Metallurgical electric hoist overspeed protection device

Abstract

The invention discloses an overspeed protection device for a metallurgical electric hoist, and relates to the technical field of cranes. The overspeed protection device for the metallurgical electric hoist comprises the electric hoist, a walking device is fixedly connected to the top of the electric hoist, a connecting shaft is fixedly connected to the right side of a reel of the electric hoist, an overspeed detection mechanism is fixedly connected to the right side of the reel of the electric hoist, and a speed reduction mechanism is fixedly connected to the outer wall of the connecting shaft. The outer wall of the connecting shaft is fixedly connected with a brake mechanism on the right side of the speed reduction mechanism. According to the overspeed protection device for the metallurgical electric hoist, a locking telescopic rod extends and is clamped into a corresponding groove in a locking disc, so that a connecting wheel rolls up a pulling wire, a pulling-up block is lifted upwards from the bottom of a guide pipe, part of energy is converted into potential energy of the pulling-up block, and the speed of a lifting hook of the electric hoist is slowed down; and the disc brake disc is prevented from losing the braking capacity due to overheating.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and specifically to an overspeed protection device for a metallurgical electric hoist. Background Art

[0002] In the metallurgical industry, electric hoists are indispensable and powerful assistants. Electric hoists can accurately lift various metal raw materials, from huge ores to bundled metal billets. In the smelting workshop, electric hoists shuttle efficiently and quickly transport raw materials to designated positions, greatly improving production efficiency and providing a solid guarantee for the orderly progress of metallurgical production; The patent with the application number CN201520659182.3 discloses a double-brake metallurgical electric hoist, which includes a traveling device. A drum is provided at the lower end of the traveling device. A first brake is connected to the left end of the drum. A base is provided inside the first brake. Left and right brake arms are respectively provided on both sides of the upper end of the base. Push rods are connected to the tops of the left and right brake arms. Brake shoes are provided on the inner sides of the middle parts of the left and right brake arms. The right end of the push rod is connected to a lever. The lower end of the lever is connected to a power rod. An electromagnet is provided on the right part of the power rod. A weight is suspended at the lower right end of the power rod. The left end of the first brake is connected to a motor; When the existing electric hoist has an accidental overspeed, it needs to be quickly decelerated and braked through a braking device. The existing device only uses a simple friction device for decelerating and braking. Friction braking is prone to overheating and losing the braking ability, and cannot achieve a good speed reduction and braking effect. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides an overspeed protection device for a metallurgical electric hoist to solve the problems raised in the above background art.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: An overspeed protection device for a metallurgical electric hoist, including an electric hoist. A traveling device is fixedly connected to the top of the electric hoist. A connecting shaft is fixedly connected to the right side of the wire reel of the electric hoist. An overspeed detection mechanism is fixedly connected to the right side of the wire reel of the electric hoist. A speed reduction mechanism is fixedly connected to the outer wall of the connecting shaft. A braking mechanism is fixedly connected to the outer wall of the connecting shaft on the right side of the speed reduction mechanism; The braking mechanism includes: A disc brake disc, which is fixedly connected to the right side of the connecting shaft; An electric caliper, which is arranged at the bottom of the disc brake disc; A water tank, which is arranged on the right side of the electric hoist.

[0005] Preferably, the overspeed detection mechanism includes a reflective sheet, several reflective sheets are provided, and the reflective sheets are fixedly connected to the right side of the wire reel of the electric hoist. An infrared speed sensor is fixedly connected inside the electric hoist on the right side of the reflective sheet.

[0006] Preferably, the overspeed detection mechanism includes a control box, the control box is electrically connected to the infrared speed sensor, the control box is electrically connected to the braking mechanism, and the control box is electrically connected to the speed reduction mechanism.

[0007] Preferably, a speed controller is fixedly connected to the outer wall of the control box, a rotating warning light is fixedly connected to the outer wall of the control box, a knob switch is fixedly connected to the outer wall of the control box, an air switch is fixedly connected inside the control box, a control contactor is fixedly connected inside the control box, and a transformer is fixedly connected inside the control box.

