Electrical protection device for a metallurgical crane hoist

Abstract

An electrical protection device of a metallurgical crane hoisting mechanism, including a shell, the top of the shell is provided with a wire hole, the inside of the shell is equipped with a support table, the support table is fixed with a vertical plate, the first reel and the second reel are equipped between the two vertical plates, the cable groove is opened on the first reel and the second reel, the left end of the first reel is rotatably assembled on the vertical plate, the right end of the second reel is rotatably assembled on the vertical plate, the end of the two support shafts extends out of the vertical plate and the end of the support shaft is fixed with a gear, the support table below the gear is fixed with a guide rail, the guide rail is slidably connected with a guide block, the top of the guide block is fixed with a rack, the rack and the gear are mutually engaged, the support table on one end of the guide block is fixed with a fixing seat, the fixing seat and the guide block are equipped with a tension spring which plays a restoring role. The utility model has the advantages of simple structure and convenient use.

Description

Technical Field

[0001] This utility model belongs to the field of crane technology, and in particular relates to an electrical protection device for the hoisting mechanism of a metallurgical crane. Background Technology

[0002] A crane is a multi-action lifting machine that vertically lifts and horizontally moves heavy objects within a certain range. Also known as an overhead crane, gantry crane, or hoist, it includes the crane frame, trolley traveling mechanism, lifting trolley, hoisting mechanism, trolley traveling mechanism, and lifting attachments. Depending on its application, a crane used to lift molten steel ladles in a metallurgical workshop is called a metallurgical crane. A metallurgical crane works by longitudinal movement along the factory rails, lateral movement of the trolley, and lifting / lowering of the hook. The lifting attachments of a metallurgical crane generally include those shown in the instruction manual. Figure 1 The upper support plate 11, lower support plate 12, hook 13, and the movable pulley block 14 and rotary motor 15 at the top of the upper support plate 11 are provided. The rotary motor can drive the lower support plate to rotate. Since the motor needs to be powered by a cable, as the lifting device rises under the traction of the wire rope, the cable will pile up and fall downwards, and the cable is prone to knotting, causing the cable to be torn. Moreover, due to the high temperature and high dust in the metallurgical workshop, the rotary motor is also prone to being affected by the high temperature and high dust. Therefore, the electrical protection of the lifting device is required. Utility Model Content

[0003] To address the technical problem of existing metallurgical cranes' hoisting mechanisms lacking electrical protection mechanisms, which leads to easy tangling of cables, this utility model provides an electrical protection device for the hoisting mechanism of a metallurgical crane. The device includes a housing that is detachably fixed to the top of the crane's lifting device. The housing serves a protective function, reducing the heat radiation from the molten steel ladle to the rotating motor and reducing the amount of smoke and dust falling onto the rotating motor. The top of the housing has a cable hole for the cable to pass through. The shell has a horizontally positioned support platform inside, which provides support. The support platform is fixed to the shell, and two vertically spaced plates are fixed on the support platform. Between the two plates are a first drum and a second drum arranged coaxially, with the diameter of the first drum being much smaller than that of the second drum. When the lifting device rises under the traction of the hoisting mechanism, the second drum winds the cable while the first drum releases the cable. Because the diameter of the second drum is much larger than that of the first drum, the second drum winds up a longer cable, while the first drum releases a shorter cable. This reduces the stacking of the cable and thus reduces the probability of tangling. When the lifting device falls, the second drum releases the cable, and the first drum winds the cable, repeating the process. Both the first and second drums have cable grooves for winding the cable. The left end of the first drum is rotatably mounted on the vertical plate via a support shaft, and the right end of the second drum is rotatably mounted on the vertical plate via a support shaft. The right end of the first drum and the left end of the second drum are fixedly connected. The ends of both support shafts extend out of the vertical plate, and gears are fixed to the ends of both support shafts. A guide rail is fixed on the support platform below the gears, and a guide slider is slidably connected inside the guide rail. A rack is fixed to the top of the guide slider, and the rack meshes with the gear. A fixed seat is fixed on the support platform at one end of the guide slider. A tension spring for resetting is provided between the fixed seat and the guide slider. When the lifting device rises, the tension spring pulls the rack to drive the gear to rotate, and the gear drives the first and second drums to rotate, so that the second drum winds the cable and the first drum releases the cable. When the lifting device descends, under the action of the lifting device's gravity, the first and second drums fall, and the cable pulls the first and second drums to rotate, so that the second drum releases the cable and the first drum winds the cable. Above the second drum is a first rope guiding mechanism, which includes two parallel and spaced-apart slide rods, both ends of which are fixed to a vertical plate. A slider is located between the two slide rods, with both ends of the slider slidably connected to the slide rods. The top of the slider has a vertical through hole for the cable to pass through. Below the first drum is a second rope guiding mechanism, which also includes two parallel and spaced-apart slide rods, the left ends of which are fixed to a vertical plate. A slider is located between the two slide rods, with both ends of the slider slidably connected to the slide rods. The top of the slider has a vertical through hole for the cable to pass through.

