An elevator overloading detection device and feedback control system

Abstract

The application provides a kind of freight elevator overweight detection equipment and feedback control system, including freight elevator, the freight elevator includes external frame, guide rail, box and support pad, the bottom of the box inner chamber is clamped with bottom plate, the bottom of the external frame inner chamber is equipped with detection structure.The application is to solve the problem that the existing freight elevator in the prior art detects the weight of the object in the freight elevator by setting weight sensors at the four corners of the bottom plate of the freight elevator, when the goods in the freight elevator are placed and the weight is tilted to a corner, it is easy to cause the alarm system of the freight elevator to issue false alarm, thereby affecting the normal use of the freight elevator.The application supports the four corners of the conducting plate at the bottom of the freight elevator by setting a crowbar and a top plate, and converts the detection point of the weight from the four corners to the middle of the bottom plate, and at the same time utilizes the principle of lever, so that the detection reaction is more sensitive, and the effect of preventing false alarm and increasing detection sensitivity is realized.

Description

Technical Field

[0001] This invention relates to the field of freight elevator safety, and more specifically, to a freight elevator overload detection device and a feedback control system. Background Technology

[0002] Freight elevators, as a type of dedicated elevator for transporting goods, are essential equipment in major shopping malls and office buildings. By separating and transporting goods from people, freight elevators ensure smooth transportation and safety. Therefore, the presence of freight elevators is very necessary in places with high personnel flow, such as shopping malls and office buildings.

[0003] Freight elevators in office buildings are typically used to transport building materials for decoration, so they need to bear a large weight. Existing freight elevators use weight sensors installed at the four corners of the elevator floor to detect the weight of objects inside. When the weight of the goods in the elevator is tilted to a certain corner, it can easily cause the elevator's alarm system to issue a false alarm, thus affecting the normal use of the elevator.

[0004] Therefore, we have made improvements to this by proposing an overload detection device and feedback control system for freight elevators. Summary of the Invention

[0005] The purpose of this invention is to address the issue that in existing freight elevators, weight sensors are installed at the four corners of the elevator's base to detect the weight of objects inside. When the weight of goods in the elevator is tilted to a certain corner, it can easily cause the elevator's alarm system to issue a false alarm, thus affecting the normal use of the elevator.

[0006] To achieve the above-mentioned objectives, the present invention provides a freight elevator overload detection device and a feedback control system to improve the aforementioned problems.

[0007] The application is as follows:

[0008] An overload detection device for a freight elevator includes a freight elevator comprising an external frame, guide rails, a housing, and support pads. A base plate is snapped into the bottom of the housing's inner cavity. A detection structure is provided at the bottom of the inner cavity of the external frame. The detection structure includes a support plate and a transmission plate. Four weight sensors are fixedly mounted at equal angles on the top of the transmission plate, and the weight sensors are attached to the bottom of the base plate. Pry bars are movably hinged to the bottom of all four sides of the housing. The inner ends of the pry bars are supported on the outer bottom of the transmission plate. Four support plates are provided at the bottom of the housing's inner cavity, and the inner arc surfaces of the pry bars are supported on the outer sides of the support plates. A support structure is provided at the bottom of the support plates. Support pads are located at the four corners of the bottom of the housing, simultaneously supporting the four corners of both the housing and the base plate.

[0009] As a preferred technical solution of this application, the detection structure includes four support plates, two of which are fixedly installed at the front and rear ends of the bottom of the inner cavity of the box, and the other two support plates are slidably engaged on both sides of the bottom of the box and can rotate, with the inner ends of the support plates engaged on the top of the support structure.

[0010] As a preferred technical solution of this application, the support structure includes a top plate, a flip groove and a through groove. The support structure can rotate 90 degrees counterclockwise. The front and rear ends of the top plate are provided with flip grooves. A pair of through grooves are provided on the left side of the top plate. The bottom of the top plate is provided with a fixing structure.

[0011] As a preferred technical solution of this application, the fixing structure includes a fixing groove, a torsion spring is fixedly installed at the bottom of the inner cavity of the fixing groove, four fixing holes are opened at equal angles at the bottom of the inner cavity of the fixing groove, four electromagnet fixing blocks are fixedly installed at equal angles at the bottom of the top plate, a locking block is fixedly installed on the side of the electromagnet fixing block on the front of the box, an electromagnetic ring is rotatably engaged at the bottom of the box, a positioning rod is fixedly installed at equal angles on the top of the electromagnetic ring, the positioning rod and the electromagnet fixing block are engaged with each other, and the electromagnetic ring is located at the top of the air duct.