[0008] Preferably, a spiral plate is fixedly connected inside the disc brake disc, a connecting pipe is fixedly connected to the right side of the electric caliper through a bearing, a solenoid valve is fixedly connected to the top of the connecting pipe, the solenoid valve is fixedly connected to the bottom of the water tank, a suspension assembly is fixedly connected to the top of the water tank, a connecting plate is fixedly connected to the left side of the suspension assembly, and the connecting plate is fixedly connected to the traveling device.

[0009] Preferably, the speed reduction mechanism includes a connecting wheel, the connecting wheel is movably connected to the outer wall of the connecting shaft through a bearing, a locking telescopic rod is fixedly connected to the right side of the connecting wheel, a locking disc is fixedly connected to the outer wall of the connecting shaft on the right side of the locking telescopic rod, and a groove corresponding to the locking telescopic rod is provided on the left side of the locking disc.

[0010] Preferably, a guide pipe is fixedly connected to the bottom of the electric hoist, a pulling wire is fixedly connected to the bottom of the connecting wheel, and a lifting block is fixedly connected to the bottom of the pulling wire.

[0011] Preferably, two movable plates are movably connected inside the lifting block, a pulling spring is fixedly connected to the bottom of the lifting block, the bottom of the pulling spring is fixedly connected to the inner bottom of the guide pipe, and a distance measuring sensor is fixedly connected to the inner wall of the guide pipe at the top of the pulling wire.

[0012] The present invention provides a metallurgical electric hoist overspeed protection device. It has the following beneficial effects: 1. For this metallurgical electric hoist overspeed protection device, when the locking telescopic rod extends and is stuck into the corresponding groove on the locking disc, the connecting wheel winds up the pulling wire, and then the lifting block is lifted upward from the bottom of the guide pipe. Then, part of the energy is converted into the potential energy of the lifting block, thereby slowing down the speed of the electric hoist hook, facilitating the braking mechanism to brake, avoiding overheating of the disc brake disc and losing the braking ability, and effectively braking the stall.

[0013] 2. The overspeed protection device for the metallurgical electric hoist adopts a rotational speed pulse transformation with a rigid ratio, which is not affected by external factors such as temperature and grid voltage, and has no drift. Compared with the rotational speed analog control using a tachogenerator feedback, the present invention has a higher speed stability accuracy.

[0014] 3. For the overspeed protection device of the metallurgical electric hoist, by opening the solenoid valve, the rotating spiral plate will cause the water inside the water tank to enter the inside of the disc brake through the connecting pipe and then discharge from the holes on the disc brake, so as to dissipate heat from the disc brake. The faster the disc brake rotates, the more heat is generated by friction, and at the same time, the more water is pumped by the spiral plate from the disc brake. Thus, the water supply is adjusted according to the speed to prevent the disc brake from overheating during braking and affecting the braking.

[0015] 4. For the overspeed protection device of the metallurgical electric hoist, by lifting the lifting block, the space at the top of the lifting block becomes smaller, and at the same time, part of the energy will push the gas inside the guide pipe to the outside, reducing the kinetic energy of the hook. At the same time, the flowing air will blow onto the disc brake with water on its surface, promoting the evaporation of the water on the surface of the disc brake and better cooling the disc brake, which can better prevent the disc brake from overheating during braking and affecting the braking.

[0016] 5. For the overspeed protection device of the metallurgical electric hoist, the overspeed detection mechanism adopts an electronic speed measurement system with a rotational speed frequency control method, which can arbitrarily set the rated lifting speed and operating speed, facilitating daily inspection and simulation operation tests. In addition, the electrical control box is separately set and does not interfere with the electrical control systems of the electric hoist and the crane, facilitating daily inspection and maintenance.

