An electrically controlled electric hoist for a crane

Abstract

The present invention belongs to the technical field of electric hoists, and discloses an electrically controlled electric hoist for cranes, including a drum, a reducer movably mounted on the left side of the drum, and a power device movably mounted on the right side of the drum. The present invention fixes a pressure plate on the lower surface of the reducer, the power device, and the brake, and evenly distributes and fixes compression springs on the lower surface of the pressure plate, and fixes an overweight signal sending column on the lower surface of the pressure plate and located at the inner ring of the compression spring, and fixes an overweight signal receiving sleeve on the lower surface of the inner cavity of the outer sleeve, so that when the steel rope hanging object on the drum is subjected to gravity, the pressure plate will first be pulled downward to compress the compression spring, and when the weight of the hanging object causes the bottom surface of the overweight signal sending column to contact and cooperate with the overweight signal receiving sleeve, that is, the weight of the hanging object exceeds the load of the power device, the hanging object needs to be deleted and repacked to prevent the power device from being frequently overloaded and to increase the service life of the power device.

Description

Technical Field

[0001] The invention belongs to the technical field of electric hoists, in particular to an electrically controlled electric hoist for a crane. Background Art

[0002] A crane is a device in which the worker controls the operating lever in the cab and uses electrical signals to control the operation of various parts. The electric hoist is one of its control devices. The electric hoist is a special lifting equipment installed on an overhead crane or gantry crane. The electric hoist has the characteristics of small size, light weight, simple operation and easy use. It is used in industrial and mining enterprises, warehouses, docks and other places. The electric hoist has a compact structure.

[0003] When using an electric hoist, the motor drives the drum to rotate, so that the rope wound on the rope groove of the drum is retracted and released to lift or release the object suspended by the rope. Usually, the objects that need to be suspended are hung on the hook by steel rope for transportation.

[0004] The electric hoist in the prior art is used in places such as construction sites. When transporting materials used in high-rise buildings, the steel rope in the electric hoist is wound on the outer surface of the drum in multiple layers, and the objects to be hung are bundled together, which makes it impossible to grasp the weight of the object to be hung, which may cause the power device of the electric hoist to be overloaded, causing the power device to be seriously loaded and thus overheated and damaged; at the same time, the steel rope on the drum is not wound tightly before the object is hung, which causes the steel rope to be overloaded when lifting the load, and the steel rope transferred to the drum is over-tightened, and the multiple layers of wound steel rope are in close contact with each other, resulting in excessive friction and easy damage. Summary of the invention

[0005] The object of the present invention is to provide an electrically controlled electric hoist for a crane to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electrically controlled electric hoist for a crane, comprising a drum, a reducer movably mounted on the left side of the drum, a power device movably mounted on the right side of the drum, a brake mounted on the right side bearing of the output shaft of the power device, an inner hole is opened inside the drum, a coupling is movably mounted in the middle of the inner hole, a rotating shaft is threadedly mounted on both the left and right ends of the coupling, the rotating shaft on the left side is movably mounted with the reducer, the rotating shaft on the right side passes through the power device and the brake movably mounted, the rotating shaft on the right side is fixedly mounted with the power device, a shell is fixedly mounted on the outer ring of one side of the reducer, and the drum is in the shell. A movable suit, wherein a steel rope is wound around the outer surface of the drum, a rope guide is slidably mounted on one side of the shell, a pressure plate is fixedly mounted on the lower surface of the reducer, power device and brake, a jacket is movably mounted on the outer surface of the pressure plate, a rope opening is provided on one side of the bottom surface of the jacket, and the jacket sets the drum, reducer, power device and brake inside thereof, an evenly distributed compression spring is fixedly mounted on the lower surface of the pressure plate, the lower end of the compression spring is fixedly mounted to the lower surface of the inner cavity of the jacket, an overweight signal sending column is fixedly mounted on the lower surface of the pressure plate, the overweight signal sending column is located on the inner ring of the compression spring, and an overweight signal receiving sleeve is fixedly mounted on the lower surface of the inner cavity of the jacket.

[0007] Preferably, the overweight signal receiving sleeve is a vertical cylindrical structure, and the overweight signal sending column is movably sleeved in the inner cavity of the overweight signal receiving sleeve.