[0004] Preferably, the top of the lifting device is fixed with an open take-up drum, and the right end of the take-up drum has a cable hole for the cable to pass through.

[0005] Preferably, the cross-section of the guide slider is convex, and the guide rail has a groove that matches the guide slider.

[0006] The above scheme has the following advantages:

[0007] The arrangement of the first and second drums is advantageous because the diameter of the second drum is much larger than that of the first drum. Therefore, the second drum can wind up a longer cable, while the first drum releases a shorter cable. This reduces cable stacking and thus the probability of tangling. The tension spring acts as a reset mechanism, driving the rack and pinion to rotate as the lifting device rises. This, in turn, causes the second drum to wind up the cable and the first drum to release it. The housing provides protection, reducing heat radiation from the molten steel ladle to the rotating motor and preventing dust from settling on it. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the lifting device for a metallurgical crane.

[0009] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0010] Figure 3 This is a top view of the structure of this utility model.

[0011] Reference numerals: 1. Lifting device; 2. Housing; 3. First rope guide mechanism; 4. Second rope guide mechanism; 11. Upper support plate; 12. Lower support plate; 13. Hook; 14. Moving pulley block; 15. Rotary motor; 16. Cable; 20. Take-up drum; 21. Support platform; 22. Vertical plate; 23. First drum; 24. Second drum; 25. Gear; 26. Rack; 27. Guide rail; 28. Guide slider; 29. ​​Fixed seat; 291. Tension spring; 31. Sliding rod; 32. Sliding block. Detailed Implementation

[0012] like Figure 1-3As shown, an electrical protection device for the hoisting mechanism of a metallurgical crane includes a housing 2 that is detachably fixed to the top of the lifting device 1. The housing 2 serves a protective function, reducing the heat radiation from the molten steel ladle to the rotating motor 15 and the dust falling onto the rotating motor 15. The top of the housing 2 has a wire hole for the cable 16 to pass through. The housing 2 has a horizontally arranged support platform 21 inside, which provides support. The support platform 21 is fixed to the housing 2. Two vertically arranged and spaced-apart uprights 22 are fixed on the support platform 21. A first drum 23 and a second drum 24 are arranged coaxially between the two uprights 22. The diameter of the first drum 23 is much smaller than the diameter of the second drum 24. When the lifting device 1 rises under the traction of the lifting mechanism, the second drum 24 winds the cable 16, and the first drum 23 releases the cable 16. Since the diameter of the second drum 24 is much larger than the diameter of the first drum 23, the second drum 24 winds up a longer cable 16, while the first drum 23 releases a shorter cable 16. The cable 16 released by the first drum 23 is less stacked, thus reducing the probability of knotting. When the lifting device 1 falls, the second drum 24 releases the cable 16, and the first drum 23 winds up the cable 16, working in a reciprocating manner. Both the first drum 23 and the second drum 24 have cable grooves for winding the cable 16. The left end of the first drum 23 is rotatably mounted on the upright plate 22 via a support shaft, and the right end of the second drum 24 is rotatably mounted on the upright plate 22 via a support shaft. The right end of the first drum 23 and the left end of the second drum 24 are fixedly connected. The ends of both support shafts extend out of the upright plate 22, and gears 25 are fixed to the ends of both support shafts. A guide rail 27 is fixed on the support platform below the gears 25. A guide slider 28 is slidably connected inside the guide rail 27. A rack 26 is fixed to the top of the guide slider 28. The rack 26 meshes with the gear 25. A fixed seat 29 is fixed on the support platform 21 at one end. A tension spring 291 for resetting is provided between the fixed seat 29 and the guide slider 28. When the lifting device 1 rises, the tension spring 291 pulls the rack 26 to drive the gear 25 to rotate. The gear 25 drives the first drum 23 and the second drum 24 to rotate, so that the second drum 24 winds the cable 16 and the first drum 23 releases the cable 16. When the lifting device 1 descends, under the action of the gravity of the lifting device 1, the first drum 23 and the second drum 24 fall. The cable 16 pulls the first drum 23 and the second drum 24 to rotate, so that the second drum 24 releases the cable 16 and the first drum 23 winds the cable 16. A first rope guiding mechanism 3 is provided above the second drum 24. The first rope guiding mechanism 3 includes two parallel and spaced slide rods 31. Both ends of the slide rods 31 are fixed on the upright plate 22. A slider 32 is provided between the two slide rods 31, and both ends of the slider 32 are slidably connected to the slide rods 31. A through hole for the cable 16 to pass through is vertically opened at the top of the slider 32.Below the first drum 23, there is a second rope guiding mechanism 4. The second rope guiding mechanism 4 includes two parallel and spaced-apart slide rods 31. The left end of each slide rod 31 is fixed to the upright plate. A slider 32 is provided between the two slide rods 31. Both ends of the slider 32 are slidably connected to the slide rods 31. The top of the slider 32 has a through hole for the cable 16 to pass through.