[0017] 6. For the overspeed protection device of the metallurgical electric hoist, the overspeed detection mechanism displays the operating speed and running speed in real time, with clear speed values, and is equipped with an action alarm, making its daily operation very intuitive. In addition, in order to prevent the risk of delay in lifting caused by misoperation, a changeover switch is added to the control box, achieving the effect of emergency operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front perspective structure schematic diagram of the present invention; Figure 2 is Figure 1 the enlarged structure schematic diagram of part A in Figure 3 is the back perspective structure schematic diagram of the present invention; Figure 4 is Figure 1 the sectional structure schematic diagram; Figure 5 is the connection shaft structure schematic diagram of the present invention; Figure 6 is Figure 5Schematic diagram of the enlarged structure of part E; Figure 7 Schematic diagram of the control box structure of the present invention; Figure 8 Schematic diagram of the speed controller structure of the present invention; Figure 9 Schematic diagram of the circuit of the overspeed detection mechanism of the present invention; Figure 10 Schematic diagram of the disc brake structure of the present invention; Figure 11 Schematic diagram of the sectional structure of the disc brake of the present invention; Figure 12 is Figure 3 Schematic diagram of the enlarged structure of part B; Figure 13 is Figure 4 Schematic diagram of the enlarged structure of part C; Figure 14 is Figure 4 Schematic diagram of the enlarged structure of part D; Figure 15 Schematic diagram of the locking disc structure of the present invention; Figure 16 Schematic diagram of the lifting block structure of the present invention; Figure 17 Schematic diagram of the movable plate structure of the present invention.

[0019] In the figure: 1, electric hoist; 2, traveling device; 3, connecting shaft; 4, overspeed detection mechanism; 401, reflective sheet; 402, infrared speed sensor; 403, control box; 404, air switch; 405, control contactor; 406, transformer; 407, speed controller; 408, rotating warning light; 409, knob switch; 5, braking mechanism; 501, disc brake; 502, electric caliper; 503, connecting pipe; 504, spiral plate; 505, water tank; 506, solenoid valve; 507, suspension assembly; 508, connecting plate; 6, speed reduction mechanism; 601, connecting wheel; 602, locking telescopic rod; 603, locking disc; 604, guide pipe; 605, pulling wire; 606, lifting block; 607, movable plate; 608, pulling spring; 609, ranging sensor. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0022] Embodiment 1: Please refer to Figures 1-9 , the present invention provides a technical solution: a metallurgical electric hoist overspeed protection device, including an electric hoist 1, a traveling device 2 is fixedly connected to the top of the electric hoist 1, a connecting shaft 3 is fixedly connected to the right side of the wire reel of the electric hoist 1, an overspeed detection mechanism 4 is fixedly connected to the right side of the wire reel of the electric hoist 1, a speed reduction mechanism 6 is fixedly connected to the outer wall of the connecting shaft 3, and a braking mechanism 5 is fixedly connected to the outer wall of the connecting shaft 3 on the right side of the speed reduction mechanism 6; The braking mechanism 5 includes: A disc brake disc 501, the disc brake disc 501 is fixedly connected to the right side of the connecting shaft 3; An electric caliper 502, the electric caliper 502 is arranged at the bottom of the disc brake disc 501; A water tank 505, the water tank 505 is arranged on the right side of the electric hoist 1.

[0023] The overspeed detection mechanism 4 includes a reflective sheet 401, several reflective sheets 401 are provided, the reflective sheets 401 are all fixedly connected to the right side of the wire reel of the electric hoist 1, and an infrared speed sensor 402 is fixedly connected to the right side of the reflective sheet 401 inside the electric hoist 1.

[0024] The infrared speed sensor 402 is an infrared reflection type, NPN type three-wire photoelectric switch, which is used in combination with the reflective sticker. When the drum is rotating, multiple reflective stickers will continuously irradiate the photoelectric switch, causing the photoelectric switch to generate a continuous pulse equivalent, and one reflective sticker can only be used as one induction point.

[0025] Debugging principle of the measurement and control tachometer: Unit of rotational speed (linear speed): M / min Rotational speed = frequency × circumference × 60 seconds ÷ pulse equivalent.

