Tensioning gear motor for grab ship unloader

Abstract

The utility model provides a tensioning gear motor for a grab ship unloader, which relates to the technical field of harbor machinery and comprises an outer shell, a threaded sleeve, a bearing, a first bevel gear, a second bevel gear, a motor, a connecting fork and a shaft, the output end of the motor is fixedly connected with the second bevel gear, and the first bevel gear is sleeved and fixedly connected outside the threaded sleeve. Two bearings are fixedly installed on the outer shell, the threaded sleeve is rotationally connected with the outer shell through the two bearings, the two sides of the threaded sleeve are in threaded connection with the two external thread lead screws, and the two external thread lead screws move towards each other or away from each other and are hinged to a ship unloader sill beam and a mooring seat respectively; a plurality of unthreaded holes are formed in the threaded sleeve; supporting lug plates are arranged on the two sides of the outer shell and connected with a connecting fork through bolts, and the connecting fork is hinged to a support of the ship unloader through a shaft. According to the utility model, the power of the motor is transmitted to the thread bushing through gear transmission, so that the two external thread screw rods move towards each other or away from each other, and the tensioning or loosening of the windproof mooring device is realized.

Description

A tensioning geared motor for a grab unloader Technical Field

[0001] This utility model relates to the field of port machinery technology, and in particular to a tensioning reduction motor for a grab unloader. Background Technology

[0002] Ship unloaders are large-scale bulk material handling equipment used in open-air operations near the sea. Due to their large size and wide windward area, wind protection devices are essential considerations in the design and use of ship unloaders to effectively prevent damage from various wind forces and ensure safe operation. Wind protection devices for ship unloaders are categorized into static wind protection devices, dynamic wind protection devices, and wind alarm systems, based on both dynamic and static principles. Static wind protection devices include: wind-resistant mooring lines to prevent overturning, anchoring devices to prevent slippage, wheel stops at both ends of the track to prevent derailment, and rail clamps to prevent slippage. Dynamic wind protection devices include: wheel clamps to prevent slippage and brakes for the trolley drive.

[0003] The anti-tipping mooring line, or anti-overturning device, in the static windproof device on the ship unloader is used during strong typhoons or very strong winds to increase the safety and stability of the ship unloader. An anti-tipping device is installed at each outrigger of the ship unloader's trolley traveling mechanism. This device is in the form of a trapezoidal screw rod and is interlocked with the ship unloader's trolley traveling mechanism. Originally, a single trapezoidal internal threaded sleeve was used to connect to the trapezoidal external threaded screw on the device. This required manual rotation of the threaded sleeve to control the tension of the windproof device, which was inefficient and resulted in unstable power transmission. Summary of the Invention

[0004] To address the aforementioned technical problems, a tensioning reduction motor for a grab unloader is provided. This invention primarily works by starting the motor, which drives the second helical gear to rotate. The second and first helical gears mesh and transmit power through a gear pair reduction transmission, causing the threaded sleeve to rotate. This, in turn, drives two external threaded screws to move towards or away from each other, thus achieving the tensioning or loosening of the windproof mooring device. The technical means employed in this invention are as follows:

[0005] A tensioning reduction motor for a grab bucket ship unloader includes: a housing, a threaded sleeve, bearings, a first helical gear, a second helical gear, a motor, a connecting fork, and a shaft. The first and second helical gears are both housed inside the housing. The motor is fixedly mounted on one side of the housing. The output end of the motor is fixedly connected to the second helical gear, which meshes with the first helical gear. The first helical gear is sleeved and fixedly connected to the outer wall of the threaded sleeve, which penetrates the housing. Two coaxially arranged bearings are fixedly mounted on the housing. The outer wall of the threaded sleeve is rotatably connected to the outer casing via two bearings. The inner sides of the threaded sleeve are threadedly connected to two external threaded screws, which can move towards or away from each other. The inner wall of the threaded sleeve has trapezoidal internal threads with opposite directions of rotation on both sides. The outer walls of the two external threaded screws with adjacent ends are both provided with trapezoidal external threads. The trapezoidal internal threads on both sides of the threaded sleeve are threadedly connected to the trapezoidal external threads of the two external threaded screws. The other ends of the two external threaded screws that are far apart are hinged to the unloader's sill beam and the mooring seat, respectively.