[0008] Preferably, an airbag is fixedly installed in the middle of the lower surface of the pressure plate, an air hole is opened inside the left rotating shaft, the left end of the left rotating shaft passes through the reducer, and the left end of the left rotating shaft is movably sleeved with a two-way valve. The left side of the two-way valve is slidably installed with the inner surface of the outer sleeve, and the bottom of the two-way valve is connected to the airbag through an air pipe, an air groove is opened circumferentially on the outer surface of the coupling, an installation groove is opened on the outer surface of the reel, and the interior of the reel is movably sleeved with a circumferentially distributed expansion plate through the installation groove.

[0009] Preferably, a sealing sleeve is fixedly mounted inside the inner hole, the sealing sleeve is disconnected in the middle and the disconnection point is sealed with the coupling, and two ends of the inner hole are fixedly mounted with oil chambers, the oil chamber is located on the outer surface of the sealing sleeve, the inner movably mounted with one end of a push rod, the inner side of the push rod passes through the oil chamber, oil passages are opened on both sides of the reel, the top of the oil passage is fixedly mounted with an oil filling valve, the lower end of the oil passage is connected with the oil chamber, the reel is provided with an oil ring groove, the lower part of the oil ring groove is provided with a through groove connected with the oil chamber, the reel is provided with a valve hole horizontally, one end of the valve hole is connected with the mounting groove, the other end of the valve hole is connected with the through groove, the other end of the valve hole is slidably mounted with a switch mechanism, and the outer surface of the reel is provided with an oil injection port, the oil injection port is composed of vertical grooves distributed in an array and horizontal grooves connecting all the vertical grooves, and the upper part of the oil ring groove is connected to the oil injection port.

[0010] Preferably, the oil filling valve is a one-way valve with its conducting direction toward the oil channel.

[0011] Preferably, the switch mechanism is composed of a sealing plate with a hole and a spring. When the valve hole is pressurized, the sealing plate squeezes the spring to move, and the hole on the sealing plate cooperates with the through groove.

[0012] Preferably, the oil injection ports are evenly distributed on the outer surface of the drum.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention fixes a pressure plate on the lower surface of the reducer, the power unit and the brake, and evenly distributes and fixes compression springs on the lower surface of the pressure plate. An overweight signal sending column is fixedly installed on the lower surface of the pressure plate, and the overweight signal sending column is located at the inner ring of the compression spring. An overweight signal receiving sleeve is fixedly installed on the lower surface of the inner cavity of the outer sleeve, so that when the steel rope hanging object on the drum is subjected to gravity, the pressure plate will be pulled down to compress the compression spring first. When the weight of the hanging object causes the bottom surface of the overweight signal sending column to contact and cooperate with the overweight signal receiving sleeve, that is, the weight of the hanging object exceeds the load of the power unit, the hanging object needs to be deleted and repacked to prevent the power unit from being frequently overloaded and to increase the service life of the power unit.

[0015] 2. The present invention distributes a movable expansion plate circumferentially inside the drum, and the air bag connects the air hole and the air groove, so that when the steel rope wound on the drum lifts an object, the steel rope will be tightened by the tension, and at the same time, the pressure plate will be pressed down, and the compressed gas in the air bag will be injected into the inner hole through the two-way valve and the air groove to increase the pressure, thereby pushing the expansion plate outward, which can expand the steel rope wound on the outer surface of the drum, prevent the steel rope from being tightened when lifting the object, causing the steel rope wound on the outer surface of the drum to rub against each other, thereby ensuring the service life of the steel rope.

[0016] 3. The present invention fixes an oil chamber at both ends of the inner hole and on the outer surface of the sealing sleeve, a push rod is movably mounted inside the oil chamber, an oil ring groove is opened in the drum, a groove connected to the oil chamber is opened in the lower part of the oil ring groove, and the upper part of the oil ring groove is connected to the oil injection port, so that after the steel rope wound on the outer surface of the drum is hung with an object, the pressure plate moves downward to inject the air pressure in the airbag into the inner hole, and at the same time, the push rod can be squeezed and moved, so that the lubricating and cooling oil in the oil chamber is sprayed out, and the spraying amount changes according to the weight of the hung object. The spraying of the lubricating and cooling oil does not require an additional pump, and the electrical control of the equipment is simpler, thereby ensuring the service life of the steel rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front cross-sectional view of the present invention;

[0018] Figure 2 It is a side sectional view of the present invention;

[0019] Figure 3 This is a front structural diagram of the reel of the present invention;

[0020] Figure 4 It is a cross-sectional view of the fuel injection port of the present invention;

[0021] Figure 5 For the present invention Figure 1 Enlarged view of point A in the middle;

[0022] Figure 6 It is a top view of the mounting groove of the present invention.

