxially through a flat key, and the support rod (102) rotates through the dust cover (302) and is connected to the transmission gear (304c).

2. The automatically lubricated coal grab bucket as described in claim 1, characterized in that: The outer wall of the drive shaft (201b-1) is provided with drive teeth (201b-2), and the drive shaft (201b-1) is engaged with the inner wall of the drive belt (201c) through the drive teeth (201b-2).

3. The automatically lubricated coal grab bucket as described in claim 2, characterized in that: The drive shaft (201b-1) rotates through the interior of the folding plate (202). The outer wall of the folding plate (202) is provided with brush plates (202a), and the end face of the folding plate (202) is provided with a rotating column (202b). Each of the folding plates (202) is rotatably connected to each other through the rotating column (202b).

4. The automatically lubricated coal grab bucket as described in claim 3, characterized in that: The inner walls of the transmission belt (201c) are respectively provided with a rotating wheel (201c-1) and a guide wheel (201c-2) at both ends. The rotating wheel (201c-1) and the guide wheel (201c-2) simultaneously mesh with the inner walls of the transmission belt (201c). The groove (201a) is wider as it gets closer to the rotating wheel (201c-1).

5. The automatically lubricated coal grab bucket as described in claim 4, characterized in that: The rotating wheel (201c-1) is disposed inside the transmission gear (304c).

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