[0006] The threaded sleeve has a plurality of light holes evenly distributed along the circumferential direction in the middle part, and the light holes are located outside the outer shell;

[0007] The outer wall of the outer shell is provided with support lugs on both sides. Each support lug is fixedly connected to the connecting fork by bolts. The connecting forks on both sides are respectively hinged to the support of the unloader by shafts.

[0008] Furthermore, the outer casing includes an upper cover and a lower base, which are fixedly connected by multiple sets of first bolts and first washers. The two bearings are respectively fixedly installed on the upper cover and the lower base, and the motor is fixedly installed on the lower base and located below the lower base.

[0009] Furthermore, through covers are fixedly installed at the positions of the two bearings on the upper cover and the lower base. One through cover is fixedly connected to the upper cover by multiple sets of second bolts and second washers, and the other through cover is fixedly connected to the lower base by multiple sets of second bolts and second washers.

[0010] Furthermore, both of the transparent covers are provided with sealing rings.

[0011] Furthermore, spacers are provided between the two bearings and the two end faces of the first helical gear.

[0012] Furthermore, the first helical gear and the threaded sleeve are connected by a key.

[0013] Furthermore, the second helical gear is fixedly mounted on the motor shaft end by a third bolt, a retaining washer, and a shaft end retaining ring.

[0014] Furthermore, the threaded sleeve is provided with a glycerin nozzle.

[0015] Furthermore, a viewing cover is fixedly installed on the upper cover by multiple sets of bolts, and a viewing gasket is provided between the viewing cover and the upper cover.

[0016] Furthermore, an air filter is fixedly installed on the viewing cover.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The tensioning reduction motor for the grab unloader provided by this utility model is a compact three-in-one transmission device that integrates the motor, reducer and brake into one unit. It is installed vertically and has the feature of parallel output with the motor shaft, which can efficiently transmit power and realize real-time motion control.

[0019] 2. The tensioning reduction motor for the grab unloader provided by this utility model integrates the motor and reducer into one unit, reducing space occupation, simplifying installation steps, and lowering costs. The gears are made of high-quality alloy steel and are carburized, quenched, and ground, resulting in high tooth surface hardness and precision, ensuring smooth operation and low transmission noise.

[0020] 3. The tensioning reduction motor for the grab unloader provided by this utility model has a compact structure, small size, and light weight. Its core function is to reduce speed and increase torque. It uses gear transmission to transmit the motor power to the threaded sleeve, so that the two external threaded screws at the connecting end can move simultaneously (moving towards or away from each other). It can realize the tensioning or relaxation of the windproof mooring device in real time, and use the motor brake to achieve precise braking.

[0021] 4. The tensioning reduction motor for the grab unloader provided by this utility model replaces manual operation, solving the problem of tensioning or loosening the original manual windproof mooring device. It also allows for real-time motor-driven control, improving safety. Furthermore, the threaded sleeve has four evenly distributed holes in the center. When the tensioning reduction motor malfunctions, the threaded sleeve can be manually rotated using a handle to achieve tensioning or loosening, providing double assurance for the safe operation of the unloader.

[0022] Based on the above reasons, this utility model can be widely promoted in the field of port machinery such as grab unloaders. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a front view of a tensioning reduction motor for a grab unloader according to this utility model.

[0025] Figure 2 is a left view of a tensioning reduction motor for a grab bucket unloader according to this utility model.

[0026] Figure 3 is a top view of a tensioning reduction motor for a grab bucket unloader according to this utility model.