[0012] As a preferred technical solution of this application, the bottom of the fixing structure is provided with a detachment structure, the detachment structure includes a duct and a sleeve, a magnet is fixedly installed on the top of the duct, a pair of fixing plates are fixedly installed on the top of the inner cavity of the duct, the sleeve is threaded between the two fixing plates, a wind plate is slidably fitted on the middle of the sleeve, cutters are fixedly installed on both sides of the top of the wind plate, a pair of guide rods are symmetrically fitted on the middle of the wind plate, the top of the guide rods is fixedly installed on the top of the inner cavity of the duct, wire holes are opened on both sides of the duct, and cutting grooves are opened on both sides of the sleeve, the wire holes and the cutting grooves are on the same plane.

[0013] As a preferred technical solution of this application, the bottom end of each guide rod is movably hinged with a hook, a pair of limiting rods are fixedly installed at the bottom of the wind plate, the limiting rods are vertically engaged in the middle of the hooks, a compensation chain is hung in the middle of the two hooks, and buffer structures are provided on both sides of the disengagement structure.

[0014] As a preferred technical solution of this application, the buffer structure includes a blade and a friction block. The blade is fixedly connected to the bottom of the support plate on the same side. A slot is provided in the middle of the bottom end of the blade. A flap is movably engaged at the top of the slot. The bottom end of the flap is attached to the side of the guide rail. The top end of the friction block is slidably engaged at the bottom of the housing. The top end of the flap contacts the bottom of the inner end of the friction block.

[0015] As a preferred technical solution of this application, the front of the two buffer structures is provided with a protective structure, which includes a baffle and a tension plate. The top of the baffle is fixedly installed at the bottom of the front of the box. A pair of limiting grooves are vertically opened on the inner side of the baffle. Guide sleeves are fixedly installed on both sides of the baffle. The tension plate is slidably engaged with the inner side of the guide sleeve. A pair of fixing rods are fixedly installed at the top of the tension plate. The top of the fixing rods is slidably engaged with the inside of the limiting groove.

[0016] A freight elevator overload detection feedback control system, wherein the detection structure includes a weight sensor and an information control center, and the information control center is wired to an alarm circuit, a data receiving module, a data processing module, a data storage module, an information sending module, a server terminal, and a wireless communication module.

[0017] As a preferred technical solution of this application, the weight sensor feeds back the detected data to the information control center. The information control center receives the information through a data receiving module, stores it through a data storage module, and feeds the data back to the data processing module of the information control center through an information sending module. After processing the data, the data processing module controls whether the alarm circuit works through the information control center and sends the data to the server terminal through a wireless communication module.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In the scheme of this application:

[0020] 1. To address the problem in existing freight elevators where weight sensors are installed at the four corners of the elevator floor to detect the weight of objects inside, which can easily cause false alarms when the weight of goods shifts to a certain corner, thus affecting the normal use of the elevator, this application proposes a solution. This solution uses pry bars and a top plate to support the four corners of the elevator's bottom transmission plate, shifting the weight detection point from the four corners to the center of the floor. Utilizing the lever principle, the detection response becomes more sensitive, preventing false alarms while increasing detection sensitivity.

[0021] 2. In order to solve the problem in the prior art that when a freight elevator gets stuck in the shaft in the event of a sudden power outage or shutdown, and during rescue operations, workers are prone to fall through the gap between the freight elevator and the space below, this application provides a protective structure. The tension plate in the protective structure slides down to the bottom of the baffle, extending the height of the protective structure and thus protecting the bottom and the space below the freight elevator, preventing workers from falling below the elevator.

[0022] 3. By cooperating with the detection structure and the bottom support structure, when an emergency fall occurs at low altitude, the arc-shaped pry bar and the support plate will deform when they are squeezed together, converting the force of the fall into the force in the horizontal direction. This can play a certain role in buffering the freight elevator during an emergency fall, thereby protecting the people and objects in the freight elevator. This solves the problem in the existing technology that the freight elevator directly contacts the bottom buffer component during an emergency fall, resulting in poor protection and easy injury to personnel.

[0023] 4. A compensation chain is suspended at the bottom of the detachment structure. When the freight elevator falls urgently from a height, the air vane in the detachment structure will rise relative to the sleeve in the air duct under the action of wind resistance, thereby opening the hook of the suspension compensation chain and causing the compensation chain to detach. This achieves the goal of increasing the pulling force at the upper end of the freight elevator after the compensation chain detaches, thereby slowing down the descent speed of the freight elevator. This solves the problem in the prior art that the acceleration due to gravity cannot be reduced when the freight elevator falls from a height.