[0023] In the figure: 1. reel; 2. reducer; 3. power unit; 4. brake; 5. inner hole; 6. coupling; 7. rotating shaft; 8. pressure plate; 9. outer sleeve; 10. compression spring; 11. overweight signal sending column; 12. overweight signal receiving sleeve; 13. air bag; 14. air hole; 15. two-way valve; 16. air groove; 17. expansion plate; 18. oil chamber; 19. push rod; 20. oil channel; 21. oil filling valve; 22. oil ring groove; 23. valve hole; 24. switch mechanism; 25. oil injection port; 26. rope guide; 27. shell; 28. sealing sleeve; 29. ​​rope mouth; 30. air pipe; 31. through groove; 32. installation groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figures 1 to 6As shown, in the embodiment of the present invention, an electrically controlled electric hoist for a crane includes a drum 1, a reducer 2 is movably installed on the left side of the drum 1, a power device 3 is movably mounted on the right side of the drum 1, a brake 4 is mounted on the right side bearing of the output shaft of the power device 3, an inner hole 5 is opened inside the drum 1, a coupling 6 is movably mounted in the middle of the inner hole 5, a rotating shaft 7 is threadedly mounted on both the left and right ends of the coupling 6, the left rotating shaft 7 is movably mounted on the reducer 2, the right rotating shaft 7 passes through the power device 3 and the brake 4 and is movably mounted, the right rotating shaft 7 is fixedly installed on the power device 3, a housing 27 is fixedly installed on the outer ring of one side of the reducer 2, the drum 1 is mounted in the housing 27, a steel rope is wound on the outer surface of the drum 1, and a rope guide 2 is slidably mounted on one side of the housing 27. 6. A pressure plate 8 is fixedly installed on the lower surface of the reducer 2, the power device 3, and the brake 4. The outer surface of the pressure plate 8 is movably covered with a jacket 9. A rope opening 29 is opened on one side of the bottom surface of the jacket 9. The jacket 9 covers the drum 1, the reducer 2, the power device 3, and the brake 4. The lower surface of the pressure plate 8 is fixedly installed with uniformly distributed compression springs 10. The lower end of the compression spring 10 is fixedly installed with the lower surface of the inner cavity of the jacket 9. An overweight signal sending column 11 is fixedly installed on the lower surface of the pressure plate 8. The overweight signal sending column 11 is located on the inner ring of the compression spring 10. An overweight signal receiving sleeve 12 is fixedly installed on the lower surface of the inner cavity of the jacket 9, so that when the steel rope hanging object on the drum 1 is subjected to gravity, it will first pull the pressure plate 8 downward to compress the compression spring 10. When the weight of the hanging object causes the overweight signal The bottom surface of the signal-emitting column 11 contacts and cooperates with the overweight signal receiving sleeve 12, that is, the weight of the suspended object exceeds the load of the power device 3, and the suspended object needs to be deleted and repacked to prevent the power device 3 from being frequently overloaded and to improve the service life of the power device 3. The overweight signal receiving sleeve 12 is a vertical cylindrical structure, and the overweight signal-emitting column 11 is movably sleeved in the inner cavity of the overweight signal receiving sleeve 12, so that when the pressure plate 8 slides up and down under the gravity, it can be limited by the cooperation of the overweight signal-emitting column 11 and the overweight signal receiving sleeve 12 to prevent the steel rope from swinging easily when the suspended object is transported, driving the pressure plate 8 to shake, and ensuring that the pressure plate 8 only slides up and down, thereby ensuring the stability of the equipment in the working state, and the middle part of the lower surface of the pressure plate 8 is fixedly installed An air bag 13 is installed, an air hole 14 is provided inside the left rotating shaft 7, the left end of the left rotating shaft 7 passes through the reducer 2, a two-way valve 15 is movably mounted on the left end of the left rotating shaft 7, the left side of the two-way valve 15 is slidably mounted on the inner surface of the outer sleeve 9, the lower part of the two-way valve 15 is connected with the air bag 13 through the air pipe 30, an air groove 