[0027] In the diagram: 1. First bolt; 2. First washer; 3. Upper cover; 4. Through cover; 5. Second bolt; 6. Second washer; 7. Threaded sleeve; 8. Sealing ring; 9. Bearing; 10. Spacer; 11. First helical gear; 12. Key; 13. Third bolt; 14. Locking washer; 15. Shaft end retaining ring; 16. Second helical gear; 17. Lower base; 18. Glycerin nozzle; 19. Motor; 20. Sight hole cover; 21. Sight hole gasket; 22. Air filter; 23. Connecting fork; 24. Shaft. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] Example 1

[0030] This utility model provides a tensioning reduction motor for a grab bucket unloader, namely an automatic tensioning reduction motor, which replaces the original single manual operation (manually rotating the threaded sleeve) to achieve speed reduction and torque increase. At the same time, the motor drive can adjust the up and down movement of the two external threaded screws at the connecting end in real time, so as to make the windproof mooring device stable.

[0031] This utility model discloses a tensioning reduction motor for a grab bucket unloader, comprising: a housing, a threaded sleeve 7, bearings 9, a first helical gear 11, a second helical gear 16, a motor 19, a connecting fork 23, and a shaft 24. The first helical gear 11 and the second helical gear 16 are both located inside the housing. The motor 19 is fixedly installed on one side of the housing, and its output end is fixedly connected to the second helical gear 16. The second helical gear 16 meshes with the first helical gear 11 for transmission. The first helical gear 11 is sleeved and fixedly connected to the outer wall of the threaded sleeve 7, which penetrates the housing. Two coaxially arranged bearings 9 are fixedly installed on the housing, and the outer wall of the threaded sleeve 7 is rotatably connected to the housing via the two bearings 9. The inner sides of the threaded sleeve 7 are threadedly connected to two external threaded screws, which can move towards or away from each other. The inner walls of the threaded sleeve 7 are provided with trapezoidal internal threads with opposite directions of rotation. The outer walls of the two external threaded screws are provided with trapezoidal external threads at their closest ends. The trapezoidal internal threads on both sides of the threaded sleeve 7 are threadedly connected to the trapezoidal external threads of the two external threaded screws, respectively. The other ends of the two external threaded screws are hinged to the unloader's sill beam (existing equipment) and the mooring seat (existing equipment), respectively. The threaded sleeve 7 has high transmission efficiency, good centering, and the internal and external threads can fit tightly together, resulting in smooth operation and reducing the risk of deviation. The trapezoidal thread structure can distribute stress, and the thread root has high strength and is not easy to break.

[0032] The threaded sleeve 7 has multiple light holes evenly distributed along the circumference in the middle, and the light holes are located on the outside of the outer shell; the outer walls of the outer shell are provided with support ear plates on both sides, each support ear plate is fixedly connected to the connecting fork 23 by bolts, and the two connecting forks 23 are respectively hinged to the support of the unloader by the shaft 24.

[0033] The tensioning geared motor of this utility model is a vertically installed single-input single-output parallel shaft structure (single-stage parallel shaft structure). Based on the load and operating conditions, the axial and radial loads that the second helical gear 16 at the input end needs to bear are calculated, and a motor that meets the load-bearing capacity is selected. After the motor is determined, the second helical gear 16 at the input end is connected to the shaft end of the motor 19. The second helical gear 16 is fixedly installed on the shaft end of the motor 19 through the shaft end retaining ring 15, the third bolt 13, and the locking washer 14. When the motor 19 is started, the motor 19 drives the second helical gear 16 to rotate. The second helical gear 16 and the first helical gear 11 mesh and transmit power, and then the first helical gear 11 reduces the speed (through the gear pair speed reduction transmission), causing the threaded sleeve 7 to rotate, thereby driving the two external threaded screws to move simultaneously. The two external threaded screws move towards each other or away from each other, realizing the tensioning or relaxation state of the windproof mooring device.

[0034] This invention relates to port machinery and is a tensioning reduction motor that prevents the entire machine from tipping over. It replaces manual operation, solving the problem of tensioning or loosening the original manual windproof mooring device. Real-time motor-driven control improves safety. Furthermore, the threaded sleeve has multiple evenly distributed holes in its center. If the tensioning reduction motor malfunctions, the threaded sleeve can be manually rotated using a handle to tension or loosen it, providing double protection for the safe operation of the ship unloader.