[0024] 5. When the cutter on the top of the wind vane in the detachment structure moves up, it cuts the wire connected to the electromagnet. At this time, the electromagnet is de-energized, causing the positioning rod at its top to detach from the fixing block at the bottom of the top plate. Under the action of the torsion spring, the top plate will rotate 90 degrees counterclockwise, causing the flip grooves at the front and rear ends of the top plate to rotate to both sides. At this time, the support plates on both sides will automatically flip and tilt when they lose support. Under the action of wind force, the blades will automatically slide to both sides to increase the wind resistance of the freight elevator. This achieves a deceleration effect in the relatively narrow shaft when the freight elevator falls, thereby reducing the speed of the freight elevator's descent.

[0025] 6. By using a flap located in the middle of the blade, the flap automatically squeezes against the guide rails on both sides and increases friction when the blade slides to both sides. At the same time, the flap pushes the friction block at the top to both sides, thereby increasing the friction between the friction block and the guide rail, which achieves the effect of slowing down the descent of the freight elevator, thereby further reducing the speed of the freight elevator when it falls. Attached Figure Description

[0026] Figure 1 This application provides a structural schematic diagram of an overload detection device for freight elevators.

[0027] Figure 2 This application provides a frontal disassembly diagram of a freight elevator overload detection device.

[0028] Figure 3 This application provides a front sectional view of a freight elevator overload detection device.

[0029] Figure 4 This application provides a freight elevator overload detection device. Figure 3A magnified structural diagram at point A;

[0030] Figure 5 A schematic diagram of the bottom structure of the inner cavity of a freight elevator overload detection device provided in this application;

[0031] Figure 6 This application provides a schematic diagram of the internal structure of a freight elevator overload detection device.

[0032] Figure 7 This application provides a schematic diagram of the top structure of the top plate of an overload detection device for freight elevators.

[0033] Figure 8 This application provides a schematic diagram of the top and bottom structure of an overload detection device for freight elevators.

[0034] Figure 9 This application provides a schematic diagram of the detachment structure of an overload detection device for freight elevators.

[0035] Figure 10 This application provides a schematic diagram of the top structure of the detachment structure of an overload detection device for freight elevators.

[0036] Figure 11 This application provides a schematic diagram of the protective structure of an overload detection device for freight elevators.

[0037] Figure 12 A schematic diagram of an overload detection feedback control system for a freight elevator provided in this application.

[0038] The image shows:

[0039] 1. Freight elevator; 101. External frame; 102. Guide rail; 103. Cabin; 104. Clearance groove; 105. Base plate; 106. Support pad;

[0040] 2. Buffer structure; 201. Blade; 202. Slot; 203. Flip plate; 204. Friction block;

[0041] 3. Protective structure; 301. Baffle; 302. Limiting groove; 303. Tension plate; 304. Fixing rod; 305. Guide sleeve;

[0042] 4. Detection structure; 401. Conducting plate; 402. Pry bar; 403. Support plate; 404. Weight sensor;

[0043] 5. Detachment structure; 501. Air duct; 502. Sleeve; 503. Guide rod; 504. Air vane; 505. Cutter; 506. Wire hole; 507. Fixing plate; 508. Limiting rod; 509. Hook; 510. Cutting groove; 511. Magnet;

[0044] 6. Supporting structure; 601. Top plate; 602. Tilting groove; 603. Penetrating groove;

[0045] 7. Fixing structure; 701. Fixing groove; 702. Fixing hole; 703. Torsion spring; 704. Limiting block; 705. Electromagnetic ring; 706. Positioning rod; 707. Electromagnetic fixing block; 708. Locking block. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] As described in the background section, when the weight of goods placed in a freight elevator tilts to a certain corner, it can easily cause the elevator's alarm system to issue a false alarm, thereby affecting the normal use of the freight elevator.

[0048] To address this technical problem, the present invention provides a freight elevator overload detection device and a feedback control system, which are applied to freight elevator overload detection.