[0026] That is, N line = f.2πr × 60s ÷ p = C / T × 1min ÷ p = 120πrf / p N line is the linear speed.

[0027] If f = 50HZ, then T = 1 / f = 0.02S, C is the circumference, the unit is meters, T is the period, and it is the time taken to rotate one week.

[0028] p is the number of signals collected when the measured object or the motor rotates one week. Since one detection can be regarded as the motor rotating one week, the total rotational speed needs to be divided into several single quantities for collection.

[0029] The angular velocity ω = 2π / T = 360 / T = 2πf (degrees per second). When the measured object rotates one full circle, if too much time is taken to detect a single point, it will affect the frequency value. Additionally, the detection of the infrared photoelectric switch sensor and the number of reflective stickers at the detected point will also affect the accuracy of the detected value. Therefore, the debugging principle of the speed controller is as follows: First, calculate the actual value of the N line, and then reasonably adjust the pulse equivalent parameter values of the circumference and the measurement point of the measured object to make them match the calculated actual value.

[0030] When the rotation axis of the measured object is coaxial with the motor axis, then N line = n revolutions × c measurement, where n is the motor speed in revolutions per minute and c is the actual circumference of the measured point in meters. When the rotation axis of the measured object is non - coaxial with the motor axis through a speed - changing gear, then N line = n output × c measurement × i speed ratio, where n is the output shaft speed in revolutions per minute, c is the actual circumference of the measured point in meters, and i = n output speed / n input speed.

[0031] The overspeed detection mechanism 4 includes a control box 403. The control box 403 is electrically connected to the infrared speed sensor 402, the control box 403 is electrically connected to the braking mechanism 5, and the control box 403 is electrically connected to the speed - reducing mechanism 6.

[0032] On the outer wall of the control box 403, there is a fixed connection with a speed controller 407, a rotating warning light 408, and a knob switch 409. Inside the control box 403, there is a fixed connection with an air switch 404, a control contactor 405, and a transformer 406. The speed controller 407 can display the action speed and the running speed in real - time.

[0033] During operation, the air switch 404 needs to be closed, the transformer 406 is powered on, and then the knob switch 409 on the right side of the control box 403 is turned to the left. The speed controller 407 starts to work. The upper row of the display of the speed controller 407 shows the measured speed, and the lower row shows the set alarm speed. When the lifting speed of the electric hoist 1 stalls too quickly, it will cause the internal function relay of the speed controller 407 to act. At the same time, the control contactor 405 in the electrical box also acts, causing the rotating warning light 408 to emit an alarm signal. Thus, the power supply of the transformer 406 inside the control box 403 is also disconnected, making it act and sending signals to the braking mechanism 5 and the speed - reducing mechanism 6, so that they will not immediately descend rapidly, thereby avoiding dangerous accidents during use.

[0034] If the device malfunctions and needs to be repaired, the rotary switch 409 on the right side of the control box 403 can be turned to the right, and then the air switch 404 is turned off simultaneously to release the control. After the repair, the air switch 404 is turned on again, and the rotary switch 409 is turned to the left to restore the function.

[0035] Embodiment 2: Please refer to Figures 1-9 , based on Embodiment 1, the present invention provides a technical solution: A spiral plate 504 is fixedly connected inside the disc brake disc 501. A connecting pipe 503 is fixedly connected to the right side of the electric caliper 502 through a bearing. A solenoid valve 506 is fixedly connected to the top of the connecting pipe 503. The solenoid valve 506 is fixedly connected to the bottom of the water tank 505. A suspension assembly 507 is fixedly connected to the top of the water tank 505. A connecting plate 508 is fixedly connected to the left side of the suspension assembly 507. The connecting plate 508 is fixedly connected to the traveling device 2.

[0036] The water tank 505 is dragged by the traveling device 2 through the suspension assembly 507 and moves along the working guide rail together with the electric hoist 1.