[0035] Example 2

[0036] The tensioning reduction motor for a grab unloader of this utility model is mainly composed of a first bolt 1, a first washer 2, an upper cover 3, a through cover 4, a second bolt 5, a second washer 6, a threaded sleeve 7, a sealing ring 8, a bearing 9, a spacer 10, a first helical gear 11, a key 12, a third bolt 13, a stop washer 14, a shaft end retaining ring 15, a second helical gear 16, a lower base 17, a glycerin nozzle 18, a motor 19, a sight glass cover 20, a sight glass gasket 21, an air filter 22, a connecting fork 23, and a shaft 24.

[0037] The outer casing consists of two parts: an upper cover 3 and a lower base 17. Positioning pins are used to position the upper cover 3 and the lower base 17, facilitating machining and improving machining accuracy. The upper cover 3 and the lower base 17 are fixedly connected around their edges by multiple sets of first bolts 1 and first washers 2. The first washers 2 are positioned between the first bolts 1 and the upper surface of the upper cover 3. The upper cover 3 can be a flat structure, while the lower base 17 can be a U-shaped, open-top box structure. The positioning pins are used during the machining stage to improve machining accuracy, while the first bolts 1 and first washers 2 are used after machining to secure the upper cover 3 and the lower base 17.

[0038] The first helical gear 11 and the second helical gear 16 are arranged left and right inside the outer casing. The first helical gear 11 and the second helical gear 16 can be made of high-quality alloy steel (existing materials). After carburizing, quenching and grinding, the tooth surface has high hardness and precision, which makes the operation smooth and the transmission noise low.