[0049] For details, please refer to Figure 1-3 The freight elevator overload detection equipment specifically includes a freight elevator 1, which comprises an outer frame 101, guide rails 102, a housing 103, and a support pad 106. A base plate 105 is snapped into the bottom of the inner cavity of the housing 103. A detection structure 4 is provided at the bottom of the inner cavity of the outer frame 101. The detection structure 4 includes a support plate 403 and a transmission plate 401. Four weight sensors 404 are fixedly mounted at equal angles on the top of the transmission plate 401, and the weight sensors 404 are attached to the base plate 106. At the bottom of box 103, pry bars 402 are movably hinged to all four sides. The inner end of the pry bar 402 is supported on the outer bottom of the transmission plate 401. Four support plates 403 are provided at the bottom of the inner cavity of box 103. The inner arc surface of the pry bar 402 is supported on the outer side of the support plate 403. The bottom of the support plate 403 is provided with a support structure 6. The support pads 106 are located at the four corners of the bottom of box 103 and simultaneously support the four corners of box 103 and bottom plate 105.

[0050] The present invention provides an overload detection device for freight elevators. By setting up pry bars and top plates to support the four corners of the transmission plate at the bottom of the freight elevator, the weight detection point is shifted from the four corners to the middle of the bottom plate. At the same time, by utilizing the principle of leverage, the detection response can be made more sensitive, thus preventing false alarms and increasing detection sensitivity.

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0052] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0053] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0054] Example 1

[0055] Please refer to Figure 2 and Figure 3 An overload detection device for freight elevators includes a detection structure 4 containing four support plates 403. Two support plates 403 are fixedly installed at the front and rear ends of the bottom of the inner cavity of the housing 103, while the other two support plates 403 are slidably engaged on both sides of the bottom of the housing 103 and can rotate. The inner ends of the support plates 403 are engaged on the top of the support structure 6. When all the support plates 403 are fixed at the bottom of the inner cavity of the housing 103, when the freight elevator experiences an emergency drop at low altitude, the compression between the support plates 403 and the pry bar 402 causes the bent support plates 403 and the pry bar 402 to stretch simultaneously, thereby converting the vertical drop force into a horizontal force and reducing the impact force on the bottom when the freight elevator drops.

[0056] This invention provides a certain degree of cushioning during an emergency descent of the freight elevator, thereby protecting people and objects inside. It solves the problem in existing technologies where the freight elevator directly contacts the bottom cushioning components during an emergency descent, resulting in poor protection and potential injury.

[0057] Please refer to Figure 6 , Figure 7 and Figure 8An overload detection device for a freight elevator includes a support structure 6 comprising a top plate 601, a tilting groove 602, and a penetrating groove 603. The support structure 6 can rotate 90 degrees counterclockwise. The top plate 601 has tilting grooves 602 at both its front and rear ends, and a pair of penetrating grooves 603 on its left side. The bottom of the top plate 601 has a fixing structure 7. The top plate 601 can support the inner end of the support plate 403, thereby ensuring the normal operation of the detection structure. When the elevator is powered off, the bottom of the top plate 601 is unrestrained. At this time, the top plate 601 will rotate 90 degrees under the action of the torsion spring 703, so that the two tilting grooves 602 on the surface of the top plate 601 can align with the support plates 403 on both sides, thereby allowing the support plates 403 on both sides to tilt. At the same time, the penetrating grooves 603 will align with the fixing rods 304, thereby facilitating the opening of the protective structure.

[0058] In the event of a power outage, the top plate 601 will automatically rotate 90 degrees counterclockwise under the action of the torsion spring 703, thereby allowing the flip groove 602 and the through groove 603 on the top plate 601 to align with the support plate 403 and the fixing rod 304. This will cause the support plates 403 on both sides to be unrestricted, making it easier for the blade 201 to slide to the side and increase the wind resistance during descent. At the same time, when the fixing rod 304 aligns with the through groove 603, the tension plate 303 on the inner side of the baffle 301 will automatically descend and extend the length of the baffle 301, thus protecting the maintenance personnel.

[0059] Example 2

[0060] The freight elevator overload detection equipment provided in Example 1 has been further optimized, specifically, as follows: Figure 4 , Figure 5 and Figure 8As shown, the fixing structure 7 includes a fixing groove 701. A torsion spring 703 is fixedly installed at the bottom of the inner cavity of the fixing groove 701. Four fixing holes 702 are equally spaced at the bottom of the inner cavity of the fixing groove 701. Four electromagnet fixing blocks 707 are equally spaced at the bottom of the top plate 601. A locking block 708 is fixedly installed on the side of the electromagnet fixing block 707 on the front of the housing 103. A solenoid ring 705 is rotatably engaged at the bottom of the housing 103. A positioning rod 706 is equally spaced fixedly installed on the top of the solenoid ring 705. The positioning rod 706 engages with the electromagnet fixing block 707. The solenoid ring 705 is located at the top of the air duct 501. When the unit is in normal operation, the electromagnetic ring 705 will have a magnetic force when energized and will attract each other to the top plate 601. The positioning rod 706 on the top of the electromagnetic ring 705 will be inserted into the fixing hole 702 at the bottom of the housing 103 and will engage with the locking block 708 at the bottom of the top plate 601, thereby fixing the top plate 601. When the electromagnetic ring 705 is de-energized, the electromagnetic ring 705 loses its magnetic force. At this time, the top of the air duct 501 will generate a magnetic attraction to it, causing the electromagnetic ring 705 to fall automatically under the action of gravity and magnetic attraction. At this time, the locking block 708 at the bottom of the top plate 601 will be unrestricted, thereby allowing the top plate 601 to rotate.