[0013] Preferably, the top of the lifting device 1 is fixed with a take-up drum 20 with an open top, and the right end of the take-up drum 20 has a cable hole for the cable to pass through.

[0014] Preferably, the cross-section of the guide slider 28 is convex, and the guide rail 27 is provided with a groove that matches the guide slider 28.

[0015] In use, when the lifting device 1 rises under the traction of the hoisting mechanism, the second drum 24 winds the cable 16, and the first drum 23 releases the cable 16. Since the diameter of the second drum 24 is much larger than that of the first drum 23, the cable 16 wound on by the second drum 24 is longer, while the cable 16 released by the first drum 23 is shorter. This reduces the stacking of the cable 16 released by the first drum 23, thus reducing the probability of tangling. When the lifting device 1 rises, the tension spring 291 pulls the rack 2... 6 drives gear 25 to rotate, gear 25 drives first drum 23 and second drum 24 to rotate, so that second drum 24 winds cable 16 and first drum 23 releases cable 16; when lifting device 1 descends, under the action of gravity of lifting device 1, first drum 23 and second drum 24 fall, cable 16 pulls first drum 23 and second drum 24 to rotate in opposite directions, so that second drum 24 releases cable 16, first drum 23 winds cable 16, and tension spring 291 is stretched.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. An electrical protection device for the hoisting mechanism of a metallurgical crane, comprising a housing detachably fixed to the top of the crane's lifting device, wherein the top of the housing has a cable hole for a cable to pass through, characterized in that: The housing has a horizontally positioned support platform fixed to it. Two vertically spaced plates are fixed to the support platform. Between the two plates are a first and a second reel, coaxially aligned, with the diameter of the first reel being significantly smaller than that of the second reel. Both the first and second reels have cable grooves for winding cables. The left end of the first reel is rotatably mounted to the plate via a support shaft, and the right end of the second reel is rotatably mounted to the plate via a support shaft. The right end of the first reel is fixedly connected to the left end of the second reel. The ends of both support shafts extend beyond the plates, and gears are fixed to the ends of both shafts. A guide rail is fixed to the support platform below the gears, and a guide slider is slidably connected within the guide rail. A rack is fixed to the top of the guide slider, meshing with the gear. A fixed seat is fixed to the support platform at one end of the guide slider, and a tension spring for resetting is located between the fixed seat and the guide slider.

2. The electrical protection device for the hoisting mechanism of a metallurgical crane according to claim 1, characterized in that: The second drum is provided with a first rope guiding mechanism. The first rope guiding mechanism includes two parallel and spaced slide rods. Both ends of the slide rods are fixed to the vertical plate. A slider is provided between the two slide rods, and both ends of the slider are slidably connected to the slide rods. The top of the slider is vertically provided with a through hole for the cable to pass through.

3. The electrical protection device for the hoisting mechanism of a metallurgical crane according to claim 1, characterized in that: Below the first drum is a second rope guiding mechanism, which includes two parallel and spaced-apart slide rods. The left ends of the slide rods are fixed to the vertical plate, and a slider is provided between the two slide rods. Both ends of the slider are slidably connected to the slide rods, and the top of the slider has a through hole for the cable to pass through.

4. The electrical protection device for the hoisting mechanism of a metallurgical crane according to claim 1, characterized in that: The top of the lifting device is fixed with an open take-up drum, and the right end of the take-up drum has a cable hole for the cable to pass through.

5. The electrical protection device for the hoisting mechanism of a metallurgical crane according to claim 1, characterized in that: The cross-section of the guide slider is convex, and the guide rail has a groove that matches the guide slider.

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