[0039] The motor 19 is fixedly mounted on the lower base 17 by multiple sets of bolts and is located below the lower base 17 (the mounting method of the motor 19 is prior art). In addition, since the motor 19 is located outside the housing and exposed to the outdoors, a protective cover can be added to the outside of the motor 19 according to the requirements of the working environment. The protective cover is a shell structure that surrounds the motor 19 and can prevent dust and water. The protective cover can adopt the existing structure of a protective cover with ventilation holes (prior art) without affecting the heat dissipation effect of the motor 19 or the operation of the motor 19. The output shaft of the motor 19 is located at the top and inserted into the interior of the lower base 17. The output shaft of motor 19 is fixedly connected to the second helical gear 16. The second helical gear 16 is fixedly installed on the shaft end of motor 19 by a shaft end retaining ring 15, a third bolt 13, and a locking washer 14. The inner wall of the second helical gear 16 is connected to the outer wall of the shaft end of motor 19 by a key. First, the second helical gear 16 is fixedly connected to the outer wall of the shaft end of motor 19 by a key. Then, on the upper end face of the shaft end of motor 19, the shaft end retaining ring 15 is fixed to the shaft end of motor 19 by the third bolt 13 (the shaft end retaining ring 15 is essentially attached to the upper end face of motor 19). On the upper end face of the shaft end), the second helical gear 16 is axially positioned, and then a retaining washer 14 (similar to a gasket) is set between the shaft end retaining ring 15 and the third bolt 13 to prevent the third bolt 13 from loosening (preventing the bolt from loosening under vibration); the corresponding model of retaining washer 14 can be selected according to the diameter of the third bolt 13, and the connection between the retaining washer 14 and the third bolt 13 adopts the existing connection method (for example, the ear structure of the retaining washer 14 can be used to embed into the groove of the third bolt 13 to form a physical block). The second helical gear 16 meshes with the first helical gear 11 for transmission (the speed ratio of the first helical gear 11 and the second helical gear 16 is in the range of 1~6.3, realizing the function of reducing speed and increasing torque). The first helical gear 11 is fixedly connected to the outer wall of the threaded sleeve 7 by a key 12. The inner wall of the first helical gear 11 and the outer wall of the threaded sleeve 7 are connected by a key 12. The threaded sleeve 7 passes through the outer shell (the upper and lower ends of the threaded sleeve 7 pass through the upper cover 3 and the lower base 17, respectively). Two coaxially arranged bearings 9 are fixedly installed on the outer shell. The two bearings 9 are fixedly installed on the upper cover 3 and the lower base 17, respectively. On the base 17, two coaxial through holes can be opened on the upper cover 3 and the lower base 17. Two bearings 9 are installed in the two through holes respectively. The outer rings of the two bearings 9 are fixedly connected to the inner walls of the two through holes. The outer wall of the threaded sleeve 7 is rotatably connected to the outer shell through the two bearings 9. The outer wall of the threaded sleeve 7 is fixedly connected to the inner rings of the two bearings 9. Spacers 10 are provided between the two bearings 9 and the two end faces of the first helical gear 11. That is, spacers 10 are provided between the upper bearing 9 and the upper end face of the first helical gear 11, and spacers 10 are provided between the lower bearing 9 and the lower end face of the first helical gear 11, which serves as a positioning function.Meanwhile, corresponding to the positions of the two bearings 9 on the upper cover 3 and the lower base 17, i.e., the outer sides of the two through holes, are fixedly installed with through covers 4. The four edges of the upper through cover 4 are fixedly connected to the upper cover 3 by multiple sets of second bolts 5 and second washers 6, and the second washers 6 are placed between the upper surface of the upper through cover 4 and the second bolts 5; the four edges of the lower through cover 4 are fixedly connected to the lower base 17 by multiple sets of second bolts 5 and second washers 6, and the second washers 6 are placed between the lower surface of the lower through cover 4 and the second bolts 5; the two through covers 4 enclose the two bearings 9 inside the housing. Both bearings 9 are deep groove ball bearings, installed at the upper and lower ends, fixing and enabling the rotation of the threaded sleeve 7. While meeting the load-bearing capacity, the bearing 9 has a simple structure, light weight, low operating noise, and is easy to install and maintain. Sealing rings 8 are installed at four locations on both the upper and lower covers to prevent dust and seal the output shaft end of the tensioning geared motor. The sealing rings 8 are installed in the gap between the inner wall of the two covers 4 and the outer wall of the threaded sleeve 7 (the sealing rings 8 and bearings 9 are not in contact), achieving an overall seal of the outer casing, thus preventing dust and sealing the output shaft end of the tensioning geared motor. The first bolt 1, first washer 2, second bolt 5, second washer 6, third bolt 13, and locking washer 14 are all fasteners that secure the connection between the covers 4 and the upper cover 3 of the tensioning geared motor and the lower base 17.

[0040] The threaded sleeve 7 has two threaded connections on its inner sides to two external threaded rods. These two external threaded rods can move towards or away from each other. The inner wall of the threaded sleeve 7 has trapezoidal internal threads with opposite directions of rotation on both sides. The outer walls of the two external threaded rods at their closest ends also have trapezoidal external threads. The trapezoidal internal threads on both sides of the threaded sleeve 7 are threaded to the trapezoidal external threads of the two external threaded rods. The threaded sleeve 7 can be a cylindrical structure, and the external threaded rods can adopt existing structural forms (one side is a rod with external threads, and the other side is a structure with a connecting hole). The two external threaded screws are hinged at opposite ends to the unloader's sill beam and mooring seat (a pin can be used for hinge). The connection between the two external threaded screws and the unloader's sill beam and mooring seat can be the same as the existing connection method used in manual operation. The central axis of the threaded sleeve 7 is parallel to the axis of the output shaft of the motor 19. The outer wall of the middle part of the threaded sleeve 7 has four light holes evenly distributed in the circumferential direction. The light holes are located outside the outer shell and below the lower base 17.

[0041] The outer wall of the outer casing is provided with support lugs on both sides. Each support lug is connected to the connecting fork 23 by bolts. The connecting forks 23 on both sides are respectively hinged to the support of the ship unloader (which is fixedly connected to the ship unloader and can adopt the existing support structure) through shaft 24. The shaft 24 can be a pin. When the tensioning reduction motor tensions or relaxes, the two external threaded screws will rotate around the hinge point at the ship unloader sill beam and mooring seat. Under the action of the hinge connection at the shaft 24, the outer casing can move slightly with the tensioning reduction motor, moving up and down slightly along the axial direction of the external threaded screws.