[0061] The rotation and fixation of the top plate 601 are controlled by the electromagnetic ring 705. The electromagnetic ring 705 and the electromagnet fixing block 707 are simultaneously energized and attract each other, thereby fixing the top plate 601. This not only supports the support plate 403 and the detection structure 4, but also protects the falling freight elevator 1 after the top plate 601 rotates. By increasing the wind resistance, the gravitational acceleration of the freight elevator is reduced. The length of the baffle 301 is increased by the tension plate 303, thereby enhancing the protection and preventing rescuers and rescued personnel from falling into the gap between the freight elevator and its bottom.

[0062] Furthermore, such as Figure 2 , Figure 3 and Figure 6As shown, the buffer structure 2 includes a blade 201 and a friction block 204. The blade 201 is fixedly connected to the bottom of the support plate 403 on the same side. A slot 202 is provided in the middle of the bottom end of the blade 201. A flap 203 is movably engaged at the top of the slot 202. The bottom end of the flap 203 is attached to the side of the guide rail 102. The top of the friction block 204 is slidably engaged at the bottom of the housing 103. The top of the flap 203 contacts the bottom of the inner end of the friction block 204. The blade 201 is connected to the guide rail 102 through the slot 202 in the middle. When the blade 201 slides to both sides under the action of wind resistance, the blade 201 will increase the area of ​​the bottom of the freight elevator. At the same time, the blade 201 is tilted outward and downward, squeezing the wind downward, thereby further increasing the wind resistance at the bottom of the freight elevator. In addition, the space in the shaft is small, so the space at the bottom of the freight elevator loses relatively less air, thereby further increasing the wind resistance of the freight elevator.

[0063] By sliding the blades 201 to both sides, the cross-sectional area of ​​the bottom of the freight elevator is increased. At the same time, the blades 201 are used to push the air downward, so that the air flows between the bottom of the blades 201 and the bottom of the shaft. In turn, the air resistance provides some support to the bottom of the freight elevator and reduces the acceleration of the freight elevator.

[0064] Example 3

[0065] The freight elevator overload detection equipment provided in Embodiment 1 or 2 is further optimized, specifically, as follows: Figure 3 and Figure 4 As shown, the bottom of the fixed structure 7 is provided with a detachment structure 5, which includes a duct 501 and a sleeve 502. A magnet 511 is fixedly installed on the top of the duct 501. A pair of fixing plates 507 are fixedly installed on the top of the inner cavity of the duct 501. The sleeve 502 is threaded between the two fixing plates 507. A wind plate 504 is slidably fitted in the middle of the sleeve 502. Cutters 505 are fixedly installed on both sides of the top of the wind plate 504. A pair of guide rods 503 are symmetrically fitted in the middle of the wind plate 504. The top ends of the guide rods 503 are fixedly installed on the top of the inner cavity of the duct 501. Wire holes 506 are opened on both sides of the duct 501. Both sides of the elevator are provided with cutting grooves 510. The wire hole 506 is on the same plane as the cutting groove 510. During the fall of the elevator, when the fall reaches a certain speed, the wind plate 504 at the bottom of the air duct 501 will move upward towards the relative sleeve 502 due to wind resistance. At this time, the cutters 505 on both sides of the top of the wind plate 504 will cut the wires connected to the electromagnetic ring 705 passing through the cutting groove 510, thereby causing the electromagnetic ring 705 to lose its magnetism. At this time, the electromagnetic ring 705 will automatically fall under the action of the magnetic force at the top of the air duct 501, thereby causing the support structure 6 to rotate under the action of the torsion spring 703, and thus causing the buffer structure 2 and the protective structure 3 to open.

[0066] By setting up the detachment structure 5, when the freight elevator falls at excessive speed, the wind plate 504 in the detachment structure 5 is subject to wind resistance, and the traction cutter 505 automatically cuts the wire on the electromagnetic ring 705, thereby playing a power-off self-protection role and preventing the elevator from still having power during the elevator fall, which would cause the protective structure and buffer structure to fail to open automatically.