[0037] When the overspeed detection mechanism 4 detects stall, it gives a signal to make the electric caliper 502 clamp the disc brake disc 501 to decelerate. At the same time, the solenoid valve 506 is opened. When the disc brake disc 501 rotates, the rotation of the spiral plate 504 causes the water inside the water tank 505 to enter the disc brake disc 501 through the connecting pipe 503 and then discharge from the holes on the disc brake disc 501 to dissipate heat from the disc brake disc 501. The faster the disc brake disc 501 rotates, the more heat is generated by friction, and at the same time, the more water is pumped by the disc brake disc 501 through the spiral plate 504, thereby realizing the adjustment of the water supply according to the speed.

[0038] Embodiment 3: Please refer to Figures 1-17 , based on Embodiments 1 and 2, the present invention provides a technical solution: The speed reduction mechanism 6 includes a connecting wheel 601. The connecting wheel 601 is movably connected to the outer wall of the connecting shaft 3 through a bearing. A locking telescopic rod 602 is fixedly connected to the right side of the connecting wheel 601. A locking disc 603 is fixedly connected to the outer wall of the connecting shaft 3 on the right side of the locking telescopic rod 602. A groove corresponding to the locking telescopic rod 602 is provided on the left side of the locking disc 603.

[0039] When stall is detected, the overspeed detection mechanism 4 gives a signal to the locking telescopic rod 602 to make the locking telescopic rod 602 extend. The extension of the locking telescopic rod 602 will snap into the corresponding groove on the locking disc 603, so that the locking disc 603 drives the connecting shaft 3 to rotate together with the connecting wheel 601 through the locking telescopic rod 602.

[0040] A guiding tube 604 is fixedly connected to the bottom of the electric hoist 1. A pulling wire 605 is fixedly connected to the bottom of the connecting wheel 601. A lifting block 606 is fixedly connected to the bottom of the pulling wire 605.

[0041] When the locking disc 603 rotates, it will wind up the pulling wire 605 and then lift the lifting block 606 upward from the bottom of the guiding tube 604. During the process of lifting the lifting block 606, part of the energy will be converted into the potential energy of the lifting block 606, thereby slowing down the speed of the hook of the electric hoist 1. When the lifting block 606 is lifted, the space at the top of the lifting block 606 will become smaller, and at the same time, part of the energy will act to push the gas inside the guiding tube 604 outward, so as to reduce the kinetic energy of the hook. At the same time, this part of the outflowing air flow will blow towards the disc brake disc 501 with water on its surface to promote the evaporation of the water on the surface of the disc brake disc 501 and better cool the disc brake disc 501.

[0042] Two movable plates 607 are movably connected inside the lifting block 606. A pulling spring 608 is fixedly connected to the bottom of the lifting block 606. The bottom of the pulling spring 608 is fixedly connected to the inner bottom of the guiding tube 604. A distance measuring sensor 609 is fixedly connected to the inner wall of the guiding tube 604 at the top of the pulling wire 605.

[0043] When the lifting block 606 is pulled up, the pulling spring 608 will be pulled up together. When the position of the lifting block 606 continuously moves close to the distance measuring sensor 609, the lifting block 606 will be sensed by the distance measuring sensor 609, and then the locking telescopic rod 602 will be temporarily retracted. At this time, the connecting wheel 601 will not be driven by the locking disc 603, and the connecting wheel 601 can rotate freely under the action of the bearing. The lifting block 606 will drive the locking disc 603 to rotate through the pulling wire 605 under the action of its own gravity and the pulling force of the distance measuring sensor 609. And during this process, the movable plate 607 will be pushed by the air flow to allow the air flow to pass through the lifting block 606 to reduce the air resistance received by the lifting block 606. When the lifting block 606 moves to the bottommost position, the connecting wheel 601 will be locked into the locking disc 603 through the locking telescopic rod 602 to lift the lifting block 606 again, so as to continuously convert the kinetic energy of the electric hoist 1 under the stall state.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A metallurgical electric hoist overspeed protection device, including an electric hoist (1), characterized in that: A traveling device (2) is fixedly connected to the top of the electric hoist (1). A connecting shaft (3) is fixedly connected to the right side of the wire reel of the electric hoist (1). An overspeed detection mechanism (4) is fixedly connected to the right side of the wire reel of the electric hoist (1). A speed reduction mechanism (6) is fixedly connected to the outer wall of the connecting shaft (3). A braking mechanism (5) is fixedly connected to the outer wall of the connecting shaft (3) on the right side of the speed reduction mechanism (6). The braking mechanism (5) includes: A disc brake disc (501), which is fixedly connected to the right side of the connecting shaft (3); An electric caliper (502), which is arranged at the bottom of the disc brake disc (501); A water tank (505), which is arranged on the right side of the electric hoist (1).