[0042] The threaded sleeve 7 is equipped with a glycerin nozzle 18, a standard part with an existing structure (having an opening and closing function). It can be screwed into the threaded hole on the threaded sleeve 7 via a threaded connection for glycerin grease lubrication of the threads between the threaded sleeve 7 and the external threaded screw. Accordingly, by opening and closing the glycerin nozzle 18, glycerin grease is introduced when lubrication is needed; it is closed when lubrication is not needed. The tensioning geared motor uses glycerin grease lubrication, as do the first helical gear 11, the second helical gear 16, and the bearing 9 (glycerin grease can be applied before assembly). Glycerin grease lubrication forms a lubricating film, reducing friction and wear, improving the operating efficiency of the tensioning geared motor, extending its service life, and preventing oil leakage.

[0043] A sight glass cover 20 is fixedly installed on the upper cover 3 by multiple sets of bolts, and a sight glass gasket 21 is provided between the sight glass cover 20 and the upper cover 3. An air filter 22 is fixedly installed on the sight glass cover 20. The meshing operation of the gear pair of the tensioning gear motor can be well observed through the sight glass cover 20, and the air filter 22 filters impurities, realizing clean air exchange for the tensioning gear motor.

[0044] This utility model relates to a tensioning reduction motor used for anti-overturning on a bridge grab unloader in port machinery. The supporting lugs on both sides of the outer casing of the tensioning reduction motor are connected to the connecting fork 23 by bolts. The connecting fork 23 is connected to the bracket on the unloader via a shaft 24, thereby fixing the tensioning reduction motor. The tensioning reduction motor is installed vertically, and its input gear (second helical gear 16) is installed on the shaft end of the motor 19. The motor 19 is installed on the outer casing. This is a compact three-in-one transmission device integrating the motor, reducer, and brake (the reducer here includes components other than the motor 19, connecting fork 23, and shaft 24, namely, the first bolt 1, the first washer 2, the upper cover 3, the through cover 4, the second bolt 5, and the second washer). 6. Threaded sleeve 7, sealing ring 8, bearing 9, spacer 10, first helical gear 11, key 12, third bolt 13, retaining washer 14, shaft end retaining ring 15, second helical gear 16, lower base 17, glycerin nozzle 18, sight glass cover 20, sight glass gasket 21, air filter 22; the brake is an existing device built into the motor itself). The output low-speed shaft is the threaded sleeve 7, whose internal threads at both ends have different directions of rotation, connecting to the upper and lower external threaded screws respectively. When the motor 19 is started, it drives the output low-speed shaft to rotate through the intermediate helical gear transmission, causing the two external threaded screws at the connecting end to move towards or away from each other. The threaded sleeve 7 is tensioned by rotating counterclockwise and relaxed by rotating clockwise. In addition, the threaded sleeve 7 has four evenly distributed light holes in the middle. If the tensioning reduction motor fails (such as the motor 19 failing to run), the threaded sleeve 7 can still be manually rotated by the handle to achieve tensioning or relaxation, doubly ensuring the safe operation of the ship unloader. The aperture can be a round hole, and the handle can be a round rod. The round rod can be inserted into a round hole, and the threaded sleeve 7 can be rotated by holding the round rod.