[0067] Furthermore, such as Figure 9 As shown, hooks 509 are movably hinged to the bottom of the guide rod 503. A pair of limiting rods 508 are fixedly installed at the bottom of the air plate 504. The limiting rods 508 are vertically engaged with the middle of the hooks 509. A compensation chain is hung in the middle of the two hooks 509. Buffer structures 2 are provided on both sides of the detachment structure 5. One end of the compensation chain is suspended by the hooks 509 movably hinged to the bottom of the guide rod 503. The limiting rods 508 at the bottom of the air plate 504 limit the hooks 509 to prevent them from rotating in their natural state. When the freight elevator drops rapidly, the air plate 504 will move upward relative to the air duct 501 due to wind resistance. The descent speed of the air plate 504 is lower than that of the air duct 501, so that the bottom of the limiting rod 508 disengages from the middle of the hook 509. At this time, the compensation chain can be disengaged.

[0068] By detaching the compensating chain from the top of hook 509, and since the other end of hook 509 is connected to the counterweight block connected to the top of the freight elevator, the compensating chain is now completely suspended on the counterweight block. This increases the weight of the counterweight block, thereby increasing the tension on the top of the freight elevator and reducing the acceleration of the elevator's descent. The compensating chain primarily compensates for the weight of the traction steel wire rope. When the elevator is on the top floor, most of the weight of the steel wire rope is on the counterweight side; when the elevator is on the bottom floor, most of the weight of the steel wire rope is on the car side. The weight position of the steel wire rope changes continuously as the elevator moves up and down, affecting the weight balance of the traction elevator. The function of the compensating chain is to compensate for the traction imbalance caused by the movement of the steel wire rope weight. When the steel wire rope moves towards the counterweight side, the compensating chain moves with the car to compensate; when the steel wire rope moves towards the car side, the compensating chain moves with the counterweight to the counterweight side, making the elevator run more smoothly.

[0069] Furthermore, such as Figure 1 and Figure 11As shown, the front of the two buffer structures 2 is provided with a protective structure 3. The protective structure 3 includes a baffle 301 and a tension plate 303. The top of the baffle 301 is fixedly installed at the bottom of the front of the housing 103. A pair of limiting grooves 302 are vertically opened on the inner side of the baffle 301. Guide sleeves 305 are fixedly installed on both sides of the baffle 301. The tension plate 303 is slidably engaged with the inner side of the guide sleeves 305. A pair of fixing rods 304 are fixedly installed on the top of the tension plate 303. The top of the fixing rods 304 is slidably engaged with the inside of the limiting grooves 302. The support structure 6 restricts the tension plate 303 inside the protective structure 3, allowing the tension plate 303 to slide downward inside the baffle 301. When the freight elevator stops and gets stuck between two adjacent exits in the shaft, the solenoid ring 705 is de-energized, causing the top plate 601 to rotate. This allows the fixing rod 304 at the top of the tension plate 303 inside the baffle 301 to pass through the through groove 603 on the top plate 601, extending the length of the baffle 301 through the tension plate 303, thereby protecting maintenance personnel and people escaping from the elevator.

[0070] The extended tension plate 303 covers the gap between the bottom of the freight elevator and the shaft, thereby preventing rescue personnel and installation personnel from accidentally falling into the shaft in the event of an emergency.

[0071] Example 4

[0072] Please refer to Figure 12 A freight elevator overload detection feedback control system is disclosed. Its detection structure 4 includes a weight sensor 404 and an information control center. The information control center is wired to an alarm circuit, a data receiving module, a data processing module, a data storage module, an information sending module, a server terminal, and a wireless communication module. The weight sensor 404 feeds back the detected data to the information control center. The information control center receives the information through the data receiving module, stores it through the data storage module, and feeds it back to the data processing module through the information sending module. After processing the data, the data processing module controls the alarm circuit to operate through the information control center and sends the data to the server terminal through the wireless communication module.

[0073] The overload detection feedback control system can effectively improve staff's understanding of the freight elevator's operating status and ensure the safety of the freight elevator's operation.