2. The overspeed protection device for a metallurgical electric hoist according to claim 1, characterized in that: The overspeed detection mechanism (4) includes a reflective sheet (401). There are several reflective sheets (401), and all the reflective sheets (401) are fixedly connected to the right side of the wire reel of the electric hoist (1). An infrared speed sensor (402) is fixedly connected inside the electric hoist (1) on the right side of the reflective sheet (401).

3. The overspeed protection device for a metallurgical electric hoist according to claim 1, characterized in that: The overspeed detection mechanism (4) includes a control box (403). The control box (403) is electrically connected to the infrared speed sensor (402), the control box (403) is electrically connected to the braking mechanism (5), and the control box (403) is electrically connected to the speed reduction mechanism (6).

4. A speed limit protection device for a metallurgical electric hoist according to claim 1, characterized in that: A speed controller (407) is fixedly connected to the outer wall of the control box (403). A rotating warning light (408) is fixedly connected to the outer wall of the control box (403). A knob switch (409) is fixedly connected to the outer wall of the control box (403). An air switch (404) is fixedly connected inside the control box (403). A control contactor (405) is fixedly connected inside the control box (403). A transformer (406) is fixedly connected inside the control box (403).

5. The overspeed protection device for a metallurgical electric hoist according to claim 1, characterized in that: A spiral plate (504) is fixedly connected inside the disc brake disc (501). A connecting pipe (503) is fixedly connected to the right side of the electric caliper (502) through a bearing. A solenoid valve (506) is fixedly connected to the top of the connecting pipe (503). The solenoid valve (506) is fixedly connected to the bottom of the water tank (505). A suspension assembly (507) is fixedly connected to the top of the water tank (505). A connecting plate (508) is fixedly connected to the left side of the suspension assembly (507). The connecting plate (508) is fixedly connected to the traveling device (2).

6. The overspeed protection device for a metallurgical electric hoist according to claim 1, characterized in that: The speed reduction mechanism (6) includes a connecting wheel (601). The connecting wheel (601) is movably connected to the outer wall of the connecting shaft (3) through a bearing. A locking telescopic rod (602) is fixedly connected to the right side of the connecting wheel (601). A locking disc (603) is fixedly connected to the outer wall of the connecting shaft (3) on the right side of the locking telescopic rod (602). A groove corresponding to the locking telescopic rod (602) is arranged on the left side of the locking disc (603).

7. The overspeed protection device for a metallurgical electric hoist according to claim 6, characterized in that: The bottom of the electric hoist (1) is fixedly connected with a guide pipe (604). The bottom of the connecting wheel (601) is fixedly connected with a pulling wire (605). The bottom of the pulling wire (605) is fixedly connected with a lifting block (606).

8. A metallurgical electric hoist overspeed protection device according to claim 7, characterized in that: Two movable plates (607) are movably connected inside the lifting block (606). The bottom of the lifting block (606) is fixedly connected with a pulling spring (608). The bottom of the pulling spring (608) is fixedly connected with the inner bottom of the guide pipe (604). A distance measuring sensor (609) is fixedly connected to the inner wall of the guide pipe (604) at the top of the pulling wire (605).

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