[0045] This utility model discloses a tensioning reduction motor for a grab bucket ship unloader, featuring a stable operating installation structure. It is designed as a single-input, single-output motor. The input end of the tensioning reduction motor operates via a drive motor, and the output speed is reduced through intermediate helical gear transmission. The output is a threaded sleeve connected to two external threaded screws. Rotation of the threaded sleeve drives the two external threaded screws to move towards or away from each other. Counterclockwise rotation causes both external threaded screws to move inward simultaneously (towards each other), achieving a tensioned state; clockwise rotation causes both external threaded screws to move outward simultaneously (away from each other), achieving a relaxed state. This ensures balance and solves the problem of manually rotating the threaded sleeve to tension the windproof mooring line, enabling stable equipment operation and safe operation. Simultaneously, the motor drive enables real-time control of the device's balance, improving work efficiency.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tensioning geared motor for a grab bucket ship unloader, characterized in that, include: The assembly comprises an outer casing, a threaded sleeve (7), bearings (9), a first helical gear (11), a second helical gear (16), a motor (19), a connecting fork (23), and a shaft (24). The first helical gear (11) and the second helical gear (16) are both located inside the outer casing. The motor (19) is fixedly installed on one side of the outer casing. The output end of the motor (19) is fixedly connected to the second helical gear (16). The second helical gear (16) meshes with the first helical gear (11) for transmission. The first helical gear (11) is sleeved and fixedly connected to the outer wall of the threaded sleeve (7). The threaded sleeve (7) penetrates the outer casing. Two coaxially arranged bearings (9) are fixedly installed on the outer casing. The outer wall of the threaded sleeve (7) is rotatably connected to the outer casing via the two bearings (9). The inner sides of the threaded sleeve (7) are respectively... The threaded sleeve (7) is threaded to two external threaded screws, which move toward or away from each other. The inner wall of the threaded sleeve (7) is provided with trapezoidal internal threads with opposite directions of rotation on both sides. The outer wall of the two external threaded screws is provided with trapezoidal external threads at the close ends. The trapezoidal internal threads on both sides of the threaded sleeve (7) are threaded to the trapezoidal external threads of the two external threaded screws respectively. The other ends of the two external threaded screws are hinged to the unloader's sill beam and the mooring seat respectively. The threaded sleeve (7) has a plurality of light holes evenly distributed along the circumference in the middle. The light holes are located outside the outer shell. The outer wall of the outer shell is provided with support ear plates on both sides. Each support ear plate is fixedly connected to the connecting fork (23) by bolts. The connecting forks (23) on both sides are hinged to the unloader's bracket by shafts (24).

2. The tensioning reduction motor for the grab unloader according to claim 1, characterized in that, The outer casing includes an upper cover (3) and a lower base (17). The upper cover (3) and the lower base (17) are fixedly connected by multiple sets of first bolts (1) and first washers (2). The two bearings (9) are fixedly installed on the upper cover (3) and the lower base (17) respectively. The motor (19) is fixedly installed on the lower base (17) and located below the lower base (17).

3. The tensioning reduction motor for the grab unloader according to claim 2, characterized in that, The upper cover (3) and the lower base (17) are each fixedly installed with a cover (4) at the position corresponding to the two bearings (9). One cover (4) is fixedly connected to the upper cover (3) by multiple sets of second bolts (5) and second washers (6), and the other cover (4) is fixedly connected to the lower base (17) by multiple sets of second bolts (5) and second washers (6).

4. The tensioning reduction motor for the grab bucket unloader according to claim 3, characterized in that, Both of the two transparent covers (4) are provided with sealing rings (8).

5. The tensioning reduction motor for the grab unloader according to claim 1, characterized in that, Spacers (10) are provided between the two bearings (9) and the two end faces of the first helical gear (11).

6. The tensioning reduction motor for the grab unloader according to claim 1, characterized in that, The first helical gear (11) and the threaded sleeve (7) are connected by a key (12).

7. The tensioning reduction motor for the grab unloader according to claim 1, characterized in that, The second helical gear (16) is fixedly mounted on the end of the motor (19) shaft by the third bolt (13), the retaining washer (14) and the shaft end retaining ring (15).

8. The tensioning reduction motor for the grab unloader according to claim 1, characterized in that, The threaded sleeve (7) is provided with a glycerin nozzle (18).

9. The tensioning reduction motor for the grab unloader according to claim 2, characterized in that, A viewing cover (20) is fixedly installed on the upper cover (3) by multiple sets of bolts, and a viewing pad (21) is provided between the viewing cover (20) and the upper cover (3).

10. The tensioning reduction motor for the grab unloader according to claim 9, characterized in that, An air filter (22) is fixedly installed on the viewing cover (20).

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