[0074] The usage process of the freight elevator overload detection device and feedback control system provided by this invention is as follows:

[0075] In normal operation, when the freight elevator stops and loading is being done, the goods are placed directly on the bottom plate 105 at the bottom of the inner cavity of the box 103. The bottom plate 105 supports the goods. At this time, the box 103 and the bottom plate 105 transfer the overall weight to the support plate 403 through the pry bar 402. The support plate 403 supports the pry bar 402, thereby transferring the weight to the inner end of the pry bar 402. The inner end of the pry bar 402 compresses the transmission plate 401, thereby concentrating the weight from all sides to the middle of the bottom plate 105. The weight of the goods is detected by the compression between the transmission plate 401 and the weight sensor 404.

[0076] When the freight elevator stops and gets stuck between two adjacent exits during operation, the power is cut off to demagnetize the electromagnetic ring 705. Under the influence of gravity and the magnetic attraction of the bottom ventilation duct 501, the electromagnetic ring 705 detaches from the bottom of the housing 103. The support pad 106 on top of the electromagnetic ring 705 is removed from the side of the locking block 708 at the bottom of the top plate 601. Under the action of the torsion spring 703, the top plate 601 rotates 90 degrees counterclockwise. At this time, when the protective structure 3 on the front of the housing 103 connects with the fixed rod 304 through the slot 603, the tension plate 303 extends downward inside the baffle 301, thereby blocking the gap between the bottom of the freight elevator and the shaft, preventing workers and rescued personnel from falling to the bottom of the shaft.

[0077] When the top steel wire rope of the freight elevator breaks and it suddenly falls, if the fall distance is short and the freight elevator comes into contact with the bottom buffer device at the moment, the arc-shaped support plate 403 and the pry bar 402 come into direct contact and squeeze each other to unfold the arc, thereby converting the vertical force into a horizontal force, thus protecting the goods and personnel inside the box 103.

[0078] When the fall distance is high, the speed of the freight elevator increases continuously during the descent. At this time, the air vane 504 in the middle of the air duct 501 at the bottom of the outer frame 101 moves upward relative to the sleeve 502 due to wind resistance. This causes the air vane 504, along with the cutter 505, to move upward and cut the wire connected to the electromagnetic ring 705 through the cutting groove 510. At this time, the electromagnetic ring 705 loses its magnetism and is simultaneously attracted downward by the magnetism at the top of the air duct 501. This causes the electromagnetic ring 705 to detach from the bottom of the housing 103, thereby causing the positioning rod 706 to detach from the bottom of the top plate 601. When the electromagnet fixing block 707 separates, the top plate 601 rotates, thereby unfolding the protective structure 3. At the same time, the support plates 403 on both sides can rotate after losing the support of the top plate 601, so that the blade 201 moves to both sides under the action of wind force. By using wind resistance to increase the wind force at the bottom of the outer frame 101, the overall gravitational acceleration of the freight elevator is reduced. At the same time, as the blade 201 moves outward, it will squeeze the friction block 204 outward through the flip plate 203, thereby increasing the friction between the friction block 204 and the guide rail 102, further reducing the gravitational acceleration of the freight elevator.