16 is circumferentially provided on the outer surface of the coupling 6, and the inside of the drum 1 is movably mounted with a circumferentially distributed expansion plate 17 through the installation groove 32, and the expansion plate 17 is slidably sealed and installed with the installation groove 32, so that when the steel rope wound by the drum 1 lifts an object, the steel rope will be tightened by tension, and at the same time, the pressure plate 8 will be pressed down, and the compressed gas in the air bag 13 will be injected into the inner hole 5 through the two-way valve 15 and the air groove 16 to increase the pressure, thereby pushing the expansion plate 17 outward.The steel rope wound on the outer surface of the drum 1 can be expanded to prevent the steel rope from being tightened when lifting an object, causing the steel ropes wound on the outer surface of the drum 1 to rub against each other, thereby ensuring the service life of the steel rope. The inner fixed sleeve of the inner hole 5 is provided with a sealing sleeve 28, the middle part of the sealing sleeve 28 is disconnected and the disconnected part is sealed with the coupling 6, so that the gas injected from the airbag 13 will not escape through the rotation of the rotating shaft 7, thereby ensuring the outward expansion force of the rotating shaft 7. The two ends of the inner hole 5 are fixedly installed with oil chambers 18, the oil chambers 18 are located on the outer surface of the sealing sleeve 28, and the inner movable sleeve of the oil chamber 18 is provided with one end of the push rod 19, and the inner side of the push rod 19 passes through the oil The oil passages 20 are provided on both sides of the reel 1, and an oil filling valve 21 is fixedly installed on the top of the oil passages 20. The lower end of the oil passages 20 is connected with the oil chamber 18. An oil ring groove 22 is provided in the reel 1, and a through groove 31 connected with the oil chamber 18 is provided in the lower part of the oil ring groove 22. A valve hole 23 is horizontally provided inside the reel 1, and one end of the valve hole 23 is connected with the mounting groove 32, and the other end of the valve hole 23 is connected with the through groove 31. A switch mechanism 24 is slidably sleeved on the other end of the valve hole 23. The switch mechanism 24 is composed of a sealing plate with a hole and a spring. When the valve hole 23 is pressurized, the sealing plate squeezes the spring to move, and the sealing plate The hole cooperates with the through groove 31, so that the equipment sprays oil only when the steel rope of the transported object bears gravity and the valve hole 23 is pressurized to prevent waste of oil. The outer surface of the drum 1 is provided with an oil injection port 25, which is composed of vertical grooves distributed in an array and horizontal grooves connecting all the vertical grooves. The oil injection port 25 is evenly distributed on the outer surface of the drum 1, so that the lubricating and cooling oil is diffused from the inside to the outside. When the drum rotates during the transportation of materials, the wound steel rope can be lubricated and cooled. The existing oil injection is sprayed from the outside to the outer surface of the wound steel rope, and the speed of lubricating the steel rope to the inner ring is slow, which ensures the lubrication effect of the steel rope. The upper part of the oil ring groove 22 is connected to the outer surface of the wound steel rope. The oil injection port 25 allows the steel rope wound on the outer surface of the drum 1 to move downward after the object is hung, and the pressure plate 8 can be squeezed and moved to inject the air pressure in the airbag 13 into the inner hole 5, so that the lubricating and cooling oil in the oil chamber 18 is sprayed out. The spraying amount changes according to the weight of the hung object. The spraying of the lubricating and cooling oil does not require an additional pump to ensure the service life of the steel rope. The oil filling valve 21 is a one-way valve with the conduction direction toward the oil channel 20. After the lubricating and cooling oil in the oil chamber 18 is used up, it is only necessary to connect the oil pipe with the oil filling valve 21. The oil pressure in the oil pipe is large, so that the lubricating and cooling oil is injected into the oil chamber 18, which is convenient for refueling.

[0026] Working principle and usage process:

[0027] The steel rope hanging object on the drum 1 is subject to gravity, which will first pull the pressure plate 8 downward to compress the compression spring 10. When the weight of the hanging object causes the bottom surface of the overweight signal sending column 11 to contact and cooperate with the overweight signal receiving sleeve 12, that is, the weight of the hanging object exceeds the load of the power device 3, the hanging object needs to be deleted and repacked. At the same time, the steel rope will be tightened by the tension, which will drive the pressure plate 8 to press down, and the compressed gas in the air bag 13 will be injected into the inner hole 5 through the two-way valve 15 and the air groove 16 to increase the pressure, thereby pushing the expansion plate 17 outward, which can expand the steel rope wound on the outer surface of the drum 1. The pressure plate 8 moves downward to inject the air pressure in the air bag 13 into the inner hole 5, and at the same time, it can squeeze and move the push rod 19, so that the lubricating cooling oil in the oil chamber 18 is sprayed out, and the spraying amount varies according to the weight of the hanging object.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrically controlled electric hoist for a crane, comprising a drum (1), a reducer (2) being movably mounted on the left side of the drum (1), a power device (3) being movably mounted on the right side of the drum (1), a brake (4) being mounted on the right side bearing of the output shaft of the power device (3), an inner hole (5) being provided inside the drum (1), a coupling (6) being movably mounted in the middle of the inner hole (5), and a rotating shaft (7) being threadedly mounted on both left and right ends of the coupling (6), The rotating shaft (7) on the left side is movably mounted on the reducer (2), the rotating shaft (7) on the right side passes through the power device (3) and is movably mounted on the brake (4), the rotating shaft (7) on the right side is fixedly mounted on the power device (3), a housing (27) is fixedly mounted on the outer ring of one side of the reducer (2), the drum (1) is movably mounted in the housing (27), a steel rope is wound around the outer surface of the drum (1), and a rope guide (26) is slidably mounted on one side of the housing (27), characterized in that: A pressure plate (8) is fixedly mounted on the lower surface of the reducer (2), the power device (3) and the brake (4); a jacket (9) is movably mounted on the outer surface of the pressure plate (8); a rope opening (29) is provided on one side of the bottom surface of the jacket (9); the jacket (9) mounts the reel (1), the reducer (2), the power device (3) and the brake (4) therein; a uniformly distributed compression spring (10) is fixedly mounted on the lower surface of the pressure plate (8); the lower end of the compression spring (10) is fixedly mounted on the lower surface of the inner cavity of the jacket (9); an overweight signal sending column (11) is fixedly mounted on the lower surface of the pressure plate (8); the overweight signal sending column (11) is located on the inner ring of the pressure spring (10); and an overweight signal receiving sleeve (12) is fixedly mounted on the lower surface of the inner cavity of the jacket (9); An air bag (13) is fixedly installed in the middle of the lower surface of the pressure plate (8), an air hole (14) is opened inside the left rotating shaft (7), the left end of the left rotating shaft (7) passes through the reducer (2), and the left end of the left rotating shaft (7) is movably sleeved with a two-way valve (15), the left side of the two-way valve (15) is slidably installed with the inner surface of the outer sleeve (9), and the lower part of the two-way valve (15) is connected to the air bag (13) through an air pipe (30), an air groove (16) is opened in the circumferential direction of the outer surface of the coupling (6), and an installation groove (32) is opened on the outer surface of the reel (1), and the interior of the reel (1) is movably sleeved with a circumferentially distributed expansion plate (17) through the installation groove (32); The inner hole (5) is fixedly sleeved with a sealing sleeve (28), the middle part of the sealing sleeve (28) is disconnected and the disconnected part is sealed with the coupling (6), the two ends of the inner hole (5) are fixedly installed with oil chambers (18), the oil chambers (18) are located on the outer surface of the sealing sleeve (28), the inner part of the oil chamber (18) is movably sleeved with one end of a push rod (19), the inner side of the push rod (19) passes through the oil chamber (18), the two sides of the reel (1) are provided with oil passages (20), the top end of the oil passages (20) is fixedly installed with an oil filling valve (21), the lower end of the oil passages (20) is communicated with the oil chamber (18), and the reel (1) An oil ring groove (22) is provided inside, a through groove (31) communicating with the oil chamber (18) is provided at the lower part of the oil ring groove (22), a valve hole (23) is transversely provided inside the reel (1), one end of the valve hole (23) is communicated with the mounting groove (32), the other end of the valve hole (23) is communicated with the through groove (31), a switch mechanism (24) is slidably sleeved on the other end of the valve hole (23), an oil injection port (25) is provided on the outer surface of the reel (1), the oil injection port (25) is composed of vertical grooves distributed in an array and horizontal grooves communicating with all the vertical grooves, and the upper part of the oil ring groove (22) is connected with the oil injection port (25).

2. The electrically controlled electric hoist for a crane according to claim 1, characterized in that: The overweight signal receiving sleeve (12) is a vertical cylindrical structure, and the overweight signal sending column (11) is movably sleeved in the inner cavity of the overweight signal receiving sleeve (12).

3. The electrically controlled electric hoist for a crane according to claim 2, characterized in that: The oil injection valve (21) is a one-way valve with its conducting direction facing the oil passage (20).

4. The electrically controlled electric hoist for a crane according to claim 3, characterized in that: The switch mechanism (24) is composed of a sealing plate with a hole and a spring. When the valve hole (23) is pressurized, the sealing plate squeezes the spring to move, and the hole on the sealing plate cooperates with the through groove (31).

5. The electrically controlled electric hoist for a crane according to claim 4, characterized in that: The oil injection ports (25) are evenly distributed on the outer surface of the reel (1).

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