[0079] A compensating chain is suspended at the bottom of the detached structure 5 via a hinged hook 509. The compensating chain compensates for the weight difference between the elevator and the counterweight, thus ensuring the smooth operation of the elevator. When the air deflector 504 loses weight, it can rise relative to the sleeve 502 due to wind resistance, causing the limit rod 508 to disengage from the middle of the hook 509. This allows the hook 509 to open downwards, and the compensating chain will disengage from the middle of the hook 509, thereby increasing the weight of the counterweight and decreasing the weight of the elevator. This helps to mitigate the elevator's descent.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A freight elevator overload detection device, characterized in that, The system includes a freight elevator (1), which comprises an outer frame (101), guide rails (102), a housing (103), and a support pad (106). A base plate (105) is snapped into the bottom of the inner cavity of the housing (103). A detection structure (4) is provided at the bottom of the inner cavity of the outer frame (101). The detection structure (4) comprises a support plate (403) and a transmission plate (401). Four weight sensors (404) are fixedly mounted at equal angles on the top of the transmission plate (401). The weight sensors (404) are attached to the base plate (105). At the bottom, pry bars (402) are movably hinged to the bottom of the box (103) around all four sides. The inner end of the pry bar (402) is supported on the outer side of the bottom of the transmission plate (401). Four support plates (403) are provided at the bottom of the inner cavity of the box (103). The inner arc surface of the pry bar (402) is supported on the outer side of the support plate (403). The bottom of the support plate (403) is provided with a support structure (6). The support pad (106) is located at the four corners of the bottom of the box (103) and simultaneously supports the four corners of the box (103) and the bottom plate (105). The supporting structure (6) includes a top plate (601), and a fixing structure (7) is provided at the bottom of the top plate (601). The fixing structure (7) includes a fixing groove (701), a torsion spring (703) is fixedly installed at the bottom of the inner cavity of the fixing groove (701), four fixing holes (702) are opened at equal angles at the bottom of the inner cavity of the fixing groove (701), four electromagnet fixing blocks (707) are fixedly installed at equal angles at the bottom of the top plate (601), a locking block (708) is fixedly installed on the side of the electromagnet fixing block (707) on the front of the box body (103), an electromagnetic ring (705) is rotatably locked at the bottom of the box body (103), and a positioning rod (706) is fixedly installed at equal angles at the top of the electromagnetic ring (705), and the positioning rod (706) and the electromagnet fixing block (707) are locked together. The bottom of the fixed structure (7) is provided with a release structure (5), which includes a duct (501) and a sleeve (502). A magnet (511) is fixedly installed on the top of the duct (501), and a pair of fixing plates (507) are fixedly installed on the top of the inner cavity of the duct (501). The sleeve (502) is threaded between the two fixing plates (507). A wind plate (504) is slidably fitted in the middle of the sleeve (502). Cutters (505) are fixedly installed on both sides of the top of the wind plate (504). A pair of guide rods (503) are symmetrically fitted in the middle of the wind plate (504). The top of the sleeve (502) is fixedly installed on the top of the inner cavity of the air duct (501). The air duct (501) has wire holes (506) on both sides. The sleeve (502) has cutting grooves (510) on both sides. The wire holes (506) and cutting grooves (510) are on the same plane. The bottom of the guide rod (503) is movably hinged with hooks (509). The bottom of the air plate (504) is fixedly installed with a pair of limiting rods (508). The limiting rods (508) are vertically locked in the middle of the hooks (509). The middle of the two hooks (509) is hung with a compensation chain. The electromagnetic ring (705) is located at the top of the air duct (501).

2. The freight elevator overload detection device according to claim 1, characterized in that, The detection structure (4) includes four support plates (403), two of which are fixedly installed at the front and rear ends of the bottom of the inner cavity of the box (103), and the other two support plates (403) are slidably engaged on both sides of the bottom of the box (103). The support plates (403) can rotate and engage the inner ends of the support plates (403) with the top of the support structure (6).

3. The freight elevator overload detection device according to claim 1, characterized in that, The support structure (6) can rotate 90 degrees counterclockwise. The front and rear ends of the top plate (601) are provided with flip grooves (602), and the left side of the top plate (601) is provided with a pair of through grooves (603).

4. The freight elevator overload detection device according to claim 2, characterized in that, Both sides of the detachment structure (5) are provided with buffer structures (2).

5. The freight elevator overload detection device according to claim 4, characterized in that, The buffer structure (2) includes a blade (201) and a friction block (204). The blade (201) is fixedly connected to the bottom of the support plate (403) on the side. A slot (202) is provided in the middle of the bottom end of the blade (201). A flap (203) is movably engaged at the top of the slot (202). The bottom end of the flap (203) is attached to the side of the guide rail (102). The top end of the friction block (204) is slidably engaged at the bottom of the housing (103). The top end of the flap (203) contacts the bottom of the inner end of the friction block (204).

6. The freight elevator overload detection device according to claim 5, characterized in that, The front of the two buffer structures (2) is provided with a protective structure (3). The protective structure (3) includes a baffle (301) and a tension plate (303). The top of the baffle (301) is fixedly installed at the bottom of the front of the box (103). A pair of limiting grooves (302) are vertically opened on the inner side of the baffle (301). Guide sleeves (305) are fixedly installed on both sides of the baffle (301). The tension plate (303) is slidably engaged with the inner side of the guide sleeve (305). A pair of fixing rods (304) are fixedly installed on the top of the tension plate (303). The top of the fixing rods (304) is slidably engaged with the inside of the limiting grooves (302).

7. A freight elevator overload detection feedback control system, using the freight elevator overload detection equipment as described in claim 1, characterized in that, The detection structure (4) includes a server terminal, a weight sensor (404), and an information control center. The information control center includes an alarm circuit, a data receiving module, a data processing module, a data storage module, an information sending module, and a wireless communication module.

8. The freight elevator overload detection feedback control system according to claim 7, characterized in that, The weight sensor (404) feeds back the detected data to the information control center. The information control center receives the information through the data receiving module, stores it through the data storage module, and feeds the data back to the data processing module of the information control center through the information sending module. After processing the data, the data processing module controls whether the alarm circuit works through the information control center and sends the data to the server terminal through the wireless communication module.

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